Vehicle body floor assembly and vehicle

Abstract

The invention provides a vehicle body floor assembly and a vehicle. 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 threshold beams arranged on the left side and the right side respectively, a front reinforcing beam connected between the front ends of the threshold beams on the two sides, and a rear floor framework connected with the rear ends of the threshold beams on the two sides. The vehicle body floor comprises front side plates connected to the inner sides of the doorsill beams on the two sides respectively, a front end plate connected between the front ends of the front side plates on the two 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 to define a first cavity; the front side plates on the two sides, the front end plate and the rear floor panel abut against a battery pack located at the bottom of the vehicle body. According to the vehicle body floor assembly, process holes can be avoided, so that the sealing effect of the vehicle body floor and the battery pack can be guaranteed, and water can be effectively prevented from entering a cab.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle body floor assembly. The present invention also relates to a vehicle having the vehicle body floor assembly. Background Art

[0002] As the energy crisis becomes increasingly serious, the number of electric vehicles is increasing. When converting traditional fuel vehicles into electric vehicles, battery packs are usually added directly to the lower part of the front floor of the oil vehicle body. The battery pack and the body must retain a safety gap of no less than 10mm, which leads to low space utilization, structural redundancy, and heavy vehicle weight. In existing vehicle bodies, the front floor panel is generally removed, and a sealing ring is added to the body to seal with the battery pack cover. However, due to the high front-to-back drop of the rear floor longitudinal beam, in order to achieve this sealing, a large number of parts are required, the structure is complex, and there are unavoidable large process holes, which poses a serious sealing risk and causes water to enter the cab. Summary of the invention

[0003] In view of this, the present invention 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 object, the technical solution of the present invention is achieved as follows:

[0005] A vehicle body floor assembly comprises a vehicle body floor frame and a vehicle body floor connected to the vehicle body floor frame;

[0006] The vehicle body floor frame includes sill beams disposed on the left and right sides, a front reinforcing beam connected between the front ends of the sill beams on both sides, and a rear floor frame connected to the rear ends of the sill beams on each side;

[0007] The vehicle body floor includes front side panels respectively connected to the inner sides of the door sill beams on both sides, a front end panel connected between the front ends of the front side panels on both sides, and a rear floor panel connected to the bottom of the rear floor frame, and the front reinforcing beam is connected to the front end panel and surrounds a first cavity, and the front side panels on both sides, the front end panel and the rear floor panel are all in contact with the battery pack located at the bottom of the vehicle body.

[0008] Furthermore, the rear floor frame includes rear floor longitudinal beams disposed on the left and right sides, and a rear floor middle cross beam connected between the rear floor longitudinal beams on the two sides;

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

[0010] Further, the rear floor panel has an extension portion extending to the front of the rear floor front cross beam, and the extension portion abuts against the battery pack;

[0011] A rear reinforcing beam is provided between the rear floor longitudinal beams on both sides, and the rear reinforcing beam is connected to the extending portion and surrounds and forms a third cavity.

[0012] Further, the rear floor frame includes the rear floor front cross beam connected between the rear floor longitudinal beams on both sides;

[0013] A mounting bracket is connected between the rear floor front cross beam and the rear floor middle cross beam, and the mounting bracket is used for mounting rear seats.

[0014] Further, the rear floor longitudinal beam includes a front end portion, a rear end portion, and a middle portion disposed between the front end portion and the rear end portion;

[0015] In the up-down direction of the vehicle, the height of the front end portion is smaller than the height of the rear end portion, and the rear floor middle cross beam is connected between the middle portions on both sides.

[0016] Furthermore, the rear floor longitudinal beam includes an "L"-shaped main board, and a cover plate provided on a side of the main board close to the outside of the vehicle;

[0017] The main board and the cover board are connected to the rear floor panel and surround and form a fourth cavity extending along the front-rear direction of the entire vehicle.

