A TopCon solar cell sheet texturing process and device

Abstract

The present invention discloses a TopCon solar cell chip texturing process and device, including the following steps: pre-cleaning, one-time water washing, texturing, two-time water washing, post-cleaning, and three-time water washing the silicon wafer in sequence to obtain the silicon wafer to be pickled; proportioning the pickling solution, the pickling solution adopts a mixture of HCL and HF; injecting the pickling solution into the pickling tank; placing the silicon wafer to be pickled in the pickling tank; heating the pickling solution to control the pickling temperature, and at the same time controlling the pickling time, so that the silicon wafer can achieve the best electrical performance. By adopting the texturing liquid, heating the texturing liquid, and controlling the residence time of the texturing material, the reaction efficiency is improved and the HF dosage is reduced, so as to achieve the purpose of environmental protection, energy saving and high efficiency; by setting the texturing tank assembly, it is divided into a plurality of small texturing tanks according to the use requirements during use, and the temperature of the small texturing tank is controlled by the heating plate, so that the texturing liquid in the small texturing tank reaches the best reaction temperature, thereby improving the reaction rate.

Description

Technical Field

[0001] The invention relates to the field of solar cells, and in particular to a TopCon solar cell sheet texturing process and device. Background Art

[0002] With the improvement of solar cell production technology, the improvement of electrical performance plays a key role in improving the efficiency of solar cells. However, due to the difficulty in promoting the improvement of electrical performance and the high cost of technology upgrade, the new technology cannot be quickly and comprehensively promoted. Therefore, the role of improved optical performance is becoming more and more obvious. The upgrade of printed graphics and screens, the iteration of slurry, and the further reduction of the shading area on the front of the cell, the upgrade of texturing additives make small and uniform velvet surface a reality and further reduce the reflectivity of silicon wafers, and improve the absorption of light.

[0003] In the system of HF and HNO3 mixed acid, silicon can react continuously with the mixed solution. Nitric acid oxidizes silicon into silicon dioxide, which quickly reacts with hydrofluoric acid to form fluorosilicic acid. Therefore, the reacted silicon enters the solution in the form of fluorosilicic acid.

[0004] Chinese patent CN106328734B discloses a method for texturing solar cell silicon wafers, which firstly puts a mixture of HF, HNO3 and water, a mixture of KOH and water, and a mixture of HF, HCl and water into the first slot, the second slot and the third slot of a chain texturing machine respectively, and the volume ratios are: HF:HNO3:water = 1:2.0~3.6:2.4, KOH:water = 7:120~160, HF:HCl:water = 4:3~7:10; the water is all pure water; then the chain texturing machine is started; it does not require other additives to prepare silicon wafers with better uniformity of texturing corrosion pits and higher light absorption rate, and adopts such a liquid adding method in the production process, so that the production continuity is better and the production efficiency is higher, thereby greatly reducing the production cost.

[0005] Chinese patent CN103151423B discloses a texturing and cleaning process for polycrystalline silicon wafers, firstly, the silicon wafer is soaked in a mixed solution of HF and HNO3; the acid-etched silicon wafer is cleaned in pure water; the silicon wafer is placed in an alkaline solution for alkaline corrosion treatment, and a texturing additive is added to the alkaline solution to perform secondary texturing on the silicon wafer; the alkaline-etched silicon wafer is placed in pure water for cleaning; the silicon wafer is soaked in a mixed solution of HCl and HF; the acid-etched silicon wafer is cleaned in pure water; and the treated silicon wafer is dried. This technology can increase the final conversion efficiency of the silicon wafer by 0.2-0.3% and achieve the purpose of superimposing the final efficiency of the battery cell without changing other processes.

