Mobile inductive charging device

Abstract

The invention relates to a mobile inductive charging device (1) for an inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), comprising an induction coil (2) for receiving an alternating magnetic field, a support structure (4) for attaching the inductive charging device (1) to a vehicle (5), which has several supports (6) extending in a support area (7), and several plate-shaped magnetic field conductors (8) extending above the induction coil (2), wherein two of these supports (6) are adjacent in the support area (7) in the circumferential direction (U), are inclined to each other and form a support space (9) between them in the support area (7), wherein one of the magnetic field conductors (8) is arranged in the area of ​​the support space (9). Improved positioning compared to a stationary induction charging device can be achieved if the mobile induction charging device (1) has at least one positioning coil (12) for sending and / or receiving a magnetic positioning field, if this positioning coil (12) is arranged below a magnetic field conductor (8) and above or below the induction coil (2), and if this positioning coil (12) is arranged completely within the carrier space (9).

Description

[0001] The present invention relates to a mobile inductive charging device according to the preamble of claim 1, which is preferably used in an inductive vehicle charging system for charging the battery of a battery-electric vehicle. The invention further relates to a vehicle equipped with such a mobile inductive charging device and to an inductive vehicle charging system equipped with such a mobile inductive charging device.

[0002] Such a vehicle charging system comprises a stationary inductive charging unit, also known as a ground assembly, which is typically fixed in place, for example at a parking space, and connected to an electrical power grid, and a mobile inductive charging unit, also known as a vehicle assembly, which is attached to the vehicle. The mobile inductive charging unit is connected to the vehicle's battery in a suitable manner, for example via a corresponding vehicle-side charging control unit. To charge the battery, the vehicle with its mobile inductive charging unit is positioned relative to the stationary inductive charging unit in such a way that charging occurs via induction, i.e., via a magnetic or...An electromagnetic alternating field allows electrical energy to be transferred from the stationary inductive charging device to the mobile inductive charging device. With an inductive vehicle charging system, charging plugs that need to be inserted into vehicle charging sockets are no longer required.

[0003] A mobile induction charging device of this type is known, for example, from DE 10 2019 212 277 A1 and comprises an induction coil for receiving an alternating magnetic or electromagnetic field, which extends in a coil plane perpendicular to the vertical direction of the induction charging device. Furthermore, the mobile induction charging device is equipped with a support structure for attaching the induction charging device to a vehicle, which has several supports extending in a support area parallel to the coil plane. In addition, several plate-shaped magnetic field conductors are provided, each extending above the induction coil parallel to the coil plane. At least two of these supports are adjacent in the circumferential direction within the support area, are inclined relative to each other, and form a gap between them within the support area.One of the magnetic field conductors is then arranged in the area of ​​the respective carrier gap.

[0004] During operation of the inductive vehicle charging system, electrical energy is transferred between the stationary and mobile inductive charging units via an alternating magnetic or electromagnetic field at high electrical power. This can be problematic if foreign objects are present in this field. Electrically conductive foreign objects, especially metallic ones, can heat up in the alternating magnetic or electromagnetic field, creating a risk of burns and, in particular, a fire hazard. This can be remedied by foreign object sensors, which consist of several sensors distributed across the surface of the stationary inductive charging unit. These sensors can be designed as magnetic field sensors that generate and monitor a magnetic or electromagnetic field. As soon as an electrically conductive foreign object enters this magnetic or electromagnetic field, the sensors detect and detect the foreign object.When an electromagnetic field is encountered, the field changes, which is then detected by the respective foreign object detection unit. This foreign object sensor allows such objects to be detected in time, thus reducing the risk of injury and fire.

