HEV用锂离子电池动态模型参数辨识方法研究

Study on Identification approach of Dynamic Model Parameters for Lithium-ion Batteries Used in Hybrid Electric Vehicles

提出一种适用于动力电池等效电路模型的参数辨识算法。基于恒电流充放电试验和复合脉冲功率特性测试工况分别获取平衡电势和欧姆内阻与荷电状态的函数关系,利用动力电池初始状态启动递推最小二乘法辨识电池模型参数建立电池仿真模型,结果表明提出的4步骤RLS算法能很快辨识动力电池关键参数,且误差在2%以内,同时在线辨识功能可实时优化混合动力汽车(HEV)用动力电池的工作区间,延长其使用寿命。

A parameter identification algorithm for equivalent circuit model of power battery is proposed.The functions of equilibrium voltage and ohmic resistance with the state of charge（SOC） are established based on the constant cur-rent charge-discharge test and hybrid pulse power characterization（HPPC） test,and then the four-step recursive least squares（RLS） is started based on the initial state of power battery to identify the model parameters.Finally,the sim-ulation model for power battery is established.The Experimental and simulation results are presented to demonstrate the efficacy of the proposed four-step RLS parameter identification method.It is able to identify the key parameters quickly,and the error is effectively controlled within 2%,and real-time online identification can greatly optimize the working range of power battery and extend its lifespan.