Cell, battery and electronic device

A battery comprising a cell, wherein the cell comprises:

• a first electrode sheet comprising
• a first current collector and
• a first active material layer disposed on a surface of the first current collector;
• a second electrode sheet comprising
• a second current collector and
• a second active material layer disposed on a surface of the second current collector,
• wherein, the second current collector comprises a starting section and
• a first bending segment connected to the starting section;
• an electrolyte;
• and
• a separator disposed between the first electrode sheet and the second electrode sheet;
• wherein two surfaces of a starting end of the first current collector in a winding direction of the cell are provided with the first active material layer,
• a first electrode tab disposed on a surface of the first current collector;
• a second electrode tab disposed on a surface of the starting section of the second current collector;
• wherein the first current collector comprises a first current collector bending segment and a finishing section, the first current collector bending segment is connected to the finishing section, the finishing section is terminated at a tail cutting position, the finishing section is not bent and is not coated with the first active material layer, and the first electrode tab is disposed on a surface of the finishing section of the first current collector;
• and
• the separator comprises a wound structure, the wound structure comprising a separator starting section having a starting edge in an innermost layer of the wound structure, the separator starting section beginning at a location corresponding to an electrode tab of the first current collector or the second current collector, wherein a sum of a thickness of the first electrode tab and a thickness of the finishing section of the first current collector is h1, and a sum of a thickness of the second electrode tab and a thickness of the starting section of the second current collector is h2, an absolute value of a difference between h1 and h2 is greater than or equal to 0 μm, and less than or equal to 30 μm.

An electronic device, comprising:

• a housing;
• and
• a battery disposed in the housing comprising a cell,
• wherein the cell comprises:
• a first electrode sheet comprising
• a first current collector and
• a first active material layer disposed on a surface of the first current collector;
• a second electrode sheet comprising
• a second current collector and
• a second active material layer disposed on a surface of the second current collector,
• wherein, the second current collector comprises a starting section and
• a first bending segment connected to the starting section;
• an electrolyte;
• and
• a separator disposed between the first electrode sheet and the second electrode sheet, a first electrode tab disposed on a surface of the first current collector;
• a second electrode tab disposed on a surface of the starting section of the second current collector;
• wherein the first current collector comprises a first current collector bending segment and a finishing section, the first current collector bending segment is connected to the finishing section, the finishing section is terminated at a tail cutting position, the finishing section is not bent and is not coated with the first active material layer, and the first electrode tab is disposed on a surface of the finishing section of the first current collector;
• and the separator comprises a wound structure, the wound structure comprising a separator starting section having a starting edge in an innermost layer of the wound structure, the separator starting section beginning at a location corresponding to an electrode tab of the first current collector or the second current collector, wherein a sum of a thickness of the first electrode tab and a thickness of the finishing section of the first current collector is h1, and a sum of a thickness of the second electrode tab and a thickness of the starting section of the second current collector is h2, an absolute value of a difference between h1 and h2 is greater than or equal to 0 μm, and less than or equal to 30 μm;
• and
• wherein two surfaces of a starting end of the first current collector in a winding direction of the cell are provided with the first active material layer.