Photovoltaic module and photovoltaic system

Abstract

A photovoltaic module and a photovoltaic system. The photovoltaic module includes a panel, a back plate, a cell sheet layer, and a first encapsulation adhesive film layer, wherein the back plate and the panel are stacked, the cell sheet layer is located between the panel and the back plate, the first encapsulation adhesive film layer is located between the cell sheet layer and the panel, a color layer is provided between the panel and the first encapsulation adhesive film layer, the color layer is a light-transmitting layer, and a relief structure is provided on the side of the panel facing away from the first encapsulation adhesive film layer. The relief structure can reduce the reflection of sunlight on the panel, thereby increasing the incident amount of sunlight and increasing the power generation of solar energy.

Description

Photovoltaic modules and photovoltaic systems

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 202422683473.8, filed with the China National Intellectual Property Administration on November 4, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module and a photovoltaic system. Background Technology

[0004] With the increasing prominence of severe problems such as energy shortages and climate emissions, countries around the world are paying more and more attention to clean, pollution-free renewable energy sources. Solar energy is an inexhaustible and green energy source. Currently, photovoltaic power generation has a wide range of applications, and building-integrated photovoltaics (BIPV) is gradually becoming a trend, with residential rooftops being the main application area for distributed photovoltaics. The inventors realized that photovoltaic modules have high reflectivity, which can cause significant light pollution, and that photovoltaic modules are also aesthetically unappealing. Summary of the Invention

[0005] This application provides a photovoltaic module and a photovoltaic system.

[0006] The photovoltaic module of this application includes a panel, a backsheet, a cell layer, and a first encapsulating film layer. The backsheet and the panel are stacked together, the cell layer is located between the panel and the backsheet, the first encapsulating film layer is located between the cell layer and the panel, a color layer is provided between the panel and the first encapsulating film layer, the color layer is a light-transmitting layer, and the side of the panel away from the first encapsulating film layer has a concave-convex structure.

[0007] The photovoltaic system of this application includes a support device and photovoltaic modules. The photovoltaic modules are mounted on the support device, and at least two photovoltaic modules are connected to each other. Each photovoltaic module includes a panel, a backsheet, a cell layer, and a first encapsulating film layer. The backsheet and the panel are stacked together. The cell layer is located between the panel and the backsheet. The first encapsulating film layer is located between the cell layer and the panel. A color layer, which is a light-transmitting layer, is provided between the panel and the first encapsulating film layer. The side of the panel facing away from the first encapsulating film layer has a textured structure.

[0008] In the photovoltaic module and photovoltaic system of this application, the concave-convex structure can reduce the reflection of sunlight on the panel, thereby increasing the amount of sunlight incident, increasing the power generation of solar energy, and reducing building light pollution. In addition, the color layer can increase the color brightness of the panel, thereby improving the aesthetics of the photovoltaic module.

[0009] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0011] Figure 1 is a perspective view of a photovoltaic module according to an embodiment of this application;

[0012] Figure 2 is a structural schematic diagram of a photovoltaic module according to an embodiment of this application;

[0013] Figure 3 is a structural schematic diagram of the photovoltaic module according to the embodiment of this application when the front side is facing up;

[0014] Figure 4 is a schematic diagram of the structure of the photovoltaic module according to the embodiment of this application with the back side facing up;

[0015] Figure 5 is a side view of a photovoltaic module according to an embodiment of this application;

[0016] Figure 6 is a partial schematic diagram of the solder strip in an embodiment of this application;

[0017] Figure 7 is a three-dimensional schematic diagram of a photovoltaic system according to an embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 1000, photovoltaic system; 100, photovoltaic module; 10, panel; 20, backsheet; 30, cell layer; 31, cell string; 32, cell; 33, solder strip; 34, first soldering section; 35, second soldering section; 36, stacked area; 40, first encapsulating film layer; 50, colored layer; 60, uneven structure; 70, second encapsulating film layer; 300, supporting component. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these 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.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. 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 indicated technical features. Thus, features defined with "first" and "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.

[0021] 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.

[0022] 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.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, 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.

[0024] Please refer to Figures 1 and 2. The photovoltaic module 100 of this application embodiment includes a panel 10, a back sheet 20, a cell layer 30, and a first encapsulating film layer 40. The back sheet 20 and the panel 10 are stacked. The cell layer 30 is located between the panel 10 and the back sheet 20. The first encapsulating film layer 40 is located between the cell layer 30 and the panel 10. A color layer 50 is provided between the panel 10 and the first encapsulating film layer 40. The color layer 50 is a light-transmitting layer. The side of the panel 10 away from the first encapsulating film layer 40 is provided with a concave-convex structure 60.

