JP2020198763A - Power reception device - Google Patents

Abstract

To provide a power reception device which receives high electric power and achieves improvement of heat radiation efficiency.SOLUTION: A power reception device 30 may attached to an attachment surface 16a at a vehicle bottom part and receives, while a vehicle is running, alternating-current power from a power transmission device having a power transmission coil, into which alternating-current power is input, and supplies electric power to a battery pack. The power reception device 30 includes: a power reception coil 31 which may receive electric power from the power transmission coil in a non-contact manner; a housing 40 which houses the power reception coil; and an attachment part 52 which may attach the housing to the attachment surface in a state where a space S opening at least in a vehicle fore and aft direction is formed between the housing and the attachment surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power receiving device that can be attached to the lower surface of a vehicle body and receives AC power from a power transmitting device in a non-contact manner.

Conventionally, as a non-contact power transmission device that non-contactly transmits power to the other side without using a power cord or a power transmission cable when charging an electric vehicle or the like, a device using magnetic field resonance or electromagnetic induction is known. .. In order to charge an electric vehicle or the like, it is necessary to transmit and receive a large amount of electric power, and loss, that is, heat generation tends to be large. Therefore, a cooling device may be provided in the power receiving device. For example, the cooling device of Patent Document 1 is provided outside the housing of the non-contact power receiving device, and heat is transferred from this housing. The cooling device is provided with a flow path for flowing water inside the cooling device, and the heat transferred from the housing is released to the water to cool the non-contact power receiving device.

JP-A-2018-93589

In a configuration in which the power receiving device is cooled by a water-cooled cooling device, the handling of the cooling water is complicated and the cooling device tends to be large. Further, in a recent electric vehicle in which a large-capacity battery pack is spread on the bottom of the vehicle, when a non-contact power receiving device is provided on the bottom of the vehicle, heat is transferred to the battery pack from the non-contact power receiving device and its cooling device, and the battery May cause high temperature deterioration.

The present invention has been made in view of the above problems, and a main object thereof is to provide a power receiving device that receives a large amount of electric power and has improved heat dissipation efficiency.

This means can be attached to the lower surface (16a) of the vehicle body of the vehicle (15), and the AC power is transmitted from a power transmission device (20) having a power transmission coil (21) into which AC power is input while the vehicle is running. A power receiving device (30) that receives power and supplies power to the power storage device (17), the power receiving coil (31) that can receive power from the power transmission coil in a non-contact manner, and a housing (40) that houses the power receiving coil. With the mounting portion (52) capable of mounting the housing on the lower surface of the vehicle body in a state where at least a space (S) opened in the front-rear direction of the vehicle is formed between the housing and the lower surface of the vehicle body. , Equipped with.

It is desirable that the power receiving device that receives power from the power transmitting device buried or laid on the road surface while the vehicle is running supplies the vehicle with power equal to or higher than the power consumption during running. However, when such a large amount of electric power is received in a non-contact manner, the loss (heat generation) tends to be large. Further, in an electric vehicle, a large-capacity battery pack (power storage device) may be spread on the bottom of the vehicle (near the lower surface of the vehicle body), and when the heat of the power receiving device attached to the lower surface of the vehicle body is transferred to the battery pack, the battery May cause high temperature deterioration.

Therefore, the power receiving device is in a state where a space of at least a predetermined interval opened in the front-rear direction is formed between the housing accommodating the power receiving coil and the lower surface of the vehicle body, that is, the housing is floated from the lower surface of the vehicle body. Was made available for installation. The power receiving device of this means is configured to receive AC power from the power transmission device side while the vehicle is running, and it is possible to cool by the running wind passing between the housing and the underside of the vehicle body while the vehicle is running. It has become. In this case, heat can be dissipated not only from the lower surface of the housing (the surface on the road side) but also from the surface between the housing and the lower surface of the vehicle body, and the heat dissipation efficiency (cooling efficiency) can be improved.

Schematic configuration of the non-contact power transmission device according to the embodiment Schematic cross-sectional view of power receiving equipment Schematic configuration of the power receiving coil Schematic perspective view of the shield The figure which shows the relationship between the height between a mounting surface and a shield body, and the temperature of a power receiving device The figure which shows the temperature of the power receiving device in the structure of this embodiment and the conventional structure. Schematic configuration of the power receiving device in another embodiment Schematic configuration of the power receiving device in another embodiment Schematic configuration of the power receiving device in another embodiment

<Embodiment>
The present embodiment targets a power receiving device mounted on a vehicle. In the following description, the front-rear direction of the vehicle, that is, the left-right direction in FIG. 1 is the front-rear direction, the up-down direction of the vehicle, that is, the up-down direction in FIG. 1 is the up-down direction, and the directions orthogonal to the front-rear direction and the up-down direction are the left-right directions. It is explained as.

