Battery thermal management system for electric or hybrid vehicles

Abstract

Thermal management system for an electric or hybrid motor vehicle comprising a heat transfer fluid circuit and a refrigerant fluid circuit (X), the heat transfer fluid circuit comprising: - a first loop (A) including a first pump (3), the combined heat exchanger (4) and a first heat exchanger thermally coupled to an airflow (5), - a second loop (B) including a second pump (6), the first dual-fluid heat exchanger (8) and a heat exchanger thermally coupled to the batteries (7), - a third loop (C) including a third pump (11), the second dual-fluid heat exchanger (12) and a second heat exchanger thermally coupled to an airflow (13), and - five branch lines (21, 22, 23, 24, 25). Abbreviated figure: Fig 6

Description

Title of the invention: Battery thermal management device for electric or hybrid vehicles

[0001] The invention relates to the field of electric and hybrid motor vehicles and more particularly to a thermal management device for the passenger compartment and batteries of such a motor vehicle.

[0002] Current electric and hybrid vehicles increasingly incorporate thermal management systems for both the batteries and the passenger compartment. Indeed, for the batteries to operate at maximum efficiency, they must maintain an optimal operating temperature. Therefore, it is necessary to cool them during use to prevent them from excessively exceeding this optimal operating temperature. Similarly, it may also be necessary to heat them, for example in cold weather, so that the batteries reach this optimal operating temperature as quickly as possible. It is also important to be able to heat or cool the passenger compartment to ensure the comfort of its occupants.

[0003] It is known that for efficient thermal management of batteries and the passenger compartment, dedicated thermal management circuits with interconnections are used to transfer heat or cold. A heat transfer fluid, such as water or glycol water, circulates within these thermal management circuits. These thermal management circuits are generally associated with a refrigerant circuit comprising a first cooler dedicated to the batteries and a second cooler dedicated to the passenger compartment. Furthermore, in cases where the refrigerant is flammable, such as R290, current regulations mandate a specific volume of this refrigerant, as well as the shortest possible pipe and circulation routes to minimize pressure losses.The complexity of the thermal management system's architecture is thus transferred to the heat transfer fluid circuit in order to enable the various usual operating modes.

[0004] For operating modes in which, for example, the batteries are being rapidly charged, the cooling demand is significant and requires a corresponding cooling capacity. This, in turn, impacts the architecture of the heat transfer fluid circuit, which must enable this cooling.

[0005] 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 management device, in particular for cooling batteries during fast charging.

[0006] The present invention relates to a thermal management device for an electric or hybrid motor vehicle comprising a heat transfer fluid circuit and a refrigerant circuit in which a refrigerant is intended to circulate, said refrigerant circuit comprising, in the direction of refrigerant circulation, a compressor, a combined heat exchanger arranged jointly on the heat transfer fluid circuit, a first dual-fluid heat exchanger arranged jointly on the heat transfer fluid circuit, the refrigerant circuit comprising a first expansion device located upstream of the first two-fluid heat exchanger, the refrigerant circuit further comprising a branch connected in parallel to the first two-fluid heat exchanger and the first expansion device, said branch comprising a second two-fluid heat exchanger, jointly arranged on the heat transfer fluid circuit, and a second expansion device arranged upstream of the second two-fluid heat exchanger, the heat transfer fluid circuit comprising: - a first loop comprising a first pump, the combined heat exchanger and a first heat exchanger thermally coupled to an airflow, - a second loop comprising a second pump, the first bi-fluid heat exchanger and a heat exchanger thermally coupled to the batteries, - a third loop comprising a third pump, the second bi-fluid heat exchanger and a second heat exchanger thermally coupled to an airflow, - a first bypass pipe connecting the heat transfer fluid outlet of the heat exchanger thermally coupled with the coils to the heat transfer fluid inlet of the second two-fluid heat exchanger, - a second bypass pipe connecting the heat transfer fluid outlet of the second two-fluid heat exchanger to the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries, - a first heat transfer fluid redirection device configured to redirect the heat transfer fluid at the outlet of the second two-fluid heat exchanger towards the second bypass pipe or towards the heat transfer fluid inlet of the second heat exchanger thermally coupled to an airflow, - a third bypass pipe connecting the heat transfer fluid outlet of the combined heat exchanger to the heat transfer fluid inlet of the heated combined heat exchanger, said third bypass pipe comprising a radiator, - a second redirection device configured to redirect the heat transfer fluid at the outlet of the combined heating heat exchanger towards the first heat exchanger thermally coupled to an airflow or towards the third bypass pipe, - a fourth bypass pipe connecting the heat transfer fluid outlet of the radiator to the heat transfer fluid inlet of the second two-fluid heat exchanger, - a fifth bypass pipe connecting the heat transfer fluid outlet of the second two-fluid heat exchanger to the heat transfer fluid inlet of the radiator, - a third redirection device configured to redirect the heat transfer fluid at the outlet of the second two-fluid heat exchanger, passing through the second bypass pipe, to the second loop or to the fifth bypass pipe.

[0007] According to one aspect of the invention, the thermal management device is configured to operate in a first operating mode in which: The refrigerant circuit is operating such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in both the first and second dual-fluid heat exchangers. Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the radiator via the third bypass pipe, The heat transfer fluid, set in motion by the second pump, circulates between the first dual-fluid heat exchanger and the heat exchanger thermally coupled to the batteries. At the outlet of the heat exchanger thermally coupled with the batteries, part of the heat transfer fluid joins the first two-fluid heat exchanger and another part of the heat transfer fluid passes through the first bypass pipe to join the third loop and pass through the second two-fluid heat exchanger; at the outlet of the second two-fluid heat exchanger, the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries via the second bypass pipe.

[0008] According to another aspect of the invention, the second loop includes an electric heating element for the heat transfer fluid arranged upstream of the first two-fluid heat exchanger.

[0009] According to another aspect of the invention, the thermal management device is configured to operate in a second operating mode in which: the refrigerant circuit is stopped, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump circulates in the second loop between the electric heating element which is in operation, the first two-fluid heat exchanger and the heat exchanger thermally coupled with the batteries.

[0010] According to another aspect of the invention, the heat transfer fluid circuit comprises: - a sixth bypass line for the heat exchanger thermally coupled with the batteries, connecting the heat transfer fluid inlet of said heat exchanger thermally coupled with the batteries to its heat transfer fluid outlet on the second loop, - a fourth redirection device configured to redirect the heat transfer fluid arriving at the heat exchanger thermally coupled with the batteries to the sixth bypass line or to the heat exchanger thermally coupled with the batteries.

[0011] According to another aspect of the invention, the thermal management device is configured to operate in a third operating mode in which: The refrigerant circuit is in operation such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in the first dual-fluid heat exchanger. Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the first heat exchanger thermally coupled to an airflow, The heat transfer fluid set in motion by the second pump circulates between the electric heating element which is in operation, the first two-fluid heat exchanger and the sixth bypass pipe.

[0012] According to another aspect of the invention, the heat transfer fluid circuit comprises: - a seventh bypass pipe connecting the heat transfer fluid outlet of the radiator to the heat transfer fluid inlet of the radiator, said seventh bypass pipe comprising a heat exchanger with the electrical power chain of the motor vehicle, - an eighth bypass pipe connecting the heat transfer fluid outlet of the heat exchanger with the electrical power chain at the heat transfer fluid inlet of the first two-fluid heat exchanger, - a fifth redirection device configured to redirect the heat transfer fluid exiting the heat exchanger with the electrical power chain towards the radiator or towards the eighth bypass pipe, - a ninth bypass line connecting the heat transfer fluid outlet of the thermally coupled heat exchanger with the batteries or the sixth bypass line to the heat transfer fluid inlet of the heat exchanger with the electrical power chain, the seventh bypass pipe further comprising a fourth pump arranged upstream or downstream of the heat exchanger with the electrical power chain between the eighth and ninth bypass pipes.

