Body components and vehicles having them

Abstract

This utility model discloses a vehicle body component and a vehicle having the same, relating to the field of vehicle body technology. Two rear floor longitudinal beams are spaced apart along the width direction of the vehicle. A rear floor crossbeam connects the two rear floor longitudinal beams, and the crossbeam and the two longitudinal beams together create an installation space suitable for accommodating the vehicle floor or power battery. Each rear floor longitudinal beam has an outward protrusion that protrudes away from the other longitudinal beam. Therefore, by making the rear floor longitudinal beam protrude away from the other longitudinal beam, in the event of a collision, the protrusion induces the rear floor longitudinal beam to be less prone to fracture. This facilitates the orderly crushing of the rear floor longitudinal beam to absorb and dissipate the enormous collision kinetic energy. Furthermore, it improves the stiffness and strength of the rear floor longitudinal beam, thus enhancing vehicle safety performance. In addition, the outward protrusion does not encroach on battery or floor space, resulting in efficient space utilization.

Description

Technical Field

[0001] This utility model relates to the field of vehicle body technology, and in particular to a vehicle body component and a vehicle having the same. Background Technology

[0002] In related technologies, the rear floor longitudinal beam of the vehicle body components is poorly designed and is prone to breakage during a collision. A broken rear floor longitudinal beam cannot effectively transfer collision energy or absorb collision loads, which seriously affects the safety performance of the vehicle. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a vehicle body assembly that improves vehicle safety performance.

[0004] This utility model further proposes a vehicle having the above-mentioned body components.

[0005] A vehicle body assembly according to an embodiment of the present invention includes: two rear floor longitudinal beams, the two rear floor longitudinal beams being spaced apart along the width direction of the vehicle; a rear floor center crossbeam, the rear floor center crossbeam being connected between the two rear floor longitudinal beams, the rear floor center crossbeam and the two rear floor longitudinal beams together surrounding an installation space, the installation space being adapted to accommodate the vehicle floor or a power battery; the rear floor longitudinal beams are formed with an outward protrusion, the outward protrusion protruding in a direction away from the other rear floor longitudinal beam.

[0006] According to the vehicle body assembly of this utility model embodiment, by forming a protruding portion of the rear floor longitudinal beam that is opposite to another rear floor longitudinal beam, the rear floor longitudinal beam is less likely to break during a collision due to the convexity of the protruding portion. This facilitates the orderly crushing of the rear floor longitudinal beam to absorb and dissipate the huge collision kinetic energy. Furthermore, it can improve the stiffness and strength of the rear floor longitudinal beam, which is beneficial to improving the vehicle's safety performance. In addition, the outward protrusion will not encroach on the battery or floor space, and the space is used rationally.

[0007] According to some embodiments of this application, the two rear floor longitudinal beams are arranged in a mirror-symmetrical manner. The rear floor longitudinal beams include: a first longitudinal beam segment and a second longitudinal beam segment. The first longitudinal beam segment has the outward protrusion. The first longitudinal beam segment is connected to the second longitudinal beam segment. The distance between the two first longitudinal beam segments is smaller than the distance between the two second longitudinal beam segments.

[0008] According to some embodiments of this application, the rear floor longitudinal beam further includes a connecting segment, which connects the first longitudinal beam segment and the second longitudinal beam segment, and the distance between the two connecting segments gradually increases from the end of the connecting segment connected to the first longitudinal beam segment to the end of the connecting segment connected to the second longitudinal beam segment.

[0009] According to some embodiments of this application, the rear floor longitudinal beam is formed with reinforcing ribs that protrude along the height direction of the vehicle.

[0010] According to some embodiments of this application, the rear floor longitudinal beam and the rear floor middle cross beam are laser welded together.

[0011] According to some embodiments of this application, the vehicle body assembly further includes: two rear subframe mounting support plates, which are laser-welded to both ends of the crossbeam in the rear floor, and the two rear subframe mounting support plates are laser-welded to the two longitudinal beams of the rear floor respectively.

