Stationary inductive charging equipment

Abstract

The present invention relates to a stationary inductive charging device (1), comprising a coil (2) for generating an alternating electromagnetic field, power electronics (3) for supplying energy to and driving the coil (2), the stationary inductive charging device (1) comprising at least one housing (8), the at least one housing (8) including a housing interior (9) in which at least the coil (2) is arranged, the at least one housing (8) having a bottom plate (10), a cover (12) spaced apart from the bottom plate (10) in a housing height direction (Z), and a frame (13) connecting the bottom plate (10) to the cover (12), the frame (13) surrounding the housing interior (9) in a housing circumferential direction (U). Efficient cooling of the coil (2) can be achieved using an air passage system (15) heat-transferably connected to the bottom plate (10) and having at least one air passage (20) for guiding air, at least one blower (16) for driving air in the air passage system (15), at least one air inlet (18) communicating with the surroundings (17) of the inductive charging device (1), and a ventilation device (14) having at least one air outlet (19) communicating with the surroundings (17).

Description

[Technical Field]

[0001] The present invention relates to a stationary inductive charging device for use in an inductive vehicle charging system preferably used to charge the batteries of a battery electric vehicle. The present invention further relates to an inductive vehicle charging system equipped with such a stationary inductive charging device.

[0002] Such a vehicle charging system includes a stationary inductive charging device and a mobile inductive charging device. The stationary inductive charging device, which may also be called a ground assembly, is generally fixed, for example, in a parking lot, and connected to a power supply system. The mobile inductive charging device, which may also be called a vehicle assembly, is arranged on each vehicle, particularly on the vehicle floor. The mobile inductive charging device is coupled to the vehicle's battery in a suitable manner, for example, via a corresponding vehicle-side charging device. For battery charging, the vehicle is positioned with its mobile inductive charging device relative to the stationary inductive charging device so that electrical energy can be transferred from the stationary inductive charging device to the mobile inductive charging device by induction, i.e., via an alternating electromagnetic field. In the case of a bidirectional vehicle charging system, it is also possible to transfer electrical energy from the mobile inductive charging device to the stationary inductive charging device. In the case of an inductive vehicle charging system, a plug that must be inserted into a vehicle-side charging socket can be omitted.

[0003] The stationary inductive charging device has a coil for generating an alternating electromagnetic field, which may also be referred to as a resonator coil, and power electronics for supplying energy to and driving the coil. During operation of the stationary inductive charging device, heat is generated in the active components of the power electronics and in the coil. In this case, a relatively large amount of heat is generated at high power outputs, and this heat must be dissipated to avoid damage to or extend the life of the power electronics and the coil.

[0004] To cool the power electronics and coils, a cooling circuit can be used, which basically has a first heat exchanger for absorbing heat inside the stationary inductive charging device and a second heat exchanger for discharging heat to the environment outside the stationary inductive charging device. In this case, a liquid refrigerant is preferably used to increase the cooling power. However, the cost of incorporating such a closed liquid circuit into a stationary inductive charging device is relatively high. Furthermore, such a cooling circuit generates annoying noise.

[0005] A further approach for cooling power electronics and coils is known as airflow, in which cool ambient air is drawn in and guided through the housing of the resonator coil or power electronics. In this approach, contaminated ambient air is therefore guided into or through structural spaces containing components with large potential differences, which significantly increases the risk of electrical flashovers between these components and thus the risk of malfunction.

[0006] The problem addressed by the present invention is to provide an improved embodiment, or at least one alternative embodiment, of a stationary inductive charging device of the type described above, which is particularly advantageous in terms of efficient heat dissipation while at the same time having relatively low manufacturing costs.

[0007] The above object is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

[0008] The present invention is based on the general idea of ​​equipping a stationary inductive charging device with a ventilation device having an air duct system for guiding air and at least one fan for driving the air in the air duct system. The air duct system in this case has at least one air duct for guiding air, which is heat-transferably connected to a bottom plate of the housing of the stationary inductive charging device. Air can be drawn into the air duct system from the surroundings via at least one air inlet and discharged back to the surroundings via at least one air outlet. While the cooling circuits are closed systems in which the respective refrigerants circulate, the ventilation device used here forms an open system and can therefore be implemented with significantly less effort than closed systems. Furthermore, using air from the surroundings for heat removal results in a significantly simplified structure compared to cooling circuits operating with liquid refrigerants. In particular, complex sealing is not required. Possible leaks may reduce the cooling efficiency but otherwise have no adverse effect on the inductive charging device or the surroundings. Furthermore, it has been found that such ventilation devices have sufficient cooling power while generating less noise than cooling circuits. A further advantage of the proposed solution is that air exchange between the generally polluted surrounding environment and the clean, generally dust-free interior of the housing is avoided, which leads to an increased service life.

