A low-stress interconnection welding and welding strip self-adaptive correction device for photovoltaic cells

Abstract

The application provides a photovoltaic cell low-stress interconnection welding and welding strip self-adaptive correction device, and relates to the technical field of welding strip welding. The photovoltaic cell low-stress interconnection welding and welding strip self-adaptive correction device comprises a welding shell, and a track groove is arranged on the side of the welding shell; the device further comprises a feeding conveying mechanism arranged on the inner side of the welding shell and used for conveying photovoltaic cells; and a welding table fixedly installed on the inner side of the welding shell, and welding work is completed on the surface of the welding table. The photovoltaic cell low-stress interconnection welding and welding strip self-adaptive correction device realizes self-adaptive adjustment of the welding strip conveying width and conveying angle through a welding strip input mechanism, realizes integrated work of welding strip feeding, correction and fixed-length cutting through a cutting assembly integrated in the guide shell, effectively eliminates the problems of welding strip conveying deviation and distortion, greatly improves the alignment accuracy of the welding strip and the cell main grid, and reduces the defective rate of welding, such as virtual welding and deviation.

Description

Technical Field

[0001] This invention relates to the field of welding strip technology, specifically to a low-stress interconnect welding and adaptive correction device for photovoltaic cells. Background Technology

[0002] With the large-scale and efficient development of the photovoltaic industry, the production capacity of photovoltaic modules continues to increase. As a core process in module production, cell interconnection welding is widely carried out in the industry using automated string welding machines to complete the welding interconnection of the solder strip and the cell busbar. Photovoltaic solder strip, also known as tin-plated copper strip or tin-coated copper strip, is the core welding material for connecting photovoltaic module cells, mainly used for current transmission and collection.

[0003] However, existing traditional stringing equipment has revealed several inherent limitations in long-term mass production applications: First, the welding strip relies solely on a fixed guide channel for positioning, lacking adaptive correction and pre-bending buffer structures. This makes the welding strip prone to deviation and twisting during transport, resulting in poor alignment accuracy between the welding strip and the cell's main grid, leading to high rates of welding misalignment, incomplete welding, and missed welding. Second, the lack of a pressure-relieving pre-shaping process before welding means that the welding strip is directly fused at high temperature after being flat against the cell surface. The difference in thermal expansion coefficients between the welding strip and the silicon wafer generates significant welding internal stress, making thin and large-sized cells highly susceptible to microcracks and fragmentation, drastically reducing the yield of the cell string. Third, the cell positioning uses a single-sided pressure holding structure, which makes the cells prone to slippage during transport and welding, making it difficult to ensure positional consistency when multiple cells are simultaneously stringed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-stress interconnect welding and adaptive correction device for photovoltaic cells, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment, including a welding shell, a track groove provided on the side of the welding shell, and further including: a feeding conveying mechanism, the feeding conveying mechanism being disposed inside the welding shell for conveying photovoltaic cells; A welding table, which is fixedly installed inside the welding housing, and the welding operation is completed on the surface of the welding table; The welding mechanism is located inside the welding shell. The welding mechanism includes a linkage frame and welding components. The welding components are divided into two sets that are slidably disposed at both ends of the linkage frame and at the upper and lower ends of the welding table, respectively. A pressure-relieving device, which is aligned with the axis of the linkage frame, is used to change the bending angle of the welding strip. Power assembly, which is used to drive the pressure relief device and the linkage frame to rotate; A positioning mechanism is provided above the output end of the welding station to fix the position of the photovoltaic cells. A welding strip input mechanism is used to correct the direction of the welding strip and cut the welding strip.

[0006] Preferably, the linkage frame is a square frame, with two sets of sliding grooves at each end. Rotary bearings and bearing seats are fixedly installed at both ends of the linkage frame. The center of the rotary bearing is a hole, and a push tooth is provided on the outer side of the rotary bearing near the power component.

