Photovoltaic cell and photovoltaic cell preparation screen pattern

Abstract

The invention provides a photovoltaic cell and a photovoltaic cell preparation screen pattern. The photovoltaic cell includes: a photovoltaic substrate; the plurality of auxiliary grids are transversely arranged on the photovoltaic substrate at intervals; the plurality of main grids are longitudinally arranged on the photovoltaic substrate at intervals; each bonding pad corresponds to one main grid, the main grids are connected to the bonding pads, and the main grids penetrate through the bonding pads and extend towards the edge of the photovoltaic substrate, so that each main grid is connected with all the auxiliary grids; and a plurality of pairs of harpoon lines, the plurality of pairs of harpoon lines are transversely arranged on the photovoltaic substrate, each pair of harpoon lines is respectively arranged at two sides of one main grid, and the harpoon lines are connected to the bonding pad. The main grid of the photovoltaic cell can be connected with all the auxiliary grids of the photovoltaic substrate, even if the harpoon line is disconnected from the bonding pad, the auxiliary grids connected with the harpoon line can lead out collected carriers through the main grid, and the problem of local blackening of the cell is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell preparation, and particularly to a photovoltaic cell and a screen printing pattern for preparing a photovoltaic cell. Background Art

[0002] With the development of photovoltaic cell technology, a PERC cell (passivated emitter and rear cell) has emerged. The PERC cell is the mainstream product in the current photovoltaic solar industry. By attaching a dielectric passivation layer to the back of the cell, the PERC cell can greatly reduce the photoelectric loss, thereby improving the photoelectric conversion efficiency of the photovoltaic cell. With the demand for cost reduction, the width of the front side silver busbar is narrowed to less than 20 μm, the designed line width of the screen is close to 10 μm, the opening becomes narrower, and the difficulty of paste penetration increases, and the probability of broken grid increases significantly, affecting the collection and extraction of carriers. In addition, in order to make up for the contact defects, a relatively common structure is to add auxiliary grid lines between the busbars and add harpoon lines at the edge of the cell to extract the carriers collected by the busbars.

[0003] Currently, there are two design schemes for the harpoon lines of existing PERC cells. One is the design in which the busbar at the harpoon line does not penetrate the harpoon line. Due to the lack of grid lines for extracting carriers between the harpoon lines in this design scheme, there is a problem of the cell turning black during EL testing. The other is the design in which the busbar at the harpoon line penetrates the harpoon line. This design can solve the problem of the cell turning black during the above-mentioned EL testing.

[0004] However, in the actual production process of existing PERC cells, the grid lines on both sides of the harpoon line will be blocked due to screen or dry paste reasons, resulting in the phenomenon that the harpoon lines on both sides are directly disconnected from the main grid line, resulting in the carriers collected in the area of multiple busbars near the edge of the silicon wafer between the two main grid lines cannot be effectively extracted, resulting in the problem that the corresponding part of the cell shows local darkening in EL. This problem will be further aggravated when the cell is assembled into a cell module, resulting in the problem of batch degradation of the cell, affecting the output and product quality of the cell module. Summary of the Invention

[0005] Based on this, in view of the problem that the harpoon line and the main grid of the existing photovoltaic cell are prone to disconnection, it is necessary to provide a photovoltaic cell and a screen printing pattern for preparing a photovoltaic cell.

[0006] The present application provides a photovoltaic cell, including:

[0007] A photovoltaic substrate;

[0008] Multiple busbars, the multiple busbars are arranged horizontally at intervals on the photovoltaic substrate;

[0009] Multiple main grids, the multiple main grids are arranged vertically at intervals on the photovoltaic substrate;

[0010] Multiple pads, the pads are disposed on the main grid, and the main grid extends through the pads towards the edge of the photovoltaic substrate so that the main grid is connected to the sub-grid; and

[0011] Multiple pairs of harpoon lines, the multiple pairs of harpoon lines are arranged horizontally on the photovoltaic substrate, the harpoon lines are respectively arranged on both sides of the main grid, and the harpoon lines are connected to the pads.

