Vehicle body structure and vehicle

Abstract

A vehicle body structure, comprising a first side sill (3), a first side sill (3'), a first cross member (17) and a second cross member (20), wherein the first side sill (3) is arranged on a first side of the vehicle body structure, and the first side sill (3') is arranged on a second side of the vehicle body structure. The first cross member (17) is arranged between the first side sill (3) and the first side sill (3'), and two ends of the first cross member (17) are directly fixedly connected to the first side sill (3) and the first side sill (3'), respectively; and the second cross member (20) is arranged behind the first cross member (17) towards the rear of a vehicle body, and two ends of the second cross member (20) are fixedly connected to the first side sill (3) and the first side sill (3'), respectively. The first cross member (17) and the second cross member (20) are suitable for connecting to a battery pack, so as to form a closed cavity. The closed cavity is formed at the rear of the vehicle body, such that the structural strength of such a region of the vehicle body is remarkably enhanced, and damage to the region under conditions of high-speed collisions, side collisions, etc. can thus be effectively prevented, thereby effectively protecting power batteries and passengers; moreover, the torsion rigidity of a whole vehicle is improved, and the safety performance is thus higher. In addition, the present application further relates to a vehicle having the vehicle body structure.

Description

Body structure and vehicle

[0001] This application claims priority to Chinese patent applications filed on April 30, 2024, with application number 202410564643.2 and on April 26, 2024, with application number 202420898653.5, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of vehicle technology, and more specifically to a vehicle body structure and a vehicle. Background Technology

[0003] In related technologies, vehicles need to be equipped with electrical components, such as batteries and on-board chargers. The batteries provide low-voltage power to the vehicles, and the on-board chargers convert alternating current (AC) into direct current (DC) to charge the power batteries. Technical issues

[0004] The current battery placement in the vehicle body structure is not safe for the battery itself.

[0005] Therefore, there is an urgent need to design a vehicle body structure and vehicle to address the technical risks. Technical solutions

[0006] In a first aspect, this application provides a vehicle body structure, comprising: a first sill beam, a second sill beam, a first crossbeam, and a second crossbeam; the first sill beam is disposed on a first side of the vehicle body structure; the second sill beam is disposed on a second side of the vehicle body structure; the first crossbeam is disposed between the first sill beam and the second sill beam, and both ends of the first crossbeam are directly and fixedly connected to the first sill beam and the second sill beam, respectively; the second crossbeam is disposed behind the first crossbeam of the vehicle body, and both ends of the second crossbeam are fixedly connected to the first sill beam and the second sill beam, respectively; the first crossbeam and the second crossbeam are adapted to be connected to a battery pack to form a closed cavity.

[0007] Secondly, this application provides a vehicle in which the battery pack includes the aforementioned vehicle body structure. Beneficial effects

[0008] The vehicle body structure provided in this application significantly strengthens the structural strength of this area of ​​the vehicle body by forming a closed cavity at the rear of the vehicle body. This can effectively prevent damage to this area under conditions such as high-speed collisions and side-speed collisions, effectively protect the safety of the power battery and passengers, and at the same time improve the torsional rigidity of the entire vehicle, resulting in higher safety performance.

[0009] The vehicle provided in this application uses the aforementioned body structure, which improves the vehicle's safety performance. Attached Figure Description

[0010] The following drawings, illustrating embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings illustrate embodiments of this application and their descriptions, serving to explain the principles of this application. In the drawings,

[0011] Figure 1 is a perspective view of the existing vehicle body structure;

[0012] Figure 2 is a perspective view of the existing vehicle body structure;

[0013] Figure 3 is a bottom view of a vehicle body structure according to a preferred embodiment of this application;

[0014] Figure 4 is a partial perspective view of a vehicle body structure according to one embodiment of this application;

[0015] Figure 5 is a cross-sectional view along AA in Figure 4;

[0016] Figure 6 is a bottom view of a vehicle body structure according to one embodiment of this application;

[0017] Figure 7 is a cross-sectional view along BB in Figure 6;

[0018] Figure 8 is a cross-sectional view along CC in Figure 6;

[0019] Figure 9 is a partial perspective view of a vehicle body structure according to one embodiment of this application;

[0020] Figure 10 is a partial cross-sectional view of a vehicle body structure according to one embodiment of this application;

[0021] Figure 11 is a perspective view of the vehicle body structure according to an embodiment of this application, showing the structure below the vehicle body from a bottom view.

[0022] Figure 12 is a partial enlarged view of the vehicle body structure in Figure 1;

[0023] Figure 13 is a perspective view of the vehicle body structure according to an embodiment of this application, showing the structure above the vehicle body in a top view.

[0024] Figure 14 is a cross-sectional view of the box body according to an embodiment of this application;

[0025] Figure 15 is a cross-sectional view along line DD in Figure 12;

[0026] Figure 16 is a cross-sectional view along line EE in Figure 12;

[0027] Figure 17 is a cross-sectional view along line FF in Figure 12;

[0028] Figure 18 is a cross-sectional view of the vehicle body structure according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached diagram: A1: First rear longitudinal beam; A1': Second rear longitudinal beam; A2: Middle floor; A3: First sill inner panel; A3': Second sill inner panel; A4: Front floor; A5: Front-middle floor connecting beam; A6: First mounting longitudinal beam; A6': Second mounting longitudinal beam; A7: Rear section of the first sill; A7': Rear section of the second sill; A10: Rear seat mounting beam; 1: First longitudinal beam; 1': Second longitudinal beam; 2: Middle floor; 3: First sill beam; 3': Second sill beam; 4: Mounting plate; 5: Left longitudinal beam end plate; 5': Right longitudinal beam end plate; 7: Rear section of the first sill; 7': Rear section of the second sill. Section 8: Root of longitudinal beam; 9: Seal; 10: Battery pack; 11: Front section of first crossbeam; 12: Rear section of first crossbeam; 15: Mounting bracket; 16: Mounting bracket; 17: First crossbeam; 18: Gap; 19: Mounting point; 71: Straight beam section; 72: First inclined beam section; 73: First inclined beam section; 20: Second crossbeam; 21: First connecting beam; 21': Second connecting beam; 30: Rear seat anti-slip plate; 31: Rear seat crossbeam; 41: Front seat crossbeam; M: First cavity; N: Second cavity; P: Third cavity; S: Fourth cavity; R: Fifth cavity; Q: Closed cavity.4': Front floor 5A: Floor 50: Left sill reinforcement plate 60: Seat anti-slip plate 51: Sill reinforcement plate connecting plate 22: Wheel arch reinforcement plate 23: Wheel arch outer plate 24: C-pillar inner plate 25: C-pillar reinforcement plate 26: Side wall upper beam reinforcement plate 27: Top cover crossbeam 100: Box body 101: Cover plate 102: Box body mounting plate 103: Box body connecting plate 104: Front flange 105: Mounting bracket 106: Rear flange 107: Reinforcing rib H: Circular structure.

[0030] Implementation methods of this application

[0031] This application discloses a vehicle body structure and a vehicle.

[0032] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings.

[0033] The existing vehicle body structure is shown in Figures 1 and 2.

