Cell, cell string and photovoltaic module

Abstract

Specifically disclosed are a cell, a cell string and a photovoltaic module, which belong to the technical field of photovoltaic modules. A cell is comprised, wherein a plurality of fine grid lines, which extend in a first direction and are arranged at intervals in a second direction, are provided on a surface of the cell; a plurality of first glue dot columns are provided, wherein each first glue dot column extends in the second direction, and the plurality of first glue dot columns are arranged at intervals in the first direction; each first glue dot column comprises a plurality of glue dots, and each glue dot is arranged between two adjacent fine grid lines; the plurality of fine grid lines comprise a plurality of first fine grids, and each first fine grid is provided with a plurality of thickened sections; the glue dots comprise first glue dots, and each first glue dot is located between two adjacent first fine grids; in an arrangement area of each first glue dot column, in the second direction and at two sides of each first glue dot, at most one thickened section is provided at locations, which are close to the first glue dot, on two adjacent first fine grids; and in an arrangement area of two adjacent first glue dot columns, thickened sections of the first fine grids are arranged in a manner of projections in the first direction being staggered.

Description

Solar cells, battery strings and photovoltaic modules

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 30, 2023, with application number 202311111572.2 and invention name “Battery Cell, Battery String and Photovoltaic Module”, and the Chinese patent application filed with the China Patent Office on August 30, 2023, with application number 202311108060.0 and invention name “A Battery String and Photovoltaic Module”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photovoltaic modules, and in particular to a battery cell, a battery string and a photovoltaic module. Background Art

[0003] A cell string is a core component of a photovoltaic module, converting solar energy into electricity. A cell string comprises a plurality of cells arranged in sequence, with a plurality of fine grids arranged along a first direction on the surface of the cells. Typically, metal paste is screen-printed onto the surface of the cells to form a plurality of fine grids arranged along the first direction. These grids collect the current generated on the cell surface. Multiple welding ribbons are laid along a second direction on the surface of the cells, each of which cross-connects to the plurality of fine grids, allowing the current collected by the grids to be collected by the welding ribbons.

[0004] However, during the cell string lamination process, the poor solderability of the fine grid paste results in poor contact between the solder ribbon and the fine grid. This can lead to the ribbon and fine grid easily separating, affecting the photovoltaic conversion efficiency of the cell and causing the cell reliability to fall short of expectations.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a solar cell, a solar cell string and a photovoltaic module.

[0007] Specifically, this application involves the following aspects:

[0008] In a first aspect, the present application discloses a battery cell, comprising a battery cell, on the surface of which are provided a plurality of 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 of which extends along the second direction, and the plurality of first glue dot columns are arranged at intervals along the first direction; each of the first glue dot columns comprises a plurality of glue dots, each of which is arranged between two adjacent fine grid lines; the plurality of fine grid lines comprises a plurality of first fine grids, each of which is provided with a plurality of thickened segments; the glue dots comprise a first glue dot, which is 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 first glue dot, two adjacent first fine grids adjacent to the first glue dot have at most one thickened segment in total; in the arrangement area of ​​two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a projection staggered manner along the first direction.

[0009] Optionally, in the arrangement area of ​​the first glue dot column, along the second direction, every M first fine grids with the thickened segments are spaced apart by N first fine grids without the thickened segments, and M and N are both integers greater than or equal to 1.

[0010] Optionally, the battery cell includes a first edge and a second edge opposite to each other along the second direction; the fine grid line also includes: a plurality of second fine grids, the plurality of second fine grids being arranged in the area between the first fine grid and the first edge and the area between the first fine grid and the second edge; the second fine grid is closer to the first edge and the second edge than the first fine grid; the second fine grid is provided with a plurality of the thickened segments along the first direction.

[0011] Optionally, the battery cell also includes a plurality of second glue dot columns, each of the second glue dot columns extends along the second direction, and the plurality of second glue dot columns are arranged at intervals along the first direction, each of the second glue dot columns includes a plurality of glue dots, and each of the glue dots is arranged 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 is provided with the thickened segment.

[0012] Optionally, the battery cell includes a third edge and a fourth edge opposite to each other along the first direction, and the multiple first glue point columns are arranged between the third edge and the fourth edge; at least one second glue point column is arranged between the multiple first glue point columns and the third edge, at least one second glue point column is arranged between the multiple first glue point columns and the fourth edge, and at least one second glue point column is arranged at the center of the multiple first glue point columns.

[0013] Optionally, when the sum of the number of the first glue dot column and the second glue dot column is an odd number, the number of the second glue dot column arranged at the center position of the first glue dot column is 1 or 3; when the sum of the number of the first glue dot column and the second glue dot column is an even number, the number of the second glue dot column arranged at the center position of the first glue dot column is 2 or 4.

[0014] Optionally, the fine gate line also includes multiple third fine gates, and the multiple third fine gates are arranged in the area between the first fine gate and the first edge and the area between the first fine gate and the second edge; the multiple third fine gates are arranged between two second fine gates, and along the second direction, the second fine gates are not arranged between the multiple third fine gates.

[0015] Optionally, 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, each of the third fine grids is not provided with the thickened segment.

[0016] Optionally, the thickened segment is not provided on the third fine grid.

[0017] Optionally, 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, the thickened segment is provided on each of the second fine grids.

[0018] Optionally, the first glue dot column and the second glue dot column include multiple second glue dots, the second glue dots are located between adjacent second fine grids and third fine grids, and / or, the second glue dots are located between two adjacent third fine grids, and at least one second glue dot partially covers the third fine grid.

[0019] Optionally, the glue spots on the battery cell closest to the first edge and the second edge are third glue spots, and a size of each of the third glue spots is larger than a size of the other glue spots.

[0020] Optionally, the surface of the battery cell includes a first surface and a second surface, and the projection of the glue point located on the first surface along the direction perpendicular to the battery cell and the projection of the glue point located on the second surface along the direction perpendicular to the battery cell are offset from each other.

[0021] Optionally, the surface of the battery cell includes a first surface and a second surface, and the projection of the glue point located on the first surface along the direction perpendicular to the battery cell at least partially overlaps with the projection of the glue point located on the second surface along the direction perpendicular to the battery cell.

[0022] Optionally, along the second direction, the distance between two adjacent thin grid lines is L, and the length of the glue dot is L1, 0.6L≤L1≤0.9L.

[0023] Optionally, along the second direction, a distance L2 between the glue point and the adjacent thickened segment is L2 ≥ 0.15L.

[0024] Optionally, the surface of the battery cell includes a first surface and a second surface, and 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.

[0025] Optionally, the battery cell includes a battery cell without a busbar.

[0026] Optionally, a plurality of main grids extending along the second direction and spaced apart along the first direction are provided on the surface of the battery cell; each of the glue dots is located above the plurality of main grids.

[0027] Optionally, the sizes of the battery cells 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.

[0028] 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, and a polymer cell.

[0029] Optionally, the glue dots include non-conductive glue dots.

[0030] In a second aspect, the present application discloses a battery string, which includes the battery cell described in the first aspect, wherein the battery cell is provided with a plurality of fine grid lines extending along a first direction and arranged at intervals along a second direction; a plurality of connecting lines, wherein the plurality of connecting lines extend along the second direction and are arranged at intervals along the first direction, each of the connecting lines is connected to the surface of the battery cell through a plurality of glue points arranged at intervals, and the second direction is perpendicular to the first direction; along the direction perpendicular to the plane where the battery cell is located, the glue points are arc-shaped protrusions, the height of the arc-shaped protrusions is less than or equal to 200μm, and along the first direction and the second direction, the length of the arc-shaped protrusions is greater than or equal to 1mm and less than or equal to 2mm.

[0031] Optionally, along a direction perpendicular to the plane where the battery cell is located, each of the connecting lines is at least partially embedded in a plurality of the glue points spaced apart along the second direction.

[0032] Optionally, along a direction perpendicular to the plane where the battery cell is located, a depth at which the connecting wire is embedded in the glue spot accounts for 40% to 100% of a height of the glue spot.

[0033] Optionally, a cross-section of the connecting line along the second direction has a wavy structure.

[0034] Optionally, along the second direction, the connection line connected to the glue point forms a raised section, and a distance between a side of the raised section close to the battery cell and a surface of the battery cell is less than or equal to 200 um.

[0035] Optionally, along the second direction, the arched segment spans two adjacent fine grid lines.

[0036] Optionally, along the second direction, the connecting line between two adjacent arched segments is a horizontal segment, the horizontal segment is connected to the surface of the battery cell, and the horizontal segment is electrically connected to at least one of the fine grid lines.

[0037] Optionally, along a direction perpendicular to the plane where the battery cell is located, the connecting line has a first projection on the battery cell, and the length of the first projection is L1; along the second direction, the sum of the lengths of the horizontal segments is L2, 0.7L1≤L2≤0.9L1.

[0038] Optionally, along the second direction, the glue point is at least partially arranged between two adjacent fine grid lines; along the direction perpendicular to the plane where the battery cell is located, there is a gap between the connecting line and the two fine grid lines closest to the glue point along the second direction.

