Rupture membrane, rechargeable-battery cover equipped with said rupture membrane, rechargeable battery equipped therewith, and method for producing the rupture membrane

Abstract

The invention relates to a rupture membrane (13) for a rechargeable-battery cover (4) of a rechargeable battery (1), the rupture membrane (13) comprising: - a base body (15) having a longitudinal extent (22) and, transversely thereto, a transverse extent (23), and a base-body thickness (18) which extends between a base-body bottom surface (16) and a base-body top surface (17), wherein a burst-embossment structure (19) is formed in the base body (15). The burst-embossment structure (19) has: a burst embossment (20) with a burst-embossment depth (68); and at least one deformation embossment (21) with a deformation-embossment depth (69), the burst-embossment depth (68) being greater than the deformation-embossment depth (69), and the burst embossment (20) and the deformation embossment (21) being arranged in the base-body top surface (17).

Description

[0001] BURST MEMBRANE, AS WELL AS AN ACCUMULATOR COVER FOR AN ACCUMULATOR EQUIPPED WITH THE BURST MEMBRANE, AS WELL AS AN ACCUMULATOR EQUIPPED THEREBY AND A METHOD FOR MANUFACTURING THE BURST MEMBRANE

[0002] The invention relates to a bursting membrane, as well as an accumulator lid equipped with the bursting membrane for an accumulator, as well as an accumulator equipped therewith and a method for manufacturing the bursting membrane.

[0003] Batteries for electrical energy storage in motor vehicles are known from the prior art. It is also known that these batteries can experience thermal runaway, for example, due to a fault within the battery. Thermal runaway generates, in particular, hot gas at high pressure, which can destroy the battery and also neighboring batteries. Therefore, it is known that this hot gas should be vented from the thermally runaway battery. To enable this, rupture diaphragms are known from the prior art, which rupture at a predetermined pressure within the battery and thus release the hot gas into the surrounding area.

[0004] DE102019128794A1, for example, discloses a bursting membrane with a bursting embossed structure that is star-shaped and / or radial on the surface. In particular, the bursting membrane is essentially circular.

[0005] The rupture diaphragm known from DE102019128794A1 has the disadvantage that the bursting pressure at which the diaphragm bursts cannot be set with sufficient precision, and therefore the bursting behavior is insufficient to protect the accumulator from damage. Furthermore, the rupture diaphragm known from DE102019128794A1 is difficult to manufacture because high process forces occur during the manufacturing process, making series production unstable.

[0006] The object of the present invention was to overcome the disadvantages of the prior art and to provide an improved rupture membrane, as well as an accumulator lid equipped with the rupture membrane, as well as an accumulator equipped therewith, and a method for manufacturing the rupture membrane. This object is achieved by a device and a method according to the claims.

[0007] According to the invention, a burst membrane is designed for a battery cover of a battery. The burst membrane comprises:

[0008] - a base body with a longitudinal extent and, perpendicular to it, a transverse extent and a base body thickness, which extends between a base body base surface and a base body top surface, wherein a burst embossing structure is formed in the base body.

[0009] The burst embossing structure has a burst embossing with a burst embossing depth and at least one deformation embossing with a deformation embossing depth, wherein the burst embossing depth is greater than the deformation embossing depth.

[0010] The rupture membrane according to the invention offers the advantage that a precise burst pressure can be set through the combination of burst embossing and deformation embossing. In particular, this measure enables the burst behavior to exhibit high repeatability. The deformation embossing ensures that the rupture membrane is subjected to tensile stress, rather than buckling stress, in the burst embossing area when overpressure occurs, thereby improving the burst behavior, especially the crack resistance.

[0011] Furthermore, it may be provided that the bursting embossing and / or the deformation embossing are arranged in the base body surface. In particular, it may be provided that both the bursting embossing and the deformation embossing are arranged in the base body surface. This measure can further improve the bursting behavior of the rupture membrane.

[0012] Furthermore, it can be advantageous for the bursting diaphragm to have a main burst diaphragm extending along its longitudinal axis, and a first and second secondary burst diaphragm arranged in a Y-shape at the first longitudinal end of the main burst diaphragm, and a third and fourth secondary burst diaphragm arranged in a Y-shape at the second longitudinal end of the main burst diaphragm. This measure can further improve the opening of the bursting membrane, thereby increasing the released opening cross-section and thus improving the escape of gas from the accumulator.

[0013] Furthermore, it can be provided that the longitudinal extent of the base body is greater than the transverse extent of the base body. It can also be provided that the transverse extent is between 20% and 50%, in particular between 30% and 42%, preferably between 34% and 37% of the longitudinal extent.

[0014] A rupture membrane of this size, in particular, can exhibit surprisingly good rupture properties.

[0015] Furthermore, the deformation embossing can be provided with a first longitudinal section and a second longitudinal section, wherein the first longitudinal section and the second longitudinal section are arranged parallel to the main burst embossing, the first longitudinal section being arranged on a first side of the main burst embossing at a first distance from the main burst embossing, and the second longitudinal section being arranged on a second side of the main burst embossing at a second distance from the main burst embossing. This measure, in particular, can achieve improved bursting behavior and thus allow the burst pressure to be precisely controlled.

