A TOPCon crystalline silicon solar cell passivation layer screen printing device and use method thereof

Abstract

The invention discloses a screen printing device for a passivation layer of a TOPCon crystalline silicon solar cell, relates to the technical field of solar photovoltaic cell production, and aims to solve the technical problem that the crystalline silicon slice after manual transfer printing is very easy to touch the silver paste by mistake, causing the silver paste to deform and the screen printing to fail, including a screen printing component, a transmission component and a transfer component, the screen printing component includes a bottom frame and a printer body, the printer body includes a screen frame, a screen plate, a scraper and a printing table, the top surface of the printing table is provided with a plurality of strip slots, the side wall of the printing table is connected with a rack, the side wall of the printing table is connected with a transmission plate, the transmission component includes a motor, a worm and a worm gear, the worm gear is rotatably connected with a wheel frame, the top surface of the wheel frame is connected with the bottom surface of the transmission plate, the transfer component includes a support plate and a bearing plate, and a bracket is arranged above the bearing plate. The present invention has the advantages of improving the screen printing effect of the crystalline silicon slice and avoiding the deformation of the silver paste caused by manual unloading and transfer.

Description

Technical Field

[0001] The invention relates to the technical field of solar photovoltaic cell production, and more specifically to a passivation layer screen printing device for a TOPCon crystalline silicon solar cell. Background Art

[0002] Crystalline silicon solar cells, with their abundant source materials and mature cell technology advantages, occupy more than 90% of the global photovoltaic production market, and play an irreplaceable role in achieving the goals of energy structure transformation and carbon neutrality.

[0003] Carrier recombination in the metal-semiconductor contact region is one of the important factors that restrict the improvement of battery efficiency. By using the passivation contact technology to build an ultra-thin dielectric layer between the metal and c-Si, the silicon surface can be passivated, the probability of carrier recombination can be reduced, the carrier transport channel can be optimized, and the battery efficiency can be improved. The plasma enhanced chemical vapor deposition (PECVD) process is widely favored by the industry due to its technical advantages such as fast film formation speed, good single-sided deposition, good sintering stability, and compatibility with in-situ doping. However, in the PECVD process, due to the need for a large number of ion bombardment during the gas ionization process, it is easy to accumulate numerous interface defects near the surface of the SiO2 tunneling layer. In the existing TOPCON structure, the surface of the tunneling layer SiO2 is directly in contact with the doped polycrystalline (Poly-Si(n+)). Due to the existence of a large number of surface defect states, electrons and holes cannot be effectively separated, and some carriers quickly recombine after crossing the tunneling layer, which reduces the open circuit voltage of the battery and thus affects the conversion efficiency of the battery. A passivation buffer layer is deposited on the surface of the tunneling layer, which effectively avoids the carrier recombination caused by the enrichment of surface defect states in the tunneling layer in the traditional TOPCON structure, significantly improves the passivation performance, and promotes the efficient separation of electrons and holes, thereby improving the battery conversion efficiency.

[0004] The existing TOPCon crystalline silicon solar cell passivation layer screen printing equipment uses a screen printer to print silver paste fine grids on crystalline silicon wafers. After printing, the crystalline silicon wafers need to be manually removed from the screen printer and placed in a high-temperature box to dry the silver paste on the front of the crystalline silicon wafers. During the process of transferring from the screen printer to the high-temperature box, since the silver paste is in liquid state, the crystalline silicon wafers after manual transfer printing are very likely to accidentally touch the silver paste, resulting in deformation of the silver paste and failure of screen printing. In view of this, we propose a TOPCon crystalline silicon solar cell passivation layer screen printing equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a screen printing device for the passivation layer of a TOPCon crystalline silicon solar cell, so as to solve the technical problem that the crystalline silicon wafer after manual transfer printing is very likely to accidentally touch the silver paste, resulting in deformation of the silver paste and failure of screen printing.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a screen printing device for a passivation layer of a TOPCon crystalline silicon solar cell, comprising a screen printing component, a transmission component and a transfer component;

