Edge sealing and repair curing apparatus for solar cell silicon wafers

Abstract

This utility model relates to an edge-sealing and curing device for solar cell silicon wafers, belonging to the photovoltaic manufacturing field. The technical solution includes a conveying mechanism comprising a first conveying roller arranged along a first direction; and an edge-sealing mechanism comprising a second conveying roller arranged along the first direction and adjacent to the first conveying roller, and edge-sealing wheels disposed on both sides of the second conveying roller. Edge-sealing blocks are disposed in areas of the edge-sealing wheels that do not contact the solar cell silicon wafer. Each edge-sealing block has a feeding groove for supplying insulating material. When the edge-sealing wheels are rotating, the feeding groove can evenly coat the insulating material onto the outer surface of the edge-sealing wheels. After the solar cell silicon wafer to be edge-sealed is conveyed from the first conveying roller area to the second conveying roller area, the insulating material on the outer surface of the edge-sealing wheels contacts the side edge of the solar cell silicon wafer to be edge-sealed. This improves the yield of the solar cell silicon wafer and reduces the risk of breakage.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic manufacturing technology, and in particular to an edge sealing and curing device for silicon wafers used in solar cells. Background Technology

[0002] Silicon wafers for solar cells are doped with different elements to form N-type and P-type doping, creating a PN junction. Under illumination, this generates a voltage difference and simultaneously produces charge carriers, enabling the cell to supply power. To improve the reliability of silicon wafers, their edges are insulated. During the electroplating process to form metal electrodes, the edges of the silicon wafer need to be protected with insulating materials to prevent metal deposition around the wafer from causing a short circuit.

[0003] Furthermore, the uneven structure on the sides of solar cell silicon wafers is a result of both process and functional requirements: wet etching, due to the anisotropy of silicon crystals, uses solutions such as NaOH and HF to form pyramidal or trench-like structures on the edges of the silicon wafer; dry etching generates nanoscale rough textures through plasma ion bombardment. Functionally, this structure can disrupt surface continuity, reducing carrier recombination at the edges; its uneven shape can increase the light scattering path, extend the light propagation distance within the silicon wafer, and improve light absorption efficiency. However, it is worth noting that defects and microcracks often exist on the sides of solar cell silicon wafers. These are mainly caused by mechanical stress during cutting, edge damage due to tool wear or improper parameters, the influence of crystal defects or impurities in the silicon wafer material itself, stress caused by uneven chemical corrosion or sudden temperature changes during subsequent cleaning and etching processes, and mechanical collisions or stress concentrations during handling and installation. These defects and microcracks can significantly affect the performance and yield of solar cells.

[0004] In the prior art, a dispensing machine is usually used to apply adhesive to the sides of solar cell silicon wafers for edge sealing. There is also an automatic edge sealing device and method for photovoltaic cells disclosed in CN116417532A, in which a wafer carrier platform carries the cell to be sealed in a linear translational motion. When the side of the cell is engaged with the coating roller, the coating roller applies the coating material released during its rotation to the side, thereby achieving edge sealing of the side.

[0005] However, on the one hand, because the sides of solar cell silicon wafers have an uneven structure, the existing technologies that use non-contact coating methods to seal the edges can only coat the insulating material onto the side surface of the solar cell silicon wafer. The contact area between the insulating material and the side of the solar cell silicon wafer is small, which can easily lead to the peeling off of the insulating material and short circuits in the solar cell silicon wafer caused by leakage during subsequent electroplating, resulting in poor sealing effect. On the other hand, the existing solar cell silicon wafer sealing technology is even less able to repair side defects or microcracks in solar cell silicon wafers when the sealing effect is not ideal. Summary of the Invention

[0006] The purpose of this invention is to provide an edge sealing and curing device for silicon wafers used in solar cells, in order to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An edge-sealing repair and curing device for solar cell silicon wafers, the edge-sealing repair and curing device comprising:

[0009] The conveying mechanism includes a first conveying roller disposed along a first direction; and

[0010] An edge sealing mechanism includes a second conveying roller arranged along a first direction and adjacent to the first conveying roller, and edge sealing wheels arranged on both sides of the second conveying roller. An edge sealing block is provided in other areas of the edge sealing wheel that do not contact the solar cell silicon wafer. The edge sealing block has a feeding groove for supplying insulating material. When the edge sealing wheel is rotating, the feeding groove can uniformly coat the insulating material on the outer surface of the edge sealing wheel.

