A photovoltaic module

Abstract

This application relates to the field of photovoltaic technology, and more particularly to photovoltaic modules. A photovoltaic module includes a stacked panel, a first adhesive layer, a cell string, a second adhesive layer, and a backsheet. Each cell string includes multiple cells connected in series. The photovoltaic module also includes a coating that shades the cells in a direction perpendicular to the panel. The area shaded by the coating varies in different areas of the same cell, but the total area shaded by the coating is the same for multiple cells on the same cell string. This application achieves diversified designs for photovoltaic modules by incorporating coatings, giving the modules a more aesthetically pleasing appearance, more closely resembling the texture and color of traditional roof tiles such as terracotta tiles and slate tiles. In this application, the position of the coating on the same cell is random, but the design aims to ensure that the total area covered by the coating on each cell is similar, guaranteeing that the area shaded by the coating on cells within the same string is consistent, thus ensuring the power generation capacity of the cell string.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more particularly to a photovoltaic module. Background Technology

[0002] In recent years, with the maturity of photovoltaic technology and the innovation of building materials, the performance and market acceptance of solar tiles have significantly improved. Changes in market demand are the core driving force behind the development of colored photovoltaic tiles. Modern architecture has increasingly higher aesthetic requirements, and traditional blue or black photovoltaic modules are difficult to meet the diverse architectural design needs, especially in historical preservation areas, high-end residential areas, and specific cultural buildings.

[0003] Therefore, the inherent contradiction between color performance and power generation efficiency constitutes the core challenge in the development of colored photovoltaic tiles. Traditional photovoltaic modules typically use dark colors, especially dark blue or black, to maximize light absorption efficiency. These colors can minimize light reflection and improve photoelectric conversion efficiency.

[0004] However, when photovoltaic modules need to be light-colored or other unconventional colors, some sunlight will inevitably be reflected rather than absorbed, directly affecting power generation efficiency. This efficiency loss is often unavoidable in the pursuit of architectural aesthetics. How to balance aesthetic needs and energy output has become the key to technological development. Utility Model Content

[0005] This application provides a photovoltaic module designed to achieve diversified designs for photovoltaic modules.

[0006] This application provides a photovoltaic module in a first aspect. The photovoltaic module includes a panel, a first adhesive layer, a cell string, a second adhesive layer, and a backsheet stacked together. Each cell string includes a plurality of cells connected in series. The photovoltaic module further includes: The coating, in a direction perpendicular to the panel, covers the battery cells. The area covered by the coating varies in different regions of the same battery cell, but the total area covered by the coating is the same for multiple battery cells located on the same battery string.

[0007] In one possible design, the toothed design is consistent with the panel, and the coating includes multiple discrete dot matrix patterns, wherein the spacing of the dot matrix patterns corresponding to the same battery cell is consistent but the size is inconsistent; or, the size of the dot matrix patterns corresponding to the same battery cell is consistent but the spacing is inconsistent; or, the size of the dot matrix patterns corresponding to the same battery cell is inconsistent and the spacing is inconsistent.

[0008] In one possible design, the minimum spacing between adjacent dot matrix patterns is H1, where H1 ≥ 0.1 mm.

[0009] In one possible design, the length of the dot matrix pattern is L1, where 0.05mm ≤ L1 ≤ 2mm.

[0010] In one possible design, the shape of the dot matrix pattern includes one or more of the following: circle, square, rhombus, triangle, polygon, and trapezoid.

[0011] In one possible design, the coating is applied to the side of the panel closest to the battery string.

[0012] In one possible design, the coating is applied to the side of the battery cell closest to the panel.

[0013] In one possible design, the coating is disposed with the first adhesive layer.

[0014] The beneficial effects of this application's embodiments are as follows: The photovoltaic module is coated to give it a gradient, layered, and semi-transparent appearance, enabling diverse designs and giving it a more aesthetically pleasing appearance, more closely resembling the texture and color of traditional roof tiles such as terracotta tiles and slate tiles. Furthermore, while the coating design on the photovoltaic module is random, the total area covered by the coating on each cell must be similar to ensure that the area of ​​the cells in the same string that is covered by the coating is consistent, thereby guaranteeing the power generation of the string.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of a portion of the structure of the photovoltaic module provided in this application; Figure 2 This is a schematic diagram of the coating on the panel provided in this application in one embodiment; Figure 3 This is a schematic diagram of the coating on the panel provided in this application in another embodiment; Figure 4 A schematic diagram of the panel coating provided in this application in another embodiment. Figure 5 This is a cross-sectional schematic diagram of a portion of the structure of the panel provided in this application.

