Lower vehicle body structure and vehicle

Abstract

The invention provides a lower vehicle body structure and a vehicle. The lower vehicle body structure comprises a lower vehicle body framework, a front auxiliary frame and a battery pack. The battery pack comprises a battery pack frame and a battery pack body arranged in the battery pack frame, and the battery pack frame is provided with side beams arranged on the left side and the right side respectively; the front auxiliary frame is provided with a front auxiliary frame rear cross beam close to the battery pack, the left end and the right end of the front auxiliary frame rear cross beam extend towards the outer side of the vehicle in the left-right direction of the whole vehicle, and the left end and the right end of the front auxiliary frame rear cross beam are connected with the front ends of the side edge beams on the corresponding sides respectively. According to the lower vehicle body structure, the left end and the right end of the rear cross beam of the front auxiliary frame are connected with the front ends of the side edge beams on the corresponding sides, so that the collision force from the front auxiliary frame can be directly transmitted to the side edge beams of the battery pack and the lower vehicle body framework under the working conditions of front collision and small offset collision; therefore, the force transmission path in the front-back direction of the vehicle is more direct and smooth, and the safety of the battery cells in the battery pack and the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an underbody structure. The present invention also relates to a vehicle provided with the underbody structure. Background Art

[0002] With the increasing popularity of electric vehicles, people are paying more and more attention to their safety. In particular, the battery pack is mounted on the vehicle body structure, which places higher demands on the vehicle body structure's load-bearing capacity and ability to absorb collision forces.

[0003] The front subframe and the front portion of the lower body frame are the primary transmission structures for collision forces. The strength of the connection and the effectiveness of the force transmission between them directly impact the safety of the vehicle and battery pack in frontal and small offset collisions. The conventional structure of the front portion of the lower body frame and the front subframe are not arranged properly, resulting in poor transmission of collision forces in the fore-aft direction of the vehicle. This not only compromises the safety of the battery pack but also affects the personal safety of the vehicle's occupants. Therefore, optimizing the force transmission structure at the front of the vehicle to improve its transmission performance is crucial. Summary of the Invention

[0004] In view of this, the present invention aims to provide an underbody structure to improve collision safety.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A lower body structure includes a lower body frame, and a front subframe and a battery pack connected below the lower body frame; the battery pack includes a battery pack frame and a battery pack body arranged in the battery pack frame, and the battery pack frame has side beams arranged on the left and right sides; the front subframe has a front subframe rear cross beam arranged near the battery pack, and the left and right ends of the front subframe rear cross beam extend toward the outside of the vehicle along the left and right direction of the vehicle, and the left and right ends of the front subframe rear cross beam are respectively connected to the front ends of the side beams on the corresponding sides.

[0007] Furthermore, the lower vehicle body frame has rocker beams disposed on the left and right sides; the side beams are disposed below the rocker beams on the corresponding sides and are connected to the rocker beams.

[0008] Furthermore, a notch is provided at the upper portion of the front end of the side beam; the left and right sides of the rear cross beam of the front subframe respectively extend into the notch on the corresponding sides, and the rear cross beam of the front subframe, the side beam and the rocker beam are connected together in the up and down direction of the vehicle.

[0009] Furthermore, the battery pack frame has a front side beam; the front side beam is connected between the front ends of the side beams on both sides, and forms a first annular structure with the side beams on both sides and the rear cross beam of the front subframe.

[0010] Furthermore, oppositely arranged torsion boxes are connected between the front ends of the sill beams on both sides, and a cabin crossbeam is connected between the two torsion boxes; the left and right sides of the rear crossbeam of the front subframe are respectively connected to the torsion boxes on the corresponding sides, and form a second annular structure between the torsion boxes and the cabin crossbeam.

[0011] Furthermore, the torsion box has a clamping portion clamped between the rocker beam and the rear cross beam of the front subframe; the torsion box is connected to the rocker beam, the rear cross beam of the front subframe and the side beam in the vertical direction of the vehicle through the clamping portion.

[0012] Furthermore, the side beams are arranged to protrude forward relative to the front beams; and the front beams are provided with mounting blocks protruding forward, the mounting blocks are located below the cabin cross beams and are connected to the cabin cross beams.

[0013] Furthermore, the side beam extends from the front end of the door sill beam to the rear end of the door sill beam; and / or, the height of the side beam is the same as the height of the battery pack body.

[0014] Furthermore, the lower vehicle body frame includes a floor beam connected between the door sill beams on both sides, and the battery pack body includes a battery pack beam connected between the side beams on both sides; the battery pack beam and the floor beam are arranged correspondingly above and below and connected together.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The lower vehicle body structure described in the present invention is connected to the front end of the side beams on the corresponding sides through the left and right ends of the rear cross beam of the front subframe. Under frontal collision and small offset collision conditions, the collision force from the front subframe can be directly transmitted to the side beams and the lower vehicle body frame, thereby making the force transmission path in the front and rear directions of the vehicle more direct and smooth, and further helping to improve the safety of the battery cells in the battery pack and the vehicle.

