Electromagnetic induction charging device

Abstract

The invention relates to an electromagnetic induction charging device (1) for inductively charging, in particular contactlessly charging, at least partially electrified motor vehicles (2) using electrical energy, comprising a housing (3) formed in a can-shaped manner, comprising a can bottom (4) and a can neck (5), wherein the can neck (5) facing away from the can bottom (4) surrounds a can opening (6), and comprises a heat-conducting cover (7) covering the can opening (6) and an electromagnetic resonator (11) arranged in the housing interior (8), wherein the housing (3) comprises a thermal insulation member (12) arranged at the can neck (4) and at the can bottom (5) for thermally insulating the housing interior (8) from the external environment (9).

Description

Technical Field

[0001] The invention relates to an electromagnetic induction charging device for inductively charging, in particular contactless charging, an at least partially electrified motor vehicle using electrical energy. Background Art

[0002] For wireless and contactless charging of at least partially electrified motor vehicles, which usually include an electrical energy storage device for storing electrical energy fed to the vehicle during charging, the principle of electromagnetic induction is usually used. Here, for the wireless charging of such motor vehicles, an electromagnetic induction charging device with at least one electromagnetic (transmitter) coil is used, by means of which a current can be induced in at least one electromagnetic (receiver) coil, which is present in the motor vehicle and is electrically connected to the electrical energy storage device. The electrical energy storage device of the motor vehicle can be a traction battery for supplying electrical energy to the electric drive of the motor vehicle. An "at least partially electrified" motor vehicle uses at least electricity as an energy carrier for its drive, but can also use other energy carriers in addition, so that the term explicitly includes pure electric vehicles and hybrid vehicles. In a typical arrangement for wireless charging of at least partially electrified motor vehicles, the electromagnetic induction charging device is mounted on a substrate so that the motor vehicle to be inductively charged can travel above the electromagnetic induction charging device with its bottom on which the electromagnetic receiving coil is present. Such electromagnetic induction charging devices, because they are arranged on a substrate, are also called "ground components". In such a ground assembly, the outer surface of the inductive charging device facing away from the base plate is usually exposed.

[0003] During the operation of such an electromagnetic induction charging device, i.e. during the inductive transmission of electrical energy between the motor vehicle and the induction charging device, the induction charging device generally generates waste heat. In conventional induction charging devices, this waste heat disadvantageously results in the exposed outer surfaces of the induction charging device being able to heat up to surface temperatures exceeding 60° C. However, if a person comes into contact with such hot surfaces intentionally or unintentionally, this poses a high risk of injury. Summary of the invention

[0004] One object of the present invention, in particular in order to eliminate the above-mentioned disadvantages, is therefore to indicate a new approach to electromagnetic induction charging devices for inductively charging at least partially electrified motor vehicles using electrical energy.

[0005] Accordingly, the basic idea of ​​the invention is to equip the housing of an electromagnetic induction charging device with a thermal insulation, by means of which the housing interior delimited by the housing parts is thermally insulated in the housing region. The opening of the housing is closed by means of a heat-conducting cover for cooling the electromagnetic resonator accommodated in the housing interior, so that the cover and the housing together delimit the housing interior in a fluid-tight manner. By means of the thermal insulation of the housing, the heat transfer between the housing interior and the environment surrounding the electromagnetic induction charging device externally is concentrated on the cover, so that the waste heat generated in the operation of the induction charging device is discharged to the environment at least mainly by means of the cover.

[0006] Rather, this means that the heat input into the housing and thus the surface temperature of the exposed outer surface of the housing can be advantageously reduced compared to conventional electromagnetic induction charging devices.

