Double aluminum layer type aluminum plastic film applied to polymer lithium ion battery

Abstract

The invention relates to a double aluminum layer type aluminum plastic film applied to a polymer lithium ion battery. The aluminum plastic film comprises a polypropylene layer, an adhesion layer, an aluminum foil layer, an adhesion layer, a resin film layer, an adhesion layer, an aluminum foil layer, an adhesion layer and a resin film layer, wherein from interior to exterior the polypropylene layer, the adhesion layer, the aluminum foil layer, the adhesion layer, the resin film layer, the adhesion layer, the aluminum foil layer, the adhesion layer and the resin film layer are sequentially arranged in the aluminum plastic film. According to the double aluminum layer type aluminum plastic film applied to the polymer lithium ion battery, an aluminum foil and resin composition film layer is additionally arranged on the outer layer of the inner-layer aluminum foil, so that the barrier property and the wear resistance of the inner-layer aluminum foil can be effectively improved; the double aluminum layer type aluminum plastic film is a high-barrier aluminum plastic film and can be applied to the polymer lithium ion battery.

Description

technical field [0001] The invention relates to the field of battery packaging materials, in particular to a double-aluminum-layer aluminum-plastic film applied to a polymer lithium-ion battery. Background technique [0002] Due to the advantages of light weight, large capacity, long cycle life (more than 1000 times) and no memory effect, lithium-ion batteries are rapidly expanding in battery applications such as mobile phones and notebook computers. At the same time, due to the unique advantages of lithium-ion batteries, they have been There are applications in the fields of power batteries and energy storage batteries. [0003] Polymer batteries have more advantages than liquid lithium-ion batteries, such as lighter weight, high voltage, large capacity, long life, low self-discharge, no memory effect and safety. With the wide application of 3C products, coupled with the development of lithium-ion battery electric vehicles, the application of polymer lithium-ion batteries ...

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Problems solved by technology

[0004] Since the electrolyte in lithium-ion batteries contains fluorine-containing substances such as aluminum hexafluorophosphate, these fluorine-containing compounds are very sensitive to water, and the electrolyte can easily generate highly corrosive hydrofluoric acid and other gases when it meets water. It will cause corrosion to the heat seal and material of the aluminum-plastic film, seriously affect the cycle number and service life of the battery, and cause the battery to fail rapidly. Destruction of the electrolyte

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