[0011] In this process, after the solar cell silicon wafer to be sealed is transported from the first conveying roller area to the second conveying roller area, the insulating material on the outer side of the sealing roller comes into contact with the side of the solar cell silicon wafer to be sealed.

[0012] In one possible implementation, the conveying mechanism further includes: limiting rollers disposed on both sides of the first conveying roller to ensure consistency when the first conveying roller is conveyed to the second conveying roller.

[0013] In one possible implementation, if the inner distance between the limiting rollers on both sides of the first conveying roller is set to a and the inner distance between the sealing rollers on both sides of the second conveying roller is set to b, then a = b is satisfied.

[0014] In one possible implementation, the sealing mechanism further includes an upper pressure roller disposed above the second conveying roller, wherein the solar cell silicon wafer moves between the second conveying roller and the upper pressure roller.

[0015] In one possible implementation, the feeding groove has a return end and a discharge end corresponding to the rotation direction of the sealing wheel, and the groove width from the return end to the discharge end of the feeding groove gradually decreases.

[0016] In one possible implementation, a small material tank is installed in the material tank hole of the edge sealing block, and the material supply groove has a feed port connected to the small material tank. The small material tank corresponding to each edge sealing wheel is connected to a large material tank through a conduit for continuously introducing insulating material.

[0017] In one possible implementation, the edge sealing wheel and the edge sealing block are mounted on the edge sealing seat, the edge sealing wheel is rotatably mounted on the edge sealing seat via a shaft and bearings, and the edge sealing block is connected to the edge sealing seat by bolts.

[0018] In one possible implementation, the edge sealing repair and curing device further includes:

[0019] The curing mechanism includes a third conveying roller arranged along a first direction and adjacent to the second conveying roller, an ultraviolet lamp tube disposed above the third conveying roller, and a protective cover covering the outside of the ultraviolet lamp tube.

[0020] In one possible implementation, the edge sealing repair and curing device further includes:

[0021] The docking rotation mechanism includes a first docking conveyor belt arranged along a first direction and adjacent to the third conveying roller, a rotating bidirectional conveyor belt adjacent to the first docking conveyor belt, a rotary motor for driving the rotating bidirectional conveyor belt to rotate, and a second docking conveyor belt arranged along the first direction and adjacent to the rotating bidirectional conveyor belt.

[0022] The rotating bidirectional conveyor belt includes a first rotating conveyor belt arranged along a first direction and a second rotating conveyor belt arranged along a second direction and located inside the first rotating conveyor belt.

[0023] In one possible implementation, the thickness of the sealing wheel is greater than the thickness of the solar cell silicon wafer, and the solar cell silicon wafer and the sealing wheel are on the same horizontal plane; the insulating material includes at least UV adhesive; and the sealing wheel includes at least a silicone sealing wheel.

[0024] The beneficial effects of the technical solution provided by this utility model include at least the following:

[0025] This technical solution includes a conveying mechanism comprising a first conveying roller arranged along a first direction; and an edge sealing mechanism comprising a second conveying roller arranged along the first direction and adjacent to the first conveying roller, and edge sealing wheels arranged on both sides of the second conveying roller. Edge sealing blocks are provided in other areas where the edge sealing wheels do not contact the solar cell silicon wafer. Each edge sealing block has a feeding groove for supplying insulating material. When the edge sealing wheel is rotating, the feeding groove can evenly coat the insulating material onto the outer surface of the edge sealing wheel. After the solar cell silicon wafer to be edge-sealed is conveyed from the first conveying roller area to the second conveying roller area, the insulating material on the outer surface of the edge sealing wheel contacts the side edge of the solar cell silicon wafer to be edge-sealed. In this context, on the one hand, by using contact sealing, the uneven structure on the side of the solar cell silicon wafer is filled and sealed with insulating material, greatly increasing the contact area between the insulating material and the side of the solar cell silicon wafer. This avoids short circuits in the solar cell silicon wafer caused by the peeling of the insulating material and leakage during subsequent electroplating, resulting in a good sealing effect. On the other hand, it enables the repair of defects or microcracks on the side of the solar cell silicon wafer, improving the performance and yield of the solar cell silicon wafer and effectively reducing the risk of breakage. Attached Figure Description

[0026] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0027] Figure 1 This diagram illustrates the overall structure of a solar cell silicon wafer edge sealing and curing device provided in an exemplary embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the conveying mechanism of a solar cell silicon wafer edge sealing and curing device provided in an exemplary embodiment of the present invention is shown.

[0029] Figure 3 This illustration shows a schematic diagram of the edge-sealing mechanism of an edge-sealing repair and curing device for solar cell silicon wafers provided in an exemplary embodiment of the present invention.

