DE102017203800A1 - DISPLACEMENT LOADING DEVICE FOR INDUCTIVELY CHARGING AN ENERGY STORAGE OF A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a charging device (20) for inductively charging an energy store (12) of a motor vehicle (10), comprising a planar coil element (30) for inductive absorption of electrical energy between a first position and a second position about a pivot axis (28 ), which is arranged laterally next to the coil element (30), an electrically connected to the coil element (30) line (40) for transmitting the electrical energy to the energy store (12), and a fixing device (50) for fixedly fixing the Line (40) with respect to the pivot axis (28). The charging device (20) is characterized in that the line (40) has a first portion (42) which is located between the fixing device (50) and the coil element (30) and arranged at least substantially on the pivot axis (28) is.

Description

The present invention relates to a charging device for inductively charging an energy store of a motor vehicle according to the preamble of claim 1 and to a motor vehicle equipped therewith according to claim 10.

In motor vehicles with electric or hybrid drive, it is expedient, the space provided energy storage for storing electrical energy (also known as battery or battery) inductively - so contactless - to charge. For this example is from the DE 10 2015 210 445 A1 a corresponding charging device is known which comprises a primary coil, for example, fixed to a substrate and a built-in motor vehicle on the underbody secondary coil. The energy transfer takes place via magnetic coupling of the coils. For efficient energy transfer, the vehicle must be parked as precisely as possible over the primary coil. Typically, the secondary coil is mounted in a motor vehicle with hybrid drive on the underside of the oil pan. The secondary coils represent a relatively large flat structure with an area of more than 250 * 250 mm ^2. For higher charging power and vehicles with high floor clearance, even larger areas for the secondary coil are necessary for sufficient magnetic coupling. Thus, the oil drain plug is usually covered by the secondary coil. For an oil change, therefore, the secondary coil must be removed or folded down. In motor vehicles with pure electric drive, although no oil pan with appropriate access requirements is present, but it can not be avoided that the relatively large secondary coil covers components that require maintenance or repair and thus also must be accessible in the rule. Thus, in this case, a removal or folding of the secondary coil is required.

When folding down, however, the connection cable for the secondary coil must be bent accordingly. One possibility for defined bending of this connecting cable has already been made in the DE 10 2015 210 445 A1 described. Folding down the secondary coil requires bending the connection lines (the HV lines are critical). Since these are shielded and have a relatively large diameter, the bending radii occurring are difficult to realize.

On the other hand, disassembly requires regular disconnection and connection of the secondary coil to each oil change. However, the plug-in systems for the high voltage used in this area are not designed for the required number of mating cycles. Each plug-in process also brings quality losses.

Large-area coils also require appropriate precautions for installation in the factory. If the connector is above the coil, it must be inserted before the coil assembly. The connecting cable must have a corresponding excess length. This must be stowed during the assembly step of the coil. This in turn means that the connection line must be bent.

The present invention has for its object to provide a (vehicle-side) charging device for inductively charging an energy storage of a motor vehicle, with which the aforementioned disadvantages can be avoided, and in particular no damage to the connecting cable when folding down the charging device occur.

This object is achieved with a charging device according to claim 1. Advantageous developments of the invention are the subject of the dependent claims.

According to the invention, the charging device for inductively charging an energy accumulator of a motor vehicle comprises a flat coil element as a secondary coil for inductive absorption of electrical energy, which is pivotable about a pivot axis between a first position (eg operating or use position) and a second position (eg maintenance position) is arranged laterally adjacent to the coil element. In other words, the pivot axis is arranged at a certain distance from the coil element and does not pass through the coil element. In addition, the pivot axis is roughly roughly in the same plane as the median plane of the flat-shaped coil element. The charging device according to the invention further comprises a line electrically connected to the coil element for transmitting the electrical energy to the energy store and a fixing device for fixed fixing of the line with respect to the pivot axis. In other words, thereby the line at a defined position relative to the pivot axis (and for example in a motor vehicle relative to the body) are held.

