DE102018009352A1 - Device for inductively charging an electrical energy storage device of a vehicle - Google Patents

Abstract

The invention relates to a device (2) for inductively charging an electrical energy store (3) of a vehicle (1) with a vehicle-side secondary coil (2.2), a vehicle-external primary coil (2.1), wherein the secondary coil (2.2) via an air gap (S) with the primary coil (2.1) is inductively coupled and in the primary coil (2.1) generated magnetic flux (Φ) via the air gap (S) to the secondary coil (2.2) is transferable, and a coupling amplification device (2.3). According to the invention, the secondary coil (2.2) comprises at least two individual coils (2.2.1, 2.2.2) and a multipart coil core (2.2.3), wherein a first core section (2.2.3.1) of the coil core (2.2.3) of a first single coil (2.2 .1), a second core section (2.2.3.2) of the coil core (2.2.3) is associated with a second individual coil (2.2.2), and the coupling reinforcement device (2.3) has a third core section (2.2.3.3) of the coil core (2.2.3.3). 3) which is arranged between the first core section (2.2.3.1) and the second core section (2.2.3.2) and is magnetically coupled to the first core section (2.2.3.1) and the second core section (2.2.3.2). The third core section (2.2.3.3) is displaceable at least essentially in such a way perpendicular to the first core section (2.2.3.1) and the second core section (2.2.3.2), that in each case one for a magnetic flux between the first core section (2.2.3.1) and the third core section (2.2.3.3) and between the second core section (2.2.3.2) and the third core section (2.2.3.3) effective surface is adjustable.

Description

The invention relates to a device for inductively charging an electrical energy store of a vehicle according to the preamble of claim 1.

From the DE 10 2014 015 192 A1 a device for inductive charging of an electrical energy storage device of a motor vehicle with a vehicle-side power receiving device is known, which is inductively coupled with an energy transfer device via an air gap. In the energy transmission device, a generated magnetic flux via the air gap to the vehicle-side power receiving device is transferable. The device comprises a coupling amplifying device, which has a magnetic material and which can be positioned in the air gap between the energy receiving device and the energy transfer device such that the magnetic flux generated by the energy transfer device penetrates the magnetic material of the coupling amplifying device.

Furthermore, from the DE 10 2010 054 909 A1 a motor vehicle device with a charging and discharging unit, which has a vehicle-side power transmission unit for non-contact coupling with a corresponding external power transmission unit for charging and discharging a battery device. The motor vehicle device further comprises a Kraftfahrzeugniveauverstelleinheit, which is intended to set two different vehicle heights. Furthermore, an adjustment unit is provided for setting a distance between the two energy transmission units by means of the motor vehicle level adjustment unit to a charge level for a charging or discharging process.

The invention is based on the object to provide a comparison with the prior art improved device for inductively charging an electrical energy storage of a vehicle.

The object is achieved with a device having the features specified in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The device for inductively charging an electrical energy storage device of a vehicle comprises a vehicle-side secondary coil, a vehicle-external primary coil, wherein the secondary coil is inductively coupled via an air gap with the primary coil and a magnetic flux generated in the primary coil via the air gap to the secondary coil is transferable. Furthermore, the device comprises a coupling amplification device.

According to the invention, the secondary coil comprises at least two individual coils and a multi-part coil core, wherein a first core portion of the coil core is associated with a first single coil and a second core portion of the coil core is associated with a second single coil. The coupling enhancer further includes a third core portion of the spool core disposed between the first core portion and the second core portion and magnetically coupled to the first core portion and the second core portion. In this case, the third core section is displaceable at least substantially perpendicular to the first core section and the second core section such that in each case an area effective for a magnetic flux between the first core section and the third core section and between the second core section and the third core section is adjustable.

