Electric resistor unit for a vehicle, cooling circuit system, and vehicle having the electric resistor unit

Abstract

An electric resistor unit (50) for a vehicle has: at least one first electric resistor (51) having at least one electric resistor element (51A); at least one first fluid channel (51D) which is connected to the at least one electric resistor element (51A) of the first electrical resistor (51) so as to transfer heat; at least one second electric resistor (52) having at least one electric resistor element (52A); and at least one second fluid channel (52D) which is connected to the at least one electric resistor element (52A) of the second electric resistor (52) so as to transfer heat, the resistor unit (50) having a support plate (53) with two faces, the first electric resistor (51) being attached to the support plate (53) on a first face and the second electric resistor (52) being attached to the support plate (53) on a second face.

Description

[0001] 2024P00342 EN 11 . October 2024

[0002] 1

[0003] DESCRIPTION

[0004] Electrical resistance unit for a vehicle, cooling circuit system and vehicle with the electrical resistance unit

[0005] The present invention relates to an electrical resistance unit for a vehicle, a cooling circuit system for a vehicle with such an electrical resistance unit, and a vehicle with such an electrical resistance unit and / or a corresponding cooling circuit system.

[0006] Electrical resistors can be used in vehicles to convert electrical energy into heat, which can then be used to heat a fluid medium in a cooling circuit or at least dissipated by a fluid medium. For example, in electric or hybrid vehicles, an electrical resistor can be used as a so-called braking resistor. This resistor converts excess electrical energy during regenerative braking, at least partially, into heat that is then fed into a cooling circuit. However, the controllability of the heat introduced into the cooling circuit via the electrical resistor is limited. Furthermore, a vehicle typically has several cooling circuits, each designed for a specific temperature range.Adjusting the temperature caused by the electrical resistance in the respective cooling circuit is possible via appropriately powerful radiators, but this has a negative impact on the required installation space and costs.

[0007] To save space and costs, a compact resistor unit with multiple resistors can be used. However, such an arrangement presents the challenges of securely mounting these resistors in the smallest possible space and, furthermore, reducing or preventing heat transfer between the resistors. 2024P00342 DE

[0008] 2

[0009] The object of the present invention is to solve the above problems and to provide a means of enabling reliable and effective heat dissipation to cooling circuits.

[0010] The problem is solved by the subject matter of the independent claims. Advantageous further developments are contained in the dependent claims.

[0011] According to the invention, an electrical resistance unit for a vehicle comprises at least one first electrical resistor with at least one resistive element and at least one first fluid channel which is in heat-transferring communication with the at least one resistive element of the first electrical resistor. Furthermore, the electrical resistance unit comprises at least one second electrical resistor with at least one resistive element and at least one second fluid channel which is in heat-transferring communication with the at least one resistive element of the second electrical resistor. The resistance unit also comprises a carrier plate with two opposite sides; the first electrical resistor is mounted on the carrier plate on one side, and the second electrical resistor is mounted on the carrier plate on the other side.

[0012] Accordingly, the electrical resistance unit comprises at least two electrical resistors, each of which is in heat-transferring contact with a separate fluid channel. The heat-transferring connection can be configured such that the respective fluid channel flows through the respective electrical resistor at least partially and / or flows along the respective electrical resistor at least partially.

[0013] The first fluid channel can then be connected to a first cooling circuit, which will be described later, or form part of the first cooling circuit, and the second fluid channel can be connected to a second cooling circuit, which will be described later, or form part of the second cooling circuit, in a similar way. 2024P00342 DE

[0014] 3

[0015] By attaching the two electrical resistors to the two opposite sides of the carrier plate, it is possible to easily and stably attach the individual electrical resistors and at least reduce heat transfer between the electrical resistors through the carrier plate, while keeping the thermal mass low.

[0016] In an advantageous embodiment, the carrier plate has a third fluid channel connected to the first fluid channel, and / or has a fourth fluid channel connected to the second fluid channel to convey a fluid from the first or second fluid channel.

