Platform sliding plate chassis

Abstract

The platform sliding plate chassis comprises a lower vehicle body assembly, a front auxiliary frame assembly, a battery tray assembly and a rear auxiliary frame assembly, and the lower vehicle body assembly comprises a front anti-collision beam assembly, a front longitudinal beam assembly, a front wall connecting mechanism, a threshold beam assembly, a rear wall connecting mechanism, a rear floor frame assembly and a rear anti-collision beam assembly which are sequentially connected; the front auxiliary frame assembly comprises a front auxiliary frame assembly and a front auxiliary frame connecting device, and the upper end of the front auxiliary frame connecting device is connected with the lower surface of the front longitudinal beam assembly; the battery tray assembly comprises a battery tray frame assembly, a battery pack bottom plate assembly and a battery tray connecting mechanism, the battery pack bottom plate assembly is arranged below the battery tray frame assembly, and the battery tray connecting mechanism is connected with the doorsill beam assembly; the rear auxiliary frame assembly comprises a rear auxiliary frame frame assembly, and the rear auxiliary frame frame assembly is connected with the rear floor frame assembly. The structure is simple, the weight is light, the cost is low, the strength is high, and compared with an aluminum alloy casting technology, the technology is simple, and the development period is short.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles and specifically discloses a platform skateboard chassis. Background Art

[0002] As an innovative chassis design, the skateboard chassis, with its highly integrated design and the characteristics of separation and decoupling of the upper and lower bodies, helps to reduce development costs, shorten development cycles, and improve space utilization, thereby enhancing the market competitiveness of the skateboard chassis. With the popularization of new energy vehicles and the maturity of advanced technologies such as intelligent perception, multi-domain control, and wire control, the skateboard chassis, as a carrier of these technologies, is expected to be enthusiastically sought after by the automotive industry. At present, the research and development of skateboard chassis mainly consists of two forms: cast structural parts plus extruded longitudinal beams and fully extruded profiles. Brands such as Nezha Auto and Avita have clearly stated that future new models will adopt skateboard chassis, all in the form of castings plus extruded profiles. At present, skateboard chassis mostly use die-cast aluminum alloy castings, but due to their complex structure and large size, the mold development cycle is long. At the same time, the material properties of the cast structure of aluminum alloy are low, which has a certain impact on the performance of the vehicle body. In addition, the technical development of aluminum alloy die-castings has reached a certain level, and it is difficult to make breakthrough progress in the short term, which limits the development cycle of new energy vehicles. The complexity of die casting structure design, long mold opening and trial mold cycle, high mold opening cost and low material performance, especially the mold cost of castings is as high as 1-2 million yuan, and the yield strength of die-cast aluminum alloy castings is low. In view of the above problems, it is necessary to study and design a new platform skateboard chassis to overcome the problems existing in the existing automobile chassis production. Summary of the invention

[0003] The invention provides a platformized skateboard chassis to solve the problems of long development cycle, high cost and low yield strength of die-cast aluminum alloy castings for automobile chassis.

[0004] The present invention provides a platform skateboard chassis, comprising

[0005] The lower body assembly includes a front anti-collision beam assembly, a front longitudinal beam assembly, a front wall connection mechanism, a door sill beam assembly, a rear wall connection mechanism, a rear floor frame assembly and a rear anti-collision beam assembly which are connected in sequence;

[0006] A front sub-frame assembly, comprising a front sub-frame frame assembly and a front sub-frame connecting device, wherein the front sub-frame connecting device is connected to the front sub-frame frame assembly, and the upper end of the front sub-frame connecting device is connected to the lower surface of the front longitudinal beam assembly;

[0007] The battery tray assembly includes a battery tray frame assembly, a battery pack bottom plate assembly, and a battery tray connection mechanism. The battery pack bottom plate assembly is disposed below the battery tray frame assembly, and the battery tray connection mechanism is disposed outside the battery tray frame assembly. The battery tray connection mechanism is connected to the sill beam assembly;

[0008] The rear subframe assembly includes a rear subframe frame assembly, and the rear subframe frame assembly is connected to the rear floor frame assembly.

[0009] A platformized skateboard chassis according to some embodiments of the present application. The front bumper beam assembly includes a front bumper beam, a first energy-absorbing column, a second energy-absorbing column, a third energy-absorbing column, a fourth energy-absorbing column, a first front bumper beam connection assembly, and a second front bumper beam connection assembly. The front bumper beam is a hollow profile with a middle bent outward. One end of the first energy-absorbing column and one end of the second energy-absorbing column are respectively connected to the left side of the front bumper beam. One end of the third energy-absorbing column and one end of the fourth energy-absorbing column are respectively connected to the right side of the front bumper beam. The first front bumper beam connection assembly includes a first front bumper beam connecting plate and a first front longitudinal beam connecting plate connected to each other. The first front bumper beam connecting plate is connected to the other ends of the first energy-absorbing column and the second energy-absorbing column. The second front bumper beam connection assembly includes a second front bumper beam connecting plate and a second front longitudinal beam connecting plate connected to each other. The second front bumper beam connecting plate is connected to the other ends of the third energy-absorbing column and the fourth energy-absorbing column;

[0010] The front longitudinal beam assembly includes a first front longitudinal beam and a second front longitudinal beam. One end of the first front longitudinal beam is connected to the first front longitudinal beam connecting plate, and one end of the second front longitudinal beam is connected to the second front longitudinal beam connecting plate;

[0011] The front enclosure connection mechanism includes a front enclosure lower cross beam, a first front floor connecting beam, and a second front floor connecting beam. The first front floor connecting beam and the second front floor connecting beam are respectively disposed at the left and right ends of the front enclosure lower cross beam. The other end of the first front longitudinal beam is connected to the first front floor connecting beam, and the other end of the second front longitudinal beam is connected to the second front floor connecting beam;

[0012] The sill beam assembly includes a first inner sill beam, a second inner sill beam, a first outer sill beam, and a second outer sill beam. One end of the first inner sill beam is connected to the first front floor connecting beam. The first outer sill beam is disposed outside the first inner sill beam. One end of the second inner sill beam is connected to the second front floor connecting beam. The second outer sill beam is disposed outside the second inner sill beam;

[0013] The rear enclosure connection mechanism includes a rear enclosure lower crossbeam, a first rear floor connection beam, and a second rear floor connection beam. The first rear floor connection beam and the second rear floor connection beam are respectively arranged at the left and right ends of the rear enclosure lower crossbeam. The other end of the first inner sill beam is connected to the first rear floor connection beam, and the other end of the second inner sill beam is connected to the second rear floor connection beam;

[0014] The rear floor frame assembly includes a first rear longitudinal beam, a second rear longitudinal beam, a first rear crossbeam, and a second rear crossbeam. One end of the first rear longitudinal beam is connected to the first rear floor connection beam, and one end of the second rear longitudinal beam is connected to the second rear floor connection beam. The first rear crossbeam is connected to the rear enclosure lower crossbeam, and the left and right ends of the first rear crossbeam are respectively connected to the first rear floor connection beam and the second rear floor connection beam. One end of the second rear crossbeam is connected to the first rear longitudinal beam, and the other end of the second rear crossbeam is connected to the second rear longitudinal beam;

[0015] The rear anti-collision beam assembly includes a rear anti-collision beam, a first rear anti-collision beam connection component, and a second rear anti-collision beam connection component. The rear anti-collision beam is a hollow profile with a middle bent outward. The first rear anti-collision beam connection component includes a first rear anti-collision beam connecting plate and a first rear longitudinal beam connecting plate connected to each other. The first rear anti-collision beam connecting plate is connected to one side of the rear anti-collision beam, and the other end of the first rear longitudinal beam is connected to the first rear longitudinal beam connecting plate. The second rear anti-collision beam connection component includes a second rear anti-collision beam connecting plate and a second rear longitudinal beam connecting plate connected to each other. The second rear anti-collision beam connecting plate is connected to the other side of the rear anti-collision beam, and the other end of the second rear longitudinal beam is connected to the second rear longitudinal beam connecting plate.

[0016] A platformized skateboard chassis according to some embodiments of the present application. The first front longitudinal beam is provided with a first shock tower, and the second front longitudinal beam is provided with a second shock tower. The first shock tower includes a first shock tower connecting plate and a first shock tower cover plate connected to each other. The first shock tower connecting plate is connected to the first front longitudinal beam. The second shock tower includes a second shock tower connecting plate and a second shock tower cover plate connected to each other. The second shock tower connecting plate is connected to the second front longitudinal beam;

[0017] The first shock tower connecting plate and the first shock tower cover plate are connected by welding. The first shock tower connecting plate and the first front longitudinal beam are connected by welding. The second shock tower connecting plate and the second shock tower cover plate are connected by welding. The second shock tower connecting plate and the second front longitudinal beam are connected by welding;

[0018] The first rear longitudinal beam is provided with a first rear wheel housing, and the second rear longitudinal beam is provided with a second rear wheel housing. The first rear wheel housing includes a first rear wheel housing connecting plate, a second rear wheel housing connecting plate, and a first rear wheel housing cover plate. The upper ends of the first rear wheel housing connecting plate and the second rear wheel housing connecting plate are respectively connected to the left and right ends of the first rear wheel housing cover plate, and the lower ends of the first rear wheel housing connecting plate and the second rear wheel housing connecting plate are respectively connected to the first rear longitudinal beam. The second rear wheel housing includes a third rear wheel housing connecting plate, a fourth rear wheel housing connecting plate, and a second rear wheel housing cover plate. The upper ends of the third rear wheel housing connecting plate and the fourth rear wheel housing connecting plate are respectively connected to the left and right ends of the second rear wheel housing cover plate, and the lower ends of the third rear wheel housing connecting plate and the fourth rear wheel housing connecting plate are respectively connected to the second rear longitudinal beam;

[0019] A first rear subframe rear mounting beam is provided below the first rear longitudinal beam, and a second rear subframe rear mounting beam is provided below the second rear longitudinal beam. The first rear subframe rear mounting beam and the second rear subframe rear mounting beam are used to connect to the rear subframe frame assembly.

