Solar cell and photovoltaic module

Abstract

The invention relates to a solar cell and a photovoltaic module, and the solar cell comprises a cell piece, a grid line module is arranged on the cell piece, the grid line module comprises a main grid structure and an auxiliary grid structure which are stacked, a first marking structure is arranged on the cell piece, the first marking structure is used for marking the main grid structure, a second marking structure is arranged on the cell piece, and the second marking structure is used for marking the auxiliary grid structure. The first marking structure is used for marking the main grid structure, the second marking structure is used for marking the auxiliary grid structure, and orthographic projections of the first marking structure and the second marking structure on the battery piece are located on the periphery of the orthographic projection of the main grid structure on the battery piece and the periphery of the orthographic projection of the auxiliary grid structure on the battery piece. According to the solar cell, a worker can conveniently adopt the first marking structure and the second marking structure at the same position to accurately overlap different main grid structures and auxiliary grid structures in the area, where the grid line assembly is arranged, of the cell piece, so that the marking structures are prevented from being reset, time, manpower and material resources required for manufacturing the solar cell are reduced, and production efficiency is improved. And the manufacturing efficiency of the solar cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] In recent years, with the development of photovoltaic power generation technology, more and more production links have begun to use solar cells for power generation. The front and back sides of the solar cell have metallized patterns, which are made by distributed printing. The metallized patterns include a main grid and a secondary grid. The main grid is printed before the secondary grid, and the secondary grid is subsequently printed and overlapped on the main grid. In related technologies, in order to ensure that the secondary grid is printed and overlapped on the main grid, marking points are respectively provided in the grid line pattern of the main grid layer and the grid line pattern of the secondary grid layer. By making the marking points in the main grid layer overlap with the marking points in the secondary grid layer, accurate overlap of the main grid and the secondary grid is achieved. However, when the grid line pattern in the secondary grid layer or the grid line pattern in the main grid layer changes, the staff is often required to reset the marking points, which is time-consuming, labor-intensive and inefficient. Summary of the invention

[0003] Based on this, it is necessary to provide a solar cell and photovoltaic module to address the problem that when the grid line pattern in the secondary grid layer or the grid line pattern in the main grid layer changes, the staff often need to reset the marking points, which is time-consuming, labor-intensive and inefficient.

[0004] A solar cell, comprising:

[0005] Battery cells;

[0006] A grid line assembly is arranged on the battery cell, and the grid line assembly includes a main grid structure and a secondary grid structure stacked in a direction away from the battery cell:

[0007] A first marking structure, provided on the battery cell, and used to mark the main grid structure;

[0008] A second marking structure, provided on the battery cell, and used to mark the secondary grid structure;

[0009] The orthographic projections of the first marking structure and the second marking structure on the battery cell are both located outside the orthographic projection of the main grid structure on the battery cell and outside the orthographic projection of the auxiliary grid structure on the battery cell.

[0010] In one of the embodiments, the main gate structure includes a main gate extending along a first direction;

[0011] The auxiliary grid structure includes a fine grid and a frame grid line, the fine grid extends along a second direction and intersects with the main grid, the first direction and the second direction are perpendicular to the thickness direction of the battery cell, and the first direction and the second direction intersect;

[0012] The frame grid lines are connected end to end and enclose a grid line area. The main grid and the fine grid are arranged in the grid line area. The first marking structure and the second marking structure are both arranged outside the grid line area.

[0013] In one embodiment, the outer contour line of the battery cell and the frame grid line form a ring-shaped area, and the first marking structure and the second marking structure are both arranged in the ring-shaped area.

[0014] In one embodiment, the first marking structure is a marking point, and the second marking structure is a marking ring;

[0015] The orthographic projection of the marking ring on the battery cell is arranged around the outside of the orthographic projection of the marking point on the battery cell, or the orthographic projection of the marking ring on the battery cell overlaps with a part of the orthographic projection of the marking point on the battery cell.

