Patent ID: 8134338

Claim:
A battery management system for managing a battery having a plurality of cells for supplying power to a vehicle, the battery management system comprising: a sensing unit for measuring a voltage of each of the plurality of cells; a first cell balancing driver for discharging at least one first cell of the plurality of cells when the vehicle is in a temporary stop state or a running state; and a second cell balancing driver for transmitting the energy received from an over-charged cell to an over-discharged cell when the vehicle is in a stop state, wherein the battery management system detects at least one first cell among the plurality of cells needing to be balanced according to a measured voltage of each of the plurality of cells, and performs a cell balancing operation on said at least one first cell by using different methods according to operational states of the vehicle, the operational states of the vehicle comprising the temporary stop state, the running state, and the stop state.