CN216362130U - Front pattern structure of solar cell and solar cell - Google Patents
Front pattern structure of solar cell and solar cell Download PDFInfo
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- CN216362130U CN216362130U CN202120965815.9U CN202120965815U CN216362130U CN 216362130 U CN216362130 U CN 216362130U CN 202120965815 U CN202120965815 U CN 202120965815U CN 216362130 U CN216362130 U CN 216362130U
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Abstract
The utility model discloses a front graphic structure of a solar cell, which comprises a first printed graphic and a second printed graphic, wherein the first printed graphic comprises a plurality of pad groups which are arranged in parallel, each pad group comprises pad points and pad connecting lines arranged between the adjacent pad points in the pad group, the pad points in each pad group comprise end pad points positioned at the end part and internal pad points positioned inside, and the size of the end pad points is larger than that of the internal pad points; the second printed graph comprises a hollow part arranged corresponding to the end part of each pad group and a plurality of secondary grid lines arranged perpendicular to the pad groups; overprint holes are formed in the first printed graph, overprint points are arranged on the second printed graph, the overprint points are used for being contained in the overprint holes, and the overprint holes are formed in the end portion welding disc points.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic modules, and particularly relates to a front side graph structure of a solar cell piece printed in a grading mode and the solar cell piece comprising the front side graph structure.
Background
At present, photovoltaic development is rapid, and the corners of various high-efficiency battery pieces are exposed. At present, in the preparation process of a solar cell, in order to improve the welding tension of a main grid, reduce the consumption of slurry of a fine grid, reduce the shading area, improve the efficiency and reduce the cost, a front pattern is subjected to a printing design in multiple times.
However, the current printed front graphic design has the following disadvantages: 1. the size of each bonding pad is consistent, the pattern design is limited, and poor welding is easy to occur; 2. the width of the thin grid is not changed, so that poor connection between the thin grid and other grid lines is easily caused; 3. the utility model discloses a method for manufacturing a solar cell panel printing screen, which is characterized in that overprint points are additionally arranged or arranged at the position of a middle bonding pad, for example, Chinese invention patent application No. 2020109043718 entitled "a solar cell panel printing screen and a printing process thereof" discloses that positioning points are arranged on a main grid, and reference points matched with the positioning points are arranged on a fine grid. Therefore, a front pattern structure design capable of simultaneously solving the above problems is needed.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art and achieve the above object, the present invention provides an improved front pattern structure of a solar cell, which can improve the printing effect and the printing quality; improve the contact between the grid line, improve current transmission raise the efficiency.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a front pattern structure of a solar cell piece is designed on the front side of the solar cell piece and comprises a first printed pattern and a second printed pattern, wherein the first printed pattern comprises a plurality of parallel pad groups, each pad group comprises a plurality of pad points arranged at intervals and a pad connecting line arranged between every two adjacent pad points in the pad group, each pad point in each pad group comprises an end pad point positioned at the end and an inner pad point positioned between the end pad points, and the size of the end pad point is larger than that of the inner pad point; the second printed graph comprises a hollow part arranged corresponding to the end part pad point and a plurality of auxiliary grid lines arranged perpendicular to the pad group; the first printed pattern is provided with an overprint hole, the second printed pattern is provided with an overprint point, the overprint point is contained in the overprint hole so that the first printed pattern is matched with the second printed pattern, and the overprint hole is formed in the end part welding disc point.
The positive pattern structure is designed into a first time printing pattern and a second time printing pattern which are printed in a grading mode, the hollowed-out overprinting holes are designed in the first time printing pattern, the solid overprinting points matched with the overprinting holes are designed in the second time printing pattern, overprinting alignment is carried out, the hollowed-out overprinting holes are complemented, overprinting accuracy is more conveniently detected, the overprinting holes are arranged in the pad points, and no extra printing pattern is arranged outside the main grid area.
The size of the end welding point is larger than that of the inner welding point, and the hollowed overprinting hole is formed in the end welding point with the larger size, so that diversified and large-size overprinting holes can be designed, and the graphic design and the printing quality integrity are facilitated; the method is more favorable for detecting the overprinting accuracy of the camera, improves the printing overprinting quality and improves the product percent of pass.
The hollow part is arranged in a hollow mode, too much slurry is not filled in the hollow part, the height difference after printing is reduced, the welding quality is improved, the identification fault rate of component welding camera detection is improved, and the component yield and the qualified rate are improved. In some embodiments, the hollowed-out portion may be provided in a hollowed-out shape such as a U shape, a V shape, a rectangular shape, or a trapezoid shape.
