CHARGING METHOD AND CHARGING DEVICE USING THE SAME

摘要

A charging method is provided for charging a battery unit. Firstly, a current change amount is set, and a predetermined time interval is determined according to characteristics of the battery unit. When the charging device is enabled, a charging current with a constant current value is provided to charge the battery unit. If a detected parameter of the battery unit reaches the threshold value, a constant charging voltage is provided to the battery unit. Moreover, the current value of the charging current is decreased by the current change amount. The number of times the current change amount is decreased is determined according to a predetermined counting value. That is, the current value of the charging current is stepwise decreased according to a time control mechanism.

主权项

1. A charging method for charging a battery unit by a charging device, the charging method comprising steps of:
(a) setting a current change amount, and determining a predetermined time interval according to characteristics of the battery unit; (b) providing a charging current to charge the battery unit when the charging device is enabled, wherein a current value of the charging current is constant; (c) judging whether a detected parameter of the battery unit reaches a threshold value; (d) if the detected parameter of the battery unit reaches the threshold value in the step (c), providing a constant charging voltage to the battery unit, and decreasing the current value of the charging current by the current change amount; (e) accumulating a counting value by 1; (f) starting counting an elapsed time period after the step (e); (g) judging whether the elapsed time is shorter than the predetermined time interval; (h) if the elapsed time is not shorter than the predetermined time interval in the step (g), judging whether the accumulated counting value is smaller than a predetermined counting value; (i) if the accumulated counting value is smaller than the predetermined counting value in the step (h), repeatedly performing the step (d); and (j) if the accumulated counting value is not smaller than the predetermined counting value in the step (h), maintaining the current value of the charging current, and the step (c) is repeatedly done.