CN110323300B - Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly - Google Patents
Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly Download PDFInfo
- Publication number
- CN110323300B CN110323300B CN201910465318.XA CN201910465318A CN110323300B CN 110323300 B CN110323300 B CN 110323300B CN 201910465318 A CN201910465318 A CN 201910465318A CN 110323300 B CN110323300 B CN 110323300B
- Authority
- CN
- China
- Prior art keywords
- solar cell
- back contact
- precursor
- contact solar
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002243 precursor Substances 0.000 claims abstract description 103
- 239000011267 electrode slurry Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 238000007639 printing Methods 0.000 claims abstract description 4
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- 238000002161 passivation Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 11
- 239000011230 binding agent Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000006256 anode slurry Substances 0.000 description 2
- 239000006257 cathode slurry Substances 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0516—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of 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
-
- 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
Abstract
The application discloses a back contact lamination solar cell string, a manufacturing method thereof and a lamination solar cell assembly, which comprises the following steps: forming a plurality of through holes on the edge of one side of a back contact solar cell, wherein the through holes penetrate through the back contact solar cell along the thickness direction of the back contact solar cell; printing positive electrode slurry and negative electrode slurry on the back surface of the back contact solar cell, and drying the positive electrode slurry and the negative electrode slurry to form a positive electrode precursor and a negative electrode precursor; sequentially overlapping and arranging a plurality of back contact solar cells so that two adjacent back contact solar cells have an overlapping region, and the through holes of the back contact solar cells positioned below are positioned in the overlapping region; and sintering and molding the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor together to obtain a positive electrode, a negative electrode and a perforated electrode. The lamination process flow is simplified, and the structure is simple.
Description
Technical Field
The invention relates to the photovoltaic field, in particular to the field of back contact solar cell modules, and particularly relates to a back contact laminated solar cell string, a manufacturing method thereof and a laminated solar cell module.
Background
The technology of a laminated assembly (also called as a laminated tile assembly) is a novel assembly design scheme, and battery pieces are stacked and arranged, are connected into a battery string through materials such as conductive adhesive, tin paste and the like, and are laminated into the assembly after series-parallel typesetting. Through improving the interconnection structural design of battery piece, can arrange more battery pieces in limited area, improve the utilization ratio of space area and the generated power of subassembly.
At present, back contact solar cells (such as IBC, MWT and EWT solar cells) are widely concerned, and because the front side of the back contact solar cell is not provided with main grid lines or even any electrode patterns, the positive electrode and the negative electrode are arranged on the back side of the cell, so that the shading of the cell is reduced, the short-circuit current of the cell is effectively increased, and the energy conversion efficiency of the cell is improved.
The electrodes of the existing back contact solar cells are arranged on the back of the cell and cannot be directly stacked and arranged like the traditional crystalline silicon solar cells to form a cell string by connecting the positive electrodes and the negative electrodes of the adjacent cells through conductive adhesives.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a back contact laminated solar cell string, a method for manufacturing the same, and a laminated solar cell module, which are capable of implementing a lamination arrangement of back contact solar cells.
In a first aspect, the present invention provides a method for manufacturing a back contact laminated solar cell module, comprising the steps of:
forming a plurality of through holes on the edge of one side of a back contact solar cell, wherein the through holes penetrate through the back contact solar cell along the thickness direction of the back contact solar cell; printing positive electrode slurry and negative electrode slurry on the back surface of the back contact solar cell, and drying the positive electrode slurry and the negative electrode slurry to form a positive electrode precursor and a negative electrode precursor;
sequentially overlapping and arranging a plurality of back contact solar cells so that two adjacent back contact solar cells have an overlapping region, and the through holes of the back contact solar cells positioned below are positioned in the overlapping region;
filling electrode slurry into the through holes of the overlapped back contact solar cell pieces, and drying the electrode slurry to form a perforated electrode precursor; one end of the perforated electrode precursor is connected with one of the anode precursor and the cathode precursor of one back-contact solar cell, and the other end of the perforated electrode precursor is connected with the other of the anode precursor and the cathode precursor of the adjacent back-contact solar cell;
and sintering and molding the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor together to obtain a positive electrode, a negative electrode and a perforated electrode.
