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Fabrication method of soft pack battery

A soft-pack battery and cell technology, applied in the field of lithium-ion batteries, can solve the problem of easy removal of the second cover, and achieve the effects of reducing the force on the tape, reducing damage, and improving the yield of the battery

Active Publication Date: 2019-03-08
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a pouch battery, so as to solve the problem that the adhesive tape of the laminated battery cell is easily moved to the second cover during the pumping process

Method used

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  • Fabrication method of soft pack battery
  • Fabrication method of soft pack battery
  • Fabrication method of soft pack battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] A method for preparing a pouch battery, comprising the steps of:

[0026] 1) Perform homogenization, coating, rolling, die-cutting, and lamination according to the cell preparation process to ensure that the process is qualified and obtain the cell.

[0027] 2) Use adhesive tape to bond the thickness of both sides of the cell to fix the layers in the cell, such as figure 1 As shown; when fixed, the starting end of the adhesive tape is bonded to the end surface of one side of the battery (the end surface is not a thickness surface, corresponding to the main surface formed by the length and width of the battery), and the free end is wound along the direction perpendicular to the extension of the tab. After passing through the thickness surface of the cell, it terminates on the end face on the other side of the cell. Use adhesive tape to fix the upper end of the cell close to the tab and the lower end of the cell away from the tab respectively. Use tapes to fix the thick...

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Abstract

The invention relates to a fabrication method of a soft pack battery. The fabrication method comprises the following steps of 1) pasting two side thickness surfaces of a lamination battery cell with adhesive tapes; 2) performing top sealing on the top of the battery cell with a tab by an aluminum plastic film, performing side sealing on one of the side thickness surfaces of the battery cell, allowing the other side thickness surface of the battery cell to face an air bag mouth packaged by the aluminum plastic film, and locally packaging the aluminum plastic film at a downstream of an adhesivetape pasting position on the other side thickness surface along an air exhaust direction; and 3) performing liquid injection, primary sealing, formation, air pumping and secondary sealing after localpackage, thereby obtaining the soft pack battery. According to the fabrication method of the soft pack battery, provided by the invention, local package is performed on the aluminum plastic film aftertop sealing and side sealing of the battery cell, so that the adhesive tape is prevented from being directly sucked during the subsequent air pumping process, the stress to the adhesive tape during the air pumping process is reduced, and the pasting failure of the adhesive tape is prevented.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a soft pack battery. Background technique [0002] Compared with metal shell batteries, soft-pack lithium-ion batteries with aluminum-plastic film as shell materials are more and more widely used in power batteries, portable devices and other fields due to their unique safety and shape design flexibility. [0003] The aluminum-plastic film is a multi-layer composite material, which consists of polypropylene, aluminum foil and nylon from the inside to the outside. Among them, the aluminum foil layer in the middle is the one that really plays a sealing role. Under normal circumstances, the aluminum foil layer does not contact the electrolyte in the battery. Therefore it will not be corroded. However, when the inner PP layer is damaged, the aluminum foil layer will be in contact with the negative electrode and the electrolyte to form lithium ...

Claims

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Application Information

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IPC IPC(8): H01M10/04
CPCH01M10/04H01M10/045Y02E60/10Y02P70/50
Inventor 许飞尼亚琼李云峰赵永锋李杰马红涛李二阳王攀张二斌翟东
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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