A rear wall assembly and vehicle

Abstract

The application relates to a rear wall assembly and a vehicle, wherein a rear wall inner plate is provided with a first connecting area, a second connecting area, a third connecting area and a fourth connecting area from top to bottom; a first fixed plate assembly is connected with the rear wall inner plate to form a first stress cavity between the first connecting area and the second connecting area and a second stress cavity between the second connecting area and the third connecting area; the fourth connecting area is an annular area, and the first fixed plate assembly and the rear wall inner plate form a third stress cavity under the cooperation of the third connecting area and the fourth connecting area; upper and lower sides of a rear wall outer plate are connected with the other side of the first fixed plate assembly in the thickness direction, and the connecting areas of the upper and lower sides of the rear wall outer plate correspond to the first connecting area and the third connecting area respectively to form a fourth stress cavity between the rear wall outer plate and the first fixed plate assembly; the above structure optimizes the stress path of the rear wall assembly, and improves the mechanical properties of the rear wall assembly and the dynamic stiffness of the mounting point.

Description

Technical Field

[0001] This application relates to the field of automotive rear assembly technology, and particularly to a rear assembly and vehicle. Background Technology

[0002] The rear assembly mainly consists of the rear inner panel, the rear outer panel, and the tailgate latch mounting plate assembly. To improve the dynamic stiffness of the rear assembly mounting point, the size of the tailgate latch mounting plate assembly is generally increased, or brackets with supporting and reinforcing functions are added. However, this will increase the number and weight of the rear assembly parts, complicate the manufacturing process, and increase the overall vehicle weight, which is not conducive to improving the vehicle's power economy.

[0003] Furthermore, while the rear panel can be designed as a single piece, the Z-axis (vehicle height direction) height on both sides and the sheet metal profile of the rear panel can significantly limit its stamping process, especially when the Z-axis height is large and the sheet metal profile is complex. The rear panel can also be designed as a split structure, but this increases the number of molds and fixtures, raising management costs. The split rear panel requires welding to connect the parts, increasing welding processes, time, and the need for welding inspection. After assembly, the dimensional accuracy of the parts differs from that of a single-piece structure, and the process debugging cycle is also increased.

[0004] To optimize the dynamic stiffness of the rear assembly mounting point and improve the manufacturing process of the rear assembly, this proposal suggests a rear assembly with optimized layout and structure. Summary of the Invention

[0005] This application provides a rear assembly and a vehicle to optimize the dynamic stiffness of the rear assembly mounting point and improve the manufacturing process of the rear assembly.

[0006] In a first aspect, a rear assembly is provided, comprising:

[0007] The rear inner panel has a first connecting area, a second connecting area, a third connecting area and a fourth connecting area from top to bottom;

[0008] The first fixed plate assembly has one side in the thickness direction connected to the rear inner panel through the first connecting area, the second connecting area, the third connecting area, and the fourth connecting area to form a first force-bearing cavity between the first connecting area and the second connecting area, and a second force-bearing cavity between the second connecting area and the third connecting area; the fourth connecting area is an annular area, and with the cooperation of the third connecting area and the fourth connecting area, the first fixed plate assembly and the rear inner panel enclose and form a third force-bearing cavity;

[0009] The rear outer panel is connected to the other side of the first fixed plate assembly in the thickness direction on its upper and lower sides respectively. The connection areas on the upper and lower sides of the rear outer panel correspond to the first connection area and the third connection area respectively. A fourth force-bearing cavity is formed between the rear outer panel and the first fixed plate assembly.

[0010] In some embodiments, the first fixing plate assembly includes a through plate, a rear door latch mounting plate assembly, and a component fixing hook;

[0011] The through plate includes an upper through section, a lower through section, and a bent transition section, with the upper through section and the lower through section connected by the bent transition section;

[0012] The upper through-part is provided with the rear door latch mounting plate assembly; the lower through-part is provided with the part fixing hook located below the bottom of the rear outer panel.

[0013] In some embodiments, in the thickness direction of the first fixing plate assembly, the area where the rear door latch mounting plate assembly connects to the upper through portion is opposite to the second connection area;

[0014] In the thickness direction of the first fixed plate assembly, the area where the part fixing hook connects to the lower through portion is opposite to the fourth connection area or the third force-bearing cavity.

