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

Abstract

The invention discloses a lower vehicle body of a vehicle body structure, a dismounting method thereof, the vehicle body structure and a vehicle. The lower vehicle body comprises a front cabin assembly, a battery assembly and a rear floor assembly, the front portion of the battery assembly is detachably matched with the front cabin assembly, and the rear portion of the battery assembly is detachably matched with the rear floor assembly. The battery assembly is suitable for being independently and detachably matched with an upper vehicle body of the vehicle body structure relative to the front cabin assembly and the rear floor assembly. According to the technical scheme, the battery assembly is integrated on the lower vehicle body, the number of parts can be reduced, and the total weight of the lower vehicle body is reduced. In addition, the battery assembly can be independently detached relative to the front cabin assembly and the rear floor assembly, when the battery assembly needs to be maintained and replaced, only the battery assembly needs to be detached, and the front cabin assembly and the rear floor assembly do not need to be detached together, so that the detaching convenience is greatly improved, the replacement and maintenance efficiency is improved, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a lower vehicle body of a vehicle body structure, a disassembly and assembly method thereof, a vehicle body structure, and a vehicle. Background Art

[0002] The battery-body integration technology (i.e., CTC technology), which integrates the battery pack and the chassis together, has become a major technical field for research and development to improve efficiency and reduce costs. However, the integrated design makes the disassembly and assembly operation of the battery pack complex and is not conducive to after-sales maintenance. Summary of the Invention

[0003] An embodiment of the present invention provides a lower vehicle body of a vehicle body structure, which facilitates the maintenance and replacement of the battery assembly.

[0004] In a first aspect, an embodiment of the present invention provides a lower vehicle body of a vehicle body structure, including: a front cabin assembly, a battery assembly, and a rear floor assembly. The front part of the battery assembly is detachably engaged with the front cabin assembly, and the rear part is detachably engaged with the rear floor assembly. The battery assembly is adapted to be detachably engaged with the upper vehicle body of the vehicle body structure relative to the front cabin assembly and the rear floor assembly separately and removably.

[0005] In the above technical solution, the integration of the battery assembly into the lower vehicle body is beneficial to reducing the number of components and the total weight of the lower vehicle body. And by the battery assembly being independently removable relative to the front cabin assembly and the rear floor assembly, when the battery assembly needs to be maintained and replaced, only the battery assembly needs to be removed, and it is not necessary to remove the front cabin assembly and the rear floor assembly together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and maintenance efficiency, and improves the user experience.

[0006] In some embodiments, the front part of the battery assembly abuts against the front cabin assembly, and / or the rear part of the battery assembly abuts against the rear floor assembly.

[0007] In the above technical solution, the connection strength of the battery assembly can be improved by abutting.

[0008] In some embodiments, the front cabin assembly includes a first connection part, the first connection part is located on one side of the front part of the battery assembly in the left-right direction, and a first connecting piece is detachably passed through the first connection part and the battery assembly in the left-right direction; the rear floor assembly includes a second connection part, the second connection part is located on one side of the rear part of the battery assembly in the left-right direction, and a second connecting piece is detachably passed through the second connection part and the battery assembly in the left-right direction.

[0009] In the above technical solution, the disassembly and assembly of the first connecting member and the second connecting member can be carried out from the side of the vehicle body structure without interfering with the connection between the front cabin assembly and the upper vehicle body, and there is no need to disassemble the front cabin assembly and the rear floor assembly.

[0010] In some embodiments, a first seal is provided between the side surface of the front part of the battery assembly and the first connecting portion; a second seal is provided between the side surface of the rear part of the battery assembly and the second connecting portion.

[0011] In the above technical solution, the sealing performance between different components of the lower vehicle body can be improved through the first seal and the second seal, which is beneficial to improving the sealing performance of the engine compartment and the trunk compartment.

[0012] In some embodiments, the front part of the battery assembly is located below the front cabin assembly, and the rear part is located below the rear floor assembly. The battery assembly is provided with a first connection structure for connecting with at least one of the front cabin assembly and the rear floor assembly, and the first connection structure is adapted to be disassembled and assembled in the vertical direction.

[0013] In the above technical solution, the first connection structure can be disassembled from the lower side. After the connection of the first connection structure is released, the battery assembly can be directly moved downward to be separated from the upper vehicle 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.

[0014] In some embodiments, a first seal is provided between the upper surface of the front part of the battery assembly and the front cabin assembly; a second seal is provided between the upper surface of the rear part of the battery assembly and the rear floor assembly.

[0015] In the above technical solution, by providing the first seal and the second seal, the sealing performance between the components of the lower vehicle body can be improved, which is beneficial to improving the sealing performance of the engine compartment and the trunk compartment; and the first connection structure and the second connection structure can improve the sealing effect and stability of the first seal and the second seal.

[0016] In some embodiments, the first connection structure is fixedly provided on the battery assembly and is adapted to be connected to the front cabin assembly or the rear floor assembly from bottom to top.

[0017] In the above technical solution, the first connection structure can move up and down synchronously with the battery assembly. When the connection of the battery assembly is released, the battery assembly can be moved out downward, which is beneficial to improving the disassembly and assembly efficiency.

[0018] 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 vertically, and the first fastener passes upward through the first mounting hole and is connected to the front compartment assembly or the rear floor assembly.

[0019] In the above technical solution, the first fastener can be operated from the lower side of the lower vehicle body during both the disassembly and assembly processes. When disassembling, the first fastener is moved downward and there is no positional interference with the upper structures, facilitating the separate disassembly and assembly of the battery assembly, and the first fastener can improve the connection strength of the battery assembly.

[0020] In some embodiments, the battery assembly is provided with a first avoidance hole located below the first mounting hole and communicating with the first mounting hole. The aperture of the first avoidance hole is larger than the outer diameter of the first fastener.

[0021] In the above technical solution, the length of the first fastener in the vertical direction is less than the size of the battery assembly in the vertical 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, enabling the disassembly and assembly of the first fastener without interference.

[0022] In some embodiments, the first seal and / or the second seal is an elastic sealing ring, and the elastic sealing ring is used for press-fitting with the battery assembly.

[0023] In the above technical solution, by using the pressure formed by the connection of the battery assembly, the elastic sealing ring is pressed, which is beneficial to improving the sealing effect. And when the battery assembly needs to be disassembled, removing the fixing structure of the battery assembly can cancel the pressing force on the elastic sealing ring, and the elastic sealing ring can be separated from the battery assembly, making the disassembly and assembly of the battery assembly convenient.

[0024] In some embodiments, the first seal and / or the second seal is an adhesive, and the adhesive is used for bonding with the battery assembly.

[0025] In the above technical solution, the adhesive has viscosity, can achieve a better sealing effect, and is not easily misaligned during the assembly process to affect the sealing effect. When the battery assembly needs to be disassembled, the adhesive can be removed by tearing, without affecting the disassembly of the battery assembly.

[0026] In some embodiments, the material of the adhesive includes butyl mastic.

[0027] In the above technical solution, butyl mastic is an adhesive with relatively weak viscosity. While achieving sealing, it can reduce the difficulty of tearing and removing.

[0028] In some embodiments, the battery assembly includes a box body and battery cells disposed within the box body. The box body includes: a frame body, the frame body including a sill beam, and the front cabin assembly and the rear floor assembly are respectively connected to the frame body; a bottom plate, the perimeter of the bottom plate being connected to the lower end of the frame body.

[0029] In the above technical solution, the sill beam is connected to the frame wall of the frame body to improve the overall structural strength of the box body; or the sill beam directly serves as the frame wall of the frame body to reduce the number of components of the battery assembly, reduce the space occupied by the box body to increase the energy density, and reduce the weight of the whole vehicle.

[0030] In some embodiments, the box body further includes a cover body, the perimeter of the cover body being connected to the upper end of the frame body.

[0031] In the above technical solution, it is convenient to seal the upper end of the frame body through the cover body before the battery assembly is mated with the upper vehicle body, which is convenient to improve the sealing effect and operation convenience.

[0032] In some embodiments, the cover body includes a front floor.

[0033] 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 components of the cover body, reducing the space occupied by the box body and its weight, and increasing the energy density.

[0034] In a third aspect, an embodiment of the present invention further provides a vehicle body structure, characterized in that it includes an upper vehicle body and a lower vehicle body of the above vehicle body structure, and the lower vehicle body is installed on the lower side of the upper vehicle body to cooperate to define a passenger compartment.

[0035] In the above technical solution, the battery assembly is integrated into the lower vehicle body, which is beneficial to reducing the number of components and the total weight of the lower vehicle body. And since the battery assembly can be independently disassembled relative to the front cabin assembly and the rear floor assembly, when the battery assembly needs to be repaired and replaced, only the battery assembly needs to be disassembled, and there is no need to disassemble the front cabin assembly and the rear floor assembly together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0036] In some embodiments, the upper surface of at least part of the side wall of the battery assembly includes a mating surface, and the mating surface abuts against the upper vehicle body.

