Innovative Incremental Capacity Analysis Implementation for C/LiFePO4 Cell State-of-Health Estimation in Electrical Vehicles

This paper presents a fully embedded state of health (SoH) estimator for widely used C/LiFePO 4 batteries. The SoH estimation study was intended for applications in electric vehicles (EV). C/LiFePO 4 cells were aged using pure electric vehicle cycles and were monitored with an automotive battery management system (BMS). An online capacity estimator based on incremental capacity analysis (ICA) is developed. The proposed estimator is robust to depth of discharge (DoD), charging current and temperature variations to satisfy real vehicle requirements. Finally, the SoH estimator tuned on C/LiFePO 4 cells from one manufacturer was tested on C/LiFePO 4 cells from another LFP (lithium iron phosphate) manufacturer. View Full-Tex