改进液冷板结构后CTP动力电池包的热特性

Thermal characteristics of CTP battery with improved structure liquid cooling plate

液冷板结构对新能源汽车动力电池包的温度均匀性具有显著的影响。针对传统“口琴管”液冷板存在均温性差、漏液风险高等不足,改进液冷板设计。通过流-热耦合仿真方法研究了改进的“凸包”、“纵向”和“横向”流道的三种液冷板结构对CTP动力电池包低温加热及驱动耐久冷却工况下传热性能的影响,结果表明,采用“横向”流道结构液冷板,在低温加热工况下,电池包最大温差较采用“纵向”和“凸包”流道结构液冷板分别低7.8和4.4℃;在驱动耐久冷却工况下,电池包最大温差较采用“纵向”和“凸包”流道结构液冷板分别低1.6和0.8℃。通过台架实验对采用“横向”流道结构液冷板的电池包进行热工况验证,电池包最大温差在低温加热工况下不高于7℃,在驱动耐久冷却工况下不高于4℃。这表明“横向”流道结构的液冷板具有良好的热管理性能。

The structure design of liquid cooling plate has a significant influence on the temperature uniformity of the power battery pack of new energy vehicles.Aiming at the shortcomings of the traditional harmonica tube liquid cooling plate,which has poor temperature uniformity and high leakage risk,the design of the liquid cooling plate was improved.The influence of three liquid cooled plate structures with improved convex hull,longitudinal and transverse flow channels on heat transfer performance of CTP power battery pack under low temperature heating and driving durability cooling conditions was studied by fluid-thermal coupling simulation method.The results show that the maximum temperature difference in battery pack is 7.8 and 4.4℃ lower than that in longitudinal scheme and convex scheme under low temperature heating,and 1.6 and 0.8℃ lower than that in longitudinal scheme and convex scheme under driving durable cooling.The maximum temperature difference in the battery pack is less than 7℃ under low temperature heating condition and less than 4℃ under driving durable cooling condition,which indicates that the proposed transverse flow channel scheme has good thermal management performance.