[0025] Thus, the concave-convex structure 60 can reduce the reflection of sunlight on the panel 10, thereby increasing the amount of sunlight incident, increasing the power generation of solar energy, and reducing building light pollution. In addition, the color layer 50 can increase the color brightness of the panel 10, thereby improving the aesthetics of the photovoltaic module 100.

[0026] Specifically, a photovoltaic module 100 refers to a smallest indivisible photovoltaic cell assembly that is encapsulated and internally connected, capable of providing DC power output independently. It is a device that converts light energy into electrical energy. Many materials can produce the photovoltaic effect, such as monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, and copper indium selenide. When light shines on the surface of the photovoltaic module 100, some photons are absorbed by the silicon material. The energy of the photons is transferred to silicon atoms, causing electrons to transition and become free electrons that accumulate on both sides of the PN junction, thus forming a potential difference. When an external circuit is connected, under the influence of this voltage, current will flow through the external circuit, generating a certain output power.

[0027] The solar cell layer 30 can receive light and convert solar energy into electrical energy. The front panel 10 is located on the front of the solar cell layer 30, and the back panel 20 is located on the back of the solar cell layer 30. The front of the solar cell layer 30 refers to the main light-receiving surface of the solar cell layer 30, and the back is the surface opposite to the front of the solar cell layer 30.

[0028] The panel 10 and backsheet 20 constitute the outermost layer of the photovoltaic module 100, serving to seal, insulate, and protect the cell layer 30, thereby improving the mechanical properties of the photovoltaic module 100. The panel 10 and backsheet 20 protect the cell layer 30 from damage caused by climate changes, such as high temperatures, low temperatures, rain, or hail. They also protect the cell layer 30 from damage during transportation due to collisions, effectively improving the photovoltaic module 100's ability to withstand harsh environments.

[0029] A colored layer 50 can be formed on the surface of the panel 10 near the first encapsulating film layer 40 using various processes such as coating, screen printing, and digital printing. The uneven structure 60 can be an irregular or regular uneven structure. The battery cell layer 30 and the panel 10 can be connected and fixed by the first encapsulating film layer 40, achieving lamination and encapsulation of the battery cell layer 30 and the panel 10 to form a stable and reliable structure. In addition, the first encapsulating film layer 40 can act as a buffer between the panel 10 and the battery cell layer 30 to prevent breakage due to lamination. The first encapsulating film layer 40 can be made of one of EVA, POE, or EPE materials.

[0030] In some embodiments, the uneven structure 60 is a frosted uneven structure 60.

[0031] The frosted textured structure 60 creates a finely textured surface on the panel 10, further increasing the amount of sunlight entering the building, increasing solar power generation, reducing sunlight reflection, and reducing light pollution.

[0032] Specifically, a frosted textured structure 60 can be formed on the surface of panel 10 away from the first encapsulating film layer 40 through a frosting process.

[0033] In some embodiments, the light transmittance of panel 10 is greater than that of color layer 50.

[0034] In this way, sunlight can pass through the panel 10 and reach the color layer 50, and the color layer 50 can receive the light from the panel 10 normally, reducing the impact on the power generation effect of the battery cell layer 30.

[0035] Specifically, panel 10 can be made of a light-transmitting material, such as glass or polycarbonate. When the light transmittance of color layer 50 is 80%, the light transmittance of panel 10 can be 85%, 90%, 95%, etc.

[0036] In some embodiments, panel 10 is one of PET board, CPC board and HPC board.

[0037] This design ensures that panel 10 has good light transmittance, allowing the color layer 50 to properly receive light from panel 10. Furthermore, panel 10 is made of a flexible polymer material, which reduces its weight and allows it to be bent into different shapes to suit various design requirements. Additionally, the choice of the battery cell layer 30 can improve power generation efficiency.

[0038] Specifically, panel 10 can be flat or curved. Panel 10 can be made from purchased finished panel materials, which can be cut into suitable shapes and sizes using an offline cutting machine in the workshop, and the cut-off materials can be collected for later use.

[0039] In some embodiments, the light transmittance of the back panel 20 is less than that of the color layer 50.

[0040] In this way, the transmittance of sunlight from the back panel 20 to the color layer 50 can be reduced, thereby improving the utilization rate of sunlight.

