A rear structure of an electric four-wheel drive vehicle and an electric vehicle

Abstract

This invention relates to the field of electric vehicle technology, and discloses a rear structure of an electric four-wheel drive vehicle and the electric vehicle itself. The rear floor body has longitudinal beams on both sides of its bottom, connected at their front ends by a first crossbeam of the rear floor. The two longitudinal beams are connected near their rear ends by a second crossbeam of the rear floor. A battery system and a CDU system are installed on the rear floor body, with the battery system located above the second crossbeam and the CDU system located in front of the battery system. This invention places the CDU system in front of the battery system, increasing the safe distance from the rear bumper and solving the problem of high-speed rear-end collision safety. By setting the second crossbeam of the rear floor, the overall modal stiffness performance of the rear floor structure is improved, and by placing the battery system above the second crossbeam, the modal performance of the battery is improved, further protecting the CDU system.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a rear structure of an electric four-wheel drive vehicle and the electric vehicle itself. Background Technology

[0002] The environmental pollution caused by traditional vehicle exhaust is becoming increasingly serious. To reduce air pollution, the development of plug-in hybrid electric vehicles (PHEVs) has been put on the agenda. Because PHEVs emit fewer pollutants during operation and have a smaller environmental impact compared to traditional vehicles, their prospects are widely viewed favorably. Four-wheel drive models are high-performance versions that meet users' demands for power. As competition in the automotive market intensifies, vehicle safety and quality are constantly improving to meet consumer needs. Safety is a fundamental performance requirement, and NVH (Noise, Vibration, and Harshness) is a crucial indicator of vehicle performance and an increasingly important factor for consumers when purchasing a car.

[0003] When upgrading plug-in hybrid vehicles based on traditional gasoline vehicle platforms, major manufacturers have not reserved space for the high-voltage electronic control system (CDU). Most consider placing it on the spacious rear floor. This arrangement raises concerns about electrical safety in high-speed rear-end collisions at 50 km / h, a mandatory testing standard under GB20072. Traditional gasoline vehicles rely on the rear energy-absorbing box and the deformation of the rear longitudinal beam to prevent fuel leaks. However, with the CDU located near the rear end of the rear floor, during a collision, the rear longitudinal beam deforms after being impacted by obstacle avoidance. The tailgate and rear panel, also impacted by obstacle avoidance, will be pushed forward against the CDU. Because the CDU is a high-voltage component, this poses a significant electrical safety risk.

[0004] One way to improve the overall NVH performance of a vehicle is to suppress the vibration of large sheet metal parts. The rear floor is one of the major sheet metal parts on the vehicle body, and in most models, the CDU, battery, PLC communication conversion module, and onboard tools are mounted on the rear floor. Therefore, the requirements for the rear floor are higher than for most sheet metal parts. First, the modal characteristics of the rear floor itself should be sufficiently high, exceeding the idle speed range, and avoiding the main excitation frequencies to prevent resonance. Additionally, the modal characteristics of the battery's large mass points also need to be ensured to avoid unnecessary cracking. Improving the overall NVH performance of a vehicle is crucial for enhancing ride comfort.

[0005] To ensure the safety performance of the rear floor unit (CDU) and improve the vehicle's NVH (noise, vibration, and harshness) performance, there are three common improvement methods: replacing the rear floor material, increasing the thickness of the rear floor material, or adding reinforcements around the spare tire well in the rear floor. These improvement methods also have significant drawbacks. Replacing the rear floor material increases the difficulty of the stamping process, while increasing the thickness of the rear floor material or adding reinforcements around the spare tire well in the rear floor increases the vehicle's weight and costs. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a rear structure for an electric four-wheel drive vehicle and an electric vehicle in which the CUD system is positioned in front of the battery system, increasing the safe distance from the rear bumper and solving the safety problem of high-speed electric shock at the rear. By setting a second crossbeam on the rear floor, the overall modal stiffness performance of the rear floor structure is improved, and the battery system is positioned above the second crossbeam on the rear floor, which improves the modal performance of the battery and further protects the CUD system.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] In a first aspect, a rear structure of an electric four-wheel drive vehicle includes a rear floor body, with longitudinal beams on both sides of the bottom of the rear floor body, the front ends of the longitudinal beams being connected by a first crossbeam of the rear floor; the two longitudinal beams are connected near the rear end by a second crossbeam of the rear floor to improve the modal performance of the rear floor body; a battery system and a CDU system are installed on the rear floor body, the battery system being located above the second crossbeam of the rear floor to improve the modal performance of the battery; the CDU system is located in front of the battery system to increase the distance from the rear enclosure.