[0039] Optionally, along the second direction, there is a first gap between two adjacent fine grid lines, and the glue dots are arranged in the first gap.

[0040] In a third aspect, the present application further discloses a photovoltaic module, which includes a plurality of battery strings as described in the second aspect, wherein the plurality of battery strings are arranged at intervals.

[0041] In a fourth aspect, the present application further discloses a photovoltaic module, which includes a plurality of battery cells as described in the first aspect, wherein the plurality of battery cells are connected to form a battery string.

[0042] The present application discloses a battery cell, a battery string and a photovoltaic module, the battery cell comprising a battery cell, a surface of which is provided with a plurality of 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 of which extends along the second direction and is arranged at intervals along the first direction; each of the first glue dot columns comprises a plurality of glue dots, each of which is arranged between two adjacent fine grid lines; the plurality of fine grid lines comprises a plurality of first fine grids, each of which is provided with a plurality of thickened segments; the glue dots comprise a first glue dot, which is 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, two adjacent first fine grids adjacent to the first glue dot have at most one thickened segment in total; in the arrangement area of ​​two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a projection-staggered manner along the first direction.

[0043] The cell disclosed in this application provides multiple thickened sections on each first fine grid, and places a first glue point between two first fine grids. Within the arrangement area of ​​each first glue point column, at most one thickened section is provided immediately adjacent to the first glue point on both sides of each first glue point along the second direction. This allows a connecting wire to be bonded to the surface of the cell through each first glue point column, connecting the connecting wire to the first fine grid via the thickened sections. During the cell lamination process, the connecting wire and the first fine grid maintain good contact and are unlikely to separate, thereby improving the cell's photoelectric conversion efficiency and reliability.

[0044] Furthermore, in the arrangement area of ​​two adjacent first glue dot columns in the present application, the thickened segments of the first fine grid are arranged in a manner that is projected and staggered along the first direction. Two connecting wires are bonded to the surface of the battery cell through two adjacent first glue dot columns, and the thickened segments on the first fine grid corresponding to the two adjacent first glue dot columns are arranged in a manner that is projected and staggered along the first direction. Thus, while reducing the number of thickened segments, the two adjacent connecting wires can be better connected to the multiple first fine grids through the multiple thickened segments arranged in a projected and staggered manner along the first direction. This further improves the reliability of the contact between the connecting wires and the first fine grids.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] FIG1 shows a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0048] FIG2 shows a partial enlarged view CC of the battery cell described in an embodiment of the present application;

[0049] FIG3 shows a partial enlarged view DD of the battery cell described in the embodiment of the present application;

[0050] FIG4 shows a partial enlarged view EE of the battery cell in the embodiment of the present application;

[0051] FIG5 shows a second structural diagram of the battery cell according to an embodiment of the present application;

[0052] FIG6 is a schematic structural diagram of a battery string according to an embodiment of the present application;

[0053] FIG7 is a schematic structural diagram of the bold segment in an embodiment of the present application;

[0054] FIG8 shows a first structural diagram of a battery string according to an embodiment of the present application;

[0055] FIG9 shows a cross-sectional view of the battery string along the extending direction of the connecting line in an embodiment of the present application;

[0056] FIG10 shows a cross-sectional view of the glue point described in an embodiment of the present application;

[0057] FIG11 shows a cross-sectional view of the connecting line embedded in the glue point along a direction perpendicular to the extending direction of the connecting line in the embodiment of the present application;

[0058] FIG12 shows a partial cross-sectional view of the photovoltaic module at a glue point along an extension direction perpendicular to the connecting line in an embodiment of the present application;

[0059] FIG13 shows a partial cross-sectional view of the photovoltaic module at a glue point along the extending direction of the connecting line in an embodiment of the present application;

[0060] FIG14 shows a partial cross-sectional view of the photovoltaic module at a non-glue point along an extending direction perpendicular to the connecting line in an embodiment of the present application;

[0061] FIG15 shows a partial cross-sectional view of the photovoltaic module at a non-glue point along the extending direction of the connecting line in an embodiment of the present application;

[0062] Reference numerals:

[0063] 10: Cell; 11: First edge; 12: Second edge; 13: Third edge; 14: Fourth edge; 15: First surface; 16: Second surface; 17: TCO layer;

[0064] 20: fine grid line; 21: first fine grid; 22: second fine grid; 23: third fine grid;

[0065] 30: bold segment;

[0066] 40: First glue point row; 41: Second glue point row; 43: Glue point; 44: First glue point; 45: Second glue point; 46: Third glue point;

[0067] 50: connecting line; 51: arched section; 52: horizontal section; 53: connecting line base; 54: metal layer;

[0068] 60: cover plate;

[0069] 70: first adhesive layer; 71: EVA layer; 72: POE layer;

[0070] A: first direction; B: second direction. Specific embodiments

[0071] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0072] Referring to Figure 1, there is shown a structural schematic diagram 1 of the battery cell described in an embodiment of the present application; referring to Figure 2, there is shown a partial enlarged view CC of the battery cell described in an embodiment of the present application; referring to Figure 3, there is shown a partial enlarged view DD of the battery cell described in an embodiment of the present application; referring to Figure 4, there is shown a partial enlarged view EE of the battery cell described in an embodiment of the present application; referring to Figure 5, there is shown a structural schematic diagram 2 of the battery cell described in an embodiment of the present application.

[0073] As shown in FIG6 , the battery cell disclosed in the present application includes: a battery cell 10, on the surface of which a plurality of fine grid lines 20 extending along a first direction A and arranged at intervals along a second direction B are provided, wherein the second direction B is perpendicular to the first direction A; a plurality of first glue point columns 40, each of which extends along the second direction B, and the plurality of first glue point columns 40 are arranged at intervals along the first direction A; each first glue point column 40 includes a plurality of glue points 43, and each glue point 43 is provided between two adjacent fine grid lines 20; the plurality of fine grid lines 20 include a plurality of first glue point columns 40, each of which extends along the second direction B, and the plurality of first glue point columns 40 are arranged at intervals along the first direction A; A fine grid 21, each first fine grid 21 is provided with a plurality of thickened sections 30; the glue dots 43 include a first glue dot 44, and the first glue dot 44 is located between two adjacent first fine grids 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, two adjacent first fine grids 21 have at most one thickened section 30 at the position adjacent to the first glue dot 44; in the arrangement area of ​​two adjacent first glue dot columns 40, the thickened sections 30 of the first fine grids 21 are arranged in a projection staggered manner along the first direction A.

[0074] As shown in Figures 1 to 6, the solar cell disclosed in the embodiments of the present application includes a solar cell 10. The solar cell 10 is the core component of a photovoltaic module that converts solar energy into electrical energy. The surface of the solar cell 10 is provided with a plurality of fine grid lines 20 extending along a first direction A and spaced apart along a second direction B. The plurality of fine grid lines 20 collects the current generated by the solar cell 10.

[0075] Specifically, during the manufacturing process of the photovoltaic module, a metal paste can be printed on the surface of the cell 10 using screen printing to form a plurality of fine grid lines 20 on the surface of the cell 10 that extend along a first direction A and are spaced apart along a second direction B. The current generated by the cell 10 is collected by the plurality of fine grid lines 20. The fine grid lines 20 are conductive.

[0076] As shown in Figures 1 to 6 , a plurality of first glue dot columns 40 are provided on the surface of the battery cell 10 . Each first glue dot column 40 extends along the second direction B, and the plurality of first glue dot columns 40 are arranged at intervals along the first direction A. 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 provided between two adjacent fine grid lines 20 .

[0077] It should be noted that the plurality of first glue point arrays 40 in the embodiment of the present application are used to connect the plurality of connecting wires 50 to the surface of the cell 10, so that each connecting wire 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 wires 50. The connecting wires 50 are electrically conductive. For example, the connecting wires 30 may be welding ribbons, welding rods, and the like.

[0078] Specifically, during the manufacturing process of the photovoltaic module, after a plurality of fine grid lines 20 are printed on the surface of the cell 10, a plurality of first glue dot columns 40 extending along the second direction B and spaced apart along the first direction A can be printed on the surface of the cell 10 using screen printing. Each first glue dot column 40 includes a plurality of glue dots 43 spaced apart along the second direction B.

[0079] The plurality of fine grid lines 20 include a plurality of first fine grids 21, each of which is provided with a plurality of thickened segments 30. The thickened segments 30 are conductive. Metal paste can be printed on the first fine grids 21 by screen printing to form the plurality of thickened segments 30.

[0080] Optionally, the fine grid lines 20 may also be formed by laser transfer, sputtering, deposition, or the like.

[0081] The glue dots 43 include a first glue dot 44, which is disposed between two adjacent first fine grids 21. The glue dots 43 are non-conductive. In the embodiment of the present application, the first glue dot 44 is disposed between two adjacent first fine grids 21 to prevent the first fine grids 21 from interfering with the electrical connection between the first fine grids 21 and the connecting line 50.

[0082] As shown in Figures 1 to 3 , in the embodiment of the present application, within the arrangement area of ​​each first glue dot column 40 , that is, within a column area that runs through the entire cell 10 along the second direction B, at most one thickened segment 30 is provided between two adjacent first fine grids 21 on both sides of each first glue dot 44 at positions adjacent to the first glue dot 44 along the second direction B.

