Photovoltaic welding strip

Abstract

The utility model relates to the field of solar cells, in particular to a photovoltaic solder strip. The photovoltaic solder strip provided by the utility model comprises a reflective section, and the reflective section is used for being arranged on the front surface of a first solar cell. The reflective section comprises a first conductor and a first solder layer coated on the surface of the first conductor. The first conductor comprises a top and a bottom in the height direction of the reflective section. The cross section of the top is triangular, the top comprises a first surface and a second surface, and the first surface and the second surface are located on the two waists of the top. The bottom of the first conductor is provided with a first groove, and a first cavity is formed between the bottom of the first conductor and the first solder layer due to the first groove. Therefore, when the temperature rises, the thermal expansion of the first solder layer and the first conductor can be relieved due to the existence of the first cavity, and the first solder layer and the first conductor can expand towards the first cavity, so that the extrusion of the reflective section of the photovoltaic solder strip on the first solar cell is reduced, and the cracking risk is reduced.

Description

Technical Field

[0001] This application relates to the field of solar cells, and more particularly to a photovoltaic ribbon. Background Technology

[0002] Photovoltaic ribbons are key components for connecting solar cells, used to connect multiple solar cells in series or parallel to form solar cell modules.

[0003] Common photovoltaic welding ribbons are rectangular. Because rectangular welding ribbons can block the front area of ​​the solar cells they are connected to, they reduce the area of ​​the solar cells that receive light, thus affecting the light utilization rate of the photovoltaic module surface.

[0004] To improve the light utilization rate of photovoltaic module surfaces, related technologies have modified the portion of the photovoltaic ribbon on the front of the solar cell to have a triangular cross-section. By reflecting light through the surfaces where the two sides of the triangle are located, the light that shines on the photovoltaic ribbon is reflected onto the solar cell, thereby improving the light utilization rate of the photovoltaic module surface.

[0005] The cross-sectional area of ​​photovoltaic (PV) solder ribbons affects their current-carrying capacity. When the PV solder ribbon is changed from a rectangular to a triangular cross-section, one possible way to achieve the same current-carrying capacity is to increase the width of the PV solder ribbon. Increasing the width of the PV solder ribbon undoubtedly increases the contact area between the PV solder ribbon and the solar cell. Since the PV solder ribbon and the solar cell have different coefficients of thermal expansion, increasing the contact area leads to an increased risk of solar cell cracking. Utility Model Content

[0006] This application provides a photovoltaic solder ribbon that can reduce the risk of cracking of triangular solder ribbons to a certain extent.

[0007] The technical solution of this application is as follows:

[0008] The photovoltaic solder strip provided in this application includes a reflective section for placement on the front side of a first solar cell. The reflective section includes a first conductor and a first solder layer coated on the surface of the first conductor.

[0009] Along the height direction of the reflective section, the first conductor includes a top and a bottom.

[0010] The top has a triangular cross-section and includes a first surface and a second surface. The first surface and the second surface are located on the two sides of the top. The surfaces of the first solder layer coated on the first surface and the second surface are used to reflect sunlight to the first solar cell.

[0011] A first groove is provided at the bottom of the first conductor, and a first cavity is formed between the bottom of the first conductor and the first solder layer due to the first groove.

[0012] Based on the photovoltaic ribbon provided in this application, by setting a first groove at the bottom of the first conductor of the reflective section, a first cavity is formed between the bottom of the first conductor and the first solder layer due to the first groove. In this way, when the temperature rises, the thermal expansion of the first solder layer and the first conductor can be alleviated by the presence of the first cavity. The first solder layer and the first conductor can expand towards the first cavity, thereby reducing the squeezing of the reflective section of the photovoltaic ribbon on the first solar cell and reducing the risk of cell cracking.

[0013] In one possible design, the photovoltaic ribbon includes a non-reflective section for placement on the back of the second solar cell.

[0014] The non-reflective section includes a second conductor and a second solder layer coated on the surface of the second conductor.

[0015] The second conductor has a rectangular cross-section and a second groove at its bottom. A second cavity is formed between the bottom of the second conductor and the second solder layer due to the second groove.

