DOUBLE BUSBAR WITH ONE CONTACT DEVICE AND CONTACT SYSTEM FOR TWO DOUBLE BUSBARS

Description

Technical area

[0001] The present invention relates to a double busbar with a contact device and a contact system for two double busbars. State of the art

[0002] The present invention will be described below primarily in connection with vehicle electrical systems. However, the invention can be used in any application in which electrical loads are transmitted, especially large electrical loads with significant power outputs of, for example, more than 10 kW or with significant voltages of, for example, more than 100 V.

[0003] In a vehicle's low-voltage electrical system, electrically conductive sheet metal from a vehicle body can be used as a ground, which can shorten the length of return lines. This eliminates approximately half of all the cables in the vehicle.

[0004] To transmit large electrical loads, automotive high-voltage voltages of, for example, more than 300V or even more than 700V can be used. Busbars made of solid metal material can be used for automotive high-voltage voltages. If busbars are used, separate positive and negative busbars can be used to ensure the required safety (contact protection, protection against arcing or voltage breakdown, etc.). The positive and negative busbars can be designed as double busbars, i.e., lying flat on top of one another with a small gap (<5mm).

[0005] US Pat. No. 9,490,555 B1 describes a first bus structure comprising a first outer conductive layer and a first inner conductive layer separated by a first dielectric layer. A second bus structure comprises a second outer conductive layer and a second inner conductive layer separated by a second dielectric layer. An outer sleeve electrically connects the first inner conductive layer to the second inner conductive layer. An inner sleeve electrically connects the first outer conductive layer to the second outer conductive layer. A fastener extends through the inner sleeve to clamp or compress the first outer conductive layer and the second outer conductive layer against each other. Description of the invention

[0006] An object of the invention is therefore to provide an improved contact device for a double busbar and an improved contact system for two double busbars using the simplest possible design. An improvement may, for example, relate to improved radiation characteristics, in particular reduced radiation of electromagnetic fields.

[0007] The object is achieved by the subject matter of the independent claims. Advantageous developments of the invention are specified in the dependent claims, the description, and the accompanying figures.

[0008] In an electrically powered vehicle, even at automotive high-voltage voltage, large electrical current flows are required to transmit drive power, braking power, or recuperation power. These current flows generate electromagnetic fields around the vehicle's current-carrying conductors. To reduce or even prevent the radiation of these fields, the conductors can be shielded. Alternatively or additionally, the conductors for the forward and return lines can be arranged as parallel and close together as possible, since the electromagnetic fields caused by the opposing current flows cancel each other out.

[0009] With busbars, the busbar for the forward line and the busbar for the return line can also be arranged very close together by stacking the two busbars so they are congruent. The stacked busbars are individually electrically insulated. This arrangement can be referred to as a double busbar.

[0010] In order to maintain the cancellation effect even at contact points, the approach presented here proposes a centrally screwed double socket, which enables coaxial guidance of the current flows even at the contact point.

[0011] A double busbar with a contact device is proposed, wherein the double busbar has a first busbar and a second busbar, which are separated from one another by insulation and stacked one above the other to form a stack, wherein the contact device has an outer contact socket for contacting an outer counter-socket of a counterpart to the contact device and an inner contact socket arranged coaxially in the outer contact socket for contacting an inner counter-socket of the counterpart, wherein the inner contact socket encloses an axial receptacle for a tension rod for exerting an axial tensile force between the contact device and the counterpart, wherein the outer contact socket is arranged on a flat side of the first busbar and is electrically conductively connected to the first busbar,wherein the inner contact socket is electrically conductively connected to the second busbar and penetrates the first busbar, wherein the receptacle penetrates the first busbar and the second busbar, wherein a front-side contact surface of the outer contact socket projects beyond a front-side contact surface of the inner contact socket.

