FR3126756A1 - Thermal management device for modular platform of an electric motor vehicle chassis - Google Patents

Abstract

Thermal management device for a modular platform (A) of an electric motor vehicle chassis, the thermal management device comprising:- a first module (M1), comprising a compressor (41), a first expansion device (43) and a multi-fluid heat exchanger (1) of a first heat transfer fluid circuit (X), said first module (M1) being intended to be integrated within the modular platform (A), - a cooling module (C ) comprising at least a first heat exchanger (62, 42'), said cooling module (C) being intended to be integrated within the modular platform (A), - a heating, ventilation and air conditioning device (D) comprising a cooler (66, 46), a second heat exchanger (65, 47) and ventilation means (D1) configured to generate said internal air flow (400), - a second module (M2) comprising at least a first pump (61) of a second heat transfer fluid circuit (Y), and- a e heat exchange interface (BAT) with the batteries (B), the various modules (M1, M2), the cooling module (C), the heating, ventilation and air conditioning device (D) and the heat exchange interface (BAT) with the batteries (B) being connected to each other so as to form heat transfer fluid circuits (X, Y Z) interconnected. Abstract Figure, Figure 4

Description

Thermal management device for modular platform of an electric motor vehicle chassis

The present invention relates to the field of thermal management devices for electric vehicles and more particularly thermal management devices for a modular platform of an electric motor vehicle chassis.

In the automotive field and in particular in the field of electric motor vehicles, for reasons of standardization and economy of scale, it is sometimes possible to use modular platforms for the chassis of an electric motor vehicle. Such modular platforms include in particular the batteries, the electric power train as well as the cycle part, in particular the wheels, the braking and suspension system of the motor vehicle. By electric power train of the motor vehicle, we mean more precisely the electric power as well as the electric motor or motors of the motor vehicle. Such a modular platform is used in order to have a single platform, grouping together most of the propulsion, power supply and electrical storage components on which various passenger compartments and bodywork are installed, corresponding to different models of motor vehicles.

However, in order to improve the autonomy of the electric vehicle, a large part of the space within this modular platform is reserved for the batteries. There is then little space left to integrate a thermal management device allowing thermal management of both the batteries and the passenger compartment. Conventional thermal management devices are generally bulky and require significant space to be integrated into a motor vehicle. These thermal management devices are not well suited for integration within such a modular platform.

One of the aims of the present invention is therefore to at least partially remedy the drawbacks of the prior art and to propose an improved thermal management device that can be integrated within such a modular platform.

The present invention therefore relates to a thermal management device for a modular platform of an electric motor vehicle chassis, said modular platform comprising the batteries as well as the electric power train of the electric motor vehicle, the thermal management device comprising:
- a first module, comprising a compressor, a first expansion device and a multi-fluid heat exchanger of a first heat transfer fluid circuit within which a first heat transfer fluid is intended, said first module being intended to be integrated within of the modular platform,
- a cooling module comprising at least a first heat exchanger intended to be crossed by the external air flow, said cooling module being intended to be integrated within the modular platform,
- a heating, ventilation and air conditioning device intended to be traversed by an internal air flow intended for a passenger compartment, said heating, ventilation and air conditioning device comprising a cooler, intended to cool the flow of internal air, a second heat exchanger, intended to heat the internal air flow, and a ventilation means configured to generate said internal air flow,
- a second module comprising at least a first pump of a second heat transfer fluid circuit within which a second heat transfer fluid is intended, and
- a heat exchange interface with the batteries,
the various modules, the cooling module, the heating, ventilation and air conditioning device and the heat exchange interface with the batteries being connected to each other so as to form interconnected heat transfer fluid circuits.

According to one aspect of the invention, the heating, ventilation and air conditioning device is intended to be arranged outside the modular platform, said thermal management device comprising a connection interface intended to allow fluid connection of the heating, ventilation and air conditioning to the first and/or second heat transfer fluid circuit.

According to another aspect of the invention, the first module further comprises a first heat exchanger acting as a condenser of the first heat transfer fluid circuit,
the first heat exchanger of the cooling module being a first heat exchanger of the second heat transfer fluid circuit
the second module comprising a second pump of the second heat-transfer fluid circuit supplying the first heat exchanger of the first module acting as a condenser of the first heat-transfer fluid circuit.

According to another aspect of the invention, the second module is placed side by side with the first module, said first module and second module being intended to be placed within the modular platform.

According to another aspect of the invention, the second module is remote from the first module, said second module being intended to be placed outside the modular platform between the connection interface and the heating, ventilation and air conditioning.