[0016] Another advantageous configuration is one in which the first longitudinal section is arranged between the first secondary embossing and the third secondary embossing, wherein the first longitudinal section is arranged at a first longitudinal distance to the first secondary embossing and at a third longitudinal distance to the third secondary embossing, and the second longitudinal section is arranged between the second secondary embossing and the fourth secondary embossing, wherein the second longitudinal section is arranged at a second longitudinal distance to the second secondary embossing and at a fourth longitudinal distance to the fourth secondary embossing. This has the advantage that the secondary embossings are not negatively affected by the longitudinal sections of the deformation embossings.

[0017] According to a further development, it is possible for a first arc segment to be formed, which is assigned to the first longitudinal section and the second longitudinal section, with the first arc segment extending between the first secondary burst indentation and the second secondary burst indentation, and with the first arc segment being arranged at a first arc distance to the first secondary burst indentation and at a second arc distance to the second secondary burst indentation. This measure can further improve the bursting behavior.Furthermore, it can be advantageous for the deformation embossing to have a third longitudinal section and a fourth longitudinal section, wherein the third longitudinal section and the fourth longitudinal section are arranged parallel to the main bursting embossing, and wherein the third longitudinal section is arranged on the first side of the main bursting embossing at a third distance from the main bursting embossing, and the fourth longitudinal section is arranged on the second side of the main bursting embossing at a fourth distance from the main bursting embossing, where the third distance is greater than the first distance and the fourth distance is greater than the second distance. This has the advantage that the two adjacent deformation embossings result in improved forming behavior of the bursting membrane and thus improve its bursting behavior.

[0018] Furthermore, a reverse deformation embossing can be provided, with the reverse deformation embossing being located on the base surface of the body. The reverse deformation embossing offers the surprising advantage of further improving the bursting behavior.

[0019] Furthermore, it can be advantageous for the reverse deformation embossing to have a first reverse longitudinal section and a second reverse longitudinal section, wherein the first reverse longitudinal section and the second reverse longitudinal section are arranged parallel to the main burst embossing, the first reverse longitudinal section being arranged at a first rearward distance from the main burst embossing with respect to its transverse extent on a first side, and the second reverse longitudinal section being arranged at a second rearward distance from the main burst embossing with respect to its transverse extent on a second side. This measure can achieve surprisingly good bursting behavior.In particular, it may be provided that the deformation embossing has a fifth longitudinal section and a sixth longitudinal section, wherein the fifth longitudinal section and the sixth longitudinal section are arranged parallel to the main burst embossing, and wherein the fifth longitudinal section is arranged on the first side of the main burst embossing at a fifth distance from the main burst embossing, and the sixth longitudinal section is arranged on the second side of the main burst embossing at a sixth distance from the main burst embossing, wherein the fifth distance is greater than the third distance and the sixth distance is greater than the fourth distance. Furthermore, it may be provided that the first rear longitudinal section and the second rear longitudinal section are spaced further from the main burst embossing than all of the deformation embossings.

[0020] Furthermore, it can be stipulated that the first rearward distance is greater than the first distance. This measure can achieve surprisingly good bursting behavior.

[0021] Furthermore, it can be provided that the reverse deformation embossing has a reverse deformation embossing depth, wherein the reverse deformation embossing depth is between 20% and 65%, in particular between 40% and 60%, preferably between 45% and 55% of the base body thickness.

[0022] It is also advantageous to have a design in which the base body thickness can be between 0.25mm and 1mm, in particular between 0.3mm and 0.6mm, preferably between 0.45mm and 0.55mm.

[0023] According to further training, it is possible that the burst embossing depth is between 50% and 90%, in particular between 60% and 85%, preferably between 70% and 78% of the base body thickness.

[0024] Furthermore, it may be advantageous for the deformation embossing depth to be between 20% and 65%, in particular between 40% and 60%, preferably between 45% and 55% of the base body thickness.

[0025] The dimensions and designs described above are not merely simple construction measures; numerous tests have shown that surprisingly good burst resistance can be achieved for accumulators when the dimensions are chosen within the specified limits. This measure improves the operational reliability of the accumulators.

[0026] Particularly when combining the individual measures within the specified limits, a surprisingly good bursting behavior can be achieved.

[0027] The invention further relates to an accumulator cover for an accumulator, the accumulator cover comprising:

[0028] - a cover plate, wherein the cover plate is bounded on the outside by an outer surface and on the inside by an inner surface;

[0029] - a bursting membrane which is arranged in the cover plate, wherein the base body base surface faces the outside and the base body top surface faces the inside.

[0030] The rupture membrane is formed according to one of the above characteristics.

[0031] The accumulator cover according to the invention offers the advantage that the operational reliability of the accumulator can be improved through the measures according to the invention.

[0032] Furthermore, it can be advantageous for the rupture membrane to be formed integrally within the cover plate. This offers the benefit that, in such a design, the rupture membrane does not need to be a separate component embedded in the cover plate. This can be achieved, in particular, by creating the base body with its required thickness within the cover plate through an embossing or forming process, whereby the surface of the base body is compressed from the greater thickness of the cover plate to the required thickness. Subsequently, the rupture embossing and the deformation embossing can be applied to the base body. Alternatively, the rupture embossing and the deformation embossing can be applied to the base body simultaneously with the creation of the required thickness.

