Button cell with a large internal volume

A button cell comprising a leaktightly sealed housing consisting of

• a cell cup having a base, a circumferential sleeve, an intermediate region connecting the base and the sleeve, and a cut edge at the end,
• a cell cover having a base, a circumferential sleeve, an intermediate region connecting the base and the sleeve, and a cut edge at the end, and
• a seal,
• wherein the cell cover is arranged with the cut edge in front into the cell cup, and the seal between the cell cup and the cell cover is arranged such that it isolates them from each other, and wherein
• the sleeve of the cell cover is divided into a single-walled section and an adjoining circumferential double-walled opening edge with a U-shaped cross-section formed by bending the cut edge of the cell cover radially outwardly,
• the sleeve of the cell cover has a circumferential notch directly below the circumferential double-walled opening edge, in which its external diameter has a minimum value, and
• the sleeve of the cell cup has a circumferential protuberance formed by radial drawing-in which engages in this circumferential notch.