Rear vehicle body structure and vehicle

Abstract

A rear vehicle body structure and a vehicle. The rear vehicle body structure comprises a rear floor (1), a first side panel (2), a roof beam (3) and a second side panel (4) which are connected in sequence and form an annular structure. The rear floor (1) is provided with a first cross beam (5) and a second cross beam (7), the first side panel (2) and the second side panel (4) are each provided with a first vertical beam (6) and a second vertical beam (8), and the first cross beam (5), the first vertical beam (6) of the first side panel (2), the roof beam (3) and the first vertical beam (6) of the second side panel (4) are connected in sequence to form a first annular beam structure. The rear floor (1) is provided with the second cross beam (7), the first side panel (2) and the second side panel (4) are each provided with the second vertical beam (8), the second vertical beam (8) is connected to the first vertical beam (6) via a first connecting frame (9), and the second cross beam (7), the second vertical beam (8) and the first vertical beam (6) of the first side panel (2), the roof beam (3), and the first vertical beam (6) and the second vertical beam (8) of the second side panel (4) are connected in sequence to form a second annular beam structure.

Description

Rear body structure and vehicle

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202411380944.6, filed on September 30, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of vehicles, and in particular to a rear body structure and a vehicle. BACKGROUND

[0004] With the progress of science and technology and the development of the automobile industry, people's pursuit of convenience for getting on and off the vehicle is constantly improving, and a body structure without a B-pillar has gradually entered everyone's field of vision. Without the B-pillar, the space for getting on and off the vehicle is larger, and getting on and off the vehicle is more convenient.

[0005] The body includes a front body and a rear body. Due to the lack of support of the B-pillar, the bending and torsional stiffness of the rear body is low, which makes it difficult for the rear body of the B-pillar-free body to meet the requirements of bending and torsional resistance, and further leads to unsatisfactory vehicle performance in terms of NVH, VD, durability, and other vehicle performance. SUMMARY

[0006] The present disclosure aims to at least partially solve one of the technical problems in the related art.

[0007] To this end, one object of the present disclosure is to provide a rear body structure to solve or improve the problem of unsatisfactory vehicle performance due to the low bending and torsional stiffness of the rear body without the support of the B-pillar.

[0008] Another object of the present disclosure is to provide a vehicle comprising any of the above-mentioned rear body structures.

[0009] According to the rear body structure of the first aspect of the present disclosure, the rear body structure comprises a rear floor, a first side wall, a roof beam and a second side wall connected in sequence and forming a ring-shaped structure, wherein the rear floor is connected to the first side wall, the roof beam is connected to the first side wall and the second side wall, and the first side wall is connected to the second side wall.

[0010] The first cross beam and the second cross beam are arranged on the rear floor, the first vertical beam and the second vertical beam are arranged on the first side wall and the second side wall, the first cross beam, the first vertical beam on the first side wall, the roof beam and the first vertical beam on the second side wall are connected in sequence to form a first ring-shaped beam structure.

[0011] The second cross beam, the second vertical beam and the first vertical beam on the first side wall, the roof beam, the first vertical beam and the second vertical beam on the second side wall are connected in sequence to form a second ring-shaped beam structure.

[0012] Additional aspects and advantages of the present disclosure will be partially apparent from the following description, become apparent in addition to the following description, or be learned through the practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a schematic view of a rear body structure hiding a second side wall in an embodiment of the present disclosure;

[0014] Fig. 2 is a partial enlarged view of A in Fig. 1;

[0015] Fig. 3 is a schematic view of a rear body structure hiding a first side wall in an embodiment of the present disclosure;

[0016] Fig. 4 is a schematic view of a bottom structure of a rear body structure in an embodiment of the present disclosure;

[0017] Fig. 5 is a schematic view of a cross beam plate of a rear body structure in an embodiment of the present disclosure;

[0018] Fig. 6 is a schematic view of a longitudinal connecting beam of a rear body structure in an embodiment of the present disclosure;

[0019] Fig. 7 is a schematic view of a first side wall of a rear body structure in an embodiment of the present disclosure;

