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Aluminum-plastic membrane used for packaging lithium battery

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

Active Publication Date: 2011-03-30
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 40um 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 3-10um, and then perform surface grafting treatment with argon and nitrogen with a 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, bake at 40-100°C for 1-5 minutes to form another thermosetting adhesive layer 4 with a thicknes...

Embodiment 2

[0034] Adopt 40um thick high tenacity aluminum foil 1, carry out surface graft treatment to one surface of aluminum foil with the plasma gas of the volume ratio of oxygen and nitrogen of 4:6; 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 10-20um thick on the treated surface of aluminum foil to form a thermoplastic cushioning adhesive layer 5, and then polyamide film treated One surface 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 coat the other surface of the aluminum foil with a ...

Embodiment 3

[0036] A 25um 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. Spread it on the treated surface of the polyamide film, bake it at 40-100°C for 1-5 minutes, and make a 3-10um thick thermosetting adhesive layer 4; use a 50um thick unsaturated acid anhydride modified polypropylene film as the heat-sealing layer 3. Carry out surface grafting treatment on one surface of the polypropylene film with a plasma gas with a volume ratio of argon and nitrogen of 3:7, and then apply a thermosetting adhesive on the treated surface of the polypropylene film to Bake at 40-100°C for 1-5 minutes to form another thermosetting adhesive layer 4 with a thickness of 3-10um; use a 40um-thick high-toughness aluminum foil 1, and use a plasma gas with a volume ratio of oxygen and nitrogen of 4:6 to treat the...

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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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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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