CN121238190A

CN121238190A - Battery monomer, battery, energy storage equipment and electric equipment

Info

Publication number: CN121238190A
Application number: CN202410850398.1A
Authority: CN
Inventors: 王利钦; 苏华圣; 林蹬华; 张小平; 邢承友
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-06-27
Filing date: 2024-06-27
Publication date: 2025-12-30
Also published as: WO2026000542A1

Abstract

This application discloses a battery cell, a battery, an energy storage device, and an electrical device. The battery cell includes an electrode assembly, a housing, electrode terminals, and a deformable member. The housing houses the electrode assembly and includes a first wall. The electrode terminals are electrically connected to the electrode assembly and are disposed on the first wall. The deformable member is configured to deform and contact the electrode terminals, thereby electrically connecting the first wall to the electrode terminals. The deformable member is made of a different material than the first wall and is fixedly connected to the first wall. A first connecting material is included at the fixed connection point between the deformable member and the first wall. The melting point of the first connecting material is lower than the melting point of the material of the deformable member and/or the melting point of the material of the first wall. The battery cell provided by this application effectively improves the connection reliability between the deformable member and the first wall, thereby effectively improving the operational reliability of the deformable member and the safety performance of the battery cell.

Description

Battery monomer, battery, energy storage equipment and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery, energy storage equipment and electric equipment.

Background

With the rapid development of new energy technology, new energy products such as energy storage devices, electric vehicles, etc. are widely used. For new energy products, battery technology is an important factor related to the development of the new energy products.

Batteries generally include battery cells, and how to improve the safety performance of the battery cells during the development of battery technology is a technical problem that needs to be solved in battery technology.

Disclosure of Invention

The embodiment of the application aims to provide a battery monomer, a battery, energy storage equipment and electric equipment, and aims to solve the technical problem that the safety performance of the battery monomer in the related technology is poor.

In order to solve the technical problems, the technical scheme adopted by the embodiment of the application is that a battery monomer is provided, which comprises:

An electrode assembly;

a case for accommodating the electrode assembly, the case including a first wall;

an electrode terminal for electrically connecting the electrode assembly, the electrode terminal being disposed on the first wall;

a deformable member configured to be deformable to be in contact with the electrode terminal so as to electrically connect the first wall body and the electrode terminal, the deformable member being made of a material different from that of the first wall body;

The deformable member is fixedly connected with the first wall body, and the fixed connection part of the deformable member and the first wall body comprises a first connecting material, wherein the melting point of the first connecting material is lower than that of the deformable member and/or that of the first wall body.

The battery monomer has the beneficial effects that the first connecting material is arranged at the fixed connection position of the deformable piece and the first wall body, and the melting point of the first connecting material is lower than the melting point of the material of the deformable piece and/or the melting point of the material of the first wall body, so that when the preset temperature is reached, the first connecting material is melted first, the deformable piece and the first wall body can be adhered together after the first connecting material is solidified, the deformable piece and the first wall body are fixedly connected, and compared with the connection mode of directly combining the melting position of the deformable piece and the melting position of the first wall body, the connection reliability of the deformable piece and the first wall body is effectively improved, the risk of gaps generated at the connection position of the deformable piece and the first wall body due to different materials is reduced, the working reliability of the deformable piece is effectively improved, the deformable piece can act in time under the condition that the battery monomer is overcharged, and the safety of the battery monomer is further effectively improved.

In some embodiments of the application, the first connection material is solder.

By adopting the technical scheme, the connection reliability of the deformable piece and the first wall body is further improved.

In some embodiments of the present application, the deformable member cooperates with the first wall to define a first connecting channel, and the first connecting material is received in the first connecting channel and adhered to an inner surface of the first connecting channel.

By adopting the technical scheme, the position of the first connecting material is effectively limited, and the attachment area of the first connecting material is effectively increased, so that the connection reliability of the deformable piece and the first wall body is further improved.

In some embodiments of the application, the first wall has a first connection surface and the deformable member has a second connection surface, the first connection material being connected between the first connection surface and the second connection surface, the first connection surface and/or the second connection surface being curved.

By adopting the technical scheme, the attachment area of the first connecting material is effectively increased, so that the connection reliability of the deformable piece and the first wall body is further improved.

In some embodiments of the application, the first wall has a first connection surface and the deformable member has a second connection surface, the first connection material being connected between the first connection surface and the second connection surface, the first connection surface and/or the second connection surface being roughened.

By adopting the technical scheme, the adhesive force of the first connecting material on the first connecting surface and the second connecting surface is effectively improved, so that the connection reliability of the deformable piece and the first wall body is further improved.

In some embodiments of the application, the first connecting material is disposed around the deformable member.

Through adopting above-mentioned technical scheme, can be through first connecting material along the circumference connection deformable piece and the first wall of deformable piece to form annular seal boundary between deformable piece and the first wall, not only effectively seal the gap between deformable piece and the first wall, can also make deformable piece atress become more even, thereby further improved the connection reliability of deformable piece and first wall.

In some embodiments of the present application, a first limiting structure is disposed between the first wall and the deformable member, and the first limiting structure is used to limit a relative position of the first wall and the deformable member in a direction perpendicular to a thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively restrict first wall and the relative position of deformable spare along the direction mutually perpendicular with the thickness direction of first wall to effectively reduced because of the deformable spare takes place the displacement and lead to the cracked risk of fixed connection department emergence of deformable spare and first wall, thereby further promoted the reliable performance of deformable spare, further promoted the free security performance of battery.

In some embodiments of the present application, the first limiting structure includes a first limiting portion, where the first limiting portion is disposed on the first wall and abuts against the deformable member in a direction perpendicular to a thickness direction of the first wall, so as to limit a relative position of the first wall and the deformable member in a direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively simplified first limit structure, be convenient for restrict first wall and the relative position of deformable member along the direction mutually perpendicular with the thickness direction of first wall.

In some embodiments of the present application, the first limiting portion protrudes from the first wall along a thickness direction of the first wall, and a protruding height of the first limiting portion from the first wall is 0.1mm to 0.6mm.

Through adopting above-mentioned technical scheme, not only effectively restrict the relative position of first wall and deformable spare along the direction mutually perpendicular with the thickness direction of first wall, still can improve the condition that leads to first spacing portion to occupy too much space because of the protrusion height of first spacing portion is too big to the free volume energy density of battery has effectively been improved.

In some embodiments of the present application, the first wall body is provided with a via hole penetrating through opposite sides of the first wall body in the thickness direction, and the deformable member is configured to be deformable to contact the electrode terminal through the via hole to electrically connect the first wall body with the electrode terminal.

By adopting the technical scheme, the deformable piece is convenient to contact with the electrode terminal.

In some embodiments of the application, the deformable member includes a connecting portion and a deformation portion, the connecting portion being configured to be fixedly connected with the first wall, the connecting portion being disposed around the deformation portion and the via, the deformation portion being configured to be deformable to contact the electrode terminal through the via to electrically connect the first wall with the electrode terminal.

In some embodiments of the present application, the electrode terminal is provided at the via hole with a protrusion protruding toward a direction approaching the deformable member, and the deformable member is configured to be deformable to contact the protrusion through the via hole to electrically connect the first wall with the electrode terminal.

In some embodiments of the application, the battery cell further comprises a first seal disposed between the first wall and the deformable member to sealingly connect the first wall and the deformable member.

By adopting the technical scheme, the sealing effect of the joint of the first wall body and the deformable piece is effectively improved, so that the working reliability of the deformable piece is further improved, and the safety performance of the battery cell is further improved.

In some embodiments of the application, a first seal is disposed around the aperture.

Through adopting above-mentioned technical scheme, effectively block the communication path between the internal environment of via hole and shell, further improved the sealed effect of the junction of first wall body and flexible spare to further promoted the reliable performance of the work of flexible spare, further promoted the free security performance of battery.

In some embodiments of the present application, the first wall and the deformable member cooperate to retain the first seal along a thickness direction of the first wall, and at least one of the first wall and the deformable member is provided with a second limiting structure for limiting movement of the first seal in a direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively reduced because of the first sealing member along the direction that looks vertically with the thickness direction of first wall takes place to shift and lead to sealed risk of inefficacy, further improved the sealed effect of the junction of first wall and flexible spare to further promoted the operational reliability of flexible spare, further promoted the free security performance of battery.

In some embodiments of the present application, the second limiting structure includes a second limiting portion disposed on the first wall and abutting against the first sealing member in a direction perpendicular to a thickness direction of the first wall to limit movement of the first sealing member in a direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively simplified second limit structure, be convenient for along the position of limiting first sealing member with the direction looks vertically of the thickness direction of first wall.

In some embodiments of the present application, the second limiting portion protrudes from the first wall along the thickness direction of the first wall, and the protruding height of the second limiting portion from the first wall is 0.1mm-0.6mm.

Through adopting above-mentioned technical scheme, not only effectively restrict the position of first sealing member, can also improve the condition that leads to second spacing portion to occupy too much space because of the protrusion height of second spacing portion is too big to the free volume energy density of battery has effectively been improved.

In some embodiments of the application, the first wall has a first sealing surface and the deformable member has a second sealing surface, the first sealing surface and the second sealing surface cooperatively sandwiching the first seal, the first seal having a compression ratio of 2% to 50% in a direction from the first sealing surface toward the second sealing surface.

By adopting the technical scheme, the sealing effect of the joint of the first wall body and the deformable piece is effectively improved, and the risk of cracking of the first sealing piece caused by overlarge pressure can be reduced, so that the reliability of the first sealing piece is effectively improved.

In some embodiments of the present application, the battery cell includes two deformable members and two electrode terminals of opposite polarities, the two electrode terminals being disposed to be insulated from the first wall, the two electrode terminals being disposed in one-to-one correspondence with the two deformable members.

By adopting the technical scheme, the safety performance of the battery monomer is further improved.

In some embodiments of the application, the battery cell further includes a first insulating member disposed between the electrode terminal and the first wall to insulate the electrode terminal from the first wall.

By adopting the technical scheme, the electrode terminal is convenient to be isolated from the first wall body in an insulating way.

In some embodiments of the present application, the first wall body is provided with a pressure release hole, the pressure release hole penetrates through two opposite sides of the first wall body along the thickness direction, the battery unit further comprises a pressure release mechanism, the pressure release mechanism is covered on the pressure release hole, the pressure release mechanism is made of different materials from the first wall body, the pressure release mechanism is fixedly connected with the first wall body, a second connecting material is included at the fixedly connected part of the pressure release mechanism and the first wall body, and the melting point of the second connecting material is lower than the melting point of the material of the pressure release mechanism and/or the melting point of the material of the first wall body.

Through adopting above-mentioned technical scheme, effectively improved the connection reliability of relief mechanism and first wall, reduced the risk that the junction that leads to relief mechanism and first wall because of the material is different produces the gap to effectively promoted relief mechanism's reliable performance, and then effectively promoted the free security performance of battery.

In some embodiments of the application, the second connection material is solder.

By adopting the technical scheme, the connection reliability of the pressure release mechanism and the first wall body is further improved.

In some embodiments of the present application, the pressure relief mechanism cooperates with the first wall to define a second connecting channel, and the second connecting material is received in the second connecting channel and attached to an inner surface of the second connecting channel.

Through adopting above-mentioned technical scheme, not only effectively restrict the position of second connection material, still effectively increased the area of attaching of second connection material to the reliability of being connected of relief mechanism and first wall has further been improved.

In some embodiments of the application, the first wall has a third connection surface and the pressure relief mechanism has a fourth connection surface, the second connection material is connected between the third connection surface and the fourth connection surface, and the third connection surface and/or the fourth connection surface is curved.

By adopting the technical scheme, the attaching area of the second connecting material is effectively increased, so that the connection reliability of the pressure release mechanism and the first wall body is further improved.

In some embodiments of the application, the first wall has a third connection face and the pressure relief mechanism has a fourth connection face, the second connection material being connected between the third connection face and the fourth connection face, the third connection face and/or the fourth connection face being roughened.

By adopting the technical scheme, the adhesive force of the second connecting material on the third connecting surface and the fourth connecting surface is effectively improved, so that the connection reliability of the pressure release mechanism and the first wall body is further improved.

In some embodiments of the application, the second connecting material is disposed around the pressure relief mechanism.

Through adopting above-mentioned technical scheme, can connect relief mechanism and first wall along relief mechanism's circumference through the second linking material to form annular seal boundary between relief mechanism and the first wall, not only effectively seal the gap between relief mechanism and the first wall, still can make relief mechanism atress become more even, thereby further improved the connection reliability of relief mechanism and first wall.

