A photovoltaic cell string soldering anti-false welding device and a soldering method

Abstract

The application discloses a kind of photovoltaic cell string welding false welding prevention device and welding method, belong to photovoltaic field, including fixed beam, fixed welding platform, mobile welding platform, drive mobile welding platform translation translation motor, drive mobile welding platform lifting lifting motor, exhaust hood and exhaust hood lifting motor, device also includes the auxiliary ballast device of preventing false welding.By additionally setting auxiliary ballast device, set up the movable pressing plate that can go up and down above pressure net, setting up press needle on pressing plate, press needle arrangement direction and position and the hollow long groove on pressure net correspond.In welding, press needle passes through the hollow long groove of pressure net and presses the solder strip, the part that is originally unable effectively ballast and easily appears false welding due to hollow position of pressure net is tightly pressed, greatly reduce the probability of false welding, improve welding quality, reduce the situation that whole string battery string is reworked even scrapped due to false welding.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a device and method for preventing false soldering during photovoltaic cell string welding. Background Technology

[0002] Photovoltaic cell string welding is a core process in photovoltaic module manufacturing, where multiple individual solar cells are connected in series using welding ribbons. It utilizes infrared, laser, or resistance heating technologies to fuse the welding ribbons to the main busbars of the solar cells, forming a robust connection. This process can increase the string voltage to practical levels while reducing resistance losses, enhancing connection strength, and improving module power generation efficiency and lifespan. Welding quality is affected by temperature, time, materials, and equipment precision, requiring strict control to avoid defects such as incomplete welds and cell cracking.

[0003] Conventional welding methods use a pressure mesh to firmly press the welding strip and the solar cell together during welding to prevent incomplete welds at the pressure points. However, before welding, the welding strip gripping mechanism must pass through the pressure mesh to grasp the welding strip, and the pressure mesh must have two long, open slots for the welding strip grippers to pass through. But at the open slots of the pressure mesh, effective pressure cannot be applied to the welding strip and the solar cell, resulting in incomplete welds at the corresponding slots. The probability of incomplete welds is high, leading to rework or even scrapping of the entire solar cell string, resulting in a significant waste of manpower and resources. To solve these problems, we propose a device and method for preventing incomplete welds in photovoltaic cell string welding. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that when welding photovoltaic cell strings, the welding strip and the cell cannot be effectively pressured at the mesh cutout position, resulting in a false weld at the corresponding position. Therefore, this invention proposes a photovoltaic cell string welding anti-false weld device and welding method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A photovoltaic cell string welding anti-poor welding device includes a fixed beam, a fixed welding platform, a movable welding platform, a translation motor for driving the movable welding platform to move horizontally, a lifting motor for driving the movable welding platform to move vertically, an exhaust hood, and an exhaust hood lifting motor. The fixed beam and the exhaust hood lifting motor are both mounted on an external frame. The exhaust hood lifting motor is connected to the exhaust hood and is used to drive the exhaust hood to move vertically. The translation motor is mounted on the fixed beam, and the lifting motor is mounted on the movable seat of the translation motor. The lifting motor is connected to the movable welding platform and drives the movable welding platform to move vertically.

[0006] The device also includes an auxiliary ballast device, which includes a vertically movable pressure plate and a pressure mesh. The pressure plate is provided with pressure pins, and the pressure mesh has a hollowed-out long groove. The arrangement direction and position of the pressure pins correspond to the hollowed-out long groove on the pressure mesh, and are used to descend and pass through the hollowed-out long groove to press down the welding strip during welding, so as to prevent incomplete welding.

[0007] Preferably, the fixed welding platform is provided with a heating device and a protrusion. The protrusion is a long strip structure that can pass through the hollow part of the movable welding platform to directly contact and heat the battery cell. The battery cell is covered with welding strips.

[0008] Preferably, the fixed welding platform is connected to the fixed beam via a heat insulation plate, which is used to prevent heat from being conducted to the fixed beam; the heating device includes a heating rod and a thermocouple to keep the fixed welding platform at a set temperature.

