Solar cell, solar cell string and photovoltaic module

Abstract

The present application discloses a battery cell, a battery string and a photovoltaic module, belonging to the technical field of photovoltaic modules. It includes: a battery cell, on the surface of which there are a plurality of fine grid lines extending along a first direction and arranged at intervals along a second direction; a plurality of first glue dot columns, each first glue dot column extending along the second direction, and the plurality of first glue dot columns arranged at intervals along the first direction; each first glue dot column includes a plurality of glue dots, and each glue dot is arranged between two adjacent fine grid lines; the plurality of fine grid lines include a plurality of first fine grids, and each first fine grid is provided with a plurality of thickened segments; the glue dots include first glue dots, and the first glue dots are located between two adjacent first fine grids; in the arrangement area of each first glue dot column, along the second direction, on both sides of each first glue dot, there is at most one thickened segment at the position where two adjacent first fine grids are adjacent to the first glue dot, and in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a manner of being projected and misaligned along the first direction.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic modules, and particularly relates to a solar cell, a solar cell string and a photovoltaic module. Background Art

[0002] A solar cell string is a core component of a photovoltaic module, and the solar cell string can convert solar energy into electrical energy. Among them, the solar cell string includes a plurality of solar cells arranged in sequence, and a plurality of fine grids are arranged on the surface of the solar cell along a first direction. Usually, by means of screen printing, metal paste is printed on the surface of the solar cell to form a plurality of fine grids arranged along the first direction on the surface of the solar cell, so as to collect the current generated on the surface of the solar cell through the plurality of fine grids. A plurality of solder tapes are laid on the surface of the solar cell along a second direction, and each solder tape is respectively cross-connected with the plurality of fine grids to collect the current collected by the fine grids through the plurality of solder tapes.

[0003] However, during the lamination process of the solar cell string, due to the poor weldability of the fine grid paste, the contact between the solder tape and the fine grid is poor. It is easy for the solder tape and the fine grid to come off, thereby affecting the photoelectric conversion efficiency of the solar cell and making the reliability of the solar cell unable to meet the requirements. Summary of the Invention

[0004] The present application provides a solar cell, a solar cell string and a photovoltaic module to solve or at least partially solve the problem existing in the prior art that during the lamination process of the solar cell string, due to the poor weldability of the fine grid paste, the contact between the solder tape and the fine grid is poor. It is easy for the solder tape and the fine grid to come off, thereby affecting the photoelectric conversion efficiency of the solar cell and making the reliability of the solar cell unable to meet the requirements.

[0005] To solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, the present application discloses a battery string, including: battery cells, on the surface of which there are multiple fine grid lines extending in a first direction and arranged at intervals in a second direction perpendicular to the first direction; multiple first glue dot columns, each of which extends in the second direction, and the multiple first glue dot columns are arranged at intervals in the first direction; each of the first glue dot columns includes multiple glue dots, and each of the glue dots is disposed between two adjacent fine grid lines; the multiple fine grid lines include multiple first fine grid lines, and each of the first fine grid lines is provided with multiple thickened segments; the glue dots include first glue dots, and the first glue dots are located between two adjacent first fine grid lines; in the arrangement area of each first glue dot column, along the second direction, on both sides of each first glue dot, there is at most one thickened segment at the position where two adjacent first fine grid lines are adjacent to the first glue dot; in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grid lines are arranged in a manner that their projections along the first direction are misaligned.

[0007] Optionally, in the arrangement area of the first glue dot column, along the second direction, there are N first fine grid lines without thickened segments spaced between every M first fine grid lines with thickened segments, where both M and N are integers greater than or equal to 1.

[0008] Optionally, the battery cell includes a first edge and a second edge opposite to each other in the second direction; the fine grid lines further include: multiple second fine grid lines, where the multiple second fine grid lines are disposed in the areas between the first fine grid lines and the first edge and between the first fine grid lines and the second edge; the second fine grid lines are closer to the first edge and the second edge than the first fine grid lines; the second fine grid lines are provided with multiple thickened segments along the first direction.

[0009] Optionally, the battery cell further includes: multiple second glue dot columns, each of which extends in the second direction, the multiple second glue dot columns are arranged at intervals in the first direction, each of the second glue dot columns includes multiple glue dots, and each of the glue dots is disposed between two adjacent fine grid lines; in the arrangement area of the second glue dot column, along the center line of the second glue dot column, each of the first fine grid lines and each of the second fine grid lines are provided with thickened segments.

[0010] Optionally, the cell includes a third edge and a fourth edge opposite to each other along the first direction, wherein the plurality of first glue dot columns are disposed between the third edge and the fourth edge; at least one of the second glue dot columns is disposed at a position between the plurality of first glue dot columns and the third edge, at least one of the second glue dot columns is disposed at a position between the plurality of first glue dot columns and the fourth edge, and at least one of the second glue dot columns is disposed at a central position of the plurality of first glue dot columns.

[0011] Optionally, when the sum of the number of the first glue dot columns and the number of the second glue dot columns is odd, the number of the second glue dot columns disposed at the central position of the first glue dot columns is 1 or 3; when the sum of the number of the first glue dot columns and the number of the second glue dot columns is even, the number of the second glue dot columns disposed at the central position of the first glue dot columns is 2 or 4.

[0012] Optionally, the fine grid lines further include: a plurality of third fine grid lines, wherein the plurality of third fine grid lines are disposed in the regions between the first fine grid line and the first edge and between the first fine grid line and the second edge; the plurality of third fine grid lines are disposed between two of the second fine grid lines, and along the second direction, no second fine grid line is disposed between the plurality of third fine grid lines.

[0013] Optionally, in the arrangement region of the first glue dot columns and the second glue dot columns, along the center line of the first glue dot columns and the second glue dot columns, no bold segment is provided on each of the third fine grid lines.

[0014] Optionally, no bold segment is provided on the third fine grid lines.

[0015] Optionally, in the arrangement region of the first glue dot columns and the second glue dot columns, along the center line of the first glue dot columns and the second glue dot columns, a bold segment is provided on each of the second fine grid lines.

[0016] Optionally, the first glue dot columns and the second glue dot columns include a plurality of second glue dots, the second glue dots are located between adjacent second fine grid lines and third fine grid lines, and / or the second glue dots are located between adjacent two of the third fine grid lines, wherein at least one of the second glue dots partially covers the third fine grid lines.

[0017] Optionally, the glue dots closest to the first edge and the second edge on the cell are third glue dots, and the size of each third glue dot is larger than the size of the other glue dots.