[0020] For a platformized skateboard chassis according to some embodiments of the present application, the front anti-collision beam is internally provided with reinforcing ribs, and the front anti-collision beam is an aluminum alloy extrusion profile and is obtained by an extrusion method;

[0021] The first energy-absorbing column, the second energy-absorbing column, the third energy-absorbing column, and the fourth energy-absorbing column are all square tube structures and are internally provided with reinforcing ribs. The first energy-absorbing column, the second energy-absorbing column, the third energy-absorbing column, and the fourth energy-absorbing column are all aluminum alloy extrusion profiles and are all obtained by an extrusion method. The first energy-absorbing column, the second energy-absorbing column, the third energy-absorbing column, and the fourth energy-absorbing column are welded to the front anti-collision beam, and the first energy-absorbing column and the second energy-absorbing column are welded to the first front anti-collision beam connecting plate, and the third energy-absorbing column and the fourth energy-absorbing column are welded to the second front anti-collision beam connecting plate;

[0022] The first front anti-collision beam connecting plate is connected to the first front longitudinal beam connecting plate by bolts, and the second front anti-collision beam connecting plate and the second front longitudinal beam connecting plate are connected by bolts;

[0023] The first front longitudinal beam and the second front longitudinal beam are both square tube structures and are internally provided with reinforcing ribs. The first front longitudinal beam and the second front longitudinal beam are both aluminum alloy extrusion profiles and are all obtained by an extrusion method. The first front longitudinal beam is welded to the first front longitudinal beam connecting plate and the first front floor connecting beam, and the second front longitudinal beam is welded to the second front longitudinal beam connecting plate and the second front floor connecting beam;

[0024] The front under beam, the first front floor connecting beam, and the second front floor connecting beam are all hollow profiles with reinforcing ribs inside. The front under beam, the first front floor connecting beam, and the second front floor connecting beam are all aluminum alloy extrusion profiles and are all made by extrusion. The first front floor connecting beam and the second front floor connecting beam are connected to the front under beam by welding;

[0025] The first inner sill beam, the second inner sill beam, the first outer sill beam, and the second outer sill beam are all square tube structures with reinforcing ribs inside. The first inner sill beam, the second inner sill beam, the first outer sill beam, and the second outer sill beam are all aluminum alloy extrusion profiles and are all made by extrusion. The first inner sill beam is connected to the first front floor connecting beam and the first rear floor connecting beam by welding. The first outer sill beam is connected to the first inner sill beam by welding. The second inner sill beam is connected to the second front floor connecting beam and the second rear floor connecting beam by welding. The second outer sill beam is connected to the second inner sill beam by welding;

[0026] The rear under beam, the first rear floor connecting beam, and the second rear floor connecting beam are all square tubes with reinforcing ribs inside. The rear under beam, the first rear floor connecting beam, and the second rear floor connecting beam are all aluminum alloy extrusion profiles and are all made by extrusion. The first rear floor connecting beam and the second rear floor connecting beam are connected to the rear under beam by welding;

[0027] The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all square tubes with reinforcing ribs inside. The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all aluminum alloy extrusion profiles and are all made by extrusion. The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all connected to each other by welding;

[0028] The rear anti-collision beam has reinforcing ribs inside. The rear anti-collision beam is an aluminum alloy extrusion profile and is made by extrusion;

[0029] The first rear anti-collision beam connecting plate is connected to the first rear longitudinal beam connecting plate by bolts. The first rear anti-collision beam connecting plate is connected to the rear anti-collision beam by welding. The first rear longitudinal beam connecting plate is connected to the first rear longitudinal beam by welding. The second rear anti-collision beam connecting plate and the second rear longitudinal beam connecting plate are connected by bolts. The second rear anti-collision beam connecting plate is connected to the rear anti-collision beam by welding. The second rear longitudinal beam connecting plate is connected to the second rear longitudinal beam by welding.

[0030] A platform skateboard chassis according to some embodiments of the present application, the front subframe connecting device includes a first front subframe connecting member, a second front subframe connecting member, a third front subframe connecting member and a fourth front subframe connecting member. The first front subframe connecting member and the third front subframe connecting member are bolted to the first front longitudinal beam, and the second front subframe connecting member and the fourth front subframe connecting member are bolted to the second front longitudinal beam;

[0031] The front subframe frame assembly includes a first front subframe longitudinal beam, a second front subframe longitudinal beam, a first front subframe cross beam, a second front subframe cross beam and a front subframe rear cross beam. One end of the first front subframe cross beam is connected to one end of the first front subframe longitudinal beam through the first front subframe connecting member. A groove is provided at the other end of the first front subframe longitudinal beam. One end of the front subframe rear cross beam is connected to the groove of the first front subframe longitudinal beam. The other end of the first front subframe cross beam is connected to one end of the second front subframe longitudinal beam through the second front subframe connecting member. A groove is provided at the other end of the second front subframe longitudinal beam. The other end of the front subframe rear cross beam is connected to the groove of the second front subframe longitudinal beam. One end of the second front subframe cross beam is connected to the first front subframe longitudinal beam through the third front subframe connecting member. The other end of the second front subframe cross beam is connected to the second front subframe longitudinal beam through the fourth front subframe connecting member. The second front subframe cross beam is disposed between the first front subframe cross beam and the front subframe rear cross beam.

[0032] A platform skateboard chassis according to some embodiments of the present application, the first front subframe longitudinal beam is a square tube structure and is provided with reinforcing ribs inside. The first front subframe longitudinal beam is an aluminum alloy extrusion profile and is made by extrusion. A first front swing arm is provided outside the first front subframe longitudinal beam. The first front swing arm is connected to the first front subframe longitudinal beam through a first front subframe swing arm mounting bracket. The first front subframe swing arm mounting bracket is welded to the first front subframe longitudinal beam. The first front swing arm is bolted to the first front subframe swing arm mounting bracket. The first front swing arm is an aluminum alloy extrusion profile and is made by extrusion;

[0033] The second front subframe longitudinal beam is a square tube structure and is provided with reinforcing ribs inside. The second front subframe longitudinal beam is an aluminum alloy extrusion profile and is made by extrusion. A second front swing arm is provided outside the second front subframe longitudinal beam. The second front swing arm is connected to the second front subframe longitudinal beam through a second front subframe swing arm mounting bracket. The second front subframe swing arm mounting bracket is welded to the second front subframe longitudinal beam. The second front swing arm is bolted to the second front subframe swing arm mounting bracket. The second front swing arm is an aluminum alloy extrusion profile and is made by extrusion;

[0034] The first front subframe connecting member, the second front subframe connecting member, the third front subframe connecting member, and the fourth front subframe connecting member are all aluminum alloy extrusion profiles, which are obtained by extrusion. The first front subframe connecting member is welded to the first front subframe cross member and the first front subframe longitudinal member. The second front subframe connecting member is welded to the first front subframe cross member and the second front subframe longitudinal member. The third front subframe connecting member is welded to the second front subframe cross member and the first front subframe longitudinal member. The fourth front subframe connecting member is welded to the second front subframe cross member and the second front subframe longitudinal member;

[0035] The first front subframe cross member, the second front subframe cross member, and the rear subframe cross member are all aluminum alloy extrusion profiles, which are obtained by extrusion. The rear subframe cross member is welded to the first front subframe cross member and the second front subframe cross member.

[0036] A platformized skateboard chassis according to some embodiments of the present application. The battery tray frame assembly includes a battery pack front beam, a battery pack left beam, a battery pack rear beam, a battery pack right beam, and a battery pack middle beam assembly. The battery pack front beam, the battery pack left beam, the battery pack rear beam, and the battery pack right beam are sequentially connected to form a battery pack frame material. The battery pack middle beam assembly includes a first battery pack middle beam and a second battery pack middle beam. The left and right ends of the first battery pack middle beam are respectively connected to the battery pack left beam and the battery pack right beam. The left and right ends of the second battery pack middle beam are respectively connected to the battery pack left beam and the battery pack right beam. The first battery pack middle beam and the second battery pack middle beam are evenly arranged between the battery pack front beam and the battery pack rear beam;

[0037] The battery pack bottom plate assembly includes a first battery pack bottom plate, a second battery pack bottom plate, and a third battery pack bottom plate. The first battery pack bottom plate is arranged between the battery pack front beam and the first battery pack middle beam. The second battery pack bottom plate is arranged between the first battery pack middle beam and the second battery pack middle beam. The third battery pack bottom plate is arranged between the second battery pack middle beam and the battery pack rear beam;

[0038] The battery tray connection mechanism includes a battery pack front mounting beam, a battery pack left mounting beam, a battery pack rear mounting beam, and a battery pack right mounting beam. The battery pack front mounting beam is arranged at the front end of the battery pack front beam. The battery pack left mounting beam is arranged at the left end of the battery pack left beam. The battery pack rear mounting beam is arranged at the rear end of the battery pack rear beam. The battery pack right mounting beam is arranged at the right end of the battery pack right beam.

[0039] A platform skateboard chassis according to some embodiments of the present application, wherein the front battery pack beam, the left battery pack beam, the rear battery pack beam, and the right battery pack beam are all square tube structures and are provided with reinforcing ribs inside. The front battery pack beam, the left battery pack beam, the rear battery pack beam, and the right battery pack beam are all aluminum alloy extrusion profiles and are all made by extrusion;

[0040] The front battery pack mounting beam is a hollow profile and is provided with reinforcing ribs inside. The front battery pack mounting beam is an aluminum alloy extrusion profile and is made by extrusion. The front battery pack mounting beam is connected to the front battery pack beam by welding;

[0041] The left battery pack mounting beam is a hollow profile and is provided with reinforcing ribs inside. The left battery pack mounting beam is an aluminum alloy extrusion profile and is made by extrusion. The left battery pack mounting beam is connected to the left battery pack beam by welding;

[0042] The rear battery pack mounting beam is a hollow profile and is provided with reinforcing ribs inside. The rear battery pack mounting beam is an aluminum alloy extrusion profile and is made by extrusion. The rear battery pack mounting beam is connected to the rear battery pack beam by welding;

[0043] The right battery pack mounting beam is a hollow profile and is provided with reinforcing ribs inside. The right battery pack mounting beam is an aluminum alloy extrusion profile and is made by extrusion. The right battery pack mounting beam is connected to the right battery pack beam by welding;

[0044] The first battery pack middle beam and the second battery pack middle beam are both square tube structures and are provided with reinforcing ribs inside. The first battery pack middle beam and the second battery pack middle beam are both aluminum alloy extrusion profiles and are both made by extrusion. The first battery pack middle beam and the second battery pack middle beam are connected to the left battery pack beam and the left battery pack beam by welding.

[0045] A platform skateboard chassis according to some embodiments of the present application, wherein the rear subframe frame assembly includes a first rear subframe cross beam, a second rear subframe cross beam, a first rear subframe longitudinal beam, a second rear subframe longitudinal beam, a rear subframe tie rod mounting bracket, a rear subframe tie rod, a lower control arm mounting bracket, and a lower control arm. The first rear subframe cross beam and the second rear subframe cross beam are arranged in parallel. One end of the first rear subframe cross beam and the second rear subframe cross beam is welded to the first rear subframe longitudinal beam. One end of the first rear subframe cross beam and the second rear subframe cross beam is welded to the second rear subframe longitudinal beam. Two groups of rear subframe tie rod mounting brackets are provided on the upper surfaces of the first rear subframe longitudinal beam and the second rear subframe longitudinal beam. The rear subframe tie rods are provided on the rear subframe tie rod mounting brackets. Lower control arm mounting brackets are provided on the lower surfaces of the first rear subframe longitudinal beam and the second rear subframe longitudinal beam. The lower control arms are provided on the lower control arm mounting brackets.

