电池包液冷散热结构设计及影响因素分析

Design of battery pack liquid cooling structure and analysis of influencing factors

液冷板流道结构对电池散热效果与均温性有显著影响。在对比不同结构液冷板的散热性能时,约束各种冷板结构的液体质量流量来进行仿真研究。设计了不同的散热结构方案并在相同质量流量的条件下进行了散热仿真,对比各设计方案的散热效果和泵功耗等。探讨了进水口内径、壁厚、水温等对散热效果的影响。结果表明,横向并联式冷板结构散热效果最好,内径、壁厚及水温分别选取36 mm、2 mm和25℃。最终设计的散热方案满足了电池包最佳工作温度范围20~50℃和最大温差5℃的温控要求。

The structure of liquid cooling plate has a significant impact on batteries’heat dissipation effect and homogenization.When comparing the heat dissipation performance of different structures,the liquid mass flow of various cold plate structures is constrained for simulation study.First,different heat dissipation structure schemes are designed and the heat dissipation simulation is conducted under the same mass flow condition to compare the heat dissipation effect and pump power consumption of each design scheme.On this basis,the influence of the water inlet diameter,wall thickness and water temperature on the heat dissipation effect is discussed.Our results show the heat dissipation effect of transverse parallel cold plate structure is the best with inner diameter,wall thickness and water temperature standing at 36 mm,2 mm and 25℃ respectively.Our ultimate heat dissipation scheme meets the temperature control requirements of the optimal operating temperature range of the battery pack of 20~50℃ and the maximum temperature difference of 5℃.