Back door assembly and vehicle

Abstract

The utility model discloses a back door assembly and a vehicle, the back door assembly comprises a back door body, a reinforcing structure, a hinge reinforcing plate and a spare tire mounting plate; the reinforcing structure, the hinge reinforcing plate and the spare tire mounting plate are all arranged on the back door body; wherein the reinforcing structure is connected with the hinge reinforcing plate, and at least part of the reinforcing structure is connected with the spare tire mounting plate. Therefore, one part of force transmitted from the spare tire mounting plate to the hinge of the back door is borne by the hinge reinforcing plate, and the other part of force is borne by the reinforcing structure, so that a force transmission path at the hinge of the back door is optimized and expanded, the rigidity at the hinge of the back door is enhanced, and the risk of breakage at the hinge and the deformation of the back door are reduced.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a tailgate assembly and a vehicle. Background Art

[0002] With the rapid development of the automobile manufacturing industry, consumers are increasingly demanding vehicle performance. While pursuing lightweight design and long-lasting endurance to reduce costs and increase efficiency, the high structural strength and stability of the vehicle body frame are the fundamental guarantee for safe driving. As an important external covering system of the vehicle body frame, the tailgate plays an important role in protecting the driver's personal and property safety. Of the two common types of tailgate opening, the side-lift tailgate is more labor-saving and simpler than the top-lift tailgate, and is often used in off-road vehicle configurations. However, as a carrier for the spare tire or toolbox, the hinge of the side-lift tailgate often bears greater loads and torque.

[0003] In the related art, due to the unreasonable design of the tailgate structure, the hinge connecting the tailgate and the vehicle body is prone to breakage, which causes the tailgate to sink, deform, and other problems. Utility Model Content

[0004] The present application aims to provide a tailgate assembly and a vehicle that can solve the problem of easy breakage at the hinge in the related art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application proposes a tailgate assembly, comprising a tailgate body, a reinforcement structure, a hinge reinforcement plate and a spare tire mounting plate; the reinforcement structure, the hinge reinforcement plate and the spare tire mounting plate are all arranged on the tailgate body; wherein the reinforcement structure is connected to the hinge reinforcement plate and is at least partially connected to the spare tire mounting plate.

[0007] Optionally, the reinforcement structure includes a structural body and a first extension portion; the structural body is connected

[0008] On the hinge reinforcement plate, the first extension portion is connected to the structural body, and at least a portion of the first extension portion is connected to the back door body.

[0009] Optionally, the first extension portion extends from the structural body to the spare tire mounting plate.

[0010] Optionally, a groove is formed at the connection between the spare tire mounting plate and the tailgate body, and the first extension portion extends to the groove and is connected to the spare tire mounting plate.

[0011] Optionally, the reinforcement structure further includes a second extension portion; the second extension portion is connected to the structural body, and the second extension portion is at least partially connected to the back door body.

[0012] Optionally, the second extension portion extends from the structural body to the spare tire mounting plate.

[0013] Optionally, the second extension portion extends to a connection point between the spare tire mounting plate and the tailgate body and is connected to the spare tire mounting plate.

[0014] Optionally, the structural body and the second extension portion are an integrally formed part.

[0015] Optionally, it further includes a window frame reinforcement plate; the window frame reinforcement plate is connected to the hinge reinforcement plate, and the reinforcement structure further includes a third extension portion, the third extension portion is connected to the structural body, and the third extension portion is at least partially connected to the window frame reinforcement plate.

[0016] Optionally, the back door body includes a back door inner panel and a back door outer panel, a cavity structure is formed between the back door inner panel and the back door outer panel, the reinforcement structure is arranged in the cavity structure, and the reinforcement structure matches the shape of the cavity structure.

[0017] Optionally, the reinforcement structure includes at least one welding portion; the welding portion is welded to at least one of the tailgate inner panel and the hinge reinforcement plate.

[0018] Optionally, the reinforcement structure is an integrated air pressure thermoformed structure.