[0046] A platform skateboard chassis according to some embodiments of the present application. The first rear subframe crossbeam and the second rear subframe crossbeam are both square tube structures and are both provided with reinforcing ribs inside. The first rear subframe crossbeam and the second rear subframe crossbeam are both aluminum alloy extruded profiles and are both made by extrusion;

[0047] The middle parts of the first rear subframe longitudinal beam and the second rear subframe longitudinal beam are both concave inward toward the first rear subframe crossbeam and the second rear subframe crossbeam. The first rear subframe longitudinal beam and the second rear subframe longitudinal beam are both aluminum alloy extruded profiles and are both made by extrusion;

[0048] The first rear subframe crossbeam and the second rear subframe crossbeam are connected to the first rear subframe longitudinal beam by welding;

[0049] The first rear subframe crossbeam and the second rear subframe crossbeam are connected to the second rear subframe longitudinal beam by welding;

[0050] The rear subframe tie rod mounting bracket is connected to the first rear subframe crossbeam or the second rear subframe crossbeam by welding;

[0051] The rear subframe tie rod is connected to the rear subframe tie rod mounting bracket by bolts;

[0052] The lower control arm mounting bracket is connected to the first rear subframe crossbeam or the second rear subframe crossbeam by welding;

[0053] The lower control arm is connected to the lower control arm mounting bracket by bolts.

[0054] A platform skateboard chassis proposed by the present invention uses aluminum alloy extruded profiles. The entire chassis has a simple structure, low weight, low cost and high strength. Compared with the aluminum alloy casting process, it is simple and has a shorter development cycle. In addition, the present invention has an obvious weight reduction effect compared with steel parts, and solves the problems of difficult lightweight of automotive chassis structural parts, complex preparation process and long development cycle. The overall structure of the chassis adopts a "well" shape, which can transmit force smoothly. When a collision occurs, the protection system transmits the impact force to the front anti-collision beam assembly and the front longitudinal beam assembly, and then transmits the force to the sill beam assembly through the front panel connection mechanism. Such a structure will not squeeze the battery pack in the middle of the car, thereby playing a role in protecting the battery pack. In addition, the present invention can improve energy efficiency, reduce energy consumption, and has significant advantages in improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a three-dimensional structural schematic diagram of a platform skateboard chassis according to an embodiment of the present invention;

[0056] Figure 2Schematic three-dimensional structure diagram of the vehicle body assembly in the embodiment of the present invention;

[0057] Figure 3 Schematic three-dimensional structure diagram of the first front anti-collision beam connection plate in the embodiment of the present invention;

[0058] Figure 4 Schematic three-dimensional structure diagram of the second front anti-collision beam connection plate in the embodiment of the present invention;

[0059] Figure 5 Schematic three-dimensional structure diagram of the first rear anti-collision beam connection assembly in the embodiment of the present invention;

[0060] Figure 6 Schematic three-dimensional structure diagram of the second rear anti-collision beam connection assembly in the embodiment of the present invention;

[0061] Figure 7 Schematic three-dimensional structure diagram of the first rear wheel housing in the embodiment of the present invention;

[0062] Figure 8 Schematic three-dimensional structure diagram of the second rear wheel housing in the embodiment of the present invention;

[0063] Figure 9 Schematic three-dimensional structure diagram of the front subframe assembly in the embodiment of the present invention;

[0064] Figure 10 Schematic three-dimensional structure diagram of the battery tray assembly in the embodiment of the present invention;

[0065] Figure 11 Schematic left view structure diagram of the battery tray frame assembly in the embodiment of the present invention;

[0066] Figure 12 Schematic three-dimensional structure diagram of the rear subframe assembly in the embodiment of the present invention.

[0067] In the figure, 1. Lower body assembly, 1-1. Front anti-collision beam, 1-2. First energy-absorbing column, 1-3. Second energy-absorbing column, 1-4. Third energy-absorbing column, 1-5. Fourth energy-absorbing column, 1-6. First front anti-collision beam connecting plate, 1-7. First front longitudinal beam connecting plate, 1-8. Second front anti-collision beam connecting plate, 1-9. Second front longitudinal beam connecting plate, 1-10. First front longitudinal beam, 1-11. Second front longitudinal beam, 1-12. Lower front cross beam, 1-13. First front floor connecting beam, 1-14. Second front floor connecting beam, 1-15. First inner sill beam, 1-16. Second inner sill beam, 1-17. First outer sill beam, 1-18. Second outer sill beam, 1-19. Lower rear cross beam, 1-20. First rear floor connecting beam, 1-21. Second rear floor connecting beam, 1-22. First rear longitudinal beam, 1-23. Second rear longitudinal beam, 1-24. First rear cross beam, 1-25. Second rear cross beam, 1-26. Rear anti-collision beam, 1-27. First rear anti-collision beam connecting plate, 1-28. First rear longitudinal beam connecting plate, 1-29. Second rear anti-collision beam connecting plate, 1-30. Second rear longitudinal beam connecting plate, 1-31. First shock tower connecting plate, 1-32. First shock tower cover plate, 1-33. Second shock tower connecting plate, 1-34. Second shock tower cover plate, 1-35. First rear wheelhouse connecting plate, 1-36. Second rear wheelhouse connecting plate, 1-37. First rear wheelhouse cover plate, 1-38. Third rear wheelhouse connecting plate, 1-39. Fourth rear wheelhouse connecting plate, 1-40. Second rear wheelhouse cover plate, 1-41. First rear subframe rear mounting beam, 1-42. Second rear subframe rear mounting beam, 2. Front subframe assembly, 2-1. First front subframe connecting piece, 2-2. Second front subframe connecting piece, 2-3. Third front subframe connecting piece, 2-4. Fourth front subframe connecting piece, 2-5. First front subframe longitudinal beam, 2-6. Second front subframe longitudinal beam, 2-7. First front subframe cross beam, 2-8. Second front subframe cross beam, 2-9. Front subframe rear cross beam, 2-10. First front swing arm, 2-11. Second front swing arm, 2-12. First front subframe swing arm mounting bracket, 2-13. Second front subframe swing arm mounting bracket, 3. Battery tray assembly, 3-1. Battery pack front beam, 3-2. Battery pack left beam, 3-3. Battery pack rear beam, 3-4. Battery pack right beam, 3-5. First battery pack middle beam, 3-6. Second battery pack middle beam, 3-7. First battery pack bottom plate, 3-8. Second battery pack bottom plate, 3-9. Third battery pack bottom plate, 3-10. Battery pack front mounting beam, 3-11. Battery pack left mounting beam, 3-12. Battery pack rear mounting beam, 3-13. Battery pack right mounting beam, 4. Rear subframe assembly, 4-1. First rear subframe cross beam, 4-2. Second rear subframe cross beam, 4-3. First rear subframe longitudinal beam, 4-4. Second rear subframe longitudinal beam, 4-5. Rear subframe tie rod mounting bracket, 4-6. Rear subframe tie rod, 4-7. Lower arm mounting bracket, 4-8. Lower arm. Specific Embodiments

[0068] The following further describes in detail the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0069] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0070] This embodiment provides a platformized skateboard chassis, as Figure 1 shown, including a lower vehicle body assembly 1, a front subframe assembly 2, a battery tray assembly 3, and a rear subframe assembly 4. The lower vehicle body assembly 1 includes a front bumper beam assembly, a front longitudinal beam assembly, a front enclosure connection mechanism, a sill beam assembly, a rear enclosure connection mechanism, a rear floor frame assembly, and a rear bumper beam assembly connected in sequence; the front subframe assembly 2 includes a front subframe frame assembly and a front subframe connection device. The front subframe connection device is connected to the front subframe frame assembly, and the upper end of the front subframe connection device is connected to the lower surface of the front longitudinal beam assembly; the battery tray assembly 3 includes a battery tray frame assembly, a battery pack bottom plate assembly, and a battery tray connection mechanism. The battery pack bottom plate assembly is arranged below the battery tray frame assembly, and the battery tray connection mechanism is arranged outside the battery tray frame assembly. The battery tray connection mechanism is connected to the sill beam assembly; the rear subframe assembly 4 includes a rear subframe frame assembly, and the rear subframe frame assembly is connected to the rear floor frame assembly.

[0071] As a preference of this embodiment, specifically, as Figure 2As shown in the figure, the front anti-collision beam assembly includes a front anti-collision beam 1-1, a first energy-absorbing column 1-2, a second energy-absorbing column 1-3, a third energy-absorbing column 1-4, a fourth energy-absorbing column 1-5, a first front anti-collision beam connection assembly, and a second front anti-collision beam connection assembly. The front anti-collision beam 1-1 is a hollow profile with a middle bent outward. One end of the first energy-absorbing column 1-2 and one end of the second energy-absorbing column 1-3 are respectively connected to the left side of the front anti-collision beam 1-1. One end of the third energy-absorbing column 1-4 and one end of the fourth energy-absorbing column 1-5 are respectively connected to the right side of the front anti-collision beam 1-1. The first front anti-collision beam connection assembly includes a first front anti-collision beam connecting plate 1-6 and a first front longitudinal beam connecting plate 1-7 which are connected to each other. As Figure 3 shown, the first front anti-collision beam connecting plate 1-6 is connected to the other ends of the first energy-absorbing column 1-2 and the second energy-absorbing column 1-3. The second front anti-collision beam connection assembly includes a second front anti-collision beam connecting plate 1-8 and a second front longitudinal beam connecting plate 1-9 which are connected to each other. As Figure 4 shown, the second front anti-collision beam connecting plate 1-8 is connected to the other ends of the third energy-absorbing column 1-4 and the fourth energy-absorbing column 1-5. More preferably, the front anti-collision beam 1-1 is provided with reinforcing ribs inside, and the front anti-collision beam 1-1 is an aluminum alloy extrusion profile and is made by an extrusion method. The first energy-absorbing column 1-2, the second energy-absorbing column 1-3, the third energy-absorbing column 1-4, and the fourth energy-absorbing column 1-5 are all square tube structures and are provided with reinforcing ribs inside. The first energy-absorbing column 1-2, the second energy-absorbing column 1-3, the third energy-absorbing column 1-4, and the fourth energy-absorbing column 1-5 are all aluminum alloy extrusion profiles and are all made by an extrusion method. The first energy-absorbing column 1-2, the second energy-absorbing column 1-3, the third energy-absorbing column 1-4, and the fourth energy-absorbing column 1-5 are welded to the front anti-collision beam 1-1. The first energy-absorbing column 1-2 and the second energy-absorbing column 1-3 are welded to the first front anti-collision beam connecting plate 1-6. The third energy-absorbing column 1-4 and the fourth energy-absorbing column 1-5 are welded to the second front anti-collision beam connecting plate 1-8. The first front anti-collision beam connecting plate 1-6 and the first front longitudinal beam connecting plate 1-7 are connected by bolts. The second front anti-collision beam connecting plate 1-8 and the second front longitudinal beam connecting plate 1-9 are connected by bolts.

