CN214821750U - Matched printing screen and solar cell - Google Patents
Matched printing screen and solar cell Download PDFInfo
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- CN214821750U CN214821750U CN202120544465.9U CN202120544465U CN214821750U CN 214821750 U CN214821750 U CN 214821750U CN 202120544465 U CN202120544465 U CN 202120544465U CN 214821750 U CN214821750 U CN 214821750U
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Abstract
The embodiment of the application provides a matched printing screen and a solar cell, and relates to the field of solar cell manufacturing. The grid line screen printing plate comprises a plurality of main grid printing lines and a plurality of fine grid printing lines which are parallel to each other, wherein the main grid printing lines and the fine grid printing lines are intersected and provided with a plurality of intersections. The matched printing screen plate comprises a matched welding spot screen plate and the grid line screen plate, the welding spot screen plate is provided with a plurality of first bonding pads which are dispersedly arranged, and after the grid line screen plate and the welding spot screen plate are configured to be aligned, each first bonding pad can cover a main grid printing line in the grid line screen plate. The matched printing screen plate and the solar cell are designed by arranging the main grid printing line and the fine grid printing line on the same screen plate, so that the effective lap joint between the main grid and the fine grid obtained by printing is ensured, the original gradual change design is omitted, and the consumption of slurry during printing is reduced.
Description
Technical Field
The application relates to the field of solar cell manufacturing, in particular to a matched printing screen and a solar cell.
Background
At present, overprinting is mainly adopted for front printing of multi-main-grid solar Cell products, such as PERC (Passivated Emitter and back Cell structure), Topcon (tunneling oxidation passivation contact Cell), HIT (crystalline silicon heterojunction solar Cell) and the like. In general, the main grid and the fine grid are respectively printed by adopting different original layouts, wherein the fine grid layout for printing the fine grid line is matched with the burn-through type silver paste to print the fine grid to form ohmic contact, the main grid layout for printing the main grid line is matched with the non-burn-through type silver paste to print the main grid, and the main grid collects current of the fine grid, so that the welding tension of the battery and the performance of the battery are obtained simultaneously.
As shown in fig. 1 to 3, in an original main gate layout 10, horizontally arranged gradient printing lines 12 are arranged at intervals on a vertically arranged main gate printing line 11, the original main gate layout 10 is further provided with a soldering pad 13, a fine gate printing line 21 in an original fine gate layout 20 is horizontally arranged, when overprinting is performed, the original main gate layout 10 is firstly used for printing a main gate line 40 containing a gradient line 60 and a soldering point 70, then the original fine gate layout 20 is used for printing a fine gate line 30, and whether overprinting is accurate is determined by a positive and negative linear array camera. Because there is a height difference in the crossing position of the thin gate line 30 and the main gate line 40 printed later, a broken gate occurs, that is, there is a notch 50 on the thin gate line, and the reason why the main gate line 40 must be provided with the gradual change line 60 is to fill the notch 50 on the thin gate line 30 and to realize effective lap joint between the main gate line 40 and the thin gate line 30 through the welding point 70 at the gradual change line 60, but the design of the gradual change line 60 inevitably increases silver paste consumption.
Referring to fig. 4, because the thin gate line 30 printed in the original layout does not penetrate through the main gate line 40, that is, the thin gate line 30 has the notch 50, once the camera precision is insufficient or the camera calibration is abnormal, a printing offset easily occurs in the vertical direction, that is, the gradual change line 60 on the main gate line 40 is offset from the notch 50 on the thin gate line 30 (the notch 50 is not filled up), so that the overlapping between the main gate line 40 and the thin gate line 30 is abnormal, and the current output is affected.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide a supporting printing half tone and solar cell, arrange the design on same half tone through main grid printing line and thin grid printing line, guarantee the effective overlap joint between the main grid that the printing obtained and thin grid, save original gradual change design moreover, reduce the thick liquids consumption when printing.
In a first aspect, an embodiment of the present application provides a grid line screen, where the grid line screen includes a plurality of main grid printing lines parallel to each other and a plurality of fine grid printing lines parallel to each other, and the main grid printing lines and the fine grid printing lines intersect each other and have a plurality of intersections.
