CN115172998A - Secondary battery and method for manufacturing secondary battery - Google Patents

Abstract

Embodiments of the present invention provide a secondary battery and a method for manufacturing the secondary battery, which belong to the technical field of secondary batteries. The secondary battery includes a cell body and an adapter. The main body of the battery cell includes a plurality of pole pieces and a plurality of pole tabs, and the plurality of pole tabs are connected to the pole pieces in one-to-one correspondence and extend to the outside of the pole pieces. The adapter includes a pole connecting part and a pole connecting part that are connected to each other, and one end of the pole connecting part far away from the pole connecting part is bent towards the bottom and extends in the direction of the pole connecting part so as to be connected with the pole connecting part. form an installation space. At least one end of a part of the tab away from the pole piece is disposed in the installation space and fixedly connected with the tab connecting part. It can effectively shorten the length of the tab and improve the problem of contact short circuit between the tab and the electrode.

Description

Secondary battery, manufacturing method of secondary battery

technical field

The present invention relates to the field of secondary batteries, and in particular, to a secondary battery, a secondary battery and a method for manufacturing the secondary battery.

Background technique

In the secondary battery, the tabs of the electrodes are connected to the poles through adapters, so as to realize the output of electric energy in the electrodes.

However, the connection structure between the adapter and the tab of the existing secondary battery (eg, application publication number CN108428852A) is unreasonably designed, and the longer tab length is prone to short circuit and waste of raw materials.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a secondary battery, a secondary battery and a manufacturing method of the secondary battery, which can effectively save the length of the tab and improve the problem of short circuit caused by the tab.

The embodiments of the present invention are implemented as follows:

In a first aspect, an embodiment of the present invention provides a secondary battery, the secondary battery includes a battery cell body and an adapter;

The battery core body includes a plurality of pole pieces and a plurality of pole tabs, and the plurality of the pole tabs are connected to the plurality of the pole pieces and extend to the outside of the pole pieces;

The adapter includes a pole connecting part and a pole connecting part which are connected to each other, and one end of the pole connecting part away from the pole connecting part is bent toward the bottom and extends toward the direction of the pole connecting part , to form an installation space with the pole connecting part;

At least a part of one end of the tab away from the pole piece is disposed in the installation space, and is fixedly connected with the tab connecting portion.

In an optional implementation manner, the tab connecting portion is in a U-shaped structure, and the tab connecting portion includes a first segment, a second segment, and a bent segment, and the first segment and the second segment are disposed opposite to each other, and pass through the The bending sections are connected to each other, the first section, the second section and the bending section enclose the installation space, the end of the first section is connected with the pole connecting section, the The end of the second segment extends in the direction of the pole connecting portion.

In an optional embodiment, the tabs are connected to a side of the second segment close to the first segment by welding.

In an optional embodiment, the length of the second segment is less than half the thickness of the cell body, and part of the tabs are stacked in the middle of the cell body and face the second segment The end direction of the end is bent and extended into the installation space.

In an optional embodiment, the thickness of at least part of the tab connecting portion is smaller than the thickness of the pole connecting portion; and/or;

The pole piece connecting portion is provided with a bending groove along the width direction of the pole piece connecting portion.

In an optional implementation manner, the number of the cell main bodies includes two, two of the cell main bodies are arranged in layers, the number of the tab connecting parts includes two, and the two tab connecting parts are respectively connected with the pole connecting part, the pole lugs of the two battery core main bodies are respectively arranged in the installation space formed by the two pole lug connecting parts, and are respectively connected with the two pole lugs Department connection.

In an optional implementation manner, the tabs of the two battery core bodies are disposed opposite to each other, the two tab connecting parts are disposed on opposite sides of the pole connecting part, and the two pole connecting parts are disposed on opposite sides of the pole connecting part. One end of the ear connecting portion away from the pole connecting portion is bent toward the bottom, and both extend toward the pole connecting portion, forming an installation space with the pole connecting portion respectively.

In an optional implementation manner, the plurality of pole pieces of the two cell main bodies are stacked in the middle of the corresponding cell main bodies, and are respectively bent toward the outside of the cell main bodies, respectively. It extends into the installation space along the corresponding end of the tab connecting portion.