[0017] Figure label: 100 - Photovoltaic modules; 10-panel; 101 - Visible Panel; 101a - Transparent area; 102 - Coating; 102a - Dot matrix pattern 20 - First adhesive layer; 30-battery string; 40 - Second adhesive layer; 50 - Backplate.

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0019] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0020] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0024] With the development of photovoltaic technology, photovoltaic module applications are becoming an important sub-sector of the photovoltaic technology field. Currently, the market demands both excellent photoelectric performance and attractive appearance with vibrant colors from photovoltaic modules. Therefore, the inherent contradiction between color performance and power generation efficiency constitutes the core challenge in the development of colored photovoltaic tiles. Traditional photovoltaic modules typically use dark colors, especially dark blue or black, to maximize light absorption efficiency, as these colors minimize light reflection and improve photoelectric conversion efficiency.

[0025] However, when photovoltaic modules need to be light-colored or other unconventional colors, some sunlight will inevitably be reflected rather than absorbed, directly affecting power generation efficiency. This efficiency loss is often unavoidable in the pursuit of architectural aesthetics. How to balance aesthetic needs and energy output has become the key to technological development.

[0026] Currently, colored photovoltaic tiles are typically produced using processes such as magnetron sputtering coating and screen printing of colored enamel.

[0027] For example, magnetron sputtering achieves color orientation. By precisely controlling the nanometer film thickness, magnetron sputtering induces optical interference, "weaving" a thin film structure on the glass surface that is both color-producing and light-transmitting, achieving a balance between the aesthetics and power generation efficiency of colored photovoltaic tiles. The film thickness is precisely controlled between 0.1μm and 0.5μm (equivalent to transmitting 1 / 4 to 1 times the wavelength of light). When light passes through film layers of different thicknesses, constructive and destructive interference occur, selectively reflecting specific wavelengths (such as 450nm blue light / 650nm red light), thus presenting different colors. By optimizing the film thickness and refractive index, non-reflective wavelengths of light can efficiently pass through the film layer (transmittance > 85%), ensuring sufficient light energy reaches the underlying photovoltaic cells and minimizing power generation losses (controllable to 10%-20%), resulting in uniform coating across the entire surface without dead corners.

[0028] Screen printing of dot arrays, with an array thickness of 10nm-50nm, offers significantly higher color concentration than magnetron sputtering, but also suffers from severe light-blocking. Only through dot array design, by creating light-transmitting zones between different color dots, can the power loss due to color be reduced to between 15% and 20%.

[0029] However, both of these methods involve uniformly setting the same color on the product, and there is still a significant conflict between the color appearance and the power generation.

[0030] Therefore, this application provides a photovoltaic module to solve the above-mentioned technical problems.

[0031] Figure 1This is a cross-sectional schematic diagram of a portion of the structure of a photovoltaic module 100. The photovoltaic module 100 includes a panel 10, a first adhesive layer 20, a battery string 30, a second adhesive layer 40, and a backsheet 50 stacked along its own thickness direction. The panel 10 and the battery string 30 are encapsulated and fixed together by the first adhesive layer 20, and the backsheet 50 and the battery string 30 are encapsulated and fixed together by the second adhesive layer 40.

[0032] Specifically, the panel 10 and backsheet 50 protect the internal encapsulation materials and the battery string 30 from mechanical damage and external environmental corrosion, and are waterproof and moisture-proof. During the lamination process of the photovoltaic module 100, the first adhesive layer 20 and the second adhesive layer 40 encapsulate the battery string 30, preventing the external environment from affecting the performance of the battery string 30, and also bonding the panel 10, battery string 30 and backsheet 50 into a whole.

[0033] The photovoltaic module 100 can consist of one or more battery strings 30. If there are multiple battery strings 30, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery strings 30 are connected in both series and parallel, which can provide higher voltage and capacity. One end of the busbar is connected to the battery string 30, and the other end is connected to the junction box to lead out the electrical energy generated by the photovoltaic module 100 and connect it to the external load.

[0034] The first adhesive layer 20 and the second adhesive layer 40 can be made of one of the following materials: ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), polyvinyl butyral (PVB), etc., or they can be EPE adhesive layer (EVA-POE-EVA co-extrusion structure) or EP adhesive layer (EVA-EP co-extrusion structure).