[0018] Optionally, the surface of the cell includes a first surface and a second surface, wherein the projection of the glue dot located on the first surface in the direction perpendicular to the cell is misaligned with the projection of the glue dot located on the second surface in the direction perpendicular to the cell.

[0019] Optionally, the surface of the cell includes a first surface and a second surface, wherein the projection of the glue dot located on the first surface in the direction perpendicular to the cell at least partially overlaps with the projection of the glue dot located on the second surface in the direction perpendicular to the cell.

[0020] Optionally, along the second direction, the distance between two adjacent thin grid lines is L, and the length of the glue dot is L 1 , where 0.6L ≤ L 1 ≤ 0.9L.

[0021] Optionally, along the second direction, the distance L between the glue dot and the adjacent thickened section 2 , where L 2 ≥ 0.15L.

[0022] Optionally, the surface of the cell includes a first surface and a second surface, wherein for the first thin grid located on the first surface, M = 1 or 2, and N = 1 or 2; and / or, for the first thin grid located on the second surface, M = 1 or 2, and N = 1 or 2.

[0023] Optionally, the cell includes a cell without a main grid.

[0024] Optionally, multiple main grids extending along the second direction and arranged at intervals along the first direction are provided on the surface of the cell; each glue dot is located above the multiple main grids.

[0025] Optionally, the size of the cell includes: (182 ± 2) mm * (96 ± 1) mm, (192 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (105 ± 1) mm.

[0026] Optionally, the cell includes one of a heterojunction cell, a monocrystalline silicon cell, a polycrystalline silicon cell, an amorphous silicon cell, a copper indium gallium selenide cell, a gallium arsenide cell, a cadmium telluride cell, a polymer cell.

[0027] Optionally, the glue dot includes a non-conductive glue dot.

[0028] Second aspect, the present application discloses a battery string, the battery string including at least two battery cells as described in the first aspect; connection lines, the connection lines electrically connecting at least two of the battery cells.

[0029] Optionally, the surface of the battery cell includes a first surface and a second surface, wherein the connection line passes through the gap between two adjacent battery cells, a part of which is electrically connected to the first surface of one battery cell, and another part is electrically connected to the second surface of another battery cell.

[0030] Optionally, there are multiple connection lines, the multiple connection lines extending along the second direction and being arranged at intervals along the first direction.

[0031] Optionally, the connection line is connected to the surface of the battery cell through the glue dots.

[0032] Third aspect, the present application discloses a photovoltaic module, including: a plurality of battery strings as described in the second aspect, the battery strings being multiple and arranged at intervals.

[0033] The present application discloses a battery cell, a battery string and a photovoltaic module. The battery cell includes: a battery cell, on the surface of which there are multiple fine grid lines extending along a first direction and arranged at intervals along a second direction, the second direction being perpendicular to the first direction; a plurality of first glue dot columns, each first glue dot column extending along the second direction, the plurality of first glue dot columns being arranged at intervals along the first direction; each first glue dot column including a plurality of glue dots, each glue dot being disposed between two adjacent fine grid lines; the multiple fine grid lines including multiple first fine grids, on each first fine grid there being a plurality of thickened segments; the glue dots including first glue dots, the first glue dots being located between two adjacent first fine grids; in the arrangement area of each first glue dot column, along the second direction, on both sides of each first glue dot, there is at most one thickened segment at the position where two adjacent first fine grids are adjacent to the first glue dot; in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a manner that their projections along the first direction are misaligned.

[0034] The solar cell disclosed in the present application has multiple thickened segments provided on each first fine grid, and the first glue dots are arranged between two first fine grids. In the arrangement area of each first glue dot column, along the second direction, at most one thickened segment is provided at the position where two adjacent first fine grids are adjacent to the first glue dot on both sides of each first glue dot. Thus, a connecting wire can be bonded to the surface of the solar cell through each first glue dot column, and the connecting wire is connected to the first fine grid through the thickened segment. During the lamination process of the solar cell, the contact between the connecting wire and the first fine grid is good, and it is not easy for the connecting wire to separate from the first fine grid, thereby improving the photoelectric conversion efficiency and reliability of the solar cell.

[0035] Moreover, in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grid are arranged in a way that their projections along the first direction are offset. Two connecting wires are bonded to the surface of the solar cell through two adjacent first glue dot columns, and the thickened segments on the first fine grids corresponding to the two adjacent first glue dot columns are arranged in a way that their projections along the first direction are offset. Thus, with a reduced number of thickened segments, two adjacent connecting wires can be better connected to multiple first fine grids through the thickened segments whose projections along the first direction are offset, further improving the reliability of the contact between the connecting wire and the first fine grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram showing the structure of the solar cell described in the embodiment of the present application Figure 1 ;

[0037] Figure 2 Partial enlarged view C-C of the solar cell described in the embodiment of the present application;

[0038] Figure 3 Partial enlarged view D-D of the solar cell described in the embodiment of the present application;

[0039] Figure 4 Partial enlarged view E-E of the solar cell described in the embodiment of the present application;

[0040] Figure 5 Schematic diagram showing the structure of the solar cell described in the embodiment of the present application Figure 2 ;

[0041] Figure 6 Schematic diagram showing the structure of the solar cell string described in the embodiment of the present application;

[0042] Figure 7 Schematic diagram showing the structure of the thickened segment described in the embodiment of the present application;

[0043] Reference numerals:

[0044] 10: Solar cell; 11: First edge; 12: Second edge; 13: Third edge; 14: Fourth edge; 15: First surface; 16: Second surface;

[0045] 20: Fine grid line; 21: First fine grid; 22: Second fine grid; 23: Third fine grid;

[0046] 30: Thickened section;

[0047] 40: First column of adhesive dots; 41: Second column of adhesive dots; 43: Adhesive dot; 44: First adhesive dot; 45: Second adhesive dot; 46: Third adhesive dot;

[0048] 50: Connecting line;

[0049] A: First direction; B: Second direction. Detailed implementation manner

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present invention.

[0051] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0052] Refer to Figure 1 , which shows the structural schematic diagram of the solar cell in the embodiment of the present application Figure 1 ; Refer to Figure 2 , which shows the partial enlarged view C-C of the solar cell in the embodiment of the present application; Refer to Figure 3 , which shows the partial enlarged view D-D of the solar cell in the embodiment of the present application; Refer to Figure 4 , which shows the partial enlarged view E-E of the solar cell in the embodiment of the present application; Refer to Figure 5 , which shows the structural schematic diagram of the solar cell in the embodiment of the present application Figure 2 .

