A lithium-ion battery core aluminum-plastic film made by hot-melt adhesive coating process

Abstract

An aluminum-plastic film for lithium-ion battery cores produced by a hot-melt adhesive coating process, which is characterized in that it includes a protective layer, an adhesive layer, a chemical treatment layer I, an aluminum foil layer, a chemical treatment layer II, and a hot-melt adhesive. layer and a heat-sealing layer; the chemical treatment layer is a dense metal oxide film layer formed on the surface of the aluminum foil by chemically treating the surface of the aluminum foil; the dense metal oxide film layer is made of chromium salt, acid, fluoride and water The mixed solution is formed by chemically treating the surface of the aluminum foil; the aluminum-plastic film of the present invention can be used for the packaging of lithium-ion battery cores, and has excellent electrolyte corrosion resistance, good cold stamping performance, heat-sealing performance, and the thickness of the heat-sealing layer can be It can be adjusted online in the range of 20-100 microns, so that battery films of different thicknesses can be produced, and it has the advantages of dry compounding and thermal compounding to make aluminum-plastic films for lithium batteries.

Description

technical field [0001] The invention relates to a lithium-ion battery flexible packaging technology, in particular to an aluminum-plastic film for a lithium-ion battery core produced by a hot-melt adhesive coating process. Background technique [0002] At present, the aluminum-plastic film packaging materials used in flexible packaging lithium-ion batteries are mainly provided by Japan, and the production process is generally divided into dry lamination or thermal lamination. The representative manufacturer of the all-dry process is Showa Denko Corporation of Japan. It is characterized in that the three layers of nylon, aluminum foil, and polypropylene film are bonded with two-component glue. The advantages lie in excellent cold stamping, anti-short circuit, and waterproof properties. Its disadvantage lies in its poor resistance to electrolyte; the representative manufacturer of thermal process is Japan Dainippon Printing Co., Ltd., which is characterized in that the outer n...

AI Technical Summary

Problems solved by technology

The representative manufacturer of the all-dry process is Showa Denko Corporation of Japan. It is characterized in that the three layers of nylon, aluminum foil, and polypropylene film are bonded with two-component glue. The advantages lie in excellent cold stamping, anti-short circuit, and waterproof properties. Its disadvantage lies in its poor resistance to electrolyte; the representative manufacturer of thermal process is Japan Dainippon Printing Co., Ltd., which is characterized in that the outer nylon layer and the aluminum foil layer are bonded with glue, while the inner layer of polypropylene film and the inner layer of aluminum foil are glued together. MPP is then thermally synthesized under the conditions of increasing temperature and pressure. The advantage is that it has excellent electrolyte resistance and heat sealing performance. The disadvantage is that the production process is long, and the aluminum foil is embrittled and the inner layer of polypropylene is caused by long-term high-temperature baking. Aging of the film, which affects the drawing properties, appearance and short-circuit resistance of the material

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