Liquid supply system of photovoltaic cell side passivation equipment and passivation equipment

Abstract

The application is suitable for the field of photovoltaic devices, and provides a liquid supply system of a photovoltaic cell side passivation device and the passivation device. The liquid supply system comprises a liquid supply device, a liquid supply end and a liquid return end of the liquid supply device, a liquid distribution assembly, the liquid distribution assembly being communicated with the liquid supply end of the liquid supply device, the liquid distribution assembly having a plurality of liquid distribution channels, each of the liquid distribution channels being connected to a liquid inlet end of a liquid coating tool, and a liquid collector, one end of the liquid collector being communicated with a liquid outlet end of the liquid coating tool, and the other end of the liquid collector being communicated with the liquid return end of the liquid supply device. The liquid collector is arranged to collect the passivation liquid overflowing from the liquid coating tool. The liquid collector can return the collected passivation liquid to the liquid supply device according to the requirement, to form a recycling use of the passivation liquid, improve the utilization efficiency of the passivation liquid, and reduce the production cost of the photovoltaic cell.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic equipment, and in particular relates to a liquid supply system and passivation equipment for a side passivation device of a photovoltaic cell. Background Technology

[0002] Solar cells (also known as photovoltaic cells) are devices that utilize solar energy, directly converting light energy into electrical energy through the photoelectric effect or photochemical effect. To improve the efficiency of solar cells, the surface of the cells is typically passivated to reduce recombination centers for charge carriers. However, current photovoltaic cell passivation liquid supply devices cannot recover excess passivation liquid during supply, resulting in overflow and waste, leading to high production costs and severe environmental pollution. Utility Model Content

[0003] This application provides a liquid supply system for a photovoltaic cell side passivation device, which aims to solve the problem that current photovoltaic cell passivation liquid supply devices cannot recover excess passivation liquid during liquid supply, resulting in passivation liquid overflow and waste, leading to high production costs and serious environmental pollution.

[0004] Firstly, this application is implemented as follows: a liquid supply system for a photovoltaic cell side passivation device, the liquid supply system being used to supply liquid to a coating fixture, the coating fixture having an inlet end and an outlet end, comprising: a liquid feeder, the liquid feeder having a supply end and a return end; a liquid distribution assembly, the liquid distribution assembly being connected to the supply end of the liquid feeder, the liquid distribution assembly having multiple liquid distribution channels, each of the liquid distribution channels being correspondingly connected to the inlet end of the coating fixture; and a liquid collector, one end of the liquid collector being connected to the outlet end of the coating fixture, and the other end of the liquid collector being connected to the return end of the liquid feeder.

[0005] Optionally, the liquid distribution assembly includes a liquid supply line and multiple liquid distribution lines connected to one end of the liquid supply line, the other end of the liquid supply line being connected to the liquid supply end of the liquid feeder, and the multiple liquid distribution lines forming multiple liquid distribution channels.

[0006] Optionally, the liquid dispensing assembly further includes a liquid dispensing base, which has a liquid supply channel and multiple liquid dispensing channels. The multiple liquid dispensing channels are respectively connected to the liquid supply channel. The liquid supply pipeline is connected to the liquid dispensing channel, and the multiple liquid dispensing pipelines are connected to the multiple liquid dispensing channels in a one-to-one correspondence. Multiple liquid dispensing valves are disposed on the liquid dispensing base, and the multiple liquid dispensing valves independently and alternately control the opening or closing of the corresponding liquid dispensing channel.

[0007] Optionally, the liquid distribution base also has an exhaust channel, and the plurality of liquid distribution channels are respectively connected to the exhaust channel, and an exhaust valve is provided in the exhaust channel.

[0008] Optionally, it also includes a first air inlet pipe disposed on the top of the liquid dispenser. The first air inlet pipe includes a first ventilation section passing through the top of the liquid dispenser and a first air intake section communicating with the first ventilation section. The first air intake section is bent toward the top of the liquid dispenser to form a first elbow structure.

[0009] Optionally, a first liquid level sensor is provided inside the liquid supply device.

