Case for secondary battery, secondary battery comprising case, and method for manufacturing secondary battery

A secondary battery comprising;

• an electrode assembly comprising a first electrode, a second electrode, and a separator, the separator disposed between the first electrode and the second electrode;
• and
• a battery case accommodating the electrode assembly,
• wherein the battery case comprises:
• a first body having at least one recess accommodating the electrode assembly;
• and
• a second body bonded to the first body forming a cover of the battery case,
• wherein the first body comprises a first cover layer and the second body comprises a second cover layer,
• wherein the first cover layer faces the second body and the second cover layer faces the first body,
• wherein a wing part of the first cover layer and a wing part of the second cover layer are bonded to each other, and
• wherein a portion of the wing part of the first cover layer and a portion of the wing part of the second cover layer form a photonic sintering area.

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

• preparing a first body having at least one recess accommodating an electrode assembly and providing a second body sharing at least one edge with the first body;
• disposing a first cover layer to face the second body and disposing a second cover layer to face the first body so that the first cover layer and the second cover layer are in contact with each other;
• and
• performing photonic sintering on the first body and the second body so that a wing part of the first cover layer and a wing part of the second cover layer are bonded to each other.