Contact device for double busbar and two contact systems for double busbar

Abstract

The invention relates to a contact device (104) for a double busbar (102), wherein the double busbar (102) has a first busbar (106) and a second busbar (108) which are separated from one another by an insulation (110) and are stacked in a stack, wherein the contact device (104) has an outer socket (112) for contacting an outer mating socket (132) of a counterpart (130) to the contact device (104) and an inner socket (114) which is coaxially arranged in the outer socket (112) for contacting an inner mating socket (134) of the counterpart (130), wherein the inner socket (114) surrounds an axial bearing groove (116) for a tension rod (118) for applying an axial tension between the contact device (104) and the counterpart (130), wherein the outer socket (112) is arranged at a flat side of the first busbar (106) and is electrically conductively connected to the first busbar (106), wherein the inner socket (114) is electrically conductively connected to the second busbar (108) and passes through the first busbar (106), wherein the bearing groove (116) passes through the first busbar (106) and the second busbar (108).

Description

Technical Field

[0001] This invention relates to a contact device for double busbars and a contact system for two double busbars. Background Technology

[0002] The invention will be described below primarily in the context of vehicle power supplies. However, the invention can be used in any application that transmits electrical loads, particularly large electrical loads with, for example, high power greater than 10kW or high voltage greater than 100V.

[0003] In a vehicle's low-voltage power supply, the conductive metal plates on the vehicle body can be used as grounding, thereby shortening the length of the return cable. Therefore, almost half of all the cabling within the vehicle can be discarded.

[0004] For example, high voltage in motor vehicles, exceeding 300V or even 700V, can be used to transmit large electrical loads. Busbars made of solid metal materials can be used for high voltage in motor vehicles. If busbars are used, separate positive and negative busbars may be required to ensure necessary safety (protection against touch, arcing, or voltage breakdown, etc.). Positive and negative busbars can be designed as dual busbars, i.e., formed by flat stacking with a small pitch (<5mm). Summary of the Invention

[0005] Therefore, the objective of this invention is to provide an improved contact device for double busbars and an improved contact system for two double busbars using the simplest possible design. Here, improvements may, for example, involve improved radiation characteristics, particularly reduced electromagnetic field radiation.

[0006] This task is accomplished through the subject matter of the independent claims. Advantageous improvements of the invention are described in detail in the dependent claims, the specification, and the drawings.

[0007] In electric vehicles, even under the high voltage conditions of motor vehicles, a large current is required to transmit drive power, braking power, or regenerative power. The current generates an electromagnetic field around the current-carrying conductors of the vehicle. The conductors can be shielded to reduce or even prevent field radiation. Alternatively or additionally, the feeder and return conductors can be arranged as parallel and close to each other as possible, because the electromagnetic fields caused by opposing currents cancel each other out.

[0008] Even in the case of busbars, the feeder busbar and the return busbar can be arranged very close together by stacking the two busbars equally. The stacked busbars are electrically isolated individually. This arrangement can be called a double busbar.

[0009] In order to maintain the elimination effect at the contact position, the proposed approach here is to use a center-tightened double socket that allows coaxial current guidance at the contact position as well.

[0010] A contact device for a dual busbar is proposed, wherein the dual busbars have a first busbar and a second busbar that are separated from each other by insulation and stacked into a single stack. The contact device has an external socket for contacting a mating member of the contact device and an internal socket coaxially disposed in the external socket for contacting the mating member. The internal socket surrounds an axial groove for a pull rod that applies axial tension between the contact device and the mating member. The external socket is disposed on the flat side of the first busbar and is electrically connected to the first busbar. The internal socket is electrically connected to the second busbar and passes through the first busbar. The groove passes through both the first and second busbars.