[0012] Furthermore, a contact system for two double busbars is proposed, wherein the double busbars each have a first busbar and a second busbar, which are separated from one another by insulation and are stacked one on top of the other to form a stack, wherein one double busbar has a contact device, wherein the contact device has an outer contact socket for contacting an outer counter-socket of a counterpart to the contact device and an inner contact socket arranged coaxially in the outer contact socket for contacting an inner counter-socket of the counterpart, wherein the inner contact socket encloses an axial receptacle for a tension rod for exerting an axial tensile force between the contact device and the counterpart, wherein the outer contact socket is arranged on a flat side of the first busbar and is electrically conductively connected to the first busbar,wherein the inner contact socket is electrically connected to the second busbar and penetrates the first busbar, wherein the receptacle penetrates the first busbar and the second busbar, and wherein the other double busbar has a counterpart to the contact device, wherein the outer contact socket is electrically connected to an outer counter-socket of the counterpart and forms an outer contact socket pair of the contact system, wherein the inner contact socket is electrically connected at a frontal contact surface to an inner counter-socket of the counterpart and forms an inner contact socket pair of the contact system, wherein a tension rod for exerting an axial tensile force is arranged in the receptacle and draws the contact device and the counterpart together with the tensile force.

[0013] A busbar can be understood as a solid strip of sheet metal. The busbar can be made of an aluminum material or a copper material, for example. Aluminum or aluminum alloys have good electrical conductivity with low weight and low material costs. Copper or copper alloys can have higher electrical conductivity than aluminum or aluminum alloys. In addition, copper or a copper alloy can be oxidation-resistant and have low contact resistance. The busbar can have a rectangular cable cross-section. The busbar can be elongated and have a length of, for example, more than 0.5 m, preferably more than 1 m, and a width of, for example, between 0.5 cm and 10 cm, preferably between 1 cm and 5 cm. The busbar can also have a thickness of, for example, between 1 mm and 10 mm.The busbar can be insulated on all sides, meaning it can be covered with insulation. The insulation can be made of a plastic material, for example. The plastic material can be a thermoplastic. The busbar can be overmolded with the thermoplastic. The insulation can have properties designed for automotive high-voltage voltages of up to 1000 volts DC. In particular, the thickness of the insulation material can ensure dielectric strength against the automotive high-voltage voltage.

[0014] A double busbar can consist of two busbars of identical dimensions. The two busbars can be stacked on top of each other along their flat sides. The busbars can also be spaced slightly apart. The busbars can be aligned congruently. The double busbar can be covered with a plastic material. Alternatively or additionally, the double busbar can be covered with a fabric material. The fabric material can, for example, be wrapped around the double busbar as a fabric tape. The double busbar can also be additionally shielded against the emission of electromagnetic fields by an electrically conductive sheath.

[0015] When installed, one busbar of the double busbar can be connected to a positive potential of the vehicle's high-voltage system. The other busbar of the double busbar can be connected to a negative potential of the vehicle's high-voltage system. Current flows through the two busbars thus flow in opposite directions and are equal in magnitude. Due to the spatial proximity of the busbars in the double busbar, the resulting electromagnetic fields essentially cancel each other out.

[0016] A contact socket can be made of a copper material. The contact socket can be rotationally symmetrical. The contact socket can be essentially hollow-cylindrical. The contact socket can have a connection geometry for electrically conductive connection to the respective busbar.

[0017] The contact sockets are electrically insulated from each other. An insulating bushing can be arranged between the inner contact socket and the outer contact socket. The insulating bushing can be rotationally symmetrical. The insulating bushing can be essentially hollow-cylindrical.

[0018] A mating bushing can be made of a copper material. The mating bushing can be rotationally symmetrical. The mating bushing can be essentially hollow-cylindrical. The mating bushing can have a connection geometry for electrically conductive connection to the respective busbar.

[0019] The mating bushings are electrically insulated from each other. An insulating bushing can be arranged between the inner and outer mating bushings. The insulating bushing can be rotationally symmetrical. The insulating bushing can be essentially hollow-cylindrical.

[0020] A receptacle can be a continuous recess in the inner contact socket and the inner mating socket. A tie rod can consist of a screw and a nut. Washers can be arranged between the backs of the contact device or the mating part and the abutments of the tie rod.

[0021] The contact device and the counterpart can be designed to be diametrically opposed or complementary to each other. The front contact surface of the inner contact socket can be flat.

[0022] The front contact surface of the outer contact socket protrudes beyond the front contact surface of the inner contact socket. The contact device with the protruding outer contact socket can be referred to as the plug of the contact system.

