Cart

Abstract

The utility model relates to a cart which comprises a cart body, a lifting mechanism and a conveying device. The cart body is used for bearing the lifting mechanism. The lifting mechanism is connected with the cart body and used for adjusting the height of the bearing platform. The lifting mechanisms are connected with one another; the conveying device is arranged on the bearing platform and used for conveying the battery box to be conveyed in the first direction. Wherein a counterweight assembly is arranged on the bearing platform, and the weight of the counterweight assembly is adjustable. The whole weight can be kept balanced in the conveying process of the battery box, a good balancing effect is achieved, accidents such as inclination and rollover of the cart body are avoided, and the safety of loading and unloading of the battery box is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery assembly, and particularly to a trolley. Background Art

[0002] With the wide application of new energy vehicles, the development of energy storage technology has become the key to promoting the progress of electric vehicles. However, with the continuous pursuit of the safety performance, efficiency and reliability of energy storage technology, the energy density of the battery box assembled in the large container-type energy storage system is getting higher and higher, and the weight of the battery box is also getting larger and larger. And the large container-type energy storage system is usually equipped with a large battery rack. Therefore, when assembling the heavy battery box, the installation difficulty is great, and installation accidents are likely to occur.

[0003] In the traditional technology, usually a carrier is used to lift the battery box to the height to be installed, and then the battery box is manually pushed into the battery rack to complete the installation. After the battery box is lifted to a certain height, the carrier is prone to tilt due to the offset of the center of gravity of the battery box. Especially during the process of pushing the battery box into the battery rack, when the battery box is at the edge position, it is more likely to cause rollover. Summary of the Utility Model

[0004] Based on this, in view of the problems of low battery box assembly efficiency and poor assembly balance, it is necessary to provide a trolley.

[0005] A trolley for transporting a battery box, comprising:

[0006] A trolley main body for carrying a lifting mechanism;

[0007] A lifting mechanism connected to the trolley main body for adjusting the height of a bearing platform;

[0008] A bearing platform connected to the lifting mechanism; and

[0009] A transporting device arranged on the bearing platform for transporting the battery box to be transported along a first direction;

[0010] Wherein, a counterweight assembly is arranged on the bearing platform, and the weight of the counterweight assembly is adjustable.

[0011] In one embodiment, the height difference between the center of gravity of the counterweight assembly and the center of gravity of the battery box in the vertical direction is within a preset range.

[0012] In one embodiment, the counterweight assembly is detachably arranged on the bearing platform. The counterweight assembly includes one or more counterweight blocks, and the center of the counterweight assembly is adjusted by adjusting the number of the counterweight blocks.

[0013] In one embodiment, the bearing platform includes a protruding portion that protrudes from the trolley main body in the horizontal direction.

[0014] In one embodiment, the lifting mechanism includes:

[0015] A support member having one end connected to the cart body and the other end connected to the carrying platform; and

[0016] A driving member connected to the support member for driving the support member to adjust the lifting of the carrying platform.

[0017] In one embodiment, the support member includes a first support frame and a second support frame, and the first support frame and the second support frame are rotatably connected through a connection point; the driving member can drive the first support frame and the second support frame to rotate around the connection point.

[0018] In one embodiment, the first end of the first support frame is rotatably connected to the cart body, and the second end of the first support frame is connected to a first moving member; the first moving member abuts against the carrying platform and reciprocates on the second surface of the carrying platform;

[0019] The first end of the second support frame is rotatably connected to the carrying platform, and the second end of the second support frame is connected to a second moving member; the second moving member abuts against the cart body and reciprocates on the cart body.

[0020] In one embodiment, the first end of the driving member is connected to a first rotating shaft, and the second end of the driving member is connected to a cross bar.

[0021] In one embodiment, the conveying device is arranged on the first surface of the carrying platform, and the end of the conveying device along the first direction is aligned with the end of the carrying platform along the first direction.

