Photovoltaic cell string and photovoltaic module

Abstract

The utility model discloses a photovoltaic cell string and a photovoltaic assembly. The photovoltaic cell string comprises a plurality of photovoltaic cells, a plurality of solder strips and at least one bus bar. Wherein the plurality of photovoltaic cells are arranged along a first direction; the plurality of solder strips are arranged on one side of the plurality of photovoltaic cells in the second direction, the plurality of solder strips are spaced along the third direction, each solder strip extends along the first direction, and the first direction, the second direction and the third direction are orthogonal to one another; the bus bars are arranged between two adjacent photovoltaic cells, and the bus bars are arranged between the welding strip and the photovoltaic cells in the second direction and extend in the third direction; the bus bar comprises an electric conductor and an insulating layer, the electric conductor is located between the welding strip and the photovoltaic battery piece in the second direction, and the insulating layer is arranged on the side, close to the photovoltaic battery piece, of the electric conductor. According to the photovoltaic cell string provided by the utility model, the electrical performance of the photovoltaic cell string is ensured, and the photovoltaic cell string is beautiful in appearance.

Description

Technical Field

[0001] The utility model relates to the field of solar photovoltaics, in particular to a photovoltaic cell string and a photovoltaic component. Background Art

[0002] In the prior art, black spacers are placed between adjacent back-contact cells, or between the backsheet and the solder ribbon of a back-contact cell, to achieve uniform appearance across the entire photovoltaic module. However, since spacers are typically insulating, they can result in poor conductivity between adjacent back-contact cells at the spacer strip, impacting the module's electrical performance. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a photovoltaic cell string that ensures the electrical performance of the photovoltaic cell string and has an aesthetically pleasing appearance.

[0004] Another object of the present invention is to provide a photovoltaic assembly comprising the photovoltaic cell string.

[0005] According to the photovoltaic cell string of the embodiment of the first aspect of the present invention, it includes: a plurality of photovoltaic cells, and the plurality of photovoltaic cells are arranged along a first direction; a plurality of welding strips, and the plurality of welding strips are arranged on one side of the plurality of photovoltaic cells in a second direction, and the plurality of welding strips are spaced apart along a third direction, each welding strip extends along the first direction, and the first direction, the second direction and the third direction are orthogonal to each other; at least one bus bar, the bus bar is arranged between two adjacent photovoltaic cells, and in the second direction the bus bar is arranged between the welding strip and the photovoltaic cell, and the bus bar extends along the third direction; wherein the bus bar includes a conductor and an insulating layer, in the second direction the conductor is located between the welding strip and the photovoltaic cell, and the insulating layer is arranged on a side of the conductor adjacent to the photovoltaic cell.

[0006] The photovoltaic cell string according to the embodiment of the present invention improves the conductivity at the gap between two photovoltaic cells, ensuring the electrical performance of the photovoltaic cell string. The provision of the insulating layer makes the front appearance of the photovoltaic cell beautiful, and the process flow of the photovoltaic cell string is simple.

[0007] According to some embodiments of the present invention, the thickness of the insulating layer in the second direction is smaller than the thickness of the conductor.

[0008] According to some embodiments of the present invention, the thickness of the insulating layer in the second direction is D1, and the thickness of the conductor in the second direction is D2, wherein D1 and D2 respectively satisfy: 5um≤D1≤100um, 100um≤D2≤300um.

[0009] According to some embodiments of the present invention, the plurality of photovoltaic cells are evenly spaced apart along the first direction, and the width of the bus bar in the first direction is greater than the minimum distance between two adjacent photovoltaic cells.

[0010] According to some embodiments of the present invention, the width of the busbar in the first direction is W, wherein W satisfies: 1 mm ≤ W ≤ 10 mm.

[0011] According to some embodiments of the present invention, the plurality of welding strips include a plurality of positive welding strips and a plurality of negative welding strips, and the plurality of positive welding strips and the plurality of negative welding strips are staggered along the third direction; wherein, each of the positive welding strips includes a first welding strip segment and a second welding strip segment connected to each other, and each of the negative welding strips includes a third welding strip segment and a fourth welding strip segment connected to each other, the first welding strip segment and the third welding strip segment are both connected to the photovoltaic cell sheet, and the second welding strip segment and the fourth welding strip segment are both located on the outside of the photovoltaic cell sheet and connected to the conductor.

