CN220382279U

CN220382279U - Lithium battery tab connection structure and secondary battery

Info

Publication number: CN220382279U
Application number: CN202322020720.1U
Authority: CN
Inventors: 罗懿; 孙海明; 陈成
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-01-23
Anticipated expiration: 2033-07-31

Abstract

The utility model provides a lithium battery tab connection structure and a secondary battery, comprising a bare cell body, a tab and a switching piece, wherein the tab is arranged on the bare cell body; the electrode lugs are divided into a first electrode lug group and a second electrode lug group along the thickness direction of the bare cell body, and the first electrode lug group and the second electrode lug group are partially overlapped in the thickness direction of the bare cell body; the adapter piece is clamped and arranged between the first tab group and the second tab group. Above-mentioned structure, through divide into first utmost point ear group and second utmost point ear group with the utmost point ear, but connect after the grip change piece, because first utmost point ear group and second utmost point ear group only have partial coincidence, this conveniently welds and observes the welding effect, is favorable to guaranteeing welded structure intensity.

Description

Lithium battery tab connection structure and secondary battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a lithium battery tab connection structure and a secondary battery.

Background

The battery core part of the lithium battery generally adopts a winding core structure or a stacked core structure and mainly consists of pole pieces, a winding core battery core is formed by winding long pole pieces, a stacked core battery core is formed by stacking short pole pieces, and a pole lug is arranged on the battery core and is generally formed by cutting a foil material of the pole pieces or welded to the battery core through a welding process and used for connecting conductive components such as a pole post, a cover plate and the like.

The utility model patent with the prior authority bulletin number of CN213936467U discloses a tab connection structure of a bare cell and a soft package battery, wherein a plurality of pole piece tabs in a tab group are divided into a plurality of tab unit groups; the multi-group tab unit group is connected with the connecting tab through the switching support, the switching support comprises a positioning part and a welding part connected with the positioning part, the positioning part comprises a plurality of partition boards which are arranged at intervals in the thickness direction of the bare cell and are connected with the tab unit group, and the connecting tab is welded on the welding part.

In the above technical scheme, the tab group needs to be connected with the switching support first, and the rethread linking bridge is connected with the connection tab, and this kind of structure can make tab portion structure complicated, and assembly flow is complicated, and then influences the production efficiency of battery.

Disclosure of Invention

In view of this, the utility model provides a lithium battery tab connection structure and a secondary battery with simple structure and convenient assembly, so as to solve the problems that the tab part structure is complex, the assembly process is complex, and the production efficiency of the battery is affected.

The technical scheme of the utility model is realized as follows:

on one hand, the utility model provides a lithium battery tab connection structure, which comprises a bare cell body, a tab and a switching piece, wherein,

the bare cell body is provided with a tab;

the electrode lug is divided into a first electrode lug group and a second electrode lug group along the thickness direction of the bare cell body, and the first electrode lug group and the second electrode lug group are partially overlapped in the thickness direction of the bare cell body;

the switching piece centre gripping sets up between first utmost point ear group and second utmost point ear group.

On the basis of the above technical scheme, preferably, the electrode lugs are in parallelogram shapes, and the edge of the first electrode lug group, which is far away from the bare cell body, coincides with the edge of the second electrode lug group, which is far away from the bare cell body.

On the basis of the above technical solution, preferably, the overlapping surface of the first tab group and the second tab group is in an isosceles trapezoid structure.

On the basis of the technical scheme, preferably, the overlapping length of the edge of the first tab group close to the bare cell body and the edge of the second tab group close to the bare cell body is 10-20 mm.

On the basis of the technical scheme, preferably, the overlapping length of the edge of the first tab group close to the bare cell body and the edge of the second tab group close to the bare cell body is 15mm.

On the basis of the technical scheme, the device preferably further comprises a limiting block, wherein the limiting block is arranged on the switching piece and abuts against the first tab group or the second tab group.

Based on the technical proposal, the thickness of the switching piece is preferably 3-8 mm.