[0035] It is understandable that other layers may be provided between the panel 10 and the first adhesive layer 20, between the first adhesive layer 20 and the battery string 30, between the battery string 30 and the second adhesive layer 40, and between the second adhesive layer 40 and the back sheet 50. The specific number of layers of the photovoltaic module 100 can be set according to the actual situation, and this embodiment does not limit it.

[0036] In some embodiments, the photovoltaic module 100 further includes a coating 102 that, in a direction perpendicular to the panel 10, partially obscures the structure of the solar cells. The area obscured by the coating 102 varies in different regions of the same solar cell. For multiple solar cells located on the same cell string 30, the total area obscured by the coating 102 is the same.

[0037] In this embodiment, the coating 102 is a pattern applied to the photovoltaic module 100 to improve the aesthetics of the photovoltaic module 100 and make the photovoltaic module suitable for more building scenarios.

[0038] The design of coating 102 on photovoltaic modules is random, which makes the appearance of photovoltaic modules show a gradient, layering and semi-transparent effect, realizes the diversified design of photovoltaic modules, and makes the appearance of photovoltaic modules more design-oriented, closer to the texture and color of traditional tiles such as clay tiles and slate tiles.

[0039] Furthermore, while the design of the coating 102 on the photovoltaic module 100 is random, the design aims to ensure that the total area covered by the coating on each cell in the same cell string 30 is approximately the same. This prevents a single cell from being excessively shaded, resulting in a smaller light-transmitting area and reduced light reaching that cell, which in turn reduces the current generated by that cell. Consequently, the low current of that single cell in the series circuit will lead to a low current across the entire string (current limiting in series circuits). Therefore, it is essential to ensure that the area of ​​the cells in the same string shaded by the coating 102 is consistent to guarantee the power generation of the cell string 30.

[0040] Figure 2 This is a schematic diagram of a coating 102 on a photovoltaic module 100 in one embodiment. The coating 102 includes a plurality of discrete dot matrix patterns 102a. The dot matrix patterns 102a corresponding to the same solar cell have the same spacing but different sizes. Alternatively, the dot matrix patterns 102a corresponding to the same solar cell have the same size but different spacing. Or, the dot matrix patterns 102a corresponding to the same solar cell have different sizes and different spacing.

[0041] In other words, the dot matrix pattern 102a can be set randomly, and the depth of the coating 102 can be represented by multiple discrete dot matrix patterns 102a, so that the coating 102 can simulate the natural color of clay tile after firing.

[0042] To create a naturally transitional coating 102 texture on the photovoltaic module 100, the size and density variations of the dot matrix pattern 102a may be random. For details, please refer to [link / reference needed]. Figure 2 The depth variation of the coating 102 is represented by setting the dot matrix pattern 102a to have consistent spacing but inconsistent size.

[0043] Alternatively, please refer to Figure 3 , Figure 3 This is a schematic diagram of the coating 102 on the photovoltaic module 100 in another embodiment. The depth variation of the coating 102 is represented by setting the dot matrix pattern 102a to have the same size but different spacing.

[0044] Alternatively, the depth variation of the coating 102 can be represented by setting the dot matrix pattern 102a to have inconsistent sizes and spacing.

[0045] In other embodiments, the size and / or spacing of the plurality of dot matrix patterns 102a can be gradually adjusted along a preset direction. The specific settings can be determined according to actual conditions, and are not limited in this embodiment.

[0046] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the coating 102 on the photovoltaic module 100 in another embodiment. In this embodiment, the area of ​​the coating 102 that is blocked by different regions on the same cell string 30 is different. The specific amount can be set according to the actual situation, and this embodiment does not limit it.

[0047] Figure 5 This is a cross-sectional schematic diagram of a portion of the structure of panel 10. Panel 10 includes a visible panel 101, and a coating 102 can be disposed on one surface of the visible panel 101. The coating 102 is a pattern disposed on one side of panel 10 to improve the aesthetics of panel 10, thereby improving the aesthetics of photovoltaic module 100 and making photovoltaic module 100 suitable for more building scenarios.

[0048] The visible panel 101 can be a glass panel or a panel made of other materials. The specific design can be determined according to the actual situation, and this embodiment does not impose any limitations.

