Battery pack lifting and maintaining device

Abstract

The utility model discloses a battery pack lifting maintenance device which comprises a gantry crane, a lifting device and a lifting mechanism, a walking mechanism is arranged at the bottom of the gantry crane, and the lifting device is arranged on an upper cross beam of the gantry crane and can move along the upper cross beam. The lifting mechanism is connected with supporting columns on the two sides of the gantry crane frame and can rotate relative to the supporting columns. By the adoption of the battery lifting and maintaining device, the battery pack maintaining and transferring efficiency in the battery replacing process can be greatly improved, the battery replacing maintenance period is shortened, the battery replacing maintenance waiting time is shortened, better service experience is provided for a user, meanwhile, the manual labor intensity and the safety risk are reduced, and the safety of the battery replacing process is guaranteed.

Description

Technical Field

[0001] This application relates to the field of battery swapping technology for new energy vehicles, specifically to a battery pack lifting and maintenance device. Background Technology

[0002] Currently, new energy vehicles have become widely popular, and their ownership is showing a continuous upward trend. Existing charging methods for new energy electric vehicles mainly include direct charging and fast-swapping. Fast-swapping, due to its advantages of short battery swapping time and high efficiency, has gained favor among some users. Furthermore, as usage time increases, the battery packs of the first batch of new energy electric vehicles are gradually reaching the end of their service life, and direct-charging new energy vehicles are increasingly facing the need for battery pack disassembly, maintenance, or replacement.

[0003] In related technologies, battery pack maintenance typically involves using a workbench to support the battery pack or using lifting equipment to suspend it for easy access. However, the battery pack's posture is usually fixed when placed on the workbench or lifted. When maintenance requires multi-angle adjustments, personnel must repeatedly adjust the battery pack's position on the workbench or its lifting location, or constantly reposition themselves. This makes the entire maintenance process time-consuming and labor-intensive. Furthermore, existing workbenches or lifting equipment used for battery pack maintenance are mostly fixed structures, lacking sufficient flexibility.

[0004] This shows that existing technologies still have certain shortcomings. Utility Model Content

[0005] This application provides a battery pack lifting and maintenance device to solve at least one of the above-mentioned technical problems.

[0006] The technical solution adopted in this application is as follows:

[0007] A battery pack lifting and maintenance device includes a gantry crane, a lifting device, and a lifting mechanism. The bottom of the gantry crane is provided with a traveling mechanism. The lifting device is located on the upper crossbeam of the gantry crane and can move along the upper crossbeam. The lifting mechanism is connected to the support columns on both sides of the gantry crane and can rotate relative to the support columns.

[0008] By setting up a walking mechanism, the battery pack lifting and maintenance device in this application can be moved, which facilitates the transfer of battery packs and eliminates the need for separate transfer equipment to transport battery packs. By enabling the lifting mechanism to rotate relative to the support column, the angle of the battery pack can be adjusted according to maintenance needs during the lifting process, so that maintenance personnel can perform maintenance operations. At the same time, by setting up a lifting device, it is also convenient to transport battery packs and adjust the posture of the lifting mechanism.

[0009] In a preferred embodiment of this application, the lifting mechanism includes a main frame, a fixing member disposed on the main frame, and a battery pack lifting plate. The inner side of the main frame is surrounded by a receiving space for accommodating the battery pack lifting plate and the battery pack. The fixing member is used to fix the battery pack lifting plate or directly fix the battery pack. The main frame includes two side beams rotatably connected to the support column and two movable beams cooperating with the side beams, and at least one of the movable beams can move along the side beams.

[0010] In the above solution, the size of the internal space of the main frame can be adjusted by moving the movable beam relative to the side beam, so as to adapt to the load-bearing needs of battery pack carriers of different sizes and battery packs. This is beneficial to improving the versatility of the equipment. At the same time, it can avoid the difficulty of load-bearing coordination caused by excessive distance between the movable beam and the battery pack, and also avoid the movable beam blocking the battery pack and maintenance personnel, thus affecting normal maintenance operations.

[0011] In a preferred embodiment of this application, multiple fasteners are provided, and the multiple fasteners are provided on two movable beams. The fasteners can move along the movable beams, which helps to reduce the difficulty of maintenance operations and improve maintenance efficiency.

