基于往复流风冷的动力锂电池热仿真正交分析

随着电动汽车销量的增加,动力电池的热安全问题日益受到关注,电池温度过高会影响电池的性能,严重时会导致热失控的发生。为研究锂电池的放电特性,探究不同因素对电池组往复流风冷散热的影响规律,基于外接UDF的Fluent仿真计算,利用正交试验,分析了入口风速、冷却空气温度、往复流周期三个参数对电池温度分布的影响规律。研究结果表明往复流周期对电池组温度分布均匀性的影响最大,入口风速对电池组最高温度影响最大,而冷却空气温度影响则相对较小。在此基础上,进一步获得了往复流散热性能的最优匹配参数。

Orthogonal analysis of power lithium battery thermal simulation based on reciprocating air cooling

With the increase of the sales of electric vehicles,the thermal safety of power batteries has attracted more and more attention.Excessive battery temperature will affect the performance of batteries,which will lead to thermal runaway in serious cases.In order to study the discharge characteristics of lithium battery and explore the influence rule of different factors on the cooling and heat dissipation of reciprocating flow of battery pack,based on Fluent simulation calculation of external UDF,orthogonal experiment was used to analyze the influence rule of three parameters,namely inlet wind speed,cooling air temperature and reciprocating flow cycle,on the temperature distribution of battery.The results show that the temperature distribution uniformity of the battery is greatly affected by the cycle of the reciprocating flow,the maximum temperature of the battery is greatly affected by the inlet wind speed,and the temperature of the cooling air is relatively small.On this basis,the optimal matching parameters for the heat performance of reciprocating flow are obtained.