Method, temperature control device, and computer program product for controlling a temperature control device during charging of a drive battery of an electric vehicle

Abstract

The invention relates to a method for controlling a temperature control device (12) during the charging process of a drive battery (10) of an electric vehicle (11), comprising the following steps: charging the drive battery (10) and cooling the drive battery (10) during charging by means of the temperature control device (12), wherein the temperature control device (12) comprises a heat exchanger (13) with a hot side (14) and a cold side (15), the hot side (14) being designed as part of a battery circuit (16) for conveying a temperature control fluid to the drive battery (10), and the cold side (15) being designed as part of a cooling circuit (17) for conveying a cooling fluid through the cold side (15), wherein the temperature of the heat exchanger (13) is increased after the drive battery (10) has been charged. The invention also relates to a temperature control device (12) and a computer program product (23) for implementing the method according to the invention.

Description

Technical Field

[0001] The present invention relates to a method for controlling a temperature control device during the charging process of a drive battery of an electric vehicle. The invention also relates to a temperature control device for controlling the temperature, in particular cooling the drive battery, during the charging process, a computer program product, and a storage device on which the computer program product is stored. Background Art

[0002] Various systems for charging the drive battery in electric vehicles are known in the prior art. In addition to charging systems with normal charging speeds, there are also so-called rapid charging systems. When rapidly charging the drive battery using high charging power, high temperatures may occur in and on the drive battery. To prevent this, the drive battery can be cooled by an external or separate cooling system during the rapid charging process. Such a system and a related method for charging the battery of an electric vehicle can be found in DE 11 2012 003 109 T5. This type of external cooling system includes a heat exchanger through which the temperature of the temperature control medium in the battery circuit is transferred to the coolant in the cooling circuit of the external cooling system. To prevent clogging and / or biofilm formation in the coolant or refrigerant of the external cooling system, the cooling water used as the coolant is provided with suitable chemicals. A disadvantage of using such coolants is that water-repellent treatment must be taken into account when removing the coolant, and this is therefore quite complex. In contrast, if simple water is used as coolant, the above-mentioned fouling and / or biofilm formation in the cooling lines may lead to a reduction in heat transfer and pressure losses in the cooling lines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to take the aforementioned problems into account at least in part. In particular, the technical problem to be solved by the present invention is to provide a method for controlling a temperature control device and a corresponding temperature control device, by means of which the formation of fouling and / or biofilm in a heat exchanger and / or in a cooling line extending through the heat exchanger can be prevented in a manner that is as simple and inexpensive as possible.

[0004] The aforementioned technical problem is solved by a method, a temperature control device, a computer program product, and a storage device for controlling a temperature control device during the charging process of a drive battery of an electric vehicle. Features described in conjunction with the method are of course also applicable to features described in conjunction with the temperature control device, the computer program product, and the storage device according to the invention, and vice versa. Therefore, the disclosure of the various aspects of the invention always refers to and / or can refer to each other.

[0005] According to a first aspect of the present invention, a method for controlling a temperature control device during charging of a drive battery of an electric vehicle is provided. The method comprises the following steps:

[0006] - Charge the drive battery, and

[0007] - cooling the drive battery during charging by means of a temperature control device, wherein the temperature control device comprises a heat exchanger with a hot side and a cold side, the hot side being designed as part of a battery circuit for conveying a temperature control fluid to the drive battery, and the cold side being designed as part of a cooling circuit for conveying a cooling fluid through the cold side, wherein

[0008] - Actively increases the temperature of the heat exchanger after charging the drive battery.

[0009] The present invention recognizes that residual moisture on the cold side of a heat exchanger can be removed simply and effectively, particularly by increasing or heating the heat exchanger after the charging process. Accordingly, the temperature of the heat exchanger is actively increased after charging the drive battery, particularly to remove moisture from the cold side. This, of course, presupposes that no cooling fluid or refrigerant is present in the cooling circuit or on the cold side of the heat exchanger. The measures for implementing this method can be implemented simply and cost-effectively in existing vehicles.