[0010] Optionally, the other end of the liquid collector is connected to the return end of the liquid supply device via a return liquid pipeline, and a pump body is installed on the return liquid pipeline.

[0011] Optionally, it also includes a second air inlet pipe disposed at the top of the liquid collector. The second air inlet pipe includes a second ventilation section passing through the top of the liquid collector and a second air inlet section communicating with the second ventilation section. The second air inlet section is bent toward the top of the liquid collector to form a second elbow structure.

[0012] Optionally, a second liquid level sensor is provided inside the liquid collector.

[0013] Optionally, the liquid supply device is positioned higher than the liquid collector, and the liquid supply direction of the liquid supply line is opposite to the liquid return direction of the liquid return line.

[0014] This application incorporates a liquid collector to collect passivation liquid overflowing from the coating fixture. The liquid collector can return the collected passivation liquid to the liquid supply unit as needed, forming a recycling system for the passivation liquid, improving its utilization efficiency and reducing the production cost of photovoltaic cells. In addition, the liquid supply unit supplies liquid to the liquid distribution unit, which has multiple distribution channels. Each distribution channel is connected to the inlet end of the coating fixture. The liquid distribution unit divides the passivation liquid flowing into it through multiple distribution channels, allowing it to flow evenly to different positions on the same coating fixture. Alternatively, the liquid distribution unit can supply liquid to multiple coating fixtures simultaneously, improving the uniformity of the passivation liquid spin coating.

[0015] Secondly, a device for side passivation of photovoltaic cells includes the aforementioned liquid supply system for side passivation of photovoltaic cells. The technical effects of this application are the same as those of the aforementioned liquid supply system, and will not be repeated here. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the liquid supply system of the photovoltaic cell side passivation equipment provided in the current application;

[0017] Figure 2 This is a three-dimensional structural diagram of the liquid supply system of the photovoltaic cell side passivation equipment currently applied for;

[0018] Figure 3 This is a schematic diagram of the liquid distribution base of the liquid supply system of the photovoltaic cell side passivation equipment currently applied for.

[0019] Explanation of reference numerals in the attached figures:

[0020] 10. Coating fixture; 100. Liquid feeder; 200. Liquid distribution assembly; 201. Liquid supply line; 202. Liquid distribution line; 203. Liquid distribution base; 2031. Liquid supply channel; 2032. Liquid distribution channel; 204. Liquid distribution valve; 205. Exhaust valve; 300. Liquid collector; 400. First air inlet pipe; 401. First ventilation section; 402. First air intake section; 500. First liquid level sensor; 600. Return line; 700. Pump body; 800. Second air inlet pipe; 801. Second ventilation section; 802. Second air intake section; 900. Second liquid level sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] like Figure 1 and Figure 2 As shown in the embodiment of this application, a liquid supply system for a photovoltaic cell side passivation device is provided. The liquid supply system is used to supply liquid to the coating fixture 10. The coating fixture 10 has an inlet end and an outlet end. The inlet end of the coating fixture 10 is used to replenish the passivation liquid, and the outlet end of the coating fixture is used to return excess passivation liquid. The coating fixture 10 is used to coat the side of the cell with liquid.

[0028] The liquid supply system includes a liquid feeder 100, a liquid distribution assembly 200, and a liquid collector 300. Understandably, the liquid feeder 100 and the liquid distribution assembly 200, the coating fixture 10 and the liquid collector 300, and the liquid collector 300 and the liquid feeder 100 can all be connected via pipelines. The liquid feeder 100 has a supply end and a return end. The liquid feeder 100 can be a box structure with a hollow interior, storing passivating liquid. The liquid distribution assembly 200 is connected to the supply end of the liquid feeder 100, supplying liquid to the liquid distribution assembly 200. The liquid distribution assembly 200 has multiple distribution channels, each corresponding to the inlet end of the coating fixture 10. The liquid distribution assembly 200 distributes the passivating liquid flowing into it through these multiple channels, allowing it to flow evenly to different locations within the same coating fixture 10, or... The liquid distribution component 200 can supply liquid to multiple coating fixtures 10 simultaneously. One end of the liquid collector 300 is connected to the liquid outlet of the coating fixture 10, and the other end of the liquid collector 300 is connected to the liquid return end of the liquid supplier 100. The liquid collector 300 can also be a box structure with a hollow interior. The liquid collector 300 is used to collect the passivation liquid overflowing from the coating fixture 10. The liquid collector 300 can return the collected passivation liquid to the liquid supplier 100 as needed, forming a recycling of the passivation liquid, improving the utilization efficiency of the passivation liquid, and reducing the production cost of photovoltaic cells.

