Convergence assembly and cylindrical battery

The utility model provides a confluence assembly and cylindrical battery, including confluence disc and cover plate, the confluence disc has confluence surface and connecting surface opposite to the confluence surface, the cover plate has butt joint surface and exposed surface opposite to the butt joint surface, the confluence disc is provided with first groove, the first groove protrudes from the confluence surface to the direction far away from the confluence surface through the connecting surface, the cover plate is provided with a second groove body, the second groove body protrudes from the butt joint face to the direction away from the butt joint face through the exposed face, and the first groove body extends into the second groove body so that the cover plate can be connected with the confluence disc. Based on the concave-convex matching of the first groove body and the second groove body, not only can the positioning problem in the manufacturing process be solved, but also the tolerance of the roll c