Fine screen, screen assembly and solar cell piece

Abstract

The utility model discloses a fine screen, it includes the bearing layer and the inking layer of laminated arrangement. The bearing layer is provided with the printing face, and the inking layer is provided with the printing face, and the printing face and the printing face are opposite and set up. The bearing layer is distributed with a plurality of fine grid bars of through -going arrangement, and the fine grid bar extends along the first direction, and a plurality of fine grid bars are arranged at intervals along the second direction crossing the first direction, and the adjacent fine grid bar is the metal strip of not through -going arrangement. The fine grid bar includes a plurality of grid holes of through -going bearing layer arrangement, and the adjacent grid hole forms the ink bridge, and the inking layer includes the inking line hole of through -going inking layer arrangement, and the inking line hole is adapted to the fine grid bar and is set up, and the inking line hole is communicated with the grid hole and is set up, and the inking line hole is set up on the ink bridge, strengthens the strength of fine screen, improves the life of fine screen, is favorable to the inking property, and improves the printing quality, reduces the cost. In addition, the utility model also discloses a screen assembly and a solar cell piece.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a fine grid screen, a screen module and a solar cell. Background Technology

[0002] Screen printing is a crucial tool for printing electrodes on solar cells. A paste is poured onto the screen, and a squeegee moves the paste across the screen, forcing it through the mesh and onto the solar cell to form a pattern, thus creating the electrodes. Conventional solar cells use screen printing to print fine grid electrodes and main grid electrodes. The fine grid electrodes collect the current generated by sunlight, while the main grid electrodes collect the current from the fine grid lines. The fine grid screen is used to print the fine grid electrodes, and the main grid screen is used to print the main grid electrodes. However, prolonged continuous printing on the fine grid screen can lead to wear, tear, and other damage, rendering the printed surface unusable and severely hindering the control and development of solar cell manufacturing costs. Therefore, improving the lifespan of the fine grid screen is of paramount importance. Summary of the Invention

[0003] Based on this, it is necessary to provide a new fine grid screen, printing screen, and solar cell to solve the above-mentioned technical problems. One technical solution of this utility model is: a fine grid screen, comprising a carrier layer and an ink layer stacked together. The carrier layer has a printing surface, and the ink layer has a printing substrate surface, with the printing surface and the printing substrate surface facing each other. The carrier layer has a plurality of penetrating fine grid strips extending along a first direction, and the fine grid strips are spaced apart along a second direction intersecting the first direction. Adjacent fine grid strips are separated by non-penetrating metal strips. Each fine grid strip includes a plurality of grid holes penetrating the carrier layer, with ink bridges formed between adjacent grid holes. The ink layer includes ink line holes penetrating the ink layer, which are adapted to the fine grid strips and communicate with the grid holes. The ink bridges are mounted on the ink line holes.

[0004] In one embodiment, the grid holes include fence holes extending along a second direction, and a plurality of fence holes are arranged at intervals along a first direction, with the ink-passing bridge formed between adjacent fence holes; the length of the fence holes ranges from 200 μm to 2000 μm, the width of the fence holes ranges from 50 μm to 500 μm, and the width of the ink-passing bridge ranges from 5 μm to 30 μm.

[0005] In one embodiment, the fence hole is elongated and its ends are right-angled, chamfered, or arc-shaped.

[0006] In one embodiment, the grid holes include mesh holes, and the mesh lines between adjacent mesh holes form ink bridges. The diameter of the mesh holes ranges from 50 μm to 500 μm, and the width of the ink bridges ranges from 5 μm to 30 μm.

[0007] In one embodiment, the length of the ink line hole is less than the distribution length of the fine grid strips.

[0008] In one embodiment, the width of the ink line hole ranges from 3 μm to 150 μm.

[0009] In one embodiment, the carrier layer and the ink layer are stacked in layers, or the carrier layer and the ink layer are integrally formed.

[0010] In one embodiment, the carrier layer is a nickel layer or a nickel alloy layer, and the ink layer is a nickel layer, a nickel alloy layer, or a polymer layer.

[0011] This utility model also provides a screen assembly, which includes a main grid screen and a fine grid screen as described above.

[0012] This utility model also provides a solar cell, which includes a semiconductor substrate and an electrode structure disposed on the semiconductor substrate. The electrode structure includes a main grid electrode and a fine grid electrode formed by printing using the screen printing assembly as described above.