FIG. 1 is a schematic configuration diagram of the non-contact power transmission device 10 according to the present embodiment. The vehicle 15 is, for example, a vehicle that travels on an electric vehicle drive device (drive motor or the like) such as an EV (electric vehicle) or a PHV (plug-in hybrid vehicle).

The power transmission device 20 transmits (powers) AC power in a non-contact state with the power receiving device 30 mounted on the vehicle 15. The power transmission device 20 is buried in the road G or laid on the road G so as to be exposed from the road G. A plurality of power transmission devices 20 are buried side by side along the traveling direction of the vehicle 15, for example, on the road G on which the vehicle 15 travels. Further, the power transmission device 20 transmits power while the vehicle 15 is traveling.

The power transmission device 20 includes a power transmission coil 21. The power transmission coil 21 is formed by winding a lead wire (for example, a litz wire) around a core material such as a ferrite core in a plane, for example. The power transmission coil 21 is arranged so that the direction in which the wire wound in a plane is arranged is parallel to the road surface of the road G.

The power receiving device 30 includes a power receiving coil 31 capable of receiving AC power from the power transmitting coil 21 in a non-contact manner. The housing 40 of the power receiving device 30 accommodating the power receiving coil 31 is attached to a mounting surface 16a located at the bottom 16 of the vehicle 15 which is the lower surface of the vehicle body. In the power receiving coil 31, the direction in which the wire wires 31a wound in a plane are arranged is parallel to the road surface of the road G. As a result, the power receiving coil 31 is arranged so as to face the power transmitting coil 21 in parallel. The power receiving device 30 is attached between the front wheels and the rear wheels of the vehicle 15 and at a position between the left and right wheels of the vehicle 15. The bottom portion 16 indicates a portion located below the vehicle 15 including the lower surface of the vehicle body (mounting surface 16a), such as a floor portion and an undercover forming the vehicle interior of the vehicle 15.

The electric power received by the power receiving device 30 is supplied to the battery pack 17 which is a power storage device. The battery pack 17 is, for example, a secondary battery (lithium ion battery, nickel hydrogen battery, or the like). The battery pack 17 stores the electric power supplied from the power receiving device 30 and supplies the electric power to the vehicle driving device. The battery pack 17 is spread on the bottom 16 of the vehicle 15.

FIG. 2 is a schematic cross-sectional view of the power receiving device 30 in a state of being mounted on the mounting surface 16a of the vehicle 15. The power receiving device 30 includes a power receiving coil 31, a bobbin 32 around which a lead wire 31a of the power receiving coil 31 is wound, a ferrite core 33 as an iron core, and a housing 40 accommodating these power receiving coils 31 and the like. As shown in FIGS. 1 and 2, the housing 40 has a rectangular parallelepiped shape. The housing 40 includes a resin cover 41 that covers the lower surface of the bobbin 32 and the like, and a shield portion 50 that suppresses leakage of noise generated by the power receiving coil 31 to the vehicle 15 side.

FIG. 3 is a schematic configuration diagram of the power receiving coil 31. As shown in FIGS. 2 and 3, the power receiving coil 31 is formed by winding a lead wire 31a (for example, a litz wire) in a plane, and is a rectangular flat surface that matches the shape of the housing 40. It is a coil. The power receiving coil 31 has a portion A1 on both sides in the width direction in which the lead wire 31a extends in the front-rear direction, and an intermediate portion A2 between the portions A1 on both sides in the width direction. The lead wire 31a of the power receiving coil 31 is positioned by being wound along a groove 32a formed in the resin bobbin 32.

The cover 41 forms the lower surface of the housing 40, and is made of a resin that does not interfere with the transmission of electric power (passage of magnetic flux) between the power receiving coil 31 and the power transmitting coil 21. The cover 41 can be fixed to the shield portion 50 and has a size capable of covering the bobbin 32. Further, the cover 41 has a plate thickness capable of supporting the bobbin 32, the power receiving coil 31, and the like. Then, the lead wire 31a of the power receiving coil 31 is fixed by sandwiching the bobbin 32 and the cover 41.

