DE102017011388A1 - Charging device for a motor vehicle, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to a charging device (10) for a motor vehicle, comprising at least one secondary coil unit (12) which has at least one secondary coil (14) to which electrical energy provided by at least one primary coil is inductively transferable to form a device for storing electrical energy To store energy storage with the inductively transmitted electrical energy, and with at least one in at least partial coverage with the secondary coil unit (12) arranged Abschirmelement (16) for shielding and / or guiding a magnetic field, wherein the shielding element (16) with cooling fins (26) for Cooling of the secondary coil unit (12) is provided.

Description

The invention relates to a charging device for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1.

Such a charging device for a motor vehicle, in particular for a motor vehicle such as a passenger car, for example, is already the DE 10 2014 018 754 A1 to be known as known. The charging device comprises at least one secondary coil unit, which has at least one secondary coil for the motor vehicle. On the secondary coil provided by at least one primary coil electrical energy is inductively transferable to thereby load a formed for storing electrical energy storage energy with the inductively transmitted electrical energy. This means that the electrical energy transmitted inductively from the primary coil to the secondary coil can be transferred from the secondary coil to the energy store and stored in the energy store. This loads the energy storage. The charging device further comprises at least one in at least partial overlap with the secondary coil unit, in particular with the secondary coil, arranged shielding for shielding or guiding a magnetic field.

Object of the present invention is to develop a charging device of the type mentioned in such a way that a particularly advantageous operation can be realized in a space-saving manner.

This object is achieved by a charging device having the features of patent claim 1. Advantageous embodiments with expedient developments of the invention are specified in the remaining claims.

In order to develop a charging device specified in the preamble of claim 1 type such that a particularly advantageous operation in a particularly space-saving manner can be realized, it is inventively provided that the shield is provided with cooling fins for cooling the secondary coil unit. This means that the shielding element and the cooling ribs form an assembly in the form of a shielding and cooling module, by means of which the secondary coil unit, in particular the secondary coil, are cooled and, for example, a magnetic field by means of which the electrical energy can be transmitted inductively from the primary coil to the secondary coil or is transmitted, can be managed as required and / or shielded.

The cooling of the secondary coil unit, in particular the secondary coil, by means of the shielding and cooling module takes place in particular by an air cooling, in the context of which air or an air flow to the cooling fins and flows around. By using the cooling fins, a particularly large surface area can be created, via which a particularly advantageous heat transfer from the secondary coil unit to the air can take place. The air is conveyed for example by means of a fan or blower of the motor vehicle, whereby the air flows around and around the cooling fins. In particular, a particularly advantageous heat transfer from the secondary coil via a secondary coil housing of the secondary coil unit to the cooling fins and from this to the air, so that a particularly effective and efficient cooling can be displayed.

• - Realisierung eines sehr guten Wirkungsgrads für die induktive Energieübertragung
• - Bauelementen wie beispielsweise Stahlträger des Kraftfahrzeugs sollten gegen das Magnetfeld abgeschirmt werden, um Induktions- und Wirbelstromeffekte und daraus resultierende Erhitzungen zu vermeiden
• - insbesondere während der induktiven Energieübertragung sollte die fahrzeugseitige Komponente gekühlt werden, um eine übermäßige Erwärmung der Sekundärspuleneinheit zu vermeiden und somit eine effiziente und effektive, induktive Energieübertragung zu ermöglichen.

The invention is based in particular on the following finding: The secondary coil unit is a vehicle-side component, by means of which an inductive charging system for inductive charging of the energy store can be realized with electrical energy. Inter alia, the following requirements apply to this vehicle-side component or to its integration into the motor vehicle:

• - Realization of a very good efficiency for the inductive energy transfer
• - Components such as steel beams of the motor vehicle should be shielded from the magnetic field to prevent induction and eddy current effects and resulting heating
• - Especially during the inductive energy transfer, the vehicle-mounted component should be cooled in order to avoid excessive heating of the secondary coil unit, thus enabling an efficient and effective, inductive energy transfer.

By means of the charging device according to the invention, all three requirements can be met in a simple manner and thus space and cost, since all three functions are integrated into the shield. On the one hand, the shielding element is used to protect components such as steel beams of the motor vehicle from the magnetic field. For this purpose, the magnetic field is shielded by means of the shielding element or guided accordingly. Furthermore, the shielding element, by being provided with the cooling fins, enables a particularly advantageous cooling of the secondary coil unit and thus, in particular, of the secondary coil. As a result, a particularly efficient inductive energy transfer can be ensured.

