Floor structure, vehicle body structure and electric vehicle

Abstract

The invention belongs to the technical field of vehicle body design, and particularly relates to a floor structure, a vehicle body structure and an electric vehicle. The floor structure is used for the vehicle and comprises a bottom plate, two doorsill beams, a plurality of seat cross beams and at least one expansion beam, the two doorsill beams are arranged on the two sides of the bottom plate at intervals, the seat cross beams are arranged on the bottom plate in the extending direction of the doorsill beams at intervals, and the two ends of each seat cross beam are connected with the two doorsill beams respectively. An expansion beam is arranged on the side, away from the seat cross beam, of the bottom plate, and the two ends of the expansion beam are connected with the two threshold beams correspondingly. By applying the technical scheme, the problem of how to effectively protect passengers in the front row when a side column collision accident occurs is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle body design, and in particular relates to a floor structure, a vehicle body structure and an electric vehicle. Background Art

[0002] CTC battery technology, also known as battery-chassis integration technology (CTC, short for Cell to Chassis), is a technology that integrates the battery, chassis, and lower body, aiming to simplify product design and production processes. CTC battery technology improves space utilization by placing the battery directly in the vehicle chassis, thereby increasing the battery's energy density and being able to expand the battery's volume, thereby increasing the volumetric energy density and improving the range. In addition, CTC battery technology reduces the number of chassis components, reduces the structural cost of the chassis, and thus reduces the total cost of the vehicle.

[0003] In the related art, the body structure designed based on CTC battery technology integrates the installation of batteries in the chassis to avoid interference with the battery installation, and thus the beam reinforcement structure used to enhance the chassis strength is correspondingly reduced, which results in a relative decrease in the strength of the body structure. In the event of a vehicle collision, especially an accident involving a side pillar collision on the side of the vehicle corresponding to the front seat (a side pillar collision refers to a collision between the side of the vehicle and a pillar), the impact energy of the side pillar collision is basically concentrated in the floor structure corresponding to the front seat of the body structure, and the first impact is on the sill beam of the floor structure. Since the strength of the body structure designed using CTC battery technology is relatively reduced, this will directly affect the personal safety of the front seat passengers, and will also affect the safety of the battery. Summary of the Invention

[0004] The purpose of this application is to provide a floor structure, a body structure and an electric vehicle, aiming to solve the problem of how to effectively protect the personal safety of front-seat passengers and battery safety in the event of a side-column collision.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, the technical solution adopted in the present application is: a floor structure for a vehicle, the floor structure comprising a bottom plate, two door sill beams, a plurality of seat cross beams and at least one expansion beam, the two door sill beams being spaced apart on both sides of the bottom plate, a plurality of seat cross beams being spaced apart on the bottom plate along the extension direction of the door sill beams, the two ends of the seat cross beam being respectively connected to the two door sill beams, an expansion beam being provided on the side of the bottom plate facing away from the seat cross beam, the two ends of the expansion beam being respectively connected to the two door sill beams.

[0006] The floor structure designed and provided in this application, when assembled onto a vehicle chassis, is a key component of the vehicle. The floor panel, two sill beams, and multiple seat crossbeams form the main frame of the floor structure. Compared to floor structures in related art, this floor structure incorporates at least one expansion beam, the ends of which are connected to the two sill beams. Thus, in the event of a side-post collision, external impact energy reaches the floor structure during the energy transfer process. The impact energy first acts on the sill beam closest to the collision location, and then is transferred to the floor panel, seat crossbeams, and expansion beams. Compared to floor structures in related art, the addition of at least one expansion beam allows this floor structure to absorb a portion of the impact energy in the event of a side-post collision, thereby distributing the impact energy among the floor panel, sill beams, and seat crossbeams. This effectively reduces the deformation of the floor panel, sill beams, and seat crossbeams during the impact, thereby effectively protecting front-seat passengers in the event of a side-post collision. In addition, the expansion beam is used to assemble the battery, that is, the expansion beam is used to fix and position the battery. The expansion beam provides support for the battery during the installation process of the battery, and the expansion beam can withstand the impact energy in the event of a side column collision, reducing the impact energy acting on the battery, thereby improving the installation stability and safety of the battery.

[0007] In some embodiments of the present application, the extension direction of the seat crossbeam is arranged parallel to the extension direction of the expansion beam. In the event of a side pillar collision, the expansion beam and the seat crossbeam can better withstand the impact energy, thereby protecting the personal safety of the front passengers and protecting the battery safety.

[0008] In some embodiments of the present application, at least a portion of the expansion beam is located within the area confined by the multiple seat cross beams. Thus, in the event of a side-pillar collision, the expansion beam, together with the floor and multiple seat cross beams, can absorb the impact energy, thereby reducing the impact energy from being transferred to the seats, thereby better protecting the safety of front-seat passengers and the battery.

[0009] In some embodiments of the present application, at least one seat crossbeam is positioned directly opposite an expansion beam. In the event of a side-post collision, the opposing seat crossbeam and expansion beam simultaneously absorb the impact energy, reducing the impact energy from being transferred to the seat, thereby better protecting the safety of front-seat occupants and the battery.

