Double-bus device with total shield

Abstract

The present disclosure relates to a double bus arrangement (1) for a vehicle, in particular for an electric vehicle, comprising: a first bus unit (2) having an insulating first sheath layer element (2b); and a second busbar unit (3) having an insulated second sheath layer element (3b), the first busbar unit (2) and the second busbar unit (3) being arranged insulated from one another by means of the sheath layer elements (2b, 3b) and following the route of the double busbar arrangement (1); the first bus bar unit (2) and the second bus bar unit (3) are in mechanical contact with the outer surfaces (2c, 3c) thereof over a large area with the inner surface (4b) of the total shielding unit (4) in a cross section transverse to the line, and the tubular shielding element (4a) is made of solid metal. The aim of the invention is to achieve improved, in particular simplified, heavy-load current routing in a vehicle.

Description

Technical Field

[0001] The present disclosure relates to a dual busbar device for a vehicle, particularly an electric vehicle, having a first busbar unit and a second busbar unit. The first busbar unit has an insulated first sheath layer element, and the second busbar unit has an insulated second sheath layer element. The first busbar unit and the second busbar unit are insulated from each other by means of the sheath layer elements and jointly follow the route of the dual busbar device. Background Art

[0002] In the field of vehicles, particularly vehicles with an electric drive motor (hereinafter referred to as electric vehicles), busbars, i.e., rigid power cables, are becoming increasingly popular due to the increasing voltage and current. Generally, they are power wire materials with a circular or substantially rectangular cross-section, which can be obtained by means of an instrument including an insulating sheath layer of various diameters and a material such as aluminum or copper in the (solid) conductor core of the busbar. The busbars are connected to other current-carrying components in the respective contact areas peeled off from the insulating sheath layer, for example, at the flat pressed ends of the respective busbars with fixed holes.

[0003] To protect sensitive electronic components, the power cable can be equipped with a shielding unit. The shielding unit usually has a flexible braided shielding element, which is then pulled over the power cable. Particularly in the case where the busbar has a circular cross-section, during the production of the corresponding insulated busbar, a shielding tubular element made of solid metal (e.g., aluminum or copper) is usually applied directly around the insulating layer. Thus, the instrument can provide a corresponding electrically insulated and electromagnetic shielded busbar. Such a bulk material can also be bent to adapt to the given route of the cable in the vehicle.

[0004] It is well known that a large number of power cables are required in vehicles. Due to technical reasons, more and more power cables are designed as busbars, also known as conductor rails. Summary of the Invention

[0005] Therefore, the task is to improve the current routing in vehicles, particularly in electric vehicles, and in particular to achieve a simplified and highly flexible current routing.

[0006] The independent claims solve this task. Advantageous embodiments are apparent from the dependent claims, the description, and the drawings.

[0007] One aspect relates to a dual busbar device for a vehicle, particularly for an electric vehicle. The vehicle can be a land vehicle, such as a motor vehicle, such as a passenger car, a truck, or a motorcycle, or an air vehicle, such as a quadcopter, or a water vehicle, such as a ship. The electric vehicle can be a vehicle with an electric drive motor, such as an electric car.

[0008] The double busbar device has (in particular exactly one) first busbar unit and (in particular exactly one) second busbar unit. The first busbar unit has an electrically insulating first sheath layer element, and the second busbar unit has an electrically insulating second sheath layer element. The sheath layer elements are made in particular of plastics such as PA-12 or XLPE. The first busbar unit and the second busbar unit (which may also be referred to as conductor rail units) are electrically insulated from each other at least by means of the sheath layer elements, and preferably are also arranged adjacent to each other (preferably, a part of their respective outer surfaces abuts against each other), and together follow the route of the double busbar device. This route is generated by the application in the vehicle, usually a curved (non-linear) route, but may also be a piecewise linear or completely linear route. As described below, other units may be arranged between the first busbar unit and the second busbar unit.

