Screen printing mechanism

Abstract

The utility model relates to a silk-screen printing mechanism which comprises a first silk-screen printing plate used for printing solder paste and a second silk-screen printing plate used for printing insulation paste. The first silk-screen printing plate is provided with a plurality of first silk-screen areas. The second silk-screen printing plate is provided with a plurality of second silk-screen areas. When the first silk-screen printing plate and the second silk-screen printing plate are overlapped, the plurality of second silk-screen areas are in one-to-one correspondence with the plurality of first silk-screen areas, and each second silk-screen area surrounds the outer side of the corresponding first silk-screen area; the minimum distance between the first silk screen area and the corresponding second silk screen area is 0.1 mm-1 mm. When the silk-screen printing mechanism is used for printing the solder paste and the insulating paste, the risk of insufficient soldering or welding tension reduction caused by spreading of the solder paste can be reduced, and meanwhile, short circuit caused by the fact that the solder paste overflows out of the insulating paste can be avoided.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and particularly to a screen printing mechanism. Background Art

[0002] During the interconnection process from solar cells to photovoltaic modules, the solder tapes are welded to the solder joints, and the positive and negative grid lines are located under the solder tapes. In order to avoid short - circuit between the positive and negative electrodes, an insulating glue needs to be printed between the solder tapes and the grid lines. After printing the insulating glue, there will be a certain height difference between the solder joints and the insulating glue. Therefore, a layer of solder paste is printed on the solder joints before welding, and then the solder tapes are welded. After the solder paste is printed, it is easy to spread on the copper solder joints, resulting in insufficient height of the solder paste, causing false soldering or reduced welding tensile force; if only the amount of solder paste is increased to make up for the height difference caused by wetting, the solder paste may overflow outside the insulating glue, causing battery short - circuit. Therefore, it is necessary to carry out a matching design for the insulating glue screen printing stencil and the solder paste screen printing stencil. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a screen printing mechanism for printing solder paste and insulating glue respectively. Using the screen printing mechanism of the present application for printing solder paste and insulating glue can reduce the risk of false soldering or reduced welding tensile force caused by the spread of solder paste, and at the same time can also avoid short - circuit caused by the solder paste overflowing outside the insulating glue.

[0004] The present application provides a screen printing mechanism, including: a first screen printing stencil for printing solder paste and a second screen printing stencil for printing insulating glue;

[0005] A plurality of first screen areas are provided on the first screen printing stencil;

[0006] The second screen printing stencil has a plurality of second screen areas;

[0007] When the first screen printing stencil and the second screen printing stencil are overlapped and placed, a plurality of the second screen areas correspond to a plurality of the first screen areas one by one, and each of the second screen areas surrounds the corresponding first screen area on the outside; the minimum distance between the first screen area and its corresponding second screen area is 0.1 mm to 1 mm.

[0008] In some embodiments, the opening shape of the first screen area is at least one of a circle, an ellipse, a square, and a trapezoid.

[0009] In some embodiments, a plurality of the first screen areas are distributed in a matrix.

[0010] In some embodiments, a plurality of the first screen areas are equally spaced.

[0011] In some of these embodiments, the multiple second screen regions are distributed in a matrix pattern.

[0012] In some of these embodiments, the multiple second screen regions are equally spaced.

[0013] In some of these embodiments, the opening shape of the second screen region is a square ring.

[0014] In some of these embodiments, the geometric center of the first screen region coincides with the geometric center of the corresponding second screen region.

[0015] In some of these embodiments, the thickness of the first screen printing stencil is greater than or equal to the thickness of the second screen printing stencil.

[0016] In some of these embodiments, the thickness of the first screen printing stencil is 40 μm to 100 μm.

