| abstract |
A cell comprising a positive electrode, a negative electrode, a substantially columnar wound electrode body having a separator, and a flexible outer casing wrapping around the wound electrode body, such that the positive electrode, the negative electrode, and/or a positive or negative electrode body comprises at least one protruding section that projects in the outer peripheral direction in at least one winding inward from the outermost periphery of the windings of the wound electrode body. |