In a second aspect, the back contact laminated solar cell string of the present invention is obtained by a method for manufacturing a back contact laminated solar cell string.
In a third aspect, the back contact laminated solar cell module of the present invention comprises a plurality of back contact laminated solar cell strings electrically connected.
According to the technical scheme provided by the embodiment of the application, a plurality of through holes are formed in the edge of the back contact solar cell, and the positive electrode slurry and the negative electrode slurry are printed on the back surface of the back contact solar cell to form a positive electrode precursor and a negative electrode precursor; sequentially overlapping and arranging a plurality of back contact solar cells, and filling electrode slurry into the through holes to form a perforated electrode precursor; and then, the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor are formed by one-step sintering, and the perforated electrode formed by sintering the electrode slurry can lead the positive electrode or the negative electrode on the back surface of the back contact solar cell piece out to the front surface of the back contact solar cell piece, so that a plurality of back contact solar cell pieces are stacked and arranged, the stacking process flow is simplified, the structure is simple, the reliability is high, and the problem that the conventional back contact solar cell pieces are difficult to stack and arrange can be solved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a back side of a back contact solar cell sheet of a back contact laminated solar cell string according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a front side of a back contact solar cell of a back contact laminated solar cell string according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a back contact laminated solar cell string side surface according to an embodiment of the invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 3, a method for manufacturing a back contact laminated solar cell string according to an embodiment of the present invention includes the following steps:
forming a plurality of through holes on the edge of one side of the back-contact solar cell piece 10, wherein the through holes penetrate through the back-contact solar cell piece 10 along the thickness direction of the back-contact solar cell piece 10; printing positive electrode slurry and negative electrode slurry on the back surface of the back contact solar cell piece 10, and drying the positive electrode slurry and the negative electrode slurry to form a positive electrode precursor and a negative electrode precursor;
a plurality of back contact solar cell pieces 10 are sequentially overlapped and arranged, so that two adjacent back contact solar cell pieces 10 have an overlapping region, and the through hole of the back contact solar cell piece 10 positioned below is positioned in the overlapping region;
filling electrode slurry into the through holes of the overlapped back contact solar cell pieces 10, and drying the electrode slurry to form a perforated electrode precursor; one end of the perforated electrode precursor is connected with one of the anode precursor and the cathode precursor of one back-contact solar cell, and the other end of the perforated electrode precursor is connected with the other of the anode precursor and the cathode precursor of the adjacent back-contact solar cell 10;
the positive electrode precursor, the negative electrode precursor, and the perforated electrode precursor are sintered and molded together to obtain a positive electrode, a negative electrode, and a perforated electrode 11.
The step of forming the through hole and the step of forming the positive and negative electrode precursors do not have a special sequence, and the through hole may be formed first and then the positive and negative electrode precursors are formed, or the through hole may be formed first and then the positive and negative electrode precursors are formed.
In the embodiment of the invention, the positive electrode slurry and the negative electrode slurry are printed on the back surface of the back contact solar cell piece 10, the through hole is filled with the electrode slurry, and the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor are sintered and formed together, so that the process of the back contact solar cell assembly lamination process can be simplified, and the back contact solar cell assembly lamination process has a simple structure and high reliability.
If the through hole is intersected with the positive electrode, the perforated electrode 11 leads the positive electrode on the back surface of the back contact solar cell piece 10 to the front surface, and the perforated electrode 11 is connected with the negative electrode on the back surface of another adjacent back contact solar cell piece 10, so that two adjacent back contact solar cell pieces 10 are connected in series; if the through hole is intersected with the negative electrode, the perforated electrode 11 leads the negative electrode on the back surface of the back contact solar cell piece 10 to the front surface, and the perforated electrode 11 is connected with the positive electrode on the back surface of another adjacent back contact solar cell piece 10, so that two adjacent back contact solar cell pieces 10 are connected in series. The perforated electrode 11 is electrically connected with the anode of one back contact solar cell piece 10 and the cathode of the other solar cell piece respectively, and is realized by one-time sintering, so that the manufacturing process of the back contact laminated solar cell module is greatly simplified, and the equipment cost and the production cost are reduced.
The lamination process of the back contact lamination solar cell module reduces series resistance and resistance loss and obviously improves the power of the lamination module.