The charging device according to the invention is characterized in that the line has a first portion, which is located between the fixing device and the coil element and is arranged at least substantially on the pivot axis. By "at least substantially arranged on the pivot axis" is to be understood that the first portion is completely, almost completely or even approximately arranged on the pivot axis or coincides with the pivot axis, wherein it is smaller Deviations from a perfect match between the pivot axis and line does not matter significantly. In this configuration, when the coil element is pivoted from the first position to the second position, the first portion of the line is not bent in the first place as in known solutions, but is subject only to a defined torsion, as by folding the coil element no change in the Distance from the first portion to the coil element is made because the first portion is arranged on the pivot axis. Such defined torsions of the line are much easier to control in terms of material deterioration of the line, since bending stresses are avoided or greatly reduced. As a result, since no bends of the line when folding or folding back of the coil element occur, the risk of damage to the line is avoided.

The charging device according to the invention has further advantages:

Wear and damage due to movement can be excluded. Significant overlength of the cables (in order to be able to connect, for example, when folded down) and sharp bends and undefined bends of the lines are avoided. With very little additional bending movements cable guides can be designed very flexibly. There is a high degree of freedom in the design of the pivoting suspension / storage. Due to the integrative approach (movement of the line is very close to the pivot axis, there are only very small overlength, which can be performed defined) a realization in a small space is possible.

According to an advantageous embodiment of the invention, the charging device is characterized in that - when the coil element is bounded by a first main surface side and a second main surface side - the pivot axis in the region which is bounded by the planes defined by the two main surface sides, at a distance of the coil element is arranged. Thus, the pivot axis is approximately in the same "layer", as defined by the flat coil element, or also slightly outside, but still in the said area. As a result, a particularly simple and safe handling and practical applicability in particular when installing a charging device according to the invention in the area of the vehicle underbody is possible.

A further advantageous embodiment of the charging device is characterized in that the central axis of the first section coincides with the pivot axis. With such a configuration of a far-reaching match of the first section with the pivot axis occur virtually no bending stress on the line, but only torsional stresses, which allows a particularly good material conservation.

Advantageously, the line has a connection section, with which it is connected to the coil element, and the connection section is angled at a Abwinkelstelle and merges into the first section. In this case, the first section extends essentially over the entire distance from the Abwinkelstelle to the fixing device. As a result, the torsion when folding the coil element "distributed" to the maximum possible path length, which also allows for improved material protection.

It is advantageous if between the fixing device and the Abwinkelstelle a tightening device for the maintenance of the line is provided both in the first position and in the second position. In this way, in the case in which the line has a certain excess length, for example, due to the shortening caused by the torsion as a result of the coil element being folded down, a play of the line and a corresponding, usually annoying, rattling can be avoided. By keeping the line constantly taut, not only rattling but also any other movement of the line or first section can be prevented, which has beneficial effects on the aging of the line.

The present invention is particularly well suited when the cable is designed as a flat cable with at least two cable strands. In this configuration, the torsion of the line is possible in a particularly simple manner.

According to a further advantageous embodiment of the charging device according to the invention, the coil element has a main surface side to which a protective plate is releasably attached, which is in a protective structure, in particular a underrun protection of a motor vehicle, installed or installed and / or can be attached to the protective structure. Therefore, the line is well protected by the protective structure.

An advantageous variant of the attachment of the coil element is that the coil element has pins for engagement with a respective bearing device in the form of a bearing block or a resilient latching device, whereby the coil element between the first position and the second position is pivotable relative to the bearing device.

A further advantageous variant of the fastening of the coil element consists in that the coil element has hooks for engagement with a respective bearing device in the form of engagement openings, whereby the coil element between the first position and the second position is pivotable with respect to the bearing device.

The aforementioned object is also achieved by a motor vehicle with a charging device according to the above description, wherein the pivot axis is arranged at least substantially perpendicular to the vehicle vertical axis. Accordingly, the same or similar advantages as those in connection with the above described, which is why reference is made to avoid repetition of the above statements in connection with the charging device according to the invention.

Some advantageous embodiments of the invention will be explained by way of example with reference to the figures.