[0009] Preferably, the mobile welding platform is connected to a lifting motor, which is connected to a translation motor. The translation motor drives the lifting motor to translate, thereby driving the mobile welding platform to switch between the loading position, welding position, and unloading position in the translation direction; the lifting motor drives the mobile welding platform to switch between high position, medium position, and low position in the lifting direction.

[0010] Preferably, the mobile welding platform is provided with multiple hollowed-out long slots and multiple vacuum adsorption holes. The hollowed-out long slots allow the protrusions of the fixed welding platform to pass through, and the vacuum adsorption holes are used to adsorb the battery cells. The mobile welding platform is also provided with a preheating block, which is used to preheat the solder paste and solder strips on the battery cells. The mobile welding platform is also equipped with a vacuum connector to provide vacuum for the vacuum adsorption holes.

[0011] Preferably, the auxiliary ballast device is integrated on the exhaust hood, the pressure plate is a needle-type base plate, the needles are fixed on the pressure plate, and the distribution direction of the needles is consistent with the direction of the hollow long grooves of the pressure mesh, and the spacing between two adjacent rows of needles is equal to the spacing between adjacent hollow long grooves on the pressure mesh.

[0012] Preferably, the pressure mesh is positioned above the movable welding platform, and the pressure needle extends and retracts under the action of a spring to press the welding strip on the battery cell; the direction of the hollowed-out long groove is perpendicular to the length direction of the welding strip, and is used for the welding strip clamp to pass through.

[0013] Preferably, the system also includes a control unit for coordinating the movement of the translation motor, the lifting motor, and the exhaust hood lifting motor, so that the mobile welding platform cyclically moves between the loading position, the welding position, and the unloading position, and switches between high, medium, and low positions to achieve continuous loading, welding, and unloading operations. The control unit is configured as follows: In the initial state, both mobile welding platforms A and B are in the loading position, with platform A in the high position and platform B in the medium position; after platform A loads material, it moves to the welding position and descends to the low position for welding, while platform B rises to the high position for loading material; after platform A completes welding, it rises to the high position, moves to the unloading position for unloading material, while platform B moves to the welding position and descends to the low position for welding material; after platform A unloads material, it descends to the medium position, moves to the loading position, and rises to the high position for loading material, and so on, repeating the cycle.

[0014] Preferably, the exhaust hood is used to discharge organic waste gas generated during the welding process to avoid environmental pollution; the auxiliary ballast device operates synchronously when the exhaust hood descends, so that the pressure needle passes through the hollow long groove of the pressure mesh to ballast the welding strip.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention adds an auxiliary ballast device, which consists of a movable pressure plate above the pressure mesh. Pressure needles are mounted on the pressure plate, their arrangement and position corresponding to the perforated slots on the pressure mesh. During welding, the pressure needles pass through the perforated slots of the pressure mesh and press down on the welding strip, firmly compressing areas prone to incomplete welds due to the inability to effectively ballast the mesh. This significantly reduces the probability of incomplete welds, improves welding quality, and minimizes the need for rework or even scrapping of entire battery strings due to incomplete welds, thus saving manpower and material costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a photovoltaic cell string welding anti-cold soldering device proposed in this invention; Figure 2 This is a side view of a photovoltaic cell string welding anti-cold soldering device proposed in this invention; Figure 3 This is an enlarged schematic diagram of a portion of the structure of the fixed welding platform and the movable welding platform in a photovoltaic cell string welding anti-fragmentation device proposed in this invention. Figure 4 This is an enlarged schematic diagram of the auxiliary ballast device in a photovoltaic cell string welding anti-fraud welding device proposed in this invention; Figure 5 This is a schematic diagram of the auxiliary ballast device, pressure plate, and pressure mesh in a photovoltaic cell string welding anti-fraud welding device proposed in this invention; Figure 6 This is an enlarged schematic diagram of a portion of the structure of the fixed welding platform in a photovoltaic cell string welding anti-fraud welding device proposed in this invention; Figure 7 This is an enlarged schematic diagram of the moving welding platform in a photovoltaic cell string welding anti-cold soldering device proposed in this invention. Figure 1 ; Figure 8 This is an enlarged schematic diagram of the moving welding platform in a photovoltaic cell string welding anti-cold soldering device proposed in this invention. Figure 2 ; Figure 9 This is an enlarged cross-sectional view of a portion of the structure of the fixed welding platform and the movable welding platform in a photovoltaic cell string welding anti-fraud welding device proposed in this invention; Figure 10 This is an enlarged schematic diagram of the pressure pin in a photovoltaic cell string welding anti-cold soldering device proposed in this invention; Figure 11 This is an enlarged schematic diagram of the solar cells in a photovoltaic cell string welding anti-poor soldering device proposed in this invention.