According to some preferred embodiments of the present invention, the connecting portion for connecting to the pad group is disposed on the sub-gate line, the connecting portion includes a side portion, the side portion is trapezoidal, the height of the trapezoidal side portion is parallel to the sub-gate line, that is, the side portion is disposed along the extending direction of the sub-gate line, the width of the trapezoidal side portion gradually decreases from the position close to the pad group to the direction of the sub-gate line, and the connecting portion including the trapezoidal side portion is added to improve the contact between the pad group and the sub-gate line, improve the current transmission, and thus improve the efficiency of the solar cell.
According to some preferred embodiment aspects of the present invention, the connection portion further includes a middle portion between the two side portions, the middle portion being adapted to be connected to the pad connection line, and the side portions being adapted to connect the side edges of the pad connection line to the finger lines. The height of the middle part is the same as the maximum width of the side part of the trapezoid; the width of the middle part is larger than or equal to that of the corresponding pad connecting line. The width of the bonding pad connecting wire is slightly smaller than the size of a bonding pad point, the middle part between the two side parts is connected with the bonding pad connecting wire in an overlapping mode, contact between graphs is improved, current collection and transmission are improved, and therefore efficiency of the solar cell is improved.
According to some preferred embodiments of the present invention, the pad link lines in each of the pad groups have widths gradually increasing from the pad link line in the middle to the pad link lines on both sides. The connection and the contact between the pad point and the connecting line are improved, the welding performance of the assembly is improved, the tensile force in the welding strip direction is improved, the welding quality of the assembly is improved, the problems of assembly insufficient welding and the like are solved, the assembly product is improved, the abnormality of repair and the like in the assembly manufacturing process is reduced, and the assembly productivity is greatly improved. For example, in some embodiments, each pad group includes 7 pad points and 6 pad connecting lines between adjacent pad points, the width of the two pad connecting lines at the middle position is the thinnest, and the width of the two pad connecting lines at the outermost position is the thickest.
According to some preferred embodiments of the present invention, the end pad point includes a rectangular portion and extending portions located at four corners of the rectangular portion, the extending portions have the same extending direction as the sub-gate lines, the extending portions are used for being connected to connection portions on the sub-gate lines, and an upper portion or a lower portion of the rectangular portion is connected to a bottom portion or a top portion of the hollowed portion. The end bonding pad point is designed to be similar to an I shape, so that the contact with the lower end of the hollow part and the contact with the secondary grid line are facilitated, the metal contact of the graph after the graph is printed in a grading mode is effectively improved, the current transmission is improved, and the efficiency is improved. And the I-shaped welding pads are used for reducing the welding deviation of the assembly, improving the welding quality and improving the product yield of the assembly.
According to some preferred embodiments of the present invention, the hollow portion includes a first branch portion and a second branch portion, the extending directions of the first branch portion and the second branch portion intersect with the sub-gate line, the connection portion is disposed at a connection position of the sub-gate line and the first branch portion or the second branch portion, and a width of the connection portion gradually decreases from a position close to the hollow portion to a direction of the sub-gate line. And a grid line structure is not arranged between the first branch part and the second branch part in the same hollow part.
Namely, the hollow-out part is similar to a V-shaped shape, and the first branch part and the second branch part are two sides of the V-shaped. Through setting up fretwork portion to the shape that is similar to the V type, can increase the shape difference between fretwork portion and the solder strip, avoid the camera misjudgement, for traditional linear type's main bars or set up fretwork portion to rectangle or trapezoidal, can more effectual improvement camera discernment, improve subassembly welding skew, rosin joint scheduling problem.
According to some preferred aspects of the utility model, the overprint point is disposed below a gap between the first and second branches. The size of the end welding pad points is larger than that of the inner welding pad points, so that the graphic design is facilitated, the printing effect is improved, and the printing quality is improved; and the overprinting point is arranged on the welding pad point at the end part of the main grid, so that the overprinting point is different from other abnormal slurry leakage points, and the overprinting accuracy of the camera can be better detected.
According to some preferred embodiments of the present invention, the second printed pattern includes a border line located at a periphery of the sub-gate line, the border line is used to connect the sub-gate line, the connection portion is disposed at a connection position of the sub-gate line and the border line, and a width of the connection portion gradually decreases from a position close to the border line to a direction of the sub-gate line. The frame line is connected with the secondary grid line, so that the current collection of the edge grid line is effectively improved, the current transmission path is increased by the frame line, and the battery EL (electroluminescence) is improved. On the printing of a large-size silicon chip, the printing effect of the edge grid line can be improved, and the edge grid line and the frame line can be better connected.
