Special copper-aluminum alloy foil composite moistureproof and heatproof film

Abstract

The invention discloses a special copper-aluminum alloy foil composite moistureproof and heatproof film. The film is formed by using a copper-aluminum alloy foil as a middle base layer, attaching a second nano Al2O3 layer on the upper surface of the copper-aluminum alloy foil, attacking a polypropylene and nylon copolymer film on the upper surface of the second nano Al2O3 layer, attacking a firstnano Al2O3 layer on the lower surface of the copper-aluminum alloy foil and attaching a polypropylene layer on the lower surface of the first nano Al2O3 layer; each of the first nano Al2O3 layer and the second nano Al2O3 layer is formed by coating the copper-aluminum alloy foil with nano Al2O3, heating for treatment and coating the outer surface of the copper-aluminum alloy with nano blocking andinsulating coating liquid. The special copper-aluminum alloy foil composite mmoistureproof and heatproof film has excellent insulativity, resistance to cold stamping and corrosion, high blocking performance and high strength.

Description

Technical field: [0001] The invention relates to the field of packaging films, in particular to a special copper-aluminum alloy foil composite moisture-proof and heat-insulating film. Background technique: [0002] Chinese patent (patent number: ZL02163383.6) discloses a lithium battery flexible packaging film based on an ordinary aluminum layer, the inner layer of polycaprolactam or polyhexamethylene adipamide layer, and the outer layer of ordinary biaxial stretching Polypropylene and nylon copolymer films, as well as other similar invention patents, have the following common functional defects: 1. The aluminum layer is easily broken when it is formed by cold stamping, causing electrolyte leakage. 2. The barrier performance is poor. Due to the difference in tensile properties between the polypropylene and nylon copolymer film and the copper-aluminum alloy foil layer, the polypropylene and nylon copolymer film and the aluminum layer are easily delaminated during cold stampin...

AI Technical Summary

Problems solved by technology

[0002] Chinese patent (patent number: ZL02163383.6) discloses a lithium battery flexible packaging film based on an ordinary aluminum layer, the inner layer of polycaprolactam or polyhexamethylene adipamide layer, and the outer layer of ordinary biaxial stretching Polypropylene and nylon copolymer films, as well as other similar invention patents, have the following common functional defects: 1. The aluminum layer is easily broken when it is formed by cold stamping, causing electrolyte leakage

2. The barrier performance is poor. Due to the difference in tensile properties between the polypropylene and nylon copolymer film and the copper-aluminum alloy foil layer, the polypropylene and nylon copolymer film and the aluminum layer are easily delaminated during cold stamping, resulting in a decrease in barrier performance

3. Insufficient insulation and corrosion resistance treatment of the aluminum layer leads to poor insulation performance of the molded flexible packaging film, which is prone to inner layer flatulence or breakdown by electrodes

High battery scrap rate and short service life

The existence of the above main functional defects is the main reason why lithium flexible packaging films have not been widely used in the market

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