[0016] Based on the photovoltaic ribbon provided in this embodiment, a second groove is provided at the bottom of the second conductor in the non-reflective section, and a second cavity is formed between the bottom of the second conductor and the second solder layer due to the second groove. In this way, when the temperature rises, the thermal expansion of the second solder layer and the second conductor can be alleviated by the presence of the second cavity. The second solder layer and the second conductor can expand towards the second cavity, thereby reducing the compression of the photovoltaic ribbon on the second solar cell and reducing the risk of cracking.

[0017] In one possible design, the first groove includes a first sub-groove extending along the length of the first conductor. Thus, the first sub-groove can mitigate the expansion of the reflective section along its entire length.

[0018] And / or, the second groove includes a second sub-groove extending along the length of the second conductor. Thus, the second sub-groove can alleviate the expansion of the non-reflective segment along its entire length.

[0019] In one possible design, the first groove further includes a third sub-groove extending along the width direction of the first conductor. In this way, the third sub-groove can alleviate the expansion of the reflective section along its width direction.

[0020] And / or, the second groove also includes a fourth sub-groove extending along the width direction of the second conductor. Thus, the fourth sub-groove can mitigate the expansion of the non-reflective segment along its entire width.

[0021] In one possible design, the first sub-groove is connected to the third sub-groove. The second sub-groove is connected to the fourth sub-groove.

[0022] Based on the photovoltaic ribbon provided by this embodiment, when the first sub-groove and the third sub-groove are connected, a groove network is formed at the bottom of the first conductor. In this way, when the temperature rises, the thermal expansion of the first solder layer and the first conductor can be alleviated in the groove network, which helps to better reduce the impact of thermal expansion on the solar cell.

[0023] For reasons similar to those mentioned above, the second sub-groove is connected to the fourth sub-groove. This structural arrangement also helps to better reduce the impact of thermal expansion on solar cells, which will not be elaborated further here.

[0024] In one possible design, the bottom width of the first conductor is 0.4-0.7 mm, and the widths of the first and third sub-grooves are both 10-15 μm.

[0025] Based on the photovoltaic solder ribbon provided in this embodiment, the widths of the first and third sub-grooves are preferably between 10-15 μm. If the widths of the first and third sub-grooves are greater than 15 μm, the first solder layer is prone to clogging the first and third sub-grooves during the application of the first solder layer. If the widths of the first and third sub-grooves are less than 10 μm, the first and third sub-grooves will not significantly alleviate the expansion when the first conductor and the first solder layer undergo thermal expansion. Furthermore, due to limitations in processing technology, grooves that are too fine are not easy to manufacture.

[0026] In one possible design, along the height direction of the reflective section, the first conductor also includes a connecting portion with a rectangular cross-section. The connecting portion is connected to the top, and the bottom of the connecting portion is the bottom of the first conductor.

[0027] Based on the photovoltaic ribbon provided by this embodiment, the first conductor of this application includes a connecting portion with a rectangular cross-section. Thus, under the condition of the same current carrying area, compared with the reflective segment with a pure triangular cross-section that does not include the rectangular connecting portion, in one case, the width of the reflective segment can be reduced, that is, the contact area between the reflective segment and the first solar cell can be reduced, thereby reducing the risk of cracking of the first solar cell. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a photovoltaic ribbon connected in series with a solar cell.

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of a reflective section of a photovoltaic ribbon provided in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the first conductor in the reflective section of a photovoltaic ribbon, provided in an embodiment of this application.

[0031] Figure 4 The diagram shown is a cross-sectional structural schematic of a non-reflective section of a photovoltaic ribbon provided in an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the bottom structure of the first conductor of the reflective section of a photovoltaic ribbon, provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of another structure at the bottom of the first conductor of the reflective section of a photovoltaic ribbon, provided as an embodiment of this application.

[0034] The attached figures are labeled as follows:

[0035] 1. Photovoltaic welding ribbon; 11. Reflective section; 111. First conductor; 111A. Top; 111B. Bottom of the first conductor; 111B1. First groove; 111B11. Third sub-groove; 111B12. Second sub-groove; 111C. Connecting part; 112. First solder layer; 113. First cavity;

[0036] 12. Non-reflective section; 121. Second conductor; 121B. Bottom of the second conductor; 122. Second solder layer; 123. Second cavity;

[0037] 2. First solar cell;

[0038] 3. Second solar cell. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0041] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0044] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0045] The present application will be described in detail below with reference to the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of a photovoltaic ribbon connected in series with a solar cell. Please refer to it. Figure 1 In a solar photovoltaic module, the photovoltaic ribbon 1 is a carrier used to collect current. A portion of the photovoltaic ribbon 1 is connected to the front side of the first solar cell 2, and another portion is connected to the back side of the adjacent second solar cell 3. In this way, two adjacent solar cells can be connected in series.

