CN116404280A

CN116404280A - Energy storage device and electric equipment

Info

Publication number: CN116404280A
Application number: CN202310657041.7A
Authority: CN
Inventors: 李奇; 陈志雄
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-07-07
Anticipated expiration: 2043-06-05
Also published as: CN116404280B

Abstract

The application discloses an energy storage device and electric equipment relates to energy storage technical field. The energy storage device includes: a housing including a receiving chamber having an opening; an electrode assembly accommodated in the accommodation chamber; an end cap unit sealing an opening of the accommodating chamber; the metal adapter comprises a tray body and a convex part, the tray body is provided with a first surface and a second surface which are opposite to each other, the convex part is provided with a containing cavity, the tray body is positioned between the electrode assembly and the end cover unit, the first surface of the tray body is connected with the electrode assembly, the convex part is respectively connected with the second surface of the tray body and the end cover unit, and the containing cavity is communicated with the containing cavity; and the getter is accommodated in the accommodating cavity. In the embodiment of the application, the accommodating cavity of the convex part is internally provided with the air suction substance, so that harmful gas generated in the working process of the energy storage device can be absorbed by the air suction substance, and the safety of the energy storage device in use is improved; in addition, the convex part that combines the metal adapter to include sets up the accommodation chamber, has improved the space utilization of metal adapter.

Description

Energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to an energy storage device and electric equipment.

Background

Because of the strong timeliness and space properties of energy sources required by people, in order to reasonably utilize the energy sources and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then is converted into another energy form, and then is released in a specific energy form based on future application requirements. As is well known, the purpose of generating green electric energy is achieved by mainly replacing fossil energy with green energy.

The existing green energy mainly comprises light energy, wind energy, water potential and the like, and the problems of strong intermittence and large fluctuation of the light energy, the wind energy and the like generally exist, so that the voltage of a green power grid is unstable (insufficient electricity is used in a peak and too much electricity is used in a valley), and the unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' is possibly caused by insufficient electricity demand or insufficient power grid receiving capability.

To solve the problem of insufficient power demand or insufficient power grid acceptance, an energy storage device must be relied on. The energy storage device converts the electric energy into other forms of energy through physical or chemical means to store the energy, the energy stored by the energy storage device is converted into the electric energy to be released when needed, in short, the energy storage device is similar to a large-scale 'charge pal', when the light energy and the wind energy are sufficient, the electric energy is stored, and the stored electric energy is released when needed.

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

Taking a household energy storage scenario in a user side energy storage as an example, fig. 1 shows a household energy storage system, where the household energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, a household appliance, etc.), and the energy storage device 100 is a small energy storage box, and may be installed on an outdoor wall by a wall hanging manner. Specifically, the power conversion device 200 may convert solar energy into electric energy during the low electricity price period, and store the electric energy by the energy storage device 100, and then supply the electric energy to the consumer load 300 for use during the peak electricity price period, or supply the electric energy to the consumer load 300 for use during the power outage/power failure period of the power grid.

In combination with the above-mentioned case of performing energy storage by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one group of chemical batteries, and chemical elements in the chemical batteries are used as an energy storage medium, so as to implement a charging and discharging process through chemical reaction or change of the energy storage medium. In short, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric quantity stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or is transferred to a place where the electric quantity is short for use.

Taking the energy storage device as a lithium battery as an example, the lithium battery is used as a new energy battery, has the advantages of high energy density, long cycle life, good safety, environmental protection and the like, and is widely applied. As the demand for lithium batteries increases, the performance requirements of the lithium batteries in all aspects are increasing, especially with respect to cycle performance and safety performance.

In the related art, a lithium battery is generally composed of an end cap unit, an electrode assembly, and a case. The actual production process is that an end cover unit, an electrode assembly and a shell are respectively manufactured, then a metal adapter is used for respectively welding electrode columns of the end cover unit and electrode lugs of the electrode assembly, then the electrode assembly is placed in the shell, and then the end cover unit is used for covering an opening of the shell and then welded and sealed, so that a basic structure of the lithium battery is formed. Then, the electrolyte is injected manually through the electrolyte injection Kong Jiazhu arranged on the top cover of the battery, and the electrolyte injection hole is welded and sealed after the completion.

In the recycling process of the lithium battery, gas is generated due to various reasons such as decomposition of electrolyte, exceeding of moisture in a shell and the like, so that the cycle life and the rate performance are deteriorated; and along with the increase of gas in the shell, too much lithium ions are easily released on the surface of the pole piece of the electrode assembly, dendritic crystals are formed in the long time, and when the dendrites grow to a certain length, the diaphragm is easily pierced, so that short circuit occurs in the lithium battery, and the safety performance is greatly reduced.

Disclosure of Invention

One main object of the present application is to provide an energy storage device and electric equipment capable of absorbing harmful gases.

