Solar cell, screen, and assembly

Abstract

Disclosed are a solar cell, a screen, and an assembly. The solar cell comprises four first primary fiducial marks, the four first primary fiducial marks being asymmetrically distributed along a cutting line of a solar cell. The solar cell provided in the present disclosure allows for a placement direction of a silicon wafer to be accurately determined while achieving precise grid line printing on the silicon wafer.

Description

Battery piece and screen, assembly

[0001] The present disclosure claims priority to the Chinese patent application No. 202422175608X, filed on September 4, 2024, and entitled "Solar cell piece and printing screen, photovoltaic assembly", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of solar cell, in particular to a solar cell piece, a printing screen and a photovoltaic assembly. BACKGROUND

[0003] In the preparation process of a solar cell, a Mark point is generally arranged outside the laser grooving area of a silicon wafer. When printing a grid line, the Mark point is captured by a camera to realize the alignment printing of the grid line and the laser grooving area. Generally, the Mark point is arranged at the four corners of the silicon wafer and symmetrically distributed in the horizontal and vertical directions of the silicon wafer. If the silicon wafer is placed with a rotation of 180° during the grid line printing process, the placement direction of the silicon wafer cannot be accurately identified through the symmetrically distributed Mark points, thereby causing the grid line position of the screen printing screen to deviate from the printing position of the grid line on the silicon wafer. Especially in the process of printing the grid line on the back of an IBC solar cell, the reverse placement of the silicon wafer may even cause the grid line printing dislocation of the N region and the P region, which seriously affects the performance and quality of the solar cell piece.

[0004] DISCLOSURE

[0005] The technical problem to be solved by the present disclosure is to provide a solar cell piece, which can accurately print a grid line on a silicon wafer and accurately determine the placement direction of the silicon wafer, thereby avoiding the influence of the reverse placement of the silicon wafer on the printing quality of the grid.

[0006] The technical problem to be solved by the present disclosure is also to provide a printing screen for screen printing the above-mentioned solar cell piece, so that the grid line of the printed solar cell piece is accurately positioned.

[0007] In order to solve the above technical problems, the present disclosure provides a solar cell piece, which comprises a silicon wafer, a grid line structure arranged on the front surface of the silicon wafer and / or the back surface of the silicon wafer, and a positioning structure. The positioning structure comprises a first main Mark point. The number of the first main Mark points on the front surface and / or the back surface of the silicon wafer is four, and the four first main Mark points are asymmetrically distributed about the cutting line of the solar cell piece.

[0008] As an improvement of the above-mentioned scheme, the four first main Mark points are distributed in a quadrilateral shape, and the length of at least one pair of opposite sides of the quadrilateral is different.

[0009] As an improvement of the above-mentioned solution, the four first main Mark points are in a trapezoidal distribution.

[0010] As an improvement of the above-mentioned solution, the four first main Mark points are in an isosceles trapezoidal distribution.

[0011] As an improvement of the above-mentioned solution, one or more of the first main Mark points are arranged at the edge of the gate line structure.

[0012] As an improvement of the above-mentioned solution, the gate line structure comprises fine gate lines arranged alternately and in opposite polarity, and one or more of the first main Mark points are arranged on the fine gate lines, and the paste for forming the first main Mark points arranged on the fine gate lines is in contact with the doped layer of the solar cell piece.

[0013] As an improvement of the above-mentioned solution, the first main Mark point comprises a hollow part, and the fine gate line is in contact with the edge of the first main Mark point and is disconnected at the hollow part.

[0014] As an improvement of the above-mentioned solution, the first main Mark point comprises a hollow part, and the fine gate line covers part of the hollow part.

[0015] As an improvement of the above-mentioned solution, the first main Mark point and the fine gate line where the first main Mark point is arranged are free of gaps in the vertical direction.

[0016] As an improvement of the above-mentioned solution, the gate line structure comprises fine gate lines arranged alternately and in opposite polarity, and main gate lines arranged alternately and in opposite polarity, the extension direction of the fine gate lines intersects the extension direction of the main gate lines, and one or more of the first main Mark points are arranged on the main gate lines, and the paste for forming the first main Mark points arranged on the main gate lines is not in contact with the doped layer of the solar cell piece.

[0017] As an improvement of the above-mentioned solution, the first main Mark point comprises a hollow part, and the main gate line is in contact with the edge of the first main Mark point and is disconnected at the hollow part.

