DE102018003283A1 - Energy system with multi-part energy storage and several inductive charging coils, and method for charging an electrical energy storage - Google Patents

Abstract

The invention relates to a motor vehicle energy system (1) for supplying a 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 to Charging of the electrical energy store (3). In order to enable a shorter charging time during inductive charging of the electrical energy store (3), it is provided that the electrical energy store (3) has a plurality of partial stores (4), each of the partial stores (4) within the Energy system (1) is individually contactable, the inductive charging unit (7) has a plurality of partial load units (8), each of the partial memory (4) is associated with exactly one of the partial load units (8) and each of the plurality of partial memory (4) exactly by him associated with the partial load units (8) is chargeable.

Description

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

A system for charging an electric energy storage of an electric vehicle by means of a contacting unit is for example in the WO 2017/083 846 A1 described.

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 2016/00 33 288 A1 a power supply system for a motor vehicle having a plurality of power supply coils, which are adapted to wirelessly transmit energy to a movable vehicle.

In order to improve the usability of a motor vehicle with an electrical energy storage device, in particular an electric vehicle, in particular a shortest possible charging time for the electrical energy storage device should be sought. It is therefore an object of the present invention to allow a shorter charging time when inductive charging an electrical energy storage.

This object is achieved by the subject matters of the independent claims. Advantageous embodiments with t expedient are subject of the dependent claims, 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 memory is associated with exactly one of the partial load units and each of the plurality of partial memory is exactly charged by its associated part of the partial load units. 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.

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-storage within the energy system can be realized by respective contact, 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 patent claim 6. To achieve the object according to the invention, it is provided that a plurality of partial stores of the electrical energy store are respectively charged by exactly one partial loading unit of the inductive charging unit.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. The above in the Described features and feature combinations and the features mentioned below in the description of the figures and / or in the figures alone features and combinations of features can be used not only in the combination, but also in other combinations or alone, without departing from the scope of the 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 may each comprise a plurality of coils. In the present case, each of the partial load units 8th each formed by exactly one coil. The partial load units 8th or their coils are each designed to provide energy from the alternating magnetic field in the form of a portion of the electrical power for charging the electrical energy storage. In each of the coils of the partial load 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 store 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 implemented such that an electrical voltage, which in the one coil or the plurality of coils of one of the partial 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 and 3 each show in 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 on a roof of the motor vehicle 2 arranged. The several part load units 8th are made 2 seen. According to 2 these are more than three partial units 8th while in 1 For reasons of clarity, only three partial load units 8th are shown.

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 partial load units 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.

For example, the exciter unit 9 be mounted on a ceiling of a garage. About a power cable 16 can the exciter unit 9 be connected to a power grid. According to 3 is the loading unit 7 according to a vehicle vertical direction 15 displaced executed. In this way, a distance between loading unit 7 and exciter unit 9 for charging the electrical energy storage 3 be minimized. For this purpose, the motor vehicle 2 or the charging unit 7 For example, have a parallelogram kinematics with electric motor. In other embodiments, the exciter unit 9 along the vehicle vertical direction 15 be executed displaced. For example, the exciter unit 9 for this purpose in the direction of the motor vehicle 2 or in the direction of the loading unit 7 be designed lowered. This results in the following combinations: solid exciter unit 9 and relocatable loading unit 7 , movable exciter unit 9 and relocatable loading unit 7 and fixed loading unit 7 with displaceable exciter unit 9 ,

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

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

• WO 2017/083846 A1 [0002]
• US 2016/0033288 A1 [0004]

Claims (6)

Motor vehicle energy system (1) for supplying a motor vehicle (2) with electrical energy, comprising - 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 to 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) within the energy system (1) being individually contactable, - the inductive loading unit (7) a plurality of partial load units (8), wherein each of the partial storage (4) is associated with exactly one of the partial load units (8), and - each of the plurality of partial storage units (4) can be charged by its associated one of the partial load units (8). Motor vehicle energy system (1) according to Claim 1 , characterized in that the Teilladeinheiten (8) each comprise one or more coils. Motor vehicle energy system (1) according to Claim 1 or 2 , characterized in that the energy system (1) comprises a switching device (6) which is adapted to switch the plurality of partial memory (4) alternately parallel and in series with each other and to electrically separate the plurality of partial memory (4) from each other. Motor vehicle (2) with a motor vehicle energy system (1) according to one of the preceding claims, characterized in that the inductive charging unit (7) is arranged in an area of a roof of the motor vehicle (2). Motor vehicle (2) according to Claim 4 characterized in that the inductive charging unit (7) at least partially according to a vehicle vertical direction (15) is displaceable. 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 storage device (3) by the inductive charging unit, (7) characterized in that - a plurality of partial memory (4) of the electrical energy storage device (3) are charged by exactly one part loading unit (8) of the inductive charging unit (7).

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