In order to realize an advantageous thermal coupling or connection between the cooling ribs and the shielding element, it is provided, for example, that the cooling ribs are formed as components formed separately from the shielding element and connected to the shielding element, wherein the cooling ribs are firmly bonded, in particular by soldering, to the Shielding element are connected. The shielding element is formed for example of a non-magnetic material. The cooling fins can be formed from a metallic and thus, for example, magnetic material in order to realize an advantageous heat conduction. In particular, it is conceivable that the shielding element is formed from a first material and the cooling ribs are formed from a second material different from the first material. The cooling ribs form, for example, a cooling rib structure, by means of which a particularly large surface for the heat transfer can be created. For example, the second material is aluminum, thereby enabling a particularly advantageous heat transfer from the cooling fins to the air.

In order to ensure a particularly advantageous transfer of heat from the secondary coil unit to the shielding element and thus to the cooling ribs, it is preferably provided that the secondary coil unit is connected in a heat-transferring manner to the shielding element via a heat-conducting paste. In particular, the thermal compound contacts the shielding on the one hand and the secondary coil housing on the other. The shielding element designed, for example, as a shielding plate can be designed accordingly to realize a particularly high degree of efficiency and to realize an advantageous magnetic field guidance or shielding. The shielding element can be guided below components of the motor vehicle and shield them from the magnetic field and thus protect them so that no induction or eddy current effects occur in the components.

Overall, a functional integration is provided according to the invention, so that a particularly effective inductive charging can be displayed in a cost-effective manner. In the context of the invention, the aforementioned three requirements are integrated into the shielding, so that the number of parts and thus the weight, the cost and space requirements of the charger can be kept in a very small frame. The cooling fins are arranged, for example, on a side of the secondary coil unit, in particular the secondary coil, pointing upwards, in particular in the vehicle vertical direction, so that, for example, when electrical energy is transmitted inductively from the primary coil to the secondary coil, the cooling fins are not arranged between the secondary coil and the primary coil , Therefore, the cooling fins do not influence the magnetic field or its flux, so that the cooling fins can be formed, for example, from a magnetic or electromagnetically active material.

However, if, for example, the cooling ribs are arranged on a side of the secondary coil unit, in particular the secondary coil, pointing downwards in the vertical direction of the vehicle, the ribs are arranged, for example, in an inductive energy transmission from the primary coil to the secondary coil between the primary coil and the secondary coil. In this case, the cooling ribs should not be formed from a magnetic or electromagnetically active material in order not to disturb the magnetic field or the magnetic flux undesirably. The use of the shielding element is advantageous, so that, for example, only the secondary coil can be penetrated by the magnetic field or its magnetic field lines. As a result, components which are not to be heated in the context of inductive energy transfer, can be effectively protected from the magnetic field and its magnetic field lines.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

• 1 eine schematische Perspektivansicht einer erfindungsgemäßen Ladeeinrichtung gemäß einer ersten Ausführungsform;
• 2 ausschnittsweise eine schematische und geschnittene Seitenansicht der Ladeeinrichtung gemäß der ersten Ausführungsform;
• 3 ausschnittsweise eine schematische und geschnittene Seitenansicht der Ladeeinrichtung gemäß einer zweiten Ausführungsform;
• 4 eine schematische Draufsicht der Ladeeinrichtung gemäß der zweiten Ausführungsform;
• 5 eine schematische und geschnittene Seitenansicht eines Abschirmelements der Ladeeinrichtung gemäß einer dritten Ausführungsform; und
• 6 eine schematische und geschnittene Seitenansicht des Abschirmelements gemäß der zweiten Ausführungsform.

The drawing shows in:

• 1 a schematic perspective view of a charging device according to the invention according to a first embodiment;
• 2 1, a schematic and sectional side view of the charging device according to the first embodiment;
• 3 1, a schematic and sectional side view of the charging device according to a second embodiment;
• 4 a schematic plan view of the charging device according to the second embodiment;
• 5 a schematic and sectional side view of a shield of the Charging device according to a third embodiment; and
• 6 a schematic and sectional side view of the shield according to the second embodiment.

