A heavy truck electric vehicle and a battery box connecting structure thereof

Abstract

The utility model discloses a heavy truck electric vehicle and battery box connecting structure thereof, belong to heavy truck electric vehicle technical field. The battery box connecting structure includes: the first connecting seat fixed on the vehicle frame longitudinal beam, first connecting seat has along the horizontal direction extension's first connecting hole and along the vertical direction extension's first locating hole, the second connecting seat fixed on the battery box support longitudinal beam, second connecting seat has along the horizontal direction extension's second connecting hole and along the vertical direction extension and with first locating hole matching's first locating shaft, pin shaft, one end of pin shaft is connected on first connecting seat's first connecting hole and second connecting hole of second connecting seat, the other end is connected on the battery box support longitudinal beam of the vehicle frame side away from. The utility model can realize the quick, reliable replacement of battery box assembly and fix.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty electric trucks, and in particular to a battery box connection structure for heavy-duty electric trucks. Background Technology

[0002] With continuous breakthroughs in new energy vehicle technologies and the strict implementation of national policies on ecological environmental protection and energy conservation and emission reduction, full electrification has become a core trend in the development of the automotive industry. Against this backdrop, the heavy-duty truck market, as a crucial component of the commercial vehicle sector, is accelerating its new energy transformation. However, the electrification process in the heavy-duty truck sector is constrained by battery technology bottlenecks, particularly in terms of significant limitations in range. Due to the large load capacity and frequent long-distance transport or high-intensity operations of heavy-duty trucks, battery energy is consumed rapidly, and the long charging and swapping times directly impact their operational efficiency. Therefore, achieving rapid charging and swapping of heavy-duty truck batteries is a key technological path to solving the problem of insufficient range and improving the utilization rate of heavy-duty trucks.

[0003] In existing technologies, to balance reliability, convenience, and economy in charging and swapping, the industry generally uses mechanical structures to complete the installation and replacement of battery boxes and vehicle frames. During this process, the performance of the connection structure between the battery box and the vehicle frame directly determines the charging and swapping efficiency and operational safety. The core technical challenge of this connection structure lies in how to achieve rapid and reliable fixing and unfixing of the battery box. While current mechanical connection structures can meet basic usage requirements, they still have shortcomings in practical applications: some structures have cumbersome fixing processes, resulting in excessively long battery swapping times and making them unsuitable for the high-efficiency operation requirements of heavy-duty trucks; some structures, while pursuing rapid connection, lack sufficient fixing strength and are prone to loosening under the bumps and impacts of heavy-duty truck operation, posing safety hazards; and some structures have poor versatility, making it difficult to adapt to different battery box specifications, increasing the R&D and maintenance costs for vehicle manufacturers. Therefore, developing a heavy-duty truck battery box and vehicle frame connection structure that combines rapid operation, reliable fixing, and good versatility has become an urgent need to promote the large-scale application of new energy heavy-duty trucks. Utility Model Content

[0004] Therefore, this utility model proposes a heavy-duty electric truck and its battery box connection structure to achieve quick and reliable replacement and fixing of the battery box assembly.

[0005] To address the aforementioned technical problems, this utility model provides the following technical solution: A battery box connection structure for a heavy-duty electric truck includes: a first connecting seat fixed to a longitudinal beam of the vehicle frame, the first connecting seat having a first connecting hole extending in a horizontal direction and a first positioning hole extending in a vertical direction; a second connecting seat fixed to a battery box support longitudinal beam, the second connecting seat having a second connecting hole extending in a horizontal direction and a first positioning shaft extending in a vertical direction and matching the first positioning hole; and a pin, one end of which is connected to the first connecting hole of the first connecting seat and the second connecting hole of the second connecting seat, and the other end is connected to the battery box support longitudinal beam away from the side of the vehicle frame.

