Photovoltaic cell printing screen without main grid

Abstract

The utility model discloses a main-grid-free photovoltaic cell printing screen, which is applied to the field of photovoltaic cell preparation, and is characterized in that a plurality of fine grid line hollow parts which are arranged at intervals along a first direction are arranged in the printing screen; the first end edge and the second end edge of the printing screen plate in the first direction are each provided with a plurality of hollowed-out part setting areas comprising hollowed-out parts connected with grid lines. The number of the connecting grid line hollow-out parts arranged in each hollow-out part arrangement area at the edge of the first end is larger than the number of the connecting grid line hollow-out parts arranged in the corresponding hollow-out part arrangement area at the edge of the second end. According to the utility model, the number of the connecting grid line hollow parts at the edge of the first end is greater than the number of the corresponding connecting grid line hollow parts at the edge of the second end, so that the problem of poor current leading-out effect at the edge of the battery can be solved while the lower preparation cost is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic cell preparation field especially relates to a main gridless photovoltaic cell printing screen plate. BACKGROUND

[0002] The existing 0BB (main gridless) photovoltaic cell completely removes the main grid, reduces the use of metal electrode, reduces the light shielding area of the light receiving surface of the cell, improves the photoelectric conversion efficiency of the photovoltaic cell, and simultaneously reduces the amount of silver paste at the photovoltaic cell. The existing main gridless photovoltaic cell sets a hollow pattern in the cell printing screen plate, and uses the hollow pattern to prepare a grid line electrode with a corresponding pattern shape. However, in the existing main gridless photovoltaic cell, the solder strip replaces the main grid to collect the photo-generated current collected by the auxiliary grid, but the existing solder strip and adhesive film have a distance of 2 to 4 millimeters from the edge of the cell, or the adhesive film at the edge is not firmly fixed to the solder strip, resulting in poor conductivity of the edge area of the photovoltaic cell.

[0003] Therefore, at the edge of the main gridless cell, how to provide a cell printing screen plate that can collect the photo-generated current collected by the grid line is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the utility model discloses a main gridless photovoltaic cell printing screen plate, which solves the problem of poor conductivity of the conductive grid line prepared by the cell printing screen plate in the edge area of the photovoltaic cell in the prior art.

[0005] To solve the above technical problems, the utility model provides a main gridless photovoltaic cell printing screen plate, which is provided with a plurality of fine grid line hollow parts arranged at intervals along a first direction in the printing screen plate, and the fine grid line hollow parts extend along a second direction intersecting the first direction.

[0006] The first end edge of the printing screen plate along the first direction and the second end edge of the printing screen plate along the first direction are both provided with a plurality of hollow part setting areas.

[0007] Each of the hollow part setting areas is provided with a connection grid line hollow part connected to a plurality of the fine grid line hollow parts.

[0008] The number of connection grid line hollow parts provided in each of the hollow part setting areas at the first end edge is greater than the number of connection grid line hollow parts provided in the corresponding hollow part setting area at the second end edge.

[0009] The plurality of connection grid line hollow parts provided in the same hollow part setting area are arranged side by side.

[0010] Optionally, at the first end edge, two connection grid line hollows are arranged in each hollow setting area;

[0011] At the second end edge, one connection grid line hollow is arranged in each hollow setting area.

[0012] Optionally, at the first end edge, the interval between the two connection grid line hollows arranged in each hollow setting area is 0.2-1 mm.

[0013] Optionally, at the first end edge, at least the outermost fine grid line hollow is interrupted between the two connection grid line hollows arranged in each hollow setting area.

[0014] Optionally, the extension length of the connection grid line hollow is 1.5-15 mm.

[0015] Optionally, at the intersection of the fine grid line hollow and the connection grid line hollow, a thickened grid line sub-hollow with a width gradually changing along the second direction is arranged.

[0016] Optionally, along the first direction, the length of the thickened grid line sub-hollow towards the outside is greater than the length of the thickened grid line sub-hollow towards the inside.

[0017] Optionally, the extension length of the thickened grid line sub-hollow along the second direction is 0.5-2 mm.

