Solar cell, photovoltaic module, photovoltaic system and printing screen

Abstract

The application is suitable for the technical field of batteries, and provides a solar cell, a photovoltaic module, a photovoltaic system and a printing screen plate, the solar cell comprising: a silicon substrate and a plurality of subgrids, the plurality of subgrids comprising two subgrids with different polarities; the plurality of subgrids are arranged on the silicon substrate and extend along a first direction, the two subgrids with different polarities are alternately and spacedly arranged along a second direction, and the first direction intersects the second direction; among the plurality of subgrids, the interval between a first subgrid and a second subgrid and a third subgrid is not equal; the second subgrid and the third subgrid are adjacent to the first subgrid and have different polarities from the first subgrid; among the subgrids with the same polarity as the first subgrid, the interval between the first subgrid and a fourth subgrid and a fifth subgrid is not equal, and the fourth subgrid and the fifth subgrid are adjacent to the first subgrid. The solar cell, the photovoltaic module, the photovoltaic system and the printing screen plate provided by the application can reduce the problem of broken grids and improve the product yield of the solar cell.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a solar cell, a photovoltaic module, a photovoltaic system and a printing screen. BACKGROUND

[0002] In the related art, a printing screen is composed of a screen gauze woven from stainless steel wires with different mesh sizes, latex coated on the screen gauze, and a screen frame supporting the screen gauze. The latex is removed at the opening of the printed pattern, so that when the squeegee is brushed across the screen gauze, the paste applied on the screen is allowed to pass through the opening of the printed pattern and thus printed on the substrate. Since the screen has knots, the knots may block the flow of the paste, resulting in uneven printing lines or broken lines. Therefore, the printed pattern corresponding to part of the sub-bus may coincide with the knots, leading to broken bus bars when printing the sub-bus. SUMMARY

[0003] The present application provides a solar cell, a photovoltaic module, a photovoltaic system and a printing screen, aiming to solve the problem of broken bus bars in printing sub-bus.

[0004] The present application provides a solar cell, comprising: a silicon substrate and a plurality of sub-bus, the plurality of sub-bus including two sub-bus with different polarities;

[0005] The plurality of sub-bus is arranged on the silicon substrate and extends along a first direction, and the two sub-bus with different polarities are alternately and spacedly arranged along a second direction, and the first direction intersects the second direction;

[0006] In the plurality of sub-bus, the first sub-bus has unequal spacing with a second sub-bus and a third sub-bus, respectively; the second sub-bus and the third sub-bus are adjacent to the first sub-bus and have different polarities from the first sub-bus;

[0007] In the sub-bus with the same polarity as the first sub-bus, the first sub-bus has unequal spacing with a fourth sub-bus and a fifth sub-bus, respectively, and the fourth sub-bus and the fifth sub-bus are adjacent to the first sub-bus.

[0008] In some embodiments, the spacing between two adjacent sub-bus in the sub-bus with the same polarity is adjusted based on the mesh size of the printing screen corresponding to the sub-bus with the same polarity.

[0009] In some embodiments, the plurality of sub-bus includes first sub-bus and second sub-bus with different polarities;

[0010] The unequal spacing between two adjacent sub-bus in the at least one group of sub-bus includes at least one of the following cases:

[0011] The unequal spacing between the first sub-bus and two second sub-bus adjacent to the first sub-bus;

[0012] The distance between the second sub-grid and two first sub-grids adjacent to the second sub-grid is not equal.

[0013] In some embodiments, the mesh size is A μm, the initial distance between two adjacent sub-grids in the sub-grids with the same polarity is B mm; the two adjacent sub-grids in the sub-grids with the same polarity include a target sub-grid, the target sub-grid is a sub-grid corresponding to a printing pattern of the plurality of sub-grid pairs and contacting a mesh knot of the printing screen;

[0014] The distance adjustment range of the two adjacent sub-grids in the sub-grids with the same polarity is greater than (B-A) mm and less than (B+A) mm.

[0015] In some embodiments, the mesh size is 40 μm to 50 μm.

[0016] In some embodiments, the initial distance between the two adjacent sub-grids in the sub-grids with the same polarity is 0.9 mm to 1.1 mm.

[0017] In some embodiments, the line width of the first sub-grid is less than 33 μm.

