Ground structure set for inductive charging device

Abstract

The invention relates to a ground structure set (1) for an inductive charging device (2) for inductive charging of a motor vehicle (4) parked on a base (6), having a flat coil (5) and a core assembly (10) having at least one core body (11) with a central region (18) and at least one edge region (22). The rated power is continuously achieved in as many operating points as possible of the ground structure set (1) by means of a base plate (8), in particular configured as a cooling plate (30), and a holder (12) which holds the flat coil (5) at a distance from the base plate (8), wherein the holder (12) has at least one support (15) which extends from the holding structure (13) to the base plate (8) for supporting the core assembly (11) on the base plate (8), which support is configured as a heat-conducting element (31) and is arranged transversely to the distance direction (7) in the central region (18) of the associated core body (11), which heat-conducting element is made of a material having a thermal conductivity λ > 5 W / (m·K). By this, an arrangement of the support (15) which does not interfere with the magnetic field and an improved cooling can be achieved.

Description

Technical Field

[0001] This invention relates to a ground structure assembly for an inductive charging device used for inductively charging motor vehicles. Background Technology

[0002] In motor vehicles that are at least partially electric, it is necessary to periodically charge the vehicle's electric energy storage device. In principle, a direct electrical connection could be established between the vehicle and an external power source (such as a current connector). However, this requires manual operation by the user.

[0003] Furthermore, it is known that inductive charging is performed on motor vehicles, particularly electric energy storage devices, such as batteries. The corresponding charging equipment has structural assemblies both inside and outside the motor vehicle. A primary coil is located in the structural assembly outside the motor vehicle, and this primary coil works in conjunction with the secondary coil of the structural assembly inside the motor vehicle to charge the energy storage device. The structural assembly inside the motor vehicle is also referred to as the vehicle assembly or "vehicle assembly." During operation, the structural assembly outside the motor vehicle is typically located beneath the motor vehicle and is referred to as the ground assembly or "ground assembly."

[0004] When the charging equipment is in operation, the vehicle to be charged is positioned on the base above the ground structure assembly. Here, the ground structure assembly can be arranged on or within the base. In any case, the ground structure assembly should be designed such that it can, when necessary, bear the load of the vehicle to be charged, which will be charged by the charging equipment. This is particularly important because vehicles travel onto and off the base for charging, and in this context, especially during dispatch, the vehicle may transfer a corresponding load to the ground structure assembly, even if the vehicle itself does not directly transfer a load to the ground structure assembly during the charging process under the intended use. That is to say, ideally, the vehicle does not directly drive over the ground structure assembly, but this is entirely possible, for example, during dispatch. Therefore, the ground structure assembly needs to be designed to accommodate such loads.

[0005] During the operation of the charging equipment, heat is generated in the corresponding structural group, especially in the ground structural group, particularly due to the charging power to be provided. In the case of the ground structural group, this heat can cause an undesirable temperature rise in the ground structural group and / or adjacent items, and consequently, it can also lead to derating of the system (reduction in charging power due to excessive heat in the system) or failure during charging. Summary of the Invention

[0006] Therefore, the present invention addresses the following problem: to provide an improved or at least different implementation of the ground structure assembly for inductive charging devices of the type mentioned at the beginning, the outstanding feature of which is, in particular, the continuous achievement of rated power at as many operating points as possible (mainly high external temperature, high air humidity, and high current in the system).

