Secondary battery and battery pack

A battery pack comprising:

• a secondary battery;
• a processor configured to control the secondary battery;
• and
• an outer package body containing the secondary battery,
• the secondary battery including
• an electrode wound body including a stacked body and having a through hole, the stacked body including a positive electrode, a negative electrode, and a separator and being wound along a longitudinal direction of the stacked body, the through hole extending through the electrode wound body in a width direction intersecting the longitudinal direction, and
• an outer package can containing the electrode wound body, wherein
• the positive electrode includes
• a positive electrode current collector, and
• a positive electrode active material layer stacked on the positive electrode current collector and including a positive electrode active material,
• the positive electrode active material layer includes a thin part and a thick part, the thick part having a thickness greater than a thickness of the thin part and being positioned on a winding outer periphery side of the electrode wound body relative to the thin part in the longitudinal direction, and
• a position of a border between the thin part and the thick part is different, in a radial direction of the electrode wound body, from a position overlapping a position of a winding center side edge of the positive electrode, the winding center side edge being an edge of the positive electrode on a winding center side of the electrode wound body in the longitudinal direction.