The bobbin 32 is arranged on the shield portion 50 side with the lead wire 31a interposed therebetween. Further, the lead wire 31a is wound while being in the groove 32a of the bobbin 32. As a result, the bobbin 32 having a large contact area with the lead wire 31a is arranged on the shield portion 50 side having high heat transferability. Therefore, the heat generated by the lead wire 31a is transmitted to the shield portion 50 side via the bobbin 32.

A ferrite core 33 is arranged above the power receiving coil 31. The ferrite core 33 is formed of ferrite, which is a material having high magnetic permeability and low conductivity. The ferrite core 33 has a higher heat transfer property than the bobbin 32, and does not hinder the heat of the power receiving coil 31 from being transferred to the shield portion 50. At least a part of the power receiving coil 31 and the bobbin 32 may be in direct contact with the shield portion 50 without passing through the ferrite core 33.

FIG. 4 is a schematic perspective view of the shield portion 50. The shield portion 50 is provided in order to suppress leakage of noise to the vehicle 15 side, for example, to suppress an overcurrent generated on the vehicle 15 side due to leakage flux or the like. The shield portion 50 is made of non-magnetic metal, for example, aluminum, and has a flat plate-shaped shield main body portion 51 having a predetermined thickness. The shield main body 51 also functions as a cooling member for dissipating heat transmitted from the power receiving coil 31 and cooling the power receiving device 30.

Mounting portions 52 are provided at both ends in the width direction (left-right direction) orthogonal to the front-rear direction of the shield main body portion 51. The mounting portion 52 is a protruding portion extending in a plate shape in the front-rear direction. As a result, a space S opened in the front-rear direction, that is, a flow path extending in the front-rear direction is formed between the mounting surface 16a of the vehicle 15 and the shield main body 51. Further, the mounting portion 52 has a vertical dimension capable of securing a predetermined space dimension h between the shield main body portion 51 and the mounting surface 16a of the vehicle 15. That is, the mounting portion 52 projects upward by the space dimension h from the shield main body portion 51. Only the mounting portion 52 of the power receiving device 30 is in contact with the mounting surface 16a of the vehicle 15, and the power receiving device 30 is mounted in a state of floating from the mounting surface 16a of the vehicle 15.

It is desirable that the space dimension h of the space S formed between the shield main body 51 and the mounting surface 16a of the vehicle 15 is 5 mm or more. FIG. 5 is a diagram showing the relationship between the space dimension h between the mounting surface 16a and the shield main body 51 and the temperature of the power receiving device 30. As a result of the inventor's experiment, it was discovered that the temperature value of the power receiving device 30 is generally converged when the space dimension h is 5 mm or more, and the heat dissipation efficiency is expected to be improved more than desired. Therefore, the space dimension h is preferably 5 mm or more.

Further, as shown in FIG. 4, the mounting portion 52 is provided with a bolt insertion hole 52a through which a bolt for fixing the power receiving device 30 is inserted into the bottom portion 16 of the vehicle 15. Since the mounting portion 52 extends in the front-rear direction, a plurality of bolt insertion holes 52a (three in the present embodiment) are provided so as to line up in the front-rear direction. Further, since the mounting portion 52 extends in the front-rear direction, the contact area between the mounting portion 52 and the mounting surface 16a is increased, and the mounting portion 52 can be fixed at a plurality of places, so that the load per fixing place can be dispersed. The load applied to the mounting portion 52 includes the weight of the shield main body portion 51 and the power receiving coil 31 having a predetermined thickness as a single plate. In order to support these loads, the bolts for fixing are relatively large, and the bolt insertion holes 52a are also large. The mounting portion 52 in which the bolt insertion hole 52a is formed also has a predetermined width.

Of the upper surface and the lower surface of the housing 40, the upper surface, that is, the facing surface facing the mounting surface 16a, is provided with a thin plate-shaped heat radiating fin 53 which is a heat radiating portion protruding toward the mounting surface 16a. If the heat radiating fins are provided on the lower side of the housing 40, the amount of protrusion downward from the mounting surface 16a of the vehicle 15 increases, which is not preferable. Further, if the heat radiating fins are provided on the lower side of the housing 40, there is a high risk of damage due to contact with foreign matter or the like on the road G. Therefore, a heat radiating fin 53 extending in the front-rear direction is provided on the upper surface of the shield main body 51. The heat radiating fins 53 are provided at equal intervals over the entire width direction. The heat radiating fin 53 forms a flow path for the traveling wind. By passing the traveling wind between the heat radiating fins 53, the area in contact between the shield portion 50 and the traveling wind can be increased, and the cooling efficiency (radiation efficiency) can be improved. The height of the heat radiating fins 53 (vertical dimension) is lower than the height of the mounting portion 52 (spatial dimension h), and heat is also radiated from the upper surface of the heat radiating fins 53. Further, the heat radiating portion may be columnar instead of a thin plate.

