CN113161438A - Photovoltaic laminated tile assembly with wave-shaped path lamination and preparation method thereof - Google Patents
Photovoltaic laminated tile assembly with wave-shaped path lamination and preparation method thereof Download PDFInfo
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- CN113161438A CN113161438A CN202110458076.9A CN202110458076A CN113161438A CN 113161438 A CN113161438 A CN 113161438A CN 202110458076 A CN202110458076 A CN 202110458076A CN 113161438 A CN113161438 A CN 113161438A
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- 238000003475 lamination Methods 0.000 title claims abstract description 9
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 38
- 239000010703 silicon Substances 0.000 claims abstract description 38
- 238000005520 cutting process Methods 0.000 claims description 34
- 210000001624 hip Anatomy 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 235000012431 wafers Nutrition 0.000 abstract description 36
- 238000010248 power generation Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002210 silicon-based material 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
- H01L31/04—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
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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
- H01L31/04—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
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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
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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
Abstract
The invention relates to a photovoltaic laminated assembly of a wave-shaped path lamination and a preparation method thereof, wherein the photovoltaic laminated assembly comprises at least one battery string; the battery string comprises a plurality of isosceles trapezoid battery pieces which are connected in series in a shingled mode along a wave path; when there are a plurality of battery strings, the plurality of battery strings are coupled in series and/or in parallel. The invention can effectively reduce the loss of the silicon wafers and increase the effective power generation area of each silicon wafer.
Description
Technical Field
The invention relates to a photovoltaic laminated assembly, in particular to a photovoltaic laminated assembly of a wave-shaped path laminated sheet and a preparation method thereof.
Background
The shingle assembly structure can realize seamless connection between the battery units, and the light-facing surfaces of the battery units can adopt a design without a main grid, so that the cost can be reduced and the shingle assembly structure has a unique visual effect compared with the traditional photovoltaic assembly. While the structural design of the stack assembly currently on the market comprises a structural design with transverse and vertical arrangement of the battery cells, reference may be made to patents EP3149775B1 and US10580917B2, respectively. The shape of the battery sheet, which is the basic unit of the conventional shingle assembly structure, tends to be rectangular. As a rectangular battery piece or a battery strip, a silicon wafer is often obtained by cutting according to an inscribed square of a silicon wafer, a battery piece with a power generation function is prepared by using the square silicon wafer as a substrate, and then the battery piece is laser-cut into a plurality of rectangular battery strips. In either case, the power generation area of the silicon wafer is the area of the inscribed square. In order to reduce the cost and improve the power generation efficiency, it is a considerable research direction to increase the power generation area of the silicon wafer cell.
Disclosure of Invention
A first object of the present invention is to provide a photovoltaic shingle assembly of undulating path laminations which is effective in reducing the loss of silicon wafers and increasing the effective power generation area per silicon wafer.
The technical scheme for realizing the first purpose of the invention is as follows: the photovoltaic laminated tile assembly of the wave-shaped path laminated sheet comprises at least one cell string; the battery string comprises a plurality of isosceles trapezoid battery pieces which are connected in series in a shingled mode along a wave path; when there are a plurality of battery strings, the plurality of battery strings are coupled in series and/or in parallel.
The wave path comprises a plurality of wave unit paths which are arranged in a straight line; the wave unit path comprises a lower arc path and an upper arc path which are naturally connected; the central angle theta 1 of the lower arc path is equal to the central angle theta 2 of the upper arc path; x isosceles trapezoid battery pieces are arranged on the lower arc path, and x is more than or equal to 2; x isosceles trapezoid battery pieces are also arranged on the upper arc path; the included angle alpha between the two side waists of the isosceles trapezoid battery piece is theta 1/x; the front surface of the waist of the upper isosceles trapezoid battery piece on the lower arc path is connected with the back surface of the waist of the lower isosceles trapezoid battery piece in series through conductive adhesive; the front surface of the waist of the upper isosceles trapezoid battery piece on the upper arc path is connected with the back surface of the waist of the lower isosceles trapezoid battery piece in series through conductive adhesive; the upper bottom edge of the isosceles trapezoid battery piece on the lower arc path is positioned on the inner side of the arc of the lower arc path; the upper bottom edge of the isosceles trapezoid battery piece on the upper arc path is positioned on the inner side of the arc of the upper arc path.
The central angle theta 1 of the lower circular arc path and the central angle theta 2 of the upper circular arc path are both 60 deg..
And x is an integer of 2 or more. Preferably 2 or 3 or 4.