[0017] In the diagram: 1. Fixed beam; 2. Fixed welding platform; 3. Moving welding platform; 4. Translation motor; 5. Lifting motor; 6. Exhaust hood; 7. Exhaust hood lifting motor; 8. Auxiliary ballast device; 9. Pressure plate; 10. Pressure pin; 11. Pressure mesh; 12. First hollowed-out long slot; 13. Protrusion; 14. Heat insulation plate; 15. Heating rod; 16. Thermocouple; 17. Second hollowed-out long slot; 18. Vacuum adsorption hole; 19. Preheating block; 20. Battery cell; 21. Solder paste; 22. Solder strip; 23. Spring. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example, refer to Figures 1 to 11 A photovoltaic cell string welding anti-false weld device includes a fixed beam 1, a fixed welding platform 2, a movable welding platform 3, a translation motor 4 for driving the movable welding platform 3 to move horizontally, a lifting motor 5 for driving the movable welding platform 3 to move vertically, an exhaust hood 6, and an exhaust hood lifting motor 7. The fixed beam 1 and the exhaust hood lifting motor 7 are both mounted on an external frame. The exhaust hood lifting motor 7 is connected to the exhaust hood 6 and is used to drive the exhaust hood 6 to move vertically. The translation motor 4 is mounted on the fixed beam 1, and the lifting motor 5 is mounted on the movable seat of the translation motor 4. The lifting motor 5 is connected to the movable welding platform 3 and drives the movable welding platform 3 to move vertically.

[0022] The device also includes an auxiliary ballast device 8, which includes a vertically movable pressure plate 9 and a pressure mesh 11. The pressure plate 9 is provided with pressure needles 10, and the pressure mesh 11 is provided with a first hollow long groove 12. The arrangement direction and position of the pressure needles 10 correspond to the first hollow long groove 12 on the pressure mesh 11. They are used to descend and pass through the first hollow long groove 12 to press down the welding strip 22 during welding to prevent incomplete welding.

[0023] The fixed welding platform 2 is equipped with a heating device and a protrusion 13. The protrusion 13 is a long strip structure that can pass through the hollow part on the movable welding platform 3 and can directly contact and heat the battery cell 20. The battery cell 20 is covered with a welding strip 22.

[0024] The fixed welding platform 2 is connected to the fixed beam 1 via a heat insulation plate 14, which is used to prevent heat from being conducted to the fixed beam 1. The heating device includes a heating rod 15 and a thermocouple 16 to keep the fixed welding platform 2 at a set temperature.

[0025] The mobile welding platform 3 is connected to the lifting motor 5, and the lifting motor 5 is connected to the translation motor 4. The translation motor 4 drives the lifting motor 5 to translate, thereby driving the mobile welding platform 3 to switch between the loading position, welding position and unloading position in the translation direction; the lifting motor 5 drives the mobile welding platform 3 to switch between high position, medium position and low position in the lifting direction.

