车用锂离子电池荷电状态参数辨识的建模仿真

为得到较为准确的电池荷电状态（SOC）参数，以厦门理工学院纯电动赛车用锂离子电池作为研究案例，采用二阶RC等效电路模型对锂离子电池进行HPPC充放电试验；然后，将实验数据导入Matlab的参数估计模块后，对电池荷电状态性能参数进行辨识。在Matlab的Simscape模块中建立锂离子电池的仿真模型，将仿真结果与实验结果进行比较，利用拟合工具箱对比不同阶次下RC等效电路模型的拟合精度。结果表明，锂离子电池的电压在放电脉冲开始及结束阶段时偏差较大，静置阶段则趋于平稳，二阶RC等效电路模型能够较为简便地反应锂离子电池的工作特性，且具有较好的拟合精度。锂离子电池仿真模型与实验测试的误差在2%以内，验证了所建立的仿真模型的可行性。

Modeling and Simulation on SOC Parameter Identification of Lithium ion Batteries for Cars

The proposed research is designed to establish a validated battery model of electric racing car of Xiamen University of Technology.First,apply Hybrid Pulse Power Characteristic test for lithium ion battery base on 2 RC equivalent circuit,import the experiment data to parameter estimation module in Matlab,and then complete the battery performance parameters identification.Next,establish battery simulation model in Matlab/Simscape,compare the experimental result with simulation result,and compare accuracy of different RC equivalent circuit by using the MATLAB curve fitting toolbox.The result shows that the voltage of the lithium ion battery has a large deviation at the beginning and end of the discharge pulse phase and a generally stable state at the static phase,2 RC equivalent circuit can reflect the working characteristics of lithium ion battery in a simple and accurate manner,and the relative error is within 2%,which verifies the feasibility of the simulation model.