Printing screen, solar cell and photovoltaic module

Abstract

Disclosed in the present application are a printing screen, a solar cell, and a photovoltaic module. The printing screen comprises a carrier and printing lines. The carrier comprises a printing surface and a contact surface which are arranged opposite each other. The printing lines include several ink passage channels extending from the printing surface to the contact surface and ink passage beams located between adjacent ink passage channels. The thickness of the ink passage beams is less than the thickness of the carrier, and the ink passage beams are configured to be recessed from the printing surface and / or recessed from the contact surface, such that conductive paste disposed on the printing surface can smoothly pass through the ink passage beams during printing, improving the fluidity of the paste and ensuring the application of an appropriate amount of paste, thereby improving ink transfer performance, improving the service life and fabrication yield, and ensuring printing quality.

Description

Printing screens, solar cells and photovoltaic modules Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a printing screen, solar cell and photovoltaic module. Background Technology

[0002] A printing screen is an important tool for printing the electrodes of a solar cell. The paste is poured onto the printing screen and a squeegee is used to move the paste on the screen, so that the paste is squeezed through the grid holes on the printing screen and onto the solar cell, forming a corresponding pattern on the solar cell to form the electrodes of the solar cell.

[0003] Conventional solar cells utilize screen printing to print fine grid electrodes or main grid electrodes on their surface. 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 stencil is used to print the fine grid electrodes, and the main grid stencil is used to print the main grid electrodes. Therefore, the ink application performance of the screen printing stencil, including the fluidity and appropriate amount of ink, is particularly important and a key research area to ensure printing quality. Summary of the Invention

[0004] Therefore, it is necessary to provide a new printing screen, solar cell, and photovoltaic module to solve the above-mentioned technical problems.

[0005] Therefore, one technical solution of this application is: a printing screen, comprising:

[0006] A carrier, comprising a printing surface and a mounting surface disposed opposite to each other;

[0007] A printing line includes a plurality of ink passages extending from the printing surface to the substrate surface and ink beams located between adjacent ink passages; wherein the thickness of the ink beams is less than the thickness of the substrate, and the ink beams are recessed from the printing surface and / or from the substrate surface.

[0008] In one embodiment, the ink beam includes a top surface located on the printing surface side and a bottom surface located on the mounting surface side, the top surface and the bottom surface being disposed opposite to each other, wherein the top surface is a plane, a convex surface or a concave surface, and the bottom surface is a plane, a convex surface or a concave surface; the top surface is recessed from the printing surface, and / or the bottom surface is recessed from the mounting surface.

[0009] In one embodiment, the bottom surface is recessed from the bearing surface, and the printing line further includes a beam bottom side surface located between the bearing surface and the bottom surface. The ink-passing beam is mounted on two opposing beam bottom side surfaces, and a first ink-passing space communicating with the ink-passing channel is formed between the bottom surface and the two beam bottom side surfaces. The beam bottom side surface is vertically arranged, inclined, or arc-shaped.

[0010] In one embodiment, the top surface is flush with the printing surface, or the top surface is an arc-shaped convex surface that protrudes from the printing surface, or the top surface is an arc-shaped concave surface that is recessed relative to the printing surface.

[0011] In one embodiment, the top surface is recessed from the printing surface, and the printing line further includes a beam top side located between the printing surface and the top surface. The ink-passing beam is horizontally disposed below the two beam top sides disposed opposite to each other, and a second ink-passing space communicating with the ink-passing channel is formed between the top surface and the two beam top sides.

[0012] In one embodiment, the top surface is parallel to the printing surface, or the top surface is an arc-shaped convex surface, or the top surface is an arc-shaped concave surface; the top side of the beam is vertically arranged, inclined, or arc-shaped.

[0013] In one embodiment, the carrier includes a first base layer and a second base layer stacked together. The first base layer includes a first through-hole, and the second base layer includes a second through-hole. The first and second openings are corresponding to and connected to each other. The diameter of the first opening is less than or equal to the diameter of the second opening. The second base layer includes the ink-passing beam, which is located between two adjacent second openings.

