Cylindrical battery and battery device

The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery device.The cylindrical battery comprises a battery cell and a shell, the shell comprises a barrel and a cover plate, a containing cavity with an opening is formed in the barrel, the battery cell is arranged in the containing cavity, and the cover plate blocks the opening; wherein the barrel comprises a main body section and a step section, the step section is located on one side, close to the cover plate, of the main body section, the inner wall of the step section is sunken in the direction away from the battery cell so as to form a positioning boss on the inner wall of the barrel, the cover plate at least partially abuts against the positioning boss, the thickness of the step section is a, and the thickness of the step section is a. The thickness of the main body section is b, and a/b is greater than or equal to 0.2 and less than or equal to 0.9. And the production efficiency of the battery ca