Patent ID: 8704488
Filing Date: 2014-04-22
Classification: H02J

Abstract:
1. A battery pack comprising; a plurality of battery cells; and a computer, wherein the computer is configured to: determine voltages of the plurality of battery cells when the battery cells are in an open circuit voltage (OCV) state after the plurality of battery cells are fully charged or over-discharged; determine a battery cell having a lowest voltage of the plurality of battery cells; compare a difference between the a voltage of the battery cell having the lowest voltage and each of the voltages of the other of the plurality of battery cells to a specified value; and perform cell balancing on at least one of the other of the plurality of battery cells if the voltage of the at least one of the other of the plurality of battery cells is larger than the voltage of the battery cell having the lowest voltage by more than the specified value; wherein the computer is configured to perform the cell balancing in a sleep mode.