Electrical device

Abstract

The invention relates to an electrical device comprising at least one electrical and / or electronic circuit and at least one cooling device. Both the electrical and / or electronic circuit and the cooling device are accommodated within an interior which is enclosed by a wall of the electrical device. At least one wall region or the wall as a whole is formed by an electrically conductive, in particular metal, housing element of the electrical device. The housing element further has at least one housing opening through which at least one connection piece of the cooling device is guided out of the interior to the outside of the housing element. An electrically conductive EMC (electromagnetic compatibility) contact element is arranged, in the region of the housing opening, between the housing element and the connection piece and forms at least one point of abutting contact with the housing element and / or at least one point of abutting contact with the connection piece.

Description

[0001] Description

[0002] title

[0003] Electric

[0004] The invention relates to an electrical device comprising at least one electrical and / or electronic circuit and at least one cooling device according to the preamble of the independent claim.

[0005] State of the art

[0006] It is generally known to use a cooling device to protect electrical devices from excessive heating during operation due to power loss from the electrical and / or electronic components they contain, in particular power semiconductors. Cooling devices with a fluid flow offer particularly high heat dissipation performance. In the simplest cases, water is used as the cooling fluid. Cooling devices of this type have connection pieces, usually an inlet and an outlet, for filling the cooling device with the cooling fluid and also for connecting the filled cooling device to a cooling circuit. Furthermore, electrical devices are protected from mechanical influences, in particular by an outer housing. For electrical devices with a cooling device with a fluid flow, the connection pieces must be routed through a housing opening outside the housing.It can be observed that the connection pieces in certain designs emit electromagnetic interference, which can adversely affect the operation of other electrical devices. The mechanisms for this are not fully understood, especially since the antenna effect can also occur when the cooling device itself is grounded. In designs in which the cooling device is electrically connected to the electrical and / or electronic circuit, one cause may be that the contact is not resistance-free. This causes the cooling device to exhibit a residual potential. If the cooling device is electrically insulated from the electrical and / or electronic device, the radiation effect can be caused by currents induced in the cooling device.Ultimately, the connectors act like dipoles, which act as antennas when a moving load is present and emit electromagnetic radiation. This is particularly true when alternating currents flow through the circuit. In inverters and other power modules, high voltages are also present within the electrical and / or electronic circuitry, which amplifies the radiation effect.

[0007] Disclosure of the invention

[0008] The invention is based on the object of proposing a cost-effective electromagnetically compatible design of an electrical device in which the antenna effect of connection pieces of a fluid-flowing cooling device contained in the electrical device is greatly reduced or preferably completely prevented.

[0009] This object is achieved by an electrical device having the characterizing features of the independent claim.

[0010] The invention therefore relates to an electrical device comprising at least one electrical and / or electronic circuit and at least one cooling device. The electrical and / or electronic circuit is formed on a circuit carrier. Both the electrical and / or electronic circuit and the cooling device are accommodated within an interior space enclosed by a wall of the electrical device. At least one wall region or the wall as a whole is formed by an electrically conductive, in particular metallic, housing element of the electrical device. The housing element then further comprises at least one housing opening through which at least one connection piece of the cooling device, in particular an inlet and / or outlet piece for a cooling medium, is led from the interior space to the outside of the housing element.In the area of ​​the housing opening, between the housing element and the connection piece, an electrically conductive E MV contact element (electromagnetic compatibility) is arranged, which forms at least one system contact with the housing element and / or at least one system contact with the connection piece. The system contact is therefore a galvanic contact, which results from physical contact between two contact partners via their outer surfaces by simply touching them. The contact can be caused by force from one or both contact partners. An electrically conductive path between the connection piece and the housing element is then closed via the at least one system contact, such that during operation of the electrical device, a radiation effect of the connection piece in the function of an antenna emitting electromagnetic radiation is at least reduced, but in particular largely prevented.It has been found to be advantageous that by arranging at least one such system contact in the area of ​​the housing opening or the connection piece, the formation of a magnetic field within the connection piece is measurably reduced.

