Soft package membrane for lithium battery

A flexible packaging film, lithium battery technology, applied in battery pack parts, battery box/jacket, battery box/cover material, etc. The effect of deep drawing performance and toughness improvement

Active Publication Date: 2015-04-01
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the organic polymer layer of the adhesive resin layer and the heat-sealing layer, the anti-corrosion treatment layer on the surface of the aluminum foil is relatively brittle, and the anti-corrosion treatment layer will produce defects such as pinholes and cracks during the drawing process, which affects the application of packaging films

Method used

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  • Soft package membrane for lithium battery
  • Soft package membrane for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Coat dry thick 3 micron polyurethane adhesive on 15 micron nylon film, composite 30 micron aluminum foil after degreasing treatment, treat with phosphoric acid on the other side of aluminum foil to obtain anticorrosion treatment layer, coat 2 micron on the anticorrosion treatment layer 1.8% Glycidyloxypropylcyclopentyl-POSS? and 0.2% 1,2-Propanediol-Isobutyl-POSS? (Sigma-Aldrich) acrylic resin layer, on the other side of the acrylic resin layer, extrude 40 micron acid-modified polyethylene resin and compound 20 micron heat-sealing layer film, obtains the flexible packaging film of lithium battery, measures its performance and sees Table 1.

Embodiment 2

[0038]Coat dry thick 4 micron polyurethane adhesive on 20 micron nylon film, composite 50 micron aluminum foil after degreasing treatment, treat anticorrosion treatment layer with polyphosphoric acid on the other side of aluminum foil, coat 5 micron containing on the anticorrosion treatment layer Acrylic resin layer of 5% Epoxypropyl-Cyclopentyl-POSS? and 1.5% TMP Diol-Cyclo-pentyl-POSS? (Hybrid Plastics Company) by weight, extruding 40 microns of metal ion cross-linked polyolefin resin on the other side of the acrylic layer, The lithium battery flexible packaging film was obtained, and its properties were measured in Table 1.

Embodiment 3

[0040] Coat dry thick 5 micron polyurethane adhesive on 30 micron nylon film, composite 40 micron aluminum foil after degreasing treatment, treat anticorrosion treatment layer with pyrophosphoric acid on the other side of aluminum foil, coat 4 micron containing on the anticorrosion treatment layer A phenolic resin layer with 7.2% Glycidoxypropyl-POSS? and 0.7% trans-Cyclohexanediol-Isobuty-POSS? (Sigma-Aldrich) by weight, extruding 20 microns of metal ion cross-linked polyolefin resin on the other side of the phenolic resin layer and compounding 40 Micron heat-sealing layer film, obtain lithium battery flexible packaging film, measure its performance and see Table 1.

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Abstract

The invention relates to a soft package membrane for a lithium battery. The soft package for the lithium battery membrane is sequentially provided with a nylon layer, a polyurethane adhesive layer, an aluminum foil layer, a preservative treatment layer, a bonding resin layer and a hot sealing layer. The soft package membrane is characterized in that a protective layer is further arranged between the preservative treatment layer and the bonding resin layer; the protective layer contains cage-like silsesquioxane which accounts for 2-8wt% of the total weight; the cage-like silsesquioxane consists of hydroxyl cage-like silsesquioxane and epoxy cage-like silsesquioxane in a weight ratio of 0.1: 1 to 0.3: 1. The soft package membrane for the lithium battery provided by the invention has good scour depth-resisting performance on the premise of satisfying the practical performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a soft packaging film for lithium batteries. Background technique [0002] Lithium batteries are lithium-ion secondary batteries. Due to their light weight, large capacity, long cycle life, and no memory effect, they are widely used in mobile phones, laptops, cameras, power banks, electric vehicles, robots, satellites, etc. It provides energy and is also used as a battery for energy storage, such as power bank, solar power station energy storage, etc. At present, lithium batteries are in a stage of continuous improvement in performance, continuous reduction in cost, rapid expansion of application fields, and a sharp increase in market share. [0003] Lithium battery flexible packaging film, as the outer shell of the battery core, needs to meet the following basic requirements: excellent heat sealability, inner material does not react with the electrolyte and the overal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M50/105
CPCH01M50/116H01M50/124Y02E60/10
Inventor 张学建胡亚召董云肖常建立
Owner 乐凯胶片股份有限公司
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