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 temperature control of the passenger compartment and / or various components relies, directly and / or indirectly, on a heat transfer fluid circuit. To equip these circuits, unidirectional pumps and multi-way valves, for example three-way valves, have already been proposed, allowing for several operating modes.

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

[0004] One of the aims of the present invention is therefore to remedy at least partially the disadvantages 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 branch connecting the first and second loops to each other at different points, at least one of the first and second pumps being a reversible flow pump, the circuit further comprising non-return devices, 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 a different circulation of the fluid by controlling the direction of fluid flow using the pumps,The circuit is configured so that fluid circulation can occur alternately:

[0006] - only in the first loop in the first direction of flow, - only in the second loop in the second direction of flow, - independently in the first loop, in the first direction of flow, and in the second loop, in the second direction of flow, - 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 flowing in a third direction of flow, opposite to the second direction of flow, 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,

[0007] characterized in that the second loop comprises, according to the second direction of fluid flow, 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.

[0008] Thus, thanks to the invention, the heat transfer fluid circuit is simplified while preserving many of the functionalities offered by a conventional circuit with multiport valves. Indeed, the combined use of a reversible flow pump on one of the loops with non-return devices allows for easy switching from one operating mode to another.

[0009] Thanks to the invention, a reduction in costs is also ensured. Indeed, the non-return devices have the particularity of being purely mechanical and do not require a control device to influence the flow of the fluid.

[0010] The heat transfer fluid circuit according to the invention may comprise one or more of the following features, taken individually or in combination with each other: - the heat exchangers of the first loop include an electric heating device for the heat transfer fluid, a heat exchanger, called a bi-fluid exchanger, allowing heat exchange between the heat transfer fluid and another fluid and a heat exchanger, called a battery, allowing thermoregulation of an electrical energy storage device using the heat transfer fluid; - the heat exchangers of the second loop include 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 airflow; - the first pump is unidirectional and the second pump is reversible; - the plurality of branches includes a first and a second branch; - the first loop is configured so that the fluid flows successively, in this order, through the first pump, the device electric heating, battery heat exchanger and dual-fluid heat exchanger according to a first direction of fluid flow in the first loop; - the second loop is configured so that the fluid flows successively, in this order, into the second pump, the radiator and the "machine" heat exchanger according to a second direction of fluid flow in said second loop; - the first loop includes, according to the first direction of fluid flow, a divergence point located downstream of the two-fluid exchanger and upstream of the first pump and a convergence point located downstream of the battery heat exchanger and upstream of the two-fluid 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 includes at least one of the first non-return devices; - the non-return valve of the second loop is located between the radiator and the second connection point according to the second direction of fluid flow in the second loop; - the non-return device of the second loop is configured to allow the fluid to flow in the second direction of fluid flow; - the second branch includes a second of the non-return devices; - the non-return device of the second branch is configured to let the fluid flows from the second loop to the first loop, the second pump driving the fluid in the third direction of flow, opposite to the second direction of flow; - The two-fluid heat exchanger is configured so that the other fluid is a refrigerant from a circuit allowing the refrigerant to perform a thermodynamic cycle, the two-fluid heat exchanger fulfilling the function of evaporator of the refrigerant using calories given by the heat transfer fluid to the refrigerant.

[0011] 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

[0012] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, for an understanding of which reference should be made to the accompanying drawings in which:

[0013] [Fig-1] schematically illustrates an example of a heat transfer fluid circuit according to the invention,

[0014] [Fig.2] schematically illustrates a first and a second mode of operation of the circuit of [Fig.1],

[0015] [Fig.3] schematically illustrates a third operating mode of the circuit of the [Fig.l],

[0016] [Fig.4] schematically illustrates a fourth mode of operation of the circuit of the [Fig.1],

[0017] [Fig.5] schematically illustrates a fifth mode of operation of the circuit of the [Fig.1],

[0018] [Fig.6] schematically illustrates a sixth operating mode of the circuit of the [Fig.l],

[0019] [Fig.7] schematically illustrates a seventh operating mode of the circuit of the [Fig.l],

[0020] [Fig.8] schematically illustrates an eighth operating mode of the circuit of the [Fig.l],

[0021] [Fig.9] schematically illustrates a ninth mode of operation of the circuit of the [Fig.1], and

[0022] [Fig. 10] schematically illustrates a tenth operating mode of the circuit of [Fig.1].

