Wound-type cell and winding mandrel

A wound-type cell, comprising:

• a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector, and the first electrode plate further having a blank first current collector which is positioned at a first winding start end and is not coated with the first active material layer;
• a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and the second electrode plate further having a blank second current collector which is positioned at a second winding start end and is not coated with the second active material layer, and the blank second current collector being positioned at an inner side of the blank first current collector in a thickness direction;
• a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate;
• a first electrode tab electrically connected to the blank first current collector;
• and
• a second electrode tab electrically connected to the blank second current collector;
• wherein
• a first end of the blank first current collector is beyond a second end of the blank second current collector in a length direction, and a position of the first electrode tab is beyond the second end of the blank second current collector in the length direction;
• at least a part of a third winding start end of the separator is folded back to an inner side in the thickness direction and is positioned between the first electrode tab and the second electrode tab in the length direction.