[0007] The screen printing assembly comprises a bottom frame, and a printing machine body is arranged on the top surface of the bottom frame;

[0008] The printing machine body comprises a screen frame, a screen plate is arranged inside the screen frame, a scraper is arranged above the screen plate, and a printing platform is arranged below the screen plate;

[0009] The top surface of the bottom frame is provided with a plurality of slide rails, the bottom of the printing platform is provided with a slider matching the slide rails, and the bottom of the printing platform slides on the slide rails through the slider;

[0010] The top surface of the printing platform is provided with a wafer bin, the top surface of the printing platform is provided with a plurality of strip-shaped slots, the side wall of the printing platform is connected with a rack, the bottom surface of the printing platform is provided with a plurality of wheel rails, and the side wall of the printing platform is connected with a transmission plate;

[0011] The transmission assembly includes a motor 1 arranged in a groove on the top surface of the bottom frame, a worm is arranged at the output end of the motor 1, and two ends of the worm are rotatably connected to fixed blocks of the same structure, and the bottom surface of the fixed block is connected to the top surface of the bottom frame;

[0012] The circumferential side wall of the worm is meshed with a plurality of worm wheels, the worm wheels are rotatably connected to a wheel frame, and the top surface of the wheel frame is connected to the bottom surface of the transmission plate;

[0013] The transfer assembly comprises a plurality of support plates arranged in the groove on the top surface of the bottom frame, the top of the support plate is rotatably connected to a bearing plate, the side wall of the support plate is connected to a transverse plate, the top of the transverse plate is provided with a torsion spring, and the side wall of the transverse plate is provided with a limit plate;

[0014] A bracket is arranged above the carrying plate, and the bracket includes a smooth plate and a plurality of inserting strips matching the strip-shaped slots. A fixing frame is connected to the bottom of the bracket, and a rotating shaft is fixedly connected to the circumferential side wall of the fixing frame. The rotating shaft passes through the side wall of the bottom frame and rotates with the side wall of the bottom frame. A gear 1 matching the rack is arranged at the end of the rotating shaft.

[0015] Preferably, the screen plate is provided with a plurality of printing grooves from top to bottom, and the plurality of printing grooves form a fine grid pattern.

[0016] Preferably, a plurality of scrapers are arranged on the top surface of the transmission plate, a scraper strip is arranged on the top surface of the scraper, and the scraper strip is a semicircular arc curved surface structure made of a flexible material.

[0017] Preferably, the side wall of the bearing plate is a curved structure, and the side wall of the limiting plate is a curved structure matching the side wall of the bearing plate.

[0018] Preferably, two slots are formed on the top surface of the bearing plate, and pulleys matching the wheel rails are arranged in the slots on the top surface of the bearing plate.

[0019] Preferably, the side wall of the printing platform is an arc-shaped structure, and the end of the wheel rail is arranged to be an arc-shaped structure.

[0020] Preferably, the end of the cutting strip is arranged as a flat structure and the bottom surface of the end is arranged as an arc curved surface structure.

[0021] Preferably, a transmission mechanism is arranged on the side of the bracket, and the transmission mechanism includes motor 2 and motor 3. The output end of motor 2 is provided with gear 2, toothed belt 1 and transmission belt 1, and the output end of motor 3 is provided with gear 3, toothed belt 2 and transmission belt 2.

[0022] Preferably, a high temperature box is arranged above the second conveyor belt, and a heating module is arranged inside the high temperature box.

