Photovoltaic cell conveying device

Abstract

This application relates to a photovoltaic cell conveying device, comprising: a drive unit; a conveyor belt wound around the drive unit, the conveyor belt being capable of cyclic movement under the drive of the drive unit, the conveyor belt having a negative pressure chamber, the chamber wall of which has adsorption holes connecting the negative pressure chamber to the external atmosphere; wherein, the conveyor belt is capable of undergoing recoverable deformation under the action of the drive unit to change the volume of the negative pressure chamber. In the above-mentioned photovoltaic cell conveying device, the conveyor belt cyclically moves under the drive of the drive unit to realize the conveying of the cells. Since the formation of the negative pressure environment in the negative pressure chamber relies solely on the action of the drive unit and the deformation of the conveyor belt itself, the structure of this photovoltaic cell conveying device is simple and reliable, eliminating the need for external vacuum equipment and complex connecting pipelines, thus avoiding the problems of large space occupation, high energy consumption, high noise and heat generation caused by the installation of external vacuum equipment, and significantly reducing production costs.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and in particular to a photovoltaic cell conveying device. Background Technology

[0002] Solar modules are fabricated by dividing a single solar cell into several sub-cells (such as two-cell, three-cell, and four-cell cells). This reduces the resistance loss of the module and increases the density of the cells encapsulated in the module, thereby improving the efficiency of the solar module. This method is not only applicable to large-scale ground-mounted power plants and distributed power plants, but also to other civilian photovoltaic consumer fields, such as mobile charging, building-integrated photovoltaics, and indoor photovoltaics.

[0003] However, the relatively small size of multi-segment solar cells makes them difficult to transmit stably and prone to misalignment, which in turn causes jamming and affects the production efficiency of solar cells. Summary of the Invention

[0004] Therefore, it is necessary to provide a photovoltaic cell conveying device to address the problem of unstable transmission of multi-segment cells.

[0005] A photovoltaic cell conveying device, comprising:

[0006] Drive unit; and

[0007] A conveyor belt is wound around the drive unit and can move cyclically under the drive of the drive unit. The conveyor belt has a negative pressure chamber, and the chamber wall of the negative pressure chamber has adsorption holes that connect the negative pressure chamber with the outside atmosphere.

[0008] The conveyor belt is capable of undergoing recoverable deformation under the action of the drive unit to change the volume of the negative pressure chamber.

[0009] In one embodiment, the conveyor belt is made of a flexible material.

[0010] In one embodiment, the conveyor belt has a plurality of negative pressure chambers, all of which are arranged at intervals along the conveying direction of the conveyor belt, and each negative pressure chamber has an adsorption hole in its wall.

[0011] In one embodiment, the conveyor belt includes a bearing surface and a non-bearing surface disposed opposite to each other, the negative pressure cavity is formed between the bearing surface and the non-bearing surface, and the adsorption hole is formed on the bearing surface.

[0012] In one embodiment, the bearing surface is an arc surface, and the bearing surface has a central bearing area and two edge bearing areas. In the conveying direction of the conveyor belt, the two edge bearing areas are respectively located on opposite sides of the central bearing area.

[0013] The distances between the two edge bearing regions and the non-bearing surface are both less than the distance between the middle bearing region and the non-bearing surface.

[0014] In one embodiment, the adsorption pore is located in the intermediate bearing region.

[0015] In one embodiment, the conveyor belt has a sealing portion surrounding the adsorption hole, the hardness of which is less than the hardness of other parts of the conveyor belt excluding the sealing portion.

[0016] In one embodiment, the roughness of the surface of the sealing portion facing away from the negative pressure chamber is less than the roughness of the surface of the other parts of the conveyor belt facing away from the negative pressure chamber, excluding the sealing portion.

[0017] In one embodiment, the drive unit includes two sets of spaced-apart conveyor wheels, and the conveyor belt is wound around the two sets of conveyor wheels, the conveyor belt being capable of undergoing recoverable deformation under the compression of the conveyor wheels.

[0018] In one embodiment, the photovoltaic cell conveying device includes multiple sets of the drive units, all of which are arranged at intervals, and each set of drive units is wound around at least one conveyor belt.

[0019] In the aforementioned photovoltaic cell conveying device, the conveyor belt circulates under the drive of the drive unit to transport the cells. During the operation of the conveyor belt, it can deform under the action of the drive unit to expel air. As the conveyor belt gradually returns to its original state, when a cell blocks the adsorption hole, a negative pressure environment is formed in the negative pressure chamber to adsorb the cell, thereby achieving stable cell transport.

