电池液冷系统冷却板厚度对散热性能影响研究

Study on influence of thickness of cold plate in battery liquid cooling system on heat dissipation performance

带冷却板的电池液冷系统因体积较小、结构稳定及冷却效果好,得到了普遍的关注。之前的学者对冷却板材料、管路结构、环境温度和冷却液入口状态对冷却板散热性能的影响做了较多研究,但对于冷却板厚度对散热性能影响的研究却很少,因此利用流体力学仿真工具,对不同厚度冷却板的冷却模型进行有限元分析。结果显示,不同厚度冷却板下,电池模块温度变化较小,但冷却液出入口压降值变化较大。又进行不同放电倍率下,冷却液入口状态参数(温度与质量流率)的研究,发现冷却液入口温度与电池模块最高温度、最低温度之间呈线性变化;冷却液入口质量流率的变化可以同时引起电池模块最高温度和模块间温差的变化。

Cold plate liquid cooling system because of a small volume,stable structure,and good cooling effect has received widespread attention.Previous scholars have done more research on the effects of cold plate material,runner structure,ambient temperature and coolant inlet state on the dissipating effect of cold plates,but there are few studies on the thickness of cold plates,because the thickness of cold plates is also affected.The important parameters of cooling system volume and heat dissipation capacity were used.Therefore,the finite element analysis of cold plate cooling models with different thicknesses was established by using fluid dynamics simulation tools.The results shows the variation of temperature is slight for the battery module under different cold plate thichness condition.However,the value of coolant inlet and outlet pressure drop is notably changed.Further research on different discharge rates and coolant inlet state parameters(temperature and mass flow rate)revealed a linear change between the cooling inlet temperature of coolant and the maximum and minimum temperatures of the battery module.The change in the inlet mass flow rate of the coolant can simultaneously cause a change of the maximum temperature and the temperature difference in the battery module.