BATTERY PACK

A battery pack including at least one battery cell including a first surface and a second surface forming opposite ends along a height direction thereof, and an outer circumferential surface connecting the first surface and the second surface; and a flexible circuit board configured to obtain state information of the at least one battery cell, the flexible circuit board including a corrugated main body at least partially surrounding the outer circumferential surface of the at least one battery cell, and branch portions extending from the main body onto the first surface or the second surface of the at least one battery cell.