Vehicle body unit and vehicle

Abstract

A vehicle body unit (100) and a vehicle, wherein the vehicle body unit (100) comprises a rear floor frame (3) including a side member structure (31) and a cross member structure (32), and a side sill (4) connected to the side member structure (31), the side member structure (31) includes a first side member body (3111) and a second side member body (3113) spaced apart and facing each other, the first side member body (3111) and / or the second side member body (3113) have extending members (313) extending toward each other, and the cross member structure (32) is connected between the first side member body (3111) and the second side member body (3113) and is connected to the corresponding extending members (313).

Description

Technical Field

[0001] [Cross - reference to Related Applications] This invention claims the priority of the Chinese patent application with the patent application number 202311069621.0, which was filed with the China National Intellectual Property Administration on August 22, 2023, and the full text thereof is incorporated herein by reference.

[0002] This invention relates to the technical field of vehicles, and in particular, to a vehicle body unit of a vehicle and a vehicle equipped with the same.

Background Art

[0003] In the related art, the rear floor of a vehicle is a part of the vehicle body. The side members and cross members of the rear floor skeleton of a conventional vehicle are directly overlapped and connected. The rear floor skeleton with such a structural form has poor structural strength and durability, cannot meet the requirements of the vehicle body's structural strength, reduces the safety of the vehicle, and also has poor NVH (Noise, Vibration, Harshness) performance of the vehicle body, which affects the driving experience of users.

Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the related art to some extent.

[0005] Therefore, this application aims to provide a vehicle body unit of a vehicle that is excellent in structural strength and durability and has good NVH performance.

[0006] Furthermore, this application provides a vehicle.

[0007] The vehicle body unit according to this application comprises a rear floor frame including a side member structure and a cross member structure, and a side sill connected to the side member structure, wherein the side member structure includes a plurality of side member bodies, the plurality of side member bodies include a first side member body and a second side member body installed opposite to each other at a distance, the first side member body and / or the second side member body have extending members extending toward each other, and the cross member structure is connected between the first side member body and the second side member body and is connected to the corresponding extending member.

[0008] According to the vehicle body unit of this application, the first side member body and / or the second side member body have extending members that extend toward each other, and the cross member structure is connected to the corresponding extending members, thereby improving the structural strength and durability of the rear floor frame, enabling the vehicle body unit to meet the structural strength requirements and improve vehicle safety, as well as providing good NVH performance for a vehicle body unit of this structural type, thereby improving the user's driving experience.

[0009] According to the vehicle of this application, the vehicle is equipped with the above-mentioned vehicle body unit.

[0010] Additional aspects and advantages of the present invention are partially shown in the following description, partially become apparent from the following description, or will be understood through the practice of the present invention. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of the rear floor frame according to an embodiment of the present application. [Figure 2] This is a schematic diagram of the rear floor frame according to an embodiment of the present application. [Figure 3] This is a schematic diagram of the rear floor frame according to an embodiment of the present application. [Figure 4] This is a schematic bottom view of a vehicle body unit according to an embodiment of this application. [Figure 5] This is an enlarged view of section A in Figure 4. [Figure 6] This is a schematic top view of a vehicle body unit according to an embodiment of the present application. [Figure 7] This is a schematic diagram of a vehicle body unit according to an embodiment of the present application. [Figure 8] This is an enlarged view of section B in Figure 7. [Figure 9] This is a schematic diagram of the vehicle body unit according to an embodiment of this application, viewed from a different angle. [Figure 10] This is an enlarged view of section C in Figure 9. [Figure 11] This is a schematic diagram of a vehicle body unit according to an embodiment of the present application. [Modes for carrying out the invention]

[0012] The following describes embodiments of the present invention in detail, which are shown in the drawings, where the same or similar reference numerals from beginning to end indicate the same or similar elements, or elements having the same or similar function. The embodiments described below with reference to the drawings are illustrative and intended to illustrate the present invention, and should not be understood as limiting the invention.

[0013] The vehicle body unit 100 according to the embodiment of this application will be described below with reference to Figures 1 to 11.

[0014] As shown in Figures 1 to 11, the vehicle body unit 100 according to the embodiment of this application comprises a rear floor frame 3 and a side sill 4.

[0015] Here, the rear floor frame 3 includes a side member structure 31 and a cross member structure 32, and the side member structure 31 may include a plurality of side member bodies 311, and the plurality of side member bodies 311 may include a first side member body 3111 and a second side member body 3113, and the first side member body 3111 and the second side member body 3113 may be installed facing each other and spaced apart along the width direction of the vehicle (i.e., the Y direction shown in Figure 1). Both the first side member body 3111 and the second side member body 3113 may extend along the longitudinal direction of the vehicle (i.e., the X direction shown in Figure 1).

[0016] The first side member body 3111 and / or the second side member body 3113 have extending members 313 extending toward each other. In some optional embodiments of the present application, the first side member body 3111 may have an extending member 313, and the extending member 313 may extend toward the second side member body 3113, specifically, the extending member 313 of the first side member body 3111 may extend toward the second side member body 3113 along the width direction of the vehicle (i.e., the Y direction as shown in Figure 1). In some optional embodiments of the present application, the second side member body 3113 may have an extending member 313, and the extending member 313 may extend toward the first side member body 3111, specifically, the extending member 313 of the second side member body 3113 may extend toward the first side member body 3111 along the width direction of the vehicle (i.e., the Y direction as shown in Figure 1). In some optional embodiments of this application, the first side member body 3111 and the second side member body 3113 may both have an extending member 313, the extending member 313 of the first side member body 3111 may extend toward the second side member body 3113 along the width direction of the vehicle, and the extending member 313 of the second side member body 3113 may extend toward the first side member body 3111 along the width direction of the vehicle. As can be understood, when the first side member body 3111 and the second side member body 3113 both have an extending member 313, the extending member 313 of the first side member body 3111 and the extending member 313 of the second side member body 3113 are provided correspondingly along the width direction of the vehicle.