[0010] Actively increasing the temperature of the heat exchanger after the drive battery is charged should be understood in particular to mean actively increasing the temperature of the heat exchanger by means of active measures and / or correspondingly configured temperature increasing devices. Actively increasing the temperature of the heat exchanger should in particular not be understood to mean a temperature increase that inevitably occurs after the drive battery has cooled due to the temperature adjustment to the ambient temperature. The temperature of the heat exchanger can be actively increased in different ways, for example by heating the fluid in the heat exchanger, i.e. actively increasing it on the hot side and / or the cold side, and by means of a heating device external to the heat exchanger that transfers heat to the heat exchanger. Preferably, the temperature is increased after the drive battery is charged, i.e. immediately after charging.

[0011] Actively increasing the temperature of the heat exchanger can be understood as actively heating or warming the heat exchanger or at least a part of the heat exchanger, for example, the hot side of the heat exchanger or the cold side of the heat exchanger. In principle, the heat exchanger is used for heat transfer or heat removal during charging of the drive battery, and the temperature control fluid is hotter than the cooling fluid. The cold side can be designed and configured accordingly as part of a cooling circuit for guiding the cooling fluid to cool the temperature control fluid during charging. However, after charging the drive battery, the heat exchanger can perform a new function, namely depending on how the heat exchanger is heated. If the temperature is increased, for example, by a heating fluid on the cold side of the heat exchanger, then heat can be transferred from the cold side to the hot side in the heat exchanger.

[0012] Active temperature increases and / or heating of the heat exchanger can be initiated by the electric vehicle's control unit and / or by the control unit of a charging column or a charging unit located outside the electric vehicle for charging the drive battery. In other words, the heating measures for increasing the temperature of the heat exchanger can be taken over by the external charging unit. This saves components in the electric vehicle, thereby reducing weight and costs. Furthermore, an external charging unit, for example in the form of a charging column, can provide heating power that is not available, or at least impractical, in the electric vehicle.

[0013] A vehicle battery is understood to be, in particular, a traction battery or a high-voltage battery provided for driving the vehicle. The described method is particularly implemented for charging the drive battery of an electric vehicle, such as a pure electric vehicle or a hybrid vehicle. The method can also be implemented and / or provided for charging processes in other electrical systems having batteries similar to the drive battery. According to the present invention, the charging process includes not only charging the drive battery but also, in particular, the period after the drive battery is charged, during which the heat exchanger is heated in the manner according to the present invention to remove residual water from the heat exchanger. Therefore, the method can also be understood as a method for influencing the temperature of components in a temperature control system, and in particular, for influencing the temperature of the heat exchanger of the temperature control system after the drive battery is charged. A temperature control fluid can be understood as a cooling medium and / or coolant used to cool the drive battery while the electric vehicle is in motion. A cooling fluid can be understood as a refrigerant. Depending on the operating state of the temperature control system, the hot side can also be understood as the cold side or the relatively cold side, and the cold side can also be understood as the hot side or the relatively hot side.

[0014] According to another embodiment of the present invention, it is possible to conduct a heating fluid through the cold side during the method for increasing the temperature of the heat exchanger. The heating fluid is, in particular, ambient air, preferably hot air heated to above ambient temperature. Experiments within the scope of the present invention have shown that this is a particularly simple, effective, and inexpensive method for removing residual moisture from the cold side of a heat exchanger. In other words, by conducting ambient air and / or hot air through the cold side of the heat exchanger, any water remaining in the heat exchanger after a rapid charge can be quickly evaporated and / or escaped. This prevents or at least reduces the formation of biofilm in the heat exchanger.