• 1 eine schematische Vorderansicht auf eine erfindungsgemäße Ladeeinrichtung zum induktiven Laden eines Energiespeichers eines Kraftfahrzeugs, mit einer kraftfahrzeugseitigen Sekundärspule und einer korrespondierenden Primärspule zum induktiven Übertragen von elektrischer Energie auf die Sekundärspule;
• 2 eine schematische Seitenansicht auf die Ladeeinrichtung;
• 3 eine schematische Ansicht eines beispielhaften Aufbaus einer erfindungsgemäßen Ladeeinrichtung (Sekundärspule);
• 4A und 4B schematische Ansichten einer ersten Ausführungsform einer erfindungsgemäßen Ladeeinrichtung in hochgeklappter Stellung in Seitenansicht bzw. in Draufsicht;
• 4C eine schematische Ansicht der erfindungsgemäßen Ladeeinrichtung von 4A in heruntergeklappter Stellung;
• 5A bis 5C schematische Ansichten entsprechend den 4A bis 4C einer zweiten Ausführungsform einer erfindungsgemäßen Ladeeinrichtung;
• 6A eine schematische Ansicht einer beispielhaften Leitung im Querschnitt ohne Torsion;
• 6B eine schematische Ansicht von zwei Schnitten durch eine beispielhafte Leitung ohne bzw. mit 90° Torsion;
• 6C eine schematische Ansicht eines ersten Abschnitts einer beispielhaften Leitung in Seitenansicht, wobei am linken Ende zusätzlich ein Querschnitt der Leitung ohne Torsion und am rechten Ende ein Querschnitt der Leitung mit 90° Torsion dargestellt sind;
• 7A und 7B eine perspektivische bzw. eine Seitenansicht eines ersten Beispiels für die Befestigung der Ladeeinrichtung an einer Stützstruktur;
• 8 eine Seitenansicht eines zweiten Beispiels für die Befestigung der Ladeeinrichtung an einer Stützstruktur;
• 9 eine Seitenansicht eines dritten Beispiels für die Befestigung der Ladeeinrichtung an einer Stützstruktur;
• 10 ein Beispiel für eine Verbindung der Ladeeinrichtung mit einer Fahrzeugstruktur; und
• 11A bis 11E verschiedene Stadien des Einbaus einer Ausführungsform der erfindungsgemäßen Ladeeinrichtung und deren Verschwenkung in die Gebrauchsstellung.

Show it:

• 1 a schematic front view of a charging device according to the invention for inductively charging an energy storage device of a motor vehicle, with a motor vehicle side secondary coil and a corresponding primary coil for inductively transmitting electrical energy to the secondary coil;
• 2 a schematic side view of the charger;
• 3 a schematic view of an exemplary construction of a charging device according to the invention (secondary coil);
• 4A and 4B schematic views of a first embodiment of a charging device according to the invention in the raised position in side view and in plan view;
• 4C a schematic view of the charging device according to the invention of 4A in lowered position;
• 5A to 5C schematic views according to the 4A to 4C a second embodiment of a charging device according to the invention;
• 6A a schematic view of an exemplary conduit in the cross section without torsion;
• 6B a schematic view of two sections through an exemplary line without or with 90 ° torsion;
• 6C a schematic view of a first portion of an exemplary conduit in side view, wherein at the left end in addition a cross section of the line without torsion and at the right end a cross section of the conduit are shown with 90 ° twist;
• 7A and 7B a perspective or a side view of a first example of the attachment of the charging device to a support structure;
• 8th a side view of a second example of the attachment of the charging device to a support structure;
• 9 a side view of a third example of the attachment of the charging device to a support structure;
• 10 an example of a connection of the charging device with a vehicle structure; and
• 11A to 11E various stages of installation of an embodiment of the charging device according to the invention and its pivoting in the position of use.

In 1 and 2 is one on a motor vehicle 10 attached charging device according to the invention 20 shown schematically in front or side view. From a, for example, arranged on the ground, permanently installed primary coil 19 energy is transferred to the charging device according to the invention 20 (of which only the secondary coil as a coil element 30 essential for the present invention), which is indicated by an arrow E. In 1 In addition, the vehicle vertical axis Z is indicated, to which the coil element 30 is aligned vertically in its planar configuration.

In the following figures, the same reference numerals are used for the same or equivalent parts and not described again for reasons of scarcity of representation.

3 shows an exemplary structure of the charging device according to the invention 20 used flat coil element 30. In a housing 33 is a coil arrangement 34 (ie the secondary coil) arranged. In this illustration, the upper side becomes the first main surface side 31 while the bottom is referred to as the second major surface side 32 referred to as. Between the coil assembly 34 and the top is a ferrite layer 35 arranged. The electrical connection of the coil element 30 to an energy store 12 of the motor vehicle 10 via a line 40 with its connection section 44 ,

In the 4A and 4B is a first embodiment of the charging device according to the invention 20 shown with folded coil element 30. The coil element 30 is in this embodiment by means of pins 74 at each bearing blocks 76 (Which are provided for example on a vehicle body) attached. The fortifications shown here 71 (For example, screws) are used for secure attachment of the folded-up coil element 30 on the vehicle body. With the reference number 28 is the pivot axis designated around which the coil element 30 from the in 4A shown folded up position in the in 4C shown folded down or folded down position (and back again) can be pivoted. This is indicated by an arrow V in 4C indicated.

