Current feedthrough and material converter

Abstract

The invention relates to a current feedthrough (100) comprising a busbar (109), an elastomer seal (101) in which a recess (102) for the busbar (109) is formed, wherein the busbar (109) is arranged to project through the recess (102) of the elastomer seal (101), and a crimping unit by means of which the elastomer seal (101) can be crimped so that the busbar (109) is enclosed gas-tight by the elastomer seal (101), and a material converter, in particular an electrolyzer or a fuel cell, with such a current feedthrough (100).

Description

[0001] The present invention relates to a current feedthrough in which, in particular, a busbar is enclosed gas-tight by an elastomer seal, as well as a housing arrangement with such a current feedthrough and a material converter. Background of the invention

[0002] Cables and / or busbars can be used to establish an electrical connection between a material converter, such as an electrolyzer (for splitting or converting water into hydrogen and oxygen) or a fuel cell (for converting, for example, hydrogen and oxygen into water), and power electronic components. The material converter may be housed in an enclosure, and it may be necessary, particularly for explosion protection reasons, for the material converter to be gas-tightly separated from the power electronic components. In particular, the cables or busbars that penetrate the enclosure must be gas-tightly sealed. Disclosure of the invention

[0003] According to the invention, a current feedthrough, in which in particular a busbar is gas-tightly enclosed by an elastomer seal, as well as a housing arrangement and a material converter, in particular an electrolyzer or a fuel cell, are proposed with the features of the independent claims. Advantageous embodiments are the subject of the dependent claims and the following description.

[0004] The invention relates to a current feedthrough comprising a busbar, an elastomer seal, and a crimping unit. The elastomer seal has a recess for the busbar, which projects through this recess. The crimping unit allows the elastomer seal to be crimped so that the busbar is gas-tightly enclosed by the elastomer seal.

[0005] The elastomer seal exhibits particularly elastic properties and is made of a gas-tight material. By compression, the volume enclosed by the recess in the elastomer seal can be reduced, allowing the busbar protruding through the recess to be gas-tightly enclosed by the elastomer seal. The recess can have a cross-sectional area that is substantially (geometrically) similar to that of the busbar. In particular, a (possibly slight) press fit can already exist between the busbar and the elastomer seal before compression.

[0006] The busbars can have a rectangular cross-sectional area (i.e., perpendicular to a longitudinal direction or main extension direction) and be designed to establish an electrical contact between a material converter, which is designed in particular to carry out electrolysis or a fuel cell reaction, furthermore in particular using hydrogen and / or oxygen, and an electronic component, for example a power electronic switching arrangement.

[0007] The material converter can be designed within a housing assembly such that it is spatially, and in particular gas-tightly, separated from the electronic component. The busbars can be routed from the material converter to the electronic component, for example, via the proposed feedthrough through a housing opening formed in the housing assembly. The feedthrough can be gas-tightly integrated into the housing opening, thus ensuring a gas-tight separation between the material converter and the electronic component. The housing opening can have a substantially (geometrically) similar cross-sectional area to the elastomer seal. In particular, a (possibly slight) interference fit can already exist between the housing opening and the elastomer seal before crimping.In particular, by pressing the elastomer seal, both the busbar is enclosed gas-tight by the elastomer seal and the housing opening is sealed gas-tight by the elastomer seal.

[0008] The gas-tight separation of the chemical converter from the electronic component prevents gases used or generated during the conversion process, such as hydrogen and / or oxygen, from reaching the electronic component due to any leaks or other defects, thus preventing ignition or explosion. This gas-tight separation significantly improves process safety. Ignition or explosions can be caused by sparks, which can occur, for example, during switching operations, particularly of relays, or due to short circuits, or by overheating of individual electronic components.

[0009] In one embodiment, the crimping unit has at least two side plates between which the elastomer seal is arranged. The at least two side plates can be clamped together by means of clamping devices, such as screws. This allows a crimping unit to be provided with very few simple components.

