Conveying equipment and string welding system

Abstract

The present invention discloses a conveying device and a string welding system. The conveying device includes a conveying main body device and a guide device; the conveying main body device includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to operate. The first end of the conveyor belt is configured to be able to stepwise extend in a direction away from the second end and to stepwise return in a direction toward the second end, wherein each time the conveyor belt steps a predetermined length in the direction away from the second end, the conveyor belt flips upward by a predetermined length at the first end, so that the upper surface of the conveyor belt of the predetermined length forms an empty loading station, and the battery cells and welding ribbons are stacked at the loading station; the guide device includes a guide main body for guiding the welding ribbon, the guide main body is arranged at the first end of the conveyor belt and can move synchronously with the conveyor belt at the first end. The technical solution provided by the present invention can guide the welding ribbon when it is stacked with the battery cells, ensure that the welding ribbon is accurately placed corresponding to the main grid line of the battery cell, and improve the production quality of the battery string.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell self-production, and in particular to a conveying device and a string welding system. Background Art

[0002] During the production process of photovoltaic cell string components, the welding ribbons and cells need to be stacked and welded to form a cell string.

[0003] The feeding of solder ribbon is a crucial step, as its accuracy determines the quality of the components produced by the stringer. Inaccurate solder ribbon feeding can cause the ribbon to deviate from the main busbars of the cell when the cell and ribbon are overlapped, resulting in white spots and other problems.

[0004] In order to achieve accurate feeding of the solder ribbon, a conveying device is needed to enable the solder ribbon to be accurately stacked with the battery cells, thereby improving the production quality of the battery string. Summary of the Invention

[0005] The purpose of the present invention is to provide a conveying device and a string welding system to solve the problem in the prior art that the welding ribbon and the battery cell deviate from the main grid line of the battery cell when they are stacked.

[0006] In order to achieve the above object, the present invention provides a conveying device, which includes a conveying main body device and a guide device;

[0007] The conveying main body device includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to operate, wherein the first end of the conveyor belt is configured to be able to stepwise extend in a direction away from the second end and to stepwise return in a direction toward the second end, wherein each time the conveyor belt steps a predetermined length in the direction away from the second end, the conveyor belt flips upward at the first end by a preset length, so that the upper surface of the conveyor belt of the predetermined length forms an empty loading station, and the battery cells and welding ribbons are stacked on the loading station;

[0008] The guiding device includes a guiding body for guiding the welding strip. The guiding body is arranged at the first end of the conveyor belt and can move synchronously with the conveyor belt at the first end.

[0009] Preferably, the main conveying device further includes a base, a fixed platform, a stepping platform and a platform moving mechanism for driving the stepping platform to move, wherein:

[0010] The fixed platform is fixedly connected to the base, the stepping platform is slidably connected to the base, and the platform moving mechanism is capable of driving the stepping platform to move stepwise toward or away from the fixed platform in the conveying direction of the conveyor belt;

[0011] The conveyor belt is arranged on the fixed platform and the stepping platform. When the stepping platform moves away from the fixed platform, the conveyor belt flips from bottom to top at the end of the stepping platform away from the fixed platform, so that the upper surface of the conveyor belt extends step by step along the stepping platform in a direction away from the fixed platform.

[0012] The guide body is configured to move synchronously with the stepping platform.

[0013] Preferably, the guide body is fixedly mounted on the stepping platform, and the stepping platform and the guide body are driven to move synchronously by the platform moving mechanism;

[0014] Alternatively, the guide device further includes a guide moving mechanism, and the guide body is driven by the guide moving mechanism and the stepping platform is driven by the platform moving mechanism to move synchronously.

[0015] Preferably, the platform moving mechanism includes a motor and a lead screw driven by the motor, and the stepping platform is mounted on a nut matched with the lead screw.

[0016] Preferably, the guide body is driven by the guide movement mechanism, the guide movement mechanism includes a motor and a lead screw driven by the motor, and the guide body is mounted on a nut that cooperates with the lead screw.