[0012] According to some embodiments of this application, the vehicle body assembly further includes: two longitudinal beam outer plates, which are laser-welded to the rear ends of the two rear floor longitudinal beams along the length of the vehicle, and at least two of the longitudinal beam outer plates, the rear floor longitudinal beams, the rear floor middle crossbeam, and the rear subframe mounting support plate have different thicknesses.

[0013] According to some embodiments of this application, the thickness of the longitudinal beam of the rear floor is A, satisfying the relationship: 1.6mm≤A≤2mm; and / or, the thickness of the transverse beam in the rear floor is B, satisfying the relationship: 1.0mm≤B≤1.6mm.

[0014] According to some embodiments of this application, the thickness of the outer plate of the longitudinal beam is C, satisfying the relationship: 1.6mm≤C≤2mm; and / or, the thickness of the rear subframe mounting support plate is D, satisfying the relationship: 2.0mm≤D≤2.5mm.

[0015] The vehicle according to an embodiment of this application includes the aforementioned body assembly. By forming the body assembly into a single structure and forming an outward protrusion in the rear floor longitudinal beam, the outward protrusion can absorb and transfer the collision load in the event of a collision, and the outward protrusion can deform to absorb the collision energy, thereby reducing the risk of the rear floor longitudinal beam breaking and protecting battery safety.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of a vehicle body assembly according to an embodiment of the present utility model;

[0019] Figure 2 This is a partial structural schematic diagram of a vehicle body component according to an embodiment of the present utility model.

[0020] Figure label:

[0021] Rear floor longitudinal beam 1; Outward protrusion 11; First longitudinal beam segment 12; Second longitudinal beam segment 13; Connecting segment 14; Reinforcing rib 15;

[0022] 2. Rear floor crossbeam; 3. Rear subframe mounting support plate; 4. Longitudinal beam outer plate; 5. Installation space;

[0023] Body component 10. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following is for reference. Figure 1 and Figure 2 This invention describes a vehicle body assembly 10 and a vehicle having the same, according to embodiments of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the vehicle body assembly 10 according to an embodiment of the present utility model includes: two rear floor longitudinal beams 1 and a rear floor middle cross beam 2. The two rear floor longitudinal beams 1 are spaced apart along the width direction of the vehicle. The rear floor middle cross beam 2 is connected between the two rear floor longitudinal beams 1. The rear floor middle cross beam 2 and the two rear floor longitudinal beams 1 together surround an installation space 5. The installation space 5 is suitable for accommodating the vehicle floor or power battery. The rear floor longitudinal beams 1 have an outward protrusion 11, which protrudes in a direction away from the other rear floor longitudinal beam 1.

[0027] Both rear floor longitudinal beams 1 can be along the length of the vehicle (i.e., Figure 1 Extending in the X direction (as shown), along the width direction of the vehicle (i.e., Figure 1 As shown in the Y direction, two rear floor longitudinal beams 1 are spaced apart. A rear floor crossbeam 2 can extend along the width direction of the vehicle and connects between the two rear floor longitudinal beams 1 to form an integral floor frame, giving the body assembly 10 a complete force transmission channel and improving the collision performance of the body assembly 10. As some embodiments of this application, the rear floor crossbeam 2 can be welded to the two rear floor longitudinal beams 1. The rear floor crossbeam 2 and the two rear floor crossbeams 2 together surround an installation space 5, which can be used to house the vehicle floor or a power battery.

[0028] Both rear floor longitudinal beams 1 have outward protrusions 11, which protrude in a direction away from the other rear floor longitudinal beam 1, or in other words, along the width direction of the vehicle (i.e. Figure 1 As shown in the Y direction, the protrusion 11 protrudes in a direction away from the mounting space 5. When a vehicle collision occurs, the rear floor longitudinal beam 1 is less likely to break due to the convexity of the protrusion 11. The rear floor longitudinal beam 1 can effectively absorb and transfer collision loads, and the stiffness and strength of the rear floor longitudinal beam 1 can be improved without significantly increasing the material thickness. In addition, the protrusion 11 protrudes outward, so when the mounting space 5 is used to accommodate the vehicle floor, the protrusion 11 will not encroach on the interior space, which is beneficial for the vehicle to have a larger space. When the mounting space 5 is used to accommodate the vehicle's power battery, the protrusion 11 will not encroach on the power battery mounting space 5, which is beneficial for the vehicle to be equipped with a power battery with a larger capacity, thereby improving the vehicle's driving range.