[0012] In one embodiment, the photovoltaic cell further includes a plurality of auxiliary grid lines, and the auxiliary grid lines are respectively disposed between the sub-grids to connect two adjacent sub-grids.

[0013] In one embodiment, the main grid divides the sub-grid into a plurality of sub-grid segments, and the auxiliary grid lines are respectively disposed on both sides of each sub-grid segment with a dislocation.

[0014] In one embodiment, the auxiliary grid lines on one side of the sub-grid form a first auxiliary grid line group, the auxiliary grid lines on the other side of the sub-grid form a second auxiliary grid line group, the first auxiliary grid line group is uniformly arranged along the direction of the main grid, and the second auxiliary grid line group is uniformly arranged along the direction of the main grid.

[0015] In one embodiment, each pair of harpoon lines connects four sub-grids.

[0016] In one embodiment, the distance between the end of the main grid and the edge of the nearest photovoltaic substrate is less than or equal to 2 mm.

[0017] In one embodiment, the number of the main grids is 11, the length of the main grids is in the range of 180.38 mm to 180.42 mm, and the distance between two adjacent main grids is in the range of 16.26 mm to 16.46 mm.

[0018] In one embodiment, the number of the sub-grids is 176, the length of the sub-grids is in the range of 180.38 mm to 180.42 mm, and the distance between two adjacent sub-grids is in the range of 0.93 mm to 1.13 mm.

[0019] In one embodiment, the distance between the first auxiliary grid line group and the second auxiliary grid line group is 3.97 mm.

[0020] Furthermore, the present application also provides a screen printing pattern for manufacturing a photovoltaic cell, including:

[0021] A screen printing main body; and

[0022] Grid line holes, and the shapes of the grid line holes are the same as the shapes of the grid lines of the photovoltaic cell as described in any one of the above.

[0023] The above photovoltaic cell has optimized the main grid, which can connect all the sub-grids on the photovoltaic substrate including the sub-grid connected by the harpoon line. Even when the harpoon line is disconnected from the pad, the sub-grid connected by the harpoon line can still export the collected carriers through the main grid, avoiding the problem of local blackening of the battery. Brief Description of the Drawings

[0024] Figure 1 A partial schematic diagram of the photovoltaic cell provided for the first example of the present application;

[0025] Figure 2 A partial schematic diagram of the main grid of the photovoltaic cell according to the above first example of the present application;

[0026] Figure 3 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the above first example of the present application;

[0027] Figure 4 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the second example of the present application;

[0028] Figure 5 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the third example of the present application;

[0029] Figure 6 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the fourth example of the present application;

[0030] Figure 7 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the fifth example of the present application;

[0031] Figure 8 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the sixth example of the present application;

[0032] Figure 9 A partial schematic diagram of the auxiliary grid line of the photovoltaic cell according to the seventh example of the present application.

[0033] Reference Numerals: 10, photovoltaic substrate; 20, sub-grid; 21, sub-grid segment; 30, main grid; 31, first main grid segment; 32, second main grid segment; 40, pad; 50, harpoon line; 60, auxiliary grid line; 61, first auxiliary grid line group; 62, second auxiliary grid line group. Detailed Description of the Embodiments

[0034] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do 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 thus should not be construed as a limitation of the present invention.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] It should be noted that when 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. When 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. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] For details, please refer to Figures 1 to 3 The present application provides a photovoltaic cell, which may include a photovoltaic substrate 10, a plurality of auxiliary grids 20, a plurality of main grids 30, a plurality of pads 40, and a plurality of pairs of harpoon wires 50. A plurality of auxiliary grids 20 are arranged transversely on the photovoltaic substrate 10 at intervals, a plurality of main grids 30 are arranged longitudinally on the photovoltaic substrate 10 at intervals, a plurality of pairs of harpoon wires 50 are arranged transversely on the photovoltaic substrate 10, the pads 40 are arranged on the main grid 30, and the main grid 30 passes through the pads 40 and extends toward the edge of the photovoltaic substrate 10, so that the main grid 30 is connected to the auxiliary grid 20. The harpoon wires 50 are arranged on both sides of the main grid 30, and the harpoon wires 50 are connected to the pads 40.

