Device for the contactless charging of an electrical energy storage means of a motor vehicle

Patent metadata

Field	Value
Publication number	US-2016288656-A1
Application number	US-201615069035-A
Country	US
Kind code	A1
Filing date	Mar 14, 2016
Priority date	Mar 30, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A device ( 1 ) for the contactless charging of an electrical energy storage ( 2 ) of a motor vehicle has at least one primary coil ( 3 ) arranged in a bottom housing ( 4 ) and connected to an electrical power supply. The device ( 1 ) is formed so that alternating current flowing in the primary coil ( 3 ) can generate an alternating magnetic field ( 10 ) to induce an alternating electrical voltage in a secondary coil ( 6 ) on the vehicle that is separated from the primary coil ( 3 ) by an air gap. Thus, a current flow that is variable over time and can be converted by a rectifier means on the vehicle into a direct current for charging the electrical energy storage connected to the rectifier means. The at least one primary coil ( 3 ) is connected to the bottom housing ( 4 ) in such a way to yield mechanically under the effect of an external compressive force.

First claim

What is claimed is:

1 . A device for a contactless charging of an electrical energy storage of a motor vehicle, the motor vehicle further having a secondary coil and a connected to the electrical energy storage, the device comprising:
a bottom housing external of the motor vehicle; at least one primary coil arranged in the bottom housing and being connectable to an electrical power supply system so that an alternating current flowing through the primary coil generates an alternating magnetic field that can induce an alternating electrical voltage in the secondary coil on the vehicle and is separated from the primary coil by an air gap, resulting in a current flow that is variable over time and convertible by the rectifier means on the vehicle into a direct current for charging the electrical energy storage connected to the rectifier; and the at least one primary coil being connected to the bottom housing to yield mechanically in response to an external compressive force.

2 . The device of claim 1 , further comprising at least one compression spring that connects the primary coil to the bottom housing to yield mechanically in response to the external compressive force.

3 . The device of claim 2 , wherein the at least one compression spring extends between a bottom portion of the bottom housing and the primary coil.

4 . The device of claim 2 , wherein the at least one compression spring is a helical spring.

5 . The device of claim 2 , wherein the at least one compression spring is a gas compression spring.

6 . The device of claim 2 , wherein a length of the at least one compression spring is chosen so that, in a relaxed state of the at least one compression spring, the primary coil extends above an upper housing opening of the bottom housing.

7 . The device of claim 6 , wherein the length of the compression spring means is chosen so that, in the relaxed state of the compression spring, the primary coil is kept at a distance from the secondary coil so that an air gap forms between the primary coil and the secondary coil at a lower height level of a height-adjustable chassis of the motor vehicle that has at least two height levels.

8 . The device of claim 2 , wherein the at least one compression spring comprises a plurality of the compression springs.

9 . The device of claim 2 , wherein the bottom housing has an overall height selected so that setting down of the motor vehicle on an upper side of the bottom housing is prevented in the event of sagging of the motor vehicle.

10 . A device for a contactless charging of an electrical energy storage of a motor vehicle, the device comprising:
a bottom housing external of the motor vehicle; at least one primary coil arranged in the bottom housing and being connectable to an electrical power supply system so that an alternating current flowing through the primary coil generates an alternating magnetic field; and at least one compression spring that connects the primary coil to the bottom housing to yield mechanically in response to an external compressive force.

Assignees

• Porsche Ag

Inventors

• Kristof Thomas
• Herke Dirk
• Ueffing Marina

Classifications

• B60L11/182 Primary

  Operations & Transport · mapped topic

• H02J7/00 Primary

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• B60L53/12 Primary

  Inductive energy transfer · CPC title

• Y02T90/12

  Electric charging stations · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title