Energy storage device

An energy storage device comprising:

• a housing configured to accommodate an electrolyte;
• an electrode element accommodated in the housing;
• a case coupled to one side of the housing;
• and
• an electrode terminal inserted into the case and electrically connected to the electrode element,
• wherein:
• the case includes:
• a base part in which a through-hole is formed, the through-hole being configured to allow the electrode terminal to be inserted thereinto;
• and a sealing part coupled to the base part, the sealing part being configured to seal a gap between the base part and the electrode terminal,
• the housing includes a curling member hooked on and supported by the sealing part,
• the sealing part includes a terminal sealing member positioned in the through-hole and pressed against the electrode terminal to seal the gap between the base part and the electrode terminal, an upper surface sealing member positioned on an upper surface of the base part, and a sealing protrusion protruding upward from the upper surface sealing member,
• the sealing protrusion is inserted into the curling member and supports the curling member by catching, and
• an inner surface of the curling member directly contacts the sealing protrusion.