[0006] Chinese patent CN111969078B discloses a method for texturing a monocrystalline silicon wafer, comprising the following steps: pre-cleaning the monocrystalline silicon wafer with a first mixed solution, the first mixed solution comprising an alkaline reagent and H2O2 in a mass ratio of 3:8 to 3:10; texturing the monocrystalline silicon wafer; post-cleaning the monocrystalline silicon wafer with a second mixed solution and a mixed acid solution in sequence, and then drying, wherein the second mixed solution comprises an alkaline reagent and H2O2 in a mass ratio of 3:8 to 3:10, and the mixed acid solution comprises hydrofluoric acid and hydrochloric acid in a volume ratio of 2:3 to 2.5:3. It can quickly dehydrate the surface of the silicon wafer, and it is not easy to leave dirt, thereby avoiding the generation of black spots on the silicon wafer, improving the product yield, and thus improving the electrical performance of the battery cell.

[0007] The prior art texturing process requires a large amount of HF, has high processing costs, and causes serious environmental pollution. Summary of the invention

[0008] In view of the problems in the related art, the present invention proposes a TopCon solar cell texturing process and device to overcome the above technical problems existing in the existing related art.

[0009] To this end, the specific technical solution adopted by the present invention is as follows:

[0010] A first aspect: A TopCon solar cell sheet texturing process, comprising the following steps:

[0011] Step 1: Pre-clean, wash once, texturize, wash twice, post-clean, and wash three times to obtain a silicon wafer to be pickled.

[0012] Step 2: Prepare the pickling solution, which is a mixture of HCL and HF.

[0013] Step 3: Pour the pickling solution into the pickling tank.

[0014] Step 4: Place the silicon wafer to be pickled into the pickling tank.

[0015] Step 5: Heat the pickling solution to adjust the pickling temperature and the pickling time so that the silicon wafer can achieve the best electrical properties.

[0016] Step 6: The acid-washed silicon wafer is washed four times, slowly pulled up, and dried to complete the TopCon solar cell texturing.

[0017] Preferably, step five adopts a water-insulated heating method.

[0018] By heating the pickling solution and controlling the residence time of the texturing material, the reaction efficiency is improved. When the silicon wafer achieves the best electrical performance, the HF dosage is reduced to achieve the purpose of environmental protection, energy saving and high efficiency.

[0019] The second aspect: A TopCon solar cell panel texturing device comprises a texturing trough assembly, a partition assembly is arranged inside the texturing trough assembly, a support frame assembly is arranged at the bottom of the texturing trough assembly, a control panel is arranged on the outer wall of the support frame assembly, and a conveying assembly is arranged on the outer wall of the partition frame assembly.

[0020] Preferably, the texturing tank assembly includes a texturing tank, the inner wall of which is provided with several heating tanks, the outer wall of which is provided with a water adding hole, the inner wall of which is provided with a heating plate, the inner wall of which is provided with a heating wire, the inner wall of which is provided with a piston, and the outer wall of which is provided with a sealing groove. Through the setting of the texturing tank assembly, it is divided into a plurality of small texturing tanks according to usage requirements during use, and the temperature of the small texturing tank is controlled by the heating plate to achieve the optimal reaction temperature of the texturing liquid in the small texturing tank, thereby increasing the reaction rate and predicting the utilization rate of the reactants in the texturing liquid.

[0021] Preferably, a plurality of small texturing grooves are formed between the heating groove and the texturing groove.

[0022] Preferably, the support frame assembly includes a connecting frame, a bracket is fixedly connected to the inner wall of the connecting frame, a sleeve is provided at one end of the bracket, and the sleeve is provided in multiple numbers. A large hydraulic rod is provided on the inner wall of the sleeve. Through the setting of the support frame assembly and in conjunction with the use of an electric motor, the use direction of the texturing trough assembly can be rotated as needed to facilitate operation. The setting of the large hydraulic rod can achieve the purpose of facilitating the raising and lowering of the height of the texturing trough assembly, thereby realizing material removal and related operations.

[0023] Preferably, the partition assembly includes an upper bracket, the outer wall of which is fixedly connected to a small hydraulic rod, one end of the small hydraulic rod is fixedly connected to a pulling rack, one end of the pulling rack is fixedly connected to a partition, and an embedded groove is provided on the inner side of the partition. The partition assembly is arranged in conjunction with the texturing trough assembly, wherein the arrangement of the partition can achieve the purpose of completely isolating each small texturing trough. During use, the small texturing trough connection is opened by starting and controlling the small hydraulic rod, thereby achieving the cooperation with the conveying assembly to convey the reactive silicon wafer material from one small texturing trough to another small texturing trough, and enter the next small texturing trough to continue the reaction, so as to achieve continuous texturing operation.