[0016] In one embodiment, the outer contour of the battery cell is a rectangular frame, and the corners of the rectangular frame are chamfered;

[0017] The area enclosed by the frame grid lines is a rectangle, frame chamfer grid lines corresponding to the chamfers are arranged at the corners of the frame grid lines, the frame chamfer grid lines are parallel to the corresponding chamfers and are arranged at intervals, the frame chamfer grid lines are straight lines, and in the direction away from the center of the battery cell along the first direction, the spacing between the frame chamfer grid lines and the center of the battery cell in the second direction gradually decreases;

[0018] The second marking structure is arranged between the chamfer and the corresponding frame chamfer grid line.

[0019] In one of the embodiments, in the extension direction of the border chamfered grid line, the distance between the second marking structure and two ends of the border chamfered grid line is equal.

[0020] In one embodiment, the distance between the second marking structure and the chamfer is equal to the distance between the second marking structure and the border chamfer grid line.

[0021] In one embodiment, the main grid structure includes a plurality of main grids arranged at intervals along the second direction, each of the main grids includes a thin main grid and a plurality of first pads, the thin main grid extends along the first direction, and the plurality of first pads are arranged at intervals on the thin main grid along the first direction;

[0022] The auxiliary gate structure includes a plurality of the fine gates arranged at intervals along the first direction, each of the fine gates extends along the second direction, and some of the fine gates are electrically connected to the first pad.

[0023] In one embodiment, two ends of the thin main grid are provided with second pads and a busbar connected to the second pads;

[0024] The busbar includes two forked lines, one end of each of the forked lines is connected to the corresponding second solder pad, and the other end is connected to the frame grid line. In the direction away from the center of the battery cell along the first direction, the distance between the two forked lines in each of the busbars in the second direction gradually increases.

[0025] The solar cell in the present embodiment can accurately overlap the main grid structure and the auxiliary grid structure by ensuring the relative position relationship between the first marking structure and the second marking structure. By setting the orthographic projections of the first marking structure and the second marking structure on the cell sheet to be located outside the orthographic projection of the main grid structure on the cell sheet and the orthographic projection of the auxiliary grid structure on the cell sheet, the first marking structure and the second marking structure can be located outside the area where the grid line assembly is set on the cell sheet. Compared with the first marking structure and the second marking structure being located within the area where the grid line assembly is set on the cell sheet, in the solar cell in the present embodiment, even if the main grid structure or the auxiliary grid structure within the area where the grid line assembly is set on the cell sheet changes, the first marking structure and the second marking structure will not overlap with the main grid structure and the auxiliary grid structure within the area where the grid line assembly is set on the cell sheet, thereby facilitating the staff to use the first marking structure and the second marking structure in the same position to accurately overlap different main grid structures and auxiliary grid structures within the area where the grid line assembly is set on the cell sheet, avoiding resetting the marking structure, and ultimately reducing the time, manpower and material resources required for solar cell manufacturing, and improving the manufacturing efficiency of solar cells.

[0026] The present application also proposes a photovoltaic assembly, comprising the aforementioned solar cell, wherein a plurality of the solar cells are connected in series and / or in parallel.

[0027] The photovoltaic module in this embodiment can accurately overlap the main grid structure and the auxiliary grid structure by ensuring the relative position relationship between the first marking structure and the second marking structure. By setting the orthographic projections of the first marking structure and the second marking structure on the battery cell to be located outside the orthographic projection of the main grid structure on the battery cell and the orthographic projection of the auxiliary grid structure on the battery cell, the first marking structure and the second marking structure can be located outside the area where the grid line assembly is set on the battery cell. Compared with the first marking structure and the second marking structure being located within the area where the grid line assembly is set on the battery cell, in the solar cell in this embodiment, even if the main grid structure or the auxiliary grid structure within the area where the grid line assembly is set on the battery cell changes, the first marking structure and the second marking structure will not overlap with the main grid structure and the auxiliary grid structure within the area where the grid line assembly is set on the battery cell, thereby facilitating the staff to use the first marking structure and the second marking structure in the same position to accurately overlap different main grid structures and auxiliary grid structures within the area where the grid line assembly is set on the battery cell, avoiding resetting the marking structure, and ultimately reducing the time, manpower and material resources required for the manufacture of photovoltaic modules, and improving the manufacturing efficiency of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] FIG. 1 is a schematic diagram of the structure of a solar cell in one embodiment of the present application.

