SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

The present disclosure provides a secondary battery, which has a battery can and a vent portion formed at a welding portion of a sealing member that seals the battery can, and thus there is no need to form a hole or apply a separate part to make the vent portion, thereby easily manufacturing the secondary battery, and a method of manufacturing the same, which enables the manufacturing of a secondary battery with a safer structure because the vent trigger pressure is accurately designed by controlling the welding strength of the welding portion. The secondary battery includes a battery can that provides a space for accommodating an electrode assembly and opens toward the outside of the secondary battery, the electrode assembly accommodated in the battery can, and a cap assembly including a cap plate coupled to an upper end portion of the battery can by welding to seal the battery can, wherein a welding portion that couples the battery can to the cap plate includes a first welding portion and a second welding portion that provide different bonding forces.