[0018] As an improvement of the above-mentioned solution, the first main Mark point comprises a hollow part, and part of the main gate line covers the hollow part.

[0019] As an improvement of the above-mentioned solution, the first main Mark point comprises a hollow part, and the main gate line completely covers the hollow part.

[0020] As an improvement of the above-mentioned solution, the main gate line comprises a first main gate line part and a second main gate line part, the width of the second main gate line part is smaller than that of the first main gate line part, and the first main Mark point is arranged on the second main gate line part.

[0021] As an improvement of the above-mentioned solution, the grid line structure comprises fine grid lines and main grid lines, the fine grid lines and the main grid lines are arranged alternately and oppositely in polarity, the extending direction of the fine grid lines intersects with the extending direction of the main fine grid lines, and an interval area is arranged between the main grid lines and the fine grid lines with opposite polarity, and one or more first main Mark points are arranged in the interval area.

[0022] As an improvement of the above-mentioned solution, the four first main Mark points are arranged on a first horizontal line and a second horizontal line respectively, the distance between the centers of the two first main Mark points arranged on the first horizontal line is 50mm-200mm, the distance between the centers of the two first main Mark points arranged on the second horizontal line is 80mm-200mm, and the distance between the first horizontal line and the second horizontal line is 150mm-200mm.

[0023] As an improvement of the above-mentioned solution, the alignment structure further comprises at least one first secondary Mark point, and the first secondary Mark point and the first main Mark point are arranged on different horizontal lines and / or vertical lines.

[0024] As an improvement of the above-mentioned solution, the distance between the first secondary Mark point and the center of the solar cell is less than the distance between the first main Mark point and the center of the solar cell.

[0025] As an improvement of the above-mentioned solution, the grid line structure comprises fine grid lines, and one or more first secondary Mark points are arranged on the fine grid lines.

[0026] As an improvement of the above-mentioned solution, the grid line structure comprises fine grid lines, and one or more first secondary Mark points are arranged between the fine grid lines.

[0027] As an improvement of the above-mentioned solution, the distance between the first secondary Mark point and the center of the solar cell is greater than the distance between the first main Mark point and the center of the solar cell.

[0028] As an improvement of the above-mentioned solution, the distance between the center of one of the first main Mark points and the center of the first secondary Mark point in the vertical direction is 5mm-50mm, and the distance in the horizontal direction is 5mm-50mm.

[0029] As an improvement of the above-mentioned solution, the shape of each of the first main Mark points and the first secondary Mark points is one or more of a circle, a cross, a rectangle, a trapezoid, and a pentagon.

[0030] As an improvement of the above scheme, each of the first main Mark points has a length of 5mm-10mm and a width of 5mm-10mm; and each of the first auxiliary Mark points has a length of 1mm-5mm and a width of 1mm-5mm.

[0031] Correspondingly, the present disclosure also provides a printing screen plate for screen printing the above-mentioned solar cell piece, wherein the printing screen plate is provided with second main Mark points, and each of the second main Mark points corresponds to one of the first main Mark points.

[0032] As an improvement of the above scheme, the printing screen plate is provided with second auxiliary Mark points, and each of the second auxiliary Mark points corresponds to one of the first auxiliary Mark points.

[0033] Correspondingly, the present disclosure also provides a photovoltaic module comprising the above-mentioned solar cell piece.

[0034] The present disclosure has the following beneficial effects: by setting four first main Mark points on the silicon piece, which are asymmetrically distributed with respect to the cutting line of the cell piece, not only can the printing position of the grid line be quickly positioned, but also the placement direction of the silicon piece can be accurately judged, thereby avoiding the problem of grid line printing quality caused by the reverse placement of the silicon piece. BRIEF DESCRIPTION OF DRAWINGS

[0035] Fig. 1 is a structural schematic diagram of a solar cell piece provided by an embodiment of the present disclosure;

[0036] Fig. 2 is a position schematic diagram of a first main Mark point provided by an embodiment of the present disclosure;

[0037] Fig. 3 is a position schematic diagram of a first main Mark point provided by an embodiment of the present disclosure;

[0038] Fig. 4 is a position schematic diagram of a first main Mark point and a fine grid line provided by an embodiment of the present disclosure;

[0039] Fig. 5 is a position schematic diagram of a first main Mark point and a fine grid line provided by an embodiment of the present disclosure;

[0040] Fig. 6 is a position schematic diagram of a first main Mark point and a fine grid line provided by an embodiment of the present disclosure;

