Lower vehicle body structure and vehicle

Abstract

The utility model provides a lower vehicle body structure and a vehicle. The lower vehicle body structure comprises a lower vehicle body framework and a battery pack arranged at the bottom of the lower vehicle body framework. The lower vehicle body framework comprises threshold beams arranged on the left side and the right side respectively, and the battery pack comprises a battery pack frame and a battery pack body arranged in the battery pack frame. The battery pack frame is provided with side edge beams arranged on the left side and the right side respectively, the side edge beams on the sides are located below the threshold beams on the corresponding sides and connected with the threshold beams on the corresponding sides, and the side edge beams and the battery pack body are the same in height in the vertical direction of the whole vehicle. According to the lower vehicle body structure, the size of the whole battery pack in the left-right direction and the up-down direction of the whole vehicle is increased, the battery capacity and the crashworthiness of the battery pack can be improved, the safety of the battery pack can be effectively protected when the vehicle is subjected to side collision, meanwhile, the threshold beams and the side edge beams are connected together, and the safety of the battery pack is improved. And the torsional rigidity of the vehicle is improved, so that the control stability of the vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a lower vehicle body structure. The utility model also relates to a vehicle provided with the lower vehicle body structure. Background Art

[0002] With the popularity of electric vehicles, people pay more and more attention to the safety of electric vehicles. In particular, the battery pack is mounted on the body structure, which puts higher requirements on the load-bearing capacity of the body structure and the ability to absorb collision force.

[0003] In the prior art, due to the unreasonable design of the vehicle body structure equipped with the battery pack, the torsional rigidity of the vehicle body structure is low, and the force transmission effect of the collision force is poor, which in turn affects the safety and handling stability of the vehicle. In addition, the battery pack is small in size, so that the battery pack cannot participate well in the transmission of the collision force, and the battery pack is also easily damaged by the collision, which is not conducive to the safety of the battery pack and the vehicle. Utility Model Content

[0004] In view of this, the present invention aims to propose an underbody structure to improve the crash resistance and the safety of the battery pack and the vehicle.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A lower vehicle body structure includes a lower vehicle body frame and a battery pack disposed at the bottom of the lower vehicle body frame; the lower vehicle body frame includes door sill beams disposed on left and right sides, and the battery pack includes a battery pack frame and a battery pack body disposed in the battery pack frame; the battery pack frame has side beams disposed on left and right sides, the side beams on each side are located below the door sill beam on the corresponding side and are connected to the door sill beam on the corresponding side, and the side beams and the battery pack body have the same height in the up and down direction of the entire vehicle.

[0007] Furthermore, the side beam extends from the front end of the door sill beam to the rear end of the door sill beam.

[0008] Furthermore, a notch is provided at the upper portion of the front end of the side beam; the rear end of the front subframe is inserted into the notch and connected with the side beam and the door sill beam.

[0009] Furthermore, the inner side surface of the side beam is flush with the inner side surface of the door sill beam.

[0010] Furthermore, the side beam has a plurality of cavities arranged in sequence along the left-right direction of the vehicle, and each of the cavities extends along the length direction of the side beam; at least one of the cavities is provided with a partition, and the partition divides the cavity into a plurality of sub-cavities stacked up and down.

[0011] Furthermore, an extension portion is provided on a side of the door sill beam close to the outside of the vehicle; the extension portion extends downward and is located on a side of the side beam close to the outside of the vehicle.

[0012] Furthermore, a reinforcement is provided in the threshold beam, and the reinforcement is connected between the side walls on the left and right sides of the threshold beam; the reinforcement is box-shaped and forms a cavity with the threshold beam.

[0013] Furthermore, the lower vehicle body frame includes a floor beam connected between the door sill beams on both sides, and the battery pack has a battery pack beam connected between the side beams on both sides; the battery pack beam and the floor beam are arranged correspondingly up and down and connected together.

[0014] Furthermore, the lower vehicle body frame also includes a front lower cross beam and a rear floor front cross beam arranged between the door sill beams on both sides, and a sealing strip is provided between the lower vehicle body frame and the battery pack frame; the sealing strip includes two side portions forming a ring, and a front portion and a rear portion arranged between the side portions on both sides, and the side portion is arranged below the door sill beam, the front portion is arranged below the front lower cross beam, and the rear portion is arranged below the rear floor front cross beam.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The lower vehicle body structure described in the utility model is located below the corresponding side sill beam through the side beams on each side and is connected to the sill beam on the corresponding side, and the side beams and the battery pack body have the same height in the up and down direction of the whole vehicle, so that the overall size of the battery pack in the left and right direction and the up and down direction of the whole vehicle is increased, which is beneficial to increase the number of battery cells in the battery pack, thereby improving the battery capacity and collision resistance, and can effectively protect the safety of the battery pack when the vehicle is hit from the side. At the same time, it is connected together through the sill beam and the side beam, which is beneficial to improve the torsional stiffness of the vehicle, thereby improving the handling stability of the vehicle.