The positive electrode slurry and the negative electrode slurry are printed on the back surface of the back contact solar cell piece 10, but not only the positive electrode slurry and the negative electrode slurry are printed on the back surface of the back contact solar cell piece 10 in a screen printing mode, and the positive electrode slurry and the negative electrode slurry are dried to form a positive electrode precursor and a negative electrode precursor, so that the accuracy of the positive electrode and the negative electrode can be improved. Specifically, the positive electrode slurry and the negative electrode slurry are dried to dry the positive electrode slurry and the negative electrode slurry, so that the positions of the positive electrode and the negative electrode on the back surface of the back contact solar cell piece 10 can be fixed; it should be noted that, since the positive electrode precursor and the negative electrode precursor are not sintered, no effective electrical connection is formed at this time; the through-hole is filled with the electrode paste, and the electrode paste is dried to form a through-hole electrode precursor, and it should be noted that the through-hole electrode precursor is not effectively electrically connected. After the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor are sintered and molded, the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor respectively form a positive electrode, a negative electrode and a perforated electrode, and meanwhile, effective electric connection is formed among the positive electrode, the negative electrode and the perforated electrode.
Arrange polylith back contact solar cell piece 10 in order to there is overlap region adjacent back contact solar cell piece 10, namely carries out the overlapping in order with polylith back contact solar cell piece 10 and arranges, does not have the clearance between the back contact solar cell piece 10, make full use of the usable area in subassembly surface, promoted the conversion efficiency and the output efficiency of subassembly. The light receiving surface of the back contact solar cell 10 is not provided with any electrode to block light, so that the efficiency of the module can be improved.
The back contact laminated solar cell assembly can be one or multiple rows of laminated cell strings, the cells of each row of laminated cell strings are connected in series, and different rows of laminated cell strings are connected in parallel or in series.
One end of the perforated electrode precursor is connected with one of the anode precursor and the cathode precursor of one back-contact solar cell, and the other end of the perforated electrode precursor is connected with the other of the anode precursor and the cathode precursor of the adjacent back-contact solar cell, specifically, the anode precursor of one back-contact solar cell and the cathode precursor of the other back-contact solar cell are respectively connected with two ends of the perforated electrode precursor, so that after the anode precursor, the cathode precursor and the perforated electrode precursor are sintered, the anode of one back-contact solar cell and the cathode of the other back-contact solar cell in the two adjacent back-contact solar cells are electrically connected through the perforated electrode, that is, the two adjacent back-contact solar cells are connected in series.
In fig. 1, the perforated electrode 11 is provided at an end of the positive electrode 12 on the back surface of the back contact solar cell sheet, and the perforated electrode 11 is not in contact with the negative electrode 13 on the back surface of the back contact solar cell sheet.
The positive electrode slurry, the negative electrode slurry and the electrode slurry filled in the through holes can be the same electrode slurry or different electrode slurries. The sintering temperatures of the anode slurry, the cathode slurry and the electrode slurry filled in the through hole are all 550-850 ℃, so that when the anode precursor, the cathode precursor and the perforated electrode precursor are sintered and formed together, the highest sintering temperatures of the anode precursor, the cathode precursor and the perforated electrode precursor are used as the sintering temperatures of the anode precursor, the cathode precursor and the perforated electrode precursor during the sintering and forming together, and energy waste caused by overlarge difference of the sintering temperatures is avoided; meanwhile, the sintering temperature of the anode slurry, the cathode slurry and the electrode slurry filled in the through holes is 550-850 ℃, the sintering temperature is not too high, the thermal damage of the sintering process to the solar cell can be reduced, and the yield of the back-contact solar cell is improved.
Furthermore, the through hole is located at the end of the anode precursor or the end of the cathode precursor, that is, the anode precursor or the cathode precursor does not extend after extending to the through hole, so that the through hole can be close to the edge of the cell, the overlapping area is small during overlapping, the light receiving surface of the back contact solar cell 10 is prevented from being affected, and the output efficiency of the back contact laminated solar cell module is ensured.
