SOC estimation performance comparison based on the equivalent circuit model using an EKF in commercial LicoO2 and LiFePO4 cells

초록

This study gives a comparison of an Equivalent Circuit-Model (ECM)-based SOC performance using an Extended Kalman Filter (EKF) algorithm for commercial LicoO2and LiFePO4 cells with an emphasis on the model considering parameterization and noise-modeling with data rejection technique. Firstly, introduces the difference in modelling between both of the cells caused by the Open-Circuit-Voltage(OCV) characteristics. Secondly, this works attempt to show the difference of SOC performance with an increased RC-ladder number in the EKF, namely parameterization. Additionally, comparison of SOC performance with and without noise model and data rejection are implemented to reduce the model error caused by the simplified ECM.