[0014] In one embodiment, the carrier further includes a third base layer stacked on top of each other, the second base layer being located between the first base layer and the second base layer, the third base layer including a through third opening, the third opening corresponding to and communicating with the second opening, the diameter of the third opening being greater than or equal to the diameter of the first opening and less than or equal to the diameter of the second opening.

[0015] In one embodiment, the first base layer and / or the third base layer further include an auxiliary beam superimposed on the ink-passing beam.

[0016] In one embodiment, a grid is distributed within the printing line, the mesh openings of the grid forming the ink passage channels, and the mesh lines between adjacent ink passage channels forming the ink passage beams.

[0017] In one embodiment, the mesh is segmented, honeycomb-shaped, arrayed, or random, and the mesh openings are polygonal, circular, elliptical, waist-shaped, or irregularly shaped.

[0018] In one embodiment, the printing screen is a fine grid screen, the printing line is a fine grid stitch line, the fine grid stitch line extends along a first direction, and a plurality of the fine grid stitch lines are spaced apart along the first direction and spaced apart along a second direction.

[0019] In one embodiment, the printing screen is a main grid screen, the printing line includes a main grid seam, the main grid seam extends along a second direction, and a plurality of the main grid seams are spaced apart along a first direction. The main grid seam includes a main line extending along the second direction, a harpoon portion located at one end of the main line, and pad portions spaced apart from the main line.

[0020] In one embodiment, the printing line further includes a main grid gap, which extends along a first direction, and a plurality of main grid gaps are arranged along a second direction to form a connecting group. The main grid gap is in the shape of a tube bone, a waist-shaped hole, or a rectangle.

[0021] This application also discloses a solar cell comprising a semiconductor substrate and an electrode structure disposed on the semiconductor substrate and printed by a screen printing plate as described above.

[0022] This application also discloses a photovoltaic module comprising a plurality of solar cells as described above and solder strips connecting the plurality of said solar cells.

[0023] The beneficial effects of this application are as follows: The thickness of the ink guide beam is set to be less than the thickness of the support body, and the ink guide beam is recessed from the printing surface and / or from the supporting surface, so that the ink can pass smoothly through the ink guide beam during printing, thereby improving the fluidity and quantity of the ink, thus improving ink application, increasing service life and preparation yield, and ensuring printing quality. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of the printing screen of this application;

[0025] Figure 2 is a cross-sectional view of line AA in Figure 1;

[0026] Figure 3 is a cross-sectional schematic diagram of line BB in Figure 1;

[0027] Figure 4 is another cross-sectional schematic diagram of Figure 3;

[0028] Figure 5 is another cross-sectional schematic diagram of Figure 3;

[0029] Figure 6 is another cross-sectional schematic diagram of Figure 3;

[0030] Figure 7 is another cross-sectional schematic diagram of Figure 3;

[0031] Figure 8 is another cross-sectional view of Figure 3;

[0032] Figure 9 is a schematic diagram of another structure of the printing screen of this application;

[0033] Figure 10 is a cross-sectional view of the CC line in Figure 9;

[0034] Figure 11 is a cross-sectional schematic diagram of the DD line in Figure 9;

[0035] Figure 12 is another cross-sectional schematic diagram of Figure 11;

[0036] Figure 13 is another cross-sectional schematic diagram of Figure 11;

[0037] Figure 14 is another cross-sectional schematic diagram of Figure 11;

[0038] Figure 15 is another cross-sectional schematic diagram of Figure 11;

[0039] Figure 16 is another cross-sectional schematic diagram of Figure 11;

[0040] Figure 17 is another cross-sectional schematic diagram of Figure 11;

[0041] Figure 18 is a schematic diagram of another structure of the printing screen of this application;

[0042] Figure 19 is a cross-sectional schematic diagram of the EE line in Figure 18;

[0043] Figure 20 is a cross-sectional schematic diagram of the FF line in Figure 18. Detailed Implementation

