Grid line arrangement structure, screen plate and photovoltaic cell

Abstract

The utility model discloses a grid line arrangement structure, a screen plate and a photovoltaic cell, which belong to the technical field of photovoltaic cells, the grid line arrangement structure comprises a plurality of transverse grid lines arranged in parallel, first grid lines and second grid lines are arranged on both sides of the arrangement direction of the transverse grid lines, and both the first grid lines and the second grid lines are perpendicular to the transverse grid lines; anti-breaking grid lines are connected between the transverse grid lines which are not in contact with the first grid lines and the second grid lines, each anti-breaking grid line is connected with two adjacent transverse grid lines, the anti-breaking grid lines are arranged at intervals, and the anti-breaking grid lines coincide with the welding strip in position. The positions of the anti-breaking grid lines coincide with the positions of the welding strips, so that the shading area is effectively reduced, the current collection capability is improved, and the photoelectric conversion efficiency of the solar cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, and specifically, to a grid line arrangement structure, a stencil and a photovoltaic cell. Background Art

[0002] Grid lines are one of the important factors affecting the photoelectric conversion efficiency and the component life of solar cells. The grid line design on the surface of a solar cell is to collect photocurrent to the main grid to the maximum extent. If there is a break in the metal fine grid line during the electrode printing process, it is equivalent to a circuit break, which will cause an increase in the series resistance of the cell and a decrease in the short-circuit current, thus affecting the photoelectric conversion efficiency of the cell. The absence of metal fine grid lines will also lead to the generation of defective EL breakage products, affecting the yield rate of enterprise production.

[0003] In the prior art, in order to reduce costs, a photovoltaic cell with a short main grid is designed. For example, the Chinese patent document with the publication number CN221150033U discloses a photovoltaic cell sheet and a photovoltaic module, which includes a front side of the cell sheet and a back side of the cell sheet arranged oppositely. Both the front side and the back side of the cell sheet are provided with fine grid lines evenly spaced and parallelly distributed. On the front side of the cell sheet, short main grids perpendicular to a plurality of fine grid lines are spaced at opposite ends in the arrangement direction of the fine grid lines. Anti-break grid lines are provided at positions on the fine grid lines where each solder strip is connected. A plurality of columns of glue-dot positioning points are provided between the short main grids at both ends of the front side of the cell sheet, and each column of glue-dot positioning points is correspondingly arranged with a solder strip.

[0004] However, the anti-break grid lines coincide with the fine grid lines. After the solder strip is welded through the glue-dot positioning points, it is perpendicular to the anti-break grid lines. The positions of the anti-break grid lines and the solder strips will cause an increase in the light-shielding area and reduce the photoelectric conversion rate of the photovoltaic cell. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a grid line arrangement structure, a stencil and a photovoltaic cell, so as to solve the problem in the prior art that after the solder strip is welded through the glue-dot positioning points, it is perpendicular to the anti-break grid lines, and the positions of the anti-break grid lines and the solder strips will cause an increase in the light-shielding area and reduce the photoelectric conversion rate of the photovoltaic cell.

[0006] To achieve the above purpose, the utility model provides a grid line arrangement structure, which includes a plurality of horizontally arranged grid lines arranged in parallel. On both sides of the arrangement direction of the horizontal grid lines, a first grid line and a second grid line are provided. Both the first grid line and the second grid line are perpendicular to the horizontal grid lines. Anti-break grid lines are connected between the horizontal grid lines that are not in contact with the first grid line and the second grid line. The anti-break grid lines connect two adjacent horizontal grid lines. The anti-break grid lines are spaced from each other, and the anti-break grid lines coincide with the positions of the solder strips.

[0007] Further, the length of the first grid line is greater than the length of the second grid line.

[0008] Further, the first gate lines and the second gate lines are arranged at intervals and alternately in the first half of the length direction of the horizontal gate lines, and the arrangement of the first gate lines and the second gate lines in the second half of the length direction of the horizontal gate lines is symmetrical to the arrangement of the first half.

[0009] Further, the position of the anti-breaking gate line is on the same straight line as the position of the first gate line.

[0010] Further, the first gate lines and the second gate lines located on both sides of the arrangement direction of the horizontal gate lines are symmetrically arranged with respect to the midline of the arrangement.

[0011] Further, the horizontal gate lines are uniformly arranged and the spacing is 1 mm to 1.5 mm.