[0013] The beneficial effects of this utility model are as follows: the fine grid strip includes a plurality of grid holes that penetrate the bearing layer, and ink bridges are formed between adjacent grid holes. The lower ink layer includes ink line holes that penetrate the lower ink layer. The ink line holes are adapted to fit the fine grid strip and are connected to the grid holes. Ink bridges are erected on the ink line holes. The strength of the fine screen printing plate has been enhanced, its lifespan has been increased, ink application has been improved, printing quality has been enhanced, and costs have been reduced. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the fine mesh plate of this utility model; Figure 2 is an enlarged schematic diagram of circle A1 in Figure 1; Figure 3 is Figure 2 Partial cross-sectional diagram; Figure 4 is Figure 2 Another partial cross-sectional diagram; Figure 5 is a schematic diagram of the carrier layer of the fine grid plate in Figure 1; Figure 6 is an enlarged schematic diagram of circle B in Figure 5; Figure 7 is a schematic diagram of the lower ink layer of the fine grid plate in Figure 1; Figure 8 is an enlarged schematic diagram of circle C in Figure 7; Figure 9 is a schematic diagram of another type of fence hole in the fine grid plate of this utility model; Figure 10 is a schematic diagram of another type of fence hole in the fine mesh plate of this utility model; Figure 11 is another schematic diagram of the grid holes of the fine mesh version of this utility model; Figure 12 is another schematic diagram of the grid holes of the fine mesh version of this utility model. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model 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 utility model.

[0016] 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.

[0017] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] This utility model discloses a fine grid screen, comprising a carrier layer and an ink layer stacked together. The carrier layer has a printing surface, and the ink layer has a printing substrate surface, with the printing surface and printing substrate surface facing each other. The carrier layer has a plurality of penetrating fine grid strips extending along a first direction, and the fine grid strips are spaced apart along a second direction intersecting the first direction, with non-penetrating metal strips between adjacent fine grid strips. Each fine grid strip includes a plurality of grid holes penetrating the carrier layer, forming ink bridges between adjacent grid holes. The ink layer includes ink line holes penetrating the ink layer, which are adapted to fit the fine grid strips and communicate with the grid holes. Ink bridges are erected on the ink line holes, strengthening the fine grid screen, increasing its lifespan, improving ink application, enhancing printing quality, and reducing costs.

[0019] The arrangement of grid holes varies, including linear arrangements in a single row, multiple parallel linear arrangements, staggered arrangements, grid arrangements, or polar coordinate arrangements. Specifically, staggered arrangements generally involve adjacent grid holes being misaligned, such as honeycomb or hexagonal grids; grid arrangements typically include rectangular, circular, polygonal, or random grids; polar coordinate arrangements involve grid holes distributed along a circumference or radius. The shape of a single grid hole can be triangular, polygonal, circular, elliptical, or irregular. The distribution direction of the grid holes can be parallel, right-angled, or at an included angle. Parameters of multiple grid holes, such as aperture diameter, internal angle, distribution angle, and distribution period, may be the same or different.

[0020] The carrier layer has fine grids on the printing surface, with multiple grid holes distributed throughout the grids, extending through the carrier layer. These grid holes are mesh-like or fence-like and distributed along the fine grids. Ink line holes are installed through the ink layer, matching the fine grids and communicating with the grid holes. During printing, the ink enters the grid holes on the printing surface, passes through the ink line holes, and then falls from the printing surface. The grid holes improve the overall strength of the main grid and enhance ink adhesion. Metal strips are placed between adjacent fine grids. These metal strips do not have grid holes and may be raised or recessed but not extending through the entire layer. For example, the metal strips may be continuous.

[0021] Furthermore, the grid openings include fence openings extending along a second direction, with a plurality of fence openings spaced apart along a first direction, forming ink-crossing bridges between adjacent fence openings. The length of the fence openings ranges from 200 μm to 2000 μm, the width of the fence openings ranges from 50 μm to 500 μm, and the width of the ink-crossing bridges ranges from 5 μm to 30 μm. The fence openings are elongated, and their ends are right-angled, chamfered, or arc-shaped, which can further enhance ink application, structural strength, and stability.

[0022] In one embodiment, the fence opening is waist-shaped, and the arc-shaped structure at both ends ensures the overall strength.

[0023] In one embodiment, the length of the ink line is less than the distribution length of the fine grid strips, that is, no ink line is provided under the 1-5 grid holes at both ends of the fine grid strips, thereby improving strength and ink application.

[0024] In one embodiment, the grid holes include mesh holes, and the mesh lines between adjacent mesh holes form ink bridges. The diameter of the mesh holes ranges from 50 μm to 500 μm, and the width of the ink bridges ranges from 5 μm to 30 μm.

[0025] In one embodiment, the width of the ink line ranges from 3 μm to 150 μm to ensure ink dispensing performance.

[0026] In one embodiment, the carrier layer is a metal layer or an alloy layer. The ink layer is a metal layer or a polymer layer.

[0027] The carrier layer and the ink layer can be set in separate layers, or they can be set as a single unit. For example, the carrier layer and the ink layer can be made of the same material, and the layers can be fused together without a clear interface, forming a single structure.

