Photovoltaic cell surface passivation line

Abstract

The utility model relates to the field of photovoltaic cells, in particular to a photovoltaic cell surface passivation line, which comprises a roller conveying mechanism, and an oil removal unit, a primary overflow washing unit, a detection unit, a passivation unit, a secondary overflow washing unit and a water drying unit which are sequentially arranged along the conveying direction of the roller conveying mechanism, the passivation unit comprises a first liquid medicine storage box, a first pump body connected with the first liquid medicine storage box and a plurality of first spray heads connected with the first pump body through pipelines, and the spraying water pressure of each first spray head is consistent. The deoiling unit, the primary overflow washing unit, the detection unit, the passivation unit, the secondary overflow washing unit and the blow-drying unit are sequentially arranged along the roller conveying mechanism, so that photovoltaic cell electroplating can be completed on one line, a passivation film is formed on the surface of a copper gate, the effect of protecting the surface of a copper gate line from being oxidized is achieved, and the service life of the copper gate line is prolonged. And a plurality of processes for passivating the surfaces of the photovoltaic cells are completed in a one-stop manner, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic cells, in particular to a surface passivation line for photovoltaic cell wafers. Background Art

[0002] During the process of manufacturing photovoltaic cell wafers, it is usually necessary to passivate the front or back surface of the photovoltaic cell wafers to form a passivation film, which can protect the surface of the copper grid lines from oxidation, thereby achieving the purpose of improving the overall performance of the photovoltaic cell wafers.

[0003] When the surface of the photovoltaic cell wafer is passivated, the photovoltaic cell wafer to be processed is usually placed on the loading section 10 equipped with a conveying mechanism, and then the photovoltaic cell wafer passes through the degreasing section 30, the water washing section 40 and the inspection section 50 and then enters the reaction tank of the passivation section 60 of the passivation equipment. In the passivation tank, the passivation liquid medicine is sprayed onto the surface of the photovoltaic cell wafer by spraying. A chemical reaction occurs between the surface of the photovoltaic cell wafer and the liquid medicine, and then a passivation film is formed. The previous surface treatment method has high cost and low efficiency. Summary of the Utility Model

[0004] In order to solve the above technical problems, the present application provides a surface passivation line for photovoltaic cell wafers.

[0005] The purpose of the utility model is to provide a surface passivation line for photovoltaic cell wafers, including: a roller conveying mechanism and an oil removal unit for removing oil stains or dirt on the surface of the photovoltaic cell wafer, a primary overflow water washing unit for cleaning the residual medicine during degreasing, a detection unit for detecting whether there is residual medicine or defects on the surface of the photovoltaic cell wafer, a passivation unit for passivating the surface of the photovoltaic cell wafer to form a passivation film on the surface of the detected photovoltaic cell wafer, a secondary overflow water washing unit for cleaning the residual medicine during passivation, and a water blowing unit for blowing dry the water on the surface of the photovoltaic cell wafer, which are arranged in sequence along the conveying direction of the roller conveying mechanism; the passivation unit includes a first medicine storage tank, a first pump body connected to the first medicine storage tank, and a plurality of first nozzles connected to the first pump body through a pipeline, and the spraying water pressure of each first nozzle is the same. The reaction time of the medicine in the passivation section of the passivation unit is 90 - 300 sec.

[0006] Furthermore, the oil removal unit is provided with a second medicine storage tank for storing the degreasing liquid medicine, a second pump body connected to the second medicine storage tank, and a plurality of second nozzles symmetrically arranged on the upper and lower sides of the roller conveying mechanism and connected to the second pump body through a pipeline. The reaction time of the medicine in the oil removal section is 60 - 120 sec.

[0007] Further, the primary overflow water washing unit and the secondary overflow water washing unit are each provided with at least three water washing sections arranged along the conveying direction of the roller conveying mechanism. Each water washing section is provided with a third pump body connected to an external water source and a number of third spray heads symmetrically arranged on the upper and lower sides of the roller conveying mechanism and connected to the third pump body through pipes, with a water consumption of 3 - 6 L / min.

