Secondary battery and method for manufacturing the same

A method for manufacturing a secondary battery, the method comprising:

• an electrode assembly preparation step of preparing an electrode assembly which has a structure, in which electrodes and separators are alternately disposed, and on which flat top and bottom surfaces are formed;
• a first pressing step of pressing the top and bottom surfaces of the electrode assembly by using a first pressing device, on which a curved surface is formed, to form a curved surface, which has a shape corresponding to that of the curved surface formed on the first pressing device, on each of the top and bottom surfaces of the electrode assembly;
• an accommodation step of accommodating the electrode assembly, on which the curved surfaces on the top and bottom surfaces of the electrode assembly are formed, in a pouch type exterior in which a cup having a concave shape is formed;
• and
• a second pressing step of pressing the curved surfaces of the top and bottom surfaces of the electrode assembly and an outer surface of the pouch type exterior by using a second pressing device on which a curved surface is formed.