[0009] Specifically, the present invention proposes a stationary inductive charging device having at least one housing that encloses or includes an interior housing chamber in which at least a coil is arranged. The housing further has a bottom plate, a cover spaced apart from the bottom plate in the housing height direction, and a frame connecting the bottom plate to the cover, the frame surrounding the interior housing chamber in the housing circumferential direction. The interior housing chamber is defined downwardly by the bottom plate, upwardly by the cover, and laterally by the frame. The frame can completely or at least partially surround the interior housing chamber in the housing circumferential direction. The ventilation device includes an air passage system for guiding air, heat-transferably connected to the bottom plate, having at least one air passage for guiding air, at least one fan for driving air in the air passage system, at least one air inlet communicating with the periphery of the inductive charging device, and at least one air outlet communicating with the periphery.

[0010] In the inductive charging device according to the present invention, a cooling circuit, which is a closed system operating with a liquid refrigerant, is omitted. Active cooling of the inductive charging device is carried out exclusively by air, and therefore the inductive charging device according to the present invention may also be referred to as an inductive charging device that is actively cooled exclusively by air. In this case, it is clear that the inductive charging device can also be passively cooled, i.e., by heat transfer to the floor on which the housing with the bottom plate rests, for example via the bottom plate, and / or by heat radiation, for example from the cover, to the surroundings of the inductive charging device.

[0011] Preferably, in this case it may be provided that electrically active components arranged in the housing interior which generate heat during their operation are thermally connected to the bottom plate in a suitable manner, for example a magnetic field conductor which is thermally connected to the coil and / or which generates heat during operation of the coil can be thermally connected to the bottom plate.

[0012] According to an advantageous embodiment, the bottom plate can be solid, i.e., not hollow, and not a body with a cavity. The bottom plate is preferably made of metal, in particular aluminum or an aluminum alloy. The bottom plate is preferably solid, i.e., has a significant wall thickness of a few millimeters, i.e., at least 2 mm. In particular, the wall thickness of the bottom plate is in the range of 2 to 20 mm.

[0013] Optionally, heat exchanger structures, such as ribs or thin plates, can be arranged within the air passages and are thermally connected to the bottom plate, thereby improving heat transfer between the bottom plate and the air.

[0014] According to another embodiment, each air channel can be formed in a channel body that is a separate component from the bottom plate. This allows for a particularly simple installation of each air channel, i.e., by assembling the respective channel body to the bottom plate. In this case, the channel body can be configured, in particular, as a heat exchanger. For example, the channel body can be manufactured for this purpose from metal, preferably from aluminum or an aluminum alloy. Optionally, the channel body can have at least one rib in its interior to improve heat transfer between the channel body and the air, around which the air flows.

[0015] In one embodiment, each channel body may be configured to define a respective air passage only laterally and upwardly, while each air passage is defined downwardly by a bottom plate to which the respective channel body is attached, resulting in the channel body having an open cross section.

[0016] In the context of this specification, "configuration" is synonymous with "configuration," and therefore the expression "configured to" is synonymous with "configured to."

[0017] Alternatively, each channel body can be configured with a channel bottom that defines the respective air channel downwards and is a separate component from the bottom plate and is connected to the bottom plate in a heat-transferring manner, in which case each channel body has a closed cross section. It has been found that a channel body with a closed cross section improves the heat transfer between the bottom plate and the air.

[0018] In another embodiment, the frame body can be hollow and can form a cavity surrounding the housing interior. At least one air channel of the air channel system can be formed or arranged in this cavity of the frame body. The cavity can completely or at least partially surround the housing interior in the housing circumferential direction within the frame body. By incorporating the respective air channels into the frame body, the construction space that is already available in the hollow frame body outside the housing interior can be fully utilized for cooling, which can further ensure a compact construction for the inductive charging device.

[0019] If the above-mentioned passage bodies are used, they are arranged in the hollow chambers of the frame body, but if the passage bodies are omitted, the respective air passages are formed by the hollow chambers of the frame body.

[0020] The housing interior is used to accommodate active components of the inductive charging device, i.e., in particular the coil. The frame is used to stabilize the housing and can have a wedge-shaped or beveled cross section, in particular transverse to the circumferential direction, to facilitate the vehicle's driving onto the stationary inductive charging device. This is particularly true for stationary inductive charging devices that are arranged on a floor surface and protrude from the floor surface in the housing height direction. This is particularly true for inductive charging devices that are retrofitted to the floor surface.

[0021] Preferably, the respective air inlet and the respective air outlet can be formed in the frame body, where again the frame body, which is already present in any case, is utilized to realize the openings for the air inlet and the air outlet.

[0022] In an advantageous embodiment, the frame can have an air exchange area that protrudes outward transversely to the housing height and thus away from the housing interior, and the air exchange area has at least one air inlet and / or at least one air outlet. By accommodating the air inlet or air outlet in this air exchange area, it is possible to select an orientation different from that specified by the frame outside the air exchange area, particularly for the respective air inlet or air outlet. For example, the frame can extend parallel to the housing longitudinal direction on one side of the housing. In that case, the respective air inlet or air outlet is necessarily oriented transversely to the housing longitudinal direction, i.e., in the housing transverse direction. In the air exchange area, the air inlet or air outlet can be oriented inclined with respect to the housing longitudinal direction and inclined with respect to the housing transverse direction, for example, at an inclination angle of 30° to 60°, preferably 45°. This can prevent air from short-circuiting to the surroundings, in particular by re-inhaling heated air at the respective air outlet.

