DE102018112108A1 - Method for tempering a current storage - Google Patents

Abstract

A method for controlling the temperature of a power accumulator (1) of an electrically driven motor vehicle (2), wherein the motor vehicle (2) at least one electrical component (3, 4, 5) for driving the motor vehicle (2), the power storage (1) and at least one cooling circuit (6, 7) for tempering the electrical components (3, 4, 5) and the current memory (1); wherein the method comprises at least the following steps: a) operating the motor vehicle (2) and actively controlling the temperature of the electrical component (3, 4, 5) and of the power accumulator (1) via the at least one cooling circuit (6, 7); c) Continuing the active tempering of at least the energy accumulator (1) by utilizing a waste heat of the electrical component (3, 4, 5) for heating the energy accumulator (1) via the at least one cooling circuit (6, 7).

Description

The invention relates to a method for controlling the temperature of a power accumulator, in particular a power accumulator, which is used in a motor vehicle for storing electrical energy. In particular, the motor vehicle has an electric machine for driving the motor vehicle, wherein the electric machine can be driven by the electrical energy stored in the power storage.

At low temperatures, it is problematic for power storage (also depending on the type of cell used) to provide power and energy in sufficient quantity for the drive of the motor vehicle. The problem can be solved by heating the power storage. It is known to heat the power storage z. For example, to use electrical energy (eg for the operation of PTC elements, HV heaters, etc.). About the heating of the power storage, the respective requested electrical power can be provided.

However, the electrical energy used for the heating consumes the energy provided for the drive of the motor vehicle so that the available range is reduced, especially in cold ambient conditions.

From the DE 10 2007 004 979 A1 is z. B. known a power storage z. B. preheat during a cold start.

The object of the present invention is at least partially to solve the problems mentioned with reference to the prior art. In particular, a method is to be proposed by which an energy-efficient temperature control of a current storage is made possible.

To solve these problems, a method with the features according to claim 1 contributes. Advantageous developments are the subject of the dependent claims. The features listed individually in the claims can be combined in a technologically meaningful manner and can be supplemented by explanatory facts from the description and / or details of the figures, with further embodiments of the invention are shown.

1. a) Betreiben des Kraftfahrzeuges und aktives Temperieren der elektrischen Komponente und des Stromspeichers über den mindestens einen Kühlkreislauf;
2. b) Einstellen des Betriebs des Kraftfahrzeuges;
3. c) Fortsetzen des aktiven Temperierens zumindest des Stromspeichers durch eine Nutzung einer Abwärme der elektrischen Komponente zum Erwärmen des Stromspeichers über den mindestens einen Kühlkreislauf.

It is proposed a method for controlling the temperature of a power storage of an electrically driven motor vehicle. The motor vehicle has at least one electrical component for driving the motor vehicle, the power storage and at least one cooling circuit for controlling the temperature of the electrical component and of the power accumulator. The method has at least the following steps:

1. a) operating the motor vehicle and active temperature control of the electrical component and the power storage device via the at least one cooling circuit;
2. b) adjusting the operation of the motor vehicle;
3. c) Continuing the active tempering of at least the power storage by using a waste heat of the electrical component for heating the power storage device via the at least one cooling circuit.

In the present case, it is proposed to use the exhaust heat of the at least one electrical component (and optionally further components of the motor vehicle) which is still present after setting or terminating the (driving) operation of the motor vehicle for further heating of the power accumulator. In particular, as large a proportion of the waste heat as possible should be transferred to the current storage so that it can be kept as long as possible at as high a temperature as possible (as close as possible, for example, to a maximum permissible temperature of the energy store). Thus, the heat energy of the motor vehicle can be used and z. B. be transferred to the power storage. The heat thus stored in the power storage can be reused in particular for restarts of the motor vehicle, wherein the need for preheating the power storage can be reduced.

The at least one electrical component comprises z. As a power electronics, an electrical machine or a converter, for. B. a DC-DC converter.

