Solar cell and photovoltaic module

Abstract

The utility model relates to a solar cell and a photovoltaic module. The solar cell comprises a cell main body, and a main grid and a fine grid which are arranged on the surface of the cell main body. The main grid extends along a first direction. The main grid comprises a plurality of sub-parts arranged at intervals, each sub-part comprises a plurality of first grid lines arranged at intervals, and the first grid lines extend in the first direction. And the plurality of fine grids are arranged at intervals. The fine grids extend along a second direction, and the second direction is different from the first direction. Each first grid line is connected to the fine grid. In the solar cell, the shading area of the main grid is small, so that the solar cell has high conversion efficiency.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Technology

[0002] Grid lines are a series of metallic lines located on the surface of a solar cell, serving to collect and transport electrons. These grid lines are typically made of silver, aluminum, or other conductive materials and are printed or deposited on the silicon wafer surface of the solar cell. When a solar cell is working, sunlight shines on the silicon wafer, and the silicon material converts light energy into electrical energy, generating electrons and holes. The grid lines' role is to quickly guide these electrons to the edge of the cell so that they can be collected and utilized by external circuitry.

[0003] In traditional solar cell grid structures, the main grid and solder joints have large shading areas, which affects the efficiency of solar cells. Utility Model Content

[0004] Therefore, it is necessary to provide a solar cell and a photovoltaic module. In the solar cell of this application, the shading area of ​​the main grid is small, which enables the solar cell to have a high conversion efficiency.

[0005] In a first aspect, this application provides a solar cell, including a cell body and a main grid and a fine grid disposed on the surface of the cell body;

[0006] The main grid extends along a first direction; the main grid includes a plurality of spaced sub-sections, each sub-section including a plurality of spaced first grid lines, all of which extend along the first direction.

[0007] There are multiple fine grids, which are spaced apart; the fine grids extend along a second direction, which is different from the first direction; each of the first grid lines is connected to the fine grid.

[0008] In some embodiments, in each of the sub-sections, the two ends of each of the first gate lines are connected to different fine gates.

[0009] In some embodiments, the sub-section further includes a second gate line, wherein the second gate line is disposed in a region between at least one set of two adjacent first gate lines in the sub-section.

[0010] In some embodiments, there are multiple second gate lines, which are spaced apart along the first direction.

[0011] In some embodiments, each of the second gate lines is connected to two different first gate lines.

[0012] In some embodiments, the solar cell further includes fine grid connecting lines disposed on the surface of the cell body, the fine grid connecting lines being used to connect different fine grids.

[0013] In some embodiments, there are multiple main gates, which are spaced apart; and the multiple sub-sections are arranged in a row-column pattern.

[0014] In some embodiments, the solar cell further includes a frame grid line disposed on the surface of the cell body. The frame grid line is annular and surrounds the periphery of the main grid and the fine grids. Each fine grid is connected to the frame grid line.

[0015] Secondly, this application provides a photovoltaic module, including a plurality of solar cells as described in any one of the above claims and a solder strip, wherein the solder strip is used to connect different solar cells; the solder strip is electrically connected to the sub-module.

[0016] In some embodiments, the photovoltaic module further includes an insulating adhesive; the insulating adhesive is disposed on the surface of the battery body and is used to fix the solder ribbon to the surface of the battery body.

[0017] The aforementioned solar cell includes a cell body and a main grid and fine grids disposed on the surface of the cell body. The main grid extends along a first direction and includes multiple spaced sub-sections. The main grid in this solar cell is discontinuous, meaning it is not as continuous as a traditional main grid. This design results in a smaller shading area on the cell body compared to a traditional continuous main grid, which improves the solar cell's conversion efficiency. Simultaneously, each sub-section includes multiple spaced first grid lines. The spaced first grid lines in each sub-section also reduce the shading area of ​​the main grid on the cell body, further improving the solar cell's conversion efficiency. Furthermore, since all the first grid lines extend along the first direction, they can still form a single main grid, facilitating the connection of the solar cell via solder ribbons, allowing electrical connection between the solder ribbons and the first grid lines in the sub-sections. In this solar cell, the smaller shading area of ​​the main grid enables the solar cell to achieve higher conversion efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a solar cell provided in one embodiment of this application;

[0019] Figure 2 A schematic diagram of the structure of a sub-section of the main gate provided in one embodiment of this application;

[0020] Figure 3 This is a partial structural schematic diagram of a photovoltaic module provided in one embodiment of this application.

[0021] Explanation of reference numerals in the attached figures

[0022] 1. Battery body; 2. Main grid; 3. Sub-grid; 4. First grid line; 5. Second grid line; 6. Fine grid; 7. Fine grid connecting line; 8. Frame grid line; 9. Welding strip; 10. Insulating adhesive. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Reference Figure 1 and Figure 2 As shown, one embodiment of this application provides a solar cell, including a cell body 1, and a main grid 2 and fine grids 6 disposed on the surface of the cell body 1. The main grid 2 extends along a first direction. The main grid 2 includes a plurality of spaced-apart sub-parts 3, each sub-part 3 including a plurality of spaced-apart first grid lines 4, all of which extend along the first direction. There are a plurality of fine grids 6, which are spaced-apart. The fine grids 6 extend along a second direction, which is different from the first direction. Each first grid line 4 is connected to a fine grid 6.

