CN214753794U - Front side pattern structure of solar cell suitable for step-by-step printing and solar cell - Google Patents
Front side pattern structure of solar cell suitable for step-by-step printing and solar cell Download PDFInfo
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- CN214753794U CN214753794U CN202121420960.5U CN202121420960U CN214753794U CN 214753794 U CN214753794 U CN 214753794U CN 202121420960 U CN202121420960 U CN 202121420960U CN 214753794 U CN214753794 U CN 214753794U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The utility model discloses a positive graphic structure of solar wafer suitable for step-by-step printing, positive graphic structure design is in solar wafer's front, positive graphic structure includes the first time printing figure and the second time printing figure, the first time printing figure includes a plurality of parallel arrangement's main grid line, every the main grid line is including the tip welding plate point that is located main grid line tip, interval distribution at two between the tip welding plate point, connect the connecting wire between tip welding plate point and inside welding plate point or between two inside welding plate points and set up the first connecting grid on welding plate point and connecting wire, the extending direction of first connecting grid is perpendicular to the extending direction of connecting wire; the second printed graph comprises a hollow part and a plurality of auxiliary grid lines, wherein the hollow part is arranged corresponding to the end part welding spot; the first connecting grid is used for connecting the main grid line and the auxiliary grid line. The utility model also provides a solar wafer of positive figure structure as above.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic module, concretely relates to positive graphic structure of solar wafer of step-by-step printing and the solar wafer including this positive graphic structure.
Background
Solar photovoltaic power generation has become a world-wide industry with general attention and key development due to its characteristics of cleanness, safety, convenience, high efficiency and the like. With the continuous innovation of the technology, the conversion efficiency of the solar cell is increased day by day, so that cost reduction and efficiency improvement become important for the current solar enterprises.
The existing printing mode of the solar cell can be divided into single printing, step printing and secondary printing, and compared with the traditional single printing, the step printing has the excellent characteristics of reducing unit consumption cost, improving conversion rate, enhancing front electrode tension and the like, so that the solar cell adopting distributed printing can effectively achieve the purposes of cost reduction and efficiency improvement.
At present, the two ends of the main grid of the positive electrode of most solar cells adopt U-shaped hollow design, so that the hidden crack risk of welding at the assembly end is improved, and meanwhile, the consumption of silver paste at the cell end can be effectively reduced.
However, in the front pattern structure of the conventional solar cell, on one hand, since the printing part of the main grid uses the non-burn-through type front silver paste, particularly the U-shaped hollow part of the main grid, and is printed integrally with the main grid, the offset is easy to generate, and since the non-burn-through type front silver paste cannot form a good Ag-Si alloy layer with a silicon substrate, the contact resistance is increased, the current transmission capability is weakened, and the phenomenon of blackening under EL detection is caused; on the other hand, in the front pattern structure of the conventional solar cell, although the tapered connection grid is added at the connection position of the main grid and the auxiliary grid to improve the electrical connection between the main grid line and the auxiliary grid line and ensure the current transmission, under the condition that some printing precision is insufficient or the equipment is older, the main grid line and the auxiliary grid line may not be well electrically connected only by adding the tapered connection grid.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention provides an improved front pattern structure of a solar cell, which can improve the printing effect and the printing quality; the contact between grid lines is improved, the current transmission is improved, and the efficiency is improved; avoid the metal recombination that the thick liquids problem leads to, and reduce cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the front pattern structure of the solar cell suitable for step-by-step printing comprises a first printing pattern and a second printing pattern, wherein the first printing pattern comprises a plurality of main grid lines which are arranged in parallel, each main grid line comprises an end pad point positioned at the end of the main grid line, inner pad points which are distributed between the two end pad points at intervals, a connecting line connected between the end pad point and the inner pad point or between the two inner pad points, and a first connecting grid arranged on the pad points and the connecting line, and the extending direction of the first connecting grid is perpendicular to the extending direction of the connecting line; the second printed graph comprises a hollow part arranged corresponding to the end part welding pad point and a plurality of auxiliary grid lines arranged in parallel, and the auxiliary grid lines are arranged perpendicular to the connecting lines; the first connecting grid is used for connecting the main grid line and the auxiliary grid line; the hollow part comprises a first branch part and a second branch part, the top ends and the bottom ends of the first branch part and the second branch part are respectively separated, the extending directions of the first branch part and the second branch part are intersected, the extending directions of the first branch part and the second branch part are crossed with the secondary grid line, and the end part welding spot is used for connecting the bottom ends of the first branch part and the second branch part; the first time of pattern printing adopts non-burn-through type positive silver paste, and the second time of pattern printing adopts burn-through type positive silver paste.