In an optional embodiment, the number of the adapters includes two, and some of the plurality of pole pieces are positive pieces, and another part of the pole pieces are negative pieces, and a plurality of the pole pieces are negative pieces. The part of the tabs connected to the positive electrode piece in the ear is connected to the pole piece connecting part of one of the adapters, and the part of the tabs connected to the negative electrode piece in the plurality of the tabs is connected to the pole piece connecting part of the adapter. The tab connecting portion of the other adapter is connected.

In a second aspect, the present invention also provides a method for manufacturing a secondary battery, the secondary battery includes a cell main body and an adapter, the cell main body includes a plurality of pole pieces and a plurality of tabs, a plurality of all The pole tabs are connected to a plurality of the pole pieces and extend to the outside of the pole pieces, and the adapter includes a pole connecting portion and a tab connecting portion that are connected to each other and are on the same plane;

The method includes:

stacking at least part of the tabs and connecting with the tab connecting part;

Bending the tab connecting part so that the tab connecting part is bent toward the bottom of the pole connecting part, and making the end of the tab connecting part face the direction of the pole connecting part extending, so that the part of the tab connected to the tab connecting part is located in the installation space formed between the tab connecting part and the pole connecting part;

The tabs connected to the tab connecting parts are bent so that the adapter is located above the battery core body.

In an optional embodiment, the number of the battery cell bodies includes two, and a part of the plurality of pole pieces of the two battery cell bodies is a positive electrode piece, and the other part is a negative electrode piece;

The number of the adapters includes two, each of the adapters has two tab connecting parts, and the two tab connecting parts are respectively connected on opposite sides of the pole connecting part, and the two tab connecting parts are on the same plane as the pole connecting parts;

The step of stacking at least part of the tabs and connecting with the tab connecting part includes:

All the tabs connected to the positive electrode sheet and all the tabs connected to the positive electrode sheet on each of the cell main bodies are respectively gathered and stacked on the corresponding cell main body. the middle of the;

Place the two battery core bodies on both sides of the two adapters respectively, and make the two battery core bodies connected to the positive electrode tabs after being stacked on top of each other. on the connecting parts of the two tabs of the connecting piece, and then the two tabs connecting the two battery core bodies and the positive electrode sheet are respectively stacked on the two poles of the other connecting piece. on the ear connection;

Connect the tabs of the two battery core bodies to the tab connection parts of the two adapters by welding;

Bending the tab connecting part so that the tab connecting part is bent toward the bottom of the pole connecting part, and making the end of the tab connecting part face the pole connecting part The step of extending in the direction of the tab so that the part of the tab connected to the tab connecting part is located in the installation space formed between the tab connecting part and the pole connecting part includes:

Bending the tab connecting parts of the two adapters one by one or at the same time, so that all the tab connecting parts of the two adapters are bent toward the bottom of the pole connecting part , and make all the ends of the tab connecting parts extend toward the direction of the pole connecting parts, so that the tabs connected to all the tab connecting parts are located at the tab connecting parts and in the installation space between the pole connecting parts;

The step of bending the tab connected to the tab connecting portion so that the adapter is located above the battery core body includes:

All the tabs connected to the two adapters are bent one by one or respectively, so that the two adapters are located above the main body of the battery cell.

The beneficial effects of the secondary battery and the method for manufacturing the secondary battery provided by the embodiments of the present invention include:

In the present application, one end of the tab connecting part away from the pole connecting part is bent toward the bottom and extending towards the pole connecting part to form an installation space with the pole connecting part, and part of the tab connecting part is kept away from the pole piece. One end of the electrode is arranged in the installation space, and is fixedly connected with the tab connecting part, so that the length of the tab can be shortened, and the bent tab connecting part will block the tab, thereby improving the contact between the tab and the pole piece to form a short circuit happened.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of the connection between a tab and an adapter in the prior art;

2 is a schematic structural diagram of a secondary battery provided by an embodiment of the present invention;

Fig. 3 is the sectional schematic diagram of A-A direction in Fig. 2;

4 is a schematic structural diagram of an adapter of a secondary battery provided in an embodiment of the present invention in an unbent state;

FIG. 5 is a schematic structural diagram of another perspective view of the adapter of the secondary battery provided in the embodiment of the present invention in an unbent state;

FIG. 6 is a schematic structural diagram of an adapter and a tab of a secondary battery during welding according to an embodiment of the present invention.