[0015] In some embodiments, the lower through portion has a raised portion, and the raised portion and the rear inner panel form the third force-bearing cavity;

[0016] The raised portion is provided with a first welding groove; the part fixing hook is connected to the raised portion through the first welding groove.

[0017] In some embodiments, the raised portion has electrophoretic fluid channels on both sides in the vehicle width direction; an electrophoretic fluid channel through hole is provided on the raised portion and above the first welding groove; an electrophoretic fluid channel is also provided at the bottom of the raised portion.

[0018] In some embodiments, a floor panel is connected to one side of the rear inner panel in the thickness direction; the floor panel, the rear inner panel, and the through panel form a three-layer overlapping structure.

[0019] In some embodiments, a second fixing plate assembly is also included, which is mounted on the rear inner panel and located below the rear outer panel.

[0020] In some embodiments, two second fixing plate assemblies are also included;

[0021] In the vehicle width direction, two second fixing plate assemblies are located on both sides of the first fixing plate assembly; the two second fixing plate assemblies are mounted on the rear inner panel and located below the bottom of the rear outer panel.

[0022] In some embodiments, the second fixing plate assembly includes a connecting plate with a welding edge on its outer side and a protrusion at its center. A second welding groove is provided on the protrusion, and a secondary hook is connected in the second welding groove. The secondary hook includes a vertical rod connected to the second welding groove. A vertical rod perpendicular to the rear inner panel is connected to the bottom of the vertical rod, and a horizontal rod perpendicular to the part fixing hook is connected to the end of the vertical rod away from the vertical rod.

[0023] The beneficial effects of the technical solution provided in this application include:

[0024] This application provides a rear bulkhead assembly and a vehicle. The rear bulkhead inner panel has a first connecting region, a second connecting region, a third connecting region, and a fourth connecting region from top to bottom. One side of the first fixed plate assembly in the thickness direction is connected to the rear bulkhead inner panel through the first connecting region, the second connecting region, the third connecting region, and the fourth connecting region to form a first force-bearing cavity between the first and second connecting regions, and a second force-bearing cavity between the second and third connecting regions. The fourth connecting region is an annular region. With the cooperation of the third and fourth connecting regions, the first fixed plate assembly and the rear bulkhead inner panel enclose and form a third force-bearing cavity. The rear bulkhead outer panel has its upper and lower sides connected to the other side of the first fixed plate assembly in the thickness direction, and the connecting regions on the upper and lower sides of the rear bulkhead outer panel correspond to the first and third connecting regions, respectively. A fourth force-bearing cavity is formed between the rear bulkhead outer panel and the first fixed plate assembly.

[0025] Through the above configuration, the force-bearing areas formed by the first, second, third, and fourth connection areas, as well as the combined action of the first, second, third, and fourth force-bearing cavities, allow the external forces on the rear assembly to be transmitted through the rear outer panel, the first fixed plate assembly, the rear inner panel, and the floor panel, forming four force paths and improving the mechanical performance of the rear assembly.

[0026] The top and bottom of the rear outer panel are connected to the rear inner panel through the first fixed plate assembly, forming a three-layer overlapping structure and creating a stress-bearing area. The through plate and the rear inner panel are connected to the tailgate latch mounting plate assembly or the floor panel, forming a three-layer overlapping structure and creating a stress-bearing area. This allows the external forces on the rear assembly to be transmitted through the rear outer panel, the first fixed plate assembly, the rear inner panel, and the floor panel, thereby improving the mechanical properties of the rear assembly, the dynamic stiffness of the rear assembly mounting points, and the NVH performance of the rear assembly and even the entire vehicle. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the overall structure of the rear assembly from a first-view perspective, provided for an embodiment of this application.