[0020] Since the negative pressure environment in the negative pressure chamber is formed solely by the action of the drive unit and the deformation of the conveyor belt itself, the structure of this photovoltaic cell conveying device is simple and reliable. It does not require connection to external vacuum equipment or complex connecting pipelines, thus avoiding problems such as large space occupation, high energy consumption, high noise and heat generation caused by the setting of external vacuum equipment, and significantly reducing production costs. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a photovoltaic cell conveying device according to an embodiment of this application.

[0024] Figure 2 for Figure 1 A top view of the conveyor belt of the photovoltaic cell conveying device shown.

[0025] Figure 3 for Figure 1 The front view of the photovoltaic cell conveying device shown.

[0026] Figure 4 for Figure 1 The side view of the photovoltaic cell conveying device shown.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Photovoltaic cell conveying device; 120. Drive unit; 140. Conveyor belt; 140a. Negative pressure chamber; 141. Bearing surface; 141a. Middle bearing area; 141b. Edge bearing area; 141c. Adsorption hole; 143. Non-bearing surface; 145. Sealing part. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] See Figure 1 This application provides a photovoltaic cell conveying device 100 for conveying photovoltaic cells. The photovoltaic cells can be multi-cell cells, and the types of multi-cell cells include, but are not limited to, emitters such as: Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), perovskite cells, multi-busbar cells (MBB), and busbarless cells (OBB).

[0036] Multi-segment solar cells can be bi-segmented, tri-segmented, or quadri-segmented, etc. This application uses a quadri-segmented solar cell as an example, dividing a complete solar cell into four equal parts to form a quadri-segmented solar cell. As described in the background art, because the solar cell is divided into four parts, the size of the quadri-segmented solar cell changes from 213mm × 182mm to 52.25mm × 182mm. Due to the smaller size of the quadri-segmented solar cell, it is prone to irregular offsets during transportation, making precise positioning difficult. This can easily cause jamming and unstable transportation, reducing production efficiency and increasing production costs.

[0037] To address the aforementioned issues, some current conveying devices employ a vacuum adsorption belt structure for transporting photovoltaic cells. Specifically, the vacuum adsorption belt structure includes a belt and a vacuum generating chamber located beneath the belt. The vacuum generating chamber is connected to an external negative pressure blower via connecting pipelines. The external negative pressure blower extracts air from the vacuum generating chamber to create negative pressure, thereby adsorbing the photovoltaic cells above the belt to achieve the positioning and transport of the photovoltaic cells.

[0038] While the above technical solutions have solved the problem of photovoltaic cells easily shifting during transmission to some extent, the vacuum generating cavity is limited by its structure and cannot cover most of the belt. This results in unstable transmission of photovoltaic cells between two belt sections, which can still cause the photovoltaic cells to shift and become stuck during transmission.

[0039] Furthermore, since each conveying station requires the installation of a vacuum generating chamber, the vacuum generating chamber itself is not only structurally complex, but also requires connecting pipelines (including conveying pipelines and electrical control lines) between the negative pressure blower and the vacuum chamber. External negative pressure blowers are not only expensive, but also have disadvantages such as large space occupation, high energy consumption, high noise and heat generation, which significantly increases production costs.

[0040] Furthermore, during the transport of photovoltaic cells, as the belt gradually covers the vacuum generating cavity, it is difficult to form a stable negative pressure when the belt first comes into contact with the vacuum generating cavity. This not only affects the transport stability but also causes energy waste.

[0041] To address the aforementioned technical issues, such as Figures 1 to 3 As shown, the photovoltaic cell conveying device 100 of this application includes a drive unit 120 and a conveyor belt 140.

[0042] A conveyor belt 140 is wound around a drive unit 120 and can circulate under the drive of the drive unit 120. The conveyor belt 140 has a negative pressure chamber 140a, and the wall of the negative pressure chamber 140a has adsorption holes 141c that connect the negative pressure chamber 140a to the external atmosphere. The conveyor belt 140 can undergo recoverable deformation under the action of the drive unit 120 to change the volume of the negative pressure chamber 140a.

