DE102020117581A1 - System and method for temperature control of an electrical battery system and / or power electronics - Google Patents

Abstract

The present invention relates, among other things, to a system (100; 200; 300; 400) for controlling the temperature of an electric battery system (21), preferably a traction battery system, and/or power electronics (21) of a motor vehicle (20) driven by an electric motor during a charging process of the battery system (21) by means of a charging station (10). The system (100; 200; 300; 400) comprises a vehicle-side fluid circuit (22) for a motor vehicle (20) for temperature control of the battery system (21) and/or the power electronics (21), and a charging station-side fluid circuit (12) for a charging station (10). The system (100; 200; 300; 400) further comprises a coupling device which is designed to thermally couple the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) during the charging process of the battery system (21), the vehicle-side fluid circuit ( 22) and the charging station-side fluid circuit (12) are fluidically separated in the thermal coupling.

Description

The invention relates to a system and a method for temperature control of an electric battery system and / or power electronics of a motor vehicle driven by an electric motor during a charging process of the battery system by means of a charging station. The invention also relates to a motor vehicle that can be driven by an electric motor and a charging station for charging the motor vehicle, which can be thermally coupled to one another.

In order to protect electrical battery systems, preferably traction battery systems of electric motor-driven vehicles, from damage, e.g. decreasing charging capacities, and to achieve the longest possible service life, it is necessary to keep the temperatures of these battery systems in a certain temperature range.

Charging processes in particular can lead to high levels of heat being generated, depending on the level of the respective charging current. A higher charging current causes an increased power loss, which is converted into heat. Furthermore, the high heat generation can also heat the power electronics electrically connected to the battery systems and potentially damage them.

With the constant further development of the fast charging process for traction battery systems with future charging capacities of up to 4 MW and higher, it is therefore increasingly important to efficiently dissipate the heat generated during charging.

Known concepts provide that a charging station and an electric vehicle are additionally fluidically coupled during a charging process in order to cool the battery system of the electric vehicle with coolant from the charging station.

In document DE 11 2012 003 099 T5 a charging station and an electric vehicle are connected to one another via a connection which comprises both a section for supplying the electrical charge and a section for supplying a coolant. During the charging process, coolant is fed from the charging station into the electric vehicle, passed through internal channels between the cells of the battery, and the heated coolant is then returned to the charging station via the connection.

document DE 44 08 961 C1 describes a method in which the charging station is connected to the vehicle via a cooling water hose connection that is separate from the charging current connection. During the charging process, cooling water from the charging station is passed through a battery-side temperature control fluid line in the vehicle in order to cool the battery.

These known concepts are complex, however, since coolant lines have to be provided both in the charging station and in the vehicle, which are specially designed for cooling the battery system during the charging process. In addition, with a fluidic coupling there is fundamentally the risk of leaks and thus the risk that sufficient cooling capacity cannot be guaranteed.

Furthermore, a fluidic coupling not only requires a certain lead time in order to introduce coolant from the charging station into the motor vehicle and thereby establish a circulation of the coolant in the cooling circuit. After the charging process has ended, it must also be ensured that the heated coolant has been completely returned to the charging station. With regard to the continuous further development of the fast charging process, which leads to a steady reduction in the downtime for a charging process, any additional time required is disadvantageous.

The invention is based on the object of creating an alternative and / or improved system for temperature control of a battery system and / or power electronics of a motor vehicle driven by an electric motor during a charging process. In particular, the task is to establish efficient, safe and simple heat transfer between a motor vehicle and a charging station.

The object is achieved by the features of the independent claims. Advantageous developments are given in the dependent claims and the description.

According to a general aspect of the invention, a system for temperature control, preferably for cooling, of an electric battery system and / or power electronics of a motor vehicle driven by an electric motor is provided during a charging process of the battery system by means of a charging station. The battery system can be a traction battery system. A battery system is generally understood to mean a rechargeable store for electrical energy.

The system comprises a vehicle-side fluid circuit for the motor vehicle for temperature control of the battery system and / or the power electronics, as well as a charging station-side fluid circuit for the charging station. The system further comprises a coupling device that is formed is to thermally couple the vehicle-side fluid circuit and the charging station-side fluid circuit during the charging process of the battery system, wherein the vehicle-side fluid circuit and the charging station-side fluid circuit are fluidically separated in the thermal coupling.

A heat transfer between the vehicle-side fluid circuit and the charging station-side fluid circuit does not advantageously take place by a fluidic coupling, i.e. by fluid exchange, but by a simple thermal coupling and thus by heat conduction or heat transfer between the two closed fluid circuits.

