WO2022190874A1 - コイルユニット - Google Patents

コイルユニット Download PDF

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Publication number
WO2022190874A1
WO2022190874A1 PCT/JP2022/007452 JP2022007452W WO2022190874A1 WO 2022190874 A1 WO2022190874 A1 WO 2022190874A1 JP 2022007452 W JP2022007452 W JP 2022007452W WO 2022190874 A1 WO2022190874 A1 WO 2022190874A1
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WO
WIPO (PCT)
Prior art keywords
coil
coil unit
heat dissipation
plate
power transmission
Prior art date
Application number
PCT/JP2022/007452
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
晋平 瀧田
英介 高橋
宜久 山口
Original Assignee
株式会社デンソー
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Filing date
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Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2022190874A1 publication Critical patent/WO2022190874A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M7/00—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present disclosure relates to coil units.
  • a coil unit in which a coil is arranged on the coil mounting surface side of a ferrite plate, and a metal plate for heat dissipation of the coil is provided on the back side opposite to the coil mounting surface of the ferrite plate (for example, Japanese Patent Laid-Open No. 2019-9161).
  • a coil unit includes a ferrite plate having a coil mounting surface and a bottom surface located behind the coil mounting surface, and a first coil for transmitting or receiving AC power, the first coil and A first coil having a first surface for facing a different second coil, and a second surface located on the opposite side of the first surface and arranged at a position facing the coil mounting surface; A first heat sink disposed at a position facing the first surface or the second surface, wherein the magnetic flux generated by the first coil when the AC power is transmitted or received causes the first heat sink to a first heat sink having insulation for reducing eddy currents generated.
  • the first surface of the first coil facing the second coil or the second surface located on the opposite side of the first surface has an insulating portion that reduces the generation of eddy current.
  • a heat sink can be arranged. Therefore, it is possible to improve the heat radiation performance of the first coil while reducing or preventing the generation of eddy currents in the first heat radiation plate.
  • FIG. 1 is an explanatory diagram showing the configuration of a contactless power supply system
  • FIG. 2 is an explanatory diagram showing the circuit configuration of the contactless power supply system
  • FIG. 3 is an exploded perspective view showing the internal configuration of the coil unit
  • FIG. 4 is an explanatory diagram showing the shape and arrangement position of the first heat sink in plan view
  • FIG. 5 is an explanatory diagram showing the shape of the first heat sink in another form 1 of the first embodiment
  • FIG. 6 is an explanatory diagram showing the shape of the first heat sink in another form 2 of the first embodiment
  • FIG. 7 is an explanatory diagram showing the shape of the first heat sink in another form 3 of the first embodiment
  • FIG. 8 is an exploded perspective view showing the internal configuration of the coil unit of the second embodiment
  • FIG. 9 is an explanatory diagram showing the configuration of the heat dissipation connection part in another form 1 of the second embodiment
  • FIG. 10 is an explanatory diagram showing the configuration of the heat dissipation connection part in another form 2 of the second embodiment
  • FIG. 11A is an explanatory diagram showing the shape and arrangement position of the heat dissipation connection
  • FIG. 11B is an explanatory diagram showing the configuration of the heat dissipation connection part in another form 3 of the second embodiment
  • FIG. 11C is an explanatory diagram showing the shape of the heat dissipation connection part in another form 3 of the second embodiment
  • FIG. 12 is an explanatory diagram showing the configuration of the heat dissipation connection part in another form 4 of the second embodiment
  • FIG. 13 is an exploded perspective view showing the internal configuration of the coil unit of the third embodiment
  • FIG. 14 is an explanatory diagram showing the configuration of the first heat radiation plate and the heat radiation connection part in another form
  • 15A and 15B are explanatory diagrams showing the arrangement positions of the heat dissipation connection portions of another form of the coil unit.
  • FIG. 1 shows a contactless power supply system 300 including the coil unit 80 of this embodiment.
  • Contactless power supply system 300 includes power transmitter 100 installed on road RS and power receiver 205 mounted on vehicle 200 .
  • Contactless power supply system 300 is a system capable of supplying power from power transmitter 100 to power receiver 205 of vehicle 200 in a contactless manner.
  • the coil unit 80 is provided in the power transmitter 100 .
  • the power transmitter 100 includes a power transmission resonance circuit 110, a power transmission circuit 120, and a power supply circuit .
  • the power transmission resonance circuit 110, the power transmission circuit 120, and the power supply circuit 130 are embedded inside the road RS.
  • a plurality of power transmission resonance circuits 110 and power transmission circuits 120 may be provided, and for example, they may be arranged continuously along the extending direction of the road RS along which the vehicle 200 travels.
  • the power transmission resonance circuit 110, the power transmission circuit 120, and the power supply circuit 130 do not necessarily have to be embedded inside the road RS.
  • Power transmission circuit 120 and power supply circuit 130 are preferably provided near power transmission resonance circuit 110 .
  • the power supply circuit 130 supplies, for example, AC power from an AC power supply such as a system power supply to the power transmission circuit 120 via a power cable.
  • Power transmission circuit 120 is an AC conversion circuit having a rectifier circuit, an inverter circuit, a filter circuit, and the like. Power transmission circuit 120 converts AC power supplied from power supply circuit 130 into DC power, converts the DC power into high-frequency AC power that can be transmitted to power receiver 205 of vehicle 200 , and supplies the high-frequency AC power to power transmission resonance circuit 110 . .
  • the power transmission resonance circuit 110 transmits the AC power induced in the power transmission coil 112 to the power reception resonance circuit 210 using the electromagnetic induction phenomenon.