[0012] According to some embodiments of the present invention, the width of the bus bar in the first direction is greater than or equal to the sum of the widths of the second welding ribbon segment and the fourth welding ribbon segment.

[0013] According to some embodiments of the present invention, the insulating layer is a black insulating layer.

[0014] According to some embodiments of the present invention, a soldering layer is provided on a side of the conductor away from the photovoltaic cell.

[0015] The photovoltaic assembly according to the embodiment of the second aspect of the present invention includes the photovoltaic cell string according to the embodiment of the first aspect of the present invention.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a schematic diagram of the back side of a photovoltaic cell string according to an embodiment of the present utility model;

[0019] Figure 2 is a side view of a photovoltaic cell string according to an embodiment of the present utility model;

[0020] Figure 3 is a schematic diagram of a bus bar according to an embodiment of the present utility model;

[0021] Figure 4 is a schematic diagram of a photovoltaic cell and a welding ribbon according to an embodiment of the present utility model;

[0022] Figure 5 It is a front schematic diagram of a photovoltaic cell string according to an embodiment of the present utility model.

[0023] Description of reference numerals:

[0024] 100. Photovoltaic cell string; 1. Photovoltaic cell; 2. Welding ribbon; 21. Positive electrode welding ribbon; 211. First welding ribbon segment; 212. Second welding ribbon segment; 22. Negative electrode welding ribbon; 221. Third welding ribbon segment; 222. Fourth welding ribbon segment; 3. Busbar; 31. Conductor; 32. Insulation layer; 33. Soldering layer. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 A photovoltaic cell string 100 according to an embodiment of the first aspect of the present invention is described.

[0026] like Figure 1-Figure 3 As shown, a photovoltaic cell string 100 according to an embodiment of the first aspect of the present invention comprises a plurality of photovoltaic cells 1, a plurality of welding ribbons 2 and at least one bus bar 3. In the description of the present invention, "plurality" means two or more.

[0027] Specifically, a plurality of photovoltaic cells 1 are arranged along a first direction (eg, Figure 1 The plurality of welding strips 2 are all provided on the plurality of photovoltaic cells 1 in the second direction (for example, Figure 2 On one side of the vertical direction), a plurality of welding strips 2 are arranged along a third direction (for example, Figure 1The busbars 3 are spaced apart in the left-right direction (in the left-right direction), and each welding ribbon 2 extends along a first direction. The first, second, and third directions are orthogonal to each other. A busbar 3 is provided between two adjacent photovoltaic cells 1. In the second direction, the busbar 3 is provided between the welding ribbon 2 and the photovoltaic cell 1. The busbar 3 extends along the third direction. The busbar 3 includes a conductor 31 and an insulating layer 32. In the second direction, the conductor 31 is located between the welding ribbon 2 and the photovoltaic cell 1, and the insulating layer 32 is provided on the side of the conductor 31 adjacent to the photovoltaic cell 1.

[0028] It should be noted that the photovoltaic cell 1 may be a back contact cell, the first direction may be the thickness direction of the photovoltaic cell 1 , the second direction may be the length direction of the photovoltaic cell 1 , and the third direction may be the width direction of the photovoltaic cell 1 .

[0029] For example, in Figure 1 and Figure 2 In the example, the welding ribbons 2 and busbars 3 can both be provided on the back side of the photovoltaic cell 1. When connecting multiple photovoltaic cells 1, the welding ribbons 2 are first laid on the back side of the photovoltaic cell 1 and connected to the photovoltaic cell 1. Then, the multiple photovoltaic cells 1 are arranged along a first direction, and the busbars 3 are laid between two adjacent photovoltaic cells 1. The welding ribbons 2 on the two adjacent photovoltaic cells 1 are welded to the busbars 3, that is, the conductors 31 act as conductors for the welding ribbons 2. Therefore, the provision of the conductors 31 improves the conductivity of the gap between two adjacent photovoltaic cells 1, ensuring the electrical performance of the photovoltaic cell string 100.

