锂电池动态系统Thevenin模型研究  

Study on dynamical system Thevenin model of Li-ion battery

作　　者：魏增福[1] 董波[2] 刘新天[2] 何耀[2] 曾国建[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]合肥工业大学新能源汽车工程研究院,安徽合肥230009

出　　处：《电源技术》2016年第2期291-293,415,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(21373074);安徽省国际合作项目(1303063010)

摘　　要：建立高精度的电池模型对于电动汽车动力锂电池的应用研究有重大意义。锂电池在使用过程中,其系统参数会跟随外界环境及荷电状态变化而改变,选用固定参数的电池模型会导致模型精度差。提出一种动态系统Thevenin模型。结合影响锂电池特性的荷电状态和环境温度因素,将经典Thevenin模型中的欧姆内阻、极化内阻、极化电容等固定参数,在动态系统Thevenin模型中描述为随荷电状态与温度动态变化的变量。最后选取单体锂电池为实验对象,采用HPPC实验辨识模型参数,对经典模型与动态系统模型分别进行仿真分析,结果表明,动态系统Thevenin模型能更准确描述锂电池性能。Establishing high-precision battery model was of great significance for the application of electric vehicles power Li-ion battery. The system parameters of the Li-ion battery would change follow the changes of external environment state and the State-of-Charge, fixed parameters battery model would lead to poor accuracy. For this problem,a dynamic system. Thevenin model was proposed. Fixed parameters in the classical Thevenin model such as ohm resistance, polarization resistance and polarization capacity etc, would be described as variables change with the State-of-Charge and temperature dynamically,combining with the State-of-Charge and temperature which affect lithium characteristics. Finally,do simulated analysis for the classical model and dynamic system model,using HPPC experimental identify the model parameters with Li-ion battery monomer selected as experimental subjects.The results show that the dynamic system, Thevenin model could more accurately describe the performance of lithium batteries.

关 键 词：电动汽车 锂电池 Thevenin模型 荷电状态 

分 类 号：TM912[电气工程—电力电子与电力传动]