CN111211200B - Method for step-by-step printing of multi-main-grid solar cell - Google Patents
Method for step-by-step printing of multi-main-grid solar cell Download PDFInfo
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- CN111211200B CN111211200B CN202010106314.5A CN202010106314A CN111211200B CN 111211200 B CN111211200 B CN 111211200B CN 202010106314 A CN202010106314 A CN 202010106314A CN 111211200 B CN111211200 B CN 111211200B
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- 238000007639 printing Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 91
- 239000007787 solid Substances 0.000 claims abstract description 23
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 41
- 229910052709 silver Inorganic materials 0.000 claims description 35
- 239000004332 silver Substances 0.000 claims description 35
- 239000011521 glass Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- WBKYGCZSBGEBFP-UHFFFAOYSA-N 5-butoxy-3-butoxycarbonyl-3-hydroxy-5-oxopentanoic acid Chemical compound CCCCOC(=O)CC(O)(CC(O)=O)C(=O)OCCCC WBKYGCZSBGEBFP-UHFFFAOYSA-N 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000001856 Ethyl cellulose Substances 0.000 claims description 3
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 3
- 239000000020 Nitrocellulose Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 claims description 3
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 3
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001249 ethyl cellulose Polymers 0.000 claims description 3
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 3
- 229920001220 nitrocellulos Polymers 0.000 claims description 3
- XRCRWCVBMHENNE-UHFFFAOYSA-N sym-di-n-butyl citrate Natural products CCCCOC(=O)CC(O)(C(O)=O)CC(=O)OCCCC XRCRWCVBMHENNE-UHFFFAOYSA-N 0.000 claims description 3
- 229940116411 terpineol Drugs 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/22—Metallic printing; Printing with powdered inks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a multi-main grid solar cell step-by-step printing method, which comprises the following steps: printing for the first time, wherein a first printing pattern is formed on the front surface of the battery, and the first printing pattern comprises rectangular welding spots; printing for the second time, wherein a second printing pattern is formed on the front surface of the battery, the second printing pattern comprises hollow welding points, a main grid and an auxiliary grid, and the hollow welding points are arranged at the lap joint of the main grid and the auxiliary grid; the hollow welding points comprise hollow parts and solid parts, the solid parts are overlapped with the rectangular welding points to form four rectangular overlapping parts, and the hollow parts expose the rest parts of the rectangular welding points. According to the step-by-step printing method, the rectangular welding spots are formed through first printing, the hollowed welding spots, the main grid and the auxiliary grid are formed through second printing, and the hollowed welding spots and the rectangular welding spots are overlapped to form the rectangular overlapping part during second printing, so that the problem of overlapping of the main grid and the auxiliary grid is solved, the tensile force of the welding spots on the main grid is improved, and the yield and the service life of a battery assembly are improved.
Description
Technical Field
The invention relates to the field of solar cell manufacturing, in particular to a multi-main-grid solar cell step-by-step printing method.
Background
At present, the main grid of the conventional solar cell with multiple main grids is designed by adding welding points to the narrow main grid, a circular welding strip with the diameter of 0.3-0.4 mm is adopted for welding the cell at the end of the component, and the welding mode is that the circular welding strip is welded on the welding points of the main grids of the solar cell with the multiple main grids. The contact area of the circular welding strip and the welding point is small during welding, so that the condition of insufficient welding or falling is easy to occur, and the requirement on the tension of the positive silver main grid at the welding point is high. In order to ensure good contact of the auxiliary grid, the conventional single printing adopts burn-through silver paste to print the main grid and the auxiliary grid simultaneously, and the tension of welding points on the main grid is lower.
In order to improve the efficiency of the battery, improve the tensile force of welding points on the main grids and reduce the unit consumption of positive silver, the multi-main-grid solar battery is formed by adopting a step-by-step printing or secondary printing method. The conventional step-by-step printing is to print the main grid by using the non-contact silver paste with low line resistance, and then print the auxiliary grid by using the silver paste with good shaping and low contact resistance, so that the tension of a welding spot on the main grid can be improved, the photoelectric conversion efficiency of the battery is improved, and the unit consumption of the positive silver is reduced. However, the resistance at the lap joint of the main grid and the auxiliary grid is too high, so that certain photoelectric conversion efficiency loss is caused to the battery, and the height of the grid line at the lap joint is too high, so that an aluminum back field on the back of the battery is easily scratched when the battery pieces are packaged; in addition, the positive silver slurry system of the vice bars and the main grid of overlap joint is different, and the battery makes the subassembly back and can appear the risk in subassembly reliability tests such as TC, DH, HF, causes the subassembly life-span to hang down.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-main-grid solar cell step-by-step printing method, which can improve the tension of welding spots and improve the yield and the service life of a cell assembly.