[0033] In an alternative design variant, the rupture diaphragm can be designed as a structurally independent component, which is inserted into the cover plate by means of welding, in particular laser welding. Specifically, it has proven particularly advantageous if the base body is designed with the specified thickness to ensure good weldability of the rupture diaphragm to the accumulator cover.

[0034] The invention further relates to an accumulator comprising:

[0035] - a battery housing;

[0036] - an accumulator cover, wherein the accumulator cover is coupled to the accumulator housing such that the inside of the cover plate faces a receiving space of the accumulator housing; - an electrode pack which is arranged in the receiving space of the accumulator housing. The accumulator cover is designed according to one of the above embodiments.

[0037] The accumulator according to the invention has the advantage that the operational reliability of the accumulator can be improved by the measures according to the invention.

[0038] The invention also relates to a method for manufacturing a burst membrane for a battery cover of a battery, comprising the following method steps:

[0039] - Providing a base body with a longitudinal extent and, perpendicular to it, a transverse extent and a base body thickness, which extends between a base body base surface and a base body top surface;

[0040] - Imprinting a B-shaped structure into the base body.

[0041] The burst embossing structure has a burst embossing with a burst embossing depth and at least one deformation embossing with a deformation embossing depth, wherein the burst embossing depth is greater than the deformation embossing depth and wherein the burst embossing and the deformation embossing are arranged in the base body top surface.

[0042] The inventive process steps enable an improved manufacturing method for producing an improved rupture membrane. In particular, the process forces during the production of the rupture membrane can be kept low, thereby improving the repeatability of the manufacturing process and thus enabling the production of an improved rupture membrane. Repeatability can be increased, in particular, by using a rupture membrane with a base thickness between 0.25 mm and 1 mm, especially between 0.3 mm and 0.6 mm, and preferably between 0.45 mm and 0.55 mm, which is relatively thick compared to conventional rupture membranes. This greater material thickness can be compensated for by deformation embossing to achieve good deformability of the rupture membrane material.

[0043] Furthermore, it can be provided that the bursting embossing and / or the deformation embossing are arranged in the base body surface. In particular, it can be provided that both the bursting embossing and the deformation embossing are arranged in the base body surface. This measure can further improve the bursting behavior of the rupture membrane. It is also advantageous to design the membrane in which the deformation embossing is applied prior to the bursting embossing. Surprisingly, this measure can improve the quality of the rupture membrane.

[0044] Furthermore, it is possible to connect several of the accumulators to form a module. Several of these modules can, in turn, form the traction battery of an electric vehicle. Alternatively, the accumulators can also be referred to as individual cells.

[0045] To better understand the invention, it is explained in more detail with reference to the following figures.

[0046] They each show, in a highly simplified, schematic representation:

[0047] Fig. 1 shows an exploded view of a first embodiment of an accumulator in a perspective view;

[0048] Fig. 2 shows a first perspective view of a first embodiment of a rupture membrane;

[0049] Fig. 3 shows a second perspective view of the first embodiment of the rupture membrane;

[0050] Fig. 4 shows a top view of the first embodiment of the rupture membrane;

[0051] Fig. 5 shows a cross-sectional view according to the section line VV of the first embodiment of the bursting membrane;

[0052] Fig. 6 shows a first perspective view of a second embodiment of the rupture membrane;

[0053] Fig. 7 shows a first perspective view of a third embodiment of the rupture membrane;

[0054] Fig. 8 shows a first perspective view of a fourth embodiment of the rupture membrane; Fig. 9 shows a first perspective view of a fifth embodiment of the rupture membrane.

[0055] It should be noted at the outset that in the differently described embodiments, identical parts are provided with the same reference numerals or component designations, and the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these positional designations must be applied analogously to the new position if the position changes.

[0056] Fig. 1 shows a perspective exploded view of a first embodiment of an accumulator 1.

[0057] As can be seen from Fig. 1, it can be provided that the accumulator 1 has an accumulator housing 2 which has a receiving space 3 which is closed by means of at least one accumulator cover 4.

[0058] As can be seen from Fig. 1, it can be provided that a positive terminal 5 and a negative terminal 6 are formed in the accumulator cover 4.

[0059] As can be further seen from Fig. 1, the accumulator cover 4 may have a cover plate 7 which forms the base of the accumulator cover 4. In particular, the cover plate 7 may be welded to the accumulator housing 2 in order to seal the interior of the accumulator 1 from the environment.

[0060] In particular, it may be provided that the positive terminal 5 and the negative terminal 6 are arranged in the cover plate 7.

[0061] Furthermore, it may be provided that the interior of the accumulator 1 serves to accommodate an electrode package 8.

[0062] As can be further seen in Fig. 1, the base of the accumulator cover 4 can form the cover plate 7. The cover plate 7 can have an outer side 9 with an outer surface 10 and an inner side 11 with an inner surface 12. The outer side 9 can be defined as the side that is on the outside when the accumulator 1 is installed. The inner side 11 can be defined as the side that is inside the accumulator 1 when it is installed and faces the interior of the accumulator 1.