[0041] It can be understood that the photovoltaic cell has optimized the main grid 30, the harpoon line 50 is connected to the sub-grid 20 at the edge of the photovoltaic substrate 10, and the main grid 30 can be connected to the sub-grid 20 connected to the harpoon on the photovoltaic substrate 10, forming two channels. The carriers collected by the sub-grid 20 at the edge of the photovoltaic substrate 10 can be exported through the harpoon line 50 or the main grid 30. The main grid 30 can connect all the sub-grids 20. When the harpoon line 50 is disconnected from the pad 40 due to printing problems, the main grid 30 can still export the carriers collected by the sub-grid 20. The main grid 30 can also pass through the pad 40 to connect one or more sub-grids 20 connected to the harpoon line 50. When the harpoon line 50 is disconnected from the pad 40 due to printing problems, the carriers collected by the sub-grid 20 connected to the harpoon line can be exported to the sub-grid 20 connected to the main grid 30 through the harpoon line 50, and then exported from the main grid 30, avoiding the problem of local blackening of the photovoltaic cell caused by carrier accumulation.

[0042] More specifically, if Figure 2As shown, in one embodiment, the main grid 30 includes a first main grid segment 31 located between two of the pads 40 and two second main grid segments 32 extending outward from the pads 40 to the outside of the photovoltaic substrate 10. The first main grid segment 31 and the second main grid segments 32 are interconnected. The first main grid segment 31 is connected to the auxiliary grid 20 not connected to the harpoon line 50, and the second main grid segment 32 is connected to the auxiliary grid 20 connected to the harpoon line 50. When printing the grid lines, the pads 40 are printed on the main grid 30 to form the first main grid segment 31 and the second main grid segments 32.

[0043] Each of the pads 40 corresponds to one main grid 30 and a pair of harpoon lines 50. The pads 40 are used to connect the bus bars or interconnection bars of the photovoltaic cell to export the carriers collected by the main grid 30 and the harpoon lines 50 from the auxiliary grid 20 out of the photovoltaic cell. With such an arrangement, the carriers exported from the auxiliary grid 20 can be exported to the bus bar or interconnection bar without passing through the main grid 30, reducing the carrier transmission path, reducing the carrier transmission loss, and improving the conversion efficiency of the photovoltaic cell.

[0044] Furthermore, as Figure 1 and Figure 3 shown, in one embodiment, the photovoltaic cell further includes a plurality of auxiliary grid lines 60 respectively disposed between the auxiliary grids 20 to connect two adjacent auxiliary grids 20. With such an arrangement, the auxiliary grid lines 60 connect the respective auxiliary grids 20, adding an interconnected channel between the auxiliary grids 20, enabling the carriers collected by one auxiliary grid 20 to be exported to another auxiliary grid 20 through the auxiliary grid lines 60. In this way, when one of the auxiliary grids 20 is disconnected from the main grid 30, the auxiliary grid 20 can still export the collected carriers through the auxiliary grid lines 60, avoiding the problem of local darkening of the battery.

[0045] Preferably, as Figure 3 shown, in one embodiment, the main grid 30 divides the auxiliary grid 20 into a plurality of auxiliary grid segments 21, and the auxiliary grid lines 60 are disposed on both sides of each of the auxiliary grid segments 21 in a mutually staggered manner. Since the auxiliary grid lines 60 will cover the photovoltaic substrate 10, resulting in a reduction in the light-receiving surface of the photovoltaic substrate 10, the number of the auxiliary grid lines 60 is controlled such that only one auxiliary grid line 60 is connected between every two auxiliary grid segments 21, and the area of the photovoltaic substrate 10 connected by the auxiliary grid lines 60 is smaller. In addition, the auxiliary grid lines 60 on both sides of one auxiliary grid segment 21 are arranged in a staggered manner. When one auxiliary grid segment 21 is disconnected from the main grid 30, the carriers collected by the disconnected auxiliary grid segment 21 can be exported through the auxiliary grid line 60 closest to the main grid 30, with a faster carrier export speed, avoiding local accumulation of carriers on the photovoltaic substrate 10 and avoiding the problem of local darkening of the battery.

