Patent ID: 7675263

Claim:
A method for controlling a battery pack including a switching element that turns from OFF to ON if the battery pack with a rechargeable battery is in an abnormal state, a heat resistor that is connected to the switching element and the rechargeable battery in series, and through which current flows when the switching element turns to ON, and a fuse that is located in a position where the fuse is heated by the heat resistor through which the current flows and is connected to the rechargeable battery in series so that the fuse is disconnected with heat by the heat resistor at high temperature when the current flows to cut off a current flow in the rechargeable battery, the method comprising: determining whether the battery pack is in an abnormal state; detecting whether the capacity or voltage of the rechargeable battery is less than a preset capacity or voltage value if it is determined that the battery pack is in an abnormal state; and disconnecting the fuse with heat by turning the switching element to ON after the rechargeable battery is charged if it is detected that the battery pack is in an abnormal state and the capacity or voltage of the rechargeable battery is less than the preset capacity or voltage value.