Patent ID: 8994337
Filing Date: 2015-03-31
Classification: H02J,Y02E

Abstract:
1. A method of balancing a battery pack comprising a plurality of battery cells, the method comprising: determining whether a current period is a high voltage change period during which a change of a voltage of the battery cells during charging or discharging the plurality of battery cells is larger than a threshold or is a low voltage change period during which the change is less than the threshold; starting balancing based on an imbalance between the plurality of battery cells when the plurality of battery cells are in the high voltage change period; and maintaining the balancing if a balancing accumulation time of the plurality of cells is less than a determined balancing time when the plurality of battery cells are in the low voltage change period, wherein the current period being a high voltage change period during which a change of a voltage of the battery cells during charging or discharging the plurality of battery cells is larger than a threshold is determined at a first time, and being a low voltage change period during which the change is less than the threshold is determined at a second time.