[0046] It is worth noting that only one auxiliary gate line 60 is provided on each side of the auxiliary gate segment 21 , which can also reduce the cost of printing the auxiliary gate line 60 and the material cost of the auxiliary gate line, thereby reducing the production cost of the photovoltaic cell.

[0047] More preferably, if Figure 3 As shown, in one embodiment, the auxiliary grid lines 60 on one side of the auxiliary grid 20 form a first auxiliary grid line group 61, and the auxiliary grid lines 60 on the other side of the auxiliary grid 20 form a second auxiliary grid line group 62. The first auxiliary grid line group 61 is evenly arranged along the direction of the main grid 30, and the second auxiliary grid line group 62 is evenly arranged along the direction of the main grid 30. In this way, the auxiliary grid lines 60 are more evenly distributed between the auxiliary grids 20, with a wider connection range, and can more comprehensively derive the carriers collected by the auxiliary grid 20. In addition, the uniform arrangement of the auxiliary grid lines 60 makes it simpler to prepare the printing screen and print the grid lines, which can improve the printing quality of the photovoltaic cell.

[0048] Alternatively, due to the limitation of production technology, it is usually difficult to print the auxiliary grid 20 at the edge of the photovoltaic substrate 10, and the auxiliary grid 20 is generally difficult to collect the carriers generated at the edge of the photovoltaic substrate 10. Figure 2 As shown, in one embodiment, the photovoltaic cell includes a pair of the harpoon wires 50 connecting four of the subgrids 20. In this way, the four subgrids 20 at the edge of the photovoltaic cell are respectively connected to the harpoon wires 50 and the main grid 30, which can quickly guide the carriers at the edge of the photovoltaic substrate 10, avoiding the problem of the photovoltaic substrate 10 becoming black due to the accumulation of carriers at the edge of the photovoltaic substrate 10.

[0049] Alternatively, if Figure 2 As shown, in one embodiment, the distance between the end of the main grid 30 and the nearest edge of the photovoltaic substrate 10 is less than or equal to 2 mm. In this way, the main grid 30 can cover the edge of the photovoltaic substrate 10 as much as possible, and the auxiliary grid 20 can be arranged closer to the edge of the photovoltaic substrate 10. In this way, the auxiliary grid 20 can collect the carriers generated by the edge of the photovoltaic substrate 10 as much as possible, and guide them out through the main grid 30, avoiding the problem of carrier accumulation and improving the photoelectric conversion rate of the photovoltaic cell.

[0050] Exemplarily, in one embodiment, the number of the main grids 30 is 11, the length of the main grids 30 ranges from 180.38 mm to 180.42 mm, and the spacing between two adjacent main grids 30 ranges from 16.26 mm to 16.46 mm. The number of the auxiliary grids 20 is 176, the length of the auxiliary grids 20 ranges from 180.38 mm to 180.42 mm, and the spacing between two adjacent auxiliary grids 20 ranges from 0.93 mm to 1.13 mm. The main grids 30 and the auxiliary grids 20 are evenly arranged on the photovoltaic substrate 10. When the main grids 30 and the auxiliary grids 20 meet the above conditions, on the one hand, the main grids 30 and the auxiliary grids 20 can more comprehensively collect the carriers generated by the photovoltaic substrate 10; on the other hand, the widths of the main grids 30 and the auxiliary grids 20 are appropriate, which can ensure the light-receiving area of the photovoltaic substrate 10 and avoid excessive main grids 30 and auxiliary grids 20 from blocking the photovoltaic substrate 10, thus affecting the photoelectric conversion rate of the photovoltaic cell.

[0051] It should be noted that, as Figure 3 shown, in one embodiment, a pair of harpoon lines 50 are respectively arranged at both ends of one of the main grids 30, and the photovoltaic cell includes 22 pairs of harpoon lines 50.