[0083] That is, along the second direction B, two first fine grids 21 adjacent to the first glue dot 44 are provided with a thickened section 30 adjacent to the first glue dot 44 , or two first fine grids 21 adjacent to the first glue dot 44 are not provided with a thickened section 30 adjacent to the first glue dot 44 .

[0084] In the embodiment of the present application, by providing at most one thickened section 30 along the second direction B on both sides of each first glue dot 44, immediately adjacent to the first glue dot 44, between two adjacent first fine grids 21, within the arrangement area of ​​each first glue dot column 40, a connecting wire 50 can be bonded to the surface of the cell 10 through each first glue dot column 40, with the connecting wire 50 connected to the first fine grid 21 via the thickened section 30. During the cell lamination process, the connecting wire 50 maintains good contact with the first fine grid 21, and the connecting wire 50 is unlikely to separate from the first fine grid 21, thereby improving the photoelectric conversion efficiency and reliability of the cell.

[0085] As shown in Figures 1 to 3, within the arrangement area of ​​two adjacent first glue dot columns 40, the thickened segments 30 of the first fine grids 21 are arranged in a projected staggered manner along the first direction A. Two connecting wires 50 are bonded to the surface of the battery cell 10 via 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 projected staggered manner along the first direction A. This reduces the number of thickened segments 30, allowing two adjacent connecting wires 50 to better connect to multiple first fine grids 21 via the multiple thickened segments 30 arranged in a projected staggered manner along the first direction A. This further improves the reliability of the contact between the connecting wires 50 and the first fine grids 21.

[0086] Optionally, as shown in Figures 1 to 6, in the arrangement area of ​​the first glue dot column 40, along the second direction B, every M first fine grids 21 with thickened segments 30 are separated by N first fine grids 21 without thickened segments 30, where M and N are both integers greater than or equal to 1.

[0087] As shown in Figures 1 to 6 , in the embodiment of the present application, in the arrangement area of ​​the first glue dot row 40, that is, a row area that runs through the entire battery cell 10 along the second direction B, N first fine grids 21 without thickened sections 30 are arranged between every M first fine grids 21 with thickened sections 30 along the second direction B.

[0088] For example, in the arrangement area of ​​the first glue dot array 40, along the second direction B, a first fine grid 21 without a thickened segment 30 is disposed between every two first fine grids 21 with a thickened segment 30. For another example, in the arrangement area of ​​the first glue dot array 40, along the second direction B, two first fine grids 21 without a thickened segment 30 are disposed between every two first fine grids 21 with a thickened segment 30. For another example, in the arrangement area of ​​the first glue dot array 40, along the second direction B, two first fine grids 21 without a thickened segment 30 are disposed between every two first fine grids 21 with a thickened segment 30.

[0089] Of course, the above are only a few specific implementations of the embodiments of the present application and are not intended to limit the embodiments of the present application. In actual use, technicians can set the values ​​of M and N as needed.

[0090] In the embodiment of the present application, within the arrangement area of ​​the first glue dot array 40, along the second direction B, N first fine grids 21 without thickened segments 30 are spaced apart between every M first fine grids 21 with thickened segments 30. This ensures contact reliability between the connecting wires 50 and the first fine grids 21 while further reducing the number of thickened segments 30, thereby lowering the production cost of the battery cell.

[0091] Optionally, as shown in Figure 1, the battery cell includes a first edge 11 and a second edge 12 opposite to each other along a second direction B; the fine grid line 20 also includes: a plurality of second fine grids 22, wherein the plurality of second fine grids 22 are arranged in the area between the first fine grid 21 and the first edge 11 and the area between the first fine grid 21 and the second edge 12; the second fine grid 22 is closer to the first edge 11 and the second edge 12 than the first fine grid 21; the second fine grid 22 is provided with a plurality of thickened sections 30 along the first direction A.

[0092] As shown in FIG1 , the fine grid lines 20 in the embodiment of the present application further include a plurality of second fine grids 22. The plurality of second fine grids 22 are disposed in the region between the first fine grid 21 and the first edge 11 of the cell 10, and in the region between the first fine grid 21 and the second edge 12 of the cell 10. Furthermore, the second fine grids 22 are closer to the first edge 11 and the second edge 12 than the first fine grids 21.

[0093] Among them, the second fine grid 22 is provided with a plurality of thickened segments 30 along the first direction A, so that the connecting wire 50 is connected to the plurality of second fine grids 22 through the plurality of thickened segments 30, so that the connecting wire 50 and the second fine grid 22 have good contact and are not easily separated from each other, thereby improving the photoelectric conversion efficiency of the battery cell 10 and the reliability of the battery cell 10.

[0094] Optionally, as shown in Figures 1, 5 and 6, the battery cell also includes: a plurality of second glue dot columns 41, each second glue dot column 41 extends along the second direction B, and 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 arranged between two adjacent fine grid lines 20; in the arrangement area of ​​the second glue dot columns 41, along the center line of the second glue dot columns 41, each first fine grid 21 and each second fine grid 22 is provided with a thickened section 30.

[0095] In the embodiment of the present application, within the arrangement area of ​​the second glue dot array 41, i.e., a row extending along the second direction B through the entire cell 10, a thickened section 30 is provided on each first fine grid 21 and each second fine grid 22 along the centerline of the second glue dot array 41, i.e., a line formed by connecting the projections of the multiple glue dots 43 in the second glue dot array 41 in a direction perpendicular to the plane of the cell 10. A connecting wire 50 is bonded to the surface of the cell 10 through each second glue dot array 41, such that the connecting wire 50 is connected to each first fine grid 21 and each second fine grid 22 via the thickened section 30. During the cell lamination process, good contact is ensured between the connecting wire 50 and each first fine grid 21 and each second fine grid 22, preventing the connecting wire 50 from separating from the first fine grid 21 and the second fine grid 22. This improves the photoelectric conversion efficiency and reliability of the cell 10 within the arrangement area of ​​the second glue dot array 41.

[0096] Optionally, as shown in Figures 1, 5 and 6, the battery cell 10 includes a third edge 13 and a fourth edge 14 opposite to each other along a first direction A, wherein a plurality of first glue point columns 40 are arranged between the third edge 13 and the fourth edge 14; at least one second glue point column 41 is arranged at a position between the plurality of first glue point columns 40 and the third edge 13, at least one second glue point column 41 is arranged at a position between the plurality of first glue point columns 40 and the fourth edge 14, and at least one second glue point column 41 is arranged at a central position of the plurality of first glue point columns 40.

[0097] As shown in FIG1 , 18 glue point columns can be arranged between the first edge 13 and the second edge 14 of the battery cell 10, including 14 first glue point columns 40 and 4 second glue point columns 41. One second glue point column 41 is arranged between the 14 first glue point columns 40 and the third edge 13, one second glue point column 41 is arranged between the 14 first glue point columns 40 and the fourth edge 14, and two second glue point columns 41 are arranged in the center of the 14 first glue point columns 40.

[0098] Of course, the above is only an example of the number and arrangement of the first glue point array 40 and the second glue point array 41, and is not intended to be limiting of this application. In actual use, technicians can arrange the first glue point array 40 and the second glue point array 41 on the surface of the battery cell 10 as needed.

[0099] Optionally, when the sum of the numbers of the first glue dot column 40 and the second glue dot column 41 is an odd number, the number of the second glue dot column 41 set at the center position of the first glue dot column 40 is 1 or 3; when the sum of the numbers of the first glue dot column 40 and the second glue dot column 41 is an even number, the number of the second glue dot column 41 set at the center position of the first glue dot column 40 is 2 or 4.

[0100] In the embodiment of the present application, if the sum of the number of first glue dot columns 40 and second glue dot columns 41 is an odd number, the number of second glue dot columns 41 disposed in the center of the first glue dot columns 40 is set to 1 or 3. If the sum of the number of first glue dot columns 40 and second glue dot columns 41 is an even number, the number of second glue dot columns 41 disposed in the center of the first glue dot columns 40 is set to 2 or 4. This allows the first glue dot columns 40 and second glue dot columns 41 on the battery cell 10 to be symmetrically arranged along the center line of the battery cell 10, thereby reducing stress and improving the aesthetics of the battery cell.

[0101] Optionally, as shown in Figure 1, the fine gate line 20 also includes: multiple third fine gates 23, wherein the multiple third fine gates 23 are arranged in the area between the first fine gate 21 and the first edge 11 and the area between the first fine gate 21 and the second edge 12; the multiple third fine gates 23 are arranged between two second fine gates 22, and along the second direction B, no second fine gates 22 are arranged between the multiple third fine gates 23.