In order to achieve the purposes of the application, the application adopts the following technical scheme:

according to one aspect of the present application, there is provided an energy storage device comprising:

a housing including a receiving chamber having an opening;

an electrode assembly accommodated in the accommodation chamber;

an end cap unit sealing an opening of the accommodating chamber;

the metal adapter comprises a tray body and a convex part, wherein the tray body is provided with a first surface and a second surface which are opposite, the convex part is provided with a containing cavity, the tray body is positioned between the electrode assembly and the end cover unit, the first surface of the tray body is connected with the electrode assembly, the convex part is respectively connected with the second surface of the tray body and the end cover unit, and the containing cavity of the convex part is communicated with the containing cavity;

and the getter is accommodated in the accommodating cavity and used for absorbing gas generated in the working process of the energy storage device.

In the application, the accommodating cavity for accommodating the getter is formed in the convex part of the metal adapter, and the accommodating cavity is communicated with the accommodating cavity of the energy storage device, so that harmful gas generated in the working process of the energy storage device can be absorbed by the getter in the accommodating cavity, the influence of the harmful gas on the performance of the energy storage device is avoided, and meanwhile, the safety of the energy storage device in use is improved; in addition, the convex part included in the metal adapter is combined with the accommodating cavity, so that the expansion of the volume size of the energy storage device due to the arrangement of the air suction substance is avoided, and the space utilization rate of the metal adapter is improved.

Optionally, the protrusion has a first end facing the tray body, and the accommodating cavity is a groove formed from an end surface of the first end concavely facing the end cover unit and opening toward the tray body;

the side wall of the first end part of the convex part and/or the tray body is/are provided with a gas vent communicated with the space in the groove and the accommodating cavity.

In this application, through set up the recess at the first end of convex part orientation disk body to form and hold the chamber, and through the hole of wandering on recess cell wall and/or the disk body, realize holding the intercommunication in chamber and holding chamber, realize the absorption of inspiration material to harmful gas.

Optionally, the disk body has a plurality of weld beads, each of the weld beads extending in a radial direction of the disk body and protruding from the first surface of the disk body, the plurality of weld beads being uniformly spaced around the protrusion.

In this application, through setting up a plurality of welding beads, and every welding bead protrusion disk body's first surface to be convenient for form the gas passage between disk body's first surface and electrode assembly, the harmful gas of being convenient for is absorbed by the getter material along the gas hole of walking on the disk body.

Optionally, the convex portion includes a body portion and at least one extension integrally formed with the body portion;

the extending parts are positioned between two adjacent welding beads and extend along the radial direction of the disc body, and the containing cavities are distributed on the body part and the extending parts.

In this application, on the basis of body portion, set up with body portion integrated into one piece's extension to increase the whole region of convex part, and then under the circumstances of holding the chamber and distributing on body portion and extension, can increase the cavity space that holds the chamber, so be convenient for set up the getter material of great volume, improve the inspiration volume to harmful gas.

Optionally, the protrusion comprises a plurality of extensions spaced and evenly distributed along the circumference of the body portion.

In this application, through setting up a plurality of evenly distributed's extension, be convenient for more even absorption harmful gas in the circumference of disk body, guarantee the effect of breathing in.

Optionally, the extension is in a fan-shaped structure.

In this application, set up the extension and be fan-shaped structure, can guarantee that the extension has bigger region to further improve the connection effect of convex part and end cover unit.

Optionally, the convex part comprises a plurality of grid plates which are arranged at intervals;

each grid plate is provided with a through hole or a notch penetrating along the thickness direction of the grid plate, and the getter material is penetrated in a containing cavity formed by a plurality of through holes or notches formed by a plurality of grid plates.

In this application, the holding chamber that the through-hole or breach constitute on a plurality of grid plates can form the passageway of wanting to walk through the clearance between arbitrary adjacent two grid plates, is convenient for improve the intercommunication area that holds chamber and holding chamber to be convenient for improve the air suction efficiency of getter material.

Optionally, the end cap unit has a mounting hole, and the protrusion has a second end facing away from the tray body and a step surface;

the second end portion passes through the mounting hole, and the step surface abuts against a surface of the end cap unit facing the electrode assembly.

In the application, the second end part of the convex part, which is opposite to the disc body, passes through the mounting hole of the end cover unit, so that the seam between the end cover unit and the second end part of the convex part is convenient to weld, and the welding effect is improved; in addition, the step of the convex part faces the support of the end cover unit, and a buffer cavity can be formed between the tray body and the end cover unit, so that the circulation of electrolyte and harmful gas on two sides of the tray body in the thickness direction is facilitated, and meanwhile, the buffer space of the harmful gas is increased when the energy storage device is out of control.

Optionally, the metal adaptor is provided with a liquid injection hole penetrating through the convex part and the tray body in sequence along the thickness direction of the tray body, and the accommodating cavity is an annular groove surrounding the liquid injection hole.

In this application, through set up annotate the liquid hole on the metal adaptor, avoided the setting of annotating the liquid hole on the end cover unit to simplified the manufacturing process of end cover unit, improved the multifunctionality of metal adaptor.

