WO2023083639A1

WO2023083639A1 - Cooling module for a motor vehicle, with a drainage system

Info

Publication number: WO2023083639A1
Application number: PCT/EP2022/080304
Authority: WO
Inventors: Moussa Nacer Bey; Amrid MAMMERI; Kamel Azzouz
Original assignee: Valeo Systemes Thermiques
Priority date: 2021-11-09
Filing date: 2022-10-28
Publication date: 2023-05-19
Also published as: FR3128901A1

Abstract

Cooling module (22) for a motor vehicle (10) comprising a cowling (40) forming an internal channel in a longitudinal direction (X) inside which is arranged a heat exchanger (24, 26, 28) through which an airflow (F) is intended to pass, the cooling module also comprising a manifold (41) arranged downstream of the cowling (40) in the longitudinal direction (X), the manifold (41) being configured to accommodate a tangential turbomachine (30) which is configured to produce an airflow (F), the cooling module being characterized in that the cowling (40) further comprises a collecting receptacle (50) with a discharge opening (O), the collecting receptacle (50) being configured to collect a liquid and being arranged on a bottom wall (402) of the cowling (40).

Description

MOTOR VEHICLE COOLING MODULE WITH A DRAINAGE SYSTEM

[1]The present invention relates to a cooling module for an electric or hybrid motor vehicle. Such a cooling module of a motor vehicle conventionally comprises at least one thermal heat exchanger intended to be traversed by a flow of air. This type of cooling module is for example installed at the front face of the motor vehicle.

[2] Conventionally, the heat exchanger(s) are then placed opposite a cooling bay which is for example formed in the front face of the motor vehicle body and generally protected by a grille. The outside air then infiltrates through the grille and inside the cooling module where it passes through the heat exchanger(s) to carry out the heat exchange. The heat exchanger(s) are for example connected to a cooling circuit such as an air conditioning circuit able to cool the batteries and/or to cool an internal air flow intended for the passenger compartment of the motor vehicle. The cooling circuit can also be configured to operate in heat pump mode.

[3]To ensure good performance of heat exchangers, the perimeter of said exchangers is generally sealed to prevent air leaks. However, it sometimes happens that water enters the cooling module, for example when frost forms on the surface of the heat exchanger(s) and this frost melts, following a defrosting operation in particular. Indeed, one of the drawbacks of such a device configured to operate in heat pump mode is the formation of frost on the surface of the heat exchanger(s).

[4] The formation of frost occurs more particularly when a heat exchanger of such a cooling module is at a lower temperature than that of the outside air, for example when the latter acts as an evaporator during operation in heat pump mode. Thus, when the outside temperature approaches or drops below 0°C, the temperature of the heat exchanger also drops below 0°C, thus favoring the formation of frost on its surface, in particular in the case where the air humidity is relatively high. The water present in the ambient air then condenses on the surface of the heat exchanger and turns into frost. After a defrost (natural or caused by an operation within the cooling module), liquid water from frost can be trapped inside the cooling module, which can affect its efficiency.

[5] The object of the present invention is therefore to at least partially remedy the drawbacks of the prior art and to propose an improved cooling module which makes it possible to evacuate as soon as possible the water trapped within the module after a defrost.

[6] The present invention therefore relates to a cooling module for an electric or hybrid motor vehicle, said cooling module being intended to be traversed by a flow of air and comprising a fairing forming an internal channel in a longitudinal direction of the cooling module , the internal channel extending between an upstream end and a downstream end opposite to each other and inside which is arranged at least one heat exchanger intended to be traversed by the flow of air, the module cooling module also comprising a manifold disposed downstream of the fairing in the longitudinal direction, said manifold being configured to receive a tangential turbomachine itself configured to generate the air flow, the cooling module being characterized in that the fairing comprises in addition to a collecting receptacle with an evacuation orifice, the collecting receptacle being configured to collect a liquid and being arranged at the level of a bottom wall of the fairing.

[7]The collector receptacle placed at the foot of all the heat exchangers grouped together inside the fairing of the cooling module makes it possible to effectively collect the water and in this case the molten frost which flows along the faces of said heat exchangers and to evacuate this water rapidly outside the module via the at least one discharge orifice of the collecting receptacle. The collector receptacle thus avoids having water stagnate in the module, thus limiting any complications that the presence of liquid water within said cooling module may cause.

