Optimized Multi-Stage Constant Current Charging Strategy for Li-ion Batteries

Various methods have been proposed to reduce the charging time of lithium-ion batteries (LIBs). The multi-stage constant current (MSCC) charging technique has gained significant attention as a potential solution among various proposed methods. A study was conducted to investigate the impact of the MSCC charging technique on LIBs. Specifically, this research focused on the MSCC approach that utilizes the state of charge (SOC) as a stage transition criterion during charging. The Taguchi orthogonal arrays (OAs) were employed to identify the optimal charging current for each stage of the MSCC technique. The study explored the implementation of equal and unequal weight strategies to obtain optimal charging patterns. The experimental results were compared to the standard constant current-constant voltage (CCCV) charging method, where the MSCC approach can effectively reduce charging time. However, the MSCC charging approach leads to a slight increase in temperature compared to the CC-CV method. Additionally, the energy efficiency of the MSCC charging method was 0.5% lower than that of the CC-CV method. Despite this, MSCC charging holds potential for fast electric vehicle (EV) charging applications.