According to some preferred embodiments of the present invention, the second printed pattern includes a breakage preventing thin gate line between the sub-gate lines, the breakage preventing thin gate line being disposed perpendicular to the sub-gate lines. The anti-breaking grid increases a current transmission loop and improves the battery EL.
By adding the frame line and the continuous or discontinuous anti-breaking thin grid line, the current transmission path is increased, and the current collection and transmission are improved, so that the efficiency of the solar cell is improved.
The utility model also provides a solar cell piece comprising the front side graph structure.
Compared with the prior art, the utility model has the advantages that: according to the front pattern structure of the solar cell, the size of the end welding pad points is larger than that of the inner welding pad points, so that pattern design is facilitated, the printing effect is improved, and the printing quality is improved; the overprinting point is arranged on the welding pad point at the end part of the main grid, is different from other abnormal slurry leakage points, is more favorable for the camera to detect the overprinting accuracy, and improves the product percent of pass.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a first printed pattern in a front pattern structure of a solar cell according to an embodiment of the present invention;
FIG. 2 is an enlarged view of section I of FIG. 1;
FIG. 3 is a schematic diagram of a second printed pattern in the front pattern structure of a solar cell according to an embodiment of the present invention;
FIG. 4 is an enlarged view of section II of FIG. 3;
FIG. 5 is an enlarged view of section III of FIG. 3;
FIG. 6 is an enlarged view of portion A of FIG. 5;
wherein the reference numerals include: 1-pad group, 2-secondary grid line, 3-frame line, 4-breakage-proof thin grid line, 51-internal pad point, 52-end pad point, 521-rectangular part, 522-extension part, 6-pad connecting line, 7-hollow part, 71-first branch part, 72-second branch part, 81-overprint hole, 82-overprint point, 9-connecting part, 91-side part, 92-middle part and 10-silicon chip.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. 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 invention.
In the solar cell in this embodiment, the front pattern structure on the silicon wafer 10 is formed by printing in several times, and includes a first printed pattern as shown in fig. 1-2 and a second printed pattern as shown in fig. 3-6.
Specifically, as shown in fig. 1-2, the first printed pattern includes a plurality of pad groups 1 arranged in parallel and arranged parallel to the side of the silicon wafer 10. Each group of the pad group 1 comprises pad points and pad connecting lines 6 arranged between adjacent pad points in the pad group 1, the pad points in each group of the pad group 1 comprise end pad points 52 positioned at the end part and inner pad points 51 positioned inside, and the size of the end pad points 52 is larger than that of the inner pad points 51.
As shown in fig. 1, each pad group 1 in this embodiment includes 7 pad points and 6 pad connection lines 6 located between adjacent pad points, and each pad connection line 6 has a uniform width. In other embodiments, the width of the pad connecting line 6 in each pad group 1 gradually increases from the middle pad connecting line 6 to the pad connecting lines 6 on both sides. That is, the two pad connection lines 6 at the middle positions of the 6 pad connection lines 6 have the smallest width, and the two pad connection lines 6 at the outermost positions have the largest width. The width of the pad connecting wire 6 is different, so that the connection and the contact between the pad points and the connecting wire can be improved, the welding property of the assembly is improved, the pulling force in the welding strip direction is improved, the welding quality of the assembly is improved, the problems of assembly false welding and the like are reduced, the assembly product is improved, the abnormality of repair and the like in the assembly manufacturing process is reduced, and the assembly productivity is greatly improved.
The second-time printed graph comprises a hollow part 7 arranged corresponding to the end part pad point 52, a plurality of auxiliary grid lines 2 arranged perpendicular to the pad group 1, a frame line 3 positioned on the periphery of the auxiliary grid lines 2 and an anti-breaking thin grid line 4 positioned between the auxiliary grid lines 2; the frame line 3 is used for connecting the auxiliary grid line 2, and the breakage-proof thin grid line 4 is arranged perpendicular to the auxiliary grid line 2. By adding the frame line 3 and the continuous or discontinuous breakage-proof thin grid line 4, a current transmission path is increased, and current collection and transmission are improved, so that the efficiency of the solar cell is improved.
