CN110783013B - Solar cell electrode slurry, cell and preparation method of assembly of cell - Google Patents
Solar cell electrode slurry, cell and preparation method of assembly of cell Download PDFInfo
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- CN110783013B CN110783013B CN201911077101.8A CN201911077101A CN110783013B CN 110783013 B CN110783013 B CN 110783013B CN 201911077101 A CN201911077101 A CN 201911077101A CN 110783013 B CN110783013 B CN 110783013B
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- battery
- soldering flux
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- 239000011267 electrode slurry Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005476 soldering Methods 0.000 claims abstract description 57
- 230000004907 flux Effects 0.000 claims abstract description 56
- 238000003466 welding Methods 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 238000007639 printing Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 239000002003 electrode paste Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 19
- 150000007524 organic acids Chemical class 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- -1 silver-aluminum Chemical compound 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 16
- 229910052710 silicon Inorganic materials 0.000 description 15
- 239000010703 silicon Substances 0.000 description 15
- 239000002904 solvent Substances 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 238000001035 drying Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000007499 fusion processing Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- 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
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
-
- 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
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
-
- 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
- Y02E10/547—Monocrystalline silicon PV cells
-
- 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
Abstract
The invention relates to the technical field of solar cells, and particularly discloses solar cell electrode slurry, a cell and a preparation method of a component of the cell. The electrode slurry is composed of the soldering flux and the conductive slurry in a mass ratio of 1:6-8, the electrode slurry is adopted, printing is carried out on a battery substrate according to a preset pattern, a battery piece is obtained after sintering, and the obtained battery piece is used for preparing a battery assembly. The preparation method of the assembly provided by the invention can save energy consumption, reduce cost, prolong the service life of welding equipment, improve the product quality of the battery assembly, prolong the service life of the battery assembly and improve the power generation stability of the assembly.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to solar cell electrode slurry, a cell and a preparation method of a component of the cell.
Background
For the photovoltaic module to realize the power generation function, the single cells must be connected into a whole, and the common connection method is welding. However, if the welding process is not properly controlled, certain defects can be caused, and hot spots, fragments and the like can be caused during the use process. Therefore, in the production and manufacturing process of photovoltaic modules, the welding of the cell sheets becomes one of the important processes.
At present, in order to ensure the welding quality in the welding process and enable a welding strip to be welded with a battery plate quickly and perfectly, scaling powder is used as catalysis and assistance. In order to facilitate the spraying of the soldering flux on the battery piece, the soldering flux is required to be kept in a liquid state, and an alcohol solvent is added into the soldering flux. However, the alcohol solvent accounts for about 90% of the total mass of the soldering flux system, belongs to an inflammable product, has high storage requirement, great potential safety hazard and short shelf life (the alcohol solvent can expire in one week after being unsealed). In addition, the spraying amount of the soldering flux on the battery piece is not easy to control, the spraying is less easy to weld, the spraying is more likely to cause residue, a series of quality hidden dangers such as layering and residual soldering flux crystallization can be caused to the components in the later period, and the liquid soldering flux is scattered to the components of the equipment to cause corrosion, so that the service life of the equipment is influenced.
Disclosure of Invention
Aiming at the technical problems in the existing welding process, the invention provides a solar cell electrode slurry, a cell and a preparation method of a module thereof.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the solar cell electrode paste consists of a soldering flux and a conductive paste in a mass ratio of 1:6-8, wherein the mass content of a solvent in the soldering flux is less than 1%, the mass content of an organic acid is 20-25%, and the balance is conventional components of the soldering flux, such as base resin and the like, wherein the organic acid is conventional organic acid used for the soldering flux in the field.
Compared with the prior art, the electrode paste provided by the invention comprises the soldering flux and the conductive paste which are coated on the surface of the battery in the printing process, the boiling point is ensured to be more than 500 ℃ by regulating and controlling the contents of the alcohol solvent and the organic acid in the soldering flux, the phenomenon that the soldering flux is directly gasified in the sintering process to cause the incapability of carrying out the catalytic reaction of welding is avoided, and the problems of welding quality and easy corrosion of welding equipment caused by the residue of the soldering flux in the welding process can be effectively solved. In addition, due to the doping of the soldering flux, the penetration and fusion process of the conductive function in the cell can be accelerated in the sintering process, and is shortened from the original 2.0-2.5min to 0.8-1.2min, so that the fusion speed and the fusion effect of the conductive function in the cell are improved.
