Study of Optimal Charging Method for Lithium-Ion Batteries Considering Charging Time and Energy Loss

The increasing prevalence of lithium-ion batteries has heightened the significance of considering energy efficiency during fast charging. Fast charging currently relies on increasing the current, which leads to two issues: the larger current affects the terminal voltage and causes increased energy loss in the battery. For this reason, this paper proposes a charging method for lithium-ion batteries that addresses both energy loss and charging time, aiming to minimize energy loss while maintaining a specific charging speed. The constructed electro-thermal coupling model forms the basis for applying the non-dominated sorting genetic algorithm with elite strategy (NSGA-II) to solve the dual-objective problem. This approach aims to derive the optimal charging current curve, considering both the energy loss and charging time. Finally, experimental verification demonstrates that this charging method surpasses the traditional constant-current charging method, specifically the CC-2C constant-current charging strategy, in regards to charging efficiency and power consumption.