GB2524734A

GB2524734A - Receiving device, vehicle and method of manufacturing a receiving device

Info

Publication number: GB2524734A
Application number: GB1405716.0A
Authority: GB
Inventors: Marnix Lannoije; Dominik Anders; Simon Wechsler
Original assignee: Bombardier Transportation GmbH
Current assignee: Alstom Transportation Germany GmbH
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2015-10-07
Also published as: WO2015150297A3; GB201405716D0; WO2015150297A2

Abstract

A receiving device 1 for inductive power transfer to a vehicle comprises a housing 4, wherein a medium is contained in the housing 4 that has thermal coefficient of expansion smaller than that of air. The medium or filler may be or comprise oil, and it may have a coefficient of thermal conductivity higher than that of air. Part of the receiving device may be embedded in the medium so that the medium conducts heat from the receiving device element to surrounding environment. The medium may be contained in a chamber 11, 12, 13 within the housing 4, and the walls of the chambers or cavities 11, 12, 13 may be non-magnetic and may be oil proof, preventing the leakage of oil. Damage to the housing 4 due to thermal expansion of air is thereby avoided.

Description

Receiving device, vehicle and method of manufacturing a receiving device The invention relates to a receiving device, in particular a receiving device of a system for inductive power transfer to a vehicle. Further, the invention relates to a method of manufacturing such a receiving device. Further, the invention relates to a vehicle comprising such a receiving device.

While travelling on a route, a vehicle requires energy for driving (i.e. propulsion) and for auxiliary equipment which does not produce propulsion of the vehicle. Such auxiliary equipment includes, for example, lighting systems, heating and/or air conditioning systems, ventilation and passenger information systems. Not only track-bound vehicles (such as trams), but also road automobiles can be operated using electric energy.

Vehicles, in particular electric vehicles, may be provided with energy in different manners.

One option is to charge an energy storage on-board the vehicle while the vehicle stops and by using an electric cable connection. According to another option, the energy is transferred to the vehicle in a wireless manner using a magnetic field which induces an electric voltage in at least one inductance on-board the vehicle. The expression receiving device or pick-up has been used for the device which comprises at least one inductance.

The document GB 1215053.8 (not yet published) discloses such an inductive pick-up arrangement to be mounted on an electric vehicle which shall be operated with electric energy produced by the arrangement by magnetic induction. The arrangement comprises a pick-up portion comprising at least on electric inductance for receiving a magnetic field and for producing the electric energy. Further, the arrangement comprises a mounting portion to be mounted on the vehicle.

The transfer of electric energy to the vehicle by induction forms a background of the invention. A route-sided conductor arrangement which can also be referred to as primary winding structure produces an electromagnetic field. The field is received by a vehicle-sided conductor arrangement, e.g. a secondary winding structure or coil, on-board of the vehicle so that the field produces an electric voltage by induction. The transferred energy may be used for propulsion of the vehicle and/or for other purposes such as providing the auxiliary equipment of the vehicle with energy. The vehicle may be, for example, a vehicle having an electrically operated drive motor. However, the vehicle may also be a vehicle having a hybrid drive system, e.g. a system which can be operated by electric energy or by other energy, such as energy provided using fuel (e.g. natural gas, diesel fuel, petrol or hydrogen).

US 2008/0129246 Al discloses a non-contact type power feeder system comprising a power feeding portion provided along a track way for a mobile object, and a power receiving portion provided in the mobile object. The power feeding portion is being opposed face-to-face to the power receiving portion so as to feed a power thereto. The document further discloses an aluminum base board attached to a lower part of a mobile object by means of non-magnetic SUS balls inserted through bolt holes. Further disclosed is a protecting cover which is, for example, made of polycarbonate and which defines therein an internal accommodation space. The protecting cover is attached to the base board by non-magnetic balls inserted through boll holes. Wilhin the internal accommodation space of the protecting cover, an insulation panel is attached onto the base board. Within the internal accommodation space of the protecting cover, a planar core constituting the power receiving portion is composed of several planar blocks which are superposed one upon another and which are laid horizontally, being joined to one another by an adhesive. Windings are accommodated in a recess in the planar core. A weight of the planar blocks and Ihe windings is carried by Ihe protecting cover as the planar core is firmly joint to the rear surface of the protecting cover.

