Curved-surface photovoltaic tile and photovoltaic module

Abstract

The invention discloses a curved-surface photovoltaic tile and a photovoltaic module. The curved-surface photovoltaic tile comprises a panel, a plurality of battery pieces, a welding strip and a back plate, the battery pieces are arranged in at least one direction, the welding strip is connected with two adjacent battery pieces in the first direction, first welding spots and second welding spots which are welded to the battery pieces are formed on the welding strip, the first welding spots are located at the two ends of the battery pieces, and the second welding spots are located at the two ends of the back plate. The area of the first welding spots is larger than or equal to 1.56 mm < 2 >, the second welding spots are located between the first welding spots, the area of the second welding spots is larger than or equal to 1.44 mm < 2 >, the battery piece is located between the panel and the back plate, and the panel, the battery piece and the back plate are in a curved surface shape. Therefore, the welding strip can realize electric connection of a plurality of battery pieces, and by increasing the areas of the first welding spots and the second welding spots, the welding area of the welding strip and the battery pieces can be increased, and the structural strength of the welding spots is improved, so that the welding strength of the battery pieces and the welding strip is improved while the internal resistance is not increased; therefore, the risk of unsoldering between the battery piece and the solder strip caused by welding spot failure is reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a curved photovoltaic tile and a photovoltaic module. Background Technology

[0002] With the increasing prominence of severe issues 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. Typically, photovoltaic tiles consist of multiple photovoltaic cell strings, where multiple cells are connected by solder ribbons. However, during the manufacturing process of curved photovoltaic tiles, the cells undergo certain deformations at various locations, making it easy for the cells to detach from the solder ribbons. Summary of the Invention

[0003] This invention provides a curved photovoltaic tile and a photovoltaic module.

[0004] The curved photovoltaic tile of this application includes a panel, multiple solar cells, a solder strip, and a backsheet. The multiple solar cells are arranged along at least one direction, and the solder strip connects two adjacent solar cells along a first direction. The solder strip forms a first solder joint and a second solder joint for welding to the solar cells. The first solder joint is located at both ends of the solar cell, and the area of ​​the first solder joint is greater than or equal to 1.56 mm². 2 The second solder joint is located between the first solder joints, and the area of ​​the second solder joint is greater than or equal to 1.44 mm². 2 The solar cells are located between the front panel and the back panel, and the front panel, solar cells, and back panel are curved.

[0005] In the curved photovoltaic tile of this application embodiment, the solder strip can realize the electrical connection of multiple solar cells. By increasing the area of ​​the first solder point and the second solder point, the welding area between the solder strip and the solar cell can be increased, and the structural strength of the solder point can be improved. This improves the welding strength between the solar cell and the solder strip without increasing the internal resistance, thereby reducing the risk of the solar cell and the solder strip detaching due to solder point failure.

[0006] In some implementations, the size of the first solder joint is greater than or equal to 1.2 mm × 1.3 mm.

[0007] In some implementations, the size of the second solder joint is greater than or equal to 1.2 mm × 1.2 mm.

[0008] In some implementations, the thickness of the first solder joint is T1, where 20 μm ≤ T1 ≤ 30 μm.

[0009] In some implementations, the thickness of the second solder joint is T2, where 20 μm ≤ T2 ≤ 30 μm.

[0010] In some embodiments, the raw material for forming the solder joint includes silver paste, wherein the silver content in the silver paste is 80%-100%.

[0011] In some embodiments, there are multiple solder strips, which are spaced apart along a second direction that intersects with the first direction.

[0012] In some implementations, the solder strip is flat.

[0013] In some embodiments, the curved photovoltaic tile further includes an encapsulating film layer disposed between the backsheet and the solar cells and / or between the panel and the solar cells.

[0014] 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.

[0015] Additional aspects and advantages of the 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

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a three-dimensional schematic diagram of the curved photovoltaic tile according to an embodiment of the present invention;

[0018] Figure 2 This is a partial structural schematic diagram of the curved photovoltaic tile according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the width direction of the first and second solder joints according to an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 An enlarged schematic diagram of Part I;

[0021] Figure 5 This is a schematic diagram of the thickness direction of the first and second solder joints according to an embodiment of the present invention;

[0022] Figure 6 yes Figure 5 An enlarged schematic diagram of part II.

