Lower vehicle body of vehicle body structure, dismounting and mounting method therefor, vehicle body structure, and vehicle

Abstract

A lower vehicle body (20) of a vehicle body structure (100), a dismounting and mounting method therefor, a vehicle body structure (100), and a vehicle. The lower vehicle body (20) comprises a front cabin assembly (21), a battery assembly (22), and a rear floor assembly (23). The front part of the battery assembly (22) detachably mates with the front cabin assembly (21), and the rear part of the battery assembly (22) detachably mates with the rear floor assembly (23). The battery assembly (22) is adapted to separately detachably mate with an upper vehicle body (10) of the vehicle body structure (100) relative to the front cabin assembly (21) and the rear floor assembly (23).

Description

Lower body of vehicle body structure and disassembly and assembly method thereof, vehicle body structure and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application number 202311634864.4 filed by Contemporary Amperex Technology Co., Ltd. on November 30, 2023, entitled “Lower body of vehicle body structure and method for disassembly and assembly thereof, vehicle body structure and vehicle,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a lower body of a vehicle body structure and a method for disassembling and assembling the lower body, a vehicle body structure, and a vehicle. Background Art

[0004] Battery-to-body integration (CTC), which integrates the battery pack and chassis, has become a major area of ​​research and development to improve efficiency and reduce costs. However, this integrated design complicates battery pack assembly and disassembly, hindering after-sales repairs.

[0005] Summary of the Invention

[0006] An embodiment of the present application provides a lower body of a vehicle body structure to facilitate the maintenance and replacement of a battery assembly.

[0007] In a first aspect, an embodiment of the present application provides a lower body of a vehicle body structure, comprising: a front cabin assembly, a battery assembly and a rear floor assembly, the front portion of the battery assembly being detachably mated with the front cabin assembly and the rear portion being detachably mated with the rear floor assembly, the battery assembly being adapted to be separately detachably mated with the upper body of the vehicle body structure relative to the front cabin assembly and the rear floor assembly.

[0008] In the above technical solution, the battery assembly is integrated into the lower body, which helps reduce the number of parts and the overall weight of the lower body. Furthermore, because the battery assembly is independently removable from the front compartment assembly and rear floor assembly, when the battery assembly needs to be repaired or replaced, only the battery assembly needs to be removed, without removing the front compartment assembly and rear floor assembly together. This greatly improves assembly and disassembly convenience, helps improve replacement and repair efficiency, and enhances the user experience.

[0009] In some embodiments, the front of the battery assembly abuts the front compartment assembly, and / or the rear of the battery assembly abuts the rear floor assembly.

[0010] In the above technical solution, the connection strength of the battery assembly can be improved by abutting.

[0011] In some embodiments, the front compartment assembly includes a first connecting portion, which is located on one side of the front of the battery assembly along the left-right direction, and a first connecting member is detachably provided between the first connecting portion and the battery assembly along the left-right direction; the rear floor assembly includes a second connecting portion, which is located on one side of the rear of the battery assembly along the left-right direction, and a second connecting member is detachably provided between the second connecting portion and the battery assembly along the left-right direction.

[0012] In the above technical solution, the first connecting member and the second connecting member can be assembled and disassembled from the side of the vehicle body structure without interfering with the connection between the front cabin assembly and the upper body, and there is no need to disassemble the front cabin assembly and the rear floor assembly.

[0013] In some embodiments, a first seal is provided between the side surface of the front portion of the battery assembly and the first connecting portion; and a second seal is provided between the side surface of the rear portion of the battery assembly and the second connecting portion.

[0014] In the above technical solution, the first sealing member and the second sealing member can improve the sealing between different components of the lower vehicle body, which is beneficial to improving the sealing of the engine compartment and the trunk compartment.

[0015] In some embodiments, the front of the battery assembly is located below the front cabin assembly, and the rear is located below the rear floor assembly. The battery assembly is provided with a first connecting structure, which is used to connect to at least one of the front cabin assembly and the rear floor assembly. The first connecting structure is suitable for disassembly and assembly in the up and down directions.

[0016] In the above technical solution, the first connecting structure can be disassembled from the bottom side, and after the connection of the first connecting structure is released, the battery assembly can be moved directly downward to separate from the upper body, the front cabin assembly and the rear floor assembly. At the same time, the front cabin assembly and the rear floor assembly will not interfere with the disassembly and movement of the battery assembly.

[0017] In some embodiments, a first seal is provided between the upper surface of the front portion of the battery assembly and the front compartment assembly; and a second seal is provided between the upper surface of the rear portion of the battery assembly and the rear floor assembly.

[0018] In the above technical solution, by setting the first seal and the second seal, the sealing between the various components of the lower body can be improved, which is beneficial to improving the sealing of the engine compartment and the trunk compartment; and the first connecting structure and the second connecting structure can improve the sealing effect and stability of the first seal and the second seal.

[0019] In some embodiments, the first connecting structure is fixed to the battery assembly and is suitable for connecting to the front compartment assembly or the rear floor assembly from bottom to top.

[0020] In the above technical solution, the first connecting structure can move up and down synchronously with the battery assembly. When the battery assembly connection is released, the battery assembly can be moved downward, which is conducive to improving the disassembly and assembly efficiency.

[0021] In some embodiments, the first connection structure includes a first fastener and a first mounting hole provided in the battery assembly, the first mounting hole extends up and down, the first fastener passes upward through the first mounting hole and is connected to the front compartment assembly or the rear floor assembly.

[0022] In the above technical solution, the first fastener can be operated from the lower side of the lower body during the disassembly process. The first fastener is moved downward during disassembly, and there is no positional interference with the upper structure, which facilitates the separate disassembly and assembly of the battery assembly. The first fastener can also improve the connection strength of the battery assembly.

[0023] In some embodiments, the battery assembly is provided with a first avoidance hole located below the first mounting hole and connected to the first mounting hole, and the aperture of the first avoidance hole is larger than the outer diameter of the first fastener.

[0024] In the above technical solution, the length of the first fastener in the up-down direction is smaller than the size of the battery assembly in the up-down direction, which is beneficial to reducing the size of the first fastener while ensuring the connection strength requirements, and the first avoidance hole avoids the first fastener, so that the disassembly and assembly of the first fastener is not interfered with.

[0025] In some embodiments, the first sealing member and / or the second sealing member is an elastic sealing ring, and the elastic sealing ring is used for press-fitting with the battery assembly.

[0026] In the above technical solution, the pressure generated by the connection of the battery assembly is used to tighten the elastic sealing ring, which is beneficial to improving the sealing effect. When the battery assembly needs to be disassembled, the fixing structure of the battery assembly can be released to cancel the pressing force on the elastic sealing ring. The elastic sealing ring can be separated from the battery assembly, making the battery assembly easy to disassemble and assemble.

[0027] In some embodiments, the first sealing member and / or the second sealing member is an adhesive, and the adhesive is used to bond with the battery assembly.

[0028] In the above technical solution, the adhesive is sticky, which can achieve a better sealing effect and is not easily misaligned during assembly, thereby affecting the sealing effect. When the battery assembly needs to be disassembled, the adhesive can be removed by tearing it off without affecting the disassembly of the battery assembly.

[0029] In some embodiments, the adhesive is made of butyl putty.

[0030] In the above technical solution, butyl putty is a relatively weak adhesive, which can achieve sealing while reducing the difficulty of tearing and removing.

[0031] In some embodiments, the battery assembly includes a box body and a battery cell arranged in the box body, and the box body includes: a frame body, the frame body includes a door sill beam, the front cabin assembly and the rear floor assembly are respectively connected to the frame body; and a bottom plate, the periphery of the bottom plate is connected to the lower end of the frame body.

[0032] In the above technical solution, the door sill beam is connected to the frame wall of the frame to improve the overall structural strength of the box; or the door sill beam directly serves as the frame wall of the frame to reduce the number of components of the battery assembly, reduce the space occupied by the box to increase energy density, and reduce the weight of the entire vehicle.

[0033] In some embodiments, the box body further includes a cover body, and the periphery of the cover body is connected to the upper end of the frame body.

[0034] In the above technical solution, it is convenient to seal the upper end of the frame through the cover before the battery assembly is matched with the upper vehicle body, thereby improving the sealing effect and the convenience of operation.

[0035] In some embodiments, the cover includes a front floor.

[0036] In the above technical solution, the front floor is integrated into the battery assembly and is disassembled and assembled together with the battery assembly, which is beneficial to reducing the number of parts of the cover, reducing the space and weight occupied by the box, and improving energy density.

[0037] In a third aspect, an embodiment of the present application further provides a vehicle body structure, which includes an upper body and a lower body of the above-mentioned vehicle body structure, wherein the lower body is installed on the lower side of the upper body to cooperate in defining a passenger compartment.