[0049] Specifically, please refer to the reference. Figure 1 and Figure 5 The coating 102 is disposed on the side of the panel 10 near the battery string 30. That is, after the photovoltaic module 100 is formed by laminating the panel 10, the first adhesive layer 20, the battery string 30, the second adhesive layer 40 and the back sheet 50, the coating 102 is disposed on the inner side of the photovoltaic module 100, reducing the risk of the coating 102 being discolored after being corroded on the outer surface of the photovoltaic module 100.

[0050] Alternatively, the coating 102 can also be disposed on the side of the panel 10 facing away from the battery string 30. That is, after the photovoltaic module 100 is formed by laminating the panel 10, the first adhesive layer 20, the battery string 30, the second adhesive layer 40, and the backsheet 50, the coating 102 is disposed on the outer side of the photovoltaic module 100. The specific details can be determined according to actual conditions, and this embodiment does not impose limitations. In some embodiments, the visible panel 101 includes a light-transmitting area 101a, which allows light to pass through without absorbing or reflecting light. The area of ​​the light-transmitting area 101a accounts for 50% of the area of ​​the surface where the coating 102 is located, ensuring both the aesthetic appearance of the panel 10 and its light transmittance.

[0051] For example, please continue to refer to Figure 3The dot matrix pattern 102a is circular, and the spacing between adjacent dot matrix patterns 102a is fixed at 0.2mm. The size of the dot matrix pattern 102a is adjusted to gradually change, with the maximum diameter of the circle in the dark area being 1.2mm, and the diameter gradually transitioning to 0.2mm from the dark area to the light area. The dark area accounts for 30% of the area, the light area accounts for 20%, and the light-transmitting area 101a accounts for 50%.

[0052] Alternatively, please continue to refer to Figure 5 The dot matrix pattern 102a is circular, with a fixed diameter of 0.8mm. The spacing between adjacent dot matrix patterns 102a in the dark area is 0.2mm, gradually adjusting to 0.6mm as the dark area transitions to the light area. The dark area accounts for 30% of the total area, the light area accounts for 20%, and the translucent area 101a accounts for 50%.

[0053] Alternatively, the dot matrix pattern 102a can be circular, with both its size and spacing changing simultaneously. From the dark area to the light area, the diameter of the dot matrix pattern 102a gradually decreases from 1.2mm to 0.2mm, while the spacing between adjacent dot matrix patterns 102a gradually increases from 0.2mm to 0.6mm. The dark area accounts for 30% of the total area, the light area accounts for 20%, and the translucent area 101a accounts for 50%.

[0054] Understandably, the dark area refers to: the area of ​​dot matrix pattern 102a / the area of ​​the dark area = 50%, the light area refers to: the area of ​​dot matrix pattern 102a / the area of ​​the dark area < 50%, and the transparent area refers to: the area of ​​dot matrix pattern 102a / the area of ​​the transparent area = 0.

[0055] The transparent area allows light to pass through, and people can see the colors inside the photovoltaic module 100 through the light-transmitting area 101a. In other words, the visual pattern presented by the photovoltaic module 100 includes the coating 102 of the panel 10 and the colors of the cell strings 30 that pass through the light-transmitting area 101a of the panel 10.

[0056] For example, the color of the solar cells is generally dark blue, dark black, etc., while the color of the coating 102 is reddish-brown, orange-yellow, off-white, etc. When the solar cells are dark black and the coating 102 is reddish-brown, the visual effect of the photovoltaic module 100 will be reddish-brown and dark black. The specific colors of the solar cells and the coating 102 on the panel 10 can be selected according to the desired color effect of the photovoltaic module 100, and this embodiment does not limit this.

[0057] In some embodiments, the coating 102 may be disposed on the side of the solar cell near the panel 10. That is, the coating 102 is a pattern disposed on the side of the solar cell near the panel 10. Since both the panel 10 and the first adhesive layer 20 are transparent materials, the photovoltaic module 100 presents the visual effect of the coating 102 on the solar cell.

[0058] In some embodiments, coating 102 may be disposed on the first adhesive layer 20. That is, coating 102 is a pattern disposed on the first adhesive layer 20, and the panel 10 is made of transparent material, so the visual effect presented by the photovoltaic module 100 is coating 102 on the first adhesive layer 20.

[0059] In some embodiments, the minimum spacing between adjacent dot matrix patterns 102a is H1, where H1 ≥ 0.1 mm.

[0060] For example, the spacing between adjacent dot matrix patterns 102a can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 0.12mm, 0.15mm, 0.18mm, 0.21mm, 0.24mm, 0.27mm, 0.30mm, etc., and can be set according to the actual situation. This embodiment does not limit it here.

