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Method and apparatus for accelerating rebound of lithium ion battery pole piece

A technology of lithium-ion batteries and pole pieces, which is applied to battery electrodes, electrode manufacturing, electrode heat treatment, etc., to achieve the effect of reducing production costs and shortening the circulation cycle

Inactive Publication Date: 2018-09-18
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The only problem involved is that after packaging, the test value of the battery’s crater depth is about 4.0mm, and whether the rebound will affect the depth of the crater

Method used

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  • Method and apparatus for accelerating rebound of lithium ion battery pole piece
  • Method and apparatus for accelerating rebound of lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] As an embodiment of the present invention such as figure 2 As shown, the negative pole piece enters the roll 6 through the online thickness gauge 5, and a deviation correction system 1 is arranged between the roll 6 and the heat treatment oven 3. The deviation correction system 1 adopts a serpentine deviation correction device, that is, the swing direction of the deviation correction swing roller is along the belt running direction, The inside of the heat treatment oven 3-1 is heated by infrared, and the heating temperature is 80 °C. The inside of the heat treatment oven 3-2 is heated by conveying air, and the heating temperature is 60 °C. The belt speed is 50 m / min.

[0022] After the heat treatment, the negative pole piece is then subjected to processes such as die-cutting and slitting to obtain the negative pole piece to be wound.

[0023] Take the same roll of negative pole pieces after rolling, one part of the pole piece has been heat-treated, and the other part ...

Embodiment 2

[0025] As another embodiment of the present invention, the heat treatment device is placed at the front end of the die-cutting machine, and the negative pole piece to be die-cut into shape enters the interior of the heat treatment oven through the serpentine deviation correction system 1, and the interior of the heat treatment oven 3-1 adopts infrared heating. , the heating temperature is 90°C, the interior of the heat treatment oven 3-2 is heated by infrared, the heating temperature is 70°C, the cooling water temperature of the cooling roller 4 at the exit of the heat treatment is 8°C, and the heat treatment belt speed is 30 m / min.

[0026] The heat-treated negative pole piece is directly die-cut, and then undergoes a slitting process to obtain a negative pole piece to be wound.

Embodiment 3

[0028] As another embodiment of the present invention, the heat treatment device is placed at the rear end of the die-cutting machine, and the negative pole piece with tabs enters the interior of the heat treatment oven through the serpentine deviation correction system 1, and the interior of the heat treatment oven 3-1 is heated by microwaves. , the heating temperature is 80 °C, the interior of the heat treatment oven 3-2 is heated by infrared, the heating temperature is 60 °C, the cooling water temperature of the cooling roller 4 at the exit of the heat treatment is 9 °C, and the heat treatment belt speed is 30 m / min.

[0029] The heat-treated negative pole piece is then subjected to a cutting process to obtain a wound or laminated negative pole piece.

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PUM

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Abstract

The invention relates to the technical field of lithium battery production, particularly a method for accelerating rebound of a lithium ion battery pole piece. The pole piece comprises a current collector and an active diaphragm coated on the current collector; and the pole piece is subjected to heat treatment after the pole piece is rolled and pressed and before the pole piece is laminated or wound. The invention also comprises an apparatus for accelerating rebound of the lithium ion battery pole piece. The apparatus comprises a roller, a heat treatment box and a cooling roller arranged on aproduction line in sequence; and an on-line thickness measurer is arranged on the front end of the roller and / or the back end of the cooling roller. By adoption of the method and apparatus, the problems of difficulty in putting a cell into the shell, abnormal battery thickness and the like caused by inconsistent pole piece thickness rebound after rolling can be avoided, the pole piece turnover period can be shortened, and the production cost of the battery is lowered.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a method and a device for accelerating the rebound of lithium-ion battery pole pieces. Background technique [0002] The preparation process of lithium-ion battery pole pieces (including positive pole pieces and negative pole pieces) usually includes pulping, film coating, drying, rolling and cutting, although the manufacturing processes of different manufacturers or different batteries may vary. But pole piece rolling is an essential process. The pole piece reaches a certain compaction density after rolling, which is very important for improving the energy density of lithium-ion batteries. Our current technology is the cold pressing technology of the rollers. The pole pieces are rolled by the two rollers of the cold press at room temperature to reach the designed thickness. Although this cold pressing technology can improve the compaction density of the pole...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04
CPCH01M4/0435H01M4/0471H01M4/139Y02E60/10
Inventor 王云辉王红领王纯刚孙青山
Owner CALB CO LTD