[0030] Figure 4 This illustration shows a schematic diagram of the assembly structure of a single sealing wheel in the sealing mechanism of a solar cell silicon wafer sealing and repair curing device provided in an exemplary embodiment of the present invention.

[0031] Figure 5 This illustration shows a schematic diagram of the edge sealing block of the edge sealing mechanism in an exemplary embodiment of the solar cell silicon wafer edge sealing repair and curing device provided by the present invention.

[0032] Figure 6This illustration shows a schematic diagram of the rotating bidirectional conveyor belt of the docking rotating mechanism of the edge-sealing repair and curing device for solar cell silicon wafers provided in an exemplary embodiment of the present invention.

[0033] Figure 7 A schematic diagram of the structure of the side portion of a solar cell silicon wafer provided in an exemplary embodiment of the present invention is shown.

[0034] Figure 8 This diagram illustrates the effect of applying prior art non-contact coating to the side portion of a solar cell silicon wafer according to an exemplary embodiment of the present invention.

[0035] Figure 9 This diagram illustrates the effect of contact coating on the side of a solar cell silicon wafer provided by an exemplary embodiment of the present invention.

[0036] In the picture:

[0037] 1. Solar cell silicon wafers; 2. Edge sealing, repair, and curing equipment;

[0038] 11. Side section; 21. Conveying mechanism; 22. Sealing mechanism; 23. Curing mechanism; 24. Docking and rotating mechanism; 25. Large material tank;

[0039] 211. First conveyor roller; 212. Limiting roller; 221. Edge sealing roller; 222. Second conveyor roller; 223. Upper pressure roller; 224. Edge sealing block; 225. Small material tank; 226. Edge sealing seat; 231. Third conveyor roller; 232. Protective cover; 241. First docking conveyor belt; 242. Rotary bidirectional conveyor belt; 243. Rotary motor; 244. Second docking conveyor belt;

[0040] 2241, Feeding groove; 2242, Material tank opening; 2421, First rotary conveyor belt; 2422, Second rotary conveyor belt;

[0041] 22411, Inlet; 22412, Return end; 22413, Outlet. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] See Figure 1 and Figure 2 The edge sealing and curing equipment 2 for solar cell silicon wafers includes: a conveying mechanism 21, which includes a first conveying roller 211 arranged along a first direction; and an edge sealing mechanism 22, see reference. Figures 3 to 5 It includes a second conveying roller 222 arranged along a first direction and adjacent to the first conveying roller 211, and sealing rollers 221 arranged on both sides of the second conveying roller 222. Sealing blocks 224 are arranged in other areas of the sealing rollers 221 that do not contact the solar cell silicon wafer 1. The sealing blocks 224 have a feeding groove 2241 for supplying insulating material. When the sealing rollers 221 are rotating, the feeding groove 2241 can evenly coat the insulating material on the outer side of the sealing rollers 221. After the solar cell silicon wafer 1 to be sealed is conveyed from the area of ​​the first conveying roller 211 to the area of ​​the second conveying roller 222, the insulating material on the outer side of the sealing rollers 221 contacts the side portion 11 of the solar cell silicon wafer 1 to be sealed.

[0046] In the embodiments of this application, see Figures 1 to 4 Within the working range of the sealing mechanism 22, a row of sealing wheels 221 is adapted to each of the two opposite sides 11 of the solar cell silicon wafer 1 in the first direction, with at least one sealing wheel 221 in each row, to simultaneously seal and repair the two opposite sides 11 of the solar cell silicon wafer 1 in the first direction. Preferably, the sealing wheels 221 on both sides seal the two sides of the solar cell silicon wafer 1 multiple times to ensure that the uneven structure of the side sides 11 of the solar cell silicon wafer 1 is filled and sealed with insulating material and that defects or microcracks on the side sides of the solar cell silicon wafer 1 are repaired.

[0047] In an optional embodiment, see [link to relevant documentation] Figures 1 to 4The solar cell silicon wafer 1 to be edge-sealed is conveyed to the edge-sealing mechanism 22 along a first direction by the first conveying roller 211 of the conveying mechanism 21. The conveying mechanism 21 includes at least one first conveying roller 211. Preferably, the conveying mechanism 21 includes multiple first conveying rollers 211.

[0048] In one alternative embodiment, there is no upper pressure roller above the first conveying roller 211 in the conveying mechanism 21. In some other embodiments, an upper pressure roller (not shown) is provided above some of the first conveying rollers 211 in the conveying mechanism 21. In some other embodiments, an upper pressure roller (not shown) is provided above all the first conveying rollers 211 in the conveying mechanism 21.