[0061] This embodiment limits the spacing between adjacent dot matrix patterns 102a to more than 0.1mm, so that there is a certain area between adjacent dot matrix patterns 102a that can be used as a light-transmitting area, thereby improving the light transmittance of the panel 10 and improving the power generation efficiency of the photovoltaic module 100.

[0062] In some embodiments, the length of the dot matrix pattern 102a is L1, where 0.05mm ≤ L1 ≤ 2mm.

[0063] For example, the length of the dot matrix pattern 102a can be 0.05mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc., and can be set according to the actual situation. This embodiment does not limit it here.

[0064] In this embodiment, the length of the dot matrix pattern 102a should not be too large or too small. If the length of the dot matrix pattern 102a is too large (e.g., L1 is less than 0.05 mm), the size of the dot matrix pattern 102a will be too small, and the mesh openings for making the dot matrix pattern 102a will also be small. If the mesh openings are too small, ink will easily clog the mesh openings, affecting the forming pass rate of the dot matrix pattern 102a. If the length of the dot matrix pattern 102a is too large (e.g., L1 is greater than 2 mm), the size of the dot matrix pattern 102a will be too large, and the dot matrix pattern 102a will occupy a large area of ​​the panel 10, causing more obstruction to the battery string 30 and affecting the light transmittance of the panel 10.

[0065] The shape of the dot matrix pattern 102a includes, but is not limited to, one or more of the following: circle, ellipse, square, rhombus, triangle, polygon, trapezoid, and irregular shape. Alternatively, the dot matrix pattern 102a may also be selected from other shapes. The specific shape of the dot matrix pattern 102a can be set according to the actual situation, and this embodiment does not limit it.

[0066] Understandably, the length of the dot matrix pattern 102a can be the diameter of a circle, the side length of an ellipse, the side length of a rectangle or triangle, or the line connecting two corners of the figure.

[0067] This application embodiment also provides a method for manufacturing a panel 10, which is used to prepare the panel 10 described above. The manufacturing method includes: printing ink onto a visible panel 101 using a screen printing mold, transferring the ink through the mesh of the screen printing mold onto the visible panel 101 to form a discrete dot matrix pattern 102a, placing the visible panel 101 with ink into a tempering furnace for firing, and fixing the ink onto the visible panel 101 to form a coating 102.

[0068] In this embodiment, ink is transferred through the mesh of the screen mold to the visible plate 101 to form discrete dot matrix patterns 102a. The size of the dot matrix patterns 102a and the spacing between adjacent dot matrix patterns 102a are adjusted by adjusting the size of the mesh and the spacing between adjacent meshes, thereby adjusting the color depth of the coating 102.

[0069] The methods for simulating color variations in coating 102 by adjusting the size of multiple dot matrix patterns 102a and adjusting the spacing between multiple dot matrix patterns 102a can be found above and will not be repeated in this embodiment.

[0070] Similarly, the adjustment of the mesh size and the adjustment of the spacing between adjacent meshes can refer to the above-mentioned adjustment of the size of multiple dot matrix patterns 102a to simulate the color depth of the coating 102, and adjustment of the spacing between multiple dot matrix patterns 102a to simulate the color depth of the coating 102. This embodiment will not repeat the details here.

[0071] In this embodiment, the coating 102 is composed of multiple discrete dot matrix patterns 102a, such that the area between the dot matrix patterns 102a is a light-transmitting area 101a. This not only ensures the overall aesthetics of the panel 10, but also ensures that the panel 10 has a high light transmittance, ensuring that the photovoltaic module 100 has a high power generation capacity and reducing power generation efficiency loss.

[0072] In some embodiments, before printing ink onto the visible panel 101, the visible panel 101 may be treated with an oleophilic treatment agent to improve the adhesion between the ink and the visible panel 101.

[0073] In some embodiments, the manufacturing method further includes placing the ink-coated visual panel 101 in a tempering furnace for firing at a firing temperature of 600°C-800°C.

[0074] In this embodiment, the visible panel 101 can be made of glass. After the ink is printed onto the visible panel 101, both are placed together in a tempering furnace for firing. The tempered glass surface develops uniform compressive stress, while the interior develops tensile stress, significantly increasing the surface strength and effectively improving the glass's bending and impact resistance, achieving a strength four times that of ordinary glass. When broken, it shatters into uniform, unbroken small particles that are unlikely to cause injury, classifying it as safety glass.