[0038] In the above technical solution, the battery assembly is integrated into the lower body, which helps reduce the number of parts and the overall weight of the lower body. Furthermore, because the battery assembly is independently removable from the front compartment assembly and rear floor assembly, when the battery assembly needs to be repaired or replaced, only the battery assembly needs to be removed, without removing the front compartment assembly and rear floor assembly together. This greatly improves assembly and disassembly convenience, helps improve replacement and repair efficiency, and enhances the user experience.

[0039] In some embodiments, the upper surface of at least a portion of the side wall of the battery assembly includes a mating surface, and the mating surface abuts against the upper vehicle body.

[0040] In the above technical solution, the mating surface abuts against the upper vehicle body, which is beneficial to improving the connection strength between the battery assembly and the upper vehicle body.

[0041] In some embodiments, the side wall is provided with a plurality of the mating surfaces, and the plurality of the mating surfaces are arranged along the inner and outer directions of the side wall and are staggered in height along the upper and lower directions.

[0042] In the above technical solution, multiple mating surfaces form a stepped upper surface. This not only allows for inward and outward positioning and vertical support, thereby improving the connection strength between the battery assembly and the upper vehicle body, but also enables multiple connection points in the inward and outward directions, thereby improving connection reliability.

[0043] In some embodiments, a second connection structure is provided in the middle of the battery assembly, and the second connection structure is connected to the upper body and is suitable for disassembly and assembly along the up and down directions.

[0044] In the above technical solution, the second connecting structure is formed as a Z-direction connecting structure, so that the second connecting structure can be disassembled from the lower side of the lower body without being interfered with by other structures of the upper body and the lower body, thereby facilitating the separate disassembly of the battery assembly and making the operation more convenient.

[0045] In some embodiments, the second connection structure includes a second fastener and a second mounting hole provided on the battery assembly, the second mounting hole extends in the up and down directions, and the second fastener passes upward through the second mounting hole and is connected to the upper body.

[0046] In the above technical solution, the second fastener can be operated from the lower side of the lower body during the disassembly process. During disassembly, the second fastener is moved downward and there is no positional interference with the upper structure, which facilitates the separate disassembly and assembly of the battery assembly. The second fastener can also improve the connection strength between the battery assembly and the upper body.

[0047] In some embodiments, the second connection structure is fixed to the battery assembly and is suitable for connecting to the upper vehicle body from bottom to top.

[0048] In the above technical solution, the second connecting structure can move up and down synchronously with the battery assembly, and while releasing the connection between the battery assembly and the upper body, the battery assembly can be moved downward, which is conducive to improving the disassembly and assembly efficiency.

[0049] In some embodiments, the vehicle body structure includes a third seal, which extends along the circumference of the passenger compartment and seals the gap between the lower body and the upper body, the front portion of the third seal is sealed with the front compartment assembly, the middle portion of the third seal is sealed with the middle portion of the battery assembly, and the rear portion of the third seal is sealed with the rear floor assembly.

[0050] In the above technical solution, the third seal is provided to seal the upper and lower bodies, preventing water, dust, and other intrusions into the passenger compartment. Furthermore, the second connection structure connecting the battery assembly and the upper body in the vertical direction provides a compressive force to the third seal, enhancing not only the sealing effect but also its stability and service life.

[0051] In a third aspect, an embodiment of the present application further provides a vehicle comprising the above-mentioned vehicle body structure.

[0052] In a fourth aspect, an embodiment of the present application also provides a method for disassembling and assembling a lower body, wherein the lower body is the lower body of the above-mentioned body structure, and the disassembly and assembly method includes a disassembly process of separately disassembling the battery assembly, and the disassembly process includes: releasing the connection between the battery assembly and the front cabin assembly, the rear floor assembly and the upper body respectively; moving the battery assembly downward, and releasing the seals between the battery assembly and the front cabin assembly, the rear floor assembly and the upper body respectively, so as to realize the separate disassembly of the battery assembly.

[0053] In the above technical solution, integrating the battery assembly into the lower body helps reduce the number of parts and the overall weight of the vehicle body structure. Furthermore, when the battery assembly needs to be repaired or replaced, only the battery assembly needs to be removed, without removing the front cabin assembly and rear floor assembly. This greatly improves assembly and disassembly convenience, facilitating efficient replacement and repair, and enhancing the user experience.

[0054] In some embodiments, the disassembly and assembly method includes a reassembly process of the battery assembly, and the reassembly process includes: providing a seal on the battery assembly that extends circumferentially along the battery assembly; installing the battery assembly from bottom to top on the front cabin assembly, the rear floor assembly and the upper body, and sealing it with the front cabin assembly through the front of the seal, sealing it with the rear floor assembly through the rear of the seal, and sealing it with the upper body through the middle of the seal.

[0055] In the above embodiment, by providing a seal, it is beneficial to improve the sealing of the mating parts after the battery assembly is reassembled, thereby improving the sealing effect of the battery assembly, the engine compartment, the passenger compartment and the body structure.

[0056] In the fifth aspect, an embodiment of the present application also provides a method for disassembling and assembling a lower body, wherein the lower body is the lower body of the above-mentioned body structure, and the disassembly and assembly method includes the assembly process of the lower body, and the assembly process includes: the disassembly and assembly method includes the assembly process of the lower body, and the assembly process includes: setting a first seal at the front of the battery assembly and setting a second seal at the rear of the battery assembly; detachably installing the battery assembly between the front cabin assembly and the rear floor assembly, and making the first seal seal the gap between the front of the battery assembly and the front cabin assembly, and making the second seal seal the gap between the rear of the battery assembly and the rear floor assembly.

[0057] In the above embodiment, integrating the battery assembly into the lower body helps reduce the number of components and the overall weight of the vehicle body structure. Furthermore, when the battery assembly needs to be repaired or replaced, only the battery assembly needs to be removed, without removing the front compartment assembly and rear floor assembly. This greatly improves assembly and disassembly convenience, facilitating improved replacement and repair efficiency and enhancing the user experience.

[0058] In some embodiments, the disassembly and assembly method includes an assembly process of installing the lower body on the upper body, and the assembly process includes: setting a third seal extending around the passenger compartment on the upper side of the lower body; installing the lower body upward on the lower side of the upper body, and allowing the third seal to seal the gap between the lower body and the upper body.

[0059] In the above embodiment, the third sealing member can seal the seal between the upper vehicle body and the lower vehicle body, thereby improving the sealing performance of the periphery of the bottom of the passenger compartment and enhancing the waterproof and dustproof effects.

[0060] In some embodiments, the disassembly and assembly method includes a disassembly process of separately disassembling the battery assembly, and the disassembly process includes: releasing the connection between the battery assembly and the front cabin assembly, the rear floor assembly and the upper body respectively; moving the battery assembly downward, and releasing the seals between the battery assembly and the front cabin assembly, the rear floor assembly and the upper body respectively, so as to achieve separate disassembly of the battery assembly.

[0061] In the above embodiment, the battery assembly can be disassembled separately without separating the front compartment assembly, the rear floor assembly and the upper body, which greatly improves the convenience of disassembly and assembly, is conducive to improving replacement and maintenance efficiency, and improves user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 is a schematic diagram of a vehicle body structure according to an embodiment of the present application in one state, wherein the upper vehicle body is separated from the lower vehicle body;

[0063] FIG2 is a schematic diagram of a vehicle body structure according to an embodiment of the present application, wherein the upper vehicle body is connected to the lower vehicle body;

[0064] FIG3 is a schematic diagram of a vehicle body structure according to an embodiment of the present application in one state, wherein the battery assembly is separated from the upper vehicle body;

[0065] FIG4 is a schematic structural diagram of the lower vehicle body provided in an embodiment of the present application;

[0066] FIG5 is an exploded view of the lower vehicle body and the sealing member provided in an embodiment of the present application;

[0067] FIG6 is a schematic structural diagram of a battery assembly provided in an embodiment of the present application;

[0068] FIG7 is a schematic diagram of the partial coordination structure of the battery assembly and the upper vehicle body provided in an embodiment of the present application;

[0069] FIG8 is a flow chart of a method for disassembling and assembling a lower vehicle body according to an embodiment of the present application.

[0070] Figure numerals: Vehicle body structure 100; Upper vehicle body 10; Lower vehicle body 20; Front cabin assembly 21; Front anti-collision beam 211; Front longitudinal beam 212; Front torsion box 213; Battery assembly 22; Box body 202; Frame body 222; Mating surface 223; Sill beam 224; Cover body 225; Bottom plate 226; Second avoidance hole 227; Rear floor assembly 23; Rear anti-collision beam 231; Rear longitudinal beam 232; Rear torsion box 233; Rear cross beam 234; Rear floor 235; First connecting structure 31; First fastener 311; First mounting hole 312; Second connecting structure 32; Second fastener 321; Second mounting hole 322; Seal 40; Third seal 41; First sealing portion 411; Second sealing portion 412; Third sealing portion 413; First seal 42; Second seal 43. DETAILED DESCRIPTION

[0071] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0072] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0073] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0075] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0076] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0077] The term "plurality" used in this application refers to two or more (including two).