[0053] As Figures 1 to 5As shown in the figure, the solar cell disclosed in the present application includes: a solar cell 10, on the surface of the solar cell 10, there are provided a plurality of fine grid lines 20 extending along a first direction A and spaced apart along a second direction B, the second direction B being perpendicular to the first direction A; a plurality of first glue dot columns 40, each first glue dot column 40 extending along the second direction B, and the plurality of first glue dot columns 40 being spaced apart along the first direction A; each first glue dot column 40 includes a plurality of glue dots 43, each glue dot 43 being disposed between two adjacent fine grid lines 20; the plurality of fine grid lines 20 include a plurality of first fine grid lines 21, and a plurality of thickened segments 30 are provided on each first fine grid line 21; the glue dot 43 includes a first glue dot 44, the first glue dot 44 being located between two adjacent first fine grid lines 21; in the arrangement area of each first glue dot column 40, along the second direction B, on both sides of each first glue dot 44, there are at most one thickened segment 30 in total at the positions where two adjacent first fine grid lines 21 are adjacent to the first glue dot 44; in the arrangement areas of two adjacent first glue dot columns 40, the thickened segments 30 of the first fine grid line 21 are arranged in a manner that their projections along the first direction A are offset.

[0054] As Figures 1 to 5 As shown in the figure, the solar cell disclosed in the embodiment of the present application includes a solar cell 10. The solar cell 10 is a core component of a photovoltaic module, which can convert solar energy into electrical energy. On the surface of the solar cell 10, there are provided a plurality of fine grid lines 20 extending along a first direction A and spaced apart along a second direction B. The current generated by the solar cell 10 is collected through the plurality of fine grid lines 20.

[0055] Specifically, in the process of manufacturing a photovoltaic module, the metal paste can be printed on the surface of the solar cell 10 by means of screen printing to form a plurality of fine grid lines 20 extending along the first direction A and spaced apart along the second direction B on the surface of the solar cell 10, so as to collect the current generated by the solar cell 10 through the plurality of fine grid lines 20. Among them, the fine grid lines 20 have electrical conductivity.

[0056] As Figures 1 to 5 As shown in the figure, on the surface of the solar cell 10, there are provided a plurality of first glue dot columns 40. Each first glue dot column 40 extends along the second direction B, and the plurality of first glue dot columns 40 are spaced apart along the first direction A. Among them, each first glue dot column 40 includes a plurality of glue dots 43 spaced apart along the second direction B, and each glue dot 43 is disposed between two adjacent fine grid lines 20.

[0057] It should be noted that the plurality of first glue dot columns 40 in the embodiment of the present application are used to connect a plurality of connecting lines 50 to the surface of the solar cell 10, so that each connecting line 50 is electrically connected to the plurality of fine grid lines 20, thereby collecting the current collected by the plurality of fine grid lines 20 through the plurality of connecting lines 50. Among them, the connecting line 50 has electrical conductivity. Exemplarily, the connecting line 50 can be a solder ribbon, a welding rod, etc.

[0058] Specifically, during the processing of the photovoltaic module, after printing multiple fine grid lines 20 on the surface of the cell 10, a screen printing method can be used to print and form multiple first glue dot columns 40 on the surface of the cell 10, which extend along the second direction B and are arranged at intervals along the first direction A. Each first glue dot column 40 includes multiple glue dots 43 arranged at intervals along the second direction B.

[0059] Among them, the multiple fine grid lines 20 include multiple first fine grids 21, and multiple thickening segments 30 are arranged on each first fine grid 21. The thickening segment 30 has conductivity. The metal paste can be printed on the first fine grid 21 by screen printing to form multiple thickening segments 30 on the first fine grid 21.

[0060] Optionally, the fine grid lines 20 can also be formed by laser transfer, sputtering, deposition and other methods.

[0061] Among them, the glue dot 43 includes a first glue dot 44, and the first glue dot 44 is arranged between two adjacent first fine grids 21. The glue dot 43 does not have conductivity. In the embodiment of the present application, the first glue dot 44 is arranged between two adjacent first fine grids 21 to prevent the arrangement of the first fine grid 21 from affecting the electrical connection between the first fine grid 21 and the connection line 50.

[0062] As Figures 1 to 3 shown, in the embodiment of the present application, in the arrangement area of each first glue dot column 40, that is, a column area that runs through the entire cell 10 along the second direction B. Along the second direction B, on both sides of each first glue dot 44, at most one thickening segment 30 is arranged at the position where two adjacent first fine grids 21 are adjacent to the first glue dot 44.

[0063] That is to say, along the second direction B, one thickening segment 30 is arranged at the position where two first fine grids 21 adjacent to the first glue dot 44 are adjacent to the first glue dot 44, or no thickening segment 30 is arranged at the position where two first fine grids 21 adjacent to the first glue dot 44 are adjacent to the first glue dot 44.

[0064] In the embodiment of the present application, by arranging at most one thickening segment 30 at the position where two adjacent first fine grids 21 are adjacent to the first glue dot 44 on both sides of each first glue dot 44 along the second direction B in the arrangement area of each first glue dot column 40. Thus, a connection line 50 can be bonded to the surface of the cell 10 through each first glue dot column 40, and the connection line 50 is connected to the first fine grid 21 through the thickening segment 30. During the lamination of the cell, the contact between the connection line 50 and the first fine grid 21 is good, and it is not easy for the connection line 50 to separate from the first fine grid 21, thereby improving the photoelectric conversion efficiency and reliability of the cell.

[0065] As Figures 1 to 3As shown, in the arrangement regions of two adjacent first glue dot columns 40, the thickened segments 30 of the first fine grids 21 are arranged in a manner that their projections along the first direction A are offset. Two connection lines 50 are bonded to the surface of the battery cell 10 through two adjacent first glue dot columns 40. The thickened segments 30 on the first fine grids 21 corresponding to the two adjacent first glue dot columns 40 are arranged in a manner that their projections along the first direction A are offset. Thus, with the reduced number of thickened segments 30 provided, the two adjacent connection lines 50 can be better connected to multiple first fine grids 21 through multiple thickened segments 30 with offset projections along the first direction A, further improving the reliability of the contact between the connection line 50 and the first fine grid 21.

[0066] Optionally, as Figures 1 to 6 shown, in the arrangement region of the first glue dot column 40, along the second direction B, between every M first fine grids 21 with thickened segments 30, N first fine grids 21 without thickened segments 30 are spaced, where both M and N are integers greater than or equal to 1.

[0067] As Figures 1 to 6 shown, in the embodiment of the present application, in the arrangement region of the first glue dot column 40, that is, a column region running through the entire battery cell 10 along the second direction B. Along the second direction B, between every M first fine grids 21 with thickened segments 30, N first fine grids 21 without thickened segments 30 are spaced.