[0063] As can be further seen from Fig. 1, a bursting membrane 13 can be inserted into the cover plate 7 of the accumulator cover 4. The bursting membrane 13 can be designed as a separate component and arranged in a recess 14 of the cover plate by means of a welded connection, in particular by means of a laser weld.

[0064] Figures 2 and 3 show a first embodiment of the rupture membrane 13 in a first perspective view and a second perspective view, respectively. Figure 4 shows the first embodiment of the rupture membrane 13 in a top view, and Figure 5 shows a sectional view along section line VV from Figure 4.

[0065] As can be seen from Figures 2 and 3, the rupture membrane 13 can be provided to comprise a base body 15. The base body 15 can have a base body surface 16 and a base body top surface 17.

[0066] The base body surface 16 and the base body top surface 17 can be spaced apart from each other in a base body thickness 18.

[0067] In the illustration according to Fig. 2, the base body top surface 17 of the base body 15 is visible, i.e., facing upwards. In the illustration according to Fig. 3, the base body bottom surface 16 of the base body 15 is visible, i.e., facing upwards.

[0068] As can be seen from Fig. 2, it can be provided that a bursting embossing structure 19 is arranged in the base body 15.

[0069] The burst embossing structure 19 can comprise a burst embossing 20. Furthermore, it can be provided that the burst embossing structure 19 comprises a deformation embossing 21. The burst embossing 20 and the deformation embossing 21 can each have several structural elements.

[0070] Furthermore, the base body 15 may be provided to have a longitudinal extent 22 and a transverse extent 23. In particular, the longitudinal extent may be 55.95 mm. Furthermore, the transverse extent 23 may be 19.95 mm. It may also be provided that the base surface 16 of the base body 15 has a substantially rectangular shape. The two outer longitudinal ends in the longitudinal extent 22 may be rounded by an arcuate first curve 24 and an arcuate second curve 25, respectively. The first curve 24 and the second curve 25 may have a radius that is half the size of the transverse extent 23, so that the curves 24 and 25 are formed continuously with the same radius.

[0071] Furthermore, it may be provided that a main bursting embossing 26 is formed, which is arranged in the base body's top surface 17. The main bursting embossing 26 can extend along the longitudinal dimension 22 of the base body 15 between a first longitudinal end 27 and a second longitudinal end 28. In particular, it may be provided that the main bursting embossing 26 has a straight shape. Furthermore, it may be provided that the main bursting embossing 26 is arranged centrally with respect to the transverse dimension 23 in the base body 15.

[0072] Furthermore, it can be provided that a first secondary burst embossing 29 and a second secondary burst embossing 30 are arranged at the first longitudinal end 27 of the main burst embossing 26. The first secondary burst embossing 29 and the second secondary burst embossing 30 can extend in a Y-shape from the first longitudinal end 27 of the main burst embossing 26.

[0073] Furthermore, it can be provided that a third secondary embossing 31 and a fourth secondary embossing 32 are arranged at the second longitudinal end 28 of the main embossing 26. The third secondary embossing 31 and the fourth secondary embossing 32 can extend in a Y-shape from the second longitudinal end 28 of the main embossing 26.

[0074] In particular, it may be provided that the first secondary stamp 29 and the third secondary stamp 31 are arranged on the first side 33 of the main stamp 26. Furthermore, it may be provided that the second secondary stamp 30 and the fourth secondary stamp 32 are arranged on the second side 34 of the main stamp 26.

[0075] Furthermore, the deformation embossing 21 may comprise a first longitudinal section 35 and a second longitudinal section 36. The first longitudinal section 35 and the second longitudinal section 36 may be arranged parallel to the main burst embossing 26.

[0076] Furthermore, it can be provided that the first longitudinal section 35 is arranged on the first side 33 of the main bursting embossing 26 and that the second longitudinal section 36 is arranged on the second side 34 of the main bursting embossing 26. Furthermore, it can be provided that the first longitudinal section 35 and the second longitudinal section 36 are symmetrical with respect to the main bursting embossing 26. Furthermore, it can be provided that the first longitudinal section 35 is arranged between the first secondary bursting embossing 29 and the third secondary bursting embossing 31. Furthermore, it can be provided that the second longitudinal section 36 is arranged between the second secondary bursting embossing 30 and the fourth secondary bursting embossing 32.

[0077] Furthermore, it may be provided that a first arc section 37 is formed in the region of the first longitudinal end 27 of the main burst embossing 26, and that a second arc section 38 is formed in the region of the second longitudinal end 28 of the main burst embossing 26. The first arc section 37 and the second arc section 38 may form part of the deformation embossing 21. In particular, it may be provided that the first arc section 37 and the second arc section 38 are arranged as extensions of the first longitudinal section 35 and the second longitudinal section 36, respectively, or connect them. Furthermore, it may be provided that the first arc section 37 is arranged between the first secondary burst embossing 29 and the second secondary burst embossing 30. Furthermore, it may be provided that the second arc section 38 is arranged between the third secondary burst embossing 31 and the fourth secondary burst embossing 32.

[0078] Furthermore, it may be provided that the deformation embossing 21 includes a third longitudinal section.

