Battery thermal management system of electric vehicle based on flexible composite phase change material

doi:10.3969/j.issn.1674-8484.2022.01.017

Abstract

Abstract:

A novel flexible composite phase change material (PCM) composed of styrene-butadiene-styrene block copolymer / paraffin wax /expanded graphite (SBS / PA/ EG) was prepared through melt blending and organic solvent volatilization to improve the thermal safety and reliability of electric vehicle power battery system and to maintain the power battery system within the normal operating temperature range, considering the temperature control characteristics of flexible composite phase change material. The composite PCM was coupled with a plate heat pipe for significantly improving the homogenization temperature and temperature control characteristics of battery thermal management system. The results show that the thermal conductivity of flexible composite phase change material with SBS/PA/EG is increased to 0.62 W/(m?K) at room temperature, and the latent heat enthalpy reaches 102 J/g. When flexible PCM coupled plate heat pipe as the battery thermal management system of electric vehicles was utilized in the battery module, the maximum temperature can be controlled below 42 ℃ and the temperature difference among batteries maintains within 1.0 ℃at 3 C discharged rate of batteries, exhibiting excellent temperature control and temperature uniformity effect.

Key words: battery thermal management system, flexible composite phase change material, expanded graphite (EG), plate heat pipe

CLC Number:

CHEN Youpeng, ZHANG Guoqing, QIN Qichao, QIN Zhuogeng, DENG Jian, LI Xinxi. Battery thermal management system of electric vehicle based on flexible composite phase change material[J]. Journal of Automotive Safety and Energy, 2022, 13(1): 168-175.

Figures/Tables 12

References 21

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组号	EG / %	SBS / %	PA / %	EG / %
No.1	0	30	70	0
No.2	1	30	69	1
No.3 No.4	3 5	30 30	67 65	3 5

组号	EG / %	SBS / %	PA / %	EG / %
No.1	0	30	70	0
No.2	1	30	69	1
No.3 No.4	3 5	30 30	67 65	3 5