[0015] Furthermore, in the method according to the present invention, it is possible to arrange a heat exchanger heater on the heat exchanger and to heat the heat exchanger via the heat exchanger heater after charging the drive battery. This solution represents a particularly easy-to-implement measure for increasing the temperature of the heat exchanger as desired. The heat exchanger heater can be retrofitted into existing systems with particular ease. For example, the heat exchanger heater can be installed directly on the heat exchanger or at least in close proximity to the heat exchanger to enable desired temperature control of the heat exchanger in and / or on the electric vehicle. The heat exchanger heater can be configured as an electric heater or a heating fan. The heat exchanger heater can be arranged on the hot side of the heat exchanger, in particular directly on the hot side and / or the cold side of the heat exchanger. The method should preferably be implemented such that the heat exchanger heater heats only the heat exchanger, or primarily or initially. In other words, the heat exchanger heater is preferably configured to dissipate the majority of the heat energy from the heat exchanger heater into the heat exchanger. For this purpose, the heat exchanger heating device is preferably provided outside the battery circuit and outside the coolant line. Thus, the heating of the heat exchanger can be carried out in a correspondingly energy-saving manner.

[0016] Furthermore, in the method according to the invention, it is possible to arrange a temperature-control fluid heating device upstream of the hot side in the battery circuit, and to heat the temperature-control fluid by means of the temperature-control fluid heating device in order to increase the temperature of the heat exchanger. The temperature-control fluid heating device can in particular be provided in the form of a temperature-control medium, which in electric vehicles of this type is originally designed to control the temperature of the temperature-control fluid and, therefore, the temperature of the drive battery. According to the invention, the temperature-control fluid heating device can now be controlled so as to heat the temperature-control fluid after charging so that the temperature of the heat exchanger is raised to the desired value. The battery circuit can be understood as a fluid circuit for recirculating the temperature-control fluid through the drive battery and / or to the drive battery, away from the drive battery, and back again to the drive battery. During the temperature-control of the drive battery by the temperature-control medium, the position upstream of the heat exchanger should be understood in particular with reference to the flow direction of the temperature-control medium.

[0017] Furthermore, in the method according to the present invention, it is possible to convey the temperature-control fluid heated by the temperature-control fluid heater through the hot side to heat the heat exchanger at a flow rate that is lower than the flow rate of the temperature-control fluid during a predefined temperature control of the drive battery by the temperature-control fluid, i.e., for example, during charging of the drive battery. In other words, the flow rate during the temperature increase of the heat exchanger after rapid charging should be as low as possible and therefore lower than the flow rate during normal operation of the heat exchanger, such as during charging of the drive battery. This prevents overheated temperature-control fluid from reaching the drive battery during the heat exchanger temperature increase and causing damage there due to an excessive temperature difference between the drive battery and the temperature of the temperature-control fluid. The heat exchanger should be arranged upstream of the drive battery with respect to the flow direction of the temperature-control fluid, and the temperature-control fluid heater should be arranged upstream of the hot side of the heat exchanger. Predefined or predefinable temperature control is understood, in particular, to mean targeted or intentional temperature control of the drive battery during charging of the drive battery and / or during driving operation of the electric vehicle.

[0018] According to another design variant of the present invention, it is possible for the battery circuit to include a bypass for routing a temperature-control fluid past the drive battery. The temperature-control fluid is routed past the drive battery through the bypass while the heat exchanger is being heated by the heated temperature-control fluid. This reliably prevents overheated temperature-control fluid from reaching the drive battery while the heat exchanger is warming up and potentially damaging the drive battery there due to an excessively high temperature difference between the drive battery and the temperature of the temperature-control fluid. The temperature-control medium in the battery circuit can be conveyed through the bypass, which is designed using suitable switching elements, particularly valves, so that the temperature-control medium does not reach the drive battery during operation to increase the temperature of the heat exchanger.

[0019] Furthermore, the method according to the present invention makes it possible to increase the temperature of the heat exchanger in the electric vehicle when the electric vehicle is stationary, in particular only when the electric vehicle is stationary and / or when the drive battery does not output any current and / or voltage to drive the electric vehicle. This means that the temperature of the heat exchanger in the electric vehicle is increased as much as possible only when the electric vehicle is not running. This prevents the thermal management of the drive battery from being affected and thus causing damage to the drive battery and / or the electric vehicle. The method is particularly preferably performed when the electric vehicle is connected to a charging device for charging the drive battery, so that the heating energy does not affect the driving range and / or charge state of the drive battery.

