Patent ID: 8463563

Claim:
A battery management system comprising: a sensing unit for measuring a cell voltage and a cell current of each of a plurality of battery cells; and a main control unit (MCU) for measuring a state of charge (SOC) of each of the battery cells to control charge and discharge by utilizing the cell voltage and the cell current of each of the battery cells, wherein the MCU comprises: an SOC measurement unit for measuring a first SOC of each of the battery cells in a key-off state, and measuring a second SOC of each of the battery cells in a key-on state after the key-off state; and a controller for comparing whether a first difference value between the first SOC and the second SOC of each of the battery cells is greater than a first reference value or comparing whether a second difference value between a maximum value among the second SOC of each of the battery cells and the second SOC of each of the battery cells is greater than a second reference value to determine a short battery cell in which the first difference value is greater than the first reference value or the second difference value is greater than the second reference value from among the battery cells, wherein when the first difference value for all the plurality of battery cells is less than the first reference value, the controller is configured to compare whether the second difference value for at least one of the plurality of battery cells is greater than the second reference value.