[0044] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0045] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] 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 this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] This application discloses a printing screen comprising a carrier and printing lines. The carrier includes a printing surface and a substrate surface disposed opposite to each other. The printing lines include a plurality of ink passages extending from the printing surface to the substrate surface and ink beams located between adjacent ink passages. The thickness of the ink beams is less than the thickness of the carrier, and the ink beams are recessed from the printing surface and / or from the substrate surface, so that the ink paste on the printing surface can smoothly pass through the ink beams during printing, improving the fluidity and quantity of the ink paste, thereby improving ink application, increasing service life and production yield, and ensuring printing quality. Conductive ink paste is disposed on the printing surface. A doctor blade moves the ink paste on the printing surface, and the ink paste falls onto the semiconductor substrate of a solar cell through the ink passages and ink beams to form an electrode structure. The substrate surface faces the semiconductor substrate.

[0048] In one embodiment, the ink guide beam includes a top surface located on the printing surface side and a bottom surface located on the substrate side, the top and bottom surfaces being disposed opposite to each other, wherein the top surface is a plane, a convex surface, or a concave surface, and the bottom surface is a plane, a convex surface, or a concave surface. The top surface is recessed from the printing surface, and / or the bottom surface is recessed from the substrate side to improve ink flow. When the top surface is convex or concave, it can be entirely convex or concave, or partially convex or concave; when the bottom surface is convex or concave, it can be entirely convex or concave, or partially convex or concave.

[0049] In one embodiment, the bottom surface is recessed from the supporting surface, and the printing line further includes a beam bottom side located between the supporting surface and the bottom surface. The ink-passing beam is mounted on the two opposing beam bottom sides, and a first ink-passing space communicating with the ink-passing channel is formed between the bottom surface and the two beam bottom sides. The beam bottom sides can be vertically arranged, inclined, or arc-shaped. When the bottom surface is recessed, the top surface is flush with the printing surface, or the top surface is an arc-shaped convex surface that protrudes from the printing surface, or the top surface is an arc-shaped concave surface that is recessed relative to the printing surface; or the top surface is recessed from the printing surface.

[0050] In one embodiment, the top surface is recessed from the printing surface, and the printing line also includes a beam top side located between the printing surface and the top surface. An ink-passing beam is horizontally positioned below the two opposing beam top sides, forming a second ink-passing space communicating with the ink-passing channel between the top surface and the two beam top sides. The conductive paste, after passing through the second ink-passing space, can easily bypass the ink-passing beam and enter the first ink-passing space, ensuring ink delivery. The top surface is parallel to the printing surface, or the top surface is a curved convex surface, or the top surface is a curved concave surface; the beam top sides are vertically positioned, inclined, or curved.

[0051] In one embodiment, the carrier includes a first base layer and a second base layer stacked together. The first base layer includes a through-hole, and the second base layer includes a through-hole. The first and second openings correspond to and are connected. The diameter of the first opening is less than or equal to the diameter of the second opening. The second base layer includes a guide beam located between two adjacent second openings. The bottom surface of the guide beam faces the first opening, and the sidewall of the first opening forms a beam bottom side on the underside of the guide beam. The top surface of the guide beam is parallel, convex, or recessed. The first base layer is a metal layer or a polymer layer, and the second base layer is a metal layer or a polymer layer, such as a nickel layer, an alloy nickel layer, or a PI layer.

[0052] Furthermore, the support structure also includes a third layer layer stacked on top of the second layer layer, with the second layer layer located between the first and second layers. The third layer layer includes a through-hole, which corresponds to and communicates with the second opening. The diameter of the third opening is greater than or equal to the diameter of the first opening and less than or equal to the diameter of the second opening. The top surface of the ink beam faces the third opening, and the sidewall of the third opening forms the top side of the beam on the upper side of the ink beam. The third layer layer is a metal layer or a polymer layer, such as a nickel layer, an alloy nickel layer, or a PI layer.