[0037] In the above technical solution, by the mating surface abutting against the upper vehicle body, it is beneficial to improve the connection strength between the battery assembly and the upper vehicle body.

[0038] In some embodiments, the side wall is provided with a plurality of the mating surfaces, and the plurality of mating surfaces are arranged along the inner and outer directions of the side wall and are staggered in height along the up and down directions.

[0039] In the above technical solution, multiple mating surfaces make the upper surface form a stepped surface, which can not only use the stepped surface to achieve limit in the inner and outer directions and support limit in the up and down directions, but also is beneficial to improving the connection strength between the battery assembly and the vehicle body. Moreover, multi-point connection can be achieved in the inner and outer directions to improve the connection reliability.

[0040] 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 vehicle body and is suitable for disassembly and assembly in the up and down directions.

[0041] In the above technical solution, the second connection structure is formed as a Z-direction connection structure, so that the disassembly operation of the second connection structure can be performed from the lower side of the vehicle body during disassembly, without being interfered by other structures of the vehicle body and the lower vehicle body, which is convenient for realizing the separate disassembly of the battery assembly and making the operation more convenient.

[0042] In some embodiments, the second connection structure includes a second fastener and a second mounting hole provided in the battery assembly. The second mounting hole extends in the up and down directions, and the second fastener is upwardly inserted through the second mounting hole and connected to the vehicle body.

[0043] In the above technical solution, the disassembly and assembly processes of the second fastener can both be operated from the lower side of the vehicle body. During disassembly, the second fastener moves downward and there is no positional interference with the upper structures, which is convenient for realizing the separate disassembly and assembly of the battery assembly. Moreover, the second fastener can improve the connection strength between the battery assembly and the vehicle body.

[0044] In some embodiments, the second connection structure is fixedly provided on the battery assembly and is suitable for connecting to the vehicle body from bottom to top.

[0045] In the above technical solution, the second connection structure can move up and down synchronously with the battery assembly. While releasing the connection between the battery assembly and the vehicle body, the battery assembly can be moved out downward, which is beneficial to improving the disassembly and assembly efficiency.

[0046] In some embodiments, the vehicle body structure includes a third seal, and the third seal extends along the circumference of the passenger compartment and seals the gap between the lower vehicle body and the upper vehicle body. The front part of the third seal is in sealing cooperation with the front cabin assembly, the middle part of the third seal is in sealing cooperation with the middle part of the battery assembly, and the rear part of the third seal is in sealing cooperation with the rear floor assembly.

[0047] In the above technical solution, by providing the third seal, the sealing between the upper vehicle body and the lower vehicle body can be achieved, and it is not easy for water, dust, etc. to enter the passenger compartment. Moreover, in the up and down directions, the second connection structure connecting the battery assembly and the vehicle body can provide a pressing force to the third seal, which can not only improve the sealing effect, but also improve the stability and service life of the third seal.

[0048] In a third aspect, an embodiment of the present invention further provides a vehicle, including the above-mentioned body structure.

[0049] In a fourth aspect, an embodiment of the present invention further provides a disassembly and assembly method for a lower vehicle body, where the lower vehicle body is the lower vehicle body of the above-mentioned body structure. The disassembly and assembly method includes a disassembly process of separately disassembling the battery assembly. The disassembly process includes: releasing the connections of the battery assembly with the front cabin assembly, the rear floor assembly, and the upper vehicle 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 vehicle body respectively, so as to achieve the separate disassembly of the battery assembly.

[0050] In the above technical solution, integrating the battery assembly into the lower vehicle body is beneficial to reducing the number of parts and the total weight of the body structure. And when the battery assembly needs to be repaired and replaced, only the battery assembly needs to be disassembled, and it is not necessary to remove the front cabin assembly and the rear floor assembly together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0051] In some embodiments, the disassembly and assembly method includes a reassembly process of the battery assembly. The reassembly process includes: arranging a sealing member extending along the circumferential direction of the battery assembly on the battery assembly; installing the battery assembly upward from below on the front cabin assembly, the rear floor assembly, and the upper vehicle body, and sealing the front part of the battery assembly with the front cabin assembly, sealing the rear part of the battery assembly with the rear floor assembly, and sealing the middle part of the battery assembly with the upper vehicle body through the sealing member.

[0052] In the above embodiment, by arranging the sealing member, it is beneficial to improve the sealing performance at the mating part after the battery assembly is reassembled, thereby improving the sealing effects of the battery assembly, the engine compartment, the passenger compartment, and the body structure.

[0053] In a fifth aspect, an embodiment of the present invention further provides a disassembly and assembly method for a lower vehicle body, where the lower vehicle body is the lower vehicle body of the above-mentioned body structure. The disassembly and assembly method includes an assembly process of the lower vehicle body. The assembly process includes: arranging a first sealing member at the front part of the battery assembly and arranging a second sealing member at the rear part of the battery assembly; detachably installing the battery assembly between the front cabin assembly and the rear floor assembly, and making the first sealing member seal the gap between the front part of the battery assembly and the front cabin assembly, and making the second sealing member seal the gap between the rear part of the battery assembly and the rear floor assembly.

[0054] In the above embodiments, integrating the battery assembly into the lower vehicle body helps reduce the number of components and the total weight of the vehicle body structure. Moreover, when the battery assembly needs to be repaired or replaced, only the battery assembly needs to be disassembled, without removing the front cabin assembly and the rear floor assembly together, which greatly improves the disassembly and assembly convenience, helps improve the replacement and repair efficiency, and enhances the user experience.

[0055] In some embodiments, the disassembly and assembly method includes the assembly process of installing the lower vehicle body on the upper vehicle body, and the assembly process includes: arranging a third sealant around the passenger compartment on the upper side of the lower vehicle body; installing the lower vehicle body upward on the lower side of the upper vehicle body, and making the third sealant seal the gap between the lower vehicle body and the upper vehicle body.

[0056] In the above embodiments, the seal between the upper vehicle body and the lower vehicle body can be sealed through the third sealant, improving the sealing performance of the periphery of the bottom of the passenger compartment and enhancing the waterproof and dustproof effects.

[0057] In some embodiments, the disassembly and assembly method includes the disassembly process of separately disassembling the battery assembly, and the disassembly process includes: releasing the connections of the battery assembly with the front cabin assembly, the rear floor assembly, and the upper vehicle 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 vehicle body respectively, so as to achieve the separate disassembly of the battery assembly.

[0058] In the above embodiments, the separate disassembly of the battery assembly can be achieved without splitting the front cabin assembly, the rear floor assembly from the upper vehicle body, which greatly improves the disassembly and assembly convenience, helps improve the replacement and repair efficiency, and enhances the user experience. Description of the Drawings

[0059] Figure 1 A schematic diagram of a state of the vehicle body structure provided by an embodiment of the present invention, in which the upper vehicle body is separated from the lower vehicle body;

[0060] Figure 2 A schematic diagram of a state of the vehicle body structure provided by an embodiment of the present invention, in which the upper vehicle body is connected to the lower vehicle body;

[0061] Figure 3 A schematic diagram of a state of the vehicle body structure provided by an embodiment of the present invention, in which the battery assembly is separated from the upper vehicle body;

[0062] Figure 4 A schematic diagram of the structure of the lower vehicle body provided by an embodiment of the present invention;

[0063] Figure 5 An exploded view of the lower vehicle body and the sealant provided by an embodiment of the present invention;

[0064] Figure 6 Structural schematic diagram of the battery assembly provided by an embodiment of the present invention;

[0065] Figure 7 Partial mating structure schematic diagram of the battery assembly and the upper vehicle body provided by an embodiment of the present invention;

[0066] Figure 8 Flowchart of the disassembly and assembly method of the lower vehicle body provided by an embodiment of the present invention.

[0067] Reference numerals:

[0068] Vehicle body structure 100;

[0069] Upper vehicle body 10;

[0070] Lower vehicle body 20;

[0071] Front cabin assembly 21; front anti-collision beam 211; front longitudinal beam 212; front torsion box 213;

[0072] 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;

[0073] Rear floor assembly 23; rear anti-collision beam 231; rear longitudinal beam 232; rear torsion box 233; rear cross beam 234; rear floor 235;

[0074] First connection structure 31; first fastener 311; first mounting hole 312; second connection structure 32; second fastener 321; second mounting hole 322;

[0075] Seal 40; third seal 41; first seal part 411; second seal part 412; third seal part 413; first seal 42; second seal 43. Detailed implementation manners

[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0077] Unless otherwise defined, all technical and scientific terms used in this invention have the same meanings as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the invention in this invention are only for the purpose of describing specific embodiments, and are not intended to limit this invention. The terms "including" and "having" and any variations thereof in the description and claims of this invention and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this invention or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0078] Reference to "embodiment" in this invention means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this invention. The phrase appearing at various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0079] In the description of this invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0080] The term "and / or" in this invention is only a description of the association relationship of associated objects, indicating that there can be three relationships. 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 invention generally represents an "or" relationship between the associated objects before and after.

