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Composite film for fully plastic lithium battery

A lithium battery and composite film technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of complex process, battery scrap, aluminum foil corrosion, etc., and achieve high heat sealing, low cost, and good chemical resistance.

Active Publication Date: 2016-01-13
江苏锦尚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the flexible packaging of lithium-ion batteries on the market is all composite films containing aluminum foil, and almost all of them are imported from Japan. The aluminum foil used in the aluminum-plastic film needs special chemical anti-corrosion treatment. The battery is often scrapped because the aluminum foil is corroded by the electrolyte, causing leakage, flatulence, and delamination.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Use 30 μm chlorotrifluoroethylene homopolymer film as the barrier layer; dry composite two-component glue with electrolyte resistance is used as the glue layer, the thickness of the glue layer is 4 μm; 76 μm polypropylene and cycloolefin copolymer The multi-layer mixture film is used as a heat-sealing layer, and the three materials are composited and formed by a dry laminating machine. The thickness of the finished product is 110 μm.

Embodiment 2

[0024] Use 25μm polyvinylidene fluoride film as the barrier layer; dry composite two-component glue with electrolyte resistance as the adhesive layer, the thickness of the adhesive layer is 4μm; 82μm multi-layer mixture film of polypropylene and cycloolefin copolymer as heat seal Layer, the three materials are compounded and formed by a dry compound machine. The thickness of the finished product is 111 μm.

Embodiment 3

[0026] Use 80 μm multi-layer interlaced high-density polyethylene film as the barrier layer; hot melt adhesive with electrolyte resistance as the adhesive layer, the thickness of the adhesive layer is 20 μm; 50 μm multi-layer mixture film of polypropylene and cycloolefin copolymer as the The heat-sealing layer is formed by compounding the three materials through an extrusion compounding machine. The thickness of the finished product is 150 μm.

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PUM

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Abstract

The invention discloses a composite membrane for an all-plastic lithium battery. The composite membrane for the all-plastic lithium battery is formed through combining a blocking layer, an intermediate adhesive layer and a thermal seal layer; materials of a protective layer have a favorable barrier property, can block substances of oxygen, steam and the like from entering the battery to damage the battery, and also have a favorable forming property, a light shielding property and high intensity; the intermediate adhesive layer has a favorable bonding property and chemical resistance, and can resist corrosion by electrolyte; and the thermal seal layer has favorable spontaneous heat seal and tab heat seal performances, and has a good blocking property to reduce the damage to the adhesive layer by the electrolyte. The composite membrane does not contain aluminum foil, has the performances of high blocking, easiness in forming, high heat seal, great electrolyte corrosion resistance and the like, can be used for packaging lithium ion battery cells, and has the advantages of light weight, low cost, easiness in processing and the like.

Description

technical field [0001] The invention relates to a composite film for a lithium battery, in particular to a composite film for an all-plastic lithium battery. Background technique [0002] At present, the flexible packaging of lithium-ion batteries on the market is all composite films containing aluminum foil, and almost all of them are imported from Japan. The aluminum foil used in the aluminum-plastic film needs special chemical anti-corrosion treatment. The battery is often scrapped because the aluminum foil is corroded by the electrolyte, causing leakage, flatulence, and delamination. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a complete, stable and low-cost all-plastic composite membrane for lithium batteries in view of the deficiencies of the prior art. [0004] The technical problem to be solved in the present invention is achieved through the following technical solutions, a composite film for an all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08H01M2/02B32B37/12
CPCY02E60/10
Inventor 单宁张兴洋于广省何建忠徐根华张军梁裕波江灿灿伏阳陈强吴新上
Owner 江苏锦尚新材料有限公司