Battery and manufacturing method therefor

A method for manufacturing a battery, comprising:

• (a) providing an exterior body having an electrode body housed therein;
• the exterior body having a shape other than a substantially rectangular parallelepiped or cuboidal shape, and at least first, second and third inner surfaces with the first and third inner surfaces being located on opposite sides of the second inner surface and the second inner surfaces being larger in area than the first and third inner surfaces;
• the electrode body comprising a positive electrode, a negative electrode and a separator disposed between the positive and negative electrodes, the positive electrode, the negative electrode and the separator being stacked one on top of the other in a stacking direction;
• the electrode body having an outer periphery, each of the first, second and third inner surfaces facing and being spaced from a respective first, second and third section of the outer periphery of the electrode body by a respective gap so as define first, second and third regions, respectively, each of the first, second and third regions having a respective volume, the volume the second region being larger than the volumes of the first and third regions and being capable of temporarily holding a volume of the electrolytic solution injected into the second region via a liquid injection port extending through the second inner surface;
• (b) injecting the electrolytic solution into the second region via the liquid injection port;
• (c) stopping the injection of the electrolytic solution into the second region and allowing at least part of the injected electrolytic solution to permeate inside of the electrode body;
• and
• (d) repeating the steps (b) and (c) until the electrolytic solution penetrates into the entire inside of the electrode body.