[0023] Alternatively, the front contact surface of the inner contact socket can protrude beyond the front contact surface of the outer contact socket. The contact device with the protruding inner contact socket can be referred to as the header of the contact system.

[0024] The front contact surface of the outer contact socket can be conical. Alternatively or additionally, the front contact surface of the inner contact socket can be conical. A conical shape allows the contact devices to center each other during contact.

[0025] The front contact surface of the outer contact socket can be spherically shaped. Alternatively or additionally, the front contact surface of the inner contact socket can be spherically shaped. A spherical shape allows the contact system to exhibit an angular tolerance. This eliminates the need for the dual current bars to be precisely parallel to each other.

[0026] A laminar strip for contacting the outer mating bushing can be arranged on an inner side of the outer contact bushing. A laminar strip can run in a ring along an inner diameter of the outer contact bushing. The laminar strip can be electrically conductive and electrically conductively connected to the inside of the outer contact bushing. The laminar strip can have resilient laminations. The laminar strip can have a smaller inner diameter than the outer contact bushing. The laminations can be aligned substantially axially to the outer contact bushing. When contact is made by the outer mating bushing, the laminations can be elastically deformed and press against the outer mating bushing with a resulting restoring force. The elasticity of the laminations can compensate for an axial offset and / or an angular offset between the contact device and the counterpart.

[0027] The outer counter bushing can essentially correspond to the outer contact bushing. The outer diameter of the outer counter bushing can be smaller than the inner diameter of the outer contact bushing in the area of ​​the laminar strip. The outer diameter of the outer counter bushing can be larger than the inner diameter of the laminar strip. The counter bushings can be designed without a laminar strip.

[0028] The outer contact socket can have a circumferential groove, i.e. an annular groove, for the laminar strip on the inside. At least part of the laminar strip assigned to the outer contact socket can be accommodated in such a groove. The laminar strip can be fixed axially in the outer contact socket by a groove. The laminar strip of the laminar strip can protrude from the groove into an interior space of the outer contact socket. The laminar strip can be inserted into the groove as a rounded, bent strip with a length corresponding to the circumference of the groove. The laminar strip can be pressed against a base of the groove by a restoring force.

[0029] In the area of ​​the outer lamination strip, an annular gap for the outer mating bushing can be arranged between the outer contact bushing and the inner contact bushing. The gap can be wider than the outer mating bushing. On its inner side, the gap can be limited by the insulation. The gap can be formed by an enlarged inner diameter of the outer contact bushing. The outer mating bushing can be inserted through the gap between the outer contact bushing and the inner contact bushing. This allows the contact system to have a low overall height.

[0030] The lamellae of the lamella band can be elongated, extend substantially parallel to an axial direction of the outer contact socket, and project radially inward at least in some areas beyond an inner surface of the outer contact socket. The lamellae of the lamella band can project radially inward in an elastically resilient manner beyond the inner surface of the outer contact socket.

[0031] The slat belt can have an upper belt, a lower belt, and a plurality of slats arranged transversely between the upper belt and the lower belt. The slat belt can be a stamped and bent part. The slat belt can have slits between the slats. The slat belt can be easily bent through the slits. The slat belt can be connected to each other at both ends in a ladder-like manner. The slats can be pre-bent into an arc.

[0032] The outer counter bushing can be centered in the contact device via the preferably curved and radially inward-projecting lamellae. When the outer counter bushing is inserted into the outer contact bushing, the lamellae can be elastically bent back against the pre-bend, thus generating the restoring force as the contact force.

[0033] A spring element acting in the axial direction can be arranged between the first busbar and the second busbar. The spring element can enclose the inner contact socket. A spring element can be, for example, a wave spring washer. The spring element can also be a spring assembly made of disc springs. The spring element can compensate for manufacturing tolerances. The spring element can compensate for thermal expansion. Likewise, the spring element can compensate for settlement movements of the contact system. The spring element can ensure good electrical contact between the contact devices.