[0017] The above screen printing mechanism includes a first screen printing stencil for printing solder paste and a second screen printing stencil for printing insulating glue. During use, insulating glue can be printed through the second screen printing stencil, and multiple insulating glues are printed through each second screen region. Each second screen region corresponds to printing one portion of insulating glue for surrounding the solder joints. Then, solder paste is printed through the multiple first screen regions provided on the first screen printing stencil, and each first screen region corresponds to printing one portion of solder paste at the solder joint. When printing the solder paste, it is necessary to place each first screen region within the inner region of the insulating glue printed through each second screen region. Since the minimum distance between the first screen region and the corresponding second screen region is 0.1 mm to 1 mm, within the above distance range, it can be ensured that during the printing process of the solder paste, the risk of false soldering caused by spreading can be reduced, and at the same time, it can be ensured that the solder paste will not overflow outside the insulating glue to cause a short circuit. Using the screen printing mechanism of the present application to print solder paste and insulating glue can reduce the risk of false soldering or reduced welding tensile force caused by the spreading of the solder paste, and at the same time, it can also avoid the short circuit caused by the solder paste overflowing outside the insulating glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the first screen printing stencil provided by an embodiment of the present application;

[0019] Figure 2 Schematic diagram of the structure of the second screen printing stencil provided by an embodiment of the present application;

[0020] Figure 3 Schematic diagram of the overlapping structure of the first screen printing stencil and the second screen printing stencil in the present application;

[0021] Figure 4This is a partially enlarged schematic structural diagram of the overlap between the first screen printing stencil and the second screen printing stencil in this application.

[0022] Description of Reference Numerals

[0023] 10. First screen printing stencil; 11. First screen area; 20. Second screen printing stencil; 21. Second screen area. Detailed Implementation Modes

[0024] To make the above objects, features, and advantages of this application more obvious and understandable, the following provides a detailed description of the specific implementation modes of this application. Many specific details are set forth in the following description to facilitate a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0026] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In this application, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Referring to Figures 1 - 2 As shown, an embodiment of the present application provides a screen printing mechanism, including: a first screen printing stencil 10 for printing solder paste and a second screen printing stencil 20 for printing insulating glue. A plurality of first screen areas 11 are formed on the first screen printing stencil 10. The second screen printing stencil 20 has a plurality of second screen areas 21. Referring to Figures 3 - 4 As shown, when the first screen printing stencil 10 and the second screen printing stencil 20 are overlapped and placed, the plurality of second screen areas 21 correspond to the plurality of first screen areas 11 one by one, and each second screen area 21 surrounds the outside of the corresponding first screen area 11; the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 0.1 mm to 1 mm.

[0030] The above screen printing mechanism includes a first screen printing stencil 10 for printing solder paste and a second screen printing stencil 20 for printing insulating glue. During use, insulating glue can be printed through the second screen printing stencil 20, and a plurality of insulating glues are printed through each second screen area 21, and each second screen area 21 correspondingly prints an insulating glue for surrounding the solder joint. Then, solder paste is printed through the plurality of first screen areas 11 formed on the first screen printing stencil 10, and each first screen area 11 correspondingly prints the solder paste at a solder joint. When printing the solder paste, it is necessary to place each first screen area 11 within the inner area of the insulating glue printed through each second screen area 21, and the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 0.1 mm to 1 mm. Exemplarily, referring to Figure 4 As shown, Figure 4 in Figure a, a is the minimum distance between the first screen area 11 and the second screen area 21 closest to it. Within the above distance range, during the printing process of the solder paste, it can not only reduce the risk of false soldering caused by spreading, but also ensure that the solder paste will not overflow outside the insulating glue to cause a short circuit. Using the screen printing mechanism of the present application to print solder paste and insulating glue can reduce the risk of false soldering or reduced welding tensile force caused by the spreading of the solder paste, and at the same time can avoid the short circuit caused by the solder paste overflowing outside the insulating glue.

[0031] It can be understood that the second screen printing stencil 20 in the present application is used to print the insulating glue around the solder joints, and the grid line insulating glue can be printed through other screen printing stencils. The printing morphology of the grid line insulating glue is not limited in the present application. It can be understood that at least one of the commonly used screens in the art is present in both the first screen area 11 and the second screen area 21. The screen is a woven fabric used as a support for the screen printing plate, and it can allow the printing material to pass through the first screen area 11 and the second screen area 21 for printing.

