Welding device for photovoltaic module

Abstract

The utility model relates to the technical field of welding devices, in particular to a photovoltaic module welding device which comprises a machining table and an air exhaust mechanism. The processing table is provided with a placing surface, the placing surface is configured to sequentially place a to-be-processed photovoltaic module and a flexible film in a stacked mode in the direction away from the placing surface, the flexible film covers the to-be-processed photovoltaic module, the edge of the flexible film is attached to the placing surface, the to-be-processed photovoltaic module comprises solar cells and a welding strip, and each solar cell is provided with a to-be-welded part; the welding strip is located between the flexible film and the to-be-welded part, the solar cells are arranged at intervals, and a gap is formed between every two adjacent solar cells. The air exhaust mechanisms are configured to communicate with the multiple gaps, negative pressure is formed between the flexible film and the placing face through the gaps, so that the part of the flexible film deforms in the direction close to the placing face to be tightly attached to the welding strip, and the welding strip deforms to make contact with the to-be-welded part. According to the welding device, the welding quality can be improved, and the probability of abnormal welding of the to-be-welded part on the edge of the solar cell is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of welding devices, and in particular to a welding device for photovoltaic modules. Background Art

[0002] During the photovoltaic module welding process, the soldering ribbon needs to contact the part to be welded on the solar cell to ensure good alloying at the contact point. However, the structure of some types of solar cells can prevent the soldering ribbon from contacting the part to be welded. For example, the surface of the insulating adhesive layer on the back-contact solar cell is higher than the surface of the part to be welded. After the soldering ribbon is placed on the back-contact solar cell, the insulating adhesive layer blocks the soldering ribbon from contacting the part to be welded. Therefore, when stringing back-contact solar cells, a flexible film is required. The flexible film is vacuumed to hold the soldering ribbon close to the part to be welded. However, welding anomalies such as cold solder joints can still occur at the edges of the back-contact solar cell. Utility Model Content

[0003] The embodiment of the present application discloses a photovoltaic module welding device, which can ensure good contact between the welding strip and the part to be welded to improve the welding quality, and particularly reduce the probability of welding abnormalities occurring in the part to be welded at the edge of the solar cell.

[0004] To achieve the above objectives, the present invention discloses a photovoltaic module welding device, comprising:

[0005] a processing table having a placement surface configured to sequentially stack photovoltaic modules to be processed and a flexible film in a direction away from the placement surface, the flexible film covering the photovoltaic modules to be processed with an edge of the flexible film abutting the placement surface, the photovoltaic modules to be processed comprising solar cells and welding ribbons, each solar cell having a portion to be welded, the welding ribbon being located between the flexible film and the portion to be welded, the plurality of solar cells being spaced apart with a gap between adjacent ones; and

[0006] and a plurality of exhaust mechanisms, each of which is configured to communicate with a plurality of the gaps and form a negative pressure between the flexible membrane and the placement surface through the gaps, so that a portion of the flexible membrane is deformed toward the placement surface and closely adheres to the welding strip, and the welding strip is deformed and contacts the portion to be welded.

[0007] Optionally, a plurality of air guiding channels are provided on the placement surface, each of the air guiding channels is configured to be in communication with the gap, and each of the air extraction mechanisms is in communication with each of the air guiding channels.

[0008] Optionally, the air guide channel is a strip-shaped air guide groove, each of the air guide grooves is configured to be located on the same straight line as one of the gaps, the air guide groove has a first air pumping section and a second air pumping section that are connected to each other, the first air pumping section is configured to be located within the coverage range of the photovoltaic component to be processed, and the second air pumping section is configured to be located within the coverage range of the flexible membrane outside the photovoltaic component to be processed, and each of the air pumping mechanisms is respectively connected to each of the second air pumping sections.

[0009] Optionally, the plurality of air guiding channels are symmetrically arranged on two opposite sides of the placement surface, the plurality of air guiding channels located on the same side of the placement surface are spaced apart, and each air guiding channel is configured to communicate with the plurality of gaps.

[0010] Optionally, a collecting recess is further provided on the placement surface, the collecting recess is communicated with the air guide channel, and the collecting recess is configured to be located within the coverage of the flexible film at the periphery of the photovoltaic assembly to be processed;

[0011] The air extraction mechanism includes a movable part, which is arranged in the collecting recess and is configured to move along the depth direction of the collecting recess. A first air extraction hole is provided on the movable part, and the first air extraction hole is configured to extract air from the collecting recess.