[0017] A cross member structure 32 is connected between the first side member body 3111 and the second side member body 3113, and the cross member structure 32 is connected to the corresponding extending member 313. In an embodiment in which the first side member body 3111 has an extending member 313, one end of the cross member structure 32 may be connected to the extending member 313 of the first side member body 3111, and the other end of the cross member structure 32 may be connected to the second side member body 3113. In an embodiment in which the second side member body 3113 has an extending member 313, one end of the cross member structure 32 may be connected to the extending member 313 of the second side member body 3113, and the other end of the cross member structure 32 may be connected to the first side member body 3111. In an embodiment in which both the first side member body 3111 and the second side member body 3113 have an extending member 313, one end of the cross member structure 32 may be connected to the extending member 313 of the first side member body 3111, and the other end of the cross member structure 32 may be connected to the extending member 313 of the second side member body 3113. By configuring the first side member body 3111 and / or the second side member body 3113 to have an extending member 313, and by connecting the cross member structure 32 to the corresponding extending member 313, the structural strength of the rear floor frame 3 can be improved, the durability of the rear floor frame 3 can be improved, the vehicle body unit 100 can meet the requirements for structural strength of the vehicle body, and a vehicle body unit 100 of this structural type has low noise during use, low vibration frequency and low vibration amplitude, which is advantageous for improving the NVH performance of the vehicle.

[0018] The side sill 4 is connected to the side member structure 31. As some selectable embodiments of the present application, there may be a plurality of side sills 4. The plurality of side sills 4 may include a first side sill 47 and a second side sill. Each side sill 4 may include a side sill body and a side sill rear 480. Specifically, the first side sill 47 may include a first side sill body and a first side sill rear 472. The second side sill may include a second side sill body and a second side sill rear. The side sill rear 480 may be connected between the corresponding side sill body and the corresponding side member body 311 so as to connect the side sill 4 and the side member structure 31.

[0019] The first side sill rear 472 may be connected between the first side sill body and the first side member body 3111. Specifically, one end of the first side sill rear 472 may be connected to the end of the first side sill body close to the first side member body 3111, and the other end of the first side sill rear 472 may be connected to the end of the first side member body 3111 close to the first side sill body. Specifically, one end of the second side sill rear may be connected to the end of the second side sill body close to the second side member body 3113, and the other end of the second side sill rear may be connected to the end of the second side member body 3113 close to the second side sill body.

[0020] Thereby, the first side member body 3111 and / or the second side member body 3113 have an extending member 313 extending towards each other, and the cross member structure 32 is connected to the corresponding extending member 313, so that the structural strength and durability of the rear floor frame 3 can be improved, the vehicle body unit 100 can meet the requirements of structural strength, the safety of the vehicle can be improved, and the NVH performance of the vehicle body unit 100 with such a structural form is good, and the driving experience of the user can be improved.

[0021] In some embodiments of the present application, as shown in FIGS. 1 and 2, both the first side member body 3111 and the second side member body 3113 may have an extending member 313, and the extending member 313 of the first side member body 3111 and the extending member 313 of the second side member body 3113 may be arranged to face each other and be spaced apart. Specifically, the extending member 313 of the first side member body 3111 may extend toward the second side member body 3113 along the width direction of the vehicle, the extending member 313 of the second side member body 3113 may extend toward the first side member body 3111 along the width direction of the vehicle, and the extending member 313 of the first side member body 3111 and the extending member 313 of the second side member body 3113 face each other and are spaced apart along the width direction of the vehicle.

[0022] Both ends of the cross member structure 32 are respectively connected to the corresponding extending members 313. That is, one end of the cross member structure 32 may be connected to the extending member 313 of the first side member body 3111, and the other end of th e cross member structure 32 may be connected to the extending member 313 of the second side member body 3113. Installed in this way, the structural strength of the rear floor frame 3 can be improved, the durability of the rear floor frame 3 can also be improved, the vehicle body unit 100 can meet the requirements of the structural strength of the vehicle body, and it is advantageous to reduce the noise and vibration during the use of the vehicle body unit 100.

[0023] In some embodiments of the present application, as shown in FIGS. 1 and 2, both the first side member body 3111 and the second side member body 3113 may have a plurality of extending members 313, and the plurality of extending members 313 of the first side member body 3111 and the plurality of extending members 313 of the second side member body 3113 may correspond to each other one by one to form a plurality of extending member groups 314.

[0024] Here, the first side member body 3111 and the second side member body 3113 may each have two, three, or four extending members 313, but are not limited to these. What needs to be explained is that the number of extending members 313 in the first side member body 3111 and the number of extending members 313 in the second side member body 3113 are the same. For example, if the first side member body 3111 has two extending members 313, then the second side member body 3113 also has two extending members 313, and the two extending members of the first side member body 3111 The two extending members 313 of the first side member body 3113 and the second side member body 3113 are provided in a one-to-one correspondence. That is, one extending member 313 of the first side member body 3111 and one extending member 313 of the second side member body 3113 face each other and are spaced apart along the width direction of the vehicle to form one group of extending members 314, and the other extending member 313 of the first side member body 3111 and the other extending member 313 of the second side member body 3113 face each other and are spaced apart along the width direction of the vehicle to form one group of extending members 314.

[0025] A cross member structure 32 may be connected between any two extending members 313 of each extending member group 314. For example, if the first side member body 3111 and the second side member body 3113 each have two extending members 313, the cross member structure 32 may be connected between one extending member 313 of the first side member body 3111 and one extending member 313 of the second side member body 3113, or between the other extending member 313 of the first side member body 3111 and the other extending member 313 of the second side member body 3113. When installed in this manner, the structural strength and durability of the rear floor frame 3 can be further improved, and the NVH performance of the vehicle body unit 100 can be further improved.

[0026] In some embodiments of this application, as shown in Figures 1 and 2, the multiple extending member groups 314 may be installed sequentially spaced apart along the first direction of the rear floor frame 3 (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1), that is, there is a spacing distance between each of the multiple extending member groups 314 along the second direction. This arrangement allows for a rational arrangement of the multiple extending member groups 314, and enables uniform structural strength in each part of the rear floor frame 3. Furthermore, it should be explained that if the multiple extending member groups 314 are too close together, it becomes difficult to produce the rear floor frame 3 (related to the production process), and installing the multiple extending member groups sequentially spaced apart along the second direction is advantageous in reducing the difficulty of producing the rear floor frame 3.

[0027] In some embodiments of this application, as shown in Figures 1 and 2, the plurality of extending member groups 314 may include a first extending member group 3141 and a second extending member group 3142, and the first extending member group 3141 and the second extending member group 3142 may be spaced apart along a first direction, and the cross member structure 32 may include a first sub-cross member 321 and a second sub-cross member 322. Here, the first sub-cross member 321 may be connected between two extending members 313 of the first extending member group 3141, and the second sub-cross member 322 may be connected between two extending members 313 of the second extending member group 3142.

