Photovoltaic main-grid-free battery series welding device

Abstract

The utility model provides a photovoltaic main-grid-free battery series welding device, and relates to the technical field of photovoltaic module manufacturing, the photovoltaic main-grid-free battery series welding device comprises a machine frame, a conveying device is installed on the machine frame, a welding strip feeding device comprises a welding strip supply mechanism and a welding strip compensation mechanism, the welding strip supply mechanism comprises a welding strip base, a supply motor, a supply rotating shaft and a welding strip supply disc, and the welding strip compensation mechanism is installed on the welding strip base. A detection beam rod is fixed right above the supply rotating shaft, a pressure sensor is fixed on the detection beam rod, the end part of the detection beam rod is rotatably connected with an abutting support, the detection beam rod is sleeved with an abutting torsional spring, the lower end of the abutting support is rotatably connected with an abutting wheel, and the abutting wheel abuts against the outer edge of the welding strip feeding disc. According to the utility model, the solder strip feeding disc can be propped through the propping support rod so as to detect the solder strip surplus on the solder strip feeding disc, and the solder strip compensation mechanism is controlled to clamp the solder strip, so that shutdown threading caused by excessive advancing of the solder strip is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic component manufacturing, in particular to a photovoltaic main grid-free battery string welding device. Background Art

[0002] Busbarless photovoltaic cells are a new type of solar cell designed on the basis of conventional solar cells. They reduce the series resistance by shortening the carrier transport path, thereby increasing the front light-receiving area, improving the component power, increasing the short-circuit current, and reducing the use of silver paste for grid line printing to reduce production costs.

[0003] The voltage of a single photovoltaic cell is typically around 0.5V, far below the voltage required for practical use. Through string welding, multiple photovoltaic cells can be connected in series to form a high-voltage busbar-less photovoltaic panel. String welding machines use resistance welding technology, applying pressure between the cells and heating them with an electric current to create a tight bond between the welding tips and the cell surface. This method not only increases the voltage and current output of the solar panel, but also enhances the panel's stability and conversion efficiency.

[0004] In a typical ribbon loading system, multiple pre-cut ribbon assemblies are placed at a loading station on a production conveyor, with ribbon loading coordinated and alternating with cell loading. Current stringing machines utilize fully automated welding, but the ribbon length on a single roll is limited. Failure to replace the ribbon promptly necessitates manual rethreading, and replacing the ribbon assembly often requires downtime, impacting productivity. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a photovoltaic busbar-less battery string welding device, which solves the problems raised in the above background technology.

[0007] (2) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A photovoltaic main grid-free battery string welding device includes a frame, on which a battery cell loading device, a welding strip loading device, a conveying device and a welding device are installed. The welding strip loading device includes a welding strip feeding mechanism and a welding strip compensation mechanism. The welding strip feeding mechanism includes a welding strip base fixed on the frame, a plurality of supply motors fixed on the welding strip base, a supply shaft rotatably connected to the output end of the supply motor and a welding strip supply tray plugged into the supply shaft. A detection beam is fixed directly above the supply shaft, a pressure sensor is fixed on the detection beam, and the end of the detection beam is rotatably connected to a resistance bracket. A resistance torsion spring is sleeved on the detection beam, and the two ends of the resistance torsion spring are respectively connected to the pressure sensor and the resistance bracket. The lower end of the resistance bracket is rotatably connected to a resistance wheel, and the resistance wheel resists the outer edge of the welding strip supply tray.

[0010] Preferably, the welding strip compensation mechanism includes a positioning frame, a fixed gate is provided on the lower edge of the positioning frame, vertical slide rails are provided on both sides of the positioning frame, a sliding gate is slidably connected to the vertical slide rails, a clamping cylinder is fixed on the lower side of the positioning frame, the sliding gate is fixed on the cylinder arm of the clamping cylinder, and the clamping cylinder is electrically connected to the pressure sensor.