[0047] The commonly used photovoltaic solder ribbon 1 is a rectangular solder ribbon with a rectangular cross-section. When the rectangular solder ribbon is placed on the front side of the first solar cell 2, it will undoubtedly block the front area of ​​the first solar cell 2, thereby affecting the light-illuminated area of ​​the first solar cell 2 and reducing the utilization rate of light.

[0048] In order to improve the light utilization rate of the photovoltaic module surface, the relevant technology changes the part of the photovoltaic ribbon 1 on the front of the first solar cell 2 to a triangular cross-section. The light is reflected by the two sides of the triangle, so that the light shining on the photovoltaic ribbon 1 is reflected onto the first solar cell 2, thereby improving the light utilization rate of the photovoltaic module.

[0049] The cross-sectional area of ​​the solder ribbon affects its current-carrying capacity. When the photovoltaic solder ribbon 1 is changed from a rectangular cross-section to a triangular cross-section, one possible way to achieve the same current-carrying capacity as the rectangular cross-section solder ribbon is to increase its width. However, increasing the width of the photovoltaic solder ribbon 1 will undoubtedly increase the contact area between the photovoltaic solder ribbon 1 and the solar cell. Due to the difference in thermal expansion coefficients between the photovoltaic solder ribbon 1 and the solar cell, the increased contact area will lead to an increased risk of solar cell cracking.

[0050] In view of this, please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the cross-sectional structure of a reflective section of a photovoltaic ribbon provided in an embodiment of this application. Figure 3 This is a schematic diagram of the cross-sectional structure of the first conductor in the reflective section of a photovoltaic ribbon, provided in an embodiment of this application.

[0051] Please combine Figure 1 , Figure 2 and Figure 3 The photovoltaic ribbon 1 provided in this application includes a reflective section 11, which is used to be disposed on the front side of the first solar cell 2. The reflective section 11 includes a first conductor 111 and a first solder layer 112 coated on the surface of the first conductor 111.

[0052] Along the height direction of the reflective section 11, the first conductor 111 includes a top 111A and a bottom 111B.

[0053] The top 111A has a triangular cross-section and includes a first surface and a second surface. The first surface and the second surface are located on the two sides of the triangular top 111A. The surfaces of the first solder layer coated on the first surface and the second surface are used to reflect sunlight to the first solar cell 2.

[0054] A first groove 111B1 is provided at the bottom 111B of the first conductor, and a first cavity 113 is formed between the bottom 111B of the first conductor and the first solder layer 112 due to the first groove 111B1.

[0055] Specifically, in photovoltaic ribbon 1, the material of the first conductor 111 is generally copper substrate, such as oxygen-free copper, tough copper, etc. The linear thermal expansion coefficient of copper substrate is usually 16.5×10-6 / ℃, which may vary slightly in different temperature ranges.

[0056] The first solder layer 112 on the surface of the first conductor 111 is made of materials such as tin-lead (Sn-Pb), tin-silver-copper (Sn-Ag-Cu) and tin-bismuth (Sn-Bi), and the coefficient of thermal expansion of these solders is usually between 20-28×10-6 / ℃.

[0057] The materials used in solar cells mainly include silicon-based materials (monocrystalline silicon, polycrystalline silicon), thin-film materials (amorphous silicon, copper indium gallium selenide, cadmium telluride), and compound semiconductor materials (gallium arsenide). The coefficient of thermal expansion of solar cells varies depending on the material; the coefficient of thermal expansion of common silicon-based substrates (monocrystalline silicon and polycrystalline silicon) is approximately (2.6-2.7)×10⁻⁶ / ℃.

