Study on Fast Charging Method of Series Connected Lithium-Ion Battery Strings with Intelligent Control

The unbalance phenomenon of lithium-ion batteries undercharging and the discharging condition is presented. Constant current and constant voltage controller and fuzzy controller are designed and simulated to evaluate the charging time for series-connected lithium-ion batteries. The charging methods are all evaluated and verified in the MATLAB/SIMULINK environment. The CC-CV controller and fuzzy controller are used to adjusting the charging current for series-connected lithium-ion batteries. The proposed method not only decreases the battery temperature but also improves the performance of the charging in the lithium-ion the battery. Eventually, To study the fast charging methods for minimizing battery temperature rising is important to extend the life cycle of the battery.