电动汽车用电池SOC定义与检测方法

为建立电动汽车电池管理系统的需要 ,探求铅酸电池荷电状态 (SOC)的实时测量和估计方法 ,分析了当前 SOC定义在变电流放电情况下出现不适应的原因 ,现有各种荷电状态检测方法的特点和存在的问题。在此基础上 ,对 SOC定义进行了修正 ,提出了“标定荷电状态”和“动态荷电状态”的概念 ,使之能很好地适应电动汽车用电池在变电流状态下的实时荷电状态估计。基于修正 SOC定义的电池荷电状态检测方法和计算模型具有简便、实用和可靠性

Research on the SOC definition and measurement method of batteries used in EVs

For the requirement of building up the battery management system of electric vehicles (EVs), the real time measurement and estimation of the state of charge (SOC) of the lead acid batteries are investigated, because the popular SOC definition is unsuitable under the condition of variable current discharge. The reasons of this kind of unsuitability are analyzed, and the characteristics and existing problems of different kinds of SOC measuring methods are compared. On the basis of what mentioned above, some corrections are given to the popular SOC definition, and the conceptions of "calibrated SOC" and "transient SOC" are introduced. The corrected definition of SOC can be suitable for the real time SOC estimation very well under the variable current condition of the batteries used in EVs. Based on the corrected SOC definition, the SOC's measuring method and the computational model are simple, convenient, practicable, and reliable.