[0022] In one embodiment, the cart body includes a fixed frame, and the fixed frame includes:

[0023] A fixing member connected to the first end of the first support frame through a rotating shaft; and

[0024] A sliding rail connected to the second moving member for restricting the movement of the second moving member on the cart body.

[0025] For the above-mentioned cart, the lifting mechanism is supported by the cart body, and the height of the carrying platform is adjusted by the lifting mechanism, so that the battery box can be lifted to the required high position and inserted into the battery rack through the conveying device, improving the flexibility of the battery box transportation; a counterweight assembly is arranged on the carrying platform, and the height difference between the center of gravity of the battery box and the center of gravity of the counterweight assembly is adjusted within a preset range, which can keep the overall weight balanced during the transportation of the battery box, play a good balancing role, avoid accidents such as tilting and overturning of the cart body, and ensure the safety of the battery box loading and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of a cart in one embodiment of the utility model;

[0028] Figure 2 This is a structural schematic diagram of a carrying platform in an embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of the structure of a cart in one embodiment of the utility model;

[0030] Figure 4 It is a schematic structural diagram of a cart in another embodiment of the utility model.

[0031] The reference numerals in the specific implementation manner are as follows:

[0032] 10. Cart body, 20. Lifting mechanism, 30. Load-bearing platform, 40. Transport device, 50. Battery box, 102. Frame, 202. Support member, 204. Driving member, 206. First support frame, 208. Second support frame, 302. Counterweight assembly, 304. Protrusion, 402. Main frame, 404. Rolling member, 406. Limiting member, 408. Blocking rod, 502. Battery rack, 504. Battery tray. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0040] Refer to Figure 1 , Figure 1 FIG. shows a schematic structural diagram of a trolley in an embodiment of the present invention. The trolley provided in an embodiment of the present invention is used to transport a battery box, and includes a trolley main body 10, a lifting mechanism 20, a carrying platform 30 and a transporting device 40. The trolley main body 10 is used to carry the lifting mechanism 20; the lifting mechanism 20 is connected to the trolley main body 10 and is used to adjust the height of the carrying platform 30; the carrying platform 30 is connected to the lifting mechanism 20; the transporting device 40 is disposed on the carrying platform and is used to transport the battery box to be transported in a first direction; wherein, a counterweight assembly is disposed on the carrying platform, and the weight of the counterweight assembly is adjustable.

[0041] Specifically, the first end of the lifting mechanism is connected to a fixing member on the trolley main body, and the second end of the lifting mechanism 20 is connected to the carrying platform 30, and the height of the carrying platform 30 is adjusted by the lifting mechanism; a counterweight assembly and a transporting device 40 are disposed on the carrying platform 30. Exemplarily, a counterweight assembly is disposed at the first end of the carrying platform 30, and a transporting device 40 is disposed at the second end of the carrying platform 30. The transporting device 40 carries the battery box 50 and transports the battery box 50 in a direction away from or towards the counterweight assembly.

[0042] In this embodiment, the lifting mechanism 20 is supported by the trolley main body 10, and the height of the carrying platform 30 is adjusted by the lifting mechanism 20, so that the battery box can be lifted to the required high position and inserted into the battery rack 502 through the transporting device 40, improving the flexibility of transporting the battery box; disposing a counterweight assembly on the carrying platform 30 can keep the overall weight of the trolley balanced during the transportation of the battery box, playing a good balancing role, avoiding accidents such as tilting and overturning of the trolley main body 10, and ensuring the safety of loading and unloading the battery box.

[0043] Please refer to Figure 2 , Figure 2 FIG. shows a schematic structural diagram of the carrying platform 30 in an embodiment of the present invention. In some embodiments, the height difference between the center of gravity of the counterweight assembly and the center of gravity of the battery box in the vertical direction is within a preset range.