[0026] The mobile welding platform 3 is provided with multiple second hollowed-out long slots 17 and multiple vacuum adsorption holes 18. The second hollowed-out long slots 17 allow the protrusions 13 of the fixed welding platform 2 to pass through, and the vacuum adsorption holes 18 are used to adsorb the battery cells 20. The mobile welding platform 3 is also provided with a preheating block 19, which is used to preheat the solder paste 21 and solder ribbon 22 on the battery cells 20. The mobile welding platform 3 is also equipped with a vacuum connector to provide vacuum to the vacuum adsorption holes 18.

[0027] The auxiliary ballast device 8 is integrated on the exhaust hood 6. The pressure plate 9 is a pressure needle type base plate. The pressure needles 10 are fixed on the pressure plate 9, and the distribution direction of the pressure needles 10 is consistent with the direction of the first hollow long groove 12 of the pressure mesh 11. The spacing between two adjacent rows of pressure needles 10 is equal to the spacing between adjacent first hollow long grooves 12 on the pressure mesh 11.

[0028] The pressure mesh 11 is positioned above the mobile welding platform 3. The pressure pin 10 extends and retracts under the action of the spring 23 to press the welding strip 22 on the battery cell 20. The direction of the first hollow long groove 12 is perpendicular to the length direction of the welding strip 22, and is used for the welding strip clamp to pass through.

[0029] It also includes a control unit for coordinating the movement of the translation motor 4, the lifting motor 5, and the exhaust hood lifting motor 7, so that the mobile welding platform 3 cyclically moves between the loading position, the welding position, and the unloading position, and switches between high, medium, and low positions to achieve continuous loading, welding, and unloading operations. The control unit is configured as follows: In the initial state, both mobile welding platforms A and B are in the loading position, with platform A in the high position and platform B in the medium position; after platform A loads, it moves to the welding position and descends to the low position for welding, while platform B rises to the high position for loading; after platform A completes welding, it rises to the high position, moves to the unloading position for unloading, while platform B moves to the welding position and descends to the low position for welding; after platform A unloads, it descends to the medium position, moves to the loading position, and rises to the high position for loading, and so on.

[0030] The exhaust hood 6 is used to discharge organic waste gas generated during the welding process to avoid environmental pollution; the auxiliary ballast device 8 operates synchronously when the exhaust hood 6 descends, so that the pressure needle 10 passes through the first hollow long groove 12 of the pressure mesh 11 to ballast the welding strip 22.

[0031] During the loading stage, at the loading position, a specialized device places the battery cell 20 and the welding ribbon 22 sequentially onto the mobile welding platform 3. Then, a pressure mesh 11 is used to initially press the welding ribbon 22 firmly onto the battery cell 20. At this time, the pressure pins 10 on the pressure mesh 11 can extend and retract under the action of the spring 23, and under the weight of the pressure mesh 11, they initially press onto the welding ribbon 22, making the welding ribbon 22 adhere to the battery cell 20. An auxiliary ballast device 8 is integrated into the exhaust hood 6. The pressure plate 9 is a pressure pin-type base plate, and the pressure pins 10 are fixed on the pressure plate 9. The distribution direction of the pressure pins 10 is consistent with the direction of the first hollowed-out long groove 12 of the pressure mesh 11, and the spacing between two adjacent rows of pressure pins 10 is equal to the spacing between adjacent first hollowed-out long grooves 12 on the pressure mesh 11. The pressure mesh 11 is positioned above the mobile welding platform 3, and the direction of the first hollowed-out long groove 12 is perpendicular to the length direction of the welding ribbon 22, allowing the welding ribbon clamps to pass through.

[0032] During the movement phase, the control unit coordinates the movements of the translation motor 4, the lifting motor 5, and the exhaust hood lifting motor 7. Initially, there are two mobile welding platforms 3A and 3B, both located at the loading position, with platform A at the high position and platform B at the middle position. After platform A is loaded, the translation motor 4 drives it to move to the welding position, while the lifting motor 5 drives it to descend to the low position. Simultaneously, platform B rises to the high position for loading.