[0024] Preferably, the outer wall of the velvet making groove is fixedly connected to a panel via a fixing pin, and the inner wall of the panel is provided with a rubber ring, and the outer wall of the rubber ring is tightly fitted with the inner wall of the sealing groove. The outer wall of the velvet making groove is fixedly connected to the panel via a fixing pin, and the inner wall of the panel is provided with a rubber ring, and the outer wall of the rubber ring is tightly fitted with the inner wall of the sealing groove, so as to facilitate the disassembly and opening of the velvet making groove assembly, so as to facilitate the material removal and cleaning.

[0025] Preferably, a motor box is provided at the bottom of the support frame assembly, an electric motor is provided on the inner wall of the motor box, the output shaft of the electric motor is fixedly connected to the bottom of the support frame assembly through a coupling, a supporting bracket is provided at the bottom of the support frame assembly, two support plates are provided at the bottom of the support frame assembly, a table is provided at the bottom of the support plate, a lifting seat is provided at the bottom of the table, a base is provided at the bottom of the lifting seat, a gasket is provided at the bottom of the lifting seat, and a guardrail is provided on the outer wall of the lifting seat.

[0026] The outer wall of the support bracket is provided with an auxiliary support plate, and the outer wall of the auxiliary support plate is closely connected to the bottom of the bracket.

[0027] A plurality of gaskets are arranged at the bottom of the base.

[0028] A slide groove is provided on the left side of the base, a storage box is slidably connected to the inner wall of the slide groove, and an annular buckle is provided on the outer wall of the storage box.

[0029] Preferably, the outer wall of the texturing tank is provided with several AC pumps, and the output end and the input end of the AC pump are provided with water pipes, and the water pipes are cross-connected into each heating tank respectively. Through the arrangement of the AC pump and the water pipes, it is convenient to interchange each heating tank as needed to balance the heating temperature in each small texturing tank.

[0030] Preferably, the conveying component includes an outer bracket arranged on the outer wall of the upper bracket, the inner wall of the outer bracket is provided with a micro-hydraulic rod, one end of the micro-hydraulic rod is provided with a connecting slide, the outer wall of the connecting slide is provided with a fitting slide, the outer wall of the fitting slide is fitted and slidably connected with the inner wall of the embedded groove, the bottom of the connecting slide is provided with an ear plate, the inner wall of the ear plate is provided with a connecting shaft rod, the bottom of the connecting slide is movably connected with a storage groove through the ear plate and the connecting shaft rod, through the setting of the conveying component, in use, by starting and controlling the use of the micro-hydraulic rod to pull the connecting slide, so that the storage groove passes through the embedded groove and moves to the outside or inside of the texturing groove assembly, when all the storage grooves are outside the texturing groove assembly, the storage groove is opened to place silicon wafers inside, and then the micro-hydraulic rod is started and controlled to slide inside the texturing groove assembly to achieve the purpose of feeding.

[0031] The beneficial effects of the present invention are:

[0032] 1. The TopCon solar cell texturing process heats the pickling solution and controls the residence time of the texturing material, thereby improving the reaction efficiency and reducing the amount of HF used, so as to achieve the purpose of environmental protection, energy saving and high efficiency. The TopCon solar cell texturing process is used in conjunction with the TopCon solar cell texturing device to achieve the best coordinated use effect and improve the texturing efficiency.

[0033] 2. The TopCon solar cell texturing device is divided into a plurality of small texturing tanks according to the use requirements through the setting of the texturing tank assembly. The temperature of the small texturing tank is controlled by the heating plate to achieve the best reaction temperature of the texturing liquid in the small texturing tank, thereby improving the reaction rate and estimating the utilization rate of the reactants in the texturing liquid.