[0078] Batteries can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircraft. Batteries and other components can form the power supply system of such devices to ensure the safety and reliability of the devices. For example, electrical devices can include, but are not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, new energy vehicles, or rail vehicles. New energy vehicles can include pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, extended-range electric vehicles, and fuel cell vehicles.

[0079] In some related technologies, the vehicle has a complete chassis structure, including crossbeams, frame longitudinal beams, floors and other structures. The battery pack is then installed on the chassis of the vehicle. It has many parts, a complex structure, is heavy, and is difficult to replace and repair.

[0080] Among other related technologies, battery-to-body integration (CTC), which integrates the battery pack and chassis, has become a key area of ​​research and development for improving efficiency and reducing costs. It can reduce the number of parts and lower vehicle weight. However, the integrated design complicates battery pack assembly and disassembly. For replacement and repair, the battery pack and chassis integrated structure must be separated from the upper body, and then the battery pack and chassis must be separated before repair or replacement, which is not conducive to after-sales maintenance.

[0081] Based on this, the present application proposes a lower body 20 of a vehicle body structure 100 that facilitates after-sales maintenance of batteries.

[0082] In this application, the vehicle body structure 100 refers to the arrangement of the various components that make up the vehicle body. The vehicle body structure 100 includes an upper body 10 and a lower body 20. The upper body 10 is the portion of the vehicle used to carry passengers and cargo, and may include, for example, windows, doors, and a passenger compartment. The lower body 20 includes a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23.

[0083] The front compartment assembly 21 is used to transmit frontal collision loads. For example, the front compartment assembly 21 may include a front anti-collision beam 211, two front longitudinal beams 212, and two front torque boxes 213. The front ends of the two front longitudinal beams 212 are connected to the ends of the front anti-collision beam 211, and the rear ends of the two front longitudinal beams 212 are connected to the two front torque boxes 213. The front torque boxes 213 are connected to the battery assembly 22. When the vehicle is hit, the front anti-collision beam 211 can evenly bear the expansion load, and the collision load is shared by the two front longitudinal beams 212 and the corresponding two front torque boxes 213, thereby reducing damage to the passenger compartment.

[0084] The rear floor assembly 23 serves as a mounting platform for system components such as interior and exterior trim, electrical appliances, and other components. It carries passengers, houses the spare tire, and, during a rear-end collision, deforms to minimize fuel tank damage and occupant injury. For example, the rear floor assembly 23 may include a rear anti-collision beam 231, two rear longitudinal beams 232, two rear torsion boxes 233, a rear crossbeam 234, and a rear floor 235. The rear ends of the two rear longitudinal beams 232 are connected to the ends of the rear anti-collision beam 231, respectively. The front ends of the two rear longitudinal beams 232 are connected to the two rear torsion boxes 233, respectively. The rear torsion boxes 233 are connected to the battery assembly 22. The rear crossbeam 234 connects the two rear torsion boxes 233. The rear floor 235 is mounted between the two rear longitudinal beams 232.

[0085] The battery assembly 22 is a physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery assembly 22 referred to herein may include a battery module or battery pack. Some battery assemblies 22 may include a housing 202 for housing one or more battery cells or battery modules. The housing 202 reduces or prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0086] The structure of the box 202 can be flexibly set. For example, in some embodiments, the box 202 can include a first shell and a second shell, and the first shell and the second shell are fastened to form a sealed box 202. In other embodiments, the box 202 includes a frame 222, and the frame 222 has an upper end opening and a lower end opening. The frame 222 cooperates with other structures of the vehicle to achieve sealing. In still other embodiments, the box 202 includes a cover 225 and a bottom plate 226 and the frame 222, the cover 225 is connected to the upper end of the frame 222, and the bottom plate 226 is connected to the lower end of the frame 222, so that the box 202 has an end opening, and the end opening can cooperate with other structures of the vehicle to achieve sealing. One of the cover 225 and the bottom plate 226 can be integrally formed with the frame 222, or the cover 225, the bottom plate 226 and the frame 222 can also be separate parts connected together. Of course, in other embodiments, the box body 202 may also include a frame body 222, a cover body 225 and a bottom plate 226 at the same time, which are all within the scope of protection of this application.

[0087] Battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the present application does not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the present application does not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present application does not limit this.

[0088] For example, a battery cell may include a housing, an electrode assembly, and an electrolyte. The housing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0089] The vehicle body structure 100 proposed in this application includes an upper body 10 and a lower body 20. The lower body 20 is mounted on the underside of the upper body 10 to define a passenger compartment. The lower body 20 of the vehicle body structure 100 proposed in this application includes a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23. The front portion of the battery assembly 22 is detachably mated to the front cabin assembly 21, and the rear portion of the battery assembly 22 is detachably mated to the rear floor assembly 23. The battery assembly 22 can be independently detachably mated to the upper body 10 of the vehicle body structure 100 relative to the front cabin assembly 21 and the rear floor assembly 23.

[0090] In the description of this application, the directions such as up, down, front, back, left and right are all based on the orientation of the vehicle, that is, the direction from the front of the vehicle to the rear of the vehicle is from front to back, the direction from the roof to the bottom of the vehicle is from top to bottom, and the main driver's seat and the co-driver's seat are arranged along the left and right directions.

[0091] In the lower body 20 of the vehicle body structure 100 described above, the battery assembly 22 is integrated into the lower body 20, which helps reduce the number of parts and the overall weight of the lower body 20. Furthermore, because the battery assembly 22 is independently removable from the front compartment assembly 21 and the rear floor assembly 23, when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be removed, without removing both the front compartment assembly 21 and the rear floor assembly 23. This greatly improves assembly and disassembly convenience, enhances replacement and repair efficiency, and improves the user experience.

[0092] The vehicle body structure 100 including the lower body 20 according to the embodiment of the present application can be used in vehicles, which can be fuel vehicles, gas vehicles, new energy vehicles, or rail vehicles. The new energy vehicles can be pure electric vehicles, hybrid vehicles, plug-in hybrid vehicles, extended-range electric vehicles, and fuel cell powered vehicles, etc.

[0093] Below, with reference to the accompanying drawings, the lower body 20 of the body structure 100 according to the first embodiment of the present application and the body structure 100 according to the second embodiment of the present application are described. The body structure 100 includes an upper body 10 and the lower body 20 according to the first embodiment of the present application. The lower body 20 is installed on the lower side of the upper body 10, and the upper body 10 and the lower body 20 cooperate to define a passenger compartment.

[0094] Please refer to Figures 1-5. Figures 1-3 are schematic diagrams of a vehicle body structure 100 according to an embodiment of the present application in different states. In Figure 1, the upper body 10 is separated from the lower body 20; in Figure 2, the upper body 10 is connected to the lower body 20; and in Figure 3, the battery assembly 22 is separated from the upper body 10. Figure 4 is a schematic structural diagram of the lower body 20 according to an embodiment of the present application; and Figure 5 is an exploded view of the lower body 20 and the sealing structure 40 according to an embodiment of the present application. The vehicle body structure 100 comprises an upper body 10 and a lower body 20. The lower body 20 of the vehicle body structure 100 includes a front compartment assembly 21, a battery assembly 22, and a rear floor assembly 23. The front portion of the battery assembly 22 is detachably coupled to the front compartment assembly 21, and the rear portion of the battery assembly 22 is detachably coupled to the rear floor assembly 23. The battery assembly 22 can be detachably coupled to the upper body 10 of the vehicle body structure 100 independently of the front compartment assembly 21 and the rear floor assembly 23.

[0095] The front portion of the battery assembly 22 and the front compartment assembly 21 may be removably connected by, but not limited to, clearance fit, abutment, snap-fit, bonding, or connection with fasteners 30 (e.g., bolts). Similarly, the rear portion of the battery assembly 22 and the rear floor assembly 23 may be removably connected by, but not limited to, clearance fit, abutment, snap-fit, bonding, or connection with fasteners 30.

[0096] The connection methods between the lower body 20 and the upper body 10 include, but are not limited to, welding, clamping, bonding, and connection with fasteners 30. It should be noted that among the front compartment assembly 21, battery assembly 22, and rear floor assembly 23 in the lower body 20, one or two may be directly connected to the upper body 10, or all three may be directly connected to the upper body 10. In the embodiment where the battery assembly 22 is directly connected to the upper body 10, the battery assembly 22 and the upper body 10 are detachably connected.

[0097] The battery assembly 22 is independently detachable from the front compartment assembly 21 and the rear floor assembly 23 and is engaged with the upper body 10. In other words, when the battery assembly 22 needs to be removed, only the battery assembly 22 can be removed while the front compartment assembly 21 and the rear floor assembly 23 remain connected to the upper body 10. For example, in an embodiment where the battery assembly 22 is directly connected to the front compartment assembly 21 and the rear floor assembly 23 and abuts the upper body 10, the battery assembly 22 can be disconnected from the front compartment assembly 21 and the rear floor assembly 23 while the front compartment assembly 21 and the rear compartment assembly remain connected to the upper body 10, thereby facilitating separation of the battery assembly 22 from the upper body 10. For another example, in an embodiment in which the battery assembly 22 is connected to the upper body 10 via fasteners 30, the connection between the battery assembly 22 and the upper body 10 can be released without affecting the connection between the front compartment assembly 21 and the rear compartment assembly and the upper body 10, so as to facilitate separation of the battery assembly 22 from the upper body 10.