[0081] In the embodiments of this invention, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thicknesses, lengths, widths, etc. of various components in the embodiments of this invention shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative descriptions and should not constitute any limitation to this invention.

[0082] The "plurality" mentioned in this invention refers to two or more (including two).

[0083] The battery can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft, and can form a power supply system for the electrical device such as the battery to ensure the safety and reliability of the use of the electrical device. For example, the electrical device can be, but not limited to, a vehicle, a mobile phone, a tablet, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, or a gas vehicle, or a new energy vehicle, or a rail vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, an extended-range electric vehicle, and a fuel cell electric vehicle, etc.

[0084] In some related technologies, the vehicle has a complete chassis structure, including structures such as cross beams, frame longitudinal beams, and floors. The battery pack is then installed on the chassis of the vehicle, with many parts, a complex structure, a heavy weight, and it is relatively difficult to replace and repair.

[0085] In some other related technologies, the battery-body integration technology (i.e., CTC technology), which is the technology of integrating the battery pack and the chassis together, has become the main technical field for research and development to improve efficiency and reduce costs, and can reduce the number of components and the weight of the vehicle. However, the integrated design makes the disassembly and assembly operation of the battery pack complex. When replacing and repairing, it is necessary to disassemble the integrated structure of the battery pack and the chassis as a whole from the upper vehicle body, and then disassemble the battery pack from the chassis to repair and replace the battery pack, which is not conducive to after-sales maintenance.

[0086] Based on this, the present application proposes a lower vehicle body 20 of a body structure 100 that facilitates after-sales maintenance of the battery.

[0087] In the present invention, the body structure 100 refers to the layout form of each component that constitutes the whole body. The body structure 100 includes an upper vehicle body 10 and a lower vehicle body 20. The upper vehicle body 10 refers to the part of the vehicle used for carrying people and goods, and can include, for example, windows, doors, and a passenger compartment. The lower vehicle body 20 includes a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23.

[0088] The front cabin assembly 21 is used to play the role of transmitting the front collision load. For example, the front cabin assembly 21 can include a front anti-collision beam 211, two front longitudinal beams 212, and two front torsion boxes 213. The front ends of the two front longitudinal beams 212 are respectively connected to both ends of the front anti-collision beam 211, the rear ends of the two front longitudinal beams 212 are respectively connected to the two front torsion boxes 213, and the front torsion box 213 is connected to the battery assembly 22. When the vehicle is collided, the front anti-collision beam 211 can evenly bear the expansion load, and share the collision load through the two front longitudinal beams 212 and the corresponding two front torsion boxes 213 to reduce the damage to the passenger compartment.

[0089] The rear floor assembly 23 is an installation carrier for system components such as interior and exterior trims and electrical appliances. It plays an important role in carrying passengers, placing a spare tire, and reducing fuel tank damage and minimizing passenger injury through its own deformation during a rear collision. 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 cross beam 234, and a rear floor 235. The rear ends of the two rear longitudinal beams 232 are respectively connected to both ends of the rear anti-collision beam 231, the front ends of the two rear longitudinal beams 232 are respectively connected to the two rear torsion boxes 233, the rear torsion boxes 233 are connected to the battery assembly 22, the rear cross beam 234 connects the two rear torsion boxes 233, and the rear floor 235 is installed between the two rear longitudinal beams 232.

[0090] The battery assembly 22 refers to a physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery assembly 22 mentioned in the present invention may include a battery module or a battery pack, etc. Some battery assemblies 22 may include a box body 202 for accommodating one or more battery cells or battery modules. The box body 202 can reduce or avoid the influence of liquid or other foreign objects on the charging or discharging of the battery cells.

[0091] The structure of the box body 202 can be flexibly set. For example, in some embodiments, the box body 202 may include a first shell and a second shell, and the first shell and the second shell are snapped together to form a sealed box body 202. In other embodiments, the box body 202 includes a frame body 222, the frame body 222 has an upper end opening and a lower end opening, and the frame body 222 cooperates with other structures of the vehicle to achieve sealing. In still other embodiments, the box body 202 includes one of a cover body 225 and a bottom plate 226 and the frame body 222. The cover body 225 is connected to the upper end of the frame body 222, and the bottom plate 226 is connected to the lower end of the frame body 222, so that the box body 202 has an end opening, and this end opening can cooperate with other structures of the vehicle to achieve sealing. One of the cover body 225 and the bottom plate 226 can be integrally formed with the frame body 222, and the cover body 225, the bottom plate 226, and the frame body 222 can also be separate parts connected together. Of course, in other embodiments, the box body 202 may also include the frame body 222, the cover body 225, and the bottom plate 226 at the same time, which are all within the protection scope of the present invention.

[0092] The battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of the present invention are not limited thereto. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc., and the embodiments of the present invention are also not limited thereto. Generally, the battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present invention are also not limited thereto.

[0093] For example, a battery cell may include a housing, an electrode assembly, and an electrolyte. The housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0094] The vehicle body structure 100 proposed in this application includes an upper vehicle body 10 and a lower vehicle body 20. The lower vehicle body 20 is installed on the lower side of the upper vehicle body 10 to cooperate to define an occupant compartment. The lower vehicle 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 part of the battery assembly 22 is detachably engaged with the front cabin assembly 21, and the rear part of the battery assembly 22 is detachably engaged with the rear floor assembly 23. The battery assembly 22 can be detachably engaged with the upper vehicle body 10 of the vehicle body structure 100 relative to the front cabin assembly 21 and the rear floor assembly 23 alone.

[0095] In the description of this application, the orientations such as up, down, front, rear, 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 the direction from front to rear, the direction from the roof of the vehicle to the bottom of the vehicle is the direction from top to bottom, and the driver's seat and the passenger seat are arranged in the left-right direction.

[0096] In the lower vehicle body 20 of the vehicle body structure 100 with the above structure, the battery assembly 22 is integrated into the lower vehicle body 20, which is beneficial to reducing the number of components and the total weight of the lower vehicle body 20. And by the battery assembly 22 being detachable independently relative to the front cabin assembly 21 and the rear floor assembly 23, when the battery assembly 22 needs to be repaired and replaced, only the battery assembly 22 needs to be disassembled, and it is not necessary to disassemble the front cabin assembly 21 and the rear floor assembly 23 together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0097] The vehicle body structure 100 including the lower vehicle body 20 according to the embodiment of the present invention can be used for a vehicle. The vehicle can be a fuel vehicle, or a gas vehicle, or a new energy vehicle, or a rail vehicle. Among them, the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, an extended-range electric vehicle, a fuel cell powered vehicle, etc.

[0098] Next, with reference to the drawings, the lower vehicle body 20 of the vehicle body structure 100 according to the first aspect embodiment of the present invention and the vehicle body structure 100 according to the second aspect embodiment of the present invention will be described. The vehicle body structure 100 includes an upper vehicle body 10 and the lower vehicle body 20 according to the first aspect embodiment of the present invention. The lower vehicle body 20 is installed on the lower side of the upper vehicle body 10, and the upper vehicle body 10 and the lower vehicle body 20 cooperate to define an occupant compartment.

[0099] Please refer to Figures 1 - 5 , Figures 1 - 3Schematic diagrams of different states of the vehicle body structure 100 provided by the embodiments of the present invention, where Figure 1 the upper vehicle body 10 is separated from the lower vehicle body 20, Figure 2 the upper vehicle body 10 is connected to the lower vehicle body 20, Figure 3 the battery assembly 22 is separated from the upper vehicle body 10, Figure 4 Schematic diagram of the structure of the lower vehicle body 20 provided by the embodiments of the present invention, Figure 5 Exploded view of the lower vehicle body 20 and the sealing structure 40 provided by the embodiments of the present invention. The vehicle body structure 100 includes: an upper vehicle body 10 and a lower vehicle body 20. The lower vehicle body 20 of the vehicle body structure 100 includes a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23. The front part of the battery assembly 22 is detachably engaged with the front cabin assembly 21, and the rear part of the battery assembly 22 is detachably engaged with the rear floor assembly 23. The battery assembly 22 can be detachably engaged with the upper vehicle body 10 of the vehicle body structure 100 relative to the front cabin assembly 21 and the rear floor assembly 23.

[0100] The detachable engagement methods between the front part of the battery assembly 22 and the front cabin assembly 21 include, but are not limited to, clearance fit, abutment, snap fit, bonding, connection by fasteners 30 (such as bolts, etc.). Similarly, the detachable engagement methods between the rear part of the battery assembly 22 and the rear floor assembly 23 include, but are not limited to, clearance fit, abutment, snap fit, bonding, connection by fasteners 30.

[0101] The connection methods between the lower vehicle body 20 and the upper vehicle body 10 include, but are not limited to, welding, snap fit, bonding, connection by fasteners 30. It should be noted that among the front cabin assembly 21, the battery assembly 22, and the rear floor assembly 23 in the lower vehicle body 20, one or two of them can be directly connected to the upper vehicle body 10, or all three can be directly connected to the upper vehicle body 10. Among them, in the embodiment where the battery assembly 22 is directly connected to the upper vehicle body 10, the battery assembly 22 and the upper vehicle body 10 are detachably connected.