[0010] In some embodiments of the present application, the floor structure includes two seat cross beams and an expansion beam. The rear seat cross beam, as viewed in the vehicle's forward direction, is positioned directly opposite the expansion beam. In the event of a side pole collision, the opposing seat cross beam and expansion beam simultaneously absorb the impact energy, reducing its transfer to the seats and thereby better protecting the safety of front-seat occupants and the battery.

[0011] In some embodiments of the present application, the expansion beam and the base plate may be connected by adhesive bonding. This allows the expansion beam to adaptively detach from the base plate when it collapses and deforms due to the impact energy, improving the deformation response of the expansion beam. Furthermore, the expansion beam and the base plate may be connected by at least one of adhesive bonding, welding, and screwing.

[0012] In some embodiments of the present application, the two ends of the expansion beam are respectively fixed to the two threshold beams by bolts, and the expansion beam can be disassembled, so that the battery can be removed and installed conveniently and quickly during subsequent maintenance and repair of the battery; or, the two ends of the expansion beam are respectively welded and fixed to the two threshold beams, so that the expansion beam can be more firmly connected to the two threshold beams.

[0013] In some embodiments of the present application, at least one seat crossbeam includes a beam body and a plurality of beam ribs, the plurality of beam ribs are arranged at intervals on the beam body, the extension direction of each beam rib is consistent with the extension direction of the beam body, and each beam rib is in contact with the bottom plate, which can make the strength of the seat crossbeam higher than that of a general rectangular beam, and can withstand greater impact energy in the event of a side column collision.

[0014] In some embodiments of the present application, at least one seat cross beam includes a beam body, a first beam rib, a second beam rib and a third beam rib, and the first beam rib, the second beam rib and the third beam rib are arranged in sequence on the beam body, and the extension directions of the first beam rib, the second beam rib and the third beam rib are consistent with the extension direction of the beam body, and the first beam rib, the second beam rib and the third beam rib are all in contact with the bottom plate, which can make the strength of the seat cross beam higher than that of a general rectangular beam, and can withstand greater impact energy in the event of a side column collision.

[0015] In some embodiments of the present application, the beam body and the plurality of beam ribs are integrally formed components, so that the seat cross beam has good integrity and high strength.

[0016] In some embodiments of the present application, both ends of the seat cross beam are connected to two door sill beams via joint components respectively.

[0017] In some embodiments of the present application, the joint parts on both ends of the seat cross beam are respectively fixed to the two door sill beams by bolts, so that the seat cross beams are detachable, which is conducive to the installation and adjustment of the seat during subsequent disassembly or modification of the seat; or, the joint parts on both ends of the seat cross beam are respectively welded and fixed to the two door sill beams, so that the seat cross beam is more stable relative to the base plate and the two door sill beams.

[0018] According to a second aspect of the present application, a vehicle body structure is provided. Specifically, the vehicle body structure includes the aforementioned floor structure.

[0019] According to a third aspect of the present application, an electric vehicle is provided. Specifically, the electric vehicle includes the aforementioned body structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic diagram of a floor structure according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 A schematic top view of the floor structure is shown;

[0023] Figure 3 for Figure 1 A bottom view schematically showing the floor structure;

[0024] Figure 4 for Figure 2 Schematic diagram of local cross-section in the AA direction;

[0025] Figure 5 This is a schematic structural diagram of an electric vehicle according to an embodiment of the present application.

[0026] Among them, the reference numerals in the figures are:

[0027] 100. Floor structure;

[0028] 10. Bottom plate;

[0029] 20. Threshold beam;

[0030] 30. Seat crossbeam; 31. Beam body; 32. Beam rib; 321. First beam rib; 322. Second beam rib; 323. Third beam rib;

[0031] 40. Expansion beam;

[0032] 200, battery;

[0033] 300, electric vehicle; 310, vehicle chassis; 320, drive motor; 330, wheels;

[0034] X, the vehicle's forward direction; Y, the extension direction of the seat beam. DETAILED DESCRIPTION

[0035] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 on this application.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0038] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0039] As people's quality of life continues to improve, their use of cars for transportation has gradually increased, driving the continuous development of the automotive industry. New energy electric vehicles have seen particularly significant growth in recent years, encompassing a range of vehicles, including family cars for commuting, buses for short-distance passenger transport, rail trains for long-distance passenger transport, and small trucks for short-distance freight transport. Among these, new energy electric vehicles (hereinafter referred to as electric vehicles, but narrowly defined as family cars for commuting) have seen particularly rapid growth, with their market share increasing year by year.

[0040] Because the body of an electric vehicle needs to undergo adaptive changes to accommodate the assembly layout of the battery and drive motor, this may cause the mechanical strength of the body to decrease, thereby affecting the personal safety of the passengers in the vehicle and the safety of the battery.

[0041] Based on the above considerations, the embodiment of the present application is designed to provide a floor structure for installation on a vehicle chassis, thereby forming a body structure with better mechanical strength than the body structure of an electric vehicle in the related art, and the body structure is used to assemble and form an electric vehicle. In the floor structure of the embodiment of the present application, an expansion beam is additionally provided on the side of the bottom plate away from the seat crossbeam, and the two ends of the expansion beam are respectively connected to the two door sill beams on both sides of the bottom plate. In this way, when the electric vehicle is involved in a side column collision accident, the expansion beam can withstand a portion of the impact energy, thereby helping the bottom plate, door sill beam and seat crossbeam to share the impact energy, effectively reducing the amount of collapse deformation of the bottom plate, door sill beam and seat crossbeam in the process of bearing the impact energy, thereby effectively protecting the personal safety of the front passengers and the safety of the battery.