[0010] The at least two side plates can be made entirely or at least partially of metal such as aluminum, steel, etc., or of an electrically non-conductive material such as plastic.

[0011] Screws can be guided through corresponding screw recesses, which essentially have the diameter of the respective screw, through the side plates and elastomer seal and secured with corresponding nuts. This allows the position of the side plates and the elastomer seal relative to each other to be determined and fixed. The screws can also be gas-tightly enclosed by the elastomer seal through compression.

[0012] In one embodiment, at least one side plate of the at least two side plates of the crimping unit has a side plate recess for the busbar.

[0013] The recess in the side plate of the respective side plate can have a cross-sectional area that is essentially (geometrically) similar to that of the recess in the elastomer seal.

[0014] The side plate recess of the respective side plate can be arranged in such a way that its respective cross-sectional area and the cross-sectional area of ​​the recess of the elastomer seal overlap, so that the busbar can be arranged to protrude through both the side plate recess of the respective side plate and the recess of the elastomer seal.

[0015] The recess in the side plate of the respective side plate can be designed such that its cross-sectional area essentially corresponds to the cross-sectional area of ​​the busbar (as explained above, perpendicular to its main direction of extension).

[0016] The recess in each side plate can be designed such that the busbar is enclosed by the respective side plate at a uniform distance from the contour of the busbar's cross-sectional area. By clamping the side plates, it is possible to exert a substantially uniform mechanical pressure on the elastomer seal, particularly in the area of ​​the elastomer seal recess.

[0017] The side plates can each be arranged in a plane perpendicular to the main direction of extension of the busbar, i.e., in particular perpendicular to the direction in which the busbar projects through the recess of the elastomer seal. By means of compression, the elastomer seal can be pressed symmetrically against the busbar, whereby the busbar can be advantageously, and in particular gas-tightly, enclosed by the elastomer seal.

[0018] The side plates can be designed as round plates, particularly with the same or different side plate diameters. In particular, at least one side plate is smaller than the housing opening, so that the cable gland can be easily inserted into the housing opening. A side plate can also be larger than the housing opening, for example, to define a stop that aligns the elastomer seal relative to the housing opening. The elastomer seal can also be designed as a round plate with a corresponding elastomer seal diameter. The side plate recess in the side plate and the recess in the elastomer seal can be centrally located, i.e., point-symmetrical to the respective center point of the side plate or the elastomer seal.

[0019] In one embodiment, at least one of the at least two side plates of the clamping unit has a side plate slot between the side plate recess and a side plate edge. The busbar can be inserted into the side plate recess through this side plate slot. For example, the side plate slot can have a sufficient width to allow the busbar to be inserted into the side plate recess. This facilitates the insertion of the busbar into a predetermined position, in which it is arranged to penetrate the side plate recess.

[0020] In one embodiment, at least one of the at least two side plates has two slots formed between the respective side plate recess and the side plate edge. In other words, a side plate can also be made up of multiple parts, as shown later in the figure. This makes it possible to attach the side plates as intended without having to guide the busbar along its main direction of travel through the respective side plate recess, which is particularly difficult if the ends of the busbar are mechanically connected, for example, to a fabric converter and / or an electronic component.

[0021] In one embodiment, the elastomer seal has at least one slot between the recess for the busbar and an edge of the elastomer seal. The busbar can be inserted into the recess through this slot.

[0022] The elastomer seal exhibits particularly elastic properties, allowing it to be deformed so that the inner surfaces of the slot can be separated sufficiently to guide the busbar through the slot into a designated position. The designated position is, in particular, a position in which the busbar is arranged so that it protrudes through the opening in the elastomer seal.

[0023] In this embodiment, the busbar can be brought into the intended position particularly easily, whereby the busbar does not have to be guided through the recess along its main direction of extension, which is essentially not possible if, for example, as described above, the ends of the busbar are mechanically connected, or the busbar has a non-uniform cross-sectional area along its main direction of extension, such that the cross-sectional area is, for example, larger in some areas than the cross-sectional area of ​​the recess, along the direction in which the busbar projects through the recess of the elastomer seal.