The electrical connection is made via a connection cable 40 that, for example, when folding up and down the coil element 30 , but also, for example, in the position of use while driving a motor vehicle - via a (fixed vehicle) fixing 50 stationary (in this example on the vehicle body) is held. In this embodiment, the line 40 a first section 42 on. The first paragraph 42 runs linear or stretched up to a Abwinkelstelle 43 where the line 40 is angled and located in a connection section 44 continues, which is connected to the coil element 30. Like from the 4A to 4C is clearly visible, runs the second section 42 the line 40 exactly on the axis of rotation 28. In other words, fall the central axis of the second section 42 and the rotation axis 28 together.

The 5A to 5C show a second embodiment of the charging device according to the invention 20 in to the 4A to 4C analog views. In the second embodiment is additionally a tightening device 60 provided in the form of a stop or a curved hold-down device, which ensures by their nature of the design that the line 40 or whose second section 42 is not "loose" during travel movements of the motor vehicle, for example, and generates rattling noises and premature aging of the line 40 respectively. 42 Feeds. In particular from 5B it can be seen that in this second embodiment, the first section 42 is not as straight as in the first embodiment, and that the first section 42 not completely on the pivot axis 28 lies, but only approximate or only "essentially".

6A shows in cross section an exemplary conduit 40 , at the two line strands 46 . 47 in an outer insulation layer 48 are included with braided screen. How out 6B can be seen, in a torsion by 90 ° - which is indicated by two arrows T - the two strands of wire 46 and 47 be easily moved against each other or represented. In such a torsion thus occur no problematic material stresses. This fact is also in the side view of 6C of the first portion 42 with those at the ends of the first portion 42 below indicated cross sections without / with torsion shown schematically, after which each one of the two strands of wire 46 and 47 experiences only a small bending movement and has only a slightly higher length requirement.

7A and 7B show in perspective view and in sectional view a first example of the attachment of the charging device according to the invention 20 on a protective structure 14 for which the underbody structure of a motor vehicle is assumed here by way of example. At the underbody structure 14 - which also serves as underrun protection - are bearing blocks 76 provided in the respective pin 74 engage, which on the coil element 30 are attached. As in particular from 7A can be seen, thereby the coil element 30 be pivoted down about the pivot axis 28 around. As in 7B is shown is at the bottom of the coil element 30 attached a protective plate 70, which serves as underride protection for the coil element 30 serves. With a corresponding attachment of the coil element 30 at the underbody structure 14 - For example, on the protective plate 70 - can be an air gap 75 between the bearing block 76 and the pin 74 be formed, whereby it is possible, the pin 74 to keep power-free during operation and thus wear-free.

8th shows a second example of the attachment of the charging device according to the invention 20 at the underbody structure 14 , Unlike the first example here is the pin 74 laterally in a resilient latching device 77 (also referred to as a clip) inserted or engaged on the underbody structure 14 is attached.

9 shows a third example of the attachment of the charging device according to the invention 20 at the underbody structure 14 , Here, respective ones will be on the coil element 30 fastened hooks in engagement openings 79 hung in the underbody structure 14 are provided.

All three examples described above, the attachment of the charging device according to the invention 20 on the underbody structure 14 has in common that the coil element 30 in each case from the illustrated first position (position of use) down to the second position (maintenance position) can be pivoted.

10 represents how the charging device according to the invention 20 in the protective cover or underbody structure 14 can be integrated. At the bottom of the coil element 30 is a protective plate 70 attached, at the same time as a carrier for the coil element 30 serves. The attachment of the assembly from the coil element 30 and the protective plate 70 at the underbody structure 14 serve respective screws 71 (see 4A and 4B ). The protective plate can do this 70 and the coil element 30 together by pivoting the pins 74 in the clip 77 be folded down. This arrangement has the advantage that acting forces on the protective plate 70 remain limited and thereby the coil element 30 and the respective "hinge" is hardly loaded even with heavy rockfalls.