[0017] It is possible to simply drain the fluid out of the resistance unit.

[0018] In a further advantageous embodiment, the electrical resistance unit has an insulating material on the first side of the carrier plate and / or on the second side of the carrier plate, which is designed to at least reduce heat transfer from the at least one first electrical resistance or from the at least one second electrical resistance to the carrier plate.

[0019] This reduces or prevents heat transfer between the electrical resistors compared to the situation where no insulating material is used, in order to better control the temperatures of the fluid flowing into the cooling circuits.

[0020] Preferably, the electrical resistance unit has a housing made of a thermally insulating material, in particular plastic.

[0021] The thermal mass is reduced by using a housing made of thermally insulating material instead of a metal housing, which can be made of plastic in particular.

[0022] In an advantageous embodiment, a larger quantity of heat is transferred to the fluid flowing in the first fluid channel by means of at least one first electrical resistance. 2024P00342 DE

[0023] 4

[0024] Fluid interchangeable as through at least one second electrical resistance with a fluid flowing in the second fluid channel.

[0025] For example, the first electrical resistor is configured such that, for the same amount of electrical energy flow, it generates more heat than the second resistor. Accordingly, the material and / or geometry of the first resistor, or a corresponding resistive element within it, may differ from that of the second resistor. Furthermore, the number of resistive elements in the first resistor may be greater than the number in the second resistor. In summary, the first resistor may exhibit a higher heat dissipation capacity than the second resistor.

[0026] In terms of the different heat exchange performance between the first electrical resistance and the first fluid channel, as well as between the second electrical resistance and the second fluid channel, the electrical resistance unit can also be referred to as an asymmetric electrical resistance unit or as an electrical resistance unit with asymmetric electrical resistances.

[0027] In an advantageous embodiment, the first electrical resistance has a higher area fraction than the second electrical resistance and / or the flow path of the fluid through the first fluid channel in heat-transferring connection with the at least one electrical resistance element of the first electrical resistance is longer than the flow path of the fluid through the second fluid channel in heat-transferring connection with the at least one electrical resistance element of the second electrical resistance.

[0028] Thus, as an alternative or supplement to a material and / or geometry selection, a higher heat dissipation rate from the first electrical resistance to the first fluid channel can also be achieved by directly 2024P00342 DE

[0029] 5

[0030] The heat transfer area between the first electrical resistance and the first fluid channel is increased.

[0031] In an advantageous embodiment, the electrical resistance unit has a switching unit with at least one switching element, via which the first electrical resistance and / or the second electrical resistance can be connected to an electrical energy source, or a connection for a switching unit.

[0032] The first and / or the second electrical resistor can thus be selectively connected via the switching unit to the electrical energy source, which can generate heat through the electrical resistor connected to it. Accordingly, for example, in cases where only the first fluid channel is intended for heat absorption, only the first electrical resistor can be connected to the electrical energy source, while the connection between the electrical energy source and the second electrical resistor is disconnected. Similarly, in cases where only the second fluid channel is intended for heat absorption, only the second electrical resistor can be connected to the electrical energy source, while the connection between the electrical energy source and the first electrical resistor is disconnected.In cases where both the first and second fluid channels are intended for heat absorption, both the first and second electrical resistors are connected to the electrical power source. If either the first or the second fluid channel is always intended for heat absorption, and the other fluid channel is only intended for optional heat absorption, then only the electrical resistor assigned to the fluid channel for optional heat absorption can be switchable. For example, if the optional heat absorption applies to the second fluid channel, the second electrical resistor is switchable, and the first electrical resistor is permanently connected to the electrical power source.

[0033] An electrical energy source can be, for example, an electric motor of an electric vehicle or hybrid vehicle that generates electrical energy in recuperation mode, which is optionally transferred via the first and / or second electrical resistor 2024P00342 DE as an electrical braking resistor.