The operation of the motor vehicle comprises, in particular, moving the motor vehicle and / or activating the electric machine, wherein setting of the operation comprises an end of the movement (of the motor vehicle and / or of the electric machine). In particular, the setting of the operation comprises parking the motor vehicle and leaving the motor vehicle by the user.

According to step c) of the method is proposed, in particular immediately after step b) to further temper the power storage. In particular, the goal should be pursued to deliver as little heat energy to the environment and conversely to transfer as much heat energy to the power storage.

In particular, therefore, no preheating before z. B. a cold start can be realized by the present method, but a reheating the power storage after setting the operation of the motor vehicle done.

In particular, step c) is terminated at least when a first temperature of the energy store has reached a limit temperature of a cooling fluid which is used to transport the waste heat of the electrical component to the power storage.

In particular, step c) is ended when a heat transfer from the cooling fluid to the power storage device can no longer or no longer be efficient (if, for example, an electrical energy that is used for heat transport, eg through the operation of the pumps , would be higher than the heat energy that can still be transferred to the power storage).

In particular, the at least one electrical component is tempered by at least one first cooling circuit and the power storage by a second cooling circuit. At least in step c), the first cooling circuit and the second cooling circuit for the cooling fluid used are fluidly connected.

The first cooling circuit and the second cooling circuit are preferably separated from one another by fluid technology before step c) (that is to say, for example, during step b).

The first cooling circuit may include a first pump for delivering the cooling fluid and the second cooling circuit having a second pump for conveying the cooling fluid. In step c), both pumps are operated to deliver the cooling fluid.

At least in step c), at least one heat exchanger, which is used at least temporarily during step b) for cooling a cooling fluid, is at least reduced in terms of its cooling capacity.

At least in step c), the cooling fluid is preferably conducted past the at least one heat exchanger via a bypass.

In particular, at least in step c) a heat dissipation to an environment of the cooling circuit is reduced.

In particular, thermal insulation of at least parts of the at least one cooling circuit relative to the environment can be intensified, at least in step c).

A thermal insulation can z. B. by the closing of openings (cooling air openings) can be realized, is dissipated by the otherwise waste heat from the cooling circuit or from the at least one component to the environment. In particular, z. B. the heat exchanger by closing a blind or blinds from the environment thermally insulated.

It is further proposed a motor vehicle, at least comprising at least one electrical component for driving the motor vehicle, a power storage, at least one cooling circuit for controlling the temperature of the electrical components and the power storage and a control device at least for operating the cooling circuit. The control unit is suitably designed and / or set up to carry out the method. In particular, the controller may perform the method.

In particular, the motor vehicle has a first cooling circuit for controlling the temperature of the electrical components and a second cooling circuit for controlling the temperature of the energy accumulator. The first cooling circuit and the second cooling circuit can be fluidly connected for the cooling fluid used.

Furthermore, the method can also be executed by a computer or with a processor of a control unit.

Accordingly, there is also proposed a data processing system comprising a processor adapted / configured to perform the method or part of the steps of the proposed method.

A computer-readable storage medium may be provided that includes instructions that, when executed by a computer / processor, cause it to perform the method or at least part of the steps of the proposed method.

The statements relating to the method are in particular applicable to the motor vehicle, the system, the storage medium or the computer-implemented method, and vice versa.

The comments on the method are particularly applicable to the motor vehicle and vice versa.

By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily (only) serve to distinguish a plurality of similar objects, variables or processes, ie in particular no dependence and / or order of these objects, quantities or mandate processes to one another. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.

• 1: ein Kraftfahrzeug mit Kühlkreisläufen in einem ersten Zustand; und
• 2: die Kühlkreisläufe nach 1 in einem zweiten Zustand.

The invention and the technical environment will be explained in more detail with reference to the accompanying figures. It should be noted that the invention should not be limited by the stated embodiments. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. Show it:

• 1 a motor vehicle with cooling circuits in a first state; and
• 2 : the cooling circuits after 1 in a second state.