[0024] The slot can be pressed by the pressing unit in such a way that the inner surfaces of the slot are gas-tight against each other.

[0025] In one embodiment, the elastomer seal has at least two slots between the recess for the busbar and an edge of the elastomer seal, so that the elastomer seal consists of at least two sealing parts.

[0026] Due to its multi-part design, the elastomer seal can be positioned particularly easily so that it encloses the busbar, with the busbar protruding through the recess in the elastomer seal. Therefore, the busbar does not need to be guided through the recess along its main direction of extension, which, as described above, may not be possible in certain cases.

[0027] Furthermore, a gas-tight connection between the inner surfaces of the slots can be created by pressing using the pressing unit.

[0028] The elastomer seal can consist entirely or at least partially of a material that is gas-tight and elastically deformable, such that the busbar can be gas-tightly enclosed by the elastomer seal, particularly by mechanical compression. The elastomer seal is, in particular, impermeable to water and / or oxygen. Furthermore, the elastomer seal is, in particular, non-electrically conductive, so that a current flowing through the busbar cannot flow away via the elastomer seal. In one embodiment, the elastomer seal can be made of a material selected from rubber, silicone, EPDM, and neoprene.

[0029] In one embodiment, the current feedthrough comprises at least one insulating collar, wherein the at least one insulating collar encloses the busbar. The at least one insulating collar is arranged between the busbar and the crimping unit, so that the busbar is separated from the crimping unit by means of the at least one insulating collar, and in particular electrically insulated. This ensures that no electrical flashover occurs between the busbar and the crimping unit, specifically a side plate.

[0030] In one embodiment, the at least one insulating collar is connected to the elastomeric seal and / or formed as part of the elastomeric seal. This allows a suitable elastomeric seal to be equipped with an insulating collar during its manufacture.

[0031] The inclusion of at least one insulating collar prevents electrical contact between the busbar and the crimping unit, which may comprise several metal plates. This reduces any potential hazard from an unintended current flowing through the crimping unit.

[0032] At least one insulation collar can be designed in such a way that it encloses the busbar flush and / or extends beyond the crimping unit or the elastomer seal along the main direction of extension of the busbar.

[0033] The at least one insulation collar can be designed as part of the elastomer seal, whereby the spatial position of the insulation collar can be determined or fixed, particularly relative to the elastomer seal.

[0034] The insulation collar can comprise several insulation collar elements, allowing it to be advantageously arranged to enclose the busbar. In particular, the busbar does not need to be guided through the insulation collar along its main direction of extension. The multiple insulation elements are assembled in such a way that the busbar is completely enclosed by the insulation collar in the circumferential direction, and in particular, there is no connection to the crimping unit.

[0035] The at least one insulating collar is arranged in or on the recess of the elastomeric seal and projects along the main direction of extension of the busbar beyond the recess and the crimping unit. If the insulating collar is formed as part of the elastomeric seal, it can be designed such that the flanks or inner surfaces of the recess of the elastomeric seal extend beyond the crimping unit along the main direction of extension of the busbar. The elastomeric seal can have at least one slot between the recess of the elastomeric seal and an edge of the elastomeric seal, such that the at least one slot passes through the insulating collar and the insulating collar thus comprises several insulating collar elements.

[0036] In one embodiment, the current passage has several busbars, wherein the elastomer seal has a recess for each of the several busbars.

[0037] This allows the multiple busbars to be routed through the cable gland in a gas-tight manner. The multiple busbars can, for example, each carry one of several electrical phases, or be configured to establish contact with one of several electronic components.

[0038] The elastomer seal can have at least one slot between the recess of the respective busbar and an edge of the elastomer seal. Furthermore, an insulating collar can be arranged around at least one, and in particular around all, of the multiple busbars, as described above.

[0039] The invention further relates to a housing arrangement which has a housing opening and the proposed current passage which is formed in the housing opening, wherein the pressed elastomer seal seals the housing opening gas-tight.