[0017] Furthermore, the side rails are connected to the rocker rails on the same side, increasing the width of the battery pack and boosting its capacity while also improving the vehicle's torsional rigidity and handling stability. Notches at the front ends of the side rails facilitate the installation of the two ends of the front subframe's rear crossmember. Connecting the front subframe's rear crossmember, the side rails, and rocker rails allows collision forces from the front subframe to be simultaneously transmitted rearward through the side rails and rocker rails, improving force transmission. The front rails, side rails, and front subframe's rear crossmember form a first ring structure, significantly enhancing the front vehicle's structural rigidity and improving the vehicle's side impact resistance and torsional rigidity. The first ring structure also improves collision force transmission. A second ring structure, connected to the first, is formed between the front subframe's rear crossmember, the torsion box, and the engine compartment crossmember. This further strengthens the front vehicle's structural rigidity, improving the vehicle's side impact resistance and torsional rigidity, while also enhancing collision force transmission.

[0018] Furthermore, the torsion box is connected to the rocker beams, the rear cross member of the front subframe, and the side rails via a clamping section, which not only further enhances the vehicle's rigidity but also facilitates the simultaneous transmission and dispersion of collision forces borne by the torsion box rearward through the rocker beams and side rails, minimizing damage to the vehicle and passengers. The front rails are connected to the cabin cross member via mounting blocks, enhancing the battery pack's mounting strength and dispersing the impact forces transferred to the front rails during a side impact through the cabin cross member, minimizing damage to the battery pack.

[0019] Furthermore, the side rails extend from the front to the rear of the sill beams, and their height is the same as the battery pack itself. This increases the battery pack's dimensions in both the left-right and top-down directions, thereby enhancing its crashworthiness and ensuring greater safety for the battery cells. The battery pack crossbars are aligned and connected to the floor crossbars, enhancing the pack's mounting strength. External forces applied to the battery pack are also transferred to the floor crossbars, dissipating them together and minimizing damage to the battery pack, protecting the cells within.

[0020] In addition, another object of the present invention is to provide a vehicle provided with the above-mentioned lower vehicle body structure.

[0021] The vehicle of the present invention, by providing the lower body structure as described above, can improve the transmission effect of collision force, thereby helping to improve the collision safety of the vehicle and the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the present invention from one viewing angle;

[0024] Figure 2 This is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the present invention from another perspective;

[0025] Figure 3 A schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a battery pack frame according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic structural diagram of a side beam according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the present invention from one viewing angle;

[0029] Figure 7 This is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the present invention from another perspective;

[0030] Figure 8 A schematic diagram of a portion of the structure of the lower vehicle body frame from a first viewing angle according to an embodiment of the present invention;

[0031] Figure 9 A schematic diagram of a portion of the structure of the lower vehicle body frame from a second viewing angle according to an embodiment of the present invention;

[0032] Figure 10 A schematic diagram of a portion of the structure of the lower vehicle body frame from a third viewing angle according to an embodiment of the present invention;

[0033] Figure 11 This is a partial structural diagram of a door sill beam according to an embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram of a portion of the internal structure of a door sill beam according to an embodiment of the present invention;

[0035] Figure 13 This is a schematic structural diagram of a reinforcement member according to an embodiment of the present invention;

[0036] Figure 14 This is a schematic structural diagram of the front portion of the lower vehicle body frame according to an embodiment of the present invention;

[0037] Figure 15 This is a schematic structural diagram of the first ring structure according to an embodiment of the present invention;

[0038] Figure 16 This is a schematic structural diagram of the second ring structure according to an embodiment of the present invention;

[0039] Figure 17 Schematic diagram of the structure of the front lower cross member according to an embodiment of the present invention;

[0040] Figure 18 This is a schematic structural diagram of the front lower cross beam and connecting plate according to an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 100, lower body frame; 200, battery pack; A, first annular structure; B, second annular structure;

[0043] 1. Door sill beam; 2. Battery pack body; 3. Battery pack frame; 4. Front subframe; 5. Front panel; 6. Sealing strip;

[0044] 101, inner plate; 102, outer plate; 103, extension portion; 104, reinforcement; 1041, connecting flange; 1042, reinforcement rib; 106, second bolt; 107, reinforcement plate; 108, first bolt 108;

[0045] 301, side beam; 3011, notch; 3012, partition; 3013, compartment; 302, front side beam; 3021, mounting block; 303, rear side beam; 304, diagonal beam; 305, battery pack cross beam; 306, battery pack rear cross beam; 307, third bolt; 308, fourth bolt;

[0046] 401, rear cross member of front subframe; 402, longitudinal beam of front subframe; 403, middle cross member of front subframe; 4031, extension arm; 404, front cross member of front subframe;

[0047] 501, front floor cross member; 502, rear floor cross member; 503, torque box; 5031, clamping portion; 504, front longitudinal beam; 505, front lower cross member; 5051, rear flange; 5052, protrusion; 5053, support protrusion; 506, rear floor front cross member; 507, connecting plate; 5071, recessed portion; 508, outer connecting plate; 509, cabin cross member

[0048] 601, side portion; 602, front portion; 603, rear portion. DETAILED DESCRIPTION

[0049] 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.