[0006] In some embodiments of this utility model, the upper region of the first connecting seat is provided with a first connecting area that matches the outer surface of the frame longitudinal beam, and the first connecting area is connected to the frame longitudinal beam by a fastening assembly; the middle region of the first connecting seat is provided with a positioning plate extending in a horizontal direction, and the positioning plate is provided with the first positioning hole; the lower region of the first connecting seat is provided with two parallel and spaced-apart lugs, and the two lugs are provided with the first connecting hole coaxially arranged.

[0007] In some embodiments of this utility model, the second connecting seat includes a connecting seat body disposed in the central region and at least one set of second connecting portions disposed on the outer periphery of the connecting seat body. The second connecting hole is opened on the side of the connecting seat body, the first positioning shaft is connected to the upper surface of the connecting seat body, and the second connecting portion is connected to the battery box support longitudinal beam through a fastening assembly.

[0008] In some embodiments of this utility model, the connecting body of the second connecting seat is located inside the two lugs of the first connecting seat, and a first buffer pad is provided between the upper surface of the connecting body and the positioning plate of the first connecting seat.

[0009] In some embodiments of this utility model, the second connecting seat further includes a buffer assembly disposed in the second connecting hole. The buffer assembly includes a connecting sleeve and a first rubber ring. The connecting sleeve is adapted to cooperate with the pin. The first rubber ring is located between the connecting sleeve and the inner wall of the second connecting hole of the second connecting seat. The area where the pin cooperates with the connecting sleeve is provided with a second rubber ring.

[0010] In some embodiments of this utility model, the second connecting hole is constructed as a stepped hole, the connecting sleeve is constructed as a T-shaped sleeve, one end face of the first rubber ring abuts against the stepped surface of the second connecting hole, and the other end face abuts against the stepped surface of the connecting sleeve, and there is a gap between the outer peripheral surface of the large diameter region of the connecting sleeve and the second connecting hole of the second connecting seat.

[0011] In some embodiments of this utility model, the first connecting hole of the first connecting seat near the longitudinal beam of the frame is a smooth hole, and the first connecting hole of the first connecting seat away from the longitudinal beam of the frame is a threaded hole. The end region of the pin is constructed as a tapered conical shaft and mates with the first connecting hole near the longitudinal beam of the frame. The portion of the pin that mates with the first connecting hole away from the longitudinal beam of the frame has external threads. The pin is threadedly connected to the first connecting seat and locked by a nut sleeved on the pin.

[0012] In some embodiments of this utility model, a third connecting hole extending horizontally is provided on the battery box support longitudinal beam away from the vehicle frame side, and the pin is rotatably inserted into the third connecting hole; a plug is provided at the end of the pin away from the vehicle frame longitudinal beam, and the end of the plug is provided with a plug interface suitable for inserting a connecting wrench.

[0013] In some embodiments of this utility model, a rotating positioning pin is also provided on the battery box support longitudinal beam away from the vehicle frame side. The rotating positioning pin has a first working position and a second working position. When the rotating positioning pin is in the first working position, the end of the rotating positioning pin abuts against the side of the pin shaft to lock the position of the pin shaft. When the rotating positioning pin is in the second working position, the end of the rotating positioning pin disengages from the side of the pin shaft to unlock the position of the pin shaft.

[0014] This utility model also provides a heavy-duty electric truck, including: a frame, the frame including frame longitudinal beams and frame cross beams; a battery box assembly, the battery box assembly including battery box support longitudinal beams, battery box support cross beams and battery packs; and the battery box connection structure.

[0015] The technical solution of this utility model has the following technical advantages over the prior art: The heavy-duty electric truck and its battery box connection structure provided by this utility model achieves a quick and detachable connection through the cooperation of a first connecting seat on the longitudinal beam of the frame and a second connecting seat on the battery support frame. The first positioning hole of the first connecting seat and the first positioning shaft on the second connecting seat cooperate to achieve pre-positioning between them. One end of the pin connects to the first and second connecting seats, and the other end connects to the battery box support frame. This allows the battery box to function as a complete module, enabling quick and safe disassembly and installation when battery replacement or maintenance is required. This significantly shortens the assembly and disassembly time of the battery box and enables rapid battery replacement. Attached Figure Description