[0068] For example, in the arrangement region of the first glue dot column 40, along the second direction B, between every first fine grid 21 with a thickened segment 30, one first fine grid 21 without a thickened segment 30 is spaced. Again, for example, in the arrangement region of the first glue dot column 40, along the second direction B, between every two first fine grids 21 with thickened segments 30, two first fine grids 21 without thickened segments 30 are spaced. Also, for example, in the arrangement region of the first glue dot column 40, along the second direction B, between every first fine grid 21 with a thickened segment 30, two first fine grids 21 without thickened segments 30 are spaced.

[0069] Of course, the above are only several specific implementation manners of the embodiment of the present application and do not limit the embodiment of the present application. In actual use, those skilled in the art can set the values of M and N according to needs.

[0070] In the embodiment of the present application, in the arrangement region of the first glue dot column 40, along the second direction B, by spacing N first fine grids 21 without thickened segments 30 between every M first fine grids 21 with thickened segments 30. Thus, while ensuring the contact reliability between the connection line 50 and the first fine grid 21, the number of thickened segments 30 provided is further reduced to lower the production cost of the battery cell.

[0071] Optionally, as Figure 1 shown, the cell includes a first edge 11 and a second edge 12 opposite to each other along the second direction B; the fine grid line 20 further includes: a plurality of second fine grids 22, wherein the plurality of second fine grids 22 are disposed in the regions between the first fine grid 21 and the first edge 11 and between the first fine grid 21 and the second edge 12; the second fine grids 22 are closer to the first edge 11 and the second edge 12 than the first fine grid 21; and a plurality of thickened segments 30 are disposed along the first direction A on the second fine grids 22.

[0072] As Figure 1 shown, the fine grid line 20 in the embodiment of the present application further includes a plurality of second fine grids 22. The plurality of second fine grids 22 are disposed in the regions between the first fine grid 21 and the first edge 11 of the cell 10 and between the first fine grid 21 and the second edge 12 of the cell 10. Moreover, the second fine grids 22 are closer to the first edge 11 and the second edge 12 than the first fine grid 21.

[0073] Wherein, a plurality of thickened segments 30 are disposed along the first direction A on the second fine grids 22, so that the connection line 50 is connected to the plurality of second fine grids 22 through the plurality of thickened segments 30, thereby enabling good contact between the connection line 50 and the second fine grids 22 and preventing the connection line 50 from being easily detached from the second fine grids 22, thereby improving the photoelectric conversion efficiency and reliability of the cell 10.

[0074] Optionally, as Figure 1 、 Figure 5 and Figure 6 shown, the cell further includes: a plurality of second glue dot columns 41, each second glue dot column 41 extends along the second direction B, the plurality of second glue dot columns 41 are arranged at intervals along the first direction A, each second glue dot column 41 includes a plurality of glue dots 43, and each glue dot 43 is disposed between two adjacent fine grid lines 20; in the arrangement region of the second glue dot columns 41, along the center line of the second glue dot columns 41, a thickened segment 30 is disposed on each first fine grid 21 and each second fine grid 22.

[0075] In the embodiment of the present application, in the arrangement area of the second glue dot column 41, that is, a column area running through the entire solar cell 10 along the second direction B. Along the center line of the second glue dot column 41, that is, on the straight line formed by the projection of a plurality of glue dots 43 in the second glue dot column 41 along the direction perpendicular to the plane where the solar cell 10 is located, a thickening section 30 is provided on each first fine grid 21 and each second fine grid 22. A connection line 50 is bonded to the surface of the solar cell 10 through each second glue dot column 41, so that the connection line 50 is connected to each first fine grid 21 and each second fine grid 22 through the thickening section 30. During the lamination process of the solar cell, it is ensured that good contact is made between the connection line 50 and each first fine grid 21 and each second fine grid 22, so that the connection line 50 is not easily separated from the first fine grid 21 and the second fine grid 22, thereby improving the photoelectric conversion efficiency of the solar cell 10 and the reliability of the solar cell 10 in the arrangement area of the second glue dot column 41.

[0076] Optionally, as Figure 1 , Figure 5 and Figure 6 shown, the solar cell 10 includes a third edge 13 and a fourth edge 14 opposite to each other along the first direction A, wherein a plurality of first glue dot columns 40 are arranged between the third edge 13 and the fourth edge 14; at least one second glue dot column 41 is arranged at a position between the plurality of first glue dot columns 40 and the third edge 13, at least one second glue dot column 41 is arranged at a position between the plurality of first glue dot columns 40 and the fourth edge 14, and at least one second glue dot column 41 is arranged at the central position of the plurality of first glue dot columns 40.

[0077] As Figure 1 shown, 18 glue dot columns can be arranged between the third edge 13 and the fourth edge 14 of the solar cell 10, including 14 first glue dot columns 40 and 4 second glue dot columns 41. One second glue dot column 41 is arranged at a position between the 14 first glue dot columns 40 and the third edge 13, one second glue dot column 41 is arranged at a position between the 14 first glue dot columns 40 and the fourth edge 14, and two second glue dot columns 41 are arranged at the central position of the 14 first glue dot columns 40.

[0078] Of course, the above is only an example of the number and arrangement method of the first glue dot column 40 and the second glue dot column 41, and does not limit the present application. In actual use, those skilled in the art can arrange the first glue dot column 40 and the second glue dot column 41 on the surface of the solar cell 10 as needed.

[0079] Optionally, when the sum of the number of the first glue dot columns 40 and the number of the second glue dot columns 41 is odd, the number of the second glue dot columns 41 disposed at the central position of the first glue dot column 40 is 1 or 3; when the sum of the number of the first glue dot columns 40 and the number of the second glue dot columns 41 is even, the number of the second glue dot columns 41 disposed at the central position of the first glue dot column 40 is 2 or 4.

[0080] In an embodiment of the present application, when the sum of the number of the first glue dot columns 40 and the number of the second glue dot columns 41 is odd, the number of the second glue dot columns 41 disposed at the central position of the first glue dot column 40 is set to 1 or 3. When the sum of the number of the first glue dot columns 40 and the number of the second glue dot columns 41 is even, the number of the second glue dot columns 41 disposed at the central position of the first glue dot column 40 is 2 or 4. So that the first glue dot columns 40 and the second glue dot columns 41 on the battery cell 10 are symmetrically disposed along the center line of the battery cell 10, thereby reducing stress and improving the aesthetics of the battery cell.