[0034] Through the setting of the partition assembly and the use in conjunction with the texturing trough assembly, the setting of the partition can achieve complete isolation of each small texturing trough. During use, the small texturing trough connection is opened by starting and controlling the small hydraulic rod, thereby achieving the cooperation with the conveying assembly to convey the reactive silicon wafer material from one small texturing trough to another small texturing trough, and then enter the next small texturing trough to continue the reaction, so as to achieve continuous texturing operation.

[0035] 3. The TopCon solar cell texturing device, through the setting of the support frame assembly and the use of the motor, can rotate the use direction of the texturing tank assembly as needed for easy operation. The setting of the large hydraulic rod can facilitate the height of the texturing tank assembly to be raised and lowered, thereby realizing material removal and related operations.

[0036] 4. The TopCon solar cell texturing device, through the setting of the conveying component, during use, starts and controls the use of the micro hydraulic rod to pull the connecting slide plate, so that the storage slot passes through the embedded slot and moves to the outside or inside of the texturing slot assembly. When the storage slots are all outside the texturing slot assembly, the storage slots are opened to place silicon wafers inside, and then the micro hydraulic rod is started and controlled to slide inside the texturing slot assembly to achieve the purpose of feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The figure is a schematic diagram of the process of TopCon solar cell texturing according to the present invention.

[0039] Figure 2 This is a front view of a TopCon solar cell texturing device according to the present invention.

[0040] Figure 3 It is a rear view of a TopCon solar cell texturing device of the present invention.

[0041] Figure 4The present invention is a schematic diagram of the connection structure of a texturing tank assembly, a spacer assembly and a conveying assembly in a TopCon solar cell texturing device.

[0042] Figure 5 It is a structural schematic diagram of a texturing tank assembly in a TopCon solar cell texturing device of the present invention.

[0043] Figure 6 It is a structural schematic diagram of a support frame assembly in a TopCon solar cell texturing device of the present invention.

[0044] Figure 7 The present invention is a schematic structural diagram of a spacer assembly in a TopCon solar cell texturing device.

[0045] Figure 8 It is a structural schematic diagram of a conveying component in a TopCon solar cell sheet texturing device of the present invention.

[0046] In the figure: 1. base, 2. texturing tank assembly, 201. texturing tank, 202. heating tank, 203. heating plate, 204. piston, 205. sealing tank, 3. support frame assembly, 301. connecting frame, 302. bracket, 303. sleeve, 304. large hydraulic rod, 4. partition frame assembly, 401. pulling frame, 402. embedded tank, 403. partition, 404. upper bracket, 405. small hydraulic rod, 5. AC pump, 6. supporting bracket, 7. control panel, 8. bracket, 9. table, 10. guardrail, 11. gasket, 12. storage box, 13. lifting seat, 14. motor box, 15. conveying assembly, 1501. outer bracket, 1502. micro hydraulic rod, 1503. connecting slide plate, 1504. storage tank. DETAILED DESCRIPTION

[0047] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0048] A TopCon solar cell sheet texturing process, such as Figure 1 As shown, the following steps are included:

[0049] Step 1: Pre-clean, wash once, texturize, wash twice, post-clean, and wash three times to obtain a silicon wafer to be pickled.

[0050] Step 2: Prepare the pickling solution, which is a mixture of HCL and HF.

[0051] Step 3: Pour the pickling solution into the pickling tank.

[0052] Step 4: Place the silicon wafer to be pickled into the pickling tank.

[0053] Step 5: Heat the pickling solution to adjust the pickling temperature. Use the water-insulated heating method and adjust the pickling time. The pickling time can be adjusted by adjusting the time the silicon wafer passes through the pickling tank, that is, adjusting the conveying speed of the conveying mechanism. Heat the bottom of each pickling tank. At the same time, adjust the velvet time to achieve the best electrical properties for the silicon wafer.

[0054] Step 6: The acid-washed silicon wafer is washed four times, slowly pulled up, and dried to complete the TopCon solar cell texturing.

[0055] In this embodiment, the pickling solution is heated and the residence time of the textured material is controlled, thereby improving the reaction efficiency and reducing the amount of HF used, so as to achieve the purpose of environmental protection, energy saving and high efficiency.

[0056] In this embodiment, the pickling temperature is 38° C., the pickling time is 110 s, the HF concentration is 7.76%, and the HCL concentration is 3.39%.