[0023] On these figs, the same reference corresponds to identical or similar elements. Detailed description of the invention

[0024] With reference to [Fig. 1], the invention relates to a heat transfer fluid circuit 100 comprising a first heat transfer fluid circulation loop 10, 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 heat transfer fluid circulation loop 20, 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 points.

[0025] At least one of the first and second pumps 11, 21 is a reversible flow pump. The circuit 100 further includes non-return devices 50a, 50b.

[0026] 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 Fl, 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 the other through the pump in question and therefore in the associated circuit.

[0027] In the example of [Fig.1], the heat exchangers 12, 13, 14 of the first loop 10 include an electric heating device 12 for the heat transfer fluid, a heat exchanger 14, called a bi-fluid exchanger, allowing heat exchange between the heat transfer fluid and another fluid, and a heat exchanger 13, called a battery exchanger, allowing thermoregulation of an electrical energy storage device using the heat transfer fluid.

[0028] This means an exchanger allowing both direct and indirect heat exchange with the electrical energy storage device.

[0029] In other words, according to a first embodiment, the 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, cooling or heating it. The heat transfer fluid is then preferably a dielectric fluid so that it can be brought into contact with the electrical components of the electrical energy storage device.

[0030] According to another, unillustrated, variant, a specific thermal regulation circuit for the electrical energy storage device is provided. This specific circuit includes the heat exchanger 13 of the electrical energy storage device and the storage device itself, as well as a specific pump for circulating a thermal regulation fluid within the specific circuit. The heat exchanger 13 of the electrical energy storage device is then intended for heat exchange between the heat transfer fluid and the thermal regulation fluid. The thermal regulation fluid is preferably a dielectric fluid, and the heat transfer fluid is advantageously water with added antifreeze.

[0031] The electrical energy storage device is formed, for example, of one or more electric batteries.

[0032] Furthermore, the two-fluid heat exchanger 14 is configured so that the other fluid is a refrigerant from a circuit, not shown, allowing the refrigerant to perform a thermodynamic cycle. The two-fluid heat exchanger 14 then acts as an evaporator for the refrigerant using heat transferred from the heat transfer fluid to the refrigerant.

[0033] The heat exchangers 22, 23 of the second loop 20, for their part, include a heat exchanger 23, referred to as a machine, allowing thermoregulation of a The machine and / or electrical components are heated using the heat transfer fluid, and a radiator 22 allows heat exchange between the heat transfer fluid and an airflow, in particular an external airflow entering under the vehicle's hood. As with the battery heat exchanger 13, the machine heat exchanger 23 allows direct temperature control of the machine and / or electrical components if the heat transfer fluid in the heat transfer fluid circuit 100 is a dielectric fluid. Alternatively, for example, if the heat transfer fluid in the heat transfer fluid circuit 100 is a mixture of water and antifreeze, a separate temperature control fluid circuit is provided, possibly the same as for the electrical energy storage device.

[0034] It is understood that the various heat exchangers 12, 13, 14, 22, 23 of each of the loops 10, 20 can be active or inactive, that is to say, allow heat exchange or not.It is also understood that the first and second pumps 11, 21 can be active or inactive. The term "active" means that the pump in question is operating, while the term "inactive" means that the pump in question is not operating. An inactive element can be considered as being absent from the circuit.

[0035] The first loop 10 is advantageously configured so that the fluid flows successively, in this order, into 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 Fl of the heat transfer fluid in the first loop 10 (see for example [Fig.2]).

[0036] The second loop 20 is advantageously configured so that the fluid flows successively, in this order, into 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]).

[0037] Advantageously, the first pump 11 of the first loop 10 is unidirectional, meaning that it only allows fluid circulation in one direction of flow. Advantageously, the second pump 21 is reversible, meaning that the second pump 21 allows fluid circulation in a given direction of flow 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.

[0038] The first loop 10 includes, according to the first direction of flow Fl of the fluid, a divergence point 15 located here downstream of the two-fluid exchanger 14 and upstream of the first pump 11 and / or a convergence point 16 located here downstream of the heat exchanger batteries 13 and upstream of the two-fluid exchanger 14.