The technical problem to be solved by the invention is to provide a method for printing a multi-main-grid solar cell step by step, so that the cost is reduced.
In order to solve the technical problem, the invention provides a multi-main-grid solar cell step-by-step printing method, which comprises the following steps:
printing for the first time, wherein a first printing pattern is formed on the front surface of the battery, and the first printing pattern comprises rectangular welding spots;
printing for the second time, wherein a second printing pattern is formed on the front surface of the battery, the second printing pattern comprises hollow welding points, a main grid and an auxiliary grid, and the hollow welding points are arranged at the lap joint of the main grid and the auxiliary grid;
the hollow welding points comprise hollow parts and solid parts, the solid parts are overlapped with the rectangular welding points to form four rectangular overlapping parts, and the hollow parts expose the rest parts of the rectangular welding points.
As an improvement of the scheme, the solid parts are positioned at the periphery of the hollow-out part, the overlapped part of the solid parts and the rectangular welding points is a first solid part, and the rest part is a second solid part.
As an improvement of the above solution, the rectangular welding spot has a length of L1 and a width of W1, where L1= 0.5-2.0 mm and W1= 0.3-1.5 mm.
As a modification of the above solution, the rectangular overlapping part has a length of L2 and a width of W2, where L2=0.05 to 0.25mm and W2=0.1 to 0.4mm.
In an improvement of the above aspect, a gap is provided between the rectangular welding point and the second solid portion along the length direction of the rectangular welding point, and the width of the gap is W3, where W3= 0.01-0.05 mm.
As an improvement of the scheme, the secondary printed pattern further comprises a trapezoidal anti-breaking grid at the lap joint of the main grid and the auxiliary grid, wherein the trapezoidal anti-breaking grid is of a trapezoidal structure and is connected to the main grid and the auxiliary grid.
As an improvement of the scheme, the first printed pattern further comprises a first printed alignment hole, the second printed pattern further comprises a second printed alignment hole, and when the second printed pattern is printed for the second time, the second printed alignment hole is aligned with the first printed alignment hole so as to align and print the hollowed-out welding points on the rectangular welding points.
As an improvement of the scheme, when printing for the first time, a first silver paste is adopted for printing to form a first printing pattern;
during the second printing, a second silver paste is adopted for printing to form a second printing pattern;
the first silver paste is a non-contact silver paste, and the second silver paste is a plastic silver paste.
As an improvement of the scheme, the first silver paste is composed of the following raw materials in percentage by mass: 81-90% of silver powder, 0.5-2% of adhesive, 4-7% of solvent and 1-3% of glass powder;
the second silver paste is composed of the following raw materials in percentage by mass: 86 to 93 percent of silver powder, 1 to 3 percent of adhesive, 3 to 5 percent of solvent and 2 to 4 percent of glass powder.
As an improvement of the scheme, the adhesive is made of one or more of ethyl cellulose, styrene and nitrocellulose;
the solvent is prepared from one or more of terpineol, dibutyl citrate and acetate;
the glass powder comprises B 2 O 3 、SiO 2 、Al 2 O 3 And V 2 O 5 . The implementation of the invention has the following beneficial effects:
according to the step-by-step printing method, the rectangular welding spots are formed through first printing, the hollowed welding spots, the main grid and the auxiliary grid are formed through second printing, and the hollowed welding spots and the rectangular welding spots are overlapped to form the rectangular overlapping part during second printing, so that the problem of overlapping of the main grid and the auxiliary grid is solved, the tensile force of the welding spots on the main grid is improved, and the yield and the service life of a battery assembly are improved.
In addition, the hollow parts of the hollow welding spots expose the rest parts of the rectangular welding spots, and the height of the grid line is effectively reduced.
Furthermore, along the length direction of the rectangular welding spots, gaps are formed between the long edges of the rectangular welding spots and the second solid parts, and therefore the problem of insufficient soldering caused by uneven welding spot height of the welding strip in the welding direction can be avoided.
Furthermore, the step-by-step printing method has low requirement on printing precision, can adopt a lower mesh of screen printing welding spots, can be compatible with positive electrode printing of 6-12 main grid batteries, has wide application range, simple and convenient operation and lower cost, and has great popularization and application values.
Drawings
FIG. 1 is a schematic illustration of a first pass of a printed graphic of the present invention;
FIG. 2 is a schematic illustration of a second pass of the printed pattern of the present invention;
FIG. 3 is a schematic view of the overlap of rectangular solder points and stencil solder points in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a method for printing a multi-main-grid solar cell step by step, which comprises the following steps:
1. printing for the first time;
a first time printing pattern is formed on the front surface of the battery, and the first time printing pattern includes rectangular welding spots 11 and first time printing alignment holes 12, see fig. 1.