[0043] Thus, the conveyor belt 140 moves cyclically under the drive of the drive unit 120 to transport the photovoltaic cells. During the operation of the conveyor belt 140, the conveyor belt 140 can deform under the action of the drive unit 120 to expel air. As the conveyor belt 140 gradually returns to its original state, when the photovoltaic cells carried on the conveyor belt 140 block the adsorption holes 141c, a negative pressure environment will be formed in the negative pressure chamber 140a, and the photovoltaic cells will be adsorbed through the adsorption holes 141c, thereby achieving stable transport of the photovoltaic cells.

[0044] Since the negative pressure environment is formed solely by the action of the drive unit 120 and the deformation of the conveyor belt 140 itself, the structure of the photovoltaic cell conveying device 100 is simple and reliable. It does not require connection to external vacuum equipment or complex connecting pipelines, effectively avoiding problems such as large space occupation, high energy consumption, high noise and heat generation caused by the setting of external vacuum equipment, significantly reducing production costs and improving production efficiency.

[0045] In some embodiments, the photovoltaic cell conveying device 100 includes multiple sets of drive units 120, all drive units 120 are arranged at intervals, and each set of drive units 120 is wound around at least one conveyor belt 140. All drive units 120 and conveyor belt 140 can together form a conveyor chain to convey photovoltaic cells.

[0046] It is understood that the number of drive units 120 and conveyor belts 140, and the arrangement of drive units 120 can be set as needed. By changing the number of drive units 120 and conveyor belts 140, and the arrangement of drive units 120, the conveying length and conveying direction of the photovoltaic cell conveying device 100 can be changed as needed to meet different conveying requirements.

[0047] In some embodiments, each drive unit 120 includes two sets of spaced-apart conveyor wheels, and a conveyor belt 140 is wound around the two sets of conveyor wheels to form a closed loop structure. The conveyor wheels can rotate continuously to drive the conveyor belt 140 to move cyclically, thereby placing photovoltaic cells on the conveyor belt 140 to realize the conveying of photovoltaic cells. It is understood that the specific structure of the drive unit 120 can be set as needed to meet different driving requirements.

[0048] Thus, when a portion of the conveyor belt 140 passes the conveyor wheel, this portion undergoes recoverable deformation under the pressure of the outer circumference of the conveyor wheel to expel air from the corresponding negative pressure chamber 140a. Once the portion of the conveyor belt 140 that has expelled air leaves the conveyor wheel, the force exerted by the conveyor wheel on the conveyor belt 140 disappears, and this portion gradually returns to its original shape. At this time, when the photovoltaic cells carried on this portion of the conveyor belt 140 block the corresponding adsorption holes 141c, external air cannot normally enter the negative pressure chamber 140a. Therefore, a negative pressure environment is formed inside the negative pressure chamber 140a, adsorbing the photovoltaic cells and thus achieving stable transmission of the photovoltaic cells.

[0049] Please see Figures 2 to 4 The conveyor belt 140, when unfolded, has a long, strip-shaped structure, and the material of the conveyor belt 140 includes flexible materials. In one embodiment, the conveyor belt 140 is formed of a rubber material, and therefore can undergo recoverable deformation under external force. It is understood that the material of the conveyor belt 140 is not limited to this, and can be configured as needed to meet different requirements.

[0050] In some embodiments, the conveyor belt 140 has a plurality of negative pressure chambers 140a, all of which are arranged at intervals along the conveying direction of the conveyor belt 140. Specifically, in one embodiment, all negative pressure chambers 140a are arranged at equal intervals along the conveying direction of the conveyor belt 140, each negative pressure chamber 140a has the same shape and size, and each negative pressure chamber 140a has an adsorption hole 141c on its cavity wall.

[0051] Depending on the size relationship between the negative pressure chamber 140a and the photovoltaic cell, the correspondence between the negative pressure chamber 140a and the photovoltaic cell also varies. For example, in some embodiments, one negative pressure chamber 140a can adsorb one photovoltaic cell, while in other embodiments, multiple adjacent negative pressure chambers 140a can jointly adsorb one photovoltaic cell, such as four adjacent negative pressure chambers 140a jointly adsorbing one photovoltaic cell.

[0052] Since the negative pressure chambers 140a are arranged at intervals along the conveying direction of the conveyor belt 140, and the part without negative pressure chambers 140a can be a solid structure, the structural strength of the conveyor belt 140 is effectively guaranteed, while the manufacturing process of the conveyor belt 140 is simplified.

