WO2020177530A1 - Ensemble photovoltaïque et son procédé de fabrication - Google Patents

Ensemble photovoltaïque et son procédé de fabrication Download PDF

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Publication number
WO2020177530A1
WO2020177530A1 PCT/CN2020/075813 CN2020075813W WO2020177530A1 WO 2020177530 A1 WO2020177530 A1 WO 2020177530A1 CN 2020075813 W CN2020075813 W CN 2020075813W WO 2020177530 A1 WO2020177530 A1 WO 2020177530A1
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WIPO (PCT)
Prior art keywords
solar cell
buffer layer
photovoltaic module
adjacent
edge
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PCT/CN2020/075813
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English (en)
Chinese (zh)
Inventor
潘秀娟
黄甫阳
董经兵
刘亚锋
邢国强
Original Assignee
苏州阿特斯阳光电力科技有限公司
常熟阿特斯阳光电力科技有限公司
阿特斯阳光电力集团有限公司
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Priority claimed from CN201910171480.0A external-priority patent/CN109786492B/zh
Priority claimed from CN201910616091.4A external-priority patent/CN112216752A/zh
Application filed by 苏州阿特斯阳光电力科技有限公司, 常熟阿特斯阳光电力科技有限公司, 阿特斯阳光电力集团有限公司 filed Critical 苏州阿特斯阳光电力科技有限公司
Publication of WO2020177530A1 publication Critical patent/WO2020177530A1/fr

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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
    • H01L31/043—Mechanically stacked PV 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
    • H01L31/04—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
    • H01L31/048—Encapsulation of modules
    • 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
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • 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
    • 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
    • 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
    • H01L31/0216—Coatings
    • 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
    • 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

Definitions

  • the invention relates to the field of solar energy, in particular to a photovoltaic module and a manufacturing method thereof.
  • the battery strings of traditional photovoltaic modules are electrically connected to adjacent cells through solder ribbons, and the solder ribbons connect the bus electrodes on the front of one cell and the bus electrodes on the back of the other adjacent cell.
  • the area between adjacent cells in the above-mentioned photovoltaic module is not fully utilized, which will increase the material and manufacturing cost of the photovoltaic module.
  • the shingled module introduced in the industry cancels the gap between adjacent cells, and realizes the electrical connection of adjacent cells through conductive glue, without the need to set solder ribbons, but it also faces problems such as high cost of conductive glue materials and difficult rework. .
  • the purpose of the present invention is to provide a photovoltaic module and a manufacturing method thereof, which can reduce the edge stress of the solar cell, reduce the abnormal cracking, and improve the quality of the photovoltaic module.
  • the present invention provides a photovoltaic module including a plurality of battery strings, and the battery strings include:
  • the solar cells including electrodes arranged on the surface of the cells;
  • Welding tape is used to connect two adjacent solar cells to connect the above-mentioned solar cells in series;
  • the buffer layer is arranged on the edge of the solar cell that crosses the welding ribbon and between the welding ribbon and the surface of the battery facing the welding ribbon.
  • the edges of two adjacent solar cells overlap each other to form an overlap space between the two adjacent solar cells, and the buffer layer is located in the overlap space.
  • the buffer layer includes a first buffer layer provided on the front of the solar cell and a second buffer layer provided on the back of the solar cell, and the first buffer layer and the second buffer layer are located at different locations. Side edge.
  • the buffer layer is elongated and extends along the edge, or the buffer layer includes n buffer disks arranged at intervals and corresponding to the position of the solder ribbon, and n is the surface of the solar cell on one side The number of ribbons to be set.
  • the solar cell is provided with the buffer layer at the edge of one side surface, and the edge is used for overlapping.
  • the size of the buffer layer in the extending direction of the welding ribbon is greater than or equal to the size of the overlapping space in the extending direction of the welding ribbon; preferably, the thickness of the buffer layer is 200-400um.
  • the buffer layer includes ethylene-vinyl acetate copolymer EVA and/or polyolefin elastomer POE.
  • the welding tape includes a first section welded to the front electrode of the solar cell, a second section welded to the back electrode of another adjacent solar cell, and connecting the first section and the second section.
  • the transition section, the transition section is arranged in the overlapping space, the width of the transition section is greater than the width of the first section and/or the second section; preferably, the first section and The second section overlaps outside the overlapping space.
  • the electrode includes a plurality of bus bars extending along the arrangement direction of the plurality of batteries, the solder ribbon is welded to the bus bar, and the buffer layer and the bus bar are longitudinally There is a gap between the ends in the longitudinal direction.
  • the present invention also provides a method for manufacturing a photovoltaic module, including: obtaining a first solar cell, one side surface of the first solar cell is provided with n electrodes extending in a first direction, and A solar cell has an adjacent edge perpendicular to the first direction;
  • the buffer layer is placed on the adjacent edge of the first solar cell surface.