[0007] The present invention is based on the following general concept: the ground structure assembly according to the invention has a substrate and a core assembly supported above the substrate via at least one support member, the core assembly having, for example, a ferrite plate and a flat coil. When charging, especially electric vehicles, using the ground assembly according to the invention, power transmission is improved by: the substrate being constructed, in particular, as a cooling plate, and at least one support member being constructed as a heat-conducting element, to improve heat dissipation from, for example, the flat coil or the core assembly via at least one support member to the substrate, or to improve heat dissipation or cooling of the flat coil, the core assembly having, for example, a ferrite plate and a substrate. This allows for higher current or higher charging power with the same conductor cross-section or the same current, or the same charging power with a smaller conductor cross-section. To simultaneously avoid affecting, or only affect at the edges, the magnetic field of the flat coil, at least one support member is arranged transversely to the spacing direction in the central region of the core body associated with the core assembly. Thus, the central region is defined by, for example, 80% of the diameter of each core in both the longitudinal and width directions, preferably 70% of the diameter of each core in both the longitudinal and width directions, particularly preferably 50% of the diameter of each core in both the longitudinal and width directions, and even more particularly preferably 30% of the diameter of each core in both the longitudinal and width directions. Here, the core assembly has at least one such core that extends plate-shaped transversely to the spacing direction and has a central region substantially in the middle and edge regions surrounding the central region on the edge sides. In the central region of the respective core (e.g., a ferrite plate), the magnetic flux density generated by the current flowing in the conductor of the flat coil is sufficiently small that even if the thermally conductive support is made of metal, arranging the thermally conductive support in this region is irrelevant in terms of impairing the magnetic flux density. Therefore, with the ground structure assembly according to the invention, it is possible to operate the ground structure assembly at a relatively high charging power, while simultaneously avoiding undesirable temperature rise, especially overheating, which necessitates a reduction in charging power due to said undesirable temperature rise. Therefore, specifically, the ground structure assembly of the inductive charging device according to the invention for inductively charging a motor vehicle parked on a substrate has a substrate, which is particularly constructed as a cooling plate, extending transversely in the spacing direction. Here, the spacing direction is the surface normal of the substrate and is generally perpendicular in the installed state. In addition, the ground structure assembly according to the invention has at least one flat coil, which is constructed as a primary coil or field coil, and has a conductor wound in a particularly helical manner and is spaced apart from the substrate in the spacing direction. Similarly, a core assembly for guiding magnetic current is provided, which is spaced apart from the substrate and the flat coil in the spacing direction and arranged between the substrate and the flat coil. The core assembly has at least one core body having a central region and an edge region, the edge region surrounding the central region on the edge side.In addition, the ground structure assembly according to the invention has a support for holding the core assembly, wherein the support has a holding structure spaced apart from the substrate in the spacing direction, the holding structure being transverse to the spacing direction and positioning each core in the spacing direction. Here, a lower hollow space is constructed between the holding structure and the substrate, in which at least one support member is arranged, such that the at least one support member preferably extends through the lower hollow space in the spacing direction. The support and thus the core assembly are supported on the substrate via the at least one support member. Now, the at least one support member is constructed as a thermally conductive element and is simultaneously arranged transversely to the spacing direction in the central region of the associated core (e.g., a ferrite plate), the thermally conductive element being made of a material having a thermal conductivity λ>5 W / (m·K). Therefore, viewed in the spacing direction, the support member is located in the central region, which opens in a plane transverse to the spacing direction. Here, the support member constructed as a thermally conductive element connects the core assembly to the substrate in a heat-transferring manner. Here, the support according to the invention is used to support the core assembly or the flat coil arranged on the core assembly and simultaneously regulate their temperature by connecting the flat coil or the core assembly and the core body of the core assembly to the substrate in a heat-transferring manner. Therefore, if the core assembly heats up during operation of the ground structure assembly according to the invention, heat dissipation can be achieved via at least one support to the substrate, which is particularly constructed as a cooling plate. Thus, in the case of multiple supports of this type, uniform cooling of the core assembly and the flat coil can be achieved, thereby achieving the same charging power with a smaller cross-section of the conductor of the flat coil, or a higher charging power with the same cross-section of the conductor of the flat coil. Furthermore, by arranging the corresponding support in the spacing direction below the central region of the associated core (e.g., the associated ferrite plate) according to the invention, the support can be positioned relative to the associated core in a region where the magnetic flux density is sufficiently small that no eddy current loss or hysteresis loss occurs when metal material is used in the support. Therefore, field distortion and thus other operating behaviors of the coil system are also prevented, as well as additional heating of the metal material directly through the magnetic field. This type of central region in a flat coil constructed as a primary coil is, for example, explicitly arranged in the middle of the associated ferrite plate or associated core, wherein the spacing between it and the edge of the core (e.g., the ferrite plate) may vary depending on the orientation of the expected primary direction of the magnetic field. That is to say, the edge region of each core (e.g., each ferrite plate) can be individually determined depending on the desired magnetic flux direction or the form of magnetic flux density. Here, the individual cores, such as ferrite plates, are spaced apart from each other transversely to the spacing direction, wherein, transversely to the spacing direction, the magnetic flux density is greater not only between the individual cores but also in the edge regions of the cores than in the corresponding central region of that core.Here, a thermal conductivity λ > 5 W / (m·K) ensures the heat transfer required for adequate cooling of the core assembly or core and flat coil, where different materials can be used, as described in the following paragraphs.