The system according to the invention implements a charging concept, in particular a fast charging concept, for applications in motor vehicles driven by electric motors, in which the heat generated during charging, especially during “fast charging” with high charging powers, can be efficiently dissipated and left on site.

The system according to the invention is thus primarily aimed at efficiently dissipating the heat generated during the charging process from the battery system and / or the power electronics, but is not limited to this. The system can also be used to heat the battery system and / or the power electronics, for example to heat the battery system to a predetermined temperature before the charging process, which can be advantageous in cold ambient temperatures. The system thus makes it possible to dissipate the heat generated during charging and, if necessary, to heat it up at low temperatures in order to protect the battery system and increase its service life.

A vehicle-side fluid circuit is understood to mean a fluid circuit for temperature control of the battery system and / or the power electronics of the motor vehicle, which is intended for installation in the motor vehicle or is built into the motor vehicle. Analogously, a fluid circuit on the charging station side is understood to mean a fluid circuit which is provided for installation in the charging station or is built into the charging station.

The system can furthermore comprise a motor vehicle driven by an electric motor and having the fluid circuit on the vehicle side. The motor vehicle driven by an electric motor can be an electric vehicle (English: Battery Electric Vehicle or BEV) or a plug-in hybrid vehicle (English: Plug-in Hybrid Electric Vehicle or PHEV).

The system can furthermore comprise a charging station, which has the fluid circuit on the charging station side, for charging the battery system of the motor vehicle.

According to a preferred embodiment, the coupling device can comprise at least one heat conducting body. The heat conducting body is made of a material with good thermal conductivity, for example metal. The heat-conducting body is characterized in that it is movably arranged on the motor vehicle and / or the charging station in such a way that the heat-conducting body can be brought into a contact position during the charging process in which the heat-conducting body establishes the thermal coupling of the vehicle-side fluid circuit and the charging-station-side fluid circuit.

The coupling device can be set up to move the at least one heat conducting body into the contact position during the charging process, the heat conducting body being permanently, e.g. firmly, thermally coupled to only one of the two cooling circuits. If the heat-conducting body is permanently thermally coupled to the vehicle-side fluid circuit, the heat-conducting body can be brought into a contact position with the fluid circuit on the charging station side. If the heat-conducting body is permanently thermally coupled to the fluid circuit on the charging station side, the heat-conducting body can be brought into a contact position with the fluid circuit on the vehicle side.

The movable at least one heat conducting body advantageously enables the thermal coupling to be established quickly and easily before the start of or during the charging process, and the thermal coupling to be released quickly and easily after the charging process has ended.

According to a further preferred embodiment, the at least one heat-conducting body can comprise a vehicle-side heat-conducting body and / or a heat-conducting body on the charging station.

The vehicle-side heat conducting body can be integrated into the vehicle-side fluid circuit or be in thermal contact with it. The heat conducting body on the charging station side can be integrated into the fluid circuit on the charging station side or be in thermal contact with it.

If a vehicle-side heat-conducting body and a charging-station-side heat-conducting body are present, the coupling device can be designed to bring the vehicle-side heat-conducting body into contact with the charging-station-side heat conducting body during the charging process. The thermal coupling of the fluid circuit on the vehicle side and the fluid circuit on the charging station side can be achieved by a thermal contact of the vehicle-side heat conducting body and the charging station-side heat conducting body can be established.

The heat conducting body on the vehicle side and / or the heat conducting body on the charging station can be arranged to be movable. The coupling device can be configured to move the vehicle-side heat-conducting body and / or the charging station-side heat-conducting body into a contact position in which thermal contact is established between the vehicle-side heat conducting body and / or the charging station-side heat conducting body. According to a further variant, the coupling device can have a contact sensor which is designed to detect whether the contact position has been reached, the coupling device being designed to automatically move the heat conducting body into the contact position as a function of the sensor signal from the contact sensor. As a result, reliable thermal contact can be achieved if the motor vehicle is in a predetermined charging park position relative to the charging station.

According to one embodiment, the vehicle-side heat conducting body can be arranged on an outside of the motor vehicle, for example a lateral or lower outside of the motor vehicle. The heat conducting body on the charging station side can be arranged such that it can be moved towards the heat conducting body on the vehicle side by means of a lifting device, which enables a structurally advantageous implementation. The lifting device can comprise, by way of example only, an extendable support arm, at the free end of which the heat conducting body on the charging station side is arranged. The support arm can be a telescopic arm.

