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 battery pack, a rear suspension assembly, a front floor assembly and a rear floor assembly. The rear suspension assembly is arranged on the rear floor assembly, and the front floor assembly is connected with the rear floor assembly in the X direction. The rear supporting face of the rear floor assembly is flush with the front supporting face of the front floor assembly in the Z direction, and the battery pack is arranged on the front supporting face of the front floor assembly and the rear supporting face of the rear floor assembly. The battery pack can be directly arranged on the rear supporting surface of the rear floor assembly and the front supporting surface of the front floor assembly without using a bracket for installation, so that the safety of the battery can be effectively guaranteed, and meanwhile, the endurance of the vehicle can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle manufacturing, and in particular to an underbody structure and a vehicle. Background Art

[0002] Currently, the rear subframe in the vehicle's lower body structure occupies the installation space of the rear floor assembly. In order to facilitate the assembly of the rear suspension on the rear subframe, the rear floor needs to be raised in the Z direction relative to the front floor. As a result, there is a step difference between the rear floor and the front floor, which limits the expansion space of the battery pack and further limits the vehicle's endurance.

[0003] In addition, current battery packs are usually installed above the front floor and the rear floor through a bracket. Due to the step difference between the rear floor and the front floor, the height of the bracket is very high and its strength cannot be guaranteed. If it is changed to a solid structure, the overall weight will be too large, which will further affect the improvement of the vehicle's endurance.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The present application provides a lower vehicle body structure and a vehicle to solve the technical problems that the existing battery pack is easily affected in strength by installing it through a bracket and the improvement of the vehicle's endurance is limited.

[0006] The first aspect of the utility model provides an underbody structure, including a battery pack, a rear suspension assembly, a front floor assembly and a rear floor assembly; the rear suspension assembly is arranged on the rear floor assembly, and the front floor assembly is connected to the rear floor assembly in the X direction; the rear support surface of the rear floor assembly is arranged flush with the front support surface of the front floor assembly in the Z direction, and the battery pack is arranged on the front support surface of the front floor assembly and the rear support surface of the rear floor assembly.

[0007] In this solution, by making the rear support surface of the rear floor assembly flush with the front support surface of the front floor assembly in the Z direction, the step difference between the rear floor and the front floor is effectively eliminated, providing a flatter and continuous installation surface for the battery pack, which not only optimizes the layout of the bottom space of the vehicle, but also improves the utilization of the space. The battery pack is directly arranged on the front support surface of the front floor assembly and the rear support surface of the rear floor assembly, so that the battery pack can be supported more evenly, thereby enhancing the installation stability of the battery pack. In addition, due to the flatness of the installation surface, the contact between the battery pack and the floor is closer, which helps to reduce vibration and noise. Since the rear support surface of the rear floor assembly is flush with the front support surface of the front floor assembly in the Z direction, the battery pack can be directly arranged on the rear support surface of the rear floor assembly and the front support surface of the front floor assembly without the need for a bracket, thereby effectively ensuring the safety of the battery and improving the vehicle's endurance.

[0008] In a further solution of the utility model, the rear floor assembly includes: a rear floor body having a rear support surface; a pair of mounting longitudinal beams symmetrically arranged on the rear floor body; and a mounting cross beam, with both ends respectively connected to the corresponding mounting longitudinal beams in the Y direction and connected to the battery pack in the Z direction.

[0009] In this solution, a pair of mounting longitudinal beams are symmetrically arranged on the rear floor body, and a mounting crossbeam is connected to these longitudinal beams to form a stable support frame, which significantly enhances the structural strength and stability of the rear floor assembly, enables it to withstand greater loads and impact forces, and improves the overall safety performance of the vehicle. The design of the mounting crossbeam allows it to be directly connected to the battery pack in the Z direction, providing a stable and solid support for the battery pack, which can effectively prevent the battery pack from displacement or vibration during driving, ensuring the safety and stability of the battery pack. At the same time, due to the connection between the mounting crossbeam and the mounting longitudinal beam, the installation position of the battery pack is also clearly fixed, which simplifies the installation process and improves the installation accuracy.