[0009] The double busbar device may also have more than two busbar units. For example, it may have a third busbar unit. In operation, the first busbar unit and the second busbar unit may thus correspond to, for example, the positive pole and the negative pole, and the third busbar unit corresponds to the neutral conductor (ground). The third busbar unit may be arranged between the first two busbar units. The double busbar unit may also have additional busbar units through which current can be conducted through the double busbar unit independently of the first two busbar units. In this case, the double busbar unit may also be referred to as a multi-busbar unit. Correspondingly, different busbar units may have different diameters.

[0010] The units arranged between the respective (first and second, but also including the first, second, third and / or additional) busbar units may also include functional units, such as a cooling functional unit. The cooling functional unit may be hollow, and the advantage is that a fluid flow, preferably an air flow, can be guided through the double busbar device for cooling. Corresponding connection elements for connection to a cooling fluid supply may be arranged on such a hollow cooling functional unit. As an alternative to the hollow design, the cooling functional unit may be solid, and the advantage is that it is thinner. In both cases, the improved heat distribution in the double busbar device can prevent local overheating and damage. In order to prevent the sheath layer elements from wrinkling, one or more corresponding sliding functional units may be provided as an alternative or supplementary functional unit.

[0011] The double busbar device may be a high-voltage double busbar device. The high voltage may be, for example, a voltage of at least 60V, preferably at least 200V, particularly preferably at least 380V, very preferably at least 780V. The high voltage may be a DC voltage. In this case, the double busbar device is a DC double busbar device. The double busbar device may also be designed for high current, particularly preferably for a current greater than 10A, preferably for a current greater than 100A.

[0012] The double busbar device has a total shielding unit (which may also be referred to as a total shield), and the total shielding unit has a tubular shielding element made of solid metal, which is designed to electrically shield the busbar unit from the environment. Therefore, the total shielding unit with the tubular shielding element is used to protect electronic components in the environment, especially in a vehicle, from the electromagnetic radiation of the busbar unit. When observed from a cross-section transverse to the route, the first busbar and the second busbar unit are in mechanical contact with the inner surface of the total shielding unit over a large area of their respective outer surfaces, especially over half or more than half of their respective outer surfaces, at least in a section along the route, preferably over most of the tubular shielding element along the route or over the entire tubular shielding element along the route. The corresponding outer surface is specifically the outer surface of the corresponding sheath layer element. For example, other units arranged between the first busbar unit and the second busbar unit may be in mechanical contact with the inner surface of the total shielding unit on the side surface oriented in the width direction defined below. The remaining cavity between the first busbar unit and the second busbar unit and the total shielding unit can also be designed for a cooling flow of a fluid (preferably an air flow), in which the total shielding unit does not abut against one of the busbar units. For example, corresponding connecting elements can be provided for this purpose.

[0013] This has the advantage of enabling a compact, safe and resilient current wiring in a vehicle. On the one hand, the contact of the total shielding unit with most of the corresponding outer surface (cross-section) improves the heat dissipation from the current-carrying busbar unit into the environment of the double busbar device, thus preventing overheating and thereby enabling resilient and at the same time safe current conduction. The tubular shielding element made of solid metal, for example, an extruded profile made of aluminum or another suitable metal, allows the total shielding unit to exert a contact pressure on the sheath layer element, which further improves heat dissipation and counteracts the air pockets that impede heat dissipation between the total shielding unit and the busbar unit and between the two busbar units. At the same time, when the double busbar device is bent (which is necessary to achieve a curved wiring), the contact pressure of the busbar shielding unit on the busbar unit and the contact pressure between the busbar units prevent creases and deformations because the different units slide less relative to each other, thereby preventing damage to the electrical insulation sheath layer elements between the busbar units and between the busbar unit and the busbar shielding unit. This in turn counteracts local overheating and electrical faults. Therefore, the current wiring can be made particularly compact. Ideally, the proportion of the corresponding outer surface of the busbar unit in contact with the total shielding unit is as large as possible, for example, it can exceed 52%, 55% or 60%.

[0014] In one embodiment, the busbar unit is arranged as a flat busbar unit. Specifically, the width of each busbar unit measured in the width direction transverse to the route of the double busbar device is at least twice, preferably at least three times or at least four times, the thickness of each busbar unit measured in the thickness direction transverse to the route and width. This has the advantage of enabling a particularly compact current routing, and the bending behavior of the double busbar device is particularly favorable.