[0030] The insulating layer 32 is arranged on the side of the conductor 31 adjacent to the photovoltaic cell 1, that is, in the first direction, the insulating layer 32 is located between two adjacent photovoltaic cells 1, which can insulate the two adjacent photovoltaic cells 1 to prevent the conductor 31 from contacting the photovoltaic cell 1 and causing a short circuit. The insulating layer 32 also blocks the gap between the two adjacent photovoltaic cells 1, making the front appearance of the photovoltaic cell string 100 beautiful.

[0031] According to the photovoltaic cell string of the present invention, a busbar 3 is provided between two adjacent photovoltaic cells 1, and the conductor 31 of the busbar 3 is electrically connected to the welding ribbon 2. The insulating layer 32 of the busbar 3 is located on the back side of the photovoltaic cell string 100. Therefore, the insulating layer 32 can cover the gap between the two adjacent photovoltaic cells 1, and the front appearance of the photovoltaic cell string 100 can be completely black. As a result, compared with traditional cell strings, the conductivity in the gap between two adjacent photovoltaic cells 1 is improved, the electrical performance of the photovoltaic cell string 100 is guaranteed, and the front appearance of the photovoltaic cell string 100 is more beautiful.

[0032] According to some embodiments of the present invention, Figure 3As shown, in the second direction, the thickness of the insulating layer 32 is less than the thickness of the conductor 31. By providing a conductor 31 of a certain thickness, the soldering ribbon 2 is in full contact with the conductor 31, further ensuring the conductivity of the busbar 3. In addition, by setting the thickness of the insulating layer 32 relatively thin, the insulation performance of the insulating layer 32 is met while reducing the manufacturing cost of the insulating layer 32. Moreover, the heat generated when the current passes through the conductor 31 can be quickly dissipated from the gap between two adjacent photovoltaic cells 1 through the thin insulating layer 32, preventing heat accumulation from affecting the conductivity of the conductor 1, further ensuring the electrical performance of the photovoltaic cell string 100.

[0033] According to some specific embodiments of the present invention, the thickness of the insulating layer 32 in the second direction is D1, and the thickness of the conductor 31 in the second direction is D2, where D1 and D2 respectively satisfy the following conditions: 5 μm ≤ D1 ≤ 100 μm, and 100 μm ≤ D2 ≤ 300 μm. When D1 is less than 5 μm, the insulating layer 32 is too thin, resulting in poor insulation performance, which can cause the conductor 31 to contact the photovoltaic cell 1 and cause a short circuit. When D1 is greater than 100 μm, the increased thickness of the insulating layer 32 increases manufacturing costs and affects the heat dissipation of the conductor 31, thereby affecting the electrical performance of the photovoltaic cell string 100. When D2 is less than 100 μm, the conductivity of the conductor 31 may not meet the circuit requirements between two adjacent photovoltaic cells 1, resulting in unstable current in the photovoltaic cell string 100 and affecting the overall conductivity of the photovoltaic cell string 100. When D2 is greater than 300 μm, the thickness of the conductor 31 increases, increasing manufacturing costs.

[0034] Therefore, by making the thickness D1 of the insulating layer 32 satisfy 5um≤D1≤100um and the thickness D2 of the conductor 31 satisfy 100um≤D2≤300um, the thickness of the insulating layer 32 and the thickness of the conductor 31 are reasonably set, while ensuring the insulation performance of the photovoltaic cell 1, the conductivity between two adjacent photovoltaic cell pieces 1 is improved, and the electrical performance of the photovoltaic cell string 100 is further guaranteed.

[0035] Alternatively, as Figure 2 As shown, multiple photovoltaic cells 1 are evenly spaced along a first direction, and the width of the busbar 3 in the first direction is greater than the minimum distance between two adjacent photovoltaic cells 1. Since the busbar 3 is disposed between two adjacent photovoltaic cells 1 and its width is greater than the minimum distance between two adjacent photovoltaic cells 1, the busbar 3 can completely cover the gap between any two adjacent photovoltaic cells 1, facilitating the connection between the busbar 3 and the welding ribbon 2 and ensuring the reliability of the electrical conductivity of the busbar 3. Furthermore, the structure of the photovoltaic cell string 100 is compact, allowing for the arrangement of more photovoltaic cells 1 within a limited size.

