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Aluminum-plastic composite film for lithium ion battery having double heat conducting layers

A lithium-ion battery, aluminum-plastic composite film technology, used in secondary batteries, battery pack parts, lamination, etc., can solve the problems of material stability decline, explosion, etc., and achieve the effect of high flexibility

Inactive Publication Date: 2018-11-30
肇庆高新区飞越信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aiming at the problems in the prior art that lithium batteries packaged in metal shells are easy to release gas during use and cause explosions due to increased pressure, a new type of soft packaging material, namely aluminum-plastic film, has been introduced on the market. This packaging material can expand to release pressure , so as to prevent the occurrence of explosion accidents
[0003] Since the polymer lithium-ion battery will release heat during use, the stability of the material will decrease. Therefore, it is urgent to solve the problem of improving the thermal conductivity of the material on the premise of ensuring the basic packaging performance.

Method used

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  • Aluminum-plastic composite film for lithium ion battery having double heat conducting layers

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preparation example Construction

[0032] Among the present invention, the preparation method of the above-mentioned aluminum-plastic composite film with double heat-conducting layer comprises the following steps:

[0033] (1) Perform pretreatment on both sides of the aluminum foil, then evenly coat a layer of low-temperature hot-melt adhesive on one side of the aluminum foil, then let it stand for 1 to 3 minutes, and then cover the nylon scratch-resistant layer on the low-temperature hot-melt adhesive. Cold pressed together at room temperature;

[0034] (2) Add powdered mineral fiber, graphene oxide and alumina powder to the solvent, add thermosetting resin glue and thermosetting resin curing agent during stirring, and ultrasonically disperse the mixture; coat the other side of the aluminum foil And form a hard heat-conducting layer. After the coating is completed, it is dried through a hot drying tunnel with a temperature of 60-80°C. During the drying tunnel, the aluminum foil is in a tight state;

[0035] (...

Embodiment 1

[0040]An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0041] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 35 parts of sepiolite fiber, 5 parts of graphene oxide, 4 parts of alumina powder, 28 parts of epoxy resin glue, and 5 parts of epoxy resin curing agent , 72 parts of ethyl acetate;

[0042] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 55 parts of flexible unsaturated polyester resin, 2 parts of aliphatic blocked polyisocyanate curing agent, and 80 parts of ethyl acetate;

[0043] The nylon scratch-resistant layer ...

Embodiment 2

[0051] An aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers, comprising a nylon scratch-resistant layer, an aluminum foil layer, a hard heat-conducting layer and a flexible heat-conducting layer arranged sequentially from the outside to the inside, the nylon scratch-resistant layer and the aluminum foil Layers are bonded together by low-temperature hot-melt adhesive;

[0052] The hard heat conducting layer is prepared from the following raw materials in parts by weight: 30 parts of sepiolite fiber, 4 parts of graphene oxide, 4 parts of alumina powder, 24 parts of epoxy resin glue, and 4 parts of epoxy resin curing agent , 66 parts of ethyl acetate;

[0053] The flexible heat-conducting layer is prepared from the following raw materials in parts by weight: 48 parts of flexible unsaturated polyester resin, 1 part of aliphatic blocked polyisocyanate curing agent, and 75 parts of ethyl acetate;

[0054] The nylon scratch-resistant layer ...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to an aluminum-plastic composite film for a lithium ion battery having double heat conducting layers. Thealuminum-plastic composite film orderly comprises a nylon scratch-resistant layer, an aluminum foil layer, a hard heat conductive layer and a flexible heat conductive layer from outside to inside. The nylon scratch-resistant layer and the aluminum foil layer are compounded through a low-temperature hot-melt adhesive. The hard heat conductive layer comprises powdery mineral fibers, graphene oxide,alumina powder, heat-curing resin glue, a heat curing resin curing agent and a solvent. The flexible heat conductive layer comprises a flexible unsaturated polyester resin, a curing agent and a solvent. The hard heat conductive layer and the flexible heat conductive layer are orderly arranged in the inner side of the aluminum foil layer. The hard heat conductive layer has high hardness, can effectively resist the thorns of a copper mesh and an aluminum mesh, and can prevent the damage of the aluminum foil layer. The flexible heat conductive layer has high flexibility and adapts to the deformation requirements of the aluminum-plastic composite film during vacuuming.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an aluminum-plastic composite film for lithium-ion batteries with double heat-conducting layers. Background technique [0002] Aiming at the problems in the prior art that lithium batteries packaged in metal shells are easy to release gas during use and cause explosions due to increased pressure, a new type of soft packaging material, namely aluminum-plastic film, has been introduced on the market. This packaging material can expand to release pressure , so as to prevent the occurrence of explosion accidents. [0003] Since the polymer lithium-ion battery will release heat during use, the stability of the material will decrease. Therefore, it is urgent to solve the problem of improving the thermal conductivity of the material on the premise of ensuring the basic packaging performance. Contents of the invention [0004] The object of the present invent...

Claims

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Application Information

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IPC IPC(8): B32B27/34B32B15/088B32B15/20B32B33/00B32B37/12B32B38/00B32B38/16H01M2/02H01M10/0525H01M10/613
CPCB32B15/088B32B15/20B32B27/34B32B33/00B32B37/1284B32B38/00B32B38/164B32B2255/06B32B2255/26B32B2307/304B32B2307/50B32B2307/558H01M10/0525H01M10/613H01M50/124Y02E60/10
Inventor 曾诗敏
Owner 肇庆高新区飞越信息科技有限公司