  • the power transmission resonance circuit 110 is, as shown in FIG. 2, an LC circuit in which a power transmission coil 112 and a first capacitor 116 functioning as a resonance capacitor are connected in series.
  • the power transmission coil 112 and the first capacitor 116 may be connected in parallel.
  • the power transmission coil 112 is included in the coil unit 80 of this embodiment.
  • power transmitting coil 112 functions as a first coil for transmitting AC power to power receiving coil 212 of vehicle 200 .
  • the power receiving coil 212 functions as a second coil.
  • the vehicle 200 is, for example, a vehicle equipped with a drive motor such as an electric vehicle or a hybrid vehicle.
  • Vehicle 200 includes a power receiver 205 and a battery 230, as shown in FIG.
  • the power receiver 205 has a power receiver resonant circuit 210 and a power receiver circuit 220 .
  • the power receiving resonance circuit 210 includes, as shown in FIG. 2, a power receiving coil 212 and a second capacitor 216 functioning as a resonance capacitor.
  • Power receiving resonance circuit 210 is arranged, for example, on the bottom surface of vehicle 200 .
  • the power receiving resonant circuit 210 receives AC power induced in the power transmitting resonant circuit 110 of the power transmitter 100 from the power receiving coil 212 .
  • the power receiving circuit 220 converts the AC power output from the power receiving resonance circuit 210 into DC power.
  • the power receiving circuit 220 includes, for example, a filter circuit, a rectifier circuit that converts AC power into DC power, and a power conversion circuit that converts the AC power into DC power suitable for charging the battery 230 .
  • Battery 230 is, for example, a secondary battery that outputs DC power for driving a drive motor that is a drive source of vehicle 200 .
  • the DC power output from power receiving circuit 220 can be used to charge battery 230 .
  • the DC power from power receiving circuit 220 may be used to charge an auxiliary battery (not shown) or to drive a drive motor or auxiliary equipment.
  • the coil unit 80 includes a substantially rectangular case including an upper surface cover 81 and a lower surface cover 86 provided with a first heat sink 90, a coil substrate 82 including a power transmission coil 112, a ferrite plate 83, a second heat sink 84, A substrate 85 is included.
  • FIG. 1 illustrates the coil unit 80 as including the power transmission resonance circuit 110 and the power transmission circuit 120 of the power transmitter 100 for easy understanding of the technology, the coil unit 80 includes at least power transmission It is sufficient that the coil 112, the ferrite plate 83, and the first radiator plate 90 are included.
  • Coil unit 80 may include, for example, power transmission resonant circuit 110, power transmission circuit 120, and any other members included in power supply circuit 130.
  • the top cover 81 has non-conductivity and is made of a non-magnetic material such as resin.
  • the top cover 81 has a substantially flat plate shape.
  • Top surface 81T of top cover 81 is a surface of coil unit 80 that faces power receiving coil 212 of vehicle 200 (hereinafter also referred to as a “coil facing surface”).
  • the lower surface 81B of the upper surface cover 81 covers the first surface 82T of the coil substrate 82 and protects the coil substrate 82 and the power transmission coil 112 from the outside air.
  • the top cover 81 is embedded in the road RS in this embodiment, it may be exposed from the road RS.
  • a first radiator plate 90 is provided on the top cover 81 .
  • the first radiator plate 90 has a substantially flat plate-like external shape.
  • the first radiator plate 90 is provided at a position facing the first surface 82T of the coil substrate 82 .
  • “the first heat sink 90 faces the first surface 82T or the second surface 82B” means that the first heat sink 90 faces the first surface 82T or the second surface 82B while being in contact with the first surface 82T or the second surface 82B.
  • the first radiator plate 90 is embedded in the top cover 81 by resin molding.
  • the first radiator plate 90 is made of a nonmagnetic and highly thermally conductive material, and radiates heat generated in the power transmission coil 112 . From the viewpoint of reducing or preventing magnetic flux interlinking the first heat radiation plate 90, the first heat radiation plate 90 is preferably made of a material with low magnetic permeability.
  • the first heat sink 90 is made of metal such as aluminum, an aluminum alloy, or copper, for example.
  • the first heat sink 90 may be exposed on the top surface 81T of the top cover 81 .
  • the first heat sink 90 may be exposed from the bottom surface 81B of the top cover 81 as long as it is not electrically connected to the power transmission coil 112 .
  • the first radiator plate 90 may be attached to the upper surface cover 81 by, for example, welding or bonding with an adhesive, in addition to resin molding.
  • the lower surface cover 86 is made of metal such as aluminum, aluminum alloy, or copper, for example.
  • metal such as aluminum, aluminum alloy, or copper
  • the lower surface cover 86 is made of metal such as aluminum, aluminum alloy, or copper, for example.
  • the side surface of the case that accommodates the coil substrate 82, the ferrite plate 83, the second heat sink 84, and the substrate 85 is made of, for example, a metal material such as aluminum, an aluminum alloy, or copper, or a resin material. you can
  • the side surfaces of the case may be made of the same material as the top cover 81 and the bottom cover 86, or may be made of a different material. By using a resin material for the side surface of the case, it is possible to reduce or prevent interruption of the magnetic flux generated from the power transmission coil 112 .
  • the coil substrate 82 is a rigid type printed wiring board.
  • the coil substrate 82 has a substantially rectangular external shape in plan view.
  • a power transmission coil 112 is formed inside the coil substrate 82 .
  • the power transmission coil 112 is a laminated coil formed by laminating a plurality of annular conductors surrounding the central axis CX.
  • the power transmission coil 112 is provided with a hollow region containing no conductor at a position including the central axis CX.
  • the power transmission coil 112 is insulated and not electrically connected to the first heat sink 90 .