[0098] Of course, in the embodiment where the front cabin assembly 21 is detachable, when the front cabin assembly 21 is disassembled, the front cabin assembly 21 can be detachable alone, or it can be detached together with the battery assembly 22, or it can be detached together with the battery assembly 22 and the rear floor assembly 23; in the embodiment where the rear floor assembly 23 is detachable, when the rear floor assembly 23 is disassembled, the rear floor assembly 23 can be detachable alone, or it can be detached together with the battery assembly 22, or it can be detached together with the battery assembly 22 and the front cabin assembly 21, all of which are within the scope of protection of the present application.

[0099] In the vehicle body structure 100 according to the embodiment of the present application, the battery assembly 22 is integrated into the lower body 20, which helps reduce the number of parts and the total weight of the lower body 20. Furthermore, because the battery assembly 22 is independently removable from the front compartment assembly 21 and the rear floor assembly 23, when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be removed, without removing the front compartment assembly 21 and the rear floor assembly 23 together. This greatly improves the convenience of assembly and disassembly, helps improve replacement and repair efficiency, and enhances the user experience.

[0100] In some embodiments, the front of the battery assembly 22 abuts the front compartment assembly 21; in some embodiments, the rear of the battery assembly 22 abuts the rear floor assembly 23; in some embodiments, as shown in Figure 4, the front of the battery assembly 22 abuts the front compartment assembly 21, and the rear of the battery assembly 22 abuts the rear floor assembly 23.

[0101] Abutment refers to the contact and compression between two components to enhance the strength of the connection. Taking the battery assembly 22 and the front compartment assembly 21 as an example, the upper surface of the front portion of the battery assembly 22 can abut against the lower surface of the connection point of the front compartment assembly 21 to achieve reliable vertical positioning and fixation of the battery assembly 22 and the front compartment assembly 21; or the side surface of the front portion of the battery assembly 22 facing away from the center of the battery assembly 22 can abut against the side surface of the front compartment assembly 21 to achieve reliable horizontal positioning and fixation of the battery assembly 22 and the front compartment assembly 21 (e.g., at least one of the left-right and front-back directions).

[0102] According to some embodiments of the present application, as shown in FIG7 , the upper surface of at least a portion of the sidewall of the battery assembly 22 includes a mating surface 223, which abuts against the upper body 10. The abutment between the mating surface 223 and the upper body 10 helps to improve the connection strength between the battery assembly 22 and the upper body 10.

[0103] The mating surface 223 may be an annular surface extending continuously along the circumference of the battery assembly 22 , or may be a portion of the upper surface of the side wall, both of which may improve the overall strength to varying degrees.

[0104] In some embodiments, the battery assembly 22 includes a frame 222, wherein the upper surface of at least a portion of the frame walls of the frame 222 includes a mating surface 223. The frame 222 is a closed annular structure extending around the centerline of the battery assembly 22. Annular structures include, but are not limited to, square and circular rings. For example, as shown in FIG6 , the frame 222 is a closed square annular structure comprising a front frame wall, a left frame wall, a rear frame wall, and a right frame wall connected end to end.

[0105] In some embodiments, as shown in Figures 6 and 7, the side wall is provided with a plurality of mating surfaces 223, which are arranged along the inner and outer directions of the side wall (i.e., the direction close to and away from the center) and are staggered in height along the upper and lower directions, and the plurality of mating surfaces 223 are respectively in contact with the upper body 10.

[0106] For example, the upper surface of at least part of the frame wall of the frame body 222 includes multiple mating surfaces 223, that is, the upper surfaces of all frame walls of the frame body 222 include multiple mating surfaces 223, or the upper surface of a part of the frame wall includes multiple mating surfaces 223, or the upper surface of the entire frame wall of one side includes multiple mating surfaces 223, or the upper surface of a part of the frame wall of one side includes multiple mating surfaces 223.

[0107] As shown in FIG7 , the plurality of mating surfaces 223 are arranged at different heights in the vertical direction, so that the upper surface forms a stepped surface. For example, the mating surfaces 223 extend horizontally, and two adjacent mating surfaces 223 are connected by a connecting surface extending in the vertical direction. The heights of the plurality of mating surfaces 223 can increase from the inside to the outside (i.e., away from the center of the frame 222), decrease as shown in FIG7 , or alternate between increasing and decreasing.

[0108] The multiple mating surfaces 223 abut the upper body 10, forming a matching stepped surface. This not only allows for inward and outward positioning (i.e., moving toward and away from the battery cells) and vertical support, but also helps improve the connection strength between the battery assembly 22 and the upper body 10. Furthermore, multiple connections can be made in the inward and outward directions, improving connection reliability.

[0109] According to some embodiments of the present application, the front compartment assembly 21 may include a first connection portion, the first connection portion being located on one side of the front portion of the battery assembly 22 in the left-right direction, and a first connection member being detachably provided between the first connection portion and the battery assembly 22 in the left-right direction. The rear floor assembly 23 may include a second connection portion, the second connection portion being located on one side of the rear portion of the battery assembly 22 in the left-right direction, and a second connection member being detachably provided between the second connection portion and the battery assembly 22 in the left-right direction.

[0110] The first connection portion may be a portion of the front longitudinal beam 212 of the front cabin assembly 21, or may be at least a portion of the front torsion box 213. The second connection portion may be a portion of the rear longitudinal beam 232 of the rear floor assembly 23, or may be at least a portion of the rear torsion box 233.

[0111] The specific structures of the first connecting member and the second connecting member are not limited, and include but are not limited to fasteners 30 such as bolts, buckles, and locking pins driven by a motor.

[0112] Taking the first connector as an example, the first connector can be assembled and disassembled in the left-right direction. That is, it can connect the first connecting portion and the battery assembly 22 in the left-right direction and can be disassembled in the left-right direction to separate the battery assembly 22 from the first connecting portion, thereby facilitating the separation of the battery assembly 22 from the front compartment assembly 21. The first connector can be assembled and disassembled from the side of the vehicle body structure 100 without interfering with the connection between the front compartment assembly 21 and the upper body 10, and without requiring disassembly of the front compartment assembly 21.

[0113] For example, in some embodiments, the front compartment assembly 21 further includes a first upper body connection portion for connecting to the upper body 10, which may be spaced apart from the first connection portion. The rear floor assembly 23 further includes a second upper body connection portion for connecting to the upper body 10, which may be spaced apart from the second connection portion. The first and second upper body connection portions may be connected to the upper body 10 using any connection method, such as welding or fasteners 30. The first and second upper body connection portions, and the second and second upper body connection portions, may be spaced apart in the front-to-back direction, in the left-to-right direction, or in the top-to-bottom direction. For example, the first and second upper body connection portions may be located in an area obstructed by the upper body 10, while the first and second upper body connection portions may be located in an area not obstructed by the upper body 10. For example, the first and second upper body connection portions may be staggered relative to the upper body 10, or the upper body 10 may be provided with a clearance extending in the left-to-right direction opposite the first and second connection portions.

[0114] In some embodiments connected by a first connector and a second connector, a first seal 42 is provided between the side surface of the front portion of the battery assembly 22 and the first connection portion of the front compartment assembly 21, and a second seal 43 is provided between the side surface of the rear portion of the battery assembly 22 and the second connection portion of the rear floor assembly 23.

[0115] The first seal 42 can seal the gap between the front compartment assembly 21 and the battery assembly 22, and the second seal 43 can seal the gap between the rear floor assembly 23 and the battery assembly 22, thereby improving the sealing between different components of the lower body 20, which is beneficial to improving the sealing of the engine compartment and the trunk compartment.

[0116] Furthermore, the side surface of the battery assembly 22 refers to the surface of one side of the battery assembly 22 in the left-right direction. That is, in the left-right direction, the first sealing member 42 is located between the battery assembly 22 and the first connecting portion. When the first connecting member connects the battery assembly 22 and the first connecting portion in the left-right direction, it can provide a compressive force to the first sealing member 42, which not only improves the sealing effect but also increases the stability and service life of the first sealing member 42. Similarly, the second sealing member 42 is in sealing contact with the side surface of the battery assembly 22, and the second connecting member can also be used to improve the sealing effect and stability.

[0117] According to some embodiments of the present application, as shown in FIG1 and FIG4 , the front portion of the battery assembly 22 is located below the front compartment assembly 21, and the rear portion of the battery assembly 22 is located below the rear floor assembly 23. In other words, the front portion of the battery assembly 22 is aligned with the front compartment assembly 21 in the front-to-back direction and is located on the side of the front compartment assembly 21 away from the upper vehicle body 10, while the rear portion of the battery assembly 22 is aligned with the rear floor assembly 23 in the front-to-back direction and is located on the side of the rear floor assembly 23 away from the upper vehicle body 10.

