High-voltage contactor with joining groove

Abstract

High-voltage contactor (10) with an electromagnetic actuator (12) with a coil (14) and a ferromagnetic armature (22) movable through the coil (14), a housing (58) comprising a housing body (89) and a housing cover (88) which together enclose a contact chamber (42), an electrically conductive contact bridge (44) arranged in the contact chamber (42), which can be moved by means of the actuator (12) into a contact position in which a first housing-fixed contact element (54) is electrically connected to a second housing-fixed contact element (56) via the contact bridge (44), and can be moved into an open position in which an electrical contact between the first contact element (54) and the second contact element (56) is interrupted, wherein the housing cover (88) is gas-tightly connected to the housing body (60) by means of an ultrasonic welding connection, and wherein the housing cover (88) has a joining groove (94) into which a housing body wall (86) projects, wherein a weld joint (85) of the ultrasonic weld connection is formed by the joining groove (94) and the housing body wall (86).

Description

[0001] The present invention relates to a high-voltage contactor or high-voltage relay with an electromagnetic actuator with a coil, a movable armature, a housing with a contact chamber, and a contact bridge which can be moved by means of the actuator in the contact chamber into a first position, the contact position, in which a first contact element fixed to the housing is electrically connected to a second contact element fixed to the housing via the contact bridge, and into a second position, the open position, in which an electrical contact between the first contact element and the second contact element is interrupted.

[0002] Such high-voltage contactors are required to be able to establish and disconnect electrical connections in the no-load case or in the load case, where voltages of more than 1000 V and currents of more than 1000 A can occur in the load case, which can occur, for example, in an electric motor-driven vehicle between the traction battery and the drive motor or between a charging station and the traction battery.

[0003] The housing of such a high-voltage contactor is typically gas-tight, preventing gas exchange with the environment. The contact chamber, in particular, is gas-tight, which is advantageous for extinguishing arcs that occur when the contact bridge is separated from the contact elements.

[0004] The present invention is based on the object of creating a high-voltage contactor with a gas-tight housing that can be manufactured relatively inexpensively.

[0005] This object is achieved according to the invention by a high-voltage contactor having the features of claim 1.

[0006] For simplicity, the term "high-voltage contactor" will be used below, although this also includes a high-voltage relay. Furthermore, the terms "radial," "axial," and "diametrical" refer to the actuator's center axis along which the actuator's armature can move linearly.

[0007] The high-voltage contactor according to the invention has a linear electromagnetic actuator. In this context, an electromagnetic actuator is understood to be any actuator that generates a linear movement due to a force caused by electromagnetism. The electromagnetic actuator comprises a coil, which preferably consists of a coil carrier and a winding wound thereon, as well as a ferromagnetic armature that is movable due to the electromagnetic force of the activated actuator and is arranged, for example, within the coil.

[0008] The high-voltage contactor further comprises a multi-part housing, preferably made of plastic, with a housing body and a housing cover, which together enclose a contact chamber arranged axially adjacent to the actuator. The housing cover encloses the contact chamber at the axial end face, with the remaining contact chamber walls bounding the contact chamber being formed by the housing body, the contact chamber walls being connected to one another in an airtight manner. Preferably, the contact chamber walls on the housing body side are connected to one another in one piece.

[0009] The high-voltage contactor has a first and second contact element fixedly mounted on the housing. Both of these contact elements extend into the contact chamber and can each be permanently connected to a busbar outside the high-voltage contactor. In a motor vehicle, one of these contact elements can lead to a traction battery, while the other, for example, can lead to power electronics for an electric vehicle drive motor or can be connected to an external charging station. An electrical connection between these two contact elements can be established, if required, via a contact bridge, which is moved along a linear motion axis in the contact chamber by the actuator.In this case, the contact bridge, at the ends of which two electrical contacts can be formed, is usually moved axially against the two contact elements fastened to the housing by energizing a coil winding of the electromagnetic actuator in order to establish, in a first position, the contact position, an almost resistance-free electrical connection between the first contact element and the second contact element via the contact bridge.

[0010] To open the electrical connection, the electromagnetic actuator is electrically deactivated so that the contact bridge is moved into its open position, in which the electrical connection between the first contact element and the second contact element is interrupted.

[0011] The housing cover is connected to the housing body by means of an internal welded joint, ensuring a gas-tight seal between the contact chamber and the environment. Consequently, no gas / air exchange or pressure equalization with the environment occurs. At most, a negligible gas / air exchange may occur as a result of diffusion processes. When an arc is formed, a relatively high gas pressure is suddenly generated in the contact chamber compared to the environment. This pressure cannot be immediately compensated or reduced due to the lack of gas / air exchange and pressure equalization between the contact chamber and the environment. However, the high gas pressure promotes arc extinguishing.

