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

摘要： 针对目前动力电池热管理存在的问题，论文提出一种热管辅助的分离式电池热管理系 统，并搭建了动力电池散热温度特性实验平台，对动力电池热管理系统进行了实验研究，分 析该系统对电池组温度及温差的控制作用。分别进行了动力电池热管理系统在动力电池以 1 C、 3 C、4 C 和 5 C 等恒流放电条件下，以及不同的“放电-充电”循环工况下的散热性能。结果 表明，与其他冷却方法相比，该系统具有更合适的工作温度，能更好地降低电池组内部的温 度不平衡。即使在 5 C 的极高放电率下，最大温差也可以控制在 5 ℃以内，而且可以大大改善 单体电池内的温度不平衡。特别是在长时间运行的情况下，各循环的最高温度远低于基于传 统相变材料冷却模式，系统的可靠性和性能得到了很大的提高。

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