Battery cap and cylindrical battery

The utility model provides a battery cap and a cylindrical battery, and relates to the technical field of new energy, the battery cap comprises a cap main body, a pole main body is arranged on the cap main body in a penetrating manner, the lower end of the pole main body is provided with a snap fastener fixing piece, the snap fastener fixing piece is provided with a bottom plate which is in interference fit with the snap fastener fixing piece, and the bottom plate is used for being connected with a battery cell tab. According to the battery cap provided by the utility model, the pole main body arranged on the cap main body is connected with the snap fastener fixing piece, and the bottom plate is connected with the tab; when the pole main body needs to be connected with the pole lug, the pole lug is connected with the pole main body through the bottom plate and the snap fastener fixing piece, so that the pole lug is conducted with the pole main body; compared with the prior art, the assembly difficulty is redu