[0005] For efficient energy transfer during charging, it is important with such an inductive vehicle charging system that the vehicle, with its mobile inductive charging unit, is positioned as centrally as possible above the stationary inductive charging unit. To optimally position the mobile inductive charging unit relative to the stationary inductive charging unit, it is generally possible to utilize existing foreign object sensors already present on the stationary inductive charging unit for other purposes. In particular, it is conceivable to attach a position sensor to the vehicle that simulates a virtual foreign object, which can then be detected by the foreign object sensors of the stationary inductive charging unit. If an evaluation unit knows the position of the foreign object sensors on the stationary inductive charging unit, the relative position of the virtual foreign object with respect to the stationary inductive charging unit can be determined.Furthermore, if the relative position of the position sensor with respect to the mobile induction charging unit is known, the relative position of the mobile induction charging unit with respect to the stationary induction charging unit can also be determined based on the determined position of the virtual foreign object. A problem with using such position sensors and foreign object sensors for aligning the stationary and mobile induction charging units is that the induction charging units have a comparatively large number of interfering contours, which make it difficult to generate and detect the virtual foreign object and thus significantly impair the accuracy of the position detection. Interfering contours of the mobile induction charging unit include, for example, the magnetic field conductors and the support structure.

[0006] The present invention addresses the problem of providing an improved or at least a different embodiment for a mobile inductive charging device and a vehicle and / or vehicle charging system equipped therewith, which is characterized in particular by a relatively precise positioning capability between stationary and mobile inductive charging device.

[0007] This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

[0008] The invention is based on the general concept of integrating at least one position sensor into the mobile inductive charging device. Furthermore, this integration is achieved such that a positioning coil of the respective position sensor is arranged both below a magnetic field conductor and above or below the induction coil. The respective positioning coil is also arranged within a support cavity. Positioning the respective positioning coil within this cavity significantly reduces the interfering influence of the support structure on the position field. Positioning the respective positioning coil below the magnetic field conductors also reduces their influence on the position field. This allows the respective positioning coil to radiate downwards virtually unimpeded to generate the virtual foreign object that can then be detected by a foreign object sensor.

[0009] Specifically, the invention proposes an induction charging device comprising at least one positioning coil for transmitting and / or receiving a magnetic or electromagnetic positioning field. Furthermore, the respective positioning coil is arranged vertically below such a magnetic field conductor and above or below the induction coil. In addition, the respective positioning coil is arranged completely within such a support space. Consequently, the respective positioning coil is not covered vertically by the supports that define the respective support space.

[0010] The mobile inductive charging device has a vertical direction, which, when mounted on the vehicle, runs essentially vertically, i.e., parallel to the direction of gravity. Furthermore, the mobile inductive charging device has a longitudinal direction, perpendicular to the vertical direction, and a transverse direction, perpendicular to both the vertical and transverse directions. Since the mobile inductive charging device is expediently located on the underside of a vehicle, particularly on the underbody, it is designed to be flat, so that its height, measured vertically, is significantly less than its length, measured longitudinally, and also significantly less than its width, measured transversely. In this context, the relative positions "bottom" and "top" refer to the vertical direction, which, when properly functioning, is aligned parallel to the direction of gravity.A plane spanned by the longitudinal and transverse directions, in which the mobile inductive charging device extends, then runs horizontally.

[0011] The magnetic field conductors preferably consist of a soft magnetic and preferably electrically insulating material. The relative permeability µ r The magnetic field strength should be greater than 2 and preferably greater than 1000. Suitable materials include ferrites, which is why these plate-shaped magnetic field conductors are often referred to as ferrite plates.

[0012] A preferred embodiment is one in which the positioning coil is arranged vertically between such a magnetic field conductor and the induction coil. This provides better protection for the positioning coil from the alternating field of the induction coil. Additionally or alternatively, the positioning coil can be arranged vertically entirely within the support structure, resulting in a compact, space-saving design.

[0013] According to an advantageous embodiment, the support structure can have an inner frame that radially connects two or more or all supports with respect to a central axis of the induction charging device that runs parallel to the vertical direction. The space between the supports is then radially bounded by the inner frame. This ensures that the positioning coil arranged in the space between the supports is not obscured by the inner frame in the vertical direction. The inner frame can be plate-shaped or ring-shaped. A plate-shaped frame is closed in the plane in which it extends. Therefore, the plate-shaped or closed frame has no opening that penetrates the frame perpendicular to the plane of the frame. In contrast, a ring-shaped frame is open in the plane of the frame and thus has at least one opening that penetrates the frame perpendicular to the plane of the frame.The ring-shaped frame runs circumferentially around the opening, preferably closed. The ring-shaped frame does not necessarily have to have a circular outer contour, but can have a rectangular, square, polygonal, or trapezoidal outer contour.