[0042] like Figures 1 to 4 As shown, the floor structure 100 provided in the embodiment of the present application is designed for installation on a vehicle chassis 310. The floor structure 100 includes a base plate 10, two sill beams 20, multiple seat cross beams 30, and at least one expansion beam 40. The expansion beam 40 is used to mount the battery 200. The two sill beams 20 are spaced apart on either side of the base plate 10. The multiple seat cross beams 30 are spaced apart on the base plate 10 along the extension direction of the sill beams 20. The ends of the seat cross beams 30 are respectively connected to the two sill beams 20. The multiple seat cross beams 30 are used to mount the front seats of the vehicle (i.e., the driver's seat and the passenger seat), that is, the driver's seat is adjacent to one of the sill beams 20, and the passenger seat is adjacent to the other sill beam 20. An expansion beam 40 is provided on the side of the base plate 10 facing away from the seat cross beams 30. The ends of the expansion beam 40 are respectively connected to the two sill beams 20.

[0043] During a side-pillar impact test, the vehicle's side impact area between the A-pillar and the B-pillar is typically tested. In a side-pillar impact, the external impact energy primarily acts on the floor structure 100 corresponding to the front seats. The impact energy first impacts the sill beam 20 of the floor structure 100, and then transfers energy to structural components such as the floor plate 10, the seat cross member 30, and the expansion beam 40.

[0044] The floor structure 100 designed and provided in this application is assembled onto a vehicle chassis 310. Floor structure 100 is a key component of the vehicle. A base plate 10, two sill beams 20, and multiple seat cross beams 30 form the main framework of floor structure 100. Furthermore, compared to floor structures in related art, this floor structure 100 incorporates at least one expansion beam 40, the ends of which are connected to the two sill beams 20. Thus, in the event of a side pole collision, the external impact energy reaches floor structure 100 during the energy transfer process. The impact energy first acts on the sill beam 20 closest to the collision location, and then is transferred to the base plate 10, the seat cross beams 30, and the expansion beams 40. Compared to floor structures in the related art, the addition of at least one expansion beam 40 to this floor structure 100 increases its structural strength. Consequently, the expansion beam 40 can absorb a portion of the impact energy in a side-pillar collision, thereby helping to distribute the impact energy among the floor panel 10, the sill beam 20, and the seat cross member 30. This effectively reduces the deformation of the floor panel 10, the sill beam 20, and the seat cross member 30 during the impact, thereby effectively protecting front-seat passengers in the event of a side-pillar collision. Furthermore, the expansion beam 40 is used to assemble the battery 200, securing and positioning it. During installation, the expansion beam 40 provides support and bears its weight. Furthermore, the expansion beam 40 can absorb the impact energy in a side-pillar collision, reducing the impact energy applied to the battery 200 and improving the installation stability and safety of the battery 200.

[0045] like Figures 1 to 3As shown, in some embodiments of the present application, the extension directions Y of two adjacent seat cross beams are arranged parallel to each other. Furthermore, the extension direction Y of the seat cross beams is arranged parallel to the extension direction of the expansion beam 40. This allows the expansion beam 40 and the seat cross beam 30 to better withstand impact energy. Furthermore, because the expansion beam 40 is connected to the two sill beams 20 at both ends, and the seat cross beam 30 is connected to the two sill beams 20 at both ends, when external impact energy strikes either sill beam 20, the impact energy is transmitted to the floor plate 10 of the floor structure 100 and the seat cross beam 30, causing them to deform and absorb the impact energy as much as possible. When the collision is so severe that even after the bottom plate 10 and the seat cross beam 30 are crushed and deformed, the impact energy is still transmitted to the expansion beam 40, due to the inherent stiffness and mechanical strength of the expansion beam 40, the expansion beam 40 can withstand the transmitted impact energy, thereby controlling the deformation intrusion of the bottom plate 10 and the seat cross beam 30 (that is, reducing the deformation of the bottom plate 10 and the seat cross beam 30), thereby reducing the safety impact on the front passengers and the battery, and better protecting the personal safety of the front passengers and the battery safety.

[0046] In some embodiments of the present application, multiple seat cross beams 30 are spaced apart in sequence along the vehicle's forward direction X, and the spacing between two adjacent seat cross beams 30 can be equal. Thus, along the vehicle's forward direction X, a fixed area is defined between the first and last seat cross beams 30. This area is the area defined by the multiple seat cross beams 30. Furthermore, at least a portion of the expansion beam 40 is located within the area defined by the multiple seat cross beams 30. In this way, compared to a situation where the expansion beam 40 is completely outside the area defined by the multiple seat cross beams 30, the expansion beam 40 can be concentrated together with the floor 10 and the multiple seat cross beams 30 to absorb the impact energy transmitted, better absorbing the impact energy and reducing the impact energy that is further transmitted to the seats, thereby better protecting the safety of front-seat passengers and the battery.

