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Composite aluminum-plastic film for power battery

A power battery and composite aluminum technology, which is applied in the field of composite aluminum-plastic film, can solve the problems of short service life of lithium-ion batteries, poor electrolyte resistance of aluminum-plastic film materials, adhesive force, and limitations in stamping and forming performance. Resistance to electrolyte corrosion, avoiding the entry of water vapor and oxygen, and enhancing the effect of corrosion resistance

Active Publication Date: 2020-12-01
GUANGDONG ANDELI NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current improvements to the aluminum-plastic film of lithium-ion batteries are limited to the improvement of a certain substance or the single improvement of the adhesive that plays a connecting role, and the aluminum-plastic film material obtained after the improvement still has poor electrolyte resistance. Phenomenon, as well as adhesive force and stamping performance are limited to a certain extent, which leads to the problem of short service life of lithium-ion batteries

Method used

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  • Composite aluminum-plastic film for power battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] A composite aluminum-plastic film for power batteries, mainly composed of an aluminum foil layer, a polypropylene layer and an outer protective layer by co-extrusion through a casting process, and the aluminum foil layer and the outer protective layer are bonded by a first adhesive , the aluminum foil layer and the polypropylene layer are bonded by a second adhesive;

[0046] The outer protective layer is composed of a nylon film and a protective layer coated on the surface of the nylon film. The protective layer includes 1% phenol novolac epoxy resin, 70% polyvinylidene chloride resin emulsion and the balance of ethanol;

[0047] The first binder includes the following raw materials in parts by weight: 10 parts of polyester polyol, 5 parts of polyether polyol, 3 parts of single-walled carbon nanotubes, 0.1 part of toluene diisocyanate, 2 parts of bisphenol A epoxy resin, 0.2 parts of silane coupling agent, 3 parts of acetylacetone blocked polyisocyanate, 50 parts of et...

Embodiment 2

[0050] A composite aluminum-plastic film for power batteries, mainly composed of an aluminum foil layer, a polypropylene layer and an outer protective layer by co-extrusion through a casting process, and the aluminum foil layer and the outer protective layer are bonded by a first adhesive , the aluminum foil layer and the polypropylene layer are bonded by a second adhesive;

[0051] The outer protective layer is composed of a nylon film and a protective layer coated on the surface of the nylon film. The protective layer includes 35% o-cresol novolac epoxy resin, 78% polyvinyl acetate emulsion and the balance of ethanol;

[0052] The first binder includes the following raw materials in parts by weight: 12 parts of acrylic-modified polyester polyols, 8 parts of epoxy resin-modified polyether polyols, 4 parts of multi-walled carbon nanotubes, 0.3 parts of toluene diisocyanate, 3 parts of epoxy resin, 0.4 part of silane coupling agent, diethyl malonate 4 parts of ester-blocked po...

Embodiment 3

[0055] A composite aluminum-plastic film for power batteries, mainly composed of an aluminum foil layer, a polypropylene layer and an outer protective layer by co-extrusion through a casting process, and the aluminum foil layer and the outer protective layer are bonded by a first adhesive , the aluminum foil layer and the polypropylene layer are bonded by a second adhesive;

[0056] The outer protective layer is composed of a nylon film and a protective layer coated on the surface of the nylon film. The protective layer includes 5% bisphenol A novolac epoxy resin, 85% polyacrylate emulsion and the balance of ethanol;

[0057] The first binder includes the following raw materials in parts by weight: 10 parts of acrylic-modified polyester polyol, 10 parts of acrylic-modified polyether polyol, single-walled carbon nanotubes and multi-walled carbon with a mass ratio of 1:8 5 parts of mixture of nanotubes, 0.5 parts of toluene diisocyanate, epoxy resin 2- 5 parts, 0.5 parts of sil...

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Abstract

The invention discloses a composite aluminum-plastic film for a power battery. The composite aluminum-plastic film is mainly formed by co-extrusion compounding of an aluminum foil layer, a polypropylene layer and an external protective layer through a tape casting process, wherein the aluminum foil layer and the external protective layer are bonded through a first binder, and the aluminum foil layer and the polypropylene layer are bonded through a second binder. According to the composite aluminum-plastic film for the power battery, all the functional layers and the binders are integrally improved, so the composite aluminum-plastic film for the power battery is provided; and the composite aluminum-plastic film is excellent in electrolyte resistance and has good binding power, stamping forming performance, tensile property and the like.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a composite aluminum-plastic film for power batteries. Background technique [0002] Lithium-ion power batteries are known as the "green chemical energy" of the 21st century. They have been widely used in many fields such as 3C consumer electronics, power batteries, and energy storage. Aluminum-plastic film is a key material for soft-pack lithium-ion batteries. With high technological content, the performance of the aluminum-plastic film directly determines the quality of the lithium-ion battery. The aluminum-plastic film can be roughly divided into three layers: the inner layer is an adhesive layer, mostly made of polypropylene material, which plays the role of sealing and bonding, and the middle layer is aluminum foil, which can prevent the infiltration of water vapor from the outside of the battery and prevent the leakage of the internal electrolyte. ; The outer layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B15/085B32B15/20B32B15/088B32B27/34B32B33/00B32B7/12
CPCB32B27/32B32B15/085B32B15/20B32B15/088B32B27/34B32B33/00B32B7/12B32B2255/10B32B2255/26B32B2307/31B32B2307/54B32B2307/714Y02E60/10H01M50/129H01M50/1245H01M50/105C23C22/33C09J175/04C09J133/04C09J201/00C09J7/00C08K3/041C08G18/4018C08G18/58C08G18/7621C08L23/26C08L27/06C08L31/04C08K5/5415B32B2323/10B32B2311/24
Inventor 吴安理陈汉城王桂彬吴淑芬熊泽民温虹钰
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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