[0036] According to some specific embodiments of the present invention, the width of the busbar 3 in the first direction is W, where W satisfies the following conditions: 1 mm ≤ W ≤ 10 mm. When W is less than 1 mm, the busbar 3 cannot completely cover the gap between any two adjacent photovoltaic cells 1, resulting in an inability to reliably connect the busbar 3 to the welding ribbon 2, thereby affecting the conductivity of the busbar 3. When W is greater than 10 mm, the width of the busbar 3 increases, increasing production costs and wasting production materials.

[0037] Therefore, setting the width of the busbar 3 within a certain range ensures that the busbar 3 can completely cover the gap between any two adjacent photovoltaic cells 1 while avoiding material waste due to the busbar 3 being too wide.

[0038] According to some embodiments of the present invention, Figure 4 As shown, the multiple welding ribbons 2 include multiple positive electrode welding ribbons 21 and multiple negative electrode welding ribbons 22, and the multiple positive electrode welding ribbons 21 and multiple negative electrode welding ribbons 22 are staggered along the third direction. Each positive electrode welding ribbon 21 includes a first welding ribbon segment 211 and a second welding ribbon segment 212 connected to each other, and each negative electrode welding ribbon 22 includes a third welding ribbon segment 221 and a fourth welding ribbon segment 222 connected to each other. The first welding ribbon segment 211 and the third welding ribbon segment 221 are both connected to the photovoltaic cell 1, and the second welding ribbon segment 212 and the fourth welding ribbon segment 222 are both located outside the photovoltaic cell 1 and connected to the conductor 31.

[0039] In specific implementations, the positive electrode welding ribbon 21 and the negative electrode welding ribbon 22 are both integrally formed parts, and the shape of the welding ribbon 2 is not specifically limited in the embodiments of the present application. Multiple positive electrode welding ribbons 21 and multiple negative electrode welding ribbons 22 are arranged in a staggered manner along the third direction. When connecting two photovoltaic cells 1, the second welding ribbon segment 212 on one photovoltaic cell 1 and the corresponding fourth welding ribbon segment 222 on the other photovoltaic cell 1 are both connected to the conductor 31. The second welding ribbon segment 212 and the fourth welding ribbon segment 222 can both be located on one side of the photovoltaic cell 1 relative to the conductor 31. That is, the second welding ribbon segment 212, the bus bar 3, and the photovoltaic cell 1 are stacked along the first direction to achieve electrical connection between the two photovoltaic cells 1. This makes the arrangement of the welding ribbons 2 more reasonable, ensuring the photoelectric conversion efficiency of the photovoltaic cell string 100 while making the front of the photovoltaic cell string 100 more beautiful.

[0040] Furthermore, if Figure 1 and Figure 2 As shown, the width of the busbar 3 in the first direction is greater than or equal to the sum of the widths of the second welding ribbon segment 212 and the fourth welding ribbon segment 222. This configuration increases the contact area between the busbar 3 and the second welding ribbon segment 212 and the fourth welding ribbon segment 222, ensuring that both the second welding ribbon segment 212 and the fourth welding ribbon segment 222 can be welded to the busbar 3, thereby improving the connection reliability of the photovoltaic cell string 100.

[0041] According to some embodiments of the present invention, Figure 5 As shown, insulating layer 32 is a black insulating layer. In specific implementations, the material of the black insulating layer includes, but is not limited to, black organic materials or other black insulating materials. Those skilled in the art may select the material based on actual needs, and this embodiment of the present application does not specifically limit this. Since insulating layer 32 is located between two adjacent photovoltaic cells 1, using a black insulating material for insulating layer 32 can give the front of the photovoltaic cell 1 a completely black appearance, improving the appearance consistency of the photovoltaic cell string 100.