Optionally, the getter material is provided with a solid-phase inert plugging agent coated on the outermost layer, or the accommodating cavity is internally provided with a liquid-phase inert plugging agent, and the melting temperature of the inert plugging agent is not less than 46 ℃ and not more than 58 ℃.

In the application, the inert plugging agent coated on the outermost layer can prevent the getter material from absorbing harmful gases generated in the formation stage of the energy storage device, and simultaneously ensure the getter material to absorb the generated harmful gases in the charge-discharge stage of the energy storage device, so that the reliability of the getter material is improved.

According to an aspect of the present application, there is provided an electric device, where the electric device includes the energy storage device according to the above aspect, and the energy storage device supplies power to the electric device.

In the application, the electric equipment can improve the working stability of the electric equipment and reduce the potential safety hazard of the electric equipment in the working process.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram of a household energy storage system according to the related art.

Fig. 2 is a schematic cross-sectional structure of an energy storage device according to an exemplary embodiment.

Fig. 3 is an enlarged schematic view of the area a of the energy storage device shown in fig. 2.

Fig. 4 is a schematic diagram of an exploded structure of a getter material according to an exemplary embodiment.

Fig. 5 is a schematic axial side structural view of a metal adapter according to an exemplary embodiment.

Fig. 6 is an exploded view of the metal adapter shown in fig. 5.

Fig. 7 is a schematic axial side structural view of another metal adapter according to an exemplary embodiment.

Fig. 8 is an exploded view of the metal adapter shown in fig. 7.

Wherein reference numerals are as follows:

100. an energy storage device; 200. an electric energy conversion device; 300. user load;

10. a housing; 20. an electrode assembly; 30. an end cap unit; 40. a metal adapter; 50. a getter material;

11. a receiving chamber; 21. a central through hole; 31. a mounting hole;

41. a tray body; 42. a convex portion; 43. a liquid injection hole;

411. a first surface; 412. a second surface; 413. an air hole is formed; 414. welding;

421. a groove; 422. a body portion; 423. an extension; 424. a first end; 425. a second end; 426. a step surface;

51. a getter; 52. a cotton pad; 53. a ventilation pad; 54. inert blocking agent.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

The present embodiments provide an energy storage device 100, and the energy storage device 100 may be, but is not limited to, a single battery, a battery module, a battery pack, a battery system, and the like. For the single battery, it may be a lithium ion secondary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the single battery may be a cylinder.

Next, the energy storage device 100 is explained in detail using the energy storage device 100 as a cylindrical unit cell as an example.

Fig. 2 illustrates a schematic structural diagram of an energy storage device 100 according to an embodiment of the present application. As shown in fig. 2, the energy storage device 100 includes: a housing 10 including a receiving chamber 11 having an opening; an electrode assembly 20 accommodated in the accommodation chamber 11; an end cap unit 30 sealing the opening of the accommodating chamber 11.

Wherein, the housing 10 may have a cylindrical structure with an opening at one end, and the energy storage device 100 includes an end cap unit 30 to be capable of insulating and sealing the opening of the housing 10; of course, the housing 10 may also have a cylindrical structure with two open ends, where the energy storage device 100 includes one end cap unit 30 and one cover plate, or includes two end cap units 30, such that one end cap unit 30 and one cover plate, or the two end cap units 30 can respectively perform insulation sealing on the two openings of the housing 10.

The end cover unit 30 comprises an end cover body and an electrode terminal, wherein the electrode terminal is arranged on the end cover body in a penetrating way, one end of the electrode terminal is connected with the electrode assembly 20, and the other end of the electrode terminal is exposed outside the battery shell 10 to serve as an output end of the single battery; the end cover body is provided with an explosion-proof valve and/or a liquid injection hole 43, the explosion-proof valve is used for discharging harmful gas in the accommodating cavity 11 to improve the use safety of the energy storage device 100, and the liquid injection hole 43 is used for injecting electrolyte into the accommodating cavity 11 of the energy storage device 100.

The electrode assembly 20 includes a positive plate, a negative plate and a separator, wherein the positive plate, the negative plate and the separator are stacked, and the separator is located between the positive plate and the negative plate. The positive electrode tab and the negative electrode tab are positioned at different ends of the electrode assembly 20, and one of the positive electrode tab and the negative electrode tab is connected with an electrode terminal included in the cap unit 30 while the other is connected with the bottom of the case 10 or an electrode terminal included in the other cap unit 30 to achieve output of electric power of the electrode assembly 20 through the electrode terminal of the cap unit 30 and the bottom of the case 10 or through the electrode terminals of both cap units 30.

In addition, as shown in fig. 2, the energy storage device 100 further includes a metal adaptor 40, and the metal adaptor 40 is used to connect the electrode assembly 20 and the end cap unit 30, so as to ensure that the electric energy of the electrode assembly 20 can be outputted.