[0050] In describing the present invention, it should be noted that the directional terms used in this embodiment, such as "up, down, left, right, front, and rear," are defined based on the vehicle's up-down, left-right, and front-to-back directions. The up-down direction of the vehicle is also the vehicle's height direction (Z direction), the front-to-back direction of the vehicle is also the vehicle's length direction (X direction), and the left-to-right direction of the vehicle is also the vehicle's width direction (Y direction). Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0053] This embodiment relates to a lower vehicle body structure. In terms of overall structure, the lower vehicle body structure includes a lower vehicle body frame 100, and a front subframe 4 and a battery pack 200 connected below the lower vehicle body frame 100. The battery pack 200 includes a battery pack frame 3 and a battery pack body 2 disposed within the battery pack frame 3. The battery pack frame 3 has side beams 301 disposed on the left and right sides. The front subframe 4 has a front subframe rear crossbeam 401 disposed near the battery pack 2. The left and right ends of the front subframe rear crossbeam 401 extend toward the outside of the vehicle along the left-right direction of the vehicle, and the left and right ends of the front subframe rear crossbeam 401 are respectively connected to the front ends of the corresponding side beams 301.

[0054] The lower body structure of this embodiment is connected to the front end of the side beam 301 on the corresponding side through the left and right ends of the rear cross beam 401 of the front subframe. Under frontal collision and small offset collision conditions, the collision force from the front subframe 4 can be directly transmitted to the side beam 301 of the battery pack 2 and the lower body frame 100, thereby making the force transmission path in the front and rear directions of the vehicle more direct and smooth, which is beneficial to improving collision safety, and further beneficial to improving the safety of the battery cells in the battery pack 200 and the vehicle.

[0055] Based on the above overall introduction, an exemplary structure of the lower vehicle body structure in this embodiment is as follows: Figure 1 and Figure 2As shown in , the lower vehicle body frame 100 in this embodiment includes left and right side sill beams 1. Side rails 301 are located below and connected to the corresponding side sill beams 1. Connecting the sill beams 1 to the corresponding side rails 301 increases the width of the battery pack 200, facilitating a larger volume. This increases the number of battery cells and, consequently, the capacity of the battery pack 200. This also improves the vehicle's torsional rigidity and handling stability.

[0056] As a preferred embodiment, the side beam 301 extends from the front end of the rocker beam 1 to the rear end. This arrangement makes the side beam 301 approximately the same length as the rocker beam 1, facilitating the expansion of the battery pack 200 in the vehicle's fore-aft direction, thereby further increasing the battery pack 200's capacity. It also enhances the strength and reliability of the connection between the side beam 301 and the rocker beam 1, thereby improving the vehicle's torsional rigidity and crashworthiness. In practice, the inner surface of the side beam 301 is flush with the inner surface of the rocker beam 1, which fully increases the internal space of the battery pack 200 and facilitates increasing its capacity.

[0057] Furthermore, the height of the side rails 301 is the same as that of the battery pack body 2, making the height of the sill beam 1 and the battery pack body 2 comparable. This increases the vertical dimension of the battery pack 200, thereby enhancing the crashworthiness of the battery pack 200 and making the battery cells safer. By making the height, width, and length of the side rails 301 comparable to those of the sill beam 1, the longitudinal cross-sectional area of ​​the battery pack 200 is increased, effectively protecting the battery cells within the battery pack 200 in the event of a side impact.

[0058] In this embodiment, the side beam 301 is detachably connected to the sill beam 1 on the same side, facilitating installation and removal of the battery pack 200 from the sill beam 1, thereby facilitating maintenance and replacement of the battery pack 200. Preferably, the side beam 301 and the sill beam 1 on the same side are screwed together, which facilitates installation and removal of the battery pack 200 and provides a good connection. Of course, the side beam 301 and the sill beam 1 can also be connected using other connection structures that meet the requirements.

[0059] In terms of specific structure, Figures 6 to 8 As shown in FIG, multiple first nuts are provided on the side of the bottom wall of each sill beam 1 facing the interior of the beam 1. These first nuts are spaced apart along the vehicle's front-to-rear direction. The sill beam 1 is provided with multiple first through-holes corresponding to the first nuts, and the side beam 301 is provided with multiple first mating holes corresponding to the first through-holes. After passing through the first mating holes and the corresponding first through-holes, the first bolts 108 can be threadedly connected to the corresponding first nuts, thereby establishing a connection between the side beam 301 and the sill beam 1.

[0060] The structure of the front subframe 4 in this embodiment is as follows Figure 7 As shown in FIG, the front subframe 4 further includes left and right front subframe longitudinal beams 402, a front subframe rear crossbeam 401 connected to the rear ends of the two front subframe longitudinal beams 402, and disposed close to the battery pack 200. A front subframe front crossbeam 404 and a front subframe middle crossbeam 403 are connected between the front ends and the middle portions of the two front subframe longitudinal beams 402, respectively.

