Charging method and circuit for chargeable battery

This invention relates to a charge method and a circuit for charge cells, in which, the method includes: controlling the output charged current to rise from zero to the peak value Im of the charge current in the specific time period t1 to t2 by adjusting the duty ratio of PWM control signal, and t1 and t2 are the beginning and ending time of the rising stage of the current, setting t the time as the X shaft, i the charge current as the Y shaft, keeping the peak value in the period of t2 to t3 to output charged current continuously, t3 is the ending time of the stable stage, the circuit includes a MCU process circuit and a current control circuit, and the MCU process circuit outputs PWM control signal of the monotony change of the duty ratio to the switch tube conversion circuit in the specific time period t1 to t2 and the output current of the current control conversion circuit rises to the peak value IM of the charge current.