[0047] The phrase “at least a portion of the expansion beam 40 is located within the area limited by the plurality of seat cross beams 30 ” has the following meanings:

[0048] In the first case, when there is only one expansion beam 40, the expansion beam 40 can be completely located within the area restricted by the multiple seat cross beams 30, or a portion of the expansion beam 40 can be located within the area restricted by the multiple seat cross beams 30 (i.e., a portion of the expansion beam 40 overlaps with the area restricted by the multiple seat cross beams 30), and the remaining portion of the expansion beam 40 is located outside the area restricted by the multiple seat cross beams 30. In this case, the expansion beam 40 can be concentrated together with the bottom plate 10 and the multiple seat cross beams 30 to withstand the impact energy transmitted, better withstand the impact energy, thereby reducing the impact energy further transmitted to the seat, thereby better protecting the personal safety of the front passengers and protecting the safety of the battery;

[0049] In the second case, when there are multiple expansion beams 40, all the expansion beams 40 can be located within the area restricted by the multiple seat cross beams 30. In this case, all the expansion beams 40, the bottom plate 10, and the multiple seat cross beams 30 are concentrated together to withstand the impact energy transmitted, better absorbing the impact energy, thereby reducing the impact energy further transmitted to the seat, thereby better protecting the personal safety of the front passengers and protecting the safety of the battery.

[0050] A third scenario is when there are multiple expansion beams 40, and only a portion of one of the expansion beams 40 is located outside the area restricted by the multiple seat cross beams 30. The remaining portion of the expansion beam 40 overlaps with the area restricted by the multiple seat cross beams 30, and all of the remaining expansion beams 40 are located within the area restricted by the multiple seat cross beams 30. In this case, all of the expansion beams 40, the bottom plate 10, and the multiple seat cross beams 30 are concentrated together to absorb the impact energy, better absorbing the impact energy and reducing the impact energy further transmitted to the seats, thereby better protecting the personal safety of the front passengers and protecting the battery safety.

[0051] A fourth situation is that when there are multiple expansion beams 40, a portion of one of the expansion beams 40 is located outside the area restricted by the multiple seat cross beams 30, and the remaining portion of the expansion beam 40 overlaps with the area restricted by the multiple seat cross beams 30. In addition, a portion of the remaining other expansion beams 40 is completely located within the area restricted by the multiple seat cross beams 30, and another portion of the remaining other expansion beams 40 is located outside the area restricted by the multiple seat cross beams 30. In this case, the expansion beams 40 that overlap with the area restricted by the multiple seat cross beams 30 are concentrated together with the bottom plate 10 and the multiple seat cross beams 30 to withstand the transmitted impact energy. The remaining expansion beams 40 that are located outside the area restricted by the multiple seat cross beams 30 (these expansion beams 40 do not overlap with the area restricted by the multiple seat cross beams 30 at all) can also assist in bearing a portion of the transmitted impact energy, thereby better bearing the impact energy and reducing the impact energy that continues to be transmitted to the seats, thereby better protecting the personal safety of the front passengers and protecting the safety of the battery.

[0052] The fifth situation is that when there are multiple expansion beams 40, a part of the expansion beams 40 are located within the area restricted by multiple seat cross beams 30, and the remaining expansion beams 40 are located outside the area restricted by multiple seat cross beams 30. At this time, several expansion beams 40 located in the area restricted by multiple seat cross beams 30 are concentrated together with the bottom plate 10 and multiple seat cross beams 30 to withstand the transmitted impact energy, and the remaining expansion beams 40 can also auxiliaryly withstand part of the transmitted impact energy, thereby better bearing the impact energy and reducing the impact energy from continuing to be transmitted to the seat, so as to better protect the personal safety of the front passengers and protect the battery safety.

[0053] In the embodiments of the present application, Figure 3 and Figure 4 As shown, the floor structure 100 includes an expansion beam 40, which is completely located within the area confined by the multiple seat cross beams 30. Furthermore, the expansion beam 40 is positioned as close as possible to the B-pillar of the vehicle along the vehicle's forward direction X, thereby helping to absorb the impact energy of a side collision as much as possible, thereby reducing the impact energy from being transferred to the seats, thereby protecting the personal safety of passengers and the battery.

[0054] A side collision generally involves a collision with the side area of ​​the vehicle's B-pillar (including the B-pillar, the front door area near the B-pillar, and the rear door area near the B-pillar). When a side collision occurs, the external impact energy primarily acts on the B-pillar, which is then transferred from the B-pillar to the chassis floor structure.

[0055] The following description will be made by taking the floor structure 100 of the present application including an expansion beam 40 as an example.

[0056] In some embodiments of the present application, Figure 4 As shown, at least one seat cross beam 30 is disposed opposite an expansion beam 40. That is, an expansion beam 40 is disposed directly below at least one seat cross beam 30. When the width of the cross section of the seat cross beam 30 perpendicular to the seat cross beam's extension direction Y (i.e., the horizontal width of the seat cross beam 30) is greater than the width of the expansion beam 40, the vertical projection of the seat cross beam 30 overlaps the vertical projection of the expansion beam 40. Furthermore, the extension axis of the seat cross beam 30 and the extension axis of the expansion beam 40 can lie in the same vertical plane. Alternatively, when the width of the cross section of the seat cross beam 30 perpendicular to the seat cross beam's extension direction Y (i.e., the horizontal width of the seat cross beam 30) is less than the width of the expansion beam 40, the vertical projection of the seat cross beam 30 lies within the vertical projection of the expansion beam 40. Furthermore, the extension axis of the seat cross beam 30 and the extension axis of the expansion beam 40 can lie in the same vertical plane. In this way, when the impact energy is transmitted from the sill beam 20 to the floor 10, the expansion beam 40 and the seat cross beam 30, the seat cross beam 30 and the expansion beam 40 that are arranged opposite each other bear the impact energy at the same time, and the floor 10, the expansion beam 40 and all the seat cross beams 30 are concentrated together to bear the transmitted impact energy, thereby better bearing the impact energy and reducing the impact energy from continuing to be transmitted to the seat, so as to better protect the personal safety of the front passengers and protect the safety of the battery.