[0007] Preferably, the welding assembly includes a base shaft, a welding block, an elevation shaft, and an elevation component. The base shaft passes through the linkage frame and slides in contact with the inner wall of the chute. Guide blocks are provided at both ends of the base shaft, and the guide blocks slide in contact with the inner wall of the track groove. A positioning bracket is fixedly connected to the surface of the base shaft. The welding block is rotatably mounted on the surface of the base shaft and is used to weld the welding strip to the battery cell. The upper end of the welding block is rotatably connected to the elevation shaft. An elevation component is provided at both ends of the elevation shaft. The lower end of the elevation component is fixedly mounted on the surface of the positioning bracket. The center of the elevation component is a telescopic rod. Connecting seats are rotatably connected at both ends of the telescopic rod. The upper connecting seat is connected to the elevation shaft, and the lower connecting seat is connected to the positioning bracket.

[0008] Preferably, the pressure relief device has rotating rods at both ends, which pass through the center of the rotating bearing of the linkage frame. A first correction shaft and a second correction shaft are arranged between the two sets of rotating rods. The first correction shaft is located above the welding table, and small correction wheels are arranged in an array on its surface. The second correction shaft is located below the welding table, and large correction wheels are arranged in an array on its surface. The large correction wheels pass through the welding table and contact the battery cells. Correction grooves are provided on the surfaces of both the small and large correction wheels. A pressure relief tooth is provided at the end of the pressure relief device near the power component.

[0009] Preferably, the positioning mechanism includes a positioning belt, a pressing shaft, and a pressing plate. The two ends of the pressing shaft are fixedly disposed inside the welded housing. The middle section of the pressing plate is rotatably disposed on the surface of the pressing shaft. One end of the pressing plate is provided with a downward bend, and the other end is provided with a pressing angle. An electromagnetic block is provided on the upper surface of the pressing plate. The positioning belt is fixedly disposed inside the welded housing. An electromagnetic block corresponding to the electromagnetic block of the pressing plate is provided on the lower surface of the positioning belt. A traction rope is provided between the upper and lower sets of electromagnetic blocks, and a spring is sleeved on the outside of the traction rope.

[0010] Preferably, the welding strip input mechanism includes an input component, a guide shell, a cutting component, and a surrounding outer shell. The input component consists of a push shaft and a clamping shaft. The clamping shaft is connected to screws at both ends via connecting keys. The relative distance between the clamping shaft and the push shaft can be adjusted by the outer shells at both ends. The guide shell has round tubes at both ends and a shell in the middle. The round tube at the input end of the guide shell is close to the input component. The cutting component consists of a telescopic rod and a gate. The gate is slidably disposed inside the shell of the guide shell. The telescopic rod is fixedly connected to the back side of the gate. The fixed end of the telescopic rod is fixedly connected to the outer shell. The welding strip input mechanism is rotatably disposed inside the welding shell and the angle can be adjusted by rotating the handle.

[0011] Preferably, the power assembly is a power source disposed on the surface of the welded housing. The power assembly is provided with a first output gear and a second output gear. The first output gear meshes with a push gear, and the second output gear meshes with a pressure gear.

[0012] Preferably, the welding table is an integral flat plate, with a long strip-shaped through hole running vertically through one side of the welding table. The position of the through hole corresponds to the position of the guide shell and the welding block, and a groove is provided on the upper surface of the welding table.

[0013] Preferably, the feeding conveyor mechanism includes an input conveyor belt, a welding conveyor belt, and an output conveyor belt. The input conveyor belt and the output conveyor belt are respectively disposed at the input and output ends of the welding housing, and the welding conveyor belt is disposed inside the groove of the welding table.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This photovoltaic cell low-stress interconnect welding and welding strip adaptive correction equipment realizes adaptive adjustment of welding strip conveying width and conveying angle through welding strip input mechanism. Combined with the cutting component integrated inside the guide shell, it realizes integrated operation of welding strip feeding, correction and fixed length cutting, effectively eliminating welding strip conveying deviation and twisting problems, greatly improving the alignment accuracy of welding strip and cell main grid, and reducing welding defect rate such as false welding and deviation.

