Plug connection, electric machine and vehicle

Abstract

Plug connection (40), in particular for passing electrical contacts through a housing opening (2) of a housing (3) of an electrical machine (4) from an external area (5) to an internal area (6), wherein the connector (40) has a coupling element (1) and a plug (11) for plugging onto the coupling element (1), wherein the coupling element (1) comprises: - a base plate (7) with a first side that is arranged on the outer surface (5) when the plug connection (40) is arranged on the housing (3), and a second side that is opposite the first side and is arranged on the inner surface (6) when the plug connection (40) is arranged on the housing (3), wherein the base plate (7) has on its first side a connection area (8) with at least one electrical coupling connection point (9), - a first guide wall (10), which is arranged on the first side, frames the connection area (8) and, when the plug connection (40) is arranged on the housing (3), projects from the base plate (7) to the outside (5), - a first through-opening (13) through the base plate (7), wherein the first through-opening (13) is arranged in the connection area (8) and allows pressure equalization between the interior (6) and the connection area (8) when the plug connection (40) is arranged on the housing (3), - a second through-opening (14) which is arranged in the first guide wall (10); wherein the plug (11) has: - a plug connection area (25) with at least one plug connection point (12) and - a second guide wall (26); wherein the plug connection (40) is designed such that when the plug (11) is inserted onto the coupling element (1) - the plug (11) is guided by guiding the second guide wall (26) along the first guide wall (10), and - at least one plug connection point (12) is inserted into an area framed by the first guide wall (10) and comes into contact with at least one coupling connection point (9); wherein the second guide wall (26) - frames the plug connector area (25) and protrudes from the plug connector area (25), - when the plug (11) is inserted onto the coupling element (1), the first guide wall (10) surrounds at least section by section, - is designed such that, when the plug (11) is inserted onto the coupling element (1), it covers the second through-opening (14) and allows pressure equalization between the connection area (8) and the outside (5) when the plug connection (40) is arranged on the housing (3); wherein the plug connection (40) has at least one through-channel (19, 27) which extends along the first guide wall (10) and / or along the second guide wall (26) and extends at least between the second through-opening (14) and the outside (5) when the plug connection (40) is arranged on the housing;characterized in that the second guide wall (26) is configured such that, when the plug (11) is inserted onto the coupling element (1), at least one of the at least one through-channel (27) extends along the inside of the second guide wall (26) away from the second through-opening (14) between the first guide wall (10) and the second guide wall (26); wherein the second guide wall (26) has a third through-opening (28); wherein the second through-opening (14) is completely covered by the second guide wall (26) when the plug (11) is inserted onto the coupling element (1).

Description

[0001] The invention relates to a plug connection for passing electrical contacts through a housing opening of a housing of an electrical machine from an outside area to an inside area, wherein the plug connection has a coupling element and a plug for plugging onto the coupling element.

[0002] Furthermore, the invention relates to an electric machine with such a plug connection and to a vehicle, in particular an electric or hybrid vehicle, having such an electric machine.

[0003] A coupling element or such a plug connection is used in a variety of electrical devices, for example switching devices.

[0004] To ensure pressure equalization, a pressure equalization element is often installed as a separate component. Correct installation requires a defined interface, such as a bore, a countersink, a specific surface finish, or similar features. The position on the device must also be considered, as direct contact with a high-pressure cleaner jet should be avoided.

[0005] There are catalog parts in the form of a plastic part with a built-in membrane, for example, a Gore membrane.

[0006] A connector strip with a pressure equalization element is known from EP 0 616 736 B1.

[0007] From DE 10 2007 024 472 A1, a gearbox housing for an electric drive unit of a windscreen wiper with a venting device is known, which has a vent opening with a diaphragm, wherein the vent opening is formed in the connector housing, wherein the diaphragm is arranged at an opening in the connector housing wall or at an opening in the wall of a connector sealed to it and is in contact with the vent opening via the free space given between the connector and the connector housing.