[0023] Explanation of reference numerals in the attached drawings: 100, curved photovoltaic tile; 10, solar cell; 20, solder strip; 21, first solder joint; 22, second solder joint; 30, backplate; 40, front panel; 50, encapsulating film layer; D1, first direction; D2, second direction. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which 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 the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly 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 for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[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 the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit 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 arrangements 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] Please see Figures 1-3 The curved photovoltaic tile 100 of this application includes a plurality of solar cells 10, a solder strip 20, a backsheet 30, and a front panel 40. The plurality of solar cells 10 are arranged along at least one direction. The solder strip 20 connects two adjacent solar cells 10 along a first direction D1. The solder strip 20 forms a first solder joint 21 and a second solder joint 22 for welding to the solar cells 10. The first solder joint 21 is located at both ends of the solar cell 10, and the area of ​​the first solder joint 21 is greater than or equal to 1.56 mm². 2 The second solder joint 22 is located between the first solder joints 21, and the area of ​​the second solder joint 22 is greater than or equal to 1.44 mm². 2 The battery cell 10 is located between the panel 40 and the back plate 30, and the panel 40, battery cell 10 and back plate 30 are curved.

[0030] In the curved photovoltaic tile 100 of this embodiment, the solder ribbon 20 can electrically connect multiple solar cells 10. By increasing the area of ​​the first solder joint 21 and the second solder joint 22, the welding area between the solder ribbon 20 and the solar cell 10 can be increased, improving the structural strength of the solder joint. This increases the welding strength between the solar cell 10 and the solder ribbon 20 without increasing the internal resistance, thereby reducing the risk of solder joint failure leading to detachment between the solar cell 10 and the solder ribbon 20. When the solder ribbon 20 is soldered onto the solar cell 10 with solder joints of the above dimensions, the effective welding area can be increased by 50%.

[0031] 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 (PassivateT Emitter Rear Cell) technology or Topcon (Tunnel OxiTe PassivateT Contact) technology. The solar cell 10 can be curved after pressing.

[0032] The solar cell 10 can be a complete solar cell 10 or a sliced ​​solar cell 10 cut from a complete solar cell 10. Multiple solar cells 10 can be arranged in a flat configuration, meaning they are arranged along their length or width. In one embodiment, the first direction D1 is the width direction of the solar cells 10, and the multiple solar cells 10 are arranged along their width. Solder ribbon 20 is used to electrically connect the multiple solar cells 10. The solder ribbon 20 can be made of conductive materials such as silver, tin, or alloys to improve its conductivity.

[0033] The backsheet 30 and the front panel 40 protect the solar cells 10 and improve the lifespan of the curved photovoltaic tile 100. The backsheet 30 can be made of metal or polymer material, and the front panel 40 can be made of light-transmitting material, allowing light to pass through the front panel 40 and reach the solar cells 10. The front panel 40, solar cells 10, and backsheet 30 are all curved, and the front panel 40, solar cells 10, and backsheet 30 can have peaks and troughs on their curved surfaces.

[0034] The first solder joint 21 can be the connection point between the two ends of the battery cell 10 and the solder strip 20, and the second solder joint 22 can be the connection point between the middle part of the battery cell 10 and the solder strip 20. There can be two first solder joints 21, and one, two, three, four, five, or more second solder joints 22. The area of ​​the first solder joint 21 can be 1.56 mm². 2 1.58mm 2 1.60mm 2 1.62mm 2 1.64mm 2 1.66mm 2 The area of ​​the second solder joint 22 can be 1.44 mm². 2 1.46mm 2 1.48mm 2 1.50mm 2 1.52mm 2 1.54mm 2 The area of ​​the first solder joint 21 may be larger than the area of ​​the second solder joint 22. The shape of the first solder joint 21 and / or the second solder joint 22 includes one or more combinations of rectangle, rhombus, circle and ellipse. The shape of the first solder joint 21 and the shape of the second solder joint 22 may be the same or different.

[0035] In some implementations, the size of the first solder joint 21 is greater than or equal to 1.2 mm × 1.3 mm.

[0036] Thus, when the size of the first solder joint 21 meets the above conditions, the welding area between the solder strip 20 and the battery cell 10 can be increased, the welding strength between the battery cell 10 and the solder strip 20 can be improved, thereby reducing the risk of the battery cell 10 and the solder strip 20 detaching.

[0037] Specifically, such as Figure 3 and Figure 4 As shown, when the shape of the first solder joint 21 is rectangular, the dimensions of the first solder joint 21 include the length L1 and the width W1 of the first solder joint 21. The length direction of the first solder joint 21 can be the same as the length direction of the battery cell 10, and the width direction of the first solder joint 21 can be the same as the width direction of the battery cell 10.

[0038] The length L1 of the first solder joint 21 can be greater than 1.3 mm, and the width W1 of the first solder joint 21 can be greater than 1.2 mm. For example, the length L1 of the first solder joint 21 is 1.5 mm, and the width W1 of the first solder joint 21 is 1.45 mm.

[0039] In some implementations, the size of the second solder joint 22 is greater than or equal to 1.2mm × 1.2mm.

