Corrosion-resistant aluminum plastic film for lithium battery

An anti-corrosion, aluminum-plastic film technology, used in batteries, battery pack parts, battery boxes/jackets, etc., can solve the problems of the mechanical properties of aluminum-plastic film decline, poor safety of lithium battery use, damage to packaging structure, etc., to achieve isolation Electrolyte, the effect of improving tensile strength at break and compressive performance, and improving corrosion resistance

Inactive Publication Date: 2019-02-22
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above, the aluminum-plastic film used for lithium battery packaging in the existing scheme is easily corroded by gases such as hydrofluoric acid after the electrolyte is decomposed during use, resulting in a decrease in the mechanical properties of the aluminum-plastic film, and the packaging structure is damaged. Destruction, the use of lithium batteries is less safe

Method used

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  • Corrosion-resistant aluminum plastic film for lithium battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] The anti-corrosion aluminum-plastic film includes a protective layer, an aluminum foil layer and a heat-sealing layer; the thickness of the protective layer is 20 μm; the thickness of the aluminum foil layer is 40 μm; the thickness of the heat-sealing layer is 60 μm.

[0028] The protective layer is a polystyrene layer, which is bonded and compounded with the aluminum foil layer through an adhesive layer; the adhesive layer is an epoxy resin adhesive layer;

[0029] The aluminum foil layer and the heat-sealing layer are laminated by hot pressing;

[0030] The material of the heat-sealing layer is a three-layer co-extruded composite film, the inner layer is a bonding layer, the middle layer is a structural layer, and the outer layer is a barrier layer; wherein, the material of the bonding layer is vinyltrimethoxysilane Bonding layer; the material of the structural layer is composed of 40 parts by weight of fluorinated polyvinyl chloride, 65 parts by weight of perfluoroet...

Embodiment 2

[0032] The anti-corrosion aluminum-plastic film includes a protective layer, an aluminum foil layer and a heat-sealing layer; the thickness of the protective layer is 50 μm; the thickness of the aluminum foil layer is 20 μm; the thickness of the heat-sealing layer is 50 μm.

[0033] The protective layer is a polystyrene layer, which is bonded and compounded with the aluminum foil layer through an adhesive layer; the adhesive layer is an epoxy resin adhesive layer;

[0034] The aluminum foil layer and the heat-sealing layer are laminated by hot pressing;

[0035] The material of the heat-sealing layer is a three-layer co-extruded composite film, the inner layer is a bonding layer, the middle layer is a structural layer, and the outer layer is a barrier layer; wherein, the material of the bonding layer is vinyltrimethoxysilane Bonding layer; the material of the structural layer is composed of 30 parts by weight of fluorinated polyvinyl chloride, 50 parts by weight of perfluoroet...

Embodiment 3

[0037] The anti-corrosion aluminum-plastic film includes a protective layer, an aluminum foil layer and a heat-sealing layer; the thickness of the protective layer is 30 μm; the thickness of the aluminum foil layer is 30 μm; the thickness of the heat-sealing layer is 80 μm.

[0038] The protective layer is a polystyrene layer, which is bonded and compounded with the aluminum foil layer through an adhesive layer; the adhesive layer is an epoxy resin adhesive layer;

[0039] The aluminum foil layer and the heat-sealing layer are laminated by hot pressing;

[0040] The material of the heat-sealing layer is a three-layer co-extruded composite film, the inner layer is a bonding layer, the middle layer is a structural layer, and the outer layer is a barrier layer; wherein, the material of the bonding layer is vinyltrimethoxysilane Bonding layer; the material of the structural layer is composed of 40 parts by weight of fluorinated polyvinyl chloride, 50 parts by weight of perfluoroet...

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Abstract

The invention provides a corrosion-resistant aluminum plastic film for a lithium battery. The corrosion-resistant aluminum plastic film comprises a protective layer, an aluminum foil layer and a heatsealing layer; the protective layer is adhered to and compounded with the aluminum foil layer by a cementing layer; the aluminum foil layer is compounded with the heat sealing layer by hot pressing; the aluminum foil layer is compounded with the heat sealing layer by hot pressing; and the heat sealing layer is made of a three-layer co-extrusion composite film, the inner layer is a bonding layer, the middle layer is a structural layer, the outer layer is a barrier layer which is made of a casting polypropylene film, and a material of the structural layer is composed of fluorinated polyvinyl chloride, perfluoroether rubber and nanometer carbon black. Due to the arrangement of the structural layer containing fluorinated polyvinyl chloride, the perfluoroether rubber and nanometer carbon black,the obtained aluminum plastic film is capable of resisting to hydrofluoric acid and also has relatively good mechanical properties; and meanwhile, due to the combined action of the structural layer and the barrier layer, the effect of completely isolating an electrolyte is achieved, the whole structure of the aluminum plastic film is supported, and the mechanical properties are improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to the preparation of anti-corrosion films, in particular to an anti-corrosion aluminum-plastic film for lithium batteries. Background technique [0002] Lithium-ion batteries have developed rapidly due to their excellent performance since their inception. Among them, the development of aluminum-plastic film for packaging has become an important guarantee for the safety of lithium-ion batteries. The current aluminum-plastic film can be roughly divided into three layers: the inner layer is an adhesive layer, mostly made of polyethylene or polypropylene material, which plays a role of sealing and bonding. The middle layer is aluminum foil, which can prevent the infiltration of water vapor from the outside of the battery and prevent the infiltration of the internal electrolyte. The outer layer is a protective layer, mostly made of polyester or nylon with high melting point, which has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M50/116H01M50/124
CPCH01M2200/10H01M50/116H01M50/124Y02E60/10
Inventor 陈庆
Owner CHENDU NEW KELI CHEM SCI CO LTD
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