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Ethylene-propylene-diene monomer rubber for thermal protection of lithium ion battery and preparation method of ethylene-propylene-diene monomer rubber

A technology of EPDM rubber and lithium ion battery, applied in the field of functional materials, can solve problems such as reducing elasticity, and achieve the effects of reducing the probability of burning and explosion, improving burning smell and reducing pollution

Active Publication Date: 2018-12-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the propylene unit content is low, the tertiary carbon atoms in the macromolecular chain will be less, which is beneficial to the aging resistance of the rubber. However, if it is less than 27%, too many ethylene units may form block self-polymerization. Such blocks have crystallization ability and will reduce elasticity

Method used

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  • Ethylene-propylene-diene monomer rubber for thermal protection of lithium ion battery and preparation method of ethylene-propylene-diene monomer rubber
  • Ethylene-propylene-diene monomer rubber for thermal protection of lithium ion battery and preparation method of ethylene-propylene-diene monomer rubber
  • Ethylene-propylene-diene monomer rubber for thermal protection of lithium ion battery and preparation method of ethylene-propylene-diene monomer rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First, masticate 100g of EPDM on a double-roller mill for 15 minutes, then add 5g of liquid paraffin, 8g of fiber, and pass the film several times. After the above-mentioned fillers are dispersed evenly by visual inspection, add 5g of nano-zinc oxide and 1g of stearic acid in turn. , 4g zinc borate, 20gADP, 5gOPS, 5g silane coupling agent, 20g white carbon black and other fillers, finally add 20g boron phenolic resin, 2g accelerator CZ, 0.5g accelerator D, 4g dicumyl peroxide and 0.8g Sulfur, thin pass several times under the film.

[0054] Set the thickness of the sample to 3mm and 6mm respectively, park it for more than 8 hours, and then vulcanize it for a certain period of time in a specific mold in a 160°C, 15MPa flat vulcanizer according to the requirements to obtain the final sample according to the test requirements. The vulcanization time is determined by a rotorless vulcanizer, and t90 is used as the vulcanization time. Among them, the vulcanization time of th...

Embodiment 2

[0065] The difference between this embodiment and Example 1 is that the crosslinking agent is selected as bis-(tert-butylperoxycumyl)benzene, wherein the vulcanization time of the 3mm thick sample is 1860s, the 6mm thick sample vulcanization time is 2160s, and the rest Parts are all the same as in Example 1.

[0066] performance test 1

[0067] The thermal weight loss test result is: the temperature when the thermal weight loss reaches 5% is 242°C, the maximum thermal weight loss rate is 14.33(% / min), the corresponding temperature is 462°C during the maximum thermal weight loss rate, and the residual substance mass at 900°C is 28.21%.

[0068] performance test 2

[0069] The backside temperature results show that the stable temperature of the 3mm sample at 500°C is 346°C, and the stable time is 448s; the stable temperature of the 6mm sample is 316°C, and the stable time is 1118s; The temperature is 396°C, and the stabilization time is 1098s.

[0070] performance test 3

...

Embodiment 3

[0075] The difference between this example and Example 1 is that no boron phenolic resin is added, wherein the vulcanization time of the 3mm thick sample is 1560s, the vulcanization time of the 6mm thick sample is 1800s, and the rest are the same as in Example 1.

[0076] performance test 1

[0077] The results of the thermogravimetric test are: the temperature when the thermogravimetric loss reaches 5% is 152°C, the maximum thermogravimetric rate is 21.56(% / min), the temperature corresponding to the maximum thermogravimetric rate is 313°C, and the residual substance mass at 900°C is 17.32%.

[0078] performance test 2

[0079] The back temperature results show that the 3mm sample is burned through at 500°C, the stable temperature of the 6mm sample is 348°C, and the stable time is 869s; the 3mm sample is burned through at 800°C, the stable temperature of the 6mm sample is 423°C, and the stable time is 674s .

[0080] performance test 3

[0081] The results of gas chromatog...

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Abstract

Provided are a thermal protection material for a lithium ion battery and a preparation method of the thermal protection material. Raw materials of the thermal protection material comprises ethylene-propylene-diene-monomer rubber, resin, fiber and assistants, wherein the assistants comprise a flame retardant and one or more selected from a plasticizer, an activator, a coupling agent, a reinforcingagent, a promoter, a vulcanizing agent and other matter. Through the thermal protection material, the thermal protection performance of the lithium ion battery can be improved significantly in the case of sudden combustion, and the surface temperature of the periphery adjacent to and near the lithium ion battery can be reduced by controlling the temperature field, so that the probability of combustion and explosion of the lithium ion battery is reduced.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a EPDM rubber used for thermal protection of lithium-ion batteries, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used as power battery packs in electric vehicles and hybrid electric vehicles because of their many advantages such as high energy density, long cycle life, high energy efficiency, small self-discharge, no memory effect and no pollution. Lithium-ion batteries used in electric vehicles and hybrid vehicles often have high charge and discharge currents and poor heat dissipation conditions, resulting in an increase in the internal temperature of the battery, resulting in thermal runaway. Under abuse conditions, lithium-ion batteries can heat up to about 700°C, which can easily cause a chain exothermic reaction, resulting in smoke, combustion or even explosion. Due to the poor safety of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L61/14C08L79/04C08K3/22C08K5/09C08K3/38C08K13/02
CPCC08K2003/2296C08K2003/387C08K2201/011C08L23/16C08L61/14C08L79/04C08K3/22C08K5/09C08K3/38C08K13/02
Inventor 李向梅乔羽杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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