Transport device and loading / unloading assistance device

Abstract

The utility model relates to a conveying device and an auxiliary loading and unloading device, which are used for conveying a battery box and comprise a main frame, a rolling piece and a limiting piece, and the rolling piece is rotatably connected with the main frame and used for bearing and conveying the battery box; and the limiting piece is detachably connected with the rolling piece and is used for limiting the position of the battery box in the first direction. The rolling pieces are rotationally connected to the main frame, so that the battery boxes are in rolling contact with the rolling pieces, the friction force in the conveying process of the battery boxes is reduced, and the battery boxes can be quickly and conveniently conveyed to the battery trays in the battery rack; the limiting pieces are connected with the rolling pieces in an inserted mode, the limiting pieces cannot occupy the position in the main frame when installed, the rolling pieces can be evenly arranged on the main frame, the conveying length of the rolling pieces is prolonged, and the smoothness of the conveying process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery assembly, in particular to a conveying device and a loading and unloading auxiliary device. Background Art

[0002] With the proposal of the "carbon neutrality" goal, the energy storage industry has entered a stage of rapid development, especially in the fields of renewable energy and energy storage technology. Large-scale containerized energy storage systems have attracted much attention as an effective energy storage solution: large-scale containerized energy storage can store energy during peak energy hours and release energy during peak demand hours, which helps balance the supply and demand of the power system, improve energy utilization efficiency, and reduce greenhouse gas emissions.

[0003] In conventional technology, a limiter is usually provided in the battery box conveying mechanism to limit the movement of the battery box. However, conventional limiters are generally provided in the transmission components of the conveying mechanism, occupying the installation space of the conveying mechanism; and when the battery box moves at the installation position of the limiter, the friction force is large, which affects the conveying efficiency of the battery box. Utility Model Content

[0004] Based on this, the utility model provides a transport device and a loading and unloading auxiliary device to solve the problems of low assembly efficiency and low assembly safety of the battery box.

[0005] In a first aspect, the present application provides a transport device for transporting a battery box, comprising: a main frame; a rolling member rotatably connected to the main frame and used to carry and transport the battery box; and a limiting member detachably connected to the rolling member and used to limit the position of the battery box in a first direction.

[0006] In one embodiment, the limiting member includes: a stopper detachably connected to the rolling member and used to abut the battery box to limit the movement of the battery box in a first direction; and an operating part connected to the stopper and used to operate the stopper to connect or separate with the rolling member.

[0007] In one embodiment, the block includes an insert portion, which includes: a vertical portion, including a first vertical portion and a second vertical portion arranged in parallel, and the spacing between the first vertical portion and the second vertical portion is less than or equal to the outer diameter of the rolling element; an arc portion, connected to the vertical portion, and the diameter of the circle where the arc portion is located is less than or equal to the outer diameter of the rolling element.

[0008] In one embodiment, the length of the vertical portion is greater than the spacing between adjacent rolling elements.

[0009] In one embodiment, the limiting member further includes a buffer portion, and the buffer portion is arranged on two surfaces of the stopper that are away from each other.

[0010] In one embodiment, a plurality of limiting members are included, and a battery box accommodation space is formed between adjacent limiting members.

[0011] In one of the embodiments, the rolling member is arranged and connected in the main frame, and the rolling member is in rolling contact with the battery box to move the battery box along the first direction.

[0012] In one embodiment, the transport device further comprises a blocking rod, which is connected to the first end of the main frame and is located above the rolling element, and is used to limit the movement of the battery box in the opposite direction to the first direction.

[0013] In one embodiment, the transport device further includes a carrying platform, and the carrying platform is used to carry the main frame.

[0014] In a second aspect, the present application provides a loading and unloading auxiliary device, comprising any transport device as in the first aspect.

[0015] The above-mentioned transport device and loading and unloading auxiliary device, by rotating and connecting the orderly arranged rolling parts to the main frame, make the battery box and the rolling parts rolling contact, thereby reducing the friction during the transportation of the battery box, and can make the battery box quickly and conveniently transported to the battery tray in the battery rack; the limit member is connected to the rolling part by plugging, and the limit member will not occupy the position in the main frame when installed, so that the main frame can evenly arrange the rolling parts, extending the transportation length of the rolling parts and improving the smoothness of the transportation process; the limit member is plugged in, so that the limit member can be flexibly disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of a conveying device in one embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a position limiting member in one embodiment of the utility model;

[0019] Figure 3 This is a schematic structural diagram of a conveying device in another embodiment of the utility model;

[0020] Figure 4 This is a schematic structural diagram of a position limiting member in another embodiment of the utility model;

[0021] Figure 5It is a structural schematic diagram of a loading and unloading auxiliary device in one embodiment of the utility model.