[0053] Furthermore, the first base layer and / or the third base layer also include auxiliary beams superimposed on the ink-conducting beam. The thickness of the auxiliary beam is less than that of the first or third base layer, and the auxiliary beam is completely or partially superimposed on the ink-conducting beam to increase the strength of the ink-conducting beam.

[0054] In one embodiment, a grid is distributed within the printing line, and the mesh openings of the grid form ink passage channels. The mesh lines between adjacent ink passage channels form ink passage beams. The grid is bamboo-shaped, honeycomb-shaped, array-shaped, or random, and the mesh openings are polygonal, circular, elliptical, waist-shaped, or irregularly shaped.

[0055] In one embodiment, the printing screen is a fine grid screen, and the printing lines are fine grid seams. The fine grid seams extend along a first direction, and a plurality of fine grid seams are spaced apart along the first direction and spaced apart along a second direction. The fine grid screen has better ink distribution performance, thus improving printing quality.

[0056] In one embodiment, the printing screen is a main grid screen, and the printing lines include main grid seams extending along a second direction. A plurality of main grid seams are spaced apart along a first direction. Each main grid seam includes a main line extending along the second direction, a harpoon-shaped portion at one end of the main line, and pads spaced apart on the main line. Furthermore, the printing lines also include main grid slots extending along the first direction. A plurality of main grid slots are arranged along the second direction to form a connecting group. The main grid slots are cylindrical, waist-shaped, or rectangular. The main grid screen has better ink distribution performance, improving printing quality.

[0057] This application also discloses a solar cell comprising a semiconductor substrate and an electrode structure disposed on the semiconductor substrate and printed by a screen printing plate as described above. The electrode structure has good structural performance and good conductivity, thereby improving conversion efficiency.

[0058] This application also discloses a photovoltaic module comprising a plurality of solar cells as described above and solder strips connecting the plurality of solar cells, which has good conductivity and improves conversion efficiency.

[0059] The following examples, with reference to Figures 1 to 19, illustrate the printing screen of this application.

[0060] Referring to Figures 1 to 3, this application discloses a printing screen 100, which includes a carrier 101 and printing lines 102. The carrier 101 includes a first base layer 1 and a second base layer 2 stacked together. The first base layer 1 has a bearing surface 11, and the second base layer 2 has a printing surface 21, which are disposed opposite to the bearing surface 11. The printing lines 102 include a plurality of ink passages 3 extending from the printing surface 21 to the bearing surface 11 and ink beams 4 located between adjacent ink passages 3. The first base layer 1 includes a through-hole 12, and the second base layer 2 includes a through-hole 22. The first opening 12 and the second opening 22 are corresponding and connected to form the ink passages 3. The diameter of the first opening 12 is smaller than the diameter of the second opening 22. In other embodiments, the diameter of the first opening 12 is equal to the diameter of the second opening 22. The ink beams 4 are located on the second base layer 2 and are disposed between adjacent second openings 22. The ink-passing beam 4 is recessed from the bearing surface 11. The ink-passing beam 4 includes a top surface 41 on the printing surface 21 side and a bottom surface 42 on the bearing surface 11 side. The top surface 41 and the bottom surface 42 are arranged opposite each other, with the top surface 41 being coplanar with the printing surface 21. The bottom surface 42 is recessed relative to the bearing surface 11, and the bottom surface 22 is an arc-shaped concave surface. The sidewall of the first opening 12 forms a beam bottom side surface 43 on the lower side of the ink-passing beam 4, and a first ink-passing space 431 is formed between the two oppositely arranged beam bottom side surfaces 43 and the bottom surface 42. The thickness of the ink-passing beam 4 is less than the thickness of the carrier 101. During printing, the ink can pass smoothly through the ink-passing beam 4 to improve the fluidity and quantity of the ink, thereby improving ink application, increasing the service life and preparation yield of the printing screen 100, and ensuring printing quality. In this embodiment, both the first base layer 1 and the second base layer 2 are nickel layers. When the first base layer 1 and the second base layer 2 are stacked, there may be an interface between the two layers, or there may be no interface and they may be set as a whole. In other embodiments, the first base layer 1 or the second base layer 2 is a nickel alloy or a PI layer, etc.

[0061] The printing screen 100 can be a fine grid screen, and the printing lines 102 are fine grid seams. Alternatively, the printing screen 100 can be a main grid screen, and the printing lines 102 are main grid seams. A grid is distributed within the printing lines 102, and the mesh openings form ink passage channels 3. The mesh lines between adjacent ink passage channels 3 form ink passage beams 4. The grid is bamboo-like; in other embodiments, the grid is honeycomb-like, array-like, or random. The mesh openings are rectangular; in other embodiments, the mesh openings are circular, elliptical, waist-shaped, or irregularly shaped.

[0062] In this embodiment, the top surface 41 is a plane and the bottom surface 42 is a concave surface. In other embodiments, please refer to Figures 4 to 8. The top surface 41 can also be a convex or concave surface, and the bottom surface 42 can also be a plane or a convex surface. Specifically: Please refer to Figure 4, the top surface 41 is a plane and is set on the same plane as the printing surface 21, and the bottom surface 42 is a convex surface and is recessed relative to the bearing surface 11; Please refer to Figure 5, the top surface 41 is a concave surface, and the bottom surface 42 is also a concave surface; Please refer to Figure 6, the top surface 41 is a concave surface, and the bottom surface 42 is a convex surface; Please refer to Figure 7, the top surface 41 is a convex surface, and the bottom surface 42 is a concave surface; Please refer to Figure 8, the top surface 41 is a convex surface, and the bottom surface 42 is also a convex surface; and the thickness of the ink beam 4 is less than the thickness of the carrier 102, which improves ink flow.

[0063] Please refer to Figures 9 to 11. This application discloses another printing screen 200, which includes a carrier 201 and printing lines 202. The carrier 201 includes a first base layer 5, a second base layer 6, and a third base layer 7 stacked sequentially. The first base layer 5 has a bearing surface 51, and the third base layer 7 has a printing surface 71, which are disposed opposite to the bearing surface 51. The printing lines 202 include a plurality of ink passages 8 extending from the printing surface 71 to the bearing surface 51 and ink beams 9 located between adjacent ink passages 8, through which conductive paste will enter the ink passages 8 from the printing surface 71. The first base layer 5 includes a through-hole 52, the second base layer 6 includes a through-hole 61, and the third base layer 7 includes a through-hole 72. The first opening 52, the second opening 61, and the third opening 72 are correspondingly and interconnected to form the ink passages 8. The ink beams 9 are located in the second base layer 6 and are disposed between adjacent second openings 61. The ink-passing beam 9 is recessed from both the mounting surface 51 and the printing surface 71. The ink-passing beam 9 includes a top surface 91 on the printing surface 71 side and a bottom surface 92 on the mounting surface 51 side. The top surface 91 and bottom surface 92 are positioned opposite each other. The top surface 91 is planar and parallel to the printing surface 71, while the bottom surface 92 is an arc-shaped concave surface. The sidewall of the first opening 51 forms a beam bottom side surface 93 on the lower side of the ink-passing beam 9, and a first ink-passing space 931 is formed between the two opposite beam bottom side surfaces 93 and the bottom surface 92. The sidewall of the third opening 72 forms a beam top side surface 94 on the upper side of the ink-passing beam 9, and a second ink-passing space 941 is formed between the two opposite beam top side surfaces 94 and the top surface 91. The ink-passing beam 9 is horizontally positioned below the two opposite beam top side surfaces 94. During printing, the ink paste can pass smoothly through the ink beam 9 to improve its fluidity and quantity, thereby improving ink application, increasing the lifespan and yield of the printing screen 200, and ensuring printing quality. In this embodiment, the first base layer 5, the second base layer 6, and the third base layer 7 are all nickel layers, and there may be or may not be an interface between adjacent layers. In other embodiments, the first base layer 5, the second base layer 6, and the third base layer 7 are metal layers or polymer layers such as nickel layers, nickel alloy layers, and PI layers.