[0061] The ends of the front subframe front cross member 404 also extend outward from the front subframe longitudinal member 402, and are respectively connected to the bottom of the front end of the front longitudinal member 504. To further enhance the connection strength of the front subframe 4, upwardly extending extension arms 4031 are provided at each end of the front subframe middle cross member 403, with the top ends of the extension arms 4031 connected to the bottom of the rear end of the front longitudinal member 504.

[0062] The arrangement of the front subframe 4 in this embodiment enables the front subframe 4 to participate in the transmission of front-end collision forces. The front subframe 4 has multiple annular force transmission structures arranged front and rear, thereby facilitating improved absorption and dispersion of collision forces, thereby improving collision safety at the front of the vehicle body.

[0063] As a preferred embodiment, Figure 5 、 Figure 9 and Figure 10 As shown in FIG, a notch 3011 is provided at the upper portion of the front end of the side beam 301. The left and right sides of the front subframe rear crossbeam 401 extend into the corresponding notch 3011, and the front subframe rear crossbeam 401, the side beam 301, and the sill beam 1 are connected together in the vertical direction of the vehicle. The notch 3011 provided at the front end of the side beam 301 facilitates the installation of both ends of the front subframe rear crossbeam 401. Furthermore, by connecting the front subframe rear crossbeam 401, the side beam 301, and the sill beam 1 together, the collision force of the front subframe 4 can be transmitted rearward simultaneously through the side beam 301 and the sill beam 1, thereby improving the force transmission effect.

[0064] Due to the provision of the notch 3011, an installation space for the end portion of the front subframe rear cross member 401 to be installed is formed between the front end of the rocker beam 1 and the front end of the side beam 301. The front end and left and right sides of the installation space are open to facilitate the installation of the end portion of the front subframe rear cross member 401, so that the end portion of the front subframe rear cross member 401 is located between the front end of the rocker beam 1 and the front end of the side beam 301.

[0065] To facilitate the connection between the side beam 301, the front subframe rear cross beam 401 and the door sill beam 1, as shown in FIG. Figure 8As shown in FIG, multiple second nuts are provided on the inner side of the bottom wall of the front end of the sill beam 1, also spaced apart along the front-to-back direction of the vehicle. Corresponding to the second nuts, second through-holes are provided at the bottom of the sill beam 1. Connecting posts corresponding to the second through-holes are provided at the end of the front subframe rear cross member 401, each with a second mating hole. Third mating holes corresponding to the second mating holes are provided at the front end of the side beam 301. Second bolts 106 are threadedly connected to the second nuts after passing through the third mating hole, the second mating hole, and the second through-hole, thereby connecting the side beam 301, the rear end of the front subframe 4, and the sill beam 1.

[0066] like Figure 7 and Figure 14 As shown in FIG, a torsion box 503 is connected to the front ends of the two side sill beams 1, and a cabin cross member 509 is connected between the two torsion boxes 503. The torsion box 503 has a clamping portion 5031 that is sandwiched between the sill beam 1 and the front subframe rear cross member 401. The torsion box 503 is connected to the sill beam 1, the front subframe rear cross member 401, and the side member 301 in the vertical direction of the vehicle via the clamping portion 5031.

[0067] In this embodiment, the torsion box 503 is connected to the rocker beam 1, the front subframe rear cross member 401, and the side member 301 via a clamping portion 5031 sandwiched between the rocker beam 1 and the front subframe rear cross member 401. This not only further improves the rigidity of the entire vehicle, but also facilitates the simultaneous transmission and dispersion of the collision force borne by the torsion box 503 rearward through the rocker beam 1 and the side member 301, thereby reducing damage to the vehicle and passengers during a collision.

[0068] Preferably, the width of the torsion box 503 gradually increases from front to rear, and the clamping portion 5031 is formed by extending outward from the rear end of the torsion box 503. The clamping portion 5031 has a simple structure, is easy to process and form, and is conveniently arranged between the rocker beam 1 and the rear cross member 401 of the front subframe.

[0069] The second bolt 106 passes through the clamping portion 5031 and the second through hole and is then threadedly connected to the second nut. As the second bolt 106 and the second nut are tightened, a tight connection between the side member 301, the front subframe rear cross member 401, the torque box 503, and the sill beam 1 can be achieved.

[0070] like Figure 6As shown in Figure 1, a dash lower cross member 505 is positioned between the front ends of the two side sill beams 1. This cross member 505 extends forward from the front end of the battery pack 200 to the bottom of the dash panel 5. This cross member 505, in conjunction with the top surface of the battery pack body 2, forms a floor panel, providing enhanced usability. Torque boxes 503 are fastened to the bottom of the dash lower cross member 505. External connecting plates 508 are located on the outside of each of the torque boxes 503. The torque boxes 503 and external connecting plates 508 on the same side are connected together in the left-right direction of the vehicle and are connected to the bottom of the dash lower cross member 505.

[0071] In addition, in the connected state, the front ends of the torsion box 503 and the outer connecting plate 508 are connected to the rear end of the same-side front longitudinal beam 504. When the collision force passes through the torsion box 503 and the outer connecting plate 508, it can be absorbed and continued to be transmitted backward, thereby improving the dispersion and transmission effect of the collision force.

