Carbon dioxide thermal management device for vehicles, particularly electric-powered ones.

Abstract

The invention relates to a thermal management device for a vehicle, according to which the thermal management device comprises a phase-change fluid circuit (1), of the carbon dioxide type, the circuit (1) being connected by a first heat exchanger (14) to a first heat exchange circuit (2), said first heat exchanger (14) being in particular an evaporator (14), the circuit (1) being connected by a second heat exchanger (11) to a second heat exchange circuit (3), said second exchanger (11) being in particular a gas cooler (11), each of the first and second heat exchange circuits (2, 3) comprising a means for controlling the flow of a heat transfer fluid, such that said first and second heat exchangers (11, 14) are respectively of the type of a carbon dioxide / water cooler and a liquid carbon dioxide evaporator.The invention also relates to a vehicle having such a device, as well as a cooling method. Figure for the abstract: 1.

Description

Title of the invention: Carbon dioxide thermal management device for vehicles, in particular electric-powered vehicles.

[0001] The invention relates to the field of vehicles, particularly automobiles, which include thermal management devices. The vehicle is preferably of the electric propulsion type.

[0002] Various types of refrigerants are known for regulating the temperature of the passenger compartment or battery of an electric vehicle. Each refrigerant is assigned a greenhouse effect coefficient, and it is well established that refrigerant 1234yf® has a significantly lower greenhouse effect coefficient than the previous refrigerant 134a®. However, this important improvement faces other obstacles to its continued commercialization, notably the fact that it contains a fluorinated substance considered hazardous to public health.

[0003] Other types of natural refrigerant exist, such as propane or carbon dioxide, so the replacement of the 1234yf® refrigerant in air conditioning circuits is to be considered in the near future. The use of carbon dioxide refrigerant requires resistance to high pressures, such as 125 bar, and also to operating temperatures of around 150°C. Due to these pressure and temperature parameters, the risk of leaks is a drawback to its widespread use, particularly in mass production within the automotive sector. However, it is necessary to respect the safety requirements relating to the very nature of the fluid, by creating a compact air conditioning loop, so that leak management can be simplified.

[0004] The replacement of the 1234yf® refrigerant with carbon dioxide sets the framework within which the present invention falls.

[0005] The invention relates to a thermal management device for a vehicle, in particular an electric vehicle comprising at least one element of the powertrain and a vehicle passenger compartment to be thermally regulated, characterized in that the thermal management device comprises a phase-change fluid circuit of the carbon dioxide type, in that the circuit is connected by a first heat exchanger to a first heat exchange circuit, said first heat exchanger being in particular a cooler, in that the circuit is connected by a second heat exchanger to a second heat exchange circuit, said second exchanger being in particular a carbon dioxide cooler, each of the first and second heat exchange circuits comprising a control means for the flow rate of a heat transfer fluid, in particular water, such that said first exchanger is of the type of a liquid / water carbon dioxide evaporator and second heat exchanger is of the carbon dioxide / water type.

[0006] The device that is the subject of the invention may further comprise the following characteristics, taken separately or in combination with each other: - the phase-change fluid is carbon dioxide; the device components include means for resisting pressure of approximately 125 bar and means for resisting temperature of 150°C. - The phase-change fluid circuit comprises a compressor, a cooler, an expansion valve, and an evaporator, in that order, within a main fluid loop circulating when the compressor is started; - The second heat exchange circuit comprises a thermal loop in which are included at least the gas cooler, a radiator, and a water pump, arranged respectively in that order when the water pump is started; the thermal loop of the second heat exchange circuit is, in particular, a third thermal loop of the device. - the second heat exchange circuit further includes at least one first component of an electric traction chain located at a branch connecting the gas cooler to the radiator, and / or a degassing tank located at a branch connecting the radiator to the water pump, - the first heat exchange circuit comprises a first thermal regulation loop and a second thermal regulation loop connected to each other via an interconnection means comprising branches such that one of the branches is a supply line to the second thermal regulation loop, and the other of the branches is an outlet line to the second thermal regulation loop, - it includes a means of controlling the flow rate from the first thermal regulation loop to the second thermal regulation loop, - the first thermal regulation loop includes an air exchanger designed to be cooled by a flow of air for the vehicle's passenger compartment, - the second thermal regulation loop includes a second component of an electric traction chain, in particular an electric battery, or a dielectric fluid cooler intended for cooling the second component of the electric traction chain, in particular the cells of an electric battery, - said flow control means is a regulating valve located at the connection branch or at a junction between the supply line of the second thermal regulation loop and the first regulation loop thermal, said junction being located at the outlet of the air exchanger of the first thermal regulation loop, - The first thermal regulation loop includes the phase-change fluid circuit cooler, a pump, and the air exchanger, in that order when the pump is started. - The first thermal regulation loop includes a degassing chamber, - The second thermal regulation loop includes a pump, the second component to be cooled in the electric traction chain, a radiator, a radiator bypass branch, and a bypass valve located at the junction between the branch containing the radiator and the bypass branch. - the bypass branch includes two junctions with said interconnection means, one with the supply line, the other for the discharge line, - it includes a control unit for the water pumps, compressor, expansion valve, as well as at least one temperature sensor connected to the control unit.

[0007] The invention also relates to a vehicle, in particular of the electric propulsion type, characterized in that it includes the thermal management device having at least one of the aforementioned characteristics.

[0008] The invention also relates to a method for cooling at least one element of the powertrain and / or a passenger compartment of a vehicle according to the preceding claim, characterized in that it comprises the steps of implementing the following thermal regulations: - of the phase-change fluid circuit, such that, when passenger compartment cooling is required, the coolant temperature at the cooler outlet is approximately zero degrees Celsius, by controlling the operation of the compressor and / or the expansion valve and / or the gas cooler, - of the second heat exchange circuit by controlling the operation of the water pump, - of the first loop of the first heat exchange circuit such that the temperature of the heat transfer fluid at the outlet of the air exchanger is between 0 and 5 degrees Celsius when cooling of the passenger compartment is requested, by a control of the operation of the water pump and / or the positioning of flaps regulating the airflow through the cooler and / or a cooler bypass valve, - of the second loop of the first heat exchange circuit such that the temperature of the coolant at the second component to be cooled is greater than or equal to the temperature of the heat transfer fluid at the outlet of the exchanger air, while being between 10 and 30 degrees Celsius, preferably 18 degrees Celsius, by a control of the operation of the water pump and / or a bypass valve.

[0009] The method of the invention may further comprise the following features: - when the temperature of the heat transfer fluid at the outlet of the exhaust pipe is higher than the ambient air temperature, the bypass valve is partially closed in order to cool the heat transfer fluid by heat exchange with the ambient air in the radiator, - the step of implementing the thermal regulation of the first heat exchange circuit, in particular of the first and / or second thermal regulation loop, is carried out by said flow control means, which may be a three-way valve or a two-way valve located in one of the branches of said interconnection means, - the step of implementing the thermal regulation of the first heat exchange circuit, in particular of the first and / or second thermal regulation loop, is carried out by at least one adjustment means located at the level of the first heat exchange circuit, in particular at the level of a branch connecting the coolers together, and / or of the second heat exchange circuit, in particular at the level of a bypass branch, which tends to control the flow of heat transfer fluid circulating respectively at the level of the first and second thermal regulation loops.

[0010] The attached drawings represent, by way of example, a thermal management device for a vehicle, according to the invention. Fig. 1 schematically represents a thermal management device comprising a phase change fluid circuit of the carbon dioxide type, intended in particular for automotive use, according to the invention; Figure 2 represents a variant of the thermal management device of Figure 1; Figure 3 schematically represents a means of regulating the heat exchange between a heat transfer fluid and the air destined for the passenger compartment, of the thermal management device of the invention. Figure 4 schematically represents a means of regulating the water temperature of the heat exchange between a heat transfer fluid and the air destined for the passenger compartment, of the thermal management device of the invention. Fig. 1 represents a thermal management device comprising 3 distinct parts. The first part concerns a phase change fluid circuit 1 whose particularity lies in the use of carbon dioxide as the phase change fluid. The circuit in which the carbon dioxide circulates is arranged inside a hermetically sealed enclosure, in the sense that it is airtight so that any leakage of carbon dioxide cannot be dispersed into the ambient air.

[0011] Inside the enclosure are arranged a compressor 10, a second heat exchanger 11 of the gas cooler type, a reservoir 12, an expansion valve 13, a first heat exchanger 14 of the evaporator type, and a tank 12, in that order according to the direction of fluid flow during compressor operation. A main loop of the thermal management system consists of the compressor 10, the first and second heat exchangers 14 and 11, and the expansion valve 13 connected in series, such that each includes fluid inlet and outlet pipes. The tank 12 is positioned between the heat exchanger 14 and the compressor. The fluid exiting the evaporator may contain liquid. In this tank, the liquid is retained, and the vapor is drawn in by the compressor.This reservoir is therefore designed to separate the liquid from the vapor of the refrigerant, creating a reserve volume of refrigerant to compensate for the volume variation of the fluid in the air conditioning circuit. The first and second heat exchangers 14, 11 allow energy transfer between carbon dioxide and a heat transfer fluid circulating respectively in the first and second heat exchange circuits 2, 3.

[0012] The fluidic connection between the phase change circuit 1 and the first and second heat exchange circuits 2, 3 is made through the enclosure in which the circuit 1 is located, via in particular connectors. The heat exchange between the carbon dioxide of circuit 1 and the heat transfer fluid of the first heat exchange circuit 2 takes place inside the enclosure. The heat exchange between the carbon dioxide of circuit 1 and the heat transfer fluid of the second heat exchange circuit 3 takes place inside the enclosure. The volume of the enclosure is approximately 15 liters, so that all the components of the main loop of the thermal management device are constrained in terms of arrangement, which makes the thermal management device compact.

[0013] The first heat exchange circuit 2 will now be detailed. It includes a pump 20 whose operation will generate the circulation of a heat transfer fluid, such as glycol water. The first heat exchange circuit 2 includes a first thermal regulation loop L2. The first thermal regulation loop includes in series the cooler 14, the pump 20, an air heater 21, taken in that order during the operation of the pump. A degassing device 22 is arranged between the air heater 21 and the cooler 14. The degassing device includes a non-through degassing jar, connected to the branch linking the air heater 21 to the cooler 14 by a junction branch.

[0014] The arrangement of the jar in the first heat exchange loop L2, near the second heat exchange loop L4 also allows degassing of the second loop, without adding another degassing jar. According to one embodiment, the degassing jar can be through-hole, which is more efficient in terms of degassing, but also generates more circulating water volume, thus increasing the thermal inertia of the loop.

[0015] Preferably, the air at the outlet of the air heater 21 is between 0°C and 10°C, preferably 4°C.

[0016] The first heat exchange circuit 2 includes a second thermal regulation loop L4, which according to an alternative embodiment could well include the degassing jar 22. Regardless of the location of the degassing jar 22 directly at the level of the first or second thermal regulation loop L2, L4, its presence is essential to ensure the proper functioning of the thermal management device, and also for any after-sales service, which required draining of the first heat exchange circuit 2. The second thermal regulation loop L4 includes a pump 40, a component to be cooled, a radiator 47, a bypass branch 46 of the radiator 47, and a bypass valve 48 located at the junction between the branch including the radiator 47 and the bypass branch. The component to be cooled is the second component 41 of the electric traction chain, namely a power electric battery. The bypass valve 48 allows regulation of the flow rate of heat transfer fluid circulating through the radiator 47 so that the thermal regulation of the second component 41 can be achieved by regulating the ambient air temperature according to the cooling requirement and the outside temperature of the vehicle. Preferably, the regulation temperature of the second component 41 is between 15°C and 25°C, preferably 18°C. The first heat exchange circuit 2 includes a means for interconnecting the first and second loops L2 and L4, fluidly linking the loops together. This interconnection means includes a branch 44, which is a supply line to the second thermal control loop L4, and a branch 45, which is a discharge line to the second thermal control loop L4.

[0017] The regulation temperature of the component to be cooled, respectively the cabin air and the power battery, is lower in the second thermal regulation loop L4 compared to the first thermal regulation loop L2.

[0018] The first circuit 2 further includes a means for controlling the flow 42 circulating from the first thermal regulation loop L2 to the second thermal regulation loop L4. According to an embodiment illustrated in [Fig. 1], the flow control means 42 is a proportional three-way control valve 42a. The valve 42a is located at a junction between the supply line 44 of the second thermal control loop L4 and the first thermal control loop L2, said junction being located at the outlet of the air exchanger 21 of the first thermal control loop L2. The three-way valve 42a comprises one inlet and two outlets, one of the outlets being connected to the inlet of the cooler 14, the other of the outlets being connected to the supply branch 44 of said interconnection means for the first and second thermal control loops L2, L4. According to an alternative embodiment shown in [Fig. 2], the flow control means 42 is a proportional two-way control valve 42b. The valve 42b is located at the supply line 44 connecting the first thermal control loop L2 to the second thermal control loop L4. According to the embodiment variant of [Fig.2], the bypass branch 46 comprises two junction nodes 43, each being in fluidic relationship with the interconnection means of the first and second loops L2, L4, respectively with the discharge line 45 and the supply line 44. To assist the regulation of the exchange flow rate Q5 between the two loops L2 and L4 by the two-way valve 42b, by the two lines 44 and 45, a flow adjustment means 49 is disposed between these two lines at the level of the second control loop L4, in particular between the two junction nodes 43, and at the level of the first control loop L2, in particular at the level of the branch connecting the air heater 21 to the cooler 14.

[0019] Upon exiting the heat exchanger 21, the flow Q2 can go towards branch 44 or towards the cooler 14, circulating through the branch comprising the junction with the degassing device 22. The flow rate is adjusted by a control means 49 located at the branch containing the vessel 22, which aims to reduce the permeability of this branch, in order to direct a portion of the flow Q2 towards branch 44 of the interconnecting means. The same principle is applied to the flow Q4 of the bypass branch 46: upon reaching the first node 43, the reduction in cross-sectional area achieved by the adjustment means 49, located between the nodes 43, promotes fluid circulation towards the discharge pipe 45, thus creating the exchange flow rate. Q5 between the first and second thermal regulation loops L2 and L4. Depending on the pressure distribution in the two loops L2 and L4, at least one of the adjustment means 49 assists the 2-way valve in regulating the target exchange flow Q5.

[0020] The use of a 3-way valve, as shown in [Fig. 1], does not require the use of an adjustment means, because the design of the 3-way valve includes a means for restricting flow to the branch where the degassing device 22 is located. The thermal management device also includes a second heat exchange circuit 3 which is in direct thermal contact with the gas cooler 11 of the phase-change fluid circuit 1. This heat exchange link between the gaseous carbon dioxide exiting the compressor 10 under pressure and the second heat exchange circuit 3 aims to condense the carbon dioxide into a high-pressure liquid. Upon exiting the gas cooler in a high-pressure liquid state, the carbon dioxide passes through the expansion valve 13 and then enters the heat exchanger 14, where it evaporates, cooling the fluid in the first circuit 2. The second heat exchange circuit 3 can be a thermal loop L3 comprising, in series, a pump 30, the gas cooler 11 of the phase-change fluid circuit 1, the first component 32 to be cooled of the drive train 32, and the air-cooled radiator 31 for the heat transfer fluid, taken in that order during the operation of the water pump 30. Upstream of the pump 30, a branch of the thermal loop L3 provides a connection to a non-through-flow degassing device, comprising a degassing chamber 33. The nominal regulation temperature of the first component of the traction chain, which is preferably of the type of an electric traction motor of the vehicle, is higher than that of the second component 41 located in the second loop L4 of the first heat exchange circuit 2.

[0021] In [Fig. 3], the thermal management device includes an air-based temperature control system for the outlet temperature of the air heater 21. The four diagrams illustrate the different operating modes of this system according to different cabin cooling requirements. The system includes a fan 212 and hinged flaps 211, the latter being able to partially or completely block the airflow through the air heater 21 due to their positioning within the air heater 21's beam. The flaps can be positioned between the fan 212 and the air heater 21, depending on the airflow direction. Depending on the cabin cooling requirement, which can be expressed as a ventilation power requirement, the fan speed and the positioning of the movable flaps are modified.Thus, depending on the cooling power requirement P for the passenger compartment, which is between a minimum power Pmin and a maximum power Pmax, the . flaps can be placed at the right of the bypass openings of the air heater and / or at the right of the air heater beam in such a way that the airflow to the passenger compartment passes totally through the bypass openings of the air heater, the air heater beam, or partially through the bypass openings of the air heater and the air heater beam 21. The assembly consisting of the fan, the flaps and the air heater is preferably located in an air conditioning unit.

[0022] In [Fig. 4], the thermal management device may include an alternative embodiment of the temperature control system at the outlet of the air heater 21. The three diagrams illustrate the different operating modes of this system depending on the cooling capacity of the passenger compartment. In this case, the system includes a bypass valve 21a located upstream of the air heater 21, as well as a bypass branch 21b of the air heater 21. Depending on the passenger compartment cooling requirement, which can be expressed by a temperature of the heat transfer fluid at the outlet of the air heater 21, the bypass valve 21a is controlled. Depending on the power requirement between minimum and maximum, the bypass valve 21a allows the quantity of heat transfer fluid circulating in the air heater 21 to be adapted according to a total flow, a partial flow or an interruption of the flow of the heat transfer fluid within the air heater 21.Total flow means a complete stoppage of flow in the bypass branch 21b. Partial flow means a flow of the heat transfer fluid both in the bypass branch 21b and inside the air heater 21. The term flow interruption means a complete flow of the heat transfer fluid in the bypass branch 21b.

[0023] The assembly consisting of the bypass valve 21a and the bypass branch 21b can then be located outside the air conditioning unit, which makes it compact, in particular more compact than in the embodiment of [Fig.3].

[0024] The thermal management device of the invention further comprises software means, for example a computer 50 containing control laws to enable the operation of the pumps 20, 30, 40, the bypass valves 48, and the flow control means 42 to be performed according to at least one measured temperature T4 upstream of the second component 41 to be cooled in the electric traction chain. A temperature sensor 51 performs the measurement of the temperature T4.

[0025] Pumps 20, 30 and 40 generate flow rates Q2, Q3 and Q4 of cooling fluid respectively. The operating procedure of the thermal management device will now be detailed. The main loop L1 can be considered an ultra-compact refrigeration unit, in which the high-pressure supercritical gaseous refrigerant enters the expansion valve 13, causing its pressure to drop. The gas becomes vapor and then liquefies. Upon entering the cooler 14, which can be considered an evaporator, the liquid carbon dioxide absorbs heat from the heat transfer fluid of the first thermal regulation loop L2. During this heat exchange, the carbon dioxide evaporates and returns to a gaseous state. Upon exiting the cooler 14, it passes through the expansion valve 13 again, but via a downstream section, known as the expansion valve outlet, which is distinct from the upstream section of the expansion valve through which the carbon dioxide flows before circulating through the cooler.As carbon dioxide flows through the upstream and downstream sections of the expansion valve with different fluid pressures, its temperature is captured to more precisely control the expansion valve 13. The gas then passes into the reservoir 12 where the liquid is retained and the vapor is drawn into the compressor 10 to be compressed and increase its pressure. This compression also increases the gas temperature. The high-pressure gas then passes into the gas cooler 11 where it is cooled by the heat transfer fluid of the thermal loop L3 of the second heat exchange circuit. In this exchanger, the pressure is above the critical pressure, and the carbon dioxide remains in a gaseous state. The heat recovered by the fluid in the thermal loop L3 can be used to heat the electric motor 32, or another component requiring heating, in winter, or released into the ambient air in summer if this heat is not needed, via the radiator 31.The refrigerant in a high-pressure gaseous state enters the expansion valve where its pressure drops to become vapor, then liquefies at the outlet before entering the heat exchanger 14 and thus continuing the thermodynamic cycle.