  • the buffer layer is placed on the adjacent edge of the surface of the first solar cell before connecting one end of the n welding ribbons to the electrodes on one side surface of the first solar cell.
  • the method After placing the buffer layer on the adjacent edge of the surface of the first solar cell, and before connecting the other ends of the n solder ribbons to the electrodes on one side of the second solar cell, the method It also includes: pre-fixing the buffer layer to the adjacent edge.
  • the pre-fixing the buffer layer to the adjacent edge includes: heating the buffer layer to make the buffer layer adhere to the adjacent edge.
  • the strip-shaped buffer layer includes:
  • placing the buffer layer on the adjacent edge of the surface of the first solar cell includes:
  • the cut buffer layer is transferred along a second direction and placed on an adjacent edge of the surface of the first solar cell, wherein the second direction is perpendicular to the first direction.
  • placing the buffer layer on the adjacent edge of the surface of the first solar cell includes:
  • the present invention also provides a method for manufacturing a photovoltaic module, including:
  • the surface of one side of the solar cell is provided with n electrodes extending in the first direction;
  • At least one dividing line is formed on the surface of one side of the solar cell to divide the solar cell into a plurality of battery strip regions, and the extending direction of the dividing line is perpendicular to the first direction;
  • a buffer layer is respectively arranged on one side surface of each battery strip area, and the buffer layer is arranged along the long side of the battery strip area;
  • the beneficial effect of the present invention is that the photovoltaic module of the present invention is provided with a buffer layer on the surface of the solar cell, and the buffer layer can be used to relieve the hard contact between the solar cell and the solder ribbon, thereby reducing the split rate of the photovoltaic module .
  • Fig. 1 is a schematic diagram of the overlapping state of two adjacent solar cells in a laminated photovoltaic module provided by the present invention.
  • FIG. 2 is a schematic diagram of the structure of the soldering ribbon connecting two adjacent solar cells provided by the present invention.
  • Fig. 3 is a top view of a solar cell before division in an embodiment of the present invention.
  • Fig. 4 is a top view of a solar cell before division in an embodiment of the present invention.
  • Fig. 5 is a top view of the solar cell before division in an embodiment of the present invention.
  • Fig. 6 is a top view of a solar cell before division in an embodiment of the present invention.
  • FIG. 7 is a schematic cross-sectional view of the overlapping state of solar cells in an embodiment of the present invention.
  • Fig. 8 is a schematic cross-sectional view of the overlapping state of solar cells in an embodiment of the present invention (taken along the cutting line).
  • Fig. 9 is a schematic diagram of the connection state of two adjacent solar cells in the conventional photovoltaic module provided by the present invention.
  • FIG. 10 is a schematic diagram of the main flow of a method for manufacturing a photovoltaic module according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of the main flow of a method for manufacturing a photovoltaic module according to another embodiment of the application.
  • first and second do not represent any sequence relationship, and are only for the convenience of description.
  • the terms “include”, “include”, or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. Elements, or also include elements inherent to such processes, methods, articles, or equipment. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
  • the manufacture of photovoltaic modules usually includes the steps of cell string preparation, lamination, installation of junction boxes, and testing.
  • the photovoltaic module manufacturing method provided in the embodiments of the present application aims to optimize the design of the cell string preparation steps and reduce the cell string In the edge stress of adjacent solar cells, the phenomenon of cracking is reduced.
  • the laminated photovoltaic module includes a plurality of battery strings arranged in a straight line, and each battery string includes a plurality of solar cells 1 arranged in an overlapping state, and is used to connect the solar cells 1 into a string (such as series).
  • the solar cell 1 has a surface 10 printed with a bus bar 11 (ie, an electrode) and a thin grid line (not shown) connected to the bus bar 11. Further, in order to increase the effective area of the solar cell 1 in the laminated photovoltaic module and improve the power and photovoltaic module efficiency, the edges of two adjacent solar cells 1 overlap to form an overlapping space (not labeled).
  • n solder ribbons 2 Two adjacent solar cells 1 are connected in series by n solder ribbons 2, where n is the number of bus bars 11 provided on one side surface 10 of the solar cell 1, that is, in the present invention, the solder ribbons 2 and the bus bars 11 One-to-one correspondence settings.
  • the welding ribbon 2 includes a first section 21 welded to the front busbar line 11 of one of the two solar cells 1 adjacent to the battery string, and another adjacent solar cell
  • the second section 22 connected to the bus bar 11 on the back of the battery 1 and the transition section 23 connecting the first section 21 and the second section 22.
  • the first section 21 can be a round wire welding ribbon or a polygonal welding ribbon to reduce the shading of the front side (that is, the light-receiving surface) of the solar cell 1;
  • the second section 22 can be a flat welding ribbon , To match the wider main grid line on the back of the solar cell 1 to reduce resistance and increase power.