[0030] FIG. 2 is a schematic diagram of a secondary grid structure in the solar cell shown in FIG. 1 .

[0031] FIG. 3 is a schematic diagram of a main grid structure in the solar cell shown in FIG. 1 .

[0032] Reference numerals:

[0033] Solar cell 1000;

[0034] Battery cell 1100, chamfer 1110;

[0035] Grid line assembly 1200, main grid structure 1210, main grid 1211, thin main grid 1211-1, first pad 1211-2, second pad 1211-3, bus bar 1211-4, bifurcation line 1211-4-1, lap part 1211-5, bus bar 1211-6, auxiliary grid structure 1220, thin grid 1221, frame grid line 1222, frame chamfered grid line 1223;

[0036] First marking structure 1300;

[0037] Second marking structure 1400 . DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] Please refer to Figures 1 to 3. Figure 1 shows a schematic diagram of the structure of a solar cell in an embodiment of the present application. A solar cell 1000 provided in an embodiment of the present application includes: a cell 1100, a grid line assembly 1200, a first marking structure 1300, and a second marking structure 1400. The grid line assembly 1200 is arranged on the cell 1100. The grid line assembly 1200 includes a main grid structure 1210 and a secondary grid structure 1220 stacked in a direction away from the cell 1100. The first marking structure The first marking structure 1300 is disposed on the battery cell 1100, the first marking structure 1300 is used to mark the main grid structure 1210, the second marking structure 1400 is disposed on the battery cell 1100, the second marking structure 1400 is used to mark the auxiliary grid structure 1220, and the orthographic projections of the first marking structure 1300 and the second marking structure 1400 on the battery cell 1100 are both located outside the orthographic projection of the main grid structure 1210 on the battery cell 1100, and outside the orthographic projection of the auxiliary grid structure 1220 on the battery cell 1100.

[0045] The solar cell 1000 in this embodiment can accurately overlap the main grid structure 1210 and the auxiliary grid structure 1220 by ensuring the relative position relationship between the first marking structure 1300 and the second marking structure 1400. By setting the orthographic projections of the first marking structure 1300 and the second marking structure 1400 on the battery cell 1100 to be located outside the orthographic projection of the main grid structure 1210 on the battery cell 1100 and the orthographic projection of the auxiliary grid structure 1220 on the battery cell 1100, the first marking structure 1300 and the second marking structure 1400 can be located outside the area where the grid line assembly 1200 is set on the battery cell 1100. Compared with the first marking structure 1300 and the second marking structure 1400 being located within the area where the grid line assembly 1200 is set on the battery cell 1100, the solar cell 1000 in this embodiment can be accurately overlapped with the main grid structure 1210 and the auxiliary grid structure 1220 by setting the orthographic projections of the first marking structure 1300 and the second marking structure 1400 on the battery cell 1100. Even if the main grid structure 1210 or the auxiliary grid structure 1220 in the area where the grid line assembly 1200 is set on the energy cell 1000 and the battery cell 1100 changes, the first marking structure 1300 and the second marking structure 1400 will not overlap with the main grid structure 1210 and the auxiliary grid structure 1220 in the area where the grid line assembly 1200 is set on the battery cell 1100, thereby facilitating the staff to use the first marking structure 1300 and the second marking structure 1400 in the same position to accurately overlap different main grid structures 1210 and auxiliary grid structures 1220 in the area where the grid line assembly 1200 is set on the battery cell 1100, avoiding re-setting the marking structure, and ultimately reducing the time, manpower and material resources required for manufacturing the solar cell 1000, thereby improving the manufacturing efficiency of the solar cell 1000.

[0046] Please refer to Figures 1 to 3. In some embodiments, the main gate structure 1210 includes a main gate 1211 extending along a first direction, and the secondary gate structure 1220 includes a fine gate 1221 and a frame grid line 1222. The fine gate 1221 extends along a second direction and intersects with the main gate 1211. The first direction and the second direction are perpendicular to the thickness direction of the battery cell 1100, and the first direction and the second direction intersect. The frame grid lines 1222 are connected end to end and form a grid line area (not shown). The main gate 1211 and the fine gate 1221 are arranged in the grid line area, and the first marking structure 1300 and the second marking structure 1400 are both arranged outside the grid line area.