[0028] Specifically, the first extending member group 3141 may include two extending members 313, one of which is an extending member 313 of the first side member body 3111, and the other extending member 313 is an extending member 313 of the second side member body 3113, and the first subcross member 321 may be connected between the two extending members 313 of the first extending member group 3141. The second extending member group 3142 may include two extending members 313, one of which is an extending member 313 of the first side member body 3111, and the other extending member 313 is an extending member 313 of the second side member body 3113, and the second subcross member 322 may be connected between the two extending members 313 of the second extending member group 3142. When installed in this manner, the rear floor frame 3 can have two extended member groups 314, which improves the structural strength of the rear floor frame 3 and simplifies the production of the rear floor frame 3.

[0029] In some embodiments of this application, the vehicle body unit 100 may further include a battery pack 5, as shown in Figure 11.

[0030] Along the second direction of the rear floor frame 3 (i.e., the vehicle height direction), the orthographic projection of the cross member structure 32 and the orthographic projection of the battery pack 5 have an overlapping region. In other words, if a plane is set perpendicular to the vehicle height direction, that is, if the normal of the plane is parallel to the vehicle height direction, then the orthographic projection of the cross member structure 32 on that plane and the orthographic projection of the battery pack 5 on that plane have an overlapping region. When installed in this manner, if the vehicle is subjected to a pressing force in the Z direction, the cross member structure 32 can bear the pressing force and transmit it to the side member structure 31, thereby avoiding the battery pack 5 from being subjected to a pressing force in the Z direction, or reducing the pressing force in the Z direction that the battery pack 5 receives, which is advantageous in improving vehicle safety.

[0031] In some embodiments of this application, as shown in Figures 1 to 3, the distance between the first sub-cross member 321 and the front end of the side member structure 31 along the first direction of the rear floor frame 3 (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1) may be smaller than the distance between the first sub-cross member 321 and the rear end of the side member structure 31.

[0032] In some optional embodiments of this application, the first sub-cross member 321 may extend along the width direction of the vehicle, and both ends of the first sub-cross member 321 may be connected to the extending member 313. Along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1), the distance between the first sub-cross member 321 and the front end of the side member structure 31 may be smaller than the distance between the first sub-cross member 321 and the rear end of the side member structure 31; in other words, the first sub-cross member 321 may be located forward of the center of the side member structure 31. This configuration allows for a rationalized installation position of the first sub-cross member 321 and improves the structural strength of the front section of the rear floor frame 3.

[0033] Along the second direction (i.e., the vehicle height direction), the orthographic projection of the first sub-cross member 321 and the orthographic projection of the battery pack 5 may have an overlapping region, where the second direction is perpendicular to the first direction. When installed in this manner, if the vehicle is subjected to a pressing force in the Z direction, the first sub-cross member 321 can bear the pressing force and transmit it to the side member structure 31. This prevents the battery pack 5 from being subjected to a pressing force in the Z direction, or reduces the pressing force in the Z direction that the battery pack 5 receives, which is advantageous for improving vehicle safety.

[0034] In some embodiments of this application, as shown in Figure 11, the width of the overlapping region may be M1 and the width of the first sub-cross member 321 may be M2 along a first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 11), and M1 and M2 satisfy the relationship 0.25M2 ≤ M1 ≤ 0.45M2. That is, M1 may be any value between 0.25M2 and 0.45M2, for example, M1 may be 0.25M2, 0.35M2, 0.45M2, etc., but is not limited to these. When installed in this manner, the ratio relationship between the width M1 of the overlapping region in the first direction between the orthographic projection of the first sub-cross member 321 and the orthographic projection of the battery pack 5 and the width M2 of the first sub-cross member 321 can be made rational, thereby providing reliable protection to the battery pack 5 in the Z direction.

[0035] In some embodiments of this application, as shown in Figure 11, the length of the battery pack 5 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 11) may be M3, and M3 and M2 may satisfy the relationship 0.045M3 ≤ M2 ≤ 0.115M3. That is, M2 may be any value between 0.045M3 and 0.115M3, for example, M2 may be 0.045M3, 0.076M3, 0.115M3, etc., but is not limited to these. When installed in this manner, the ratio relationship between the width M2 of the first sub-cross member 321 and the length M3 of the battery pack 5 can be made reasonable, the first sub-cross member 321 can be given sufficient width, the first sub-cross member 321 can be given sufficient impact resistance capability, and is advantageous in providing reliable protection to the battery pack 5.

[0036] In some embodiments of this application, as shown in Figures 1 to 3, the distance between the second sub-cross member 322 and the front end of the side member structure 31 may be greater than the distance between the second sub-cross member 322 and the rear end of the side member structure 31.

[0037] In some optional embodiments of this application, the second sub-cross member 322 may extend along the width direction of the vehicle, and both ends of the second sub-cross member 322 may be connected to the extending member 313. Along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1), the distance between the second sub-cross member 322 and the front end of the side member structure 31 may be greater than the distance between the second sub-cross member 322 and the rear end of the side member structure 31; in other words, the second sub-cross member 322 may be located behind the center of the side member structure 31. This configuration allows for a rational placement of the second sub-cross member 322 and improves the structural strength of the rear section of the rear floor frame 3.

[0038] To make it easier to understand, the first sub-cross member 321 is positioned forward of the center of the side member structure 31, which means that the first extending member group 3141 is also positioned forward of the center of the side member structure 31. In other words, the distance between the first extending member group 3141 and the front end of the side member structure 31 is smaller than the distance between the first extending member group 3141 and the rear end of the side member structure 31. This arrangement allows for a rational placement of the first sub-cross member 321 and the first extending member group 3141, thereby improving the structural strength of the front section of the rear floor frame 3.

[0039] To make it easier to understand, the second sub-cross member 322 is located behind the center of the side member structure 31, which means that the second extending member group 3142 is also located behind the center of the side member structure 31. In other words, the distance between the second extending member group 3142 and the front end of the side member structure 31 is greater than the distance between the second extending member group 3142 and the rear end of the side member structure 31. This arrangement allows for a rational placement of the second sub-cross member 322 and the second extending member group 3142, thereby improving the structural strength of the rear section of the rear floor frame 3.

[0040] In some embodiments of this application, as shown in Figure 11, the length of the first sub-cross member 321 may be M5 and the width of the battery pack 5 may be M6 along the third direction of the rear floor frame 3 (i.e., the vehicle width direction, i.e., the Y direction shown in Figure 11), and M5 and M6 may satisfy the relationship 0.25M6 ≤ M5 ≤ 0.5M6. That is, M5 may be any value between 0.25M6 and 0.5M6, for example, M5 may be 0.25M6, 0.334M6, 0.40M6, 0.5M6, etc., but is not limited to these. When installed in this manner, the ratio relationship between the length M5 of the first sub-cross member 321 and the width M6 of the battery pack 5 can be made reasonable, the first sub-cross member 321 can be given sufficient length, the first sub-cross member 321 can be given sufficient impact resistance capability, and it is advantageous to provide reliable protection to the battery pack 5.