[0015] 2. This photovoltaic cell low-stress interconnect welding and solder strip adaptive correction equipment uses a coaxially arranged pressure relief device and upper and lower arranged first and second correction shafts in conjunction with correction grooves to complete the pre-bending and pre-tightening shaping of the solder strip. Before welding, the internal stress generated by the solder strip bonding is released in advance, reducing the stress impact caused by the difference in thermal expansion and contraction between the silicon wafer and the solder strip during high-temperature welding. This effectively suppresses microcracks and fragmentation defects in thin, large-size cells and improves the yield of finished cell strings.

[0016] 3. This photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment uses a single set of power components to synchronously drive the linkage frame and pressure relief device to rotate, achieving unified matching of weld strip shaping and welding stroke action timing. At the same time, the elevation component equipped with the welding assembly can dynamically adjust the downward tilt angle of the welding block, and together with the electromagnetic positioning mechanism, it stably clamps the cells in both directions, preventing the cells from slipping during the welding process. The entire set of equipment has a high degree of structural integration, is easy to debug, and can be adapted to the low-stress string welding production of various specifications of weld strips and thin-film cells of different sizes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the overall internal structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the welding conveyor belt structure of the present invention; Figure 5 This is a schematic diagram of the welding station structure of the present invention; Figure 6 This is a schematic diagram of the welding block structure of the present invention; Figure 7 This is a schematic diagram of the first correction shaft structure of the present invention; Figure 8 This is a schematic diagram of the tablet compression plate structure of the present invention; Figure 9 This is a schematic diagram of the input component structure of the present invention; Figure 10 This is a schematic diagram of the truncated component structure of the present invention; Figure 11 This is a schematic diagram of the linkage frame structure of the present invention.

[0018] In the diagram: 1. Welding shell; 11. Track groove; 2. Feeding conveyor mechanism; 21. Input conveyor belt; 22. Welding conveyor belt; 23. Output conveyor belt; 3. Welding table; 4. Welding mechanism; 41. Linkage frame; 411. Slide groove; 412. Pushing gear; 42. Welding assembly; 421. Base shaft; 4211. Guide block; 4212. Positioning bracket; 422. Welding block; 423. Elevation shaft; 424. Elevation assembly; 5. Pressure relief device; 51. First correction shaft; 52. Second correction shaft; 53. Rotating pressure gear; 6. Power assembly; 61. First output gear; 62. Second output gear; 7. Positioning mechanism; 71. Positioning belt; 72. Pressure plate shaft; 73. Pressure plate; 8. Welding strip input mechanism; 81. Input assembly; 811. Pushing shaft; 812. Clamping shaft; 82. Guide shell; 83. Cutting assembly. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0023] like Figure 1-11 As shown, a photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment includes a welding housing 1, a track groove 11 provided on the side of the welding housing 1, and also includes: a feeding conveying mechanism 2, a welding table 3, a welding mechanism 4, a pressure relief device 5, a power component 6, a positioning mechanism 7, and a weld strip input mechanism 8. The feeding conveyor 2 is located inside the welding housing 1 and is used to convey photovoltaic cells. The welding table 3 is fixedly installed inside the welding housing 1 and the welding operation is completed on the surface of the welding table 3. The welding mechanism 4 is located inside the welding housing 1 and includes a linkage frame 41 and welding components 42. There are two sets of welding components 42 that are slidably installed at both ends of the linkage frame 41. The two sets of welding components 42 are respectively installed at the upper and lower ends of the welding table 3. The pressure relief device 5 is axially aligned with the linkage frame 41 and is used to change the bending angle of the welding strip. The power component 6 is used to drive the pressure relief device 5 and the linkage frame 41 to rotate. The positioning mechanism 7 is located above the output end of the welding table 3 and is used to fix the position of the photovoltaic cells. The welding strip input mechanism 8 is used to correct the direction of the welding strip and cut the welding strip.

[0024] In this embodiment, the feeding conveyor mechanism 2 is arranged in segments. The input conveyor belt 21 is responsible for continuously conveying the single battery cell to be welded into the welding housing 1. The welding conveyor belt 22 is embedded in the groove on the surface of the welding station 3 and can carry the battery cell to complete the entire process of positioning, shaping and welding simultaneously with the process. The output conveyor belt 23 smoothly delivers the welded battery string out of the welding station. The three conveyor belts are driven independently and their speeds are matched to ensure that the battery cell conveying spacing is uniform and there will be no stacking or jamming problems. A through track groove 11 is opened on the side of the welding housing 1 to provide guidance and constraint for the lateral sliding of the welding component 42. At the same time, it plays a role in dust prevention and protection of the internal welding station, and can isolate the fumes generated by the high temperature of welding, thus improving the equipment operating environment.