[0033] During the welding stage, when the movable welding platform 3 reaches the welding position and is in a low position, the elongated structure of the protrusion 13 on the fixed welding platform 2 passes through the second hollowed-out long groove 17 on the movable welding platform 3, directly contacting and heating the battery cell 20. The fixed welding platform 2 is connected to the fixed beam 1 through a heat insulation plate 14 to prevent heat from being conducted to the fixed beam 1. Its heating device includes a heating rod 15 and a thermocouple 16 to maintain the fixed welding platform 2 at a set temperature.

[0034] The preheating block 19 on the mobile welding platform 3 preheats the solder paste 21 and solder ribbon 22 on the battery cell 20. Simultaneously, the exhaust hood 6 descends, and the auxiliary ballast device 8 operates synchronously. The pressure plate 9 moves downwards with the pressure needle 10, allowing the pressure needle 10 to pass through the first perforated slot 12 of the pressure mesh 11 and press against the solder ribbon 22 and battery cell 20 below, firmly pressing the solder ribbon 22 and battery cell 20 together to prevent cold solder joints. The high-temperature fixed welding platform 2 heats the battery cell 20 through thermal contact, melting the solder paste 21 above it, thereby welding the solder ribbon 22 and battery cell 20 together.

[0035] During the unloading phase, after welding is completed on platform A, lifting motor 5 drives it to a high position, and translation motor 4 drives it to move to the unloading position for unloading. At the same time, platform B moves to the welding position and descends to a low position for welding. After unloading, platform A descends to the middle position, moves to the loading position, and rises to a high position for loading again. This cycle is repeated to achieve continuous loading, welding, and unloading operations.

[0036] During the exhaust phase, exhaust hood 6 is used to discharge organic waste gas generated during the welding process to avoid environmental pollution.

[0037] By adding an auxiliary ballast device 8, a movable pressure plate 9 is set above the pressure mesh 11. Pressure pins 10 are set on the pressure plate 9, and the arrangement direction and position of the pressure pins 10 correspond to the hollowed-out long grooves on the pressure mesh 11. During welding, the pressure pins 10 pass through the hollowed-out long grooves of the pressure mesh 11 and press down on the welding strip 22, firmly pressing down the parts that were prone to poor welding due to the inability to effectively ballast the hollowed-out position of the pressure mesh 11. This greatly reduces the probability of poor welding, improves welding quality, and reduces the situation of rework or even scrapping of the entire battery string due to poor welding, saving manpower and material costs.

[0038] By coordinating the movement of the translation motor 4, the lifting motor 5, and the exhaust hood lifting motor 7 through the control unit, the two mobile welding platforms 3 can move cyclically between the loading position, the welding position, and the unloading position, and switch between high, medium, and low positions, enabling continuous loading, welding, and unloading operations, improving production efficiency and meeting the needs of large-scale production.

[0039] The fixed welding platform 2 is equipped with a heating device including a heating rod 15 and a thermocouple 16, which can maintain the set temperature. It directly contacts the heated battery cell 20 through the protrusion 13. At the same time, the preheating block 19 on the moving welding platform 3 preheats the solder paste 21 and the solder ribbon 22, making the welding process more stable and reliable and helping to improve the welding quality.

[0040] The exhaust hood 6 can discharge the organic waste gas generated during the welding process, avoiding environmental pollution and meeting environmental protection requirements.