[0013] According to another aspect of the invention, the thermal management device is configured to operate in a fourth operating mode in which: The refrigerant circuit is operating such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in both the first and second dual-fluid heat exchangers. Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump circulates between the first dual-fluid heat exchanger and the heat exchanger thermally coupled to the coils, The heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the radiator via the third bypass pipe, and The heat transfer fluid set in motion by the fourth pump also circulates within the seventh bypass pipe, between the heat exchanger with the electrical power chain and the radiator.

[0014] According to another aspect of the invention, the thermal management device is configured to operate in a fifth operating mode in which: The refrigerant circuit is operating such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in both the first and second dual-fluid heat exchangers. Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the radiator via the third bypass pipe, The heat transfer fluid, set in motion by the second pump, circulates between the first dual-fluid heat exchanger and the heat exchanger thermally coupled to the batteries. At the outlet of the heat exchanger thermally coupled with the batteries, part of the heat transfer fluid joins the first two-fluid heat exchanger and another part of the heat transfer fluid passes through the first bypass pipe to join the third loop and pass through the second two-fluid heat exchanger; at the outlet of the second two-fluid heat exchanger, the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries via the second bypass pipe. The heat transfer fluid set in motion by the fourth pump also circulates within the seventh bypass pipe, between the heat exchanger with the electrical power chain and the radiator.

[0015] According to another aspect of the invention, the thermal management device is configured to operate in a sixth operating mode in which: the refrigerant circuit is in operation such that high-pressure refrigerant circulates in the joint heat exchanger and low-pressure refrigerant circulates in the first two-fluid heat exchanger, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the joint heat exchanger and the first heat exchanger thermally coupled to an airflow, the heat transfer fluid set in motion by the fourth pump circulates between the heat exchanger with the electrical power chain, the eighth bypass line, the first two-fluid heat exchanger, the sixth bypass line and the ninth bypass line.

[0016] According to another aspect of the invention, the thermal management device is configured to operate in a seventh operating mode in which: the refrigerant circuit is in operation such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in the first dual-fluid heat exchanger; within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the first heat exchanger thermally coupled to an airflow; the heat transfer fluid set in motion by the second pump circulates between the first dual-fluid heat exchanger and the heat exchanger thermally coupled to the batteries; at the outlet of the heat exchanger thermally coupled to the batteries,Part of the heat transfer fluid enters the first two-fluid heat exchanger, and another part of the heat transfer fluid passes through the ninth bypass pipe to cross the heat exchanger with the electrical power chain. At the outlet of the heat exchanger with the electrical power chain, the heat transfer fluid returns to the heat transfer fluid inlet of the first two-fluid heat exchanger via the eighth bypass pipe.

[0017] According to another aspect of the invention, the electric heating element of the heat transfer fluid is in operation.

[0018] According to another aspect of the invention, the thermal management device is configured to operate in an eighth operating mode in which: the refrigerant circuit is stopped; within the heat transfer fluid circuit, the heat transfer fluid set in motion by the fourth pump circulates in the heat exchanger with the electrical power chain and joins the heat transfer fluid inlet of the first heat exchanger. via the eighth bypass pipe, the heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries and, At the outlet of the heat exchanger thermally coupled with the batteries, the heat transfer fluid passes through the ninth bypass pipe to join the heat exchanger with the electrical power chain.

[0019] According to another aspect of the invention, the Thermal Management Device is configured to operate in a ninth operating mode in which: The refrigerant circuit is operating such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in both the first and second dual-fluid heat exchangers. Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump circulates between the combined heat exchanger and the first heat exchanger thermally coupled to an airflow, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the fourth pump circulates in the heat exchanger with the electrical power chain and joins the heat transfer fluid inlet of the first two-fluid heat exchanger via the eighth bypass pipe; the heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries, At the outlet of the heat exchanger thermally coupled with the batteries, the heat transfer fluid passes through the ninth bypass pipe to join the heat exchanger with the electrical power chain, The heat transfer fluid set in motion by the third pump also circulates between the second two-fluid heat exchanger, the fifth bypass pipe, the radiator and the fourth bypass pipe.

[0020] According to another aspect of the invention, the thermal management device is configured to operate in a tenth operating mode in which: The refrigerant circuit is in operation such that high-pressure refrigerant circulates in the combined heat exchanger and low-pressure refrigerant circulates in the second dual-fluid heat exchanger; the heat transfer fluid, set in motion by the first pump, circulates between the combined heat exchanger and the first heat exchanger thermally coupled to an airflow. The heat transfer fluid, set in motion by the third pump, circulates between the second dual-fluid heat exchanger and the second heat exchanger thermally coupled to an airflow. The heat transfer fluid set in motion by the fourth pump also circulates within the seventh bypass pipe, between the heat exchanger with the electrical power chain and the radiator.

[0021] According to another aspect of the invention, the thermal management device is configured to operate in a twelfth operating mode in which: The refrigerant circuit is in operation such that high-pressure refrigerant circulates in the combined heat exchanger and refrigerant circulates in the first and second dual-fluid heat exchangers. within the heat transfer fluid circuit, the heat transfer fluid is set in motion by The first pump circulates between the combined heat exchanger and the radiator via the third bypass pipe. The heat transfer fluid set in motion by the fourth pump also circulates within the seventh bypass pipe between the heat exchanger with the electrical power chain and the radiator, The heat transfer fluid set in motion by the second pump also circulates between the electric heating element and the operating heat transfer fluid; the heat transfer fluid then rises up the eighth bypass pipe to join the seventh bypass pipe and the radiator. At the outlet of the radiator, part of the heat transfer fluid joins the fourth bypass pipe in order to then go up the first bypass pipe to join the second loop.

[0022] Other features and advantages of the present invention will become more apparent upon reading the following description, provided by way of illustration and not limitation, and the accompanying drawings in which:

[0023] [Fig-1] Fig. 1 is a schematic representation of a fluid circuit refrigerant of a thermal management device,

[0024] [Fig.2] Fig.2 is a schematic representation of a fluid circuit heat transfer fluid according to a first embodiment of a thermal management device,

[0025] [Fig.3] [Fig.3] is a schematic representation of the fluid circuit device heat transfer fluid of [Fig.2] according to a first operating mode,

[0026] [Fig.4] Fig.4 is a schematic representation of the heat transfer fluid circuit device of Fig.2 according to a second operating mode,

[0027] [Fig.5] Fig.5 is a schematic representation of the heat transfer fluid circuit device of Fig.2 according to a third operating mode,

[0028] [Fig.6] Fig.6 is a schematic representation of a heat transfer fluid circuit according to a second embodiment of a thermal management device,

[0029] [Fig.7] Fig.7 is a schematic representation of the heat transfer fluid circuit device of Fig.6 according to a fourth operating mode,

[0030] [Fig.8] Fig.8 is a schematic representation of the heat transfer fluid circuit device of Fig.6 according to a fifth operating mode,

[0031] [Fig.9] Fig.9 is a schematic representation of the heat transfer fluid circuit device of Fig.6 according to a sixth operating mode,

[0032] [Fig. 10] [Fig. 10] is a schematic representation of the heat transfer fluid circuit device of [Fig. 6] according to a seventh operating mode,

[0033] [Fig 11 Figure 11 is a schematic representation of the heat transfer fluid circuit device of Figure 6 according to an eighth operating mode,

[0034] [Fig. 12] [Fig. 12] is a schematic representation of the heat transfer fluid circuit device of [Fig. 6] according to a ninth operating mode,

[0035] [Fig. 13] [Fig. 13] is a schematic representation of the heat transfer fluid circuit device of [Fig. 6] according to a tenth operating mode,

[0036] [Fig. 14] [Fig. 14] is a schematic representation of the heat transfer fluid circuit device of [Fig. 6] according to an eleventh operating mode,

[0037] [Fig. 15] The [Fig. 15] is a schematic representation of the heat transfer fluid circuit device of the [Fig.6] according to a twelfth mode of operation.

