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Insulating heat conduction coating, preparation method and application of insulating heat conduction coating to battery shell

A technology of insulation and heat conduction and battery casing, which is applied to the preparation of the above-mentioned insulation and heat-conduction coating, the application of the above-mentioned insulation and heat-conduction coating in the battery casing, and the field of insulation and heat-conduction coatings can solve the problem of increased cost of lithium-ion batteries, cumbersome assembly procedures, and material problems. High cost and other problems, to achieve the effect of reducing thermal runaway, convenient and simple spraying, and low material cost

Active Publication Date: 2012-05-02
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above patents have the advantages of high specific energy and the battery case is not charged so that the performance of the lithium-ion battery is stable. However, the above-mentioned method adopts the combination of the steel case case and the insulating gasket to avoid thermal runaway and sealing failure of the battery, and the material cost is high. , The assembly process is cumbersome, resulting in a significant increase in the cost of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Preparation of insulating and thermally conductive coating

[0035] Insulating and thermally conductive coatings include the following components by weight:

[0036] 110 parts of ethane;

[0037] Polypropylene plastic (PP) 100 parts;

[0038] 30 parts of silicon carbide powder;

[0039] The silicon carbide (SiC) powder has a particle size of 5 μm.

[0040] During preparation, add 110 parts of ethane solvent into the mixer and heat it to 85°C; then add 100 parts of polypropylene plastic, and then stir the mixer at a speed of 3500-6000r / min for 5 hours until the polypropylene plastic is The solvent is completely dissolved; then silicon carbide (SiC) powder with a particle size of 5 microns is added, and stirring is continued for 8 hours to obtain an insulating and thermally conductive coating.

[0041] Use spraying equipment to spray the coating prepared above to the inner cavity of the battery case of the lithium battery, and place the case in a blast o...

Embodiment 2

[0043] Embodiment 2: Preparation of insulating and heat-conducting coating

[0044] Insulating and thermally conductive coatings include the following components by weight:

[0045] 150 parts of chloroform;

[0046] Polyethylene plastic (PE) 120 parts;

[0047] 40 parts of alumina powder;

[0048] The particle size of the alumina powder is 4 μm.

[0049] When preparing, add 140 parts of chloroform solvent into the mixer and heat it to 110°C; then add 120 parts of polyethylene plastic, and then stir the mixer at a speed of 3500-6000r / min for 3 hours until the polyethylene plastic It is completely dissolved by the solvent; then add alumina powder with a particle size of 4 microns, and continue stirring for 6 hours to obtain an insulating and thermally conductive coating.

[0050] Use the spraying equipment to spray the paint prepared above to the inner cavity of the battery case of the lithium battery, and place the case in a blast oven or a drying tunnel. The internal tempe...

Embodiment 3

[0052] Embodiment 3: Preparation of insulating and heat-conducting coating

[0053] Insulating and thermally conductive coatings include the following components by weight:

[0054] 180 parts of chloroform and trichlorobenzene;

[0055] 150 parts of polyethylene plastic and polyphenylene sulfide plastic;

[0056] 50 parts of magnesium oxide powder and silicon carbide powder;

[0057] Among them, the particle size of the magnesium oxide powder is 8 μm, and the particle size of the silicon carbide powder is 5 μm. The ratio between chloroform and trichlorobenzene is not limited, the ratio between polyethylene plastic and polyphenylene sulfide plastic is not limited, and the ratio between magnesium oxide powder and silicon carbide powder is not limited.

[0058]During preparation, add 180 parts of a mixed solvent of chloroform and trichlorobenzene into the mixer and heat it to 130°C; then add 150 parts of polyethylene plastic and polyphenylene sulfide plastic, and then the mixe...

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Abstract

The invention relates to an insulating heat conduction coating, which comprises the following components in part by weight: 110 to 180 parts of organic solvent, 100 to 150 parts of plastic substrate and 30 to 50 parts of inorganic filler, wherein the organic solvent is one or a mixture of more than two of tetralin, trichlorobenzene, dimethylbenzene, cyclohexanone, acetate, ethane, benzene and trichloromethane; the plastic substrate is one or a mixture of more than two of polypropylene plastics, polyethylene plastics and polyphenylene sulfide plastics; and the inorganic filler is one or a mixture of more than two of magnesium oxide powder, aluminum oxide powder and silicon carbide powder. A preparation method for the insulating heat conduction coating comprises the following steps of: performing hot melting, stirring and mixing. The insulating heat conduction coating serving as a main layer is coated in an inner cavity of a metal shell of a lithium ion battery, so that the heat dissipated by the battery in the using process can be led out quickly; and the integral shell is insulated from the battery to prevent electrolyte in the long-term using process from corroding the metal shell, so the thermorunaway and sealing failure of the lithium ion battery can be reduced effectively.

Description

technical field [0001] The invention relates to a new coating, in particular to an insulating and heat-conducting coating. [0002] The present invention also relates to a preparation method of the above-mentioned insulating and heat-conducting paint. [0003] The present invention also relates to the application of the above-mentioned insulating and heat-conducting paint in the battery case. Background technique [0004] Power batteries with lithium manganese oxide, lithium iron phosphate, etc. as positive electrode materials are collectively classified as lithium-ion power batteries. Large-capacity lithium-ion batteries have been used in electric vehicles and have become one of the main power sources for electric vehicles. As the international energy shortage is becoming more and more serious, electric vehicle technology is expected to be high, and the safety of the lithium-ion power battery as the power battery of electric vehicles has become the key to whether the power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D123/12C09D123/06C09D181/02C09D5/25H01M10/50H01M10/613H01M10/625H01M10/6551
CPCY02E60/12Y02E60/10
Inventor 翟冬
Owner 奇瑞新能源汽车股份有限公司
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