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Surface corrosion-resistant lithium battery flexible package film

A technology for flexible packaging films and lithium batteries, which is applied to battery pack components, battery boxes/covers, battery box/cover materials, etc., which can solve the problems of content leakage, easy corrosion, explosion, etc., and achieve good heat resistance And chemical corrosion resistance, high barrier performance, the effect of guaranteed barrier property

Inactive Publication Date: 2016-12-07
SHANGHAI ZIJIANG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common aluminum-plastic film generally uses nylon (PA) as the surface layer, but nylon (PA) is easily corroded and has no blocking effect when encountering the electrolyte used in lithium batteries. Therefore, once the surface of the aluminum-plastic film comes into contact with the electrolyte, it will The formation of white spots will not only affect the appearance of the lithium battery, but also may penetrate and corrode the aluminum foil of the barrier layer in severe cases, affecting the barrier performance of the aluminum-plastic film, causing the contents to leak or even explode

Method used

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  • Surface corrosion-resistant lithium battery flexible package film
  • Surface corrosion-resistant lithium battery flexible package film

Examples

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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, it is a schematic diagram of a lithium battery flexible packaging film with a corrosion-resistant surface. The flexible packaging film for a lithium battery with a corrosion-resistant surface includes a fluoroplastic layer 1, an aluminum foil barrier layer 2 and a polypropylene heat-sealing layer 3. The fluoroplastic layer 1 It is arranged on the outer side of the aluminum foil barrier layer 2 , and the polypropylene heat-sealing layer 3 is arranged on the inner side of the aluminum foil barrier layer 2 , and the fluoroplastic layer 1 and the aluminum foil barrier layer 2 are bonded by an adhesive 4 . The aluminum foil barrier layer 2 and the polypropylene heat-sealing layer 3 are bonded by an adhesive 4 .

[0022] Described fluoroplastic layer 1 selects the polychlorotrifluoroethylene (PCTFE) film that the thickness of Honeywell is 19 microns for use, and aluminum foil barrier layer 2 selects the 45 micron thick alloy model of Japan Toyo Alum...

Embodiment 2

[0030] Such as figure 2 As shown, it is a schematic diagram of a lithium battery flexible packaging film with a corrosion-resistant surface. The flexible packaging film for a lithium battery with a corrosion-resistant surface includes a fluoroplastic layer 1, an aluminum foil barrier layer 2 and a polypropylene heat-sealing layer 3. The fluoroplastic layer 1 It is arranged on the outer side of the aluminum foil barrier layer 2 , and the polypropylene heat-sealing layer 3 is arranged on the inner side of the aluminum foil barrier layer 2 , and the fluoroplastic layer 1 and the aluminum foil barrier layer 2 are bonded by an adhesive 4 . An extruded polypropylene layer 5 is arranged between the aluminum foil barrier layer 2 and the polypropylene heat-sealing layer 3 , and the aluminum foil barrier layer 2 and the polypropylene heat-sealing layer 3 are composited together through the extruded polypropylene layer 5 .

[0031] Fluoroplastic layer 1 uses Honeywell polychlorotrifluor...

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Abstract

The invention provides a surface corrosion-resistant lithium battery flexible package film. The surface corrosion-resistant lithium battery flexible package film is characterized by comprising a fluoroplastic layer, an aluminum foil barrier layer and a polypropylene heat sealing layer. The fluoroplastic layer is arranged on the outer side of the aluminum foil barrier layer. The polypropylene heat sealing layer is arranged on the inner side of the aluminum foil barrier layer. The surface corrosion-resistant lithium battery flexible package film has good heat resistance and chemical corrosion resistance, prevents electrolyte from corroding and damaging the surface layer of an aluminum plastic film and the aluminum foil barrier layer of the aluminum plastic film and has high barrier performance, the barrier performance of the composite film is guaranteed, and a lithium battery with the flexible package film is safer.

Description

technical field [0001] The invention relates to a composite flexible packaging film, in particular to a lithium battery flexible packaging film whose surface is resistant to electrolyte pollution. Background technique [0002] Commonly used lithium battery packaging materials mainly include metal and aluminum-plastic film. Compared with metal packaging, aluminum-plastic film provides a light and low-cost packaging method, but it also puts forward higher requirements for materials. At present, the common aluminum-plastic film generally uses nylon (PA) as the surface layer, but nylon (PA) is easily corroded and has no blocking effect when encountering the electrolyte used in lithium batteries. Therefore, once the surface of the aluminum-plastic film comes into contact with the electrolyte, it will The formation of white spots not only affects the appearance of the lithium battery, but also may infiltrate and corrode the aluminum foil of the barrier layer in severe cases, affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/06B32B15/20B32B15/085B32B7/12H01M2/02
CPCB32B7/12B32B15/085B32B15/20B32B27/06B32B27/322B32B2307/752H01M50/116H01M50/124H01M50/1245Y02E60/10
Inventor 贺爱忠沈均平晁承鹏陈涛
Owner SHANGHAI ZIJIANG NEW MATERIAL TECH CO LTD
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