[0038] In the different figures, the identical elements bear the same reference numbers.

[0039] The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined and / or interchanged to provide other embodiments.

[0040] In this description, certain elements or parameters can be indexed, such as first element or second element, first parameter and second parameter, first criterion and second criterion, etc. In this case, it is simply a matter of indexing to differentiate and name similar but not identical elements, parameters, or criteria. This indexing does not imply any priority of one element, parameter, or criterion over another, and such designations can easily be interchanged without departing from the scope of this description. Nor does this indexing imply any order in time, for example, for evaluating one criterion or another.

[0041] In this description, "placed upstream" means that an element is placed before another with respect to the direction of fluid flow. Conversely, "Placed downstream" means that an element is placed after another with respect to the direction of fluid flow.

[0042] The thermal management device for an electric or hybrid motor vehicle according to the invention comprises a heat transfer fluid circuit (visible in Figures 2 to 15) and a refrigerant fluid circuit X (visible in [Fig. 1]) in which a refrigerant fluid is intended to circulate. The refrigerant fluid circuit X may, in particular, contain a potentially flammable fluid such as R290 as the refrigerant.

[0043] As illustrated in [Fig. 1], the refrigerant circuit X includes, in the direction of refrigerant flow, a compressor 101, a combined heat exchanger 4 located on the heat transfer fluid circuit 1, and a first dual-fluid heat exchanger 8 located on the heat transfer fluid circuit. This combined heat exchanger 4 may, in particular, be a condenser. The refrigerant circuit X also includes a first expansion device 102 located upstream of the first dual-fluid heat exchanger 8. More specifically, the first expansion device 102 is located upstream of the first dual-fluid heat exchanger 8 and downstream of the combined heat exchanger 4.

[0044] The refrigerant circuit X may also include a branch X' connected in parallel to the first two-fluid heat exchanger 8 and the first expansion device 102. This branch X' includes a second two-fluid heat exchanger 12 also jointly arranged on the heat transfer fluid circuit and a second expansion device 103 arranged upstream of the second two-fluid heat exchanger 12. More specifically, the branch X' connects a first connection point XI to a second connection point X2. The first connection point XI is arranged upstream of the first expansion device 102, between the joint heat exchanger 4 and the first expansion device 102. The second connection point X2 is arranged downstream of the first heat exchanger 8, between the first heat exchanger 8 and the compressor 101.

[0045] As illustrated in [Fig.2], the heat transfer fluid circuit comprises a first loop A, a second loop B and a third loop C (shown in thick lines) interconnected by means of several branch lines 21, 22, 23, 24, 25 (shown in thin lines).

[0046] The first loop A more particularly comprises a first pump 3, the combined heat exchanger 4, and a first heat exchanger thermally coupled to an airflow 5. The first pump 3 may, in particular, be located downstream or upstream of the combined heat exchanger 4. This first heat exchanger thermally coupled to an airflow 5 may, in particular, be located in a Heating, ventilation, and air conditioning system for the passenger compartment of the motor vehicle. This first heat exchanger, thermally coupled to an airflow 5, can thus be configured to carry an airflow destined for the passenger compartment. Alternatively, this first heat exchanger, thermally coupled to an airflow 5, can be indirectly coupled to this airflow by means of another heat exchange loop.

[0047] The second loop B comprises a second pump 6, the first two-fluid heat exchanger 8, and a heat exchanger thermally coupled to the coils 7. A heat exchanger thermally coupled to the coils 7 is defined as a heat exchanger configured to allow direct or indirect heat exchange with the coils in order to regulate their temperature. The second pump 6 can, in particular, be located upstream or downstream of the first two-fluid heat exchanger 8.

[0048] The third loop C comprises a third pump 11, a second two-fluid heat exchanger 12, and a second heat exchanger thermally coupled to an airflow 13. The third pump 11 can, in particular, be located upstream or downstream of the second two-fluid heat exchanger 12. This second heat exchanger thermally coupled to an airflow 13 can, in particular, be located in a heating, ventilation, and air conditioning system for the passenger compartment of the motor vehicle, similar to the first heat exchanger thermally coupled to an airflow 5. This second heat exchanger thermally coupled to an airflow 13 can thus be configured to carry an airflow destined for the passenger compartment. Advantageously, the second heat exchanger thermally coupled to an airflow 13 is located upstream of the first heat exchanger thermally coupled to an airflow 5 in the direction of the airflow passing through them.According to an alternative, this second heat exchanger thermally coupled to an airflow 13 can be indirectly coupled to this airflow by means of another heat exchange loop.

[0049] The first bypass line 21 connects the heat transfer fluid outlet of the heat exchanger thermally coupled with the batteries 7 to the heat transfer fluid inlet of the second two-fluid heat exchanger 12.

[0050] In the example illustrated in [Fig. 2], this first branch line 21 connects, more specifically, a first connection point 21a to a second connection point 21b. The first connection point 21a is located on the second loop B downstream of the heat exchanger thermally coupled to the coils 7, between the heat exchanger thermally coupled to the coils 7 and the first two-fluid heat exchanger 8. The second connection point 21b is located on the third loop C upstream of the second heat exchanger. bifluid 12, between the second heat exchanger thermally coupled to an airflow 13 and the second bifluid heat exchanger 12.

[0051] The second bypass line 22 connects the heat transfer fluid outlet of the second two-fluid heat exchanger 12 to the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries 7.

[0052] In the example illustrated in [Fig.2], this second bypass pipe 22 more specifically connects a first connection point 22a to a second connection point 22b. The first connection point 22a is located on the third loop C downstream of the second two-fluid heat exchanger 12, between the second two-fluid heat exchanger 12 and the second heat exchanger thermally coupled to an airflow 13. The second connection point 22b is located on the second loop B upstream of the heat exchanger thermally coupled to the coils 7, between the first two-fluid heat exchanger 8 and the heat exchanger thermally coupled to the coils 7.

[0053] The second pump 6 is more particularly disposed downstream or upstream of the first two-fluid heat exchanger 8, between the first connection point 21a of the first branch line 21 and the second connection point 22b of the second branch line 22.

[0054] The second pump 11 is located downstream or upstream of the second two-fluid heat exchanger 12, between the second connection point 21b of the first branch line 21 and the first connection point of the second branch line 22.

[0055] The heat transfer fluid circuit also includes a first heat transfer fluid redirection device 41 configured to redirect the heat transfer fluid from the outlet of the second two-fluid heat exchanger 12 to the second bypass line 22 or to the heat transfer fluid inlet of the second heat exchanger thermally coupled to an airflow 13. In the example illustrated in [Fig. 2], this first redirection device 41 is a three-way valve located at the first connection point 22a of the second bypass line 22. This first redirection device 41 can also be a set of shut-off valves and / or check valves or other known means of controlling the fluid flow.

[0056] The heat transfer fluid circuit further includes a third bypass line 23 connecting the heat transfer fluid outlet of the combined heat exchanger 4 to the heat transfer fluid inlet of the combined heat exchanger. This third bypass line 23 includes, in particular, a radiator 10. This radiator 10 may, in particular, be subject to an airflow external to the motor vehicle, for example, at the front. Located upstream of the radiator 10, the third bypass line 23 may also include an expansion vessel 9.

[0057] In the example illustrated in [Fig. 2], the third branch line 23 connects a first connection point 23a to a second connection point 23b. The first connection point 23a is located on the first loop A downstream of the combined heat exchanger 4, more precisely between the combined heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5. The second connection point 23b is located on the first loop A upstream of the combined heat exchanger 4, more precisely between the first heat exchanger thermally coupled to an airflow 5 and the combined heat exchanger 4. The first pump 3 is located on the first loop A between the second connection point 23a and the first connection point 23, either upstream or downstream of the combined heat exchanger 4.