[0072] As a preferred embodiment, Figure 3 and Figure 15 As shown in , the battery pack frame 3 has a front side member 302, which is connected between the front ends of the side members 301 on both sides. The front side member 302, together with the side members 301 on both sides and the rear cross member 401 of the front subframe, forms a first annular structure A. Here, the first annular structure A is located at the front end of the battery pack 200, which can significantly enhance the structural rigidity of the front part of the vehicle body and improve the side impact resistance and torsional rigidity of the vehicle. At the same time, the first annular structure A also helps to improve the force transmission effect of the front part of the vehicle body to the collision force, thereby reducing the damage caused by the collision force to the battery pack 200 and the occupants of the vehicle.

[0073] In addition, if Figure 3 As shown in , the battery pack frame 3 also includes a rear side beam 303 arranged at the other end of the battery pack 200 relative to the front side beam 302, and the length of the rear side beam 303 is smaller than the length of the front side beam 302, and an oblique beam 304 is connected between the rear end of each side beam 301 and the rear side beam 303 at the same end.

[0074] In this embodiment, the side beams are connected to form a closed-loop frame structure, which serves as a carrier for mounting the battery pack 200. This makes the battery pack frame 3 not only simple in structure and easy to arrange and implement, but also has high structural strength. Of course, in specific implementations, the structure of the battery pack frame 3 can still be adjusted according to actual needs. For example, the rear side beams 303 and front side beams 302 can be made the same length, in which case the diagonal beams 304 are unnecessary.

[0075] Further, such as Figure 16As shown in , the left and right sides of the front subframe rear crossbeam 401 are respectively connected to the torsion box 503 on the corresponding side, and a second annular structure B is formed between the torsion box 503 and the cabin crossbeam 509. Here, the second annular structure B connected to the first annular structure A is formed between the front subframe rear crossbeam 401, the torsion box 503, and the cabin crossbeam 509. The second annular structure B is also located in front of the battery pack 200. The cooperation between the first annular structure A and the second annular structure B can further enhance the structural rigidity of the cabin, improve the vehicle's side crashworthiness and torsional rigidity, and further improve the transmission of collision forces, thereby reducing the collision forces transmitted to the battery pack 200 and improving the safety of the battery pack 200.

[0076] Specifically, the end of the front subframe rear cross member 401 is connected to the middle portion of the corresponding torque box 503 via a fifth bolt. This arrangement improves the connection strength between the torque box 503 and the front subframe rear cross member 401, allowing the collision force on the front subframe 4 to be transmitted to the torque box 503, the rocker beam 1, and the side beam 301. This helps enrich the force transmission path at the front of the vehicle body and improves the transmission and dispersion of the collision force.

[0077] In this embodiment, collision forces transmitted to the front subframe rear crossbeam 401 are absorbed by the first annular structure A and then transferred to the side rails 301 and the rocker beam 1 on the same side, transmitting them rearward through both. Simultaneously, collision forces transmitted to the front subframe rear crossbeam 401 are also absorbed by the second annular structure B and transferred through the torsion box 503 to the side rails 301 and the rocker beam 1 on the same side, transmitting them rearward through both. This helps improve the consistency of force transmission between the front subframe 4, the rocker beam 1, and the battery pack frame 3 in the vehicle's fore-aft direction.

[0078] In order to facilitate the formation of the first ring structure A, as Figure 3 As shown in , the side beam 301 is arranged to protrude forward relative to the front beam 302, and the notch 3011 is specifically located at the protruding position, thereby facilitating the connection between the end of the front subframe rear crossbeam 401 and the side beam 301 at the same end, thereby facilitating the formation of the first annular structure A. In addition, a forward-protruding mounting block 3021 is provided on the front beam 302. The mounting block 3021 is located below the cabin crossbeam 509 and is connected to the cabin crossbeam 509. The front beam 302 is connected to the cabin crossbeam 509 via the mounting block 3021, which helps to improve the installation strength of the battery pack 200. At the same time, it allows the collision force transmitted to the front beam 302 during a side collision to be transmitted and dispersed through the cabin crossbeam 509, thereby reducing damage to the battery pack 200.

[0079] To facilitate the formation of the aforementioned second annular structure B, two mounting blocks 3021 are spaced apart along the left-right direction of the vehicle in this embodiment, one corresponding to each end of the cabin cross beam 509. As a preferred connection example, the mounting blocks 3021 are connected to the cabin cross beam 509 via a fifth bolt threaded through the mounting blocks 3021, which is then threaded onto a fifth nut on the cabin cross beam 509. The two mounting blocks 3021, in combination, provide effective support for the cabin cross beam 509. It is understood that the number and location of the mounting blocks 3021 can be adjusted based on usage requirements.

[0080] Furthermore, each mounting block 3021 is welded to the front side of the front side beam 302, and each mounting block 3021 is provided with a plurality of separate weight-reducing cavities. The provision of the weight-reducing cavities helps reduce the weight of the mounting block 3021, thereby contributing to the lightweighting of the lower vehicle body structure.