[0044] Exemplarily, the center of gravity of the counterweight assembly 302 is on the same horizontal plane as the center of gravity of the battery box 50. The counterweight assembly is detachably disposed on the carrying platform 30. The counterweight assembly 302 includes one or more counterweight blocks. The center of the counterweight assembly is adjusted by adjusting the number of counterweight blocks. The counterweight assembly and the battery box 50 are arranged in a matching manner on the carrying platform 30.

[0045] Optionally, the center of gravity of the counterweight assembly and the center of gravity of the battery box 50 are both on the central axis of the carrying platform 30, and the height difference between the center of gravity of the counterweight assembly and the center of gravity of the battery box 50 in the vertical direction is within a preset range. The preset range of the height difference is affected by the weights of the counterweight assembly and the battery box 50.

[0046] Exemplarily, the center of gravity of the counterweight assembly is 5 cm or less higher than the center of gravity of the battery box 50, or the center of gravity of the counterweight assembly is 10 cm or less lower than the center of gravity of the battery box 50.

[0047] One end of the conveying device 40 is aligned with the edge of the second end of the carrying platform 30, and the width of the conveying device 40 is smaller than the width of the carrying platform 30. The conveying device 40 is adjacent to the counterweight assembly and there is a spacing between them. The counterweight assembly 302 includes a plurality of counterweight blocks. The counterweight assembly is detachably installed on the carrying platform 30, and the edge of the counterweight assembly is aligned with the edge of the first end of the carrying platform 30. Optionally, the counterweight assembly is connected to the carrying platform 30 by threaded connection, bolt connection, pin connection, plug connection, snap connection or clamping connection, or the counterweight assembly can be directly placed on the carrying platform 30. The counterweight assembly is selected and placed according to the weight of the battery box and the center of gravity of the battery box, so that the center of gravity of the counterweight assembly and the center of gravity of the battery box are on the same horizontal plane. The weight of the counterweight assembly can be equal to the weight of the battery box, or slightly greater or slightly less, and the weight difference is kept within 5%.

[0048] In this embodiment, by selecting the weight and number of the counterweight blocks in the counterweight assembly according to the center of gravity and weight of the battery box, it is possible to avoid the trolley from tilting or overturning, resulting in damage to the battery box; and the height difference between the center of gravity of the counterweight assembly and the center of gravity of the battery box in the vertical direction is within a preset range, ensuring that when the battery box is transported on the conveying device, the balance of the trolley can also be ensured under dynamic conditions, playing a good balancing role and ensuring the safety and stability of the transportation of the battery box.

[0049] Please refer to Figure 3 , Figure 3The schematic diagram of the structure of the cart in another embodiment of the utility model is shown. In some embodiments, the lifting mechanism 20 includes a support member 202 and a driving member 204. One end of the support member 202 is connected to the cart body 10, and the other end of the support member is connected to the load-bearing platform 30. The driving member 204 is connected to the support member 202 and is used to drive the support member 202 to adjust the lifting of the load-bearing platform. The support member 202 includes a first support frame 206 and a second support frame 208. The first support frame 206 and the second support frame 208 are rotatably connected through a connection point, and the driving member can drive the first support frame and the second support frame to rotate around the connection point. The cart body is fixed to a frame, and the fixed frame includes a fixing member and a slide rail. The first end of the first support frame 206 is connected to the fixed part on the cart body 10, and the first support frame 206 and the fixed part are both provided with through holes, and the first rotating shaft passes through the fixed part, the first support frame 206, the first support frame 206 and the fixed part in sequence and is fixed; the second end of the first support frame 206 is connected to the first moving part, the first moving part abuts against the bearing platform 30, and reciprocates on the second surface of the bearing platform 30; the first end of the second support frame 208 is connected to the bearing platform 30, and the second surface of the bearing platform 30 is provided with a fixed part, and the second support frame 208 and the fixed part are both provided with through holes, and the second rotating shaft passes through the fixed part, the second support frame 208, the second support frame 208 and the fixed part in sequence and is fixed; the second end of the second support frame 208 is connected to the second moving part, the second moving part abuts against the cart body 10, and reciprocates on the cart body 10. Among them, the first moving part and the second moving part can be pulleys, sliders, gears or connecting rods, etc. The slide rail on the fixed frame is connected to the second movable component and is used to limit the movement track of the second movable component on the cart body.