[0008] Further, the first spray head, the second spray head, and the third spray head are provided with regulating valves for adjusting the spray pressure and water pressure gauges for detecting the water pressure.

[0009] Further, the degreasing unit, the primary overflow water washing unit, the passivation unit, and the secondary overflow water washing unit are each provided with a secondary tank.

[0010] Further, the air drying unit includes a blower and an air knife arranged on the roller conveying mechanism. The air drying section of the air knife is partitioned into a strong wind section and a hot air section by a partition. The exhaust volume of the strong wind section is 4 - 8 m 3 / / min, and the exhaust volume of the hot air section is 3 - 6 m 3 / / min.

[0011] Further, the roller conveying mechanism is composed of a conveyor roller system, a chain, and a motor. The conveying speed of the roller conveying mechanism is set to be adjustable from 0.5 to 5 m / min.

[0012] The technical solution of the present utility model has the following advantages compared with the prior art: The present utility model provides a surface passivation line for photovoltaic cells. By sequentially arranging a degreasing unit, a primary overflow water washing unit, a detection unit, a passivation unit, a secondary overflow water washing unit, and an air drying unit along the roller conveying mechanism, the electroplating of photovoltaic cells can be completed on one line, forming a passivation film on the surface of the copper grid, which can protect the surface of the copper grid circuit from oxidation, complete multiple processes of surface passivation of photovoltaic cells in one stop, improve production efficiency, and effectively reduce costs; a passivation film is generated on the surface of the photovoltaic cell, which does not affect the conductivity and solderability of the copper circuit, only reacts chemically with copper, and there is no product in the area outside the copper circuit of the cell, which does not affect the light absorption of the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of one angle of the present utility model;

[0014] Figure 2 is Figure 1 a schematic structural diagram of another perspective in the illustrated embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0016] In the present utility model, unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art to which the present utility model pertains. The terms "first", "second", and similar terms used in the specification and claims of the present utility model patent application do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "a" or "an", and the like, do not denote a limitation of quantity, but indicate the existence of at least one.

[0017] Please refer to Figure 1 and Figure 2 , this embodiment provides a surface passivation line for photovoltaic cells. The surface passivation line for photovoltaic cells includes a roller conveying mechanism 10 composed of a fuselage, a conveying roller system, a chain, and a motor, and an oil removal unit 30, a primary overflow water washing unit 40, a detection unit 50, a passivation unit 60, a secondary overflow water washing unit 70, and a drying unit 80 arranged in sequence along the conveying direction of the roller conveying mechanism 10. A controller for controlling the coordinated operation of the roller conveying mechanism 10, the oil removal unit 30, the primary overflow water washing unit 40, the detection unit 50, the passivation unit 60, the secondary overflow water washing unit 70, and the drying unit 80 is provided outside the surface passivation line for photovoltaic cells;

[0018] The working process of the surface passivation line of the above photovoltaic cell is as follows: Place the photovoltaic cell on the conveying roller system at the loading section. The motor drives the chain to drive the conveying roller system to convey the photovoltaic cell. The conveying speed can be adjusted to 0.5 - 5 m / min. The photovoltaic cell enters the degreasing unit 30, and the degreasing unit 30 removes oil stains or dirt on the surface of the photovoltaic cell. After passing through the degreasing unit 30, it flows into the first overflow water washing unit 40. The first overflow water washing unit 40 cleans the remaining chemicals and substances on the photovoltaic cell. After passing through the first overflow water washing unit 40, the photovoltaic cell enters the detection unit 50. The detection unit 50 detects whether there are any remaining chemicals or defects on the surface of the photovoltaic cell. The detection unit 50 can use manual detection or a visual detection device for detection. After the detection is completed, the photovoltaic cell enters the passivation unit 60. The passivation unit 60 passivates the surface of the photovoltaic cell to form a passivation film on the detected surface of the photovoltaic cell. After being passivated by the passivation unit 60, the photovoltaic cell flows into the second overflow water washing unit 70. The second overflow water washing unit 70 cleans the remaining chemicals during passivation. After passing through the second overflow water washing unit 70, the photovoltaic cell flows into the drying unit 80. The drying unit 80 dries the water droplets on the surface of the photovoltaic cell to keep the photovoltaic cell in a dry state, avoiding problems such as corrosion or oxidation during subsequent storage. After the photovoltaic cell is dried, the rolling conveying roller system sends out the photovoltaic cell.

