BC battery production equipment and production process

Abstract

The present invention discloses a BC battery production equipment and production process, belonging to the technical field of BC battery production. The BC battery production equipment includes a machine, a drying ramp and a liquid storage tank; a placement box is fixedly installed on the machine, and a heating box, an air return box and a fan are sequentially installed inside the machine, the input end of the fan is connected to the inside of the air return box, and the output end of the fan is connected to the inside of the heating box. The present invention can directly take out the silicon wafer from the flower basket after pure water cleaning, remove most of the water by dipping and sucking the surface of the silicon wafer, and then automatically perform contactless transmission and drying on the silicon wafer, so that the silicon wafer can be fully and quickly dried without dead angles, greatly shortening the time of the silicon wafer texturing process and improving the production efficiency of BC batteries; during the contactless transmission and drying process, a boron source can also be fully coated on the surface of the silicon wafer and dried synchronously, so as to directly proceed to the next step of the boron diffusion process, increase the continuity between processes, and further improve production efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of BC battery production, and specifically relates to a BC battery production device and production process. Background Art

[0002] BC cells, also known as back-contact cells, are distinguished by their lack of grid lines on the front and an interdigitated electrode layout on the back. This design reduces light obstruction by the metal electrodes on the front, thereby improving photoelectric conversion efficiency. Compared to conventional cells, BC cells require more manufacturing steps and require higher precision. This directly leads to low production efficiency, becoming the biggest obstacle to their market share.

[0003] At present, although the production efficiency of BC batteries has been significantly improved by optimizing process equipment, there are still process defects in the production process that hinder the further improvement of its production efficiency. For example: texturing is the first step in the production of BC batteries. The last step of texturing is to transfer the flower basket from the pure water tank to the drying tank for direct drying. However, due to the large amount of water attached to the silicon wafer and the flower basket, especially the contact area between the silicon wafer and the flower basket, a large amount of water will remain. It takes a long time to completely dry it, which seriously affects the production efficiency of BC batteries.

[0004] Therefore, in response to the above technical problems, it is necessary to provide a BC battery production equipment and production process.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a BC battery production equipment and production process, which can solve the problem that due to the large amount of water attached to the silicon wafers and the flower baskets, especially the contact parts between the silicon wafers and the flower baskets, a large amount of water will remain, and it takes a long time to completely dry them, which seriously affects the production efficiency of BC batteries.

[0007] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions:

[0008] A BC battery production device, including a machine platform, a drying ramp and a liquid storage tank;

[0009] A placement box is fixedly installed on the machine, and a heating box, a return air box and a fan are installed in sequence inside the machine. The input end of the fan is connected to the inside of the return air box, and the output end of the fan is connected to the inside of the heating box;

[0010] The drying ramp is arranged in an inclined shape above the machine, and an upper transmission belt and a lower transmission belt are installed at one end of the drying ramp close to the machine, and one end of the lower transmission belt extends to the outside of the drying ramp; a first absorption sponge layer is fixedly installed on the upper transmission belt, and a second absorption sponge layer is fixedly installed on the lower transmission belt, and the first absorption sponge layer and the second absorption sponge layer can absorb water from the upper and lower surfaces of the silicon wafer respectively, and a water squeezing and collecting mechanism is installed on the drying ramp, and the water squeezing and collecting mechanism is used to remove water absorbed by the first absorption sponge layer and the second absorption sponge layer;

[0011] An upper air blowing assembly and a lower air blowing assembly are fixedly mounted on the upper and lower ends of the drying ramp, respectively. A main air inlet pipe is fixedly mounted on the heating box. Both the upper air blowing assembly and the lower air blowing assembly are connected to the interior of the main air inlet pipe. The air blowing pressure of the upper air blowing assembly is lower than that of the lower air blowing assembly.

[0012] The liquid storage tank is fixedly mounted on the machine platform, and liquid boron source is stored inside the liquid storage tank. Boron source spraying mechanisms are installed on both the upper air blowing assembly and the lower air blowing assembly;

[0013] Air return components are fixedly installed on both side walls of the drying ramp, and the air return components are connected to the interior of the air return box.

[0014] In one or more embodiments of the present invention, the upper air blowing assembly includes an upper air blowing hood, which is fixedly mounted on the top of the drying ramp. The upper end surface of the drying ramp is provided with a plurality of upwardly inclined openings. The interior of the upper air blowing hood is connected to the interior of the drying ramp through the plurality of upwardly inclined openings. An upper air supply pipeline is fixedly mounted on the upper air blowing hood, and one end of the upper air supply pipeline is fixedly mounted on the main air inlet pipe.