[0023] According to an advantageous embodiment, each fan may be arranged in the air exchange area. More construction space is preferably available in the air exchange area than in the frame, allowing the use of relatively large fans. Larger fans operate at lower rotational speeds than smaller fans with the same pumping power, resulting in reduced noise emissions. Additionally or alternatively, a cable passage may be provided through the air exchange area. Such a cable passage connects the housing interior to the surroundings and allows for the routing of electrical cables for supplying current to the active components of the inductive charging device, i.e., at least the coil, arranged within the housing interior. Depending on the design of the inductive charging device, the power electronics may also be arranged within the housing interior. It is also conceivable for the power electronics to be arranged outside the housing containing the coil, for example, in a separate housing, in which case the power electronics would be connected to the coil via corresponding electrical cables. These electrical cables may also be provided through the cable passage.

[0024] In another advantageous embodiment, two separate air channels can be arranged in the hollow space of the frame, which run along the frame in opposite directions around the housing interior and connect their respective air inlets to their respective air outlets. Preferably, each of these air channels can then be associated with at least one fan for driving the air. The respective fan can then be arranged in the corresponding air channel or in the aforementioned air exchange area.

[0025] According to one development, it may be provided that the frame is formed with two separate air inlets and two separate air outlets, where one air passage connects one air inlet to one air outlet, while the other air passage connects the other air inlet to the other air outlet. Preferably, each air passage can extend over approximately half the circumference of the housing, over approximately 180°, so that the air inlet and the air outlet of each air passage are located on opposite sides of the housing.

[0026] In an alternative construction, it may be envisaged that the frame is formed with one common air inlet and two separate air outlets, with one air passage connecting the common air inlet to one air outlet, while the other air passage connecting the common air inlet to the other air outlet. Alternatively, it may be envisaged that the frame is formed with two separate air inlets and one common air outlet, with one air passage connecting one air inlet to the common air outlet, while the other air passage connecting the other air inlet to the common air outlet. A common air inlet or air outlet can result in a simplified construction. Here too, it may be envisaged that the respective air inlets and the respective air outlets are preferably arranged on opposite sides of the housing.

[0027] In other words, the respective air inlets and the respective air outlets are arranged on different housing sides that are spaced apart in a direction transverse to the height of the housing. The housing sides on which the respective air inlets and the respective air outlets are located may also be spaced apart in the longitudinal direction of the housing or in the transverse direction of the housing.

[0028] In another embodiment, the air inlet and the air outlet may be located on the same side of the housing, preferably adjacent to each other. In this case, only one air passage is arranged in the hollow space of the frame, and the air passage surrounds the housing interior along the frame and connects the air inlet to the air outlet. The air passage thus extends substantially around the entire circumference of the housing, i.e., substantially over approximately 360°. The use of only one air passage in the frame can be achieved by using only one fan, which has cost advantages.

[0029] Particularly advantageous is an embodiment in which the inductive charging device is configured as a double-housing installation, thus having two separate housings: a first housing or coil housing and a second housing or coil housing. The coil is arranged within the housing interior of the first housing or coil housing. In contrast, the power electronics are arranged completely or at least partially within the second housing or electronics housing. The two housings are spaced apart from each other. Preferably, the first housing or coil housing is located on the floor of the parking lot, while the second housing or electronics housing is located on a wall adjacent to the parking lot. In particular, in the case of such a double-housing installation, it is sufficient for the air passage system to extend exclusively within the frame to cool the coil. Advantageously, in this case, there is no need to provide space for the air passage within the housing interior, since the air guidance is performed exclusively within the frame, i.e., outside the housing interior.

[0030] In other embodiments, the inductive charging device may be configured as a single-housing installation, such that the inductive charging device has only one housing, in which case the coil and power electronics are located within the housing interior of the housing that thereby forms a common housing.

[0031] Since heat from the power electronics must also be dissipated during operation of the inductive charging device, it can be provided in an advantageous embodiment that at least one air duct of the air duct system is guided through the interior of the housing, which, although it does increase the constructional effort for the housing, avoids the need for two separate housings.

[0032] In this case, an embodiment in which the air ducts of the air duct system are arranged in the hollow space of the frame body and form air inlet ducts connected to the respective air inlets is particularly advantageous. Meanwhile, further or other air ducts of the air duct system, also arranged in the hollow space of the frame body, form air outlet ducts connected to the respective air outlets. Here, the further air ducts of the air duct system are arranged in the housing interior and form a connecting duct connecting the air inlet duct to the air outlet duct. This connecting duct is thus connected to the frame body to form a connection that communicates with the inlet duct and the outlet duct. Preferably, the respective blowers can be arranged in the connecting duct.

[0033] An embodiment in which the bottom plate projects outward beyond the frame in a direction transverse to the housing height, i.e., away from the housing interior, thereby forming a heat radiation surface that at least partially surrounds the frame in the housing circumferential direction is particularly advantageous. When assembled as envisioned for the inductive charging device presented herein, the bottom plate rests on the floor surface, and the heat radiation surface is therefore exposed to the surroundings. Heat generated in the housing reaches the bottom plate and can be released from the bottom plate to the air via the air passages, on the one hand, and to the surroundings via the heat radiation surface, on the other hand.