According to another aspect of the invention, the cooler of the heating, ventilation and air conditioning device is a cooler of the second heat transfer fluid circuit.

According to another aspect of the invention, the cooler of the heating, ventilation and air conditioning device is an evaporator of the first heat transfer fluid circuit.

According to another aspect of the invention, the second heat exchanger of the heating, ventilation and air conditioning device is a second heat exchanger of the second heat transfer fluid circuit.

According to another aspect of the invention, the first heat exchanger of the cooling module is a first heat exchanger of the first heat transfer fluid circuit.

According to another aspect of the invention, the second module is placed side by side with the first module, said first module and second module being intended to be placed within the modular platform.

According to another aspect of the invention, the second heat exchanger of the heating, ventilation and air conditioning device is an internal condenser of the first heat transfer fluid circuit.

According to another aspect of the invention, the first heat transfer fluid circuit comprises an expansion valve arranged upstream of the first heat exchanger of the cooling module as well as devices for managing the flow of the first heat transfer fluid, said expansion valve. expansion as well as said management devices being grouped together within the same block for circulation and management of the first heat transfer fluid.

The present invention also relates to a modular platform of an electric motor vehicle chassis, said modular platform comprising the batteries as well as the electric power train of the electric motor vehicle, said modular platform comprising a thermal management device as described above.

Other characteristics and advantages of the present invention will appear more clearly on reading the following description, provided by way of illustration and not limitation, and the appended drawings in which:

There is a semi-transparent schematic representation of a modular platform according to a first embodiment,

there is a perspective schematic representation of a cooling module,

there is a schematic representation in perspective of a heating, ventilation and air conditioning device,

there is a schematic representation of a thermal management device according to a first variant of a first embodiment,

there is a schematic representation of a thermal management device according to a second variant of the first embodiment,

There is a semi-transparent schematic representation of a modular platform according to a second embodiment,

there is a schematic representation of a thermal management device according to a second embodiment,

there is a schematic representation of a thermal management device according to a variant of the ,

there is a schematic representation of a thermal management device according to a variant of the .

In the various figures, identical elements bear the same reference numbers.

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

In the present description, it is possible to index certain elements or parameters, such as for example first element or second element as well as first parameter and second parameter or else first criterion and second criterion, etc. In this case, it is a simple indexing to differentiate and name elements or parameters or criteria that are close, but not identical. This indexing does not imply a priority of one element, parameter or criterion over another and such denominations can easily be interchanged without departing from the scope of the present description. Nor does this indexing imply an order in time, for example, to assess such and such a criterion.

In the present description, “placed upstream” means that one element is placed before another with respect to the direction of circulation of a fluid. Conversely, “placed downstream” means that one element is placed after another in relation to the direction of fluid circulation.

There shows a modular platform A for the chassis of an electric motor vehicle. This modular platform A comprises in particular the batteries B, the electric power train as well as the cycle part of the motor vehicle, for example the wheels, the braking and suspension system. By electric power train of the motor vehicle, is meant more specifically the electric power as well as the electric motor or motors of the motor vehicle. Such a modular platform A is used in particular in order to have a platform on which various passenger compartments and bodies can be installed.

In order to allow the thermal management of the batteries B as well as that of the passenger compartment, the modular platform A comprises a thermal management device comprising at least two heat transfer fluid circuits X, Y (visible in Figures 4, 5 and 7 to 9 ). The thermal management device more particularly comprises different modules fluidly connected to each other in order to form the different circuits of heat transfer fluids X, Y.

The thermal management device thus comprises a first module M1. This first module M1 comprises in particular a compressor 41, a first expansion device 43 and a multi-fluid heat exchanger 1 of a first heat transfer fluid circuit X (see ). The first heat transfer fluid circuit X will be described in more detail later in this description. The first module M1 is more particularly intended to be integrated within the modular platform A. The components of the first module M1 can more particularly be grouped together, for example within a box in order to limit the place of the latter within the modular platform A.

The thermal management device also comprises a cooling module C being intended to be traversed by an external air flow 500. The cooling module C notably comprises at least one first heat exchanger 62, 42' (see ) also intended to be traversed by the external air flow 500. This cooling module C is intended to be integrated within the modular platform A, preferably in the front part of the modular platform.

An example of such a cooling module C is particularly illustrated in . The cooling module C can thus comprise a heat exchanger 62, 42' and a first manifold box C41 attached to said heat exchanger 62, 42'. The first collector box C41 preferably forms a volute with a first open end C41a placed facing the heat exchanger 62, 42' and a second open end C41b at the opposite end of the volute.

