锂电池热特性及散热特性分析

Analysis of the Thermal Characteristics of Lithium Battery Model and the Heat Dissipation Characteristics

在制造锂电池时,设定方法来估算锂电池内部温度是十分必要的。电池模块解决的主要问题是:保持电池模块内单体电池之间一致恒定的温度,避免达到电池本身所要求的温度峰值,引起电池性能的恶化及安全问题。通过单体电池的电化学反应来估算电池的热产生率,为实现这一目的,进行充放电实验来获得电池放电过程中的特性参数。测试是在恒温下进行,模拟仿真设置条件为恒温,自然对流。热产生率是通过热模型方程进行计算的。随后证实热模型的有效性,并将该模型进行简单的散热分析,得出增大空气对流系数可以明显降低温度,这为以后的散热分析奠定了基础。

It is very necessary to set the method to estimate internal temperature of the lithium battery when making lithium battery.The main problems of the battery module are:keep consistent constant temperature between single battery of the battery module,avoid reaching the peak temperature required by the battery itself,causing the worsening of battery performance and safety issue.Through single battery electrochemistry reaction to estimate heat generation rate of battery power,in order to achieve this aim,taking the charging and discharging experiment to obtain the characteristic parameter in the discharging process.Test was conducted under constant temperature,simulation setting constant temperature,natural convection.Through thermal model calculate heat power.Then verify the valid of the thermal model and take the model for simple thermal analysis,conclude that increasing the air convection coefficient can reduce the temperature obviously,which laid the foundation for later heat analysis.