[0029] In some embodiments, the liquid distribution assembly 200 includes a liquid supply line 201 and a plurality of liquid distribution lines 202 connected to one end of the liquid supply line 201. The other end of the liquid supply line 201 is connected to the liquid supply end of the liquid feeder 100, and the plurality of liquid distribution lines 202 form a plurality of liquid distribution channels. The passivation liquid in the liquid feeder 100 flows into the liquid supply line 201 and then flows to each of the liquid distribution lines 202 respectively, thereby achieving the diversion of the passivation liquid. This design enables precise liquid supply through multiple channels, improving production efficiency. The plurality of liquid distribution lines 202 can simultaneously supply liquid to different coating fixtures 10, significantly improving the production cycle and making it suitable for high-speed automated production lines. In addition, the symmetrical layout of the liquid distribution lines 202 ensures that the liquid flow rate output from each channel is consistent. Uniform liquid distribution helps maintain the consistency of coating thickness and composition, improving the performance of the solar cells.

[0030] In some embodiments, the liquid distribution assembly 200 further includes a liquid distribution base 203, which has a liquid supply channel 2031 and multiple liquid distribution channels 2032. The multiple liquid distribution channels 2032 are respectively connected to the liquid supply channel 2031. The liquid supply line 201 is connected to the liquid distribution channel 2032, and multiple liquid distribution lines 202 are connected to the multiple liquid distribution channels 2032 in a one-to-one correspondence. The liquid supply channel 2031 serves as the main channel, directly connected to the liquid supply line 201, and receives the passivation liquid from the liquid feeder 100. Each liquid distribution channel 2032 (matching the number of liquid distribution lines 202) is connected to the liquid supply channel 2031, distributing the liquid to each coating point. The multiple liquid distribution channels 2032 can be symmetrically distributed, such as radially, tree-like, or matrix-like arrangements, to ensure balanced fluid resistance. In other embodiments, the cross-section of the liquid supply channel 2031 or each liquid distribution channel 2032 can adopt a gradually changing diameter or streamlined design to reduce turbulence and pressure loss. Understandably, the geometry (e.g., length, cross-sectional area) of each liquid distribution channel 2032 is calculated through simulation to ensure consistent flow rate in each channel, thereby guaranteeing uniform spin coating of the passivation liquid on the sides of each battery cell. Through the design of the aforementioned multiple liquid distribution channels 2032, this application ensures that even if one liquid distribution channel 2032 is temporarily blocked, the other channels can still maintain a stable liquid supply.

[0031] like Figure 1 and Figure 3 As shown, furthermore, multiple dispensing valves 204 are disposed on the dispensing base 203. Each dispensing valve 204 independently and alternately controls the opening or closing of its corresponding dispensing channel 2032. Each dispensing valve 204 corresponds to one dispensing channel 2032 and can be opened or closed individually without interference. That is, each dispensing valve 204 opens and closes in turn, rather than simultaneously, thus ensuring a relatively stable liquid supply to each path. Furthermore, when multiple different liquid supply lines 201 are provided, different liquids can be delivered to each liquid supply line 201 through combinations of the dispensing valves 204.

[0032] In some embodiments, the dispensing base 203 also has an exhaust channel (not shown in the figure), and multiple dispensing channels 2032 are respectively connected to the exhaust channel. The exhaust channel can be connected to an exhaust pipe, and an exhaust valve 205 is installed in the exhaust channel or on the exhaust pipe. When air accumulates in the dispensing pipe 202 and affects the normal liquid supply, the exhaust valve 205 can be opened to release the air. With the above design, only one exhaust valve 205 is needed to ensure the normal liquid supply of each dispensing pipe 202.