In inductive charging, the magnetic coupling of the secondary coil and the primary coil is crucial for energy transfer. The coupling of the secondary coil and the primary coil changes with a changing ground clearance of the vehicle, for example, by payload, discharge or settings of a height-adjustable chassis. Especially at very small distances, too large a magnetic coupling is a problem. By means of the coupling amplifying device, it is possible to realize a change of a magnetic coupling between the secondary coil and the primary coil by geometrically changing the coil core of the secondary coil. In this case, it is possible to selectively increase or reduce the magnetic coupling and thus a deviation of a distance between the secondary coil and the primary coil from a target distance, for example at different loading conditions of the vehicle, or a change in distance during a loading, for example by changing a load state during of the charging process, to compensate

Embodiments of the invention are explained in more detail below with reference to drawings.

• 1 schematisch eine Seitenansicht eines Fahrzeugs und einer Vorrichtung zum induktiven Laden eines elektrischen Energiespeichers des Fahrzeugs in einem beladenen Zustand des Fahrzeugs,
• 2 schematisch eine Seitenansicht des Fahrzeugs und der Vorrichtung gemäß 1 in einem unbeladenen Zustand des Fahrzeugs und
• 3 schematisch eine fahrzeugseitige Sekundärspule mit einem Kühlkreislauf und einer Koppelverstärkungseinrichtung.

Showing:

• 1 FIG. 2 schematically a side view of a vehicle and a device for inductively charging an electrical energy store of the vehicle in a loaded state of the vehicle, FIG.
• 2 schematically a side view of the vehicle and the device according to 1 in an unloaded state of the vehicle and
• 3 schematically a vehicle-side secondary coil with a cooling circuit and a coupling amplification device.

Corresponding parts are provided in all figures with the same reference numerals.

In 1 is a side view of a vehicle 1 and a device 2 for inductive charging of an electrical energy store 3 of the vehicle 1 in a loaded condition of the vehicle 1 shown. 2 shows the vehicle 1 and the device 2 in an unloaded condition.

The device 2 comprises a vehicle-external primary coil which can be coupled to an electrical energy source 2.1 and one with the energy storage 3 electrically coupled vehicle-side secondary coil 2.2 where the secondary coil 2.2 over an air gap S with the primary coil 2.1 is inductively coupled and one in the primary coil 2.1 generated magnetic flux Φ over the air gap S to the secondary coil 2.2 is transferable.

The magnetic coupling of the secondary coil 2.2 and the primary coil 2.1 is crucial for energy transfer, with the magnetic coupling of the secondary coil 2.2 and the primary coil 2.1 itself with a changing ground clearance of the vehicle 1 For example, by loading, unloading or adjusting a height-adjustable landing gear, and a consequent change in a size of the air gap S changes.

In 3 is a schematic representation of a vehicle-side secondary coil 2.2 with a cooling circuit 2.4 shown.

The secondary coil 2.2 is formed in the illustrated embodiment as a so-called double-D energy coil and comprises two individual coils 2.2.1 . 2.2.2 and a three-piece spool core 2.2.3 , in particular a ferrite core. This is a first core section 2.2.3.1 of the spool core 2.2.3 a first single coil 2.2.1 assigned and a second core section 2.2.3.2 of the spool core 2.2.3 a second single coil 2.2.2 assigned.

A third core section 2.2.3.3 of the spool core 2.2.3 is between the first core section 2.2.3.1 and the second core section 2.2.3.2 arranged and with the first core section 2.2.3.1 and the second core section 2.2.3.2 magnetically coupled.

For setting the magnetic coupling of the secondary coil 2.2 and the primary coil 2.1 and thus for adapting the magnetic coupling to a size of the air gap deviating from a nominal value S includes the device 2 a coupling amplification device 2.3 ,

Here is the third core section 2.2.3.3 Component of the coupling amplification device 2.3 , wherein the third core section 2.2.3.3 at least substantially so perpendicular to the first core portion 2.2.3.1 and the second core section 2.2.3.2 , that is horizontally to the coil geometry, is displaceable, that in each case one for a magnetic flux between the first core portion 2.2.3.1 and the third core section 2.2.3.3 and between the second core section 2.2.3.2 and the third core section 2.2.3.3 effective area is adjustable. Thus, a guidance of the magnetic field by changing the coil core 2.2.3 when charging the energy storage 3 to the size of the air gap S between the secondary coil 2.2 and the primary coil 2.1 be adjusted.