[0049] In an optional embodiment, see [link to relevant documentation] Figures 1 to 4 The solar cell silicon wafer 1 to be sealed is conveyed by the first conveying roller 211 of the conveying mechanism 21 along the first direction to the second conveying roller 222 of the sealing mechanism 22. During the conveying process of the solar cell silicon wafer 1 on the first conveying roller 211, the consistency of the conveying to the sealing mechanism 22 is ensured by multiple limiting rollers 212 set on both sides of the first conveying roller 211.

[0050] In this embodiment, precise silicon wafer transport is achieved through the collaborative structure of the conveying mechanism 21 and the edge sealing mechanism 22. The first conveying roller 211 of the conveying mechanism 21 transports the solar cell silicon wafer 1 to be edge sealed along the first direction. Multiple limiting rollers 212 on both sides of the conveying mechanism 21 form a lateral constraint boundary by limiting the inner spacing, so as to prevent the solar cell silicon wafer 1 from shifting laterally or tilting during the transport process, and ensure that it enters the edge sealing mechanism 22 with uniform positional accuracy.

[0051] In some embodiments, all the positioning rollers 212 are aligned with the sealing wheels 221 within the sealing mechanism 22. In other embodiments, the positioning rollers 212 have a flared shape, meaning that the positioning rollers 212 can gradually guide both sides of the solar cell silicon wafer 1 to align with the straight line of the sealing wheels 221.

[0052] Optionally, the edge sealing mechanism 22 includes at least one second conveying roller 222. Preferably, the edge sealing mechanism 22 includes multiple second conveying rollers 222. Further, the edge sealing mechanism 22 includes at least two edge sealing wheels 221, which are mounted on both sides of the solar cell silicon wafer 1. Preferably, the edge sealing mechanism 22 includes multiple edge sealing wheels 221 to achieve multiple coatings of insulating material on both sides of the solar cell silicon wafer 1, ensuring that the uneven structure of the side portion 11 of the solar cell silicon wafer 1 is filled and sealed by the insulating material and that defects or microcracks on the side portion of the solar cell silicon wafer 1 are repaired.

[0053] In an optional embodiment, see [link to relevant documentation] Figures 1 to 4An upper pressure roller 223 is provided above the second conveying roller 222 of the edge sealing mechanism 22. The second conveying roller 222 and the upper pressure roller 223 of the edge sealing mechanism 22 form an upper and lower clamping structure. On the one hand, the vertical position of the solar cell silicon wafer 1 is fixed by clamping to prevent shaking during the edge sealing operation; on the other hand, the side part 11 of the solar cell silicon wafer 1 is precisely aligned with the edge sealing roller 221.

[0054] In an optional embodiment, see [link to relevant documentation] Figures 1 to 4 The solar cell silicon wafer 1 moves along a first direction between the second conveying roller 222 and the upper pressing roller 223. The two opposite side portions 11 of the solar cell silicon wafer 1 in the first direction form tangential contact with the sealing wheels 221 on both sides of the second conveying roller 222, and drive the sealing wheels 221 to rotate. The multiple sealing wheels 221 on both sides of the second conveying roller 222 are evenly spaced.

[0055] In other embodiments, the sealing wheel 221 is actively driven, rotated by a transmission device (not shown in the figure, but including but not limited to a drive motor). The rotational linear velocity of the sealing wheel 221 can be equal to or different from the transmission linear velocity of the solar cell silicon wafer 1. The rotation direction can be the same as or opposite to the movement direction of the solar cell silicon wafer 1. In these embodiments, by controlling the thickness of the insulating material carried out on the outer surface of the sealing wheel 221, the solar cell silicon wafer 1 can be coated with insulating material in contact with the sealing wheel 221 or without contact with the sealing wheel 221 in the sealing mechanism 22.

[0056] In this embodiment, the two opposite side portions 11 of the solar cell silicon wafer 1 in the first direction form tangential contact with the sealing wheels 221 on both sides of the second conveying roller 222. The driving force of the moving solar cell silicon wafer 1 drives the sealing wheels 221 to rotate, achieving passive rotational coating without additional power. The multiple sealing wheels 221 on both sides of the second conveying roller 222 are evenly spaced, ensuring that the side portions 11 of the solar cell silicon wafer 1 can contact the sealing wheels 221 along their entire length. This allows the insulating material to be uniformly applied to the uneven structure of the side portions 11 of the solar cell silicon wafer 1, ensuring the consistency and integrity of the sealing process.

