Patent ID: 7863863
Filing Date: 2011-01-04
Classification: H02J

Abstract:
1. A multi-cell battery pack charge balance circuit adapted to be connected with a recharge-discharge circuit to charge battery cells in series, the multi-cell battery pack charge balance circuit comprising: a first balance circuit adapted to be connected with a first node of the recharge-discharge circuit, the first balance circuit including a plurality of controlling units, each of the controlling units including a switch element and a resistor element connected with the switch element in series; a second balance circuit adapted to be connected between a second node of the recharge-discharge circuit and the first balance circuit, the second balance circuit having a first branch and a second branch, the first branch including at least one switch element, the second branch including at least one switch element and a resistor element connected with each other in series; and a protection circuit having a plurality of controlling points, the controlling points being connected with the corresponding switch elements of the first and second balance circuits, the protection circuit controlling the switch element of the first branch on and the switch element of the second branch off when all switch elements of the first balance circuit are off, the protection circuit further controlling the switch element of the second branch on and the switch element of the first branch off when at least one of the switch elements of the first balance circuit is on.