[0102] As shown in FIG1 , the fine grid lines 20 in the embodiment of the present application further include a plurality of third fine grids 23 . The plurality of third fine grids 23 are disposed in the region between the first fine grid 21 and the first edge 11 of the cell 10 , and in the region between the first fine grid 21 and the second edge 12 of the cell 10 . Furthermore, along the second direction B, the plurality of third fine grids 23 are disposed between two second fine grids 22 , and no second fine grids 22 are disposed between the plurality of third fine grids 23 . Optionally, as shown in FIG1 and FIG3 to FIG5 , no thickened sections 30 are disposed on the third fine grids 23 . This reduces the number of thickened sections 30 provided, thereby reducing the production cost of the cell 10 while ensuring the photoelectric conversion efficiency and reliability of the cell 10 , thereby improving the product's competitive advantage.

[0103] In other words, in the arrangement area of ​​the first glue dot row 40 and the second glue dot row 41 , along the center line of the first glue dot row 40 and the second glue dot row 41 , each third fine grid 23 is not provided with a thickened section 30 .

[0104] As shown in Figures 1 and 3 to 5, 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, the multi-column area that runs through the entire cell 10 along the second direction B. Along the centerline 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 along a direction perpendicular to the plane of the cell 10, and on the straight line formed by connecting the projections of the multiple glue dots 43 in the second glue dot column 41 along a direction perpendicular to the plane of the cell 10, each third fine grid 23 is not provided with a thickened segment 30. This reduces the number of thickened segments 30, thereby reducing the production cost of the cell 10 while ensuring the photoelectric conversion efficiency and reliability of the cell 10, thereby improving the product's competitive advantage.

[0105] Optionally, as shown in FIG. 1 and FIG. 3 to FIG. 5 , in the arrangement area of ​​the first glue dot column 40 and the second glue dot column 41 , thickened sections 30 are provided on the second fine grid 22 along the center lines of the first glue dot column 40 and the second glue dot column 41 .

[0106] As shown in Figures 1 and 3 to 5, in the embodiment of the present application, within the arrangement area of ​​the first glue dot column 40 and the second glue dot column 41, i.e., within the multiple columns extending through the entire cell 10 along the second direction B, each second fine grid 22 is provided with a thickened section 30 along the centerline of the first glue dot column 40 and the second glue dot column 41, i.e., along the line formed by connecting the projections of the multiple glue dots 43 in the first glue dot column 40 along a direction perpendicular to the plane of the cell 10, and along the line formed by connecting the projections of the multiple glue dots 43 in the second glue dot column 41 along a direction perpendicular to the plane of the cell 10. Thus, each connecting line 50 is connected to the multiple second fine grids 22 via the multiple thickened sections 30, ensuring good contact between each connecting line 50 and the multiple second fine grids 22 and preventing separation between the connecting line 50 and the second fine grids 22, thereby improving the photoelectric conversion efficiency and reliability of the cell 10.

[0107] Optionally, as shown in Figures 1 and 3 to 5, the first glue dot column 40 and the second glue dot column 41 include multiple second glue dots 45, and 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 two adjacent third fine grids 23, wherein at least one second glue dot 45 partially covers the third fine grid 23.

[0108] As shown in Figures 1 and 3 to 5, second glue dots 45 are also provided in the first glue dot column 40 and the second glue dot column 41 in the embodiment of the present application. The second glue dots 45 are provided between adjacent second fine grids 22 and third fine grids 23, and / or between two adjacent third fine grids 23. Furthermore, the second glue dots 45 include a plurality of them, with at least one second glue dot 45 partially covering the third fine grid 23. In other words, the second glue dots 45 are relatively large in size so that the ends of the connecting wires 50 can be stably connected to the surface of the cell 10 via the larger second glue dots 50, thereby preventing the ends of the connecting wires 50 from detaching from the surface of the cell 10, which could affect the photoelectric conversion efficiency and reliability of the cell 10.

[0109] As an optional embodiment, as shown in Figures 1 and 3 to 5, the glue point 43 on the battery cell 10 closest to the first edge 11 and the second edge 12 is a third glue point 46, and the size of each third glue point 46 is larger than that of the other glue points 43.

[0110] As shown in FIG1 and FIG3 to FIG5, in the embodiment of the present application, the glue spots 43 closest to the first edge 11 and the second edge 12 on the battery cell 10 are referred to as third glue spots 46. The size of each third glue spot 46 is set to be larger than the size of the other glue spots 43, so that the end of the connecting wire 50 is firmly connected to the surface of the battery cell 10 through the third glue spots 46 closest to the first edge 11 and the second edge 12, thereby improving the reliability of the battery cell 10.

[0111] Optionally, as shown in Figures 1 and 5, the surface of the battery cell 10 includes a first surface 15 and a second surface 16, wherein the projection of the glue point 43 located on the first surface 15 along the direction perpendicular to the battery cell 10 and the projection of the glue point 43 located on the second surface 16 along the direction perpendicular to the battery cell 10 are offset from each other.

[0112] Figure 1 shows the arrangement of the glue dots 43 on the first surface 15 of the battery cell 10, and Figure 5 shows the arrangement of the glue dots 43 on the second surface 16 of the battery cell 10. The projections of the glue dots 43 on the first surface 15 along a direction perpendicular to the battery cell 10 and the projections of the glue dots 43 on the second surface 15 along a direction perpendicular to the battery cell 10 are offset from each other.

[0113] During the manufacturing process of the photovoltaic module, it is necessary to first screen-print multiple glue dots 43 on the first surface 15 of the cell 10. Then, screen-print multiple glue dots 43 on the second surface 16 of the cell 10. During the printing process, since the first surface 15 of the cell 10 is unsupported, in order to avoid the multiple glue dots 43 on the first surface 15, the multiple glue dots 43 on the second surface 16 are offset from the multiple glue dots 43 on the first surface 15 along a projection perpendicular to the cell 10.

[0114] In the embodiment of the present application, the projection of the glue dots 43 on the first surface 15 of the cell 10 in a direction perpendicular to the cell 10 and the projection of the glue dots 43 on the second surface 16 of the cell 10 in a direction perpendicular to the cell 10 may at least partially overlap. This facilitates printing the glue dots 43 on the first surface 11 and the second surface 12 of the cell 10 by screen printing during the manufacturing process of the photovoltaic module.

[0115] Optionally, as shown in FIG. 1 to FIG. 6 , along the second direction B, the distance between two adjacent thin gate lines 20 is L, and the length of the glue dot 43 is L1, wherein 0.6L≤L1≤0.9L.

[0116] As shown in Figures 1 to 6, along the second direction B, the distance between two adjacent fine grid lines 20 is set to L, the length of the glue dot 43 is set to L1, and L1 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 L1 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 20 is sufficient to connect the connecting line 50 to the surface of the battery cell 10. Because the glue dot 43 is not conductive, the length L1 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 20 can be set between two adjacent fine grid lines 20, avoiding the glue dot 43 affecting the electrical connection between the connecting line 50 and the fine grid lines 20.

[0117] For example, in the embodiment of the present application, L1 can be set to 0.6 L, 0.7 L, 0.8 L, or 0.9 L. In this regard, there is no specific limitation in the embodiment of the present application. In actual use, technicians can set it as needed.

[0118] Optionally, as shown in FIG. 1 to FIG. 6 , along the second direction B, the distance L2 between the glue dot 43 and the adjacent thickened section 30 is, wherein L2 ≥ 0.15L.

[0119] As shown in Figures 1 to 6, along the second direction B, the distance between the glue dot 43 and the adjacent thickened segment 30 is set to L2, and L2 is set to be greater than or equal to 0.15 times the distance L between two adjacent fine gate lines 20. This prevents the glue dot 43 from affecting the electrical connection between the connecting line 50 and the thickened segment 30.

[0120] For example, the distance L2 between the glue dot 43 and the adjacent thickened segment 30 can be set to be equal to 0.15 times the distance L between two adjacent fine grid lines 20, the distance L2 between the glue dot 43 and the adjacent thickened segment 30 can be set to be equal to 0.2 times the distance L between two adjacent fine grid lines 20, or the distance L2 between the glue dot 43 and the adjacent thickened segment 30 can be set to be equal to 0.25 times the distance L between two adjacent fine grid lines 20. In this regard, there is no specific limitation in the embodiments of the present application. In actual use, technicians can make settings as needed.

[0121] Optionally, the surface of the battery cell 10 includes a first surface 15 and a second surface 16, wherein the first fine grid 21 located on the first surface 15 satisfies M=1 or 2, and N=1 or 2; and / or the first fine grid 21 located on the second surface 16 satisfies M=1 or 2, and N=1 or 2.

[0122] As shown in Figures 1 to 6 , in the arrangement area of ​​the first glue dot array 40, along the second direction B, the plurality of first fine grids 21 on the first surface 15 and the second surface 16 of the cell 10 meet the following conditions: every M first fine grids 21 with thickened sections 30 are separated by N first fine grids 21 without thickened sections 30. Here, M = 1 or 2, and N = 1 or 2.

[0123] For example, in the arrangement area of ​​the first glue dot array 40, along the second direction B, two first fine grids 21 without thickened sections 30 are spaced apart from each other. For another example, two first fine grids 21 without thickened sections 30 are spaced apart from each other. For another example, one first fine grid 21 without thickened sections 30 is spaced apart from each other.