[0072] As a preference of this embodiment, specifically, as Figure 2As shown in the figure, the front longitudinal beam assembly includes a first front longitudinal beam 1-10 and a second front longitudinal beam 1-11. One end of the first front longitudinal beam 1-10 is connected to the first front longitudinal beam connecting plate 1-7, and one end of the second front longitudinal beam 1-11 is connected to the second front longitudinal beam connecting plate 1-9. The front panel connection mechanism includes a front panel lower cross beam 1-12, a first front floor connection beam 1-13, and a second front floor connection beam 1-14. The first front floor connection beam 1-13 and the second front floor connection beam 1-14 are respectively arranged at the left and right ends of the front panel lower cross beam 1-12. The other end of the first front longitudinal beam 1-10 is connected to the first front floor connection beam 1-13, and the other end of the second front longitudinal beam 1-11 is connected to the second front floor connection beam 1-14. More preferably, both the first front longitudinal beam 1-10 and the second front longitudinal beam 1-11 are square tube structures and are provided with reinforcing ribs inside. Both the first front longitudinal beam 1-10 and the second front longitudinal beam 1-11 are aluminum alloy extruded profiles and are made by extrusion. The first front longitudinal beam 1-10 is connected to the first front longitudinal beam connecting plate 1-7 and the first front floor connection beam 1-13 by welding. The second front longitudinal beam 1-11 is connected to the second front longitudinal beam connecting plate 1-9 and the second front floor connection beam 1-14 by welding. The front panel lower cross beam 1-12, the first front floor connection beam 1-13, and the second front floor connection beam 1-14 are all hollow profiles and are provided with reinforcing ribs inside. The front panel lower cross beam 1-12, the first front floor connection beam 1-13, and the second front floor connection beam 1-14 are all aluminum alloy extruded profiles and are made by extrusion. The first front floor connection beam 1-13 and the second front floor connection beam 1-14 are connected to the front panel lower cross beam 1-12 by welding.

[0073] As a preference of this embodiment, specifically, as Figure 2As shown in the figure, the sill beam assembly includes a first inner sill beam 1-15, a second inner sill beam 1-16, a first outer sill beam 1-17 and a second outer sill beam 1-18. One end of the first inner sill beam 1-15 is connected to the first front floor connecting beam 1-13. The first outer sill beam 1-17 is arranged outside the first inner sill beam 1-15. One end of the second inner sill beam 1-16 is connected to the second front floor connecting beam 1-14. The second outer sill beam 1-18 is arranged outside the second inner sill beam 1-16. More preferably, the first inner sill beam 1-15, the second inner sill beam 1-16, the first outer sill beam 1-17 and the second outer sill beam 1-18 are all square tube structures and are provided with reinforcing ribs inside. The first inner sill beam 1-15, the second inner sill beam 1-16, the first outer sill beam 1-17 and the second outer sill beam 1-18 are all aluminum alloy extruded profiles and are all made by extrusion. The first inner sill beam 1-15 is connected to the first front floor connecting beam 1-13 and the first rear floor connecting beam 1-20 by welding. The first outer sill beam 1-17 is connected to the first inner sill beam 1-15 by welding. The second inner sill beam 1-16 is connected to the second front floor connecting beam 1-14 and the second rear floor connecting beam 1-21 by welding. The second outer sill beam 1-18 is connected to the second inner sill beam 1-16 by welding.

[0074] As a preference of this embodiment, specifically, as Figure 2 shown in the figure, the rear enclosure connecting mechanism includes a rear enclosure lower cross beam 1-19, a first rear floor connecting beam 1-20 and a second rear floor connecting beam 1-21. The first rear floor connecting beam 1-20 and the second rear floor connecting beam 1-21 are respectively arranged at the left and right ends of the rear enclosure lower cross beam 1-19. The other end of the first inner sill beam 1-15 is connected to the first rear floor connecting beam 1-20. The other end of the second inner sill beam 1-16 is connected to the second rear floor connecting beam 1-21. More preferably, the rear enclosure lower cross beam 1-19, the first rear floor connecting beam 1-20 and the second rear floor connecting beam 1-21 are all square tubes and are provided with reinforcing ribs inside. The rear enclosure lower cross beam 1-19, the first rear floor connecting beam 1-20 and the second rear floor connecting beam 1-21 are all aluminum alloy extruded profiles and are all made by extrusion. The first rear floor connecting beam 1-20 and the second rear floor connecting beam 1-21 are connected to the rear enclosure lower cross beam 1-19 by welding.

[0075] As a preference of this embodiment, specifically, as Figure 2As shown in the figure, the rear floor frame assembly includes a first rear longitudinal beam 1-22, a second rear longitudinal beam 1-23, a first rear cross beam 1-24 and a second rear cross beam 1-25. One end of the first rear longitudinal beam 1-22 is connected to the first rear floor connecting beam 1-20, and one end of the second rear longitudinal beam 1-23 is connected to the second rear floor connecting beam 1-21. The first rear cross beam 1-24 is connected to the lower rear surround beam 1-19, and the left and right ends of the first rear cross beam 1-24 are respectively connected to the first rear floor connecting beam 1-20 and the second rear floor connecting beam 1-21. One end of the second rear cross beam 1-25 is connected to the first rear longitudinal beam 1-22, and the other end of the second rear cross beam 1-25 is connected to the second rear longitudinal beam 1-23. More preferably, the first rear longitudinal beam 1-22, the second rear longitudinal beam 1-23, the first rear cross beam 1-24 and the second rear cross beam 1-25 are all square tubes and are provided with reinforcing ribs inside. The first rear longitudinal beam 1-22, the second rear longitudinal beam 1-23, the first rear cross beam 1-24 and the second rear cross beam 1-25 are all aluminum alloy extruded profiles and are all made by extrusion. The first rear longitudinal beam 1-22, the second rear longitudinal beam 1-23, the first rear cross beam 1-24 and the second rear cross beam 1-25 are all connected by welding.

[0076] As a preference of this embodiment, specifically, as Figure 2 shown in the figure, the rear anti-collision beam assembly includes a rear anti-collision beam 1-26, a first rear anti-collision beam connection assembly and a second rear anti-collision beam connection assembly. The rear anti-collision beam 1-26 is a hollow profile with a middle part bent outward. As Figure 5 shown in the figure, the first rear anti-collision beam connection assembly includes a first rear anti-collision beam connecting plate 1-27 and a first rear longitudinal beam connecting plate 1-28 which are connected to each other. The first rear anti-collision beam connecting plate 1-27 is connected to one side of the rear anti-collision beam 1-26, and the other end of the first rear longitudinal beam 1-22 is connected to the first rear longitudinal beam connecting plate 1-28. As Figure 6 shown in the figure, the second rear anti-collision beam connection assembly includes a second rear anti-collision beam connecting plate 1-29 and a second rear longitudinal beam connecting plate 1-30 which are connected to each other. The second rear anti-collision beam connecting plate 1-29 is connected to the other side of the rear anti-collision beam 1-26, and the other end of the second rear longitudinal beam 1-23 is connected to the second rear longitudinal beam connecting plate 1-30. More preferably, the rear anti-collision beam 1-26 is provided with reinforcing ribs inside. The rear anti-collision beam 1-26 is an aluminum alloy extruded profile and is made by extrusion. The first rear anti-collision beam connecting plate 1-27 and the first rear longitudinal beam connecting plate 1-28 are connected by bolts. The first rear anti-collision beam connecting plate 1-27 and the rear anti-collision beam 1-26 are connected by welding. The first rear longitudinal beam connecting plate 1-28 and the first rear longitudinal beam 1-22 are connected by welding. The second rear anti-collision beam connecting plate 1-29 and the second rear longitudinal beam connecting plate 1-30 are connected by bolts. The second rear anti-collision beam connecting plate 1-29 and the rear anti-collision beam 1-26 are connected by welding. The second rear longitudinal beam connecting plate 1-30 and the second rear longitudinal beam 1-23 are connected by welding.

[0077] Preferably in this embodiment, specifically, the first front longitudinal beam 1-10 is provided with a first shock tower, and the second front longitudinal beam 1-11 is provided with a second shock tower. The first shock tower includes a first shock tower connecting plate 1-31 and a first shock tower cover plate 1-32 which are connected to each other. The first shock tower connecting plate 1-31 is connected to the first front longitudinal beam 1-10. The second shock tower includes a second shock tower connecting plate 1-33 and a second shock tower cover plate 1-34 which are connected to each other. The second shock tower connecting plate 1-33 is connected to the second front longitudinal beam 1-11. More preferably, the first shock tower connecting plate 1-31 and the first shock tower cover plate 1-32 are connected by welding, the first shock tower connecting plate 1-31 and the first front longitudinal beam 1-10 are connected by welding, the second shock tower connecting plate 1-33 and the second shock tower cover plate 1-34 are connected by welding, and the second shock tower connecting plate 1-33 and the second front longitudinal beam 1-11 are connected by welding. The first rear longitudinal beam 1-22 is provided with a first rear wheel housing, and the second rear longitudinal beam 1-23 is provided with a second rear wheel housing. As Figure 7 shown, the first rear wheel housing includes a first rear wheel housing connecting plate 1-35, a second rear wheel housing connecting plate 1-36 and a first rear wheel housing cover plate 1-37. The upper ends of the first rear wheel housing connecting plate 1-35 and the second rear wheel housing connecting plate 1-36 are respectively connected to the left and right ends of the first rear wheel housing cover plate 1-37. The lower ends of the first rear wheel housing connecting plate 1-35 and the second rear wheel housing connecting plate 1-36 are respectively connected to the first rear longitudinal beam 1-22. As Figure 8 shown, the second rear wheel housing includes a third rear wheel housing connecting plate 1-38, a fourth rear wheel housing connecting plate 1-39 and a second rear wheel housing cover plate 1-40. The upper ends of the third rear wheel housing connecting plate 1-38 and the fourth rear wheel housing connecting plate 1-39 are respectively connected to the left and right ends of the second rear wheel housing cover plate 1-40. The lower ends of the third rear wheel housing connecting plate 1-38 and the fourth rear wheel housing connecting plate 1-39 are respectively connected to the second rear longitudinal beam 1-23. A first rear subframe rear mounting beam 1-41 is provided below the first rear longitudinal beam 1-22, and a second rear subframe rear mounting beam 1-42 is provided below the second rear longitudinal beam 1-23. The first rear subframe rear mounting beam 1-41 and the second rear subframe rear mounting beam 1-42 are used to connect to the rear subframe frame assembly.

