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Tab bending method for multi-tab battery cell

A multi-pole and tab technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as the large influence of the position of the tabs, the difficulty of inserting the bare cell into the shell, and the loose structure.

Active Publication Date: 2021-10-29
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the industry, the double-folding scheme is commonly used for the head-folding tab structure of the multi-tab structure battery. The bending consistency is poor, and the structure is loose after bending, and it is easy to open before the top seal, resulting in bare cells. It is difficult to enter the case, which has a great influence on the position of the tab during packaging, and the packaging efficiency is low

Method used

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  • Tab bending method for multi-tab battery cell
  • Tab bending method for multi-tab battery cell
  • Tab bending method for multi-tab battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The method for folding the tabs of the multi-tab battery includes step 1, cutting the tabs on the two pole pieces respectively, and then winding the two pole pieces and the diaphragm in order to prepare a bare battery cell 1 with a multi-tab structure; Step 2: Overlap several tabs with the same polarity, then cut and heat-press to form a foil tab group 4 with a preset shape, and at the same time, bend the metal strip tab 5 with a through hole 51 Preset angle, wherein, the surface of the metal strip tab 5 is pasted with tab glue 52; step 3, the foil tab group 4 is passed through the through hole 51, and the root 54 of the metal strip tab 5 is wrapped, and then The foil tab group 4 and the metal strip tab 5 are fixedly connected; step 4, stick the protective tape on the foil tab group 4 and the metal strip tab 5 .

[0044]In the current industry, the double-folding scheme is commonly used for the head-folding tab structure of the multi-tab structure battery. It is diffic...

Embodiment 2

[0051] The difference from the first embodiment is that the shape of the foil tab group 4 in this embodiment is convex, the shape of the head 53 of the metal strip tab 5 is square, and the shape of the root 54 of the metal strip tab 5 is trapezoidal. , the temperature of the hot pressing is 10°C, the pressure of the hot pressing is 0.1Mpa, and the bending angle of the tab 5 of the metal strip is 70°. In this embodiment, after cutting, the shape of the foil tab group 4 can be designed as a convex shape or other shapes, so that the foil tab group 4 can pass through the through hole 51, and the metal strip tab 5 is divided into two ends. The root 53 and the root 54, the root 54 is the end close to the bare cell 1, the shape of the root 54 of the metal strip tab 5 is trapezoidal, the lower bottom of the trapezoid is connected to the head 53, and the foil tab with a convex shape Group 4, to avoid scratching between the root 54 of the metal strip tab 5 and the foil tab group 4, resu...

Embodiment 3

[0054] The difference from Example 1 is that in step 1 of this example, the active material is also coated on the foil, and then rolled and slit to form pole pieces. The pole pieces include cathode pieces and anode pieces. Cut out several cathode lugs 2 on the sheet, cut out several anode lugs 3 on the anode sheet, the temperature of hot pressing is 100°C, the pressure of hot pressing is 0.6Mpa, and the bending angle of the metal strip tab 5 is 110° . Specifically, the pole piece is divided into a cathode piece and an anode piece, and several cathode lugs 2 are cut out on the cathode piece, and several anode lugs 3 are cut out on the anode piece, and several cathode lugs 2 are stacked into a The foil tab group 4 of the cathode, and several anode tabs 3 are stacked to form the foil tab group 4 of the anode before being hot-pressed and bent. Both foil tab groups 4 can adopt the above-mentioned tab folding process, or One of the foil tabs 4 can adopt the above-mentioned process;...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a tab bending method of a multi-tab battery cell. The method comprises the following steps of 1, respectively cutting tabs on two pole pieces, and sequentially winding the two pole pieces and a diaphragm to prepare a naked battery cell with a multi-tab structure; 2, overlapping a plurality of tabs with the same polarity and then cutting, hot-pressing and bending into a foil tab group with a preset shape, meanwhile, bending a metal strap tab with a through hole by a preset angle, wherein tab glue is pasted to the surface of the metal strap tab; 3, enabling the foil tab group to pass through the through hole, wrapping the root of the metal strap tab, and then fixedly connecting the foil tab group with the metal strap tab; and 4, pasting protective adhesive paper on the foil tab group and the metal strap tab. By optimizing the multi-tab process, the stability of the multi-tab structure is improved, and the position consistency of the bent tabs can be improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for folding tabs of a multi-tab battery cell. Background technique [0002] Nowadays, all countries are vigorously developing green and high-efficiency secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. They are widely used in portable appliances, electric tools, large Energy storage, electric transportation power supply and other aspects have broad application prospects. [0003] At present, in the industry, the double-folding scheme is commonly used for the head-folding tab structure of the multi-tab structure battery. The bending consistency is poor, and the structure is loose after bending, and it is easy to open before the top seal, resulting in bare cells....

Claims

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Application Information

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IPC IPC(8): H01M50/538H01M10/0587H01M10/0525
CPCH01M50/538H01M10/0587H01M10/0525Y02P70/50Y02E60/10
Inventor 郑开元韩冰纪荣进郑明清陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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