DE102018006410A1 - Motor vehicle with motor vehicle energy system and method for charging an electrical energy storage - Google Patents

Abstract

The invention relates to a motor vehicle (2) with a motor vehicle energy system (1) for supplying the motor vehicle (2) with electrical energy, with an electrical energy store (3), and an inductive charging unit (7) for inductively receiving energy In order to enable a more comfortable charging of the electrical energy store (3), it is provided that the electrical energy store (3) has a plurality of partial stores (4), wherein each of the partial storage (4) within the energy system (1) is individually contactable, - the inductive charging unit (7) has a plurality of partial load units (8), wherein each of the partial memory (4) is associated with exactly one of the partial load units (8) and wherein the a plurality of partial load units (8) each have at least one coil (20) which on a manner of a radiator grill (22) formed front are arranged in the region of the motor vehicle (2), and each of the several partial storage units (4) can be charged exactly by the partial load units (8) assigned to it

Description

The invention relates to a motor vehicle having a motor vehicle energy system for supplying the motor vehicle with electrical energy, having an electrical energy store and an inductive charging unit for inductively receiving energy from an alternating magnetic field and providing an electrical power for charging the electrical energy store. A second aspect of the invention relates to a method for charging an electrical energy store of a motor vehicle.

A system for powering an electric vehicle is for example in the EP 2 463 162 A3 described. The system has a battery, which is divided into standardized, elongated battery modules, which can be replaced when changing the battery from the side.

In order to increase comfort for a user when operating a motor vehicle with an electrical energy store, in particular an electric vehicle, an inductive energy transmission from the prior art is also known. In the context of inductive energy transmission, the inductive charging unit of the motor vehicle can be inductively or magnetically coupled to an exciter coil of a charging unit. The inductive charging unit can then receive the energy from an alternating magnetic field of the exciter coil. In the inductive charging unit in particular an electrical voltage is thereby induced as a charging voltage for charging the electrical energy storage.

In this context, the describes US 2014/0 001 875 A1 a mobile terminal, which is not only able to wirelessly receive electrical energy from a source device but also adapted to wirelessly transmit electrical energy to a target device.

In order to improve the usability of a motor vehicle with an electrical energy storage, in particular of an electric vehicle, in particular the most convenient possible charging of the electrical energy storage is to be possible. It is therefore an object of the present invention to enable a more comfortable charging of the electrical energy storage.

This object is achieved by the subject matters of the independent claims. Advantageous embodiments with expedient developments are the subject matter of the subclaims, the description and the figures.

In order to further develop the aforementioned motor vehicle energy system according to the preamble of patent claim 1 such that a shorter charging time is made possible during inductive charging of the electrical energy store, according to the invention it is provided that the electrical energy store has a plurality of partial stores, each of the partial stores being individually within the energy system can be contacted, the inductive charging unit has a plurality of partial load units, each of the partial storage is associated with exactly one of the partial load units and wherein the plurality of partial load units each have at least one coil which are arranged on a shaped like a grille front portion of the motor vehicle, and each of a plurality of partial storage can be charged exactly by the partial load units assigned to it. In other words, the electrical energy store is subdivided into the plurality of sub-stores, each of the sub-stores being accurately chargeable by one of the plurality of sub-stores. In this case, each of the partial load units is designed to charge exactly one of the partial memories. In other words, each of the partial load units is designed to provide part of the electrical power for charging the electrical energy store for exactly one of the partial memories. The electric power for charging the energy storage is thus provided by each of the partial load units at a fraction.

The coils of the charging unit or of the partial charging units are in particular electrical tracks, that is to say inductances. The coils are arranged in a front part of the motor vehicle on the remaining motor vehicle. The front end is designed in the manner of a radiator grille. The coils can be viewed from outside the motor vehicle inside or behind the grille, in particular within or behind kidneys of the grille, arranged. The grille can thus form a lining for the coils.

