Coating liquid assembly and passivation apparatus for side passivation of photovoltaic cells

Abstract

This application relates to the field of photovoltaic equipment technology and provides a coating component for side passivation of photovoltaic cells, including a housing with at least one coating tank inside the housing, each coating tank having a coating window on at least one side; and a liquid storage soft body disposed in the coating tank, the liquid storage soft body being exposed to the outside through the coating window. The coating component of this application exposes the liquid storage soft body to a specific side through the coating window, allowing direct coating of the side of the cell, and ensuring that the passivation liquid is only coated on the side of the cell, avoiding contamination of the surface area of ​​the cell. Furthermore, the liquid storage soft body can continuously release liquid through squeezing or capillary action to form a uniform coating, reducing the risk of dripping or liquid interruption. In addition, the liquid storage soft body makes flexible contact with the side of the cell, avoiding microcracks or scratches on the cell caused by hard nozzles or spraying pressure.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic equipment technology, and in particular relates to a coating liquid component and passivation equipment for passivation of the side of photovoltaic cells. 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. To further improve the performance of solar modules, there has been a recent demand for passivating the sides of the cells. However, current passivation equipment used for surface passivation is not suitable for side passivation, resulting in excessively long passivation times and poor passivation effects. Utility Model Content

[0003] This application provides a coating module for passivating the side of photovoltaic cells, aiming to solve the problem that current passivation equipment used for cell surface passivation is not suitable for passivating the side of cells, resulting in excessively long passivation time and poor passivation effect.

[0004] In a first aspect, this application is implemented as follows: a coating component for side passivation of photovoltaic cells includes a housing, the housing having at least one coating tank, each coating tank having a coating window on at least one side; and a liquid storage device disposed in the coating tank, the liquid storage device being exposed to the outside through the coating window.

[0005] Optionally, the housing is provided with a liquid replenishment channel, which is connected to the coating tank.

[0006] Optionally, two coating windows are provided opposite to each other on the front and rear sides of the coating tank.

[0007] Optionally, the system also includes a liquid storage tank disposed within the housing, the liquid storage tank being connected to the coating tank, the liquid storage tank being used to store passivation liquid overflowing from the coating tank.

[0008] Optionally, the liquid storage tank is disposed at the end of the housing, and the height of the liquid storage tank is lower than the height of the coating tank.

[0009] Optionally, it also includes a reflux hole penetrating the side wall of the housing, the reflux hole communicating with the coating tank, the reflux hole being used for the reflux of passivation liquid in the coating tank.

[0010] Optionally, the liquid storage device is at least partially provided with a dust-free cloth.

[0011] Optionally, the replenishment channel includes at least one main channel and at least one branch channel corresponding to the main channel, wherein at least one branch channel is connected to the main channel.

[0012] Optionally, a plurality of the flow channels are spaced apart along the length of the housing.

[0013] Optionally, the liquid storage soft body includes a sponge.

[0014] The coating assembly of this application exposes the liquid storage soft body to a specific side through the coating window, which can directly coat the side of the battery cell and ensure that the passivation liquid is only coated on the side of the battery cell, avoiding contamination of the surface area of ​​the battery cell. Furthermore, the liquid storage soft body can continuously release liquid through squeezing or capillary action to form a uniform coating, reducing the risk of dripping or liquid interruption. In addition, the liquid storage soft body makes flexible contact with the side of the battery cell, avoiding microcracks or scratches on the battery cell caused by hard nozzles or spraying pressure.

[0015] Secondly, a device for side passivation of photovoltaic cells includes the coating liquid component for side passivation of photovoltaic cells described in the first aspect. The technical effects of this application are the same as those of the coating liquid component described above, and will not be repeated here. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first type of coating module for side passivation of photovoltaic cells provided in the current application;

[0017] Figure 2 This is a schematic diagram of the structure of the second type of coating module for side passivation of photovoltaic cells provided in the current application;

[0018] Figure 3 This is a schematic diagram of the structure of the third type of coating module for side passivation of photovoltaic cells provided in the current application;

[0019] Figure 4 This is a schematic diagram of the structure of the fourth type of coating module for side passivation of photovoltaic cells provided in the current application;