[0011] A contact system for two double busbars is also proposed, wherein the double busbars each have a first busbar and a second busbar that are separated from each other by insulation and stacked into a single stack. One double busbar has a contact device according to the proposed method, and the other double busbar has a mating member of the contact device. The external socket is electrically connected to the external mating socket of the mating member to form an external socket pair of the contact system. The internal socket is electrically connected to the internal mating socket of the mating member at one end contact surface to form an internal socket pair of the contact system. A pull rod for applying axial tensile force is disposed in the groove and the contact device and the mating member are pulled together by means of the tensile force.

[0012] A busbar can refer to a solid, elongated metal strip. For example, a busbar can be made of aluminum or copper. Aluminum or aluminum alloys have good electrical conductivity, are lightweight, and are inexpensive. Copper or copper alloys can have higher electrical conductivity than aluminum or aluminum alloys. Furthermore, copper or copper alloys may be oxidation-resistant and have low contact resistance. The busbar can have a rectangular conductor cross-section. Here, the busbar can be elongated and have a length, for example, greater than 0.5 m, preferably greater than 1 m, and a width, for example, between 0.5 cm and 10 cm, preferably between 1 cm and 5 cm. The busbar can also have a thickness, for example, between 1 mm and 10 mm. The busbar can be insulated on all sides, i.e., wrapped with an insulating layer. For example, the insulation can be made of a plastic material. The plastic material can be thermoplastic. The busbar can be encapsulated in thermoplastic injection molding. This insulation can have characteristics designed for high voltage applications in motor vehicles up to 1000 volts DC. In particular, the thickness of the insulation material ensures insulation strength against high voltage applications in motor vehicles.

[0013] A double busbar can consist of two busbars of the same size. These two busbars can be stacked on top of each other on their flat sides. The busbars can also be very close together. The busbars can be arranged equally. The double busbar can be covered with a plastic material. Alternatively or additionally, the double busbar can be covered with a fabric material. For example, the fabric material can be wrapped around the double busbar as a fabric strip. The double busbar can also be shielded from electromagnetic radiation by a conductive sleeve.

[0014] In the installed state, one busbar of the dual busbar system can be connected to the positive potential of the vehicle's high voltage. The other busbar can be connected to the negative potential of the vehicle's high voltage. The currents flowing through the two buses therefore flow in opposite directions and are of equal magnitude. The spatial adjacency of the buses in the dual busbar system causes the resulting electromagnetic fields to essentially cancel each other out.

[0015] The socket can be made of copper. The socket can be rotationally symmetrical. The socket can be substantially hollow cylindrical. The socket can have a connection geometry for conductive connection with its respective busbar.

[0016] The sockets are electrically isolated from each other. An insulating bushing may be provided between the inner and outer sockets. This insulating bushing may be rotationally symmetrical. The insulating bushing may be substantially hollow cylindrical.

[0017] The mating socket can be made of copper. The mating socket can be rotationally symmetrical. The mating socket can be substantially hollow cylindrical. The mating socket can have a connection geometry for conductive connection with its respective busbar.

[0018] The mating sockets are electrically isolated from each other. An insulating bushing may be disposed between the inner mating socket and the outer mating socket. The insulating bushing may be rotationally symmetrical. The insulating bushing may be substantially hollow cylindrical.

[0019] The groove can be a continuous recess in the inner socket and inner mating socket. The pull rod can consist of screws and nuts. A washer can be provided between the back of the contact device or mating part and the pull rod base.

[0020] The contact device and mating part can be designed to be mirror images of each other or complementary in shape. The end contact surfaces of the inner socket can be flat.

[0021] The end contact surface of the external socket may protrude beyond the end contact surface of the internal socket. A contact device with a protruding external socket can be referred to as a plug of a contact system.

[0022] Alternatively, the end contact surface of the inner socket may protrude beyond the end contact surface of the outer socket. A contact device with a protruding inner socket can be referred to as a connector of a contact system.

[0023] The end contact surface of the external socket can be formed in a conical shape. Alternatively or additionally, the end contact surface of the internal socket can be formed in a conical shape. The conical shape allows the contact devices to be aligned with each other during contact.