[0029] In the above embodiment, by forming a protruding outward convex portion 11 opposite to another rear floor longitudinal beam 1, the rear floor longitudinal beam 1 is less likely to break during a collision due to the protrusion of the outward convex portion 11. This facilitates the orderly crushing of the rear floor longitudinal beam 1 to absorb and dissipate the huge collision kinetic energy. Furthermore, it can improve the stiffness and strength of the rear floor longitudinal beam 1, which is beneficial to improving the vehicle's safety performance. In addition, the outward protrusion will not encroach on the battery or floor space, and the space is used rationally.

[0030] In some embodiments of this application, such as Figure 1 As shown, the two rear floor longitudinal beams 1 are arranged in a mirror symmetrical manner. The rear floor longitudinal beam 1 includes: a first longitudinal beam segment 12 and a second longitudinal beam segment 13. The first longitudinal beam segment 12 has an outward protrusion 11. The first longitudinal beam segment 12 is connected to the second longitudinal beam segment 13. The distance between the two first longitudinal beam segments 12 is smaller than the distance between the two second longitudinal beam segments 13.

[0031] The rear floor longitudinal beam 1 may include a first longitudinal beam segment 12 and a second longitudinal beam segment 13. The first longitudinal beam segment 12 may be connected to the second longitudinal beam segment 13. The two rear floor longitudinal beams 1 may be mirror-symmetrically arranged about the vehicle's central axis. The distance between the two first longitudinal beam segments 12 may be less than the distance between the two second longitudinal beam segments 13. The distance between the two first longitudinal beam segments 12 is suitable for accommodating the vehicle's floor or power battery. In other words, the two first longitudinal beam segments 12 and the rear floor crossbeam 2 together surround the installation space 5.

[0032] Along the longitudinal direction of the vehicle, the first longitudinal beam segment 12 can be located in front of the second longitudinal beam segment 13. The first longitudinal beam segment 12 can form an outward protrusion 11. This arrangement allows for a reasonable placement of the outward protrusion 11, making it less prone to breakage of the rear floor longitudinal beam 1. It also facilitates the orderly crushing of the rear floor longitudinal beam 1 to absorb and dissipate the enormous kinetic energy of a collision. Furthermore, the outward protrusion does not encroach on the battery or floor space. The distance between the two first longitudinal beam segments 12 is smaller than the distance between the two second longitudinal beam segments 13. This arrangement allows for a larger distance between the two second longitudinal beam segments 13, thereby providing the vehicle with a larger trunk space to meet storage needs.

[0033] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the rear floor longitudinal beam 1 also includes a connecting section 14, which is connected between the first longitudinal beam section 12 and the second longitudinal beam section 13. The distance between the two connecting sections 14 gradually increases from the end of the connecting section 14 connected to the first longitudinal beam section 12 to the end of the connecting section 14 connected to the second longitudinal beam section 13.

[0034] The connecting section 14 can connect the first longitudinal beam section 12 and the second longitudinal beam section 13. As some embodiments of this application, the first longitudinal beam section 12, the connecting section 14, and the second longitudinal beam section 13 can be integrally formed. The first longitudinal beam section 12 and the second longitudinal beam section 13 are staggered along the length of the vehicle. By setting the connecting section 14, the first longitudinal beam section 12 and the second longitudinal beam section 13 can be connected as one unit. From the end where the connecting section 14 connects to the first longitudinal beam section 12 to the end where it connects to the second longitudinal beam section 13, the distance between the two connecting sections 14 gradually increases. This arrangement allows the first longitudinal beam section 12 and the second longitudinal beam section 13, which are staggered along the length of the vehicle, to be connected by the connecting section 14. This makes the distance between the two first longitudinal beam sections 12 of the two rear floor longitudinal beams 1 suitable for installing the vehicle floor or power battery, and makes the distance between the two second longitudinal beam sections 13 of the two rear floor longitudinal beams 1 meet the trunk space requirements, thus making the structure of the two rear floor longitudinal beams 1 more reasonable.