[0025] In an optional embodiment, the linkage frame 41 is rectangular in shape, and two sets of sliding grooves 411 are respectively provided at both ends of the linkage frame 41. Rotary bearings and bearing seats are fixedly provided at both ends of the linkage frame 41. The center of the rotary bearing is a hole, and a push tooth 412 is provided on the outer side of the rotary bearing near the power component 6.

[0026] In this embodiment, the linkage frame 41 with its square frame structure has high overall rigidity and is not easily deformed under stress. The sliding grooves 411 at both ends provide sliding installation space for the base shaft 421, ensuring that the two sets of welded components 42 move synchronously. High-precision rotating bearings and bearing seats are installed at both ends to reduce the frictional resistance during the overall rotation of the linkage frame 41. A through hole is reserved in the center of the bearing for the rotating rod of the pressure relief device 5 to pass through, so that the linkage frame 41 and the pressure relief device 5 can rotate independently on the same axis without interfering with each other. The push gear 412 is integrally formed on the outside of the bearing and precisely meshes with the first output gear 61 of the power component 6. The rotational power is stably transmitted by the gear meshing transmission, ensuring that the rotation angle of the linkage frame 41 is controllable and the transmission is slip-free.

[0027] In an optional embodiment, the welding assembly 42 includes a base shaft 421, a welding block 422, an elevation shaft 423, and an elevation component 424. The base shaft 421 passes through the linkage frame 41 and slides in contact with the inner wall of the slide groove 411. Guide blocks 4211 are provided at both ends of the base shaft 421, and the guide blocks 4211 slide in contact with the inner wall of the track groove 11. A positioning bracket 4212 is fixedly connected to the surface of the base shaft 421. The welding block 422 is rotatably disposed on the surface of the base shaft 421 and is used to weld the welding strip to the battery cell. The upper end of the welding block 422 is rotatably connected to the elevation shaft 423. An elevation component 424 is provided at both ends of the elevation shaft 423. The lower end of the elevation component 424 is fixedly disposed on the surface of the positioning bracket 4212. The center of the elevation component 424 is a telescopic rod. Connecting seats are rotatably connected at both ends of the telescopic rod. The upper connecting seat is connected to the elevation shaft 423, and the lower connecting seat is connected to the positioning bracket 4212.

[0028] In this embodiment, the base shaft 421 is guided by both the slide groove 411 and the track groove 11. The guide blocks 4211 at both ends are engaged inside the track groove 11, restricting the base shaft 421 to slide only laterally along the track groove 11, thus preventing the welding assembly 42 from shifting. The positioning bracket 4212 is rigidly connected to the base shaft 421, providing a stable mounting base for the elevation assembly 424. The elevation assembly 424 adopts a telescopic structure with hinged ends. When the telescopic rod extends or retracts, it can pull the elevation shaft 423 to rotate, thereby driving the welding block 422 to adjust the downward welding tilt angle around the base shaft 421. This allows the welding angle to be adapted to the actual posture of the welding strip after pre-bending, ensuring that the welding block 422 is fully in contact with the welding strip and the battery cell welding point, resulting in uniform welding pressure distribution and reducing local stress concentration.

[0029] In an optional embodiment, the pressure relief device 5 has rotating rods at both ends, which pass through the center of the rotating bearing of the linkage frame 41. A first correction shaft 51 and a second correction shaft 52 are arranged between the two sets of rotating rods. The first correction shaft 51 is located above the welding table 3, and small correction wheels are arranged in an array on the surface of the first correction shaft 51. The second correction shaft 52 is located below the welding table 3, and large correction wheels are arranged in an array on the surface of the second correction shaft 52. The large correction wheels pass through the welding table 3 and contact the battery cell. Correction grooves are provided on the surfaces of both the small correction wheels and the large correction wheels. A pressure tooth 53 is provided at the end of the pressure relief device 5 near the power component 6.

