A front floor structure of an electric vehicle and a lower body of a vehicle body having the structure

Abstract

The present invention discloses a front floor structure for an electric vehicle and a vehicle body underbody having the same structure, including a left sill beam and a right sill beam, and a front floor beam bracket is fixed between the left sill beam and the right sill beam. The front floor structure designed by the present invention improves the side pillar collision crashworthiness, the frontal offset collision crashworthiness of the vehicle body and the structural strength of the panel in the foot area of the driver and passengers. The front floor, the front compartment and the rear floor are all manufactured and formed by the process of high-pressure vacuum casting, simplifying the vehicle body underbody originally formed by welding numerous components into an assembled structure of three components. The vehicle body underbody mechanism composed of the integrally die-cast front floor, front compartment and rear floor can be skillfully integrated with the CTB battery box, achieving the technical effects of process simplification, high safety and vehicle lightweighting.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle structures, and particularly to a front floor structure of an electric vehicle and a lower body of a vehicle body having such a structure. Background Art

[0002] The existing front floor of an electric vehicle is usually formed by an integral die-casting process. A patent with the application number 202210768817.8 and the title "A Front Floor Structure of an Electric Vehicle and an Electric Vehicle Comprising the Front Floor Structure" discloses a front floor structure of an electric vehicle and an electric vehicle comprising the front floor structure, which includes a floor body, a middle channel, a seat crossbeam, a floor longitudinal beam, a sill beam, a front baffle lower crossbeam, and a middle floor crossbeam integrally formed by high-pressure die-casting. The middle channel is arranged at the middle position of the floor body along the length direction of the vehicle body, the sill beams are arranged on both sides of the floor body along the length direction of the vehicle body, the front baffle lower crossbeam is arranged at the front end of the floor body along the width direction of the vehicle body, the middle floor crossbeam is arranged at the rear end of the floor body along the width direction of the vehicle body, and the seat crossbeam is arranged at the middle position of the floor body along the width direction of the vehicle body.

[0003] The current design of the front floor structure of an electric vehicle does not consider the crashworthiness of side pole collisions, does not consider the crashworthiness of frontal offset collisions, nor does it consider the structural strength of the footrest area of the vehicle body floor, resulting in the front floor structure of the electric vehicle not meeting the structural strength requirements. At the same time, the structure of the existing integral front floor of an electric vehicle also does not consider the matching degree with the CTB battery box and cannot ensure the sealing between the battery box and the vehicle body floor. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies of the above background art, and provide a front floor structure of an electric vehicle and a lower body of a vehicle body having such a structure, which can effectively improve the crashworthiness of vehicle pole collisions, frontal offset collision crashworthiness, and the structural strength of the footrest area of the vehicle body floor, and can be matched with the CTB battery box to ensure the sealing between the battery box and the vehicle body floor.

[0005] To achieve this purpose, the front floor structure of the electric vehicle designed by the present invention includes a left sill beam and a right sill beam. A front floor beam bracket is fixed between the left sill beam and the right sill beam. The front floor beam bracket includes a middle channel beam located in the middle of the vehicle body and arranged along the length direction of the vehicle body. Between the inner side of the front part of the middle channel beam and the inner sides of the front parts of the left sill beam and the right sill beam, a left front bracket and a right front bracket for improving the frontal offset collision performance of the vehicle and the structural strength of the front row footrest area are respectively fixedly connected. Between the middle part of the middle channel beam and the inner sides of the middle parts of the left sill beam and the right sill beam, a left middle bracket and a right middle bracket for improving the side pillar collision performance of the vehicle are respectively fixedly connected. Between the rear end of the middle channel beam and the inner sides of the rear parts of the left sill beam and the right sill beam, a rear bracket for improving the structural strength of the rear row footrest area is fixedly connected.

[0006] Further, the left front bracket includes a driver's seat front cross beam vertically and fixedly connected between the left front surface of the middle channel beam and the inner front surface of the left sill beam, and a left front inclined beam fixedly connected between the front surface of the end of the driver's seat front cross beam close to the middle channel beam and the inner front surface of the left sill beam. The included angle between the left front inclined beam and the driver's seat front cross beam is an acute angle. The left front bracket is designed based on the middle channel beam and fixedly connected to the middle channel beam as an integral structure, with high structural strength, and can be formed by integral die casting, with low cost.