The GB 1313785.6 (not yet published) discloses a receiving device, in particular a receiving device of a system for inductive power transfer to a vehicle, comprising a carrying device and a top cover element, wherein the carrying device is attached to the top cover element. Further disclosed is a bottom cover element, wherein the bottom cover element is attached to the top cover element.

Usually, air is arranged within a housing oft the receiving device.

The operating temperature range of vehicles comprising such a receiving device is usually adapted to a predetermined temperature interval, e.g. to an interval of -25°C to +90°C or to +125°C or even more. In the case of inductive power transfer, thermal energy is generated by the electric elements and the housing, in particular an inner volume of the housing, is heated up. If a vehicle with a housing at a high temperature is moved to a cold environment, e.g. after an inductive charging process, a significant temperature drop can occur. Especially in winter season, a temperature drop can amount to a range of 50°C or even 1 00°C or even more, e.g. if the vehicle is moved out of a garage with an inductive charging station into the cold environment.

Such a temperature drop may cause a decrease in pressure within the housing as the volume of the air in the inner volume decreases. In such a case even a negative pressure can be generated. Such a negative pressure can cause humid air from outside, i.e. from an exterior volume, to break into the housing. As a result, condensed water can occur within the housing which may damage the electric elements, in particular the high voltage insulation system of said electric elements.

It is an object of the present invention to provide a receiving device, in particular a receiving device for inductive power transfer to a vehicle, which increases an operational safety of the receiving device, in particular an operational safety of the electric elements of the receiving device. It is a further object of the present invention to provide a method of manufacturing such a receiving device and a vehicle comprising such a receiving device.

It is a basic idea of the invention to arrange a medium within the housing of the receiving device which has a smaller thermal coefficient of expansion than air.

A receiving device, in particular a receiving device of a system for inductive power transfer to a vehicle, is proposed.

The present invention can be applied to any land vehicle (including, but not preferably, any vehicle which is only temporarily on land), in particular track-bound vehicles, such as rail vehicles (e.g. trams), but also to road automobiles, such as individual (private) passenger cars or public transport vehicles (e.g. busses including trolley busses which are also track-bound vehicles).

The receiving device can be attached or installed to a vehicle, in particular at a bottom side of the vehicle. The receiving device can comprise elements for the inductive transfer of energy. In particular, the receiving device can comprise electric elements. The proposed receiving device comprises or has a housing. Within the housing, the aforementioned elements of the receiving device can be arranged. The receiving device can e.g. comprise a secondary winding structure or a part thereof. Further, the receiving device can comprise a rectifier, e.g. for rectifying an alternating voltage generated by the secondary winding structure, and capacitive elements, in particular compensation capacitors for providing a desired reactance.

Further, the receiving device can comprise a cable bearing element which is adapted to position and/or to hold at least one line section of an electric line of the secondary winding structure, wherein the cable bearing element provides at least one guiding channel for the section of the electric line, ferrite elements, e.g. for providing a desired distribution or course of the magnetic flux, shielding elements, e.g. to guide field lines of the magnetic field and shield electric and/or electronic components from the electric field. The receiving device can e.g. comprise one or more of the following components: a secondary winding structure, at least one ferrite element, at least one capacitor, at least one power electronic element, at least one control unit, at least one communication means, at least one sensing device, at least one pressure compensation element, at least one connection element.

The at least one connection element can be a connection element for a power connection, e.g. an electric connection, in particular an AC (alternating current) connection, and/or a signal connection, e.g. a data connection, in particular a CAN bus connection. The at least one sensing device can be a device for sensing a temperature, a current or a voltage. The at least one communication means can be a means for a UHF (ultra-high frequency) communication.

