Texturing auxiliary device of solar cell

Abstract

The utility model provides a texturing auxiliary device of a solar cell, comprising a texturing groove in which corrosive liquid required by texturing is placed; the sliding rails are arranged on two sides of the texturing groove and are connected with the lifting bracket in a sliding manner; the top of the lifting bracket at the bottom of the same sliding rail is connected with a supporting plate; the two ends of the transverse moving frame are detachably connected with the supporting plates; the two sides of the material combing plate are connected with the transverse moving frame in a sliding mode, and row comb teeth are arranged at the bottom of the material combing plate at intervals. And the consistency of the textured surface on the surface of the silicon wafer is poor.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of solar cell production, and in particular to a texturing auxiliary device for solar cell cells. Background Art

[0002] Texturing is an important process in the production of solar cells. It aims to form a velvet structure with light-trapping function on the surface of silicon wafers through chemical or physical methods, thereby improving the light-trapping function and light absorption rate of silicon wafers.

[0003] The main purposes of texturing include: ‌Removing the mechanical damage layer: ‌ Mainly from the surface damage during the cutting process of the original wafer. ‌Increasing the surface area of ​​the cell: ‌Prepare for increasing the junction area for diffusion. ‌Light trapping principle: ‌Greatly reduce the surface reflectivity of the cell. ‌Removing impurities: ‌Removing oil stains on the surface of the cell by HF, ‌Removing metal impurities by HCL. ‌

[0004] According to the different crystal structures, polycrystalline is usually textured with acid, while single crystal is usually textured with alkali. The textured surface of polycrystalline is irregular, while the textured surface of single crystal is a regular pyramid structure. This structure is conducive to the use of the inclined surface of the light incident on the surface of the battery cell to form multiple reflections, which not only prolongs the light path, but also increases the absorption of infrared photons. At the same time, more photons generate photogenerated carriers near the PN junction, thereby increasing the collection of photogenerated carriers and improving the photoelectric conversion efficiency.

[0005] The inventor discovered the following defects during the operation of the specific embodiment:

[0006] During the texturing process, when the basket carrying the silicon wafers enters the texturing tank, due to the surface tension of the liquid, the corrosive liquid may find it difficult to enter the adjacent silicon wafers, especially the center of the silicon wafer, resulting in poor consistency of the texture on the surface of the silicon wafer, which is not conducive to ensuring the film color consistency of the subsequent coating process and the passivation effect of the silicon wafer in the subsequent passivation process, which in turn leads to poor electrical performance of the silicon wafer.

[0007] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Utility Model Content

[0008] 1. Technical problems to be solved by the utility model:

[0009] The utility model provides a texturing auxiliary device for solar cell sheets, which is used to solve the technical problems existing in the above-mentioned background technology.

[0010] 2. Technical solution:

[0011] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is: a solar cell sheet texturing auxiliary device, comprising:

[0012] The texturing tank contains the corrosive liquid required for texturing;

[0013] Sliding rails are arranged on both sides of the texturing groove and are slidably connected to the lifting bracket;

[0014] A lifting bracket, the top of which is connected to the support plate at the bottom of the sliding track;

[0015] A transverse moving frame, both ends of which are detachably connected to the support plate;

[0016] The combing plate is slidably connected to the transverse moving frame on both sides, and rows of comb teeth are arranged at intervals at the bottom.

[0017] When the device is working, the etching liquid required for texturing is poured into the texturing tank, and then the basket with installed silicon wafers is placed in the texturing tank, and the lifting bracket is moved to the top of the basket through the sliding track. The lifting bracket descends to drive the combing plate to descend, and the comb teeth at the bottom are respectively inserted into the gaps of the silicon wafers. Then the comb teeth move back and forth horizontally in the gaps of the silicon wafers, so that the internal etching liquid can be in good contact with the gaps between the battery cells, and the etching can smoothly flow into the gaps between the adjacent silicon wafers to reach the center of the silicon wafer. Therefore, the consistency of the velvet surface on the silicon wafer surface is improved, which ensures the consistency of the film color in the subsequent coating process and the passivation effect of the silicon wafer in the subsequent passivation process, thereby improving the electrical performance of the silicon wafer.

[0018] Furthermore, a concave insertion groove is provided at the bottom of the texturing groove, and the concave insertion groove is engaged with the flower basket.

[0019] Furthermore, a first rotating screw is provided at the top of the sliding track, the first rotating screw is matched and connected to a sliding block, and the top of the sliding block is connected to the lifting bracket.