[0102] The battery assembly 22 is detachably coupled to the upper body 10 relative to the front compartment assembly 21 and the rear floor assembly 23. In other words, when the battery assembly 22 needs to be disassembled, the battery assembly 22 can be removed while keeping the front compartment assembly 21 and the rear floor assembly 23 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 against the upper body 10, the connection between the battery assembly 22 and the front compartment assembly 21 and the connection between the battery assembly 22 and the rear floor assembly 23 can be released while keeping the front compartment assembly 21 and the rear compartment assembly connected to the upper body 10 respectively, so as to facilitate the separation of the battery assembly 22 from the upper body 10. Another example is that in an embodiment where the battery assembly 22 is connected to the upper body 10 by 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 respectively, so as to facilitate the separation of the battery assembly 22 from the upper body 10.

[0103] Of course, in an embodiment where the front compartment assembly 21 is detachable, when disassembling the front compartment assembly 21, the front compartment assembly 21 can be detachably removed alone, or both the front compartment assembly 21 and the battery assembly 22 can be removed, or both the front compartment assembly 21, the battery assembly 22 and the rear floor assembly 23 can be removed; in an embodiment where the rear floor assembly 23 is detachable, when disassembling the rear floor assembly 23, the rear floor assembly 23 can be detachably removed alone, or both the rear floor assembly 23 and the battery assembly 22 can be removed, or both the rear floor assembly 23, the battery assembly 22 and the front compartment assembly 21 can be removed, which are all within the protection scope of the present invention.

[0104] For the lower body 20 of the vehicle body structure 100 according to the embodiment of the present invention, the battery assembly 22 is integrated into the lower body 20, which is beneficial to reducing the number of components and the total weight of the lower body 20. And by the battery assembly 22 being independently detachable 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 disassembled, and it is not necessary to remove the front compartment assembly 21 and the rear floor assembly 23 together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0105] In some embodiments, the front portion of the battery assembly 22 abuts against the front compartment assembly 21; in some embodiments, the rear portion of the battery assembly 22 abuts against the rear floor assembly 23; in some embodiments, as Figure 4 shown, the front portion of the battery assembly 22 abuts against the front compartment assembly 21, and the rear portion of the battery assembly 22 abuts against the rear floor assembly 23.

[0106] Contact means that two components are in contact with each other and pressed against each other to improve the connection strength between the two components. Taking the battery assembly 22 and the front cabin assembly 21 as an example, the upper surface of the front part of the battery assembly 22 can be in contact with the lower surface of the connection part of the front cabin assembly 21 to achieve reliable limit and fixation of the battery assembly 22 and the front cabin assembly 21 in the up and down direction; or the side surface of the front part of the battery assembly 22 facing away from the center of the battery assembly 22 can be in contact with the side surface of the front cabin assembly 21 to achieve reliable limit and fixation of the battery assembly 22 and the front cabin assembly 21 in the horizontal direction (such as at least one of the left and right directions and the front and back directions).

[0107] According to some embodiments of the present invention, as Figure 7 shown, the upper surface of at least part of the side wall of the battery assembly 22 includes a mating surface 223, and the mating surface 223 is in contact with the upper vehicle body 10. By contacting the mating surface 223 with the upper vehicle body 10, it is beneficial to improve the connection strength between the battery assembly 22 and the upper vehicle body 10.

[0108] Among them, the mating surface 223 can be an annular surface continuously extending along the circumference of the battery assembly 22, or a part of the upper surface of the side wall, which can all improve the overall strength to varying degrees.

[0109] In some embodiments, the battery assembly 22 includes a frame 222, and the upper surface of at least part of the frame wall of the frame 222 includes a mating surface 223. The frame 222, that is, a closed annular structure extending around the center line of the battery assembly 22, and the annular structure includes but is not limited to a square annular shape and a circular annular shape, etc. For example Figure 6 shown, the frame 222 is a closed square annular structure, including a front frame wall, a left frame wall, a rear frame wall, and a right frame wall that are sequentially connected end to end.

[0110] In some embodiments, as Figure 6 and Figure 7 shown, the side wall is provided with a plurality of mating surfaces 223, and the plurality of mating surfaces 223 are arranged in the inner and outer directions of the side wall (that is, the direction of approaching and departing from the center) and are arranged at different heights in the up and down direction, and the plurality of mating surfaces 223 are respectively in contact with the upper vehicle body 10.

[0111] For example, the upper surface of at least part of the frame wall of the frame 222 includes a plurality of mating surfaces 223, that is, the upper surfaces of all the frame walls of the frame 222 include a plurality of mating surfaces 223, or the upper surfaces of a part of the frame walls include a plurality of mating surfaces 223, or the upper surface of an entire side frame wall includes a plurality of mating surfaces 223, or a part of the upper surface of a side frame wall includes a plurality of mating surfaces 223.

[0112] As Figure 7As shown, a plurality of mating surfaces 223 are arranged with a height offset in the up and down direction, so that the upper surface is formed into a stepped surface. For example, the mating surfaces 223 extend in the horizontal direction, and two adjacent mating surfaces 223 are connected by a connecting surface extending in the up and down direction. The heights of the plurality of mating surfaces 223 can increase from the inside to the outside (i.e., in the direction away from the center of the housing 222), or decrease as shown in Figure 7 shown, or increase and decrease alternately.

[0113] The plurality of mating surfaces 223 are respectively abutted against the upper vehicle body 10, so that the upper vehicle body 10 forms a stepped surface with a matching shape. Not only can the stepped surface be used to achieve limit in the inside-outside direction (i.e., the direction close to and away from the battery cell) and support limit in the up and down direction, which is beneficial to improving the connection strength between the battery assembly 22 and the upper vehicle body 10. Moreover, multi-point connection can be achieved in the inside-outside direction to improve connection reliability.

[0114] According to some embodiments of the present invention, the front cabin assembly 21 may include a first connecting portion, the first connecting portion is located on one side of the front part of the battery assembly 22 in the left-right direction, and the first connecting member is detachably passed through the first connecting portion and the battery assembly 22 in the left-right direction. The rear floor assembly 23 includes a second connecting portion, the second connecting portion is located on one side of the rear part of the battery assembly 22 in the left-right direction, and the second connecting member is detachably passed through the second connecting portion and the battery assembly 22 in the left-right direction.

[0115] The first connecting portion may be a part of the front longitudinal beam 212 of the front cabin assembly 21, or may be at least a part of the front torsion box 213. The second connecting portion may be a part of the rear longitudinal beam 232 of the rear floor assembly 23, or may be at least a part of the rear torsion box 233.

[0116] The specific structures of the first connecting member and the second connecting member are not limited, including but not limited to fasteners 30 such as bolts, buckles, lock pins driven by motors, etc.

[0117] Taking the first connecting member as an example, the first connecting member can be disassembled and assembled 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 realize the separation of the battery assembly 22 from the first connecting portion, so as to facilitate the separation of the battery assembly 22 from the front cabin assembly 21. The disassembly and assembly of the first connecting member can be carried out from the side of the vehicle body structure 100 without interfering with the connection between the front cabin assembly 21 and the upper vehicle body 10, and there is no need to disassemble the front cabin assembly 21.

[0118] For example, in some embodiments, the front cabin assembly 21 further includes a first upper body connection portion for connecting to the upper body 10, and the first upper body connection portion and the first connection portion may be spaced apart; the rear floor assembly 23 further includes a second upper body connection portion for connecting to the upper body 10, and the second upper body connection portion and the second connection portion may be spaced apart. The first upper body connection portion and the second upper body connection portion may be connected to the upper body 10 by any connection method such as welding or connection with fasteners 30. The first connection portion and the first upper body connection portion, and the second connection portion and the second upper body connection portion may be spaced apart in the front-to-back direction, in the left-right direction, or in the up-down direction. For example, the first upper body connection portion and the second upper body connection portion may be arranged in an area blocked by the upper body 10, and the first connection portion and the second connection portion may be arranged in an area not blocked by the upper body 10, for example, the first connection portion and the second connection portion are both staggered with the upper body 10, or the upper body 10 is provided with a avoidance opening extending in the left-right direction opposite to the first connection portion and the second connection portion.

[0119] In some embodiments connected by a first connector and a second connector, a first seal 42 is provided between a side surface of a front portion of the battery assembly 22 and a first connection portion of the front compartment assembly 21, and a second seal 43 is provided between a side surface of a rear portion of the battery assembly 22 and a second connection portion of the rear floor assembly 23.

[0120] The first seal 42 can seal the gap between the front cabin 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.

[0121] Furthermore, the side surface of the battery assembly 22 refers to the surface of one side of the battery assembly 22 along 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, and the first connecting member can provide a pressing force to the first sealing member 42 when connecting the battery assembly 22 and the first connecting portion along the left-right direction, which can not only improve the sealing effect, but also improve 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.

