Vehicle body floor assembly and vehicle

Abstract

The application provides a vehicle body floor assembly and a vehicle, and the vehicle body floor assembly comprises a vehicle body floor framework and a vehicle body floor connected with the vehicle body floor framework. The vehicle body floor framework comprises a rocker beam arranged on the left and right sides, a front reinforcing beam connected between the front ends of the rocker beams on the left and right sides, and a rear floor framework connected with the rear ends of the rocker beams on the left and right sides. The vehicle body floor comprises front side plates connected with the inner sides of the rocker beams on the left and right sides, a front end plate connected between the front ends of the front side plates on the left and right sides, and a rear floor panel connected with the bottom of the rear floor framework, and the front reinforcing beam is connected with the front end plate and forms a first cavity, and the front side plates on the left and right sides, the front end plate and the rear floor panel are all abutted on the battery pack at the bottom of the vehicle body. The vehicle body floor assembly can avoid process cavities, so as to ensure the sealing effect of the vehicle body floor and the battery pack, and effectively prevent water from entering the cab.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a vehicle body floor assembly, and the present application also relates to a vehicle with the vehicle body floor assembly. BACKGROUND

[0002] With the increasingly serious energy crisis, the number of electric drive vehicles is increasing, and when a traditional fuel vehicle is converted into an electric drive vehicle, a battery pack is usually directly added under the front floor of the vehicle body, and a safety gap of no less than 10mm needs to be reserved between the battery pack and the vehicle body, which has the problems of low space utilization, redundant structure and large vehicle weight. In the existing vehicle body, the front floor panel is generally removed, and a sealing ring is added to the vehicle body to seal with the upper cover of the battery pack. However, due to the high difference between the front and rear of the rear floor longitudinal beam, in order to achieve the sealing, a large number of parts are required, the structure is complex, and large process holes cannot be avoided, which has a serious sealing risk, resulting in water entering the cab. SUMMARY

[0003] Therefore, the present application aims to provide a vehicle body floor assembly which can improve the sealing effect with the battery pack and effectively prevent water from entering the cab.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] A vehicle body floor assembly, comprising a vehicle body floor framework and a vehicle body floor connected with the vehicle body floor framework.

[0006] The vehicle body floor framework comprises a rocker beam arranged on the left and right sides, a front reinforcing beam connected between the front ends of the rocker beams on the left and right sides, and a rear floor framework connected with the rear ends of the rocker beams on the left and right sides.

[0007] The vehicle body floor comprises a front side plate connected to the inner side of the rocker beam on each side, a front end plate connected between the front ends of the front side plates on the left and right sides, and a rear floor panel connected to the bottom of the rear floor framework, and the front reinforcing beam is connected with the front end plate and forms a first cavity, and the front side plates on the left and right sides, the front end plate and the rear floor panel are all abutted on the battery pack at the bottom of the vehicle body.

[0008] Further, the rear floor framework comprises rear floor longitudinal beams arranged on the left and right sides, and a rear floor middle cross beam connected between the rear floor longitudinal beams on the left and right sides.

[0009] The rear floor middle cross beam is connected with the rear floor panel and forms a second cavity arranged along the left-right direction of the vehicle.

[0010] Further, the rear floor panel has an extension part extending to the front of the rear floor front cross beam, and the extension part is abutted with the battery pack.

[0011] A rear reinforcing beam is arranged between the two rear floor longitudinal beams, and the rear reinforcing beam is connected with the extension part and is configured to form a third cavity.

[0012] Further, the rear floor framework comprises the rear floor front cross beam connected between the two rear floor longitudinal beams.

[0013] The rear floor front cross beam is connected with the rear floor middle cross beam, and a mounting bracket is arranged between the rear floor front cross beam and the rear floor middle cross beam, and the mounting bracket is used for mounting a rear seat.

[0014] Further, the rear floor longitudinal beam comprises a front end part, a rear end part, and an intermediate part arranged between the front end part and the rear end part.

[0015] In the vertical direction of the vehicle, the height of the front end part is less than the height of the rear end part, and the rear floor middle cross beam is connected between the two intermediate parts.

[0016] Further, the rear floor longitudinal beam comprises a main plate in the shape of "L", and a cover plate arranged close to the outer side of the main plate.

[0017] The main plate, the cover plate and the rear floor panel are connected, and are configured to form a fourth cavity extending in the front-rear direction of the vehicle.

[0018] Further, the rear floor panel comprises rear side plates arranged opposite to each other in the left-right direction of the vehicle, and an intermediate plate arranged between the two rear side plates.