[0019] Among them, the degreasing unit 30 is used to remove oil stains or dirt on the surface of the photovoltaic cell. The degreasing unit 30 is provided with a second chemical storage tank for storing degreasing chemicals, a second pump body connected to the second chemical storage tank, and a number of second spray heads symmetrically arranged on the upper and lower sides of the roller conveying mechanism 10 and connected to the second pump body through a pipeline. The reaction time of the chemicals in the degreasing section is 60 - 120 sec. By setting the upper and lower symmetric second spray heads, it is possible to degrease both surfaces of the photovoltaic cell simultaneously without flipping the photovoltaic cell, improving efficiency.

[0020] The first overflow water washing unit 40 and the second overflow water washing unit 70 are mainly used to clean the remaining chemicals and stains on the photovoltaic cell. The first overflow water washing unit 40 and the second overflow water washing unit 70 are provided with at least 3 water washing sections arranged along the conveying direction of the roller conveying mechanism 10. Each water washing section has a third pump body connected to an external water source and a number of third spray heads symmetrically arranged on the upper and lower sides of the roller conveying mechanism 10 and connected to the third pump body through a pipeline. The water consumption is 3 - 6 L / min. By setting 3 water washing sections, it is possible to effectively clean both surfaces of the photovoltaic cell.

[0021] In addition, in this embodiment, two passivation units 60 are provided along the conveying direction of the roller conveying mechanism 10. The passivation unit 60 includes a first chemical solution storage tank, a first pump body connected to the first chemical solution storage tank, and a plurality of first spray heads connected to the first pump body through a pipeline. The plurality of first spray heads are symmetrically arranged on the upper and lower sides of the roller conveying mechanism 10 through the pipeline. The chemical solution reaction time of each passivation unit 60 in the passivation section is 90 - 300 sec. By providing two passivation units 60, the surface of the photovoltaic cell can be effectively passivated, avoiding the problem that some positions of the photovoltaic cell are not passivated.

[0022] To avoid the problem that the spraying pressure of the first spray head, the first spray head and the third spray head is too high, or the pressure of one or more of the first spray head, the first spray head and the third spray head is unbalanced, resulting in uneven spraying of the photovoltaic cell or the photovoltaic cell being shot through or deformed due to excessive pressure. For this reason, each first spray head, the first spray head and the third spray head are provided with an adjustment valve for adjusting the spraying pressure and a water pressure gauge for detecting the water pressure. The pressure of each spray head is adjusted by adjusting the adjustment valve to ensure that the pressure of each spray head is the same. In this embodiment, the water pressure is set to 2 - 3 bar.

[0023] In order to effectively collect the chemical solutions and cleaning water used in the degreasing unit 30, the first overflow water washing unit 40, the passivation unit 60 and the second overflow water washing unit 70, auxiliary tank water tanks are provided in the degreasing unit 30, the first overflow water washing unit 40, the passivation unit 60 and the second overflow water washing unit 70. The auxiliary tank water tank is provided with a drain port, and each auxiliary tank water tank is connected to an external recycling and treatment device through a pipeline.

[0024] Among them, the air drying unit 80 includes a blower and a hot air knife provided on the roller conveying mechanism 10. The air drying section of the hot air knife is partitioned into a strong wind section and a hot air section by a partition board, and is communicated with the strong wind section and the hot air section respectively through an exhaust duct, and a valve is provided on the exhaust duct to adjust the amount of incoming air. The exhaust air volume of the strong wind section is 4 - 8 m 3 / / min, and the exhaust air volume of the hot air section is 3 - 6 m 3 / / min. By providing the strong wind section and the hot air section, the water on the surface of the photovoltaic cell can be well dried.