[0124] In the embodiment of the present application, within the arrangement area of ​​the first glue dot array 40, along the second direction B, N first fine grids 21 without thickened segments 30 are spaced apart between every M first fine grids 21 with thickened segments 30. This ensures contact reliability between the connecting wires 50 and the first fine grids 21 while further reducing the number of thickened segments 30, thereby lowering the production cost of the battery cell.

[0125] The battery cell 10 in the embodiment of the present application can be a battery cell without a busbar or a battery cell with a busbar. In actual use, technicians can make a choice according to their needs.

[0126] In the case where the battery cell 10 is a battery cell with a main grid, a plurality of main grids extending along the second direction B and arranged at intervals along the first direction A are provided on the surface of the battery cell 10, and each glue point 43 is located above the plurality of main grids, so that the connecting line 50 is connected to the main grid through the plurality of glue points 43 located above a main grid, thereby collecting the current collected by the fine grid lines through the main grid, and the collected current is aggregated through the connecting line 50.

[0127] The battery cell 10 in the embodiment of the present application is generally a rectangular structure, and the specific dimensions of the battery cell 10 of the rectangular structure 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.

[0128] Of course, in the embodiment of the present application, there is no limitation on the specific structure and size of the battery cell 10. Battery cells 10 of any structure and any size fall within the scope of protection of the present application. In actual use, technicians can select a suitable battery cell as the battery cell 10 as needed.

[0129] The cell 10 in the embodiment of the present application may be 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, and the like.

[0130] Likewise, in the embodiment of the present application, there are no excessive restrictions on the specific type of the battery cell 10. In actual use, technicians can choose according to their needs.

[0131] It should be noted that the glue dots 43 in the embodiment of the present application are generally made of non-conductive material and do not have electrical conductivity. Therefore, they are also called non-conductive glue dots.

[0132] An embodiment of the present application discloses a battery cell, which includes: a battery cell, on the surface of which are provided a plurality of 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 of which extends along the second direction and is arranged at intervals along the first direction; each of the first glue dot columns includes a plurality of glue dots, each of which is arranged between two adjacent fine grid lines; the plurality of fine grid lines include a plurality of first fine grids, each of which is provided with a plurality of thickened segments; the glue dots include a first glue dot, which is 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 first glue dot, two adjacent first fine grids adjacent to the first glue dot have at most one thickened segment in total; in the arrangement area of ​​two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a projection-staggered manner along the first direction.

[0133] The cell disclosed in this application provides multiple thickened sections on each first fine grid, and places a first glue point between two first fine grids. Within the arrangement area of ​​each first glue point column, at most one thickened section is provided immediately adjacent to the first glue point on both sides of each first glue point along the second direction. This allows a connecting wire to be bonded to the surface of the cell through each first glue point column, connecting the connecting wire to the first fine grid via the thickened sections. During the cell lamination process, the connecting wire and the first fine grid maintain good contact and are unlikely to separate, thereby improving the cell's photoelectric conversion efficiency and reliability.

[0134] Furthermore, within the arrangement area of ​​two adjacent first glue dot columns, the thickened segments of the first fine grids are arranged in a projected staggered manner along the first direction. Two connecting wires are bonded to the surface of the cell via 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 projected staggered manner along the first direction. This reduces the number of thickened segments, allowing two adjacent connecting wires to better connect to multiple first fine grids via the multiple thickened segments arranged in a projected staggered manner along the first direction. This further improves the reliability of contact between the connecting wires and the first fine grids.

[0135] The embodiment of the present application further discloses a battery string, which includes at least two battery cells 10 as described in the above embodiment; and a connecting wire 50 , which electrically connects the at least two battery cells 10 .

[0136] 6 , there is shown a schematic structural diagram of the battery string according to an embodiment of the present application.

[0137] As shown in Figure 6, the battery string disclosed in the embodiment of the present application includes at least two battery cells 10 in the above-mentioned embodiment and multiple connecting wires 50. At least two battery cells 10 are arranged at intervals, and at least two battery cells 10 are electrically connected by multiple connecting wires 50, so that the current generated by multiple battery cells 10 is collected through the connecting wires 50.

[0138] 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, which will not be repeated here.

[0139] Optionally, the surface of the battery cell 10 includes a first surface 15 and a second surface 16, wherein the connecting wire 50 passes through the gap between two adjacent battery cells 10, with a portion electrically connected to the first surface 15 of one battery cell 10 and another portion electrically connected to the second surface 16 of the other battery cell 10.

[0140] Typically, 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 the at least two battery cells 10 are both oriented in one direction, and the second surfaces 16 are both oriented in another direction.

[0141] The connecting wire 50 in the embodiment of the present application passes through the gap between two adjacent battery cells 10, and a portion is electrically connected to the first surface 15 of one of the two adjacent battery cells 10, and the other portion is electrically connected to the second surface 16 of the other of the two adjacent battery cells 10, thereby connecting the two adjacent battery cells 10 in series to collect the current generated by the two adjacent battery cells 10.

[0142] Optionally, as shown in FIG. 6 , the connecting wires 50 include a plurality of connecting wires 50 , and the plurality of connecting wires 50 extend along the second direction B and are arranged along the first direction A at intervals.

[0143] As shown in FIG6 , the battery string in the embodiment of the present application includes a plurality of connecting wires 50 , which extend along the second direction B and are arranged at intervals along the first direction A. The current generated by two adjacent battery cells 10 is collected through the plurality of connecting wires 50 , so as to collect as much current as possible from the two adjacent battery cells 10 .

[0144] Optionally, as shown in FIG. 6 , the connection wire 50 is connected to the surface of the battery cell 10 via glue dots 43 .

[0145] As shown in FIG6 , each connecting line 50 in the embodiment of the present application is connected to the surface of the battery cell 10 via a row of glue dots 43. Specifically, the row of glue dots 43 can be a first glue dot row 40 or a second glue dot row 41. Multiple connecting lines 50 are provided in a one-to-one correspondence with multiple first glue dot rows 40 and multiple second glue dot rows 41.

[0146] The embodiments of the present application further disclose a photovoltaic module, which includes a plurality of battery strings as described in the above embodiments, and the plurality of battery strings are arranged at intervals.

[0147] 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, which will not be repeated here.

[0148] Referring to Figure 8, a structural schematic diagram of the battery string described in an embodiment of the present application is shown; referring to Figure 9, a cross-sectional view of the battery string along the extension direction of the connecting line in an embodiment of the present application is shown; referring to Figure 10, a cross-sectional view of the glue point described in an embodiment of the present application is shown; referring to Figure 11, a cross-sectional view of the connecting line after being embedded in the glue point along the extension direction perpendicular to the connecting line in an embodiment of the present application is shown; referring to Figure 12, a local cross-sectional view of the photovoltaic component at the glue point along the extension direction perpendicular to the connecting line in an embodiment of the present application is shown; referring to Figure 13, a local cross-sectional view of the photovoltaic component at the glue point along the extension direction perpendicular to the connecting line in an embodiment of the present application is shown; referring to Figure 14, a local cross-sectional view of the photovoltaic component at a non-glue point along the extension direction perpendicular to the connecting line in an embodiment of the present application is shown; referring to Figure 15, a local cross-sectional view of the photovoltaic component at a non-glue point along the extension direction of the connecting line in an embodiment of the present application is shown.

[0149] As shown in Figures 8 to 15, an embodiment of the present application provides a battery string, which includes: a battery cell 10, on which a plurality of fine grid lines 20 extending along a first direction A and arranged at intervals along a second direction B are provided; a plurality of connecting lines 50, which extend along the second direction B and are arranged at intervals along the first direction A, and each connecting line 50 is connected to the surface of the battery cell 10 through a plurality of glue points 43 arranged at intervals, and the second direction B is perpendicular to the first direction A; wherein, along the direction perpendicular to the plane where the battery cell 10 is located, the glue point 43 is an arc-shaped protrusion, and the height of the arc-shaped protrusion is less than or equal to 200μm, and along the first direction A and the second direction B, the length of the arc-shaped protrusion is greater than or equal to 1mm and less than or equal to 2mm.

[0150] As shown in Figure 8, the battery string disclosed in the embodiments of the present application includes a cell 10, which is the core component of a photovoltaic module and can convert solar energy into electrical energy. The cell 10 is provided with a plurality of fine grid lines 20 extending along a first direction A and spaced apart along a second direction B. The multiple fine grid lines 20 collect the current generated by the cell 10.

[0151] Specifically, during the battery string manufacturing process, metal paste can be printed on the surface of the battery cell 10 using screen printing to form a plurality of fine grid lines 20 spaced apart on the surface of the battery cell 10. The current generated by the battery cell 10 is collected by the plurality of fine grid lines 20. The fine grid lines 20 are conductive.

[0152] As shown in FIG8 , the battery string disclosed in the embodiment of the present application further includes a plurality of connecting wires 50 , each of which extends along a second direction B and is arranged at intervals along the first direction A. Each connecting wire 50 is connected to the surface of the battery cell 10 via a plurality of glue points 43 arranged at intervals. The second direction B is perpendicular to the first direction A.

