Patent ID: 8828586

Claim:
A rechargeable battery pack comprising: a first unit cell including a first end and a second end opposite the first end; a second unit cell including a first end and a second end opposite the first end, the second end having a plurality of openings, the second unit cell being coupled to the first unit cell in an axial direction extending between the first ends; and a connection tab coupled to the first end of the first unit cell and the second end of the second unit cell and electrically connecting the first and second unit cells to each other in series or parallel, the connection tab comprising: a protrusion extending away from the first end of the first unit cell; and a guide portion extending from a side of the protrusion in a circumferential direction relative to the axial direction, the guide portion being received in an opening of the plurality of openings, wherein the guide portion has a length extending beyond the side of the protrusion in the circumferential direction.