During the use of the energy storage device 100, harmful gas is generated inside the energy storage device 100, and the harmful gas gathers in the accommodating cavity 11, which easily causes excessive pressure to cause swelling of the energy storage device 100, and if the pressure increases to a critical value, an explosion-proof valve of the energy storage device 100 is triggered, so that the energy storage device 100 fails. In addition, the harmful gas generated by the energy storage device 100 is very easy to cause the deterioration of the cycle life and the rate capability, and along with the increase of the harmful gas, too many lithium ions are easily dissociated on the surface of the pole piece of the electrode assembly 20, so that the short circuit occurs in the energy storage device 100, and the safety performance is greatly reduced.

For this purpose, the present application proposes an energy storage device 100, as shown in fig. 2, the energy storage device 100 comprising a metal adapter 40 provided with a housing cavity capable of housing a getter substance 50. In this way, the getter material 50 in the accommodating chamber sucks the harmful gas in the accommodating chamber 11, thereby avoiding the swelling of the energy storage device 100, and reducing the cycle life and the deterioration of the rate capability of the energy storage device 100.

The metal adapter 40 included in the energy storage device 100 of the present application is explained in detail below.

As shown in fig. 3, the metal adaptor 40 includes a plate 41 and a protrusion 42, the plate 41 has a first surface 411 and a second surface 412 opposite to each other, the protrusion 42 has a receiving chamber (not shown in the drawing), the plate 41 is located between the electrode assembly 20 and the cap unit 30, the first surface 411 of the plate 41 is connected to the electrode assembly 20, the protrusion 42 is connected to the second surface 412 of the plate 41 and the cap unit 30, respectively, and the receiving chamber of the protrusion 42 is in communication with the receiving chamber 11. The energy storage device 100 further includes a getter material 50, and the getter material 50 is accommodated in the accommodating cavity and is used for absorbing gas generated during the operation of the energy storage device 100.

In this embodiment, the accommodating cavity for accommodating the getter material 50 is disposed on the protrusion 42 of the metal adaptor 40, and the accommodating cavity is communicated with the accommodating cavity 11 of the energy storage device 100, so that the harmful gas generated in the working process of the energy storage device 100 can be absorbed by the getter material 50 in the accommodating cavity, thereby avoiding the influence of the harmful gas on the performance of the energy storage device 100, and improving the safety of the energy storage device 100 during use; in addition, the protrusion 42 included in the metal adaptor 40 is combined with the accommodating cavity, so that the expansion of the getter material 50 to the size of the energy storage device 100 is avoided, and the space utilization rate of the metal adaptor 40 is improved. In addition, in this embodiment, through setting up the accommodation cavity on the convex part 42, be convenient for when energy storage device 100 falls or collide, the hollow energy-absorbing structure that forms through the accommodation cavity absorbs the deformation stress that energy storage device 100 produced because of the extrusion in the direction of height, avoids the deformation profit that the extrusion produced to concentrate on electrode assembly 20 entirely, leads to electrode assembly 20 to take place the short circuit condition that damage etc. arouses because of the extrusion.

The getter material 50 mainly includes a getter 51 having a granular structure, and the getter 51 may include various types of grains to absorb various types of gases among the harmful gases, thereby improving the reliability of the getter 51.

Illustratively, the getter 51 may include carbon-based particles, such as activated carbon particles, carbon nanotubes, to absorb carbon dioxide from the harmful gases; the getter 51 may further include hydroxide particles of alkali metal or alkaline earth metal to absorb carbon dioxide in the harmful gas; the getter 51 may further include potassium permanganate particles to absorb alkane gases from the harmful gases; the getter 51 may also include zirconium vanadium iron ternary alloy particles to absorb oxygen from the harmful gases; cobalt oxide particles, copper oxide particles, potassium permanganate particles, etc. may be further included in the getter 51 to absorb carbon monoxide in the harmful gas, and magnesium oxide particles may be further included in the getter 51 to absorb hydrofluoric acid in the harmful gas.

When the getter 51 includes metal-containing particles (such as alkali metal or alkaline earth metal hydroxide particles, cobalt oxide particles, and copper oxide particles), in order to avoid leakage of the metal-containing particles to the electrode assembly 20 of the energy storage device 100 and thus to avoid shorting of the electrode assembly 20, the metal-containing particles are generally disposed as an inner structural layer, and a structural coating layer (such as a structural coating layer formed of carbon-based particles) is disposed to encapsulate the inner structural layer, and the particles after leakage do not cause shorting of the electrode assembly 20.

Optionally, as shown in fig. 4, the getter material 50 includes a cotton pad 52 (such as a magic pad) having a pore structure, and the getter 51 having a granular structure is filled in the pore structure of the cotton pad 52, so as to ensure stability of the getter 51 and prevent the getter 51 from being broken.

Optionally, as shown in fig. 4, the getter material 50 further includes a ventilation pad 53 (such as asbestos, flame retardant cotton, etc.), and the getter 51 is clamped between the two layers of ventilation pads 53, so, by setting the ventilation pad 53, not only the absorption of harmful gas by the getter 51 can be ensured, but also the buffering and vibration reduction effect can be realized, and the situation that the getter 51 is broken due to vibration is avoided.