[0014] Additionally or alternatively, according to another embodiment, the support structure can have an outer frame that radially connects two or more or all supports to each other with respect to a central axis of the induction charging device that runs parallel to the vertical direction. The respective space between the supports is then radially limited by the outer frame. This ensures that the positioning coil arranged in the respective space between the supports is not obscured by the outer frame in the vertical direction. The outer frame can be annular and, in particular, can be completely enclosed in the circumferential direction.

[0015] In principle, the positioning coil can have any geometry suitable for generating the position field. For example, the positioning coil can be circular, elliptical, or oval. In an advantageous embodiment, the positioning coil can have a contour laterally or perpendicular to the vertical direction, which is geometrically adapted to a circumferential contour of the respective support space, bounded laterally or perpendicularly to the vertical direction by the support structure. Accordingly, the positioning coil follows the circumferential contour within the support space, resulting in a comparatively large surface area for the positioning coil, which is advantageous for generating an easily recognizable position field.

[0016] According to another embodiment, the positioning coil can have two coil sections extending parallel to one of the two supports that define the space between the supports in which the positioning coil is arranged. This optimally utilizes the available space for the positioning coil within the support space. Advantageously, the positioning coil can be triangular or trapezoidal in shape.

[0017] In another embodiment, the respective positioning coil can be formed on a positioning coil carrier, which is arranged in the respective support cavity. The use of a positioning coil carrier simplifies the arrangement of the positioning coil in the respective support cavity. For example, the positioning coil carrier can be equipped with the respective positioning coil before installation in the support structure. The positioning coil carrier can be a circuit board onto which the respective positioning coil is applied, in particular printed.

[0018] In an advantageous embodiment, the positioning coil carrier can have a central through-opening. This allows the positioning coil carrier to be configured not as a plate, but as a ring, and to have a polygonal, particularly trapezoidal, outer contour. This design requires very little material for the positioning coil carrier, which reduces manufacturing costs and also the weight of the mobile inductive charging device.

[0019] According to a particularly advantageous embodiment, it can also be provided that the induction coil or an induction coil support is bonded or potted to the respective magnetic field conductor through the through-opening. This gives the through-opening of the positioning coil support an additional function. Bonding or potting the induction coil or the induction coil support to the respective magnetic field conductor improves thermal coupling, enabling heat transfer from the induction coil to the respective magnetic field conductor. Adhesives or potting materials with an increased thermal conductivity coefficient can be used for this purpose. An increased thermal conductivity coefficient λ is present when λ > 1 W / (m·K), preferably λ > 10 W / (m·K).

[0020] In another embodiment, control lines for controlling the respective positioning coil can be provided, which are routed through the support structure to an area located above the magnetic field conductors. The control lines thus run within the support structure, specifically between the inner and outer frames and between adjacent supports, and therefore in a space-saving manner.

[0021] A particularly advantageous embodiment is one in which the respective control circuit comprises several electronic components, wherein at least one component is arranged on a positioning coil carrier that supports the positioning coil, while at least one other component is arranged on a circuit carrier located in an area above the magnetic field conductors. Control lines can then lead from the positioning coil carrier through the support structure to the circuit carrier. By dividing the control circuit onto at least two different carriers, the available installation space can be utilized more effectively. Furthermore, this reduces disruptive interactions, especially thermal and / or electromagnetic interactions.

[0022] A preferred embodiment includes at least one position sensor comprising at least one positioning coil and a control circuit for controlling the respective positioning coil. Advantageously, the respective positioning coil can be configured as a transmitting coil for generating a magnetic positioning field.

