摘要
对某电动汽车电池模组的发热特性进行了热电耦合数值计算,研究了放电倍率、电流进出方式、汇流排接触面积和电流进出位置等对电池模组温度场和电流密度的影响。结果表明:电流放电倍率对温升和汇流排与电池之间的热交换影响较大,高倍率电流充放工况下电池发热分析应该考虑汇流排电热效应的影响。采用电池充放电测试系统对电池模组在不同放电倍率电流工况下的温升情况进行实验研究,在28.5℃的环境温度下,测得最大温升与热电耦合数值计算结果基本一致,说明了数值模拟可很好预测汇流排的温升特性。
A thermo-electric coupling numerical calculation on the heat generation characteristics of the battery module in an electric vehicle is conducted to study the effects of discharge rate, current I/O mode, bus-bar contact area and current I/O position on the current density and the temperature field of battery module. The results show that the discharge rate significantly affects the temperature rise and the heat exchange between bus-bar and cell, thus the analysis on battery heat generation in high current rate charge/discharge conditions should take the electro-thermal effects of bus-bar into consideration. An experimental study on the temperature rise in battery module under different discharge rates is carried out by using battery charge/discharge testing system and under an ambient temperature of 28.5℃, the highest temperature rise measured is basically consistent with the result of thermo-electric coupling numerical calculation, demonstrating that numerical simulation can well predict the temperature rise characteristics of bus-bar.
引文
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