[0122] According to some embodiments of the present invention, please refer to Figure 1 and Figure 4As shown, the front part of the battery assembly 22 is located below the front cabin assembly 21, and the rear part of the battery assembly 22 is located below the rear floor assembly 23. In other words, the front part of the battery assembly 22 is not offset from the front cabin assembly 21 in the front-rear direction and is located on the side of the front cabin assembly 21 away from the upper vehicle body 10, and the rear part of the battery assembly 22 is not offset from the rear floor assembly 23 in the front-rear direction and is located on the side of the rear floor assembly 23 away from the upper vehicle body 10.

[0123] Thus, after the connection structure of the battery assembly 22 is disconnected, the battery assembly 22 can directly move downward to separate from the upper vehicle body 10, the front cabin assembly 21, and the rear floor assembly 23, and at the same time, the front cabin assembly 21 and the rear floor assembly 23 will not interfere with the disassembly and movement of the battery assembly 22.

[0124] Of course, in some other embodiments, the front part of the battery assembly 22 can be completely offset from the front cabin assembly 21 in the front-rear direction, and the rear part of the battery assembly 22 can be completely offset from the rear floor assembly 23 in the front-rear direction, that is, the front cabin assembly 21, the battery assembly 22, and the rear floor assembly 23 are strictly offset and arranged in sequence from front to back.

[0125] In addition, in the 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 - 5 As shown, the battery assembly 22 can be provided with a first connection structure 31, and the first connection structure 31 is used to connect with at least one of the front cabin assembly 21 and the rear floor assembly 23, and the first connection structure 31 can be disassembled and assembled in the up-down direction.

[0126] Since the first connection structure 31 can be disassembled and assembled in the up-down direction, the first connection structure 31 is formed as a Z-direction connection structure, so that the first connection structure 31 can be disassembled from the lower side of the lower vehicle body 20 during disassembly, without being interfered by other structures of the upper vehicle body 10 and the lower vehicle body 20, which is convenient for realizing the separate disassembly of the battery assembly 22 and makes the operation more convenient.

[0127] It should be noted that when the first connection structure 31 is disassembled and assembled in the up-down direction, the up-down direction here can be parallel to the vertical direction or form a certain angle with the vertical direction, as long as it can be disassembled from the lower side of the first connection structure 31.

[0128] In some embodiments, please refer to Figure 5 , a first sealing member 42 is provided between the upper surface of the front part of the battery assembly 22 and the front cabin assembly 21, and the first sealing member 42 seals the gap between the battery assembly 22 and the front cabin assembly 21; a second sealing member 43 is provided between the upper surface of the rear part of the battery assembly 22 and the rear floor assembly 23, and the second sealing member 43 seals the gap between the rear floor assembly 23 and the battery assembly 22.

[0129] By setting the first seal 42 and the second seal 43, the sealing performance between the components of the lower vehicle body 20 can be improved, which is conducive to enhancing the sealing performance of the engine compartment and the trunk compartment.

[0130] Moreover, in the vertical direction, the first seal 42 is located between the battery assembly 22 and the front compartment assembly 21. When the first connection structure 31 connects the battery assembly 22 and the front compartment assembly 21 in the vertical direction, it can provide a pressing force to the first seal 42, which can not only improve the sealing effect but also enhance 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 connection structure 31 can also be used to improve the sealing effect and stability.

[0131] In the embodiments of the present application, the specific structure of the first connection structure 31 can be flexibly set as long as it can be disassembled and assembled in the vertical direction.

[0132] For example, in some specific embodiments, the first connection structure 31 is fixedly provided on the battery assembly 22, and the first connection structure 31 can be connected to the front compartment assembly 21 or the rear floor assembly 23 from bottom to top. Thus, the first connection structure 31 can move up and down synchronously with the battery assembly 22. When disconnecting the connection between the battery assembly 22 and the front compartment assembly 21 or the rear floor assembly 23, the battery assembly 22 can be moved out downward, which is beneficial to improving the disassembly and assembly efficiency.

[0133] For example, the first connection structure 31 can be a buckle fixedly provided on the battery assembly 22. Moving the battery assembly 22 upward can simultaneously snap the buckle into the front compartment assembly 21 or the rear floor assembly 23, and moving the battery assembly 22 downward can simultaneously release the snap connection between the buckle and the front compartment assembly 21 or the rear floor assembly 23. The first connection 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, and the rotation of the bolt can achieve threaded connection and disconnection with the front compartment assembly 21 or the rear floor assembly 23.

[0134] For example, in some specific embodiments, please refer to Figures 5 - 7 as shown in Figure 6 which is a schematic structural diagram of the battery assembly 22 provided by an embodiment of the present invention, Figure 7 and which is a schematic diagram of the partial mating structure between the battery assembly 22 and the upper vehicle body 10 provided by an embodiment of the present invention. The first connection structure 31 includes a first fastener 311 and a first mounting hole 312 provided on the battery assembly 22. The first mounting hole 312 extends in the vertical direction, and the first fastener 311 passes upward through the first mounting hole 312 and is 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.

[0135] The disassembly and assembly processes of the first fastener 311 can be operated from the lower side of the lower vehicle body 20. When disassembling, the first fastener 311 is moved downward and there is no positional interference with the upper vehicle body 10, the front compartment assembly 21, the rear floor assembly 23, etc. above, which facilitates the separate disassembly and assembly of the battery assembly 22, and the first fastener 311 can improve the connection strength between the battery assembly 22 and the front compartment assembly 21 or the rear floor assembly 23.

[0136] The extension length of the first mounting hole 312 in the up-and-down direction can be flexibly set. For example, in an area where the size of the battery assembly 22 in the up-and-down direction is small, the first mounting hole 312 can penetrate through the upper surface and the lower surface of the battery assembly 22, and the effect of improving the connection strength is better.

[0137] In some specific embodiments, the battery assembly 22 is provided with a first avoidance hole located below the first mounting hole 312 and communicating with the first mounting hole 312, and the aperture 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, and there is no fastening fit between the first fastener 311 and the hole wall of the avoidance hole 227. Thus, the length of the first fastener 311 in the up-and-down direction is less than the size of the battery assembly 22 in the up-and-down direction, which is beneficial to reducing the size of the first fastener 311 while ensuring the connection strength requirements, and the first avoidance hole avoids the first fastener 311, so that the disassembly and assembly of the first fastener 311 are not interfered.

[0138] In some specific embodiments, as Figure 7 shown, the box body 202 of the battery assembly 22 includes side beams and reinforcing beams provided on the outer side surfaces of the side beams. The size of the side beams in the up-and-down direction is larger than the size of the reinforcing beams in the up-and-down direction. Among them, the first mounting holes 312 on the reinforcing beams penetrate through the upper and lower surfaces of the reinforcing beams, and opposite first avoidance holes are provided below the first mounting holes 312 on the side beams. The first mounting holes 312 can be respectively arranged at different sizes of the battery assembly 22. Among them, the first mounting holes 312 not opposite to the first avoidance holes can be arranged in an area where the size of the battery assembly 22 in the up-and-down direction is small, and the screw head of the first fastener 311 abuts against the lower surface of the battery assembly 22; the first mounting holes 312 opposite to the first avoidance holes can be arranged in an area where the size of the battery assembly 22 in the up-and-down direction is large, and the screw head of the first fastener 311 is located in the first avoidance hole and abuts against the edge of the first mounting hole 312. Thus, 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 be beneficial to improving the versatility of the first fastener 311 and reducing the cost.

[0139] According to some embodiments of the present invention, as Figures 5 - 7As shown, a second connection structure 32 is provided in the middle of the battery assembly 22. The second connection structure 32 is connected to the upper vehicle body 10, and the second connection structure 32 can be disassembled and assembled in the up and down direction.

[0140] The second connection structure 32 is formed as a Z-direction connection structure, so that the second connection structure 32 can be disassembled from the lower side of the lower vehicle body 20 during disassembly, without being interfered by other structures of the upper vehicle body 10 and the lower vehicle body 20, which is convenient for realizing the separate disassembly of the battery assembly 22 and making the operation more convenient. Moreover, the first connection structure 31 and the second connection structure 32 cooperate to be able to connect and fix the battery assembly 22 at the front, middle and rear of the battery assembly 22, improving the connection reliability of the battery assembly 22.

[0141] In some embodiments, the second connection structure 32 is fixedly provided on the battery assembly 22 and is adapted to be connected to the upper vehicle body from bottom to top. Thus, the second connection structure 32 can move up and down synchronously with the battery assembly 22. While releasing the connection between the battery assembly 22 and the upper vehicle body 10, it can realize the downward movement of the battery assembly 22, which is beneficial to improving the disassembly and assembly efficiency. For example, the second connection structure 32 can be a buckle, or include a motor and a bolt connected to the output end of the motor, etc.

[0142] In some embodiments, as Figures 5 - 7 shown, the second connection structure 32 includes a second fastener 321 and a second mounting hole 322 provided on the battery assembly 22. The second mounting hole 322 extends in the up and down direction. The second fastener 321 passes upward through the second mounting hole 322 and is connected to the upper vehicle body 10. The second fastener 321 includes but is not limited to bolts, studs, etc.

