Battery, all-solid-state battery, battery module, and battery manufacturing method

An all-solid-state battery comprising:

• an electrode stack that is formed in a rectangular parallelepiped shape, and includes a positive electrode layer formed in a plate shape, a negative electrode layer facing the positive electrode layer in a thickness direction, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer;
• an outer package of a laminated film, the outer package including a folded portion on a longer side of the electrode stack and housing the electrode stack;
• and
• a holder that is disposed on a shorter side of the electrode stack and is connected to the folded portion.

A battery manufacturing method comprising:

• preparing an electrode stack formed in a rectangular parallelepiped shape, an outer package of a laminated film, the outer package including a folded portion on a longer side of the electrode stack and housing the electrode stack, a first holding member, and a second holding member including an opening capable of housing an end of the folded portion, the first holding member and the second holding member serving as a holder that is connected to the folded portion;
• housing the end of the folded portion of the outer package in the opening of the second holding member;
• and
• attaching the first holding member to the second holding member in a state where the end of the folded portion is housed.