[0015] The lower air blowing assembly includes a lower air blowing hood, which is fixedly mounted on the bottom end of the drying ramp. The lower end surface of the drying ramp is provided with a plurality of downwardly inclined openings. The interior of the lower air blowing hood is connected to the interior of the drying ramp through the plurality of downwardly inclined openings. A lower air supply pipeline is fixedly mounted on the lower air blowing hood, and one end of the lower air supply pipeline is fixedly mounted on the main air inlet pipe.

[0016] A plurality of the downwardly inclined openings match a plurality of the upwardly inclined openings;

[0017] A first flow valve is fixedly installed on both the upper air supply pipeline and the lower air supply pipeline.

[0018] In one or more embodiments of the present invention, a sheet guide is installed at one end of the drying ramp away from the placement box, and a lower flat opening is provided on the lower end surface of the drying ramp close to the sheet guide.

[0019] In one or more embodiments of the present invention, the return air assembly includes a pair of air collecting hoods, which are respectively fixedly mounted on the two side walls of the drying ramp. A number of air outlet holes are provided on the two side walls of the drying ramp. The interior of the air collecting hood is connected to the interior of the drying ramp through the number of air outlet holes. A return air pipe is fixedly mounted between the air collecting hood and the return air box.

[0020] In one or more embodiments of the present invention, a pair of gas-liquid separators are fixedly installed inside the return air box, one end of the pair of return air pipes passes through the interior of the return air box and is connected to the interior of the gas-liquid separator, an air extraction port is opened near the bottom of one side of the gas-liquid separator, and a water collecting box is fixedly installed at the bottom of the gas-liquid separator;

[0021] The return air box is fixedly mounted with a pair of filter screens, which are respectively located on one side of a pair of gas-liquid separators.

[0022] In one or more embodiments of the present invention, the boron source spraying mechanism includes multiple groups of upper atomizing nozzles and multiple groups of lower atomizing nozzles, the multiple groups of upper atomizing nozzles are fixedly installed near the middle of the upper air blowing hood, and the multiple groups of lower atomizing nozzles are fixedly installed near the middle of the lower air blowing hood;

[0023] A liquid pump is fixedly mounted on the liquid storage tank, the output end of the liquid pump is inserted into the liquid storage tank, a main liquid inlet pipe is fixedly mounted on the output end of the liquid pump, a lower liquid supply pipeline and an upper liquid supply pipeline are connected in parallel to the main liquid inlet pipe, a second flow valve is fixedly mounted on both the lower liquid supply pipeline and the upper liquid supply pipeline, the lower liquid supply pipeline is matched with multiple groups of lower atomizing nozzles, and the upper liquid supply pipeline is matched with multiple groups of upper atomizing nozzles;

[0024] The upper air supply pipeline and the lower air supply pipeline are both fixedly installed with bronchi. The bronchi on the upper air supply pipeline match multiple groups of upper atomizing nozzles, and the bronchi on the lower air supply pipeline match multiple groups of lower atomizing nozzles.

[0025] In one or more embodiments of the present invention, the squeezed water collection mechanism includes at least two groups of squeeze tubes, at least two groups of squeeze tubes are rotatably installed inside the drying ramp, and at least two groups of squeeze tubes are tightly attached to the outer surfaces of the upper transmission belt and the lower transmission belt respectively.

[0026] In one or more embodiments of the present invention, a suction pump is fixedly installed on the placement box, a suction pipeline is fixedly installed on the input end of the suction pump, and at least two groups of the extrusion tubes are connected to the suction pipeline;

[0027] A plurality of water absorption holes are provided on the surfaces of at least two groups of the extruded tubes.

[0028] In one or more embodiments of the present invention, a supporting mesh plate is fixedly installed near the top of the placement box, and the output end of the suction pump is connected to the interior of the placement box.

[0029] In one or more embodiments of the present invention, a BC battery production process includes the following steps:

[0030] S1. After the texturing is completed, grab the flower basket from the pure water tank at the end of the texturing equipment and place it on the supporting mesh plate to control the water;

[0031] S2. Sequentially grab the silicon wafers from the basket and place them on the second absorbent sponge layer. The silicon wafers are then conveyed onto the second absorbent sponge layer into the drying ramp. The first and second absorbent sponge layers absorb water from the upper and lower surfaces of the silicon wafers, respectively, to initially remove most of the water from the silicon wafer surfaces.