[0011] Since electrical devices are designed in a wide variety of ways, depending on the application, the radiation effect can be reduced to below a permissible reference value by simply adjusting the number of system contacts in the area of ​​the connection pieces. This makes it very easy to obtain EMC-compatible electrical devices.

[0012] These then essentially have no adverse effects on other electronic devices. This ensures the operational reliability of these electrical devices in a wide variety of environments.

[0013] The measures listed in the dependent claims enable advantageous further developments and improvements of the electrical device according to the invention.

[0014] In an advantageous embodiment of the electrical device, the E MV contact element has at least one elastically flexible region on which the at least one system contact is formed. The elastically flexible region is preferably designed as a spring element, or at least as part of a spring element. By means of the elastically flexible region, an effective spring force can be used to form a system contact in order to ensure minimal mechanical contact pressure. In this case, an inserted spring element can cover a force range in such a way, both structurally and with the aid of the defined spring constant, that the formation of a system contact is still ensured even with the most unfavorable tolerance accumulation during assembly of the electrical device.

[0015] A particularly advantageous embodiment of the electrical device is that a spring force is effective in at least one system contact, which is oriented axially parallel or perpendicular to a nozzle axis. In most cases, the nozzle axis will also determine the assembly direction in which the connecting nozzle is to be guided through the housing opening. Thus, the spring effect only occurs in a final assembly position of the housing element, in which the spring force then acts opposite to the assembly direction. Advantageously, this also prevents any lateral displacements relative to the housing element, the connecting nozzle, and / or the EMC contact element. This ensures a very reliable assembly process.

[0016] With a spring force oriented perpendicular to the nozzle axis within a system contact, only a relatively low friction force is required shortly before reaching the final assembly position to form the system contact in the assembly position. If at least two system contacts are configured with opposing spring forces, the E MV contact element arranged in this way remains securely fixed in the final assembly position, as no spring force component acts against the assembly direction. This allows, for example, the E MV contact element to be pre-assembled on the cooling device or the housing element at different times and / or locations, before the connecting nozzle is finally guided through the housing opening.

[0017] Particular advantages arise from an embodiment in which the EMC contact element is made from sheet metal or wire. The use of spring steel is particularly suitable. Such a contact element can be shaped to suit a very specific application, in particular through punching, bending and / or embossing processes. This results in significant cost advantages, particularly in large quantities. Furthermore, proven forming techniques can be used to create very flexible and simple designs of the EMC contact element in which the system contacts can be fixed at defined spatial coordinates and a high degree of variance in their elastic compliance can be specifically adjusted. In particular, such an EMC contact element then has a base body onto which at least one protruding, resiliently flexible region is formed, in particular in one piece.This could, for example, be a bending tab attached to the base body on one side but otherwise punched out. Likewise, sheet metal strips attached to the base body on both sides, or even stamped protrusions, are conceivable. In this case, at least one contact is formed on the elastic region, which is then elastically deformed to form the contact. Thus, a general and cost-effective design principle has been found that can be implemented in many applications.

[0018] A preferred embodiment of the electrical device is one in which the base body partially or completely surrounds the connection piece. Two, three or more contact points are formed on the base body, arranged radially, particularly rotationally symmetrically, around a piece axis and spaced apart from one another. It can be advantageously determined by measurement that no areas with an increased radiation effect remain on all sides of the connection piece. With a larger number of contact points, the spacing between two contact points can be further reduced, and thus the achievable blocking effect for radiation. If the base body is not designed to be completely closed all the way around, at least one circumferential section is selected on which the necessary number of contact points can be formed in a corresponding arrangement with a maximum tolerable spacing to achieve the intended blocking effect.In a further development of an embodiment of the electrical device, a fastening area is connected to the base body, which fastening area forms a force, a form and / or a material connection with the connecting piece, in particular in a peripheral area of ​​the connecting piece. In this way, the EMC contact element is held stationary, so that loss protection is provided during a final assembly process of the electrical device.