[0019] The rear side plate is integrally formed with the front side plate and the front end plate, and the thickness of the rear side plate is greater than the thickness of the intermediate plate, and the rear side plate and the intermediate plate are laser-welded together.

[0020] Further, a rear floor rear cross beam is connected between the two rear floor longitudinal beams.

[0021] The intermediate plate has a convex part protruding upwards, the convex part is located between the rear floor middle cross beam and the rear floor rear cross beam, and an avoiding space is formed in the convex part; and / or,

[0022] The intermediate plate has a concave part protruding downwards, and the concave part is located behind the rear floor rear cross beam.

[0023] Further, a mounting cross beam is connected between the two rocker beams, and the mounting cross beam is used for mounting a front seat.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The vehicle body floor assembly of the present application, by making the vehicle body floor include a front side plate, a front end plate, and a floor panel arranged at the bottom of the vehicle body floor framework, and by the front side plate, the front end plate and the rear floor panel all abutting on the battery pack at the bottom of the vehicle body, the communication between the cab and the outside can be blocked by the rear floor panel and the battery pack, and the bottom of the vehicle body floor assembly does not have a lap joint structure of longitudinal beams and cross beams, which can avoid process cavities, thereby ensuring the sealing effect of the vehicle body floor and the battery pack, and effectively preventing water from entering the cab.

[0026] Furthermore, the front side plate, the front end plate and the rear floor panel form a closed ring, so that the periphery of the battery pack is in contact with the plane, and better sealing performance can be achieved. At the same time, the vehicle body floor itself can also form a closed force transmission ring, which facilitates the decomposition of the collision force in each direction, thereby reducing the impact of the collision force on the battery pack, and improving the safety of the whole vehicle.

[0027] In addition, the rear floor middle cross beam is connected with the rear floor panel and surrounds a second cavity arranged along the left-right direction of the whole vehicle, which can improve the structural strength of the vehicle body floor assembly. The rear reinforcing beam is connected with the extension part and surrounds a third cavity, which can prevent the extension part from deforming, thereby improving the sealing effect between the extension part and the battery pack. The mounting bracket for mounting the rear seat is provided, which can eliminate the need to provide a middle panel and reduce the weight and cost of parts.

[0028] Secondly, the rear floor middle cross beam is connected between the two middle parts, which can improve the structural strength of the vehicle body floor framework. The rear floor longitudinal beam includes a main plate in the shape of "L" and a cover plate arranged on the side of the main plate close to the outside of the vehicle, which is simple in structure and convenient for processing and manufacturing, and also facilitates the connection of the rear floor longitudinal beam with the rear floor panel.

[0029] In addition, the thickness of the rear side plate is greater than that of the middle plate, and the rear side plate and the middle plate are laser welded together, which can integrally form the rear floor panel, improve the sealing effect of the cab, and also improve the stress strength at the rear floor longitudinal beam. The protruding part arranged on the middle plate can be used to avoid the rear-drive motor and other components, and also can improve the structural strength of the middle plate. By making the middle plate have a concave recessed part, the spare tire and other components can be arranged, and the structural strength of the middle plate can also be improved.

[0030] Another object of the present application is to provide a vehicle provided with the vehicle body floor assembly as described above.

[0031] The vehicle of the present application has the same beneficial effects as the above-mentioned vehicle body floor assembly relative to the prior art, and will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The illustrations are shown in the drawings, wherein:

[0033] Figure 1 An assembly state diagram of a vehicle body floor assembly and a battery pack according to an embodiment of the present application;

[0034] Figure 2 An assembly state diagram of a vehicle body floor assembly and a battery pack according to an embodiment of the present application from another perspective;

[0035] Figure 3 A structural schematic diagram of a vehicle body floor assembly according to an embodiment of the present application;

[0036] Figure 4 A structural schematic diagram of a vehicle body floor assembly according to an embodiment of the present application from another perspective;

[0037] Figure 5 A structural schematic diagram of a vehicle body floor assembly according to an embodiment of the present application from another perspective;

[0038] Figure 6 A structural schematic diagram of a vehicle body floor assembly according to an embodiment of the present application from another perspective; Figure 3 An enlarged view of part A in FIG. 8.

