A rechargeable battery, comprising:
- an electrode assembly that performs charging and discharging operations;
- a case having the electrode assembly enclosed therein, the case including an opening at one end, a bottom facing the opening, the bottom having a quadrangular shape and rounded corners, a pair of wide walls between the bottom and the opening, the pair of wide walls facing each other, and a pair of narrow walls facing each other and connecting the pair of wide walls, wherein, an end of an uncoated region of the electrode assembly faces towards a narrow wall of the pair of narrow walls;
- a cap plate coupled with the opening of the case;
- an electrode terminal on the cap plate;
- and
- a current collecting member connecting the electrode assembly to the electrode terminal,
- wherein the current collecting member includes:
- a terminal connecting part connected to the electrode terminal, and
- an electrode connecting part connected to the uncoated region of the electrode assembly, the electrode connecting part including:
- an integrating part that is bent toward the bottom of the case from the terminal connecting part to face the narrow wall, and
- a welding part that is welded to the uncoated region, the welding part including:
- a first welding part extending from a lateral side of the integrating part and welded to a first part of the uncoated region of the electrode assembly, the first welding part facing a wide wall of the battery case,
- a second welding part extending from the first welding part toward the bottom of the case and welded to a second part of the uncoated region of the electrode assembly, the second welding part being progressively twisted according to a direction toward the bottom of the case from being perpendicular to the narrow wall to being at a predetermined non-perpendicular inclination angle to the narrow wall, and
- a third welding part extending from the second welding part toward the bottom of the case and welded to a third part of the uncoated region of the electrode assembly, the third welding part being at the predetermined non-perpendicular inclination angle to the narrow wall.