[0008] From DE 101 27 485 A1 a plugging device for an electronic housing is known, wherein a bore runs through the plug base for an air-permeable connection of the interior with the exterior of the electronic housing.

[0009] US Patent 2013 / 0109209 A1 proposes an enclosure for an electronic circuit suitable for use in motor vehicles. The enclosure features a connector and a pressure equalization element, which compensates for pressure differences occurring within the enclosure during operation of the motor vehicle.

[0010] A housing with a pressure compensation device for a pressure sensor is known from DE 36 35 165 A1.

[0011] US Patent 5,564,951 discloses an electrical connector in which a plug has a narrow, inside-to-outside groove that serves as a vent and allows pressure equalization.

[0012] One object of the invention is to ensure reliable and simple pressure equalization when electrical contacts pass through a housing opening of an electrical machine, particularly in the automotive environment.

[0013] This problem is solved by a plug connector with the features of claim 1, by an electric machine with the features of claim 10, and by a vehicle with the features of claim 11. Advantageous embodiments are the subject of the dependent claims.

[0014] The coupling element of the proposed connector thus has a base plate with a connection area enclosed by the first guide wall. The appropriately designed plug can be inserted onto the first guide wall, which guides the plug in such a way that the respective plug connection point makes contact with the respective coupling connection point. A first through-hole through the base plate is provided for pressure equalization.

[0015] A particularly reliable and simple pressure equalization is achieved by also utilizing the pressure equalization connector. This is accomplished by arranging the first through-hole in the connection area, and thus within the area enclosed by the first guide wall. If, for example, there is overpressure inside the housing, air can flow from the interior through the first through-hole into the area enclosed by the first guide wall. With a suitable, attached connector, pressure equalization is then achieved because the coupling element has a second through-hole, which is located in the first guide wall. This allows air from the area enclosed by the first guide wall to flow through the second through-hole into the exterior, thereby equalizing the pressure between the interior and exterior.By covering the second through-hole with the plugged-in connector, reliable pressure equalization is achieved, which meets even the most demanding protection classes and types. In particular, this prevents, for example, a jet of high-pressure cleaner or dirt splashed around by the vehicle from directly and with full force hitting the second through-hole.

[0016] The second through-opening can, for example, be designed as a bore or as several bores in the first guide wall.

[0017] The plug of the proposed connector has a plug contact area which is enclosed by the second guide wall. When the plug is inserted into the coupling element, the second guide wall is thus guided along the first guide wall.

[0018] The pressure equalization described above is supported by the plug in particular by the fact that, when the plug is inserted into the coupling element, the second guide wall covers the second through-opening, whereby pressure equalization can take place between the connection area and the outside.

[0019] A particularly advantageous feature for pressure equalization is the at least one through-channel, which extends along the first guide wall and / or along the second guide wall, at least between the second through-opening and the outside. This at least one through-channel ensures constant pressure equalization between the connection area and the outside, for example, by allowing air flowing from the inside to pass through the second through-opening and, guided along the through-channel, finally reach the outside. The at least one through-channel can be implemented, for instance, by having one or more projections on the outside of the first guide wall and / or on the inside of the second guide wall, so that when the plug is inserted, a cavity remains between the plug and the coupling element, forming the through-channel.In particular, the at least one through-channel enables pressure equalization and ensures it even under adverse environmental conditions, such as the presence of splashing water.

[0020] Preferably, the proposed electrical machine is an electric motor or an inverter. In particular, the electric motor is powered by the inverter. The coupling element and the connector serve, for example, to transmit electrical signals, such as measurement data from a rotary encoder or other sensor data, or to transmit electrical power, for example, to energize the stator windings of the electric motor to generate torque. In particular, the electrical machine can also be configured as a generator or an electric motor that can also be operated as a generator.

