Solar cell wet process machine drying groove body
By introducing exhaust gas recovery, dust removal, and ozone monitoring devices into the drying tank, the problems of dirt and high ozone concentration in the drying tank of the machine were solved, achieving efficient and clean drying and improving the quality of battery cells.
Patent Information
- Application Number
- CN202520237071.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-14
AI Technical Summary
The existing texturing machine's drying tank is filled with dirt, which leads to cell contamination and oxidation, affecting cell efficiency. In addition, the unfiltered air results in high ozone concentrations.
Design a drying tank for a wet process of solar cells, including an exhaust gas recovery device, a dust removal device, and an ozone monitoring device, which removes dirt and controls ozone concentration by recycling air.
This improved drying efficiency, ensured the cleanliness of the silicon wafer surface, reduced blackening defects in the solar cells, and improved the quality of the solar cells.
Smart Images
Figure CN223580457U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to photovoltaic technical field, concretely relates to a solar cell piece wet method machine platform drying groove body. BACKGROUND
[0002] Heterojunction cell full name is crystalline silicon heterojunction solar cell, also called HIT, HJT, SHJ. Heterojunction cell piece has symmetric double-sided cell structure, and the middle is N type crystalline silicon. The front surface of the heterojunction cell piece is sequentially deposited intrinsic amorphous silicon film and P type amorphous silicon film, thereby forming P-N junction;The back surface of the heterojunction cell piece is sequentially deposited intrinsic amorphous silicon film and N type amorphous silicon film to form a back surface field. Since the conductivity of amorphous silicon is relatively poor, a transparent conductive film (TCO) is deposited on both sides of the cell for conduction, and finally a double-sided electrode is formed by screen printing technology.
[0003] In the preparation process of HJT cell piece, the cell piece needs to go through four processes: texturing cleaning→CVD coating→PVD coating→screen printing. Texturing is the first process of HJT cell piece preparation, which first needs silicon material to provide high-quality N type single crystal silicon wafer, then performs cleaning treatment, texturing, removes surface dirt, foreign matter, metal substances and mechanical damage layer on the N type single crystal silicon wafer, and finally prepares a clean silicon wafer. Due to the unique structure of heterojunction cell, the surface of the silicon wafer substrate in the HJT cell is directly part of the heterojunction interface, so a clean silicon wafer surface is needed to avoid the introduction of defects and impurities caused by impurities at the junction interface. Good texturing interface and clean silicon wafer surface make the silicon wafer after texturing have better matching with the next process of CVD coating, so the cleanliness of the silicon wafer surface and the uniformity and stability of the texturing structure are obviously higher than those of the conventional single crystal silicon solar cell piece.
[0004] The texturing machine drying groove in production has long-term accumulation of silicon powder, micro-particles generated by mechanical arm and machine wear and tear, and other dirt, which has not been effectively treated, resulting in a large amount of dirt and dust accumulated in the groove. With the high-temperature hot air of drying, the dirt and dust fall into the water tank before the drying groove, polluting the cell piece and causing the cell piece to be dirty. In addition, the machine does not effectively design the machine environment air and airflow, and the air without chemical filtration is introduced into the drying groove, resulting in high ozone concentration in the drying groove, causing the cell piece to be polluted and oxidized, the surface cleanliness is poor, the fog blackening isolation is seriously out of standard, and further affecting the efficiency of the cell piece. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model provides a solar cell piece wet method machine platform drying groove body to solve the problem of improving drying efficiency, solve the problem of recycling the tail gas in the drying groove, and further solve the problem of stable cleanliness in the drying groove.
[0006] The solar cell piece wet method machine platform drying groove body provided by the utility model successively comprises a wind supply pipeline (1), a first cover plate (5), a first fan (6), a second cover plate (7) and a flower basket (8) filled with silicon pieces from bottom to top, the first cover plate (5) is provided with an air inlet (4) at the joint with the wind supply pipeline (1), the wind supply pipeline (1) is provided with a heating device (2) close to the air inlet (4), the first fan (6) is driven by a first motor (3), and the second cover plate (7) is provided with holes.
[0007] Further, the flower basket (8) is provided with heat preservation layers (9) on both sides.
[0008] Further, the wind supply pipeline (1) and the first cover plate (5) are further provided with a recovery pipeline (11), air enters the wind supply pipeline (1) through the air inlet (4), is heated by the heating device (2) and enters the inside of the drying groove body, and the recovery pipeline (11) is used for recovering the heated air tail gas.
