BATTERY CELL AND MANUFACTURING METHOD THEREOF, BATTERY AND ELECTRICAL DEVICE

The present application provides a battery cell, and a manufacturing method and a manufacturing equipment thereof, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a shell, an end cover, an electrode assembly, and a current collector component. The shell has an opening, and the inner surface of the shell is provided with a first limit part in a protruding manner. The end cover covers the opening. The electrode assembly and the end cover are respectively located on both sides of the first limit part, and the electrode assembly has a tab on the side facing the end cover. The current collector component includes a body part and a connecting part connected to the body part, and the connecting part is connected to the first limit part. The body part includes a first welding region and a second welding region, the first welding region is located on the periphery of the second welding region, the first welding region and the second welding region are separated by the connection position between the connecting part and the body part, and both the first welding region and the second welding region are welded to the tab. This structure of battery cell can reduce the occurrence of local overcurrent between the outer ring of the tab and the current collector component, thereby reducing the risk of polarization and lithium precipitation of the battery cell.