[0143] The disassembly and assembly process of the second fastener 321 can be operated from the lower side of the lower vehicle body 20. During disassembly, the second fastener 321 moves downward and there is no position interference with structures such as the upper vehicle body 10, the front cabin assembly 21, and the rear floor assembly 23 above, which is convenient for realizing the separate disassembly and assembly of the battery assembly 22, and the second fastener 321 can improve the connection strength between the battery assembly 22 and the upper vehicle body 10.

[0144] In some embodiments including the second mounting hole 322, as Figure 7As shown, the second mounting hole 322 can penetrate through the upper and lower surfaces of the battery assembly 22, or opposite second avoidance holes 227 can be provided below the second mounting hole 322. The second mounting hole 322 not opposite to the second avoidance hole 227 can be provided in an area with a relatively small dimension of the battery assembly 22 in the up and down direction, and the screw head of the second fastener 321 abuts against the lower surface of the battery assembly 22; the second mounting hole 322 opposite to the second avoidance hole 227 can be provided in an area with a relatively large dimension of the battery assembly 22 in the up and down direction. Thus, the dimensions of the second fasteners 321 in the second mounting holes 322 at different dimensions of the battery assembly 22 are relatively close or equal, which can not only ensure the connection stability, but also facilitate improving the versatility of the second fasteners 321 and reducing the cost.

[0145] In some embodiments, such as Figure 5 and Figure 7 As shown, the vehicle body structure 100 includes a third seal 41. The third seal 41 extends along the circumference of the passenger compartment and seals the gap between the lower vehicle body 20 and the upper vehicle body 10. The front part of the third seal 41 is in sealing cooperation with the front compartment assembly 21, the middle part of the third seal 41 is in sealing cooperation with the middle part of the battery assembly 22, and the rear part of the third seal 41 is in sealing cooperation with the rear floor assembly 23.

[0146] For example Figure 5 As shown, the third seal 41 includes a first seal part 411, a second seal part 412 and a third seal part 413, forming a complete seal extending along the circumference of the passenger compartment, with good sealing performance. The first seal part 411 seals the gap between the upper surface of the front compartment assembly 21 and the upper vehicle body 10; the second seal part 412 seals the gap between the upper surface of the rear floor assembly 23 and the upper vehicle body 10; the third seal part 413 seals the gap between the middle part of the battery assembly 22 and the upper vehicle body 10, and specifically can be in sealing contact with the upper surfaces of the left and right side beams of the frame body 222.

[0147] By providing the third seal 41, the sealing between the upper vehicle body 10 and the lower vehicle body 20 can be achieved, and it is not easy for water, dust, etc. to enter the passenger compartment. And in the up and down direction, the third seal 41 is located between the upper vehicle body 10 and the lower vehicle body 20, and the second connection structure 32 connecting the battery assembly 22 and the upper vehicle body 10 can provide a pressing force to the third seal 41, which can not only improve the sealing effect, but also improve the stability and service life of the third seal 41.

[0148] In some embodiments including the first seal 42, the second seal 43 and the third seal 41, please refer to Figure 5 , the third seal part 413 of the third seal 41 can be located between the first seal 42 and the second seal 43 and be in sealing connection with the first seal 42 and the second seal 43, which is beneficial to further improving the sealing effect.

[0149] For the first seal 42, the second seal 43, and the third seal 41, please refer to Figure 5 , and the specific structures of the first seal 42, the second seal 43, and the third seal 41 can be flexibly set.

[0150] For example, in some embodiments, at least one of the first seal 42, the second seal 43, and the third seal 41 can be an elastic sealing ring, and the elastic sealing ring is used for press-fitting with the battery assembly 22. The elastic sealing ring is a sealing ring that can undergo elastic deformation, and can be made of materials such as rubber and silica gel, for example. Utilizing the pressure formed by the cooperation between the battery assembly 22 and the front cabin assembly 21, between the battery assembly 22 and the rear floor assembly 23, and between the lower vehicle body 20 and the upper vehicle body 10, the elastic sealing ring is pressed tightly, which is beneficial to improving the sealing effect. And when it is necessary to disassemble the battery assembly 22, by releasing the fixing structure of the battery assembly 22, the pressing force on the elastic sealing ring can be withdrawn, and the elastic sealing ring can be separated from the battery assembly 22, the front cabin assembly 21, the rear floor assembly 23, or the upper vehicle body 10, making the disassembly and assembly of the battery assembly 22 convenient.

[0151] Again, for example, in some embodiments, as Figure 5 shown, at least one of the first seal 42, the second seal 43, and the third seal 41 can be an adhesive, and the adhesive is used for adhesive cooperation with the battery assembly 22. The adhesive has viscosity and can achieve a better sealing effect, and it is not easy to be misaligned during the assembly process and affect the sealing effect. When it is necessary to disassemble the battery assembly 22, the adhesive can be removed by tearing, which does not affect the disassembly of the battery assembly 22.

[0152] Moreover, in the embodiment where the third seal 41 is connected to the first seal 42 or the second seal 43, the connection can be achieved by using the viscosity of the adhesive, which is beneficial to improving the sealing performance at the connection.

[0153] In some specific embodiments, the adhesive can be a weak adhesive, that is, an adhesive with relatively weak viscosity. While achieving sealing, the difficulty of removing it by tearing can be reduced. For example, the weak adhesive can be butyl mastic.

[0154] The types of the first seal 42, the second seal 43, and the third seal 41 can be the same or different. For example, they can all be elastic sealing rings or all be adhesives, or one can be an elastic sealing ring and the other two can be adhesives, etc.

[0155] In some specific embodiments, at least one of the first seal 42 and the second seal 43 can be an adhesive, and the type of the adhesive is the same as that of the adhesive of the third seal 41. For example, they are both butyl mastic. Adhesives of the same type have better compatibility with each other, can improve the sealing performance at the connection, and are convenient for improving the sealing effect after the disassembly and assembly of the battery assembly 22.

[0156] The battery assembly 22 according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0157] According to some embodiments of the present invention, refer to Figure 6 , the battery assembly 22 includes a box body 202 and battery cells disposed within the box body 202. The box body 202 includes a frame body 222 and a bottom plate 226. The periphery of the bottom plate 226 is connected to the lower end of the frame body 222, thereby defining a space for accommodating the battery cells and providing shielding and protection for the battery cells. The components for mounting the battery assembly 22 can be connected to the frame body 222. For example, the upper vehicle body 10, the front cabin assembly 21, and the rear floor assembly 23 can be connected to the frame body 222 to mount the battery assembly 22 from the edge, which is beneficial to improving the mounting stability of the battery assembly 22.

[0158] Among them, the frame body 222 and the bottom plate 226 can be separate parts connected together, or can be integrally formed parts. The connection methods include but are not limited to fastener connection, welding, bonding, etc.

[0159] In addition, the frame body 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 during a side collision of the vehicle, protect the integrity of the occupant compartment, and reduce the injury of the vehicle occupants.

[0160] The frame body 222 includes a sill beam 224. In other words, the sill beam 224 is connected to the frame wall of the frame body 222 to improve the overall structural strength of the box body 202; or the sill beam 224 directly serves as the frame wall of the frame body 222 to reduce the number of components of the battery assembly 22, reduce the space occupied by the box body 202 to improve the energy density, and reduce the vehicle weight.

[0161] It should be noted that the upper end of the frame body 222 may have an upper opening. The upper opening can be sealed by the upper vehicle body 10, or the upper opening can also be covered by other structures of the battery assembly 22, which can make the battery cells in a relatively enclosed space.

[0162] For example, the top end of the frame body 22 is open, forming a battery without an upper cover. The battery cells of the battery without an upper cover can be arranged upright, that is, the electrical connection parts of the battery cells are located on the upper side, so that the battery without an upper cover can adapt to different occasions.

[0163] In some embodiments, as Figure 6 and Figure 7 shown, the box body 202 further includes a cover body 225. The periphery of the cover body 225 is connected to the upper end of the frame body 222. It is convenient to seal the upper end of the frame body 222 through the cover body 225 before the battery assembly 22 is matched with the upper vehicle body 10, which is beneficial to improving the sealing effect and operation convenience.

[0164] In some specific embodiments, such as Figure 6 and Figure 7 shown, the upper cover 225 includes a front floor. In other words, the front floor is integrated into the battery assembly 22 and is disassembled and assembled together with the battery assembly 22. This helps to reduce the number of components of the cover 225. For example, the front floor is directly connected to the frame 222 without other cover plate structures, so as to reduce the occupied space and weight of the box body 202 and improve the energy density.

[0165] In some embodiments, such as Figure 6 and Figure 7 shown, 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 disassembled and assembled together with the battery assembly 22. On the one hand, it improves the anti-puncture ability of the bottom of the battery assembly 22; on the other hand, it helps to reduce the number of components of the bottom plate 226. For example, the bottom guard plate directly covers the lower opening of the frame 222 without other cover plate structures, so as to reduce the occupied space and weight of the box body 202 and improve the energy density.