[0019] The base body is preferably designed essentially in the shape of a ring. This means that the base body can have any cross-section in sections radially around a nozzle axis, but the cross-sections together form a course that is closed circumferentially around the connecting nozzle. The course is preferably essentially circular. In this case, at least one system contact is arranged outside the boundary formed by an inner circle of the ring and / or at least one system contact and / or at least one partial element of the fastening region is / are arranged within the boundary formed by the inner circle of the ring. The system contacts and / or fastening regions arranged within the inner circle can be designed to be far less elastically flexible or essentially rigid compared to the system contacts arranged outside the inner circle.This allows the EMC contact element to be designed and configured to meet the required compliance.

[0020] A very simple embodiment of the electrical device results from the EMC contact element being a wave spring, wherein the contact element and / or the fastening area is / are formed by at least one wave crest pointing toward the housing element and / or the connection piece. The orientation of the wave crests can vary in the circumferential direction of the wave spring, so that, depending on the orientation, the contact elements point toward the housing element or toward the connection piece. In a particular embodiment of the electrical device, the connection piece is essentially cylindrical.In this case, at least one first cylindrical section is arranged within the cavity, followed by a second section with decreasing diameter, and followed by a third section within the housing opening and outside the housing element, via at least two stepped shoulders. Only the first and second cylindrical sections, in contrast to the third cylindrical section, have a larger diameter than the housing opening. Furthermore, an edge surface region of the housing opening facing into the cavity and an end face of the second cylindrical section facing the housing opening are connected by means of an adhesive layer, in particular one that is media-tight. The area around the connection piece and the EMC contact element can thus advantageously be designed to be media-tight and at the same time remain very compact.In particular, the EMC contact element then has at least one contact point adjacent to the edge surface area of ​​the housing opening and at least one contact point to the end face of the first cylindrical section of the connecting piece.

[0021] In a further development of the last-described embodiment, the contact to the end face of the first cylindrical section is formed on a first leg of a section that is U-shaped in cross-section over at least one ring segment section of the base body. Furthermore, the opposite second leg of the section is arranged in the direction of the nozzle axis between the end face of the first and second cylindrical sections of the connecting nozzle. In addition, a first sub-element of the section connecting the two legs forms the fastening area for the connecting nozzle. This results in a very compact design with contact to the housing element and the connecting nozzle, as well as with a fastening area towards the connecting nozzle.

[0022] In addition, the EMC contact element can be further designed such that at the end of the first leg opposite the first sub-element, a second sub-element of the section is formed, extending as far as the second leg, as a stop limit for the EMC contact element. This ensures that in the final assembly position of the EMC contact element, it can only be elastically deformed in the direction of the nozzle axis up to a maximum extent until the second leg forms a mechanical contact with the stop limit. This ensures that the EMC contact element is not damaged during assembly, for example when being pulled onto the connecting nozzle using a pressing device to create, for example, a clamp fit within the fastening area.

[0023] Advantages also arise from an embodiment of the electrical device in which the second cylindrical section of the connecting piece has a groove-like recess into which the first sub-element of the U-shaped section of the EMC contact element engages, in particular, forming the fastening area by means of a force and / or form fit. The recess creates at least a type of undercut in the direction of the connecting piece axis, which reliably acts as a mechanical obstacle to prevent the EMC contact element from easily detaching from the connecting piece.

[0024] The previously described embodiments of the electrical device are particularly advantageous in the case where the electrical device is an inverter, in particular comprising a power module through which alternating current flows. Particularly with regard to alternating currents, which have a detrimental effect on EMC, as well as with regard to the equally detrimental high voltage ranges, the described blocking effect at the connection piece can be effectively reduced or suppressed.