[0021] A particular advantage of the proposed connector is that, apart from the opening in which the coupling element is located, the electrical machine housing does not require any further openings for pressure equalization. This eliminates the need for additional steps such as creating a separate pressure equalization opening in the housing and, if necessary, inserting a pressure equalization element into that opening. Furthermore, all necessary tests, such as quality or leak tests, can be performed using only the compact coupling element and, if applicable, the connector, thus eliminating the need for tests on the complete electrical machine.

[0022] According to the invention, the second guide wall is further designed such that, when the plug is inserted onto the coupling element, at least one of the at least one through-channel extends along the inside of the second guide wall away from the second through-opening between the coupling guide and the second guide wall.

[0023] At least one of the at least one passage channel can always ensure pressure equalization between the connection area and the outside, for example by allowing air flowing from the interior to pass through the second passage opening and, guided along the passage channel, finally reach the outside.

[0024] In a further advantageous embodiment of the invention, at least one of the at least one through-channel is designed as a groove on the inside of the second guide wall.

[0025] Thus, at least one of the at least one through-channel is designed as a groove or notch on the surface of the second guide wall with which the plug at least partially covers the first guide wall when plugged in.

[0026] Preferably, each coupling connection point has a contact pin or a connecting tab. Alternatively, sockets for a plug connection can be used for each connector connection point.

[0027] According to the invention, the second guide wall further has a third through-opening, wherein the second through-opening is completely covered by the coupling guide when the plug is inserted onto the coupling element.

[0028] When the plug is inserted, the third through-hole is not located in the area of ​​the second through-hole, so that the protection described above against a jet of a high-pressure cleaner or against dirt splashed around by the vehicle is always guaranteed.

[0029] The air flowing from the interior to the exterior during pressure equalization, for example, is thus guided from the second opening through the space between the first guide wall and the second guide wall to the third opening, in order to finally reach the exterior.

[0030] In principle, several third through-openings can certainly be provided, so that even in a particularly dirty environment, pressure equalization can still be ensured if one of the third through-openings becomes blocked.

[0031] Providing a third through-hole allows, for example, the connector to be sealed against the coupling element, except for this third through-hole. A corresponding seal can be positioned, for instance, at the tip of the second guide wall or at the base of the first guide wall.

[0032] In an advantageous embodiment of the invention, the coupling element in the area of ​​the second through-opening has a pressure equalization element comprising a membrane which is air-permeable and / or water-impermeable, in particular splash-proof.

[0033] The pressure equalization element allows pressure equalization between the connection area and the outside, and thus also supports pressure equalization between the inside and outside. Preferably, the pressure equalization element is designed to prevent the ingress of water, especially splash water. For this purpose, the pressure equalization element has a membrane, which is preferably air-permeable and waterproof or splash-proof.

[0034] The pressure equalization element or diaphragm is particularly well protected from damage within the coupling element, as it is located in the area of ​​the second through-hole and is therefore covered by the connector when it is plugged in. This prevents, for example, a jet of water from a pressure washer or dirt splashed around by the vehicle from directly and with full force hitting the second through-hole and thus the pressure equalization element.

[0035] Preferably, a suitable receiving surface for the pressure equalization element is provided on the coupling element, particularly in the form of the second through-hole. A particular advantage of the pressure equalization element is that, during assembly, it can be applied directly to the coupling element from a carrier roller using a dispenser and applicator. Manual installation is possible to a limited extent, but is generally not necessary. Due to its position on the coupling element, the pressure equalization element is almost completely or completely covered when the connector is attached and, if necessary, locked, and thus protected from the direct high-pressure jet.

[0036] In principle, it is conceivable that another, similar pressure equalization element is provided at the first through-opening.

[0037] In a further advantageous embodiment of the invention, the coupling element in the area of ​​the second through-opening has a pressure equalization element comprising a membrane which is semipermeable.

