Innovative Incremental Capacity Analysis Implementation for C/LiFePO4 Cell State-of-Health Estimation in Electrical Vehicles
Résumé
This paper presents a fully embedded state of health (SoH) estimator for widely used C/LiFePO4 batteries. The SoH estimation study was intended for applications in electric vehicles (EV). C/LiFePO4 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/LiFePO4 cells from one manufacturer was tested on C/LiFePO4 cells from another LFP (lithium iron phosphate) manufacturer.
Mots clés
lithium-ion battery
lithium iron phosphate
LFP
LiFePO4
remaining capacity
state of health (SoH)
accelerated ageing
battery management system
battery management system (BMS)
calendar ageing
cycling ageing
electric vehicle
embedded algorithm
incremental capacity analysis
incremental capacity analysis (ICA)