The cooling module C can also comprise at least one tangential fan, also called tangential turbomachine C30, configured so as to generate the external air flow 500 , for example when the motor vehicle is stopped or when it is at a low speed. The C30 tangential turbomachine comprises a C28 rotor or turbine (or tangential propeller). The C28 turbine has a substantially cylindrical shape. The turbine C28 advantageously comprises several stages of blades (or blades). The turbine C28 is rotatably mounted around an axis of rotation Cy, for example parallel to the plane formed by the heat exchanger 62, 42' and extending across its width. The turbine C28 is more particularly arranged within the volute formed by the first collector casing. The C30 tangential turbomachine is thus compact. The use of such a tangential turbomachine C30 notably allows the external air flow 500 to be equal over the entire width of at least one heat exchanger 62, 42'. In addition, such a C30 tangential turbomachine saves space compared to conventional fans.

The tangential turbomachine C30 can also comprise a motor C31 configured to set the turbine in rotation. Motor C31 is for example adapted to drive the turbine in rotation, at a speed of between 200 revolutions/min and 14,000 revolutions/min. Such speeds of rotation make it possible in particular to limit the noise generated by the tangential turbomachine C30.

In the example shown in , the tangential turbomachine C30 is configured to operate in suction mode, that is to say it sucks in ambient air so that it passes through the heat exchanger 62, 42 and is evacuated through the second open end C41b of the scroll. Alternatively, the tangential turbomachine C30 can operate by discharge, ie blowing air from the second open end C41b of the volute towards the heat exchanger 62, 42'.

The cooling module C can also include a second collector box (not shown) attached to the heat exchanger 62, 42' on its face opposite to that comprising the first collector box C41. This second manifold box may include an opening to allow the external air flow 500 to pass. This opening may include a shutter device (not shown) movable between a first so-called open position and a second so-called closed position. This shutter device is configured in particular to allow the external air flow 500 to pass through said opening in its open position and to close said opening in its closed position. The closure device can be in different forms, such as for example in the form of a plurality of flaps mounted to pivot between an open position and a closed position. These shutters are preferably mounted parallel to the width of the cooling module C. Nevertheless, it is quite possible to imagine other configurations such as, for example, shutters mounted parallel to the height of the cooling module. The shutters can be flag type shutters but other types of shutters such as butterfly shutters are quite possible.

The thermal management device also comprises a heating, ventilation and air conditioning device D intended to be traversed by an internal air flow 400 destined for a passenger compartment. Such a heating, ventilation and air conditioning device D is illustrated in . The heating, ventilation and air conditioning device D comprises in particular, within a box, a cooler 66, 46, intended to cool the internal air flow 400, a second heat exchanger 65, intended to heat the internal airflow 400, and a ventilation means D1 configured to generate the internal airflow 400.

The heating, ventilation and air conditioning device D can in particular be placed outside the modular platform A, for example within a passenger compartment installed on said modular platform A. In this case, the management device circuit comprises a connection interface I intended to allow the fluidic connection of the heating, ventilation and air conditioning device D to heat transfer fluid circuits X, Y and to the elements of the thermal management device arranged within the modular platform A .

Figures 4 to 5 and 7 to 9 show different architectures of heat transfer fluid circuits X, Y, Z.

Figures 4 to 5 and 7 show different examples of thermal management devices comprising three circulation circuits each connected to a multi-fluid heat exchanger 1, here tri-fluid. The thermal management device thus comprises a first heat transfer fluid circuit X, a second heat transfer fluid circuit X and a third heat transfer fluid circuit Z.

Within the first heat transfer fluid circuit X is intended to circulate a first heat transfer fluid, in particular a refrigerant fluid, for example CO2, R134a or even R1234y. The first heat transfer fluid circuit X more particularly comprises a main loop X1 comprising, in the direction of circulation of the refrigerant fluid, a compressor 41, a first heat exchanger 42, 42', a first expansion device 43 and the heat exchanger. tri-fluid heat 1.

Within the second heat transfer fluid circuit Y is intended to circulate a second heat transfer fluid, for example water or glycol water. The second heat transfer fluid circuit Y comprises in particular a main loop Y1 comprising a first pump 61, a first heat exchanger 62. The tri-fluid heat exchanger 1 also being connected to said main loop Y1 of the second heat transfer fluid circuit Y .

