Lithium-ion pouch cell and preparation method thereof

A lithium-ion battery and ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of internal corrosion of the battery at the stretching degree, packaging temperature, easy peeling of the CPP layer, high price of aluminum-plastic film, etc., achieve high air tightness, and reduce fire and combustion The risk of explosion and the effect of high productivity

Inactive Publication Date: 2018-02-23
梁百胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing soft-packed lithium-ion batteries are packaged in aluminum-plastic film, and this packaging method is easily damaged by the internal pressure of the battery in some harsh environments such as high-temperature and high-humidity conditions. Increase, the CPP layer is easy to peel off, causing external moisture to enter, causing battery water absorption failure or causing safety hazards, and in the battery production package due to the different stretching degrees of the aluminum-plastic film and the fluctuation of the package temperature, etc., which inevitably cause some damage to the battery. Corrosion inside, eventually causing the battery to bulge
At the same time, the battery packaged with aluminum-plastic film must have cutouts, and the middle layer of aluminum-plastic film is an aluminum layer. These cutouts will be conductive due to the aluminum layer, which is also a great safety hazard. The battery may catch fire and explode if it is short-circuited with the protection board or electrical appliances
And the price of aluminum-plastic film is higher, which increases the manufacturing cost of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of soft-pack lithium-ion battery, comprises the electric core that has tab, and the shell of soft-pack lithium-ion battery is made of silica gel, and electric core is placed in composite film (by PPC (polypropylene copolymer) layer and PA ( A double-layer composite film obtained by compounding two layers of polyamide), the composite film is wrapped inside and outside the silicone shell, and the tabs protrude from the silicone shell.

[0030] To prepare the soft pack lithium-ion battery, the preparation steps are as follows:

[0031] 1), first prepare the rolled or laminated bare cells and the double-layer composite film of the corresponding size, use the double-layer composite film to seal the top and side of the bare cells, the sealing temperature is 180°C, and the time is 1S;

[0032] 2) Baking the battery sealed on the top side to remove water, injecting electrolyte, and charging and discharging the battery after the electrolyte and the cell are fully infiltra...

Embodiment 2

[0035] A soft pack lithium ion battery, the structure is the same as that of embodiment 1. Preparation:

[0036] To prepare the soft pack lithium-ion battery, the preparation steps are as follows:

[0037] 1), first prepare the rolled or laminated bare cells and the double-layer composite film of the corresponding size, use the double-layer composite film to seal the top and side of the bare cells, the sealing temperature is 160 ° C, and the time is 2S;

[0038] 2) Baking the battery sealed on the top side to remove water, injecting electrolyte, and charging and discharging the battery after the electrolyte and the cell are fully infiltrated;

[0039] 3) Then vacuum seal it twice, the sealing temperature is 160°C, and the time is 2 seconds. After the second seal, use a silicone bag of the corresponding size to wrap the battery with the composite film in it, and cover the silicone cap, and then put the silicone bag and the silicone cap. Stick with glue. The silica gel cap is...

Embodiment 3

[0041] A soft pack lithium ion battery, the structure is the same as that of embodiment 1. Preparation:

[0042] To prepare the soft pack lithium-ion battery, the preparation steps are as follows:

[0043] 1), first prepare the rolled or laminated bare cells and the double-layer composite film of the corresponding size, use the double-layer composite film to seal the top and side of the bare cells, the sealing temperature is 170°C, and the time is 1-2S;

[0044] 2) Baking the battery sealed on the top side to remove water, injecting electrolyte, and charging and discharging the battery after the electrolyte and the cell are fully infiltrated;

[0045] 3) Then vacuum seal it twice, the sealing temperature is 170°C, and the time is 1-2S. After the second seal, put the battery wrapped with the composite film in a silicone bag of the corresponding size, and cover the silicone cap, and then put the silicone bag with the The silicone cap is attached with glue. The silica gel cap ...

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PUM

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Abstract

The invention belongs to the technical field of lithium-ion cells and particularly relates to a lithium-ion pouch cell and a preparation method thereof. The preparation method comprises packaging a core with a silicone shell in a specific mode; the prepared lithium-ion pouch is water resistant, uncontrollable reaction in the cell can be successfully prevented, and accordingly fire, burn and explosion chances are slimmed; the finally prepared cell has better safety since the inside of the core is fully insulated from the outside. In addition, a packaging method herein is simple, the material cost is low, the process is easy to control, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a soft-pack lithium-ion battery and a preparation method thereof. Background technique [0002] Due to the development of portable electronic products, rechargeable lithium-ion batteries have been widely used due to their characteristics of high voltage, high capacity, reusability, good safety, small self-discharge, and fast charging. However, most of the existing soft-pack lithium-ion batteries are packaged in aluminum-plastic film, and this packaging method is easy to be damaged by the internal pressure of the battery in some harsh environments such as high-temperature and high-humidity conditions. Increase, the CPP layer is easy to peel off, causing external moisture to enter, causing battery water absorption failure or causing safety hazards, and in the battery production package due to the different stretching degrees of the aluminum-plastic film an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 梁百胜
Owner 梁百胜
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