In a further refinement, the motor vehicle may have at least one flap in the front region shaped in the manner of a grille, which is displaceable between a non-loading position and a loading position, wherein the coils of the plurality of partial load units (8) are concealed by the flap in the non-loading position and in the loading position are not covered. The flap can be moved electrically for shifting between the non-loading position and the loading position by means of an engine of the motor vehicle. In other words, a motor for displacing the at least one flap can be arranged in the front region of the motor vehicle.

According to a further development, it is provided that the motor vehicle has a parking assistant which is set up to drive the motor vehicle autonomously into a loading position relative to an exciter unit and to initiate a charging process. In the loading position, the motor vehicle can assume a predetermined relative position relative to the excitation unit. Initiation of the charging process may include issuing a command to displace the flap from the non-loading position to the loading position.

Each of the partial load units may each comprise one or more coils. The respective coils of the partial charging units are preferably respective receiver coils, which receive energy from the alternating magnetic field inductively and on the basis of which provide a respective electrical voltage. The respective voltage of one of the partial load units can be applied to the partial storage unit associated with the respective partial load unit.

The individual contactability of each of the sub-memories within the energy system can be realized by respective contacts, which are guided from an interior of the electrical energy storage to the outside. The energy system may have a switching device which is designed to switch the multiple partial memories alternately in parallel and in series with one another and to electrically separate the several partial stores from one another. For example, the switching device is connected to the respective contacts of the plurality of partial memory.

A second aspect of the invention relates to a method for charging an electrical energy store according to the preamble of claim 6. To achieve the object of the invention, it is provided that a plurality of partial memory of the electrical energy storage in each case by exactly one, each different and on a shaped like a grille front Part of the motor vehicle arranged part loading unit of the inductive charging unit to be charged.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. 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 ein Blockdiagramm eines Kraftfahrzeug-Energiesystems;
• 2 ein Kraftfahrzeug mit einem solchen Kraftfahrzeug-Energiesystem schematisch aus einer ersten Perspektive;
• 3 dasselbe Kraftfahrzeug schematisch aus einer zweiten Perspektive.

Showing:

• 1 a block diagram of a motor vehicle power system;
• 2 a motor vehicle with such a motor vehicle energy system schematically from a first perspective;
• 3 the same motor vehicle schematically from a second perspective.

1 shows a motor vehicle energy system 1 with an electrical energy storage 3 and an inductive charging unit 7 , The loading unit 7 is designed for the inductive reception of energy from an alternating magnetic field. In addition, the inductive charging unit 7 for providing an electrical power for charging the electrical energy storage 3 educated.

In the present case is the electrical energy storage 3 into several partial storage 4 divided. Each of the partial memories 4 can do this within the motor vehicle energy system 1 be individually contactable. For this purpose, in the present case, respective connections 12 for each of the sub stores 4 from a housing 13 of the electrical energy storage 3 led out. Each of the partial memories 4 here has several cells 5 on. In other words, there are a lot of cells 5 of the electrical energy storage 3 , in particular symmetrically or in equal proportions, to the plurality of partial memories 4 divided up. The cells 5 one of the partial memories 4 can within the respective sub memory 4 be connected in series, parallel or mixed in series and parallel with each other.

The inductive charging unit 7 has several partial load units 8th on. Each of the several partial load units 8th can in each case not shown embodiments, several coils 20 exhibit. In the present case, each of the partial load units points 8th by exactly one coil each 20 educated. The partial load units 8th or their coils 20 are each adapted to provide energy from the alternating magnetic field in the form of a portion of the electrical power for charging the electrical energy storage. At the coils 20 of the partial units 8th these are inductors. In each of the coils 20 of the partial units 8th A voltage is induced during a charging process by the alternating magnetic field.

