Rear structure of a vehicle body

Abstract

The invention discloses a vehicle body rear structure, comprising a middle floor, a rear floor, a rear wheel cover and a rear side wall, wherein the middle floor is spliced ​​with the rear floor, the rear wheel cover is located below the rear side wall and above the middle floor and the rear floor, and the vehicle body rear structure also comprises a rear side wall inner reinforcement plate, a rear wheel cover inner reinforcement plate, a rear wheel cover bracket and a rear floor lower cross beam; wherein the rear side wall inner reinforcement plate is located inside the rear side wall, the rear wheel cover inner reinforcement plate is located on the side of the rear wheel cover close to the vehicle body, and the rear wheel cover bracket is connected to the bottom of the rear wheel cover inner reinforcement plate; one end of the rear wheel cover inner reinforcement plate is connected to the rear side wall inner reinforcement plate and the rear wheel cover, and the other end is connected to the rear wheel cover bracket and the rear wheel cover; one end of the rear wheel cover bracket is connected to the rear wheel cover inner reinforcement plate and the rear wheel cover, and the other end is connected to the rear floor; the rear floor lower cross beam is laid below the rear floor, is located below the rear wheel cover bracket, and extends along the width direction of the vehicle body. The invention makes the force transmission more coherent and reasonable by constructing the overlapping relationship of each component, and reduces the stress concentration.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile structural construction, and in particular to a rear body structure of a new energy automobile. Background Art

[0002] With the rapid development of automobile technology, people have higher and higher requirements on the overall performance, safety and comfort of automobiles, and the joint structure between the rear wheel cover, rear floor and upper body seriously affects the overall performance of the automobile.

[0003] At present, the technical problems existing in the layout structure of the rear wheel cover, rear floor and upper body of new energy vehicles are as follows:

[0004] First, the rear wheel cover is generally weak, and without internal and external reinforcement plates, the strength is difficult to meet the requirements;

[0005] Second, if the power battery of a new energy vehicle is deformed too much, it is easy to cause a battery fire, so the rear impact performance is very important;

[0006] Third, the forces on the body at the rear wheel arch and rear floor are relatively complex, mainly including the impact force of the shock absorber on the body, the force of the spring on the tower seat, the gravity of the power battery itself, and the impact force of the chassis on the rear suspension installation point, etc. Therefore, the welding points there are prone to failure. How to conduct and disperse the complex forces and arrange a reasonable force transmission path has always been a difficulty in the development of the rear body;

[0007] Fourth, as users have higher and higher requirements for riding comfort, the rear seats are usually equipped with brackets on the floor. This method is easy to cause impact on the buttocks on sloped roads with large impacts, which has become a major complaint in the market.

[0008] Fifth, during the opening and closing of the rear door and during driving, the rear side panel lock is subjected to a large impact force, which can easily cause the side panel sheet metal to crack;

[0009] Sixth, for SUV models, the rear body has no coat rack structure, which is not conducive to the bending and torsional stiffness and fatigue performance of the vehicle.

[0010] In general, the main problems with the structure of the rear wheel arch, rear floor and upper body are structural inconsistency, unreasonable force transmission, heavy weight, and difficulty in comprehensive performance consideration.

[0011] In some existing models, in order to meet the complex force, two crossbeams are generally arranged on the rear floor. One crossbeam is located near the spare tire pool. In order to ensure the strength and mode of the spare tire, the other crossbeam is located near the spring tower seat installation point. It is connected to the wheel cover through the inner reinforcement plate of the wheel cover by the up and down buckle method. In order to ensure the structural penetration at the rear shock absorber, the inner reinforcement plate of the wheel cover generally needs to be made into a large M-shaped structure. In addition, there is no overlap between the outer reinforcement plate of the wheel cover and the spring tower seat reinforcement plate, the rear door lock installation position and the outer reinforcement plate of the side wall, and the power battery installation point is arranged on the left and right longitudinal beams, and has no overlap with the rear floor crossbeam and spare tire. In addition, in order to share the platform with traditional fuel vehicles, the rear of the battery is flush with the rear of the front floor, resulting in a small battery module space and a short vehicle range.