[0041] Specifically, the backplate 20 can be a dark-colored backplate 20, such as a black backplate 20. The backplate 20 can be entirely black, or only the side of the backplate 20 facing the cell layer 30 can be black. When the light transmittance of the color layer 50 is 80%, the light transmittance of the backplate 20 can be 65%, 70%, 75%, etc.

[0042] In some embodiments, the thickness of the panel 10 is 0.18 mm to 0.3 mm; and / or, the thickness of the back panel 20 is 0.18 mm to 0.4 mm.

[0043] Thus, by limiting the thickness of the panel 10 and the back plate 20 to the above-mentioned range, the strength of the panel 10 and the back plate 20 can meet the requirements, and the strength of the panel 10 and the back plate 20 can meet the protection requirements for the battery cell layer 30.

[0044] Specifically, the thickness of panel 10 can be any point value between 0.18mm and 0.3mm, or a range between any two. For example, the thickness of panel 10 is 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, or 0.3mm.

[0045] The thickness of the backplate 20 can be any point value or a range between 0.18mm and 0.4mm. For example, the thickness of the backplate 20 is 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, or 0.4mm.

[0046] The thickness of the front panel 10 and the back panel 20 can be the same or different. For example, the thickness of both the front panel 10 and the back panel 20 can be 0.24 mm, or the thickness of the front panel 10 can be 0.27 mm and the thickness of the back panel 20 can be 0.32 mm.

[0047] Please refer to Figures 3 and 4. In some embodiments, the cell layer 30 includes a plurality of cell strings 31 connected in series, each cell string 31 including a plurality of cell sheets 32, and all the cell sheets 32 in each cell string 31 are connected in series by solder ribbons 33.

[0048] In this way, connecting multiple solar cells 32 in series can improve the efficiency of the solar cell layer 30, thereby increasing the utilization rate of solar energy.

[0049] Specifically, the solar cell 32 is preferably one of the following: XBC, MWT, or shingled solar cells without metal grid lines, where both positive and negative metal electrodes are led out from the back side. A secondary preference is a solar cell 32 with grid lines on both the front and back sides, such as PERC, TOPCON, or HJT. This maintains the consistency of the appearance of the solar cell layer 30, preventing metal grid lines and metal electrodes from affecting the front appearance of the solar cell layer 30, thereby improving aesthetics.

[0050] Multiple solar cells 32 connected in series can be multiple complete solar cells 32 connected in series, multiple 1 / 2 solar cells 32 connected in series, multiple 1 / 3 solar cells 32 connected in series, or multiple 1 / 4 solar cells 32 connected in series.

[0051] In one embodiment, the cell layer 30 includes three cell strings 31 connected in series, each cell string 31 consisting of 12 half-cell cells 32 connected in series, and the power range of the cell layer 30 is between 100W and 110W.

[0052] In another embodiment, the battery cell layer 30 includes 6 battery strings 31, 3 battery strings 31 are connected in series to form a battery string 31 group, each battery string 31 consists of 12 half battery cells 32 connected in series, and 2 battery string 31 groups are connected in parallel. The power range of the battery cell layer 30 is between 200W and 210W.

[0053] The solder ribbon 33 is used to electrically connect multiple solar cells 32. The solder ribbon 33 can be made of conductive materials such as silver, tin, or alloys to improve its conductivity. The multiple solar cells 32 can be arranged in a flat or stacked manner.

[0054] Referring to Figures 5 and 6, in some embodiments, the solder strip 33 includes a plurality of first solder segments 34 and at least one second solder segment 35. The first solder segment 34 is connected to a corresponding battery cell 32. The second solder segment 35 connects two adjacent first solder segments 34 along a first direction D1. The second solder segment 35 is located between two adjacent battery cells 32 and spans the stacked region 36 of the two adjacent battery cells 32. The second solder segment 35 is flat.

[0055] Thus, the second welding segment 35 is located between two adjacent battery cells 32 and spans the stacked area 36 of the two adjacent battery cells 32. The second welding segment 35 is flat, which increases the contact area between the second welding segment 35 and the battery cell 32, reduces the pressure on the battery cell 32, and thus reduces defects such as cracks in the battery cell 32.

[0056] Specifically, the first welding segment 34 of the welding strip 33 can be welded to the battery cell 32, and the number of the second welding segments 35 is one less than the number of the first welding segments 34. For example, when there are two first welding segments 34, there is one second welding segment 35. The first welding segment 34 and the second welding segment 35 can be an integral structure.