[0012] Optionally, the air extraction mechanism further comprises a power element, the power element is connected to the movable part in a driving manner, and the power element is configured to drive the movable part to move;

[0013] And / or, the movable member is a movable block, the collecting recess is a collecting groove, and the movable block is loosely fitted with the collecting groove;

[0014] And / or, the collecting recess is strip-shaped, the length direction of the collecting recess is perpendicular to the length direction of the air guiding channel, and the air guiding channel is connected to the middle part of the collecting recess;

[0015] And / or, the first air extraction hole penetrates the movable member along the depth direction of the collecting recess, and the air inlet of the first air extraction hole is located on a side of the movable member facing the placement surface;

[0016] And / or, the number of the first air extraction holes is two, and the two first air extraction holes are respectively arranged at two ends of the movable block.

[0017] Optionally, the welding device further comprises:

[0018] A limiting member, wherein a plurality of the limiting members are respectively arranged on two opposite sides of the placement surface, and the plurality of the limiting members are configured to limit and block the two opposite sides of the photovoltaic component to be processed; a second exhaust hole is provided on the limiting member, and the limiting member is also configured to be located within the coverage range of the flexible membrane, and the second exhaust hole is configured to form a negative pressure between the flexible membrane and the placement surface.

[0019] Optionally, the welding device further comprises:

[0020] A plurality of conveyor belts are provided, wherein parts of the conveyor belts are located on the placement surface, and the conveyor belts are configured to convey the photovoltaic components to be processed to the placement surface.

[0021] Optionally, the welding device further comprises:

[0022] a plurality of lasers, each of which is disposed corresponding to the placement surface and configured to weld the welding ribbon and the portion to be welded through the flexible film; and

[0023] A displacement driving mechanism is configured to drive the plurality of lasers to move in a direction parallel to the placement surface.

[0024] Optionally, the photovoltaic component to be processed also includes a light-transmitting panel and a component end film, the solar cell is a back-contact solar cell, and the placement surface is configured to stack the light-transmitting panel, the component end film, the back-contact solar cell, the welding strip and the flexible film in sequence along a direction away from the placement surface.

[0025] Compared with the prior art, the beneficial effect of the present application is that the exhaust mechanism of the welding device forms a negative pressure between the flexible membrane and the placement surface. Under the action of the air pressure, the flexible membrane is partially deformed in the direction close to the placement surface, so that the flexible membrane is close to the welding strip, and the welding strip is bent and deformed under the force. The welding strip is deformed and contacts the part to be welded. The welding strip and the part to be welded form good contact, which is beneficial to improving the welding quality and reducing welding abnormalities such as cold welding.

[0026] Furthermore, if the residual gas in the gap between the two solar cells is not exhausted, it will cause the welded parts on the edge of the solar cell to be prone to welding abnormalities such as cold welds. The exhaust mechanism is precisely to exhaust the gap in a targeted manner to further reduce the probability of welding abnormalities in the welded parts near the gap, that is, to reduce the probability of welding abnormalities at the edge of the solar cell.

[0027] In summary, the welding device is connected to the gap between the two solar cells through the exhaust mechanism, and a negative pressure is formed between the flexible membrane and the placement surface through the gap, which can not only ensure good contact between the welding strip and the part to be welded and improve the welding quality, but also particularly reduce the probability of welding abnormalities in the part to be welded at the edge of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0029] Figure 1 This is a schematic structural diagram of a welding device disclosed in an embodiment of the present application;

[0030] Figure 2 for Figure 1 The AA section shown in ;

[0031] Figure 3 This is a structural diagram of a processing table disclosed in an embodiment of the present application after placing a photovoltaic module to be processed (not covered with a flexible film);

[0032] Figure 4 This is a schematic diagram of the structure after the photovoltaic modules and flexible films to be processed are placed on the processing table disclosed in the embodiment of this application;

[0033] Figure 5 for Figure 4 BB cross-section shown in;

[0034] Figure 6 This is a schematic diagram of the flexible film and the photovoltaic module to be processed before vacuuming according to an embodiment of the present application;

[0035] Figure 7 This is a schematic diagram of the flexible film and the photovoltaic module to be processed after degassing according to an embodiment of the present application;

[0036] Figure 8 This is another structural schematic diagram of the welding device disclosed in an embodiment of the present application;