[0022] The reference numerals in the specific implementation manner are as follows:

[0023] 10. Main frame, 20. Rolling member, 30. Limiting member, 40. Blocking rod, 302. Operating portion, 304. Stopper, 306. Connecting portion, 308. Arc portion, 310. Vertical portion, 312. Buffer portion, 50. Loading and unloading auxiliary device, 502. First surface. DETAILED DESCRIPTION

[0024] The following is a detailed description of the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] In the present invention, unless otherwise clearly specified or limited, the first direction is the X direction.

[0032] See also Figure 1 , Figure 1A schematic diagram of the structure of a conveying device in an embodiment of the utility model is shown. An embodiment of the utility model provides a conveying device, including a main frame 10, a rolling member 20 and a limiting member 30. The rolling members 20 are arranged horizontally in sequence and are rotatably connected to the main frame 10. When the conveying device conveys a battery box, the first surface 502 of the battery box is in rolling contact with the rolling member 20. Exemplarily, the first surface of the battery box is the bottom surface of the battery box; as the rolling member 20 rolls, the conveying device conveys the battery box along a first direction, wherein the first direction is the conveying direction of the battery box; the limiting member 30 is detachably connected to the rolling member 20, and the position of the battery box along the first direction is limited by the limiting member. Exemplarily, the rolling member 20 is a roller, and the roller is rotationally connected to the main frame 10. Exemplarily, the roller is rotationally connected to the main frame 10 via a bearing or the like. The battery box is transported to the battery tray in the battery rack by the rotation of a plurality of arranged rolling members 20. The plurality of rolling members 20 are located in the same horizontal plane, and the spacing between each rolling member is uniform. The limiting member 30 is connected to the rolling member 20 in a detachable and plug-in manner. When the battery box is transported to the specified position, the limiting member 30 is removed, and the battery box is still in rolling contact at this position, and the battery box continues to be transported by the rolling member 20. At the installation position of the limiting member, there is no need to change the structure of the transport device.

[0033] In this embodiment, the orderly arranged rolling members 20 are rotatably connected to the main frame 10 so that the battery box and the rolling members 20 are in rolling contact, thereby reducing the friction during the transportation of the battery box, and the battery box can be quickly and conveniently transported to the battery tray in the battery rack; the limit member 30 is connected to the rolling member 20 by plugging, and the limit member 30 does not occupy the position in the main frame 10 when installed. The main frame 10 improves the smoothness of the transportation process by evenly arranging the rolling members 20; the limit member 30 is plugged in so that the limit member 30 can be flexibly disassembled.

[0034] See also Figure 2 and Figure 3 , Figure 2 The structure diagram of the position limiting member 30 in one embodiment of the utility model is shown. Figure 3 A schematic structural diagram of a conveying device in another embodiment of the utility model is shown. In some embodiments, the limiting member 30 includes a stopper 304 and an operating portion 302 .

[0035] The block 304 is used to abut the battery box and limit the position of the battery box in the first direction, so as to prevent the battery box from sliding off the conveying device or colliding with the adjacent battery box on the conveying device during transportation, causing damage to the battery box. Without limitation, the shape of the block 304 can be adapted to the rolling element and can be detachably connected to the rolling element. Optionally, the block 304 can be made of a material having a certain hardness and a certain elasticity, such as silicone, rubber, etc., to ensure that when the battery box collides with the block during transportation, the block can stably block the position of the battery box in the first direction without causing damage to the battery box.

[0036] The operating portion 302 is fixedly connected to the end of the stopper 304 away from the rolling element, and the operating portion is used to operate the stopper to be plugged into or separated from the rolling element. Optionally, the operating portion is an inverted U-shaped handle, and the stopper can be pulled up from the rolling element by holding the operating portion to separate the stopper from the rolling element, or the stopper can be aligned with the rolling element to be plugged into the rolling element.

[0037] In one embodiment, the transport device transports multiple battery boxes at the same time. Figure 3 and Figure 5 As shown, a first battery box and a second battery box are taken as examples for specific description. According to the sizes of the first battery box and the second battery box (such as the length and width of the battery box), a plurality of limit members 30 are inserted into the rolling member, and a receiving space is formed between adjacent limit members 30. The first battery box and the second battery box are respectively placed in the corresponding receiving spaces. The first battery box and the second battery box can respectively abut against the limit members 30 on both sides thereof, thereby limiting the positions of the first battery box and the second battery box in the first direction, preventing the first battery box and the second battery box from sliding off the conveying device, and avoiding collision between the first battery box and the second battery box.