[0058] As can be seen from the above, the thermal expansion coefficients of photovoltaic ribbon 1 and solar cell are significantly different, and the thermal expansion coefficient of photovoltaic ribbon 1 is generally greater than that of solar cell. Therefore, when the temperature rises, photovoltaic ribbon 1 is prone to squeezing the solar cell, which is one of the reasons for solar cell cracking.

[0059] The core idea of ​​this application is that by setting a first groove 111B1 at the bottom 111B of the first conductor of the reflective section 11 of the photovoltaic ribbon 1, a first cavity 113 is formed between the bottom 111B of the first conductor and the first solder layer 112 due to the first groove 111B1. In this way, when the temperature rises, the thermal expansion of the first solder layer 112 and the first conductor 111 can be alleviated by the presence of the first cavity 113. The first solder layer 112 and the first conductor 111 can expand towards the first cavity 113, thereby reducing the compression of the reflective section 11 of the photovoltaic ribbon 1 on the first solar cell 2 and reducing the risk of cracking.

[0060] It is understandable that the first groove 111B1 at the bottom of the first conductor 111 can be one or more, and the shape of the first groove 111B1 can be rectangular or other irregular structures.

[0061] It should be noted that the "triangular cross-section of the top 111A" mentioned in this application can be a triangle in a strict geometric sense, or it can be an approximate triangle with concave arcs on the sides or convex arcs on the corners.

[0062] Figure 4 The diagram shown is a cross-sectional structural schematic of a non-reflective section of a photovoltaic ribbon provided in an embodiment of this application. Please refer to it. Figure 4In some embodiments of this application, the photovoltaic ribbon 1 includes a non-reflective section 1211, which is used to be disposed on the back side of the second solar cell 3.

[0063] The non-reflective section 1211 includes a second conductor 121 and a second solder layer 122 coated on the surface of the second conductor 121.

[0064] The cross-section of the second conductor 121 is rectangular, and a second groove is provided at the bottom 121B of the second conductor. A second cavity 123 is formed between the bottom 121B of the second conductor and the second solder layer 122 due to the second groove.

[0065] Please combine Figure 1 and Figure 4 Specifically, in some embodiments of this application, the photovoltaic ribbon 1 includes a non-reflective section 1211, which is located on the back of the second solar cell. Therefore, the non-reflective section 1211 does not affect the light utilization rate of the photovoltaic module.

[0066] The non-reflective section 1211 can adopt a solder strip structure with a rectangular cross-section. Thus, under the same current carrying area, compared with a solder strip structure with a triangular cross-section, the non-reflective section 1211 with a rectangular cross-section can have a lower height in one case. This helps to reduce the overall height of the photovoltaic module and can reduce the use of encapsulation materials. At the same time, the non-reflective section 1211 with a rectangular cross-section can have good contact with the second solar cell 3.

[0067] In this application, the material of the second conductor 121 is the same as that of the first conductor 111, and the material of the second solder layer 122 is the same as that of the first solder layer 112. Although the rectangular cross-section non-reflective section 1211 can have good contact with the second solar cell 3, excessive compression of the non-reflective section 1211 due to the difference in thermal expansion coefficients between the non-reflective section 1211 and the second solar cell 3 is still one of the causes of cracking of the second solar cell 3 when the temperature rises.

[0068] Based on the same inventive concept as the reflective section 11, in some embodiments of this application, a second groove is provided at the bottom 121B of the second conductor of the non-reflective section 1211, and a second cavity 123 is formed between the bottom 121B of the second conductor and the second solder layer 122 due to the second groove. In this way, when the temperature rises, the thermal expansion of the second solder layer 122 and the second conductor 121 can be alleviated by the presence of the second cavity 123. The second solder layer 122 and the second conductor 121 can expand towards the second cavity 123, thereby reducing the compression of the photovoltaic ribbon 1 on the second solar cell 3 and reducing the risk of cracking.

[0069] It is understandable that the second groove at the bottom of the second conductor 121 can be one or more, and the shape of the second groove can be rectangular or other irregular structures.

[0070] It should be noted that the cross-section of the second conductor 121 mentioned in this application is rectangular. Here, the rectangle can be a rectangle in a strict geometric sense, or it can be a rounded rectangle or a similar rectangular shape.