[0039] The second loop 20 comprises, according to the second direction of fluid flow F2, a first connection point 24 located here downstream of the second pump 21 and in 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.

[0040] 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. Also in this example of [Fig. 1], 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.

[0041] Advantageously, the second branch 40 includes a check valve 50a. This check valve 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, in order to switch from the second flow direction F2 to the third flow direction F3, the second pump 21 is, as already stated, a reversible pump.

[0042] Advantageously, the second loop 20 includes at least one non-return device 50b. This non-return device 50b of the second loop 20 can be located between the radiator 22 and the second connection point along the second flow direction F2 of the fluid in the second loop 20. Advantageously, this non-return device 50b of the second loop 20 is configured to allow the fluid to flow along the second flow direction F2 of the fluid.

[0043] The circuit 100 of [Fig. 1] is advantageously configured so that fluid circulation can take place alternately: - only in the first loop 10 according to the first direction of flow 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 Fl, 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 flowing in a third flow direction F3, opposite to the second flow direction F2, in the second loop 20, and / or - in a 10' portion of the first loop 10 and the 20' portion of the second loop 20, with a fluid passage between the 10' portion of the first loop 10 and portion 20' of second loop 20, the fluid circulating in the third direction of flow F3, opposite to the second direction of flow F2, in second loop 20.

[0044] It is also noted that the circuit 100 includes an expansion vessel, for example located on the first loop 10.

[0045] In what follows, reference is made to Figures 2 to 10, which illustrate different operating modes 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 are shown in bold lines, and the pipes in which the heat transfer fluid is not moving are shown in dashed lines. Similarly, the elements shown in dashed lines are inactive.

[0046] Figure 2 simultaneously illustrates a first and a second operating mode of the circuit 100 according to the invention. In both operating modes, fluid circulation occurs only in the first loop 10 in the first flow direction Fl. It is therefore understood that the second pump 21 of the second loop 20 is inactive. Furthermore, the heat exchangers 22, 23 of the second loop 20 are also inactive since no heat exchange occurs, due to the lack of circulation of the heat transfer fluid in the exchangers concerned. In both operating modes, 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 flow direction Fl through the coil heat exchanger 13 and the dual-fluid heat exchanger 14.

[0047] Thus, in the first operating mode, the heat transfer fluid extracts heat from the electrical energy storage device by means of the battery heat exchanger 13 to cool the electrical energy storage device. This extracted heat is then recovered by the dual-fluid heat exchanger 14, which dissipates it in the refrigerant circuit.

[0048] In the second operating mode, the two-fluid heat exchanger 14 supplies heat to the heat transfer fluid by drawing it from the refrigerant circuit. This heat is recovered by the battery heat exchanger 13 in order to heat the electrical energy storage device.

[0049] Figure 3 illustrates a third operating mode of the circuit 100 according to the invention. In this third operating mode, fluid circulation occurs only in the first loop 10 in the first flow direction FL. As with Figure 2, it is understood that the second pump 21 and the heat exchangers 22, 23 are inactive. In this mode, the two-fluid heat exchanger 14 is inactive due to the absence of refrigerant circulation within said two-fluid heat exchanger. Thus, the first pump 11 circulates the heat transfer fluid. according to the first direction of flow Fl through the electric heating device 12 and the heat exchanger batteries 13. In this way, the electric heating device 12 supplies calories to the heat transfer fluid which delivers them via the heat exchanger batteries 13 to the electrical energy storage device to heat it.

[0050] Figure 4 illustrates a fourth operating mode of the circuit 100 according to the invention. In this fourth operating mode, fluid circulation occurs only in the first loop 10 in the first flow direction Fl. As before, 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 in the first flow direction Fl through the electric heating device 12, the battery heat exchanger 13, and the dual-fluid heat exchanger 14.

[0051] In this way, the heating device 12 supplies heat to the heat transfer fluid circulated by the first pump 11. Part of this heat is transferred to the electrical energy storage device via the battery heat exchanger 13, and another part of this heat is transferred to the refrigerant via the dual-fluid heat exchanger 14. This mode of operation makes it possible, for example, to heat an airflow, referred to as internal air intended for the vehicle's passenger compartment, via the refrigerant circuit. The circulating heat transfer fluid then returns to the first pump 11 to be heated again by the heating device 12.