  • the power transmitting coil 112 has a first surface 82T as a coil surface facing the power receiving coil 212 when power is supplied to the power receiving coil 212, and a second surface 82B as a coil surface on the opposite side of the first surface 82T.
  • the surface close to the coil facing surface is also called a first surface 82T
  • the surface opposite to the first surface 82T of the coil substrate 82 is also called a second surface 82B.
  • Power transmission coil 112 is not limited to a form provided on a printed wiring board.
  • a conducting wire such as a magnet wire may be used for the power transmission coil 112.
  • the power transmission coil 112 may be formed by resin-molding a coiled magnet wire.
  • the power transmission coil 112 may be, for example, a spiral coil obtained by cutting a conductor into a spiral shape, or may be various coils such as a helical coil in which a conductor having a circular or rectangular cross section is spirally wound. good.
  • the conducting wires may be formed of stranded wires.
  • the ferrite plate 83 has a substantially rectangular external shape in plan view.
  • the ferrite plate 83 has a coil mounting surface 83T for mounting the coil substrate 82, and a bottom surface 83B located on the back side of the coil mounting surface 83T.
  • the coil mounting surface 83T is a surface arranged at a position closer to the coil facing surface than the bottom surface 83B.
  • the ferrite plate 83 is arranged such that the coil mounting surface 83T faces the second surface 82B of the coil substrate 82 .
  • the ferrite plate 83 may be provided in a state separated from the second surface 82B.
  • the ferrite plate 83 may be provided with a through hole for inserting a wiring that electrically connects the power transmission coil 112 and the substrate 85 .
  • the second radiator plate 84 has a substantially rectangular external shape in plan view.
  • the second radiator plate 84 is made of metal such as aluminum, an aluminum alloy, or copper, for example.
  • the second radiator plate 84 has a top surface 84T, which is a surface close to the coil facing surface, and a bottom surface 84B located on the back side of the top surface 84T.
  • the second radiator plate 84 is arranged on the opposite side of the coil substrate 82 with the ferrite plate 83 interposed therebetween.
  • the second radiator plate 84 is arranged at a position where the top surface 84T faces the bottom surface 83B of the ferrite plate 83 .
  • the second radiator plate 84 is provided with the top surface 84T in contact with the bottom surface 83B of the ferrite plate 83 .
  • the top surface 84T may be spaced apart from the bottom surface 83B of the ferrite plate 83.
  • a cooling device using a coolant or the like may be provided between the ferrite plate 83 and the second radiator plate 84.
  • the second radiator plate 84 may be provided with a through-hole for inserting a wiring that electrically connects the power transmission coil 112 and the substrate 85 .
  • the substrate 85 is a wiring substrate arranged at a position facing the lower surface 84B of the second heat sink 84 .
  • the first capacitor 116 included in the power transmission resonance circuit 110, the capacitor 124 of the filter circuit included in the power transmission circuit 120, and the like are mounted on the substrate 85 .
  • the first capacitor 116 may be mounted on the coil substrate 82 .
  • the first capacitor 116 and the substrate 85 may be provided outside the case or arranged outside the coil unit 80 .
  • FIG. 4 shows the power transmission coil 112 and the first heat radiation plate 90 in plan view from the coil facing surface.
  • FIG. 4 schematically shows the power transmission coil 112 and the first radiator plate 90 arranged on the first surface 82T of the power transmission coil 112, and the illustration of other members is omitted.
  • the first radiator plate 90 includes a main body portion 97, an opening portion 98, and an insulating portion 92.
  • the body portion 97 is a substantially flat plate-shaped member made of a nonmagnetic and highly thermally conductive material, and is a portion that dissipates heat generated in the power transmission coil 112 .
  • the body portion 97 has an inner edge 97A surrounding the opening 98 and an outer edge 97B.
  • the opening 98 is a through hole provided in the center of the main body 97 in plan view. As shown in FIG. 4 , opening 98 is arranged to include center axis CX of power transmission coil 112 .
  • the insulating portion 92 functions as an electrical resistance to reduce or prevent eddy currents from flowing through the body portion 97 .
  • an alternating current flows through power transmission coil 112
  • magnetic flux is formed around power transmission coil 112 .
  • the magnetic flux formed around power transmission coil 112 passes through the hollow portion of power transmission coil 112 , ferrite plate 83 , and the outer peripheral side of power transmission coil 112 .
  • alternating current flows through power receiving coil 212 .
  • magnetic flux is also formed around power receiving coil 212 .
  • the power receiving coil 212 receives electric power from the power transmitting coil 112 in a contactless manner due to the magnetic flux that interlinks both the power transmitting coil 112 and the power receiving coil 212 .
  • FIG. 4 schematically shows magnetic flux MX formed in the hollow portion of power transmitting coil 112 when power is supplied to power receiving coil 212 .
  • electromagnetic induction when power is supplied from the power transmitting coil 112 to the power receiving coil 212 causes the magnetic flux MX to move in the direction opposite to the magnetic flux MX as indicated by the arrow EC in FIG.
  • eddy currents that generate magnetic flux of
  • the inductance of the power transmitting coil 112 decreases
  • the coupling coefficient between the power transmitting coil 112 and the power receiving coil 212 decreases, and the power loss increases. power supply characteristics can be degraded.
  • the cutout formed in the body portion 97 functions as the insulating portion 92 .
  • a notch that divides the main body portion 97 from the inner edge 97A to the outer edge 97B functions as the insulating portion 92 .
  • the size and shape of the notch can be arbitrarily set to the extent that the eddy current does not flow through the body portion 97 .
  • the insulating portion 92 functions as an electrical resistance against eddy currents that may annularly flow in the main body portion 97 along the arrow EC, thereby reducing or preventing the occurrence of eddy currents in the main body portion 97 .