The hollow part 7 is arranged in a hollow mode, too much slurry is not filled in the hollow part, the height difference after printing is reduced, the welding quality is improved, the identification failure rate of component welding camera detection is improved, and the component yield and the qualified rate are improved. The hollow portion 7 in this embodiment includes a first branch portion 71 and a second branch portion 72, the extending directions of the first branch portion 71 and the second branch portion 72 intersect, and the extending directions of the first branch portion 71 and the second branch portion 72 intersect with the sub-gate line 2. No gate line structure is provided between the first branch portion 71 and the second branch portion 72 in the same hollow portion 7. That is, the hollow-out portion 7 is shaped like a V, and the first branch portion 71 and the second branch portion 72 are two sides of the V. Through setting up fretwork portion 7 to the shape that is similar to the V type, can increase the shape difference between fretwork portion 7 and the solder strip, avoid the camera misjudgement, for traditional linear type's main bars or set up fretwork portion 7 to rectangle or trapezoidal, can more effectual improvement camera discernment, improve subassembly welding skew, rosin joint scheduling problem.
Overprint holes 81 are formed in the first printed pattern, overprint points 82 are formed in the second printed pattern, the overprint points 82 are used for being accommodated in the overprint holes 81 so that the first printed pattern and the second printed pattern are matched, the overprint holes 81 are formed in the end portion welding disc points 52 in the embodiment, and the overprint points 82 are formed below a gap between the first branch portion 71 and the second branch portion 72. The size of the end part pad point 52 is larger than that of the inner pad point 51, and the hollowed overprint holes 81 are formed in the end part pad point 52 with the larger size, so that diversified and large-size overprint holes 81 can be designed, and the graphic design and the printing quality integrity are facilitated; the method is more favorable for detecting the overprinting accuracy of the camera, improves the printing overprinting quality and improves the product percent of pass.
As shown in fig. 4 to 6, in order to effectively ensure the connection between the sub-gate line 2 and the pad group 1 (pad point, pad connection line 6), the hollow portion 7 (first branch portion 71 or second branch portion 72), and the frame line 3, and improve the current transmission, thereby improving the efficiency of the solar cell, in this embodiment, the connection portion 9 is disposed at the connection position between the sub-gate line 2 and the pad group 1 (pad point, pad connection line 6), the hollow portion 7 (first branch portion 71 or second branch portion 72), and the frame line 3. The connecting portion 9 includes a side portion 91, the side portion 91 is trapezoidal, the height of the trapezoidal side portion 91 is parallel to the sub-gate line 2, and the width of the trapezoidal side portion 91 is gradually reduced from the position close to the pad group 1 (pad point, pad connection line 6), the hollow portion 7 (first branch portion 71 or second branch portion 72), or the frame line 3 toward the sub-gate line 2. Especially, on the printing of the large-size silicon chip 10, the printing effect of the edge grid lines can be improved, and the better connection between the edge grid lines and the frame lines 3 can be ensured.
The connection portion 9 further includes a middle portion 92 located between the two side portions 91 at a position connected to the pad connection line 6, the middle portion 92 being for connection to the pad connection line 6, and the side portions 91 being for connection of the side edges of the pad connection line 6 to the finger lines 2. The height of the middle portion 92 is the same as the maximum width of the trapezoidal side portions 91; the width of the intermediate portion 92 is greater than or equal to the width of the corresponding pad connection line 6. The width of the pad connecting line 6 is slightly smaller than the size of a pad point, and the middle part 92 between the two side parts 91 is connected with the pad connecting line 6 in an overlapping mode, so that the contact between patterns is improved, the current collection and transmission are improved, and the efficiency of the solar cell is improved.
As shown in fig. 2, the end pad point 52 in this embodiment includes a rectangular portion 521 and extending portions 522 located at four corners of the rectangular portion 521, the extending portions 522 have the same extending direction as the minor grid line 2, the extending portions 522 are used for being connected to the connecting portions 9 on the minor grid line 2, and the upper portion or the lower portion of the rectangular portion 521 is connected to the bottom portion or the top portion of the hollowed portion 7. That is, the end pad points 52 are designed to be similar to an i shape, which is more beneficial to contact with the lower end of the hollow part 7 and the secondary grid line 2, and effectively improves the metal contact of the graph after the graph is printed for several times, thereby improving the current transmission and the efficiency. And the I-shaped welding pads are used for reducing the welding deviation of the assembly, improving the welding quality and improving the product yield of the assembly.