Next, how much cooling efficiency can be expected in the power receiving device 30 of the present embodiment will be described in comparison with the conventional configuration. In the conventional power receiving device as a comparative example, the shield main body 51 is in direct contact with the mounting surface 16a. That is, no space is provided between the conventional power receiving device and the mounting surface 16a of the vehicle 15. The configuration other than the shield portion is similar to the configuration of the present application.

In the conventional configuration, heat dissipation of the power receiving device is mainly performed from the lower surface of the power receiving device. However, the lower surface of the power receiving device is made of resin for transmitting and receiving electric power to and from the power transmitting device 20, and the heat dissipation is not so good. Further, if a metal surface for cooling, a heat radiation fin, or the like is partially formed on the lower surface side, the metal part becomes a path of magnetic flux and is heated, which does not contribute to heat dissipation of the power receiving coil 31. Further, a battery pack 17 is provided above the power receiving device. Therefore, if the heat of the power receiving device is transferred to the battery pack 17, the battery pack 17 may deteriorate at a high temperature.

Therefore, in the present embodiment, a space S is provided between the power receiving device 30 and the mounting surface 16a of the vehicle 15. Specifically, a space S through which running wind passes is provided between the metal shield main body 51 having high heat transfer, that is, high heat dissipation, and the mounting surface 16a. As a result, heat can be dissipated from the highly heat-conducting metal shield main body 51, and the cooling efficiency can be improved. Further, since the contact between the power receiving device 30 and the mounting surface 16a of the vehicle 15 is limited to the mounting portion 52, it is difficult for the heat of the power receiving device 30 to be transferred to the battery pack 17.

FIG. 6 shows the power receiving device 30 when 35 kW is transmitted by non-contact power feeding at an environmental temperature of 55 ° C. and a running wind of 26.4 m / s (equivalent to 95 km / h) between the present embodiment and the conventional example. Is the temperature at. More specifically, it is the temperature at the contact position of the vehicle 15 with the mounting surface 16a, that is, the temperature at the mounting portion 52 in the present embodiment, and in the conventional example, the temperature at the central portion of the power receiving device 30. .. The loss (heat generation) in the power receiving coil 31 is about 1.2 kW. In this case, the configuration of the present embodiment shows 60.9 ° C, whereas the conventional configuration shows 114.2 ° C. That is, it is shown that the configuration of the present embodiment has a sufficient cooling effect.

The present embodiment described above has the following effects.

In the present embodiment, a state in which a space S having at least a predetermined interval opened in the front-rear direction is formed between the housing 40 accommodating the power receiving coil 31 and the mounting surface 16a of the vehicle 15, that is, the housing 40 is mounted on the vehicle 15. The power receiving device 30 can be attached while floating from the bottom portion 16. As a result, the traveling wind passes between the housing 40 and the mounting surface 16a while the vehicle 15 is traveling. Therefore, heat can be dissipated not only from the lower surface of the housing 40 (the surface on the road G side) but also from the surface between the housing 40 and the mounting surface 16a, and the cooling efficiency can be improved.

The mounting portions 52 are provided at at least two locations in the width direction orthogonal to the front-rear direction of the vehicle 15, and are projecting portions so as to extend in the front-rear direction. As a result, a flow path extending in the front-rear direction is formed between the mounting surface 16a and the housing 40, and is easily cooled by the running wind. Further, since it extends in the front-rear direction, the contact area between the mounting portion 52 and the mounting surface 16a of the vehicle 15 becomes large, and it becomes easy to fix the mounting portion 52 to the mounting surface 16a.

Further, by limiting the contact between the power receiving device 30 and the mounting surface 16a of the vehicle 15 to the mounting portion 52 which is a part of the power receiving device 30, heat transfer from the power receiving device 30 to the vehicle 15 side can be suppressed. .. Therefore, even if the battery pack 17 is spread on the bottom 16 of the vehicle 15, high temperature deterioration of the battery pack 17 can be suppressed.