[0012] The gas-tight and preferably internal welded joint can be created using an ultrasonic welding process. A so-called sonotrode of an ultrasonic welding device is placed on the outside of the housing. This sonotrode generates friction in the material by introducing ultrasonic waves, thus heating it. The introduction should occur at a relatively short distance from a weld joint, which is why the sonotrode must be positioned relatively close to the joint. The distance should be less than 6 mm.

[0013] According to the invention, the housing cover has a joining groove into which a housing body wall projects, wherein a weld joint of the ultrasonic weld is formed by the joining groove and the housing body wall. For this purpose, the housing body wall engages in the joining groove as a so-called tongue according to the tongue and groove principle. For this purpose, the housing body wall preferably lies axially directly in the joining groove. By means of a sonotrode, sound waves are preferably introduced axially into the housing, which generate friction in the weld joint so that the housing body wall and the housing cover melt and weld together in the region of the joining groove. An internal weld seam is thus formed in the joining groove because the ultrasonic waves can be guided from the outside through the housing wall to the weld joint, whereby with the help of the joining groove a precise and even weld seam can be produced.

[0014] The housing body wall preferably has an energy concentration structure at which the material is first melted during the welding process. The energy concentration structure, which is often also referred to as an energy director, is arranged at the axial end of the housing body wall and has a preferably sharp-edged geometry designed to concentrate the energy introduced by the sonotrode using ultrasonic waves and thus melt the joint relatively quickly and with relatively little energy input. The energy director is preferably roof-shaped, i.e., has a triangular or V-shaped cross-section and tapers in the direction of the weld joint, so that the energy director preferably rests axially with the pointed, sharp-edged part in the joint groove.Here, the energy director extends completely along the housing wall and thus along the entire weld joint. The tip angle of the energy director in the contact area is particularly preferably 60° to 90°, which allows for relatively rapid welding of the materials. This allows the welding process to be easily and cost-effectively automated.

[0015] In a particularly preferred embodiment of the invention, the housing cover wall has a circumferential and radially extending end wall section on which an axial end face is formed, wherein the joining groove is formed in the end face. The axial end face faces axially towards the housing body wall, so that this is referred to below as the inner end face. The joining groove extends in the axial direction from the end face axially into the end wall section. In the circumferential direction, the joining groove extends in a ring-shaped and circumferential manner, wherein its contour corresponds to the contour of the radial housing body wall. Consequently, the housing cover can be placed axially onto the housing body, whereby assembly is relatively simple and cost-effective.

[0016] In another particularly preferred embodiment of the invention, the housing body wall has a radial contact chamber wall that completely radially encloses the contact chamber. The contact chamber wall is preferably formed integrally with the housing body wall, allowing the housing body to be manufactured entirely in a single plastic injection molding process.

[0017] In another particularly preferred embodiment of the invention, the joining groove has a groove base, wherein the groove base is preferably formed as a flat surface. The housing body wall with the preferably sharp-edged energy director thus does not fully contact the groove base. Instead, a linear contact occurs, which promotes the melting of the materials. Particularly preferably, the joining groove has a U-shaped profile. Alternatively, the joining groove can also have other shapes, for example, a semicircle or a trapezoid.

[0018] In a further preferred embodiment of the invention, the housing cover has a circumferential collar which extends radially outward in the axial direction over a contact chamber wall which completely radially encloses the contact chamber. The collar is thus annular and completely encloses the housing cover. In addition, the collar extends in the axial direction preferably over at least 20% of the total height of the high-voltage contactor. The contact chamber wall extends in the axial direction over the entire axial height of the contact chamber and completely encloses the contact chamber in the circumferential direction. The collar extends over approximately 50% of the height of the contact chamber in the axial direction, so that the collar protruding over the contact chamber wall additionally reinforces the contact chamber wall, whereby the housing is particularly well protected against bursting due to the high gas pressures which arise when arcs occur.

[0019] In a further embodiment of the invention, the housing cover wall, which has the ultrasonic wave introduction surface, has a circumferential and radially extending end wall section to which the circumferential collar is connected. The end wall section is preferably annular and extends radially inward from the collar. The collar is preferably formed integrally with the end wall section, making the housing cover relatively stable and able to withstand the high loads caused by the gas pressures in the contact chamber.

