BATTERY PACK, BATTERY MODULE HAVING THE BATTERY PACK, POWER SUPPLY DEVICE HAVING THE BATTERY MODULE

A battery pack, a battery module including the battery pack, and a power supply device including the battery module. The battery pack includes: a type-1 battery cell; and a series of type-2 battery cells which have an output power and a capacity different from an output power and a capacity of the type-1 battery cell and are arranged along a circumference of the type-1 battery cell to surround the type-1 battery cell. The series of type-2 battery cells are connected in parallel to the type-1 battery cell. The battery pack is a high-power, high-capacity battery pack capable of instantaneously outputting high power without a decrease in lifespan for a long time.