[0018] Furthermore, the rear floor panel includes rear side panels arranged opposite to each other in the left-right direction of the vehicle, and a middle panel arranged between the rear side panels on both sides;

[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 middle plate. The rear side plate and the middle plate are welded together by laser.

[0020] Furthermore, a rear floor rear cross beam is connected between the rear floor longitudinal beams on both sides;

[0021] The middle plate has an upwardly protruding portion, the protruding portion is located between the rear floor middle cross beam and the rear floor rear cross beam, and an escape space is formed in the protruding portion; and / or,

[0022] The middle plate has a depressed portion that is concave downward, and the depressed portion is located behind the rear cross member of the rear floor.

[0023] Furthermore, a mounting crossbeam is connected between the threshold beams on both sides, and the mounting crossbeam is used for mounting the front seats.

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

[0025] The vehicle body floor assembly described in the present invention includes a front side panel, a front end panel, and a floor panel arranged at the bottom of the vehicle body floor frame, and the front side panel, the front end panel and the rear floor panel are all abutted against a battery pack located at the bottom of the vehicle body. The connection between the cab and the outside world can be cut off by the rear floor panel and the battery pack. There is no overlapping structure of longitudinal beams and transverse beams at the bottom of the vehicle body floor assembly, which can avoid the occurrence of process voids, thereby ensuring the sealing effect of the vehicle body floor and the battery pack, and effectively preventing water from entering the cab.

[0026] Moreover, the front side plate, front end plate and rear floor panel form a closed ring, so that the periphery of the battery pack is in contact with the plane, which can achieve better sealing performance. At the same time, the body floor itself can also form a closed force transmission ring, which is convenient for decomposing the collision force in all directions, 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 beam is connected to the rear floor panel and surrounds a second cavity arranged along the left and right direction of the vehicle, which can improve the structural strength of the body floor assembly. By connecting the rear reinforcement beam to the extension part and surrounding a third cavity, the extension part can be prevented from deforming, thereby improving the sealing effect between the extension part and the battery pack. The installation bracket for installing the rear seats can save the middle panel and reduce the weight cost of parts.

[0028] Secondly, the rear floor middle crossbeam is connected between the middle parts of the two sides, which can improve the structural strength of the body floor frame. The rear floor longitudinal beam includes an "L"-shaped main board and a cover plate arranged on the main board near the outside of the vehicle. The structure is simple, easy to process and manufacture, and also convenient for connecting the rear floor longitudinal beam with the rear floor panel.

[0029] In addition, the thickness of the rear side panel is greater than that of the middle panel. The rear side panel and the middle panel are laser welded together, so that the rear floor panel can be formed in one piece, which improves the sealing effect of the cab and the stress strength of the rear floor longitudinal beam. The middle panel is provided with a protruding part, which can be used to avoid components such as the rear drive motor, and can also improve the structural strength of the middle panel. By making the middle panel have a concave part, it can be used to arrange components such as spare tires, and can also improve the structural strength of the middle panel.

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

[0031] The vehicle described in the present invention has the same beneficial effects as the above-mentioned vehicle body floor assembly relative to the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

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

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

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

[0036] Figure 4 It is a structural schematic diagram of the vehicle body floor assembly according to an embodiment of the present invention from another viewing angle;

[0037] Figure 5 It is a structural schematic diagram of the vehicle body floor assembly according to an embodiment of the present invention from another viewing angle;

[0038] Figure 6 for Figure 3 Enlarged view of part A.

[0039] Description of reference numerals:

[0040] 1. Door sill beam; 2. Car 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 panel; 2b, front end panel; 2c, rear floor panel; 201, protruding portion; 202, recessed portion;

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

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

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

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

[0046] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

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

[0048] This embodiment relates to a vehicle body floor assembly, the purpose of which is to improve the sealing between the vehicle body floor 2 and the battery pack 3 to prevent water from entering the cab. In terms of overall structure, the vehicle body floor assembly includes a vehicle body floor frame and a vehicle body floor 2 connected to the vehicle body floor frame.

