Automotive fairing kit

Abstract

The invention relates to a fairing assembly (2) for a motor vehicle. The fairing assembly (2) forms the underbody of the motor vehicle and comprises a battery support, which is generally flat and extends between two longitudinal members of the motor vehicle, and an intermediate floor (14) integral with the battery support. The intermediate floor (14) has a concave profile (15) such as to form a housing for a high-voltage electric battery of the motor vehicle between said intermediate floor (14) and the battery support. According to the invention, the intermediate floor (14) has, at an outer lateral edge (17), a programmed crumple zone (21) configured to compress in the event of a lateral impact and dissipate energy from said lateral impact. Figure to be published with the abbreviation: Fig. 2

Description

Title of the invention: Fairing assembly for motor vehicle

[0001] The technical context of the present invention is that of devices for ensuring passive safety in motor vehicles, more particularly devices for providing protection in the event of side impacts. More specifically, the invention relates to a fairing assembly for a motor vehicle.

[0002] In the prior art, electric motor vehicles are known. In particular, BEVs (Battery Electric Vehicles), equipped with an electric motor, and PHEVs (Plug-in Hybrid Electric Vehicles), equipped with both a combustion engine and an electric motor, are known. These motor vehicles are equipped with a battery pack attached to the vehicle body. To protect the battery pack in the event of a side impact, it is mounted between two longitudinal members of the vehicle at the level of the vehicle floor, by means of a battery pack support plate.

[0003] The drawback of this arrangement is that in the event of a lateral impact, a significant difference in rigidity exists between the floor and the longitudinal beams. Therefore, in the event of an impact, there is a risk of shearing of the floor. In particular, this arrangement offers ineffective lateral protection in the event of a "pole-side impact," that is, a lateral impact against a narrow surface, such as a fixed obstacle in the form of a tree or a pole. Indeed, due to the significant difference in rigidity between the battery pack support plate and the floor, there is a risk of the formation and propagation of oblique creases, which can lead to tearing of the assembly. Damage to the integrity of the battery pack can generate electrical and chemical hazards, and even fires.

[0004] To overcome these drawbacks, electric vehicles with increased floor thickness are known. However, these solutions have the disadvantage of increasing the vehicle's mass, which is detrimental in several respects, particularly from a safety standpoint. Other electric vehicles are equipped with high-performance steel floors, which have the disadvantage of increasing the vehicle's cost, again an undesirable consequence.

[0005] The present invention aims to provide a new set of fairings for motor vehicles in order to address at least largely the previous problems and to lead to other advantages.

[0006] Another objective of the invention is to provide a fairing assembly for motor vehicles that is effective in the event of a side impact to the motor vehicle it equips, known as a "pole side impact".

[0007] Another object of the invention is to provide a fairing assembly for a motor vehicle configured to protect electric batteries of an electric motor vehicle.

[0008] Another object of the invention is to propose a fairing assembly for motor vehicles configured to improve the protection of the electric batteries of an electric motor vehicle compared to existing solutions.

[0009] Another object of the invention is to provide a set of fairings for motor vehicles which improves the behavior of the front seating floor in the event of a side impact to the motor vehicle on which it is fitted, and in particular in the event of a side impact known as a "pole side impact".

[0010] Another object of the invention is to provide a set of fairings for motor vehicles which improves the behavior of the front seat floor in the event of a frontal impact on the motor vehicle on which it is fitted.

[0011] Another objective of the invention is to provide a fairing assembly for motor vehicles without negative impact on the mass of the motor vehicle it equips.

[0012] Another objective of the invention is to provide a set of fairings for motor vehicles without negative economic impact, particularly with regard to the cost price of manufacturing the motor vehicle it equips.