Because the getter material 50 is provided in a multi-layer structure and has a buffering and damping effect, deformation stress of the energy storage device 100 in the height direction due to extrusion is effectively absorbed by the getter material 50 in the accommodating cavity, thereby further improving structural stability and cycle performance of the energy storage device 100.

In addition, in the energy storage device 100, from the production to the use, the harmful gas is generated in the formation stage, and the harmful gas is generated in the charging and discharging process, and for the harmful gas generated in the formation stage, the corresponding suction device is generally used to suck along the liquid injection hole 43, so that only the harmful gas generated in the charging and discharging process can affect the performance of the energy storage device 100. In addition, in the formation stage, the current collector including the getter material 50 is already assembled in the energy storage device 100, and in order to avoid the getter material 51 included in the getter material 50 from absorbing the harmful gases generated during the formation stage, in some embodiments, as shown in fig. 4, the getter material 50 has a solid phase inert blocking agent 54 coated on the outermost layer, or has a liquid phase inert blocking agent 54 in the accommodating cavity 11, and the melting temperature of the inert blocking agent 54 is not less than 46 ℃ and not more than 58 ℃.

Because the temperature of the energy storage device 100 in the formation stage is approximately 45 ℃ (less than 46 ℃), the inert plugging agent 54 at the outermost layer is in a solid phase, so that the getter material 50 is wrapped, and the harmful gas generated in the formation stage is prevented from being absorbed by the getter 51; the temperature of the energy storage device 100 during charging and discharging is approximately 60 degrees celsius (greater than 58 degrees celsius), and at this time, the inert plugging agent 54 at the outermost layer is melted into a liquid phase and deposited in the accommodating cavity 11, so as to ensure that the harmful gas generated during the charging and discharging stage can be absorbed by the getter 51. In this way, the inert blocking agent 54 at the outermost layer can prevent the getter 51 from absorbing the generated harmful gas in the formation stage, and can ensure the absorption of the generated harmful gas in the charge-discharge stage, thereby improving the reliability of the getter material 50.

The coating layer of the outermost layer of the getter material 50 may be selected from inert phase change materials such as paraffin, wax acid, polyethylene wax, etc., so as to avoid side reactions between the inert phase change materials and the electrolyte, water, etc. in the energy storage device 100, thereby negatively affecting the energy storage device 100.

It should be noted that the specific shape of the getter material 50 may be set in combination with the structure of the accommodating cavity on the protrusion 42, for example, the getter material 50 has a circular structure, a ring structure, or a special-shaped structure. Illustratively, as shown in fig. 6, the receiving cavity defined by the recess 421 is an annular groove surrounding the filling hole 43, and the getter material 50 is an annular structure matching the annular groove.

In this embodiment, the protruding portion 42 and the tray 41 may be in an integral structure, so as to reduce the number of structural members included in the metal adaptor 40, and facilitate improving the assembly efficiency of the energy storage device 100; of course, a split structure is also possible.

The convex portion 42 may be centrally disposed on the disc 41, so that when the convex portion 42 is fixedly connected with the end cap unit 30, it is convenient to determine the position of the end cap unit 30 welded with the convex portion 42, and the condition of cold joint is avoided, thereby improving the welding effect and efficiency. Taking the example in which the electrode assembly 20 is formed with the center through-hole 21, there is a region where the convex portion 42 overlaps the center through-hole 21 in the thickness direction of the disk 41. Of course, the protruding portion 42 may be provided eccentrically on the disk 41, as long as the getter material 50 accommodated in the accommodating chamber of the protruding portion 42 can absorb harmful gas, and the embodiment of the present invention is not limited thereto.

When the protrusion 42 and the tray 41 are in an integral structure, the opening of the accommodating cavity of the protrusion 42 may be located on the side wall of the protrusion 42, and at this time, the opening of the accommodating cavity realizes the communication between the accommodating cavity and the accommodating cavity 11 of the energy storage device 100; or the opening of the accommodating cavity is positioned on the end face of the convex part 42 facing the tray 41, and the tray 41 is provided with an opening for communicating the accommodating cavity with the accommodating cavity 11, at this time, the opening of the tray 41 realizes the communication between the accommodating cavity and the accommodating cavity 11 of the energy storage device 100, and a thicker getter material 50 can be arranged to improve the absorbable air quantity of the getter material 50; still alternatively, the opening of the accommodating chamber provided in the convex portion 42 is located at the end surface of the convex portion 42 facing away from the tray 41. And the end surface of the protruding part 42 facing away from the tray 41 abuts against the end surface of the end cover unit 30 facing the electrode assembly 20, at this time, the side wall of the protruding part 42 has a gas vent 413 to realize communication between the accommodating cavity and the accommodating cavity 11 of the energy storage device 100.