[0023] Preferably, the method for using the passivation layer screen printing device of a TOPCon crystalline silicon solar cell comprises the following steps:

[0024] S1. Preparation work: ensure that the main body of the printer is in normal working condition, prepare the required silver paste, and pour the silver paste into the screen plate, and then place the silicon wafer after silicon nitride deposition in the silicon wafer bin on the top of the printing table;

[0025] S2, printing, through the operation of motor 1, the worm is driven to rotate, and the two worm wheels are further driven to move forward along the direction of the worm, so that the transmission plate moves forward, and the printing table moves forward until the printing table moves to the bottom of the screen plate, and then the main body of the printer works to make the scraper scrape back and forth on the screen plate, so that the silver paste on the screen plate is evenly spread, and penetrates downward into the front of the crystal silicon wafer on the printing table through the printing groove to form a fine grid pattern;

[0026] S3, unloading, after printing is completed, the printing table is driven forward by the rotation of the motor 1. During the forward movement of the printing table, the side wall of the printing table first contacts the side wall of the carrier plate, pushing the carrier plate to rotate around the top of the support plate. At this time, the insert of the bracket is inserted into the strip slot on the printing table, and the printing table continues to move forward until the rack on the side wall of the printing table contacts the gear 1 and meshes with the gear 1. The forward movement of the rack will drive the gear 1 to rotate, further driving the rotating shaft and the fixed frame to rotate, so that the bracket rotates around the rotating shaft, and the bracket drives the insert to lift up and leave the strip slot, and lift the crystal silicon wafer, and the crystal silicon wafer slides along the top surface of the insert to the top surface of the smooth plate, and further slides onto the conveyor belt 1;

[0027] S4, drying, the crystalline silicon wafer is transferred to the conveyor belt 2 through the conveyor belt 1, and then transferred into the high temperature box, and the temperature is increased by the heating module inside the high temperature box, so that the silver paste on the front side of the crystalline silicon wafer is dried at a high temperature, and the crystalline silicon wafer with fine grid printing on the front side is obtained.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention drives the printing table to move forward by rotating the motor 1. During the forward movement of the printing table, the side wall of the printing table first contacts the side wall of the carrier plate, pushing the carrier plate to rotate around the top of the support plate. At this time, the insert of the bracket is inserted into the strip slot on the printing table, and the printing table continues to move forward until the rack on the side wall of the printing table contacts the gear 1 and is meshed with the gear 1. The forward movement of the rack will drive the gear 1 to rotate, further driving the rotation shaft and the fixed frame to rotate, so that the bracket rotates around the rotation shaft, and the bracket drives the insert to lift up and leave the strip slot, and lift the crystal silicon wafer, and the crystal silicon wafer slides along the top surface of the insert toward the smooth The top surface of the plate further slides onto conveyor belt one, and the crystalline silicon wafer is transferred to conveyor belt two through conveyor belt one and passed into the high-temperature box. The heating module inside the high-temperature box is used to heat up the temperature, so that the silver paste on the front side of the crystalline silicon wafer is dried at a high temperature to obtain the crystalline silicon wafer after fine grid printing on the front side. After the crystalline silicon wafer is printed, there is no need for manual unloading and transfer, and it can be directly unloaded and transferred through the transfer component, avoiding manual contact with the crystalline silicon wafer, which may easily cause the crystalline silicon wafer to deform and be contaminated, affecting the effect of screen printing, and solving the problem that the crystalline silicon wafer after manual transfer printing is very easy to accidentally touch the silver paste, causing the silver paste to deform and the screen printing to fail.

[0030] 2. The present invention also designs a scraper with a semi-circular curved surface structure made of flexible material on the top surface of the transmission plate, so that during the process of transferring the crystalline silicon wafer, the scraper on the top surface of the transmission plate can scrape and clean the bottom surface of the screen plate and scrape off the residual silver paste on the bottom surface of the screen plate, which can effectively improve the screen printing effect of the next crystalline silicon wafer and prevent the residual silver paste from merging into the silver paste on the front side of the next crystalline silicon wafer.