[0038] Optionally, multiple limit members 30 are selectively installed on the two rolling members 20 according to the length of the battery box. During the overall transportation of the battery box conveying device, the battery box will not shake due to the limitation of the two limit members 30; the limit members 30 can also be 4 or more, and the conveying device can carry multiple battery boxes at one time. Each battery box is isolated by the limit members 30 to prevent mutual collision and impact.

[0039] In this embodiment, a limit member 30 is provided to limit the position of the battery box along the first direction to prevent the battery box from exceeding a predetermined range during transportation and causing losses. A plurality of limit members 30 are used to separate the battery boxes on the rolling element 20 to ensure that a safe distance is maintained between adjacent battery boxes to prevent mutual interference and collision between the battery boxes and to ensure that the battery boxes can accurately reach the predetermined position of the rolling element 20. Since the limit member 30 is provided with an operating part, the operating part can be used to conveniently operate the connection or separation of the stop block 304 and the rolling element 20. When the battery box needs to be moved, the state of the limit member 30 can be quickly adjusted.

[0040] Please continue reading Figure 2 In some embodiments, the stopper 304 includes a plug-in portion 306, which includes a vertical portion 310 and an arc portion 308. The vertical portion 310 includes a first vertical portion and a second vertical portion arranged in parallel, and the spacing between the first vertical portion and the second vertical portion is less than or equal to the outer diameter of the rolling element 20; the arc portion 308 is connected to the vertical portion 310, and the diameter of the circle where the arc portion 308 is located is less than or equal to the outer diameter of the rolling element 20; specifically, the stopper 304 has a certain elasticity, and when the spacing between the first vertical portion and the second vertical portion is less than or equal to the outer diameter of the rolling element 20, the stopper 304 can be firmly embedded with the rolling element 20 to prevent the stopper 304 from falling off the rolling element 20. The plug-in portion 306 is arranged to be separated from the operating portion 302, and the vertical portion 310 and the arc portion 308 form a U-shaped opening, which is plugged into the rolling element 20. Exemplarily, the stopper 304 is made of silicone material, the spacing between the first vertical portion and the second vertical portion is slightly smaller than the diameter of the rolling element 20, and can be freely inserted into the rolling element 20; the diameter of the arc portion 308 is smaller than or equal to the outer diameter of the rolling element 20, and can fully contact the arc of the upper part of the rolling element 20, that is, the U-shaped opening formed by the arc portion 308 and the vertical portion 310 can be fully contacted and connected with the rolling element 20, so that the stopper 304 can be stably inserted into the rolling element 20.

[0041] In one embodiment of the present application, the arcuate portion 308 and the vertical portion 310 of the plug-in portion 306 can be adapted to rolling elements 20 of different diameters. The spacing between the first vertical portion and the second vertical portion is less than or equal to the outer diameter of the rolling element 20, which can ensure that the limiter 30 can be freely plugged into or separated from the rolling element 20; the arcuate portion 308 is in full contact with the upper portion of the rolling element 20, providing a more stable connection between the limiter 30 and the rolling element 20, ensuring that the limiter 30 is not easy to fall off when limiting the battery box. The U-shaped opening of the plug-in portion 306 makes the stopper 304 more stable when plugged into the rolling element 20, which helps to ensure that the limiter 30 will not fail due to looseness during use, thereby improving the reliability and durability of the system.

[0042] Please continue reading Figure 2In some embodiments, the length of the vertical portion 310 is greater than the spacing between adjacent rolling elements 20. Since the vertical portion 310 and the arc portion 308 of the limiting member 30 are connected to the rolling element 20 by plugging, the limiting member 30 and the rolling element 20 are not fixedly connected. In this case, when the battery box abuts against the limiting member 30, the limiting member 30 may be affected by the rolling element 20 and rotate. By setting the length of the vertical portion 310 to be greater than the spacing between the adjacent rolling elements 20, when the limiting member 30 rotates, the bottom of the vertical portion 310 can abut against the adjacent rolling element 20 to maintain the position of the battery box.

[0043] Optionally, according to the size of the battery box and the size of the rolling element, a plurality of limiting members may be provided on the same rolling element to limit the position of the battery box.

