Multi-tab coiled lithium ion battery pole piece and preparation method thereof

A lithium-ion battery, wound-type technology, applied in the field of lithium-ion batteries, can solve the problems of punctured diaphragm battery short circuit, battery cost increase, etc., to achieve the effect of reducing cumulative tolerance, reducing battery cost, and improving safety and reliability

Inactive Publication Date: 2019-08-02
SHANGHAI RUIPU ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this multi-tab die-cutting method requires two die-cuts between two adjacent tabs, and a raised step must be formed at the intersection of the two knives. The step is relatively sharp and may puncture the diaphragm and cause an internal short circuit of the battery. great hidden danger
Some companies in the industry have increased the process of coating the protective layer on the upper edge of the positive electrode to prevent the separator from being pierced by the raised steps to form a short circuit, which will greatly increase the cost of the battery

Method used

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  • Multi-tab coiled lithium ion battery pole piece and preparation method thereof
  • Multi-tab coiled lithium ion battery pole piece and preparation method thereof
  • Multi-tab coiled lithium ion battery pole piece and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 2 As shown, this embodiment adopts a knife die, and die-cuts five tabs 11 on the pole piece body 1, the width of adjacent tabs 11 increases by 1.7mm in turn, and the distance between two adjacent tabs 11 Both are 67.73mm.

Embodiment 2

[0028] Such as image 3 As shown, this embodiment adopts 2 cutting dies, and die-cuts 10 pole lugs 11 on the pole piece body 1, wherein the first to fifth pole lugs 11 from left to right are the first group, and the first Die-cutting, the width of adjacent tabs 11 increases by 1.7mm in turn, and the distance between adjacent tabs 11 is 67.73mm; the 6th to 10th tabs 11 are the second group, and the adjacent tabs 11 The width increases by 1.7mm in turn, and the distance between adjacent tabs is 76.26mm. The distance between the fifth and sixth tabs can be the length of the first die or the length of the second die.

Embodiment 3

[0030] Such as Figure 4 As shown, in this embodiment, 3 cutting dies are used to die-cut 15 tabs, among which, the first to fifth tabs 11 from left to right are the first group, which are die-cut with the first die-cutting die, adjacent to each other. The width of tabs 11 increases by 1.7mm in turn, and the distance between adjacent tabs 11 is 67.73mm; the 6th to 10th tabs 11 are the second group, which are die-cut with the second knife, and the adjacent tabs The width of 11 increases by 1.7mm in turn, and the distance between adjacent tabs is 76.26mm. The distance between the fifth and sixth tabs can be the length of the first die or the length of the second die; The 11th to 15th tabs 11 are the third group, die-cut with the third knife, the width of adjacent tabs 11 increases by 1.7mm, the distance between adjacent tabs is 84.80mm, the 10th The distance from the 11th tab can be the length of the second die or the length of the third die.

[0031] Since the present inventi...

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Abstract

The invention provides a multi-tab coiled lithium ion battery pole piece. The multi-tab coiled lithium ion battery pole piece includes a pole piece body and multiple tabs and is characterized in thatthe multiple tabs are divided into n groups, each group of the tabs includes x tabs, width from the first tab to the xth tab sequentially increases from L1 to Lmax in the form of an arithmetic progression, a distance between two adjacent tabs is W, difference of the width of the second tab and the first tab is 2pideltat, the deltat is the sum of thicknesses of positive electrode pieces, negative electrode pieces and two layers of separators in the winding process. The multi-tab coiled lithium ion battery pole piece is advantaged in that 1, the part between any two adjacent tabs is designed tobe one-time die cutting, raised steps formed at the crossing portion of two die cutting are eliminated, the battery self-discharge rate is reduced, and safety and reliability of the battery are improved; and 2, the total number of die cutting of the pole piece is reduced by half compared with a conventional method, the life of a die can be significantly extended, the cumulative tolerance of the pole piece length dimension is reduced, and die cutting and winding accuracy are improved.

Description

technical field [0001] The invention relates to a multi-tab wound lithium-ion battery pole piece and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Under the existing technical conditions, lithium-ion batteries are divided according to the internal process and structural characteristics, and there are two methods: winding and lamination. The laminated battery cell is composed of multi-layer cathode pieces and anode pieces connected in parallel. Each electrode piece can lead to a tab, so the internal resistance of the battery is small and the rate performance is excellent, but the production efficiency is low, and the four sides of the pole pieces are affected. Blade punching is easy to generate dust and burrs and cause micro-short circuit. The production efficiency of winding cells is high and it is easy to realize automation, but it cannot lead out a tab for each layer like laminated cells, which great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/058
CPCH01M10/058H01M10/0587Y02E60/10Y02P70/50
Inventor 刘微张志明刘婵
Owner SHANGHAI RUIPU ENERGY CO LTD
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