[0020] Furthermore, a telescopic cylinder is provided on one side of the sliding track, a telescopic shaft of the telescopic cylinder is connected to a moving slider, and a top of the moving slider is connected to the lifting bracket.

[0021] Furthermore, the lifting bracket adopts a hydraulic lifting column.

[0022] Furthermore, connecting blocks are provided at both ends of the transverse moving frame, and the connecting blocks are detachably connected to the support plate. A first sliding groove is opened on the inner side of the transverse moving frame, and a second sliding groove is provided in the first sliding groove. The first sliding groove and the second sliding groove are slidably connected to the combing plate, and a driving device is provided at one end of the outer side of the second sliding groove, and the driving device is connected to the second rotating screw rod, and the second rotating screw rod is matched and connected to the combing plate.

[0023] Furthermore, the combing plate includes a convex slider, the top of which is slidably connected to the transverse moving frame, and the bottom of which is spaced apart and connected to the rows of comb teeth.

[0024] 3. Beneficial effects:

[0025] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0026] The utility model has a reasonable design. By utilizing the reciprocatingly movable comb teeth inserted into the gaps between the silicon wafers, the etching liquid can smoothly flow into the gaps between the adjacent silicon wafers to reach the center of the silicon wafer. Therefore, the velvet consistency of the silicon wafer surface is improved, thereby ensuring the film color consistency of the subsequent coating process and the passivation effect of the silicon wafer in the subsequent passivation process, thereby improving the electrical performance of the silicon wafer.

[0027] It should be noted that the structures not introduced in the present invention are not related to the design points and improvement directions of the present invention, and are the same as the prior art or can be implemented by using the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the velvet making tank of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the transverse movable frame of the utility model.

[0031] Reference numerals:

[0032] 1. Velveting groove; 11. Concave insertion groove; 2. Sliding track; 21. First rotating screw; 22. Sliding block; 3. Lifting bracket; 4. Support plate; 5. Lateral moving frame; 51. Connecting block; 52. First slide groove; 53. Second slide groove; 54. Driving device; 55. Second rotating screw; 6. Combing plate; 61. Convex slider; 7. Row of comb teeth. DETAILED DESCRIPTION

[0033] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0037] Refer to the attached Figure 1-3 , solar cell texturing auxiliary device, including

[0038] Texturing tank 1, in which the corrosive liquid required for texturing is placed;

[0039] Sliding rails 2 are arranged on both sides of the texturing tank 1 and are slidably connected to the lifting bracket 3;

[0040] A lifting bracket 3, the top of which is connected to a support plate 4 at the bottom of the sliding track 2;

[0041] A transverse moving frame 5, both ends of which are detachably connected to the supporting plate 4;

[0042] The combing plate 6 is slidably connected to the transverse moving frame 5 on both sides, and rows of comb teeth 7 are arranged at intervals at the bottom.

[0043] When the device is working, the etching liquid required for texturing is poured into the texturing tank 1, and then the flower basket with installed silicon wafers is placed in the texturing tank 1, and the lifting bracket 3 is moved to the top of the flower basket through the sliding track 2. The lifting bracket 3 descends to drive the combing plate 6 to descend, and the comb teeth 7 at the bottom are respectively inserted into the gaps of the silicon wafers. Then the comb teeth 7 move back and forth horizontally in the gaps of the silicon wafers, so that the internal etching liquid can be in good contact with the gaps between the battery cells, and the etching can smoothly flow into the gaps between the adjacent silicon wafers to reach the center of the silicon wafer. Therefore, the consistency of the velvet surface on the silicon wafer surface is improved, which ensures the consistency of the film color in the subsequent coating process and the passivation effect of the silicon wafer in the subsequent passivation process, thereby improving the electrical performance of the silicon wafer.

[0044] A concave insertion groove 11 is provided at the bottom of the texturing groove 1, and the concave insertion groove 11 is clamped with the flower basket. In order to facilitate the insertion of the comb teeth 7 into the gap of the silicon wafer at a specified position, the concave insertion groove 11 is set at a preset position to clamp with the bottom of the flower basket, which is convenient for subsequent automated operations and prevents the comb teeth 7 from shaking during operation, resulting in poor effect.

[0045] A first rotating screw rod 21 is provided on the top of the sliding track 2, and the first rotating screw rod 21 is matched and connected to the sliding block 22. The top of the sliding block 22 is connected to the lifting bracket 3. When working, the lifting bracket 3 can be manually moved to the two sides of the texturing groove 1 through the sliding track 2. However, in order to better ensure that the row of comb teeth 7 can be accurately inserted into the gap between the silicon wafers without hitting the silicon wafers, this embodiment adopts the first rotating screw rod 21 to rotate and then drive the sliding block 22 to move. After moving to the preset position, the lifting bracket 3 descends to perform combing operation.