[0044] In this embodiment, the length of the vertical portion 310 is greater than the spacing between adjacent rolling elements 20. When the limit member 30 tilts, the vertical portion 310 can provide additional support and form contact with the adjacent rolling element 20, thereby enhancing the stability of the limit member 30 and preventing the limit member 30 from losing its function due to external interference during use. By improving the functional stability of the limit member 30, it is possible to ensure that the battery box will not get out of control under abnormal circumstances, thereby reducing the risk of accidents.

[0045] See also Figure 4 , Figure 4 The schematic diagram of the structure of the limiter 30 in another embodiment of the utility model is shown. In some embodiments, the limiter 30 also includes a buffer portion 312, which is at least arranged on two mutually diverging surfaces of the stopper 304 and the inner side wall of the vertical portion 310. The battery box moves along the first direction through the rolling member 20. Since the rolling member 20 cannot be braked and the battery box is heavy, the battery box is subjected to a large force when it abuts against the limiter 30. When the battery box is transported by the rolling member 20, it abuts against the buffer portion 312 of the limiter 30 for buffering, and the limiter limits the battery box to move along the first direction; the two mutually diverging surfaces of the stopper 304 are both provided with buffers. When the limiter 30 is used to separate the battery boxes, the two surfaces of the limiter 30 abut against the two battery boxes respectively. Exemplarily, the limiter 30 is made of rubber, polyurethane, silicone, nitrile rubber, etc. with good elasticity.

[0046] In this embodiment, by providing a buffer portion 312 for the limiting member 30, a buffering and protective effect can be provided during the transportation and limiting process of the battery box, thereby avoiding mutual damage between the battery box and the limiting member 30, protecting corresponding components, and improving the stability and safety of the transportation process.

[0047] Please continue reading Figure 1In some embodiments, the transport device further includes a blocking rod 40, which is connected to the first end of the main frame 10 and is located above the rolling element 20. The blocking rod 40 is used to limit the movement of the battery box along the second direction, wherein the second direction is the opposite direction to the first direction. The main frame 10 is an L-shaped structure, and the first part of the main frame 10 is vertically arranged with the bearing platform. The first part of the main frame 10 is provided with through holes arranged in sequence, and the bearing of the rolling element passes through the through holes on both sides of the main frame 10 and is clamped on the main frame 10. The first end of the main frame 10 is fixedly connected to the blocking rod 40. Exemplarily, the blocking rod 40 and the main frame 10 are connected by bolts, pins, plugs or rivets, which can be selected according to the material of the blocking rod 40 and the material of the main frame 10. The second part of the main frame 10 is connected to the bearing platform. Optionally, the main frame 10 can be set to be multi-stage or integrally formed. When the battery box needs to be transported over a long distance, the rolling element is first connected to the main frame 10, and the assembled main frame 10 is arranged in sequence and fixed on the load-bearing platform to extend the transportation distance of the transport device. Since the main frame 10 is composed of two separate structures, the spacing can be flexibly adjusted according to the size of the battery box, and the rolling element can be replaced so that the rolling element 20 can match the size of the battery box. When the size of the battery box is too large, multiple limit members 30 can also be set on the same rolling element 20.

[0048] Both ends of the blocking rod 40 are fixedly connected to the first end of the main frame 10. When the battery box moves along the second direction through the rolling element 20, the blocking rod 40 limits the limit range of movement of the battery box, and the blocking rod 40 will not occupy the transport position of the rolling element 20.

[0049] In this embodiment, the main frame 10 of the conveying device is fixedly connected to the blocking rod 40, which prevents the battery box from detaching from the rolling element 20 and causing losses when moving along the second direction; the position where the blocking rod is connected to the main frame is higher than the position of the rolling element, and when blocking the battery box, it will not affect the movement state of the rolling element.

[0050] See also Figure 5 , Figure 5 The schematic diagram of the structure of the loading and unloading auxiliary device in one embodiment of the utility model is shown. Since large energy storage containers pursue high power, the battery plug-in box used has a relatively large power, which makes the weight of the battery plug-in box relatively heavy. The weight of some battery boxes reaches more than 80kg, which makes it extremely inconvenient for personnel to install and affects the loading and unloading efficiency of the battery box.

