Solar cell uniform texturing device

Abstract

The utility model provides a uniform texturing device for solar cells, which relates to the technical field of solar cell manufacturing devices and comprises a texturing pool, a rotating assembly, a rotating power assembly basket and a magnet. A through hole is formed in the bottom of the texturing pool, and the rotating assembly is arranged in the through hole and is in sliding fit with the bottom wall of the texturing pool in the circumferential direction of the through hole; the rotating power assembly is in transmission connection with the rotating assembly, magnets are arranged at the top end of the rotating assembly and / or the bottom end of the flower basket, and the rotating assembly is detachably connected with the flower basket through the magnets. The texturing device provided by the utility model achieves the technical effects of uniform texturing, short texturing reaction time, few impurities and high yield of silicon wafers in the flower basket through rotation.

Description

Solar cell uniform texturing device Technical Field

[0001] This utility model relates to the field of solar cell manufacturing equipment technology, and more specifically, to a solar cell uniform texturing device. Background Technology

[0002] In the production process of high-efficiency heterojunction solar cells, the silicon wafers first undergo texturing and cleaning. This step uses a trench texturing technique to ensure that the silicon wafer surface has better light absorption performance. Subsequently, the silicon wafers are coated using PECVD (plasma-enhanced chemical vapor deposition) to form the protective and functional layers of the cell, further enhancing its performance. Finally, the electrodes are fabricated using screen printing. Throughout the entire production process, the transfer of silicon wafers is crucial. This requires a special carrier—the basket—that can safely hold the silicon wafers in harsh environments with strong acids and alkalis, ensuring the smooth transfer of the wafers between different processes.

[0003] In existing texturing processes, silicon wafers are placed directly in a strong alkaline solution in a basket for static reaction. Initially, due to the high concentration of the alkaline solution, the reaction is rapid, and silicon atoms on the wafer surface are quickly removed. However, as the reaction progresses, the concentration of the alkaline solution decreases in some areas, slowing down the reaction rate. This uneven concentration distribution results in inconsistent texturing effects on the wafer surface; some areas are over-reacted, while others are under-reacted and contain more impurities. This uneven texturing effect directly affects the photoelectric conversion efficiency and yield of the battery. Summary of the Invention

[0004] The purpose of this invention is to provide a uniform texturing device for solar cells, so as to alleviate the technical problem in the prior art where silicon wafers are placed directly in a strong alkaline solution through a basket for static reaction, resulting in uneven texturing and a large number of impurities.

[0005] This invention provides a uniform texturing device for solar cells, comprising a texturing pool, a rotating assembly, a rotating power assembly, a flower basket, and a magnet; the bottom of the texturing pool has a through hole, the rotating assembly is disposed in the through hole and slides in cooperation with the bottom wall of the texturing pool along the circumference of the through hole; the rotating power assembly is connected to the rotating assembly in a transmission manner, and the top of the rotating assembly and / or the bottom of the flower basket are provided with a magnet, and the rotating assembly and the flower basket are detachably connected by the magnet;

[0006] Furthermore, the rotating assembly includes a rotating plate that rotates circumferentially along the through hole; a plurality of magnets are spaced apart on the top surface of the rotating plate; the rotating power assembly includes a first motor, the output shaft of the first motor is connected to a power gear, and the top of the power gear is fixedly connected to the rotating plate.

[0007] Furthermore, the rotating assembly includes a circular plate that rotates circumferentially along the through hole. The surface of the circular plate has a plurality of circular holes that are spaced apart circumferentially along the circular plate. Each circular hole contains a disk that rotates in conjunction with the circular plate along the circumferential direction of the hole. A magnet is provided at the top of the disk. The bottom of the disk is fixedly connected to the rotating power assembly.

[0008] Furthermore, the rotary power assembly includes a second motor, the output shaft of which is connected to a sun gear, and a number of evenly distributed planetary gears mesh around the outer periphery of the sun gear. The tops of the planetary gears are fixedly connected to the disk one by one, and gear rings mesh around the outer periphery of the multiple planetary gears.

