全特征扰流元电池液冷板传热优化与实验研究

Optimization and experimental study of heat transfer in liquid-cooled plate of full-featured disturbance element cells

低热阻、低压损和均匀温度的液冷板对保障动力电池包续航里程、延缓电芯寿命衰减具有重要意义.以改善液冷板传热性能为目标,以某款动力电池包液冷板为对象,构建温度均匀性系数,提出新型全特征扰流元模型.开展扰流元特征参数和布置参数寻优,搭建液冷板传热实验台架,验证温度和压降仿真结果的准确性.结果表明:当扰流元的结构宽度与长度之比为1、扰流元的结构宽度与流道宽度之比为0.5、2个扰流元间隔为15 mm时,液冷板综合性能最佳.优化后液冷板温度均匀性系数由0.339降到0.121,优化幅度为180.16%;优化后液冷板最高温度为24.7℃,温差为3℃,仿真计算结果与实验结果的综合误差为3.79%.

A liquid-cooled plate with low thermal resistance,low-pressure loss and uniform temperature is important to guarantee the range of the power battery pack and delay the decay of cell life.To improve the heat transfer performance of the liquid-cooled plate,a power battery pack liquid-cooled plate was used as the object,the temperature uniformity coefficient was constructed,and a new full-featured disturbance element model was proposed.The characteristic parameters and arrangement parameters of the disturbance element were optimized,and a liquid-cooled plate heat transfer experimental rig was built to verify the accuracy of the simulation results of the temperature and pressure drop.Results showed that when the ratio of width to length of the disturbance element structure was 1,the ratio of disturbance element structure width to runner width was 0.5,and the interval between two disturbance elements was 15 mm,the comprehensive performance of the liquid-cooled plate was optimal.After optimization,the temperature uniformity coefficient of the liquid-cooled plate was reduced from 0.339 to 0.121,with an optimization range of 186.03%;the maximum temperature of the liquid-cooled plate after optimization was 24.7℃,with a temperature difference of 3℃,and the comprehensive error between simulation calculation results and experimental results was 3.79%.