[0050] Preferably, the connection point between the first support frame and the second support frame is located at the midpoint of the first support frame and the second support frame, so that the support member is symmetrical about the center of the connection point.

[0051] Exemplarily, the first moving part and the second moving part are sliders. When the lifting mechanism 20 needs to raise the carrying platform 30, the included angle between the first support frame 206 and the second support frame 208 in the vertical direction becomes smaller, and the distance between the first end of the first support frame 206 and the second end of the second support frame 208 becomes smaller. That is, the second support frame 208 approaches the fixing part on the cart body 10 through the second moving part, and the first support frame 206 approaches the fixing part on the carrying platform 30 through the first moving part; the first moving part and the second moving part move in the sliding grooves on the main body frame and the carrying platform 30 to complete the action of raising the carrying platform 30. On the contrary, when it is necessary to lower the carrying platform 30, the included angle between the first support frame 206 and the second support frame 208 in the vertical direction becomes larger, and the distance between the first end of the first support frame 206 and the second end of the second support frame 208 becomes larger. That is, the second support frame 208 moves away from the fixing part on the cart body 10 through the second moving part, and the first support frame 206 moves away from the fixing part on the carrying platform 30 through the first moving part; the first moving part and the second moving part move in the sliding grooves on the main body frame and the carrying platform 30 to complete the action of lowering the carrying platform 30.

[0052] In this embodiment, the first support frame and the second support frame are rotatably connected through a connection point, which increases the overall stability of the cart, can effectively distribute the weights of the shooting component and the battery box, further improves the stability of the battery box and the counterweight component, and avoids tipping due to unstable center of gravity. During the process of raising the carrying platform, the connection point of the first support frame and the second support frame will move obliquely upward as it rises, which will cause the center of gravity of the cart to shift. The transporting component transports the battery box to balance the center of gravity shift of the support member, so that the center of gravity of the cart is on the central plane, which can improve the overall stability.

[0053] Please continue to refer to Figure 3 , the first end of the driving member 204 is connected to the first rotating shaft, and the second end of the driving member 204 is connected to the cross bar. Among them, the cross bar is a connecting rod fixed on the first support frame 206, and the cross bar is located between the third rotating shaft and the second rotating shaft; the cross bar can also be arranged on the first support frame 206 and located between the first rotating shaft and the second rotating shaft. Exemplarily, when the driving member 204 drives the support member 202 to raise or lower the carrying platform 30, the first end of the driving member 204 applies torque to the first rotating shaft, so that the included angle between the driving member 204 and the horizontal plane increases or decreases. The second end of the driving member 204 is connected to the cross bar, and the driving member 204 can rotate at the connection point, and at the same time, the driving member 204 extends or contracts to realize the raising or lowering of the carrying platform 30.

[0054] Preferably, the first end of the driving member 204 is connected to the midpoint of the first rotating shaft, and the second end of the driving member 204 is rotatably connected to the midpoint of the cross bar, which can maintain the overall balance of the cart during the process of driving the carrying platform to rise and fall.

[0055] In this embodiment, the driving member 204 is rotationally connected to the cross bar by being connected to the first rotating shaft, so as to raise or lower the carrying platform 30. The connection between the first rotating shaft and the cross bar can ensure that when the driving member 204 applies torque, the rotational and telescopic motions can be effectively transmitted to the cross bar and the carrying platform 30, and the overall structure stability of the trolley can be maintained, avoiding the overall center of gravity of the trolley shifting during driving, and further causing safety accidents such as tipping.

