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High-barrier-property packaging film for lithium battery

A high-barrier, lithium-ion battery technology, used in battery pack parts, battery boxes/jackets, battery box/cover materials, etc., can solve the problems of peeling and delamination, the adhesive layer is easily corroded, and the aluminum foil layer cracks.

Pending Publication Date: 2020-07-07
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Although the existing flexible packaging film for lithium batteries has the advantages of light weight, high safety, and simple preparation and packaging processes, it still has the phenomenon of peeling and delamination between the layers of the packaging film after long-term use. During the process, the aluminum foil layer is easily subjected to force to form cracks, and the barrier effect on water vapor and acid liquid needs to be improved. The bonding layer between the layers is easily corroded, which affects the service life of the packaging film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A packaging film for a high-barrier lithium battery, comprising a nylon layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, a reinforcement layer, a third adhesive layer and a heat-sealing layer, which are sequentially stacked. The outer surface of the layer is surface-coated with SiO X Coated BOPP film layer, the thickness of the nylon layer is 20 μm, SiO X Coating thickness is 200nm, the SiO X The coating adopts the electron gun evaporation coating method, and the BOPP film layer and the nylon layer are connected by an adhesive. There is an embossed layer on the contact surface between the BOPP film layer and the nylon layer, and the embossed layer adopts a concentric circle. The first adhesive layer is a gelatin layer, the second adhesive layer and the third adhesive layer adopt EAA, the contact surface of the aluminum foil layer and the first adhesive layer is coated with a layer of corrosion-resistant layer, the aluminum foil layer The...

Embodiment 2

[0030] A packaging film for a high-barrier lithium battery, comprising a nylon layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, a reinforcement layer, a third adhesive layer and a heat-sealing layer, which are sequentially stacked. The outer surface of the layer is surface-coated with SiO X Coated BOPP film layer, the thickness of the nylon layer is 22 μm, SiO X Coating thickness is 220nm, the SiO X The coating adopts the electron gun evaporation coating method, and the BOPP film layer and the nylon layer are connected by an adhesive. There is an embossed layer on the contact surface between the BOPP film layer and the nylon layer, and the embossed layer adopts a concentric circle. The first adhesive layer is a gelatin layer, the second adhesive layer and the third adhesive layer adopt EAA, the contact surface of the aluminum foil layer and the first adhesive layer is coated with a layer of corrosion-resistant layer, the aluminum foil layer The...

Embodiment 3

[0032] A packaging film for a high-barrier lithium battery, comprising a nylon layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, a reinforcement layer, a third adhesive layer and a heat-sealing layer, which are sequentially stacked. The outer surface of the layer is surface-coated with SiO X Coated BOPP film layer, the thickness of the nylon layer is 25 μm, SiO X Coating thickness is 250nm, the SiO X The coating adopts the electron gun evaporation coating method, and the BOPP film layer and the nylon layer are connected by an adhesive. There is an embossed layer on the contact surface between the BOPP film layer and the nylon layer, and the embossed layer adopts a diamond shape. The first The adhesive layer is a gelatin layer, the second adhesive layer and the third adhesive layer adopt EMAA, the contact surface of the aluminum foil layer and the first adhesive layer is coated with a layer of corrosion-resistant layer, and the thickness of the al...

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Abstract

The invention relates to the technical field of battery packaging films, in particular to a high-barrier-property packaging film for lithium batteries, which comprises a nylon layer, a first bonding layer, an aluminum foil layer, a second bonding layer, a reinforcing layer, a third bonding layer and a heat sealing layer sequentially arranged in a stacked mode. Wherein a BOPP film layer of which the surface is coated with a SiOX coating is arranged on the outer surface of the nylon layer; wherein the first bonding layer is a gelatin layer, the second bonding layer and the third bonding layer adopt EAA or EMAA, the contact surface of the aluminum foil layer and the first bonding layer is coated with a corrosion-resistant layer, and the heat sealing layer adopts polyurethane modified epoxy resin. According to the invention, the BOPP film layer coated with the SiOX coating is arranged on the outer surface of the nylon layer; the gelatin is used as the first bonding layer, the external oxygen resistance of the packaging film can be further improved, the water resistance of the nylon layer can be further improved through the BOPP film, and therefore the packaging film for the lithium battery has the high barrier property and is long in service life.

Description

technical field [0001] The invention relates to the technical field of battery packaging films, in particular to a packaging film for lithium batteries with high barrier properties. Background technique [0002] Although the existing flexible packaging film for lithium batteries has the advantages of light weight, high safety, and simple preparation and packaging processes, it still has the phenomenon of peeling and delamination between the layers of the packaging film after long-term use. During the process, the aluminum foil layer is easy to be stressed to form cracks, and the barrier effect on water vapor and acid liquid needs to be improved. The bonding layer between the layers is easily corroded, which affects the service life of the packaging film. Contents of the invention [0003] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a high-barrier lithium battery packaging film with high barrier property and long servic...

Claims

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Application Information

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IPC IPC(8): B32B27/34B32B33/00B32B27/32B32B7/12B32B15/20B32B15/088B32B27/06B32B15/14B32B9/00B32B9/04B32B27/38B32B27/12H01M2/02
CPCB32B27/34B32B33/00B32B27/32B32B7/12B32B15/20B32B15/088B32B27/06B32B15/14B32B5/02B32B27/38B32B27/12B32B2255/10B32B2255/20B32B2262/106H01M50/116H01M50/124Y02E60/10
Inventor 吕松
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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