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High-safety lithium battery soft package aluminum plastic film

A high-safety, lithium-ion battery technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of easy cracks in the polypropylene layer of aluminum-plastic film, affecting battery safety, etc., to prevent contact and improve safety. properties, enhance the effect of chemical corrosion resistance

Active Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the problem that the polypropylene layer of the aluminum-plastic film in the prior art is prone to cracks and affect the safety of the battery, and provides a soft-packed aluminum-plastic film for a high-safety lithium battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of low-shrinkage polypropylene: the following raw materials in parts by weight: 70 parts of maleic anhydride graft-modified polypropylene with a graft ratio of 10%, 20 parts of barrier high-density polyethylene (HDPE), 1.5 parts of Parts of antioxidant tetrakis[beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester was mechanically mixed and then melt-blended by twin-screw extruder at 180°C to obtain low shrinkage Polypropylene.

[0025] (2) Preparation of modified polyurethane adhesive: (a) 8 parts by mass of diphenylmethane diisocyanate, 5 parts of trifluoroethyl methacrylate, and 90 parts of acetone were mixed at 70° C. under nitrogen atmosphere. Stir and react for 1.5 hours, then add 100 parts of palm oil polyol for 2 hours, and remove the solvent to obtain prepolymer A; (b) 20 parts by mass of ethylene glycol, 80 parts of diethylene glycol and Phenylmethane diisocyanate and 90 parts of acetone were mixed and stirred for 2 hour...

Embodiment 2

[0028](1) Preparation of low-shrinkage polypropylene: the following raw materials in parts by weight: 60 parts of maleic anhydride graft-modified polypropylene with a graft ratio of 20%, 15 parts of barrier ethylene-octene copolymer (POE ), 2 parts of antioxidant tris[2.4-di-tert-butylphenyl]phosphite were mechanically mixed, and then melt-blended by a twin-screw extruder at 160° C. to obtain low-shrinkage polypropylene.

[0029] (2) Preparation of modified polyurethane adhesive: (a) 10 parts by mass of dicyclohexylmethane diisocyanate, 6 parts of trifluoroethyl acrylate and 100 parts of toluene were mixed and reacted at 60° C. under nitrogen atmosphere. For 2 hours, 110 parts of palm oil polyol were added to react for 3 hours, and the solvent was removed to obtain prepolymer A; (b) 15 parts by mass of glycerol and 70 parts of dicyclohexylmethanediol were prepared in nitrogen atmosphere at 65°C. Isocyanate and 80 parts of toluene were mixed and reacted for 1 h, and the solvent...

Embodiment 3

[0032] (1) Preparation of low-shrinkage polypropylene: the following raw materials in parts by weight: 80 parts of acrylic acid graft modified polypropylene with a graft ratio of 8%, 15 parts of styrene-butadiene-styrene block copolymerization Compound (SBS), 1 part of antioxidant tetrakis[beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate]pentaerythritol ester were mechanically mixed and then melted by twin screw extruder at 170°C Blend to obtain low shrinkage polypropylene.

[0033] (2) Preparation of modified polyurethane adhesive: (a) 6 parts by mass of toluene-2,4-diisocyanate, 4 parts of hexafluorobutyl methacrylate, 80 parts by mass under nitrogen atmosphere at 80° C. Dimethylformamide was mixed and stirred for 1 hour, and then 90 parts of palm oil polyol was added for 1 hour, and the solvent was removed to obtain prepolymer A; (b) 25 parts by mass of neopentyl was prepared at 45°C under nitrogen atmosphere. Diol, 90 parts of toluene-2,4-diisocyanate and 100 parts of d...

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Abstract

The invention relates to the field of soft package lithium batteries, and discloses a high-safety lithium battery soft package aluminum-plastic film which comprises an outer barrier layer, an aluminum layer and a low-shrinkage polypropylene layer, and the outer barrier layer, the aluminum layer and the low-shrinkage polypropylene layer are bonded through a modified polyurethane adhesive; the low-shrinkage polypropylene layer comprises graft modified polypropylene, a barrier body and an antioxidant; and the modified polyurethane adhesive is a polyurethane adhesive added with fluorine-containing acrylate. Cracks of polypropylene in the heat-sealing and cooling process are reduced through the low-shrinkage polypropylene layer, and contact between electrolyte and the aluminum layer is reduced; the barrier is added into the low-shrinkage polypropylene layer, so that the chemical corrosion resistance of the polypropylene layer is enhanced, and the safety of the aluminum-plastic film is improved; and the modified polyurethane adhesive is adopted, so that the barrier property of the adhesive is enhanced while the bonding capacity between the aluminum layer and the polypropylene layer is enhanced, and the electrolyte is prevented from being in contact with the aluminum layer.

Description

technical field [0001] The invention relates to the field of soft-packed lithium batteries, in particular to a soft-packed aluminum-plastic film for high-safety lithium batteries. Background technique [0002] There are mainly two types of hard packs and soft packs in the processing of lithium-ion battery shells. The shell materials of hard pack lithium batteries are generally metals such as aluminum shells and steel shells, and the shell materials of soft pack lithium batteries are generally aluminum-plastic films. Compared with hard-pack Li-ion batteries, soft-pack Li-ion batteries can achieve flexible design, high energy density, good safety performance, and have better development potential. [0003] During the packaging process of the soft-pack lithium-ion battery, the PP (polypropylene) layers of the two layers of aluminum-plastic film are melted and combined together by high temperature hot pressing to complete the packaging, so as to achieve the function of sealing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/126H01M50/129
CPCH01M50/129H01M50/126Y02P70/50Y02E60/10
Inventor 颜立清王军华曹杰郑利峰
Owner WANXIANG 123 CO LTD