  • the insulating portion 92 may be formed of an insulator connecting the inner edge 97A to the outer edge 97B of the main body portion 97 instead of the notch formed in the main body portion 97 .
  • FIG. 4 conceptually shows an example of the magnitude of the magnetic flux density of the magnetic flux formed around the power transmitting coil 112 when power is supplied to the power receiving coil 212 .
  • an example of the magnitude of the magnetic flux density at the broken line MD position including the central axis CX of the power transmission coil 112 is shown.
  • the magnetic flux density increases near the inner peripheral end 112A of the power transmitting coil 112 and near the outer peripheral end 112B of the power transmitting coil 112 .
  • the magnetic flux density is reduced at positions directly above the power transmission coil 112 from the inner peripheral end 112A to the outer peripheral end 112B of the power transmission coil 112, because the eddy current that can flow in the power transmission coil 112 itself, which is a conductor, tends to block the magnetic flux density.
  • the body portion 97 is arranged at a position overlapping the power transmission coil 112 in plan view. Specifically, in plan view, outer edge 97B and inner edge 97A of main body portion 97 are arranged at positions included between inner peripheral end 112A and outer peripheral end 112B of power transmission coil 112 .
  • the first heat sink 90 is arranged at a position directly above the power transmission coil 112 with a low magnetic flux density.
  • the power transmission coil 112 is made of a conductor formed on a printed wiring board, eddy current is more likely to occur in the conductor of the power transmission coil 112 than in a coil made of twisted wires. Therefore, the magnetic flux density directly above the power transmission coil 112 can be made smaller. Therefore, the first radiator plate 90 can be arranged at a position where the magnetic flux density is lower.
  • the first heat radiation plate 90 is arranged at a position facing the first surface 82T, which is the coil facing surface of the power transmission coil 112 .
  • the first heat radiation plate 90 is generated in the first heat radiation plate 90 by the magnetic flux generated by the power transmission coil 112 when AC power is transmitted from the power transmission coil 112 to the power reception coil 212. It has an insulating portion 92 for reducing eddy currents.
  • the coil unit 80 of the present embodiment by improving the heat dissipation performance of the power transmission coil 112 and reducing or preventing the generation of eddy current in the first heat radiation plate 90, the power transmission coil 112 to the power reception coil 212 is reduced. It is possible to reduce or prevent deterioration of power supply characteristics to.
  • the coil unit 80 of this embodiment includes a top cover 81 for covering and protecting the first surface 82T, which is the surface facing the coil.
  • the first heat sink 90 is provided at a position facing the first surface 82T of the top cover 81 . Therefore, the first heat radiation plate 90 absorbs the heat generated in the power transmission coil 112, and radiates heat from the coil facing surface to the space between the power transmission coil 112 and the power reception coil 212, such as the outside of the road RS. can do.
  • the first radiator plate 90 includes the opening 98 and the main body 97 surrounding the opening 98 .
  • the insulating portion 92 is a notch that divides from an inner edge 97A of the body portion 97 surrounding the opening 98 to an outer edge 97B of the body portion 97 . Therefore, the electrical resistance of the insulating portion 92 can be increased while simplifying the structure of the first heat radiation plate 90 as compared with a configuration in which the first heat radiation plate 90 is provided with an insulator.
  • the opening 98 is arranged on the central axis CX of the power transmission coil 112, and the main body 97 is arranged at a position overlapping the power transmission coil 112 in plan view.
  • the first radiator plate 90 contains a material with low magnetic permeability. Therefore, the magnetic flux interlinking with the first heat sink 90 can be further reduced or prevented.
  • FIG. 5 illustrates the first radiator plate 90b included in the coil unit 80 as another form 1 of the first embodiment.
  • the first heat sinks 90b, 90c, and 90d are schematically shown in plan view from the coil-facing surface.
  • the shape of the first heat sink 90b is different from that of the first heat sink 90 shown in the first embodiment.
  • Other configurations of the coil unit 80 are the same as those of the coil unit 80 of the first embodiment.
  • the first radiator plate 90b has four insulating portions 92.
  • the main body portion 97 is divided into four regions by providing four insulating portions 92 as notches that divide the inner edge 97A to the outer edge 97B of the first heat sink plate 90b.
  • Each main body portion 97 divided by the insulating portion 92 is also called a "main body forming portion".
  • the body portion 97 includes body forming portions 901-904.
  • the coil unit 80 of the present embodiment four insulating portions 92 are provided, and the first radiator plate 90b is divided into a plurality of body forming portions 901-904. Therefore, by providing a plurality of insulating portions 92, it is possible to further reduce the eddy current flowing along the direction of generating the magnetic flux opposite to the magnetic flux MX in the first radiator plate 90b.
  • FIG. 6 illustrates a first radiator plate 90c included in a coil unit 80 as another form 2 of the first embodiment.
  • the first heat sink 90c is provided with a larger number of insulating portions 92 than the first heat sink 90b described above.
  • 18 insulating portions 92 are provided and 18 body forming portions 905 are provided.
  • the number of insulating parts 92 may be one as shown in the first embodiment, or may be any number of two or more.
  • each main body forming portion 905 has a substantially square external shape in plan view.
  • the shape of the body forming portion 905 can be any shape.
  • the main body forming portion 905 preferably has a shape such as a shape in which the distance from the inner edge 97A to the outer edge 97B is small, for example. is preferably a shape that sufficiently reduces or prevents the
  • FIG. 7 illustrates a first radiator plate 90d included in a coil unit 80 as another form 3 of the first embodiment.
  • the first radiator plate 90d has more insulating portions 92 and body forming portions 906 than the first radiator plate 90c described above.