[0118] Therefore, after the connection structure of the battery assembly 22 is disconnected, the battery assembly 22 can move directly downward to separate from the upper body 10, the front cabin assembly 21 and the rear floor assembly 23, and the front cabin assembly 21 and the rear floor assembly 23 will not interfere with the disassembly movement of the battery assembly 22.

[0119] Of course, in other embodiments, the front of the battery assembly 22 and the front cabin assembly 21 can be completely staggered in the front-to-back direction, and the rear of the battery assembly 22 and the rear floor assembly 23 can be completely staggered in the front-to-back direction, that is, the front cabin assembly 21, the battery assembly 22 and the rear floor assembly 23 are strictly staggered in sequence from front to back.

[0120] In addition, in an embodiment where the battery assembly 22 is located below the front cabin assembly 21 and the rear floor assembly 23, please refer to Figures 1 to 5. The battery assembly 22 can be provided with a first connecting structure 31, and the first connecting structure 31 is used to connect to at least one of the front cabin assembly 21 and the rear floor assembly 23, and the first connecting structure 31 can be disassembled and assembled in the up and down directions.

[0121] The first connecting structure 31 can be disassembled and assembled in the up and down directions. The first connecting structure 31 is formed as a Z-direction connecting structure, so that the first connecting structure 31 can be disassembled from the lower side of the lower body 20 without being interfered with by other structures of the upper body 10 and the lower body 20, thereby facilitating the separate disassembly of the battery assembly 22 and making the operation more convenient.

[0122] It should be noted that the first connecting structure 31 is assembled and disassembled along the up-down direction, where the up-down direction can be parallel to the vertical direction or at a certain angle to the vertical direction, as long as the first connecting structure 31 can be disassembled from the bottom.

[0123] In some embodiments, please refer to Figure 5, a first seal 42 is provided between the upper surface of the front portion of the battery assembly 22 and the front compartment assembly 21, and the first seal 42 seals the gap between the battery assembly 22 and the front compartment assembly 21; a second seal 43 is provided between the upper surface of the rear portion of the battery assembly 22 and the rear floor assembly 23, and the second seal 43 seals the gap between the rear floor assembly 23 and the battery assembly 22.

[0124] By providing the first sealing member 42 and the second sealing member 43 , the sealing between the components of the lower vehicle body 20 can be improved, thereby facilitating the improvement of the sealing of the engine compartment and the trunk compartment.

[0125] Furthermore, the first seal 42 is located vertically between the battery assembly 22 and the front compartment assembly 21. The first connecting structure 31 provides a compressive force to the first seal 42 when vertically connecting the battery assembly 22 and the front compartment assembly 21. This not only improves the sealing effect but also increases the stability and service life of the first seal 42. Similarly, the second seal 42 is in sealing contact with the upper surface of the battery assembly 22, and the first connecting structure 31 can also be used to improve the sealing effect and stability.

[0126] In the embodiment of the present application, the specific structure of the first connecting structure 31 can be flexibly set, and it only needs to be able to be disassembled and assembled in the up and down directions.

[0127] For example, in some specific embodiments, the first connecting structure 31 is fixed to the battery assembly 22 and can be connected from bottom to top to the front compartment assembly 21 or the rear floor assembly 23. Thus, the first connecting structure 31 can move up and down synchronously with the battery assembly 22, allowing the battery assembly 22 to be removed from the front compartment assembly 21 or the rear floor assembly 23 while being disconnected from the battery assembly 22, thereby improving assembly and disassembly efficiency.

[0128] For example, the first connecting structure 31 can be a buckle fixed to the battery assembly 22. Moving the battery assembly 22 upward can simultaneously snap the buckle into the front cabin assembly 21 or the rear floor assembly 23, and moving the battery assembly 22 downward can simultaneously release the buckle from the front cabin assembly 21 or the rear floor assembly 23; the first connecting structure 31 can also include a motor and a bolt connected to the output end of the motor. The motor is installed on the battery assembly 22, and the motor can drive the bolt to rotate. The rotation of the bolt can realize threaded connection and release with the front cabin assembly 21 or the rear floor assembly 23.

[0129] For example, in some specific embodiments, referring to Figures 5-7 , Figure 6 is a schematic diagram of the structure of the battery assembly 22 provided in an embodiment of the present application, and Figure 7 is a schematic diagram of the partial structure of the battery assembly 22 and the upper vehicle body 10 provided in an embodiment of the present application. The first connection structure 31 includes a first fastener 311 and a first mounting hole 312 provided in the battery assembly 22. The first mounting hole 312 extends in the vertical direction. The first fastener 311 is upwardly inserted through the first mounting hole 312 and connected to the front compartment assembly 21 or the rear floor assembly 23. The first fastener 311 includes, but is not limited to, bolts, studs, etc.

[0130] The first fastener 311 can be operated from the lower side of the lower body 20 during disassembly. The first fastener 311 moves downward and does not interfere with the upper body 10, the front cabin assembly 21, the rear floor assembly 23 and other structures above, thereby facilitating the separate disassembly and assembly of the battery assembly 22. The first fastener 311 can also improve the connection strength between the battery assembly 22 and the front cabin assembly 21 or the rear floor assembly 23.

[0131] The extension length of the first mounting hole 312 in the up and down directions can be flexibly set. For example, in an area where the battery assembly 22 has smaller dimensions in the up and down directions, the first mounting hole 312 can pass through the upper and lower surfaces of the battery assembly 22, thereby better improving the connection strength.

[0132] In some specific embodiments, the battery assembly 22 is provided with a first avoidance hole located below and connected to the first mounting hole 312. The diameter of the first avoidance hole is larger than the outer diameter of the first fastener 311. During assembly, the first fastener 311 can pass upward through the first avoidance hole and then be inserted into the first mounting hole 312. The first fastener 311 does not engage securely with the wall of the avoidance hole 227. As a result, the vertical length of the first fastener 311 is smaller than the vertical dimension of the battery assembly 22, which facilitates reducing the size of the first fastener 311 while ensuring connection strength requirements. The first avoidance hole also avoids the first fastener 311, ensuring that the first fastener 311 can be installed and removed without interference.

[0133] In some specific embodiments, as shown in FIG7 , the housing 202 of the battery assembly 22 includes a side beam and a reinforcing beam disposed on the outer side of the side beam, wherein the side beam has a larger dimension in the vertical direction than the reinforcing beam. A first mounting hole 312 on the reinforcing beam passes through the upper and lower surfaces of the reinforcing beam, and a first relative avoidance hole is disposed below the first mounting hole 312 on the side beam. The first mounting holes 312 can be disposed at different sizes of the battery assembly 22. The first mounting holes 312 that are not opposite to the first avoidance hole can be disposed in an area of ​​the battery assembly 22 that is smaller in the vertical direction, with the screw head of the first fastener 311 abutting against the lower surface of the battery assembly 22. The first mounting holes 312 that are opposite to the first avoidance hole can be disposed in an area of ​​the battery assembly 22 that is larger in the vertical direction, with the screw head of the first fastener 311 located within the first avoidance hole and abutting against the edge of the first mounting hole 312. As a result, the sizes of the first fasteners 311 in the first mounting holes 312 at different sizes of the battery assembly 22 are relatively close or equal, which can not only ensure the connection stability, but also help to improve the versatility of the first fasteners 311 and reduce costs.

[0134] According to some embodiments of the present application, as shown in Figures 5 to 7, a second connecting structure 32 is provided in the middle of the battery assembly 22, the second connecting structure 32 is connected to the upper body 10, and the second connecting structure 32 can be disassembled and assembled in the up and down directions.

[0135] The second connecting structure 32 is formed as a Z-connection structure, allowing it to be removed from the underside of the lower body 20 during disassembly without interference from other structures of the upper body 10 and lower body 20. This facilitates the independent removal of the battery assembly 22 and makes the operation more convenient. In addition, the first connecting structure 31 and the second connecting structure 32 cooperate to connect and secure the battery assembly 22 at the front, middle, and rear of the battery assembly 22, improving the connection reliability of the battery assembly 22.

[0136] In some embodiments, the second connecting structure 32 is fixed to the battery assembly 22 and is adapted to connect to the upper vehicle body from bottom to top. This allows the second connecting structure 32 to move up and down synchronously with the battery assembly 22, allowing the battery assembly 22 to be removed from the upper vehicle body 10 while simultaneously moving downward, thereby improving assembly and disassembly efficiency. For example, the second connecting structure 32 may be a buckle, or may include a motor and bolts connected to the motor's output terminal.

[0137] In some embodiments, as shown in Figures 5-7 , the second connection structure 32 includes a second fastener 321 and a second mounting hole 322 provided in the battery assembly 22. The second mounting hole 322 extends in the vertical direction. The second fastener 321 is upwardly inserted through the second mounting hole 322 and connected to the upper body 10. The second fastener 321 includes, but is not limited to, bolts, studs, and the like.

