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Lithium cell packaging film and polyurethane adhesive therefor

A technology of polyurethane adhesive and packaging film, applied in the direction of polyurea/polyurethane adhesive, adhesive type, packaging, etc., can solve the problems of low cohesive force, complex production process, high production cost, and improve the use of The effect of long life, simple production process and low production cost

Inactive Publication Date: 2013-02-27
吕方龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lianyungang Zhongjin Pharmaceutical Packaging Co., Ltd. applied for a Chinese invention patent on October 24, 2001. The application number is 01263383.6, and the patent name is "Lithium Battery Flexible Packaging Film". It discloses a manufacturing method for lithium battery flexible packaging film. One side of the electrolyte is directly compounded with a heat-sealing layer without using an adhesive, resulting in low peel strength and low adhesion between the aluminum foil heat-sealing layer and aluminum foil, and the need for expensive extrusion production equipment
Dainippon Printing Co., Ltd. applied for an invention patent in China on December 18, 2000. The application number is: 00806337.0, and the patent name is "Packaging materials for polymer batteries and its manufacturing method". It discloses a flexible packaging film for lithium batteries. It is composed of base layer / adhesive resin layer / chemical treatment layer / aluminum foil layer / chemical treatment layer / adhesive resin layer / heat seal layer. Since the number of layers is as many as seven, the production process is complicated and the production cost is high.
Moreover, the peel strength of the heat-sealing layer and aluminum foil of the patented product is not high enough. For example, the initial peel strength of the aluminum-plastic film for lithium batteries printed by Dainippon is 30N / 15mm, and the peel strength after soaking in the electrolyte for 12 days is 9N / 15mm
Because of the low peel strength under working conditions, it affects the service life of the final product

Method used

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  • Lithium cell packaging film and polyurethane adhesive therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the polyether polyol (230, Zibo Boshan Shu Culture Industry Co., Ltd.) and 1 mass part average molecular weight are 500 chlorinated polyethylene (Linyi Shengtai Chemical Co., Ltd.) heated to 280 degrees, at this time, acidic gas was formed, tested with wet PH test paper, found that the test paper turned red, continued to heat slowly until no acid gas was generated, at this time the system temperature was about 320 degrees, after cooling A modified polyether polyol was obtained, and the polyether polyol was mixed with isocyanate (N3390, Bayer) in equal amounts to obtain a modified polyurethane adhesive.

[0021] The structure of the lithium battery packaging film example is shown in Figure 1, consisting of a base layer 1, an adhesive layer 2, an aluminum foil layer 3, a modified adhesive layer 4, and a heat-sealing layer 5 layers. The base layer 1 is a nylon film with a thickness of 25-25 microns, the aluminum foil layer 3 is a soft aluminum foil with a thi...

Embodiment 2

[0023] Embodiment 2: 3 parts by mass of polyether polyol (340, Zibo Boshan Shu Culture Industry Co., Ltd.) and 1 part by mass of molecular weight 600 polyether polyol (Wuhan Yuancheng Science and Technology Co., Ltd. Development Co., Ltd.) is heated to 290 degrees. At this time, acidic gas is generated. Test with wet PH test paper and find that the test paper turns red. Continue to heat slowly until no acid gas is generated. At this time, the system temperature is about 350 degrees. After cooling, it is obtained To modify the polyether polyol, mix the polyether polyol and isocyanate (N75, Bayer) in equal amounts to obtain a modified polyurethane adhesive.

[0024] The structure of the lithium battery packaging film example is shown in Figure 1, consisting of a base layer 1, an adhesive layer 2, an aluminum foil layer 3, a modified adhesive layer 4, and a heat-sealing layer 5 layers. The base layer 1 is made of nylon with a thickness of 35 microns, the aluminum foil layer 3 is ...

Embodiment 3

[0026] Embodiment 3: the polyether polyol (455, Guangzhou UBS Co., Ltd.) and the chlorinated polybutadiene (Sichuan Changshou Chemical Plant) of 1000 that the 4 functional average molecular weight of 3 mass parts are 5500 and 1 mass part ) is heated to 320 degrees, at this time there are other acidic substances, tested with wet PH test paper, it is found that the test paper turns red, continue to heat slowly until no acid gas is generated, at this time the temperature of the system is about 380 degrees, and the modified polymer is obtained after cooling. Ether polyol, the polyether polyol and isocyanate (L75, Bayer) are mixed in equal amounts to obtain a modified polyurethane adhesive.

[0027] The structure of the lithium battery packaging film example is shown in Figure 1, consisting of a base layer 1, an adhesive layer 2, an aluminum foil layer 3, a modified adhesive layer 4, and a heat-sealing layer 5 layers. The base layer 1 is made of polyamide with a thickness of 12.5 m...

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Abstract

The invention discloses a lithium cell packaging film and a polyurethane adhesive therefor. The polyurethane adhesive for the lithium cell packaging film is formed by mixing a proper quantity of modified polyether glycol, isocyanate, and the like, wherein the modified polyether glycol is formed by grafting and copolymerizing polyether glycol and graft copolymer through non-polar groups. The lithium cell packaging film comprises a surface layer and a hot seal layer, wherein the surface layer comprises an aluminum foil layer, and the hot seal layer is compounded with the aluminum foil layer; anadhesive layer is arranged between the aluminum foil layer and the hot seal layer; one side of the aluminum foil layer is compounded with the hot seal layer through the adhesive layer through a dry compound machine; and the adhesive is the polyurethane adhesive for the lithium cell packaging film. The polyurethane adhesive for the lithium cell packaging film has good adhesive force under a working condition, and the aluminum foil hot seal layer has high peeling strength with the aluminum foil; the lithium cell packaging film has the advantages of fewer structure layers, simple production process and lower production cost; and the hot seal layer has high peeling strength with the aluminum foil, which can effectively prolong the service life of the lithium cell.

Description

[technical field] [0001] The invention relates to the technical field of polymer materials, in particular to a polyurethane adhesive for a lithium battery packaging film and the lithium battery packaging film. [Background technique] [0002] Due to its high working voltage, small size, light weight, high energy, no memory effect, no pollution, small self-discharge, and long cycle life, lithium-ion batteries are ideal energy sources for development in the 21st century. Traditionally, people also refer to lithium-ion batteries as lithium batteries, and the lithium batteries mentioned in this application are lithium-ion batteries. [0003] Lianyungang Zhongjin Pharmaceutical Packaging Co., Ltd. applied for a Chinese invention patent on October 24, 2001. The application number is 01263383.6, and the patent name is "Lithium Battery Flexible Packaging Film". It discloses a manufacturing method for lithium battery flexible packaging film. One side of the electrolyte is directly co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08H01M2/02B32B15/08B65D65/40H01M50/121H01M50/126H01M50/129
CPCY02E60/12Y02E60/10
Inventor 吕方龙杨颜平
Owner 吕方龙