[0038] In principle, the pressure equalization element of the present design has comparable advantages to that of the previous design. In the present design, the semipermeable membrane allows moisture or water to be transported from the connection area or the interior to the exterior by appropriate installation. At the same time, it prevents additional moisture from penetrating the connection area or the interior.

[0039] In addition to or as an alternative to the properties of the respective pressure equalization element described above, further properties, such as those described in the above-mentioned EP 0 616 736 B1, may be provided.

[0040] In a further advantageous embodiment of the invention, the coupling element has a sealing element by means of which the coupling element installed in the housing opening is sealed on its outside against the housing.

[0041] For the otherwise closed housing, the sealing element helps ensure that pressure equalization can be achieved almost exclusively via the coupling element, thus simultaneously preventing the ingress of water or dirt into the housing. For example, the sealing element can be designed as a sealing ring or O-ring.

[0042] In a further advantageous embodiment of the invention, the coupling element has a locking element for locking the plugged-on connector.

[0043] The locking element is preferably designed such that the plug snaps into place or forms a clip-like connection with the plug. The locking element can, for example, be located in the area of ​​the first guide wall, and two or more locking elements may also be provided.

[0044] Advantageously, the plug has a correspondingly equipped counterpart for the respective locking element.

[0045] In a further advantageous embodiment of the invention, the first guide wall is designed such that, when the plug is inserted, at least one further passage of the at least one through-channel extends along the outside of the first guide wall away from the second through-opening between the first guide wall and the plug.

[0046] The at least one further passage of the at least one through-channel can always ensure pressure equalization between the connection area and the outside, for example by allowing air flowing from the interior to pass through the second passage opening and, guided along the at least one further passage of the at least one through-channel, finally reach the outside.

[0047] In a further advantageous embodiment of the invention, at least one further passage of at least one through-channel is designed as a groove on the outside of the first guide wall.

[0048] Thus, at least one further through-channel is designed as a groove or notch on the surface of the first guide wall, which is at least partially covered by the plug when inserted.

[0049] In a further advantageous embodiment of the invention, the base plate has a further connection area facing the interior with at least one further electrical coupling connection point, wherein the coupling element has a third guide wall which frames the further connection area and projects from the base plate towards the interior, wherein the coupling element is designed such that a further plug inserted into or onto the coupling element is guided and at least one further plug connection point of the further plug, inserted into the area framed by the third guide wall, comes into contact with the respective further coupling connection point.

[0050] The coupling element thus serves as a coupling between a plug inserted from the outside and another plug inserted from the inside.

[0051] To ensure the pressure equalization described above between the interior and the connection area facing the exterior, the first through-opening can, for example, be positioned next to the other connection area or next to the area enclosed by the third guide wall. Alternatively, the first through-opening within the base plate can be designed as a channel, with the channel openings facing the exterior and interior not being congruent, thus creating a deflection. Furthermore, the first through-opening facing the interior can be covered by the additional connector when plugged in, and pressure equalization can be ensured by the third guide wall having another through-opening, so that even with the additional connector plugged in, pressure equalization between the connection area and the exterior is still possible.This is possible between the connector area and the interior. A fourth through-hole through the additional connector is also conceivable to ensure pressure equalization between the additional connection area and the interior.

[0052] In particular, both the at least one through-channel described above and the at least one further through-channel can be provided, wherein the respective through-channels are preferably arranged approximately congruently when the plug is inserted.

[0053] The invention will now be described and explained in more detail with reference to the exemplary embodiments shown in the figures. The figures show: Fig. 1 to 4 each show a comparative example of a plug connection; Fig. 5 and Fig. 6 an embodiment of the plug connection according to the invention; Fig. 7 and Fig. 8 each a comparative example of a plug connection; and Fig. 9 an embodiment of the proposed vehicle.

[0054] Fig. Figure 1 shows a first comparative example of the proposed connector 40. A cross-section is shown, with an inner area 6 at the bottom and an outer area 5 at the top of a housing 3 of an electrical machine not shown in detail.