And a grid line structure is not arranged between the first branch part and the second branch part in the same hollow part. 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 part. 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. 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.
Through setting up first connecting grid for the tip pad point designs into similar "worker" style of calligraphy, is favorable to more with the lower extreme contact of fretwork portion and with vice grid line contact, improves the metal contact of figure after through substep printing effectively, thereby improves current transmission, raises 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.
According to the method, end part pad points, internal pad points, connecting lines and a first connecting grid corresponding to a main grid line are set to be printed with patterns for the first time, and non-burn-through type front silver paste is adopted; setting the secondary grid lines and the hollow parts as a second-time printing graph, and adopting burn-through type front silver paste; the composition of metal is reduced, so that the metal resistance is effectively reduced, the current transmission between the auxiliary grid lines is improved, and the battery efficiency is improved; the first connecting grid is arranged on the pad point and the connecting line, so that contact after overprinting is improved, and the slurry used in the first printing is prone to improving welding tension; through the effective combination of twice printing, improve battery efficiency and welding pulling force.
According to some preferred implementation aspects of the present invention, the connecting portion is provided on the auxiliary gate line, the connecting portion includes a second connecting grid, the position of the second connecting grid at least corresponds to the first connecting grid, the second connecting grid is used for connecting the auxiliary gate line with the first connecting grid or the auxiliary gate line with the main gate line. Through increasing the second connecting grid, can further guarantee the contact between main grid line and the vice grid line, improve current transmission to improve solar wafer's efficiency.
According to some preferred implementation aspects of the utility model, first connecting gate and/or second connecting gate are the isosceles trapezoid setting, and the height of isosceles trapezoid connecting gate is on a parallel with vice grid line, the upper base of isosceles trapezoid connecting gate is close to vice grid line, the lower base of isosceles trapezoid connecting gate is close to main grid line, the length of going to the bottom is greater than the length of upper base, isosceles trapezoid connecting gate is close to the length on the base of vice grid line is greater than or equal to the width of vice grid line. Namely, the width of the trapezoidal connecting grid is gradually reduced from the direction close to the connecting line to the direction of the secondary grid line. At least the part of the first connecting grid close to the auxiliary grid line is contacted with the second connecting grid, and the area of the second connecting grid is preferably larger than or equal to that of the first connecting grid. At the connection of the first and second connection gates, the width of the corresponding second connection gate is greater than that of the first connection gate, i.e., the second connection gate covers a portion of the first connection gate.
According to some preferred embodiments of the present invention, the first connecting grid has a gap between one end thereof close to the secondary grid line and the secondary grid line; and a gap is reserved between one end of the second connecting grid, which is far away from the secondary grid line, and the connecting line or the welding pad point. The metal composition is reduced on the premise of further ensuring good contact between the main grid line and the auxiliary grid line, the metal resistance is effectively reduced, the current transmission is improved, and therefore the battery efficiency is improved.
According to some preferred implementation aspects of the present invention, the connecting portion further includes an intermediate portion located between the two second connecting gates, the intermediate portion is located between the bottoms of the two isosceles trapezoid second connecting gates, the intermediate portion corresponds to the connecting line, and the intermediate portion is used for being connected with the connecting line. The height of the middle part is the same as the maximum width of the second connecting grid in the trapezoid shape; the width of the middle part is larger than or equal to the width of the corresponding connecting line. The middle part between the two second connecting grids is connected with the connecting line in an overlapping mode, so that the contact between the patterns is improved, the current collection and transmission are improved, and the efficiency of the solar cell is improved.
According to some preferred embodiments of the present invention, each of the width of the connecting line in the main gate line is gradually increased from the middle connecting line to the connecting 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 tension in the welding strip direction is improved, the welding quality of the assembly is improved, the problems of insufficient welding and the like of the assembly are reduced, the product quality of the assembly is improved, the abnormality of repair and the like in the manufacturing process of the assembly is reduced, and the productivity of the assembly is greatly improved. As in some embodiments, each group of bus bars includes 7 pad points and 6 connecting lines between adjacent pad points, the width of the two connecting lines at the middle position is the thinnest, and the width of the two connecting lines at the outermost position is the thickest.