[0057] The stacked region 36 of two adjacent battery cells 32 refers to the region where two adjacent battery cells 32 have overlapping areas. The second welding segment 35 spans the stacked region 36, meaning that the ends of the second welding segment 35 along the first direction D1 extend beyond the stacked region 36. The second welding segment 35 is flat, meaning that the width of the second welding segment 35 is greater than the height of the second welding segment 35.

[0058] It should be noted that the surface with the largest area of ​​the second welding section 35 faces or contacts the battery cell 32. The first direction D1 can be the direction in which all the battery cells 32 in each battery string 31 are arranged in series.

[0059] Referring to Figure 2, in some embodiments, the photovoltaic module 100 includes a second encapsulating film layer 70, which is located between the cell layer 30 and the backsheet 20.

[0060] Thus, the backsheet 20 and the cell layer 30 can be connected and fixed together by the second encapsulating film layer 70, achieving lamination encapsulation of the backsheet 20 and the cell layer 30 to form a stable and reliable structure. In addition, the second encapsulating film layer 70 can act as a buffer between the backsheet 20 and the cell layer 30, preventing cell breakage during lamination. The second encapsulating film layer 70 is made of one of EVA, POE, or EPE materials. The materials of the first encapsulating film layer 40 and the second encapsulating film layer 70 can be the same or different.

[0061] In some embodiments, the thickness of the first encapsulating film layer 40 and / or the second encapsulating film layer 70 is 0.3 mm to 0.7 mm.

[0062] When the thickness of the first encapsulating film layer 40 and / or the second encapsulating film layer 70 is too thin, reliable bonding between the panel 10 and the cell layer 30, and between the backsheet 20 and the cell layer 30, cannot be achieved. When the thickness of the first encapsulating film layer 40 and / or the second encapsulating film layer 70 is too thick, it will affect the performance of the photovoltaic module 100. By limiting the thickness of the first encapsulating film layer 40 and / or the second encapsulating film layer 70 within the aforementioned range, reliable bonding between the panel 10 and the cell layer 30, and between the backsheet 20 and the cell layer 30, is achieved while ensuring the performance of the photovoltaic module 100.

[0063] Specifically, the thickness of the first encapsulating film layer 40 and / or the second encapsulating film layer 70 can be any value between 0.3mm and 0.7mm, or a range between the two. For example, the thickness of the first encapsulating film layer 40 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, etc., and the thickness of the second encapsulating film layer 70 can be 0.35mm, 0.45mm, 0.55mm, 0.65mm, etc. The thickness of the first encapsulating film layer 40 and the thickness of the second encapsulating film layer 70 can be the same or different.

[0064] Please refer to Figure 7. The photovoltaic system 1000 is a photovoltaic product capable of generating electricity using solar energy, while also providing functions such as shading, heat insulation, and rain protection. The photovoltaic system 1000 can be applied to outdoor public areas, the perimeter of large commercial facilities, or private residences. For example, the photovoltaic system 1000 can be installed on a roof. This application uses a rooftop photovoltaic system 1000 as an example for illustration. The photovoltaic system 1000 includes a support component 300 and a photovoltaic module 100, with the photovoltaic module 100 mounted on the support component 300.

[0065] The support component 300 is a structure in the photovoltaic system 1000 that provides installation and support for the photovoltaic modules 100. The support component 300 can be made of metallic and / or non-metallic materials. Metallic materials include, but are not limited to, aluminum, iron, steel, or aluminum alloys, while non-metallic materials include, but are not limited to, plastics. For example, the support component 300 can be made of metallic materials, such as aluminum alloy, which improves the structural strength of the support component 300, enhances the photovoltaic system 1000's ability to withstand external environmental conditions (e.g., wind, rain, snow), and ensures the stability and reliability of the photovoltaic system 1000's operation. It should be noted that in some embodiments, the overall shape of the support component 300 can be, but is not limited to, square, cylindrical, and rhomboid shapes. This allows the support component 300 to adapt to the installation of photovoltaic modules 100 of different sizes and shapes. For example, the support component 300 can be a roof purlin or a purlin-less roof structure, and the photovoltaic modules 100 can be directly or indirectly installed on the support component 300 via mounting components.