[0058] The heat transfer fluid circuit may also include a second redirection device 42 configured to redirect the heat transfer fluid at the outlet of the joint heat exchanger 4 to the first heat exchanger thermally coupled to an airflow 5 or to the third bypass line 23. In the example illustrated in [Fig. 2], this second redirection device 42 is a three-way valve located at the first connection point 23a of the third bypass line 23. This second redirection device 42 may also be a set of shut-off valves and / or check valves or other known means of controlling the fluid flow.

[0059] The heat transfer fluid circuit also includes a fourth bypass pipe 24 connecting the heat transfer fluid outlet of the radiator 10 to the second two-fluid heat exchanger 12.

[0060] In the example illustrated in [Fig. 2], this fourth branch line 24 connects a first connection point 24a to a second connection point 24b. The first connection point 24a is located on the third branch line 23, downstream of the radiator 10. The second connection point 24b is located on the third loop C upstream of the second two-fluid heat exchanger 12, between the second heat exchanger thermally coupled to an airflow 13 and the second two-fluid heat exchanger 12. More specifically, the second connection point 24b is located upstream of the second connection point 21b of the first branch line 21.

[0061] The heat transfer fluid circuit also includes a fifth bypass line 25 connecting the heat transfer fluid outlet of the second two-fluid heat exchanger 12 to the heat transfer fluid inlet of the radiator 10.

[0062] In the example illustrated in [Fig. 2], this fifth branch pipe 25 connects a first connection point 25a to a second connection point 25b. The first connection point 25a is located on the second branch pipe. 22. The second connection point 25b is located on the third branch pipe 23, upstream of the radiator 10.

[0063] The heat transfer fluid circuit further includes a third redirection device 43 configured to redirect the heat transfer fluid at the outlet of the second two-fluid heat exchanger 12, passing through the second bypass pipe 22, to the second loop B or to the fifth bypass pipe 25. In the example illustrated in [Fig. 2] this third redirection device 43 is a three-way valve located at the first connection point 25a of the fifth bypass pipe 25. This third redirection device 43 can also be a set of shut-off valves and / or check valves or other known means of controlling the fluid flow.

[0064] As illustrated in [Fig.2], the second loop B may also include an electric heating element 16 for the heat transfer fluid arranged upstream of the first two-fluid heat exchanger 8. In the example illustrated in [Fig.2], this electric heating element 16 is arranged between the first connection point 21a of the first branch line 21 and the first two-fluid heat exchanger 8. The electric heating element 16 may, in particular, be a high-voltage resistor.

[0065] The thermal management device is thus configured to operate according to several operating modes illustrated in Figures 3 to 15 with regard to the heat transfer fluid circuit. In these figures, the elements in which the heat transfer fluid does not circulate or are not functional are represented by dashed lines.

[0066] First mode of operation:

[0067] The thermal management device can be configured to operate according to a first operating mode illustrated in [Fig.3].

[0068] In this first mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in both the first 8 and the second 12 bi-fluid heat exchanger.

[0069] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates on the one hand between the joint heat exchanger 4 and the radiator 10 via the third bypass pipe 23.

[0070] The heat transfer fluid set in motion by the second pump 6 circulates on the other hand between the first two-fluid heat exchanger 8 and the heat exchanger thermally coupled with the batteries 7.

[0071] At the outlet of the heat exchanger thermally coupled with the batteries 7, part of the heat transfer fluid joins the first two-fluid heat exchanger 8 and another part of the heat transfer fluid passes through the first bypass pipe 21 to join the third loop C and pass through the second two-fluid heat exchanger 12.

[0072] At the outlet of the second two-fluid heat exchanger 12, the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries 7 via the second bypass pipe 22.

[0073] The heat transfer fluid thus circulates in parallel in the first 8 and the second 12 bifluid heat exchangers. As it passes through these two bifluid heat exchangers 8 and 12, the heat transfer fluid transfers heat energy to the refrigerant of the refrigerant circuit X and is cooled. As it passes through the heat exchanger thermally coupled to the coils 7, the heat transfer fluid recovers heat energy by cooling the coils.

[0074] As it passes through the combined heat exchanger 4, the heat transfer fluid recovers the heat energy from the refrigerant that the refrigerant in the refrigerant circuit X has recovered via the first 8 and second 12 dual-fluid heat exchangers. The heat transfer fluid then releases this heat energy via the radiator 10, for example into the external airflow.

[0075] The fact that the two bifluid heat exchangers 8, 12 are used in parallel increases the thermal cooling capacity. The batteries are then actively cooled with an increased thermal capacity, for example to meet the cooling requirements associated with rapid battery charging.

[0076] In the case where the second loop B includes an electric heating element 16, in this mode of operation, the latter is at rest and is passively traversed by the heat transfer fluid.

[0077] Second mode of operation:

[0078] The thermal management device can be configured to operate according to a second operating mode illustrated in [Fig.4].

[0079] In this second operating mode, the refrigerant fluid circuit X is at a standstill.

[0080] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump 6 circulates in the second loop B between the electric heating element 16 which is in operation, the first bi-fluid heat exchanger 8 and the heat exchanger thermally coupled with the batteries 7.

[0081] The heat transfer fluid is thus heated by the electric heating element 6 and heats the batteries by passing through the heat exchanger thermally coupled with the batteries 7. As the refrigerant fluid circuit X is at rest, the heat transfer fluid passes passively, without heat exchange, through the first two-fluid heat exchanger 8.

[0082] Returning to [Fig.2], the heat transfer fluid circuit may also include a sixth bypass line 26 of the heat exchanger thermally coupled with the batteries 7 connecting the heat transfer fluid inlet of said heat exchanger thermally coupled with the batteries 7 to its heat transfer fluid outlet on the second loop B.

[0083] In the example illustrated in [Fig. 2], this sixth branch line 23 connects, more specifically, a first connection point 26a to a second connection point 26b. The first connection point 26a is located on the second loop B upstream of the heat exchanger thermally coupled with the coils 7, more precisely between the first bifluid heat exchanger 8 and the second connection point 22b of the second connecting line 22. The second connection point 26b is also located on the second loop B, downstream of the heat exchanger thermally coupled with the coils 7, more precisely between the heat exchanger thermally coupled with the coils 7 and the first bifluid heat exchanger 8.The second pump 6 is then positioned downstream or upstream of the first two-fluid heat exchanger 8 between the first connection point 21a of the first branch line 21 and the first connection point 26a of the sixth branch line 23.

[0084] The heat transfer fluid circuit may also include a fourth redirection device 44 configured to redirect the heat transfer fluid arriving at the heat exchanger thermally coupled with the coils 7, to the sixth bypass line 26 or to the heat exchanger thermally coupled with the coils 7. In the example illustrated in [Fig. 2] this fourth redirection device 44 is a three-way valve located at the first connection point 26a of the sixth bypass line 26. This fourth redirection device 44 may also be a set of shut-off valves and / or check valves or other known means of controlling the fluid flow.

[0085] The presence of this sixth bypass pipe 23 and this fourth redirection device 44 allows other modes of operation such as in particular the following third mode of operation.

[0086] Third mode of operation:

[0087] The thermal management device can be configured to operate according to a third operating mode illustrated in [Fig.5].

[0088] In this third mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in the first bi-fluid heat exchanger 8.

[0089] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates on the one hand between the joint heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5.

[0090] The heat transfer fluid set in motion by the second pump 6 circulates on the other hand between the electric heating element 16 which is in operation, the first two-fluid heat exchanger 8 and the sixth bypass pipe 26.

[0091] The heat transfer fluid is thus heated by the electric heating element 6 and this heat energy is transferred to the refrigerant of the refrigerant circuit X by passing through the first two-fluid heat exchanger 8.

[0092] As it passes through the combined heat exchanger 4, the heat transfer fluid recovers this heat energy. As it passes through the first air exchanger 5, the heat transfer fluid releases this heat energy, for example, to the internal airflow to heat the passenger compartment.