[0051] In some embodiments, the transport device further includes a load-bearing platform, the main frame 10 is connected to the load-bearing platform, and is used to fix the main frame 10, and the load-bearing platform is connected to the loading and unloading auxiliary device 50. The loading and unloading auxiliary device 50 includes a moving component and a lifting component to realize the movement and lifting of the load-bearing platform. Exemplarily, the transport device and the loading and unloading auxiliary device 50 are detachable, and different loading and unloading auxiliary devices 50 can be selected according to different transport devices. The loading and unloading auxiliary device 50 is matched and connected with the transport device, and the load-bearing platform is moved to the battery rack by the moving component, and the load-bearing platform is raised to the corresponding height of the battery tray by the lifting component, and the battery box is transported to the corresponding battery tray by the moving device along the first movement direction. Exemplarily, the load-bearing platform is adjusted to an appropriate height by a lifting component, a plurality of battery boxes are transported to the rolling member 20 of the conveying device, and the position of the battery box body is limited by a limiting member 30. The battery box is moved to a predetermined position (such as a battery rack) by the loading and unloading auxiliary device 50, and the battery box is lifted to a predetermined height by the lifting component; the limiting member 30 is separated from the rolling member 20 through the operation room, and the battery box is pushed to move in a first direction so that the battery box reaches a predetermined position (such as a battery tray); the conveying device and the battery box are moved to another position by the moving component and the lifting component, and then another limiting member 30 is separated from the rolling member 20, and the battery box is pushed to move in the first direction so that the battery box reaches the predetermined position, and the load-bearing platform is directly abutted against the battery rack by the loading and unloading auxiliary device 50, so that the conveying device can directly convey the battery box to the battery tray.

[0052] In this embodiment, by installing the transport device on the loading and unloading auxiliary device 50, the transport device can quickly and conveniently transport the battery box to a suitable location as needed, and the transport device can flexibly load and unload the battery box, thereby increasing the working range of the transport component.

[0053] In some embodiments, the transport device is moved to a predetermined position (such as a battery rack) by the loading and unloading auxiliary device 50, and the device on the supporting platform is made flush with or slightly lower than the battery tray on the battery rack by the lifting component in the loading and unloading auxiliary device 50, the battery box is taken out and placed on the transport device, the battery box moves along the second direction until it contacts the limit member or the blocking rod, and a limit member is set at the end of the battery box close to the battery rack; according to needs, the lifting component is used again to adjust the supporting platform to the required height, the battery box is taken out and placed on the transport device, the battery box moves along the second direction until it contacts the limit member, and a limit member is set at the end of the battery box close to the battery rack.

[0054] In this embodiment, through the cooperation between the transport device and the loading and unloading auxiliary device, the position of the battery box can be accurately controlled, the battery box can be removed quickly and accurately, and the transport device can flexibly assemble multiple battery boxes.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A transport device for transporting a battery box, characterized in that: The conveying device comprises: Main frame; A rolling member, rotatably connected to the main frame, for carrying and transporting the battery box; and The limiting member is detachably connected to the rolling member and is used to limit the position of the battery box in the first direction.

2. The conveying device according to claim 1, characterized in that: The limiting member comprises: a stopper detachably connected to the rolling element and configured to abut against the battery box to limit movement of the battery box in a first direction; and The operating part is connected to the stopper and is used to operate the stopper to plug or separate from the rolling element.

3. The conveying device according to claim 2, characterized in that: The stopper includes a plug-in portion, and the plug-in portion includes: A vertical portion, comprising a first vertical portion and a second vertical portion arranged in parallel, wherein a distance between the first vertical portion and the second vertical portion is less than or equal to an outer diameter of the rolling element; The arc-shaped portion is connected to the vertical portion, and the diameter of the circle where the arc-shaped portion is located is less than or equal to the outer diameter of the rolling element.

4. The conveying device according to claim 3, characterized in that: The length of the vertical portion is greater than the interval between adjacent rolling elements.

5. The conveying device according to claim 2, characterized in that: The position-limiting member further comprises a buffer portion, and the buffer portion is arranged on two surfaces of the stopper which are away from each other.

6. The conveying device according to claim 1, characterized in that: It comprises a plurality of limiting members, and an accommodating space for the battery box is formed between adjacent limiting members.

7. The conveying device according to claim 1, characterized in that: The rolling member is arranged and connected in the main frame, and the rolling member is in rolling contact with the battery box to make the battery box move along a first direction.

8. The conveying device according to claim 1, characterized in that: The transport device further comprises a blocking rod, which is connected to the first end of the main frame and is located above the rolling element, and is used to limit the movement of the battery box in the opposite direction to the first direction.

9. The conveying device according to claim 1, characterized in that: The transport device further comprises a carrying platform, and the carrying platform is used for carrying the main frame.

10. A loading and unloading auxiliary device, characterized in that: A conveying device comprising any one of claims 1 to 9.

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