Secondary battery and method for manufacturing the same

A secondary battery comprising:

• an electrode assembly including a first electrode, a second electrode, and a separator;
• a pouch configured to have a bottom surface of a rectangle shape and lateral surfaces extending from edges of the bottom surface which form a cavity to accommodate the electrode assembly, the lateral surfaces having four planes and four corners formed by each two adjacent ones of the four planes of the lateral surfaces;
• at least one alignment indentation on at least one edge of the electrode assembly;
• and
• at least one alignment protrusion on at least one of the corners of the lateral surfaces of the pouch and protruding into the cavity,
• wherein the at least one alignment indentation is complementary to and aligning with the at least one alignment protrusion when the first electrode, the second electrode, and the separator are stacked with the cavity, such that the at least one alignment protrusion fits into the at least one alignment indentation.