[0016] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of this utility model, wherein: Figure 1This is a schematic diagram of one embodiment of the battery box connection structure of the heavy-duty electric truck of this utility model; Figure 2 This is a schematic diagram of the connection structure between the frame and the first connecting seat of the heavy-duty electric truck of this utility model; Figure 3 This is a schematic diagram of the connection structure between the battery support frame and the second connecting seat of the heavy-duty electric truck of this utility model; Figure 4 This is a schematic diagram of one embodiment of the first connecting seat of this utility model; Figure 5 This is a schematic diagram of one embodiment of the second connecting seat of this utility model; Figure 6 This is a schematic diagram of the connection structure of the first connecting seat, the second connecting seat, and the pin of this utility model. Figure 7 This is a schematic diagram of the pin shaft and the battery support longitudinal beam on the side away from the vehicle frame in this utility model. Figure 8 for Figure 1 Enlarged view of section A in the middle. Detailed Implementation

[0017] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] The battery box connection structure for heavy-duty electric trucks provided by this utility model is used to achieve quick and accurate docking and locking between the battery box assembly and the vehicle frame, meeting the dual requirements of convenient battery replacement and operational reliability for commercial electric vehicles.

[0022] like Figure 1-3 The diagram shows a battery box connection structure according to one embodiment of the present invention, mainly including a first connecting seat 100, a second connecting seat 200, and a pin 300. The first connecting seat 100 is pre-fixed to a predetermined position on the inner or outer side of the frame longitudinal beam 10 using fastening components (such as bolts and nuts). The first connecting seat 100 has a first connecting hole 120 extending horizontally for the pin 300 to pass through, and a first positioning hole 110 extending vertically. The second connecting seat 200 is pre-fixed to the corresponding end of the battery box support longitudinal beam 20 (i.e., the first support longitudinal beam 20a) near the frame longitudinal beam 10 using fastening components. The second connecting seat 200 has a second connecting hole 220 coaxial with the first connecting hole 120, and a first positioning shaft 210 is integrally formed or fixedly connected at the position corresponding to the first positioning hole 110.

[0023] When the battery pack assembly needs to be installed (e.g., when the battery pack assembly is first installed on the frame), the lifting device is used to move the frame to a predetermined position above the battery pack assembly. First, the frame is moved downwards so that the first positioning shaft 210 on the second connecting seat 200 is inserted into the first positioning hole 110 on the first connecting seat 100, completing the initial positioning and support of the battery pack support longitudinal beam 20 in the vertical plane. Subsequently, the pin 300 is passed horizontally through the first connecting hole 120 on the first connecting seat 100 and the second connecting hole 220 on the second connecting seat 200, finally connecting its end with the third connecting hole 21 on the battery pack support longitudinal beam 20 (i.e., the second support longitudinal beam 20b) away from the frame side. At this point, the battery pack assembly achieves reliable connection and constraint with the frame in both the vertical direction (through the positioning shaft and hole) and the horizontal direction (through the pin 300) through this connection structure. The aforementioned battery box connection structure, through the pre-positioning cooperation between the first positioning shaft 210 and the first positioning hole 110, can quickly align the connection position during battery box or vehicle frame hoisting, shortening assembly time; the horizontal insertion of the pin shaft enables quick locking and unlocking of the connection, providing operational convenience for battery box replacement, while the multi-point support structure ensures the reliability of the connection.

[0024] Specifically, in one alternative implementation, such as Figure 4As shown, the first connecting seat 100 is preferably an integrally formed casting or forging. Its upper region is machined or constructed to match the outer contour of the frame longitudinal beam 10. The first connecting region 130 has four connecting holes 131. The first connecting region 130 is fitted and connected using high-strength bolts, ensuring effective force transmission and stable connection between the first connecting seat 100 and the frame longitudinal beam 10. A positioning plate 140 extends horizontally outward from the middle region towards the frame longitudinal beam 10. This positioning plate 140 has the first positioning hole 110, which is a smooth hole used to precisely guide and receive the first positioning shaft 210 on the second connecting seat 200, achieving initial positioning. The lower region has two parallel, spaced-apart lugs 150, each with a coaxially machined first connecting hole 120, providing two horizontal support points for the pin 300. The aforementioned first connection area 130 improves the fit with the frame longitudinal beam and disperses the connection stress; the positioning plate 140 provides a stable support base for the first positioning hole and improves the positioning accuracy; the double-ear structure provides lateral restraint for the second connection seat 200 and enhances the torsional resistance of the overall connection.