[0056] Please refer to Figure 4 , Figure 4 which shows a schematic structural diagram of the trolley in another embodiment of the present utility model. In some embodiments, the carrying platform 30 includes a protruding portion 304 that protrudes from the trolley main body 10 in the horizontal direction. The conveying device 40 is arranged on the first surface of the carrying platform 30, and the first end of the conveying device 40 is aligned with the first end of the carrying platform 30. The conveying device 40 and the battery box are transported to the battery rack 502 by the trolley main body 10. The battery rack 502 includes multiple layers of battery trays 504. A protruding portion 304 is arranged on the carrying platform 30, so that the protruding portion 304 protrudes from the trolley main body 10 in the horizontal direction. The protruding portion 304 can abut against the edge or the upper part of the battery tray 504 on the battery rack 502. The battery box can be inserted from the tooling onto the battery tray 504 through the conveying device 40, and then the height of the carrying platform 30 is adjusted by the lifting mechanism 20, so that multiple battery boxes on the conveying device 40 can be respectively inserted into different battery trays 504.

[0057] In this embodiment, the protruding portion 304 can abut against the battery rack 502, so that the conveying device 40 can conveniently push the battery box onto the battery tray 504 of the battery rack 502; it solves the problem that there is a stepped carrying platform 30 in the battery rack 502 or the energy storage container, resulting in the trolley being unable to lean against the edge of the battery tray 504, and increases the flexibility and application range of transporting the battery box.

[0058] Please refer to Figure 2 and Figure 4, in some embodiments, the conveying device 40 includes a main frame 402, rolling members 404, and a limiting member 406. The first surface of the battery box is in rolling contact with the rolling members 404; as the rolling members 404 roll, the conveying device 40 conveys the battery box along a first direction; the limiting member 406 is connected to the rolling members 404 in a plug-in manner, and the movement of the battery box in the first direction is restricted by the limiting member 406; the rolling members 404 are rotatably connected to the main frame 402, and multiple rolling members 404 are arranged at equal intervals on the same horizontal plane. Optionally, the limiting member 406 is connected to the rolling members 404 in a detachable and plug-in manner. The limiting member 406 includes an operating portion and a plugging portion. The plugging portion includes a vertical portion and an arc portion. The distance between the first vertical portion and the second vertical portion is slightly larger than the diameter of the rolling member 404 and can be freely plugged onto the rolling member 404; the arc portion is in full contact with the arc of the upper half of the rolling member 404, that is, the U-shaped opening formed by the arc portion and the vertical portion can be in full contact and connection with the rolling member 404.

[0059] Exemplarily, a corresponding counterweight block is selected according to the weight of the battery box to be assembled to form a counterweight assembly; the battery box is assembled onto the rolling member 404, and the limiting member 406 is arranged on the rolling members 404 at both ends of the battery box for limiting. Multiple battery boxes are sequentially assembled onto the rolling member 404 and limited by the limiting member 406. By moving the trolley, the trolley is moved to a predetermined position (such as the battery rack 502), and the driving member 204 in the lifting mechanism 20 adjusts the carrying platform 30 to the height of the battery tray 504 where the battery box needs to be inserted, and the protruding portion 304 of the carrying platform 30 abuts against the battery tray 504 on the battery rack 502, so that the conveying device 40 is flush with or slightly higher than the battery tray 504. The first limiting member 406 is separated from the rolling member 404 through the operating portion of the first limiting member 406, and the battery box is pushed into the battery tray 504; again according to requirements, the driving member in the lifting mechanism 20 is used to adjust the carrying platform 30 to the height where the battery box needs to be inserted, and the second limiting member 406 is separated from the rolling member 404, and the battery box is pushed into the corresponding battery tray 504. Similarly, the trolley can also be taken out from the battery tray 504, a limiting member 406 or a blocking rod is installed at one end of the conveying device 40 close to the counterweight assembly, the trolley is moved to the battery rack 502 by moving the trolley, and the driving member 204 in the lifting mechanism 20 adjusts the carrying platform 30 to the height of the battery tray 504 where the battery box needs to be taken out, and the protruding portion 304 of the carrying platform 30 abuts against the battery tray 504 on the battery rack 502, so that the conveying device 40 is flush with or slightly lower than the battery tray 504. The battery box is taken out and placed on the conveying device 40, and the battery box moves in the direction close to the counterweight assembly until it abuts against the limiting member 406 or the blocking rod, and a limiting member 406 is arranged at one end of the battery box away from the counterweight assembly; again according to requirements, the driving member in the lifting mechanism 20 is used to adjust the carrying platform 30 to the required height; the battery box is taken out and placed on the conveying device 40, and the battery box moves in the direction close to the counterweight assembly until it abuts against the limiting member 406, and a limiting member 406 is arranged at one end of the battery box away from the counterweight assembly.