[0052] Figure 5 illustrates a fifth operating mode of the circuit 100 according to the invention. In this fifth operating mode, the fluid circulates independently in the first loop 10, in the first flow direction Fl, and in the second loop 20, in the second flow direction F2. In the particular case of Figure 5, the second flow direction F2 of the second loop 20 is opposite to the first flow direction Fl 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 in the first flow direction Fl through the heat exchanger coils 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 device 50b and the machine heat exchanger 23.

[0053] It should be noted that a pressure differential between the first loop 10 and the second loop 20 prevents the heat transfer fluid of each of the loops from circulating in the branches 30, 40 connecting the two loops 10, 20.

[0054] Thus, in the first loop 10, the heat transfer fluid extracts heat from the electrical energy storage device by means of the battery heat exchanger 13 to cool the electrical energy storage device. This heat The extracted heat is then recovered by the dual-fluid heat exchanger 14 and dissipated in the refrigerant circuit. Meanwhile, in the second loop 20, the heat transfer fluid extracts heat from the machine via the machine heat exchanger 23. This extracted heat is then recovered by the radiator 22 and dissipated into the external airflow.

[0055] Figure 6 illustrates a sixth operating mode of the circuit 100 according to the invention. In this sixth operating mode, the fluid circulates independently in the first loop 10, in the first flow direction Fl, and in the second loop 20, in the second flow direction F2. As before, 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 Fl through the electric heating device 12, 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 valve 50b, and the machine heat exchanger 23.

[0056] Thus, in the first loop 10, the heating device 12 supplies heat to the heat transfer fluid circulated by the first pump 11. Part of this heat is transferred to the electrical energy storage device via the battery heat exchanger 13, and another part is transferred to the refrigerant 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. Meanwhile, in the second loop 20, the heat transfer fluid extracts heat from the machine via the machine heat exchanger 23, thereby cooling it. This extracted heat is then recovered by the radiator 22 and dissipated into the external airflow.

[0057] Figure 7 illustrates a seventh operating mode of the circuit 100 according to the invention. In this seventh operating mode, the fluid circulates independently in the first loop 10, in the first flow direction Fl, and in the second loop 20, in the second flow direction F2. As before, 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 Fl through the electric heating device 12 and the battery heat exchanger 13, the dual-fluid heat exchanger 14 being inactive as in the third operating mode. In the second loop, the second pump 21 circulates the heat transfer fluid in the second direction of flow F2 through the radiator 22, the non-return device 50b and the heat exchanger machine 23.

[0058] Thus, in the first loop 10, the electric heating device 12 supplies heat to the heat transfer fluid, which delivers it via the battery heat exchanger 13 to the electrical energy storage device to heat it. Meanwhile, in the second loop 20, the heat transfer fluid extracts heat from the machine via the machine heat exchanger 23. This extracted heat is then recovered by the radiator 22 and dissipated into the external airflow.

[0059] Figure 8 illustrates an eighth operating mode of the circuit 100 according to the invention. In this eighth operating mode, fluid circulation occurs in the first loop 10 and a portion 20' of the second loop 20, with fluid passing between the first loop 10 and this portion 20' of the second loop 20. The fluid flows 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 is in the same direction as the first flow direction F1. The portion 20' of the second loop is defined as the portion of the second loop 20 extending between the first connection point 24 and the second connection point 25 and which includes the second pump 21.

[0060] In the specific case of [Fig. 8], in the first loop 10, the electric heating device 12 and the two-fluid heat exchanger 14 are inactive. In the second loop 20, the radiator 22 is inactive because it is not traversed by the heat transfer fluid.

[0061] Thus, at the divergence point 15, part of the heat transfer fluid is driven by the first pump 11 through the heat exchanger battery 13 while the other part 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 and then in the second branch 40 through the non-return device 50a from the connection point 25 to the convergence point 16, to join the first loop 10 and return to the divergence point 15 in the first flow direction Fl, this under the combined action of the first and second pumps 11,21.

[0062] It should 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 valve 50b of the second loop, which allows fluid circulation only in the second flow direction F2.