[0081] Optionally, as Figure 1 shown, the fine grid line 20 further includes: a plurality of third fine grids 23, wherein the plurality of third fine grids 23 are disposed in the regions between the first fine grid 21 and the first edge 11 and between the first fine grid 21 and the second edge 12; the plurality of third fine grids 23 are disposed between two second fine grids 22, and along the second direction B, no second fine grid 22 is disposed between the plurality of third fine grids 23.

[0082] As Figure 1 shown, the fine grid line 20 in the embodiment of the present application further includes a plurality of third fine grids 23, and the plurality of third fine grids 23 are disposed in the regions between the first fine grid 21 and the first edge 11 of the battery cell 10 and between the first fine grid 21 and the second edge 12 of the battery cell 10. And, along the second direction B, the plurality of third fine grids 23 are disposed between two second fine grids 22, and no second fine grid 22 is disposed between the plurality of third fine grids 23. Optionally, as Figure 1 、 Figures 3 to 5 shown, no thickening section 30 is disposed on any of the third fine grids 23. To reduce the number of the disposed thickening sections 30, thereby while ensuring the photoelectric conversion efficiency of the battery cell 10 and the reliability of the battery cell 10, reducing the production cost of the battery cell 10 and improving the competitive advantage of the product.

[0083] In other words, in the arrangement regions of the first glue dot columns 40 and the second glue dot columns 41, along the center line of the first glue dot columns 40 and the second glue dot columns 41, no thickening section 30 is disposed on each of the third fine grids 23.

[0084] As Figure 1 、 Figures 3 to 5As shown, in the embodiment of the present application, in the arrangement area of the first glue dot column 40 and the second glue dot column 41, that is, in the multi-column area extending along the second direction B through the entire battery cell 10. Along the center lines of the first glue dot column 40 and the second glue dot column 41, that is, on the straight line formed by connecting the projections of the multiple glue dots 43 in the first glue dot column 40 in the direction perpendicular to the plane where the battery cell 10 is located, and on the straight line formed by connecting the projections of the multiple glue dots 43 in the second glue dot column 41 in the direction perpendicular to the plane where the battery cell 10 is located, no thickened section 30 is provided on each third fine grid 23. Thus, the number of thickened sections 30 is reduced, so as to reduce the production cost of the battery cell 10 while ensuring the photoelectric conversion efficiency of the battery cell 10 and the reliability of the battery cell 10, and improve the competitive advantage of the product.

[0085] Optionally, as Figure 1 、 Figures 3 to 5 shown, in the arrangement area of the first glue dot column 40 and the second glue dot column 41, along the center lines of the first glue dot column 40 and the second glue dot column 41, thickened sections 30 are provided on each second fine grid 22.

[0086] As Figure 1 、 Figures 3 to 5 shown, in the embodiment of the present application, in the arrangement area of the first glue dot column 40 and the second glue dot column 41, that is, in the multi-column area extending along the second direction B through the entire battery cell 10. Along the center lines of the first glue dot column 40 and the second glue dot column 41, that is, on the straight line formed by connecting the projections of the multiple glue dots 43 in the first glue dot column 40 in the direction perpendicular to the plane where the battery cell 10 is located, and on the straight line formed by connecting the projections of the multiple glue dots 43 in the second glue dot column 41 in the direction perpendicular to the plane where the battery cell 10 is located, thickened sections 30 are provided on each second fine grid 22. Thus, each connection line 50 is connected to multiple second fine grids 22 through multiple thickened sections 30, so that good contact is achieved between each connection line 50 and the multiple second fine grids 22, and it is not easy for the connection line 50 to separate from the second fine grid 22, so as to improve the photoelectric conversion efficiency of the battery cell 10 and the reliability of the battery cell 10.

[0087] Optionally, as Figure 1 、 Figures 3 to 5 shown, the first glue dot column 40 and the second glue dot column 41 include multiple second glue dots 45, the second glue dots 45 are located between adjacent second fine grids 22 and third fine grids 23, and / or the second glue dots 45 are located between adjacent two third fine grids 23, wherein at least one second glue dot 45 partially covers the third fine grid 23.

[0088] As Figure 1 、 Figures 3 to 5As shown, second glue dots 45 are also provided in the first glue dot column 40 and the second glue dot column 41 in the embodiments of the present application. Among them, the second glue dots 45 are provided between adjacent second fine grids 22 and third fine grids 23, and / or the second glue dots 45 are provided between two adjacent third fine grids 23. And, there are multiple second glue dots 45, and at least one second glue dot 45 partially covers the third fine grid 23. That is to say, the size of the second glue dot 45 is relatively large, so as to stably connect the end of the connection line 50 to the surface of the battery cell 10 through the relatively large second glue dot 45, and prevent the end of the connection line 50 from detaching from the surface of the battery cell 10, which affects the photoelectric conversion efficiency of the battery cell 10 and the reliability of the battery cell 10.

[0089] As a preferred embodiment, as Figure 1 、 Figures 3 to 5 shown, the glue dots 43 closest to the first edge 11 and the second edge 12 on the battery cell 10 are the third glue dots 46, and the size of each third glue dot 46 is larger than that of other glue dots 43.

[0090] As Figure 1 、 Figures 3 to 5 shown, in the embodiments of the present application, the glue dots 43 closest to the first edge 11 and the second edge 12 on the battery cell 10 are called the third glue dots 46. And the size of each third glue dot 46 is set to be larger than that of other glue dots 43, so as to firmly connect the end of the connection line 50 to the surface of the battery cell 10 through the third glue dots 46 closest to the first edge 11 and the second edge 12, thereby improving the reliability of the battery cell 10.

[0091] Optionally, as Figure 1 and Figure 5 shown, the surface of the battery cell 10 includes a first surface 15 and a second surface 16. Among them, the projection of the glue dots 43 on the first surface 15 in the direction perpendicular to the battery cell 10 is misaligned with the projection of the glue dots 43 on the second surface 16 in the direction perpendicular to the battery cell 10.

[0092] Figure 1 shows the arrangement of the glue dots 43 on the first surface 15 of the battery cell 10, Figure 5 shows the arrangement of the glue dots 43 on the second surface 16 of the battery cell 10. Among them, the projection of the glue dots 43 on the first surface 15 in the direction perpendicular to the battery cell 10 is misaligned with the projection of the glue dots 43 on the second surface 16 in the direction perpendicular to the battery cell 10.