[0037] Figure 9 This is a schematic structural diagram of the displacement drive mechanism disclosed in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. Welding device; 11. Processing table; 12. Placement surface; 13. Air guide channel; 131. First exhaust section; 132. Second exhaust section; 14. Collecting recess; 15. Exhaust mechanism; 151. Movable part; 152. First exhaust hole; 153. Power element; 16. Limiting part; 161. Second exhaust hole; 17. Conveyor belt; 18. Laser; 19. Displacement drive mechanism; 191. Slide rail; 192. Slider; 193. Gantry; 194. Rack; 195. Mounting plate; 196. Motor; 197. Gear; 2. Photovoltaic module to be processed; 21. Solar cell; 211. Portion to be welded; 212. Gap; 213. Insulating adhesive layer; 22. Welding ribbon; 23. Transparent panel; 24. Module end adhesive film; 3. Flexible film. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] In this application, terms such as "upper," "lower," "inner," and "outer" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to specific positions, or to their construction or operation in a specific position.

[0042] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0045] When laser welding back-contact solar cells, solder paste is not used for welding. Instead, a flexible film is covered on the solar cell to be welded and the flexible film is evacuated under negative pressure.

[0046] The main reason for using a flexible film is that the positive and negative electrodes of the back-contact solar cell are both on the back. To avoid short circuits, an insulating adhesive layer needs to be printed on the electrodes of the back-contact solar cell, and a portion to be welded, such as a pad, is provided on the electrode. A height difference will be formed between the insulating adhesive layer and the portion to be welded, that is, the insulating adhesive layer prevents the contact between the soldering ribbon and the portion to be welded. Since the laser welding pulse intensity is high and the energy is concentrated, the alloying requirements can be achieved by directly welding the soldering ribbon to the portion to be welded. There is no need to use solder paste to fill the height difference, which also saves the cost of solder paste. In order to ensure good alloying between the soldering ribbon and the portion to be welded, the soldering ribbon and the portion to be welded are as close as possible. Therefore, a flexible film is needed to cover the back-contact solar cell and the soldering ribbon during welding, and a negative pressure is formed by exhausting air to make the soldering ribbon and the portion to be welded fit as close as possible, and then laser welding is performed.

[0047] However, the inventors discovered that after back-contact solar cells are welded using the flexible film covering method, the welded portions at the edge of the back-contact solar cells are still prone to welding anomalies such as cold solder joints. Analysis revealed that since the back-contact solar cells are spaced apart according to a layout, there are certain gaps between adjacent back-contact solar cells, and the welded portions at the edge of the back-contact solar cells are close to these gaps. During the vacuuming of the flexible film, the air in the gaps is difficult to completely expel, and the flexible film corresponding to the gaps is insufficiently deformed, resulting in a loose fit between the welding ribbon and the welded portions at the edge of the back-contact solar cell. After laser welding, these portions are prone to welding anomalies such as cold solder joints. Cold solder joints can cause insufficient welding tension in the welding ribbon, ultimately affecting the reliability of the photovoltaic module.

[0048] Based on the above analysis, an embodiment of the present application provides a welding device, which is connected to the gap between the two solar cells through an exhaust mechanism, and forms a negative pressure between the flexible membrane and the placement surface through the gap. This can not only enable the welding strip and the part to be welded to form good contact and improve the welding quality, but also particularly reduce the probability of welding abnormalities in the part to be welded at the edge of the solar cell.

[0049] The technical solution of the present utility model will be described below with reference to the embodiments and drawings.

[0050] like Figures 1 to 7 As shown, an embodiment of the present application discloses a photovoltaic module welding device 1, including a processing table 11 and a plurality of exhaust mechanisms 15.

[0051] The processing table 11 has a placement surface 12, and the placement surface 12 is configured to sequentially stack the photovoltaic components 2 to be processed and the flexible film 3 in a direction away from the placement surface 12. Figure 3 The flexible film 3 covers the photovoltaic module 2 to be processed, and the edge of the flexible film 3 is in contact with the placement surface 12. The photovoltaic module 2 to be processed includes solar cells 21 and welding ribbons 22. Each solar cell 21 has a portion 211 to be welded. The welding ribbon 22 is located between the flexible film 3 and the portion 211 to be welded. The multiple solar cells 21 are spaced apart, and a gap 212 is formed between adjacent solar cells 21.

