Secondary battery, electronic device, and power tool

A secondary battery comprising:

• an electrode wound body including a first electrode, a second electrode, and a separator interposed therebetween, and having a first end and a second end, the first electrode including a first electrode foil and a first electrode active material layer covering a part of the first electrode foil, the second electrode including a second electrode foil and a second electrode active material layer covering a part of the second electrode foil;
• a first electrode current collector plate connected to the first end;
• and
• a second electrode current collector plate connected to the second end,
• wherein
• the first electrode includes a first electrode covered part in which the first electrode foil is covered with the first electrode active material layer, and a first electrode exposed part exposed from the first electrode active material layer,
• the first electrode exposed part is bent and includes first electrode-foil adjacent portions at the first end, and a portion of the first electrode covered part is bent adjacent to the first electrode exposed part.