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High-peel-strength flexible packaging film for lithium battery

A technology of high peel strength, flexible packaging film, applied in secondary batteries, battery pack parts, battery boxes/jackets, etc. Transmittance, increased strength, high strength and elongation effects

Pending Publication Date: 2020-06-05
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The heat-sealing layer of the existing flexible packaging film is generally made of thermoplastic resin material, and the peel strength and stretch resistance of the existing heat-sealing layer need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A flexible packaging film for lithium batteries with high peel strength, comprising a protective layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer and a heat-sealing layer that are sequentially stacked, and the heat-sealing layer is sequentially from top to bottom EVA adhesive film layer, POE film layer, polyurethane modified epoxy resin layer, the above-mentioned layers are formed by fusion bonding of adhesive resin, the protective layer is a nylon layer filled with short glass fibers, and the thickness of the protective layer is 20 μm, the addition of short glass fibers in the protective layer is 2% of the nylon mass, the thickness of the heat-sealing layer is 60 μm, the contact surface between the heat-sealing layer and the second adhesive layer and the EVA film layer, so The upper surface and the lower surface of the POE film layer are respectively provided with embossing, the embossing is concentric, and the height of the embossing is 60...

Embodiment 2

[0032] A flexible packaging film for lithium batteries with high peel strength, comprising a protective layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer and a heat-sealing layer that are sequentially stacked, and the heat-sealing layer is sequentially from top to bottom EVA adhesive film layer, POE film layer, polyurethane modified epoxy resin layer, the above-mentioned layers are formed by fusion bonding of adhesive resin, the protective layer is a nylon layer filled with short glass fibers, and the thickness of the protective layer is 25 μm, the addition of short glass fibers in the protective layer is 2% of the nylon mass, the thickness of the heat-sealing layer is 65 μm, the contact surface between the heat-sealing layer and the second adhesive layer and the EVA film layer, so The upper surface and the lower surface of the POE film layer are respectively provided with embossing, the embossing is concentric, and the height of the embossing is 65...

Embodiment 3

[0034] A flexible packaging film for lithium batteries with high peel strength, comprising a protective layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer and a heat-sealing layer that are stacked in sequence, and the heat-sealing layer is sequentially from top to bottom EVA adhesive film layer, POE film layer, polyurethane modified epoxy resin layer, the above-mentioned layers are melted and bonded by adhesive resin, the protective layer is a nylon layer filled with short glass fibers, and the thickness of the protective layer is 30 μm, the addition of short glass fibers in the protective layer is 3.5% of the nylon mass, the thickness of the heat-sealing layer is 70 μm, the contact surface between the heat-sealing layer and the second adhesive layer and the EVA film layer, so The upper surface and the lower surface of the POE film layer are respectively provided with embossing, the embossing is diamond-shaped, and the height of the embossing is 700-...

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Abstract

The invention relates to the technical field of battery packaging films, and in particular relates to a high-peel-strength flexible packaging film for a lithium battery. The high-peel-strength flexible packaging film comprises a protective layer, a first bonding layer, an aluminum foil layer, a second bonding layer and a heat sealing layer which are sequentially stacked. The heat sealing layer sequentially comprises an EVA adhesive film layer, a POE film layer and a polyurethane modified epoxy resin layer from top to bottom and all layers are fused and bonded through bonding resin to form theheat sealing layer. The thickness of the heat sealing layer is 60 to 80 microns. Embossments are arranged on the contact surface of the heat sealing layer and the second bonding layer, the EVA adhesive film layer and the upper surface and the lower surface of the POE film layer respectively, and the EVA adhesive film layer is further filled with carbon fibers. The POE film has high strength and elongation, good weather resistance and ultraviolet aging resistance, excellent heat resistance and low temperature resistance, low water vapor transmission rate and large cohesion. When the material ofthe layer is used in cooperation, advantages can be made up for disadvantages. . The overall performance of the heat sealing layer is improved, and therefore the peeling strength of the flexible packaging film is improved.

Description

technical field [0001] The invention relates to the technical field of battery packaging films, in particular to a flexible packaging film for lithium batteries with high peel strength. Background technique [0002] The flexible packaging film for batteries is generally aluminum-plastic film, usually with three layers. The nylon layer ensures the shape of the aluminum-plastic film, reduces damage to the casing, and ensures that the film will not deform before it is manufactured into a lithium-ion battery, preventing air, especially Oxygen penetration, maintain the environment inside the cell, and at the same time ensure that the packaging aluminum foil has good deformation ability. The Al layer is composed of a layer of metal Al. Its function is to prevent the infiltration of water, maintain the environment inside the cell with a certain thickness and strength, and prevent external damage to the cell. Lithium-ion batteries are very afraid of water. Generally, the water cont...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/0525B32B9/00B32B9/04B32B27/08B32B27/12B32B27/28B32B27/32B32B27/38B32B7/12
CPCH01M10/0525B32B5/02B32B27/08B32B27/12B32B27/285B32B27/32B32B27/38B32B7/12B32B2262/106H01M50/116H01M50/131H01M50/124Y02E60/10
Inventor 吕松
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL