Screen printing plate, screen printing plate assembly and solar cell
By setting raised and/or recessed compensation parts on the printing screen, the problems of reduced paste transmittance and deformation of printing grid lines caused by uneven battery substrate are solved, achieving higher printing quality and stability.
Patent Information
- Application Number
- CN202520427940.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-03-12
AI Technical Summary
When printing solar cells using conventional screen printing stencils, the uneven surface of the solar cell substrate leads to reduced ink transmittance and deformation of the printed grid lines.
Design a printing screen comprising a compensating portion with protrusions and/or depressions on the bearing surface to compensate for unevenness of the battery substrate, thereby improving the stability of the printing grid lines and the ink transmittance.
It improves printing quality, avoids deformation and breakage of printing grid lines, and enhances the applicability and printing quality of printing screens.
Smart Images
Figure CN223750451U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and in particular to a solar cell printing screen, a printing screen assembly, and a solar cell. Background Technology
[0002] Printing screens are an important tool for printing electrodes on solar cells. The printing screen is filled with paste, and a squeegee is used to move the paste on the screen, so that the paste is squeezed through the mesh of the printing screen onto the solar cell substrate, forming a corresponding pattern on the substrate to form the electrodes of the solar cell.
[0003] Conventional solar cells use a screen printing machine to print fine grid electrodes and main grid electrodes on the surface of the cell substrate. The fine grid electrodes collect the current generated after illumination, while the main grid electrodes collect the current from the fine grid electrode lines. The screen printing machine uses a fine grid screen to print the fine grid electrodes and a main grid screen to print the main grid electrodes. However, during printing, if the surface of the cell substrate is uneven, the movement of the squeegee carrying the ink across the screen can easily cause deformation of the mesh openings, thus affecting the ink's transmittance. Summary of the Invention
[0004] Therefore, it is necessary to provide a new printing screen, printing screen assembly, and solar cell to solve the aforementioned technical problems.
[0005] One technical solution of this utility model is: a printing screen, which includes a printing body and a plurality of printing grid lines disposed on the printing body. The printing body includes a printing surface and a bearing surface disposed opposite to each other. The plurality of printing grid lines are spaced apart and each of the printing surfaces extends through the bearing surface. The bearing surface has a compensation portion with protrusions and / or depressions.
[0006] In one embodiment, the compensation part includes a recessed structure recessed from the bearing surface, the depth of the recessed structure being in the range of 2μm-30μm.
[0007] In one embodiment, the printed grid lines extend along a first direction, and a plurality of the printed grid lines are arranged at intervals along a second direction intersecting the first direction. The recessed structure is in the form of a grid and extends along the first direction. The recessed structure is spaced apart from the printed grid lines, or the recessed structure is connected to the printed grid lines.
[0008] In one embodiment, the recessed structure extends continuously or intermittently along a first direction, and the width of a single recessed structure along a second direction is constant, gradually changing, regularly changing, or randomly changing.
[0009] In one of the embodiments, the recessed structures are arranged between the adjacent printed grid lines, and the widths of the recessed structures are the same or different.
[0010] In one of the embodiments, the compensation portion includes a protruding structure protruding from the bearing surface, and the thickness of the protruding structure ranges from 2 μm to 20 μm.
[0011] In one of the embodiments, the printed grid lines are arranged apart from the protruding structure, or the printed grid lines penetrate the protruding structure.
[0012] In one of the embodiments, the printed body includes a first layer and a second layer arranged in a stack, the bearing surface is arranged on the first layer, the printing surface is arranged on the second layer, and the compensation portion is arranged on the first layer.
[0013] In one of the embodiments, the first layer is a metal layer containing nickel, or the first layer is a polymer layer.
[0014] In one of the embodiments, the printed grid lines include a first grid line arranged through the first layer and a second grid line arranged through the second layer, and the width of the first grid line is smaller than the width of the second grid line.
[0015] In one of the embodiments, the printed body further includes a third layer between the first layer and the second layer, the printed grid lines include a third grid line arranged through the third layer, and the width of the third grid line is smaller than or equal to the width of the first grid line.
[0016] In one of the embodiments, the printing screen is a main screen or a fine screen.
[0017] The utility model also provides a printing screen assembly which comprises a first printing screen and a second printing screen used in cooperation, wherein the first printing screen is the printing screen as described above, the second printing screen is the printing screen as described above, and the compensation portion of the first printing screen and the compensation portion of the second printing screen are arranged at different positions.
[0018] In one of the embodiments, the arrangement position of the compensation portion of the first printing screen corresponds to the arrangement position of the printed grid line of the second printing screen, and the arrangement position of the printed grid line of the first printing screen corresponds to the arrangement position of the compensation portion of the second printing screen.
[0019] The utility model also provides a solar cell, characterized in that it comprises a cell substrate and a grid line electrode printed by the printing screen as described above or the printing screen assembly as described above.
[0020] In one embodiment, the solar cell is a BC cell, and the grid line electrode includes a main grid electrode, a first fine grid electrode, and a second fine grid electrode that is intersected with the first fine grid electrode.
[0021] The beneficial effects of this invention are as follows: The printing screen is equipped with raised or recessed compensation parts, which prevents deformation of the printing grid lines during printing due to the movement of the squeegee, thus avoiding impact on the ink transmittance. This enhances the applicability of the printing screen, improves printing quality, and avoids problems such as broken lines. Furthermore, this invention also provides a printing screen assembly and a solar cell, further improving printing quality, preventing broken lines, and increasing yield. Attached Figure Description
[0022] Figure 1 This is a planar schematic diagram of the printing screen of this utility model;
[0023] Figure 2 This is a schematic diagram of the structure of the printing screen of this utility model;
[0024] Figure 3 for Figure 2 Another structural diagram;
[0025] Figure 4 for Figure 2 Another structural diagram;
[0026] Figure 5 for Figure 2 Another structural diagram;
[0027] Figure 6 for Figure 2 Another structural diagram;
[0028] Figure 7 for Figure 2 Another structural diagram;
[0029] Figure 8 This is another planar schematic diagram of the printing screen of this utility model;
[0030] Figure 9 This is another planar schematic diagram of the printing screen of this utility model;
[0031] Figure 10 This is a schematic diagram of another structure of the printing screen of this utility model;
[0032] Figure 11 for Figure 10 Another structural diagram. Detailed Implementation
[0033] For the convenience of understanding the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described below. Rather, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0034] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for the purpose of illustration only and are not intended to limit the present application.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0036] The present application discloses a printing screen plate, which comprises a printing body and a plurality of printing lines arranged on the printing body, the printing body comprises a printing surface and a bearing surface arranged oppositely, the plurality of printing lines are distributed at intervals and each printing surface penetrates through the bearing surface, wherein the bearing surface is provided with a raised and / or recessed compensation part. The printing screen plate is provided with a raised or recessed compensation part, which can avoid the deformation of the printing lines caused by the movement of the scraper during printing, thereby affecting the transmittance of the paste. In this way, the printing screen plate has high applicability, improves the printing quality and avoids problems such as disconnection. When the printing screen plate is used to print the grid electrode on the uneven battery substrate, the raised and / or recessed compensation part can effectively compensate for the influence of unevenness on the printing screen plate, thereby improving the printing quality.
[0037] In one embodiment, the compensation part is arranged at an interval from the printing line and the interval distance is greater than or equal to 50 μm, so as to ensure the quality of the printing line and the overall strength of the printing screen plate and improve the printing quality.
[0038] In one embodiment, the compensation part comprises a recessed structure recessed from the bearing surface, and the depth of the recessed structure is greater than or equal to 1 μm. The recessed structure is recessed from the bearing surface but does not penetrate through the printing surface, and the recessed structure can correspond to the original protrusions or grid electrodes on the battery substrate from the solar cell substrate, maintain the planarity of the bearing surface, compensate for the influence of unevenness of the battery substrate on printing, and improve the printing quality.
[0039] In one embodiment, the printed grid lines extend along a first direction, and a plurality of printed grid lines are arranged at intervals along a second direction intersecting the first direction, the recessed structures are in the form of a grid and extend along the first direction, and the recessed structures are arranged at intervals from the printed grid lines or are in communication with the printed grid lines. The recessed structures extend continuously or discontinuously along the first direction, and the width of a single recessed structure along the second direction is constant, gradually changes, regularly changes, or randomly changes. Continuous extension includes linear extension or non-linear extension such as curved lines or broken lines. Discontinuous extension includes extension along the same line or staggered extension. The recessed structures are arranged between adjacent printed grid lines, and a plurality of recessed structures are arranged with the same or different widths. The structural stability of the printed grid lines is ensured, and the printing quality is improved.
[0040] In one embodiment, the compensation portion includes a raised structure protruding from the bearing surface, and the thickness of the raised structure is greater than or equal to 1 μm. The raised structure can correspond to the original recess on the cell substrate from the solar cell piece, maintain the planarity of the bearing surface, compensate for the influence of the unevenness of the cell substrate on printing, and improve the printing quality.
[0041] In one embodiment, the printed grid lines are arranged at intervals from the raised structures, or the printed grid lines penetrate the raised structures.
[0042] In one embodiment, the compensation portion includes recessed structures and raised structures, which correspond to the protrusions or recesses of the cell substrate, compensate for the influence of the unevenness of the cell substrate on printing, and improve the printing quality.
[0043] In one embodiment, the printing body includes a first layer and a second layer arranged in layers, the bearing surface is arranged on the first layer, the printing surface is arranged on the second layer, and the compensation portion is arranged on the first layer. The first layer is a metal layer containing nickel, or the first layer is a polymer layer. The printed grid lines include a first grid line penetrating the first layer and a second grid line penetrating the second layer, and the width of the first grid line is smaller than the width of the second grid line, which is beneficial to ink transfer and improves the printing quality.
[0044] In one embodiment, the printing body further includes a third layer between the first layer and the second layer, and the printed grid lines include a third grid line penetrating the third layer, and the width of the third grid line is smaller than or equal to or greater than the width of the first grid line, which is beneficial to ink transfer and improves the printing quality.
[0045] In one embodiment, the printing screen is a main screen or a fine screen.
[0046] The utility model discloses still disclose a kind of printing screen assembly, it includes the first printing screen as described above and the second printing screen as described above, wherein, the compensation portion of the first printing screen and the compensation portion of the second printing screen have different position settings, to increase applicability, improve printing quality.
[0047] In one embodiment, the setting position of the compensation part of the first printing screen corresponds to the setting position of the printing grid line of the second printing screen, and the setting position of the printing grid line of the first printing screen corresponds to the setting position of the compensation part of the second printing screen. The first printing screen is a fine grid screen, and the second printing screen is a fine grid screen.
[0048] The utility model discloses a solar cell piece, it includes cell base sheet and the grid line electrode that is printed by the printing screen or the printing screen assembly as described above as described above. The printing screen or the printing screen assembly is suitable for cell base sheet, improves the printing quality, improves the grid line electrode quality.
[0049] In one embodiment, the solar cell piece is a BC cell piece, the grid line electrode includes a main grid electrode, a first fine grid electrode arranged crossing the main grid electrode and a second fine grid electrode arranged crossing the main grid electrode, and a BC cell piece with high-quality grid line electrode is obtained. The first fine grid electrode and the second fine grid electrode can be formed by two printing screens in two times or by one printing screen in one time. The grid line electrode is not easy to break, has stable quality, and improves yield and conversion efficiency.
[0050] The following, please refer to Figures 1 to 8 , for example, the printing screen of the utility model is described.
[0051] Please refer to Figure 1 and Figure 2 The utility model discloses a printing screen 100, it includes printing body 1 and setting up at printing body 1 a plurality of printing grid line 2. Printing body 1 includes the printing face 11 and the bearing surface 12 of opposite setting. The bearing surface 12 has the recessed setting compensation part 3. The printing screen 100 is provided with recessed setting compensation part 3, when printing, the printing screen 100 can effectively fit, avoid the scraper movement and cause printing grid line 2 deformation and then influence the transmittance of slurry. In this way, the printing screen 100 has higher applicability, improves the printing quality, avoids the problem such as broken line. When the printing screen 100 prints the grid line electrode on the cell base sheet (not shown) with the convex, the recessed setting compensation part 3 can effectively compensate the influence of unevenness on the printing screen 100, and then improve the printing quality.
[0052] Further, the printing body 1 comprises a first layer body 13 and a second layer body 14 which are arranged in a stack. The bearing surface 12 is arranged on the first layer body 13, the printing surface 11 is arranged on the second layer body 14, and the recess structure 31 is arranged on the first layer body 13. The compensation part 3 is the recess structure 31 which is recessed from the bearing surface 12. The printing grid line 2 comprises a plurality of printing grid lines 2 which are arranged in a spaced manner along a second direction Y which is perpendicular to the first direction X, and the recess structure 31 is arranged adjacent to the printing grid line 2. The recess structure 31 is arranged between adjacent printing grid lines 2. The recess structure 31 is in the form of a line, and the length direction of the recess structure 31 extends along the first direction X. In the embodiment, the recess structure 31 continuously extends along the first direction X, and the width of the recess structure 31 along the second direction Y is constant. Each recess structure 31 has the same length, width and depth, i.e., each recess structure 31 has the same parameters. In other embodiments, the parameters of each recess structure 31 can be different or partially different. The printing grid line 2 comprises a first grid line 21 which is arranged through the first layer body 13 and a second grid line 22 which is arranged through the second layer body. The width of the first grid line 21 is smaller than the width of the second grid line 22. The first grid line 21 and the second grid line 22 are arranged in a corresponding and communicating manner, which is beneficial to ink transfer and improves the printing quality.
[0053] In the embodiment, the depth H of the recess structure 31 is 5 μm. The distance L between the second grid lines 22 of the recess structure 13 is 200 μm, which ensures that the printing screen 100 has high applicability, ensures the quality of the printing grid line 2 and the overall strength of the printing screen 100, and improves the printing quality. In the embodiment, the first layer body 13 and the second layer body 14 are both metal layer bodies containing nickel. The contact part of the first layer body 13 and the second layer body 14 can have a clear interface, or the interface can be unclear or integrated as a whole. In other embodiments, the first layer body 13 can be a polymer layer body, such as a PI layer body. The thickness of the first layer body 13 is 5 μm, and the recess structure 31 is recessed and arranged through the first layer body 13. Figure 3 In other embodiments, the recess structure 32 has a recess depth of 2 μm, the thickness of the first layer body 13 is 5 μm, and the recess structure 32 is not arranged through the first layer body 13.
[0054] In the embodiment, the printing screen 100 is a fine screen, and is used to print grid electrodes on a solar cell substrate (not shown). The printing screen 100 is provided with the recessed compensation part 3 on the bearing surface 12, which can correspond to the protrusions on the solar cell substrate. The recessed structure 31 accommodates the protrusions on the solar cell substrate, thereby ensuring the flatness of the bearing surface 12 during printing, ensuring the hole shape of the printed grid lines 2, avoiding the deformation of the printed grid lines 2 caused by the protrusions, compensating for the influence of the protrusions on the printing of the printing screen 100, thereby ensuring the ink transfer and improving the printing quality. The recessed structure 31 is set according to the position and parameters of the protrusions, thereby improving the applicability of the printing screen 100 and further improving the quality of the solar cell.
[0055] In other embodiments, please refer to Figure 4 The printing body 1 further comprises a third layer 15 between the first layer 13 and the second layer 14. The recessed structure 33 is provided on the first layer 13 but does not extend to the third layer 15. The printed grid lines 2 are provided with a third grid line 23 penetrating the third layer 15, and the width of the third grid line 23 is smaller than the width of the first grid line 21, thereby increasing the overall strength, improving the mesh stability of the printed grid lines 2, improving the ink transfer, and improving the printing quality. In other embodiments, the width of the third grid line 23 can also be equal to the width of the first grid line 21.
[0056] In other embodiments, please refer to Figure 5 The compensation part 3 comprises a recessed structure 34, and the line widths of the plurality of recessed structures 34 are different. In addition, the width of the third grid line 23 is greater than the width of the first grid line 21. Please refer to Figure 6 The compensation part 3 comprises a protruding structure 35, and the height of the protruding structure 35 is 3 μm in the embodiment. The protruding structure 35 can be adapted to the solar cell substrate with recesses, thereby improving the printing quality. Please refer to Figure 7 The compensation part 3 comprises a recessed structure 36 and a protruding structure 37, which compensates for the unevenness of the solar cell substrate and improves the printing quality.
[0057] Please refer to Figure 1 The printed grid lines 2 of the printing screen 100 are arranged at intervals in the first direction X. In other embodiments, please refer to Figure 8 The printed grid lines 2' are arranged continuously in the first direction X.
[0058] Please refer to Figure 9 and Figure 10The utility model discloses a kind of printing screen 200, it includes printing body 4 and the printing body 4 Several printing grid lines 5 of being provided in the printing body 4.The printing body 4 includes oppositely arranged printing face 41 and bearing surface 42.Bearing surface 42 has recessed compensation portion 6.The printing screen 200 is provided with recessed compensation portion 6, when printing, printing screen 200 can effectively fit, avoid squeegee movement to cause printing grid line 5 deformation and then influence the transmittance of slurry.Such, printing screen 200 has higher applicability, improve printing quality, avoid broken line and other problems.
[0059] The difference between printing screen 200 and printing screen 100 is that the setting position of compensation portion 6 is different from the setting position of compensation portion 3, and the setting position of printing grid line 5 is different from the setting position of printing grid line 2.Printing screen 200 can be applied to different battery substrates, and the recessed structure 61 of compensation portion 6 can accommodate different protrusions of the battery substrate to meet the printing needs and improve the applicability of printing screen 200.In other embodiments, printing screen 200 can also be used in cooperation with printing screen 100, and the recessed structure 61 of printing screen 200 is adapted to printing grid line 2 of printing screen 100.The recessed structure 31 of printing screen 100 corresponds to the original protrusion of the battery substrate, and the recessed structure 61 of printing screen 200 corresponds to the protrusion grid line electrode formed by printing screen 100 on the battery substrate.
[0060] In this embodiment, the printing body 4 includes a first layer 43 and a second layer 44 arranged in layers, and the first layer 43 and the second layer 44 are both metal layers containing nickel.The printing grid line 5 includes a first grid line 51 that penetrates the first layer 43 and a second grid line 52 that penetrates the second layer 44, and the width of the first grid line 51 is less than the width of the second grid line 52.In other embodiments, please refer to Figure 11 The printing body 4 also includes a third layer 45 between the first layer 43 and the second layer 44, and the printing grid line 5 includes a third grid line 53 that penetrates the third layer 45, and the width of the third grid line 45 is less than the width of the first grid line 51.In other embodiments, the width of the third grid line 53 can also be equal to or greater than the width of the first grid line 51.
[0061] The utility model discloses still disclose a kind of printing screen assembly (not shown), it includes first printing screen and second printing screen.In one embodiment, first printing screen is as described above printing screen 100, second printing screen is as described above printing screen 200.First printing screen and second printing screen are used in conjunction.The setting position of the compensation part 3 of first printing screen corresponds to the setting position of the printing grid line 5 of second printing screen, the setting position of the printing grid line 2 of first printing screen corresponds to the setting position of the compensation part 6 of second printing screen.Recess structure 31 corresponds to the protrusion on battery substrate, recess structure 61 corresponds to the grid line electrode formed by first printing screen printing on battery substrate.Form first grid line electrode and second grid line electrode on battery substrate.First printing screen is fine grid screen, and second printing screen is fine grid screen.Printing screen assembly can also include third printing screen, wherein third printing screen is main grid screen.
[0062] The utility model discloses still disclose a kind of solar cell (not shown), it includes battery substrate and the grid line electrode being set on battery substrate, grid line electrode includes main grid electrode, first fine grid electrode and second fine grid electrode.In one embodiment, first fine grid electrode is printed by as described above printing screen 100, and second fine grid electrode is printed by as described above printing screen 200.In other embodiments, first fine grid electrode and second fine grid electrode are printed by one as described above printing screen once;The compensation part of printing screen includes protruding structure and / or recess structure.In one embodiment, solar cell is BC cell, has stable grid line electrode, has higher quality and conductivity, increases its service life, improves conversion efficiency.
[0063] To make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiment of the utility model is described in detail above in conjunction with the drawings.In the above description, a lot of specific details are set forth in order to fully understand the utility model.However, the utility model can be implemented in many other ways different from the above description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the above disclosed specific embodiments.In addition, each technical feature of the above-described embodiments can be combined arbitrarily, in order to make the description concise, each technical feature in the above-described embodiments is not described all possible combinations, however, as long as the combination of these technical features does not exist contradictory, it should be considered that it is the scope recorded in this specification.
[0064] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.
Claims
1. A printing screen, characterized in that It comprises a printing body and a plurality of printing bars arranged on the printing body, the printing body comprises oppositely arranged printing surface and bearing surface, and the plurality of printing bars are arranged at intervals and each of the printing surface penetrates the bearing surface, wherein the bearing surface is provided with compensation parts in the form of protrusions and / or recesses.
2. The printing screen according to claim 1, characterized in that The compensation parts comprise recess structures recessed from the bearing surface, and the depth of the recess structures is greater than or equal to 1 μm.
3. The printing screen according to claim 2, characterized in that The printing bars extend along a first direction, and the plurality of printing bars are arranged at intervals along a second direction intersecting the first direction, the recess structures are in the form of a line grid and extend along the first direction; the recess structures are arranged at intervals from the printing bars, or the recess structures are arranged in communication with the printing bars.
4. The printing screen according to claim 3, characterized in that The recess structures extend continuously or discontinuously along the first direction, and the width of a single recess structure along the second direction is constant, gradually changes, regularly changes or randomly changes.
5. The printing screen according to claim 3, characterized in that The recess structures are arranged between adjacent printing bars, and the width of the plurality of recess structures is the same or different.
6. The printing screen according to claim 1, characterized in that The compensation parts comprise protrusion structures protruding from the bearing surface, and the thickness of the protrusion structures is greater than or equal to 1 μm.
7. The printing screen according to claim 6, characterized in that The printing bars are arranged at intervals from the protrusion structures, or the printing bars penetrate the protrusion structures.
8. The printing screen according to claim 1, characterized in that The compensation parts comprise recess structures and protrusion structures.
9. The printing screen according to claim 1, characterized in that The printing body comprises a first layer body and a second layer body arranged in layers, the bearing surface is arranged on the first layer body, the printing surface is arranged on the second layer body, and the compensation parts are arranged on the first layer body.
10. The printing screen according to claim 9, characterized in that The first layer body is a metal layer body containing nickel, or the first layer body is a polymer layer body.
11. The printing screen according to claim 9, characterized in that The printing bars comprise first bars arranged through the first layer body and second bars arranged through the second layer body, and the width of the first bars is smaller than the width of the second bars.
12. The printing screen according to claim 11, characterized in that The printing body further comprises a third layer body between the first layer body and the second layer body, the printing bars comprise third bars arranged through the third layer body, and the width of the third bars is smaller than or equal to or greater than the width of the first bars.
13. The printing screen according to claim 1, characterized in that The printing screen is a main screen or a fine screen.
14. A printing screen assembly, characterized by It comprises a first printing screen and a second printing screen used in cooperation, wherein the first printing screen is the printing screen according to any one of claims 1 to 12, the second printing screen is the printing screen according to any one of claims 1 to 12, and the compensation parts of the first printing screen and the compensation parts of the second printing screen have different positions.
15. The printing screen assembly of claim 14, wherein, The position of the compensation parts of the first printing screen corresponds to the position of the printing bars of the second printing screen, and the position of the printing bars of the first printing screen corresponds to the position of the compensation parts of the second printing screen.
16. A solar cell, characterized by, It comprises a battery substrate and a bar electrode printed by the printing screen according to any one of claims 1 to 13 or the printing screen assembly according to claim 14 or 15.
17. The solar cell of claim 16, wherein, The solar cell is a BC cell, and the bar electrode comprises a main grid electrode, a first fine grid electrode arranged in cross with the main grid electrode, and a second fine grid electrode arranged in cross with the main grid electrode.