[0028] In one embodiment, the fine grid plate further includes other metal layers, alloy layers, or polymer layers, with the metal layers or alloy layers combined with a carrier layer, and the metal layers, alloy layers, or polymer layers combined with an ink-dip layer, to increase strength and ink-dip performance.

[0029] In one embodiment, the fine grid plate further includes other metal layers, alloy layers, or polymer layers, with the metal layers or alloy layers combined with a carrier layer, and the metal layers, alloy layers, or polymer layers combined with an ink-dip layer, to increase strength and ink-dip performance.

[0030] This utility model also discloses a screen printing assembly, which includes a main grid screen and a fine grid screen as described above.

[0031] This invention also discloses a solar cell, comprising a semiconductor substrate and an electrode structure disposed on the semiconductor substrate. The electrode structure includes a main grid electrode and a fine grid electrode formed by printing using the screen printing assembly described above. The screen printing assembly has high strength, good ink absorption, long service life, good printing quality, and the electrode structure has good conductivity and high conversion efficiency.

[0032] The fine grid version of this utility model is described below with reference to Figures 1 to 10.

[0033] Please refer to Figure 1 to... Figure 8This utility model discloses a fine grid printing plate 100, which includes a carrier layer 1 and an ink layer 2 stacked together. The carrier layer 1 has a printing surface 11, and the ink layer 2 has a printing substrate 21, with the printing surface 11 and the printing substrate 21 arranged opposite to each other. The carrier layer 1 has a plurality of fine grid strips 12 that extend along a first direction X, and the plurality of fine grid strips 12 are spaced apart along a second direction Y that is perpendicular to the first direction X. There are metal strips 13 that do not extend through adjacent fine grid strips 12. Each fine grid strip 12 includes a plurality of grid holes 121 that extend through the carrier layer 1, and ink bridges 122 are formed between adjacent grid holes 121. The ink layer 2 includes ink line holes 22 that extend through the ink layer 2, and the ink line holes 22 are adapted to fit the fine grid strips 12. The ink line holes 22 extend along the first direction X, and the plurality of ink line holes 22 are spaced apart along the second direction Y. The ink line hole 22 is connected to the grid hole 121, and an ink bridge 122 is installed on the ink line hole 22. This strengthens the fine grid plate 100, increases its lifespan, improves ink application, enhances printing quality, and reduces costs.

[0034] In this embodiment, the grid hole 121 includes a fence hole 1211, which extends along the second direction Y. A plurality of fence holes 1211 are arranged at intervals along the first direction X, and an ink bridge 122 is formed between adjacent fence holes 1211.

[0035] In this embodiment, the metal strips 13 between adjacent fine grid strips 12 are continuously arranged, i.e., not penetrating through each other, and are not used for ink application. The metal strips 13 have flat surfaces and are not provided with other holes, grooves, lines, etc., that penetrate the bearing layer 1, to ensure the strength of the bearing layer 1 and the overall strength and toughness of the fine grid screen. In other embodiments, the metal strips 13 between adjacent fine grid strips 12 have non-flat surfaces, with raised or recessed structures to facilitate ink scraping printing on the printing surface 11.

[0036] In this embodiment, the length L of the gate hole 1211 ranges from 200 μm to 2000 μm, for example, 200 μm, 500 μm, 1000 μm, and 2000 μm. The width W1 of the gate hole 1211 ranges from 50 μm to 500 μm, for example, 50 μm, 80 μm, 120 μm, 300 μm, and 500 μm. Ink bridges 122 are formed between the gate holes 1211, and the width W2 of the ink bridges 122 ranges from 5 μm to 30 μm, for example, 5 μm, 10 μm, 20 μm, and 30 μm. The fine grid strip 12 has good strength and ink-feeding performance. The gate hole 1211 is generally elongated, with arc-shaped ends, forming an overall waist-shaped hole, thus possessing good structural strength. The two ends of the gate hole 1211 are arc-shaped, and the two sides of the end of the ink bridge 122 are formed as reinforcing parts 1221, which can strengthen the ink bridge 122 and ensure printing strength and quality. In other embodiments, such as... Figure 9 In Figure 10, the two ends of the fence hole 1212 are chamfered, and the two ends of the fence hole 1213 are set as right angles. The shape of the fence hole 1213 is rectangular.