[0029] Figure 2 A schematic diagram of the overall structure of the rear assembly from a second perspective, provided in an embodiment of this application;

[0030] Figure 3 An exploded view of the rear assembly provided in an embodiment of this application;

[0031] Figure 4 A schematic diagram of a rear assembly without a rear outer panel provided in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the structure of the rear inner panel provided in an embodiment of this application;

[0033] Figure 6 This is a structural schematic diagram of the rear outer panel provided in an embodiment of this application;

[0034] Figure 7 A schematic diagram of the structure of the first fixed plate assembly with a third-view perspective provided in an embodiment of this application;

[0035] Figure 8 A schematic diagram of the structure of the first fixed plate assembly with a fourth perspective provided in an embodiment of this application;

[0036] Figure 9 A schematic diagram of the structure of a through-plate from a fifth perspective provided in an embodiment of this application;

[0037] Figure 10 for Figure 1 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0038] Figure 11 for Figure 10 Enlarged view of point B in the middle;

[0039] Figure 12 A three-dimensional structural diagram of the connection between the rear assembly without a rear outer panel and the floor panel, provided in an embodiment of this application;

[0040] Figure 13 In order to be in Figure 4 A schematic diagram of the overall structure of the rear assembly with the rear outer panel set on the basis of the above.

[0041] Figure 14 for Figure 4 The front view shown;

[0042] Figure 15 for Figure 14 Enlarged view of point E in the middle;

[0043] Figure 16 for Figure 13 A schematic diagram of the cross-sectional structure at the CC position, which has a force path label.

[0044] Figure 17 for Figure 13 A schematic diagram of the cross-sectional structure at the CC position marked with a connection area;

[0045] Figure 18 for Figure 17 Or a schematic diagram of the cross-sectional structure of the stress cavity and connecting area in the region where the rear outer panel of 16 is located;

[0046] Figure 19 for Figure 17 Or, a cross-sectional schematic diagram of the specific overlapping structure of the first and second connecting areas in 16;

[0047] Figure 20 for Figure 17 Or a schematic diagram of the cross-sectional structure of the stress-bearing cavity and connecting area in the region where the lower through-section of section 16 is located;

[0048] Figure 21 for Figure 17 Or a cross-sectional schematic diagram of the specific overlapping structure of the third connection area in 16;

[0049] Figure 22 for Figure 17 Or a cross-sectional schematic diagram of the specific overlapping structure of the fourth connection area in 16;

[0050] Figure 23 for Figure 13 A schematic diagram of the cross-sectional structure at the DD location, which has a force path label.

[0051] Figure 24 for Figure 13 A schematic diagram of the cross-sectional structure at the DD location marked with a connection area;

[0052] Figure 25 for Figure 23 Or, a schematic diagram of the cross-sectional structure of the stress cavity and connecting area in the region where the rear outer panel of section 24 is located;

[0053] Figure 26 for Figure 23 Or, a cross-sectional schematic diagram of the specific overlapping structure of the first and second connecting areas in 24;

[0054] Figure 27 for Figure 23 Or a schematic diagram of the cross-sectional structure of the stress-bearing cavity and connecting area in the region where the lower through-section of section 24 is located;

[0055] Figure 28 for Figure 23 Or a cross-sectional schematic diagram of the specific overlapping structure of the third connecting area in 24;

[0056] Figure 29 for Figure 23 Or a cross-sectional schematic diagram of the specific overlapping structure of the fourth connection area in 24;

[0057] Figure 30 This is a schematic diagram of the assembly structure of the rear inner panel and the second fixed plate;

[0058] Figure 31 for Figure 30 Enlarged diagram of point G in the middle.

[0059] In the diagram: 1. Rear inner panel; 2. Rear outer panel; 3. Fixing plate assembly; 300. Through plate; 3001. Upper through section; 3002. Lower through section; 3003. Bending transition section; 301. Rear door latch mounting plate assembly; 302. Raised section; 3020. First welding groove; 303. Electrophoresis liquid channel through hole; 304. Part fixing hook; 305. Electrophoresis liquid channel; 4. Floor panel; 5. Second fixing plate assembly; 501. Connecting plate; 502. Secondary hook. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] To optimize the dynamic stiffness of the rear assembly mounting point and improve the manufacturing process of the rear assembly, this proposal suggests a rear assembly with optimized layout and structure.