In the architectures of Figures 4, 5 and 7, the heat exchange interface BAT with the batteries B is arranged within the third heat transfer fluid circuit Z in which a third heat transfer fluid, in particular a dielectric fluid, is intended to circulate. This third heat transfer fluid circuit Z is connected to the tri-fluid heat exchanger 1 and the heat exchange interface BAT is a container in which the batteries are at least partially immersed and/or are subjected to vaporization of the dielectric fluid . The third heat transfer fluid circuit Z may also include a pump (not shown) in order to circulate the dielectric fluid within the heat exchange interface BAT and the circuit itself. This pump can in particular be integrated directly into the BAT heat exchange interface to save space.

The three-fluid heat exchanger 1 is more particularly configured to allow heat exchanges between the second and third heat transfer fluids and the first heat transfer fluid. The use of such a tri-fluid heat exchanger 1 allows, within the same heat exchanger, heat exchanges both between the first heat transfer fluid and the second heat transfer fluid and between the first heat transfer fluid and the third heat transfer fluid. Thus, it is possible with a single heat exchanger to thermally couple three distinct circulation circuits with three heat transfer fluids of different nature. The fact of grouping these heat exchanges within the same tri-fluid heat exchanger 1 also saves space within the motor vehicle compared to a thermal management device with three circulation circuits with a first dedicated heat exchanger heat exchange between the first heat transfer fluid and the second heat transfer fluid and a second heat exchanger dedicated to heat exchange between the first heat transfer fluid and the third heat transfer fluid.

According to a first embodiment illustrated in Figures 4 and 5, the first heat exchanger 42 of the first heat transfer fluid circuit X may be a condenser configured to allow heat exchanges between the first heat transfer fluid of the first heat transfer fluid circuit X and the second heat transfer fluid from the second heat transfer fluid circuit Y. The first heat exchanger 42 is then integrated within the first module M1. Still according to this first embodiment, the first heat exchanger 62 of the second heat transfer fluid circuit Y can itself be a radiator intended to be crossed by an external air flow 500. The first heat exchanger 62 is then integrated within the cooling module C.

In this first embodiment, the second heat transfer fluid circuit Y is configured to allow the absorption of heat from the first heat transfer fluid circuit X via the first heat exchanger 42 of the first heat transfer fluid circuit X. The second circuit of heat transfer fluid Y is also configured to allow the restitution of said heat in the external air flow 500 via the first heat exchanger 62 of the second heat transfer fluid circuit Y and/or in an internal air flow 400 intended for the passenger compartment of the motor vehicle. In order to allow this return of heat into the internal air flow 400, the second heat transfer fluid circuit Y comprises the second heat exchanger 65 intended to be crossed by the internal air flow 400. This second heat exchanger 65 is in particular be integrated within the heating, ventilation and air conditioning device D.

Still according to the first embodiment illustrated in Figures 4 and 5, the second heat transfer fluid circuit Y comprises a first bypass branch Y2 connected to the main loop Y1 in parallel with the first heat exchanger 62 of said second heat transfer fluid circuit Y. More particularly, the first bypass branch Y2 connects a first connection point 81 to a second connection point 82. The first connection point 81 is arranged on the main loop Y1 downstream of the first heat exchanger 62, between said first heat exchanger heat exchanger 62 and the first pump 61. The second connection point 82 is arranged on the main loop Y1 upstream of the first heat exchanger 62, between the three-fluid heat exchanger 1 and said first heat exchanger 62. Said first bypass branch Y2 may in particular comprise a second pump 63 as well as the first heat exchanger 42 of the first heat transfer fluid circuit X. This second pump 63 is more particularly integrated into the second module M2.

The first bypass branch Y2 may also include an electric heater 64 for the second heat transfer fluid disposed downstream of the first heat exchanger 42 of the first heat transfer fluid circuit X. This electric heater 64 may itself be integrated within the first module M1 .

Still according to the first embodiment illustrated in FIGS. 4 and 5, the second heat transfer fluid circuit Y comprises a second bypass branch Y3 connected to the first bypass branch Y2 in parallel with the first heat exchanger 42 of the first heat transfer fluid circuit X and the second pump 63. More particularly, this second branch Y3 connects a third connection point 83 to a fourth connection point 84. The third connection point 83 is arranged on the first branch Y2 downstream of the first heat exchanger 42 of the first heat transfer fluid circuit X and of the second pump 63, upstream of the second connection point 82. The fourth connection point 84 is arranged on the first bypass branch Y2 upstream of the first heat exchanger 42 of the first heat transfer fluid circuit X and of the second pump 63, downstream of the first connection point 81. The second bypass branch Y3 comprises the second heat exchanger 65 of the second heat transfer fluid circuit Y.