[0019] Optionally, a reinforcement layer is further included; the reinforcement layer is arranged between the reinforcement structure and the hinge reinforcement plate; and / or the reinforcement layer is arranged between the reinforcement structure and the back door body.

[0020] Optionally, the reinforcement structure at least partially has a hollow structure.

[0021] In a second aspect, an embodiment of the present application proposes a vehicle comprising the tailgate assembly described in the above embodiment.

[0022] In the embodiment of the present application, the reinforcement structure is connected to the hinge reinforcement plate and at least partially connected to the spare tire mounting plate. In this way, part of the force transmitted from the spare tire mounting plate to the tailgate hinge is transmitted by the hinge.

[0023] The reinforcement plate bears part of the force, and the other part is borne by the reinforced structure, so that the force transmission path at the tailgate hinge is optimized and expanded, the rigidity of the tailgate hinge is enhanced, and the risk of fracture at the hinge and deformation of the tailgate are reduced.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic diagram of a reinforcement structure according to an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of a back door assembly according to an embodiment of the present application;

[0028] Figure 3 is a partial enlarged view of a back door assembly according to an embodiment of the present application;

[0029] Figure 4 Schematic diagram of the force transmission path of the tailgate assembly according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 1-first crossbeam; 2-second crossbeam; 3-hinge reinforcement plate; 4-spare tire mounting plate; 5-reinforcement structure; 51-structural body; 52-first extension portion; 53-second extension portion; 54-third extension portion; 55-welding portion; 6-groove; 7-window frame reinforcement plate; 8-back door inner panel. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, the terms "and" in the description and claims may include one or more of the features.

[0034] / or" indicates at least one of the connected objects. The character " / " generally indicates that the previous and next related objects are in an "or" relationship.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] The tailgate assembly and vehicle provided in the embodiments of the present application are described in detail below with reference to specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0038] First, as Figures 1 to 4 As shown, an embodiment of the present application proposes a tailgate assembly, including a tailgate body, a reinforcement structure 5, a hinge reinforcement plate 3 and a spare tire mounting plate 4; the reinforcement structure 5, the hinge reinforcement plate 3 and the spare tire mounting plate 4 are all arranged on the tailgate body; wherein, the reinforcement structure 5 is connected to the hinge reinforcement plate 3 and is at least partially connected to the spare tire mounting plate 4.

[0039] In the embodiment of the present application, the reinforcement structure 5 is connected to the hinge reinforcement plate 3 and at least partially connected to the spare tire mounting plate 4. In this way, part of the force transmitted from the spare tire mounting plate 4 to the tailgate hinge is borne by the hinge reinforcement plate 3, and the other part is borne by the reinforcement structure 5. This optimizes and expands the force transmission path at the tailgate hinge, enhances the rigidity of the tailgate hinge, and reduces the risk of hinge fracture and tailgate deformation.

[0040] In some embodiments, as Figure 2 As shown, the back door body includes a back door inner plate 8, a back door outer plate (Figure

[0041] The first crossbeam 1 and the second crossbeam 2 are spaced apart and arranged on the back door inner panel 8. The two ends of the first crossbeam 1 and the second crossbeam 2 are connected to the spare tire mounting plate 4 and the hinge reinforcement plate 3 respectively. The reinforcement structure 5 is partially arranged on the first crossbeam 1 and the second crossbeam 2. In this way, the following is formed: Figure 4 The new force transmission path is shown.

[0042] Specifically, the original transmission path is as follows: the force applied to the spare tire mounting plate 4 is transmitted to the hinge reinforcement plate 3 through the first crossbeam 1 and the second crossbeam 2, and the hinge reinforcement plate 3 then transmits the force to the tailgate inner panel 8. As a result, the hinge reinforcement plate 3 has to bear most of the force applied to the spare tire mounting plate 4, which makes the hinge reinforcement plate 3 prone to breakage.