[0024] The end-side contact surface of the external socket can be spherically formed. Alternatively or additionally, the end-side contact surface of the internal socket can be spherically formed. This spherical shape allows for angular tolerances in the contact system. Therefore, precise parallel alignment of the two busbars is not required.

[0025] A thin strip for contacting the external mating socket can be disposed on the inner side of the external socket. The thin strip can be annularly wrapped around the inner diameter of the external socket. The thin strip can be conductive and electrically connected to the inner side of the external socket. The thin strip can have a resilient sheet. The thin strip can have an inner diameter smaller than that of the external socket. The sheet can be oriented substantially axially in the external socket. When contacted by the external mating socket, the sheet can elastically deform and press against the external mating socket with the resulting restoring force. Axial misalignment and / or angular misalignment between the contact device and the mating member can be compensated by the elasticity of the sheet.

[0026] The external mating socket can substantially correspond to the external socket. The outer diameter of the external mating socket can be smaller than the inner diameter of the external socket in the strip area. The outer diameter of the external mating socket can be larger than the inner diameter of the strip. The mating socket can be designed without a strip.

[0027] The outer socket may have an annular groove, or circumferential groove, on its inner side for the sheet strip. At least a portion or all of the sheet strip allocated to the outer socket may be accommodated in this groove. The sheet strip may be axially secured in the outer socket through a groove. The sheet of the sheet strip may protrude from the groove into the inner cavity of the outer socket. The sheet strip may be inserted into the groove as a strip bent into a circle with a length corresponding to the circumference of the groove. The sheet strip may be pressed against the bottom of the groove by a restoring force.

[0028] An annular gap for an external mating socket between the external and internal sockets can be provided within the area of ​​the outer thin strip. This gap can be wider than the external mating socket. The gap can be defined on its inner side by the insulation. This gap can be formed by increasing the inner diameter of the external socket. The external mating socket can be inserted between the external and internal sockets through this gap. Therefore, this contact system can have a low structural height.

[0029] The thin strip can be elongated, extending substantially parallel to the axial direction of the outer socket, and at least partially protruding radially inward beyond the inner surface of the outer socket. The thin strip can elastically protrude radially inward beyond the inner surface of the outer socket.

[0030] The sheet strip may include an upper flange, a lower flange, and multiple sheets arranged laterally between the upper and lower flanges. The sheet strip may be a stamped and bent piece. The sheet strip may have gaps between the sheets. The sheet strip can be easily bent through these gaps. The flanges can connect individual sheets at both ends in a stepped configuration. The sheets may be pre-bent in an arc shape.

[0031] The outer mating socket can be centered within the contact device via a radially inwardly projecting, preferably arc-shaped, thin sheet. When the outer mating socket is inserted into the outer socket, the thin sheet can elastically bend back by overcoming the pre-bending action, thus generating a restoring force as a contact force.

[0032] An axially acting spring can be installed between the first and second busbars. The spring can surround the inner contact. For example, the spring can be a corrugated spring washer. Similarly, the spring can be an assembly of disc springs. The spring can compensate for manufacturing tolerances. The spring can compensate for thermal expansion. The spring can also compensate for the sinking movement of the contact system. This spring ensures good electrical contact between the contact devices.

[0033] Compared to the reference dimensions of the inner socket pair, the outer socket pair can have an interference fit. In the installed state, the spring can be compressed with this interference fit. Upon activation, the outer socket pair can lead the inner socket pair with this interference fit. Thus, the outer socket pair can be electrically connected to each other before the inner socket pair.