[0012] Further, the length of the first gate line is 6 mm to 6.5 mm, and the length of the second gate line is 4 mm to 4.5 mm.

[0013] The present utility model also provides a stencil, including the above-mentioned gate line arrangement structure.

[0014] The present utility model also provides a photovoltaic cell, including a cell and the above-mentioned stencil.

[0015] Further, the cell is a main-gridless two-piece structure, and the stencil is arranged on each of the pieces, and the two stencils are symmetrically arranged.

[0016] Adopting the technical solution provided by the present utility model, compared with the existing well-known technologies, the following beneficial effects are achieved:

[0017] In a gate line arrangement structure of the present utility model, the anti-breaking gate line can replace the main gate and play the role of collecting current, and the anti-breaking gate lines are arranged at intervals with each other, and compared with the traditional main gate structure, silver paste can be saved. The anti-breaking gate line connects two adjacent horizontal gate lines, which can reduce the negative impact caused by broken gates, form more photocurrent paths, thereby reducing the series resistance of the solar cell and increasing the short-circuit current. The position of the anti-breaking gate line coincides with the position of the solder strip, effectively reducing the shading area and improving the current collection ability, thereby improving the photoelectric conversion efficiency of the solar cell.

[0018] Obviously, the elements or features described in the above single embodiment can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, the dimensions and ratios do not represent the dimensions and ratios of the actual products. The drawings are merely illustrative, and for the sake of clarity, some non-essential elements or features are omitted.

[0020] Figure 1It is a schematic three-dimensional structure diagram of a photovoltaic cell in an embodiment of the present utility model;

[0021] Figure 2 It is a schematic diagram of the grid line arrangement structure in an embodiment of the present utility model;

[0022] Figure 3 It is Figure 2 an enlarged view of part A in

[0023] Description of the reference numerals

[0024] 100, horizontal grid line; 200, anti-break grid line; 300, first grid line; 400, second grid line. Specific embodiments

[0025] Next, the present utility model will be described in detail with reference to the drawings. What is described here is only the preferred embodiment of the present utility model. Those skilled in the art can think of other ways to implement the present utility model based on the preferred embodiment, and these other ways also fall within the scope of the present utility model.

[0026] Embodiment 1

[0027] Please refer to Figures 1 - 3 , this embodiment provides a grid line arrangement structure, including a plurality of horizontally arranged grid lines 100 arranged in parallel. First grid lines 300 and second grid lines 400 are arranged on both sides of the arrangement direction of the horizontal grid lines 100. The first grid lines 300 and the second grid lines 400 are both perpendicular to the horizontal grid lines 100. Anti-break grid lines 200 are connected between the horizontal grid lines 100 that are not in contact with the first grid lines 300 and the second grid lines 400. The anti-break grid lines 200 can replace the traditional main grid and play the role of collecting current. The anti-break grid lines 200 are connected to adjacent two horizontal grid lines 100, which can reduce the negative impact caused by broken grids, form more photocurrent paths, thereby reducing the series resistance of the solar cell and increasing the short-circuit current. The anti-break grid lines 200 are connected to two adjacent horizontal grid lines 100, and the anti-break grid lines 200 are spaced apart from each other, which can save silver paste compared with the traditional main grid structure. The anti-break grid lines 200 coincide with the position of the solder tape, effectively reducing the shading area and improving the current collection ability, thereby improving the photoelectric conversion efficiency of the solar cell.

[0028] Furthermore, the length of the first grid lines 300 is greater than the length of the second grid lines 400, which can reduce the use of silver paste at the battery end while ensuring the welding effect. Specifically, as Figure 3As shown, the length of the first grid line 300 is 6 mm to 6.5 mm, and the length of the second grid line 400 is 4 mm to 4.5 mm. The lengths of both include the end values. Preferably, the length of the first grid line 300 is 6.36 mm, and the first grid line 300 is connected to 7 horizontal grid lines 100; the length of the second grid line 400 is 4.24 mm, and the second grid line 400 is connected to 5 horizontal grid lines 100. The first grid line 300 and the second grid line 400 are evenly distributed on both sides of the head and tail of the half-cell, and a total of 20 columns are provided, with a column pitch of 8.68 mm.