Icon: 100-secondary battery; 110-cell body; 111-pole piece; 113-pole lug; 130-adapter; 131-pole connection part; 133-pole lug connection part; 135-installation space; 137 - first segment; 139 - second segment; 141 - bent segment.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Referring to FIG. 1, the inventor found that when connecting the existing tabs and the adapter, the tabs must first be folded to the edge of the winding core, then bent inward and welded to the adapter. The length of the tab is It is relatively long, and when the top cover is installed, the contact between the tabs and the pole pieces of the winding core is easily short-circuited.

Referring to FIG. 2 and FIG. 3 , an embodiment of the present invention provides a secondary battery 100 . The secondary battery 100 includes a cell body 110 and an adapter 130 . The cell body 110 includes a plurality of pole pieces 111 and a plurality of pole tabs 113 , and the plurality of pole tabs 113 are connected to the pole pieces 111 in a one-to-one correspondence and protrude to the outside of the pole pieces 111 . The adapter 130 includes a pole connecting portion 131 and a tab connecting portion 133 that are connected to each other. One end of the tab connecting portion 133 away from the pole connecting portion 131 is bent toward the bottom thereof and extends toward the pole connecting portion 131. An installation space 135 is formed between the pole connecting portion 131 . At least one end of the tab 113 away from the pole piece 111 is disposed in the installation space 135 and is fixedly connected to the tab connecting portion 133 .

In this embodiment, one end of the tab connecting portion 133 away from the pole connecting portion 131 is bent toward the bottom and extending toward the pole connecting portion 131 to form an installation space 135 between the tab connecting portion 131 and the pole connecting portion 131 . One end of a part of the tab 113 away from the pole piece 111 is disposed in the installation space 135 and is fixedly connected with the tab connecting portion 133 so that the length of the tab 113 can be shortened, and the bent tab connecting portion 133 will be opposite to the tab 113 . By forming a shield, the occurrence of short circuit caused by the contact between the tab 113 and the pole piece 111 can be improved.

It should be noted that the battery core body 110 may be a roll core formed by stacking or winding positive electrode sheets, separators, and negative electrode sheets.

In this embodiment, the tab connecting portion 133 has a U-shaped structure, and the tab connecting portion 133 includes a first segment 137 , a second segment 139 and a bending segment 141 . The first section 137 and the second section 139 are arranged opposite to each other and are connected to each other by the bending section 141. The first section 137, the second section 139 and the bending section 141 enclose the installation space 135. The end of the first section 137 is connected to the The pole connecting portion 131 is connected, and the end of the second segment 139 extends toward the pole connecting portion 131 .

In this embodiment, the tab connecting portion 133 is set to a U-shaped structure, so that the tab 113 can be partially protected in the installation space 135 by the first segment 137 and the second segment 139 .

In this embodiment, the tab 113 is connected to the side of the second segment 139 close to the first segment 137 by welding.

In this embodiment, the tabs 113 are welded on the second segment 139 to facilitate the welding of the tabs 113 .

In this embodiment, the length of the second segment 139 is less than half the thickness of the cell body 110 , and part of the tabs 113 are stacked in the middle of the cell body 110 , and are bent and extended toward the end of the second segment 139 . into the installation space 135 .

Referring to FIG. 2 and FIG. 3 , in this embodiment, the thickness of the tab connecting portion 133 is smaller than the thickness of the pole connecting portion 131 .

In this embodiment, the thickness of the tab connecting portion 133 is set to be smaller than the thickness of the pole connecting portion 131 to facilitate bending of the tab connecting portion 133 .

In some embodiments of the present application, the connecting portion of the pole piece 111 is provided with a bending groove or a cutting line along the width direction of the connecting portion of the pole piece 111 , and the tab connecting portion 133 can be bent along the bending groove or cutting line. fold.