[0034] An axially acting spring can be provided between the back of at least one of the contact devices and the pull rod. The spring can be compressed by tensile force. For example, the spring can be a wave spring washer. Similarly, the spring can be a spring plate assembly composed of disc springs. The spring can compensate for thermal expansion. The spring can also compensate for the sinking movement of the contact system. Good electrical contact between the contact devices can be ensured by the spring. Attached Figure Description

[0035] Advantageous embodiments of the invention are explained below with reference to the accompanying drawings, in which:

[0036] Figure 1 A cross-sectional view of a contact system according to one embodiment is shown;

[0037] Figure 2 A cross-sectional view of a contact system according to another embodiment is shown.

[0038] The figures are merely illustrative and are used only to explain the invention. Identical or functionally equivalent parts are always marked with the same reference numerals. Detailed Implementation

[0039] Figure 1 A cross-sectional view of a contact system 100 according to one embodiment is shown. The contact system 100 electrically connects two double busbars 102. The contact system 100 has a contact device 104 and a mating member 130 substantially mirror-symmetrical to the contact device 104. Each double busbar 102 consists of two parallel busbars 106 and 108. Busbars 106 and 108 each have electrical insulation 110. The contact device 104 and the mating member 130 are arranged at the ends of the double busbars 102. Here, the contact device 104 and the mating member 130 are oriented transversely to the main extension direction of the double busbars 102 and are respectively arranged on the flat side of their respective double busbars 102.

[0040] The contact device 104 has two coaxially arranged sockets 112 and 114. Sockets 112 and 114 are generally hollow cylindrical. The outer socket 112 surrounds the inner socket 114. Insulation 110 is also arranged between sockets 112 and 114. The outer socket 112 is electrically connected to the first busbar 106 of the first double busbar 102. The inner socket 114 is electrically connected to the second busbar 108 of the first double busbar 102. The inner socket 114 passes through the first busbar 106 to reach the second busbar 108 located behind it.

[0041] The mating component 130 has two coaxially arranged mating sockets 132 and 134. The mating sockets 132 and 134 are generally hollow cylindrical. The outer mating socket 132 surrounds the inner mating socket 134. An insulator 110 is also provided between the mating sockets 132 and 134. The outer mating socket 132 is electrically connected to the first busbar 106 of the second double busbar 102. The inner mating socket 134 is electrically connected to the second busbar 108 of the second double busbar 102. The inner mating socket 134 passes through the first busbar 106 to reach the second busbar 108 located behind it.

[0042] External socket 112 and external mating socket 132 are electrically connected to each other to form an external socket pair. Internal socket 114 and internal mating socket 134 are also electrically connected to each other to form an internal socket pair.

[0043] The inner socket 114 and the inner mating socket 134 surround the support 116 for the pull rod 118. The pull rod 118 is a screw with a nut screwed through the contact device 104 and the mating member 130. The pull rod 118 abuts against the back of the contact device 104 and the mating member 130 or the second busbar 108. The pull rod 118 pulls the contact device 104 and the mating member 130 together until the end contact surfaces 120 of the sockets 112, 114 and the mating sockets 132, 134 press against each other.

[0044] In one embodiment, busbars 106 and 108 are made of aluminum, while sockets 112 and 114 and mating sockets 132 and 134 are made of copper. Sockets 112 and 114 and mating sockets 132 and 134 are connected to busbars 106 and 108 by friction welding to obtain a reliable conductive connection.

[0045] In one embodiment, the pull rod 118 is electrically connected to the inner socket 114, the inner mating socket 134, and the second busbar 108. Therefore, current also flows through the pull rod 118 during operation.

[0046] In one embodiment, the external socket 112 of the contact device 104 is longer than the internal socket 114 of the contact device 104, and the external mating socket 132 of the mating member 130 is shorter than the internal mating socket 134 of the mating member 130. The contact system 100 automatically centers via a shoulder formed between the sockets 112 and 114.

[0047] In one embodiment, the contact surfaces 120 of the sockets 112, 114 and the mating sockets 132, 134 are conical. Here, the contact surface 120 of the contact device 104 is an annular conical portion, while the contact surface 120 of the mating member 130 is an annular funnel portion, or vice versa. This funnel shape can compensate for slight lateral misalignment during installation, as the conical contact surfaces 120 slide against each other.