[0049] The vehicle body floor frame includes the sill beams 1 arranged on the left and right sides, the front reinforcing beam 11 connected between the front ends of the sill beams 1 on both sides, and the rear floor frame connected to the rear ends of the sill beams 1 on each side. The vehicle body floor 2 includes the front side panels 2a connected to the inner sides of the sill beams 1 on both sides, the front end panel 2b connected between the front ends of the front side panels 2a on both sides, and the rear floor panel 2c connected to the bottom of the rear floor frame. In addition, the front reinforcing beam 11 is connected to the front end panel 2b, and a first cavity is formed by the surrounding structure. The front side panels 2a on both sides, the front end panel 2b and the rear floor panel 2c are all in contact with the battery pack 3 located at the bottom of the vehicle body.

[0050] The vehicle body floor assembly of this embodiment is such that the vehicle body floor 2 includes a front side panel 2a, a front end panel 2b, and a floor panel disposed at the bottom of the frame of the vehicle body floor 2, and the front side panel 2a, the front end panel 2b, and the rear floor panel 2c are all in contact with the battery pack 3 located at the bottom of the vehicle body, and the connection between the cab and the outside world can be cut off by the rear floor panel 2c and the battery pack 3. Moreover, the front side panel 2a, the front end panel 2b, and the rear floor panel 2c form a closed ring, so that the periphery of the battery pack 3 is in contact with the plane, and better sealing performance can be achieved. At the same time, the vehicle body floor 2 itself can also form a closed force transmission ring, which is convenient for decomposing the collision force in all directions, thereby reducing the impact of the collision force on the battery pack 3 and improving the safety of the whole vehicle.

[0051] In addition, since there is no overlapping structure of longitudinal beams and transverse beams at the bottom of the vehicle body floor assembly, and the front side panel 2a, the front end panel 2b and the rear floor panel 2c are plate structures, they can be integrally formed or well spliced ​​together, and process voids can be avoided, thereby ensuring the sealing effect between the vehicle body floor 2 and the battery pack 3, and effectively preventing water from entering the cab. Moreover, by making the front reinforcing beam 11 and the front end panel 2b enclose and form a first cavity, the structural strength of the front end panel 2b can be increased, preventing the front end panel 2b from deforming and reducing the sealing performance between the battery pack 3.

[0052] Based on the above overall structure, an exemplary structure of the vehicle body floor 2 assembly of this embodiment is referred to as follows: Figures 1 to 5 As shown in , in order to improve the installation firmness of the battery pack 3, in 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. In addition, as a preferred embodiment, combined with Figures 3 to 5 As shown in the figure, the rear floor frame of this embodiment includes rear floor longitudinal beams 4 arranged on the left and right sides, and a rear floor middle cross beam 6 connected between the rear floor longitudinal beams 4 on both sides. In addition, the rear floor middle cross beam 6 is connected to the rear floor panel 2c, and a second cavity is formed along the left and right direction of the vehicle.

[0053] Such an arrangement can effectively improve the structural strength of the vehicle body floor assembly, and at the same time, compared with the structure in which a cavity is formed inside the rear floor middle cross beam 6 itself, the weight of the entire vehicle can be reduced. Moreover, by arranging the rear floor panel 2c at the bottom of the rear floor middle cross beam 6, compared with the existing structure, there is no need to set an overlap structure at the rear floor middle cross beam 6, that is, no process holes will be generated, which can effectively prevent water from entering the cab. As a further embodiment, the rear floor frame also includes a rear floor front cross beam 5 connected between the rear floor longitudinal beams 4 on both sides. The rear floor front cross beam 5 is located in front of the rear floor middle cross beam 6, and the rear floor front cross beam 5 also forms a cavity with the rear floor panel 2c to improve the structural strength of the vehicle body floor assembly.

[0054] It should be noted that the rear floor front cross beam 5 and the rear floor middle cross beam 6 are all surrounded by the rear floor panel 2c to form a cavity, which is an optimal implementation. Of course, the rear floor front cross beam 5 or the rear floor middle cross beam 6 does not form a cavity with the rear floor panel 2c, but has a cavity inside 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 a closed ring, such as a rectangle.

