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A kind of insulating and thermally conductive paint, preparation method, and application in battery case

A technology for insulating and conducting heat and battery casings, which is applied to the preparation of the above-mentioned insulating and heat-conducting coatings, the insulating and heat-conducting coatings, and the application field of the above-mentioned insulating and heat-conducting coatings in battery casings, which can solve the problem of increasing the cost of lithium-ion batteries, cumbersome assembly procedures, and materials High cost and other problems, to achieve the effect of reducing thermal runaway, convenient and simple spraying, and low material cost

Active Publication Date: 2016-12-14
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 mix...

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Abstract

An insulating and heat-conducting coating comprises, by weight components: 110-180 parts of an organic solvent, 100-150 parts of a plastic substrate, and 30-50 parts of an inorganic filler. The organic solvent is one or a mixture of two or more of tetralin, trichlorobenzene, xylene, cyclohexanone, acetate, ethane, benzene and chloroform; the plastic substrate is polypropylene plastic, One or a mixture of two or more of polyethylene plastic and polyphenylene sulfide plastic; the inorganic filler is one or a mixture of two or more of magnesium oxide powder, aluminum oxide powder and silicon carbide powder. The insulating and heat-conducting paint adopts the preparation method of hot melting, stirring and mixing. By coating the main layer of the insulating and heat-conducting paint on the inner cavity of the metal shell of the lithium-ion battery, the heat emitted by the battery during use can be quickly dissipated, and the entire shell is insulated from the battery, thereby avoiding electrolysis during long-term use The corrosion of the metal shell by the liquid can effectively reduce the thermal runaway and seal failure of the lithium-ion battery.

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 Patents(China)
IPC IPC(8): C09D123/12C09D123/06C09D181/02C09D5/25H01M10/653
Inventor 翟冬
Owner 奇瑞新能源汽车股份有限公司
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