[0010] In a further embodiment of the present invention, the rear floor assembly includes: a rear floor body having a rear support surface; and a pair of mounting longitudinal beams symmetrically arranged on the rear floor body and connected to the battery pack in the Z direction.

[0011] In this solution, the installation longitudinal beams are symmetrically arranged on the rear floor body, which not only strengthens the local strength of the rear floor, but also provides direct and stable support for the battery pack thereon, ensuring the stability and safety of the battery pack during installation and use. The installation longitudinal beam directly connects the battery pack in the Z direction, which simplifies the installation process of the battery pack, reduces the additional brackets or structures required for installation, and reduces the complexity and weight of the vehicle. The direct connection method also ensures a close fit between the battery pack and the rear floor, reducing vibration and noise. Since the installation longitudinal beam directly supports the battery pack, no additional brackets or structures are required, thus improving the space utilization of the bottom of the vehicle.

[0012] In a further embodiment of the present invention, the front floor assembly includes: a front floor body having a front support surface and connected to the rear floor body in the X direction; and a pair of threshold beams connected to both sides of the front floor body in the Y direction and connected to both sides of the battery pack in the Z direction.

[0013] In this solution, sill beams are provided on both sides of the front floor body and connected to the front floor body in the Y direction and to both sides of the battery pack in the Z direction. The sill beams not only provide additional support for the battery pack, but also form a more stable frame together with the front floor body, thereby improving the rigidity and safety of the entire lower body structure. The sill beams are directly connected to both sides of the battery pack in the Z direction, providing a more stable support for the battery pack, allowing the battery pack to be more evenly distributed on the front floor assembly, reducing the risk of battery pack displacement or damage due to vibration or impact, while also simplifying the installation process of the battery pack and improving installation accuracy and efficiency.

[0014] In a further embodiment of the present invention, the battery pack includes: a battery body, which is arranged on the front support surface of the front floor assembly and the rear support surface of the rear floor assembly; and a pair of first connecting parts, which protrude from the battery body and are connected to the corresponding mounting longitudinal beams in the Z direction.

[0015] In this solution, a first connecting portion protrudes from the battery body and is connected to the corresponding mounting longitudinal beam in the Z direction, so that a stable connection is formed between the battery pack and the lower body structure, making it less likely for the battery pack to shift or vibrate during driving, thereby improving the stability and safety of the battery pack. The battery body is arranged on the front supporting surface of the front floor assembly and the rear supporting surface of the rear floor assembly, making full use of the space at the bottom of the vehicle, which not only ensures that the battery pack can be stably installed on the lower body structure, but also helps to lower the center of gravity of the vehicle and improve driving stability.

[0016] In a further solution of the present invention, the battery pack further includes a pair of second connecting portions, which protrude from the battery body in the Y direction and are connected to corresponding threshold beams in the Z direction.

[0017] In a further solution of the utility model, the front floor structure also includes: a seat cross beam, both ends of which are arranged on the door sill beam and connected to the battery pack in the Z direction; and a front lower cross beam, both ends of which are arranged on the door sill beam and connected to the battery pack in the Z direction.

[0018] In this solution, the second connection part protrudes from the battery body in the Y direction and connects to the corresponding threshold beam in the Z direction, so that a direct connection is established between the battery pack and the threshold beam, which enhances the stability of the battery pack inside the vehicle, especially the dynamic stability during driving, and reduces the risk of displacement or damage of the battery pack due to vibration or impact. The second connection part not only provides an additional support point for the battery pack, but also forms a stable support structure together with the mounting longitudinal beams on the front floor assembly and the rear floor assembly, so that the battery pack can be more evenly distributed on the lower body structure, further improving the stability and safety of the battery pack.

[0019] In a further solution of the utility model, the battery pack also includes a third connecting portion, the third connecting portion is arranged to protrude from the battery body in the X direction, the lower cross beam of the front enclosure is connected to the third connecting portion in the Z direction, and the seat cross beam is connected to the battery body in the Z direction.

[0020] In this solution, the addition of seat crossbeams and lower crossbeams on the front panel provides additional support points for the battery pack, especially enhancing the stability of the battery pack in the Z direction, so that the battery pack can better withstand vibration and impact during driving, improving the safety and reliability of the battery pack. The setting of seat crossbeams and lower crossbeams on the front panel not only enhances the support of the battery pack, but also optimizes the space utilization at the bottom of the vehicle. The layout and size of the crossbeams have been carefully designed so that the battery pack can fit more closely to the floor assembly, reducing unnecessary space waste and improving the space utilization of the entire vehicle.