In some embodiments of the present application, a third limiting structure is disposed between the first wall and the pressure relief mechanism, and the third limiting structure is used to limit a relative position of the first wall and the pressure relief mechanism along a direction perpendicular to a thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively restrict the relative position of first wall and relief mechanism along the direction mutually perpendicular with the thickness direction of first wall to effectively reduced because of the relief mechanism takes place the displacement and lead to the cracked risk of fixed connection department emergence of relief mechanism and first wall, thereby further promoted the operational reliability of relief mechanism, further promoted the free security performance of battery.

In some embodiments of the present application, the third limiting structure includes a third limiting portion, where the third limiting portion is disposed on the first wall and abuts against the pressure release mechanism along a direction perpendicular to the thickness direction of the first wall, so as to limit a relative position of the first wall and the pressure release mechanism along the direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively simplified third limit structure, be convenient for restrict the relative position of first wall and pressure release mechanism along the direction mutually perpendicular with the thickness direction of first wall.

In some embodiments of the present application, the third limiting portion protrudes from the first wall along the thickness direction of the first wall, and the protruding height of the third limiting portion from the first wall is 0.1mm-0.6mm.

Through adopting above-mentioned technical scheme, not only effectively restrict the relative position of first wall and relief mechanism along the direction mutually perpendicular with the thickness direction of first wall, still can improve the condition that leads to the third spacing portion to occupy too much space because of the protrusion height of third spacing portion is too big to the free volume energy density of battery has effectively been improved.

In some embodiments of the application, the battery cell further comprises a second seal disposed between the first wall and the pressure relief mechanism to sealingly connect the first wall and the pressure relief mechanism.

Through adopting above-mentioned technical scheme, effectively improved the sealed effect of the junction of first wall and relief mechanism to further promoted the operational reliability of relief mechanism, further promoted the free security performance of battery.

In some embodiments of the application, a second seal is disposed around the pressure relief vent.

Through adopting above-mentioned technical scheme, effectively block the communication path between the internal environment of pressure release hole and shell, further improved the sealed effect of the junction of first wall and pressure release mechanism to further promoted pressure release mechanism's operational reliability, further promoted the free security performance of battery.

In some embodiments of the present application, the first wall and the pressure release mechanism cooperate to clamp the second sealing member along a thickness direction of the first wall, and at least one of the first wall and the pressure release mechanism is provided with a fourth limiting structure for limiting movement of the second sealing member along a direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively reduced because of the second sealing member along the direction that looks vertically with the thickness direction of first wall takes place to shift and lead to sealed risk of inefficacy, further improved the sealed effect of the junction of first wall and relief mechanism to further promoted the operational reliability of relief mechanism, further promoted the free security performance of battery.

In some embodiments of the present application, the fourth limiting structure includes a fourth limiting portion disposed on the first wall and abutting against the second sealing member in a direction perpendicular to the thickness direction of the first wall to limit movement of the second sealing member in a direction perpendicular to the thickness direction of the first wall.

Through adopting above-mentioned technical scheme, effectively simplified fourth limit structure, be convenient for along the position restriction second sealing member with the direction looks vertically of the thickness direction of first wall.

In some embodiments of the present application, the fourth limiting portion is protruding from the first wall along the thickness direction of the first wall, and the protruding height of the fourth limiting portion from the first wall is 0.1mm-0.6mm.

Through adopting above-mentioned technical scheme, not only effectively restrict the position of second sealing member, can also improve the condition that leads to fourth spacing portion to occupy too much space because of the protrusion height of fourth spacing portion is too big to the free volume energy density of battery has effectively been improved.

In some embodiments of the application, the first wall has a third sealing surface and the pressure relief mechanism has a fourth sealing surface, the third sealing surface cooperating with the fourth sealing surface to retain the second seal, the second seal having a compression ratio of 2% to 50% in a direction from the third sealing surface toward the fourth sealing surface.

By adopting the technical scheme, the sealing effect of the joint of the first wall body and the pressure relief mechanism is effectively improved, the risk of cracking of the second sealing element caused by overlarge pressure can be reduced, and the reliability of the second sealing element is effectively improved.

In some embodiments of the application, the pressure relief mechanism is an aluminum alloy article.

Through adopting above-mentioned technical scheme, be convenient for release mechanism open and release battery free internal pressure under the free internal pressure of battery reaches the circumstances of threshold value to further improved battery free security performance.

In some embodiments of the present application, the battery cell further includes a protection sheet disposed on a side of the first wall facing away from the electrode assembly and covering the pressure relief hole, and the pressure relief mechanism is disposed on a side of the first wall facing toward the electrode assembly.

By adopting the technical scheme, foreign matters such as electrolyte and dust can be prevented from entering the pressure relief hole, and adverse effects of the foreign matters on the pressure relief mechanism are reduced, so that the safety performance of the battery cell is further improved.

In some embodiments of the application, the protective sheet is adhered to the first wall.

By adopting the technical scheme, the protection sheet is convenient to fix on the first wall body.

In some embodiments of the present application, the housing includes a shell and a cover body covering the shell, the cover body forms a first wall body, the first wall body is connected with the shell, and a material of the first wall body is the same as a material of the shell.

Through adopting above-mentioned technical scheme, because the material of first wall is the same with the material of casing, the material characteristic of first wall is also the same with the material characteristic of casing, has effectively reduced the material state change difference that first wall and casing produced under the influence of environmental factors such as temperature, atmospheric pressure to effectively improved the connection reliability of first wall and casing, effectively reduced the risk that the junction of first wall and casing produced the gap, and then further promoted the free security performance of battery.

In some embodiments of the application, the housing is welded to the first wall.

By adopting the technical scheme, as the material of the first wall body is the same as that of the shell, in the welding process, the melting part of the first wall body can be better combined with the melting part of the shell, so that the connection reliability of the first wall body and the shell is further improved.

In some embodiments of the application, the deformable member is an aluminum member and the first wall is a steel member.

By adopting the technical scheme, the connection reliability of the deformable piece and the first wall body is improved, and the structural strength of the first wall body is also improved.

In some embodiments of the present application, the battery cell further includes a second insulating member disposed on a side of the first wall facing the electrode assembly, the second insulating member including an insulating body and a first blocking portion connected to the insulating body, the first blocking portion being disposed opposite to the deformable member.

By adopting the technical scheme, the protection effect on the deformable member is effectively achieved, and the risk of damage caused by interference between the deformable member and other components in the battery cell is effectively reduced.

In some embodiments of the application, the first baffle portion is provided with a first gas hole for gas to flow from the electrode assembly to the deformable member.

Through adopting above-mentioned technical scheme, under the condition that battery monomer appears the phenomenon of overcharging, the produced gas of electrode assembly accessible first gas port reaches the deformable spare and promotes the direction action of deformable spare towards electrode terminal to make deformable spare and electrode terminal contact each other, thereby cut off the free charge-discharge circuit of battery, further improved the free security performance of battery.

The embodiment of the application also provides a battery, which comprises the battery cell of any embodiment.

The battery provided by the embodiment of the application has the beneficial effects that the battery provided by the embodiment of the application effectively improves the safety performance of the battery due to the adoption of the battery monomer of any one embodiment.

The embodiment of the application also provides energy storage equipment which comprises the battery.

The energy storage device provided by the embodiment of the application has the beneficial effects that the safety performance of the energy storage device is effectively improved due to the adoption of the battery of any one embodiment.

The embodiment of the application also provides electric equipment, which comprises the battery.

The electric equipment provided by the embodiment of the application has the beneficial effects that the safety performance of the electric equipment is effectively improved due to the adoption of the battery of any one embodiment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or exemplary technical descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;

fig. 3 is an exploded view of a battery according to an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG. 5 is a schematic top view of the battery cell shown in FIG. 4;

FIG. 6 is a schematic cross-sectional view of the battery cell shown in FIG. 5 along the line A-A;

Fig. 7 is an enlarged schematic view of the structure of the battery cell shown in fig. 6 at B;

fig. 8 is an enlarged schematic view of a structure of the battery cell shown in fig. 7 at D;

Fig. 9 is an enlarged schematic view of the structure of the battery cell shown in fig. 6 at C;

Fig. 10 is an enlarged schematic view of the structure of the battery cell shown in fig. 9 at E;

Fig. 11 is a schematic view of an exploded structure of the first wall, the deformable member, and the second insulating member in the battery cell shown in fig. 6.

Reference numerals illustrate:

1000. A vehicle;

2000. An energy storage device;

100. A battery;

10. the box body, 11, the first part, 12, the second part;

20. a battery cell;

21. The housing, 211, a first wall body, 2111, a first connecting surface, 2112, a via hole, 2113, a first limiting structure, 21131, a first limiting part, 2114, a second limiting structure, 21141, a second limiting part, 2115, a first sealing surface, 2116, a pressure relief hole, 2117, a third connecting surface, 2118, a third limiting structure, 21181, a third limiting part, 2119, a fourth limiting structure, 21191, a fourth limiting part, 21120, a third sealing surface, 212, a cover body, 213, a housing, 2131, a second wall body, 2132, a third wall body;

22. an electrode assembly;

23. electrode terminal, 231, terminal body, 2311, projection, 232, connector;

24. 241, first connecting grooves;

25. deformable member 251, second connecting surface 252, connecting portion 253, deformation portion 254, second sealing surface;

26. 261, second connecting grooves;

27a, a pressure relief mechanism, 271a, a fourth connecting surface, 272a, a fourth sealing surface;

27b, a protective sheet;

28a, a first insulating member, 28b, a second insulating member, 281b, an insulating main body, 282b, a first blocking portion, 2821b, a first air hole, 283b, a second blocking portion, 2831b, and a second air hole;

29a, a first seal, 29b, a second seal;

200. A controller;

300. a motor;

400. And a battery compartment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings, are for convenience of description only, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the application, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art as appropriate. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings are merely illustrative and should not be construed as limiting the application in any way.

The battery cell, as a minimum unit constituting the battery, generally includes a case, an electrode assembly, and electrode terminals. The electrode assembly is disposed in the case, and the electrode terminals are disposed on a wall of the case. The electrode terminals are electrically connected with the electrode assembly to input or output electric energy of the battery cells.

In the practical use process, the battery cell is easy to generate overcharge, and thermal runaway can be caused when the battery cell is severe, so that a deformable piece is required to be arranged on the battery cell. The deformable member is generally in sealing connection with the housing, and under the condition that the battery cell is overcharged, the electrode assembly can generate more gas, and as the gas increases, the internal pressure of the battery cell increases, and under the condition that the internal pressure of the battery cell reaches a threshold value, the deformable member can deform under the action of the pressure and act in a direction close to the electrode terminal until the deformable member is in contact with the electrode terminal, so that the electrode terminal is electrically connected with the housing, and a charging and discharging loop of the battery cell is cut off, so that the risk of further deterioration of the overcharged phenomenon of the battery cell is reduced.

In the related art, it is common to heat a portion of the deformable member and a portion of the housing to melt and bond the melted portion of the deformable member and the melted portion of the housing, thereby achieving the connection of the deformable member and the housing. However, in order to increase the volumetric energy density of the battery cell, it is studied to provide the case of the battery cell to be made of steel material, and in order to enable the deformable member to act in the direction of the electrode terminal when the internal pressure of the battery cell reaches a threshold value, the deformable member is generally made of aluminum material. Because the material of the deformable member is different from the material of the shell, the material characteristics of the deformable member are different from the material characteristics of the shell, after the fusion part of the deformable member is combined with the fusion part of the shell and solidified, gaps are easily generated at the joint of the deformable member and the shell, so that enough internal and external pressure differences cannot be generated at the deformable member in time, the deformable member cannot be deformed in time and is in contact with an electrode terminal, namely a charging and discharging loop of a battery monomer cannot be cut off in time, the overcharging phenomenon of the battery monomer is further deteriorated, even thermal runaway is caused, and the safety performance of the battery monomer is not improved.

In order to improve the safety performance of the battery monomer, the first connecting material is arranged at the fixed connection position of the deformable piece and the first wall body, and the melting point of the first connecting material is lower than the melting point of the material of the deformable piece and/or the melting point of the material of the first wall body, so when the preset temperature is reached, the first connecting material is melted first, the deformable piece and the first wall body can be adhered together after the first connecting material is solidified, so that the deformable piece and the first wall body are fixedly connected, the connection reliability of the deformable piece and the first wall body is effectively improved, the risk of gaps generated at the connection position of the deformable piece and the first wall body due to different materials is reduced, the working reliability of the deformable piece is effectively improved, the deformable piece can act in time under the condition that the battery monomer is overcharged, and the safety performance of the battery monomer is effectively improved.

