Abstract: An intelligent wireless charging and discharging system for lithium-ion battery packs has been proposed in this paper.The system mainly consists of two parts:a wireless power transmission based on electromagnetic induction and an intelligent lithium-ion battery charging/ discharging management system.This system charges battery packs connected in different series and parallel ways by constant current/ constant voltage method with input/output under voltage lock-out protection,output over voltage protection,charging status indicators,temperature indicator and after charging recovery function.The highest charging efficiency of this system is close to 70%.The voltages of all cells after charging are higher than 4.1V,close to full voltage 4.2V and the maximum voltage difference is less than 0.03V,which achieves the effect of intelligent balancing charging.The discharging test shows that the circuit is always lock out at about 10.3V which protects and prolongs service life of the battery packs.