[0032] Optionally, the minimum distance between the first screen area 11 and the second screen area 21 closest to it is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. Alternatively, the minimum distance between the first screen area 11 and the second screen area 21 closest to it can also be within the range between any two of the above distances.

[0033] In some embodiments, the opening shape of the first screen area 11 is at least one of a circle, an ellipse, a square, and a trapezoid.

[0034] In some embodiments, the opening shape of the first screen area 11 is a rectangle.

[0035] In some embodiments, the side length of the opening of the first screen area 11 is 0.05 mm to 10 mm.

[0036] Optionally, the side length of the opening of the first screen area 11 is 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. Alternatively, the side length of the opening of the first screen area 11 can also be within the range between any two of the above lengths.

[0037] In some embodiments, the multiple first screen areas 11 are arranged in a matrix distribution.

[0038] In some embodiments, the multiple first screen areas 11 are arranged in a determinant distribution.

[0039] Exemplarily, the multiple first screen areas 11 are arranged in a determinant distribution of 2×2, 3×3, 4×4, 5×5, 6×6, 7×7, 8×8, 9×9, or 10×10.

[0040] In some embodiments, the multiple first screen areas 11 are equally spaced.

[0041] In some of these embodiments, the multiple second screen regions 21 are distributed in a matrix pattern.

[0042] In some of these embodiments, the multiple second screen regions 21 are distributed in a determinant pattern.

[0043] In some of these embodiments, the multiple second screen regions 21 are equally spaced.

[0044] Exemplarily, the multiple second screen regions 21 are distributed in a determinant pattern of 2×2, 3×3, 4×4, 5×5, 6×6, 7×7, 8×8, 9×9, or 10×10.

[0045] In some of these embodiments, the opening shape of the second screen region 21 is a square ring.

[0046] It can be understood that a square ring refers to a hollow square, that is, the remaining part after subtracting a small square from a large square.

[0047] In some of these embodiments, the geometric center of the first screen region 11 coincides with the geometric center of the corresponding second screen region 21.

[0048] In some of these embodiments, the second screen region 21 is in a zigzag shape.

[0049] In some of these embodiments, the thickness of the first screen printing stencil 10 is greater than or equal to the thickness of the second screen printing stencil 20.

[0050] In some of these embodiments, the thickness of the first screen printing stencil 10 is 40μm to 100μm.

[0051] Optionally, the thickness of the first screen printing stencil 10 is 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, or 100μm. Alternatively, the thickness of the first screen printing stencil 10 can also be within the range between any two of the above thicknesses.

[0052] In some of these embodiments, the thickness of the second screen printing stencil 20 is 39μm to 99μm.

[0053] Optionally, the thickness of the second screen printing stencil 20 is 39μm, 44μm, 49μm, 54μm, 59μm, 64μm, 69μm, 74μm, 79μm, 84μm, 89μm, 94μm, or 99μm. Alternatively, the thickness of the second screen printing stencil 20 can also be within the range between any two of the above thicknesses.

[0054] In some of these embodiments, a screen printing mechanism includes: a first screen printing stencil 10 for printing solder paste and a second screen printing stencil 20 for printing insulating glue. A plurality of first screen areas 11 are provided on the first screen printing stencil 10. The second screen printing stencil 20 has a plurality of second screen areas 21. When the first screen printing stencil 10 and the second screen printing stencil 20 are overlapped and placed, the plurality of second screen areas 21 correspond to the plurality of first screen areas 11 one by one, and each second screen area 21 surrounds the outside of the corresponding first screen area 11; the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 0.1 mm to 1 mm. The opening shape of the first screen area 11 is rectangular. The plurality of first screen areas 11 are arranged in an equidistant determinant distribution. The opening shape of the second screen area 21 is a square frame shape. The plurality of second screen areas 21 are arranged in an equidistant determinant distribution.