[0034] The outer contact socket pair can have an oversize compared to a reference dimension of the inner contact socket pair. The spring element can be compressed by the oversize when installed. During contacting, the outer contact socket pair can lead the inner contact socket pair by the oversize. This allows the outer contact socket pair to be electrically connected before the inner contact socket pair.

[0035] A spring element acting in the axial direction can be arranged between the rear side of at least one of the contact devices and the tension rod. The spring element can be compressed by the tensile force. The spring element can be a wave spring washer, for example. The spring element can also be a spring assembly made of disc springs. The spring element can compensate for thermal expansion. Likewise, the spring element can compensate for settlement movements of the contact system. The spring element can ensure good electrical contact between the contact devices. Short character description

[0036] Advantageous embodiments of the invention are explained below with reference to the accompanying figures. They show: Fig. 1 a sectional view of a contact system according to an embodiment; and Fig. 2 a sectional view of a contact system according to another embodiment.

[0037] The figures are merely schematic representations and serve only to illustrate the invention. Identical or equivalent elements are provided with the same reference numerals throughout. Detailed description

[0038] Fig. 1shows a sectional view of a contact system 100 according to an exemplary embodiment. The contact system 100 electrically connects two double busbars 102. The contact system 100 has a contact device 104 and a counterpart 130 that is essentially the same as the contact device 104. The double busbars 102 each consist of two parallel busbars 106, 108. The busbars 106, 108 each have electrical insulation 110. The contact device 104 and the counterpart 130 are arranged at end regions of the double busbars 102. The contact device 104 and the counterpart 130 are aligned transversely to a main extension direction of the double busbars 102 and are each arranged on a flat side of the respective double busbar 102.

[0039] The contact device 104 has two coaxially arranged contact sockets 112, 114. The contact sockets 112, 114 are essentially hollow cylindrical. An outer contact socket 112 encloses an inner contact socket 114. An insulation 110 is also arranged between the contact sockets 112, 114. The outer contact socket 112 is electrically conductively connected to the first busbar 106 of the first double busbar 102. The inner contact socket 114 is electrically conductively connected to the second busbar 108 of the first double busbar 102. The inner contact socket 114 extends through the first busbar 106 to reach the second busbar 108 arranged behind it.

[0040] The counterpart 130 has two coaxially arranged mating bushings 132, 134. The mating bushings 132, 134 are essentially hollow cylindrical. An outer mating bushing 132 encloses an inner mating bushing 134. An insulation 110 is also arranged between the mating bushings 132, 134. The outer mating bushing 132 is electrically conductively connected to the first busbar 106 of the second double busbar 102. The inner mating bushing 134 is electrically conductively connected to the second busbar 108 of the second double busbar 102. The inner mating bushing 134 extends through the first busbar 106 to reach the second busbar 108 arranged behind it.

[0041] The outer contact socket 112 and the outer mating socket 132 are electrically connected to each other and form an outer contact socket pair. The inner contact socket 114 and the inner mating socket 134 are also electrically connected to each other and form an inner contact socket pair.

[0042] The inner contact bushing 114 and the inner mating bushing 134 enclose a receptacle 116 for a tie rod 118. The tie rod 118 is a screw extending through the contact device 104 and the mating piece 130, onto which a nut is screwed. The tie rod 118 rests against the rear sides of the contact device 104 and the mating piece 130, or the second bus bars 108. The tie rod 118 pulls the contact device 104 and the mating piece 130 together with a tensile force until the end contact surfaces 120 of the contact bushings 112, 114 and the mating bushings 132, 134 are pressed against each other.

[0043] In one embodiment, the busbars 106, 108 are made of an aluminum material, while the contact sockets 112, 114 and the mating sockets 132, 134 are made of a copper material. The contact sockets 112, 114 and the mating sockets 132, 134 are connected to the busbars 106, 108 by friction welding to ensure a secure electrically conductive connection.

[0044] In one embodiment, the tie rod 118 is electrically connected to the inner contact socket 114, the inner counter socket 134, and the second busbars 108. During operation, current thus also flows through the tie rod 118.

[0045] In one embodiment, the outer contact socket 112 of the contact device 104 is longer than the inner contact socket 114 of the contact device 104, while the outer counter socket 132 of the counterpart 130 is shorter than the inner counter socket 134 of the counterpart 130. The contact system 100 centers itself through a resulting shoulder between the contact sockets 112, 114.