[0055] As a preferred embodiment, Figure 3 As shown in , a mounting crossbeam 8 is connected between the door sill beams 1 on both sides, and the mounting crossbeam 8 is used to install the front seats. Among them, the mounting crossbeam 8 of this embodiment is specifically two arranged at intervals in the front and rear. In addition, the mounting crossbeam 8 is a uniform cross-section structure and a straight structure extending along the left and right directions of the whole vehicle, so that it can form a force transmission beam that smoothly transmits along the left and right directions of the whole vehicle, and can quickly transmit the collision force. Such a setting can greatly enhance the protection of the battery pack 3 in a side collision and improve the safety performance of the whole vehicle. However, most traditional vehicle body floors 2 have a central channel, and the mounting crossbeam 8 is interrupted and uneven, and the side collision effect is poor, which is not conducive to force transmission and protection of the battery pack 3.

[0056] In addition, if Figure 4 As shown in , the rear floor longitudinal beam 4 of this embodiment includes a front end portion 4a, a rear end portion 4c, and a middle portion 4b disposed between the front end portion 4a and the rear end portion 4c. Moreover, in the vertical direction of the 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 middle portions 4b on both sides to improve the structural strength of the vehicle body floor frame. In addition, the spacing between the sill beams 1 on both sides is generally larger to have a larger cab, which is conducive to improving the riding comfort of the passengers. Here, in order to facilitate the connection between the front end portion 4a and the sill beam 1, as shown in FIG. Figure 2 As shown in FIG. 4 , the distance between the front end portions 4 a on both sides is greater than the distance between the rear end portions 4 c on both sides.

[0057] In this embodiment, in order to further improve the structural strength of the vehicle body floor frame, as shown in FIG. Figure 3 As shown in the figure, a rear floor rear cross beam 7 is connected between the rear floor longitudinal beams 4 on both sides. The number of the rear floor rear cross beams 7 is not limited to the one shown in the figure, and it can be adjusted accordingly according to design requirements. Figure 3 and Figure 5 As shown in , 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 provided between the rear floor longitudinal beams 4 on both sides, and the rear reinforcing beam 10 is connected to the extension portion and surrounds and forms a third cavity.

[0058] In this embodiment, by connecting the rear reinforcing beam 10 to the extension part and surrounding a third cavity, the extension part can be prevented from being deformed, thereby improving the sealing effect between the extension part and the battery pack 3. Moreover, in order to further improve the installation firmness of the battery pack 3, in a specific implementation, the rear end of the battery pack 3 can be connected to the extension part and the rear reinforcing beam 10.

[0059] At this time, since the traditional middle floor panel is cancelled, in order to facilitate the installation of the rear seats, as a preferred embodiment, Figures 3 to 5 As shown in FIG, 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 to install the rear seat. And, as a preferred embodiment, in order to reduce the overall weight, as shown in FIG. Figure 4 As shown in , the mounting bracket 9 of this embodiment is in the shape of a plate, and includes a plate body portion extending along the front-rear direction of the entire vehicle, a front flange provided at the front end of the plate body, and a rear flange provided at the rear end of the plate body.

[0060] Still by Figure 4 As shown in the figure, the mounting bracket 9 of the present embodiment is connected to the front cross beam 5 of the rear floor through the front flange, and is connected to the middle cross beam 6 of the rear floor through the rear flange. Therefore, by providing the front flange and the rear flange, it is not only convenient to connect the mounting bracket 9 with the front cross beam 5 of the rear floor and the middle cross beam 6 of the rear floor, but also the mounting bracket 9 can have a good structural strength, thereby ensuring the installation strength of the rear seat.