[0013] According to a first aspect of the invention, at least one of the aforementioned objectives is achieved with a fairing assembly for a motor vehicle, the fairing assembly forming a base of the motor vehicle and comprising: (i) a generally flat extension battery support intended to extend between two longitudinal members of the motor vehicle; (ii) an intermediate floor integral with the battery support, the intermediate floor having a concave profile so as to form a housing intended to house a high-voltage electric battery of the motor vehicle between said intermediate floor and the battery support; in which the intermediate floor has, at the level of an external lateral edge, a programmed deformation zone configured to be able to compress in the event of a lateral impact and dissipate energy from said lateral impact.

[0014] In the fairing assembly according to the first aspect of the invention, the battery support is intended to support the high-voltage electric battery of the motor vehicle.

[0015] In the fairing assembly according to the first aspect of the invention, the intermediate floor is fixed securely to the battery support.

[0016] In the fairing assembly according to the first aspect of the invention, the intermediate floor comprises the outer lateral edge. It is understood that the outer lateral edge forms an edge of the floor intended to be located on the side of the nearest longitudinal stringer.

[0017] In the fairing assembly according to the first aspect of the invention, the programmed deformation zone of the intermediate floor forms a portion of the intermediate floor that is designed and configured to absorb the energy of a lateral impact. It is understood that the programmed deformation zone is designed and configured to absorb the energy of a lateral impact by deforming predictably. Typically, the programmed deformation zone is designed and configured to absorb the energy of a lateral impact by deforming predictably through compression. By deforming, the programmed deformation zone thus allows for the absorption of the mechanical energy resulting from the impact. By deforming, the programmed deformation zone helps to preserve a portion of the intermediate floor located in the extension of the programmed deformation zone.

[0018] In the context of the present invention, the longitudinal axis, the transverse axis, and the vertical axis are defined with respect to the motor vehicle on which the fairing assembly conforming to the first aspect of the invention is intended to be mounted. More particularly, the transverse axis is understood as a direction taken between one lateral side of the motor vehicle and an opposite lateral side of said motor vehicle. In other words, the transverse axis is understood as a direction extending from a passenger side of the motor vehicle to a driver's side of said motor vehicle, or vice versa. The adjectives lateral, inside, and outside refer to such a transverse axis. Furthermore, the longitudinal axis is understood as being taken along a direction extending from front to rear or from rear to front of the motor vehicle. The longitudinal axis is perpendicular to the transverse axis.The adjectives front, front, and rear refer to this longitudinal axis. Finally, the vertical axis is understood as being taken along an axis extending from the wheels of the motor vehicle towards the roof of said motor vehicle, or vice versa, the vertical axis being simultaneously perpendicular to the transverse axis and the longitudinal axis. The adjectives above and below, or lower and upper, refer to this vertical axis.

[0019] In the fairing assembly according to the first aspect of the invention, the intermediate floor is located above the battery support, relative to the vertical axis.

[0020] Such a fairing assembly, provided with a programmed deformation zone at the lateral edge of the intermediate floor, makes it possible to preserve the integrity of the Battery support. This solution thus protects the high-voltage electric battery of the motor vehicle, which is mounted on the intermediate floor and supported by the battery support, while remaining simple to implement. The fairing assembly according to the invention has the advantage of overcoming the aforementioned drawbacks without requiring significant modifications to the motor vehicle it equips.

[0021] The fairing assembly conforming to the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements being able to be taken alone or in combination:

[0022] - relative to a transverse axis, the deformation zone extends over a distance between 110 mm and 150 mm from the outer lateral edge. Such a crumple zone protects the motor vehicle equipped with the fairing assembly conforming to the first aspect of the invention in the event of a collision while remaining compact. Such a configuration allows, in the event of a collision to the motor vehicle equipped with the invention, a deformation of the programmed crumple zone that avoids damaging the integrity of the high-voltage electric battery of the motor vehicle;

[0023] - preferably, the deformation zone extends over a distance equal to 130 mm from the outer lateral edge. Such a deformation zone is optimal for securing the motor vehicle equipped with the fairing assembly conforming to the first aspect of the invention in the event of a collision;

[0024] - the deformation zone comprises a plurality of grooves that extend relative to the longitudinal axis. A groove is defined as a deformation zone comprising a plurality of long, narrow, hollow notches. The groove may be formed on either face of the deformation zone. Furthermore, a transverse profile of the groove is hollow, such that the groove bottom is the deepest part of the groove. The plurality of grooves facilitates the deformation of the deformation zone. It is understood that the plurality of grooves forms a preferred compression zone, allowing the deformation dynamics of the deformation zone subjected to impact to be directed.