[0093] During the processing of photovoltaic modules, it is necessary to print a plurality of glue dots 43 on the first surface 15 of the cell 10 by means of screen printing. Then, a plurality of glue dots 43 are printed on the second surface 16 of the cell 10 by means of screen printing. During the printing process, since the first surface 15 of the cell 10 is not supported, in order to avoid the plurality of glue dots 43 on the first surface 15. Therefore, the projections of the plurality of glue dots 43 on the second surface 16 in the direction perpendicular to the cell 10 are misaligned with the projections of the plurality of glue dots 43 on the first surface 15 in the direction perpendicular to the cell 10.

[0094] In the embodiment of the present application, the projection of the glue dot 43 on the first surface 15 of the cell 10 in the direction perpendicular to the cell 10 and the projection of the glue dot 43 on the second surface 16 of the cell 10 in the direction perpendicular to the cell 10 may also be at least partially overlapped. In order to facilitate the printing of the glue dots 43 on the first surface 15 and the second surface 16 of the cell 10 by means of screen printing during the processing of the photovoltaic module.

[0095] Optionally, as Figures 1 to 6 shown, along the second direction B, the distance between two adjacent fine grid lines 20 is L, and the length of the glue dot 43 is L 1 , where, 0.6L ≤ L 1 ≤ 0.9L.

[0096] As Figures 1 to 6 shown, along the second direction B, the distance between two adjacent fine grid lines 20 is set to L, and the length of the glue dot 43 is set to L 1 , and L 1 is set to be greater than or equal to 0.6L, and, less than or equal to 0.9L. In the embodiment of the present application, the length L 1 of the glue dot 43 is set to be greater than or equal to 0.6 times the distance L between two adjacent fine grid lines 20, so that the glue dot 43 is sufficient to connect the connection line 50 to the surface of the cell 10. Since the glue dot 43 is not conductive, the length L 1 of the glue dot 43 is set to be less than or equal to 0.9 times the distance L between two adjacent fine grid lines 20, so that the glue dot 43 can be arranged between two adjacent fine grid lines 20, avoiding the influence of the glue dot 43 on the electrical connection between the connection line 50 and the fine grid line 20.

[0097] Exemplarily, in the embodiment of the present application, L 1 can be set to be equal to 0.6L, L 1 can be set to be equal to 0.7L, L 1 can also be set to be equal to 0.8L, or L 1Set to be equal to 0.9L. In this regard, no specific limitation is imposed in the embodiments of the present application. In actual use, those skilled in the art can set it as needed.

[0098] Optionally, as Figures 1 to 6 shown, along the second direction B, the distance L between the glue dot 43 and the adjacent thickened segment 30 2 , where L 2 ≥0.15L.

[0099] As Figures 1 to 6 shown, along the second direction B, the distance between the glue dot 43 and the adjacent thickened segment 30 is set to L 2 , and L 2 is set to be greater than or equal to 0.15 times the distance L between two adjacent thin grid lines 20. To avoid the glue dot 43 affecting the electrical connection between the connection line 50 and the thickened segment 30.

[0100] Exemplarily, the distance L between the glue dot 43 and the adjacent thickened segment 30 2 can be set to be equal to 0.15 times the distance L between two adjacent thin grid lines 20, the distance L between the glue dot 43 and the adjacent thickened segment 30 2 can be set to be equal to 0.2 times the distance L between two adjacent thin grid lines 20, and the distance L between the glue dot 43 and the adjacent thickened segment 30 2 can be set to be equal to 0.25 times the distance L between two adjacent thin grid lines 20. In this regard, no specific limitation is imposed in the embodiments of the present application. In actual use, those skilled in the art can set it as needed.

[0101] Optionally, the surface of the battery cell 10 includes a first surface 15 and a second surface 16. Among them, the first thin grid 21 located on the first surface 15 satisfies M = 1 or 2, and N = 1 or 2; and / or, the first thin grid 21 located on the second surface 16 satisfies M = 1 or 2, and N = 1 or 2.

[0102] As Figures 1 to 6 shown, in the embodiments of the present application, in the arrangement area of the first glue dot column 40, along the second direction B, multiple first thin grids 21 on the first surface 15 and the second surface 16 of the battery cell 10 satisfy that there are N first thin grids 21 without thickened segments 30 spaced between every M first thin grids 21 with thickened segments 30. Among them, M = 1 or 2, and N = 1 or 2.

[0103] For example, in the arrangement area of the first glue dot column 40, along the second direction B, between every two first fine grids 21 with a thickened section 30, there are two first fine grids 21 without a thickened section 30 spaced therebetween. For another example, between every two first fine grids 21 with a thickened section 30, there are two first fine grids 21 without a thickened section 30 spaced therebetween. For yet another example, between every two first fine grids 21 with a thickened section 30, there is one first fine grid 21 without a thickened section 30 spaced therebetween.

[0104] In the embodiment of the present application, in the arrangement area of the first glue dot column 40, along the second direction B, by arranging N first fine grids 21 without a thickened section 30 at intervals between every M first fine grids 21 with a thickened section 30. Thus, while ensuring the contact reliability between the connection line 50 and the first fine grid 21, the number of thickened sections 30 arranged is further reduced to reduce the production cost of the battery chip.

[0105] The battery chip 10 in the embodiment of the present application can be a battery chip without a main grid or a battery chip with a main grid. In actual use, those skilled in the art can select according to needs.

[0106] In the case where the battery chip 10 is a battery chip with a main grid, on the surface of the battery chip 10, there are multiple main grids extending along the second direction B and arranged at intervals along the first direction A, and each glue dot 43 is located above the multiple main grids, so as to connect the connection line 50 to the main grid through multiple glue dots 43 located above one main grid, thereby collecting the current collected by the fine grid lines through the main grid and integrating the collected current through the connection line 50.

[0107] The battery chip 10 in the embodiment of the present application is usually of a rectangular structure, and the specific dimensions of the rectangular battery chip 10 may include: (182 ± 2) mm * (96 ± 1) mm, (192 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (105 ± 1) mm, etc.

[0108] Certainly, in the embodiment of the present application, there are no restrictions on the specific structure and specific dimensions of the battery chip 10, and any battery chip 10 with any structure and any dimensions belongs to the protection scope of the present application. In actual use, those skilled in the art can select a suitable battery chip as the battery chip 10 according to needs.

[0109] The battery chip 10 in the embodiment of the present application can be a heterojunction battery chip, a monocrystalline silicon battery chip, a polycrystalline silicon battery chip, an amorphous silicon battery chip, a copper indium gallium selenide battery chip, a gallium arsenide battery chip, a cadmium telluride battery chip, a polymer battery chip, etc.

[0110] Similarly, in the embodiments of the present application, there are no excessive restrictions on the specific type of the battery cell 10. In actual use, those skilled in the art can make selections according to needs.

