# US 11,452,240 B2 · Power transfer apparatus, power transmission apparatus, power reception apparatus, and power transfer system

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- Number: US 11,452,240 B2
- Document ID: US11452240B2
- Status: Granted
- Kind: B2
- Application number: 17/271,846
- Filed: 2019-08-30
- Published: 2021-10-14
- Granted: 2022-09-20
- Earliest claimed: 2018-08-30
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Masato Okabe
- Web page: https://patentgrep.com/patent/US11452240B2

## CPC

- H01F 27/2876: {Cooling (cooling transformers and inductances in general H01F27/08)}
- H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)}
- B60L 53/12: Inductive energy transfer
- B60L 53/302: Cooling of charging equipment
- H01F 27/22: Cooling by heat conduction through solid or powdered fillings
- H01F 38/14: Inductive couplings
- H02J 50/10: using inductive coupling
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 27/366: {made of ferromagnetic material}
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power transfer apparatus capable of effectively cooling heat generated by wireless power transfer includes: a power transmission coil for performing wireless power transfer; and a heat-dissipating plate for cooling the power transmission coil, the heat-dissipating plate including heat-dissipating members or the like which are divided by gaps along the radial direction of a winding plane of a copper thin-film wire constituting the power transmission coil.

## Claims

### Claim 1

A power transfer apparatus, comprising:
coil assembly in which a winding wire is wound a plurality of times, the coil being configured to perform a non-contact type power transfer, the coil assembly including:
a first coil configured to perform power transmission or power reception, as the non-contact type power transfer, the first coil including:
an out-in winding wire wound toward an inner circumference side from an outer circumference side of the first coil; and
an in-out winding wire that is wound in a winding direction opposite to the out-in winding wire toward the outer circumference side from the inner circumference side of the first coil, the out-in winding wire and the in-out winding wire being stacked such that a winding position of the out-in winding wire is coincident with a winding position of the in-out winding wire; and
a second coil stacked on the first coil in which power to be subjected to the power transmission is supplied at a time of the power transmission, and power to be subjected to the power reception is output at a time of the power reception;
a heat release assembly configured to cool the coil assembly and facing a region of the coil assembly excluding a region inside from an innermost circumference of the winding wire and facing a region outside from an outermost circumference of the winding wire, in a plane parallel to a winding surface of the winding wire, the heat release assembly including:
a plurality of metallic heat release members; and
at least one gap that divides the plurality of metallic heat release members along a radial direction of the winding surface;
a shield that is disposed on a side opposite to a power transmission side of the coil assembly at the time of power transmission or a side opposite to a power reception side of the coil assembly at the time of power reception when seen from a position of the coil assembly and the plurality of heat release assembly, and configured to shield an electromagnetic wave generated by the power transfer; and
a magnetic body disposed between the shield and the heat release assembly.

### Claim 2 (depends on 1)

The power transfer apparatus according to claim 1, further comprising:
a thermally conductive resin layer between the coil assembly and the heat release assembly.

### Claim 3 (depends on 1)

The power transfer apparatus according to claim 1,
wherein an area of the shield and the magnetic body in a plane perpendicular to a straight line toward the shield and the magnetic body from the position of the coil assembly is greater than or equal to an area of the coil assembly in the plane.

### Claim 4 (depends on 3)

The power transfer apparatus according to claim 3,
wherein the straight line is a perpendicular line that is erected in a direction toward the shield and the magnetic body with a center of the coil assembly as a foot, and
an area of a surface perpendicular to the perpendicular line of the shield and the magnetic body that are respectively in the shape of a plate is greater than or equal to an area of the winding surface of the winding wire in the coil assembly.

### Claim 5 (depends on 1)

The power transfer apparatus according to claim 1,
wherein in the second coil, a winding wire is wound a plurality of times.

### Claim 6 (depends on 1)

The power transfer apparatus according to claim 1, further comprising:
a second heat release member that is thermally connected to and is electrically insulated from any one of the heat release members, on an outer edge of the heat release member.

### Claim 7 (depends on 1)

A power transmission apparatus provided in a power transfer system that includes the power transmission apparatus and a power reception apparatus separated from the power transmission apparatus, and transfers power to the power reception apparatus from the power transmission apparatus in a non-contact manner, the power transmission apparatus comprising:
the power transfer apparatus according to claim 1; and
an output configured to output power to be transferred to the coil assembly of the power transfer apparatus.

### Claim 8 (depends on 1)

A power reception apparatus provided in a power transfer system that includes a power transmission apparatus and the power reception apparatus separated from the power transmission apparatus, and transfers power to the power reception apparatus from the power transmission apparatus in a non-contact manner, the power reception apparatus comprising:
the power transfer apparatus according to claim 1; and
an input connected to the coil assembly of the power transfer apparatus.

### Claim 9 (depends on 7)

A non-contact type power transfer system, comprising:
the power transmission apparatus according to claim 7; and
a power reception apparatus that is separated from the power transmission apparatus, disposed to face the coil assembly, and configured to receive power transmitted from the power transmission apparatus.

### Claim 10 (depends on 8)

A non-contact type power transfer system, comprising:
a power transmission apparatus; and
the power reception apparatus according to claim 8 that is separated from the power transmission apparatus and configured to receive power transmitted from the power transmission apparatus in which the coil assembly is disposed to face the power transmission apparatus.