[0040] The current feedthrough allows at least one busbar to be routed gas-tight from the housing assembly. Furthermore, the cross-sectional area of ​​the housing opening can be essentially the same as, or geometrically similar to, the cross-sectional area of ​​the elastomer seal, so that the current feedthrough can be inserted into the housing opening in such a way that the elastomer seal essentially fills the opening flush. The elastomer seal can then be compressed, particularly using the compression unit, to create a gas-tight connection between the elastomer seal and the housing opening.

[0041] The invention also relates to a material converter which has the proposed housing arrangement, in particular an electrolyzer or a fuel cell.

[0042] The material converter can be arranged within the housing assembly in such a way that it is gas-tightly enclosed by the housing assembly. This prevents at least one gas required or generated during the material conversion, in particular hydrogen and / or oxygen, from escaping the housing assembly, thus reducing the risk of ignition of the at least one gas and / or an explosion. Ignition and / or an explosion can be triggered, for example, by sparks that may occur during the switching of electronic components or due to short circuits, or by overheating of one or more electronic components.

[0043] By means of the current feedthrough, which is arranged in a gas-tight manner in the housing opening, the at least one busbar can be led out of the housing arrangement in a gas-tight manner, so that the escape of the at least one gas is sufficiently unlikely and the corresponding dangers described above can be reduced.

[0044] The busbars can be connected on the side of the cable gland facing away from the material converter to one or more electronic components, which may be power electronic components in particular. The busbars can serve to supply the electrical energy required for electrolysis or to carry away the electrical energy converted in a reverse electrolysis (fuel cell reaction).

[0045] The housing arrangement can also include, in particular gas-tight, inlets and / or outlets for the at least one gas, especially for hydrogen and / or oxygen. The gases required or released during the chemical reaction can be supplied to or removed from the chemical converter via these inlets and / or outlets.

[0046] It is also possible that the electronic components are arranged in a housing assembly as described above, i.e., are enclosed by it in a gas-tight manner, while the mass converter is arranged outside the housing assembly. The mass converter can be arranged in a first housing assembly and the electronic components in a second housing assembly.

[0047] Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawing.

[0048] The invention is schematically illustrated in the drawing using exemplary embodiments and is described below with reference to the drawing. Brief description of the drawings Fig. Figures 1a to 1c schematically show an embodiment of a proposed current feedthrough in different views. Fig. 2a and Fig. Figure 2b schematically shows another embodiment of a proposed current feedthrough in different views. embodiment(s) of the invention

[0049] In Fig. Figure 1a shows a schematic embodiment of a proposed current feedthrough in a perspective view from an oblique angle above.

[0050] The current feedthrough 100 has an elastomer seal 101 in which a recess 102 is formed, through which a busbar can be arranged to project. The elastomer seal 101 is designed as a cylindrical disk, with the recess 102 being arranged centrally, in particular point-symmetrically to the center of the round cross-sectional area of ​​the elastomer seal 101 and / or axially symmetrically to a diagonal.

[0051] The recess 102 has a rectangular cross-sectional area, allowing a busbar with a similarly rectangular cross-sectional area to be inserted into it in a gas-tight manner. A first insulating collar 103a is attached to the elastomer seal, extending the recess 102 along an axis R perpendicular to a main plane of extension of the elastomer seal 101.

[0052] The power feedthrough 100 also has a crimping unit comprising two side plates 104a, 104b. The side plates 104a, 104b are designed as cylindrical discs with a round cross-sectional area and each has a central side plate recess 105a.

[0053] A first of the two side plates 104a is arranged on a first of the two rounded sides of the elastomeric seal 101, such that the first insulating collar 103a projects through the side plate recess 105a. A second of the two side plates 104b is arranged on a second, in particular the other, of the two rounded sides of the elastomeric seal 101, such that a second insulating collar 103b projects through the side plate recess 105a.