[0007] The electromagnetic induction charging device according to the present invention is used for inductively, especially contactlessly charging the electric energy of at least partially electrified motor vehicles. However, on the contrary, the electric energy can also be transmitted from the motor vehicle to the electromagnetic induction charging device and can be fed into the external power grid by means of the electromagnetic induction charging device, so that the motor vehicle or its energy storage device can be used as a buffer of the external power grid. Therefore, the electromagnetic induction charging device can be configured to transmit electric energy bidirectionally between the motor vehicle and the electromagnetic induction charging device. The electromagnetic induction charging device includes a housing formed in a can-shaped manner, the housing having a can bottom and a can neck, wherein the can neck facing away from the can bottom surrounds the can opening. It should be understood that the term "can bottom" does not establish any positioning thereof relative to the direction of gravity. The electromagnetic induction charging device also includes a heat-conducting cover covering the can opening. In addition, the electromagnetic induction charging device includes an electromagnetic resonator arranged inside the housing for inductively transmitting electric energy to the motor vehicle. Here, the housing has a thermal insulation member, which is arranged at the can neck and the can bottom for thermally insulating the inside of the housing from the external environment. By means of such a thermal insulation, the housing interior can be thermally insulated from the external environment on the housing side, so that the heat transfer between the housing interior and the environment is concentrated on the preferably non-insulated cover. Advantageously, it is thereby achieved that the waste heat generated during the operation of the electromagnetic induction charging device is mostly, preferably predominantly, discharged to the external environment via the cover, so that conversely it can be reliably ensured that the surface temperature of the exposed outer surface of the housing can be kept low, in particular below 60° C. Therefore, the risk of injury from the electromagnetic charging device is advantageously reduced, if not completely eliminated.

[0008] In an advantageous further development of the electromagnetic induction charging device, the cover closes the tank opening in a fluid-tight manner. In doing so, the cover forms a thermal bridge that thermally connects the housing interior to the external environment. As a result, a particularly large proportion of the waste heat generated during operation of the electromagnetic induction charging device can be discharged from the housing interior via the thermal bridge.

[0009] Advantageously, the cover of the electromagnetic induction charging device is formed as a cooling plate. Such a cover formed as a cooling plate enables particularly effective thermal dissipation of waste heat from the interior of the housing. At the same time, such a cooling plate is particularly flat in structure, thereby enabling a relatively small overall height of the electromagnetic induction charging device.

[0010] According to another preferred improvement of the electromagnetic induction charging device, the thermal insulation is arranged on the inner side of the housing facing the interior of the housing. Therefore, the thermal insulation is away from the external environment, so that it can be effectively protected from environmental influences by means of the preferably hard outer shell of the housing. In particular, when a motor vehicle passes by the electromagnetic induction charging device, the thermal insulation can be protected from the mechanical loads to which the electromagnetic induction charging device is subjected.

[0011] In another advantageous improvement of the electromagnetic induction charging device, the heat insulation is arranged on the outer side of the housing facing the external environment. This has the advantage of avoiding a reduction in the volume inside the housing, for example when the heat insulation is arranged on the housing facing the inside of the housing.

[0012] According to another preferred embodiment of the inductive charging device, the thermal insulation element is formed as an insulation layer with a layer thickness of 1 mm to 5 mm. The insulation layer surrounds the housing and / or the bushing housing. Such a thermal insulation element formed as a thermal insulation layer provides an optimal ratio between the consumption of insulation material for forming the insulation layer and the thermal insulation effect that can be achieved by means of the insulation layer.

[0013] In another advantageous development of the electromagnetic induction charging device, it is provided that the housing comprises an inner housing layer and an outer housing layer, between which the thermal insulation element is arranged in a sandwich-like manner. Such a housing has proven to be particularly robust.

[0014] In another preferred embodiment of the electromagnetic induction charging device, the thermal conductivity of the thermal insulation is at most 0.04 W / (m*K). Alternatively or additionally, the thermal conductivity of the cover is at least 20 W / (m*K), preferably at least 100 W / (m*K). This allows the waste heat to be dissipated ideally mainly from the interior of the housing via the cover.

[0015] According to another advantageous improvement of the electromagnetic induction charging device, the thermal insulation part includes an electrically insulating insulating material or consists of such an electrically insulating insulating material. Therefore, the thermal insulation part can also be an electrical insulation part. Preferably, the insulating material is glass wool, rock wool, foam glass, calcium silicate, expanded clay, perlite or a combination thereof. Alternatively or additionally, the cover includes a conductive cover material or consists of such a conductive cover material. Preferably, the cover material is aluminum, copper, steel or a combination thereof. Therefore, in an advantageous manner, both electrical grounding and magnetic shielding of the electromagnetic induction charging device can be achieved in a technically particularly simple manner with the help of the cover.