The embodiment of the application discloses a battery monomer, a battery, energy storage equipment using the battery as a power supply and electric equipment. The energy storage device can be used in industrial and commercial energy storage scenes such as small-scale business, medium-scale business, large-scale business, optical storage and charging stations, medium-scale micro-grid and the like, wind-light energy storage power stations, power grid energy storage power stations and large-scale micro-grid power stations for storing and releasing electric energy. The powered device may be, but is not limited to, a vehicle, a cell phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an energy storage device 2000 according to an embodiment of the application. The energy storage device 2000 is a device for storing electric energy, and the energy storage device 2000 may be, but is not limited to, an energy storage container or an energy storage electric cabinet, etc. The energy storage device 2000 may include a battery compartment 400 and a battery 100 disposed in the battery compartment 400, and the energy storage device 2000 may further include an electronic control module for controlling charge and discharge of the battery 100 and monitoring an operation state of the battery 100, for example, the electronic control module is used for monitoring parameters such as temperature, voltage, current, etc. of the battery 100.

Referring to fig. 3, fig. 3 is an exploded view of a battery 100 according to an embodiment of the application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-shaped structure, the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 together define a containing space, the first part 11 and the second part 12 may be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In some embodiments, the tank 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the tank 10 may become at least a portion of the floor of the vehicle 1000, or a portion of the tank 10 may become at least a portion of the cross member and the side member of the vehicle 1000.

In other embodiments, the housing 10 may be part of a support structure for the energy storage device 2000. For example, a portion of the housing 10 may become at least a portion of a stand for the energy storage device 2000.

Of course, in some embodiments, the battery 100 may not include the case 10, but may be formed integrally by a necessary fixing structure to be assembled into the energy storage device 2000 or the electric device by electrically connecting the plurality of battery cells 20.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 20 is accommodated in the box 10. Of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 10. The battery 100 may also include other functional components, for example, the battery 100 may also include a buss bar for making electrical connection between the plurality of battery cells 20.

Each of the battery cells 20 may be a secondary battery cell or a primary battery cell, wherein the secondary battery cell refers to the battery cell 20 that can activate the active material by charging after the battery cell 20 discharges, the primary battery cell refers to the battery cell 20 that cannot activate the active material by charging after the battery cell 20 is exhausted, and the battery cell 20 may also be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead battery cell, or the like, but is not limited thereto. The battery cell 20 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a polygonal battery cell, such as a hexagonal battery cell, etc., and the present application is not particularly limited.

In order to explain the technical scheme provided by the application, the following is a detailed description with reference to the specific drawings and embodiments.

Referring to fig. 4 to 8, an embodiment of the present application provides a battery cell 20 including an electrode assembly 22, a case 21, an electrode terminal 23, a deformable member 25 and a first connecting material 24. The case 21 is for accommodating the electrode assembly 22, and the case 21 includes a first wall 211. The electrode terminal 23 is used for electrically connecting the electrode assembly 22, and the electrode terminal 23 is disposed on the first wall 211. The deformable member 25 is configured to be deformable to be in contact with the electrode terminal 23 so that the first wall 211 is electrically connected to the electrode terminal 23, and the material of the deformable member 25 is different from the material of the first wall 211. The deformable member 25 is fixedly connected to the first wall 211, and a fixed connection portion between the deformable member 25 and the first wall 211 includes a first connecting material 24, where a melting point of the first connecting material 24 is lower than a melting point of a material of the deformable member 25 and/or a melting point of a material of the first wall 211.

The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. The battery cell 20 may include one or more electrode assemblies 22. The main body portion of the electrode assembly 22 is made of a positive electrode sheet, a negative electrode sheet and a separator using a winding process or a lamination process. The positive plates and the negative plates can be respectively arranged in a plurality, the positive plates and the negative plates are alternately stacked, and the separator is arranged between the adjacent positive plates and negative plates to insulate and separate the positive plates from the negative plates. The shape of the electrode assembly 22 may be, but is not limited to, cylindrical, flat, polygonal, etc. In some embodiments, the electrode assembly 22 may further include tabs including a positive tab connected to the positive tab and a negative tab connected to the negative tab to draw current from the electrode assembly 22 or to input current to the electrode assembly 22.

In some embodiments, a plurality of positive plates can be arranged, the negative plates are folded to form a plurality of folded sections which are arranged in a stacked manner, and one positive plate is clamped between adjacent folded sections.

In other embodiments, a plurality of negative electrode sheets may be provided, and the positive electrode sheet is folded to form a plurality of folded sections arranged in a stacked manner, and one negative electrode sheet is sandwiched between adjacent folded sections.

In still other embodiments, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement, the plurality of folded sections of the positive electrode sheet being alternately stacked with the plurality of folded sections of the negative electrode sheet.

In some embodiments, the separator may be provided in plurality, disposed between any adjacent positive or negative electrode sheets, respectively.

In other embodiments, the separator may be disposed continuously, by being folded or rolled, between any adjacent positive or negative electrode sheets.

In some embodiments, the battery cell 20 further includes an electrolyte that serves to conduct ions between the positive and negative electrode sheets, which may be, but is not limited to, a liquid electrolyte, a gel electrolyte, a solid electrolyte, and the like.

The case 21 is a member for providing an internal environment of the battery cell 20, which may be used to house the electrode assembly 22, the deformable member 25, the electrolyte, and other functional components.

In some embodiments, the housing 21 may include a case 213 and a cover 212, wherein the case 213 has a cavity, an opening may be provided on the case 213, the cavity communicates with an external environment of the battery cell 20 through the opening, and the internal environment of the battery cell 20 is formed by covering the cover 212 on the opening to isolate the cavity of the case 213 from the external environment of the battery cell 20. Specifically, the housing 213 and the cover 212 may form a common connection surface before other components are put into the housing, and when the interior of the housing 213 needs to be sealed, the cover 212 is covered on the opening of the housing 213. The shape of the case 213 may be determined according to the specific shape and size of the electrode assembly 22, and the shape of the case 213 may be, but is not limited to, a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, etc. The shape of the cover 212 may be adapted to the shape of the opening of the housing 213, and the shape of the cover 212 may be, but is not limited to, rectangular parallelepiped, cylindrical, hexagonal prism, etc.

The first wall 211 may be any wall of the housing 21, for example, the first wall 211 may be a cover 212, and for example, the first wall 211 may be a bottom wall of the housing 213, that is, a wall of the housing 213 opposite to the opening. In some embodiments, the cover 212 forms a first wall 211, the housing 213 includes a second wall 2131 and a third wall 2132, the third wall 2132 is disposed around the second wall 2131 and connected to a periphery of the second wall 2131 to define the cavity, the first wall 211 covers an opening of the housing 213, and the first wall 211 is disposed opposite to the second wall 2131.

The deformable member 25 is a member for shorting the positive electrode and the negative electrode of the battery cell 20 in the case where the overcharge phenomenon occurs in the battery cell 20. When the battery cell 20 is overcharged, the electrode assembly 22 generates a large amount of gas, the internal pressure of the battery cell 20 increases as the gas increases, and when the internal pressure of the battery cell 20 reaches a threshold value, the deformable member 25 deforms and moves in a direction toward the electrode terminal 23 due to the pressure until the deformable member 25 contacts the electrode terminal 23 to electrically connect the electrode terminal 23 to the case 21, thereby cutting off the charge/discharge circuit of the battery cell 20.

The material of the deformable member 25 is different from that of the first wall 211, which means that the deformable member 25 and the first wall 211 are made of different materials, for example, the deformable member 25 is made of an aluminum alloy, the first wall 211 is made of a steel material, and for example, the deformable member 25 is made of a steel material, and the first wall 211 is made of an aluminum alloy.

The electrode terminals 23 are members electrically connected to the electrode assembly 22 for outputting electric power of the battery cells 20 or inputting electric power to the battery cells 20. The electrode terminal 23 is disposed on the first wall 211, a portion of the electrode terminal 23 extends into the internal environment of the battery cell 20 and is directly or indirectly connected to the tab of the electrode assembly 22, and another portion of the electrode terminal 23 is exposed to the external environment of the battery cell 20 and is connected to the bus bar, the sampling device, and the like.

In some embodiments, in order to enhance the overcurrent capability of the electrode terminal 23, the projected shape of the electrode terminal 23 in the thickness direction of the first wall 211 is substantially square, which may increase the overcurrent area of the electrode terminal 23, thereby enhancing the overcurrent capability of the electrode terminal 23.

Of course, in other embodiments, the projected shape of the electrode terminal 23 along the thickness direction of the first wall body 211 may also take other shape structures, such as a circle or the like.

The first connecting material 24 is at least part of the material constituting the fixed connection of the first wall 211 and the deformable member 25. In some embodiments, the first connecting material 24 constitutes all of the fixed connection of the first wall 211 and the deformable member 25, in other words, the first connecting material 24 is connected between the first wall 211 and the deformable member 25. The fact that the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and/or the melting point of the material of the first wall body 211 means that the first connecting material 24 will melt but the first wall body 211 and/or the deformable member 25 will not melt when the melting point temperature of the first connecting material 24 is reached. As an example, the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and the melting point of the material of the first wall 211. As an example, the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and is greater than or equal to the melting point of the material of the first wall 211. As an example, the melting point of the first connecting material 24 is lower than the melting point of the material of the first wall body 211 and is greater than or equal to the melting point of the material of the deformable member 25.

Taking the melting point of the first connecting material 24 being lower than the melting point of the material of the deformable member 25 and the melting point of the material of the first wall 211 as an example, when connecting, the first connecting material 24 is heated to the melting point temperature by adopting a heating device, so that the first connecting material 24 is melted, since the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and the melting point of the material of the first wall 211, at this time, the deformable member 25 and the first wall 211 are not melted, the melted first connecting material 24 is adhered between the deformable member 25 and the first wall 211, and after the first connecting material 24 is cooled and solidified, the first wall 211 and the deformable member 25 are fixedly connected.

According to the battery monomer 20 provided by the embodiment of the application, the first connecting material 24 is arranged at the fixed connection position of the deformable member 25 and the first wall body 211, and as the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and/or the melting point of the material of the first wall body 211, when the preset temperature is reached, the first connecting material 24 is melted first, after the first connecting material 24 is solidified, the deformable member 25 and the first wall body 211 can be adhered together, so that the fixed connection of the deformable member 25 and the first wall body 211 is realized, and compared with the connection mode of directly combining the melting position of the deformable member 25 and the melting position of the first wall body 211, the connection reliability of the deformable member 25 and the first wall body 211 is effectively improved, the risk of gaps generated at the connection position of the deformable member 25 and the first wall body 211 due to different materials is reduced, and therefore the working reliability of the deformable member 25 is effectively improved, the battery monomer 20 can be cut off under the condition that the battery monomer 20 is overcharged, and the safety circuit of the battery monomer 20 is effectively and safely charged.

In some embodiments, the first wall 211 is provided with a via hole 2112, and the via hole 2112 penetrates through opposite sides of the first wall 211 in the thickness direction. When the internal pressure of the battery cell 20 reaches the threshold value, the deformable member 25 deforms due to the pressure and moves in a direction approaching the electrode terminal 23 through the via hole 2112 until the deformable member 25 contacts the electrode terminal 23, so that the electrode terminal 23 is electrically connected to the case 21, thereby cutting off the charge/discharge circuit of the battery cell 20.

In some embodiments, the first wall 211 is provided with an electrode lead-out hole. The electrode terminal 23 includes a terminal body 231 and a connecting member 232. The terminal body 231 is disposed on a side of the first wall 211 facing away from the electrode assembly 22, and the terminal body 231 is used for connecting with a bus bar, a sampling device, and the like. The connection member 232 is inserted through the electrode lead-out hole and is used to connect the terminal body 231 and the first wall body 211, and the connection member 232 is also used to electrically connect the electrode assembly 22 so that the electrode assembly 22 is electrically connected with the terminal body 231. At least a part of the terminal body 231 is disposed opposite to the via hole 2112, and when the internal pressure of the battery cell 20 reaches a threshold value, the deformable member 25 deforms by the pressure and moves in a direction approaching the terminal body 231 through the via hole 2112, so that the deformation portion 253 contacts the terminal body 231. The connection manner of the connection member 232 to connect the first wall body 211 and the terminal body 231 may be, but is not limited to, riveting, screwing, etc.

Of course, in other embodiments, the electrode terminal 23 may be an integrally formed member, for example, the electrode terminal 23 may be in a columnar structure and fixed to the electrode lead-out hole.