[0018] The utility model also provides a main grid-free photovoltaic cell whole piece printing screen plate for preparing conductive grid lines on the whole piece cell piece before slicing;

[0019] The whole piece printing screen plate is provided with a plurality of fine grid line hollows arranged at intervals along a first direction, and the fine grid line hollows extend along a second direction intersecting the first direction;

[0020] The whole piece printing screen plate is provided with a plurality of hollow setting areas at a first end edge, a second end edge along the first direction, and an intermediate area between the first end edge and the second end edge;

[0021] Each hollow setting area is provided with a connection grid line hollow connected with a plurality of fine grid line hollows;

[0022] At the first end edge and the second end edge, the number of connection grid line hollows arranged in each hollow setting area is greater than the number of connection grid line hollows arranged in the corresponding hollow setting area in the intermediate area.

[0023] The plurality of connection grid line hollow parts arranged in the same hollow part arrangement region are arranged side by side.

[0024] Optionally, at the middle region, the length of the connection grid line hollow part arranged in each hollow part arrangement region is twice the length of the connection grid line hollow part arranged in the corresponding hollow part arrangement region at the first end edge and the second end edge.

[0025] It can be seen that the printing screen provided by the utility model has the following advantages: the printing screen is provided with a plurality of fine grid line hollow parts arranged at intervals along a first direction, and the fine grid line hollow parts extend along a second direction intersecting the first direction; the printing screen is provided with a plurality of hollow part arrangement regions at a first end edge of the printing screen along the first direction and a second end edge of the printing screen along the first direction; each hollow part arrangement region is provided with a connection grid line hollow part connected to the plurality of fine grid line hollow parts; at the first end edge, the number of connection grid line hollow parts arranged in each hollow part arrangement region is greater than the number of connection grid line hollow parts arranged in the corresponding hollow part arrangement region at the second end edge; and the plurality of connection grid line hollow parts arranged in the same hollow part arrangement region are arranged side by side. The utility model has the following advantages: the printing screen is provided with a plurality of hollow part arrangement regions at the first end edge and the second end edge of the printing screen along the first direction, and each hollow part arrangement region is provided with a connection grid line hollow part connected to the plurality of fine grid line hollow parts, so that, when the fine grid line at the edge of the cell piece is disconnected from the solder strip, the photo-generated current collected by the disconnected fine grid line is transmitted to other fine grid lines through the connection grid line, and then transmitted to the solder strip, thereby ensuring the conductivity of the cell. When a plurality of cell pieces are combined to form a cell string, the side surface of a target cell piece is connected to the corresponding surface of an adjacent cell piece through the solder strip, so that the surface of the target cell piece is closer to one end of the adjacent cell piece, and the connection stability of the other end of the surface of the target cell piece is better. Therefore, at the first end edge, the number of connection grid line hollow parts arranged in each hollow part arrangement region is greater than the number of connection grid line hollow parts arranged in the corresponding hollow part arrangement region at the second end edge, so that the current discharge effect of the conductive grid line prepared by using the printing screen is stable at the edge of the cell while ensuring a low preparation cost.

[0026] In addition, the utility model also provides a whole piece printing screen for main grid-free photovoltaic cells, which also has the above-mentioned advantages. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are only part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0028] Figure 1 A structure schematic diagram of a printing screen plate of a main grid-free photovoltaic cell provided by the embodiment of the present application is shown in the figure.

[0029] Figure 2 A local enlarged schematic diagram of a connection grid line hollow part in a printing screen plate of a main grid-free photovoltaic cell provided by the embodiment of the present application is shown in the figure.

[0030] Figure 3 A local enlarged schematic diagram of a connection grid line hollow part in another printing screen plate of a main grid-free photovoltaic cell provided by the embodiment of the present application is shown in the figure.

[0031] Figure 4 A structure schematic diagram of a whole printing screen plate of a main grid-free photovoltaic cell provided by the embodiment of the present application is shown in the figure.

[0032] Figures 1 to 4 In the figures, the following signs are explained:

[0033] 10-printing screen plate, 11-first end edge, 12-second end edge, 20-fine grid line hollow part, 21-thickened grid line sub-hollow part, 30-connection grid line hollow part, 40-whole printing screen plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the figures in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0035] Embodiment 1:

[0036] Please refer to Figure 1 , Figure 1 A structure schematic diagram of a printing screen plate of a main grid-free photovoltaic cell provided by the embodiment of the present application is shown in the figure. The printing screen plate of the main grid-free photovoltaic cell is provided with a plurality of fine grid line hollow parts 20 arranged at intervals along a first direction, and the fine grid line hollow parts 20 extend along a second direction intersecting the first direction.