[0023] For example, the respective control circuit can comprise at least one capacitor array, one damping element, one filter, and one switching element as electronic components. The capacitor array serves to form a resonant circuit with the positioning coil. The capacitor array includes at least one capacitor. A preferred embodiment is one in which the capacitor array comprises two capacitors connected in parallel. At least the capacitor array is then arranged on the positioning coil carrier, while at least the switching element is arranged on the circuit carrier. For the purpose of creating variants, it can be advantageous to arrange as many components as possible on the circuit carrier, which can then be configured identically for all variants.In contrast, adapting the resonant circuit to the boundary conditions of each variant, as required for variant development, can be carried out more cost-effectively if the capacitor assembly is located on the positioning coil carrier. Optionally, the damping element and / or the filter can also be located on the positioning coil carrier.

[0024] In these embodiments with control lines passing through the support structure, it is generally conceivable that the control lines are routed around components of the support structure on the outside, within a circumference of the support structure. Alternatively, it is equally conceivable that channels are formed in components of the support structure through which the control lines are routed. Such channels can be open laterally, like a groove, or closed laterally, like a bore.

[0025] In another embodiment, the inductive charging device may have a longitudinal direction transverse to the vertical direction and a longitudinal centerline running parallel to the longitudinal direction, with the supports arranged such that the respective support gap, in which the respective positioning coil is arranged, is oriented substantially centrally to the longitudinal centerline. In other words, the longitudinal centerline extends centrally through the respective support gap. In particular, the longitudinal centerline thus extends substantially centrally through the respective positioning coil. This simplifies finding the optimal positioning between the stationary inductive charging device and the mobile inductive charging device when using the vehicle charging system.

[0026] In another embodiment, the inductive charging device may have at least two such positioning coils arranged diametrically opposite each other with respect to a central axis of the inductive charging device running parallel to the vertical direction. If a position sensor of the type described above is used, it may have these two diametrically opposite positioning coils. Likewise, the use of two such position sensors, each with one positioning coil, is conceivable, as they are then positioned diametrically opposite each other. The geometric center of the two positioning coils then corresponds to the position of the central axis, which simplifies finding the optimal positioning between the inductive charging devices when using the inductive vehicle charging system.

[0027] A battery-electric vehicle according to the invention comprises at least one battery, a charging control unit coupled to the battery for charging the battery, and a mobile inductive charging device of the type described above, which is coupled to the charging control unit. Advantageously, the support structure of the mobile inductive charging device is attached to the vehicle floor, in particular to the underbody.

[0028] An inductive vehicle charging system according to the invention, which serves to charge the battery of a battery-electric vehicle, is equipped with a mobile inductive charging device of the type described above, which is designed for attachment to a vehicle. Furthermore, the inductive vehicle charging system is equipped with a stationary inductive charging device, which is designed for attachment to a vehicle parking space. The stationary inductive charging device has at least one induction coil for generating an alternating magnetic or electromagnetic field and a position detection device for detecting the respective position field. The position detection device may, in particular, be a foreign object sensor.

[0029] Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated description of the figures based on the drawings.

[0030] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention. Components of a higher-level unit, such as a device, apparatus, or arrangement, mentioned above and those to be mentioned below, which are designated separately, can form separate parts or components of this unit or be integral areas or sections of this unit, even if this is depicted differently in the drawings.

[0031] Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components. They show, schematically, Fig. 1 A highly simplified view from below of a mobile inductive charging device with two positioning coils in the area of ​​an induction coil, Fig. 2 a view as in Fig. 1, however, with the induction coil omitted and with two positioning coils in another embodiment, Fig. 3 a sectional view of the induction charging device in the area of ​​a positioning coil made of Fig. 1, Fig. 4 a sectional view of the induction charging device in the area of ​​a positioning coil made of Fig. 2, Fig. 5 a highly simplified circuit diagram of a control circuit for the positioning coil, Fig. 6 an enlarged detail VI from Fig. 2 in the area of ​​one of the positioning coils.