The heat conducting body on the vehicle side and / or the heat conducting body on the charging station side can be designed in the form of a plate. As an alternative or in addition, the heat conducting body on the vehicle side and / or the heat conducting body on the charging station side can have a contact plate.

In a further embodiment, the vehicle-side fluid circuit can furthermore have a vehicle radiator and / or a first fluid pump.

The vehicle-side fluid circuit can advantageously also be provided for temperature management, i.e. for cooling and / or heating, of the battery system and / or the power electronics in the operating state. For example, the vehicle-side fluid circuit can be a fluid circuit that is already present in the motor vehicle. For example, the fluid circuit can be designed to be operated optionally in a cooling mode and heating mode.

According to a variant, the vehicle-side fluid circuit can furthermore have a bypass line with a valve device for controllably bypassing a sub-line of the vehicle-side fluid circuit, the vehicle cooler being arranged in the sub-line.

The bypass line with the valve device advantageously enables the vehicle radiator to be integrated or removed from the fluid circuit as required. During the charging process, the vehicle cooler can be separated out in order to transfer the substantially entire amounts of heat produced via the coupling device to the fluid circuit on the charging station side. In order to ensure efficient heat dissipation, the vehicle cooler can be reintegrated if necessary, that is, the bypass line is closed by means of the valve device and the sub-line is open when the resulting amounts of heat can no longer be completely transferred through the coupling device to the fluid circuit on the charging station side, for example additional cooling capacity is necessary.

In addition to the vehicle radiator, the first fluid pump can also be arranged in the partial line and a second fluid pump, which is designed for a higher volume flow than the first fluid pump, can be arranged in the bypass line.

During a charging process, in particular a rapid charging process, the battery system generates higher amounts of heat than in the operating state. The second fluid pump is therefore advantageously dimensioned for volume flows that can enable the required cooling capacity during the charging process. In a normal driving operation, however, the more efficient first fluid pump can be used, so that overall an energy-efficient operation of the motor vehicle is made possible.

In one embodiment, the system according to the invention can be designed to open the bypass line by means of the valve device during the charging process of the battery system and to close the partial line.

According to a further variant, the vehicle-side fluid circuit can comprise two fluidically separate sub-circuits, namely a first sub-circuit and a second sub-circuit. In this variant, the vehicle radiator and the first fluid pump are arranged in the first partial circuit. In addition, a second fluid pump, which is designed for a higher volume flow than the first fluid pump, is arranged in the second sub-circuit, only the second sub-circuit of the two sub-circuits being directly thermally connected to the Coupling device is coupled and / or can be coupled.

The second sub-circuit is thus designed exclusively to control the temperature of the battery system and / or the power electronics during the charging process. The temperature management of the battery system and / or the power electronics in the operating state of the motor vehicle takes place via an independent first partial circuit. Advantageously, switching over of a valve device is not necessary here and the second sub-circuit can also be designed to be optimized for temperature control during the charging process, in particular for effective heat dissipation during rapid charging processes.

The first partial circuit can have a dielectric fluid as a temperature control means, preferably for side surface temperature control of cells of the battery system.

According to a further embodiment, the system can be designed to send a control signal for controlling the vehicle cooler to the motor vehicle during the charging process. The system can preferably be designed to send the control signal to the motor vehicle after a predetermined time after the start of the charging process in order to activate the vehicle radiator.

The system can thus advantageously activate the vehicle cooler if additional cooling is required during the charging process.

In a further embodiment, the system can also have a charging interface for electrically connecting the charging station to the motor vehicle when charging the battery system, with a communication interface in the charging interface for data exchange between the charging station and the motor vehicle, e.g. an on-board diagnosis, OBD interface, be integrated. In particular, the charging station can be designed to send the control signal to the motor vehicle via the communication interface.

The system, in particular the charging station, can also be designed to send a coupling device control signal via the communication interface to the motor vehicle or the coupling device in order to move the vehicle-side heat conducting body into the contact position. The system, in particular the charging station, can also be designed to send a fluid circuit control signal via the communication interface to the motor vehicle in order to control the first fluid pump and / or the second fluid pump and / or the valve device of the vehicle-side fluid circuit.

The system can advantageously control the temperature during the charging process at least partially via the charging station. The entire control can be carried out particularly advantageously by the charging station while the motor vehicle is in the idle state, i.e. in the parked state.

In a further embodiment, the fluid circuit on the charging station side can furthermore have a heat store and / or an energy converter.