[0057] To elaborate further, see Figures 1 to 5A small material tank 225 is installed inside the material tank hole 2242 of the edge sealing block 224. The feeding groove 2241 has a feeding port 22411 that communicates with the small material tank 225. The small material tank 225 corresponding to each edge sealing wheel 221 is connected to the large material tank 25 through a conduit for continuously introducing insulating material. The edge sealing wheel 221 and the edge sealing block 224 are mounted on the edge sealing seat 226. The edge sealing wheel 221 is rotatably mounted on the edge sealing seat 226 through a rotating shaft and bearings. The edge sealing block 224 is connected to the edge sealing seat 226 by bolts.

[0058] In this embodiment, when the sealing wheel 221 rotates, its surface insulating material is coated onto the side 11 of the solar cell silicon wafer 1, filling the uneven structure to form a sealing layer. The side of the sealing wheel 221 away from the solar cell silicon wafer 1 rotates past the feeding groove 2241 of the sealing block 224, and is continuously fed by the small material tank 225 through the feeding port 22411. The large material tank 25 is replenished with material through the conduit to ensure that the coating process is uninterrupted.

[0059] Furthermore, see Figures 1 to 5 The edge sealing and repair curing equipment 2 also includes a curing mechanism 23, which includes a third conveying roller 231 arranged along the first direction and adjacent to the second conveying roller 222, an ultraviolet lamp tube arranged above the third conveying roller 231, and a protective cover 232 covering the outside of the ultraviolet lamp tube.

[0060] In this embodiment, the solar cell silicon wafer 1 after edge sealing repair is conveyed by the third conveying roller 231 of the curing mechanism 23, and the insulating material is cured by ultraviolet lamp irradiation. The protective cover 232 can prevent ultraviolet leakage and ensure operation safety and curing effect.

[0061] Furthermore, Figure 7 The diagram shows a structural schematic of the side portion of a solar cell silicon wafer provided in an exemplary embodiment of the present invention. The side portion 11 of the solar cell silicon wafer 1 has an uneven structure, as well as defects or microcracks. Figure 8 The diagram shows the effect of non-contact coating on the side of a solar cell silicon wafer provided by an exemplary embodiment of the present invention. It can be seen that non-contact coating cannot apply the insulating material to the bottom of the side 11 of the solar cell silicon wafer 1, and repeated non-contact coating is also unlikely to apply the insulating material to the bottom of the side 11 of the solar cell silicon wafer 1. Figure 9This diagram illustrates the effect of contact coating on the side edge of a solar cell silicon wafer provided by an exemplary embodiment of the present invention. It shows that after contact coating, the insulating material pre-attached to the surface of the sealing wheel 221 is applied evenly to the side edge 11 of the solar cell silicon wafer 1 during rotation due to contact and compression with the side edge 11. Specifically, the contact compression generated when the solar cell silicon wafer 1 directly contacts the sealing wheel 221 is uniformly applied to the side edge 11. Any uneven structures, defects, or microcracks present on the side edge 11 of the solar cell silicon wafer 1 are filled and repaired by the insulating material, achieving seamless coverage and sealing from the recessed areas to the raised areas. This ensures that the insulating material adheres tightly to the side edge 11 of the solar cell silicon wafer 1, guaranteeing the sealing and repair effect.

[0062] It is worth mentioning that, see Figure 5 The width of the feed groove 2241 from the return end 22412 to the discharge end 22413 gradually decreases, and the thickness of the insulating material on the sealing wheel 221 can be controlled by adjusting the distance between the bottom surface of the discharge end 22413 of the feed groove 2241 and the side surface of the sealing wheel 221.

[0063] In this embodiment, the design of the feed groove 2241, with its width decreasing from the return end 22412 to the discharge end 22413, creates a compression and convergence effect on the insulating material, ensuring that the material adheres evenly to the surface of the sealing wheel 221 during flow. Simultaneously, by adjusting the distance between the bottom surface of the feed groove 2241's discharge end 22413 and the side surface of the sealing wheel 221, the thickness of the insulating material adhering to the sealing wheel 221 can be directly altered. A larger distance results in a thicker insulating material layer, while a smaller distance results in a thinner insulating material layer. When the thickness of the insulating material layer is reduced to a certain extent, the solar cell silicon wafer 1 contacts the sealing wheel 221 simultaneously with the insulating material. The advantage of the solar cell silicon wafer 1 contacting the sealing wheel 221 simultaneously with the insulating material is that it generates a more powerful and uniform compression on the side 11 of the solar cell silicon wafer 1. This allows the insulating material to fill and repair any uneven structures, defects, or microcracks on the side 11 of the solar cell silicon wafer 1, achieving a seamless seal from the recessed areas to the raised areas. This ensures a tight fit between the insulating material and the side 11 of the solar cell silicon wafer 1, guaranteeing the sealing and repair effect. Therefore, this structure not only ensures a uniform supply of insulating material but also allows for flexible adjustment of the coating amount according to process requirements, thereby ensuring the consistency of the sealing thickness and the reliability of the seal on the side 11 of the solar cell silicon wafer 1.

