电动汽车锂离子动力电池建模及温度场分析

Modelling and Study on Temperature Field for Lithium-ion Battery in Electric Vehicles

以18650锂离子动力电池为研究目标,根据锂离子电池的结构特点,对单体电池模型进行合理简化,建立电池芯体径向和轴向的热阻模型,并依据该热阻模型计算电池芯体的平均导热系数,利用相关参数建立有限元单体电池模型,同时利用相关设备对单体电池进行了不同放电倍率的温度测量试验。仿真与试验结果表明了单体有限元模型的有效性。在验证的单体有限元模型基础上,还探讨了三种不同换热端口位置对电池组冷却效果的影响。

According to the structure characteristics of the lithium ion battery,the radial and axial thermal resistance model of the battery core body,which is used to calculate the average thermal conductivity,has been established based on reasonable simplification to the battery model with 18650 lithium-ion power battery as the research target.The finite element model of a battery cell was built on the basis of relative parameters,and temperature measurement tests were carried out by means of related equipment with different discharge rate of a battery cell.At the same time,comparisons of effectiveness between results of the simulation and the experiment were verified for the finite model of monomer.Depending on the earlier finite model,influences of three different heat transfer port positions on cooling effects of the battery pack were discussed.