[0052] Each exhaust mechanism 15 is configured to communicate with a plurality of gaps 212 and form a negative pressure between the flexible membrane 3 and the placement surface 12 through the gaps 212, so that a part of the flexible membrane 3 is deformed toward the placement surface 12 and closely adheres to the welding strip 22, and the welding strip 22 is deformed and contacts the part to be welded 211, and the direction close to the placement surface 12 is such as direction Z.

[0053] It should be noted that the term "portion to be welded 211" refers to the portion to be welded on the solar cell 21, such as the pad on the electrode. When the solar cell 21 is a back-contact solar cell, the insulating adhesive layer 213 is arranged around the periphery of the portion to be welded 211, and the insulating adhesive layer 213 is higher than the portion to be welded 211. The flexible film 3 is a thin film that deforms when subjected to force, such as an adhesive film. The flexible film 3 covering the photovoltaic component 2 to be processed means that the size of the flexible film 3 is larger than the photovoltaic component 2 to be processed, for example, the flexible film 3 is wider than the photovoltaic component 2 to be processed, and then covers the photovoltaic component 2 to be processed and the edge of the flexible film 3 protrudes relative to the photovoltaic component 2 to be processed, and the edge of the flexible film 3 fits the placement surface 12, which is equivalent to the photovoltaic component 2 to be processed being wrapped by the flexible film 3 and the placement surface 12. When the vacuum mechanism 15 forms a negative pressure between the flexible film 3 and the placement surface 12, the flexible film 3 fits the photovoltaic component 2 to be processed.

[0054] The exhaust mechanism 15 of the welding device 1 forms a negative pressure between the flexible membrane 3 and the placement surface 12. Under the action of the air pressure, the flexible membrane 3 is partially deformed toward the placement surface 12, so that the flexible membrane 3 is closely attached to the welding ribbon 22. The welding ribbon 22 is bent and deformed by the force. The welding ribbon 22 is deformed and contacts the part to be welded 211. The welding ribbon 22 and the part to be welded 211 form good contact, which is beneficial to improving the welding quality and reducing welding abnormalities such as cold welding.

[0055] Furthermore, if the residual gas in the gap 212 between the two solar cells 21 is not exhausted, it will cause the welded portion 211 on the edge of the solar cell 21 to be prone to welding abnormalities such as cold welding. The exhaust mechanism 15 is precisely to exhaust the gap 212 in a targeted manner to further reduce the probability of welding abnormalities in the welded portion 211 near the gap 212, that is, to reduce the probability of welding abnormalities at the edge of the solar cell 21.

[0056] In summary, the welding device 1 is connected to the gap 212 between the two solar cells 21 through the exhaust mechanism 15, and a negative pressure is formed between the flexible membrane 3 and the placement surface 12 through the gap 212, which can not only ensure good contact between the welding strip 22 and the part to be welded 211 to improve the welding quality, but also particularly reduce the probability of welding abnormalities in the part to be welded 211 at the edge of the solar cell 21.

[0057] In some embodiments, please refer to Figures 1 to 3 , a plurality of air-guiding channels 13 are provided on the placement surface 12, each of which is configured to communicate with the gap 212, and each of the air-extraction mechanisms 15 is respectively communicated with each of the air-guiding channels 13. Optionally, the air-guiding channels 13 may be air-guiding grooves, air-guiding holes, air-guiding ducts, or air-guiding cavities. Since the flexible film 3 covers the photovoltaic module 2 to be processed, that is, the flexible film 3 covers the gap 212, the air in the gap 212 is difficult to be discharged like an airbag. The air-guiding channels 13 are used to discharge the air in the gap 212, so that the air-extraction mechanism 15 is connected to the gap 212 so that the air-extraction mechanism 15 can vacuum the gap 212.

[0058] Alternatively, please continue to refer to Figures 1 to 3 , multiple air guide channels 13 are symmetrically arranged on two opposite sides of the placement surface 12, and multiple air guide channels 13 located on the same side of the placement surface 12 are spaced apart, and each air guide channel 13 is configured to be connected to multiple gaps 212. Since each exhaust mechanism 15 is respectively connected to each air guide channel 13, the multiple exhaust mechanisms 15 are also correspondingly symmetrically arranged on two opposite sides of the placement surface 12. The exhaust mechanisms 15 on both sides respectively exhaust the two ends of the gap 212 through the air guide channels 13 on both sides, thereby avoiding the problem of insufficient vacuum at one end of the gap 212, thereby making the vacuuming effect at various places in the gap 212 uniformly good, which is conducive to improving the welding effect. In more detail, for example, when multiple solar cells 21 on the photovoltaic module 2 to be processed are spaced apart along a certain direction, for example, in Figure 3 In the embodiment, multiple solar cells 21 are spaced apart along the X-axis, and multiple gaps 212 are spaced apart along the X-axis. The exhaust mechanism 15 communicates with the multiple gaps 212 via a gas channel 13. That is, a gas channel 13 is provided on the placement surface 12 for every interval of multiple gaps 212, thereby simplifying the structure of the welding device 1.

