Secondary battery and fabricating method therefor

A secondary battery, comprising:

• an electrode assembly;
• a current collector coupled to the electrode assembly;
• a case accommodating the electrode assembly and the current collector;
• a cap plate coupled to the case, the cap plate sealing the electrode assembly and the current collector in the case;
• and
• a terminal plate connected to the current collector, the terminal plate being exposed through the cap plate,
• wherein the current collector is welded to at least one of the electrode assembly and the terminal plate by both a dual beam welding and a wobble welding,
• wherein an interface between the current collector and the at least one of the electrode assembly and the terminal plate includes a first welding area having a circular shape and a second welding area having an annular shape spaced apart from and surrounding the circular shape, and
• wherein the interface between the current collector and the at least one of the electrode assembly and the terminal plate further includes a wobble welding area only on the second welding area among the first welding area and the second welding area.