[0016] In a preferred improvement of the electromagnetic induction charging device, the interior of the housing can be circulated by a working medium so that heat can be transferred from the resonator to the cover in a conventional manner. Advantageously, the interior of the housing is configured so that the working medium can circulate therein to achieve conventional heat transfer. This improves the transfer of heat losses generated at the resonator during operation of the electromagnetic induction charging device to the cover.

[0017] Another preferred improvement of the electromagnetic induction charging device provides that a closed circulation path partially delimited by the resonator is formed inside the housing for transferring heat from the resonator via the cover to the external environment, along which the working medium circulates or can circulate. As a result, a particularly efficient heat transfer from the resonator to the working medium can be achieved due to convection.

[0018] Advantageously, the resonator is arranged in the circulation path so that it is completely surrounded by the circulation path. Advantageously, the resonator is thus surrounded by the working medium flowing through it on all sides in the circulation path, which enables a more efficient heat transfer between the resonator and the working medium.

[0019] According to another preferred improvement of the electromagnetic induction charging device, a conveying device is provided inside the housing, by means of which the working medium can be circulated, thereby generating forced convection from natural convection, thereby further improving the discharge of waste heat.

[0020] Another advantageous improvement of the electromagnetic induction charging device provides that there is at least a first cooling channel inside the housing through which a working medium or a secondary working medium different from the working medium can flow, and the at least first cooling channel is thermally coupled to the resonator for heat transfer between the resonator and the working medium or the secondary working medium. Alternatively or additionally, there is a second cooling channel through which a working medium or a secondary working medium can flow, and the second cooling channel can communicate with the first cooling channel. Preferably, the two cooling channels form a loop in which the working medium or the secondary working medium can flow around the resonator. As a result, a particularly large amount of heat can be dissipated from the inside of the housing.

[0021] In another preferred improvement of the electromagnetic induction charging device, the working medium is a gas, in particular air. Alternatively, the working medium or the secondary working medium is a liquid, in particular a dielectric or conductive liquid. In another alternative, the working medium is a gas and the secondary working medium is a liquid, in particular a dielectric or conductive liquid. With the help of the liquid working medium, the interior of the housing or the resonator arranged therein can be cooled particularly well, however, the components that guide the liquid working medium must be extensively sealed. In contrast, the gaseous medium does allow for a smaller cooling capacity, however, wherein - especially when using air as the working medium - the working medium that is heated due to heat absorption can be guided to the environment in an easily implementable manner together with the heat to be dissipated.

[0022] According to another advantageous improvement of the electromagnetic induction charging device, the electromagnetic induction charging device includes power electronics, which are preferably arranged outside the housing interior or partially arranged inside the housing interior, and most preferably arranged completely outside the housing interior or completely inside the housing interior. Advantageously, the power electronics can thus be integrated into the induction charging device. Here, the power electronics can be protected from environmental influences by means of the housing of the induction charging device and can be cooled by means of the cover of the induction charging device.

[0023] According to another advantageous improvement of the electromagnetic induction charging device, the cover comprises a cavity network, which is suitable for guiding the secondary working medium or for circulating the secondary working medium in the cover. Thus, the cover is prevented from heating up in an impermissible manner. In an advantageous embodiment, the secondary working medium is a liquid, in particular a water-based liquid, preferably an antifreeze water solution. The high specific heat capacity of the liquid makes it possible to discharge the heat transferred from the resonator to the cover by the first working medium within the small installation space of the cavity network in a particularly simple manner. The cavity network in the cover is preferably connected to a conveying device, which enables the secondary working medium to circulate in the cavity network.

[0024] In another preferred improvement of the electromagnetic induction charging device, the electromagnetic induction charging device comprises a subcooler, which is preferably arranged outside the housing interior or partially arranged in the housing interior, and most preferably arranged completely outside the housing interior or completely in the housing interior. Advantageously, heat can be particularly effectively discharged from the working medium or from the secondary working medium to the external environment by means of the subcooler, especially when the working medium circulates in a closed cooling circuit.