[0017] In addition, the side beam extends from the front end of the sill beam to the rear end of the sill beam, so that the length of the side beam is equivalent to the sill beam, which is conducive to increasing the size of the battery pack in the front and rear directions of the vehicle, not only to further increase the capacity of the battery pack, but also to improve the rigidity and crash resistance of the lower body structure. The setting of the notch at the front end of the side beam is conducive to the connection between the rear end of the front subframe and the side beam and the sill beam, so that the collision force of the front subframe can be transmitted backward through the side beam and the sill beam at the same time, which is conducive to improving the force transmission effect. The inner side of the side beam is set flush with the inner side of the sill beam, which can fully increase the internal space of the battery pack and help increase the capacity of the battery pack. The multiple cavities in the side beam and the partition that divides the cavity into multiple sub-cavities stacked up and down can make the side beam have better structural strength and force transmission performance, which can improve the crash resistance of the lower body structure.

[0018] In addition, the setting of the extension part on the threshold beam can cover the gap between the threshold beam and the battery pack, which is not only conducive to improving the sealing effect, but also improves the aesthetics of the threshold beam. A box-shaped reinforcement is set in the threshold beam, and the high strength of the box-shaped structure can be used to improve the structural strength of the threshold beam, which is conducive to improving the rigidity and crash resistance of the whole vehicle. The battery pack crossbeam and the floor crossbeam are arranged in correspondence up and down and connected together, which can improve the installation strength of the battery pack. At the same time, the external force borne by the battery pack can also be transmitted to the floor crossbeam, and the force transmission can be jointly dispersed, which can reduce damage to the battery pack and protect the battery cells inside the battery pack. All parts of the sealing strip are arranged under the crossbeam or threshold beam with better rigidity, which can improve the rigidity of the sealing position, prevent the deformation of the sealing strip, and improve the sealing effect.

[0019] In addition, another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the above-mentioned lower vehicle body structure.

[0020] The vehicle described in the utility model is beneficial to improving the safety of the battery pack and the vehicle by providing the lower body structure as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the utility model at one viewing angle;

[0023] Figure 2 It is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the utility model from another perspective;

[0024] Figure 3This is a schematic diagram of the structure of the battery pack according to an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the battery pack frame according to an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the side beam according to an embodiment of the utility model;

[0027] Figure 6 It is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the utility model at one viewing angle;

[0028] Figure 7 It is a schematic structural diagram of the lower vehicle body frame according to an embodiment of the utility model from another perspective;

[0029] Figure 8 It is a schematic diagram of a part of the structure of the lower vehicle body frame from a first viewing angle according to an embodiment of the utility model;

[0030] Fig. 9 It is a schematic diagram of a part of the structure of the lower vehicle body frame at a second viewing angle according to an embodiment of the utility model;

[0031] Fig.10 It is a partial structural schematic diagram of the lower vehicle body frame from a third viewing angle according to an embodiment of the utility model;

[0032] Fig.11 It is a partial structural schematic diagram of the threshold beam according to an embodiment of the utility model;

[0033] Fig.12 This is a schematic diagram of a portion of the internal structure of the threshold beam according to an embodiment of the utility model;

[0034] Fig.13 This is a schematic diagram of the structure of the reinforcement member according to an embodiment of the utility model;

[0035] Fig.14 It is a structural schematic diagram of the front part of the lower vehicle body frame according to an embodiment of the utility model;

[0036] Fig.15 This is a schematic structural diagram of the front wall lower cross beam according to an embodiment of the utility model;

[0037] Fig.16 It is a schematic structural diagram of the front enclosure lower cross beam and the connecting plate according to an embodiment of the utility model.