A second object of the present invention is to provide a method for manufacturing a photovoltaic shingle assembly of the above-described undulating path laminate, which method is effective in reducing material loss from silicon wafers.
The technical scheme for realizing the second purpose of the invention is as follows: the preparation method of the photovoltaic laminated tile assembly for preparing the wavy path laminated sheet comprises the following steps:
s1, making a cutting layout of the battery unit prepared by cutting the silicon wafer, wherein the cutting layout comprises an outer polygon, an inner polygon and a plurality of radial cutting lines; the number of the sides of the outer polygon is equal to the number of the sides of the inner polygon; the sides of the outer polygon correspond to the lower bottom edges of the isosceles trapezoid battery pieces and are equal in length, and the sides of the inner polygon correspond to the upper bottom edges of the isosceles trapezoid battery pieces and are equal in length; the radial cutting lines extend outwards from the center of a silicon wafer in the radial direction, the number n of the radial cutting lines is obtained through the following calculation formula, and n is an integer:
wherein, every radial cutting line corresponds the waist of a isosceles trapezoid battery piece of passing through.
S2, cutting according to the cutting layout to obtain battery cells;
s3, obtaining a semi-finished product of the battery piece after the battery unit is subjected to texturing, diffusion, etching and passivation;
s4, respectively printing a front electrode and a back electrode on the front surface and the back surface of the semi-finished product of the battery piece to obtain an isosceles trapezoid battery piece;
s5, connecting the isosceles trapezoid battery pieces in series in a tile-overlapping manner according to the arrangement mode of the isosceles trapezoid battery pieces along the wave path to obtain a battery string;
s6, selecting one battery string or a plurality of battery strings as required to form a photovoltaic laminated assembly with a wave-shaped path lamination; when there are a plurality of battery strings, the plurality of battery strings are connected in parallel and/or in series.
Alternative to the process steps S1-S4: the method comprises the steps of preparing a cell with a silicon wafer as a substrate and a power generation function, and carrying out laser cutting on the cell to obtain an isosceles trapezoid cell so as to reduce the process preparation cost.
The outer polygon is an inscribed regular polygon of the excircle of the silicon wafer, and the radius of the excircle of the silicon wafer is R; the inner polygon is an inscribed regular polygon of a circle with the radius r; the radius R is smaller than R/2.
The invention has the positive effects that: (1) the cell string is composed of a plurality of isosceles trapezoid cells connected in series in a shingle mode along a wave path, so that the visual effect of the photovoltaic shingle assembly can be improved, the loss of silicon wafers can be effectively reduced when the isosceles trapezoid cells are manufactured, and the effective power generation area of each silicon wafer is increased.
(2) According to the invention, the relation among the central angle theta 1 of the lower arc path, the central angle theta 2 of the upper arc path and the number x of the isosceles trapezoid-shaped battery pieces can obtain a more attractive battery string, and the cutting scheme of the silicon wafer can be improved to the maximum extent.
(3) The outer polygon is an inscribed regular polygon of the excircle of the silicon wafer, wherein the radius of the excircle of the silicon wafer is R; the inner polygon is an inscribed regular polygon of a circle with the radius R, and the radius R is smaller than R/2, so that the power generation area of the isosceles trapezoid battery piece can be further increased.
(4) The preparation method of the photovoltaic laminated tile assembly with the wavy path lamination can quickly obtain a cutting scheme according to the actual product size, and forms an industrial general method.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic structural view of a photovoltaic shingle assembly of the present invention having a wave-shaped path lamination;
FIG. 2 is a schematic diagram of a battery string according to the present invention;
FIG. 3 is a schematic diagram showing an arrangement of isosceles trapezoidal cells along a wave unit path according to the present invention;
FIG. 4 is a cut view of a silicon wafer of the present invention;
FIG. 5 is a diagram showing the correspondence between the arrangement of isosceles trapezoidal cells and the dicing pattern of a silicon wafer in the present invention;
fig. 6 is a schematic diagram illustrating an arrangement of isosceles trapezoid battery cells on a wave unit path in embodiment 2 of the present invention;
fig. 7 is a schematic diagram of an arrangement of isosceles trapezoid battery cells on a wave unit path in embodiment 3 of the present invention.
Detailed Description
(example 1)
Referring to fig. 1 to 3, the wave-shaped path laminated photovoltaic shingle assembly of the present invention includes a plurality of cell strings 1 connected in parallel; the cell string 1 comprises a plurality of isosceles trapezoid-shaped cell pieces 11 coupled in series in a shingled manner along the wave path 2.