[0054] The insulation collars 103a, 103b each extend beyond the respective side plate 104a, 104b, so the height along the respective insulation collar 103a, 103b along the axis R is greater than the thickness of the respective side plate 104a, 104b.

[0055] The side plates 104a, 104b each have two side plate slots 106a, 106b, which run between the respective side plate recess 105a and a side plate edge of the respective side plate 104a, 104b. The side plate slots 106a, 106b run radially and, in the example shown, parallel to one of the long sides of the rectangular cross-sectional area of ​​the recess 102, but can run in any direction. Each of the two side plates 104a, 104b is therefore multi-part, here formed in two parts, thus comprising two side plate parts.

[0056] The two side plates 104a, 104b are connected to each other by means of several screws 107a and corresponding nuts 107b. The side plates 104a, 104b and the elastomer seal 101 have corresponding recesses through which the screws 107a can be guided. By means of the screw connection, the elastomer seal 101 can be compressed, whereby, in particular, a busbar, which is arranged projecting through the recess 102, can be gas-tightly enclosed by the elastomer seal 101. Likewise, the screws 107a can be gas-tightly enclosed by the elastomer seal 101 in this way.

[0057] In Fig. 1b is the one in Fig. Figure 1a shows the current feedthrough 100 in a different perspective view. Here, the second of the two side plates 104b is shown in the figure above.

[0058] The second side plate 104b also has, in particular, two side plate slots 106c, 106d between the central side plate recess 105b and a side plate edge of the side plate 104b. The side plate slots 106c, 106d run radially and parallel to one of the long sides of the rectangular cross-sectional area of ​​the recess 102, analogous to the side plate slots 106a, 106b formed in the first side plate 104a. The slots 106a, 106b of the first side plate 104a and the side plate slots 106c, 106d of the second side plate 104b lie, in particular, in a plane along the axis R.

[0059] In this view, the second insulation collar 103b can be seen, which is arranged and designed analogously to the first insulation collar 103a.

[0060] This view also shows that the elastomer seal 101 has a slot 108 which runs from the recess 102 to an edge of the elastomer seal 101. The busbar can be inserted into the recess 102 particularly advantageously through this slot 108.

[0061] In Fig. 1c is a sectional view of the area in the Fig. 1a and Fig. The current passage shown in 1b is illustrated.

[0062] In particular, a busbar 109 is shown, which is arranged projecting through the recess 102 of the elastomer seal and the side plate recesses 105a, 105b. The busbar 109 has a rectangular cross-sectional area (perpendicular to the axis R in the figure), which essentially corresponds to the cross-sectional area of ​​the recess 102 of the elastomer seal 101.

[0063] The insulation collars 103a, 103b are arranged in abutting the elastomer seal 101 and each encloses the busbar 109. By means of the insulation collars 103a, 103b, an electrical contact between the busbar 109 and one of the side plates 104a, 104b can be prevented.

[0064] Tightening the screws, as illustrated by the vertical arrows, leads to compression of the elastomer seal 101, which in turn leads to a spatial expansion of the elastomer seal 101 into the recess 102 and radially outwards, as illustrated by the horizontal arrows.

[0065] In Fig. 2a is another embodiment of the proposed current feedthrough shown schematically in an exploded view and labelled 200.

[0066] The current feedthrough 200 has four busbars 201a to 201d, each of which has a rectangular cross-sectional area (perpendicular to an axis R) and is arranged in parallel.

[0067] The busbars 201a to 201d are each arranged projecting through side plate recesses 202 in a first side plate 203, the first side plate 203 being designed as a rectangular plate. The side plate recesses 202 each have a rectangular cross-sectional area (perpendicular to the axis R), which is designed such that the respective busbar 201a to 201d, which projects through the respective side plate recess 202, is not in contact, particularly electrical contact, with the first side plate.

[0068] The first side plate 203 also has a surrounding element 204, which serves to align or arrange a (multi-part) elastomer seal 205a, 205b.