[0041] Here, the third direction is perpendicular to the first and second directions.

[0042] In some embodiments of this application, as shown in Figures 3 and 11, the length of the second sub-cross member 322 may be M7 and the width of the battery pack 5 may be M6 along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 3), and M7 and M6 satisfy the relationship 0.25M6 ≤ M7 ≤ 0.5M6. That is, M7 may be any value between 0.25M6 and 0.5M6, for example, M7 may be 0.25M6, 0.334M6, 0.40M6, 0.5M6, etc., but is not limited to these. When the vehicle is subjected to a rear collision, the second sub-cross member 322 is impacted before the first sub-cross member 321, and when installed in this manner, the ratio relationship between the length M7 of the second sub-cross member 322 and the width M6 of the battery pack 5 can be made reasonable, and the second sub-cross member 322 can be given sufficient impact resistance capability.

[0043] Furthermore, by limiting the ratio relationship between the length M5 of the first sub-cross member 321 and the width M6 of the battery pack 5, and by limiting the ratio relationship between the length M7 of the second sub-cross member 322 and the width M6 of the battery pack 5, the relationship between the dimensions of the entire cross member structure 32 and the dimensions of the battery pack 5 can be made rational, which is advantageous in providing reliable protection to the battery pack 5.

[0044] In some optional embodiments of this application, the rear floor frame 3 may be manufactured using an integrated cold press forming method. Such a method can improve material utilization and reduce production costs, and can also reduce the weight of the rear floor frame 3, which is advantageous in meeting the lightweight design requirements of the vehicle. Furthermore, employing an integrated cold press forming method is advantageous in precisely controlling the dimensions of the rear floor frame 3, ensuring the stability of the vehicle's dimensions and quality. Additionally, employing an integrated cold press forming method can reduce the number of parts, lower the difficulty of matching equipment and jigs, reduce production processes, and improve production efficiency.

[0045] In some selectable embodiments of this application, in an integral cold press forming method, laser welding may be performed on the sheet material first, followed by laser cutting, and finally integral forming. In some selectable embodiments of this application, the first subcross member 321 and the extending member 313, and the second subcross member 322 and the extending member 313 may all be integrally connected by laser welding. This configuration reduces the overlapping connection flanges of the first subcross member 321 and the second subcross member 322, which is advantageous for weight reduction and cost reduction.

[0046] As one of several selectable embodiments of this application, as shown in Figure 1, the connection points between the extending member 313 and the first side member body 3111, and the connection points between the extending member 313 and the second side member body 3113 may be transitioned by an arc, thereby reducing the difficulty of press molding.

[0047] In some embodiments of this application, as shown in Figures 4 to 10, the vehicle body unit 100 may further comprise a battery pack 5. The battery pack 5 can provide power to the vehicle's electric motor, and the battery pack 5 has a first connecting member 51, which is connected to the end of the side sill 4 near the side member structure 31, which may be the side sill rear 480. In some selectable embodiments of this application, there may be multiple first connecting members 51, and the first connecting members 51 may be connected to the corresponding side sill rear 480. In some selectable embodiments of this application, the first connecting members 51 and the corresponding side sill rear 480 may be connected by screwing, welding, etc.

[0048] It is necessary to explain that the vehicle body has hardpoints for the rear suspension and hardpoints for the lifting device, where the hardpoints for the rear suspension are used to connect to the vehicle's rear suspension, and the hardpoints for the lifting device are used to work with the lifting device, which may be a jig for transporting and moving the vehicle body during the production process. When connecting the battery pack 5 to the vehicle body, it is necessary to avoid the hardpoints for the rear suspension and the lifting device in order to prevent the battery pack 5 from obstructing these hardpoints, which makes the placement of the mounting points for the battery pack 5 difficult and increases the difficulty of the vehicle design.

[0049] In this application, by connecting the first connecting member 51 of the battery pack 5 to the end of the side sill 4 that is close to the side member structure 31, the end of the side sill 4 that is close to the side member structure 31 can provide a mounting point for the battery pack 5, thereby reducing the difficulty in arranging the mounting point for the battery pack 5.

[0050] By connecting the first connection member 51 to the end of the side sill 4 close to the side member structure 31, an attachment point for the battery pack 5 can be provided by the end of the side sill 4 close to the side member structure 31. When arranging the attachment point of the battery pack 5, it is possible to easily avoid the hard points of the rear suspension of the vehicle body and the hard points of the lifting tool, reduce the difficulty of arranging the attachment point of the battery pack 5, and further reduce the difficulty of vehicle design, which is advantageous.

[0051] In some embodiments of the present application, as shown in FIG. 6, along the third direction of the vehicle body unit 100 (i.e., the width direction of the vehicle, i.e., the Y direction shown in FIG. 6), the separation distance between the side of the side sill 4 away from the battery pack 5 and the battery pack 5 may be L1, or it may be understood that the separation distance between the side of the end of the side sill 4 close to the side member structure 31 away from the battery pack 5 and the battery pack 5 is L1. Further, it may be understood that the separation distance between the side of the side sill rear 480 away from the battery pack 5 and the battery pack 5 is L1. Along the third direction of the vehicle body unit 100 (i.e., the width direction of the vehicle, i.e., the Y direction shown in FIG. 6), the separation distance between the side of the side member structure 31 away from the battery pack 5 and the battery pack 5 may be L2, or it may be understood that the separation distance between the side of the side member body 311 away from the battery pack 5 and the battery pack 5 is L2.

[0052] L1 and L2 may satisfy the relational expression L2 < L1. That is, the separation distance between the side of the side sill 4 away from the battery pack 5 and the battery pack 5 is greater than the separation distance between the side of the side member structure 31 away from the battery pack 5 and the battery pack 5. Installed in this way, the connection between the first connection member 51 and the end of the side sill 4 close to the side member structure 31 can be facilitated, the assembly difficulty of the battery pack 5 can be reduced, the side sill 4 can provide more attachment points for the battery pack 5, and the difficulty of arranging the attachment points of the battery pack 5 can be reduced.

[0053] In some embodiments of this application, there may be a separation distance between the battery pack 5 and the side sill 4 along a third direction (i.e., the width direction of the vehicle, i.e., the Y direction as shown in Figure 6), and as can be understood, the side sill 4 may comprise a plurality of side sill bodies, the plurality of side sill bodies may include a first side sill body and a second side sill body, and the battery pack 5 is located between the first side sill body and the second side sill body.