[0021] In a further embodiment of the utility model, the rear suspension assembly includes: a first lateral tie rod, which is extended in the Y direction and connected to the mounting longitudinal beam; a second lateral tie rod, which is parallel to the first lateral tie rod and connected to the mounting longitudinal beam; and a longitudinal tie rod, which is connected to the rear floor and movably connected to the first lateral tie rod.

[0022] In this solution, the first tie rod and the second tie rod are extended in the Y direction and are connected in parallel to the mounting longitudinal beam, thereby significantly enhancing the lateral stability of the vehicle. During vehicle driving, especially when turning or changing lanes, the tie rod can effectively prevent the body from rolling and improve the vehicle's handling and stability.

[0023] A second aspect of the utility model provides a vehicle, comprising the lower vehicle body structure provided by the first aspect of the utility model.

[0024] In summary, the lower vehicle body structure and the vehicle provided by the present application have at least the following beneficial effects:

[0025] By making the rear support surface of the rear floor assembly flush with the front support surface of the front floor assembly in the Z direction, the step difference between the rear floor and the front floor is effectively eliminated, which not only provides a flatter and continuous installation surface for the battery pack installation, but also optimizes the layout of the vehicle bottom space, which can reserve more installation space for the battery pack, thereby expanding the battery capacity to improve the vehicle's endurance. The battery pack is directly set on the front support surface of the front floor assembly and the rear support surface of the rear floor assembly. This design allows the battery pack to be supported more evenly, thereby enhancing the installation stability of the battery pack. In addition, due to the flatness of the installation surface, the contact between the battery pack and the floor is closer, which helps to reduce vibration and noise. Since the rear support surface of the rear floor assembly is flush with the front support surface of the front floor assembly in the Z direction, the battery pack can be directly set on the rear support surface of the rear floor assembly and the front support surface of the front floor assembly without the need to use a bracket for installation, thereby effectively ensuring battery safety and improving vehicle endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of the lower vehicle body provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure after removing the battery pack provided in an embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of a lower vehicle body structure provided by another embodiment of the present application;

[0030] Figure 4 A schematic diagram of a structure after removing the battery pack provided by another embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of the connection between the rear floor longitudinal beam and the battery pack provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of the connection between the threshold beam and the battery pack provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of the connection between the seat crossbeam and the battery pack provided in an embodiment of the present application;

[0034] Figure 8A schematic diagram of the structure of the connection between the lower cross beam of the front enclosure and the battery pack provided in an embodiment of the present application.

[0035] The reference numerals are as follows:

[0036] 100, battery pack; 110, first connection portion; 120, second connection portion; 130, third connection portion; 140, battery body;

[0037] 200, front floor assembly; 210, front enclosure lower cross beam; 220, seat cross beam; 230, front floor body; 240, door sill beam;

[0038] 300, rear floor assembly; 310, rear floor body; 320, install longitudinal beams; 330, install cross beams;

[0039] 400, rear suspension assembly; 410, longitudinal tie rod; 420, first transverse tie rod; 430, second transverse tie rod. DETAILED DESCRIPTION

[0040] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear to indicate the orientation or position relationship, unless otherwise specified, they are understood to be based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, if there is a feature defined as "first" or "second", it is only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Features defined as "first" or "second" may explicitly or implicitly include at least one of the defined features. If the description of "plurality" appears, the general meaning is to include at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0044] Please refer to Figure 1 In a first aspect, the utility model provides a lower vehicle body structure, including a battery pack 100, a rear suspension assembly 400, a front floor assembly 200 and a rear floor assembly 300; the rear suspension assembly 400 is arranged on the rear floor assembly 300, and the front floor assembly 200 is connected to the rear floor assembly 300 in the X direction; the rear support surface of the rear floor assembly 300 is arranged flush with the front support surface of the front floor assembly 200 in the Z direction, and the battery pack 100 is arranged on the front support surface of the front floor assembly 200 and the rear support surface of the rear floor assembly 300.