[0075] High-temperature ink can be used. After firing, the ink and glass are fused together (silicon dioxide), so that the ink is cured on the visible panel 101 to form a coating 102. The coating 102 is hard and has good heat resistance.

[0076] In other embodiments, the visible panel 101 may also be made of other transparent materials. The specific choice can be made according to the actual situation, and this embodiment does not limit it.

[0077] In some embodiments, the minimum spacing between adjacent meshes is H2, where H2 ≥ 0.1 mm.

[0078] For example, the spacing between adjacent meshes can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 0.12mm, 0.15mm, 0.18mm, 0.21mm, 0.24mm, 0.27mm, 0.30mm, etc., and can be set according to the actual situation. This embodiment does not limit it here.

[0079] This embodiment limits the spacing between adjacent meshes to be greater than 0.1 mm and the spacing between adjacent dot matrix patterns 102a to be greater than 0.1 mm, so that there is a certain area between adjacent dot matrix patterns 102a that can serve as a light-transmitting area 101a, thereby improving the light transmittance of the panel 10 and increasing the power generation efficiency of the photovoltaic module 100.

[0080] In some embodiments, the length of the mesh is L2, where 0.05mm ≤ L2 ≤ 2mm.

[0081] For example, the length of the mesh can be 0.05mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc., and can be set according to the actual situation. This embodiment does not limit it here.

[0082] In this embodiment, the length of the mesh opening should not be too large or too small. If the mesh opening length is too large (e.g., L2 is less than 0.05 mm), the mesh size will be too small, which may cause the ink to clog the mesh opening and affect the forming qualification rate of the dot matrix pattern 102a. If the mesh opening length is too large (e.g., L2 is greater than 2 mm), the size of the dot matrix pattern 102a formed by the ink through the mesh opening will be too large, resulting in the dot matrix pattern 102a occupying a large area of ​​the panel 10, which will block more of the battery string 30 and affect the light transmittance of the panel 10.

[0083] In some embodiments, the shape of the mesh includes, but is not limited to, one or more of the following: circular, square, rhomboid, triangular, polygonal, and trapezoidal. Alternatively, other shapes may be used for the mesh, and the specific shape of the mesh can be set according to the actual situation, which is not limited in this embodiment.

[0084] Understandably, the length of the mesh can be the diameter of a circle, the side length of an ellipse, the side length of a rectangle or triangle, or the line connecting two corners of a shape.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module (100) includes a panel (10), a first adhesive layer (20), a battery string (30), a second adhesive layer (40), and a backsheet (50) stacked together. Each battery string includes multiple battery cells connected in series. The photovoltaic module (100) also includes a coating (102). In a direction perpendicular to the panel (10), the coating (102) covers part of the structure of the battery cell. The area covered by the coating (102) is different in different areas of the same battery cell. The total area covered by the coating (102) is the same for multiple battery cells located on the same battery string (30).

2. The photovoltaic module according to claim 1, characterized in that, The coating (102) is disposed on the panel (10). The coating (102) includes a plurality of discrete dot matrix patterns (102a). The spacing of the dot matrix patterns (102a) corresponding to the same battery cell is consistent but the size is inconsistent; or, the size of the dot matrix patterns (102a) corresponding to the same battery cell is consistent but the spacing is inconsistent; or, the size of the dot matrix patterns (102a) corresponding to the same battery cell is inconsistent and the spacing is inconsistent.

3. The photovoltaic module according to claim 2, characterized in that, The minimum spacing between adjacent dot matrix patterns (102a) is H1, where H1 ≥ 0.1 mm.

4. The photovoltaic module according to claim 2, characterized in that, The length of the dot matrix pattern (102a) is L1, where 0.05mm≤L1≤2mm.

5. The photovoltaic module according to any one of claims 2 to 4, characterized in that, The shape of the dot matrix pattern (102a) includes one or more of the following: circle, square, rhombus, triangle, polygon, and trapezoid.

6. The photovoltaic module according to claim 1, characterized in that, The coating (102) is disposed on the side of the panel (10) near the battery string (30).

7. The photovoltaic module according to claim 1, characterized in that, The coating (102) is disposed on the side of the battery cell near the panel (10).

8. The photovoltaic module according to claim 1, characterized in that, The coating (102) is disposed on the first adhesive layer (20).

Images