[0043] The present application incorporates a reinforcement structure 5 at the hinge reinforcement plate 3, at least partially connected to the spare tire mounting plate 4. This allows forces acting on the spare tire mounting plate 4 to be transmitted to the hinge reinforcement plate 3 via the reinforcement structure 5. Because the reinforcement structure 5 itself can absorb some of the forces acting on the spare tire mounting plate 4, the reinforcement structure 5 optimizes and expands the force transmission path of the tailgate assembly, enhancing its rigidity and distributing the forces.

[0044] Alternatively, as Figure 1 and Figure 2 As shown, the reinforcement structure 5 includes a structural body 51 and a first extension portion 52; the structural body 51 is connected to the hinge reinforcement plate 3, the first extension portion 52 is connected to the structural body 51, and the first extension portion 52 is at least partially connected to the back door body.

[0045] In this embodiment of the present application, the structural body 51 is connected to the hinge reinforcement plate 3, and the first extension 52 is connected to the structural body 51. The first extension 52 is at least partially connected to the tailgate body. In this way, the force applied to the spare tire mounting plate 4 is transmitted to the structural body 51 through the first extension 52, allowing the structural body 51 to bear part of the force applied to the spare tire mounting plate 4, thereby reducing the force applied to the hinge reinforcement plate 3.

[0046] Specifically, if Figure 1 and Figure 2 As shown, the first extension portion 52 is connected to the structural body 51 by bolts. A mounting hole is provided on the first extension portion 52. The fastener can pass through the mounting hole to be bolted to the first crossbeam 1 or the tailgate inner panel 8, thereby enhancing the connection strength between the first extension portion 52 and the first crossbeam 1 or the tailgate inner panel 8.

[0047] Alternatively, as Figure 2 As shown, the first extension portion 52 extends from the structural body 51 to the spare tire mounting plate 4 .

[0048] In the embodiment of the present application, the first extension portion 52 is provided to extend from the structural body 51 to the spare tire mounting plate 4. In this way, the connectivity between the spare tire mounting plate 4 and the structural body 51 is optimized, so that the spare tire

[0049] The force applied to the mounting plate 4 is directly transmitted to the structural body 51 through the first extension portion 52 .

[0050] Alternatively, as Figure 2 and Figure 3 As shown, a groove 6 is formed at the connection between the spare tire mounting plate 4 and the tailgate body, and the first extension portion 52 extends to the groove 6 and is connected to the spare tire mounting plate 4 .

[0051] Specifically, if Figure 3 As shown, the upper end of the spare tire mounting plate 4 is connected to the back door inner panel 8 , and a groove 6 is formed at the connection between the spare tire mounting plate 4 and the back door inner panel 8 on one side close to the hinge reinforcement plate 3 .

[0052] In the embodiment of the present application, a groove 6 is provided at the connection between the spare tire mounting plate 4 and the tailgate body, and the first extension portion 52 extends to the groove 6 and is connected to the spare tire mounting plate 4. In this way, the existing groove 6 is utilized to connect with the first extension portion 52, thereby improving the compactness of the structural layout.

[0053] Alternatively, as Figures 1 to 3 As shown, the reinforcement structure 5 further includes a second extension portion 53 ; the second extension portion 53 is connected to the structural body 51 , and the second extension portion 53 is at least partially connected to the back door body.

[0054] In this embodiment of the present application, by connecting the second extension portion 53 to the structural body 51, the second extension portion 53 is at least partially connected to the tailgate body. Thus, the force applied to the spare tire mounting plate 4 is transmitted to the structural body 51 via the second extension portion 53, allowing the structural body 51 to bear part of the force applied to the spare tire mounting plate 4, thereby reducing the force applied to the hinge reinforcement plate 3.

[0055] Specifically, if Figure 1 and Figure 2 As shown, the second extension portion 53 is connected to the structural body 51 by bolts. A mounting hole is provided on the second extension portion 53. The fastener can pass through the mounting hole to be bolted to the second crossbeam 2 or the tailgate inner panel 8, thereby enhancing the connection strength between the second extension portion 53 and the second crossbeam 2 or the tailgate inner panel 8.