[0012] The rear wheel cover, rear floor and upper body of the above-mentioned vehicle model have the following problems in their layout structure:

[0013] First, because the crossbeam on the rear floor is arranged directly opposite the spring tower mounting point, the layout space of the rear seats and spare tire well is greatly limited;

[0014] Second, in order to ensure that the force transmission between the crossbeam and the shock absorber tower is continuous, the reinforcing plate inside the wheel arch generally needs to be made into an M-shaped structure, which not only increases the weight but also squeezes the space inside the car;

[0015] Third, although the spare tire lower crossbeam can ensure the performance of the spare tire strength modal, it will lead to problems such as the need to avoid cutting edges at the overlapped edges, and cause weight increase;

[0016] Fourth, the power battery installation points are evenly distributed on the left and right longitudinal beams, with no overlap with the rear floor beam and spare tire, so the rear impact performance cannot be guaranteed;

[0017] Fifth, the rear door lock installation position has no overlap with the side panel outer reinforcement plate. When the rear door is opened and closed and during driving, the rear side panel is subjected to a large impact force from the lock, and there is no force transmission path to transmit it, which can easily cause the side panel sheet metal to crack.

[0018] Sixth, the rear seats are usually equipped with brackets on the floor, which easily causes impact on the buttocks when driving on a slope with a large impact, becoming the main pain point complained about in the market;

[0019] Seventh, there is no overlap between the wheel house outer reinforcement plate and the spring tower seat reinforcement plate, the force transmission path is discontinuous, the force on the spring tower seat cannot be transmitted to the upper body, and a complete closed-loop force transmission path is not formed;

[0020] Eighth, the structure of the wheel arch and the rear floor is relatively complex. It is difficult to stamp the reinforcing plate inside the M-type wheel arch, and the overlapping parts often need to avoid each other and cut edges. The manufacturing process is relatively complicated, affecting the production rhythm and efficiency. Summary of the invention

[0021] Based on this, the present invention provides a rear body structure of a new energy vehicle. The present invention makes the force transmission more coherent and reasonable and reduces the stress concentration by constructing the overlapping relationship between the rear floor under-beam, the rear wheel cover bracket, the rear spring tower support plate, the rear wheel cover outer reinforcement plate, the rear side reinforcement plate, and the D-pillar reinforcement plate.

[0022] To achieve the above object, the present invention provides the following technical solutions:

[0023] The rear wheel housing is located below the rear wheel housing and above the middle floor and the rear floor, the rear wheel housing inner reinforcement plate is located inside the rear wheel housing, the rear wheel housing inner reinforcement plate is located inside the vehicle body and inside the rear wheel housing, the rear wheel housing bracket is located below the rear wheel housing inner reinforcement plate and is connected to the bottom of the rear wheel housing inner reinforcement plate; one end of the rear wheel housing inner reinforcement plate is connected to the rear side housing inner reinforcement plate and the rear wheel housing, and the other end is connected to the rear wheel housing bracket and the rear wheel housing; one end of the rear wheel housing bracket is connected to the rear wheel housing inner reinforcement plate and the rear wheel housing, and the other end is connected to the rear floor; the rear floor under-cross beam is laid below the rear floor and is located below the rear wheel housing bracket, and the rear floor under-cross beam extends in the width direction of the vehicle body.

[0024] As a preferred technical solution of the present invention, the rear floor comprises a recess for accommodating a spare tire with the opening facing the interior of the vehicle body, and the bottom of the rear wheel cover bracket is close to the upper edge of the recess of the rear floor.

[0025] As a preferred technical solution of the present invention, it also includes two rear longitudinal beams; the two rear longitudinal beams are laid below the rear floor and on the sides of the recess, and are respectively vertically connected to the ends of the cross beam under the rear floor.

[0026] As a preferred technical solution of the present invention, it also includes a battery mounting bracket; the battery mounting bracket includes an inner cavity box and a connecting plate located on one side of the inner cavity box, one end of the connecting plate is connected to the middle floor and the rear floor, and the other end is connected to the rear longitudinal beam.