[0025] Short description of the drawings

[0026] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. These show:

[0027] Fig. 1: a partial section of a partially assembled electrical device in a perspective view comprising at least one electrical and / or electronic circuit, a cooling device and a housing element, Fig. 2: a sectional view of the electrical device from Fig. 1 with a sectional plane through the connecting pieces of the cooling device,

[0028] Fig. 3a: a selective partial section with a perspective view of the cooling device in the area of ​​the connecting pieces with a first embodiment of an E MV contact element arranged there,

[0029] Fig. 3b: a selective partial section with a perspective view of the cooling device in the area of ​​the connecting pieces with a second embodiment of an EMC contact element arranged there,

[0030] Fig. 3c: an enlarged view of the second embodiment of the EMC contact element shown in Fig. 3b in a partial sectional view,

[0031] Fig. 3d: a third embodiment slightly modified from the second embodiment of the EMC contact element in a partial sectional view,

[0032] Fig. 3e: a fourth embodiment slightly modified from the third embodiment of the EMC contact element in a partial sectional view,

[0033] Fig. 3f: a plan view of a fifth embodiment of the EMC contact element in a plan view.

[0034] Embodiments of the invention

[0035] In the figures, functionally identical components are identified by the same reference numerals.

[0036] Figure 1 shows a partial section of a partially assembled electrical device 100 in a perspective view. The electrical device 100 comprises, in the partially assembled state - and also in the fully assembled state

[0037] - at least one electrical and / or electronic circuit 11 arranged on a circuit carrier 10 (hidden, therefore shown in dashed lines), a cooling device 20 and a housing element 30. The housing element 30 is electrically conductive and in particular made of metal. For example, the housing element 30 is a cast aluminum part. The housing element 30 closes a cavity 110 of the electrical device 100, in which the circuit carrier 10 and the cooling device 20 are accommodated. The electrical and / or electronic circuit 11 can be electrically contacted via an external plug connection 35. The plug connection 35 is arranged on the housing element 30 purely by way of example. The cooling device 20 is a fluid-flow cooling device in which, for example, water can be used as the cooling fluid.To fill the cooling device 20 with the cooling fluid, it generally has at least one inlet and one outlet nozzle 25, each of which is designed as a connection nozzle for connecting the cooling device 20 to a cooling system (not shown). The connection can be used, in particular, to form a cooling circuit within which the cooling fluid circulates—for example, driven by a cooling pump. The two connection nozzles 25 are guided through respective housing openings 31 through the housing element 30 and to the outside, where they protrude ready for connection. For example, the electrical device 100 is an inverter. Part of the electrical and / or electronic circuit 11 represents a power module. The heat loss generated in the power module is then transported via the cooling device 100 or the cooling fluid outside the electrical device 100 in order to limit the heating of the inverter.Other electrical devices 100 besides inverters are also conceivable, which comprise the previously described arrangement in their construction.

[0038] Figure 2 shows a sectional view of the electrical device 100 from Figure 1 with a sectional plane through the connecting pieces 25 of the cooling device 20. The cooling device 20 is formed, for example, from sheet metal material, in particular from aluminum sheet 20.1, 20.2, which are soldered together using a solder layer 21 running around the edges. They enclose a fluid chamber 22 filled with cooling fluid for heat dissipation purposes. The connecting pieces 25 are then connected to the sheet metal wall 20.1, 20.2 in a media-tight manner, for example by a solder layer that also runs around the edges, or alternatively by a press-fit fit. In the area of ​​the housing openings 31, the housing element 30 is connected to the connecting pieces 25 in a media-tight manner. An exemplary possibility is provided by the fact that an edge surface 31a of the housing opening 31 facing the cavity 110 is connected to an end surface 25a of a step shoulder 25 facing the edge surface 31a and covering it.1 of the respective connecting piece 25 is glued by means of a closed, circumferential, media-tight adhesive layer 26.