[0025] - the intermediate floor is formed from a material containing steel. Such intermediate floor, made of steel, has enhanced resistance to mechanical stress;

[0026] - preferably, the intermediate floor is formed of a material comprising a ED390D type steel;

[0027] - the thickness of the intermediate floor is less than 2 mm, preferably equal to 1.3 mm. Such a thickness of the intermediate floor optimizes the mechanical resistance and mass of the intermediate floor;

[0028] - the grooves extend from a rear edge of the intermediate floor towards a front edge of the intermediate floor. Oriented in this way, the grooves are substantially perpendicular to the mechanical forces imposed on the intermediate floor in the event of a side impact to the motor vehicle equipped with the invention;

[0029] - the grooves are regularly spaced relative to each other, relative to the longitudinal axis. Such a distribution allows for sequential absorption of the mechanical forces imposed on the intermediate floor in the event of a lateral impact on the motor vehicle equipped with the invention;

[0030] - the fairing assembly comprises: (i) a first fixed seat cross member fixed to the intermediate floor at its concave profile; (ii) a second seat crossmember fixed to the intermediate floor at a rear edge of said intermediate floor. In the context of the invention, each seat crossmember forms a mounting support for a driver's seat of the motor vehicle;

[0031] - the first seat cross member and / or the second seat cross member comprise a A programmed deformable section is analogous to the programmed deformation zone of the intermediate floor. It is understood that the programmed deformable section is designed and configured to absorb the energy of a lateral impact by deforming predictably. Typically, the programmed deformable section is designed and configured to absorb the energy of a lateral impact by deforming predictably through compression. By deforming, the programmed deformable section thus allows for the absorption of the mechanical energy resulting from an impact. By deforming, the programmed deformable section helps to preserve a portion of the intermediate floor located in line with the programmed deformable section.

[0032] - the programmed deformable part of the first seat cross member and / or the The second bearing beam is located in the extension of the programmed deformation zone of the intermediate floor, relative to the longitudinal axis. Such a configuration allows a synergistic effect of absorption of mechanical forces during an impact, of the considered programmed deformable part and of the programmed deformation zone;

[0033] - the programmed deformable part extends over a distance between 110 mm and 150 mm from the outer lateral edge of the intermediate floor, preferably equal to 130 mm from said outer lateral edge. Such a programmed deformable part secures the motor vehicle equipped with the fairing assembly conforming to the first aspect of the invention in the event of a collision. Such a configuration allows, in the event of a collision in the motor vehicle equipped with the invention, a deformation of the programmed deformable part preventing it from bearing damage to the integrity of the high-voltage electric battery of the motor vehicle in the event of a collision;

[0034] - the first seat cross member and / or the second seat cross member is formed of less a material comprising a first steel, and the programmed deformable part of the first and / or second crossmember is formed of a material comprising a second steel different from the first steel. Such a configuration improves the mechanical absorption of the first and / or second crossmember in the event of a collision in the motor vehicle equipped with the invention;

[0035] - the first steel has a higher modulus of elasticity than the second steel. Such a configuration optimizes the mechanical absorption of the first seat crossmember and / or the second seat crossmember in the event of a shock in the motor vehicle equipped with the invention;

[0036] - the second base cross member comprises a DP980 type steel outside the programmed deformable part and, at the level of said programmed deformable part, a DP600 type steel;