[0015] Preferably, the busbar units are arranged in mechanical contact with each other, with their respective flat sides oriented along the thickness direction. The orientation of a side or surface is determined by its normal vector. Thus, the flat sides of two busbar units arranged adjacent to each other are oriented anti-parallel. This arrangement is optimized in terms of a compact design, i.e., the perimeter of the double busbar device is reduced. In addition, the material required for the total shielding unit is reduced, thereby reducing the weight. In cross-section, the required side lengths of the total shielding unit also become closer (the cross-section of the total shielding device becomes more square-shaped), which improves the bending behavior of the double busbar device and increases the contact pressure on each sheath layer element.

[0016] Particularly preferably, each busbar unit has two circular side surfaces that are radially opposite in a cross-section transverse to the route and connect the opposite flat sides. This enables a particularly elastic and wrinkle-resistant contact between the sheath layer element and the current-carrying conductor core (in use), as well as a particularly high and uniform contact pressure of the total shielding unit on the busbar unit. Specifically, the side surfaces can be rounded circularly, with a radius that is half of the corresponding thickness. This optimizes the distribution of forces that occur particularly when bending the double busbar device, thereby contributing to a compact, safe, and elastic current routing in a vehicle.

[0017] The rounded busbar device is an alternative to the flat busbar device. Here, the total shielding unit can come into better contact with each busbar unit. This is because a smaller proportion of the outer surface of each busbar unit comes into contact with another busbar unit, and thus a larger proportion of each outer surface can come into contact with the total shielding unit. A plurality of busbar units can also follow the route of the double busbar device, with a distance > zero between each other, and ultimately, for example, a diameter of 8 is possible. However, this results in a less favorable bending behavior and greater space consumption.

[0018] In another embodiment, it is provided that the first busbar unit and / or the second busbar unit are bent away from the respective other busbar unit with their respective end sections in one or both end regions of the double busbar device. In one or both end regions of the double busbar device, the busbar units protrude beyond the total shielding unit in a plane, preferably in the width plane. This facilitates the electrical contact at the ends of the double busbar device. Since there are no gaps between the busbar units in the total shielding unit, the large-area contact of the total shielding unit on the busbar units contributes to precise deformation, thus precisely arranging the end sections, which also contributes to a compact, safe and resilient current routing in the vehicle. The contact surface can be arranged on the end section, in particular with a contact surface insert, such as a contact surface rivet. Specifically here, the precisely defined position of the end section, such as the hole for the contact surface insert, helps to improve the current conduction.

[0019] In another embodiment, it is provided that the route has one or more curved portions in one or more planes. Thus, for example, one or more curved portions of the route can be in one plane, while one or more curved portions of the route can be in another plane. The proposed double busbar device is particularly advantageous here because it allows for the replacement of a large number of established power supply cables in the vehicle, making the power routing in the vehicle more compact, safer and more resilient.

[0020] In one embodiment, it is arranged that the total shielding unit mechanically contacts more than half of the outer sides of the first busbar unit and the second busbar unit with its inner surface in a cross-section transverse to the line, particularly on most of its length along the route, particularly at least 80% of its length along the route, and preferably over the entire length along the route. Thus, the total shielding unit circumferentially surrounds the busbar units by more than 180°, preferably more than 185°, and particularly preferably more than 190°. This can also be achieved by the above-described curves in one or more planes of the double busbar device by the following method. This makes the shielding and heat dissipation particularly reliable and increases the bonding strength of the double busbar device by clamping the individual units to the total shielding unit and thus to each other.

[0021] In another embodiment, it is provided that the length of the total shielding unit along the route is at least 50 cm, preferably at least 100 cm, and particularly preferably at least 250 cm. This can also be achieved by the method described below for the above-described curves in one or more planes of the double busbar device. Due to the relatively large achievable length, a particularly large number of established power supply cables in the vehicle can be replaced by the double busbar device described here. This makes the shielding and heat dissipation particularly reliable.

[0022] On the other hand, it relates to a vehicle, in particular an electric vehicle having a double busbar device according to any of the above embodiments. The double busbar device may be installed outside the battery device, for example, outside the housing of the traction battery and / or the main space enclosing the traction battery.