[0093] As illustrated in [Fig. 6], the heat transfer fluid circuit may also include a seventh bypass line 27 connecting the heat transfer fluid outlet of the radiator 10 to the heat transfer fluid inlet of the radiator 10. This seventh bypass line 27 includes a heat exchanger with the electric power chain 15 of the motor vehicle as well as a fourth pump 14. The electric power chain may include, in particular, elements such as the powertrain and the internal charger.

[0094] In the example illustrated in [Fig. 6], this seventh branch pipe 27 connects a first connection point 27a to a second connection point 27b. The first connection point 27a is located on the fourth branch pipe 24. The second connection point 27b is located on the fifth branch pipe 25.

[0095] The heat transfer fluid circuit may also include an eighth bypass line 28 connecting the heat transfer fluid outlet of the heat exchanger with the electrical power chain 15 to the heat transfer fluid inlet of the first two-fluid heat exchanger 8.

[0096] In the example illustrated in [Fig. 6], this eighth branch line 28 connects a first connection point 28a to a second connection point 28b. The first connection point 28a is located on the seventh branch line 27 downstream of the heat exchanger with the electrical power chain 15. The second connection point 28b is located on the second loop B upstream of the first two-fluid heat exchanger 8, more precisely between the heat exchanger thermally coupled to the batteries 7 and the first two-fluid heat exchanger 8, preferably downstream of the first connection point 21a of the first branch line 21. More specifically, in the case where the second loop B includes an electric heating element 16, the second connection point 28b of the eighth branch line 28 is disposed between the electric heating element 16 and the first two-fluid heat exchanger 8.

[0097] The second pump 6 is then preferably located upstream of the second connection point 28b of the eighth branch line 28.

[0098] The heat transfer fluid circuit may also include a fifth redirection device 45 configured to redirect the heat transfer fluid exiting the heat exchanger with the electrical power chain 15 to the radiator 10 or to the eighth bypass line 28. In the example illustrated in [Fig. 6], this fifth redirection device 45 is a three-way valve located at the first connection point 28a of the eighth bypass line 28. This fifth redirection device 45 may also be a set of shut-off valves and / or check valves or other known means of controlling the fluid flow.

[0099] The heat transfer fluid circuit may also include a ninth bypass line 29 connecting the heat transfer fluid outlet of the heat exchanger thermally coupled with the batteries 7 or the sixth bypass line 26 to the heat transfer fluid inlet of the heat exchanger with the electrical power chain 15.

[0100] In the example illustrated in [Fig. 6], this ninth branch line 29 connects a first connection point 29a to a second connection point 29b. The first connection point 29a is located on the first connection line 21. The second connection point 29b is located on the seventh branch line 27 upstream of the heat exchanger with the electrical power chain 15.

[0101] The fourth pump 14 is in particular disposed on the seventh bypass pipe 27 upstream or downstream of the heat exchanger with the electrical power chain 15, between the eighth 28 and the ninth 29 bypass pipe. More specifically, the fourth pump 14 is arranged between the second connection point 29b of the ninth branch line 29 and the first connection point 28a of the eighth branch line 28.

[0102] Fourth mode of operation:

[0103] The thermal management device can be configured to operate according to a fourth operating mode illustrated in [Fig.7].

[0104] In this fourth mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in both the first 8 and the second 12 bi-fluid heat exchanger.

[0105] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump 6 circulates between the first bi-fluid heat exchanger 8 and the heat exchanger thermally coupled with the batteries 7.

[0106] The heat transfer fluid set in motion by the first pump 3 circulates between the joint heat exchanger 4 and the radiator 10 via the third bypass pipe 23.

[0107] The heat transfer fluid set in motion by the fourth pump 14 also circulates within the seventh bypass pipe 27 between the heat exchanger with the electrical power chain 15 and the radiator 10.

[0108] As it passes through the heat exchanger thermally coupled to the batteries 7, the heat transfer fluid recovers heat energy by cooling the batteries. The heat transfer fluid then transfers this heat energy to the refrigerant of the refrigerant circuit X as it passes through the first two-fluid heat exchanger 8.

[0109] By passing through the second heat exchanger thermally coupled to an airflow 13, the heat transfer fluid recovers heat energy, for example by cooling an internal airflow to cool the passenger compartment. The heat transfer fluid then transfers this heat energy to the refrigerant of the refrigerant circuit X by passing through the second two-fluid heat exchanger 12.

[0110] As it passes through the combined heat exchanger 4, the heat transfer fluid recovers the heat energy from the refrigerant that the refrigerant in the refrigerant circuit X has recovered via the first 8 and second 12 two-fluid heat exchangers. The heat transfer fluid then releases this heat energy via the radiator 10, for example into the external airflow.

[0111] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then rejoins the heat transfer fluid from the combined heat exchanger 4 to subsequently release this heat energy via the radiator 10.

[0112] This fourth operating mode thus allows active cooling in parallel of the batteries, the passenger compartment and the electrical power chain.

[0113] In the case where the second loop B includes an electric heating element 16, in this mode of operation, the latter is at rest and is passively traversed by the heat transfer fluid.

[0114] Fifth mode of operation:

[0115] The thermal management device can be configured to operate according to a fifth operating mode illustrated in [Fig.8].

[0116] In this fifth operating mode, the refrigerant fluid circuit X is in operation such that high-pressure refrigerant circulates in the combined heat exchanger 4 and the low-pressure refrigerant circulates in both the first 8 and the second 12 bi-fluid heat exchanger.

[0117] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates through the combined heat exchanger 4 and the radiator 10 via the third bypass pipe 23.

[0118] The heat transfer fluid set in motion by the second pump 6 circulates between the first bi-fluid heat exchanger 8 and the heat exchanger thermally coupled with the batteries 7.

[0119] At the outlet of the heat exchanger thermally coupled with the batteries 7, part of the heat transfer fluid joins the first bifluid heat exchanger 8 and another part of the heat transfer fluid passes through the first bypass pipe 21 to join the third loop C and cross the second bifluid heat exchanger 12.

[0120] At the outlet of the second two-fluid heat exchanger 12, the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries 7 via the second bypass pipe 22.

[0121] The heat transfer fluid set in motion by the fourth pump 14 also circulates within the seventh bypass pipe 27 between the heat exchanger with the electrical power chain 15 and the radiator 10.

[0122] The heat transfer fluid thus circulates in parallel in the first 8 and the second 12 two-fluid heat exchangers. As it passes through these two two-fluid heat exchangers 8 and 12, the heat transfer fluid transfers heat energy to the refrigerant of the refrigerant circuit X and is cooled. As it passes through the heat exchanger thermally coupled to the coils 7, the heat transfer fluid recovers heat energy by cooling the coils.

[0123] As it passes through the combined heat exchanger 4, the heat transfer fluid recovers the heat energy from the refrigerant that the refrigerant in the refrigerant circuit X has recovered via the first 8 and second 12 two-fluid heat exchangers. The heat transfer fluid then releases this heat energy via the radiator 10, for example into the external airflow.

[0124] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then rejoins the heat transfer fluid from the combined heat exchanger 4 to subsequently release this heat energy via the radiator 10.

[0125] The fact that the two bifluid heat exchangers 8, 12 are used in parallel increases the thermal cooling capacity. The batteries are then actively cooled with increased thermal capacity, for example to cover the cooling requirements associated with fast battery charging.

[0126] In the case where the second loop B includes an electric heating element 16, in this mode of operation, the latter is at rest and is passively traversed by the heat transfer fluid.

[0127] Sixth mode of operation:

[0128] The thermal management device can be configured to operate according to a sixth operating mode illustrated in [Fig.9].

[0129] In this sixth mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in the first bi-fluid heat exchanger 8.

[0130] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates between the combined heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5.

[0131] The heat transfer fluid set in motion by the fourth pump 14 circulates between the heat exchanger with the electrical power chain 15, the eighth bypass line 28, the first two-fluid heat exchanger 8, the sixth bypass line 26 and the ninth bypass line 29, here via the first bypass line 21.