[0017] Preferably, the conveyor belt driving mechanism includes an active roller, a first guide roller, a second guide roller and a tensioning roller; the active roller is arranged at an end of the fixed platform away from the stepping platform, the first guide roller is located at the end of the stepping platform away from the fixed platform, and the first guide roller and the second guide roller are installed on the stepping platform, the tensioning roller is located below the first guide roller and the second guide roller, and the tensioning roller is configured to be able to move back and forth and adjust along the conveying direction of the conveyor belt to tension the conveyor belt; the conveyor belt is sequentially wound around the active roller, the first guide roller, the second guide roller and the tensioning roller, wherein the second guide roller is located on the transmission surface of the conveyor belt; when the stepping platform moves away from the fixed platform, the first guide roller and the second guide roller guide the conveyor belt to flip and extend upward from below;

[0018] or,

[0019] The conveyor belt driving mechanism includes an active roller, a guide roller, a tensioning roller and a rotating bracket, wherein: the active roller is arranged at an end portion of the fixed platform away from the stepping platform, the first end of the rotating bracket is rotatably connected to the base, the second end of the rotating bracket is located above the first end and extends outward from the end portion of the stepping platform away from the fixed platform, the tensioning roller is connected to the second end of the rotating bracket, and the guide roller is installed on the base and is located below the tensioning roller; the conveyor belt is wound around the active roller, the tensioning roller and the guide roller in sequence; in the process of the stepping platform stepping away from the fixed platform, the rotating bracket is configured to rotate toward the stepping platform, and the part of the conveyor belt that steps and extends on the stepping platform is the part of the conveyor belt released by the rotating bracket through rotation; in the process of the stepping platform stepping toward the fixed platform, the rotating bracket is configured to rotate away from the stepping platform.

[0020] Preferably, the guide body comprises a guide plate with a guide groove provided on the upper surface, and the extending direction of the guide groove is consistent with the conveying direction of the conveyor belt.

[0021] Preferably, the guide body further comprises a plurality of clamping claws for clamping the welding strips, which are arranged at one end of the guide plate close to the conveyor belt, and each of the clamping claws is arranged corresponding to one of the guide grooves.

[0022] Preferably, the guide device further includes a lifting mechanism for driving the guide body to rise and fall.

[0023] According to another aspect of the present invention, a string welding system is further provided, comprising a welding ribbon pulling device, a battery cell transport device, a pressing tool, a welding device, and the conveying equipment as described above;

[0024] The welding tape pulling device pulls the welding tape and lays it on the loading station of the conveyor belt. During the pulling process of the welding tape, the guide device of the conveyor device guides the welding tape.

[0025] The cell transport device lays the cells toward the loading station, the cells are stacked on the rear section of the soldering ribbon at the loading station, and the pressing device presses on the front section of the soldering ribbon;

[0026] The conveyor belt advances a predetermined length each time in a direction away from the second end, the welding ribbon pulling device lays a group of welding ribbons toward the loading station, and the battery cell transporting device stacks a battery cell at the loading station. After a predetermined number of the battery cells and welding ribbons are placed on the conveyor belt, the conveyor belt transports the stacked battery cells and welding ribbons toward the second end to the welding station.

[0027] The welding device is located at a welding station and is used to weld the battery cell and the welding ribbon transported to the welding station.

[0028] In the technical solution provided by the present invention, the soldering strips can be guided when they are provided, so that each soldering strip can be accurately stacked corresponding to the position of the main grid line of the battery cell, thereby greatly improving the production quality of the battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a conveying device according to one embodiment of the present invention;

[0030] Figure 2 for Figure 1 A partially enlarged schematic diagram;

[0031] Figure 3 This is a schematic structural diagram of the main conveying device in the first embodiment of the present invention;

[0032] Figure 4 This is a schematic structural diagram of the main conveying device in the second embodiment of the present invention;

[0033] Figure 5 This is a schematic structural diagram of a conveying main body device in a third embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the structure of the conveying main device in the fourth embodiment of the present invention.

