Aging characterization of lithium iron phosphate batteries considering temperature and direct current undulations as degrading factors
Résumé
This paper presents the aging characterization and modeling of lithium iron phosphate (LiFePO4) batteries. The research work suggested here aims to characterize the aging of the resistances and the capacities of the batteries as a function of using temperature and direct current undulations. The proposed model of the LiFePO4-batteries is for multi-source systems such as distributed power generation systems based renewable energies. The performances of the batteries used in these systems can be affected by the temperature and the DC-current undulations. The characterization system takes into account the temperature and the DC-current undulations as thermal and electric constraints for batteries. The experimental tests are performed through charging and discharging operations using calibrated fluctuating DC-current waveforms. The experimental measurements and simulations results found are similar with a deviation less than 1%. Hence the proposed model is very appropriate to predict the degradation of battery parameters caused by combined impacts of direct current undulations and the temperature.
Mots clés
Battery characterization
Battery modeling
Direct current undulations
State of Charge
Temperature impact
Battery improved model based on variations of capacitances/resistances and capacity
Batteries
Temperature measurement
Voltage measurement
Discharges (electric)
Aging
Battery charge measurement
Mathematical model