Curved-surface photovoltaic tile and photovoltaic module
By employing a welding strip design in photovoltaic tiles, the second welding segment spans the cell stacking area in a flat shape, solving the problem of cracks at the cell stacking location and improving the photoelectric conversion efficiency and reliability of photovoltaic tiles.
Patent Information
- Application Number
- CN202422520290.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-10-17
AI Technical Summary
During the manufacturing process of photovoltaic tiles, defects such as cracks can easily occur at the stacked positions of adjacent solar cells due to pressure, affecting the photoelectric conversion efficiency and reliability of the photovoltaic tiles.
The design employs a welding strip, comprising multiple first welding segments and at least one second welding segment. The second welding segment is located between adjacent cells and spans the stacked area, and is flat in shape to increase the contact area and reduce the pressure on the cells.
It effectively reduces cracks and defects in solar cells, improves the photoelectric conversion efficiency and reliability of photovoltaic tiles, and increases the light-receiving area.
Smart Images
Figure CN223626243U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and more specifically, to a curved photovoltaic tile and a photovoltaic module. Background Technology
[0002] Photovoltaic tiles are devices that convert solar energy into light energy. To increase the light-receiving area of photovoltaic tiles and thus improve their photoelectric conversion efficiency, adjacent solar cells are partially stacked. However, during the manufacturing process of the multi-layered structure of photovoltaic tiles through pressing, defects such as cracks may occur at the stacked positions of adjacent solar cells under pressure. Utility Model Content
[0003] This utility model provides a curved photovoltaic tile and a photovoltaic module.
[0004] The curved photovoltaic tile of this application includes multiple solar cells and a welding strip. Along a first direction, two adjacent solar cells are partially stacked. The welding strip connects two adjacent solar cells and includes multiple first welding segments and at least one second welding segment. The first welding segment is connected to a corresponding solar cell, and the second welding segment connects two adjacent first welding segments along the first direction. The second welding segment is located between two adjacent solar cells and spans the stacked area of the two adjacent solar cells. The second welding segment is flat.
[0005] In the curved photovoltaic tile of this application embodiment, the welding strip can realize the electrical connection of multiple solar cells. The second welding segment is located between two adjacent solar cells and spans the stacked area of the two adjacent solar cells. The second welding segment is flat, which increases the contact area between the second welding segment and the solar cell, reduces the pressure on the solar cell, and thus reduces defects such as cracks in the solar cell.
[0006] In some embodiments, the battery cell includes a first surface and a second surface facing away from each other, wherein in two adjacent battery cells, the first surface of one battery cell is provided with the first weld section, and the second surface of the other battery cell is provided with the first weld section.
[0007] In some embodiments, the width of the first welded segment is W1, and the width of the second welded segment is W2, wherein 2≤W2 / W1≤3.
[0008] In some embodiments, the height of the first welded segment is H1, and the height of the second welded segment is H2, wherein 2≤H1 / H2≤5.
[0009] In some embodiments, the width of the second welded segment is W2, and the height of the second welded segment is H2, wherein 3 ≤ W2 / H2 ≤ 14.
[0010] In some embodiments, the first welded segment has a circular cross-section.
[0011] In some embodiments, the width of the first welded segment is W1, 0.18 mm ≤ W1 ≤ 0.26 mm; and / or,
[0012] The width of the second welded segment is W2, 0.3mm ≤ W2 ≤ 0.7mm; and / or,
[0013] The height of the first welded segment is H1, 0.18mm ≤ H1 ≤ 0.26mm; and / or,
[0014] The height of the second welded section is H2, where 0.05mm ≤ H2 ≤ 0.09mm.
[0015] In some embodiments, two adjacent solar cells are connected by a plurality of solder strips along a first direction, and the plurality of solder strips are spaced apart along a second direction, which intersects the first direction.
[0016] In some embodiments, the curved photovoltaic tile further includes a back sheet and a panel stacked with the back sheet, with the solar cells disposed between the back sheet and the panel.
[0017] The photovoltaic module of this application includes a plurality of curved photovoltaic tiles as described above, and the plurality of curved photovoltaic tiles are electrically connected.
[0018] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description
[0019] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0020] Figure 1 This is a three-dimensional schematic diagram of the curved photovoltaic tile according to an embodiment of the present invention;
[0021] Figure 2 This is a partial structural schematic diagram of the curved photovoltaic tile according to an embodiment of the present invention;
[0022] Figure 3 This is a side view of the curved photovoltaic tile according to an embodiment of the present invention;
[0023] Figure 4This is a partial schematic diagram of the welding strip according to an embodiment of the present invention.