[0038] Description of reference numerals:

[0039] 100. Lower body frame; 200. Battery pack;

[0040] 1. Door sill beam; 2. Battery pack body; 3. Battery pack frame; 4. Front subframe; 5. Front panel; 6. Sealing strip;

[0041] 101, inner plate; 102, outer plate; 103, extension portion; 104, reinforcement member; 1041, connecting flange; 1042, reinforcement rib; 106, second bolt; 107, reinforcement plate; 108, first bolt;

[0042] 301, side beam; 3011, notch; 3012, partition; 3013, compartment; 302, front beam; 303, rear beam; 304, oblique beam; 305, battery pack cross beam; 306, battery pack rear cross beam; 307, third bolt; 308, fourth bolt;

[0043] 401, rear cross beam of subframe; 402, longitudinal beam of front subframe; 403, middle cross beam of front subframe; 4031, extension arm; 404, front cross beam of front subframe;

[0044] 501, front crossbeam of floor; 502, rear crossbeam of floor; 503, torque box; 5031, clamping part; 504, front longitudinal beam; 505, lower crossbeam of front enclosure; 5051, rear flange; 5052, protruding part; 5053, supporting protrusion; 506, front crossbeam of rear floor; 507, connecting plate; 5071, recessed part; 508, outer connecting plate;

[0045] 601, side portion; 602, front portion; 603, rear portion. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0047] In the description of the present utility model, it should be noted that the directional words such as "up, down, left, right, front, and back" used in the present embodiment are defined based on the up-down direction, left-right direction, and front-back direction of the vehicle. Among them, the up-down direction of the vehicle is also the height direction of the vehicle (Z direction), the front-back direction of the vehicle is also the length direction of the vehicle (X direction), and the left-right direction of the vehicle is also the width direction of the vehicle (Y direction). In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] The present embodiment relates to an underbody structure, which aims to optimize its own structure and improve the crash resistance as well as the safety of the battery pack 200 and the vehicle.

[0051] In terms of overall structure, the lower body structure includes a lower body frame 100 and a battery pack 200 disposed at the bottom of the lower body frame 100. The lower body frame 100 includes a sill beam 1 disposed on the left and right sides, and the battery pack 200 includes a battery pack frame 3 and a battery pack body 2 disposed in the battery pack frame 3. The battery pack frame 3 has side beams 301 disposed on the left and right sides, each side beam 301 is located below the corresponding side sill beam 1 and is connected to the corresponding side sill beam 1, and the side beam 301 and the battery pack body 2 have the same height along the vertical direction of the vehicle.

[0052] The lower body structure of this embodiment is located below the corresponding side sill beam 1 through the side side beams 301 on each side and connected to the corresponding side sill beam 1, and the side beams 301 and the battery pack body 2 have the same height in the vertical direction of the vehicle, so that the overall size of the battery pack 200 in the left-right direction and the vertical direction of the vehicle is increased, which is conducive to increasing the number of cells in the battery pack 200, thereby improving the battery capacity and crash resistance. When the vehicle is hit from the side, the safety of the battery pack 200 can be effectively protected. At the same time, the sill beam 1 and the side beams 301 are connected together, which is conducive to improving the torsional stiffness of the vehicle, thereby improving the handling stability of the vehicle.

[0053] Based on the above overall introduction, an exemplary structure of the lower vehicle body structure of this embodiment is as follows: Figure 1 and Figure 2 As shown in FIG. , the structure of the battery pack 200 is as follows Figure 3 and Figure 4 As shown in FIG. 1 , the structure of the lower vehicle body frame 100 is as follows: Figures 5 to 8 As shown in , the structure of the battery pack 200 is first described below.

[0054] The battery pack frame 3 in this embodiment also includes a front side beam 302 connected between the front ends of the side beams 301 on both sides, a rear side beam 303 provided 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 less 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. The side beams are connected to form a closed-loop frame structure, which serves as a carrier for installing the battery pack 200. It is not only simple in structure and easy to arrange and implement, but also has a high structural strength. Of course, during the specific implementation, the structure of the battery pack frame 3 can still be adjusted according to the use requirements. For example, the length of the rear side beam 303 can be the same as that of the front side beam 302, and then there is no need to set the oblique beam 304.

[0055] As a preferred embodiment, Figure 1 and Figure 2 As shown in , the side beam 301 extends from the front end of the sill beam 1 to the rear end of the sill beam 1. Such a configuration makes the length of the side beam 301 equal to that of the sill beam 1, which is conducive to increasing the size of the battery pack 200 in the front-rear direction of the vehicle, and can further increase the number of cells in the battery pack 200, thereby increasing the capacity of the battery pack 200, and also helps to improve the connection strength and reliability between the side beam 301 and the sill beam 1, thereby improving the torsional rigidity and crash resistance of the vehicle.

[0056] In addition, the inner side surface of the side beam 301 is flush with the inner side surface of the door sill beam 1. Here, the inner side surface of the side beam 301 is flush with the inner side surface of the door sill beam 1, which can fully increase the internal space of the battery pack 200 and help increase the capacity of the battery pack 200.