[0009] Further, the drying groove body further comprises a dust removal device arranged on the side of the drying groove body, the dust removal device comprises a dust absorption pad (14) and a second fan (13), and the second fan (13) is driven by a second motor (12).
[0010] Preferably, the dust absorption pad (14) is a drawable high-temperature-resistant dust absorption pad.
[0011] Further, the upper portion of the drying groove body is provided with a groove cover (10).
[0012] Further, the drying groove body further comprises an ozone monitoring device (15) arranged in the drying groove body and used for monitoring the ozone concentration level in the drying groove.
[0013] Further, the ozone monitoring device (15) comprises a monitoring pipeline and a display, the monitoring pipeline leads into the drying groove body, and the display is installed on the groove cover (10).
[0014] Further, the drying groove body is a cuboid structure.
[0015] The utility model has the advantages of:
[0016] (1) the utility model discloses a tail gas recovery device, and the drying efficiency is improved and the cost is saved by using the recycling mode.
[0017] (2) the utility model discloses a dust removal device, which effectively removes dirt in the drying groove, ensures the stability of the cleanliness in the groove and improves the surface quality of the silicon piece.
[0018] (3)The utility model discloses a increase ozone monitoring device, guarantee the concentration of ozone in drying groove standard, thereby make the battery piece blackening bad greatly reduce. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 A drying groove body schematic view is provided for the utility model embodiment;
[0020] Figure 2 Another drying groove body schematic view is provided for the utility model embodiment.
[0021] The meaning of each reference numeral in the drawing is as follows:
[0022] 1, air supply pipeline;2, heating device;3, first motor;4, air inlet;5, first cover plate;6, first fan;7, second cover plate;8, flower basket;9, heat preservation interlayer;10, groove cover;11, recovery pipeline;12, second motor;13, second fan;14, dust pad;15, ozone monitoring device. DETAILED DESCRIPTION
[0023] In order to facilitate understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the utility model are given in the drawings. However, the utility model can be realized 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 utility model more thorough and comprehensive.
[0024] It should be noted that when an element is referred to as "mounted on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.
[0026] Embodiment one:
[0027] Please refer to Figure 1 The solar cell wafer wet process machine drying groove body provided by the utility model embodiment one includes air supply pipeline 1, first cover plate 5, first fan 6, second cover plate 7 and flower basket 8 filled with silicon wafer from bottom to top. The drying groove body is a cuboid structure, and the black outline in the drawing is the groove body shell. The upper part of the drying groove body is provided with groove cover 10.
[0028] An air inlet 4 is provided at the connection between the first cover plate 5 and the air supply pipe 1, and there are two air inlets shown in the figure. Insulation layers 9 are provided on both sides of the flower basket 8.
[0029] A heating device 2 is installed near the air inlet 4 in the air supply duct 1. The heating device provides heat through internal heating wires to heat the air. Driven by the first motor 3, the first fan 6 draws in heated fresh air into the drying chamber to dry the flower basket 8 and silicon wafers inside. The second cover plate 7 has holes to facilitate the even entry of hot air into the drying chamber and to support the flower basket 8.
[0030] Example 2:
[0031] Compared with Embodiment 1, Embodiment 2 also includes an exhaust gas recovery device.
[0032] The exhaust gas recovery device is used for the recycling of exhaust gas and mainly includes a recovery pipeline 11.
[0033] Please see Figure 2 The solar cell wet drying tank provided in Embodiment 2 of this utility model, based on Embodiment 1, further includes a recovery pipe 11 between the air supply pipe 1 and the first cover plate 5. Air enters the air supply pipe 1 through the air inlet 4, is heated by the heating device 2, and then enters the drying tank. The recovery pipe 11 is used to recover the heated exhaust gas.
[0034] The air source for air inlet 4 is selected from air that has been chemically filtered (FFU) in a Class 1000 area. It is introduced into the drying tank through heating pipes, and the heated exhaust air is recovered and reheated. The temperature of the drying tank is precisely controlled based on the temperature measurement data and heat loss in the drying tank.
[0035] Example 3:
[0036] Compared with Embodiment 1, Embodiment 3 also includes an exhaust gas recovery device and a dust removal device.
[0037] The dust removal device is used to clean the dirt inside the drying tank.
[0038] Please see Figure 2 The solar cell wet processing machine drying tank provided in Embodiment 3 of this utility model, based on Embodiment 2, further includes a dust removal device disposed on the side of the drying tank. The dust removal device includes a dust-adhesive pad 14 and a second fan 13, which is driven by a second motor 12.
