Patent ID: 8803473

Claim:
A pulse modulation charging method for charging a rechargeable battery device, comprising: setting a first voltage threshold value; providing a current pulse according to a first charge-discharge cycle, wherein the first charge-discharge cycle comprises a first charge current pulse width and a first discharge current pulse width for charging and discharging the rechargeable battery device, and the first charge current pulse width is greater than the first discharge current pulse width; repeatedly charging and discharging the rechargeable battery device according to the first charge-discharge cycle; adjusting the current pulse to a second charge-discharge cycle when the terminal voltage of the rechargeable battery device greater than the first voltage threshold value, wherein the second charge-discharge cycle comprises a second charge current pulse width and a second discharge current pulse width, and the second charge current pulse width is shorter than the first charge current pulse width; and repeatedly charging and discharging the rechargeable battery device according to the second charge-discharge cycle.