[0052] Exemplarily, as Figure 3 shown, in one embodiment, the spacing between the first auxiliary grid line group 61 and the second auxiliary grid line group 62 is 3.97 mm. With such a setting, when the main grids 30 and the auxiliary grids 20 meet the above conditions, and the spacing between the auxiliary grid lines 60 of the first auxiliary grid line group 61 and the auxiliary grid lines 60 of the second auxiliary grid line group 62 meets the above conditions, a better current guiding effect can be obtained, and the carriers collected by the auxiliary grids 20 can be exported to the main grids 30 faster, improving the photoelectric conversion rate of the photovoltaic cell.

[0053] Furthermore, the present application verifies the arrangement of the main grids and the auxiliary grid lines of the photovoltaic cells in some embodiments.

[0054] As Figure 3 shown, in the first example, the photovoltaic cell includes two groups of auxiliary grid lines 60, and the two groups of auxiliary grid lines 60 are respectively arranged between the auxiliary grid segments 21 according to the above-mentioned first auxiliary grid line group 61 and the second auxiliary grid line group 62, and the main grid 30 of the photovoltaic cell extends outward to the outermost auxiliary grid 20 of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the first example obtained by EL testing is 0%.

[0055] As Figure 4As shown, in the second example, the photovoltaic cell includes two sets of auxiliary grid lines 60. Both sets of the auxiliary grid lines 60 are arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61. The main grid 30 of the photovoltaic cell extends outward to the outermost sub-grid 20 of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the second example obtained by EL testing is 10%.

[0056] As Figure 5 shown, in the third example, the photovoltaic cell includes two sets of auxiliary grid lines 60. The two sets of the auxiliary grid lines 60 are respectively arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61 and the second auxiliary grid line group 62. The main grid 30 of the photovoltaic cell extends outward to the second sub-grid 20 starting from the outer edge of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the third example obtained by EL testing is 10%.

[0057] As Figure 6 shown, in the fourth example, the photovoltaic cell includes two sets of auxiliary grid lines 60. Both sets of the auxiliary grid lines 60 are arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61. The main grid 30 of the photovoltaic cell extends outward to the second sub-grid 20 starting from the outer edge of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the fourth example obtained by EL testing is 15%.

[0058] As Figure 7 shown, in the fifth example, the photovoltaic cell includes two sets of auxiliary grid lines 60. The two sets of the auxiliary grid lines 60 are respectively arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61 and the second auxiliary grid line group 62. The main grid 30 of the photovoltaic cell extends outward to the third sub-grid 20 starting from the outer edge of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the fifth example obtained by EL testing is 19%.

[0059] As Figure 8 shown, in the sixth example, the photovoltaic cell includes two sets of auxiliary grid lines 60. Both sets of the auxiliary grid lines 60 are arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61. The main grid 30 of the photovoltaic cell extends outward to the third sub-grid 20 starting from the outer edge of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the sixth example obtained by EL testing is 20%.

[0060] As Figure 9 shown, in the seventh example, the photovoltaic cell only includes one set of auxiliary grid lines 60. The auxiliary grid line 60 is arranged between the sub-grid segments 21 according to the above-mentioned first auxiliary grid line group 61. The main grid 30 of the photovoltaic cell extends outward to the fifth sub-grid 20 starting from the outer edge of the photovoltaic substrate. The EL open-circuit ratio of the photovoltaic cell in the seventh example obtained by EL testing is 25%.

[0061] It can be understood that, according to the above examples, the more sub-gates 20 covered by the main gate 30, the lower the EL disconnection ratio of the photovoltaic cell. The auxiliary grid lines 60 are arranged according to the first auxiliary grid line group 61 and the second auxiliary grid line group 62, and the EL disconnection ratio of the photovoltaic cell is even lower. The photovoltaic cell of the present application can reduce the EL disconnection ratio from 25% to 0%.