[0037] - a thickness of the deformable part of the second seat cross member is less than the thickness of the second seat cross member taken outside said programmed deformable part. Such a configuration optimizes the mass of the invention and promotes the specific, programmed and localized deformation of the second seat cross member at the level of its deformable part;

[0038] - the thickness of the programmed deformable part of the second seat cross member is less than 2 mm. Preferably, the thickness of the programmed deformable part of the second seat cross member is equal to 1.75 mm;

[0039] - the programmed deformable part of the second seat cross member is attached to the second cross member and fixed securely to it;

[0040] - the fairing assembly includes a high-voltage electric battery housed between the battery support and the intermediate floor, under the first seat cross member.

[0041] According to a second aspect of the invention, a motor vehicle is proposed comprising a fairing assembly conforming to the first aspect of the invention or to any of its improvements located under a driver's seat of said motor vehicle.

[0042] In the motor vehicle conforming to the second aspect of the invention, the fairing assembly forms a base of the motor vehicle.

[0043] In the motor vehicle according to the second aspect of the invention, the battery support extends between two longitudinal side members of the motor vehicle.

[0044] In the motor vehicle conforming to the second aspect of the invention, the concave profile of the intermediate floor forms a housing for an electric battery high voltage of the motor vehicle between said intermediate floor and the battery support.

[0045] In the motor vehicle according to the second aspect of the invention, the programmed deformation zone of the intermediate floor is configured to be able to compress in the event of a lateral impact to the motor vehicle and dissipate energy from said lateral impact.

[0046] In the motor vehicle according to the second aspect of the invention, the battery support supports the high-voltage electric battery of said motor vehicle.

[0047] In the motor vehicle according to the second aspect of the invention, the intermediate floor is fixed securely to the battery support.

[0048] In the motor vehicle conforming to the second aspect of the invention, the intermediate floor comprises the outer lateral edge. It is understood that the outer lateral edge forms an edge of the floor located on the side of the longitudinal member.

[0049] In the motor vehicle according to the second aspect of the invention, the programmed crumple zone of the intermediate floor forms a portion of the intermediate floor that is designed and configured to absorb the energy of a side impact to the motor vehicle. It is understood that the programmed crumple zone is designed and configured to absorb the energy of a side impact by deforming in a predictable manner. Typically, the programmed crumple zone is designed and configured to absorb the energy of a side impact to the motor vehicle by deforming predictably through compression. By deforming, the programmed crumple zone thus allows for the absorption of the mechanical energy resulting from an impact. By deforming, the programmed crumple zone helps to preserve a portion of the intermediate floor located in the extension of the programmed crumple zone.

[0050] Such a motor vehicle, equipped with a programmed crumple zone at the lateral edge of the intermediate floor, preserves the integrity of the battery support and the high-voltage electric battery of said motor vehicle. Thus, this solution ensures the safety of the motor vehicle and its occupants, while being simple to implement. The motor vehicle according to the invention has the advantage of overcoming the aforementioned drawbacks without requiring significant modifications.

[0051] Various embodiments of the invention are provided, incorporating, according to all their possible combinations, the different optional features set out here.

[0052] Other features and advantages of the invention will become apparent from the following description on the one hand, and from several embodiments given as examples. indicative and not exhaustive, with reference to the attached schematic drawings, on which:

[0053] [Fig.1] illustrates a schematic view of the underside of a motor vehicle conforming to the second aspect of the invention;

[0054] [Fig.2] illustrates a schematic view of a fairing assembly conforming to the first aspect of the invention equipping the motor vehicle shown in [Fig.1];

[0055] [Fig.3] illustrates the fairing assembly conforming to the first aspect of the invention shown in [Fig.2] after programmed deformation following a lateral impact to the motor vehicle it equips;

[0056] [Fig.4] illustrates the consequences of a side impact of the motor vehicle in accordance with the second aspect of the invention shown in [Fig.1].