In this embodiment, the number of the cell main bodies 110 includes two, the two cell main bodies 110 are stacked, and the number of the tab connecting parts 133 includes two, and the two tab connecting parts 133 are respectively connected with the pole connecting parts 131 For connection, the tabs 113 of the two cell main bodies 110 are respectively disposed in the installation spaces 135 formed by the two tab connecting parts 133 , and are respectively connected to the two tab connecting parts 133 . Two tab connection parts 133 are provided so that the pole pieces 111 on the two cell main bodies 110 can be connected at the same time through one adapter 130 .

In this embodiment, the tabs 113 of the two battery core bodies 110 are disposed opposite to each other, the two tab connecting portions 133 are disposed on opposite sides of the pole connecting portion 131 , and the two tab connecting portions 133 are connected away from the pole. One end of the portion 131 is bent toward the bottom and extends toward the pole connecting portion 131 , and an installation space 135 is formed between the portion 131 and the pole connecting portion 131 respectively.

In this embodiment, the two tab connecting portions 133 are disposed on opposite sides, and both are bent and extended toward the center, so that the two battery core bodies 110 can be conveniently connected at the same time.

In this embodiment, the plurality of pole pieces 111 of the two cell main bodies 110 are stacked in the middle of the corresponding cell main bodies, and are respectively bent toward the outside of the cell main bodies 110 , respectively along the corresponding pole pieces. The end of the ear connecting portion 133 protrudes into the installation space 135 .

In this embodiment, the tabs 113 of the cell body 110 are stacked in the middle of the cell, which can shorten the length of the tabs 113 and make the tabs 113 on both sides symmetrical in length, which is convenient for cutting the tabs 113 .

Please refer to FIG. 2 and FIG. 3 , in this embodiment, the number of the adapters 130 includes two, some of the pole pieces 111 are positive pole pieces (not shown), and the other part of the pole pieces 111 are negative pole pieces Piece 111 (not shown in the figure), the portion of the plurality of tabs 113 connected to the positive electrode piece is connected to the connecting portion of the pole piece 111 of an adapter 130, and the portion of the plurality of electrode tabs 113 connected to the negative electrode piece 111 The tab 113 is connected to the tab connecting portion 133 of the other adapter 130 .

Referring to FIG. 4 , FIG. 5 and FIG. 6 , in this embodiment, by disposing two adapters 130 , the positive electrode and the negative electrode of the cell can be respectively connected.

The embodiment of the present invention further provides a method for manufacturing a secondary battery 100. The secondary battery 100 includes a cell main body 110 and an adapter 130. The cell main body 110 includes a plurality of pole pieces 111 and a plurality of tabs 113. The tabs 113 are connected to the pole piece 111 in a one-to-one correspondence and extend to the outside of the pole piece 111 . The adapter 130 includes a pole connecting portion 131 and a tab connecting portion 133 that are connected to each other and are on the same plane.

Methods include:

stacking at least part of the tabs 113 and connecting with the tab connecting portion 133;

The tab connecting portion 133 is bent so that the tab connecting portion 133 is bent toward the bottom of the pole connecting portion 131, and the end portion of the tab connecting portion 133 is extended toward the direction of the pole connecting portion 131, so as to allow the connection Part of the tab 113 of the tab connecting portion 133 is located in the installation space 135 formed by the tab connecting portion 133 and the pole connecting portion 131;

The tab 113 connected to the tab connecting portion 133 is bent so that the adapter 130 is located above the cell body 110 .

In this method, the tab 113 is first connected with the sheet-like adapter 130 , and then the adapter 130 is bent to form the installation space 135 , so as to improve the assembly efficiency and ensure the connection between the tab 113 and the adapter 130 . Connection strength and connection quality.

In this embodiment, the number of the battery cell main bodies 110 includes two, and a part of the plurality of tabs 113 of the two cell main bodies 110 is a positive electrode ear, and the other part is a negative electrode ear;

The number of adapters 130 includes two, and each adapter 130 has two tab connecting parts 133 , the two tab connecting parts 133 are respectively connected on opposite sides of the pole connecting part 131 , and the two tab connecting parts 133 are respectively connected. The connecting parts 133 are all on the same plane as the pole connecting parts 131;

The step of stacking at least part of the tabs 113 and connecting with the tab connecting portion 133 includes:

All the positive electrode tabs 113 and the negative electrode tabs 113 on each cell main body 110 are respectively gathered and stacked in the middle of the cell main body 110;