[0037] In this embodiment, the ink line holes 22 extend continuously along the first direction X and are spaced apart along the second direction Y, which is perpendicular to the first direction X. Along the first direction X, the center line of the fine grid strip 12 coincides with the center line of the ink line holes 22. The fence holes 1211 extend along the second direction Y, perpendicularly intersecting and communicating with the ink line holes 22. The length of the ink line holes 22 is less than the distribution length of the fine grid strip 12, and two fence holes 1211 at each end of the fine grid strip 12 are not correspondingly intersecting and communicating with the ink line 22. The ink line holes 22 extend to a third fence hole 1211 and communicate with it, ensuring smooth ink flow and printing quality. The width W3 of the ink line holes 22 ranges from 3 μm to 150 μm, for example, 3 μm, 9 μm, 20 μm, 80 μm, and 150 μm. The width of the ink line hole 22 is smaller than the length of the fence hole 1211. The ink line hole 22 is continuously connected along the first direction X, and the ink line hole 22 is connected to the fence hole 1211 to ensure ink flow. The end of the ink line 22 is also chamfered or rounded to enhance strength and improve ink flow.

[0038] In this embodiment, the carrier layer 1 and the ink layer 2 are stacked in layers, wherein the carrier layer 1 is a nickel layer and the ink layer 2 is a PI layer composited with the nickel layer. In other embodiments, the carrier layer 1 is a nickel alloy layer and the ink layer 2 is a nickel layer or a nickel alloy layer. In other embodiments, the carrier layer 1 and the ink layer 2 are integrally formed; the carrier layer 1 and the ink layer 2 can be formed simultaneously or separately but integrated without a dividing interface.

[0039] Please refer to Figure 11, which shows another schematic diagram of the grid hole 121 of the fine grid plate of this utility model. The grid hole 121 includes a plurality of grid holes 1214 arranged in a cross pattern, and the grid lines between adjacent grid holes 1214 form ink bridges 1222. The grid holes 1214 are polygonal, including rectangles, triangles, irregular quadrilaterals, etc.

[0040] Please refer to Figure 12, which is another schematic diagram of the grid holes 121 of the fine grid plate of this utility model. The grid holes 121 include a plurality of grid holes 1215 arranged in a cross pattern, and the grid lines between adjacent grid holes 1215 form ink bridges 1223. The grid holes 1215 are hexagonal and distributed in a honeycomb pattern, and the grid holes 1215 at their edges are polygonal.

[0041] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail above with reference to the accompanying drawings. Many specific details are set forth in the above description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are 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.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fine grid screen, characterized in that, It includes a carrier layer and an ink-absorbing layer stacked together. The carrier layer has a printing surface, and the ink-absorbing layer has a printing surface, with the printing surface and the printing surface facing each other. The carrier layer has a plurality of fine grid strips that extend along a first direction, and the fine grid strips are spaced apart along a second direction that intersects the first direction. There are metal strips that do not extend between adjacent fine grid strips. Each fine grid strip includes a plurality of grid holes that extend through the carrier layer, and ink bridges are formed between adjacent grid holes. The ink-absorbing layer includes ink-absorbing line holes that extend through the ink-absorbing layer. The ink-absorbing line holes are adapted to fit the fine grid strips and communicate with the grid holes. The ink bridges are mounted on the ink-absorbing line holes.

2. The fine grid plate according to claim 1, characterized in that, The grid holes include fence holes, which extend along a second direction. A plurality of the fence holes are arranged at intervals along a first direction, and the ink bridge is formed between adjacent fence holes. The length of the fence hole ranges from 200μm to 2000μm, the width of the fence hole ranges from 50μm to 500μm, and the width of the ink bridge ranges from 5μm to 30μm.

3. The fine grid plate according to claim 2, characterized in that, The fence openings are elongated, and their ends are either right-angled, chamfered, or arc-shaped.

4. The fine grid plate according to claim 1, characterized in that, The grid holes include mesh holes, and the mesh lines between adjacent mesh holes form ink bridges. The diameter of the mesh holes ranges from 50μm to 500μm, and the width of the ink bridges ranges from 5μm to 30μm.

5. The fine grid plate according to claim 1, characterized in that, The length of the ink line hole is less than the distribution length of the fine grid strips.

6. The fine grid plate according to claim 1, characterized in that, The width of the ink line hole ranges from 3μm to 150μm.

7. The fine grid screen according to claim 1, characterized in that, The carrier layer and the ink layer are stacked in layers, or the carrier layer and the ink layer are integrally formed.

8. The fine grid plate according to claim 1, characterized in that, The carrier layer is a nickel layer or a nickel alloy layer, and the ink layer is a nickel layer, a nickel alloy layer, or a polymer layer.

9. A screen printing component, characterized in that, It includes a main grid version and a fine grid version as described in any one of claims 1 to 8.

10. A solar cell, characterized in that, It includes a semiconductor substrate and an electrode structure disposed on the semiconductor substrate, the electrode structure including a main gate electrode and a fine gate electrode formed by printing using the screen printing assembly as described in claim 9.

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