Steel shell structure with flat side surface and battery

The utility model relates to the technical field of button cells, in particular to a steel shell structure with a flat surface on the side surface, which comprises an inner steel shell and an outer steel shell, the outer steel shell is sleeved outside the inner steel shell, and a welding flat surface is arranged on the end surface of one side of the outer steel shell. According to the utility model, the welding flat surface is arranged, tin, nickel, silver and the like or other metal beneficial to welding can be plated on the welding flat surface, so that a wire or a plug-in wire can be more easily welded on the outer steel shell, and the welding flat surface is used as a Pack welding area and is used for welding operation with the wire or the plug-in wire, so that when the outer steel shell is welded on the side wall of the Pack, the wire or the plug-in wire can be prevented from being damaged. The problem that contact surfaces of the outer steel shell and the lead or the plug-in wire are not in the same pla