Abstract: A jelly-roll battery cell includes a first electrode plate, a second electrode plate, and a separator, and includes a central region enclosed by the first electrode plate, the second electrode plate, and the separator, and has a thickness direction. The first electrode plate includes: a first current collector, where the first current collector includes a first surface and a second surface opposite to the first surface, and the first surface is closer to the central region than the second surface; a first section; and a second section, where a first tab is disposed on the first surface in the second section. The second electrode plate includes a second tab whose first side is on the second electrode plate. The first end, the first tab, and the second tab do not overlap in a thickness direction.

Abstract: A cell includes an electrode assembly. The electrode assembly includes: a first electrode plate including a first current collector, a first active substance layer provided on a surface of the first current collector, and a first uncoated foil area without the first active substance layer; a second electrode plate; and a separator disposed between the first electrode plate and the second electrode plate. The electrode assembly is formed by winding the first electrode plate, the separator, and the second electrode plate in sequence. In a winding direction of the electrode assembly, each layer from the second layer to the second outermost layer of the first electrode plate includes a first flat section, and a first bent section and a second bent section provided on two sides of the first flat section respectively.

Abstract: A jelly-roll battery cell includes a first electrode plate, a second electrode plate, and a separator, and includes a central region enclosed by the first electrode plate, the second electrode plate, and the separator, and has a thickness direction. The first electrode plate includes: a first current collector, where the first current collector includes a first surface and a second surface opposite to the first surface, and the first surface is closer to the central region than the second surface; a first section; and a second section, where a first tab is disposed on the first surface in the second section. The second electrode plate includes a second tab whose first side is on the second electrode plate. The first end, the first tab, and the second tab do not overlap in a thickness direction.