1 shows a motor vehicle 2 with cooling circuits 6 . 7 in a first state.

The car 2 has several electrical components 3 . 4 . 5 for driving the motor vehicle 2 on. The first electrical component 3 is z. B. a power electronics, the second component 4 the electric machine, the third component 5 a (DC-DC) converter. The motor vehicle further comprises a power storage 1 , a first cooling circuit 6 and a second cooling circuit 7 for tempering the electrical components 3 . 4 . 5 and the power storage 1 and a controller 16 for operating the cooling circuits 6 . 7 ,

The first cooling circuit 6 is for tempering the electrical components 3 . 4 . 5 provided, wherein the second cooling circuit 7 for tempering the power storage 1 is provided. The first cooling circuit 6 and the second cooling circuit 7 are for the cooling fluid used 10 fluid technology connectable. The first cooling circuit 6 has a first pump 11 and the second cooling circuit 7 a second pump 12 on.

In step a) of the method, the operation of the motor vehicle takes place 2 and the active temperature control of the electrical components 3 . 4 . 5 over the first cooling circuit 6 and the power storage 1 over the second cooling circuit 7 (first state). In step b), the operation of the motor vehicle 2 set and in step c) the active temperature control of the power storage 1 by using a waste heat of the electrical components 3 . 4 . 5 for heating the power storage 1 over the cooling circuits 6 . 7 continued (second state).

The first cooling circuit 6 includes a first valve 18 through which a heat exchanger 13 during operation of the motor vehicle 2 with the cooling fluid 10 for removing heat from the first cooling circuit 6 is charged. Through the first valve, the heat exchanger 13 over a bypass 14 to be bypassed.

The first cooling circuit 6 is fluidic with a surge tank 17 for the cooling fluid 10 connected.

Next is a second valve 19 provided via the fluidic connection of the first cooling circuit 6 and second cooling circuit 7 is controlled. In step a) are the cooling circuits 6 . 7 separated from each other fluidly, wherein in step c) the cooling circuits 6 . 7 fluidly connected to each other.

The second cooling circuit 7 includes a third valve 20 , about which a heating element 21 for supplying heat to the second cooling circuit 7 is einbindbar. The second cooling circuit 7 further includes a radiator 22 (a chiller) over which the fluid 10 of the second cooling circuit 7 is coolable.

In the first state of the cooling circuits shown here 6 . 7 they are not fluidly connected. About the first cooling circuit 6 become the electrical components 3 . 4 . 5 cooled or tempered while on the second cooling circuit 7 the electricity storage 1 is tempered.

2 shows the cooling circuits 6 . 7 to 1 in a second state, in which the cooling circuits 6 . 7 fluidly connected to each other. On the comments too 1 will be referred.

With the fluidic connection of the cooling circuits 6 . 7 Can by the electrical components 3 . 4 . 5 generated heat can be used without them to the environment 15 leave. About the connection of the cooling circuits 6 . 7 gets the heat of the electrical components 3 . 4 . 5 to the power storage 1 transferred.

In the second state, the cooling fluid 10 according to step c) via a bypass 14 at the heat exchanger 13 passed by. This can be a heat dissipation to an environment 15 the cooling circuits 6 . 7 be reduced.

Furthermore, in step c) thermal insulation of at least parts of the cooling circuits 6 . 7 opposite the environment 15 be strengthened.

A thermal insulation can z. B. by the closing of openings (cooling air openings) can be realized by the otherwise waste heat from the cooling circuits 6 . 7 or from the electrical component 3 . 4 . 5 to the environment 15 is dissipated. For example, the heat exchanger 13 by closing a blind or a roller blind from the surroundings 15 be thermally isolated.

The aim of the process is to keep track of as little heat energy as possible to the environment 15 to give and vice versa as much heat energy to the power storage 1 to transfer. So should not preheat before z. B. a cold start can be realized by the present method, but a reheating of the power storage 1 after adjusting the operation of the motor vehicle 2 respectively.

