US 12,011,753 B2
Forming tool and forming method for producing an overpressure predetermined breaking point in a battery cover
Bernd Ullmann, Pfinztal (DE); Rainer Berkefeld, Bad Honnef (DE); Matthias Braun, Heiningen (DE); and Torsten Becker, Suessen (DE)
Assigned to SCHULER PRESSEN GMBH, Goeppingen (DE)
Filed by SCHULER PRESSEN GMBH, Goeppingen (DE)
Filed on Aug. 10, 2021, as Appl. No. 17/398,290.
Application 17/398,290 is a continuation in part of application No. PCT/EP2020/052899, filed on Feb. 5, 2020.
Claims priority of application No. 10 2019 103 606.2 (DE), filed on Feb. 13, 2019.
Prior Publication US 2022/0023928 A1, Jan. 27, 2022
Int. Cl. B21D 22/02 (2006.01); H01M 50/147 (2021.01); H01M 50/148 (2021.01); H01M 50/342 (2021.01)
CPC B21D 22/02 (2013.01) [H01M 50/147 (2021.01); H01M 50/148 (2021.01); H01M 50/3425 (2021.01); H01M 2200/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. 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) is groove-shaped and extends partly or completely 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, wherein a shortest distance between the cavity inner flank (41) and the cavity outer flank (42) orthogonal to the axial direction (R) defines a first width (b1),
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 stamp part (32) extends partly or completely around the axis (A), wherein the stamp part (32) comprises a ring part inner surface (34) extending between the free end (33) and a stamp base area (31) and a ring part outer surface (35) extending between the free end (33) and the stamp base area (31), wherein the ring part inner surface (34) and the ring part outer surface (35) are arranged with distance to one another orthogonal to the axial direction (R), wherein this distance defines a second width (b2), wherein the first width (b1) is longer than the second width (b2), at least about the factor two, 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),
a notching tool (51) is provided, which is configured to form at least one notch (50) inside of the bead (15).