Forming tool and forming method for producing an overpressure predetermined breaking point in a battery cover

A forming tool (11) for producing an overpressure predetermined breaking point (14) in a battery cover (10) for a battery cell housing, the forming tool (11) comprising:

• a die tool (24) that comprises a forming cavity (38) in a support surface (37), wherein the forming cavity (38) extends around an axis (A) and has a cavity bottom (39), wherein the distance between the support surface (37) and the cavity bottom (39) in an axial direction (R) parallel to the axis (A) defines a first depth (t1),
• wherein a cavity inner flank (41) adjoins the cavity bottom (39) orthogonal to the axial direction (R) on an inner side of the forming cavity (38) and the cavity outer flank (42) adjoins the cavity bottom (39) on an outer side of the forming cavity (38) opposite the inner side,
• a stamping tool (23) that comprises a stamp part (32) on its side facing the die tool (24) that extends originating from a stamp base area (31) up to a free end (33), wherein the distance between the free end (33) of the stamp part (32) and the stamp base area (31) define a second depth (t2) that is larger than the first depth (t1), wherein the stamp part (32) is positioned above the cavity bottom (39) in axial direction (R) and corresponds in the cross-section to a bead (15) of the overpressure predetermined breaking point (14) to be formed in the battery cover (10).