[0078] Preferably in this embodiment, specifically, as Figure 9 shown, the front subframe connecting device includes a first front subframe connecting member 2-1, a second front subframe connecting member 2-2, a third front subframe connecting member 2-3 and a fourth front subframe connecting member 2-4. The first front subframe connecting member 2-1 and the third front subframe connecting member 2-3 are connected to the first front longitudinal beam 1-10 by bolts, and the second front subframe connecting member 2-2 and the fourth front subframe connecting member 2-4 are connected to the second front longitudinal beam 1-11 by bolts;

[0079] Preferably in this embodiment, specifically, asFigure 9As shown, the front subframe frame assembly includes a first front subframe longitudinal beam 2-5, a second front subframe longitudinal beam 2-6, a first front subframe cross beam 2-7, a second front subframe cross beam 2-8 and a front subframe rear cross beam 2-9. One end of the first front subframe cross beam 2-7 is connected to one end of the first front subframe longitudinal beam 2-5 through a first front subframe connecting piece 2-1. A groove is provided at the other end of the first front subframe longitudinal beam 2-5. One end of the front subframe rear cross beam 2-9 is connected to the groove of the first front subframe longitudinal beam 2-5. The other end of the first front subframe cross beam 2-7 is connected to one end of the second front subframe longitudinal beam 2-6 through a second front subframe connecting piece 2-2. A groove is provided at the other end of the second front subframe longitudinal beam 2-6. The other end of the front subframe rear cross beam 2-9 is connected to the groove of the second front subframe longitudinal beam 2-6. One end of the second front subframe cross beam 2-8 is connected to the first front subframe longitudinal beam 2-5 through a third front subframe connecting piece 2-3. The other end of the second front subframe cross beam 2-8 is connected to the second front subframe longitudinal beam 2-6 through a fourth front subframe connecting piece 2-4. The second front subframe cross beam 2-8 is arranged between the first front subframe cross beam 2-7 and the front subframe rear cross beam 2-9.More preferably, the first front subframe longitudinal beam 2-5 is of a square tube structure and is provided with reinforcing ribs inside. The first front subframe longitudinal beam 2-5 is an aluminum alloy extrusion profile and is obtained by extrusion. The first front swing arm 2-10 is arranged outside the first front subframe longitudinal beam 2-5. The first front swing arm 2-10 is connected to the first front subframe longitudinal beam 2-5 through the first front subframe swing arm mounting bracket 2-12. The first front subframe swing arm mounting bracket 2-12 is connected to the first front subframe longitudinal beam 2-5 by welding. The first front swing arm 2-10 is connected to the first front subframe swing arm mounting bracket 2-12 by bolts. The first front swing arm 2-10 is an aluminum alloy extrusion profile and is obtained by extrusion. The second front subframe longitudinal beam 2-6 is of a square tube structure and is provided with reinforcing ribs inside. The second front subframe longitudinal beam 2-6 is an aluminum alloy extrusion profile and is obtained by extrusion. The second front swing arm 2-11 is arranged outside the second front subframe longitudinal beam 2-6. The second front swing arm 2-11 is connected to the second front subframe longitudinal beam 2-6 through the second front subframe swing arm mounting bracket 2-13. The second front subframe swing arm mounting bracket 2-13 is connected to the second front subframe longitudinal beam 2-6 by welding. The second front swing arm 2-11 is connected to the second front subframe swing arm mounting bracket 2-13 by bolts. The second front swing arm 2-11 is an aluminum alloy extrusion profile and is obtained by extrusion. The first front subframe connecting piece 2-1, the second front subframe connecting piece 2-2, the third front subframe connecting piece 2-3 and the fourth front subframe connecting piece 2-4 are all aluminum alloy extrusion profiles and are obtained by extrusion. The first front subframe connecting piece 2-1 is connected to the first front subframe cross beam 2-7 and the first front subframe longitudinal beam 2-5 by welding. The second front subframe connecting piece 2-2 is connected to the first front subframe cross beam 2-7 and the second front subframe longitudinal beam 2-6 by welding. The third front subframe connecting piece 2-3 is connected to the second front subframe cross beam 2-8 and the first front subframe longitudinal beam 2-5 by welding. The fourth front subframe connecting piece 2-4 is connected to the second front subframe cross beam 2-8 and the second front subframe longitudinal beam 2-6 by welding. The first front subframe cross beam 2-7, the second front subframe cross beam 2-8 and the front subframe rear cross beam 2-9 are all aluminum alloy extrusion profiles and are obtained by extrusion. The front subframe rear cross beam 2-9 is connected to the first front subframe cross beam 2-7 and the second front subframe cross beam 2-8 by welding.

[0080] As a preference of this embodiment, specifically, as Figure 10As shown in the figure, the battery tray frame assembly includes a battery pack front beam 3-1, a battery pack left beam 3-2, a battery pack rear beam 3-3, a battery pack right beam 3-4 and a battery pack middle beam assembly. The battery pack front beam 3-1, the battery pack left beam 3-2, the battery pack rear beam 3-3 and the battery pack right beam 3-4 are sequentially connected to form a battery pack frame material. The battery pack middle beam assembly includes a first battery pack middle beam 3-5 and a second battery pack middle beam 3-6. The left and right ends of the first battery pack middle beam 3-5 are respectively connected to the battery pack left beam 3-2 and the battery pack right beam 3-4. The left and right ends of the second battery pack middle beam 3-6 are respectively connected to the battery pack left beam 3-2 and the battery pack right beam 3-4. The first battery pack middle beam 3-5 and the second battery pack middle beam 3-6 are evenly arranged between the battery pack front beam 3-1 and the battery pack rear beam 3-3. More preferably, the battery pack front beam 3-1, the battery pack left beam 3-2, the battery pack rear beam 3-3 and the battery pack right beam 3-4 are all square tube structures and are provided with reinforcing ribs inside. The battery pack front beam 3-1, the battery pack left beam 3-2, the battery pack rear beam 3-3 and the battery pack right beam 3-4 are all aluminum alloy extrusion profiles and are all made by extrusion.

[0081] As a preference of this embodiment, specifically, as Figure 10 shown in the figure, the battery pack bottom plate assembly includes a first battery pack bottom plate 3-7, a second battery pack bottom plate 3-8 and a third battery pack bottom plate 3-9. The first battery pack bottom plate 3-7 is arranged between the battery pack front beam 3-1 and the first battery pack middle beam 3-5. The second battery pack bottom plate 3-8 is arranged between the first battery pack middle beam 3-5 and the second battery pack middle beam 3-6. The third battery pack bottom plate 3-9 is arranged between the second battery pack middle beam 3-6 and the battery pack rear beam 3-3. As Figure 11As shown, the battery tray connection mechanism includes a front mounting beam 3-10, a left mounting beam 3-11, a rear mounting beam 3-12 and a right mounting beam 3-13. The front mounting beam 3-10 is arranged at the front end of the front beam 3-1, the left mounting beam 3-11 is arranged at the left end of the left beam 3-2, the rear mounting beam 3-12 is arranged at the rear end of the rear beam 3-3, and the right mounting beam 3-13 is arranged at the right end of the right beam 3-4. More preferably, the front mounting beam 3-10 of the battery pack is a hollow profile and is provided with reinforcing ribs inside. The front mounting beam 3-10 of the battery pack is an aluminum alloy extruded profile, which is made by extrusion. The front mounting beam 3-10 of the battery pack is connected to the front beam 3-1 of the battery pack by welding; the left mounting beam 3-11 of the battery pack is a hollow profile and is provided with reinforcing ribs inside. The left mounting beam 3-11 of the battery pack is an aluminum alloy extruded profile, which is made by extrusion. The left mounting beam 3-11 of the battery pack is connected to the left beam 3-2 of the battery pack by welding; the rear mounting beam 3-12 of the battery pack is a hollow profile and is provided with reinforcing ribs inside. The rear mounting beam 3-12 of the battery pack is an aluminum alloy extruded profile, which is made by extrusion. The rear mounting beam 3-12 is connected to the battery pack rear beam 3-3 by welding; the battery pack right mounting beam 3-13 is a hollow profile with reinforcing ribs inside, the battery pack right mounting beam 3-13 is an aluminum alloy extruded profile made by extrusion, and the battery pack right mounting beam 3-13 is connected to the battery pack right beam 3-4 by welding; the first battery pack center beam 3-5 and the second battery pack center beam 3-6 are both square tube structures with reinforcing ribs inside, the first battery pack center beam 3-5 and the second battery pack center beam 3-6 are both aluminum alloy extruded profiles made by extrusion, the first battery pack center beam 3-5 and the second battery pack center beam 3-6 are connected to the battery pack left beam 3-2 and the battery pack left beam 3-2 by welding.

[0082] As a preferred embodiment of the present invention, specifically, the front mounting beam 3-10 of the battery pack is connected to the lower cross beam 1-12 of the front enclosure, and more specifically, the front mounting beam 3-10 of the battery pack is connected to the lower cross beam 1-12 of the front enclosure by bolts; the left mounting beam 3-11 of the battery pack is connected to the first inner threshold beam 1-15, and more specifically, the left mounting beam 3-11 of the battery pack is connected to the first inner threshold beam 1-15 by bolts; the rear mounting beam 3-12 of the battery pack is connected to the lower cross beam 1-19 of the rear enclosure, and more specifically, the rear mounting beam 3-12 of the battery pack is connected to the lower cross beam 1-19 of the rear enclosure by bolts; the right mounting beam 3-13 of the battery pack is connected to the second inner threshold beam 1-16, and more specifically, the right mounting beam 3-13 of the battery pack is connected to the second inner threshold beam 1-16 by bolts. In the present embodiment, the bolt connection method is adopted, which can make the connection between the profiles more tight and also facilitate the disassembly and assembly between the structures. In addition, the battery tray assembly 3 also includes a battery pack cover, which is arranged at the upper end of the battery tray frame assembly, and the battery pack cover can also serve as the lower body floor.

[0083] Preferably in this embodiment, specifically, as Figure 12 shown, the rear subframe frame assembly includes a first rear subframe cross member 4-1, a second rear subframe cross member 4-2, a first rear subframe longitudinal member 4-3, a second rear subframe longitudinal member 4-4, a rear subframe tie rod mounting bracket 4-5, a rear subframe tie rod 4-6, a lower control arm mounting bracket 4-7 and a lower control arm 4-8. The first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 are arranged in parallel. One end of the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 is welded to the first rear subframe longitudinal member 4-3, and one end of the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 is welded to the second rear subframe longitudinal member 4-4. Two sets of rear subframe tie rod mounting brackets 4-5 are provided on the upper surfaces of the first rear subframe longitudinal member 4-3 and the second rear subframe longitudinal member 4-4, and rear subframe tie rods 4-6 are provided on the rear subframe tie rod mounting brackets 4-5. Lower control arm mounting brackets 4-7 are provided on the lower surfaces of the first rear subframe longitudinal member 4-3 and the second rear subframe longitudinal member 4-4, and lower control arms 4-8 are provided on the lower control arm mounting brackets 4-7. More preferably, the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 are both square tube structures and are internally provided with reinforcing ribs. The first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 are both aluminum alloy extrusion profiles and are both made by extrusion; the middle parts of the first rear subframe longitudinal member 4-3 and the second rear subframe longitudinal member 4-4 are concave inward toward the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2. The first rear subframe longitudinal member 4-3 and the second rear subframe longitudinal member 4-4 are both aluminum alloy extrusion profiles and are both made by extrusion; the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 are connected to the first rear subframe longitudinal member 4-3 by welding; the first rear subframe cross member 4-1 and the second rear subframe cross member 4-2 are connected to the second rear subframe longitudinal member 4-4 by welding; the rear subframe tie rod mounting bracket 4-5 is connected to the first rear subframe cross member 4-1 or the second rear subframe cross member 4-2 by welding; the rear subframe tie rod 4-6 is connected to the rear subframe tie rod mounting bracket 4-5 by bolts; the lower control arm mounting bracket 4-7 is connected to the first rear subframe cross member 4-1 or the second rear subframe cross member 4-2 by welding; the lower control arm 4-8 is connected to the lower control arm mounting bracket 4-7 by bolts. The first rear subframe longitudinal member 4-3 is connected to the first rear subframe rear mounting beam 1-41, and the second rear subframe longitudinal member 4-4 is connected to the second rear subframe rear mounting beam 1-42. More specifically, the first rear subframe longitudinal member 4-3 is connected to the first rear subframe rear mounting beam 1-41 by welding, and the second rear subframe longitudinal member 4-4 is connected to the second rear subframe rear mounting beam 1-42 by welding.