In the implementation process, the main grid printing line for printing the main grid and the fine grid printing line for printing the fine grid are placed on the grid line screen, so that the main grid and the fine grid are printed simultaneously, and the phenomenon of grid breakage caused by height difference at the lap joint due to front and back printing of the main grid and the fine grid is avoided, therefore, the original gradual change design can be omitted, and the consumption of slurry during grid line printing is reduced. And the main grid and the fine grid are simultaneously printed through the main grid printing line and the fine grid printing line which are intersected, so that the effective overlapping between the main grid and the fine grid obtained by printing is ensured, the abnormal overlapping caused by overprinting offset of the main grid and the fine grid is greatly avoided, and the printing yield is improved.
In a second aspect, an embodiment of the present application provides a matching screen printing plate, which includes a matching welding spot screen printing plate and the grid line screen printing plate provided in the first aspect, where the welding spot screen printing plate has a plurality of first pads arranged dispersedly, and after the grid line screen printing plate and the welding spot screen printing plate are configured to be aligned, each first pad can cover a main grid printing line in the grid line screen printing plate.
In the implementation process, the grid line screen and the welding spot screen are adopted for overprinting, the grid line screen simultaneously prints the main grid and the fine grid, and the welding spot screen forms welding spots on the fine grid, so that the assembly welding effect is achieved; through the overprinting of the welding spot screen printing plate, the effective welding area can be ensured on the premise of not increasing the area of the original welding spot, so that the tension of the battery is ensured.
In a possible implementation manner, each main gate printing line is of a segmented structure, two ends of each main gate printing line are respectively provided with a fish fork line with an outward opening at intervals, the welding spot screen is further provided with a plurality of second bonding pads which are dispersedly arranged, and after the grid line screen and the welding spot screen are accurately aligned, each second bonding pad can cover an interval area between one fish fork line and the adjacent main gate printing line.
In the implementation process, the welding point formed by printing the second bonding pad can cover the interval area between the fish-spear line formed by screen printing the grid line and the adjacent main grid, so that the fish-spear opening is effectively overlapped with the main grid, and the main grid formed correspondingly can output current.
In a possible implementation manner, after the grid line screen and the welding spot screen are configured to be accurately aligned, the main grid printing line covered by the second bonding pad extends by 0.05mm to 0.15mm into the second bonding pad.
In the implementation process, the main grid formed by correspondingly printing the main grid printing line extends a certain distance into the welding point formed by correspondingly printing the second bonding pad, so that the accurate alignment of the overprinting of the grid line screen plate and the welding point screen plate can be ensured, and after the deviation within the allowable range (usually, the deviation occurs along the direction of the main grid printing line), the welding point formed by the second bonding pad can still be connected with the fish fork opening and the main grid, thereby ensuring the effective lap joint of the fish fork opening and the main grid.
In one possible implementation manner, the first bonding pad is rectangular, the length of the first bonding pad is 0.5 mm-1.5 mm, and the width of the first bonding pad is 0.5 mm-1 mm; the second bonding pad is rectangular, the length of the second bonding pad is 0.5 mm-2 mm, and the width of the second bonding pad is 0.5 mm-1.5 mm.
In the implementation process, the first bonding pad and the second bonding pad meet corresponding covering requirements on the premise of ensuring the relative minimum size and the relative minimum slurry consumption, particularly the covering requirements under the condition of allowable deviation, and meanwhile, the tensile force requirement of the battery is ensured.
In a possible implementation manner, the middle part of each section of main gate printing line is further provided with an inter-fracture, after the grid line screen and the welding spot screen are configured to be accurately aligned, each inter-fracture corresponds to one first bonding pad, and the first bonding pad covers the corresponding inter-fracture.
In the implementation process, the middle part of the main grid printing line is provided with the inter-fracture, the slurry consumption of the printing grid line can be reduced, and the welding point formed by printing the first welding pad covers the inter-fracture on the main grid formed by printing, so that the complete main grid can be ensured to be connected.
In a possible implementation mode, the main grid printing line corresponding to the discontinuous opening extends 0.05mm to 0.15mm into the first bonding pad.
In the implementation process, through the extension design of the main grid printing line, the grid line screen printing plate and the welding spot screen printing plate are not accurately aligned in a chromatography manner, and after deviation within an allowable range occurs, welding spots formed by printing of the first bonding pad can still cover inter-fracture on the main grid formed by printing of the main grid printing line, so that the complete main grid can be connected.
