Battery management system and driving method thereof

A battery management system coupled to a battery having a plurality of cells in a vehicle, the battery management system comprising:

• a sensing unit coupled to the battery, the sensing unit detecting a voltage of each cell of the battery;
• and
• a main control unit coupled to the sensing unit, the main control unit determining an operation state of the vehicle, the main control unit generating a first sampling signal when the operation state is a first state and generating a second sampling signal different from the first sampling signal when the operation state is a second state different from the first state, the first and second sampling signals being provided to the to the sensing unit to control a sampling speed in detecting the voltage of each cell.