A sustainable charging concept, in particular a fast charging concept, is advantageously implemented for applications in motor vehicles driven by electric motors, in which the heat generated during charging can be efficiently dissipated, left on site and used sustainably. The "left behind waste heat" can be used, for example, for heating a restaurant and or through reconversion, similar to a system for waste heat recovery (Waste Heat Recovery system or WHR system). It is also conceivable that the charging station includes an integrated billing system so that the driver of the motor vehicle receives a reward for the “waste heat left behind” via a bonus system or a reduction in charging electricity costs.

Another general aspect of the invention provides a motor vehicle that can be driven by an electric motor, preferably a utility vehicle, for a system according to the invention as disclosed herein. The motor vehicle comprises an electrical battery system, a fluid circuit and a coupling device. The fluid circuit can have the features of the vehicle-side fluid circuit according to a system as disclosed herein. In other words, the fluid circuit of the motor vehicle can optionally have the two sub-circuits, the first and second fluid pumps etc. as described above.

The coupling device is designed to thermally couple the vehicle-side fluid circuit with a charging station-side fluid circuit during the charging process of the battery system, the vehicle-side fluid circuit and the charging station-side fluid circuit being fluidically separated during the thermal coupling. The coupling device of the motor vehicle forms the vehicle-side part of the coupling device according to a system as disclosed herein.

Another general aspect of the invention provides a charging station for a system according to the invention as disclosed herein. The charging station comprises a fluid circuit having the features of a charging station-side fluid circuit according to a system as disclosed herein. Drawer station further comprises a coupling device which is designed to thermally couple the charging station-side fluid circuit with a vehicle-side fluid circuit during the charging process, the vehicle-side fluid circuit and the charging station-side fluid circuit being fluidically separated during the thermal coupling. The coupling device preferably forms the part of the coupling device on the charging station side according to a system as disclosed herein.

Another general aspect of the invention provides a method for temperature control of an electrical battery system, preferably a traction battery system, and / or power electronics of a motor vehicle driven by an electric motor during a charging process of the battery system by means of a charging station.

The method includes providing a coupling device which is designed to thermally couple a vehicle-side fluid circuit and a charging station-side fluid circuit during the charging process of the battery system, the vehicle-side fluid circuit and the charging station-side fluid circuit being fluidically separated during the thermal coupling. The method also includes an electrical connection of the charging station and the motor vehicle via a charging interface. In a further step, the method also includes establishing a thermal coupling of the vehicle-side fluid circuit of the motor vehicle and the charging station-side fluid circuit of the charging station during the charging process of the battery system by means of the coupling device.

To avoid repetition, features disclosed purely in accordance with the system should also apply and be claimable as disclosed in accordance with the method. The aforementioned aspects and features according to the invention, in particular with regard to the design of the cooling circuits and the coupling device, thus also apply to the method.

• 1 eine schematische Darstellung eines Systems gemäß einer ersten Ausführungsform der Erfindung;
• 2 eine schematische Darstellung eines Systems gemäß einer zweiten Ausführungsform der Erfindung;
• 3 eine schematische Darstellung eines Systems gemäß einer dritten Ausführungsform der Erfindung;
• 4 eine schematische Darstellung eines Systems gemäß einer vierten Ausführungsform der Erfindung;
• 5 eine schematische Außensicht eines Kraftfahrzeugs und einer Ladestation gemäß einer Ausführungsform der Erfindung; und
• 6 ein Verfahren gemäß einer Ausführungsform der Erfindung.

The embodiments, variants and features of the invention described above can be combined with one another as desired. Further details and advantages of the invention are described below with reference to the accompanying drawings. Show it:

• 1 a schematic representation of a system according to a first embodiment of the invention;
• 2 a schematic representation of a system according to a second embodiment of the invention;
• 3 a schematic representation of a system according to a third embodiment of the invention;
• 4th a schematic representation of a system according to a fourth embodiment of the invention;
• 5 a schematic external view of a motor vehicle and a charging station according to an embodiment of the invention; and
• 6th a method according to an embodiment of the invention.

Identical or functionally equivalent elements are denoted by the same reference symbols in all figures and in some cases are not described separately. For example, the reference number 22 in all embodiments of FIG 1 until 4th the vehicle-side fluid circuit, which is designed differently depending on the embodiment and variant.

1 shows schematically a system 100 according to the invention according to a first embodiment.