In a possible implementation manner, the two sides of the first bonding pad corresponding to the discontinuous port along the main grid printing line direction are respectively provided with an extension disc, the length of the extension disc along the main grid printing line direction is 0.05 mm-0.15 mm, and the width along the fine grid printing line is larger than the line width of the main grid printing line.
In the implementation process, the grid line screen printing plate and the welding spot screen printing plate are not accurately aligned in overprinting, and after deviation within an allowable range occurs, welding spots formed by printing of the first welding disc and the extension disc can still cover fracture between corresponding main grids, so that the complete main grids are ensured to be connected.
In a second aspect, an embodiment of the present application provides a solar cell, which includes a main grid, a fine grid and a first soldering point, wherein the main grid, the fine grid and the first soldering point are formed by performing alignment printing on the supporting printing screen provided in the first aspect, the main grid and the fine grid respectively correspond to a main grid printing line and a fine grid printing line of the grid line screen, and the first soldering point corresponds to a first pad of the soldering point screen.
In the implementation process, a first welding point can be formed by adopting welding spot screen printing, then a main grid and a fine grid are formed by adopting grid line screen alignment printing, the first welding point covers the intersection point of the main grid and the fine grid to ensure effective lap joint between the main grid and the fine grid, the fine grid collects current and collects the current to the main grid, and then the current is output through the main grid in a whole piece; and the original gradual change design is saved, and the consumption of the sizing agent during printing is reduced.
In one possible implementation mode, the main grid and the fine grid are made of fire-through slurry; the first welding point is made of non-burn-through slurry.
In the implementation process, the main grid and the fine grid are printed by matching with the burn-through type slurry, and compared with the original design (the fine grid line is matched with the burn-through type silver paste, and the main grid is matched with the non-burn-through type silver paste), the printing area of the burn-through type slurry is increased, the ohmic contact area of the battery is increased, the contact resistance is reduced, and the FF of the battery is improved; the welding point is printed by matching with the non-burn-through type slurry, compared with the original design, the area of the welding point is unchanged, and the same tension effect is kept.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a diagram of an original master gate layout in the background art;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a diagram of an original fine grid layout in the background art;
FIG. 4 is a schematic diagram of a prior art final product after an offset of overprint;
fig. 5 is a schematic view of a grid line screen printing plate according to a first embodiment of the present application;
fig. 6 is a schematic view of a welding spot screen printing plate according to a first embodiment of the present application;
fig. 7 is a schematic view of the grid line screen and the welding spot screen aligned according to the first embodiment of the present application;
FIG. 8 is an enlarged view of portion B of FIG. 7;
fig. 9 is a schematic view of the grid line screen and the welding spot screen aligned according to the second embodiment of the present application;
FIG. 10 is a graph of the front side main grid pull test results using the original design and the new design;
FIG. 11 is a graph of the front silver paste consumption results corresponding to the original design and the new design.
Icon: 10-original master grid layout; 11-main gate printed line; 12-a graded printing line; 13-a soldering pad; 20-original fine grid layout; 21-fine grid printing line; 30-thin grid lines; 40-a main gate line; 50-notch; 60-a gradient; 70-welding points; 100-a grid line screen printing plate; 110-main gate printing line; 111-harpoon line; 112-a break port; 120-fine grid printing lines; 130-a cross-over point; 200-welding spot screen printing plate; 210-a first pad; 220-a second pad; 230-extension disk.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
First embodiment
Referring to fig. 5 to 7, the supporting screen printing plate provided in this embodiment is used for printing an electrode of a solar cell, and includes a supporting grid line screen printing plate 100 and a welding spot screen printing plate 200. The grid line screen 100 is used for printing a grid line, and has a complete grid line structure and comprises a plurality of main grid printing lines 110 and a plurality of fine grid printing lines 120 which are parallel to each other, the main grid printing lines 110 and the fine grid printing lines 120 are intersected and provided with a plurality of intersections 130, the main grid printing lines 110 are correspondingly printed to form a main grid, the fine grid printing lines 120 are correspondingly printed to form a fine grid, each main grid printing line 110 is of a sectional type structure, two ends of each section of the main grid printing line 110 are respectively provided with a harpoon line 111 with an outward opening at intervals, and the harpoon lines 111 are correspondingly printed to form a harpoon opening and are used for outputting current collected on the main grid; the welding spot screen 200 is used for printing welding spots, and has a plurality of first welding pads 210 and second welding pads 220 which are dispersedly arranged, and the first welding pads 210 and the second welding pads 220 are respectively printed correspondingly to form welding spots. After the grid line screen 100 and the spot welding screen 200 are configured to be precisely aligned, each first pad 210 can cover the main grid printing line 110 in the grid line screen 100, and each second pad 220 can cover a gap region between one fishline 111 and the adjacent main grid printing line 110.
