Contactless power receiving device

• US 10,658,879 B2
• Filed: 05/25/2016
• Issued: 05/19/2020
• Est. Priority Date: 05/25/2016
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Asai, Akihiro
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Barnett, Joel
• Application Number:
  US16/303,751
• Publication Number:
  US 20190341817A1
• Time in Patent Office: 1,455 Days
• Field of Search: None
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 5/00 Current collectors for power supply lines of electrically-propelled vehicles current collectors in general H01R41/00
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60Y 2200/91 Electric vehicles
• CPC Class Codes: B60Y 2300/91 Battery charging
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A contactless power receiving device includes: a power reception coil unit including a power reception coil configured to contactlessly receive magnetic flux sent from a power supply coil; iron bolts fixing the power reception coil unit to a vehicle body; and a magnetic shield plate configured to suppress diffusion of the magnetic flux received by the power reception coil unit to surroundings. The magnetic shield plate is arranged below all of the iron bolts.

Claims

1. A contactless power receiving device comprising:

a power reception coil unit including a power reception coil configured to contactlessly receive magnetic flux sent from a power supply coil;

iron bolts fixing the power reception coil unit to a vehicle body; and

a magnetic shield plate configured to suppress diffusion of the magnetic flux received by the power reception coil unit to surroundings;

wherein

the magnetic shield plate is arranged below all of the iron bolts at least while the power reception coil unit receives the magnetic flux from the power supply coil.

2. The contactless power receiving device according to claim 1, wherein

the magnetic shield plate includes:

a shield plate main body; and

bolt shield portions arranged in ends of the shield plate main body and configured to shield against the magnetic flux flowing toward the iron bolts, and

the bolt shield portions are arranged only below all of the iron bolts.

3. The contactless power receiving device according to claim 2, wherein each of the bolt shield portions is a tongue piece protruding from a peripheral edge of the shield plate main body and a gap is formed between a side of the tongue piece and the power reception coil unit.

4. The contactless power receiving device according to claim 1, wherein the iron bolts are arranged in a front portion and a rear portion of the power reception coil unit mounted on a vehicle.

5. The contactless power receiving device according to claim 1, wherein a portion of the magnetic shield plate arranged below each of the iron bolts is arranged at a height position above a lower surface of the power reception coil unit.

6. The contactless power receiving device according to claim 1, wherein a length relationship of L1<

L2 is established, where L1 is a height from a portion of the magnetic shield plate arranged below each of the iron bolts to the vehicle body to which the iron bolts are fixed and L2 is an overall length of each of the iron bolts.

7. The contactless power receiving device according to claim 1, wherein the magnetic shield plate is not arranged below the power reception coil while the magnetic shield plate is arranged below all of the iron bolts.

8. The contactless power receiving device according to claim 1, wherein the magnetic shield plate has an opening from which the power reception coil unit is exposed.