[0153] Specifically, during the battery string manufacturing process, after printing a plurality of fine grid lines 20 on the surface of the battery cell 10, screen printing can be used to form a plurality of glue dot columns extending along the second direction B and spaced apart along the first direction A on the surface of the battery cell 10. Multiple glue dots 43 are spaced apart within each glue dot column. A connecting wire 50 is bonded to the surface of the battery cell 10 through each glue dot column. Each connecting wire 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 each connecting wire 50.

[0154] It should be noted that the connecting wire 50 in the embodiment of the present application has a conductive property. For example, the connecting wire 50 can be a welding strip, a welding rod, etc.

[0155] The glue spot 43 is an arc-shaped protrusion in a direction perpendicular to the plane of the cell 10, with a height of less than or equal to 200 μm. The length of the arc-shaped protrusion in the first direction A and the second direction B is greater than or equal to 1 mm and less than or equal to 2 mm.

[0156] It should be noted that when the glue is screen-printed onto the surface of the cell 10 to form the glue dots 43, the glue has a certain fluidity, so the shapes of the glue dots 43 are irregular. In the embodiments of the present application, there are no restrictions on the specific shapes of the glue dots 43, and glue dots 43 of any shape fall within the scope of protection of this application.

[0157] In the embodiment of the present application, the height of the glue dot 43 is set to be less than or equal to 200 μm along the direction perpendicular to the plane of the battery cell 10. The length of the arc-shaped protrusion along the first direction A and the second direction B is set to be greater than or equal to 1 mm and less than or equal to 2 mm.

[0158] For example, along a direction perpendicular to the plane of the cell 10 , the height of the glue dot 43 can be set to 100 μm, 120 μm, 150 μm, 170 μm, 190 μm, 200 μm, etc. Along the first direction A and the second direction B, the length of the arc-shaped protrusion can be set to 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0159] The battery string disclosed in the embodiment of the present application connects the connecting wire 50 to the surface of the battery cell 10 through a plurality of glue dots 43 arranged at intervals. The glue dots 43 are arc-shaped protrusions with a height less than or equal to 200 μm. The length of the arc-shaped protrusion along the first direction A and the second direction B is greater than or equal to 1 mm and less than or equal to 2 mm.

[0160] During the processing of the battery string, the glue point 43 can connect the connecting wire 50 to the surface of the battery cell 10 more firmly, so that the distance between the connecting wire 50 at the connection point 43 and the surface of the battery cell 10 is moderate. The connecting wire 50 can be connected to more fine grid lines 20 to collect more current collected by the fine grid lines 20, thereby improving the photoelectric conversion efficiency of the battery string. The connecting wire 50 at the connection point 43 is not far from the surface of the battery cell 10, which makes it impossible for the connecting wire 50 to connect to the multiple fine grid lines 20 on both sides of the glue point 43, and the connecting wire 50 is unable to collect the current collected by the multiple fine grid lines 20 on both sides of the glue point 43.

[0161] As an optional embodiment, as shown in FIG9 and FIG11 , each connecting line 50 is at least partially embedded in a plurality of glue dots 43 spaced apart along the second direction B in a direction perpendicular to the plane where the battery cell 10 is located.

[0162] As shown in Figures 9 and 11, each connecting line 50 is partially embedded in a plurality of glue points 43 spaced apart along the second direction B in a direction perpendicular to the plane where the battery cell 10 is located, so that the connecting line 50 is more firmly connected to the surface of the battery cell 10 through the plurality of glue points 43 spaced apart along the second direction B.

[0163] As an optional embodiment, as shown in FIG9 and FIG11 , along a direction perpendicular to the plane where the battery cell 10 is located, the depth of the connecting wire 50 embedded in the glue spot 43 accounts for 40% to 100% of the height of the glue spot 43 .

[0164] As shown in FIG9 and FIG11 , the depth of the connecting wire 50 embedded in the glue spot 43 is set to 40% to 100% of the height of the glue spot 43 in a direction perpendicular to the plane of the battery cell 10 , so as to make the connection between the connecting wire 50 and the glue spot 43 more reliable.

[0165] Specifically, along the direction perpendicular to the plane of the battery cell 10 , the depth of the connecting wire 50 embedded in the glue spot 43 can be set to 40%, 50%, 60%, 70%, 80%, 90%, 100%, etc. of the height of the glue spot 43 .

[0166] As an optional implementation, as shown in FIG9 , the cross section of the connecting line 50 along the second direction B is a wavy structure.

[0167] As shown in FIG9 , the cross-section of the connecting line 50 along the second direction B exhibits a wavy structure. Specifically, the wavy structure includes a raised segment 51 and a horizontal segment 52. The connecting line 50 where it connects to the glue point 43 is a raised segment 51, and the connecting line 50 between two adjacent raised segments 51 is a horizontal segment 52. Furthermore, along the second direction B, both ends of the connecting line 50 are horizontal segments 52.

[0168] That is, along the second direction B, each connecting line 50 includes a plurality of arched segments 51 and a plurality of horizontal segments 52 , the arched segments 51 and the horizontal segments 52 are arranged one by one at intervals, and the plurality of arched segments 51 and the plurality of horizontal segments 52 are connected to form the connecting line 50 .

[0169] As an optional embodiment, as shown in FIG9 , along the second direction B, the connecting line 50 connected to the glue point 43 forms a raised section 51 , and the distance between the side of the raised section 51 close to the battery cell 10 and the surface of the battery cell 10 is less than or equal to 200 μm.

[0170] As shown in Figure 9, in this embodiment of the present application, the distance between the side of the arched section 51 close to the cell 10 and the side of the cell 10 close to the connecting wire 50 is set to be less than or equal to 200μm. This moderate distance between the arched section 51 and the surface of the cell 10 allows the connecting wire 50 to connect to more fine grid lines 20, thereby collecting more current collected by the fine grid lines 20 and improving the photovoltaic conversion efficiency of the cell string.

[0171] Furthermore, the distance between the arched section 51 and the surface of the solar cell 10 is moderate, which can also prevent defects such as the solar cell 10 being broken due to the arched section 51 being too high during the lamination process of the photovoltaic module.

[0172] For example, the distance between the side of the arched section 51 close to the battery cell 10 and the surface of the battery cell 10 close to the connecting line 50 can be set to 180 μm, 160 μm, 140 μm, 120 μm, 100 μm, 80 μm, etc. In this regard, the embodiment of the present application does not impose too many restrictions, and in actual use, technicians can set it as needed.

[0173] As an optional implementation, as shown in FIG. 9 , along the second direction B, the arched segment 51 spans over two adjacent fine grid lines 20 .

[0174] During the battery string processing, glue dots 43 are typically placed between two adjacent thin grid lines 20. As shown in FIG9 , in this embodiment of the present application, along the second direction B, the arched segment 51 spans two adjacent thin grid lines 20. In other words, along the second direction B, the length of the arched segment 51 is equivalent to the distance between the two adjacent thin grid lines 20.

[0175] Therefore, in the embodiment of the present application, only the fine grid lines 20 corresponding to the arched segments 51 are not connected to the connecting lines 50, while the fine grid lines 20 corresponding to the horizontal segments 52 are all connected to the connecting lines 50. This allows the connecting lines 50 to be connected to more fine grid lines 20, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0176] As an optional embodiment, as shown in Figure 9, along the second direction B, the connecting line 50 between two adjacent arched segments 51 is a horizontal segment 52, the horizontal segment 52 is connected to the surface of the battery cell 10, and the horizontal segment 52 is electrically connected to at least one fine grid line 20.

[0177] As shown in FIG9 , along the second direction B, the horizontal segment 52 is connected to the surface of the cell 10 and electrically connected to at least one fine grid line 20 , so as to collect the current collected by the at least one fine grid line 20 through the horizontal segment 52 .

[0178] As an optional embodiment, as shown in Figures 8 and 9, the connecting line 50 has a first projection on the battery cell 10 along a direction perpendicular to the plane where the battery cell 10 is located, and the length of the first projection is L1; along the second direction B, the sum of the lengths of the horizontal segments 52 is L2, where 0.7L1≤L2≤0.9L1.

[0179] As shown in Figure 8, along a direction perpendicular to the plane where the battery cell 10 is located, the connecting line 50 has a first projection on the battery cell 10, and the length of the first projection is set to L1. Along the second direction B, the sum of the lengths of the horizontal segments 52 of the connecting line 50 is set to L2. In this embodiment, L2 is set to be greater than or equal to 0.7L1, and L2 is less than or equal to 0.9L1. In this way, the length of the horizontal segment 52 of the connecting line 50 along the second direction B is long enough, and the connecting line 50 can be connected to more fine grid lines 20 to collect more currents collected by the fine grid lines 20, thereby improving the photoelectric conversion efficiency of the battery string.

[0180] For example, L2 can be set to be equal to 0.7L1, or L2 can be set to be equal to 0.8L1, or L2 can be set to be equal to 0.9L1. Of course, the above are only individual examples of the embodiments of the present application and are not intended to be limiting of the present application. In actual production, technicians can set the length of the horizontal section 52 as needed.