[0018] In some embodiments, the line width of the second sub-grid is less than 30 μm.

[0019] The present application also provides a photovoltaic module, comprising the solar cell according to any one of the above.

[0020] The present application also provides a photovoltaic system, comprising the photovoltaic module according to the above.

[0021] The present application also provides a printing screen, comprising a screen frame, a screen cloth and a printing pattern corresponding to a plurality of sub-grids, the screen cloth is fixed on the screen frame, and the printing pattern is located on the screen cloth; the screen cloth is interwoven by warp and weft, and the warp and the weft intersect to form a plurality of mesh knots; the printing pattern does not pass through the plurality of mesh knots.

[0022] The solar cell, the photovoltaic module, the photovoltaic system and the printing screen provided by the present application can avoid the mesh knot when the grid line is printed by adjusting the distance between the sub-grids, so that after the printing is completed, there is at least one first sub-grid whose distance with the adjacent second sub-grid and third sub-grid is not equal, and there is at least one first sub-grid whose distance with the adjacent fourth sub-grid and fifth sub-grid with the same polarity is not equal, which can reduce the problem of broken grid and improve the product yield of the solar cell. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is one of the structure schematic diagrams of the solar cell provided by the embodiments of the present application;

[0024] Figure 2 is a structural schematic diagram of a knot provided by an embodiment of the present application;

[0025] Figure 3 is a structural schematic diagram of a solar cell provided by an embodiment of the present application;

[0026] Figure 4 is a structural schematic diagram of a printed pattern provided by an embodiment of the present application;

[0027] Figure 5 is a structural schematic diagram of a photovoltaic module provided by an embodiment of the present application;

[0028] Figure 6 is a structural schematic diagram of a photovoltaic system provided by an embodiment of the present application;

[0029] Figure 7 is a structural schematic diagram of a printing screen provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0031] In the present application, the term "embodiment" or "implementation" means that the specific features, components or characteristics described in connection with the embodiment or implementation can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The following will be described in detail Figures 1 to 7 , the solar cell 101, the photovoltaic module, the photovoltaic system and the printing screen provided by the embodiment of the present application through specific examples and application scenarios.

[0035] Figure 1 is one of the structural schematic diagrams of the solar cell 101 provided by the embodiment of the present application. As Figure 1 shown, the present application provides a solar cell 101, comprising: a silicon substrate 10 and a plurality of sub-grids 20, the plurality of sub-grids 20 comprising two sub-grids 20 with different polarities;

[0036] The plurality of sub-grids 20 are arranged on the silicon substrate 10 and extend along a first direction, and the two sub-grids 20 with different polarities are alternately and spacedly arranged along a second direction, and the first direction intersects the second direction;

[0037] The distance between at least one sub-grid 20 and two adjacent sub-grids 20 with the same polarity is not equal;

[0038] The distance between two adjacent sub-grids 20 in at least one group of sub-grids 20 is not equal, and each group of sub-grids 20 comprises three sub-grids 20 arranged continuously.

[0039] Among the plurality of sub-grids 20, the distance between the first sub-grid 201 and the second sub-grid 202 and the third sub-grid 203 is not equal, the second sub-grid 202 and the third sub-grid 203 are adjacent to the first sub-grid 201, and the polarities of the first sub-grid 201, the second sub-grid 202 and the third sub-grid 203 are different;

[0040] Among the sub-grids 20 with the same polarity as the first sub-grid 201, the distance between the first sub-grid 201 and the fourth sub-grid 204 and the fifth sub-grid 205 is not equal, and the fourth sub-grid 204 and the fifth sub-grid 205 are adjacent to the first sub-grid 201.

[0041] In the embodiment of the present application, the solar cell 101 can be a solar cell without busbars or a solar cell with busbars. The silicon substrate 10 included in the solar cell 101 can be a whole cell piece, or a half cell piece, a third cell piece, or a cell piece with other proportion, which is divided from a whole cell piece. It should be noted that the drawings provided in the embodiment of the present application are schematic drawings, and do not limit the specific forms of the solar cell 101.

