A method for manufacturing a battery including a laminated electrode body in which a plurality of rectangular positive electrode plates and a plurality of rectangular negative electrode plates are alternately laminated with rectangular separators therebetween, the method comprising:
- a strip-shaped laminated body production step of producing a pressed strip-shaped laminated body formed by placing the plurality of rectangular positive electrode plates on a strip-shaped negative electrode body having a strip-shaped negative electrode plate disposed between a pair of strip-shaped separators at a predetermined interval so as to be spaced apart from each other by a gap in a longitudinal direction of the strip-shaped negative electrode body, and by roller-pressing the positive electrode plates and the strip-shaped negative electrode body;
- a cutting step of cutting the pressed strip-shaped laminated body to obtain rectangular plate-shaped unit laminated bodies in each of which a positive electrode plate of the plurality of rectangular positive electrode plates, a first separator of the rectangular separators, a negative electrode plate of the plurality of rectangular negative electrode plates, and a second separator of the rectangular separators are laminated in this order;
- a laminating step of laminating the unit laminated bodies on each other to form the laminated electrode body, and
- an assembly step of assembling the battery by using the laminated electrode body;
- wherein
- the strip-shaped laminated body production step comprises a pressing step of, in a state where a strip-shaped metal plate extending in a conveyance direction is disposed on one of the positive electrode plates disposed on the strip-shaped negative electrode body, roller-pressing the strip-shaped metal plate, the one positive electrode plate, and the strip-shaped negative electrode body by passing the strip-shaped metal plate, the one positive electrode plate, and the strip-shaped negative electrode body through a roller gap between a first press roller and a second press roller disposed parallel to the first press roller, to form the pressed strip-shaped laminated body;
- the endless strip-shaped metal plate has a circumferential length that is an integer multiple of the predetermined interval,
- the endless strip-shaped metal plate has a joined portion at which both end portions of the strip-shaped metal plate are joined to each other,
- the pressing step is performed while a non-joined portion of the endless strip-shaped metal plate other than the joined portion is placed on a first outer ridge portion of the positive electrode plate formed by a first positive electrode plate principal surface exposed to an outside and a first positive electrode plate end surface facing a downstream side in the conveyance direction, and a second outer ridge portion of the positive electrode plate formed by the first positive electrode plate principal surface and a second positive electrode plate end surface facing an upstream side in the conveyance direction;
- the strip-shaped metal plate is an annular endless strip-shaped metal plate, and
- the pressing step is performed while the endless strip-shaped metal plate is repeatedly placed on the positive electrode plate placed on the strip-shaped negative electrode body.