Secondary cell and method for manufacturing the same

A secondary cell comprising:

• an outer package;
• and
• an object housed in the outer package,
• wherein the object includes an electrode body having a positive electrode layer, an intermediate layer, and a negative electrode layer,
• wherein the intermediate layer is a solid-electrolyte layer being interposed between the positive electrode layer and the negative electrode layer,
• wherein the positive electrode layer, the intermediate layer, and the negative electrode layer are stacked in a stacking direction,
• wherein the positive electrode layer, the intermediate layer, and the negative electrode layer are made of powder materials,
• wherein the outer package has an obverse plate and a reverse plate opposed to the obverse plate,
• wherein the outer package has a plurality of pressing portions formed integrally with an internal surface of said at least one of the obverse plate and the reverse plate of the outer package for locally pressing at least one of an obverse side and a reverse side of the object to be housed, the outer package having a width direction and a depth direction perpendicular to the width direction, the width direction and the depth direction being perpendicular to the stacking direction, the plurality of pressing portions separately arranged along the width direction or the depth direction,
• wherein each of the obverse plate and the reverse plate has an inwardly curved shape in a state in which the object is not housed in the outer package and each of the obverse plate and the reverse plate assumes a flat shape in a state in which the object is housed in the outer package,
• wherein, in an initial assembled state of the secondary cell prior to a charging/discharging operation, the obverse plate and the reverse plate apply a pressing force to the object so as to reduce electrical contact resistance within the object, and
• wherein one of the plurality of pressing portions is disposed on a center of the outer package in the width direction and the depth direction.