[0034] An inductive vehicle charging system according to the present invention, used to charge the batteries of battery electric vehicles, includes a stationary inductive charging device of the type described above, and further includes a mobile inductive charging device located on each vehicle.

[0035] Further important features and advantages of the invention are evident from the dependent claims, the drawings and the corresponding description of the drawings based on the drawings.

[0036] It is obvious that the features mentioned above and those to be further described below can be used not only in the respective described combinations but also in other combinations or alone, without departing from the scope of the invention as defined by the claims. The features mentioned above and those to be further described below which are described separately of a higher-level unit, such as a device, apparatus or installation, may form separate parts or components of this unit or may be an integrated region or division of this unit, even if shown differently in the drawings.

[0037] Preferred embodiments of the invention are illustrated in the drawings and will be explained in more detail in the following description, wherein like reference numbers indicate the same, similar or functionally identical components. [Brief explanation of the drawings]

[0038] [Figure 1] 4 is a highly simplified cross-sectional view of the stationary inductive charging device according to section line I of FIG. 3. [Figure 2] 1, but in a cross-sectional view of another embodiment. [Figure 3] 2 is a plan sectional view of the inductive charging device corresponding to the line of sight III in FIG. 1; [Figure 4] 4 is a plan cross-sectional view similar to FIG. 3 but showing another embodiment. [Figure 5] 4 is a plan cross-sectional view similar to FIG. 3 but showing another embodiment. [Figure 6] 4 is a plan cross-sectional view similar to FIG. 3 but showing another embodiment. [Figure 7] 4 is a plan cross-sectional view similar to FIG. 3 but showing another embodiment. [Figure 8] 1 is a highly simplified cross-sectional view of an inductive charging device in the inlet region of the housing. [Figure 9] 9 is a cross-sectional view similar to FIG. 8 but taken at the outlet region of the housing in another embodiment. [Figure 10] 10 shows a schematic view of the inductive charging device in the region of the edge opening corresponding to the viewing direction X in FIGS. 8 and 9. FIG. [Figure 11] 10 is a highly simplified cross-sectional view of the inductive charging device in the inlet region corresponding to section line XI of FIG. 8.

[0039] According to Figures 1 to 7, the stationary inductive charging device 1 includes a coil 2 for generating an alternating electromagnetic field. The coil 2 can be seen in cross section in Figures 1 and 2 and is symbolically indicated by a spiral in Figures 3 and 7. Each coil 2 can have one or more coil bodies (not shown). The inductive charging device 1 further includes power electronics 3, which are indicated only in Figure 7 by multiple dash-dotted rectangles. In this case, the power electronics 3 can include, inter alia, an active rectifier 4, an active inverter 5, and a control device 6.

[0040] The stationary inductive charging device 1 forms one component of an inductive vehicle charging system 7, which further comprises at least one mobile inductive charging device (not shown) located in a vehicle. The vehicle charging system 7 is used to charge the batteries of a battery-electric vehicle.

[0041] The inductive charging device 1 has at least one housing 8, which includes a housing interior 9. At least the coil 2 is arranged in the housing interior 9. The housing 8 further has a bottom plate 10, which rests on a floor 11 of a parking lot (not shown) where the inductive charging device 1 is installed. In this case, the bottom plate 10 may be thermally coupled and / or glued to the floor 11.

[0042] The housing 8 defines a housing longitudinal direction X, a housing lateral direction Y, and a housing height direction Z, which extend perpendicularly to one another, with respect to its length, width, and height. The housing 8 further has a housing circumferential direction U that surrounds the housing height direction Z. The housing 8 is preferably flat, so that the height of the housing 8 is much smaller than the length and width of the housing 8. According to Figures 3 to 7, the housing 8 is preferably rectangular in shape, with the longer sides defining the housing longitudinal direction X, while the shorter sides defining the housing lateral direction Y.

[0043] The housing 8 further comprises a cover 12 spaced apart from the bottom plate 10 in the housing height direction Z. The housing 8 further comprises a frame 13 which surrounds the housing interior 10 in the housing circumferential direction U and in this case connects the bottom plate 10 to the cover 12. The connection between the bottom plate 10 and the cover 12 formed by the frame 13 in this case forms a pressure-stable support of the cover 12 on the bottom plate 10. In order to facilitate the vehicle's driving onto the housing 8, the frame 13 is here configured wedge-shaped or bevel-shaped in a direction transverse to the circumferential direction U.

[0044] The inductive charging device 1 is further equipped with a ventilation device 14, which includes an air passage system 15, at least one fan 16, at least one air inlet 18 communicating with the housing 8 or the periphery 17 of the inductive charging device 1, and at least one air outlet 19 communicating with the periphery 17. The air passage system 15 includes at least one air passage 20 for guiding air, which is heat-transferably connected to the bottom plate 10. Each fan 16 is used to drive air through the air passage system 15. In this case, an air flow 21 is generated during operation of the ventilation device 14, which is indicated by arrows in Figures 3 to 7.