[0063] Thus, in this eighth operating mode, the heat exchanger machine 23 supplies calories to the heat transfer fluid. These calories are then recovered by the heat exchanger batteries 13 in order to heat the electrical energy storage device.

[0064] Figure 9 illustrates a ninth operating mode of the circuit 100 according to the invention. In this ninth operating mode, as previously for the case of Figure 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.

[0065] In the particular case of [Fig.9], only the radiator 22 is inactive in the second loop 20.

[0066] Thus, in this ninth mode of operation, the electric heating device 12 and / or the battery heat exchanger 13 and / or the machine heat exchanger 23 supply heat to the heat transfer fluid circulated by the first and second pumps 11, 21. This heat is then transferred to the refrigerant via the two-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.

[0067] Figure 10 illustrates a tenth operating mode of the circuit 100 according to the invention. In this tenth operating mode, the circulation of the heat transfer fluid takes place in a portion 10' of the first loop 10 and the previously defined portion 20' of the second loop 20, with fluid passing between portion 10' of the first loop 10 and this portion 20' of the second loop 20. The fluid flows in the third flow direction F3, opposite to the second flow direction F2, in the relevant part of the second loop 20. Portion 10' of the first loop 10 is defined as the portion of the first loop 10 extending from the convergence point 16 to the divergence point 15 and not including the first pump 11.

[0068] In the particular case of [Fig. 10], in the first loop 10, the first pump 11 is inactive, as are the electric heating device 12 and the heat exchanger battery 13. It is understood that the heat transfer fluid does not circulate between the divergence point 15 and the convergence point 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 heat exchanger machine 23 in the portion 20' of the second loop 20, in the second branch 40 through the non-return device 50a from the connection point 25 to the convergence point 16, to through the two-fluid heat exchanger 14 then in the first branch 30 from the divergence point 15 towards the connection point 24.

[0069] Thus, in this tenth mode of operation, the machine heat exchanger 23 supplies calories to the heat transfer fluid circulated by the second pump 21. These calories are then transferred to the refrigerant via the two-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.

[0070] Alternatively, not shown, identical operating modes can be obtained by reversing both the flow directions Fl, F2, F3 and both the non-return devices 50a, 50b.

[0071] The invention also relates to a thermal management system for a hybrid or electric vehicle comprising a heat transfer fluid circuit as described above and, in particular, the thermoregulation fluid circuit(s) and / or the refrigerant fluid circuit mentioned above.

Claims

1. Demands 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) to each other 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 devices (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), the circuit (100) being configured so that a circulation of the fluid can take place alternately:, - only in the first loop (10) according to a first direction of flow (Fl), - only in the second loop (20) according to a 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 and said portion (20') of the second loop, the fluid flowing in a third direction of flow (F3), opposite to the second direction of flow (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 flowing in the third direction flow direction (F3), opposite to the second flow direction (F2), in the second loop, characterized in that the second loop (20) is configured so that the fluid flows successively, in that order, into the second pump (21), a radiator (22) and a heat exchanger (23), said machine, according to the second flow direction (F2) of the fluid in said second loop (20).

2. Circuit (100) according to claim 1, wherein the first loop (10) is configured so that the fluid flows successively, in this order, into the first pump (11), an electric heating device (12), a heat exchanger (13), said batteries, and a two-fluid heat exchanger (14) according to the first direction of flow (Fl) of the fluid in said first loop (10).

3. Circuit (100) according to claim 2, wherein the first loop (10) comprises, according to said first direction of flow (Fl) of the fluid, a divergence point (15) located downstream of the two-fluid exchanger (14) and upstream of the first pump (11), and a convergence point (16) located downstream of the heat exchanger batteries (13) and upstream of the two-fluid exchanger (14).

4. Circuit (100) according to claim 1, wherein 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).

5. Circuit (100) according to the combination of claims 3 and 4, 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).

6. Circuit (100) according to any one of claims 1 to 5, wherein the second loop (20) comprises at least one first of the check valves (50b).

7. Circuit (100) according to claim 5, wherein the second branch (40) comprises a second of the non-return devices (50a).

8. Thermal management system of a hybrid or electric vehicle comprising a heat transfer fluid circuit (100) according to any one of claims 1 to 7.

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