[0042] Further, the silicon substrate 10 includes two opposite surfaces, including a light-receiving surface facing the sun, which mainly receives direct sunlight, and a back surface facing a mounting surface of the photovoltaic module, which mainly receives sunlight reflected by the mounting surface, for example, the ground, a roof, etc. The light-receiving surface or the back surface of the silicon substrate 10 can be provided with the busbars 20. In addition, the surface of the silicon substrate 10 provided with the busbars 20 further includes a doped layer and a passivation layer arranged in a stack, and the doped layer can be connected with the busbars 20 to establish an ohmic contact.

[0043] The busbars 20 include two busbars 20 with different polarities, for example, a positive busbar and a negative busbar. The busbars 20 extend along a first direction, and the two busbars 20 with different polarities are arranged alternately and spaced apart along a second direction, and the second direction intersects the first direction. The first direction can be the length direction of the busbar 20, that is, the horizontal direction in FIG. 1; and the second direction can be the width direction of the busbar 20, that is, the vertical direction in FIG. 1. Of course, in other embodiments, the first direction and the second direction can also be other directions, for example, diagonal directions, etc., which are not limited herein. Figure 1 Figure 1 Of course, in other embodiments, the first direction and the second direction can also be other directions, for example, diagonal directions, etc., which are not limited herein.

[0044] In the solar cell 101 with busbars, the silicon substrate 10 can be provided with busbars on the front surface or the back surface, and the busbars are used to collect the current on the busbars 20 and conduct the current to the outside of the cell. In the solar cell 101 without busbars, the back surface of the solar cell 101 can adopt a solder strip to collect the current collected by the busbars 20.

[0045] In the embodiment of the present application, the busbars 20 are arranged at non-equal intervals in the second direction. Figure 1 The busbars 20 in FIG. 1 can be busbars 20 in a whole cell piece, busbars 20 in a local area of a whole cell piece, or busbars 20 in a solar cell 101 divided from a whole cell piece, such as a half cell piece, a third cell piece, or a cell piece with other proportion, which are not limited herein.

[0046] In the related art, the printing sequence of the busbars of the solar cell is as follows: a first screen printing is performed to print the busbars, and a second screen printing and a third screen printing are performed to print two busbars with different polarities, respectively.

[0047] The busbars are arranged at equal intervals, and the printing pattern of a single printing screen is used to print busbars with the same polarity. For example, as shown in FIG. 2, the busbars 20 are arranged at equal intervals in the second direction, and the printing pattern of a single printing screen is used to print busbars with the same polarity.​Figure 2 As shown in the figure, the screen is formed by interlacing warp and weft yarns according to a certain rule. In the interlacing process, the yarns form nodes at the intersection points, and these nodes are the knots 30. The printing patterns corresponding to the sub-gates of the same polarity are also arranged at equal intervals, and the extension direction of the printing patterns corresponding to the sub-gates is parallel to the yarns of the printing screen. Under this arrangement, the printing patterns corresponding to some sub-gates may cover the yarns where the knots 30 are located or contact at least part of the area corresponding to the knots 30, and thus the knots 30 may block the flow of the paste, resulting in the appearance of broken sub-gates in the printing of the knots.

[0048] In the embodiment of the present application, the position of the printing pattern corresponding to this part of the sub-gate can be adjusted to make this part of the sub-gate avoid the knots, so that at least one sub-gate 20 and the two adjacent sub-gates 20 of the same polarity will have unequal intervals on the silicon substrate 10.

[0049] It should be noted that in the embodiment of the present application, the interval of the sub-gate refers to the distance between the two opposite edges of the two sub-gates.

[0050] As shown in the figure, the screen is formed by interlacing warp and weft yarns according to a certain rule. In the interlacing process, the yarns form nodes at the intersection points, and these nodes are the knots 30. The printing patterns corresponding to the sub-gates of the same polarity are also arranged at equal intervals, and the extension direction of the printing patterns corresponding to the sub-gates is parallel to the yarns of the printing screen. Under this arrangement, the printing patterns corresponding to some sub-gates may cover the yarns where the knots 30 are located or contact at least part of the area corresponding to the knots 30, and thus the knots 30 may block the flow of the paste, resulting in the appearance of broken sub-gates in the printing of the knots. Figure 1 As shown in the figure, the screen is formed by interlacing warp and weft yarns according to a certain rule. In the interlacing process, the yarns form nodes at the intersection points, and these nodes are the knots 30. The printing patterns corresponding to the sub-gates of the same polarity are also arranged at equal intervals, and the extension direction of the printing patterns corresponding to the sub-gates is parallel to the yarns of the printing screen. Under this arrangement, the printing patterns corresponding to some sub-gates may cover the yarns where the knots 30 are located or contact at least part of the area corresponding to the knots 30, and thus the knots 30 may block the flow of the paste, resulting in the appearance of broken sub-gates in the printing of the knots.

