Patent ID: 7193390
Filing Date: 2007-03-20
Classification: H01M,Y02E

Abstract:
1. An apparatus for connecting a first secondary battery cell and a second secondary battery cell in series, comprising: first connecting means for connecting the first secondary battery cell and a first capacitor in parallel, a first electrode of the first secondary battery cell not being connected to a ground potential; and second connecting means for connecting the first capacitor and a second capacitor in parallel, a first terminal of the second capacitor being connected to the ground potential, wherein the first connecting means connects the first secondary battery cell and the first capacitor in parallel such that the first secondary battery cell charges the first capacitor, the first secondary battery cell is then disconnected from the first capacitor while the second connecting means connects the first capacitor and the second capacitor in parallel to move electric charges from the first capacitor to the second capacitor, the potential of the second capacitor is then detected as the output voltage of the first secondary battery cell, and the second capacitor is discharged, wherein the second capacitor is subsequently charged and the potential of the second capacitor is detected as the output voltage of the second secondary battery cell, wherein the detections of the potential of the second capacitor corresponding to the first secondary battery cell and the second secondary battery cell provide a lower detected output voltage and a higher detected output voltage, and wherein one of the first secondary battery cell and the second secondary battery cell that has the lower detected output voltage than the other secondary battery cell is charged to the higher detected output voltage balance the voltage of the first secondary battery cell and the second secondary battery cell.