[0040] Thus, when the size of the second solder joint 22 meets the above conditions, the welding area between the solder strip 20 and the battery cell 10 can be increased, the welding strength between the battery cell 10 and the solder strip 20 can be improved, thereby reducing the risk of the battery cell 10 and the solder strip 20 detaching.

[0041] Specifically, such as Figure 3 and Figure 4 As shown, when the shape of the second solder joint 22 is rectangular, the dimensions of the second solder joint 22 include the length L2 of the second solder joint 22 and the width W2 of the second solder joint 22. The length direction of the second solder joint 22 can be the same as the length direction of the battery cell 10, and the width direction of the second solder joint 22 can be the same as the width direction of the battery cell 10.

[0042] The length L2 of the second solder joint 22 can be greater than 1.2 mm, and the width W2 of the second solder joint 22 can be greater than 1.2 mm. For example, the length L2 of the second solder joint 22 is 1.4 mm, and the width W2 of the second solder joint 22 is 1.32 mm.

[0043] Please see Figure 5 and Figure 6 In some embodiments, the thickness of the first solder joint 21 is T1, where 20μm≤T1≤30μm.

[0044] Thus, when the thickness of the first solder joint 21 is within the above-mentioned range, the occurrence of incomplete or over-welded solder joints between the solder strip 20 and the end of the battery cell 10 can be reduced, thereby improving the welding quality and welding efficiency between the solder strip 20 and the end of the battery cell 10.

[0045] Specifically, the thickness direction of the first solder joint 21 can be the same as the thickness direction of the battery cell 10, and the length direction, width direction and thickness direction of the first solder joint 21 are perpendicular to each other. The thickness T1 of the first solder joint 21 can be 20μm, 22μm, 23μm, 24μm, 25μm, 30μm, etc.

[0046] Please see Figure 5 and Figure 6 In some embodiments, the thickness of the second solder joint 22 is T2, where 20μm≤T2≤30μm.

[0047] Thus, when the thickness of the second solder joint 22 is within the above-mentioned range, the occurrence of incomplete or over-welded solder joints between the solder strip 20 and the end of the battery cell 10 can be reduced, thereby improving the welding quality and welding efficiency between the solder strip 20 and the end of the battery cell 10.

[0048] Specifically, the thickness direction of the second solder joint 22 can be the same as the thickness direction of the solar cell 10, and the length, width, and thickness directions of the second solder joint 22 are perpendicular to each other. The thickness T2 of the second solder joint 22 can be 20μm, 21μm, 23μm, 25μm, 27μm, 29μm, 30μm, etc. The thickness T1 of the first solder joint 21 can be the same as or different from the thickness T2 of the second solder joint 22.

[0049] In some embodiments, the raw material for forming the solder joint includes silver paste, wherein the silver content in the silver paste is 80%-100%.

[0050] Thus, by increasing the silver content in the silver paste, the metal filling rate and density of the solder joint can be improved, thereby enhancing the welding pull between the solder strip 20 and the cell 10, and reducing the risk of the cell 10 and the solder strip 20 desoldering.

[0051] Specifically, the principle of silver paste welding is to utilize the high-temperature melting property of silver paste. The silver paste is applied to the surfaces of the battery cell 10 and the solder ribbon 20 to be welded, and then heated to melt the silver paste, thereby connecting the battery cell 10 and the solder ribbon 20 together. Using silver paste for welding offers advantages such as high strength, high conductivity, and corrosion resistance.

[0052] Silver paste can be formulated from silver or silver compounds, flux, binder and diluent. The silver content in silver paste refers to the percentage of the weight of silver in the silver paste. The silver content in silver paste can be 80%, 85%, 90%, 95%, 100%, etc.

[0053] Please see Figure 2 In some embodiments, there are multiple solder strips 20, which are arranged at intervals along the second direction D2, and the second direction D2 intersects the first direction D1.

[0054] In this way, the connection between two adjacent solar cells 10 is achieved by multiple solder ribbons 20, which can improve the overcurrent capacity of the electrical connection between the two solar cells 10. Furthermore, even if one of the solder ribbons 20 breaks, the other solder ribbons 20 can still electrically connect the two solar cells 10, thereby improving the reliability of the curved photovoltaic tile 100.

[0055] In this embodiment, the first direction D1 and the second direction D2 are perpendicularly arranged. The first direction D1 can be the length direction of the battery cell 10, and the second direction D2 can be the width direction of the battery cell 10; alternatively, the first direction D1 can be the width direction of the battery cell 10, and the second direction D2 can be the length direction of the battery cell 10. The arrangement direction of the plurality of solder ribbons 20 can be perpendicular to the arrangement direction of the plurality of battery cells 10.

