A grid line printing stencil for a solar cell

Abstract

The present invention discloses a grid printing screen for solar cell wafers, comprising a grid structure for printing grid lines; and a frame structure detachably connected to the grid structure, for the grid structure to be arranged on printing equipment through the frame structure; wherein, the grid structure includes an annular border and a wire mesh wound and fixed on the annular border at the edge part; the frame structure is an annular frame structure; the grid structure is detachably arranged in the inner ring of the frame structure through the annular border; and when the grid structure is arranged on the frame structure, the wire mesh of the grid structure faces the inner ring of the frame structure. In the printing screen of the present application, the grid structure and the frame structure are detachably connected. When the grid structure needs to be replaced, only the grid structure needs to be removed from the frame structure and a new grid structure is replaced, thus avoiding the problem of repositioning the screen when updating the grid structure, and further improving the grid line printing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell manufacturing, and particularly to a grid printing stencil for solar cells. Background Art

[0002] Solar cells can convert light energy into electrical energy and output the electrical energy for use. The electrical energy generated by solar cells is mainly collected through the grids on the surface of the cells and then transmitted to the solder tape through the main grids for final output. The grids on the surface of solar cells are densely arranged and slender. Therefore, usually, the grids are formed on the surface of the cells by screen printing.

[0003] Currently, the conventional stencils for printing grids on the surface of solar cells mainly include an annular frame structure and a screen structure; the edge of the screen structure is fixedly connected to the frame structure, and a planar grid structure is stretched in the inner ring of the frame structure. During actual printing, the printing equipment fixes and positions the frame structure so that the screen structure covers the cells, and then forms grids by printing paste on the screen structure.

[0004] However, during the actual printing process, when problems such as plate bursting and serious slurry leakage occur during printing, it is necessary to immediately replace the new stencil for normal screen printing. However, after replacing the stencil, it is necessary to re-align and position the stencil, which is time-consuming and laborious and affects the printing efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a grid printing stencil for solar cells, which simplifies the difficulty of stencil replacement and improves the printing efficiency.

[0006] To solve the above technical problems, the present invention provides a grid printing stencil for solar cells, including:

[0007] A grid structure for printing grids;

[0008] A frame structure detachably connected to the grid structure, for the grid structure to be arranged on the printing equipment through the frame structure;

[0009] Wherein, the grid structure includes an annular frame and a screen wound and fixed on the annular frame at the edge part; the frame structure is an annular frame structure; the grid structure is detachably arranged on the frame structure through the annular frame; and when the grid structure is arranged on the frame structure, the screen of the grid structure faces the inner ring of the frame structure.

[0010] In an alternative embodiment of the present application, the frame structure is a rectangular structure formed by three first side frames and one second side frame. The lower surfaces of the three first side frames are flush, and the lower surface of the second side frame is recessed relative to the lower surfaces of the first side frames, forming a recessed notch on the lower surface of the frame structure.

[0011] Wherein, a strip-shaped chute parallel to the length direction of the first side frame is provided on the inner side of each first side frame, and a strip-shaped protrusion matching the strip-shaped chute is provided on the outer peripheral part of the annular frame of the grid structure; the grid structure can push the strip-shaped protrusion into the strip-shaped chute through the recessed notch.

[0012] In an alternative embodiment of the present application, at the end of the first side frame connected to the second side frame, there is a scale line for detecting the position where the grid structure is pushed into the frame structure.

[0013] In an alternative embodiment of the present application, a first through hole and a plug that can be inserted into the first through hole are provided on the first side frame; a second through hole with the same aperture size as the first through hole is provided on the annular frame of the grid structure;

[0014] When the grid structure is arranged on the frame structure, the first through hole is aligned with the second through hole, and the plug penetrates and inserts into the first through hole and the second through hole.

[0015] In an alternative embodiment of the present application, the inner diameter of the inner ring side wall above the strip-shaped chute in the frame structure is not greater than the inner diameter of the annular frame.

[0016] In an alternative embodiment of the present application, the frame structure is a metal frame.