  • the above-mentioned first section 21 and the second section 22 can be two independent sections of welding tape.
  • the first section 21 is welded to the front of a solar cell 1
  • the second section 22 is welded to the back of another solar cell 1
  • the ends of the first section 21 and the second section 22 are connected, and in actual production
  • the first section 21 and the second section 22 are usually overlapped outside the overlapping space.
  • the transition section 23 is arranged in the overlapping space, and the width of the transition section 23 may be greater than that of the first section 21 and/or the second section 22
  • the width of the transition section 23 is approximately flat, so as to increase the contact area between the transition section 23 and the contacting object in the overlapping space, and further reduce the possibility of the solar cell 1 breaking at the position of the laminate;
  • the flat transition section 23 can be obtained by flattening the conventional welding ribbon in a certain direction.
  • solder tape 2 in the present invention includes but is not limited to tin-plated copper tape or tin-coated copper tape, and the shape of the solder tape 2 in the foregoing embodiment is only exemplary and should not be limited thereto.
  • the “front side” mentioned here refers to the side of the solar cell 1 placed upward
  • the “back side” refers to the side opposite to the aforementioned front side and placed downward.
  • the front surface is usually a surface that directly receives solar radiation, that is, the light-receiving surface of a traditional solar cell.
  • the bus electrodes on the side surface are mostly continuously arranged and have a small width. It should be noted that the above-mentioned “front side” is not a limitation on the description of the direction of the positive and negative electrodes of the solar cell 1.
  • the buffer layer 3 is arranged at the edge where the solar cell 1 and the solder ribbon 2 intersect, and is located in the overlapping space. Specifically, the buffer layer 3 is located between the solder ribbon 2 and the surface 10 of the solar cell 1 facing the solder ribbon 2. This arrangement can effectively avoid the direct contact between the solar cell 1 and the solder ribbon 2 and solve the problem. In some photovoltaic modules, there is a problem of hard contact between the cell edge 1 and the solder ribbon 2.
  • the solar cell 1 can be a solar cell sheet of conventional size (approximately square), or a cell unit obtained by dividing a solar cell sheet of a conventional size;
  • the solar cell 1 is a solar cell sheet of conventional size.
  • the solar cell 1 in the present invention includes but is not limited to a crystalline silicon cell or a thin film cell.
  • the solar cell 1 has a first edge 13 and a second edge 14 that are opposite and parallel. Taking all three as an example (as shown in Figs. 3 to 5), the solar cell 1 can be divided into Three parallel buffer layers 3 are arranged on the top, and the number of buffer layers 3 is the same as the number of battery strips divided by a single solar cell 1.
  • the surface 10 of the solar cell 1 is provided with a first strip-shaped buffer layer 3a adjacent to the first edge 13 and a second strip-shaped buffer layer 3b adjacent to the second edge 14, and the cutting line 12 Located between the first strip-shaped buffer layer 3a and the second strip-shaped buffer layer 3b, adjacent cutting lines are also provided between the first strip-shaped buffer layer 3a and the second strip-shaped buffer layer 3b 12 set the middle strip buffer layer 3c.
  • This arrangement can reduce the specific gravity of overlapping two cut edges, and increase the specific gravity of overlapping a non-cut edge and a cut edge as much as possible, thereby improving the overall fragmentation rate of the assembly.
  • the buffer layer 3 is elongated and extends along the side of the solar cell 1.
  • the buffer layer 3 adopts the discontinuous A buffer layer design, wherein a plurality of rows of discontinuous buffer layers perpendicular to the main grid lines are formed on the surface 10, and each column of the buffer layer may include n buffer disks 12d arranged at intervals and corresponding to the position of the solder ribbon 2.
  • the size of 12d in the width direction of the main grid line may be greater than or equal to the width of the solder ribbon 2 to avoid direct contact between the transition section located in the overlapping space and the surface 10.
  • the buffer layer 3 is located on the surface of the solder ribbon 2 and the solar cells 1a, 1b with electrodes.
  • the buffer layer 3 may include a first buffer layer 3'provided on the front of the solar cell 1 and a second buffer layer 3" provided on the back of the solar cell 1, and the first buffer layer 3" A buffer layer 3'and the second buffer layer 3" are located on different side edges (as shown in FIG. 8).
  • the buffer layer 3 can be provided only on the edge of one side surface of the solar cell 1 (as shown in FIG. 7).
  • the buffer layer 3 is arranged in a single row and may include a plurality of buffer portions arranged at intervals and filled between two adjacent solder ribbons 2 12e.
