A three-dimensional heat dissipation model is built for the lithium-ion battery pack in an electric vehicle. Both simulation and test are conducted on the temperature field of lithium-ion battery pack in a condition of cruise driving and natural air cooling with a result showing their consistancy in temperature variation trend, meaning the rationality of the model built. On this basis an optimization scheme for the heat dissipation structure of lithium-ion battery pack is proposed and a simulation is performed. The results indicate that after optimization, lithium-ion battery pack has a good cooling effects; the highest temperature of battery pack lowers from 46℃ to 33℃ and the temperature difference among the batteries is less than 6℃.%建立了电动汽车锂离子电池组的三维散热模型.对电动汽车匀速行驶且自然风冷时锂离子电池组的温度场分别进行了仿真和测试,结果表明,两者温度变化趋势基本一致,反映了所建温度场模型的合理性.在此基础上,提出了锂离子电池组散热结构的优化方案并进行了仿真分析,优化后锂离子电池组的散热良好:电池组的最高温度从46℃降至33℃,电池之间的温差在6℃以内.
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