[0046] In one embodiment, the contact surfaces 120 of the contact sockets 112, 114 and the mating sockets 132, 134 are conical. The contact surfaces 120 of the contact device 104 are annular conical sections, while the contact surfaces 120 of the mating part 130 are annular funnel sections, or vice versa. The funnel shape allows for a slight lateral offset during assembly to be compensated for, as the conical contact surfaces 120 slide against each other.

[0047] Alternatively, the contact surfaces 120 can also be spherical. In this case, the contact surfaces 120 are concave or convex, annular spherical segments. The contact surfaces 120 of the inner contact socket 114 and the outer contact socket 112 can be spherical segments of the same sphere, i.e., they can have a common radius center. This prevents the contact devices 104 from tilting against each other, and the contact system 100 can have an angular tolerance.

[0048] In one embodiment, a spring element 122 is arranged in the counterpart 130 between the inner counter-socket 134 and the outer counter-socket 132, or between the busbars 106, 108 of the second double busbar 102. The counter-sockets 132, 134 are axially movable relative to one another. When the spring element 122 is in a relaxed state, the outer counter-socket 132 slightly leads the inner counter-socket 134. Thus, when the contact system 100 is assembled, the contact surfaces 120 of the outer contact-socket pair touch before the contact surfaces 120 of the inner contact-socket pair. In order for the inner contact socket pair to touch, the tension rod 118 pulls the contact system 100 against the spring element 122 and compresses the spring element 122. A spring rate of the spring element 122 and a spring travel of the spring element 122 define a contact force acting on the outer contact surfaces 120.The spring travel corresponds to a distance by which the outer counter bushing 132 precedes the inner counter bushing 134. The spring element 122 compensates for manufacturing tolerances of the contact device 104 and the counterpart 130.

[0049] In one embodiment, a spring element 122 is arranged between a screw head of the tie rod 118 and a rear side of the contact device 104. When the tie rod 118 is tightened, the spring element 122 is compressed with the full tensile force of the tie rod 118. The spring element 122 can compensate for different thermal expansions of the tie rod 118 and the inner contact socket pair.

[0050] In one embodiment, the entire contact system 100, including the end regions of the double busbars 102, is arranged in an electrically insulating housing 124. The housing is made of a plastic material and has an access opening to the tie rod 118. The access opening is closed by an electrically insulating cover.

[0051] Fig. 2 shows a sectional view of a contact system 100 according to an embodiment. The contact system 100 essentially corresponds to the contact system in Fig. 1 In contrast, the tie rod 118 here only acts on the inner contact pair. The inner contact pair is as in Fig. 1 Electrically contacted at the front end at the contact surfaces 120. The tensile force of the tie rod 118 acts on the inner contact surfaces 120.

[0052] The outer contact bushing 112 has a laminar strip 200 on its inner side, which contacts an outer side of the outer mating bushing 132. The outer mating bushing 132 is thus partially arranged within the outer contact bushing 112. The laminar strip 200 is elastically deformed when the outer mating piece 132 is inserted into the outer contact bushing 112 and thus presses against the outer side of the outer mating bushing 132 with a contact force.

[0053] The elastic lamella band 200 allows the outer contact bushing 112 and the outer counter bushing 132 to move relative to each other to compensate for thermal expansion, angular movements of the double busbars 102, and tolerances of the contact system 100. In particular, the outer contact bushing 112 and the outer counter bushing 132 can move axially relative to each other without interrupting the electrical contact.

[0054] In one embodiment, the lamella strip 200 consists of a ladder-shaped strip of sheet metal. Due to a plurality of parallel slots cut or punched into the strip, the lamella strip 200 has an upper belt, a lower belt, and the lamellae formed between the slots. The lamellae are curved around a longitudinal axis of the strip. For insertion into the outer contact socket 112, the strip is cut to length and wound spirally. Within the contact socket 112, the winding is released, and the strip adheres to the inside of the outer contact socket 112 in a ring-like manner due to a restoring force of the upper and lower belts.