In some embodiments, the deformable member 25 may include a connection portion 252 and a deformation portion 253, where the connection portion 252 is fixedly connected to the first wall 211, in other words, the first connecting material 24 is connected between the first wall 211 and the connection portion 252, and the connection portion 252 is disposed around the deformation portion 253 and the via hole 2112. The deformed portion 253 is a portion for contacting the electrode terminal 23, and the deformed portion 253 is connected to the inner ring side of the connecting portion 252. When the internal pressure of the battery cell 20 reaches the threshold value, the deformation portion 253 deforms due to the pressure and moves in a direction approaching the electrode terminal 23 through the via hole 2112 until the deformation portion 253 contacts the electrode terminal 23, so that the electrode terminal 23 is electrically connected to the case 21, and the charge/discharge circuit of the battery cell 20 is cut off.

As an example, the connecting portion 252 and the deformation portion 253 may be integrally formed, for example, the deformable member 25 may be integrally formed by a pressing process, the outer peripheral portion of the deformable member 25 may constitute the connecting portion 252, and the middle portion of the deformable member 25 may constitute the deformation portion 253.

As an example, the connection portion 252 and the deformation portion 253 may be integrally connected to each other after being molded, for example, the connection portion 252 and the deformation portion 253 may be welded to each other after being molded, respectively.

In some embodiments of the present application, the first connecting material 24 is solder.

The solder may be, but is not limited to, copper-based solder, silver-based solder, aluminum-based solder, nickel-based solder, tin-based solder, and the like.

By adopting the above technical scheme, the connection reliability of the deformable member 25 and the first wall body 211 is further improved.

Of course, in other embodiments, the first connecting material 24 may be a metallic material.

In some embodiments of the present application, referring to fig. 8, the deformable member 25 and the first wall 211 cooperate to define a first connecting slot 241, and the first connecting material 24 is contained in the first connecting slot 241 and adhered to an inner surface of the first connecting slot 241.

In some embodiments, the first connection groove 241 has at least a first groove bottom surface and two first groove side surfaces provided separately on opposite sides of the first groove bottom surface, the first groove bottom surface and the two first groove side surfaces defining an inner space of the first connection groove 241, a portion of the first connection material 24 being attached to the first groove bottom surface, another portion of the first connection material 24 being attached to one first groove side surface, and yet another portion of the first connection material 24 being attached to the other first groove side surface.

By adopting the above technical scheme, not only the position of the first connecting material 24 is effectively limited, but also the attachment area of the first connecting material 24 is effectively increased, thereby further improving the connection reliability of the deformable member 25 and the first wall body 211.

In some embodiments of the present application, the first wall 211 has a first connection surface 2111 and the deformable member 25 has a second connection surface 251, with the first connection material 24 being connected between the first connection surface 2111 and the second connection surface 251.

In some embodiments, first connection surface 2111 cooperates with second connection surface 251 to define first connection channel 241 as described above.

As an example, the first connection surface 2111 may constitute a first groove bottom surface and one first groove side surface, and the second connection surface 251 may constitute the other first groove side surface.

As an example, the first connection surface 2111 may constitute one first groove side surface, and the second connection surface 251 may constitute the first groove bottom surface and the other first groove side surface.

As an example, it may be that the first connection surface 2111 forms a part of the first groove bottom surface and one first groove side surface, and the second connection surface 251 forms another part of the first groove bottom surface and the other first groove side surface.

In some embodiments of the application, the first connection surface 2111 is curved.

In other embodiments of the present application, the second connection surface 251 is a curved surface.

In still other embodiments of the present application, both the first connection surface 2111 and the second connection surface 251 are curved.

The curved surface may be, but is not limited to, a curved surface, a chamfer surface, an irregular surface, and the like.

By adopting the above technical scheme, the attachment area of the first connecting material 24 is effectively increased, so that the connection reliability of the deformable member 25 and the first wall body 211 is further improved.

In some embodiments of the application, the first connection surface 2111 is a rough surface.

In other embodiments of the present application, the second connection face 251 is a roughened face.

In still other embodiments of the present application, both the first connection surface 2111 and the second connection surface 251 are roughened surfaces.

The rough surface refers to a surface structure composed of a plurality of fine concave-convex bodies, such as a frosted surface. The first connection surface 2111 and the second connection surface 251 may be polished to a rough surface using a polishing process, for example, the first connection surface 2111 and the second connection surface 251 may be polished using a grinding wheel such that the first connection surface 2111 and the second connection surface 251 form a frosted surface.

By adopting the technical scheme, the adhesive force of the first connecting material 24 on the first connecting surface 2111 and the second connecting surface 251 is effectively improved, so that the connection reliability of the deformable member 25 and the first wall body 211 is further improved.

In some embodiments of the present application, the first connecting material 24 is disposed around the deformable member 25.

In other words, the first connection material 24 has an annular structure, and accordingly, the first connection surface 2111 and the second connection surface 251 are both annular surfaces, wherein the first connection surface 2111 is disposed around the deformable member 25, and the second connection surface 251 is at least a portion of the outer peripheral surface of the deformable member 25.

Through adopting above-mentioned technical scheme, can be through first connecting material 24 along the circumference connection deformable piece 25 and the first wall 211 of deformable piece 25 to form annular seal boundary between deformable piece 25 and the first wall 211, not only effectively seal the gap between deformable piece 25 and the first wall 211, can also make deformable piece 25 atress become more even, thereby further improved the connection reliability of deformable piece 25 and first wall 211.

In some embodiments of the present application, referring to fig. 8, a first limiting structure 2113 is disposed between the first wall 211 and the deformable member 25, and the first limiting structure 2113 is used for limiting the relative positions of the first wall 211 and the deformable member 25 along a direction perpendicular to the thickness direction of the first wall 211.

The first stopper structure 2113 is a structure for restricting the relative positions of the first wall body 211 and the deformable member 25 in a direction perpendicular to the thickness direction of the first wall body 211, that is, the first wall body 211 and the deformable member 25 are relatively fixed in the direction perpendicular to the thickness direction of the first wall body 211.

As an example, the first limiting structure 2113 is used to limit the relative positions of the first wall 211 and the deformable member 25 in the width direction of the first wall 211.

As an example, the first limiting structure 2113 is used to limit the relative positions of the first wall 211 and the deformable member 25 along the length direction of the first wall 211.

As an example, the first limiting structure 2113 is used to limit any relative position of the first wall 211 and the deformable member 25 in a plane direction perpendicular to the thickness direction of the first wall 211.

The first stop feature 2113 may be, but is not limited to, a male-female mating feature, a latch feature, etc.

Through adopting above-mentioned technical scheme, effectively restrict the relative position of first wall 211 and deformable spare 25 along the direction mutually perpendicular with the thickness direction of first wall 211 to effectively reduced because of the deformable spare 25 takes place the displacement and lead to the fracture risk to take place with the fixed junction of first wall 211 deformable spare 25, thereby further promoted the operational reliability of deformable spare 25, further promoted the security performance of battery monomer 20.

In some embodiments of the present application, referring to fig. 8, the first limiting structure 2113 includes a first limiting portion 21131, where the first limiting portion 21131 is disposed on the first wall 211 and abuts against the deformable member 25 along a direction perpendicular to a thickness direction of the first wall 211, so as to limit a relative position of the first wall 211 and the deformable member 25 along a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the first wall 211 and the deformable member 25 are abutted against each other in the thickness direction of the first wall 211, the first stopper 21131 is provided at a side of the first wall 211 facing the electrode assembly 22, the first stopper 21131 is provided protruding from the first wall 211 in a direction toward the electrode assembly 22 in the thickness direction of the first wall 211, and the first stopper 21131 abuts against a side of the deformable member 25 in a direction perpendicular to the thickness direction of the first wall 211 to restrict the relative positions of the first wall 211 and the deformable member 25 in a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the deformable member 25 may include a connection portion 252 and a deformation portion 253, the connection portion 252 being disposed around the deformation portion 253, the deformation portion 253 being connected to an inner ring side of the connection portion 252. The first limiting portion 21131 has an annular structure, and the first limiting portion 21131 is disposed around the deformable member 25 and abuts against the outer ring side of the connecting portion 252 to limit the relative position of the first wall 211 and the deformable member 25 in a direction perpendicular to the thickness direction of the first wall 211.

The first limiting portion 21131 and the first wall 211 may be integrally formed, for example, the first limiting portion 21131 and the first wall 211 may be integrally formed by a stamping process. The first limiting portion 21131 and the first wall 211 may be integrally formed after being separately formed, for example, the first limiting portion 21131 and the first wall 211 may be integrally welded.

By adopting the above technical scheme, the first limiting structure 2113 is effectively simplified, so that the relative position of the first wall 211 and the deformable member 25 along the direction perpendicular to the thickness direction of the first wall 211 is conveniently limited.

In some embodiments of the present application, referring to fig. 8, a protrusion height H1 of the first limiting portion 21131 from the first wall 211 is 0.1mm to 0.6mm.

The protrusion height H1 of the first stopper portion 21131 from the first wall 211 refers to the dimension of the first stopper portion 21131 in the thickness direction of the first wall 211. The protrusion height H1 of the first limiting portion 21131 from the first wall 211 may be selected and set within the above range according to practical application requirements, and may specifically be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

By adopting the above technical scheme, the relative position of the first wall body 211 and the deformable member 25 along the direction perpendicular to the thickness direction of the first wall body 211 is effectively limited, and the situation that the first limiting portion 21131 occupies too much space due to the overlarge protruding height of the first limiting portion 21131 can be improved, so that the volume energy density of the battery cell 20 is effectively improved.

In some embodiments of the present application, referring to fig. 7, the electrode terminal 23 is provided with a protrusion 2311 protruding toward a direction approaching the deformable member 25 at the via hole 2112, and the deformable member 25 is configured to be deformable to contact the protrusion 2311 through the via hole 2112 so that the first wall 211 is electrically connected with the electrode terminal 23.

In some embodiments, the electrode terminal 23 includes a terminal body 231, and a portion of the terminal body 231 facing the via hole 2112 is convexly disposed toward a direction approaching the deformable member 25 to form the above-described protrusion 2311. At least a portion of the protrusion 2311 may extend into the through hole 2112 to shorten the distance between the terminal body 231 and the deformable member 25 in the thickness direction of the first wall 211, and the protrusion 2311 may or may not pass through the through hole 2112.

By adopting the above-described technical scheme, the deformable member 25 is facilitated to be in contact with the electrode terminal 23.

In some embodiments of the present application, referring to fig. 7 and 8, the battery cell 20 further includes a first sealing member 29a, wherein the first sealing member 29a is disposed between the first wall 211 and the deformable member 25 to seal and connect the first wall 211 and the deformable member 25.

The first seal 29a is a member for closing the gap between the first wall 211 and the deformable member 25. The first seal 29a may be made of a flexible material, which may be, but is not limited to, rubber, silicone, etc. The first wall 211 presses the first seal 29a in cooperation with the deformable member 25 to compressively deform the first seal 29a, thereby closing the gap between the first wall 211 and the deformable member 25.

By adopting the technical scheme, the sealing effect of the joint of the first wall body 211 and the deformable member 25 is effectively improved, so that the working reliability of the deformable member 25 is further improved, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the application, a first seal 29a is disposed around the via 2112.

In some embodiments, the deformable member 25 may include a connection portion 252 and a deformation portion 253, the connection portion 252 being disposed around the deformation portion 253, the deformation portion 253 being connected to an inner ring side of the connection portion 252. The first seal 29a is disposed between the connection portion 252 and the first wall 211, and the first seal 29a is disposed around the via hole 2112.

As an example, the connection portion 252 and the first seal 29a are both in a circular ring structure, and the connection portion 252 is disposed coaxially with the first seal 29 a.

Of course, in other embodiments, the connection portion 252 and the first seal member 29a may have a square ring structure, an elliptical ring structure, or the like.

Through adopting above-mentioned technical scheme, effectively block the communication path between the internal environment of via hole 2112 and shell 21, further improved the sealed effect of the junction of first wall 211 and deformable spare 25 to further promoted the reliable performance of the work of deformable spare 25, further promoted the security performance of battery monomer 20.

In some embodiments of the present application, referring to fig. 8, the first wall 211 and the deformable member 25 cooperate to clamp the first sealing member 29a along the thickness direction of the first wall 211, at least one of the first wall 211 and the deformable member 25 is provided with a second limiting structure 2114, and the second limiting structure 2114 is used to limit the movement of the first sealing member 29a along a direction perpendicular to the thickness direction of the first wall 211.

The second stopper 2114 is a structure for restricting movement of the first seal 29a in a direction perpendicular to the thickness direction of the first wall 211. The second limiting structure 2114 may be disposed on the first wall 211, or may be disposed on the deformable member 25, or a portion of the second limiting structure 2114 may be disposed on the first wall 211, and another portion of the second limiting structure 2114 may be disposed on the deformable member 25.

As an example, the second stopper 2114 is provided for restricting the movement of the first seal 29a in the width direction of the first wall 211.