[0035] Description of Reference Numerals

[0036] 1- conveying main unit; 11- conveyor belt; 12- base; 13- stepping platform; 131- mounting bracket; 14- fixed platform; 15- conveyor belt driving mechanism; 151- driving roller; 152- first guide roller; 153- second guide roller; 154- tensioning roller; 155- rotating bracket; 156- tensioning roller; 157- guide roller; 16- driving roller; 17- driven roller; 2- guide device; 21- guide plate; 211- guide groove; 22- chuck. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.

[0038] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, well-known structures, methods, devices, implementations, materials or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0039] For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" may be used herein to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientation shown in the figures, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, an element described as being "below" another element or feature will be positioned "above" the other element or feature. Thus, the exemplary term "lower" can include both upper and lower orientations. The device can also be positioned in other ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein can be interpreted accordingly.

[0040] The present invention provides a conveying device, such as Figure 1 and Figure 2 As shown, the conveying device includes a conveying main device 1 and a guide device 2;

[0041] The conveying main body device 1 includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to operate. The first end of the conveyor belt is configured to be able to stepwise extend in a direction away from the second end and to stepwise return in a direction toward the second end. Each time the conveyor belt steps a predetermined length in a direction away from the second end, the conveyor belt flips upward at the first end by a predetermined length, so that the upper surface of the conveyor belt of the predetermined length forms an empty loading station, and the battery cells and welding ribbons are stacked on the loading station.

[0042] The guiding device 2 includes a guiding body for guiding the welding strip. The guiding body is arranged at the first end of the conveyor belt and can move synchronously with the conveyor belt at the first end.

[0043] The conveying device provided by the present invention is used for stacking welding strips and battery cells in sequence to form a battery string. Specifically, the conveyor belt of the conveying main body device 1 extends once in each step toward the first end, and an empty loading station is formed on the portion where the conveyor belt is stepped and extended. The battery cells and welding strips can be stacked on the loading station. In this way, in the process of loading the battery cells and welding strips, it is not necessary to step the conveyor belt toward the welding station once each time the battery cells and welding strips are loaded. After a predetermined number of battery cell stacking assemblies are loaded, they are transported together to the welding station for welding. This ensures the heating consistency of each battery cell and helps improve the welding quality. In the process of stepping the conveyor belt, the guide body of the guide device 2 moves synchronously with the first end of the conveyor belt. In this way, when the welding strips are provided to the loading station, the guide device 2 can guide the welding strips so that each welding strip can be accurately stacked corresponding to the main grid line position of the battery cell, which can greatly improve the production quality of the battery string.

[0044] In a specific embodiment of the present invention, Figure 1 and Figure 2 As shown, the guide body of the guide device 2 includes a guide plate 21 with a guide groove 211 provided on the upper surface. The extending direction of the guide groove 211 is consistent with the conveying direction of the conveyor belt.

[0045] The guide body 21 further includes a plurality of clamping claws 22 for clamping the welding strips, which are provided at one end of the guide plate 21 close to the conveyor belt. Each of the clamping claws 22 is provided corresponding to one of the guide grooves 211 .

[0046] When supplying the solder ribbon to the loading station of the conveyor belt, the solder ribbon pulling device clamps the head position of the solder ribbon and pulls a group of solder ribbons toward the loading station of the conveyor belt. During this process, the solder ribbons are guided by the guide groove 211. When the solder ribbon moves to the predetermined position, the clamp 22 of the guide device 2 clamps the tail of the solder ribbon. Then, the transport device transports the battery cell and the pressing tool. The pressing tool is placed on the front section of the solder ribbon (i.e., the section near the head position clamped by the solder ribbon pulling device). After pressing the front section of the solder ribbon, the solder ribbon pulling device releases the head of the solder ribbon. The battery cell is placed on the rear section of the solder ribbon. After pressing the rear section of the solder ribbon, the clamp 22 releases the tail of the solder ribbon. Of course, the solder ribbon pulling device and the clamp 22 can also release the solder ribbon simultaneously after the clamping tool has pressed the front section of the solder ribbon and the battery cell has pressed the rear section of the solder ribbon.