[0024] Explanation of reference numerals in the attached figures:
[0025] 100 - Curved photovoltaic tile; 10 - Solar cell; 11 - Stacked area; 12 - First surface; 13 - Second surface; 20 - Welding strip; 21 - First welding section; 22 - Second welding section; 30 - Back sheet; 40 - Panel; D1 - First direction; D2 - Second direction. Detailed Implementation
[0026] The embodiments of this utility model 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 utility model, and should not be construed as limiting this utility model.
[0027] In this invention, unless otherwise explicitly 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 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 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 many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and settings are described below. These are merely examples and are not intended to limit the scope of the invention. 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 settings discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0029] In related technologies, photovoltaic tiles consist of solar cells and solder ribbons, which connect the solar cells in series. To increase the light-receiving area of the photovoltaic tile and improve its photoelectric conversion efficiency, adjacent solar cells are partially stacked, with the solder ribbon passing through the stacked area between the two cells. Since photovoltaic tiles are generally multi-layered, and these multi-layered structures need to be joined together by pressing, during the manufacturing process, the pressure exerted on the solder ribbon and solar cells can cause defects such as cracks at the stacked position of adjacent solar cells.
[0030] Please see Figures 1-4 The curved photovoltaic tile 100 of this application includes a plurality of solar cells 10 and a welding strip 20. Along the first direction D1, two adjacent solar cells 10 are partially stacked. The welding strip 20 connects two adjacent solar cells 10. The welding strip 20 includes a plurality of first welding segments 21 and at least one second welding segment 22. The first welding segment 21 is connected to a corresponding solar cell 10. The second welding segment 22 connects two adjacent first welding segments 21 along the first direction D1. The second welding segment 22 is located between two adjacent solar cells 10 and spans the stacked area 11 of the two adjacent solar cells 10. The second welding segment 22 is flat.
[0031] In the curved photovoltaic tile 100 of this application embodiment, the welding strip 20 can realize the electrical connection of multiple solar cells 10. The second welding segment 22 is located between two adjacent solar cells 10 and spans the stacked area 11 of the two adjacent solar cells 10. The second welding segment 22 is flat, which increases the contact area between the second welding segment 22 and the solar cell 10, reduces the pressure on the solar cell 10, and thus reduces defects such as cracks in the solar cell 10.
[0032] Specifically, the curved photovoltaic tile 100 is a photovoltaic product with a curved outer surface. The curved photovoltaic tile 100 has a larger light-receiving area and is less prone to water accumulation, making it suitable for rooftops, outdoor flat ground, and other applications. The solar cell 10 converts light energy into electrical energy. The solar cell 10 can be manufactured using Perc (Passivated Emitter Rear Cell) technology or Topcon (Tunnel Oxide Passivated Contact) technology. The solar cell 10 can be curved after pressing.
[0033] Multiple solar cells 10 can be arranged in a flat, laid-out manner. Adjacent solar cells 10 are partially stacked, meaning that adjacent solar cells 10 have overlapping areas in the thickness direction. The number of solar cells 10 can be set according to specific needs, such as 2, 3, 10, 50, etc.
[0034] The solder ribbon 20 is used to electrically connect multiple solar cells 10. The solder ribbon 20 can be made of conductive materials such as silver, tin, or alloys to improve its conductivity. The first welding segment 21 of the solder ribbon 20 can be welded to the solar cell 10. The number of second welding segments 22 is one less than the number of first welding segments 21. For example, when there are two first welding segments 21, there is one second welding segment 22. The first welding segment 21 and the second welding segment 22 can be an integral structure.
[0035] The stacked region 11 of two adjacent battery cells 10 refers to the region where two adjacent battery cells 10 have overlapping areas. The second welding segment 22 spans the stacked region 11, meaning that the ends of the second welding segment 22 along the first direction D1 extend beyond the stacked region 11. The second welding segment 22 is flat, meaning that the width of the second welding segment 22 is greater than the height of the second welding segment 22.
[0036] It should be noted that the surface with the largest area of the second welding section 22 faces the battery cell 10 or is in contact with the battery cell 10.
[0037] Please see Figure 3 In some embodiments, the battery cell 10 includes a first surface 12 and a second surface 13 facing away from each other. In two adjacent battery cells 10, the first surface 12 of one battery cell 10 is provided with a first welding section 21, and the second surface 13 of the other battery cell 10 is provided with a first welding section 21.