[0055] The coupling element 1, arranged in a housing opening 2 of the housing 3, has a base plate 7 which has a connection area 8 facing the outer surface 5, with two electrical coupling connection points 9. A first guide wall 10 of the coupling element 1 frames the connection area 8 and projects from the base plate 7 to the outer surface 5. The coupling element 1 is designed such that the plug 11 inserted into the coupling element 1 is guided. Two plug connection points 12 of the plug 11 come into contact with the respective coupling connection point 9, with the two plug connection points 12 entering the area framed by the first guide wall 10. The base plate 7 has a through-opening 13.

[0056] Reliable and simple pressure equalization between the inner area 6 and the outer area 5 is ensured in particular by the fact that the first through-opening 13 is arranged in the connection area 8 and allows pressure equalization between the inner area 6 and the connection area 8. In addition, the coupling element 1 has a second through-opening 14, which is arranged in the first guide wall 10 and which is covered by the plug 11 when a plug 11 is inserted, thus allowing pressure equalization between the connection area 8 and the outer area 5.

[0057] The connector 11 has a connector connection area 25 with the two connector connection points 12 and a second guide wall 26, which frames the connector connection area 25 and projects from it. The second guide wall 26 surrounds the first guide wall 10, at least partially, when the connector 11 is plugged into the coupling element 1. To support the pressure equalization described above, the second guide wall 26 is designed such that, when the connector 11 is plugged into the coupling element 1, it covers the second through-opening 14 and allows pressure equalization between the connection area 8 and the outer area 5.

[0058] The first through-channel 19, which extends along the first guide wall 10 between the second through-opening 14 and the outer surface 5, is particularly advantageous for pressure equalization. The first through-channel 19 can, for example, be designed as a groove or notch on the outside of the first guide wall 10.

[0059] Fig. Figure 2 shows a second comparative example of the proposed connector 40. Same reference numerals as in Fig. The numbers 1 and 2 refer to identical objects. Since the second example has some similarities to the first, some differences are explained below.

[0060] Instead of the first through-channel 19, the connector 40 has a second through-channel 27, which extends along the second guide wall 26 between the second through-opening 14 and the outer surface 5. The second through-channel 27 can, for example, be designed as a groove or notch on the inside of the second guide wall 26.

[0061] In principle, it can also be provided that the connector 40 has both a first through-channel 19, as in the first comparative example, and a second through-channel 27, as in the present second comparative example.

[0062] The Fig. 3 and Fig. Figure 4 shows a third comparative example of the proposed connector 40. Since the third comparative example has some similarities to the first and second comparative examples, some differences are explained below.

[0063] The coupling element 1 has a pressure equalization element 15 comprising a membrane 16 in the area of ​​the second through-opening 14. The membrane 16 can, for example, be air-permeable and / or water-impermeable, in particular splash-proof. Alternatively or additionally, the membrane 16 can be semi-permeable.

[0064] Furthermore, the coupling element 12 has locking elements 18 by means of which the attached plug 11 can be locked. For this purpose, the plug 11 is preferably designed accordingly.

[0065] As in Fig. As indicated by the dashed lines, the plug 11, which is attached to the coupling element 1, covers the second through-opening 14 and thus also the pressure equalization element 15 and the membrane 16 by means of its second guide wall 26.

[0066] The connector 40 according to the third comparative example has both a first through-channel 19 along the first guide wall 10 and a second through-channel 27 along the second guide wall 26, each extending between the second through-opening 14 and the outer area 5. The second through-channel 27 is shown with a dashed line because it is located on the inside of the second guide wall 26.

[0067] The Fig. 5 and Fig. Figure 6 shows an embodiment of the proposed connector 40. Since this embodiment has some similarities to the first and second comparative examples, some differences are explained below.

[0068] The coupling element 1 has a first through-channel 19 on the outside of the first guide wall 10, which is connected to the second through-opening 14.

