Case and method for manufacturing the same, method for inserting stacked body, and cell stack

A cell stack comprising:

• a case including two opposed contact parts and two spring structures connecting the two opposed contact parts with each other;
• and
• a stacked body in which at least two all-solid-state battery cells are stacked, wherein
• the stacked body is inserted into the case and both ends of the stacked body in a stacking direction come into contact with the two opposed contact parts, respectively, and
• the two opposed contact parts are pressed in the stacking direction of the stacked body,
• wherein the case is made of fiber reinforced plastic,
• the two opposed contact parts and the two spring structures are integrally molded, and
• the two spring structures expand or contract when each of the battery cells expands or contracts, so that a pressure applied to the stacked body by the case is maintained within a range of 0.8 to 40 MPa.