[0012] In the above scheme, setting multiple fasteners helps to ensure the stability of the connection structure between the battery pack and the main frame, and ensures that the main frame can stably support the battery pack. The fact that the fixing frame can move relative to the movable beam helps to adapt to the connection and fixing needs of battery packs of different specifications / structures, and helps to improve the versatility of the equipment.

[0013] In a preferred embodiment of this application, a first limiting member connected to the main frame and the gantry crane, and a second limiting member connected to the movable beam and the side beam are further included. The first limiting member is used to limit the relative angle between the main frame and the support column, and the second limiting member is used to limit the relative position between the movable beam and the side beam.

[0014] In the above solution, the first limiting component can limit the main frame when it rotates to the angle required for maintenance, so that the main frame and the battery pack it carries can maintain a stable posture during the current maintenance process, so that maintenance personnel can maintain the battery pack. The second limiting component can prevent the movable beam from moving relative to the side beam when the main frame carries the battery pack and rotates, thus losing its limiting and fixing function for the battery pack, preventing the battery pack from falling and causing damage to the battery pack and / or equipment structure, and also preventing personal injury to the operators.

[0015] In a preferred embodiment of this application, the gantry crane further includes a reinforcing beam disposed on the side of the support column, the first limiting member is a limiting rod, a first limiting hole is provided on the side beam, and a second limiting hole that can match the first limiting hole is provided on the reinforcing beam and / or the support column. Multiple first limiting holes and multiple second limiting holes are provided, and the limiting rod can pass through the first limiting hole and the second limiting hole and engage with the first limiting hole and the second limiting hole for limiting cooperation.

[0016] In the above scheme, the structural strength of the gantry crane can be improved by setting a reinforcing beam, thereby increasing its load-bearing capacity and improving the versatility of the equipment. In addition, the cooperation structure between the limit rod and the first limit hole and the second limit hole is simple, the limit is reliable and the disassembly and assembly are convenient, which helps to improve the adjustment and positioning efficiency, and thus improve the maintenance efficiency of the battery pack.

[0017] In a preferred embodiment of this application, the second limiting member includes an end limiting member disposed at the end of the side beam and a follow-up limiting member that moves with the movable beam.

[0018] In the above scheme, the setting of follow-up limiting components facilitates flexible adjustment and fixation of the position of the movable beam. By setting end limiting components at the ends of the side beams, it is possible to prevent the movable beam and battery pack from directly detaching from the side beams and falling when the follow-up limiting components fail. This avoids threats to the battery pack structure, battery lifting and maintenance device structure, surrounding equipment structure, and the personal safety of related operators, thereby improving the safety of the device during use.

[0019] In a preferred embodiment of this application, the fixing member includes a sliding part sleeved on the movable beam and a connecting part connected to the sliding part. The connecting part is connected to the battery pack lifting plate or the battery pack. The connecting part and / or the sliding part are provided with a lifting ring, and the lifting device can be connected to the lifting ring.

[0020] In the above solution, by setting a sliding part, the fixing part can move along the movable beam. In conjunction with the movement of the opposite side beam of the movable beam, the position of the fixing part can be flexibly adjusted to adapt to the connection and fixing needs of battery pack lifting plates or battery packs of different specifications, ensuring that the lifting mechanism can stably support the battery pack for maintenance.

[0021] In a preferred embodiment of this application, the traveling mechanism includes a plurality of casters disposed at the bottom of the gantry crane and a traveling positioning mechanism connected to the gantry crane, the traveling positioning mechanism being used to define the position of the gantry crane.

[0022] In the above solution, the use of casters facilitates the position adjustment of the battery pack lifting and maintenance device in this application, thereby enabling the battery pack lifting and maintenance device in this application to flexibly dock with battery swapping vehicles and / or other battery pack maintenance equipment, reducing the limitations of site environment on the reception and transfer of battery swapping, which is conducive to improving the maintenance and replacement efficiency of battery packs. By setting up a walking positioning mechanism, the battery pack lifting and maintenance device in this application can be fixed in the required position, avoiding the device structure from shaking during battery pack maintenance and affecting the normal maintenance operation of the battery pack.

[0023] In a preferred embodiment of this application, a reinforcing support is also provided between the upper crossbeam and the support column.

