Coil Device for a Motor Vehicle, in Particular for a Car

• US 20200135392A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 06/30/2017
• Status: Active Application

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: HELM, Detlef, KRAMMER, Josef, MUELLER-KABEITZ, Tobias
• Application Number:
  US16/728,628
• Publication Number:
  US 20200135392A1
• Time in Patent Office: Days
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: H01F 27/02 Casings
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• 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 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A coil device for a motor vehicle has a housing, at least one secondary coil which is arranged in the housing for inductively transmitting electric energy in order to charge an energy storage unit of the motor vehicle, and a plurality of ferrites, which are arranged in the housing and which are mutually spaced, for conducting at least one magnetic field in order to inductively transmit the electric energy. The ferrites form a flat element and are connected together via at least one elastically deformable connection element such that the ferrites can be moved relative to one another while elastically deforming the connection element.

Claims

1. A coil device for a motor vehicle, comprising:

a housing;

at least one secondary coil which is arranged in the housing and which serves for inductively transmitting electrical energy for purposes of charging an energy store of the motor vehicle; and

a plurality of ferrites which are arranged in the housing and which are spaced apart from one another and serve for conducting at least one magnetic field for inductive transmission of the electrical energy, wherein

the ferrites form an areal element and are connected to one another by at least one elastically deformable connecting element such that the ferrites are movable relative to one another with elastic deformation of the connecting element.

2. The coil device according to claim 1, wherein

the housing is formed from an elastically deformable material.

3. The coil device according to claim 1, wherein

the ferrites are arranged on a surface of the connecting element that faces the ferrites.

4. The coil device according to claim 1, wherein

the connecting element is arranged at least partially between the ferrites.

5. The coil device according to claim 1, wherein

the connecting element is formed as a single piece and/or as a foil.

6. The coil device according to claim 1, wherein

the ferrites are arranged in a matrix in rows running mutually parallel and columns running mutually parallel and in each case perpendicular to the rows.

7. The coil device according to claim 1, wherein

the ferrites are arranged in a stellate manner.

8. The coil device according to claim 1, wherein

the ferrites are of arcuate form on respective mutually facing end sides.

9. The coil device according to claim 8, wherein

a respective first of the end sides has a convex positive contour and a respective second of the end sides, opposite the respective first end side, has a concave negative contour corresponding to the positive contour.

10. The coil device according to claim 1, wherein

the ferrites engage into one another.