[0034] As shown in Figures 3 and 4, in one embodiment, a vehicle body structure includes: a first sill beam 3, a second sill beam 3', a first crossbeam 17, and a second crossbeam 20.

[0035] The first door sill beam 3 is set along the longitudinal direction of the vehicle body on the first side of the vehicle body structure;

[0036] The second door sill beam 3' is set along the longitudinal direction of the vehicle body on the second side of the vehicle body structure;

[0037] The first crossbeam 17 is arranged transversely along the vehicle body between the first sill beam 3 and the second sill beam 3', and the two ends of the first crossbeam 17 are directly fixedly connected to the first sill beam 3 and the second sill beam 3' respectively.

[0038] The second crossbeam 20 is arranged laterally along the vehicle body and is located behind the first crossbeam 17. The two ends of the second crossbeam 20 are indirectly fixedly connected to the first sill beam 3 and the second sill beam 3', respectively.

[0039] The second crossbeam 20 is spaced a predetermined distance from the first crossbeam 17. The battery pack 10 can be installed through the first crossbeam 17 and the second crossbeam 20. The first crossbeam 17 and the second crossbeam 20 are adapted to be connected to the battery pack 10 to form a closed cavity Q.

[0040] In the prior art, the passenger compartment is sealed by setting a floor under the vehicle body structure. In this embodiment, the vehicle body structure eliminates the floor at this location and uses the top cover of the battery pack 10 for sealing. Compared with the prior art, this reduces one component, which can reduce the vehicle weight and manufacturing cost.

[0041] The vehicle body structure in this embodiment significantly strengthens the structural strength of this area of ​​the vehicle body by forming a closed cavity at the rear of the vehicle body. This effectively prevents damage to this area under conditions such as high-speed collisions and side-speed collisions, effectively protecting the safety of the power battery and passengers. At the same time, it improves the torsional stiffness of the entire vehicle, resulting in higher safety performance.

[0042] In one embodiment, as shown in Figures 3, 4, and 5, the vehicle body structure further includes:

[0043] Mounting plate 4 is located between the first sill beam 3 and the second sill beam 3', and is fixedly connected to the first sill beam 3, the second sill beam 3', the first crossbeam 17 and the second crossbeam 20 respectively, for example by welding. Mounting plate 4 is horizontal in shape and can be sealed to the battery pack 10. The top cover of the battery pack 10 acts as a floor, sealing the passenger compartment of the vehicle.

[0044] Mounting plate 4 is manufactured using sheet metal processes, such as hot-formed steel plates. Parts made of hot-formed steel plates are usually safety structural components in the vehicle body collision force transmission path. They are mostly required to have high strength to prevent excessive deformation and intrusion into the occupant survival space during a collision. At the same time, there are certain requirements for the toughness of the parts.

[0045] Mounting plate 4 is not flat; it is simply horizontal in shape, typically relative to the horizontal position of the vehicle body. Depending on design requirements, mounting plate 4 can have convex or concave shapes. Mounting plate 4 is also not a closed plate; depending on design requirements, it can have multiple through-holes in locations where it is not necessary to connect to or install other components.

[0046] By installing horizontal mounting plates 4 between the door sill beams, a horizontal structure is formed under the vehicle body, allowing the mounting plates 4 to extend horizontally forward and backward. Compared to the traditional CTP structure, which designs battery pack mounting beams under the front floor A4, the vehicle structure in this embodiment can flatten the entire floor, allowing the power battery pack to extend further laterally (Y-direction) along the vehicle body. This allows for the placement of larger battery packs, increasing battery range and achieving a longer driving range. Simultaneously, it improves the torsional rigidity of the entire vehicle, resulting in higher safety performance.

[0047] In one embodiment, as shown in Figures 4, 5, and 6, the vehicle body structure further includes:

[0048] The rear section 7 of the first sill is fixedly connected to the rear end of the first sill beam 3. The rear section 7 of the first sill beam is in an arc shape that gradually rises toward the rear of the vehicle body.

[0049] The rear section 7' ​​of the second sill is fixedly connected to the rear end of the second sill beam 3'. The rear section 7' ​​of the second sill is in an arc shape that gradually rises toward the rear of the vehicle body.

[0050] Mounting plate 4 is fixedly connected to the rear section 7 of the first sill and the rear section 7' ​​of the second sill, for example, by welding.

[0051] The shapes of the first sill rear section 7 and the second sill rear section 7' ​​are designed according to the needs of the vehicle body structure. Compared with processing and forming the shapes of the first sill beam 3 and the second sill beam 3' accordingly, it is easier to manufacture by adding the first sill rear section 7 and the second sill rear section 7', which can reduce manufacturing costs.

[0052] In one embodiment, as shown in Figures 4 and 5, at least a portion of the upper surface of the first crossbeam 17 is higher than the upper surfaces of the first sill beam 3 and the second sill beam 3' in the vehicle height direction. The height of the middle portion of the first crossbeam 17 is greater than the height of the first sill beam 3 and the second sill beam 3'.

[0053] This design allows for a larger cross-sectional dimension of the first crossbeam 17, thereby enhancing its structural strength.

[0054] In one embodiment, as shown in FIG4, the first crossbeam 17 includes: a straight beam segment 71, a first inclined beam segment 72, and a second inclined beam segment 73;

[0055] The upper surface of the straight beam section 71 is higher than the upper surfaces of the first threshold beam 3 and the second threshold beam 3'. The straight beam section 71 is located in the middle of the first crossbeam 17. The cross-sectional dimension of the straight beam section 71 is the largest cross-sectional dimension in the first crossbeam 17.

[0056] The first inclined beam segment 72 is disposed at the first end of the straight beam segment 71 and is fixedly connected to the first threshold beam 3; the cross-sectional dimension of the first inclined beam segment 72 gradually decreases from the straight beam segment 71 to the first threshold beam 3, and the position where the first inclined beam segment 72 is connected to the first threshold beam 3 is consistent with the first threshold beam 3 in the height direction.

[0057] The second inclined beam segment 73 is located at the second end of the straight beam segment 71 and is fixedly connected to the second threshold beam 3'. The cross-sectional dimensions of the second inclined beam segment 73 gradually decrease from the straight beam segment 71 to the second threshold beam 3'. The connection position between the second inclined beam segment 73 and the second threshold beam 3' is consistent with the second threshold beam 3' in the height direction.

[0058] By setting the first inclined beam segment 72 and the second inclined beam segment 73, a relatively stable fixed connection can be achieved between the first crossbeam 17 and the first threshold beam 3 and the second threshold beam 3', forming a stable force transmission path with better force transmission effect, and effectively transmitting and dispersing the side collision force.

[0059] The straight beam segment 71, the first inclined beam segment 72, and the second inclined beam segment 73 can be made as a single piece, for example, by stamping a profile. This can improve the structural strength of the first crossbeam 17 and avoid the risk of breakage that may occur if the segments are manufactured and then reconnected.

[0060] In one embodiment, as shown in FIG5, the first crossbeam 17 is groove-shaped with the groove opening facing downward. The groove opening of the first crossbeam 17 is horizontal. The mounting plate 4 is fixedly connected to the groove opening of the first crossbeam 17, for example, by welding.