[8] The invention may further comprise one or more of the following aspects taken alone or in combination:

[9]- the manifold receptacle is integral with the cooling module fairing;

[10] - the at least one discharge orifice of the collector receptacle is equipped with a valve configured to release or block the passage through said discharge orifice;

[11]- the collector receptacle has at least one wall converging towards the discharge orifice; [12] - the collector receptacle has a flat flow wall inclined towards the discharge orifice;

[13]- the discharge orifice of said collector receptacle is arranged at the lower edge of said flat and inclined flow wall;

[14]- the evacuation hole is located in the central part of the collecting receptacle;

[15]- the collector receptacle has two drain holes configured to drain the liquid out of the cooling module;

[16]- the first discharge orifice and the second discharge orifice of the collector receptacle are aligned in the longitudinal direction of the cooling module;

[17]- the heat exchanger inside the inner channel of the fairing is inclined at an angle to a plane perpendicular to the longitudinal direction in such a way that its edge closest to the collector receptacle is also closer from the upstream end of the fairing than from the downstream end; And

[18]- the angle of inclination of the heat exchanger with respect to the plane perpendicular to the longitudinal direction is between 9° and 30°.

[19] 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:

[20] [Fig 1] Figure 1 shows a schematic representation of the front of a motor vehicle in side view,

[21] [Fig 2] figure 2 shows a schematic representation in perspective and in partial section of the front of a motor vehicle and of a cooling module according to a first embodiment,

[22][Fig 3a] Figure 3a shows a schematic sectional representation of a first embodiment of the collector receptacle of the cooling module of Figure 2;

[23] [Fig 3b] Figure 3b shows a schematic sectional representation of the fairing seen from the front with the collector receptacle of Figure 3a;

[24] [Fig 4a] Figure 4a shows a schematic sectional representation of the collector receptacle according to a second embodiment;

[25] [Fig 4b] Figure 4b shows a schematic sectional representation of the fairing seen from the front with the collector receptacle of Figure 4a;

[26] [Fig 5a] Figure 5a shows a schematic sectional representation of the collecting receptacle according to a third embodiment; [27] [Fig 5b] Figure 5b shows a schematic sectional representation of the cooling module with the collector receptacle of Figure 5a;

[28] [Fig 6] Figure 6 shows a schematic sectional representation of a cooling module according to a second embodiment; And

[29] [Fig 7] Figure 7 shows a schematic sectional representation of a cooling module according to a third embodiment.

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

[31]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.

[32] 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 even 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.

[33]All the figures show an XYZ trihedron in order to define the orientation of the different elements from each other. A first direction, denoted X, corresponds to a longitudinal direction of the vehicle. It also corresponds to a direction opposite to the direction of travel of the vehicle. A second direction, denoted Y, is a lateral or transverse direction. Finally, a third direction, denoted Z, is vertical. The directions, X, Y, Z are orthogonal two by two.

[34] Figure 1 schematically illustrates the front part of an electric or hybrid motor vehicle 10 which may include an electric or hybrid motor 12. The vehicle 10 comprises in particular a body 14 and a bumper 16 carried by a chassis (not shown) of the motor vehicle 10. A cooling module 22 is arranged below the bumper 16 and opposite the base 100 of the motor vehicle 10. Optionally, the bodywork 14 can define a cooling bay 18, that is to say an opening through the bodywork 14. This cooling bay 18 is preferably located opposite the cooling module 22. A grille 20 can possibly protect this cooling module 22.

[35] As shown in Figures 2, 5b, 6 and 7, the cooling module 22 is intended to be traversed by an air flow F parallel to the direction X going from the front to the rear of the vehicle 10 The direction X corresponds more particularly to the longitudinal axis of the cooling module 22 and the flow of air F circulates from an air inlet 22a to an air outlet 22b. In the present application, an element is referred to as "upstream" or "downstream" according to the longitudinal direction X of the cooling module 22, an element which is respectively disposed further forward or rearward than another item. The front corresponds to the front of the motor vehicle 10 in the assembled state or else the face of the cooling module 22 through which the air flow F is intended to enter the cooling module 22. to him at the rear of the motor vehicle 10 or else to the face of the cooling module 22 through which the air flow F is intended to come out of the cooling module 22.