All or at least some of said elements can be arranged within the housing of the receiving device, in particular in an inner volume of the housing. As will be explained later, all or at least some of said elements can be arranged within one or more chambers provided in the inner volume of the housing.

The housing can comprise or have a bottom side or a bottom cover. Further, the housing can comprise or have one or more sidewall(s). Further, the housing can comprise or have a top side or a top cover.

The bottom side, the sidewall(s) and/or the top side can enclose an inner volume. For instance, the bottom side, the sidewall(s) and/or the top side can provide inner wall sections which enclose an inner volume. The housing can also comprise inlets and/or outlets, e.g. for electric connectors, a signal line or other connecting means. Said inlets and/or outlets can be sealed such that the inner volume is sealed with respect to an exterior volume outside the housing.

At least one medium is arranged within the housing. The medium can e.g. be provided by a fluid. All or at least some of the aforementioned elements, in particular at least one part of an element, can be thermally coupled to the medium, e.g. directly or indirectly.

According to the invention, the medium has a thermal coefficient of expansion which is smaller than the thermal coefficient of expansion of air. The thermal coefficient of expansion of air can e.g. be 3.67 x iO K'.

The thermal coefficient of expansion relates to an area or volume expansion of the medium. It allows determining the expansion depending on a temperature change. The thermal coefficient of expansion can be defined or provided at predetermined environmental conditions, in particular at a constant pressure, e.g. atmospheric pressure.

This means that the proposed medium has a thermal coefficient of extension which is smaller than the thermal coefficient of expansion of air at predetermined environmental conditions, in particular at a predetermined pressure. As a result, the area or volume expansion of the medium which occurs at a predetermined temperature increase or temperature decrease will be smaller than the area or volume expansion of air for the same temperature increase or decrease. The said temperature increase or temperature decrease can occur at a constant pressure, e.g. atmospheric pressure.

The medium can be arranged in at least a part or portion of the inner volume of the housing. The medium can e.g. be arranged within the inner volume, in particular within at least one cavity within the inner volume. Preferably, the housing or the at least one cavity of the housing is completely filled with the proposed medium.

Further, the medium can be a static medium. This means that there will be no flow of the medium out of the housing under normal operating conditions. It is, however, possible that the housing comprises an inlet and/or outlet for exchanging the medium, e.g. if the medium is contaminated.

The proposed receiving device advantageously provides an improved functional safety as the pressure drop which is generated by a temperature drop within the housing is reduced compared to a housing which comprises only air. This, in turn, reduces the amount of humid air which enters the housing due to the pressure drop, in particular due to a negative pressure arising from a temperature drop. This, again, reduces the risk of damaging elements, in particular electric elements, of the receiving device by e.g. condensed water.

In a preferred embodiment, the medium has a thermal conductivity which is higher than the thermal conductivity of air. The thermal conductivity of air can e.g. be 0.026 W/(m x K).

The thermal conductivity can e.g. be given at predetermined environmental conditions, e.g. at a predetermined pressure, in particular atmospheric pressure.

In this case, the proposed medium can advantageously be used as a coolant inside the housing of the receiving device. The medium can transfer thermal energy, in particular thermal energy generated during inductive power transfer, from the inner volume of the housing to an exterior volume outside the housing. As the thermal conductivity of the medium is higher than air, a higher amount of thermal energy can be transferred to the exterior volume as in the case where air is arranged within the housing. This advantageously further increases the functional safety of the receiving device. Further, the amount of inductively transferred energy can be increased while not increasing a size of the receiving device.

In another embodiment, the medium is provided by oil or comprises oil. An oil can be a substance which is a viscous liquid at ambient temperatures, e.g. at any temperature between -40°C to ÷125t. Oil can be hydrophobic and lipophilic medium or fluid.