[0051] Among the plurality of sub-gates 20, the second sub-gate 202 and the third sub-gate 203 are two sub-gates 20 adjacent to the first sub-gate 201 and different in polarity from the first sub-gate 201; the fourth sub-gate 204 and the fifth sub-gate 205 are two sub-gates 20 adjacent to the first sub-gate 201 among the sub-gates 20 of the same polarity as the first sub-gate 201.

[0052] The second sub-gate 202 is arranged between the first sub-gate 201 and the fourth sub-gate 204, and the third sub-gate 203 is arranged between the first sub-gate 201 and the fifth sub-gate 205.

[0053] Among the plurality of sub-gates 20, the second sub-gate 202 and the third sub-gate 203 are two sub-gates 20 adjacent to the first sub-gate 201 and different in polarity from the first sub-gate 201; the fourth sub-gate 204 and the fifth sub-gate 205 are two sub-gates 20 adjacent to the first sub-gate 201 among the sub-gates 20 of the same polarity as the first sub-gate 201.

[0054] Among the plurality of sub-gates 20, the second sub-gate 202 and the third sub-gate 203 are two sub-gates 20 adjacent to the first sub-gate 201 and different in polarity from the first sub-gate 201; the fourth sub-gate 204 and the fifth sub-gate 205 are two sub-gates 20 adjacent to the first sub-gate 201 among the sub-gates 20 of the same polarity as the first sub-gate 201.

[0055] It should be noted that when two intervals are compared, the absolute value of the difference between the two intervals is less than 0.05mm, and the two intervals can be considered equal.

[0056] In the sub-grid 20 with a polarity different from that of the first sub-grid 201, the interval between the two adjacent sub-grids 20 with the same polarity can also be D4 and D9. Among them, D4 is less than D9.

[0057] In the sub-grid 20 with a polarity different from that of the first sub-grid 201, the interval between the two adjacent sub-grids 20 with the same polarity can also be D5 and D6. Among them, D5 is equal to D6, D4 is less than D5, and D5 is less than D9.

[0058] In the plurality of sub-grids 20 arranged along the second direction, the interval between the two adjacent sub-grids 20 can be equal or unequal. The interval between the middle sub-grid 20 and its adjacent two sub-grids 20 in the plurality of sub-grids 20 arranged continuously can be the interval between the first sub-grid 201 and the second sub-grid 202, or the interval d1 between the first sub-grid 201 and the interval d2 between the third sub-grid 203. Among them, d1 is less than d2, d1 is less than d3, and d3 is less than d2.

[0059] The interval between the two adjacent sub-grids 20 can also be d3, d4, d5, d6 or d7. Among them, d6 is greater than d7, d6 is greater than d5, d5 is greater than d7, and d3 is equal to d4, and d4 is equal to d5.

[0060] The solar cell 101 provided by the embodiment of the present application avoids the mesh knot on the printing screen plate. In the plurality of sub-grids arranged on the silicon substrate, there is at least one group of sub-grids with unequal intervals between the two adjacent sub-grids, and there is at least one sub-grid with unequal intervals between the two adjacent sub-grids with the same polarity. By adjusting the interval of the sub-grid, the possibility of the sub-grid overlapping with the mesh knot is reduced, thereby reducing the problem of broken grid and improving the product yield of the solar cell 101.

[0061] In some embodiments, the interval between the two adjacent sub-grids 20 with the same polarity in the plurality of sub-grids 20 is adjusted based on the mesh size of the printing screen plate corresponding to the plurality of sub-grids 20.

[0062] In actual execution, the printing pattern corresponding to the sub-grid 20 is between the two adjacent parallel yarns to avoid falling on the mesh knot 30. Therefore, the mesh size determines the position adjustment range of the printing pattern corresponding to the sub-grid 20, and further determines the interval between the two adjacent sub-grids 20 with the same polarity. The mesh size refers to the distance between the two adjacent mesh knots 30 or the two adjacent mesh wires in the screen plate.