[0041] Fig. 7 is a position schematic diagram of a first main Mark point provided by an embodiment of the present disclosure;

[0042] Fig. 8 is a position schematic diagram of a first main Mark point provided by an embodiment of the present disclosure;

[0043] Fig. 9 is a structural schematic diagram of a solar cell piece provided by an embodiment of the present disclosure;

[0044] FIG. 10 is a structural schematic diagram of a printing screen provided by an embodiment of the present disclosure;

[0045] FIG. 11 is a structural schematic diagram of a printing screen provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] For the purpose, technical solutions and advantages of the present disclosure to be clearer, the present disclosure will be described in further detail below with reference to the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer orientation words appearing or about to appear in the present disclosure in the text are only based on the drawings of the present disclosure, and are not specific limitations on the present disclosure.

[0047] As shown in FIG. 1, an embodiment of the present disclosure provides a solar cell, which comprises a silicon wafer 11 and a positioning structure arranged on the front and / or back surface of the silicon wafer 11, the positioning structure comprising a first main Mark point 12, which is used to identify the printing position of the material (e.g., insulating layer, grid line, etc.) on the silicon wafer and to move the silicon wafer or screen to adjust the printing position. On the front and / or back surface of the silicon wafer, the number of the first main Mark points 12 is four, and the four first main Mark points 12 are distributed in a quadrilateral, i.e., the connecting line of the centers of the four first main Mark points 12 is a quadrilateral, and the four first main Mark points 12 are asymmetrically distributed about the cutting line of the solar cell. It can be understood that the cutting line of the solar cell is generally a center line parallel to the edge of the solar cell, two of the four first main Mark points 12 are arranged on one side of the cutting line, and the other two are arranged on the other side of the cutting line, and the quadrilateral formed by the four first main Mark points 12 cannot coincide with the original quadrilateral after being rotated by 180°. Therefore, if the first main Mark point cannot be captured at the position where it should be captured, it can be judged that the placement direction of the silicon wafer is opposite to the preset placement direction, so as to timely adjust the placement direction of the silicon wafer. Since the electrode position and shape of the solar cell need to be designed according to the performance requirements of the product, if the silicon wafer is placed with a rotation of 180° during the printing of the electrode, the printing position of the material on the silicon wafer may be offset from the position of the printing screen, causing the series resistance to be too large, resulting in a decrease in the efficiency of the solar cell, and even causing the current to be unable to be led out, which seriously affects the performance and quality of the solar cell. By arranging the four first main Mark points, the placement direction of the silicon wafer can be accurately judged while achieving fast positioning, and the positioning is accurate and efficient.

[0048] As a case, the four first main Mark points are distributed in a quadrilateral, and the quadrilateral has at least one pair of sides with different lengths, thereby forming a positioning structure for determining the placement direction of the silicon wafer. In an alternative embodiment, the four first main Mark points 12 are distributed in a trapezoid, i.e., the line connecting the centers of the four first main Mark points 12 is a trapezoid. In this case, the four first main Mark points 12 can be distributed in a right trapezoid, and the right angle side of the right trapezoid is parallel to the edge of the silicon wafer. The right trapezoid distribution can simplify the calculation of the printing position offset and ensure the positioning accuracy of the electrode printing. Alternatively, the four first main Mark points 12 are distributed in an isosceles trapezoid, i.e., the line connecting the centers of the four first main Mark points 12 is an isosceles trapezoid, and the base of the isosceles trapezoid is parallel to the edge of the silicon wafer, which further ensures the positioning accuracy of the electrode printing.

[0049] It can be understood that the front surface and / or the back surface of the silicon wafer is provided with a grid line structure 13, and the first main Mark point 12 can be arranged on the edge of the grid line structure 13 or inside the grid line structure 13 (which can also be understood as between the grid line structures 13 of the solar cell wafer or on the grid line structures 13 of the solar cell wafer), and the grid line structure 13 includes fine grid lines 131 arranged alternately and having opposite polarities.

[0050] As shown in FIG. 2, in an embodiment, in order to reduce the influence of the arrangement of the first main Mark point 12 on the solar cell wafer, one or more of the four first main Mark points 12 can be arranged on the edge of the grid line structure 13, so as to realize the printing positioning while reducing the performance decline of the silicon wafer caused by light blocking.