As an example, the second limiting structure 2114 is used to limit the movement of the first seal 29a along the length direction of the first wall 211.

As an example, the second stopper 2114 is provided for restricting the movement of the first seal 29a in a plane direction perpendicular to the thickness direction of the first wall 211.

The second stop feature 2114 may be, but is not limited to, a male-female mating feature, a latch feature, etc.

By adopting the above technical scheme, the risk of sealing failure caused by the fact that the first sealing element 29a is shifted along the direction perpendicular to the thickness direction of the first wall body 211 is effectively reduced, and the sealing effect of the joint of the first wall body 211 and the deformable element 25 is further improved, so that the working reliability of the deformable element 25 is further improved, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the present application, referring to fig. 8, the second limiting structure 2114 includes a second limiting portion 21141, where the second limiting portion 21141 is disposed on the first wall 211 and abuts against the first sealing member 29a along a direction perpendicular to a thickness direction of the first wall 211, so as to limit movement of the first sealing member 29a along a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the second stopper part 21141 is disposed at a side of the first wall 211 facing the electrode assembly 22, the second stopper part 21141 is protruded from the first wall 211 in a direction toward the electrode assembly 22 along a thickness direction of the first wall 211, and the second stopper part 21141 abuts against a side of the first seal member 29a in a direction perpendicular to the thickness direction of the first wall 211 to restrict the first seal member 29a from moving in a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the first seal 29a is annular in configuration and disposed around the via 2112. The second limiting portion 21141 is in a ring structure. The second stopper 21141 is provided around the first seal 29a and abuts against the outer ring side of the first seal 29a to restrict the movement of the first seal 29a in a direction perpendicular to the thickness direction of the first wall 211, or the second stopper 21141 is provided on the inner ring side of the first seal 29a and abuts against the inner ring side of the first seal 29a to restrict the movement of the first seal 29a in a direction perpendicular to the thickness direction of the first wall 211.

The second limiting portion 21141 and the first wall 211 may be integrally formed, for example, the second limiting portion 21141 and the first wall 211 may be integrally formed by a stamping process. The second limiting portion 21141 and the first wall 211 may be separately formed and then connected together, for example, the second limiting portion 21141 and the first wall 211 may be welded together.

By adopting the above technical scheme, the second limiting structure 2114 is effectively simplified, so that the position of the first sealing member 29a is conveniently limited along the direction perpendicular to the thickness direction of the first wall 211.

In some embodiments of the present application, referring to fig. 8, the protruding height H2 of the second limiting portion 21141 from the first wall 211 is 0.1mm to 0.6mm.

The protruding height H2 of the second limiting portion 21141 from the first wall 211 refers to the dimension of the second limiting portion 21141 along the thickness direction of the first wall 211. The protruding height H2 of the second limiting portion 21141 from the first wall 211 may be selected and set in the above range according to practical application requirements, and may specifically be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

By adopting the above technical scheme, not only the position of the first sealing member 29a is effectively limited, but also the situation that the second limiting portion 21141 occupies too much space due to the overlarge protruding height of the second limiting portion 21141 can be improved, so that the volume energy density of the battery cell 20 is effectively improved.

Of course, in other embodiments, the second limiting portion 21141 may be disposed on the deformable member 25, for example, the second limiting portion 21141 may be disposed on a side of the connecting portion 252 of the deformable member 25 facing away from the electrode assembly 22.

In some embodiments of the present application, referring to fig. 8, the first wall 211 has a first sealing surface 2115, the deformable member 25 has a second sealing surface 254, the first sealing surface 2115 cooperates with the second sealing surface 254 to sandwich the first sealing member 29a, and the compression ratio of the first sealing member 29a is 2% -50% in a direction from the first sealing surface 2115 toward the second sealing surface 254.

In some embodiments, the first sealing surface 2115 and the second sealing surface 254 are disposed opposite to each other in the thickness direction of the first wall 211, in other words, the first sealing surface 2115 and the second sealing surface 254 cooperate to sandwich the first seal 29a in the thickness direction of the first wall 211, that is, the direction from the first sealing surface 2115 to the second sealing surface 254 refers to the thickness direction of the first wall 211.

The compression ratio of the first seal member 29a refers to a ratio of a compressed dimension L1 of the first seal member 29a to an original dimension of the first seal member 29a, and it is to be noted that the compressed dimension L1 of the first seal member 29a refers to a dimension of the first seal member 29a in a direction from the first seal surface 2115 toward the second seal surface 254 after being pressed by the first wall body 211 and the deformable member 25, and the original dimension of the first seal member 29a refers to a dimension of the first seal member 29a in a direction from the first seal surface 2115 toward the second seal surface 254 before being fitted between the first wall body 211 and the deformable member 25.

By adopting the above technical scheme, not only the sealing effect of the connection part of the first wall body 211 and the deformable member 25 is effectively improved, but also the risk of cracking of the first sealing member 29a caused by overlarge pressure can be reduced, thereby effectively improving the reliability of the first sealing member 29 a.

In some embodiments of the present application, referring to fig. 6, the battery cell 20 includes two deformable members 25 and two electrode terminals 23 with opposite polarities, the two electrode terminals 23 are disposed in an insulating manner with the first wall 211, and the two electrode terminals 23 are disposed in one-to-one correspondence with the two deformable members 25.

As will be appreciated, one electrode terminal 23 is a positive electrode terminal and the other electrode terminal 23 is a negative electrode terminal, the positive electrode terminal being electrically connected to the positive electrode tab of the electrode assembly 22 and the negative electrode terminal being electrically connected to the negative electrode tab of the electrode assembly 22.

The insulating arrangement of the two electrode terminals 23 and the first wall body 211 means that insulating structures are arranged between the two electrode terminals 23 and the first wall body 211, and the two insulating structures respectively insulate and separate the two electrode terminals 23 from the first wall body 211.

The arrangement of the two electrode terminals 23 in one-to-one correspondence with the two deformable members 25 means that, when the internal pressure of the battery cell 20 reaches a threshold value, one of the deformable members 25 deforms under pressure and acts in a direction approaching one of the electrode terminals 23, and the other deformable member 25 deforms under pressure and acts in a direction approaching the other electrode terminal 23 until the two deformable members 25 are in one-to-one correspondence with the two electrode terminals 23, so that the two electrode terminals 23 are electrically connected with the first wall 211, thereby cutting off the charge-discharge circuit of the battery cell 20.

By adopting the above technical scheme, the safety performance of the battery cell 20 is further improved.

Of course, in other embodiments, the positive electrode terminal may be insulated from the housing 21, the negative electrode terminal is electrically connected to the housing 21, that is, the entire housing 21 may be used as the negative electrode of the battery cell 20, the number of the deformable members 25 is one, and when the internal pressure of the battery cell 20 reaches the threshold value, the deformable members 25 act in the direction approaching the positive electrode terminal under the action of the pressure until the deformable members 25 contact the positive electrode terminal, at this time, the positive electrode and the negative electrode of the battery cell 20 are shorted, thereby cutting off the charge-discharge circuit of the battery cell 20.

The negative electrode terminal may be insulated from the casing 21, and the positive electrode terminal may be electrically connected to the casing 21, that is, the whole casing 21 may be used as the positive electrode of the battery cell 20, and the number of the deformable members 25 may be one, and when the internal pressure of the battery cell 20 reaches the threshold value, the deformable members 25 may act in a direction close to the negative electrode terminal under the action of the pressure until the deformable members 25 contact with the negative electrode terminal, at this time, the positive electrode and the negative electrode of the battery cell 20 are shorted, thereby cutting off the charge-discharge circuit of the battery cell 20.

In some embodiments of the present application, referring to fig. 7 and 8, the battery cell 20 further includes a first insulating member 28a, wherein the first insulating member 28a is disposed between the electrode terminal 23 and the first wall 211 to insulate the electrode terminal 23 from the first wall 211.

The first insulating member 28a is a member made of an insulating material, which may be, but is not limited to, polyester, epoxy, polyurethane, polybutadiene acid, silicone, polyester imide, polyimide, or the like. The first insulator 28a is located between the electrode terminal 23 and the first wall 211, and is used for insulating and separating the electrode terminal 23 from the first wall 211, so as to reduce the risk of short circuit.

By adopting the above technical scheme, the electrode terminal 23 is conveniently separated from the first wall 211 in an insulating manner.

In some embodiments of the present application, referring to fig. 9 and 10, the first wall 211 is provided with a pressure release hole 2116, the pressure release hole 2116 penetrates through two opposite sides of the first wall 211 along the thickness direction, the battery unit 20 further includes a pressure release mechanism 27a, the pressure release mechanism 27a is covered on the pressure release hole 2116, the pressure release mechanism 27a is made of different materials from the first wall 211, the pressure release mechanism 27a is fixedly connected with the first wall 211, the fixed connection portion between the pressure release mechanism 27a and the first wall 211 includes a second connecting material 26, and the melting point of the second connecting material 26 is lower than the melting point of the material of the pressure release mechanism 27a and/or the melting point of the material of the first wall 211.

The second connecting material 26 is at least part of the material constituting the fixed connection of the first wall 211 and the pressure relief mechanism 27 a. In some embodiments, the second connecting material 26 constitutes all of the fixed connection of the first wall 211 and the pressure relief mechanism 27a, in other words, the second connecting material 26 is connected between the first wall 211 and the pressure relief mechanism 27 a. The fact that the melting point of the second connecting material 26 is lower than the melting point of the material of the pressure relief mechanism 27a and/or the melting point of the material of the first wall body 211 means that the second connecting material 26 will melt when the melting point temperature of the second connecting material 26 is reached, but the first wall body 211 and/or the pressure relief mechanism 27a will not melt. As an example, the melting point of the second connection material 26 is lower than the melting point of the material of the pressure release mechanism 27a and the melting point of the material of the first wall 211. As an example, the melting point of the second connecting material 26 is lower than the melting point of the material of the pressure release mechanism 27a and is greater than or equal to the melting point of the material of the first wall 211. As an example, the melting point of the second connecting material 26 is lower than the melting point of the material of the first wall 211 and is greater than or equal to the melting point of the material of the pressure release mechanism 27 a.

Taking the melting point of the second connecting material 26 being lower than the melting point of the material of the pressure release mechanism 27a and the melting point of the material of the first wall 211 as an example, when in connection, the second connecting material 26 is heated to the melting point temperature by adopting a heating device, so that the second connecting material 26 is melted, since the melting point of the second connecting material 26 is lower than the melting point of the material of the pressure release mechanism 27a and the melting point of the material of the first wall 211, at this time, the pressure release mechanism 27a and the first wall 211 cannot be melted, the melted second connecting material 26 is adhered between the pressure release mechanism 27a and the first wall 211, and after the second connecting material 26 is cooled and solidified, the first wall 211 and the pressure release mechanism 27a are fixedly connected.

The pressure release mechanism 27a is a mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The pressure release mechanism 27a is covered on the pressure release hole 2116 to close the pressure release hole 2116, thereby isolating the internal environment of the battery cell 20 from the external environment of the battery cell 20. In the case that the internal pressure or temperature of the battery cell 20 reaches the threshold value, the pressure release mechanism 27a is ruptured under the pressure so that the internal environment of the battery cell 20 is communicated with the external environment of the battery cell 20 through the pressure release hole 2116, and the high-temperature gas can be discharged into the external environment of the battery cell 20 through the pressure release hole 2116.

The material of the pressure release mechanism 27a is different from that of the first wall 211, which means that the pressure release mechanism 27a and the first wall 211 are made of different materials, for example, the pressure release mechanism 27a is made of aluminum alloy, the first wall 211 is made of steel, and for example, the pressure release mechanism 27a is made of steel, and the first wall 211 is made of aluminum alloy.

In some embodiments, the number of the electrode terminals 23 is two, and the pressure release hole 2116 may be opened between the two electrode terminals 23.

Through adopting above-mentioned technical scheme, effectively improved the connection reliability of relief mechanism 27a and first wall 211, reduced the risk that the junction that leads to relief mechanism 27a and first wall 211 because of the material is different produces the gap to effectively promoted the reliable performance of relief mechanism 27a, and then effectively promoted the security performance of battery monomer 20.

In some embodiments of the present application, the second connecting material 26 is solder.

By adopting the above technical scheme, the connection reliability of the pressure release mechanism 27a and the first wall 211 is further improved.

Of course, in other embodiments, the second connecting material 26 may be metal.

In some embodiments of the present application, referring to fig. 10, the pressure release mechanism 27a cooperates with the first wall 211 to define a second connecting groove 261, and the second connecting material 26 is accommodated in the second connecting groove 261 and adhered to an inner surface of the second connecting groove 261.