[0009] As a further implementation, the rear floor body is provided with a battery mounting reinforcement plate, and the battery system is mounted on the battery mounting reinforcement plate.

[0010] As a further implementation, the rear floor body is provided with a CDU mounting plate, which is staggered from the battery mounting reinforcement plate, and the rear end of the CDU mounting plate near the battery system overlaps with the front end of the battery mounting reinforcement plate.

[0011] As a further implementation, the CDU system is mounted on the front end of the CDU mounting plate via a CDU bracket, and a PLC communication conversion module is installed at the rear end of the CDU mounting plate; the CDU system is located between the first crossbeam and the second crossbeam of the rear floor.

[0012] As a further implementation, both ends of the first and second crossbeams of the rear floor are connected to the longitudinal beams via connecting plates.

[0013] As a further implementation, several reinforcing ribs are arranged on the rear floor body on the rear side of the second crossbeam of the rear floor, on both sides of the battery system and the CDU system.

[0014] As a further implementation, the CDU mounting plate and the battery mounting reinforcement plate are provided with reinforcing ribs, and the overlap of the CDU mounting plate and the battery mounting reinforcement plate is provided with a welding surface, which together form a three-layer weld with the rear floor body.

[0015] As a further implementation, the front end of the rear floor body is connected to the middle floor body, the rear end is connected to the rear outer panel, and the two sides of the rear end are connected to the rear floor connecting plate.

[0016] As a further implementation, the battery system is located at the middle position above the second crossbeam of the rear floor.

[0017] Secondly, an electric vehicle is provided, the electric vehicle being equipped with the rear structure of an electric four-wheel drive vehicle as described above; a battery system is located above the second crossbeam of the rear floor to improve battery modal performance; and a CDU system is located in front of the battery system to increase the distance from the rear enclosure.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. This invention places the CUD system in front of the battery system, increasing the safe distance from the rear enclosure and solving the safety problem of high-speed electric shock at the rear. By setting a second crossbeam on the rear floor, the overall modal stiffness performance of the rear floor structure is improved, and the battery system is placed above the second crossbeam on the rear floor, which improves the modal performance of the battery and further protects the CUD system.

[0020] 2. The present invention can achieve a suitable reduction in the thickness of the rear floor body by setting the second crossbeam of the rear floor, thus achieving weight reduction. The rear floor body is provided with a reinforcing rib structure, which can reduce the local stress concentration caused by the installation of accessories, thereby reducing the risk of sheet metal fatigue cracking; at the same time, it can also reduce transmission force, reduce idling vibration noise, improve vehicle NVH performance, and improve ride comfort.

[0021] 3. In this invention, the CDU mounting plate and the battery mounting reinforcement plate overlap and are welded to form an integrated structure. The overlap is welded to the rear floor body to form a three-layer welded structure, which can realize the integrity of the rear floor body and the structure on the body. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the rear structure of an electric four-wheel drive vehicle in an embodiment of the present invention;

[0024] Figure 2 This is a partial schematic diagram of the rear structure of an electric four-wheel drive vehicle in an embodiment of the present invention;

[0025] Figure 3 This is an exploded view of the rear structure of the electric four-wheel drive vehicle in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the bottom surface of the rear structure of an electric four-wheel drive vehicle in an embodiment of the present invention;

[0027] Figure 5 This is a top view of the rear structure of the electric four-wheel drive vehicle in an embodiment of the present invention;

[0028] Figure 6 yes Figure 5 Schematic diagram of the AA section;

[0029] Figure 7 yes Figure 5 Schematic diagram of the BB section;

[0030] Figure 8 This is a schematic diagram of the four-sided connection of the rear structure of the electric four-wheel drive vehicle in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the overall structure of the rear floor body in an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the battery mounting reinforcement plate in an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the CDU mounting plate in an embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram of the structure of the second crossbeam of the rear floor in an embodiment of the present invention.