[0051] In an embodiment, as shown in FIG. 3, one or more of the first main Mark points 12 are arranged on the fine grid line 131. Specifically, as shown in FIG. 4, the first main Mark point 12 includes a hollow part 121, the fine grid line 131 is in contact with the edge of the first main Mark point 12 and is disconnected at the hollow part 121. Since the Mark point is printed on the doped area of the silicon wafer by paste, the design of the hollow part 121 can save the paste required for printing the first main Mark point 12, and the design of the hollow part 121 is also conducive to better identifying and grabbing the first main Mark point 12. As shown in FIG. 5, the fine grid line 131 can partially cover the hollow part 121. As shown in FIG. 6, there is no gap between the fine grid line 131 and the first main Mark point in the vertical direction. Unlike FIG. 6, FIG. 5 shows the case where there is a gap between the fine grid line 131 and the first main Mark point in the vertical direction. The printing of the paste in the manner of FIG. 5 or FIG. 6 can have more contact with the doped area of the cell wafer, and the collection effect of the carriers is better.

[0052] In an embodiment, one or more of the first main Mark points 12 are arranged on the main grid lines 132. Optionally, the first main Mark points 12 comprise a hollow part 121, the main grid lines 132 are in contact with the edges of the first main Mark points 12 and are broken at the hollow part 121. The design of the hollow part can save the paste required for printing the first main Mark points, and the design of the hollow part is also conducive to better grabbing the first main Mark points. Optionally, the main grid lines 132 can partially cover the hollow part 121, and the main grid lines 132 can also completely cover the hollow part 121. The printed paste can have more contact with the doped area of the solar cell sheet, and the collection of carriers is better.

[0053] In an optional embodiment, as shown in FIG. 7, the main grid lines 132 comprise a first main grid line part 133 and a second main grid line part 134, the width of the second main grid line part 134 is smaller than that of the first main grid line part 133, and the first main Mark points 12 are arranged on the second main grid line part 134. Since the width of the main grid line is larger than that of the fine grid line, if the first main Mark points arranged on the main grid line are to be accurately grabbed, the size of the first main Mark points needs to be larger, which causes a significant increase in the amount of printed paste. Therefore, by arranging the first main grid line part 133 and the second main grid line part 134 with different widths and arranging the first main Mark points 12 on the second main grid line part 134 with a smaller width, the first main Mark points 12 can be better grabbed while saving paste.

[0054] In an embodiment, as shown in FIG. 8, the grid line structure 13 comprises fine grid lines 131 arranged alternately and spaced apart and having opposite polarities, and main grid lines 132 arranged alternately and spaced apart and having opposite polarities and intersecting the fine grid lines 131, and the main grid lines 132 and the fine grid lines 131 having opposite polarities are provided with an interruption area 135, and one or more of the first main Mark points 12 are arranged on the interruption area 135. Since the main grid lines and the fine grid lines of the interruption area do not intersect, the first main Mark points are arranged in this area, which does not affect the collection of carriers, thereby avoiding the adverse effects of the arrangement of the first main Mark points 12 on the performance of the solar cell. In addition, when the first main Mark points 12 are arranged at the edge of the solar cell sheet, there are more cases of poor printing in actual production. Therefore, by arranging the first main Mark points 12 on the interruption area 135, the edge grabbing failure caused by poor printing can be reduced.

[0055] Exemplarily, as shown in FIG. 1, four first main Mark points 12 are arranged on the first horizontal line and the second horizontal line respectively. The distance D1 between the centers of the two first main Mark points arranged on the first horizontal line is 50mm-200mm, and is exemplarily 60mm, 80mm, 120mm, 150mm or 180mm, but is not limited thereto. The distance D2 between the centers of the two first main Mark points arranged on the second horizontal line is 80mm-200mm, and is exemplarily 90mm, 100mm, 120mm, 150mm or 180mm, but is not limited thereto. The distance D3 between the first horizontal line and the second horizontal line is 150mm-200mm, and is exemplarily 155mm, 160mm, 170mm, 180mm or 190mm, but is not limited thereto.

[0056] Optionally, as shown in FIG. 9, the alignment structure further comprises at least one first auxiliary Mark point 15, which is arranged on a different horizontal line and / or vertical line from the first main Mark point 12. The first auxiliary Mark point is arranged to further improve the positioning accuracy of the grid line printing.

[0057] It can be understood that the first auxiliary Mark point 15 can be arranged on the edge of the grid line structure 13 or inside the grid line structure 13.