In other embodiments, the grid line screen 100 can be used to print the grid line structure, and the solder joints can be printed in other manners, such as single dot printing. Each first pad 210 can cover one intersection 130 to further ensure an effective overlap between the main grid and the fine grid while achieving a soldering effect.
It should be noted that "precise alignment" in the embodiment of the present application refers to complete alignment without any offset; "alignment" refers to actual alignment, and may be offset, usually vertically; the term "cover" refers to that the projection of the covered object on the screen where the covered object is located in the area (including the boundary) of the covered object, for example, after the gate line screen 100 and the spot screen 200 are precisely aligned, each first pad 210 can cover the main gate printing line 110 in the gate line screen 100, that is, the projection of the main gate printing line 110 on the spot screen 200 is located in the first pad 210, and can be located just at the edge of the first pad 210.
In the embodiment of the present application, the main gate printed line 110 is vertically disposed, and the fine gate printed line 120 is horizontally disposed, that is, the main gate printed line 110 and the fine gate printed line 120 are perpendicular to each other. The width (line width) of each main gate printing line 110 is 0.05 mm-0.15 mm, and the distance between two adjacent main gate printing lines 110 is 15 mm-25 mm; the length of the harpoon line 111 is 5 mm-8 mm, the inner side distance of the harpoon line 111 is 1 mm-1.5 mm, and the line width of the harpoon line 111 is 0.05 mm-0.15 mm. The line width of the fine grid printing lines 120 is 0.015 mm-0.05 mm, and the distance between adjacent fine grid printing lines 120 is 0.05 mm-2 mm. Illustratively, the width of each main gate printed line 110 is 0.05mm, and the distance between two adjacent main gate printed lines 110 is 15 mm; the length of the fish-fork line 111 is 5mm, the inner side distance of the fish-fork line 111 is 1mm, and the line width of the fish-fork line 111 is 0.05 mm. The line width of the fine gate printed lines 120 is 0.015mm, and the space between adjacent fine gate printed lines 120 is 0.5 mm.
In this embodiment, the first pad 210 and the second pad 220 are different, that is, the covered objects are different, and in general, the area of the second pad 220 is larger than the area of the first pad 210, and the area covered by the second pad 220 is also larger than the area covered by the first pad 210, so as to meet the corresponding covering requirement. The first pad 210 is generally rectangular, and may have a length in the fine gate direction of 0.5mm to 1.5mm and a width in the main gate direction of 0.5mm to 1 mm; the second pad 220 is generally rectangular, and has a length in the fine gate direction of 0.5mm to 2mm and a width in the main gate direction of 0.5mm to 1.5 mm. As an embodiment, the first pad 210 has a rectangular shape, a length of 1mm and a width of 0.5 mm; the second pad 220 has a rectangular shape with a length of 1mm and a width of 1 mm.
Referring to fig. 8, each main gate printing line 110 further has a break 112 in the middle, and after the gate line screen 100 and the solder mask 200 are configured to be aligned precisely, each break 112 corresponds to one first pad 210, and the first pad 210 can cover the corresponding break 112.
In order to ensure that the first bonding pad 210 still functions after allowable offset (usually offset along the vertical direction) occurs during overprinting of the grid line screen 100 and the solder joint screen 200, the main grid printing line 110 corresponding to the intermittent fracture 112 extends 0.05mm to 0.15mm into the first bonding pad 210, which is specifically extended by 0.05mm in this embodiment.
In order to ensure that the second pad 220 still functions after the allowable offset occurs during the overprinting of the gate line screen 100 and the solder joint screen 200, i.e. the fishline 111 and the main gate printing line 110 are connected, it is required to ensure that after the gate line screen 100 and the solder joint screen 200 are configured to be accurately aligned, the main gate printing line 110 and the fishline 111 covered by the second pad 220 extend 0.05mm to 0.15mm into the second pad 220 (the extension means that the side edge of the first pad 210 extends a distance inward), and in an exemplary embodiment, the extension is specifically 0.05 mm.
According to the matched printing screen printing plate, a main grid and a fine grid are designed on a layout, and through one screen printing plate, the through-burning type slurry is matched for printing; the method is suitable for Topcon/HIT front and back layouts and PERC front layouts by reserving welding points on a main grid layout in an original layout and matching non-burn-through type slurry printing.
Second embodiment
Referring to fig. 5 to 7 and 9, a specific structure of a supporting printing screen according to the present embodiment is substantially the same as that of the first embodiment, except that: in this embodiment, the two sides of the first pad 210 corresponding to the discontinuous opening 112 along the main gate printing line 110 are respectively provided with an extension disc 230, so as to ensure that the first pad 210 and the extension disc 230 can still function after allowing offset occurs during overprinting of the gate line screen 100 and the solder joint screen 200; the second pad 220 is provided with corresponding extension plates 230 respectively at a side adjacent to the main gate printing line 110 and a side adjacent to the fishline 111 along the main gate printing line 110, so as to ensure that the second pad 220 and the extension plates 230 still function, i.e. connect the fishline 111 and the main gate printing line 110, after allowable offset occurs during overprinting of the gate line screen 100 and the solder dot screen 200. In general, the length of the extension plate 230 along the main gate printed line 110 is 0.05mm to 0.15mm, and the width is greater than the line width of the main gate printed line 110, and the length of the extension plate 230 in this embodiment is 0.05mm and the width is 0.08 mm.
During printing, the first pad 210 and the extension plate 230 are made of non-fire through paste, specifically non-fire through silver paste, and a first welding point formed correspondingly thereto has an extension line corresponding to the extension plate 230.
Third embodiment
Referring to fig. 5 to 7, the present embodiment further provides a solar cell, which includes a main grid, a fine grid, a first welding point, and a second welding point, which are formed by the above-mentioned matching screen printing plate through alignment printing. The first welding point is printed correspondingly by the first welding pad 210 of the welding spot screen 200 matching with the non-burn-through silver paste, the second welding point is printed correspondingly by the second welding pad 220 of the welding spot screen 200 matching with the non-burn-through silver paste, the main grid is printed by the main grid printing line 110 matching with the burn-through paste, specifically the burn-through silver paste, and the fine grid is printed by the fine grid printing line 120 matching with the burn-through paste, specifically the burn-through silver paste. Correspondingly, the main grid and the fine grid are made of fire-through silver paste; the first welding point and the second welding point are made of non-burn-through silver paste. The main grid and the fine grid respectively correspond to the main grid printing line 110 and the fine grid printing line 120 of the grid line screen 100, and the first welding point and the second welding point respectively correspond to the first bonding pad 210 and the second bonding pad 220 of the welding point screen 200, so that the arrangement, relative positions and the like of the main grid, the fine grid, the first welding point and the second welding point are completely the same as those of the main grid printing line 110, the fine grid printing line 120, the first bonding pad 210 and the second bonding pad 220 aligned with the matching printing screen.
The solar cell electrodes obtained by printing the matched printing screen (new design) and the original layout (original design) of the background art are compared and analyzed, the lengths, line widths, number and arrangement modes of the main grid printing lines and the fine grid printing lines of the new design and the original design are basically the same, the shapes, number and arrangement modes of the bonding pads are also basically the same, and the welding requirements are met. The results are as follows:
firstly, tension force: referring to fig. 10, in the embodiment, the average tension of the solar cell electrode obtained by using the newly designed matched printing screen printing is 5.5N, which is not significantly different from the tension of the solar cell electrode obtained by using the originally designed original layout printing, and meets the battery reliability control standard (the tension standard is greater than 0.63N).
Secondly, the battery performance: the cell Ncell obtained by the matched screen printing of the new design is 0.11% higher than the solar cell obtained by the original design printing, and mainly has an FF 0.29% higher than that of the solar cell obtained by the original design printing, and the specific results are shown in table 1:
TABLE 1 comparison of cell Performance
| Group of | Voc | Isc | Rs | Rsh | FF | Ncell |
| Original design | 0.7057 | 10.2884 | 0.0015 | 2132 | 82.54 | 23.78％ |
| New design | 0.7054 | 10.3063 | 0.0014 | 4306 | 82.83 | 23.90％ |
| New design-original design | -0.0003 | 0.0178 | -0.0001 | 2174 | 0.29 | 0.11％ |
Thirdly, silver paste unit consumption: referring to fig. 11, the wet weight of the silver paste of the solar cell obtained by adopting the newly designed matched printing screen printing is reduced by 2 mg/sheet compared with that of the solar cell obtained by adopting the original design printing.