[0053] Specifically, in some embodiments, the distance D1 between two adjacent negative pressure chambers 140a is 10mm-20mm, optionally 15mm. The length L of the negative pressure chamber 140a in the conveying direction of the conveyor belt 140 is 45mm-55mm, optionally 50mm. The width W of the negative pressure chamber 140a is 35mm-45mm, optionally 40mm. The height H of the negative pressure chamber 140a is 1.5mm-2mm, optionally 1.8mm. The volume of the negative pressure chamber 140a is 2500mm². 3 -4500mm 3 3000mm is optional 3 The wall thickness of the negative pressure chamber 140a is 0.3-0.7mm, and can be selected as 0.5mm.

[0054] It is understood that the size, volume, and distance between two adjacent negative pressure chambers 140a are not limited to these and can be set as needed to meet the different requirements of different photovoltaic cells.

[0055] In some embodiments, the conveyor belt 140 includes a bearing surface 141 and a non-bearing surface 143 disposed opposite to each other in its thickness direction, a negative pressure chamber 140a is formed between the bearing surface 141 and the non-bearing surface 143, an adsorption hole 141c is opened on the bearing surface 141, and a photovoltaic cell is supported on the bearing surface 141 and adsorbed through the adsorption hole 141c.

[0056] In some embodiments, the non-load-bearing surface 143 is a plane, and the load-bearing surface 141 is an arc-shaped surface convex in a direction away from the non-load-bearing surface 143, having a central load-bearing region 141a and two edge load-bearing regions 141b. In the conveying direction of the conveyor belt 140, the two edge load-bearing regions 141b are located on opposite sides of the central load-bearing region 141a, and the distances of the two edge load-bearing regions 141b relative to the non-load-bearing surface 143 are both less than the distance of the central load-bearing region 141a relative to the non-load-bearing surface 143. In one embodiment, in the conveying direction of the conveyor belt 140, the distance between the load-bearing surface 141 and the non-load-bearing surface 143 first gradually increases and then gradually decreases. It can be understood that the shape of the load-bearing surface 141 can be set as needed to achieve an ideal load-bearing effect.

[0057] Thus, the outwardly protruding bearing surface 141 helps to increase its contact area with the photovoltaic cell, effectively preventing gaps between the bearing surface 141 and the photovoltaic cell, thereby affecting the sealing effect of the photovoltaic cell on the adsorption hole 141c, which in turn helps to form a negative pressure environment in the negative pressure chamber 140a, ultimately ensuring a good positioning effect.

[0058] Conversely, if the bearing surface 141 is a flat surface or an inwardly concave arc surface, it will cause the bearing surface 141 to be unable to make effective contact with the photovoltaic cell, and there will be a gap between the two, which will cause the adsorption hole 141c to be unable to be effectively sealed by the photovoltaic cell, thereby affecting the formation of the negative pressure environment in the negative pressure chamber 140a, and ultimately causing the photovoltaic cell to be unable to be stably confined on the bearing surface 141.

[0059] In some embodiments, the adsorption hole 141c is circular in shape, and the diameter R of the adsorption hole 141c is 4mm-6mm, optionally 5mm. There are two adsorption holes 141c, both of which are located in the middle bearing area 141a, and the two adsorption holes 141c are spaced apart in the width direction of the conveyor belt 140. The distance D2 between the center points of the two adsorption holes 141c is 15mm-25mm, optionally 20mm.

[0060] Thus, since the adsorption hole 141c is located in the central area of ​​the bearing surface 141, and the bearing surface 141 is an outwardly convex arc shape, the edge of the adsorption hole 141c can be in close contact with the photovoltaic cell, thereby ensuring that the adsorption hole 141c is effectively sealed by the photovoltaic cell. It can be understood that the location and number of adsorption holes 141c can be set as needed to meet different positioning requirements.

[0061] In some embodiments, the conveyor belt 140 has a sealing portion 145 surrounding the adsorption hole 141c. The sealing portion 145 is circumferentially surrounding the adsorption hole 141c to form an annular structure, and the hardness of the sealing portion 145 is less than the hardness of other parts of the conveyor belt 140 except for the sealing portion 145. Specifically, in one embodiment, the sealing portion 145 may be formed of a material with low hardness, such as silicone. It is understood that the shape of the sealing portion 145 and the material forming the sealing portion 145 are not limited, and the width of the sealing portion 145 can also be set as needed to meet different sealing requirements.