[0032] According to the Fig. 1 and Fig. 2 has a mobile induction charging device 1 with at least one induction coil 2, which for simplification is in Fig. 2 is omitted. The induction coil 2 of the mobile induction charging device 1 serves to receive a magnetic or electromagnetic alternating field and extends in a coil plane 3, which is located in the Fig. 3 and Fig. 4 is indicated by a dashed line. The coil plane 3 extends into the Fig. 1 and Fig. 2 parallel to the drawing plane and runs perpendicular to a height direction Z, which is in the Fig. 1, Fig. 2 and Fig. 6 is perpendicular to the drawing plane. The induction charging device 1 also defines a longitudinal direction X and a transverse direction Y, which extends perpendicular to the longitudinal direction X. The vertical direction Z runs perpendicular to the longitudinal direction X and perpendicular to the transverse direction Y. A circumferential direction U runs around the vertical direction Z and is in the Fig. 1, Fig. 2 and Fig. 6 each indicated by a double arrow.

[0033] Furthermore, the mobile inductive charging device 1 has a support structure 4 which serves to attach the inductive charging device 1 to a vehicle 5, which is in the Fig. 3 and Fig. 4 is indicated by a broken line. The supporting structure 4 has several beams 6 that extend within a load-bearing area 7, which is located in the Fig. 3 and Fig. 4 is indicated by a curly bracket and runs parallel to the coil plane 3.

[0034] Furthermore, the mobile induction charging device 1 is equipped with several plate-shaped magnetic field conductors 8. These magnetic field conductors 8 can be configured in a planar configuration and extend parallel to the coil plane 3. The magnetic field conductors 8 are also arranged above the induction coil 2.

[0035] According to the Fig. 1 and Fig. 2 and according to Fig. In the support area 7, two of these supports 6 are adjacent to each other in the circumferential direction U, run inclined to each other, and form a gap 9 between them. The magnetic field conductors 8 are each arranged in the area of ​​such a gap 9 on the support structure 4. These magnetic field conductors 8 can each be inserted appropriately into such a gap 9. It is also conceivable that the magnetic field conductors 8 are supported on the supports 6 in the vertical direction Z.

[0036] The induction charging device 1 shown here is also equipped with at least one position sensor 10. In the Fig. 1 and Fig. In the preferred embodiments shown in Figure 2, the induction charging device 1 has two such position sensors 10, which are arranged diametrically opposite each other with respect to a central axis 11 of the induction charging device 1. The central axis 11 runs parallel to the vertical axis Z and can, in particular, be located in the center of the support structure 4 and / or in the center of the induction coil 2. Fig. 1 and Fig. 2 The central axis 11 is perpendicular to the drawing plane.

[0037] Each position encoder 10 has at least one positioning coil 12 for generating a magnetic or electromagnetic position field and a control circuit 13 for controlling the respective positioning coil 12. The respective positioning coil 12 is located in the Fig. 1 and Fig. 2 and 6 are each symbolized by a closed ring. The control circuit 13 is located in the Fig. 3 and Fig. 4 indicated. Fig. Figure 5 shows a circuit diagram for such a control circuit 13. The respective positioning coil 12 is preferably arranged in the vertical direction Z between such a magnetic field conductor 8 and the induction coil 2. Alternatively, the respective positioning coil 12 can also be arranged below the induction coil 2. Furthermore, the respective positioning coil 12 is arranged completely within such a support space 9. In this respect, the respective positioning coil 12 is spaced laterally from the support structure 4 within the respective support space 9 in the vertical direction Z. In the case of the Fig. 3 and Fig. In the arrangement of the respective positioning coil 12 shown in the vertical direction Z between the respective magnetic field conductor 8 and the induction coil 2, it can in particular be provided that the positioning of the respective positioning coil 12 is chosen such that at no point is there an overlap in the vertical direction Z of the positioning coil 12 by a component of the supporting structure 2, in particular by a support 6.