[0009] Furthermore, the flower basket includes an upper mounting plate and a lower mounting plate arranged in parallel, and several evenly distributed connecting rods are fixed between the upper mounting plate and the lower mounting plate. Two connecting rods on any opposite face are fixed with corresponding fixing teeth on the same horizontal plane.

[0010] Furthermore, the connecting rod is covered with an anti-corrosion layer;

[0011] Furthermore, the fixed teeth are arc-shaped or triangular in shape;

[0012] Furthermore, the magnet is cross-shaped;

[0013] Furthermore, a fixed base is fixedly connected to the bottom of the flocking pool, and the fixed base is provided with an installation cavity, in which the rotational power component is arranged.

[0014] Furthermore, one side of the texturing pool is connected to an injection pipe, and the other side of the texturing pool is connected to an outlet pipe. Both the injection pipe and the outlet pipe are equipped with sealing rings at their connections to the texturing pool.

[0015] Beneficial effects:

[0016] This utility model provides a uniform texturing device for solar cells, comprising: a through hole at the bottom of a texturing pool, a rotating component disposed in the through hole and slidingly engaged with the bottom wall of the texturing pool along the circumference of the through hole, so that the rotating component can rotate relative to the bottom of the texturing pool; a rotating power component is connected to the rotating component for power transmission; a magnet is provided at the top of the rotating component and / or at the bottom of the basket, and the rotating component is detachably connected to the basket; and the magnet allows the basket to be placed vertically into the texturing pool, effectively increasing the number of baskets, thereby increasing the number of silicon wafers texturized in the same batch.

[0017] Each flower basket can be firmly attached to and rotated by a rotating component at the bottom of the magnetic rotating pool, thereby causing the silicon wafer to react, making texturing more thorough and faster. This invention can effectively reduce texturing reaction time and improve texturing yield. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the fabrication apparatus provided in an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the rotating power component in the flocking device provided in this embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the fabrication apparatus provided in another embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the rotating gear in the flocking device provided in the embodiment of this utility model;

[0023] Figure 5 is a schematic diagram of the structure of the flower basket in the velvet-making device provided in the embodiment of this utility model;

[0024] Figure 6 is a schematic diagram of a basket toothed structure in the velvet-making device provided in this embodiment of the present invention.

[0025] icon:

[0026] 100 - Texturing tank; 101 - Injection pipe; 102 - Outlet pipe;

[0027] 200 - Rotating assembly; 201 - Rotating plate; 202 - Circular plate; 203 - Circular disk;

[0028] 300 - Rotary power assembly; 301 - First motor; 302 - Rotating gear; 303 - Second motor; 304 - Sun gear; 305 - Planetary gear; 306 - Ring gear;

[0029] 400 - Flower basket; 401 - Upper mounting plate; 402 - Lower mounting plate; 403 - Connecting rod; 404 - Fixing tooth;

[0030] 500-Magnet;

[0031] 600-Fixed base. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0039] As shown in Figures 1 and 3, this embodiment provides a uniform texturing device for solar cells. The texturing pool 100 is configured as a cuboid, which allows for a more compact arrangement with subsequent equipment in a limited production environment.

[0040] The bottom of the pleating tank 100 is designed with through holes, and the rotating component 200 is placed in these through holes and can slide along the circumference of the through holes with the bottom wall of the pleating tank 100 to achieve the rotation function. Driven by the rotation power component 300, the rotating component 200 drives the flower basket 400 to rotate, which not only promotes the full progress of the pleating reaction, but also improves the pleating efficiency and reduces the time required for the pleating process.

[0041] The top of the rotating component 200 and the flower basket 400 are detachably connected by a magnet 500. There are three possible configurations: the first is to place the magnet 500 only at the top of the rotating component 200, and to place iron, cobalt, or other magnetically attractive material at the bottom of the flower basket 400; the second is to place the magnet 500 only at the bottom of the flower basket 400, and to place the rotating component 200 as a magnetically attractive material; the third, and optimal configuration, is to install magnets 500 at both the top of the rotating component 200 and the bottom of the flower basket 400, making the magnetic attraction between them more secure.