Step c) can then be terminated when a first temperature 8th of the electricity store 1 a limit temperature 9 of the cooling fluid 10 has achieved that to transport the waste heat of the electrical components 3 . 4 . 5 to the power storage 1 is used. Accordingly, step c) can be terminated when a heat transfer from the cooling fluid 10 to the power storage 1 can no longer take place or can no longer be carried out efficiently (if, for example, an electrical energy that is used for heat transport would be higher than the heat energy that is present on the energy storage device 1 can still be transferred).

LIST OF REFERENCE NUMBERS

1

power storage

2

motor vehicle

3

first component

4

second component

5

third component

6

first cooling circuit

7

second cooling circuit

8th

first temperature

9

limit temperature

10

cooling fluid

11

first pump

12

second pump

13

Heat exchanger

14

bypass

15

Surroundings

16

control unit

17

Reservoirs

18

first valve

19

second valve

20

third valve

21

heating element

22

cooler

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 102007004979 A1 [0004]

Claims (10)

A method for controlling the temperature of a power accumulator (1) of an electrically driven motor vehicle (2), wherein the motor vehicle (2) at least one electrical component (3, 4, 5) for driving the motor vehicle (2), the power storage (1) and at least one cooling circuit (6, 7) for tempering the electrical components (3, 4, 5) and the current memory (1); the method comprising at least the following steps: a) operating the motor vehicle (2) and active temperature control of the electrical component (3, 4, 5) and the current memory (1) via the at least one cooling circuit (6, 7); b) setting the operation of the motor vehicle (2); c) Continuing the active tempering of at least the power accumulator (1) by utilizing a waste heat of the electrical component (3, 4, 5) for heating the power accumulator (1) via the at least one cooling circuit (6, 7). Method according to Claim 1 in which step c) is ended at least when a first temperature (8) of the energy store (1) has reached a limit temperature (9) of a cooling fluid (10) which is used to transport the waste heat of the electrical component (3, 4, 5). towards the power storage (1) is used. Method according to one of the preceding claims, wherein the electrical component (3, 4, 5) is tempered by at least one first cooling circuit (6) and the current memory (1) is tempered by a second cooling circuit (7); wherein at least in step c) the first cooling circuit (6) and the second cooling circuit (7) for the cooling fluid used (10) are fluidly connected. Method according to Claim 3 wherein the first cooling circuit (6) comprises a first pump (11) for conveying the cooling fluid (10) and the second cooling circuit (7) a second pump (12) for conveying the cooling fluid (10); wherein in step c) both pumps (11, 12) are operated to convey the cooling fluid (10). Method according to one of the preceding claims, wherein at least in step c) at least one heat exchanger (13) which is used at least temporarily during step b) for cooling a cooling fluid (10) is at least reduced in terms of its cooling capacity. Method according to Claim 4 , wherein the cooling fluid (10) is passed past the at least one heat exchanger (13) via a bypass (14), at least in step c). Method according to one of the preceding claims, wherein at least in step c) a heat dissipation to an environment (15) of the at least one cooling circuit (6, 7) is reduced. Method according to Claim 7 , wherein at least in step c) a thermal insulation of at least parts of the at least one cooling circuit (6, 7) relative to the environment (15) is enhanced. Motor vehicle (2), at least comprising at least one electrical component (3, 4, 5) for driving the motor vehicle (2), a power accumulator (1), at least one cooling circuit (6, 7) for controlling the temperature of the electrical component (3, 4, 5) and the power accumulator (1) and a control unit (16) at least for operating the at least one cooling circuit (6, 7); wherein the control unit (16) is designed to carry out the method suitable. Motor vehicle (2) according to Claim 9 at least comprising a first cooling circuit (6) for controlling the temperature of the at least one electrical component (3, 4, 5) and a second cooling circuit (7) for controlling the temperature of the current memory (1); wherein the first cooling circuit (6) and the second cooling circuit (7) for the cooling fluid used (10) are fluidly connectable.

Images