[0062] In summary, the present invention provides a photovoltaic cell. The main gate 30 of the photovoltaic cell is optimized. The main gate 30 of the photovoltaic cell can not only connect the sub-gates 20 in the photovoltaic cell, but also connect the sub-gates 20 connected by the harpoon line 50, so that the sub-gates 20 connected by the harpoon line 50 can export carriers through two channels of the main gate 30 and the harpoon line 50. When the harpoon line 50 is disconnected from the pad 40 due to printing problems, the carriers collected by the sub-gates 20 at the edge of the photovoltaic substrate can be exported through the main gate 30; in addition, a plurality of auxiliary grid lines 60 are arranged between the sub-gates 20 of the photovoltaic substrate, and auxiliary grid lines 60 are arranged on both sides of each sub-gate segment 21 in a mutually staggered manner, and the auxiliary grid lines 60 can connect adjacent sub-gate segments 21 to each other. When one of the sub-gate segments 21 is disconnected from the main gate 30, the sub-gate segment 21 can still export the collected carriers through the auxiliary grid lines 60, avoiding the problem of local blackening of the battery.

[0063] Furthermore, the present application also provides a photovoltaic cell preparation screen pattern, which may include: a screen main body and grid line holes, and the shape of the grid line holes is the same as the shape of the grid lines of the photovoltaic cell described in any one of the above. The photovoltaic cell preparation screen pattern can print the grid lines of the photovoltaic cell described in any one of the above. Even if there is a problem that the harpoon line 50 is disconnected from the pad 40 in the photovoltaic cell prepared by the photovoltaic cell preparation screen pattern, the sub-gates 20 connected by the harpoon line 50 can still export carriers through the main gate 30, avoiding carrier accumulation, improving the yield rate of the photovoltaic cell, and reducing the repair rate of the photovoltaic cell.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0065] The above-described embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A photovoltaic cell, characterized in that, it comprises: a photovoltaic substrate; a plurality of sub-gates, and the plurality of sub-gates are horizontally arranged on the photovoltaic substrate at intervals; a plurality of main gates, and the plurality of main gates are vertically arranged on the photovoltaic substrate at intervals; a plurality of pads, the pads are arranged on the main gates, and the main gates extend through the pads to the edge of the photovoltaic substrate so that the main gates connect the sub-gates; and multiple pairs of harpoon lines, the multiple pairs of harpoon lines are horizontally arranged on the photovoltaic substrate, the harpoon lines are respectively arranged on both sides of the main gate, and the harpoon lines are connected to the pads.

2. The photovoltaic cell according to claim 1, characterized in that, the photovoltaic cell further comprises a plurality of auxiliary grid lines, and the auxiliary grid lines are respectively arranged between the sub-gates to connect two adjacent sub-gates.

3. The photovoltaic cell according to claim 2, characterized in that, the main gate divides the sub-gates into a plurality of sub-gate segments, and the auxiliary grid lines are arranged in a staggered manner on both sides of each sub-gate segment.

4. The photovoltaic cell according to claim 3, characterized in that, the auxiliary grid lines on one side of the sub-gate form a first auxiliary grid line group, the auxiliary grid lines on the other side of the sub-gate form a second auxiliary grid line group, the first auxiliary grid line group is uniformly arranged along the direction of the main gate, and the second auxiliary grid line group is uniformly arranged along the direction of the main gate.

5. The photovoltaic cell according to any one of claims 1 to 4, characterized in that, each pair of harpoon lines connects four sub-gates.

6. The photovoltaic cell according to any one of claims 1 to 4, characterized in that, the distance between the end of the main gate and the edge of the nearest photovoltaic substrate is less than or equal to 2 mm.

7. The photovoltaic cell according to any one of claims 1 to 4, characterized in that, the number of the main gates is 11, the length of the main gates is in the range of 180.38 mm to 180.42 mm, and the distance between two adjacent main gates is in the range of 16.26 mm to 16.46 mm.

8. The photovoltaic cell according to any one of claims 1 to 4, characterized in that, the number of the sub-gates is 176, the length of the sub-gates is in the range of 180.38 mm to 180.42 mm, and the distance between two adjacent sub-gates is in the range of 0.93 mm to 1.13 mm.

9. The photovoltaic cell according to claim 4, characterized in that, the distance between the first auxiliary grid line group and the second auxiliary grid line group is 3.97 mm.

10. A screen printing pattern for manufacturing a photovoltaic cell, characterized in that, it comprises: a screen printing main body; and grid line holes, and the shapes of the grid line holes are the same as the shapes of the grid lines of the photovoltaic cell according to any one of claims 1 to 9.

Images