[0047] In this embodiment, the main gate 1211 and the fine gate 1221 are arranged in the area surrounded by the frame grid line 1222, and the first marking structure 1300 and the second marking structure 1400 are arranged outside the area surrounded by the frame grid line 1222, so that the first marking structure 1300 and the second marking structure 1400 are separated from the main gate 1211 and the fine gate 1221. On the one hand, even if the main gate 1211 and the fine gate 1221 are changed, the first marking structure 1300 and the second marking structure 1400 will not be separated from the main gate 1211. 1 and the fine grid 1221 overlap, so that it is convenient for the staff to use the first marking structure 1300 and the second marking structure 1400 at the same position to accurately overlap different main grid structures 1210 and auxiliary grid structures 1220. On the other hand, the camera of the printing device (not shown) can quickly capture the first marking structure 1300 and the second marking structure 1400, so that the printing device can quickly print the main grid 1211 and the fine grid 1221 on the battery cell 1100, thereby improving the manufacturing efficiency of the solar cell 1000.

[0048] It should be further explained that the changes in the main gate 1211 and the fine gate 1221 refer to that when there are multiple main gates 1211 and fine gates 1221 in the gate line area, the number of the main gates 1211 and fine gates 1221 increases or decreases, or the distance between two adjacent main gates 1211 and fine gates 1221 increases or decreases.

[0049] Please refer to FIG. 1 . In some embodiments, the outer contour of the cell 1100 and the frame grid line 1222 enclose a ring-shaped area (not shown), and the first marking structure 1300 and the second marking structure 1400 are both disposed in the ring-shaped area.

[0050] In this embodiment, the outer contour of the cell 1100 and the frame grid line 1222 are arranged to form a ring area, so that there is a distance between the frame grid line 1222 and the outer contour of the cell 1100, thereby preventing the frame grid line 1222 from being printed on the outer contour of the cell 1100, thereby improving the yield rate of the solar cell 1000.

[0051] Please refer to Figure 1. In some embodiments, the first marking structure 1300 is a marking point (not shown), and the second marking structure 1400 is a marking ring (not shown). The orthographic projection of the marking ring on the battery cell 1100 is arranged around the outside of the orthographic projection of the marking point on the battery cell 1100, or the orthographic projection of the marking ring on the battery cell 1100 overlaps with part of the orthographic projection of the marking point on the battery cell 1100.

[0052] In this embodiment, by setting the first marking structure 1300 as a marking point and the second marking structure 1400 as a marking ring, the orthographic projection of the marking ring on the battery cell 1100 is arranged around the outside of the orthographic projection of the marking point on the battery cell 1100, or the orthographic projection of the marking ring on the battery cell 1100 overlaps with part of the orthographic projection of the marking point on the battery cell 1100, so that the printing device can quickly realize the precise positioning of the marking ring and the marking point, and then accurately overlap the main grid structure 1210 and the auxiliary grid structure 1220.

[0053] In some embodiments, the marking point may adopt common marking structures such as a cross marking point, a cross marking point, a marking circle, etc.

[0054] Please refer to Figure 1. In some embodiments, the outer contour of the battery cell 1100 is a rectangular frame (not shown), and chamfers 1110 are provided at the corners of the rectangular frame. The area enclosed by the border grid lines 1222 is a rectangle, and border chamfer grid lines 1223 corresponding to the chamfers 1110 are provided at the corners of the border grid lines 1222. The border chamfer grid lines 1223 are parallel to the corresponding chamfers 1110 and are arranged at intervals. The border chamfer grid lines 1223 are straight lines. In the direction away from the center of the battery cell 1100 along the first direction, the distance between the border chamfer grid lines 1223 and the center of the battery cell 1100 in the second direction gradually decreases, and the second marking structure 1400 is arranged between the chamfer 1110 and the corresponding border chamfer grid lines 1223.