[0020] Fig. 8 is a schematic view of a second side wall of a rear body structure in an embodiment of the present disclosure;

[0021] Fig. 9 is a top view of a rear floor of a rear body structure in an embodiment of the present disclosure;

[0022] Fig. 10 is a schematic view of a mounting bracket of a rear body structure in an embodiment of the present disclosure;

[0023] Fig. 11 is a schematic view of a connection of a rocker beam, a battery package mounting longitudinal beam, and a rear floor of a rear body structure in an embodiment of the present disclosure;

[0024] Fig. 12 is a partial enlarged view of B in Fig. 11;

[0025] Fig. 13 is a schematic view of a battery package mounting longitudinal beam of a rear body structure in an embodiment of the present disclosure;

[0026] Fig. 14 is a schematic view of a front side of a rear bottom plate of a rear body structure in an embodiment of the present disclosure.

[0027] Reference signs: 1, rear floor; 2, first side wall; 3, roof cross beam; 4, second side wall; 5, first cross beam; 6, first vertical beam; 7, second cross beam; 8, second vertical beam; 9, first connecting frame; 10, third cross beam; 11, third vertical beam; 12, fourth cross beam; 13, fourth vertical beam; 131, reinforcing shell; 132, vertical rib; 14, second connecting frame; 15, cross beam plate; 16, support rib; 17, longitudinal connecting beam; 171, connecting plate; 172, rib plate; 18, stepped groove; 19, stepped surface; 20, rocker beam; 21, battery pack mounting point; 22, connecting part; 23, vertical reinforcing rib; 24, mounting frame; 25, transverse reinforcing rib groove; 251, transverse groove; 252, first connecting groove; 26, longitudinal reinforcing rib groove; 27, battery pack mounting longitudinal beam. DETAILED DESCRIPTION

[0028] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0029] Embodiments of the present disclosure are described below in conjunction with FIGS. 1 to 14.

[0030] According to embodiments of the present disclosure, in one aspect, as shown in FIGS. 1 to 3, a rear body structure is provided, including a rear floor 1, a first side wall 2, a roof cross beam 3, and a second side wall 4. The roof cross beam 3 is used to support the roof of the vehicle body. The bottom side of the first side wall 2 is connected to the first side of the rear floor 1, and the bottom side of the second side wall 4 is connected to the second side of the rear floor 1. The first end of the roof cross beam 3 is connected to the top side of the first side wall 2, and the second end of the roof cross beam 3 is connected to the top side of the second side wall 4, so that the rear floor 1, the first side wall 2, the roof cross beam 3, and the second side wall 4 are sequentially connected to form a rear body. The rear floor 1, the first side wall 2, the roof cross beam 3, and the second side wall 4 can be integrally die-cast.

[0031] A first cross beam 5 is arranged on the rear floor 1, and the first cross beam 5 is located on the front side of the rear floor 1. First vertical beams 6 are arranged on the first side wall 2 and the second side wall 4. The first end of the first cross beam 5 is connected to the first end of the first vertical beam 6 on the first side wall 2, the second end of the first vertical beam 6 on the first side wall 2 is connected to the first end of the roof cross beam 3, the second end of the roof cross beam 3 is connected to the second end of the first vertical beam 6 on the second side wall 4, and the first end of the first vertical beam 6 on the second side wall 4 is connected to the second end of the first cross beam 5, so that the first cross beam 5, the first vertical beam 6 on the first side wall 2, the roof cross beam 3, and the first vertical beam 6 on the second side wall 4 are sequentially connected to form a first annular beam structure, thereby increasing the bending and torsional stiffness of the rear body structure.