[0034] 6 is at least partially converted into heat and accordingly transferred to a fluid in the first and / or second fluid channel.

[0035] In an advantageous embodiment, the electrical resistance unit has a control device for controlling the switching unit or a connection for a control device for controlling the switching unit.

[0036] In particular, the control device can also be part of the switching unit in order to control individual switching elements of the switching unit. Alternatively or additionally, the electrical resistance unit can also have a signal interface for receiving corresponding control signals from a higher-level control device. The control device of the electrical resistance unit and / or the higher-level control device can derive corresponding control signals for the switching unit, for example, from an input command, an operating state, and / or sensor signals.

[0037] According to a further aspect, the present invention relates to a cooling circuit system for a vehicle. The cooling circuit system comprises at least a first cooling circuit, at least a second cooling circuit, and at least one previously described electrical resistance unit. The first fluid channel forms part of the first cooling circuit, and the second fluid channel forms part of the second cooling circuit.

[0038] The electrical resistance unit can thus transfer heat from the first electrical resistance to a fluid in the first cooling circuit that flows through the first fluid channel. Similarly, the electrical resistance unit can transfer heat from the second electrical resistance to a fluid in the second cooling circuit that flows through the second fluid channel.

[0039] According to the above description, the electrical resistance unit can be configured such that the amount of heat transferable from the first electrical resistance to the first fluid channel differs from the amount of heat transferable from the second electrical resistance to the second fluid channel, 2024P00342 DE

[0040] 7 is particularly higher. In addition, the first and / or second electrical resistance for heat generation and corresponding heat transfer can be switched in order to selectively influence the first and / or second cooling circuit.

[0041] In principle, a cooling circuit can include a radiator, a fluid pump, a heat exchanger and / or an object to be cooled, in addition to the respective fluid channel.

[0042] In an advantageous embodiment, the first cooling circuit forms a cooling circuit for medium temperatures, preferably in a temperature range of 60 °C to 80 °C, in particular a drive cooling circuit and / or a fuel cell cooling circuit.

[0043] For example, if an electrical resistance unit exists in which the first electrical resistor, when connected to an electrical energy source, can transfer more heat to the first fluid channel than the second electrical resistor to the second fluid channel, then the first fluid channel is preferably part of a first cooling circuit designed for medium temperatures and thus capable of tolerating a higher heat absorption. For instance, an increased fluid temperature due to heat input via the first electrical resistor can still remain within the intended temperature range of the first cooling circuit or be reduced again by a radiator located within the first cooling circuit.

[0044] A mean temperature for cooling circuits in vehicle applications is preferably between 60 °C and 80 °C, particularly preferably between about 65 °C and 75 °C. This applies in particular to a drive cooling circuit, which can be used to cool, for example, a power steering pump, an inverter and / or an electric axle drive, and / or also a fuel cell cooling circuit.

[0045] In an advantageous embodiment, the second cooling circuit forms a cooling circuit for low temperatures, preferably in a temperature range of 15 °C to 45 °C, in particular a battery cooling circuit. 2024P00342 DE

[0046] 8

[0047] For example, if an electrical resistance unit is present in which the second electrical resistance, when connected to an electrical energy source, can transfer less heat to the second fluid channel than the first electrical resistance to the first fluid channel, then the second fluid channel is preferably part of a second cooling circuit designed for lower temperatures and therefore, in principle, able to tolerate only a lower heat absorption. For example, an increased temperature of the fluid due to heat input via the second electrical resistance can still remain within the intended temperature range of the second cooling circuit or be reduced again by a radiator arranged in the second cooling circuit.

[0048] A lower temperature for cooling circuits in vehicle applications is preferably between 15 °C and 45 °C, particularly preferably between about 20 °C and 40 °C. This applies in particular to a battery cooling circuit, for example, to cool a battery.

[0049] In an advantageous embodiment, the cooling circuit system has at least a third cooling circuit, in particular an HVAC cooling circuit, which is in thermal contact with the second cooling circuit via a cooling circuit heat exchanger.

[0050] The cooling circuit system can therefore be expanded by at least one third cooling circuit, which is thermally connected to the second cooling circuit via at least one heat exchanger. Alternatively or additionally, the third or a fourth cooling circuit can be thermally connected to the first cooling circuit via the heat exchanger or another heat exchanger.

[0051] In an advantageous embodiment, the electrical resistance unit forms an electrical braking resistor.

[0052] The electrical energy generated during recuperation can thus be converted into heat via the electrical resistance unit as an electrical braking resistor 2024P00342 DE

[0053] 9 is converted and distributed to the first and second cooling circuits. Preferably, the heat input via the previously described switching unit can selectively occur only through the first electrical resistor into the first cooling circuit, through the second resistor into the second cooling circuit, and through the first electrical resistor into the first cooling circuit as well as through only the second resistor into the second cooling circuit.

[0054] The features described above for the cooling circuit system of the electrical resistance unit are equally applicable to the claimed cooling circuit system. Likewise, the features described for the electrical resistance unit in relation to the cooling circuit system are transferable to the claimed electrical resistance unit, unless they have already been described therein.

[0055] According to another aspect, the present invention relates to a vehicle with at least one previously described electrical resistance unit and / or a previously described cooling circuit system.

[0056] The vehicle is particularly suitable for electric vehicles or hybrid vehicles, where the electrical resistance unit preferably forms an electrical braking resistance.

[0057] The features described above for the electrical resistance unit and / or the cooling system are equally applicable to the vehicle. Likewise, features described for the electrical resistance unit and / or the cooling system relating to the vehicle are transferable to the electrical resistance unit and / or the cooling system, provided they have not already been described therein.

[0058] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. 2024P00342 DE

[0059] 10

[0060] In detail, it shows

[0061] Fig. 1 shows a schematic representation of a cooling circuit system according to a first exemplary embodiment; and

[0062] Fig. 2 shows a schematic representation of an electrical resistance unit according to an exemplary embodiment.

[0063] Fig. 1 shows a schematic representation of a cooling circuit system 100 according to a first exemplary embodiment. The cooling circuit system 100 consists of a first cooling circuit 10, a second cooling circuit 20, and a third cooling circuit 30, as well as an electrical resistance unit 50.

[0064] The first cooling circuit 10 comprises a radiator 11 and a fluid pump 12 located downstream of the radiator 11 in the direction of flow of the fluid flowing in the first cooling circuit 10. The fluid pump 12 supplies the fluid to, for example, a steering pump 13A, an inverter 13B, and an electric axle drive 13C, as examples of vehicle components to be cooled. The fluid then rejoins the radiators and passes through a valve unit and the electrical resistance unit 50, as will be described below, before flowing back through the radiator 11. The first cooling circuit 10 thus forms a drive cooling circuit with average temperatures of 65 °C to 75 °C.

[0065] The second cooling circuit 20 is a battery cooling circuit with lower temperatures of 20 °C to 40 °C. The fluid circulating in the second cooling circuit 20 is supplied by a fluid pump 22 in the flow direction to a downstream battery 23, the vehicle component to be cooled, and to a radiator 21 connected in parallel to the battery 23. The fluid components flowing through the battery 23 and the radiator 21 are recombined via a valve unit 24 and pass through the electrical resistance unit 50 before the fluid is again pumped through the fluid pump 22. Furthermore, a heat exchanger 25 is arranged in the second cooling circuit 20 between the battery 23 and the valve unit 24, through which the 2024P00342 DE

[0066] 11. The second cooling circuit 20 is in thermal connection with a third cooling circuit 30.

[0067] The third cooling circuit 30 is an HVAC cooling circuit with a suitable refrigerant as the fluid, which is supplied to an HVAC device 33 via a fluid pump 32. The fluid flowing out of the HVAC device 33 passes through the heat exchanger 25 before passing through the fluid pump 32 again.

[0068] In the exemplary embodiment, the electrical resistance unit 50 is an electrical braking resistor. Accordingly, the electrical resistance unit 50 can convert electrical energy generated by an electric motor as an electrical energy source during recuperation operation into thermal energy when connected to the electric motor. In alternative embodiments, a vehicle has a battery as the electrical energy source.

[0069] To convert electrical energy into thermal energy, the electrical resistance unit 50 comprises a first electrical resistance 51 and a second electrical resistance 52. As will be explained in more detail later with reference to Fig. 2, the first electrical resistance 51 has a higher heat dissipation capacity than the second electrical resistance 52. The first electrical resistance 51 is traversed by a first fluid channel 51D (Fig. 2), which forms part of the first cooling circuit 10. The second electrical resistance 52 is traversed by a second fluid channel 52D (Fig. 2), which forms part of the second cooling circuit 20.If the first electrical resistor 51 and the second electrical resistor 52 are connected to the electric motor as the electrical energy source, the heat generated by the first electrical resistor 51 is absorbed by the first cooling circuit 10, and the heat generated by the second electrical resistor 52 is absorbed by the second cooling circuit 20. However, since heat absorption by both cooling circuits is not always desirable, the electrical resistor unit 50 has a switching unit 40 to selectively switch the connection of the first electrical resistor 51 and / or the second electrical resistor 52 to the electric motor. 2024P00342 DE.

[0070] 12

[0071] The switching unit 40 can be controlled by a control device 60 and in the exemplary embodiment comprises six switching elements 41, 42, 43, 44, 45, 46, via which the switching unit 40 forms a so-called brake chopper with three phases.

[0072] In the exemplary embodiment, the first electrical resistor 51 is switched on when the switching elements 43 and 45 are closed, i.e., in a conducting state. The second electrical resistor 52 is switched on when the switching elements 43 and 44 are closed, i.e., in a conducting state. Both the first electrical resistor 51 and the second electrical resistor 52 are switched on when the switching elements 43, 44, and 45 are closed, i.e., in a conducting state.

[0073] If the control device now initiates continuous braking in accordance with a sustained braking command, resulting in a correspondingly high generation of electrical energy that can no longer be used to charge one of the batteries 23, the control device 60 activates the switching unit 40 such that both the first electrical resistor 51 and the second electrical resistor 52 are connected to the electric motor. Accordingly, the heat generated by the first electrical resistor 51 is absorbed by the first cooling circuit 10, and the heat generated by the second electrical resistor 52 is absorbed by the second cooling circuit 20. The first electrical resistor 51 has a heat dissipation capacity of up to approximately 100 kW, and the second electrical resistor 51 has a heat dissipation capacity of up to approximately 30 to 50 kW.

[0074] If the control device determines that only the second cooling circuit 20 can absorb heat, only the second electrical resistor 52 is connected to the electric motor. Similarly, only the first electrical resistor 51 is connected to the electric motor if the control device 60 determines that only the first cooling circuit 10 can absorb heat. 2024P00342 DE

[0075] 13

[0076] Fig. 2 shows a schematic representation of the electrical resistance unit 50 according to an exemplary embodiment. As described above with reference to Fig. 1, the first electrical resistance 51 has a higher heat dissipation capacity than the second electrical resistance 52. In the embodiment shown, this is achieved by the first resistance 51 forming a first fluid channel 51D from a fluid inlet 51B to a fluid outlet 51C, in which the fluid is guided past eighteen resistance elements 51A of the first electrical resistance 51 according to the arrows shown, with three configurations of six parallel resistance elements 51A being arranged one after the other or in series in meandering sections.The fluid in the second fluid channel 52D flows through only six resistance elements 52A of the second electrical resistance 52 from a fluid inlet 52B to a fluid outlet 52C of the second fluid channel 52D.

[0077] The electrical resistance unit 50 has a mounting plate 53. The mounting plate 53 has two opposite sides, with the first electrical resistor 51 attached to the mounting plate 53 on one side and the second electrical resistor 52 attached to the mounting plate 53 on the other side. The electrical resistors 51 and 52 are fastened to the mounting plate 53 by means of clamping devices 54. In alternative embodiments, the electrical resistors are, for example, screwed or bolted in place.

[0078] The carrier plate 53 further comprises a third fluid channel 55. The third fluid channel 55 extends along the sides of the carrier plate 53 and has a connection to which the fluid outlet 51C of the first fluid channel 51D is connected, thereby connecting the first fluid channel 51D to the third fluid channel 55. This allows the fluid from the first fluid channel 51D to be routed through the third fluid channel 55 and flow into the first cooling circuit 10. In alternative embodiments, the carrier plate 53 additionally or alternatively comprises a fourth fluid channel (not shown) which is connected to the second fluid channel 52D to route the fluid in the second fluid channel 52D through the fourth fluid channel. 2024P00342 DE

[0079] 14

[0080] The carrier plate 53 has an insulating material 56 on one side, namely the second side, to which the second electrical resistor 52 is attached. This insulating material reduces, or at least nearly prevents, heat transfer from the second electrical resistor 52 to the carrier plate 53 compared to the situation where the insulating material 56 is not present. The insulating material 56 is formed from a thermally insulating layer, in particular from plastic, which is bonded to the carrier plate 53. In alternative embodiments, the insulating material 56 consists of a separate plate arranged between the second electrical resistor 52 and the carrier plate 53. In further alternative embodiments, the insulating material is additionally or alternatively arranged on the first side between the first electrical resistor 51 and the carrier plate 53.

[0081] The electrical resistance unit 50 further comprises a housing 57. The housing 57 surrounds the electrical resistance unit 50 and shields the electrical resistors from the environment. Instead of a metal housing, the housing 57 is made of a thermally insulating material, in particular a plastic with a correspondingly low thermal conductivity.

[0082] The invention defined in the claims is not limited to the described embodiments. In particular, features described in relation to the embodiments, other described configurations and further developments of the invention can be combined with one another, provided they are not mutually exclusive.

[0083] 2024P00342 DE

[0084] REFERENCE MARK LIST

[0085] 10 first cooling circuit

[0086] 11 Radiator

[0087] 12 Fluid pump

[0088] 13A Power steering pump

[0089] 13B Inverter

[0090] 13C electric axle drive

[0091] 14 Valve unit

[0092] 20 second cooling circuit

[0093] 21 Radiator

[0094] 22 Fluid pump

[0095] 23 Battery

[0096] 24 valve unit

[0097] 25 Cooling circuit heat exchangers

[0098] 30 third cooling circuit

[0099] 32 Fluid pump

[0100] 33 HVAC equipment

[0101] 40 switching unit

[0102] 41 Switching element

[0103] 42 Switching element

[0104] 43 Switching element

[0105] 44 Switching element

[0106] 45 Switching element

[0107] 46 Switching element

[0108] 50 electrical resistance units

[0109] 51 first electrical resistance

[0110] 51 A electrical resistance element

[0111] 51 B Fluid inlet

[0112] 51°C Fluid outlet

[0113] 51 D first fluid channel

[0114] 52 second electrical resistance

[0115] 52A electrical resistance element 2024P00342 DE

[0116] 52B Fluid inlet

[0117] 52C Fluid outlet

[0118] 52D second fluid channel

[0119] 53 Carrier plate 54 Clamping device

[0120] 55 third fluid channel

[0121] 56 Insulation material

[0122] 57 cases

[0123] 60 Control device 100 Cooling circuit system

Claims

2024P00342 DE 17 PATENT CLAIMS 1. Electrical resistance unit (50) for a vehicle, comprising: at least one first electrical resistor (51) with at least one electrical resistance element (51A), at least one first fluid channel (51D) which is in heat-transferring communication with the at least one electrical resistance element (51A) of the first electrical resistor (51), at least one second electrical resistor (52) with at least one electrical resistance element (52A) and at least one second fluid channel (52D) which is in heat-transferring communication with the at least one electrical resistance element (52A) of the second electrical resistor (52), wherein the resistance unit (50) has a carrier plate (53) with two opposite sides, and the first electrical resistor (51) is attached to the carrier plate (53) on a first side and the second electrical resistor (52) is attached to the carrier plate (53) on a second side.