Oil advantageously provides a fluid which shows at least one of the aforementioned characteristics, in particular a low thermal coefficient of expansion and/or a high thermal conductivity.

In a preferred embodiment, the oil is a transformer oil. A transformer oil can e.g. be a refined mineral oil that is stable at high temperature and has predetermined electrical properties, e.g. properties concerning an insulating behavior, e.g. a predetermined conductivity and/or a predetermined breakdown voltage. Properties of transformer oils are e.g. listed in EN60296:201 2. Transformer oil can be used to insulate the electric elements arranged within the housing and further to suppress corona and arching. Further, transformer oil can have a predetermined high thermal conductivity. Thus, transformer oil can be advantageously used as a coolant.

Alternatively, the oil can be a silicon oil. The thermal expansion coefficient of silicon oil can e.g. be 0.9 x i0 K1. In this case, the volume deviation of silicon oil is approximately 76% less than the volume deviation of air for a predetermined temperature increase or decrease.

Alternatively, the oil can be a synthetic organic ester.

All the proposed alternatives are advantageously readily available in the market.

In another embodiment, at least one element, in particular at least one electric element, of the receiving device is arranged within the housing, wherein the medium is arranged such that a thermal coupling of the at least one element and an exterior volume is provided at least partially by the proposed medium. In other words, the at least one element is thermally coupled to the exterior volume by the medium. Additionally, the thermal coupling can be provided by an element of the housing, e.g. a section of the sidewall of the housing or a section of a bottom side of the housing and/or other elements arranged within the housing.

The medium can be directly or indirectly thermally coupled to the at least one element. In the case of a direct thermal coupling, the medium can be in contact with the at least one element or a part thereof. The at least one element can e.g. be embedded within the medium. This advantageously improves the cooling of the elements arranged within the housing. Alternatively, it is possible to arrange the at least one element, in particular, the at least one electric element, within another housing or casing or cover, e.g. an inner housing of the receiving device. In this case, the housing or casing or cover of the at least one element can be at least partially embedded in the medium. The inner housing itself can be filled with another medium, e.g. air. Thus, a good thermal coupling can be provided while the at least one element can be sealed from the medium.

In another embodiment, the at least one element, in particular the at least one electric element, is at least partially embedded in the medium. Preferably, the at least one element is fully embedded in the medium. In this case, the at least one medium is directly thermally coupled to the proposed medium. The medium can be arranged such that the at least one element is directly coupled to the housing by said medium. This can e.g. mean that an interspace between inner wall sections of the housing and at least one electric element is filled with the medium.

In another embodiment, the housing comprises at least one chamber, wherein the chamber is at least partially, preferably fully, filled with the medium. The housing can, of course, comprise more than one chamber. In this case, the chambers can be connected by means for a fluid connection, e.g. a fluid channel. A chamber can e.g. be provided by the aforementioned inner housing or cavity within the receiving device.

Within the at least one chamber, one or more elements, in particular electric elements, of the receiving device can be arranged. This advantageously allows designing a medium-proof housing, e.g. an oil-proof housing, wherein the risk of a medium loss or leakage is reduced.

In another embodiment, a chamber is provided or enclosed by wall elements, wherein a wall element is made of a non-magnetic material. A non-magnetic material denotes a material with no or only minimal magnetic conductivity. The non-magnetic material can e.g. be plastic or aluminium. This advantageously reduces an interaction between the receiving device and an electromagnetic field which is generated during inductive power transfer.

In another embodiment, the at least one chamber is oil-proof. This advantageously reduces the risk of leakage.

In another embodiment, at least one part of the housing, e.g. at least one part of a bottom side, a sidewall and/or a top side, is made of non-magnetic material. This advantageously reduces an interaction between the receiving device, in particular the housing of the receiving device, and an electromagnetic field which is generated during inductive power transfer.