The system 100 comprises two fluid circuits: a vehicle-side fluid circuit 22 for a motor vehicle 20 driven by an electric motor to control the temperature of a battery system 21 and / or power electronics 21, and a charging station-side fluid circuit 12 for a charging station 10. The motor vehicle and the charging station are only strongly schematized here by the dashed and dotted lines 20 and 10 are shown.

The vehicle-side fluid circuit 22 is part of the motor vehicle 20 and is integrated into it. Similarly, the fluid circuit 12 on the charging station side is assigned to a component of the charging station 10 or the charging station 10. The motor vehicle 20 and the charging station 10 can be included in the system 100 according to the invention. The charging station can furthermore comprise a charging column 11, which provides the electrical energy for charging the battery system. The charging column 11 can have a charging connection for a charging cable and / or a charging cable in a manner known per se to form a charging interface 16, the free end of which can be connected to the charging connection of the electric vehicle by means of a contact element, and also an electronic charging controller for controlling the charging process after connection of an electric vehicle at the charging station.

The system 100 further comprises a coupling device which is designed to thermally couple the vehicle-side fluid circuit 22 and the charging station-side fluid circuit 12 during the charging process of the battery system 21, wherein the vehicle-side fluid circuit 22 and the charging station-side fluid circuit 12 are fluidically separated in the thermal coupling.

In the embodiment shown, the coupling device of the system 100 comprises two heat-conducting bodies: a vehicle-side heat-conducting body 23, which is integrated into the vehicle-side fluid circuit 22 or is in thermal contact with it, and a charging station-side heat conducting body 13 which is integrated into the charging station-side fluid circuit 12 or with this is in thermal contact. To produce the thermal coupling, the coupling device is designed to bring the vehicle-side heat-conducting body 23 into contact with the charging-station-side heat conducting body 13 during the charging process. For this purpose, at least one of the heat conductors 13, 23 is movably arranged on the motor vehicle 20 or the charging station 10 in such a way that the heat conductors 13, 23 can be brought into a contact position during the charging process in which the heat conductors 13, 23 provide the thermal coupling of the vehicle-side fluid circuit 22 and the charging station-side Fluid circuit 12 produces.

The thermal coupling of the vehicle-side fluid circuit and the charging station-side fluid circuit can be established by thermal contact of a side surface 23A of the vehicle-side heat-conducting body 23 and a side surface 13A of the charging-station-side heat conducting body 23.

The fluid circuit 12 on the charging station side also has a heat store 14 and / or an energy converter 14. The fluid circuit 12 on the charging station side can furthermore have a fluid pump 15.

The vehicle-side fluid circuit 22 also has a vehicle radiator 24 and a first fluid pump 25. The vehicle radiator 24 may include an electric fan 24A, which is used to supply the vehicle radiator 24 with a sufficient flow of cooling air. The fan can be controlled in a manner known per se by a control device on the vehicle, i.e. it can be switched on and off depending on the operating state of the motor vehicle.

The system 100 also has the charging interface 16 for electrically connecting the charging station 10 to the motor vehicle 20 when charging the battery system 21. A communication interface 17 can be integrated into the charging interface 16, which is designed, for example, as an on-board diagnosis, OBD interface. The communication interface is used to exchange data between the charging station 10 and the motor vehicle 20. Furthermore, the system 100, in particular the charging station 10, can be designed to send a control signal to the vehicle cooler 24 via the communication interface 17 to the motor vehicle 20 during the charging process. For example, after a predetermined time after the start of the charging process, a control signal can be sent in order to activate the vehicle radiator 24. Alternatively or additionally, the charging station 10 can also be designed to send a control signal for controlling the fan 24A to the motor vehicle 20 via the communication interface 17 during the charging process.

This in 2 System 200 shown schematically according to a second embodiment provides, compared to system 100, that the vehicle-side fluid circuit 22 furthermore has a bypass line 26 with a valve device 27. The bypass line 26 with the valve device 27 is used to controllably bypass a subline of the vehicle-side fluid circuit 22, the vehicle radiator 24 being arranged in the subline.

The system 200 is designed to open the bypass line 26 by means of the valve device 27 during the charging process of the battery system 21 and to close the partial line. For this purpose, the motor vehicle preferably has a control device (not shown) which is appropriately designed to control the valve device 27 during the charging process.

This in 3 The schematically illustrated system 300 according to a third embodiment provides, compared to system 200, that, in addition to the vehicle radiator 24, the first fluid pump 25 is also arranged in the sub-line. Furthermore, a second fluid pump 28, which is designed for a higher volume flow than the first fluid pump 25, is arranged in the bypass line 26.

