US Patent 9484763 Battery pack and method of controlling the same

A battery pack and a method of controlling the same. The battery pack includes: a first battery module that includes at least one battery cell; a second battery module that includes at least one battery cell electrically connected to the first battery module; a charge/discharge control unit that breaks or connects a charge/discharge path of each of the first battery module and the second battery module; a first battery management unit that controls the first battery module; and a second battery management unit that generates a signal for controlling switches included in the charge/discharge control unit by referring to a state of the second battery module, wherein the first battery management unit and the second battery management unit are connected in parallel to the charge/discharge control unit.