动力电池双向热管理系统性能分析与优化

基于工质相变热虹吸效应，提出了动力电池双向热管理系统，通过改变工质充注量，60~220 g时，试验测试了该系统的双向热管理性能，并据此进行系统优化。结果表明：该热管理系统的正常运行有一个最低充注量。系统优化前，加热工况，系统换热功率受充注量的影响小；散热工况，系统的换热功率随充注量的增加而增大，随电池箱初始温度升高而增大，且强制散热效果要优于自然散热；相同充注量，换热板表面的最大温差随电池箱初始温度升高而增大，在3C放电倍率，无法控制电池表面温度低于45℃。系统优化后，圆管换热板系统的换热效果要优于矩形管换热板系统，且在3C放电倍率能将电池表面温度降低至43.4℃，换热板的温度一致性更好。

Performance analysis and optimization of two-way thermal management system for power battery

Based on the phase-change thermosiphon effect of the working fluid, a bidirectional thermal management system for power battery was proposed. By changing the charging amount of the working fluid, the bidirectional thermal management performance of the system was tested at 60—220 g, and the system was optimized accordingly. The results show that there is a minimum charge amount for the normal operation of the thermal management system. Before the optimization of the system, the heating condition and the heat transfer power of the system are less affected by the charging amount. In the heat dissipation condition, the heat transfer power of the system increases with the increase of the charging amount and the initial temperature of the battery box, and the forced heat dissipation effect is better than the natural heat dissipation. With the same charging amount, the maximum temperature difference on the surface of the heat exchange plate increases with the increase of the initial temperature of the battery box. At the discharge rate of 3C, the surface temperature of the battery cannot be controlled below 45℃. After the system optimization, the heat transfer effect of the circular tube heat exchanger plate system is better than that of the rectangular tube heat exchanger plate system, and the surface temperature of the battery can be reduced to 43.4℃ at the 3C discharge rate, and the surface temperature of the heat exchanger plate is more consistent.