[0039] Explanation of reference signs:

[0040] 1, rocker beam; 2, vehicle body floor; 3, battery pack; 4, rear floor longitudinal beam; 5, rear floor front cross beam; 6, rear floor middle cross beam; 7, rear floor rear cross beam; 8, mounting cross beam; 9, mounting bracket; 10, rear reinforcement beam; 11, front reinforcement beam;

[0041] 2a, front side plate; 2b, front end plate; 2c, rear floor panel; 201, convex portion; 202, concave portion;

[0042] 401, main plate; 402, cover plate;

[0043] 4a, front end portion; 4b, middle portion; 4c, rear end portion. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] In the description of the present application, it should be noted that the orientation words such as "upper", "lower", "left", "right", "front", "back" used in the present embodiment are defined with the up-down direction, left-right direction and front-back direction of the automobile as the reference. Among them, the up-down direction of the automobile is also the height direction (Z direction) of the automobile, the front-back direction of the automobile is also the length direction (X direction) of the automobile, and the left-right direction of the automobile is also the width direction (Y direction) of the automobile. In addition, the terms "first" and "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0046] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection", "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in conjunction with the specific circumstances.

[0047] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0048] The present embodiment relates to a vehicle body floor assembly, which aims to improve the sealing between the vehicle body floor 2 and the battery pack 3, and prevent water from entering the cab. In terms of overall structure, the vehicle body floor assembly comprises a vehicle body floor framework, and a vehicle body floor 2 connected with the vehicle body floor framework.

[0049] Among them, the vehicle body floor framework comprises a rocker 1 arranged on the left and right sides, a front reinforcing beam 11 connected between the front ends of the two rocker 1, and a rear floor framework connected with the rear end of each rocker 1. And the vehicle body floor 2 comprises a front side plate 2a connected to the inner side of the two rockers 1 respectively, a front end plate 2b connected between the front ends of the two front side plates 2a, and a rear floor panel 2c connected to the bottom of the rear floor framework. And the front reinforcing beam 11 is connected with the front end plate 2b and forms a first cavity, and the two front side plates 2a, the front end plate 2b and the rear floor panel 2c all abut on the battery pack 3 located at the bottom of the vehicle body.

[0050] The vehicle floor assembly of this embodiment includes a front side panel 2a, a front end panel 2b, and a floor panel located at the bottom of the vehicle floor 2 frame. The front side panel 2a, front end panel 2b, and rear floor panel 2c all abut against the battery pack 3 located at the bottom of the vehicle body. The rear floor panel 2c and battery pack 3 isolate the passenger compartment from the outside environment. Furthermore, the front side panel 2a, front end panel 2b, and rear floor panel 2c form a closed ring, ensuring that the periphery of the battery pack 3 is in contact with a flat surface, achieving good sealing performance. Simultaneously, the vehicle floor 2 itself forms a closed force transmission ring, facilitating the distribution of impact forces from various directions, thereby reducing the impact of collision forces on the battery pack 3 and improving overall vehicle safety.

[0051] Furthermore, because the bottom of the vehicle floor assembly lacks overlapping structures with longitudinal and transverse beams, and the front side panel 2a, front end panel 2b, and rear floor panel 2c are sheet metal structures, they can be integrally molded or well spliced ​​together, avoiding manufacturing voids. This ensures the sealing effect between the vehicle floor 2 and the battery pack 3, effectively preventing water ingress into the passenger compartment. Moreover, by forming a first cavity with the front reinforcing beam 11 and the front end panel 2b, the structural strength at the front end panel 2b is increased, preventing deformation of the front end panel 2b and thus reducing the sealing performance between it and the battery pack 3.

[0052] Based on the above overall structure, an exemplary structure of the vehicle floor 2 assembly in this embodiment is referenced. Figures 1 to 5 As shown, to improve the installation stability of the battery pack 3, in a specific implementation, the front end of the battery pack 3 can be connected to the front end plate 2b and the front reinforcing beam 11. Additionally, as a preferred embodiment, combined with... Figures 3 to 5 As shown, the rear floor frame of this embodiment includes rear floor longitudinal beams 4 disposed on the left and right sides, and a rear floor central crossbeam 6 connecting the two rear floor longitudinal beams 4. Furthermore, the rear floor central crossbeam 6 is connected to the rear floor panel 2c and forms a second cavity arranged along the left-right direction of the entire vehicle.

[0053] This design effectively improves the structural strength of the vehicle floor assembly. Furthermore, compared to structures where the rear floor crossbeam 6 itself has an internal cavity, it reduces the overall vehicle weight. Moreover, by placing the rear floor panel 2c at the bottom of the rear floor crossbeam 6, compared to existing structures, there is no need for an overlapping structure at the rear floor crossbeam 6, meaning no process holes are created, effectively preventing water ingress into the passenger compartment. As a further embodiment, the rear floor frame also includes a rear floor front crossbeam 5 connecting the two rear floor longitudinal beams 4. This rear floor front crossbeam 5 is located in front of the rear floor crossbeam 6, and it also forms a cavity with the rear floor panel 2c to improve the structural strength of the vehicle floor assembly.