[0008] In an advantageous extension of the solution according to the invention, the thermal conductivity of at least one support member is λ > 10 W / (m·K), particularly λ > 100 W / (m·K). Therefore, iron with a thermal conductivity λ of approximately 80 W / (m·K) and aluminum or steel / stainless steel with a thermal conductivity λ of 235 W / (m·K) can be considered as materials for the respective support members. Theoretically, it is even possible to consider using plastics with corresponding metal particles that can provide the heat transfer required for the desired cooling effect or have a thermal conductivity λ > 5 W / (m·K). By arranging the support members transversely to the spacing direction in the central region of the corresponding associated core according to the invention, it is irrelevant even when using metal, because the magnetic flux density in this central region of the corresponding associated core (e.g., the corresponding ferrite plate) is sufficiently small that the metal body placed there does not cause eddy current losses or damage to the magnetic field. Therefore, with the help of the positioning according to the invention, it is possible for the first time to use metal supports for heat dissipation and thus for heat dissipation or cooling of flat coils or core assemblies, without affecting or only affecting the magnetic field at the edges.

[0009] In an advantageous extension, the substrate has at least one cooling channel for the coolant. This allows for active cooling of the substrate during operation, wherein the thermally conductive support also cools the core assembly or core and the flat coil disposed above the substrate in the mounted state. Furthermore, the actively cooled substrate cools the air in the lower hollow space, thereby cooling the electronic devices disposed there and also the core assembly or core disposed in the lower hollow space.

[0010] The substrate itself is advantageously constructed of metal or a metal alloy, such as aluminum, to improve heat transfer between the coolant, the substrate, the air, and the support. Furthermore, the electromagnetic interaction between the substrate and the flat coils and core components is minimized or at least reduced through the spaced arrangement of the substrate with respect to the core components. Here, the spacing between the substrate and the core components in the pitch direction can be between a few millimeters and a few centimeters. By manufacturing the substrate from metal or a metal alloy, magnetic or electromagnetic shielding of the ground structure assembly downwards towards the substrate is simultaneously achieved.

[0011] In an advantageous extension of the solution according to the invention, at least one support is constructed at least partially of metal, particularly aluminum. Alternatively, it is also conceivable that at least one support is constructed partially of graphite or ceramic, particularly aluminum nitride or aluminum silicide. Here, graphite has a thermal conductivity λ of 15 to 20 W / (m·K), while aluminum nitride ceramics can even have a thermal conductivity λ of 180 W / (m·K). The use of this type of aluminum nitride ceramic is particularly meaningful in situations where a large amount of heat must be dissipated, but where electrical conductivity may not be permitted.

[0012] In another advantageous embodiment of the ground structure assembly according to the invention, at least one support member is constructed in a tubular shape. Theoretically, it is also possible to consider a solid construction of the corresponding support member, or to provide multiple hollow regions extending parallel to each other in the spacing direction. This results in reduced material usage and consequently lower costs. Welding is also facilitated due to increased accessibility.

[0013] In accordance with the intended purpose, a distributor plate (heatspreader) is arranged between at least one support member and the core assembly. This type of distributor plate ensures improved heat transfer and thus improved cooling of the core assembly. It is clear, of course, that if the distributor plate is metallic, it is also arranged in the central region to minimize, in particular, the effect on the magnetic field and thus the generation of eddy current losses.

