Aluminum-plastic film for packaging lithium battery and preparation method thereof

Abstract

The invention relates to the technical field of soft package materials for lithium battery packaging, particularly to an aluminum-plastic film for lithium battery packaging and a preparation method thereof. The aluminum-plastic film comprises a polyurethane fiber layer, an aluminum foil layer and a polypropylene heat-sealing layer from top to bottom, wherein the aluminum foil layer is attached tothe polypropylene heat sealing layer; polyurethane fibers are attached to the aluminum foil layer; the polyurethane fiber layer and the aluminum foil layer are bonded through a modified polyolefin adhesive; and the aluminum foil layer and the polypropylene heat-sealing layer are bonded through a polyurethane adhesive. The modified polyolefin adhesive is prepared from the following raw materials inparts by weight: 1 to 5 parts of alpha-methylstyrene dimer, 1 to 3 parts of dibenzoyl peroxide, 15 to 25 parts of modified epoxy resin, 20 to 30 parts of polyolefin, 1 to 5 parts of a curing agent, 0.5 to 3 parts of an antioxidant, 1 to 3 parts of a defoaming agent, 1 to 5 parts of a cross-linking agent and 20 to 40 parts of a solvent. The aluminum-plastic film provided by the invention has excellent barrier property, ductility and corrosion resistance, and also has good heat-sealing sol aluminum leakage prevention effect.

Description

technical field [0001] The invention relates to the technical field of lithium battery packaging soft package materials, in particular to an aluminum-plastic film for lithium battery packaging and a preparation method thereof. Background technique [0002] In recent years, the rapid development of the new energy industry has led to a sharp increase in the application of soft-pack lithium batteries. The soft-packed lithium battery packaged with aluminum-plastic film has the characteristics of flexible shape, good safety performance, and high energy density, which greatly improves the flexibility and applicability of battery design, so that it can be made into a variety of shapes and capacities to meet product needs. The battery provides developers with high design flexibility and adaptability in power solutions. At present, mainstream digital products and electric vehicles mainly use soft-pack lithium batteries. However, ordinary aluminum-plastic films cannot meet the perfor...

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Problems solved by technology

[0004] Another object of the present invention is to provide a method for preparing an aluminum-plastic film for lithium battery packaging. The method adopts a high-low temperature aging process to make the aluminum-plastic film obtained overcome the problem of using a low-temperature 40°C constant-temperature aging process to obtain an aluminum-plastic film in the past. Poor white line after shelling, poor colloidal properties and low peeling force

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