[0062] refer to Figures 1-11 This application provides a rear assembly comprising:

[0063] The rear inner panel 1 has a first connecting area a, a second connecting area b, a third connecting area c and a fourth connecting area d from top to bottom;

[0064] The first fixed plate assembly 3 has one side in the thickness direction connected to the rear inner plate 1 through a first connecting region a, a second connecting region b, a third connecting region c, and a fourth connecting region d to form a first force-bearing cavity F1 located between the first connecting region a and the second connecting region b, and a second force-bearing cavity F2 located between the second connecting region b and the third connecting region c; the fourth connecting region d is an annular region, and with the cooperation of the third connecting region c and the fourth connecting region d, the first fixed plate assembly 3 and the rear inner plate 1 enclose and form a third force-bearing cavity;

[0065] The rear outer panel 2 is connected to the other side of the first fixed plate assembly 3 in the thickness direction on its upper and lower sides respectively. The connection areas on the upper and lower sides of the rear outer panel 2 correspond to the first connection area a and the third connection area c respectively. A fourth force-bearing cavity F4 is formed between the rear outer panel 2 and the first fixed plate assembly 3.

[0066] The specific distribution and structure of the first connecting region a, the second connecting region b, the third connecting region c, and the fourth connecting region d described above, as well as the first force-bearing cavity F1, the second force-bearing cavity F2, the third force-bearing cavity F3, and the fourth force-bearing cavity F4, can be found in the appendix. Figure 12-29 The content displayed.

[0067] Regarding the annular region, it should be understood that:

[0068] It can be that the fourth connecting region d includes two vertical connecting regions d1 and one horizontal connecting region d2, which together with the third connecting region c form a complete ring-shaped region. In other words, the complete ring-shaped region is composed of the third connecting region c and the fourth connecting region d.

[0069] Alternatively, the fourth connection area d can include two vertical connection areas d1 and two horizontal connection areas d2; the two horizontal connection areas d2 are set vertically.

[0070] This application, through the combined action of the force-bearing areas formed by the first connecting area a, the second connecting area b, the third connecting area c, and the fourth connecting area d, and the first force-bearing cavity F1, the second force-bearing cavity F2, the third force-bearing cavity F3, and the fourth force-bearing cavity F4, allows the external forces on the rear assembly to be transmitted through the rear outer panel 2, the first fixed plate assembly 3, the rear inner panel 1, and the floor panel 4, forming four force-bearing paths and improving the mechanical properties of the rear assembly.

[0071] The top and bottom of the rear outer panel 2 are connected to the rear inner panel 1 through the first fixed plate assembly 3, forming a three-layer overlapping structure and a stress-bearing area; the through plate 300, the rear inner panel 1 and the tailgate latch mounting plate assembly 301 or the floor panel 4 are connected to form a three-layer overlapping structure and a stress-bearing area; so that the external force on the rear assembly can be transmitted through the rear outer panel 2, the first fixed plate assembly 3, the rear inner panel 1 and the floor panel 4, thereby improving the mechanical properties of the rear assembly, improving the dynamic stiffness of the rear assembly mounting points, and improving the NVH performance of the rear assembly and even the whole vehicle.

[0072] refer to Figures 7 to 11 In some preferred embodiments, the first fixing plate assembly 3 includes a through plate 300, a tailgate latch mounting plate assembly 301, and a part fixing hook 304. The through plate 300 includes an upper through portion 3001, a lower through portion 3002, and a bending transition portion 3003, with the upper through portion 3001 and the lower through portion 3002 connected by the bending transition portion 3003. The tailgate latch mounting plate assembly 301 is disposed on the upper through portion 3001, and the part fixing hook 304 is disposed on the lower through portion 3002, below the bottom of the rear outer panel 2. The through plate 300 connects the tailgate latch mounting plate assembly 301 and the part fixing hook 304 to form a continuous integral structure, namely the first fixing plate assembly 3. The presence of the first fixing plate assembly 3 forms a multi-layer overlapping structure and associates the aforementioned stress-bearing area with the stress-bearing cavity. Through the combined effects of the multi-layered overlapping structure, the stress-bearing area, and the stress-bearing cavity, the stress path is optimized, the mechanical properties of the rear assembly are improved, the dynamic stiffness of the rear assembly mounting points is improved, the modal characteristics of the rear assembly are improved, and the NVH performance of the vehicle body is improved.

[0073] In some preferred embodiments, reference is made to Figures 19-22 In the thickness direction of the first fixed plate assembly 3, the area where the back door latch mounting plate assembly 301 connects to the upper through portion 3001 is opposite to the second connecting area b; in the thickness direction of the first fixed plate assembly 3, the area where the part fixing hook 304 connects to the lower through portion 3002 is opposite to the fourth connecting area d or the third force-bearing cavity F3.

