Aluminum-plastic composite film for lithium ion battery soft package and manufacturing method of aluminum-plastic composite film

Abstract

The invention discloses an aluminum-plastic composite film for a lithium ion battery soft package and a manufacturing method of the aluminum-plastic composite film. A surface protecting layer, a heat-conductive material layer, an upper adhesion layer, an upper passivation barrier layer, an aluminum film layer, a lower passivation barrier layer, a lower adhesion layer and a CPP composite film layer are successively superposed on a heat-conductive aluminum-plastic film. The aluminum-plastic composite film for the lithium ion battery soft package comprises the following steps: pretreating double surfaces of a substrate material; coating a pretreated surface of the substrate material with coating; washing the surface of an aluminum foil with water; and coating the upper passivation barrier layer, the lower passivation barrier layer, the upper adhesion layer and the lower adhesion layer. The aluminum-plastic composite film for the lithium ion battery soft package has high strength, airtightness, barrier property, acid and alkali resistance and electrolyte resistance, and meanwhile, facilitates heat conduction. The aluminum foil layer and the heat-conductive material layer have the advantages of quite high stripping strength, machining property, shielding effectiveness and barrier property, good bending property and tensile property, and excellent heat conduction property.

Description

technical field [0001] The invention discloses an aluminum-plastic film and a manufacturing method thereof, in particular to an aluminum-plastic composite film for lithium-ion battery flexible packaging and a manufacturing method thereof. Background technique [0002] At present, with the development of the lithium battery industry, the demand for aluminum-plastic packaging films is increasing. At the same time, the pursuit of high-performance lithium batteries has attracted more and more attention to the requirements for aluminum-plastic films. [0003] In the production of lithium batteries, due to the strong corrosion of the electrolyte, it is necessary to solve the corrosion resistance of the aluminum film. However, due to the poor mechanical processing performance of traditional packaging materials, they are easily damaged during the preparation and molding of lithium batteries, which increases the use of lithium batteries. The possibility of leakage, damage and explosi...

AI Technical Summary

Problems solved by technology

[0004] The invention patent application with the publication number CN101350370A discloses a packaging film using PP ethylene-methacrylic acid copolymer / aluminum foil / ethylene-methacrylic acid copolymer / PP. This series of films has better explosion-proof performance, but the toughness of the bonding layer and heat-sealing bonding strength; another example is that the application publication number is CN101992570A, which discloses a lithium battery packaging aluminum-plastic film, which mainly includes a protective layer, an aluminum foil layer and a heat-sealing layer, and the protective layer and the aluminum foil layer , and the heat-sealing layer and the aluminum foil layer are respectively bonded and compounded by the glue layer, and before the protective layer and the aluminum foil layer, and the heat-sealing layer and the aluminum foil layer are bonded and compounded by the glue layer, the protective layer, the aluminum foil layer and the surface of the heat-sealing layer material are treated with plasma technology surface grafting, and then the protective layer and the aluminum foil layer, as well as the aluminum foil layer and the hot-pressed layer are dry-composited with the two sides of a glued layer.

Although the aluminum-plastic film for lithium battery packaging has high chemical resistance, moisture insulation, oxygen insulation, packaging adhesion and explosion-proof, it is suitable for flexible packaging lithium batteries, but its aluminum foil layer is mechanically processed by bonding the glued layer with heat and pressure. Poor performance, unreliable bonding, and not environmentally friendly due to the use of adhesives

In addition, these films do not have the effect of heat conduction, which is not good for the packaging of lithium batteries