[0047] In this embodiment, the guide device 2 also includes a lifting mechanism for driving the guide body to rise and fall. When transporting battery cells to the loading station, the guide body can be driven to descend a preset distance by the lifting mechanism. The height of the uppermost surface of the guide body of the guide device 2 (the uppermost surface of the guide plate 21 and the clamp 22) is consistent with the height of the lower surface of the battery cell placed on the loading station, or is lower than the height of the lower surface of the battery cell, so as to avoid the portion of the battery cell extending from the conveyor belt interfering with the guide device 2 when the battery cell is laid on the loading station, thereby causing damage to the battery cell. Preferably, when placing the battery cell, it is preferably set to descend until the height of the uppermost surface of the guide body is consistent with the height of the lower surface of the battery cell, so that when the battery cell is placed on the loading station, the portion of the battery cell extending from the end of the conveyor belt can be supported by the guide body.

[0048] In the technical solution provided by the present invention, in order to enable the first end of the conveyor belt of the conveying main device 1 to be extended in steps, there are multiple implementation methods:

[0049] In the first embodiment, as Figure 3 As shown, the conveying main body device 1 includes a conveyor belt 11, a base 12, a fixed platform 14, a stepping platform 13 and a platform moving mechanism for driving the stepping platform 13 to move, wherein:

[0050] The fixed platform 14 is fixedly connected to the base 12, and the stepping platform 13 is slidably connected to the base 12. The platform moving mechanism can drive the stepping platform 13 to move stepwise toward or away from the fixed platform 14 in the conveying direction of the conveyor belt;

[0051] The conveyor belt 11 is arranged on the fixed platform 14 and the stepping platform 13. When the stepping platform 13 moves away from the fixed platform 14, the conveyor belt 11 flips from bottom to top at the end of the stepping platform 13 away from the fixed platform 14, so that the upper surface of the conveyor belt 11 extends step by step along the stepping platform 13 in a direction away from the fixed platform 14.

[0052] The guide body of the guide device 2 is configured to move synchronously with the stepping platform 13 .

[0053] In this embodiment, the conveyor belt driving mechanism 15 that drives the conveyor belt 11 includes a driving roller 151, a first guide roller 152, a second guide roller 153 and a tensioning roller 154;

[0054] The driving roller 151 is arranged at the end of the fixed platform 14 away from the stepping platform 13 and is driven to rotate by a driving motor. The first guide roller 152 is located at the end of the stepping platform 13 away from the fixed platform 14, and the first guide roller 152 and the second guide roller 153 are installed on the stepping platform 13. The tensioning roller 154 is located below the first guide roller 152 and the second guide roller 153. The tensioning roller 154 is configured to be able to move back and forth along the conveying direction of the conveyor belt 11 to thereby tension the conveyor belt 11. Specifically, a slide rail extending along the conveying direction of the conveyor belt 11 can be provided on the base 12, and the tensioning roller 154 moves back and forth along the slide rail under the drive of the tensioning roller driving cylinder; the conveyor belt 11 is sequentially wound around the driving roller 151, the first guide roller 152, the second guide roller 153 and the tensioning roller 15, wherein the second guide roller 153 is located on the transmission surface of the conveyor belt 11;

[0055] When the stepping platform 13 moves away from the fixed platform 14 , the first guide roller 152 and the second guide roller 153 move along with the stepping platform 13 and guide the conveyor belt 11 from below to turn over and extend upward.

[0056] In this embodiment, the platform moving mechanism for driving the stepping platform 13 to move may include a motor and a lead screw driven by the motor, and the stepping platform 13 is mounted on a nut matched with the lead screw.

[0057] When the platform moving mechanism drives the stepping platform 13 to move away from the fixed platform 14, the stepping platform 13 moves synchronously with the first guide roller 152 and the second guide roller 153 installed thereon, and the conveyor belt 11 flips from bottom to top along the first guide roller 152 and the second guide roller 153 as the part that steps and extends on the stepping platform 13.