[0038] According to the Fig. 1 and Fig. In both 2 and 6, the support structure 4 can have an inner frame 14, which in the examples shown is ring-shaped and connects all the supports 6 in the circumferential direction U. Furthermore, the inner frame 14 radially defines the spaces between the supports 9 inwards. In addition, the support structure 4 can have an outer frame 15, which in the examples shown is ring-shaped and connects all the supports 6 in the circumferential direction U. The outer frame 15 now radially defines the spaces between the supports 9 outwards. The respective positioning coil 12 is also visibly spaced laterally from the inner frame 14 and the outer frame 15. Preferably, the respective positioning coil 12 is also not covered in the vertical direction Z by the inner frame 14 or by the outer frame 15.In particular, the supporting structure 4 can be configured such that the spaces between the beams 9 are open in the vertical direction Z, i.e., they are not covered by a component of the supporting structure 4 in the vertical direction Z.

[0039] Furthermore, each positioning coil 12 has a contour 16 extending transversely or laterally to the vertical direction Z, which forms the ring of the positioning coil 12. The contour 16 can and expediently be adapted to a circumferential contour 17 of the associated support space 9, wherein this circumferential contour 17 is defined or limited by the support structure 4 transversely or laterally to the vertical direction Z. In the examples of Fig. 1 and Fig. In both 2 and 6, the circumferential contour 17 of the respective carrier spaces 9 is essentially trapezoidal. Correspondingly, the contour 16 of the respective positioning coil 12 in the examples is also trapezoidal. Furthermore, the Fig. 1 and Fig. From figures 2 and 6, it can be seen that the respective positioning coil 12 has two coil sections 18, each extending parallel to one of the two supports 6 that define the respective support space 9 in which the respective positioning coil 12 is arranged. Fig. 2 and Fig. 6 also shows that another inner coil section 19 runs parallel to the inner frame 14, while another outer coil section 20 runs parallel to the outer frame 15.

[0040] How in particular the Fig. 1 to 4 and 6, the respective positioning coil 12 can be formed on a positioning coil carrier 21, which is arranged in the respective carrier space 9. The positioning coil 12 can be printed onto the positioning coil carrier 21. The positioning coil carrier 21 is flat and can extend perpendicular to the vertical direction Z. Furthermore, the positioning coil carrier 21 can be made of circuit board material. In the case of the Fig. 1 and Fig. In the embodiment shown in 3, the positioning coil carrier 21 is designed as a plate or as a solid surface. In contrast, the Fig. 2 and Fig. 4 and 6 an embodiment in which the positioning coil carrier 21 is designed in an annular shape, so that it has a central through-opening 22 around which the positioning coil 12 revolves.

[0041] According to Fig. 4 can now be provided that the induction coil 2 or one in the Fig. 3 and Fig. 4 Induction coil carrier 23 shown, in which the induction coil 2 is embedded, is bonded or potted to the respective magnetic field conductor 8 through the respective through-opening 22. A corresponding adhesive bond or potting is shown in Fig. 4 indicated and labelled 24. The induction coil 2 is wound with a coil wire, which can be designed in particular as a stranded wire.

[0042] In the Fig. Control lines 25 are also indicated at points 1 to 4 and 6, which serve to control the respective positioning coil 12. These control lines 25 can now be connected according to the Fig. 3 and Fig. 4 from the respective positioning coil 12 through the support structure 4 to an area 26 that lies above the magnetic field conductors 8 and that is in the Fig. 3 and Fig. 4 is indicated by a curly bracket. In Fig. Figure 1 shows how the control lines 25 run, at least in sections, within a component of the supporting structure 4, namely in the outer frame 15. In the Fig. 2 and Fig. Figure 6, on the other hand, shows how the control lines 25 run, at least in sections, within the supports 6. In the Fig. 3 and Fig. Figure 4 shows how the control lines 25 are routed through a support 6.