The wave path 2 comprises a plurality of linearly arranged wave unit paths 21; the wave unit path 21 comprises a naturally-joined lower arc path 211 and an upper arc path 212; the central angle θ 1 of the lower circular arc path 211 is equal to the central angle θ 2 of the upper circular arc path, and θ 1 ═ θ 2 ═ 60 °; 2 isosceles trapezoid battery pieces 11 are arranged on the lower arc path 211; 2 isosceles trapezoid battery pieces 11 are also arranged on the upper arc path 212; the included angle α between the two side waists of the isosceles trapezoid battery piece 11 is θ 1 ÷ 2 ═ 30 °; the front surface of the waist of the previous isosceles trapezoid battery piece 11 on the lower arc path 211 is connected in series with the back surface of the waist of the next isosceles trapezoid battery piece 11 through a conductive adhesive; the front surface of the waist of the previous isosceles trapezoid battery piece 11 on the upper arc path 212 is connected in series with the back surface of the waist of the next isosceles trapezoid battery piece 11 through a conductive adhesive; the upper bottom edge of the isosceles trapezoid battery piece 11 on the lower arc path 211 is positioned on the inner side of the arc of the lower arc path 211; the upper bottom edge of the isosceles trapezoid battery piece 11 on the upper arc path 212 is located inside the arc of the upper arc path 212.
Referring to fig. 4 and 5, the method for manufacturing the above-mentioned photovoltaic shingle assembly of the wave-shaped path laminate according to the present invention comprises the following steps:
s1, preparing a cutting layout of the battery unit 31 on the silicon wafer 3, wherein the cutting layout comprises an outer polygon 4, an inner polygon 5 and a plurality of radial cutting lines 6; the number of sides of the outer polygon 4 is equal to the number of sides of the inner polygon 5; the side of the outer polygon 4 corresponds to the lower bottom edge of the isosceles trapezoid battery piece 11 and is equal in length, and the side of the inner polygon 5 corresponds to the upper bottom edge of the isosceles trapezoid battery piece 11 and is equal in length; the outer polygon 4 is an inscribed regular polygon of the excircle of the silicon wafer 3, and the radius of the excircle of the silicon wafer 3 is R; the inner polygon 5 is an inscribed regular polygon of a circle with the radius r; the radius R is less than R/2; the radial cutting lines 6 extend radially outwards from the center of the silicon wafer 3, the number n of the radial cutting lines 6 is 12, and each radial cutting line 6 correspondingly passes through the waist of one isosceles trapezoid battery piece 11.
S2, cutting according to the cutting layout to obtain the battery cell 31;
s3, obtaining a semi-finished product of the battery piece after the battery unit 31 is subjected to texturing, diffusion, etching and passivation;
s4, respectively printing a front electrode and a back electrode on the front surface and the back surface of the semi-finished product of the battery piece to obtain an isosceles trapezoid battery piece 11;
s5, connecting the isosceles trapezoid battery pieces 11 in series in a tile-overlapping manner according to the arrangement mode of the isosceles trapezoid battery pieces along the wave path 2 to obtain a battery string 1;
and S6, connecting a plurality of cell strings 1 in parallel to form the photovoltaic laminated tile assembly of the wave-shaped path laminated sheet.
It is considered that the above preparation method can effectively improve the utilization rate of silicon wafers, and can be understood by the following explanation:
suppose that: and cutting an inscribed regular n-polygon of one silicon wafer, wherein the power generation area of all the battery units after cutting is as follows:
the common square monocrystalline silicon wafer in the current market is an inscribed square of a silicon wafer, and the power generation area of a battery unit of the square monocrystalline silicon wafer is calculated according to the following formula:
A2＝2R2
in general, in order to increase the power generation area of a battery cell cut by a silicon wafer inscribed regular n-polygon, the radius r is usually less than 1/2, a 1: the numerical ratio of A2 is calculated by the formula
The numerical calculation adopted in the technical scheme is shown in table 1, a 1: the numerical ratio of A2 is greater than 1, which shows that the effective power generation area of the cell unit can be increased by the cutting mode of the silicon wafer cell in the technical scheme, and the purpose of saving crystalline silicon materials is achieved.
The following table shows the numerical ratio of the area of the battery unit cut from the silicon wafer in the present embodiment to the area of the battery unit cut from the square silicon wafer of the conventional silicon wafer.
(example 2)
In the invention, 3 isosceles trapezoid battery pieces 11 are arranged on the lower arc path; 2 isosceles trapezoid battery pieces 11 are also arranged on the upper arc path 211; the angle α between the two side waists of the isosceles trapezoid battery piece 11 is θ 1 ÷ 2 ═ 20 °. The number n of radial cutting lines 6 is 18.