[0056] It should be noted that the second extension portion 53 can also be provided at the same time as the first extension portion 52. In this way, the force of the spare tire mounting plate 4 can be simultaneously transmitted to the structural body 51 through the second extension portion 53 and the first extension portion 52, thereby dispersing the force on the structural body 51 and overcoming deformation of the structural body 51 caused by concentrated force.

[0057] Alternatively, as Figure 2 As shown, the second extension portion 53 extends from the structural body 51 to the spare tire mounting plate 4 .

[0058] In the embodiment of the present application, the second extension portion 53 is provided to extend from the structural body 51 to the spare tire mounting plate 4. In this way, the connectivity between the spare tire mounting plate 4 and the structural body 51 is optimized, so that the force applied to the spare tire mounting plate 4 is directly transmitted to the structural body 51 through the first extension portion 52.

[0059] Alternatively, as Figure 2 and Figure 3 As shown, the second extension portion 53 extends to the spare tire mounting plate 4 and the back door body.

[0060] The connection point of the body is connected to the spare tire mounting plate 4.

[0061] In the embodiment of the present application, the second extension portion 53 extends to the connection between the spare tire mounting plate 4 and the back door body and is connected to the spare tire mounting plate 4. In this way, the second extension portion 53 is directly connected to the connection between the spare tire mounting plate 4 and the back door body, thereby improving the compactness of the structural layout.

[0062] Specifically, if Figure 3 As shown, the spare tire mounting plate 4 is provided on the second cross beam 2 , the connection between the spare tire mounting plate 4 and the tailgate body is the connection between the spare tire mounting plate 4 and the second cross beam 2 , and the second extension portion 53 is connected to the spare tire mounting plate 4 via fasteners.

[0063] Alternatively, as Figure 1 As shown, the structural body 51 and the second extension portion 53 are an integrally formed part.

[0064] In the embodiment of the present application, the structural body 51 and the second extension portion 53 are formed as an integral part, so as to enhance the connection strength between the structural body 51 and the second extension portion 53, thereby enabling the second extension portion 53 to transmit greater force.

[0065] Alternatively, as Figure 2 As shown, it also includes a window frame reinforcement plate 7; the window frame reinforcement plate 7 is connected to the hinge reinforcement plate 3, and the reinforcement structure 5 also includes a third extension portion 54, the third extension portion 54 is connected to the structural body 51, and the third extension portion 54 is at least partially connected to the window frame reinforcement plate 7.

[0066] In the embodiment of the present application, by connecting the window frame reinforcement plate 7 to the hinge reinforcement plate 3, the reinforcement structure 5 further includes a third extension portion 54, which is connected to the structural body 51 and at least partially connected to the window frame reinforcement plate 7. In this way, the force applied to the structural body 51 can be transmitted to the window frame reinforcement plate 7 via the third extension portion 54, thereby optimizing the force applied to the structural body 51.

[0067] Alternatively, as Figure 2 and Figure 3 As shown, the tailgate body includes a tailgate inner panel 8 and a tailgate outer panel, a cavity structure is formed between the tailgate inner panel 8 and the tailgate outer panel, and the reinforcement structure 5 is arranged in the cavity structure, and the reinforcement structure 5 matches the shape of the cavity structure.

[0068] In the embodiment of the present application, a cavity structure is formed between the back door inner panel 8 and the back door outer panel, and the reinforcement structure 5 is disposed in the cavity structure. The reinforcement structure 5 conforms to the shape of the cavity structure. In this way, the cavity structure formed between the back door inner panel 8 and the back door outer panel is filled by the reinforcement structure 5, thereby enhancing the torsional stiffness between the back door inner panel 8 and the back door outer panel, and reducing the possibility of plastic deformation and cracking of the back door inner panel 8 and the back door outer panel.

