A cell module (3) is equipped with a unit cell (301) having a power generation element (115) containing an electrolyte and sealed within an exterior member (113, 114). The cell module (3) includes: a cell information management unit including an electric component for managing information about the unit cell (301); and a joining portion (6) for joining between the cell information management unit and a member constituting the cell module (3). In the cell module (3), the joining strength of the joining portion (6) is made larger than the yield stress of the cell information management unit. This makes it possible to enhance the reliability of the information stored in the cell information management unit when the cell module is reused.