[0054] Specifically, as shown in Figure 6, the battery pack 5 may include a first sub-body 53 and a second sub-body 54 connected to each other, with both the first sub-body 53 and the second sub-body 54 positioned between the first side sill body and the second side sill body. This configuration allows for a rational relative position between the battery pack 5 and the side sill 4, reducing the probability of interference between the battery pack 5 and the side sill 4 when installing the battery pack 5. Furthermore, in the event of a side collision, the gap between the battery pack 5 and the side sill 4 can absorb part of the impact, reducing the impact received by the battery pack 5 and thus contributing to improved vehicle safety.

[0055] In some embodiments of this application, as shown in Figure 5, the first connecting member 51 may have a first mounting portion 511, the first mounting portion 511 being mounted in correspondence with the side sill 4, and the distance between the first mounting portion 511 and the side member structure 31 along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 5) may be L3, where L3 satisfies the relation 30 mm ≤ L3 ≤ 80 mm.

[0056] Specifically, the distance between the first mounting portion 511 and the corresponding side member body 311 may be L3. In some selectable embodiments of this application, the first mounting portion 511 may be configured as a first mounting hole 5111, and the first mounting hole 5111 and the side sill 4 may be attached by bolts. The distance between the first mounting portion 511 and the corresponding side member body 311 may be L3, and L3 may be any value between 30 mm and 80 mm. For example, L3 may be 30 mm, 50 mm, 80 mm, etc., but is not limited to these. It should be explained that when the first mounting portion 511 is configured as a first mounting hole 5111, L3 may be understood as the distance between the central axis of the first mounting hole 5111 and the corresponding side member body 311. This configuration allows for a reasonable distance between the first mounting portion 511 and the side member structure 31, which is advantageous for improving the overall strength of the vehicle body unit 100.

[0057] In some selectable embodiments of this application, the smaller the distance between the first mounting portion 511 and the side member structure 31, the higher the overall strength of the vehicle body unit 100.

[0058] In some embodiments of this application, as shown in Figures 4 and 5, there may be multiple side sills 4, and the multiple side sills 4 may be spaced apart along a third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 4). In some selectable embodiments of this application, the multiple side sills 4 may include a first side sill 47 and a second side sill, and the first side sill 47 and the second side sill may be spaced apart along the third direction, and each side sill 4 may comprise a side sill body and a side sill rear 480. Specifically, the first side sill 47 may comprise a first side sill body and a first side sill rear 472, the second side sill may comprise a second side sill body and a second side sill rear, and the side sill rear 480 may be connected between a corresponding side sill body and a corresponding side member body 311 to connect the side sill 4 and the side member structure 31.

[0059] The number of first connecting members 51 may be multiple, and the multiple first connecting members 51 may be provided on opposing sides of the battery pack 5 along a first direction, and each of the multiple first connecting members 51 may be connected to a corresponding side sill 4. In some selectable embodiments of this application, the number of first connecting members 51 may be two, and the two first connecting members 51 may be provided on opposing sides of the battery pack 5 along a third direction, and one first connecting member 51 may be connected to the first side sill rear 472 of the first side sill 47, and the other first connecting member 51 may be connected to the second side sill rear of the second side sill. With this arrangement, both sides of the battery pack 5 have connection points with the side sill 4, which improves the robustness of the connection between the battery pack 5 and the side sill 4.

[0060] In some embodiments of this application, as shown in Figure 5, the battery pack 5 may further have a second connecting member 52, which may be connected to the corresponding extending member 313 by screwing or welding, but is not limited thereto. In some selectable embodiments of this application, both the first side member body 3111 and the second side member body 3113 may have an extending member 313, and there may be two second connecting members 52, one of which may be connected to the extending member 313 of the first side member body 3111, and the other second connecting member 52 may be connected to the extending member 313 of the second side member body 3113. This configuration allows the battery pack 5 to be connected to the side member structure 31 of the rear floor frame 3, which is advantageous in improving the robustness of the battery pack 5's mounting.

[0061] In some embodiments of this application, as shown in Figures 8 and 10, the extending member 313 may comprise an extending member body 3131 and a mounting bracket 3132 connected to each other, that is, the mounting bracket 3132 is provided on the extending member body 3131, and in some selectable embodiments of this application, the extending member body 3131 may define an open cavity, and at least a portion of the structure of the mounting bracket 3132 may be provided within the cavity, and the second connecting member 52 may be connected to the mounting bracket 3132, and in some selectable embodiments of this application, along the height direction of the vehicle body unit 100, a portion of the structure of the extending member body 3131 may be located between the mounting bracket 3132 and the second connecting member 52.

[0062] Along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 4), both the extending member body 3131 and the mounting bracket 3132 may be located inside the corresponding side member body 311, and both the extending member body 3131 and the mounting bracket 3132 may be connected to the corresponding side member body 311. In some selectable embodiments of this application, the extending member body 3131 and the corresponding side member body 311 may be integrally molded parts, and the mounting bracket 3132 and the corresponding side member body 311 may be connected by welding or screwing, but are not limited to these. By providing the mounting bracket 3132, the structural strength of the extending member 313 can be improved, connecting members such as nuts can be easily placed, and the difficulty of connecting the second connecting member 52 and the extending member 313 can be reduced.

[0063] In some embodiments of this application, as shown in Figures 8 and 10, the side member body 311 may have a limiting flange 3112, and the limiting flange 3112 may be located on the side of the side member body 311 closer to the extending member 313.

[0064] The side member structure 31 may further include a plurality of side member reinforcing plates 315, each of which may be provided on a corresponding side member body 311. Specifically, the side member structure 31 may include two side member reinforcing plates 315, one of which may be provided on a first side member body 3111, and the other side member reinforcing plate 315 may be provided on a second side member body 3113. Along a third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 4), the side member reinforcing plates 315 may be located outside the limiting flange 3112 of the corresponding side member body 311, and the side member reinforcing plates 315 may be connected to the limiting flange 3112 of the corresponding side member body 311. By providing the side member reinforcing plates 315, the structural strength of the side member structure 31 can be improved.

[0065] Furthermore, the side member reinforcing plate 315 is located outside the limiting flange 3112 of the corresponding side member body 311, and the mounting bracket 3132 is located inside the limiting flange 3112 of the corresponding side member body 311. Both the side member reinforcing plate 315 and the mounting bracket 3132 may have flanges, and the flanges of the side member reinforcing plate 315 and the mounting bracket 3132 abut against both sides of the limiting flange 3112. When installed in this manner, the mounting bracket 3132 and the side member reinforcing plate 315 can support the side member body 311 in the Y direction, thereby improving the structural strength of the side member structure 31.