[0057] A TopCon solar cell sheet texturing device, such as Figure 2-Figure 8 As shown, it includes a texturing tank assembly 2, a partition assembly 4 is arranged inside the texturing tank assembly 2, a support frame assembly 3 is arranged at the bottom of the texturing tank assembly 2, a control panel 7 is arranged on the outer wall of the support frame assembly 3, and a conveying assembly 15 is arranged on the outer wall of the partition assembly 4. The control panel 7 is used to control the opening and closing of the heating plate 203 at the bottom of each small texturing tank to achieve the purpose of active temperature control.

[0058] The texturing tank assembly 2 includes a texturing tank 201, the inner wall of which is provided with several heating tanks 202, the outer wall of which is provided with a water adding hole, the inner wall of which is provided with a heating plate 203, the inner wall of which is provided with a heating wire, the inner wall of which is provided with a piston 204, the outer wall of which is provided with a sealing tank 205, and several small texturing tanks are formed between the heating tank 202 and the texturing tank 201; in this embodiment, through the setting of the texturing tank assembly 2, it is divided into a plurality of small texturing tanks according to the use requirements during use, and the temperature of the small texturing tank is controlled by the heating plate 203 to achieve the optimal reaction temperature of the texturing liquid in the small texturing tank, thereby improving the reaction rate and predicting the utilization rate of the reactants in the texturing liquid.

[0059] The support frame assembly 3 includes a connecting frame 301, the inner wall of which is fixedly connected to a bracket 302, a sleeve 303 is provided at one end of the bracket 302, and the number of the sleeves 303 is multiple, and a large hydraulic rod 304 is provided on the inner wall of the sleeve 303; in this embodiment, through the setting of the support frame assembly 3 and the use of the electric motor, the use direction of the texturing trough assembly 2 can be rotated as needed to facilitate operation, and the setting of the large hydraulic rod 304 can achieve a height that is convenient for lifting and lowering the texturing trough assembly 2, thereby realizing material removal and related operations.

[0060] The partition assembly 4 includes an upper bracket 404, the outer wall of which is fixedly connected to a small hydraulic rod 405, one end of which is fixedly connected to a pulling rack 401, one end of which is fixedly connected to a partition 403, and an inner side of the partition 403 is provided with an embedded groove 402; in this embodiment, the partition assembly 4 is arranged in cooperation with the texturing tank assembly 2, wherein the partition 403 is arranged to completely isolate each small texturing tank, and in use, the reaction silicon wafer to be processed is placed on the conveying mechanism, and the small texturing tank connection is opened by starting and controlling the small hydraulic rod 405, thereby realizing the cooperation with the conveying assembly 15 to convey the reaction silicon wafer material from one small texturing tank to another small texturing tank, and enter the next small texturing tank to continue the reaction, so as to achieve continuous texturing operation.

[0061] The outer wall of the velvet making groove 201 is fixedly connected to a panel through a fixing pin, and a rubber ring is provided on the inner wall of the panel, and the outer wall of the rubber ring is tightly fitted with the inner wall of the sealing groove 205; in this embodiment, the outer wall of the velvet making groove 201 is fixedly connected to a panel through a fixing pin, and a rubber ring is provided on the inner wall of the panel, and the outer wall of the rubber ring is tightly fitted with the inner wall of the sealing groove 205, so as to facilitate the disassembly and opening of the velvet making groove assembly 2, so as to facilitate the material removal and cleaning.

[0062] A motor box 14 is provided at the bottom of the support frame assembly 3, and a motor is provided on the inner wall of the motor box 14. The output shaft of the motor is fixedly connected to the bottom of the support frame assembly 3 through a coupling, and a support bracket 6 is provided at the bottom of the support frame assembly 3. Two support plates 8 are provided at the bottom of the support frame assembly 3, and a table 9 is provided at the bottom of the support plate 8. A lifting seat 13 is provided at the bottom of the table 9, and a base 1 is provided at the bottom of the lifting seat 13. A gasket 11 is provided at the bottom of the lifting seat 13, and a guardrail 10 is provided on the outer wall of the lifting seat 13; an auxiliary support plate is provided on the outer wall of the support bracket 6, and the outer wall of the auxiliary support plate is fitted and connected with the bottom of the bracket 302; several gaskets 11 are provided at the bottom of the base 1; a slide groove is provided on the left side of the base 1, and a storage box 12 is slidably connected to the inner wall of the slide groove, and an annular buckle is provided on the outer wall of the storage box 12. In this embodiment, through the arrangement of the above structure, it is possible to control and adjust the use height and use direction of the velvet making trough assembly 2.