In an embodiment not shown, the spool core 2.2.3 designed as a so-called yoke, which the individual coils 2.2.1 . 2.2.2 projects beyond its length and comprises a so-called return yoke, which is designed to adapt the magnetic coupling at least partially displaceable.

For cooling the spool core 2.2.3 this is with a cooling liquid leading a cooling circuit 2.4 thermally coupled, the cooling circuit 2.4 with a hydraulic actuator 2.3.1 which is for shifting the third core portion 2.2.3.3 is mechanically coupled with this. In this case, the actuator includes 2.3.1 For example, a pressure and / or punch, which is formed for example of plastic, so that the adaptation of the magnetic coupling can also be performed during the energy transfer and the device 2 thus can be continuously transferred to an optimal operating point. Due to the design of the actuator 2.3.1 Plastic becomes one of the magnetic fields in the coil core 2.2.3 resulting heating of the same avoided.

For controlling the hydraulic actuator 2.3.1 is in the cooling circuit 2.4 a control valve 2.3.2 , For example, a switchable two-way valve, integrated, by means of which a control of an actuation of the hydraulic actuator 2.3.1 with the cooling liquid is feasible. Here is the control valve 2.3.2 outside the magnetic field of the secondary coil 2.2 positioned to also avoid heating of the same by the magnetic field.

LIST OF REFERENCE NUMBERS

1

vehicle

2

device

2.1

primary coil

2.2

secondary coil

2.2.1

Single coil

2.2.2

Single coil

2.2.3

Plunger

2.2.3.1

core section

2.2.3.2

core section

2.2.3.3

core section

2.3

Coupling amplification device

2.3.1

actuator

2.3.2

control valve

2.4

Cooling circuit

3

energy storage

S

air gap

Φ

magnetic river

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014015192 A1 [0002]
• DE 102010054909 A1 [0003]

Claims (5)

Device (2) for inductively charging an electrical energy store (3) of a vehicle (1) with - a vehicle-side secondary coil (2.2), - a vehicle-external primary coil (2.1), wherein the secondary coil (2.2) via an air gap (S) with the primary coil (2.1) is inductively coupled and in the primary coil (2.1) generated magnetic flux (Φ) via the air gap (S) to the secondary coil (2.2) is transferable, and - a coupling amplification device (2.3), characterized in that - the secondary coil (2.2) comprises at least two individual coils (2.2.1, 2.2.2) and a multipart coil core (2.2.3), - a first core section (2.2.3.1) of the coil core (2.2.3) of a first single coil (2.2.1) a second core section (2.2.3.2) of the coil core (2.2.3) is assigned to a second individual coil (2.2.2), - the coupling amplification device (2.3) has a third core section (2.2.3.3) of the coil core (2.2.3 ), which between the first s core section (2.2.3.1) and the second core section (2.2.3.2) and is magnetically coupled to the first core section (2.2.3.1) and the second core section (2.2.3.2) and - the third core section (2.2.3.3) at least essentially in such a way perpendicular to the first core section (2.2.3.1) and the second core section (2.2.3.2) is displaceable, that in each case one for a magnetic flux between the first core section (2.2.3.1) and the third core section (2.2.3.3) and between the second core section (2.2.3.2) and the third core section (2.2.3.3) effective surface is adjustable. Device (2) according to Claim 1 , characterized in that the coil core (2.2.3) is thermally coupled with a cooling liquid leading a cooling liquid (2.4). Device (2) according to Claim 2 , characterized in that the cooling circuit (2.4) with a hydraulic actuator (2.3.1) can be coupled, which is for coupling the third core section (2.2.3.3) with the third mechanical core section (2.2.3.3) coupled or coupled. Device (2) according to Claim 3 , characterized in that the actuator (2.3.1) comprises a printing and / or drawing punch. Device (2) according to Claim 3 or 4 , characterized in that the cooling circuit (2.4) comprises at least one control valve (2.3.2) for controlling the actuator (2.3.1), wherein the control valve (2.3.2) outside a magnetic field of the secondary coil (2.2) is positioned.

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