Preferably, the parts or sections of the housing and/or of the wall elements which are exposed to the electromagnetic field during inductive power transfer are made of the non-magnetic material. In other words, parts of the housing and/or of the wall elements within a lower part of the housing can be made of the non-magnetic material. In this case, the secondary winding structure, e.g. receiving coils of the secondary winding structure, can also be arranged within the lower part of the housing. It is possible that non-magnetic material is only used within lower part of the housing.

It is also possible that the housing or at least a part of the housing consists of a material mixture, e.g. a mixture of aluminum and plastic. In this case, however, the lower part of the housing can be made of plastic only.

In the context of this invention, directional terms as "upper", "lower". "bottom", "top" refer to a first direction, wherein the first direction can be oriented parallel to a main direction of propagation of the electromagnetic field generated by a primary winding structure and received by a secondary winding structure of the receiving device. The first direction can denote a vertical direction which can be oriented orthogonal to a (plane) surface of a route on which a vehicle comprising the receiving device travels. In particular, the vertical direction can be perpendicular to a longitudinal direction which can be oriented parallel to a direction of travel if the vehicle travels straightforward. Also, the vertical direction can be oriented orthogonal to a surface of the bottom side of the housing.

This advantageously enables the magnetic power transfer via a charging pad located below the receiving device, e.g. laying flat on the ground.

In another embodiment, the housing comprises at least one pressure compensating element. The pressure compensating element allows an expansion of the medium, e.g. if the medium heated. The pressure compensating element e.g. denotes a deformable element which allows an extension or contraction of the medium, e.g. in the case that the medium is heated up.

The at least one pressure compensating element can be a part of a section of the housing, in particular a part of a section of the bottom side, a sidewall or, preferably, of the top side. The pressure compensating element can provide a separator of the medium-filled section of the housing and another section of the housing and/or the exterior volume.

The pressure compensating element can e.g. provide a separator of the inner volume and the exterior volume of the housing. The pressure compensating element can e.g. be designed as a rubber membrane. The pressure compensating element can be impermeable for the proposed medium. It is possible that a medium connection, e.g. a channel, is provided within the housing which connects the medium-filled section of the housing, e.g. one or more chambers, to the pressure compensating element.

This advantageously reduces the risk of generating an undesirable high pressure, especially in the case where the housing is heated up.

Further proposed is a method of manufacturing a receiving device, in particular a receiving device of a system for inductive power transfer to a vehicle, wherein -a housing is provided, -a medium is provided, -the medium is arranged within the housing.

Further, the medium has a thermal coefficient of expansion which is smaller than the thermal coefficient of expansion of air.

Thus, a method of manufacturing a receiving device according to one of the aforementioned embodiments is proposed.

Further proposed is a vehicle, in particular an electric vehicle, with a receiving device according to one of the aforementioned embodiments.

The invention will be described with reference to the attached figures. The figures show: Fig. 1 a schematic side view of a vehicle with a receiving device according to the state of the art, Fig. 2 a schematic top view on a proposed receiving device, Fig. 3 a schematic side view of the receiving device shown in Fig. 2, and Fig. 4 a perspective view of a receiving device.

Fig. 1 shows a schematic side view of a vehicle 3 which can e.g. be an electric vehicle.

The vehicle 3 comprises a receiving device 1. The receiving device 1 comprises a housing 4. It is shown that the receiving device 1 is installed at a bottom side of the vehicle 3. The vehicle 3 is arranged above a charging pad 2 which is installed within the ground 5 under a surface 6 of a route. It is of course possible to install the charging pad 2 on the surface 6 of the route. The charging pad 2 can comprise at least a primary winding structure (not shown) for generating an alternating electromagnetic field.

Further shown is a coordinate system with a longitudinal axis x, wherein a longitudinal direction is indicated by an arrowhead of the longitudinal axis x. Further shown is a vertical axis z wherein a vertical direction is indicated by an arrowhead of the vertical axis z. In the context of this invention, the terms "top", "bottom", "under", "above" can relate to the vertical direction. It is shown that the vertical axis z is oriented perpendicular to the surface 6 of the route and an outer surface of the bottom side 7 of the housing 4 of the receiving device 1.