Based on 11A to 11E is finally briefly the installation of a charging device according to the invention 20 on the underbody of a motor vehicle 10 of which in dashed lines the sub-floor clearance line 16 is shown. According to 11A first, the coil element 30 with the pin attached to it 74 in the on the motor vehicle 10 fixed resilient latching device 77 inserted or clipped. Thus, the coil element 30 as shown by 11B with his spigot 74 in the clip 77 freely hung. Then the line 40 by means of the fixing device 50 , which is exemplified here as a fastening strap, fixed (see 11C ) and then the coil element 30 worked up. Since the coil element 30 as shown by 11D not yet with the underbody structure 14 is firmly connected (screwed), is the coil element 30 still below its end position, which corresponds to the first position (position of use). After screwing the coil element 30 at the underbody structure 14 is the coil element 30 in the in 11E shown end position (use position).

It can be seen that the same system as for pivoting the coil element 30 can be used from the use position in the maintenance position, can already be used during assembly. In particular, it should be mentioned that thus during assembly of the coil element 30 first the line 40 can be inserted and this line must have no excess length, which would then be stowed in a separate assembly step.

It should be noted that the features of the invention described with reference to individual embodiments or variants, such as type and configuration of the coil element, the pivot axis and the lines with their respective sections, as well as their spatial arrangement, may also be present in other embodiments, unless otherwise stated or prohibited by itself for technical reasons. Moreover, such features of individual embodiments described in combination need not necessarily always be realized in a particular embodiment.

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 102015210445 A1 [0002, 0003]

Claims (10)

Charging device (20) for inductively charging an energy store (12) of a motor vehicle (10), comprising a planar coil element (30) for inductive absorption of electrical energy which is pivotable about a pivot axis (28) between a first position and a second position, which is arranged laterally next to the coil element (30), a line (40) electrically connected to the coil element (30) for transmitting the electrical energy to the energy store (12), and a fixing device (50) for fixedly fixing the line (40) with respect to the pivot axis (28), characterized in that the conduit (40) has a first portion (42) which is located between the fixing device (50) and the coil element (30) and arranged at least substantially on the pivot axis (28) is. Charging device (20) after Claim 1 characterized in that the coil element (30) is bounded by a first major surface side (31) and a second major surface side (32) and the pivot axis (28) in the region defined by the planes defined by the two major surface sides (31, 32) is limited, is arranged at a distance from the coil element (30). Charging device (20) after Claim 1 or 2 , characterized in that the central axis of the first section (42) coincides with the pivot axis (28). Charging device (20) according to one of the preceding claims, characterized in that the line (40) has a connecting portion (44), with which it is connected to the coil element (30) and which is angled at a Abwinkelstelle (43) and in the first section (42) and the first section (42) extends substantially the entire distance from the Abwinkelstelle (43) to the fixing device (50). Charging device (20) according to one of Claims 1 to 3 , characterized in that the conduit (40) has a connecting portion (44) with which it is connected to the coil element (30) and which is angled at an Abwinkelstelle (43) and merges into the first section (42) and between the Abwinkelstelle (43) and the fixing device (50) is provided with a tightening device (60) for keeping the line (40) in both the first position and in the second position. Charging device (20) according to one of the preceding claims, characterized in that the line (40) as a flat cable with at least two line strands (46, 47) is formed. Charging device (20) according to one of the preceding claims, characterized in that the coil element (30) has a main surface side (32) on which a protective plate (70) is detachably attached, which can be integrated into a protective structure, in particular an underrun protection of a motor vehicle / or attachable to the protective structure. Charging device (20) according to one of the preceding claims, characterized in that the coil element (30) has pins (74) for engagement with a respective bearing device in the form of a bearing block (76) or a resilient latching device (77), whereby the coil element ( 30) is pivotable relative to the bearing device between the first position and the second position. Charging device (20) according to one of Claims 1 to 7 characterized in that the spool member (30) has hooks (78) for engagement with a respective bearing means in the form of engagement apertures (79) whereby the spool member (30) is pivotable between the first position and the second position with respect to the bearing means (20 ). Motor vehicle (10) with a charging device (20) according to one of the preceding claims, wherein the pivot axis (28) is arranged at least substantially perpendicular to the vehicle vertical axis (z).

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