Preferably, the rectangular welding spots of the invention are distributed in an array.
2. Printing for the second time;
and forming a second printing pattern on the front surface of the battery, wherein the second printing pattern comprises hollow welding points 21, a main grid 22, an auxiliary grid 23, a trapezoidal anti-breaking grid 24 at the joint of the main grid and the auxiliary grid and a second printing alignment hole 25, and referring to fig. 2. The hollow welding points 21 are arranged at the connection positions of the main grid 22 and the auxiliary grid 23.
Specifically, during the second printing, the second printing alignment holes 25 are aligned with the first printing alignment holes 12, so as to align and print the hollow solder points 21 on the rectangular solder points 11.
Specifically, when printing for the first time, printing by adopting first silver paste to form a first-time printing pattern; and during the second printing, printing by adopting a second silver paste to form a second printing pattern.
Preferably, the silver paste with a non-contact type and low line resistance is used as the first silver paste to print to form the rectangular welding spot, so that the tension of the rectangular welding spot is high, the metal composition of a printing area of the rectangular welding spot is low, and the conversion efficiency of the battery is improved.
According to the invention, silver paste with good shaping and low contact resistance is used as second silver paste to print the auxiliary grid, the main grid and the hollowed-out welding points on the silicon chip, so that the auxiliary grid has high height-to-width ratio and low series resistance, and the conversion efficiency of the battery is favorably improved.
According to the invention, the first silver paste has the characteristics of low line resistance and the second silver paste has the characteristics of low contact resistance by adjusting the ratio of the components in the first silver paste to the second silver paste. Preferably, the first silver paste is composed of the following raw materials in percentage by mass: 81-90% of silver powder, 0.5-2% of adhesive, 4-7% of solvent and 1-3% of glass powder; the second silver paste is composed of the following raw materials in percentage by mass: 86 to 93 percent of silver powder, 1 to 3 percent of adhesive, 3 to 5 percent of solvent and 2 to 4 percent of glass powder.
Specifically, the adhesive is made of one or more of ethyl cellulose, styrene and nitrocellulose; the solvent is prepared from one or more of terpineol, dibutyl citrate and acetate; the glass powder comprises B 2 O 3 、SiO 2 、Al 2 O 3 And V 2 O 5 。
Referring to fig. 3, the hollow-out solder joint 21 includes a hollow-out portion 211 and an entity portion 212, the entity portion 212 overlaps the rectangular solder joint 11 to form a rectangular overlapping portion, and the hollow-out portion 211 exposes the rest of the rectangular solder joint 21.
In order to further improve the tensile force of the welding points on the main grid, the rectangular welding points and the hollow welding points are overlapped to form 4 rectangular overlapped parts.
The rectangular overlapping part of the invention is beneficial to forming good lap joint between the rectangular welding spot 11 and the main grid 22 and reducing lap joint resistance.
Specifically, the solid portion 212 is located around the hollow portion 211, a portion of the solid portion 212 overlapping the rectangular welding point 11 is a first solid portion, and the rest is a second solid portion.
Preferably, a gap is formed between the rectangular welding spot 11 and the second solid part along the length direction of the rectangular welding spot 11, so that the problem of insufficient soldering caused by uneven welding spot height of the welding strip in the welding direction can be avoided.
The dimensions of the rectangular solder and the rectangular overlapping portion have important influences on the bonding of the main and auxiliary grids, the tensile strength of the solder on the main grid, and the photoelectric conversion efficiency of the cell.
If the area of the rectangular welding spot is too large, the resistance is too high; if the area of the rectangular welding spot is too small, the tension is too small. If the area of the rectangular overlapping part is too large, the resistance of the lap joint of the main grid and the auxiliary grid is too high; if the area of the rectangular overlapping portion is too small, the main and sub-grids are poorly combined.
Specifically, the length of the rectangular welding point is L1, and the width of the rectangular welding point is W1, wherein L1= 0.5-2.0 mm, and W1= 0.3-1.5 mm. Preferably, L1=0.9mm, w1=0.5mm, or L1=1.2mm, w1=0.8mm, or L1=1.6mm, and w1=1.2mm.
The rectangular overlapping part has a length of L2 and a width of W2, wherein L2= 0.05-0.25mm, and W2= 0.1-0.4 mm. Preferably, L2=0.1mm, w2=0.2mm, or L2=0.15mm, w2=0.25mm, or L2=0.2mm, w2=0.3mm.
Further, the width of the gap between the long side of the rectangular pad and the second solid portion is W3, preferably, W3 < W2, and W3=0.01 to 0.05mm. More preferably, L3=0.02mm, or L3=0.035mm, or L3=0.05mm.