[0061] Based on the above description, in order to fully improve the sealing performance of the vehicle body floor assembly, as a preferred embodiment, Figure 3 As shown in FIG. 1 , the rear floor longitudinal beam 4 of this embodiment includes an L-shaped main board 401 and a cover plate 402 disposed on the main board 401 near the vehicle exterior. Furthermore, the main board 401 and the cover plate 402 are connected to the rear floor panel 2c and form a fourth cavity extending in the front-rear direction of the vehicle. In addition, in order to facilitate the connection between the main board 401 and the cover plate 402 and the rear floor panel 2c, as shown in FIG. Figure 6 As shown in , the top of the rear cover plate 402 is convex relative to the main board 401, and the bottom of the cover plate 402 is provided with a first flange folded outward. The bottom of the main board 401 is provided with a second flange folded outward. The cover plate 402 is spot-welded to the rear floor panel 2c through the first flange, and the main board 401 is spot-welded to the rear floor panel 2c through the second flange. The first flange and the second flange can make the plates of the rear floor longitudinal beam 4 fully fit together and have a high structural strength.

[0062] In addition, if 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 to say, 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 through 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 can also be integrally formed, that is, the cross-section of the longitudinal rear floor beam 4 is in a "J" 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 panels arranged oppositely in the left-right direction of the whole vehicle, and an intermediate panel arranged between the two rear side panels. Among them, the rear side panels are integrally formed with the front side panel 2a and the front end panel 2b, and the thickness of the rear side panels is greater than that of the intermediate panel, and the rear side panels and the intermediate panel are laser welded together.

[0065] Such a design can not only fully reduce the weight of the rear floor panel 2c, contribute to 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 sheet material used for the rear side panels and the front side panel 2a and the front end panel 2b can be greater than the strength of the sheet material used for the intermediate panel. In addition, to facilitate the connection between the front side panel 2a and the sill beam 1, further, a flange is provided at the edge of the front side panel 2a, and the flange is welded to the sill beam 1. In addition, by setting the flange, it is convenient to apply sealant between the front side panel 2a and the sill beam 1 to seal the gap between the two, and prevent water from entering the cab through the gap between the two.

[0066] As a preferred embodiment, as Figure 4 As shown, the intermediate panel has a convex protruding part 201, the protruding part 201 is located between the middle cross beam 6 of the rear floor and the rear cross beam 7 of the rear floor, and an avoidance space is formed inside the protruding part 201. In this embodiment, by providing the protruding part 201 on the intermediate panel, it can be used to avoid components such as the rear drive motor, and at the same time can also improve the structural strength of the intermediate panel.

[0067] As another preferred embodiment, still by Figure 4As shown in , the middle plate has a concave portion 202, and the concave portion 202 is located behind the rear cross beam 7 of the rear floor. In this embodiment, by making the middle plate have a concave portion 202, it can be used to arrange components such as a spare tire, and at the same time, the structural strength of the middle plate can be improved. Figure 4 As shown in , in order to have a better use effect, in this embodiment, there are both a protruding portion 201 and a recessed portion 202. Of course, according to design requirements, the protruding portion 201 and the recessed portion 202 may not be set.

[0068] The vehicle body floor assembly of this embodiment adopts the above structure. Since there is no overlapping structure of horizontal and longitudinal beams at the bottom of the vehicle body floor 2, the process voids caused by the overlapping can be avoided, which leads to a greater risk of sealing failure. In addition, the abutment of the battery pack 3 with the front side panel 2a, the front end panel 2b and the rear floor panel 2c can improve the sealing effect of the cab and prevent water from entering the cab. Moreover, during the specific implementation, sealant can be further applied to the abutment portion 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 this embodiment is an integrated structure, which can realize the integrated design of the threshold beam 1, can be easy to process and manufacture, improve production efficiency, and also have good structural strength. In addition, the vehicle body floor 2 can form an annular force transmission structure to 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 present embodiment also relates to a vehicle, in which the vehicle body floor 2 assembly as described above is provided.