[0062] Thus, since the sealing part 145 is more flexible than other parts of the conveyor belt 140, it can better fit the photovoltaic cell, thereby improving the sealing effect of the photovoltaic cell on the adsorption hole 141c and ensuring the formation of a stable negative pressure environment in the negative pressure chamber 140a.

[0063] In some embodiments, the sealing portion 145 extends smoothly on the side facing away from the negative pressure chamber 140a, and the roughness of this surface is less than the roughness of the other parts of the conveyor belt 140 (i.e., the other areas of the bearing surface 141 excluding the sealing portion 145) facing away from the negative pressure chamber 140a. In some embodiments, the bearing surface 141 is provided with anti-slip patterns, thereby increasing the roughness of the bearing surface 141.

[0064] In this way, the sealing part 145 can fit tightly against the photovoltaic cell through its smooth surface, thereby improving the sealing effect of the photovoltaic cell on the adsorption hole 141c, which is more conducive to the formation of a stable negative pressure environment in the negative pressure chamber 140a. At the same time, since the roughness of the bearing surface 141 of the conveyor belt 140, except for the sealing part 145, is relatively high, the friction between the photovoltaic cell and the conveyor belt 140 can be increased, thereby effectively preventing the photovoltaic cell from sliding relative to the conveyor belt 140, further improving the positioning effect of the photovoltaic cell, and realizing the stable transportation of the photovoltaic cell.

[0065] It is understood that the specific values ​​of the roughness of the surface of the sealing part 145 facing away from the negative pressure chamber 140a, and the roughness of the bearing surface 141 of the conveyor belt 140 other areas besides the sealing part 145, can be set as needed to meet different conveying requirements.

[0066] The aforementioned photovoltaic cell conveying device 100, through the cooperation of the drive unit 120 and the conveyor belt 140, can create a negative pressure environment in the negative pressure chamber 140a of the conveyor belt 140 to adsorb photovoltaic cells, thereby ensuring stable transmission of photovoltaic cells. The photovoltaic cell conveying device 100 not only has a simple and reliable overall structure and is easy to maintain, but also has advantages such as low noise, low cost, and small footprint, effectively improving the production efficiency of photovoltaic cells and reducing their production cost.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A photovoltaic cell conveying device, characterized in that, include: Drive unit; and A conveyor belt is wound around the drive unit and can circulate under the drive of the drive unit. The conveyor belt includes a bearing surface and a non-bearing surface arranged opposite each other, and a negative pressure cavity is formed between the bearing surface and the non-bearing surface. The bearing surface is an arc surface that bulges in the direction away from the non-bearing surface. The bearing surface has a middle bearing area and two edge bearing areas. In the conveying direction of the conveyor belt, the two edge bearing areas are respectively located on opposite sides of the middle bearing area. The distance between the two edge bearing areas and the non-bearing surface is smaller than the distance between the middle bearing area and the non-bearing surface. The bearing surface has an adsorption hole that connects the negative pressure cavity with the outside atmosphere, and the adsorption hole is located in the middle bearing area. The conveyor belt is capable of undergoing recoverable deformation under the action of the drive unit to change the volume of the negative pressure chamber.

2. The photovoltaic cell conveying device according to claim 1, characterized in that, The conveyor belt is made of flexible materials.

3. The photovoltaic cell conveying device according to claim 1, characterized in that, The conveyor belt has multiple negative pressure chambers, all of which are arranged at intervals along the conveying direction of the conveyor belt, and each negative pressure chamber has an adsorption hole in its wall.

4. The photovoltaic cell conveying device according to claim 1, characterized in that, The conveyor belt has a sealing portion surrounding the adsorption hole, and the hardness of the sealing portion is less than the hardness of the other parts of the conveyor belt excluding the sealing portion.

5. The photovoltaic cell conveying device according to claim 4, characterized in that, The roughness of the surface of the sealing part facing away from the negative pressure chamber is less than the roughness of the surface of the other parts of the conveyor belt facing away from the negative pressure chamber, excluding the sealing part.

6. The photovoltaic cell conveying device according to any one of claims 1 to 5, characterized in that, The drive unit includes two sets of spaced-apart conveyor wheels, and the conveyor belt is wound around the two sets of conveyor wheels. The conveyor belt can generate recoverable deformation under the compression of the conveyor wheels.

7. The photovoltaic cell conveying device according to claim 6, characterized in that, The photovoltaic cell conveying device includes multiple sets of drive units, all of which are arranged at intervals, and each set of drive units is wound around at least one conveyor belt.

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