A nonaqueous electrolyte secondary battery including a battery case that is not corroded easily even at the time of over-discharging is provided. Unlike the previously known prior art, where changes to the internal geometry of the pump stator caused by wear were always remedied with radially acting clamping measures, the invention is based on bringing this about by a change in the length of the lining. The amount of movement of a door is automatically limited at a preselected position.