[0029] The aforementioned solar cell includes a cell body 1, and a main grid 2 and fine grids 6 disposed on the surface of the cell body 1. The main grid 2 extends along a first direction and includes multiple spaced sub-sections 3. The main grid 2 is discontinuous, meaning it is intermittent compared to a conventional continuous main grid 2. This design reduces the shading area of ​​the main grid 2 on the cell body 1, thus improving the solar cell's conversion efficiency. Simultaneously, each sub-section 3 includes multiple spaced first grid lines 4. The spaced first grid lines 4 in each sub-section 3 also reduce the shading area of ​​the main grid 2 on the cell body 1, further improving the solar cell's conversion efficiency. Furthermore, since all the first grid lines 4 extend along the first direction, they can still form a single main grid, facilitating the connection of the solar cell via solder ribbons, allowing electrical connection between the solder ribbons and the first grid lines 4 in the sub-sections 3. In this application, the small shading area of ​​the main grid enables the solar cell to achieve higher conversion efficiency.

[0030] For example, refer again Figure 1 As shown, Figure 1 The X direction is the first direction, and the Y direction is the second direction.

[0031] In some implementations, the first direction and the second direction are perpendicular.

[0032] In some embodiments, in each sub-section 3, the two ends of each first grid line 4 are connected to different fine grids 6.

[0033] In some embodiments, the sub-section 3 further includes a second grid line 5, wherein the second grid line 5 is disposed in the region between at least one set of two adjacent first grid lines 4 in the sub-section 3.

[0034] Understandably, a second grid line 5 is provided in the area between at least one pair of adjacent first grid lines 4 in the sub-part 3. The second grid line 5 facilitates welding with the solder strip 9. The second grid line 5 can be connected to the first grid line 4 or spaced apart from it. The second grid line 5 can be straight or other shapes.

[0035] In some embodiments, in each sub-section 3, each second gate line 5 is arranged in parallel at intervals and extends along the second direction.

[0036] In some embodiments, there are multiple second gate lines 5, which are spaced apart along a first direction.

[0037] Multiple second gate lines 5 are spaced apart along the first direction to facilitate the electrical connection between the solder strip 9 and the main gate 2.

[0038] In some embodiments, in each main gate 2, each sub-section 3 is distributed at equal intervals along a first direction.

[0039] In some embodiments, each second gate line 5 is connected to two different first gate lines 4.

[0040] In some embodiments, the solar cell also includes fine grid connection lines 7 disposed on the surface of the cell body 1, the fine grid connection lines 7 being used to connect different fine grids 6.

[0041] By connecting different fine grids 6 through the fine grid connection line 7, more current transmission channels can be provided, and the current transmission path can be shortened, making it convenient for current to be combined.

[0042] In some embodiments, the fine grid connecting line 7 is used to connect adjacent fine grids 6 that are not connected through the sub-section 3.

[0043] In some embodiments, there are multiple main gates 2, which are spaced apart. Multiple sub-sections 3 are arranged in a row and column pattern.

[0044] Multiple main gates 2 are spaced apart, and multiple sub-gates 3 are arranged in a row and column pattern, which can provide more current transmission channels and shorten the current transmission path, making it convenient for current to be combined.

[0045] In some embodiments, multiple main gates 2 are distributed at equal intervals along a second direction.

[0046] In some embodiments, a plurality of fine grids 6 are distributed at equal intervals along a first direction.

[0047] In some embodiments, the fine grid connecting lines 7 are distributed at equal intervals in the first direction.

[0048] In some embodiments, the fine grid connecting lines 7 are evenly spaced in the second direction.

[0049] In some embodiments, the solar cell also includes a frame grid line 8 disposed on the surface of the cell body 1. The frame grid line 8 is annular and surrounds the main grid 2 and the fine grid 6. Each fine grid 6 is connected to the frame grid line 8.

[0050] The ring-shaped frame grid line 8 surrounds the main grid 2 and the fine grid 6, and each fine grid 6 is connected to the frame grid line 8, which facilitates current collection, provides more current transmission channels, and shortens the current transmission path.

[0051] In some embodiments, the linewidth of the fine gate 6 is 2μm to 200μm.

[0052] Optionally, the linewidth of the fine gate 6 is 2μm, 5μm, 10μm, 20μm, 30μm, 40μm, 60μm, 80μm, 100μm, 120μm, 140μm, 160μm, 180μm or 200μm, or the linewidth of the fine gate 6 may be within the range of any two of the above widths.

[0053] In some embodiments, the distance between adjacent fine grids 6 is 10 μm to 2000 μm.

[0054] Optionally, the distance between adjacent fine gates 6 can be 10μm, 20μm, 30μm, 50μm, 100μm, 200μm, 300μm, 500μm, 800μm, 1000μm, 1500μm or 2000μm, or the distance between adjacent fine gates 6 can be within any two of the above distances.

[0055] In some embodiments, the linewidth of the fine gate connection line 7 is 2μm to 200μm.