[0033] The liquid supply system also includes a first air inlet pipe 400 disposed at the top of the liquid supply device 100. The first air inlet pipe 400 includes a first venting section 401 passing through the top of the liquid supply device 100 and a first air intake section 402 communicating with the first venting section 401. The first air intake section 402 is bent towards the top of the liquid supply device 100 to form a first elbow structure. In this embodiment, by providing a first air inlet pipe 400 at the top of the liquid supply device 100, the interior of the liquid supply device 100 is connected to the outside, balancing the internal and external pressures of the liquid supply device 100. This can prevent the negative pressure caused by the outflow of passivation liquid from the liquid supply device 100 from affecting the normal liquid supply of the liquid supply device 100. Specifically, the first air inlet pipe 400 includes a first ventilation section 401 and a first air inlet section 402. The first ventilation section 401 is installed at the top of the liquid dispenser 100 to ensure that the air inlet is located at a high position, reducing the risk of bottom sediment inhalation. The first air inlet section 402 is connected to the first ventilation section 401. The first air inlet section 402 bends towards the top of the liquid dispenser 100 to form a first elbow structure. The air inlet of the first air inlet section 402 faces downward. The first elbow structure forces a sudden change in airflow direction, forming a physical barrier. Pollutants must reverse their direction to enter. Large particles of pollutants fall after impacting the pipe wall due to inertia and cannot enter with the airflow. In this way, without affecting the air entering the interior of the liquid dispenser 100, pollutants can be effectively prevented from directly entering the liquid dispenser 100 from the first air inlet pipe 400. Preferably, a first liquid level sensor 500 is installed inside the liquid dispenser 100. The first liquid level sensor 500 can monitor the level of passivation liquid in the liquid supply unit 100 in real time and provide real-time feedback on the remaining amount of liquid in the liquid supply unit 100, so as to facilitate timely replenishment of passivation liquid and avoid interruption of liquid supply.

[0034] In some embodiments, the other end of the collector 300 is connected to the return end of the supply device 100 via a return pipe 600, and a pump body 700 is provided on the return pipe 600. By providing the pump body 700, this application can force the passivation liquid in the collector 300 to flow back to the supply device 100 through the return pipe 600, providing power for the return of the passivation liquid. Specifically, even when the supply device 100 is positioned higher than the collector 300, the pump body 700 can still allow the passivation liquid in the collector 300 to flow back to the supply device 100; the supply direction of the supply pipe 201 is opposite to the return direction of the return pipe 600.

[0035] The liquid supply system also includes a second air inlet pipe 800 disposed at the top of the liquid collector 300. The second air inlet pipe 800 includes a second venting section 801 passing through the top of the liquid collector 300 and a second air inlet section 802 communicating with the second venting section 801. The second air inlet section 802 bends towards the top of the liquid collector 300 to form a second elbow structure. In this embodiment, by providing a second air inlet pipe 800 at the top of the liquid collector 300, the interior of the liquid collector 300 is connected to the outside, balancing the internal and external pressures of the liquid collector 300. This can prevent the negative pressure caused by the outflow of passivation liquid from the liquid collector 300 from affecting the normal return of liquid in the liquid collector 300. Specifically, the second air inlet pipe 800 includes a second ventilation section 801 and a second air inlet section 802. The second ventilation section 801 passes through the top of the liquid collector 300, ensuring that the air inlet is located at a high position, reducing the risk of bottom sediment inhalation. The second air inlet section 802 is connected to the second ventilation section 801. The second air inlet section 802 bends towards the top of the liquid collector 300 to form a second elbow structure. The air inlet of the second air inlet section 802 faces downward. The second elbow structure forces a sudden change in airflow direction, forming a physical barrier. Pollutants must reverse their direction to enter. Large particles of pollutants fall after impacting the pipe wall due to inertia and cannot enter with the airflow. In this way, without affecting the air entering the interior of the liquid collector 300, pollutants can be effectively prevented from directly entering the liquid collector 300 from the second air inlet pipe 800. Preferably, a second liquid level sensor 900 is installed inside the liquid collector 300. The second liquid level sensor 900 can monitor the level of passivation liquid in the liquid collector 300 in real time and provide real-time feedback on the remaining amount of liquid in the liquid collector 300.