[0084] In addition, as an optimization of this embodiment, the front anti-collision beam 1-1, the front anti-collision beam 1-1, the first energy-absorbing column 1-2, the second energy-absorbing column 1-3, the third energy-absorbing column 1-4, the fourth energy-absorbing column 1-5, the first front longitudinal beam 1-10, the second front longitudinal beam 1-11, the lower front crossbeam 1-12, the first front floor connecting beam 1-13, the second front floor connecting beam 1-14, the first inner sill beam 1-15, the second inner sill beam 1-16, the first outer sill beam 1-17, the second outer sill beam 1-18, the lower rear crossbeam 1-19, the first rear floor connecting beam 1-20, the second rear floor connecting beam 1-21, the first rear longitudinal beam 1-22, the second rear longitudinal beam 1-23, the first rear crossbeam 1-24, the second rear crossbeam 1-25, the rear anti-collision beam 1-26, the first front subframe longitudinal beam 2-5, the first front swing arm 2-10, the second front subframe longitudinal beam 2-6, the second front swing arm 2-11, the first front subframe connecting piece 2-1, the second front subframe connecting piece 2-2, the third front subframe connecting piece 2-3, the fourth front subframe connecting piece 2-4, the first front subframe crossbeam 2-7, the second front subframe crossbeam 2-8, the rear crossbeam of the front subframe 2-9, the front beam of the battery pack 3-1, the left beam of the battery pack 3-2, the rear beam of the battery pack 3-3, the right beam of the battery pack 3-4, the front mounting beam of the battery pack 3-10, the left mounting beam of the battery pack 3-11, the rear mounting beam of the battery pack 3-12, the right mounting beam of the battery pack 3-13, the first middle beam of the battery pack 3-5, the second middle beam of the battery pack 3-6, the first rear subframe crossbeam 4-1, the second rear subframe crossbeam 4-2, the first rear subframe longitudinal beam 4-3 and the second rear subframe longitudinal beam 4-4 are all made of AL-Si series alloy. More specifically, the above components are all made of 6082 aluminum alloy. The yield strength of 6082 aluminum alloy used in extrusion can reach more than 250 Mpa, which is much higher than the yield strength of ordinary castings.

[0085] In this embodiment, the concept of PTC integrated design is first applied to the design and development of an integrated extrusion aluminum alloy lower vehicle body platform with large-section and complex-shaped cavity aluminum profiles as key connecting parts. The overall structure of the chassis adopts a "well" shape, which can transmit force smoothly. When a collision occurs, the protection system transmits the impact force to the front anti-collision beam assembly and the front longitudinal beam assembly, and then transmits the force to the sill beam assemblies on both sides through the front enclosure connection mechanism. Such a structure will not squeeze the battery pack in the middle of the vehicle, thus playing a role in protecting the battery pack.

[0086] In this embodiment, all cross beams and longitudinal beams are made of high-strength multi-chamber extruded profiles, which can further improve the product performance. First of all, the multiple cavities of the longitudinal beam are composed of multiple single tubes. In mechanics, there is a saying that a pillar can hold up a thousand catties. At the same time, these single tubes are stacked together, and the mechanical properties increase geometrically. Secondly, it is the cross beam structure. The front section of the cross beam uses a large flat surface, and there are multiple inclined reinforcing ribs inside, forming multiple triangles. The triangular spatial structure is the most stable, and it can support and transmit force well, ensuring the overall stiffness and strength of the cross beam.

[0087] In addition, in this embodiment, through CAE finite element analysis, the platformized skateboard chassis of this embodiment is simulated and analyzed, and compared with well-known domestic and foreign products. The results are shown in Table 1.

[0088] Table 1 CAE analysis results and comparison of body stiffness

[0089]

[0090] It can be seen from the analysis results that the platformized skateboard chassis of this embodiment has obvious improvement in stiffness compared with the steel-aluminum hybrid lower body chassis and the all-steel lower body chassis. Compared with the integrated die-cast lower body chassis of Tesla Model Y, it has higher structural strength under the condition of comparable weight. The platformized skateboard chassis of this embodiment is more flexible in the selection of materials, and truly uses the right materials for the right body parts. In addition, although the integrated die-cast lower body chassis simplifies more than 70 welded parts of the original rear floor into 1 part, in actual application, it is still limited by disadvantages such as equipment cost, precision control, maintenance difficulty, casting defects, manufacturing limitations, and environmental impact. Moreover, when using this technology, it must be based on large-scale production, otherwise the high equipment investment and mold cost cannot be amortized. From an economic perspective, the platformized skateboard chassis of this embodiment is more cost-saving.

[0091] The ring composite beam pulsed laser welding technology for high-strength aluminum alloy multi-cavity structure profiles, which are the core components of the platform skateboard chassis in this embodiment, is based on aspects such as part materials, welding structures, and welding technologies. Starting from the direction of improving the joint performance of welded parts, it uses extruded profiles with multi-cavity complex structures to replace traditional cast aluminum alloys, innovates welding technologies, and develops the ring composite beam pulsed laser welding technology. This ring composite beam pulsed laser welding technology designs a ring composite beam, forming a larger and more stable keyhole, making it easier for metal vapor to escape; it can minimize molten metal contamination, increase the welding speed while reducing spatter by 90% or more; it can stabilize the molten pool and control cooling to overcome shrinkage stress, achieving crack-free welding without repetition. By adjusting welding process parameters and analyzing the laws of the influence of different welding process parameters on weld formation according to indicators such as the weld quality of parts and the mechanical properties after welding. To solve the problem that the complex casting process and many material defects affect the manufacturing performance of the chassis.

[0092] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A platform skateboard chassis, characterized in that: include The lower vehicle body assembly (1) comprises a front anti-collision beam assembly, a front longitudinal beam assembly, a front enclosure connection mechanism, a door sill beam assembly, a rear enclosure connection mechanism, a rear floor frame assembly and a rear anti-collision beam assembly which are connected in sequence; A front sub-frame assembly (2), comprising a front sub-frame frame assembly and a front sub-frame connecting device, wherein the front sub-frame connecting device is connected to the front sub-frame frame assembly, and the upper end of the front sub-frame connecting device is connected to the lower surface of the front longitudinal beam assembly; A battery tray assembly (3), comprising a battery tray frame assembly, a battery pack bottom plate assembly and a battery tray connection mechanism, wherein the battery pack bottom plate assembly is arranged below the battery tray frame assembly, the battery tray connection mechanism is arranged outside the battery tray frame assembly, and the battery tray connection mechanism is connected to the threshold beam assembly; The rear sub-frame assembly (4) comprises a rear sub-frame frame assembly, wherein the rear sub-frame frame assembly is connected to the rear floor frame assembly.

2. A platform skateboard chassis according to claim 1, characterized in that: The front anti-collision beam assembly comprises a front anti-collision beam (1-1), a first energy absorbing column (1-2), a second energy absorbing column (1-3), a third energy absorbing column (1-4), a fourth energy absorbing column (1-5), a first front anti-collision beam connecting assembly and a second front anti-collision beam connecting assembly. The front anti-collision beam (1-1) is a hollow profile with a middle portion bent outward. One end of the first energy absorbing column (1-2) and one end of the second energy absorbing column (1-3) are respectively connected to the left side of the front anti-collision beam (1-1). One end of the third energy absorbing column (1-4) and one end of the fourth energy absorbing column (1-5) are respectively connected to the left side of the front anti-collision beam (1-1). The first front anti-collision beam connection assembly comprises a first front anti-collision beam connection plate (1-6) and a first front longitudinal beam connection plate (1-7) which are connected to each other, the first front anti-collision beam connection plate (1-6) is connected to the other end of the first energy absorbing column (1-2) and the other end of the second energy absorbing column (1-3), the second front anti-collision beam connection assembly comprises a second front anti-collision beam connection plate (1-8) and a second front longitudinal beam connection plate (1-9) which are connected to each other, the second front anti-collision beam connection plate (1-8) is connected to the other end of the third energy absorbing column (1-4) and the other end of the fourth energy absorbing column (1-5); The front longitudinal beam assembly comprises a first front longitudinal beam (1-10) and a second front longitudinal beam (1-11), one end of the first front longitudinal beam (1-10) is connected to the first front longitudinal beam connecting plate (1-7), and one end of the second front longitudinal beam (1-11) is connected to the second front longitudinal beam connecting plate (1-9); The front enclosure connection mechanism comprises a front enclosure lower cross beam (1-12), a first front floor connection beam (1-13) and a second front floor connection beam (1-14); the first front floor connection beam (1-13) and the second front floor connection beam (1-14) are respectively arranged at the left and right ends of the front enclosure lower cross beam (1-12); the other end of the first front longitudinal beam (1-10) is connected to the first front floor connection beam (1-13); and the other end of the second front longitudinal beam (1-11) is connected to the second front floor connection beam (1-14); The threshold beam assembly comprises a first inner threshold beam (1-15), a second inner threshold beam (1-16), a first outer threshold beam (1-17) and a second outer threshold beam (1-18), one end of the first inner threshold beam (1-15) is connected to the first front floor connecting beam (1-13), the first outer threshold beam (1-17) is arranged outside the first inner threshold beam (1-15), one end of the second inner threshold beam (1-16) is connected to the second front floor connecting beam (1-14), and the second outer threshold beam (1-18) is arranged outside the second inner threshold beam (1-16); The rear enclosure connection mechanism comprises a rear enclosure lower cross beam (1-19), a first rear floor connection beam (1-20) and a second rear floor connection beam (1-21); the first rear floor connection beam (1-20) and the second rear floor connection beam (1-21) are respectively arranged at the left and right ends of the rear enclosure lower cross beam (1-19); the other end of the first inner sill beam (1-15) is connected to the first rear floor connection beam (1-20); and the other end of the second inner sill beam (1-16) is connected to the second rear floor connection beam (1-21); The rear floor frame assembly comprises a first rear longitudinal beam (1-22), a second rear longitudinal beam (1-23), a first rear cross beam (1-24) and a second rear cross beam (1-25), one end of the first rear longitudinal beam (1-22) is connected to the first rear floor connecting beam (1-20), one end of the second rear longitudinal beam (1-23) is connected to the second rear floor connecting beam (1-21), the first rear cross beam (1-24) is connected to the rear enclosure lower cross beam (1-19), and the left and right ends of the first rear cross beam (1-24) are respectively connected to the first rear floor connecting beam (1-20) and the second rear floor connecting beam (1-21), one end of the second rear cross beam (1-25) is connected to the first rear longitudinal beam (1-22), and the other end of the second rear cross beam (1-25) is connected to the second rear longitudinal beam (1-23); The rear anti-collision beam assembly comprises a rear anti-collision beam (1-26), a first rear anti-collision beam connecting component and a second rear anti-collision beam connecting component. The rear anti-collision beam (1-26) is a hollow profile with a middle portion bent outward. The first rear anti-collision beam connecting component comprises a first rear anti-collision beam connecting plate (1-27) and a first rear longitudinal beam connecting plate (1-28) connected to each other. The first rear anti-collision beam connecting plate (1-27) is connected to one side of the rear anti-collision beam (1-26). The other end of the first rear longitudinal beam (1-22) is connected to the first rear longitudinal beam connecting plate (1-28). The second rear anti-collision beam connecting component comprises a second rear anti-collision beam connecting plate (1-29) and a second rear longitudinal beam connecting plate (1-30) connected to each other. The second rear anti-collision beam connecting plate (1-29) is connected to the other side of the rear anti-collision beam (1-26). The other end of the second rear longitudinal beam (1-23) is connected to the second rear longitudinal beam connecting plate (1-30).