[0007] Further, the right front bracket includes a co-driver's seat front cross beam vertically and fixedly connected between the right front surface of the middle channel beam and the inner front surface of the right sill beam, and a right front inclined beam fixedly connected between the front surface of the end of the co-driver's seat front cross beam close to the middle channel beam and the inner front surface of the right sill beam. The included angle between the right front inclined beam and the co-driver's seat front cross beam is an acute angle. The right front bracket is designed based on the middle channel beam and fixedly connected to the middle channel beam as an integral structure, with high structural strength, and can be formed by integral die casting, with low cost.

[0008] The left front bracket and the right front bracket are symmetrically arranged with respect to the middle channel beam, further improving the structural strength of the lower body of the vehicle body.

[0009] Furthermore, the left middle bracket includes a rear crossbeam of the driver's seat vertically and fixedly connected between the middle surface of the left side of the middle channel beam and the inner middle surface of the left sill beam, and a left rear inclined beam fixedly connected between the front surface of the side of the rear crossbeam of the driver's seat close to the middle channel beam and the inner middle surface of the left sill beam. The included angle between the left rear inclined beam and the rear crossbeam of the driver's seat is an acute angle. The left middle bracket is designed based on the middle channel beam and fixedly connected to the middle channel beam as an integral structure, with high structural strength, and can be integrally die-cast, resulting in low costs.

[0010] Furthermore, the right middle bracket includes a rear crossbeam of the co-driver's seat vertically and fixedly connected between the middle surface of the right side of the middle channel beam and the inner middle surface of the right sill beam, and a right rear inclined beam fixedly connected between the front surface of the side of the rear crossbeam of the co-driver's seat close to the middle channel beam and the inner middle surface of the right sill beam. The included angle between the right rear inclined beam and the rear crossbeam of the co-driver's seat is an acute angle. The right middle bracket is designed based on the middle channel beam and fixedly connected to the middle channel beam as an integral structure, with high structural strength, and can be integrally die-cast, resulting in low costs.

[0011] The left middle bracket and the right middle bracket are symmetrically arranged with respect to the middle channel beam, further enhancing the structural strength of the lower body of the vehicle. At the same time, there is a certain gap between the middle bracket and the front bracket, and the structures do not interfere with each other, with a reasonable design.

[0012] Furthermore, the rear bracket includes a rear crossbeam of the front floor that is vertically and fixedly connected to the rear end of the middle channel beam as an integral structure, and the left and right end surfaces are respectively fixedly connected to the inner rear surfaces of the left sill beam and the right sill beam. The structure of the rear bracket is simple, designed based on the middle channel beam and fixedly connected to the middle channel beam as an integral structure, with high structural strength, and can be integrally die-cast, resulting in low costs.

[0013] Furthermore, the middle channel beam is a wedge-shaped structure with a higher front end and a lower rear end. By reasonably designing the structure of the middle channel beam, the structural strength of the middle channel beam is further improved.

[0014] Furthermore, the bottom surfaces of the middle channel beam, the left front bracket, the right front bracket, the left middle bracket, the right middle bracket, and the rear bracket are all located on the same plane. This ensures the flatness of the bottom surface of the lower body of the vehicle, improves the structural rationality, and further ensures the uniform distribution of the force on the lower body.

[0015] Further, a vehicle body underbody having the above-described electric vehicle front floor structure includes a front cabin fixed to the front part of the electric vehicle front floor structure and a rear floor fixed to the rear part of the electric vehicle front floor structure; a sealing edge that overlaps with the edge of the battery box upper cover is fixed to the bottom of the electric vehicle front floor structure, the bottom of the front cabin on the side close to the electric vehicle front floor structure, and the bottom of the rear floor on the side close to the electric vehicle front floor structure.