[0020] It may also be advantageous, in the method according to the present invention, to provide a valve downstream of the cold side of the cooling circuit for discharging the heating fluid into the surrounding environment of the cooling circuit, and to discharge the heating fluid into the surrounding environment of the cooling circuit via the valve. The valve allows ventilation and / or exhaust of the heat exchanger on the cold side while the heat exchanger's temperature is rising. Furthermore, the cooling fluid can be directed through the valve during charging of the drive battery. To this end, the valve can be designed as a two-way valve, wherein the cooling fluid can be directed through the valve during charging, and after charging and while the heat exchanger's temperature is being raised by the aforementioned air or hot air, the air or hot air can be directed through or past the valve into the surrounding environment of the cooling circuit and / or the surrounding environment of the temperature control device. The use of the valve can prevent water from escaping through the typically required vents during charging of the drive battery. In particular, the valve can be controlled so that the vents in the cooling circuit are coupled to the water outlet of the vent. In this case, the cooling circuit only needs to have a single outlet that can perform both functions.

[0021] In the method according to the present invention, it is also possible to arrange a fan upstream of the cold side in the cooling circuit and to convey the heating fluid through the cooling circuit using the fan. The fan allows the air used to heat the heat exchanger and, therefore, dry the cold side of the heat exchanger, to be efficiently directed through the cold side of the heat exchanger. A fan provided as part of an external charging unit or charging column can be used as the fan. By relocating functional components to the charging unit, weight and costs can be reduced in the electric vehicle. Furthermore, the fan in the external charging unit can be larger and correspondingly more powerful than in conventional electric vehicles. Nevertheless, the fan can still be used as part of the ventilation and / or air conditioning system of the electric vehicle. This provides greater flexibility in implementing the method according to the present invention. This can be achieved, for example, by providing a circuit with a hose that directs a portion of the mass flow of the ventilation and / or air conditioning system's air volume flow through the cold side of the heat exchanger. The intake area upstream of the fan is preferably equipped with a filter to protect the heat exchanger from dust and dirt, and the resulting damage and / or performance degradation.

[0022] A heating fluid heating device for heating a heating fluid can be arranged upstream of the cold side of the cooling circuit. In the method according to the present invention, the heating fluid can be heated by the heating fluid heating device to increase the temperature of the heat exchanger. Thus, the heating fluid, in the form of ambient air, can be heated to a desired temperature before being directed through the cold side of the heat exchanger. The heating fluid heating device can be arranged upstream and / or downstream of the fan. The heated air not only allows for better removal of residual moisture on the cold side of the heat exchanger, but also reduces the relative humidity of the ambient air used, thereby achieving an improved drying effect.

[0023] In the method according to the invention, the heat exchanger or at least a portion of the heat exchanger is preferably heated to a temperature exceeding 60°C, in particular exceeding 80°C, preferably exceeding 100°C. At temperatures above 60°C, the cold side of the heat exchanger can already be effectively disinfected. At temperatures above 80°C, a large portion of water residues in the heat exchanger can be evaporated. At temperatures exceeding 100°C, residual water in and / or on the heat exchanger can be completely evaporated. Temperatures exceeding 100°C are achieved, in particular, by appropriately high temperature control of the temperature control fluid in the battery circuit via a temperature control fluid heater, wherein the high temperature on the hot side of the heat exchanger is then reflected accordingly on the cold side of the heat exchanger.

[0024] According to another aspect of the invention, a temperature control device for cooling a drive battery of an electric vehicle is provided. The temperature control device comprises a heat exchanger with a hot side and a cold side, wherein the hot side is designed as part of a battery circuit of the temperature control device for conveying a temperature-control fluid to the drive battery, and the cold side is designed as part of a cooling circuit of the temperature control device for conducting a cooling fluid through the cold side. The temperature control device is configured and designed for carrying out the method described above. The temperature control device according to the invention therefore has the same advantages as those described in detail with reference to the method according to the invention. The temperature control device can be provided as a component of the electric vehicle and can be considered as part of the present invention.

[0025] Another aspect of the present invention relates to a computer program product comprising instructions that, when executed by a computer, cause the computer to perform the aforementioned method. Furthermore, a storage device is provided on which the computer program product is stored. The computer program product can be implemented as computer-readable instruction code in any suitable programming language, such as Java, C++, C#, and / or Python. The computer program product can be stored on a computer-readable storage medium such as a data disk, a removable drive, volatile and particularly non-volatile memory, or a built-in memory / processor. The instruction code can program a computer or other programmable device (e.g., a control device, particularly a control device of an electric vehicle) to perform the desired functions. Furthermore, the computer program product can be provided and / or located on a network such as the Internet, from which a user can download the computer program product when needed. The computer program product can be implemented not only with software but also with one or more specialized electronic circuits, i.e., in hardware, or in any hybrid form, i.e., with software and hardware components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further measures for improving the invention are apparent from the following description of various exemplary embodiments of the invention, which are schematically illustrated in the drawings. All features and / or advantages arising from the claims, the description, or the drawings, including structural details and spatial arrangements, may be essential to the invention individually and in various combinations.

[0027] Schematically in the accompanying drawings:

[0028] Figure 1 A driving battery having a temperature control device according to a first embodiment of the present invention is shown;

[0029] Figure 2 A driving battery having a temperature control device according to a second embodiment of the present invention is shown;

[0030] Figure 3 A driving battery having a temperature control device according to a third embodiment of the present invention is shown;

[0031] Figure 4 An electric vehicle having a temperature control device according to the invention is shown;

[0032] Figure 5 A storage device and a computer program product stored thereon according to the present invention are shown; and

[0033] Figure 6 A flow chart is shown for explaining the method according to a preferred embodiment of the present invention.

[0034] Elements having the same function and mode of operation are provided with the same reference symbols in all figures. DETAILED DESCRIPTION

[0035] Figure 1The illustration shows a drive battery 10 having a temperature control device 12 for cooling the drive battery 10 of an electric vehicle 11 during a fast charging process for charging the drive battery 10. The temperature control device 12 includes a heat exchanger 13 with a hot side 14 and a cold side 15. The hot side 14 is designed as part of a battery circuit 16 of the temperature control device 12 for conveying a temperature control fluid to the drive battery 10, and the cold side 15 is designed as part of a cooling circuit 17 of the temperature control device 12 for routing a cooling fluid through the cold side 15. The temperature control device 12 shown also includes a pump 26 for recirculating the temperature control medium in the battery circuit 16. A temperature control fluid heater 19 in the form of an electric heater is arranged upstream of the hot side 14 in the battery circuit 16. The battery circuit 16 also includes a bypass line 20 for routing the temperature control fluid past the drive battery 10. To this end, in the battery circuit 16, an output-side two-way valve 28 is arranged on the bypass line 20, and an output-side two-way valve 29 is arranged on the bypass line 20. In the cooling line 17, a further valve 21 in the form of a two-way valve is provided downstream of the cold side 15. In the cooling line 17, a fan 22 is arranged upstream of the cold side 15. An air filter 27 is arranged upstream of the fan 22. Furthermore, in the cooling line 17, a heating fluid heater 31 is arranged upstream of the cold side 15 and downstream of the fan 22 for heating a heating fluid or ambient air to generate hot air. An additional two-way valve 30 is arranged upstream of the cold side 15. During the charging process of the drive battery 10, the cooling fluid can be guided through the cold side 15 via the additional two-way valve 30 and a cooling medium line 32.

[0036] Figure 2 A temperature control device 12 according to a second embodiment is shown. According to this embodiment, a heat exchanger heater 18 in the form of an electric heater is arranged on the heat exchanger 13, more precisely on the hot side 14 of the heat exchanger. The bypass line 20 can thus be omitted.

[0037] Figure 3 A temperature control device 10 according to a third embodiment is shown. In this embodiment, not only the bypass line 20 but also the heat exchanger heater 18 is omitted. The heat exchanger 13 is heated or brought to the desired temperature by heating the temperature control fluid in the battery circuit 16 via a temperature control fluid heater 19. To prevent hot temperature control fluid from reaching the drive battery 10 and thereby damaging it, the temperature control fluid is conveyed only very slowly through the heat exchanger 13 or the hot side 14 by the pump 26.

[0038] Figure 4An electric vehicle 11 is shown, which has an electric motor 33 and a drive battery 10 for supplying electric motor 33 with current and voltage. Electric vehicle 11 also has a temperature control device 12, as described above, for controlling the temperature of drive battery 10. Electric vehicle 11 also has a control device 25, which is signal-connected to temperature control device 12 for controlling and / or regulating temperature control device 12.

[0039] Figure 5 A non-volatile memory device 24 is shown on which a computer program product 23 is stored, which comprises instructions which, when executed by a computer, for example in the form of a control device 25, cause the computer or the computer program product to execute a subsequent reference to the computer program product 23. Figure 6 Described method.

[0040] Now refer to Figure 6 A method for controlling or regulating a temperature control device 12 during the charging process of a drive battery 10 of an electric vehicle 11 is described. In a first step S1, the drive battery 10 is initially charged. More precisely, a rapid charging process is carried out. The drive battery 10 is cooled by means of the temperature control device 12. Once the charging of the drive battery 10 and thus also the additional cooling of the drive battery 10 are completed, the temperature of the heat exchanger 13 is increased in a second step S2 to remove or at least reduce residual water on and / or in the heat exchanger 13. More precisely, the heat exchanger 13 or at least a portion of the heat exchanger 13 is heated to a temperature exceeding 60°C.

[0041] The present invention also allows for further design principles in addition to the embodiments shown. That is, the present invention should not be considered to be limited to the exemplary embodiments described with reference to the drawings.

[0042] The temperature control device 12 can, for example, be provided and / or arranged only in the electric vehicle 11 and / or at least partially provided and / or arranged in an external charging unit, for example in the form of a charging column, for charging the drive battery 10 of the electric vehicle 11. In order to actively increase the temperature of the heat exchanger 13, a heating fluid can be guided through the cold side 15. The temperature control fluid can be heated by the temperature control fluid heating device 19 to increase the temperature of the heat exchanger 13. Figure 1 As shown, when the heat exchanger 13 is heated by the heated temperature control fluid, the temperature control fluid can also be guided past the drive battery 10 via the bypass line 20. It is also possible that the temperature of the heat exchanger 13 in the electric vehicle 11 is increased only when the electric vehicle 11 is stationary or not driving. The heating fluid can be discharged to the surroundings of the cooling circuit 17 via a valve 21. In addition, the heating fluid can be conveyed through the cooling circuit 17 by means of a fan 22 and / or heated by a heating fluid heater 31 in order to increase the temperature of the heat exchanger 13. Figure 2 In the system, after the driving battery 10 is charged, the heat exchanger 13 can be heated by the heat exchanger heating device 18. Figure 3 In an embodiment, it is possible that the temperature control fluid heated by the temperature control fluid heater 19 is conveyed through the hot side 14 at a flow rate for heating the heat exchanger 13 which is lower than the flow rate of the temperature control fluid through the battery circuit 16 during charging of the drive battery 10 .

