Secondary battery including short circuit member comprising duct part and deformable part

A secondary battery comprising:

• an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode;
• a first collector plate connected to the first electrode;
• a second collector plate connected to the second electrode;
• a case accommodating the electrode assembly, the first collector plate, and the second collector plate;
• a cap plate sealing an opening of the case;
• a first electrode terminal electrically connected to the first collector plate and passing through the cap plate;
• a second electrode terminal electrically connected to the second collector plate and passing through the cap plate;
• and
• a short-circuit member electrically connected to the first collector plate and passing through the cap plate, the short-circuit member comprising:
• a duct part in communication with an inside of the case;
• and
• a deformable part covering a top portion of the duct part and being deformable by a gas pressure inside the case to electrically connect the first electrode to the second electrode,
• wherein the cap plate is electrically insulated from the first electrode terminal, the second electrode terminal, and the short-circuit member.