[0045] The bottom plate 10 is preferably made of metal and may advantageously be constructed as a solid body, for example, the bottom plate 10 may be an aluminum plate with a wall thickness of 10 mm.

[0046] Preferably, each air passage 20 is formed in a passage body 22, which can only be seen in FIG. 1 and is a separate component from the bottom plate 10. Each passage body 22 is attached to the bottom plate 10 in a heat-transferring manner. For example, the passage body 22 may be made of metal and connected to the bottom plate 9 by a material bond, for example by gluing, soldering, or welding. It is also conceivable that each passage body 22 is screwed to the bottom plate 10. Preferably, a heat-conducting material, such as a heat-conducting paste, is arranged between the thermally conductive adhesive 22 and the bottom plate 10. In the example of FIG. 1, each passage body 22 has a passage bottom 23, which defines the air passage 20 downward and rests on the bottom plate 10. In the example shown here, a plurality of cooling ribs are arranged in the passage body 22, around which air flows.

[0047] In contrast to Figure 1, Figure 2 shows an embodiment in which no channel body 22 is used to form the respective air channel 20. In the air channel 20 shown on the left side of Figure 2, a number of ribs 24 are arranged, which are heat-transferably and in particular fixedly connected to the bottom plate 10. In the case of the air channel 20 shown on the right side of Figure 2, a lamella structure 25 can be seen, which is inserted into the air channel 20 and around which air can flow.

[0048] The frame 13 of the housing 8 is hollow, thereby forming a cavity 26 that surrounds the housing interior 9. At least one of the air passages 20 is formed or arranged in this cavity 26. As a result, these air passages 20 are located outside the housing interior 9. When the passage bodies 22 shown in FIG. 1 are used, these passage bodies 22 are arranged in the cavity 26 of the frame 13. However, when this passage body 22 is omitted according to FIG. 2, each air passage 20 is formed by the cavity 26 of the frame 13.

[0049] In all the embodiments shown here, each air inlet 18 and each air outlet 19 is formed in the frame 13, for example in the form of openings 27 that can be seen in Figures 8 to 10. By means of these openings 27, each air inlet 18 or each air outlet 19 forms a fluid connection between the periphery 17 and the respective air passage 20.

[0050] According to Figures 3 to 7, a cable passage 28 can be formed in the housing 8, through which a cable can be laid from the outside into the housing interior 9 in order to supply electrical energy to active components, such as the coil 2.

[0051] In order to improve support, a plurality of webs 29 can be formed in the hollow frame 13, which are spaced apart in the housing circumferential direction U and reinforce the cross section of the frame 13. According to FIG. 1, these webs 29 can be supported on the stable passage body 22.

[0052] In the examples of Figures 3, 4 and 7, the frame body 13 encloses a substantially constant cross section in the housing circumferential direction U. In contrast to this, Figures 5 and 6 show examples in which the frame body 13 has an air exchange area 30 which projects outward transversely to the housing height direction Z, i.e. away from the housing interior 9. Advantageously, this air exchange area 30 can be arranged in the area of ​​the cable channel 28, which is therefore guided through it.

[0053] 5, two fans 16 are arranged in this air exchange area 30. In this case, the fans 16 are arranged at respective air outlets 19. Here, both air outlets 19 are inclined at approximately 45° to the longitudinal direction X of the housing and in opposite directions to each other, so that the two air outlets 19 are inclined at approximately 90° to each other. The inclination of each air outlet 19 depends on the main flow direction of the air flow 21 present at this air outlet 19.

[0054] 6, an air inlet opening 18 and an air outlet opening 19 are arranged in the air exchange area 30, and the air inlet opening 18 and the air outlet opening 19 are also inclined at approximately 90° to each other. In this example, only one fan 16 is arranged in the air exchange area 30, and this fan 16 is preferably arranged at the air outlet 19.

[0055] In the example of Figures 3 to 5, two separate air passages 202 are arranged in the hollow chamber 26 of the frame 13, forming a first air passage 201 and a second air passage 202. Both air passages 20 surround the housing interior 9 in opposite directions along the frame 13. In the example of Figures 3 to 5, the first air passage 201 arranged on the left surrounds in a clockwise direction, while the second air passage 202 shown on the right surrounds in a counterclockwise direction. In this case, each air passage 20 connects a respective air inlet 18 to a respective air outlet 19. At least one blower 16 is arranged in each of the air passages 20.

[0056] 3, the frame 13 is formed with two separate air inlets 18 and two separate air outlets 19. One or first air duct 201 connects one or left-hand air inlet 18 to one or left-hand air outlet 19, while the other or second air duct 202 connects the other or right-hand air inlet 18 to the other or right-hand air outlet 19. At least one or exactly one fan 16 is respectively arranged in each of the two air ducts 20 between the corresponding air inlet 18 and the corresponding air outlet 19, for example in a duct region extending in the transverse direction Y of the housing.