In order to prevent the main grid 22 and the auxiliary grid 23 from being broken, a trapezoidal breakage-proof grid 24 is arranged at the joint of the main grid 22 and the auxiliary grid 23. The ladder-shaped breakage-proof barrier 24 is of a ladder-shaped structure and is connected to the main barrier 22 and the auxiliary barrier 23.
The step printing method not only solves the problem of lapping of the main grid and the auxiliary grid, but also improves the tensile force of the welding spot on the main grid, the conventional single-time printing welding spot mechanical welding tensile force is 1.25-2.5N/mm, the step printing method can improve the yield and the service life of the battery component, the printing precision requirement is not high, the lower mesh screen printing welding spot can be adopted, the positive electrode printing of the 6-12 main grid battery can be compatible, the application range is wide, the operation is simple and convenient, the cost is lower, and the method has great popularization and application value.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A method for multi-master-grid solar cell step-by-step printing is characterized by comprising the following steps:
the first printing is carried out, wherein a first printing pattern is formed on the front surface of the battery, and the first printing pattern comprises rectangular welding spots and first printing alignment holes;
printing for the second time, wherein a second printing pattern is formed on the front side of the battery, the second printing pattern comprises hollow welding points, a main grid, an auxiliary grid and second printing alignment holes, and the hollow welding points are arranged at the lap joint of the main grid and the auxiliary grid;
the hollow welding points comprise hollow parts and solid parts, the solid parts are overlapped with the rectangular welding points to form rectangular overlapped parts, the hollow parts expose the rest parts of the rectangular welding points, the overlapped parts of the solid parts and the rectangular welding points are first solid parts, and the rest parts are second solid parts; a gap is arranged between the rectangular welding point and the second solid part along the length direction of the rectangular welding point, the width of the hollowed-out welding point is larger than that of the main grid, and the width of the rectangular welding point is larger than that of the main grid;
during the second printing, the second printing alignment hole is aligned with the first printing alignment hole so as to align and print the hollowed-out welding points on the rectangular welding points;
6 to 12 main grids are arranged on the multi-main-grid solar cell.
2. The method for multi-master-grid solar cell step printing according to claim 1, wherein the solid portion is located around the hollowed-out portion.
3. The method for multi-main grid solar cell step printing according to claim 1, wherein the rectangular welding spot has a length L1 and a width W1, wherein L1=0.5 to 2.0mm, and W1=0.3 to 1.5mm.
4. The method for multi-grid solar cell step printing according to claim 3, wherein the rectangular overlapping part has a length L2 and a width W2, wherein L2=0.05 to 0.3mm, and W2=0.1 to 0.4mm.
5. The method for multi-master-grid solar cell step printing according to claim 2, wherein the width of the gap is W3, wherein W3=0.01 to 0.05mm.
6. The method for step printing of a multi-primary grid solar cell according to claim 1, wherein the second printed pattern further comprises a trapezoidal anti-breaking grid at the overlapping part of the primary grid and the secondary grid, wherein the trapezoidal anti-breaking grid is in a trapezoidal structure and is connected to the primary grid and the secondary grid.
7. The method for multi-master-grid solar cell step printing according to claim 1, wherein, in the first printing, a first silver paste printing is adopted to form a first printing pattern;
during the second printing, a second silver paste is adopted for printing to form a second printed pattern;
the first silver paste is a non-contact silver paste, and the second silver paste is a plastic silver paste.
8. The method for multi-master-grid solar cell step printing according to claim 7, wherein the first silver paste is composed of the following raw materials in percentage by mass: 81% -90% of silver powder, 0.5% -2% of adhesive, 4% -7% of solvent and 1% -3% of glass powder;
the second silver paste is composed of the following raw materials in percentage by mass: 86% -93% of silver powder, 1% -3% of adhesive, 3% -5% of solvent and 2% -4% of glass powder.
9. The method for multi-master-grid solar cell step printing according to claim 8, wherein the binder is made of one or more of ethyl cellulose, styrene and nitrocellulose;
the solvent is prepared from one or more of terpineol, dibutyl citrate and acetate;
the glass powder comprises B 2 O 3 、SiO 2 、Al 2 O 3 And V 2 O 5 。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010106314.5A CN111211200B (en) | 2020-02-21 | 2020-02-21 | Method for step-by-step printing of multi-main-grid solar cell |
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| CN202010106314.5A CN111211200B (en) | 2020-02-21 | 2020-02-21 | Method for step-by-step printing of multi-main-grid solar cell |
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| CN111211200B true CN111211200B (en) | 2023-01-13 |
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|---|---|---|---|---|
| CN112117335A (en) * | 2020-09-29 | 2020-12-22 | 江苏爱康能源研究院有限公司 | Method for printing welding points on MBB main gate of crystalline silicon heterojunction solar cell |
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