In the figures, the same or functionally identical elements are provided with the same reference numerals.

1 shows in a schematic perspective view of a charging device 10 for a motor vehicle, in particular for a motor vehicle such as a passenger car. Show 1 and 2 the charging device 10 according to a first embodiment, wherein in 2 the charging device 10 according to the first embodiment is shown in a schematic and sectional side view. The charging device 10 shows - how well in cooperation with 2 recognizable - at least one secondary coil unit 12 on, which at least one in 2 particularly schematically illustrated secondary coil 14 includes. The secondary coil is a charging coil or is used as a charging coil to charge at least one formed for storing electrical energy or electrical current energy storage of the motor vehicle, in particular to charge. On the secondary coil 14 is electrical energy, which is provided by a primary coil, not shown in the figures, inductively transferable. In other words, in order to charge the energy storage device of the motor vehicle with electrical energy or electrical current, which is designed, for example, as a battery, in particular as a high-voltage battery (HV battery) and also as an electrical energy store, electrical energy is supplied from the power supply via the primary coil provided. The primary coil is, for example, a bottom-side charging coil, which is arranged, for example, on a floor on which the motor vehicle stands. The electrical energy provided by the current source via the primary coil is transmitted inductively and thus relative to the charging coils, contactlessly from the primary coil to the secondary coil. The inductively transmitted to the secondary coil electrical energy is passed from the secondary coil to the and in particular in the energy storage and stored in the energy storage, whereby the energy storage is charged. The charging device 10 In this case, for example, it is held at least indirectly, in particular directly, on a construction of the motor vehicle designed, for example, as a self-supporting body, and thus a component of the motor vehicle also referred to as a vehicle-side component. For example, the charging device 10 held in the fully manufactured state of the motor vehicle in the region of an underbody formed by the structure of the motor vehicle. This is to be understood in particular that the charging device 10 is arranged in fully manufactured condition below the subfloor.

How very good 2 is recognizable, comprises the charging device 10 an example designed as a shielding shield 16 , which in at least partial coverage of the secondary coil unit 12 is arranged. This means that the secondary coil unit 12 and the shielding element 16 cover each other at least partially. In the first embodiment, the secondary coil unit 12 , in particular in the vehicle vertical direction and thereby towards the bottom, at least partially, in particular at least predominantly or in the present case completely, by the shielding element 16 covered. The shielding element 16 is used for shielding and / or guiding a magnetic field, by means of which, for example, the electrical energy is inductively from the primary coil to the secondary coil 14 is transmitted. By guiding or shielding the magnetic field, for example, parts of the motor vehicle and in particular those parts of the motor vehicle can be protected from the magnetic field and thus from excessive heating occurring when the energy store is charged. Such a part, which by means of the shielding 16 can be protected from the magnetic field is in 2 shown by way of example and designated there by 18. The part 18 For example, it is designed as a carrier, in particular as a steel carrier.

The secondary coil unit 12 includes the secondary coil 14 and a secondary coil housing, also referred to simply as a coil housing 20 in which the secondary coil 14 is included. How very good 1 is recognizable, comprises the charging device 10 a holder 22 , which is formed for example of a fiber-reinforced plastic, in particular of a glass fiber reinforced plastic. By means of the holder 22 is, for example, the secondary coil unit 12 held on the structure. For this example, the holder 22 and thus the charging device 10 screwed together with the body. In addition, at least one screw 24 provided, by means of which, for example, the shielding element 16 with the secondary coil unit 12 and / or is connected to the structure.

In order to realize a particularly advantageous operation, and in particular a particularly efficient charging, in a particularly simple, space-saving, weight-saving and cost-effective manner, the shielding element is 16 with cooling fins 26 for cooling the secondary coil unit 12 Mistake. In the first embodiment, the cooling fins form 26 a cooling fin structure 28 where the cooling fins 26 and thus the cooling fin structure 28 on one, in particular in the vehicle vertical direction, the secondary coil unit 12 opposite side 30 the shielding element 16 are arranged.