[0057] As a preferred embodiment, the side beam 301 has a plurality of cavities arranged in sequence along the left-right direction of the vehicle, and each cavity extends along the length direction of the side beam 301. Further, at least one of the cavities is provided with a partition 3012, and the partition 3012 divides the cavity into a plurality of sub-cavities 3013 stacked up and down. Here, the plurality of cavities in the side beam 301 and the partition 3012 divide the cavity into a plurality of sub-cavities 3013 stacked up and down can make the side beam 301 have better structural strength and force transmission performance, and can improve its crashworthiness.

[0058] Specifically, if Figure 5As shown in , two cavities are arranged in sequence on the upper and lower sides in the side beam 301, and multiple partitions 3012 connected horizontally and vertically are arranged in each cavity, so that each cavity has multiple sub-cavities 3013. The cavity structure has the characteristics of high structural strength, and the sub-cavities 3013 stacked up and down and left and right have the characteristics of good force transmission effect, which is conducive to further improving the structural strength and force transmission performance of the side beam 301, thereby improving the safety of the lower body structure. It is understandable that the number and arrangement of the cavities and partitions 3012 in the side beam 301 can be adaptively adjusted according to the use requirements.

[0059] The side beam 301 in this embodiment is detachably connected to the threshold beam 1 on the same side, so as to facilitate the installation and removal of the battery pack 200 on the threshold beam 1, thereby facilitating the maintenance and replacement of the battery pack 200. Preferably, the side beam 301 is screwed to the threshold beam 1 on the same side, which is convenient for the installation and removal of the battery pack 200 and has a good connection effect. Of course, the side beam 301 and the threshold beam 1 can also be connected by other connection structures as long as they can meet the use requirements.

[0060] In terms of specific structure, Figures 6 to 8 As shown in , a plurality of first nuts are provided on one side of the bottom wall of each sill beam 1 facing the interior of the sill beam 1, and the plurality of first nuts are arranged at intervals along the front-rear direction of the vehicle. The sill beam 1 is provided with a plurality of first through holes corresponding to the first nuts, and the side beam 301 is provided with a plurality of first matching holes arranged one-to-one corresponding to the first through holes. After the first bolt 108 passes through the first matching hole and the corresponding first through hole, it can be screwed and connected with the corresponding first nut, thereby realizing the connection between the side beam 301 and the sill beam 1.

[0061] As a preferred embodiment, Figure 5 , Fig. 9 as well as Fig.10 As shown in , a notch 3011 is provided at the upper portion of the front end of the side beam 301, and the rear end of the front subframe 4 is inserted into the notch 3011 and connected with the side beam 301 and the sill beam 1. Here, the notch 3011 at the front end of the side beam 301 is provided to facilitate the connection of the rear end of the front subframe 4 with the side beam 301 and the sill beam 1, thereby enabling the collision force of the front subframe 4 to be transmitted backwards through the side beam 301 and the sill beam 1 at the same time, which is conducive to improving the force transmission effect.

[0062] In terms of detailed structure, Figure 7 As shown in the figure, the front sub-frame 4 in this embodiment includes front sub-frame longitudinal beams 402 arranged on the left and right sides, and a sub-frame rear cross beam 401 connected to the rear ends of the two front sub-frame longitudinal beams 402 and arranged close to the battery pack 200. The front sub-frame front cross beam 404 and the front sub-frame middle cross beam 403 are respectively connected to the front ends and the middle parts of the two front sub-frame longitudinal beams 402.

[0063] The two ends of the front subframe front cross beam 404 also extend outward from the front subframe longitudinal beam 402, and the two ends of the front subframe front cross beam 404 are respectively connected to the bottom of the front end of the front longitudinal beam 504. In order to further improve the connection strength of the front subframe 4, the two ends of the front subframe middle cross beam 403 are respectively provided with extension arms 4031 extending upward, and the top end of the extension arm 4031 is connected to the bottom of the rear end of the front longitudinal beam 504.

[0064] The arrangement of the front sub-frame 4 in this embodiment enables the front sub-frame 4 to participate in the transmission of the front end collision force, and the front sub-frame 4 has a plurality of annular force transmission structures arranged front and rear, thereby facilitating the absorption and dispersion of the collision force, and thereby facilitating the collision safety of the front part of the cabin.

[0065] In this embodiment, both left and right ends of the rear cross beam 401 of the front subframe extend toward the outside of the vehicle along the left and right direction of the vehicle, and the left and right ends of the rear cross beam 401 of the front subframe are respectively inserted into the recesses 3011 and connected with the side beams 301 and the door sill beam 1.

