Research on Li-ion Battery Charging

Proper control and charging equalization are two key technologies in Li-ion battery charging system. This paper in troduces the importance of the control and equalization method in Li-ion battery charging process by the Matlab simulation and charging examples, and presents apractical equalization circuit and its principle, which has been applied well in a charging system. As a controller, the traditional proportional integrative derivative(PID) has many shortcomings in Li-ion battery charging process, accordingly, a new control method based on fuzzy PID algorithm is presented. The simulation results proves that the compound fuzzy PID controller is better than the traditional PID controller in Li-ion battery charging system.