[0055] In this embodiment, the outer contour of the battery cell 1100 is set to be a rectangular frame, chamfers 1110 are provided at the corners of the rectangular frame, the area enclosed by the frame grid lines 1222 is a rectangle, and frame chamfer grid lines 1223 corresponding to the chamfers 1110 are provided at the corners of the frame grid lines 1222. After printing by the printing device, frame grid lines 1222 and frame chamfer grid lines 1223 can be formed at the surrounding frame positions and chamfers 1110 positions of the rectangular frame of the battery cell 1100, thereby facilitating the collection and export of the current generated at the edge position of the solar cell 1000, and ultimately improving the photoelectric conversion efficiency of the solar cell 1000. By setting the frame chamfer grid lines 1223 to be parallel to the corresponding chamfers 1110 and to be spaced apart, the stress at the chamfers 1110 of the battery cell 1100 can be made more uniform.

[0056] In some embodiments, chamfers 1110 are provided at the four corners of the rectangular frame, the area enclosed by the border grid lines 1222 is a rectangle, and border chamfer lines 1223 are provided at the four corners of the border grid lines 1222. The four border chamfer lines 1223 are arranged in one-to-one correspondence with the four chamfers 1110, and each border chamfer line 1223 is parallel to the corresponding chamfer 1110 and is arranged at intervals.

[0057] In some embodiments, the solar cell 1000 includes four first marking structures 1300, which are arranged in a one-to-one correspondence with the four chamfers 1110, and a corresponding first marking structure 1300 is provided between each chamfer 1110 and the corresponding frame chamfer grid line 1223; four second marking structures 1400, which are arranged in correspondence with the four first marking structures 1300, and the orthographic projection of each second marking structure 1400 on the battery cell 1100 surrounds the outside of the orthographic projection of the corresponding first marking structure 1300 on the battery cell 1100, or overlaps with a part of the orthographic projection of the corresponding first marking structure 1300 on the battery cell 1100.

[0058] By providing a plurality of first marking structures 1300 and a plurality of second marking structures 1400 , the main gate structure 1210 and the auxiliary gate structure 1220 can be overlapped more accurately.

[0059] Please refer to FIG. 2 . In some embodiments, in the extension direction of the border chamfered line 1223 , the distances between the second marking structure 1400 and two ends of the border chamfered line 1223 are equal.

[0060] In this embodiment, by setting the distance between the second marking structure 1400 and the two ends of the border chamfer grid line 1223 to be equal, the distance between the second marking structure 1400 and the relative ends of the chamfer 1110 along the extension direction of the border chamfer grid line 1223 can be made equal, thereby achieving uniform stress distribution at the chamfer 1110 of the battery cell 1100.

[0061] In some embodiments, in the extension direction of the frame chamfer line 1223 , the distance between the second marking structure 1400 and both ends of the frame chamfer line 1223 is 2.685 mm, and the distance between the second marking structure 1400 and both ends of the chamfer 1110 is 2.975 mm.

[0062] Please continue to refer to FIG. 2 . In some embodiments, the distance between the second mark structure 1400 and the chamfer 1110 is equal to the distance between the second mark structure 1400 and the frame chamfer grid line 1223 .

[0063] In this embodiment, by setting the distance between the second marking structure 1400 and the chamfer 1110 to be equal to the distance between the second marking structure 1400 and the border chamfer grid line 1223, a gap can be provided between the chamfer 1110 and the border chamfer grid line 1223 and the second marking structure 1400, thereby preventing the second marking structure 1400 from contacting the border chamfer grid line 1223 and the chamfer 1110.

[0064] In some embodiments, the distance between the second marking structure 1400 and the chamfer 1110 is D1, and the size of D1 is 0.35 mm. The distance between the second marking structure 1400 and the frame chamfer grid line 1223 is D2, and the size of D2 is 0.35 mm.

[0065] Please refer to Figure 3. In some embodiments, the main gate structure 1210 includes a plurality of main gates 1211 arranged at intervals along the second direction, each main gate 1211 includes a fine main gate 1211-1 and a plurality of first pads 1211-2, the fine main gate 1211-1 extends along the first direction, and the plurality of first pads 1211-2 are arranged on the fine main gate 1211-1 at intervals along the first direction. The secondary gate structure 1220 includes fine gates 1221 arranged at intervals along the first direction, each fine gate 1221 extends along the second direction, and some of the fine gates 1221 are electrically connected to the first pads 1211-2.