Other technical features are the same as those of embodiment 1.
(example 2)
In the invention, 4 isosceles trapezoid battery pieces 11 are arranged on the lower arc path; 2 isosceles trapezoid battery pieces 11 are also arranged on the upper arc path 211; the angle α between the two side waists of the isosceles trapezoid battery piece 11 is θ 1 ÷ 2 ═ 15 °. The number n of radial cutting lines 6 is 24.
Other technical features are the same as those of embodiment 1.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A photovoltaic shingle assembly of wave path laminations characterized in that: comprises at least one battery string; the battery string comprises a plurality of isosceles trapezoid battery pieces which are connected in series in a shingled mode along a wave path; when there are a plurality of battery strings, the plurality of battery strings are coupled in series and/or in parallel.
2. The waved path laminated photovoltaic shingle assembly according to claim 1, wherein: the wave path comprises a plurality of linearly arranged wave unit paths; the wave unit path comprises a lower arc path and an upper arc path which are naturally connected; the central angle theta 1 of the lower arc path is equal to the central angle theta 2 of the upper arc path; x isosceles trapezoid battery pieces are arranged on the lower arc path, and x is more than or equal to 2; x isosceles trapezoid battery pieces are also arranged on the upper arc path; the included angle alpha between the two side waists of the isosceles trapezoid battery piece is theta 1/x; the front surface of the waist of the upper isosceles trapezoid battery piece on the lower arc path is connected with the back surface of the waist of the lower isosceles trapezoid battery piece in series through conductive adhesive; the front surface of the waist of the upper isosceles trapezoid battery piece on the upper arc path is connected with the back surface of the waist of the lower isosceles trapezoid battery piece in series through conductive adhesive; the upper bottom edge of the isosceles trapezoid battery piece on the lower arc path is positioned on the inner side of the arc of the lower arc path; the upper bottom edge of the isosceles trapezoid battery piece on the upper arc path is positioned on the inner side of the arc of the upper arc path.
3. The waved path laminated photovoltaic shingle assembly according to claim 2, wherein: the central angle theta 1 of the lower circular arc path and the central angle theta 2 of the upper circular arc path are both 60 deg..
4. A wave path laminated photovoltaic shingle assembly according to claim 3 wherein: and x is an integer greater than or equal to 2.
5. A method of making a photovoltaic shingle assembly of the waved path laminate of claim 2, comprising the steps of:
s1, making a cutting layout for cutting the prepared battery cells on the silicon wafer, wherein the cutting layout comprises an outer polygon, an inner polygon and a plurality of radial cutting lines; the number of the sides of the outer polygon is equal to the number of the sides of the inner polygon; the sides of the outer polygon correspond to the lower bottom edges of the isosceles trapezoid battery pieces and are equal in length, and the sides of the inner polygon correspond to the upper bottom edges of the isosceles trapezoid battery pieces and are equal in length; the radial cutting lines extend outwards from the circle center of the silicon wafer in the radial direction, the number n of the radial cutting lines is obtained through the following calculation formula, and n is an integer:
wherein, every radial cutting line corresponds the waist of a isosceles trapezoid battery piece of passing through.
S2, cutting according to the cutting layout to obtain battery cells;
s3, obtaining a semi-finished product of the battery piece after the battery unit is subjected to texturing, diffusion, etching and passivation;
s4, respectively printing a front electrode and a back electrode on the front surface and the back surface of the semi-finished product of the battery piece to obtain an isosceles trapezoid battery piece;
s5, carrying out serial connection in a shingled mode according to the arrangement mode of the middle waist trapezoid battery pieces along the wave path in claim 2 to obtain a battery string;
s6, selecting one battery string or a plurality of battery strings as required to form a photovoltaic laminated assembly with a wave-shaped path lamination; when there are a plurality of battery strings, the plurality of battery strings are connected in parallel and/or in series.
6. The method of claim 5, wherein: the outer polygon is an inscribed regular polygon of the excircle of the silicon wafer, and the radius of the excircle of the silicon wafer is R; the inner polygon is an inscribed regular polygon of a circle with the radius r; the radius R is smaller than R/2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113972289A (en) * | 2021-10-22 | 2022-01-25 | 西安交通大学 | Slicing method of regular polygon solar cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113972289A (en) * | 2021-10-22 | 2022-01-25 | 西安交通大学 | Slicing method of regular polygon solar cell |
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