[0066] In some embodiments of this application, as shown in Figure 5, the second connecting member 52 may have a second mounting portion 521, the second mounting portion 521 being mounted in correspondence with the extending member 313, and the distance between the second mounting portion 521 and the battery pack 5 may be L4 along the first direction of the vehicle body unit 100 (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 5), where L4 satisfies the relation 1 mm ≤ L4 ≤ 60 mm, and where the second direction is perpendicular to the first direction.

[0067] In some optional embodiments of this application, the second mounting portion 521 may be configured as a second mounting hole 5211, and the second mounting hole 5211 may be attached to the corresponding extending member 313 by bolts, and the distance between the second mounting portion 521 and the battery pack 5 may be L4, which may be any value between 1 mm and 60 mm, for example, L4 may be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc., but is not limited to these. In some specific embodiments of this application, L4 may be 50 mm. When the second mounting portion 521 is configured as a second mounting hole 5211, L4 may be understood as the distance between the central axis of the second mounting hole 5211 and the battery pack 5. This configuration allows for a reasonable distance between the second mounting portion 521 and the battery pack 5, which is advantageous for improving the overall strength of the vehicle body unit 100.

[0068] In some optional embodiments of this application, the extending member body 3131 may have relief holes for avoiding bolts, such that the second mounting hole 5211 connects to the mounting bracket 3132 of the corresponding extending member 313.

[0069] It is important to explain that in this application, the first, second, and third directions are orthogonal to each other.

[0070] In some embodiments of this application, as shown in Figures 4 and 6, the battery pack 5 may comprise a first sub-body 53 and a second sub-body 54 connected to each other, wherein the width of the second sub-body 54 is smaller than the width of the first sub-body 53 along a third direction (i.e., the width direction of the vehicle, i.e., the Y direction as shown in Figure 4), the second connecting member 52 may be located at one end of the second sub-body 54 away from the first sub-body 53, and the first connecting member 51 may be located at the side edge of the first sub-body 53.

[0071] In some selectable embodiments of this application, the number of first connecting members 51 and the number of second connecting members 52 may both be two, the two first connecting members 51 may be spaced apart along a first direction, and the two second connecting members 52 may be spaced apart along a third direction, and the width of the second sub-body 54 may be smaller than the width of the first sub-body 53, and the second connecting members 52 may be located at one end of the second sub-body 54 away from the first sub-body 53, and the first connecting members 51 may be located at the side edge of the first sub-body 53, so that the two second connecting members 52 and the two first connecting members 51 are located at the four corners of a trapezoid, and such an installation is advantageous in improving the durability of the torsional rigidity and dynamic rigidity of the vehicle body unit 100. Furthermore, such an installation can make the mounting of the battery pack 5 more secure, reduce vibration of the battery pack 5 during vehicle operation, and improve the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0072] In some embodiments of this application, as shown in Figure 5, the distance between the second mounting portion 521 and the side edge of the second sub-body 54 along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 4) may be L5, and L5 may satisfy the relation 50 mm ≤ L5 ≤ 80 mm. In other words, L5 may be any value between 50 mm and 80 mm, for example, L5 may be 50 mm, 60 mm, 70 mm, 80 mm, etc., but is not limited to these. If the second mounting portion 521 is configured as a second mounting hole 5211, L5 may be understood as the distance between the central axis of the second mounting hole 5211 and the side edge of the second sub-body 54. This configuration allows for a rational installation position of the second mounting portion 521, which is advantageous in ensuring the robustness of the battery pack 5 mounting.

[0073] In some embodiments of this application, as shown in Figures 1 and 2, the extending dimension of the extending member 313 of the first extending member group 3141 may be K1 along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 1), specifically, the extending dimension of each extending member 313 of the first extending member group 3141 may all be K1, and the width of the first subcross member 321 may be K2 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1), and K1 and K2 may satisfy the relation 3K2 ≤ K1 ≤ 13K2, that is, K1 may be any value between 3 times K2 and 13 times K2, for example, K1 may be 3K2, 8K2, 13K2, etc., but is not limited to these. By installing it in this manner, the ratio relationship between the extended dimension of the extended member 313 of the first extended member group 3141 and the width of the first sub-cross member 321 can be made rational, which is advantageous in securing the structural strength of the front part of the rear floor frame 3, and the structural strength of each part of the rear floor frame 3 can be made uniform, thus avoiding the occurrence of clearly insufficient load-bearing areas (i.e., positions that are prone to fracture).

[0074] In some embodiments of this application, as shown in Figures 1 and 2, the extending dimension of the extending member 313 of the second extending member group 3142 may be K3 along the third direction (i.e., the width direction of the vehicle, i.e., the Y direction shown in Figure 1), specifically, the extending dimension of each extending member 313 of the second extending member group 3142 may all be K3, and the width of the second sub-cross member 322 may be K4 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 1), and K3 and K4 may satisfy the relation 3K4 ≤ K3 ≤ 13K4. That is, K3 may be any value between 3 times K4 and 13 times K4, for example, K3 may be 3K4, 8K4, 13K4, etc., but is not limited to these. By installing it in this manner, the ratio relationship between the extended dimension of the extended member 313 of the second extended member group 3142 and the width of the second sub-cross member 322 can be made rational, which is advantageous in securing the structural strength of the rear floor frame 3, and the structural strength of each part of the rear floor frame 3 can be made uniform, thus avoiding the occurrence of clearly insufficient load-bearing areas (i.e., positions that are prone to fracture).

[0075] It is important to explain that by making the distance between the first sub-cross member 321 and the front end of the side member structure 31 smaller than the distance between the first sub-cross member 321 and the rear end of the side member structure 31, and by making the distance between the second sub-cross member 322 and the front end of the side member structure 31 larger than the distance between the second sub-cross member 322 and the rear end of the side member structure 31, the first extending member group 3141 and the second extending member group 3142 can be separated, which is advantageous in reducing the difficulties in producing the rear floor frame 3.

[0076] In some embodiments of this application, as shown in Figures 1 and 2, along the third direction, the length of the first sub-cross member 321 may be K5, and the length of the second sub-cross member 322 may be K6, and K5 and K6 may satisfy the relationship K6 ≤ K5, that is, the length of the first sub-cross member 321 may be greater than the length of the second sub-cross member 322, or the length of the first sub-cross member 321 may be equal to the length of the second sub-cross member 322. When installed in this manner, the length relationship between the first sub-cross member 321 and the second sub-cross member 322 can be made rational, which is advantageous in improving the structural strength and durability of the rear floor frame 3, allowing the rear floor frame 3 to meet the structural strength requirements of the vehicle body and improving the safety of the vehicle.

