Effect analysis on heat dissipation performance enhancement of a lithium-ion-battery pack with heat pipe for central and southern regions in China

A heat pipe (HP) heat dissipation model of a lithium-ion-battery pack is established for the climate in the central and southern regions in China, and the heat transfer effects of various fins with different spacing and thickness are investigated. According to the change of heat dissipation, inlet and outlet pressure difference and average heat transfer coefficient with fin spacing and thickness, the relatively optimal heat dissipation fin structure parameters are determined, and the battery temperature distribution and temperature change under different discharge rates of the battery pack in a high temperature environment, and the characteristics of the HP heat dissipation battery thermal management system(BTMS) are analyzed and the effects of HP-based BTMS on battery startup heating in low temperature are evaluated. The results show that the optimal parameters are that the fin spacing is 5 mm, the thickness is 2 mm, the air flow velocity varies from 4 to 16 m/s, and the average heat transfer coefficient is 7.6-11.9 W/(m$K). The battery pack using the HP can reach the proper temperature of 288.15 K in 682s, 615s, and 375 s at 1C, 2C, and 4C discharge rates respectively. (c) 2021 Elsevier Ltd. All rights reserved.