[0079] 39 and a fourth longitudinal section 40. The third longitudinal section 39 and the fourth longitudinal section 40 can be arranged parallel to the main bursting embossing 26.

[0080] Furthermore, it can be provided that the third longitudinal section 39 is arranged on the first side 33 of the main bursting embossing 26 and that the fourth longitudinal section 40 is arranged on the second side 34 of the main bursting embossing 26.

[0081] Furthermore, it may be provided that the third longitudinal section 39 and the fourth longitudinal section

[0082] The third longitudinal section 39 is symmetrically formed with respect to the main burst embossing 26. Furthermore, it may be provided that the third longitudinal section 39 is arranged between the first secondary burst embossing 29 and the third secondary burst embossing 31. Furthermore, it may be provided that the fourth longitudinal section 40 is arranged between the second secondary burst embossing 30 and the fourth secondary burst embossing 32. Furthermore, it may be provided that a third arc section 41 is formed in the region of the first longitudinal end 27 of the main burst embossing 26 and that a fourth arc section 42 is formed in the region of the second longitudinal end 28 of the main burst embossing 26. The third arc section 41 and the fourth arc section 42 can form part of the deformation embossing 21. In particular, it may be provided that the third arc section 41 and the fourth arc section 42 are arranged as extensions of the first longitudinal section 35 and the second longitudinal section 36, or connect them together.Furthermore, it may be provided that the third arc section 41 is arranged between the first secondary embossing 29 and the second secondary embossing 30. Furthermore, it may be provided that the fourth arc section 42 is arranged between the third secondary embossing 31 and the fourth secondary embossing 32.

[0083] Furthermore, the deformation embossing 21 may comprise a fifth longitudinal section 43 and a sixth longitudinal section 44. The fifth longitudinal section 43 and the sixth longitudinal section 44 may be arranged parallel to the main burst embossing 26.

[0084] Furthermore, it can be provided that the fifth longitudinal section 43 is arranged on the first side 33 of the main bursting embossing 26 and that the sixth longitudinal section 44 is arranged on the second side 34 of the main bursting embossing 26.

[0085] Furthermore, it may be provided that the fifth longitudinal section 43 and the sixth longitudinal section 44 are symmetrical with respect to the main bursting mark 26. Furthermore, it may be provided that the fifth longitudinal section 43 is arranged between the first secondary bursting mark 29 and the third secondary bursting mark 31. Furthermore, it may be provided that the sixth longitudinal section 44 is arranged between the second secondary bursting mark 30 and the fourth secondary bursting mark 32.

[0086] Furthermore, it may be provided that a fifth arc section 45 is formed in the region of the first longitudinal end 27 of the main burst embossing 26, and that a sixth arc section 46 is formed in the region of the second longitudinal end 28 of the main burst embossing 26. The fifth arc section 45 and the sixth arc section 46 may form part of the deformation embossing 21. In particular, it may be provided that the fifth arc section 45 and the sixth arc section 46 are arranged as extensions of the first longitudinal section 35 and the second longitudinal section 36, respectively, or connect them. Furthermore, it may be provided that the fifth arc section 45 is arranged between the first secondary burst embossing 29 and the second secondary burst embossing 30. Furthermore, it may be provided that the sixth arc section 46 is arranged between the third secondary burst embossing 31 and the fourth secondary burst embossing 32.

[0087] As can be seen from Fig. 2, it is also possible that the third longitudinal section 39 and the fourth longitudinal section 40 are symmetrical with respect to the main bursting embossing 26. Furthermore, it is possible that the fifth longitudinal section 43 and the sixth longitudinal section 44 are symmetrical with respect to the main bursting embossing 26.

[0088] As can be seen particularly well in Fig. 3, a reverse deformation embossing 47 may be provided. In particular, the reverse deformation embossing 47 may have a first reverse longitudinal section 48 and a second reverse longitudinal section 49. Furthermore, the reverse deformation embossing 47 may have a first reverse arc section 50 and a second reverse arc section 51. In particular, the first reverse arc section 50 and the second reverse arc section 51 may connect directly to the first reverse longitudinal section 48 and the second reverse longitudinal section 49, respectively. Furthermore, the first reverse longitudinal section 48 may be arranged further outwards than the fifth longitudinal section 43. Furthermore, the second reverse longitudinal section 49 may be arranged further outwards than the sixth longitudinal section 44.

[0089] Fig. 4 shows the first embodiment of the base body 15 in a top view of the base body top surface 17.

[0090] As can be seen from Fig. 4, the first longitudinal section 35 can be arranged at a first distance 52 from the main bursting embossing 26. Furthermore, the second longitudinal section 36 can be arranged at a second distance 53 from the main bursting embossing 26. The first distance 52 and the second distance 53 can each be 1.95 mm.

[0091] Furthermore, it may be provided that the first longitudinal section 35 is arranged at a first longitudinal distance 54 from the first secondary embossing 29. Furthermore, it may be provided that the first longitudinal section 35 is arranged at a third longitudinal distance 55 from the third secondary embossing 31. Furthermore, it may be provided that the second longitudinal section 36 is arranged at a second longitudinal distance 56 from the second secondary embossing 30. Furthermore, it may be provided that the second longitudinal section 36 is arranged at a fourth longitudinal distance 57 from the fourth secondary embossing 32.