[0032] S3, by blowing air up and down, the silicon wafer is suspended inside the drying ramp, and the silicon wafer's own gravity is used to move it diagonally downward, achieving non-contact preliminary drying of the silicon wafer surface during the movement;

[0033] S4. When the silicon wafer moves through the upper atomizing nozzle and the lower atomizing nozzle, the boron source is sprayed on its surface, and then it continues to move and dry. After drying, it uses inertia to move to the wafer guide and is transferred to the next process.

[0034] Compared with the existing technology, the present invention can directly take the silicon wafer out of the flower basket after pure water cleaning, remove most of the water by dipping and sucking the surface of the silicon wafer, and then automatically perform contactless transmission and drying on the silicon wafer, so that the silicon wafer can be dried quickly and efficiently without dead angles, greatly shortening the silicon wafer texturing process time and improving the production efficiency of BC batteries; during the contactless transmission and drying process, the boron source can also be fully coated on the silicon wafer surface and dried simultaneously, so as to directly proceed to the next step of boron diffusion process, increase the continuity between processes, and further improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a structural diagram of a BC battery production device in one embodiment of the present invention;

[0037] Figure 2 A cross-sectional view of a BC battery production device according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the working state of a BC battery production device in one embodiment of the present invention;

[0039] Figure 4 A side view of a BC battery production device according to an embodiment of the present invention;

[0040] Figure 5 This is a structural diagram of an upper atomizing nozzle of a BC battery production equipment in one embodiment of the present invention;

[0041] Figure 6 A BC battery production device according to an embodiment of the present invention Figure 1 Enlarged view of point A in the middle;

[0042] Figure 7 This is a schematic structural diagram of an upper transmission belt and a lower transmission belt of a BC battery production device in one embodiment of the present invention;

[0043] Figure 8 This is a structural diagram of an extruded tube of a BC battery production device according to one embodiment of the present invention;

[0044] Figure 9 This is a partially enlarged structural diagram of a BC battery production equipment in one embodiment of the present invention.

[0045] Description of main reference numerals:

[0046] 10. Drying ramp; 101. Downward sloping opening; 102. Lower flat opening; 103. Air outlet; 104. Upward sloping opening; 11. Upper air hood; 111. Upper atomizing nozzle; 12. Air collecting hood; 121. Air return pipe; 13. Lower air hood; 131. Lower atomizing nozzle; 20. Heating box; 21. Main air inlet pipe; 22. Upper air supply line; 23. Bronchial pipe; 24. Lower air supply line; 25. First flow valve; 30. Liquid storage tank; 31. Liquid pump; 32. Main liquid inlet pipe; 33. Lower liquid supply pipeline; 34. Upper liquid supply pipeline; 35. Second flow valve; 40. Return air box; 41. Gas-liquid separator; 42. Water collecting box; 43. Filter; 50. Sheet guide; 60. Machine table; 61. Placement box; 611. Supporting mesh plate; 70. Fan; 80. Upper transmission belt; 81. First dipping and absorbing sponge layer; 90. Lower transmission belt; 91. Second dipping and absorbing sponge layer; 100. Extrusion tube; 1001. Water absorption hole; 1002. Suction pipeline; 1003. Suction pump. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0048] like Figures 1-9 As shown, a BC battery production device according to one embodiment of the present invention is used to process silicon wafers for producing BC battery cells, and includes a drying ramp 10, a heating box 20, a liquid storage tank 30, an air return box 40, a wafer guide 50, and a machine platform 60. A placement box 61 is fixedly mounted on one side of the top of the machine platform 60. A support mesh 611 is fixedly mounted near the top of the placement box 61. After texturing, the flower basket can be removed from the pure water tank at the end of the texturing equipment and placed on the support mesh 611 for water control.

[0049] like Figure 2 and Figure 7 As shown, the drying ramp 10 is arranged above the machine 60 in an inclined shape, and the inclination angle can be 10-15 degrees. An upper transmission belt 80 and a lower transmission belt 90 are installed at one end of the drying ramp 10 close to the machine 60. The length of the lower transmission belt 90 is greater than that of the upper transmission belt 80, ensuring that one end of the lower transmission belt 90 extends to the outside of the drying ramp 10 to facilitate the access to the silicon wafers.