[0061] By setting the first crossbeam 17, the connection strength between the rear section 7 of the first sill, the rear section 7' ​​of the second sill, and the mounting plate 4 is enhanced, thereby increasing the overall structural strength of the vehicle body.

[0062] In one embodiment, as shown in FIG5, the first crossbeam 17 includes:

[0063] The front section 11 of the first crossbeam has at least one Z-shaped bend in its cross section.

[0064] The rear section 12 of the first crossbeam has at least one Z-shaped bend in its cross section.

[0065] The top of the front section 11 and the top of the rear section 12 of the first crossbeam are fixedly connected, so that the cross-section of the first crossbeam 17 forms a "U"-shaped structure. The mounting plate 4 is fixedly connected to the lower side of the front section 11 and the lower side of the rear section 12 of the first crossbeam to form the first cavity M. This makes the force transmission path of this section form a beam structure with a cavity, forming a stable force transmission structure. In the event of a high-speed rear collision or a side collision, it can effectively resist damage to the battery pack 10 and the occupants' bodies. Moreover, the cavity design greatly improves the overall vehicle weight reduction.

[0066] The top of the front section 11 of the first crossbeam and the top of the rear section 12 of the first crossbeam can overlap and then be fixedly connected by welding to ensure the connection is strong.

[0067] Because the structure of the first crossbeam 17 is relatively complex, setting it into two sections makes it easier to manufacture than to process and form it as a whole, which can reduce manufacturing costs.

[0068] In one embodiment, as shown in Figures 6 and 7, the vehicle body structure further includes:

[0069] The first longitudinal beam 1 is fixedly connected to the inner side of the rear section 7 of the first threshold.

[0070] The second longitudinal beam 1' is fixedly connected to the inner side of the rear section 7' ​​of the second threshold;

[0071] Mounting plate 4 is fixedly connected to the lower side of the first longitudinal beam 1 and the lower side of the second longitudinal beam 1', for example, by welding.

[0072] The first longitudinal beam 1 and the second longitudinal beam 1' extend toward the rear of the vehicle body, mainly because the first longitudinal beam 1 and the second longitudinal beam 1' were added according to the designed vehicle body structure.

[0073] A left longitudinal beam sealing plate 5 is provided at the position where the first longitudinal beam 1 connects to the rear section 7 of the first threshold, and a right longitudinal beam sealing plate 5' is provided at the position where the second longitudinal beam 1' connects to the rear section 7' ​​of the second threshold.

[0074] In one embodiment, as shown in Figure 6, the front end of the first longitudinal beam 1 is fixedly connected to the first cross beam 17, and the front end of the second longitudinal beam 1' is fixedly connected to the first cross beam 17. This arrangement allows for the formation of a multi-beam composite connection structure in this area, creating a stable force transmission structure between them, thereby improving the structural strength of this area and the overall structural strength of the vehicle body.

[0075] In one embodiment, as shown in Figure 7, the first longitudinal beam 1 and the second longitudinal beam 1' are hollow inside, each with a second cavity N. This creates a beam structure with cavities along the force transmission path of that section, forming a stable force transmission structure. In the event of a high-speed rear-end collision or a side-speed collision, this structure can effectively resist damage to the battery pack 10 and the occupants. Furthermore, the cavity design greatly improves the overall vehicle weight reduction.

[0076] In one embodiment, as shown in Figures 6 and 8, the second crossbeam 20 is arranged transversely along the vehicle body between the first longitudinal beam 1 and the second longitudinal beam 1'. The two ends of the second crossbeam 20 are fixedly connected to the first longitudinal beam 1 and the second longitudinal beam 1', respectively. The mounting plate 4 is fixedly connected to the lower side of the second crossbeam 20, for example, by welding.

[0077] By setting the second crossbeam 20, the connection strength between the first longitudinal beam 1, the second longitudinal beam 1', and the mounting plate 4 is enhanced, which can further enhance the structural strength of the vehicle body structure.

[0078] In one embodiment, as shown in FIG6, in the vehicle body width direction, the outer width of the first longitudinal beam 1 and the second longitudinal beam 1' is smaller than the inner width of the first sill beam 3 and the second sill beam 3'.

[0079] The first end of the second crossbeam 20 is indirectly fixedly connected to the first threshold beam 3 via the first longitudinal beam 1, and the second end of the second crossbeam 20 is indirectly fixedly connected to the second threshold beam 3' via the second longitudinal beam 1'.

[0080] This configuration allows for the formation of a multi-beam composite connection structure in this area, creating a stable force transmission structure between them, thereby improving the structural strength of this area and the overall structural strength of the vehicle body.

[0081] In one embodiment, the lower side of the first crossbeam 17 and the lower side of the second crossbeam 20 are at the same height, and the first crossbeam 17 and the second crossbeam 20 together with the battery pack 10 form a closed cavity Q, which can also form a storage cavity.

[0082] The storage cavity can house functional modules such as the starting battery, forming a closed space unaffected by water immersion. After the battery pack 10 is installed, the closed cavity Q forms a sealed storage space, maximizing space utilization and providing ample installation space for environmentally sensitive modules like the starting battery, meeting water-resistant sealing requirements. Furthermore, the first crossbeam 17 and the second crossbeam 20 form a stable "U"-shaped closed-loop structure, increasing the overall stability and strength of the vehicle body. This effectively prevents damage to this area in high-speed and side-impact collisions.

[0083] In one embodiment, as shown in Figures 8, 9, and 10, the vehicle body structure further includes:

[0084] The middle floor 2 is located between the first longitudinal beam 1 and the second longitudinal beam 1';

[0085] The second crossbeam 20 is trough-shaped with the trough opening facing upwards. The middle floor 2 is fixedly connected to the upper side of the second crossbeam 20, for example, by welding. The middle floor 2 and the second crossbeam 20 combine to form a third cavity P, making the force transmission path of this section form a beam structure with a cavity, thus forming a stable force transmission structure. In the event of a high-speed rear-end collision or a side-speed collision, it can effectively resist damage to the battery pack 10 and the occupants' bodies. Moreover, the cavity design greatly improves the overall vehicle weight reduction.

[0086] In the Z-direction, the second cavity N and the third cavity P are at the same height, thus enabling the second crossbeam 20 to transmit force more effectively and stably to the first longitudinal beam 1 and the second longitudinal beam 1' in the Y-direction. Similarly, the second cavity N should also be at the same height as the first cavity M in the Z-direction, which makes the force more stable and effective in the X-direction. Therefore, with the effective connection between the first cavity M, the second cavity N, and the third cavity P, a stable closed-loop force transmission structure is formed under the seat. This stable closed-loop structure can effectively resist the transmission of forces in the X and Y directions, thereby effectively protecting the structure and the safety of the occupants.

[0087] In one embodiment, as shown in Figures 6 and 7, the vehicle body structure further includes:

[0088] The first connecting beam 21 is disposed between the first end of the second crossbeam 20 and the first longitudinal beam 1, and is fixedly connected to the first end of the second crossbeam 20 and the first longitudinal beam 1 respectively. The first connecting beam 21 is bent and has a cavity inside.