[0132] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then returns to the first two-fluid heat exchanger 8 via the eighth bypass line 28. As it passes through the first two-fluid heat exchanger 8, the heat transfer fluid releases heat energy to the refrigerant of the refrigerant circuit X.

[0133] By passing through the joint heat exchanger 4, the heat transfer fluid recovers the heat energy from the refrigerant fluid which the refrigerant fluid of the refrigerant circuit X has recovered via the first two-fluid heat exchanger 8. The heat transfer fluid then passes through the first heat exchanger thermally coupled to an airflow 5 where it gives up heat energy, for example into the internal airflow to heat the passenger compartment.

[0134] This sixth operating mode thus makes it possible to recover heat energy from the electrical power chain to heat the passenger compartment.

[0135] In the case where the second loop B includes an electric heating element 16, in this mode of operation, the latter is at rest and is passively traversed by the heat transfer fluid.

[0136] Seventh mode of operation:

[0137] The thermal management device can be configured to operate according to a seventh operating mode illustrated in [Fig. 10].

[0138] In this seventh mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in the first bi-fluid heat exchanger 8.

[0139] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates between the combined heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5.

[0140] The heat transfer fluid set in motion by the second pump 6 circulates between the first two-fluid heat exchanger 8 and the heat exchanger thermally coupled with the batteries 7.

[0141] At the outlet of the heat exchanger thermally coupled with the batteries 7, part of the heat transfer fluid joins the first bi-fluid heat exchanger 8 and another part of the heat transfer fluid passes through the ninth bypass pipe 29, here via the first bypass pipe 21, to cross the heat exchanger with the electrical power chain 15.

[0142] At the outlet of the heat exchanger with the electrical power chain 15, the heat transfer fluid joins the heat transfer fluid inlet of the first two-fluid heat exchanger 8 via the eighth bypass line 28.

[0143] As it passes through the heat exchanger thermally coupled to the batteries 7, the heat transfer fluid recovers heat energy by cooling the batteries. The heat transfer fluid then returns to the first two-fluid heat exchanger 8.

[0144] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then returns to the first two-fluid heat exchanger 8 via the eighth bypass line 28.

[0145] By passing through the first two-fluid heat exchanger 8, the heat transfer fluid, coming from both the heat exchanger thermally coupled with the batteries 7 and the heat exchanger with the electrical power chain 15, gives up heat energy to the refrigerant of the refrigerant circuit X.

[0146] By passing through the joint heat exchanger 4, the heat transfer fluid recovers the heat energy that the refrigerant fluid of the refrigerant circuit X has recovered via the first bi-fluid heat exchanger 8. The heat transfer fluid then passes through the first heat exchanger thermally coupled to an airflow 5 where it gives up heat energy, for example into the internal airflow to heat the passenger compartment.

[0147] This seventh operating mode thus makes it possible to recover heat energy from the electrical power chain as well as from the batteries to heat the passenger compartment.

[0148] In the case where the second loop B includes an electric heating element 16, in this mode of operation, the latter is at rest and is passively traversed by the heat transfer fluid.

[0149] According to a variant of this seventh operating mode illustrated in [Fig. 11], the second loop B includes an electric heating element 16. The electric heating element 16 of the heat transfer fluid can thus be in operation and add heat energy to the heat transfer fluid passing through the first two-fluid heat exchanger 8. This heat energy is added to that recovered from the batteries and the electrical power chain in order to further heat the passenger compartment via the heat exchanger thermally coupled to an airflow 5.

[0150] Eighth mode of operation:

[0151] The thermal management device can be configured to operate according to an eighth operating mode illustrated in [Fig. 12].

[0152] In this eighth operating mode, the refrigerant fluid circuit X is at a standstill.

[0153] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the fourth pump 14 circulates in the heat exchanger with the electrical power chain 15 and joins the heat transfer fluid inlet of the first two-fluid heat exchanger 8 via the eighth bypass pipe 28. The heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries 7. At the outlet of the heat exchanger thermally coupled with the batteries 7, the heat transfer fluid passes through the ninth bypass pipe 29, here via the first bypass pipe 21, to join the heat exchanger with the electrical power chain 15.

[0154] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then returns to the first two-fluid heat exchanger 8 via the eighth bypass line 28. Since the refrigerant circuit X is off, the heat transfer fluid passively passes through the first two-fluid heat exchanger 8 without any heat exchange.

[0155] By passing through the heat exchanger thermally coupled with the batteries 7, the heat transfer fluid releases heat energy by heating the batteries.

[0156] This eighth mode of operation thus makes it possible to recover heat energy from the electrical power chain in order to heat the batteries.

[0157] Ninth operating mode:

[0158] The thermal management device can be configured to operate according to a ninth operating mode illustrated in [Fig. 13].

[0159] In this ninth mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in both the first 8 and the second 12 bi-fluid heat exchanger.

[0160] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates between the combined heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5.

[0161] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the fourth pump 14 circulates in the heat exchanger with the electrical power chain 15 and joins the heat transfer fluid inlet of the first bi-fluid heat exchanger 8 via the eighth bypass line 28, the heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries 7.

[0162] At the outlet of the heat exchanger thermally coupled with the batteries 7, the heat transfer fluid passes through the ninth bypass line 29, here via the first bypass line 21, for the heat exchanger with the electrical power chain 15.

[0163] The heat transfer fluid set in motion by the second pump 6 also circulates between the second two-fluid heat exchanger 12, the fifth bypass pipe 25, the radiator 10 and the fourth bypass pipe 24.

[0164] As it passes through the radiator 10, the heat transfer fluid recovers heat energy, for example from the external airflow. This heat energy is transferred to the refrigerant of the refrigerant circuit via the second two-fluid heat exchanger 12.

[0165] As it passes through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the electrical power chain. The heat transfer fluid then returns to the first two-fluid heat exchanger 8 via the eighth bypass line 28. As it passes through the first two-fluid heat exchanger 8, some of this heat energy is transferred to the refrigerant of the refrigerant circuit X. The remaining heat energy is then transferred to the batteries to heat them via the heat exchanger thermally coupled to the batteries 7.

[0166] By passing through the combined heat exchanger 4, the heat transfer fluid recovers the heat energy that the refrigerant of the refrigerant circuit X has recovered via the first two-fluid heat exchanger 8. The heat transfer fluid then passes through the first heat exchanger thermally coupled to an airflow 5 where it releases heat energy, for example into the internal airflow to heat the passenger compartment.

[0167] This ninth operating mode thus makes it possible to recover heat energy from the electrical power chain to heat the batteries, but also to recover heat energy from the electrical power chain and from the outside to heat the passenger compartment.

[0168] Tenth mode of operation:

[0169] The thermal management device can be configured to operate according to a tenth operating mode illustrated in [Fig. 14].

[0170] In this tenth mode of operation, the refrigerant circuit X is in operation such that high-pressure refrigerant flows in the joint heat exchanger 4 and low-pressure refrigerant flows in the second bi-fluid heat exchanger 12.

[0171] The heat transfer fluid set in motion by the first pump 3 circulates between the joint heat exchanger 4 and the first heat exchanger thermally coupled to an airflow 5.

[0172] The heat transfer fluid set in motion by the third pump 11 circulates between the second two-fluid heat exchanger 12 and the second heat exchanger thermally coupled to an airflow 13.

[0173] The heat transfer fluid set in motion by the fourth pump 14 also circulates within the seventh bypass pipe 27 between the heat exchanger with the electrical power chain 15 and the radiator 10.

[0174] As it passes through the second heat exchanger thermally coupled to an airflow 13, the refrigerant recovers heat energy from the internal airflow by cooling it. This heat energy is then transferred to the refrigerant of the refrigerant circuit X via the second two-fluid heat exchanger 12.