[0023] On the other hand, it relates to a method for manufacturing a double busbar device for a vehicle, in particular for an electric vehicle. The double busbar device has a first busbar unit, a second busbar unit and a total shielding unit. The first busbar unit has an insulated first sheath layer element. The second busbar unit is insulated from the first busbar unit and has an insulated second sheath layer element. The total shielding unit has a tubular shielding element made of solid metal.

[0024] One process step is to provide an unbent, and thus at least substantially straight, first busbar unit and second busbar unit. A subsequent further process step is to insert the two busbar units into an unbent, and thus at least substantially straight, tubular shielding element made of solid metal, thereby leaving a gap between the busbar units (in particular those in mechanical contact with each other) and the tubular shielding element.

[0025] Subsequently, there is a process step of first rolling the tubular shielding element onto the busbar units, wherein the gap between the busbar units and the tubular shielding element is reduced to zero in at least one direction (for example, the above-mentioned thickness direction), such that in a cross-section transverse to the route of the double busbar device, a first part of the inner surface of the total shielding unit contacts the busbar units. The first part can in particular be a large part, for example, at least 50%, or more than 50%, or at least 65%, or at least 80%, or at least 95% of the inner surface. After the first rolling, there is a process step of second rolling the tubular shielding element against the busbar units, wherein another part of the inner surface of the total shielding unit, which is different from the first part, contacts the busbar units. Subsequently, the first part and the other part of the inner surface correspond to a greater part together in a cross-section transverse to the line of the shielded busbar device, in particular more than half of the (respective) outer surfaces of the first busbar unit and the second busbar unit. Thus, the two busbar units are surrounded or clamped by the total shielding unit in the cross-section. The first rolling and the second rolling are respectively performed by a first rolling device and a second rolling device. The rolling in at least two process steps (which can also be carried out in a combined rolling device having two rolling devices) causes the busbar shielding unit to be pressed against the busbar units particularly reliably.

[0026] It can be arranged such that during the second rolling in the region of the directional convergence of the busbar units, the other part of the inner surface contacts the busbar units. Thus, the other part of the inner surface is at least partially convex, that is, partially or completely convex. This particularly strengthens the bonding of the different units of the double busbar device, thereby enhancing the above-mentioned advantages.

[0027] Corresponding to the double busbar device, another process step after the first rolling and the second rolling can be to adapt the route of the double busbar device to a pre-determined route having one or more curved portions in one or more planes by bending. The gap between different units of the double busbar device is reduced or non-existent, reducing the risk of wrinkling or damage to the sheath layer elements and reducing inclusions that would reduce heat dissipation.

[0028] In a particularly advantageous embodiment, the first rolling and / or the second rolling is / are set to be stepwise rolling, wherein the gap is gradually reduced to zero in a number of consecutive sub-rolling steps. Since a particularly high contact pressure can be achieved in this way, different units of the double busbar device can contact each other particularly reliably.

[0029] The advantages and advantageous embodiments of the rear aspect correspond to the advantages and preferred embodiments described in the front aspect, and vice versa.

[0030] The above-described features and combinations of features, including the inventive content of the description, as well as the features and combinations of features disclosed in the specific embodiments or in the individual drawings, can not only be used alone or in the described combinations, but also in combination with other features, or without some of the disclosed features, without departing from the scope of the present invention. Therefore, embodiments that are not explicitly shown and described in the drawings but can be produced by combining the individual features disclosed in the drawings alone are also part of the present disclosure. Therefore, embodiments and combinations of features that do not include all the features of the originally proposed independent claims should also be considered to be disclosed. In addition, combinations of features described that deviate from the subordination of the claims or embodiments and combinations of features that extend beyond these combinations of features will be considered to be disclosed.

