BATTERY ASSEMBLY, BATTERY AND ELECTRIC VEHICLE

The present application provides a battery assembly, including an electrode pole and a current collecting plate. The current collecting plate includes a plate body and an electrical connection portion; the electrical connection portion is formed by extending and protruding from the plate body towards the electrode pole; the electrode pole is provided with a central hole, the electrical connection portion is inserted into the central hole, the side wall of the electrical connection portion and the inner wall of the central hole are fixed by welding, and the electrical connection portion is electrically connected with the electrode pole. The present application further provides a battery and an electric vehicle.