In the embodiment, the front pattern structure is designed into a first-time printing pattern and a second-time printing pattern which are printed in a grading mode, the hollowed-out overprinting holes 81 are designed in the first-time printing pattern, the solid overprinting points 82 matched with the overprinting holes 81 are designed in the second-time printing pattern, overprinting alignment is carried out, and the hollowed-out overprinting holes 81 are complemented, so that the overprinting accuracy is more conveniently detected, the overprinting holes 81 are arranged in the welding pad points, and no extra printing pattern is outside the main grid area. The printing area and the using amount of the sizing agent are reduced on the cost; the printed points or the printed patterns in the patterns are prevented from being confused with the printed leakage points in the patterns in appearance, the appearance is influenced, and the detection intensity of the camera is effectively improved.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the utility model, and not to limit the scope of the utility model, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. The utility model provides a positive graphic structure of solar wafer, positive graphic structure designs in the front of solar wafer, its characterized in that: the front pattern structure comprises a first printed pattern and a second printed pattern, the first printed pattern comprises a plurality of pad groups which are arranged in parallel, each pad group comprises pad points which are arranged at intervals and pad connecting lines which are arranged between the adjacent pad points in the pad group, the pad points in each pad group comprise end pad points positioned at the end part and internal pad points positioned between the end pad points, and the size of each end pad point is larger than that of the internal pad points; the second printed graph comprises a hollow part arranged corresponding to the end part pad point and a plurality of auxiliary grid lines arranged perpendicular to the pad group; the first printed pattern is provided with an overprint hole, the second printed pattern is provided with an overprint point, the overprint point is contained in the overprint hole so that the first printed pattern is matched with the second printed pattern, and the overprint hole is formed in the end part welding disc point.
2. The front graphic structure of claim 1, wherein: the connecting part is arranged on the auxiliary grid line and used for being connected with the pad group, the connecting part comprises a trapezoidal side part, the side part is arranged along the extending direction of the auxiliary grid line, and the width of the trapezoidal side part is gradually reduced from the position close to the pad group to the direction of the auxiliary grid line.
3. The front graphic structure of claim 2, wherein: the connecting part further comprises a middle part positioned between the two side parts, the middle part is used for being connected with the pad connecting wire, and the side parts are connected between the side edge of the pad connecting wire and the secondary grid line.
4. The front graphic structure of claim 1, wherein: the width of the bonding pad connecting line in each group of bonding pad groups is gradually increased from the bonding pad connecting line in the middle to the bonding pad connecting lines on two sides.
5. The front graphic structure of claim 2, wherein: the end bonding pad point comprises a rectangular part and extending parts located at four corners of the rectangular part, the extending parts are the same as the extending direction of the secondary grid lines, the extending parts are used for being connected with the connecting parts on the secondary grid lines, and the rectangular part is connected with the hollow parts.
6. The front graphic structure of claim 5, wherein: the hollow portion comprises a first branch portion and a second branch portion, the extending directions of the first branch portion and the second branch portion are crossed with the auxiliary grid line, the connecting portion is arranged at the connecting position of the auxiliary grid line and the first branch portion or the second branch portion, and the width of the connecting portion is gradually reduced from the position close to the hollow portion to the direction of the auxiliary grid line.
7. The front graphic structure of claim 6, wherein: the overprint point is disposed below a gap between the first branch portion and the second branch portion.
8. The front graphic structure of claim 2, wherein: the second-time printed pattern comprises a frame line positioned on the periphery of the secondary grid line, the frame line is used for being connected with the secondary grid line, the connecting part is arranged at the connecting part of the secondary grid line and the frame line, and the width of the connecting part is gradually reduced from the position close to the frame line to the direction of the secondary grid line.
9. The front graphic structure of any one of claims 1 to 8, wherein: the second time of printing the pattern comprises breakage-proof thin grid lines located between the auxiliary grid lines, and the breakage-proof thin grid lines are perpendicular to the auxiliary grid lines.
10. A solar cell sheet comprising the front pattern structure of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120965815.9U CN216362130U (en) | 2021-05-07 | 2021-05-07 | Front pattern structure of solar cell and solar cell |
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| CN202120965815.9U CN216362130U (en) | 2021-05-07 | 2021-05-07 | Front pattern structure of solar cell and solar cell |
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| CN216362130U true CN216362130U (en) | 2022-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117253928A (en) * | 2023-11-13 | 2023-12-19 | 淮安捷泰新能源科技有限公司 | Solar cell piece, component and power consumption determining method based on anti-breaking grid structure |
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2021
- 2021-05-07 CN CN202120965815.9U patent/CN216362130U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117253928A (en) * | 2023-11-13 | 2023-12-19 | 淮安捷泰新能源科技有限公司 | Solar cell piece, component and power consumption determining method based on anti-breaking grid structure |
| CN117253928B (en) * | 2023-11-13 | 2024-03-15 | 淮安捷泰新能源科技有限公司 | Solar cell piece, component and power consumption determining method based on anti-breaking grid structure |
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