[0069] Specifically, the tailgate inner panel 8 faces the vehicle's passenger compartment, while the tailgate outer panel (not shown) faces away from the vehicle's passenger compartment. The reinforcement structure 5, hinge reinforcement plate 3, and spare tire mounting plate 4 are all positioned between the tailgate inner panel 8 and the outer panel. A cavity is formed between the tailgate inner panel 8 and the outer panel at the hinge reinforcement plate 3. The reinforcement structure 5 fills the cavity corresponding to the hinge reinforcement plate 3, thereby increasing the force transmission path and enhancing the torsional stiffness of the cavity corresponding to the hinge reinforcement plate 3.

[0070] In some embodiments, the reinforcement structure 5 is an irregular flat tubular structure, which is adapted to the cavity structure corresponding to the hinge reinforcement plate 3 .

[0071] Alternatively, as Figures 1 to 3 As shown, the reinforcement structure 5 includes at least one welding portion 55 ; the welding portion 55 is welded to at least one of the back door inner panel 8 and the hinge reinforcement plate 3 .

[0072] In the embodiment of the present application, the welding portion 55 is welded to at least one of the back door inner panel 8 and the hinge reinforcement plate 3. In this way, the connection strength between the reinforcement structure 5 and the hinge reinforcement plate 3 and the back door inner panel 8 is improved.

[0073] In some embodiments, a welding portion 55 is provided in the middle portion of the structural body 51, the left side of the welding portion 55 is welded to the hinge reinforcement plate 3, and the right side of the welding portion 55 is welded to the tailgate inner panel 8; of course, the left side of the welding portion 55 can also be welded to the hinge reinforcement plate 3 and the tailgate inner panel 8 at the same time.

[0074] Optionally, the reinforcement structure 5 is an integrated air pressure thermoformed structure.

[0075] In the embodiment of the present application, the reinforcement structure 5 is configured as an integrated air pressure thermoforming structure, so as to facilitate the processing of the reinforcement structure 5, reduce costs, and improve adaptability.

[0076] In some embodiments, the reinforcement structure 5 of the present application is designed as a "dagger-like" structure. The reinforcement structure 5 as a whole adopts an integrated air pressure thermoforming processing technology. According to the differences in the cavity structures corresponding to the hinge reinforcement plates 3 in different tailgate assemblies, the mold is flexibly designed to achieve the forming of the reinforcement structure 5; therefore, the present application also has high adaptability and promotion.

[0077] Optionally, a reinforcement layer is further included; the reinforcement layer is arranged between the reinforcement structure 5 and the hinge reinforcement plate 3; and / or the reinforcement layer is arranged between the reinforcement structure 5 and the back door body.

[0078] In the embodiment of the present application, the reinforcement layer is provided between the reinforcement structure 5 and the hinge reinforcement plate 3, or between the reinforcement structure 5 and the back door body. In this way, the reinforcement structure 5 is better connected to the hinge reinforcement plate 3 or the back door body, ensuring that the hinge has sufficient strength and rigidity.

[0079] In some embodiments, structural reinforcement glue can be provided between the reinforcement structure 5 and the hinge reinforcement plate 3, the first crossbeam 1, the second crossbeam 2, the back door inner panel 8, the back door outer panel and the window frame reinforcement plate 7 to form a reinforcement layer, so that the reinforcement structure 5 is better connected and the cavity structure at the hinge has sufficient strength and rigidity.

[0080] Optionally, the reinforcement structure 5 at least partially has a hollow structure.

[0081] In the embodiment of the present application, the strong structure is provided with at least a portion of a hollow structure, so as to achieve a lightweight structure.

[0082] In some embodiments, the entire reinforcement structure 5 can be set as a hollow structure, or part of the reinforcement structure 5 can be set as a hollow structure; illustratively, the first extension portion 52, the second extension portion 53 and the third extension portion 54 are all set as hollow structures, and the structural body 51 is set as a solid structure.