In some embodiments, the second connection groove 261 has at least a second groove bottom surface and two second groove side surfaces provided separately on opposite sides of the second groove bottom surface, the second groove bottom surface and the two second groove side surfaces defining an inner space of the second connection groove 261, a portion of the second connection material 26 being attached to the second groove bottom surface, another portion of the second connection material 26 being attached to one second groove side surface, and yet another portion of the second connection material 26 being attached to the other second groove side surface.

By adopting the above technical scheme, not only the position of the second connecting material 26 is effectively limited, but also the attachment area of the second connecting material 26 is effectively increased, so that the connection reliability of the pressure release mechanism 27a and the first wall 211 is further improved.

In some embodiments of the application, the first wall 211 has a third connection surface 2117 and the pressure relief mechanism 27a has a fourth connection surface 271a, with the second connection material 26 being connected between the third connection surface 2117 and the fourth connection surface 271 a.

In some embodiments, third connection surface 2117 cooperates with fourth connection surface 271a to define second connection groove 261 as described above.

As an example, the third connection surface 2117 may constitute a second groove bottom surface and one second groove side surface, and the fourth connection surface 271a may constitute another second groove side surface.

As an example, the third connection surface 2117 may constitute one second groove side surface, and the fourth connection surface 271a may constitute a second groove bottom surface and the other second groove side surface.

As an example, the third connection surface 2117 may constitute a part of the second groove bottom surface and one second groove side surface, and the fourth connection surface 271a may constitute another part of the second groove bottom surface and another second groove side surface.

In some embodiments of the application, third connection surface 2117 is curved.

In other embodiments of the present application, the fourth connection surface 271a is curved.

In still other embodiments of the present application, third connection surface 2117 and fourth connection surface 271a are each curved.

By adopting the above technical scheme, the attachment area of the second connecting material 26 is effectively increased, so that the connection reliability of the pressure release mechanism 27a and the first wall 211 is further improved.

In some embodiments of the application, third connection surface 2117 is a roughened surface.

In other embodiments of the present application, the fourth connection surface 271a is a roughened surface.

In still other embodiments of the present application, third connection surface 2117 and fourth connection surface 271a are both roughened surfaces.

The rough surface refers to a surface structure composed of a plurality of fine concave-convex bodies, such as a frosted surface. The third connection surface 2117 and the fourth connection surface 271a may be polished to a rough surface using a polishing process, for example, the third connection surface 2117 and the fourth connection surface 271a may be polished using a polishing wheel such that the third connection surface 2117 and the fourth connection surface 271a form a frosted surface.

By adopting the technical scheme, the adhesive force of the second connecting material 26 on the third connecting surface 2117 and the fourth connecting surface 271a is effectively improved, so that the connection reliability of the pressure release mechanism 27a and the first wall 211 is further improved.

In some embodiments of the present application, the second connecting material 26 is disposed around the pressure relief mechanism 27 a.

In other words, the second connection material 26 has an annular structure, and accordingly, the third connection surface 2117 and the fourth connection surface 271a are annular surfaces, wherein the third connection surface 2117 is disposed around the pressure relief mechanism 27a, and the fourth connection surface 271a is at least a portion of the outer peripheral surface of the pressure relief mechanism 27 a.

Through adopting above-mentioned technical scheme, can connect relief mechanism 27a and first wall 211 along relief mechanism 27 a's circumference through second linking material 26 to form annular seal boundary between relief mechanism 27a and the first wall 211, not only effectively seal the gap between relief mechanism 27a and the first wall 211, can also make relief mechanism 27a atress become more even, thereby further improved the connection reliability of relief mechanism 27a and first wall 211.

In some embodiments of the present application, referring to fig. 10, a third limiting structure 2118 is disposed between the first wall 211 and the pressure release mechanism 27a, and the third limiting structure 2118 is used for limiting the relative positions of the first wall 211 and the pressure release mechanism 27a along a direction perpendicular to the thickness direction of the first wall 211.

The third stopper 2118 is a structure for restricting the relative positions of the first wall 211 and the pressure release mechanism 27a in a direction perpendicular to the thickness direction of the first wall 211, that is, the first wall 211 and the pressure release mechanism 27a are relatively fixed in a direction perpendicular to the thickness direction of the first wall 211.

As an example, the third limiting structure 2118 is used to limit the relative positions of the first wall 211 and the pressure release mechanism 27a along the width direction of the first wall 211.

As an example, the third limiting structure 2118 is used to limit the relative positions of the first wall 211 and the pressure release mechanism 27a along the length direction of the first wall 211.

As an example, the third limiting structure 2118 is used to limit any relative position of the first wall 211 and the pressure release mechanism 27a along a plane direction perpendicular to the thickness direction of the first wall 211.

The third stop feature 2118 may be, but is not limited to, a male-female mating feature, a latch feature, etc.

Through adopting above-mentioned technical scheme, effectively restrict the relative position of first wall 211 and relief mechanism 27a along the direction mutually perpendicular with the thickness direction of first wall 211 to effectively reduced because of the cracked risk of relief mechanism 27a and the fixed connection department of first wall 211 that the relief mechanism 27a takes place the displacement, thereby further promoted the operational reliability of relief mechanism 27a, further promoted the security performance of battery monomer 20.

In some embodiments of the present application, referring to fig. 10, the third limiting structure 2118 includes a third limiting portion 21181, and a third limiting portion 21181 is disposed on the first wall 211 and abuts against the pressure release mechanism 27a along a direction perpendicular to a thickness direction of the first wall 211, so as to limit a relative position of the first wall 211 and the pressure release mechanism 27a along a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the first wall 211 and the pressure release mechanism 27a are abutted against each other along the thickness direction of the first wall 211, the third stopper 21181 is disposed on a side of the first wall 211 facing the electrode assembly 22, the third stopper 21181 is disposed protruding from the first wall 211 along the thickness direction of the first wall 211 toward a direction close to the electrode assembly 22, and the third stopper 21181 abuts against a side of the pressure release mechanism 27a along a direction perpendicular to the thickness direction of the first wall 211 to restrict the relative positions of the first wall 211 and the pressure release mechanism 27a along a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the third limiting portion 21181 has an annular structure, and the third limiting portion 21181 is disposed around the pressure relief mechanism 27a and abuts against an outer peripheral side of the pressure relief mechanism 27a to limit a relative position of the first wall 211 and the pressure relief mechanism 27a along a direction perpendicular to a thickness direction of the first wall 211.

The third limiting portion 21181 and the first wall 211 may be integrally formed, for example, the third limiting portion 21181 and the first wall 211 may be integrally formed by a stamping process. The third limiting portion 21181 and the first wall 211 may be separately formed and then connected together, for example, the third limiting portion 21181 and the first wall 211 may be welded together.

By adopting the above technical scheme, the third limiting structure 2118 is effectively simplified, so that the relative position of the first wall 211 and the pressure release mechanism 27a along the direction perpendicular to the thickness direction of the first wall 211 is conveniently limited.

In some embodiments of the present application, referring to fig. 10, a protruding height H3 of the third limiting portion 21181 from the first wall 211 is 0.1mm to 0.6mm.

The protruding height H3 of the third limiting portion 21181 from the first wall 211 refers to the dimension of the third limiting portion 21181 along the thickness direction of the first wall 211. The protruding height H3 of the third limiting portion 21181 from the first wall 211 may be selected and set in the above range according to practical application requirements, and may specifically be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

By adopting the above technical scheme, not only the relative position of the first wall 211 and the pressure release mechanism 27a along the direction perpendicular to the thickness direction of the first wall 211 can be effectively limited, but also the situation that the third limiting part 21181 occupies too much space due to the overlarge protruding height of the third limiting part 21181 can be improved, so that the volume energy density of the battery cell 20 is effectively improved.

In some embodiments of the present application, referring to fig. 9 and 10, the battery cell 20 further includes a second sealing member 29b, and the second sealing member 29b is disposed between the first wall 211 and the pressure release mechanism 27a to seal and connect the first wall 211 and the pressure release mechanism 27a.

The second seal 29b is a member for closing the gap between the first wall 211 and the pressure release mechanism 27 a. The second seal 29b may be made of a flexible material, which may be, but is not limited to, rubber, silicone, etc. The first wall 211 presses the second seal 29b in cooperation with the pressure release mechanism 27a to compressively deform the second seal 29b, thereby closing the gap between the first wall 211 and the pressure release mechanism 27 a.

By adopting the technical scheme, the sealing effect of the joint of the first wall 211 and the pressure release mechanism 27a is effectively improved, so that the working reliability of the pressure release mechanism 27a is further improved, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the application, a second seal 29b is disposed around the relief hole 2116.

It will be appreciated that the second seal 29b has an annular structure, the shape of the second seal 29b is adapted to the shape of the pressure relief hole 2116, for example, the shape of the pressure relief hole 2116 is elliptical, and the second seal 29b has an elliptical ring structure.

Through adopting above-mentioned technical scheme, effectively block the communication path between pressure release hole 2116 and the internal environment of shell 21, further improved the sealed effect of the junction of first wall 211 and pressure release mechanism 27a to further promoted pressure release mechanism 27 a's operational reliability, further promoted the security performance of battery monomer 20.

In some embodiments of the present application, referring to fig. 10, the first wall 211 and the pressure release mechanism 27a cooperate to clamp the second sealing member 29b along the thickness direction of the first wall 211, at least one of the first wall 211 and the pressure release mechanism 27a is provided with a fourth limiting structure 2119, and the fourth limiting structure 2119 is used to limit the movement of the second sealing member 29b along the direction perpendicular to the thickness direction of the first wall 211.

The fourth stopper structure 2119 is a structure for restricting movement of the second seal 29b in a direction perpendicular to the thickness direction of the first wall 211. The fourth limiting structure 2119 may be disposed on the first wall 211, may be disposed on the pressure release mechanism 27a, or may be a part of the fourth limiting structure 2119 disposed on the first wall 211, and another part of the fourth limiting structure 2119 disposed on the pressure release mechanism 27 a.

As an example, the fourth stopper 2119 is provided for restricting the movement of the second seal 29b in the width direction of the first wall 211.

As an example, the fourth limiting structure 2119 is used to limit the movement of the second seal 29b along the length direction of the first wall 211.

As an example, the fourth stopper 2119 is provided for restricting the movement of the second seal 29b in a plane direction perpendicular to the thickness direction of the first wall 211.

The fourth stop feature 2119 may be, but is not limited to, a male-female mating feature, a latch feature, etc.

By adopting the above technical scheme, the risk of sealing failure caused by the fact that the second sealing piece 29b shifts along the direction perpendicular to the thickness direction of the first wall body 211 is effectively reduced, the sealing effect of the joint of the first wall body 211 and the pressure release mechanism 27a is further improved, the working reliability of the pressure release mechanism 27a is further improved, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the present application, referring to fig. 10, the fourth limiting structure 2119 includes a fourth limiting portion 21191, where the fourth limiting portion 21191 is disposed on the first wall 211 and abuts against the second sealing member 29b along a direction perpendicular to a thickness direction of the first wall 211, so as to limit movement of the second sealing member 29b along the direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the fourth stopper 21191 is disposed at a side of the first wall 211 facing the electrode assembly 22, the fourth stopper 21191 is protruded from the first wall 211 in a direction approaching the electrode assembly 22 along a thickness direction of the first wall 211, and the fourth stopper 21191 abuts against a side of the second seal 29b in a direction perpendicular to the thickness direction of the first wall 211 to restrict movement of the second seal 29b in a direction perpendicular to the thickness direction of the first wall 211.

In some embodiments, the second seal 29b is annular in configuration and is disposed around the relief hole 2116. The fourth stopper 21191 has an annular structure. The fourth stopper 21191 is provided around the second seal 29b and abuts against the outer ring side of the second seal 29b to restrict movement of the second seal 29b in a direction perpendicular to the thickness direction of the first wall 211, or the fourth stopper 21191 is provided on the inner ring side of the second seal 29b and abuts against the inner ring side of the second seal 29b to restrict movement of the second seal 29b in a direction perpendicular to the thickness direction of the first wall 211.

The fourth limiting portion 21191 and the first wall 211 may be integrally formed, for example, the fourth limiting portion 21191 and the first wall 211 may be integrally formed by a stamping process. The fourth limiting portion 21191 and the first wall 211 may be integrally formed and then connected, for example, the fourth limiting portion 21191 and the first wall 211 may be integrally welded.

By adopting the above technical scheme, the fourth limiting structure 2119 is effectively simplified, so that the position of the second sealing member 29b is conveniently limited in the direction perpendicular to the thickness direction of the first wall 211.

In some embodiments of the present application, referring to fig. 10, a protrusion height H4 of the fourth limiting portion 21191 from the first wall 211 is 0.1mm to 0.6mm.