[0037] The printing screen 10 is provided with a plurality of hollow part setting areas at the first end edge 11 along the first direction and at the second end edge 12 along the first direction.

[0038] Each of the hollow part setting areas is provided with a connecting grid line hollow part 30 connected with the plurality of fine grid line hollow parts 20.

[0039] The number of the connecting grid line hollow parts 30 provided in each of the hollow part setting areas at the first end edge 11 is greater than the number of the connecting grid line hollow parts 30 provided in the corresponding hollow part setting area at the second end edge 12.

[0040] The plurality of connecting grid line hollow parts 30 provided in the same hollow part setting area are arranged side by side.

[0041] It should be noted that the two adjacent battery pieces in the battery string are taken as an example for illustration, one of the battery pieces is taken as the first battery piece, and the other adjacent battery piece is taken as the second battery piece. At this time, the solder strip laid on the front surface of the first battery piece extends from the end of the first battery piece close to the second battery piece, and extends to the back surface of the second battery piece through the gap between the first battery piece and the second battery piece, so as to realize the connection of the first battery piece and the second battery piece. At this time, since the starting end of the solder strip is away from the edge of the first battery piece, the solder strip cannot collect the current collected by the conductive grid line at the edge of the first battery piece. At the end of the first battery piece close to the second battery piece, the solder strip is disconnected at the edge of the first battery piece, and cannot effectively collect the current collected by the conductive grid line at the edge of the first battery piece close to the second battery piece. In addition, the conductive effect of the first battery piece at the end away from the second battery piece is worse than that at the end close to the second battery piece. Therefore, in the embodiment, the number of the connecting grid line hollow parts 30 provided in each of the hollow part setting areas at the first end edge 11 is greater than the number of the connecting grid line hollow parts 30 provided in the corresponding hollow part setting area at the second end edge 12, so as to improve the improvement rate of the conductive effect of the edge-out conductive grid line when the preparation cost is limited. In the embodiment, the main grid photovoltaic cell printing screen is prepared only on one side surface of the battery piece at a time. In the embodiment, the fine grid line hollow parts 20 are arranged in parallel, that is, the first direction of the interval arrangement of the fine grid line hollow parts 20 is perpendicular to the second direction of the extension of the fine grid line hollow parts 20. In the embodiment, the printing screen 10 along the first direction includes a middle region and an edge region. In the embodiment, the connecting grid line hollow part 30 is arranged in the edge region, and the plurality of fine grid line hollow parts 20 in the edge region are connected. In the embodiment, the connecting grid line hollow part 30 provided in the hollow part setting area at the first end edge 11 of the printing screen 10 can be referred to Figure 2 .Figure 2 A partial enlarged view of the connection of the grid line hollow part in the printing screen plate for the main grid-free photovoltaic cell is provided in the embodiment of the utility model, and the connection grid line hollow part 30 arranged in the hollow part setting area at the second end edge 12 of the printing screen plate 10 can be referred to Figure 3 , Figure 3 Another partial enlarged view of the connection of the grid line hollow part in the printing screen plate for the main grid-free photovoltaic cell is provided in the embodiment of the utility model.

[0042] In the embodiment, the specific number of the hollow part setting areas arranged respectively at the first end edge 11 and the second end edge 12 of the printing screen plate 10 in the first direction is not limited, and the number of the solder strips to be laid in the cell prepared by using the printing screen plate 10 can be arranged, that is, one hollow part setting area is arranged respectively at the first end edge 11 and the second end edge 12 corresponding to the position of the solder strip laid in the cell. Correspondingly, the number of the connection grid line hollow part 30 arranged in each hollow part setting area is not limited in the embodiment, and it should be noted that the plurality of connection grid line hollow parts 30 arranged in the same hollow part setting area are arranged side by side, and the connection grid line hollow part 30 in the same hollow part setting area can be arranged to be parallel to each other and to extend in the first direction. In order to improve the stability of the edge conductive grid line, the number of the connection grid line hollow part 30 arranged in the same hollow part setting area needs to be increased, and if the preparation cost of the conductive grid line needs to be ensured at the same time, the number of the connection grid line hollow part 30 arranged in the same hollow part setting area needs to be avoided. The specific extension direction of the connection grid line hollow part 30 is not limited in the embodiment, as long as it can connect the plurality of fine grid line hollow parts 20. For example, the connection grid line hollow part 30 can be arranged to extend in the first direction, that is, the connection grid line hollow part 30 is perpendicular to the fine grid line hollow part 20, or the connection grid line hollow part 30 can only intersect with the plurality of fine grid line hollow parts 20. In order to further reduce the material consumption when the connection grid line hollow part 30 is arranged, the connection grid line hollow part 30 can be arranged to be perpendicular to the fine grid line hollow part 20. The printing screen plate 10 prepared in the embodiment can simultaneously prepare the fine grid line hollow part 20 and the connection grid line hollow part 30, and the same high-purity silver paste can be used.

[0043] Further, in order to ensure that the problem of poor edge conductivity of the prepared conductive grid line is improved, the extension length of the above-mentioned connection grid line hollow part 30 can be set to 1.5 mm to 15 mm.

[0044] The extension length of the connection grid line hollow part 30 in the embodiment is set to 1.5-15 mm, which can ensure that the conductive grid line at the edge is prepared through the connection grid line hollow part 30, improve the conductive effect, and further avoid the problem that the photo-generated current collected by the fine grid line prepared by using the fine grid line hollow part 20 cannot be transmitted into the solder ribbon. The width of the connection grid line hollow part 30 in the embodiment can be set to 0.015-0.055 mm.

[0045] Further, in order to avoid the disconnection of the grid line at the intersection of the fine grid line prepared by using the above-mentioned printing screen 10 and the connection grid line, a thickened grid line sub-hollow part 21 with a width gradually changing in the second direction can be arranged at the intersection position of the fine grid line hollow part 20 and the connection grid line hollow part 30.

[0046] It should be noted that in the embodiment, the intersection position of the fine grid line hollow part 20 and the connection grid line hollow part 30 is provided with the thickened grid line sub-hollow part 21 with a width gradually changing in the second direction. Specifically, in the embodiment, the width of the fine grid line hollow part 20 gradually decreases in the second direction away from the connection grid line hollow part 30 until it decreases to the width value of the non-thickened part of the fine grid line hollow part 20. The width of the thickened grid line sub-hollow part 21 in the first direction in the embodiment can be set to 0.025-0.055 mm.

[0047] Further, in order to avoid the disconnection of the thickened sub-grid line prepared by using the above-mentioned printing screen 10 and the solder ribbon during installation, due to the offset of the solder ribbon to the non-thickened area of the prepared fine grid line, the length of the thickened grid line sub-hollow part 21 on the outer side in the first direction can be set to be greater than the length of the thickened grid line sub-hollow part 21 on the inner side.

[0048] It should be noted that the structure of the thickened sub-grid line in the embodiment is specifically prepared by the thickened grid line sub-hollow part 21. The thickened grid line sub-hollow part 21 arranged at the intersection position of the fine grid line hollow part 20 and the connection grid line hollow part 30 in the printing screen 10 in the embodiment can also avoid the disconnection of the solder ribbon and the prepared fine grid line during welding. In the embodiment, the length of the thickened grid line sub-hollow part 21 arranged at the outer side of the fine grid line hollow part 20 in the direction of the interval arrangement is set to be greater than the length of the thickened grid line sub-hollow part 21 arranged at the inner side of the fine grid line hollow part 20 in the second direction. When the solder ribbon is offset, although the solder ribbon near the edge deviates greatly, the solder ribbon can still be laid on the thickened sub-grid line, which reduces the risk of disconnection of the solder ribbon and the fine grid line at the welding position while ensuring the cost of grid line preparation.

[0049] Further, in order to ensure the stability of the connection between the solder strip and the fine grid line during subsequent laying of the solder strip, the extension length of the thickened grid line sub-hollow part 21 in the second direction is 0.5-2 mm.

[0050] In the embodiment, the extension length of the thickened grid line sub-hollow part 21 in the second direction is 0.5-2 mm, i.e., the extension length of the prepared thickened sub-grid line is 0.5-2 mm, which can ensure the stability of the connection between the solder strip and the fine grid line and avoid grid breakage.