[0057] In some embodiments of the present application, Figure 2 and Figure 4 As shown, floor structure 100 includes two seat cross beams 30, both extending in parallel, in the Y direction. The rearward seat cross beam 30, located in the vehicle's forward direction X, is positioned directly opposite expansion beam 40. Specifically, expansion beam 40 is positioned as close as possible to the vehicle's B-pillar in the vehicle's forward direction X, thereby maximizing impact energy absorption in a side collision and reducing the amount of energy transferred to the seats, thereby protecting both occupants and the battery.

[0058] The expansion beam 40 not only fixes and positions the battery 200, but also provides support for the battery 200 during installation, thereby improving the stability and safety of the battery 200. During the process of heat generation and heat dissipation by the battery 200, the support provided by the expansion beam 40 to the battery 200 can also limit the thermal expansion of the battery 200, preventing the battery 200 shell from expanding and cracking, which could lead to failure of the shell seal. Furthermore, because the expansion beam 40 limits the thermal expansion of the battery 200, it also limits the outward transmission of the thermal expansion stress of the battery 200, thereby better protecting the integrity and safety of other electrical components in the battery 200.

[0059] The expansion beam 40 and the base plate 10 may be connected by at least one of adhesive connection, welding connection, bolt connection, etc., so that the expansion beam 40 is assembled on the base plate 10 .

[0060] In some embodiments of the present application, the expansion beam 40 is connected to the base plate 10 by at least one of welding connection and bolt connection, wherein welding connection and bolt connection are both hard connection methods, thereby making the expansion beam 40 and the base plate 10 relatively fixedly connected.

[0061] In some embodiments of the present application, to enable the expansion beam 40 to better adapt to the thermal expansion and contraction of the battery 200 during heat generation and cooling, the expansion beam 40 and the base plate 10 may be connected by adhesive. In this way, when the thermal expansion of the battery 200 exceeds a predetermined limit, the expansion beam 40 can adaptively detach from the base plate 10, reducing the force exerted by the thermal expansion of the battery 200 on the base plate 10 and preventing the base plate 10 from being damaged or deformed by the thermally expanded battery 200. Furthermore, the adhesive connection between the expansion beam 40 and the base plate 10 is a soft connection method. In this way, when a side column collision occurs, the external impact energy is transmitted to the door sill beam 20, and then to the base plate 10, the seat cross beam 30 and the expansion beam 40. Due to the adhesive connection between the expansion beam 40 and the base plate 10, compared with the expansion beam 40 being fixed to the base plate 10 by hard connection methods such as welding and bolting, the expansion beam 40 can adaptively separate from the base plate 10 when it is crushed and deformed by the impact energy. The response speed of the expansion beam 40 to deformation is better, thereby quickly reducing the impact energy and continuing to transmit it to the seat, so as to better protect the personal safety of the front passengers and protect the safety of the battery.

[0062] In some embodiments of the present application, the two ends of the expansion beam 40 are respectively fastened to the two door sill beams 20 by bolts. Connecting the two ends of the expansion beam 40 to the two door sill beams 20 by bolting allows the expansion beam 40 to be detachable relative to the two door sill beams 20. Therefore, while the expansion beam 40 helps distribute the impact energy among the floor 10, the door sill beam 20, and the seat cross member 30, it can also be detached, allowing the battery 200 to be quickly and easily removed and installed during subsequent maintenance and repair. Furthermore, the detachable expansion beam 40 facilitates assembly and adjustment of a newly installed battery 200 (it can simultaneously adapt and adjust the expansion beam 40 and the battery 200), allowing the newly installed battery 200 to better fit the vehicle chassis and improve the installation stability and safety of the battery 200.

[0063] In some embodiments of the present application, the two ends of the expansion beam 40 are respectively welded and fixed to the two threshold beams 20. Although the expansion beam 40 of this embodiment cannot be disassembled relative to the two threshold beams 20, compared with the method of connecting the two ends of the expansion beam 40 to the two threshold beams 20 by bolt locking, the method of fixing the two ends of the expansion beam 40 to the two threshold beams 20 by welding allows the expansion beam 40 to be more firmly connected to the two threshold beams 20, avoiding the situation where the bolts loosen after the electric vehicle has been driving for a long time, that is, the expansion beam 40 loosens. When the battery 200 needs to be maintained or repaired, it is only necessary to adjust and install the newly replaced battery 200 relative to the expansion beam 40 to meet the installation stability and safety of the battery 200.