On the basis of the above technical solution, preferably, the thickness of the first tab set is the same as that of the second tab set.

On the basis of the technical scheme, the bare cell body is preferably in a stacked core structure or a rolled core structure.

In another aspect, the present utility model provides a secondary battery, including the above-mentioned tab connection structure of a lithium battery.

Compared with the prior art, the lithium battery tab connection structure and the secondary battery have the following beneficial effects:

(1) The tab is divided into the first tab group and the second tab group, and the tab group and the second tab group can be connected after clamping the switching piece, and as the first tab group and the second tab group are only partially overlapped, the welding is convenient to carry out, the welding effect is observed, and the welding structure strength is guaranteed;

(2) The overlapped surface of the first tab group and the second tab group is in a trapezoid shape, so that the tabs can fully clamp the switching piece to ensure the stability of the connecting structure, the connecting structure not only has good confluence capacity, but also is not easy to deform;

(3) Be provided with the stopper on the switching piece, it can support to hold on the pole piece group, so fix a position the switching piece to improve the convenience that the welding work goes on.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a tab connection structure of a lithium battery according to the present utility model;

FIG. 2 is a top view of a lithium battery tab connection structure of the present utility model;

fig. 3 is a tab connection structure diagram of the tab connection structure of the lithium battery of the present utility model;

fig. 4 is a front view of a tab connection structure of the tab connection structure of a lithium battery according to the present utility model;

in the figure: 1. a bare cell body; 2. a tab; 21. the first tab group; 22. a second ear group; 3. a transfer sheet; 4. and a limiting block.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1 to 4, the lithium battery tab connection structure of the utility model comprises a bare cell body 1, a tab 2, a switching piece 3 and a limiting block 4.

The bare cell body 1 is provided with a tab 2; the tab 2 is divided into a first tab group 21 and a second tab group 22 along the thickness direction of the bare cell body 1, and the first tab group 21 and the second tab group 22 have partial overlapping in the thickness direction of the bare cell body 1; the switching piece 3 is clamped and arranged between the first tab group 21 and the second tab group 22;

as shown in fig. 2, the illustrated X direction is the thickness direction of the bare cell body 1, the tab 2 is divided into the first tab group 21 and the second tab group 22 along the thickness direction X, and the first tab group 21 and the second tab group 22 have a partial overlap in thickness, so that the rotating tab 3 can be clamped, and the non-overlapping portion can be used as a welding position, thereby effectively improving the convenience of assembly, facilitating observation of the welding effect, and being beneficial to ensuring the welding structural strength.

Specifically, the electrode lugs 2 are in a parallelogram shape, and the edges of the first electrode lug group 21 far away from the bare cell body 1 are overlapped with the edges of the second electrode lug group 22 far away from the bare cell body 1;

by arranging the tabs 2 in the parallelogram shape and overlapping the first tab group 21 and the second tab group 22 away from the edge of the bare cell body 1, the compactness of stacking all the tabs 2 can be ensured, and the overall structural stability can be ensured after the tabs are welded with the adapter plate 3.

Further, the overlapping surface of the first tab set 21 and the second tab set 22 is in an isosceles trapezoid structure;

in the above structure, the overlapping surface of the first tab set 21 and the second tab set 22 is trapezoidal, so that the tab 2 can sufficiently clamp the switching piece 3, whether far away from the edge of the bare cell body 1 or near the edge of the bare cell body 1, so as to clamp the switching piece 3, thereby ensuring the stability of the connection structure, ensuring good converging capability and ensuring that the switching piece 3 is not easy to deform.

Specifically, the overlapping length of the edge of the first tab set 21 close to the bare cell body 1 and the edge of the second tab set 22 close to the bare cell body 1 is 10-20 mm, so that the stability of clamping the adapter piece 3 is ensured, and the preferable overlapping length is 15mm.

