Battery

A battery comprising:

• an electrode body that has a winding structure, the electrode body including:
• a positive electrode that includes a positive electrode lead, and has a belt shape;
• a negative electrode that includes a negative electrode lead, and has the belt shape;
• and
• a separator that is provided between the positive electrode and the negative electrode, and has the belt shape;
• and
• an electrolyte solution, the electrode body and the electrolyte solution being accommodated in a case, wherein
• the positive electrode lead and the negative electrode lead are led out from a first end face of the electrode body,
• the electrode body includes a molded part of the separator, the molded part protruding from a second end face, and
• the electrode body satisfies Formula 1 and Formula 2:
• 0.08≤W2/Ws≤0.17;
• and (Formula 1)
• 0.20≤W4/W2≤0.53, (Formula 2)
• wherein W2 is the amount of protrusion from the negative electrode of the separator on a side of the second end face, Ws is a width of the separator, and W4 is a size of the molded part from an end of the negative electrode to a bottom part excluding a thickness of a tape of the electrode body,
• wherein the molded part is formed by the separator that has been compressed in the winding axis direction,
• wherein compressing the separator is performed by applying a pressure in the winding axis direction from the second end face side towards the first end face side, and
• wherein the separator is bent in different directions about a center of the electrode body, including a first bend in which the separator bends towards the center of the electrode body and a second bend in which the separator bends away from the center of the electrode body in a longitudinal direction of the electrode body, the first bend changes a radial direction of the separator to extend in a first radial direction towards the center of the electrode body, and the second bend changes the radial direction of the separator to extend in a second radial direction opposite the first radial direction away from the center of the electrode body.