Anti-corrosion, anti-puncture and anti-short circuit melting through aluminum-plastic packaging film for lithium battery and manufacture method thereof

A kind of aluminum-plastic packaging film, corrosion-resistant technology, used in circuits, battery pack parts, chemical instruments and methods, etc. Problems such as low puncture strength, to achieve the effect of improving puncture resistance, improving corrosion resistance, and excellent electrolyte resistance

Active Publication Date: 2012-07-25
东莞市金恒晟新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this packaging material has the following disadvantages, causing the battery to be scrapped during use
[0004] (1) The heat-resistant resin film on the surface has poor corrosion resistance and is not resistant to electrolyte. When the electrolyte contacts the surface of the packaging film during production, it will dissolve and corrode, making the battery scrap
[0005] (2) During heat sealing, when the temperature is too high or the pressure is too high, the thermoplastic resin film layer of the packaging film and the tab heat sealant will melt through the tab and the packaging film, causing the metal tab and the aluminum foil of the packaging film to melt. The core layer contacts, causing the battery to short circuit
[0006] (3) The puncture strength of the aluminum-plastic film is low, and it is easy to be scratched or even punctured during the production and use of the battery
It is easy to be worn during use, so that the aluminum foil layer is oxidized and damaged

Method used

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  • Anti-corrosion, anti-puncture and anti-short circuit melting through aluminum-plastic packaging film for lithium battery and manufacture method thereof
  • Anti-corrosion, anti-puncture and anti-short circuit melting through aluminum-plastic packaging film for lithium battery and manufacture method thereof
  • Anti-corrosion, anti-puncture and anti-short circuit melting through aluminum-plastic packaging film for lithium battery and manufacture method thereof

Examples

Experimental program
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Effect test

specific Embodiment 1

[0048] First, take the acid-modified polypropylene resin and mold it through a co-extrusion casting machine to prepare an acid-modified polypropylene film (co-extrusion cast non-stretch film) with a thickness of 30 microns for use; secondly, take the thickness Nylon (PA, Polyamide) with a thickness of 25 microns, polyimide (PI, Polyimide) film with a thickness of 30 microns, polyethylene terephthalate (PET) with a thickness of 20 microns , Polyethylene Terephthalate) film as a spare; then, take an annealed soft high-formability aluminum foil (Al) with a thickness of 40 microns as the aluminum foil layer 4, and coat a layer of thickness on both sides of the aluminum foil layer 4 by gravure printing A solvent made of 99% polymethyl methacrylate (PMMA, PolymethylMethacrylate) dissolved in 1% ethyl acetate to form a corrosion-resistant coating layer 4 with a thickness of 3 microns; Aluminum foil layer 4 is coated with 4 micron thick modified polyurethane and curing agent (wherein,...

specific Embodiment 2

[0053] First, the ethylene-acrylate copolymer resin (EEA) is molded by a co-extrusion casting machine to prepare an ethylene-acrylate copolymer film (co-extrusion casting fee stretch film) with a thickness of 40 microns for use; Secondly, take nylon (PA) with a thickness of 15 microns, polyethylene terephthalate (PET) film with a thickness of 30 microns, and polyimide (PI) film with a thickness of 40 microns for backup; Next, take the annealed soft high-formability aluminum foil (Al) with a thickness of 40 microns as the aluminum foil layer 4, and coat a layer of 85% polyformaldehyde with a thickness of 3 microns on both sides of the aluminum foil layer 4 by dip coating. Methyl acrylate (PMMA) and polyvinylidene fluoride (PVDF) are mixed at a ratio of 1:1 and dissolved in a solvent made of 15% ethyl acetate to form a corrosion-resistant coating layer 4; One side of the aluminum foil layer 4 is coated with a self-polymer of 2 microns of modified polyurethane and curing agent po...

specific Embodiment 3

[0058] First, take acid-modified polypropylene resin, ethylene-acrylate copolymer, metal ion cross-linked polyethylene resin, copolymer of ethylene and acrylic acid derivatives, and copolymer of ethylene and methacrylic acid derivatives through a co-extrusion casting machine Forming to make a five-layer co-extruded film (co-extruded cast non-stretched film) with a thickness of 45 microns for use; then, take a polyethylene terephthalate film (PET) with a thickness of 30 microns , a polyethylene terephthalate film (PET) with a thickness of 20 microns and a polyaryl ketone resin film with a thickness of 15 microns for use; then, take an annealed soft-state high-formability film with a thickness of 30 microns Aluminum foil (Al) is used as the aluminum foil layer 4, which is made of 90% polymethyl methacrylate (PMMA) dissolved in 10% ethyl acetate with a thickness of 1 micron on both sides of the aluminum foil layer 4 by dip coating. solvent to form a corrosion-resistant paint laye...

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Abstract

The invention discloses an anti-corrosion, anti-puncture and anti-short circuit melting through aluminum-plastic packaging film for lithium battery and a manufacture method thereof. The aluminum-plastic packaging film has a layer structure, comprises at least seven layers which are respectively to be a protecting layer A, an adhesive layer, a coating material layer, an aluminum foil layer, another coating material layer, another coating material layer and a heat-seal layer, and further comprises a protecting layer B arranged on the protecting layer A by the adhesive layer and/or a protecting layer C arranged between the coating material layer and the adhesive layer at the lower surface of the aluminum foil layer through another adhesive layer. According to the invention, the corrosion of electrolyte can be effectively stopped, the anti-puncture intensity, the tensile strength and the wear-resistant property of the aluminum-plastic film can be improved, the yield and the reliability of the battery can be improved, the heat-seal short circuit caused by the improper operation or the abnormal temperature of a machine during heat sealing can be completely avoided, and the service life of the battery can be greatly prolonged, so that the invention is high in reliability.

Description

technical field [0001] The invention relates to the technical field of packaging films for lithium batteries, in particular to an aluminum-plastic packaging film with corrosion resistance, puncture resistance, melt-through short circuit protection and a manufacturing method thereof. Background technique [0002] With the rise of new energy vehicles in recent years, the demand for long-life, large-capacity, and high-power power batteries is increasing. Polymer lithium-ion batteries are naturally safe and free in shape. It is very convenient to make large and thin batteries. It is not only convenient to make large-capacity lithium-ion battery single cells, but also conducive to the heat dissipation of the battery. Therefore, it has become the first choice for power batteries. Correspondingly, polymer power batteries put forward higher requirements for the reliability and service life of their packaging materials, aluminum-plastic packaging films. [0003] Chinese patents 200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/08B32B15/20B32B7/12B32B37/12B32B38/16B32B37/15H01M2/02
CPCY02E60/12Y02E60/10
Inventor 欧阳少波陈宇新吴明选陈立宝
Owner 东莞市金恒晟新材料科技有限公司
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