POSITIVE ELECTRODE PLATE, ELECTRODE ASSEMBLY, BATTERY CELL, BATTERY, AND ELECTRICAL DEVICE

Embodiments of the present application provide a positive electrode sheet, an electrode assembly, a battery cell, a battery, and an electrical device. The positive electrode sheet is configured with a straight portion and to-be-bent portions; a thickening layer is disposed on at least one side of a positive electrode current collector of at least some of the to-be-bent portions, the thickening layer is disposed between the positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer covering a surface of the thickening layer is a first positive electrode active material layer, and the positive electrode active material layer located in the straight portion is a second positive electrode active material layer; and a ratio of a thickness of the first positive electrode active material layer to a thickness of the second positive electrode active material layer is 20-80%. Because the thickening layer is disposed on at least one side of the positive electrode current collector of the to-be-bent portions, when the surface of the positive electrode current collector is coated with a positive electrode active material, the coating mass of the positive electrode active material coated on the surface of the thickening layer is reduced, thereby ensuring that the capacity of the positive electrode active material in this region is less than that of a corresponding negative electrode active material, then reducing or avoiding the occurrence of lithium precipitation, and improving the safety of the battery.