[0027] As a preferred technical solution of the present invention, it also includes a rear seat mounting reinforcement plate; the rear seat mounting reinforcement plate is located directly below the middle floor, one end of which is connected to the middle floor, and the other end is connected to the rear floor lower cross beam and the rear floor.

[0028] As a preferred technical solution of the present invention, it also includes a rear wheel cover outer reinforcement plate; the rear wheel cover outer reinforcement plate is located on the outside of the rear wheel cover, one end of which is connected to the rear wheel cover, and the other end is connected to one end of the rear longitudinal beam close to the cross beam under the rear floor.

[0029] As a preferred technical solution of the present invention, it also includes a rear wheel cover outer panel; the rear wheel cover outer panel extends along the outer contour of the rear wheel cover, and the rear wheel cover outer reinforcement plate is connected to the rear wheel cover and the rear wheel cover outer panel.

[0030] As a preferred technical solution of the present invention, it also includes a rear spring tower seat support plate and a rear spring tower seat; the rear spring tower seat support plate is located at the connection between the rear longitudinal beam and the rear floor under-cross beam, and is connected to one end of the rear wheel cover outer reinforcement plate; the rear spring tower seat is connected to the outer side of the rear spring tower seat support plate.

[0031] As a preferred technical solution of the present invention, it also includes a rear side panel outer reinforcement plate; the rear side panel outer reinforcement plate is located above the rear wheel cover outer panel, one end of which is connected to the upper part of the rear wheel cover outer panel and the rear side panel inner reinforcement plate, and the other end is connected to the lower part of the rear side panel inner reinforcement plate.

[0032] As a preferred technical solution of the present invention, it also includes a D-pillar reinforcement plate; the D-pillar reinforcement plate is located above the rear side outer reinforcement plate, one end of which is connected to the rear side outer reinforcement plate, and the other end is connected to the roof crossbeam.

[0033] As a preferred technical solution of the present invention, it also includes a rear door lock reinforcement bracket; the rear door lock reinforcement bracket is located at the lower part of the rear side outer reinforcement plate, one end of which is connected to the rear side outer reinforcement plate, and the other end is connected to the rear wheel cover outer panel.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The connection method between the rear wheel housing bracket and the crossbeam under the rear floor makes the force transmission path at the shock absorber tower and the spring tower more reasonable, reduces the crossbeam on the rear floor, optimizes the layout space of the rear seats and spare tire pool, and meets the requirements of lightweight;

[0036] (2) The rear mounting bracket of the power battery is arranged on the rear floor crossbeam and the rear longitudinal beam, which can not only improve the defect of only relying on the front floor longitudinal beam to bear the load, but also meet the impact performance of the rear of the power battery, effectively increasing the battery's cruising range;

[0037] (3) The middle floor is lifted upwards, and the rear seat installation reinforcement plate is overlapped under the rear floor lower crossbeam, which can not only improve the seat comfort but also ensure the strength of the seat installation point;

[0038] (4) The crossbeam under the rear floor can not only strengthen the local strength and mode of the spare tire pool, but also help to disperse the load on the power battery, rear seats, and spring tower seat;

[0039] (5) The rear spring tower is connected to the rear wheel housing outer reinforcement plate through the rear spring tower support plate, and is connected to the rear side outer reinforcement plate and the D-pillar reinforcement plate through the rear wheel housing, which not only straightens out the force transmission path of the spring tower and the shock absorber tower, but also forms a closed-loop and coherent force transmission path, reduces the force concentration in the local area, and makes the whole structure more coherent and compact, and the force transmission is more reasonable;

[0040] (6) The overlap between the rear door lock reinforcement bracket and the rear side panel outer reinforcement plate allows the rear door opening and closing impact force to be transmitted through the rear side panel outer reinforcement plate, reducing the risk of cracking of the rear door lock and the installation area;

