Power storage cell

A power storage cell comprising:

• an electrode assembly;
• a cell case that accommodates the electrode assembly;
• and
• an external terminal fixed to an upper surface of the cell case, wherein
• the cell case has
• a case main body that accommodates the electrode assembly, the case main body being provided with an opening that opens upward, and
• a lid connected to the case main body so as to close the opening of the case main body,
• the lid has
• a lid main body connected to the opening of the case main body and charged positively or negatively in the electrode assembly,
• an inversion plate connected to the lid main body, the inversion plate being able to short-circuit the lid main body and the external terminal, and
• a protrusion protruding from the inversion plate toward the external terminal,
• the inversion plate is deformable between a steady-state shape and an inversion shape, the steady-state shape being a shape curved to project in a direction away from the external terminal, the inversion shape being a shape curved to project toward the external terminal with the inversion plate being in contact with the external terminal, and
• the external terminal has a holding portion that is separated from the protrusion when the inversion plate is in the steady-state shape and that holds the protrusion when the inversion plate is in the inversion shape.