[0014] In a particularly advantageous embodiment of the invention, the distributor plate is connected to the core assembly via an adhesive layer having a thermal conductivity of λ > 0.8 W / (m·K) and / or a shear modulus of G < 10 MPa. Since the adhesive layer, for example, the bonding material layer, is extremely thin, a reduced thermal conductivity λ of λ > 0.8 W / (m·K) is sufficient. Furthermore, to compensate for the different coefficients of thermal expansion between the core (e.g., the ferrite plate) and the distributor plate, it is advantageous to equip the adhesive material layer, or generally the adhesive layer, with a shear modulus G < 10 MPa.

[0015] In accordance with the intended purpose, the ground structure assembly has a cover plate on the side of the flat coil facing away from the substrate and spaced apart from the flat coil in the spacing direction, wherein an upper hollow space is formed between the retaining structure and the cover plate. In addition, at least one passage can be provided that fluidly communicates the lower hollow space and the upper hollow space. This allows air cooled in the lower hollow space via the substrate, which is particularly configured as a cooling plate, to be guided into the upper hollow space through this passage, thereby effectively cooling the flat coil, which is preferably open towards the upper hollow space. Therefore, with the aid of the upper and lower hollow spaces and at least one passage, the core assembly and the flat coil can be cooled on both sides. Here, the cover plate can be supported on the flat coil or the coil winding carrier of the flat coil via a corresponding support, wherein the support substantially penetrates the upper hollow space between the flat coil and the cover plate in the spacing direction.

[0016] Other important features and advantages of the invention are revealed by the drawings and the accompanying drawings relating to them.

[0017] It is evident that the features mentioned above and those to be described below can be used not only in the given combinations, but also in other combinations or individually, without departing from the framework of this invention. Attached Figure Description

[0018] Preferred embodiments of the invention are shown in the drawings and described in more detail in the following description, wherein the same reference numerals refer to the same or similar or having the same function.

[0019] The attached figures schematically illustrate: Figure 1 A cross-section of the ground structure assembly according to the present invention for an inductive charging device. Figure 2 A heavily simplified schematic diagram of an inductive charging device with a ground structure assembly and a motor vehicle. Figure 3 Bottom view of the core component of the ground structure assembly. Figure 4 Top view of the core component of the ground structure assembly. Figure 5 A cross-section of the ground structure assembly in the area of ​​the supporting members. Figure 6 A cross-section of the support component of the bracket. Figure 7 A cross-sectional view of the ground assembly according to the invention in the region of the support member. Figure 8 Detailed cross-sectional view of the area where the support is attached to the core assembly. Detailed Implementation

[0020] For example in Figures 1 to 8 The ground structure assembly 1 shown in the figure is applied to... Figure 2 In the charging device 2 shown, the charging device is used for inductive charging of the motor vehicle 3. For this purpose, the ground structure assembly 1 and the associated structure assembly 4 of the motor vehicle 3, such as the secondary coil 28, work together. This interaction occurs particularly through the flat coil 1 of the ground structure assembly 1 and the secondary coil 28 of the structure assembly 4 of the motor vehicle 3, the flat coil serving as the primary coil of the charging device 2. The motor vehicle 3 is parked on the base 6 for inductive charging by means of the charging device 2. In the illustrated embodiment, the ground structure assembly 1 is recessed into the base 6, but it can also be arranged on the base.