[0020] Particularly preferably, the axial end face is radially enclosed by the collar. Consequently, the collar also encloses the joining groove, so that the joining groove is not accessible from the outside. Thus, after the welded joint has been created, the collar encloses the weld joint or weld seam, creating an internal welded joint with a particularly high degree of tightness.

[0021] Particularly preferably, the joining groove borders on a radial inner wall of the collar, whereby the collar is arranged adjacent to the contact chamber wall, thus creating a particularly stable housing. In this case, a gap is formed between the housing body wall and the joining groove, both radially on the inside and radially on the outside, into which gap the molten metal can flow during the welding process. This radial gap preferably has a width of 0.05 mm to 0.5 mm. In addition, the collar serves as a guide during the assembly process to guide the housing body wall into the joining groove when the housing cover is placed on. For this purpose, an inner wall of the collar can also be slightly inclined so that the opening formed by the collar widens outwards, which further simplifies the placement of the housing cover.

[0022] In a particularly advantageous embodiment of the invention, the radial contact chamber wall protrudes axially into the joining groove, with the weld joint formed by the radial contact chamber wall and the joining groove. This allows the housing cover to be placed axially onto the free end of the radial contact chamber wall during assembly, with the engagement of the contact chamber wall and the joining groove of the housing cover being precisely and securely aligned with the housing body.

[0023] In a further particularly advantageous embodiment of the invention, the housing cover wall has an ultrasonic wave introduction surface arranged on a first axial wall side of the housing cover wall, wherein the joining groove is arranged on a second wall side of the housing cover wall axially opposite the first wall side and axially opposite the ultrasonic wave introduction surface. The sonotrode can be placed on the ultrasonic wave introduction surface, which generates the ultrasonic waves and preferably introduces them axially into the housing cover so that they reach the weld joint formed in the joining groove via a relatively short path. The wall thickness of the housing cover wall in the region of the ultrasonic wave introduction surface is a few millimeters, preferably less than 5 mm.Consequently, the distance between the weld joint and the ultrasonic wave introduction surface corresponds to the wall thickness of the housing cover wall in between, so that the ultrasonic waves are introduced in the immediate vicinity of the joint, creating a reliable and tight weld.

[0024] An embodiment of the present invention is described below with reference to the accompanying figures. Herein: Fig. 1 a high-voltage contactor according to the invention in a sectional view from the front, showing the state before ultrasonic welding, and Fig. 2 an enlarged detailed view of the welding joint of the high-voltage contactor of the Fig. 1.

[0025] The Fig. The high-voltage contactor 10 or high-voltage relay shown in Figure 1 is used, for example, in an electrically powered motor vehicle for the electrical isolation or connection of a traction battery from or to other electrical components as required. The high-voltage contactor 10 comprises an electromagnetic actuator 12 having a coil 14 consisting of a coil carrier 16 and a winding 18 wound thereon, a ferromagnetic iron circuit 20, and an armature 22. The ferromagnetic iron circuit 20 has a U-shaped yoke 24, the legs 26 of which rest on a return plate 28 or are fastened to the return plate 28, thus forming the closed iron circuit 20.

[0026] The yoke 24, which forms the electromagnetic return path, has a central opening 32 at its base part 30, the diameter of which essentially corresponds to the inner diameter of the coil carrier 16. A bushing 34 is fastened in this opening 32, in which the armature 22 is slidably arranged and guided. When current is applied to the coil 14, the armature 22 is pulled into its closed position in a known manner against the force of a return spring 36 in the contact chamber 42 toward the return plate 28. The distal end of the return spring 36 is axially supported and radially guided in a spring support chamber 110 of the housing.

[0027] On the contact chamber side of the armature 22, on its proximal flat end face 221, there is a one-piece actuating rod 38 which projects through a further central opening 40 in the return plate 28 into a contact chamber 42.

[0028] A contact bridge 44 is arranged at the end 382 of the actuating rod 38 opposite the armature 22. The contact bridge 44 is pressed against a stop 48 at the contact bridge-side end 382 of the actuating rod 38 by a spring element 46 designed as a helical spring, with the other spring end of the spring element 46 being axially supported on a shoulder 49 on the actuating rod 38. The shoulder 49 is formed by an annular disk welded to the actuating rod 38 by a weld 49'. In this way, the contact bridge 44 is tiltable and axially movable against the spring force of the spring element 46 and is held on the actuating rod 38. The stop 48 also serves, on its distal side, to center the proximal end of the return spring 36.Alternatively, the spring element can also be designed as a leaf spring which is supported centrally on the shoulder 49 and whose two leaf spring ends introduce the spring force at the two contact bridge ends.