The motor vehicle energy system 1 in this case additionally has a switching device 6 on. The switching device 6 has switching elements 10 . 11 on. The switching device 6 is designed to be the multiple partial storage 4 alternately parallel and in series with each other. The switching device 6 has connections 14 for providing an electrical power in the electrical energy storage 3 on. For example, by means of the connections 14 the electrical power from the energy storage 3 for operating a consumer of a motor vehicle 2 , in particular an electric motor of the motor vehicle 2 , provided. In addition, the switching device 6 be designed to the electrical energy storage 3 with the loading unit 7 electrically connect and disconnect. This will be explained in more detail below. In the present example, the partial memories 4 concerning the connections 14 for example, by closing the switch 10 and opening the switch 11 be connected in series and by opening the switch 10 and closing the switches 11 be switched in parallel.

Each of the part load units 8th in the present case is exactly one of the partial storage 4 assigned. It is envisaged that each of the partial load units 8th is designed to exactly their assigned to the partial memory 4 be supplied with electrical energy or an electrical power for charging. In other words, the energy system 1 executed such that an electrical voltage, which in the one coil 20 or the multiple coils 20 one of the part loading units 8th is induced, exactly and exclusively to the terminals 12 of the respective part loading unit 8th associated partial memory 4 can be created. In other words, the energy system 1 executed such that each of the partial memory 4 in each case by exactly one of the partial load units 8th , that is the respective partial storage 4 assigned, is charged or supplied with a portion of the electrical power for charging. In particular, each of the plurality of partial load units 8th a different one of the partial memories 4 assigned.

In other words, the electrical energy storage 3 , which is designed in particular as a traction battery or high-voltage storage, into a plurality of segments, namely the partial storage 4 , divided. The segments, ie the partial memories 4 , can through the switching device 6 be switched in parallel and in series as well as separated from each other. For this purpose, the switching device 6 a corresponding control device and / or a mechanical separation unit include. Each of the segments or each of the partial memories 4 when loading through its own part loading unit 8th namely the partial load unit associated therewith 8th , loaded.

The 2 shows in each case a schematic perspective view of a motor vehicle 2 with such a motor vehicle energy system 1 , In 2 Here is the electrical energy storage 3 as well as the partial storage 4 shown schematically. The inductive charging unit 7 is in the front area of the motor vehicle 2 arranged. The front area of the motor vehicle 2 is like a grille 22 designed. The several part load units 8th or their coils 20 are made 2 seen. In the exemplary embodiment according to 2 has the motor vehicle 2 three partial units 8th each with exactly one coil 20 on. In 1 are also three partial load units 8th shown. The partial load units 8th or their coils 20 are by means of an electrical connection 23 , in particular a cable, with the electrical energy storage 4 connected.

In the 2 and 3 additionally shown is an exciter unit 9 for generating the alternating magnetic field, which in turn from the charging unit 7 Will be received. In this case, the exciter unit 9 several divider units 17 on. Advantageously, for each of the partial load units 8th a corresponding Teilerregereinheiten 17 is provided. Each of the divider units 17 may include one or more excitation coils for generating a portion of the alternating magnetic field. In particular, it is provided that for charging the electrical energy storage 3 the respective partials 8th end face to its corresponding Teilerregereinheit 17 to be ordered. In other words, a magnetic or inductive active connection between the partial loading units 8th and their respective corresponding divider exciter unit 17 optimized or maximized. This allows the energy transfer from each of the Teilerregereinheiten 17 to the respective corresponding part loading unit 8th be maximized. The arrangement of the exciter unit 9 and the loading unit 7 relative to each other, for example, by a Einparkassistenten (not shown in the figures) of the motor vehicle 2 respectively. The parking assistant can be designed to the motor vehicle 2 partially or completely autonomously to control and / or a driver of the motor vehicle 2 To provide driving instructions.

For example, the exciter unit 9 be mounted inside a garage. Relative to a parking space of the motor vehicle 2 in the garage can be the exciter unit 9 especially be frontal. Advantageously, the excitation unit is located 9 inside the garage in an area of the garage where the grille is 22 of the motor vehicle 2 in a designated parking position of the motor vehicle 2 located in the garage. About a power cable 16 can the exciter unit 9 be connected to a power grid.

