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Aluminum-plastic membrane used for packaging lithium battery

An aluminum-plastic film and lithium battery technology, which is applied in the field of packaging aluminum-plastic film, can solve the problems of poor bonding layer toughness and heat-sealing bonding strength, and achieve the effect of high chemical resistance, packaging adhesion and explosion-proof effect.

Active Publication Date: 2015-03-25
MING CROWN ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention patent application with the publication number CN101350370A discloses a packaging film using PP / ethylene-methacrylic acid copolymer / aluminum foil / ethylene-methacrylic acid copolymer / PP. This series of films has better explosion-proof performance, but the toughness of the bonding layer and Heat seal bond strength is slightly worse

Method used

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  • Aluminum-plastic membrane used for packaging lithium battery
  • Aluminum-plastic membrane used for packaging lithium battery
  • Aluminum-plastic membrane used for packaging lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using a 40 μm thick high-toughness aluminum foil 1, the surface of the aluminum foil is grafted with a plasma gas with a volume ratio of oxygen and nitrogen of 4:6, and then a thermosetting adhesive is applied to the treated surface of the aluminum foil. On the surface, bake at 40-100°C for 1-5 minutes to make a thermosetting adhesive layer 4 with a thickness of 3-10 μm, and then perform surface grafting treatment with plasma gas with argon and nitrogen volume ratio of 3:7 to achieve high wear resistance. The tough polyamide film is compound coated on the treated surface of the aluminum foil with a temperature of 40-100°C and a pressure of 0.2-1kgf to form an outer protective layer 2; then the aluminum foil is treated with a plasma gas with a volume ratio of oxygen and nitrogen of 4:6 the other surface, and apply a thermosetting adhesive on the other treated surface of the aluminum foil, and bake at 40-100°C for 1-5 minutes to form another thermosetting adhesive layer 4 ...

Embodiment 2

[0034] Adopt the high tenacity aluminum foil 1 of 40 μ m thickness, be that the volume ratio of oxygen and nitrogen is 4: 6 plasma gas carries out surface grafting to one surface of aluminum foil; The plasma gas with a nitrogen volume ratio of 3:7 is used for surface grafting treatment. Blend low-density polyethylene and ethylene-vinyl acetate copolymer at a mass fraction of 1:1 and extrude a coating film 10-20 μm thick on the treated surface of the aluminum foil to form a thermoplastic buffer adhesive layer 5, and then treat the polyamide film One surface of the aluminum foil is attached to the extruded film, and the protective layer 2 is compounded at a temperature of 100-160°C and a pressure of 0.5-1.5kgf; then the other surface of the aluminum foil is treated with a plasma gas with a volume ratio of oxygen and nitrogen of 4:6, and the Low-density polyethylene and ethylene-vinyl acetate copolymer are blended and extruded with a mass fraction of 1:1 to form a coating film 10...

Embodiment 3

[0036] A 25 μm thick polyamide film with high wear resistance and toughness is used as the protective layer 2, and the surface of the film is grafted with a plasma gas with a volume ratio of argon and nitrogen of 3:7, and then the thermosetting adhesive is coated. Apply it on the treated surface of the polyamide film, and bake it at 40-100°C for 1-5min to form a thermosetting adhesive layer 4 with a thickness of 3-10μm; use a 50μm-thick unsaturated anhydride-modified polypropylene film as the thermal Sealing layer 3, the surface of the polypropylene film is grafted with a plasma gas with a volume ratio of argon and nitrogen of 3:7, and then a thermosetting adhesive is applied to the treated surface of the polypropylene film , bake at 40-100°C for 1-5min to make another thermosetting adhesive layer 4 with a thickness of 3-10μm; use a high-toughness aluminum foil 1 with a thickness of 40μm, and use a plasma gas with a volume ratio of oxygen and nitrogen of 4:6 to The two surface...

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Abstract

The invention discloses an aluminum-plastic membrane used for packaging the lithium battery. The aluminum-plastic membrane mainly comprises a protective layer, an aluminum foil layer and a heat sealing layer, wherein the protective layer is bound and combined with the aluminum foil layer through a glue layer, the heat sealing layer is bound and combined with the aluminum foil layer through a glue layer; before the binding and combining, the plasma technology is adopted to perform surface grafting treatment to the surfaces of the protective layer, the aluminum foil layer and the heat sealing layer; and then the protective layer and the aluminum foil layer are separately combined with the both sides of one glue layer through hot-pressing, and the aluminum foil layer and the heat sealing layer are are separately combined with the both sides of one glue layer through hot-pressing. The aluminum-plastic membrane has higher chemical resistance, moisture-proof property, oxygen-isolating property and packaging-binding property, also has explosion-proof property and is suitable for the soft package lithium battery.

Description

technical field [0001] The invention relates to a packaging aluminum-plastic film for an explosion-proof soft-pack lithium battery. Background technique [0002] Aiming at the problem that lithium batteries in hard box packaging are easy to release gas during use and the pressure increases, resulting in explosion, a new type of flexible packaging material has begun to appear on the market. This new type of flexible film material can expand and release pressure, thereby preventing explosion. The film material is usually composed of high water vapor barrier aluminum foil and chemical resistance, good heat sealing and flexible polymer film material. [0003] The invention patent application with the publication number CN101350370A discloses a packaging film using PP / ethylene-methacrylic acid copolymer / aluminum foil / ethylene-methacrylic acid copolymer / PP. This series of films has better explosion-proof performance, but the toughness of the bonding layer and The heat seal bond s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/08B32B15/20B32B7/12H01M2/02H01M50/117H01M50/121H01M50/126
CPCY02E60/10
Inventor 张鹏李成利
Owner MING CROWN ADVANCED MATERIAL CO LTD
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