Further, the back contact solar cell 10 is a whole cell or a sub-solar cell obtained by cutting the whole cell in equal parts, when the back contact solar cell sheet 10 is a sub-solar cell sheet obtained by equally dividing a whole sheet of the cell sheet, the back contact solar cell sheet 10 may be a half solar cell sheet, a third solar cell sheet, a fourth solar cell sheet, a fifth solar cell sheet or a sixth solar cell sheet formed by cutting an entire sheet of the solar cell sheet in a direction parallel to the fine grid line of the solar cell sheet in a halving, trisecting, quartering, fiftiering or sixttiering manner, and the entire sheet of the solar cell sheet is cut into a plurality of sub-solar cell sheets, so that the resistance of the single back contact solar cell sheet 10 can be reduced, the current of each string of the solar cell groups can be reduced, the influence of the resistance loss of the electrodes can be reduced, and the output power of the solar cell modules can be improved.
Furthermore, the through holes are round, square or oval, so that the through holes can be conveniently processed, the bonding strength between the perforated electrodes 11 and the back contact solar cell piece 10 is ensured, and the reliability of the back contact laminated solar cell module is improved.
Furthermore, the through hole is formed in a laser drilling mode, and the machining precision and accuracy of the through hole can be improved.
Furthermore, the width of the overlapping area is 0.1-3mm, so that the connection stability of the adjacent back contact solar cell pieces 10 through the perforated electrodes 11 can be ensured, meanwhile, the loss caused by the fact that the perforated electrodes 11 shield the light emitting surfaces of the solar cell pieces too much is avoided, the resistance loss is reduced, and the power of the back contact laminated solar cell module is improved. If the width of the overlapping area of the adjacent back contact solar cell pieces is less than 0.1mm, the through holes are difficult to process, the area of the common electrode is small, and the transmission of current and the contact reliability are influenced; if the width of the overlapping region of the adjacent back contact solar cell pieces 10 is greater than 3mm, the photoelectric conversion efficiency of solar energy cannot be significantly improved because the area of the overlapping region is large, and the larger the area of the overlapping region is, the more the invalid area of the cell pieces is. It is possible, but not limited to, that the width of the overlapping region of the adjacent cell pieces is 0.5 to 2 mm.
Furthermore, the method also comprises the following steps of,
texturing, diffusing, doping, polishing, depositing a passivation film and opening holes on a silicon wafer to obtain a back contact solar cell piece 10, and preprocessing the silicon wafer to obtain the back contact solar cell piece 10.
Further, before sintering and molding the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor together, the method also comprises the following steps,
and coating an inorganic adhesive 20 between the through holes or around the through holes, wherein the inorganic adhesive 20 is positioned in an overlapping region, the inorganic adhesive 20 is positioned between two adjacent back contact solar cell pieces 10, and when the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor are sintered and formed together, the inorganic adhesive 20 can be sintered and formed together, so that the two adjacent back contact solar cell pieces 10 form stable connection in the overlapping region, and the reliability of the back contact laminated solar cell module is improved. Meanwhile, the inorganic adhesive 20 may also serve as an insulating function, and may electrically isolate the perforated electrode 11 from electrodes of different polarities; for example, the negative electrode of the lower back-contact solar cell sheet 10 is electrically connected to the through-hole electrode 11, the positive electrode of the upper back-contact solar cell sheet 10 is electrically connected to the through-hole electrode 11, and the inorganic binder 20 is located between the positive electrode and the negative electrode of the upper back-contact solar cell sheet 10, so that the through-hole electrode 11 and the negative electrode of the upper back-contact solar cell sheet 10 are connected to each otherAnd (4) electrically isolating. The inorganic binder 20 contains SiO as a main component2、B2O3、Bi2O3ZnO, the inorganic binder 20 has a thermal expansion coefficient close to that of the silicon substrate of the cell, which can avoid the hidden cracks and fragments caused by the mismatch of thermal expansion coefficients after sintering.
The back of the back contact solar cell piece 10 is provided with an anode thin grid line, a cathode thin grid line, a P-type doping area and an N-type doping area, wherein the anode thin grid line is in contact with the P-type doping area, the cathode thin grid line is in contact with the N-type doping area, the anode thin grid line is electrically connected with an anode connecting electrode, and the cathode thin grid line is electrically connected with a cathode connecting electrode.