[0066] The photovoltaic module 100 is mounted on the support component 300. On one hand, it absorbs sunlight and converts solar energy into electrical energy for power generation. On the other hand, it covers the support component 300, reducing sunlight penetration into the photovoltaic system 1000 and providing a shading effect. The interior of the photovoltaic system 1000 refers to the space below the photovoltaic module 100 and enclosed by the support component 300. In some embodiments, the photovoltaic module 100 can be detachably installed on the support component 300, facilitating its removal for maintenance or replacement. Detachable connections include, but are not limited to, bolted connections and snap-fit ​​connections. In other embodiments, the photovoltaic module 100 can be non-detachably installed on the support component 300. This increases the bonding strength between the photovoltaic module 100 and the support component 300, enhancing the photovoltaic system 1000's resistance to external environmental factors and ensuring its stability and reliability. Non-detachable connections include, but are not limited to, bonding or welding.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, 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 embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: panel; The back panel is stacked on top of the front panel. A battery cell layer, wherein the battery cell layer is located between the panel and the back panel; and A first encapsulating film layer is located between the battery cell layer and the panel. A colored layer is provided between the panel and the first encapsulating film layer. The colored layer is a light-transmitting layer. The side of the panel opposite to the first encapsulating film layer has a concave-convex structure.

2. The photovoltaic module according to claim 1, characterized in that, The convex-concave structure is a frosted convex-concave structure.

3. The photovoltaic module according to any one of claims 1-2, characterized in that, The light transmittance of the panel is greater than that of the color layer.

4. The photovoltaic module according to any one of claims 1-3, characterized in that, The panel is one of PET board, CPC board and HPC board.

5. The photovoltaic module according to claim 1, characterized in that, The light transmittance of the back panel is less than that of the color layer.

6. The photovoltaic module according to claim 1, characterized in that, The thickness of the panel is 0.18mm-0.3mm; and / or the thickness of the back panel is 0.18mm-0.4mm.

7. The photovoltaic module according to any one of claims 1-6, characterized in that, The battery cell layer includes multiple battery strings connected in series, each battery string includes multiple battery cells, and all the battery cells in each battery string are connected in series by solder ribbons.

8. The photovoltaic module according to claim 7, characterized in that, The welding strip includes a plurality of first welding segments and at least one second welding segment. The first welding segment is connected to a corresponding one of the battery cells. The second welding segment connects two adjacent first welding segments along a first direction. The second welding segment is located between two adjacent battery cells and spans the stacked area of ​​the two adjacent battery cells. The second welding segment is flat.

9. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module includes a second encapsulating film layer, which is located between the cell layer and the backsheet.

10. The photovoltaic module according to claim 9, characterized in that, The thickness of the first encapsulating film layer and / or the second encapsulating film layer is 0.3mm-0.7mm.

11. A photovoltaic system, characterized in that, include: Support device; and A photovoltaic module, wherein the photovoltaic module is mounted on the support device, and the photovoltaic module comprises at least two photovoltaic modules connected to each other; The photovoltaic module includes a panel, a backsheet, a cell layer, and a first encapsulating film layer. The backsheet and the panel are stacked together. The cell layer is located between the panel and the backsheet. The first encapsulating film layer is located between the cell layer and the panel. A color layer is provided between the panel and the first encapsulating film layer. The color layer is a light-transmitting layer. The side of the panel away from the first encapsulating film layer has a concave-convex structure.

12. The photovoltaic system according to claim 11, characterized in that, The convex-concave structure is a frosted convex-concave structure.

13. The photovoltaic system according to any one of claims 11-12, characterized in that, The light transmittance of the panel is greater than that of the color layer.

14. The photovoltaic system according to any one of claims 11-12, characterized in that, The panel is one of PET board, CPC board and HPC board.

15. The photovoltaic system according to claim 11, characterized in that, The light transmittance of the back panel is less than that of the color layer.

16. The photovoltaic system according to any one of claims 11-15, characterized in that, The thickness of the panel is 0.18mm-0.3mm; and / or the thickness of the back panel is 0.18mm-0.4mm.

17. The photovoltaic system according to any one of claims 11-16, characterized in that, The battery cell layer includes multiple battery strings connected in series, each battery string includes multiple battery cells, and all the battery cells in each battery string are connected in series by solder ribbons.

18. The photovoltaic system according to claim 17, characterized in that, The welding strip includes a plurality of first welding segments and at least one second welding segment. The first welding segment is connected to a corresponding one of the battery cells. The second welding segment connects two adjacent first welding segments along a first direction. The second welding segment is located between two adjacent battery cells and spans the stacked area of ​​the two adjacent battery cells. The second welding segment is flat.

19. The photovoltaic system according to claim 11, characterized in that, The photovoltaic module includes a second encapsulating film layer, which is located between the cell layer and the backsheet.

20. The photovoltaic system according to claim 19, characterized in that, The thickness of the first encapsulating film layer and / or the second encapsulating film layer is 0.3mm-0.7mm.

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