[0025] According to another advantageous improvement of the electromagnetic induction charging device, it is provided that the housing comprises a partition wall which divides the interior of the housing into a first compartment and a second compartment. Here, the resonator is arranged in the first compartment, and the power electronics and / or the subcooler are arranged in the second compartment. Such a partition wall has an advantageous reinforcing effect on the housing.

[0026] According to another advantageous development of the electromagnetic induction charging device, the electromagnetic resonator comprises an electromagnetic coil which is preferably wound horizontally in a substantially flat or correspondingly planar manner and a magnetic field conductor which is preferably ferrite. Such a resonator enables particularly efficient inductive transmission of electrical energy.

[0027] In another preferred embodiment of the electromagnetic induction charging device, the thermal insulation completely fills the housing interior so that the remaining components arranged in the housing interior are embedded in the thermal insulation. The components can thus be fixed in the housing interior in a particularly technically easy manner by means of insulation.

[0028] According to another advantageous development of the electromagnetic induction charging device, the electromagnetic induction charging device is designed to be mounted on a base plate, which can be driven over by a motor vehicle to be charged. In this case, in the operating position of the induction charging device, the cover is arranged below the housing in the direction of gravity, and the induction charging device preferably contacts the base plate only by means of the cover. Such an induction charging device allows particularly precise positioning of the motor vehicle to be charged relative to the induction charging device.

[0029] Further important features and advantages of the invention emerge from the dependent claims, the drawings and the associated description of the figures with the aid of the drawings.

[0030] It is to be understood that the features mentioned above and those yet to be explained further below can be used not only in the respectively indicated combination but also in other combinations or alone, without departing from the scope of the present invention.

[0031] Preferred exemplary embodiments of the invention are shown in the drawings and will be explained in more detail in the following description, wherein the same reference numerals indicate identical or similar or functionally identical components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Schematically shown respectively:

[0033] Figures 1 to 9 Each of them is an example of a vertical cross section of an electromagnetic induction charging device according to the present invention in an operating position. DETAILED DESCRIPTION

[0034] Figure 1An example of an electromagnetic induction charging device 1 according to the present invention in an operating position is shown in a cross section along the direction of gravity S. It should be understood that the induction charging device 1 according to the present invention can also be operated in another operating position different from the operating position shown. The electromagnetic induction charging device 1 is used to inductively charge an at least partially electrified motor vehicle 2 with electric energy. With the help of the induction charging device 1, such an at least partially electrified motor vehicle 2 can be inductively charged with electric energy in a wireless manner (contactless in the example shown). To this end, the motor vehicle 2 can include an electric energy storage device, in which electric energy can be stored after inductive charging or during inductive charging, respectively. The energy storage device can be, for example, a traction battery for supplying electric energy to the electric drive of the motor vehicle 2. Conversely, the electromagnetic induction charging device 1 can also be configured to inductively receive electric energy, for example in order to use the electric energy storage device of the motor vehicle 2 as a buffer storage relative to the power grid outside the motor vehicle 2.

[0035] from Figure 1 As can be seen in the figure, the electromagnetic induction charging device 1 includes a housing 3 formed in a can-shaped manner. The housing 3 can have the form of a groove. The housing 3 includes a can bottom 4 and a can neck 5, which protrudes from the can bottom 4 in an angled manner, for example. The can neck 5 surrounds the can opening 6 in a manner away from the can bottom 4. The can bottom 4 can be formed in a flat manner and can have an angular shape, such as a rectangular or circular shape. The electromagnetic induction charging device 1 further includes a heat-conducting cover 7, which is located on the can neck 5 so that it covers the can opening 6. Here, the cover 7 covers the can opening 6, so that the cover 7, together with the housing 3, separates the housing interior 8 from the external environment 9 fluidly. Therefore, the cover 7 closes the can opening 6 in a fluid-tight manner. The external environment 9 surrounds the electromagnetic induction charging device 1. The cover 7 forms, for example, a thermal bridge 10, which thermally couples the housing interior 8 and the external environment 9 to each other, so that the housing interior 8 and the external environment 9 are thermally connected to each other by means of the cover 7. The cover 7 is formed, for example, as a cooling plate.

