SOC Estimation of Lithium Battery by Combining Ampere-Hour Integration Method with EKF
Aiming at the contradiction between the algorithm complexity and accuracy of SOC esti-mation method,and the accumulated error of current,a SOC estimation method with timely switching between EKF algorithm and ampere-hour integration method is proposed.In the method,the first-order Thevenin equivalent model of lithium-ion battery is analyzed,and the model parameters are identified by compound pulse battery discharge test,and the SOC estimation model based on EFK is established,and the algorithm flow is designed.The ampere-hour integration method and EFK SOC estimation will be carried out alternately according to different working conditions of the battery management system.The verification test results show that the SOC estimation error of the method is less than 1.5%,and it can achieve higher estimation accuracy with less computing resources.The accumulated error caused by ampere-hour integration method can be eliminated in EFK estimation.
万方数据
维普