[0024] Since the battery packs of new energy vehicles are usually quite heavy, the battery pack lifting and maintenance device needs to ensure sufficient structural strength to stably lift and support the battery pack. By strengthening the support, the load-bearing capacity of the upper crossbeam and the stability of the connection mechanism between it and the support column can be effectively improved. This ensures that the upper crossbeam can provide sufficient load-bearing capacity when the lifting device lifts the battery pack, preventing the battery pack from falling.

[0025] In a preferred embodiment of this application, the system further includes a walking drive device connected to the walking mechanism for driving the walking mechanism to move, a rotation drive device connected to the lifting mechanism for driving the lifting mechanism to rotate relative to the support column, a sliding drive device connected to the lifting device for driving the lifting device to move relative to the upper crossbeam, and a control system. The control system is connected to the walking drive device, the rotation drive device, the lifting device, and the sliding drive device, respectively.

[0026] The above-mentioned setup can improve the automation level of the battery lifting and maintenance device in this application, which is conducive to reducing the difficulty and labor intensity of manual operation during equipment operation, improving equipment efficiency, and also reducing safety risks during manual operation.

[0027] In summary, the battery lifting and maintenance device described in this application can greatly improve the efficiency of battery pack maintenance and transportation during the battery swapping process, shorten the battery swapping maintenance cycle, reduce battery swapping maintenance waiting time, provide users with a better service experience, and at the same time help reduce the intensity of manual labor and safety risks, and ensure the safety of the battery swapping process. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of a battery pack lifting and maintenance device as an example.

[0030] Figure 2 This is a side view of a battery pack lifting and maintenance device as an example.

[0031] Figure 3 This is a side view of the battery pack lifting and maintenance device in another example.

[0032] Figure 4 This is a top view of the lifting mechanism in an example.

[0033] List of components and reference numerals:

[0034] 1. Gantry crane, 11. Upper crossbeam, 12. Support column, 13. Reinforcing support, 14. Reinforcing beam, 15. Second limit hole, 16. Universal wheel, 17. Travel positioning mechanism;

[0035] 2. Lifting equipment;

[0036] 3 Lifting mechanism, 31 Main frame, 311 Side beam, 312 Movable beam, 313 First limiting hole, 32 Fixing component, 321 Sliding part, 322 Connecting part, 323 Lifting ring, 33 First limiting component, 34 Second limiting component, 35 Follow-up limiting component;

[0037] 4. Battery pack support tray or battery pack. Detailed Implementation

[0038] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0040] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0043] Reference Figure 1-4As shown, this application discloses a battery pack lifting and maintenance device, which includes a gantry crane 1, a lifting device 2, and a lifting mechanism 3. A traveling mechanism is provided at the bottom of the gantry crane 1. The lifting device 2 is provided on the upper crossbeam 11 of the gantry crane 1 and can move along the upper crossbeam 11. The lifting mechanism 3 is connected to the support columns 12 on both sides of the gantry crane 1 and can rotate relative to the support columns 12. In the above scheme, the walking mechanism facilitates the position adjustment of the battery repair device in this application, and also facilitates direct docking between the battery repair device and battery swapping vehicles, battery pack transfer vehicles, or other battery pack maintenance equipment to receive and carry the battery pack. This facilitates the transfer of battery packs and eliminates the need for separate transfer equipment to move the battery packs, reducing equipment costs and streamlining processes. This improves the efficiency of battery pack transfer and maintenance. Furthermore, the above structure allows for adjustment of the battery pack's angle relative to the support column 12 by rotating the lifting mechanism 3 as needed, enabling maintenance personnel to perform maintenance operations without needing to change positions around the battery pack and lifting mechanism 3 to find the operating angle. The lifting device 2 not only lifts the battery pack to facilitate transfer between the battery pack lifting and repair device in this application and battery swapping vehicles, battery pack transfer vehicles, or other battery pack maintenance equipment, but also assists in the attitude changes and maintenance of the lifting mechanism 3 and the battery pack, ensuring the stability of the battery pack's attitude during maintenance and guaranteeing the safety of battery pack maintenance.