[0011] Preferably, a guide beam is provided on the lower side of the welding strip base, and a plurality of guide wheels are sleeved on the guide beam, and the lower edge of the guide wheel is flush with the lower side of the fixed gate.

[0012] Preferably, the welding strip compensation mechanism also includes two symmetrically arranged compensation beams, a sliding arc groove is provided on the welding strip base, the circle of the sliding arc groove coincides with the axis of the compensation beam, the sliding arc groove is symmetrically arranged on the periphery of the compensation beam, a sliding beam is slidingly connected in the sliding arc groove, and compensation guide wheels are both provided on the compensation beam and the sliding beam.

[0013] Preferably, the welding strip base is rotatably connected to two driving gears, the axis of the driving gears coincides with the axis of the compensation beam, and a sliding link is provided on the driving gear, and the end of the sliding beam is fixed on the sliding beam.

[0014] Preferably, a bidirectional rack is rotatably connected to the welding strip base, and the bidirectional rack is respectively engaged with the two driving gears. A driving cylinder is provided on the welding strip base, and the cylinder arm of the driving cylinder is connected to the lower end of the bidirectional rack. The driving cylinder is electrically connected to the pressure sensor.

[0015] Preferably, a sliding groove is provided at the bottom of the welding strip base, and the driving rack is slidingly connected in the sliding groove.

[0016] (3) Beneficial effects

[0017] The utility model provides a photovoltaic busbar-free battery string welding device, which has the following beneficial effects:

[0018] 1. In the present invention, the welding tape passes through the guide beam, the compensation beam and the sliding beam in sequence from the welding tape feeding tray. The contact wheel of the contact bracket contacts the outer edge of the welding tape feeding tray. As the welding tape decreases, the contact bracket squeezes the pressure sensor through the contact torsion spring, triggering the clamping cylinder to extend, clamping the welding tape, and driving the sliding beam to rotate in the sliding arc groove through the driving cylinder. During the rotation, the winding length of the welding tape gradually shortens to compensate for the supply length required by the string welding device. The replacement of the welding tape feeding tray and the winding process of the welding tape end can be completed in this process, ensuring that the welding tape feeding tray can be replaced without stopping the machine during the fully automatic welding process, avoiding the operation of re-threading. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a photovoltaic busbar-free battery string welding device according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the welding strip feeding mechanism in the utility model. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the structure of the welding strip feeding mechanism in the utility model. Figure 2 .

[0022] In the figure: 1. Frame; 2. Welding strip base; 3. Supply motor; 4. Supply shaft; 5. Welding strip supply tray; 6. Pressure sensor; 7. Resistance bracket; 8. Resistance torsion spring; 9. Resistance wheel; 10. Positioning frame; 11. Fixed gate; 12. Guide beam; 13. Sliding gate; 14. Clamping cylinder; 15. Compensating beam; 16. Sliding arc groove; 17. Sliding beam; 18. Driving gear; 19. Sliding beam; 20. Detection beam; 21. Bidirectional rack; 22. Driving cylinder. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] The present invention provides a photovoltaic busbar-free battery string welding device.

[0025] like Figure 1 , including a frame 1, on which are installed a battery cell loading device, a welding strip loading device, a conveying device and a welding device. The welding strip loading device includes a welding strip feeding mechanism and a welding strip compensation mechanism.

[0026] like Figure 2 、 3As shown, the welding strip feeding mechanism includes a welding strip base 2 fixed on the frame 1, the welding strip base 2 includes a base bottom plate and a base vertical plate, the base bottom plate is fixed on the frame 1, and several feeding motors 3 are fixed on the welding strip base 2, the feeding motor 3 is fixed on the base vertical plate, and is rotatably connected to the feeding shaft 4 at the output end of the feeding motor 3, and a limiting slide is provided on the outer wall of the feeding shaft 4, and the limiting slide is horizontally arranged on the feeding shaft 4, the welding strip feeding tray 5 is slidingly sleeved on the feeding shaft 4, and a limiting slider is provided on the inner wall of the welding strip feeding tray 5, and the limiting slider is slidably inserted in the limiting slide, and the limiting slider and the limiting slide are clamped with each other in the circumferential direction, so that the welding strip feeding tray 5 can rotate synchronously with the feeding shaft 4 during the process of the feeding motor 3 driving the feeding shaft 4 to rotate, so as to avoid slipping.