[0031] In the context of the present disclosure, the term "transverse / along" can be understood as "at least substantially vertical (perpendicular) / parallel", i.e., "vertical / parallel" or "substantially vertical / parallel", i.e., vertical / parallel except for a pre-determined deviation. For example, the pre-determined deviation can be at most 15°, preferably at most 5°, particularly preferably at most 3°. Therefore, in the context of the present disclosure, "oppositely oriented" can be understood as "at least substantially oppositely oriented", i.e., "at least substantially anti-parallelly oriented". The limitation of "substantially" can also refer to the maximum allowable deviation expressed as a percentage, for example at most 15%, preferably at most 5%, particularly preferably at most 3%. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Exemplary embodiments will be described in more detail below with reference to schematic diagrams. Among them,

[0033] Figure 1a and Figure 1b an exemplary embodiment of the double busbar device is shown in a perspective view and a sectional view;

[0034] Figure 2a and Figure 2b show the manufacturing process of the embodiment of Figure 1a and Figure 1b after insertion and before rolling;

[0035] Figure 3 An exemplary bending process of the double busbar device is shown in a perspective view;

[0036] Figure 4 An exemplary embodiment of the end section of the double busbar device is shown; and

[0037] Figure 5 shows an exemplary rolling device for performing the rolling process steps in a perspective view and a sectional view. Detailed Description

[0038] In the drawings, identical and functionally identical features have the same reference numerals.

[0039] In Figure 1a and Figure 1b an exemplary embodiment of the double busbar device 1 is shown in a perspective view in Figure 1a and in a sectional view in Figure 1b . The double busbar device 1 has a first busbar unit 2 and a second busbar unit 3. The first busbar unit 2 has a first conductor core 2a and an insulating first sheath layer element 2b. The second busbar unit 3 has a second conductor core 3a and an insulating second sheath layer element 3b. The sheath layer elements 2b, 3b electrically insulate the conductor cores 2a, 3a and the busbars 2, 3 from each other. Both busbars 2, 3 follow the route of the double busbar device 1 and extend in the z - direction in this example. The conductor cores 2a, 3a are made of solid metals such as aluminum and / or copper and are thus rigid compared to conductor cores made of conductor braids. Herein, the sheath layer elements 2b, 3b are made of plastic.

[0040] The double busbar device 1 further has a total shielding unit 4, and the total shielding unit 4 has a tubular shielding element 4a made of solid metal such as aluminum. The total shielding unit 4 may also have other elements or components, such as coatings, etc.

[0041] As shown in sub - Figure 1b ), in a cross - section (here in the x - y plane) transverse to the route (in the z - direction), more than half of the outer surfaces 2c, 3c of the first busbar unit 2 and the second busbar unit 3 are in mechanical contact with the inner surface 4b of the total shielding unit 4.

[0042] In the example shown, the busbar units 2, 3 are flat busbar units 2, 3, where the width measured in the width direction (here along the x-direction) is several times the thickness of each of the busbar units 2, 3 measured in the thickness direction (here along the y-direction), for example, more than three times. The busbar units 2, 3 are arranged here with their respective flat sides 2d, 2d', 3d, 3d' abutting against each other, that is, they are placed flat against each other in the x-z plane. The busbar units 2, 3 each have two opposite rounded side surfaces 2e, 3e in a cross-section transverse to the route. These surfaces are circular here, and the radius is half of the thickness of the corresponding busbar unit 2, 3.

[0043] Therefore, in the example shown, half of the outer surface 2c in the y-direction is located above the plane E1 (extending parallel to the x-z plane), and half of the outer surface 3c in the y-direction is located below the plane E2 (also extending parallel to the x-z plane). Since the inner surface 4b of the total shielding unit 4 also makes mechanical contact with the busbar units 2, 3 between the two planes E1, E2, the busbar units 2, 3 make mechanical contact with the total shielding unit 4 with more than half of their respective outer surfaces 2c, 3c. Therefore, the outer surface 4c is concave on the side surface in its central region (here basically oriented along the positive and negative x-directions), and the inner surface 4b is correspondingly convex. This results in a groove 4d appearing in Figure 1a the perspective view. Thus, the total shielding unit 4 surrounds and clasps the busbar units 2, 3.

[0044] The maximum contact area between the outer surfaces 2c, 3c and the inner surface 4b not only improves heat transfer, but also minimizes the heat insulation cavity 5 in the total shielding unit 4, and also increases the bonding of the entire structure: the lateral press fit of the tubular shielding element 4a not only increases the area available for friction between the individual units 2, 3, 4, but also increases the achievable contact pressure of the elements 2, 3, 4 abutting against each other (here mainly acting along the y-direction). The improved bonding prevents adverse effects such as wrinkling or tearing of the sheath layer elements 2a, 3a, for example, avoiding wrinkling or tearing when bending the double busbar device 1, thus avoiding the resulting adverse consequences.