[0138] The second fastener 321 can be operated from the lower side of the lower body 20 during disassembly. The second fastener 321 moves downward and does not interfere with the upper body 10, the front cabin assembly 21, the rear floor assembly 23 and other structures above, thereby facilitating the separate disassembly and assembly of the battery assembly 22. The second fastener 321 can also improve the connection strength between the battery assembly 22 and the upper body 10.

[0139] In some embodiments including a second mounting hole 322, as shown in FIG7 , the second mounting hole 322 may extend through the upper and lower surfaces of the battery assembly 22, or a second avoidance hole 227 may be provided below the second mounting hole 322. Second mounting holes 322 not opposite second avoidance holes 227 may be provided in a smaller area of ​​the battery assembly 22 in the vertical direction, with the screw head of the second fastener 321 abutting against the lower surface of the battery assembly 22. Second mounting holes 322 opposite second avoidance holes 227 may be provided in a larger area of ​​the battery assembly 22 in the vertical direction. This ensures that the dimensions of the second fasteners 321 within second mounting holes 322 of different battery assembly sizes are relatively similar or equal, ensuring connection stability while also improving the versatility of the second fasteners 321 and reducing costs.

[0140] In some embodiments, as shown in Figures 5 and 7, the vehicle body structure 100 includes a third seal 41, which extends along the circumference of the passenger compartment and seals the gap between the lower body 20 and the upper body 10, the front portion of the third seal 41 is sealed with the front compartment assembly 21, the middle portion of the third seal 41 is sealed with the middle portion of the battery assembly 22, and the rear portion of the third seal 41 is sealed with the rear floor assembly 23.

[0141] For example, as shown in Figure 5 , the third seal 41 comprises a first sealing portion 411, a second sealing portion 412, and a third sealing portion 413, forming a complete seal extending circumferentially along the passenger compartment, providing excellent sealing performance. The first sealing portion 411 seals the gap between the upper surface of the front compartment assembly 21 and the upper vehicle body 10; the second sealing portion 412 seals the gap between the upper surface of the rear floor assembly 23 and the upper vehicle body 10; and the third sealing portion 413 seals the gap between the middle portion of the battery assembly 22 and the upper vehicle body 10, specifically forming a sealing contact with the upper surfaces of the left and right side rails of the frame 222.

[0142] The third seal 41 ensures a seal between the upper body 10 and the lower body 20, preventing water, dust, and other intrusions into the passenger compartment. The third seal 41 is located vertically between the upper body 10 and the lower body 20. The second connection structure 32, connecting the battery assembly 22 and the upper body 10, provides a compressive force to the third seal 41, enhancing the sealing effect, stability, and service life of the third seal 41.

[0143] In some embodiments including a first seal 42, a second seal 43 and a third seal 41, please refer to Figure 5, the third sealing portion 413 of the third seal 41 can be located between the first seal 42 and the second seal 43, and sealedly connected to the first seal 42 and the second seal 43, which is conducive to further improving the sealing effect.

[0144] Regarding the first sealing member 42 , the second sealing member 43 and the third sealing member 41 , please refer to FIG. 5 . The specific structures of the first sealing member 42 , the second sealing member 43 and the third sealing member 41 can be flexibly set.

[0145] For example, in some embodiments, at least one of the first seal 42, the second seal 43, and the third seal 41 may be an elastic sealing ring, which is used to pressurize the battery assembly 22. An elastic sealing ring is a sealing ring that can undergo elastic deformation and may be made of, for example, rubber, silicone, or other materials. The elastic sealing ring is compressed by the pressure generated between the battery assembly 22 and the front compartment assembly 21, between the battery assembly 22 and the rear floor assembly 23, and between the lower body 20 and the upper body 10, thereby improving the sealing effect. When the battery assembly 22 needs to be disassembled, the pressure on the elastic sealing ring can be released by releasing the fixing structure of the battery assembly 22. The elastic sealing ring can then be separated from the battery assembly 22, the front compartment assembly 21, the rear floor assembly 23, or the upper body 10, making it easier to disassemble and assemble the battery assembly 22.

[0146] For another example, in some embodiments, as shown in FIG5 , at least one of the first sealing member 42, the second sealing member 43, and the third sealing member 41 may be an adhesive, which is used to bond with the battery assembly 22. The adhesive is sticky, enabling a better seal and preventing misalignment during assembly that could affect the seal. When the battery assembly 22 needs to be disassembled, the adhesive can be removed by tearing it off without affecting the disassembly of the battery assembly 22.

[0147] Furthermore, in the embodiment where the third sealing member 41 is connected to the first sealing member 42 or the second sealing member 43 , the connection can be achieved by utilizing the viscosity of the adhesive, which is beneficial to improving the sealing performance of the connection.

[0148] In some specific embodiments, the adhesive may be a weak adhesive, that is, an adhesive with relatively weak viscosity, which can achieve sealing while reducing the difficulty of tearing and removing. For example, the weak adhesive may be butyl putty.

[0149] The first sealing member 42 , the second sealing member 43 and the third sealing member 41 may be of the same type or different types, for example, all of them may be elastic sealing rings or all of them may be adhesives, for example, one may be an elastic sealing ring and the other two may be adhesives.

[0150] In some specific embodiments, at least one of the first sealing member 42 and the second sealing member 43 may be adhesive, and the adhesive may be the same type as the adhesive of the third sealing member 41, such as butyl cement. Adhesives of the same type blend better with each other, improving the sealing of the joint and facilitating improved sealing of the battery assembly 22 after assembly and disassembly.

[0151] The battery assembly 22 according to some embodiments of the present application is described below with reference to the accompanying drawings.

[0152] According to some embodiments of the present application, referring to FIG6 , the battery assembly 22 includes a housing 202 and battery cells disposed within the housing 202 . The housing 202 includes a frame 222 and a bottom plate 226 . The periphery of the bottom plate 226 is connected to the lower end of the frame 222 , thereby defining a space for accommodating the battery cells and providing shielding and protection for the battery cells. Components used to install the battery assembly 22 can be connected to the frame 222 , such as the upper body 10 , the front cabin assembly 21 , and the rear floor assembly 23 , so that the battery assembly 22 can be installed from the edge, which helps to improve the stability of the installation of the battery assembly 22 .

[0153] The frame 222 and the bottom plate 226 may be separate parts connected together, or may be an integrally formed part. Connection methods include, but are not limited to, fastener connection, welding, bonding, and the like.

[0154] In addition, the frame 222 includes a sill beam 224. The sill beam 224 is a very important protective component of the vehicle, which can effectively resist external intrusion in the event of a side collision of the vehicle, protect the integrity of the passenger compartment, and reduce injuries to the passengers in the vehicle.

[0155] The frame 222 includes a threshold beam 224. In other words, the threshold beam 224 is connected to the frame wall of the frame 222 to improve the overall structural strength of the box 202; or the threshold beam 224 directly serves as the frame wall of the frame 222 to reduce the number of components of the battery assembly 22, reduce the space occupied by the box 202 to improve energy density, and reduce the weight of the entire vehicle.

[0156] It should be noted that the upper end of the frame 222 may have an upper opening, which may be sealed by the upper body 10 or by other structural covers of the battery assembly 22, both of which may place the battery cells in a relatively closed space.

[0157] For example, the top of the frame 22 is open, forming a coverless battery. The battery cells of the coverless battery can be arranged upright, that is, the electrical connection part of the battery cell is located on the upper side, so that the coverless battery can adapt to different occasions.

[0158] In some embodiments, as shown in Figures 6 and 7, the housing 202 further includes a cover 225, the periphery of which is connected to the upper end of the frame 222. This facilitates sealing the upper end of the frame 222 through the cover 225 before the battery assembly 22 is mated with the upper vehicle body 10, thereby improving sealing effectiveness and ease of operation.

[0159] In some specific embodiments, as shown in Figures 6 and 7 , the upper cover 225 includes a front floor. In other words, the front floor is integrated with the battery assembly 22 and can be assembled and disassembled along with the battery assembly 22. This helps reduce the number of components in the cover 225. For example, the front floor is directly connected to the frame 222 without the need for additional cover structures, thereby reducing the space and weight occupied by the box 202 and improving energy density.

[0160] In some embodiments, as shown in Figures 6 and 7, the bottom plate 226 includes a bottom guard plate. In other words, the bottom guard plate is integrated into the battery assembly 22 and is assembled and disassembled along with the battery assembly 22. This improves the bottom of the battery assembly 22's ability to withstand penetration. Furthermore, it helps reduce the number of components in the bottom plate 226. For example, the bottom guard plate directly covers the lower opening of the frame 222, eliminating the need for a separate cover structure. This reduces the space and weight of the box 202 and improves energy density.

[0161] The vehicle according to the third embodiment of the present application includes the vehicle body structure 100 according to the above-described embodiment of the present application. Thus, by adopting the above-described vehicle body structure 100, the battery assembly 22 is integrated into the lower body 20, which helps reduce the number of parts and the total weight of the lower body 20. Furthermore, because the battery assembly 22 is independently removable relative to the front compartment assembly 21 and the rear floor assembly 23, when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be removed, without having to remove the front compartment assembly 21 and the rear floor assembly 23 together. This greatly improves the convenience of assembly and disassembly, helps improve replacement and repair efficiency, and enhances the user experience.