According to some preferred implementation aspects of the utility model, the size of tip pad point is greater than the size of inside pad point, overprint hole has been seted up on the first printing figure, overprint point has on the second printing figure, overprint point is used for holding in the overprint hole so that first printing figure and second printing figure match, overprint hole sets up on the tip pad point, overprint point sets up the below in clearance between first branch portion and the second branch portion.
The size of the end welding spot is larger than that of the inner welding spot, so that current can be better collected; the hollowed overprinting holes are formed in the end welding pad points with larger sizes, so that diversified and large-size overprinting holes can be designed, and the graphic design and the printing quality integrity are facilitated; and the overprinting points are arranged on the welding pad points at the end parts of the main grids, so that the overprinting points are different from other abnormal slurry leakage points, the overprinting accuracy of a camera can be more favorably detected, the overprinting quality of the printing is improved, and the product percent of pass is improved.
In some embodiments, the second connection gate is also disposed at a connection between the sub-gate line and the first branch portion or the second branch portion, and a width of the second connection gate gradually decreases from a position close to the first branch portion or the second branch portion to a direction of the sub-gate line.
The front pattern structure is designed into a first printing pattern and a second printing pattern which are printed step by step, a hollowed overprinting hole is designed in the first printing pattern, a solid overprinting point matched with the overprinting hole is designed in the second printing pattern, overprinting alignment is carried out, and the hollowed overprinting hole is complemented, so that the overprinting accuracy is more conveniently detected, the overprinting hole is arranged in a pad point, and no additional printing pattern is arranged outside a main grid area.
According to some preferred implementation aspects of the utility model, the secondary printing figure is including being located the peripheral frame line of vice grid line, the frame line is used for connecting vice grid line, vice grid line with the frame line junction also is provided with the second connecting grid, the width of second connecting grid is by being close to the frame line is to the direction of vice grid line reduces gradually. 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 implementation aspects of the utility model, the secondary printing figure is including being located the thin grid line of preventing absolutely between the vice grid line, prevent disconnected thin grid line perpendicular to the vice grid line sets up. 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 wafer of positive figure structure as above.
Compared with the prior art, the utility model discloses an useful part lies in: in the front pattern structure of the solar cell, the main grid line and the auxiliary grid line are printed step by step, and the two ends of the main grid line are provided with end welding points with larger size, which is beneficial to collecting current; the first connecting grid is connected to the main grid line and is printed with the main grid integrally, and non-burn-through type front silver paste is used, so that the metal composition of a coverage area is reduced, the open voltage is effectively improved, and the efficiency is improved; meanwhile, the first connecting grid is designed to be in a tapered design with the width gradually increased from the auxiliary grid line to the main grid line, so that the contact area is increased, the resistance is reduced, and better transmission and collection of current are facilitated; the V-shaped hollow area and the auxiliary grid are made of burn-through type front silver paste, a good Ag-Si alloy layer can be formed with the silicon substrate, the contact resistance is small, and the current transmission capability is good.
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 described 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 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 a schematic diagram of internal pad points in a first printed pattern according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an end pad spot having an overprinted hole in a first printed pattern according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second time printing pattern in the front pattern structure of the solar cell according to the embodiment of the present invention;
FIG. 5 is an enlarged view of portion A of FIG. 4;
FIG. 6 is an enlarged view of portion B of FIG. 4;
fig. 7 is a schematic view of a secondary grid line and a connecting portion thereon in a second pattern printing according to an embodiment of the present invention;
fig. 8 is a schematic connection diagram of a main gate line and an auxiliary gate line in a front pattern structure of a solar cell according to an embodiment of the present invention;
wherein the reference numerals include: 1-main grid line, 2-auxiliary grid line, 3-frame line, 4-breakage-proof thin grid line, 51-internal pad point, 52-end pad point, 53-first connecting grid, 54-connecting line, 7-hollow part, 71-first branch part, 72-second branch part, 81-overprint hole, 82-overprint point, 9-connecting part, 91-second connecting grid, 92-middle part and 10-silicon chip.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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 the first printed pattern shown in fig. 1 to 3 and the second printed pattern shown in fig. 4 to 7 in steps.
