Forming tool for producing an overpressure predetermined breaking point in a battery cover for a battery cell housing, the forming tool comprising: a die tool which has a forming cavity in a support surface, wherein the forming cavity extends around an axis and has a cavity bottom, wherein the distance between the support surface and the cavity bottom defines a first depth in an axial direction parallel to the axis, wherein a cavity inner flank adjoins the cavity bottom at right angle to the axial direction on an inner side of the forming cavity and a cavity outer flank adjoins the cavity bottom on an outer side of the forming cavity opposite the inner side, wherein the shortest distance between the cavity inner flank and the cavity outer flank at right angle to the axial direction defines a first width, a stamping tool which has a stamping part on its side facing the die tool, which extends in the axial direction from a stamping base area to a free end, wherein the distance between the free end of the stamping part and the stamping base area defines a second depth, wherein the stamping part is positioned in the axial direction above the cavity bottom and corresponds in cross-section to a bead of the overpressure predetermined breaking point to be formed in the battery cover, wherein the stamping part has a ring part inner surface extending between the free end and the stamping base area and a ring part outer surface extending between the free end and the stamping base area, which are arranged at a distance from one another at right angles to the axial direction, wherein the distance between the ring part inner surface and the ring part outer surface defines a second width, characterized in that the second depth is larger than the first depth, the first width is at least a factor of 2 larger than the second width, and the forming tool comprises a notching tool arranged to form at least one notch inside the bead. a die tool which has a forming cavity in a support surface, wherein the forming cavity extends around an axis and has a cavity bottom, wherein the distance between the support surface and the cavity bottom defines a first depth in an axial direction parallel to the axis, wherein a cavity inner flank adjoins the cavity bottom at right angle to the axial direction on an inner side of the forming cavity and a cavity outer flank adjoins the cavity bottom on an outer side of the forming cavity opposite the inner side, wherein the shortest distance between the cavity inner flank and the cavity outer flank at right angle to the axial direction defines a first width, a stamping tool which has a stamping part on its side facing the die tool, which extends in the axial direction from a stamping base area to a free end, wherein the distance between the free end of the stamping part and the stamping base area defines a second depth, wherein the stamping part is positioned in the axial direction above the cavity bottom and corresponds in cross-section to a bead of the overpressure predetermined breaking point to be formed in the battery cover, wherein the stamping part has a ring part inner surface extending between the free end and the stamping base area and a ring part outer surface extending between the free end and the stamping base area, which are arranged at a distance from one another at right angles to the axial direction, wherein the distance between the ring part inner surface and the ring part outer surface defines a second width, characterized in that the second depth is larger than the first depth, the first width is at least a factor of 2 larger than the second width, and the forming tool comprises a notching tool arranged to form at least one notch inside the bead.