4th schematically shows a system 400 according to the invention in accordance with a fourth embodiment.

In this system 400, the vehicle-side fluid circuit comprises two fluidically separate sub-circuits, a first sub-circuit 22A and a second sub-circuit 22B.

The vehicle radiator 24 and the first fluid pump 25 are arranged in the first sub-circuit 22A. The second fluid pump 28, which is designed for a higher volume flow than the first fluid pump 25, is arranged in the second sub-circuit 22B. Only the second sub-circuit 22B is directly thermally coupled and / or can be coupled to the coupling device.

5 shows schematically a motor vehicle 20 that can be driven by an electric motor and a charging station 10 according to one embodiment.

The motor vehicle 20 and the charging station 10 are connected to one another via the charging interface 16. A communication interface 17 can be integrated in the charging interface 16.

The motor vehicle 20 comprises a coupling device which forms the vehicle-side part of the coupling device. The vehicle-side part of the coupling device comprises the vehicle-side heat conducting body 23, which is arranged on a lower outer side of the motor vehicle 20.

The charging station 10 comprises a coupling device which forms the part of the coupling device on the charging station side. The part of the coupling device on the charging station side comprises the heat conducting body 13 on the charging station side, which is arranged to be movable towards the heat conducting body 23 on the vehicle side by means of a lifting device 18. For example, the heat conducting body 13 on the charging station side can be arranged in a bottom opening of the charging station 10 and can be moved vertically upwards in order to bring the heat conducting body 13 on the charging station into a contact position with the heat conducting body 23 on the vehicle side and thus establish the thermal coupling.

The vehicle-side heat conducting body 23 and the charging station-side heat conducting body 13 can be designed in the form of a plate and / or have a contact plate.

An exemplary sequence of a method 600 according to an embodiment of the invention is illustrated on the basis of FIG 6th with reference to the 1 and 5 described.

In step S1, the method 600 provides for the provision of the coupling device, which is designed to thermally couple the vehicle-side fluid circuit 22 and the charging station-side fluid circuit 12 during the charging process of the battery system 21, the vehicle-side fluid circuit 22 and the charging station-side fluid circuit 12 being thermally coupled are fluidically separated.

For this purpose, the motor vehicle 20 is first parked in a predetermined charging parking position relative to the charging station 10, so that reliable thermal contact can be established between the vehicle-side heat conducting body 23 and the charging station-side heat conducting body 13. For example, the charging station can have a marking which indicates the charging park position.

In this charging park position, the vehicle-side heat conducting body 23 is located above the floor opening of the charging station 10, in which the charging station-side heat conducting body 13 is arranged.

In step S2, the charging station 10 and the motor vehicle 20 are electrically connected via the charging interface 16.

In the third step S3, the thermal coupling of the vehicle-side fluid circuit 22 of the motor vehicle 20 and the charging station-side fluid circuit 12 of the charging station 10 is established during the charging process of the battery system 21.

To this end, the system 100 sends a control signal to the lifting device 18 in order to move the heat conducting body 13 on the charging station vertically upwards until the heat conducting body 13 on the charging station is brought into a contact position with the heat conducting body 23 on the vehicle. The transmission of the control signal can be triggered, for example, when the electrical connection has been made in accordance with step S2 or when the system 100 detects, by means of a suitable sensor system, that the motor vehicle 20 is in the predetermined charging position.

After the charging station 10 and the motor vehicle 20 are electrically connected and the thermal coupling has been established, the charging process is started by the system 100. Simultaneously or after a predetermined charging period, the fluid pump 25 in the vehicle-side fluid circuit 22 and the fluid pump 15 in the charging station-side fluid circuit 12 are operated by the system 100, e.g. B. activated by a vehicle-side control device for controlling the fluid circuit 22 and thus started the active cooling of the battery system 21.

The circulating temperature control fluid of the vehicle-side fluid circuit 22 now steadily absorbs the amount of heat generated by the battery system 21 and primarily transfers this amount of heat to the vehicle-side heat conducting body 23. If an increased cooling capacity is required, the temperature control fluid can also be passed through the vehicle radiator 24, which is triggered by a control signal of the system 100 can be activated, be cooled.