[0032] A second cross beam 7 is arranged on the rear floor 1, and the second cross beam 7 is located at the rear side of the first cross beam 5. Second vertical beams 8 are arranged on the first side wall 2 and the second side wall 4. The first end of the second cross beam 7 is connected with the first end of the second vertical beam 8 on the first side wall 2, and the second end of the second vertical beam 8 on the first side wall 2 is connected with the first vertical beam 6 on the first side wall 2 through the first connecting frame 9. The second end of the second vertical beam 8 on the second side wall 4 is connected with the first vertical beam 6 on the second side wall 4 through the first connecting frame 9. Thus, the second cross beam 7, the second vertical beam 8 on the first side wall 2, the first vertical beam 6 on the first side wall 2, the roof beam 3, the first vertical beam 6 on the second side wall 4, and the second vertical beam 8 on the second side wall 4 are sequentially connected to form a second ring-shaped beam structure, further increasing the bending and torsional stiffness of the rear body structure.

[0033] The presence of the first ring-shaped beam structure and the second ring-shaped beam structure increases the bending and torsional stiffness of the rear body, thereby improving the vehicle performance such as NVH, VD, durability, etc.

[0034] NVH is a commonly used term in the automotive industry, which stands for Noise, Vibration, and Harshness. These three aspects are key factors that affect the comfort of car passengers and the driving experience.

[0035] VD is the abbreviation of “Vehicle Dynamics”, which means vehicle dynamics. Vehicle dynamics is the study of the motion law of vehicles under various driving conditions, affected by external and internal forces and moments. It covers vehicle handling, stability, comfort, and other aspects, and is one of the important indicators for evaluating vehicle performance.

[0036] In an optional embodiment, as shown in FIG. 1 and FIG. 3, a third cross beam 10 is arranged on the rear floor 1, and the third cross beam 10 is located on the rear side of the rear floor 1. Third vertical beams 11 are arranged on the first side wall 2 and the second side wall 4. The first end of the third cross beam 10 is connected with the first end of the third vertical beam 11 on the first side wall 2, the second end of the third vertical beam 11 on the first side wall 2 is connected with the first end of the roof beam 3, the second end of the roof beam 3 is connected with the second end of the third vertical beam 11 on the second side wall 4, and the first end of the third vertical beam 11 on the second side wall 4 is connected with the second end of the third cross beam 10. Thus, the third cross beam 10, the third vertical beam 11 on the first side wall 2, the roof beam 3, and the third vertical beam 11 on the second side wall 4 are sequentially connected to form a third ring-shaped beam structure, thereby increasing the bending and torsional stiffness of the rear body structure.

[0037] A fourth cross beam 12 is arranged on the rear floor 1 and is located at the front side of the third cross beam 10. Fourth vertical beams 13 are arranged on the first side wall 2 and the second side wall 4. The first end of the fourth cross beam 12 is connected with the first end of the fourth vertical beam 13 on the first side wall 2, and the second end of the fourth vertical beam 13 on the first side wall 2 is connected with the third vertical beam 11 on the first side wall 2 through the second connecting frame 14. The second end of the fourth vertical beam 13 on the second side wall 4 is connected with the third vertical beam 11 on the second side wall 4 through the second connecting frame 14. Thus, the fourth cross beam 12, the fourth vertical beam 13 on the first side wall 2, the third vertical beam 11 on the first side wall 2, the roof beam 3, the third vertical beam 11 on the second side wall 4 and the fourth vertical beam 13 on the second side wall 4 are sequentially connected to form a fourth ring-shaped beam structure, further increasing the bending and torsional stiffness of the rear body structure.

[0038] The presence of the third ring-shaped beam structure and the fourth ring-shaped beam structure increases the bending and torsional stiffness of the rear body.

[0039] Among them, the first cross beam 5, the second cross beam 7, the third cross beam 10 and the fourth cross beam 12 are integrally die-cast on the rear floor 1. The first vertical beam 6, the second vertical beam 8, the third vertical beam 11 and the fourth vertical beam 13 are integrally die-cast on the first side wall 2 and the second side wall 4.

[0040] It is worth noting that the roof beam 3 can be provided with two, and the two ends of the two roof beams 3 are respectively connected to the first side wall 2 and the second side wall 4, and the two roof beams 3 jointly support the roof and the side walls on both sides, increasing the bending and torsional stiffness of the rear body. The first vertical beam 6 on the first side wall 2 and the second side wall 4 is respectively connected with the two ends of the first roof beam 3.