[0051] The printing screen plate 10 is provided with a plurality of fine grid line hollow parts 20 arranged at intervals in the first direction, and the fine grid line hollow parts 20 extend in the second direction intersecting the first direction; the first end edge 11 of the printing screen plate 10 in the first direction and the second end edge 12 of the printing screen plate 10 in the first direction are each provided with a plurality of hollow part setting areas; each hollow part setting area is provided with a plurality of connection grid line hollow parts 30 connected to the plurality of fine grid line hollow parts 20; the number of connection grid line hollow parts 30 provided in each hollow part setting area at the first end edge 11 is greater than the number of connection grid line hollow parts 30 provided in the corresponding hollow part setting area at the second end edge 12; and the plurality of connection grid line hollow parts 30 provided in the same hollow part setting area are arranged side by side. The first end edge 11 and the second end edge 12 of the printing screen plate 10 in the first direction are each provided with a plurality of hollow part setting areas, and each hollow part setting area is provided with a plurality of connection grid line hollow parts 30 connected to the plurality of fine grid line hollow parts 20. The connection grid line prepared by using the connection grid line hollow parts 30 in the screen plate can realize the transmission of the photo-generated current collected by the fine grid line at the edge of the cell to other fine grid lines through the connection grid line when the fine grid line at the edge of the cell is disconnected from the solder strip, and then to the solder strip, thereby ensuring the conductivity efficiency of the cell. When a plurality of cell pieces are combined to form a cell string, the side surface of a target cell piece is connected to the corresponding surface of an adjacent cell piece through the solder strip, and the end of the target cell piece close to the adjacent cell piece has better connection stability than the other end of the side surface of the target cell piece. Therefore, the number of connection grid line hollow parts 30 provided in each hollow part setting area at the first end edge 11 is greater than the number of connection grid line hollow parts 30 provided in the corresponding hollow part setting area at the second end edge 12, which can ensure stable current conduction effect at the edge of the cell while ensuring low preparation cost.

[0052] Furthermore, the extension length of the connecting grid line hollow part 30 is 1.5-15 mm, which can ensure that the conductive grid line is at the edge, the connecting grid line prepared by the connecting grid line hollow part 30 improves the conductive effect, and further avoids the problem that the photo-generated current collected by the fine grid line prepared by the fine grid line hollow part 20 cannot be transmitted to the solder strip; the thickened grid line sub-hollow part 21 with a width gradually changing along the second direction is arranged at the intersection position of the fine grid line hollow part 20 and the connecting grid line hollow part 30, which can avoid the broken grid at the intersection of the fine grid line and the connecting grid line prepared by the printing screen 10; the length of the thickened grid line sub-hollow part 21 towards the outside along the first direction is greater than the length of the thickened grid line sub-hollow part 21 towards the inside, which reduces the risk of broken grid at the soldering position of the solder strip and the fine grid line while ensuring the preparation cost of the grid line; the extension length of the thickened grid line sub-hollow part 21 along the second direction is 0.5-2 mm, which can ensure the stability of the connection between the solder strip and the fine grid line and further avoid the problem of broken grid.

[0053] Embodiment 2:

[0054] Please refer to Figure 1 , Figure 1 The structure diagram of the printing screen of the main grid-free photovoltaic cell provided in the embodiment of the present application. Compared with the printing screen 10 in Embodiment 1, the difference lies in that:

[0055] Two connecting grid line hollow parts 30 are arranged in each hollow part setting area at the first end edge 11;

[0056] One connecting grid line hollow part 30 is arranged in each hollow part setting area at the second end edge 12.

[0057] It should be noted that two connecting grid line hollow parts 30 are arranged at the first end edge 11, i.e., the starting end or the terminal end when the solder strip is laid, which can ensure that the conductive grid line prepared by the printing screen 10 is stable at the starting or terminal position of the solder strip, and one connecting grid line hollow part 30 is arranged at the second end edge 12, i.e., the middle area solder strip between the adjacent cell pieces when the solder strip is laid, which can improve the conductive effect of the conductive grid line at the edge area while ensuring the preparation cost. In the embodiment, the conductive grid line prepared by the printing screen 10 can increase the amount of paste used in the area where the fine grid line and the solder strip are prone to be disconnected under the premise of limited preparation material, thereby improving the effective utilization rate of the connecting grid line hollow part 30, reducing the preparation cost, and further improving the poor conductive effect of the conductive grid line at the edge.

