Battery case and secondary battery including same

A secondary battery comprising:

• an electrode assembly comprising a first electrode comprising a first electrode tab, a second electrode comprising a second electrode tab, and a separator;
• a case comprising one opened surface configured to accommodate the electrode assembly;
• and
• a cover covering the one opened surface of the case and sealing the electrode assembly in the case,
• wherein the case comprises:
• a case body comprising a through-hole in a first wall;
• a first insulating member on an inner surface of the first wall;
• a terminal plate on the first insulating member and connected to the first electrode tab;
• a rivet terminal penetrating the through-hole of the case body, the first insulating member, and the terminal plate;
• and
• an electrode terminal connected to the rivet terminal on an outer surface of the first wall, and
• wherein the first insulating member comprises:
• a horizontal portion on the inner surface of the first wall;
• and
• a first extension portion extending from one side of the horizontal portion.