[0036] In some embodiments, a device for side passivation of photovoltaic cells includes the above-described liquid supply assembly for side passivation of photovoltaic cells, and further includes a coating fixture 10, wherein the liquid supply assembly supplies liquid to the coating fixture 10.

[0037] In the description of this specification, the use of terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., refers to specific features, structures, materials, or characteristics described in connection with the embodiments or examples, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid supply system for a photovoltaic cell side passivation device, the liquid supply system being used to supply liquid to a coating fixture, the coating fixture having an inlet end and an outlet end, characterized in that, include: Liquid feeder, the liquid feeder having a liquid supply end and a liquid return end; The liquid dispensing assembly is connected to the liquid supply end of the liquid feeder. The liquid dispensing assembly has multiple liquid dispensing channels, and each liquid dispensing channel is connected to the liquid inlet end of the coating tool. A liquid collector, one end of which is connected to the liquid outlet of the coating fixture, and the other end of which is connected to the liquid return end of the liquid supply device.

2. The liquid supply system of the photovoltaic cell side passivation equipment as described in claim 1, characterized in that, The liquid distribution assembly includes a liquid supply pipeline and multiple liquid distribution pipelines connected to one end of the liquid supply pipeline. The other end of the liquid supply pipeline is connected to the liquid supply end of the liquid feeder, and the multiple liquid distribution pipelines form multiple liquid distribution channels.

3. The liquid supply system of the photovoltaic cell side passivation equipment as described in claim 2, characterized in that, The liquid dispensing assembly further includes a liquid dispensing base, which has a liquid supply channel and multiple liquid dispensing channels. The multiple liquid dispensing channels are respectively connected to the liquid supply channel. The liquid supply pipeline is connected to the liquid dispensing channel. The multiple liquid dispensing pipelines are connected to the multiple liquid dispensing channels in a one-to-one correspondence. Multiple liquid dispensing valves are disposed on the liquid dispensing base. The multiple liquid dispensing valves independently and alternately control the opening or closing of the corresponding liquid dispensing channel.

4. The liquid supply system of the photovoltaic cell side passivation device as described in claim 3, characterized in that, The liquid distribution base also has an exhaust channel, and the plurality of liquid distribution channels are respectively connected to the exhaust channel, and an exhaust valve is provided in the exhaust channel.

5. The liquid supply system of the photovoltaic cell side passivation device as described in claim 1, characterized in that, It also includes a first air inlet pipe disposed on the top of the liquid dispenser. The first air inlet pipe includes a first ventilation section passing through the top of the liquid dispenser and a first air intake section communicating with the first ventilation section. The first air intake section is bent toward the top of the liquid dispenser to form a first elbow structure.

6. The liquid supply system of the photovoltaic cell side passivation equipment as described in claim 1, characterized in that, The liquid supply device is equipped with a first liquid level sensor.

7. The liquid supply system of the photovoltaic cell side passivation device as described in claim 1, characterized in that, The other end of the liquid collector is connected to the return end of the liquid supply device through a return liquid pipeline, and a pump body is installed on the return liquid pipeline.

8. The liquid supply system of the photovoltaic cell side passivation device as described in claim 1, characterized in that, It also includes a second air inlet pipe disposed at the top of the liquid collector. The second air inlet pipe includes a second ventilation section passing through the top of the liquid collector and a second air inlet section communicating with the second ventilation section. The second air inlet section is bent toward the top of the liquid collector to form a second elbow structure.

9. The liquid supply system of the photovoltaic cell side passivation device as described in claim 1, characterized in that, A second liquid level sensor is installed inside the liquid collector.

10. The liquid supply system of the photovoltaic cell side passivation device as described in claim 7, characterized in that, The liquid supply device is positioned higher than the liquid collector, and the liquid supply direction of the liquid supply pipeline is opposite to the liquid return direction of the liquid return pipeline.

11. A device for passivating the side surfaces of photovoltaic cells, characterized in that, The liquid supply system for the side passivation equipment of photovoltaic cells as described in any one of claims 1-10.

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