[0181] As an optional embodiment, as shown in Figure 9, along the second direction B, the glue point 43 is at least partially arranged between two adjacent fine grid lines 20; along the direction perpendicular to the plane where the battery cell 10 is located, there is a gap between the connecting line 50 and the two fine grid lines 20 closest to the glue point 43 along the second direction B.

[0182] During the processing of the battery string, the glue dots 43 are usually disposed between two adjacent thin grid lines 20. Of course, there are also cases where a portion of the glue dots 43 is disposed between two adjacent thin grid lines 20 and another portion is disposed on an adjacent thin grid line 20.

[0183] As shown in FIG9 , along a direction perpendicular to the plane of the cell 10, a gap exists between the connecting wire 50 and the two thin grid lines 20 closest to the glue spot 43 along the second direction B. More specifically, a gap exists between the arched section 51 of the connecting wire 50 and the two thin grid lines 20 closest to the glue spot 43 along the second direction B. In other words, the arched section 51 in the embodiment of the present application is not connected to the thin grid lines 20 on both sides of the corresponding glue spot 43.

[0184] Optionally, as shown in FIG. 9 , along the second direction B, there is a first gap between two adjacent fine grid lines 20 , and the glue dots 43 are disposed in the first gap.

[0185] As shown in FIG9 , as an optional embodiment, glue dots 43 are disposed in the first gap between two adjacent fine grid lines 20 along the second direction B. The glue dots 43 are generally non-conductive and are disposed in the first gap between two adjacent fine grid lines 20 to prevent the glue dots 43 from affecting the electrical connection between the connecting wire 50 and the fine grid lines 20.

[0186] As an optional embodiment, as shown in Figures 12 and 14, the connecting line 50 includes a connecting line base 53 and a metal layer 54 attached to the surface of the connecting line base 53, wherein the metal layer 54 on the side close to the battery cell 10 is electrically connected to multiple fine grid lines 20.

[0187] As shown in Figures 12 and 14 , the connecting wire 50 includes a connecting wire base 53 and a metal layer 54 attached to the surface of the connecting wire base 53. Both the connecting wire base 53 and the metal layer 54 are electrically conductive. The connecting wire base 53 is typically a copper strip. Of course, other metal strips, such as aluminum strip, may also be used. This is not a specific limitation.

[0188] In the embodiment of the present application, the metal layer 54 on the side close to the battery cell 10 is electrically connected to the plurality of fine grid lines 20 , so that the connecting line 50 is electrically connected to the plurality of fine grid lines 20 , and the current collected by the plurality of fine grid lines 20 is collected.

[0189] As an optional embodiment, as shown in FIG. 15 , the cell 10 further includes a TCO layer 17 , wherein the metal layer 54 of the horizontal section 52 of the connecting line 50 close to the side of the cell 10 abuts against the TCO layer 17 .

[0190] As shown in Figure 15 , a TCO layer 17, also known as a transparent conductive layer, is provided on the side of the cell 10 near the connecting wire 50. The metal layer 54 of the horizontal segment 52 of the connecting wire 50, which is located near the cell 10, abuts against the TCO layer 17. This electrically connects the horizontal segment 52 of the connecting wire 50 to the TCO layer 17 of the cell 10, allowing the current generated by the cell 10 to be collected through the horizontal segment 52 of the connecting wire 50.

[0191] As an optional embodiment, as shown in FIG14 , along a direction perpendicular to the plane of the cell 10 , the fine grid line 20 is at least partially embedded in the metal layer 54 on the side of the horizontal section 52 of the connecting line 50 close to the cell 10 .

[0192] 14 , there is shown a partial cross-sectional view of the horizontal section 52 of the connecting line 50 in the embodiment of the present application.

[0193] As shown in Figure 14, along the direction perpendicular to the plane where the battery cell 10 is located, the fine grid line 20 is partially embedded in the metal layer 54 on the side of the horizontal section 52 of the connecting line 50 close to the battery cell 10, so that the electrical connection between the fine grid line 20 and the connecting line 50 is more reliable, so that the current collected by the fine grid line 20 can be collected through the connecting line 50.

[0194] As an optional embodiment, the melting point of the metal layer 54 is less than 165 degrees. In the embodiment of the present application, the melting point of the metal layer 54 is set to be less than 165 degrees. This allows the metal layer 54 to alloy and interconnect with the fine grid lines 20 during the battery string lamination process.

[0195] Specifically, the metal layer 54 can be a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer. Of course, the metal layer 54 can also be other conductive metal layers with a melting point less than 165 degrees. This application does not impose too many restrictions on this. In actual use, technicians can select a suitable metal layer 54 as needed.

[0196] As an optional implementation manner, the projection of the arc-shaped protrusion in the plane direction where the battery cell 10 is located is a circle, and the diameter of the circle is greater than or equal to 1 mm and less than or equal to 2 mm.

[0197] In the embodiment of the present application, when the projection of the arc-shaped protrusion on the plane of the battery cell 10 is a circle, the diameter of the circle is set to be greater than or equal to 1 mm and less than or equal to 2 mm. This allows the glue point 43 to more firmly connect the connecting wire 50 to the surface of the battery cell 10 during the processing of the battery string.

[0198] For example, the diameter of the circle can be set to 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc. This application does not impose any specific restrictions on this, and technicians can set it as needed during the actual processing process.

[0199] As an optional embodiment, the dimensions of the battery cell 10 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.

[0200] Optionally, the battery cell 10 may be a rectangular structure, and the specific dimensions of the rectangular structure battery cell 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.

[0201] Of course, in the embodiment of the present application, there is no limitation on the specific structure and size of the battery cell 10. Battery cells 10 of any structure and any size fall within the scope of protection of the present application. In actual use, technicians can select a suitable battery cell as the battery cell 10 as needed.

[0202] The present application provides a battery string, comprising: a battery cell, on which a plurality of fine grid lines extending along a first direction and spaced apart along a second direction are provided; a plurality of connecting lines extending along the second direction and spaced apart along the first direction, each of the connecting lines being connected to the surface of the battery cell via a plurality of glue points arranged at intervals, the second direction being perpendicular to the first direction; wherein, along a direction perpendicular to the plane of the battery cell, the glue points are arc-shaped protrusions, the height of the arc-shaped protrusions being less than or equal to 200 μm, and the length of the arc-shaped protrusions along the first and second directions being greater than or equal to 1 mm and less than or equal to 2 mm. The battery string provided in an embodiment of the present application connects the connecting lines to the surface of the battery cell via a plurality of glue points arranged at intervals, the glue points being arc-shaped protrusions, the height of the arc-shaped protrusions being less than or equal to 200 μm, and the length of the arc-shaped protrusions along the first and second directions being greater than or equal to 1 mm and less than or equal to 2 mm. During the battery string processing, the glue point can more firmly connect the connecting wire to the surface of the battery cell, so that the distance between the connecting wire and the glue point and the battery cell surface is moderate. The connecting wire can be connected to more fine grid lines, thereby collecting more current collected by the fine grid lines, thereby improving the photovoltaic conversion efficiency of the battery string. The connecting wire at the glue point is not far away from the surface of the battery cell, which will prevent the connecting wire from being unable to connect with the multiple fine grid lines on both sides of the glue point, and the connecting wire will not be unable to collect the current collected by the multiple fine grid lines on both sides of the glue point.

[0203] As shown in Figures 12 to 15, an embodiment of the present application also provides a photovoltaic module, which includes a cover plate 60, a first adhesive layer 70, multiple battery strings described in the above embodiments, a second adhesive layer, and a back plate arranged in sequence, wherein the multiple battery strings are arranged at intervals.

[0204] The cover plate 60 is connected to one side of the battery string through a first adhesive layer 70 , and the back plate is connected to the other side of the battery string through a second adhesive layer.

[0205] 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, which will not be repeated here.

[0206] As an optional implementation, the first adhesive layer 70 and / or the second adhesive layer is a multi-layer composite adhesive layer.

[0207] As shown in FIG. 12 to FIG. 15 , the first adhesive layer 70 and / or the second adhesive layer in the embodiment of the present application are / is a multi-layer composite adhesive layer, which may include an EVA layer and a POE layer.

[0208] The EVA layer is an ethylene-vinyl acetate copolymer layer, which has water resistance, corrosion resistance, and is easy to process by hot pressing, cutting, gluing, laminating, etc. The POE layer is a polymer layer of ethylene and octene, or a polymer layer of ethylene and butene.

[0209] As an optional implementation, the multi-layer composite adhesive layer is a double-layer structure, including an EVA layer 71 and a POE layer 72 stacked in sequence.

[0210] As shown in Figures 12 to 15, the multi-layer composite adhesive layer has a two-layer structure, including an EVA layer 71 and a POE layer 72 stacked in sequence. The EVA layer 71 is connected to the battery string, that is, the EVA layer directly contacts the battery string. The EVA layer 71 is easy to hot-press, allowing the photovoltaic module to be hot-pressed and formed.

[0211] As an optional implementation, the multi-layer composite adhesive layer is a three-layer structure, including an EVA layer 71, a POE layer 72 and an EVA layer 71 stacked in sequence.