[0054] It should be noted that the rear floor front cross beam 5 and the rear floor middle cross beam 6 are both formed with cavities together with the rear floor panel 2c, which is an optimal embodiment. Of course, the rear floor front cross beam 5 or the rear floor middle cross beam 6 is not formed with a cavity together with the rear floor panel 2c, but has a cavity in itself, which is also feasible, that is, the cross section of the rear floor front cross beam 5 or the rear floor middle cross beam 6 is in the shape of a closed ring, for example, a rectangle.

[0055] As a preferred embodiment, as shown in Figure 3 , two mounting cross beams 8 are connected between the two side rocker beams 1, and the mounting cross beams 8 are used for mounting the front row seats. In the embodiment, the mounting cross beams 8 are specifically two mounting cross beams arranged in front of and behind each other. The mounting cross beams 8 are in an equal cross section structure and are in a straight structure extending along the left-right direction of the whole vehicle, so that the mounting cross beams 8 can form a force transmission beam smoothly transmitting along the left-right direction of the whole vehicle and quickly transmitting the collision force. In this way, the protection of the battery pack 3 in the side collision can be greatly improved, and the safety performance of the whole vehicle can be improved. The traditional vehicle body floor 2 has a middle channel, the mounting cross beams 8 are interrupted and not smooth, the side collision effect is poor, and the force transmission and the protection of the battery pack 3 are not conducive.

[0056] In addition, as shown in Figure 4 , the rear floor longitudinal beam 4 of the embodiment includes a front end portion 4a, a rear end portion 4c, and an intermediate portion 4b arranged between the front end portion 4a and the rear end portion 4c. In the up-down direction of the whole vehicle, the height of the front end portion 4a is less than the height of the rear end portion 4c, and the rear floor middle cross beam 6 is connected between the two intermediate portions 4b, so as to improve the structural strength of the vehicle body floor framework. In addition, the distance between the two side rocker beams 1 is generally large, so as to have a large driver's cabin, which is conducive to improving the comfort of the passengers. In this way, in order to facilitate the connection of the front end portion 4a and the rocker beam 1, as shown in Figure 2 , the distance between the two front end portions 4a is greater than the distance between the two rear end portions 4c.

[0057] In the embodiment, in order to further improve the structural strength of the vehicle body floor framework, as shown in Figure 3 , a rear floor rear cross beam 7 is connected between the two rear floor longitudinal beams 4. The number of the rear floor rear cross beam 7 is not limited to one as shown in the figure, and can be adjusted according to the design requirements. In addition, as shown in Figure 3 and Figure 5 , the rear floor panel 2c has an extension portion extending to the front of the rear floor middle cross beam 6, and the extension portion abuts against the battery pack 3. In addition, a rear reinforcing beam 10 is arranged between the two rear floor longitudinal beams 4, and the rear reinforcing beam 10 is connected with the extension portion and is formed with a third cavity.

[0058] In this embodiment, by connecting the rear reinforcing beam 10 with the extension part and forming a third cavity, the extension part can be prevented from deforming, thereby improving the sealing effect between the extension part and the battery pack 3. Moreover, to further improve the mounting stability of the battery pack 3, in the specific implementation, the rear end of the battery pack 3 can be connected with the extension part and the rear reinforcing beam 10.

[0059] At this time, in order to facilitate the installation of the rear row seat, as a preferred embodiment, as shown in Figures 3 to 5 The mounting bracket 9 is connected between the rear floor front cross beam 5 and the rear floor middle cross beam 6, and is used for mounting the rear row seat. Moreover, as a preferred embodiment, in order to reduce the overall weight, as shown in Figure 4 The mounting bracket 9 of the embodiment is in a plate shape, and includes a plate body part extending along the front-rear direction of the whole vehicle, a front turn-up edge provided at the front end of the plate body, and a rear turn-up edge provided at the rear end of the plate body.

[0060] As shown in Figure 4 The mounting bracket 9 of the embodiment is connected with the rear floor front cross beam 5 through the front turn-up edge, and is connected with the rear floor middle cross beam 6 through the rear turn-up edge. In this way, by providing the front turn-up edge and the rear turn-up edge, not only the mounting bracket 9 can be connected with the rear floor front cross beam 5 and the rear floor middle cross beam 6 easily, but also the mounting bracket 9 can have a good structural strength, thereby ensuring the mounting strength of the rear row seat.