[0063] It is understandable that the larger the mesh size, the greater the range of position adjustment of the printed pattern corresponding to the sub-grid 20, and the greater the range of spacing between two adjacent sub-grids 20 of the same polarity.

[0064] For example, if the mesh size is 50μm and the spacing between two adjacent sub-grids 20 of the same polarity is 1mm, and if a sub-grid 20 covers the yarn where the knot 30 is located or contacts at least part of the area corresponding to the knot 30, then the sub-grid 20 is translated along the second direction, and the spacing adjustment range is greater than 0.95mm and less than 1.05mm.

[0065] In some embodiments, the mesh size is A μm, and the initial spacing between two adjacent sub-gates 20 with the same polarity is B mm; two adjacent sub-gates 20 with the same polarity include a target sub-gate 201, which is a sub-gate of the printing pattern corresponding to a plurality of sub-gates 20 covering the mesh of the printing screen.

[0066] The spacing adjustment range of two adjacent sub-gates 20 with the same polarity is greater than (BA) mm and less than (B+A) mm.

[0067] like Figure 3 As shown, taking the first sub-gate 201 and the fourth sub-gate 204 as examples, the first sub-gate 201 is the target sub-gate 201 in this embodiment of the invention, and the fourth sub-gate 204 is the non-target sub-gate 204. The target sub-gate 201 and the non-target sub-gate 204 are two adjacent sub-gates 20 with the same polarity. Before adjusting the position of the printed pattern corresponding to the target sub-gate 201, the two adjacent sub-gates 20 are the target sub-gate 201 and the non-target sub-gate 204. The target sub-gate 201 is in contact with the yarn corresponding to the mesh 30, and the non-target sub-gate 204 is not in contact with the yarn corresponding to the mesh 30.

[0068] The initial spacing between two adjacent sub-gates 20 with the same polarity is B mm, and the mesh size is A μm. The printed pattern corresponding to the target sub-gate 201 can be translated A μm to both sides in the second direction, such as... Figure 4 As shown, the target sub-grid 201 is shifted upwards by a certain distance, thereby avoiding the yarn corresponding to the web knot 30 on the screen. The spacing between two adjacent sub-grids 20 with the same polarity is adjusted to be greater than (BA) mm and less than (B+A) mm. The printed pattern is a pattern located on the printing screen used to print the sub-grid 20 with the same polarity as the first sub-grid 201.

[0069] In some embodiments, the mesh size is 40μm~50μm.

[0070] Optionally, when A equals 40, the mesh size is 40 μm, assuming that the initial interval of the two adjacent subgrids 20 with the same polarity is 1 mm, in the case that the yarn corresponding to the covering knot 30 or the at least partial area corresponding to the contact knot 30 exists between the two adjacent subgrids 20, the interval adjustment range of the two adjacent subgrids 20 can be greater than 0.96 mm and less than 1.04 mm.

[0071] Optionally, when A equals 50, the mesh size is 50 μm, assuming that the initial interval of the two adjacent subgrids 20 with the same polarity is 1 mm, in the case that the yarn corresponding to the covering knot 30 or the at least partial area corresponding to the contact knot 30 exists between the two adjacent subgrids 20, the interval adjustment range of the two adjacent subgrids 20 can be greater than 0.95 mm and less than 1.05 mm.

[0072] In some embodiments, the initial interval of the two adjacent subgrids 20 with the same polarity is 0.9 mm to 1.1 mm.

[0073] Optionally, when A equals 40, the mesh size is 40 μm, assuming that the initial interval of the two adjacent subgrids 20 with the same polarity is 0.9 mm, in the case that the yarn corresponding to the covering knot 30 or the at least partial area corresponding to the contact knot 30 exists between the two adjacent subgrids 20, the interval adjustment range of the two adjacent subgrids 20 can be greater than 0.86 mm and less than 0.94 mm.

[0074] Optionally, when A equals 40, the mesh size is 40 μm, assuming that the initial interval of the two adjacent subgrids 20 with the same polarity is 1 mm, in the case that the yarn corresponding to the covering knot 30 or the at least partial area corresponding to the contact knot 30 exists between the two adjacent subgrids 20, the interval adjustment range of the two adjacent subgrids 20 can be greater than 0.96 mm and less than 1.04 mm.