[0041] (7) The inverted triangle structure of the D-pillar reinforcement plate can not only transmit the loads on the rear spring tower and rear shock absorber tower, but also improve the bending and torsional performance of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the internal three-dimensional structure of a vehicle body rear structure according to the present invention;

[0043] Figure 2 It is a schematic diagram of a three-dimensional structure of a vehicle body rear structure according to the present invention, viewed from a certain bottom angle;

[0044] Figure 3 It is a schematic diagram of a three-dimensional structure of a vehicle body rear structure according to the present invention, viewed from a certain bottom angle;

[0045] Figure 4 The present invention is a schematic diagram of the three-dimensional structure of a vehicle body rear structure viewed from a certain angle from the front. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1-4 A rear vehicle body structure includes a middle floor 8, a rear floor 13, a rear wheel cover 18 and a rear side panel. The middle floor 8 is spliced ​​with the rear floor 13. The middle floor 8 is located in the middle of the bottom of the vehicle body. The rear floor 13 is located at the rear of the bottom of the vehicle body. The rear side panel is located at the rear side of the vehicle body. The rear wheel cover 18 is located below the rear side panel and above the middle floor 8 and the rear floor 13.

[0048] The rear vehicle body structure also includes a rear side wall inner reinforcement plate 1, a rear wheel cover inner reinforcement plate 3, a rear wheel cover bracket 4 and a rear floor lower cross beam 12; wherein, the rear side wall inner reinforcement plate 1 is located on the inner side of the rear side wall, the rear wheel cover inner reinforcement plate 3 is located inside the vehicle body and on the inner side of the rear wheel cover 18, the rear wheel cover bracket 4 is located on the lower side of the rear wheel cover inner reinforcement plate 3 and is welded to the bottom of the rear wheel cover inner reinforcement plate 3; one end of the rear wheel cover inner reinforcement plate 3 is welded to the rear side wall inner reinforcement plate 1 and the rear wheel cover 18, and the other end is welded to the rear wheel cover bracket 4 and the rear wheel cover 18; one end of the rear wheel cover bracket 4 is welded to the rear wheel cover inner reinforcement plate 3 and the rear wheel cover 18, and the other end is welded to the rear floor 13; the rear floor lower cross beam 12 is laid below the rear floor 13, is located below the rear wheel cover bracket 4, and extends along the width direction of the vehicle body.

[0049] As a preferred embodiment of the present invention, the rear floor 13 includes a recess 14 opening toward the interior of the vehicle body for accommodating a spare tire. The bottom of the rear wheel housing bracket 4 is close to the upper edge of the recess 14 of the rear floor 13 .

[0050] As a preferred embodiment of the present invention, the rear vehicle body structure further includes a rear longitudinal beam 16; the rear longitudinal beam 16 is laid below the rear floor 13 and on the side of the recess, and is vertically connected to the rear floor lower cross beam 12. There are two rear longitudinal beams 16, which are arranged around the recess 14 together with the rear floor lower cross beam 12. The rear floor lower cross beam 12 is connected and penetrated with the recess 14 and the rear wheel cover bracket 4, so as to improve the spare tire pool modality and the bending and torsion performance of the whole vehicle.

[0051] As a preferred embodiment of the present invention, the rear vehicle body structure also includes a rear wheel cover outer reinforcement plate 9; the rear wheel cover outer reinforcement plate 9 is located on the outside of the rear wheel cover 18, one end of which is welded to the rear wheel cover 18, and the other end is welded to one end of the rear longitudinal beam 16 close to the rear floor under-cross beam 12.

[0052] As a preferred embodiment of the present invention, the rear vehicle body structure also includes a rear wheel housing outer panel 7; the rear wheel housing outer panel 7 extends along the outer contour of the rear wheel housing 18, and the rear wheel housing outer reinforcement plate 9 is welded to the rear wheel housing 18 and the rear wheel housing outer panel 7.