[0029] In some embodiments of the present application, the first grid line 300 and the second grid line 400 are arranged at intervals and alternately in the first half of the length direction of the horizontal grid line 100, and the arrangement of the first grid line 300 and the second grid line 400 in the second half of the length direction of the horizontal grid line 100 is symmetrical to the arrangement of the first half. It can be understood that, as Figure 2 shown, the arrangement of the first half and the second half here refers to the arrangement of the first grid line 300 and the second grid line 400 on both sides of the horizontal grid line 100.

[0030] Furthermore, the first grid line 300 and the second grid line 400 located on both sides of the arrangement direction of the horizontal grid line 100 are symmetrically arranged about the midline of the arrangement. It should be noted that, as Figure 2 shown, this arrangement refers to the arrangement direction of the horizontal grid line 100 from top to bottom, that is, the first grid line 300 and the second grid line 400 on the upper and lower sides are symmetric about the midline. The horizontal grid lines 100 are evenly arranged with a pitch of 1 mm to 1.5 mm. Specifically, the pitch between the horizontal grid lines 100 is 1.06 mm, and the number of half-cell grid lines is 90.

[0031] In some embodiments of the present application, the position of the anti-breaking grid line 200 is on the same straight line as the position of the first grid line 300. On the premise that the anti-breaking grid line 200 coincides with the solder strip, the first grid line 300 can also coincide with the solder strip, thus not causing an increase in the additional shading area and further improving the photoelectric conversion efficiency of the photovoltaic cell. The length of the anti-breaking grid line 200 is 1.06 mm, and the number of single columns is 38.

[0032] On the other hand, the present application provides a stencil including the above grid line arrangement structure, which can improve the current collection ability and thus improve the photoelectric conversion efficiency of the solar cell.

[0033] Another aspect of the present application provides a photovoltaic cell, including a cell and the above-mentioned stencil. The cell has a main-gridless two-piece structure, and the stencil is provided on each piece, and the two stencils are symmetrically arranged. Specifically, the cell is a Topcon solar cell with a length of 191.6 mm, and the horizontal grid lines 100 are evenly distributed on the cell. This stencil can reduce the occlusion of the cell and improve the photoelectric conversion efficiency of the photovoltaic cell.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] The protection scope of the present utility model is only defined by the claims. Benefiting from the teachings of the present utility model, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present utility model can be used as feasible alternative embodiments, and the embodiments disclosed in the present utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A gate line arrangement structure, comprising a plurality of horizontal gate lines (100) arranged in parallel, characterized in that, On both sides of the arrangement direction of the horizontal grid lines (100), a first grid line (300) and a second grid line (400) are provided. The first grid line (300) and the second grid line (400) are both perpendicular to the horizontal grid lines (100). An anti-break grid line (200) is connected between the horizontal grid lines (100) that are not in contact with the first grid line (300) and the second grid line (400). The anti-break grid line (200) connects two adjacent horizontal grid lines (100). The anti-break grid lines (200) are arranged at intervals from each other, and the anti-break grid line (200) coincides with the position of the solder tape.

2. The gate line arrangement structure according to claim 1, characterized in that, The length of the first grid line (300) is greater than the length of the second grid line (400).

3. A gate line arrangement structure according to claim 2, characterized in that, The first grid line (300) and the second grid line (400) are arranged at intervals and alternately on the first half of the length direction of the horizontal grid line (100). The arrangement of the first grid line (300) and the second grid line (400) on the second half of the length direction of the horizontal grid line (100) is symmetric with the arrangement of the first half.

4. A gate line arrangement structure according to claim 2 or 3, characterized in that, The position of the anti-break grid line (200) is on the same straight line as the position of the first grid line (300).

5. A gate line arrangement structure according to claim 1, characterized in that, The first grid line (300) and the second grid line (400) located on both sides of the arrangement direction of the horizontal grid line (100) are symmetrically arranged with respect to the midline of this arrangement.

6. The gate line arrangement structure according to claim 1, wherein The horizontal grid lines (100) are evenly arranged with a spacing of 1 mm to 1.5 mm.

7. A gate line arrangement structure according to claim 1, characterized in that, The length of the first grid line (300) is 6 mm to 6.5 mm, and the length of the second grid line (400) is 4 mm to 4.5 mm.

8. A stencil, characterized in that It includes the grid line arrangement structure according to any one of claims 1-7.

9. A photovoltaic cell, characterized in that, It includes a battery cell and the stencil according to claim 8.

10. A photovoltaic cell according to claim 9, wherein, The battery cell is a main-gridless two-piece structure, and each piece is provided with this stencil, and the two stencils are symmetrically arranged.

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