[0064] The printing screen 200 can be a fine grid screen, and the printing lines 202 are fine grid seams. Alternatively, the printing screen 200 can be a main grid screen, and the printing lines 202 are main grid seams. A grid is distributed within the printing lines 202, and the mesh openings form ink passage channels 8. The mesh lines between adjacent ink passage channels 8 form ink passage beams 9. The grid is bamboo-like; in other embodiments, the grid is honeycomb-like, array-like, or random. The mesh openings are rectangular; in other embodiments, the mesh openings are circular, elliptical, waist-shaped, or irregularly shaped.

[0065] The diameter of the second opening 61 is larger than the diameter of the first opening 52, and the diameter of the third opening 72 is smaller than the diameter of the second opening 61. The diameter of the third opening 72 is equal to the diameter of the first opening 52. In other embodiments, the diameter of the third opening 72 is larger than the diameter of the first opening 52 and smaller than the diameter of the second opening 61. In other embodiments, the first base layer 5 and / or the third base layer 7 also include an auxiliary beam superimposed on the ink-passing beam 9. The thickness of the auxiliary beam is less than that of the first base layer 5 or the third base layer 7, and the auxiliary beam 7 is completely or partially superimposed on the ink-passing beam 9 to increase the strength of the ink-passing beam 9.

[0066] In this embodiment, the top surface 91 is a plane and the bottom surface 92 is a concave surface. In other embodiments, please refer to Figures 12 to 16. The top surface 91 can also be a convex or concave surface, and the bottom surface 92 can also be a plane or a convex surface. Specifically: Please refer to Figure 12, the top surface 91 is a plane and is parallel to the printing surface 71, and the bottom surface 92 is a plane and is parallel to the mounting surface 51; Please refer to Figure 13, the top surface 91 is concave, and the bottom surface 92 is also concave; Please refer to Figure 14, the top surface 91 is a plane, and the bottom surface 92 is a convex surface; Please refer to Figure 15, the top surface 91 is concave, and the bottom surface 92 is convex; Please refer to Figure 16, the top surface 91 is convex, and the bottom surface 92 is also convex; Please refer to Figure 17, the top surface 91 is convex, and the bottom surface 92 is concave; and the thickness of the ink beam 9 is less than the thickness of the carrier 202, improving ink flow.

[0067] Please refer to Figures 18 to 20. This application discloses another printing screen 300, a carrier 301, and printing lines 302. Compared to the printing screen 200, the printing screen 300 has an aperture including a third opening 72' that is larger than the aperture of the first opening 52' and smaller than the aperture of the second opening 61'. The top surface 91' of the ink beam 9' is flat, and the bottom surface 92' is an arc-shaped concave surface. In other embodiments, the top surface 91' is concave or convex, and the bottom surface 92' is flat or convex.

[0068] The printing screen 300 can be a fine grid screen, and the printing lines 302 are fine grid seams. Alternatively, the printing screen 300 can be a main grid screen, with the printing lines 302 being the main grid seams. A grid is distributed within the printing lines 302, and the mesh openings form ink passage channels 8'. The mesh lines between adjacent ink passage channels 8' form ink passage beams 9'. The grid is bamboo-like; in other embodiments, the grid is honeycomb-like, array-like, or random. The mesh openings are rectangular; in other embodiments, the mesh openings are circular, elliptical, waist-shaped, or irregularly shaped.

[0069] To make the above-described objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application have been described in detail above with reference to the accompanying drawings. Many specific details have been set forth in the above description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described above, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed above. Furthermore, the technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A printing screen, characterized in that It includes: A carrier, comprising a printing surface and a mounting surface disposed opposite to each other; A printing line includes a plurality of ink passages extending from the printing surface to the substrate surface and ink beams located between adjacent ink passages; wherein the thickness of the ink beams is less than the thickness of the substrate, and the ink beams are recessed from the printing surface and / or from the substrate surface.