[0059] Alternatively, as Figure 3 As shown, the air guide channel 13 is a strip-shaped air guide groove, and each air guide groove is configured to be located on the same straight line as one of the gaps 212 to reduce air flow resistance and allow the air in the gap 212 to be quickly introduced into the air guide groove. Figure 3 In the Y-axis direction, the air guide channel 13 and one of the gaps 212 are located on the same straight line.

[0060] Furthermore, please combine Figure 2 and Figure 5 The air guide groove has a first air extraction section 131 and a second air extraction section 132 that are interconnected. The first air extraction section 131 is configured to be located within the coverage area of ​​the photovoltaic module 2 to be processed, thereby removing air between the photovoltaic module 2 and the placement surface 12, thereby adhering to the placement surface 12. The second air extraction section 132 is configured to be located within the coverage area of ​​the flexible film 3 surrounding the photovoltaic module 2 to be processed. Each air extraction mechanism 15 is connected to a respective second air extraction section 132. It can be understood that the flexible film 3 covers the photovoltaic module 2 to be processed, and the edge of the flexible film 3 abuts the placement surface 12. The photovoltaic module 2 to be processed has a certain thickness, resulting in a gap between the flexible film 3 surrounding the photovoltaic module 2 and the placement surface 12. The second air extraction section 132 is located within the coverage area of ​​the flexible film 3 surrounding the photovoltaic module 2 to be processed. This gap allows the second air extraction section 132 to connect to the gap 212 in the photovoltaic module 2 to be processed, allowing the air extraction mechanism 15 to extract air from the gap 212 through the second air extraction section 132.

[0061] Alternatively, refer to Figures 1 to 3 The placement surface 12 is further provided with a collecting recess 14, which is in communication with the air guide channel 13 and is positioned within the coverage of the flexible membrane 3 surrounding the photovoltaic module 2 to be processed. The air extraction mechanism 15 includes a movable member 151 disposed within the collecting recess 14 and configured to move along the depth of the collecting recess 14. The movable member 151 is provided with a first air extraction hole 152, which is configured to extract air from the collecting recess 14.

[0062] When the photovoltaic modules 2 to be processed are transferred to the placement surface 12, the movable member 151 moves along the depth direction of the collecting recess 14 until the movable member 151 is flush with the placement surface 12, thereby reducing the risk of the photovoltaic modules 2 to be processed being stuck in the collecting recess 14 during loading. After the photovoltaic modules 2 to be processed are loaded, the movable member 151 moves along the depth direction of the collecting recess 14 and retracts into the collecting recess 14, and the collecting recess 14 resumes its gas collection function.

[0063] Alternatively, as Figure 2 and Figure 3As shown, the air extraction mechanism 15 further includes a power element 153, which is connected to the movable member 151 and is configured to drive the movable member 151 to move. Optionally, the power element 153 may be a pneumatic cylinder, an oil cylinder, or a motor 196. For example, a pneumatic cylinder has a piston rod fixedly connected to the movable member 151, and the piston rod is extended and retracted to drive the movable member 151 to move.

[0064] Alternatively, as Figure 2 and Figure 3 As shown, the movable member 151 is a movable block, the collecting recess 14 is a collecting groove, and the movable block and the collecting groove are matched with each other through a gap 212. There is good airtightness between the movable block and the collecting groove, so that the collecting groove is isolated from the external environment as much as possible, which is conducive to rapid completion of air extraction and a more stable vacuum degree after the air extraction is completed.

[0065] Alternatively, as Figure 3 As shown, the collecting recess 14 is strip-shaped, and the length direction of the collecting recess 14 is perpendicular to the length direction of the air guide channel 13. The air guide channel 13 is connected to the middle of the collecting recess 14. Figure 3 In the embodiment, the longitudinal direction of the collecting recess 14 is the X-axis direction, the longitudinal direction of the air guide channel 13 is the Y-axis direction, and the X-axis direction is perpendicular to the Y-axis direction.