[0045] In this solution, by making the rear support surface of the rear floor assembly 300 flush with the front support surface of the front floor assembly 200 in the Z direction, the step difference between the rear floor and the front floor is effectively eliminated, which not only provides a flatter and continuous installation surface for the installation of the battery pack 100, but also optimizes the layout of the bottom space of the vehicle, and can reserve more installation space for the battery pack 100, thereby expanding the battery capacity to improve the vehicle's endurance. The battery pack 100 is directly set on the front support surface of the front floor assembly 200 and the rear support surface of the rear floor assembly 300, so that the battery pack 100 can be supported more evenly, thereby enhancing the installation stability of the battery pack 100. In addition, due to the flatness of the installation surface, the contact between the battery pack 100 and the floor is closer, which helps to reduce vibration and noise. In addition, since the rear support surface of the rear floor assembly 300 and the front support surface of the front floor assembly 200 are arranged flush in the Z direction, the battery pack 100 can be directly set on the rear support surface of the rear floor assembly 300 and the front support surface of the front floor assembly 200 without the need for additional bracket installation, thereby effectively ensuring battery safety and improving vehicle endurance.

[0046] Please continue to refer to Figure 1 Combined with Figure 2In an alternative embodiment, the rear floor assembly 300 includes: a rear floor body 310 having a rear support surface; and a pair of mounting longitudinal beams 320 symmetrically disposed on the rear floor body 310 and connected to the battery pack 100 in the Z direction.

[0047] In this solution, the longitudinal beam 320 is symmetrically arranged on the rear floor body 310, which not only strengthens the local strength of the rear floor assembly 300, but also provides direct and stable support for the battery pack 100 thereon, ensuring the stability and safety of the battery pack 100 during installation and use. The longitudinal beam 320 is directly connected to the battery pack 100 in the Z direction, which simplifies the installation process of the battery pack 100, reduces the additional brackets or structures required for installation, and reduces the complexity and weight of the entire vehicle. The direct connection method also ensures a close fit between the battery pack 100 and the rear floor body 310, reducing vibration and noise. Since the longitudinal beam 320 directly supports the battery pack 100 without the need for additional brackets or structures, the space utilization rate at the bottom of the vehicle is improved, thereby reserving more installation space for the battery pack 100, and further expanding the battery capacity to improve the vehicle's endurance.

[0048] Please refer to Figure 3-Figure 5 In another embodiment, the rear floor assembly 300 includes: a rear floor body 310 having a rear support surface; a pair of mounting longitudinal beams 320 symmetrically arranged on the rear floor body 310; and a mounting cross beam 330, both ends of which are respectively connected to the corresponding mounting longitudinal beams 320 in the Y direction and connected to the battery pack 100 in the Z direction.

[0049] In this solution, a pair of mounting longitudinal beams 320 are symmetrically arranged on the rear floor body 310, and a mounting crossbeam 330 is connected to these mounting longitudinal beams 320 to form a stable support frame, which significantly enhances the structural strength and stability of the rear floor assembly 300, enables it to withstand greater loads and impact forces, and improves the overall safety performance of the vehicle. The design of the mounting crossbeam 330 allows it to be directly connected to the battery pack 100 in the Z direction, providing a stable and solid support for the battery pack 100, which can effectively prevent the battery pack 100 from displacement or vibration during driving, ensuring the safety and stability of the battery pack 100. At the same time, due to the connection between the mounting crossbeam 330 and the mounting longitudinal beam 320, the installation position of the battery pack 100 is also clearly fixed, which simplifies the installation process and improves the installation accuracy.

[0050] Please refer to Figure 6 In a further embodiment, the front floor assembly 200 includes: a front floor body 230 having a front support surface and connected to the rear floor body 310 in the X direction; and a pair of sill beams 240 connected to both sides of the front floor body 230 in the Y direction and connected to both sides of the battery pack 100 in the Z direction.