[0064] In some embodiments, the insulating material includes, but is not limited to, UV adhesive. The edge sealing wheel 221 includes, but is not limited to, a silicone edge sealing wheel.

[0065] In this embodiment, the insulating material can be epoxy resin adhesive or silicone sealant in addition to UV adhesive. Correspondingly, the curing mechanism 23 can be a UV curing mechanism or a heat curing mechanism, etc. The edge sealing wheel 221 can be made of silicone or polyurethane or rubber, in addition to silicone.

[0066] It is worth mentioning that the thickness of the sealing wheel 221 is greater than the thickness of the solar cell silicon wafer 1, and the solar cell silicon wafer 1 and the sealing wheel 221 form a tangential contact at the middle position in the thickness direction, and the solar cell silicon wafer 1 and the sealing wheel 221 are on the same horizontal plane.

[0067] In this embodiment, the edge sealing wheel 221 is thicker than the solar cell silicon wafer 1, which ensures that its side completely covers the side portion 11 of the solar cell silicon wafer 1 when it rotates. The two are in tangential contact at the middle position in the thickness direction, which can make the friction force on the solar cell silicon wafer 1 uniformly distributed when it moves, and prevent the solar cell silicon wafer 1 from tilting due to contact offset. The fact that the two are on the same horizontal plane ensures that the solar cell silicon wafer 1 and the edge sealing wheel 221 always remain parallel and attached during dynamic contact, which not only avoids the mechanical stress caused by the height difference that causes the solar cell silicon wafer 1 to break, but also makes the insulating material uniformly stressed when it is squeezed and filled, ensuring that the concave and convex structure of the side portion 11 of the solar cell silicon wafer 1 is completely covered.

[0068] It should be noted that if the inner distance between the limiting rollers 212 on both sides of the first conveying roller 211 is set as a and the inner distance between the sealing rollers 221 on both sides of the second conveying roller 222 is set as b, then a = b is satisfied.

[0069] In this embodiment, the inner distance 'a' between the limiting rollers 212 on both sides of the first conveying roller 211 is set to be equal to the inner distance 'b' between the sealing rollers 221 on both sides of the second conveying roller 222. This ensures that the solar cell silicon wafer 1 remains within a uniform lateral constraint space during the transmission process between the conveying mechanism 21 and the sealing mechanism 22. When the solar cell silicon wafer 1 enters the sealing roller 221 area from between the limiting rollers 212 along the first direction, due to the dimensional correspondence of a=b, the side portion 11 of the solar cell silicon wafer 1 can accurately align with the working position of the sealing roller 221, avoiding the solar cell silicon wafer 1 from shifting or tilting due to spacing deviation.

[0070] More specifically, see Figures 1 to 4 ,and Figure 6The edge sealing repair and curing equipment 2 further includes: a docking rotation mechanism 24, which includes a first docking conveyor belt 241 arranged along a first direction and adjacent to the third conveying roller 231, a rotating bidirectional conveyor belt 242 adjacent to the first docking conveyor belt 241, a rotary motor 243 for driving the rotating bidirectional conveyor belt 242 to rotate, and a second docking conveyor belt 244 arranged along the first direction and adjacent to the rotating bidirectional conveyor belt 242; wherein, the rotating bidirectional conveyor belt 242 includes a first rotating conveyor belt 2421 arranged along the first direction and a second rotating conveyor belt 2422 arranged along the second direction and located inside the first rotating conveyor belt 2421.