[0081] In order to further improve the structural strength of the front subframe rear cross member 401, Figure 15 As shown in the figure, the middle portion of the front subframe rear crossbeam 401 is arched forward. The high strength of the arched structure is utilized to improve the structural strength and load-bearing effect of the front subframe rear crossbeam 401, and to guide the external force on it to the left and right ends, thereby improving the dispersion of collision force. In order to enhance the guidance effect of the front subframe rear crossbeam 401 on the transmission of collision force backward, the spacing between the connecting parts on the left and right sides of the arch on the front subframe rear crossbeam 401 is set to gradually increase from the front to the rear.

[0082] As a preferred embodiment, Figure 4 and Figure 6 As shown in the figure, the lower body frame 100 includes a floor beam connected between the two side sill beams 1, and the battery pack body 200 includes a battery pack beam 305 connected between the two side rails 301. The battery pack beam 305 is arranged above and below the floor beams and connected together. Here, the battery pack beam 305 is arranged above and below the floor beams and connected together, which can improve the installation strength of the battery pack 200. At the same time, the external forces applied to the battery pack 200 can be transmitted to the floor beams, where they are jointly dissipated, reducing damage to the battery pack 200 and protecting the internal cells.

[0083] In terms of detailed structure, Figure 6 and Figure 7As shown in , the floor crossbeams in this embodiment are two spaced apart and connected in the middle between the side door sill beams 1 along the front-to-back direction of the vehicle. The battery pack crossbeam 305 is provided in a one-to-one correspondence with each floor crossbeam. For the convenience of distinguishing descriptions, the floor crossbeam arranged in the front is referred to as the front floor crossbeam 501, and the floor crossbeam arranged in the rear is referred to as the rear floor crossbeam 502. The front floor crossbeam 501 is provided with a mounting structure for installing the front seats, and the rear floor crossbeam 502 is provided with a mounting structure for installing the rear seats. The floor crossbeams in this embodiment are preferably formed by rolling, which helps to improve the structural strength and force transmission effect of the rear floor crossbeam.

[0084] Preferably, the battery pack crossbeam 305 is detachably connected to the floor crossbeam to facilitate loading and unloading of the battery pack 200. For example, the battery pack crossbeam 305 is bolted to the floor crossbeam. A plurality of third bolts 307 are threaded through the battery pack crossbeam 305 and the corresponding floor crossbeam before being screwed to the sixth nut. Of course, the number of third bolts 307 can be adjusted according to usage requirements.

[0085] like Figure 11 As shown in FIG, an extension portion 103 is provided on the side of the sill beam 1 that faces the vehicle exterior. Extension portion 103 extends downward and is located on the side of the side rail 301 that faces the vehicle exterior. In this embodiment, the extension portion 103 on the sill beam 1 can conceal the gap between the sill beam 1 and the side rail 301, which not only improves the sealing effect but also enhances the aesthetics.

[0086] In terms of specific structure, Figure 11 As shown in the figure, the sill beam 1 comprises an inner panel 101 and an outer panel 102, which are interlocked and connected on both sides. A reinforcement plate 107 is located at the inner front end of the outer panel 102, corresponding to the A-pillar. The outer side of the bottom of the inner panel 101 is folded downward to form a lower flange. The bottom of the reinforcement plate 107 extends downward to the outer side of the lower flange and is welded to the lower flange. The extension portion 103 specifically comprises the lower flange and the reinforcement plate 107 located outside the lower flange. The extension portion 103 has a simple structure and is easy to form on the sill beam 1.

[0087] To enhance the performance of the sill beam 1, in this embodiment, a reinforcement member 104 is provided within the sill beam 1. The reinforcement member 104 connects between the left and right sidewalls of the sill beam 1. Preferably, the reinforcement member 104 is box-shaped and forms a cavity with the sill beam 1. The box-shaped reinforcement member 104 within the sill beam 1 leverages the high strength of the box-shaped structure to enhance the structural strength of the sill beam 1, thereby improving the rigidity and crashworthiness of the entire vehicle.

[0088] In terms of specific structure, Figure 12As shown in the figure, three reinforcement members 104 are spaced apart at the rear of the sill beam 1. These three reinforcement members 104 correspond to the sill beam 1 between the front and rear door openings and are spaced apart within the sill beam 1 along the vehicle's front-to-back direction. Each reinforcement member 104 has a top wall and peripheral walls connected to the front, rear, and outer sides of the top wall. The bottom and the side facing the interior of the reinforcement member 104 are open. Of course, the number and location of the reinforcement members 104 can be adjusted based on usage requirements.

[0089] To facilitate the installation of the reinforcement 104, as Figure 13 As shown, the front and thick walls of the reinforcement 104 are provided with outward-turned connecting flanges 1041. These flanges overlap and are welded to the sill beam 1. As the reinforcement 104 is attached to the sill beam 1, all openings on the reinforcement 104 are blocked by the sill beam 1, creating a cavity between each reinforcement 104 and the sill beam 1. This cavity enhances structural strength, improving the structural strength of the sill beam 1 between the front and rear door openings and enhancing the sill beam's ability to disperse collision forces.