[0069] In this embodiment, the elastomer seal 205a, 205b has four recesses 206, which are arranged in the same way as the side plate recesses 202 in the first side plate 203. The cross-sectional areas of the recesses 206 are each (geometrically) similar and essentially the same as the cross-sectional area of ​​the respective busbar 201a to 201d, so that the respective busbar 201a to 201d is enclosed, in particular flush, by the respective recess 202.

[0070] In the elastomeric seal 205a, 205b, several slots are formed, each between a recess 206 and an edge of the elastomeric seal 205a, 205b, and each between two of the four recesses 206. The slots extend, in particular, along two slot planes, each defined by a principal axis of extension of one of the busbars 201a to 201d, which runs parallel to axis R, and a parallel to the long side of the rectangular cross-sectional area of ​​the same busbar 201a to 201d, and each passing through two of the recesses 206. The elastomeric seal 205a, 205b thus comprises three sealing parts, which simplifies the arrangement of the seal.

[0071] The elastomer seal 205a, 205b also includes several insulation collars 207a, 207b, each of which extends the cross-sectional area of ​​the recesses 206 along the direction perpendicular to the main extension direction of the busbars 201a to 201d.

[0072] Furthermore, the current feedthrough 200 comprises a second (multi-part) side plate 208a, 208b, in which side plate recesses 209 are also formed, which are arranged in the same manner as the side plate recesses 202 of the first side plate 203. The second side plate 208a, 208b also has side plate slots. These side plate slots extend along two side plate slot planes, each of which is spanned by the main axis of extension of one of the busbars 201a to 201d and a parallel to the long side of the rectangular cross-sectional area of ​​the same busbar 201a to 201d, and each passes through two of the side plate recesses 209. These side plate slot planes are, in particular, shifted parallel to the slot planes along which the slots of the elastomer seal 205a, 205b extend.

[0073] The busbars 201a to 201d are arranged in pairs, with the busbars 201a to 201d of each busbar pair 201a, 201b and 201c, 201d being arranged parallel to and offset from one of the long sides of the rectangular cross-sectional area of ​​one of the two busbars 201a to 201d of the busbar pair 201a, 201b and 201c, 201d, respectively. The slot planes, along which the slots of the elastomer seal 205a, 205b run, lie directly against the side of each busbar pair 201a, 201b and 201c, 201d facing the other busbar pair 201a, 201b and 201c, 201d, respectively. The side plate slot planes abut the insulation collars 207a, 207b, each of which is arranged abutting a busbar 201a to 201d of one of the two busbar pairs 201a, 201b or 201c, 201d. The side plate slot planes are specifically located between the two busbar pairs 201a, 201b or 201c, 201d.

[0074] An inner or middle side plate section 208a, which is arranged between the two pairs of busbars 201a, 201b or 201c, 201d, is smaller than the corresponding inner or middle elastomer sealing section 205a, which is arranged between the two pairs of busbars 201a, 201b or 201c, 201d. The outer side plate sections 208b are each larger than the corresponding outer elastomer sealing sections 205b.

[0075] The inner insulation collar parts 207a, which are arranged between the two busbar pairs 201a, 201b and 201c, 201d respectively, are plate-shaped and close the respective outer insulation collar parts 207b which are groove-shaped.

[0076] In Fig. 2b is the one in Fig. 2a shows the current passage in a composite representation.

[0077] The elastomer seal 205a, 205b can be inserted, in particular flush, into the perimeter element 204 of the first side plate 203.

[0078] Furthermore, the side plate slots 210a, 210b are arranged adjacent to one another, in particular flush, in the combined form of the current feedthrough 200. By means of a screw connection, which is in Fig. 2b, which is not shown, the two side plates 203, 208a, 208b can be clamped together, thereby compressing the elastomer seal 205a, 205b. This allows the busbars 201a to 201d to be gas-tightly enclosed by the elastomer seal 205a, 205b, and likewise the elastomer seal 205a, 205b to be gas-tightly arranged in the surrounding element 204, which, for example, represents a housing opening.