[0066] Alternatively, as Figure 2 and Figure 3 As shown, there are two first air extraction holes 152, one at each end of the movable block, to evacuate the multiple gaps 212. Furthermore, since the air guide channel 13 is connected to the middle of the collecting recess 14, the movable block cooperates with the collecting recess gap 212, i.e., the two ends of the movable block correspond to the two ends of the collecting recess. The two first air extraction holes 152 form three suction areas at the ends of the collecting recess 14 and the middle of the air guide channel 13, which facilitates the air extraction mechanism 15 to evacuate the multiple gaps 212.

[0067] Alternatively, as Figure 2 As shown, the first air extraction hole 152 penetrates the movable member 151 along the depth direction of the collecting recess 14, so that the vacuum extraction device can communicate with the first air extraction hole 152 from the other side of the movable member 151. The air inlet of the first air extraction hole 152 is located on the side of the movable member 151 facing the placement surface 12. When the movable member 151 is retracted into the collecting recess 14, the side of the movable member 151 facing the placement surface 12 constitutes the wall surface of the collecting recess 14, such as the bottom wall surface. The first air extraction hole 152 is located on this wall surface of the collecting recess 14 to facilitate air extraction.

[0068] In some embodiments, please refer to Figures 1 to 5The welding device 1 further includes a stopper 16. Optionally, the stopper 16 may be a stopper or a bump. Multiple stoppers 16 are disposed on opposite sides of the placement surface 12, and are configured to block opposite sides of the photovoltaic assembly 2 to be processed. It is understood that the stoppers 16 limit the photovoltaic assembly 2 to be processed, ensuring that the photovoltaic assembly 2 to be processed is placed in a predetermined position. More specifically, the stoppers 16 are used to block opposite sides of the light-transmitting panel 23.

[0069] Furthermore, please combine Figure 2 and Figure 5 The limiting member 16 is provided with a second exhaust hole 161. The limiting member 16 is also configured to be located within the coverage range of the flexible membrane 3. The second exhaust hole 161 is configured to form a negative pressure between the flexible membrane 3 and the placement surface 12. It can be understood that since the limiting member 16 is located outside the photovoltaic module 2 to be processed when blocking the photovoltaic module 2 to be processed, that is, the limiting member 16 is necessarily outside the coverage range of the photovoltaic module 2 to be processed, and is also located within the coverage range of the flexible membrane 3, it can thus extract air between the flexible membranes 3 and the flexible membranes 3. The welding device 1 is provided with a second exhaust hole 161 on the limiting member 16 for exhaust, so as to further accelerate the exhaust rate and improve the vacuum level between the flexible membrane 3 and the placement surface 12. In other words, the limiting member 16 has both a limiting function and an exhaust function to simplify the structure of the welding device 1.

[0070] Alternatively, as Figure 5 As shown, the photovoltaic module 2 to be processed further includes a light-transmitting panel 23 and a module end adhesive film 24, the solar cell 21 is a back-contact solar cell 21, and the placement surface 12 is configured to sequentially stack the light-transmitting panel 23, the module end adhesive film 24, the back-contact solar cell, the welding ribbon 22 and the flexible film 3 in a direction away from the placement surface 12. Figure 5 The Z2 direction is shown in FIG. This welding device is used for full-panel photovoltaic module welding. The light-transmitting panel 23 and the module end film 24 are components of the front side of the photovoltaic module. The welding device utilizes the placement surface 12 to pre-place the light-transmitting panel 23 and the module end film 24 before welding. After welding the back-contact solar cells and the welding ribbon 22, a solar cell string is formed. After welding, the solar cell string is directly laminated with the light-transmitting panel 23 and the module end film 24, thereby improving the production efficiency of photovoltaic modules.

[0071] In some embodiments, as Figure 8As shown, the welding apparatus 1 further includes a plurality of conveyor belts 17, with portions of the conveyor belts 17 positioned on the placement surface 12. For example, a section of the top side of the conveyor belts 17 is positioned on and parallel to the placement surface 12. The conveyor belts 17 are configured to convey the photovoltaic modules 2 to be processed onto the placement surface 12. Specifically, the photovoltaic modules 2 to be processed are first placed on the conveyor belts 17 and then transported to the placement surface 12 by the conveyor belts 17. After welding, the resulting semi-finished photovoltaic modules remain in contact with the conveyor belts 17, allowing them to be removed from the placement surface 12.