[0017] A grid plate for printing grid lines of a solar cell provided by the present invention includes a grid structure for printing grid lines; a frame structure detachably connected to the grid structure, for arranging the grid structure on a printing device through the frame structure; wherein, the grid structure includes an annular frame and a wire mesh wound and fixed on the annular frame at the edge part; the frame structure is an annular frame structure; the grid structure is detachably arranged in the inner ring of the frame structure through the annular frame; and when the grid structure is arranged on the frame structure, the wire mesh of the grid structure faces the inner ring of the frame structure.

[0018] In the printing stencil of the present application, the grid structure and the frame structure are detachably connected. During the actual printing process, the printing equipment aligns the grid structure by positioning and aligning the frame structure; when the grid structure needs to be replaced, only the grid structure needs to be removed from the frame structure and a new grid structure is replaced, and the fixed relationship and position between the printing equipment and the frame structure do not move, because the connection position of the grid structure on the frame structure is determined and there is no problem of alignment and positioning, thus avoiding the problem of repositioning the stencil when the grid structure is updated, and further improving the grid line printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the grid line printing stencil of the solar cell provided by the embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the frame structure provided by the embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the grid structure provided by the embodiment of the present application;

[0023] Figure 4 It is an installation schematic diagram of the grid structure and the frame structure provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The core of the present invention is to provide a grid line printing stencil for solar cells. By detachably connecting the grid structure and the frame structure in the stencil, when replacing the grid structure, the positioning position of the frame structure is not changed, and only the grid structure is replaced, avoiding the problem of repositioning after updating the grid structure, simplifying the procedure for replacing the grid structure, and improving the printing efficiency.

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the following will further elaborate on the present invention in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] Such as Figure 1 、Figure 2 and Figure 3 as shown Figure 1 is a schematic structural view of a grid printing screen for a solar cell provided in an embodiment of the present application, Figure 2 is a schematic view of a frame structure provided in an embodiment of the present application, Figure 3 is a schematic view of a grid structure provided in an embodiment of the present application. The printing screen may include:

[0027] a grid structure 1 for printing grid lines;

[0028] a frame structure 2 detachably connected to the grid structure 1 for the grid structure 1 to be arranged on a printing device through the frame structure 2;

[0029] wherein, the grid structure 1 includes an annular frame 12 and a wire mesh 11 whose edge part is wound and fixed on the annular frame 12; the frame structure 2 is an annular frame structure; the grid structure 1 is detachably arranged in the inner ring of the frame structure 2 through the annular frame 12; and when the grid structure 1 is arranged on the frame structure 2, the wire mesh 11 of the grid structure 1 faces the inner ring of the frame structure 2.

[0030] Optionally, for the frame structure 2, a metal frame structure may be adopted.

[0031] Specifically, during actual printing, the grid structure 1 is arranged on the frame structure 2, and the wire mesh 11 in the grid structure 1 faces the inside of the ring of the frame structure 2. The frame structure 2 is installed on a printing device, and the printing device drives the screen to move to achieve the alignment of the grid structure 1 and the solar cell.

[0032] When the grid structure 1 is damaged and needs to be replaced during the printing process, since the grid structure 1 and the frame structure 2 in this embodiment are detachably installed. Therefore, when the grid structure 1 is damaged, the grid structure 1 can be detached from the frame structure 2, and a new grid structure 1 can be installed on the frame structure 2. Since the installation position of the grid structure 1 on the frame structure 2 is fixed and no complex alignment is required, the installation procedure of the grid structure 1 is simplified.

[0033] In the existing printing screens in the prior art, generally, the edge of the wire mesh is directly wound around the frame structure. In actual application, the printing screen is installed by installing the frame structure on a printing device. If the wire mesh is damaged, the printing device needs to be moved away from the printing position, and the entire printing screen needs to be removed from the printing device. After replacing the new printing screen, the printing position of the printing screen needs to be repositioned through the printing device.