For the sake of clarity, is in 3 not the entire motor vehicle 2 shown. In 3 the partial load units are shown 8th of the motor vehicle 2 as well as the exciter unit 9 , In 3 are additional flaps 21 shown which part of the radiator grille 22 molded front portion of the motor vehicle can be. In particular, the flaps 21 be designed to air intakes of the radiator grille 22 to cover up. Here are the flaps 21 designed to be the coils 20 to conceal while the motor vehicle 2 not loaded. The flaps 21 For this purpose, it can be displaced between a non-loading position and a loading position. In the loading position are the coils 20 not through the flaps 21 hidden or released, so that a coupling between Teilerregereinheiten 17 and coils 20 is possible. In the non-loading position, the coils 20 through the flaps 21 be concealed or not released, so that an aerodynamics and an external appearance of the motor vehicle 2 can be improved while it is not being loaded. The car 2 can be an electric drive for moving the flaps 21 between the non-loading position and the loading position. This is not shown in the figures for reasons of clarity. This electric drive can, for example, shortly before or after reaching a proper charging position of the motor vehicle 2 relative to the exciter unit 9 be controlled by the above-mentioned parking assistant.

LIST OF REFERENCE NUMBERS

1

Car power system

2

motor vehicle

3

electrical energy storage

4

parts store

5

cell

6

switching device

7

charging unit

8th

Part loading unit

9

exciter unit

10

switching element

11

switching element

12

connection

13

casing

14

connection

15

Vehicle vertical direction

16

power cable

17

Part working modules

20

Kitchen sink

21

flap

22

radiator grill

23

Electrical connection

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

• EP 2463162 A3 [0002]
• US 2014/0001875 A1 [0004]

Claims (5)

Motor vehicle (2) with a motor vehicle energy system (1) for supplying the motor vehicle (2) with electrical energy, with - an electrical energy store (3), and - an inductive charging unit (7) for inductively receiving energy from an alternating magnetic field and for providing an electrical power for charging the electrical energy store (3), characterized in that - the electrical energy store (3) has a plurality of partial stores (4), each of the partial stores (4) being individually contactable within the energy system (1), the inductive charging unit (7) has a plurality of partial loading units (8), wherein each of the partial storage (4) is associated with exactly one of the partial loading units (8) and wherein the plurality of partial loading units (8) each comprise at least one coil (20) which is connected to a arranged in the manner of a radiator grille (22) shaped front portion of the motor vehicle (2), and - each of the plurality of partial memory (4) gen au is chargeable by the associated with him the partial load units (8). Motor vehicle (2) according to Claim 1 , characterized in that the motor vehicle (2) in the manner of a grille (22) shaped front portion at least one flap (21) which is displaceable between a non-loading position and a loading position, wherein the coils (20) of the plurality of partial load units ( 8) are concealed by the flap (21) in the non-loading position and are not covered in the loading position. Motor vehicle (2) according to Claim 1 or 2 , characterized in that the flap (21) for displacing between the non-loading position and the loading position by means of an engine of the motor vehicle (2) is electrically movable. Motor vehicle (2) with a motor vehicle energy system (1) according to one of the preceding claims, characterized in that the motor vehicle (2) has a parking assistant which is set up to autonomously move the motor vehicle (2) into a loading position relative to an exciter unit (9 ) and initiate a charging process. Method for charging an electrical energy store (3) of a motor vehicle (2) with electrical energy, comprising the steps of: - receiving energy from an alternating magnetic field by an inductive charging unit (7) of the motor vehicle (2) - providing an electrical power for charging the vehicle electrical energy store (3) by the inductive charging unit, (7) characterized in that - a plurality of partial memory (4) of the electrical energy store (3) each by exactly one, respectively different and on a like a grille (22) shaped front portion of the Motor vehicle (2) arranged part loading unit (8) of the inductive charging unit (7) are charged.

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