[0072] More specifically, when the photovoltaic component 2 to be processed is conveyed on the conveyor belt 17, the light-transmitting panel is placed on the conveyor belt 17. The light-transmitting panel supports the component end film, solar cells and welding strips, so that the light-transmitting panel, component end film, back-contact solar cells and welding strips constitute the photovoltaic component 2 to be processed and are conveyed together to the placement surface 12.

[0073] like Figure 8 As shown, the welding device 1 also includes a plurality of lasers 18. The lasers 18 are arranged corresponding to the placement surface 12. The lasers 18 are configured to weld the soldering ribbon and the part to be welded through the flexible film 3. It can be understood that the flexible film 3 should be a light-transmitting film. The laser 18 is used for laser welding. The laser welding pulse intensity is high and the energy is concentrated. Therefore, the alloying requirements can be achieved by directly welding the soldering ribbon to the part to be welded. There is no need to use solder paste, which also saves the cost of solder paste. Compared with infrared welding, laser welding does not heat the entire surface of the solar cell, thereby preventing the solar cell from warping due to heat.

[0074] The processing flow of the welding device 1 is described below:

[0075] Loading: Refer to Figure 8 , the photovoltaic modules 2 to be processed are placed on the conveyor belt 17, and the conveyor belt 17 transports the photovoltaic modules 2 to be processed to the processing table 11, and the conveying direction is as follows Figure 8 At this time, the top surface of the movable member 151 is flush with the placement surface 12, preventing the photovoltaic assembly 2 to be processed from being stuck in the collecting recess.

[0076] Cover film: The flexible film 3 covers the photovoltaic module 2 to be processed. The movement direction of the flexible film 3 is as follows: Figure 8 The Z-axis direction.

[0077] Vacuuming: The movable part retracts into the collecting recess. The first and second evacuation holes draw air, and the vacuum level between the flexible membrane 3 and the placement surface 12 continues to increase and then stabilizes. The gas between the two solar cells flows through the air guide channel into the collecting recess, and the first evacuation hole continuously evacuates the collecting recess. Once the vacuum level between the flexible membrane 3 and the placement surface 12 stabilizes, evacuation continues for a period of time.

[0078] Laser welding: The laser 18 penetrates the flexible film 3 to weld the photovoltaic modules to be processed.

[0079] Unloading: After welding is completed, the flexible film 3 is vacuumed and then removed. The conveyor belt 17 continues to deliver the welded photovoltaic modules downward along the X-axis direction.

[0080] Optionally, refer to Figure 8 and Figure 9 The welding device 1 further includes a displacement drive mechanism 19, which drives and connects a plurality of lasers 18. The displacement drive mechanism 19 is configured to drive the plurality of lasers 18 to move in a direction parallel to the placement surface 12, for example Figure 8 The laser 18 is moved relative to the photovoltaic module 2 to perform laser welding on the multiple solar cells. This is done by a displacement drive mechanism 19, which moves the laser 18 relative to the photovoltaic module 2 to be processed. In other words, during laser welding, the photovoltaic module 2 to be processed can be placed stationary on the placement surface 12, with the various components of the photovoltaic module 2 relatively fixed, facilitating welding.

[0081] Exemplarily, the displacement drive mechanism 19 includes two slide rails 191, a slider 192, a gantry 193, a rack 194, a mounting plate 195, and a motor 196. The two slide rails 191 are disposed on either side of the processing table 11, and the rack 194 is disposed parallel to one of the slide rails 191. The gantry 193 is mounted on the processing table 11, with its ends slidably connected to the two slide rails 191 via sliders 192. The gantry 193 is mounted on the processing table 11, and the laser 18 is mounted on the gantry 193. A mounting plate 195 is disposed at either end of the gantry 193, and a motor 196 is disposed on the mounting plate 195. A gear 197 is disposed on the output shaft of the motor 196, and the gear 197 meshes with the rack 194. When the motor 196 drives the gear 197 to rotate, the gear 197 linearly displaces along the extension direction of the rack 194, thereby driving the gantry 193 to slide along the slide rails 191. As another example, the displacement driving mechanism 19 may also be a linear displacement mechanism such as a screw-nut mechanism.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A photovoltaic module welding device, characterized in that: include: a processing table having a placement surface configured to sequentially stack photovoltaic modules to be processed and a flexible film in a direction away from the placement surface, the flexible film covering the photovoltaic modules to be processed with an edge of the flexible film abutting the placement surface, the photovoltaic modules to be processed comprising solar cells and welding ribbons, each solar cell having a portion to be welded, the welding ribbon being located between the flexible film and the portion to be welded, the plurality of solar cells being spaced apart with a gap between adjacent ones; and and a plurality of exhaust mechanisms, each of which is configured to communicate with a plurality of the gaps and form a negative pressure between the flexible membrane and the placement surface through the gaps, so that a portion of the flexible membrane is deformed toward the placement surface and closely adheres to the welding strip, and the welding strip is deformed and contacts the portion to be welded.