Via the thermal coupling, the amounts of heat are transferred from the vehicle-side heat-conducting body 23 to the charging-station-side heat-conducting body 13, with the charging-station-side heat conducting body 13 being heated. The circulating temperature control fluid of the fluid circuit 12 on the charging station side, in turn, cools the heat conducting body 13 on the charging station side by absorbing the transferred amounts of heat and returning it to the storage unit cher and / or energy converter 14 emits. The charging station-side fluid circuit 12 is designed in such a way that it always ensures sufficient cooling of the charging station-side heat conducting body 13, so that the heat transfer between the vehicle-side heat conducting body 23 and the charging station-side heat conducting body 13 can take place by conduction.

By means of the storage unit and / or energy converter 14, the amounts of heat can be left on site and further used in a sustainable manner. The memory 14 can be designed to store the amounts of heat and, for example, to transfer them to devices outside of the system 100 that can be connected to the memory 14. For example, the stored amounts of heat can be used to heat neighboring buildings. The energy converter 14 can be, for example, a thermoelectric generator that converts the amounts of heat into electrical energy. This electrical energy can be stored and used, for example, to operate the charging station 10 and / or the system 100.

After the charging process has ended, the system 100 sends control signals to the two fluid pumps 15 and 25 in order to deactivate them. In addition, the thermal coupling is released again in that the system 100 sends a control signal to the lifting device 18 in order to move the heat conducting body 13 on the charging station side back into its starting position within the bottom opening of the charging station 10.

The invention is not restricted to the preferred embodiments described above. Rather, a large number of variants and modifications are possible which also make use of the inventive concept and therefore fall within the scope of protection. In particular, the invention also claims protection for the subject matter and the features of the subclaims independently of the claims referred to. In particular, the individual features of independent claim 1 are disclosed independently of one another. In addition, the features of the subclaims are also disclosed independently of all the features of independent claim 1.

List of reference symbols

10

Charging station

11th

Charging station

12th

Fluid circuit on the charging station side

13th

Thermal conductor on the charging station side

13A

Side surface of the heat conducting body on the charging station side

14th

Heat storage and / or an energy converter

15th

Fluid pump (in the fluid circuit on the charging station side)

16

Charging interface

17th

Communication interface

18th

Lifting device

20th

motor vehicle driven by an electric motor

21

electrical battery system and / or power electronics

22nd

vehicle-side fluid circuit

22A

first partial cycle

22B

second partial cycle

23

vehicle-side thermal conductor

23A

Side surface of the vehicle-side heat conducting body

24

Vehicle radiator

24A

electric fan

25th

first fluid pump (in the vehicle's fluid circuit)

26th

Bypass line

27

Valve device

28

second fluid pump (in the vehicle's fluid circuit)

100, 200, 300, 400

system

500

proceedings

S1, S2, S3

Process step

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 112012003099 T5 [0006]
• DE 4408961 C1 [0007]

Claims (16)