[0039] The dust catching pad preferably uses a high-temperature-resistant dust catching pad that can be extracted. Two high-temperature-resistant dust catching pads and two second fans are installed at side positions in the drying tank body, one dust catching pad and one second fan are installed at each side of the drying tank, dust and dirt remaining in the tank are blown to the dust catching pad 14 by the second fan 13, and large particles generated by daily production and mechanical wear are effectively removed. The dust catching pad is designed to be extractable, facilitating daily replacement. A plurality of dust catching pads have a certain space on the side of the tank, the dust catching pads are connected to sliding rails on both sides, the sliding rails are fixed to the drying tank body, and when replacement is needed, the dust catching pads are extracted, a dust catching pad on the surface is torn off, and then inserted back into the tank. The process temperature of the drying tank body is set to 80 DEG C, and the dust catching pad can resist a temperature of 150 DEG C.
[0040] Example four:
[0041] Compared with example one, example four further comprises a tail gas recovery device, a dust removal device and an ozone monitoring device.
[0042] Please refer to Figure 2 The solar cell wafer wet process machine drying tank body provided by the embodiment four of the utility model, on the basis of example three, the drying tank body further includes an ozone monitoring device 15 arranged in the drying tank body, which is used for monitoring the ozone concentration level in the drying tank, controlling the ozone concentration to be less than or equal to 8 ppb, and preventing the silicon wafer from oxidizing and blackening.
[0043] The ozone monitoring device 15 includes a monitoring pipeline and a display, the monitoring pipeline is connected to the drying tank, effectively monitoring the ozone concentration in the drying tank, and the display is installed on the tank cover 10, facilitating observation and recording by workers.
[0044] After the air filtered by the chemical filter (FFU) is heated by the heating device, the first motor 3 drives the first fan 6 to work, and the heated fresh air is introduced into the drying tank to dry the flower basket 8 and the silicon wafer in the flower basket. The dust removal device drives the second fan 13 to work by the second motor 12, blows the dust and dirt remaining in the drying tank to the dust catching pad 14, effectively removes the silicon powder generated by daily production and large particles generated by mechanical wear in the drying tank, and the ozone monitoring device 15 monitors the ozone in the drying tank at any time, ensuring that the ozone concentration is stable.
[0045] The technical features of the above examples can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above examples are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.
[0046] The above embodiment only expresses the preferred implementation of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A drying tank for a wet processing machine for solar cells, characterized in that: From bottom to top, it includes an air supply pipe (1), a first cover plate (5), a first fan (6), a second cover plate (7), and a basket (8) filled with silicon wafers. The first cover plate (5) is provided with an air inlet (4) at the connection between it and the air supply pipe (1). The air supply pipe (1) is provided with a heating device (2) near the air inlet (4). The first fan (6) is driven by a first motor (3). The second cover plate (7) is provided with holes.
2. The drying tank of the solar cell wet processing machine according to claim 1, characterized in that: The flower basket (8) is provided with heat-insulating layers (9) on both sides.
3. The drying tank of the solar cell wet processing machine according to claim 1, characterized in that: A recovery pipe (11) is also provided between the air supply pipe (1) and the first cover plate (5). Air enters the air supply pipe (1) through the air inlet (4), is heated by the heating device (2), and enters the drying tank. The recovery pipe (11) is used to recover the heated air exhaust.
4. The drying tank of the solar cell wet processing machine according to claim 1, characterized in that: The drying tank also includes a dust removal device disposed on its side, the dust removal device including a dust-adhesive pad (14) and a second fan (13), the second fan (13) being driven by a second motor (12).
5. The drying tank of the solar cell wet processing machine according to claim 4, characterized in that: The dust pad (14) is a removable high-temperature resistant dust pad.
6. The drying tank of the solar cell wet processing machine according to claim 1, characterized in that: The drying tank is provided with a tank cover (10) on top.
7. The drying tank of the solar cell wet processing machine according to claim 6, characterized in that: The drying tank also includes an ozone monitoring device (15) installed therein for monitoring the ozone concentration level in the drying tank.
8. The drying tank of the solar cell wet processing machine according to claim 7, characterized in that: The ozone monitoring device (15) includes a monitoring pipeline and a display. The monitoring pipeline is inserted into the drying tank, and the display is mounted on the tank cover (10).
9. The drying tank of the solar cell wet processing machine according to claim 1, characterized in that: The drying tank has a rectangular parallelepiped structure.