Battery end cover structure and cylindrical battery

The invention relates to the technical field of cylindrical batteries, in particular to a battery end cover structure and a cylindrical battery, the structure comprises a bus piece, a connecting piece, an end cover and a pole assembly; the connecting sheet and the confluence sheet are arranged in an overlapped manner, the edge of the connecting sheet is connected with the edge of the confluence sheet, and a set connecting width is formed between the connecting sheet and the confluence sheet; the pole assembly penetrates through the middle part of the end cover and is in sealed connection with the end cover, and one side, far away from the convergence sheet, of the connecting sheet is connected with the end part of the pole assembly. According to the technical scheme, the connection (welding) area between the confluence piece and the roll core tab and the pole is large, so that the overcurrent capacity of the connection position is enhanced, and the required overcurrent capacity can be achieved by adjusting th