[0042] Furthermore, the magnetic connection provides a force transmission method without physical contact, allowing for rapid disconnection in case of abnormalities or when replacing the texturing basket 400. This reduces the contact between the silicon wafer and the texturing pool 100 when conventional silicon wafers are placed horizontally, thereby reducing maintenance needs and costs, and resulting in more uniform texturing. Moreover, placing several texturing baskets 400 vertically can effectively increase the number of silicon wafers that can be texturized in the same batch.

[0043] In one embodiment of the rotating assembly 200, the rotating assembly 200 includes a rotating plate 201 that rotates circumferentially along a through hole; a plurality of magnets 500 are spaced apart on the top surface of the rotating plate 201. As shown in Figures 3 and 4, the rotating power assembly 300 includes a first motor 301 and a rotating gear 302. The rotating gear 302 is connected to the rotating assembly 200 in a transmission manner. The first motor 301 drives the rotating gear 302 to rotate around its own axis. The rotating gear 302 further drives the rotating assembly 200 at the top to rotate. The rotating assembly 200 includes an integral rotating plate 201. The bottom end of the rotating plate 201 is fixed to the top end of the rotating gear 302 by a key or bolt, so that the rotating plate 201 can revolve with the drive of the rotating power assembly 300. A waterproof layer is also laid at the bottom of the texturing tank 100 to prevent the solution in the texturing tank 100 from leaking out from the rotating plate 201. Multiple magnets 500 are distributed on the top surface of the rotating plate 201. These magnets 500 are magnetically connected to the flower basket 400 through a waterproof layer, so that the flower basket 400 can also revolve accordingly with the revolution of the rotating plate 201, thus achieving a uniform flocking effect.

[0044] As another embodiment of the rotating component 200, as shown in Figures 1 and 2, the rotating component 200 includes a circular plate 202, which is embedded in a through hole and rotates circumferentially along the through hole. A waterproof layer is also laid at the bottom of the texturing tank 100 to prevent the solution in the texturing tank 100 from leaking out from the circular plate 202. Multiple circular holes are evenly distributed on the surface of the circular plate 202, and disks 203 that can drive the circular plate 202 to rotate are embedded in these holes. A magnet 500 is mounted at the top of each disk 203, and the magnet 500 is magnetically connected to the basket 400 through the waterproof layer.

[0045] The rotating power component 300 is installed at the bottom of the disc 203, enabling the disc 203 to rotate via a power transmission mechanism. This rotation simultaneously drives the disc 202 to rotate, achieving the revolution of the disc 203, thus forming a composite dynamic motion mode. This not only enhances the functionality of the rotating component 200 but also provides more efficient dynamic conditions for the flocking process.

[0046] The rotary power assembly 300 includes a second motor 303, whose output shaft is directly connected to the sun gear 304, ensuring efficient and direct power transmission from the motor to the planetary gear system. The sun gear 304 is located at the center of the planetary gear system, and its outer circumference meshes with several evenly distributed planetary gears 305. These planetary gears 305 not only interact with the sun gear 304, but each planetary gear 305's top surface is also connected to a disk 203 via a key or bolt, allowing the disk 203 to move as the planetary gear 305 rotates. The outer ring of each planetary gear 305 meshes with a ring gear 306, which surrounds the planetary gear system, providing a orbital path for the planetary gears. This allows the planetary gear 305 to rotate on its own axis while also revolving along the ring gear 306.

[0047] The planetary gear 305, the central sun gear 304, the ring gear 306, and the planet carrier supporting the gears form a shape similar to a planetary gear system, allowing the planetary gear 305 to rotate on its own axis while simultaneously revolving around the sun. At the same time, driven by the planetary gear 305, the disk 203 not only rotates on its own axis but also drives the circular plate 202 to move and revolve around the sun, achieving a dual rotation effect.