In order to control the flow of the second heat-transfer fluid, the second heat-transfer fluid circuit Y may comprise redirecting means such as three-way valves arranged for example:
- on the second connection point 82 so as to redirect the second heat transfer fluid from the three-fluid heat exchanger 1 to the first heat exchanger 62 or the second heat exchanger 62 or so as to redirect the second heat transfer fluid from the third connection point 83 to the first heat exchanger 62,
- on the third connection point 83 so as to redirect the second heat transfer fluid from the second connection point 82 to the second heat exchanger 65 or so as to redirect the second heat transfer fluid from the first heat exchanger 42 of the first heat transfer circuit heat transfer fluid X to the second connection point 82 or to the second heat exchanger 65,
- on the third connection point 83 so as to redirect the second heat transfer fluid from the first heat exchanger 62 or the second heat transfer fluid from the second heat exchanger 65 to the first heat exchanger 42 of the first heat transfer fluid circuit X.
Other means of redirection such as shut-off valves can also be envisaged.

The means for redirecting the second heat transfer fluid from the second 82 and third 83 connection points can advantageously be arranged within the cooling module C, for example respectively at the inlet and at the outlet of the second heat transfer fluid from the first heat exchanger 62 The means for redirecting the second heat transfer fluid from the fourth connection point 84 can for its part be arranged within the first module M1.

According to a first variant of the first embodiment illustrated in , the second heat transfer fluid circuit Y may further comprise a third bypass branch Y4 connected to the main loop Y1 in parallel with the first pump 61 and the three-fluid heat exchanger 1. More particularly, this third branch of branch Y4 connects a fifth connection point 85 to a sixth connection point 86. The fifth connection point 85 is arranged on the main loop Y1 downstream of the three-fluid heat exchanger 1 and the first pump 61 and in upstream of the second connection point 82. The sixth connection point 86 is arranged on the main loop Y1 upstream of the three-fluid heat exchanger 1 and of the first pump 61 and downstream of the first connection point 81. The third bypass branch Y4 comprises a cooler 66 intended to be traversed by the internal air flow 400 destined for the passenger compartment. This cooler 66 is in particular integrated within a heating, ventilation and air conditioning device D, preferably upstream of the second heat exchanger 65 in the direction of circulation of the internal air flow.

In order to control the second refrigerant fluid, the second heat transfer fluid circuit Y may comprise three-way valves arranged respectively:
- on the sixth connection point 86 to redirect the second heat transfer fluid from the first heat exchanger 62 or from the cooler 66 to the tri-fluid heat exchanger 1,
- on the fifth connection point 85 to redirect the second heat transfer fluid from the tri-fluid heat exchanger 1 to the cooler 66 or to the second connection point 82.
Other means of redirection such as shut-off valves can also be envisaged. The means for redirecting the second heat-transfer fluid from the fifth 85 and sixth 86 connection points may in particular be arranged within the first module M1.

According to this first variant, the first heat transfer fluid circuit X may also comprise a desiccant bottle 44 placed downstream of the first heat exchanger 42. This desiccant bottle 44 can in particular be attached to the first heat transfer fluid outlet of the first heat exchanger 42 This desiccant bottle 44 is thus integrated into the first module M1.

According to a second variant of the first embodiment illustrated in , the second heat transfer fluid circuit Y does not include a third bypass branch Y4 with a cooler 66. In this second variant, the first heat transfer fluid circuit X includes a first branch X2 branch connected to the main loop X1 in parallel with the first expansion device 43 and the three-fluid heat exchanger 1. This first bypass branch X1 of the first heat transfer fluid circuit X, more particularly connects a first connection point 91 to a second connection point 92. The first connection point 91 is arranged on the main loop X1 upstream of the first expansion device 43, between the first heat exchanger 42 of the first heat transfer fluid circuit X and said first expansion device 43. The second connection point 92 is as placed on the main loop X1 downstream of the three-fluid heat exchanger 1, between said three-fluid heat exchanger 1 and the compressor 41. This first bypass branch X2 comprises a second expansion device 45 and a evaporator 46 intended to be traversed by an internal air flow 400 destined for the passenger compartment. This evaporator 46 as well as the second expansion device 45 are integrated within a heating, ventilation and air conditioning device D. Preferably, the evaporator 46 is arranged upstream of the second heat exchanger 65 in the direction of circulation of the internal air flow 400.

