Abstract: The invention concerns a button cell, particularly for a tire pressure sensor, with a first electric pole formed by a first front side and a second electric pole (4) formed by a second front side opposite to the first front side; with a first contact tab mounted on the first front side, which includes a substantially flat extension inside the plane of the first front side, or with a first contact tab formed by the first front side; with a second contact tab mounted on the second front side, which extends from the plane of the second front side at an angle substantially up to the plane of the first front side; with an insulation layer mounted on the button cell, at least in the region of the first and second contact tabs or over the external periphery of the button cell. The invention is characterised in that the insulation layer includes a plurality of openings, which traverse the insulation layer completely and which are distributed over the surface of the insulation layer.