[0050] A first absorbent sponge layer 81 is fixedly installed on the outer surface of the upper transmission belt 80, and a second absorbent sponge layer 91 is fixedly installed on the outer surface of the lower transmission belt 90. There is a gap between the lower end surface of the first absorbent sponge layer 81 and the upper end surface of the second absorbent sponge layer 91. The height of the gap is not greater than the thickness of the silicon wafer, ensuring that the first absorbent sponge layer 81 and the second absorbent sponge layer 91 can contact the surface of the silicon wafer, thereby absorbing water on the surface of the silicon wafer.

[0051] Specifically, the upper transmission belt 80 and the lower transmission belt 90 continue to run synchronously at the same speed. At this time, the silicon wafer in the flower basket can be grabbed by a robot and placed horizontally on the second absorbent sponge layer 91. When the silicon wafer passes through the gap between the first absorbent sponge layer 81 and the second absorbent sponge layer 91, since the first absorbent sponge layer 81 and the second absorbent sponge layer 91 run synchronously at the same speed, the silicon wafer will be transmitted synchronously with the first absorbent sponge layer 81 and the second absorbent sponge layer 91 when passing, and no friction will be generated to prevent damage to the silicon wafer. During the transmission process, the first absorbent sponge layer 81 and the second absorbent sponge layer 91 can absorb the moisture on the surface of the silicon wafer, thereby removing most of the water on the surface of the silicon wafer.

[0052] Among them, Figure 7 and Figure 8As shown in the figure, a water squeezing and collecting mechanism is installed on the drying ramp 10, and the water squeezing and collecting mechanism includes at least two groups of squeezing tubes 100. The at least two groups of squeezing tubes 100 are rotatably installed inside the drying ramp 10. During the operation, the upper end faces of the upper transmission belt 80 and the lower transmission belt 90 will pass through the at least two groups of squeezing tubes 100 respectively, so that the at least two groups of squeezing tubes 100 can respectively be tightly attached to the outer surfaces of the upper transmission belt 80 and the lower transmission belt 90 and squeeze the first and second absorbent sponge layers 81 and 91 to squeeze out the water absorbed by the first and second absorbent sponge layers 81 and 91.

[0053] like Figure 9 As shown, a suction pump 1003 is fixedly mounted on the storage box 61, and a suction pipeline 1002 is fixedly mounted on the input end of the suction pump 1003. One end of at least two sets of extrusion tubes 100 are rotatably mounted on the suction pipeline 1002 and are connected to the interior of the suction pipeline 1002. The surfaces of the at least two sets of extrusion tubes 100 are each provided with a plurality of water absorption holes 1001, through which the squeezed water can be discharged.

[0054] Specifically, the suction pump 1003 can extract the water squeezed out of the squeeze tube 100 through the suction hole 1001 via the suction pipe 1002. The output end of the suction pump 1003 is connected to the interior of the storage box 61, so that the suction pump 1003 can inject the extracted water into the storage box 61 for collection. This ensures that the first and second absorbent sponge layers 81, 91 always have good water absorption properties, thereby efficiently absorbing water from the surface of the silicon wafer.

[0055] The interior of the machine 60 is sequentially mounted with a heating box 20, an air return box 40, and a fan 70. The input end of the fan 70 is connected to the interior of the air return box 40, and the output end of the fan 70 is connected to the interior of the heating box 20. An electric heating tube or heating wire is fixedly mounted inside the heating box 20 to continuously heat the air and generate dry hot air.

[0056] like Figure 1-Figure 3 As shown, the upper and lower ends of the drying ramp 10 are respectively fixedly installed with an upper blowing assembly and a lower blowing assembly, and the heating box 20 is fixedly installed with a main air inlet pipe 21. The upper and lower air blowing assemblies are both connected to the interior of the main air inlet pipe 21, and the drying hot air can be transmitted to the upper and lower air blowing assemblies respectively through the main air inlet pipe 21.

[0057] The upper air blowing assembly includes an upper air blowing hood 11, which is fixedly mounted on the top of the drying ramp 10. An upper air supply pipe 22 is fixedly mounted on the upper air blowing hood 11, one end of which is fixedly mounted on the main air inlet pipe 21. Dry hot air can be injected into the upper air blowing hood 11 through the upper air supply pipe 22. The upper end surface of the drying ramp 10 is provided with a plurality of upwardly inclined openings 104. The interior of the upper air blowing hood 11 is connected to the interior of the drying ramp 10 through the plurality of upwardly inclined openings 104. The dry hot air entering the upper air blowing hood 11 can be blown out through the plurality of upwardly inclined openings 104.