[0064] In some embodiments of the present application, Figure 4 As shown, at least one seat cross member 30 includes a main beam 31 and multiple ribs 32. Together, these components provide the seat cross member 30 with greater strength than conventional rectangular beams, enabling it to withstand greater impact energy. In this seat cross member 30, multiple ribs 32 are spaced apart from the main beam 31. Each rib 32 extends in the same direction as the main beam 31 (the direction in which the main beam 31 and each rib 32 extend corresponds to the seat cross member's extension direction Y). Each rib 32 contacts the base plate 10.

[0065] Specifically, in some embodiments of the present application, all seat cross beams 30 include a beam body 31 and multiple beam ribs 32. Thus, by utilizing the higher-strength seat cross beams 30 in the floor structure 100, the overall strength of the floor structure 100 is enhanced. In the event of a side pole collision, external impact energy is transferred to the floor structure 100, and the higher-strength floor structure 100 can withstand greater impact energy. Consequently, when the sill beam 20, floor panel 10, seat cross beam 30, and expansion beam 40 are subjected to impact energy, the overall strength of the floor structure 100 is enhanced due to the high-strength seat cross beams 30. Consequently, the overall collapse deformation of the floor structure 100 is minimized, significantly reducing the impact energy transferred to the seats and thus affecting the front-seat occupants, thereby effectively protecting the safety of the front-seat occupants and the battery.

[0066] In some embodiments of the present application, Figure 4 As shown, at least one seat cross member 30 includes a main body 31, a first rib 321, a second rib 322, and a third rib 323. The first rib 321, the second rib 322, and the third rib 323 are sequentially spaced apart on the main body 31. That is, the cross-sectional shape of the seat cross member 30, which is composed of the main body 31, the first rib 321, the second rib 322, and the third rib 323, perpendicular to the direction of extension of the seat cross member, is M-shaped. The first rib 321, the second rib 322, and the third rib 323 all extend in the same direction as the main body 31 (the direction of extension of the main body 31, the first rib 321, the second rib 322, and the third rib 323 is the direction of extension Y of the seat cross member). The first rib 321, the second rib 322, and the third rib 323 all contact the base plate 10.

[0067] Specifically, in some embodiments of the present application, all seat cross beams 30 have an M-shaped cross section, consisting of a beam body 31, a first beam rib 321, a second beam rib 322, and a third beam rib 323. The M-shaped cross beam 30 is stronger than a typical rectangular beam. Thus, the floor structure 100 utilizes the stronger M-shaped cross beam 30, thereby improving the overall strength of the floor structure 100. In the event of a side pole collision, the external impact energy is transferred to the floor structure 100, and the higher strength of the floor structure 100 can withstand the greater impact energy. Thus, when the rocker beam 20, floor panel 10, seat cross member 30, and expansion beam 40 are subjected to impact energy, the overall strength of the floor structure 100 is improved due to the use of the high-strength seat cross member 30 with an M-shaped cross section. Consequently, the overall crushing deformation of the floor structure 100 is relatively small, significantly reducing the impact energy that can be transmitted to the seat and thus act on the front-seat occupants, thereby effectively protecting the safety of the front-seat occupants and the battery.

[0068] In some embodiments of the present application, the beam body 31 and the plurality of beam ribs 32 are integrally formed components. Specifically, the seat cross member 30 is formed as a single piece, ensuring good integrity and high strength. This allows the seat cross member 30 to withstand greater impact energy, minimizing the overall collapse deformation of the floor structure 100 and significantly reducing the impact energy transmitted to the seats and affecting the front-seat occupants. This effectively protects the safety of the front-seat occupants and the battery.

[0069] Specifically, in some embodiments of the present application, the integrally formed seat cross member 30 is a forged cross member formed integrally through a forging process, or is made of high-strength steel through a hot forming process. This provides the seat cross member 30 with excellent mechanical strength and other mechanical properties, enabling it to withstand greater impact energy, thereby significantly improving the overall strength of the floor structure 100. In the event of a side pole collision, the external impact energy is transmitted to the floor structure 100. The higher strength of the floor structure 100 can withstand greater impact energy, and the overall crushing deformation of the floor structure 100 is smaller, significantly reducing the impact energy that can be transmitted to the seat and act on the front passengers, thereby effectively protecting the personal safety of the front passengers and the battery.

[0070] Alternatively, in some embodiments of the present application, the integrally formed seat cross member 30 may be cast using a casting process, i.e., the seat cross member 30 is a cast cross member. The mechanical strength of the cast seat cross member 30 can substantially meet the strength requirements of the floor structure 100 to withstand the impact energy of a side pillar collision, effectively reducing the impact energy that can be transmitted to the seat and act on the front seat occupants, thereby protecting the personal safety of the front seat occupants and the battery.

[0071] Forging is a processing method that uses a forging machine to apply pressure to a metal blank, causing it to plastically deform and produce forgings with specific mechanical properties, shapes, and sizes. This process eliminates defects such as as-cast porosity that occur during the smelting process, optimizes the microstructure, and, by preserving the integrity of the metal flow lines, generally results in forgings with superior mechanical properties compared to castings made of the same metal. Therefore, forgings are often used for critical parts in related machinery and equipment that are subject to high loads and harsh working conditions.