[0053] As a preferred embodiment of the present invention, the rear vehicle body structure also includes a rear spring tower seat support plate 10 and a rear spring tower seat 11; the rear spring tower seat support plate 10 is located at the connection between the rear longitudinal beam 16 and the rear floor under-cross beam 12, and is welded to one end of the rear wheel cover outer reinforcement plate 9; the rear spring tower seat 11 is welded to the outer side of the rear spring tower seat support plate 10.

[0054] As a preferred embodiment of the present invention, the rear structure of the vehicle body also includes a rear side outer reinforcement plate 5; the rear side outer reinforcement plate 5 is located above the rear wheel housing outer panel 7, one end of which is welded to the rear wheel housing outer panel 7 and the upper part of the rear side inner reinforcement plate 1, and the other end is welded to the lower part of the rear side inner reinforcement plate 1.

[0055] As a preferred embodiment of the present invention, the rear structure of the vehicle body further includes a D-pillar reinforcement plate 2; the D-pillar reinforcement plate 2 is located above the rear side outer reinforcement plate 5, one end of which is welded to the rear side outer reinforcement plate 5, and the other end is welded to the top cover crossbeam. The rear spring tower support plate 10 and the rear wheel cover outer reinforcement plate 9 are connected and penetrated, so that a closed loop and a connecting and penetrating force transmission path are formed between the rear spring tower support plate 10, the rear wheel cover outer reinforcement plate 9, the rear side outer reinforcement plate 5 and the D-pillar reinforcement plate 2. The D-pillar reinforcement plate 2 is preferably an inverted triangle structure to improve the bending and torsional performance of the whole vehicle.

[0056] As a preferred embodiment of the present invention, the rear structure of the vehicle body further includes a battery mounting bracket 17; the battery mounting bracket 17 includes an inner cavity box and a connecting plate located on one side of the inner cavity box, one end of the connecting plate is welded to the middle floor 8 and the rear floor 13, and the other end is welded to the rear longitudinal beam 16. The battery mounting bracket 17 is overlapped with the middle floor 8 and the rear floor 13 to meet the rear impact performance of the power battery.

[0057] As a preferred embodiment of the present invention, the rear structure of the vehicle body further includes a rear door lock reinforcement bracket 6; the rear door lock reinforcement bracket 6 is located at the lower part of the rear side outer reinforcement plate 5, one end of which is welded to the rear side outer reinforcement plate 5, and the other end is welded to the rear wheel housing outer plate 7. The rear door lock reinforcement bracket 6 is overlapped with the rear side outer reinforcement plate 5 to meet the impact strength of the rear door opening and closing.

[0058] As a preferred embodiment of the present invention, the rear structure of the vehicle body further includes a rear seat installation reinforcement plate 15; the rear seat installation reinforcement plate 15 is located directly below the middle floor 8, one end of which is welded to the middle floor 8, and the other end is welded to the rear floor lower cross beam 12 and the rear floor 13. The rear seat installation reinforcement plate 15 overlaps the rear floor 13 and the rear floor lower cross beam 12 to improve the installation strength of the rear seat.

[0059] The rear wheel housing bracket 4 is welded to the rear floor lower cross beam 12 through the rear floor 13, eliminating the rear floor upper cross beam, thereby optimizing the layout space of the rear seat and the rear floor. The power battery is overlapped on the rear longitudinal beam 16 and the rear floor lower cross beam 12 through the power battery mounting bracket 17, and then the rear impact force is borne by the rear longitudinal beam 16 and the rear floor lower cross beam 12. The rear floor lower cross beam 12 can not only strengthen the local mode and strength of the spare tire pool, but also transmit the load on the rear spring tower seat. The load on the rear spring tower seat 11 is transmitted to the rear wheel housing outer reinforcement plate 9 through the rear spring tower seat support plate 10, and then dispersed through the rear side outer reinforcement plate 5 and the D-pillar reinforcement plate 2. Conversely, the force of the shock absorber tower seat on the rear wheel housing outer reinforcement plate 9 can also be transmitted through the rear spring tower seat support plate 10 and the rear floor lower cross beam 12, forming a closed loop and connecting the through force transmission path, reducing the force concentration in the local area, making the entire structure more coherent and compact, and the force transmission more reasonable. The impact force of the rear door opening and closing is transmitted to the rear side outer reinforcement plate 5 through the rear door lock reinforcement bracket 6, reducing the risk of cracking in the rear door lock installation area.