[0071] Figure 5 This is a schematic diagram of the bottom 111B structure of the first conductor of the reflective section 11 of the photovoltaic ribbon 1 provided in an embodiment of this application. Please refer to it. Figure 3 and Figure 5 In some embodiments of this application, the first groove 111B1 includes a first sub-groove 111B11, which extends along the length direction of the first conductor 111.

[0072] Specifically, in some embodiments of this application, a first sub-groove 111B11 is provided at the bottom 111B of the first conductor, and the first sub-groove 111B11 can be formed along the length direction of the first conductor 111. In this way, the first sub-groove 111B11 can alleviate the expansion of the reflective segment 11 along the entire length direction of the reflective segment 11.

[0073] Based on the same inventive concept, in some embodiments of this application, the second groove includes a second sub-groove extending along the length of the second conductor 121. Thus, the second sub-groove can alleviate the expansion of the non-reflective segment 1211 along its entire length.

[0074] Figure 6 This is a schematic diagram of another structure of the bottom of the first conductor 111 of the reflective section 11 of the photovoltaic ribbon 1 provided in the embodiments of this application. Please refer to it. Figure 3 and Figure 6 In some embodiments of this application, the first groove 111B1 further includes a third sub-groove 111B12, which extends along the width direction of the first conductor 111.

[0075] Specifically, in some embodiments of this application, a third sub-groove 111B12 is provided at the bottom 111B of the first conductor, and the third sub-groove 111B12 can be formed along the width direction of the first conductor 111. In this way, the third sub-groove 111B12 can alleviate the expansion of the reflective segment 11 along the width direction of the reflective segment 11.

[0076] Based on the same inventive concept, in some embodiments of this application, the second groove includes a fourth sub-groove extending along the width direction of the second conductor 121. Thus, the fourth sub-groove can alleviate the expansion of the non-reflective segment 1211 along its entire width.

[0077] Please continue to refer to this. Figure 3 and Figure 6 In some embodiments of this application, the first sub-groove 111B11 is connected to the third sub-groove 111B12.

[0078] Specifically, in some embodiments of this application, multiple first sub-grooves 111B11 can be provided, each of which extends through the first conductor 111 along its length. Multiple third sub-grooves 111B12 can also be provided, each of which extends through the first conductor 111 along its width. When the first sub-grooves 111B11 and the third sub-grooves 111B12 are connected, a groove network is formed at the bottom 111B of the first conductor. Thus, when the temperature rises, the thermal expansion of the first solder layer 112 and the first conductor 111 can be mitigated within the groove network, helping to better reduce the impact of thermal expansion on the solar cell.

[0079] Based on the same inventive concept, multiple second sub-grooves can be provided, each of which extends through the second conductor 121 along its length. Similarly, multiple fourth sub-grooves can be provided, each extending through the second conductor 121 along its width. For reasons similar to those described above, the second and fourth sub-grooves are connected. This structural arrangement also helps to better reduce the impact of thermal expansion on the solar cell, which will not be elaborated further here.

[0080] Please continue to refer to this. Figure 6 In some embodiments of this application, the widths of the first sub-groove 111B11 and the third sub-groove 111B12 are both between 10-15 μm.

[0081] In this application, the widths of the first sub-groove 111B11 and the third sub-groove 111B12 are preferably between 10-15 μm. If the widths of the first sub-groove 111B11 and the third sub-groove 111B12 are greater than 15 μm, the first solder layer 112 is prone to clogging the first groove 111B11 and the third sub-groove 111B12 during the fabrication of the first solder layer 112. If the widths of the first sub-groove 111B11 and the third sub-groove 111B12 are less than 10 μm, the first sub-groove 111B11 and the third sub-groove 111B12 will not significantly alleviate the expansion when the first conductor 111 and the first solder layer 112 undergo thermal expansion. Furthermore, due to limitations in processing technology, grooves that are too fine are not easy to fabricate.

[0082] For the same reason, in some embodiments of this application, the width of the second sub-groove and the fourth sub-groove is preferably between 10-15 μm.

[0083] Please continue to refer to this. Figure 3 In one embodiment of this application, along the height direction of the reflective section 11, the first conductor 111 further includes a connecting portion 111C. The cross-section of the connecting portion 111C is rectangular. The connecting portion 111C is connected to the top 111A, and the bottom of the connecting portion 111C is the bottom 111B of the first conductor.