[0021] The ground structure assembly 1 has a base plate 8, which is particularly constructed as a cooling plate 30. Here, the spacing direction 7 is parallel to the normal to the base plate 6 and extends particularly along the vertical direction. Figure 1 , Figure 7 and Figure 8 A flat coil 5 is arranged on the side of the substrate 8 facing away from the base 6 in the spacing direction 7 and spaced apart from the substrate 8 in the spacing direction 7. The flat coil 5 includes a helically wound conductor 9. Furthermore, the ground structure assembly 1 includes a core assembly 10 having at least one core 11. The core assembly 10 is arranged on the side of the substrate 8 facing away from the base 6 and spaced apart from the substrate 8 in the spacing direction 7. Furthermore, the core assembly 10 is spaced apart from the flat coil 5 in the spacing direction 7. Here, the core assembly 10 having at least one core 11 is arranged between the substrate 8 and the flat coil 5. The core assembly 10, especially at least one core 11, is held in the ground structure assembly 1 and supported on the substrate 8 by means of a bracket 12. For this purpose, the bracket 12 has a holding structure 13 spaced apart from the substrate 8 in the spacing direction 7, wherein at least one core 11 is arranged on the side of the holding structure 13 facing away from the substrate 8 and positioned by the holding structure 13 in a plane extending transversely to the spacing direction 7. The core 11 has a central region 18 and at least one edge region 22. The core can also, in principle, be constructed as a ferrite plate 27. A lower hollow space 14 is provided between the retaining structure 13 and the substrate 8, through which an airflow path 26 can pass, and / or in which at least one electronic component is arranged. Furthermore, the support 12 has at least one support member 15 between the retaining structure 13 and the substrate 8, which extends through the lower hollow space 14 in the spacing direction 7. At least one of the support members 15 is configured as a thermally conductive element 31 and is arranged transversely to the spacing direction 7 within the central region 18 of the associated core 11, connecting the core assembly 11 to the substrate 8 in a heat-transfer manner. This thermally conductive element is made of a material having a thermal conductivity λ > 5 W / (m·K).

[0022] This provides the following significant advantages: via the support 15 configured as a heat-conducting element 31, not only the core assembly, the flat coil 5 along with its conductor 9, but also the core 11, such as the ferrite plate 27, can be connected to the substrate 8, particularly configured as a cooling plate 30, in a heat-transfer manner, thereby enabling effective cooling. Furthermore, by arranging the support 15 transversely to and viewed in the spacing direction 7 within the corresponding central region 18 of the core 11, the effects caused by the magnetic field generated by the flat coil 5, and especially the magnetic flux density, are minimized, making it even possible to consider using metallic materials for the support 15 configured as a heat-conducting element 31 according to the invention. Figure 7 The magnetic field lines are indicated by reference numeral 32 in the attached figure. It is clearly seen that in the region of the support 15, the magnetic field lines 32 extend directly on or within the core 11 and are thus undisturbed even in the case of a metallic support 15, thereby preventing additional eddy current or hysteresis losses in the respective support 15. The corresponding edge regions 22 have different sizes in different directions and also with respect to different orientations of the core 11. It can be seen that the magnetic field lines 32 extend close to or near the lateral edge 33 of the core 11 (e.g., ferrite plate 27), and the magnetic field is thus significantly weakened. This allows the support 15 to be arranged uniformly transversely to the spacing direction 7 on the respective core 11, instead having a central region 18 with a certain size (see attached figure). Figure 4 This allows for individual displacement of the support 15.

[0023] In particular, at least one support member 15 extends in the spacing direction 7 to the substrate 8 and rests on the substrate 8 (see...). Figure 1 , Figure 5 and Figure 7 Or penetrate the substrate (see) Figure 8 The mechanical loads applied to the core assembly 10, particularly by the vehicle 3, are correspondingly and locally transferred through local support provided by at least one support member 15. This localized load transfer results in a reduction in the load on at least one core 11 due to the load transfer. In this way, increased mechanical stability and / or increased service life of the ground structure assembly 1 are achieved. The support member 15 partially fills only the lower hollow space 14, thus preserving a flow space 16 for fluid (air in the illustrated embodiment), thereby allowing the core assembly 10 to transfer heat to the substrate 8 via air. This improves the cooling of the core assembly 11 and the flat coil 5 and thus increases the efficiency of the ground structure assembly 1. Therefore, it is also possible to operate the ground structure assembly 1 at high power, particularly several kW, and thus charge the vehicle to be charged more quickly or without derating at any operating point.