[0035] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0036] The components include: 1. CDU system; 5. CDU mounting plate; 6. CDU bracket; 2. PLC communication conversion module;

[0037] 3. Battery system; 7. Battery mounting reinforcement plate; 4. Rear floor body;

[0038] 8. Right connecting plate of the second crossbeam; 9. Second crossbeam of the rear floor; 10. Left connecting plate of the second crossbeam;

[0039] 11. Right connecting plate of the first crossbeam; 12. First crossbeam of the rear floor; 13. Left connecting plate of the first crossbeam;

[0040] 14. Right rear longitudinal beam; 15. Left rear longitudinal beam; 16. Middle floor body; 17. Right rear connecting plate of the rear floor; 18. Rear outer panel; 19. Left rear connecting plate of the rear floor. Detailed Implementation

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] Example 1

[0043] In a typical embodiment of the present invention, reference is made to Figures 1-12 As shown, the rear structure of an electric four-wheel drive vehicle includes a rear floor body 4. Longitudinal beams are provided on both sides of the bottom of the rear floor body 4, and the front ends of the longitudinal beams are connected by a first crossbeam 12 of the rear floor. The two longitudinal beams are connected near the rear end by a second crossbeam 9 of the rear floor to improve the modal performance of the rear floor body 4. A battery system 3 and a CDU system 1 are installed on the rear floor body 4. The battery system 3 is located above the second crossbeam 9 of the rear floor to improve the modal performance of the battery. The CDU system 1 is located in front of the battery system 3 to increase the distance between it and the rear bumper.

[0044] like Figure 4 As shown, the bottom surface of the rear floor plate body 4 is provided with two longitudinal beams and two transverse beams. The longitudinal beams include a right rear longitudinal beam 14 and a left rear longitudinal beam 15, which are welded and fixed to both sides of the bottom of the rear floor plate body 4. The front ends of the two longitudinal beams are connected by the first transverse beam 12 of the rear floor. On this basis, the two longitudinal beams are connected near the rear end by the second transverse beam 9 of the rear floor. This makes the two longitudinal beams and two transverse beams form a frame structure, and both the transverse beams and longitudinal beams are fixedly connected to the bottom surface of the rear floor plate body, which improves the modal performance of the rear floor body. The thickness of the rear floor body does not need to be increased. Furthermore, by setting a reinforcing rib structure on the rear floor body 4, the thickness of the rear floor body 4 can be appropriately reduced while ensuring the modal performance of the rear floor body 4, thus achieving lightweighting of the rear floor body 4 while ensuring the strength of the rear floor.

[0045] like Figure 3 As shown, both ends of the first crossbeam 12 and the second crossbeam 9 of the rear floor are connected to the longitudinal beams via connecting plates. Specifically, both ends of the first crossbeam 12 are connected to the corresponding longitudinal beams via the right connecting plate 11 and the left connecting plate 13, respectively. Both ends of the second crossbeam 9 are connected to the corresponding longitudinal beams via the right connecting plate 8 and the left connecting plate 10, respectively.

[0046] like Figure 8 As shown, the rear floor body 4 is connected to the middle floor body 16 at the front end, the rear outer panel 18 at the rear end, and the left and right rear connecting plates 19 and 17 respectively at the rear ends. The above structure of the rear floor body is connected to the surrounding area, which is existing technology.

[0047] like Figure 1 and Figure 2As shown, the rear floor body 4 is equipped with a PLC communication conversion module 2, a battery system 3, and a CDU system 1. The CDU system 1 and the PLC communication conversion module 2 are mounted on the rear floor body 4 via a CDU mounting plate, and the battery system 3 is mounted on the rear floor body 4 via a battery mounting reinforcement plate 7.

[0048] like Figure 2 and Figure 5 As shown, a CDU mounting plate 5 is provided on the rear floor body 4. The CDU mounting plate 5 is staggered from the battery mounting reinforcement plate 7. The rear end of the CDU mounting plate 5, near the battery system 3, overlaps with the front end of the battery mounting reinforcement plate 7. The overlap between the CDU mounting plate 5 and the battery mounting reinforcement plate 7 has a welding surface, which together form a three-layer weld with the rear floor body 4.