[0055] The following are specific embodiments

[0056] Embodiment 1

[0057] In this embodiment, the first screen printing stencil 10 is provided with first screen areas 11 arranged in a 6×6 equidistant determinant distribution. The opening shape of the first screen area 11 is rectangular, and its dimensions are 2.7 mm in length and 2.2 mm in width.

[0058] The second screen printing stencil 20 has second screen areas 21 arranged in a 6×6 equidistant determinant distribution. When the first screen printing stencil 10 and the second screen printing stencil 20 are overlapped and placed, the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 0.8 mm.

[0059] Comparative Example 1

[0060] In Comparative Example 1, the second screen printing stencil 20 is the same as the second screen printing stencil 20 in Embodiment 1. In Comparative Example 1, the dimensions of the first screen area 11 on the first screen printing stencil 10 are 2 mm in length and 1.5 mm in width, that is, the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 1.5 mm.

[0061] Comparative Example 2

[0062] In Comparative Example 2, the second screen printing stencil 20 is the same as the second screen printing stencil 20 in Embodiment 1. In Comparative Example 2, the dimensions of the first screen area 11 on the first screen printing stencil 10 are 3.45 mm in length and 2.95 mm in width, that is, the minimum distance between the first screen area 11 and its corresponding second screen area 21 is 0.05 mm.

[0063] Use the screen printing mechanisms in Example 1, Comparative Example 1, and Comparative Example 2 to print the insulating glue and solder paste respectively. Test 100 samples in each group, and respectively count the maximum value, minimum value, and average value of the solder joint tensile strength test, and count the cases of solder bridging and short circuit. The experimental results obtained are shown in Table 1 below:

[0064] Table 1

[0065]

[0066] As can be seen from Table 1 above, using the screen printing mechanism in the embodiment of the present application to print the insulating glue and solder paste can control the printing size of the insulating glue and solder paste within a certain range of 0.1 mm to 1 mm, which not only improves the solder joint tensile strength of the solder paste, but also can suppress the problems of solder bridging and short circuit.

[0067] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0068] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims, and the description and drawings can be used to explain the content of the claims.

Claims

1. A screen printing mechanism, characterized in that, Including: A first screen printing stencil (10) for printing solder paste and a second screen printing stencil (20) for printing insulating glue; A plurality of first screen areas (11) are provided on the first screen printing stencil (10); The second screen printing stencil (20) has a plurality of second screen areas (21); When the first screen printing stencil (10) and the second screen printing stencil (20) are overlapped and placed, the plurality of second screen areas (21) correspond to the plurality of first screen areas (11) one by one, and each second screen area (21) surrounds the corresponding first screen area (11) on the outside; The minimum distance between the first screen area (11) and its corresponding second screen area (21) is 0.1 mm to 1 mm.

2. The screen printing mechanism according to claim 1, wherein, The opening shape of the first screen area (11) is at least one of circular, oval, square and trapezoidal.

3. The screen printing mechanism according to claim 2, wherein The plurality of first screen areas (11) are arranged in a matrix.

4. The screen printing mechanism according to claim 3, characterized in that, The plurality of first screen areas (11) are equally spaced.

5. The screen printing mechanism according to claim 1, characterized in that, The plurality of second screen areas (21) are arranged in a matrix.

6. The screen printing mechanism according to claim 5, wherein The plurality of second screen areas (21) are equally spaced.

7. The screen printing mechanism according to any one of claims 1 to 6, characterized in that, The opening shape of the second screen area (21) is a square ring.

8. The screen printing mechanism according to any one of claims 1 to 6, characterized in that, The geometric center of the first screen area (11) coincides with the geometric center of its corresponding second screen area (21).

9. The screen printing mechanism according to any one of claims 1 to 6, characterized in that, The thickness of the first screen printing stencil (10) is greater than or equal to the thickness of the second screen printing stencil (20).

10. The screen printing mechanism according to any one of claims 1 to 6, characterized in that, The thickness of the first screen printing stencil (10) is 40 μm to 100 μm.

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