[0175] By passing through the joint heat exchanger 4, the heat transfer fluid recovers the heat energy that the refrigerant fluid of the refrigerant circuit X has recovered via the second bi-fluid heat exchanger 12. The heat transfer fluid then passes through the first heat exchanger thermally coupled to an airflow 5 where it gives up heat energy, for example in the internal airflow heating the latter.

[0176] Alternating between cooling the internal airflow via the first air exchanger 5 and then heating the same internal airflow via the second heat exchanger thermally coupled to an airflow 13 allows dehumidification of the internal airflow.

[0177] By passing through the heat exchanger with the electrical power chain 15, the heat transfer fluid recovers heat energy by cooling the chain of electrical power. The fluid then releases this heat energy via the radiator 10.

[0178] This tenth operating mode thus allows both cooling of the electrical power chain and dehumidification of the internal airflow, for example, to the passenger compartment.

[0179] Eleventh mode of operation:

[0180] The thermal management device can be configured to operate according to an eleventh operating mode illustrated in [Fig. 15].

[0181] In this eleventh operating mode, the refrigerant circuit X is functioning such that high-pressure refrigerant circulates in the combined heat exchanger 4 and refrigerant circulates in the first 8 and second 12 dual-fluid heat exchangers. This operation of the refrigerant circuit X allows for a pressure increase in the refrigerant and thus an increase in its temperature.

[0182] Within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump 3 circulates between the joint heat exchanger 4 and the radiator 10 via the third bypass pipe 23.

[0183] The heat transfer fluid set in motion by the fourth pump 14 circulates within the seventh bypass pipe 27, between the heat exchanger with the electrical power chain 15 and the radiator 10.

[0184] The heat transfer fluid set in motion by the second pump 6 also circulates in the electric heating element 16 of the operating heat transfer fluid. The heat transfer fluid then rises the eighth bypass pipe 28 to join the seventh bypass pipe 27 and the radiator 10.

[0185] At the outlet of the radiator 10, part of the heat transfer fluid joins the fourth bypass pipe 24 in order to then go up the first bypass pipe 21 to join the second loop B. The rest of the heat transfer fluid at the outlet of the radiator 10 joins respectively the heat transfer fluid inlet of the first two-fluid heat exchanger 8 and the seventh bypass pipe 27.

[0186] As it passes through the electric heating element 16, the combined heat exchanger 4, and the heat exchanger with the power chain 15, the heat transfer fluid absorbs heat energy. The heat transfer fluid from these exchangers 16, 4, and 15 then flows to the radiator 10, transferring this heat energy. This allows, for example, the radiator 10 to be heated in order to defrost it.

[0187] Thus, it is clear that, due to the architecture of its heat transfer fluid circuit, the thermal management device allows, in particular, improved cooling of the batteries, especially when the latter are in fast charging.

Claims

1. Demands Thermal management device for an electric or hybrid motor vehicle comprising a heat transfer fluid circuit and a refrigerant fluid circuit (X) in which a refrigerant fluid is intended to circulate, said refrigerant fluid circuit (X) comprising, in the direction of refrigerant flow, a compressor (101), a combined heat exchanger (4) jointly disposed on the heat transfer fluid circuit, a first bi-fluid heat exchanger (8) jointly disposed on the heat transfer fluid circuit, the refrigerant fluid circuit (X) comprising a first expansion device (102) disposed upstream of the first bi-fluid heat exchanger (8), the refrigerant fluid circuit (X) further comprising, a branch (X') connected in parallel to the first bi-fluid heat exchanger (8) and the first expansion device (102), said branch (X') comprising a second bi-fluid heat exchanger (12),arranged jointly on the heat transfer fluid circuit, and a second expansion device (103) arranged upstream of the second two-fluid heat exchanger (12), the heat transfer fluid circuit comprising: - a first loop (A) comprising, a first pump (3), the combined heat exchanger (4) and a first heat exchanger thermally coupled to an airflow (5), - a second loop (B) comprising a second pump (6), the first two-fluid heat exchanger (8) and a heat exchanger thermally coupled with the batteries (7), - a third loop (C) comprising a third pump (11), the second two-fluid heat exchanger (12) and a second heat exchanger thermally coupled to an airflow (13), - a first bypass pipe (21) connecting the heat transfer fluid outlet of the heat exchanger thermally coupled with the coils (7) to the heat transfer fluid inlet of the second two-fluid heat exchanger (12), - a second bypass pipe (22) connecting the heat transfer fluid outlet of the second two-fluid heat exchanger (12) to the heat transfer fluid inlet of the heat exchanger thermally coupled with the coils (7),

2. - a first redirection device (41) of the heat transfer fluid configured to redirect the heat transfer fluid at the outlet of the second two-fluid heat exchanger (12) to the second bypass line (22) or to the heat transfer fluid inlet of the second heat exchanger thermally coupled to an airflow (13), - a third bypass line (23) connecting the heat transfer fluid outlet of the joint heat exchanger (4) to the heat transfer fluid inlet of the heated joint heat exchanger (4), said third bypass line (23) having a radiator (10), - a second redirection device (42) configured to redirect the heat transfer fluid at the outlet of the heated joint heat exchanger (4) to the first heat exchanger thermally coupled to an airflow (5) or to the third bypass line (23). - a fourth bypass pipe (24) connecting the heat transfer fluid outlet of the radiator (10) to the heat transfer fluid inlet of the second two-fluid heat exchanger (12), - a fifth bypass pipe (25) connecting the heat transfer fluid outlet of the second two-fluid heat exchanger (12) to the heat transfer fluid inlet of the radiator (10), - a third redirection device (43) configured to redirect the heat transfer fluid at the outlet of the second two-fluid heat exchanger (12), passing through the second bypass pipe (22), towards the second loop (B) or towards the fifth bypass pipe (25). Thermal management device according to the preceding claim, characterized in that it is configured to operate in a first operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the combined heat exchanger (4) and low-pressure refrigerant circulates in both the first (8) and second (12) dual-fluid heat exchanger, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the combined heat exchanger (4) and the radiator (10) via the third bypass pipe (23), The heat transfer fluid set in motion by the second pump (6) circulates between the first two-fluid heat exchanger (8) and the heat exchanger thermally coupled with the batteries (7). At the outlet of the heat exchanger thermally coupled with the batteries (7), part of the heat transfer fluid joins the first two-fluid heat exchanger (8) and another part of the heat transfer fluid passes through the first bypass pipe (21) to join the third loop (C) and pass through the second two-fluid heat exchanger (12). At the outlet of the second two-fluid heat exchanger (12), the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries (7) via the second bypass pipe (22).

3. Thermal management device according to any one of the preceding claims, characterized in that the second loop (B) comprises an electric heating element (16) for the heat transfer fluid arranged upstream of the first two-fluid heat exchanger (8).

4. Thermal management device according to the preceding claim, characterized in that it is configured to operate in a second operating mode in which: the refrigerant circuit (X) is stopped, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump (6) circulates in the second loop (B) between the electric heating element (16) which is in operation, the first two-fluid heat exchanger (8) and the heat exchanger thermally coupled with the batteries (7).

5. A thermal management device according to any one of the preceding claims, characterized in that the heat transfer fluid circuit comprises: - a sixth bypass line (26) bypassing the heat exchanger thermally coupled with the coils (7), connecting the heat transfer fluid inlet of said heat exchanger thermally coupled with the coils (7) to its heat transfer fluid outlet on the second loop (B), - a fourth redirection device (44) configured to redirect the heat transfer fluid arriving at the heat exchanger thermally coupled with the coils (7) to the sixth line bypass (26) or to the heat exchanger thermally coupled with the batteries (7).

6. Thermal management device according to the preceding claim, characterized in that it is configured to operate in a third operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant flows in the joint heat exchanger (4) and low-pressure refrigerant flows in the first two-fluid heat exchanger (8), within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) flows between the joint heat exchanger (4) and the first heat exchanger thermally coupled to an airflow (5), the heat transfer fluid set in motion by the second pump (6) flows between the electric heating element (16) which is in operation, the first two-fluid heat exchanger (8) and the sixth bypass line (26).