[0046] A telescopic cylinder is provided on one side of the sliding track 2, the telescopic shaft of the telescopic cylinder is connected to the moving slider, and the top of the moving slider is connected to the lifting bracket 3. This embodiment uses a telescopic cylinder to move the position of the lifting bracket 3, which can well control the position of the lifting bracket 3.

[0047] The lifting bracket 3 adopts a hydraulic lifting column, which can well realize the lifting function and facilitate the up and down movement of the comb teeth 7.

[0048] The two ends of the transverse moving frame 5 are provided with connecting blocks 51, and the connecting blocks 51 are detachably connected to the supporting plate 4. A first sliding groove 52 is opened on the inner side of the transverse moving frame 5, and a second sliding groove 53 is arranged in the first sliding groove 52. The first sliding groove 52 and the second sliding groove 53 are slidably connected to the combing plate 6. A driving device 54 is arranged at one end of the outer side of the second sliding groove 53. The driving device 54 is connected to the second rotating screw rod 55, and the second rotating screw rod 55 is matched and connected to the combing plate 6. The combing plate 6 can reciprocate on the transverse moving frame 5, thereby realizing the combing operation of the bottom silicon wafer. During operation, when the lifting bracket 3 inserts the bottom combing teeth into the silicon wafer gap, the side driving device 54 will drive the second rotating screw rod 55 to rotate, and then drive the combing plate 6 to reciprocate on the transverse moving frame 5. It should be noted that the middle combing plate 6 can be set more than the number of the bottom flower baskets, thereby improving the working efficiency. The driving device 54 can be set on one side or on both sides according to the situation.

[0049] The combing plate 6 includes a convex slider 61, the top of which is slidably connected to the transverse moving frame 5, and the bottom of which is spaced apart and connected to the row of comb teeth 7. The convex slider 61 can slide back and forth on the transverse moving frame 5 to cooperate with the movement of the row of comb teeth 7 at the bottom.

[0050] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.

Claims

1. A solar cell texturing auxiliary device, characterized in that: include A texturing tank (1), in which a corrosive liquid required for texturing is placed; Sliding rails (2) are arranged on both sides of the texturing groove (1) and are slidably connected to the lifting bracket (3); A lifting bracket (3), the top of the lifting bracket (3) at the bottom of the same sliding track (2) is connected to the support plate (4); A transverse movable frame (5), wherein both ends of the transverse movable frame (5) are detachably connected to the support plate (4); The combing plate (6) is slidably connected to the transverse moving frame (5) on both sides, and rows of comb teeth (7) are arranged at intervals at the bottom.

2. The solar cell texturing auxiliary device according to claim 1, characterized in that: A concave insertion groove (11) is provided at the bottom of the velvet making groove (1), and the concave insertion groove (11) is engaged with the flower basket.

3. The solar cell texturing auxiliary device according to claim 1, characterized in that: A first rotating screw (21) is provided at the top of the sliding track (2), the first rotating screw (21) is matched and connected to a sliding block (22), and the top of the sliding block (22) is connected to the lifting bracket (3).

4. The solar cell texturing auxiliary device according to claim 1, characterized in that: A telescopic cylinder is provided on one side of the sliding track (2); a telescopic shaft of the telescopic cylinder is connected to a movable slide block; and a top of the movable slide block is connected to the lifting bracket (3).

5. The texturing auxiliary device for solar cell sheets according to claim 1, characterized in that: The lifting bracket (3) adopts a hydraulic lifting column.

6. The texturing auxiliary device for solar cell sheets according to claim 1, characterized in that: The two ends of the transverse moving frame (5) are provided with connecting blocks (51), and the connecting blocks (51) are detachably connected to the supporting plate (4). A first sliding groove (52) is provided on the inner side of the transverse moving frame (5), and a second sliding groove (53) is provided in the first sliding groove (52). The first sliding groove (52) and the second sliding groove (53) are slidably connected to the combing plate (6). A driving device (54) is provided at one end of the outer side of the second sliding groove (53), and the driving device (54) is connected to a second rotating screw rod (55), and the second rotating screw rod (55) is matched and connected to the combing plate (6).

7. The texturing auxiliary device for solar cell sheets according to claim 1, characterized in that: The combing plate (6) comprises a convex sliding block (61), the top of the convex sliding block (61) being slidably connected to the transverse moving frame (5), and the bottom of the convex sliding block (61) being spacedly connected to the rows of comb teeth (7).

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