[0060] The reinforcement structure on the outside of the rear wheel cover extends upward from the rear spring tower seat 11 through the rear spring tower seat support plate 10, the rear wheel cover outer reinforcement plate 9, and the rear side panel outer reinforcement plate 5 to the D-pillar reinforcement plate 2. The reinforcement structure on the inside of the rear wheel cover extends upward from the rear floor lower cross beam 12 through the rear floor 13, the rear wheel cover bracket 4, the rear wheel cover inner reinforcement plate 3, and the rear side panel inner reinforcement plate 1 to the D-pillar reinforcement plate 2, forming two continuous force transmission paths, and a relatively stable inverted V-shaped structure is formed between the two continuous force transmission paths, so that the rear vehicle body structure of the present invention can meet the structural strength requirements even when the upper cross beam on the rear floor is eliminated, thereby optimizing the layout space of the rear seats and the spare tire well.

[0061] The rear wheel cover and rear floor structure of the present invention makes the force transmission more consistent and reasonable and reduces stress concentration by constructing the overlapping relationship between the rear floor lower cross beam, the rear wheel cover bracket, the rear spring tower seat support plate, the rear wheel cover outer reinforcement plate, the rear side reinforcement plate, and the D-pillar reinforcement plate.

[0062] Based on the above, the present invention has the advantages that:

[0063] (1) The connection method between the rear wheel housing bracket and the crossbeam under the rear floor makes the force transmission path at the shock absorber tower and the spring tower more reasonable, reduces the crossbeam on the rear floor, optimizes the layout space of the rear seats and spare tire pool, and meets the requirements of lightweight;

[0064] (2) The rear mounting bracket of the power battery is arranged on the rear floor crossbeam and the rear longitudinal beam, which can not only improve the defect of only relying on the front floor longitudinal beam to bear the load, but also meet the impact performance of the rear of the power battery, effectively increasing the battery's cruising range;

[0065] (3) The middle floor is lifted upwards, and the rear seat mounting reinforcement plate is overlapped under the rear floor lower crossbeam, which can not only improve the seat comfort but also ensure the strength of the seat mounting point;

[0066] (4) The crossbeam under the rear floor can not only strengthen the local strength and mode of the spare tire pool, but also help to disperse the load on the power battery, rear seats, and spring tower seat;

[0067] (5) The rear spring tower is connected to the rear wheel housing outer reinforcement plate through the rear spring tower support plate, and is connected to the rear side outer reinforcement plate and the D-pillar reinforcement plate through the rear wheel housing. This not only straightens out the force transmission path of the spring tower and the shock absorber tower, forming a closed-loop and coherent force transmission path, but also reduces the force concentration in the local area, making the entire structure more coherent and compact, and the force transmission more reasonable;

[0068] (6) The overlap between the rear door lock reinforcement bracket and the rear side panel outer reinforcement plate allows the rear door opening and closing impact force to be transmitted through the rear side panel outer reinforcement plate, reducing the risk of cracking of the rear door lock and the installation area;