[0092] Furthermore, it may be provided that the first arc section 37 is arranged at a first arc distance 58 from the first secondary embossing 29. Furthermore, it may be provided that the first arc section 37 is arranged at a second arc distance 59 from the second secondary embossing 30. Furthermore, it may be provided that the second arc section 38 is arranged at a third arc distance 60 from the third secondary embossing 31.

[0093] Furthermore, it can be provided that the second arc section 38 is arranged in a fourth arc section 61 for the fourth secondary embossing 32. The longitudinal distances 54, 55, 56, 57 can be approximately 0.25 mm. The arc distances 58, 59, 60, 61 can be approximately 0.25 mm.

[0094] Furthermore, the third longitudinal section 39 may be arranged at a third distance 62 from the main bursting feature 26. Furthermore, the fourth longitudinal section 40 may be arranged at a fourth distance 63 from the main bursting feature 26. The third distance 62 and the fourth distance 63 may be 3.95 mm.

[0095] Furthermore, the fifth longitudinal section 43 may be arranged at a fifth distance 64 from the main bursting feature 26. Furthermore, the sixth longitudinal section 44 may be arranged at a sixth distance 65 from the main bursting feature 26. The fifth distance 64 and the sixth distance 65 may be 5.95 mm.

[0096] The spacing of the third longitudinal section 39, the fourth longitudinal section 40, the third arc section 41, the fourth arc section 42, the fifth longitudinal section 43, the sixth longitudinal section 44, the fifth arc section 45, and the sixth arc section 46 to the first secondary embossing 29, to the second secondary embossing 30, to the third secondary embossing 31, and to the fourth secondary embossing 32 can be implemented mutatis mutandis to the already described spacing of the first longitudinal section 35, the second longitudinal section 36, the first arc section 37, and the second arc section 38, and are therefore not listed separately for the sake of simplicity. Fig. 5 shows a sectional view of the base body 15 along section line V-V from Fig.

[0097] 4.

[0098] As can be seen in Fig. 4, the first rear longitudinal section 48 is arranged at a first rear distance 66 from the main bursting embossing 26. Furthermore, it can be provided that the second rear longitudinal section 49 is arranged at a second rear distance 67 from the main bursting embossing 26. The first rear distance 66 and the second rear distance 67 can be 5.95 mm.

[0099] Furthermore, it may be provided that the bursting mark 20 has a bursting depth of 68. The bursting depth of 68 can be the same for all parts of the bursting mark, such as the main bursting mark 26, the first secondary bursting mark 29, the second secondary bursting mark 30, the third secondary bursting mark 31, and the fourth secondary bursting mark 32. In particular, it may be provided that the bursting depth of 68 is 0.37 mm.

[0100] Furthermore, it can be provided that the deformation embossing 21 has a deformation embossing depth 69. The deformation embossing depth 69 can be the same for all components of the deformation embossing 21, such as longitudinal sections 35, 36, 39, 40, 43, 44 and arc sections 37, 38, 41, 42, 45, 46. In particular, it can be provided that the deformation embossing depth 69 is 0.25 mm.

[0101] Furthermore, it can be provided that the reverse deformation embossing 47 has a reverse deformation embossing depth 70. The reverse deformation embossing depth 70 can be the same for all sections, such as the first reverse longitudinal section 48, the second reverse longitudinal section 49, the first reverse arc section 50, and the second reverse arc section 51. In particular, it can be provided that the deformation embossing depth 69 and the reverse deformation embossing depth 70 are the same. Furthermore, it can be provided that the reverse deformation embossing depth is 0.25 mm.

[0102] As can be further seen from Fig. 4, the first secondary embossing 29 can be arranged at a first angle 71 to the main embossing 26. Furthermore, the second secondary embossing 30 can be arranged at a second angle 72 to the main embossing 26. Furthermore, the third secondary embossing 31 can be arranged at a third angle 73 to the main embossing 26. Furthermore, the fourth secondary embossing 32 can be arranged at a fourth angle 74 to the main embossing 26. The first angle 71, the second angle 72, the third angle 73, and the fourth angle 74 can be of equal measure. In particular, the angles 71, 72, 73, and 74 can each be 45°.

[0103] Figures 6 to 9 each show a further, and possibly independent, embodiment of the rupture diaphragm 13, whereby the same reference numerals or component designations are used for identical parts as in the preceding Figures 1 to 5. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 5.

[0104] Figures 6 to 9 each depict independent embodiments, each simplified from the fully described embodiment in Figure 2 by removing certain features. For the sake of simplicity, reference is made to the complete description of the first embodiment in Figure 2, and the features not described in Figures 6 to 9 can be omitted. As an additional variation of the embodiments in Figures 6 to 9, the reverse deformation embossing 47 can be included or omitted. Furthermore, it is also conceivable that individual features from the fully described first embodiment may be omitted.

[0105] The specified dimensions of the described embodiments, when combined, lead to a surprisingly good bursting result for a bursting membrane 13 in an accumulator 1. Even when these specifically specified dimensions are varied in the range of +10% to -10%, a surprisingly good bursting result can be achieved.

