A wound cell, the wound cell comprises: a first electrode sheet comprising a first current collector, a first active material layer and a first diaphragm, the first current collector comprising a first end portion, and two sides of the first end portion being provided with the first active material layer, the first diaphragm being provided to a head and a tail of the first active material layer; a first electrode tab electrically connected with the first current collector; a second electrode sheet comprising a second current collector, a second active material layer, a second diaphragm and a first diaphragm adhesive, the second active material layer being located on a surface of the second current collector; the second diaphragm being provided to a head and a tail of the second active material layer, the first diaphragm adhesive being provided on the second diaphragm, wherein the first end portion is between a tail end of the second active material layer and a tail end of the first active material layer, wherein the second current collector comprises a first abutting segment adjacent to the first end portion, and in the thickness direction of the wound cell, the first abutting segment does not overlap with the first end portion, a second electrode tab electrically connected with the second current collector; a separator located between the first electrode sheet and the second electrode sheet, and a first bending section, wherein the first abutting segment is located between the first bending section and the first end portion, characterized in that in the thickness direction of the wound cell, the wound cell has a thickness t at the first end portion, a thickness T at the first electrode tab or the second electrode tab and a thickness ta at the first abutting segment, the thickness t at the first end portion being composed of a thickness of a plurality of layers of the first electrode sheets, a thickness of a plurality of layers of the second electrode sheets, a thickness of a plurality of layers of the separators, and a thickness of the first diaphragm adhesive, wherein an absolute value of a difference between t and T is smaller than or equal to 50 μm, and an absolute value of a difference between ta and T is smaller than or equal to 150 μm, and in the width direction of the wound cell, the first end portion has a width being one third of a width of the first electrode tab, the first diaphragm adhesive is an adhesive tape with a gradient change in thickness, so that t being greater than or equal to 95% T. a first electrode sheet comprising a first current collector, a first active material layer and a first diaphragm, the first current collector comprising a first end portion, and two sides of the first end portion being provided with the first active material layer, the first diaphragm being provided to a head and a tail of the first active material layer; a first electrode tab electrically connected with the first current collector; a second electrode sheet comprising a second current collector, a second active material layer, a second diaphragm and a first diaphragm adhesive, the second active material layer being located on a surface of the second current collector; the second diaphragm being provided to a head and a tail of the second active material layer, the first diaphragm adhesive being provided on the second diaphragm, wherein the first end portion is between a tail end of the second active material layer and a tail end of the first active material layer, wherein the second current collector comprises a first abutting segment adjacent to the first end portion, and in the thickness direction of the wound cell, the first abutting segment does not overlap with the first end portion, the second active material layer being located on a surface of the second current collector; the second diaphragm being provided to a head and a tail of the second active material layer, the first diaphragm adhesive being provided on the second diaphragm, wherein the first end portion is between a tail end of the second active material layer and a tail end of the first active material layer, wherein the second current collector comprises a first abutting segment adjacent to the first end portion, and in the thickness direction of the wound cell, the first abutting segment does not overlap with the first end portion, a second electrode tab electrically connected with the second current collector; a separator located between the first electrode sheet and the second electrode sheet, and a first bending section, wherein the first abutting segment is located between the first bending section and the first end portion, characterized in that in the thickness direction of the wound cell, the wound cell has a thickness t at the first end portion, a thickness T at the first electrode tab or the second electrode tab and a thickness ta at the first abutting segment, the thickness t at the first end portion being composed of a thickness of a plurality of layers of the first electrode sheets, a thickness of a plurality of layers of the second electrode sheets, a thickness of a plurality of layers of the separators, and a thickness of the first diaphragm adhesive, wherein an absolute value of a difference between t and T is smaller than or equal to 50 μm, and an absolute value of a difference between ta and T is smaller than or equal to 150 μm, and in the width direction of the wound cell, the first end portion has a width being one third of a width of the first electrode tab, the first diaphragm adhesive is an adhesive tape with a gradient change in thickness, so that t being greater than or equal to 95% T.