[0089] The second connecting beam 21' is located between the second end of the second crossbeam 20 and the second longitudinal beam 1', and is fixedly connected to the second end of the second crossbeam 20 and the second longitudinal beam 1' respectively. The second connecting beam 21' is bent and has a cavity inside.

[0090] In one embodiment, as shown in Figure 9, the vehicle body structure further includes:

[0091] The rear seat anti-slip plate 30 is located between the first crossbeam 17 and the second crossbeam 20, and is detachably and fixedly connected to the first crossbeam 17, the second crossbeam 20, the first longitudinal beam 1 and the second longitudinal beam 1', respectively. For example, it is fixedly connected by bolts and nuts. Mounting holes are provided on the edge of the rear seat anti-slip plate 30, and nuts are provided on the first crossbeam 17, the second crossbeam 20, the first longitudinal beam 1 and the second longitudinal beam 1' corresponding to the mounting holes. The rear seat anti-slip plate 30 is fixed by bolts.

[0092] By removing a cover plate from the middle floor 2 under the seat frame, namely the rear seat anti-slip plate 30, the removable rear seat anti-slip plate 30 can be installed after the starter battery and other related modules are installed in the final assembly. This provides a support surface and anti-slip function for the rear seats, and protects the starter battery and other modules from being affected. It also facilitates the maintenance and disassembly of related modules in the future.

[0093] In one embodiment, as shown in Figure 10, the vehicle body structure further includes:

[0094] Mounting bracket 15 is disposed between the first crossbeam 17 and the second crossbeam 20. Both ends of the mounting bracket 15 are fixedly connected to the first crossbeam 17 and the second crossbeam 20 respectively. The lower side of the mounting bracket 15 is at the same height as the lower side of the first crossbeam 17 and the lower side of the second crossbeam 20.

[0095] Mounting bracket 16, with its two ends fixedly connected to the first crossbeam 17 and the second crossbeam 20 respectively, and the lower side of mounting bracket 16 at the same height as the lower side of the first crossbeam 17 and the lower side of the second crossbeam 20.

[0096] Mounting brackets 15 and 16 can be L-shaped or C-shaped, which can improve the strength mode of the mounting brackets. By setting mounting brackets 15 and 16, the X-direction connection strength between the first crossbeam 17 and the second crossbeam 20 is increased, which can improve the resistance to the energy generated by the rear collision of the vehicle body, further protect the power battery from being crushed, and protect the safety of the passenger compartment. Mounting brackets 15 and 16 can be provided with bolts to provide a fixing base for modules such as the starting battery. The starting battery and other modules are fixed to the mounting brackets 15 and 16 by bolts.

[0097] In one embodiment, as shown in Figure 3, the vehicle body structure further includes:

[0098] The longitudinal beam root 8 is arranged transversely along the vehicle body between the first sill beam 3 and the second sill beam 3'. The two ends of the longitudinal beam root 8 are fixedly connected to the first sill beam 3 and the second sill beam 3' respectively. The front end of the mounting plate 4 is fixedly connected to the longitudinal beam root 8, for example, by welding.

[0099] In one embodiment, as shown in Figure 3, the vehicle body structure further includes:

[0100] The front crossbeam 41 of the seat is arranged transversely along the body between the first sill beam 3 and the second sill beam 3' and behind the root of the longitudinal beam 8. The two ends of the front crossbeam 41 are fixedly connected to the first sill beam 3 and the second sill beam 3' respectively. The front crossbeam 41 of the seat is groove-shaped with the groove facing down. The mounting plate 4 is fixedly connected to the lower side of the front crossbeam 41 of the seat.

[0101] The rear seat crossbeam 31 is arranged transversely along the vehicle body between the first sill beam 3 and the second sill beam 3' and behind the front seat crossbeam 41. The two ends of the rear seat crossbeam 31 are fixedly connected to the first sill beam 3 and the second sill beam 3' respectively. The rear seat crossbeam 31 is groove-shaped with the groove facing downward. The mounting plate 4 is fixedly connected to the lower side of the front seat crossbeam 41.

[0102] In one embodiment, as shown in Figure 8, the vehicle body structure further includes:

[0103] A seal 9 is disposed on the underside of the mounting plate 4 to seal the gap between the underside of the mounting plate 4 and the battery pack 10. The seal 9 can be made of sealing foam, which may include a base with adhesive material on two opposite sides. One side is bonded to the top of the battery pack 10, and the other side is bonded to the mounting plate 4, thereby sealing the gap between the underside of the mounting plate 4 and the battery pack 10.

[0104] After the battery pack 10 is installed, although it is in close contact with the mounting plate 4, it cannot be sealed. By setting the sealing element 9, the gap between the lower side of the mounting plate 4 and the battery pack 10 can be sealed to improve the sealing of the storage cavity.

[0105] Embodiments of this application also provide a vehicle, including a body and a body structure according to any one of the above embodiments, wherein the body and the body structure are connected.

[0106] The vehicle also includes a battery pack 10, which is connected to a first crossbeam 17 and a second crossbeam 20 to form a closed cavity Q.

[0107] As shown in Figures 11 to 14, the vehicle body structure of this embodiment includes a housing 100, which is adapted to accommodate electrical components. A first longitudinal beam 1 and a second longitudinal beam 1' are spaced apart in the width direction of the vehicle body, and the housing 100 is located between the first longitudinal beam 1 and the second longitudinal beam 1'.

[0108] Specifically, in this embodiment shown in Figure 14, the housing 100 is assembled from multiple plates. The housing 100 includes a housing mounting plate 42 and a housing connecting plate 103. The housing mounting plate 42 is a U-shaped plate, and the housing connecting plate 103 connects to the housing mounting plate 42, thus forming an open top shape. In other embodiments, the housing 100 can also be formed as a whole by stamping other individual plates, or directly formed by stamping a recess from the floor 5A to serve as the housing 100. The housing 100 is suitable for accommodating electrical components, such as batteries, on-board chargers, or relays. In this application, the battery is suitable for providing low-voltage power to the vehicle. Low-voltage power typically supplies power to conventional low-voltage electrical appliances such as lighting systems, entertainment systems, and windshield wipers. High-voltage power typically provides power to high-voltage equipment such as electric drive systems, DC / DC voltage converters, and electric air conditioners. Therefore, the battery is a low-voltage power source, which is different from the high-voltage power source of the power battery in the battery pack described later. An onboard charger (OBC) is used to convert alternating current (AC) into direct current (DC) to charge the battery.

[0109] In this embodiment, a cover plate 101 is also provided, which is connected to the floor 5A and closes the opening of the box 100. The cover plate 101 can be connected to the floor 5A by bolts, rivets, or other means. The cover plate 101 provides a support surface for the seat above and protects the battery inside the box 100 from damage, providing a relatively sealed environment for the box. Here, the cover plate 101 closing the opening of the box 100 does not mean that the box 100 is completely sealed; the box 100 may have pre-drilled holes for wiring, etc. The box 100 can be sealed with adhesive during the painting process to form a sealed space, meeting the requirements for water immersion sealing.