[0044] Furthermore, referring to Figure 2 , Figure 3 and Figure 4 As shown, the lifting mechanism 3 includes a main frame 31, a fixing member 32 mounted on the main frame 31, and a battery pack lifting plate. The inner side of the main frame 31 has a receiving space for accommodating the battery pack lifting plate and the battery pack. The fixing member 32 is used to fix the battery pack support plate or directly fix the battery pack. The main frame 31 includes two side beams 311 rotatably connected to the support column 12 and two movable beams 312 that cooperate with the side beams 311, and at least one movable beam 312 can move along the side beams 311. By moving the movable beams 312 relative to the side beams 311, the size of the receiving space inside the main frame 31 can be adjusted, thereby adapting to the installation needs of battery pack support plates or battery packs of different specifications, which is beneficial to improving the versatility of the equipment. At the same time, it can avoid the difficulty of load-bearing coordination caused by excessive distance between the movable beams 312 and the battery pack support plate or battery pack, and it can also avoid the movable beams 312 blocking the battery pack and maintenance personnel, affecting normal maintenance operations. Preferably, the side beam 311 can also adopt a telescopic sleeve structure, which can extend the length of the side beam 311 to provide a longer moving distance for the movable beam 312, and also make the accommodation space adjustment range larger and the application range wider.

[0045] In one example, refer to Figure 2 As shown, both movable beams 312 can move along the side beams 311. This arrangement allows for both size and position adjustments of the storage space, and ensures that the center of the battery pack is always located in the middle of the main frame 31. This prevents uneven stress on both ends of the main frame 31 due to battery pack offset, thus avoiding affecting the stability of the connection structure between the main frame 31 and the battery pack. In another example, refer to... Figure 3 As shown, only one movable beam 312 can move along the side beam 311. This arrangement ensures that one movable beam 312 remains fixedly connected to the side beam 311, providing a secure connection to one side of the battery pack. While allowing adjustment of the storage space, it prevents the battery pack from slipping due to the simultaneous failure of the limiting structures between the movable beams 312 and the side beam 311, thus avoiding unnecessary property damage and personal safety risks. It should be noted that the above example is merely a preferred embodiment of this application. The battery lifting and supporting device in this application can freely choose the schemes in the two examples above according to actual usage needs. Of course, the main frame 31 can also adopt a configuration with fully fixed side beams 311 and an additional adjustable support structure; this application does not specifically limit this.

[0046] Continue to refer to Figures 1-4 As shown, multiple fasteners 32 are provided, and these fasteners 32 are mounted on two movable beams 312. The fasteners 32 can move along the movable beams 312, which helps reduce maintenance difficulty and improve maintenance efficiency. Providing multiple fasteners 32 helps ensure the stability of the connection structure between the battery pack and the main frame 31, ensuring that the main frame 31 can stably support the battery pack. The ability of the fasteners to move relative to the movable beams 312 helps adapt to the connection and fixing needs of battery packs of different specifications / structures, thus improving the equipment's versatility. Preferably, the fastener 32 includes a sliding part 321 sleeved on the movable beam 312 and a connecting part 322 connected to the sliding part 321. The connecting part 322 is connected to the battery pack support plate or the battery pack itself. The connecting part 322 and / or the sliding part 321 are provided with a lifting ring 323, and the lifting device 2 can cooperate with the lifting ring 323. By setting the sliding part 321, it is easier for the fixing part 32 to move along the movable beam 312. In conjunction with the movement of the opposite side beam 311 of the movable beam 312, the position of the fixing part 32 can be flexibly adjusted to adapt to the connection and fixing needs of battery pack lifting plates or battery packs 4 of different specifications, ensuring that the lifting mechanism 3 can stably support the battery pack for maintenance. By setting the lifting ring 323, it is easier to cooperate with the lifting device 2 to realize the attitude adjustment of the main frame 31 and the battery pack.