[0055] In one embodiment, the laminar strip 200 is arranged in a groove 202 that runs annularly around the inner side of the outer contact socket 112. The groove 200 axially fixes the laminar strip 200 and prevents it from being axially displaced when the outer counter socket 132 is inserted into the outer contact socket 112.

[0056] In one embodiment, the outer mating bushing 132 is arranged in an annular gap between the outer contact bushing 112 and the insulation 110. The outer contact bushing 112 has an enlarged diameter to provide space for the gap. The gap nests the contact device 104 and the mating part 130, resulting in a reduced overall height.

[0057] In other words, a centrally screwed double socket is presented as a contact system for a double rail power transmission system.

[0058] In addition to traditional round conductor and single-rail systems, double-rail systems can also be used to transmit electrical energy in e-mobility, as they offer the advantage of reducing electromagnetic field radiation through field cancellation. Field cancellation results from a geometric arrangement of congruent rectangular rails positioned one above the other and as close to each other as possible. Interfaces with a contact system are required to connect these double-rail systems to components such as charging sockets, switch boxes, or batteries.

[0059] The present approach presents a contact system that geometrically consists of two concentrically nested, yet electrically insulated, socket contacts. Characteristic features are the contact surfaces on the face of the sockets, which can be designed as orthogonal surfaces to the socket's central axis, as conical surfaces, or as spherical surfaces. The required contact force is applied via a continuous central screw preloaded against material relaxation. Tolerance compensation between the contact pairs on the plus and minus sides of the contact is ensured by further preloading of the inner socket elements, e.g., using a wave spring. The contact system is thus defined in all three axes, resulting in no degrees of freedom for microvibrations.

[0060] The contact system can be screwed or locked into the housing. Possible applications include the interface to the charging socket (optionally screwed directly into one of the DC pins), the interface to the switch box or battery, and use as a floating disconnect point for a segmented double rail in difficult installation spaces where the entire length is unmanageable or cannot be installed in one piece.

[0061] Due to the increasing electrical performance requirements in the context of e-mobility, the aspect of occupant protection against electromagnetic radiation (ICNIRP) is becoming increasingly important. High-voltage (HV) double-rail systems can transport high amounts of energy while simultaneously emitting low electromagnetic fields. The rail system requires suitable interfaces suitable for outdoor use. The contact system presented here allows the double rail to be used in the installation space as an interface to the switch box or battery. The contact system can also be used as an interface to the charging socket (optionally screwed directly into one of the DC pins), as an interface to the switch box or battery, and as a floating disconnect point for a segmented double rail in difficult installation spaces where its entire length is unmanageable.

[0062] The figure shows a cross-sectional view of the contact system with flanged busbars. The housings are shown only conceptually. The cross-sectional view shows the spring element (shown here as a wave spring), which preloads the outer contact socket of the header upward and ensures tolerance compensation.

[0063] The outer, larger pair of bushings is designed in such a way that, in every tolerance case, there is a shorter length than the reference length of the inner pair of bushings. This shorter length is corrected by a spring preload.

[0064] The contact force of the outer pair of bushings is determined solely by the spring preload. This completely eliminates the possibility of the inner pair of bushings making contact before the outer pair.

[0065] The double bushing for the double rail energy transmission system can also be designed with lamella and centrally screwed.

[0066] This embodiment also consists geometrically of two concentrically nested, but electrically insulated sockets, whereby the electrical connection of the inner contact pair is realized at the end by a tie rod, while the outer contact pair is designed as interlocking sockets. A characteristic of the socket contact system is the laminar strip incorporated as a contact surface on the inner surfaces of the outer socket. This can be pre-punched as an endless strip, cut to length and inserted into an annular groove provided for this purpose in the socket. The contact surfaces on the end face of the inner contact pair can be designed as a surface orthogonal to the socket center axis, as conical surfaces or as spherical surfaces. The necessary contact force is applied via a continuous tie rod that is pre-tensioned against material relaxation (e.g. by a central screw).

[0067] In Fig. 2A sectional view of the exemplary embodiment with the front-face contacting screw contact system of the inner socket and the lamella contact system of the outer socket is shown. The sectional view also shows the contact system with flanged busbars. The housings shown are merely indicated.