[0051] In this solution, by arranging sill beams 240 on both sides of the front floor body 230 and connecting them to the front floor body 230 in the Y direction and connecting them to both sides of the battery pack 100 in the Z direction, the sill beams 240 not only provide additional support for the battery pack 100, but also form a more stable frame together with the front floor body 230, thereby improving the rigidity and safety of the entire lower vehicle body structure. The sill beams 240 are directly connected to both sides of the battery pack 100 in the Z direction, providing a more stable support for the battery pack 100, so that the battery pack 100 can be more evenly distributed on the front floor assembly 200, reducing the risk of displacement or damage of the battery pack 100 due to vibration or impact, and simplifying the installation process of the battery pack 100, thereby improving installation accuracy and efficiency.

[0052] In a further embodiment, the battery pack 100 includes: a battery body 140, which is disposed on the front support surface of the front floor assembly 200 and the rear support surface of the rear floor assembly 300; and a pair of first connecting parts 110, which protrude from the battery body 140 and are connected to the corresponding mounting longitudinal beams 320 in the Z direction.

[0053] In this solution, a first connecting portion 110 protrudes from the battery body 140 and is connected to the corresponding mounting longitudinal beam 320 in the Z direction, so that a stable connection is formed between the battery pack 100 and the lower body structure, making it difficult for the battery pack 100 to shift or vibrate during driving, thereby improving the stability and safety of the battery pack 100. The battery body 140 is arranged on the front supporting surface of the front floor assembly 200 and the rear supporting surface of the rear floor assembly 300, making full use of the space at the bottom of the vehicle, which not only ensures that the battery pack 100 can be stably installed on the lower body structure, but also helps to lower the center of gravity of the vehicle and improve driving stability.

[0054] In a further embodiment, the battery pack 100 further includes a pair of second connection portions 120 , and the second connection portions 120 are arranged to protrude from the battery body 140 in the Y direction and are connected to corresponding door sill beams 240 in the Z direction.

[0055] Please refer to Figure 7 and Figure 8 In a further embodiment, the front floor structure further includes: a seat cross beam 220, both ends of which are disposed on the door sill beam 240 and connected to the battery pack 100 in the Z direction; and a front lower cross beam 210, both ends of which are disposed on the door sill beam 240 and connected to the battery pack 100 in the Z direction.

[0056] In this solution, the second connection part 120 protrudes from the battery body 140 in the Y direction and connects to the corresponding threshold beam 240 in the Z direction, so that a direct connection is established between the battery pack 100 and the threshold beam 240, which enhances the stability of the battery pack 100 inside the vehicle, especially the dynamic stability during driving, and reduces the risk of displacement or damage of the battery pack 100 due to vibration or impact. The second connection part 120 not only provides an additional support point for the battery pack 100, but also forms a stable support structure together with the mounting longitudinal beams 320 on the front floor assembly 200 and the rear floor assembly 300, so that the battery pack 100 can be more evenly distributed on the lower body structure, further improving the stability and safety of the battery pack 100.

[0057] In a further embodiment, the battery pack 100 further includes a third connection portion 130, which is arranged to protrude from the battery body 140 in the X direction, the front lower cross beam 210 is connected to the third connection portion 130 in the Z direction, and the seat cross beam 220 is connected to the battery body 140 in the Z direction.

[0058] In this solution, the addition of the seat cross beam 220 and the front lower cross beam 210 provides additional support points for the battery pack 100, and especially enhances the stability of the battery pack 100 in the Z direction, so that the battery pack 100 can better withstand vibration and impact during driving, thereby improving the safety and reliability of the battery pack 100. The setting of the seat cross beam 220 and the front lower cross beam 210 not only enhances the support of the battery pack 100, but also optimizes the space utilization at the bottom of the vehicle. The layout and size of the cross beams are carefully designed, so that the battery pack 100 can fit more closely to the floor assembly, reducing unnecessary space waste and improving the space utilization of the entire vehicle.

[0059] In a further embodiment, the rear suspension assembly 400 includes: a first lateral tie rod 420, which is extended in the Y direction and connected to the mounting longitudinal beam 320; a second lateral tie rod 430, which is parallel to the first lateral tie rod 420 and connected to the mounting longitudinal beam 320; and a longitudinal tie rod 410, which is connected to the rear floor body 310 and movably connected to the first lateral tie rod 420.