[0034] Compared with the prior art, in the present application, the screen 11 is fixed on the annular frame 12, and together with the annular frame 12, a grid structure 1 is formed. Among them, the structure of the annular frame 12 is smaller and thinner relative to the frame structure 2, as long as it can support the screen 11 into a planar structure; when the grid structure 1 is installed on the frame structure 2, it is realized by detachably arranging the annular frame 12 on the frame structure 2. When replacing the new grid structure 1 of the printing screen plate, there is no need to move the printing equipment, but directly replace the grid structure 1 on the frame structure 2 while keeping the printing equipment stationary, which simplifies the positioning operation during the replacement of the grid structure 1; in addition, in the prior art, the entire printing screen plate needs to be replaced when replacing the grid, while in the present application, by using the split structure of the grid structure 1 and the frame structure 2, only the grid structure 1 part is replaced, which greatly improves the utilization rate of the frame structure 2 and thus reduces the use cost of the printing screen plate.

[0035] In summary, in the present application, by installing the grid structure 1 and the frame structure 2 in a detachable split structure, when the grid structure 1 is damaged during printing, only the grid structure 1 on the frame structure 2 needs to be replaced, and there is no need to move the entire printing equipment to replace the printing screen plate, avoiding the operation of re-aligning the printing screen plate after replacing the grid structure 1, simplifying the grid line printing difficulty of the solar cell, and improving the printing efficiency; and the frame structure 2 can be reused, which is beneficial to reducing the use cost of the printing screen plate.

[0036] Optionally, in another specific embodiment of the present application, the frame structure may specifically include:

[0037] The frame structure 2 is a rectangular structure formed by three first frames 21 and one second frame 22. The lower surfaces of the three first frames 21 are flush, and the lower surface of the second frame 22 is recessed relative to the lower surfaces of the first frames 21, forming a recessed notch on the lower surface of the frame structure 2;

[0038] Among them, a strip-shaped chute 23 parallel to the length direction of the first frame 21 is provided on the inner side of each first frame 21, and a strip-shaped protrusion matching the strip-shaped chute 23 is provided on the outer peripheral part of the annular frame of the grid structure 1; the grid structure 1 can push the strip-shaped protrusion into the strip-shaped chute 23 through the recessed notch.

[0039] During actual printing, the frame structure 2 is generally placed horizontally, and the solar cell is placed below the frame structure 2. As Figure 2As shown in the figure, the three first side frames 21 of the frame structure 2 have the same thickness, while the thickness of one second side frame 22 is less than that of the first side frame 21, so that a recessed notch is formed at the bottom on one side of the second side frame 22 of the frame structure 2. And there is a strip-shaped chute 23 on the first side frame 21 and on the same plane as the recessed notch. Correspondingly, there is a strip-shaped protrusion on the outer peripheral part of the annular side frame 12 of the grid structure 1. Thus, as Figure 4 shown, Figure 4 is the installation schematic diagram of the grid structure and the frame structure provided by the embodiment of the present application. Figure 4 In it, the grid structure 1 can be horizontally inserted into the frame structure 2 through the recessed notch, and the strip-shaped protrusion of the grid structure 1 slides into the strip-shaped chute 23. Figure 4 The arrow direction in it is also the direction in which the grid structure 1 can slide relative to the frame structure 2.

[0040] Through Figure 4 it can be seen that the grid structure 1 in this embodiment can be installed on the frame structure 2 by horizontal sliding. Further, when replacing the grid structure 1, the problem that components such as the printed brush above the frame structure 2 need to be removed due to obstacles is avoided, and further simplifies the installation difficulty of the grid structure 1.

[0041] Furthermore, in another optional embodiment of the present application, it may further include:

[0042] On the first side frame 21 of the frame structure 2, at the end connected to the second side frame 22, there is a scale line for detecting the position where the grid structure 1 is pushed into the frame structure 2.

[0043] Considering that in practical applications, there are various specifications for the grid structure 1, and there are differences in the sizes of each specification of the grid structure 1. Correspondingly, there are also differences in the positions where different specifications of the grid structure 1 are pushed into the frame structure 2. Thus, a scale line can be set on the first side frame 21, and it is judged whether the grid structure 1 is pushed into the correct position by comparing whether the edge of the grid structure 1 is flush with the scale line.