[0072] Therefore, in the embodiment of the present application, the seat cross member 30 is preferably a forged cross member formed integrally through a forging process. This ensures that the seat cross member 30 has excellent mechanical strength and other mechanical properties, allowing it to withstand greater impact energy, thereby significantly improving the overall strength of the floor structure 100. In the event of a side pole collision, the external impact energy is transmitted to the floor structure 100. The higher strength of the floor structure 100 can withstand greater impact energy, and the overall crushing deformation of the floor structure 100 is relatively small, significantly reducing the impact energy that can be transmitted to the seat and thus act on the front seat occupants, thereby effectively protecting the personal safety of the front seat occupants and the battery.

[0073] In some embodiments of the present application, both ends of the seat cross beam 30 are respectively connected and fixed to the two door sill beams 20 via joint components. By connecting both ends of the seat cross beam 30 to the two door sill beams 20 via joint components, the connection convenience of the seat cross beam 30 can be improved, thereby improving assembly efficiency.

[0074] Specifically, the joint components include, but are not limited to, flange joints. Flange joints are fixedly connected to both ends of the seat cross member 30, and the flange joints are then fixedly connected to the door sill beam 20. Alternatively, the joint components can be folded edge panels at the ends of the seat cross member 30, which can achieve the same connection effect as the flange joints.

[0075] In some embodiments of the present application, the connector components at both ends of the seat crossbeam 30 are bolted to the two door sill beams 20. Furthermore, the seat crossbeam 30 is secured to the base plate 10 via multiple bolts, which are spaced apart along the seat crossbeam's extension direction Y, with equal spacing between adjacent bolts. Bolting the seat crossbeam 30 to the base plate 10 and the connector components to the door sill beams 20 via bolts makes the seat crossbeam 30 removable, facilitating seat installation and adjustment during subsequent disassembly or modification.

[0076] In other embodiments of the present application, the joint components on both ends of the seat crossbeam 30 can also be fixedly connected to the two door sill beams 20 by riveting. Accordingly, the seat crossbeam 30 is fixedly connected to the base plate 10 by riveting. In addition, a plurality of rivets are arranged in sequence along the extension direction Y of the seat crossbeam, and the intervals between two adjacent rivets are equal. Compared with connecting the seat crossbeam 30 to the base plate 10 by bolting and connecting and fixing the joint components to the door sill beams 20 by bolting, this embodiment connects the seat crossbeam 30 to the base plate 10 and connects the joint components to the door sill beams 20 by riveting, making the seat crossbeam 30 more stable relative to the base plate 10 and the two door sill beams 20, and avoiding the situation where the bolts loosen after the electric vehicle has been driving for a long time, that is, the seat crossbeam 30 becomes loose.

[0077] In some embodiments of the present application, the joint components at both ends of the seat crossbeam 30 are welded to the two door sill beams 20, respectively. Furthermore, the seat crossbeam 30 is welded to the base plate 10. In this embodiment, the seat crossbeam 30 is spot welded to the base plate 10, and the welds between the seat crossbeam 30 and the base plate 10 are spaced apart along the seat crossbeam's extension direction Y, with the spacing between adjacent welds being equal. Compared to bolting or riveting the seat crossbeam 30 to the base plate 10 and the joint components to the door sill beams 20, this embodiment welds the seat crossbeam 30 to the base plate 10 and the joint components to the door sill beams 20, allowing the seat crossbeam 30 to be quickly connected to the base plate 10 and the two door sill beams 20, thereby improving assembly efficiency. Moreover, compared with connecting the seat cross beam 30 to the bottom plate 10 and connecting the joint component to the door sill beam 20 by bolt connection, welding makes the seat cross beam 30 more stable relative to the bottom plate 10 and the two door sill beams 20, thereby avoiding the situation where the bolts become loose after the electric vehicle has been running for a long time, that is, the seat cross beam 30 becomes loose.

[0078] According to a second aspect of the present application, a vehicle body structure is provided. Specifically, the vehicle body structure includes the aforementioned floor structure 100.

[0079] Vehicle body structures are categorized as either monocoque or non-monocoque. For example, a typical four-door, five-seat sedan has three-box, four-door, and five-door family cars. The A-pillars are the two pillars between the windshield and the left front door, and the right front door, respectively. The B-pillars are the longitudinal pillars between the front and rear seats, extending from the roof to the floor. From the inside, the front seat belts are mounted on the B-pillars. The C-pillars are located on either side of the rear seats. These pillars are the primary support for the vehicle's structural strength. In a side pole collision, the impact energy primarily impacts the floor structure 100 corresponding to the front seats, initially impacting the sill beam 20. The energy is then transferred to structural components of the floor structure 100, such as the floor pan 10, seat crossbeam 30, and expansion beam 40.

[0080] The vehicle body structure is assembled using the floor structure 100 provided by the embodiment of the present application. In the event of a side-pillar collision, the external impact energy first acts on the rocker beam 20 closest to the collision location, and then is transferred to the floor panel 10, the seat cross member 30, and the expansion beam 40. Compared to floor structures in related art, the floor structure 100 includes at least one expansion beam 40. Therefore, the expansion beam 40 can absorb a portion of the impact energy in the event of a side-pillar collision, thereby helping to distribute the impact energy among the floor panel 10, the rocker beam 20, and the seat cross member 30, effectively reducing the deformation of the floor panel 10, the rocker beam 20, and the seat cross member 30 during the impact, thereby effectively protecting the safety of front-seat passengers in the event of a side-pillar collision. In addition, the expansion beam 40 is used to assemble the battery 200, that is, the expansion beam 40 is used to fix and position the battery 200. The expansion beam 40 provides support for the battery 200 during the installation process of the battery 200, and the expansion beam 40 can withstand the impact energy in the event of a side column collision, reducing the impact energy acting on the battery 200, thereby improving the installation stability and safety of the battery 200.