[0058] The lower air blowing assembly includes a lower air blowing hood 13, which is fixedly mounted at the bottom end of the drying ramp 10. A lower air supply pipe 24 is fixedly mounted on the lower air blowing hood 13. One end of the lower air supply pipe 24 is fixedly mounted on the main air inlet pipe 21, allowing hot drying air to be injected into the lower air blowing hood 13 through the lower air supply pipe 24. The lower end surface of the drying ramp 10 is provided with a plurality of downwardly inclined openings 101. The interior of the lower air blowing hood 13 is connected to the interior of the drying ramp 10 through the plurality of downwardly inclined openings 101. The hot drying air entering the lower air blowing hood 13 can be blown out through the plurality of downwardly inclined openings 101.

[0059] In addition, if Figure 3 As shown, several downwardly inclined openings 101 correspond to several upwardly inclined openings 104, ensuring uniform force on the silicon wafers. The blowing pressure of the downwardly inclined openings 101 is greater than that of the upwardly inclined openings 104. Specifically, let the blowing pressure of the downwardly inclined openings 101 be F and the blowing pressure of the upwardly inclined openings 104 be N. The gravity acting on the silicon wafer can be decomposed into a force perpendicular to the drying ramp 10 and a force parallel to the drying ramp 10. The force perpendicular to the drying ramp 10 is G1, and the force parallel to the drying ramp 10 is G2. Thus, F = N + G1. This ensures that the silicon wafers can float within the drying ramp 10. The silicon wafers can then automatically slide down using the force parallel to the drying ramp 10, allowing them to float and slide within the drying ramp 10. During the suspended sliding process, the surface of the silicon wafer is dried by drying hot air, so that the silicon wafer can be dried without contact, effectively avoiding the problem of dead corners in the silicon wafer that makes it difficult to dry it thoroughly, greatly improving the drying efficiency of the silicon wafer, shortening the time for silicon wafer texturing, and thus improving the production efficiency of BC batteries.

[0060] Preferably, Figure 6 As shown, a first flow valve 25 is fixedly installed on the upper air supply pipeline 22 and the lower air supply pipeline 24. The first flow valve 25 can adjust the flow of the drying hot air entering the upper air supply pipeline 22 and the lower air supply pipeline 24, so as to regulate the blowing pressure of the lower inclined opening 101 and the upper inclined opening 104, ensuring that different silicon wafers can float and slide inside the drying ramp 10, thereby enhancing adaptability.

[0061] like Figure 1 and Figure 5 As shown, a liquid storage tank 30 is fixedly mounted on the machine platform 60. A liquid boron source is stored in the liquid storage tank 30. A boron source spraying mechanism is mounted on both the upper air blowing hood 11 and the lower air blowing hood 13. The boron source spraying mechanism includes multiple sets of upper atomizing nozzles 111 and multiple sets of lower atomizing nozzles 131. The multiple sets of upper atomizing nozzles 111 are fixedly mounted near the middle of the upper air blowing hood 11, and the multiple sets of lower atomizing nozzles 131 are fixedly mounted near the middle of the lower air blowing hood 13. The multiple sets of upper atomizing nozzles 111 and the multiple sets of lower atomizing nozzles 131 are arranged in a straight line.

[0062] A liquid pump 31 is fixedly mounted on the liquid storage tank 30. The output end of the liquid pump 31 is inserted into the interior of the liquid storage tank 30, and the liquid pump 31 can extract the liquid boron source from the interior of the liquid storage tank 30. A main liquid inlet pipe 32 is fixedly mounted on the output end of the liquid pump 31. A lower liquid supply line 33 and an upper liquid supply line 34 are connected in parallel to the main liquid inlet pipe 32. A second flow valve 35 is fixedly mounted on each of the lower liquid supply line 33 and the upper liquid supply line 34. The supply amount of the liquid boron source can be controlled by the second flow valve 35. The lower liquid supply line 33 is matched with multiple groups of lower atomizing nozzles 131, and the liquid boron source can be supplied to multiple groups of lower atomizing nozzles 131 simultaneously through the lower liquid supply line 33; the upper liquid supply line 34 is matched with multiple groups of upper atomizing nozzles 111, and the liquid boron source can be supplied to multiple groups of upper atomizing nozzles 111 simultaneously through the upper liquid supply line 34.