[0025] Specifically, in one alternative implementation, such as Figure 5 As shown, the second connecting seat 200 is also made of high-strength material. The second connecting seat 200 includes a connecting seat body 201 and three sets of second connecting portions 202 disposed on the outer periphery of the connecting seat body 201. The connecting seat body 201 has a second connecting hole 220 on its side, and the first positioning shaft 210 is vertically connected (e.g., welded or bolted) to its upper surface. The second connecting portion 202 has a bolt connecting hole 230 suitable for the bolt fastening assembly to pass through. The second connecting seat 200 and the battery box support longitudinal beam 20 can be directly connected by the bolt fastening assembly passing through the second connecting portion 202 or fastened by a transition connector, thereby effectively distributing the load of the second connecting seat 200 to the battery box support longitudinal beam 20. During installation, the connector body 201 is located between the two lugs 150 of the first connector 100. The first positioning shaft 210 at its top is inserted into the first positioning hole 110 above, while the second connecting hole 220 on its side is aligned with the first connecting hole 120 on the two lugs 150, ready to receive the pin 300.

[0026] Specifically, in one optional embodiment, the first connecting hole 120 on the lug (first lug 150a) near the longitudinal beam 10 of the frame is a smooth hole, while the first connecting hole 120 on the lug (second lug 150b) away from the longitudinal beam 10 of the frame is a threaded hole. One end of the pin 300 is machined into a tapered shaft end 310, which is first inserted into the first connecting hole 120 on the first lug. The self-centering effect of the tapered surface facilitates initial alignment and improves centering accuracy. The main body of the pin 300 is machined with external threads, and after passing through the buffer assembly of the second connecting seat 200, it is screwed into the first connecting hole 120 (threaded hole) of the second lug 150b. Finally, a nut 320 is fitted onto the pin 300 and tightened. The nut 320 is then locked to the side of the second lug 150b, thereby firmly pulling the pin 300, the second connecting seat 200, and the first connecting seat 100 together as a whole, eliminating the fit gap and achieving high connection rigidity and anti-loosening guarantee.

[0027] To cope with the complex loads and impacts experienced by heavy trucks during operation, the battery pack connection structure incorporates a buffer design at key connection interfaces. Specifically, in one optional implementation, such as... Figure 6 As shown, a first buffer pad 500 (such as a rubber pad) is provided between the upper surface of the connector body 201 of the second connector 200 and the lower surface of the positioning plate 140 of the first connector 100. The first buffer pad 500 can effectively buffer and absorb part of the vertical impact load and vibration between the battery pack assembly and the vehicle frame when the vehicle is bumpy, protect the connecting parts and reduce the impact transmitted to the battery pack.

[0028] In one optional embodiment, a buffer assembly is provided within the second connecting hole 220. This buffer assembly includes a connecting sleeve 230 (e.g., a steel sleeve) and a first rubber ring 240. The inner hole of the connecting sleeve 230 has a clearance or transition fit with the pin 300, and its outer periphery is elastically connected to the inner wall of the second connecting hole 220 through the first rubber ring 240. Furthermore, a second rubber ring 340 is also fitted in the section where the pin 300 mates with the connecting sleeve 230. This double rubber ring buffer design allows the pin 300 to absorb energy through the shear and compression deformation of the first and second rubber rings 240 when subjected to radial forces from the battery box (such as turning centrifugal force or lateral wind load), significantly reducing rigid impact and noise, and improving the fatigue life of the connection.