[0048] In a preferred embodiment of this invention, as shown in Figures 5 and 6, the flower basket 400 consists of an upper mounting plate 401 and a lower mounting plate 402 arranged in parallel. These two mounting plates can be designed as annular rings with a hollow structure in the middle to facilitate a more complete reaction between the silicon wafer and the solution. Between the upper mounting plate 401 and the lower mounting plate 402, 2 to 4 connecting rods 403 are evenly distributed and fixedly connected to provide necessary support. On any two opposing connecting rods 403, corresponding fixing teeth 404 are fixed on the same horizontal plane. These fixing teeth 404 are used to place the solar cell silicon wafer, ensuring that the silicon wafer can be stably fixed and react during the texturing process.

[0049] The connecting rod 403 is surrounded by an anti-corrosion layer. The connecting rod 403 is covered with polyvinylidene fluoride, polytetrafluoroethylene, or any material that does not affect the texturing reaction and provides corrosion protection. This anti-corrosion layer gives the basket 400 its corrosion resistance, resisting the erosion of strong acids, strong alkalis, and other chemicals. This ensures that the connecting rod 403 will not be corroded by harsh chemical environments even when used during silicon wafer texturing.

[0050] When the fixed teeth 404 have a triangular cross-section along the vertical direction, it not only achieves effective segmentation of silicon wafer placement, but also improves the quality of the textured surface, because the smaller contact area reduces the potential damage or uneven reaction on the silicon wafer surface.

[0051] It should be noted that when the fixed tooth 404 has an arc-shaped cross section along the vertical direction, it divides the air bubbles generated on the silicon wafer surface during the texturing process, preventing air bubbles from accumulating in local areas. This method of diverting air bubbles helps reduce defects when silicon wafers are stacked, while improving the uniformity and quality of the texturing surface; thus achieving the dual goals of improving texturing efficiency and improving texturing surface quality.

[0052] In a preferred embodiment of this invention, the magnet 500 is cross-shaped. This cross-shaped magnet design provides multiple contact points, increasing the stability of the magnetic connection and ensuring that the basket 400 does not shift or fall off during rotation. Simultaneously, it allows the basket 400 to be placed vertically into the texturing tank 100, effectively increasing the number of silicon wafers that can be texturized in the same batch.

[0053] A mounting base 600 is fixedly connected to the bottom end of the texturing tank 100. The mounting base 600 has an installation cavity, and the rotary power assembly 300 is arranged inside the installation cavity. This provides a good operating environment for the rotary power assembly 300 and allows the solution to flow into the rotary power assembly 300.

[0054] A liquid injection pipe 101 is connected to one side of the texturing tank 100 near the top for injecting necessary chemical solutions into the tank, and a liquid outlet pipe 102 is connected to the other side near the bottom for discharging used solutions. Sealing rings are provided at the connections of both the liquid injection pipe 101 and the liquid outlet pipe 102 to the texturing tank 100. This not only optimizes the flow management of the solution during the texturing process but also directly controls the injection and drainage of the pipelines, ensuring the continuity and efficiency of the texturing operation.

[0055] Based on the above embodiments, the texturing process of the solar cell uniformization device of this utility model is as follows:

[0056] Ensure the texturing tank 100 is clean and inspect all components, including the rotating assembly 200, the rotating power assembly 300, the basket 400, and the injection and discharge pipes 101 and 102, to ensure they are functioning properly. Inject an appropriate amount of chemical texturing solution into the texturing tank 100 through the injection pipe 101. The top position of the injection pipe 101 helps the solution to be evenly distributed in the texturing tank. Load the silicon wafer into the basket 400. The upper mounting plate 401 and lower mounting plate 402 of the basket 400 secure the silicon wafer via connecting rods 403 and fixing teeth 404. The design of the fixing teeth 404 helps to reduce the contact area between the silicon wafer and the fixing teeth 404, improving the texturing quality. Start the second motor 303. The planetary gear 305 on the rotating power assembly 300 meshes with the sun gear 304 and the ring gear 306, enabling the disk 203 to rotate and revolve. The magnet 500 on the disk 203 is magnetically connected to the basket 400, causing the silicon wafer inside the basket 400 to rotate and revolve, thus performing dynamic texturing. In addition, during the texturing process, solution is added through the injection pipe 101 or discharged through the outlet pipe 102 as needed to maintain the activity and cleanliness of the texturing solution.