[0063] The upper gas supply pipeline 22 and the lower gas supply pipeline 24 are both fixedly installed with a bronchial pipe 23. The gas inside the upper gas supply pipeline 22 and the lower gas supply pipeline 24 can respectively enter the inside of the bronchial pipe 23 connected thereto. The bronchial pipe 23 on the upper gas supply pipeline 22 matches the multiple groups of upper atomizing nozzles 111 and can simultaneously supply gas to the multiple groups of upper atomizing nozzles 111, so that the liquid boron source can be atomized and sprayed to the upper surface of the silicon wafer through the multiple groups of upper atomizing nozzles 111. The bronchial pipe 23 on the lower gas supply pipeline 24 matches the multiple groups of lower atomizing nozzles 131 and can simultaneously supply gas to the multiple groups of lower atomizing nozzles 131, so that the liquid boron source can be atomized and sprayed to the lower surface of the silicon wafer through the multiple groups of lower atomizing nozzles 131.

[0064] Specifically, since the boron diffusion process is carried out immediately after the silicon wafer is polished and dried, the boron diffusion process requires coating the boron source on the surface of the silicon wafer and drying it. However, it is relatively difficult to coat the boron source on the entire surface of the silicon wafer without any dead angles, and it is very time-consuming. This is also one of the factors that hinder the efficient production of BC batteries. With the help of drying hot air, the liquid boron source can be atomized and sprayed onto the upper and lower surfaces of the suspended and sliding silicon wafer through multiple groups of upper atomizing nozzles 111 and multiple groups of lower atomizing nozzles 131, respectively, so that the boron source can be sprayed comprehensively. In addition, the upper atomizing nozzles 111 and the lower atomizing nozzles 131 are both located near the middle of the drying ramp 10. At this time, the silicon wafer is initially dried during the front suspension and sliding process. After the boron source is sprayed, the rear suspension and sliding can dry the boron source on the surface of the silicon wafer and further dry the silicon wafer, ensuring the drying effect of the silicon wafer. It is worth noting that the length of the drying ramp 10 can be adjusted according to actual needs to ensure the drying effect of the silicon wafer. This not only allows the silicon wafer to be quickly and completely dried after the texturing is completed, but also enables the boron source to be fully coated and dried, so that the silicon wafer after texturing can immediately enter the diffusion furnace for diffusion, greatly improving the continuity between processes while simplifying the production process, further improving the production efficiency of BC batteries and reducing production costs.

[0065] like Figure 1 and Figure 2 As shown, a wafer guide 50 is mounted on the end of the drying ramp 10 away from the storage box 61. This guide 50 is used to transport the dried silicon wafers backward. A lower flat opening 102 is provided on the lower end surface of the drying ramp 10, near the wafer guide 50. This opening 102 also allows for the blowing of hot drying air, but this time, air is blown upward only through this opening 102. The silicon wafers are subjected only to an upward force, causing them to transition from an inclined position to a horizontal position before sliding out of the drying ramp 10. This ensures that they can slide safely and smoothly onto the wafer guide 50 without being damaged, thus ensuring the yield rate and, therefore, the production quality of BC batteries.

[0066] like Figure 1 and Figure 4 As shown, return air components are fixedly installed on both side walls of the drying ramp 10, and the return air components include a pair of air collecting hoods 12, which are respectively fixedly installed on both side walls of the drying ramp 10. A number of air outlet holes 103 are opened on both side walls of the drying ramp 10, and the interior of the air collecting hood 12 is connected with the interior of the drying ramp 10 through the number of air outlet holes 103. Return air pipes 121 are fixedly installed between the pair of air collecting hoods 12 and the return air box 40. The drying exhaust gas can be drawn into the interior of the air collecting hood 12 through the number of air outlet holes 103, and then enter the interior of the return air box 40 through the return air pipes 121.

[0067] A pair of gas-liquid separators 41 are fixedly mounted inside the return air box 40. These gas-liquid separators 41 can be spiral-type. One end of a pair of return air pipes 121 extends through the interior of the return air box 40 and communicates with the interior of the gas-liquid separators 41. This allows the drying exhaust gas to enter the gas-liquid separators 41 through the return air pipes 121, where water is separated. A water collection box 42 is fixedly mounted at the bottom of the gas-liquid separator 41 to collect the separated water, thereby ensuring that the drying exhaust gas remains dry. An air extraction port is provided near the bottom of the gas-liquid separator 41, through which the dried drying exhaust gas enters the return air box 40.