[0066] Due to the setting of the notch 3011, an installation space for the end of the sub-frame rear cross beam 401 to be installed is formed between the front end of the sill beam 1 and the front end of the side beam 301. The front end and the left and right sides of the installation space are open to facilitate the installation of the end of the sub-frame rear cross beam 401, so that the end of the sub-frame rear cross beam 401 is located between the front end of the sill beam 1 and the front end of the side beam 301.

[0067] like Figure 6 and Fig.10 As shown in , the lower vehicle body frame 100 further includes a front lower cross beam 505 and a rear floor front cross beam 506 disposed between the sill beams 1 on both sides. A torsion box 503 is disposed at the bottom of the front lower cross beam 505, and an energy absorption cavity is formed between the two. An outer connecting plate 508 is disposed on the outer side of each torsion box 503, and the torsion box 503 and the outer connecting plate 508 on the same side are connected together in the left-right direction of the vehicle and are connected together to the bottom of the front lower cross beam 505.

[0068] 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. This arrangement is conducive to the front end collision force borne by the front longitudinal beam 504 being transmitted to the torsion box 503 and the outer connecting plate 508, and then being absorbed and continuously transmitted backwards, thereby improving the dispersion transmission effect of the collision force.

[0069] Further, such as Fig.10As shown in , the torsion box 503 has a clamping portion 5031 clamped between the sill beam 1 and the front subframe rear cross beam 401. The torsion box 503 is connected to the sill beam 1, the front subframe rear cross beam 401 and the side beam 301 in the vertical direction of the whole vehicle through the clamping portion 5031.

[0070] Preferably, the width of the torsion box 503 is gradually increased from the front to the rear, and the clamping portion 5031 is formed by extending from the rear end of the torsion box 503 to the outside of the vehicle. The clamping portion 5031 has a simple structure, is easy to process and form, and is convenient to be arranged between the sill beam 1 and the rear cross beam 401 of the front subframe. At the same time, it is also convenient to further disperse and transmit the collision force between the side beam 301 and the sill beam 1.

[0071] To facilitate the connection between the side beam 301, the rear end of the front subframe 4 and the door sill beam 1, as shown in FIG. Figures 7 to 10 As shown in , a plurality of second nuts are provided on the inner side of the bottom wall at the front end of the sill beam 1, and the plurality of second nuts are also arranged at intervals along the front-rear direction of the vehicle. Corresponding to the second nuts, second through holes are provided at the bottom of the sill beam 1 and the clamping portion 5031, a connecting column corresponding to each second through hole is provided at the end of the rear cross beam 401 of the subframe, and a second matching hole is provided in the connecting column, and a third matching hole corresponding to the second matching hole is provided at the front end of the side beam 301, and the second bolt 106 passes through the third matching hole, the second matching hole and the second through hole in sequence, and is screwed and connected with the second nut, thereby realizing the connection between the side beam 301, the rear end of the front subframe 4 and the sill beam 1.

[0072] like Fig.11 As shown in FIG. 1 , an extension portion 103 is provided on the side of the sill beam 1 close to the outside of the vehicle. The extension portion 103 extends downward and is located on the side of the side beam 301 close to the outside of the vehicle. In this embodiment, by providing the extension portion 103 on the sill beam 1, the gap between the sill beam 1 and the side beam 301 can be shielded, which not only helps to improve the sealing effect, but also improves the aesthetics.

[0073] In terms of specific structure, Fig.11 As shown in the figure, the threshold beam 1 includes an inner plate 101 and an outer plate 102 which are connected by buckling on the left and right sides, and a reinforcing plate 107 which is arranged at the inner front end of the outer plate 102 and corresponds to the A-pillar. The outer side of the bottom of the inner plate 101 is folded downward to form a lower flange, and the bottom of the reinforcing plate 107 extends downward to the outer side of the lower flange and is welded to the lower flange. The extension part 103 is specifically composed of the lower flange and the reinforcing plate 107 located on the outer side of the lower flange. The extension part 103 here has a simple structure and is easy to be processed and formed on the threshold beam 1.

[0074] In order to improve the performance of the threshold beam 1, in this embodiment, a reinforcement member 104 is provided in the threshold beam 1, and the reinforcement member 104 is connected between the side walls on the left and right sides of the threshold beam 1. Preferably, the reinforcement member 104 is box-shaped, and forms a cavity with the threshold beam 1. Here, the box-shaped reinforcement member 104 is provided in the threshold beam 1, and the structural strength of the threshold beam 1 can be improved by utilizing the high strength of the box-shaped structure, thereby facilitating the improvement of the rigidity and crash resistance of the entire vehicle.