[0047] Furthermore, referring to Figure 1As shown, the battery lifting and maintenance device in this application also includes a first limiting member 33 connected to the main frame 31 and the gantry crane 1, and a second limiting member 34 connected to the movable beam 312 and the side beam 311. The first limiting member 33 is used to limit the relative angle between the main frame 31 and the support column 12, and the second limiting member 34 is used to limit the relative position between the movable beam 312 and the side beam 311. In one example, refer to... Figure 2 and Figure 3 As shown, the gantry crane 1 also includes a reinforcing beam 14 disposed on the side of the support column 12. The first limiting member 33 is a limiting rod. A first limiting hole 313 is provided on the side beam 311. A second limiting hole 15 that can match the first limiting hole 313 is provided on the reinforcing beam 14 and / or the support column 12. Multiple first limiting holes 313 and second limiting holes 15 are provided. The limiting rod can pass into the first limiting hole 313 and the second limiting hole 15 and be limited and matched with the first limiting hole 313 and the second limiting hole 15. The cooperation between the first limiting member 33 and the first limiting hole 313 and the second limiting hole 15 can limit the main frame 31 when it rotates to the required maintenance angle, ensuring that the main frame 31 and the battery pack it carries maintain a stable posture during the current maintenance process, facilitating maintenance personnel to maintain the battery pack. The second limiting member 34 can prevent the movable beam 312 from moving relative to the side beam 311 when the main frame 31 rotates while carrying the battery pack, thus preventing the battery pack from falling and causing damage to the battery pack and / or equipment structure, and also preventing personal injury to the operators. At the same time, the addition of the reinforcing beam 14 can improve the structural strength of the gantry crane 1, thereby increasing its load-bearing capacity and improving the equipment's versatility. Furthermore, the cooperation structure between the limiting rod and the first limiting hole 313 and the second limiting hole 15 is simple, reliable, and easy to install and remove, which helps improve adjustment and positioning efficiency, thereby improving the maintenance efficiency of the battery pack.

[0048] Continue to refer to Figure 2 and Figure 3 As shown, the second limiting member 34 includes an end limiting member disposed at the end of the side beam 311 and a follower limiting member 35 that moves with the movable beam 312. Specifically, refer to... Figure 2 and Figure 3As shown, the end of the side beam 311 is provided with a mounting hole. The end limiting member includes a limiting part and a connecting part 322, such as a connecting rod or a connecting ring, which is connected to the limiting part and can be detachably connected to the mounting hole. The connecting part 322 is connected and cooperates with the mounting hole. The limiting part protrudes from the upper part and / or lower part of the side beam 311 to limit the movable beam 312. The follower limiting member 35 includes a locking screw provided at the end of the movable beam 312. When the movable beam 312 reaches the required position, the friction between the contact surface between the side beam 311 and the movable beam 312 is increased by rotating the locking screw, thereby limiting the movable beam 312. At the same time, the follower limiting member 35 can also be used as a gripper during the adjustment of the movable beam 312 to provide the operator with a more convenient position for applying force. It should also be noted that the above examples are only some preferred examples of this application. The setting of the first limiting member 33 and the second limiting member 34 in this application is not limited to the above examples. They can also adopt other different limiting structures and setting methods. This application does not make any specific limitations on this.

[0049] In the above scheme, the follow-up limiting component 35 is used to flexibly adjust and fix the position of the movable beam 312. By setting the end limiting component at the end of the side beam 311, the movable beam 312 and the battery pack can be prevented from falling directly off the side beam 311 when the follow-up limiting component 35 fails. This avoids threats to the battery pack structure, the battery lifting and maintenance device structure, the surrounding equipment structure, and the personal safety of the surrounding operators, and improves the safety of the device during use.

[0050] Continue to refer to Figure 1 , Figure 2 and Figure 3As shown, the traveling mechanism includes multiple casters 16 mounted at the bottom of the gantry crane 1 and a traveling positioning mechanism 17 connected to the gantry crane 1. The traveling positioning mechanism 17 is used to limit the position of the gantry crane 1. A reinforcing support 13 is also provided between the upper crossbeam 11 and the support column 12. In the above scheme, the use of casters 16 facilitates the position adjustment of the battery pack lifting and maintenance device in this application, thereby enabling the battery pack lifting and maintenance device in this application to flexibly dock with battery swapping vehicles and / or other battery pack maintenance equipment, reducing the limitations of site environment on the reception and transfer of battery swapping, and improving the maintenance and replacement efficiency of battery packs. By setting the traveling positioning mechanism 17, the battery pack lifting and maintenance device in this application can be fixed in the required position, avoiding the device structure from shaking during battery pack maintenance and affecting the normal maintenance operation of the battery pack. Since the battery packs of new energy vehicles are usually quite heavy, the battery pack lifting and maintenance device needs to ensure sufficient structural strength to stably lift and support the battery pack. By strengthening the support 13, the load-bearing capacity of the upper crossbeam 11 and the stability of the connection mechanism between it and the support column 12 can be effectively improved. This ensures that the upper crossbeam 11 can provide sufficient load-bearing capacity when the lifting device 2 lifts the battery pack, thus preventing the battery pack from falling.