[0029] To optimize the assembly and stress distribution of the buffer assembly, in one optional embodiment, the second connecting hole 220 is constructed as a stepped hole, and the connecting sleeve 230 is correspondingly constructed as a T-shaped sleeve. One end face of the first rubber ring 240 abuts against the stepped surface inside the second connecting hole 220, while the other end face abuts against the stepped surface of the connecting sleeve 230. This structure ensures that the first rubber ring 240 is reliably pre-tightened and limited in the axial direction, preventing it from shifting during use. Simultaneously, a gap is maintained between the outer circumferential surface of the large-diameter region (i.e., the head of the T-shape) of the connecting sleeve 230 and the inner wall of the large-diameter section of the second connecting hole 220. This provides space for the radial deformation of the rubber ring, ensuring the buffering effect and preventing direct contact and friction between the connecting sleeve 230 and the second connecting seat 200.

[0030] In one alternative implementation, such as Figure 3 As shown, a third connecting hole 21 is provided on the battery box support longitudinal beam 20 (second support longitudinal beam 20b) on the side away from the vehicle frame. The end extension of the pin 300 is rotatably inserted into this third connecting hole 21. "Rotatably inserted" here means that the pin 300 can be rotated relative to the battery box support longitudinal beam 20 by means of, for example, a sliding bearing or by leaving an appropriate clearance, so that the rotation of the pin 300 can be controlled by manipulating the end of the support longitudinal beam 20 located away from the vehicle frame to achieve the connection and fixation of the pin 300 with the first connecting seat 100 and the second connecting seat 200.

[0031] Furthermore, to facilitate the installation and removal of the pin 300, in one optional implementation, such as... Figure 7 , Figure 8 As shown, a plug 330 is provided at the end of the vehicle frame longitudinal beam 10 away from the end of the plug 330. The end of the plug 330 is provided with a plug interface 331 (such as an internal hexagonal socket, Torx hole, etc.), which allows the operator to use the corresponding wrench tool to perform the tightening operation, which is labor-saving and efficient.

[0032] To prevent the pin 300 from accidentally rotating and loosening due to vibration during long-term vehicle operation, a rotational locating pin 400 is installed on the battery box support longitudinal beam 20 on the side away from the frame. This rotational locating pin 400 has two working positions: when in the first working position (locked position), its end extends under the action of a spring or thread and tightly abuts against the side plane of the pin 300 or a specially machined groove, thus mechanically preventing the pin 300 from rotating and providing a secondary anti-loosening function. When it is necessary to disassemble the battery box, the rotational locating pin 400 is operated to the second working position (unlocked position), its end retracts, disengaging from the side of the pin 300, thereby releasing the rotation restriction on the pin 300 for subsequent disassembly operations. This design greatly enhances the safety of the connection.

[0033] This utility model also provides a heavy-duty electric truck employing the aforementioned battery box connection structure, comprising a frame composed of frame longitudinal beams 10 and frame crossbeams, and a battery box assembly composed of battery box support longitudinal beams 20, battery box support crossbeams, and a battery pack. By arranging at least one set (usually multiple sets along the longitudinal beam extension direction) of the aforementioned battery box connection structure at the end of the battery box support longitudinal beam 20 and on the corresponding frame longitudinal beam 10, a quick and reliable connection between the battery box assembly and the frame is achieved. This allows the battery box to function as a complete module, enabling quick and safe disassembly and installation when battery swapping or maintenance is required.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A battery box connection structure for a heavy-duty electric truck, characterized in that, include: A first connecting seat fixed to the longitudinal beam of the vehicle frame, the first connecting seat having a first connecting hole extending in the horizontal direction and a first positioning hole extending in the vertical direction; A second connecting seat fixed to the longitudinal beam supporting the battery box, the second connecting seat having a second connecting hole extending in the horizontal direction and a first positioning shaft extending in the vertical direction and matching the first positioning hole; A pin, one end of which is connected to the first connecting hole of the first connecting seat and the second connecting hole of the second connecting seat, and the other end is connected to the battery box support longitudinal beam away from the side of the vehicle frame.