The structure of the positive electrode and the negative electrode of each back-contact solar cell piece 10 is shown in fig. 1, further, before the back-contact solar cell pieces 10 are sequentially arranged in an overlapped manner, two adjacent back-contact solar cell pieces 10 are reversely placed, so that a positive electrode precursor of any one back-contact solar cell piece in the two adjacent back-contact solar cell pieces is collinear with a negative electrode precursor of the other back-contact solar cell piece, the positive electrode and the negative electrode of the two adjacent back-contact solar cell pieces can be just opposite, and the two adjacent back-contact solar cell pieces can be electrically connected conveniently.
Another embodiment of the invention is a back contact laminated solar cell string obtained by the manufacturing method of the back contact laminated solar cell string.
In the embodiment of the invention, the back contact solar cell lamination arrangement in the cell string is obtained by the manufacturing method of the back contact lamination solar cell string, the structure is simple, and the reliability is high.
Another embodiment of the present invention is a back contact laminated solar cell module including a plurality of back contact laminated solar cell strings electrically connected.
In the embodiment of the invention, the back contact solar cells in the cell string are arranged in a laminated manner, so that the structure is simple and the reliability is high. Series resistance and resistance loss can be reduced, and the power of the component is improved.
In one embodiment of the invention, the number of through holes in a single back contact laminated solar cell module is 60 to 3000.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (9)
1. A method for manufacturing a back contact laminated solar cell string is characterized by comprising the following steps:
forming a plurality of through holes on the edge of one side of a back contact solar cell, wherein the through holes penetrate through the back contact solar cell along the thickness direction of the back contact solar cell; printing positive electrode slurry and negative electrode slurry on the back surface of the back contact solar cell, and drying the positive electrode slurry and the negative electrode slurry to form a positive electrode precursor and a negative electrode precursor;
sequentially overlapping and arranging a plurality of back contact solar cell sheets so that two adjacent back contact solar cell sheets have an overlapping region, the through hole of the back contact solar cell sheet positioned below is positioned in the overlapping region, and the width of the overlapping region is 0.1-3 mm;
filling electrode slurry into the through holes of the overlapped back contact solar cell pieces, and drying the electrode slurry to form a perforated electrode precursor; one end of the perforated electrode precursor is connected with one of the anode precursor and the cathode precursor of one back-contact solar cell, and the other end of the perforated electrode precursor is connected with the other of the anode precursor and the cathode precursor of the adjacent back-contact solar cell;
sintering and molding the positive electrode precursor, the negative electrode precursor and the perforated electrode precursor together to obtain a positive electrode, a negative electrode and a perforated electrode;
each positive electrode is orthogonal to one through hole; alternatively, each of the negative electrodes has one of the through holes orthogonal thereto.
2. The method of manufacturing a back contact laminated solar cell string according to claim 1, wherein the through-hole is located at an end of the positive electrode precursor or an end of the negative electrode precursor.
3. The method of claim 1, wherein the back contact solar cell is a monolithic cell or a sub-solar cell obtained by cutting the monolithic cell in equal parts.
4. The method of manufacturing a string of back contact laminated solar cells according to claim 1, wherein the through-holes have a circular, square or oval shape.
5. The method of manufacturing a string of back contact laminated solar cells according to claim 1, further comprising,
and texturing, diffusing, doping, polishing, depositing a passivation film and opening holes on the silicon wafer to obtain the back contact solar cell.
6. The method of manufacturing a back-contact laminated solar cell string according to claim 1, further comprising, before sintering and molding the positive electrode precursor, the negative electrode precursor, and the through-hole electrode precursor together,
and coating an inorganic adhesive between the through holes or around the through holes, wherein the inorganic adhesive is positioned in the overlapping area, and the inorganic adhesive is positioned between two adjacent back contact solar cell pieces.
7. The method of claim 1, wherein the through-holes are formed by laser drilling.
8. A string of back-contact laminated solar cells obtained by the method for manufacturing a string of back-contact laminated solar cells according to any one of claims 1 to 7.