[0020] Figure 5 This is a schematic diagram of the fifth type of coating module for passivating the side of photovoltaic cells provided in the current application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100, Housing; 200, Coating tank; 300, Coating window; 400, Liquid storage device; 500, Liquid replenishment channel; 501, Main channel; 502, Branch channel; 600, Liquid storage tank; 700, Return hole. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] like Figure 1 and Figure 2 As shown in the embodiments of this application, a coating assembly for side passivation of photovoltaic cells includes a housing 100, and the housing 100 has at least one coating tank 200. The coating tank 200 can be one or two, and this application does not impose any limitation on this. Each coating tank 200 can correspond to one or two solar cells, and the number of coating tanks 200 determines the number of solar cells that the coating assembly can passivate simultaneously. If there are two or more coating tanks 200, the multiple coating tanks 200 can be spaced apart along the length of the housing 100 to facilitate the arrangement of the solar cells to be coated.

[0030] Each coating tank 200 has a coating window 300 on at least one side. That is, the coating tank 200 can have a coating window 300 on one side or multiple sides. The number and position of the coating windows 300 can be set, and this application does not limit this. Preferably, two coating windows 300 are arranged opposite each other on the front and rear sides of the coating tank 200. This allows the liquid storage soft body 400 located within the coating tank 200 to be exposed to the outside on both the front and rear sides simultaneously. The coating assembly can simultaneously spin-coat the passivation liquid onto the battery cells located on both the front and rear sides, improving production efficiency. Exemplarily, the liquid storage soft body 400 includes a sponge, which can achieve soft contact with the battery cells. Of course, in other embodiments, the liquid storage soft body 400 can also be soft silicone, and this application does not limit this.

[0031] The coating component of this application exposes the liquid storage soft body 400 to a specific side through the coating window 300, ensuring that the passivation liquid is only coated on the side of the cell, avoiding contamination of the surface area of ​​the cell. Furthermore, the liquid storage soft body 400 can continuously release liquid through squeezing or capillary action to form a uniform coating, reducing the risk of dripping or liquid interruption. In addition, the liquid storage soft body 400 is in flexible contact with the side of the cell, avoiding microcracks or scratches on the cell caused by hard nozzles or spraying pressure.

[0032] In some embodiments, a liquid replenishment channel 500 is provided on the housing 100, and the liquid replenishment channel 500 is connected to the coating tank 200. The liquid replenishment channel 500 is provided to replenish the liquid in the coating tank 200, so that the liquid storage soft body 400 located in the coating tank 200 will not run out of liquid during the spin coating process. This is beneficial for continuously and uninterruptedly coating the side of the battery cell, and the liquid storage soft body 400 can be continuously replenished and kept moist, thus ensuring the uniformity of the passivation liquid spin coating on the side of the battery cell.

[0033] like Figure 4 As shown, in some embodiments, the coating assembly further includes a reservoir 600 disposed within the housing 100. The reservoir 600 is connected to the coating tank 200, and the reservoir 600 is used to store the passivation liquid overflowing from the coating tank 200. On one hand, the reservoir 600 acts as a buffer container, automatically replenishing the passivation liquid consumed by the coating tank 200 through the connecting structure, ensuring a continuous and stable liquid supply at the coating window 300, and avoiding intermittent coating or uneven thickness due to insufficient liquid. On the other hand, excess passivation liquid in the coating tank 200 (such as the portion not coated through the window) can flow back to the reservoir 600 and be reused after recirculation, reducing material loss. Furthermore, the reservoir 600 is disposed at the end of the housing 100, and the height of the reservoir 600 is lower than the height of the coating tank 200. Understandably, the liquid storage tank 600 located at the end of the housing 100 can better collect excess passivation liquid in the coating tank 200, ensuring stable wetting of the liquid-storing soft body 400 within the coating tank 200, which is beneficial for forming a uniform passivation layer. The fact that the height of the liquid storage tank 600 is lower than that of the coating tank 200 means that the height of the bottom wall of the liquid storage tank 600 is lower than that of the coating tank 200, allowing excess passivation liquid in the coating tank 200 to collect in the liquid storage tank 600. Specifically, the bottom surface of the coating tank 200 can be inclined, and the liquid storage tank 600 can be located at the lowest point of the bottom surface of the coating tank 200, which facilitates the rapid flow of excess passivation liquid from the coating tank 200 into the liquid storage tank 600.

