Lithium ion battery packaging film and manufacturing method thereof

Abstract

The invention relates to a lithium ion battery packaging film which has a layered pressing structure, and a manufacturing method thereof comprises the following steps: fetching an aluminum foil after chemical hydrofluoric acid control processing, wherein the thickness of the aluminum foil is 0.01-1.0mm; fetching a nylon film with the thickness of 0.01-0.1mm; fetching a CPP (polypropylene) film with the thickness of 0.01-0.1mm; and overlaying the CPP film, the aluminum foil and the nylon film together and hot-pressing. The lithium ion battery packaging film has no bonding layer, namely, does not contain various hot melt adhesives, in other words, has no matters that are corroded by lithium ion battery electrolytes and hydrofluoric acid, thereby the lithium ion battery packaging film can not be layered, and has good compactness, less pore spaces, long service life and more than 20 years of life span. The lithium ion battery packaging film is formed by directly and physically pressing, and various hot melt adhesives are unnecessary to be coated among the layers, namely, the hot melt adhesives are saved; the invention has short manufacturing process and low material cost; and meanwhile, the product is suitable for manufacturing large-capacity batteries.

Description

technical field [0001] The invention relates to a lithium ion battery packaging film and a manufacturing method thereof, in particular to a special packaging film for soft packaging lithium ion batteries and polymer lithium ion batteries and a manufacturing method thereof. Background technique [0002] An invention patent application with a document number of CN101197431A discloses a laminated film covering battery elements for a lithium-ion battery pack. The laminated film structure is an outer packaging layer / metal layer / sealant layer, such as Ny / Al / CPP, The three layers are bonded together through the adhesive layer; according to the material type of the middle metal layer, it can be divided into flexible laminated film and rigid laminated film, and the flexible laminated film and rigid laminated film are bonded through the thermal adhesive layer. Together; the thermal adhesive layer is formed by coating hot melt resins such as ethylene vinyl alcohol resin and ethylene-vi...

AI Technical Summary

Problems solved by technology

This invention requires a flexible laminated film and a rigid laminated film to form a lithium-ion battery laminated film (equivalent to a lithium-ion battery packaging film), and each layer of the flexible laminated film and the rigid laminated film needs to be bonded by an adhesive layer Together, the resulting lithium-ion battery packaging film is expensive, and each adhesive layer is easily delaminated and dense under the corrosion of the electrolyte (mainly composed of carbonates and lithium hexafluorophosphate) and HF (hydrofluoric acid). Poor performance, many pores, short service life, the service life is generally two years

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