[0035] In some embodiments of this application, such as Figure 2 As shown, the rear floor longitudinal beam 1 is provided with a reinforcing rib 15, which protrudes along the height direction of the vehicle.

[0036] Among them, the reinforcing rib 15 can protrude along the height direction of the vehicle. The reinforcing rib 15 can protrude upward or downward. The reinforcing rib 15 can be used to strengthen the structural strength of the rear floor longitudinal beam 1 and improve the support capacity of the rear floor longitudinal beam 1 after collision deformation, so as to reduce the risk of the rear floor longitudinal beam 1 breaking due to collision.

[0037] In some embodiments of this application, the rear floor longitudinal beam 1 and the rear floor middle cross beam 2 are laser welded together.

[0038] The rear floor longitudinal beam 1 and the rear floor middle cross beam 2 can be connected by laser welding. Compared with spot welding, laser welding can reduce the number of parts (such as reducing reinforcing parts and overlapping parts), and can eliminate the spot welding and overlapping structure between parts, reducing the overall vehicle weight and material consumption. It can also simplify the stamping process. Furthermore, laser welding has high welding precision and smooth weld seams, which can improve the collision performance and load-bearing capacity of the body component 10. By using laser welding to connect the rear floor longitudinal beam 1 and the rear floor middle cross beam 2, related parts can be omitted, achieving the effect of weight reduction and cost reduction, which is conducive to realizing lightweight design.

[0039] In some embodiments of this application, such as Figure 2 As shown, the body assembly 10 also includes: two rear subframe mounting support plates 3, which are laser-welded to both ends of the rear floor crossbeam 2, and the two rear subframe mounting support plates 3 are laser-welded to the two rear floor longitudinal beams 1 respectively.

[0040] Among them, the two rear subframe mounting support plates 3 can be laser-welded to both ends of the rear floor crossbeam 2. The two rear subframe mounting support plates 3 can be laser-welded to the two rear floor longitudinal beams 1 respectively, so that the rear floor crossbeam 2 can be connected to the two rear floor longitudinal beams 1 through the two rear subframe mounting support plates 3. This structure is reasonable and facilitates the connection of the rear floor crossbeam 2 to the two rear floor longitudinal beams 1. It can also reduce the forming and precision requirements of the rear floor crossbeam 2 and the rear floor longitudinal beams 1. Compared with spot welding, laser welding can reduce the number of parts (such as reducing reinforcements, overlapping parts, etc.) and can eliminate the spot welding overlapping structure between parts, reducing the overall vehicle weight and material consumption. At the same time, it can simplify the stamping process. In addition, laser welding has high welding precision and smooth weld seams, which can improve the collision performance and load-bearing capacity of the body component 10.

[0041] In some embodiments of this application, such as Figure 2 As shown, the body assembly 10 also includes: two longitudinal beam outer plates 4, which are laser-welded to the rear ends of the two rear floor longitudinal beams 1 along the length of the vehicle, and at least two of the longitudinal beam outer plates 4, the rear floor longitudinal beams 1, the rear floor middle crossbeam 2, and the rear subframe mounting support plate 3 have different thicknesses.

[0042] Along the length of the vehicle, the two longitudinal beam outer plates 4 can be laser-welded to the rear ends of the two rear floor longitudinal beams 1 respectively. Compared with spot welding, laser welding can reduce the number of parts (such as reducing reinforcements, overlapping parts, etc.) and can eliminate the spot welding overlapping structure between parts, reducing the weight of the whole vehicle and material consumption. At the same time, it can simplify the stamping process. Furthermore, laser welding has high welding precision and smooth weld seams, which can improve the collision performance and load-bearing capacity of the body component 10.

[0043] Furthermore, at least two of the following components—the outer longitudinal beam 4, the rear floor longitudinal beam 1, the rear floor middle crossbeam 2, and the rear subframe mounting support plate 3—have different thicknesses. This arrangement allows for adjustments to the load-bearing capacity of different areas as needed, resulting in a more rational structure, which is beneficial for weight reduction and cost reduction, and improves the reliability of the body components 10.