[36]Similarly, the term "upper" and "lower" means an orientation in the direction Z. A so-called upper element will be closer to the roof of the vehicle 10 and a so-called lower element will be closer to the ground.

[37] The cooling module 22 essentially comprises a fairing 40 forming an internal duct between an upstream end 40a and a downstream end 40b opposite each other. According to the embodiments of the cooling module 22 illustrated in FIGS. 2, 3b, 4b, 5b, 6 and 7, the fairing 40 forming the internal duct comprises four junction walls, including two side walls 400 arranged opposite each other. screws from each other, an upper wall 401 and a lower wall 402. The lower wall will be called

"bottom wall 402" in the following description. The internal duct is preferably oriented parallel to the direction X so that the upstream end 40a is oriented towards the front of the vehicle 10 opposite the cooling bay 18 and so that the downstream end 40b is oriented towards the rear of the vehicle 10.

[38] Inside said fairing 40 is arranged at least one heat exchanger 24, 26, 28. In Figures 2, 5b, 6 and 7, the cooling module 22 comprises three heat exchangers 24, 26, 28 However, it could include more or less depending on the desired configuration. [39] A first heat exchanger 24 can for example be configured to release heat energy from the air flow F. This heat exchanger 24 can more particularly be connected to a thermal management circuit capable of operating in pump mode in heat.

[40] A second heat exchanger 26 can also be configured to release heat energy into the air flow F. This second heat exchanger 26 can more particularly be a radiator connected to a thermal management circuit (not shown ) of electrical elements such as the electric motor 12.

[41]The third heat exchanger 28 can also be configured to release heat energy into the airflow. This third heat exchanger 28 may more particularly be a radiator connected to a thermal management circuit (not shown), which may be separate from that connected to the second heat exchanger 26, for electrical elements such as power electronics. It is also quite possible to imagine that the second 26 and the third 28 heat exchangers are connected to the same thermal management circuit, for example connected in parallel to each other.

[42] Still according to the example illustrated in Figures 2, 5b, 6 and 7, the second heat exchanger 26 is arranged downstream of the first heat exchanger 24 while the third heat exchanger 28 is arranged upstream of the first heat exchanger 24. Other configurations can nevertheless be envisaged, such as for example the second 26 and third 28 heat exchangers both arranged downstream or upstream of the first heat exchanger 24.

[43] In the embodiments illustrated in Figures 2 and 5b, each of the heat exchangers 24, 26, 28 has a generally parallelepipedal shape determined by a length, a thickness and a height. The length extends along the Y direction, the thickness along the X direction and the height in the Z direction. In these figures, the heat exchangers 24, 26, 28 then extend along a general plane parallel to that generated by the vertical axis Z and the lateral axis Y. This general plane is thus perpendicular to the longitudinal direction X of the cooling module 22, the heat exchangers 24, 26, 28 are therefore perpendicular to the flow of air F intended to cross them.

[44] Despite the tightness of the cooling module 22 provided in particular by the fairing 40, frost can form on the surface of the heat exchangers 24, 26, 28 arranged inside the internal channel formed by the fairing 40. In case this frost is caused to melt, water is then trapped in the internal duct extending between the upstream end 40a and the downstream end 40b of the fairing 40.

[45] Indeed, under the effect of its weight, the liquid formed by the melted frost after a defrosting operation can flow along the surface of the heat exchangers 24, 26, 28 on which it has melted. form. This liquid can then accumulate at the bottom of the cooling module 22, in particular at the level of the bottom wall 402 of the fairing 40 which is oriented towards the base 100 of the motor vehicle 10. The liquid accumulated at this location then risks, depending on the parameters of the external environment, to frost again, which can damage the heat exchangers 24, 26, 28 or the shroud 40 due to its expansion during freezing. It can also clog part of the surface of the heat exchangers and thus reduce their efficiency.