[0048] Alternatively, the contact surface 120 can also be designed as a sphere. Thus, the contact surface 120 is a concave or convex annular spherical portion. The contact surfaces 120 of the inner socket 114 and the outer socket 112 can be segments of the same sphere, i.e., they can have a common radius center. Therefore, the contact devices 104 cannot be tilted relative to each other, and the contact system 100 can have angular tolerances.

[0049] In one embodiment, in the mating member 130, a spring member 122 is arranged between the inner mating socket 134 and the outer mating socket 132, or between the buses 106 and 108 of the second double busbar 102. The mating sockets 132 and 134 are axially movable relative to each other. In the relaxed state of the spring member 122, the outer mating socket 132 slightly leads the inner mating socket 134. Therefore, when the contact system 100 is assembled, the contact surfaces 120 of the outer socket pair contact before the contact surfaces 120 of the inner socket pair. For the inner socket pair to contact, the pull rod 118 pulls the contact system 100 against the spring member 122 and compresses the spring member 122. The spring stiffness and spring deformation of the spring member 122 define the contact force acting on the outer contact surface 120. The spring deformation corresponds to the distance by which the outer mating socket 132 extends beyond the inner mating socket 134. Manufacturing tolerances of the contact device 104 and the mating member 130 are compensated by the spring member 122.

[0050] In one embodiment, a spring 122 is disposed between the screw head of the pull rod 118 and the back of the contact device 104. When the pull rod 118 is pulled, the spring 122 is compressed with the full tension of the pull rod 118. The spring 122 can compensate for the different thermal expansions of the pull rod 118 and the insert pair.

[0051] In one embodiment, the entire contact system 100, including the ends of the double busbars 102, is arranged within an electrically insulating housing 124. The housing is made of plastic and has an access port for the pull rod 118. The access port is closed by an electrically insulating cover.

[0052] Figure 2 A cross-sectional view of a contact system 100 according to one embodiment is shown. The contact system 100 substantially corresponds to... Figure 1 The contact system in this case. Unlike the previous system, the pull rod 118 here only acts on the insertion pair. For example... Figure 1 As shown, the inner socket is electrically connected at the contact surface 120 on the end side. The pulling force of the pull rod 118 acts on the inner contact surface 120.

[0053] The external socket 112 has a thin strip 200 on its inner side that contacts the outer side of the external mating socket 132. The external mating socket 132 is therefore partially housed in the external socket 112. When the external mating member 132 is inserted into the external socket 112, the thin strip 200 elastically deforms and thus presses against the outer side of the external mating socket 132 with a clamping force.

[0054] The flexible strip 200 allows the external socket 112 and the external mating socket 132 to move relative to each other to compensate for the thermal expansion and angular movement of the dual busbar 102 and the tolerances of the contact system 100. In particular, the external socket 112 and the external mating socket 132 can move axially relative to each other without breaking the electrical contact.

[0055] In one embodiment, the sheet strip 200 is made of a trapezoidal strip of metal. Due to the formation of numerous parallel slits in the strip by cutting or stamping, the sheet strip 200 has an upper flange, a lower flange, and numerous thin sheets formed between the slits. The sheets are curved around the longitudinal axis of the strip. For insertion into the outer socket 112, the strip is cut to a certain length and spirally wound. Inside the socket 112, the winding is unwound, and the strip, through the restoring force of the upper and lower flanges, abuts against the inner surface of the outer socket 112 in a ring shape.

[0056] In one embodiment, the sheet strip 200 is disposed in a groove 202 that is annularly surrounding the outer socket 112 on the inside. The sheet strip 200 is axially fixed by the groove 202 and cannot move axially when the outer mating socket 132 is inserted into the outer socket 112.