Place the two cell bodies 110 on both sides of the two adapters 130 respectively, and make the positive tabs 113 of the two cell bodies 110 stacked on top of one of the adapters 130 on the connecting parts of the two tabs respectively. 133, and then stack the negative tabs of the two battery core bodies 110 on the two tab connecting parts 133 of the other adapter 130;

The positive tabs 113 and the negative tabs 113 of the two cell bodies 110 are respectively connected to the tab connecting portions 133 of the two adapters 130 by welding;

The tab connecting portion 133 is bent so that the tab connecting portion 133 is bent toward the bottom of the pole connecting portion 131, and the end portion of the tab connecting portion 133 is extended toward the direction of the pole connecting portion 131, so as to allow the connection The steps of positioning part of the tabs 113 of the tab connecting portion 133 in the installation space 135 formed by the tab connecting portion 133 and the pole connecting portion 131 include:

Bend the tab connecting portions 133 of the two adapters 130 one by one or at the same time, so that all the tab connecting portions 133 of the two adapters 130 are bent toward the bottom of the pole connecting portion 131, and all the The end of the tab connecting portion 133 extends in the direction of the pole connecting portion 131 , so that the positive tab 113 and the negative tab 113 connected to the tab connecting portion 133 are located between the tab connecting portion 133 and the pole connecting portion 131 . In the installation space 135;

The steps of bending the tab 113 connected to the tab connecting portion 133 so that the adapter 130 is located above the cell body 110 includes:

The positive tabs 113 and the negative tabs 113 connected to the two adapters 130 are bent one by one or respectively, so that the two adapters 130 are both located above the cell body 110 .

In this embodiment, the two connecting pieces are first connected to the positive electrode tab 113 and the negative electrode tab 113 respectively and then bent, which can improve assembly efficiency and connection quality.

In this embodiment, the tabs 113 are connected to the second segment 139 by ultrasonic welding.

To sum up, the working principles and beneficial effects of the secondary battery 100 and the method for manufacturing the secondary battery 100 provided by the embodiments of the present invention include:

In the present application, one end of the tab connecting portion 133 away from the pole connecting portion 131 is bent toward the bottom and extending in the direction of the pole connecting portion 131 to form an installation space 135 with the pole connecting portion 131 . One end of the tab 113 away from the pole piece 111 is disposed in the installation space 135 and is fixedly connected with the tab connecting portion 133 so that the length of the tab 113 can be shortened, and the bent tab connecting portion 133 will form the tab 113 Therefore, the occurrence of short circuit caused by the contact between the tab 113 and the pole piece 111 can be improved.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A secondary battery is characterized by comprising a battery core main body and an adapter piece;

the battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, and the pole lugs are connected to the pole pieces and extend out of the pole pieces;

the adaptor comprises a pole connecting part and a pole lug connecting part which are connected with each other, wherein one end of the pole lug connecting part, which is far away from the pole connecting part, is bent towards the bottom and extends towards the direction of the pole connecting part so as to form an installation space with the pole connecting part;

at least one end of the pole lug, which is far away from the pole piece, is arranged in the mounting space and is fixedly connected with the pole lug connecting part.

2. The secondary battery of claim 1, wherein the tab connection portion is of a U-shaped structure, the tab connection portion includes a first section, a second section and a bending section, the first section and the second section are oppositely disposed and connected to each other through the bending section, the first section, the second section and the bending section enclose the installation space, the end of the first section is connected to the tab connection portion, and the end of the second section extends toward the tab connection portion.

3. The secondary battery according to claim 2, wherein the tab is connected to the second section on a side thereof adjacent to the first section by welding.

4. The secondary battery of claim 2, wherein the length of the second section is less than half of the thickness of the cell main body, and a part of the tabs are stacked in the middle of the cell main body and bent toward the end of the second section to extend into the mounting space.

5. A secondary battery according to any of claims 1-4, characterized in that at least part of the tab connection part has a smaller thickness than the pole connection part; and/or;

and a bending groove is formed in the pole piece connecting part along the width direction of the pole piece connecting part.