[0077] In some embodiments of this application, as shown in Figures 1 to 3, the rear floor frame 3 may further include a third cross member 33, the third cross member 33 may be connected between the first side member body 3111 and the second side member body 3113, that is, one end of the third cross member 33 may be connected to the first side member body 3111, the other end of the third cross member 33 may be connected to the second side member body 3113, and the third cross member 33 may be located between the first sub-cross member 321 and the second sub-cross member 322. To make it clear, the third cross member 33 is not connected to the extending member 313 of the first side member body 3111 and the extending member 313 of the second side member body 3113. When installed in this manner, the first side member body 3111 and the second side member body 3113 do not need to have extending members 313 to which they are connected to the third cross member 33. This reduces the number of extending member groups 314, avoids the situation where multiple extending member groups 314 are too close together, which is advantageous in reducing the difficulties in producing the rear floor frame 3. Furthermore, by providing the third cross member 33 between the first sub-cross member 321 and the second sub-cross member 322, it is advantageous in improving the structural strength of the middle section of the rear floor frame 3.

[0078] In some optional embodiments of this application, the third cross member 33 and the first side member body 3111, and the third cross member 33 and the second side member body 3113 may both be welded by overlapping connecting flanges.

[0079] As shown in Figure 3, the distance between the third cross member 33 and the first sub-cross member 321 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 3) may be M8, and the distance between the third cross member 33 and the second sub-cross member 322 may be M9, and M8 and M9 may satisfy the relationship 0.854M9 ≤ M8 ≤ 1.154M9. That is, M8 may be any value between 0.854M9 and 1.154M9, for example, M8 may be 0.854M9, 0.954M9, 1.023M9, 1.154M9, etc., but is not limited to these. When installed in this manner, the ratio relationship between the distance M8 between the third cross member 33 and the first sub-cross member 321 and the distance M9 between the third cross member 33 and the second sub-cross member 322 can be made rational, which is advantageous for improving the structural strength and durability of the rear floor frame 3.

[0080] In some embodiments of this application, as shown in Figure 11, the distance between the second sub-cross member 322 and the battery pack 5 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 11) may be M10, where M10 satisfies the relation 600mm ≤ M10 ≤ 750mm. That is, M10 may be any value between 600mm and 750mm, for example, M10 may be 600mm, 661mm, 670mm, 750mm, etc., but is not limited to these. This configuration allows for a reasonable distance between the second sub-cross member 322 and the battery pack 5, which is advantageous in providing reliable protection to the battery pack 5.

[0081] In some embodiments of this application, as shown in Figure 11, the distance between the third cross member 33 and the battery pack 5 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 11) may be M11, and M11 may satisfy the relation 250 mm ≤ M11 ≤ 350 mm. That is, M11 may be any value between 250 mm and 350 mm, for example, M11 may be 250 mm, 300 mm, 305 mm, 350 mm, etc., but is not limited to these. This installation allows for a reasonable distance between the third cross member 33 and the battery pack 5, which is advantageous in providing reliable protection to the battery pack 5.

[0082] In some embodiments of this application, as shown in Figure 11, the distance between the second sub-cross member 322 and the battery pack 5 along the first direction (i.e., the longitudinal direction of the vehicle, i.e., the X direction shown in Figure 11) may be M10, and the distance between the third cross member 33 and the battery pack 5 may be M11, and M10 and M11 may satisfy the relationship 0.4 ≤ M11 / M10 ≤ 0.5. That is, M11 / M10 may be any value between 0.4 and 0.5, for example, M11 / M10 may be 0.4, 0.448, 0.461, 0.5, etc., but is not limited to these. By installing in this manner, the ratio relationship between the distance M10 between the second sub-cross member 322 and the battery pack 5 and the distance M11 between the third cross member 33 and the battery pack 5 can be made rational, which is advantageous in reducing the probability of the battery pack 5 being damaged in a rear-end collision of the vehicle, and is advantageous in improving vehicle safety.

[0083] In some embodiments of this application, as shown in Figures 1 and 2, along the third direction, the length of the first sub-cross member 321 may be K5, the length of the second sub-cross member 322 may be K6, and the length of the third cross member 33 may be K7, and K5, K6, and K7 may satisfy the relation K6 ≤ K5 ≤ K7, that is, the length of the first sub-cross member 321 may be greater than or equal to the length of the second sub-cross member 322, and the length of the third cross member 33 may be greater than or equal to the length of the first sub-cross member 321. When installed in this manner, the length relationship between the first sub-cross member 321, the second sub-cross member 322, and the third cross member 33 can be made rational, which is advantageous in improving the structural strength and durability of the rear floor frame 3, allowing the rear floor frame 3 to meet the structural strength requirements of the vehicle body and improving the safety of the vehicle.

[0084] In some embodiments of this application, as shown in Figures 1 and 2, the rear floor frame 3 may further include an energy absorbing member 34, and the energy absorbing member 34 may be provided at least one end of the first side member body 3111 and / or the second side member body 3113.

[0085] Here, both the first side member body 3111 and the second side member body 3113 may extend along the longitudinal direction of the vehicle (i.e., the X direction shown in Figure 1). In some selectable embodiments of this application, an energy absorbing member 34 may be provided at the front end of the first side member body 3111, in some selectable embodiments of this application, an energy absorbing member 34 may be provided at the rear end of the first side member body 3111, in some selectable embodiments of this application, an energy absorbing member 34 may be provided at the front end of the second side member body 3113, and in some selectable embodiments of this application, an energy absorbing member 34 may be provided at the rear end of the second side member body 3113.

[0086] In some optional embodiments of this application, a sealing member may be provided on the inside of the side sill 4 to seal the gap between the vehicle body and the battery pack 5, and the first side sill body 3111 and the second side sill body 3113 may be connected to the side sill 4 and / or the sealing member, and by providing the energy absorbing member 34, when a rear collision occurs to the vehicle, the energy absorbing member 34 can be crushed to absorb energy and reduce the collision force transmitted to the front of the vehicle, thereby reducing the impact force received by the battery pack and reducing the impact force received by occupants in the passenger compartment, which is advantageous in improving vehicle safety.

[0087] As some of the selectable embodiments of this application, energy absorbing members 34 may be provided at the rear ends of both the first side member body 3111 and the second side member body 3113, as shown in Figures 1 and 2.

[0088] It should be explained that the shape and dimensions of the energy absorbing member 34 may be changed according to the dimensions of the vehicle's rear suspension.