[0016] Still further, the sealing edge includes a left-side sealing edge fixed to the bottom of the left sill beam and arranged along the length direction of the left sill beam; a right-side sealing edge fixed to the bottom of the right sill beam and arranged along the length direction of the right sill beam; a front-side sealing edge fixed to the bottom of the front cabin on the side close to the electric vehicle front floor structure, perpendicular to the left-side sealing edge and the right-side sealing edge, and having two ends respectively overlapping with the left-side sealing edge and the right-side sealing edge; and a rear-side sealing edge fixed to the bottom of the rear floor on the side close to the electric vehicle front floor structure, perpendicular to the left-side sealing edge and the right-side sealing edge, and having two ends respectively overlapping with the left-side sealing edge and the right-side sealing edge. The present invention designs the sealing edge based on the vehicle body underbody, which fits with the edge of the battery box upper cover and has a high matching degree with the CTB battery box, effectively ensuring the sealing between the battery box and the vehicle body floor.

[0017] The beneficial effects of the present invention are as follows: The front floor structure designed by the present invention improves the side pillar collision crashworthiness, frontal offset collision crashworthiness of the vehicle body and the structural strength of the foot area panel for the driver and passengers. The front floor, the front cabin and the rear floor are all formed by high-pressure vacuum casting process, simplifying the vehicle body underbody originally formed by welding numerous components into an assembly structure of three components. The vehicle body underbody mechanism composed of the integrally die-cast front floor, front cabin and rear floor can be ingeniously integrated with the CTB battery box, achieving the technical effects of process simplification, high safety and vehicle lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the electric vehicle front floor structure in the present invention;

[0019] Figure 2 It is a three-dimensional view of the vehicle body underbody having the electric vehicle front floor structure in the present invention Figure 1 ;

[0020] Figure 3 It is a three-dimensional view of the vehicle body underbody having the electric vehicle front floor structure in the present invention Figure 2 ;

[0021] Among them, 1 - left sill beam, 2 - right sill beam, 3 - center tunnel beam, 4 - front cross beam in front of the driver's seat, 5 - left front inclined beam, 6 - front cross beam in front of the co-driver's seat, 7 - right front inclined beam, 8 - rear cross beam behind the driver's seat, 9 - left rear inclined beam, 10 - rear cross beam behind the co-driver's seat, 11 - right rear inclined beam, 12 - rear cross beam of the front floor, 13 - front cabin, 14 - rear floor, 15 - left side sealing edge, 16 - right side sealing edge, 17 - front side sealing edge, 18 - rear side sealing edge. Detailed implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] As Figure 1 shown in [FIGURE REFERENCE] is an embodiment of the front floor structure of an electric vehicle designed by the present invention, including a left sill beam 1 and a right sill beam 2. A front floor beam bracket is fixed between the left sill beam 1 and the right sill beam 2. The front floor beam bracket includes a center tunnel beam 3 located in the middle of the vehicle body and arranged along the length direction of the vehicle body; a left front bracket and a right front bracket for improving the frontal offset collision performance of the vehicle and the structural strength of the front row footwell area are symmetrically and fixedly connected between the inner sides of the front parts of the center tunnel beam 3 and the left sill beam 1 and the right sill beam 2 respectively; a left middle bracket and a right middle bracket for improving the side pole collision performance of the vehicle are symmetrically and fixedly connected between the inner sides of the middle parts of the center tunnel beam 3 and the left sill beam 1 and the right sill beam 2 respectively; a rear bracket for improving the structural strength of the rear row footwell area is fixedly connected between the inner sides of the rear parts of the center tunnel beam 3 and the left sill beam 1 and the right sill beam 2.

[0024] As Figure 1 —3 shows an embodiment of a left front bracket of the present invention. The left front bracket includes a front cross beam 4 in front of the driver's seat vertically and fixedly connected between the left front surface of the center tunnel beam 3 and the inner front surface of the left sill beam 1, and a left front inclined beam 5 fixedly connected between the front surface of one end of the front cross beam 4 in front of the driver's seat close to the center tunnel beam 3 and the inner front surface of the left sill beam 1. The included angle between the left front inclined beam 5 and the front cross beam 4 in front of the driver's seat is an acute angle.