[0071] In this embodiment, the third conveying roller 231 of the curing mechanism 23 conveys the solar cell silicon wafer 1 with both sides sealed to the docking rotation mechanism 24. The first docking conveyor belt 241 and the rotating bidirectional conveyor belt 242 form a relay transmission. When the silicon wafer reaches the center position of the rotating bidirectional conveyor belt 242, the rotary motor 243 drives it to rotate 90°, so that the second rotating conveyor belt 2422 is parallel to the initial conveying direction. Then, the silicon wafer is sent to the next station (the next station, namely the conveying mechanism 21, sealing mechanism 22, curing mechanism 23, docking rotation mechanism 24, and large material tank 25 corresponding to the other two opposite sides 11 of the solar cell silicon wafer 1). In this case, through precise position switching and direction adjustment, the continuity of the four-side sealing process of the solar cell silicon wafer 1 is achieved, avoiding positioning deviations caused by manual intervention, and ensuring the consistency of each side sealing process and the efficiency of automated production.

[0072] As a supplementary explanation, the driving force for the aforementioned first conveying roller, second conveying roller, upper pressure roller, third conveying roller, first docking conveyor belt, second docking conveyor belt, first rotating conveyor belt, and second rotating conveyor belt can be provided by a servo motor. The conveying power for the insulating material can be provided by a pressure pump on the large material tank.

[0073] Understandably, see Figure 2 This technical solution enables multiple solar cell silicon wafers 1 to be sealed and cured side by side.

[0074] Next, the working principle of the edge sealing, repair, and curing equipment for solar cell silicon wafers involved in this utility model will be explained.

[0075] The solar cell silicon wafer 1 to be sealed is conveyed by the conveying mechanism 21 of the sealing and repair curing equipment 2 along the first direction to the sealing mechanism 22 of the sealing and repair curing equipment 2. The two opposite side portions 11 of the solar cell silicon wafer 1 in the first direction come into contact with the insulating material on the outer surface of the sealing wheel 221 of the sealing mechanism 22.

[0076] When the sealing wheel 221 rotates, the sealing wheel 221 rotates to discharge material. The insulating material on the sealing wheel 221 is applied to the two opposite side portions 11 of the solar cell silicon wafer 1 in the first direction to fill and seal the uneven structure of the side portions 11 of the solar cell silicon wafer 1 and repair the defects or microcracks of the side portions 11 of the solar cell silicon wafer 1.

[0077] After the two opposite sides 11 of the solar cell silicon wafer 1 in the first direction are sealed and repaired, they are conveyed to the third conveying roller 231 of the curing mechanism 23 and continue to move in the first direction, and are cured by the ultraviolet lamp or infrared lamp above the third conveying roller 231.

[0078] After the two opposite sides 11 of the solar cell silicon wafer 1 in the first direction are cured, the third conveying roller 231 of the curing mechanism 23 conveys the solar cell silicon wafer 1 to the first docking conveyor belt 241 of the docking rotation mechanism 24. The first docking conveyor belt 241 conveys the solar cell silicon wafer 1 to the rotating bidirectional conveyor belt 242 of the docking rotation mechanism 24. When the first rotating conveyor belt 2421 of the rotating bidirectional conveyor belt 242 moves the solar cell silicon wafer 1 to the center position of the rotating bidirectional conveyor belt 242, the rotating bidirectional conveyor belt 242 is driven by the rotating motor 243 to rotate the solar cell silicon wafer 1 as a whole by 90°, so that the second rotating conveyor belt 2422 of the rotating bidirectional conveyor belt 242 is parallel to the first direction. The second rotating conveyor belt 2422 conveys the solar cell silicon wafer 1 to the second docking conveyor belt 244 of the docking rotation mechanism 24. The second docking conveyor belt 244 conveys the solar cell silicon wafer 1 to the next conveying mechanism 21. The above-mentioned edge sealing and curing steps are repeated to seal and cure the remaining two opposite sides 11 of the solar cell silicon wafer 1.

[0079] In summary, this technical solution includes a conveying mechanism comprising a first conveying roller arranged along a first direction; and an edge sealing mechanism comprising a second conveying roller arranged along the first direction and adjacent to the first conveying roller, and edge sealing wheels disposed on both sides of the second conveying roller. Edge sealing blocks are disposed in other areas where the edge sealing wheels do not contact the solar cell silicon wafer. Each edge sealing block has a feeding groove for supplying insulating material. When the edge sealing wheel is rotating, the feeding groove can evenly coat the insulating material onto the outer surface of the edge sealing wheel. After the solar cell silicon wafer to be edge-sealed is conveyed from the first conveying roller area to the second conveying roller area, the insulating material on the outer surface of the edge sealing wheel contacts the side edge of the solar cell silicon wafer to be edge-sealed. In this context, on the one hand, by using contact sealing, the uneven structure on the side of the solar cell silicon wafer is filled and sealed with insulating material, greatly increasing the contact area between the insulating material and the side of the solar cell silicon wafer. This avoids short circuits in the solar cell silicon wafer caused by the peeling of the insulating material and leakage during subsequent electroplating, resulting in a good sealing effect. On the other hand, it enables the repair of defects or microcracks on the side of the solar cell silicon wafer, improving the performance and yield of the solar cell silicon wafer and effectively reducing the risk of breakage.