[0044] Understandably, the two rear floor longitudinal beams 1, the rear floor middle crossbeam 2, the two longitudinal beam outer plates 4, and the two rear subframe mounting support plates 3 form an integral floor ring structure. This integral floor ring structure is manufactured using laser welding technology, which offers numerous advantages such as weight reduction, tooling cost reduction, product cost reduction, and performance improvement. Specifically, by integrating the rear floor longitudinal beams 1 and the rear floor middle crossbeam 2, the material thickness can be optimally distributed, while reducing spot welding overlaps, resulting in less raw material consumption and a 15% to 20% weight reduction for the product. Through integrated design, multiple components are combined into one, and multiple sets of molds and fixtures are integrated into one, reducing overall tooling costs by 10% to 20%. Flexible welding and integrated cutting improves material utilization, increases production cycle time, and reduces stamping and welding processes, lowering processing costs and reducing overall product costs by 5% to 15%. Integrating multiple parts into one improves product precision, shortens the development cycle, and strengthens the product. This solution is an integral structure with continuous force transmission, high load-bearing capacity, high connection strength, and improved safety performance.

[0045] In some embodiments of this application, the thickness of the rear floor longitudinal beam 1 is A, satisfying the relationship: 1.6mm≤A≤2mm; and / or, the thickness of the rear floor transverse beam 2 is B, satisfying the relationship: 1.0mm≤B≤1.6mm.

[0046] The thickness of the rear floor longitudinal beam 1 can be A, where A satisfies the relationship: 1.6mm≤A≤2mm. A can be 1.6mm, 1.8mm, 2.0mm, etc. The thickness of the rear floor longitudinal beam 1 can be designed according to actual needs (strength requirements, load-bearing capacity requirements) to make the thickness of the rear floor longitudinal beam 1 more reasonable, so that the rear floor longitudinal beam 1 is not easily deformed or bent during a collision, thereby ensuring the safety of the battery or floor during the collision process, reducing safety risks, and improving the reliability of the rear floor longitudinal beam 1.

[0047] The thickness of the crossbeam 2 in the rear floor is B, which satisfies the relationship: 1.0mm≤B≤1.6mm. B can be 1.0mm, 1.3mm, 1.6mm, etc. The thickness of the crossbeam 2 in the rear floor can be designed according to actual needs (strength requirements, load-bearing capacity requirements) to make the thickness of the crossbeam 2 in the rear floor more reasonable, ensuring the vehicle's load-bearing capacity while taking into account lightweight considerations, so as to improve the reliability of the crossbeam 2 in the rear floor.

[0048] In some embodiments of this application, the thickness of the outer plate 4 of the longitudinal beam is C, satisfying the relationship: 1.6mm≤C≤2mm; and / or, the thickness of the rear subframe mounting support plate 3 is D, satisfying the relationship: 2.0mm≤D≤2.5mm.

[0049] The thickness of the outer plate 4 of the longitudinal beam is C, which satisfies the relationship: 1.6mm≤C≤2mm. C can be 1.6mm, 1.8mm, 2.0mm, etc. The thickness of the outer plate 4 of the longitudinal beam can be designed according to actual needs (strength requirements, load-bearing capacity requirements) to make the thickness of the outer plate 4 of the longitudinal beam more reasonable, so that the outer plate 4 of the longitudinal beam is not easily deformed or bent during the collision, thereby ensuring the safety of the battery or floor during the collision process, reducing safety risks, and improving the reliability of the outer plate 4 of the longitudinal beam.

[0050] The thickness of the rear subframe mounting support plate 3 is D, which satisfies the relationship: 2.0mm≤D≤2.5mm. D can be 2.0mm, 2.3mm, 2.5mm, etc. The thickness of the rear subframe mounting support plate 3 can be designed according to actual needs (strength requirements, load-bearing capacity requirements) to make the thickness of the rear subframe mounting support plate 3 more reasonable. While ensuring connection strength and vehicle load-bearing capacity, it is necessary to ensure that the body is not easily deformed or bent during a collision, reduce the risk of breakage of the rear floor longitudinal beam 1, and improve the reliability of the body component 10.