[0025] Figure 1—3 shows an embodiment of a right front bracket of the present invention. The right front bracket includes a front cross beam 6 for the co-driver's seat vertically and fixedly connected between the front surface of the right part of the middle channel beam 3 and the inner front surface of the right sill beam 2, and a right front inclined beam 7 fixedly connected between the front surface of one end of the front cross beam 6 for the co-driver's seat close to the middle channel beam 3 and the inner front surface of the right sill beam 2. The included angle between the right front inclined beam 7 and the front cross beam 6 for the co-driver's seat is an acute angle.

[0026] Figure 1 —3 shows an embodiment of a left middle bracket of the present invention. The left middle bracket includes a rear cross beam 8 for the driver's seat vertically and fixedly connected between the middle surface of the left side of the middle channel beam 3 and the inner middle surface of the left sill beam 1, and a left rear inclined beam 9 fixedly connected between the front surface of one side of the rear cross beam 8 for the driver's seat close to the middle channel beam 3 and the inner middle surface of the left sill beam 1. The included angle between the left rear inclined beam 9 and the rear cross beam 8 for the driver's seat is an acute angle.

[0027] Figure 1 —3 shows an embodiment of a right middle bracket of the present invention. The right middle bracket includes a rear cross beam 10 for the co-driver's seat vertically and fixedly connected between the middle surface of the right side of the middle channel beam 3 and the inner middle surface of the right sill beam 2, and a right rear inclined beam 11 fixedly connected between the front surface of one side of the rear cross beam 10 for the co-driver's seat close to the middle channel beam 3 and the inner middle surface of the right sill beam 2. The included angle between the right rear inclined beam 11 and the rear cross beam 10 for the co-driver's seat is an acute angle.

[0028] Figure 1 —3 shows an embodiment of a rear bracket of the present invention. The rear bracket includes a front floor rear cross beam 12 whose middle part is vertically and fixedly connected to the rear end of the middle channel beam 3 to form an integral structure, and the left and right end surfaces are respectively fixedly connected to the inner rear surface of the left sill beam 1 and the inner rear surface of the right sill beam 2.

[0029] Figure 2 —3 shows a preferred embodiment of the rear bracket of the present invention. The middle channel beam 3 is a wedge-shaped structure with a high front end and a low rear end. The bottom surfaces of the middle channel beam 3, the left front bracket, the right front bracket, the left middle bracket, the right middle bracket, and the rear bracket are all in the same plane.

[0030] In the present invention, the number of the front inclined beam and the rear inclined beam can be designed according to the needs of structural strength, and is preferably designed to be symmetrically arranged with respect to the middle channel beam.

[0031] Figure 2As shown in FIG. 3, an embodiment of the vehicle body underbody having the above-mentioned electric vehicle front floor structure includes a front cabin 13 fixed to the front part of the electric vehicle front floor structure and a rear floor 14 fixed to the rear part of the electric vehicle front floor structure; a sealing edge overlapping with the edge of the battery box upper cover is fixed to the bottom of the electric vehicle front floor structure, the bottom of the front cabin 13 on the side close to the electric vehicle front floor structure, and the bottom of the rear floor 14 on the side close to the electric vehicle front floor structure. Figure 3 As shown in a preferred embodiment of the sealing edge designed by the present invention, the sealing edge includes a left-side sealing edge 15 fixed to the bottom of the left sill beam 1 and arranged along the length direction of the left sill beam 1; a right-side sealing edge 16 fixed to the bottom of the right sill beam 2 and arranged along the length direction of the right sill beam 2; a front-side sealing edge 17 fixed to the bottom of the front cabin 13 on the side close to the electric vehicle front floor structure, perpendicular to the left-side sealing edge 15 and the right-side sealing edge 16 and having both ends respectively overlapping with the left-side sealing edge 15 and the right-side sealing edge 16; and a rear-side sealing edge 18 fixed to the bottom of the rear floor 14 on the side close to the electric vehicle front floor structure, perpendicular to the left-side sealing edge 15 and the right-side sealing edge 16 and having both ends respectively overlapping with the left-side sealing edge 15 and the right-side sealing edge 16.