[0081] According to the third aspect of the present application, an electric vehicle 300 is designed and provided. Specifically, the electric vehicle 300 includes the vehicle body structure as described above. Since the vehicle body structure applies the floor structure 100 provided by the embodiment of the present application, when a side-post collision occurs, the external impact energy first acts on the door sill beam 20 closest to the collision position, and then the impact energy is transferred to the floor 10, the seat cross beam 30 and the expansion beam 40. The expansion beam 40 can withstand a portion of the impact energy when a side-post collision occurs, thereby helping the floor 10, the door sill beam 20 and the seat cross beam 30 to share the impact energy, effectively reducing the deformation of the floor 10, the door sill beam 20 and the seat cross beam 30 in the process of bearing the impact energy, thereby effectively protecting the personal safety of the front passengers when the vehicle body is hit by a side-post collision. In addition, the expansion beam 40 is used to assemble the battery 200, that is, the expansion beam 40 is used to fix and position the battery 200. The expansion beam 40 provides support for the battery 200 during the installation process of the battery 200 and bears the weight of the battery 200. In addition, the expansion beam 40 can withstand the impact energy in the event of a side column collision, reduce the impact energy acting on the battery 200, and thus improve the installation stability and safety of the battery 200.

[0082] like Figure 5 As shown, the electric vehicle 300 also includes a vehicle chassis 310. The vehicle body structure and the vehicle chassis 310 are assembled to form a complete vehicle body. Furthermore, the electric vehicle 300 also includes a battery 200 and a drive motor 320. The expansion beam 40 of the floor structure 100 is used to mount the battery 200, which is also connected to the vehicle chassis 310. The drive motor 320 is mounted on the vehicle chassis 310. When the battery 200 and the drive motor 320 are electrically connected, the battery 200 provides electrical energy to the drive motor 320, enabling the drive motor 320 to operate normally and output mechanical energy, which in turn drives the wheels 330 of the electric vehicle 300 to rotate and move.

[0083] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A floor structure for a vehicle, characterized in that: It includes a base plate, two door sill beams, multiple seat cross beams and at least one expansion beam. The two door sill beams are arranged at intervals on both sides of the base plate, and the multiple seat cross beams are arranged at intervals on the base plate along the extension direction of the door sill beam. The two ends of the seat cross beam are respectively connected to the two door sill beams. The expansion beam is provided on the side of the base plate away from the seat cross beam, and the two ends of the expansion beam are respectively connected to the two door sill beams.

2. The floor structure according to claim 1, characterized in that: The extending direction of the seat cross beam is arranged parallel to the extending direction of the expansion beam.

3. The floor structure according to claim 1 or 2, characterized in that: At least a portion of the expansion beam is located within an area limited by the plurality of seat cross beams.

4. The floor structure according to any one of claims 1 to 3, characterized in that: At least one of the seat cross beams is arranged opposite to one of the expansion beams.

5. The floor structure according to any one of claims 1 to 4, characterized in that: The floor structure includes two seat cross beams and one expansion beam, and the seat cross beam located at the rear in the forward direction of the vehicle is arranged opposite to the expansion beam.

6. The floor structure according to any one of claims 1 to 5, characterized in that: The expansion beam and the base plate are connected by at least one of adhesive connection, welding connection and screw connection.

7. The floor structure according to any one of claims 1 to 6, characterized in that: The two ends of the expansion beam are respectively fixed to the two threshold beams by bolts; Alternatively, both ends of the expansion beam are respectively fixed to the two door sill beams by welding.

8. The floor structure according to any one of claims 1 to 7, characterized in that: At least one of the seat cross beams includes a beam body and a plurality of beam ribs, wherein the plurality of beam ribs are spaced apart from each other on the beam body, an extension direction of each beam rib is consistent with an extension direction of the beam body, and each beam rib is in contact with the bottom plate.

9. The floor structure according to any one of claims 1 to 8, characterized in that: At least one of the seat cross beams includes a beam body, a first beam rib, a second beam rib and a third beam rib. The first beam rib, the second beam rib and the third beam rib are sequentially arranged at intervals on the beam body. The extension directions of the first beam rib, the second beam rib and the third beam rib are all consistent with the extension direction of the beam body. The first beam rib, the second beam rib and the third beam rib are all in contact with the bottom plate.

10. The floor structure according to claim 8 or 9, characterized in that: The beam body and the plurality of beam ribs are integrally formed components.

11. The floor structure according to any one of claims 1 to 10, characterized in that: Both ends of the seat cross beam are connected to the two door sill beams via joint components respectively.

12. The floor structure according to claim 11, characterized in that: The joint component is fixed to the door sill beam by means of bolts; Alternatively, the joint component is fixed to the door sill beam by welding.

13. A vehicle body structure, characterized in that: The invention comprises the floor structure according to any one of claims 1 to 12.

14. An electric vehicle, characterized in that: Comprising the vehicle body structure as claimed in claim 13.

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