[0111] It should be noted that the glue dots 43 in the embodiments of the present application are usually made of non-conductive materials and do not have conductivity. Therefore, they are also called non-conductive glue dots.

[0112] The embodiments of the present application disclose a battery cell, which includes: a battery cell, on the surface of which there are multiple fine grid lines extending along a first direction and arranged at intervals along a second direction perpendicular to the first direction; multiple first glue dot columns, each first glue dot column extending along the second direction, and the multiple first glue dot columns being arranged at intervals along the first direction; each first glue dot column including multiple glue dots, each glue dot being disposed between two adjacent fine grid lines; the multiple fine grid lines including multiple first fine grids, and each first fine grid having multiple thickened segments; the glue dots including first glue dots, the first glue dots being located between two adjacent first fine grids; in the arrangement area of each first glue dot column, along the second direction, on both sides of each first glue dot, there is at most one thickened segment at the position where two adjacent first fine grids are adjacent to the first glue dot; in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a manner of being projected and misaligned along the first direction.

[0113] In the battery cell disclosed in the present application, by providing multiple thickened segments on each first fine grid and disposing the first glue dots between two first fine grids, in the arrangement area of each first glue dot column, along the second direction, there is at most one thickened segment at the position where two adjacent first fine grids are adjacent to the first glue dot on both sides of each first glue dot. Thus, a connection line can be bonded to the surface of the battery through each first glue dot column, and the connection line is connected to the first fine grid through the thickened segments. During the lamination process of the battery cell, the contact between the connection line and the first fine grid is good, and it is not easy for the connection line to separate from the first fine grid, thereby improving the photoelectric conversion efficiency and reliability of the battery cell.

[0114] Moreover, in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a manner of being projected and misaligned along the first direction. By bonding two connection lines to the surface of the battery cell through two adjacent first glue dot columns, the thickened segments on the first fine grids corresponding to the two adjacent first glue dot columns are arranged in a manner of being projected and misaligned along the first direction. Thus, under the condition of reducing the number of thickened segments, the two adjacent connection lines can be better connected to multiple first fine grids through the thickened segments arranged in a manner of being projected and misaligned along the first direction. To further improve the reliability of the contact between the connection line and the first fine grid.

[0115] An embodiment of the present application also discloses a battery string, which includes at least two battery cells 10 as described in the above embodiment; a connecting wire 50, and the connecting wire 50 electrically connects at least two battery cells 10.

[0116] Referring to Figure 6 , a schematic structural diagram of the battery string described in the embodiment of the present application is shown.

[0117] As Figure 6 shown, the battery string disclosed in the embodiment of the present application includes at least two battery cells 10 in the above embodiment and a plurality of connecting wires 50. At least two battery cells 10 are arranged at intervals, and at least two battery cells 10 are electrically connected by a plurality of connecting wires 50, so as to collect the current generated by a plurality of battery cells 10 through the connecting wires 50.

[0118] It should be noted that in the embodiment of the present application, the battery cells included in the battery string have the same structure as the battery cells described in the above embodiment, and their beneficial effects are also similar, so they will not be elaborated here.

[0119] Optionally, the surface of the battery cell 10 includes a first surface 15 and a second surface 16. Among them, the connecting wire 50 passes through the gap between two adjacent battery cells 10, and a part is electrically connected to the first surface 15 of one battery cell 10, and the other part is electrically connected to the second surface 16 of another battery cell 10.

[0120] Generally, the first surface 15 of the battery cell 10 serves as one electrode of the battery cell 10, and the second surface 16 of the battery cell 10 serves as the other electrode of the battery cell 10. In the embodiment of the present application, at least two battery cells 10 are arranged at intervals, and the first surfaces 15 of at least two battery cells 10 all face one direction, and the second surfaces 16 all face another direction.

[0121] In the embodiment of the present application, the connecting wire 50 passes through the gap between two adjacent battery cells 10, and a part is electrically connected to the first surface 15 of one of the two adjacent battery cells 10, and the other part is electrically connected to the second surface 16 of the other of the two adjacent battery cells 10, so as to connect two adjacent battery cells 10 in series to collect the current generated by two adjacent battery cells 10.

[0122] Optionally, as Figure 6 shown, there are multiple connecting wires 50. The multiple connecting wires 50 extend along the second direction B and are arranged at intervals along the first direction A.

[0123] As Figure 6As shown in the figure, the battery string in the embodiment of the present application includes a plurality of connecting lines 50. The plurality of connecting lines 50 are extended along the second direction B and arranged at intervals along the first direction A. The currents generated by two adjacent battery cells 10 are collected through the plurality of connecting lines 50, so as to collect as much current generated by two adjacent battery cells 10 as possible.

[0124] Optionally, as Figure 6 shown in the figure, the connecting line 50 is connected to the surface of the battery cell 10 through a glue point 43.

[0125] As Figure 6 shown in the figure, each connecting line 50 in the embodiment of the present application is connected to the surface of the battery cell 10 through a column of glue points 43. Specifically, this column of glue points 43 can be the first glue point column 40 or the second glue point column 41. The plurality of connecting lines 50 are arranged in one-to-one correspondence with the plurality of first glue point columns 40 and the plurality of second glue point columns 41.

[0126] The embodiment of the present application also discloses a photovoltaic module. The photovoltaic module includes a plurality of battery strings as described in the above embodiment, and the plurality of battery strings are arranged at intervals.

[0127] It should be noted that in the embodiment of the present application, the battery string included in the photovoltaic module has the same structure as the battery string described in the above embodiment, and its beneficial effects are also similar, so they will not be elaborated here.

[0128] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0129] Although the optional embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the optional embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0130] Finally, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such article or terminal device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the article or terminal device including the element.

[0131] The technical solution provided by the present invention has been introduced in detail above. Specific examples are used herein to illustrate the principle and implementation manner of the present invention. At the same time, for those of ordinary skill in the art, according to the principle and implementation manner of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A solar cell, characterized in that, it includes: a solar cell, on the surface of which there are a plurality of fine grid lines extending in a first direction and arranged at intervals in a second direction, the second direction being perpendicular to the first direction; a plurality of first glue dot columns, each of the first glue dot columns extending in the second direction, the plurality of first glue dot columns being arranged at intervals in the first direction; each of the first glue dot columns includes a plurality of glue dots, and each of the glue dots is disposed between two adjacent fine grid lines; the plurality of fine grid lines include a plurality of first fine grids, and each of the first fine grids is provided with a plurality of thickened segments; the glue dots include first glue dots, and the first glue dots are located between two adjacent first fine grids; in the arrangement area of each of the first glue dot columns, along the second direction, on both sides of each of the first glue dots, there is at most one thickened segment at the position where two adjacent first fine grids are adjacent to the first glue dot; in the arrangement areas of two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a manner that their projections along the first direction are misaligned.