2. Electrical resistance unit (50) according to claim 1, wherein the carrier plate (53) has a third fluid channel (55) connected to the first fluid channel (51D), and / or a fourth fluid channel connected to the second fluid channel (52D) to convey a fluid flowing in the first fluid channel (51D) or the second fluid channel (52D).

3. Electrical resistance unit (50) according to claim 1 or 2, wherein the electrical resistance unit (50) has an insulating material (56) on the first side of the carrier plate (53) and / or on the second side of the carrier plate (53) which is configured to at least reduce heat transfer from the at least one first electrical resistance (51) or from the at least one second electrical resistance (52) to the carrier plate (53).

4. Electrical resistance unit (50) according to one of the preceding claims, wherein 2024P00342 DE 18 the electrical resistance unit (50) has a housing (57) made of a thermally insulating material, in particular plastic.

5. Electrical resistance unit (50) according to one of the preceding claims, wherein a larger quantity of heat can be exchanged with a fluid flowing in the first fluid channel (51D) through the at least one first electrical resistance (51) than through the at least one second electrical resistance (52) with a fluid flowing in the second fluid channel (52D).

6. Electrical resistance unit (50) according to claim 5, wherein the first electrical resistance (51) has a higher area fraction than the second electrical resistance (52) and / or the flow path of the fluid through the first fluid channel (51D) in heat-transferring connection with the at least one electrical resistance element (51A) of the first electrical resistance (51) is longer than the flow path of the fluid through the second fluid channel (51D) in heat-transferring connection with the at least one electrical resistance element (52A) of the second electrical resistance (52).

7. Electrical resistance unit (50) according to one of the preceding claims, wherein the electrical resistance unit (50, 50') has a switching unit (40) with at least one switching element (41, 42, 43, 44, 45, 46) via which the first electrical resistance (51) and / or the second electrical resistance (52) can be connected to an electrical energy source, or has a connection for a switching unit (40).

8. Electrical resistance unit (50) according to claim 7, wherein the electrical resistance unit (50) has a control device (60) for controlling the switching unit (40) or a connection for a control device (60) for controlling the switching unit (40).

9. Cooling circuit system (100) for a vehicle, comprising: at least one first cooling circuit (10), at least one second cooling circuit (20) and 2024P00342 DE 19 at least one electrical resistance unit (50) according to one of the preceding claims, wherein the first fluid channel (51D) forms part of the first cooling circuit (10) and the second fluid channel (52D) forms part of the second cooling circuit (20).

10. Cooling circuit system (100) according to claim 9, wherein the first cooling circuit (10) forms a cooling circuit for medium temperatures, preferably in a temperature range of 60 °C to 80 °C, in particular a drive cooling circuit.

11. Cooling circuit system (100) according to claim 9 or 10, wherein the second cooling circuit (20) forms a cooling circuit for low temperatures, preferably in a temperature range of 15 °C to 45 °C, in particular a battery cooling circuit.

12. Cooling circuit system (100) according to one of claims 9 to 11, wherein the cooling circuit system (100) has at least a third cooling circuit (30), in particular an HVAC cooling circuit, which is in thermal contact with the second cooling circuit (25) via a cooling circuit heat exchanger (25).

13. Cooling circuit system (100) according to one of claims 9 to 12, wherein the electrical resistance unit (50) forms an electrical braking resistor.

14. Vehicle with at least one electrical resistance unit (50) according to one of claims 1 to 8 and / or a cooling circuit system (100) according to one of claims 9 to 13.

Images