In the case that the opening of the accommodating cavity is located on the side wall of the protruding portion 42, in order to achieve the limit of the getter material 50 in the accommodating cavity, the getter material 50 is prevented from falling from the accommodating cavity, and the opening size of the accommodating cavity is smaller than the internal size of the accommodating cavity (for example, the accommodating cavity is in a truncated cone or a prismatic table structure with the opening end as a small diameter end). At this time, when assembling the getter material 50, the getter material 50 may be pressed to cause the getter material 50 to be deformed so that the denatured getter material 50 can be assembled into the receiving chamber, and then the possibility that the getter material 50 falls out of the receiving chamber is restricted due to the small size of the opening of the receiving chamber.

Of course, in addition to setting the opening size of the accommodating chamber smaller than the internal size of the accommodating chamber, a blocking member may be separately provided at the opening of the accommodating chamber, so as to achieve the limitation of the getter substance 50 in the accommodating chamber by the blocking member.

For the case that the opening of the accommodating cavity is located on the end face of the protrusion 42 facing the disc 41, and the disc 41 has an opening, in order to realize the limit of the getter material 50 in the accommodating cavity, to avoid the getter material 50 falling from the accommodating cavity, etc., the opening size of the accommodating cavity is smaller than the internal size of the accommodating cavity (for example, the accommodating cavity is a truncated cone or a prismatic table structure with the opening being the top), or the size of the opening on the disc 41 is smaller than the opening size of the accommodating cavity. At this time, when assembling the getter material 50, the getter material 50 may be pressed to cause the getter material 50 to be deformed so that the denatured getter material 50 can be assembled into the receiving chamber, and then the possibility that the getter material 50 falls out of the receiving chamber is restricted due to the small size of the opening of the receiving chamber.

Of course, in addition to setting the size of the opening of the accommodating chamber smaller than the internal size of the accommodating chamber, or setting the size of the opening of the tray 41 smaller than the size of the opening of the accommodating chamber, a blocking member may be separately provided at the opening of the tray 41 to achieve the limitation of the getter material 50 in the accommodating chamber.

When the boss 42 and the tray 41 are of a split type design, as shown in fig. 5 or 7, the boss 42 has a first end 424 facing the tray 41 and a second end 425 facing the end cap unit 30, and the first end 424 of the boss 42 and the tray 41 may be fixedly connected by welding.

In some embodiments, as shown in fig. 6 or 8, the accommodation chamber is a groove 421 formed recessed from the end face of the first end 424 toward the end cap unit 30 and opened toward the tray 41.

Wherein, the side wall of the first end 424 of the convex part 42 and/or the tray 41 has a gas-passing hole 413 communicating with the space in the groove 421 and the accommodating chamber 11.

In this way, the recess 421 is disposed at the first end 424 of the protrusion 42 facing the tray 41, so as to form a containing cavity, and the containing cavity is communicated with the containing cavity 11 of the housing 10 through the wall of the recess 421 and/or the air outlet 413 on the tray 41, so that the absorbing of the getter material 50 in the containing cavity to the harmful gas is realized.

The air passing holes 413 on the side wall of the groove 421 may be circular holes distributed at intervals along the circumferential direction of the protrusion 42, or may be circular arc holes extending along the circumferential direction of the protrusion 42, and the air passing holes 413 on the disc 41 may be circular holes in the area facing the groove 421 on the disc 41, or may be stripe holes or circular arc holes in the area facing the groove 421 on the disc 41, or the like. For the air outlet 413 of the round hole, the integral structure of the convex part 42 and the tray 41 is convenient to improve; in the case of the air-passing holes 413 of the strip-shaped holes or the circular arc holes, the communication area between the accommodating chamber 11 and the accommodating chamber 11 of the energy storage device 100 can be increased, so that the air-sucking effect of the air-sucking material 50 can be improved.

Further, the tray 41 further has a recess area with an opening on the second surface 412, and the size of the opening of the recess area on the tray 41 is smaller than or equal to the size of the notch of the groove 421 on the protrusion 42, so that by the arrangement of the two grooves 421, the getter material 50 with a larger thickness (the size in the thickness direction of the tray 41) is arranged in the accommodating cavity, thereby improving the getter amount of the harmful gas. Since the opening size of the concave area on the tray 41 is smaller than or equal to the notch size of the groove 421 on the protrusion 42, it is convenient to ensure that the first end 424 of the protrusion 42 and the second surface 412 of the tray 41 have a larger contact area, so as to improve the stability of the connection between the protrusion 42 and the tray 41.

In other embodiments, the projection 42 includes a plurality of spaced apart louvers; each louver is formed with a through hole or a notch penetrating in the louver thickness direction, and the getter material 50 is penetrated into a receiving chamber formed by the through holes or the notches of the louver.

Therefore, when the getter material 50 is arranged in the accommodating cavity formed by the through holes or the gaps, the limit of the getter material 50 can be synchronously realized, and an air passage is formed through the gap between any two adjacent grid plates, so that the communication area between the accommodating cavity and the external space is conveniently increased, namely the exposed area of the getter material 50 in the accommodating cavity is effectively adjusted, and the getter efficiency of the getter material 50 is conveniently improved.

The grid plates can be distributed at intervals along the linear direction, and at the moment, the containing cavity formed by the through holes or the gaps of the grid plates is of a linear structure; or the grid plates can be distributed at intervals along the circumferential direction, and the containing cavity formed by the through holes or the gaps of the grid plates is of an arc-shaped structure.