[0029] Attached to each end of the contact bridge 44 is a contact plate 52, 53 made of a material with particularly good electrical conductivity. The first contact plate 52 is arranged axially opposite a first contact element 54, which can be connected, in particular, to a traction high-voltage battery via a busbar (not shown). The second contact plate 53 is arranged opposite a second contact element 56, which can be connected, for example, to an electric drive motor of a motor vehicle via a busbar.

[0030] The entire high-voltage contactor 10 is arranged in a housing 58 made of plastic, which is formed from a housing body 60 and a housing cover 88, as shown in particular in Fig. 1. The actuator 12 is overmolded with a plastic to form the housing body 60. This plastic completely surrounds the coil 14 radially to form a radial boundary wall 66 and also fills a gap 68 radially between the coil 14 and the yoke 24. In addition, the yoke 24 itself is completely radially surrounded by this plastic and is thus shielded from the environment. Furthermore, the return plate 28, which rests against the coil carrier 16 on its side facing the coil carrier, is covered axially by this plastic in the direction of the contact chamber 42, thereby forming an axial contact chamber wall 45. The opening 40 of the return plate 28 is also covered radially inward by the plastic and leaves only a central guide opening 70 free, in which the actuating rod 38 is guided.

[0031] On the axial outer side 72 of the housing body 60 opposite the contact chamber 42, the plastic extends further radially inward along a radially outer region 74 of the base part 30 of the yoke 24 or of the actuator 12 and leaves an opening 78 free only in the central, radially inner region 76, which opening is designed symmetrically to the opening 32 but has a slightly larger diameter so that there is sufficient space for pressing in the socket 34.

[0032] This opening 78 is closed by a plastic cover 80, which is firmly attached to the housing body 60 in the opening 78, in particular by laser welding, ultrasonic welding or rotational vibration welding.

[0033] Furthermore, the housing body 60 produced by overmolding the actuator 12 forms a formation 82 in the form of a plug housing 82, through which the connecting lines 84 to the winding 18 of the coil 14 are led outwards, so that the electrical connection of the coil 14 to a voltage source can be established via a plug counterpart.

[0034] In addition, a circumferential radial contact chamber wall 47 extends from the return plate 28 in extension of the plastic surrounding the actuator 12, which radially delimits the contact chamber 42 and is also manufactured in one piece during the overmolding of the actuator 12 and thus forms four side walls of the contact chamber 42 in the present exemplary embodiment.

[0035] The radial contact chamber wall 47 is designed in a so-called sandwich construction. The radial contact chamber wall 47 is formed by a contact chamber inner wall 474 and a contact chamber outer wall 476, which are spaced apart and arranged parallel to one another. Between the contact chamber inner wall 474 and the contact chamber outer wall 476, a magnetic field guide body 50 formed by a ferromagnetic magnetic field guide plate 51 is arranged, which completely radially surrounds the contact chamber 42. The radial contact chamber wall 47, the contact chamber inner wall 474, and the contact chamber outer wall 476 are manufactured by overmolding the magnetic field guide plate 51 with plastic on the inside and outside, respectively.The overmolding takes place in the same work step in which the actuator 12 is overmolding, whereby the contact chamber outer wall 476 is formed integrally with the housing body 60 and the contact chamber inner wall 474 is formed integrally with the axial contact chamber wall 45. Nevertheless, the contact chamber inner wall 474 and the contact chamber outer wall 476 are integrally connected to one another at several points, for example, by openings 512 in the long side walls 506 of the magnetic field guide plate 51.

[0036] The contact chamber 42 is cuboid-shaped and therefore has a rectangular cross-section, which is radially delimited by four side walls each formed by the radial contact chamber wall 47. On the two opposing short sides, the side walls of the contact chamber wall 47 each have a cuboid-shaped, inwardly projecting pocket 471, 472, which is open to the axial side opposite the actuator 12, with a permanent magnet 55, 57 arranged in each pocket 471, 472. Each pocket 471, 472 or each permanent magnet 55, 57 arranged in the pocket 471, 472 is arranged radially adjacent to one of the contact plates 52, 53 of the contact bridge 44.Each permanent magnet 55, 57 is aligned with respect to its magnetic poles in such a way that the Lorentz force exerted by the magnetic fields of the permanent magnets 55, 57 deforms the arc occurring between the contact plates 52, 53 and the contact elements 54, 56 into an arc and thus extinguishes the arcs due to the resulting elongation and faster cooling.