Specifically, as shown in fig. 1 to 3, the first-time printed pattern includes a plurality of parallel arranged main gate lines 1 (a dotted line in fig. 1 indicates one main gate line 1), and the first-time printed pattern is parallel to the side edge of the silicon wafer 10. Each group of the bus bars 1 includes end pad points 52 at end portions, inner pad points 51 spaced between the two end pad points, connecting lines 54 connecting between the end pad points and the inner pad points or between the two inner pad points, and first connecting gates 53 disposed on the pad points and the connecting lines 54, and the extending direction of the first connecting gates 53 is perpendicular to the extending direction of the connecting lines 54. The first printing of the whole integrated printing of figure, what adopted is the positive silver thick liquids of non-burn-through type.
As shown in fig. 4 to 7, the second printed pattern includes a hollow portion 7 corresponding to the end pad point 52, a plurality of sub-gate lines 2 perpendicular to the connection line, a frame line 3 located at the periphery of the sub-gate lines 2, a breakage-proof thin gate line 4 located between the sub-gate lines 2, and a connection portion 9 for reinforcing the connection of the sub-gate lines with other structures such as the connection line, the pad point, the frame line, or the hollow portion. 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. And printing and forming the whole printed pattern for the second time in an integrated manner, wherein burn-through type front silver paste is adopted.
As shown in fig. 1, each bus line 1 in this embodiment includes 7 pad points and 6 connection lines 54 disposed between the 7 pad points, and each connection line 54 has a uniform width. In other embodiments, the width of the connection line 54 in each busbar line 1 gradually increases from the middle connection line 54 to the connection lines 54 on both sides. That is, the two connection lines 54 at the middle positions of the 6 connection lines 54 have the smallest width, and the two connection lines 54 at the outermost positions have the largest width. The width setting difference of connecting wire 54 can improve the connection and the contact between pad point and the connecting wire to improve the subassembly weldability, improved the pulling force of welding the area direction, improved subassembly welding quality, reduced the subassembly rosin joint scheduling problem, and improve the subassembly product, reduce the abnormality such as reprocessing in the subassembly processing procedure, improved the subassembly productivity greatly.
In this embodiment, the hollow part 7 is a hollow part, and too much slurry is not filled therein, so that the height difference after printing is reduced, the welding quality is improved, the identification failure rate of the component welding camera detection is improved, and the component yield and the qualified rate are improved. The hollow-out portion 7 in this embodiment includes a first branch portion 71 and a second branch portion 72, and the top end and the bottom end of the first branch portion and the second branch portion are separated from each other, that is, the bottom of the hollow-out portion is disconnected and connected to the end pad point 52 to form a conductive connection. 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 finger 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. Another advantage of dimensioning the end pad spots larger is that they are better able to collect current.
In order to strengthen the connection between the structures of the graphic design and further ensure that the main grid line and the auxiliary grid line are in good contact with each other, the metal composition is reduced, the metal resistance is effectively reduced, and the current transmission is improved, so that the battery efficiency is improved, as shown in fig. 1-3 and 8, in the embodiment, on one hand, the first connecting grid 53 is arranged on the main grid line 1, and the first connecting grid 53 is used for strengthening the connection between the end portion pad point, the inner pad point, the connecting line and the like on the main grid line and the auxiliary grid line.
On the other hand, as shown in fig. 4 to 8, in the present embodiment, the connection portion 9 is provided at a position where the sub-gate line 2 is connected to the connection line 54, the pad point (end pad point and inner pad point), the hollowed portion 7 (the first branch portion 71 or the second branch portion 72), and the frame line 3. The connecting portion 9 includes a second connecting grid 91, the second connecting grid 91 is trapezoidal, the height of the trapezoidal second connecting grid 91 is parallel to the sub-grid line 2, and the width of the trapezoidal second connecting grid 91 is gradually reduced from the position close to the connecting line 54, the hollow portion 7 (the first branch portion 71 or the second branch portion 72) or the frame line 3 to the direction of the sub-grid 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.