If heat radiation fins are provided on the lower surface of the housing 40 of the power receiving device 30, the amount of protrusion downward from the mounting surface 16a of the vehicle 15 increases. Further, if the heat radiation fins are provided on the lower surface of the housing 40, there is a risk of damage. Therefore, the lower surface of the housing 40 is not suitable for providing heat radiation fins. On the other hand, the upper surface of the housing 40 (the surface facing the mounting surface 16a) is less likely to be damaged even if the heat radiation fins 53 are provided, and does not affect the amount of protrusion downward. Therefore, the structure is such that the heat radiation fins 53 are provided on the upper surface of the housing 40. As a result, the area where the housing 40 comes into contact with the running wind can be increased by the heat radiation fins 53, and the cooling efficiency can be improved.

Since the lower surface of the housing 40 of the power receiving device 30 needs to pass magnetic flux, it is formed of, for example, resin, and the heat dissipation efficiency is not good. On the other hand, a metal shield portion 50 is provided on the upper surface side of the housing 40 of the power receiving device 30 so that noise does not leak to the vehicle 15 side. A space S through which the running wind passes is provided between the metal shield portion 50 and the mounting surface 16a. As a result, heat can be dissipated from the metal shield portion 50 having high heat transfer property, and the cooling efficiency can be improved.

The bobbin 32 is arranged on the shield portion 50 side. Further, the lead wire 31a is wound while being in the groove 32a of the bobbin 32. As a result, the bobbin 32 having a large contact area with the lead wire 31a is arranged on the shield portion 50 side having high heat transferability. Therefore, the heat generated by the lead wire 31a is transmitted to the shield portion 50 side via the bobbin 32, and the cooling efficiency of the power receiving device 30 can be improved.

As a result of the inventor's experiment, it was confirmed that when the dimension between the housing 40 and the mounting surface 16a is 5 mm or more, the heat dissipation efficiency is expected to be improved more than desired. Therefore, the vertical dimension of the mounting portion 52 is set so that the distance between the housing 40 and the mounting surface 16a is 5 mm or more. Thereby, a desired heat dissipation efficiency can be ensured.

<Other embodiments>
The present invention is not limited to the above-described embodiment, and may be implemented as follows, for example.

-The power transmission coil 21 and the power reception coil 31 may have multiple phases. For example, in a state where the three-phase multiphase power receiving coils 31 are displaced from each other, at least a part thereof may be transferred to the shield main body 51 via a ferrite core 33 or the like.

-As shown in FIG. 7, the heat radiating fins 53 may be provided not in the entire area of the housing 40 but in a part thereof. Specifically, as shown in FIG. 7A, of the portion where the lead wire 31a of the power receiving coil 31 is arranged and the portion where the lead wire 31a of the power receiving coil 31 is not arranged, the lead wire 31a of the power receiving coil 31 It is good that it is provided in the part where is arranged. That is, the heat radiation fins 53 may not be provided in the portion where the power receiving coil 31 is not arranged.

The amount of heat generated per unit area is different between the portion where the power receiving coil 31 is arranged and the portion where the power receiving coil 31 is not arranged. Further, when the heat radiating fins 53 are provided in the entire area of the housing 40, the weight thereof becomes heavy. Therefore, when it is necessary to reduce the weight of the power receiving device 30, it is not desirable to provide the heat radiation fins 53 over the entire area of the housing 40. Therefore, by partially not providing the heat radiation fins 53, it is possible to improve the cooling efficiency per the heat radiation fins 53 while reducing the weight.

Further, as shown in FIG. 7 (b), on the upper surface of the housing 40, both sides in the width direction of the portion A1 on both sides in the width direction extending in the front-rear direction in the width direction of the housing and the intermediate portion A2 between them. The heat radiating fin 53 may be provided on the A1. In the housing 40, the amount of heat generated differs in the width direction of the housing 40 between the portions A1 on both sides in the width direction and the intermediate portion A2 in between, and the amount of heat generated in the portions A1 on both sides in the width direction is larger. Therefore, heat radiation fins 53 are provided in the portions A1 on both sides in the width direction. As a result, by providing the heat radiation fins 53 at a position where the amount of heat generated is large, it is possible to improve the cooling efficiency per the heat radiation fins 53 while reducing the weight.