[0058] In an embodiment, the first auxiliary Mark point 15 is arranged on the side of the first main Mark point 12 close to the grid line structure 13. Specifically, the first auxiliary Mark point can be arranged on the fine grid line 131 or between the fine grid lines 131.

[0059] In an embodiment, the first auxiliary Mark point 15 is arranged on the side of the first main Mark point 12 away from the grid line structure 13.

[0060] The distance D4 between the center of one of the first main Mark points 12 and the center of the first auxiliary Mark point 15 in the vertical direction is 5mm-50mm, and is exemplarily 8mm, 10mm, 15mm, 20mm, 30mm or 40mm, but is not limited thereto. The distance D5 between the center of one of the first main Mark points 12 and the center of the first auxiliary Mark point 15 in the horizontal direction is 5mm-50mm, and is exemplarily 8mm, 10mm, 15mm, 20mm, 30mm or 40mm, but is not limited thereto. If the distance between the first main Mark point and the first auxiliary Mark point is too small, it will interfere with the identification. If the distance between the first main Mark point and the first auxiliary Mark point is too large, it will exceed the range of one-time identification, increase the identification process, and is not conducive to rapid alignment.

[0061] Optionally, the first secondary Mark points 15 are asymmetrically arranged along the cutting line of the solar cell sheet. For example, the number of the first secondary Mark points 15 is four, two of which are arranged on one side of the cutting line and the other two are arranged on the other side of the cutting line. In this case, the situation that the placement direction of the silicon wafer is opposite to the preset direction can be quickly detected, thereby further improving the printing quality.

[0062] Of course, the first secondary Mark points 15 can also be symmetrically arranged along the cutting line of the solar cell sheet, which is not limited.

[0063] Specifically, the shape of each first primary Mark point 12 and first secondary Mark point 15 is one or more of a circle, a cross, a rectangle, a trapezoid, and a pentagon. For example, the length of each first primary Mark point is 5mm-10mm and the width is 5mm-10mm; the length of each first secondary Mark point is 1mm-5mm and the width is 1mm-5mm. The shape and size of the first primary Mark point and the first secondary Mark point can be selected according to actual production needs. If the first primary Mark point and the first secondary Mark point are too small, the accuracy of recognition is low; if the first primary Mark point and the first secondary Mark point are too large, it will cause shading, which will adversely affect the efficiency of the solar cell sheet.

[0064] As shown in FIG. 10, the present disclosure also provides a printing screen plate for screen printing the above-mentioned solar cell sheet, wherein the printing screen plate is provided with second primary Mark points 21, which one-to-one correspond to the first primary Mark points 12 in terms of number and position.

[0065] Optionally, as shown in FIG. 11, the printing screen plate is provided with second secondary Mark points 22, which one-to-one correspond to the first secondary Mark points 15.

[0066] Specifically, the shape of each second primary Mark point 21 and second secondary Mark point 22 is one or more of a circle, a cross, a rectangle, a trapezoid, and a pentagon. The length of each second primary Mark point 21 is 5mm-10mm and the width is 5mm-10mm; the length of each second secondary Mark point 22 is 1mm-5mm and the width is 1mm-5mm. The shape and size of the second primary Mark point and the second secondary Mark point can be selected according to actual production needs.

[0067] In addition, correspondingly, the present disclosure also provides a photovoltaic module comprising the above-mentioned solar cell sheet.

[0068] The above describes the preferred embodiments of the present disclosure, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present disclosure, and these improvements and refinements are also considered within the protection scope of the present disclosure.

Claims

1. A solar cell, comprising a silicon wafer, a grid line structure and a locating structure provided on a front surface of the silicon wafer and / or a back surface of the silicon wafer, the locating structure comprising first main Mark points, the number of the first main Mark points being four on the front surface of the silicon wafer and / or the back surface of the silicon wafer, and the four first main Mark points being asymmetrically distributed with respect to a cutting line of the solar cell.

2. The solar cell as claimed in claim 1, wherein, The four first main Mark points are distributed in a quadrilateral shape, and at least one pair of opposite sides of the quadrilateral has different lengths.

3. The solar cell as claimed in claim 2, wherein, The four first main Mark points are distributed in a trapezoidal shape.

4. The solar cell as claimed in claim 3, wherein, The four first main Mark points are distributed in an isosceles trapezoidal shape.

5. The solar cell as claimed in claim 1, wherein, One or more of the first main Mark points are provided at an edge of the grid line structure.