[0030] In this embodiment, the first straightening shaft 51 and the second straightening shaft 52, arranged in upper and lower layers, form a clamping and shaping structure. The rotating rod passes coaxially through the bearing hole of the linkage frame 41 and can rotate independently without interfering with the movement of the linkage frame 41. The small straightening wheel and the large straightening wheel have straightening grooves on their surfaces that match the shape of the welding strip, which can engage and limit the welding strip and prevent the welding strip from sliding laterally during the shaping process. The upper small straightening wheel presses the welding strip on the top surface of the battery cell, and the lower large straightening wheel passes through the through hole of the welding table 3 to lift the welding strip at the bottom of the battery cell. The welding strip is pre-bent by bidirectional synchronous extrusion, which releases the internal stress of the welding strip in the straight state in advance. The pressure tooth 53 meshes with the second output gear 62 and is driven by the power component 6 to rotate the pressure relief device 5, which precisely controls the bending angle and timing of the welding strip to adapt to the shaping needs of welding strips with different thicknesses and widths.

[0031] In an optional embodiment, the positioning mechanism 7 includes a positioning belt 71, a pressing shaft 72, and a pressing plate 73. The two ends of the pressing shaft 72 are fixedly disposed inside the welded housing 1. The middle section of the pressing plate 73 is rotatably disposed on the surface of the pressing shaft 72. One end of the pressing plate 73 is provided with a downward bend, and the other end is provided with a pressing angle. An electromagnetic block is provided on the upper surface of the pressing plate 73. The positioning belt 71 is fixedly disposed inside the welded housing 1. An electromagnetic block corresponding to the electromagnetic block of the pressing plate 73 is provided on the lower surface of the positioning belt 71. A traction rope is provided between the upper and lower sets of electromagnetic blocks, and a spring is sleeved on the outside of the traction rope.

[0032] In this embodiment, the pressing plate 73 can rotate and swing around the pressing shaft 72. When energized, the upper and lower electromagnetic blocks attract each other, pulling the traction rope to compress the spring, causing the angled end of the pressing plate 73 to release the battery cell on the surface of the welding platform 3. The bent end limits the side of the battery cell, thus limiting the battery cell. When de-energized, the spring extends, and neither end contacts the battery cell. When energized in the reverse direction, the repulsive force increases, and the angled end falls to clamp the battery cell, so that when the welding strip is lifted upward, it can press the battery cell to prevent it from moving. After the welding process is completed, the electromagnetic blocks are energized, pulling the pressing plate 73 to lift it up, releasing the clamping of the battery cell, and not interfering with the feeding conveyor 2. The electromagnetic adsorption positioning has a fast response speed, and the clamping force is gentle and controllable, which will not damage the thin battery cell. At the same time, it can be adapted to the positioning of battery cells of different sizes.

[0033] In an optional embodiment, the welding strip input mechanism 8 includes an input component 81, a guide shell 82, a cutting component 83, and a surrounding outer shell. The input component 81 consists of a push shaft 811 and a clamping shaft 812. The clamping shaft 812 is connected to the push shaft 811 by connecting keys and screws at both ends. The relative distance between the clamping shaft 812 and the push shaft 811 can be adjusted by the outer shell at both ends. The guide shell 82 has round tubes at both ends and a shell in the middle. The round tube at the input end of the guide shell 82 is close to the input component 81. The cutting component 83 consists of a telescopic rod and a gate. The gate is slidably disposed inside the shell of the guide shell 82. The telescopic rod is fixedly connected to the back side of the gate. The fixed end of the telescopic rod is fixedly connected to the outer shell. The welding strip input mechanism 8 is rotatably disposed inside the welding shell 1 and the angle can be adjusted by rotating the handle.

[0034] In this embodiment, the input component 81 relies on the rotation of the push shaft 811 to transport the welding strip. Loosening the screw can adjust the gap between the clamping shaft 812 and the push shaft 811, adapting to the clamping and transport of welding strips of different thicknesses. The round tubes at both ends of the guide shell 82 serve as guides for the introduction and export of welding strips. The middle section of the shell has a reserved sliding cavity for the gate knife, and the integrated cutting component 83 can cut off the welding strip immediately after it is transported to the correct position. The entire welding strip input mechanism 8 is rotatable. The tilt angle can be adjusted by an external rotating handle to match the transport path of the welding strips crossing the upper and lower parts of the battery cell, correcting the direction of welding strip transport from the source and reducing the twisting and deviation of the welding strips.

