Corrosion resistant aluminum plastic film for lithium battery packaging

Abstract

The invention discloses a corrosion resistant aluminum plastic film for lithium battery packaging, which mainly comprises a protective layer, an aluminum foil layer and a heat-seal layer. The corrosion resistant aluminum plastic film is characterized in that: the protective layer and the aluminum foil layer are bonded and combined by a cementing layer, the aluminum foil layer and the heat-seal layer are combined by hot pressing; the aluminum foil layer is subjected to surface treatment by adopting anodic oxidation before bonding combination and hot pressing combination; the material of the heat-seal layer is a three-layer co-extrusion polyolefin composite membrane, of which the inner layer is a bonding layer, the middle layer is a structural layer and the outer layer is a blocked layer; the thickness of the protective layer is 10 to 50mu m, the thickness of the aluminum foil layer is 20 to 80mu m and the thickness of the heat-seal layer is 20 to 120mu m. The product, the aluminum plastic film, has the advantages of higher electrolyte resistance property, and package bonding power, and is suitable for high performance lithium battery packaging.

Description

technical field [0001] The invention relates to the field of packaging materials, mainly to the field of packaging materials for soft-pack lithium batteries, and in particular to an aluminum-plastic film for packaging soft-pack lithium batteries. Background technique [0002] Aluminum-plastic film is a composite material composed of an outer protective layer (ON or PET, etc.), an intermediate aluminum foil layer (AL layer), and an inner heat-sealing layer (CPP or PP). bonding. Aluminum-plastic film is the key material for the packaging of flexible packaging lithium battery cells. After the monolithic battery is assembled, it is sealed with aluminum-plastic film to form a battery. The aluminum-plastic film plays a role in protecting the contents. In order to meet the needs of lithium batteries, each layer has high requirements on materials and technologies. [0003] At present, the preparation of aluminum-plastic film on the market mainly includes dry method and thermal met...

AI Technical Summary

Problems solved by technology

The preparation process of this method requires plasma surface treatment for all layers, the process is complicated, the cost is too high, and it is not suitable for industrial production

CN101992570A also discloses an aluminum-plastic film for lithium battery packaging, wherein the material of the heat-sealing layer is at least polyethylene film, polypropylene film, polyethylene-propylene film, unsaturated acid-modified polyethylene film and unsaturated acid-modified One of the polypropylene films, which does not involve the function of improving the electrolyte resistance and there is still room for improvement

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