目的 解决软包锂离子电池组充放电过程中温差大、能耗高等问题，使电池组在适宜的温度范围内运行。方法 设计扁平热管-液冷复合的电池冷却系统，通过建立热-流耦合的有限元模型，对不同冷却液流量、电池放电倍率及热管尺寸下的动力电池冷却过程进行仿真分析。结果 在20 ℃下，冷却液流速为0.02 m/s时，电池中心最高温度较不使用冷却系统时下降了17.9 ℃。3C倍率放电时，扁平热管-液冷复合的电池冷却系统中电池最高温度为37.3 ℃，较液体冷却降低了14.2 ℃。热管长度为200 mm时，电池中心最高温度降温幅度为31.5%。结论 扁平热管与液冷相结合的冷却系统可有效降低动力电池运行过程中的温度，提高电池温度的均匀性，降低电池因某部分过热导致热失控的可能性。

The work aims to address the issues of large temperature differences and high energy consumption during the charging and discharging processes of lithium-ion battery packs, and to ensure that the battery packs operate within an appropriate temperature range. A flat heat pipe-liquid cooling hybrid battery cooling system was designed. Through the establishment of a thermal-fluid coupling finite element model, the cooling process of power batteries under different cooling fluid flow rates, battery discharge rates, and heat pipe dimensions was simulated and analyzed. At an ambient temperature of 20 ℃, when the cooling fluid flow rate was 0.02 m/s, the maximum temperature at the center of the battery decreased by 17.9 ℃ compared to that under no cooling system. During 3C rate discharge, the maximum temperature of the battery in the flat heat pipe-liquid cooling hybrid battery cooling system was 37.3 ℃, which was 14.2 ℃ lower than that of liquid cooling alone. When the heat pipe length was 200 mm, the maximum temperature at the center of the battery decreased by 31.5%. The flat heat pipe-liquid cooling hybrid cooling system effectively reduces the temperature of power batteries during operation, improves the temperature uniformity of the batteries, and reduces the possibility of thermal runaway caused by overheating in certain parts of the battery.