[0035] In an optional embodiment, the power assembly 6 is a power source disposed on the surface of the welded housing 1. The power assembly 6 is provided with a first output gear 61 and a second output gear 62. The first output gear 61 meshes with the push gear 412, and the second output gear 62 meshes with the rotating gear 53.

[0036] In this embodiment, the power component 6 uses a servo motor as the power source, and synchronously outputs two sets of gears to drive the linkage frame 41 and the pressure relief device 5 respectively. Only a single power source is needed to synchronously control the rotation of the welding strip shaping and welding mechanism 4, eliminating the need for multiple independent drive units and simplifying the overall control system. The gear meshing transmission ratio is stable, and the timing of the shaping and welding actions is highly synchronized, avoiding misalignment between the welding strip shaping and welding processes and improving welding consistency.

[0037] In an optional embodiment, the welding table 3 is an integral flat plate, and a long strip-shaped through hole is provided on one side of the welding table 3, the position of which corresponds to the position of the guide shell 82 and the welding block 422. A groove is provided on the upper surface of the welding table 3.

[0038] In this embodiment, the welding table 3 is made of high-temperature resistant insulating flat plate material, and the surface groove is used to accommodate the welding conveyor belt 22, so that the battery cells can move synchronously with the conveyor belt; the long strip through hole runs through the top and bottom of the table, allowing the welding strip to pass downwards, while providing clearance for the large straightening wheel of the second straightening shaft 52 below, ensuring that the upper and lower straightening wheels can contact the welding strip at the same time to complete the shaping. The position of the through hole is precisely aligned with the welding strip conveying and welding station, without interference or obstruction.

[0039] In an optional embodiment, the feeding conveyor 2 includes an input conveyor belt 21, a welding conveyor belt 22, and an output conveyor belt 23. The input conveyor belt 21 and the output conveyor belt 23 are respectively disposed at the input and output ends of the welding housing 1, and the welding conveyor belt 22 is disposed inside the groove of the welding table 3.

[0040] In this embodiment, the three conveyor belts are divided into sections with different functions. The input conveyor belt 21 completes the feeding and buffering of the battery cells, the welding conveyor belt 22 carries the battery cells to complete all the core processes of positioning, welding strip shaping and welding, and the output conveyor belt 23 smoothly delivers the formed battery string. The speed of the three conveyor belts is controlled in a coordinated manner, and the conveying stroke is equal to the width of a single battery cell, so as to realize continuous and uninterrupted string welding operation and smooth conveying without jamming.