[0024] In the illustrated embodiment, the ground structure assembly 1 has a cover plate 17. Here, the flat coil 5, the core assembly 11, and the support 12 are arranged between the substrate 8 and the cover plate 17. The cover plate 17 is spaced apart from the flat coil 5 in the spacing direction 7, such that an upper hollow space 19 exists between the cover plate 17 and the flat coil 5. In the illustrated embodiment, the lower hollow space 14 and the upper hollow space 19 are fluidly connected to each other via two passages arranged in a width direction 20 extending transversely to the spacing direction 7 outside the core assembly 10 and opposite each other. In the illustrated embodiment, the substrate 8 is constructed as a cooling plate 30, through which cooling channels 25 for the coolant extend. During operation, the coolant actively cools the substrate 8. The actively cooled substrate 8 cools the core assembly 10 and the flat coil 5 via the support 15, and additionally cools the air and thus cools the flat coil 5 and the core assembly 10 again via the air. Here, the substrate 8 is advantageously made of metal or a metal alloy, especially aluminum, to improve heat transfer between the coolant, the substrate 8, and the air. By arranging the substrate 8 spaced apart from the flat coil 5 and the core assembly 10, the magnetic or electromagnetic interaction between the substrate 8 and the flat coil 5 and the core assembly 10 is minimized or at least reduced. Here, the distance between the substrate 8 and the core assembly 10 in the spacing direction 7 can be between a few millimeters and a few centimeters. Magnetic or electromagnetic shielding of the ground structure assembly 1 is simultaneously achieved by manufacturing the substrate 8 from metal or a metal alloy.

[0025] Figure 3 A bottom view of the core assembly 10 with retaining structure 13 is shown. Here, in Figure 3 Only the support 12, core assembly 10, and core 11 (e.g., ferrite plate 27) can be seen in the middle. Figure 4 A top view of the core assembly 10 is shown, in which the core 11 and the support 12 can be seen. Figure 5 A cross-section of ground structure assembly 1 in the area of ​​support member 15 is shown.

[0026] For example, especially from Figure 3 and 5 As can be deduced, the ground structure assembly 1 of the illustrated embodiment exemplarily has eight cores 11, which are rectangular in shape and constructed identically. The corresponding cores 11 are plate-shaped and extend plate-shaped in the width direction 20 and in the longitudinal direction 39, which extends transversely to the width direction 20 and transversely to the spacing direction 7. Advantageously, the corresponding cores 11 are ferrite plates 27 or ferrite ceramic tiles.

[0027] The core 11 can be constructed of soft magnetic materials, especially soft magnetic ferrite.

[0028] As intended, a distributor plate 23 is arranged between at least one support member 15 and the core assembly 10 or retaining structure 13. This type of distributor plate 23 can ensure improved heat transfer and thus improved cooling of the core assembly 10, wherein, it is obviously clear, the distributor plate 23 is also preferably arranged in the central region 18 in order to at least minimize the influence on the magnetic field and thus the generation of eddy current losses.

[0029] In addition, the distributor plate 23 can be connected to the core assembly 10 via an adhesive layer 24, which has a thermal conductivity of λ > 0.8 W / (m·K) and / or a shear modulus of G < 10 MPa. Since the adhesive layer 24, for example, is extremely thin, a reduced thermal conductivity of λ > 0.8 W / (m·K) is sufficient. Furthermore, to compensate for the different coefficients of thermal expansion between the core 11 (e.g., ferrite plate 27) and the distributor plate 23, it is advantageous to equip the adhesive layer, or generally the adhesive layer 24, with a shear modulus G < 10 MPa.