Fig. 2 shows a schematic top view on the receiving device 1. The housing 4 of the receiving device 1 comprises a first sidewall 4a, a second sidewall 4b, a third sidewall 4c and a fourth sidewall 4d. Thus, the housing 4 is box-shaped. It is, of course, possible that the housing 4 has another geometric shape, e.g. an organic shape.

Within an inner volume 8 of the housing 4, three chambers 11, 12, 13 are arranged or provided. Within a first chamber 11, a rectifier (not shown) of the receiving device 1 can be arranged. Within a second chamber 12, a secondary winding structure of the receiving device 1 (not shown) can be arranged. Within a third chamber 13 capacitive elements, e.g. so-called compensating capacitors (not shown), can be arranged. It is shown that the chambers 11, 12, 13 are connected by channels 15 which provide a fluid connection.

Within the chambers 11, 12, 13 and also within the channels 15, oil 14 is arranged. Thus, the not shown rectifier, the secondary winding structure and the capacitive elements are embedded in oil 14. In particular, the chambers 11, 12, 13 and the channels 15 can be fully tilled with oil 14. Also shown is an exterior volume 19 outside the housing 4.

Fig. 3 shows a schematic side view of the receiving device 1 shown in Fig. 2. Again shown are two sidewalls 4a, 4b. Further shown is a top side 4e and a bottom side 41 of the housing 4. Further shown are the chambers 11, 12, 13. A section 16 of the bottom side 41 of the housing 4 is provided by a plastic element. The remaining elements of the housing 4, in particular the sidewalls 4a, 4b, 4c, 4d, top side 4e and the remaining sections of the bottom side 4f are made of aluminium 17.

As shown in Fig. 3, the plastic element 16 has a length which is longer than the length of the second chamber 12, wherein the length is measured along the longitudinal axis x.

Further, the plastic element 16 can have a width which is greater than the width of the second chamber 12 in a lateral direction (not shown). The lateral direction can be oriented perpendicular to the shown longitudinal direction and vertical direction. Thus, an electromagnetic field generated by a primary winding structure and/or received by the secondary winding structure will only or for the most part extend through the plastic element 16.

Further shown is a rubber membrane 18 which provides a part of the top side 4e of the housing 4. The rubber membrane 18 provides a detormable element which is arranged in between an inner volume S of the housing 4 and an exterior volume 19 arranged outside the housing 4. Not shown is a fluid connection of one of the chambers 11, 12, 13 or all chambers 11, 12, 13 to the rubber membrane 18. The rubber membrane 18 is not pervious for oil 14. The rubber membrane 18 allows an expansion of the oil 14 within the chambers 11, 12, 13 and the corresponding fluid connection, e.g. if the oil 14 is heated.

The oil 14 can transfer thermal energy from electric elements, in particular from active electric elements such a the rectifier, the secondary winding structure and the capacitive elements, to the elements of the housing 4, in particular to the sidewalls 4a 4d, to the top side 4e and to the bottom side 4f. Thus, thermal energy can be transferred to the exterior volume 19 and the inner volume 8 if the housing 4 is cooled.

It is shown in Fig. 2 and Fig. 3 that the housing 4 comprises three chambers 11, 12, 13 which are connected by channels 15. The channels 15 can have a diameter which is smaller than a maximal dimension of a chamber 11, 12, 13 e.g. smaller than a maximal length and/or width and/or height. It is of course possible to combine two or more, e.g. the three, chambers 11, 12, 13 to a single chamber, wherein the aforementioned electric elements such as the rectifier, the secondary winding structure and the capacitive elements be arranged in different sections of the single chamber. In particular, the second and the third chamber 11, 12 can be provided by one single chamber. In this case, the housing 4 comprises two chambers, wherein a rectifier can be arranged in a first chamber and the secondary winding structure and the capacitive elements can be arranged in the remaining chamber.