In the present embodiment, when the second end 425 of the protrusion 42 is connected to the end cap unit 30, the end face of the second end 425 of the protrusion 42 may abut against the surface of the end cap unit 30 facing the electrode assembly 20, and in this case, the welding between the second end 425 of the protrusion 42 and the end cap unit 30 may be directly performed by penetration welding.

Of course, as shown in fig. 3, the end cap unit 30 may have the mounting hole 31, and the convex portion 42 may have a stepped surface 426 facing away from the tray 41; the second end 425 of the boss 42 passes through the mounting hole 31, and the stepped surface 426 of the boss 42 abuts against the surface of the end cap unit 30 facing the electrode assembly 20. At this time, the welding of the second end 425 of the protrusion 42 and the end cap unit 30 may be performed by seam welding the side wall of the second end 425 of the protrusion 42 and the hole edge of the mounting hole 31 of the end cap unit 30.

For both connection methods, when the end surface of the second end 425 of the protrusion 42 or the step surface 426 of the protrusion 42 is in contact with the surface of the end cap unit 30 facing the electrode assembly 20, a buffer cavity can be formed between the tray 41 and the end cap unit 30, thereby facilitating the circulation of the electrolyte and the harmful gas on both sides of the tray 41 in the thickness direction of the tray 41 and increasing the buffer space of the harmful gas.

Alternatively, in the case where the second end 425 of the protrusion 42 passes through the mounting hole 31 of the end cap unit 30, and in this case, in combination with the case where the receiving cavity in the protrusion 42 is the groove 421, as shown in fig. 5 and 6, the metal adaptor 40 has the liquid injection hole 43 penetrating the protrusion 42 and the disc 41 in order in the thickness direction of the disc 41, and the groove 421 surrounding the receiving cavity is an annular groove surrounding the liquid injection hole 43. In this way, by providing the liquid injection hole 43 on the metal adapter 40, the provision of the liquid injection hole 43 on the end cap unit 30 is avoided, thereby simplifying the manufacturing process of the end cap unit 30 and improving the versatility of the metal adapter 40.

In the present embodiment, the first surface 411 of the tray 41 faces the electrode assembly 20 and is connected (ultrasonic welded) to the electrode assembly 20. In order to enhance the connection effect of the disk 41 with the electrode assembly 20, however, in some embodiments, as shown in fig. 7 and 8, the disk 41 has a plurality of beads 414, each bead 414 extending in the radial direction of the disk 41 and protruding from the first surface 411 of the disk 41, the plurality of beads 414 being uniformly spaced around the protrusion 42.

In this manner, by providing a plurality of beads 414, each bead 414 protruding from the first surface 411 of the tray 41, it is convenient to form a gas passage between the first surface 411 of the tray 41 and the electrode assembly 20, so that the harmful gas is absorbed by the getter material 50 along the gas passage 413 on the tray 41.

For example, a plurality of welding beads 414 protruding from the first surface 411 of the tray 41 may be formed on the second surface 412 of the tray 41 by pressing, and at this time, as shown in fig. 7, the welding beads 414 are formed in a recess on the second surface 412 of the tray 41, and as shown in fig. 8, are formed in a protrusion on the first surface 411 of the tray 41. Since the welding beads 414 protrude from the first surface 411 of the tray body 41, it is convenient to reduce the flatness requirement for the tray body 41 when ultrasonic welding of a plurality of welding beads 414 and the electrode assembly 20 is achieved, so that the connection effect of the tray body 41 and the electrode assembly 20 can be effectively improved.

Wherein, the tray 41 has a through hole between two adjacent weld beads 414, which is convenient for the circulation of electrolyte and harmful gas on two sides of the tray 41 in the thickness direction of the tray 41.

Alternatively, in combination with the above-described case where the receiving cavity on the convex portion 42 is the groove 421 at the first end portion 424, as shown in fig. 7 and 8, the convex portion 42 includes a body portion 422 and at least one extension portion 423 integrally formed with the body portion 422; the extension portion 423 is located between two adjacent weld beads 414 and extends in the radial direction of the disc 41, and the accommodating cavities are distributed on the body portion 422 and the extension portion 423, that is, a part of the groove 421 enclosing the accommodating cavity is located on the body portion 422 and a part of the groove is located on the extension portion 423.

In this way, on the basis of the body portion 422, the extension portion 423 integrally formed with the body portion 422 is provided to increase the overall area of the protruding portion 42, and thus, in the case that the accommodating cavities are distributed on the body portion 422 and the extension portion 423, the cavity space of the accommodating cavities can be increased, so that the getter material 50 with a larger volume is conveniently provided, and the amount of gettering harmful gas is improved. In addition, the connection area between the convex portion 42 and the disk 41 can be effectively increased outside the entire region of the convex portion 42, so that the stability of the connection between the convex portion 42 and the disk 41 can be ensured.