[0057] In one embodiment, the external mating socket 132 is disposed in the annular gap between the external socket 112 and the insulation 110. The external socket 112 has an enlarged diameter to provide space for the gap. The contact device 104 and the mating member 130 are nested through this gap and have a reduced structural height.

[0058] In other words, a center-tightened double-socket design is proposed, in the form of a contact system for a dual-busbar power transmission system.

[0059] Besides the classic circular conductor and single busbar systems used in electric vehicles, dual busbar systems can also be used for power transmission because they offer the advantage of less electromagnetic field radiation due to field elimination. Field elimination originates from the geometric arrangement of equally overlapping rectangular buses with minimal spacing between them. Interfaces with contact systems are required to connect these dual busbar systems to components such as charging sockets, switch boxes, or batteries.

[0060] This approach proposes a contact system geometrically composed of two concentrically nested but electrically insulated socket contacts. A key feature is the contact surface on the socket end face, which can be designed as a surface orthogonal to the socket's central axis, a conical surface, or a spherical surface. The required contact force is applied via a continuous, pre-tightened central screw to prevent material relaxation, wherein tolerance compensation between the contact pairs on the positive and negative sides of the contacts is ensured by means of, for example, a wave spring. This contact system is therefore statically determinate in all three axes, with no degrees of freedom for micro-vibrations.

[0061] The contact system can be screwed on or even locked from the housing side. Applications include charging socket interfaces (optionally screwed directly into one of the DC pins), switch box or battery interfaces, and suspension points for segmented busbars in challenging structural spaces where it appears impossible to use them along their entire length or install them in a single piece.

[0062] As the power requirements of electric vehicles continue to increase, the protection of occupants from electromagnetic inrush (ICNIRP) is receiving growing attention. High-voltage (HV) dual-bus systems can transmit large amounts of energy with low electromagnetic field radiation. This bus system requires suitable outdoor-compatible interfaces. Through the proposed contact system, the dual bus can be installed in space as an interface for a switch box or battery. This contact system can also serve as an interface for a charging socket (optionally screwed directly into one of the DC pins), an interface for a switch box or battery, and a suspension separation point for a segmented dual bus installed in challenging structural spaces (where its entire length appears impassable).

[0063] The drawing shows a cross-sectional view of a contact system with a flanged busbar connection. The housing is shown conceptually only. A spring element (shown as a wave spring in this example) can be seen in the cross-section, which preloads the outer socket of the connector and ensures tolerance compensation.

[0064] The larger external socket pair is structurally designed such that, under any tolerance, there is a length deficiency regarding the reference length of the internal socket pair. This dimensional deficiency is eliminated by spring preload.

[0065] The contact force of the external connector pair is determined solely by the spring preload. Therefore, it is impossible for the internal connector pair to be engaged before the external connector pair under any circumstances.

[0066] Dual-socket connectors for dual-bus power transmission systems can also be designed with a thin plate and a center screw-in.

[0067] Geometrically, this embodiment also consists of two concentric nested but electrically insulated sockets, wherein the electrical connection of the inner contact pair is achieved at the end via a pull rod, while the outer contact pair is designed as a mating socket. The socket contact system is characterized by a thin strip added as a contact surface on the inner surface of the outer socket. This strip can be pre-stamped, cut to length, and inserted into an annular groove thus provided within the socket. The contact surface on the end faces of the inner contact pair can be designed as a surface, conical surface, or spherical surface orthogonal to the central axis of the socket. The required contact force is applied by a continuous pull rod (such as a center screw) pre-tightened in a manner preventing material relaxation.

[0068] Figure 2 A cross-sectional view shows embodiments of a screw contact system with an internal socket and a sheet contact system with an external socket. Additionally, a contact system with a busbar having a flange connection is shown in the cross-sectional view. The housing shown is for illustrative purposes only.