9. A back contact laminated solar cell module comprising a plurality of strings of back contact laminated solar cells of claim 8 electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465318.XA CN110323300B (en) | 2019-05-30 | 2019-05-30 | Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465318.XA CN110323300B (en) | 2019-05-30 | 2019-05-30 | Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110323300A CN110323300A (en) | 2019-10-11 |
| CN110323300B true CN110323300B (en) | 2022-03-08 |
Family
ID=68119202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910465318.XA Active CN110323300B (en) | 2019-05-30 | 2019-05-30 | Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110323300B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466965B (en) | 2020-11-19 | 2022-06-03 | 晶科绿能(上海)管理有限公司 | Back contact solar cell piece with extension electrode and solar cell module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014067999A (en) * | 2012-09-04 | 2014-04-17 | Toyo Aluminium Kk | Ribbon line for solar cell and solar cell module using the same |
| CN106298987A (en) * | 2016-09-30 | 2017-01-04 | 晶澳（扬州）太阳能科技有限公司 | A kind of MWT solar module |
| CN108922929A (en) * | 2018-08-03 | 2018-11-30 | 浙江爱旭太阳能科技有限公司 | The two-sided imbrication solar cell module of perforation and preparation method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9780253B2 (en) * | 2014-05-27 | 2017-10-03 | Sunpower Corporation | Shingled solar cell module |
| CN104282788B (en) * | 2014-09-28 | 2017-03-22 | 苏州中来光伏新材股份有限公司 | Main-grid-free high-efficiency back contact solar cell module, main-grid-free high-efficiency back contact solar cell assembly and manufacturing technology of main-grid-free high-efficiency back contact solar cell assembly |
-
2019
- 2019-05-30 CN CN201910465318.XA patent/CN110323300B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014067999A (en) * | 2012-09-04 | 2014-04-17 | Toyo Aluminium Kk | Ribbon line for solar cell and solar cell module using the same |
| CN106298987A (en) * | 2016-09-30 | 2017-01-04 | 晶澳（扬州）太阳能科技有限公司 | A kind of MWT solar module |
| CN108922929A (en) * | 2018-08-03 | 2018-11-30 | 浙江爱旭太阳能科技有限公司 | The two-sided imbrication solar cell module of perforation and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110323300A (en) | 2019-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10230011B2 (en) | Shingled array solar cells and method of manufacturing solar modules including the same | |
| JP6495649B2 (en) | Solar cell element and solar cell module | |
| CN110212048A (en) | Back contacts lamination solar battery string and back contacts lamination solar module | |
| CN111477702A (en) | Back contact solar cell module and preparation method thereof | |
| CN110246911A (en) | Back contacts lamination solar battery string and manufacturing method, lamination solar module | |
| KR20200101832A (en) | Method of manufacturing shingled array solar cells and solar modules without bus bars | |
| CN209981250U (en) | Back contact laminated solar cell string and laminated solar cell assembly | |
| CN108922934B (en) | Double-sided direct-connection solar cell module and preparation method thereof | |
| CN110323300B (en) | Back contact laminated solar cell string, manufacturing method thereof and laminated solar cell assembly | |
| JP4185332B2 (en) | Solar cell and solar cell module using the same | |
| CN112289874A (en) | Solar cell electrode and preparation method thereof | |
| CN109037364B (en) | Double-sided direct-connection solar cell module with segmented through holes and preparation method | |
| CN109950334B (en) | MWT solar battery string, preparation method thereof and assembly | |
| CN110190145A (en) | Back contacts lamination solar battery string and manufacturing method, lamination solar module | |
| CN111448672A (en) | Solar cell with junctions retracted from cut edges | |
| CN210120147U (en) | Back contact laminated solar cell string and back contact laminated solar cell assembly | |
| CN111200037A (en) | Connection mode of photovoltaic cell in crystalline silicon photovoltaic cell assembly | |
| CN112466965B (en) | Back contact solar cell piece with extension electrode and solar cell module | |
| CN108987515A (en) | The direct-connected solar cell module of fragment perforation single side and preparation method | |
| JP7330880B2 (en) | SOLAR BATTERY STRING MANUFACTURING METHOD AND SOLAR BATTERY STRING | |
| JP4144241B2 (en) | Solar cell | |
| CN214378472U (en) | Single crystalline silicon solar cell for increasing output voltage | |
| CN109216475A (en) | A kind of solar cell panel assembly | |
| Weeber et al. | How to achieve 17% cell efficiencies on large back-contacted mc-Si solar cells | |
| CN112885915A (en) | Single crystalline silicon solar cell for increasing output voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |