Assembly consisting of at least one busbar on a body component of a motor vehicle

Abstract

The invention relates to an assembly (10) consisting of at least one busbar (16) on a body component (12) of a motor vehicle, wherein the busbar (16) is mounted on a floor (22) and a wall (24, 26). The busbar (16) is in the form of a flat conductor and is mounted so as to stand on the floor (22) and on the wall (24, 26), whereby a first narrow side (30) of the busbar (16) faces the floor (22) and one of the broad sides (28) of the busbar (16) faces the wall (24, 26) of the body component (12), and a heat-conducting compound (32) is provided between the busbar (16) and the wall (24, 26) of the body component (12) and / or at least one holding device (20), which holds the at least one busbar (16) and is secured to the body component (12), encloses the at least one busbar (16) on at least three sides in a longitudinal region.

Description

[0001] Lisa Dräxlmaier GmbH

[0002] 10.02.2026 P-0702024-WG-PCT

[0003] 1

[0004] Lisa Dräxlmaier GmbH

[0005] Landshuter Str. 100

[0006] D-84137 Vilsbiburg

[0007] ARRANGEMENT OF AT LEAST ONE POWER LINE ON A BODY COMPONENT OF A MOTOR VEHICLE

[0008] Technical field

[0009] The invention relates to an arrangement of at least one busbar on a body component of a motor vehicle.

[0010] State of the art

[0011] A busbar is a type of electrical busbar designed to transfer electrical energy between components within a vehicle. Busbars are often used to safely conduct electrical current between the high-voltage battery, control unit, drive system, and charging unit. A busbar is a metal sheet or rail made of copper or aluminum used in the vehicle's electrical power distribution system. In particular, the busbar serves as a high-current conductor. The busbar ensures the safe, short-circuit-free transmission of electrical energy.

[0012] During the charging process of a vehicle with very high currents, very large amounts of heat can be generated, primarily due to conductor and contact resistances. This heat can be conducted by the conductor and also absorbed by the conductor due to its heat capacity.

[0013] Description of the invention

[0014] The object of the present invention is to provide a solution by which heat can be dissipated particularly effectively from a busbar of a motor vehicle. Lisa Dräxlmaier GmbH

[0015] 10.02.2026 P-0702024-WG-PCT

[0016] 2

[0017] This problem is solved according to the invention by the subject matter of the independent claim. Further possible embodiments of the invention are disclosed in the dependent claims, the description, and the figures.

[0018] The invention relates to an arrangement of at least one busbar on a body component of a motor vehicle, in particular a passenger car. The busbar is a so-called busbar. The busbar can comprise a core made of aluminum or copper, which is sheathed, in particular overmolded, with an insulating material. The busbar is designed as a flat conductor.

[0019] The arrangement includes the arrangement of at least one busbar on the base and wall of the body panel, with the busbar positioned vertically on the base and wall, such that a first narrow side of the busbar faces the base and one of the broad sides faces the wall of the body panel. Furthermore, a thermally conductive material is arranged between the busbar and the wall of the body panel, and / or at least one retaining device is provided, which holds the busbar and is attached to the body panel, and which encloses the busbar along at least three sides over a certain length.

[0020] In other words, the busbar is attached to the mounting bracket, which in turn is attached to the body panel, thus indirectly holding the busbar to the body panel via the mounting bracket. The mounting bracket allows the busbar to be positioned particularly precisely and securely relative to the body panel.

[0021] The thermally conductive compound allows heat to be transferred particularly efficiently from the busbar to the body panel, thus providing excellent cooling for the busbar. By positioning the busbar vertically on the floor and alongside the wall, and by applying thermally conductive compound between the wall and the busbar, and optionally between the busbar and the floor, a particularly high heat transfer rate from the busbar to the body panel can be achieved, resulting in highly efficient cooling of the busbar. (Lisa Dräxlmaier GmbH)

[0022] 10.02.2026 P-0702024-WG-PCT

[0023] 3

[0024] High heat transfer can be achieved particularly when there is a particularly large contact area between the busbar and the thermal conductivity material, as well as between the body component and the thermal conductivity material.

[0025] Depending on the specific implementation, thermally conductive material may also be provided on the floor between the busbar and the floor of the body component in order to further increase heat dissipation.

[0026] In particular, the thermal interface material has a thermal conductivity of at least 1.3, preferably at least 1.5 or at least 2 watts per meter Kelvin. The thermal interface material preferably has a particularly high thermal conductivity, in particular a thermal conductivity of more than five watts per meter Kelvin, and especially a thermal conductivity of more than 20 watts per meter Kelvin. The thermal interface material can be provided, for example, as a thermal paste, a thermal pad, in nonwoven form (e.g., copper fleece), or as a gap filler.

[0027] Regardless of the other feature combinations presented as advantageous, increased heat dissipation can be achieved simply by means of a lateral boundary wall and, if necessary, also by the floor, even without thermally conductive material. In this configuration, the floor is typically horizontally oriented, as its name suggests, while the wall is vertically oriented, although other orientations are conceivable as long as the floor and wall are linearly independent of each other. Particularly through convection or thermal radiation, increased heat dissipation is possible even without thermally conductive material in such an arrangement, provided that a support structure ensures a secure positioning.

[0028] In a possible further development of the invention, it is provided that the power rail is positioned standing on the floor and on the wall by means of the holding device.

[0029] In this context, it is specifically intended that the holding device completely encloses at least one conductor rail along its entire circumference in a longitudinally extending section. The longitudinal direction of the conductor rail is perpendicular to its cross-section. It is therefore possible that, in a section of the conductor rail's length running in this longitudinal direction, the conductor rail is completely enclosed circumferentially by the holding device. Lisa Dräxlmaier GmbH

[0030] 10.02.2026 P-0702024-WG-PCT

[0031] 4

[0032] This ensures that the busbar is held particularly securely in the mounting bracket. The mounting bracket thus enables exceptionally secure holding and precise positioning of the busbar. With a suitable design, the mounting bracket allows for particularly efficient heat dissipation from the busbar of a vehicle, as the precise positioning enables accurate thermal contact, for example, with a thermally conductive material.

[0033] In a further possible embodiment of the invention, the holding device holds two busbars and projects laterally between them, thereby predetermining a fixed lateral distance between the busbars. In particular, the lateral projection of the holding device between the two busbars allows for the adjustment of the lateral distance between the busbars relative to each other. The holding device can thus enable, firstly, a particularly precise alignment and positioning of the busbars relative to each other and to the wall of the body component, and secondly, precise alignment of the thermal interface material relative to the busbars to achieve efficient heat transfer between the busbars.

[0034] In another possible embodiment of the arrangement, the busbar is recessed in a depression of the body panel. This depression is an outwardly open recess in the body panel. It is essentially an open channel in which the at least one busbar is recessed. The depression thus forms an open cable duct for the at least one busbar located within it. The cross-section of the depression is adapted to the dimensions of the busbar to be recessed within it.

[0035] It is intended that the busbar preferably has an elongated cross-section. In particular, the cross-section of the busbar can have at least substantially the shape of a rectangle.

[0036] The cross-section of the depression preferably lies in a plane defined by a depth direction and a width direction of the depression. The depth direction extends from the bottom of the depression towards the inlet of the depression. In particular, the depth direction is perpendicular to the bottom of the depression. The width direction of the depression extends from one of the Lisa Dräxlmaier GmbH

[0037] 10.02.2026 P-0702024-WG-PCT

[0038] 5

[0039] The depression is defined by the shortest path between the walls of the body panel that define opposite sides and the other of these walls. The longitudinal direction of the depression runs perpendicular to both its depth and width.

[0040] The longitudinal, transverse and deep directions of the depression preferably run parallel to the corresponding longitudinal, transverse and deep directions of the at least one busbar.

[0041] The cross-section of the conductor rail is thus preferably bounded by two opposing, longer broad sides and two opposing, comparatively shorter narrow sides. Each broad side has a greater extent than the respective narrow sides of the conductor rail.

[0042] In this arrangement, at least one conductor rail is preferably positioned vertically in the recess. This positions one of the narrow sides of the conductor rail towards the bottom of the recess. The second narrow side, opposite the first, faces an entrance to the recess. The respective broad sides of the conductor rail face the walls of the body panel that laterally define the recess.

[0043] To ensure particularly efficient heat transfer from the busbar to the body panel, a thermally conductive material is arranged between the busbar and at least one wall of the body panel that defines the recess. The thermally conductive material can be positioned between the first narrow side and the bottom of the recess and / or between one of the broad sides and the wall of the body panel facing that broad side, which laterally defines the recess. The thermally conductive material preferably rests against both the busbar and the wall of the body panel that defines the recess, thus enabling particularly efficient heat transfer from the busbar to the body panel.

[0044] The busbar can be positioned within the recess using the holding device. This allows the busbar to be positioned, at least substantially, centrally within the recess with respect to its cross-section. In particular, the holding device allows the busbar to be positioned within the recess in such a way as to... Lisa Dräxlmaier GmbH

[0045] 10.02.2026 P-0702024-WG-PCT

[0046] 6

[0047] This ensures that the busbar has a particularly large contact area with the thermal interface material. If the thermal interface material, in turn, makes contact with the body panel over a particularly large area of ​​the walls defining the recess, then particularly good heat transfer and, consequently, particularly efficient cooling of the busbar can be achieved. Furthermore, the geometric design of the holding device allows for precise control over the relative position of the busbar held within the recess relative to the recess itself.

[0048] If the holding device protrudes between two busbars arranged in the recess, the thermal conductivity can be positioned along the longitudinal direction of the recess between the two busbars.

[0049] This arrangement enables particularly efficient cooling of the busbar, allowing for the transmission of exceptionally high currents within the vehicle. Because the busbar is positioned in the recess of the body panel, rather than simply resting on a flat surface, a particularly large area of ​​the busbar's outer surface can be thermally connected to the body panel via the thermally conductive compound. This allows for the transfer of exceptionally high heat flows from the busbar to the body panel, resulting in particularly efficient cooling of the body panel.Furthermore, the risk of damage to the power rail recessed in the depression is particularly low, as the power rail is enclosed over a particularly large area of ​​its circumference by the walls of the body component that define the depression and is thus protected from mechanical impact.

[0050] In another possible embodiment of the invention, two busbars are arranged vertically and recessed side by side in the depression. Neither busbar protrudes beyond the entrance of the depression. The busbars are arranged vertically side by side such that each faces one of its broad sides towards the other busbar. All broad sides of the busbars thus overlap each other along a line running in the width direction. In particular, the busbars have the same cross-section and completely overlap each other in the width direction of the depression. This allows, among other things, the following to be achieved: Lisa Dräxlmaier GmbH

[0051] 10.02.2026 P-0702024-WG-PCT

[0052] 7

[0053] The design aims to protect both busbars from damage by having their respective walls of the body panel define the recess. Furthermore, it ensures that both busbars can be cooled particularly efficiently due to excellent heat transfer to the body panel. Alternatively or additionally, a thermally conductive material is applied between the busbar and both walls of the body panel defining the recess. This allows a significant amount of heat to be dissipated from the busbar to the body panel via both walls defining the recess. Consequently, the busbar can be cooled particularly quickly and efficiently.

[0054] In this context, it may be particularly useful to arrange thermally conductive material between the two busbars. This thermally conductive material can be the same material used between at least one busbar and at least one wall of the body panel that defines the recess, or it can be a different thermally conductive material. The thermally conductive material allows heat to be conducted between the busbars particularly efficiently, thus effectively compensating for temperature differences between them. In this way, heat can be transferred from the first of the two adjacent busbars to the second via the thermally conductive material.Both busbars can dissipate heat to the body panel via their narrow side facing the bottom of the recess or via their broad side facing away from the other busbar, which is positioned against a wall of the body panel that defines the recess, using the same or different thermal conductivity materials. This allows both busbars recessed in the recess to be cooled particularly efficiently.

[0055] In another possible embodiment of the invention, the entrance to the recess is covered by a cover, whereby the at least one busbar is completely enclosed around its circumference by the respective walls of the body component and the cover that define the recess. This means that the at least one busbar in the recess is completely enclosed by the walls defining the recess in combination with the cover. The cover prevents the ingress of dust, dirt, and / or moisture into the recess. The busbar can thus be particularly well protected from contamination. Furthermore, the cover allows the Lisa Dräxlmaier GmbH [company name] to be located in the recess.

[0056] 10.02.2026 P-0702024-WG-PCT

[0057] 8

[0058] At least one busbar must be particularly well protected against mechanical damage.

[0059] Regardless of this, even if no recess is provided, a suitable cover can be provided between two brackets. In particular, the cover can also cover both the wide and narrow sides that are not in contact with the floor or wall, respectively, so that the entire busbar, or even several busbars held by the brackets, is covered between these two brackets.

[0060] Furthermore, this design provides that the cover has at least one filling port, which is configured to allow the thermal interface material to be poured into the recess while the at least one busbar is positioned within it. Using the filling port, the thermal interface material can be precisely poured into predetermined areas of the recess to ensure that the busbar located within the recess is thermally connected to the body panel in these areas. This allows the at least one busbar to be precisely positioned within the recess, and then thermal interface material to be poured via the filling port between the busbar and at least one wall defining the recess, or between two busbars.

[0061] In a further possible embodiment of the invention, the cover has at least one protrusion on its side facing the bottom of the recess, enabling the cover to adjust different fill levels of the thermal conductivity in different areas of the recess. By means of the protrusion, together with at least one of the busbars and optionally additionally with one of the walls of the body component that defines the recess, a volume within the recess can be defined, which is to be filled, or is filled, with the thermal conductivity. Here, the protrusion of the cover limits this volume upwards in the direction of the recess's inlet. The deeper the protrusion of the cover extends into the recess, the lower the resulting fill level of the thermal conductivity filled into the recess.The bulge can alternatively or additionally be used to apply heat-conducting compound already introduced into the depression with pressure to Lisa Dräxlmaier GmbH.

[0062] 10.02.2026 P-0702024-WG-PCT

[0063] 9

[0064] to apply pressure in order to compress them and / or to reliably apply them over a flat area to at least one of the busbars and / or to at least one of the walls bordering the sink in order to enable efficient heat conduction.

[0065] In a further possible embodiment of the invention, the holding device, together with at least one other component, completely closes off a cross-section of the sink. This allows two longitudinal sections of the sink, arranged one behind the other in the sink's direction, to be separated from each other, for example, in a liquid-tight manner, and in particular, a fluid-tight manner. This makes it possible, for example, to fill the sink with thermally conductive material only in one of the longitudinal sections, while the other longitudinal section of the sink remains free of the thermally conductive material. This allows the thermally conductive material to be arranged, or present, only in precisely defined areas within the sink.

[0066] Depending on the specific implementation, the brackets and the cover(s) can enclose a suitable space with the floor and only one wall, which is sufficiently shielded and / or sufficiently liquid-tight to be, for example, decayed.

[0067] In another possible embodiment of the invention, the body component is a die-cast component. In particular, the body component can comprise aluminum, for example in the form of an aluminum alloy. The body component is thus manufactured using a die-casting process. Die casting enables the body component to be manufactured with a particularly precise geometry. Furthermore, the body component manufactured using the die-casting process can have a greater wall thickness than, for example, a body component manufactured from sheet metal by forming. Due to the greater wall thickness of the body component, heat can be dissipated from the heat sink particularly quickly. Consequently, the at least one busbar arranged in the heat sink can be cooled particularly efficiently.

[0068] Further advantages, features, and details of the invention may become apparent from the following description of possible embodiments and from the drawings. The features and combinations of features mentioned above in the description, as well as those described below in the figure description and / or in the drawings, are provided by Lisa Dräxlmaier GmbH.

[0069] 10.02.2026 P-0702024-WG-PCT

[0070] 10

[0071] The features and combinations of features shown in the figures alone can be used not only in the combinations shown, but also in other combinations or on their own, without leaving the scope of the invention.

[0072] Brief character description

[0073] The drawing shows in:

[0074] Fig. 1 shows a perspective exploded view of two busbars, two holding devices and a thermal conductivity material for a motor vehicle;

[0075] Fig. 2 shows a perspective partial section view of an arrangement comprising a busbar, thermal conductivity and retaining devices from Fig. 1, which are arranged in a recess of a body component of the motor vehicle;

[0076] Fig. 3 shows a perspective exploded view of the holding device in a first embodiment;

[0077] Fig. 4 shows a perspective exploded view of the holding device in a second embodiment;

[0078] Fig. 5 shows a schematic sectional view of the body component and the two busbars arranged in the recess of the body component in the immediate vicinity of a holding device of the first embodiment;

[0079] Fig. 6 shows a schematic sectional view of the body component with the busbars arranged in the recess in the vicinity of the holding device of a third embodiment;

[0080] Fig. 7 shows a schematic perspective view of the holding device of the third embodiment;

[0081] Fig. 8 shows a cutaway perspective view of the body component and the conductor rails arranged in the recess in the immediate vicinity of the holding device of the first embodiment; Lisa Dräxlmaier GmbH

[0082] 10.02.2026 P-0702024-WG-PCT

[0083] 11

[0084] Fig. 9 shows a schematic sectional view of the busbars arranged in the depression, wherein the busbars arranged in the depression are covered by a cover;

[0085] Fig. 10 a schematic perspective view of the cover from a slant above;

[0086] Fig. 11 shows a schematic perspective view of the cover from a low angle; and

[0087] Fig. 12 shows a process diagram for a process in which two busbars are arranged in the recess of the body component, the recess is covered by means of the cover and thermal conductivity is poured into the recess.

[0088] The figures contain identical elements with the same reference symbols.

[0089] Figure 2 shows a sectioned perspective view of an arrangement 10 for a motor vehicle. Individual components of this arrangement 10 are shown in an exploded view in Figure 1. The arrangement 10 comprises a body component 12, which in this case is an aluminum die-cast component. This body component 12 has a recess 14 in which at least one, in this case two, busbars 16 are arranged side by side and completely recessed. The busbars 16 are busbars. The recessed arrangement of the busbars 16 in the recess 14 means that none of the busbars 16 protrudes beyond an inlet 18 of the recess 14. The recess 14 is open to the surroundings via the inlet 18. Furthermore, several retaining devices 20 can be seen in Figure 2, which are designed to hold the busbars 16 and position them within the recess 14.For this purpose, the retaining devices 20 are designed to be attached to the body component 12.

[0090] The depression 14 has a longitudinal direction L, a transverse direction B perpendicular to it, and a depth direction T perpendicular to both the longitudinal direction L and the transverse direction B. The depth direction T runs along the shortest path from a floor 22 of the depression 14 towards the entrance 18 of the depression 14. The transverse direction B runs along the shortest path from a first wall that bounds the depression 14 on one side. Lisa Dräxlmaier GmbH

[0091] 10.02.2026 P-0702024-WG-PCT

[0092] 12

[0093] 24 of the body component 12 to a second wall 26 of the body component 12, which limits the depression 14 to a second side opposite the first side.

[0094] As can be seen particularly well in Fig. 2, the two busbars 16 are arranged side by side in the recess 14 in the width direction B. Each busbar 16 has a cross-section that is at least substantially rectangular. With their elongated cross-section, the busbars 16 are arranged vertically side by side in the recess 14 and in the width direction B. The vertical orientation of the respective busbars 16 in the recess 14 means that the busbars 16 are arranged in such a way that the longer edges of the respective cross-section of the busbar 16 are aligned parallel to the depth direction T, and the shorter edges are aligned parallel to the width direction B. The longer edges of the respective cross-section of the busbars 16 are referred to as the broad sides 28. The shorter edges are referred to as the respective narrow sides 30.In the illustration shown in Fig. 2, it is particularly evident that each of the busbars 16 is bounded on opposite sides in the width direction B by respective broad sides 28. Furthermore, each busbar 16 has two opposite narrow sides 30 that bound the respective busbar 16 in the depth direction T. The upright arrangement of the busbars 16 within the depression 14 thus means that the respective first narrow sides 30 of the busbars 16 face the bottom 22 of the depression 14, and the respective other narrow sides 30 face the inlet 18 of the depression 14. Furthermore, each busbar 16 is oriented with one of its broad sides 28 facing the other busbar 16.The respective other broad sides 28 of each of the conductor rails 16 are oriented towards the respective walls 24, 26 of the body component 12 that laterally delimit the depression 14. The conductor rails 16 are arranged side by side in the lateral direction B, whereby the broad sides 28 of the conductor rails 16 overlap each other along the lateral direction B, in particular completely overlap each other, with the conductor rails 16 having the same cross-section.

[0095] In order to cool the busbars 16 particularly efficiently, it is provided that between the respective busbars 16 and at least one wall of the body component 12 defining the depression 14 - and thus between the respective Lisa Dräxlmaier GmbH

[0096] 10.02.2026 P-0702024-WG-PCT

[0097] 13

[0098] A thermally conductive compound 32 is arranged between the busbar 16 and the floor 22 and / or the first wall 24 and / or the second wall 26. To further ensure particularly good temperature equalization between the two busbars 16, the thermally conductive compound 32 is also arranged between the two busbars 16 in the lateral direction B. The larger the area of ​​contact between the respective thermally conductive compound 32 and the busbars 16, the better the heat transfer from the busbars 16 to the thermally conductive compound 32. Thus, heat can be dissipated from the busbars 16 by means of the thermally conductive compound 32, thereby cooling the busbars 16.

[0099] The thermally conductive material 32 can be provided by at least one gap pad. By means of the thermally conductive material 32, which is arranged in the lateral direction B between the two busbars 16, temperature differences between the busbars 16 can be particularly well compensated. By means of the thermally conductive material 32, which is arranged in the depth direction T or in the lateral direction B between the body component 12 and the respective busbar 16, a thermal connection of the respective busbar 16 to the body component 12 is achieved. With respect to the longitudinal direction L, the thermally conductive material 32 can be arranged only sectionally or continuously in the recess 14 and be in contact with at least one busbar 16.In addition to conducting heat away from the respective busbars 16, the thermally conductive compound 32 can also serve as a support for the busbars 16 by adhesively bonding it to the body component 12 and at least one of the busbars 16. Alternatively or additionally, the thermally conductive compound 32 can be used to locally influence the natural frequency of the busbar 16 and / or generally to act as a vibration and rattle damping material. By applying thermally conductive compound 32 to defined areas of the respective busbars 16, a specific natural frequency of each busbar 16 can be set to prevent continuous excitation of the busbar 16 during operation and thus during use in a motor vehicle.

[0100] Arrangement 10 enables optimal thermal connection of the busbars 16, which in this case are flat conductors, to the periphery, in this case the body component 12 of the motor vehicle, particularly in areas of the body component 12 where the body component 12 has a particularly large wall thickness. This particularly large wall thickness of the body component 12 enables particularly efficient heat conduction for particularly rapid heat dissipation, as well as a particularly Lisa Dräxlmaier GmbH

[0101] 10.02.2026 P-0702024-WG-PCT

[0102] 14

[0103] high thermal heat capacity, which means that a particularly large amount of heat can be absorbed by means of the body component 12.

[0104] As can be seen in Fig. 2, it is provided here that at least in a longitudinal section along the longitudinal direction L the two conductor rails 16 are each in contact with the thermal conductivity 32 at least with their narrow side 30 facing the bottom 22 of the depression 14 and with their two broad sides 28, in particular at least over a large part of the height of the respective conductor rails 16 extending in the depth direction T, whereby both conductor rails 16 can be cooled particularly easily and efficiently by means of the thermal conductivity 32 by conducting heat away from the conductor rails 16 into the body component 12.

[0105] Furthermore, a cover 34 can be seen in Fig. 2, which is designed to cover the entrance 18 of the recess 14. The cover 34 is designed to be attached to respective retaining devices 20, whereby the cover 34 can be held on the body component 12 by means of the retaining devices 20. By covering the entrance 18 of the recess 14 with the cover 34, the busbars 16 arranged in the recess 14 are completely enclosed on their circumference by the respective walls of the body component 12 that define the recess 14 – namely the base 22, the first wall 24 and the second wall 26 – as well as by the cover 34, in the length of the recess 14 where the entrance 18 is covered upwards by the cover 34. In particular, the cover 34 covers the inlet 18 of the sink 14 in a length region along the longitudinal direction L in which the thermal conductivity 32 is arranged in the sink 14.This means that the thermally conductive compound 32 is covered outwards in the depth direction T by the cover 34. A retaining device 20 can be arranged at each of the front and rear ends of this length, to which the cover 34 is attached at its respective ends. This means that the cover 34 is attached at its front end (in the length direction L) to a first retaining device 20 and at its rear end (in the length direction L) to a second retaining device 20. The retaining devices 20 are specifically designed to fill, together with the busbars 16 held by the respective retaining device 20, a cross-section of the depression 14 extending perpendicular to the length direction L, at least substantially completely.This ensures that an area within the depression, in which the thermal conductivity 32 is arranged, extends upwards along the depth direction T from Lisa Dräxlmaier GmbH.

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[0108] The volume within the recess 14, in which the thermal conductivity 32 is to be arranged, is limited by the cover 34 and is further limited along the longitudinal direction L to the front and rear by the respective retaining devices 20. Thus, the volume within the recess 14, in which the thermal conductivity 32 is to be arranged, is limited in different directions by the retaining devices 20 and the cover 34, thereby minimizing the risk of the thermal conductivity 32 escaping from this confined volume. This ensures that the thermal conductivity 32 is and remains contained within the recess 14 only in precisely defined areas.

[0109] The cover 34, two retaining devices 20, the two busbars 16, and the thermal conductivity 32 are shown in an exploded view in Fig. 1. As can be seen particularly well in Fig. 1, the two busbars 16 are arranged to run parallel to each other in the longitudinal direction L. The cover 34 can be configured to ensure adequate filling of the recess 14 with the thermal conductivity 32 in the area of ​​desired heat transfer optimization. Furthermore, the cover 34 can be used to hold the busbars 16 in position. In addition, the cover 34 can have features of a filling aid, as described below.

[0110] Figures 3, 4, and 7 show different embodiments of the respective holding devices 20. The embodiments in Figures 3 and 7 differ with respect to the fastening mechanism of the respective holding device 20 to the body component 12, while the holding devices 20 in the embodiments shown in Figures 3 and 4 differ with respect to the holding mechanism for the busbars 16. With respect to the holding mechanism for the busbars 16, the first embodiment shown in Figure 3 and the third embodiment shown in Figure 7 are identical. With respect to the fastening mechanism of the respective holding device 20 to the body component 12, the first embodiment shown in Figure 3 and the second embodiment shown in Figure 4 are identical.

[0111] The holding device 20 shown in Fig. 3 is designed in two parts and comprises a holder 36 and a hold-down device 38. The holder 36 is designed to grip and hold the busbars 16. The hold-down device 38 is designed to hold the holder 36 and to be attached to the body component 12. The holder 36 has several arms 40, one of which is designed to extend in the lateral direction B between the two

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[0113] 16

[0114] to be inserted into the busbars 16. The two outer arms 40 are designed to be placed against the respective opposite broad sides 28 of the busbars 16. The middle arm 40 is designed to be placed against the two opposite broad sides 28 of the busbars 16. The holder 36 thus has a shape that is at least substantially E-shaped, with the respective arms 40 of the holder 36 projecting from the retainer 38 when the holding device 20 is used as intended, particularly in the depth direction T. In the embodiment of the holding device 20 shown in Fig. 3, the holder 36 is made in one piece. The holder 36 can be easily attached to the busbars 16, which are already aligned parallel to each other, regardless of whether the busbars 16 are already arranged in the recess 14 or not.This makes assembly of the arrangement 10 particularly simple, since the busbars 16 are either first connected to the at least one holding device 20 and then arranged in the recess 14 or are first arranged in the recess 14 and then connected to the at least one holding device 20.

[0115] The arms 40 are designed at their respective free ends such that they partially encompass the narrow sides 30 of the busbars 16 facing the bottom 22 of the recess 14. To enable the holder 36 shown in Fig. 3 to be attached to the busbars 16 while the busbars 16 are already arranged in the recess 14, a soft component can be provided on at least one of the arms 40. This soft component yields, at least briefly, when the holder 36 is connected to the respective busbar 16, allowing the busbar 16 to slide between two adjacent arms 40 of the holder 36. Upon reaching an end position of the busbar 16 in the holder 36, the arms 40 bear against the busbars 16 along the entire length of the respective broad sides 28 of the busbars 16 in the depth direction T.

[0116] In the second embodiment shown in Fig. 4, the holder 36 is designed in two parts, with a first retaining element 42 and a second retaining element 44. The retaining elements 42 and 44 are designed to be attached to or wrapped around the busbars 16 from opposite sides in the depth direction T. Each of the retaining elements 42 and 44 has a projection 46, which is designed to be inserted between the busbars 16. For a secure connection of the first retaining element 42 with the Lisa Dräxlmaier GmbH

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[0118] 17

[0119] The retaining elements 42 and 44 can be clipped or snapped together with the second retaining element 44. Together, the retaining elements 42 and 44 can completely enclose both busbars 16 along their entire circumference in a longitudinal section L. The projections 46 allow the retaining elements 42 and 44 to individually and completely encircle each busbar 16. The retaining elements 42 and 44 can be configured to completely cover or fill a cross-section of the depression 14 along a longitudinal section of the depression 14, together with the busbars 16.If several holding devices 20 are provided, which are arranged in the longitudinal direction L at a distance from each other within the depression 14, then the engagement of the projections 46 between the busbars 16 and the complete encirclement of the busbars 16 can ensure that the thermal conductivity 32 can be precisely positioned along the longitudinal direction L within the depression 14 by means of the holding devices 20, since the risk of thermal conductivity 32 escaping from the specified length range can be particularly well avoided due to the complete covering of the cross-section of the depression 14 by the holding elements 42, 44 and the busbars 16.

[0120] In the embodiment shown in Fig. 3, the busbars 16 are covered or enclosed by the holder 36 on at least three sides, whereas in the second embodiment shown in Fig. 4, the busbars 16 are completely enclosed by the holder 36 over their entire circumference. A lateral distance between the busbars 16 in the width direction B can be adjusted and predetermined by means of the projections 46 or by means of the middle arm 40, which, when used as intended, is arranged between the busbars 16 in the width direction B.

[0121] The hold-down device 38 shown in Figures 3 and 4 is designed to be connected to the body component 12 via two fastening points 48 by means of a force-fit, positive-fit, and / or material-fit connection. In particular, it can be provided that the hold-down device 38 is screwed or welded to the body component 12 at each of the fastening points 48. Furthermore, the hold-down device 38 has two openings 50, and the holder 36 has two pins 52 projecting along the depth direction. Each of the pins 52 is designed to be inserted into one of the associated openings 50 of the hold-down device 38 in the depth direction T. Lisa Dräxlmaier GmbH

[0122] 10.02.2026 P-0702024-WG-PCT

[0123] 18

[0124] When the respective holding device 20 is used as intended in the recess 14, the respective pins 52 protrude in the depth direction T beyond the entrance 18 of the recess 14. Because the holder 36 is inserted with its two pins 52 into the respective associated openings 50 of the hold-down device 38, the hold-down device 38 is secured relative to the holder 36 against rotation about an axis running parallel to the depth direction T.

[0125] The respective holders 36 are designed such that their outer contour is adapted to an inner contour of the recess 14 of the body component 12 and are partially or completely flush with the inner contour of the recess 14. In particular, the holder 36 is designed to fit snugly against both the respective busbars 16 and the respective walls of the body component 12 that define the recess 14, in order to limit the flow of the thermal conductivity 32 in the longitudinal direction L. After the busbars 16 have been arranged parallel to each other, the holder 36 is folded around them, and this assembly is then placed in the recess 14. The retainer 38 can be connected to the holder 36 by means of joining points, either force-fit, positive-fit, and / or material-fit. The holder 36 can be designed as a single piece or in multiple parts.The retaining device 20 can be locked to the body component 12 by means of the hold-down device 38. To allow the holder 36 to be subsequently placed onto the busbars 16, even when they are already arranged in the recess 14, rather than having to be threaded onto them, it can be designed, as shown in Figures 3 and 7, such that it has openings 54 on at least one side. These openings are defined by the respective arms 40, allowing the busbars 16 to slide between the arms 40 through the openings 54. The contouring of the arms 40 enables the formation of undercuts 56, which allow the holder 36 to hold the busbars 16 securely in position along the depth direction T.

[0126] Figure 5 shows a cutaway view of the holding devices 20 of the first embodiment installed in the recess 14. Figure 7 shows an embodiment of the holding device 20 in which the holder 36 is formed in one piece with the three arms 40 projecting along the depth direction T, with only one pin 52 projecting upwards in the depth direction T on the holder 36. This pin 52 is inserted into an associated opening 50 of the hold-down device 38. [Lisa Dräxlmaier GmbH]

[0127] 10.02.2026 P-0702024-WG-PCT

[0128] 19

[0129] With one opening 50 of the hold-down device 38 inserted, the hold-down device 38 can be rotated relative to the holder 36 about an axis running parallel to the depth direction T. A receptacle 58 can be arranged on the body component 12 for each end of the elongated, rod-shaped hold-down device 38 to secure this retaining device 20. The respective receptacles 58 are specifically designed to cover the respective associated end of the hold-down device 38 along the depth direction T towards a side facing away from the recess 14, thereby preventing the hold-down device 38 from lifting off the holder 36 or the retaining device 20 from coming loose from the recess 14. The arrangement shown in Fig. 6 is shown in Fig.Figure 7 shows the holding device 20 in a state attached to the body component 12, in which the respective ends of the hold-down device 38 are covered by the receptacles 58 along the depth direction, thus securely holding the holding device 20 to the body component 12. By rotating the hold-down device 38 about the axis parallel to the depth direction T relative to the holder 36 or relative to the body component 12, the respective ends of the hold-down device 38 can be inserted into the receptacles 58. The axis of rotation about which the hold-down device 38 can be rotated relative to the holder 36 can be arranged centrally to the holder 36, particularly with respect to the width direction B. For installation of the holding device 20, the hold-down device 38 is slightly rotated about this axis of rotation, pushed into its end position with respect to the depth direction T, and then positively and / or non-positively locked to the receptacles 58 by rotating it back about the axis of rotation.

[0130] Figures 5 and 6 thus show the respective retaining devices 20 in their installed state and therefore at least partially seated in the recess 14, holding the busbars 16. The respective hold-down devices 38 can rest on the body component 12 and project beyond the body component 12 in the depth direction T, or – as shown in Figure 4 – rest in a recess 60 of the body component 12, whereby the hold-down device 38 is at least substantially flush with a surrounding area of ​​the body component 12.

[0131] The design stipulates that the recess 14 has a basic rectangular or trapezoidal cross-sectional shape. Local features such as blind holes, negative partial spherical cutouts, or similar features can be integrated. The cross-sectional shape of the recess 14 is determined in particular by the manufacturing process of the body component 12 and thus by any draft angles that may be required. The recess 14 can have one or more sections, segments, or subdivisions.

[0132] 10.02.2026 P-0702024-WG-PCT

[0133] 20

[0134] It is possible that the recess 14 is designed with a cross-section such that a fin or a hump is provided in the lateral direction B between the adjacent conductor rails 16, and thus the respective walls bounding the recess 14 have a W-shape in cross-section instead of a U-shape. This allows for a particularly large surface area of ​​the walls of the body component 12 bounding the recess 14, which in turn enables particularly good heat transfer from the conductor rails 16 to the body component 12. The fin or hump can only be located in certain areas between the conductor rails 16. This means that in a depth region extending along the depth direction T of the recess 14 in the lateral direction B, there is no area of ​​the wall of the body component 12 bounding the recess 14.In other words, a wall of the body component 12 bounding the recess 14 can project only partially between the busbars 16 with respect to the depth direction T. It can be provided that a retaining device 20 used in this embodiment of the recess 14 holds only one of the busbars 16. In other words, in this embodiment of the recess 14, in which the wall of the body component 12 bounding the recess 14 projects partially between the busbars 16, at least one separate retaining device 20 can be provided for each of the busbars 16. Alternatively, in this embodiment, a separate holder 36 can be provided for each of the busbars 16, with each of these holders 36 holding one of the busbars 16. Two of the holders 36, each holding one of the busbars 16, can be attached to the body component 12 by means of a common retainer 38.The hold-down device 38 can therefore be designed in the form of an overlapping clamp.

[0135] The illustration in Fig. 8 shows a sectional view of the two busbars 16 arranged side by side in the recess 14, the busbars 16 being held by a retaining device 20 of the first or third embodiment. It can be clearly seen that the respective free ends of the arms 40 of the holder 36 are designed such that they partially engage the respective narrow sides 30 of the busbars 16 facing the bottom 22 of the recess 14. The respective arms 40 are designed to allow for a spring travel when the arms 40 are inserted onto the busbars 16, specifically when the respective arms 40 are inserted between the body component 12 and the respective busbars 16 or between the busbars 16 themselves. Lisa Dräxlmaier GmbH

[0136] 10.02.2026 P-0702024-WG-PCT

[0137] 21

[0138] This can be achieved through the geometric design of the arms 40 or the walls of the body component 12 that define the recess 14. In particular, it is provided that a soft component is arranged on at least one of the arms 40, or that at least one of the arms 40 is designed with a soft component that allows the arms 40 to move along the spring travel specified for the respective arm 40 when the holder 36 is attached to the busbars 16.

[0139] In Fig. 9, the busbars 16 are shown recessed in the recess 14. The busbars 16 are held on the body component 12 by means of a retaining device 20 of the first or second embodiment. Furthermore, the busbars 16 are covered from above by the cover 34 in a longitudinal section of the recess 14. As can be seen particularly well in Fig. 9, the cover 34 is designed to be attached to the retaining device 20, in particular to the retainer 38. In the embodiment of the cover 34 shown in Fig. 9, it has three filling ports 62 through which the thermal conductivity 32 can be poured into a volume kept free within the recess 14.The respective filling ports 62 thus allow the thermal conductivity 32 to be poured into the recess 14, while the busbars 16 are already positioned in the recess 14 and covered upwards along the depth direction T by the cover 34. The filling ports 62 enable the thermal conductivity 32 to be poured into a cavity between the body component 12 and the busbars 16, their respective retaining devices 20, and the cover 34. The cover 34 allows the position and fill level of the thermal conductivity 32 poured into the cavity to be defined. The cover 34 can be attached to the body component 12 together with the retainer 38. As shown in Fig.As can be seen particularly well in Figure 9, the cover 34 is provided with ribs 64 on its underside facing the busbars 16. These ribs are designed to be positioned against the busbars 16 along the top side along the depth direction T. This means that the ribs 64 are designed to be positioned against the second narrow sides 30 of the respective busbars 16. The cover 34 can have one rib 64 for each busbar 16, with each rib 64 having a longitudinal extension direction running in the length direction L. Because each rib 64 rests against one of the busbars 16, the busbars 16 are prevented from floating when the space between them is filled with the thermally conductive compound 32. The cover 34 is shown in Figure 10 from an oblique top view. (Lisa Dräxlmaier GmbH)

[0140] 10.02.2026 P-0702024-WG-PCT

[0141] 22

[0142] Figure 11 shows the area from a low angle. In this low angle view, the ribs 64, which project downwards from the cover 34 along the depth direction T, are particularly visible. Furthermore, the respective protrusions 66, which also project downwards along the depth direction T and thus towards the bottom 22 of the recess 14, are particularly visible in Figure 11. The respective protrusions 66 extend along the longitudinal direction L and are designed, when used as intended, to be positioned along the lateral direction B between the conductor rails 16 and between the conductor rails 16 and the respective walls 24, 26 of the body component 12 that define the recess 14.The protrusions 66 can serve to compress the thermally conductive compound 32 in the depth direction T and / or to define a maximum fill level of the thermally conductive compound 32 along the depth direction T. The protrusions 66 thus act as fill level ribs, the extent of which can vary in the depth direction T depending on the design. These protrusions 66 promote uniform filling of the space along the longitudinal direction L, while different fill levels for the thermally conductive compound 32 can be defined by means of the protrusions 66 in the lateral direction B.

[0143] Figure 12 shows a process diagram for a manufacturing process for the arrangement 10. In the process diagram shown, the busbars 16 are aligned parallel to each other by means of several holding devices 20. The busbars 16 are then positioned within the recess 14 by attaching the holding devices 20 to the body component 12. Subsequently, the spaces between the busbars 16 and the respective walls of the body component 12 that define the recess 14 are filled with the thermally conductive material 32, at least along a section of the recess 14. The thermally conductive material 32 can be arranged, for example, in the form of at least one, and in particular several, gap pads in the recess 14. Finally, the inlet 18 of the recess 14 can be covered and thus closed by means of the cover 34.

[0144] Alternatively, it is possible to first arrange the cover 34 above the busbars 16 - thereby closing the inlet 18 of the recess 14 - and then to apply the thermally conductive compound 32 via the filling nozzles 62 of the cover 34 between Lisa Dräxlmaier GmbH

[0145] 10.02.2026 P-0702024-WG-PCT

[0146] 23

[0147] the conductor rails 16 or between the respective conductor rail 16 and the walls of the body component 12 that define the depression 14.

[0148] During a charging process with very high currents, large amounts of heat are generated, primarily due to conductor and contact resistances. This heat can be conducted by the busbars 16 themselves and also absorbed by the busbars 16 due to their heat capacity. The described arrangement 10 enables the integration of the busbar 16 with optimized heat transfer into adjacent components or assemblies, in this case the body panel 12, which serves as a heat sink. The busbars 16 are integrated vertically, i.e., oriented upright, into the recess 14 of the body panel 12 and fixed in this recess 14. In this case, the body panel 12 consists of a die-cast part with significantly increased wall thicknesses and correspondingly increased heat capacity compared to sheet metal. The busbars 16 are connected to the body panel 12 via thermal conductivity systems, in this case the thermally conductive compound 32.The optional cover 34 protects an area of ​​the busbars 16 coated with thermally conductive compound 32 and, due to its shape, ensures optimal filling conditions for the thermally conductive compound 32. The arrangement 10 enables the provision of a high-performance charging system, which can meet high demands regarding charging characteristics. Due to the particularly efficient heat transfer from the busbars 16 to the body component 12, the busbars 16 can be designed with a particularly small cross-section.

[0149] Overall, the invention demonstrates how busbars – and thus the busbars 16 – can be thermally connected to the body component 12 in a vertical orientation. Lisa Dräxlmaier GmbH

[0150] 10.02.2026 P-0702024-WO-PCT

[0151] 24

[0152] REFERENCE MARK LIST

[0153] 10 Arrangement

[0154] 12 Body component

[0155] 14 depression

[0156] 16 busbar

[0157] 18 Entrance

[0158] 20 Holding device

[0159] 22 Floor

[0160] 24 first wall

[0161] 26 second wall

[0162] 28 broadside

[0163] 30 narrow side

[0164] 32 Thermal conductivity

[0165] 34 Cover

[0166] 36 holders

[0167] 38 hold-down devices

[0168] 40 Arm

[0169] 42 first retaining element

[0170] 44 second retaining element

[0171] 46 lead

[0172] 48 Mounting point

[0173] 50 opening

[0174] 52 pens

[0175] 54 Opening

[0176] 56 Undercut

[0177] 58 recording

[0178] 60 In-depth study

[0179] 62 Filler necks

[0180] 64th rib

[0181] 66 bookings

[0182] T Depth direction

[0183] L Longitudinal direction

[0184] B Latitude direction

Claims

Lisa Dräxlmaier GmbH 10.02.2026 P-0702024-WG-PCT 25 PATENT CLAIMS 1. Arrangement (10) of at least one conductor rail (16) on a body component (12) of a motor vehicle, wherein the conductor rail (16) is arranged on a floor (22) and a wall (24, 26), wherein the conductor rail (16) is designed as a flat conductor and is arranged standing on the floor (22) and on the wall (24, 26), whereby a first narrow side (30) of the conductor rail (16) faces the floor (22) and one of the broad sides (28) of the conductor rail (16) faces the wall (24, 26) of the body component (12), - wherein a thermal conductivity material (32) is arranged between the busbar (16) and the wall (24, 26) of the body component (12) and / or - wherein at least one retaining device (20), which holds the at least one (16) and is attached to the body component (12), encloses the at least one busbar (16) in a length range at least on three sides.

2. Arrangement (10) according to claim 1, characterized by the fact that by means of the holding device (20) the power rail (16) is positioned standing on the floor (22) and on the wall (24, 26).

3. Arrangement (10) according to claim 1 or 2, characterized by the fact that the holding device (20) which completely encloses at least one conductor rail (16) over a length range.

4. Arrangement (10) according to any one of the preceding claims, characterized by the fact that the holding device (20) holds two conductor rails and projects between the two (16), whereby a lateral distance between the (16) is fixed by means of the holding device (20).

5. Arrangement (10) according to any one of the preceding claims, characterized by the fact that the busbar (16) is recessed in a recess (14) of the body component (12) Lisa Dräxlmaier GmbH 10.02.2026 P-0702024-WG-PCT 26 is arranged, wherein the conductor rail (16) is arranged standing in the depression (14), whereby the first narrow side (30) of the conductor rail (16) is arranged facing the bottom (22) of the depression (14), a second narrow side (30) opposite the first narrow side (30) is aligned towards an entrance (18) of the depression (14) and respective broad sides (28) of the conductor rail (16) are aligned towards the respective walls (24, 26) of the body component (12) that laterally delimit the depression (14).

6. Arrangement (10) according to claim 5, characterized by the fact that in the recess (14) two (16) are arranged recessed, which are aligned standing next to each other, and / or a thermal conductivity material (32) is arranged between the conductor rail (16) and both walls (24, 26) of the body component (12) that define the recess (14).

7. Arrangement (10) according to claim 4 or according to claim 6, characterized by the fact that is arranged between the two (16) thermal conductivity materials (32).

8. Arrangement (10) according to claim 5 or 6 or according to claim 7 with reference to claim 6, characterized by the fact that the inlet (18) of the recess (14) is covered by a cover (34), whereby the at least one (16) is completely enclosed around its circumference by the respective walls of the body component (12) and the cover (34) that define the recess (14), wherein the cover (34) has at least one filling nozzle (62) which is configured to allow the thermal conductivity (32) to be filled into the recess (14) while the at least one (16) is positioned in the recess (14).

9. Arrangement (10) according to claim 8, characterized by the fact that the cover (34) has at least one bulge (66) on its side facing the bottom (22) of the depression (14), whereby the cover (34) Lisa Dräxlmaier GmbH 10.02.2026 P-0702024-WG-PCT 27 is set up to adjust different fill levels of the thermal conductivity (32) in different areas of the sink (14).

10. Arrangement (10) according to any one of claims 5, 6, 8 or 9 or according to claim 7 with reference to claim 6, characterized by the fact that the holding device (20) together with the at least one (16) completely closes a cross-section of the depression (14).

11. Arrangement (10) according to any one of the preceding claims, characterized by the fact that the body component (12) is a die-cast component.

Images