[0041] In this way, the third vertical beam 11 on the first side wall 2 and the second side wall 4 is respectively connected with the two ends of the second roof beam 3. The first cross beam 5, the first vertical beam 6 on the first side wall 2, the first roof beam 3 and the first vertical beam 6 on the second side wall 4 are sequentially connected to form a first ring-shaped beam structure. The second cross beam 7, the second vertical beam 8 on the first side wall 2, the first vertical beam 6 on the first side wall 2, the roof beam 3, the first vertical beam 6 on the second side wall 4 and the second vertical beam 8 on the second side wall 4 are sequentially connected to form a second ring-shaped beam structure.

[0042] The third cross beam 10, the third vertical beam 11 on the first side wall 2, the second roof beam 3 and the third vertical beam 11 on the second side wall 4 are sequentially connected to form a third ring-shaped beam structure. The fourth cross beam 12, the fourth vertical beam 13 on the first side wall 2, the third vertical beam 11 on the first side wall 2, the second roof beam 3, the third vertical beam 11 on the second side wall 4 and the fourth vertical beam 13 on the second side wall 4 are sequentially connected to form a fourth ring-shaped beam structure.

[0043] In some embodiments, as shown in FIGS. 4-6, a plurality of cross beam plates 15 are arranged transversely on the bottom surface of the rear floor 1, and the cross beam plates 15 can be arranged perpendicularly to the rear floor 1. Two adjacent cross beam plates 15 form a group, and the two cross beam plates 15 of each group form the first cross beam 5, the second cross beam 7, or the fourth cross beam 12. At least two support ribs 16 are arranged in the channel formed between the two cross beam plates 15 of each group. In the case of two support ribs 16, the two sides of the support ribs 16 are respectively connected to one cross beam plate 15, so that the two adjacent support ribs 16 and the cross beam plate 15 form a triangular shape.

[0044] In this embodiment, a plurality of support ribs 16 can be arranged, and the number of support ribs 16 can be arranged according to the length of the cross beam plate 15. Each support rib 16 is arranged along the extension direction of the channel to form a plurality of triangular shapes, so that each support rib 16 and the cross beam plate 15 form a triangular reinforcing structure. This makes the first cross beam 5, the second cross beam 7, or the fourth cross beam 12 have stronger bending and torsional stiffness, and enhances the bending and torsional stiffness of the rear floor 1.

[0045] As an optional embodiment, as shown in FIG. 4, a plurality of longitudinal connecting beams 17 are arranged on the rear floor 1, and each longitudinal connecting beam 17 is integrally formed by die casting on the rear floor 1.

[0046] In this embodiment, one end of each of the two longitudinal connecting beams 17 is connected to the first cross beam 5, and the other end of each of the two longitudinal connecting beams 17 is connected to the second cross beam 7, so that the first cross beam 5 and the second cross beam 7 are connected by the two longitudinal connecting beams 17, further increasing the bending and torsional stiffness of the rear floor 1.

[0047] In this embodiment, one end of each of the two longitudinal connecting beams 17 is connected to the third cross beam 10, and the other end of each of the two longitudinal connecting beams 17 is connected to the fourth cross beam 12, so that the third cross beam 10 and the fourth cross beam 12 are connected by the two longitudinal connecting beams 17, further increasing the bending and torsional stiffness of the rear floor 1.

[0048] For the longitudinal connecting beam 17, it can include two longitudinally arranged connecting plates 171, and the connecting plates 171 can be arranged perpendicularly to the bottom surface of the rear floor 1 to form the longitudinal connecting beam 17. A plurality of rib plates 172 can be arranged in the channel between the two connecting plates 171, and the two ends of the rib plates 172 are respectively connected to the two connecting plates 171. The plurality of rib plates 172 are arranged in sequence along the channel between the two connecting plates 171, thereby increasing the bending and torsional stiffness of the longitudinal connecting beam 17.