[0066] In this embodiment, part of the fine grid 1221 is electrically connected to the main grid 1211 through the first pad 1211-2. In addition, it should be further explained that since the main grid 1211 and the fine grid 1221 are located within the area surrounded by the frame grid line 1222, and the first marking structure 1300 and the second marking structure 1400 are located outside the area surrounded by the frame grid line 1222, the number of the main grid 1211 and the fine grid 1221 in the area surrounded by the frame grid line 1222, and the number of the two adjacent main grids 1211 and the fine grid 1221 are greater than 1. The spacing between the first marking structure 1300 and the second marking structure 1400 is not limited by the size of the first marking structure 1300 and the size of the second marking structure 1400. The staff can set more main grids 1211 and fine grids 1221 at one time in the area enclosed by the frame grid lines 1222, and adjust the spacing between multiple adjacent main grids 1211 and fine grids 1221 at the same time as needed, thereby avoiding the staff from adjusting the positions of the first marking structure 1300 and the second marking structure 1400 when changing the main grid structure 1210 and the sub-grid structure 1220.

[0067] In some embodiments, each first pad 1211 - 2 is provided with overlapping portions 1211 - 5 for overlapping and connecting the fine grid 1221 on two opposite sides along the second direction, respectively, and the overlapping portions 1211 - 5 extend along the second direction.

[0068] In some embodiments, a plurality of bus bars 1211-6 spaced apart along a first direction are provided on the fine main grid 1211-1, and the fine grid 1221 is connected to the main grid 1211 via the bus bars 1211-6. The current generated by the battery cell 1100 collected by the fine grid 1221 is transmitted to the main grid 1211 via the bus bars 1211-6.

[0069] Please continue to refer to Figure 3. In some embodiments, the two ends of the fine main grid 1211-1 are provided with a second welding pad 1211-3 and a bus 1211-4 connected to the second welding pad 1211-3. The bus 1211-4 includes two forked lines 1211-4-1. One end of each forked line 1211-4-1 is connected to the corresponding second welding pad 1211-3, and the other end is connected to the frame grid line 1222. In the direction away from the center of the battery cell 1100 along the first direction, the distance between the two forked lines 1211-4-1 in each bus 1211-4 in the second direction gradually increases.

[0070] In this embodiment, the bus 1211-4 (harpoon structure) is connected to the second pad 1211-3 and the bus 1211-4 is set on the main grid 1211. This can reduce the amount of silver paste used in the fine grid 1221 and reduce the setting height of the bus 1211-4 in the grid line assembly 1200, thereby effectively reducing the cost of using silver paste.

[0071] Please refer to Figure 1, which shows a schematic diagram of the structure of a solar cell in an embodiment of the present application. A photovoltaic module (not shown) provided in an embodiment of the present application includes the aforementioned solar cell 1000, and multiple solar cells 1000 are connected in series and / or in parallel.