[0039] The stepped shoulder 25.1 has, in particular, a cylindrical outer surface. An electrically conductive EMC contact element 40 is arranged circumferentially around the outer surface. It is shown only schematically in Figure 2 and is described in detail in subsequent figures using exemplary embodiments. The EMC contact element 40 forms at least one system contact 40.1 to the housing element and / or at least one system contact 40.2 to the connecting piece, wherein an electrically conductive path between the connecting piece and the housing element is closed via the at least one system contact 40.1, 40.2 such that, during operation of the electrical device 100, a radiation effect of the connecting piece 25 in the function of an antenna emitting electromagnetic radiation is at least reduced, in particular largely prevented.

[0040] Figures 3a to 3f show exemplary embodiments of an EMC contact element 40. For simplicity, the housing element 30 has been essentially omitted from the illustration; in Figures 3e and 3f, the EMC contact element 40 is shown alone. What they all have in common is that they have at least one elastically flexible region 41, in particular a spring element, on which the at least one system contact 41.1, 41.2 is formed. An EMC contact element 40 is designed in particular as a sheet metal part, preferably made of a spring steel material. In principle, the respective EMC contact element 40 has a base body 40a made of the sheet metal material, which circumferentially surrounds the respective connection piece 25 at least partially - or as shown in the exemplary embodiments shown - preferably in a closed manner, and on which one or more such elastically flexible regions 41 are formed - in particular in one piece.The corresponding system contacts 41.1, 41.2 to the housing element 30 and / or to the connection piece 25 are then formed on these at the latest in a final assembled state of the electrical device 100. The system contact 41.1, 41.2 to the housing element 30 is then preferably arranged adjacent to the bonded edge surface 31a of the housing opening 31. In forming the system contacts 41.1,

[0041] 41.2 a corresponding elastically yielding area 41 is then elastically deformed.

[0042] In the first embodiment of the EMC contact element 40 according to Figure 3a, bending tabs projecting from the base body surface facing the housing element 30 are each formed as the elastically flexible region 41 within an annular base body 40a. The bending tabs are still held in the base body 40a on one side, but are otherwise exposed to it. The orientation is chosen merely as an example, namely in the circumferential direction of the circular shape of the base body 40a. An orientation facing or facing away from the nozzle axis S is also conceivable, for example. Furthermore, it is also conceivable, for example, to design the bending tab to be connected on two sides and to only allow it to protrude like a hump. Numerous designs can be implemented using known cutting, bending, and / or embossing processes. More than one system contact is provided circumferentially radially to the nozzle axis S.

[0043] 41 .1 . 41 .2 arranged, in particular rotationally symmetrical.

[0044] Figure 3b shows a modified embodiment compared to the embodiment shown in Figure 3a. Firstly, the plurality of bending tabs projecting from the base body 40a toward the housing element 30 are now oriented radially away from the nozzle axis S. The exposure of the bending tabs begins in the region of the inner circular boundary of the base body 40a. Furthermore, further bending tabs are formed on the base body 40a at a distance from these, each of which is bent for the first time in the region of the inner circular boundary of the base body 40a, facing away from the housing element 30 and parallel to the nozzle axis S. This is followed by a second bend perpendicular to the nozzle axis S, so that a U-shaped cross-section is formed. Figure 3c shows the E MV contact element 40 in a section through the nozzle axis S. The U-shaped cross-sectional profile is shown in the first and second legs 42.1, 42.2 arranged parallel to one another and in a cross-section of the two legs 42.1, 42.2 connecting sub-element 42.3. The sub-element 42.3 rests against the cylindrical outer surface of the first stepped shoulder 25.1. With further similar sub-elements 42.3 arranged radially around the nozzle axis S, a fastening area 43 of the EMC contact element 40 is formed. The fastening area 43 is therefore directly adjacent to the base body 40a and forms a frictional connection with the connecting nozzle 25, for example a clamp or press fit. Assembly can be carried out, for example, using a pressing device which pushes the E MV contact element 40 with a joining force F in the direction of the nozzle axis S over the cylindrical outer surface of the first stepped shoulder 25.1 of the connecting nozzle 25 until the first leg 42.1 rests on an end face 25.b of a second stepped shoulder 25.2 following the first stepped shoulder 25.1. In the support of the first leg 42.1 on the said end face 25.2, a system contact 41 is provided.1 , 41.2 with the connecting piece 25.