[0032] In the present invention, for the front inclined beam connecting the sill beam and the front seat cross beam, the area where it is connected to the sill beam is exactly the bottom end of the A-pillar, and the front seat cross beam, the front inclined beam and the sill beam form a stable triangular structure. When a frontal offset collision occurs, the deformation of the bottom end of the A-pillar is directly resisted by the front inclined beam. Therefore, the design of the front inclined beam can effectively improve the crashworthiness of the frontal offset collision. The front inclined beam connecting the sill beam and the front seat cross beam is located at the footrest area of the driver and the co-driver. Since its height does not affect the foot space of the driver and the co-driver, it can effectively strengthen the structural strength of the footrest panel of the driver and the co-driver.

[0033] For the rear inclined beam connecting the sill beam and the rear seat cross beam, the area where it is connected to the sill beam is exactly the area where it contacts the pillar during a side pillar collision, and the rear seat cross beam, the rear inclined beam and the sill beam form a stable triangular structure. When the contact point of the pillar collision deforms, it is directly resisted by the rear inclined beam. Therefore, the design of the rear inclined beam can effectively improve the crashworthiness of the side pillar collision.

[0034] In addition, although the structure of the rear cross beam 12 of the front floor is of low height, it can also achieve the effect of strengthening the footrest area of the rear passengers. And the middle part of the rear cross beam 12 of the front floor is connected to the middle channel beam 3 to achieve the effect of mutual strengthening.

[0035] Furthermore, the connection between the front floor and the front cabin 13 and the rear floor 14 adopts a variety of connection schemes such as bolt connection, riveting, Mig welding, etc., achieving a high-strength connection effect and rationalization of the connection process. In addition, the bottom inner edge of the front floor sill beam, the bottom rear edge of the front cabin 13, and the bottom front edge of the rear floor 14 are all provided with sealing edges that match the edge of the battery box upper cover. After the battery box is installed, its strength and sealing performance can meet the target requirements. The front floor is formed by high-pressure vacuum casting, which is realized by the scheme of upper and lower and left and right demolding, but the mold is larger than the rear floor 14 and the front cabin 13. The main structure of the one-piece die-cast front floor is composed of a sill beam, a seat crossbeam, an inclined beam, a front floor rear crossbeam 12 and a middle channel beam 3. It does not contain a front floor panel, which is more conducive to the process molding of die-cast parts. The front floor panel is integrated into the upper shell of the battery box, which is also beneficial to the processability of the battery box shell.

[0036] The front floor structure designed by the present invention improves the crash resistance of the side column collision of the vehicle body, the front offset collision crash resistance and the structural strength of the panel in the driver and passenger footrest area. The front floor, front compartment 13 and rear floor 14 are all manufactured and formed by a high-pressure vacuum casting process, which simplifies the underbody of the vehicle body originally welded together with many parts into an assembly structure of three parts. The underbody structure composed of the integrated die-cast front floor, front compartment 13 and rear floor 14 can be cleverly integrated with the CTB (Cell to Body, which means that the battery cell is directly installed on the vehicle body, and the vehicle body floor panel and the upper shell of the battery pack are combined into one) battery box, achieving the technical effects of simplified process, high safety and lightweight vehicle.

[0037] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be construed as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall be deemed to belong to the protection scope of the present invention.