[0089] According to the embodiment of the present application, the vehicle body unit 100 comprises a first side member body 3111 and / or a second side member body 3113 having extending members 313 that extend toward each other, and a cross member structure 32 is connected to the corresponding extending members 313, thereby improving the structural strength and durability of the rear floor frame 3, enabling the vehicle body unit 100 to meet the structural strength requirements, improving the safety of the vehicle, and providing good NVH performance for the vehicle body unit 100 of this structural type, thereby improving the user's driving experience.

[0090] In the description of this application, directions or positional relationships indicated by terms such as "center," "vertical," "horizontal," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are directions or positional relationships shown based on the drawings and are solely for the purpose of facilitating and simplifying the description of this application. They do not indicate or imply that the referred devices or elements have a particular orientation, are configured in a particular orientation, or must be operated in a particular orientation, and therefore should not be understood as limiting the present invention.

[0091] In the description of this application, “first feature” and “second feature” may include one or more such features.

[0092] In the description of this application, "multiple" means two or more.

[0093] In the description of this application, the fact that the first feature is "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 via another feature between them.

[0094] In the description of this application, the presence of the first feature "above," "above," and "upper side" of the second feature includes the presence of the first feature directly above and diagonally above the second feature, or simply indicates that the height of the first feature is greater than the height of the second feature.

[0095] In this specification, any reference to terms such as “one embodiment,” “several embodiments,” “exemplary embodiment,” “example,” “specific example,” or “several examples” means that the specific features, structures, materials, or properties described with reference to that embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be combined in an appropriate manner in any one or more embodiments or examples.

[0096] While examples and descriptions of embodiments of this application have been provided, various modifications, alterations, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, as will be understood by those skilled in the art. The scope of the present invention is limited by the claims and their equivalents. [Explanation of Symbols]

[0097] 100 car body units, 3. Rear floor frame, 31 Side member structure, 311 Side member body, 3111 First side member body, 3112 Restricting flange, 3113 Second side member body, 313 Extension member, 3131 Extension member body, 3132 Mounting bracket, 314 Extension member group, 3141 First extension member group, 3142 Second extension member group, 315 Side member reinforcing plate, 32 Cross member structure, 321 First sub-cross member, 322 Second sub-cross member, 33 Third cross member, 34 Energy absorbing member, 4 side sill, 47 first side sill, 472 first rear side sill, 480 rear side sill, 5 Battery pack, 51 First connecting member, 511 First mounting part, 5111 First mounting hole, 52 Second connecting member, 521 Second mounting part, 5211 Second mounting hole, 53 First sub-body, 54 Second sub-body

Claims

1. The rear floor frame includes a side member structure and a cross member structure, and a side sill connected to the side member structure, The side member structure includes a plurality of side member bodies, the plurality of side member bodies include a first side member body and a second side member body installed opposite to each other with a gap in between, and the first side member body and / or the second side member body have extending members that extend toward each other. The cross member structure is connected between the first side member body and the second side member body, and is connected to the corresponding extending member, in a vehicle body unit.

2. The vehicle body unit according to claim 1, wherein the first side member body and the second side member body each have the extending member, the extending member of the first side member body and the extending member of the second side member body are installed facing each other and spaced apart, and both ends of the cross member structure are connected to the corresponding extending members.

3. The vehicle body unit according to claim 1 or 2, wherein the first side member body and the second side member body each have a plurality of the extending members, and the plurality of the extending members of the first side member body and the plurality of the extending members of the second side member body correspond one-to-one to form a plurality of extending member groups, and the cross member structure is connected between two of the extending members of each extending member group.

4. The vehicle body unit according to claim 3, wherein the plurality of the extending member groups are sequentially spaced apart along the first direction of the rear floor frame.

5. A vehicle body unit according to claim 4, wherein the plurality of extending member groups include a first extending member group and a second extending member group, the cross member structure includes a first sub-cross member and a second sub-cross member, the first sub-cross member is connected between two extending members of the first extending member group, and the second sub-cross member structure is connected between two extending members of the second extending member group.

6. A vehicle body unit according to any one of claims 1 to 5, further comprising a battery pack, wherein the orthographic projection of the cross member structure and the orthographic projection of the battery pack have an overlapping region along the second direction of the rear floor frame.

7. The vehicle body unit according to claim 5, further comprising a battery pack, wherein, along the first direction, the distance between the first subcross member and the front end of the side member structure is smaller than the distance between the first subcross member and the rear end of the side member structure, and along the second direction of the rear floor frame perpendicular to the first direction, the orthogonal projection of the first subcross member and the orthogonal projection of the battery pack have an overlapping region.

8. The vehicle body unit according to claim 5 or 7, wherein, along the first direction, the distance between the second sub-cross member and the front end of the side member structure is greater than the distance between the second sub-cross member and the rear end of the side member structure.

9. The vehicle body unit according to any one of claims 1 to 8, further comprising a battery pack having a first connecting member connected to the end of the side sill near the side member structure.

10. The vehicle body unit according to claim 9, wherein the first connecting member has a first mounting portion, the first mounting portion is mounted in correspondence with the side sill, and the distance between the first mounting portion and the side member structure along the third direction of the rear floor frame is L3, satisfying the relation 30 mm ≤ L3 ≤ 80 mm.

11. The vehicle body unit according to claim 9 or 10, wherein there are multiple side sills, which are spaced apart along the third direction of the rear floor frame, and there are multiple first connecting members, which are provided on opposing sides of the main body of the battery pack along the third direction, and each of the multiple first connecting members is connected to the corresponding side sill.

12. The vehicle body unit according to claim 11, wherein the battery pack further comprises a second connecting member connected to the extending member.

13. The vehicle body unit according to claim 12, wherein the second connecting member has a second mounting portion, the second mounting portion is attached in correspondence with the extending member, the distance between the second mounting portion and the battery pack is L4 along the first direction of the rear floor frame, satisfying the relation 1 mm ≤ L4 ≤ 60 mm, and the third direction is perpendicular to the first direction.

14. The vehicle body unit according to claim 12 or 13, wherein the battery pack comprises a first sub-body and a second sub-body connected to each other, the width of the second sub-body being smaller than the width of the first sub-body along the third direction, the second connecting member being located at one end of the second sub-body away from the first sub-body, and the first connecting member being located at the side edge of the first sub-body.

15. The vehicle body unit according to claim 5, 7, or 8, further comprising a third cross member connected between the first side member body and the second side member body and located between the first sub-cross member and the second sub-cross member.

16. The vehicle body unit according to any one of claims 1 to 15, further comprising an energy absorbing member provided at at least one end of the first side member body and / or the second side member body.

17. A vehicle comprising a vehicle body unit according to any one of claims 1 to 16.

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