[0166] The vehicle according to the embodiment of the third aspect of the present invention includes the body structure 100 according to the above embodiments of the present invention. Thus, by adopting the above body structure 100, the battery assembly 22 is integrated into the lower vehicle body 20, which helps to reduce the number of components and the total weight of the lower vehicle body 20. And since the battery assembly 22 can be independently disassembled relative to the front cabin assembly 21 and the rear floor assembly 23, when the battery assembly 22 needs to be repaired and replaced, only the battery assembly 22 needs to be disassembled, and there is no need to disassemble the front cabin assembly 21 and the rear floor assembly 23 together, which greatly improves the disassembly and assembly convenience, helps to improve the replacement and repair efficiency, and improves the user experience.

[0167] Fourthly, the present invention also proposes a disassembly and assembly method for the lower vehicle body 20. The lower vehicle body 20 is the lower vehicle body 20 of the above body structure 100. The relevant operations and structures of the above body structure 100 and the lower vehicle body 20 can be introduced into the disassembly and assembly method of this embodiment, which will not be elaborated here.

[0168] As Figure 8 shown, the disassembly and assembly method includes the disassembly and assembly process of separately disassembling the battery assembly 22. The disassembly and assembly process may include:

[0169] Release the connections of the battery assembly 22 with the front cabin assembly 21, the rear floor assembly 23, and the upper vehicle body 10 respectively;

[0170] Lower the battery assembly 22 and release the seals between the battery assembly 22 and the front cabin assembly 21, the rear floor assembly 23, and the upper vehicle body 10 respectively, so as to achieve the separate disassembly of the battery assembly 22.

[0171] For example, the first fasteners 311 for connecting the front cabin assembly 21 and the battery assembly 22, the first fasteners 311 for connecting the rear floor assembly 23 and the battery assembly 22, and the second fasteners 321 for connecting the upper body 10 and the battery assembly 22 can be disassembled downward, thereby releasing the connections 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 by other components, and there is no need to disassemble the connections between the front cabin assembly 21 and the upper body 10, and between the rear floor assembly 23 and the upper body 10.

[0172] When the battery assembly 22 is moved downward, the first seal 42 between the front cabin 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 portion 413 between the upper body 10 and the battery assembly 22 are torn to release the seal. The first seal portion 411 between the front cabin assembly 21 and the upper body 10 and the second seal portion 412 between the rear floor assembly 23 and the upper body 10 can remain sealed.

[0173] According to the disassembly and assembly method of the lower body 20 in the embodiment of the present invention, integrating the battery assembly 22 into the lower body 20 is beneficial to reducing the number of components and the total weight of the vehicle body structure 100. And when the battery assembly 22 needs to be repaired or replaced, only the battery assembly 22 needs to be disassembled, and there is no need to remove the front cabin assembly 21 and the rear floor assembly 23 together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0174] In some embodiments, as Figure 5 and Figure 7 shown, the disassembly and assembly method further includes the reassembly process of the battery assembly 22, and the reassembly process includes:

[0175] Providing a seal 40 on the battery assembly 22 that extends circumferentially along the battery assembly 22;

[0176] Installing the battery assembly 22 upward from below on the front cabin assembly 21, the rear floor assembly 23, and the upper body 10, and sealing with the front cabin assembly 21 through the front part of the seal 40, sealing with the rear floor assembly 23 through the rear part of the seal 40, and sealing with the upper body 10 through the middle part of the seal 40.

[0177] For example, an adhesive can be applied circumferentially to the battery assembly 22 to form a seal 40. The seal 40 can include a first seal 42, a second seal 43, and a third seal portion 413 that form a ring. After the battery assembly 22 is reinstalled onto the integrated structure of the front cabin assembly 21, the rear floor assembly 23, and the vehicle body 10, the front portion of the seal 40 forms the first seal 42 and seals the gap between the front cabin assembly 21 and the battery assembly 22. The middle portion of the seal 40 forms the third seal portion 413 and seals the gap between the battery assembly 22 and the vehicle body 10. The rear portion of the seal 40 forms the second seal 43 and seals the gap between the rear floor assembly 23 and the battery assembly 22. Moreover, the middle portion of the seal 40 can be reconnected to the undismantled first seal portion 411 and second seal portion 412 to form a complete seal around the passenger compartment, improving the sealing performance.

[0178] By providing the seal 40, it is beneficial to improve the sealing performance at the mating parts after the battery assembly 22 is reinstalled, thereby enhancing the sealing effects of the battery assembly 22, the engine compartment, the passenger compartment, and the body structure 100.

[0179] In a fifth aspect, the present invention also proposes a disassembly and assembly method for the lower vehicle body 20. The lower vehicle body 20 is the lower vehicle body 20 of the above-mentioned body structure 100. The relevant operations and structures of the above-mentioned body structure 100 and the lower vehicle body 20 can all be introduced into the disassembly and assembly method of this embodiment, which will not be elaborated here.

[0180] The disassembly and assembly method includes the assembly process of the lower vehicle body 20. The assembly process includes:

[0181] A first seal 42 is provided at the front portion of the battery assembly 22, and a second seal 43 is provided at the rear portion of the battery assembly 22;

[0182] The battery assembly 22 is detachably installed between the front cabin assembly 21 and the rear floor assembly 23, and the first seal 42 seals the gap between the front portion of the battery assembly 22 and the front cabin assembly 21, and the second seal 43 seals the gap between the rear portion of the battery assembly 22 and the rear floor assembly 23.

[0183] By providing the first seal 42 between the front cabin assembly 21 and the battery assembly 22 and the second seal 43 between the rear floor assembly 23 and the battery assembly 22, it is beneficial to improve the sealing performance at the mating parts of the battery assembly 22, thereby enhancing the sealing effects of the battery assembly 22, the engine compartment, and the lower vehicle body 20.

[0184] For example, the battery assembly 22 can be connected to the front cabin assembly 21 and the rear floor assembly 23 through the first connection structure 31, facilitating the subsequent separate disassembly of the battery assembly 22.

[0185] According to the disassembly and assembly method of the lower vehicle body 20 of the above embodiment, integrating the battery assembly 22 into the lower vehicle body 20 is beneficial to reducing the number of components and the total weight of the vehicle body structure 100. And when the battery assembly 22 needs to be repaired and replaced, only the battery assembly 22 needs to be disassembled, without removing the front cabin assembly 21 and the rear floor assembly 23 together, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0186] In some embodiments, the disassembly and assembly method includes the assembly process of installing the lower vehicle body 20 on the upper vehicle body 10, and the assembly process includes:

[0187] Providing a third seal 41 on the upper side of the lower vehicle body 20 that extends around the passenger compartment;

[0188] Installing the lower vehicle body 20 upward on the lower side of the upper vehicle body 10, and making the third seal 41 seal the gap between the upper vehicle body 10 and the lower vehicle body 20.

[0189] In the above embodiment, the seal between the upper vehicle body 10 and the lower vehicle body 20 can be sealed through the third seal 41, improving the sealing performance of the periphery of the bottom of the passenger compartment and the waterproof and dustproof effect.

[0190] In addition, in the embodiment where the 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 vehicle body 20, improving the overall vehicle sealing effect.

[0191] Furthermore, the disassembly and assembly method of the lower vehicle body 20 can include the disassembly process of separately disassembling the battery assembly 22, and the disassembly process includes:

[0192] Releasing the connections of the battery assembly 22 with the front cabin assembly 21, the rear floor assembly 23, and the upper vehicle body 10 respectively;

[0193] Moving the battery assembly 22 downward, and releasing the seals between the battery assembly 22 and the front cabin assembly 21, the rear floor assembly 23, and the upper vehicle body 10 respectively, so as to realize the separate disassembly of the battery assembly 22.

[0194] In the above embodiment, the separate disassembly of the battery assembly 22 can be realized without disassembling the front cabin assembly 21, the rear floor assembly 23 from the upper vehicle body 10, which greatly improves the disassembly and assembly convenience, is beneficial to improving the replacement and repair efficiency, and improves the user experience.

[0195] Next, the vehicle body structure 100 according to some specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0196] Please refer to Figures 1 - 7, according to some specific embodiments of the present invention, the vehicle body structure 100 includes an upper vehicle body 10 and a lower vehicle body 20. The lower vehicle body 20 includes a front cabin assembly 21, a battery assembly 22, and a rear floor assembly 23, which are combined in a three-section structure of front, middle, and rear. The front cabin assembly 21 and the battery assembly 22 are connected by bolts from bottom to top, and the rear floor assembly 23 and the battery assembly 22 are connected by bolts from bottom to top, so that the battery assembly 22 can be detached later without being blocked. The front cabin assembly 21 and the battery assembly 22, and the rear floor assembly 23 and the battery assembly 22 are weakly connected by butyl mastic glue to achieve sealing. The upper vehicle body 10 and the lower vehicle body 20 are weakly connected by butyl mastic glue and connected by bolts from bottom to top to achieve the airtightness and water sealing performance of the passenger compartment.