Further, the conductive paste is silver paste, aluminum paste or silver-aluminum paste. Coating electrode slurry formed by silver-aluminum slurry and soldering flux on a back electrode of a silicon chip; coating electrode slurry formed by aluminum slurry and soldering flux on other regions of the back surface of the silicon chip except for the back electrode; and coating electrode slurry formed by silver paste and soldering flux on the front surface of the silicon chip to ensure that a positive electrode and a negative electrode are manufactured on the surface of the battery.
Furthermore, the mass content of the conductive functional phase in the conductive slurry is 90-95%, so that an electrode is formed on the surface of the silicon wafer, and crystalline silicon atoms are fused into a molten electrode material in a certain proportion in the sintering process, so that good ohmic contact is formed.
Furthermore, the soldering flux is an organic acid type soldering flux (such as Kester952-S after solvent removal) so as to ensure that the boiling point of the soldering flux reaches over 500 ℃, so that the soldering flux can keep excellent activity at high temperature and ensure the soldering effect. If the boiling point of the soldering flux is lower than 500 ℃, desolvating is carried out on the soldering flux, so that the mass content of a solvent (an alcohol solvent) in the soldering flux is less than 1 percent, and the mass content of an organic acid is 20 to 25 percent. In addition, the content of the alcohol solvent in the soldering flux is reduced, so that the price of the soldering flux is reduced from 30 yuan/L to 10 yuan/L. And the alcohol solvent can be recycled, so that the energy consumption is saved, and the cost is reduced.
The invention also provides a preparation method of the battery piece, which comprises the following steps: and printing the electrode slurry on a battery substrate according to a preset pattern, and sintering to obtain the battery piece.
According to the preparation method of the cell, the electrode slurry consisting of the soldering flux and the conductive slurry is adopted to perform screen printing treatment on the coated silicon wafer, and in the sintering process, the soldering flux can accelerate the permeation and fusion process of the conductive function in the conductive slurry to the cell, so that the electrode and the silicon wafer form ohmic contact more quickly. In addition, active soldering flux is still remained on the surface of the sintered battery piece, so that the subsequent welding of the battery piece is facilitated, and potential safety hazards such as fire or explosion caused by flocculent derivatives generated after the liquid soldering flux is heated can be eliminated.
Furthermore, the sintering temperature is 400-450 ℃, the time is 0.8-1.2min, the sintering temperature is reduced from the traditional temperature of 600-450 ℃ to 400-450 ℃, the phenomenon that the soldering flux is directly gasified and loses activity in the sintering process is avoided, and the doping of the soldering flux can accelerate the permeation and fusion process of the conductive function in the conductive paste to the cell, so that good ohmic contact is ensured.
Further, the dosage of the electrode paste in the screen printing treatment process is 0.18-0.22mg/mm2And the positive electrode and the negative electrode are guaranteed to be manufactured on the surface of the battery.
The invention also provides a preparation method of the battery component, which comprises the following steps: and (3) directly welding the battery piece prepared by the preparation method, and packaging to obtain the battery assembly. The welding is performed by a welding process which is conventional in the art.
According to the preparation method of the battery pack, the battery piece is not required to be sprayed with the soldering flux, so that the problem that the soldering flux is easy to remain on the battery piece, and further quality hidden dangers such as layering and the like of the pack at the later stage are avoided effectively, meanwhile, adverse effects on the service life of equipment caused by the fact that the soldering flux is scattered are avoided, the quality of the battery pack is improved, the service life of welding equipment is prolonged, and meanwhile, the cost is saved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The solar cell electrode paste consists of a soldering flux and conductive paste in a mass ratio of 1:7, wherein the soldering flux is obtained by desolvating Kester952-S, the mass content of an alcohol solvent is 0.8%, and the mass content of organic acid is 23%. Respectively mixing the soldering flux with silver-aluminum paste PV505, aluminum paste RX8204 and silver paste PV16X in a mass ratio of 1:7 to respectively obtain electrode paste A, electrode paste B and electrode paste C.
