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Aluminum-plastic composite membrane for lithium battery shell encapsulation

A technology of aluminum-plastic composite film and lithium battery, which is applied in the field of aluminum-plastic composite film, can solve the problems of internal composite strength decrease, insufficient packaging strength, and outer surface separation layer, etc., and achieve the improvement of elongation at break, the improvement of insulation performance, and the improvement of The effect of insulation performance

Pending Publication Date: 2018-07-24
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an aluminum-plastic composite film for lithium battery casing packaging, which solves the problem that the existing aluminum-plastic composite film has insufficient packaging strength after molding in this field, and the outer surface is prone to separation under long-term use. layer, the internal composite strength decreases, and even the battery core may fall off under impact

Method used

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  • Aluminum-plastic composite membrane for lithium battery shell encapsulation
  • Aluminum-plastic composite membrane for lithium battery shell encapsulation
  • Aluminum-plastic composite membrane for lithium battery shell encapsulation

Examples

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Embodiment 1

[0028] An aluminum-plastic composite film, whose interlayer structure includes: a reinforcement layer 1, an adhesive layer 2, a pitting layer 3, an insulating layer 4, a chemical-resistant film layer 5, and a heat-sealing layer 6. The reinforcement layer 1 is a polyamide film with a thickness of 25 μm; the adhesive layer is a polyurethane adhesive with a thickness of 2 μm; the pitting layer 3 is 500 nm in thickness, and its surface is pitted, and its structure is a dense hexagonal chemical microstructure. The pitting hole has a depth of 400nm and a side length of 500nm; the insulating layer 4 is an alloy aluminum foil with a thickness of 40μm; the chemical-resistant film layer 5 is an electroplating protective film formed by surface electroplating, and its thickness is 200nm; the heat-sealing layer 6 is a polypropylene film , with a thickness of 48 μm.

Embodiment 2

[0030] An aluminum-plastic composite film, whose interlayer structure includes: a reinforcement layer 1, an adhesive layer 2, a pitting layer 3, an insulating layer 4, a chemical-resistant film layer 5, and a heat-sealing layer 6. The reinforcement layer 1 is a composite film composed of polyamide film and polyethylene terephthalate film, with a thickness of 25 μm; the adhesive layer is epoxy resin adhesive, with a thickness of 2 μm; the pitting layer 3 has a thickness of 500 nm , pitting treatment on its surface, the structure is dense hexagonal chemical micro-pitting holes, the depth is 400nm, and the side length is 500nm; the insulating layer 4 is alloy aluminum foil, the thickness is 40μm; the chemical-resistant film layer 5 is formed by surface electroplating The electroplating protective film has a thickness of 200 nm; the heat-sealing layer 6 is a composite film composed of polypropylene film and polyethylene film, and the thickness is 88 μm.

Embodiment 3

[0032]An aluminum-plastic composite film, whose interlayer structure includes: a reinforcement layer 1, an adhesive layer 2, a pitting layer 3, an insulating layer 4, a chemical-resistant film layer 5, and a heat-sealing layer 6. The reinforcement layer 2 is a polyethylene terephthalate film with a thickness of 25 μm; the adhesive layer is a polyurethane adhesive with a thickness of 2 μm; the pitting layer 3 is 500 nm in thickness, and is pitted on its surface. The structure is Dense hexagonal chemical micro-pitting holes with a depth of 400nm and a side length of 500nm; the insulating layer 4 is an alloy aluminum foil with a thickness of 40μm; the chemical-resistant film layer 5 is an electroplating protective film formed by surface electroplating with a thickness of 200nm; The sealing layer 6 is a polyethylene film with a thickness of 88 μm.

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Abstract

The invention provides an aluminum-plastic composite membrane for lithium battery shell encapsulation. The aluminum-plastic composite membrane comprises: a reinforcement layer, a bonding layer, a pitting layer, an isolation layer, a chemical-resistant film layer and a heat seal layer that are stacked in order, the pitting layer has a first surface, a second surface and a plurality of grooves, theisolation layer has a third surface and a fourth surface, the third surface is a matte surface, the fourth surface is a bright surface, the chemical-resistant film layer has a fifth surface and a sixth surface, the fifth surface is a smooth surface, the sixth surface is a rough surface, the first surface and the bonding layer are bonded, and the bonding layer is filled with the plurality of grooves, the second surface is attached to the third surface, the fourth surface is attached to the fifth surface, and the sixth surface is attached to the heat seal layer. The aluminum-plastic composite membrane for lithium battery shell encapsulation prepared according to the invention improves the inner layer overall isolation performance, improves the inner layer corrosion resistance, and improves the penetration resistance and folding resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of the lithium battery industry, and in particular relates to an aluminum-plastic composite film used for packaging lithium battery casings. Background technique [0002] With the rapid development of the small and integrated energy storage component market, the demand for multi-cell parallel connection and multi-battery intensive components has also increased, which has also aroused the market demand for soft-pack lithium batteries, especially for power energy storage soft-pack lithium batteries. need. The shell package of the power storage soft pack lithium battery is mainly aluminum-plastic composite film. Since the electrolyte used in lithium batteries contains lithium hexafluorophosphate, the compound is unstable and will decompose into a strong acid after being subjected to external heating, moisture intrusion, etc.; at the same time, the electrolyte contains a certain amount of strong soluble small m...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/0525B32B3/30B32B7/12B32B15/04B32B15/20B32B27/06B32B27/08B32B27/32B32B27/34B32B27/36B32B33/00H01M50/10
CPCH01M10/0525B32B3/30B32B7/12B32B15/04B32B15/20B32B27/06B32B27/08B32B27/32B32B27/34B32B27/36B32B33/00B32B2457/10B32B2307/31B32B2307/54H01M50/10Y02E60/10
Inventor 单化众吕松梁俊杰
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL