Heat transfer fluid circuit

Abstract

Heat transfer fluid circuit (100) comprising a first fluid circulation loop (10), said first loop (10) comprising a first pump (11) and a plurality of heat exchangers (12, 13, 14), said circuit comprising a second fluid circulation loop (20), said second loop comprising a second pump (21) and a plurality of heat exchangers (22, 23), said circuit comprising a plurality of branches (30, 40), each of said branches connecting said first and second loops to each other at different locations, at least one of said first and second pumps being a reversible flow pump, said circuit comprising non-return devices (50a, 50b),said circuit being configured to switch from a first operating mode corresponding to a first circulation of the fluid to another operating mode corresponding to a second circulation of the fluid by controlling the direction of fluid flow using said pumps. Figure for the abbreviation: Figure 1,

Description

Title of the invention: Heat transfer fluid circuit Technical field of the invention

[0001] The invention relates to the field of motor vehicles and more particularly to a heat transfer fluid circuit for a hybrid or electric motor vehicle. Technical background

[0002] In hybrid and electric vehicles, the thermoregulation of the passenger compartment and / or of various components uses, directly and / or indirectly, a heat transfer fluid circuit. To equip these circuits, single-way pumps and multi-way valves, for example three-way, have already been proposed, which allow several operating modes to be achieved.

[0003] Nevertheless, these multi-way valves are electronically controlled and the complexity of the associated circuits leads to a high level of complexity in their control.

[0004] One of the aims of the present invention is therefore to at least partially remedy the drawbacks of the prior art and to propose an improved circuit. Summary of the invention

[0005] The present invention relates to a heat transfer fluid circuit comprising a first heat transfer fluid flow loop, this first loop comprising a first pump and a plurality of heat exchangers, the circuit further comprising a second heat transfer fluid flow loop, this second loop comprising a second pump and a plurality of heat exchangers, the circuit further comprising a plurality of branches, each of the branches connecting the first and second loops together at different locations, at least one of the first and second pumps being a reversible flow pump, the circuit further comprising non-return members, the circuit being configured to switch from a first operating mode corresponding to a first circulation of the fluid to another operating mode corresponding to another circulation of the fluid by controlling a direction of flow of the fluid using the pumps.

[0006] Thus, thanks to the invention, a simplification of the heat transfer fluid circuit is ensured while preserving a large number of the functionalities offered by a conventional circuit with multi-way valves. Indeed, the joint use of a reversible flow pump on one of the loops with non-return members makes it possible to switch from one operating mode to another easily.

[0007] Thanks to the invention, a reduction in costs is also ensured. In fact, the non-return devices have the particularity of being purely mechanical and do not require being supported by a control device to influence the circulation of the fluid.

[0008] The heat transfer fluid circuit according to the invention may comprise one or more of the following characteristics, taken in isolation from one another or in combination with one another: - the heat exchangers of the first loop comprise a device for electrically heating the heat transfer fluid, a heat exchanger, called a bi-fluid heat exchanger, allowing heat exchange between the heat transfer fluid and another fluid and a heat exchanger, called a battery heat exchanger, allowing thermoregulation of an electrical energy storage device using the heat transfer fluid; - the heat exchangers of the second loop comprise a heat exchanger, called a machine, allowing thermoregulation of a machine and / or electrical components using the heat transfer fluid and a radiator, allowing heat exchange between the heat transfer fluid and an air flow; - the first pump is monodirectional and the second pump is reversible; - the plurality of branches comprises a first and a second branch; - the first loop is configured so that the fluid flows successively, in this order, in the first pump, the electric heating device, the battery heat exchanger and the bi-fluid heat exchanger according to a first direction of flow of the fluid in the first loop; - the second loop is configured so that the fluid flows successively, in this order, in the second pump, the radiator and the “machine” heat exchanger according to a second direction of flow of the fluid in said second loop; - the circuit is configured so that fluid circulation can take place alternately:

[0009] only in the first loop in the first flow direction, only in the second loop in the second flow direction, independently in the first loop, in the first flow direction, and in the second loop, in the second flow direction, in the first loop and a portion of the second loop, with a fluid passage between the first loop and said portion of the second loop, the fluid circulating in a third flow direction, opposite to the second flow direction, in the second loop, and / or in a portion of the first loop and said portion of the second loop, with a fluid passage between said portion of the first loop and said portion of the second loop, the fluid flowing in the third direction of flow, opposite to the second direction of flow, in the second loop; - the first loop comprises, according to the first direction of flow of the fluid, a point of divergence located downstream of the dual-fluid exchanger and upstream of the first pump and a point of convergence located downstream of the battery heat exchanger and upstream of the dual-fluid exchanger; - the second loop comprises, according to the second direction of flow of the fluid, a first connection point located downstream of the second pump and upstream of the radiator and a second connection point located downstream of the radiator and upstream of the machine heat exchanger; - the first branch connects the divergence point of the first loop to the first connection point of the second loop; - the second branch connects the second connection point of the second loop to the convergence point of the first loop; - the second loop comprises at least one of the non-return members; - the non-return device of the second loop is located between the radiator and the second connection point according to the second direction of flow of the fluid in the second loop; - the non-return member of the second loop is configured to allow the fluid to flow in the second direction of flow of the fluid; - the second branch includes a second of the non-return organs; - the non-return device of the second branch is configured to allow flow the fluid from the second loop to the first loop, the second pump driving the fluid in the third flow direction, opposite to the second flow direction; - the bi-fluid heat exchanger is configured so that the other fluid is a refrigerant of a circuit allowing the refrigerant to execute a thermodynamic cycle, the bi-fluid heat exchanger fulfilling the function of evaporator of the refrigerant using calories transferred by the heat transfer fluid to the refrigerant.

[0010] The invention also relates to a thermal management system for a hybrid or electric vehicle comprising at least one heat transfer fluid circuit as described above. Brief description of the figures

[0011] Other characteristics and advantages of the invention will appear during the reading of the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

[0012] [Fig-1] schematically illustrates an example of a heat transfer fluid circuit according to the invention,

[0013] [Fig.2] schematically illustrates a first and a second mode of operation operation of the circuit of [Fig.l],

[0014] [Fig.3] schematically illustrates a third mode of operation of the circuit of [Fig.l],

[0015] [Fig.4] schematically illustrates a fourth mode of operation of the circuit of [Fig.l],

[0016] [Fig.5] schematically illustrates a fifth mode of operation of the circuit of [Fig.l],

[0017] [Fig.6] schematically illustrates a sixth mode of operation of the circuit of [Fig.l],

[0018] [Fig.7] schematically illustrates a seventh mode of operation of the circuit of [Fig.l],

[0019] [Fig.8] schematically illustrates an eighth mode of operation of the circuit of [Fig.l],

[0020] [Fig.9] schematically illustrates a ninth mode of operation of the circuit of [Fig.l], and

[0021] [Fig. 10] schematically illustrates a tenth mode of operation of the circuit of [Fig.l].

[0022] In these figures, the same reference corresponds to identical or similar elements. Detailed description of the invention

[0023] With reference to [Fig.l], the invention relates to a heat transfer fluid circuit 100 comprising a first loop 10 for circulating the heat transfer fluid, the first loop 10 comprising a first pump 11 and a plurality of heat exchangers 12, 13, 14. The circuit 100 further comprises a second loop 20 for circulating the heat transfer fluid, the second loop 20 comprising a second pump 21 and a plurality of heat exchangers 22, 23. The circuit 100 further comprises a plurality of branches 30, 40, each of these branches 30, 40 connecting the first loop 10 and the second loop 20 to each other at different locations.

[0024] At least one of the first and second pumps 11, 21 is a reversible flow pump. The circuit 100 further comprises non-return members 50a, 50b.

[0025] The circuit 100 is configured to switch from a first operating mode corresponding to a first circulation of the fluid to another operating mode corresponding to another circulation of the fluid by controlling a flow direction F1, F2, F3 of the fluid using the pumps 11, 21. This means that at least one of the pumps is reversible and allows the fluid to circulate alternately in one direction or in another through the pump in question and therefore in the associated circuit.

[0026] In the example of [Fig.l], the heat exchangers 12, 13, 14 of the first loop 10 comprise an electric heating device 12 for the heat transfer fluid, a heat exchanger 14, called bi-fluid, allowing heat exchange between the heat transfer fluid and another fluid, and a heat exchanger 13, called batteries, allowing thermoregulation of an electrical energy storage device using the heat transfer fluid.

[0027] This means an exchanger allowing both direct and indirect heat exchange with the electrical energy storage device.

[0028] In other words, according to a first variant, said heat exchanger 13 of the electrical energy storage device is integrated into this storage device and allows the heat transfer fluid to pass through the storage device while cooling or heating it. The heat transfer fluid is then preferably a dielectric fluid in order to be able to be brought into contact with the electrical components of the electrical energy storage device.

[0029] According to another variant, not illustrated, a specific thermal regulation circuit of the electrical energy storage device is provided. The specific circuit comprises the heat exchanger 13 of the electrical energy storage device and this storage device as well as a specific pump for driving a thermal regulation fluid flowing through the specific circuit. The exchanger 13 of the electrical energy storage device is then intended for a heat exchange between the heat transfer fluid and the thermal regulation fluid. The thermal regulation fluid is then preferably a dielectric fluid and the heat transfer fluid is advantageously water with added antifreeze.

[0030] The electrical energy storage device is formed, for example, of one or more electric batteries.

[0031] Furthermore, the bi-fluid heat exchanger 14 is configured so that the other fluid is a refrigerant of a circuit, not shown, allowing the refrigerant to execute a thermodynamic cycle. The bi-fluid heat exchanger 14 then fulfills the function of evaporator of the refrigerant using calories transferred by the heat transfer fluid to the refrigerant.

[0032] The heat exchangers 22, 23 of the second loop 20, themselves, comprise a heat exchanger 23 called machine, allowing thermoregulation of a machine and / or electrical components using the heat transfer fluid, and a radiator 22 allowing heat exchange between the heat transfer fluid and an air flow, in particular an air flow, called external, entering under a hood of the vehicle. As for the battery heat exchanger 13, the machine heat exchanger 23 allows direct thermoregulation of the machine and / or electrical components if the heat transfer fluid- The heat transfer fluid of the heat transfer fluid circuit 100 is a dielectric fluid. Alternatively, for example if the heat transfer fluid of the heat transfer fluid circuit 100 is a mixture of water and antifreeze, a specific thermoregulation fluid circuit is provided, possibly the same as for the electrical energy storage device.

[0033] It is understood that the different heat exchangers 12, 13, 14, 22, 23 of each of the loops 10, 20 can be active or inactive, that is to say, allow a heat exchange or not. It is also understood that the first and second pumps 11, 21 can be active or inactive. The term "active" then means that the pump in question is in operation while the term "inactive" means that the pump in question is not in operation. An inactive element can be considered as being absent from the circuit.

[0034] The first loop 10 is advantageously configured so that the fluid flows successively, in this order, in the first pump 11, the electric heating device 12, the battery heat exchanger 13 and the bi-fluid heat exchanger 14 according to a first flow direction F1 of the heat transfer fluid in the first loop 10 (see for example [Fig.2]).

[0035] The second loop 20 is advantageously configured so that the fluid flows successively, in this order, in the second pump 21, the radiator 22 and the machine heat exchanger 23 according to a second flow direction F2 of the fluid in the second loop 20 (see for example [Fig.5]).

[0036] Advantageously, the first pump 11 of the first loop 10 is monodirectional, that is to say that it only allows the circulation of the fluid in a single flow direction. Advantageously, the second pump 21 is reversible, that is to say that the second pump 21 allows the circulation of the fluid in a given flow direction in a first operating mode of the second pump 21 but also in the opposite direction in a second operating mode of the second pump 21.

[0037] The first loop 10 comprises, according to the first direction of flow F1 of the fluid, a point of divergence 15 located here downstream of the bi-fluid exchanger 14 and upstream of the first pump 11 and / or a point of convergence 16 located here downstream of the battery heat exchanger 13 and upstream of the bi-fluid exchanger 14.

[0038] The second loop 20 comprises, according to the second flow direction F2 of the fluid, a first connection point 24 located here downstream of the second pump 21 and upstream of the radiator 22 and / or a second connection point 25 located here downstream of the radiator 22 and upstream of the machine heat exchanger 23.

[0039] Advantageously, the plurality of branches 30, 40 of the circuit 100 comprises a first branch 30 and a second branch 40. Thus, in the example of [Fig. 1], the first branch 30 connects the divergence point 15 of the first loop 10 to the first connection point 24 of the second loop 20. Still in this example of [Fig.l], the second branch 40 connects the second connection point 25 of the second loop 20 to the convergence point 16 of the first loop 10.

[0040] Advantageously, the second branch 40 comprises a 50a of the non-return members. This non-return member 50a of the second branch 40 can be configured to allow the fluid to flow from the second loop 20 to the first loop 10. In such a case, the second pump 21 drives the fluid in a third flow direction F3 which is then opposite to the second flow direction F2 in the second loop 20 (see for example [Fig.8]). It is understood that to pass from the second flow direction F2 to the third flow direction F3, the second pump 21 is, as already said, a reversible pump.

[0041] Advantageously, the second loop 20 comprises at least one 50b of the non-return members. This non-return member 50b of the second loop 20 may be located between the radiator 22 and the second connection point according to the second flow direction F2 of the fluid in the second loop 20. Advantageously, this non-return member 50b of the second loop 20 is configured to allow the fluid to flow according to the second flow direction F2 of the fluid.

[0042] The circuit 100 of [Fig.l] is advantageously configured so that a circulation of the fluid can take place alternately: - only in the first loop 10 according to the first flow direction Fl, - only in the second loop 20 according to the second flow direction F2, - independently in the first loop 10, according to the first flow direction F1, and in the second loop 20, according to the second flow direction F2, - in the first loop 10 and a portion 20' of the second loop 20, with a fluid passage between the first loop 10 and this portion 20' of the second loop 20, the fluid circulating in a third flow direction F3, opposite to the second flow direction F2, in the second loop 20, and / or - in a portion 10' of the first loop 10 and the portion 20' of the second loop 20, with a fluid passage between the portion 10' of the first loop 10 and the portion 20' of the second loop 20, the fluid circulating in the third flow direction F3, opposite to the second flow direction F2, in the second loop 20.

[0043] It is also noted that the circuit 100 comprises an expansion tank, for example located on the first loop 10.

[0044] In the following, reference is made to Figures 2 to 10 which illustrate different modes of operation permitted by the heat transfer fluid circuit 100 as described above. In Figures 2 to 10, the pipes in which the heat transfer fluid is moving will be represented in bold lines and the pipes in which the heat transfer fluid is not moving will be represented in dotted lines. Similarly, the elements shown in dotted lines are inactive.

[0045] [Fig. 2] simultaneously illustrates a first and a second mode of operation of the circuit 100 according to the invention. In these two modes of operation, the circulation of the fluid takes place only in the first loop 10 in the first direction of flow F1. It is therefore understood that the second pump 21 of the second loop 20 is inactive. In addition, the heat exchangers 22, 23 of the second loop 20 are also inactive since no heat exchange takes place, due to the lack of circulation of the heat transfer fluid in the exchangers in question. In these two modes of operation, the electric heating device 12 of the first loop 10 is inactive. Thus, the first pump 11 circulates the heat transfer fluid in the first direction of flow F1 through the battery heat exchanger 13 and the dual-fluid heat exchanger 14.

[0046] In this way, in the first operating mode, the heat transfer fluid draws calories from the electrical energy storage device by means of the battery heat exchanger 13 to cool the electrical energy storage device. These drawn calories are then recovered by the bi-fluid heat exchanger 14 which dissipates them in the refrigerant circuit.

[0047] In the second operating mode, the bi-fluid heat exchanger 14 supplies calories to the heat transfer fluid by taking them from the refrigerant circuit. These calories are recovered by the battery heat exchanger 13 in order to heat the electrical energy storage device.

[0048] [Fig. 3] illustrates a third mode of operation of the circuit 100 according to the invention. In this third mode of operation, the circulation of the fluid takes place only in the first loop 10 in the first flow direction FL. As for [Fig. 2], it is understood that the second pump 21 and the heat exchangers 22, 23 are inactive. In this mode, the dual-fluid heat exchanger 14 is inactive due to an absence of circulation of the refrigerant fluid inside said dual-fluid heat exchanger. Thus, the first pump 11 circulates the heat transfer fluid in the first flow direction F1 through the electric heating device 12 and the battery heat exchanger 13. In this way, the electric heating device 12 supplies calories to the heat transfer fluid which delivers them via the battery heat exchanger 13 to the electrical energy storage device to heat it.

[0049] [Fig. 4] illustrates a fourth mode of operation of the circuit 100 according to the invention. In this fourth mode of operation, the circulation of the fluid takes place only in the first loop 10 according to the first flow direction F1. As previously, it is understood that the second pump 21 and the heat exchangers 22, 23 are inactive. Thus, the first pump 11 circulates the heat transfer fluid according to the first flow direction F1 through the electric heating device 12, the battery heat exchanger 13 and the bi-fluid heat exchanger 14.

[0050] In this way, the heating device 12 provides calories to the heat transfer fluid circulated by the first pump 11. A portion of these calories is transmitted to the electrical energy storage device via the battery heat exchanger 13, another portion of these calories is transmitted to the refrigerant fluid via the dual-fluid heat exchanger 14. Such an operating mode makes it possible, for example, to heat an air flow, called an internal air flow intended for the passenger compartment of the vehicle, via the refrigerant fluid circuit. The circulating heat transfer fluid then returns to the first pump 11 to be heated again by the heating device 12.

[0051] [Fig. 5] illustrates a fifth mode of operation of the circuit 100 according to the invention. In this fifth mode of operation, the circulation of the fluid takes place independently in the first loop 10, according to the first flow direction F1, and in the second loop 20, according to the second flow direction F2. In the particular case of [Fig. 5], the second flow direction F2 of the second loop 20 is opposite to the first flow direction F1 of the first loop 10. Furthermore, the electric heating device 12 of the first loop is inactive. Thus, in the first loop 10, the first pump 11 circulates the heat transfer fluid according to the first flow direction F1 through the battery heat exchanger 13 and the dual-fluid heat exchanger 14.In the second loop, the second pump 21 circulates the heat transfer fluid in the second flow direction F2 through the radiator 22, the non-return member 50b and the machine heat exchanger 23.

[0052] It will be noted that a pressure differential between the first loop 10 and the second loop 20 makes it possible to prevent the heat transfer fluid of each of the loops from circulating in the branches 30, 40 connecting the two loops 10, 20.

[0053] In this way, in the first loop 10, the heat transfer fluid draws calories from the electrical energy storage device by means of the battery heat exchanger 13 to cool the electrical energy storage device. These drawn calories are then recovered by the bi-fluid heat exchanger 14 and dissipated in the refrigerant circuit. Whereas, in the second loop 20, the heat transfer fluid draws calories from the machine via the machine heat exchanger 23. These drawn calories are then recovered by the radiator 22 to dissipate them in the external air flow.

[0054] [Fig.6] illustrates a sixth mode of operation of the circuit 100 according to the invention. In this sixth mode of operation, the circulation of the fluid takes place independently in the first loop 10, in the first flow direction F1, and in the second loop 20, in the second flow direction F2. As previously, the second flow direction F2 is opposite to the first flow direction F1. Thus, in the first loop 10, the first pump 11 circulates the heat transfer fluid in the first flow direction F1 through the electric heating device 12, the battery heat exchanger 13 and the bi-fluid heat exchanger 14. In the second loop, the second pump 21 circulates the heat transfer fluid in the second flow direction F2 through the radiator 22, the non-return member 50b and the machine heat exchanger 23.

[0055] In this way, in the first loop 10, the heating device 12 provides calories to the heat transfer fluid circulated by the first pump 11. A portion of these calories is transmitted to the electrical energy storage device via the battery heat exchanger 13, another portion of these calories is transmitted to the refrigerant fluid via the dual-fluid heat exchanger 14. The circulating heat transfer fluid then returns to the first pump 11 to be heated again by the heating device 12. While, in the second loop 20, the heat transfer fluid takes calories from the machine via the machine heat exchanger 23, allowing the latter to cool. These taken calories are then recovered by the radiator 22 to dissipate them in the external air flow.

[0056] [Fig. 7] illustrates a seventh mode of operation of the circuit 100 according to the invention. In this seventh mode of operation, the circulation of the fluid takes place independently in the first loop 10, in the first flow direction F1, and in the second loop 20, in the second flow direction F2. As previously, the second flow direction F2 is opposite to the first flow direction FL. Thus, in the first loop 10, the first pump 11 circulates the heat transfer fluid in the first flow direction F1 through the electric heating device 12 and the battery heat exchanger 13, the dual-fluid heat exchanger 14 being inactive as in the third mode of operation. In the second loop, the second pump 21 circulates the heat transfer fluid in the second flow direction F2 through the radiator 22, the non-return member 50b and the machine heat exchanger 23.

[0057] In this way, in the first loop 10, the electric heating device 12 supplies calories to the heat transfer fluid which delivers them via the battery heat exchanger 13 to the electrical energy storage device to heat it. While, in the second loop 20, the heat transfer fluid takes calories from the machine via the machine heat exchanger 23. These taken calories are then recovered by the radiator 22 to dissipate them into the external airflow.

[0058] [Fig. 8] illustrates an eighth mode of operation of the circuit 100 according to the invention. In this eighth mode of operation, the circulation of the fluid takes place in the first loop 10 and a portion 20' of the second loop 20, with a passage of fluid between the first loop 10 and this portion 20' of the second loop 20, the fluid circulating in a third flow direction F3, opposite to the second flow direction F2, in the relevant part of the second loop 20. In other words, the third flow direction F3 goes in the same direction as the first flow direction F1. The portion 20' of the second loop is defined as being the portion of the second loop 20 extending between the first connection point 24 and the second connection point 25 and which comprises the second pump 21.

[0059] In the particular case of [Fig.8], in the first loop 10, the electric heating device 12 and the bi-fluid heat exchanger 14 are inactive. In the second loop 20, the radiator 22 is inactive because it is not crossed by the heat transfer fluid.

[0060] Thus, at the point of divergence 15, a portion of the heat transfer fluid is driven by the first pump 11 through the battery heat exchanger 13 while the other portion is driven by the second pump 21 in the third flow direction F3 in the first branch 30 and in the portion 20' of the second loop 20. The heat transfer fluid then circulates through the machine heat exchanger 23 in the portion 20' of the second loop 20 then in the second branch 40 through the non-return member 50a from the connection point 25 to the point of convergence 16, to join the first loop 10 and return to the point of divergence 15 in the first flow direction F1, this under the combined action of the first and second pumps 11, 21.

[0061] It will be noted that, in the second loop 20, the heat transfer fluid does not circulate outside the portion 20' of the second loop. This is made possible by the non-return member 50b of the second loop which allows circulation of the fluid only in the second flow direction F2.

[0062] In this way, in this eighth operating mode, the machine heat exchanger 23 provides calories to the heat transfer fluid. These calories are then recovered by the battery heat exchanger 13 in order to heat the electrical energy storage device.

[0063] [Fig. 9] illustrates a ninth mode of operation of the circuit 100 according to the invention. In this ninth mode of operation, as previously for the case of [Fig. 8], the circulation of the heat transfer fluid takes place in the first loop 10 and the same portion 20' of the second loop 20, with a passage of fluid between the first loop 10 and this portion 20' of the second loop 20, the fluid circulating in a third flow direction F3, opposite to the second flow direction F2, in the relevant part of the second loop 20.

[0064] In the particular case of [Fig.9], only the radiator 22 is inactive in the second loop 20.

[0065] In this way, in this ninth operating mode, the electric heating device 12 and / or the battery heat exchanger 13 and / or the machine heat exchanger 23 provide calories to the heat transfer fluid circulated by the first and second pumps 11, 21. These calories are then transmitted to the refrigerant fluid via the bi-fluid heat exchanger 14. The circulating heat transfer fluid then returns to the first and second pumps 11, 21 to be heated again by the electric heating device 12 and / or the battery heat exchanger 13 and / or the machine heat exchanger 23.

[0066] [Fig. 10] illustrates a tenth mode of operation of the circuit 100 according to the invention. In this tenth mode of operation, the circulation of the heat transfer fluid takes place in a portion 10' of the first loop 10 and the portion 20', defined previously, of the second loop 20, with a passage of fluid between the portion 10' of the first loop 10 and this portion 20' of the second loop 20, the fluid circulating in the third flow direction F3, opposite to the second flow direction F2, in the relevant part of the second loop 20. The portion 10' of the first loop 10 is defined as being the portion of the first loop 10 extending from the point of convergence 16 to the point of divergence 15 and not comprising the first pump 11.

[0067] In the particular case of [Fig. 10], in the first loop 10, the first pump 11 is inactive, as well as the electric heating device 12 and the battery heat exchanger 13. It is understood that the heat transfer fluid does not circulate between the point of divergence 15 and the point of convergence 16 in the first loop 10. Thus, only the second pump 21 is active and circulates the heat transfer fluid in the third flow direction F3 through the machine heat exchanger 23 in the portion 20' of the second loop 20, in the second branch 40 through the non-return member 50a from the connection point 25 to the point of convergence 16, through the bi-fluid heat exchanger 14 then in the first branch 30 from the point of divergence 15 to the connection point 24.

[0068] In this way, in this tenth operating mode, the machine heat exchanger 23 supplies calories to the heat transfer fluid circulated by the second pump 21. These calories are then transmitted to the refrigerant fluid via the bi-fluid heat exchanger 14. The circulating heat transfer fluid then returns to the second pump 21 to be heated again by the machine heat exchanger 23.

[0069] As a variant, not shown, identical operating modes can be obtained by reversing both the flow directions F1, F2, F3 and the non-return members 50a, 50b.

[0070] The invention also relates to a thermal management system for a hybrid or electric vehicle comprising a heat transfer fluid circuit as described above as well as, in particular, the thermoregulation fluid circuit(s) and / or the refrigerant fluid circuit mentioned above.

Claims

Claims

1. A heat transfer fluid circuit (100) comprising a first loop (10) for circulating the heat transfer fluid, said first loop (10) comprising a first pump (11) and a plurality of heat exchangers (12, 13, 14), said circuit (100) further comprising a second loop (20) for circulating the heat transfer fluid, said second loop comprising a second pump (21) and a plurality of heat exchangers (22, 23), said circuit (100) further comprising a plurality of branches (30, 40), each of said branches (30, 40) connecting said first loop (10) and second loop (20) together at different locations, at least one of said first and second pumps (11, 21) being a reversible flow pump, said circuit (100) further comprising non-return members (50a, 50b),said circuit (100) being configured to switch from a first operating mode corresponding to a first circulation of the fluid to another operating mode corresponding to another circulation of the fluid by controlling a flow direction (F1, F2, F3) of the fluid using said pumps (11, 21).,

2. Circuit (100) according to claim 1, configured so that a circulation of the fluid can take place alternately: - only in the first loop (10) in a first flow direction (F1), - only in the second loop (20) in a second flow direction (F2), - independently in the first loop (10), in the first flow direction (F1), and in the second loop (20), in the second flow direction (F2), - in the first loop (10) and a portion (20') of the second loop (20), with a fluid passage between the first loop and said portion (20') of the second loop, the fluid circulating in a third flow direction (F3), opposite to the second flow direction (F2), in the second loop, and / or - in a portion (10') of the first loop (10) and said portion (20') of the second loop (20),with a fluid passage between said portion (10') of the first loop and said portion (20') of the second loop, the fluid circulating in the third flow direction (F3), opposite to the second flow direction (F2), in the second, loop.

3. Circuit (100) according to claim 2, in which the first loop (10) is configured so that the fluid flows successively, in this order, in the first pump (11), an electric heating device (12), a heat exchanger (13), called batteries, and a bi-fluid heat exchanger (14) according to the first direction of flow (Fl) of the fluid in said first loop (10).

4. Circuit (100) according to any one of claims 2 or 3, in which the second loop (20) is configured so that the fluid flows successively, in this order, in the second pump (21), a radiator (22) and a heat exchanger (23), called machine, according to the second direction of flow (F2) of the fluid in said second loop (20).

5. Circuit (100) according to claim 3, in which the first loop (10) comprises, according to said first direction of flow (F1) of the fluid, a point of divergence (15) located downstream of the bi-fluid exchanger (14) and upstream of the first pump (11), and a point of convergence (16) located downstream of the battery heat exchanger (13) and upstream of the bi-fluid exchanger (14).

6. Circuit (100) according to claim 4, in which the second loop (20) comprises, according to said second direction of flow (F2) of the fluid, a first connection point (24) located downstream of the second pump (21) and upstream of the radiator (22) and a second connection point (25) located downstream of the radiator (22) and upstream of the machine heat exchanger (23).

7. A circuit (100) according to the combination of claims 5 and 6, wherein said plurality of branches (30, 40) comprises a first branch (30) and a second branch (40), said first branch (30) connects the divergence point (15) of the first loop (10) to the first connection point (24) of the second loop (20), and said second branch (40) connects the second connection point (25) of the second loop (20) to the convergence point (16) of the first loop (10).

8. A circuit (100) according to any one of claims 1 to 7, wherein the second loop (20) comprises at least a first of the non-return members (50b).

9. A circuit (100) according to claim 7, wherein the second branch (40) comprises a second of the non-return members (50a).

10. Thermal management system of a hybrid or electric vehicle comprising a heat transfer fluid circuit (100) according to any one of claims 1 to 9.

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