In order to control the first heat transfer fluid and whether or not to allow it to pass through the first bypass branch X2, the first 43 and second 45 expansion devices may be electronic expansion valves having a stop function. Other means of redirection such as shut-off valves or three-way valves can also be considered.

According to this second variant, the first heat-transfer fluid circuit X can also comprise an accumulator 44′ placed upstream of the compressor 41. This accumulator 44′ can in particular be placed more specifically downstream of the second connection point 92. This accumulator 44′ is thus integrated into the first module M1.

According to this first embodiment, the second module M2 can be arranged side by side of the first module M1 within the modular platform A, as illustrated in the . According to a variant, illustrated in particular in , the second module M2 is remote from the first module M1. The second module M2 can then be intended to be placed outside the modular platform A between the connection interface I and the heating, ventilation and air conditioning device D, for example within a passenger compartment mounted on the modular platform A.

There shows a thermal management device according to a second embodiment. In this second embodiment, the first heat exchanger 42 'of the first heat transfer fluid circuit X is intended to be crossed by the external air flow 500. The first heat exchanger 62 of the second heat transfer fluid circuit Y is as to it a heat exchange interface with an electric power train of the motor vehicle. By electric power train of the motor vehicle is meant more precisely the electric power as well as the electric motor or motors of the motor vehicle. The second module M2 here comprises a single pump, the first pump 61, and is preferably arranged side by side with the first module M1 within the modular platform A.

In this second embodiment, the first heat transfer fluid circuit X is reversible. It thus comprises an internal condenser 47 and a third expansion device 48 arranged upstream of the first heat exchanger 42. The internal condenser 47 is arranged within the heating, ventilation and air conditioning device D. The third expansion device 48 can in turn be arranged in the cooling module C. By reversible, it is meant more particularly that the first heat transfer fluid circuit X is configured to operate in at least one cooling mode and one heat pump mode.

The first heat transfer fluid circuit X may also comprise a first bypass branch X2 connected to the main loop X1 in parallel with the first expansion device 43 and the three-fluid heat exchanger 1. This first bypass branch X1 of the first heat transfer fluid circuit X, more particularly connects a first connection point 91 to a second connection point 92. The first connection point 91 is arranged on the main loop X1 upstream of the first expansion device 43, between the first heat exchanger heat 42 of the first heat transfer fluid circuit X and said first expansion device 43. The second connection point 92 is for its part arranged on the main loop X1 downstream of the tri-fluid heat exchanger 1, between said heat exchanger tri-fluid heat 1 and the compressor 41. This first bypass branch X2 comprises a second expansion device 45 and an evaporator 46 intended to be crossed by an internal air flow 400 intended for the passenger compartment This evaporator 46 as well as the second expansion device 45 are integrated within the heating, ventilation and air conditioning device D. Preferably, the evaporator 46 is arranged upstream of the internal condenser 47 in the direction of circulation of the internal air flow 400 .

When the internal condenser 47 is intended to be crossed by the internal air flow 400, as in the example of the , we speak of a direct heat pump. The internal condenser 47 directly heats the internal air flow 400. It is however quite possible to imagine a case (not shown) in which the internal condenser 47 is not crossed directly by the internal air flow 400 but connected to an additional thermal management circuit to exchange with another heat transfer fluid. This additional thermal management circuit comprising a heat exchanger intended to be traversed by the internal air flow 400. This is then referred to as an indirect heat pump. Internal condenser 47 indirectly heats internal airflow 400.

According to the example shown in , the internal condenser 47 is more particularly arranged on the main branch X1 of the first heat transfer fluid circuit X downstream of the compressor 41, between said compressor 41 and the third expansion device 48. The first heat transfer fluid circuit X further comprises a second X3 and a third bypass branch X4.

The second bypass branch X3 is connected to the main loop X1 so as to connect the first coolant fluid outlet of the first heat exchanger 42 to the first coolant fluid inlet of the compressor 41. More particularly, this second bypass branch connects a third connection point 93 to a fourth connection point 94. The third connection point is arranged on the main loop X1 downstream of the first heat exchanger 42, between said first heat exchanger 42 and the first expansion device 43. The fourth connection point 94 is arranged on the main loop X1 upstream of the compressor 41, between the second connection point 92 and said compressor 41. This second bypass branch X3 may in particular comprise a first shut-off valve 51 for whether or not to allow the first heat transfer fluid coming from the first heat exchanger 42 to pass through it.