[0041] As a preferred embodiment: A welding method for preventing cold solder joints in photovoltaic cell string welding includes the following steps: Feeding steps: At the feeding position, place the battery cells 20 on the mobile welding platform 3 in sequence, and use the pressure mesh 11 to initially press the welding strip onto the battery cells 20. At this time, the pressure pins 10 on the pressure mesh 11 can extend and retract up and down under the action of the spring, and under the action of the weight of the main body of the pressure mesh 11, they are initially pressed onto the welding strip, so that the welding strip and the battery cells are in contact. Movement steps: The control unit coordinates the movement of the translation motor 4, the lifting motor 5, and the exhaust hood lifting motor 7; the translation motor 4 drives the mobile welding platform 3 to move to the welding position, while the lifting motor 5 drives the mobile welding platform 3 to descend to the low position; at the same time, the loading operation is performed. Welding steps: When the mobile welding platform 3 reaches the welding position and is in a low position, the protrusion 13 on the fixed welding platform 2 passes through the second hollowed-out long groove 17 on the mobile welding platform 3, directly contacting and heating the battery cell 20; the preheating block 19 on the mobile welding platform 3 preheats the solder paste and solder strip on the battery cell 20; at the same time, the exhaust hood 6 descends, and the auxiliary ballast device 8 moves synchronously to firmly press the solder strip and battery cell at this position; the high-temperature fixed welding platform 2 heats the battery cell 20 through thermal contact, melting the solder paste on it, thereby welding the solder strip and battery cell 20 together; Material unloading steps: After welding is completed, the lifting motor 5 and the translation motor 4 drive the moving welding platform 3 to the unloading position for unloading; then it moves to the loading position, and so on, to achieve continuous loading, welding and unloading operations.

[0042] Because the heating plate on the fixed welding platform 2 is too narrow, the contact area with the battery is too small, resulting in low heating efficiency, unstable heating leading to poor welding results, prolonged heating time, and reduced production capacity. This can be addressed by thickening the heating plate on the fixed welding platform 2.

[0043] With a thicker heating plate, more heating elements, such as heating rods 15, can be accommodated inside, resulting in a larger heat capacity and better heat storage and release. At the same power, more heating elements can transfer heat to the surface of the heating plate more quickly, and then to the solar cell 20, allowing the solar cell 20 to reach the welding temperature more quickly, significantly improving heating efficiency and reducing preheating waiting time.

[0044] The fixed welding platform 2 dissipates heat faster at the edges and slower in the center, resulting in a consistently higher temperature in the center compared to the edges. This causes the edges to be prone to incomplete welds due to their lower temperature. By adjusting the heating plate of the protrusion 13 to 90° and the heating rod 15 to 90°, the heating rod 15 is positioned in the area with faster heat dissipation at the edges to provide separate heating for the edge areas.

[0045] The current welding method uses a fixed welding platform 2, which is a single piece made of aluminum, and the welding contact surface is untreated. This results in uneven temperature distribution across different areas of the fixed welding platform 2, leading to incomplete welds in some areas. This uneven welding temperature is mainly due to two reasons: First, although aluminum, as a metal, has relatively high thermal conductivity, it still cannot achieve an even temperature distribution across all areas. This is because its thermal conductivity is insufficient to quickly transfer heat from high-temperature areas to low-temperature areas. Second, aluminum readily oxidizes to form an aluminum oxide layer, which has very low thermal conductivity, easily causing uneven welding temperatures at the contact surface or preventing timely replenishment of welding heat.

[0046] Therefore, a special material, PGS, is embedded in the top of the welding station. This material has excellent thermal conductivity, which can instantly smooth out temperature differences between different areas of the welding surface, avoiding unstable welding quality caused by uneven temperature distribution in different welding areas. PGS can be embedded in the upper surface of the strip heating plate of the fixed welding platform 2; alternatively, a hole can be drilled near the surface to insert PGS like a heating rod 15. The above improvement scheme can solve the problems of uneven welding station temperature and untimely welding heat replenishment.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A false soldering prevention device for string soldering of a photovoltaic cell, characterized by, The system includes a fixed beam (1), a fixed welding platform (2), a mobile welding platform (3), a translation motor (4) for driving the mobile welding platform (3) to move horizontally, a lifting motor (5) for driving the mobile welding platform (3) to move vertically, an exhaust hood (6), and an exhaust hood lifting motor (7). The fixed beam (1) and the exhaust hood lifting motor (7) are both mounted on an external frame. The exhaust hood lifting motor (7) is connected to the exhaust hood (6) and is used to drive the exhaust hood (6) to move vertically. The translation motor (4) is mounted on the fixed beam (1). The lifting motor (5) is mounted on the movable seat of the translation motor (4). The lifting motor (5) is connected to the mobile welding platform (3) and drives the mobile welding platform (3) to move vertically. The device also includes an auxiliary ballast device (8), which includes a vertically movable pressure plate (9) and a pressure mesh (11). The pressure plate (9) is provided with pressure needles (10), and the pressure mesh (11) is provided with a first hollow long groove (12). The arrangement direction and position of the pressure needles (10) correspond to the first hollow long groove (12) on the pressure mesh (11), and are used to descend and pass through the first hollow long groove (12) during welding to press down the welding strip to prevent incomplete welding. The fixed welding platform (2) is provided with a heating device and a protrusion (13). The protrusion (13) is a long strip structure. The protrusion (13) can pass through the hollow part on the mobile welding platform (3) to directly contact and heat the battery cell (20). The battery cell (20) is covered with welding strips. The mobile welding platform (3) is connected to the lifting motor (5), and the lifting motor (5) is connected to the translation motor (4). The translation motor (4) drives the lifting motor (5) to translate, thereby driving the mobile welding platform (3) to switch between the loading position, welding position and unloading position in the translation direction; the lifting motor (5) drives the mobile welding platform (3) to switch between the high position, middle position and low position in the lifting direction.