[0075] Optionally, when A equals 40, the mesh size is 40 μm, assuming that the initial interval of the two adjacent subgrids 20 with the same polarity is 1.1 mm, in the case that the yarn corresponding to the covering knot 30 or the at least partial area corresponding to the contact knot 30 exists between the two adjacent subgrids 20, the interval adjustment range of the two adjacent subgrids 20 can be greater than 1.06 mm and less than 1.14 mm.

[0076] In some embodiments, the line width of the first subgrid 201 is less than 33 μm.

[0077] In actual implementation, the first auxiliary grid 201 is a P region auxiliary grid, and the line width of a conventional P region auxiliary grid is about 38 μm. Since the printing pattern corresponding to the first auxiliary grid 201 can avoid the screen joints, the printed second auxiliary grid 202 is not prone to have a broken grid, and thus the line width of the first auxiliary grid 201 can be reduced. In the embodiment of the present application, the first auxiliary grid 201 can be 5 μm to 6 μm smaller than the width of a conventional P region auxiliary grid, that is, the line width of the first auxiliary grid 201 can be less than 33 μm. Refining the first auxiliary grid 201 can increase the light receiving area and improve the conversion efficiency of the solar cell 101.

[0078] It can be understood that, in the case of printing a wider auxiliary grid, the printing pattern corresponding to the wider auxiliary grid does not need to consider whether it coincides with the screen joint, and the paste can be directly printed through the screen joint and will not have a broken grid.

[0079] In some embodiments, the line width of the second auxiliary grid 202 is less than 30 μm.

[0080] In actual implementation, the second auxiliary grid 202 is an N region auxiliary grid, and the line width of a conventional N region auxiliary grid is about 35 μm. Since the printing pattern corresponding to the second auxiliary grid 202 can avoid the screen joints, the printed second auxiliary grid 202 is not prone to have a broken grid, and thus the line width of the second auxiliary grid 202 can be reduced. In the embodiment of the present application, the second auxiliary grid 202 can be 5 μm to 6 μm smaller than the width of a conventional N region auxiliary grid, that is, the line width of the second auxiliary grid 202 can be less than 30 μm. Refining the second auxiliary grid 202 can increase the light receiving area and improve the conversion efficiency of the solar cell 101.

[0081] Figure 5 is a structural schematic diagram of a photovoltaic module provided by the embodiment of the present application. As shown in Figure 5 The present application also provides a photovoltaic module 100, which comprises the solar cell 101 in any of the above embodiments.

[0082] The solar cell 101 has been described in detail in the above embodiments, and thus will not be described here again.

[0083] The photovoltaic module provided by the embodiment of the present application is configured to avoid the screen joints on a printing screen, and among the plurality of auxiliary grids arranged on a silicon substrate, there are at least one group of auxiliary grids with unequal spacing between two adjacent auxiliary grids, and at least one auxiliary grid with unequal spacing between two adjacent auxiliary grids of the same polarity. Thus, by adjusting the spacing of the auxiliary grids, it is possible to reduce the possibility of the auxiliary grids coinciding with the screen joints, thereby reducing the problem of broken grids and improving the product yield of the solar cell 101.

[0084] Figure 6 is a structural schematic diagram of a photovoltaic system provided by the embodiment of the present application. As shown in Figure 6As shown, the present application also provides a photovoltaic system 200, comprising the photovoltaic module 100 in any of the above embodiments.

[0085] The photovoltaic module 100 has been described in the above embodiments, and will not be repeated here.

[0086] The photovoltaic system provided by the embodiments of the present application avoids the mesh knot on the printing screen, and the interval of the adjacent two sub-grids in at least one group of the plurality of sub-grids arranged on the silicon substrate is not equal, and the interval of the adjacent two sub-grids with the same polarity of at least one sub-grid is not equal, so that the interval of the sub-grid is adjusted, which helps to reduce the possibility of the sub-grid coinciding with the mesh knot, thereby reducing the problem of broken grid and improving the product yield of the solar cell 101.