[0068] In addition, the return air box 40 is fixedly installed with a pair of filters 43, and the pair of filters 43 are respectively located on one side of a pair of gas-liquid separators 41. The dried exhaust gas can be filtered and purified through the filter 43 to obtain high-temperature clean gas. The high-temperature clean gas is sent into the heating box 20 again through the fan 70, so that the drying exhaust gas can be recycled, the heat energy can be fully utilized, energy saving and environmental protection are conducive to improving the drying effect.

[0069] A BC battery production process comprises the following steps:

[0070] S1. After the texturing is completed, the flower basket is taken from the pure water tank at the end of the texturing equipment and placed on the supporting mesh plate 611 to control the water;

[0071] S2. Silicon wafers are sequentially picked up from the basket and placed on the second absorbent sponge layer 91. The silicon wafers are then conveyed onto the second absorbent sponge layer 91 and into the drying ramp 10. The first absorbent sponge layer 81 and the second absorbent sponge layer 91 absorb water from the upper and lower surfaces of the silicon wafers, respectively, to initially remove most of the water from the silicon wafer surfaces.

[0072] S3, by blowing air up and down to suspend the silicon wafer inside the drying ramp 10, and use the silicon wafer's own gravity to make it move diagonally downward, achieving non-contact preliminary drying of the silicon wafer surface during the movement;

[0073] S4. When the silicon wafer moves through the upper atomizing nozzle 111 and the lower atomizing nozzle 131, a boron source is sprayed on its surface, and then the silicon wafer continues to move for drying. After drying, it uses inertia to move to the wafer guide 50 and is transferred to the next process.

[0074] Compared with the existing technology, the present invention can directly take the silicon wafer out of the flower basket after pure water cleaning, remove most of the water by dipping and sucking the surface of the silicon wafer, and then automatically perform contactless transmission and drying on the silicon wafer, so that the silicon wafer can be dried quickly and efficiently without dead angles, greatly shortening the silicon wafer texturing process time and improving the production efficiency of BC batteries; during the contactless transmission and drying process, the boron source can also be fully coated on the silicon wafer surface and dried simultaneously, so as to directly proceed to the next step of boron diffusion process, increase the continuity between processes, and further improve production efficiency.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0076] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A BC battery production equipment, characterized in that, include: A machine platform, wherein a placement box is fixedly installed on the machine platform, a heating box, a return air box and a fan are sequentially installed inside the machine platform, the input end of the fan is connected to the inside of the return air box, and the output end of the fan is connected to the inside of the heating box; A drying ramp is provided above the machine in an inclined shape, an upper transmission belt and a lower transmission belt are installed at one end of the drying ramp close to the machine, and one end of the lower transmission belt extends to the outside of the drying ramp; a first absorption sponge layer is fixedly installed on the upper transmission belt, and a second absorption sponge layer is fixedly installed on the lower transmission belt, the first absorption sponge layer and the second absorption sponge layer can absorb water from the upper and lower surfaces of the silicon wafer respectively, and a water squeezing and collecting mechanism is installed on the drying ramp, and the water squeezing and collecting mechanism is used to remove water absorbed by the first absorption sponge layer and the second absorption sponge layer; An upper air blowing assembly and a lower air blowing assembly are fixedly mounted on the upper and lower ends of the drying ramp, respectively. A main air inlet pipe is fixedly mounted on the heating box. Both the upper air blowing assembly and the lower air blowing assembly are connected to the interior of the main air inlet pipe. The air blowing pressure of the upper air blowing assembly is lower than that of the lower air blowing assembly. A liquid storage tank, the liquid storage tank is fixedly mounted on the machine platform, the liquid storage tank stores a liquid boron source, and the upper air blowing assembly and the lower air blowing assembly are both equipped with a boron source spraying mechanism; Air return components are fixedly installed on both side walls of the drying ramp, and the air return components are connected to the interior of the air return box.

2. A BC battery production equipment according to claim 1, characterized in that: The upper air blowing assembly includes an upper air blowing hood, which is fixedly mounted on the top of the drying ramp. The upper end surface of the drying ramp is provided with a plurality of upward inclined openings. The interior of the upper air blowing hood is connected to the interior of the drying ramp through the plurality of upward inclined openings. An upper air supply pipeline is fixedly mounted on the upper air blowing hood, and one end of the upper air supply pipeline is fixedly mounted on the main air inlet pipe. The lower air blowing assembly includes a lower air blowing hood, which is fixedly mounted on the bottom end of the drying ramp. The lower end surface of the drying ramp is provided with a plurality of downwardly inclined openings. The interior of the lower air blowing hood is connected to the interior of the drying ramp through the plurality of downwardly inclined openings. A lower air supply pipeline is fixedly mounted on the lower air blowing hood, and one end of the lower air supply pipeline is fixedly mounted on the main air inlet pipe. A plurality of the downwardly inclined openings match a plurality of the upwardly inclined openings; A first flow valve is fixedly installed on both the upper air supply pipeline and the lower air supply pipeline.