[0110] In the width direction of the vehicle body, that is, in the Y direction, there are first longitudinal beams 1 and second longitudinal beams 1' spaced apart. The box body 100 is located between the first longitudinal beam 1 and the second longitudinal beam 1'. That is to say, the box body 100 is not located in the front compartment, but is located in the passenger compartment or luggage compartment behind the front compartment.

[0111] In the embodiments of this application, since electrical components can be placed inside the housing 100, which is located between the first longitudinal beam 1 and the second longitudinal beam 1', the space environment between the first longitudinal beam 1 and the second longitudinal beam 1' behind the front cabin is better than that of the front cabin, thus providing good protection for the electrical components. The first longitudinal beam 1 and the second longitudinal beam 1' can also provide side collision, front collision and rear collision protection for the electrical components.

[0112] As shown in FIG. 11, the body structure of this embodiment further includes a second cross beam 20. In the X direction (i.e., the front-rear direction of the vehicle body), the second cross beam 20 is disposed behind the box body 100. The two ends of the second cross beam 20 are respectively connected to the first longitudinal beam 1 and the second longitudinal beam 1'. The second cross beam 20 can improve the rigidity between the first longitudinal beam 1 and the second longitudinal beam 1', enabling the body structure to have better anti-side collision performance and protecting the electrical components in the box body 100.

[0113] As shown in FIG. 11, the body structure of this embodiment further includes a mounting plate 4. In the X direction (i.e., the front-rear direction of the vehicle body), the mounting plate 4 is disposed in front of the box body 100. The two ends of the mounting plate 4 are respectively connected to the first longitudinal beam 1 and the second longitudinal beam 1'. Therefore, the mounting plate 4, the second cross beam 20, the first longitudinal beam 1 and the second longitudinal beam 1' form a "square" shape. Thus, the box body 100 is located inside the "square". The advantage of this structure is that the "square" shape forms a stable force transmission structure, which can comprehensively and effectively resist damage to the electrical components in the box body 100 during frontal collision and side collision.

[0114] As shown in FIG. 1, the body structure in this embodiment further includes a floor 5A. The floor 5A is connected to the mounting plate 4, the second cross beam 20, the first longitudinal beam 1, and the second longitudinal beam 1'. The floor 5A includes a front floor 4' and a middle floor 2. The box body 100 is disposed on the middle floor 2. The connection surfaces of the front floor 4' with the first longitudinal beam 1 and the second longitudinal beam 1', and the connection surface of the front floor 4' with the middle floor 2 are at the same height in the vehicle body height direction.

[0115] Specifically, the front floor 4' and the middle floor 2 can be two floor plates, or two parts formed by bending a single floor plate. The front floor 4' can be the floor of the passenger compartment, and the middle floor 2 can be the floor of the luggage compartment. The connection surfaces of the front floor 4' with the first longitudinal beam 1 and the second longitudinal beam 1', and the connection surface of the front floor 4' with the middle floor 2 are at the same height in the vehicle body height direction. For an electric vehicle, it can provide a larger Y-direction dimension for the battery pack 10, enabling the Y-direction dimension of the battery pack 10 to extend to the first sill beam 3 and the second sill beam 3', thereby increasing the capacity of the battery pack 10 and improving the endurance. At the same time, there is no structure lower than the floor 5A between the first sill beam 3 and the second sill beam 3', so a longer battery pack 10 can be arranged in the X direction to improve the endurance.

[0116] In this embodiment, in the vehicle body height direction, the box body 100 is located under the seat, and the projection of the box body 100 in the vehicle body height direction at least partially overlaps with the projection of the seat in the vehicle body height direction.

[0117] Specifically, the housing 100 is located below the seat, meaning it is closer to the ground or the bottom of the vehicle than the seat. The projection of the housing 100 along the vehicle's height can be a projected image of the housing 100 towards the roof or towards the ground. Similarly, the projection of the seat along the vehicle's height can also be a projected image of the seat towards the roof or towards the ground. When both the housing and the seat project onto the ground or the roof simultaneously, the two projections at least partially overlap. This structure allows the seat (not shown) to resist overhead pressure, protecting the battery inside the housing 100.

[0118] As shown in Figure 14, the housing 100 has a front flange 104 and a rear flange 106. The housing 100 overlaps with the mounting plate 4 via the front flange 104, and overlaps with the second crossbeam 20 via the rear flange 106. This structure can enhance the strength and modal characteristics of the entire "U"-shaped structure, resist the energy generated by surrounding collisions, further protect the battery from being crushed, and protect the safety of the passenger compartment.

[0119] As shown in Figure 14, a third mounting bracket 105 is provided inside the housing 100. The third mounting bracket 105 is provided with reinforcing ribs and overlaps with the front flange 104 and the rear flange 106. In the X direction, the reinforcing rib 107 extends from the position where the third mounting bracket 105 overlaps with the front flange 104 to the position where the third mounting bracket 105 overlaps with the rear flange 106.

[0120] Specifically, the third mounting bracket 105 is used to install the battery. The reinforcing ribs extending in the X direction of the third mounting bracket 105 can improve the structural strength of the entire housing 100. The third mounting bracket 105 overlaps with the front flange 104 and the rear flange 106, and can also be regarded as overlapping with the mounting plate 4 and the second crossbeam 20, to meet the strength and durability requirements of the internally installed battery.

[0121] As shown in Figure 16, in this embodiment, the housing 100 and the third mounting bracket 105 are not completely fitted together; there is a gap 18 between at least a portion of the housing 100 and the third mounting bracket 105. This gap 18 ensures both the leakage requirements during the electrophoresis process and the installation requirements of the battery, preventing bolts from directly hitting the housing 100 and damaging its seal during installation.

[0122] As shown in Figures 11, 12 and 15, the floor 5A is connected to the mounting plate 4 and the second crossbeam 20 to improve the tear resistance of the floor 5A and further protect the box 100.

[0123] More specifically, floor 5A includes a front floor 4', a middle floor 2, and a front section 11 of the first crossbeam. The front floor 4' and the middle floor 2 are connected by the front section 11 of the first crossbeam, and the front section 11 of the first crossbeam, the mounting plate 4, and the middle floor 2 overlap to form a first cavity M. The first cavity M can improve the structural strength at the mounting plate 4.

[0124] As shown in Figures 14 and 15, the vehicle body structure also includes a first crossbeam 17, both ends of which are connected to the sill beams. Specifically, one end of the first crossbeam 17 is connected to the first sill beam 3, and the other end is connected to the second sill beam 3'. The projection of the first crossbeam 17 in the vehicle height direction at least partially overlaps with the projection of the mounting plate 4 in the vehicle height direction.

[0125] Specifically, the projection of the first crossbeam 17 in the vehicle height direction can be a normal projection of the first crossbeam 17 onto the roof or the ground. Similarly, the projection of the mounting plate 4 in the vehicle height direction can also be a normal projection onto the roof or the ground. When the first crossbeam 17 and the mounting plate 4 are projected onto the roof or the ground simultaneously, the two projections at least partially overlap, enabling the first crossbeam 17 and the mounting plate 4 to jointly improve the frontal collision protection performance of the vehicle, thereby improving the safety of the box body 100.