[0049] CDU system 1 is mounted on the front end of CDU mounting plate 5 via CDU bracket 6. PLC communication conversion module 2 is mounted on the rear end of CDU mounting plate 5. The specific installation locations are as follows: Figure 1 As shown, the PLC communication conversion module 2 is located at the front end of the battery system 3, close to the CDU system 1. The CDU system 1 and the PLC communication conversion module 2 are arranged along the length of the CDU mounting plate 5, and the length of the CDU mounting plate 5 is in the same direction as the front-rear direction of the rear floor body.

[0050] like Figure 2 As shown, the battery mounting reinforcement plate 7 is fixedly connected to the rear floor body 4, and is installed in the middle position above the second crossbeam 9 of the rear floor, so that the battery system 3 is located in the middle position above the second crossbeam of the rear floor. With the support of the second crossbeam 9 of the rear floor, not only is the modal performance of the rear floor body improved, but the modal performance of the battery is also further improved.

[0051] like Figure 1 and Figure 2 As shown, the CDU system 1 is located between the first crossbeam 12 and the second crossbeam 9 of the rear floor. The CDU system 1 is positioned in front of the battery system 3, increasing the distance between the CDU system and the rear bumper, thus addressing the safety issue of high-speed rear-end electric shock. Furthermore, the battery system 3 is equipped with the second crossbeam 9 of the rear floor, further ensuring the safety of the front-side CDU system 1 and improving the vehicle's NVH performance.

[0052] While achieving a lightweight rear floor body, several reinforcing ribs are incorporated into the rear floor body to ensure its strength, reduce local stress concentration in the accessory mounting structure, and lower the risk of sheet metal fatigue cracking. Specifically, several reinforcing ribs are arranged on the rear side of the second crossbeam 9 and on both sides of the rear floor body of the battery system 3 and CDU system 1. The addition of these reinforcing ribs further protects the battery system 3 and CDU system. Furthermore, reinforcing ribs are also arranged on the CDU mounting plate 5 and the battery mounting reinforcing plate 7 to improve their strength.

[0053] like Figure 6 and Figure 7 As shown, the front end of the CDU mounting plate 5 is higher than the rear end. The front end is used for the installation of the CDU bracket 6. The shape of the CDU bracket 6 is adapted to the shape of the front end of the CDU mounting plate 5. The rear end of the CDU mounting plate 5 is lower, so as to overlap with the battery mounting reinforcement plate 7.

[0054] like Figure 9 As shown, the rear floor body 4 is provided with a seat belt mounting hole 4a, a seat mounting hole 4b, a positioning through hole 4c, a positioning hole 4d, a high-voltage line mounting hole 4e, a wheel speed sensor mounting hole 4f, a water pipe mounting hole 4g, a leakage hole 4h, a battery vent mounting hole 4i, a wiring harness mounting hole 4j, a guard plate mounting hole 4k, welding surfaces 4l and 4m that overlap with the surrounding area, and reinforcing ribs 4n.

[0055] The seat belt mounting hole 4a is located at the middle of the front end of the rear floor body 4 and is used for installing the seat belt structure.

[0056] Seat mounting holes 4b are located at the front end of the rear floor body 4 and are used to install the seat.

[0057] Positioning holes 4c are located on both sides of the rear floor body 4, and positioning holes 4d are located at the rear end, used to achieve positioning and installation of the rear floor body 4.

[0058] The high-voltage line mounting hole 4e is located on one side of the CDU system and is used for the passage of the high-voltage line in the electrical structure.

[0059] The wheel speed sensor mounting hole 4f is located near the high-voltage line mounting hole 4e and is used to mount the wheel speed sensor.

[0060] The water pipe mounting hole 4g ​​is located on the rear side of the CDU mounting plate 5 away from the battery mounting reinforcement plate 7, for the water pipe to pass through.

[0061] The leakage hole 4h is located near the rear end of the battery mounting reinforcement plate 7, which is existing technology.

[0062] The battery vent mounting hole 4i is located at the position of the battery mounting reinforcement plate 7, and its purpose is to achieve venting and heat dissipation of the battery system.

[0063] The wiring harness mounting hole 4j is located near the battery vent mounting hole 4i for arranging the corresponding wiring harness.

[0064] The guard plate mounting holes 4k are located on both sides of the rear floor body 4 and are used to install the guard plate to improve safety.

[0065] The welding surface 4l is located at the edge of the rear floor body 4, with the purpose of achieving a fixed connection between the rear floor body 4 and the surrounding structure.

[0066] The mounting point 4m of the combined motor (motor, motor controller, and gearbox) is designed to facilitate the installation of the corresponding structure. Reinforcing ribs 4n are preferably located at the rear end of the rear floor body 4, on both sides of the battery mounting reinforcement plate 7 and the CDU mounting plate, and at the front end of the rear floor body 4, to enhance the strength of the rear floor body 4.

[0067] By optimizing the overall shape of the rear floor structure and setting reasonable reinforcing ribs 4n, the local structural features of the rear floor were improved. This not only improved the overall modal stiffness performance of the rear floor structure, but also reduced the local stress concentration of the accessory installation structure and reduced the risk of sheet metal fatigue cracking.

[0068] like Figure 10 As shown, the structure of the battery mounting reinforcement plate 7 includes: battery mounting nut hole 7a, positioning hole 7b, wire harness mounting hole 7c, battery mounting mating surface 7d, welding surface 7e, and reinforcing rib 7f. This structure improves the modal performance of the battery system through proper bonding and arrangement.

[0069] The battery mounting nut holes 7a are located at the front and rear ends of the battery mounting reinforcement plate 7, with two holes at each end. They are used to secure the battery mounting reinforcement plate 7 to the rear floor.

[0070] The positioning hole 7b is located between the two battery mounting nut holes 7a at each end and is used for mounting and positioning.

[0071] The wiring harness mounting hole 7c is located at the front end of the battery mounting reinforcement plate 7 and is used to install the corresponding wiring harness.

[0072] The battery mounting mating surface 7d is located on the main body of the top surface of the battery mounting reinforcement plate 7, serving as the mounting surface of the battery system 3.

[0073] Welding surfaces 7e are located at the four corners and are used for welding and fixing to the rear floor body. One welding surface 7e on the front side is used for overlapping welding with the CDU mounting plate, and a reinforcing rib 7f is provided here to improve strength.

[0074] like Figure 11As shown, the CDU mounting plate 5 is used to connect the battery mounting reinforcement plate 7 and the CDU bracket 6 to form a whole. It can also mount the PLC communication conversion module 2 on its own, making it a connecting component. The specific features of this structure include positioning hole 5a, leakage hole 5b, CDU mounting bracket matching surface 5c, CDU bracket mounting hole 5d, PLC communication conversion module mounting matching surface 5e, PLC communication conversion module mounting hole 5f, welding surface 5g, and reinforcing rib 5h, which improves the overall modality of the rear structure.

[0075] Positioning holes 5a are located at the front and rear ends and are used to position and install the CDU mounting plate 5.

[0076] The leakage hole 5b is located at the rear end. After installation, the PLC communication conversion module should be installed directly above this position on the floor body.

[0077] CDU mounting bracket mating surface 5c is located on the front main body to mate with the CDU mounting bracket.

[0078] CDU bracket mounting hole 5d is located on CDU mounting bracket mating surface 5c, for installing CDU mounting bracket.

[0079] The PLC communication conversion module is mounted on the mating surface 5e, located around the leakage hole 5b, and a PLC communication conversion module mounting hole 5f is provided to enable the installation of the PLC communication conversion module.

[0080] The welding surface 5g is located at the rear end of the CDU mounting plate 5, near the battery mounting reinforcement plate 7, and is used for lap welding with the welding surface at the reinforcing rib 7f. The reinforcing rib 5h is arranged along the front end of the CDU mounting plate 5 to improve strength.

[0081] like Figure 12 As shown, the second crossbeam right connecting plate 8, the rear floor second crossbeam 9, and the second crossbeam left connecting plate 10 are connected in sequence: this structural assembly improves the modal performance of the rear floor body 4.

[0082] The right connecting plate 8 of the second crossbeam includes a positioning hole 8a, a leakage hole 8b, and a wire harness mounting hole 8c, which are used for positioning, leakage, and wire harness installation. This is existing technology, and technicians can set it up according to specific circumstances.