[0057] After texturing is completed, the rotational power unit 300 is stopped. The used texturing solution is discharged through the outlet pipe 102. The silicon wafer is removed from the basket 400 and proceeds with subsequent work.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for uniform texturing of solar cells, characterized in that, include: The apparatus includes a pleating pool (100), a rotating assembly (200), a rotating power assembly (300), a flower basket (400), and a magnet (500). The bottom of the pleating pool (100) is provided with a through hole, and the rotating assembly (200) is disposed in the through hole and slides in cooperation with the bottom wall of the pleating pool (100) along the circumference of the through hole. The rotating power assembly (300) is connected to the rotating assembly (200) in a transmission manner. The top end of the rotating assembly (200) and / or the bottom end of the flower basket (400) are provided with a magnet (500). The rotating assembly (200) and the flower basket (400) are detachably connected through the magnet (500).

2. The solar cell uniform texturing apparatus according to claim 1, characterized in that, The rotating assembly (200) includes a rotating plate (201) that rotates circumferentially along the through hole; a plurality of magnets (500) are spaced apart on the top surface of the rotating plate (201); the rotating power assembly (300) includes a first motor (301), the output shaft of the first motor (301) is connected to a rotating gear (302), and the top end of the rotating gear (302) is fixedly connected to the rotating plate (201).

3. The solar cell uniform texturing apparatus according to claim 1, characterized in that, The rotating assembly (200) includes a circular plate (202) that rotates circumferentially along the through hole. The surface of the circular plate (202) is provided with a plurality of circular holes, which are spaced apart circumferentially along the circular plate (202). Each circular hole is provided with a disk (203), which rotates and engages with the circular plate (202) along the circumferential direction of the circular hole. The top end of the disk (203) is connected to the magnet (500), and the bottom end of the disk (203) is fixedly connected to the rotating power assembly (300).

4. The solar cell uniform texturing apparatus according to claim 3, characterized in that, The rotary power assembly (300) includes a second motor (303), the output shaft of which is connected to a sun gear (304). The outer periphery of the sun gear (304) is meshed with a plurality of evenly distributed planetary gears (305). The top of each planetary gear (305) is fixedly connected to the disk (203) in a one-to-one correspondence. The outer periphery of each planetary gear (305) is meshed with a gear ring (306).

5. The solar cell uniform texturing apparatus according to claim 1, characterized in that, The flower basket (400) includes an upper mounting plate (401) and a lower mounting plate (402) arranged in parallel. A plurality of evenly distributed connecting rods (403) are fixed between the upper mounting plate (401) and the lower mounting plate (402). Two connecting rods (403) on any opposite face are fixed with corresponding fixing teeth (404) on the same horizontal plane.

6. The solar cell uniform texturing apparatus according to claim 5, characterized in that, The connecting rod (403) is covered with an anti-corrosion layer.

7. The solar cell uniform texturing apparatus according to claim 5, characterized in that, The fixed tooth (404) is arc-shaped or triangular.

8. The solar cell uniform texturing apparatus according to claim 1, characterized in that, The magnet (500) is cross-shaped.

9. The solar cell uniform texturing apparatus according to claim 1, characterized in that, The bottom end of the flocking pool (100) is fixedly connected to a fixing seat (600), the fixing seat (600) is provided with an installation cavity, and the rotary power assembly (300) is arranged inside the installation cavity.

10. The solar cell uniform texturing apparatus according to claim 1, characterized in that, One side of the fabrication tank (100) is connected to an injection pipe (101), and the other side of the fabrication tank (100) is connected to an outlet pipe (102). Both the injection pipe (101) and the outlet pipe (102) are provided with sealing rings at their connection points with the fabrication tank (100).

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