[0045] The plane of the base body 40a is located between the planes of the first and second end faces 25.1, 25.2 of the connecting piece 25, so that no contact with the housing element 30 can occur.

[0046] The design according to Figure 3d differs from the design shown in Figure 3c only in that a groove 28 is provided in the cylindrical surface of the first step shoulder 25.1. When the EMC contact element 40 is pulled over the first step shoulder 25.1, the fastening area 43 within the groove 28 can form a positive connection and, if necessary, also a frictional connection.

[0047] Figure 3e shows an additional addition to the design according to Figure 3d. At the originally free end of the first leg 42.1, a further bend follows, parallel to the nozzle axis S, in the direction of the base body 40a. This forms a limiting element 42.4, which has a gap at its end from the base body 40a. Thus, in a final assembly position of the EMC contact element 40 in the direction of the nozzle axis S, it can only be elastically deformed to a maximum extent until the second leg 42.2 forms a mechanical contact with the stop limit 42.4.

[0048] Figure 3f finally shows a further embodiment of the EMC contact element 40 in a plan view, namely in the form of a wave spring. This can be designed in many variations with regard to protruding elastically flexible regions 41. By way of example, it is shown that a first group of rotationally symmetrically arranged elastically flexible regions 41 are directed radially away from the nozzle axis S. A second elastically flexible region 41, spaced from the first group, in contrast, is directed radially to the nozzle axis S. The elastically flexible regions 41 of the said first group protrude in the direction of the housing element 30, so that an analog contact 41.1, 41.2 can be formed thereon. Furthermore, the elastically flexible regions 41 of the said second group protrude in the direction of the connecting nozzle 25, for example in the direction of the first end face 25.a, so that a system contact 41.1 , 41 .2. The wave spring can be manufactured as a sheet metal part or as a wire part.

[0049] In principle, the designs of the E MV contact element 40 according to Figures 3a to 3e could also be functionally reproduced as a wire part.

Claims

Claims 1 . Electrical device (100), comprising at least one electrical and / or electronic circuit (11) and at least one cooling device (20), which are accommodated within an interior space (110) enclosed by a wall, wherein at least one wall region or the wall is formed by an electrically conductive, in particular metallic, housing element (30) of the electrical device (100) and has at least one housing opening (31) through which at least one connection piece (25) of the cooling device (20), in particular an inlet and / or outlet piece for a cooling medium, is led from the interior space (110) to the outside of the housing element (30), characterized in that in the region of the housing opening (31) between the housing element (30) and the connection piece (25) an electrically conductive E MV contact element (40) is arranged, which has at least one system contact (41.1, 41.2) to the housing element (30) and / or at least one system contact (41.1, 41.2) to the connecting piece (25), wherein an electrically conductive path between the connecting piece (25) and the housing element (30) is closed via the at least one system contact (41.1, 41.2), such that during operation of the electrical device (100) a radiation effect of the connecting piece (25) in the function of an antenna emitting electromagnetic radiation is at least reduced, in particular largely prevented.

2. Electrical device (100) according to claim 1, characterized in that the E MV contact element (40) has at least one elastically flexible region (41), in particular a spring element, on which the at least one system contact (41.1, 41.2) is formed.

3. Electrical device (100) according to one of claims 1 or 2, characterized in that in the at least one system contact (41 .1 , 41 .2) a spring force is effective which is oriented axially parallel or perpendicular to a nozzle axis (S) 4. Electrical device (100) according to one of the preceding claims, characterized in that the E MV contact element (40) is formed from a sheet metal material or from a wire material, in particular from a spring steel material, and has a base body (40a) on which at least one protruding, elastically flexible region (41) is formed, in particular in one piece, on which the at least one system contact (41.1, 41.2) is formed and is elastically deformed in the formation of the system contact (41.1, 41.2).