[0063] Preferably, the outer wall of the texturing tank 201 is provided with several AC pumps 5, and the output end and the input end of the AC pump 5 are provided with water pipes, and the water pipes are cross-connected into each heating tank 202 respectively; in this embodiment, through the setting of the AC pump 5 and the water pipes, it is convenient to interchange each heating tank 202 as needed to achieve a balanced heating temperature in each small texturing tank.

[0064] Preferably, the conveying assembly 15 includes an outer bracket 1501 arranged on the outer wall of the upper bracket 404, a micro hydraulic rod 1502 is arranged on the inner wall of the outer bracket 1501, a connecting slide 1503 is arranged at one end of the micro hydraulic rod 1502, a fitting slide is arranged on the outer wall of the connecting slide 1503, the outer wall of the fitting slide is fitted and slidably connected with the inner wall of the embedded groove 402, an ear plate is arranged at the bottom of the connecting slide 1503, a connecting shaft rod is arranged on the inner wall of the ear plate, and the bottom of the connecting slide 1503 is connected through the ear plate and the connecting shaft The rod is movably connected to a storage slot 1504. Through the setting of the conveying component 15, during use, the micro-hydraulic rod 1502 is started and controlled to pull the connecting slide 1503, so that the storage slot 1504 passes through the embedded slot 402 and moves to the outside or inside of the texturing slot component 2. When the storage slot 1504 is completely outside the texturing slot component 2, the storage slot 1504 is opened to place silicon wafers inside, and then the micro-hydraulic rod 1502 is started and controlled to slide inside the texturing slot component 2 to achieve the purpose of feeding.

[0065] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0066] In actual application, first, place the silicon wafer to be processed on the conveying mechanism. Different texturing solutions are proportioned according to needs and injected into different texturing tanks. The first and second tanks are used for pre-cleaning, using NaOH and H2O2 solutions to deepen pre-cleaning and remove organic pollution and some mechanical damage layers on the surface of the silicon wafer. The third tank is used for one water washing, using deionized water DI solution. The fourth, fifth and seventh tanks are used for texturing, using NaOH and ADD solutions to remove organic dirt and metal impurities on the surface of the silicon wafer; remove the mechanical damage layer during the silicon wafer cutting process to reduce the composite center; form an uneven velvet surface to increase light absorption. The sixth and eighth tanks are used for secondary water washing, using deionized water DI solution. The ninth tank is used for post-cleaning, using NaOH and H2O2 solutions to remove some organic matter in the additives remaining on the surface of the silicon wafer. The tenth tank is used for tertiary water washing, using deionized water DI solution. The eleventh tank is the pickling tank, which is used for pickling, using HCL and HF solutions to neutralize the residual alkali solution remaining on the surface of the silicon wafer; hydrochloric acid has the dual functions of acid and complexing agent, and chloride ions can form water-soluble complexes with metal ions such as Fe3+, Pt2+, Au3+, Ag+, Cu+, Cd2+, Hg2+, etc. HF can remove the silicon dioxide layer on the surface; and form Si-H passivation bonds with silicon dangling bonds on the surface of the silicon wafer. The twelfth tank is used for four water washings, using deionized water DI solution. The thirteenth tank is used for slow pulling, using deionized water DI solution. The fourteenth to eighteenth tanks are used for drying. The silicon wafer to be processed is placed into the texturing tank, and the texturing tank is heated by using the heating plate 203 controlled by the control panel 7 to increase the reaction between the texturing liquid and the silicon wafer to be reacted. According to the consumption of the reactants in each texturing tank, the conveying component 15 is used in conjunction with the partition component 4, and the micro hydraulic rod 1502 is started and controlled to pull the connecting slide 1503, so that the storage tank 1504 passes through the embedded groove 402 and moves to the outside or inside of the texturing tank component 2. When the storage tank 1504 is completely outside the texturing tank component 2, the storage tank 1504 is opened to the inside. Place the silicon wafer, then start and control the micro hydraulic rod 1502 to slide inside the texturing tank assembly 2 to achieve the purpose of material feeding, start and control the small hydraulic rod 405 to open the small texturing tank connection, so as to achieve the use of the conveying assembly 15; use the micro hydraulic rod 1502 to pull the connecting slide 1503, so that the storage tank 1504 passes through the embedded slot 402 and moves to the outside or inside of the texturing tank assembly 2, and the reaction silicon wafer material in one small texturing tank is transported to another small texturing tank, and enters the next small texturing tank to continue the reaction, so as to achieve continuous texturing operation. Finally, the use height of the device is adjusted by the lifting seat 13, and the use direction of the texturing tank assembly 2 can be rotated as needed through the setting of the support frame assembly 3 and the use of the motor for operation. The setting of the large hydraulic rod 304 can reach a height that is convenient for lifting and lowering the texturing tank assembly 2, so as to achieve material removal and related operations.