2. The battery box connection structure for a heavy-duty electric truck according to claim 1, characterized in that, The upper region of the first connecting seat is provided with a first connecting area that matches the outer side of the frame longitudinal beam. The first connecting area is connected to the frame longitudinal beam by a fastening assembly. The middle region of the first connecting seat is provided with a positioning plate that extends horizontally. The positioning plate is provided with the first positioning hole. The lower region of the first connecting seat is provided with two parallel and spaced-apart lugs. The two lugs are provided with the first connecting hole that is coaxially arranged.

3. The battery box connection structure for a heavy-duty electric truck according to claim 2, characterized in that, The second connecting seat includes a connecting seat body disposed in the central region and at least one set of second connecting parts disposed on the outer periphery of the connecting seat body. The second connecting hole is opened on the side of the connecting seat body, the first positioning shaft is connected to the upper surface of the connecting seat body, and the second connecting parts are connected to the battery box support longitudinal beam through a fastening assembly.

4. The battery box connection structure for a heavy-duty electric truck according to claim 3, characterized in that, The connecting body of the second connecting seat is located inside the two lugs of the first connecting seat, and a first buffer pad is provided between the upper surface of the connecting body and the positioning plate of the first connecting seat.

5. The battery box connection structure for a heavy-duty electric truck according to claim 4, characterized in that, The second connecting seat further includes a buffer assembly disposed in the second connecting hole. The buffer assembly includes a connecting sleeve and a first rubber ring. The connecting sleeve is adapted to cooperate with the pin. The first rubber ring is located between the connecting sleeve and the inner wall of the second connecting hole of the second connecting seat. A second rubber ring is provided in the area where the pin cooperates with the connecting sleeve.

6. The battery box connection structure for a heavy-duty electric truck according to claim 5, characterized in that, The second connecting hole is a stepped hole, and the connecting sleeve is a T-shaped sleeve. One end face of the first rubber ring abuts against the stepped surface of the second connecting hole, and the other end face abuts against the stepped surface of the connecting sleeve. There is a gap between the outer peripheral surface of the large diameter area of ​​the connecting sleeve and the second connecting hole of the second connecting seat.

7. The battery box connection structure for a heavy-duty electric truck according to claim 2, characterized in that, The first connecting hole of the first connecting seat near the longitudinal beam of the frame is a smooth hole, and the first connecting hole of the first connecting seat away from the longitudinal beam of the frame is a threaded hole. The end region of the pin is constructed as a tapered conical shaft and mates with the first connecting hole near the longitudinal beam of the frame. The part of the pin that mates with the first connecting hole away from the longitudinal beam of the frame has external threads. The pin is threadedly connected to the first connecting seat and locked by a nut sleeved on the pin.

8. The battery box connection structure for a heavy-duty electric truck according to claim 1, characterized in that, A third connecting hole extending horizontally is provided on the battery box support longitudinal beam away from the frame side, and the pin is rotatably inserted into the third connecting hole; a plug is provided at the end of the pin away from the frame longitudinal beam, and the end of the plug is provided with a plug interface suitable for inserting a connecting wrench.

9. The battery box connection structure for a heavy-duty electric truck according to claim 8, characterized in that, A rotating positioning pin is also provided on the battery box support longitudinal beam away from the vehicle frame side. The rotating positioning pin has a first working position and a second working position. When the rotating positioning pin is in the first working position, the end of the rotating positioning pin abuts against the side of the pin shaft to lock the position of the pin shaft. When the rotating positioning pin is in the second working position, the end of the rotating positioning pin disengages from the side of the pin shaft to unlock the position of the pin shaft.

10. A heavy-duty electric truck, characterized in that, include: The vehicle frame includes longitudinal beams and crossbeams. A battery box assembly, the battery box assembly including a battery box support longitudinal beam, a battery box support cross beam and a battery pack; And the battery box connection structure according to any one of claims 1-9.

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