6. The solar cell of claim 1, wherein, The grid line structure comprises fine grid lines alternately and oppositely arranged, and one or more of the first main Mark points are provided on the fine grid lines, and a paste used to form the first main Mark points provided on the fine grid lines is in contact with a doped layer of the solar cell.

7. The solar cell as claimed in claim 6, wherein, The first main Mark point comprises a hollow part, and the fine grid line is in contact with an edge of the first main Mark point and is disconnected at the hollow part.

8. The solar cell of claim 6, wherein, The first main Mark point comprises a hollow part, and the fine grid line covers part of the hollow part.

9. The solar cell as claimed in claim 6, wherein, The first main Mark point and the fine grid line on which the first main Mark point is located do not have a gap in a vertical direction.

10. The solar cell of claim 1, wherein, The grid line structure comprises fine grid lines alternately and oppositely arranged, and main grid lines alternately and oppositely arranged, the extension direction of the fine grid lines intersects the extension direction of the main grid lines, and one or more of the first main Mark points are provided on the main grid lines, and a paste used to form the first main Mark points provided on the main grid lines is not in contact with a doped layer of the solar cell.

11. The solar cell as claimed in claim 10, wherein, The first main Mark point comprises a hollow part, and the main grid line is in contact with an edge of the first main Mark point and is disconnected at the hollow part.

12. The solar cell of claim 10, wherein, The first main Mark point comprises a hollow part, and part of the main grid line covers the hollow part.

13. The solar cell of claim 10, wherein, The first main Mark point comprises a hollow part, and the main grid line completely covers the hollow part.

14. The solar cell of claim 10, wherein, The main grid line comprises a first main grid line part and a second main grid line part, the width of the second main grid line part is smaller than that of the first main grid line part, and the first main Mark point is provided on the second main grid line part.

15. The solar cell of claim 1, wherein, The grid line structure comprises fine grid lines alternately and oppositely arranged, and main grid lines alternately and oppositely arranged, the extension direction of the fine grid lines intersects the extension direction of the main grid lines, and an interruption area is provided between the main grid line and the fine grid line with opposite polarity, and one or more of the first main Mark points are provided in the interruption area.

16. The solar cell of claim 1, wherein, Four first main Mark points are arranged on the first horizontal line and the second horizontal line, respectively, the distance between the centers of two first main Mark points arranged on the first horizontal line is 50mm-200mm, the distance between the centers of two first main Mark points arranged on the second horizontal line is 80mm-200mm, and the distance between the first horizontal line and the second horizontal line is 150mm-200mm.

17. The solar cell of claim 1, wherein, The alignment structure further comprises at least one first secondary Mark point, which is arranged on a different horizontal line and / or vertical line from the first main Mark point.

18. The solar cell of claim 17, wherein, The distance between the first secondary Mark point and the center of the solar cell is less than the distance between the first main Mark point and the center of the solar cell.

19. The solar cell of claim 18, wherein, The grid line structure comprises fine grid lines arranged alternately and spaced apart and having opposite polarities, and one or more first secondary Mark points are arranged on the fine grid lines.

20. The solar cell of claim 18, wherein, The grid line structure comprises fine grid lines arranged alternately and spaced apart and having opposite polarities, and one or more first secondary Mark points are arranged between two fine grid lines.

21. The solar cell of claim 17, wherein, The distance between the first secondary Mark point and the center of the solar cell is greater than the distance between the first main Mark point and the center of the solar cell.

22. The solar cell of claim 17, wherein the distance between the center of one first main Mark point and the center of the first secondary Mark point in the vertical direction is 5mm-50mm, and the distance in the horizontal direction is 5mm-50mm.

23. The solar cell of claim 17, wherein, Each of the first main Mark points and each of the first secondary Mark points has a shape selected from one or more of a circle, a cross, a rectangle, a trapezoid, and a pentagon.

24. The solar cell of claim 17, wherein, Each of the first main Mark points has a length of 5mm-10mm and a width of 5mm-10mm, and each of the first secondary Mark points has a length of 1mm-5mm and a width of 1mm-5mm.

25. A printing screen for screen printing a solar cell as claimed in any one of claims 1 to 24, wherein The printing screen plate is provided with second main Mark points, and each of the second main Mark points corresponds to one of the first main Mark points.

26. The printing screen according to claim 25, wherein The printing screen plate is provided with second secondary Mark points, and each of the second secondary Mark points corresponds to one of the first secondary Mark points.

27. A photovoltaic module, wherein, The solar cell comprises the solar cell of any one of claims 1-24.

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