[0067] In summary, with the aid of the above technical solution of the present invention, the TopCon solar cell sheet texturing process improves the reaction efficiency and reduces the amount of HF used by using a texturing liquid, heating the texturing liquid, and controlling the residence time of the texturing material, so as to achieve the purpose of environmental protection, energy saving and high efficiency. Through the setting of the texturing tank assembly 2, it is divided into a plurality of small texturing tanks according to the use requirements during use. The temperature of the small texturing tank is controlled by the heating plate 203 to achieve the optimal reaction temperature of the texturing liquid in the small texturing tank, improve the reaction rate, and estimate the utilization rate of the reactants in the texturing liquid. Through the setting of the partition assembly 4, it is used in conjunction with the texturing tank assembly 2, wherein the setting of the partition 403 can achieve complete isolation of each small texturing tank. In use, the connection of the small texturing tank is opened by starting and controlling the small hydraulic rod 405, so as to achieve the transport of the reaction silicon wafer material from one small texturing tank to another small texturing tank in conjunction with the conveying assembly 15, and enter the next small texturing tank to continue the reaction, so as to achieve continuous texturing operation. By setting the support frame assembly 3 and cooperating with the motor, the use direction of the texturing trough assembly 2 can be rotated as needed for operation, wherein the setting of the large hydraulic rod 304 can reach a height that is convenient for lifting and lowering the texturing trough assembly 2, thereby realizing material taking and related operations; by setting the conveying assembly 15, during use, by starting and controlling the use of the micro hydraulic rod 1502, the connecting slide 1503 is pulled to make the storage trough 1504 pass through the embedded groove 402 and move to the outside or inside of the texturing trough assembly 2. When the storage trough 1504 is completely outside the texturing trough assembly 2, the storage trough 1504 is opened to place the silicon wafer inside, and then the micro hydraulic rod 1502 is started and controlled to slide inside the texturing trough assembly 2 to achieve the purpose of material conveying.