[0038] Thus, when two adjacent battery cells 10 are partially stacked, a stepped structure will appear between the two battery cells 10. Therefore, the solder ribbon 20 is connected to the battery cell 10 by interlacing vertically, so that the solder ribbon 20 is kept at the same height. This can improve the stability of the connection between the solder ribbon 20 and the battery cell 10, and the connection process of the solder ribbon 20 is easy to implement.
[0039] like Figure 3 As shown, the first surface 12 of the left battery cell 10 is provided with a first welding section 21, and the second surface 13 of the right battery cell 10 is provided with a second welding section 22.
[0040] Please see Figure 4 In some embodiments, the width of the first welding segment 21 is W1, and the width of the second welding segment 22 is W2, where 2 ≤ W2 / W1 ≤ 3. Alternatively, the width of the second welding segment 22 is greater than the width of the first welding segment 21. This allows the solder strip 20 to have a larger width at the second welding segment 22, which helps to reduce the contact area between the solder strip 20 and the stacked area 11 of the battery cell 10, thereby reducing the risk of cracks in the battery cell 10.
[0041] Specifically, W2 / W1 can be values such as 2, 2.2, 2.5, 3, etc. It can be understood that since the solder strip 20 is in the form of a long filament, the length of the solder strip 20 is the maximum dimension of the solder strip 20, the height direction and the length direction of the solder strip 20 are perpendicular to each other, and the height direction of the solder strip 20 is the same as the thickness direction of the battery cell 10.
[0042] Please see Figure 3 In some embodiments, the height of the first welding segment 21 is H1, and the height of the second welding segment 22 is H2, where 2 ≤ H1 / H2 ≤ 5. Alternatively, the height of the first welding segment 21 is greater than the height of the second welding segment 22, making it easier for the second welding segment 22 to be flattened. Specifically, H1 / H2 can be values such as 2, 2.5, 3, 4, and 5. The second welding segment 22 can be formed by pressing a welding segment of the same specifications as the first welding segment 21, resulting in a flattened shape.
[0043] Please see Figure 3 and Figure 4 In some embodiments, the width of the second welding segment 22 is W2, and the height of the second welding segment 22 is H2, where 3 ≤ W2 / H2 ≤ 14. For example, W2 / H2 can be values such as 3, 3.5, 6, 9, and 14. Thus, the width-to-height ratio of the second welding segment 22 is relatively large, the second welding segment 22 is flat, and the contact area between the second welding segment 22 and the solar cell 10 is large. This can reduce the pressure on the solar cell 10 during the manufacturing process of the curved photovoltaic tile 100, and reduce the risk of hidden cracks in the solar cell 10.
[0044] In some embodiments, the first weld segment 21 has a circular cross-section. This makes the first weld segment 21 easier to form and can reduce the manufacturing cost of the curved photovoltaic tile 100. Specifically, a single circular strip can be used, with a portion of the strip flattened, so that the flattened portion forms the second weld segment 22, and the unflattened portion forms the first weld segment 21.
[0045] Please see Figure 4 In some embodiments, the width of the first welding segment 21 is W1, where 0.18mm ≤ W1 ≤ 0.26mm. For example, W1 can be 0.18mm, 0.20mm, 0.24mm, 0.26mm, etc. Thus, when the first welding segment 21 is within the above range, it saves materials while meeting the conductivity requirements, reducing the manufacturing cost of the photovoltaic tile.
[0046] Please see Figure 4In some embodiments, the width of the second welding segment 22 is W2, where 0.3mm ≤ W2 ≤ 0.7mm. For example, W2 can be 0.3mm, 0.35mm, 0.4mm, 0.7mm, etc. In this way, the second welding segment 22 has a larger width, which can increase the contact area between the second welding segment 22 and the battery cell 10 and reduce the risk of cracks appearing in the battery cell 10.
[0047] Please see Figure 3 In some embodiments, the height of the first welding segment 21 is H1, where 0.18mm ≤ H1 ≤ 0.26mm. For example, H1 can be 0.18mm, 0.20mm, 0.24mm, 0.26mm, etc. Thus, when the first welding segment 21 is within the above range, it saves material while meeting the conductivity requirements, reducing the manufacturing cost of the photovoltaic tile. It can be understood that when the cross-section of the first welding segment 21 is circular, the height and width of the first welding segment 21 are equal, and both are equal to the diameter of the first welding segment 21.