[0056] Optionally, the linewidth of the fine gate connection line 7 is 2μm, 5μm, 10μm, 20μm, 30μm, 40μm, 60μm, 80μm, 100μm, 120μm, 140μm, 160μm, 180μm or 200μm, or the linewidth of the fine gate connection line 7 can be within the range of any two of the above widths.

[0057] In some embodiments, the length of the fine gate connection line 7 is 10 μm to 2000 μm.

[0058] Optionally, the length of the fine gate connection line 7 is 10μm, 20μm, 30μm, 50μm, 100μm, 200μm, 300μm, 500μm, 800μm, 1000μm, 1500μm or 2000μm, or the length of the fine gate connection line 7 may be within any two of the above lengths.

[0059] In some embodiments, the linewidth of the first gate line 4 is 1 μm to 50 μm.

[0060] Optionally, the linewidth of the first gate line 4 is 1μm, 2μm, 5μm, 8μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm or 50μm, or the linewidth of the first gate line 4 can be within the range of any two of the above widths.

[0061] In some embodiments, in each subsection 3, the distance between two adjacent first gate lines 4 is 1 μm to 100 μm.

[0062] Optionally, in each sub-section 3, the distance between two adjacent first gate lines 4 is 1μm, 2μm, 5μm, 10μm, 15μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, or 100μm. Alternatively, in each sub-section 3, the distance between two adjacent first gate lines 4 may also be within the range of any two of the above distances.

[0063] In some embodiments, in each subsection 3, the distance between two adjacent second gate lines 5 is 1 μm to 10 μm.

[0064] Optionally, in each sub-section 3, the distance between two adjacent second gate lines 5 is 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm, or the distance between two adjacent second gate lines 5 in each sub-section 3 may be within the range of any two of the above distances.

[0065] Reference Figure 3 As shown, another embodiment of this application provides a photovoltaic module, including a plurality of solar cells as described above and a solder strip 9, the solder strip 9 being used to connect different solar cells. The solder strip 9 is electrically connected to the sub-section 3.

[0066] In some embodiments, each solar cell has a one-to-one correspondence between the solder strip 9 and the main grid 2.

[0067] It is understandable that the one-to-one correspondence between the solder strip 9 and the main grid 2 means that the number of solder strips 9 and main grid 2 located on the same surface of the battery body 1 is the same, and each solder strip 9 and a main grid 2 form an electrical connection.

[0068] In some embodiments, each solder strip 9 and all sub-sections 3 in a main gate 2 are electrically connected.

[0069] In some embodiments, the photovoltaic module further includes an insulating adhesive 10. The insulating adhesive 10 is disposed on the surface of the cell body 1 and is used to fix the solder ribbon 9 to the surface of the cell body 1.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A solar cell, characterized by, The solar cell comprises a battery body (1), a main grid (2) and a fine grid (6) arranged on the surface of the battery body (1); The main grid (2) extends along a first direction; the main grid (2) comprises a plurality of sub-parts (3) arranged at intervals, and each of the sub-parts (3) comprises a plurality of first grid lines (4) arranged at intervals, each of the first grid lines (4) extending along the first direction; The fine grid (6) is in plurality, and the fine grids (6) are arranged at intervals; the fine grid (6) extends along a second direction, and the second direction is different from the first direction; each of the first grid lines (4) is connected to the fine grid (6).

2. The solar cell according to claim 1, characterized in that, In each of the sub-parts (3), both ends of each of the first grid lines (4) are connected to different fine grids (6).

3. The solar cell according to claim 1, characterized in that, The sub-part (3) further comprises a second grid line (5), and the second grid line (5) is arranged in the region between at least one group of two adjacent first grid lines (4) in the sub-part (3).

4. The solar cell according to claim 3, characterized in that, The second grid line (5) is in plurality, and the second grid lines (5) are distributed at intervals along the first direction.

5. The solar cell according to claim 3, characterized in that, Each of the second grid lines (5) is connected to two different first grid lines (4).

6. The solar cell according to any one of claims 1 to 5, wherein The solar cell further comprises a fine grid connecting line (7) arranged on the surface of the battery body (1), and the fine grid connecting line (7) is used for connecting different fine grids (6).

7. The solar cell according to any one of claims 1 to 5, wherein The main grid (2) is in plurality, and the main grids (2) are distributed at intervals; the plurality of sub-parts (3) are distributed in a matrix form.

8. The solar cell according to any one of claims 1 to 5, wherein The solar cell further comprises a frame grid line (8) arranged on the surface of the battery body (1), the frame grid line (8) is annular, the frame grid line (8) is arranged around the periphery of the main grid (2) and the fine grid (6), and each of the fine grids (6) is connected to the frame grid line (8).

9. A photovoltaic module, characterized by, The photovoltaic module further comprises a solder strip (9) used for connecting different solar cells, and the solder strip (9) is electrically connected to the sub-part (3).

10. The photovoltaic module of claim 9, wherein, The photovoltaic module further comprises an insulating adhesive (10) arranged on the surface of the battery body (1), and the insulating adhesive (10) is used for fixing the solder strip (9) on the surface of the battery body (1).

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