[0075] In terms of specific structure, Fig.12 As shown in the figure, three reinforcement members 104 are arranged at intervals at the rear of the threshold beam 1. The three reinforcement members 104 are arranged corresponding to the threshold beam 1 between the front and rear door openings, and are arranged at intervals in the threshold beam 1 along the front and rear direction of the vehicle. Each reinforcement member 104 has a top wall located at the top, and a peripheral wall connected to the front, rear and outer sides of the top wall. The bottom of the reinforcement member 104 and the side facing the interior of the vehicle are both open. Of course, the number and position of the reinforcement members 104 can still be adjusted according to the use requirements.

[0076] To facilitate the installation of the reinforcement member 104, Fig.13 As shown, the front wall and thick wall of the reinforcement 104 are provided with an outwardly turned connection flange 1041, which is overlapped on the threshold beam 1 and welded to the threshold beam 1. As the reinforcement 104 is connected to the threshold beam 1, each opening on the reinforcement 104 is blocked by the threshold beam 1, and a cavity is formed between each reinforcement 104 and the threshold beam 1. In this way, the characteristic of the cavity that can improve the structural strength is utilized, which is beneficial to improve the structural strength of the threshold beam 1 between the front and rear door openings, and is beneficial to improve the dispersion and transmission effect of the threshold beam 1 on the collision force.

[0077] In addition, in order to further improve the structural strength of the reinforcement member 104, a plurality of reinforcement ribs 1042 may be provided on the reinforcement member 104. Fig.13 As shown in , the reinforcing ribs 1042 are respectively arranged on the front wall and the rear wall of the reinforcing member 104. The reinforcing ribs 1042 here all extend along the left and right directions of the whole vehicle, which is not only conducive to processing and forming, but also has a better use effect. Of course, in specific implementation, the shape, quantity and position of the reinforcing member 104 and the reinforcing ribs 1042 thereon can be adjusted according to the use requirements.

[0078] As a preferred embodiment, Figure 4 and Figure 6As shown in , the lower body frame 100 includes a floor beam connected between the door sill beams 1 on both sides, and the battery pack 200 has a battery pack beam 305 connected between the side beams 301 on both sides. The battery pack beam 305 is arranged correspondingly to the floor beam up and down and connected together. Here, the battery pack beam 305 is arranged correspondingly to the floor beam up and down and connected together, which can improve the installation strength of the battery pack 200. At the same time, the external force borne by the battery pack 200 can also be transmitted to the floor beam, and the force transmission can be dispersed together, which can reduce the damage to the battery pack 200 and protect the battery cells inside the battery pack 200.

[0079] In terms of detailed structure, Figure 4 and Figure 6 As shown, the floor beams in this embodiment are two that are spaced apart and connected in the middle between the door sill beams 1 on both sides along the front-to-back direction of the vehicle, and the battery pack beam 305 is arranged one-to-one with each floor beam. For the convenience of distinguishing the description, the floor beam arranged in the front is called the front floor beam 501, and the floor beam arranged in the rear is called the rear floor beam 502. The front floor beam 501 is provided with a mounting structure for installing the front row of seats, and the rear floor beam 502 is provided with a mounting structure for installing the rear row of seats. The floor beams in this embodiment are preferably processed and formed by rolling, which is conducive to improving the structural strength and force transmission effect of the rear floor beam.

[0080] Preferably, the battery pack cross beam 305 is detachably connected to the floor cross beam to facilitate loading and unloading of the battery pack 200. For example, the battery pack cross beam 305 is screwed to the floor cross beam, and of course, the two can also adopt other connection structures that are easy to disassemble.

[0081] like Figure 4 and Figure 6 As shown in , each floor beam is provided with a plurality of third through holes arranged at intervals along the left-right direction of the vehicle, and a plurality of third matching holes corresponding to each third through hole are provided on the battery pack beam 305. The third bolt 307 passes through the third matching hole and the third through hole and is screwed with the third nut, thereby realizing the connection between the floor beam and the corresponding battery pack beam 305. It can be understood that the number of battery pack beams 305 and floor beams in this embodiment can also be adaptively increased or decreased as long as the use requirements are met.

[0082] As a preferred embodiment, the structure of the battery pack cross beam 305 in this embodiment is roughly the same as that of the side beam 301, and a cavity is also provided therein. Each cavity is provided with a plurality of partitions 3012 arranged in a horizontal and vertical staggered manner, so that each cavity has a plurality of sub-cavities 3013.

