软包电池组的冷却结构设计及热仿真优化

Cooling structure design and thermal simulation optimization of soft pack battery

针对17.5 Ah的三元锂离子软包电池,建立其电池生热模型,得到不同放电倍率下的温升特性。之后,分析了5种不同流程的液冷板,得到方案E液冷板较优。并在此基础上研究了不同流道宽度、扰流柱大小与排布等结构参数对液冷板压差及电池温升的影响,以及导热片的厚度与导热硅胶垫的热阻对电池温升的影响。结果表明,流道宽度为50 mm、扰流柱大小为8 mm、数量为12个、采用叉排的方式能实现压差与温升的最优化。在0.5 mm厚度的导热片结合方案E冷板,能够实现电池最高温度控制在40℃以下,电池单体间的温差在5℃以内,使电池工作在适宜的温度范围内。

In this paper,for the ternary lithium-ion soft pack battery of 17.5 Ah,the battery heat generation model was established,and the temperature rise characteristics under different discharge rates were obtained.After that,five liquid cooling plates with different processes were analyzed.It is found that the liquid cooling plate of scheme E is better.On this basis,the influence of structural parameters such as different channel widths,the size and arrangement of the spoiler column on the pressure difference of the liquid-cooling plate and the temperature rise of the battery was studied.And the influence of the thickness of the thermal conductive sheet and the thermal resistance of the thermal conductive silicone pad on the temperature rise of the battery was also researched.The results show that the flow channel width is 50 mm,the size of the spoiler column is 8 mm,the number is 12,and the method of fork row can realize the optimization of pressure difference and temperature rise.The 0.5 mm thick thermal conductive sheet combined with the scheme E cold plate can control the maximum temperature of the battery below 40℃,and the temperature difference between the battery cells is within 5℃,so that the battery can work within a suitable temperature range.