[0126] In this embodiment, the first crossbeam 17 overlaps with the front section 11 of the first crossbeam and the mounting plate 4, forming a fourth cavity S between the first crossbeam 17 and the middle floor 2. The first cavity M and the fourth cavity S at least partially overlap in the vehicle height direction, that is, as shown in Figure 15, in the Z direction, the first cavity M is located below the fourth cavity S. The advantage of this structure is that by utilizing the double cavity structure, the vehicle body strength can be further improved.

[0127] As shown in Figure 16, the second crossbeam 20 has a Z-shaped cross section, and the second crossbeam 20 is connected to the middle floor 2 to form a third cavity P. The third cavity P can improve the structural strength of the vehicle sound at the second crossbeam 20.

[0128] As shown in Figure 18, the vehicle body structure also includes a first sill beam 3 and a second sill beam 3'. The first sill beam 3 is connected to the first longitudinal beam 1, and the second sill beam 3' is connected to the second longitudinal beam 1'. In the width direction of the vehicle body, the first sill beam 3 is located on the side of the first longitudinal beam 1 away from the housing 100, and the second sill beam 3' is located on the side of the second longitudinal beam 1' away from the housing 100. In this way, the first sill beam 3 and the second sill beam 3' improve the side impact resistance of the vehicle body structure and also protect the battery inside the housing 100.

[0129] In this embodiment, the projections of the first sill beam 3 in the vehicle width direction, the second sill beam 3' in the vehicle width direction, and the box 100 in the vehicle width direction at least partially overlap.

[0130] Specifically, the projection of the first sill beam 3 in the vehicle width direction can be a projected orthographic projection of the first sill beam 3 onto the rightmost structure of the vehicle. Similarly, the projection of the second sill beam 3' in the vehicle width direction can be a projected orthographic projection of the second sill beam 3' onto the rightmost structure of the vehicle, and the projection of the box 100 in the vehicle width direction can be a projected orthographic projection of the box 100 onto the rightmost structure of the vehicle. Alternatively, the projection of the first sill beam 3 in the vehicle width direction can be a projected orthographic projection of the first sill beam 3 onto the leftmost structure of the vehicle. Similarly, the projection of the second sill beam 3' in the vehicle width direction can be a projected orthographic projection of the second sill beam 3' onto the leftmost structure of the vehicle, and the projection of the box 100 in the vehicle width direction can be a projected orthographic projection of the box 100 onto the leftmost structure of the vehicle. When the second sill beam 3', the box 100, and the first sill beam 3 simultaneously project onto either the leftmost or rightmost structure of the vehicle, the three projections at least partially overlap, enabling the first sill beam 3 and the second sill beam 3' to protect the box 100 during a side collision.

[0131] In this embodiment, the projections of the first longitudinal beam 1 in the vehicle width direction, the second longitudinal beam 1' in the vehicle width direction, and the box 100 in the vehicle width direction at least partially overlap.

[0132] Similarly, the projections of the first longitudinal beam 1 in the vehicle width direction, the second longitudinal beam 1' in the vehicle width direction, and the box 100 in the vehicle width direction can be orthographic projections of the first longitudinal beam 1, the second longitudinal beam 1', and the box 100 onto the leftmost or rightmost structure of the vehicle body. When the first longitudinal beam 1, the box 100, and the second longitudinal beam 1' simultaneously project onto the leftmost or rightmost structure of the vehicle body, the three projections at least partially overlap, enabling the box 100 to be protected during a side collision using the first longitudinal beam 1 and the second longitudinal beam 1'.

[0133] In this embodiment, the projections of the first sill beam 3 in the vehicle width direction, the first longitudinal beam 1 in the vehicle width direction, the box 100 in the vehicle width direction, the second longitudinal beam 1' in the vehicle width direction, and the second sill beam 3' in the vehicle width direction at least partially overlap. The advantage of this structure is that it can utilize the four structures—the first longitudinal beam 1, the second longitudinal beam 1', the first sill beam 3, and the second sill beam 3'—to protect the box 100 during a side collision.

[0134] In this embodiment, a portion of each of the first sill beam 3, the first longitudinal beam 1, the housing 100, the second longitudinal beam 1', and the second sill beam 3' lies within the same plane perpendicular to the vehicle height direction. In other words, when a plane perpendicular to the Z direction is used to cut the first sill beam 3, the first longitudinal beam 1, the housing 100, the second longitudinal beam 1', and the second sill beam 3', all of these components will be simultaneously cut by the same plane. This allows the first sill beam 3, the first longitudinal beam 1, the second longitudinal beam 1', and the second sill beam 3' to protect the left and right sides of the housing 100.

[0135] As shown in Figure 17, the first sill beam 3, the first longitudinal beam 1, and the floor 5A form a second cavity N. Similarly, the first sill beam 3, the second longitudinal beam 1', and the middle floor 2 can also form a second cavity N. Likewise, the second sill beam 3', the second longitudinal beam 1', and the floor 5A can also form a second cavity N in the same way. The second cavity N can strengthen the structural strength of the vehicle body structure at the first longitudinal beam 1 and the second longitudinal beam 1'.

[0136] Specifically, in Figure 17, the first longitudinal beam 1, the first sill beam 3, and the middle floor 2 form a second cavity N. However, in other embodiments of this application, the first longitudinal beam 1 and the first sill beam 3 can also form a second cavity N with the front floor 4'. Similarly, the second sill beam 3', the second longitudinal beam 1', and the middle floor 2 can also form a second cavity N in the same manner.

[0137] As shown in Figure 17, in this embodiment, the first sill beam 3 is also connected to a left sill reinforcement plate 50, which is used to improve the sill strength. The left sill reinforcement plate 50 and the first sill beam 3 are connected to form a fifth cavity R, which can improve the sill strength. The left sill reinforcement plate 50 can also be considered as part of the first sill beam 3. Similarly, the second sill beam 3' is also connected to a right sill reinforcement plate (not shown in the figure), which can be connected to the second sill beam 3' in the same way to form a fifth cavity R. The right sill reinforcement plate can also be considered as part of the second sill beam 3'. The fifth cavity R is located on the side of the second cavity N away from the box body 100 in the vehicle width direction. In this way, the double cavity structure can be used to improve the ability of the box body 100 to resist collisions in the Y direction, thereby improving the safety inside the box body 100.

[0138] As shown in Figures 11 to 17, the first cavity M and the fourth cavity S are located in front of the box 100, the third cavity P is located behind the box 100, and the second cavity N and the fifth cavity R are located on the left or right side of the box 100. This ensures that the box 100 has good anti-collision capability in both the X and Y directions, thus improving safety.

[0139] As shown in Figure 18, the vehicle body structure of this embodiment also includes a pair of C-pillars and a roof crossbeam 27. The upper end of each C-pillar is connected to the roof crossbeam 27, the lower end of one C-pillar is connected to the first sill beam 3, and the lower end of the other C-pillar is connected to the second sill beam 3'. The second crossbeam 20, C-pillars, first sill beam 3, second sill beam 3', and roof crossbeam 27 form a closed annular structure H. This closed annular structure H can effectively improve the torsional stiffness of the entire vehicle, which is beneficial for the transmission and decomposition of the load, greatly improving the ability to resist deformation during side pillar collisions and side impacts, and protecting the safety of the occupants. The projection of the C-pillar in the width direction of the vehicle body at least partially overlaps with the projection of the box 100 in the width direction of the vehicle body.

