Electricity storage device

An electricity storage device comprising:

• a casing configured to accommodate electrolyte and an electrode assembly including a positive electrode and a negative electrode;
• a terminal configured to extend from inside to outside of the casing through an opening provided on a terminal wall of the casing;
• and
• a current interruption device accommodated within the casing, electrically connected to the terminal and one of the positive electrode and the negative electrode, and comprising a conductive member configured to switch the terminal and the one of the positive electrode and the negative electrode from a conductive state to a non-conductive state,
• wherein
• the terminal comprises a column part inserted in the opening and a base part arranged on one end of the column part and disposed within the casing,
• the base part is larger than the opening in a plan view of the terminal wall and is electrically connected to the conductive member,
• a first sealing member having an insulating property and comprising a first sealing part sealing between the terminal and the terminal wall by being in contact with both of the terminal and the terminal wall is disposed between the terminal and the terminal wall,
• the first sealing member surrounds an entire periphery of the column part,
• a first insulating member having an insulating property is disposed within a first space provided between the terminal and the terminal wall on a casing inner side relative to the first sealing part, and surrounds the entire periphery of the column part,
• the first space extends from on a casing inner side end of the first sealing part to a casing inner side end of the base part,
• at least one of the first sealing member and the first insulating member is disposed in the first space from an end face of the first space on a casing outer side to an end face of the first space on the casing inner side,
• the first sealing member comprises a second sealing part sealing between the first insulating member and one of the terminal wall and the terminal by being in contact with both of the first insulating member and the one of the terminal wall and the terminal in a space where the first insulating member and the one of the terminal wall and the terminal face each other in a first direction viewed in the plan view of the terminal wall,
• a first protrusion is provided on at least one of the first insulating member, the terminal wall and the terminal in a range where the second sealing part is present, and projects toward a side of the first sealing member in the first direction,
• the first protrusion is in contact with the first sealing member.