换电运营电动汽车动力电池热管理技术分析

Analysis of Thermal Management Technology for Power Battery of Electric Vehicle on Battery Swap Mode

为了提高电动汽车自然冷却形式电池的散热能力,在普通结构电池包基础上,提出了一种新的动力电池导热结构。建立导热结构和普通结构电池仿真模型,并采用仿真计算和试验测试相结合的方法,验证了仿真模型的正确性。基于仿真模型,对比分析了城市工况和爬坡工况下换电运营电动车导热结构和普通结构动力电池的电芯温度变化情况。结果表明:换电电动车在城市工况和爬坡工况运营过程中,导热结构电池包相较于普通结构,电芯平均温度下降更快,且温度普遍较低,有利于提升电动车动力电池安全性能及寿命。

In order to improve the heat dissipation capability of natural cooling battery of electric vehicle, a new thermal conductive structure of power battery is proposed based on the ordinary structure battery pack. The simulation models of thermal conductive structure and ordinary structure are established, and the correctness of the simulation models is verified by combining simulation calculation and test. Based on the simulation models, the battery temperature changes of thermal conductive structure and of ordinary structure under urban and climbing conditions are compared and analyzed for battery-swapping electric vehicle. The results show that the average temperature of the battery with thermal conductive structure decreases faster and the temperature is generally lower than that of the ordinary structure battery during the operation of the electric vehicle under urban and climbing conditions, which is conducive to improve the safety performance and prolong the cycle life of the power battery of electric vehicle.