[0140] Specifically, in this embodiment, the first sill beam 3 and the left sill reinforcement plate 50 are connected by a sill reinforcement plate connecting plate 51. The wheel arch reinforcement plate 22 is used to improve the strength of the wheel arch. The wheel arch outer plate 23 serves as the outer shape surface of the wheel arch. The C-pillar includes a C-pillar inner plate 24 and a C-pillar reinforcement plate 25, with the inner plate 24 connected to the reinforcement plate 25. On the outer side, the sill reinforcement plate connecting plate 51 is connected to the wheel arch reinforcement plate 22, the wheel arch reinforcement plate 22 is connected to the C-pillar reinforcement plate 25, and the C-pillar reinforcement plate 25 is connected to the side wall upper beam reinforcement plate 26; on the inner side, the first sill beam 3 and the second sill beam 3' are respectively connected to the left and right wheel arch outer plates 23, and the wheel arch outer plates 23 are connected to the C-pillar inner plate 24. The inner and outer parts are interlocked and welded together, and then welded to the side wall outer plate to form a complete C-pillar. The first sill beam 3 at the lower end of one C-pillar is connected to the first longitudinal beam 1 along the Y direction, and the second sill beam 3' at the lower end of the other C-pillar is connected to the second longitudinal beam 1' along the Y direction. The upper side beam reinforcement plate 26 of the C-pillar is connected to the inner C-pillar panel 24, and then to the roof crossbeam 27. Welding, riveting, and bolting are equivalent connection techniques. The C-pillar can also employ other structural forms. The vehicle body structure can also include multiple connection points 19 for mounting accessories such as reading lights and seat belts.

[0141] The ring structure H is very beneficial for improving the torsional stiffness of the whole vehicle, which is conducive to the transmission and decomposition of the torsional force, greatly improving the ability to resist deformation during side pole collisions and side impacts, and protecting the safety of the occupants.

[0142] The projection of the C-pillar in the width direction of the vehicle body can be a direct projection of the C-pillar onto the leftmost or rightmost structure of the vehicle body. Similarly, the projection of the box 100 in the width direction of the vehicle body can be a direct projection of the box 100 onto the leftmost or rightmost structure of the vehicle body. When the C-pillar and the box 100 are projected onto the leftmost or rightmost structure of the vehicle body simultaneously, the two projections at least partially overlap, which allows the C-pillar to be used to protect the box 100 in the event of a side collision.

[0143] This application also provides a vehicle, which includes the body structure described above. Electrical components such as batteries and on-board chargers can be housed within the enclosure 100, thus protecting the electrical components and enhancing the vehicle's safety.

[0144] As shown in Figure 14, the vehicle also includes a battery pack 10. In the vehicle height direction, the battery pack 10 is located below the box 100, and the projection of the box 100 in the vehicle height direction at least partially overlaps with the projection of the battery pack 10 in the vehicle height direction.

[0145] Specifically, the power battery within the battery pack 10 provides high-voltage power to the electric drive system, thereby generating driving force for the vehicle. The projection of the housing 100 in the vehicle height direction can be a normal projection of the housing 100 onto the ground or the vehicle roof; similarly, the projection of the battery pack 10 in the vehicle height direction can also be a normal projection of the battery pack 10 onto the ground or the vehicle roof. When the battery pack 10 and the housing 100 are simultaneously projected onto the ground or the vehicle roof, the two projections at least partially overlap. Thus, by utilizing the inherent strength of the battery pack 10, the ability of the battery within the housing 100 to withstand downward pressure can be improved.

[0146] In other words, the electrical components such as the battery inside the housing 100 are protected by the seat and battery pack 10 in the Z direction, by the mounting plate 4 and the second crossbeam 20 in the X direction, and by the first longitudinal beam 1 and the second longitudinal beam 1' in the Y direction, thus providing greater safety. The vehicle body structure and vehicle of this application have the following characteristics:

[0147] This application significantly strengthens the structural strength of this area of ​​the vehicle body by forming a closed cavity at the rear of the vehicle body. It can effectively prevent damage to this area under conditions such as high-speed collisions and side-speed collisions, effectively protect the safety of the power battery and passengers, and improve the torsional rigidity of the entire vehicle, thus providing higher safety performance.

[0148] This application creates a horizontal structure under the vehicle body by installing a horizontal mounting plate between the door sill beams. This mounting plate can then extend horizontally forward and backward. Compared to the traditional CTP structure, which designs the battery pack mounting beams under the front floor A4, this application can flatten the entire floor, allowing the power battery pack to extend further laterally (Y-direction) along the vehicle body. This allows for the placement of a larger battery pack, increasing battery range and achieving a longer driving range. Simultaneously, it improves the torsional rigidity of the entire vehicle, resulting in enhanced safety performance.

[0149] Compared to traditional gasoline or hybrid vehicles, the body structure of this application provides a larger battery pack space. In terms of the Y-axis dimension, the battery pack can extend to the inner sill plate, and in the X-axis dimension, it can extend all the way to the front of the rear subframe of the chassis. For models with different lengths and wheelbases, the platform can be evolved by changing the rear section of the sill beam in the X-axis dimension, while other structures remain unchanged.

Claims

1. A vehicle body structure, characterized in that, include: The first sill beam (3) is arranged along the longitudinal direction of the vehicle body on the first side of the vehicle body structure; The second sill beam (3') is arranged along the longitudinal direction of the vehicle body on the second side of the vehicle body structure; The first crossbeam (17) is arranged transversely along the vehicle body between the first sill beam (3) and the second sill beam (3'), and the two ends of the first crossbeam (17) are directly fixedly connected to the first sill beam (3) and the second sill beam (3') respectively. The second crossbeam (20) is arranged laterally along the vehicle body and is located behind the first crossbeam (17) on the vehicle body. The two ends of the second crossbeam (20) are fixedly connected to the first sill beam (3) and the second sill beam (3') respectively. The first crossbeam (17) and the second crossbeam (20) are adapted to be connected to the battery pack (10) to form a closed cavity (Q).

2. The vehicle body structure according to claim 1, characterized in that, Also includes: Mounting plate (4) is disposed between the first sill beam (3) and the second sill beam (3') and is fixedly connected to the first crossbeam (17). The mounting plate (4) is horizontal in shape and is sealed to the battery pack (10) through the mounting plate (4).

3. The vehicle body structure according to claim 1, characterized in that, In the vehicle height direction, at least a portion of the upper surface of the first crossbeam (17) is higher than the upper surfaces of the first sill beam (3) and the second sill beam (3').

4. The vehicle body structure according to claim 1, characterized in that, The lower side of the first crossbeam (17) and the lower side of the second crossbeam (20) are at the same height.