  • two types of cutouts formed in the body portion 97 function as the insulating portion 92 .
  • the first notch 92A that divides the inner edge 97A to the outer edge 97B of the first heat sink 90d intersects with the first notch 92A, It has a second notch 92B that divides from one outer edge 97B to the other outer edge 97B.
  • the insulating portions 92 may be set in any shape, number, and arrangement, and the body forming portions 906 may be set in any shape, number, and arrangement.
  • the coil unit 80b of the second embodiment differs from the coil unit 80 of the first embodiment in that the arrangement position of the first heat sink 90 is different and that a heat dissipation connection portion 94 is further provided. are different.
  • the coil unit 80b has a top cover 81b instead of the top cover 81, a coil substrate 82b instead of the coil substrate 82, and a ferrite plate 83b instead of the ferrite plate 83, in the coil unit of the first embodiment. 80 is different.
  • Other configurations of the coil unit 80b are the same as those of the coil unit 80 of the first embodiment.
  • the first heat sink 90 is provided at a position facing the first surface 82T of the coil substrate 82, as in the first embodiment.
  • the first heat sink 90 is embedded in the top cover 81 by resin molding. It is arranged between the substrate 82 .
  • the shape and arrangement position of the first heat sink 90 are the same as those of the first heat sink 90 in the first embodiment.
  • the top cover 81b is different from the top cover 81 of the first embodiment in that it does not have the first heat sink 90, and the rest of the structure is the same as the top cover 81.
  • the first heat radiation plate 90 having the heat radiation connection portion 94 has the upper surface cover 81b, as in the first embodiment, from the viewpoint of facilitating the radiation of the heat of the power transmission coil 112 from the coil facing surface to the outside of the coil unit 80b. You can prepare for
  • the coil substrate 82b has a through hole 822 for inserting the heat dissipation connection portion 94.
  • Other configurations of the coil substrate 82b are the same as those of the coil substrate 82 in the first embodiment.
  • the through hole 822 is provided within the area of the coil substrate 82 where the power transmission coil 112 is arranged.
  • An insulator (not shown) is provided around the through-hole 822 to prevent electrical connection between the heat dissipation connection portion 94 and the power transmission coil 112 .
  • the through-holes 822 may be arranged at various positions within the region where the power transmission coil 112 is arranged so as to avoid contact with the conductor of the power transmission coil 112 .
  • the through hole 822 is formed from the viewpoint of avoiding electrical connection between the heat dissipation connection portion 94 and the power transmission coil 112. 112 conductors.
  • the power transmitting coil 112 may have a bent shape to avoid the through hole 822 . Further, for example, when sufficient power transmission efficiency is obtained from the power transmission coil 112 to the power reception coil 212, the through hole 822 may be provided outside the area where the power transmission coil 112 is arranged.
  • the ferrite plate 83b has a through-hole 832 for inserting the heat dissipation connection portion 94.
  • the position and size of the through hole 832 are preferably set so as not to block the magnetic flux passing through the ferrite plate 83b.
  • Other configurations of the ferrite plate 83b are the same as those of the ferrite plate 83 in the first embodiment.
  • the heat dissipation connection part 94 is made of a non-magnetic and highly thermally conductive material.
  • the heat dissipation connection part 94 is made of the same material as the first heat dissipation plate 90 .
  • the heat dissipation connection portion 94 is made of a metal such as aluminum, an aluminum alloy, or copper. From the viewpoint of reducing or preventing the magnetic flux interlinking the heat dissipation connection part 94 and the first heat dissipation plate 90, the heat dissipation connection part 94 is preferably made of a material with low magnetic permeability.
  • the heat dissipation connection part 94 and the first heat dissipation plate 90 may be integrally formed in the manufacturing process of the first heat dissipation plate 90, for example.
  • the heat dissipation connection part 94 is a substantially cylindrical long member.
  • the longitudinal direction of the heat dissipation connection portion 94 matches the stacking direction of the coil substrate 82b, the ferrite plate 83b, and the second heat dissipation plate 84 in the coil unit 80b.
  • the heat dissipation connection part 94 connects the first heat dissipation plate 90 and the second heat dissipation plate 84 .
  • the heat dissipation connection portion 94 is inserted through the through holes 822 and 832 and connected to the contacts 842 on the upper surface 84T of the second heat dissipation plate 84 .
  • the heat dissipation connection part 94 can have any shape that connects the first heat dissipation plate 90 and the second heat dissipation plate 84 .
  • the shape of the heat dissipation connection portion 94 may be a polygonal prism such as a square prism or a hexagonal prism, in addition to the cylindrical shape.
  • the shape of the heat dissipation connection portion 94 is not limited to a columnar shape, and may be a polyhedron such as a rectangular parallelepiped or a cube, or a plate shape.
  • the shape of the heat dissipation connection portion 94 is such that, for example, the heat dissipation connection portion 94 does not pass through the through-holes 822 and 832, bypasses the coil substrate 82b and the ferrite plate 83b from the outside, and passes through the coil substrate 82b and the ferrite plate 83b.
  • the first heat sink 90 and the second heat sink 84 may be connected by avoiding contact with 83b.
  • the heat dissipation connection part 94 transfers heat between the first heat dissipation plate 90 and the second heat dissipation plate 84 .
  • the heat generated in the power transmission coil 112 is absorbed by the first radiator plate 90 .
  • the heat of the first heat sink 90 is radiated to the second heat sink 84 via the heat sink connection portion 94 .
  • the heat transferred to the second radiator plate 84 is radiated outside the coil unit 80b via the lower surface cover 86 .
  • the heat dissipation connection part 94 is set to radiate the heat of the second heat dissipation plate 84 to the first heat dissipation plate 90 . good too.