7. Thermal management device according to any one of the preceding claims, characterized in that the heat transfer fluid circuit comprises: - a seventh bypass line (27) connecting the heat transfer fluid outlet of the radiator (10) to the heat transfer fluid inlet of the radiator (10), said seventh bypass line (27) comprising a heat exchanger with the electrical power chain (15) of the motor vehicle, - an eighth bypass line (28) connecting the heat transfer fluid outlet of the heat exchanger with the electrical power chain (15) to the heat transfer fluid inlet of the first two-fluid heat exchanger (8), - a fifth redirection device (45) configured to redirect the heat transfer fluid at the outlet of the heat exchanger with the electrical power chain (15) to the radiator (10) or to the eighth bypass line (28),- a ninth bypass pipe (29) connecting the heat transfer fluid outlet of the heat exchanger thermally coupled with the batteries (7) or the sixth bypass pipe (26) to the heat transfer fluid inlet of the heat exchanger with the electrical power chain (15), the seventh bypass pipe (27) further comprising a fourth pump (14) disposed upstream or downstream of the heat exchanger with the electrical power chain (15) between the eighth (28) and ninth (29) bypass pipe.

8. Thermal management device according to the preceding claim, characterized in that it is configured to operate in a fourth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the joint heat exchanger (4) and low-pressure refrigerant circulates in both the first (8) and the second (12) dual-fluid heat exchanger, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the second pump (6) circulates between the first dual-fluid heat exchanger (8) and the heat exchanger thermally coupled with the coils (7), the heat transfer fluid set in motion by the first pump (3) circulates between the joint heat exchanger (4) and the radiator (10) via the third bypass line (23),and the heat transfer fluid set in motion by the fourth pump (14) also circulates within the seventh bypass pipe (27), between the heat exchanger with the electrical power chain (15) and the radiator (10).

9. Thermal management device according to any one of claims 7 or 8, characterized in that it is configured to operate in a fifth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the joint heat exchanger (4) and low-pressure refrigerant circulates in both the first (8) and the second (12) dual-fluid heat exchanger, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the joint heat exchanger (4) and the radiator (10) via the third bypass line (23), the heat transfer fluid set in motion by the second pump (6) circulates between the first dual-fluid heat exchanger (8) and the heat exchanger thermally coupled to the coils (7),

10.

11. At the outlet of the heat exchanger thermally coupled with the batteries (7), part of the heat transfer fluid joins the first two-fluid heat exchanger (8) and another part of the heat transfer fluid passes through the first bypass pipe (21) to join the third loop (C) and through the second two-fluid heat exchanger (12). At the outlet of the second two-fluid heat exchanger (12), the heat transfer fluid joins the heat transfer fluid inlet of the heat exchanger thermally coupled with the batteries (7) via the second bypass pipe (22). The heat transfer fluid set in motion by the fourth pump (14) also circulates within the seventh bypass pipe (27), between the heat exchanger with the electrical power chain (15) and the radiator (10). Thermal management device according to any one of claims 7 to 9, characterized in that it is configured to operate in a sixth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the combined heat exchanger (4) and low-pressure refrigerant circulates in the first two-fluid heat exchanger (8), within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the combined heat exchanger (4) and the first heat exchanger thermally coupled to an airflow (5), the heat transfer fluid set in motion by the fourth pump (14) circulates between the heat exchanger with the electrical power chain (15), the eighth bypass line (28), the first two-fluid heat exchanger (8),the sixth bypass pipe (26) and the ninth bypass pipe (29). Thermal management device according to any one of claims 7 to 10, characterized in that it is configured to operate in a seventh operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant flows in the joint heat exchanger (4) and low-pressure refrigerant flows in the first bi-fluid heat exchanger (8), within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the combined heat exchanger (4) and the first heat exchanger thermally coupled to an airflow (5), the heat transfer fluid set in motion by the second pump (6) circulates between the first bi-fluid heat exchanger (8) and the heat exchanger thermally coupled with the batteries (7), at the outlet of the heat exchanger thermally coupled with the batteries (7), part of the heat transfer fluid joins the first bi-fluid heat exchanger (8) and another part of the heat transfer fluid passes through the ninth bypass pipe (29) to cross the heat exchanger with the electrical power chain (15), at the outlet of the heat exchanger with the electrical power chain (15),The heat transfer fluid joins the heat transfer fluid inlet of the first two-fluid heat exchanger (8) via the eighth bypass pipe (28).

12. Thermal management device according to the preceding claim in combination with claim 3, characterized in that the electric heating element (16) of the heat transfer fluid is in operation.

13. Thermal management device according to any one of claims 7 to 12, characterized in that it is configured to operate in an eighth operating mode in which: the refrigerant circuit (X) is at rest, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the fourth pump (14) circulates in the heat exchanger with the electrical power chain (15) and joins the heat transfer fluid inlet of the first two-fluid heat exchanger (8) via the eighth bypass line (28), the heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries (7) and, at the outlet of the heat exchanger thermally coupled with the batteries (7), the heat transfer fluid passes through the ninth bypass line (29) to join the heat exchanger with the electrical power chain (15).

14.

15. Thermal management device according to any one of claims 7 to 13, characterized in that it is configured to operate in a ninth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the combined heat exchanger (4) and low-pressure refrigerant circulates in both the first (8) and the second (12) dual-fluid heat exchanger, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the combined heat exchanger (4) and the first heat exchanger thermally coupled to an airflow (5), within the heat transfer fluid circuit,The heat transfer fluid set in motion by the fourth pump (14) circulates in the heat exchanger with the electrical power chain (15) and joins the heat transfer fluid inlet of the first two-fluid heat exchanger (8) via the eighth bypass pipe (28). The heat transfer fluid then passes through the heat exchanger thermally coupled with the batteries (7). At the outlet of the heat exchanger thermally coupled with the batteries (7), the heat transfer fluid passes through the ninth bypass pipe (29) to join the heat exchanger with the electrical power chain (15). The heat transfer fluid set in motion by the third pump (11) also circulates between the second two-fluid heat exchanger (12), the fifth bypass pipe (25), the radiator (10) and the fourth bypass pipe (24). Thermal management device according to any one of claims 7 to 14, characterized in that it is configured to operate in a tenth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the joint heat exchanger (4) and low-pressure refrigerant circulates in the second bi-fluid heat exchanger (12), the heat transfer fluid set in motion by the first pump (3) circulates between the joint heat exchanger (4) and the first heat exchanger thermally coupled to an airflow (5),

16. the heat transfer fluid set in motion by the third pump (11) circulates between the second two-fluid heat exchanger (12) and the second heat exchanger thermally coupled to an airflow (13), The heat transfer fluid set in motion by the fourth pump (14) also circulates within the seventh bypass pipe (27), between the heat exchanger with the electrical power chain (15) and the radiator (10). Thermal management device according to any one of claims 7 to 15 in combination with claim 3, characterized in that it is configured to operate in a twelfth operating mode in which: the refrigerant circuit (X) is in operation such that high-pressure refrigerant circulates in the combined heat exchanger (4) and refrigerant in the first (8) and second (12) dual-fluid heat exchangers, within the heat transfer fluid circuit, the heat transfer fluid set in motion by the first pump (3) circulates between the combined heat exchanger (4) and the radiator (10) via the third bypass pipe (23), the heat transfer fluid set in motion by the fourth pump (14) circulates on the other hand within the seventh bypass pipe (27) between the heat exchanger with the electrical power chain (15) and the radiator (10), the heat transfer fluid set in motion by the second pump (6) also circulates between the electric heating element (16) of the operating heat transfer fluid, the heat transfer fluid then goes up the eighth bypass pipe (28) to join the seventh bypass pipe (27) and the radiator (10), at the outlet of the radiator (10) part of the heat transfer fluid joins the fourth bypass pipe (24) in order to then go up the first bypass pipe (21) to join the second loop (B).