2. The printing screen according to claim 1, characterized in that The ink-passing beam includes a top surface located on the printing surface side and a bottom surface located on the mounting surface side, the top surface and the bottom surface being disposed opposite to each other, wherein the top surface is a plane, a convex surface or a concave surface, and the bottom surface is a plane, a convex surface or a concave surface; the top surface is recessed from the printing surface, and / or the bottom surface is recessed from the mounting surface.

3. The printing screen according to claim 2, characterized in that The bottom surface is recessed from the bearing surface, and the printing line also includes a beam bottom side surface located between the bearing surface and the bottom surface. The ink-passing beam is mounted on two opposing beam bottom side surfaces, and a first ink-passing space communicating with the ink-passing channel is formed between the bottom surface and the two beam bottom side surfaces. The beam bottom side surface is vertically arranged, inclined, or arc-shaped.

4. The printing screen according to claim 3, characterized in that The top surface is flush with the printing surface, or the top surface is an arc-shaped convex surface that protrudes from the printing surface, or the top surface is an arc-shaped concave surface that is recessed relative to the printing surface.

5. The printing screen according to claim 2 or 3, characterized in that The top surface is recessed from the printing surface, and the printing line also includes a beam top side located between the printing surface and the top surface. The ink-passing beam is horizontally arranged below the two beam top sides arranged opposite to each other, and a second ink-passing space communicating with the ink-passing channel is formed between the top surface and the two beam top sides.

6. The printing screen according to claim 5, characterized in that The top surface is parallel to the printed surface, or the top surface is an arc-shaped convex surface, or the top surface is an arc-shaped concave surface; the top side of the beam is vertically arranged, inclined, or arc-shaped.

7. The printing screen according to claim 1, characterized in that The carrier includes a first base layer and a second base layer stacked together. The first base layer includes a first through-hole, and the second base layer includes a second through-hole. The first and second openings are corresponding to and connected to each other. The diameter of the first opening is less than or equal to the diameter of the second opening. The second base layer includes the ink-passing beam, which is located between two adjacent second openings.

8. The printing screen according to claim 7, characterized in that The carrier further includes a third base layer stacked on top of each other, with the second base layer located between the first base layer and the second base layer. The third base layer includes a third through-hole, which corresponds to and communicates with the second through-hole. The diameter of the third through-hole is greater than or equal to the diameter of the first through-hole and less than or equal to the diameter of the second through-hole.

9. The printing screen according to claim 8, characterized in that The first base layer and / or the third base layer also include an auxiliary beam superimposed on the ink-passing beam.

10. The printing screen according to claim 1, characterized in that The printing line has a grid distributed within it, and the mesh openings of the grid form the ink passage channels. The mesh lines between adjacent ink passage channels form the ink passage beams.

11. The printing screen according to claim 10, characterized in that The grid is segmented, honeycomb-shaped, arrayed, or random, and the mesh openings are polygonal, circular, elliptical, oblong, or irregular in shape.

12. The printing screen according to claim 1, characterized in that The printing screen is a fine screen, the printing line is a fine screen line, the fine screen line extends along a first direction, and a plurality of fine screen lines are arranged along a first direction and arranged along a second direction.

13. The printing screen according to claim 1, characterized in that The printing screen is a master screen, the printing line includes a master screen line, the master screen line extends along a second direction, a plurality of master screen lines are arranged along a first direction, and the master screen line includes a main line extending along a second direction, a fishhook part at one end of the main line, and a pad part arranged at intervals on the main line.

14. The printing screen according to claim 11, characterized in that The printing line further includes a master screen gap line, the master screen gap line extends along a first direction, a plurality of master screen gap lines are arranged along a second direction to form a connection group, and the master screen gap line is in the shape of a barrel bone, a waist hole, or a rectangle.

15. A solar cell, characterized by, It includes a semiconductor substrate and an electrode structure arranged on the semiconductor substrate and printed by the printing screen according to any one of claims 1 to 14.

16. A photovoltaic module, characterized by It includes a plurality of the solar cell pieces according to claim 15 and a solder strip connecting the plurality of solar cell pieces.

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