[0083] On the second aspect, an embodiment of the present application proposes a vehicle, including the tailgate assembly in the above embodiment, with a spare tire fixed on the tailgate assembly, and the tailgate assembly is a side-opening tailgate assembly or a lift-up tailgate assembly.

[0084] In the embodiment of the present application, the reinforcement structure 5 is connected to the hinge reinforcement plate 3 and at least partially connected to the spare tire mounting plate 4. In this way, part of the force transmitted from the spare tire mounting plate 4 to the tailgate hinge is borne by the hinge reinforcement plate 3, and the other part is borne by the reinforcement structure 5. This optimizes and expands the force transmission path at the tailgate hinge, enhances the rigidity of the tailgate hinge, and reduces the risk of hinge fracture and tailgate deformation.

[0085] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A back door assembly, characterized in that: It comprises a back door body, a reinforcement structure (5), a hinge reinforcement plate (3) and a spare tire mounting plate (4); The reinforcement structure (5), the hinge reinforcement plate (3), and the spare tire mounting plate (4) are all arranged on the tailgate body; wherein the reinforcement structure (5) is connected to the hinge reinforcement plate (3) and is at least partially connected to the spare tire mounting plate (4).

2. The back door assembly according to claim 1, characterized in that: The reinforcement structure (5) comprises a structural body (51) and a first extension portion (52); The structural body (51) is connected to the hinge reinforcement plate (3), the first extension portion (52) is connected to the structural body (51), and the first extension portion (52) is at least partially connected to the back door body.

3. The back door assembly according to claim 2, characterized in that: The first extension portion (52) extends from the structural body (51) to the spare tire mounting plate (4).

4. The back door assembly according to claim 3, characterized in that: A groove (6) is formed at the connection between the spare tire mounting plate (4) and the tailgate body, and the first extension portion (52) extends to the groove (6) and is connected to the spare tire mounting plate (4).

5. The back door assembly according to claim 2, characterized in that: The reinforcement structure (5) further includes a second extension portion (53); The second extension portion (53) is connected to the structural body (51), and the second extension portion (53) is at least partially connected to the back door body.

6. The back door assembly according to claim 5, characterized in that: The second extension portion (53) extends from the structural body (51) to the spare tire mounting plate (4).

7. The back door assembly according to claim 6, characterized in that: The second extension portion (53) extends to the connection between the spare tire mounting plate (4) and the tailgate body and is connected to the spare tire mounting plate (4).

8. The back door assembly according to claim 5, characterized in that: The structural body (51) and the second extension portion (53) are integrally formed parts.

9. The back door assembly according to claim 2, characterized in that: Also includes a window frame reinforcement plate (7); The window frame reinforcement plate (7) is connected to the hinge reinforcement plate (3), and the reinforcement structure (5) further includes a third extension portion (54), the third extension portion (54) is connected to the structural body (51), and the third extension portion (54) is at least partially connected to the window frame reinforcement plate (7).

10. The back door assembly according to claim 1, characterized in that: The back door body comprises a back door inner plate (8) and a back door outer plate, a cavity structure is formed between the back door inner plate (8) and the back door outer plate, the reinforcement structure is arranged in the cavity structure, and the reinforcement structure matches the shape of the cavity structure.

11. The back door assembly according to claim 10, characterized in that: The reinforcement structure (5) includes at least one welding portion (55); the welding portion (55) is welded to at least one of the back door inner panel (8) and the hinge reinforcement plate (3).

12. The back door assembly according to claim 1, characterized in that: The reinforcement structure is an integrated air pressure thermoforming structure.

13. The back door assembly according to claim 1, characterized in that: Also includes reinforcement layer; The reinforcement layer is provided between the reinforcement structure (5) and the hinge reinforcement plate (3); and / or, the reinforcement layer is provided between the reinforcement structure (5) and the back door body.

14. The back door assembly according to any one of claims 1 to 13, characterized in that: The reinforcing structure (5) at least partially has a hollow structure.

15. A vehicle, characterized in that: The invention comprises the back door assembly according to any one of claims 1 to 14.

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