The cooling fins 26 and the shielding 16 are formed, for example, as separately formed and interconnected components, for example, the cooling fins 26 cohesively and for example by soldering to the shielding 16 are connected. In particular, it is conceivable that the shielding element 16 from a first material and the cooling fins 26 are formed from one of the first material different second material. The first material is for example a non-magnetic material or an electromagnetically inactive material, so that the magnetic field by means of the shielding 16 can be advantageously shielded or guided. In other words, for example, the first material is a material impermeable to the magnetic field. The second material is for example a metallic material and preferably aluminum, so that by means of the cooling fins 26 a particularly advantageous heat dissipation can be realized. The cooling fins 26 For example, air can flow around it, so that a heat transfer from the secondary coil unit 12 , in particular of the secondary coil housing 20 , over the cooling fins 26 to the cooling fins 26 can flow around the air. As a result, an air cooling of the secondary coil unit 12 shown. The air is conveyed for example by means of a particular electrically operable fan of the motor vehicle and flows as a result around the cooling fins 26 ,

To a particularly advantageous heat transfer from the secondary coil unit 12 , in particular via the shielding element 16 , to the cooling fins 26 To realize is the secondary coil unit 12 over a thermal grease 32 heat transferring with the shielding element 16 connected. The thermal compound 32 is at least substantially flat between the secondary coil unit 12 and the shielding member 16. The thermal paste touches 32 on the one hand, the secondary coil housing 20 , On the other hand, the thermal paste touches 32 a, in particular in the vehicle vertical direction, the secondary coil unit 12 facing side 34 of the shielding 16 , Furthermore, it is conceivable that the secondary coil unit 12 , in particular the secondary coil housing 20 , the shielding element 16 touched directly. In this case, for example, one also referred to as surface or cooling surface touches the shielding element 16 , in particular in the vehicle vertical direction, facing side 36 the secondary coil unit 12 , in particular the secondary coil housing 20 , the page 34 the shielding element 16 directly. The pages 34 and 36 Thus, for example, respective cooling surfaces, via which heat from the secondary coil unit 12 to the shielding element 16 and thus to the cooling fins 26 can go over. In this case, the cooling surfaces can touch directly and / or the cooling surfaces are - as it is provided in the first embodiment - on the thermal paste 32 heat transfer or thermally conductive interconnected. For this purpose, the thermal paste touches 32 the respective cooling surfaces, especially directly.

In order to realize a particularly advantageous heat transfer, a particularly high flatness of the cooling surfaces is advantageous, which can be realized for example by a reduction in tolerance. The thermal compound 32 is a Wärmeleitmaterial, via which heat particularly advantageous from the secondary coil unit 12 to the shielding element 16 can go over. By optimizing the flatness of the cooling surfaces, a thickness of the heat-conducting material, also referred to as thickness, between the secondary coil unit 12 and the shielding element 16 be kept particularly low, whereby a particularly advantageous thermal coupling can be displayed. In addition, the weight, the cost and space requirements can be kept in a very small frame.

To an advantageous flatness of acting as a cooling module or cooling shielding 16 , especially the page 34 For example, die casting, in particular aluminum die-casting, optionally with a milling post-processing, continuous casting, in particular aluminum continuous casting, is used, or the shielding element 16 is, for example, as a milled part, in particular as Aluminiumfrästeil formed.

In the first embodiment, the cooling module in the vehicle vertical direction is above the secondary coil unit 12 arranged and at least or exclusively partially with the cooling fins 26 provided, which are formed for example as a cooling rib hats. In particular, it is conceivable that the cooling fins 26 are integrally formed with the shield 16. Advantageous cooling properties can be achieved by a small wall thickness of the heat-conducting material, by a large respective cooling surface and / or by a small wall thickness of the cooling fins 26 and / or the shielding element 16 realize. Furthermore, by using the cooling fins 26 even a particularly large surface can be realized, via which heat from the cooling fins 26 can move to the air.

Are the cooling fins 26 for example, separately from the shielding 16 trained and connected to these, it can be provided that the cooling fins 26 formed separately from each other and, for example, each individually with the shielding 16 are connected. Alternatively, it is conceivable that the cooling fins 26 are interconnected and thus a coherent or assembled unit, in particular in the form of the cooling fin structure 28 form. The assembly can thus as a whole and thus in a simple way with the shield 16 get connected. The use of the charging device 10 , in particular of the cooling module, enables the realization of a modular integration concept for different vehicle types or vehicle derivatives, in which, for example, the charging device 10 or the secondary coil unit 12 can be used in each case as a Gleichbauteil.