[0027] A detection beam 20 is fixed just above the supply shaft 4, and a pressure sensor 6 is fixed on the detection beam 20. The end of the detection beam 20 is rotatably connected to a resistance bracket 7. A resistance torsion spring 8 is sleeved on the detection beam 20, and the two ends of the resistance torsion spring 8 are respectively connected to the pressure sensor 6 and the resistance bracket 7. The lower end of the resistance bracket 7 is rotatably connected to a resistance wheel 9, and the resistance wheel 9 is in contact with the outer edge of the welding strip feeding disk 5. The resistance torsion spring 8 can make the resistance bracket 7 always in contact with the welding strip of the welding strip feeding disk 5. As the welding strip on the welding strip feeding disk 5 gradually decreases, the resistance bracket 7 will rotate. As the resistance bracket 7 rotates, the pressure of the resistance torsion spring 8 on the pressure sensor 6 will gradually decrease, and the remaining amount of welding strip on the welding strip feeding disk 5 can be determined.

[0028] like Figure 2 As shown, the welding strip compensation mechanism includes a positioning frame 10, a fixed gate 11 is provided on the lower edge of the positioning frame 10, a guide beam 12 is provided on the lower side of the welding strip base 2, a plurality of guide wheels are sleeved on the guide beam 12, and the lower edge of the guide wheel is flush with the lower side of the fixed gate 11, vertical slide rails are provided on both sides of the positioning frame 10, and a sliding gate 13 is slidably connected to the vertical slide rails, and a clamping cylinder 14 is fixed on the lower side of the positioning frame. It is fixed on the cylinder arm of the clamping cylinder 14, and the clamping cylinder 14 is electrically connected to the pressure sensor 6. When the pressure sensor 6 determines that the remaining amount of solder strip on the solder strip feeding tray 5 reaches the replacement critical value, the clamping cylinder 14 is driven to extend, so that the sliding gate 13 contacts the fixed gate 11 to clamp the solder strip, and clamp the end of the solder strip to avoid the solder strip feeding tray 5 being replaced in time, causing the end of the solder strip to continue to move forward and be used up, resulting in untimely feeding of subsequent welding work, and then the need to stop the machine for threading operation, affecting work efficiency.

[0029] The welding strip compensation mechanism also includes two symmetrically arranged compensation beams 15, the height of the compensation beam 15 is consistent with the height of the guide beam 12, and a sliding arc groove 16 is provided on the welding strip base 2, the circular shape of the sliding arc groove 16 coincides with the axis of the compensation beam 15, and the sliding arc groove 16 is symmetrically arranged on the periphery of the compensation beam 15, and a sliding beam 17 is slidingly connected in the sliding arc groove 16, and the compensation beam 15 and the sliding beam 17 are both provided with compensation guide wheels, and the sliding beam 17 slides in the sliding arc groove 16, and the position change of the compensation beam 15 and the sliding beam 17 causes the length of the welding strip wound on the compensation beam 15 and the sliding beam 17 to change, and the length of the welding strip gradually decreases in the process of the sliding beam 17 gradually keeping the angle of the compensation beam 15 flush, so as to provide the welding strip length required for the string welding device to continue working during the replacement of the welding strip feeding tray 5 after clamping the end of the welding strip.