3. A BC battery production equipment according to claim 2, characterized in that: A sheet guide is installed at one end of the drying ramp away from the placement box, and a lower flat opening is provided on the lower end surface of the drying ramp close to the sheet guide.

4. A BC battery production equipment according to claim 2, characterized in that: The return air assembly includes a pair of air collecting hoods, which are fixedly installed on both side walls of the drying ramp. A number of air outlet holes are provided on both side walls of the drying ramp. The interior of the air collecting hood is connected to the interior of the drying ramp through the number of air outlet holes. A return air pipe is fixedly installed between the air collecting hood and the return air box.

5. A BC battery production equipment according to claim 4, characterized in that: A pair of gas-liquid separators are fixedly installed inside the return air box, one end of a pair of return air pipes passes through the interior of the return air box and is connected to the interior of the gas-liquid separator, an air extraction port is opened near the bottom of one side of the gas-liquid separator, and a water collecting box is fixedly installed at the bottom of the gas-liquid separator; The return air box is fixedly mounted with a pair of filter screens, which are respectively located on one side of a pair of gas-liquid separators.

6. A BC battery production equipment according to claim 2, characterized in that: The boron source spraying mechanism includes multiple groups of upper atomizing nozzles and multiple groups of lower atomizing nozzles, wherein the multiple groups of upper atomizing nozzles are fixedly installed near the middle of the upper air blowing hood, and the multiple groups of lower atomizing nozzles are fixedly installed near the middle of the lower air blowing hood; A liquid pump is fixedly mounted on the liquid storage tank, the output end of the liquid pump is inserted into the liquid storage tank, a main liquid inlet pipe is fixedly mounted on the output end of the liquid pump, a lower liquid supply pipeline and an upper liquid supply pipeline are connected in parallel to the main liquid inlet pipe, a second flow valve is fixedly mounted on both the lower liquid supply pipeline and the upper liquid supply pipeline, the lower liquid supply pipeline is matched with multiple groups of lower atomizing nozzles, and the upper liquid supply pipeline is matched with multiple groups of upper atomizing nozzles; The upper air supply pipeline and the lower air supply pipeline are both fixedly installed with bronchi. The bronchi on the upper air supply pipeline match multiple groups of upper atomizing nozzles, and the bronchi on the lower air supply pipeline match multiple groups of lower atomizing nozzles.

7. The BC battery production equipment according to claim 1, characterized in that: The squeezed water collection mechanism includes at least two groups of squeeze tubes, which are rotatably mounted inside the drying ramp and are in close contact with the outer surfaces of the upper transmission belt and the lower transmission belt, respectively.

8. The BC battery production equipment according to claim 7, characterized in that: A suction pump is fixedly installed on the placement box, a suction pipeline is fixedly installed on the input end of the suction pump, and at least two groups of the extrusion tubes are connected to the suction pipeline; A plurality of water absorption holes are provided on the surfaces of at least two groups of the extruded tubes.

9. The BC battery production equipment according to claim 8, characterized in that: A supporting mesh plate is fixedly installed at a position near the top of the placement box, and the output end of the suction pump is connected to the inside of the placement box.

10. A BC battery production process, using a BC battery production device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After the texturing is completed, grab the flower basket from the pure water tank at the end of the texturing equipment and place it on the supporting mesh plate to control the water; S2. Sequentially grab the silicon wafers from the basket and place them on the second absorbent sponge layer. The silicon wafers are then conveyed onto the second absorbent sponge layer into the drying ramp. The first and second absorbent sponge layers absorb water from the upper and lower surfaces of the silicon wafers, respectively, to initially remove most of the water from the silicon wafer surfaces. S3, by blowing air up and down, the silicon wafer is suspended inside the drying ramp, and the silicon wafer's own gravity is used to move it diagonally downward, achieving non-contact preliminary drying of the silicon wafer surface during the movement; S4. When the silicon wafer moves through the upper atomizing nozzle and the lower atomizing nozzle, the boron source is sprayed on its surface, and then it continues to move and dry. After drying, it uses inertia to move to the wafer guide and is transferred to the next process.

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