Fig. 4 shows a perspective view of a receiving device 1. The receiving device 1 shown in Fig. 4 is in a large part designed as the receiving device in Fig. 3. The receiving device 1 shown in Fig. 4 comprises a thermal interface element 20. Said thermal interface element can be made of aluminum. The thermal interface element 20 can be arranged above the first chamber 11 and thus above an element arranged in the first chamber, e.g. a rectifier comprising heat generating power electronic elements. By means of the thermal interface element 20, thermal energy can be transferred via the oil 14 (see Fig. 2) and the thermal interface element 20 to an exterior volume 19, in particular to a vehicle chassis (not shown) if the receiving device 1 is attached to such vehicle chassis. Further, the receiving device can comprise connectors 21 for providing an electric power connection and a signal connection to components of the receiving device 1.

The shown receiving device eliminates the need for a complex and expensive oil compensating reservoir.

The proposed receiving device 1 is especially suited for driving under water. It is possible that a vehicle 3 must be designed such that it is able to drive through water with a predetermined depth, e.g. 0.5m. Also, it is possible that a vehicle must be designed such that it is able to park in such water for a predetermined amount of time, e.g. 0.5 hours.

Since the receiving device can provide one of the lowest parts on the vehicle and will therefore be fully under water, the receiving device should be designed such that at least one, preferably both, criteria are fulfilled. This can e.g. result in the fact that certain materials, e.g. pressure compensation element with e.g. goretex membrane, are not allowed. In summary, the receiving device can be designed as a waterproof device. Thus, high voltage components arranged within the receiving device are protected from water.

Claims

Claims 1. A receiving device (1), in particular a receiving device (1) of a system for inductive power transfer to a vehicle (3), wherein the receiving device (1) comprises a housing (4), wherein at least one medium is arranged within the housing (4), characterized in that the medium has thermal coefficient of expansion which is smaller than the thermal coefficient of expansion of air.
2. The receiving device according to claim 1, characterized in that the medium has a thermal conductivity which is higher than the thermal conductivity of air.
3. The receiving device according to one of the claims 1 or 2, characterized in that the medium is provided by oil (14) or comprises oil (14).
4. The receiving device according to claim 3, characterized in that the oil (14) is a transformer oil, a silicon oil or a synthetic organic ester.
5. The receiving device according to one of the claims 1 to 4, characterized in that at least one element of the receiving device (1) is arranged within the housing (4), wherein the medium is arranged such that a thermal coupling of the at least one element and an exterior volume (19) is provided at least partially by the medium.
6. The receiving device according to claim 5, characterized in that the at least one element is at least partially embedded in the medium.
7. The receiving device according to one of the claims 1 to 6, characterized in that the housing (4) comprises at least one chamber (11, 12, 13), wherein the chamber (11, 12, 13) is at least partially filled with the medium.
8. The receiving device according to claim 7, characterized in that a chamber (11, 12, 13) is provided by wall elements, wherein a wall element is made of a non-magnetic material.
9. The receiving device according to one of the claims 7 orB, characterized in that the at least one chamber (11, 12, 13) is oil-proof.
10. The receiving device according to one of the claims 1 to 9, characterized in that at least one part of the housing (4) is made of a non-magnetic material.
11. The receiving device according to one of the claims ito 10, characterized in that the housing (4) comprises at least one pressure compensating element.
12. A method of manufacturing a receiving device (1), in particular a receiving device (1) of a system for inductive power transfer to a vehicle (3), wherein -a housing (4) is provided, -a medium is provided, -the medium is arranged within the housing (4), characterized in that the medium has thermal coefficient of expansion which is smaller than the thermal coefficient of expansion of air.
13. A vehicle with a receiving device (1) according to one of the claims ito 11.