Battery pack

An embodiment of the present invention relates to a battery pack (100) including a plurality of bare cells (10), each having a cap assembly, a bottom positioned opposite to the cap assembly, and a side connecting the cap assembly and the bottom; a protection circuit module mounted on the bare cells; a cover frame (200) covering the bare cells, preferably composed of a first frame (210) and two second frames (220a, 220b); and an enclosure member (400) covering the bare cells.