[0025] In summary, the present utility model provides a surface passivation line for photovoltaic cells. By sequentially arranging an oil removal unit 30, a primary overflow water washing unit 40, a detection unit 50, a passivation unit 60, a secondary overflow water washing unit 70, and a drying unit 80 along the roller conveying mechanism 10, electroplating of photovoltaic cells can be completed in one line, a passivation film is formed on the surface of the copper grid, which can protect the surface of the copper grid circuit from oxidation, and multiple processes for surface passivation of photovoltaic cells can be completed in one stop, improving production efficiency and effectively reducing costs. A passivation film is generated on the surface of the photovoltaic cells, which does not affect the conductivity and solderability of the copper circuit, only chemically reacts with copper, and there is no product in the area outside the copper circuit of the cell, which does not affect the light absorption of the cell.

[0026] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0027] The above-described embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A surface passivation line for a photovoltaic cell, characterized in that Including: A roller conveying mechanism, and an oil removal unit for removing oil stains or dirt on the surface of a photovoltaic cell, a primary overflow water washing unit for washing the remaining chemical solution during oil removal, a detection unit for detecting whether there is any remaining chemical solution or defect on the surface of the photovoltaic cell, a passivation unit for passivating the surface of the photovoltaic cell to form a passivation film on the surface of the detected photovoltaic cell, a secondary overflow water washing unit for washing the remaining chemical solution during passivation, and a water blowing unit for blowing dry the water on the surface of the photovoltaic cell, which are sequentially arranged along the conveying direction of the roller conveying mechanism; the passivation unit includes a first chemical solution storage tank, a first pump body connected to the first chemical solution storage tank, and a plurality of first spray heads connected to the first pump body through a pipeline. The spray water pressure of each first spray head is the same, and the reaction time of the chemical solution in the passivation section of the passivation unit is 90 - 300 sec.

2. The surface passivation line of the photovoltaic cell according to claim 1, wherein, The oil removal unit is provided with a second chemical solution storage tank for storing the oil removal chemical solution, a second pump body connected to the second chemical solution storage tank, and a plurality of second spray heads connected to the second pump body through a pipeline and symmetrically arranged on the upper and lower sides of the roller conveying mechanism. The reaction time of the chemical solution in the oil removal section is 60 - 120 sec.

3. The surface passivation line of a photovoltaic cell according to claim 2, wherein The primary overflow water washing unit and the secondary overflow water washing unit are each provided with at least 3 water washing sections arranged along the conveying direction of the roller conveying mechanism. Each water washing section has a third pump body connected to an external water source, and a plurality of third spray heads connected to the third pump body through a pipeline and symmetrically arranged on the upper and lower sides of the roller conveying mechanism. The water consumption is 3 - 6 L / min.

4. The surface passivation line of a photovoltaic cell according to claim 3, characterized in that, The first spray heads, the second spray heads, and the third spray heads are provided with regulating valves for adjusting the spray pressure and water pressure gauges for detecting the water pressure.

5. The surface passivation line of the photovoltaic cell according to claim 1, characterized in that, The oil removal unit, the primary overflow water washing unit, the passivation unit, and the secondary overflow water washing unit are each provided with an auxiliary tank.

6. The surface passivation line of a photovoltaic cell according to claim 1, wherein The drying unit includes a blower and an air knife provided on the roller conveying mechanism. The drying section of the air knife is partitioned into a strong wind section and a hot air section by a partition. The exhaust air volume of the strong wind section is 4 - 8 m 3 / min, and the exhaust air volume of the hot air section is 3 - 6 m 3 / min.

7. The surface passivation line of a photovoltaic cell according to claim 1, characterized in that, The roller conveying mechanism is composed of a conveying roller system, a chain, and a motor. The conveying speed of the roller conveying mechanism is set to be adjustable from 0.5 to 5 m / min.

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