Method of manufacturing battery

A method of manufacturing a battery that includes:

• a flat wound electrode body including a first electrode, a second electrode having a polarity different from the first electrode, and a separator, the first electrode and the second electrode being wound via the separator;
• and
• a battery case housing the wound electrode body, wherein
• in the battery,
• multiple tabs connected to the first electrode are present at one end of the wound electrode body in the winding axis direction,
• the tabs are in connection with a first electrode collecting unit,
• the wound electrode body includes a first region on one side relative to a winding axis and a second region on the other side relative to the winding axis in the thickness direction of the wound electrode body,
• the tabs include a first tab, a second tab, a third tab, and a fourth tab,
• among the tabs present in the first region, the first tab is located at a position closest to the winding axis of the wound electrode body in the thickness direction of the wound electrode body,
• among the tabs present in the second region, the second tab is located at a position closest to the winding axis of the wound electrode body in the thickness direction of the wound electrode body,
• among the tabs present in the first region, the third tab is located at a position farthest from the winding axis of the wound electrode body in the thickness direction of the wound electrode body,
• among the tabs present in the second region, the fourth tab is located at a position farthest from the winding axis of the wound electrode body in the thickness direction of the wound electrode body, and
• at the one end,
• a distance between a middle of a base width of the first tab and a middle of a base width of the second tab in a perpendicular direction to the thickness direction is G1, and
• a distance between a middle of a base width of the third tab and a middle of a base width of the fourth tab in the perpendicular direction is G2, the method comprising:
• producing the wound electrode body;
• and
• arranging, in the battery case, the wound electrode body produced, wherein
• when producing the wound electrode body, under a winding condition where G2 satisfies G2=S (S>0), when the wound electrode body is produced to satisfy G1=0, a value of G1 is changed such that G2 satisfies G2<S;
• the producing of the wound electrode body comprises:
• winding the separator, the first electrode, and the second electrode around a winding core to produce a wound body, and
• molding the wound body into a flat shape, and
• cutting a first electrode base plate before winding the first electrode around the winding core to form a winding beginning end of the first electrode, wherein
• in the cutting, a position at which the first electrode base plate is cut is controlled to change the value of G1.