[0083] Here, the cavity structure has a high structural strength, and the stacked arrangement of the sub-cavities 3013 has a good force transmission effect, which is conducive to further improving the structural strength and torsional rigidity of the battery pack cross beam 305, thereby improving the collision performance of the side battery pack cross beam 305 and the safety of the battery pack 200. At the same time, the arrangement of the sub-cavities 3013 in the battery pack cross beam 305 is also conducive to reducing the weight of the battery pack 200, thereby facilitating the lightweight design of the lower body structure.

[0084] like Figure 7 As shown in the figure, a sealing strip 6 is provided between the lower body frame 100 and the battery pack frame 3. The sealing strip 6 is provided to ensure the sealing effect between the top surface of the battery pack 200 and the lower body frame 100, so that the top surface of the battery pack body 2 constitutes a floor panel. Compared with the conventional CTB structure, the front floor panel is completely eliminated, and the weight and cost are reduced.

[0085] Among them, Figure 7 As shown in , the sealing strip 6 includes two side portions 601 forming a ring, and a front portion 602 and a rear portion 603 disposed between the side portions 601 on both sides, and the side portion 601 is disposed below the door sill beam 1, the front portion 602 is disposed below the front enclosure lower cross beam 505, and the rear portion 603 is disposed below the rear floor front cross beam 506. Disposing each part of the sealing strip 6 below the front enclosure lower cross beam 505, the rear floor front cross beam 506 or the door sill beam 1 with good rigidity can improve the rigidity of the sealing position, prevent the sealing strip 6 from deforming, and help improve the sealing effect.

[0086] Specifically, if Figure 7 As shown in , the lower cross beam 505 of the front wall extends forward from the front end of the battery pack 200 to the bottom of the front wall panel 5, and the lower cross beam 505 of the front wall is connected with the top surface of the battery pack body 2 to improve its use effect as a floor. Figures 14 to 16 As shown in , the rear portion of the front lower cross beam 505 is provided with a rear flange 5051 folded backward, and the front portion 602 is specifically located below the rear flange 5051 and between the battery pack body 2. The rear flange 5051 is provided here, which is not only conducive to improving the structural strength of the front lower cross beam 505, but also conducive to improving the compression effect on the sealing strip 6, thereby preventing the deformation of the sealing strip 6, and further ensuring the sealing performance of the sealing strip 6.

[0087] Further, such as Fig.14 and Fig.15As shown, the rear ends of the two torsion boxes 503 on the left and right sides are respectively lapped on the bottom surface of the rear flanging 5051 and are welded to the rear flanging 5051. The front part 602 of the sealing strip 6 is specifically located between the torsion box 503 and the battery pack body 2. This is conducive to improving the connection strength between the front lower cross beam 505 and the torsion box 503, and further conducive to improving the transmission and dispersion effects of collision forces.

[0088] To ensure the pressing effect of the rear flanging 5051 on the sealing strip 6, a protruding part 5052 that protrudes downward is provided on the rear flanging 5051 between the rear ends of the two torsion boxes 503. The bottom surface of the protruding part 5052 and the bottom surface of the torsion box 503 cooperate to press the front part 602 of the sealing strip 6, which is conducive to ensuring the sealing performance of the sealing strip 6, thereby ensuring the effect when the top surface of the battery pack body 2 is used as a floor.

[0089] In this embodiment, corresponding to the front rear cross beam 506 of the rear floor, a battery pack rear cross beam 306 that is detachably connected to the front rear cross beam 506 of the rear floor is provided between the two side sills 301 on both sides. The rear part 603 is located in front of the battery pack rear cross beam 306. The connection between the battery pack rear cross beam 306 and the front rear cross beam 506 of the rear floor is conducive to further improving the pressing effect of the front rear cross beam 506 of the rear floor on the rear part 603. Here, the battery pack rear cross beam 306 and the front rear cross beam 506 of the rear floor are connected by a plurality of fourth bolts 308.

[0090] In addition, as Figure 7 shown, a connecting plate 507 is provided at the front end of the middle part of the front floor cross beam 501. The connecting plate 507 extends forward along the front-rear direction of the whole vehicle to the bottom of the front apron 5 and is connected to both the front lower cross beam 505 and the battery pack body 2. Among them, the cross section of the connecting plate 507 is in the shape of two "ji" characters connected left and right. Here, a cavity that is separated left and right is formed among the connecting plate 507, the battery pack body 2, the front floor cross beam 501, the front apron 5, and the front lower cross beam 505.

