液冷锂电池组温度均衡性研究

Study on Temperature Balance of Liquid Cooled Lithium Battery Pack

针对锂电池组在散热过程中易造成温差过大的问题,对提升电池组温度均衡性展开研究。通过实验获得电池内阻与SOC的动态变化关系,计算得出电池生热速率,分析不同冷板高度和冷却液流速对电池组温度的影响,并在此基础上优化冷板结构。结果表明,增大冷板高度和冷却液流速对提升电池组温度均衡性有积极影响,且高度呈梯度变化的冷板结构,温度均衡性要优于高度为定值的结构。30℃环境下,流道结构采用双入口S型流道时,电池组最大温差在1.5℃以内,具有更好的温度均衡性。

Aiming at the problem that the temperature difference of lithium battery pack is too large in the process of heat dissipation,the research on improving the temperature balance of lithium battery pack is carried out.The dynamic relationship between internal resistance and SOC was obtained through experiments,and the heat generation rate of the battery was calculated.The influence of different cold plate height and coolant flow rate on the temperature of the battery pack was analyzed,and the cold plate structure was optimized on this basis.The results show that increasing the height of the cold plate and the coolant flow rate has a positive effect on improving the temperature balance of the battery pack,and the temperature balance of the cold plate structure with gradient height is better than that of the structure with constant height.At 30℃,the maximum temperature difference of the battery pack is less than 1.5℃when the double inlet S-shaped channel is used,which has better temperature balance.