[0162] Fourthly, the present application also proposes a method for disassembling and assembling the lower body 20. The lower body 20 is the lower body 20 of the above-mentioned body structure 100. The relevant operations and structures of the above-mentioned body structure 100 and the lower body 20 can be introduced into the disassembly and assembly method of this embodiment, which will not be repeated here.

[0163] As shown in FIG8 , the disassembly method includes a disassembly process of disassembling the battery assembly 22 separately, and the disassembly process may include:

[0164] Release the connection between the battery assembly 22 and the front compartment assembly 21, the rear floor assembly 23 and the upper vehicle body 10;

[0165] The battery assembly 22 is moved downward, and the seals between the battery assembly 22 and the front compartment assembly 21, the rear floor assembly 23 and the upper vehicle body 10 are released, so as to achieve separate disassembly of the battery assembly 22.

[0166] For example, the first fastener 311 for connecting the front cabin assembly 21 and the battery assembly 22, the first fastener 311 for connecting the rear floor assembly 23 and the battery assembly 22, and the second fastener 321 for connecting the upper body 10 and the battery assembly 22 can be removed downward to release the connection between the battery assembly 22 and the front cabin assembly 21, the rear floor assembly 23 and the upper body 10 respectively. The disassembly process is not blocked or interfered with by other components, and there is no need to disassemble the connection between the front cabin assembly 21 and the upper body 10, and the rear floor assembly 23 and the upper body 10.

[0167] When the battery assembly 22 is moved downward, the first seal 42 between the front compartment assembly 21 and the battery assembly 22, the second seal 43 between the rear floor assembly 23 and the battery assembly 22, and the third seal 413 between the upper body 10 and the battery assembly 22 are torn, thereby releasing the seals. However, the first seal 411 between the front compartment assembly 21 and the upper body 10 and the second seal 412 between the rear floor assembly 23 and the upper body 10 can remain sealed.

[0168] According to the method for disassembling and assembling the lower body 20 of the embodiment of the present application, the battery assembly 22 is integrated into the lower body 20, which helps reduce the number of parts and the total weight of the vehicle body structure 100. Furthermore, when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be removed, without removing the front compartment assembly 21 and the rear floor assembly 23. This greatly improves the convenience of assembly and disassembly, helps improve replacement and repair efficiency, and enhances the user experience.

[0169] In some embodiments, as shown in FIG5 and FIG7 , the disassembly and assembly method further includes a reassembly process of the battery assembly 22 , and the reassembly process includes:

[0170] A sealing member 40 is provided on the battery assembly 22 and extends along the circumference of the battery assembly 22 ;

[0171] The battery assembly 22 is installed from bottom to top on the front compartment assembly 21, the rear floor assembly 23 and the upper body 10, and is sealed with the front compartment assembly 21 by the front of the seal 40, sealed with the rear floor assembly 23 by the rear of the seal 40, and sealed with the upper body 10 by the middle of the seal 40.

[0172] For example, adhesive can be applied around the circumference of the battery assembly 22 to form a seal 40. The seal 40 can include a ring-shaped seal 42, a second seal 43, and a third seal portion 413. After the battery assembly 22 is reinstalled on the integrated structure of the front compartment assembly 21, the rear floor assembly 23, and the upper body 10, the front portion of the seal 40 becomes the first seal 42, sealing the gap between the front compartment assembly 21 and the battery assembly 22. The middle portion of the seal 40 becomes the third seal portion 413, sealing the gap between the battery assembly 22 and the upper body 10. The rear portion of the seal 40 becomes the second seal 43, sealing the gap between the rear floor assembly 23 and the battery assembly 22. Furthermore, the middle portion of the seal 40 can be reconnected to the remaining first seal portion 411 and second seal portion 412 to form a complete seal around the passenger compartment, improving sealing performance.

[0173] By providing the seal 40 , it is beneficial to improve the sealing performance of the mating parts after the battery assembly 22 is reassembled, thereby improving the sealing effect of the battery assembly 22 , the engine compartment, the passenger compartment and the vehicle body structure 100 .

[0174] Fifthly, the present application also proposes a method for disassembling and assembling the lower body 20. The lower body 20 is the lower body 20 of the above-mentioned body structure 100. The relevant operations and structures of the above-mentioned body structure 100 and the lower body 20 can be introduced into the disassembly and assembly method of this embodiment, which will not be repeated here.

[0175] The disassembly and assembly method includes an assembly process of the lower vehicle body 20, and the assembly process includes:

[0176] A first sealing member 42 is provided at the front of the battery assembly 22 , and a second sealing member 43 is provided at the rear of the battery assembly 22 ;

[0177] The battery assembly 22 is detachably installed between the front compartment assembly 21 and the rear floor assembly 23, and the first seal 42 seals the gap between the front of the battery assembly 22 and the front compartment assembly 21, and the second seal 43 seals the gap between the rear of the battery assembly 22 and the rear floor assembly 23.

[0178] By setting a first seal 42 between the front cabin assembly 21 and the battery assembly 22, and setting a second seal 43 between the rear floor assembly 23 and the battery assembly 22, it is beneficial to improve the sealing of the fitting of the battery assembly 22, thereby improving the sealing effect of the battery assembly 22, the cabin and the lower body 20.

[0179] For example, the battery assembly 22 can be connected to the front compartment assembly 21 and the rear floor assembly 23 through the first connecting structure 31, which facilitates the subsequent separate disassembly of the battery assembly 22.

[0180] According to the method for disassembling and assembling the lower body 20 in the above embodiment, the battery assembly 22 is integrated into the lower body 20, which helps reduce the number of parts and the total weight of the vehicle body structure 100. Furthermore, when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be removed, without removing the front compartment assembly 21 and the rear floor assembly 23. This greatly improves assembly and disassembly convenience, helps improve replacement and repair efficiency, and enhances the user experience.

[0181] In some embodiments, the disassembly and assembly method includes an assembly process of installing the lower vehicle body 20 on the upper vehicle body 10, and the assembly process includes:

[0182] A third sealing member 41 is provided on the upper side of the lower body 20 and extends around the passenger compartment;

[0183] The lower body 20 is mounted upward on the lower side of the upper body 10 , and the third seal 41 seals the gap between the upper body 10 and the lower body 20 .

[0184] In the above embodiment, the third sealing member 41 can seal the space between the upper vehicle body 10 and the lower vehicle body 20, thereby improving the sealing performance of the periphery of the bottom of the passenger compartment and enhancing the waterproof and dustproof effects.

[0185] In addition, in the embodiment where adhesive is applied to form the third seal 41 , the third seal 41 can be connected to the rear end of the first seal 42 and the front end of the second seal 43 of the lower body 20 to improve the sealing effect of the entire vehicle.

[0186] Furthermore, the disassembly and assembly method of the lower body 20 may include a disassembly process of disassembling the battery assembly 22 alone, and the disassembly process includes:

[0187] Release the connection between the battery assembly 22 and the front compartment assembly 21, the rear floor assembly 23 and the upper vehicle body 10;

[0188] The battery assembly 22 is moved downward, and the seals between the battery assembly 22 and the front compartment assembly 21, the rear floor assembly 23 and the upper vehicle body 10 are released, so as to achieve separate disassembly of the battery assembly 22.

[0189] In the above embodiment, the battery assembly 22 can be disassembled separately without disassembling the front compartment assembly 21, the rear floor assembly 23 and the upper body 10, which greatly improves the convenience of disassembly and assembly, is conducive to improving replacement and maintenance efficiency, and improves user experience.

[0190] The vehicle body structure 100 according to some specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0191] Referring to Figures 1-7, a vehicle body structure 100 according to some specific embodiments of the present application includes an upper body 10 and a lower body 20. The lower body 20 comprises a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23, forming a three-section front-to-back structure. The front cabin assembly 21 and the battery assembly 22 are connected from bottom to top by bolts, and the rear floor assembly 23 and the battery assembly 22 are connected from bottom to top by bolts, allowing the battery assembly 22 to be subsequently removed without obstruction. The front cabin assembly 21 and the battery assembly 22, as well as the rear floor assembly 23 and the battery assembly 22, are sealed using weak connections made of butyl cement. The upper body 10 and the lower body 20 are connected from bottom to top using weak connections made of butyl cement and bolts, achieving airtightness and watertightness in the passenger compartment.

[0192] The specific disassembly and assembly process of the vehicle body structure 100 includes:

[0193] Assemble the front cabin assembly 21, battery assembly 22, and rear floor assembly 23. Apply butyl putty at the connection between the front cabin assembly 21 and the battery assembly 22, and at the connection between the rear floor assembly 23 and the battery assembly 22, and connect them with bolts.