[0043] Reference Signs List

[0044] 10 driving batteries

[0045] 11 Electric vehicles

[0046] 12 Temperature control equipment

[0047] 13Heat exchanger

[0048] 14 hot side

[0049] 15 cold side

[0050] 16 battery circuits

[0051] 17 cooling circuit

[0052] 18Heat exchanger heating device

[0053] 19 Temperature control fluid heating device

[0054] 20 bypass line

[0055] 21 valves

[0056] 22 fans

[0057] 23 Computer program products

[0058] 24 storage devices

[0059] 25 control devices

[0060] 26 pumps

[0061] 27 air filter

[0062] 28 two-way valve

[0063] 29 two-way valve

[0064] 30 two-way valve

[0065] 31 Heating fluid heating device

[0066] 32 cooling device circuit

[0067] 33 electric motors

[0068] S1 Step 1 (Charging the drive battery)

[0069] S2 step 2 (increasing the temperature of the heat exchanger)

Claims

1. A method for controlling a temperature control device (12) during the charging process of a drive battery (10) of an electric vehicle (11), the method comprising the following steps: - charging the driving battery (10), and - cooling the drive battery (10) by means of the temperature control device (12) during charging, wherein: The temperature control device (12) has a heat exchanger (13) with a hot side (14) and a cold side (15), the hot side (14) being designed as part of a battery circuit (16) for conveying a temperature control fluid to the drive battery (10), and the cold side (15) being designed as part of a cooling circuit (17) for conducting a cooling fluid through the cold side (15), wherein: - actively raising the temperature of the heat exchanger (13) after charging the driving battery (10), A heat exchanger heating device (18) is arranged on the heat exchanger (13), and the heat exchanger (13) is heated by the heat exchanger heating device (18) after the driving battery (10) is charged, or a temperature control fluid heating device (19) is arranged upstream of the hot side in the battery circuit (16), and the temperature control fluid is heated by the temperature control fluid heating device (19) to increase the temperature of the heat exchanger (13).

2. The method according to claim 1, characterized in that In order to increase the temperature of the heat exchanger (13), a heating fluid is directed through the cold side (15).

3. The method according to claim 1, characterized in that The temperature control fluid heated by the temperature control fluid heating device (19) is conveyed through the hot side (14) at a flow rate for heating the heat exchanger (13), the flow rate being lower than the flow rate of the temperature control fluid when the drive battery (10) is subjected to a predefined temperature control by the temperature control fluid.

4. The method according to claim 1, wherein The battery circuit (16) has a bypass line (20) for guiding a temperature control fluid past the drive battery (10), wherein the temperature control fluid is guided past the drive battery (10) via the bypass line (20) while the heat exchanger (13) is heated by the heated temperature control fluid.

5. The method according to claim 1, wherein When the electric vehicle (11) is stationary, the temperature of the heat exchanger (13) in the electric vehicle (11) is increased.

6. The method according to claim 2, characterized in that A valve (21) is arranged downstream of the cold side (15) in the cooling line (17), and the heating fluid is output to the surrounding environment of the cooling line (17) through the valve (21).

7. The method according to claim 2, characterized in that A fan (22) is arranged upstream of the cold side (15) in the cooling line (17), and the heating fluid is conveyed through the cooling line (17) by means of the fan (22).

8. The method according to claim 2, characterized in that A heating fluid heating device (31) for heating the heating fluid is arranged upstream of the cold side (15) in the cooling line (17), wherein the heating fluid is heated by the heating fluid heating device (31) to increase the temperature of the heat exchanger (13).

9. The method according to claim 1, characterized in that The heat exchanger (13) is heated to a temperature exceeding 60°C.

10. A temperature control device (12) for cooling a drive battery (10) of an electric vehicle (11), the temperature control device (12) comprising a heat exchanger (13) with a hot side (14) and a cold side (15), wherein: The hot side (14) is designed as part of a battery circuit (16) of the temperature control device (12) for conveying a temperature control fluid to the drive battery (10), and the cold side (15) is designed as part of a cooling circuit (17) of the temperature control device (12) for conducting a cooling fluid through the cold side (15), wherein the temperature control device (12) is configured and designed for carrying out the method according to any one of claims 1 to 9.

11. A computer program product (23) comprising instructions which, when the computer program product (23) is executed by a computer, cause the computer to carry out the method according to any one of claims 1 to 9.

12. A storage device (24) having a computer program product (23) according to claim 11 stored thereon.

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