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Aluminum-plastic extrusion composite film of lithium ion battery and preparation method of composite film

A lithium-ion battery, extrusion compounding technology, applied in battery pack parts, chemical instruments and methods, circuits, etc. Corrosion resistance, poor insulation and other problems, to achieve the effect of enhancing electrolyte resistance, elongation at break, and corrosion resistance

Active Publication Date: 2013-11-20
江苏共巨锂电材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The packaging film disclosed in the prior art is bonded with aluminum foil by dry compounding with coating of cured glue. The packaging film produced by this method has low tensile strength, low tensile strength, poor corrosion resistance and insulation, and will The layers will be peeled off and delaminated, which will affect the safety and life of lithium-ion batteries
[0003] In the currently disclosed technology, the dry composite production process adopted by the battery flexible packaging film, due to the use of solvent-based curing adhesives such as phenolic resin, epoxy resin, and polyurethane adhesive, the organic solvents toluene, ethyl acetate, etc. pollute the ecological environment.

Method used

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  • Aluminum-plastic extrusion composite film of lithium ion battery and preparation method of composite film
  • Aluminum-plastic extrusion composite film of lithium ion battery and preparation method of composite film
  • Aluminum-plastic extrusion composite film of lithium ion battery and preparation method of composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, with reference to figure 1 , an aluminum-plastic extrusion composite film for a lithium-ion battery, which consists of a protective layer 1, a first extrusion layer 2, a first coating 3, an aluminum foil layer 4, a second coating 5, and a second extrusion coating from outside to inside. Layer 6, homopolymer layer 7 and heat-sealing layer 8; the first coating 3 and the second coating 5 are sprayed on the upper and lower sides of the aluminum foil layer 4 respectively, and the protective layer 1 and the first coating 3 pass through the extruded layer 2 Bonding, between the second coating 5 and the heat-sealing layer 8, co-extruded and bonded by the extrusion layer 6 and the homopolymer layer 7;

[0018] The protective layer 1 is a polyethylene terephthalate layer or a biaxially stretched nylon layer;

[0019] The first coating 3 and the second coating 5 contain ammonium molybdate and sodium silicate, and also contain a mixed aqueous solution composed of any...

Embodiment 2

[0023] Embodiment 2, with reference to figure 1 , an aluminum-plastic extrusion composite film for a lithium-ion battery, which consists of a protective layer 1, a first extrusion layer 2, a first coating 3, an aluminum foil layer 4, a second coating 5, and a second extrusion coating from outside to inside. Layer 6, homopolymer layer 7 and heat-sealing layer 8; the first coating 3 and the second coating 5 are sprayed on the upper and lower sides of the aluminum foil layer 4 respectively, and the protective layer 1 and the first coating 3 pass through the extruded layer 2 Bonding, between the second coating 5 and the heat-sealing layer 8, co-extruded and bonded by the extrusion layer 6 and the homopolymer layer 7;

[0024] The protective layer 1 is a polyethylene terephthalate layer or a biaxially stretched nylon layer;

[0025] The first coating 3 and the second coating 5 contain ammonium molybdate and sodium silicate, and also contain a mixed aqueous solution of any composit...

Embodiment 3

[0029] Embodiment 3, with reference to figure 1 , an aluminum-plastic extrusion composite film for a lithium-ion battery, which consists of a protective layer 1, a first extrusion layer 2, a first coating 3, an aluminum foil layer 4, a second coating 5, and a second extrusion coating from outside to inside. Layer 6, homopolymer layer 7 and heat-sealing layer 8; the first coating 3 and the second coating 5 are sprayed on the upper and lower sides of the aluminum foil layer 4 respectively, and the protective layer 1 and the first coating 3 pass through the extruded layer 2 Bonding, between the second coating 5 and the heat-sealing layer 8, co-extruded and bonded by the extrusion layer 6 and the homopolymer layer 7;

[0030] The protective layer 1 is a polyethylene terephthalate layer or a biaxially stretched nylon layer;

[0031] The first coating 3 and the second coating 5 contain ammonium molybdate and sodium silicate, and also contain a mixed aqueous solution composed of flu...

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Abstract

The invention discloses an aluminum-plastic extrusion composite film of a lithium ion battery. The aluminum-plastic extrusion composite film sequentially consists of a protection layer, a first extrusion layer, a first coating layer, an aluminum foil layer, a second coating layer, a second extrusion layer, a homo-polymerizing layer and a heat-sealing layer from outside to inside, wherein the first coating layer and the second coating layer are sprayed on the upper surface and the lower surface of the aluminum foil layer respectively; the protection layer is adhered to the first coating layer through the first extrusion layer; the second coating layer is adhered to the heat-sealing layer by co-extrusion and compositing of the second extrusion layer and the homo-polymerizing layer (7). The invention also discloses a preparation method of the aluminum-plastic extrusion composite film of the lithium ion battery. In order to alleviate oxidation layering of a packaging film caused by corrosion of a battery electrolyte under the high temperature condition, the corrosion resistance and insulating performance of an inner layer of the composite film are improved, and the electrolyte resistance of the composite film is improved; the tension strength, tensile strength and breaking elongation of the whole composite film are improved, and thus punch forming of the composite film is facilitated. The composite film is applicable to packaging of the lithium ion battery, a capacitor and an electrolyte.

Description

technical field [0001] The invention relates to a composite material, in particular to an aluminum-plastic extrusion composite film for a lithium-ion battery, and also relates to a preparation method for the aluminum-plastic extrusion composite film for a lithium-ion battery. Background technique [0002] Lithium-ion batteries have fast charging and discharging functions, and are prone to high temperatures during use. The electrolyte at high temperatures is extremely corrosive, and can oxidize and delaminate the composite layer of the packaging film of the lithium-ion battery. The packaging film disclosed in the prior art is bonded with aluminum foil by dry compounding with coating of cured glue. The packaging film produced by this method has low tensile strength, low tensile strength, poor corrosion resistance and insulation, and will Such layers will peel off and delaminate, which will affect the safety and life of lithium-ion batteries. [0003] The currently disclosed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B15/04B32B27/06B32B27/08B32B37/06B32B37/10B32B33/00H01M50/126H01M50/131H01M50/145
CPCY02E60/12Y02E60/10
Inventor 公建强
Owner 江苏共巨锂电材料有限公司
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