[0058] Further, in order to ensure that the connection grid lines prepared by the connection grid line hollowing part 30 can effectively improve the conductive connection efficiency at the edge of the conductive grid line, avoid the resistance of the disconnected thin grid line and the solder strip being too large to affect the efficiency of current collection, the interval between the two connection grid line hollowing parts 30 set in each hollowing part setting area can be 0.2-1 mm.

[0059] In the embodiment, the interval between the two connection grid line hollowing parts 30 is 0.2-1 mm, which can realize the nearby connection of the disconnected thin grid line to the adjacent thin grid line and the connection of the adjacent thin grid line to the solder strip, reduce the change of the original thin grid line and the solder strip connection path, and improve the preparation simplicity of the connection grid line hollowing part 30. In the embodiment, the contact surface of the solder strip and the battery piece during welding is not limited, but it should be noted that when the interval between the two connection grid line hollowing parts 30 is 0.2 mm, i.e., the interval between the two connection grid lines is 0.2 mm, and the width of the contact surface of the solder strip and the battery piece formed in the second direction reaches 0.2 mm, the solder strip can cover the two connection grid lines prepared by the connection grid line hollowing part 30 at the same time, which can improve the conductivity of the solder strip and the grid line connection under the premise that the grid line is not damaged during welding.

[0060] Further, in order to reduce the stress during the welding of the solder strip and the battery piece, the at least outermost thin grid line hollowing part 20 can be interrupted between the two connection grid line hollowing parts 30 set in each hollowing part setting area at the first end edge 11.

[0061] It should be noted that in the embodiment, the two connection grid line hollowing parts 30 are set at the first end edge 11, and the at least outermost thin grid line hollowing part 20 is interrupted between the two connection grid line hollowing parts 30, i.e., the thin grid line prepared by the outermost thin grid line hollowing part 20 has no contact with the solder strip, which can reduce the stress during the welding of the solder strip and the battery piece and improve the stability of the solder strip welding. The embodiment does not limit the specific number of the interrupted thin grid line hollowing parts 20 between the two connection grid line hollowing parts 30 set at the first end edge 11. For example, two thin grid line hollowing parts 20 can be interrupted between the two connection grid line hollowing parts 30 from the outermost thin grid line hollowing part 20, or three thin grid line hollowing parts 20 can be interrupted between the two connection grid line hollowing parts 30.

[0062] The printed screen provided by the embodiment of the utility model can ensure the stability of the prepared conductive grid line in the start or end position of the solder strip, while only one connecting grid line hollow part 30 is arranged at the second end edge 12, which corresponds to the middle area solder strip arranged between the adjacent cell pieces during the laying of the solder strip, thereby realizing the improvement of the conductive effect of the conductive grid line in the edge area while ensuring the preparation cost.

[0063] In addition, the interval between the two connecting grid line hollow parts 30 is 0.2-1 mm, which can realize the nearby connection of the thin grid line to the adjacent thin grid line and the connection of the thin grid line to the solder strip through the adjacent thin grid line, thereby reducing the change of the original thin grid line and solder strip connection path and improving the simplicity of the preparation of the connecting grid line hollow part 30.

[0064] In a feasible embodiment, the above-mentioned printed screen for the main grid-free photovoltaic cell can specifically include the following structure:

[0065] The printed screen is provided with a plurality of thin grid line hollow parts arranged at intervals along a first direction, and the thin grid line hollow parts extend along a second direction intersecting the first direction;

[0066] The first end edge of the printed screen along the first direction and the second end edge of the printed screen along the first direction are both provided with a plurality of hollow part setting areas;

[0067] Each hollow part setting area is provided with a connecting grid line hollow part connected to the plurality of thin grid line hollow parts;

[0068] At the first end edge, two connecting grid line hollow parts are arranged in each hollow part setting area; at the second end edge, one connecting grid line hollow part is arranged in each hollow part setting area;

[0069] The plurality of connecting grid line hollow parts arranged in the same hollow part setting area are arranged side by side;

[0070] At the first end edge, the interval between the two connecting grid line hollow parts arranged in each hollow part setting area is 0.2-1 mm; at the first end edge, at least the outermost thin grid line hollow part is interrupted between the two connecting grid line hollow parts arranged in each hollow part setting area;

[0071] The extension length of the connection grid line hollow part is 1.5mm to 15mm;

[0072] The intersection position of the fine grid line hollow part and the connection grid line hollow part is provided with a thickened grid line sub-hollow part with a width gradually changing along the second direction; along the first direction, the length of the thickened grid line sub-hollow part towards the outer side is greater than the length of the thickened grid line sub-hollow part towards the inner side; the extension length of the thickened grid line sub-hollow part along the second direction is 0.5mm to 2mm.