[0057] In the example shown in Figures 4 and 5, the frame 13 is formed with one common air inlet 18 and two separate air outlets 19. One or first air passage 201 connects the common air inlet 18 to one or left-hand air outlet 19. The other or second air passage 202 connects the common air inlet 18 to the other or right-hand air outlet 19. In a variant not shown here, the frame 13 can have two separate air inlets 18 and one common air outlet 19, in which case one or first air passage 201 connects one or left-hand air inlet 18 to the common air outlet 19, while the other or second air passage 202 connects the other or right-hand air inlet 18 to the common air outlet 19. In the example of Fig. 4, at least or exactly two fans 16 are respectively associated with each of the two air ducts 20, and these fans 16 are arranged in the respective air ducts 20 between the corresponding air inlets 18 and the corresponding air outlets 19, for example at the transition or corner where a duct area extending in the housing transverse direction Y merges into a duct area extending in the housing longitudinal direction X. In contrast to this, in the example of Fig. 5, at least or exactly one fan 16 is respectively associated with each of the two air ducts 20, and this fan 16 is arranged at the corresponding air outlet 19, in particular in the air exchange area 30.

[0058] In the embodiment of FIGS. 3 to 5, the respective air inlets 18 and the respective air outlets 19 are arranged on different housing sides and are here spaced apart from one another in the lateral direction Y of the housing.

[0059] As can be seen by comparing Figures 4 and 5, by locating both air outlets 19 within the air exchange area 30, the respective air passages 20 extending within the frame 13 can be lengthened, thereby providing more surface area for heat transfer thereat.

[0060] In the example of Fig. 6, only one air inlet 18 and only one air outlet 19 are provided. In this case, the air inlet 18 and the air outlet 19 are located on the same housing side, more particularly, preferably adjacent to each other. If an air exchange area 30 is also provided as in Fig. 6, the air inlet 18 and the air outlet 19 are formed in this air exchange area 30, which allows more space to be used in the frame 13 for each air passage 20 and thus more surface area for heat transfer. In the example of Fig. 6, only one air passage 20 is arranged or formed in the hollow space 26 of the frame 13, which air passage 20 surrounds the housing interior 9 along the frame 13 and connects the air inlet 18 to the air outlet 19. In the example of Figures 3 to 5, both air passages 201 and 202 each encircle the housing interior chamber 9 by only about 180°, whereas the air passage 20 shown in Figure 6 encircles the housing interior chamber 9 by about 360°.

[0061] When the inductive charging device 1 is configured as a double-housing arrangement, the housing 8 shown in Figures 3 to 6 forms a first housing 81 or coil housing 81, which includes a housing interior 9 in which the coil 2 is arranged. In that case, the inductive charging device 1 configured as a double-housing arrangement further includes a second housing 82, which is symbolically indicated here only in Figure 3 by a rectangle and which may also be referred to as an electronics housing 82. The electronics housing 82 is arranged at a distance from the coil housing 81 and includes at least a part of the power electronics 3.

[0062] In contrast, if the inductive charging device 1 is configured as a single-housing installation, the inductive charging device 1 has only one housing 8, as shown in FIG. 7. In this case, in addition to the coil 2, the power electronics 3 are also arranged in the housing interior 9 of the housing 8. In the example of FIG. 7, an air channel 20 runs through the housing 8 or the housing interior 9. Preferably, the air channel 20 runs between the coil area 31, in which the coil 2 is arranged, and the electronics area 32, in which the power electronics 3 are accommodated. This thermally isolates the coil 2 and the power electronics 3 from each other. At the same time, heat can be directly removed from the housing interior 9 using the air channel 20. Heat can only be removed indirectly from the housing interior 9 via the air channel 20 extending into the frame 13, i.e., via the bottom plate 10.

[0063] In the example of FIG. 7 , the air passages 20 of the air passage system 15 are arranged in the hollow chambers 26 of the frame body 13 and form inlet passages 20E connected to the respective air inlets 18. In the embodiment shown in FIG. 7 , the air inlets 18 extend over approximately 180° around the frame body 13 in the housing circumferential direction U. Alternatively, multiple air inlets 18 may be arranged distributed over approximately 180° along the frame body 13. Preferably, the air inlet passages 20E extend over 180° along the frame body 13. Further air passages 20 of the air passage system 15 are arranged in the hollow chambers 26 of the frame body 13 and form outlet passages 20A connected to the respective air outlets 19. The air outlets 19 here extend over approximately 180° along the frame body 13 in the housing circumferential direction U. Alternatively, multiple air outlets 19 may be arranged distributed over approximately 180° along the frame body 13. The outlet passage 20A also extends over approximately 180° along the frame 13. The air passage 20 guided through the housing interior 9 forms a connecting passage 20V connecting the air inlet passage 20E to the air outlet passage 20A. Preferably, at least one blower 16 is arranged in the connecting passage 20V.

[0064] In the example shown in Fig. 7, at least two fans 16 are arranged in the connecting passage 20V, forming two fan stages, i.e., a first fan stage and a second fan stage, arranged one after the other or in series in the direction of air flow. In the example shown here, the first fan stage, located on the left side of Fig. 7, has exactly one fan 16, while the second fan stage, located on the right side of Fig. 7, has exactly two fans 16 operating in parallel with each other.