[0034] like Figure 3 As shown, the coating assembly also includes a return hole 700 penetrating the side wall of the housing 100. The return hole 700 communicates with the coating tank 200 and is used for the return of passivation liquid within the coating tank 200. Understandably, the return hole 700 is positioned close to the bottom wall of the coating tank 200, allowing for the complete return of excess passivation liquid within the coating tank 200. The return hole 700 can be externally connected to a return pipeline to return the passivation liquid within the coating tank 200.

[0035] In some embodiments, the liquid storage soft body 400 is at least partially provided with a lint-free cloth (not shown in the figure). Exemplarily, a lint-free cloth can be provided on one side of the liquid storage soft body 400, exposed to the outside through the coating window 300. The lint-free cloth allows for more uniform wetting of the sponge. Preferably, lint-free cloths are provided on three sides of the liquid storage soft body 400, wrapping the liquid storage soft body 400 within them, which better secures the lint-free cloth within the coating tank 200.

[0036] like Figure 5 As shown, in some embodiments, the replenishment channel 500 includes at least one main channel 501 and at least one branch channel 502 corresponding to the main channel 501, with the branch channel 502 connected to the main channel 501. There are multiple branch channels 502, each connected to the main channel 501. Specifically, one liquid storage soft body 400 can be provided with one main channel 501. The main channel 501 is used for external liquid supply pipelines. The passivation liquid in the main channel 501 flows into the coating tank 200 through one or more branch channels 502, allowing simultaneous replenishment of different positions within the coating tank 200, enabling rapid and uniform diffusion and absorption of the passivation liquid within the liquid storage soft body 400. Exemplarily, there can be one, two, or more branch channels 502. The number of branch channels 502 can be set according to the length of the liquid storage soft body 400, and this application does not impose any limitations on this. Preferably, multiple branch channels 502 are spaced apart along the length of the housing 100. This allows for simultaneous liquid supply to different parts of the liquid storage software 400.

[0037] In some embodiments, a device for passivating the side of a photovoltaic cell includes the aforementioned coating liquid assembly for passivating the side of a photovoltaic cell. The technical effects of this application are the same as those of the coating liquid assembly described above, and will not be repeated here.

[0038] 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.

[0039] 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 coating module for passivating the sides of photovoltaic cells, characterized in that, The device includes a housing, which has at least one coating tank, each of which has a coating window on at least one side; and a liquid storage device disposed within the coating tank, which is exposed to the outside through the coating window.

2. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, The housing is provided with a liquid replenishment channel, which is connected to the coating tank.

3. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, Two coating windows are arranged opposite each other on the front and back sides of the coating tank.

4. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, It also includes a liquid storage tank disposed within the housing, the liquid storage tank being connected to the coating tank, the liquid storage tank being used to store passivation liquid overflowing from the coating tank.

5. The coating module for side passivation of photovoltaic cells as described in claim 4, characterized in that, The liquid storage tank is located at the end of the housing, and the height of the liquid storage tank is lower than the height of the coating tank.

6. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, It also includes a reflux hole penetrating the side wall of the housing, the reflux hole being connected to the coating tank, and the reflux hole being used for the reflux of passivation liquid in the coating tank.

7. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, The liquid storage device is at least partially covered with a dust-free cloth.

8. The coating module for side passivation of photovoltaic cells as described in claim 2, characterized in that, The replenishment channel includes at least one main channel and at least one branch channel corresponding to the main channel, and at least one branch channel is connected to the main channel.

9. The coating module for side passivation of photovoltaic cells as described in claim 8, characterized in that, The plurality of the flow channels are spaced apart along the length of the housing.

10. The coating module for side passivation of photovoltaic cells as described in claim 1, characterized in that, The liquid storage device includes a sponge.

11. A device for passivating the side surfaces of photovoltaic cells, characterized in that, The coating component for side passivation of photovoltaic cells as described in any one of claims 1-10 above.

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