[0106] The exemplary embodiments show possible implementation variants. It should be noted here that the invention is not limited to the specifically illustrated embodiments, but rather various combinations of the individual embodiments are also possible, and this possibility of variation lies within the capabilities of a person skilled in the art in this technical field, due to the teaching of the present invention. The scope of protection is defined by the claims. However, the description and the drawings must be consulted for the interpretation of the claims. Individual features or combinations of features from the different exemplary embodiments shown and described can, in themselves, represent independent inventive solutions. The problem underlying these independent inventive solutions can be found in the description.

[0107] All references to value ranges in this description are to be understood as encompassing any and all sub-ranges thereof, e.g., the reference 1 to 10 is to be understood as including all sub-ranges, starting from the lower limit 1 and the upper limit 10, i.e., all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g., 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0108] Finally, for the sake of clarity, it should be noted that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced in size.

[0109] Reference sign setup

[0110] Accumulator 32 fourth secondary marking Accumulator housing 33 first side receiving space 34 second side Accumulator cover 35 first longitudinal section positive terminal 36 second longitudinal section negative terminal 37 first arc section cover plate 38 second arc section electrode pack 39 third longitudinal section outside 40 fourth longitudinal section

[0111] Outer surface 41 third arc section inner surface 42 fourth arc section

[0112] Inner surface 43 fifth longitudinal section burst membrane 44 sixth longitudinal section recess 45 fifth arc section base body 46 sixth arc section

[0113] Base body surface 47 rear deformation embossing Base body top surface 48 first rear longitudinal section Base body thickness 49 second rear longitudinal burst embossing structure section burst embossing 50 first rear arc section

[0114] Deformation embossing cut Longitudinal stretching 51 Second reverse arc transverse stretching Cut First rounding 52 First distance Second rounding 53 Second distance Main burst embossing 54 First longitudinal distance First longitudinal end 55 Third longitudinal distance Second longitudinal end 56 Second longitudinal distance First secondary burst embossing 57 Fourth longitudinal distance Second secondary burst embossing 58 First arc distance Third secondary burst embossing 59 Second arc distance Third arc distance Fourth arc distance Fifth distance Sixth distance First reverse distance Second reverse distance Burst embossing depth

[0115] Deformation embossing depth, reverse deformation, embossing depth, first angle, second angle, third angle, fourth angle

Claims

Patent claims 1. Burst membrane (13) for an accumulator cover (4) of an accumulator (1), comprising the burst membrane (13): - a base body (15) with a longitudinal extent (22) and transversely to it a transverse extent (23) and a base body thickness (18) which extends between a base body base surface (16) and a base body top surface (17), wherein a burst embossing structure (19) is formed in the base body (15), characterized in that the burst embossing structure (19) has a burst embossing (20) with a burst embossing depth (68) and at least a deformation embossing (21) with a deformation embossing depth (69), wherein the burst embossing depth (68) is greater than the deformation embossing depth (69).

2. Burst membrane (13) according to claim 1, characterized in that the burst embossing (20) and / or the deformation embossing (21) are arranged in the base body cover surface (17), in particular that the burst embossing (20) and the deformation embossing (21) are arranged in the base body cover surface (17).

3. Burst membrane (13) according to claim 1 or 2, characterized in that the burst embossing (20) has a main burst embossing (26) which extends in the direction of the longitudinal extension (22) and has a first secondary burst embossing (29) and a second secondary burst embossing (30) which are arranged in a Y-shape at a first longitudinal end (27) of the main burst embossing (26) and has a third secondary burst embossing (31) and a fourth secondary burst embossing (32) which are arranged in a Y-shape at a second longitudinal end (28) of the main burst embossing (26).

4. Burst membrane (13) according to one of claims 1 to 3, characterized in that the transverse extent (23) is between 20% and 50%, in particular between 30% and 42%, preferably between 34% and 37% of the longitudinal extent (22).

5. Burst membrane (13) according to one of claims 3 to 4, characterized in that the deformation embossing (21) has a first longitudinal section (35) and a second longitudinal section (36), wherein the first longitudinal section (35) and the second longitudinal section (36) are arranged parallel to the main bursting embossing (26), wherein the first longitudinal section (35) is arranged on a first side (33) of the main bursting embossing (26) at a first distance (52) from the main bursting embossing (26) and the second longitudinal section (36) is arranged on a second side (34) of the main bursting embossing (26) at a second distance (53) from the main bursting embossing (26).

6. Burst membrane (13) according to claim 5, characterized in that the first longitudinal section (35) is arranged between the first secondary burst embossing (29) and the third secondary burst embossing (31), wherein the first longitudinal section (35) is arranged at a first longitudinal distance (54) to the first secondary burst embossing (29) and at a third longitudinal distance (55) to the third secondary burst embossing (31), and the second longitudinal section (36) is arranged between the second secondary burst embossing (30) and the fourth secondary burst embossing (32), wherein the second longitudinal section (36) is arranged at a second longitudinal distance (56) to the second secondary burst embossing (30) and at a fourth longitudinal distance (57) to the fourth secondary burst embossing (32).