[0031] 3. The present invention further improves the smoothness of inserting the insert into the strip slot on the printing table by designing the side wall of the printing table as an arc-shaped structure, and the end of the insert is designed as a flat structure and the bottom surface of the end is set as an arc curved surface structure, thereby avoiding the occurrence of jamming and the vibration caused by the jamming that affects the shape of the silver paste on the front side of the crystalline silicon wafer, and improving the stability of the unloading and transfer of the printed crystalline silicon wafer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2It is a schematic diagram of the top surface structure of the bottom frame of the present invention;

[0034] Figure 3 It is a schematic diagram of the main structure of the printing machine of the present invention;

[0035] Figure 4 It is a schematic diagram of the transmission mechanism structure of the present invention;

[0036] Figure 5 It is a schematic diagram of the disassembly structure of the printing platform of the present invention;

[0037] Figure 6 It is a schematic diagram of the transmission assembly structure of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the printing platform and the transmission plate of the present invention;

[0039] Figure 8 It is a schematic diagram of the bottom structure of the printing platform and the transmission plate of the present invention;

[0040] Fig. 9 It is a schematic diagram of the bracket split structure of the present invention;

[0041] Fig.10 It is an enlarged schematic diagram of the structure at the end of the cutting of the present invention;

[0042] Fig.11 It is a schematic diagram of the structure of the bearing plate of the present invention;

[0043] Fig.12 It is a schematic diagram of the disassembly of the bearing plate structure of the present invention.

[0044] Description of the numbers in the figure:

[0045] 1. Screen printing assembly; 2. Transmission assembly; 3. Transfer assembly; 4. Transmission mechanism;

[0046] 101, bottom frame; 1011, slide rail; 102, printer body; 103, screen frame; 104, screen plate; 105, scraper; 106, printing slot; 107, printing table; 1071, slider; 1072, wafer bin; 1073, strip slot; 1074, rack; 1075, wheel rail; 108, transmission plate; 1081, scraper; 1082, scraper bar;

[0047] 201, motor 1; 202, worm; 203, fixed block; 204, worm wheel; 205, wheel frame;

[0048] 301, support plate; 302, load-bearing plate; 3021, pulley; 303, horizontal plate; 304, torsion spring; 305, limit plate; 306, bracket; 3061, smooth plate; 3062, insert; 307, fixed frame; 308, rotating shaft; 309, gear 1;

[0049] 401. Motor 2; 402. Gear 2; 403. Toothed belt 1; 404. Transmission belt 1; 405. Motor 3; 406. Gear 3; 407. Toothed belt 2; 408. Transmission belt 2; 409. High temperature box. DETAILED DESCRIPTION

[0050] like Figures 1 to 12 As shown, the present invention relates to a screen printing device for a passivation layer of a TOPCon crystalline silicon solar cell, comprising a screen printing component 1, a transmission component 2 and a transfer component 3;

[0051] In the embodiment of the present invention, the screen printing assembly 1 includes a bottom frame 101, a printer body 102 is arranged on the top surface of the bottom frame 101, the printer body 102 includes a screen frame 103, a screen plate 104 is arranged inside the screen frame 103, a scraper 105 is arranged above the screen plate 104, a printing platform 107 is arranged below the screen plate 104, the screen plate 104 is provided with a plurality of printing slots 106 from top to bottom, and the plurality of printing slots 106 form a fine grid pattern, and the bottom frame 103 includes a screen frame 103, a screen plate 104 is arranged inside the screen frame 103, a scraper 105 is arranged above the screen plate 104, a printing platform 107 is arranged below the screen plate 104, and the screen plate 104 is provided with a plurality of printing slots 106 from top to bottom, and the plurality of printing slots 106 form a fine grid pattern. The top surface of the frame 101 is provided with a plurality of slide rails 1011, the bottom of the printing platform 107 is provided with a slider 1071 matching the slide rails 1011, the bottom of the printing platform 107 slides on the slide rails 1011 through the slider 1071, the top surface of the printing platform 107 is provided with a wafer bin 1072, the top surface of the printing platform 107 is provided with a plurality of strip slots 1073, the side wall of the printing platform 107 is connected with a rack 1074, and the bottom surface of the printing platform 107 is provided with a plurality of wheel rails 1071. 075, the side wall of the printing platform 107 is connected to a transmission plate 108, the transmission assembly 2 includes a motor 201 arranged in a groove on the top surface of the bottom frame 101, a worm 202 is arranged at the output end of the motor 201, and both ends of the worm 202 are rotatably connected to fixed blocks 203 of the same structure, the bottom surface of the fixed block 203 is connected to the top surface of the bottom frame 101, and a plurality of worm wheels 204 are meshed on the circumferential side wall of the worm 202, and the worm wheels 204 are rotatably connected to a wheel frame 205, and the wheel frame 20 The top surface is connected to the bottom surface of the transmission plate 108, and a transmission mechanism 4 is arranged on the side of the bracket 306. The transmission mechanism 4 includes a second motor 401 and a third motor 405. The output end of the second motor 401 is provided with a second gear 402, a first toothed belt 403 and a transmission belt 1 404. The output end of the third motor 405 is provided with a third gear 406, a second toothed belt 407 and a second transmission belt 408. A high temperature box 409 is arranged above the second transmission belt 408, and a heating module is arranged inside the high temperature box 409.