[0065] In the example of Fig. 1, the bottom plate 10 terminates with the frame body 13 in a direction transverse to the housing height direction Z. In this case, the frame body 13 can laterally grip the bottom plate 10 in the housing height direction Z or can support the bottom plate 10 in the housing height direction Z. In the example of Fig. 2, the bottom plate 10 protrudes outward beyond the frame body 13 in a direction transverse to the housing height direction Z and forms a heat radiation surface 33 in this region protruding beyond the frame body 13, which heat radiation surface 33 at least partially surrounds the frame body 13 in the housing circumferential direction U. Preferably, according to Fig. 5, the heat radiation surface 33 can surround the frame body 13 in a closed manner in the housing circumferential direction U.

[0066] Each air inlet 18 formed in the frame 13 can then form an inlet region 34, which will be described in more detail below with reference to Figures 8 to 11. Each air outlet 19 formed in the frame 13 can then form an outlet region 35, which will be described in more detail below with reference to Figures 8 to 11. The following embodiments for Figures 8 to 11 can be implemented in the same way in all of the above-described embodiments of Figures 1 to 7.

[0067] According to FIG. 8, at least one heat exchanger structure 36 can be arranged in the inlet region 34, heat-transferably connected to the bottom plate 10. For example, each heat exchanger structure 36 can be glued or soldered to the bottom plate 10. Each heat exchanger structure 36 guides air from an inlet opening 37, formed in this case by the opening 27, to a respective air passage 20. Additionally or alternatively, according to FIG. 9, at least one heat exchanger structure 38 can be arranged in the outlet region 35, heat-transferably connected to the bottom plate 10. Each heat exchanger structure 38 guides air from a respective air passage 20 to an outlet opening 39, formed in this case by the opening 27. Each heat exchanger structure 36, 38 can be formed in this case by a lamella 40 or a rib 40, or by another heat-transfer structure, according to FIG. 11.

[0068] In the embodiment shown in Fig. 8, the inlet opening 37 is connected to the air passage 20 via a connecting opening 41. In the embodiment shown in Fig. 9, a partition wall 42 is formed in the outlet region 35, which defines the air passage 20. The partition wall 42 increases the stability of the frame 13 and thus of the housing 8. A further connecting opening 43 forms a communicating connection between the air passage 20 and the outlet opening 39. It is clear that the outlet region 35 could also be configured identically to the inlet region 34 shown in Fig. 8. It is also conceivable that the inlet region 34 could be configured identically to the outlet region 35 shown in Fig. 9.

[0069] In all the above-described embodiments, an air filter 44, shown only in Fig. 8, can be arranged in each air passage 20, through which the air flow 21 flows. Preferably, each air filter 44 is located in the region of the respective air inlet 18. Purely by way of example, according to Fig. 8, such an air filter 44 can also be arranged in the inlet region 34 between the heat exchanger structure 36 and the respective air passage 20, i.e. directly at the inlet of the air passage 20 or in the inlet of the air passage 20.

[0070] 1 and 2, a plurality of plate-shaped magnetic field conductors 45 are arranged in the housing interior 9 between the coil 2 and the bottom plate 10. The magnetic field conductors 45 may be made of ferrite. They amplify the electromagnetic alternating field generated by the coil 2 in an upward direction with respect to its radiation. The coil 2 may be thermally connected to the magnetic field conductors 45. The magnetic field conductors 45 are supported on the bottom plate 10 via support legs 46. This allows high pressure loads on the cover 12, which may occur, for example, when the housing 8 is lifted, to be transferred to the bottom plate 10, which can then support the cover 12 on the floor 11. The support legs 46 are preferably made of metal and are configured, in particular, as heat conductors, and thus thermally connect the magnetic field conductors 45 to the bottom plate 10. This allows the heat of the coil 2 to be ultimately transferred via the magnetic field conductors 45 and the support legs 46 to the bottom plate 10. The bottom plate 10 itself is a heat conductor, so heat can be transferred from the bottom plate 10 to the air through the cooling passages 20, thereby achieving efficient heat removal and thus cooling of the coil 2.

Claims

1. A stationary inductive charging device (1), The stationary inductive charging device (1) comprises a coil (2) for generating an alternating electromagnetic field; The stationary inductive charging device (1) comprises power electronics (3) for supplying energy to and driving the coil (2), The stationary inductive charging device (1) comprises at least one housing (8), the at least one housing (8) including a housing interior (9) in which at least the coil (2) is arranged, the at least one housing (8) having a bottom plate (10), a cover (12) spaced apart from the bottom plate (10) in a housing height direction (Z), and a frame (13) connecting the bottom plate (10) to the cover (12), the frame (13) surrounding the housing interior (9) in a housing circumferential direction (U); The stationary inductive charging device (1) comprises a ventilation device (14), the ventilation device (14) comprising an air passage system (15) heat-transferably connected to the bottom plate (10) and having at least one air passage (20) for guiding air, at least one blower (16) for driving air in the air passage system (15), at least one air inlet (18) communicating with the surroundings (17) of the inductive charging device (1), and at least one air outlet (19) communicating with the surroundings (17). Inductive charging device (1).