[0051] In a preferred embodiment of this application, the battery lifting and maintenance device further includes a walking drive device connected to the walking mechanism for driving the walking mechanism to move, a rotation drive device connected to the lifting mechanism 3 for driving the lifting mechanism 3 to rotate relative to the support column 12, a sliding drive device connected to the lifting device 2 for driving the lifting device 2 to move relative to the upper crossbeam 11, and a control system. The control system is connected to the walking drive device, the rotation drive device, the lifting device 2, and the sliding drive device, respectively. This configuration improves the automation level of the battery lifting and maintenance device, reduces the difficulty and labor intensity of manual operation, increases equipment efficiency, and also reduces safety risks during manual operation.

[0052] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0053] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. The above descriptions are merely embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A battery pack lifting and maintenance device, characterized in that, The system includes a gantry crane, a lifting device, and a support mechanism. The bottom of the gantry crane is equipped with a traveling mechanism. The lifting device is located on the upper crossbeam of the gantry crane and can move along the upper crossbeam. The support mechanism is connected to the support columns on both sides of the gantry crane and can rotate relative to the support columns.

2. The battery pack lifting and maintenance device as described in claim 1, characterized in that, The lifting mechanism includes a main frame, a fixing member disposed on the main frame, and a battery pack lifting plate. The inner side of the main frame is surrounded by a receiving space for accommodating the battery pack lifting plate and the battery pack. The fixing member is used to fix the battery pack lifting plate or directly fix the battery pack. The main frame includes two side beams rotatably connected to the support column and two movable beams cooperating with the side beams, and at least one of the movable beams can move along the side beams.

3. The battery pack lifting and maintenance device as described in claim 2, characterized in that, Multiple fasteners are provided, and the multiple fasteners are provided on two movable beams, and the fasteners are movable along the movable beams.

4. The battery pack lifting and maintenance device as described in claim 2, characterized in that, It also includes a first limiting member connected to the main frame and the gantry crane, and a second limiting member connected to the movable beam and the side beam. The first limiting member is used to limit the relative angle between the main frame and the support column, and the second limiting member is used to limit the relative position between the movable beam and the side beam.

5. The battery pack lifting and maintenance device as described in claim 4, characterized in that, The gantry crane also includes a reinforcing beam disposed on the side of the support column. The first limiting member is a limiting rod. A first limiting hole is provided on the side beam. A second limiting hole that can match the first limiting hole is provided on the reinforcing beam and / or the support column. Multiple first limiting holes and multiple second limiting holes are provided. The limiting rod can pass through the first limiting hole and the second limiting hole and engage with the first limiting hole and the second limiting hole for limiting.

6. The battery pack lifting and maintenance device as described in claim 4, characterized in that, The second limiting member includes an end limiting member disposed at the end of the side beam and a follow-up limiting member that moves with the movable beam.

7. The battery pack lifting and maintenance device as described in claim 3, characterized in that, The fixing component includes a sliding part sleeved on the movable beam and a connecting part connected to the sliding part. The connecting part is connected to the battery pack lifting plate or the battery pack. The connecting part and / or the sliding part are provided with a lifting ring, and the lifting device can be connected to the lifting ring.

8. The battery pack lifting and maintenance device as described in claim 1, characterized in that, The traveling mechanism includes multiple casters disposed at the bottom of the gantry crane and a traveling positioning mechanism connected to the gantry crane, the traveling positioning mechanism being used to define the position of the gantry crane.

9. The battery pack lifting and maintenance device as described in claim 1, characterized in that, A reinforcing support is also provided between the upper crossbeam and the supporting column.

10. The battery pack lifting and maintenance device as described in claim 1, characterized in that, It also includes a walking drive device connected to the walking mechanism for driving the walking mechanism to move, a rotation drive device connected to the lifting mechanism for driving the lifting mechanism to rotate relative to the support column, a sliding drive device connected to the lifting device for driving the lifting device to move relative to the upper crossbeam, and a control system, wherein the control system is connected to the walking drive device, the rotation drive device, the lifting device, and the sliding drive device respectively.

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