[0090] In addition, in order to further improve the structural strength of the reinforcement 104, a plurality of reinforcement ribs 1042 may be provided on the reinforcement 104. Figure 13 As shown in FIG, reinforcing ribs 1042 are provided on the front and rear walls of the reinforcement member 104. The ribs 1042 extend in the left-right direction of the vehicle, facilitating processing and forming while also providing improved performance. Of course, in practice, the shape, number, and location of the reinforcement member 104 and its ribs 1042 can be adjusted to meet specific needs.

[0091] As a preferred embodiment, each beam of the battery pack frame 3 in this embodiment has multiple cavities extending along its length. Furthermore, at least one of the cavities is provided with a partition 3012, which divides the cavity into multiple sub-cavities 3013 arranged in a stacked manner. By providing multiple cavities and dividing the cavity into multiple sub-cavities 3013 stacked in an upper and lower manner by the partition 3012, the side beams 301, front beams 302, and battery pack cross beams 305 can have better structural strength and force transmission performance, thereby improving their respective crashworthiness. At the same time, the provision of the sub-cavities 3013 also helps reduce the weight of the battery pack 200, thereby facilitating the lightweight design of the lower body structure.

[0092] Taking the side beam 301 as an example, the side beam 301 has two cavities arranged sequentially on the upper side, and each cavity is provided with multiple partitions 3012 connected horizontally and vertically, so that each cavity has multiple sub-cavities 3013. It is understood that the number and arrangement of the cavities and partitions 3012 in each beam can be adaptively adjusted according to usage requirements.

[0093] As a preferred embodiment, Figure 7 and Figure 8 As shown in the figure, the lower body frame 100 also includes a rear floor front cross member 506 disposed between the side sill beams 1. A sealing strip 6 is provided between the lower body frame 100 and the battery pack frame 3. The provision of the sealing strip 6 helps ensure a good seal between the top surface of the battery pack 200 and the lower body frame 100, thereby making the top surface of the battery pack body 200 form the floor panel. Compared to conventional CTB structures, the front floor panel is completely eliminated, reducing weight and cost.

[0094] The sealing strip 6 includes two annular side portions 601, and a front portion 602 and a rear portion 603 disposed between the side portions 601. The side portion 601 is disposed below the rocker beam 1, the front portion 602 is disposed below the front dash lower cross member 505, and the rear portion 603 is disposed below the rear floor front cross member 506. Locating each portion of the sealing strip 6 below the rocker beam 505, the rear floor front cross member 506, or the rocker beam 1, where they have relatively high rigidity, increases the rigidity of the sealing area, prevents deformation of the sealing strip 6, and improves the sealing effect, thereby ensuring a good seal when the upper surface of the battery pack 200 serves as the floor panel.

[0095] like Figures 14 to 16 As shown in FIG, the rear portion of the dash lower cross member 505 is provided with a rearwardly folded rear flange 5051, and the front portion 602 is located below the rear flange 5051 and between the battery pack body 2. The provision of the rear flange 5051 not only improves the structural strength of the dash lower cross member 505 but also enhances the compression effect on the sealing strip 6, thereby preventing deformation of the sealing strip 6 and ensuring the sealing performance of the sealing strip 6.

[0096] Further, such as Figure 14 and Figure 15 As shown in FIG, the rear ends of the two torsion boxes 503 on the left and right sides overlap the bottom surface of the rear flange 5051 and are welded to the rear flange 5051. The front portion 602 of the sealing strip 6 is specifically located between the torsion box 503 and the battery pack body 2. This helps to improve the connection strength between the front lower cross member 505 and the torsion box 503, thereby improving the transmission and dispersion of collision force.

[0097] In order to ensure the compression effect of the rear flange 5051 on the sealing strip 6, a protruding portion 5052 is provided on the rear flange 5051 between the rear ends of the two torsion boxes 503, and the bottom surface of the protruding portion 5052 and the bottom surface of the torsion box 503 cooperate with each other to compress the sealing strip 6 of the front part 602, which is beneficial to ensure the sealing performance of the sealing strip 6, thereby ensuring the effect of using the top surface of the battery pack body 2 as a floor.

[0098] In this embodiment, a battery pack rear cross member 306 is disposed between the side beams 301, corresponding to the rear floor front cross member 506, and is detachably connected to the rear floor front cross member 506. The rear portion 603 is located in front of the battery pack rear cross member 306. The connection between the battery pack rear cross member 306 and the rear floor front cross member 506 further enhances the compression of the rear floor front cross member 506 against the rear portion 603. The battery pack rear cross member 306 and the rear floor front cross member 506 are detachably connected via a plurality of fourth bolts 308.

[0099] like Figure 7 、 Figure 17 and Figure 18 As shown in the figure, a connecting plate 507 is provided at the front end of the middle portion of the front floor beam 501. This connecting plate 507 extends forward along the vehicle's front-to-back direction to the bottom of the dash panel 5 and is connected to both the dash lower beam 505 and the battery pack body 2. The cross-section of connecting plate 507 forms a "J" shape, two connected "J" shapes. A cavity, separated by left and right, is formed between connecting plate 507, the battery pack body 2, the front floor beam 501, the dash panel 5, and the dash lower beam 505.

