Secondary battery and battery pack including the same

A secondary battery comprising:

• an electrode body that includes a positive electrode plate and a negative electrode plate;
• an outer body that has an opening and houses the electrode body;
• a sealing plate that is made of metal and seals the opening;
• and
• a terminal that is electrically connected to the positive electrode plate or the negative electrode plate,
• wherein the sealing plate has a terminal attachment hole,
• the terminal penetrates the terminal attachment hole,
• an external conductive member is connected to a portion of the terminal located on a battery outer side with respect to the sealing plate,
• a conduction path between the positive electrode plate or the negative electrode plate and the terminal is provided with at least one of a current interrupting mechanism and a fuse part,
• a first insulating member is disposed between the sealing plate and the terminal, and
• a second insulating member having higher thermal resistance than the first insulating member is disposed between the external conductive member and the sealing plate,
• wherein a hollow is formed on an upper surface of the sealing plate,
• and wherein at least a portion of the second insulating member is accommodated in the hollow.