The third bypass branch X4 is connected to the main loop X1 so as to bypass the third expansion device 48 and the first heat exchanger 42 More precisely, the third bypass branch X4 connects a fifth connection point 95 to a sixth point connection 96. The fifth connection point 95 is arranged on the main branch X1 upstream of the third expansion device 48, between the internal condenser 47 and said third expansion device 48. The sixth connection point 96 is arranged on the main loop X1 downstream of the third connection point 93, between the third connection point 93 and the first connection point 91. first heat transfer fluid from the internal condenser 47 to cross it.

The first heat transfer fluid circuit X may also include a non-return valve 53 arranged on the main branch X1 between the third connection point 93 and the sixth connection point 96 so as to prevent the reflux of first heat transfer fluid from the third branch branch X4 to the first heat exchanger 42 or to the second branch branch X3.

The first 51 and second shut-off valves 52 as well as the non-return valve 53 are more particularly devices for managing the flow of the first heat transfer fluid. The expansion valve 48 as well as these management devices can in particular be grouped together within the same hydraulic block for the circulation and management of the first heat transfer fluid. This hydraulic management block thus groups together various functions for managing the flow of the first heat transfer fluid and can be arranged for example on a side of the cooling module C.

The first heat transfer fluid circuit X may also comprise a fourth pressure-balancing expansion device 48 disposed on the first bypass branch X2 downstream of the evaporator 46. This fourth expansion device 49 may in particular be disposed within the heating, ventilation and air conditioning system D.

Still according to the second embodiment of the , the first heat-transfer fluid circuit X may also comprise an accumulator 44′ placed upstream of the compressor 41. This accumulator 44′ can in particular be placed more specifically downstream of the second connection point 92. This accumulator 44′ can in particular be placed more specifically downstream of the second connection point 92. This accumulator 44' is thus integrated into the first module M1.

Whether in the variants of the first embodiment or in the second embodiment, the thermal management device can also comprise an electric radiator 67 placed in the internal air flow 400 intended for the passenger compartment to help its heating. This electric radiator 67 can be integrated within the heating, ventilation and air conditioning device D, preferably the furthest downstream in the direction of circulation of the internal air flow with respect to the other heat exchangers of said heating device , ventilation and air conditioning D.

Figures 8 and 9 show another embodiment in which the heat exchange interface BAT is for example a cold plate connected to the second heat transfer fluid circuit X. More specifically, the heat exchange interface BAT is arranged at the within a fourth bypass branch Y5 of the second heat transfer fluid circuit Y connected in parallel with the first heat exchanger 62 of the second heat transfer fluid circuit Y. The multi-fluid heat exchanger 1 is therefore no longer tri- fluid but simply bi-fluid.

In the example of the , which is a variant of , the fourth bypass branch Y5 connects a seventh connection point 87 to an eighth connection point 88. The seventh connection point 87 is arranged downstream of the multi-fluid heat exchanger 1, here merged with the fifth connection point connection 85. The eighth connection point 88 is arranged downstream of the first heat exchanger 62, here on the third bypass branch Y4, downstream of the cooler 66. The flow of second heat transfer fluid is redirected or not towards the fourth bypass branch Y5 by means of redirection, here a four-way valve arranged on the fifth 85 and seventh 87 connection points. Other redirection means can quite well be used, such as for example a set of shut-off valves. This redirection means can in particular be integrated within the first module M1.

In the example of the , which is a variant of , the fourth bypass branch Y5 connects a seventh connection point 87 to an eighth connection point 88. The seventh connection point 87 is arranged downstream of the first pump 61, between said first pump and the first heat exchanger 62. The eighth connection point 88 is for its part arranged downstream of the first heat exchanger 62, between the first heat exchanger 62 and the multi-fluid heat exchanger 1. The flow of second heat transfer fluid is redirected or not towards the fourth bypass branch Y5 by means of redirection, here a three-way valve arranged on the seventh 87 connection point. Other redirection means can quite well be used, such as for example a set of shut-off valves. This redirection means can in particular be integrated within the second module M2.

Thus, it is clear that the use of a first module M1, a second module M2 as well as a cooling module C and a heating, ventilation and air conditioning device D makes it possible to have a compact thermal management device that can be easily integrated within the modular platform A. In addition, the integration of several components of the first heat transfer fluid circuit X within the first module M1, and the integration of other components of the second heat transfer fluid circuit Y within the second module M2, facilitates the installation of the thermal management device within the modular platform. Indeed, these modules M1, M2 as well as the cooling module C can be installed and directly connected to each other to form at least in part the thermal management device.