[0100] In this embodiment, the connection plate 507 is provided to facilitate the formation of a force transmission path between the bottom of the front panel 5 and the middle of the front floor beam 501. The connection plate 507 has a high structural strength, which facilitates the collision force transmitted to the front panel to be transmitted rearward simultaneously through the connection plate 507, the rocker beam 1 and the side beam 301, thereby improving the force transmission performance of the lower vehicle body structure to the collision force, thereby further improving the collision safety of the vehicle.

[0101] Further, such as Figure 17 As shown in FIG, a support protrusion 5053 is provided on the dash lower cross member 505, corresponding to the recessed portion 5071 in the middle of the connecting plate 507. The recessed portion 5071 in the middle of the connecting plate 507 abuts against the support protrusion 5053. The cooperation between the support protrusion 5053 and the recessed portion 5071 helps to improve the structural strength of the dash lower cross member 505 and the connection effect between the dash lower cross member 505 and the connecting plate 507.

[0102] The lower vehicle body structure in this embodiment can make the force transmission of the front part of the vehicle body in the length direction of the entire vehicle more consistent by optimizing the connection relationship between the front subframe 4 and the rocker beam 1, the battery pack frame 3, the torsion box 503 and the cabin cross beam 509, and the cooperation of the first annular structure A and the second annular structure B helps to enrich the force transmission path of the front part of the lower vehicle body structure, thereby reducing the collision force transmitted to the battery pack 200, and further helping to improve the safety of the battery pack 200.

[0103] In addition, this embodiment also relates to a vehicle, which is provided with the above-mentioned lower body structure. The vehicle in this embodiment, by providing the above-mentioned lower body structure, is conducive to improving the safety of the battery pack and the vehicle.

[0104] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lower vehicle body structure, characterized in that: It comprises a lower vehicle body frame (100), and a front sub-frame (4) and a battery pack (200) connected below the lower vehicle body frame (100); The battery pack (200) comprises a battery pack frame (3) and a battery pack body (2) arranged in the battery pack frame (3); the battery pack frame (3) has side beams (301) arranged on the left and right sides; The front subframe (4) has a front subframe rear crossbeam (401) arranged near the battery pack (200), the left and right ends of the front subframe rear crossbeam (401) both extending toward the outside of the vehicle along the left and right directions of the vehicle, and the left and right ends of the front subframe rear crossbeam (401) are respectively connected to the front ends of the side beams (301) on the corresponding sides.

2. The lower vehicle body structure according to claim 1, characterized in that: The lower vehicle body frame (100) has door sill beams (1) arranged on the left and right sides; The side beam (301) is arranged below the threshold beam (1) on the corresponding side and is connected to the threshold beam (1).

3. The lower vehicle body structure according to claim 2, wherein: The upper portion of the front end of the side beam (301) is provided with a notch (3011); The left and right sides of the front subframe rear cross beam (401) respectively extend into the recesses (3011) on the corresponding sides, and the front subframe rear cross beam (401), the side beams (301) and the door sill beam (1) are connected together in the vertical direction of the entire vehicle.

4. The lower vehicle body structure according to claim 2, wherein: The battery pack frame (3) has a front side beam (302); The front side beam (302) is connected between the front ends of the side beams (301) on both sides, and is surrounded by the side beams (301) on both sides and the rear cross beam (401) of the front subframe to form a first annular structure (A).

5. The lower vehicle body structure according to claim 4, characterized in that: The front ends of the sill beams (1) on both sides are connected to oppositely arranged torsion boxes (503), and a cabin crossbeam (509) is connected between the two torsion boxes (503); The left and right sides of the front subframe rear cross beam (401) are respectively connected to the torsion box (503) on the corresponding side, and a second annular structure (B) is formed between the torsion box (503) and the cabin cross beam (509).

6. The lower vehicle body structure according to claim 5, characterized in that: The torsion box (503) has a clamping portion (5031) clamped between the door sill beam (1) and the rear cross beam (401) of the front subframe; The torsion box (503) is connected to the door sill beam (1), the front subframe rear cross beam (401) and the side beam (301) in the vertical direction of the entire vehicle through the clamping portion (5031).

7. The lower vehicle body structure according to claim 5, characterized in that: The side beam (301) is arranged to protrude forward relative to the front beam (302); The front side beam (302) is provided with a mounting block (3021) protruding forward, and the mounting block (3021) is located below the cabin cross beam (509) and is connected to the cabin cross beam (509).

8. The lower vehicle body structure according to claim 3, characterized in that: The side beam (301) extends from the front end of the door sill beam (1) to the rear end of the door sill beam (1); and / or, The height of the side beam (301) is the same as the height of the battery pack body (2).

9. The lower vehicle body structure according to any one of claims 3 to 8, characterized in that: The lower vehicle body frame (100) includes a floor crossbeam connected between the door sill beams (1) on both sides, and the battery pack body (2) includes a battery pack crossbeam (305) connected between the side beams (301) on both sides; The battery pack crossbeam (305) and the floor crossbeam are arranged correspondingly up and down and connected together.

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

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