In combination with the above-described case where the protrusion 42 has the stepped surface 426 facing away from the tray 41, as shown in fig. 7, the entire surface of the extension 423 may form a part of the stepped surface 426, thereby increasing the supporting area of the protrusion 42 to the end cap unit 30, and thus increasing the supporting effect to the end cap unit 30.

Alternatively, as shown in fig. 7 or 8, the extension portion 423 may have a fan-shaped structure, or of course, the extension portion 423 may have a rectangular structure, which is not limited in this embodiment.

With respect to the extension portion 423 of the fan-shaped structure, the fan-shaped structure is a fanlike structure surrounded by two concentric circular arc sides and two radially extending side edges due to the restriction of the body portion 422. In addition, the extension portion 423 is provided in a fan-shaped structure, so that the extension portion 423 can have a larger area, thereby further improving the connection effect of the boss and the battery case 10.

The embodiment of the application also provides electric equipment which can be energy storage equipment, vehicles, energy storage containers and the like. The electric equipment comprises the energy storage device 100 in the embodiment, and the energy storage device 100 supplies power for the electric equipment. So, in combination with the energy storage device 100, the electric equipment of the application can improve the working stability of the electric equipment and reduce the potential safety hazard of the electric equipment during working.

In this application, the terms "first," "second," "third," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present application, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or unit in question must have a specific orientation, be configured and operated in a specific orientation, and therefore, should not be construed as limiting the present application.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments. In this application, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An energy storage device (100), comprising:

a housing (10) comprising a receiving chamber (11) having an opening;

an electrode assembly (20) accommodated in the accommodation chamber (11);

an end cap unit (30) sealing the opening of the accommodation chamber (11);

a metal adapter (40) comprising a disc (41) and a protrusion (42), the disc (41) having a first surface (411) and a second surface (412) opposite to each other, the protrusion (42) having a receiving cavity, the disc (41) being located between the electrode assembly (20) and the end cap unit (30), and the first surface (411) of the disc (41) being connected to the electrode assembly (20), the protrusion (42) being connected to the second surface (412) of the disc (41) and the end cap unit (30), respectively, the receiving cavity of the protrusion (42) being in communication with the receiving cavity (11);

and the getter material (50) is accommodated in the accommodating cavity and is used for absorbing gas generated in the working process of the energy storage device (100).

2. The energy storage device (100) according to claim 1, wherein the protrusion (42) has a first end (424) facing the tray (41), and the accommodation chamber is a recess (421) formed concavely from an end face of the first end (424) toward the end cap unit (30) and opened toward the tray (41);

the side wall of the first end part (424) of the convex part (42) and/or the tray body (41) is provided with an air vent (413) which is communicated with the space in the groove (421) and the accommodating cavity (11).

3. The energy storage device (100) of claim 2, wherein the tray (41) has a plurality of beads (414), each bead (414) extending radially of the tray (41) and protruding from the first surface (411) of the tray (41), the plurality of beads (414) being evenly spaced around the protrusion (42).

4. The energy storage device (100) of claim 3, wherein the protrusion (42) comprises a body portion (422) and at least one extension (423) integrally formed with the body portion (422);

the extension portion (423) is located between two adjacent welding beads (414) and extends along the radial direction of the disc body (41), and the accommodating cavities are distributed on the body portion (422) and the extension portion (423).

5. The energy storage device (100) of claim 4, wherein the protrusion (42) comprises a plurality of extensions (423), the plurality of extensions (423) being spaced apart and evenly distributed along the circumference of the body portion (422).

6. The energy storage device (100) of claim 4, wherein the extension (423) is in a fan-shaped configuration.

7. The energy storage device (100) of claim 1, wherein the protrusion (42) comprises a plurality of grid plates arranged in a spaced apart relationship;

each grid plate is provided with a through hole or a notch penetrating along the thickness direction of the grid plate, and the getter material (50) is penetrated in a containing cavity formed by a plurality of through holes or notches of the grid plates.

8. The energy storage device (100) according to any one of claims 2-6, wherein the end cap unit (30) has a mounting hole (31), the protrusion (42) having a second end (425) facing away from the disc (41) and a step surface (426);

the second end portion (425) passes through the mounting hole (31), and the step surface (426) abuts against a surface of the end cap unit (30) facing the electrode assembly (20).

9. The energy storage device (100) of claim 8, wherein the metal adaptor (40) has a liquid injection hole (43) penetrating through the protrusion (42) and the disc (41) in sequence along a thickness direction of the disc (41), and the receiving cavity is an annular groove surrounding the liquid injection hole (43).

10. The energy storage device (100) according to claim 1, wherein the getter material (50) has a solid phase inert plugging agent (54) coated on the outermost layer or wherein the receiving chamber (11) has a liquid phase inert plugging agent (54), the inert plugging agent (54) having a melting temperature of not less than 46 degrees celsius and not more than 58 degrees celsius.

11. A powered device, characterized in that the powered device comprises an energy storage device (100) according to any of the preceding claims 1-10, the energy storage device (100) powering the powered device.