[0058] In this embodiment, the guide body of the guide device 2 is fixedly mounted on the stepping platform 13, and the stepping platform 13 and the guide body are driven by the platform moving mechanism to move synchronously.

[0059] It is understood that the guide device may further include a guide movement mechanism, wherein the guide body and the stepping platform 13 are driven by the guide movement mechanism to move synchronously. That is, the guide body and the stepping platform 13 of the guide device 2 are driven independently.

[0060] Wherein, the guide movement mechanism includes a motor and a lead screw driven by the motor, and the guide body is installed on a nut matched with the lead screw.

[0061] In the second embodiment, the structure of the transport main device 1 is as follows Figure 4As shown, the structure and working principle of the conveying main device 1 in this embodiment are basically the same as those of the first embodiment mentioned above, and also include a conveyor belt 11, a base 12, a fixed platform 14, a stepping platform 13 and a conveyor belt driving mechanism 15. The conveyor belt driving mechanism 15 includes an active roller 151, a first guide roller 152, a second guide roller 153 and a tensioning roller 154. The conveyor belt 11 is wound around the active roller 151, the first guide roller 152, the second guide roller 153 and the tensioning roller 15 in sequence, wherein the second guide roller 153 is located on the transmission surface of the conveyor belt 11.

[0062] Different from the first embodiment, the conveying main device 1 in this embodiment also includes a mounting bracket 131, the first end of the mounting bracket 131 is connected to the bottom of the stepping platform 13, and the second end of the mounting bracket 131 extends outward from the end of the stepping platform 13 away from the fixed platform 14, and the second guide roller 153 is installed at the second end of the mounting bracket 131 and is located below the first guide roller 152.

[0063] By setting up the mounting bracket 131, the second guide roller 153 is indirectly mounted on the bottom of the stepping platform 13 through the mounting bracket 131, which can ensure that the second guide roller 153 extends outward to the outside of the stepping platform 13. In this way, the conveyor belt 11 wound around the second guide roller 153 can also be exposed to the outside of the stepping platform 13, thereby facilitating the installation and adjustment of the conveyor belt 11.

[0064] Figure 5 The third embodiment of the transport main body device 1 provided by the present invention is shown. Figure 5 As shown, the conveyor belt driving mechanism 15 for driving the conveyor belt includes a driving roller 151, a tensioning roller 156, a guide roller 157 and a rotating bracket 155, wherein:

[0065] The active roller 151 is arranged at the end of the fixed platform 14 away from the stepping platform 13, the first end of the rotating bracket 155 is rotatably connected to the base 12, the second end of the rotating bracket 155 is located above the first end and extends outward from the end of the stepping platform 13 away from the fixed platform 14, the tensioning roller 156 is connected to the second end of the rotating bracket 155, and the guide roller 157 is installed on the base 12 and located below the tensioning roller 156; the conveyor belt 11 is wound around the active roller 151, the tensioning roller 156 and the guide roller 157 in sequence. In this way, compared with the first and second embodiments mentioned above, the rollers in this embodiment are located on the inner side of the conveyor belt, and the transmission surface of the conveyor belt 11 does not contact any rollers, which can reduce the wear of the transmission surface of the conveyor belt;

[0066] During the process of the stepping platform 13 stepping away from the fixed platform 14, the rotating bracket 155 is configured to rotate toward the stepping platform 13, so that the part of the conveyor belt 11 that steps and extends on the stepping platform 13 is the part of the conveyor belt released by the rotation of the rotating bracket 155. At the same time, the conveyor belt 11 is always kept tensioned by the tensioning roller 156 on the rotating bracket 155; during the process of the stepping platform 13 stepping toward the fixed platform 14, the rotating bracket 155 is configured to rotate away from the stepping platform 13, so that the extended part of the conveyor belt 11 can be guided downward by the tensioning roller 156 and the guide roller 157 on the rotating bracket 155 and keep the conveyor belt 11 tensioned.