[0049] As an optional embodiment, as shown in FIGS. 8-9, the fourth vertical beam 13 comprises a reinforcing shell 131 and vertical ribs 132 arranged on the reinforcing shell 131. The reinforcing shell 131 is formed by bulging inward on the first side wall 2, i.e. in the direction close to the second side wall 4. Two vertical ribs 132 are arranged on the front and rear sides of the reinforcing shell 131 respectively, and the vertical ribs 132 are connected to the first side wall 2, thereby increasing the connection rigidity between the reinforcing shell 131 and the first side wall 2. The top end of the reinforcing shell 131 is connected to the second connecting frame 14, and the bottom end of the reinforcing shell 131 is connected to the rear floor 1 and connected to the fourth cross beam 12. The width of the reinforcing shell 131 increases from bottom to top, which facilitates the transmission of bending moment and torsion moment. A circular arc is arranged at the connection between the bottom end of the reinforcing shell 131 and the rear floor 1 to smoothly transition.

[0050] The reinforcing shell 131 is formed by bulging inward on the second side wall 4, i.e. in the direction close to the first side wall 2. Two vertical ribs 132 are arranged on the front and rear sides of the reinforcing shell 131 respectively, and the vertical ribs 132 are connected to the second side wall 4, thereby increasing the connection rigidity between the reinforcing shell 131 and the second side wall 4. The top end of the reinforcing shell 131 is connected to the second connecting frame 14, and the bottom end of the reinforcing shell 131 is connected to the rear floor 1 and connected to the fourth cross beam 12. The width of the reinforcing shell 131 increases from bottom to top, which facilitates the transmission of bending moment and torsion moment. A circular arc is arranged at the connection between the bottom end of the reinforcing shell 131 and the rear floor 1 to smoothly transition.

[0051] The reinforcing shell 131 of the fourth vertical beam 13 on the first side wall 2 and the second side wall 4 is provided with a shock absorber mounting point for mounting a shock absorber. Vertical reinforcing ribs 23 are arranged on the first side wall 2 and the second side wall 4, and the vertical ribs 132 are connected to the vertical reinforcing ribs 23, thereby further increasing the connection rigidity between the reinforcing shell 131 and the first side wall 2 or the second side wall 4.

[0052] In an optional embodiment, as shown in FIGS. 9 and 10, the rear body structure further comprises a mounting bracket 24. At least two mounting points are arranged on the mounting bracket 24, and the same number of connecting points are arranged on the rear floor 1 correspondingly. The mounting points on the mounting bracket 24 and the mounting points on the rear floor 1 are connected one by one, so that the mounting bracket 24 is connected to the rear floor 1. A plurality of mounting positions are arranged on the mounting bracket 24, and electrical elements such as 12V super capacitor, storage battery, lithium battery and domain controller can be arranged. Since the mounting bracket 24 is connected to the rear floor 1 through at least two mounting points, the mounting bracket 24 plays a role of connection reinforcement, thereby increasing the bending and torsional rigidity of the corresponding position on the rear floor 1.

[0053] In further embodiments, as shown in Fig. 10, transverse stiffener grooves 25 and longitudinal stiffener grooves 26 are provided on the mounting bracket 24, increasing the bending and torsional stiffness of the mounting bracket 24, and thus further increasing the bending and torsional stiffness of the corresponding locations on the rear floor 1. In some embodiments, the transverse stiffener grooves 25 and the longitudinal stiffener grooves 26 are each provided in multiple numbers and are arranged in a cross pattern, further increasing the bending and torsional stiffness of the mounting bracket 24.

[0054] In some embodiments, the transverse stiffener grooves 25 include two transverse grooves 251 opened transversely, and a plurality of first connecting grooves 252 opened between the two transverse grooves 251, forming a triangular structure between adjacent two first connecting grooves 252 and the transverse grooves 251. The first connecting grooves 252 are arranged in sequence between the two transverse grooves 251 to form a plurality of triangular structures, further increasing the reinforcing effect of the transverse stiffener grooves 25.

