关键词: 热管理系统；电动汽车；分离式；动力电池；相变材料；热管

Abstract: In view of the problems existing in the thermal management of power batteries, this paper proposed a heat pipe assisted separation battery thermal management system, and built the power battery heat dissipation temperature characteristics of the experimental platform, the power battery thermal management system, analyzed the system to control the temperature and temperature difference of the battery pack. The heat dissipation performance of the power battery thermal management system under the condition of constant discharge of power battery at 1 C, 3 C, 4 C and 5 C, and under different "discharge-charge" cycle conditions were carried out respectively. The results show that compared with other cooling methods, the system has a more suitable operating temperature and can better reduce the temperature imbalance in the battery pack. Even at the extremely high discharge rate of 5 C, the maximum temperature difference can be controlled within 5℃, and the temperature imbalance within a single battery can be greatly improved. Especially in the case of long-term operation, the maximum temperature of each cycle is much lower than that of the traditional phase change material cooling mode, and the reliability and performance of the system are greatly improved.

Key words: Thermal management system; Electric vehicle; Separation type; Power batteries; Phase change material; Heat pipe