Arc welding device for secondary battery, and welding method using the same

An arc welding device for a secondary battery, the arc welding device comprising:

• an upper fixing portion, the upper fixing portion including a plurality of welding electrode units, the plurality of welding electrode units being connected to a first pole of a welding power;
• and
• a lower fixing portion disposed to face the upper fixing portion, wherein the lower facing portion is connected to a second pole of the welding power, wherein an object to be welded is configured to be disposed between the upper fixing portion and the lower fixing portion;
• wherein the upper fixing portion includes a first facing surface, the first facing surface being concave and the first facing surface being configured to face the object to be welded, and
• wherein the lower fixing portion includes a second facing surface, the second facing surface being convex, the convex second facing surface being configured to correspond to the concave shape of the first facing surface and the second facing surface being configured to face the first facing surface.