Abstract: The status of electric connection in automobile power battery is one of the key factors whether the overall performance of the battery pack can be fully utilized. In order to analyze influence of different electrical connection conditions on the temperature of the battery module, based on the finite element simulation platform ANSYS/Fluent, the temperature distribution of three groups series battery modules with different contact resistance at 0.5 C, 1 C and 2 C discharge ratios was studied. It is shown that under the same discharge rate working conditions, the increase of contact resistance will make the highest temperature and lowest temperature of different cell groups have obvious increasing trends; the difference between the highest temperature and the lowest temperature also increases with the increase of contact resistance; different parts of different cells of the same battery module also have large temperature differences due to the presence of contact resistance.

Key words: Electric vehicle; Battery module; Contact resistance; Temperature distribution; Simulation analysis

摘要： 电动汽车动力电池的电连接接触状况是电池组整体性能能否充分发挥的关键因素之一。 为了分析不同电连接接触状况对磷酸铁锂电池模块的温度影响，论文基于有限元仿真平台 ANSYS/Fluent，研究了三组不同接触电阻的串联电池模块在 0.5 C、1 C、2 C 放电倍率下的温 度分布。结果表明，在相同放电倍率工况下，接触电阻的增大会使不同电芯组的最高温、最 低温都有明显的上升趋势；最高温、最低温的差值也随着接触电阻的增大而增大；同一电池 模块的不同电芯的不同部位也因为接触电阻的存在出现较大的温度差异。

关键词: 电动汽车；电池模块；接触电阻；温度分布；仿真分析