[0087] Figure 7 Fig. 1 is a structural schematic diagram of a printing screen provided by the embodiments of the present application. As shown in the figure, Figure 7 The embodiments of the present application also provide a printing screen 300, comprising: a screen frame 3000, a screen cloth 3001 and a plurality of sub-grid corresponding printing patterns 3002, the screen cloth 3001 is fixed on the screen frame 3000, and the printing patterns 3002 are located on the screen cloth 3001; the screen cloth 3001 is interwoven by warp and weft, the warp and the weft intersect to form a plurality of mesh knots 3003; the printing patterns 3002 do not pass through the plurality of mesh knots 3003.

[0088] The material of the screen cloth 3001 can be nylon screen cloth, polyester screen cloth, stainless steel screen cloth, etc., which is not limited here. The weft in the screen cloth 3001 extends along a first direction, and the warp in the screen cloth 3001 extends along a second direction. All the warps in the screen cloth 3001 are parallel to each other and parallel to the two edges of the screen frame 3000 in the first direction, and all the wefts in the screen cloth 3001 are parallel to each other and parallel to the two edges of the screen frame 3000 in the second direction. It can be understood that, Figure 7 Only the screen cloth 3001 in part of the printing screen is shown in the figure, which does not represent a limitation on the form of the screen cloth 3001.

[0089] In actual execution, the screen cloth 3001 is interwoven by warp and weft to form a grid shape, and each grid corresponds to a mesh hole.

[0090] As shown in the figure, Figure 7 The opening position corresponding to the printing pattern 3002 is located between the adjacent two wefts, i.e. between the adjacent two mesh knots in the first direction, so that the area where the printing pattern 3002 is located is an area without contact with the mesh knot.

[0091] The printing screen plate provided by the embodiment of the present application can avoid the screen knot, reduce the occurrence of broken screen, improve the printing effect of the secondary screen, help to further refine the line width of the secondary screen, and further improve the photoelectric conversion efficiency of the solar cell 101.

[0092] It can be understood that those skilled in the art can combine various embodiments in the above embodiments under the guidance of the above embodiments to obtain various embodiments of the technical solutions.

[0093] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solar cell, characterized by, The application relates to a solar cell, comprising: a silicon substrate and a plurality of sub-gates, the plurality of sub-gates including two sub-gates with different polarities; the plurality of sub-gates are arranged on the silicon substrate and extend along a first direction, the two sub-gates with different polarities are arranged alternately along a second direction, and the first direction intersects the second direction; in the plurality of sub-gates, a first sub-gate has unequal intervals with a second sub-gate and a third sub-gate, the second sub-gate and the third sub-gate are adjacent to the first sub-gate and have different polarities from the first sub-gate; in the sub-gates with the same polarity as the first sub-gate, the first sub-gate has unequal intervals with a fourth sub-gate and a fifth sub-gate, the fourth sub-gate and the fifth sub-gate are adjacent to the first sub-gate.

2. The solar cell according to claim 1, characterized in that, The intervals of two adjacent sub-gates in the sub-gates with the same polarity are adjusted based on the mesh size of a printing screen corresponding to the sub-gates with the same polarity.

3. The solar cell according to claim 2, characterized in that The mesh size is A mu m, and the initial interval of two adjacent sub-gates in the sub-gates with the same polarity is B mm. In the case that the two adjacent sub-gates in the sub-gates with the same polarity include a target sub-gate, the interval of the two adjacent sub-gates in the sub-gates with the same polarity is adjusted to be greater than (B-A) mm and less than (B+A) mm, and the target sub-gate is a sub-gate corresponding to a printing pattern of the plurality of sub-gates and contacting a mesh point of the printing screen.

4. The solar cell according to claim 3, characterized in that, The mesh size is 40 mu m to 50 mu m.

5. The solar cell according to claim 3, wherein The initial interval of the two adjacent sub-gates in the sub-gates with the same polarity is 0.9 mm to 1.1 mm.

6. The solar cell of claim 1, wherein The line width of the first sub-gate is less than 33 mu m.

7. The solar cell of claim 1, wherein The line width of the second sub-gate is less than 30 mu m.

8. A photovoltaic module, characterized by The application relates to a solar cell, comprising: The solar cell of any one of claims 1-7.

9. A photovoltaic system characterized by, The application relates to a photovoltaic module, comprising: The photovoltaic module of claim 8.

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