In particular, it is conceivable that the shielding element 16 can be manufactured as a simple and inexpensive sheet metal part. In this case, large tolerances can be allowed and a costly soldering process can be avoided, especially if the cooling fins 26 integral with the shielding 16 be formed. An elimination of the shielding 16 is possible if this is not necessary with regard to electromagnetic reasons.

3 and 4 show a second embodiment of the charging device 10 , In 3 are respectively, near the charging device 10 arranged parts of the motor vehicle designated 38. In the second embodiment is a cooling module 40 provided, to which the previous and following remarks to the respect 1 and 2 described cooling module can be transferred and vice versa. The cooling module 40 includes, for example, a plate 42 , which with cooling fins 26 of the cooling module 40 is provided. The plate 42 forms, for example, the shielding element described above 16 or does not function as a shielding element and thus is permeable to the magnetic field, for example. In particular, it is conceivable that the cooling fins 26 and the plate 42 are integrally formed with each other.

For example, close to the cooling module 40 screening 44 on, which are formed for example as shielding. In particular, the shielding elements 44 with the cooling module 40 , especially with the plate 42 , connected. The previous and following versions of the shielding 16 can readily on the respective shielding 44 be transferred and vice versa. Out 3 is particularly clear that the cooling module 40 , especially the plate 42 , for example, for cooling the secondary coil unit 12 optimized shape, in particular cross-sectional shape, has, so that an efficient cooling can be displayed. Out 3 and 4 is also the holder 22 recognizable, which is permeable to the magnetic field and thus for the electromagnetic field lines. For this purpose, the holder 22 for example, from a plastic, in particular from a fiber-reinforced plastic and thereby for example from a glass fiber reinforced plastic (GRP) formed. Especially good 4 it can be seen that the example, the shielding 16 forming plate 42 partially or locally with the cooling fins 26 is provided, which form respective cooling fin structures or cooling fin groups.

6 shows the cooling module 40 according to 3 and 4 in a schematic sectional side view. Finally shows 5 the cooling module 40 according to a third embodiment. The cooling module 406 can be used, for example, to implement the aforementioned modular integration concept, so that, for example, the cooling module 40 derivative-specific, that is, in different embodiments for different vehicle derivatives, can be used. By varying the cooling module 40 or its embodiments, it is possible, for example, for the different vehicle derivatives, the same or identical secondary coil unit 12 to use, so that the different vehicle derivatives can be realized easily and inexpensively.

LIST OF REFERENCE NUMBERS

10

loader

12

Secondary coil unit

14

secondary coil

16

shielding

18

part

20

Secondary coil housing

22

holder

24

screw

26

cooling fins

28

Fin structure

30

page

32

Thermal Compounds

34

page

36

page

38

part

40

cooling module

42

plate

44

shielding

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 102014018754 A1 [0002]

Claims (6)

Charging device (10) for a motor vehicle, comprising at least one secondary coil unit (12) which has at least one secondary coil (14), to which electrical energy provided by at least one primary coil is inductively transferable to an energy accumulator designed to store electrical energy with the inductive and at least one at least partially overlapping with the secondary coil unit (12) arranged shielding element (16) for shielding and / or guiding a magnetic field, characterized in that the shielding element (16) with cooling fins (26) for cooling the secondary coil unit (12) is provided. Charging device (10) after Claim 1 , characterized in that the cooling ribs (26) as separately from the shielding member (16) formed and connected to the shielding member (16) components are formed. Charging device (10) after Claim 2 , characterized in that the cooling ribs (26) are materially connected, in particular by soldering, with the shielding element (16). Charging device (10) after Claim 2 or 3 , characterized in that the shielding element (16) made of a first material and the cooling fins (26) are formed from a different material from the first material. Charging means (10) according to any one of the preceding claims, characterized in that the cooling ribs (26) on one of the secondary coil unit (12) facing side (34) and / or on one of the secondary coil unit (12) facing away side (30) of the shield (16 ) are arranged. Charging device (10) according to any one of the preceding claims, characterized in that the secondary coil unit (12) via a heat conducting paste (32) is heat-transmitting connected to the shielding element (16).

Images