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Method for preventing tab reverse insertion to reduce battery cell failure

A technology of tabs and bare cells, which is applied in the field of preventing tabs from being inserted backwards and reducing cell failure, can solve problems such as reducing the space occupied by inactive substances, reducing the risk of taking up space and failure, preventing tabs from being misplaced, and ensuring safety. high sex effect

Pending Publication Date: 2020-06-26
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method integrates multi-layer tabs by pre-welding at the root of multi-layer tabs, does not increase the shaped parts for integrating tabs, reduces the space occupied by inactive materials, and effectively prevents misalignment of tabs at the same time, solving the problem of multi-layer tabs. Inversion problem

Method used

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  • Method for preventing tab reverse insertion to reduce battery cell failure
  • Method for preventing tab reverse insertion to reduce battery cell failure
  • Method for preventing tab reverse insertion to reduce battery cell failure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a method for preventing tabs from being inserted upside down, and the method includes the following steps:

[0065] (1) The positive electrode sheet, the separator and the negative electrode sheet are stacked successively for winding, the width of the positive electrode sheet is smaller than that of the negative electrode sheet, the width of the negative electrode sheet is smaller than the separator, and two positive electrode sheets and the negative electrode sheet are respectively welded A trapezoidal tab, the trapezoidal tab has an upper bottom width of 10 mm, a lower bottom width of 30 mm, and a height of 25 mm;

[0066] (2) Perform laser welding at the root of the trapezoidal tab at a position at a vertical distance of 3 mm from the upper edge of the separator to integrate the tab to obtain a bare cell.

Embodiment 2

[0068] This embodiment provides a method for preventing tabs from being inserted upside down, and the method includes the following steps:

[0069] (1) The positive electrode sheet, the separator and the negative electrode sheet are stacked sequentially for winding, the width of the positive electrode sheet is smaller than that of the negative electrode sheet, the width of the negative electrode sheet is smaller than the separator, and 4 are respectively welded on the positive electrode sheet and the negative electrode sheet Trapezoidal lugs, the width of the upper bottom of the trapezoidal lug is 15mm, the width of the lower bottom is 35mm, and the height is 35mm;

[0070] (2) Perform laser welding at the root of the trapezoidal tab at a position vertically 9 mm from the upper edge of the isolation film to integrate the tab to obtain a bare cell.

Embodiment 3

[0072] This embodiment provides a method for preventing tabs from being inserted upside down, and the method includes the following steps:

[0073] (1) The positive electrode sheet, the separator and the negative electrode sheet are stacked successively for winding, the width of the positive electrode sheet is smaller than the negative electrode sheet, the width of the negative electrode sheet is smaller than the separator, and 6 are respectively welded on the positive electrode sheet and the negative electrode sheet A trapezoidal tab, the trapezoidal tab has an upper bottom width of 20 mm, a lower bottom width of 40 mm, and a height of 45 mm;

[0074] (2) Perform laser welding at the root of the trapezoidal tab at a position 15 mm perpendicular to the upper edge of the isolation film, integrate the tab, and obtain a bare cell.

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Abstract

The invention relates to a method for preventing tab reverse insertion to reduce battery cell failure. The method comprises the following steps of pre-welding the roots of multiple layers of tabs, andintegrating the multiple layers of tabs to obtain a bare battery cell. According to the method provided herein, by pre-welding the roots of the multiple layers of tabs, the melting permeation betweenatoms is realized at the the roots of the tabs, the roots of the tabs are melted together firmly, and the integration of multiple layers of tabs is realized, so that the problem of reverse insertionof the multiple layers of tabs is solved, the situation that during the assembly and forming process of the bare battery cell, the positive plate and the negative plate are contacted due to the bending caused by the length redundancy of the tabs to thereby generate the short-circuit, fire and explosion, is avoided, and the purpose of reducing the battery cell failure is achieved. The method is simple to operate and has higher application value.

Description

technical field [0001] The invention relates to the technical field of batteries, and in particular to a method for preventing reverse insertion of tabs and reducing failure of batteries. Background technique [0002] With the rapid development of commercial batteries, the market's requirements for battery energy density are getting higher and higher. In order to further increase the energy density of the battery, the main technical routes are: (1) adopting high compaction density and increasing the thickness of the pole piece; (2) reducing the occupied space of inactive materials in the battery, etc. [0003] At present, in order to improve the space utilization rate of the cell shell, the tabs in the cell have received extensive attention. There are mainly two aspects of research: on the one hand, more space in the thickness direction of the tab is used, so for the continuous extrusion of the tab, during the extrusion process, it may be squeezed to the root of the tab, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M2/34
CPCH01M50/54H01M50/572Y02E60/10
Inventor 樊松曾源兴邹圣超
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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