In the embodiment, the two connecting gates are isosceles trapezoids, the height of each isosceles trapezoid connecting gate is parallel to the secondary grid line, the upper bottom of each isosceles trapezoid connecting gate is close to the secondary grid line, the lower bottom of each isosceles trapezoid connecting gate is close to the main grid line, and the length of the bottom edge of each isosceles trapezoid connecting gate, which is close to the secondary grid line, is equal to the width of the secondary grid line; that is, the width of the narrowest part is equal to the width of the minor grid line (0.02mm), and the width of the largest part is 0.06 mm.
As shown in fig. 5 to 8, the connection portion 9 further includes an intermediate portion 92 between two second connection gates 91 at a position connected to the connection line 54, the intermediate portion 92 being used for connection to the connection line 54, and the second connection gates 91 being used for connection to the side edges of the connection line 54 or the first connection gates and the sub-gate lines 2. The height of the middle portion 92 is the same as the maximum width of the trapezoidal second connection gate 91; the width of the intermediate portion 92 is greater than or equal to the width of the corresponding connecting line 54. By overlapping the intermediate portion 92 between the two second connection grids 91 and the connection line 54, the contact between the patterns is improved, and the collection and transmission of current are improved, thereby improving the efficiency of the solar cell.
As shown in fig. 8, in the present embodiment, the area of the second connection gate 91 is larger than the area of the first connection gate 53 at the position corresponding to the connection line, i.e., the second connection gate 91 completely covers the first connection gate 53. In other embodiments, at the connection of the first and second connection gates 53 and 91, the width of the corresponding second connection gate 91 is greater than the width of the first connection gate 53, i.e., the second connection gate 91 covers a portion of the first connection gate 53. A gap is reserved between one end of the first connecting grid, which is close to the auxiliary grid line, and the auxiliary grid line; a gap is formed between one end of the second connection gate 91, which is far away from the sub-gate line, and the connection line or the pad point.
As shown in fig. 2-3, by providing the first connection grid 53, the end pad point 52 is 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 pattern after step printing, thereby improving current transmission and 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 printing pattern and a second printing pattern which are printed step by step, the hollowed-out overprinting holes 81 are designed in the first printing pattern, the solid overprinting points 82 matched with the overprinting holes 81 are designed in the second printing pattern, overprinting alignment is carried out, and the solid overprinting holes 81 are complemented with the hollowed-out overprinting holes, so that the overprinting accuracy is more conveniently detected, the overprinting holes 81 are arranged in the welding pad points, and no additional printing pattern is arranged 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.
According to the method, end part pad points, internal pad points, connecting lines and a first connecting grid corresponding to a main grid line are set to be printed with patterns for the first time, and non-burn-through type front silver paste is adopted; setting the secondary grid lines and the hollow parts as a second-time printing graph, and adopting burn-through type front silver paste; the composition of metal is reduced, so that the metal resistance is effectively reduced, the current transmission between the auxiliary grid lines is improved, the battery efficiency is improved, and the problem that the current transmission capability is weakened due to the fact that the contact resistance is large in the prior art is solved; the first connecting grid is arranged on the pad point, so that contact after overprinting is improved, and the paste used in the first printing tends to improve welding tension; through the effective combination of twice printing, improve battery efficiency and welding pulling force.
