Flexible package aluminum-plastic membrane applied to lithium ion battery

A lithium-ion battery and aluminum-plastic film technology, which is applied to battery pack components, battery boxes/covers, battery boxes/cover materials, etc., can solve the problem of damage, easy delamination between layers, and adhesive layer that is susceptible to organic solvents damage and other problems, to prolong the service life and solve the effect of interlayer delamination

Active Publication Date: 2014-12-10
乐凯胶片股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The Chinese patent with the patent application number 201210070274.9 discloses a corrosion-resistant, puncture-proof, melt-through and short-circuit aluminum-plastic packaging film for lithium battery appliances and its manufacturing method. The aluminum-plastic packaging film is prepared by a dry method. During long-term use, the coating The interface between the aluminum foil layer and the aluminum foil layer is easily damaged by the electrolyte, and the adhesive layer between the paint layer and the heat-sealing layer is also easily damaged by organic solvents, making it easy to delaminate between the layers.

Method used

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  • Flexible package aluminum-plastic membrane applied to lithium ion battery

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example 1

[0024] 25 μm double-sided stretched PET film, corona treatment on the surface, and then coated with polyurethane adhesive with a dry thickness of 4 μm, combined with 30 μm aluminum foil treated with silane coupling agent and titanate coupling agent on both sides, and heated on the other surface of the aluminum foil While extruding 20 μm acid-modified polyethylene resin, compound 20 μm corona-treated PVDF fluorine film, while hot-extruding 20 μm acid-modified polyethylene resin on the other surface of the fluorine film, compound 20 μm CPP film. Curing at 44°C to 80°C for 1 to 4 days to obtain an aluminum-plastic film.

example 2

[0026] 30μm double-sided stretched PA / PET composite film, surface corona treatment, then coated with 4μm dry polyurethane adhesive, dry composite 40μm aluminum foil with chrome treatment on both sides, hot extruded 30μm chlorine on the other surface of the aluminum foil At the same time as the polypropylene resin is melted, a 30 μm corona-treated PVDF fluorine film is compounded, and a 20 μm polyethylene and acrylic acid copolymer is thermally extruded on the other surface of the fluorine film, and an 80 μm CPP film is compounded. Curing at 44°C to 80°C for 1 to 4 days to obtain an aluminum-plastic film.

example 3

[0028] 20μm double-sided stretched PA film, corona treatment on the surface, then coated with epoxy resin adhesive with a dry thickness of 4μm, dry lamination of 50μm aluminum foil with chrome treatment on both sides, and hot extrusion of 50μm metal ions on the other surface of the aluminum foil At the same time as polyethylene resin, 25μm corona-treated PVF fluorine film is compounded, while 50μm chlorinated polypropylene resin is thermally extruded on the other surface of the fluorine film, and 50μm triethylene propylene rubber / copolymerized PP co-extruded CPP is compounded film. Curing at 44°C to 80°C for 1 to 4 days to obtain an aluminum-plastic film.

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Abstract

The invention belongs to the technical field of novel energy resources and in particular relates to a flexible package aluminum-plastic membrane applied to a lithium ion battery. The aluminum-plastic membrane is of a layer structure and comprises a heat-resistant resin layer, an adhesive layer, an aluminum foil layer, an adhesive resin layer 1, a fluorine membrane layer, an adhesive resin layer 2 and a heat sealing layer in sequence from top to bottom; the surface of the heat-resistant resin layer treated by in a corona manner is coated with the adhesive layer; the other surface of the adhesive layer is compounded with a passivated aluminum foil; the surface of the aluminum foil is compounded with the fluorine membrane layer treated in the corona manner when the adhesive resin layer 1 is hot extruded on the surface of the aluminum foil; the other surface of the fluorine membrane layer is compounded with the hot sealing layer when the adhesive resin layer 2 is hot extruded on the other surface of the fluorine membrane layer. The aluminum-plastic membrane provided by the invention is good in interlayer adhesive performance; the service life of the lithium ion battery can be prolonged.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a flexible aluminum-plastic film for lithium-ion batteries. Background technique [0002] Lithium battery flexible packaging materials, as the shell of the battery core, need to meet the following basic requirements: excellent heat sealability, the inner material does not react with the electrolyte, and the overall performance of the electrolyte resistance, extremely high water and oxygen resistance performance . Usually lithium battery flexible packaging materials include at least three layers: an outer protective layer, a middle aluminum foil barrier layer and an inner heat-sealing layer. The three layers are bonded with resin and prepared by dry method or extrusion composite method. [0003] The Chinese patent with the patent application number 201210070274.9 discloses a corrosion-resistant, puncture-proof, melt-through and short-circuit aluminum-plastic packaging film for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02B32B15/08B32B15/20B32B7/12
CPCB32B7/12B32B15/08B32B15/20H01M50/116Y02E60/10
Inventor 张学建李华锋柳青
Owner 乐凯胶片股份有限公司
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