[46] In order to remedy this unpleasant situation, the shroud 40 further comprises a collection receptacle 50 which is configured to collect the molten frost which flows along the faces of the at least one heat exchanger 24, 26, 28. This collector receptacle 50 is arranged at the level of the bottom wall 402 of the fairing 40, for example so as to at least partially form said bottom wall 402. This bottom wall 402 of the fairing 40 more particularly oriented towards the underbody 100 of the vehicle automobile 10.

[47]Thus, according to a specific embodiment of the collector receptacle 50, the latter comes in one piece with the fairing 40 of the cooling module 22. This specific embodiment makes it possible to limit the use of seals or any other element arranged on the junction edges intended to come into contact with the fairing 40 to prevent the penetration of polluting elements within the cooling module 22.

[48] According to another embodiment of the collector receptacle 50, this may be an added part which is for example removably fixed to the bottom wall 402 of the fairing 40 so as to be oriented towards the underbody 100 of the vehicle automobile 10. Such an attached and removable part can facilitate maintenance operations and/or make it possible to easily replace the collector receptacle 50 if necessary.

[49] With a view to evacuating the liquid accumulated within the collector receptacle 50, the latter further comprises at least one evacuation orifice O configured to evacuate said liquid outside the cooling module 22. The at least an evacuation orifice O may be connected to a channel 54 which opens in particular at the level of the base 100 of the motor vehicle 10. This channel 54 may comprise a vertical portion extending in the direction Z. In FIGS. 2 and 4b, the orifice O evacuation is for example placed below the heat exchanger 24 which occupies the central place in the set of heat exchangers 24, 26, 28 inside the internal conduit of the fairing 40.

[50] The at least one discharge orifice O of the collector receptacle 50 can be equipped with a valve 52 configured to free or close the passage through said discharge orifice O, as illustrated in particular in Figures 2, 3b, 4b, 6 and 7. This valve 52 can be mechanical, in which case it opens in particular when the pressure exerted by the liquid collected within the collector receptacle 50 exceeds a predetermined threshold value and it closes when the accumulated water is evacuated outside the cooling module 22.

[51] Alternatively, the valve 52 can be controlled electronically, in which case the opening is then triggered by a control unit (not shown in the drawings) of the cooling module 22. Such a valve 52 also avoids potential intrusions of polluting elements inside the cooling module 22 via the at least one discharge orifice O of the collector receptacle 50.

[52] According to a first embodiment of the collecting receptacle 50 illustrated in FIG. 3a, the collecting receptacle 50 has a converging flow wall towards the evacuation orifice O. This wall is inclined at an angle α with respect to the bottom wall 402 which extends globally in a plane parallel to that generated by the X and Y axes. The angle α can be between 5 and 45 degrees. Such a geometry of the collector receptacle 50 makes it possible to best exploit the dead volume H at the foot of the heat exchangers 24, 26, 28 arranged in the internal duct of the fairing 40.

[53] The discharge orifice O of the collector receptacle 50 is then arranged at the lower edge of said flow wall converging towards the discharge orifice O. The evacuation orifice O can for example be located close to one of the two side walls 400 of the fairing 40, as illustrated in FIG. 3b. But according to a non-illustrated variant of this first embodiment, the evacuation orifice O can be located, for example, at an equal distance from the two side walls 400 of the fairing 40.

[54] According to a second embodiment of the collecting receptacle 50 illustrated in FIG. 4a, the latter may have several walls converging towards the discharge orifice O. In this second embodiment of the collecting receptacle 50, the latter therefore has several walls inclined with an angle α. The shape of the collecting receptacle can then resemble that of a funnel. Such a geometry of the collector receptacle 50 facilitates the flow of the liquid towards the discharge orifice O. In this second mode of particular embodiment, the evacuation orifice O may in particular be located in the central part of the collector receptacle 50. In this case, the evacuation orifice O is located, for example, halfway the width of the fairing 40 of the module cooling 22 along the Y axis and halfway the length of the fairing 40 along the X axis, so that it is at an equal distance from the two side walls 400 of the fairing 40, this is particularly illustrated in Figure 4b. In this figure 4b, the evacuation orifice O is located in particular below the heat exchanger 24.

[55] A collector receptacle 50 can possibly be envisaged with several walls converging towards the evacuation orifice O for which the angles of the slopes are different from one wall to another. This makes it possible to place the evacuation orifice O in a strategic location to gain in compactness. This variant is not illustrated in the figures.