[0036] also, Figure 1It is shown that an electromagnetic resonator 11 for the inductive transmission of electrical energy to a motor vehicle 2 is arranged in the housing interior 8. In this example, the electromagnetic resonator 11 is thermally coupled to the cover 7 for its cooling. The housing 3 comprises a thermal insulation 12. For the thermal insulation of the housing interior 8 relative to the outer side 14 of the housing 3 facing the external environment 9, the thermal insulation 12 is arranged at the tank neck 4 and at the tank bottom 5. The temperature on the outer side 14 can thus be decoupled from the temperature in the interior 8 and can therefore correspond to the temperature of the environment 9 to the greatest extent possible. In the example shown, the thermal insulation 12 abuts against the tank neck 4 and against the tank bottom 5. The thermal insulation 12 insulates the housing interior 8 from the external environment 9 on the housing side. Here, the thermal insulation 12 insulates the housing interior from the external environment 9 so that it can concentrate the heat transfer between the housing interior 8 and the environment 9 to the thermal bridge 10. Therefore, the main heat transfer path (heat flux) of the electromagnetic induction charging device 1 Following it) extends directly (ie direkt) from cover 7 to environment 9. Cover 7 can thus form a heat sink for inductive charging device 1.

[0037] The thermal insulation member 12 includes, for example, an insulating material that does not contain metal or conductive components. Therefore, the insulating material is, for example, electrically insulating. The insulating material of the thermal insulation member 12 can be flame retardant. The insulating material of the thermal insulation member 12 can be glass wool, rock wool, foam glass, calcium silicate, expanded clay, perlite or a combination thereof. The insulating material can have the form of a semi-finished product. Such a semi-finished product can be a disc, a mat, a pourable material package or a loose filler. Such a semi-finished product can have a honeycomb structure. The semi-finished product can adapt to the structural and mechanical conditions at the installation location to form the thermal insulation member 12 of the electromagnetic induction charging device 1, for example by means of milling, grooving or reinforcement. The insulating material can be porous. The insulating material can be a foam material. The insulating material can have a low thermal conductivity, for example, less than 0.04W / (m*K). The thermal insulation member 12 can have a thickness greater than 0.2mm 2 * Thermal resistance in K / W. The housing 3 can—without taking into account the insulating element 12 —be formed from plastic.

[0038] according to Figure 1 In the example of FIG. 1 , the thermal insulation 12 is arranged on the inner side 13 of the housing 3 facing the housing interior 8. Figure 2 , another example of an inductive charging device 1 according to the invention is shown in a cross section along the direction of gravity S. Figure 1 In contrast to the example Figure 2 In the example of FIG. 4 , the thermal insulation 12 is arranged on an outer side 14 of the housing 3 facing the external environment 9 .

[0039] according to Figure 1 and Figure 2The thermal insulation 12 is formed, for example, as an insulating layer 15. The insulating layer 15 has a layer thickness 16 of, for example, 1 mm to 5 mm, wherein the layer thickness 16 is determined by the minimum extension of the insulating layer 15 measured between the housing interior 8 and the environment 9. Figure 2 In the example of FIG. 3 , the thermal insulation layer 15 surrounds the housing 3 . Figure 1 In the example of , the thermal insulation layer 15 lines the housing 3. The insulation layer 15 can surround or respectively line the housing 3 over the entire surface and can thus substantially completely cover the outer side 14 or respectively the inner side 13 of the housing.

[0040] Figure 3 Another example of an inductive charging device 1 according to the invention is also shown in a cross section along the gravity direction S. Thus, the housing 3 has, for example, a housing inner surface layer 17 and a housing outer surface layer 18. The insulating member 2 is arranged in a sandwich-like manner between the housing inner surface layer 17 and the housing outer surface layer 18, and the thermal insulating member 2 can be the core of a sandwich body of the housing 3, which includes the housing inner surface layer 17, the housing outer surface layer 18 and the insulating member 2. The housing outer surface layer 18 can be formed in the form of a shell.