[0042] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, a soldering layer 33 is provided on the side of the conductor 31 away from the photovoltaic cell 1. Specifically, the second welding ribbon segment 212 and the fourth welding ribbon segment 222 are both welded to the soldering layer 33. The provision of the soldering layer 33 ensures that the welding ribbon 2 can be securely welded to the busbar 3, thereby improving the reliability of the photovoltaic cell string 100.

[0043] Specifically, the soldering layer 33 is made of a conductive material that can be soldered to the soldering ribbon 2, such as tin, lead, etc. Those skilled in the art can choose according to actual needs, and the embodiment of the present application is not specifically limited here.

[0044] The photovoltaic assembly (not shown) according to the embodiment of the second aspect of the present invention includes the photovoltaic cell string 100 according to the embodiment of the second aspect of the present invention.

[0045] According to the photovoltaic assembly of the embodiment of the present invention, the conductivity of the photovoltaic assembly is improved by adopting the photovoltaic cell string 100, and the power of the photovoltaic assembly is increased.

[0046] Specifically, the photovoltaic modules of the embodiments of the present invention include but are not limited to multi-busbar cell modules, busbar-free cell modules and stacked-grid cell modules.

[0047] Other structures and operations of the photovoltaic assembly according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0051] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic cell string, characterized in that: include: A plurality of photovoltaic cells, wherein the plurality of photovoltaic cells are arranged along a first direction; a plurality of welding strips, each of the welding strips being provided on one side of the plurality of photovoltaic cells in the second direction, the plurality of welding strips being spaced apart along a third direction, each of the welding strips extending along the first direction, the first direction, the second direction, and the third direction being orthogonal to each other; at least one bus bar, the bus bar being provided between two adjacent photovoltaic cells and being provided between the welding ribbon and the photovoltaic cell in the second direction, and the bus bar extending along the third direction; The busbar includes a conductor and an insulating layer. In the second direction, the conductor is located between the welding strip and the photovoltaic cell. The insulating layer is provided on a side of the conductor adjacent to the photovoltaic cell.

2. The photovoltaic cell string according to claim 1, characterized in that: The thickness of the insulating layer in the second direction is smaller than the thickness of the conductor.

3. The photovoltaic cell string according to claim 2, characterized in that: The thickness of the insulating layer in the second direction is D1, and the thickness of the conductor in the second direction is D2, wherein D1 and D2 respectively satisfy: 5um≤D1≤100um, 100um≤D2≤300um.

4. The photovoltaic cell string according to claim 1, characterized in that: The plurality of photovoltaic cells are evenly spaced apart along the first direction, and the width of the bus bar in the first direction is greater than the minimum distance between two adjacent photovoltaic cells.

5. The photovoltaic cell string according to claim 4, characterized in that: The width of the busbar in the first direction is W, wherein W satisfies: 1 mm ≤ W ≤ 10 mm.

6. The photovoltaic cell string according to any one of claims 1 to 5, characterized in that: The plurality of welding strips include a plurality of positive electrode welding strips and a plurality of negative electrode welding strips, and the plurality of positive electrode welding strips and the plurality of negative electrode welding strips are staggered along the third direction; Wherein, each of the positive electrode welding strips includes a first welding strip segment and a second welding strip segment connected to each other, and each of the negative electrode welding strips includes a third welding strip segment and a fourth welding strip segment connected to each other, the first welding strip segment and the third welding strip segment are both connected to the photovoltaic cell sheet, and the second welding strip segment and the fourth welding strip segment are both located on the outside of the photovoltaic cell sheet and connected to the conductor.

7. The photovoltaic cell string according to claim 6, characterized in that: The width of the bus bar in the first direction is greater than or equal to the sum of the widths of the second welding ribbon segment and the fourth welding ribbon segment.

8. The photovoltaic cell string according to claim 1, characterized in that: The insulating layer is a black insulating layer.

9. The photovoltaic cell string according to claim 1, characterized in that: A soldering layer is provided on a side of the conductor away from the photovoltaic cell.

10. A photovoltaic module, characterized in that: The photovoltaic cell string comprises the photovoltaic cell string according to any one of claims 1 to 9.

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