[0060] In this solution, the first lateral tie rod 420 and the second lateral tie rod 430 are extended in the Y direction and are connected in parallel to the mounting longitudinal beam 320, thereby significantly enhancing the lateral stability of the vehicle. During vehicle driving, especially when turning or changing lanes, the first lateral tie rod 420 and the second lateral tie rod 430 can effectively prevent the roll of the vehicle body and improve the handling and stability of the vehicle.

[0061] A second aspect of the utility model provides a vehicle, comprising the lower vehicle body structure provided by the first aspect of the utility model.

[0062] It should be noted that the X direction, Y direction, and Z direction in the present invention refer to the length direction, width direction, and height direction of the vehicle, respectively. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can change, modify, replace, and modify the above embodiments within the scope of the present application.

Claims

1. A lower vehicle body structure, characterized in that: It comprises a battery pack (100), a rear suspension assembly (400), a front floor assembly (200) and a rear floor assembly (300); The rear suspension assembly (400) is arranged on the rear floor assembly (300), and the front floor assembly (200) is connected to the rear floor assembly (300) in the X direction; The rear support surface of the rear floor assembly (300) is arranged flush with the front support surface of the front floor assembly (200) in the Z direction, and the battery pack (100) is arranged on the front support surface of the front floor assembly (200) and the rear support surface of the rear floor assembly (300).

2. The lower vehicle body structure according to claim 1, characterized in that: The rear floor assembly (300) comprises: A rear floor body (310) having the rear support surface; a pair of mounting longitudinal beams (320) symmetrically arranged on the rear floor body (310); and The mounting crossbeam (330) has two ends connected to the corresponding mounting longitudinal beam (320) in the Y direction and connected to the battery pack (100) in the Z direction.

3. The lower vehicle body structure according to claim 1, characterized in that: The rear floor assembly (300) comprises: a rear floor body (310) having the rear support surface; and A pair of mounting longitudinal beams (320) are symmetrically arranged on the rear floor body (310) and connected to the battery pack (100) in the Z direction.

4. The lower vehicle body structure according to claim 2 or 3, characterized in that: The front floor assembly (200) comprises: A front floor body (230) having the front support surface and connected to the rear floor body (310) in the X direction; and A pair of sill beams (240) are connected to both sides of the front floor body (230) in the Y direction and connected to both sides of the battery pack (100) in the Z direction.

5. The lower vehicle body structure according to claim 4, characterized in that: The battery pack (100) comprises: A battery body (140) is arranged on a front supporting surface of the front floor assembly (200) and a rear supporting surface of the rear floor assembly (300); and A pair of first connection parts (110) are arranged to protrude from the battery body (140) and are connected to the corresponding mounting longitudinal beams (320) in the Z direction.

6. The lower vehicle body structure according to claim 5, characterized in that: The battery pack (100) further comprises a pair of second connection parts (120), wherein the second connection parts (120) are arranged to protrude from the battery body (140) in the Y direction and are connected to the corresponding door sill beams (240) in the Z direction.

7. The lower vehicle body structure according to claim 5, characterized in that: The front floor assembly (200) further includes: A seat crossbeam (220), both ends of which are arranged on the door sill beam (240) and connected to the battery pack (100) in the Z direction; and The lower cross beam (210) of the front enclosure has two ends arranged on the door sill beam (240) and connected to the battery pack (100) in the Z direction.

8. The lower vehicle body structure according to claim 7, characterized in that: The battery pack (100) further comprises a third connection portion (130), wherein the third connection portion (130) is arranged to protrude from the battery body (140) in the X direction, the front enclosure lower cross beam (210) is connected to the third connection portion (130) in the Z direction, and the seat cross beam (220) is connected to the battery body (140) in the Z direction.

9. The lower vehicle body structure according to claim 4, characterized in that: The rear suspension assembly (400) comprises: A first cross tie rod (420) extending in the Y direction and connected to the mounting longitudinal beam (320); a second tie rod (430) parallel to the first tie rod (420) and connected to the mounting longitudinal beam (320); and A longitudinal tie rod (410) is connected to the rear floor body (310) and is movably connected to the first transverse tie rod (420).

10. A vehicle, characterized in that: The invention comprises the lower vehicle body structure as claimed in any one of claims 1 to 9.

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