[0043] According to Fig. The control circuit 13 can have several components 27, which, purely by way of example and without loss of generality, can be a capacitor arrangement 28, a damper 29, a filter 30, and a switching element 31. The capacitor arrangement 28 can function with a single capacitor C. However, the example shows a preferred variant with two capacitors C connected in parallel. The capacitor arrangement 28 forms an electrical resonant circuit with the positioning coil 12. The damper 29 can, for example, be formed by an ohmic resistor R. The filter 30 can be formed by an inductor L, a capacitor C, and an ohmic resistor R. The switching element 31 can be formed by a transistor T. Advantageously, at least one of these components 27 can be arranged on the positioning coil carrier 21.For example, at least the capacitor assembly 28 is arranged on the positioning coil carrier 21. At least one other of these components 27, however, is arranged on a circuit carrier 32, which is arranged according to the . Fig. 3 and Fig. 4 is located above the magnetic field conductors 8, specifically in the aforementioned area 26 above the magnetic field conductors 8. For example, at least the switching element 31 is arranged on this circuit carrier 32. For cost-effective variant design, it may also be advantageous to mount the damping element 29 on the positioning coil carrier 21. For improved EMC, it may be advantageous to mount the filter 30 on the positioning coil carrier 21, where EMC stands for electromagnetic compatibility.

[0044] In the Fig. 3 and Fig. Figure 4 also shows a cooling plate 33, which is intended to dissipate heat from the induction charging device 1. It is clear that, for this purpose, the magnetic field conductors 8, for example, transfer heat and are connected to this cooling plate 33, e.g., by bonding or by potting with a material or substance with increased thermal conductivity, as described above for bonding 24 and potting 24, respectively.

[0045] In the example of the Fig. 1 and Fig. In the induction charging device 1, as shown in sections 2 and 6, the device has a longitudinal centerline 34 running parallel to the longitudinal direction X. Advantageously, the supports 6 within the support structure 4 are positioned or arranged such that the support space 9 provided for accommodating the respective positioning coil 12 is essentially centered with respect to this longitudinal centerline 34. Consequently, the respective positioning coil 12 can also be aligned essentially centered with respect to the longitudinal centerline 34 within this support space 9. When using two positioning coils 12 that are diametrically opposed to each other with respect to the central axis 11, the arrangement of the two positioning coils 12 can also be such that the central axis 11 is located at the geometric center of the two positioning coils 12.

[0046] The mobile inductive charging device 1 presented here is in accordance with the Fig. 1 and Fig.2 expediently a component of an otherwise not shown inductive vehicle charging system 35, which as a further important component has a stationary inductive charging device configured complementarily to the mobile inductive charging device 1 in order to effect inductive energy transfer. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 212 277 A1

[0003]