[0072] The photovoltaic assembly in this embodiment can accurately overlap the main grid structure 1210 and the auxiliary grid structure 1220 by ensuring the relative position relationship between the first marking structure 1300 and the second marking structure 1400. By setting the orthographic projections of the first marking structure 1300 and the second marking structure 1400 on the battery cell 1100 to be located outside the orthographic projection of the main grid structure 1210 on the battery cell 1100 and the orthographic projection of the auxiliary grid structure 1220 on the battery cell 1100, the first marking structure 1300 and the second marking structure 1400 can be located outside the area where the grid line assembly 1200 is set on the battery cell 1100. Compared with the first marking structure 1300 and the second marking structure 1400 being located within the area where the grid line assembly 1200 is set on the battery cell 1100, in this embodiment, For the solar cell 1000, even if the main grid structure 1210 or the auxiliary grid structure 1220 in the area where the grid line assembly 1200 is set on the cell 1100 changes, the first marking structure 1300 and the second marking structure 1400 will not overlap with the main grid structure 1210 and the auxiliary grid structure 1220 in the area where the grid line assembly 1200 is set on the cell 1100, thereby facilitating the staff to use the first marking structure 1300 and the second marking structure 1400 at the same position to accurately overlap different main grid structures 1210 and auxiliary grid structures 1220 in the area where the grid line assembly 1200 is set on the cell 1100, avoiding re-setting of the marking structure, and ultimately reducing the time, manpower and material resources required for manufacturing photovoltaic modules, thereby improving the manufacturing efficiency of photovoltaic modules.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A solar cell, characterized in that: The solar cell comprises: Battery cells; A grid line assembly is arranged on the battery cell, and the grid line assembly includes a main grid structure and a secondary grid structure stacked in a direction away from the battery cell: A first marking structure, provided on the battery cell, and used to mark the main grid structure; A second marking structure, provided on the battery cell, and used to mark the secondary grid structure; The orthographic projections of the first marking structure and the second marking structure on the battery cell are both located outside the orthographic projection of the main grid structure on the battery cell and outside the orthographic projection of the auxiliary grid structure on the battery cell.

2. The solar cell according to claim 1, characterized in that The main grid structure includes a main grid extending along a first direction; The auxiliary grid structure includes a fine grid and a frame grid line, the fine grid extends along a second direction and intersects with the main grid, the first direction and the second direction are perpendicular to the thickness direction of the battery cell, and the first direction and the second direction intersect; The frame grid lines are connected end to end and enclose a grid line area. The main grid and the fine grid are arranged in the grid line area. The first marking structure and the second marking structure are both arranged outside the grid line area.

3. The solar cell according to claim 2, characterized in that: The outer contour line of the battery cell and the frame grid line form a ring-shaped area, and the first marking structure and the second marking structure are both arranged in the ring-shaped area.

4. The solar cell according to claim 2, characterized in that: The first marking structure is a marking point, and the second marking structure is a marking ring; The orthographic projection of the marking ring on the battery cell is arranged around the outside of the orthographic projection of the marking point on the battery cell, or the orthographic projection of the marking ring on the battery cell overlaps with a part of the orthographic projection of the marking point on the battery cell.

5. The solar cell according to claim 4, characterized in that: The outer contour of the battery cell is a rectangular frame, and the corners of the rectangular frame are chamfered; The area enclosed by the frame grid lines is a rectangle, frame chamfer grid lines corresponding to the chamfers are arranged at the corners of the frame grid lines, the frame chamfer grid lines are parallel to the corresponding chamfers and are arranged at intervals, the frame chamfer grid lines are straight lines, and in the direction away from the center of the battery cell along the first direction, the spacing between the frame chamfer grid lines and the center of the battery cell in the second direction gradually decreases; The second marking structure is arranged between the chamfer and the corresponding frame chamfer grid line.

6. The solar cell according to claim 5, characterized in that: In the extension direction of the frame chamfered grid line, the distance between the second marking structure and two ends of the frame chamfered grid line is equal.

7. The solar cell according to claim 5, characterized in that: The distance between the second marking structure and the chamfer is equal to the distance between the second marking structure and the frame chamfer grid line.

8. The solar cell according to claim 2, characterized in that: The main grid structure includes a plurality of main grids arranged at intervals along the second direction, each of the main grids includes a thin main grid and a plurality of first pads, the thin main grids extend along the first direction, and the plurality of first pads are arranged at intervals on the thin main grids along the first direction; The auxiliary gate structure includes a plurality of the fine gates arranged at intervals along the first direction, each of the fine gates extends along the second direction, and some of the fine gates are electrically connected to the first pad.

9. The solar cell according to claim 8, characterized in that Two ends of the thin main grid are provided with second pads and a busbar connected to the second pads; The busbar includes two forked lines, one end of each of the forked lines is connected to the corresponding second solder pad, and the other end is connected to the frame grid line. In the direction away from the center of the battery cell along the first direction, the distance between the two forked lines in each of the busbars in the second direction gradually increases.

10. A photovoltaic module, comprising the solar cell according to any one of claims 1 to 9, characterized in that: The plurality of solar cells are connected in series and / or in parallel.

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