动力电池组散热性能分析

Analysis of Heat Dissipation Performance of Power Battery Pack

新能源电动汽车是未来的发展趋势,锂离子电池因其能量密度高、自放电率低、输出电压高等特点,被广泛作为电动汽车的动力电池。动力锂电池在大功率放电过程中产生较高的热量,易发生自燃、爆炸等事故。根据锂离子电池放电生热的特点建立模型,用计算机仿真的方法,对动力电池组进行建模分析。分析结果表明,随着工质流速的增大,电池组表面的温度逐渐降低,当电池组表面工质流速达到50 m/s后,温度降低幅度逐渐变小,趋向于某一固定值,且降温所需能耗与降温幅度之比大大增加,不再具有可行价值。

New energy electric vehicles are the development trend of the future,lithium ion battery because of its high energy density,low self-discharge rate,high output voltage characteristics,is widely used as the power battery of electric vehicles.In the process of high-power discharge,high heat is generated in power lithium battery,which is prone to spontaneous combustion and explosion.According to the characteristics of heat generation in the discharge of lithium ion battery,the model of power battery is established and analyzed by computer simulation in this paper.The analysis results show that the temperature on the surface of the battery pack decreases gradually with the increase of the working fluid flow rate.When the working fluid flow rate on the surface of the battery pack reaches 50 m/s,the temperature reduction range on the surface of the battery pack gradually decreases and tends to a fixed value,and the ratio of energy consumption required for cooling to the cooling range increases greatly,which is no longer of viable value.