[0030] like Figure 3 As shown, the welding strip base 2 is rotatably connected to two driving gears 18, and the axis of the driving gear 18 coincides with the axis of the compensation beam 15. A sliding link 19 is provided on the driving gear 18, and the sliding link 19 is provided on the inner side of the driving gear 18. The end of the sliding link 19 is fixed on the sliding beam 17. The welding strip base 2 is rotatably connected to a bidirectional rack 21, and the bidirectional rack 21 is respectively engaged with the two driving gears 18. The welding strip base 2 is provided with a driving cylinder 19, and the cylinder arm of the driving cylinder 22 is connected to the lower end of the bidirectional rack 21. The middle part of the bidirectional rack 21 is provided with a sliding slot hole, and the welding strip base 2 is provided with a guide slider, and the guide slider slides through the sliding slot hole. The driving cylinder 22 is electrically connected to the pressure sensor 6, and the end of the welding strip is clamped.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic busbarless battery string welding device, comprising a frame, on which are mounted a battery cell loading device, a welding ribbon loading device, a conveying device, and a welding device, characterized in that: The welding strip feeding device includes a welding strip feeding mechanism and a welding strip compensation mechanism. The welding strip feeding mechanism includes a welding strip base fixed on the frame, a plurality of feeding motors fixed on the welding strip base, a feeding shaft rotatably connected to the output end of the feeding motor, and a welding strip feeding tray plugged into the feeding shaft. A detection beam is fixed directly above the feeding shaft, a pressure sensor is fixed on the detection beam, and the end of the detection beam is rotatably connected to a resistance bracket. A resistance torsion spring is sleeved on the detection beam, and the two ends of the resistance torsion spring are respectively connected to the pressure sensor and the resistance bracket. The lower end of the resistance bracket is rotatably connected to a resistance wheel, and the resistance wheel resists the outer edge of the welding strip feeding tray.

2. A photovoltaic busbar-less battery string welding device according to claim 1, characterized in that: The welding strip compensation mechanism includes a positioning frame, a fixed gate is provided on the lower edge of the positioning frame, vertical slide rails are provided on both sides of the positioning frame, a sliding gate is slidably connected to the vertical slide rails, a clamping cylinder is fixed on the lower side of the positioning frame, the sliding gate is fixed on the cylinder arm of the clamping cylinder, and the clamping cylinder is electrically connected to the pressure sensor.

3. The photovoltaic busbar-less battery string welding device according to claim 2, characterized in that: A guide beam is provided on the lower side of the welding strip base, and a plurality of guide wheels are sleeved on the guide beam. The lower edge of the guide wheel is flush with the lower side of the fixed gate.

4. The photovoltaic busbar-less battery string welding device according to claim 3, characterized in that: The welding strip compensation mechanism also includes two symmetrically arranged compensation beams. A sliding arc groove is provided on the welding strip base. The circular shape of the sliding arc groove coincides with the axis of the compensation beam. The sliding arc groove is symmetrically arranged on the periphery of the compensation beam. A sliding beam is slidingly connected in the sliding arc groove. Compensation guide wheels are both provided on the compensation beam and the sliding beam.

5. The photovoltaic busbar-less battery string welding device according to claim 4, characterized in that: The welding strip base is rotatably connected to two driving gears, the axis of the driving gears coincides with the axis of the compensation beam, and a sliding connecting rod is provided on the driving gear, and the end of the sliding beam is fixed on the sliding beam.

6. The photovoltaic busbar-less battery string welding device according to claim 5, characterized in that: A bidirectional rack is rotatably connected to the welding strip base, and the bidirectional rack is respectively engaged with the two driving gears. A driving cylinder is provided on the welding strip base, and the cylinder arm of the driving cylinder is connected to the lower end of the bidirectional rack. The driving cylinder is electrically connected to the pressure sensor.

7. The photovoltaic busbar-less battery string welding device according to claim 6, characterized in that: The bottom of the welding strip base is provided with a sliding groove, and the bidirectional rack is slidingly connected in the sliding groove.

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