COIL UNIT AND ELECTRIC VEHICLE

• US 20150061593A1
• Filed: 02/01/2013
• Published: 03/05/2015
• Est. Priority Date: 04/17/2012
• Status: Active Grant

• Current Assignee: ENRX IPT GmbH
• Original Assignee: Conductix-Wampfler GmbH (Delachaux Group SA)
• Inventors: Wechlin, Mathias, Green, Andrew, Asselin, Pascal
• Granted Patent: US 9,824,805 B2
• Time in Patent Office: Days
• US Class Current: 320/109
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H01F 3/00 Cores, Yokes, or armatures magnetic materials H01F1/00; permanent magnets H01F7/02
• 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 unit for an electric vehicle for the inductive transfer of electrical energy between the coil unit and a stationary charging station. The coil unit includes at least one coil and a flux guide unit for guiding a magnetic flux occurring during operation of the coil. Also disclosed is an electric vehicle having a coil unit for the inductive transfer of electrical energy between a secondary coil of the coil unit and a primary coil of a charging station. The disclosed coil solves the problem of allowing the safe use of the inductive electrical energy transfer in electric vehicles, in particular motor vehicles, by proposing a coil unit, in which the flux guide unit has material weakenings, and an electric vehicle having such a coil unit.

Claims

1. Coil unit for an electric vehicle for the inductive transfer of electrical energy between the coil unit and a stationary charging station, wherein the coil unit has at least one coil and a flux guide unit for guidance of a magnetic flux appearing during the operation of the coil, wherein the flux guide unit has material weaknesses.

2. Coil unit according to claim 1, wherein the material weaknesses essentially run transverse to the longitudinal direction of the vehicle.

3. Coil unit according to claim 1, wherein the material weaknesses essentially run concentric to a center of the flux guide unit.

4. Coil unit according to claim 1, wherein the material weaknesses essentially run in the direction of the magnetic field lines of the magnetic flux guided in the flux guide unit.

5. Coil unit according to claim 1, wherein the material weaknesses are designed, completely or partially, as predetermined breaking points.

6. Coil unit according to claim 1, wherein the material weaknesses in the flux guide unit are provided grooves.

7. Coil unit according to claim 1, wherein the material weaknesses are provided on different flat sides of the flux guide unit.

8. Coil unit according to claim 1, wherein the material weaknesses are alternatingly provided on the different flat sides of the flux guide unit.

9. Coil unit according to claim 1, wherein the material weaknesses run in a plane of the flux guide unit, parallel to the longitudinal direction of the vehicle, at an incline, preferably, at an incline to plane.

10. Coil unit according to claim 1, wherein the material weaknesses are partial or complete breaks of the flux guide unit.

11. Coil unit according to claim 9, wherein the breaks are, partially or completely, filled with an adhesive and/or bonding material.

12. Coil unit according to claim 11, wherein the adhesive and/or the bonding material has ferromagnetic or ferrimagnetic characteristics.

13. Electric vehicle with a coil unit for the inductive transfer of electrical energy between a secondary coil of the coil unit and a primary coil of a charging station, wherein the coil unit is designed in accordance with claim 1.