Claims (13)

Thermal management device for a modular platform (A) of an electric motor vehicle chassis, said modular platform (A) comprising the batteries (B) as well as the electric power train of the electric motor vehicle, characterized in that the thermal management includes:
- a first module (M1), comprising a compressor (41), a first expansion device (43) and a multi-fluid heat exchanger (1) of a first heat transfer fluid circuit (X) within which is intended a first heat transfer fluid, said first module (M1) being intended to be integrated within the modular platform (A),
- a cooling module (C) comprising at least a first heat exchanger (62, 42') intended to be traversed by the external air flow (500), said cooling module (C) being intended to be integrated into the within the modular platform (A),
- a heating, ventilation and air conditioning device (D) intended to be traversed by an internal air flow (400) intended for a passenger compartment, said heating, ventilation and air conditioning device (D) comprising a cooler (66, 46), intended to cool the internal air flow (400), a second heat exchanger (65, 47), intended to heat the internal air flow (400), and a means of ventilation (D1) configured to generate said internal airflow (400),
- a second module (M2) comprising at least a first pump (61) of a second heat transfer fluid circuit (Y) within which a second heat transfer fluid is intended, and
- a heat exchange interface (BAT) with the batteries (B),
the various modules (M1, M2), the cooling module (C), the heating, ventilation and air conditioning device (D) and the heat exchange interface (BAT) with the batteries (B) being connected each other so as to form interconnected heat transfer fluid circuits (X, YZ). Thermal management device according to the preceding claim, characterized in that the heating, ventilation and air conditioning device (D) is intended to be arranged outside the modular platform (A), said thermal management device comprising an interface connection (I) intended to allow the fluidic connection of the heating, ventilation and air conditioning device (D) to the first (X) and/or second (Y) heat transfer fluid circuit. Thermal management device according to any one of Claims 1 to 2, characterized in that the first module (M1) further comprises a first heat exchanger (42) acting as a condenser for the first heat transfer fluid circuit (X) ,
the first heat exchanger (62) of the cooling module (C) being a first heat exchanger (62) of the second heat transfer fluid circuit (Y),
the second module M2 comprising a second pump (63) of the second heat transfer fluid circuit (Y) supplying the first heat exchanger (42) of the first module (M1) acting as a condenser of the first heat transfer fluid circuit (X). Thermal management device according to Claim 3, characterized in that the second module (M2) is arranged side by side of the first module (M1), the said first module (M1) and second module (M2) being intended to be arranged within of the modular platform (A). Thermal management device according to Claim 3, characterized in that the second module (M2) is offset with respect to the first module (M1), the said second module (M2) being intended to be arranged outside the modular platform (A) between the connection interface (I) and the heating, ventilation and air conditioning device (D). Thermal management device according to any one of Claims 3 to 5, characterized in that the cooler (66) of the heating, ventilation and air conditioning device (D) is a cooler (66) of the second heat transfer fluid circuit (Y). Thermal management device according to any one of Claims 3 to 5, characterized in that the cooler (46) of the heating, ventilation and air conditioning device (D) is an evaporator (46) of the first heat transfer fluid circuit (X). Thermal management device according to any one of Claims 3 to 7, characterized in that the second heat exchanger (65) of the heating, ventilation and air conditioning device (D) is a second heat exchanger (65) of the second heat transfer fluid circuit (Y). Thermal management device according to any one of Claims 1 or 2, characterized in that the first heat exchanger (42') of the cooling module (C) is a first heat exchanger (42') of the first fluid circuit coolant (Y). Thermal management device according to Claim 9, characterized in that the second module (M2) is arranged side by side of the first module (M1), the said first module (M1) and second module (M2) being intended to be arranged within of the modular platform (A). Thermal management device according to any one of Claims 9 or 10, characterized in that the second heat exchanger (47) of the heating, ventilation and air conditioning device (D) is an internal condenser (45) of the first heat transfer fluid circuit (X). Thermal management device according to any one of Claims 9 to 11, characterized in that the first heat transfer fluid circuit (X) comprises an expansion valve (48) arranged upstream of the first heat exchanger (42') of the cooling module (C) as well as devices for managing the flow of the first heat transfer fluid, said expansion valve (48) as well as said management devices being grouped together within the same first fluid circulation and management block coolant. Modular platform (A) of an electric motor vehicle chassis, said modular platform (A) comprising the batteries (B) as well as the electric power train of the electric motor vehicle, characterized in that said modular platform (A) comprises a thermal management device according to any one of claims 1 to 12.