[0080] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0081] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A sealing and curing device for silicon wafers used in solar cells, characterized in that, The edge sealing repair and curing equipment (2) includes: Conveying mechanism (21), comprising a first conveying roller (211) disposed along a first direction; and The edge sealing mechanism (22) includes a second conveying roller (222) arranged along a first direction and adjacent to the first conveying roller (211), and edge sealing wheels (221) arranged on both sides of the second conveying roller (222). Edge sealing blocks (224) are provided in other areas of the edge sealing wheels (221) that do not contact the solar cell silicon wafer (1). The edge sealing blocks (224) have feeding grooves (2241) for supplying insulating material. When the edge sealing wheels (221) are rotating, the feeding grooves (2241) can uniformly coat the insulating material on the outer surface of the edge sealing wheels (221). In this process, after the solar cell silicon wafer (1) to be sealed is transported from the area of ​​the first conveying roller (211) to the area of ​​the second conveying roller (222), the insulating material on the outer side of the sealing roller (221) comes into contact with the side (11) of the solar cell silicon wafer (1) to be sealed.

2. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The conveying mechanism (21) further includes: limiting rollers (212) disposed on both sides of the first conveying roller (211) to ensure consistency when the first conveying roller (211) is conveyed to the second conveying roller (222).

3. The edge sealing and curing equipment for solar cell silicon wafers according to claim 2, characterized in that, If the inner distance between the limiting rollers (212) on both sides of the first conveying roller (211) is set to a, and the inner distance between the sealing rollers (221) on both sides of the second conveying roller (222) is set to b, then a = b is satisfied.

4. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The sealing mechanism (22) further includes an upper pressure roller (223) disposed above the second conveying roller (222), and the solar cell silicon wafer (1) moves between the second conveying roller (222) and the upper pressure roller (223).

5. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The feeding groove (2241) is formed with a return end (22412) and a discharge end (22413) corresponding to the rotation direction of the sealing wheel (221). The width of the groove from the return end (22412) to the discharge end (22413) of the feeding groove (2241) decreases from large to small.

6. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The sealing block (224) has a small material tank (225) installed in the material tank hole (2242). The feeding groove (2241) has a feeding port (22411) connected to the small material tank (225). Each sealing wheel (221) has a small material tank (225) connected to a large material tank (25) through a conduit for continuously introducing insulating material.

7. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The edge sealing wheel (221) and the edge sealing block (224) are mounted on the edge sealing seat (226). The edge sealing wheel (221) is rotatably mounted on the edge sealing seat (226) through a rotating shaft and bearings. The edge sealing block (224) is connected to the edge sealing seat (226) by bolts.

8. The edge sealing and curing equipment for solar cell silicon wafers according to claim 1, characterized in that, The edge sealing repair and curing equipment (2) also includes: The curing mechanism (23) includes a third conveying roller (231) arranged along a first direction and adjacent to the second conveying roller (222), an ultraviolet lamp tube disposed above the third conveying roller (231), and a protective cover (232) covering the outside of the ultraviolet lamp tube.

9. The edge sealing and curing equipment for solar cell silicon wafers according to claim 8, characterized in that, The edge sealing repair and curing equipment (2) also includes: The docking rotation mechanism (24) includes a first docking conveyor belt (241) arranged along a first direction and adjacent to the third conveying roller (231), a rotating bidirectional conveyor belt (242) adjacent to the first docking conveyor belt (241), a rotary motor (243) for driving the rotating bidirectional conveyor belt (242) to rotate, and a second docking conveyor belt (244) arranged along the first direction and adjacent to the rotating bidirectional conveyor belt (242). The rotating bidirectional conveyor belt (242) includes a first rotating conveyor belt (2421) arranged along a first direction and a second rotating conveyor belt (2422) arranged along a second direction and located inside the first rotating conveyor belt (2421).

10. The edge-sealing repair and curing equipment for solar cell silicon wafers according to any one of claims 1 to 9, characterized in that, The thickness of the sealing wheel (221) is greater than the thickness of the solar cell silicon wafer (1), and the solar cell silicon wafer (1) and the sealing wheel (221) are on the same horizontal plane; the insulating material includes at least UV adhesive; the sealing wheel (221) includes at least silicone sealing wheel.

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