3. The platform skateboard chassis according to claim 2, characterized in that: The first front longitudinal beam (1-10) is provided with a first shock absorbing tower, the second front longitudinal beam (1-11) is provided with a second shock absorbing tower, the first shock absorbing tower comprises a first shock absorbing tower connecting plate (1-31) and a first shock absorbing tower cover plate (1-32) connected to each other, the first shock absorbing tower connecting plate (1-31) is connected to the first front longitudinal beam (1-10), the second shock absorbing tower comprises a second shock absorbing tower connecting plate (1-33) and a second shock absorbing tower cover plate (1-34) connected to each other, the second shock absorbing tower connecting plate (1-33) is connected to the second front longitudinal beam (1-11); The first shock tower connecting plate (1-31) and the first shock tower cover plate (1-32) are connected by welding, the first shock tower connecting plate (1-31) and the first front longitudinal beam (1-10) are connected by welding, the second shock tower connecting plate (1-33) and the second shock tower cover plate (1-34) are connected by welding, and the second shock tower connecting plate (1-33) and the second front longitudinal beam (1-11) are connected by welding; The first rear longitudinal beam (1-22) is provided with a first rear wheel cover, the second rear longitudinal beam (1-23) is provided with a second rear wheel cover, the first rear wheel cover comprises a first rear wheel cover connecting plate (1-35), a second rear wheel cover connecting plate (1-36) and a first rear wheel cover cover plate (1-37), the upper ends of the first rear wheel cover connecting plate (1-35) and the second rear wheel cover connecting plate (1-36) are respectively connected to the left and right ends of the first rear wheel cover cover plate (1-37), the first rear wheel cover connecting plate (1-35) and the second rear wheel cover connecting plate (1-36) are respectively connected to the left and right ends of the first rear wheel cover cover plate (1-37), The lower ends of the third and fourth rear wheel cover connecting plates (1-38 and 1-39) are respectively connected to the first rear longitudinal beam (1-22); the second rear wheel cover comprises a third rear wheel cover connecting plate (1-38), a fourth rear wheel cover connecting plate (1-39) and a second rear wheel cover cover plate (1-40); the upper ends of the third and fourth rear wheel cover connecting plates (1-38 and 1-39) are respectively connected to the left and right ends of the second rear wheel cover cover plate (1-40); the lower ends of the third and fourth rear wheel cover connecting plates (1-38 and 1-39) are respectively connected to the second rear longitudinal beam (1-23); A first rear sub-frame rear mounting beam (1-41) is provided below the first rear longitudinal beam (1-22), a second rear sub-frame rear mounting beam (1-42) is provided below the second rear longitudinal beam (1-23), and the first rear sub-frame rear mounting beam (1-41) and the second rear sub-frame rear mounting beam (1-42) are used to be connected to the rear sub-frame frame assembly.

4. The platform skateboard chassis according to claim 3, characterized in that: The front anti-collision beam (1-1) is provided with reinforcing ribs inside, and the front anti-collision beam (1-1) is an aluminum alloy extruded profile, which is manufactured by extrusion; The first energy absorbing column (1-2), the second energy absorbing column (1-3), the third energy absorbing column (1-4) and the fourth energy absorbing column (1-5) are all square tube structures and are provided with reinforcing ribs inside; the first energy absorbing column (1-2), the second energy absorbing column (1-3), the third energy absorbing column (1-4) and the fourth energy absorbing column (1-5) are all aluminum alloy extruded profiles and are all made by extrusion; the first energy absorbing column (1-2), the second energy absorbing column (1-3), the third energy absorbing column (1-4) and the fourth energy absorbing column (1-5) are welded to the front anti-collision beam (1-1); the first energy absorbing column (1-2) and the second energy absorbing column (1-3) are connected to the first front anti-collision beam connecting plate (1-6) by welding; and the third energy absorbing column (1-4) and the fourth energy absorbing column (1-5) are connected to the second front anti-collision beam connecting plate (1-8) by welding; The first front anti-collision beam connecting plate (1-6) is connected to the first front longitudinal beam connecting plate (1-7) by bolts, and the second front anti-collision beam connecting plate (1-8) is connected to the second front longitudinal beam connecting plate (1-9) by bolts; The first front longitudinal beam (1-10) and the second front longitudinal beam (1-11) are both square tube structures and are provided with reinforcing ribs inside. The first front longitudinal beam (1-10) and the second front longitudinal beam (1-11) are both aluminum alloy extruded profiles and are both made by extrusion. The first front longitudinal beam (1-10) is connected to the first front longitudinal beam connecting plate (1-7) and the first front floor connecting beam (1-13) by welding, and the second front longitudinal beam (1-11) is connected to the second front longitudinal beam connecting plate (1-9) and the second front floor connecting beam (1-14) by welding. The front enclosure lower cross beam (1-12), the first front floor connecting beam (1-13) and the second front floor connecting beam (1-14) are all hollow profiles and are provided with reinforcing ribs inside; the front enclosure lower cross beam (1-12), the first front floor connecting beam (1-13) and the second front floor connecting beam (1-14) are all aluminum alloy extruded profiles and are all made by extrusion; the first front floor connecting beam (1-13) and the second front floor connecting beam (1-14) are connected to the front enclosure lower cross beam (1-12) by welding; The first inner sill beam (1-15), the second inner sill beam (1-16), the first outer sill beam (1-17) and the second outer sill beam (1-18) are all square tube structures and are provided with reinforcing ribs inside. The first inner sill beam (1-15), the second inner sill beam (1-16), the first outer sill beam (1-17) and the second outer sill beam (1-18) are all aluminum alloy extruded profiles and are all made by extrusion. The first inner sill beam (1-15) is connected to the first front floor connecting beam (1-13) and the first rear floor connecting beam (1-20) by welding. The first outer sill beam (1-17) is connected to the first inner sill beam (1-15) by welding. The second inner sill beam (1-16) is connected to the second front floor connecting beam (1-14) and the second rear floor connecting beam (1-21) by welding. The second outer sill beam (1-18) is connected to the second inner sill beam (1-16) by welding. The rear enclosure lower cross beam (1-19), the first rear floor connecting beam (1-20) and the second rear floor connecting beam (1-21) are all square tubes and are provided with reinforcing ribs inside; the rear enclosure lower cross beam (1-19), the first rear floor connecting beam (1-20) and the second rear floor connecting beam (1-21) are all aluminum alloy extruded profiles and are all made by extrusion; the first rear floor connecting beam (1-20) and the second rear floor connecting beam (1-21) are connected to the rear enclosure lower cross beam (1-19) by welding; The first rear longitudinal beam (1-22), the second rear longitudinal beam (1-23), the first rear cross beam (1-24) and the second rear cross beam (1-25) are all square tubes and are provided with reinforcing ribs inside; the first rear longitudinal beam (1-22), the second rear longitudinal beam (1-23), the first rear cross beam (1-24) and the second rear cross beam (1-25) are all aluminum alloy extruded profiles and are all made by extrusion; the first rear longitudinal beam (1-22), the second rear longitudinal beam (1-23), the first rear cross beam (1-24) and the second rear cross beam (1-25) are all connected by welding; The rear anti-collision beam (1-26) is provided with reinforcing ribs inside, and the rear anti-collision beam (1-26) is an aluminum alloy extruded profile, which is manufactured by extrusion; The first rear anti-collision beam connecting plate (1-27) is connected to the first rear longitudinal beam connecting plate (1-28) by bolts, the first rear anti-collision beam connecting plate (1-27) is connected to the rear anti-collision beam (1-26) by welding, the first rear longitudinal beam connecting plate (1-28) is connected to the first rear longitudinal beam (1-22) by welding, the second rear anti-collision beam connecting plate (1-29) is connected to the second rear longitudinal beam connecting plate (1-30) by bolts, the second rear anti-collision beam connecting plate (1-29) is connected to the rear anti-collision beam (1-26) by welding, and the second rear longitudinal beam connecting plate (1-30) is connected to the second rear longitudinal beam (1-23) by welding.

5. The platform skateboard chassis according to claim 2, characterized in that: The front sub-frame connecting device comprises a first front sub-frame connecting member (2-1), a second front sub-frame connecting member (2-2), a third front sub-frame connecting member (2-3) and a fourth front sub-frame connecting member (2-4); the first front sub-frame connecting member (2-1) and the third front sub-frame connecting member (2-3) are connected to the first front longitudinal beam (1-10) by bolts, and the second front sub-frame connecting member (2-2) and the fourth front sub-frame connecting member (2-4) are connected to the second front longitudinal beam (1-11) by bolts; The front sub-frame frame assembly comprises a first front sub-frame longitudinal beam (2-5), a second front sub-frame longitudinal beam (2-6), a first front sub-frame cross beam (2-7), a second front sub-frame cross beam (2-8) and a front sub-frame rear cross beam (2-9); one end of the first front sub-frame cross beam (2-7) is connected to one end of the first front sub-frame longitudinal beam (2-5) through the first front sub-frame connecting member (2-1); the other end of the first front sub-frame longitudinal beam (2-5) is provided with a groove; one end of the front sub-frame rear cross beam (2-9) is connected to the groove of the first front sub-frame longitudinal beam (2-5); the other end of the first front sub-frame cross beam (2-7) is connected to one end of the second front sub-frame longitudinal beam (2-6) through the first front sub-frame connecting member (2-1); The first front sub-frame longitudinal beam (2-5) and the second front sub-frame longitudinal beam (2-6) are connected by two front sub-frame connecting members (2-2); the other end of the second front sub-frame longitudinal beam (2-6) is provided with a groove; the other end of the front sub-frame rear cross beam (2-9) is connected to the groove of the second front sub-frame longitudinal beam (2-6); one end of the second front sub-frame cross beam (2-8) is connected to the first front sub-frame longitudinal beam (2-5) through the third front sub-frame connecting member (2-3); the other end of the second front sub-frame cross beam (2-8) is connected to the second front sub-frame longitudinal beam (2-6) through the fourth front sub-frame connecting member (2-4); and the second front sub-frame cross beam (2-8) is arranged between the first front sub-frame cross beam (2-7) and the front sub-frame rear cross beam (2-9).