As shown in FIG. 8, the housing 40 may be provided with a guiding portion 42 that guides the running wind into the space S formed between the housing 40 and the mounting surface 16a. Specifically, at the front end portion of the cover 41, an inclined surface that projects downward toward the front is provided as the guide portion 42. As a result, the running wind is guided to the space S between the housing 40 and the mounting surface 16a, and the cooling efficiency can be improved.

As shown in FIG. 9, a closing portion 54 capable of closing the opening of the space S formed between the housing 40 and the mounting surface 16a may be provided. Specifically, for example, a rotatable plate-shaped closing portion 54 may be provided at the end portion of the shield main body portion 51 in the front-rear direction. As a result, the closed portion 54 is closed during the period when the power receiving device 30 is not receiving power and heat dissipation is not required. By closing the closed portion 54 during the period when heat dissipation is not required, it is possible to prevent dust, mud, etc. from entering the space S and blocking the space S.

-The power receiving device 30 may include a water cooling device. Specifically, a water cooling device may be provided on the shield main body 51 as a part of the housing 40. In this case, it is preferable to provide a space S between the water cooling device and the mounting surface 16a of the vehicle 15. As a result, in addition to the cooling by the water cooling device, the cooling is performed by the traveling wind passing through the space S, so that the structure of the water cooling device can be simplified. Further, since the space S is formed between the water cooling device and the mounting surface 16a, it is possible to suppress heat transfer from the water cooling device to the battery pack 17.

-The mounting portion 52 may not have a plate shape extending in the front-rear direction, but may have a columnar shape provided with a bolt insertion hole 52a. Further, it is not limited to both ends and may be provided at other positions. Further, it is preferable that they are attached at two or more places in the width direction (left and right).

15 ... Vehicle, 16 ... Bottom, 16a ... Mounting surface, 17 ... Battery pack, 20 ... Power transmission equipment, 21 ... Power transmission coil, 30 ... Power receiving equipment, 31 ... Power receiving coil, 40 ... Housing.

Claims (9)

The AC power is received and stored from a power transmission device (20) having a power transmission coil (21) that can be attached to the lower surface (16a) of the vehicle body of the vehicle (15) and transmits AC power while the vehicle is running. A power receiving device (30) that supplies power to the device (17).
A power receiving coil (31) capable of receiving power from the power transmission coil in a non-contact manner,
A housing (40) accommodating the power receiving coil and
A mounting portion (52) that allows the housing to be mounted on the lower surface of the vehicle body in a state where at least a space (S) opened in the front-rear direction of the vehicle is formed between the housing and the lower surface of the vehicle body. Power receiving equipment to be equipped. The power receiving device according to claim 1, wherein the mounting portions are provided at at least two locations in the width direction of the housing orthogonal to the front-rear direction of the vehicle, and are projecting portions extending in the front-rear direction of the vehicle. The power receiving device according to claim 1 or 2, wherein a heat radiating portion (53) projecting toward the lower surface of the vehicle body is provided on the surface of the housing facing the lower surface of the vehicle body. The power receiving coil is a flat coil wound in a rectangular shape.
On the facing surface, the power receiving coil extends on both sides in the width direction extending in the front-rear direction in the width direction of the housing orthogonal to the front-rear direction of the vehicle, and the intermediate portion between them is formed on both sides in the width direction. The power receiving device according to claim 3, wherein a heat radiating unit is provided. The housing is arranged on the upper surface side and has a metal shield portion (50) capable of suppressing leakage of noise generated by the power receiving coil, according to any one of claims 1 to 4. The power receiving device described. It is provided with a resin bobbin (32) provided with a groove (32a) for positioning the lead wire of the power receiving coil.
The housing has a resin cover (41) that sandwiches the lead wire between the bobbin and the bobbin.
The power receiving device according to claim 5, wherein the cover is arranged on the power transmission coil side, while the bobbin is arranged on the shield portion side. The power receiving device according to any one of claims 1 to 6, wherein the mounting portion has a vertical dimension such that the dimension between the housing and the lower surface of the vehicle body is 5 mm or more. .. Any of claims 1 to 7, wherein the housing is provided with a guiding portion (42) for guiding the traveling wind of the vehicle in the space formed between the housing and the lower surface of the vehicle body. The power receiving device described in item 1. According to any one of claims 1 to 8, the housing is provided with a closing portion (54) capable of closing the opening of the space formed between the lower surface of the vehicle body and the housing. The power receiving device described.

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