5. The vehicle body structure according to claim 1, characterized in that, The first crossbeam (17) includes: A straight beam segment (71), the upper surface of which is higher than the upper surfaces of the first threshold beam (3) and the second threshold beam (3'); The first inclined beam segment (72) is disposed at the first end of the straight beam segment (71) and is fixedly connected to the first threshold beam (3); The second inclined beam segment (73) is located at the second end of the straight beam segment (71) and is fixedly connected to the second threshold beam (3').

6. The vehicle body structure according to claim 2, characterized in that, The first crossbeam (17) is grooved with the groove opening facing downwards. The groove opening of the first crossbeam (17) is horizontal. The mounting plate (4) is fixedly connected to the groove opening of the first crossbeam (17).

7. The vehicle body structure according to claim 2, characterized in that, The first crossbeam (17) includes: The front section (11) of the first crossbeam has at least one Z-shaped bend in its cross section. The rear section (12) of the first crossbeam has at least one Z-shaped bend in its cross section. The top of the front section (11) of the first crossbeam and the top of the rear section (12) of the first crossbeam are fixedly connected, and the mounting plate (4) is fixedly connected to the lower side of the front section (11) of the first crossbeam and the lower side of the rear section (12) of the first crossbeam to form a first cavity (M).

8. The vehicle body structure according to claim 2, characterized in that, Also includes: The first longitudinal beam (1) is fixedly connected to the inner side of the first threshold beam (3); The second longitudinal beam (1') is fixedly connected to the inner side of the second threshold beam (3'); The mounting plate (4) is fixedly connected to the lower side of the first longitudinal beam (1) and the lower side of the second longitudinal beam (1').

9. The vehicle body structure according to claim 8, characterized in that, The front end of the first longitudinal beam (1) is fixedly connected to the first cross beam (17), and the front end of the second longitudinal beam (1') is fixedly connected to the first cross beam (17).

10. The vehicle body structure according to claim 8, characterized in that, The second crossbeam (20) is disposed between the first longitudinal beam (1) and the second longitudinal beam (1'), and the two ends of the second crossbeam (20) are fixedly connected to the first longitudinal beam (1) and the second longitudinal beam (1') respectively.

11. The vehicle body structure according to claim 10, characterized in that, Also includes: The first connecting beam (21) is disposed between the first end of the second crossbeam (20) and the first longitudinal beam (1), and is fixedly connected to the first end of the second crossbeam (20) and the first longitudinal beam (1) respectively. The second connecting beam (21') is disposed between the second end of the second crossbeam (20) and the second longitudinal beam (1'), and is fixedly connected to the second end of the second crossbeam (20) and the second longitudinal beam (1') respectively.

12. The vehicle body structure according to claim 8, characterized in that, Also includes: The rear seat anti-slip plate (30) is disposed between the first crossbeam (17) and the second crossbeam (20), and is detachably and fixedly connected to the first crossbeam (17), the second crossbeam (20), the first longitudinal beam (1) and the second longitudinal beam (1') respectively.

13. The vehicle body structure according to claim 1, characterized in that, Also includes: At least one mounting bracket (15) is disposed between the first crossbeam (17) and the second crossbeam (20), and the two ends of the mounting bracket (15) are fixedly connected to the first crossbeam (17) and the second crossbeam (20) respectively.

14. The vehicle body structure according to claim 2, characterized in that, Also includes: A sealing element (9) is disposed on the lower side of the mounting plate (4) for sealing the gap between the lower side of the mounting plate (4) and the battery pack (10).

15. The vehicle body structure according to any one of claims 8-14, characterized in that, Also includes: A housing (100) adapted to house electrical components; A first longitudinal beam (1) and a second longitudinal beam (1') are provided at intervals in the width direction of the vehicle body, and the box body (100) is located between the first longitudinal beam (1) and the second longitudinal beam (1').

16. The vehicle body structure according to claim 15, characterized in that, In the front-rear direction of the vehicle body, the second crossbeam (20) is located behind the box body (100), and the two ends of the second crossbeam (20) are respectively connected to the first longitudinal beam (1) and the second longitudinal beam (1').

17. The vehicle body structure according to claim 15, characterized in that, In the front-rear direction of the vehicle body, the mounting plate (4) is located in front of the box body (100), and the two ends of the mounting plate (4) are respectively connected to the first longitudinal beam (1) and the second longitudinal beam (1').

18. The vehicle body structure according to claim 15, characterized in that, In the vehicle height direction, the box (100) is located below the seat, and the projection of the box (100) in the vehicle height direction at least partially overlaps with the projection of the seat in the vehicle height direction.

19. The vehicle body structure according to claim 15, characterized in that, The box body (100) has a front flange (104) and a rear flange (106). The box body (100) overlaps with the mounting plate (4) through the front flange (104) and overlaps with the second crossbeam (20) through the rear flange (106). A third mounting bracket (105) is provided inside the box body (100). The third mounting bracket (105) is provided with a reinforcing rib (107). The third mounting bracket (105) overlaps with the front flange (104) and the rear flange (106) of the box body (100). The reinforcing rib (107) extends from the position where the third mounting bracket (105) overlaps with the front flange (104) to the position where the third mounting bracket (105) overlaps with the rear flange (106).

20. The vehicle body structure according to claim 19, characterized in that, There is a gap (18) between the housing (100) and at least a portion of the third mounting bracket (105).

21. The vehicle body structure according to claim 19, characterized in that, It also includes a seat mounting beam (8), the two ends of which are connected to the sill beam, and the projection of the seat mounting beam (8) in the vehicle height direction at least partially overlaps with the projection of the mounting plate (4) in the vehicle height direction.

22. The vehicle body structure according to claim 15, characterized in that, In the vehicle width direction, the first sill beam (3) is located on the side of the first longitudinal beam (1) away from the box body (100), and the second sill beam (3') is located on the side of the second longitudinal beam (1') away from the box body (100).

23. The vehicle body structure according to claim 19, characterized in that, The projections of the first sill beam (3) in the vehicle width direction, the second sill beam (3') in the vehicle width direction, and the box body (100) in the vehicle width direction at least partially overlap; and / or The projections of the first longitudinal beam (1) in the vehicle width direction, the second longitudinal beam (1') in the vehicle width direction, and the box (100) in the vehicle width direction at least partially overlap.

24. The vehicle body structure according to claims 8-23, characterized in that, The first threshold beam (3), the first longitudinal beam (1), and the floor (5A) form a second cavity (N), and / or the second threshold beam (3'), the second longitudinal beam (1'), and the floor (5A) form a second cavity (N).

25. The vehicle body structure according to claims 8-24, characterized in that, It also includes a C-pillar and a roof beam (27). The upper end of the C-pillar is connected to the roof beam (27), and the lower end of the C-pillar is connected to the first sill beam (3) and the second sill beam (3'). The second beam (20) of the vehicle body structure, the C-pillar, the first sill beam (3), the second sill beam (3'), and the roof beam (27) form a closed ring structure (H). The projection of the C-pillar in the vehicle width direction overlaps at least partially with the projection of the box (100) in the vehicle width direction.

26. A vehicle, characterized in that, include: The vehicle body structure according to any one of claims 1-25; A battery pack (10) is connected to a first crossbeam (17) and a second crossbeam (20) to form a closed cavity (Q).

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