[0056] The number of solder ribbons 20 can be 12, 14, 16, 18, 20, etc. In three adjacent solar cells 10, some of the solder ribbons 20 are electrically connected to the positive electrode of the first solar cell 10 and the positive electrode of the second solar cell 10, and the remaining solder ribbons 20 are electrically connected to the negative electrode of the second solar cell 10 and the negative electrode of the third solar cell 10.

[0057] In some embodiments, the solder strip 20 is flat.

[0058] Thus, the flat shape of the welding ribbon 20 increases the contact area between the welding ribbon 20 and the battery cell 10, reduces the pressure on the battery cell 10, and thus reduces defects such as cracks in the battery cell 10. At the same time, the flat shape of the welding ribbon 20 allows for better welding between the welding ribbon 20 and the battery cell 10, further improving the reliability of the welding between the welding ribbon 20 and the battery cell 10.

[0059] Specifically, the weld ribbon 20 is flat, meaning that the width of the weld ribbon 20 is greater than its thickness. The thickness direction of the weld ribbon 20 can be the same as the thickness direction of the battery cell 10, and the length direction of the weld ribbon 20 is the same as the arrangement direction of the multiple battery cells 10. The length, width, and thickness directions of the weld ribbon 20 are perpendicular to each other. The flat weld ribbon 20 can be obtained by flattening the round wire weld ribbon 20.

[0060] Please see Figure 1 In some embodiments, the curved photovoltaic tile 100 further includes an encapsulating film layer 50, which is disposed between the back sheet 30 and the solar cell 10 and / or between the panel 40 and the solar cell 10.

[0061] Thus, the backplate 30 and the battery cell 10, and / or the panel 40 and the battery cell 10, can be connected and fixed by the encapsulating film layer 50, achieving lamination encapsulation between the backplate 30 and the battery cell 10 and / or the panel 40 and the battery cell 10, forming a stable and reliable structure. In addition, the encapsulating film layer 50 can act as a buffer between the backplate 30 and the battery cell 10 and / or the panel 40 and the battery cell 10, preventing cell breakage due to lamination.

[0062] Specifically, an encapsulating film layer 50 can be provided between the backsheet 30 and the battery cell 10, or between the panel 40 and the battery cell 10, or both the backsheet 30 and the battery cell 10 and the panel 40 and the battery cell 10 can have an encapsulating film layer 50. The encapsulating film layer 50 can be made of EVA, POE, or EPE material. The material of the encapsulating film layer 50 between the backsheet 30 and the battery cell 10 can be the same as or different from the material of the encapsulating film layer 50 between the panel 40 and the battery cell 10.

[0063] 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.

[0064] 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 the invention. 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.

[0065] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A curved photovoltaic tile, characterized in that, include: panel; Multiple solar cells, wherein the multiple solar cells are arranged along at least one direction; A solder strip connects two adjacent battery cells along a first direction. The solder strip forms a first solder joint and a second solder joint for welding to the battery cells. The first solder joint is located at both ends of the battery cell, and the area of ​​the first solder joint is greater than or equal to 1.56 mm². 2 The second solder joint is located between the first solder joints, and the area of ​​the second solder joint is greater than or equal to 1.44 mm². 2 ; The back panel, wherein the battery cell is located between the front panel and the back panel, and the front panel, the battery cell, and the back panel are curved.

2. The curved photovoltaic tile according to claim 1, characterized in that, The size of the first solder joint is greater than or equal to 1.2mm × 1.3mm.

3. The curved photovoltaic tile according to claim 1, characterized in that, The size of the second solder joint is greater than or equal to 1.2mm × 1.2mm.

4. The curved photovoltaic tile according to claim 1, characterized in that, The thickness of the first solder joint is T1, where 20μm≤T1≤30μm.

5. The curved photovoltaic tile according to claim 1, characterized in that, The thickness of the second weld point is T2, where 20μm≤T2≤30μm.

6. The curved photovoltaic tile according to claim 1, characterized in that, The raw material used to form the solder joint includes silver paste, wherein the silver content in the silver paste is 80%-100%.

7. The curved photovoltaic tile according to claim 1, characterized in that, The number of welding strips is multiple, and the multiple welding strips are arranged at intervals along a second direction, which intersects with the first direction.

8. The curved photovoltaic tile according to claim 1, characterized in that, The welding strip is flat.

9. The curved photovoltaic tile according to claim 1, characterized in that, The curved photovoltaic tile also includes an encapsulating film layer, which is disposed between the back sheet and the solar cell and / or between the panel and the solar cell.

10. A photovoltaic module, characterized in that, It includes multiple curved photovoltaic tiles as described in any one of claims 1-9, wherein the multiple curved photovoltaic tiles are electrically connected.

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