[0068] The tie rod is designed as a through-bolt that is screwed from the plug shown above into the header shown below. A spring element is located between the screw head and the inner contact socket of the plug, which preloads the inner contact socket of the header upward. To ensure tolerance compensation, the outer lower socket with the inserted lamella contacts the inserted outer upper socket.

[0069] Since the devices and methods described in detail above are exemplary embodiments, they can be modified to a wide extent by those skilled in the art in the usual way.

[0070] In particular, the mechanical arrangements and the size ratios of the individual elements to each other are only examples LIST OF REFERENCE SYMBOLS

[0071] 100Contact system 102Double busbar 104Contact device 106First busbar 108Second busbar 110Insulation 112Outer contact socket 114Inner contact socket 116Receptacle 118Tie rod 120Contact surface 122Spring element 124Housing 130Counterpart 132Outer counter socket 134Inner counter socket 200Slat band 202Groove

Claims

1. Double busbar (102) having a contact device (104), wherein the double busbar (102) has a first busbar (106) and a second busbar (108), which are separated from each other by an insulation (110) and are stacked one above the other to form a stack, wherein the contact device (104) has an outer contact socket (112) for contacting an outer mating socket (132) of a mating piece (130) to the contact device (104) and an inner contact socket (114) arranged coaxially in the outer contact socket (112) for contacting an inner mating socket (134) of the mating piece (130), wherein the inner contact socket (114) encloses an axial receptacle (116) for a tie rod (118) for exerting an axial tensile force between the contact device (104) and the mating piece (130), wherein the outer contact socket (112) is arranged on a flat side of the first busbar (106) and is electrically conductively connected to the first busbar (106), wherein the inner contact socket (114) is electrically conductively connected to the second busbar (108) and passes through the first busbar (106), wherein the receptacle (116) passes through the first busbar (106) and the second busbar (108), wherein an end-side contact face (120) of the outer contact socket (112) projects beyond an end-side contact face (120) of the inner contact socket (114).

2. Double busbar (102) having a contact device (104) according to Claim 1, in which an end-side contact face (120) of the outer contact socket (112) is conical and / or an end-side contact face (120) of the inner contact socket (114) is conical.

3. Double busbar (102) having a contact device (104) according to Claim 1, in which an end-side contact face (120) of the outer contact socket (112) is spherical and / or an end-side contact face (120) of the inner contact socket (114) is spherical.

4. Double busbar (102) having a contact device (104) according to any of the preceding claims, in which a lamellar strip (200) for contacting the outer mating socket (134) is arranged on an inner side of the outer contact socket (112).

5. Double busbar (102) having a contact device (104) according to any of Claims 1 to 3, in which a spring element (122) acting in the axial direction is arranged between the first busbar (106) and the second busbar (108), wherein the spring element (122) surrounds the inner contact socket (114).

6. Contact system (100) having two double busbars (102), wherein the double busbars (102) each have a first busbar (106) and a second busbar (108), which are separated from each other by an insulation (110) and are stacked one above the other to form a stack, wherein the one double busbar (102) is a busbar according to any of Claims 1-5, and wherein the other double busbar (102) has a mating piece (130) to the contact device (104), wherein the outer contact socket (112) is electrically conductively connected to an outer mating socket (132) of the mating piece (130) and forms an outer contact socket pair of the contact system (100), wherein the inner contact socket (114) is electrically conductively connected to an inner mating socket (134) of the mating piece (130) at an end-side contact face (120) and forms an inner contact socket pair of the contact system (100), wherein a tie rod (118) for exerting an axial tensile force is arranged in the receptacle (116) and pulls the contact device (104) and the mating piece (130) together with the tensile force.

7. Contact system (100) according to Claim 6, in which the contact device (104) has a spring element (122) according to Claim 5, wherein the outer contact socket pair has an overdimension in relation to a reference dimension of the inner contact socket pair, wherein the spring element (122) is compressed by the overdimension.

8. Contact system (100) according to either of Claims 6 and 7, in which a spring element (122) acting in the axial direction is arranged between a rear side of the contact device (104) and the tie rod (118), wherein the spring element (122) is compressed by the tensile force.