[0026] The first control loop L2 is in direct contact with the cooler 14 of the phase-change fluid circuit 1. The temperature of the first control loop L2 is between 0 and 5°C to ensure cooling of the passenger compartment by the heat exchanger 21. The pump 20 is controlled by the control unit 50 to ensure a sufficient flow rate Q2 according to the passenger compartment's air conditioning demand, which depends on at least one other parameter chosen from among the ambient temperature, the degree of sunlight, and the passenger compartment volume, among others. The control valve 42a, controlled by the control unit 50, allows a constant flow rate Q2 in the heat exchanger 2, except at the branch of the circuit connecting the valve 42a and the degassing chamber 22. This difference in flow rate will be detailed below.

[0027] The thermal loop L3 has the main role of cooling the fluid circulating in the gas cooler 11 of the phase-change fluid circuit 1, via the water circulating within the second heat exchange circuit 3. The radiator 31 also has the role of cooling the other components of the electric traction chain 32, such as the electric motor, power electronics etc. In winter, the L3 thermal loop can also heat the passenger compartment, as well as the traction battery via the first heat exchange circuit 2.

[0028] The second loop L4 of the first heat exchange circuit 2 provides cooling for battery 41. Battery 41 can be cooled either by a water plate or by a dielectric fluid in which the battery is immersed. The temperature T4 of the water at the inlet of battery 41 is precisely regulated by the device of the invention. In this loop, there is a second pump 40 which provides a flow rate Q4 to the second component 41 of the powertrain to be cooled, namely battery 41, as well as a bypass valve 48, in particular a three-way type, which allows selection of the branch containing a radiator 47 designed to cool the battery without air conditioning in order to reduce energy consumption.This selection can take place for example in winter or when the ambient temperature is quite low, or simply when the battery temperature is quite high and the water cooled by the radiator is sufficient to maintain optimal battery operating conditions, for example while driving on the motorway where the air speed is high to allocate the required performance to the radiator to cool the 4L battery. The bypass valve 48 allows selection of branch 46 to bypass the radiator and connect the first and second control loops together so that the heat transfer fluid draws cooling from the cooler 14. During the cooling of the coil 41 by the heat transfer fluid circulating through the first thermal control loop L2, the flow control device 42 allows the transfer of a portion of the flow Q2 at a very low temperature T2 to the junction 43 where this very cold water mixes with the relatively warm water exiting the coil. The temperature T4 of the water destined for the coil 41 is a mixture of the temperature T5 of the water exiting the coil 41 and the temperature T2 of the water exiting the air heater 21. The exact value of the temperature T4 also depends on the flow rate Q5 in branch 44 of said interconnection means, and on the flow rate Q4: -r- _ ^5 *^5 4 z *

[0029] In this formula, the flow rate Q4 and the temperature T5 of the second thermal regulation loop L4 depend primarily on the cooling demand of battery 41 imposed by the battery cooling specifications. It follows that the control means 50 is capable of regulating a flow rate Q5 by the flow control means 42 in order to obtain precisely, and without temperature oscillation, a T4 battery cooling temperature using the measured T2 and T5 temperature values.

Claims

Demands

1. Thermal management device for a vehicle, in particular an electric vehicle comprising at least one powertrain element and a vehicle passenger compartment to be thermally regulated, the thermal management device comprising a phase-change fluid circuit (1) of the carbon dioxide type, the circuit (1) being connected by a first heat exchanger (14) to a first heat exchange circuit (2), said first heat exchanger (14) being in particular an evaporator (14), the circuit (1) being connected by a second heat exchanger (11) to a second heat exchange circuit (3), said second heat exchanger (11) being in particular a gas cooler (11), each of the first and second heat exchange circuits (2, 3) comprising a means for controlling the flow of a water-type heat transfer fluid, such that said first and second heat exchangers (11,14) are respectively of the type of a carbon dioxide / water cooler and a liquid carbon dioxide evaporator, characterized in that the first heat exchange circuit (2) comprises a first thermal control loop (L2) and a second thermal control loop (L4) connected to each other via an interconnection means comprising branches (44, 45) such that one of the branches (44, 45) is a supply line to the second thermal control loop (L4), and the other of the branches (44, 45) is a discharge line to the second thermal control loop (L4).

2. Device according to claim 1, characterized in that the phase change fluid is carbon dioxide, the components of the device comprise means for resisting pressure of about 125 bar and means for resisting temperature of 150°C.

3. A device according to claim 1 or 2, characterized in that the phase-change fluid circuit (1) comprises a compressor (10), a gas cooler (11), an expansion valve (13), and an evaporator (14), arranged in that order within a loop main (Ll) of circulating fluid by starting the compressor (10).

4. Device according to any one of the preceding claims, characterized in that the second heat exchange circuit (3) comprises a thermal loop (L3) in which are included at least the gas cooler (11), a radiator (31) and a water pump (30) arranged respectively in that order when the water pump (30) is started, the thermal loop (L3) of the second heat exchange circuit (3) being in particular a third thermal loop of the device (1).

5. Device according to the preceding claim, characterized in that the second heat exchange circuit (3) further comprises at least one first component (32) of an electric traction chain located at a branch connecting the gas cooler (11) to the radiator (31), and / or a degassing jar (33) located at a branch connecting the radiator (31) to the water pump (30).

6. Device according to any one of the preceding claims, characterized in that it comprises a flow control means (42) circulating from the first thermal regulation loop (L2) to the second thermal regulation loop (L4).

7. Device of any one of the preceding claims, characterized in that the first thermal regulation loop (L2) includes an air exchanger (21) intended to be traversed by an airflow to be cooled for the vehicle's passenger compartment.

8. Device according to any one of the preceding claims, characterized in that the second thermal regulation loop (L4) comprises a second component (41) of an electric traction chain, in particular an electric battery, or a dielectric fluid cooler which is intended for cooling the second component (41) of the electric traction chain, in particular the cells of an electric battery.

9. Device according to any one of the preceding claims, characterized in that the second thermal regulation loop (L4) comprises a pump (40), the second component (41) to be cooled of the electric traction chain, a radiator (47), a bypass branch (46) of the radiator (47), and a bypass valve (48) located at the junction between the branch comprising the radiator (47) and the bypass branch (46).

10. Vehicle, in particular of the electrically powered type, characterized in that it comprises the thermal management device (1) according to any one of claims 1 to 9.

11. A method for cooling at least one element of the powertrain and a passenger compartment of a vehicle according to the preceding claim, characterized in that it comprises the steps of implementing the following thermal controls: - of the phase-change fluid circuit (1), such that, when passenger compartment cooling is required, the temperature (TJ) of the coolant at the outlet of the evaporator (14) is approximately on the order of zero degrees Celsius, by controlling the operation of the compressor (10) and / or the expansion valve (13) and / or the gas cooler (11) - of the second heat exchange circuit (3) by a control of the operation of the water pump (30) - of the first loop (L2) of the first heat exchange circuit such that the temperature (T2) of the heat transfer fluid at the outlet of the air exchanger (21) is between 0 and 5 degrees Celsius when cooling of the passenger compartment is requested, by a control of the operation of the water pump (20) and / or positioning of flaps (211) for adjusting an air flow through the cooler (21) and / or a bypass valve (21b) of the cooler (21) - of the second loop (L4) of the first heat exchange circuit such that the temperature (T4) of the coolant at the level of the second component (41) to be cooled is greater than or equal to the temperature (T2) of the heat transfer fluid at the outlet of the air exchanger (21), while being between 10 and 30 degrees Celsius, preferably 18 degrees Celsius, by a control of the operation of the water pump (40) and / or a bypass valve (48).

Images