2. The welding device according to claim 1, characterized in that A plurality of air guiding channels are provided on the placement surface, each of the air guiding channels is configured to be communicated with the gap, and each of the air extraction mechanisms is respectively communicated with each of the air guiding channels.

3. The welding device according to claim 2, characterized in that The air guide channel is a strip-shaped air guide groove, and each of the air guide grooves is configured to be located on the same straight line as one of the gaps. The air guide groove has a first air pumping section and a second air pumping section that are connected to each other. The first air pumping section is configured to be located within the coverage range of the photovoltaic component to be processed, and the second air pumping section is configured to be located within the coverage range of the flexible membrane outside the photovoltaic component to be processed. Each of the air pumping mechanisms is respectively connected to each of the second air pumping sections.

4. The welding device according to claim 2, characterized in that The plurality of air guiding channels are symmetrically arranged on two opposite sides of the placement surface, the plurality of air guiding channels on the same side of the placement surface are spaced apart, and each air guiding channel is configured to communicate with the plurality of gaps.

5. The welding device according to claim 2, characterized in that The placement surface is further provided with a collecting recess, the collecting recess being in communication with the air guide channel, and the collecting recess being configured to be located within the coverage of the flexible film at the periphery of the photovoltaic assembly to be processed; The air extraction mechanism includes a movable part, which is arranged in the collecting recess and is configured to move along the depth direction of the collecting recess. A first air extraction hole is provided on the movable part, and the first air extraction hole is configured to extract air from the collecting recess.

6. The welding device according to claim 5, characterized in that The air extraction mechanism further includes a power element, the power element is connected to the movable part in a driving manner, and the power element is configured to drive the movable part to move; And / or, the movable member is a movable block, the collecting recess is a collecting groove, and the movable block is loosely fitted with the collecting groove; And / or, the collecting recess is strip-shaped, the length direction of the collecting recess is perpendicular to the length direction of the air guiding channel, and the air guiding channel is connected to the middle part of the collecting recess; And / or, the first air extraction hole penetrates the movable member along the depth direction of the collecting recess, and the air inlet of the first air extraction hole is located on a side of the movable member facing the placement surface; And / or, the number of the first air extraction holes is two, and the two first air extraction holes are respectively arranged at two ends of the movable block.

7. The welding device according to any one of claims 1 to 6, characterized in that The welding device further comprises: A limiting member, wherein a plurality of the limiting members are respectively arranged on two opposite sides of the placement surface, and the plurality of the limiting members are configured to limit and block the two opposite sides of the photovoltaic component to be processed; a second exhaust hole is provided on the limiting member, and the limiting member is also configured to be located within the coverage range of the flexible membrane, and the second exhaust hole is configured to form a negative pressure between the flexible membrane and the placement surface.

8. The welding device according to any one of claims 1 to 6, characterized in that The welding device further comprises: A plurality of conveyor belts are provided, wherein parts of the conveyor belts are located on the placement surface, and the conveyor belts are configured to convey the photovoltaic components to be processed to the placement surface.

9. The welding device according to any one of claims 1 to 6, characterized in that The welding device further comprises: a plurality of lasers, the lasers being disposed corresponding to the placement surface and configured to weld the welding ribbon and the portion to be welded through the flexible film; and A displacement driving mechanism is configured to drive the plurality of lasers to move in a direction parallel to the placement surface.

10. The welding device according to any one of claims 1 to 6, characterized in that The photovoltaic component to be processed also includes a light-transmitting panel and a component end film. The solar cell is a back-contact solar cell. The placement surface is configured to stack the light-transmitting panel, the component end film, the back-contact solar cell, the welding ribbon and the flexible film in sequence along a direction away from the placement surface.

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