[0045] In Figure 2a the perspective view and Figure 2b the cross-sectional view of Figure 1a and Figure 1bAn embodiment is a manufacturing process after the busbar units 2 and 3 are inserted into the overall shielding unit 4 and before the overall shielding unit 4 is rolled onto the busbar units 2 and 3. Thus, before rolling, the gaps c, c' between the two busbar units 2, 3 and the overall shielding unit 4 are greater than zero. In the first rolling operation, the gaps c, c' can be zero (also stepwise) in at least one direction, for example, the gap c where the overall shielding unit 4 is pressed against the busbar units 2, 3 from above and below (in the y direction) and / or the gap c' where the overall shielding unit 4 is pressed against the busbar units 2, 3 from the side (in the x direction).

[0046] Ideally, rolling is performed in a first step, which is the first rolling for flattening, such that the outer surface 4a in the (x - y) cross-section is convex (at the edges) and flat (in the middle), and in a second step, a second rolling for profiling is performed so that the outer surface 4a in the (x - y) cross-section is also concave, for example, having a groove 4d.

[0047] As Figure 3 shown, this type of double busbar device 1 can be used to simply produce a curve having several curved portions or rounded corners R1, R2 with a low error probability. An example of a curve having a first 90° curved portion R1 in the x - z plane and a second 90° curved portion in the x - y plane is shown.

[0048] Figure 4 An embodiment of the first busbar unit 2 and the second busbar unit 3 together with one (or both) end regions 1a of the double busbar device 1 is shown, where the busbar units 2, 3 project beyond the overall shielding unit 4 and are bent away from the respective other busbar unit 3, 2 in their respective end sections 2f, 3f in one plane (here the (x - z) width plane). Contact surfaces 2g, 3g are arranged in the respective end sections 2f, 3f and are designed to be in electrical contact with the respective busbar units 2, 3.

[0049] In Figure 5a and Figure 5b an exemplary rolling device 10 for performing the rolling process steps is shown in three dimensions in Figure 5a and in Figure 5bis shown in a sectional view. The rolling device 10 has a plurality of rollers 10a, 10b, 10c, 10d by means of which the total shielding unit 4 is pressed against the busbar units 2, 3 from above and below (in the y direction, rollers 10a, 10b) and from the side (in the x direction, rollers 10c, 10d). In the example shown, the two rollers 10a, 10b are substantially flat such that the total shielding unit 4 is pressed against the busbar units 2, 3 from above and below with a flat and concave outer surface 4a (without convex regions). In contrast, the two rollers 10c, 10d are substantially profiled such that the total shielding unit 4 is pressed against the busbar units 2, 3 from the side at least with a convex outer surface 4a in some regions (in this example with grooves 4d).

[0050] In the example shown, an improved, in particular simplified, heavy current routing is thereby achieved.

Claims

1. A double busbar device (1) for a vehicle, in particular for an electric vehicle, having at least: - A first busbar unit (2) having an insulating first sheath layer element (2b); and - A second busbar unit (3) having an insulating second sheath layer element (3b); - Among them, The first busbar unit (2) and the second busbar unit (3) are arranged at least insulated from each other by means of the sheath layer elements (2b, 3b) and follow the route of the double busbar device (1); It is characterized in that - A total shielding unit (4) having a tubular shielding element (4a) made of solid metal, wherein - In a cross-section transverse to the route of the double busbar device (1), the first busbar unit (2) and the second busbar unit (3) are in mechanical contact with the inner surface (4b) of the total shielding unit (4) over a large area with their respective outer surfaces (2c, 3c).

2. The double busbar device (1) according to the previous claim, It is characterized in that The first busbar unit (2) and the second busbar unit (3) are each in mechanical contact with the inner surface (4a) of the total shielding unit (4) with 50% or more of their outer surfaces (2c, 3c).