[0061] Based on the above description, in order to improve the sealing effect of the vehicle body floor assembly, as a preferred embodiment, as shown in Figure 3 The rear floor longitudinal beam 4 of the embodiment includes a main plate 401 in an "L" shape, and a cover plate 402 provided at the side of the main plate 401 close to the outside of the vehicle. Moreover, the main plate 401 and the cover plate 402 are connected with the rear floor panel 2c, and form a fourth cavity extending along the front-rear direction of the whole vehicle. In addition, in order to facilitate the connection between the main plate 401, the cover plate 402 and the rear floor panel 2c, as shown in Figure 6 The top of the cover plate 402 is convex relative to the main plate 401, and the bottom of the cover plate 402 is provided with a first turn-up edge turned outward. The bottom of the main plate 401 is provided with a second turn-up edge turned outward. The cover plate 402 is connected with the rear floor panel 2c by spot welding through the first turn-up edge, and the main plate 401 is connected with the rear floor panel 2c by spot welding through the second turn-up edge. The first turn-up edge and the second turn-up edge can make the plate bodies of the rear floor longitudinal beam 4 fit well and have a high structural strength.

[0062] In addition, as shown in Figure 3As shown, the longitudinal rear floor beam 4 of this embodiment is connected to the sill beam 1 through the cover plate 402, and the cover plate 402 is convexly arranged relative to the sill beam 1. That is, the longitudinal rear floor beam 4 of this embodiment is connected to the sill beam 1 through a plane, which can make the two fit fully, reduce the gap between them, and at the same time facilitate the application of sealant on the cover plate 402, further improving the sealing performance between the two, and thus preventing water from entering the cab from this gap.

[0063] It should be noted here that in addition to including the main board 401 and the cover plate 402 arranged separately, the main board 401 and the cover plate 402 of the longitudinal rear floor beam 4 can also be integrally formed. That is, the cross-section of the longitudinal rear floor beam 4 is in a "U" shape, or the cross-section of the longitudinal rear floor beam 4 is set to be rectangular, which is also feasible.

[0064] Combined with Figures 3 to 5 As shown, as a preferred embodiment, the rear floor panel 2c of this embodiment includes rear side plates arranged oppositely in the left-right direction of the whole vehicle, and an intermediate plate arranged between the two rear side plates. Among them, the rear side plates are integrally formed with the front side plate 2a and the front end plate 2b, and the thickness of the rear side plates is greater than that of the intermediate plate. The rear side plates and the intermediate plate are laser welded together.

[0065] With such a design, it can not only fully reduce the weight of the rear floor panel 2c, contribute to the lightweight design, but also make the rear floor panel 2c integrally formed, improve the sealing effect on the cab, and at the same time improve the stress intensity at the longitudinal rear floor beam 4. In addition, during specific implementation, the strength of the plates used for the rear side plates and the front side plate​​​​​​​​​As shown in the figure, the intermediate plate has a concave recessed portion 202 which is concave downward and is located behind the rear floor rear cross beam 7. In this embodiment, by making the intermediate plate have a concave recessed portion 202, it can be used to arrange spare tire and other components, and at the same time, the structural strength of the intermediate plate can be improved. Among them, as shown in the figure, the convex portion 201 and the recessed portion 202 are arranged on the same side of the intermediate plate, and the convex portion 201 and the recessed portion 202 are arranged on the same side of the intermediate plate. Figure 4 As shown in the figure, in order to have better use effect, in this embodiment, the convex portion 201 and the recessed portion 202 are arranged at the same time, of course, according to the design requirements, the convex portion 201 is not arranged and the recessed portion 202 is not arranged.

[0068] The vehicle body floor assembly of the embodiment, by adopting the above structure, because the bottom of the vehicle body floor 2 does not have a cross beam lap joint structure, it can avoid the problem of process cavity caused by lap joint, which leads to the risk of sealing failure. In addition, by abutting the battery pack 3 with the front side plate 2a, the front end plate 2b and the rear floor panel 2c, the sealing effect of the cab can be improved, and water can be prevented from entering the cab. And, in specific implementation, sealing glue can be applied at the abutting part of the battery pack 3 and the vehicle body floor 2 to improve the sealing performance of the bottom of the cab. Moreover, the vehicle body floor 2 of the embodiment is an integral structure, which can realize the integrated design of the rocker beam 1, facilitate processing and manufacturing, improve production efficiency, and also has good structural strength. In addition, the vehicle body floor 2 can form a ring-shaped force transmission structure, which can reduce the damage of the collision force to the battery pack 3, thereby effectively improving the safety of the whole vehicle.