[0041] Figures 1 to 3 It is further shown that the housing interior 8 can be flowed through by a working medium F, so that heat can be transferred from the resonator 11 to the cover 7 by means of convection via the circulating working medium F. Thus, the waste heat generated by the resonator 11 in operation can first be transferred to the working medium F and discharged from the resonator 11 by means of convection and fed to the cover 7 before being discharged to the external environment 9 by means of the cover 7. For example, there is a conveying device 20 in the housing interior 8, by means of which a circulation 19 of the working medium F can be brought about. The circulation 19 thus produced leads to so-called forced convection, which further significantly improves the heat transfer between the resonator 11 and the working medium F. In the example shown, the conveying device 20 is implemented as a fan. In order to transfer heat from the resonator 11 via the cover 7 to the external environment 9, the housing interior 8 forms a closed circulation path 32 which is partially delimited by the resonator 11. The working medium F circulates along this circulation path 32. Here, in Figures 1 to 3 In the example of , the resonator 11 is arranged in the circulation path 32 in such a way that it is completely surrounded by the circulation path. The circulation 19 can be produced by means of the conveying device 20 .

[0042] exist Figure 8 , another example of an electromagnetic induction charging device 1 according to the invention is shown in a section along the gravity direction S. It can be seen that flow guide elements 31 are present in the housing interior 8 , which influence the circulation 19 of the working medium F.

[0043] Fig. 9Another example of the electromagnetic induction charging device 1 according to the present invention is shown in a cross section along the gravity direction S. According to this example, there is at least a first cooling channel 21 in the housing interior 8 through which the working medium F can flow. In order to transfer heat between the resonator 11 and the working medium F, the first cooling channel 21 is thermally coupled to the resonator 11. There is a second cooling channel 22 in the cover 7 through which the working medium F can flow, which is in fluid communication with the first cooling channel 21. The working medium F can circulate via the first cooling channel 21 and the second cooling channel 22. The second cooling channel 22 and the first cooling channel 21 can therefore be included in a cooling circuit.

[0044] The working medium F is, for example, a gas G, which can be air. Alternatively, the working medium F is, for example, a liquid L, which can be dielectric or conductive. Figures 1 to 3 In the example, the working medium is gas G and Fig. 9 In the example, it is liquid L.

[0045] Figures 4 to 7 Another example of an electromagnetic induction charging device 1 according to the invention is shown in each case in a section along the direction of gravity S. It can be seen that the electromagnetic induction charging device 1 comprises, for example, a power electronics device 23. In these examples, the induction charging device 1 further comprises a subcooler 24, by means of which the heat dissipated from the resonator 11 and the housing interior 8 by means of the cover 7 can be discharged to the external environment 9. The subcooler 24 is therefore used to cool the working medium F. Figures 4 to 7 In the embodiment of the present invention, the secondary working medium F2 flows through the cover 7. The secondary working medium F2 can be guided through the subcooler 24 so that the working medium F can be cooled by means of the secondary working medium F2 and the subcooler 24. The cover 7 can have a cavity network, which is suitable for guiding the secondary working medium F2 or circulating the secondary working medium in the cover 7, respectively. The secondary working medium F2 is, for example, a liquid L, in particular a water-based liquid, preferably an antifreeze water solution. The cavity network exists in the cover 7. The cavity network in the cover 7 is preferably connected to a conveying device, which enables the secondary working medium F2 to circulate in the cavity network. The secondary working medium F2 can be a gas G or a liquid L, in particular a dielectric or conductive liquid. When the working medium F is a gas G, the secondary working medium F2 can be a liquid L.

[0046] Here, according to Figure 4 In the example of FIG. 8 , both the power electronics 23 and the subcooler 24 are arranged completely outside the housing interior 8 . Figure 5 In the example of , the power electronics 23 are arranged partly in the housing interior 8 and partly outside the housing interior 8, wherein the subcooler 24 is completely outside the housing interior 8. In contrast, according to Figure 4In the example of , the power electronics 23 are arranged completely in the housing interior 8 and the subcooler 24 is arranged completely outside the housing interior 8. Figure 7 In the example, again with Figures 4 to 6 In contrast to the example of FIG. 1 , both the subcooler 24 and the power electronics 23 are arranged completely in the housing interior 8 . Figures 4 to 6 Components arranged outside the housing interior 8 can be fixed to a wall of a building.