[0194] Butyl cement is applied to the connection between the lower body 20 and the upper body 10 and connected by bolts to obtain the body structure 100, which is convenient for subsequent assembly into a complete vehicle. The two applications of butyl cement are mutually melted and solidified.

[0195] When the battery assembly 22 needs to be repaired, lift the entire vehicle and lift the battery assembly 22 area from the bottom;

[0196] Remove the bolts associated with the battery assembly 22 so that the battery assembly 22 is independently decoupled and the corresponding seals 40 around the battery assembly 22 are destroyed;

[0197] When reassembling, apply butyl putty in a closed loop on the battery assembly 22, and increase the amount of butyl putty at the joints with the first sealing part 411 and the second sealing part 412 that have not been disassembled;

[0198] Move the battery assembly 22 to a position that matches the upper vehicle body 10 , tighten the bolts to secure the battery assembly 22 , and complete the installation.

[0199] In the above embodiment, the battery assembly 22 can be independently decoupled and disassembled, which is convenient for later maintenance and replacement, and the battery assembly 22 can achieve good air-tightness and water-tightness when installed.

[0200] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0201] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A lower body of a vehicle body structure, wherein: The lower body includes: a front cabin assembly, a battery assembly and a rear floor assembly. The front part of the battery assembly is detachably matched with the front cabin assembly and the rear part is detachably matched with the rear floor assembly. The battery assembly is suitable for being separately detachably matched with the upper body of the vehicle body structure relative to the front cabin assembly and the rear floor assembly.

2. The lower body of the vehicle body structure according to claim 1, wherein: The front portion of the battery assembly abuts against the front compartment assembly, and / or the rear portion of the battery assembly abuts against the rear floor assembly.

3. The lower body of the vehicle body structure according to claim 1 or 2, wherein: The front compartment assembly includes a first connection portion, the first connection portion is located on one side of the front portion of the battery assembly along the left-right direction, and a first connection member is detachably provided between the first connection portion and the battery assembly along the left-right direction; the rear floor assembly includes a second connection portion, the second connection portion is located on one side of the rear portion of the battery assembly along the left-right direction, and a second connection member is detachably provided between the second connection portion and the battery assembly along the left-right direction.

4. The lower body of the vehicle body structure according to claim 3, wherein: A first seal is provided between the side surface of the front portion of the battery assembly and the first connecting portion; and a second seal is provided between the side surface of the rear portion of the battery assembly and the second connecting portion.

5. The lower body of the vehicle body structure according to claim 1 or 2, wherein: The front portion of the battery assembly is located below the front compartment assembly, and the rear portion is located below the rear floor assembly. The battery assembly is provided with a first connection structure, which is used to connect to at least one of the front compartment assembly and the rear floor assembly. The first connection structure is suitable for disassembly and assembly in the up and down directions.

6. The lower body of the vehicle body structure according to claim 5, wherein: A first seal is provided between the upper surface of the front portion of the battery assembly and the front compartment assembly; a second seal is provided between the upper surface of the rear portion of the battery assembly and the rear floor assembly.

7. The lower body of the vehicle body structure according to claim 5 or 6, wherein: The first connection structure is fixed to the battery assembly and is suitable for connecting to the front compartment assembly or the rear floor assembly from bottom to top.

8. The lower body of the vehicle body structure according to claim 5 or 6, wherein: The first connection structure includes a first fastener and a first mounting hole provided on the battery assembly, the first mounting hole extends up and down, the first fastener passes upward through the first mounting hole and is connected to the front compartment assembly or the rear floor assembly.

9. The lower body of the vehicle body structure according to claim 8, wherein: The battery assembly is provided with a first avoidance hole located below the first mounting hole and connected to the first mounting hole, and the aperture of the first avoidance hole is larger than the outer diameter of the first fastener.

10. The lower body of the vehicle body structure according to claim 4 or 6, wherein: The first sealing member and / or the second sealing member is an elastic sealing ring, and the elastic sealing ring is used for press-fitting with the battery assembly.

11. The lower body of the vehicle body structure according to claim 4 or 6, wherein: The first sealing member and / or the second sealing member is adhesive, and the adhesive is used to bond with the battery assembly.

12. The lower body of the vehicle body structure according to claim 11, wherein: The material of the adhesive includes butyl glue.

13. The lower body of the vehicle body structure according to any one of claims 1 to 12, wherein: The battery assembly includes a box body and a battery cell arranged in the box body, and the box body includes: A frame, the frame comprising a sill beam, the front cabin assembly and the rear floor assembly being respectively connected to the frame; A bottom plate, the periphery of which is connected to the lower end of the frame.

14. The lower body of the vehicle body structure according to claim 13, wherein: The box body also includes a cover body, and the periphery of the cover body is connected to the upper end of the frame body.

15. The lower body of the vehicle body structure according to claim 14, wherein: The cover body includes a front floor.

16. A vehicle body structure, wherein: The vehicle body comprises an upper vehicle body and a lower vehicle body of the vehicle body structure according to any one of claims 1 to 15, wherein the lower vehicle body is mounted on the lower side of the upper vehicle body to cooperate to define a passenger compartment.

17. The vehicle body structure according to claim 16, wherein: The upper surface of at least a portion of the side wall of the battery assembly includes a mating surface, and the mating surface abuts against the upper vehicle body.

18. The vehicle body structure according to claim 17, wherein: The side wall is provided with a plurality of the matching surfaces, and the plurality of the matching surfaces are arranged along the inner and outer directions of the side wall and are staggered in height along the upper and lower directions.

19. The vehicle body structure according to any one of claims 16 to 17, wherein: A second connection structure is provided in the middle of the battery assembly, and the second connection structure is connected to the upper vehicle body and is suitable for disassembly and assembly along the up and down directions.

20. The vehicle body structure according to claim 19, wherein: The second connection structure includes a second fastener and a second mounting hole provided on the battery assembly, the second mounting hole extends in the up-down direction, and the second fastener is upwardly passed through the second mounting hole and connected to the upper vehicle body.

21. The vehicle body structure according to claim 19, wherein: The second connection structure is fixed to the battery assembly and is suitable for being connected to the upper vehicle body from bottom to top.

22. The vehicle body structure according to any one of claims 16 to 21, wherein: A third seal is included, which extends along the circumference of the passenger compartment and seals the gap between the lower body and the upper body, the front portion of the third seal is sealed with the front compartment assembly, the middle portion of the third seal is sealed with the middle portion of the battery assembly, and the rear portion of the third seal is sealed with the rear floor assembly.

23. A vehicle, wherein: Comprising a vehicle body structure as claimed in any one of claims 16-22.

24. A method for disassembling and assembling a lower vehicle body, wherein: The lower vehicle body is the lower vehicle body of the vehicle body structure according to any one of claims 1 to 15, and the disassembly method includes a disassembly process of disassembling the battery assembly separately, and the disassembly process includes: Disconnect the battery assembly from the front compartment assembly, the rear floor assembly and the upper body; The battery assembly is moved downward, and the seals between the battery assembly and the front compartment assembly, the rear floor assembly and the upper vehicle body are released, so as to realize the separate disassembly of the battery assembly.

25. The method for disassembling and assembling the lower vehicle body according to claim 24, wherein: The disassembly and assembly method includes a reassembly process of the battery assembly, and the reassembly process includes: A sealing member is provided on the battery assembly and extends along the circumference of the battery assembly; The battery assembly is installed from bottom to top on the front compartment assembly, the rear floor assembly and the upper vehicle body, and is sealed with the front compartment assembly through the front portion of the seal, with the rear floor assembly through the rear portion of the seal, and with the upper vehicle body through the middle portion of the seal.

26. A method for disassembling and assembling a lower vehicle body, wherein: The lower vehicle body is the lower vehicle body of the vehicle body structure according to any one of claims 1 to 15, and the disassembly and assembly method includes an assembly process of the lower vehicle body, and the assembly process includes: Disposing a first sealing member at the front of the battery assembly and a second sealing member at the rear of the battery assembly; The battery assembly is detachably installed between the front compartment assembly and the rear floor assembly, and the first seal seals the gap between the front of the battery assembly and the front compartment assembly, and the second seal seals the gap between the rear of the battery assembly and the rear floor assembly.

27. The method for disassembling and assembling the lower vehicle body according to claim 26, wherein: The disassembly and assembly method includes an assembly process of installing the lower vehicle body on the upper vehicle body, and the assembly process includes: A third sealing member extending around the passenger compartment is provided on the upper side of the lower body; The lower body is mounted upward on the lower side of the upper body, and the third seal seals a gap between the lower body and the upper body.

28. The method for disassembling and assembling the lower vehicle body according to claim 26, wherein: The disassembly method includes a disassembly process of disassembling the battery assembly separately, and the disassembly process includes: Disconnecting the battery assembly from the front compartment assembly, the rear floor assembly, and the upper vehicle body; The battery assembly is moved downward, and the seals between the battery assembly and the front compartment assembly, the rear floor assembly and the upper vehicle body are released, so as to realize the separate disassembly of the battery assembly.

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