[0055] In some embodiments, the longitudinal stiffener grooves 26 include two longitudinal grooves 261 opened longitudinally, and a plurality of second connecting grooves 262 opened between the two longitudinal grooves 261, forming a triangular structure between adjacent two second connecting grooves 262 and the longitudinal grooves 261. The second connecting grooves 262 are arranged in sequence between the two longitudinal grooves 261 to form a plurality of triangular structures, further increasing the reinforcing effect of the longitudinal stiffener grooves 26.

[0056] In the case where the fourth vertical beam 13 includes a reinforcing shell 131, mounting points can be provided on the reinforcing shell 131, and a mounting point on the mounting bracket 24 can be connected to a mounting point on the reinforcing shell 131, facilitating the transmission of bending moments and torsional moments received by the mounting bracket 24.

[0057] As an optional embodiment, as shown in Figs. 11-14, the rear body structure further includes a battery pack mounting longitudinal beam 27 for connecting and supporting a battery. The battery pack mounting longitudinal beam 27 is provided in two numbers and is connected to the left and right sides of the front side edge of the rear floor 1, respectively. The front side of the battery pack mounting longitudinal beam 27 is connected to the front body. A stepped groove 18 is provided on the front side edge of the rear floor 1, a connecting portion 22 is provided on the rear side of the battery pack mounting longitudinal beam 27, and a stepped surface 19 is provided on the connecting portion 22. The connecting portion 22 on the battery pack mounting longitudinal beam 27 is inserted into the stepped groove 18 for connection, so that the stepped surface 19 on the connecting portion 22 is connected to the groove wall of the stepped groove 18. In this way, the connecting surface of the connecting portion 22 and the stepped groove 18 is larger, thereby making the connection between the battery pack mounting longitudinal beam 27 and the rear floor 1 more stable, increasing the connection rigidity between the battery pack mounting longitudinal beam 27 and the rear floor 1, and enhancing the bending and torsional stiffness of the rear body structure.

[0058] In a further embodiment, the rear body structure further comprises a rocker beam 20 connected with the rear floor 1 and the battery pack mounting longitudinal beam 27 respectively. The rocker beam 20 is used to support the door sill of the vehicle door. A plurality of battery pack mounting points 21 for mounting the battery pack are arranged on the bottom of the rocker beam 20. A plurality of battery pack mounting points 21 for mounting the battery pack are arranged on the front side of the bottom of the rear floor 1. A plurality of battery pack mounting points 21 for mounting the battery pack are arranged on the bottom of the battery pack mounting longitudinal beam 27.

[0059] By arranging the battery pack on the battery pack mounting points 21 of the rocker beam 20, the rear floor 1 and the battery pack mounting longitudinal beam 27 respectively, the battery pack connects the rocker beam 20, the rear floor 1 and the battery pack mounting longitudinal beam 27 together, which increases the connection rigidity between the rocker beam 20, the rear floor 1 and the battery pack mounting longitudinal beam 27, thereby enhancing the bending and torsional stiffness of the rear body structure.

[0060] According to embodiments of the present disclosure, in a further aspect, there is also provided a vehicle comprising any of the rear body structures described above.

[0061] Wherein the transverse direction is the front-rear direction of the vehicle body, the longitudinal direction is the left-right direction of the vehicle body, and the vertical direction is the up-down direction of the vehicle body.

[0062] Although the embodiments of the present disclosure are described in conjunction with the accompanying drawings, various modifications and changes can be suggested by those skilled in the art without departing from the spirit and scope of the present disclosure, and such modifications and changes are intended to fall within the scope of the present disclosure.

Claims

1. A rear body structure comprising: The rear floor (1), the first side wall (2), the roof beam (3) and the second side wall (4) are sequentially connected and form a ring structure, wherein, The rear floor (1) is provided with a first cross beam (5) and a second cross beam (7), the first side wall (2) and the second side wall (4) are each provided with a first vertical beam (6) and a second vertical beam (8), the first cross beam (5), the first vertical beam (6) on the first side wall (2), the roof beam (3) and the first vertical beam (6) on the second side wall (4) are sequentially connected to form a first ring beam structure. The second cross beam (7), the second vertical beam (8) on the first side wall (2) and the first vertical beam (6), the roof beam (3), the first vertical beam (6) on the second side wall (4) and the second vertical beam (8) are sequentially connected to form a second ring beam structure.

