Energy storage device

An energy storage device including a case and an electrode assembly housed in the case, the energy storage device comprising:

• a current collector arranged between the electrode assembly and a wall of the case in a first direction;
• and
• an electrode terminal fixed to the wall,
• wherein the current collector includes:
• a terminal connecting portion connected to the electrode terminal;
• and
• an electrode connecting portion connected to the electrode assembly,
• wherein the terminal connecting portion and the electrode connecting portion are arranged side by side in a second direction intersecting with the first direction,
• wherein a thickness of the electrode connecting portion is smaller than a thickness of the terminal connecting portion,
• wherein the electrode assembly includes an electrode assembly body portion and a tab portion protruding from a part of the electrode assembly body portion in the first direction,
• wherein the electrode assembly includes a positive electrode plate and a negative electrode plate,
• wherein the tab portion is disposed between the electrode assembly body portion and the wall in the first direction,
• wherein the tab portion includes a plurality of tabs on the positive electrode plate and a plurality of tabs on the negative electrode plate, and
• wherein the plurality of tabs on the positive electrode plate and the plurality of tabs on the negative electrode plate protrude toward the wall.