Claims

[1] Current passage (100, 200), having: a busbar (109, 201a to 201d), an elastomer seal (101, 205a, 205b) in which a recess (102, 206) for the busbar (109, 201a to 201d) is formed, wherein the busbar (109, 201a to 201d) is arranged to project through the recess (102, 206) of the elastomer seal (101, 205a, 205b), and a crimping unit by means of which the elastomer seal (101, 205a, 205b) can be crimped in such a way that the busbar (109, 201a to 201d) is enclosed gas-tight by the elastomer seal (101, 205a, 205b). [2] Current feedthrough (100, 200) according to claim 1, wherein the crimping unit has at least two side plates (104a, 104b, 203, 208a, 208b) between which the elastomer seal (101, 205a, 205b) is arranged and which can be clamped together, in particular by means of screws (107a-b). [3] Current feedthrough (100, 200) according to claim 2, wherein at least one side plate (104a, 104b, 203, 208a, 208b) of the at least two side plates (104a, 104b, 203, 208a, 208b) of the crimping unit has a side plate recess (105a-b, 209) for the busbar (109, 201a to 201d), wherein the busbar (109, 201a to 201d) is arranged to project through the side plate recess (105a-b, 209). [4] Current feedthrough (100, 200) according to claim 3, wherein the at least one side plate (104a, 104b, 203, 208a, 208b) has a side plate slot () between the side plate recess (105a-b, 209) and a side plate edge of the side plate (104a, 104b, 203, 208a, 208b), wherein the busbar (109, 201a to 201d) can be inserted through the side plate slot () into the side plate recess (105a-b, 209). [5] Current feedthrough (100, 200) according to claim 3 or 4, wherein the at least one side plate (104a, 104b, 203, 208a, 208b) has two side plate slots (106a to 106d) between the side plate recess (105a-b, 209) and a side plate edge of the side plate (104a, 104b, 203, 208a, 208b). [6] Current feedthrough (100, 200) according to one of the preceding claims, wherein the elastomer seal (101, 205a, 205b) has at least one slot (108) between the recess (102, 206) for the busbar (109, 201a to 201d) and an edge of the elastomer seal (101, 205a, 205b) through which the busbar (109, 201a to 201d) can be inserted into the recess (102, 206). [7] Current feedthrough (100, 200) according to one of the preceding claims, wherein the elastomer seal (101, 205a, 205b) has at least two slots (108) between the recess (102, 206) for the busbar (109, 201a to 201d) and an edge of the elastomer seal (101, 205a, 205b). [8] Current feedthrough (100, 200) according to one of the preceding claims, wherein the elastomer seal (101, 205a, 205b) comprises at least one material selected from rubber, silicone, EPDM and neoprene. [9] Current feedthrough (100, 200) according to one of the preceding claims, further comprising at least one insulating collar (103a, 103b, 207a, 207b) which in each case surrounds the busbar (109, 201a to 201d) and which in each case is arranged between the busbar (109, 201a to 201d) and the crimping unit, so that the busbar (109, 201a to 201d) is in each case separated from the crimping unit by means of the at least one insulating collar (103a, 103b, 207a, 207b). [10] Current feedthrough (100, 200) according to claim 9, wherein the at least one insulation collar (103a, 103b, 207a, 207b) is connected to the elastomer seal (101, 205a, 205b) and / or wherein the at least one insulation collar (103a, 103b, 207a, 207b) is formed as part of the elastomer seal (101, 205a, 205b). [11] Current feedthrough (100, 200) according to one of the preceding claims, comprising several busbars (109, 201a to 201d), wherein the elastomer seal (101, 205a, 205b) has a recess (102, 206) for each of the several busbars (109, 201a to 201d). [12] Housing arrangement comprising a housing opening and a current passage (100, 200) according to one of the preceding claims, which is formed in the housing opening, wherein the pressed elastomer seal (101, 205a, 205b) seals the housing opening gas-tight. [13] Material converter, in particular electrolyzer or fuel cell, comprising a housing arrangement according to claim 12.

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