Secondary battery having cathode terminal-integrated cap plate

A secondary battery comprising:

• a case;
• an electrode assembly received in the case;
• and
• a cap plate coupled to the case so as to protect the electrode assembly,
• wherein the cap plate includes a terminal part to which the electrode assembly is electrically connected and which is formed integrally with the cap plate, and the terminal part is thicker than the cap plate, and
• wherein the terminal part includes:
• a support region upwardly extending from the cap plate and having a smaller thickness than the cap plate;
• and
• a terminal region vertically extending from the support region, and
• the cap plate has a thickness ranging from 1.5 mm to 2.5 mm, the support region has a thickness ranging from 0.5 mm to 1 mm, and the terminal region has a thickness ranging from 2.5 mm to 3.5 mm.