[0030] For example, especially from Figure 1 and Figure 3 as well as Figure 7 As can be deduced from the diagram, the bracket 12 of the illustrated embodiment has at least two support members 15 spaced apart from each other. Here, the support members 15 are each constructed in a columnar shape, and particularly have a columnar shape. In the illustrated embodiment, at least one of the support members 15 is arranged with respect to the middle of the associated core 11, i.e., centrally located in the width direction 20 and the longitudinal direction 39. Viewed in the spacing direction 7, this is within the central region 18. Furthermore, in the illustrated embodiment, each core 11 is associated with a single such support member 15, such that the bracket 12 has a total of eight support members 15 corresponding to the number of cores 11. The respective cores 11 are preferably resting on the associated support members 15. As particularly from the diagram... Figure 3 As can be deduced from this, the corresponding support member 15 is smaller in cross-section than the associated core 11. Here, in the illustrated embodiment, the support member 15 is constructed in the same manner as the core 11. Here, by means of the preferred centrally located arrangement of the support member 15 in the central region 18, a centrally located and locally restricted mechanical load transfer from the corresponding core 11 to the support member 15 is achieved, so that the corresponding bending and tensile stresses acting on the core 11 can be compensated in an improved manner.

[0031] For example, especially from Figure 3As derived therein, for the corresponding core 11, the retaining structure 13 has an opening 34 that fluidly connects the lower side 29 of the core 11 to the lower hollow space 14. Therefore, the air in the lower hollow space 14, especially the air flowing through the lower hollow space 14, directly contacts the lower side 29, and the core 11 can be cooled in an improved manner. For example, it is particularly possible to... Figure 3 As also observed, for the corresponding opening 34, the support 12 has at least one associated diagonal brace 35 for reinforcing and / or mechanically stabilizing the structure 13 in the area of ​​the opening 34 and for supporting the support member 15. In the illustrated embodiment, at least two such diagonal braces 35 are provided for the corresponding opening 34, the diagonal braces being spaced apart from each other. Here, the corresponding diagonal braces 35 extend transversely to the spacing direction 7. Figure 3 In this example, four diagonal braces 35 are provided for seven of the total eight openings 34, and two diagonal braces 35 are provided for one of the openings 34. In the illustrated embodiment, the diagonal braces 35 of the respective openings 34 protrude from the support 15 associated with the associated core assembly 10. The diagonal braces 35, in addition to maintaining the improved mechanical stability of the structure 13, also ensure the swirling flow of air through the lower hollow space 14, and thus ensure improved cooling of the core 11.

[0032] In principle, the corresponding support member 15 can be constructed as a solid structure. For example, from... Figure 6 As can be deduced from this, at least one of the support members 15 may also have at least one hollow region 36 extending in the spacing direction 7, wherein, in Figure 6 The example shows a central hollow region 36 and other hollow regions 36 surrounding the central hollow region, so that a total of nine hollow regions 36 are provided.

[0033] In the illustrated embodiment, it is possible to... Figure 1 , Figure 7 and Figure 8 As derived therein, conductor 9 is received in a plate-shaped flat coil winding carrier 37. The flat coil winding carrier 37 is arranged on the side of the core assembly 10 facing away from the substrate 8. Here, the flat coil winding carrier 37 is at least partially open on the side facing the cover plate 17, so that the conductor 9 of the flat coil 5 is in fluid communication with the upper hollow space 19. Therefore, the flat coil 5 is in contact with the air in the upper hollow space 19, thereby achieving improved cooling of the flat coil 5.

[0034] As from Figure 1As can also be deduced, in the illustrated embodiment, at least one partial support 38 extends in the spacing direction 7 between the cover plate 17 and the flat coil winding carrier 37. In the illustrated embodiment, a plurality of supports 38 are provided, which extend in the spacing direction 7 and are arranged spaced apart from each other. That is, the supports 38 extend parallel to the support member 15. Figure 1 As can also be deduced, in the illustrated embodiment, these supports 38 are constructed identically. The supports 38 are particularly used for load transfer from the cover plate 17 to the flat coil winding carrier 27 and thus via the flat coil winding carrier 38, core assembly 10, and core 11 to the support member 11. In the illustrated embodiment, the corresponding support member 15 is associated with such a support 38 that follows the support member 15 in the spacing direction 7, extending particularly parallel to, for example, coaxially with, the support member 15, so that load transfer occurs as directly as possible from the corresponding support 38 to the associated support member 15. In the illustrated embodiment, the support 38 is here part of the flat coil winding carrier 37.

