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Lithium-ion battery and aluminum-plastic film

A technology of aluminum-plastic film and aluminum foil layer, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor packaging air tightness, packaging corrosion, easy scratches, etc., and achieve strong thermal resistance and safety. High, long service life effect

Active Publication Date: 2021-11-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the soft aluminum-plastic film packaging also has problems such as easy scratches, poor airtightness of the package, and corrosion of the package.

Method used

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  • Lithium-ion battery and aluminum-plastic film
  • Lithium-ion battery and aluminum-plastic film
  • Lithium-ion battery and aluminum-plastic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of negative electrode sheet

[0027] Negative electrode active material artificial graphite, carbon black conductive agent SP, binder styrene-butadiene rubber, thickener CMC (carboxymethyl cellulose) are mixed according to weight ratio 96.2:1.5:1.5:0.8, add solvent deionized water, Stir and mix evenly under vacuum conditions to obtain the negative electrode slurry; evenly coat the negative electrode slurry on the copper foil of the negative electrode current collector, and then dry it at 80-90°C for cold pressing, trimming, cutting, and stripping , and then dried at 110° C. under vacuum for 4 hours to obtain a negative electrode sheet.

[0028] 2) Preparation of positive electrode sheet

[0029] The cathode active material LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 (NCM333), carbon black conductive agent SP, and binder polyvinylidene fluoride are mixed according to a weight ratio of 97:2:1, and solvent N-methyl pyrrolidone is added, stirred and mixed evenly under va...

Embodiment 2

[0036] The thickness of the nylon cast film protective layer is 20 μm, the material of the first bonding layer is epoxy resin, the thickness is 2 μm, the material of the high temperature resistant layer is borosilicate carbon, the thickness is 10 μm, and the material of the second bonding layer is epoxy resin , the thickness is 3 μm, the thickness of the aluminum foil layer is 25 μm, the material of the third bonding layer is epoxy resin, the thickness is 4 μm, the thickness of the polypropylene cast film heat seal layer is 25 μm, and the total thickness of the aluminum-plastic film is 89 μm.

Embodiment 3

[0038] The thickness of the protective layer of the nylon cast film is 25 μm, the material of the first adhesive layer is acrylic resin, the thickness is 2.5 μm, the material of the high temperature resistant layer is reinforced C-C composite material, the thickness is 15 μm, the material of the second adhesive layer is acrylic resin, the thickness is The thickness of the aluminum foil layer is 2.5 μm, the thickness of the third bonding layer is acrylic resin, the thickness is 2.5 μm, the thickness of the heat-sealing layer of the polypropylene cast film is 25 μm, and the total thickness of the aluminum-plastic film is 100.5 μm.

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Abstract

The invention discloses a lithium ion battery and an aluminum-plastic film, wherein the aluminum-plastic film includes a protective layer, a first adhesive layer, a high temperature resistant layer, a second adhesive layer, an aluminum foil layer, a third adhesive layer and a thermal Sealing layer, the first bonding layer is between the protective layer and the high temperature resistant layer, the second bonding layer is between the high temperature resistant layer and the aluminum foil layer, and the third bonding layer is between the aluminum foil layer and the heat sealing layer . Compared with the prior art, the aluminum-plastic film of the present invention has the advantages of electrolyte corrosion resistance, waterproof, oxygen insulation, high temperature resistance, explosion-proof and strong packaging adhesion, and can be widely used in flexible packaging lithium-ion batteries. The obtained lithium-ion batteries Strong heat resistance, high safety performance and long service life.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a lithium-ion battery and an aluminum-plastic film. Background technique [0002] Lithium-ion batteries are widely used in the fields of digital products and electric vehicles. The packaging forms of lithium-ion battery outer packaging shells mainly include cylindrical, square hard shells and soft aluminum-plastic films. Compared with other packaging materials, when the heat of the battery core is out of control, the aluminum-plastic film-packed battery will be broken first, which can release the gas generated during the use of the lithium-ion battery and prevent the battery from exploding. At the same time, the aluminum-plastic film-packed soft The space utilization rate of the battery pack is high, and the energy density is high. However, soft aluminum-plastic film packaging also has problems such as easy scratches, poor airtightness of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/34B32B15/20B32B7/12B32B15/085B32B27/32H01M50/126H01M50/119H01M50/121H01M10/0525H01M50/124
CPCB32B5/02B32B9/00B32B9/045B32B9/041B32B27/34B32B15/20B32B7/12B32B15/085B32B27/32H01M10/0525B32B2262/106B32B2262/10B32B2307/73B32B2307/7242B32B2307/306B32B2307/752B32B2307/584B32B2457/10H01M50/124Y02E60/10
Inventor 马云建喻鸿钢张玮郭颍歌金海族
Owner CONTEMPORARY AMPEREX TECH CO
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