3. The double busbar device (1) according to any one of the preceding claims, It is characterized in that The busbar units (2, 3) are flat busbar units (2, 3), specifically, the width of the respective busbar unit (2, 3) measured in the width direction transverse to the route is at least twice as large as the thickness of the respective busbar unit (2, 3) measured in the thickness direction transverse to the route and width, preferably at least three times as large or at least four times as large.

4. The double busbar device (1) according to the previous claim, It is characterized in that The busbar units (2, 3) are arranged with their respective flat sides (2d’, 3d) oriented along the thickness direction.

5. The double busbar device (1) according to one of the two preceding claims, It is characterized in that The busbar units (2, 3) each have two rounded side surfaces (2e, 3e), which are arranged opposite to each other in a cross-section transverse to the route, in particular, the radius of the circle by which the rounded side surfaces are rounded is half of the respective thickness.

6. The double busbar device (1) according to any one of the preceding claims, It is characterized in that In one or both end regions (1a) of the double busbar device (1), the first busbar unit (2) and / or the second busbar unit (3) are bent in a plane, preferably in the width plane, and their respective end sections (2f, 3f) are away from the respective other busbar unit (2, 3), and in one or both end regions (1a) of the double busbar device (1), the busbar units (2, 3) protrude beyond the total shielding unit (4).

7. The double busbar device (1) according to the previous claim, It is characterized in that The contact surfaces (2g, 3g) are arranged in the end sections (2f, 3f), in particular with contact surface inserts, such as contact surface rivets.

8. The double busbar arrangement (1) according to any one of the preceding claims, characterized in that the route includes one or more curved portions (R1, R2) in one or more planes.

9. The double busbar arrangement (1) according to any one of the preceding claims, characterized in that the total shielding unit (4) in a cross-section transverse to the line has its inner surface (4b) in contact mechanically with more than half of the outer surfaces (2c, 3c) of the first busbar unit (2) and the second busbar unit (3) over most of its length along the route, in particular over at least 80% of its length along the route, preferably over the entire length along the route.

10. The double busbar arrangement (1) according to any one of the preceding claims, characterized in that the total shielding unit (4) has a length along the route of at least 50 cm, preferably at least 100 cm.

11. A vehicle, in particular an electric vehicle having a double busbar arrangement (1) according to any one of the preceding claims.

12. The vehicle according to the previous claim, characterized in that, The double busbar arrangement (1) is mounted outside the battery arrangement.

13. A method for manufacturing a double busbar arrangement (1) for a vehicle, in particular for an electric vehicle, the double busbar arrangement (1) having a first busbar unit (2), a second busbar unit (3) and a total shielding unit (4), the first busbar unit (2) having an insulating first sheath layer element (2b), the second busbar unit (3) being insulated from the first busbar unit (2) and having an insulating second sheath layer element (3b), the total shielding unit (4) having a tubular shielding element (4a) made of solid metal, the method having the following steps: - providing the first busbar unit (2) and the second busbar unit (3); - inserting the two busbar units (2, 3) into a tubular shielding element (4a) made of solid metal, with a gap (c, c') existing between the busbar units (2, 3) and the tubular shielding element (4a); - Roll the tubular shielding element (4a) onto the busbar unit (2, 3) for the first time, wherein, in at least one direction, the gap (c, c') between the busbar units (2, 3) and the tubular shielding element (4a) is reduced to zero such that in a cross-section transverse to the route of the double busbar arrangement (1), a first part of the inner surface (4b) of the total shielding unit (4) bears against the busbar units (2, 3); - rolling the tubular shielding element (4a) against the busbar units (2, 3) a second time against the busbar units (2, 3), wherein another part of the inner surface (4b) of the total shielding unit (4) different from the first part comes into contact with the busbar units (2, 3).

14. The method according to the previous claim, characterized in that Another part of the inner surface (4b) comes into contact with the busbar units (2, 3) during a second rolling in a zone that extends oriented towards each other.

15. The method according to one of the preceding two claims, characterized in that after the first and second rolling, the route of the double busbar device (1) is adjusted by bending the double busbar device (1) into a predetermined route having one or more curved portions (R1, R2) in one or more planes.

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