A preparation method of a battery piece comprises the following steps: printing on a battery substrate according to a preset pattern by adopting the electrode paste, wherein the dosage of the electrode paste is 0.20mg/mm2Coating the electrode slurry A on a silicon wafer back electrode, and drying; coating the electrode slurry B on other regions of the back surface of the silicon wafer except the back electrode, and drying; and coating the electrode slurry C on the front surface of the silicon wafer, drying, and sintering at 420 ℃ for 1min to obtain the cell.
A method of making a battery assembly comprising the steps of: and (3) directly welding the battery pieces by adopting a conventional welding process, and packaging to obtain the battery component.
Example 2
The solar cell electrode paste consists of a soldering flux and conductive paste in a mass ratio of 1:6, wherein the soldering flux is obtained by desolvating Kester952-S, the mass content of an alcohol solvent is 0.6%, and the mass content of organic acid is 25%. And respectively mixing the soldering flux with silver-aluminum paste PV505, aluminum paste RX82121 and silver paste 159 in a mass ratio of 1:6 to respectively obtain electrode paste A, electrode paste B and electrode paste C.
A preparation method of a battery piece comprises the following steps: printing on a battery substrate according to a preset pattern by adopting the electrode paste, wherein the dosage of the electrode paste is 0.18mg/mm2Coating the electrode slurry A on a silicon wafer back electrode, and drying; coating the electrode slurry B on other regions of the back surface of the silicon wafer except the back electrode, and drying; and coating the electrode slurry C on the front surface of the silicon wafer, drying, and sintering at 450 ℃ for 0.8min to obtain the cell.
A method of making a battery assembly comprising the steps of: and (3) directly welding the battery pieces by adopting a conventional welding process, and packaging to obtain the battery component.
Example 3
The solar cell electrode paste consists of a soldering flux and conductive paste in a mass ratio of 1:8, wherein the soldering flux is obtained by desolvating Kester952-S, the mass content of an alcohol solvent is 0.9%, and the mass content of organic acid is 20%. Respectively mixing the soldering flux with silver-aluminum paste PV506, aluminum paste RX8204 and silver paste PV16X in a mass ratio of 1:8 to respectively obtain electrode paste A, electrode paste B and electrode paste C.
A preparation method of a battery piece comprises the following steps: printing on a battery substrate according to a preset pattern by adopting the electrode paste, wherein the dosage of the electrode paste is 0.22mg/mm2. Coating the electrode slurry A on a silicon wafer back electrode, and drying; coating the electrode slurry B on other regions of the back surface of the silicon wafer except the back electrode, and drying; and coating the electrode slurry C on the front surface of the silicon wafer, drying, and sintering at 400 ℃ for 1.2min to obtain the cell.
A method of making a battery assembly comprising the steps of: and (3) directly welding the battery pieces by adopting a conventional welding process, and packaging to obtain the battery component.
In order to better illustrate the characteristics of the electrode paste for solar cells and the method for preparing the cell sheet provided by the embodiment of the invention, the service life of equipment, the performance of a cell module, cost accounting and the like after the invention is adopted are summarized below.
After the method is adopted, the soldering flux spraying process is removed in the preparation process of the battery component, the corrosion to equipment can be reduced, the service life of the equipment component contacted with the soldering flux is prolonged by 2-4 years, the whole using system of the soldering flux of the welding equipment can be omitted, the cost can be saved by 16 ten thousand yuan per year, the waste soldering flux does not need to be recycled and subjected to pollution-free treatment by using capital, and the operation and maintenance cost can be saved by 11 ten thousand yuan per year. Meanwhile, the invention reduces the working temperature of the sintering furnace, and the monthly electricity charge can be saved by 1.2 ten thousand yuan. In addition, the possibility of spraying liquid soldering flux on the battery piece can be avoided, the occurrence rate of the problem of internal layering of the assembly caused by the soldering flux is reduced to 0, the adhesive force between the battery piece and a welding strip can be effectively improved by adopting the electrode slurry and the preparation method of the battery piece provided by the invention (the larger the adhesive force is, the longer the service life of the assembly is, the more stable the power generation effect is), about 0.2 newton per centimeter can be improved, the product quality of the battery assembly can be effectively improved, the service life of the battery assembly is prolonged, and the power generation stability of the assembly is improved.