[0070] The vehicle of this embodiment has all the beneficial effects of the above-mentioned vehicle body floor 2 assembly, which will not be described in detail here.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle body floor assembly, characterized in that: it includes a vehicle body floor skeleton and a vehicle body floor (2) connected to the vehicle body floor skeleton; the vehicle body floor skeleton includes sill beams (1) separately arranged on the left and right sides, a front reinforcing beam (11) connected between the front ends of the sill beams (1) on both sides, and a rear floor skeleton connected to the rear ends of the sill beams (1) on each side; the vehicle body floor (2) includes front side plates (2a) respectively connected to the inner sides of the sill beams (1) on both sides, a front end plate (2b) connected between the front ends of the front side plates (2a) on both sides, and a rear floor panel (2c) connected to the bottom of the rear floor skeleton, and the front reinforcing beam (11) is connected to the front end plate (2b) and encloses a first cavity, and the front side plates (2a), the front end plate (2b) and the rear floor panel (2c) on both sides are all abutted against a battery pack (3) located at the bottom of the vehicle body.

2. The vehicle body floor assembly according to claim 1, characterized in that: the rear floor skeleton includes rear floor longitudinal beams (4) separately arranged on the left and right sides, and a rear floor middle cross beam (6) connected between the rear floor longitudinal beams (4) on both sides; the rear floor middle cross beam (6) is connected to the rear floor panel (2c) and encloses a second cavity arranged in the left - right direction of the whole vehicle.

3. The vehicle body floor assembly according to claim 2, characterized in that: the rear floor panel (2c) has an extended part extending in front of the rear floor middle cross beam (6), and the extended part is abutted against the battery pack (3); a rear reinforcing beam (10) is arranged between the rear floor longitudinal beams (4) on both sides, and the rear reinforcing beam (10) is connected to the extended part and encloses a third cavity.

4. The vehicle body floor assembly according to claim 2, characterized in that: the rear floor skeleton includes a rear floor front cross beam (5) connected between the rear floor longitudinal beams (4) on both sides; an installation bracket (9) is connected between the rear floor front cross beam (5) and the rear floor middle cross beam (6), and the installation bracket (9) is used for installing the rear row seats.

5. The vehicle body floor assembly according to claim 2, characterized in that: the rear floor longitudinal beam (4) includes 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 the up - down direction of the whole vehicle, the height of the front end part (4a) is less than the height of the rear end part (4c), and the rear floor middle cross beam (6) is connected between the intermediate parts (4b) on both sides.

6. The vehicle body floor assembly according to claim 1, characterized in that: the rear floor longitudinal beam (4) includes a main board (401) in an "L" shape and a cover plate (402) arranged on the side of the main board (401) close to the outside of the vehicle; the main board (401), the cover plate (402) and the rear floor panel (2c) are connected and enclose a fourth cavity extending in the front - rear direction of the whole vehicle.

7. The vehicle body floor assembly according to claim 2, characterized in that: The rear floor panel (2c) includes rear side panels arranged oppositely in the left-right direction of the whole vehicle, and an intermediate panel disposed between the two rear side panels; The rear side panels are integrally formed with the front side panel (2a) and the front end panel (2b), and the thickness of the rear side panels is greater than that of the intermediate panel. The rear side panels and the intermediate panel are joined together by laser welding.

8. The vehicle body floor assembly according to claim 7, characterized in that: A rear floor rear cross member (7) is connected between the two rear floor longitudinal beams (4); The intermediate panel has a convex protruding portion (401), the protruding portion (401) is located between the rear floor middle cross member (6) and the rear floor rear cross member (7), and an avoidance space is formed in the protruding portion (401); and / or, The intermediate panel has a concave recessed portion (402), the recessed portion (402) is located behind the rear floor rear cross member (7).

9. The vehicle body floor assembly according to any one of claims 1 to 8, characterized in that: An installation cross member (8) is connected between the two side sill beams (1), and the installation cross member (8) is used for installing the front row seats.

10. A vehicle, characterized in that: The vehicle is provided with the vehicle body floor assembly according to any one of claims 1 to 9.

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