[0057] Of course, the features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0058] In particular, all the variants and embodiments described are combinable with each other if there is no technical obstacle to this combination.

[0059] In the figures, the elements common to several figures retain the same reference.

[0060] Fig. 1 shows a schematic view of a motor vehicle 1 conforming to the second aspect of the invention. Said motor vehicle 1 is seen from below.

[0061] The motor vehicle 1 conforming to the second aspect of the invention comprises a fairing assembly 2 conforming to the first aspect of the invention. The fairing assembly 2 conforming to the first aspect of the invention is located under a driver's seat 3 of said motor vehicle 1. Said driver's seat 3, not visible due to the viewing angle, is represented by an ellipse in [Fig. 1].

[0062] In the motor vehicle 1 conforming to the second aspect of the invention shown in [Fig.1], the fairing assembly 2 forms a base of the motor vehicle 1.

[0063] In the motor vehicle 1 conforming to the second aspect of the invention shown in [Fig.1], a battery support 4 extends between two longitudinal side members 5, 6 of the motor vehicle 1, referred to as the first longitudinal side member 5 and the second longitudinal side member 6.

[0064] In the context of the present invention, a longitudinal axis 7, a transverse axis 8 and a vertical axis 9 are defined relative to the motor vehicle 1 conforming to the Second aspect of the invention. More specifically, the transverse axis 8 is understood as a direction taken between a lateral side 10 of the motor vehicle 1 and an opposite lateral side 11 of said motor vehicle 1, shown in [Fig. 1]. In other words, the transverse axis 8 is understood as a direction extending from a passenger side of the motor vehicle 1 to a driver's side of said motor vehicle 1, or vice versa. The adjectives lateral, inside, and outside refer to such a transverse axis 8. Furthermore, the longitudinal axis 7 is understood as being taken along a direction extending from front to rear or from rear to front of the motor vehicle 1. The longitudinal axis 7 is perpendicular to the transverse axis 8. The adjectives front, front, and rear refer to this longitudinal axis 7.Finally, the vertical axis 9 is understood as being taken along an axis extending from the wheels 12 of the motor vehicle 1 towards the roof of said motor vehicle 1, or vice versa, the vertical axis 9 being simultaneously perpendicular to the transverse axis 8 and to the longitudinal axis 7. The adjectives above and below, or lower and upper, refer to this vertical axis 9.

[0065] Figures 2 and 3 show the fairing assembly 2 conforming to the first aspect of the invention, fitted to the motor vehicle 1 shown in Figure 1. In Figure 2, the fairing assembly 2 conforming to the first aspect of the invention is intact. In Figure 3, the fairing assembly 2 conforming to the first aspect of the invention has been deformed in a programmed manner following a lateral impact to the motor vehicle 1 it fits. Figure 4 shows the consequences of the lateral impact sustained by the motor vehicle 1 conforming to the second aspect of the invention shown in Figure 1. The energy of the lateral impact is represented by an arrow 13 oriented along the transverse axis 8 in Figures 3 and 4. The motor vehicle 1 conforming to the second aspect of the invention is seen from below in [Fig.1] and in [Fig.4], and seen from above in [Fig.2] and in [Fig.3].

[0066] The fairing assembly 2 according to the first aspect of the invention comprises the battery support 4, which is generally flat and shown in [Fig. 1], and an intermediate floor 14 shown in [Fig. 2] and [Fig. 3], and integral with the battery support 4. In the motor vehicle 1 according to the invention, [Fig. 1], [Fig. 2], and [Fig. 3] show that the first longitudinal member 5 is proximal to the fairing assembly 2 according to the first aspect of the invention.

[0067] Fig. 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the intermediate floor 14 has a concave profile 15. It is understood that this concave profile 15 forms a housing for a high-voltage electric battery of the motor vehicle 1.