The protrusion height H4 of the fourth stopper portion 21191 from the first wall 211 refers to the dimension of the fourth stopper portion 21191 in the thickness direction of the first wall 211. The protrusion height H4 of the fourth limiting portion 21191 from the first wall 211 may be selected and set within the above range according to practical application requirements, and may specifically be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

By adopting the above technical scheme, not only the position of the second sealing member 29b is effectively limited, but also the situation that the fourth limiting portion 21191 occupies too much space due to the overlarge protrusion height of the fourth limiting portion 21191 can be improved, thereby effectively improving the volumetric energy density of the battery cell 20.

Of course, in other embodiments, the fourth limiting portion 21191 may be provided on the pressure relief mechanism 27a, for example, the fourth limiting portion 21191 may be provided on a side of the pressure relief mechanism 27a facing away from the electrode assembly 22.

In some embodiments of the present application, referring to fig. 10, the first wall 211 has a third sealing surface 21120, the pressure relief mechanism 27a has a fourth sealing surface 272a, the third sealing surface 21120 cooperates with the fourth sealing surface 272a to sandwich the second seal 29b, and the compression ratio of the second seal 29b is 2% -50% in a direction from the third sealing surface 21120 toward the fourth sealing surface 272 a.

In some embodiments, the third sealing surface 21120 and the fourth sealing surface 272a are disposed opposite to each other in the thickness direction of the first wall 211, in other words, the third sealing surface 21120 and the fourth sealing surface 272a cooperate to sandwich the second seal 29b in the thickness direction of the first wall 211, i.e., the direction from the third sealing surface 21120 to the fourth sealing surface 272a refers to the thickness direction of the first wall 211.

The compression ratio of the second seal 29b refers to a ratio of a compressed dimension L2 of the second seal 29b to an original dimension of the second seal 29b, and it should be noted that the compressed dimension L2 of the second seal 29b refers to a dimension of the second seal 29b in a direction from the third seal surface 21120 to the fourth seal surface 272a after being pressed by the first wall 211 and the pressure release mechanism 27a, and the original dimension of the second seal 29b refers to a dimension of the second seal 29b in a direction from the third seal surface 21120 to the fourth seal surface 272a before being assembled between the first wall 211 and the pressure release mechanism 27 a.

By adopting the technical scheme, the sealing effect of the joint of the first wall body 211 and the pressure relief mechanism 27a is effectively improved, the risk of cracking of the second sealing element 29b caused by overlarge pressure can be reduced, and the reliability of the second sealing element 29b is effectively improved.

In some embodiments of the application, the pressure relief mechanism 27a is an aluminum alloy article.

In other words, the pressure release mechanism 27a is made of an aluminum alloy.

By adopting the above technical scheme, the pressure release mechanism 27a is convenient to open and release the internal pressure of the battery cell 20 under the condition that the internal pressure of the battery cell 20 reaches the threshold value, thereby further improving the safety performance of the battery cell 20.

In some embodiments of the present application, referring to fig. 9 and 10, the battery cell 20 further includes a protection sheet 27b, the protection sheet 27b is disposed on a side of the first wall 211 facing away from the electrode assembly 22 and covers the pressure release hole 2116, and the pressure release mechanism 27a is disposed on a side of the first wall 211 facing the electrode assembly 22.

The protection sheet 27b is a member for closing the external port of the pressure release hole 2116 to block foreign objects from entering the pressure release hole 2116. The protective sheet 27b may be a film or a plate. The material of the protective member may be, but is not limited to, polyimide, polyvinyl chloride, polyester substrate, polyurethane, etc.

By adopting the technical scheme, foreign matters such as electrolyte and dust can be prevented from entering the pressure relief hole 2116, and adverse effects of the foreign matters on the pressure relief mechanism 27a are reduced, so that the safety performance of the battery cell 20 is further improved.

In some embodiments of the present application, the protective sheet 27b is adhered to the first wall 211.

In some embodiments, an adhesive layer may be provided on the protective sheet 27b, and the protective sheet 27b is adhered to the first wall 211 by the adhesive layer.

In other embodiments, an adhesive may be applied to the first wall 211, and the protective sheet 27b is adhered to the first wall 211 by the adhesive.

By adopting the above-described technical scheme, the protection sheet 27b is easily fixed to the first wall body 211.

In some embodiments of the present application, referring to fig. 6, the cover 212 forms a first wall 211, the first wall 211 is connected to the housing 213, and the material of the first wall 211 is the same as that of the housing 213.

The material of the first wall 211 is the same as that of the housing 213, which means that the first wall 211 and the housing 213 are made of the same material, for example, the housing 213 and the first wall 211 are made of steel materials, and for example, the housing 213 and the first wall 211 are made of aluminum alloy.

By adopting the above technical scheme, since the material of the first wall body 211 is the same as the material of the housing 213, the material characteristics of the first wall body 211 are also the same as the material characteristics of the housing 213, and the material state change difference generated by the first wall body 211 and the housing 213 under the influence of environmental factors such as temperature and air pressure is effectively reduced, so that the connection reliability of the first wall body 211 and the housing 213 is effectively improved, the risk that a gap is generated at the connection position of the first wall body 211 and the housing 213 is effectively reduced, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the application, housing 213 is welded to first wall 211.

The welding of the housing 213 to the first wall 211 means that at least a portion of the housing 213 and at least a portion of the first wall 211 are melted under the high temperature, and the melted portion of the housing 213 and the melted portion of the first wall 211 are combined by infiltration, and the housing 213 is connected to the first wall 211 after the melted portion of the housing 213 and the melted portion of the first wall 211 are solidified.

The welding method of the housing 213 and the first wall 211 may be, but not limited to, laser welding, arc welding, ultrasonic welding, or the like.

By adopting the above technical solution, since the material of the first wall 211 is the same as the material of the housing 213, in the welding process, the melted portion of the first wall 211 can be better combined with the melted portion of the housing 213, thereby further improving the connection reliability of the first wall 211 and the housing 213.

In some embodiments of the present application, deformable member 25 is an aluminum member and first wall 211 is a steel member.

In other words, the deformable member 25 is made of an aluminum alloy, and the first wall 211 is made of a steel material.

Under the condition that the volumes are equal, the weight of the aluminum alloy part is smaller than that of the steel part, and the hardness of the steel part is larger than that of the aluminum alloy part, by adopting the technical scheme, the connection reliability of the deformable part 25 and the first wall body 211 is improved, and the structural strength of the first wall body 211 is also improved.

In some embodiments of the present application, referring to fig. 11, the battery cell 20 further includes a second insulating member 28b disposed on a side of the first wall 211 facing the electrode assembly 22, the second insulating member 28b including an insulating body 281b and a first blocking portion 282b connected to the insulating body 281b, the first blocking portion 282b being disposed opposite to the deformable member 25.

The second insulating member 28b is a member made of an insulating material, which may be, but is not limited to, polyester, epoxy, polyurethane, polybutadiene acid, silicone, polyester imide, polyimide, or the like. The second insulating member 28b is located on a side of the first wall 211 facing the electrode assembly 22 to insulate the first wall 211, the deformable member 25, the pressure release mechanism 27a, and the like from the electrode assembly 22, reducing the risk of short circuits.

The insulating body 281b is a body portion of the second insulating member 28b for insulating and separating the first wall 211 from the electrode assembly 22. The first stopper 282b is coupled to the insulating body 281b at a position facing the deformable member 25, and serves to protect the deformable member 25 and also to insulate the deformable member 25 from the electrode assembly 22. The first blocking portion 282b and the insulating main body 281b may be integrally formed, for example, the first blocking portion 282b and the insulating main body 281b may be integrally formed by injection molding, or the first blocking portion 282b and the insulating main body 281b may be integrally connected to each other after being separately formed, for example, the first blocking portion 282b is adhered to the insulating main body 281 b.

By adopting the technical scheme, the protection effect on the deformable member 25 is effectively achieved, and the risk of damage caused by interference between the deformable member 25 and other components in the battery cell 20 is effectively reduced.

In some embodiments of the present application, referring to fig. 11, the first blocking portion 282b is provided with a first gas hole 2821b, and the first gas hole 2821b is used for gas to flow from the electrode assembly 22 to the deformable member 25.

The first gas holes 2821b penetrate through the first blocking portion 282b so that gas generated from the electrode assembly 22 can enter the first blocking portion 282b and flow to the deformable member 25, the number of the first gas holes 2821b may be one or more, and in the case that the number of the first gas holes 2821b is more, the plurality of first gas holes 2821b may be uniformly distributed on the first blocking portion 282 b.

In some embodiments, the first blocking portion 282b has a first cavity formed therein, and at least a portion of the deformable member 25 is received in the first cavity, and the first cavity is in communication with the cavity of the housing 213 through the first air hole 2821b, so that the air generated by the electrode assembly 22 can enter the first cavity and flow to the first cavity.

By adopting the above technical scheme, under the condition that the battery cell 20 is overcharged, the gas generated by the electrode assembly 22 can reach the deformable member 25 through the first gas hole 2821b and push the deformable member 25 to act towards the electrode terminal 23, so that the deformable member 25 and the electrode terminal 23 are contacted with each other, and the charge and discharge loop of the battery cell 20 is cut off, and the safety performance of the battery cell 20 is further improved.

In some embodiments of the present application, referring to fig. 11, the second insulating member 28b further includes a second blocking portion 283b connected to the insulating main body 281b, the second blocking portion 283b is disposed opposite to the pressure release mechanism 27a, the second blocking portion 283b is provided with a second air hole 2831b, and the second air hole 2831b is used for allowing air to flow from the electrode assembly 22 to the pressure release mechanism 27a.

The second blocking portion 283b is connected to a portion of the insulating main body 281b facing the pressure relief mechanism 27a, and serves to protect the pressure relief mechanism 27a and to insulate the pressure relief mechanism 27a from the electrode assembly 22. The first stop portion 282b, the second stop portion 283b and the insulating body 281b may be integrally formed, for example, the first stop portion 282b, the second stop portion 283b and the insulating body 281b may be integrally formed by injection molding, or the first stop portion 282b, the second stop portion 283b and the insulating body 281b may be integrally connected to each other after being respectively formed, for example, the first stop portion 282b and the second stop portion 283b may be respectively adhered to the insulating body 281 b.

The second air holes 2831b penetrate through the second blocking portion 283b, so that the gas generated by the electrode assembly 22 can enter the second blocking portion 283b and flow to the pressure release mechanism 27a, the number of the second air holes 2831b may be one or more, and in the case that the number of the second air holes 2831b is more, the plurality of the second air holes 2831b may be uniformly distributed on the second blocking portion 283 b.

In some embodiments, the second blocking portion 283b has a second cavity formed therein, and at least a portion of the pressure relief mechanism 27a is accommodated in the second cavity, and the second cavity is in communication with the accommodating cavity of the housing 213 through the second air hole 2831b, so that the gas generated by the electrode assembly 22 can enter the second cavity and flow to the pressure relief mechanism 27a.

Through adopting above-mentioned technical scheme, effectively play the guard action to relief mechanism 27a, effectively reduced the risk that relief mechanism 27a and other parts of battery monomer 20 take place to interfere and cause the damage, in addition, the produced gas of electrode assembly 22 accessible second gas pocket 2831b reaches relief mechanism 27a to make relief mechanism 27a break under the condition that the internal pressure of battery monomer 20 reaches the threshold value, further improved the security performance of battery monomer 20.

In some embodiments of the present application, the battery cell 20 includes an electrode assembly 22, a housing 21, an electrode terminal 23, a deformable member 25, a first seal 29a, a pressure relief mechanism 27a, and a second seal 29b. The case 21 is used for accommodating the electrode assembly 22, the case 21 includes a case 213 and a cover 212, the cover 212 and the case 213 are made of steel, and the cover 212 is welded with the case 213. The cover 212 forms a first wall 211 of the housing 21, and the first wall 211 is provided with an electrode lead-out hole, a via hole 2112 and a pressure release hole 2116, and the electrode lead-out hole, the via hole 2112 and the pressure release hole 2116 penetrate through two opposite sides of the first wall 211 in the thickness direction. The electrode terminal 23 is connected to the electrode lead hole and serves to electrically connect the electrode assembly 22. The deformable member 25 is an aluminum alloy member, the deformable member 25 covers the via hole 2112, and the deformable member 25 is configured to be deformable to contact the electrode terminal 23 through the via hole 2112 so as to electrically connect the first wall 211 with the electrode terminal 23. The deformable member 25 is fixedly connected to the first wall 211, and the fixed connection between the deformable member 25 and the first wall 211 includes a first connecting material 24, where the melting point of the first connecting material 24 is lower than the melting point of the material of the deformable member 25 and/or the melting point of the material of the first wall 211. The first connecting material 24 is solder. The first sealing member 29a is disposed between the first wall 211 and the deformable member 25 to sealingly connect the first wall 211 and the deformable member 25. The pressure release mechanism 27a is an aluminum alloy part, the pressure release mechanism 27a covers the pressure release hole 2116, the pressure release mechanism 27a is fixedly connected with the first wall 211, the fixed connection part of the pressure release mechanism 27a and the first wall 211 comprises a second connecting material 26, and the melting point of the second connecting material 26 is lower than the melting point of the material of the pressure release mechanism 27a and/or the melting point of the material of the first wall 211. The second joining material 26 is solder. The second sealing member 29b is disposed between the first wall 211 and the pressure release mechanism 27a to seal and connect the first wall 211 and the pressure release mechanism 27a.