Further, the thicknesses of the first tab set 21 and the second tab set 22 are the same;

as the structure is adopted, the two tab groups can be guaranteed to have the same structural strength, the phenomenon that the single-side tab group is folded when the structural strength is low after welding is avoided, and the reliability and the safety of application are improved.

Further, in order to ensure the convenience of the installation of the switching piece 3, a limiting block 4 is provided, the limiting block 4 is arranged on the switching piece 3, and the limiting block 4 abuts against the first tab group 21 or the second tab group 22;

according to the structure, when the switching piece 3 is installed, the switching piece 3 is inserted between the first tab group 21 and the second tab group 22 from one side, then the switching piece 3 is slid until the limiting block 4 on the switching piece 3 abuts against the first tab group 21 or the second tab group 22, so that the switching piece 3 is guaranteed to be in place and then is welded continuously, and the rapid positioning of the switching piece 3 relative to the tab 2 can be realized, so that the welding convenience is improved.

Preferably, the thickness of the tab 3 is 3-8 mm, which avoids excessively increasing the thickness of the tab 2 region of the tab 3 in the mating structure, to facilitate subsequent assembly into a battery housing to form a battery.

The tab connection structure can be applied to secondary batteries with a stacked core structure or secondary batteries with a rolled core structure, and more particularly can be applied to hard shell lithium ion secondary batteries.

The specific implementation steps are as follows:

firstly, cutting a parallelogram-shaped tab 2 on a pole piece, then winding the pole piece or stacking the pole pieces to form a bare cell body 1, a first tab group 21 and a second tab group 22, then inserting a switching piece 3 into the first tab group 21 and the second tab group 22, transversely sliding the switching piece 3 until a limiting block 4 abuts against the first tab group 21 or the second tab group 22, completing positioning of the switching piece 3, and then welding and fixing the tab 2 and the switching piece 3.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A lithium battery tab connection structure is characterized in that: comprises a bare cell body (1), a pole lug (2) and a switching piece (3), wherein,

the bare cell body (1) is provided with the electrode lug (2);

the electrode lug (2) is divided into a first electrode lug group (21) and a second electrode lug group (22) along the thickness direction of the bare cell body (1), and the first electrode lug group (21) and the second electrode lug group (22) are partially overlapped in the thickness direction of the bare cell body (1);

the adapter piece (3) is clamped and arranged between the first tab group (21) and the second tab group (22).

2. The lithium battery tab connection structure of claim 1, wherein: the electrode lugs (2) are in a parallelogram shape, and the edges of the first electrode lug groups (21) far away from the bare cell body (1) are overlapped with the edges of the second electrode lug groups (22) far away from the bare cell body (1).

3. The lithium battery tab connection structure of claim 2, wherein: the overlapping surface of the first tab group (21) and the second tab group (22) is of an isosceles trapezoid structure.

4. The lithium battery tab connection structure of claim 3, wherein: the overlapping length of the edge of the first tab group (21) close to the bare cell body (1) and the edge of the second tab group (22) close to the bare cell body (1) is 10-20 mm.

5. The lithium battery tab connection structure of claim 4, wherein: the overlapping length of the edge of the first tab group (21) close to the bare cell body (1) and the edge of the second tab group (22) close to the bare cell body (1) is 15mm.

6. The lithium battery tab connection structure of claim 5, wherein: the solar cell further comprises a limiting block (4), wherein the limiting block (4) is arranged on the switching piece (3), and the limiting block (4) abuts against the first tab group (21) or the second tab group (22).

7. The lithium battery tab connection structure of claim 1, wherein: the thickness of the adapter sheet (3) is 3-8 mm.

8. The lithium battery tab connection structure of claim 1, wherein: the thickness of the first tab group (21) is the same as that of the second tab group (22).

9. The lithium battery tab connection structure according to any one of claims 1 to 8, wherein: the bare cell body (1) is of a stacked core structure or a rolled core structure.

10. A secondary battery characterized in that: a lithium battery tab connection structure comprising any one of claims 1-9.