[0069] As in Fig. As indicated by the dashed lines in Figure 6, the plug 11, which is attached to the coupling element 1, covers the second through-opening 14 and partially the first through-channel 19 by means of a second guide wall 26. On the inside of the second guide wall 26, the plug 11 has a second through-channel 27, which is connected to a third through-opening 28 through the second guide wall 26.

[0070] Fig. Figure 7 shows a fourth comparative example of the proposed connector 40. Since the fourth comparative example has some similarities to the first comparative example, some differences are explained below.

[0071] The base plate 7 has a further connection area 20, which faces the inner area 6 and has two further electrical coupling connection points 21. Furthermore, the coupling element has a third guide wall 23, which frames the further connection area 20 and projects from the base plate 7 towards the inner area 6. The coupling element 1 is designed such that the further plug 23, which is inserted into the coupling element 1, is guided. This plug 23 has two further plug connection points 24 on a further plug connection area 31. The two further plug connection points 24 of the further plug 23 come into contact with the respective further coupling connection point 21 when they are inserted into the area framed by the third guide wall 22.

[0072] To ensure pressure equalization between the interior 6 and the further connection area 20, a fourth through-opening 30 can be provided in the further connector 23, as shown in Fig. 6 indicated.

[0073] Fig. Figure 8 shows a fifth comparative example of the proposed connector 40. Since the fifth comparative example has some similarities to the fourth comparative example, some differences are explained below.

[0074] The additional connector 23 has a further connector connection point 24, which is in contact with the further coupling connection point 21 of the coupling element 1. The additional connector 21 engages in the area framed by the second guide wall 22. For the sake of clarity, the following is shown in the Fig. 7. A representation of the additional connection area 20 and the additional plug connection area 31, which is also present, has been omitted.

[0075] In the fourth comparative example, pressure equalization between the interior 6 and the connection area 8 can occur directly through the first through-opening 13, which is not covered by the further connector. Therefore, it is not necessary for the further connector 23 or the second guide wall 22 to have a special design to enable pressure equalization.

[0076] In principle, several such additional plugs 23 can also be provided, none of which obscures the first through-hole 13.

[0077] Fig.Figure 9 shows an embodiment of the proposed vehicle 29. The vehicle 29 is designed, in particular, as an electric or hybrid vehicle and comprises an electric machine 4, which is, for example, designed as an electric motor or inverter. The electric machine 4 has a housing 3, which has a housing opening 2 and is closed except for the housing opening 2. Furthermore, the electric machine 4 has a plug connection 40 with a coupling element 1 and a plug 11 for conducting electrical contacts through the housing opening 2 from an outer area 5 to an inner area 6.