[0069] The pull rod is designed as a through screw, which is screwed into the connector shown below from the plug shown above. A spring is located between the screw head and the inner socket of the plug, pre-tightening the inner socket of the connector upwards. To ensure tolerance compensation, the lower outer socket contacts the upper outer socket with an inserted tab.

[0070] Since the apparatus and methods described above are embodiments, those skilled in the art can make extensive modifications to them in a common manner without departing from the scope of the invention. In particular, the mechanical arrangement and dimensional relationships of the various components are merely exemplary.

[0071] List of reference numerals

[0072] 100 contact system

[0073] 102 Double busbar

[0074] 104 Contact device

[0075] 106 First busbar

[0076] 108 Second busbar

[0077] 110 insulation

[0078] 112 External connector

[0079] 114 Internal connector

[0080] 116 bearing groove

[0081] 118 pull rod

[0082] 120 contact surface

[0083] 122 Spring component

[0084] 124 Casing

[0085] 130 mating parts

[0086] 132 External Pairing Socket

[0087] 134 Internal Pairing Socket

[0088] 200 thin strips

[0089] 202 slot

Claims

1. A contact device (104) for a double busbar (102). in, The double busbar (102) has a first busbar (106) and a second busbar (108) that are separated from each other by insulation (110) and stacked into a single stack. The contact device (104) has an external socket (112) and an internal socket (114). The external socket is used to contact the external mating socket (132) of the mating part (130) of the contact device (104). The internal socket is coaxially disposed in the external socket (112) for contacting the internal mating socket (134) of the mating part (130). The inner socket (114) surrounds the axial bearing groove (116) of the pull rod (118) for applying axial tension between the contact device (104) and the mating member (130). The external socket (112) is located on the flat side of the first busbar (106) and is electrically connected to the first busbar (106). The inner socket (114) is electrically connected to the second busbar (108) and passes through the first busbar (106). The groove (116) passes through the first busbar (106) and the second busbar (108). The end contact surface (120) of the external socket (112) protrudes beyond the end contact surface (120) of the internal socket (114).

2. The contact device (104) according to claim 1, wherein, The end contact surface (120) of the external socket (112) is conical and / or the end contact surface (120) of the internal socket (114) is conical.

3. The contact device (104) according to claim 1, wherein, The end contact surface (120) of the external socket (112) is spherically formed and / or the end contact surface (120) of the internal socket (114) is spherically formed.

4. The contact device (104) according to any one of claims 1 to 3, wherein, A thin strip (200) for contacting the external mating socket (134) is arranged on the inner side of the external socket (112).

5. The contact device (104) according to any one of claims 1 to 3, wherein, An axially acting spring (122) is disposed between the first busbar (106) and the second busbar (108), wherein the spring (122) surrounds the inner socket (114).

6. A contact system (100) for two double busbars (102). in, The dual busbars (102) each have a first busbar (106) and a second busbar (108) that are separated from each other by insulation (110) and stacked into a single stack. One of the double busbars (102) has a contact device (104) according to any one of claims 1 to 5, and the other double busbar (102) has a mating member (130) for the contact device (104). The external socket (112) is electrically connected to the external mating socket (132) of the mating member (130) to form the external socket pair of the contact system (100). The inner socket (114) is electrically connected to the inner mating socket (134) of the mating member (130) on one end contact surface (120) and forms an inner socket pair of the contact system (100). The tie rod (118) for applying axial tension is placed in the groove (116) and the contact device (104) and the mating part (130) are pulled together by the tension.

7. The contact system (100) according to claim 6, wherein, The contact device (104) has a spring (122) according to claim 5, wherein the outer socket pair has an interference fit relative to the basic dimensions of the inner socket pair, wherein the spring (122) is compressed with the interference fit.

8. The contact system (100) according to claim 6 or 7, wherein, A spring (122) acting axially is provided between the back of the contact device (104) and the pull rod (118), wherein the spring (122) is compressed by tension.

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