[0052] The present invention pours the prepared silver paste onto the screen plate 104, and then places the crystalline silicon wafer after silicon nitride deposition in the crystalline silicon wafer bin 1072 on the top surface of the printing table 107, and drives the worm 202 to rotate through the motor 1 201, and further drives the two worm wheels 204 to move forward along the direction of the worm 202, so that the transmission plate 108 moves forward, and pushes the printing table 107 to move forward until the printing table 107 moves to the bottom of the screen plate 104, and then the printer body 102 works to make the scraper 105 scrape back and forth on the screen plate 104, so as to evenly spread the silver paste on the screen plate 104, and penetrate downward into the front surface of the crystalline silicon wafer on the printing table 107 through the printing groove 106, so as to form a fine grid pattern, without the need for manual operation, thereby avoiding the increase of printing error due to manual operation.

[0053] In the embodiment of the present invention, the transfer assembly 3 includes a plurality of support plates 301 arranged in the groove on the top surface of the bottom frame 101, the top of the support plate 301 is rotatably connected to a bearing plate 302, the side wall of the support plate 301 is connected to a horizontal plate 303, the top of the horizontal plate 303 is provided with a torsion spring 304, the side wall of the horizontal plate 303 is provided with a limit plate 305, a bracket 306 is arranged above the bearing plate 302, the bracket 306 includes a smooth plate 3061 and a plurality of inserting strips 3062 matching the strip-shaped slots 1073, the bottom of the bracket 306 is connected to a fixing frame 307, the circumferential side wall of the fixing frame 307 is fixedly connected to a rotating shaft 308, the rotating shaft 308 passes through the side wall of the bottom frame 101 and is rotatably matched with the side wall of the bottom frame 101, and a gear 309 matching the rack 1074 is arranged at the end of the rotating shaft 308;

[0054] The present invention drives the printing platform 107 to move forward by rotating the motor 101. During the forward movement of the printing platform 107, the side wall of the printing platform 107 first contacts the side wall of the carrier plate 302, pushing the carrier plate 302 to rotate around the top of the support plate 301. At this time, the insertion strip 3062 of the bracket 306 is inserted into the bar-shaped slot 1073 on the printing platform 107, and the printing platform 107 continues to move forward until the rack 1074 on the side wall of the printing platform 107 contacts the gear 1 309 and is meshed with the gear 1 309. The forward movement of the rack 1074 drives the gear 1 309 to rotate, further drives the rotation shaft 308 and the fixed frame 307 to rotate, so that the bracket 306 rotates around the rotation shaft 308, and the bracket 306 rotates. 06 drives the insert 3062 to be lifted upward, leaving the strip slot 1073, and lifts the crystal silicon wafer. The crystal silicon wafer slides along the top surface of the insert 3062 to the top surface of the smooth plate 3061, and further slides onto the conveyor belt 1 404. The crystal silicon wafer is transferred to the conveyor belt 2 408 through the conveyor belt 1 404, and is transferred into the high-temperature box 409. The heating module inside the high-temperature box 409 is used to heat the crystal silicon wafer, so that the silver paste on the front side of the crystal silicon wafer is dried at a high temperature to obtain the crystal silicon wafer after the front side fine grid is printed. After the printing of the crystal silicon wafer is completed, there is no need for manual unloading and transfer. The unloading and transfer can be directly performed through the transfer component 3, thereby avoiding manual contact with the crystal silicon wafer, which may easily cause the crystal silicon wafer to deform and be contaminated, thereby affecting the effect of screen printing.