7. Burst membrane (13) according to claim 5 or 6, characterized in that a first arc section (37) is formed which is associated with the first longitudinal section (35) and the second longitudinal section (36), wherein the first arc section (37) extends between the first secondary burst embossing (29) and the second secondary burst embossing (30), wherein the first arc section (37) is arranged at a first arc distance (58) to the first secondary burst embossing (29) and at a second arc distance (59) to the second secondary burst embossing (30).

8. Burst membrane (13) according to one of claims 5 to 7, characterized in that the deformation embossing (21) has a third longitudinal section (39) and a fourth longitudinal section (40), wherein the third longitudinal section (39) and the fourth longitudinal section (40) are arranged parallel to the main burst embossing (26) and wherein the third longitudinal section (39) is arranged on the first side (33) of the main burst embossing (26) at a third distance (62) from the main burst embossing (26) and the fourth longitudinal section (40) is arranged on the second side (34) of the main burst embossing (26) at a fourth distance (63) from the main burst embossing (26) is arranged, wherein the third distance (62) is larger than the first distance (52) and the fourth distance (63) is larger than the second distance (53).

9. Burst membrane (13) according to one of claims 2 to 8, characterized in that a rear deformation embossing (47) is formed, wherein the rear deformation embossing (47) is arranged on the base body surface (16).

10. Burst membrane (13) according to claim 9, characterized in that the rear deformation embossing (47) has a first rear longitudinal section (48) and a second rear longitudinal section (49), wherein the first rear longitudinal section (48) and the second rear longitudinal section (49) are arranged parallel to the main burst embossing (26), wherein the first rear longitudinal section (48) is arranged at a first side (33) of the main burst embossing (26) at a first rear distance (66) to the main burst embossing (26) and the second rear longitudinal section (49) is arranged at a second side (34) of the main burst embossing (26) at a second rear distance (67) to the main burst embossing (26).

11. Burst membrane (13) according to claims 5 and 10, characterized in that the first rearward distance (66) is larger than the first distance (52).

12. Burst membrane (13) according to one of claims 9 to 11, characterized in that the back deformation embossing (47) has a back deformation embossing depth (70), wherein the back deformation embossing depth (70) is between 20% and 65%, in particular between 40% and 60%, preferably between 45% and 55% of the base body thickness (18).

13. Burst membrane (13) according to one of the preceding claims, characterized in that the base body thickness (18) is between 0.25mm and 1mm, in particular between 0.3mm and 0.6mm, preferably between 0.45mm and 0.55mm.

14. Burst membrane (13) according to one of the preceding claims, characterized in that the burst embossing depth (68) is between 50% and 90%, in particular between 60% and 85%, preferably between 70% and 78% of the base body thickness (18).

15. Burst membrane (13) according to one of the preceding claims, characterized in that the deformation embossing depth (69) is between 20% and 65%, in particular between 40% and 60%, preferably between 45% and 55% of the base body thickness (18).

16. Accumulator cover (4) for an accumulator (1), the accumulator cover (4) comprising: - a cover plate (7), wherein the cover plate (7) is bounded on the outside (9) by an outer surface (10) and on the inside (11) by an inner surface (12); - a bursting membrane (13) which is arranged in the cover plate (7), wherein the base body base surface (16) faces the outside (9) and the base body top surface (17) faces the inside (11), characterized in that the bursting membrane (13) is designed according to one of the preceding claims.

17. Accumulator cover (4) according to claim 16, characterized in that the bursting membrane (13) is formed integrally in the cover plate (7).

18. Accumulator cover (4) according to claim 16, characterized in that the burst membrane (13) is designed as a structurally independent component which is inserted into the cover plate (7) by means of a welding, in particular by means of a laser welding.

19. Accumulator (1) comprising: - a battery housing (2); - an accumulator cover (4), wherein the accumulator cover (4) is coupled to the accumulator housing (2) such that the inside (11) of the cover plate (7) faces a receiving space (3) of the accumulator housing (2); - an electrode package (8) which is located in the receiving space (3) of the accumulator housing (2) is arranged, characterized in that the accumulator cover (4) is designed according to one of claims 16 to 18.

20. Method for producing a burst membrane (13), in particular a burst membrane (13) according to one of claims 1 to 15, for an accumulator cover (4), in particular for an accumulator cover (4) according to one of claims 16 to 18, of an accumulator (1), in particular an accumulator (1) according to claim 19, comprising the method steps: - Providing a base body (15) with a longitudinal extension (22) and transverse to it a transverse extension (23) and a base body thickness (18) which extends between a base body base surface (16) and a base body top surface (17); - Embossing a burst embossing structure (19) into the base body (15), characterized in that the burst embossing structure (19) has a burst embossing (20) with a burst embossing depth (68) and at least a deformation embossing (21) with a deformation embossing depth (69), wherein the burst embossing depth (68) is greater than the deformation embossing depth (69).

21. Method according to claim 20, characterized in that the burst embossing (20) and the deformation embossing (21) are arranged in the base body cover surface (17), in particular that the burst embossing (20) and the deformation embossing (21) are arranged in the base body cover surface (17).

22. Method according to claim 20 or 21, characterized in that the deformation embossing (21) is embossed before the burst embossing (20).

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