[0048] Please see Figure 3 In some embodiments, the height of the second welding segment 22 is H2, where 0.05mm ≤ H2 ≤ 0.09mm. For example, H2 can be 0.05mm, 0.06mm, 0.07mm, 0.09mm, etc. Thus, the height of the second welding segment 22 is relatively small, and when the width of the second welding segment 22 is constant, material can be saved, reducing the manufacturing cost of the photovoltaic tile.
[0049] Please see Figure 2 In some embodiments, along the first direction D1, two adjacent solar cells 10 are connected by a plurality of solder ribbons 20, and the plurality of solder ribbons 20 are spaced apart along the second direction D2, which intersects the first direction D1. Thus, the plurality of solder ribbons 20 can improve the overcurrent capacity of the electrical connection between the two solar cells 10, and even if one solder ribbon 20 breaks, the other solder ribbons 20 can still electrically connect the two solar cells 10, improving the reliability of the curved photovoltaic tile 100. In the embodiments of this application, the first direction D1 and the second direction D2 are arranged perpendicularly.
[0050] Please see Figure 1 In some embodiments, the curved photovoltaic tile 100 further includes a back sheet 30 and a panel 40 stacked with the back sheet 30, with the solar cell 10 disposed between the back sheet 30 and the panel 40. Thus, the back sheet 30 and the panel 40 can protect the solar cell 10 and improve the lifespan of the curved photovoltaic tile 100. Specifically, the back sheet 30 can be made of metal or polymer material, and the panel 40 can be made of a light-transmitting material, allowing light to pass through the panel 40 and reach the solar cell 10. Both the back sheet 30 and the panel 40 are curved, and the back sheet 30 and the panel 40 can have curved peaks and troughs.
[0051] The photovoltaic module (not shown) according to the embodiments of this application includes multiple curved photovoltaic tiles 100, which are electrically connected. Thus, the electrical connection of multiple curved photovoltaic tiles 100 can increase the power generation of the photovoltaic module.
[0052] In the description of embodiments of this utility model, 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 embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0053] 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., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. 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.
[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A curved photovoltaic tile, characterized in that, include: Multiple solar cells are partially stacked in adjacent pairs along a first direction; The welding strip connects two adjacent solar cells. The welding strip includes multiple first welding segments and at least one second welding segment. The first welding segment is connected to a corresponding solar cell. The second welding segment connects two adjacent first welding segments along a first direction. The second welding segment is located between two adjacent solar cells and spans the stacked area of the two adjacent solar cells. The second welding segment is flat. The width of the first welding segment is W1, and the width of the second welding segment is W2, where 2≤W2 / W1≤3.
2. The curved photovoltaic tile according to claim 1, characterized in that, The battery cell includes a first surface and a second surface facing away from each other. In two adjacent battery cells, the first surface of one battery cell is provided with the first welding segment, and the second surface of the other battery cell is provided with the first welding segment.
3. The curved photovoltaic tile according to claim 1, characterized in that, The height of the first welding segment is H1, and the height of the second welding segment is H2, wherein 2≤H1 / H2≤5.
4. The curved photovoltaic tile according to claim 1, characterized in that, The width of the second welded segment is W2, and the height of the second welded segment is H2, wherein 3≤W2 / H2≤14.
5. The curved photovoltaic tile according to claim 1, characterized in that, The first welded section has a circular cross-section.
6. The curved photovoltaic tile according to claim 1, characterized in that, The width of the first welded segment is W1, 0.18mm ≤ W1 ≤ 0.26mm; and / or, The width of the second welded segment is W2, 0.3mm ≤ W2 ≤ 0.7mm; and / or, The height of the first welded segment is H1, 0.18mm ≤ H1 ≤ 0.26mm; and / or, The height of the second welded section is H2, where 0.05mm ≤ H2 ≤ 0.09mm.
7. The curved photovoltaic tile according to claim 1, characterized in that, Along the first direction, two adjacent battery cells are connected by a plurality of solder strips, and the plurality of solder strips are spaced apart along a second direction, which intersects with the first direction.
8. The curved photovoltaic tile according to claim 1, characterized in that, The curved photovoltaic tile also includes a back sheet and a panel stacked with the back sheet, with the solar cells disposed between the back sheet and the panel.
9. A photovoltaic module, characterized in that, It includes multiple curved photovoltaic tiles as described in any one of claims 1-8, wherein the multiple curved photovoltaic tiles are electrically connected.