BATTERY PACK AND OPERATION METHOD THEREOF

A battery pack according to an embodiment of this document may include a conversion unit that converts a total voltage output from a first battery unit and a second battery unit into an intermediate voltage, a switch circuit unit that switches an electrical connection between the conversion unit and the first battery unit and a load, and a controller that controls an operation of the switch circuit unit to charge the first battery unit and supply power to the load using the intermediate voltage.