Manufacturing method of assembled battery

A manufacturing method of an assembled battery including

• an assembled battery intermediate body including a plurality of cells and a storage body in which the cells are accommodated,
• a cover placed at a placement position on a first surface of the storage body so as to cover the first surface, the cover being plate-shaped, the placement position being predetermined, and
• at least three attachment bolts with which the cover is attached to the assembled battery intermediate body,
• the storage body including at least three fastening holes on a first surface side of the storage body, the cover being attached to the assembled battery intermediate body with the fastening holes, and a shape of the fastening holes each including a female screw fitting a male screw formed in a shaft portion of the attachment bolt,
• the cover including at least three bolt insertion portions each constituted by a through-hole or a notch portion,
• the bolt insertion portions being placed at positions facing the fastening holes of the storage body when the cover is placed at the placement position,
• the cover being fixed to the assembled battery intermediate body in a state where the shaft portion is passed through the bolt insertion portion and the male screw is engaged threadedly with the female screw,
• the manufacturing method comprising:
• attaching the cover to a placement jig configured to place the cover at the placement position such that a surface of the cover makes contact with a surface of a jig body portion included in the placement jig and having a flat-plate shape;
• placing the cover at the placement position by moving the placement jig to which the cover is attached such that the placement jig approaches the assembled battery intermediate body fixed on a pedestal in a state where the first surface faces the cover;
• and
• fastening and fixing the cover to the assembled battery intermediate body with the attachment bolts such that the shaft portion is passed through the bolt insertion portion of the cover placed at the placement position and the male screws of the attachment bolts are engaged threadedly with the female screws of the fastening holes facing the bolt insertion portions, wherein:
• the placement jig includes at least two positioning pins projecting from the surface of the jig body portion;
• when the cover is attached to the placement jig, the positioning pins are respectively passed through a first bolt insertion portion and a second bolt insertion portion as the bolt insertion portions, such that the cover is positioned with respect to the placement jig;
• in placing the cover, the positioning pins are placed at positions where the positioning pins are respectively inserted into a first fastening hole and a second fastening hole as the fastening holes when the cover attached to the placement jig is placed at the placement position;
• in attaching the cover, the positioning pins are respectively passed through the first bolt insertion portion and the second bolt insertion portion of the cover, such that the cover is attached to the placement jig;
• and
• in placing the cover, the positioning pins are respectively inserted into the first fastening hole and the second fastening hole such that the cover is placed at the placement position.