  • the coil unit 80b of the present embodiment further includes the heat radiation connecting portion 94 that connects the first heat radiation plate 90 and the second heat radiation plate 84 together. Therefore, it is possible to increase the number of heat dissipation paths for heat generated in the power transmission coil 112 in the coil unit 80b, and to improve the heat dissipation performance in the coil unit 80b.
  • FIG. 9 illustrates a heat dissipation connection portion 94b provided in a coil unit 80b as another form 2 of the second embodiment.
  • the first heat sinks 90b, 90c, and 90d are schematically shown in plan view from the coil substrate 82b, unlike FIG. 5 and the like.
  • the shape and the like of the first heat radiation plate 90b shown in FIG. 9 are the same as those of the above-described first heat radiation plate 90b, so the description thereof is omitted.
  • Other configurations of the coil unit 80b are the same as those of the coil unit 80b of the second embodiment.
  • each of the plurality of main body forming portions 901 to 904 is provided with one heat dissipation connection portion 94b.
  • the shape of the heat dissipation connection part 94b is a flat plate shape, and the surface direction thereof is arranged along the stacking direction of the coil substrate 82b, the ferrite plate 83b, and the second heat dissipation plate 84 in the coil unit 80b.
  • each of the plurality of body forming portions 901 to 904 is provided with the heat dissipation connection portion 94b, so that heat dissipation paths for heat generated in the power transmission coil 112 in the coil unit 80b can be further increased. It is possible to further improve the heat dissipation performance in the coil unit 80b.
  • one main body forming portion has one heat dissipation connection portion 94b, so that each of the main body forming portions 901 to 904 is connected to the second heat dissipation plate 84 via the heat dissipation connection portion 94b.
  • FIG. 10 shows an example of the heat dissipation connection portion 94c.
  • the shape and the like of the first heat sink 90c shown in FIG. 10 are the same as those of the first heat sink 90c described above, so description thereof will be omitted.
  • each of the plurality of main body forming portions 905 is provided with one heat dissipation connection portion 94c.
  • the shape of each of the heat dissipation connection portions 94c is flat and matched with each other.
  • Each of the heat dissipation connection portions 94c has an elongated shape along the stacking direction in the coil unit 80b to the extent that the first heat dissipation plate 90b and the second heat dissipation plate 84 can be connected.
  • each of the heat dissipation connection portions 94 c is arranged in such a direction that the plane direction thereof is radial around the central axis CX of the power transmission coil 112 .
  • each of the heat dissipation connection portions 94c is parallel to the direction in which the magnetic flux generated from the power transmission coil 112 interlinks with the heat dissipation connection portions 94c.
  • the shape of the heat dissipation connection portion 94c is not limited to a flat plate shape, and may be a polygonal prism such as a cube, a cylinder, a quadrangular prism, or a hexagonal prism. good.
  • the shapes of the heat dissipation connection portions 94c provided in the plurality of main body forming portions 905 do not necessarily have to match each other, and may be different shapes.
  • FIG. 11A shows an enlarged view of one main body forming portion 905A among the plurality of main body forming portions 905 included in the first radiator plate 90c shown in FIG.
  • FIG. 11A shows the direction D1 of the magnetic flux generated on the second surface 82B side of the power transmission coil 112 among the magnetic fluxes generated around the power transmission coil 112 when power is supplied from the power transmission coil 112 to the power reception coil 212, and the plate-shaped heat dissipation device.
  • a surface direction SD of the connecting portion 94c is conceptually shown.
  • a heat dissipation connection portion 94R as a comparative example is further indicated by a dashed line.
  • the heat dissipation connection portion 94R is arranged such that its planar direction SDR is perpendicular to the magnetic flux direction D1.
  • Heat dissipation connection portion 94 ⁇ /b>R can block the magnetic flux generated from power transmission coil 112 because its surface direction is perpendicular to direction D ⁇ b>1 of the magnetic flux. Therefore, the heat dissipation connection portion 94R may reduce power transmission performance from the power transmission coil 112 to the power reception coil 212 .
  • each of the plurality of heat dissipation connection portions 94c is arranged so that the surface direction SD of the heat dissipation connection portion 94c and the direction D1 of the magnetic flux are parallel to each other.
  • 94R it is possible to reduce or suppress blocking of the magnetic flux generated by the power transmission coil 112 by the first radiator plate 90c. Therefore, according to the coil unit 80b of the present embodiment, it is possible to reduce or prevent deterioration of power transmission performance from the power transmitting coil 112 to the power receiving coil 212.
  • the center 905CT of the body forming portion 905 is shown in FIG. 11A.
  • the center 905CT means the center of the shape of the main body forming portion 905 in plan view.
  • the center 905CT may be set at the center of gravity of the shape of the body forming portion 905, for example.
  • the heat dissipation connection portion 94c is arranged in the center of each of the plurality of main body forming portions 905. As shown in FIG. Therefore, the heat radiation connecting portion 94c can efficiently absorb the heat of the main body forming portion 905, and can reduce or prevent variations in heat in the main body forming portion 905.
  • the heat radiation connecting portion 94c is not limited to the center of the main body forming portion 905, and may be arranged at a position where the heat of the main body forming portion 905 can be efficiently absorbed in light of the shape of the main body forming portion 905 and the like.
  • FIG. 11B Alternative form 3 of the second embodiment: 11B and 11C, a heat dissipation connection portion 940 provided in a coil unit 80b as another form 3 of the second embodiment will be described.
  • the heat dissipation connection portion 940 is different in shape from the heat dissipation connection portion 94 exemplified in the second embodiment, and the rest of the configuration is the same as the heat dissipation connection portion 94 .