By adopting the technical scheme, the connection reliability of the deformable member 25 and the first wall body 211 is obviously improved, and the sealing effect of the connection part of the first wall body 211 and the deformable member 25 is effectively improved, so that the working reliability of the deformable member 25 is effectively improved, and the safety performance of the battery cell 20 is further improved. In addition, the connection reliability of the pressure release mechanism 27a and the first wall body 211 is obviously improved, the communication path between the pressure release hole 2116 and the internal environment of the shell 21 is effectively blocked, the sealing effect of the connection part of the first wall body 211 and the pressure release mechanism 27a is improved, the working reliability of the pressure release mechanism 27a is improved, and therefore the safety performance of the battery cell 20 is effectively improved.

In a second aspect, referring to fig. 3, a battery 100 is provided according to an embodiment of the present application, including the battery cell 20 according to any one of the above embodiments.

The battery 100 according to the embodiment of the present application adopts the battery cell 20 according to any one of the embodiments, so that the safety performance of the battery 100 is effectively improved.

In a third aspect, referring to fig. 2, an energy storage device 2000 is provided according to an embodiment of the present application, including the battery 100 described above.

The battery 100 of any one of the embodiments is adopted in the energy storage device 2000 provided by the embodiment of the present application, so that the safety performance of the energy storage device 2000 is effectively improved.

In a fourth aspect, referring to fig. 1, an embodiment of the present application provides an electric device, including the battery 100.

The electric equipment provided by the embodiment of the application adopts the battery 100 of any one embodiment, so that the safety performance of the electric equipment is effectively improved.

The foregoing is merely an alternative embodiment of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery cell, characterized in that it comprises:

Electrode assembly;

A housing for accommodating the electrode assembly, the housing including a first wall;

Electrode terminals are used for electrically connecting the electrode assembly, and the electrode terminals are disposed on the first wall.

A deformable element is configured to deform to contact the electrode terminal so that the first wall is electrically connected to the electrode terminal, wherein the material of the deformable element is different from the material of the first wall.

The deformable component is configured to be fixedly connected to the first wall body, and a first connecting material is included at the fixed connection between the deformable component and the first wall body. The melting point of the first connecting material is lower than the melting point of the material of the deformable component and/or the melting point of the material of the first wall body.

2. The battery cell according to claim 1, wherein the first connecting material is a solder.

3. The battery cell according to claim 1 or 2, wherein the deformable member cooperates with the first wall to define a first connecting groove, and the first connecting material is accommodated in the first connecting groove and attached to the inner surface of the first connecting groove.

4. The battery cell according to claim 1 or 2, wherein the first wall has a first connecting surface, the deformable member has a second connecting surface, the first connecting material is connected between the first connecting surface and the second connecting surface, and the first connecting surface and/or the second connecting surface is a curved surface.

5. The battery cell according to claim 1 or 2, wherein the first wall has a first connecting surface, the deformable member has a second connecting surface, the first connecting material is connected between the first connecting surface and the second connecting surface, and the first connecting surface and/or the second connecting surface is a rough surface.

6. The battery cell according to any one of claims 1-5, wherein the first connecting material is disposed around the deformable member.

7. The battery cell according to any one of claims 1-6, characterized in that a first limiting structure is provided between the first wall and the deformable member, the first limiting structure being used to limit the relative position of the first wall and the deformable member in a direction perpendicular to the thickness direction of the first wall.

8. The battery cell according to claim 7, wherein the first limiting structure includes a first limiting part, the first limiting part being disposed on the first wall and abutting against the deformable member in a direction perpendicular to the thickness direction of the first wall, so as to limit the relative position of the first wall and the deformable member in a direction perpendicular to the thickness direction of the first wall.

9. The battery cell according to claim 8, wherein the first limiting portion protrudes from the first wall body along the thickness direction of the first wall body, and the protrusion height of the first limiting portion from the first wall body is 0.1mm-0.6mm.

10. The battery cell according to any one of claims 1-9, characterized in that the first wall has a through hole extending through opposite sides of the first wall in the thickness direction, and the deformable member is configured to deform to contact the electrode terminal through the through hole, so that the first wall is electrically connected to the electrode terminal.

11. The battery cell according to claim 10, wherein the deformable member includes a connecting portion and a deformable portion, the connecting portion is configured to be fixedly connected to the first wall body, the connecting portion is disposed around the deformable portion and the through hole, and the deformable portion is configured to be deformable to contact the electrode terminal through the through hole, so that the first wall body is electrically connected to the electrode terminal.

12. The battery cell according to claim 10 or 11, wherein the electrode terminal is provided with a protrusion at the through hole protruding toward the deformable member, the deformable member being configured to deform to contact the protrusion through the through hole, so that the first wall is electrically connected to the electrode terminal.

13. The battery cell according to any one of claims 10-12, wherein the battery cell further comprises a first sealing member disposed between the first wall and the deformable member to seal the connection between the first wall and the deformable member.

14. The battery cell according to claim 13, wherein the first sealing member is disposed around the through hole.

15. The battery cell according to claim 13 or 14, characterized in that the first wall and the deformable member cooperate to clamp the first sealing member along the thickness direction of the first wall, and at least one of the first wall and the deformable member is provided with a second limiting structure, the second limiting structure being used to restrict the first sealing member from moving in a direction perpendicular to the thickness direction of the first wall.

16. The battery cell according to claim 15, wherein the second limiting structure includes a second limiting part, the second limiting part being disposed on the first wall and abutting against the first sealing member in a direction perpendicular to the thickness direction of the first wall, so as to restrict the first sealing member from moving in a direction perpendicular to the thickness direction of the first wall.

17. The battery cell according to claim 16, wherein the second limiting portion protrudes from the first wall body along the thickness direction of the first wall body, and the protrusion height of the second limiting portion from the first wall body is 0.1mm-0.6mm.

18. The battery cell according to any one of claims 13-17, characterized in that the first wall has a first sealing surface, the deformable member has a second sealing surface, the first sealing surface and the second sealing surface cooperate to clamp the first sealing member, and the compression rate of the first sealing member is 2%-50% in the direction from the first sealing surface to the second sealing surface.

19. The battery cell according to any one of claims 1-18, characterized in that the battery cell comprises two deformable members and two electrode terminals with opposite polarities, the two electrode terminals being insulated from the first wall, and the two electrode terminals being disposed in a one-to-one correspondence with the two deformable members.

20. The battery cell according to any one of claims 1-19, wherein the battery cell further comprises a first insulating member disposed between the electrode terminal and the first wall body to insulate the electrode terminal from the first wall body.

21. The battery cell according to any one of claims 1-20, characterized in that the first wall has a pressure relief hole, the pressure relief hole penetrates both sides of the first wall along the thickness direction, the battery cell further includes a pressure relief mechanism, the pressure relief mechanism is disposed on the pressure relief hole, the material of the pressure relief mechanism is different from the material of the first wall, the pressure relief mechanism is configured to be fixedly connected to the first wall, and a second connecting material is included at the fixed connection between the pressure relief mechanism and the first wall, the melting point of the second connecting material is lower than the melting point of the material of the pressure relief mechanism and/or the melting point of the material of the first wall.

22. The battery cell according to claim 21, wherein the second connecting material is a solder.

23. The battery cell according to claim 21 or 22, wherein the pressure relief mechanism cooperates with the first wall to define a second connecting groove, and the second connecting material is accommodated in the second connecting groove and attached to the inner surface of the second connecting groove.

24. The battery cell according to claim 21 or 22, wherein the first wall has a third connecting surface, the pressure relief mechanism has a fourth connecting surface, the second connecting material is connected between the third connecting surface and the fourth connecting surface, and the third connecting surface and/or the fourth connecting surface is a curved surface.

25. The battery cell according to claim 21 or 22, wherein the first wall has a third connecting surface, the pressure relief mechanism has a fourth connecting surface, the second connecting material is connected between the third connecting surface and the fourth connecting surface, and the third connecting surface and/or the fourth connecting surface is a rough surface.

26. The battery cell according to any one of claims 23-25, wherein the second connecting material is disposed around the pressure relief mechanism.

27. The battery cell according to any one of claims 21-26, characterized in that a third limiting structure is provided between the first wall and the pressure relief mechanism, the third limiting structure being used to limit the relative position of the first wall and the pressure relief mechanism in a direction perpendicular to the thickness direction of the first wall.

28. The battery cell according to claim 27, wherein the third limiting structure includes a third limiting part, the third limiting part being disposed on the first wall and abutting against the pressure relief mechanism in a direction perpendicular to the thickness direction of the first wall, so as to limit the relative position of the first wall and the pressure relief mechanism in a direction perpendicular to the thickness direction of the first wall.

29. The battery cell according to claim 28, wherein the third limiting portion protrudes from the first wall body along the thickness direction of the first wall body, and the protrusion height of the third limiting portion from the first wall body is 0.1mm-0.6mm.

30. The battery cell according to any one of claims 21-29, wherein the battery cell further comprises a second sealing member disposed between the first wall and the pressure relief mechanism to seal the connection between the first wall and the pressure relief mechanism.

31. The battery cell according to claim 30, wherein the second seal is disposed around the pressure relief hole.

32. The battery cell according to claim 30 or 31, characterized in that the first wall and the pressure relief mechanism cooperate to clamp the second sealing member along the thickness direction of the first wall, and at least one of the first wall and the pressure relief mechanism is provided with a fourth limiting structure, the fourth limiting structure being used to restrict the movement of the second sealing member in a direction perpendicular to the thickness direction of the first wall.

33. The battery cell according to claim 32, wherein the fourth limiting structure includes a fourth limiting part, the fourth limiting part being disposed on the first wall and abutting against the second sealing member in a direction perpendicular to the thickness direction of the first wall, so as to restrict the movement of the second sealing member in a direction perpendicular to the thickness direction of the first wall.

34. The battery cell according to claim 33, wherein the fourth limiting portion protrudes from the first wall body along the thickness direction of the first wall body, and the protrusion height of the fourth limiting portion from the first wall body is 0.1mm-0.6mm.

35. The battery cell according to any one of claims 30-34, characterized in that the first wall has a third sealing surface, the pressure relief mechanism has a fourth sealing surface, the third sealing surface and the fourth sealing surface cooperate to clamp the second sealing member, and the compression rate of the second sealing member is 2%-50% in the direction from the third sealing surface to the fourth sealing surface.

36. The battery cell according to any one of claims 21-35, wherein the pressure relief mechanism is made of aluminum alloy.

37. The battery cell according to any one of claims 21-36, wherein the battery cell further comprises a protective sheet disposed on the side of the first wall facing away from the electrode assembly and covering the pressure relief hole, and the pressure relief mechanism is disposed on the side of the first wall facing the electrode assembly.

38. The battery cell according to claim 37, wherein the protective sheet is adhered to the first wall.

39. The battery cell according to any one of claims 1-38, wherein the outer casing comprises a housing and a cover disposed on the housing, the cover constituting the first wall, the first wall being connected to the housing, and the material of the first wall being the same as that of the housing.

40. The battery cell according to claim 39, wherein the casing is welded to the first wall.

41. The battery cell according to any one of claims 1-40, wherein the deformable part is an aluminum part and the first wall is a steel part.

42. The battery cell according to any one of claims 1-41, wherein the battery cell further comprises a second insulating member disposed on the side of the first wall facing the electrode assembly, the second insulating member comprising an insulating body and a first stop connected to the insulating body, the first stop being disposed opposite to the deformable member.

43. The battery cell according to claim 42, wherein the first stop portion is provided with a first vent hole, the first vent hole being used to allow gas to flow from the electrode assembly to the deformable member.

44. A battery, characterized in that the battery comprises a battery cell as described in any one of claims 1-43.

45. An energy storage device, characterized in that the energy storage device comprises the battery as described in claim 44.

46. An electrical appliance, characterized in that the electrical appliance comprises the battery as described in claim 44.