[0041] Before using the equipment, pre-adjustment should be completed: rotate the welding strip input mechanism 8 by rotating the handle, adjust its tilt angle according to the size of the cell to be processed and the specifications of the welding strip, and match the conveying path of the welding strip connecting two cells; then place the photovoltaic cells evenly on the input conveyor belt 21 of the feeding conveyor mechanism 2. After the equipment is started, the input conveyor belt 21 will continuously convey the cells to the inside of the welding housing 1 until the first cell is transferred to the second half of the welding station 3. At this time, the two sets of cells to be interconnected are arranged synchronously on the welding station 3. The coiled welding strip is inserted into the guide shell 82 of the welding strip input mechanism 8, so that the end of the welding strip is placed between the push shaft 811 and the clamping shaft 812. The locking screws on both sides of the shell are loosened, and the gap between the clamping shaft 812 and the push shaft 811 is finely adjusted to match the current welding strip thickness before being locked again. The welding strip is stably clamped and transported by the cooperation of the two shafts. The motor drives the push shaft 811 to rotate and feeds out the welding strip at a uniform speed. The welding strip extends obliquely along the channel of the guide shell 82, passes through the long strip through hole of the welding table 3, and overlaps at the gap of the main grid of the front and rear battery cells. The power component 6 outputs power synchronously, and its second output gear 62 meshes to drive the pressure gear 53 to rotate, which in turn drives the pressure relief device 5 to rotate coaxially. The upper first correction shaft 51 presses down and tightens the welding strip on the upper surface of the front battery cell with the help of the small correction wheels of the surface array. The lower second correction shaft 52 rotates synchronously, and its large correction wheel passes through the through hole of the welding table 3 to lift the bottom welding strip. At the same time, the pressure plate 73 is pushed down by the spring and the electromagnetic repulsion force to control the position of the rear battery cell, preventing the rear battery cell from being displaced by the lifting force. The correction grooves on the surfaces of the two wheels limit the welding strip in both directions and pre-bend and shape it, correct the welding strip offset in advance, release the internal stress of the welding strip, and ensure that the welding strip and the main grid of the battery cell are accurately aligned. After the shaping is in place, the telescopic rod of the cutting component 83 extends forward and pushes the gate to slide along the inner cavity of the guide shell 82 to cut the fixed length of welding strip in one go. After the welding strip is shaped and cut, the first output gear 61 of the power component 6 meshes with the drive gear 412 to rotate, which drives the square frame linkage frame 41 to rotate as a whole. The linkage frame 41 drives the two sets of welding components 42 to slide laterally along the side track groove 11 of the welding shell 1 through the slide groove 411. At the same time, the pressure relief device 5 is reset and placed to affect the welding process. The welding block 422 is heated simultaneously. The telescopic rod inside the elevation component 424 extends and pulls the elevation shaft 423 to rotate, which drives the welding block 422 to adaptively adjust the downward tilt angle around the base shaft 421, so that the welding block 422 completely fits the welding strip and the surface of the battery cell welding point, and uniformly applies pressure to complete the high-temperature fusion and interconnection of the welding strip and the battery cell. After all the welding processes of a single set of solar cells are completed, the positioning mechanism 7 disconnects the voltage plate 73 from the solar cell, and the feeding conveyor 2 advances synchronously by a stroke the width of one solar cell. The welding conveyor belt 22 transports the welded solar cell string forward, and new solar cells to be welded are added to the front station of the welding table 3 by the input conveyor belt 21. The above-mentioned welding strip conveying, shaping, cutting, positioning and welding processes are repeated to realize continuous automated production of photovoltaic solar cell interconnect welding.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic cell low-stress interconnect welding and weld strip adaptive correction device, comprising a welding housing (1), wherein a track groove (11) is provided on the side of the welding housing (1), characterized in that, Also includes: Feeding conveyor (2), which is located inside the welding housing (1) and is used to convey photovoltaic cells; Welding table (3), which is fixedly installed inside the welding shell (1), and the welding operation is completed on the surface of the welding table (3); Welding mechanism (4) is located inside the welding shell (1). The welding mechanism (4) includes a linkage frame (41) and welding components (42). The welding components (42) are arranged in two sets at both ends of the linkage frame (41) and the two sets of welding components (42) are respectively located at the upper and lower ends of the welding table (3). Pressure relief device (5), the pressure relief device (5) is the same as the axis of the linkage frame (41), and the pressure relief device (5) is used to change the bending angle of the welding strip; Power assembly (6), which is used to drive the pressure relief device (5) and the linkage frame (41) to rotate; Positioning mechanism (7), which is set above the output end of welding table (3) and is used to fix the position of photovoltaic cell; The welding strip input mechanism (8) is used to correct the direction of the welding strip and cut the welding strip.

2. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 1, characterized in that: The linkage frame (41) is a square frame. Two sets of sliding grooves (411) are provided at both ends of the linkage frame (41). Rotary bearings and bearing seats are fixedly provided at both ends of the linkage frame (41). The center of the rotary bearing is a hole. Push teeth (412) are provided on the outer side of the rotary bearing near the power component (6).

3. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 2, characterized in that: The welding assembly (42) includes a base shaft (421), a welding block (422), an elevation shaft (423), and an elevation component (424). The base shaft (421) passes through the linkage frame (41) and slides in contact with the inner wall of the slide groove (411). Guide blocks (4211) are provided at both ends of the base shaft (421). The guide blocks (4211) slide in contact with the inner wall of the track groove (11). A positioning bracket (4212) is fixedly connected to the surface of the base shaft (421). The welding block (422) is rotatably mounted on the base shaft. (421) Surface, welding block (422) is used to weld the welding strip to the battery cell. The upper end of welding block (422) is rotatably connected to the elevation shaft (423). Both ends of the elevation shaft (423) are provided with elevation components (424). The lower end of the elevation component (424) is fixedly set on the surface of the positioning bracket (4212). The center of the elevation component (424) is a telescopic rod. Both ends of the telescopic rod are rotatably connected with connecting seats. The upper connecting seat is connected to the elevation shaft (423), and the lower connecting seat is connected to the positioning bracket (4212).

4. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 3, characterized in that: The pressure relief device (5) has rotating rods at both ends. The rotating rods pass through the center of the rotating bearing of the linkage frame (41). A first correction shaft (51) and a second correction shaft (52) are arranged between the two sets of rotating rods. The first correction shaft (51) is arranged above the welding table (3). Small correction wheels are arranged in an array on the surface of the first correction shaft (51). The second correction shaft (52) is arranged below the welding table (3). Large correction wheels are arranged in an array on the surface of the second correction shaft (52). The large correction wheels pass through the welding table (3) and contact the battery cell. Correction grooves are arranged on the surfaces of both the small correction wheels and the large correction wheels. A pressure tooth (53) is arranged at the end of the pressure relief device (5) near the power component (6).

5. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 1, characterized in that: The positioning mechanism (7) includes a positioning belt (71), a pressing shaft (72), and a pressing plate (73). The two ends of the pressing shaft (72) are fixedly set inside the welded housing (1). The middle section of the pressing plate (73) is rotatably set on the surface of the pressing shaft (72). One end of the pressing plate (73) is provided with a downward bend, and the other end is provided with a pressing angle. An electromagnetic block is provided on the upper surface of the pressing plate (73). The positioning belt (71) is fixedly set inside the welded housing (1). An electromagnetic block corresponding to the electromagnetic block of the pressing plate (73) is provided on the lower surface of the positioning belt (71). A traction rope is provided between the upper and lower sets of electromagnetic blocks, and a spring is sleeved on the outside of the traction rope.

6. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 3, characterized in that: The welding strip input mechanism (8) includes an input component (81), a guide shell (82), a cutting component (83), and a surrounding outer shell. The input component (81) consists of a push shaft (811) and a clamping shaft (812). The clamping shaft (812) is connected to the push shaft (811) by connecting keys and screws at both ends. The relative distance between the outer shell at both ends and the push shaft (811) can be adjusted. The guide shell (82) has round tubes at both ends and a shell in the middle. The round tube at the input end of the guide shell (82) is close to the input component (81). The cutting component (83) consists of a telescopic rod and a gate. The gate is slidably disposed inside the shell of the guide shell (82). The telescopic rod is fixedly connected to the back side of the gate. The fixed end of the telescopic rod is fixedly connected to the outer shell. The welding strip input mechanism (8) is rotatably disposed inside the welding shell (1). The angle can be adjusted by rotating the handle.

7. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 4, characterized in that: The power assembly (6) is a power source set on the surface of the welded shell (1). The power assembly (6) is provided with a first output gear (61) and a second output gear (62). The first output gear (61) meshes with the push gear (412), and the second output gear (62) meshes with the rotating gear (53).

8. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 6, characterized in that: The welding table (3) is an integral flat plate. A long strip-shaped through hole is provided on one side of the welding table (3), and the position of the through hole corresponds to the position of the guide shell (82) and the welding block (422). A groove is provided on the upper surface of the welding table (3).

9. The photovoltaic cell low-stress interconnect welding and weld strip adaptive correction equipment according to claim 8, characterized in that: The feeding conveyor (2) includes an input conveyor belt (21), a welding conveyor belt (22) and an output conveyor belt (23). The input conveyor belt (21) and the output conveyor belt (23) are respectively located at the input and output ends of the welding shell (1), and the welding conveyor belt (22) is located inside the groove of the welding table (3).

Images