5. Electrical device (100) according to claim 4, characterized in that the base body (40a) partially or completely surrounds the connection piece (25) circumferentially, wherein two, three or more system contacts (41.1, 41.2) arranged radially, in particular rotationally symmetrically, around a piece axis (S) and spaced apart from one another are formed on the base body (40a).

6. Electrical device (100) according to one of claims 4 or 5, characterized in that a fastening region (43) adjoins the base body (40a), which forms a force, a form and / or a material connection with the connecting piece (25), in particular in a peripheral region of the connecting piece (25).

7. Electrical device (100) according to one of claims 4 to 6, characterized in that the base body (40a) is designed substantially in the form of a ring, wherein at least one contact (41.1, 41.2) is arranged outside the boundary formed by an inner circle of the ring and / or wherein at least a system contact (41.1, 41.2) and / or at least one partial element of the fastening region (43) is / are arranged within the boundary formed by the inner circle of the ring.

8. Electrical device (100) according to one of claims 4 to 7, characterized in that the E MV contact element (40) is a wave spring, wherein the system contact (41.1, 41.2) and / or the fastening region (43) is / are formed by at least one wave crest pointing towards the housing element (30) and / or the connection piece (25).

9. Electrical device (100) according to one of the preceding claims, characterized in that the connecting piece (25) is essentially cylindrical in shape, wherein at least one first cylindrical section arranged within the cavity (110) and a second cylindrical section adjoining said first section with a decreasing diameter and a third cylindrical section adjoining said second section and continuing within the housing opening (31) and outside the housing element (30) are arranged via at least two stepped shoulders (25.1, 25.2), wherein only the first and the second cylindrical section have a larger diameter than the housing opening (31), and wherein an edge surface region (31a) of the housing opening (31) facing into the cavity (110) and an end face (25b) of the second cylindrical section facing the housing opening (31) are connected by means of an adhesive layer, in particular a media-tight one.

10. Electrical device (100) according to claim 9, characterized in that the E MV contact element (40) has at least one contact point (41.1, 41.2) adjacent to the edge surface region (31 a) of the housing opening (31) and at least one contact point (41.1, 41.2) to the end face (25 a) of the first cylindrical section of the connecting piece (25).

11. Electrical device (100) according to one of claims 9 or 10, characterized in that the system contact (41.1, 41.2) to the end face (25.a) of the first cylindrical section is formed on a first leg (42.1) of a section which is U-shaped in cross-section over at least one ring segment section of the base body (40a), wherein the opposite second leg (42.2) of the section is arranged in the direction of the nozzle axis (S) between the end faces (25.a, 25.b) of the first and the second cylindrical section of the connecting nozzle (25) and wherein a first partial element (42.3) of the section connecting the two legs (42.1, 42.2) forms the fastening region (43) for the connecting nozzle (25).

12. Electrical device (100) according to claim 11, characterized in that at the end of the first leg (42.1) opposite the first sub-element (42.3), a second sub-element (42.4) of the section extending as far as the second leg (42.2) is designed as a stop limit of the E MV contact element (40), whereby in a final assembly position of the E MV contact element (40) in the direction of the nozzle axis (S) is only elastically deformable at most up to the formation of a mechanical system contact (41.1, 41.2) of the second leg (42.2) with the stop limit.

13. Electrical device (100) according to one of claims 11 or 12, characterized in that the second cylindrical section has a groove-like recess (28) into which the first partial element (42.3) of the partial piece engages, in particular forming the fastening region (43) by means of a force and / or form fit.

14. Electrical device (100) according to one of the preceding claims, characterized in that the electrical device (100) is an inverter, in particular comprising a power module through which alternating current flows.

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