Residual Bias Compensation Dual Extended Kalman Filter for Physics-Based SOC Estimation in Lithium Iron Phosphate Batteries
Researchers developed a Residual Bias Compensation Dual Extended Kalman Filter (RBC-DEKF) to accurately estimate State of Charge (SOC) in Lithium Iron Phosphate (LFP) batteries. This method separates bias estimation from state estimation using two filters, significantly improving accuracy and voltage prediction compared to standard techniques. Testing showed reduced SOC error and voltage error across various temperatures.