锂离子电池特性建模与SOC估算算法的研究

Research on modeling of lithium-ion battery and the algorithm of SOC estimation

锂离子电池管理系统设计及荷电状态(SOC)估算依赖于电池等效电路模型的建立,在几种常见的动力锂离子电池等效电路模型分析与比较的基础上,通过对动力锂离子电池进行多种特性实验,分析了锂离子电池的动态特性,提出了二阶RC等效电路模型,并验证了模型的准确性。在电路模型基础上运用扩展卡尔曼滤波算法搭建了MATLAB/Siumlink平台上的仿真模型,通过仿真和实验结果的对比,验证该模型具有较高的估算精度,可用于锂离子电池SOC的实时估算。

Lithium-ion battery management system design and State of Charge（ SOC） estimation depend on the battery equivalent circuit model.Based on the analysis and comparison,in several common lithium-ion battery equivalent circuit model,through a variety of lithium-ion battery characteristic experiments,the dynamic characteristics of lithium-ion battery are analyzed. The second order RC equivalent circuit model is put forward,and the accuracy of the model is verified. On the basis of the circuit model,the simulation model of MATLAB / Siumlink platform is built by using EKF filtering algorithm. It is verified that the model has higher estimation accuracy through the comparison between results of simulation and experiment,and can be used in the real-time estimation of lithium-ion battery SOC.