Patent ID: 7570023
Filing Date: 2009-08-04
Classification: H01M,H02J,Y02E

Abstract:
1. A method of charging batteries, comprising the following steps: (1) Form a battery pack from a plurality of serially connected batteries, and serially connect the battery pack to a power supply; (2) Form a series divider resistor by serially connecting a first divider resistor to a second divider resistor, and parallelly connect the series divider resistor to the battery pack; (3) Connect a microcontroller to the power supply, and parallelly connect the microcontroller to the second divider resistor; (4) Cause the microcontroller to send out a first control signal to the power supply, so that the power supply supplies a constant charge current source to the battery pack; (5) When anyone of the batteries in the battery pack is charged to a first preset voltage value, the battery pack disconnects that battery from a corresponding charging circuit thereof; (6) The microcontroller detects via the series divider resistor a voltage value of the battery pack; when the detected voltage value is smaller than a second preset voltage value, or when a FULL signal out put by the battery pack is received, the microcontroller outputs a RESET signal to all charging circuits, so that all the charging circuits are closed; and (7) Determine whether the number of times the RESET signal has been output has reached a preset value; if yes, power from the power supply is interrupted by the microcontroller to stop charging the batteries; and if not, a second control signal is output by the microcontroller to the power supply, so that the power supply lowers the constant charge current source output thereof, and the charging returns to the step (4).