All-solid-state battery and method for producing the same

A method for producing an all-solid-state battery, the all-solid-state battery comprising:

• an electrode laminate in which a plurality of layers extending in a predetermined X direction and a predetermined Y direction orthogonal to the X direction are laminated in a Z direction orthogonal to the X direction and the Y direction;
• and an outer casing film,
• the outer casing film comprising a housing portion that houses the electrode laminate therein, and a sealing portion that is provided around the housing portion when viewed in the Z direction,
• an inside of the outer casing film being at a reduced pressure compared to an outside thereof,
• the electrode laminate comprising, as the layers, at least a positive electrode layer, a solid electrolyte layer, and a negative electrode layer,
• each of the positive electrode layer and the negative electrode layer comprising a current collector,
• the current collector being electrically connected to a tab lead that passes through the sealing portion in the X direction and that extends to the outside of the outer casing film,
• in a pre-pressure reduction stage before the inside of the outer casing film is brought to the reduced pressure,
• the outer casing film comprising an intermediate portion between the housing portion and a portion of the sealing portion welded to the tab lead,
• the intermediate portion having an intermediate portion proximal end as an end on a housing portion side and an intermediate portion distal end as an end on a sealing portion side, and
• the intermediate portion proximal end being provided in a central region of three regions defined by division, in the Z direction, of a region from an end of the outer casing film in the Z direction to the tab lead into three equal regions,
• the method comprising reducing pressure of the inside of the outer casing film from a state of the pre-pressure reduction stage.