To sum up, according to the matched printing screen and solar cell provided by the embodiment of the application, the main grid and the fine grid are arranged on the same screen, so that the effective lap joint between the main grid and the fine grid is ensured, the original gradual change design is omitted, and the consumption of the slurry during printing is reduced.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The matched printing screen is characterized by comprising a welding spot screen and a grid line screen which are matched, wherein the grid line screen comprises a plurality of main grid printing lines and a plurality of fine grid printing lines which are parallel to each other, the main grid printing lines and the fine grid printing lines are intersected and provided with a plurality of intersections, the welding spot screen is provided with a plurality of first bonding pads which are dispersedly arranged, and after the grid line screen and the welding spot screen are aligned, each first bonding pad can cover the main grid printing lines in the grid line screen.
2. The matched printing screen plate as claimed in claim 1, wherein each main grid printing line is a segmented structure, two ends of each segment of the main grid printing line are respectively provided with a fishline with an outward opening at an interval, the welding spot screen plate further comprises a plurality of second pads which are dispersedly arranged, and after the grid line screen plate and the welding spot screen plate are configured to be accurately aligned, each second pad can cover an interval area between one fishline and the adjacent main grid printing line.
3. The matched printing screen of claim 2, wherein the grid line screen and the solder joint screen are configured such that after precise alignment, the main grid printed line covered by the second pad extends 0.05mm to 0.15mm into the second pad.
4. The matched printing screen of claim 2, wherein the first pad is rectangular, has a length of 0.5mm to 1.5mm and a width of 0.5mm to 1 mm; the second bonding pad is rectangular, the length of the second bonding pad is 0.5 mm-2 mm, and the width of the second bonding pad is 0.5 mm-1.5 mm.
5. The matched printing screen of claim 1, wherein each segment of the main grid printing line further has a break in the middle, and after the grid line screen and the solder dot screen are aligned precisely, each break corresponds to one of the first pads, and the first pad covers the corresponding break.
6. The matched printing screen of claim 5, wherein the main grid printing line corresponding to the gap is extended to 0.05mm to 0.15mm into the first pad.
7. The matched printing screen of claim 5, wherein the first bonding pad corresponding to the break is provided with extension discs at two sides along the main grid printing line direction, the length of the extension disc along the main grid printing line direction is 0.05 mm-0.15 mm, and the width along the fine grid printing line is greater than the line width of the main grid printing line.
8. A solar cell, comprising a main grid, a fine grid and a first welding point, wherein the main grid, the fine grid and the first welding point are printed by using the matching printing screen plate of any one of claims 1 to 7 in a contraposition mode, the main grid and the fine grid respectively correspond to the main grid printing line and the fine grid printing line of the grid line screen plate, and the first welding point corresponds to the first welding pad of the welding point screen plate.
9. The solar cell of claim 8, wherein the main grid and the fine grid are made of fire-through paste; the first welding point is made of non-burn-through slurry.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116061548A (en) * | 2022-11-29 | 2023-05-05 | 徐州智兴电子科技有限公司 | Composite screen printing plate |
| WO2024169995A1 (en) * | 2023-02-17 | 2024-08-22 | 昇印光电（昆山）股份有限公司 | Fine grid screen plate and printing screen plate assembly |
| WO2024169993A1 (en) * | 2023-02-17 | 2024-08-22 | 昇印光电（昆山）股份有限公司 | Fine grid screen, main grid screen, and printing screen assembly |
-
2021
- 2021-03-16 CN CN202120544465.9U patent/CN214821750U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116061548A (en) * | 2022-11-29 | 2023-05-05 | 徐州智兴电子科技有限公司 | Composite screen printing plate |
| WO2024169995A1 (en) * | 2023-02-17 | 2024-08-22 | 昇印光电（昆山）股份有限公司 | Fine grid screen plate and printing screen plate assembly |
| WO2024169993A1 (en) * | 2023-02-17 | 2024-08-22 | 昇印光电（昆山）股份有限公司 | Fine grid screen, main grid screen, and printing screen assembly |
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