Lithium ion battery housing material plastic-aluminum composite membrane and preparation method thereof

Abstract

The invention relates to the field of battery housing material technology, especially relates to a lithium ion battery housing material plastic-aluminum composite membrane and preparation method thereof; the lithium ion battery housing material plastic-aluminum composite membrane of the present invention has the character that because an external layer is made from a polyamide polymer, which protects the aluminium layer from fracturing during cold stamping forming, after the cold stamping forming, the lithium ion battery can reach the technology requirements such as waterproof, moistureproof, sealing, insulating property and puncture resisting performances. In addition, according to the preparation method provided by the invention, an oxidation treatment solution of the present invention has a certain surface adsorption enhancing effect, thereby refining texture and forming a uniform and compact conversion film with a certain thickness on the aluminium foil surface; the conversion film has excellent adhesion force with the organic coating and has impact performance, or the like, and after the aluminium foil surface is treated by an oxidation treatment, the bonding force of the aluminium foil surface and the high-molecular material is substantially increased; the preparation method has the advantages of simple oxidation treatment solution preparation, relative low control requirement of the technology condition, convenient operation and low cost; because hexavalent chromium with severe toxicity is not contained, the product belongs to the green environmental protection treatment fluid.

Description

technical field [0001] The invention relates to the technical field of battery shell materials, in particular to an aluminum-plastic composite film for a lithium-ion battery shell material and a preparation method thereof. Background technique [0002] Flexible packaging lithium-ion batteries use aluminum-plastic composite film as the shell material of flexible packaging lithium-ion batteries. This aluminum-plastic composite film shell material maintains battery performance by blocking water and oxygen. It is the last quality of battery forming. Guaranteeing the pass has a great impact on battery performance, and is an important part of flexible packaging lithium-ion batteries. [0003] The patent No. is the Chinese patent of ZL99212336, which discloses a flexible packaging film for lithium batteries, including outer, middle and inner three-layer structure, wherein the middle layer is an aluminum layer, and the outer layer is made of polyethylene terephthalate. A low-densit...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a lithium-ion battery shell material aluminum-plastic composite film to solve the problems existing in the current lithium-ion battery shell material aluminum-plastic composite film, such as the adhesion and bonding force between the aluminum foil layer and the polymer layer and the preparation method. Membrane and its preparation method