Claims

[1] Mobile induction charging device (1) for an inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), - with at least one induction coil (2) for receiving an alternating magnetic field, which extends in a coil plane (3) running perpendicular to the height direction (Z) of the induction charging device (1), - with a support structure (4) for fastening the induction charging device (1) to a vehicle (5), which has a plurality of supports (6) extending in a support area (7) running parallel to the coil plane (3), - with several plate-shaped magnetic field conductors (8), each extending above the induction coil (2) parallel to the coil plane (3), - wherein at least two of these supports (6) are adjacent in the support area (7) in the circumferential direction (U), are inclined to one another and form a support space (9) between them in the support area (7), - wherein one of the magnetic field conductors (8) is arranged in the region of the respective carrier gap (9), characterized by , - that the induction charging device (1) has at least one positioning coil (12) for transmitting and / or receiving a magnetic position field, - that the respective positioning coil (12) is arranged below such a magnetic field conductor (8) and above or below the induction coil (2), - that the respective positioning coil (12) is arranged completely within such a carrier gap (9). [2] Induction charging device (1) according to claim 1, characterized by , - that the respective positioning coil (12) is arranged in the height direction (Z) between such a magnetic field conductor (8) and the induction coil (2). [3] Induction charging device (1) according to claim 1 or 2, characterized by , - that the respective positioning coil (12) is arranged completely within the support structure (4) in the height direction (Z). [4] Induction charging device (1) according to one of the preceding claims, characterized by , - that the support structure (4) has an inner frame (14) which connects two or more or all supports (6) radially inwardly with respect to a central axis (11) of the induction charging device (1) running parallel to the height direction (Z), - that the respective carrier gap (9) is radially limited on the inside by the inner frame (14). [5] Induction charging device (1) according to one of the preceding claims, characterized by , - that the support structure (4) has an outer frame (15) which connects two or more or all supports (6) radially outwardly with respect to a central axis (11) of the induction charging device (1) running parallel to the height direction (Z), - that the respective carrier gap (9) is radially limited on the outside by the outer frame (15). [6] Induction charging device (1) according to one of the preceding claims, characterized by , - that the respective positioning coil (12) has a contour (16) laterally or perpendicularly to the height direction (Z) which is geometrically adapted to a circumferential contour (17) of the respective carrier intermediate space (9) delimited by the support structure (4) laterally or perpendicularly to the height direction (Z). [7] Induction charging device (1) according to one of the preceding claims, characterized by , - that the respective positioning coil (12) has two coil sections (18) which extend parallel to one of the two supports (6) each, which delimit the respective support space (9) in which the respective positioning coil (12) is arranged. [8] Induction charging device (1) according to one of the preceding claims, characterized by , - that the respective positioning coil (12) is formed on a positioning coil carrier (21) which is arranged in the respective carrier intermediate space (9). [9] Induction charging device (1) according to claim 8, characterized by , - that the respective positioning coil carrier (21) has a central through-opening (22). [10] Induction charging device (1) according to claim 9, characterized by , - that the induction coil (2) or an induction coil carrier (23) carrying the induction coil (2) is glued or cast with the respective magnetic field conductor (8) through the through-opening (22). [11] Induction charging device (1) according to one of the preceding claims, characterized by , - that control lines (25) for controlling the respective positioning coil (12) are guided through the support structure (4) to an area (26) located above the magnetic field conductors (8). [12] Induction charging device (1) according to one of the preceding claims, characterized by , - that the induction charging device (1) has at least one position sensor (10) which has the at least one positioning coil (12) and a control circuit (13) for controlling the respective positioning coil (12), - that the respective positioning coil (12) is designed as a transmitting coil for generating a magnetic positioning field. [13] Induction charging device (1) according to claim 12, characterized by , - that the respective control circuit (13) has several electronic components (27), - that at least one component (27) is arranged on a positioning coil carrier (21) which carries the respective positioning coil (12), - that at least one other component (27) is arranged on a circuit carrier (32) which is arranged in a region (26) lying above the magnetic field conductors (8), - that control lines (25) lead from the positioning coil carrier (21) through the support structure (4) to the circuit carrier (32). [14] Induction charging device according to claim 13, characterized by , - that the respective control circuit (13) has at least one capacitor arrangement (28), an attenuator (29), a filter (30) and a switching element (31) as electronic components (27), - that at least the capacitor arrangement (28) is arranged on the positioning coil carrier (21), - that at least the switching element (31) is arranged on the circuit carrier (32). [15] Induction charging device (1) according to one of the preceding claims, characterized by , - that the induction charging device (1) has a longitudinal direction (X) transverse to the height direction (Z) and a longitudinal center line (34) running parallel to the longitudinal direction (X), - that the supports (6) are arranged such that the respective support space (9) in which the respective positioning coil (12) is arranged is aligned substantially centrally to the longitudinal center line (34). [16] Induction charging device (1) according to one of the preceding claims, characterized by , - that the induction charging device (1) has at least two such positioning coils (12) which are arranged diametrically opposite one another with respect to a central axis (11) running parallel to the height direction (Z). [17] Battery electric vehicle (5), - with a battery, - with a charging control unit coupled to the battery, - with a mobile induction charging device (1) according to one of the preceding claims, which is coupled to the charging control device. [18] Inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), - with a mobile induction charging device (1) according to one of claims 1 to 16 for attachment to a vehicle (5), - with a stationary induction charging device for attachment to a vehicle parking space, which has at least one induction coil for generating an alternating magnetic field and a position detection device for detecting the respective position field.

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