Fast Charge of a Battery Considering Temperature

This paper aims to study the recharge time for a battery as a function of the temperature. An electro-thermal model is used for the battery to simulate the evolution of the battery temperature. The electrical parameters of the battery are dependent on the battery temperature and the state of charge. They have been characterized from an electric vehicle Lithium Iron Phosphate (LFP) cell. Instead of a classical Constant Current, Constant Voltage (CC-CV) technique, a current trajectory is used for charging. The goal is to recharge at maximal admissible current to be as fast as possible. The maximal admissible charge current is a function of the battery internal temperature. Simulation are performed for a 0 °C to 40°C temperature range for ambient temperature. The simulation results show that the fast charging is slower when the ambient temperature is increasing.