[56] According to a third embodiment of the collecting receptacle 50 illustrated in FIG. 5a, the collecting receptacle 50 can comprise two evacuation orifices 01 and 02 which are configured to evacuate the liquid outside the cooling module 22. Thus , in the event that one of the two evacuation orifices 01 or 02 is blocked, the other evacuation orifice 01 or 02 makes it possible to continue to evacuate at least part of the liquid collected in the collecting receptacle 50 outside of the cooling module 22. These two evacuation orifices 01 and 02 can for example be aligned along the longitudinal direction X so that one of the evacuation orifices 01, 02 is arranged at the level of the space between the second heat exchanger 26 and the first heat exchanger 24 while the other orifice is below the space between the first heat exchanger 24 and the third heat exchanger 28. This configuration is more particularly illustrated in Figure 5b .

[57] In this third embodiment of the collector receptacle 50, the two evacuation orifices 01 and 02 can be located such that they are each at an equal distance from the two side walls 400 of the fairing 40, or else they may be located, for example, close to one of the two side walls 400 of the fairing 40. These suggested locations for the evacuation orifices 01 and 02 are not illustrated in the figures.

[58] According to a second embodiment of the cooling module 22 illustrated in Figure 6, the heat exchanger 24 which plays the role of the evaporator in heat pump mode inside the internal conduit of the fairing 40 is inclined at an angle P with respect to a plane perpendicular to the longitudinal direction X such that its lower edge 241 is closer to the upstream end 40a of the fairing 40 than to the downstream end 40b. Such an inclination of the heat exchanger 24 makes it possible to optimize the flow of the molten frost along the walls of the said exchanger 24.

[59] In a third embodiment of the cooling module 22 illustrated in Figure 7, all the heat exchangers 24, 26, 28 are inclined at an angle p. More specifically, the respective lower edges of the heat exchangers 24, 26, 28 are closer to the front face of the motor vehicle 10 while the respective upper edges of said exchangers 24, 26, 28 are farther from this same front face. The surfaces of the heat exchangers 24, 26, 28 on which the frost forms are therefore not oriented along a vertical plane.

[60] The angle of inclination P of at least one heat exchanger 24, 26, 28 can be between 9° and 30°. Such an angle of inclination makes it possible to drain the molten frost towards the collecting receptacle 50, thus accelerating the collection of the liquid without thereby significantly impairing the heat exchange for which the heat exchangers 24, 26, 28 are configured and without excessively lengthening the inner fairing duct 40.

[61] The cooling module 22 also comprises a manifold 41 disposed downstream of the shroud 40 and heat exchangers 24, 26, 28. More specifically, the manifold 41 is juxtaposed at the downstream end 40b of the shroud 40, it is therefore aligned with the fairing 40 along the longitudinal axis X of the cooling module 22. This collector 41 comprises the air outlet 22b intended to discharge the flow of air F. The collector 41 thus makes it possible to recover the flow of air F passing through the heat exchangers 24, 26, 28 and directing this air flow F towards the air outlet 22b, this is particularly illustrated by the arrows representing the air flow F in FIG. 2. The collector 41 can be integral with the fairing 40 or else be an added part fixed to the downstream end 40b of said fairing 40.

[62] The cooling module 22, more precisely the manifold 41, also comprises at least one tangential fan, also called tangential turbomachine 30 configured so as to generate the air flow F passing through the set of heat exchangers 23. The tangential turbomachine 30 comprises a rotor or turbine 32 (or tangential propeller). The turbine 32 has a substantially cylindrical shape. The turbine 32 advantageously comprises several stages of blades (or vanes), visible in FIG. 2. The turbine 32 is rotatably mounted around an axis of rotation A, for example parallel to the direction Y. The diameter of the turbine 32 is for example between 35 mm and 200 mm to limit its size. The tangential turbomachine 30 is thus compact. [63] The tangential turbomachine 30 is arranged in the manifold 41. The tangential turbomachine 30 is then configured to suck in air in order to generate the air flow F passing through the set of heat exchangers 23. The tangential turbomachine 30 more specifically comprises a volute 44, formed by the first collector 41 and at the center of which is arranged the turbine 32. The volute 44 at least partially delimits the air outlet 22b of the air flow. In other words, the air outlet of the volute 44 corresponds to the air outlet 22b of the air flow F of the first collector 4L