[0067] In order to drive the rotating bracket 155 to rotate, a rotating bracket driving mechanism may be provided in this embodiment. The rotating bracket driving mechanism may adopt various known driving mechanisms, such as a driving cylinder, etc. This embodiment does not impose any particular limitation on this.

[0068] Figure 6 A fourth embodiment of the transport main device 1 is shown, as Figure 6 As shown, the conveying main body device 1 includes a conveying mechanism and a translation driving mechanism for driving the conveying mechanism to translate. The conveying mechanism includes a base 12, a driving roller 16, a driven roller 17 and the conveyor belt 11. The driving roller 16 and the driven roller 17 are installed on the base 12, and the two ends of the conveyor belt 11 are respectively wound around the driving roller 16 and the driven roller 17; the translation driving mechanism (not shown in the figure) is connected to the base 12 to drive the base 12 to move back and forth along the conveying direction of the conveyor belt 11;

[0069] When the conveying main body device 1 moves stepwise from the second end toward the first end under the drive of the translation drive mechanism, the conveyor belt 11 is conveyed stepwise toward the second end by the same distance, thereby forming the loading station at the first end of the conveyor belt 11. Figure 6 As shown in the figure, the translation drive mechanism drives the conveying mechanism to move at a speed of v1 and in the direction indicated by the left arrow, while the conveyor belt 11 moves at a speed of v1 and in the direction indicated by the right arrow. In this way, in the process of the conveyor belt 11 stepping toward the first end (i.e., in the left direction), the first end portion of the conveyor belt is always in an empty state, forming a loading station for receiving battery cells and solder strips.

[0070] According to another aspect of the present invention, a string welding system is further provided, the string welding system comprising a welding ribbon pulling device, a battery cell transport device, a pressing tool, a welding device, and the conveying equipment as described above;

[0071] The welding tape pulling device pulls the welding tape and lays it on the loading station of the conveyor belt. During the pulling process of the welding tape, the guide device of the conveyor device guides the welding tape.

[0072] The cell transport device lays the cells toward the loading station, the cells are stacked on the rear section of the soldering ribbon at the loading station, and the pressing device presses on the front section of the soldering ribbon;

[0073] Particularly, the conveyor belt advances a predetermined length each time in a direction away from the second end, the welding ribbon traction device lays a group of welding ribbons to the loading station, and the battery cell transporting device stacks a battery cell at the loading station. After a predetermined number of the battery cells and welding ribbons are placed on the conveyor belt, the conveyor belt transports the stacked battery cells and welding ribbons toward the second end to the welding station; when stacking the battery cells, the battery cells may exceed the end of the first end of the conveyor belt, and the guide device can support the exceeding part to protect the battery cells.

[0074] The welding device is located at a welding station and is used to weld the battery cell and the welding ribbon transported to the welding station.

[0075] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, the technical solution of the present invention may be subjected to a variety of simple modifications, including combining the various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A conveying device, characterized in that: The conveying device includes a conveying main body device and a guide device; Wherein, the conveying main body device includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to operate, the first end of the conveyor belt is configured to be able to stepwise extend in a direction away from the second end and to stepwise return in a direction toward the second end, wherein, each time the conveyor belt steps a predetermined length in the direction away from the second end, the conveyor belt flips upward by a preset length at the first end, so that the upper surface of the conveyor belt of the predetermined length forms an empty loading station, and the battery cells and welding ribbons are stacked on the loading station; the conveying main body device also includes a base, a fixed platform, a stepping platform and a platform moving mechanism for driving the stepping platform to move, the stepping platform is slidably connected to the base, and the platform moving mechanism can drive the stepping platform to stepwise move toward or away from the fixed platform in the conveying direction of the conveyor belt; The guide device includes a guide body for guiding the welding strip, wherein the guide body is arranged at the first end of the conveyor belt and can move synchronously with the conveyor belt at the first end; The guide body is fixedly mounted on the stepping platform, and the stepping platform and the guide body are driven by the platform moving mechanism to move synchronously.