[0197] The specific disassembly and assembly process of the vehicle body structure 100 includes:

[0198] Combine the three sections of the front cabin assembly 21, the battery assembly 22, and the rear floor assembly 23. Apply butyl mastic 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;

[0199] Apply butyl mastic at the connection between the lower vehicle body 20 and the upper vehicle body 10 and connect them with bolts to obtain the vehicle body structure 100, which is convenient for subsequent assembly into a complete vehicle. The butyl mastic applied twice fuses and cures with each other;

[0200] When the battery assembly 22 needs to be repaired, lift the whole vehicle and support the area of the battery assembly 22 from the lower side;

[0201] Remove the bolts associated with the battery assembly 22 to decouple the battery assembly 22 independently, and the seal 40 corresponding to the perimeter of the battery assembly 22 is damaged;

[0202] When reassembling, apply butyl mastic in a closed loop on the battery assembly 22, and increase the amount of butyl mastic at the joints with the first seal part 411 and the second seal part 412 that are not disassembled;

[0203] Move the battery assembly 22 to the position where it mates with the upper vehicle body 10, and tighten the bolts to fix the battery assembly 22 to complete the installation.

[0204] In the above embodiment, the battery assembly 22 can be decoupled independently to achieve independent disassembly, which is convenient for later maintenance and replacement. And the battery assembly 22 can achieve good airtight and water sealing effects in the installed state.

[0205] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0206] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An underbody of a vehicle body structure, characterized in that, the underbody includes: a front compartment assembly, a battery assembly, and a rear floor assembly. The front part of the battery assembly is detachably engaged with the front compartment assembly, and the rear part is detachably engaged with the rear floor assembly. The battery assembly is adapted to be detachably engaged with the upper body of the vehicle body structure relative to the front compartment assembly and the rear floor assembly separately.

2. The underbody of the vehicle body structure according to claim 1, characterized in that, the front part of the battery assembly abuts against the front compartment assembly, and / or the rear part of the battery assembly abuts against the rear floor assembly.

3. The underbody of the vehicle body structure according to claim 1 or 2, characterized in that, the front compartment assembly includes a first connecting part, which is located on one side of the front part of the battery assembly in the left-right direction. A first connecting member is detachably inserted through the first connecting part and the battery assembly in the left-right direction; the rear floor assembly includes a second connecting part, which is located on one side of the rear part of the battery assembly in the left-right direction. A second connecting member is detachably inserted through the second connecting part and the battery assembly in the left-right direction.

4. The underbody of the vehicle body structure according to claim 3, characterized in that, a first sealing member is provided between the side surface of the front part of the battery assembly and the first connecting part; a second sealing member is provided between the side surface of the rear part of the battery assembly and the second connecting part.

5. The underbody of the vehicle body structure according to claim 1 or 2, characterized in that, the front part of the battery assembly is located below the front compartment assembly, and the rear part is located below the rear floor assembly. The battery assembly is provided with a first connecting structure for connecting with at least one of the front compartment assembly and the rear floor assembly. The first connecting structure is adapted to be disassembled and assembled in the up-down direction.

6. The underbody of the vehicle body structure according to claim 5, characterized in that, a first sealing member is provided between the upper surface of the front part of the battery assembly and the front compartment assembly; a second sealing member is provided between the upper surface of the rear part of the battery assembly and the rear floor assembly.

7. The underbody of the vehicle body structure according to claim 5 or 6, characterized in that, the first connecting structure is fixed to the battery assembly and is adapted to be connected to the front compartment assembly or the rear floor assembly from bottom to top.

8. The underbody of the vehicle body structure according to claim 5 or 6, characterized in that, the first connecting structure includes a first fastener and a first mounting hole provided in the battery assembly. The first mounting hole extends vertically. The first fastener is inserted upward through the first mounting hole and is connected to the front compartment assembly or the rear floor assembly.

9. The underbody of the vehicle body structure according to claim 8, characterized in that, the battery assembly is provided with a first avoidance hole located below the first mounting hole and communicating with the first mounting hole. The diameter of the first avoidance hole is larger than the outer diameter of the first fastener.

10. The underbody of the vehicle body structure according to claim 4 or 6, characterized in that, The first seal and / or the second seal is an elastic sealing ring, and the elastic sealing ring is used for pressing and fitting with the battery assembly.

11. The lower vehicle body of the vehicle body structure according to claim 4 or 6, characterized in that the first seal and / or the second seal is an adhesive, and the adhesive is used for adhesively fitting with the battery assembly.

12. The lower vehicle body of the vehicle body structure according to claim 11, characterized in that the material of the adhesive includes butyl mastic.

13. The lower vehicle body of the vehicle body structure according to any one of claims 1-12, characterized in that the battery assembly includes a box body and battery cells arranged in the box body, and the box body includes: a frame body, the frame body includes a sill beam, and the front cabin assembly and the rear floor assembly are respectively connected to the frame body; a bottom plate, and the periphery of the bottom plate is connected to the lower end of the frame body.

14. The lower vehicle body of the vehicle body structure according to claim 13, characterized in that 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.

15. The lower vehicle body of the vehicle body structure according to claim 14, characterized in that the cover body includes a front floor.

16. A vehicle body structure, characterized in that it includes an upper vehicle body and the lower vehicle body of the vehicle body structure according to any one of claims 1-15, and the lower vehicle body is installed on the lower side of the upper vehicle body to cooperate to define an occupant compartment.

17. The vehicle body structure according to claim 16, characterized in that the upper surface of at least part 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, characterized in that a plurality of the mating surfaces are provided on the side wall, and the plurality of mating surfaces are arranged along the inner and outer directions of the side wall and are arranged at different heights in the up and down directions.

19. The vehicle body structure according to any one of claims 16-17, characterized in that 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 in the up and down directions.

20. The vehicle body structure according to claim 19, characterized in that the second connection structure includes a second fastener and a second mounting hole provided in 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 vehicle body.

21. The vehicle body structure according to claim 19, characterized in that the second connection structure is fixed to the battery assembly and is suitable for connecting to the upper vehicle body from bottom to top.

22. The vehicle body structure according to any one of claims 16-21, characterized in that it includes a third seal, the third seal extends along the circumference of the occupant compartment and seals the gap between the lower vehicle body and the upper vehicle body, the front part of the third seal is in sealing cooperation with the front cabin assembly, the middle part of the third seal is in sealing cooperation with the middle part of the battery assembly, and the rear part of the third seal is in sealing cooperation with the rear floor assembly.

23. A vehicle, characterized in that it includes the vehicle body structure according to any one of claims 16-22.

24. A disassembly and assembly method for a lower vehicle body, characterized in that, the lower vehicle body is the lower vehicle body of the vehicle body structure as described in any one of claims 1-15, and the disassembly and assembly method includes a disassembly process of separately disassembling the battery assembly, and the disassembly process includes: releasing the connections of the battery assembly with the front compartment assembly, the rear floor assembly, and the upper vehicle body respectively; lowering the battery assembly and releasing the seals between the battery assembly and the front compartment assembly, the rear floor assembly, and the upper vehicle body respectively, so as to achieve the separate disassembly of the battery assembly.

25. The disassembly and assembly method for the lower vehicle body as described in claim 24, characterized in that, the disassembly and assembly method includes a reassembly process of the battery assembly, and the reassembly process includes: providing a seal along the circumferential direction of the battery assembly on the battery assembly; installing the battery assembly upward on the front compartment assembly, the rear floor assembly, and the upper vehicle body, and sealing the front part of the seal with the front compartment assembly, sealing the rear part of the seal with the rear floor assembly, and sealing the middle part of the seal with the upper vehicle body.

26. A disassembly and assembly method for a lower vehicle body, characterized in that, the lower vehicle body is the lower vehicle body of the vehicle body structure as described in any one of claims 1-15, and the disassembly and assembly method includes an assembly process of the lower vehicle body, and the assembly process includes: providing a first seal at the front part of the battery assembly and a second seal at the rear part of the battery assembly; detachably installing the battery assembly between the front compartment assembly and the rear floor assembly, and making the first seal seal the gap between the front part of the battery assembly and the front compartment assembly, and making the second seal seal the gap between the rear part of the battery assembly and the rear floor assembly.

27. The disassembly and assembly method for the lower vehicle body as described in claim 26, characterized in that, 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: providing a third seal extending around the occupant compartment on the upper side of the lower vehicle body; installing the lower vehicle body upward on the lower side of the upper vehicle body, and making the third seal seal the gap between the lower vehicle body and the upper vehicle body.

28. The disassembly and assembly method for the lower vehicle body as described in claim 26, characterized in that, the disassembly and assembly method includes a disassembly process of separately disassembling the battery assembly, and the disassembly process includes: releasing the connections of the battery assembly with the front compartment assembly, the rear floor assembly, and the upper vehicle body respectively; lowering the battery assembly and releasing the seals between the battery assembly and the front compartment assembly, the rear floor assembly, and the upper vehicle body respectively, so as to achieve the separate disassembly of the battery assembly.

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