Claims

1. A ground structure assembly (1) for an inductive charging device (2), said inductive charging device being used to inductively charge a motor vehicle (4) parked on a base (6), The ground structure assembly has a base plate (8) that extends transversely to the spacing direction (7) in a plate-like manner. The ground structure assembly has at least one flat coil (5), the flat coil having a conductor (9) and being spaced apart from the substrate (8) in the spacing direction (7). The ground structure assembly has a core assembly (10) for guiding magnetic current. The core assembly is spaced apart from the substrate (8) and the flat coil (5) in the spacing direction (7) and is arranged between the substrate (8) and the conductor (9). in, The core assembly (10) has a plurality of cores (11), each core extending laterally in a plate-like manner in the spacing direction (7) and having a central region (18) and at least one edge region (22). The ground structure assembly (1) has a support (12) for holding the core assembly (10). The support (12) has a retaining structure (13) that is spaced apart from the substrate (8) in the spacing direction (7) and positions the plurality of cores (11). A lower hollow space (14) is constructed between the retaining structure (13) and the substrate (8). The bracket (12) has at least one support member (15) between the retaining structure (13) and the substrate (8), the support member extending through the lower hollow space (14) in the spacing direction (7). At least one support member (15) is configured as a thermally conductive element (31) and is arranged transversely to the spacing direction (7) in the central region (18) of the associated core (11) and connects the core assembly (10) to the substrate (8) in a way that transfers heat. The thermally conductive element is made of a material having a thermal conductivity of λ > 5 W / (m·K).

2. The ground structure assembly according to claim 1, Its features are, The at least one support member (15) is constructed of a material having a thermal conductivity λ > 10 W / (m·K).

3. The ground structure assembly according to claim 1 or 2, Its features are, The substrate (8) has at least one cooling channel (25) for coolant.

4. The ground structure assembly according to claim 1 or 2, Its features are, The at least one support member (15) is at least partially constructed of metal.

5. The ground structure assembly according to claim 1 or 2, Its features are, The at least one support member (15) is at least partially made of graphite or ceramic.

6. The ground structure assembly according to claim 1 or 2, Its features are, At least one support member (15) is constructed in a tubular or solid manner.

7. The ground structure assembly according to claim 1 or 2, Its features are, At least one of the following components is constructed of or has ferrite: the core assembly (10), the support (12), and / or the retaining structure (13).

8. The ground structure assembly according to claim 1 or 2, Its features are, The substrate (8) is at least partially constructed of aluminum.

9. The ground structure assembly according to claim 1 or 2, Its features are, A distributor plate (23) is arranged between at least one support member (15) and the core assembly (10).

10. The ground structure assembly according to claim 9, Its features are, The distributor plate (23) is connected to the core assembly (10) via an adhesive layer (24) having a thermal conductivity of λ > 0.8 W / (m·K) and / or a shear modulus of G < 10 MPa.

11. The ground structure assembly according to claim 1 or 2, Its features are, An airflow path (26) passes through the lower hollow space (14), and / or at least one electronic component is arranged in the lower hollow space (14).

12. The ground structure assembly according to claim 1 or 2, Its features are, The ground structure assembly (1) has a cover plate (17) on the side of the flat coil (5) away from the substrate (8) and spaced apart from the flat coil in the spacing direction (7). An upper hollow space (19) is constructed between the retaining structure (13) and the cover plate (17).

13. The ground structure assembly according to claim 12, Its features are, At least one passage (21) is provided, which fluidly connects the lower hollow space (14) and the upper hollow space (19).

14. The ground structure assembly according to claim 1, Its features are, The substrate is constructed as a cooling plate (30).

15. The ground structure assembly according to claim 2, Its features are, The at least one support member (15) is constructed of a material having a thermal conductivity λ > 100 W / (m·K).

16. The ground structure assembly according to claim 4, Its features are, The at least one support member (15) is at least partially constructed of aluminum.

17. The ground structure assembly according to claim 5, Its features are, The at least one support member (15) is at least partially constructed of aluminum nitride or aluminum silicide.

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