2. The conveying device according to claim 1, characterized in that The fixed platform is fixedly connected to the base; The conveyor belt is arranged on the fixed platform and the stepping platform. When the stepping platform moves away from the fixed platform, the conveyor belt flips from bottom to top at the end of the stepping platform away from the fixed platform, so that the upper surface of the conveyor belt extends step by step along the stepping platform in a direction away from the fixed platform. The guide body is configured to move synchronously with the stepping platform.

3. The conveying device according to claim 2, characterized in that The platform moving mechanism includes a motor and a lead screw driven by the motor, and the stepping platform is installed on a nut matched with the lead screw.

4. The conveying device according to claim 2, characterized in that The conveyor belt driving mechanism includes an active roller, a first guide roller, a second guide roller and a tensioning roller; the active roller is arranged at an end of the fixed platform away from the stepping platform, the first guide roller is located at the end of the stepping platform away from the fixed platform, and the first guide roller and the second guide roller are installed on the stepping platform, the tensioning roller is located below the first guide roller and the second guide roller, and the tensioning roller is arranged to be able to move back and forth and adjust along the conveying direction of the conveyor belt to tension the conveyor belt; the conveyor belt is sequentially wound around the active roller, the first guide roller, the second guide roller and the tensioning roller, wherein the second guide roller is located on the transmission surface of the conveyor belt; when the stepping platform moves away from the fixed platform, the first guide roller and the second guide roller guide the conveyor belt to flip and extend upward from below; or, The conveyor belt driving mechanism includes an active roller, a guide roller, a tensioning roller and a rotating bracket, wherein: the active roller is arranged at an end portion of the fixed platform away from the stepping platform, the first end of the rotating bracket is rotatably connected to the base, the second end of the rotating bracket is located above the first end and extends outward from the end portion of the stepping platform away from the fixed platform, the tensioning roller is connected to the second end of the rotating bracket, and the guide roller is installed on the base and is located below the tensioning roller; the conveyor belt is wound around the active roller, the tensioning roller and the guide roller in sequence; in the process of the stepping platform stepping away from the fixed platform, the rotating bracket is configured to rotate toward the stepping platform, and the part of the conveyor belt that steps and extends on the stepping platform is the part of the conveyor belt released by the rotating bracket through rotation; in the process of the stepping platform stepping toward the fixed platform, the rotating bracket is configured to rotate away from the stepping platform.

5. The conveying device according to any one of claims 1 to 4, characterized in that: The guide body includes a guide plate with a guide groove provided on its upper surface, and the extending direction of the guide groove is consistent with the conveying direction of the conveyor belt.

6. The conveying device according to claim 5, characterized in that The guide body further comprises a plurality of clamping claws for clamping the welding strips, which are arranged at one end of the guide plate close to the conveyor belt, and each of the clamping claws is arranged corresponding to one of the guide grooves.

7. The conveying device according to any one of claims 1 to 4, characterized in that: The guide device further includes a lifting mechanism for driving the guide body to move up and down.

8. A string welding system, characterized in that: The string welding system includes a welding ribbon pulling device, a battery cell handling device, a pressing tool, a welding device and a conveying device according to any one of claims 1 to 7; The welding tape pulling device pulls the welding tape and lays it on the loading station of the conveyor belt. During the pulling process of the welding tape, the guide device of the conveyor device guides the welding tape. The cell transport device lays the cells toward the loading station, the cells are stacked on the rear section of the soldering ribbon at the loading station, and the pressing device presses on the front section of the soldering ribbon; The conveyor belt advances a predetermined length each time in a direction away from the second end, the welding ribbon pulling device lays a group of welding ribbons toward the loading station, and the battery cell transporting device stacks a battery cell at the loading station. After a predetermined number of the battery cells and welding ribbons are placed on the conveyor belt, the conveyor belt transports the stacked battery cells and welding ribbons toward the second end to the welding station. The welding device is located at a welding station and is used to weld the battery cell and the welding ribbon transported to the welding station.

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