[0068] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A TopCon solar cell texturing device, characterized in that: The invention comprises a texturing tank assembly (2), wherein a partition assembly (4) is arranged inside the texturing tank assembly (2), a support frame assembly (3) is arranged at the bottom of the texturing tank assembly (2), a control panel (7) is arranged on the outer wall of the support frame assembly (3), and a conveying assembly (15) is arranged on the outer wall of the partition assembly (4); the texturing tank assembly (2) comprises a texturing tank (201), wherein a plurality of heating tanks (202) are arranged on the inner wall of the texturing tank (201), a water adding hole is opened on the outer wall of the texturing tank (201), a heating plate (203) is arranged on the inner wall of the texturing tank (201), and a heating plate (203) is arranged on the inner wall of the heating plate (203). The inner wall of the water adding hole is provided with a piston (204), and the outer wall of the texturing groove (201) is provided with a sealing groove (205); the support frame assembly (3) comprises a connecting frame (301), the inner wall of the connecting frame (301) is fixedly connected to a bracket (302), one end of the bracket (302) is provided with a sleeve (303), the number of the sleeves (303) is multiple, and the inner wall of the sleeve (303) is provided with a large hydraulic rod (304); the partition frame assembly (4) comprises an upper bracket (404), the outer wall of the upper bracket (404) is fixedly connected to a small hydraulic rod (405), one end of the small hydraulic rod (405) is fixedly connected to the outer wall of the upper bracket (404), and one end of the small hydraulic rod (405) is fixedly connected to the inner wall of the upper bracket (404). The support frame assembly (3) is fixedly connected to a pull frame (401), one end of the pull frame (401) is fixedly connected to a partition (403), and an inner side of the partition (403) is provided with an embedded groove (402); a motor box (14) is arranged at the bottom of the support frame assembly (3), an electric motor is arranged on the inner wall of the motor box (14), and the output shaft of the electric motor is fixedly connected to the bottom of the support frame assembly (3) through a coupling; a support bracket (6) is arranged at the bottom of the support frame assembly (3), two support plates (8) are arranged at the bottom of the support plate (8), a table plate (9) is arranged at the bottom of the table plate (9), and a lifting seat (10) is arranged at the bottom of the table plate (9). 3), a base (1) is provided at the bottom of the lifting seat (13), a gasket (11) is provided at the bottom of the lifting seat (13), and a guardrail (10) is provided on the outer wall of the lifting seat (13); an auxiliary support plate is provided on the outer wall of the support bracket (6), and the outer wall of the auxiliary support plate is closely connected to the bottom of the bracket (302); a plurality of gaskets (11) are provided at the bottom of the base (1); a slide groove is provided on the left side of the base (1), and a storage box (12) is slidably connected to the inner wall of the slide groove, and an annular buckle is provided on the outer wall of the storage box (12); a TopCon solar cell sheet velveting process is adopted, comprising the following steps: Step 1: Pre-clean the silicon wafer, wash it once, make a texture, wash it twice, wash it afterward, and wash it three times to obtain the silicon wafer to be pickled; Step 2: prepare pickling solution, which is a mixture of HCL and HF; Step 3: inject the pickling solution into the pickling tank; Step 4: Place the silicon wafer to be pickled into the pickling tank; Step 5: Heat the pickling solution to adjust the pickling temperature and the pickling time so that the silicon wafer can achieve the best electrical properties; Step 6: The acid-washed silicon wafer is washed four times, slowly pulled up, and dried to complete the TopCon solar cell texturing.

2. A TopCon solar cell texturing device according to claim 1, characterized in that: Step 4: Use water-insulating heating method.

3. A TopCon solar cell texturing device according to claim 2, characterized in that: The outer wall of the texturing groove (201) is fixedly connected to a panel via a fixing pin, and the inner wall of the panel is provided with a rubber ring, and the outer wall of the rubber ring is tightly fitted to the inner wall of the sealing groove (205).

4. A TopCon solar cell texturing device according to claim 3, characterized in that: The outer wall of the texturing tank (201) is provided with a plurality of AC pumps (5), and the output end and the input end of the AC pump (5) are both provided with water pipes, and the water pipes are cross-connected to each heating tank (202).

5. A TopCon solar cell texturing device according to claim 4, characterized in that: The conveying assembly (15) comprises an outer bracket (1501) arranged on the outer wall of the upper bracket (404); a micro hydraulic rod (1502) is arranged on the inner wall of the outer bracket (1501); a connecting slide (1503) is arranged at one end of the micro hydraulic rod (1502); a fitting slide is arranged on the outer wall of the connecting slide (1503); the outer wall of the fitting slide is fitted and slidably connected with the inner wall of the embedded groove (402); an ear plate is arranged at the bottom of the connecting slide (1503); a connecting shaft is arranged on the inner wall of the ear plate; and a storage groove (1504) is movably connected to the bottom of the connecting slide (1503) via the ear plate and the connecting shaft.

Images