Claims

1. A front floor structure of an electric vehicle, comprising a left sill beam (1) and a right sill beam (2), characterized in that: A front floor beam bracket is fixed between the left sill beam (1) and the right sill beam (2). The front floor beam bracket includes a center tunnel beam (3) located in the middle of the vehicle body and arranged along the length direction of the vehicle body. Left front brackets and right front brackets for improving the vehicle's frontal offset collision performance and the structural strength of the front row footwell area are respectively and fixedly connected between the inner side of the front part of the center tunnel beam (3) and the front parts of the left sill beam (1) and the inner side of the front part of the right sill beam (2). Left middle brackets and right middle brackets for improving the vehicle's side pole impact performance are respectively and fixedly connected between the middle part of the center tunnel beam (3) and the inner side of the middle part of the left sill beam (1) and the inner side of the middle part of the right sill beam (2). A rear bracket for improving the structural strength of the rear row footwell area is fixedly connected between the rear end of the center tunnel beam (3) and the inner side of the rear part of the left sill beam (1) and the inner side of the rear part of the right sill beam (2). The left front bracket includes a driver's seat front cross beam (4) vertically and fixedly connected between the left front surface of the center tunnel beam (3) and the inner front surface of the left sill beam (1), and a left front inclined beam (5) fixedly connected between the front surface of one end of the driver's seat front cross beam (4) close to the center tunnel beam (3) and the inner front surface of the left sill beam (1). The included angle between the left front inclined beam (5) and the driver's seat front cross beam (4) is an acute angle. The right front bracket includes a co-driver's seat front cross beam (6) vertically and fixedly connected between the right front surface of the center tunnel beam (3) and the inner front surface of the right sill beam (2), and a right front inclined beam (7) fixedly connected between the front surface of one end of the co-driver's seat front cross beam (6) close to the center tunnel beam (3) and the inner front surface of the right sill beam (2). The included angle between the right front inclined beam (7) and the co-driver's seat front cross beam (6) is an acute angle. The left middle bracket includes a driver's seat rear cross beam (8) vertically and fixedly connected between the left middle surface of the center tunnel beam (3) and the inner middle surface of the left sill beam (1), and a left rear inclined beam (9) fixedly connected between the front surface of one side of the driver's seat rear cross beam (8) close to the center tunnel beam (3) and the inner middle surface of the left sill beam (1). The included angle between the left rear inclined beam (9) and the driver's seat rear cross beam (8) is an acute angle. The right middle bracket includes a co-driver's seat rear cross beam (10) vertically and fixedly connected between the right middle surface of the center tunnel beam (3) and the inner middle surface of the right sill beam (2), and a right rear inclined beam (11) fixedly connected between the front surface of one side of the co-driver's seat rear cross beam (10) close to the center tunnel beam (3) and the inner middle surface of the right sill beam (2). The included angle between the right rear inclined beam (11) and the co-driver's seat rear cross beam (10) is an acute angle. The rear bracket includes a front floor rear crossbeam (12) whose middle part is vertically and fixedly connected to the rear end of the middle channel beam (3) as an integral structure, and the left and right end surfaces are respectively fixedly connected to the inner rear surface of the left sill beam (1) and the inner rear surface of the right sill beam (2). The left front bracket, the right front bracket, the left middle bracket, the right middle bracket and the rear bracket are integrally die-cast with the middle channel beam (3).

2. The front floor structure of the electric vehicle according to claim 1, wherein: The middle channel beam (3) is a wedge-shaped structure with a high front end and a low rear end.

3. The front floor structure of an electric vehicle according to claim 1, characterized in that: The bottom surfaces of the middle channel beam (3), the left front bracket, the right front bracket, the left middle bracket, the right middle bracket and the rear bracket are all in the same plane.

4. A vehicle body underbody having the electric vehicle front floor structure according to any one of the above claims 1 - 3, characterized in that: It includes a front cabin (13) fixed to the front part of the electric vehicle front floor structure and a rear floor (14) fixed to the rear part of the electric vehicle front floor structure; seals are fixed to the bottom of the electric vehicle front floor structure, the bottom of the front cabin (13) on the side close to the electric vehicle front floor structure, and the bottom of the rear floor (14) on the side close to the electric vehicle front floor structure, and these seals overlap with the edge of the battery box upper cover.

5. The vehicle body underbody of the front floor structure of an electric vehicle according to claim 4, characterized in that: The seal includes a left-side seal edge (15) fixed to the bottom of the left sill beam (1) and arranged along the length direction of the left sill beam (1); a right-side seal edge (16) fixed to the bottom of the right sill beam (2) and arranged along the length direction of the right sill beam (2); a front-side seal edge (17) fixed to the bottom of the front cabin (13) on the side close to the electric vehicle front floor structure, perpendicular to the left-side seal edge (15) and the right-side seal edge (16) and overlapping with the left-side seal edge (15) and the right-side seal edge (16) at both ends; and a rear-side seal edge (18) fixed to the bottom of the rear floor (14) on the side close to the electric vehicle front floor structure, perpendicular to the left-side seal edge (15) and the right-side seal edge (16) and overlapping with the left-side seal edge (15) and the right-side seal edge (16) at both ends.

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