2. The rear body structure according to claim 1, wherein The rear side of the rear floor (1) is provided with a third cross beam (10), the rear side of the first side wall (2) and the second side wall (4) is each provided with a third vertical beam (11), the third cross beam (10), the third vertical beam (11) on the first side wall (2), the roof beam (3) and the third vertical beam (11) on the second side wall (4) are sequentially connected to form a third ring beam structure. The rear floor (1) is provided with a fourth cross beam (12), the first side wall (2) and the second side wall (4) are each provided with a fourth vertical beam (13), the fourth vertical beam (13) is connected with the third vertical beam (11) through a second connecting frame (14), the fourth cross beam (12), the fourth vertical beam (13) on the first side wall (2) and the third vertical beam (11), the roof beam (3), the third vertical beam (11) on the second side wall (4) and the fourth vertical beam (13) are sequentially connected to form a fourth ring beam structure.

3. The rear body structure according to claim 2, wherein A plurality of cross beam plates (15) are transversely arranged on the rear floor (1), the cross beam plates (15) are two by two in a group, each group of cross beam plates (15) forms the first cross beam (5), the second cross beam (7) and the fourth cross beam (12) respectively, at least two supporting ribs (16) are arranged between each group of cross beam plates (15), and adjacent two supporting ribs (16) and the cross beam plate (15) combine to form a triangular reinforcing structure.

4. The rear body structure according to claim 2, wherein A plurality of longitudinal connecting beams (17) are further arranged on the rear floor (1), the first cross beam (5) and the second cross beam (7) are connected through the longitudinal connecting beams (17), and the second cross beam (7) and the third cross beam (10) are connected through the longitudinal connecting beams (17).

5. The rear body structure according to claim 2, wherein The fourth vertical beam (13) comprises a reinforcing shell (131) and vertical ribs (132) arranged on the reinforcing shell (131), the reinforcing shell (131) gradually increases in width from bottom to top, the top end of the reinforcing shell (131) is connected with the second connecting frame (14), the bottom end of the reinforcing shell (131) is connected with the fourth horizontal beam (12), the vertical ribs (132) are provided in two, the two vertical ribs (132) are respectively arranged on the two sides of the reinforcing shell (131), and the vertical ribs (132) are connected with the first side wall (2) or the second side wall (4).

6. The rear body structure according to any one of claims 1-5, further comprising: a mounting bracket (24) provided with at least two mounting points connected to the rear floor (1), the mounting bracket (24) being adapted to mount electrical elements.

7. The rear body structure according to claim 6, wherein The mounting bracket (24) is provided with transverse reinforcing rib grooves (25) and longitudinal reinforcing rib grooves (26), the transverse reinforcing rib grooves (25) and the longitudinal reinforcing rib grooves (26) being arranged in cross.

8. The rear body structure according to any one of claims 1-7, further comprising: A battery pack mounting longitudinal beam (27) for mounting a battery pack, the rear floor (1) being provided with a stepped groove (18), the battery pack mounting longitudinal beam (27) being provided with a connecting portion (22) having a stepped surface (19), the connecting portion (22) being inserted into the stepped groove (18) and the stepped surface (19) being connected with the groove wall of the stepped groove (18).

9. The rear body structure of claim 8, further comprising: A rocker beam (20) for supporting a rocker, the rocker beam (20) being connected with the rear floor (1) and the battery pack mounting longitudinal beam (27) respectively, the battery pack mounting longitudinal beam (27), the rocker beam (20) and the rear floor (1) all being provided with battery pack mounting points (21) for mounting a battery pack.

10. A vehicle comprising: The rear body structure according to any one of claims 1-9.

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