Flexible package material of lithium ion battery

A lithium-ion battery and flexible packaging technology, which is applied in the direction of battery box/case materials, secondary batteries, battery pack parts, etc., can solve problems such as unexplained bond strength, exhaust performance, and reduced electrolyte resistance, so as to avoid The effect of cracking and high heat seal strength

Active Publication Date: 2016-08-24
SUZHOU FIRST PV MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not explain how to solve the problem of how to solve the problem that while the sealing layer and the metal layer have high bonding strength, the sealing layer has excellent resistance to bending and whitening and has the ability to remove the gas generated inside the lithium battery without reducing its heat. Seal strength, or maintain good gas-gas performance without reducing its electrolyte resistance

Method used

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  • Flexible package material of lithium ion battery
  • Flexible package material of lithium ion battery
  • Flexible package material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～15 and comparative example 1～4

[0047] The two-component liquid polyurethane adhesive is coated on the aluminum foil layer 13 with a thickness of 40 μm by the gravure roller coating method to form an adhesive layer 12 with a thickness of 5 μm, which is dried with hot air at 80°C and bonded under pressure A biaxially stretched nylon film with a thickness of 25 μm is used to form a heat-resistant resin layer 11. After curing at 60°C for 24 hours, a laminate 1 of heat-resistant resin layer 11 / adhesive layer 12 / aluminum foil layer 13 is formed. Among them, the aluminum foil layer 13 is degreased in advance, and the chemically synthesized film is formed by chromate treatment on the side of the bonding resin layer 2, and the chromium content on the surface is 25 mg / m 2 .

[0048] The maleic anhydride-modified polypropylene resin and the propylene-based polyolefin elastomer constituting the bonding resin layer 2 were simply blended in a high-speed mixer according to the formula shown in Table 1, and the blend const...

Embodiment 16～30 and comparative example 5～7

[0066] The two-component liquid polyurethane adhesive is coated on the aluminum foil layer 13 with a thickness of 40 μm by the gravure roller coating method to form an adhesive layer 12 with a thickness of 5 μm, which is dried with hot air at 80°C and bonded under pressure A biaxially stretched nylon film with a thickness of 25 μm is used to form a heat-resistant resin layer 11. After curing at 60°C for 24 hours, a laminate 1 of heat-resistant resin layer 11 / adhesive layer 12 / aluminum foil layer 13 is formed. Among them, the aluminum foil layer 13 is degreased in advance, and the chemically synthesized film is formed by chromate treatment on the side of the bonding resin layer 2, and the chromium content on the surface is 25 mg / m 2 .

[0067] The sealing layer 32a, which constitutes the sealing layer 32, has a high-Tm low-MFR polypropylene resin, the sealing layer 32b has a low-Tm high-MFR polypropylene resin, and the propylene-based polyolefin elastomer 32c is simply blended ...

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Abstract

The invention relates to a flexible package material of a lithium ion battery. The flexible package material comprises a lamination body, a binding resin layer and sealing layers which are sequentially laminated, wherein the lamination body comprises a heat-resistant resin layer, a binding agent layer and an aluminum foil layer which are sequentially laminated, the melting point of the heat-resistant resin layer is higher than the melting points of the sealing layers made of polyolefin rein, the binding resin layer is polyurethane binding resin, acid-modified polyolefin resin, epoxy binding rein, styrene elastomer binding resin or ethylene acrylic acid binding resin and is laminated on the surface of the aluminum foil layer through hot pressing, and the melt flow rate of a first sealing layer is smaller than the melt flow rates of a second sealing layer and the binding resin layer. The binding resin layer is selected and is used for providing relatively high binding strength between the sealing layer and the aluminum foil layer, and the first sealing layer and the second sealing layer are made of materials with different melt flow rates, and thus, the lithium ion battery can be prevented from being broken due to internal voltage rise; and moreover, the flexible package material has relatively high heat sealing strength, and the resistant stress is bent and whitened.

Description

technical field [0001] The invention belongs to the field of lithium battery packaging materials, and relates to a soft packaging material, in particular to a lithium ion battery flexible packaging material. Background technique [0002] In recent years, with the rapid development of portable electronic mobile communication and entertainment equipment, driven by the industry of new energy electric vehicles and hybrid vehicles, the global emerging functional drone market has sprung up, bringing new opportunities to the flexible packaging materials industry for lithium-ion batteries. However, the lithium-ion battery also has the functional characteristics of miniaturization, thinness and lightness, and at the same time has certain practicability and safety. [0003] Japan's Showa Denko and Dainippon Printing Co., Ltd. have prepared a new generation of flexible packaging materials for lithium-ion batteries by dry lamination and thermal lamination respectively to meet their func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/0525B32B15/20B32B15/08B32B15/085B32B7/10B32B33/00H01M50/116H01M50/124H01M50/131
CPCB32B7/10B32B15/08B32B15/085B32B15/20B32B33/00B32B2307/546H01M50/116H01M50/131H01M50/124Y02E60/10
Inventor 林建华余小玉宋阳
Owner SUZHOU FIRST PV MATERIAL CO LTD
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