  • the heat dissipation connection portion 940 includes a first connection portion 943 , a second connection portion 946 and an intermediate connection portion 944 .
  • the through hole 822 provided in the coil substrate 82b has a shape corresponding to the shape of the first connection portion 943
  • the through hole 832 provided in the ferrite plate 83b has a shape corresponding to the shape of the second connection portion 946. It has a shape corresponding to the shape.
  • the heat dissipation connection portion 940 is formed by connecting a first connection portion 943, a second connection portion 946, and an intermediate connection portion 944 to each other.
  • the first connection portion 943, the second connection portion 946, and the intermediate connection portion 944 may be connected, for example, by welding, and are made of a metal with high thermal conductivity such as copper or aluminum, or a heat conductive material such as alumina or aluminum nitride.
  • the connection may be made by adhesion using an adhesive or the like to which ceramics with a high modulus is added as a filler.
  • the heat dissipation connection portion 940 may be integrally formed by molding or the like.
  • the shape of each portion of the first connection portion 943, the second connection portion 946, and the intermediate connection portion 944 may be changed by cutting a metal. may be formed.
  • the first connection portion 943 is a portion of the heat radiation connection portion 940 that is arranged in the through hole 822 of the coil substrate 82b.
  • the first connection portion 943 has a substantially flat plate-like external shape.
  • the first connection portion 943 is arranged in a region of the coil substrate 82 where the power transmission coil 112 is arranged.
  • the cross section perpendicular to the winding direction of the conductor in the power transmission coil 112 that is, the width direction of the conductor of the power transmission coil 112 becomes smaller by the cross-sectional integral of the first connection portion 943, and the electrical resistance of the power transmission coil 112 may increase.
  • first connection portion 943 is arranged in the through hole 822 such that the plane direction thereof is parallel to the winding direction of the power transmission coil 112 .
  • first connection portion 943 is arranged such that the cross-sectional area of first connection portion 943 corresponding to the width direction of power transmission coil 112 is the smallest in the region where power transmission coil 112 is arranged.
  • the second connection portion 946 is a portion of the heat dissipation connection portion 940 that is arranged in the through hole 832 of the ferrite plate 83b.
  • the second connection portion 946 has a substantially flat plate-like external shape.
  • the second connection portion 946 is arranged such that its surface direction is parallel to the direction of the magnetic flux generated around the power transmission coil 112 . By configuring in this way, it is possible to reduce or suppress blocking of the magnetic flux generated by the power transmission coil 112 by the second connection portion 946 .
  • the intermediate connection portion 944 is a member having a substantially flat plate-like external shape.
  • the intermediate connection portion 944 is arranged between the coil substrate 82b and the ferrite plate 83b so that the plane direction thereof is parallel to the plane directions of the coil substrate 82b and the ferrite plate 83b.
  • the intermediate connection portion 944 is used to connect the first connection portion 943 and the second connection portion 946 .
  • the intermediate connection portion 944 may be omitted.
  • the heat dissipation connection portion 940 provided in the coil unit 80b of the present embodiment has a shape in which the surface direction thereof is parallel to the winding direction of the power transmission coil 112 in the through hole 822, and In the through hole 832 of the ferrite plate 83b, the plane direction and the magnetic flux direction are parallel to each other.
  • the coil unit 80b of this form while obtaining the heat dissipation performance of the heat dissipation connection part 940, it is possible to reduce or prevent an increase in the electrical resistance of the power transmission coil 112 at the position where the heat dissipation connection part 940 is arranged, It is possible to reduce or prevent the magnetic flux generated around the coil 112 from being cut off by the heat dissipation connection portion 940, and reduce or prevent a decrease in the efficiency of power transmission from the power transmitting coil 112 to the power receiving coil 212. .
  • FIG. 12 illustrates a heat dissipation connection portion 94d provided in a coil unit 80b as another form 4 of the second embodiment.
  • the configuration of the first heat sink 90d shown in FIG. 12 is the same as that of the first heat sink 90d described above, so description thereof will be omitted.
  • each of the plurality of first heat radiation plates 90d is provided with a heat radiation connection portion 94d.
  • the heat dissipation connection portion 94d is arranged in the center of each of the first heat dissipation plates 90d.
  • the heat dissipation connection portion 94d may be provided for each first heat dissipation plate 90d, or may be provided only for one main body forming portion 906 out of the plurality of main body forming portions 906. FIG. In this manner, the shape, number, and arrangement of the heat dissipation connection portions 94d may be arbitrarily set according to the shape, number, and arrangement of the first heat dissipation plate 90d.
  • the coil unit 80c of the third embodiment includes a first heat sink 90e instead of the first heat sink 90, and a ferrite plate 83c instead of the ferrite plate 83, It differs from the coil unit 80 of the first embodiment.
  • Other configurations of the coil unit 80c are the same as those of the coil unit 80 of the first embodiment.
  • the ferrite plate 83c is different from the ferrite plate 83 of the first embodiment in that it includes a first heat sink 90e, and is otherwise the same as the ferrite plate 83 of the first embodiment.
  • the first heat sink 90 is embedded in the top cover 81 by resin molding.
  • the present embodiment differs from the first embodiment in that the first heat radiation plate 90e is provided on the ferrite plate 83c. Further, in the first embodiment, an example in which the first heat radiation plate 90 is provided at a position facing the first surface 82T of the coil substrate 82 is shown. On the other hand, in this embodiment, as shown in FIG. 13, the first heat sink 90e is provided at a position facing the second surface 82B of the coil substrate 82, which is different from the first embodiment. do.
  • the body portion 97 of the first heat radiation plate 90e includes four body forming portions 907.