[0212] The multi-layer composite adhesive layer in the embodiment of the present application can also be a three-layer structure, including an EVA layer 71, a POE layer 72, and an EVA layer 71 stacked in sequence. One EVA layer 71 is connected to the battery string, and the other EVA layer 71 is connected to the cover plate 60 or the back plate. This allows the cover plate 60 to be connected to one side of the battery string through the multi-layer composite adhesive layer, and the back plate to be connected to the other side of the battery string through the multi-layer composite adhesive layer by hot pressing.

[0213] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0214] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Furthermore, please note that examples of the phrase "in one embodiment" herein do not necessarily all refer to the same embodiment. In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0215] In the claims, any reference signs placed between brackets shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0216] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, wherein: include: A battery cell, on the surface of which a plurality of fine grid lines extending along a first direction and arranged at intervals along a second direction are arranged, wherein the second direction is perpendicular to the first direction; A plurality of first glue dot columns, each of which extends along the second direction, and the plurality of first glue dot columns are arranged at intervals along the first direction; each of the first glue dot columns includes a plurality of glue dots, and each of the glue dots is arranged between two adjacent fine grid lines; The plurality of fine grid lines include a plurality of first fine grids, each of which is provided with a plurality of thickened segments; The glue dots include a first glue dot, and the first glue dot is 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, two adjacent first fine grids immediately adjacent to the first glue dot have at most one thickened segment; In the arrangement area of ​​two adjacent first glue dot columns, the thickened segments of the first fine grid are arranged in a projection-staggered manner along the first direction.

2. The battery cell according to claim 1, wherein: In the arrangement area of ​​the first glue dot column, along the second direction, every M first fine grids with the thickened segments are spaced apart by N first fine grids without the thickened segments, and both M and N are integers greater than or equal to 1.

3. The battery cell according to claim 2, wherein: The battery sheet includes a first edge and a second edge opposite to each other along the second direction; The fine gate line further includes a plurality of second fine gates, and the plurality of second fine gates are arranged in a region between the first fine gate and the first edge and a region between the first fine gate and the second edge; The second fine grid is closer to the first edge and the second edge than the first fine grid; The second fine grid is provided with a plurality of the thickened segments along the first direction.

4. The battery cell according to claim 3, wherein: The battery cell also includes: A plurality of second glue dot columns, each of which extends along the second direction, and the plurality of second glue dot columns are arranged at intervals along the first direction, and each of which includes a plurality of glue dots. Each of the glue dots is arranged 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 grids and each of the second fine grids is provided with the thickened segment.

5. The battery cell according to claim 4, wherein: The battery sheet comprises a third edge and a fourth edge opposite to each other along the first direction, and the plurality of first glue point columns are arranged between the third edge and the fourth edge; At least one of the second glue dot columns is arranged between the multiple first glue dot columns and the third edge, at least one of the second glue dot columns is arranged between the multiple first glue dot columns and the fourth edge, and at least one of the second glue dot columns is arranged at the central position of the multiple first glue dot columns.

6. The battery cell according to claim 5, wherein: When the sum of the number of the first glue dot row and the number of the second glue dot row is an odd number, the number of the second glue dot row arranged at the center of the first glue dot row is 1 or 3; When the sum of the numbers of the first glue dot array and the second glue dot array is an even number, the number of the second glue dot array disposed at the center of the first glue dot array is 2 or 4.

7. The battery cell according to any one of claims 4 to 6, wherein: The fine gate line further includes a plurality of third fine gates, and the plurality of third fine gates are arranged in a region between the first fine gate and the first edge and a region between the first fine gate and the second edge; The plurality of third fine grids are disposed between two of the second fine grids, and along the second direction, no second fine grid is disposed between the plurality of third fine grids.

8. The battery 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, each of the third fine grids is not provided with the thickened segment.

9. The battery cell according to claim 7, wherein: The thickened section is not provided on the third fine grid.

10. The battery cell according to any one of claims 8 to 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, the thickened segment is arranged on each of the second fine grids.

11. The battery 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 grids and third fine grids, and / or the second glue dots are located between two adjacent third fine grids. At least one of the second glue dots partially covers the third fine grid.

12. The battery cell according to claim 7, wherein: The glue spots on the battery cell closest to the first edge and the second edge are third glue spots, and the size of each of the third glue spots is larger than the sizes of the other glue spots.

13. The battery cell according to any one of claims 1 to 12, wherein: The surface of the battery cell includes a first surface and a second surface, and the projection of the glue point located on the first surface along a direction perpendicular to the battery cell and the projection of the glue point located on the second surface along a direction perpendicular to the battery cell are offset from each other.

14. The battery cell according to any one of claims 1 to 12, wherein: The surface of the battery cell includes a first surface and a second surface. A projection of the glue spot located on the first surface along a direction perpendicular to the battery cell at least partially overlaps with a projection of the glue spot located on the second surface along a direction perpendicular to the battery cell.

15. The battery cell according to any one of claims 1 to 14, wherein: Along the second direction, the distance between two adjacent thin grid lines is L, and the length of the glue dot is L1, 0.6L≤L1≤0.9L.

16. The battery cell according to any one of claims 1 to 15, wherein: Along the second direction, the distance L2 between the glue point and the adjacent thickened segment is L2≥0.15L.

17. The battery cell according to any one of claims 2 to 16, wherein: The surface of the battery cell includes a first surface and a second surface. 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 battery cell according to any one of claims 1 to 17, wherein: The battery cell includes a battery cell without a main grid.

19. The battery cell according to any one of claims 1 to 17, wherein: A plurality of main grids extending along the second direction and arranged at intervals along the first direction are arranged on the surface of the battery cell; Each of the glue dots is located above the plurality of main grids.

20. The battery cell according to any one of claims 1 to 19, wherein: The sizes of the battery cells include: (182±2)mm*(96±1)mm, (192±2)mm*(91±1)mm, (182±2)mm*(91±1)mm, and (182±2)mm*(105±1)mm.

21. The battery cell according to any one of claims 1 to 20, wherein: The battery cell includes one of a heterojunction battery cell, a monocrystalline silicon battery cell, a polycrystalline silicon battery cell, an amorphous silicon battery cell, a copper indium gallium selenide battery cell, a gallium arsenide battery cell, a cadmium telluride battery cell, and a polymer battery cell.

22. The battery cell according to any one of claims 1 to 21, wherein: The glue dots include non-conductive glue dots.

23. A battery string, wherein: include: At least two battery cells according to any one of claims 1 to 22, wherein the battery cells are provided with a plurality of fine grid lines extending along a first direction and arranged at intervals along a second direction; a plurality of connection lines extending along the second direction and arranged at intervals along the first direction, each of the connection lines being connected to the surface of the battery cell through a plurality of glue points arranged at intervals, and the second direction being perpendicular to the first direction; Along the direction perpendicular to the plane where the battery cell is located, the glue spot is an arc-shaped protrusion, the height of the arc-shaped protrusion is less than or equal to 200μm, and along the first direction and the second direction, the length of the arc-shaped protrusion is greater than or equal to 1mm and less than or equal to 2mm.

24. The battery string according to claim 23, wherein: Along a direction perpendicular to the plane where the battery sheet is located, each of the connecting lines is at least partially embedded in a plurality of the glue points spaced apart along the second direction.

25. The battery string according to claim 24, wherein: Along a direction perpendicular to the plane where the battery sheet is located, the depth of the connecting line embedded in the glue spot accounts for 40% to 100% of the height of the glue spot.

26. The battery string according to claim 23, wherein: A cross section of the connecting line along the second direction is a wavy structure.

27. The battery string according to claim 23, wherein: Along the second direction, the connection line connected to the glue point forms an arched section, and a distance between a side of the arched section close to the battery cell and a surface of the battery cell is less than or equal to 200 um.

28. The battery string according to claim 27, wherein: Along the second direction, the arched segment spans over two adjacent thin grid lines.

29. The battery string according to claim 28, wherein: Along the second direction, the connection line between two adjacent arched segments is a horizontal segment, the horizontal segment is connected to the surface of the battery cell, and the horizontal segment is electrically connected to at least one of the fine grid lines.

30. The battery string according to claim 29, wherein: Along a direction perpendicular to the plane where the battery cell is located, the connecting line has a first projection on the battery cell, and the length of the first projection is L1; Along the second direction, the sum of the lengths of the horizontal segments is L2, 0.7L1≤L2≤0.9L1.

31. The battery string according to claim 23, wherein: Along the second direction, the glue dots are at least partially disposed between two adjacent thin grid lines; Along a direction perpendicular to the plane where the battery cell is located, there is a gap between the connecting line and two of the fine grid lines that are closest to the glue point along the second direction.

32. The battery string according to claim 23, wherein: Along the second direction, there is a first gap between two adjacent fine grid lines, and the glue dots are arranged in the first gap.

33. A photovoltaic module, wherein: It comprises a plurality of battery strings as claimed in any one of claims 23 to 32, wherein the plurality of battery strings are arranged at intervals.

34. A photovoltaic module, wherein: It comprises a plurality of battery cells according to any one of claims 1 to 22, wherein the plurality of battery cells are connected to form a battery string.

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