CN212033171U

CN212033171U - Improve core structure that rolls up of square lithium ion battery deformation

Info

Publication number: CN212033171U
Application number: CN202020654637.3U
Authority: CN
Inventors: 林俊颇; 林俊仰; 黎显龙; 黄贇; 杨联贵
Original assignee: Zhongshan Tianmao Battery Co Ltd
Current assignee: Zhongshan Tianmao Battery Co Ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-11-27
Anticipated expiration: 2030-04-27

Abstract

The utility model relates to an improve core structure that rolls up of square lithium ion battery deformation, include: roll up the core, roll up the core and constitute by positive plate, negative pole piece and barrier film, be equipped with positive tab on the positive plate, be equipped with the negative tab on the negative pole piece, separate with the barrier film between the positive and negative pole piece, constitute after positive plate, negative pole piece and the barrier film are convoluteed and roll up the core, the negative tab set up the marginal position at the first negative pole piece head of rolling up the core, positive tab establish the position department of rolling up the empty paper tinsel of first positive plate front end of core, positive tab and negative tab all are in the middle part position of rolling up core thickness direction. The utility model discloses a just, negative pole utmost point ear all is in the intermediate thickness position of rolling up the core, consequently, after the battery charging pole piece inflation, has obviously improved because of the uneven book core deformation condition that causes of the oppression atress that receives utmost point ear to square lithium ion battery's bulging deformation defective rate has been reduced effectively.

Description

Improve core structure that rolls up of square lithium ion battery deformation

Technical Field

The utility model relates to a lithium ion battery especially relates to a roll core structure that improves square lithium ion battery and warp.

Background

The square lithium ion battery is an important branch of the lithium ion battery, and is not only widely applied to the field of communication electronics, but also gradually applied to the field of power and energy storage. Because lithium ion battery electrode material lattice parameter changes in the charging process, the electrode can produce the inflation, and the electrode is at the in-process of inflation, because of reserving the inflation space not enough or roll up the core and receive the restriction of unbalanced force, causes the deformation of rolling up the core very easily to cause the deformation of battery. At present, the problem of bulging deformation of a square lithium ion battery is a common problem, particularly the problem that a large-capacity square lithium ion battery is more serious, and deformation caused by electrode expansion is a main reason. The existing roll core structure design is that the anode lug is designed on the outmost layer of the roll core, and the upper end of the anode lug is welded at the middle position of the battery cover plate, so that after the roll core enters the shell, a certain inclination exists between the head end lug welded at the cover plate and the tail end lug positioned on the outmost layer of the roll core, and after the electrode is charged and expanded, the roll core is easy to deform due to the compression limitation of the position of the anode lug.

Disclosure of Invention

The utility model aims at providing an improve the roll core structure that square lithium ion battery warp to above-mentioned problem exactly.

The utility model adopts the technical proposal that: a improve winding core structure that square lithium ion battery warp includes: roll up the core, roll up the core and constitute by positive plate, negative pole piece and barrier film, be equipped with positive tab on the positive plate, be equipped with the negative tab on the negative pole piece, separate with the barrier film between the positive and negative pole piece, constitute after positive plate, negative pole piece and the barrier film are convoluteed and roll up the core, the negative tab set up the marginal position at the first negative pole piece head of rolling up the core, positive tab establish the position department of rolling up the empty paper tinsel of first positive plate front end of core, positive tab and negative tab all are in the middle part position of rolling up core thickness direction.

The utility model has the advantages that: the utility model discloses a just, negative pole utmost point ear all is in the intermediate thickness position of rolling up the core, consequently, after the battery charging pole piece inflation, has obviously improved because of the uneven book core deformation condition that causes of the oppression atress that receives utmost point ear to square lithium ion battery's bulging deformation defective rate has been reduced effectively.

Drawings

Fig. 1 is a schematic perspective view of one embodiment of the present invention.

Fig. 2 is a schematic view of a horizontal cross section of the cell of fig. 1.

Fig. 3 is a schematic perspective view of a conventional battery cell.

Fig. 4 is a schematic view of a horizontal cross section of the cell of fig. 3.

Detailed Description

As shown in fig. 1 to 4, the present invention includes: roll up core 1, roll up the core and constitute by positive plate 11, negative pole piece 12 and barrier film 13, be equipped with positive tab 3 on the positive plate, be equipped with negative tab 2 on the negative plate, separate with the barrier film between the positive and negative pole piece, constitute after positive plate, negative plate and barrier film coiling and roll up the core, the negative tab set up the marginal position at the first negative plate head of rolling up the core, positive tab establish the position department of the empty paper tinsel of first positive plate front end at roll core, positive tab and negative tab all are in the middle part position of rolling up core thickness direction. Therefore, after the battery charging pole piece expands, the deformation of the winding core caused by the compression of the pole lugs and uneven stress is obviously improved. The problem of deformation of the winding core caused by uneven stress of the electrode expansion can be effectively solved, and therefore the bulging deformation reject ratio of the square lithium ion battery is effectively reduced. The positive tab and the negative tab of the winding core are respectively welded at the main body of the cover plate and the rivet, and the whole winding core is sealed in the shell and the cover plate.

Claims

1. A improve winding core structure that square lithium ion battery warp includes: roll up core (1), roll up the core and constitute by positive plate (11), negative pole piece (12) and barrier film (13), be equipped with anodal ear (3) on the positive plate, be equipped with negative pole ear (2) on the negative pole piece, separate with the barrier film between the positive and negative pole piece, constitute roll core, its characterized in that after positive plate, negative pole piece and the barrier film convolute: negative pole ear (2) set up the marginal position at the first negative pole piece head of rolling up the core, positive pole ear (3) establish the position department at the empty paper tinsel of the first positive pole piece front end of rolling up the core, positive pole ear and negative pole ear all are in the middle part position of rolling up core thickness direction.