6. The platform skateboard chassis according to claim 5, characterized in that: The first front sub-frame longitudinal beam (2-5) is a square tube structure and is provided with reinforcing ribs inside. The first front sub-frame longitudinal beam (2-5) is an aluminum alloy extruded profile and is manufactured by extrusion. A first front swing arm (2-10) is provided on the outer side of the first front sub-frame longitudinal beam (2-5). The first front swing arm (2-10) is connected to the first front sub-frame longitudinal beam (2-5) via a first front sub-frame swing arm mounting bracket (2-12). The first front sub-frame swing arm mounting bracket (2-12) is connected to the first front sub-frame longitudinal beam (2-5) by welding. The first front swing arm (2-10) is connected to the first front sub-frame swing arm mounting bracket (2-12) by bolts. The first front swing arm (2-10) is an aluminum alloy extruded profile and is manufactured by extrusion. The second front sub-frame longitudinal beam (2-6) is a square tube structure and is provided with reinforcing ribs inside; the second front sub-frame longitudinal beam (2-6) is an aluminum alloy extruded profile and is manufactured by extrusion; a second front swing arm (2-11) is provided on the outer side of the second front sub-frame longitudinal beam (2-6); the second front swing arm (2-11) is connected to the second front sub-frame longitudinal beam (2-6) via a second front sub-frame swing arm mounting bracket (2-13); the second front sub-frame swing arm mounting bracket (2-13) is connected to the second front sub-frame longitudinal beam (2-6) by welding; the second front swing arm (2-11) is connected to the second front sub-frame swing arm mounting bracket (2-13) by bolts; the second front swing arm (2-11) is an aluminum alloy extruded profile and is manufactured by extrusion; The first front sub-frame connecting member (2-1), the second front sub-frame connecting member (2-2), the third front sub-frame connecting member (2-3) and the fourth front sub-frame connecting member (2-4) are all aluminum alloy extruded profiles, and are obtained by extrusion; the first front sub-frame connecting member (2-1) is connected to the first front sub-frame cross beam (2-7) and the first front sub-frame longitudinal beam (2-5) by welding; the second front sub-frame connecting member (2-2) is connected to the first front sub-frame cross beam (2-7) and the second front sub-frame longitudinal beam (2-6) by welding; the third front sub-frame connecting member (2-3) is connected to the second front sub-frame cross beam (2-8) and the first front sub-frame longitudinal beam (2-5) by welding; and the fourth front sub-frame connecting member (2-4) is connected to the second front sub-frame cross beam (2-8) and the second front sub-frame longitudinal beam (2-6) by welding; The first front subframe crossbeam (2-7), the second front subframe crossbeam (2-8) and the front subframe rear crossbeam (2-9) are all aluminum alloy extruded profiles, which are manufactured by extrusion; the front subframe rear crossbeam (2-9) is connected to the first front subframe crossbeam (2-7) and the second front subframe crossbeam (2-8) by welding.

7. The platform skateboard chassis according to claim 1, characterized in that: The battery tray frame assembly comprises a battery pack front beam (3-1), a battery pack left beam (3-2), a battery pack rear beam (3-3), a battery pack right beam (3-4) and a battery pack middle beam assembly. The battery pack front beam (3-1), the battery pack left beam (3-2), the battery pack rear beam (3-3) and the battery pack right beam (3-4) are sequentially connected to form a battery pack frame material. The battery pack middle beam assembly comprises a first battery pack middle beam (3-5) and a second battery pack middle beam (3-6). The left and right ends of the first battery pack middle beam (3-5) are respectively connected to the battery pack left beam (3-2) and the battery pack right beam (3-4). The left and right ends of the second battery pack middle beam (3-6) are respectively connected to the battery pack left beam (3-2) and the battery pack right beam (3-4). The first battery pack middle beam (3-5) and the second battery pack middle beam (3-6) are evenly arranged between the battery pack front beam (3-1) and the battery pack rear beam (3-3). The battery pack floor assembly comprises a first battery pack floor (3-7), a second battery pack floor (3-8) and a third battery pack floor (3-9), wherein the first battery pack floor (3-7) is arranged between the battery pack front beam (3-1) and the first battery pack middle beam (3-5), the second battery pack floor (3-8) is arranged between the first battery pack middle beam (3-5) and the second battery pack middle beam (3-6), and the third battery pack floor (3-9) is arranged between the second battery pack middle beam (3-6) and the battery pack rear beam (3-3); The battery tray connection mechanism comprises a front mounting beam (3-10) of the battery pack, a left mounting beam (3-11) of the battery pack, a rear mounting beam (3-12) of the battery pack and a right mounting beam (3-13) of the battery pack. The front mounting beam (3-10) of the battery pack is arranged at the front end of the front beam (3-1) of the battery pack, the left mounting beam (3-11) of the battery pack is arranged at the left end of the left beam (3-2) of the battery pack, the rear mounting beam (3-12) of the battery pack is arranged at the rear end of the rear beam (3-3) of the battery pack, and the right mounting beam (3-13) of the battery pack is arranged at the right end of the right beam (3-4) of the battery pack.

8. The platform skateboard chassis according to claim 7, characterized in that: The battery pack front beam (3-1), the battery pack left beam (3-2), the battery pack rear beam (3-3) and the battery pack right beam (3-4) are all square tube structures and are provided with reinforcing ribs inside. The battery pack front beam (3-1), the battery pack left beam (3-2), the battery pack rear beam (3-3) and the battery pack right beam (3-4) are all aluminum alloy extruded profiles and are all made by extrusion; The battery pack front mounting beam (3-10) is a hollow profile and is provided with reinforcing ribs inside. The battery pack front mounting beam (3-10) is an aluminum alloy extruded profile and is manufactured by extrusion. The battery pack front mounting beam (3-10) is connected to the battery pack front beam (3-1) by welding. The battery pack left mounting beam (3-11) is a hollow profile and is provided with reinforcing ribs inside. The battery pack left mounting beam (3-11) is an aluminum alloy extruded profile and is made by extrusion. The battery pack left mounting beam (3-11) is connected to the battery pack left beam (3-2) by welding. The battery pack rear mounting beam (3-12) is a hollow profile and is provided with reinforcing ribs inside. The battery pack rear mounting beam (3-12) is an aluminum alloy extruded profile and is made by extrusion. The battery pack rear mounting beam (3-12) is connected to the battery pack rear beam (3-3) by welding. The battery pack right mounting beam (3-13) is a hollow profile and is provided with reinforcing ribs inside. The battery pack right mounting beam (3-13) is an aluminum alloy extruded profile and is made by extrusion. The battery pack right mounting beam (3-13) is connected to the battery pack right beam (3-4) by welding. The first battery pack center beam (3-5) and the second battery pack center beam (3-6) are both square tube structures and are provided with reinforcing ribs inside. The first battery pack center beam (3-5) and the second battery pack center beam (3-6) are both aluminum alloy extruded profiles and are both made by extrusion. The first battery pack center beam (3-5) and the second battery pack center beam (3-6) are connected to the battery pack left beam (3-2) and the battery pack left beam (3-2) by welding.

9. The platform skateboard chassis according to claim 1, characterized in that: The rear sub-frame frame assembly comprises a first rear sub-frame cross beam (4-1), a second rear sub-frame cross beam (4-2), a first rear sub-frame longitudinal beam (4-3), a second rear sub-frame longitudinal beam (4-4), a rear sub-frame tie rod mounting bracket (4-5), a rear sub-frame tie rod (4-6), a lower swing arm mounting bracket (4-7) and a lower swing arm (4-8); the first rear sub-frame cross beam (4-1) and the second rear sub-frame cross beam (4-2) are arranged in parallel; one end of each of the first rear sub-frame cross beam (4-1) and the second rear sub-frame cross beam (4-2) are welded to the first rear sub-frame longitudinal beam (4-3); the first rear sub-frame One end of the cross beam (4-1) and the second rear sub-frame cross beam (4-2) are welded to the second rear sub-frame longitudinal beam (4-4); the upper surfaces of the first rear sub-frame longitudinal beam (4-3) and the second rear sub-frame longitudinal beam (4-4) are provided with two groups of rear sub-frame tie rod mounting brackets (4-5); the rear sub-frame tie rod (4-6) is provided on the rear sub-frame tie rod mounting brackets (4-5); the lower surfaces of the first rear sub-frame longitudinal beam (4-3) and the second rear sub-frame longitudinal beam (4-4) are provided with lower swing arm mounting brackets (4-7); the lower swing arm (4-8) is provided on the lower swing arm mounting brackets (4-7).

10. The platform skateboard chassis according to claim 9, characterized in that: The first rear subframe cross beam (4-1) and the second rear subframe cross beam (4-2) are both square tube structures and are provided with reinforcing ribs inside; the first rear subframe cross beam (4-1) and the second rear subframe cross beam (4-2) are both aluminum alloy extruded profiles and are manufactured by extrusion; The middle parts of the first rear sub-frame longitudinal beam (4-3) and the second rear sub-frame longitudinal beam (4-4) are both concave toward one side of the first rear sub-frame cross beam (4-1) and the second rear sub-frame cross beam (4-2); the first rear sub-frame longitudinal beam (4-3) and the second rear sub-frame longitudinal beam (4-4) are both aluminum alloy extruded profiles and are both manufactured by extrusion; The first rear subframe cross beam (4-1) and the second rear subframe cross beam (4-2) are connected to the first rear subframe longitudinal beam (4-3) by welding; The first rear subframe cross beam (4-1) and the second rear subframe cross beam (4-2) are connected to the second rear subframe longitudinal beam (4-4) by welding; The rear sub-frame tie rod mounting bracket (4-5) is connected to the first rear sub-frame cross beam (4-1) or the second rear sub-frame cross beam (4-2) by welding; The rear sub-frame tie rod (4-6) is connected to the rear sub-frame tie rod mounting bracket (4-5) via bolts; The lower swing arm mounting bracket (4-7) is connected to the first rear sub-frame cross beam (4-1) or the second rear sub-frame cross beam (4-2) by welding; The lower swing arm (4-8) is connected to the lower swing arm mounting bracket (4-7) via bolts.

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