  • Each of the body forming portions 907 is fitted in a through hole of the ferrite plate 83c, and is arranged from the coil mounting surface 83T of the ferrite plate 83c to the bottom surface 83B.
  • the main body forming portion 907 is in contact with the second heat sink 84 at a contact point 843 on the upper surface 84T of the second heat sink 84 . Thereby, the main body forming portion 907 transfers the heat generated in the power transmission coil 112 to the second heat radiation plate 84 .
  • the heat of the second radiator plate 84 is radiated to the outside through the lower surface cover 86 .
  • the four main body forming portions 907 are arranged apart from each other.
  • the body forming portions 907 are separated from each other, so that the ferrite plate 83c between the body forming portions 907 functions as the insulating portion 92 .
  • the main body forming portion 907 is set to have a size and an arrangement that can avoid interruption of the magnetic flux generated by the power transmission coil 112 and passing through the ferrite plate 83c.
  • each of the main body forming portions 907 is arranged at a position overlapping the power transmission coil 112 in plan view. It is preferable that the main body forming portion 907 have a shape along the direction of the magnetic flux generated from the power transmission coil 112 .
  • the plurality of main body forming portions 907 of the first radiator plate 90e are provided at positions facing the bottom surface 83B of the ferrite plate 83c. Therefore, the heat generated from the power transmission coil 112 can be directly radiated to the second radiator plate 84, and the heat radiation performance to the opposite side of the coil facing surface of the coil unit 80c can be improved.
  • the plurality of heat dissipation connection portions 94 be arranged at positions close to each other. By arranging in this way, while the heat radiation performance of the coil unit 80b is improved by the plurality of heat radiation connecting portions 94, the magnetic flux generated in the power transmission coil 112 when power is supplied between the power transmission coil 112 and the power reception coil 212 heats the first heat radiation plate 90. eddy currents that can occur in
  • FIG. 14 shows an example in which the first heat radiation plate 90 has two heat radiation connection portions 941 and 942, namely a first heat radiation connection portion 941 and a second heat radiation connection portion 942 .
  • FIG. 14 shows an end portion 97E1 of the body portion 97 facing the insulating portion 92, which is a notch, and an end portion 97E2 opposite to the end portion 97E1 with the insulating portion 92 interposed therebetween.
  • the first heat dissipation connection portion 941 and the second heat dissipation connection portion 942 are arranged so as to be close to each other at the end portion 97E1 of the body portion 97 .
  • the closed circuit formed by the first heat dissipation plate 90, the second heat dissipation plate 84, and the heat dissipation connection portion 94 can be formed while improving the heat dissipation performance of the first heat dissipation plate 90 by the plurality of heat dissipation connection portions 941 and 942. It is possible to reduce the eddy current that can be generated in the first heat radiation plate 90 .
  • the first heat sink 90 is provided at a position facing the first surface 82T of the coil substrate 82
  • the first heat sink 90e is a ferrite plate.
  • An example provided in 83c is shown.
  • the first radiator plate 90 may be provided between the second surface 82B of the coil substrate 82 and the coil mounting surface 83T of the ferrite plate 83b.
  • the configuration of the coil unit 80d shown in FIG. 15 differs from the configuration of the coil unit 80b of the second embodiment in that the arrangement position of the first heat sink 90, the shape of the through hole 832, and the shape of the through hole 822 are different. is not provided, and the rest of the configuration is the same as the coil unit 80b of the second embodiment.
  • the through hole 832 has a shape corresponding to the shape of the heat dissipation connection portion 94c.
  • the first radiator plate 90 is arranged at a position facing the second surface 82B of the coil substrate 82 .
  • the main body portion 97 of the first heat sink 90 is arranged at a position overlapping the power transmission coil 112 in plan view.
  • the first radiator plate 90 is arranged at a position directly below the power transmission coil 112 having a low magnetic flux density.
  • the first heat radiation plate 90 can be arranged at a position where the magnetic flux density is lower even at the position facing the second surface 82B of the coil substrate 82 .
  • the first heat dissipation plate 90 has a heat dissipation connection portion 94c.
  • the heat dissipation connection portion 94c has the same shape as the heat dissipation connection portion 94c described above, and is arranged in the through hole 832 of the ferrite plate 83b such that the surface direction thereof is parallel to the direction of the magnetic flux generated from the power transmission coil 112. are placed in By configuring in this way, it is possible to reduce or prevent the magnetic flux generated from the power transmission coil 112 from being cut off by the heat dissipation connection portion 94c.
  • the first radiator plate 90 is provided between the second surface 82B of the coil substrate 82 and the coil mounting surface 83T of the ferrite plate 83b. Therefore, the heat generated from the coil substrate 82 can be easily transferred to the second radiator plate 84, and the heat radiation performance to the opposite side of the coil facing surface of the coil unit 80d can be improved.

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  • Engineering & Computer Science (AREA)
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  • Transportation (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transformer Cooling (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
PCT/JP2022/007452 2021-03-10 2022-02-24 コイルユニット WO2022190874A1 (ja)

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WO2020045661A1 (ja) * 2018-08-30 2020-03-05 大日本印刷株式会社 電力伝送装置、送電装置及び受電装置並びに電力伝送システム

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KR101629653B1 (ko) 2015-04-02 2016-06-13 주식회사 아모그린텍 무선 충전용 방열유닛 및 이를 포함하는 무선전력 충전모듈
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WO2020045661A1 (ja) * 2018-08-30 2020-03-05 大日本印刷株式会社 電力伝送装置、送電装置及び受電装置並びに電力伝送システム

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WO2024185606A1 (ja) * 2023-03-08 2024-09-12 株式会社デンソー コイルユニット

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