[0083] The second crossbeam 9 of the rear floor includes positioning holes 8a, leakage holes 9b, wire harness mounting holes 9c, and reinforcing ribs 9d, which are also existing technologies. The reinforcing ribs 9d can be set as needed to improve the overall strength of the second crossbeam, thereby indirectly improving the modal performance of the rear floor body 4.

[0084] This embodiment improves the modal performance of the rear floor body by setting a second crossbeam of the rear floor, which, together with the longitudinal beams and the first crossbeam of the rear floor, forms a frame structure, thus solving the problem of substandard modal performance of the rear floor body. Based on this, the battery system is installed in the middle position directly above the second crossbeam of the rear floor, and the battery modal performance problem is solved by the support of the second crossbeam. The CUD system 1 is arranged in front of the battery system 3, increasing the safe distance from the rear enclosure and solving the problem of high-speed rear-end collision safety. This approach not only meets the requirement of preventing CDU compression in a 50km / h rear-end high-speed collision according to GB20072 by controlling the rear deformation position, but also minimizes weight while avoiding electrical safety risks.

[0085] Example 2

[0086] In a typical embodiment of the present invention, reference is made to Figures 1-12 As shown, an electric vehicle is provided, with the rear structure of an electric four-wheel drive vehicle as described in Embodiment 1.

[0087] The inclusion of the second crossbeam in the rear floor improves the overall modal stiffness performance of the rear floor structure and reduces local stress concentration caused by accessory installation, thereby reducing the risk of sheet metal fatigue cracking. Based on this, the thickness of the rear floor body can be appropriately reduced to achieve lightweighting. The rear floor body 4 and the second crossbeam assembly together achieve the required modal performance targets for the rear floor. Analysis shows that the rear structural strength meets the requirements, with a local modal improvement of approximately 47.3% and a battery modal improvement of approximately 29.1%. This improvement in modal performance avoids abnormal noises caused by insufficient modal stiffness, reduces transmission function, reduces idling vibration noise, improves vehicle NVH performance, and enhances ride comfort.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rear structure of an electric four-wheel drive vehicle, characterized in that, The rear floor body includes a rear floor unit with longitudinal beams on both sides of its bottom. The front ends of the longitudinal beams are connected by a first crossbeam of the rear floor. The two longitudinal beams are connected near the rear end by a second crossbeam of the rear floor to improve the modal performance of the rear floor unit. The battery system and CDU system are installed on the rear floor unit. The battery system is located above the second crossbeam of the rear floor to improve the modal performance of the battery. The CDU system is located in front of the battery system to increase the distance between it and the rear enclosure. The rear floor body is provided with a battery mounting reinforcement plate, on which the battery system is mounted; the rear floor body is provided with a CDU mounting plate, which is staggered from the battery mounting reinforcement plate, with the rear end of the CDU mounting plate near the battery system overlapping the front end of the battery mounting reinforcement plate; the CDU system is mounted on the front end of the CDU mounting plate via a CDU bracket, and a PLC communication conversion module is installed at the rear end of the CDU mounting plate; the CDU system is located between the first and second crossbeams of the rear floor; reinforcing ribs are arranged on the CDU mounting plate and the battery mounting reinforcement plate, and a welding surface is provided at the overlap of the CDU mounting plate and the battery mounting reinforcement plate, forming a three-layer weld with the rear floor body.

2. The rear structure of an electric four-wheel drive vehicle according to claim 1, characterized in that, Both ends of the first and second crossbeams of the rear floor are connected to the longitudinal beams via connecting plates.

3. The rear structure of an electric four-wheel drive vehicle according to claim 1, characterized in that, Several reinforcing ribs are arranged on the rear floor body on the rear side of the second crossbeam of the rear floor and on both sides of the battery system and CDU system.

4. The rear structure of an electric four-wheel drive vehicle according to claim 1, characterized in that, The rear floor body is connected to the middle floor body at the front end, the rear outer panel at the rear end, and the rear floor connecting plates on both sides at the rear end.

5. The rear structure of an electric four-wheel drive vehicle according to claim 1, characterized in that, The battery system is located in the middle position above the second crossbeam of the rear floor.

6. An electric vehicle, characterized in that, The electric vehicle is equipped with the rear structure of an electric four-wheel drive vehicle as described in any one of claims 1-5.

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