[0068] Said high-voltage electric battery 16 of the motor vehicle 1 is represented by a hatched frame in [Fig. 1] and in [Fig. 4]. It is understood that battery high voltage electric 16 of the motor vehicle 1 is housed, in the concave profile 15, between said intermediate floor 14 and the battery support 4, in the background in [Fig.1] and in the background in [Fig.4].

[0069] Figure 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the intermediate floor 14 has an outer lateral edge 17 opposite an inner lateral edge 18. In the motor vehicle 1 according to the second aspect of the invention, the outer lateral edge 17 of the intermediate floor 14 is located between the first longitudinal member 5 and the inner lateral edge 18 of the intermediate floor 14. The outer lateral edge 17 of the intermediate floor 14 is immediately adjacent to the first longitudinal member 5 in the motor vehicle 1 according to the invention.

[0070] Fig. 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the intermediate floor 14 further comprises a rear edge 19 opposed to a front edge 20 and connected to each other by the inner lateral edge 18 and the outer lateral edge 17.

[0071] Figure 2 shows that the fairing assembly 2 according to the first aspect of the invention comprises a programmed deformation zone 21, encircled by dashed lines. Figure 3 shows that this programmed deformation zone 21 is configured to compress in the event of a lateral impact and dissipate energy from said lateral impact. Figure 4 shows that, by deforming, the programmed deformation zone 21, which is not visible because it is in the background, thus allows for the absorption of mechanical energy resulting from the impact. By deforming, the programmed deformation zone 21 helps to protect the high-voltage electric battery 16 of the motor vehicle 1.

[0072] Figure 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the programmed deformation zone 21 comprises a plurality of grooves 22 extending relative to the longitudinal axis 7. The grooves 22 extend from the rear edge 19 of the intermediate floor 14 to the front edge 20 of the intermediate floor 14. The grooves 22 are regularly spaced relative to each other with respect to the longitudinal axis 7. The grooves 22 are parallel to each other. Figure 3 shows that, following the lateral impact, the grooves 22 contributed to guiding the deformation of the programmed deformation zone 21 of the fairing assembly 2 according to the first aspect of the invention.

[0073] Fig. 2 shows that the fairing assembly 2 according to the first aspect of the invention comprises a first seat cross member 23 and a second seat cross member 24. Each seat cross member 23, 24 forms a fixing support for the driver's seat 3 of the motor vehicle 1.

[0074] Fig. 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the first seat cross member 23 is fixed rigidly to the intermediate floor 14 at the level of its concave profile 15. It is understood that the high-voltage electric battery 16, not shown because it is in the background, is housed between the battery support 4 and the intermediate floor 14, under the first seat cross member 23.

[0075] Fig. 2 shows that, in the fairing assembly 2 conforming to the first aspect of the invention, the second seat cross member 24 is fixed securely to the intermediate floor 14, at the level of the rear edge 19 of said intermediate floor 14.

[0076] Figure 2 shows that, in the fairing assembly 2 according to the first aspect of the invention, the second seat cross member 24 comprises a programmed deformable portion 25. This programmed deformable portion 25 is analogous to the programmed deformation zone 21 of the intermediate floor 14 and is located in the extension of the programmed deformation zone 21 of the intermediate floor 14, relative to the longitudinal axis 7. The programmed deformable portion 25 includes grooves 27 oriented vertically and parallel to the grooves 22 of the programmed deformation zone 21. Figure 3 shows that the programmed deformable portion 25 is designed and configured to be able to absorb the energy of the lateral impact by deforming predictably by compression. Figure 4 shows that by deforming, the programmed deformable part 25 thus allows an absorption of the mechanical energy resulting from a shock.By deforming, the programmed deformable part 25 helps to preserve a part of the intermediate floor 14 located in the extension of the programmed deformable part 25, and thereby the high-voltage electric battery 16 of the motor vehicle 1.