The U-shaped area connecting grid of the existing distributed printing solar cell is printed with the main grid as a whole, non-burn-through type front silver paste is used, and the phenomenon that EL at the U-shaped hollow position is blackened due to the risk of disconnection with the auxiliary grid when the main grid deviates exists. The utility model discloses well earlier tip solder pad point, inside solder pad point, connecting wire and the first grid of connecting on the integrative printing main grid line, integrative printing fretwork portion, vice grid line and second grid of connecting again. The first connecting grid uses non-burn-through type positive silver paste which is integrated with the main grid line, so that the metal composition of a coverage area of the first connecting grid is reduced, the open voltage is effectively improved, the improvement of the efficiency is increased, and meanwhile, the first connecting grid and the second connecting grid are designed to be in a tapered design with the width gradually increased from the auxiliary grid to the main grid, so that the contact area is increased, the resistance is reduced, and the current at the end of the auxiliary grid is better led into the end of the main grid for output; the V-shaped hollow area and the auxiliary grid are made of burn-through type front silver paste, a good Ag-Si alloy layer can be formed with the silicon substrate, the contact resistance is small, and the current transmission capability is good. The utility model discloses a design has the advantage that current collection efficiency is high, the electrical loss is little, improves the phenomenon that U type fretwork position department EL blackened.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A front side pattern structure of a solar cell piece suitable for step-by-step printing is designed on the front side of the solar cell piece, and is formed by step-by-step printing of a first printed pattern and a second printed pattern, and is characterized in that: the first-time printed pattern comprises a plurality of main grid lines which are arranged in parallel, each main grid line comprises end bonding pads positioned at the end parts of the main grid lines, inner bonding pads distributed between the two end bonding pads at intervals, connecting lines connected between the end bonding pads and the inner bonding pads or between the two inner bonding pads, and first connecting grids arranged on the bonding pads and the connecting lines, and the extending direction of the first connecting grids is perpendicular to the extending direction of the connecting lines; the second printed graph comprises a hollow part arranged corresponding to the end part welding pad point and a plurality of auxiliary grid lines arranged in parallel, and the auxiliary grid lines are arranged perpendicular to the connecting lines; the first connecting grid is used for connecting the main grid line and the auxiliary grid line; the hollow part comprises a first branch part and a second branch part, the top ends and the bottom ends of the first branch part and the second branch part are respectively separated, the extending directions of the first branch part and the second branch part are intersected, the extending directions of the first branch part and the second branch part are crossed with the secondary grid line, and the end part welding spot is used for connecting the bottom ends of the first branch part and the second branch part; the first time of pattern printing adopts non-burn-through type positive silver paste, and the second time of pattern printing adopts burn-through type positive silver paste.
2. The front graphic structure of claim 1, wherein: the connecting part is arranged on the auxiliary grid line and comprises a second connecting grid, the position of the second connecting grid at least corresponds to the first connecting grid, and the second connecting grid is used for connecting the auxiliary grid line and the first connecting grid or the auxiliary grid line and the main grid line.
3. The front graphic structure of claim 2, wherein: the first connecting grid and/or the second connecting grid are arranged in a trapezoid shape, the height of the trapezoid connecting grid is parallel to the auxiliary grid line, the upper bottom of the trapezoid connecting grid is close to the auxiliary grid line, the lower bottom of the trapezoid connecting grid is close to the main grid line, the length of the lower bottom is larger than that of the upper bottom, and the length of the trapezoid connecting grid, which is close to the bottom side of the auxiliary grid line, is larger than or equal to the width of the auxiliary grid line.
4. The front graphic structure of claim 3, wherein: a gap is reserved between one end of the first connecting grid close to the auxiliary grid line and the auxiliary grid line; and a gap is reserved between one end of the second connecting grid, which is far away from the secondary grid line, and the connecting line or the welding pad point.
5. The front graphic structure of claim 3, wherein: the connecting part further comprises a middle part positioned between the two second connecting grids, the middle part is positioned between the bottoms of the two second connecting grids, the middle part is arranged corresponding to the connecting line, and the middle part is used for being connected with the connecting line.
6. The front graphic structure of claim 1, wherein: the width of the connecting wire in each main grid line is gradually increased from the connecting wire in the middle to the connecting wires on two sides.
7. The front graphic structure of claim 1, wherein: the size of the end welding pad point is larger than that of the inner welding pad point, an overprint hole is formed in the first printed graph, an overprint point is formed in the second printed graph, the overprint point is used for being contained in the overprint hole so that the first printed graph and the second printed graph are matched, and the overprint hole is formed in the end welding pad point; 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 of printing the pattern comprises a frame line positioned on the periphery of the secondary grid line, the frame line is used for connecting the secondary grid line, the second connecting grid is arranged at the joint of the secondary grid line and the frame line, and the width of the second connecting grid 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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| CN202121420960.5U CN214753794U (en) | 2021-06-24 | 2021-06-24 | Front side pattern structure of solar cell suitable for step-by-step printing and solar cell |
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| CN202121420960.5U CN214753794U (en) | 2021-06-24 | 2021-06-24 | Front side pattern structure of solar cell suitable for step-by-step printing and solar cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116759470A (en) * | 2023-08-23 | 2023-09-15 | 天合光能股份有限公司 | Solar cell module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116759470A (en) * | 2023-08-23 | 2023-09-15 | 天合光能股份有限公司 | Solar cell module |
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