[0069] (7) The inverted triangle structure of the D-pillar reinforcement plate can not only transmit the loads on the rear spring tower and rear shock absorber tower, but also improve the bending and torsional performance of the entire vehicle.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle body rear structure, comprising a middle floor (8), a rear floor (13), a rear wheel cover (18) and a rear side panel, wherein the middle floor (8) is spliced ​​with the rear floor (13), the rear wheel cover (18) is located below the rear side panel and above the middle floor (8) and the rear floor (13), and characterized in that: The vehicle body also comprises a rear side inner reinforcement plate (1), a rear wheel cover inner reinforcement plate (3), a rear wheel cover bracket (4) and a rear floor lower cross beam (12); wherein the rear side inner reinforcement plate (1) is located on the inner side of the rear side, the rear wheel cover inner reinforcement plate (3) is located on the side of the rear wheel cover (18) close to the interior of the vehicle body, and the rear wheel cover bracket (4) is connected to the bottom of the rear wheel cover inner reinforcement plate (3); one end of the rear wheel cover inner reinforcement plate (3) is connected to the rear side inner reinforcement plate (1) and the rear wheel cover (18), and the other end is connected to the rear wheel cover bracket (4) and the rear wheel cover (18); one end of the rear wheel cover bracket (4) is connected to the rear wheel cover inner reinforcement plate (3) and the rear wheel cover (18), and the other end is connected to the rear floor (13); the rear floor lower cross beam (12) is laid below the rear floor (13) and is located Below the rear wheel cover bracket (4), the rear floor cross beam (12) extends in the width direction of the vehicle body; it also includes two rear longitudinal beams (16); the two rear longitudinal beams (16) are laid below the rear floor (13); it also includes a rear wheel cover outer reinforcement plate (9), the rear wheel cover outer reinforcement plate (9) is located on the outer side of the rear wheel cover (18), one end of which is connected to the rear wheel cover (18), and the other end is connected to an end of the rear longitudinal beam (16) close to the rear floor cross beam (12); it also includes a rear spring tower seat support plate (10) and a rear spring tower seat (11); the rear spring tower seat support plate (10) is located at the connection between the rear longitudinal beam (16) and the rear floor cross beam (12), and is connected to one end of the rear wheel cover outer reinforcement plate (9); the rear spring tower seat (11) is connected to the outer side of the rear spring tower seat support plate (10).

2. A vehicle body rear structure according to claim 1, characterized in that: The rear floor (13) comprises a recess (14) for accommodating a spare tire, the opening of the recess facing the interior of the vehicle body, and the bottom of the rear wheel cover bracket (4) is close to the upper edge of the recess (14) of the rear floor (13).

3. A vehicle body rear structure according to claim 2, characterized in that: The two rear longitudinal beams (16) are laid on the sides of the recess (14) and are respectively vertically connected to the ends of the rear floor under-cross beam (12); the two rear longitudinal beams (16) and the rear floor under-cross beam (12) are arranged together around the recess (14).

4. A vehicle body rear structure according to claim 3, characterized in that: It also includes a battery mounting bracket (17), the battery mounting bracket (17) including an inner cavity box and a connecting plate located on one side of the inner cavity box, one end of the connecting plate is connected to the middle floor (8) and the rear floor (13), and the other end is connected to the rear longitudinal beam (16).

5. The rear vehicle body structure according to claim 3, characterized in that: It also includes a rear seat mounting reinforcement plate (15), which is located directly below the middle floor (8), one end of which is connected to the middle floor (8), and the other end of which is connected to the rear floor lower cross beam (12) and the rear floor (13).

6. The rear vehicle body structure according to claim 1, characterized in that: It also includes a rear wheel cover outer panel (7); the rear wheel cover outer panel (7) extends along the outer contour of the rear wheel cover (18); the rear wheel cover outer reinforcement plate (9) is connected to the rear wheel cover (18) and the rear wheel cover outer panel (7).

7. The rear vehicle body structure according to claim 6, characterized in that: It also includes a rear side outer reinforcement plate (5) and a D-pillar reinforcement plate (2); the rear side outer reinforcement plate (5) is located above the rear wheel housing outer plate (7), one end of which is connected to the upper part of the rear wheel housing outer plate (7) and the rear side inner reinforcement plate (1), and the other end is connected to the lower part of the rear side inner reinforcement plate (1); the D-pillar reinforcement plate (2) is located above the rear side outer reinforcement plate (5), one end of which is connected to the rear side outer reinforcement plate (5), and the other end is connected to the top cover crossbeam.

8. The rear vehicle body structure according to claim 7, characterized in that: It also includes a rear door lock reinforcement bracket (6), which is located at the lower part of the rear side outer reinforcement plate (5), one end of which is connected to the rear side outer reinforcement plate (5) and the other end of which is connected to the rear wheel housing outer plate (7).

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