[0091] In this embodiment, by setting the connecting plate 507, it is conducive to forming a force transmission path between the bottom of the front apron 5 and the middle part of the front floor cross beam 501, and the connecting plate 507 has a relatively high structural strength, which is conducive to the collision force transmitted to the front apron passing through the connecting plate 507, the sill beam 1, and the side sill 301 and being transmitted backward at the same time, which is conducive to improving the force transmission performance of the lower body structure to the collision force, thereby further improving the collision safety of the vehicle.

[0092] Furthermore, as Fig.15 and Fig.16As shown in FIG, a support protrusion 5053 convexly arranged upward is provided on the front lower cross beam 505, corresponding to the concave portion 5071 in the middle of the connecting plate 507, and the concave portion 5071 in the middle of the connecting plate 507 specifically abuts against the support protrusion 5053. Here, the support protrusion 5053 and the concave portion 5071 cooperate to improve the structural strength of the front lower cross beam 505 and the connection effect between the front lower cross beam 505 and the connecting plate 507.

[0093] The lower body structure of this embodiment optimizes the specifications of the battery pack 200 so that the battery pack 200 is connected to the door sill beam 1, which is beneficial to increasing the capacity of the battery pack 200 and the longitudinal cross-sectional area of ​​the battery pack 200, thereby improving the rigidity and crash resistance of the vehicle. When the vehicle is hit from the side, it can effectively protect the safety of the battery cells in the battery pack 200, play a good protective effect on the battery cells in the battery pack 200, and make the vehicle's handling stability higher, thereby helping to improve the safety of the vehicle.

[0094] In addition, the present embodiment also relates to a vehicle, on which the above-mentioned lower body structure is provided. The vehicle in the present embodiment is provided with the above-mentioned lower body structure, which is beneficial to improving the safety of the battery pack 200 and the vehicle.

[0095] 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 protection scope of the present invention.

Claims

1. A lower vehicle body structure, characterized in that: It comprises a lower body frame (100), and a battery pack (200) arranged at the bottom of the lower body frame (100); The lower vehicle body frame (100) comprises a sill beam (1) disposed on the left and right sides, and the battery pack (200) comprises a battery pack frame (3) and a battery pack body (2) disposed in the battery pack frame (3); The battery pack frame (3) has side beams (301) arranged on the left and right sides, the side beams (301) on each side are located below the threshold beam (1) on the corresponding side and are connected to the threshold beam (1) on the corresponding side, and the side beams (301) and the battery pack body (2) have the same height in the vertical direction of the vehicle.

2. The lower vehicle body structure according to claim 1, 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).

3. The lower vehicle body structure according to claim 1, characterized in that: The upper portion of the front end of the side beam (301) is provided with a notch (3011); The rear end of the front subframe (4) is inserted into the notch (3011) and connected to the side beam (301) and the door sill beam (1).

4. The lower vehicle body structure according to claim 1, characterized in that: The inner side surface of the side beam (301) is arranged flush with the inner side surface of the door sill beam (1).

5. The lower vehicle body structure according to claim 1, characterized in that: The side beam (301) has a plurality of cavities arranged in sequence along the left-right direction of the vehicle, and each cavity extends along the length direction of the side beam (301); At least one of the cavities is provided with a partition (3012), and the partition (3012) divides the cavity into a plurality of sub-cavities (3013) stacked up and down.

6. The lower vehicle body structure according to claim 1, characterized in that: The side of the door sill beam (1) close to the outside of the vehicle is provided with an extension portion (103); The extension portion (103) extends downward and is located on a side of the side beam (301) close to the outside of the vehicle.

7. The lower vehicle body structure according to claim 1, characterized in that: A reinforcing member (104) is provided inside the threshold beam (1), and the reinforcing member (104) is connected between the side walls on the left and right sides of the threshold beam (1); The reinforcement member (104) is box-shaped and forms a cavity with the door sill beam (1).

8. The lower vehicle body structure according to claim 1, characterized in that: The lower vehicle body frame (100) comprises a floor crossbeam connected between the sill beams (1) on both sides, and the battery pack (200) comprises 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.

9. The lower vehicle body structure according to any one of claims 1 to 8, characterized in that: The lower vehicle body frame (100) further comprises a front enclosure lower cross beam (505) and a rear floor front cross beam (506) arranged between the sill beams (1) on both sides, and a sealing strip (6) is arranged between the lower vehicle body frame (100) and the battery pack frame (3); The sealing strip (6) includes two side portions (601) forming a ring shape, and a front portion (602) and a rear portion (603) arranged between the side portions (601) on both sides, and the side portions (601) are arranged below the door sill beam (1), the front portion (602) is arranged below the front enclosure lower cross beam (505), and the rear portion (603) is arranged below the rear floor front cross beam (506).

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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