Claims

[1] Plug connection (40), in particular for passing electrical contacts through a housing opening (2) of a housing (3) of an electrical machine (4) from an outside area (5) to an inside area (6), wherein the connector (40) has a coupling element (1) and a plug (11) for plugging onto the coupling element (1), wherein the coupling element (1) comprises: - a base plate (7) with a first side that is arranged on the outer surface (5) when the plug connection (40) is arranged on the housing (3), and a second side that is opposite the first side and is arranged on the inner surface (6) when the plug connection (40) is arranged on the housing (3), wherein the base plate (7) has on its first side a connection area (8) with at least one electrical coupling connection point (9), - a first guide wall (10), which is arranged on the first side, frames the connection area (8) and, when the plug connection (40) is arranged on the housing (3), projects from the base plate (7) to the outside (5), - a first through-opening (13) through the base plate (7), wherein the first through-opening (13) is arranged in the connection area (8) and allows pressure equalization between the interior (6) and the connection area (8) when the plug connection (40) is arranged on the housing (3), - a second through-opening (14) which is arranged in the first guide wall (10); wherein the plug (11) has: - a plug connection area (25) with at least one plug connection point (12) and - a second guide wall (26); wherein the plug connection (40) is designed such that when the plug (11) is inserted onto the coupling element (1) - the plug (11) is guided by guiding the second guide wall (26) along the first guide wall (10), and - at least one plug connection point (12) is inserted into an area framed by the first guide wall (10) and comes into contact with at least one coupling connection point (9); wherein the second guide wall (26) - frames the plug connector area (25) and protrudes from the plug connector area (25), - when the plug (11) is inserted onto the coupling element (1), the first guide wall (10) surrounds at least section by section, - is designed such that, when the plug (11) is inserted onto the coupling element (1), it covers the second through-opening (14) and allows pressure equalization between the connection area (8) and the outside (5) when the plug connection (40) is arranged on the housing (3); wherein the plug connection (40) has at least one through-channel (19, 27) which extends along the first guide wall (10) and / or along the second guide wall (26) and extends at least between the second through-opening (14) and the outside (5) when the plug connection (40) is arranged on the housing; characterized by, that the second guide wall (26) is designed such that, when the plug (11) is inserted onto the coupling element (1), at least one of the at least one through-channel (27) extends along the inside of the second guide wall (26) away from the second through-opening (14) between the first guide wall (10) and the second guide wall (26); wherein the second guide wall (26) has a third through-opening (28); wherein the second through-opening (14) is completely covered by the second guide wall (26) when the plug (11) is inserted onto the coupling element (1). [2] Plug connection (40) according to claim 1, wherein at least one of the at least one through channel (27) is designed as a groove on the inside of the second guide wall (26). [3] Plug connection (40) according to claim 1 or 2, wherein the coupling element (1) in the area of ​​the second through-opening (14) has a pressure equalization element (15) comprising a membrane (16) which is permeable to air and / or water, in particular splash-proof. [4] Plug connection (40) according to claim 1 or 2, wherein the coupling element (1) in the area of ​​the second through-opening (14) has a pressure equalization element (15) comprising a membrane (16) which is semipermeable. [5] Plug connection (40) according to one of the preceding claims, wherein the coupling element (1) has a sealing element (17) by means of which the coupling element (1) is sealed on its outside against the housing (3) when the coupling element (1) is installed in the housing opening (2). [6] Connector (40) according to one of the preceding claims, wherein the coupling element (1) has a locking element (18) for locking the plugged-on connector (11). [7] Plug connection (40) according to one of the preceding claims, wherein the first guide wall (10) is designed such that, when the plug (11) is inserted onto the coupling element (1), at least one further of the at least one through channel (19) extends along the outside of the first guide wall (10) away from the second through opening (14) between the first guide wall (10) and the second guide wall (26). [8] Plug connection (40) according to claim 7, wherein the at least one further of the at least one through channel (19) is designed as a groove on the outside of the first guide wall (10). [9] Connector (40) according to one of the preceding claims, wherein the base plate (7) has on its second side a further connection area (20) with at least one further electrical coupling connection point (21), wherein the coupling element (1) has a third guide wall (22) which is arranged on the second side, frames the further connection area (20) and, when the connector (40) is arranged on the housing (3), projects from the base plate (7) to the inner area (6), wherein the connector (40) has a further plug (23) for insertion into or insertion onto the coupling element (1), wherein the coupling element (1) is configured such thatthat when the additional plug (23) is inserted into the coupling element (1) or when the additional plug (23) is attached to the coupling element (1), the additional plug (23) is guided along the third guide wall (22) and at least one further plug connection point (24) of the additional plug (23) is inserted into an area framed by the third guide wall (22) and comes into contact with at least one further coupling connection point (21). [10] Electric machine (4), in particular electric motor or inverter, comprising: - a housing (3) which has a housing opening (2) and is closed apart from the housing opening (2), - a plug connection (40) according to one of the preceding claims. [11] Vehicle (29), in particular an electric or hybrid vehicle, comprising an electric machine (4) according to claim 10 for propulsion of the vehicle.

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