According to the data, the solar cell electrode slurry, the cell and the preparation method of the module thereof can save energy consumption, reduce cost, effectively prolong the service life of welding equipment and improve the product quality of the cell module.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A solar cell electrode paste, characterized in that: the soldering flux consists of a soldering flux and conductive paste in a mass ratio of 1:6-8, wherein the mass content of an organic solvent in the soldering flux is less than 1%, and the mass content of an organic acid is 20% -25%.
2. The solar cell electrode paste of claim 1, wherein: the conductive paste is silver paste, aluminum paste or silver-aluminum paste.
3. The solar cell electrode paste of claim 1, wherein: the mass content of the conductive functional phase in the conductive slurry is 90-95%.
4. A preparation method of a battery piece is characterized by comprising the following steps: the method comprises the following steps: printing the electrode slurry according to any one of claims 1 to 3 on a battery substrate according to a preset pattern, and sintering to obtain a battery piece.
5. The method for producing a battery piece according to claim 4, characterized in that: the temperature of the sintering treatment is 400-450 ℃, and the time is 0.8-1.2 min.
6. The method for producing a battery piece according to claim 4, characterized in that: the dosage of the electrode slurry in the printing process is 0.18-0.22mg/mm2。
7. A method of making a battery assembly, comprising: directly carrying out welding treatment on the battery piece prepared by the preparation method of any one of claims 4 to 6, and packaging to obtain the battery component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911077101.8A CN110783013B (en) | 2019-11-06 | 2019-11-06 | Solar cell electrode slurry, cell and preparation method of assembly of cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911077101.8A CN110783013B (en) | 2019-11-06 | 2019-11-06 | Solar cell electrode slurry, cell and preparation method of assembly of cell |
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| CN110783013A CN110783013A (en) | 2020-02-11 |
| CN110783013B true CN110783013B (en) | 2021-06-15 |
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Citations (2)
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| JP2019122982A (en) * | 2018-01-16 | 2019-07-25 | 千住金属工業株式会社 | Flux and solder paste |
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| CN101367160B (en) * | 2008-09-26 | 2011-03-16 | 深圳市唯特偶新材料股份有限公司 | Cleaning-free lead-free solder soldering fluid without containing halide |
| JP5741809B2 (en) * | 2011-02-22 | 2015-07-01 | 三菱マテリアル株式会社 | Bonding paste and method for bonding semiconductor element and substrate |
| CN103382327B (en) * | 2012-05-02 | 2015-11-25 | 比亚迪股份有限公司 | The manufacture method of a kind of copper ink used for solar batteries and preparation method thereof, a kind of solar cell main grid and solar module |
| CN108538442B (en) * | 2015-05-27 | 2020-07-17 | 苏州市贝特利高分子材料股份有限公司 | Preparation method of high-conductivity low-temperature silver paste |
| CN105583550B (en) * | 2016-03-21 | 2018-06-15 | 苏州柯仕达电子材料有限公司 | A kind of environment protection soldering fluid |
| CN105855746B (en) * | 2016-05-13 | 2018-11-09 | 深圳市唯特偶新材料股份有限公司 | A kind of high-tensile strength photovoltaic module scaling powder |
| JP6471306B2 (en) * | 2016-08-16 | 2019-02-20 | 株式会社弘輝 | Solder composition |
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| CN109530977B (en) * | 2017-09-21 | 2021-11-19 | 株式会社田村制作所 | Flux and solder paste |
| CN110322985A (en) * | 2018-03-28 | 2019-10-11 | 上海逻骅投资管理合伙企业（有限合伙） | A kind of electrocondution slurry and its preparation method and application |
| CN110328466B (en) * | 2019-07-06 | 2021-09-21 | 苏州龙腾万里化工科技有限公司 | Halogen-free cleaning-free soldering flux |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069324A (en) * | 2010-12-29 | 2011-05-25 | 东莞永安科技有限公司 | No-clean low-splashing soldering flux for lead-free solder wire and preparation method thereof |
| JP2019122982A (en) * | 2018-01-16 | 2019-07-25 | 千住金属工業株式会社 | Flux and solder paste |
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