2. The solar cell according to claim 1, characterized in that, in the arrangement area of the first glue dot columns, along the second direction, there are N first fine grids without thickened segments spaced between every M first fine grids having thickened segments, where M and N are both integers greater than or equal to 1.

3. The solar cell according to claim 2, characterized in that, the solar cell includes a first edge and a second edge opposite to each other in the second direction; the fine grid lines further include: a plurality of second fine grids, where the plurality of second fine grids are disposed in the areas between the first fine grids and the first edge and between the first fine grids and the second edge; the second fine grids are closer to the first edge and the second edge than the first fine grids; the second fine grids are provided with a plurality of thickened segments along the first direction.

4. The solar cell according to claim 3, characterized in that, the solar cell further includes: a plurality of second glue dot columns, each of the second glue dot columns extending in the second direction, the plurality of second glue dot columns being arranged at intervals in the first direction, each of the second glue dot columns includes a plurality of glue dots, and each of the glue dots is disposed between two adjacent fine grid lines; in the arrangement area of the second glue dot columns, along the center line of the second glue dot columns, each of the first fine grids and each of the second fine grids are provided with thickened segments.

5. The solar cell according to claim 4, characterized in that, the solar cell includes a third edge and a fourth edge opposite to each other in the first direction, where the plurality of first glue dot columns are disposed between the third edge and the fourth edge; at least one second glue dot column is disposed at a position between the plurality of first glue dot columns and the third edge, at least one second glue dot column is disposed at a position between the plurality of first glue dot columns and the fourth edge, and at least one second glue dot column is disposed at the central position of the plurality of first glue dot columns.

6. The solar cell according to claim 5, characterized in that, When the sum of the number of the first glue dot columns and the number of the second glue dot columns is odd, the number of the second glue dot columns arranged at the central position of the first glue dot columns is 1 or 3; When the sum of the number of the first glue dot columns and the number of the second glue dot columns is even, the number of the second glue dot columns arranged at the central position of the first glue dot columns is 2 or 4.

7. The solar cell according to any one of claims 3-6, wherein, the fine grid lines further include: a plurality of third fine grid lines, wherein, the plurality of third fine grid lines are arranged in the area between the first fine grid line and the first edge and in the area between the first fine grid line and the second edge; a plurality of the third fine grid lines are arranged between two of the second fine grid lines, and along the second direction, no second fine grid line is arranged between the plurality of third fine grid lines.

8. The solar cell according to claim 7, wherein, in the arrangement area of the first glue dot column and the second glue dot column, along the center line of the first glue dot column and the second glue dot column, no thickened section is arranged on each of the third fine grid lines.

9. The solar cell according to claim 7, wherein, no thickened section is arranged on the third fine grid lines.

10. The solar cell according to any one of claims 8-9, wherein, in the arrangement area of the first glue dot column and the second glue dot column, along the center line of the first glue dot column and the second glue dot column, a thickened section is arranged on each of the second fine grid lines.

11. The solar cell according to claim 7, wherein, the first glue dot column and the second glue dot column include a plurality of second glue dots, the second glue dots are located between adjacent second fine grid lines and the third fine grid lines, and / or, the second glue dots are located between adjacent two of the third fine grid lines, wherein, at least one of the second glue dots partially covers the third fine grid lines.

12. The solar cell according to claim 7, wherein, the glue dots closest to the first edge and the second edge on the solar cell are third glue dots, and the size of each third glue dot is larger than the size of other glue dots.

13. The solar cell according to any one of claims 1-6, 8, 9, 11, 12, wherein, the surface of the solar cell includes a first surface and a second surface, wherein, the projection of the glue dots on the first surface along the direction perpendicular to the solar cell is misaligned with the projection of the glue dots on the second surface along the direction perpendicular to the solar cell.

14. The solar cell according to any one of claims 1-6, 8, 9, 11, 12, wherein, the surface of the solar cell includes a first surface and a second surface, wherein, the projection of the glue dots on the first surface along the direction perpendicular to the solar cell at least partially overlaps with the projection of the glue dots on the second surface along the direction perpendicular to the solar cell.

15. The solar cell according to any one of claims 1-6, 8, 9, 11, 12, wherein, Along the second direction, the distance between two adjacent thin grid lines is L, and the length of the glue dot is L 1 , where 0.6L ≤ L 1 ≤ 0.9L.

16. The solar cell according to any one of claims 1-6, 8, 9, 11, 12, wherein, In the second direction, the distance L between the glue dot and the adjacent thickened section 2 , where L 2 ≥0.15L.

17. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, the surface of the solar cell includes a first surface and a second surface, wherein, the first fine grid located on the first surface satisfies M = 1 or 2, and N = 1 or 2; and / or, the first fine grid located on the second surface satisfies M = 1 or 2, and N = 1 or 2.

18. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, the solar cell includes a main-gridless solar cell.

19. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, multiple main grids extending along the second direction and arranged at intervals along the first direction are provided on the surface of the solar cell; each of the glue dots is located above the multiple main grids.

20. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, the size of the solar cell includes: (182 ± 2) mm * (96 ± 1) mm, (192 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (91 ± 1) mm, (182 ± 2) mm * (105 ± 1) mm.

21. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, the solar cell includes one of a heterojunction solar cell, a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, a copper indium gallium selenide solar cell, a gallium arsenide solar cell, a cadmium telluride solar cell, and a polymer solar cell.

22. The solar cell according to any one of claims 1-6, 8, 9, 11, and 12, characterized in that, the glue dot includes a non-conductive glue dot.

23. A battery string, characterized in that, it includes: at least two solar cells according to any one of claims 1-22; connection lines, and the connection lines electrically connect at least two of the solar cells.

24. The battery string according to claim 23, characterized in that, the surface of the solar cell includes a first surface and a second surface, wherein, the connection line passes through the gap between two adjacent solar cells, and a part of it is electrically connected to the first surface of one solar cell, and the other part is electrically connected to the second surface of the other solar cell.

25. The battery string according to claim 23 or 24, characterized in that, the connection lines include multiple ones, and the multiple connection lines extend along the second direction and are arranged at intervals along the first direction.

26. The battery string according to claim 25, characterized in that, the connection lines are connected to the surface of the solar cell through the glue dots.

27. A photovoltaic module, characterized in that, it includes: multiple battery strings according to any one of claims 23-26, and the multiple battery strings are arranged at intervals.

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