Power storage module

A power storage module, comprising:

• a stacked body including a plurality of electrodes stacked along a first direction;
• a sealing body including a first sealing portion joined to an edge portion of each of the electrodes, and forming an inner space between the electrodes adjacent to each other and sealing the inner space;
• and
• an electrolytic solution being stored in the inner space and including an alkali solution,
• wherein the electrodes include a plurality of bipolar electrodes, and a negative terminal electrode,
• the bipolar electrodes include an electrode plate including a first surface and a second surface opposite to the first surface, a positive electrode provided on the first surface, and a negative electrode provided on the second surface,
• the negative terminal electrode includes an electrode plate including a third surface and a fourth surface opposite to the third surface, and a negative electrode provided on the fourth surface, and is disposed at one end of the stacked body in the first direction so that the fourth surface of the electrode plate of the negative terminal electrode faces the first surface of the electrode plate of the bipolar electrode,
• a surplus space different from the inner space is provided on a route in which the electrolytic solution reaches an outside of the power storage module from the inner space through the negative terminal electrode,
• the stacked body includes a metal plate disposed on an outer side in the first direction with respect to the electrode plate of the negative terminal electrode, wherein an inner surface of the metal plate faces the third surface of the electrode plate of the negative terminal electrode, and wherein an outer surface of the metal plate is opposite from the inner surface of the metal plate,
• wherein the first sealing portion includes a second resin portion having an annular shape, the second resin portion being disposed at a peripheral edge portion of the outer surface of the metal plate so that a central region of the outer surface of the metal plate is not covered by the second resin portion, and the metal plate is welded to the second resin portion of the first sealing portion, and
• the surplus space is formed by the first sealing portion, the electrode plate of the negative terminal electrode, and the metal plate, and has air-tightness with respect to the outside of the power storage module.