[0055] As another embodiment of the present invention, a plurality of scrapers 1081 are arranged on the top surface of the transmission plate 108, and a scraper strip 1082 is arranged on the top surface of the scraper strip 1081, and the scraper strip 1082 is a semi-circular curved surface structure made of a flexible material; the present invention designs a scraper strip 1082 with a semi-circular curved surface structure made of a flexible material on the top surface of the transmission plate 108, so that during the process of unloading and transferring the crystalline silicon wafer, the scraper strip 1082 on the top surface of the transmission plate 108 can scrape and clean the bottom surface of the screen plate 104, and scrape off the residual silver paste on the bottom surface of the screen plate 104, which can effectively improve the screen printing effect of the next crystalline silicon wafer and prevent the residual silver paste from merging into the silver paste on the front side of the next crystalline silicon wafer.

[0056] As another embodiment of the present invention, the side wall of the supporting plate 302 is a curved structure, and the side wall of the limiting plate 305 is a curved structure that matches the side wall of the supporting plate 302. When the printing table 107 leaves the bracket 306 for reset, the supporting plate 302 is subjected to the elastic force of the torsion spring 304 and rotates to the side wall of the limiting plate 305. At this time, the top of the supporting plate 302 can effectively support the bracket 306.

[0057] As another embodiment of the present invention, two grooves are provided on the top surface of the supporting plate 302, and pulleys 3021 matching the wheel rails 1075 are arranged in the grooves on the top surface of the supporting plate 302. When the printing table 107 moves to the top of the supporting plate 302, it can slide on the wheel rails 1075 at the bottom of the printing table 107 through the pulleys 3021 on the supporting plate 302, thereby improving the smoothness of the movement of the printing table 107 and avoiding friction between the bottom of the printing table 107 and the top surface of the supporting plate 302, which may cause damage.

[0058] As another embodiment of the present invention, the side wall of the printing table 107 is an arc-shaped structure, the end of the wheel rail 1075 is set to an arc-shaped structure, the end of the inserting strip 3062 is set to a flat structure and the bottom surface of the end is set to an arc-shaped curved surface structure; the present invention designs the side wall of the printing table 107 to be an arc-shaped structure, and the end of the inserting strip 3062 is designed to be a flat structure and the bottom surface of the end is set to be an arc-shaped curved surface structure, which can further improve the smoothness of inserting the inserting strip 3062 into the strip slot 1073 on the printing table 107, avoid the occurrence of jamming and the vibration caused by the jamming that affects the shape of the silver paste on the front side of the crystal silicon wafer, and improve the stability of the unloading and transfer of the printed crystal silicon wafer.