[0077] In this case, [Fig. 2] shows that the programmed deformable portion 25 of the second bearing beam 24 extends from the outer lateral edge 17 of the intermediate floor 14. The programmed deformable portion 25 of the second bearing beam 24 is made of DP600 type steel with a thickness of 1.75 mm. Apart from the programmed deformable portion 25, the second bearing beam 24 is made of DP980 type steel with a thickness of 2 mm.

[0078] In summary, the invention relates to a fairing assembly 2 for a motor vehicle 1. The fairing assembly 2 forms the underbody of the motor vehicle 1 and comprises a battery support 4, which is generally flat and designed to extend between two longitudinal members 5, 6 of the motor vehicle 1, and an intermediate floor 14 integral with the battery support 4. The intermediate floor 14 has a concave profile 15 so as to form a housing for a high-voltage electric battery 16 of the motor vehicle 1 between said intermediate floor 14 and the battery support 4. According to the invention, the intermediate floor 14 has, at the level of an external lateral edge 17, a programmed deformation zone 21 configured to be able to compress in case of lateral shock and dissipate energy from said lateral shock.

[0079] Of course, the invention is not limited to the examples just described, and many modifications can be made to these examples without departing from the scope of the invention. In particular, the various features, forms, variants, and embodiments of the invention can be combined with one another in various ways, provided they are not incompatible or mutually exclusive. Specifically, all the variants and embodiments described above are combinable.

Claims

Demands

1. Fairing assembly (2) for a motor vehicle (1), the fairing assembly (2) forming a base of the motor vehicle (1) and comprising: - a generally flat extension battery support (4) intended to extend between two longitudinal members (5, 6) of the motor vehicle (1); - an intermediate floor (14) integral with the battery support (4), the intermediate floor (14) having a concave profile (15) so as to form a housing intended to house a high-voltage electric battery (16) of the motor vehicle (1) between said intermediate floor (14) and the battery support (4); - a first base cross member (23) fixed integrally to the intermediate floor (14) at the level of its concave profile (15); - a second base cross member (24) fixed integrally to the intermediate floor (14), at the level of a rear edge (19) of said intermediate floor (14);characterized in that the intermediate floor (14) has, at an external lateral edge (17), a programmed deformation zone (21) configured to be able to compress in the event of a lateral impact and dissipate energy from said lateral impact and in that the first bearing beam (23) and / or the second bearing beam (24) has a programmed deformable part (25) analogous to the programmed deformation zone (21) of the intermediate floor (14).

2. Fairing assembly (2) according to the preceding claim, wherein, relative to a transverse axis (8), the deformation zone extends over a distance between 110 mm and 150 mm from the outer lateral edge (17).

3. Fairing assembly (2) according to any one of the preceding claims, wherein the deformation zone comprises a plurality of grooves (22) which extend relative to the longitudinal axis (7).

4. Fairing assembly (2) according to any one of the preceding claims, wherein an intermediate floor thickness (14) is less than 2 mm, preferably equal to 1.3 mm.

5. Fairing assembly (2) according to claim 1, wherein the programmed deformable part (25) extends over a distance of between 110 mm and 150 mm from the outer lateral edge (17) of the intermediate floor (14), preferably equal to 130 mm from said outer lateral edge (17).

6. Fairing assembly (2) according to any one of claims 1 or 5, wherein the first seat cross member (23) and / or the second seat cross member (24) is formed of at least one material comprising a first steel, and the programmed deformable part (25) of the first seat cross member (23) and / or the second seat cross member (24) is formed of a material comprising a second steel different from the first steel.

7. Fairing assembly (2) according to any one of claims 1, 5 or 6, wherein a thickness of the deformable part of the second seat cross member (24) is less than the thickness of the second seat cross member (24) taken outside said programmed deformable part (25).

8. Motor vehicle (1) comprising a fairing assembly (2) according to any one of the preceding claims located under a driver's seat (3) of said motor vehicle (1).

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