[0060] In this embodiment, through the cooperation of the conveying assembly and the lifting mechanism 20, the position of the battery box can be accurately controlled, and the assembly and removal of the battery box can be completed quickly and accurately; through the protruding portion 304 of the carrying platform 30, the problem that there are steps in the battery rack 502 or the energy storage container and the trolley cannot directly abut against the edge of the battery tray 504 can be well solved; the conveying device 40 can prevent the battery boxes from interfering and colliding with each other, and can ensure that the battery boxes can accurately reach the expected position.

[0061] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0062] The above-described embodiments merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A cart for transporting battery boxes, characterized in that: The cart comprises: The trolley body is used to carry the lifting mechanism; A lifting mechanism connected to the cart body and used to adjust the height of the carrying platform; A carrying platform connected to the lifting mechanism; and A transport device, disposed on the carrying platform, for transporting the battery box to be transported along a first direction; Wherein, a counterweight assembly is arranged on the bearing platform, and the weight of the counterweight assembly is adjustable.

2. The cart according to claim 1, characterized in that: The height difference between the center of gravity of the counterweight assembly and the center of gravity of the battery box in the vertical direction is within a preset range.

3. The cart according to claim 1, characterized in that: The counterweight assembly is detachably arranged on the bearing platform. The counterweight assembly includes one or more counterweight blocks. The center of the counterweight assembly is adjusted by adjusting the number of the counterweight blocks.

4. The cart according to claim 1, characterized in that: The carrying platform includes a protruding portion, and the protruding portion protrudes from the cart body in a horizontal direction.

5. The cart according to claim 1, characterized in that: The lifting mechanism comprises: A support member, one end of which is connected to the cart body and the other end of which is connected to the carrying platform; and A driving member is connected to the supporting member and is used to drive the supporting member to adjust the lifting of the carrying platform.

6. The cart according to claim 5, characterized in that: The support member includes a first support frame and a second support frame, and the first support frame and the second support frame are rotatably connected through a connection point; the driving member can drive the first support frame and the second support frame to rotate around the connection point.

7. The cart according to claim 6, characterized in that: The first end of the first support frame is rotatably connected to the cart body, and the second end of the first support frame is connected to the first moving component; the first moving component abuts against the bearing platform and reciprocates on the second surface of the bearing platform; The first end of the second support frame is rotatably connected to the bearing platform, and the second end of the second support frame is connected to the second moving component; the second moving component abuts against the trolley body and performs reciprocating motion on the trolley body.

8. The cart according to claim 5, characterized in that: The first end of the driving member is connected to the first rotating shaft, and the second end of the driving member is connected to the cross bar.

9. The cart according to claim 1, characterized in that: The conveying device is disposed on the first surface of the carrying platform, and an end of the conveying device along the first direction is aligned with an end of the carrying platform along the first direction.

10. The cart according to claim 6, characterized in that: The cart body includes a fixed frame, and the fixed frame includes: A fixing member connected to the first end of the first support frame via a rotating shaft; and The slide rail is connected to the second movable component and is used to limit the movement of the second movable component on the cart body.

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