[0073] The following describes a whole-piece printing screen for a main-grid-free photovoltaic cell according to an embodiment of the present application, and the whole-piece printing screen for a main-grid-free photovoltaic cell described below can be mutually corresponding to the main-grid-free photovoltaic cell printing screen described above.

[0074] For details, please refer to Figure 4 , Figure 4 FIG. 1 is a structure schematic diagram of a whole-piece printing screen for a main-grid-free photovoltaic cell according to an embodiment of the present application. The whole-piece printing screen for a main-grid-free photovoltaic cell is used to prepare conductive grid lines on a whole-piece cell before slicing;

[0075] The whole-piece printing screen 40 is provided with a plurality of fine grid line hollow parts arranged at intervals along the first direction, and the fine grid line hollow part extends along the second direction intersecting the first direction;

[0076] The whole-piece printing screen 40 is provided with a plurality of hollow part setting areas at the first end edge, the second end edge along the first direction, and the middle area between the first end edge and the second end edge;

[0077] Each hollow part setting area is provided with a connection grid line hollow part connected with the plurality of fine grid line hollow parts;

[0078] The number of connection grid line hollow parts provided in each hollow part setting area at the first end edge and the second end edge is greater than the number of connection grid line hollow parts provided in the corresponding hollow part setting area at the middle area;

[0079] The plurality of connection grid line hollow parts provided in the same hollow part setting area are arranged side by side.

[0080] It needs to be noted that in the embodiment, the hollow part setting area is arranged at the first end edge, the second end edge and the middle region between the first end edge and the second end edge of the whole piece of printed screen 40. It needs to be noted that the hollow part setting area arranged at the middle region between the first end edge and the second end edge is a structure for preparing the connection grid lines in the middle region of the whole piece of battery piece surface. Specifically, after the grid lines of the whole piece of battery piece surface are prepared, the whole piece of battery piece is cut to obtain two half pieces of battery piece, and the connection grid lines prepared in the middle region of the whole piece of battery piece correspond to the connection grid lines at the edges of the two half pieces of battery piece, respectively. That is, the whole piece of printed screen for the main grid-free photovoltaic cell in the embodiment is used to prepare the grid lines on the surface of the whole piece of battery piece which needs to be cut later. Further, the whole piece of battery piece prepared in the embodiment can be cut into any number of half pieces of battery piece later, and the number of the connection grid line hollow parts arranged in the whole piece of printed screen 40 needs to be adjusted according to the number of the cut pieces, and only the half piece of battery piece obtained finally needs to be the same as the battery piece prepared by using the above-mentioned printed screen for the main grid-free photovoltaic cell.

[0081] Further, in order to ensure the convenience of cutting the whole piece of battery piece prepared by using the whole piece of printed screen 40, the length of the connection grid line hollow part arranged in each hollow part setting area in the middle region is twice the length of the connection grid line hollow part arranged in the corresponding hollow part setting area at the first end edge and the second end edge.

[0082] It needs to be noted that in the embodiment, the length of the connection grid line hollow part arranged in each hollow part setting area in the middle region is twice the length of the connection grid line hollow part arranged at the first end edge and the second end edge, and when the whole piece of battery piece is cut later, the whole piece of battery piece is divided into two parts according to the connection grid line arranged in the middle region, so that the extension length of the connection grid line arranged in the middle region on each battery piece after cutting is the same as the extension length of the connection grid line arranged at the first end edge and the second end edge.

[0083] The whole piece printing screen plate 40 is used for preparing conductive grid lines on the whole piece cell before slicing, the whole piece printing screen plate 40 is provided with a plurality of fine grid line hollow parts arranged at intervals along a first direction, the fine grid line hollow parts extend along a second direction intersecting the first direction, the whole piece printing screen plate 40 is provided with a plurality of hollow part setting areas at a first end edge, a second end edge along the first direction and a middle region between the first end edge and the second end edge, the hollow part setting areas are provided with a plurality of connecting grid line hollow parts connected with the plurality of fine grid line hollow parts, the number of the connecting grid line hollow parts provided in each hollow part setting area at the first end edge and the second end edge is greater than that in the middle region, and the plurality of connecting grid line hollow parts provided in the same hollow part setting area are arranged side by side.