[0051] The vehicle according to an embodiment of this application includes the body assembly 10 of the above embodiment. By forming a protruding outward convex portion 11 opposite to another rear floor longitudinal beam 1, the rear floor longitudinal beam 1 is less prone to fracture during a collision due to the convex induction of the outward convex portion 11. This facilitates the orderly crushing of the rear floor longitudinal beam 1 to absorb and dissipate the huge collision kinetic energy. Furthermore, it can improve the stiffness and strength of the rear floor longitudinal beam 1, which is beneficial to improving the vehicle's safety performance. In addition, the outward protrusion does not encroach on the battery or floor space, and the space is used rationally.

[0052] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0054] In the description of this utility model, "multiple" means two or more.

[0055] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0056] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle body assembly (10) characterized by, include: Two rear floor longitudinal beams (1) are provided at intervals along the width direction of the vehicle; The rear floor crossbeam (2) is connected between the two rear floor longitudinal beams (1). The rear floor crossbeam (2) and the two rear floor longitudinal beams (1) together surround the installation space (5), which is suitable for accommodating the floor or power battery of the vehicle. The rear floor longitudinal beam (1) has an outward protrusion (11) that protrudes in a direction away from the other rear floor longitudinal beam (1).

2. The body assembly (10) according to claim 1, characterized in that The two rear floor longitudinal beams (1) are arranged in a mirror symmetrical manner. The rear floor longitudinal beam (1) includes a first longitudinal beam segment (12) and a second longitudinal beam segment (13). The first longitudinal beam segment (12) has the outward protrusion (11). The first longitudinal beam segment (12) is connected to the second longitudinal beam segment (13). The distance between the two first longitudinal beam segments (12) is smaller than the distance between the two second longitudinal beam segments (13).

3. The vehicle body assembly (10) according to claim 2, characterized in that, The rear floor longitudinal beam (1) further includes a connecting section (14), which is connected between the first longitudinal beam section (12) and the second longitudinal beam section (13). The distance between the two connecting sections (14) gradually increases from the end of the connecting section (14) connected to the first longitudinal beam section (12) to the end of the connecting section (14) connected to the second longitudinal beam section (13).

4. The vehicle body assembly (10) according to claim 1, characterized in that, The rear floor longitudinal beam (1) is provided with reinforcing ribs (15) which protrude along the height direction of the vehicle.

5. The vehicle body assembly (10) according to claim 1, characterized in that, The rear floor longitudinal beam (1) and the rear floor middle cross beam (2) are laser welded together.

6. The vehicle body assembly (10) according to claim 1, characterized in that, Also includes: Two rear subframe mounting support plates (3) are laser-welded to both ends of the crossbeam (2) in the rear floor, and the two rear subframe mounting support plates (3) are laser-welded to the two longitudinal beams (1) of the rear floor respectively.

7. The vehicle body assembly (10) according to claim 6, characterized in that, Also includes: Two longitudinal beam outer plates (4) are laser-welded to the rear ends of the two rear floor longitudinal beams (1) along the length direction of the vehicle, and at least two of the longitudinal beam outer plates (4), the rear floor longitudinal beams (1), the rear floor middle crossbeams (2), and the rear subframe mounting support plate (3) have different thicknesses.

8. The vehicle body assembly (10) according to claim 7, characterized in that, The thickness of the rear floor longitudinal beam (1) is A, which satisfies the relationship: 1.6mm≤A≤2mm; And / or, the thickness of the crossbeam (2) in the rear floor is B, satisfying the relationship: 1.0mm≤B≤1.6mm.

9. The vehicle body assembly (10) according to claim 7, characterized in that, The thickness of the outer plate (4) of the longitudinal beam is C, which satisfies the relationship: 1.6mm≤C≤2mm; And / or, the thickness of the rear subframe mounting support plate (3) is D, satisfying the relationship: 2.0mm≤D≤2.5mm.

10. A vehicle, characterized in that, Includes the body assembly (10) according to any one of claims 1-9.

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