[64] In the example illustrated in all of Figures 2, 5b, 6 and 7, the tangential turbomachine 30 is in a high position, in particular in the upper third of the manifold 41, preferably in the upper quarter of the manifold 4L This makes it possible in particular to protect the tangential turbomachine 30 in the event of submersion and/or to limit the size of the cooling module 22 in its lower part. In this case, the air outlet 22b of the air flow F is preferably oriented towards the lower part of the cooling module 22.

[65] It is nevertheless possible to imagine that the tangential turbomachine 30 is in a low position, in particular in the lower third of the collector 4L This would limit the size of the cooling module 22 in its upper part. In this case, the air outlet 22b of the air flow will preferably be oriented towards the upper part of the cooling module 22. Alternatively, the tangential turbomachine 30 can be in a middle position, in particular in the middle third of the height of the first collector 41, for example for reasons of integration of the cooling module 22 in its environment. These alternatives are not illustrated.

[66] The invention is not limited to the embodiments described with reference to the figures and other embodiments will appear clearly to those skilled in the art. In particular, the different examples can be combined, as long as they are not contradictory.

Claims

[Claim 1] Cooling module (22) for an electric or hybrid motor vehicle (10), said cooling module (22) being intended to be traversed by a flow of air (F) and comprising a fairing (40) forming a internal channel along a longitudinal direction (X) of the cooling module (22), the internal channel extending between an upstream end (40a) and a downstream end (40b) opposite each other and inside which is arranged at least one heat exchanger (24, 26, 28) intended to be traversed by the flow of air (F), the cooling module also comprising a collar (41) arranged downstream of the fairing (40) following the longitudinal direction (X), said manifold (41) being configured to receive a tangential turbomachine (30) itself configured to generate the air flow (F), the cooling module being characterized in that the fairing (40 ) further comprises a collection receptacle (50) with an evacuation orifice (O), the collection receptacle (50) being configured to collect a liquid and being disposed at the level of a bottom wall (402) of the fairing (40 ).

[Claim 2] Cooling module (22) according to the preceding claim, characterized in that the collector receptacle (50) is integral with the fairing (40) of the cooling module (22).

[Claim 3] Cooling module (22) according to any one of the preceding claims, characterized in that the at least one discharge orifice (O) of the collecting receptacle (50) is equipped with a valve (52) configured to release or block the passage through said orifice (O).

[Claim 4] Cooling module (22) according to any one of the preceding claims, characterized in that the collecting receptacle (50) has at least one wall converging towards the discharge orifice (O).

[Claim 5] Cooling module (22) according to any one of the preceding claims, characterized in that the collecting receptacle (50) has a flat flow wall inclined towards the discharge orifice (O) and in that the discharge orifice (O) of said collection receptacle (50) is disposed at the lower edge of said planar and inclined flow wall.

[Claim 6] Cooling module (22) according to any one of Claims 1 to 4, characterized in that the evacuation orifice (O) is located in the central part of the collecting receptacle (50).

[Claim 7] Cooling module (22) according to any one of the preceding claims, characterized in that the collecting receptacle (50) comprises two evacuation orifices (01, 02) configured to evacuate the liquid outside the module cooling (22).

[Claim 8] Cooling module (22) according to the preceding claim, characterized in that the first discharge orifice (01) and the second discharge orifice (02) of the collecting receptacle (50) are aligned in the longitudinal direction (X) of the cooling module (22).

[Claim 9] Cooling module (22) according to any one of the preceding claims, characterized in that the heat exchanger (24) inside the internal channel of the shroud (40) is inclined at an angle ( P) with respect to a plane perpendicular to the longitudinal direction (X) such that its edge closest to the collector receptacle (50) is also closer to the upstream end (40a) of the shroud (40) than to the downstream end (40b).

[Claim 10] Cooling module (22) according to the preceding claim, characterized in that the angle of inclination (P) of the heat exchanger (24) with respect to the plane perpendicular to the longitudinal direction (X) is between 9° and 30°.