6. The secondary battery according to any one of claims 1 to 4, wherein the number of the cell bodies includes two, two of the cell bodies are stacked, the number of the tab connecting portions includes two, two of the tab connecting portions are respectively connected to the tab connecting portions, and the tabs of the two cell bodies are respectively disposed in the installation space formed by the two tab connecting portions and are respectively connected to the two tab connecting portions.

7. The secondary battery of claim 6, wherein the tabs of the two cell main bodies are disposed oppositely, the two tab connecting portions are disposed on two opposite sides of the post connecting portion, and one ends of the two tab connecting portions, which are far away from the post connecting portion, are bent toward the bottom and extend toward the post connecting portion, so as to form an installation space between the two tab connecting portions and the post connecting portion.

8. The secondary battery of claim 7, wherein the plurality of pole pieces of the two cell main bodies are stacked in the middle of the corresponding cell main body, and are respectively bent toward the outside of the cell main body and respectively extend into the mounting space along the end of the corresponding tab connecting portion.

9. The secondary battery of claim 8, wherein the number of the adapters includes two, wherein a portion of the plurality of pole pieces is a positive pole piece, another portion of the plurality of pole pieces is a negative pole piece, a portion of the plurality of tabs connected to the positive pole piece is connected to the pole piece connection portion of one of the adapters, and a portion of the plurality of tabs connected to the negative pole piece is connected to the tab connection portion of another of the adapters.

10. The manufacturing method of the secondary battery is characterized in that the secondary battery comprises a battery cell main body and an adapter, wherein the battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, the pole lugs are connected to the pole pieces and extend out of the pole pieces, and the adapter comprises a pole connecting part and a pole lug connecting part which are connected with each other and are positioned on the same plane;

the method comprises the following steps:

laminating at least part of the tabs and connecting the tabs with the tab connecting part;

bending the tab connecting part to enable the tab connecting part to be bent towards the bottom of the pole connecting part and enable the end part of the tab connecting part to extend towards the direction of the pole connecting part so as to enable part of the tab connected to the tab connecting part to be positioned in an installation space formed between the tab connecting part and the pole connecting part;

and bending the lug connected to the lug connecting part to enable the adaptor to be positioned above the battery cell main body.

11. The method of manufacturing a secondary battery according to claim 10, characterized in that:

the number of the battery cell main bodies comprises two, the middle parts of the pole pieces of the two battery cell main bodies are positive pole pieces, and the other parts of the pole pieces are negative pole pieces;

the number of the switching pieces comprises two, each switching piece is provided with two lug connecting parts, the two lug connecting parts are respectively connected to two opposite sides of the pole connecting part, and the two lug connecting parts and the pole connecting part are in the same plane;

the step of laminating at least part of the tabs and connecting the tab connection parts includes:

gathering and laminating all the tabs connected with the positive plates and all the tabs connected with the positive plates on each electric core main body in the middle of the electric core main body corresponding to the tabs respectively;

placing two cell main bodies on two sides of the two adapters respectively, stacking the tabs connected with the positive plates after the two cell main bodies are stacked on the two tab connecting parts of one adapter respectively, and stacking the tabs connected with the positive plates of the two cell main bodies on the two tab connecting parts of the other adapter respectively;

the lugs of the two battery cell main bodies are respectively connected with the lug connecting parts of the two adapters in a welding mode;

it is right utmost point ear connecting portion bend, make utmost point ear connecting portion towards the bottom of utmost point post connecting portion is buckled, and makes utmost point ear connecting portion's tip towards the direction of utmost point post connecting portion extends, so that connect in utmost point ear connecting portion's part utmost point ear is located utmost point ear connecting portion with the step in the installation space that forms between the utmost point post connecting portion includes:

bending the tab connecting parts of the two switching pieces one by one or simultaneously to bend all the tab connecting parts of the two switching pieces towards the bottom of the pole connecting part and extend the end parts of all the tab connecting parts towards the direction of the pole connecting part so as to enable the tabs connected to all the tab connecting parts to be positioned in the mounting space between the tab connecting parts and the pole connecting part;

the step of bending the tab connected to the tab connecting part to make the adaptor located above the battery cell main body comprises:

and bending all the lugs connected to the two adapters one by one or respectively to ensure that the two adapters are positioned above the battery cell main body.

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