[0037] The magnetic field guide plate 51 is not completely overmolded on the inside in the area of ​​the pockets 471, 472. Instead, each permanent magnet 55, 57 contacts the magnetic field guide plate 51 on its respective short inner side, thereby magnetically connecting the permanent magnets 55, 57 to one another. Arranged within each pocket 471, 472 is a stop structure 475, each formed by two parallel and spaced-apart ribs 477 and a wall projection 478. The wall projection 478 projects radially inward from the inside of the magnetic field guide plate 51. The ribs 477 each extend radially from the contact chamber inner wall 474 to the wall projection 478. The permanent magnets 55, 57 rest axially against the respective stop structure 475, whereby each permanent magnet 55, 57 is arranged at the level of one of the contact points in the contact chamber 42 with respect to the axial direction.

[0038] In addition, the magnetic field guide plate 51 extends axially in the actuator direction up to the return plate 28 and rests axially against the return plate 28 with a flat contact surface 504, so that the magnetic field guide plate 51 is in direct, magnetically conductive contact with the return plate 28 and thus with the iron circuit 20. This leads to both an increased local field strength and improved homogeneity of the magnetic field, thereby achieving a relatively strong deformation of the arcs and thus a relatively rapid extinguishing of the arcs.

[0039] The magnetic field guide plate 51 is shaped like a rectangular tube and is made from a flat sheet metal strip by bending. The magnetic field guide plate 51 has four bending points 507, which form the corners of the magnetic field guide plate 51.

[0040] The contact chamber 42 in Fig. 1 is axially closed on the axial side opposite the axial contact chamber wall 45 by the housing cover 88, which also axially closes the pockets 471, 472. Two axial openings 90 are formed on the housing cover 88, in which the two contact elements 54, 56 are received and secured, for example, by overmolding.

[0041] The housing cover 88 is connected to the housing body 60 in a gas-tight manner by means of an ultrasonic weld. The housing cover 88 has an ultrasonic wave introduction surface 81 on a housing cover wall 89, which is arranged on a first wall side 891 of the housing cover wall 89. A weld joint 85 of the ultrasonic weld is arranged on a second wall side 892 of the housing cover wall 89, opposite the first wall side 891, opposite the ultrasonic wave introduction surface 81.

[0042] The housing cover wall 89 is formed by a circumferential and radially extending end wall section 83, which is annular in shape and from which a circumferential collar 92 extends in the axial direction toward the actuator 12. The collar 92 radially encloses the contact chamber wall 47 and extends over approximately 50% of the contact chamber height. The end wall section 83 has an axial end face 831 on an outer side of the housing cover 88, which faces away from the collar 92, wherein the ultrasonic wave introduction surface 81 is formed by the axial end face 831.

[0043] The axial end face 831 is arranged at right angles to the central axis M of the actuator 12 and thus at right angles to the axial mounting direction of the housing cover 88. The end wall section 83 also has an inner axial end face 832, which is enclosed by the collar 92, as also in Fig. 2. The inner axial end face 832 has an axial joining groove 94, into which the contact chamber wall 47, in particular the contact chamber outer wall 476, projects axially with its distal end. The contact chamber wall 47 has a so-called energy director 87, which has a triangular or V-shaped profile. The energy director 87 thus tapers sharply towards a groove base 91 of the joining groove 94, so that the energy director 87 axially bears against the groove base 91 of the joining groove 94 with a linear contact. The tip angle α of the energy director 87 is approximately 90°.

[0044] The joining groove 94 extends radially inwardly of the collar 92 and borders it. Furthermore, the joining groove 94 has a U-shaped profile, as shown in Fig.2 can be seen. The flat groove base 91, together with the energy director 87, forms the weld joint 85, at which the housing cover 88 is welded to the housing body 60. In the axial direction, the joining groove 94 is arranged axially adjacent to the ultrasonic wave introduction surface 81, so that the sound waves of the sonotrode, which is placed axially on the ultrasonic wave introduction surface 81, can be axially introduced to produce the ultrasonic weld on the axially opposite wall side of the weld joint 85 and propagate axially through the end wall section 83 to the weld joint 85, so that a particularly uniform and tight weld joint is produced in the joining groove 94.

