Rolled-tye battery

A wound battery comprising:

• a generator element, and
• a battery case accommodating the generator element, the generator element including a first electrode, a second electrode having a different polarity from the first electrode, a separator disposed between the first electrode and the second electrode, and an electrolyte, the first electrode and the second electrode being wound together via the separator to form an electrode assembly,
• the battery case including a bottomed tube-shaped metallic can and a sealing member that seals an open end of the metallic can,
• the first electrode including a first current collector sheet and a first active material layer disposed on a surface of the first current collector sheet, the first electrode having a first uncoated region defined by an exposed portion of the first current collector sheet at an end of the first current collector sheet in the axial direction of winding, the first electrode including a first current collector lead connected to the first uncoated region, the first uncoated region being disposed closer to the open end of the metallic can than the first active material layer in the battery case in the axial direction of winding,
• the second electrode including a second current collector sheet and a second active material layer disposed on a surface of the second current collector sheet, the second electrode including a second current collector lead connected thereto,
• the first current collector lead and the second current collector lead each extending toward the open end of the metallic can,
• at least a portion of the first uncoated region being covered with an insulating layer which is longer in a direction perpendicular to the axial direction of winding than in the axial direction of winding,
• the insulating layer extending beyond an end face of the first uncoated region, and
• the insulating layer is separated from the first active material layer.