Heat dissipation performance of honeycomb-like thermal management system combined CPCM with water cooling for lithium batteries

doi:10.19799/j.cnki.2095-4239.2021.0292

Abstract

Abstract:

In order to further reduce the temperature rise, maximum temperature difference and axial temperature difference of cylindrical lithium batteries under high thermal load, a honeycomb-like battery thermal management system combined paraffin/expanded graphite (EG) phase change material (PCM) with water-cooling was proposed. Through numerical simulation, the effects of the coolant flow rate, the number of micro-channels, the thickness of CPCM (composite phase change material) and the mass fraction of EG on the heat dissipation performance of the system was investigated at the ambient temperature of 40 ℃. The results show that when the liquid rate exceeds 0.05 m/s, the continued increase in flow rate does not significantly improve the heat dissipation performance of the system. Compared with pure PCM, the CPCM mixed EG can significantly improve the heat dissipation performance of the system. When the EG mass fraction is 12%, and at different liquid flow rates, the maximum temperature difference of the battery can be met, and the maximum temperature of the battery and the liquid phase ratio of CPCM can be ensured to be the lowest, namely, the system has the best heat dissipation effect; comprehensively considering the uniformity of battery temperature distribution, space utilization and the additional energy consumption of the system, the optimal thickness of CPCM is determined to be 2 mm. When the number of micro-channels is 6, maximum temperature difference and axial temperature difference of battery is the smallest at different liquid flow rates; Especially at a 4 C discharge rate, when the flow rate is 0.01 m/s, the maximum temperature, maximum temperature difference and axial temperature difference of the battery are 45.8 ℃, 1.7 ℃, and 0.04 ℃ respectively, which can ensure that the lithium battery works within the optimal temperature range.

Key words: lithium battery, thermal management, composite phase change material, thermal performance, water cooling

CLC Number:

TM 912

Zhiguo AN, Xian ZHANG, Hui ZHU, Chunjie ZHANG. Heat dissipation performance of honeycomb-like thermal management system combined CPCM with water cooling for lithium batteries[J]. Energy Storage Science and Technology, 2022, 11(1): 211-220.

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材料	比热容/[J/(kg·K)]	潜热/(kJ/kg)	热导率/[W/(m·K)]	熔点/℃
纯PCM	2250	270.2	0.2	44
CPCM(6%EG)	1926	258.5	1.23	44
CPCM(12%EG)	1852	242	5.74	44
CPCM(20%EG)	1754	220	10.6	44
CPCM(30%EG)	1631	192.5	13.85	44

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