[0045] In addition, the housing body 60 has an axially acting stop 59, which is designed as a radially extending projection 591. An axial stop surface 592 is formed on the projection 591, which is arranged perpendicular to the central axis M. By means of this stop surface, the housing body 60 axially rests against a corresponding receiving device during the ultrasonic welding process. The stop 59 serves as a counterholder when the sonotrode is placed axially on the ultrasonic wave introduction surface 81 to carry out the welding process.

[0046] If the flow of current between the traction electric motor or the charging station and the traction battery is to be enabled, the coil 14 is energized, whereby the ferromagnetic armature 22 is pulled towards the return plate 28 due to the acting electromagnetic forces. As a result, the actuating rod 38 with the contact bridge 44 and the contact plates 52, 53 is pushed against the contact elements 54, 56 so that an electric current can flow via the contact bridge 44 from the first contact element 54 to the second contact element 56 and thus from the battery to the electric motor or from the charging station to the battery. If the coil 14 is not energized, the actuating rod 38 and the armature 22 are moved by the spring force of the return spring 36 in the opposite direction to the previously acting closing force, so that the contact bridge 44 is lifted off the contact elements 54, 56 and the circuit is interrupted.At high currents, an arc is created, which also results in an increase in pressure in the contact chamber 42.

[0047] This pressure increase can be well absorbed by the housing 58 due to the metal-reinforced walls 45, 47 surrounding the contact chamber 42, and the actuator 12 is also reliably protected, particularly by the molded-on axial contact chamber wall 45. The tight welding of the only three housing parts also ensures complete sealing to the outside, so that no gas can escape from the contact chamber 42, the arc is extinguished reliably and quickly, and no gases or liquids can penetrate from the outside. The required installation space and assembly costs are very low.

Claims

[1] High-voltage contactor (10) with an electromagnetic actuator (12) with a coil (14) and a ferromagnetic armature (22) movable by the coil (14), a housing (58) with a housing body (89) and a housing cover (88) which together enclose a contact chamber (42), an electrically conductive contact bridge (44) arranged in the contact chamber (42), which can be moved by means of the actuator (12) into a contact position in which a first contact element (54) fixed to the housing is electrically connected to a second contact element (56) fixed to the housing via the contact bridge (44), and can be moved into an open position in which an electrical contact between the first contact element (54) and the second contact element (56) is interrupted, wherein the housing cover (88) is connected to the housing body (60) in a gas-tight manner by means of an ultrasonic welding connection, and wherein the housing cover (88) has a joining groove (94) into which a housing body wall (86) projects, wherein a weld joint (85) of the ultrasonic weld is formed by the joining groove (94) and the housing body wall (86). [2] High-voltage contactor (10) according to claim 1, wherein the housing body wall (86) has an energy concentration structure (87) which preferably has a V-shaped profile. [3] High-voltage contactor (10) according to claim 1 or 2, wherein the housing cover wall (89) has a circumferential and radially extending end wall section (83) on which an axial end face (832) is formed, wherein the joining groove (94) is formed in the end face (832). [4] High-voltage contactor (10) according to one of the preceding claims, wherein the housing body wall (86) has a radial contact chamber wall (47) which completely radially encloses the contact chamber (42). [5] High-voltage contactor (10) according to one of the preceding claims, wherein the joining groove (94) has a groove base (91), and wherein the groove base (91) is formed as a flat surface. [6] High-voltage contactor (10) according to claim 5, wherein the joining groove (94) has a U-shaped profile. [7] High-voltage contactor (10) according to one of claims 4-6, wherein the housing cover (88) has a circumferential collar (92) which extends radially outwardly over the contact chamber wall (47) in the axial direction. [8] High-voltage contactor (10) according to claim 7, wherein the circumferential collar (92) is connected to the radially extending end wall section (83). [9] High-voltage contactor (10) according to claim 7 or 8, wherein the axial end face (832) is radially enclosed by the collar (92). [10] High-voltage contactor (10) according to one of claims 7-9, wherein the joining groove (94) adjoins a radial inner wall of the collar (92). [11] High-voltage contactor (10) according to one of claims 4-10, wherein the radial contact chamber wall (47) projects axially into the joining groove (94) and the weld joint is formed by the radial contact chamber wall (47) and the joining groove (94). [12] High-voltage contactor (10) according to one of the preceding claims, wherein the housing cover wall (89) has the ultrasonic wave introduction surface (81) which is arranged on a first axial wall side (891) of the housing cover wall (89), and wherein the joining groove (94) is arranged on a second wall side (892) of the housing cover wall (89) axially opposite the first wall side (891) and axially opposite the ultrasonic wave introduction surface (81).

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