[0069] In addition, the embodiment also relates to a vehicle provided with the above vehicle body floor 2 assembly.

[0070] The vehicle of the embodiment has all the beneficial effects of the above vehicle body floor 2 assembly, which will not be repeated here.

[0071] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle body floor assembly, characterized in that: comprising a vehicle body floor framework, and a vehicle body floor (2) connected with the vehicle body floor framework; the vehicle body floor framework comprises sill beams (1) arranged on left and right sides, a front reinforcement beam (11) connected between front ends of the sill beams (1) on the left and right sides, and a rear floor framework connected with rear ends of the sill beams (1) on the left and right sides; the vehicle body floor (2) comprises front side plates (2a) connected with inner sides of the sill beams (1) on the left and right sides respectively, a front end plate (2b) connected between front ends of the front side plates (2a) on the left and right sides, and a rear floor panel (2c) connected with a bottom of the rear floor framework, and the front reinforcement beam (11) is connected with the front end plate (2b) and forms a first cavity, and the front side plates (2a), the front end plate (2b) and the rear floor panel (2c) are all abutted on a battery pack (3) at a bottom of the vehicle body, and the front side plates (2a), the front end plate (2b) and the rear floor panel (2c) form a closed ring; the rear floor framework comprises rear floor longitudinal beams (4) arranged on left and right sides, a rear floor middle cross beam (6) connected between the rear floor longitudinal beams (4) on the left and right sides, and a rear floor front cross beam (5) connected between the rear floor longitudinal beams (4) on the left and right sides; the rear floor middle cross beam (6) is connected with the rear floor panel (2c) and forms a second cavity arranged along a left-right direction of the vehicle, and a mounting bracket (9) is connected between the rear floor front cross beam (5) and the rear floor middle cross beam (6), and the mounting bracket (9) is used for mounting a rear seat. 2.The vehicle body floor assembly according to claim 1, characterized in that: the rear floor panel (2c) has an extension part extending to a front of the rear floor middle cross beam (6), and the extension part is abutted on the battery pack (3); a rear reinforcement beam (10) is arranged between the rear floor longitudinal beams (4) on the left and right sides, and the rear reinforcement beam (10) is connected with the extension part and forms a third cavity. 3.The vehicle body floor assembly according to claim 1, characterized in that: the rear floor longitudinal beam (4) comprises a front end part (4a), a rear end part (4c), and an intermediate part (4b) arranged between the front end part (4a) and the rear end part (4c); in a top-bottom direction of the vehicle, a height of the front end part (4a) is less than a height of the rear end part (4c), and the rear floor middle cross beam (6) is connected between the intermediate parts (4b) on the left and right sides. 4.The vehicle body floor assembly according to claim 1, characterized in that: the rear floor longitudinal beam (4) comprises a main plate (401) in an "L" shape, and a cover plate (402) arranged on a side close to an outside of the vehicle of the main plate (401); the main plate (401), the cover plate (402) and the rear floor panel (2c) are connected and form a fourth cavity extending along a front-rear direction of the vehicle. 5.The vehicle body floor assembly according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The rear floor panel (2c) comprises rear side panels arranged opposite in the left-right direction of the whole vehicle, and a middle panel arranged between the two side panels; The rear side panels are integrally formed with the front side panels (2a) and the front end panel (2b), and the thickness of the rear side panels is greater than that of the middle panel, and the rear side panels and the middle panel are laser-welded together.

6. The vehicle body floor assembly according to claim 5, characterized in that: A rear floor rear cross beam (7) is connected between the two rear floor longitudinal beams (4); The middle panel has an upwardly convex convex portion (201) between the rear floor middle cross beam (6) and the rear floor rear cross beam (7), and a clearance space is formed in the convex portion (201); and / or The middle panel has a downwardly concave concave portion (202) behind the rear floor rear cross beam (7).

7. The vehicle body floor assembly according to any one of claims 1 to 6, characterized in that: A mounting cross beam (8) is connected between the two rocker beams (1), and the mounting cross beam (8) is used for mounting front-row seats.

8. A vehicle, characterized in that: The vehicle is provided with the vehicle body floor assembly according to any one of claims 1 to 7.

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