[0059] Working principle: This embodiment provides a TOPCon crystalline silicon solar cell passivation layer screen printing device. When in use, ensure that the printer body 102 is in normal working condition, prepare the required silver paste, and pour the silver paste onto the screen plate 104, then place the crystalline silicon wafer after silicon nitride deposition in the crystalline silicon wafer bin 1072 on the top surface of the printing table 107, and drive the worm 202 to rotate through the motor 1 201, and further drive the two worm wheels 204 to move forward along the direction of the worm 202, so that the transmission plate 108 moves to the right. The printing platform 107 moves forward, pushing the printing platform 107 forward until the printing platform 107 moves under the screen plate 104, and then the printing machine body 102 works to make the scraper 105 scrape back and forth on the screen plate 104 to evenly spread the silver paste on the screen plate 104 and penetrate downward into the front of the crystal silicon wafer on the printing platform 107 through the printing groove 106 to form a fine grid pattern. After the printing is completed, the printing platform 107 continues to move forward through the rotation of the motor 201. During the process of the printing platform 107 moving forward, the side of the printing platform 107 The wall first contacts the side wall of the carrier plate 302, pushing the carrier plate 302 to rotate around the top of the support plate 301. At this time, the insertion strip 3062 of the bracket 306 is inserted into the bar-shaped slot 1073 on the printing platform 107, and the printing platform 107 continues to move forward until the rack 1074 on the side wall of the printing platform 107 contacts the gear 1 309 and is meshed with the gear 1 309. The forward movement of the rack 1074 will drive the gear 1 309 to rotate, and further drive the rotation shaft 308 and the fixed frame 307 to rotate, so that the bracket 306 Rotating around the rotating shaft 308, the bracket 306 drives the inserting strip 3062 to be lifted upward and leave the strip-shaped slot 1073, and lifts the crystalline silicon wafer. The crystalline silicon wafer slides along the top surface of the inserting strip 3062 to the top surface of the smooth plate 3061, and further slides onto the conveyor belt 1 404. The crystalline silicon wafer is transferred to the conveyor belt 2 408 through the conveyor belt 1 404, and is transferred into the high-temperature box 409. The heating module inside the high-temperature box 409 heats up the temperature, so that the silver paste on the front side of the crystalline silicon wafer is dried at a high temperature, and the crystalline silicon wafer with fine grid printing on the front side is obtained.

[0060] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A screen printing device for the passivation layer of a TOPCon crystalline silicon solar cell, characterized in that: It comprises a screen printing component (1), a transmission component (2) and a transfer component (3); The screen printing assembly (1) comprises a bottom frame (101), and a printing machine body (102) is arranged on the top surface of the bottom frame (101); The printing machine body (102) comprises a screen frame (103), a screen plate (104) is arranged inside the screen frame (103), a scraper (105) is arranged above the screen plate (104), and a printing platform (107) is arranged below the screen plate (104); The top surface of the bottom frame (101) is provided with a plurality of slide rails (1011), the bottom of the printing platform (107) is provided with a slider (1071) matching the slide rails (1011), and the bottom of the printing platform (107) is slidably matched on the slide rails (1011) through the slider (1071); The top surface of the printing platform (107) is provided with a silicon wafer bin (1072), the top surface of the printing platform (107) is provided with a plurality of bar-shaped slots (1073), the side wall of the printing platform (107) is connected with a rack (1074), the bottom surface of the printing platform (107) is provided with a plurality of wheel rails (1075), and the side wall of the printing platform (107) is connected with a transmission plate (108); The transmission assembly (2) comprises a motor 1 (201) arranged in a groove on the top surface of the bottom frame (101); a worm (202) is arranged at the output end of the motor 1 (201); two ends of the worm (202) are rotatably connected to fixed blocks (203) of the same structure; the bottom surface of the fixed block (203) is connected to the top surface of the bottom frame (101); The circumferential side wall of the worm (202) is meshed with a plurality of worm wheels (204), the worm wheels (204) are rotatably connected to a wheel frame (205), and the top surface of the wheel frame (205) is connected to the bottom surface of the transmission plate (108); The transfer assembly (3) comprises a plurality of support plates (301) arranged in the groove on the top surface of the bottom frame (101), the top of the support plate (301) is rotatably connected to a bearing plate (302), the side wall of the support plate (301) is connected to a transverse plate (303), the top of the transverse plate (303) is provided with a torsion spring (304), and the side wall of the transverse plate (303) is provided with a limit plate (305); A bracket (306) is arranged above the bearing plate (302), and the bracket (306) comprises a smooth plate (3061) and a plurality of inserting strips (3062) matching the strip-shaped slots (1073); a fixing frame (307) is connected to the bottom of the bracket (306); a rotating shaft (308) is fixedly connected to the circumferential side wall of the fixing frame (307); the rotating shaft (308) passes through the side wall of the bottom frame (101) and is rotatably matched with the side wall of the bottom frame (101); a gear (309) matching the rack (1074) is arranged at the end of the rotating shaft (308); A transmission mechanism (4) is arranged on the side of the bracket (306), and the transmission mechanism (4) includes a second motor (401) and a third motor (405). The output end of the second motor (401) is provided with a second gear (402), a first toothed belt (403) and a first transmission belt (404). The output end of the third motor (405) is provided with a third gear (406), a second toothed belt (407) and a second transmission belt (408). A high temperature box (409) is arranged above the second transmission belt (408), and a heating module is arranged inside the high temperature box (409).

2. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 1, characterized in that: The screen plate (104) is provided with a plurality of printing grooves (106) from top to bottom, and the plurality of printing grooves (106) form a fine grid pattern.

3. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 2, characterized in that: The top surface of the transmission plate (108) is provided with a plurality of scrapers (1081), and the top surface of the scrapers (1081) is provided with a scraper strip (1082), and the scraper strip (1082) is a semicircular curved surface structure made of a flexible material.

4. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 3, characterized in that: The side wall of the bearing plate (302) is a curved structure, and the side wall of the limiting plate (305) is a curved structure that matches the side wall of the bearing plate (302).

5. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 4, characterized in that: Two slots are formed on the top surface of the bearing plate (302), and pulleys (3021) matching the wheel rail (1075) are arranged in the slots on the top surface of the bearing plate (302).

6. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 5, characterized in that: The side wall of the printing platform (107) is an arc-shaped structure, and the end of the wheel track (1075) is arranged to be an arc-shaped structure.

7. The passivation layer screen printing device of TOPCon crystalline silicon solar cell according to claim 6, characterized in that: The end of the insert (3062) is configured as a flat structure and the bottom surface of the end is configured as an arc curved surface structure.

8. The method for using the screen printing device for the passivation layer of a TOPCon crystalline silicon solar cell according to claim 7, characterized in that: The following steps are involved: S1, preparation work, ensuring that the printer body (102) is in normal working condition, preparing the required silver paste, and pouring the silver paste onto the screen plate (104), and then placing the crystalline silicon wafer after silicon nitride deposition in the crystalline silicon wafer bin (1072) on the top surface of the printing platform (107); S2, printing, through the operation of the motor 1 (201), the worm (202) is driven to rotate, and the two worm wheels (204) are further driven to move forward along the direction of the worm (202), so that the transmission plate (108) moves forward, and the printing platform (107) is pushed forward until the printing platform (107) moves below the screen plate (104), and then the printing machine body (102) is operated to make the scraper (105) scrape back and forth on the screen plate (104), so that the silver paste on the screen plate (104) is evenly spread, and penetrates downward into the front side of the crystalline silicon wafer on the printing platform (107) through the printing groove (106), forming a fine grid pattern; S3, after unloading and printing is completed, the printing platform (107) is driven to move forward by the rotation of the motor 1 (201). During the forward movement of the printing platform (107), the side wall of the printing platform (107) first contacts the side wall of the carrier plate (302), pushing the carrier plate (302) to rotate around the top of the support plate (301). At this time, the insertion strip (3062) of the bracket (306) is inserted into the strip slot (1073) on the printing platform (107), and the printing platform (107) continues to move forward until the rack (1074) on the side wall of the printing platform (107) The rack (1074) contacts the gear one (309) and meshes with the gear one (309). The forward movement of the rack (1074) drives the gear one (309) to rotate, further drives the rotating shaft (308) and the fixing frame (307) to rotate, and causes the bracket (306) to rotate around the rotating shaft (308). The bracket (306) drives the inserting strip (3062) to lift upward and leave the strip-shaped slot (1073), and lift the crystal silicon wafer. The crystal silicon wafer slides along the top surface of the inserting strip (3062) to the top surface of the smooth plate (3061), and further slides onto the conveyor belt one (404); S4, drying, the crystalline silicon wafer is transferred to the conveyor belt 2 (408) via the conveyor belt 1 (404), and then transferred into the high temperature box (409), and the temperature is increased by the heating module inside the high temperature box (409), and the silver paste on the front side of the crystalline silicon wafer is dried to obtain the crystalline silicon wafer after the front side fine grid printing.

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