[0044] Of course, in addition to this, other methods can also be used to position the position where the grid structure 1 is pushed into the frame structure 2. Specifically, in another specific embodiment of the present application, it may further include:

[0045] There is a first through hole 211 on the first side frame 21 of the frame structure 2, and a pin 212 that can be inserted into the first through hole 211; there is a second through hole 121 with the same aperture size as the first through hole 211 on the annular side frame 12 of the grid structure 1.

[0046] Because when the grid structure 1 is installed on the frame structure 2, the annular border 12 of the grid structure 1 is inserted into the first border 21. Therefore, a first through hole 211 and a second through hole 121 can be respectively provided on the first border 21 and the annular border 12. Only when the position where the grid structure 1 is pushed in exactly reaches the predetermined position, the first through hole 211 will exactly align with the second through hole 121, and the bolt 212 can simultaneously penetrate and insert into the first through hole 211 and the second through hole 121, which can not only realize the relative positioning of the grid structure 1 and the frame structure 2, but also ensure that the grid structure 1 will not shift during the printing process.

[0047] In another optional embodiment of the present application, it may further include:

[0048] The inner diameter of the inner ring side wall above the strip-shaped chute 23 in the frame structure 2 is not greater than the inner diameter of the annular border 12.

[0049] As Figure 1 shown, after the grid structure 1 is installed on the frame structure 2, the part of the frame structure 2 above the grid structure 1 covers the annular border 12 of the grid structure 1, and only the wire mesh part is exposed in the inner ring of the frame structure 2. Because a large number of grooves are often required to be provided on the annular border 12 of the grid structure 1 for fixing the edge of the wire mesh 11, and during actual printing, the excess slurry on the grid structure 1 may accumulate at the edge position of the grid structure 1. If the grid structure 1 is exposed outside, it is very likely that the grooves in the annular border 12 will be filled with slurry that is difficult to clean. Therefore, the frame structure 2 in the present application can well reduce the cleaning difficulty of the grid structure 1, and moreover, the part of the frame structure 2 above the grid structure 1 can also prevent the slurry from flowing out, causing unnecessary waste of the slurry.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes the inherent elements thereof. Without more limitations, the element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. In addition, the parts of the above technical solutions provided by the embodiments of the present application that are consistent with the corresponding technical solutions in the prior art in terms of implementation principles are not described in detail to avoid excessive elaboration.

[0051] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principles of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A grid printing stencil for a solar cell chip, characterized in that, it includes: a grid structure for printing grid lines; and a frame structure detachably connected to the grid structure, for the grid structure to be arranged on a printing device through the frame structure; wherein, the grid structure includes an annular border and a wire mesh wound and fixed on the annular border at the edge part; the frame structure is an annular frame structure; the grid structure is detachably arranged on the frame structure through the annular border; and when the grid structure is arranged on the frame structure, the wire mesh of the grid structure faces the inner ring of the frame structure; the frame structure is a rectangular structure formed by three first borders and one second border, the lower surfaces of the three first borders are flush, and the lower surface of the second border is recessed relative to the lower surfaces of the first borders, forming a recessed notch on the lower surface of the frame structure; wherein, a strip-shaped chute parallel to the length direction of the first border is arranged on the inner side of each first border, and a strip-shaped protrusion matching the strip-shaped chute is arranged on the outer peripheral part of the annular border of the grid structure; the grid structure can push the strip-shaped protrusion into the strip-shaped chute through the recessed notch; at the end of the first border connected to the second border, a scale line is provided for detecting the position where the grid structure is pushed into the frame structure; the inner diameter of the inner ring side wall above the strip-shaped chute in the frame structure is not greater than the inner diameter of the annular border.

2. The grid printing stencil for a solar cell chip according to claim 1, characterized in that, a first through hole and a pin that can be inserted into the first through hole are arranged on the first border; a second through hole with the same aperture size as the first through hole is arranged on the annular border of the grid structure; when the grid structure is arranged on the frame structure, the first through hole is aligned with the second through hole, and the pin penetrates and inserts into the first through hole and the second through hole.

3. The grid printing stencil for a solar cell chip according to claim 1, characterized in that, the frame structure is a metal frame.

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