Secondary battery and battery pack

A secondary battery comprising:

• a first electrode current collector plate;
• a second electrode current collector plate;
• an electrode wound body disposed between the first electrode current collector plate and the second electrode current collector plate and having a through hole extending in a height direction, the electrode wound body including a stacked body that includes a first electrode, a second electrode, and a separator and is wound;
• a first electrode terminal coupled to the first electrode via the first electrode current collector plate;
• and
• a second electrode terminal coupled to the second electrode via the second electrode current collector plate, wherein
• the electrode wound body includes a first end face and a second end face, the first end face facing the first electrode current collector plate in the height direction, the second end face facing the second electrode current collector plate in the height direction,
• the first electrode includes a first electrode current collector and a first electrode active material layer, the first electrode active material layer covering a portion of the first electrode current collector,
• the first electrode includes a first electrode covered region in which the first electrode current collector is covered with the first electrode active material layer, and a first electrode exposed region in which the first electrode current collector is exposed without being covered with the first electrode active material layer,
• at least a portion of the first electrode exposed region forms the first end face and is coupled to the first electrode current collector plate,
• the second electrode includes a second electrode current collector and a second electrode active material layer, the second electrode active material layer covering a portion of the second electrode current collector,
• the second electrode includes a second electrode covered region in which the second electrode current collector is covered with the second electrode active material layer, and a second electrode exposed region in which the second electrode current collector is exposed without being covered with the second electrode active material layer,
• at least a portion of the second electrode exposed region forms the second end face and is coupled to the second electrode current collector plate,
• the second electrode current collector plate includes a facing part and a band-shaped part, the facing part facing and being coupled to the second end face, the band-shaped part being coupled to the facing part and extending in a first direction,
• the band-shaped part includes a projection region in which multiple projections are provided, and a flat region having a higher flatness than the projection region, and
• the flat region is positioned at a leading end part, of the band-shaped part, on an opposite side of the projection region to the facing part.