2. The bottom plate (10) is in particular formed as a solid body.

2. An inductive charging device (1) according to claim 1.

3. Each of the air passages (20) is formed in a passage body (22) which is a separate component from the bottom plate (10). An inductive charging device (1) according to claim 1 or 2.

4. Each of the passage bodies (22) has a passage bottom (23), which defines the air passage (20) downward, is a separate component from the bottom plate (10), and is connected to the bottom plate (10) in a heat-transferring manner. An inductive charging device (1) according to any one of claims 1 to 3.

5. The frame (13) is hollow and defines a hollow chamber (26) surrounding the housing inner chamber (9). At least one air passage (20) of the air passage system (15) is formed or arranged within the hollow space (26) of the frame (13). An inductive charging device (1) according to any one of claims 1 to 4.

6. Each of the air inlets (18) and each of the air outlets (19) are formed in the frame (13). An inductive charging device (1) according to claim 5.

7. the frame (13) has an air exchange area (30) projecting outward in a direction transverse to the housing height direction (Z), the air exchange area (30) having at least one air inlet (18) and / or at least one air outlet (19), which may in particular be arranged at an angle relative to one another, In particular, it can be envisaged that each said fan (16) is arranged within said air exchange area (30), In particular, it can be envisaged that a cable passage (28) is guided through said air exchange area (30), 7. An inductive charging device (1) according to claim 6.

8. Two separate air passages (20) are arranged in the hollow chamber (26) of the frame (13), the two separate air passages (20) surrounding the housing interior (9) along the frame (13) in opposite directions, and connecting the respective air inlets (18) to the respective air outlets (19); At least one blower (16) for driving the air is disposed in each of the two air passages (20). An inductive charging device (1) according to claim 6 or 7.

9. The frame (13) is formed with two separate air inlets (18) and two separate air outlets (19), One of the air passages (20) connects one of the air inlets (18) to one of the air outlets (19), while the other of the air passages (20) connects the other of the air inlets (18) to the other of the air outlets (19). An inductive charging device (1) according to claim 8.

10. The frame (13) is formed with one common air inlet (18) and two separate air outlets (19), one of the air passages (20) connecting the common air inlet (18) to one of the air outlets (19), while the other of the air passages (20) connecting the common air inlet (18) to the other of the air outlets (19), or The frame (13) is formed with two separate air inlets (18) and one common air outlet (19), one of the air passages (20) connecting one of the air inlets (18) to the common air outlet (19), while the other of the air passages (20) connecting the other of the air inlets (18) to the common air outlet (19). An inductive charging device (1) according to claim 8.

11. The air inlets (18) and the air outlets (19) are arranged on different housing sides spaced apart from each other in a direction transverse to the housing height direction (Z). An inductive charging device (1) according to any one of claims 8 to 10.

12. the air inlet (18) and the air outlet (19) are arranged on the same housing side, in particular next to each other, An air passage (20) is formed or arranged in the hollow chamber (26) of the frame (13), the air passage (20) surrounds the housing interior chamber (9) along the frame (13) and connects the air inlet (18) to the air outlet (19). An inductive charging device (1) according to claim 6 or 7.

13. The inductive charging device (1) is configured as a double housing installation and has two separate housings (8): a first housing (8 １ ) and a second housing (8 ２ ) The coil (2) is inserted into the first housing (8 １ ) is arranged in the housing inner chamber (9), The power electronics (3) are housed in the first housing (8 １ The second housing (8) is arranged at a distance from the ２ ) are located within An inductive charging device (1) according to any one of claims 1 to 12.

14. The inductive charging device (1) is configured as a single-housing installation and has only one housing (8); The coil (2) and the power electronics (3) are arranged in the housing inner chamber (9) of the housing (8). An inductive charging device (1) according to any one of claims 1 to 6.

15. the air passages (20) of the air passage system (15) are arranged in the hollow chamber (26) of the frame (13) and form air inlet passages (20E) connected to the respective air inlets (18); the air passages (20) of the air passage system (15) are arranged in the hollow chamber (26) of the frame (13) and form air outlet passages (20A) connected to the respective air outlets (19); The air passage (20) of the air passage system (15) is arranged in the housing interior (9) and forms a connecting passage (20V) connecting the air inlet passage (20E) to the air outlet passage (20A), and each of the blowers (16) is arranged in the connecting passage (20V).

15. An inductive charging device (1) according to claim 14.

16. the bottom plate (10) projects outward beyond the frame (13) in a direction transverse to the housing height direction (Z) and has a heat radiation surface (33) which at least partially surrounds the frame (13) in the housing circumferential direction (U); An inductive charging device (1) according to any one of claims 1 to 15.

17. 1. An inductive vehicle charging system (7) for charging a battery of a battery electric vehicle, the inductive vehicle charging system (7) comprising: A stationary inductive charging device (1) according to any one of claims 1 to 16, a mobile inductive charging device located in each vehicle; Inductive vehicle charging system (7).

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