[0084] For details, please refer to [link / reference]. Figure 3 In some embodiments of this application, the cross-section of the reflective segment 11 can be divided into triangles and rectangles. The area where the triangle is located is the top 111A of the first conductor 111, the area where the rectangle is located is the connection portion 111C of the first conductor 111, and the bottom of the rectangle is the bottom 111B of the first conductor.

[0085] Along the height direction of the reflective section 11, the first conductor 111 of this application includes a connecting portion 111C with a rectangular cross-section. Thus, under the condition of the same current carrying area, compared with the reflective section 11 with a pure triangular cross-section that does not include the rectangular connecting portion 111C, in one case, the width of the reflective section 11 can be reduced, that is, the contact area between the reflective section 11 and the first solar cell 2 can be reduced, thereby reducing the risk of cracking of the first solar cell 2.

[0086] In some embodiments of this application, the width W1 of the reflective section 11 is 0.4-0.6 mm, the height H1 of the corresponding section of the connecting part 111C in the reflective section 11 is less than 0.1 mm, and the overall height H2 of the reflective section 11 is 0.120 mm-0.2 mm.

[0087] Specifically, in some embodiments of this application, the width W1 of the reflective segment 11 can be 0.4mm, 0.42mm, 0.45mm, 0.48mm, 0.5mm, 0.55mm, 0.6mm, etc. The height H1 of the connecting portion 111C in the corresponding segment of the reflective segment 11 can be 0.2mm, 0.3mm, 0.4mm, 0.6mm, 0.7mm, 0.8mm, 1.0mm, etc.; the overall height H2 of the reflective segment 11 can be 0.12mm, 0.14mm, 0.16mm, 0.17mm, 0.20mm, etc.

[0088] In this application, when the size of the reflective section meets the above conditions, it can ensure good contact between the reflective section and the first solar cell, and the reflectivity is good.

[0089] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0090] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A photovoltaic welding strip, characterized in that, The device includes a reflective section for being disposed on the front side of a first solar cell; the reflective section includes a first conductor and a first solder layer coated on the surface of the first conductor. Along the height direction of the reflective section, the first conductor includes a top and a bottom; The top has a triangular cross-section and includes a first surface and a second surface. The first surface and the second surface are located on the two sides of the top. The surfaces of the first solder layer coated on the first surface and the second surface are used to reflect sunlight to the first solar cell. The bottom of the first conductor is provided with a first groove, and a first cavity is formed between the bottom of the first conductor and the first solder layer due to the first groove.

2. The photovoltaic welding strip according to claim 1, characterized in that, The photovoltaic ribbon includes a non-reflective section, which is used to be disposed on the back of the second solar cell. The non-reflective section includes a second conductor and a second solder layer coated on the surface of the second conductor; The second conductor has a rectangular cross-section, and a second groove is provided at the bottom of the second conductor. A second cavity is formed between the bottom of the second conductor and the second solder layer due to the second groove.

3. The photovoltaic welding strip according to claim 2, characterized in that, The first groove includes a first sub-groove, which extends along the length direction of the first conductor; And / or, the second groove includes a second sub-groove extending along the length direction of the second conductor.

4. The photovoltaic welding strip according to claim 3, characterized in that, The first groove further includes a third sub-groove, which extends along the width direction of the first conductor; And / or, the second groove further includes a fourth sub-groove extending along the width direction of the second conductor.

5. The photovoltaic welding strip according to claim 4, characterized in that, The first sub-groove is connected to the third sub-groove; the second sub-groove is connected to the fourth sub-groove.

6. The photovoltaic welding strip according to claim 4, characterized in that, The width of both the first sub-groove and the third sub-groove is 10-15 μm.

7. The photovoltaic welding strip according to any one of claims 1 to 6, characterized in that, Along the height direction of the reflective section, the first conductor further includes a connecting portion, the cross-section of which is rectangular, the connecting portion is connected to the top, and the bottom of the connecting portion is the bottom of the first conductor.

8. The photovoltaic welding strip according to claim 7, characterized in that, The width W1 of the reflective section is 0.4-0.6mm, the height H1 of the connecting part in the corresponding section of the reflective section is less than 0.1mm, and the overall height H2 of the reflective section is 0.120mm-0.2mm.

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