[0074] In some preferred embodiments, reference is made to Figure 8 and Figure 9 The lower through-hole 3002 has a raised portion 302, which connects to the rear inner panel 1 to form a third force-bearing cavity F3. The raised portion 302 has a first welding groove 3020. The part fixing hook 304 is connected to the raised portion 302 via the first welding groove 3020. During the welding of the part fixing hook 304, the presence of the first welding groove 3020 facilitates the positioning and welding of the part fixing hook 304. Furthermore, the presence of the first welding groove 3022 helps increase the structural strength of the through-hole plate 300. (Reference) Figure 15 With the cooperation of the third connecting region c and the fourth connecting region d, the first fixed plate assembly 3 and the rear inner plate 1 enclose each other to form the third force-bearing cavity F3; the third force-bearing cavity F3 is located in the middle of the annular region of the fourth connecting region d; the above arrangement structure improves the mechanical properties of the rear assembly and improves the dynamic stiffness of the mounting point of the rear assembly.

[0075] In some preferred embodiments, reference is made to Figure 22 and Figure 27 The raised portion 302 has electrophoretic liquid channels 305 on both sides in the vehicle width direction; an electrophoretic liquid channel through hole 303 is provided on the raised portion 302 and above the first welding groove 3020; an electrophoretic liquid channel 305 is also provided at the bottom of the raised portion 302. The above arrangement structure is conducive to ensuring sufficient electrophoresis of the vehicle body, avoiding liquid accumulation, and avoiding vehicle body corrosion.

[0076] In some preferred embodiments, reference is made to Figure 20 , Figure 22 , Figure 27 , Figure 29 A floor panel 4 is connected to one side of the rear inner panel 1 along its thickness direction; the floor panel 4, the rear inner panel 1, and the through plate 300 form a three-layer overlapping structure, and the external force on the floor panel 4 can be determined according to... Figure 16 and Figure 23 The force path shown is transmitted to the vehicle body through the rear assembly; the external forces on the first fixed plate assembly 3 and even the rear assembly can also be determined according to... Figure 16 and Figure 23 The force path shown is transmitted to the vehicle body through the floor panel 4; this effectively disperses and stably transmits the external forces on each component and assembly, optimizes the vehicle body's mechanical properties, improves the dynamic stiffness of the rear assembly mounting point, and improves the vehicle body's NVH performance.

[0077] In some preferred embodiments, a second fixing plate assembly 5 is also included, which is mounted on the rear inner panel 1 and located below the rear outer panel 2.

[0078] In some preferred embodiments, reference is made to Figure 30 and Figure 31 In addition to the first fixing plate assembly 3, it also includes two second fixing plate assemblies 5;

[0079] In the vehicle width direction, two second fixing plate assemblies 5 are located on both sides of the first fixing plate assembly 3; the two second fixing plate assemblies 5 are installed on the rear inner panel 1 and located below the bottom of the rear outer panel 2.

[0080] In some preferred embodiments, reference is made to Figure 31The second fixing plate assembly 5 includes a connecting plate 501. The outer side of the connecting plate 501 has a welding edge, and the center has a protrusion. The protrusion has a second welding groove, and a secondary hook 502 is connected in the second welding groove. The secondary hook 502 includes a vertical rod connected to the second welding groove. The bottom of the vertical rod is connected to a vertical rod perpendicular to the rear inner plate 1, and the end of the vertical rod away from the vertical rod is connected to a horizontal rod perpendicular to the part fixing hook 304.

[0081] The above solutions can be combined according to the size, weight, space layout requirements, process assembly requirements, and performance requirements of the installation parts to achieve the design goals.

[0082] In some preferred embodiments, reference Figure 1 , Figure 2 , Figure 5 and Figure 13 The height of the rear inner panel 1 in the Z-direction (vehicle height direction) on both sides is H. By reducing the height value H, it is beneficial to improve the stamping performance of the rear inner panel 1, form an integral rear inner panel structure, reduce the number of parts, reduce welding processes, control the number of molds and fixtures, improve the mechanical properties and NVH performance of the rear assembly, and optimize the manufacturing process of the rear assembly. In addition, the rear inner panel 1 in this application is an integral structure, referring to... Figure 14 The markings 100, 101 and 102 correspond to the various regions of the split rear panel structure in the prior art.