[0047] Figures 5 to 7 The housing 3 is shown to include, for example, a partition wall 25. The partition wall 25 divides the housing interior 8 into a first compartment 26 and a second compartment 27. Here, the resonator 11 is arranged in the first compartment 26 and at least a part of the power electronics 23 is arranged in the second compartment 27, according to Figure 6 and Figure 7 The entire power electronics 23 is arranged in the second compartment 27. In addition, according to Figure 7 In the example of , the subcooler 24 can be present in the second compartment 27 .

[0048] according to Figures 1 to 9 The electromagnetic resonator 11 of the electromagnetic induction charging device 1 includes an electromagnetic coil 28 and a magnetic field conductor 29. The electromagnetic coil 28 is wound in a flat manner, for example, in a substantially horizontal plane H. The horizontal plane H is a plane whose normal vector extends along the gravity direction S. The magnetic field conductor 28 can be made of, for example, ferrite.

[0049] according to Fig. 9 , for example, thermal insulation 12 completely fills housing interior 8. Here, housing interior 8 is completely filled with thermal insulation 12 so that the remaining components of inductive charging device 1 arranged in housing interior 8 - thus, in Fig. 9 In the example of FIG. 1 , the resonator 11 with the coil 28 and the magnetic field conductor 29 and the second cooling channel 21 are embedded in the thermal insulation 12 .

[0050] also, Figure 8 , such embedding of at least individual component items of inductive charging device 1 present in housing interior 8 is also shown. Thus, coil 28 and magnetic field conductor 29 are embedded in thermal insulation 12 , wherein housing interior 8 is not completely filled with thermal insulation 12 , however.

[0051] The inductive charging device 1 according to the present invention is configured, for example, as Figure 1 The cover 7 is shown mounted on a base plate 30 over which the motor vehicle 2 to be charged can be driven. Figure 1 In the illustrated operating position, it is arranged below housing 3 . The inductive charging device contacts substrate 30 only by means of cover 7 , for example.

Claims

1. An electromagnetic induction charging device (1) for inductively charging an at least partially electrified motor vehicle (2) using electrical energy, - having a housing (3) formed in a can-like manner, comprising a can bottom (4) and a can neck (5), wherein: The tank neck (5) facing away from the tank bottom (4) surrounds the tank opening (6), - having a thermally conductive cover (7) covering the tank opening (6) such that the thermally conductive cover together with the housing (3) delimits a housing interior (8), - having an electromagnetic resonator (11) arranged in the interior (8) of the housing for inductively transmitting electrical energy to the motor vehicle (2), wherein the housing (3) comprises thermal insulation (12) arranged at the tank neck (5) and at the tank bottom (4) for thermally insulating the interior (8) of the housing from the external environment (9), - wherein the electromagnetic induction charging device (1) is arranged to be mounted on a substrate (30) which can be driven over by a motor vehicle (2) to be charged, - wherein, in the operating position of the electromagnetic induction charging device (1), the heat-conducting cover (7) is arranged below the housing (3) in the direction of gravity (S), and the electromagnetic induction charging device (1) contacts the substrate (30) by means of the heat-conducting cover (7), - wherein the interior of the housing (8) can be traversed by a working medium (F) so that heat can be transferred from the resonator (11) to the heat-conducting cover (7) by convection; and - wherein, in order to transfer heat from the resonator (11) to the external environment (9) via the heat-conducting cover (7), the housing interior (8) forms a closed circulation path (32) partially defined by the resonator (11), and the working medium (F) can circulate along the circulation path.

2. The electromagnetic induction charging device (1) according to claim 1, It is characterized in that The thermally conductive cover (7) closes the tank opening (6) in a fluid-tight manner and forms a thermal bridge (10) which thermally connects the housing interior (8) with the external environment (9).

3. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The heat-conducting cover (7) is formed as a cooling plate.

4. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The thermal insulation (12) is arranged on an inner side (13) of the housing (3) facing the housing interior (8).

5. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The thermal insulation (12) is arranged on an outer side (14) of the housing (3) facing the external environment (9).

6. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that - the thermal insulation (12) is formed as an insulating layer (15) with a layer thickness (16) of 1 mm to 5 mm, The insulating layer (15) surrounds and / or lines the housing (3).

7. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The shell (3) comprises a shell inner surface layer (17) and a shell outer surface layer (18), and the thermal insulation member (12) is arranged in a sandwich manner between the shell inner surface layer and the shell outer surface layer.

8. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that - the thermal conductivity of the thermal insulation element (12) is at most 0.04 W / (m*K); or / and - The thermal conductivity of the heat-conducting cover (7) is at least 20 W / (m*K).

9. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that - the insulating material of the thermal insulation (12) is electrically insulating; or / and - The cover material of the thermally conductive cover (7) is electrically conductive.

10. The electromagnetic induction charging device (1) according to claim 1, It is characterized in that A conveying device (20) is located in the housing interior (8), by means of which a circulation (19) of a working medium (F) can be brought about in order to generate forced convection.

11. The electromagnetic induction charging device (1) according to claim 1, It is characterized in that - at least a first cooling channel (21) through which the working medium (F) or a secondary working medium (F2) different from the working medium (F) can flow is present in the interior (8) of the housing, the at least first cooling channel being thermally coupled to the resonator (11) for transferring heat between the resonator (11) and the working medium (F) or the secondary working medium (F2); or / and - at least a second cooling channel (22) is present in the heat-conducting cover (7), through which the working medium (F) or the secondary working medium (F2) can flow.

12. The electromagnetic induction charging device (1) according to claim 11, It is characterized in that - the working medium (F) is a gas (G); or - the working medium (F) or the secondary working medium (F2) is a liquid (L), or The working medium (F) is a gas (G) and the secondary working medium (F2) is a liquid (L).

13. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The electromagnetic induction charging device (1) comprises a power electronic device (23).

14. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The electromagnetic induction charging device (1) comprises a subcooler (24).

15. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that The thermal insulation (12) completely fills the housing interior (8), so that the remaining components arranged in the housing interior (8) are embedded in the thermal insulation (12).

16. The electromagnetic induction charging device (1) according to claim 1, It is characterized in that An at least partially electrified motor vehicle (2) is charged contactlessly using electrical energy.

17. The electromagnetic induction charging device (1) according to claim 6, It is characterized in that The insulating layer (15) surrounds or / and lines the housing (3) over the entire surface.

18. The electromagnetic induction charging device (1) according to claim 1 or 2, It is characterized in that - the insulating material of the thermal insulation member (12) is glass wool or / and rock wool or / and foam glass or / and calcium silicate or / and expanded clay or / and perlite; or / and - The cover material of the heat-conducting cover (7) is aluminum and / or copper and / or steel.

19. The electromagnetic induction charging device (1) according to claim 11, It is characterized in that - the working medium (F) is air; or - the working medium (F) or the secondary working medium (F2) is a dielectric or conductive liquid (L), or The working medium (F) is a gas (G) and the secondary working medium (F2) is a dielectric or conductive liquid (L).

20. The electromagnetic induction charging device (1) according to claim 13, It is characterized in that The power electronics (23) are arranged outside the housing interior (8) or partially in the housing interior (8).

21. The electromagnetic induction charging device (1) according to claim 13, It is characterized in that The power electronics (23) are arranged completely outside the housing interior (8) or completely within the housing interior (8).

22. The electromagnetic induction charging device (1) according to claim 14, It is characterized in that The subcooler (24) is arranged outside the housing interior (8) or at least partially in the housing interior.

23. The electromagnetic induction charging device (1) according to claim 14, It is characterized in that The subcooler (24) is arranged completely outside the housing interior (8) or completely within the housing interior (8).

24. The electromagnetic induction charging device (1) according to claim 1, It is characterized in that - The electromagnetic induction charging device (1) contacts the substrate (30) only by means of the heat-conducting cover (7).

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