[0084] In addition, the length of the connecting grid line hollow part provided in each hollow part setting area at the middle region is twice the length of the connecting grid line hollow part provided at the first end edge and the second end edge, so that the whole piece cell prepared by using the whole piece printing screen plate 40 is convenient for slicing.

[0085] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other.

[0086] In addition, it also needs to be explained that, in this paper, the relationship such as first and second belongs to distinguish one entity or operation from another entity or operation, and does not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant is intended to cover non-exclusive inclusion.

[0087] The above has carried out the detailed introduction to the printing screen plate of the main grid-free photovoltaic cell provided by the utility model, the principle and implementation mode of the utility model have been described in this paper by applying specific examples, the above embodiment is only used for helping understanding the structure of the utility model and its core idea; simultaneously, for the general technical personnel in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range, and the above is described, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A masterless grid photovoltaic cell printing screen, characterized by, The printing screen is provided with a plurality of fine grid line hollow parts arranged at intervals along a first direction, and the fine grid line hollow parts extend along a second direction intersecting the first direction; The printing screen is provided with a plurality of hollow part setting areas at a first end edge along the first direction and a second end edge along the first direction; Each of the hollow part setting areas is provided with a connecting grid line hollow part connected to a plurality of the fine grid line hollow parts; The number of connecting grid line hollow parts provided in each of the hollow part setting areas at the first end edge is greater than the number of connecting grid line hollow parts provided in the corresponding hollow part setting area at the second end edge; The plurality of connecting grid line hollow parts provided in the same hollow part setting area are arranged side by side.

2. The printed screen for a gridless photovoltaic cell according to claim 1, wherein Two connecting grid line hollow parts are provided in each of the hollow part setting areas at the first end edge; One connecting grid line hollow part is provided in each of the hollow part setting areas at the second end edge.

3. The printed screen for a gridless photovoltaic cell of claim 2, wherein, The spacing between the two connecting grid line hollow parts provided in each of the hollow part setting areas at the first end edge is 0.2-1 mm.

4. The printed screen for a gridless photovoltaic cell of claim 2, wherein, At least the outermost fine grid line hollow part is interrupted between the two connecting grid line hollow parts provided in each of the hollow part setting areas at the first end edge.

5. The printed screen for a gridless photovoltaic cell of claim 1, wherein, The extension length of the connecting grid line hollow part is 1.5-15 mm.

6. The printed screen for a gridless photovoltaic cell of claim 1, wherein, A thickened grid line sub-hollow part with a width gradually changing along the second direction is arranged at the intersection position of the fine grid line hollow part and the connecting grid line hollow part.

7. The printed screen for a gridless photovoltaic cell of claim 6, wherein, Along the first direction, the length of the thickened grid line sub-hollow part towards the outside is greater than the length of the thickened grid line sub-hollow part towards the inside.

8. The printed screen for a gridless photovoltaic cell of claim 6, wherein, The extension length of the thickened grid line sub-hollow part along the second direction is 0.5-2 mm.

9. A master gridless photovoltaic cell flatbed printing screen, characterized by, A method for preparing conductive grid lines on a whole battery piece before slicing; The whole printing screen is provided with a plurality of fine grid line hollow parts arranged at intervals along a first direction, and the fine grid line hollow parts extend along a second direction intersecting the first direction; The whole printing screen is provided with a plurality of hollow part setting areas at a first end edge along the first direction, a second end edge along the first direction, and an intermediate region between the first end edge and the second end edge; Each of the hollow part setting areas is provided with a connecting grid line hollow part connected to a plurality of the fine grid line hollow parts; The number of connecting grid line hollow parts provided in each of the hollow part setting areas at the first end edge and the second end edge is greater than the number of connecting grid line hollow parts provided in the corresponding hollow part setting area at the intermediate region; The plurality of connecting grid line hollow parts provided in the same hollow part setting area are arranged side by side.

10. The no-mast grid photovoltaic cell flat-panel printing screen plate according to claim 9, characterized in that, The length of the connecting grid line hollow part provided in each of the hollow part setting areas at the intermediate region is twice the length of the connecting grid line hollow part provided in the corresponding hollow part setting area at the first end edge and the second end edge.

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