[0083] This application also proposes a vehicle that includes the rear assembly described above.

[0084] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0085] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0086] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rear enclosure assembly, characterized in that, It includes: The rear inner panel (1) has a first connecting area (a), a second connecting area (b), a third connecting area (c) and a fourth connecting area (d) from top to bottom; The first fixed plate assembly (3) has one side in the thickness direction connected to the rear inner panel (1) through the first connecting area (a), the second connecting area (b), the third connecting area (c), and the fourth connecting area (d) to form a first force-bearing cavity (F1) between the first connecting area (a) and the second connecting area (b), and a second force-bearing cavity (F2) between the second connecting area (b) and the third connecting area (c); the fourth connecting area (d) is an annular area, and with the cooperation of the third connecting area (c) and the fourth connecting area (d), the first fixed plate assembly (3) and the rear inner panel (1) enclose and form a third force-bearing cavity (F3). The rear outer panel (2) is connected to the other side of the first fixed plate assembly (3) in the thickness direction on its upper and lower sides respectively. The connection areas on the upper and lower sides of the rear outer panel (2) correspond to the first connection area (a) and the third connection area (c) respectively. A fourth force-bearing cavity (F4) is formed between the rear outer panel (2) and the first fixed plate assembly (3). The first fixing plate assembly (3) includes a through plate (300), a rear door latch mounting plate assembly (301), and a part fixing hook (304); the through plate (300) includes an upper through part (3001), a lower through part (3002), and a bending transition part (3003), and the upper through part (3001) and the lower through part (3002) are connected by the bending transition part (3003); the rear door latch mounting plate assembly (301) is provided on the upper through part (3001); the part fixing hook (304) is provided on the lower through part (3002) and below the bottom of the rear outer panel (2). In the thickness direction of the first fixed plate assembly (3), the area where the back door latch mounting plate assembly (301) is connected to the upper through part (3001) is opposite to the second connection area (b); in the thickness direction of the first fixed plate assembly (3), the area where the part fixing hook (304) is connected to the lower through part (3002) is opposite to the fourth connection area (d) or the third force-bearing cavity (F3).

2. The rear assembly as described in claim 1, characterized in that: The lower through portion (3002) has a raised portion (302), and the raised portion (302) and the rear inner panel (1) form the third force-bearing cavity (F3). The raised portion (302) is provided with a first welding groove (3020); the part fixing hook (304) is connected to the raised portion (302) through the first welding groove (3020).

3. The rear assembly as described in claim 2, characterized in that: The raised portion (302) has electrophoretic liquid channels (305) on both sides in the vehicle width direction; an electrophoretic liquid channel through hole (303) is provided on the raised portion (302) and above the first welding groove (3020); an electrophoretic liquid channel (305) is also provided at the bottom of the raised portion (302).

4. The rear assembly as described in claim 2, characterized in that: The rear inner panel (1) is connected to a floor panel (4) on one side in the thickness direction; the floor panel (4), the rear inner panel (1) and the through panel (300) form a three-layer overlapping structure.

5. The rear assembly as claimed in claim 1, characterized in that: It also includes a second fixing plate assembly (5), which is mounted on the rear inner panel (1) and located below the rear outer panel (2).

6. The rear assembly as claimed in claim 1, characterized in that: It also includes two second fixing plate assemblies (5); In the vehicle width direction, two second fixing plate assemblies (5) are located on both sides of the first fixing plate assembly (3); the two second fixing plate assemblies (5) are mounted on the rear inner panel (1) and located below the bottom of the rear outer panel (2).

7. The rear assembly as described in claim 5 or 6, characterized in that: The second fixing plate assembly (5) includes a connecting plate (501), the outer side of the connecting plate (501) has a welding edge, the center has a protrusion, the protrusion is provided with a second welding groove, and a secondary hook (502) is connected in the second welding groove; the secondary hook (502) includes a vertical rod connected to the second welding groove, the bottom of the vertical rod is connected to a vertical rod perpendicular to the rear inner plate (1), and the end of the vertical rod away from the vertical rod is connected to a horizontal rod perpendicular to the part fixing hook (304).

8. A vehicle, characterized in that, It includes the rear circumference assembly as described in any one of claims 1-7.

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