CURRENT COLLECTOR, ELECTRODE SHEET, ELECTRODE ASSEMBLY, BATTERY CELL, BATTERY AND ELECTRIC APPARATUS

This application provides a battery cell, a battery, and an electric device. The battery cell is of a cylindrical structure, the battery cell includes a wound electrode assembly, an electrode plate of the electrode assembly includes a current collector, and the current collector includes a support layer and a conductive layer. In a thickness direction of the current collector, the conductive layer is disposed on at least one side of the support layer, and elongation of the support layer is greater than elongation of the conductive layer. In the thickness direction of the current collector, the support layer has a thickness greater than a total thickness of the conductive layer of the current collector. As the elongation of the support layer is greater than that of the conductive layer and the thickness of the support layer of the current collector is greater than the total thickness of the conductive layer of the current collector, under the condition that a thickness of the current collector is given, the thickness proportion of the support layer is greater than the thickness proportion of the conductive layer, allowing for good extensibility of the insulating layer, such that the current collector can withstand a large swelling force without breaking. This allows the current collector to meet the requirement on swelling alleviation of a battery cell with high-energy density, improving the reliability of the battery cell with high-energy density.