Shell and secondary battery

The utility model relates to a shell and a secondary battery, the shell comprises a bottom cover and a side wall, the middle part of the bottom cover is provided with a bottom cover welding area, the battery body also comprises a shell, an electrode assembly, an adapter plate and a cover plate assembly, the outer side of the electrode assembly is provided with a tab, the adapter plate comprises an adapter plate body, and the adapter plate body is provided with a through hole. A first welding area and a second welding area are arranged on the outer side of the switching piece body; the first welding area is connected with a tab of the electrode assembly, the second welding area is connected with the shell, so that current is output outwards, when the shell is welded with the adapter plate, the bottom cover welding area of the shell is thinned, the welding power can be reduced, and the phenomenon of weld penetration during welding is effectively avoided. The welding yield of the secondary battery is improved, a