System (100; 200; 300; 400) for temperature control of an electrical battery system (21), preferably a traction battery system, and / or power electronics (21) of an electric motor-driven motor vehicle (20) during a charging process of the battery system (21) by means of a charging station ( 10), the system comprising: a) a vehicle-side fluid circuit (22) for a motor vehicle (20) for temperature control of the battery system (21) and / or the power electronics (21); b) a charging station-side fluid circuit (12) for a charging station (10); and c) a coupling device which is designed to thermally couple the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) during the charging process of the battery system (21), the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) in the thermal coupling are fluidically separated. System (100; 200; 300; 400) according to Claim 1 , further comprising a) a motor vehicle (20) which is driven by an electric motor and has the vehicle-side fluid circuit (22); b) a charging station (10) having the fluid circuit (12) on the charging station side for charging the battery system (21) of the motor vehicle (20); c) wherein the coupling device comprises at least one heat conducting body (13, 23) which is movably arranged on the motor vehicle (20) and / or the charging station (10) in such a way that the heat conducting body (13, 23) can be brought into a contact position during the charging process, in which the heat conducting body (13, 23) produces the thermal coupling of the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12). System (100; 200; 300; 400) according to Claim 2 , wherein the at least one heat conducting body (13, 23) comprises: a1) a vehicle-side heat conducting body (23) which is integrated into the vehicle-side fluid circuit (22) or is in thermal contact with it, and a2) a heat conducting body (13) on the charging station side, which is integrated into the charging station-side fluid circuit (12) or is in thermal contact with it, and b) wherein the coupling device is designed to bring the vehicle-side heat conducting body (23) into contact with the charging station-side heat conducting body (13) during the charging process. System (100; 200; 300; 400) according to Claim 3 wherein a) the vehicle-side heat conducting body (23) is arranged on an outside of the motor vehicle (20), preferably a lateral or lower outside of the motor vehicle (20); and b) the heat conducting body (13) on the charging station side is arranged to be movable towards the heat conducting body (23) on the vehicle side by means of a lifting device (18). System according to Claim 3 or 4th , wherein the vehicle-side heat conducting body (23) and / or the charging station-side heat conducting body (13) are plate-shaped and / or have a contact plate. System (100, 200, 300) according to one of the preceding claims, wherein the vehicle-side fluid circuit (22) further comprises a vehicle cooler (24) and / or a first fluid pump (25). System (200, 300) according to Claim 6 , wherein the vehicle-side fluid circuit (22) also has a bypass line (26) with a valve device (27) for controllably bypassing a sub-line of the vehicle-side fluid circuit (22), the vehicle cooler (24) being arranged in the sub-line. System (300) according to Claim 7 , wherein the first fluid pump (25) is arranged in the partial line and a second fluid pump (28), which is designed for a higher volume flow than the first fluid pump (25), is arranged in the bypass line (26). System (200, 300) according to Claim 7 or 8th which is designed to open the bypass line (26) by means of the valve device (27) during the charging process of the battery system (21) and to close the partial line. System (400) according to Claim 6 , wherein the vehicle-side fluid circuit (22) comprises two fluidically separate sub-circuits (22A, 22B), the vehicle radiator (24) and the first fluid pump (25) are arranged in a first sub-circuit (22A), and a second fluid pump (28) which is designed for a higher volume flow than the first fluid pump (25), is arranged in a second sub-circuit (22B), of the two sub-circuits (22, A 22B) only the second sub-circuit (22B) is directly thermally coupled to the coupling device and / or can be coupled. System (100; 200; 300; 400) according to one of the Claims 6 until 10 , which is designed to send a control signal for controlling the vehicle cooler (24) to the motor vehicle (20) during the charging process, preferably to send it after a predetermined time after the start of the charging process, in order to activate the vehicle cooler (24). System (100; 200; 300; 400) according to Claim 11 , further comprising a charging interface (16) for electrically connecting the charging station (10) to the motor vehicle (20) when charging the battery system (21), a communication interface (17), for example an OBD interface, being integrated into the charging interface (16) is, and the charging station (10) is designed to send the control signal via the communication interface (17) to the motor vehicle (20). System (100; 200; 300; 400) according to one of the preceding claims, wherein the fluid circuit (12) on the charging station side also has a heat store (14) and / or an energy converter (14). Motor vehicle (20), preferably a utility vehicle, which can be driven by an electric motor, for a system (100; 200; 300; 400) according to one of the Claims 1 until 13th comprising a) an electrical battery system (21); b) a fluid circuit (22) having the features of a vehicle-side fluid circuit (22) according to a system (100; 200; 300; 400) of Claims 1 until 13th ; and c) a coupling device which is designed to thermally couple the vehicle-side fluid circuit (22) to a charging station-side fluid circuit (12) during the charging process of the battery system (21), the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) at the thermal coupling are fluidically separated, the coupling device preferably the vehicle-side part of the coupling device according to a system (100; 200; 300; 400) of Claims 1 until 13th trains. Charging station (10) for a system (100; 200; 300; 400) according to one of the Claims 1 until 13th , comprising a) a fluid circuit (12) having the features of a charging station-side fluid circuit (12) according to a system (100; 200; 300; 400) of Claims 1 until 13th , b) a coupling device which is designed to thermally couple the charging station-side fluid circuit (12) to a vehicle-side fluid circuit (22) during the charging process, the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) being fluidically separated during the thermal coupling are, wherein the coupling device is preferably the charging station-side part of the coupling device according to a system (100; 200; 300; 400) of Claims 1 until 13th trains. Method (500) for controlling the temperature of an electric battery system (21), preferably a traction battery system, and / or power electronics (21) of a motor vehicle (20) that can be driven by an electric motor during a charging process of the battery system (21) by means of a charging station (10), the method having : a) Provision of a coupling device which is designed to thermally couple a vehicle-side fluid circuit (22) and a charging station-side fluid circuit (12) during the charging process of the battery system (21), the vehicle-side fluid circuit (22) and the charging station-side fluid circuit (12) at the thermal coupling are fluidically separated; b) electrical connection of the charging station (10) and the motor vehicle (20) via a charging interface (16); and c) Establishing a thermal coupling of the vehicle-side fluid circuit (22) of the motor vehicle (20) and the charging station-side fluid circuit (12) of the charging station (10) during the charging process of the battery system (21) by means of the coupling device.

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