2. A false soldering prevention device for series welding of a photovoltaic cell according to claim 1, characterized in that, The fixed welding platform (2) is connected to the fixed beam (1) via a heat insulation plate (14), which is used to prevent heat from being conducted to the fixed beam (1); the heating device includes a heating rod (15) and a thermocouple (16) to keep the fixed welding platform (2) at a set temperature.

3. The photovoltaic cell string welding anti-cold soldering device according to claim 2, characterized in that, The mobile welding platform (3) is provided with multiple second hollow long slots (17), which are the hollow parts on the mobile welding platform (3). The mobile welding platform (3) is provided with multiple vacuum adsorption holes (18). The second hollow long slots (17) allow the protrusions (13) of the fixed welding platform (2) to pass through. The vacuum adsorption holes (18) are used to adsorb the battery cells (20). The mobile welding platform (3) is also provided with a preheating block (19), which is used to preheat the solder paste and solder strip on the battery cells (20). The mobile welding platform (3) is also equipped with a vacuum connector to provide vacuum to the vacuum adsorption holes (18).

4. The photovoltaic cell string welding anti-cold soldering device according to claim 3, characterized in that, The auxiliary ballast device (8) is integrated on the exhaust hood (6). The pressure plate (9) is a pressure needle type base plate. The pressure needles (10) are fixed on the pressure plate (9). The distribution direction of the pressure needles (10) is consistent with the direction of the first hollow long groove (12) of the pressure mesh (11). The distance between two adjacent rows of pressure needles (10) is equal to the distance between adjacent first hollow long grooves (12) on the pressure mesh (11).

5. The photovoltaic cell string welding anti-cold soldering device according to claim 4, characterized in that, The pressure mesh (11) is set above the mobile welding platform (3). The pressure needle (10) extends and retracts under the action of the spring (23) to press the welding strip on the battery cell (20). The direction of the first hollow long groove (12) is perpendicular to the length direction of the welding strip and is used for the welding strip clamp to pass through.

6. The photovoltaic cell string welding anti-cold soldering device according to claim 5, characterized in that, It also includes a control unit for coordinating the movement of the translation motor (4), the lifting motor (5) and the exhaust hood lifting motor (7) so that the mobile welding platform (3) moves cyclically between the loading position, the welding position and the unloading position, and switches between the high position, the middle position and the low position to realize continuous loading, welding and unloading operations.

7. The photovoltaic cell string welding anti-cold soldering device according to claim 6, characterized in that, The exhaust hood (6) is used to discharge organic waste gas generated during the welding process to avoid environmental pollution; the auxiliary ballast device (8) operates synchronously when the exhaust hood (6) descends, so that the pressure needle (10) passes through the first hollow long groove (12) of the pressure mesh (11) to ballast the welding strip.

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