  • the size of the buffer portion 12e in the thickness direction of the solar cell 1 can be larger than the size of the transition section 24 in the thickness direction of the solar cell 1, so that a passage for the transition section 24 to pass is formed between two adjacent buffer portions 12e. , Thereby alleviating the hard contact between the transition section 24 and the surface of the solar cell 1.
  • FIG. 6 is a schematic diagram of obtaining two half-cell solar cells by cutting a solar cell 1 into two.
  • a layer of buffer material is applied to the laminated area of the solar cell 1 by screen printing, the width can be 0.8mm, and then the solvent is removed by baking at a low temperature of 80 ⁇ 100°C, leaving unpolymerized
  • the buffer material is about 300um.
  • the size of the buffer layer 3 in the extending direction of the welding ribbon 2 can be greater than or equal to the size of the overlapping space in the extending direction of the welding ribbon 2 to ensure that the welding ribbon 2 in the overlapping space is aligned.
  • the buffer layer 3 can be a transparent material so as not to block light.
  • the buffer layer 3 can be made of a material having a lower hardness than the welding tape 2, for example, ethylene-vinyl acetate copolymer EVA or polyolefin elastomer POE.
  • the process of forming the buffer layer 3 can be as follows: first, apply a layer of buffer material solvent on the surface of the battery by drip coating or spin coating, and then remove the solvent by baking to leave unpolymerized buffer material on the battery surface.
  • the buffer layer 3 is formed.
  • a solid buffer layer 3 can also be used and fixed at a specific position on the surface of the solar cell 1.
  • the thickness of the buffer layer 3 may be 200-400um, so as to take into account the buffer effect and material cost.
  • FIG. 9 it is a conventional photovoltaic module provided by the present invention.
  • a conventional photovoltaic module there is a certain gap or a gap close to zero between two adjacent solar cells 1; and in this module, the buffer layer 3 provided at the edge of the solar cell 1 is also applicable, which also solves the problem.
  • the present invention also provides a method for manufacturing photovoltaic modules.
  • the manufacturing method of the photovoltaic module includes the following steps:
  • One side surface 10 of the first solar cell 1' is provided with n electrodes (not numbered) extending in a first direction, and the first solar cell 1'has a direction perpendicular to the first direction. Adjacent edge
  • a second solar cell 1" is obtained, and one side surface 10 of the second solar cell 1'is provided with n electrodes extending in the first direction;
  • first solar cell 1'and the second solar cell 1" have the same structure as the aforementioned solar cell 1, that is, to facilitate the description of the connection method between the solar cells 1, in this embodiment
  • the solar cell 1 has been renamed and labeled, but it should not be limited to this.
  • the edge between two adjacent solar cells 1 and perpendicular to the first direction is the adjacent edge
  • the buffer layer 3 is placed on the adjacent edge of the front surface of the first solar cell 1'.
  • the buffer layer 3 is placed on the adjacent edge of the surface 10 of the first solar cell 1 ′ after connecting one end of the n solder ribbons 2 to the electrodes on one side surface 10 of the first solar cell 1 ′.
  • the welding ribbon 2 is first aligned and placed on the front surface of the first solar cell 1'.
  • the welding ribbon 2 extends in the first direction and beyond the first solar cell 1'.
  • the first section 21 of the welding ribbon 2 is The electrodes on the surface 10 of the first solar cell 1 ′ are electrically connected; and the buffer layer 3 is pressed on the welding ribbon 2 and is in contact with the transition section 23.
  • the abutting edge of the back of the second solar cell 1" is superimposed on the buffer layer 3.
  • the first solar cell 1'and the second solar cell 1" form a corresponding overlapping space along the abutting edges of the two ,
  • the transition section 23 is located in the overlapping space between the first solar cell 1'and the second solar cell 1".
  • the second section 22 of the welding ribbon 2 is electrically connected to the electrode on the back of the second solar cell 1" to complete the series connection of the first solar cell 1'and the second solar cell 1".
  • the buffer layer 3 undergoes its own deformation during the lamination process, and the formation between the adjacent solder ribbons 2 is consistent with the formation of the two adjacent solar cells 1 (ie, the first solar cell 1'and the second solar cell 1" )
  • the filling layer in contact with each other avoids hard contact between the solder ribbon 2 and the solar cells 1 on both sides and reduces the edge stress. Repeating the above method steps can produce the corresponding battery string. Compared with the prior art, only additional Place the buffer layer in 3 steps, which matches well with the existing manufacturing process, which is convenient for on-site process upgrade and implementation.
  • placing the buffer layer 3 on the adjacent edge of the surface of the first solar cell 1' specifically includes: cutting to obtain a strip-shaped buffer layer 3 of a predetermined size; and then transferring the cut buffer layer 3 to the second direction along the second direction.
  • a solar cell 1' it is placed on the adjacent edge of the front surface of the first solar cell 1'; wherein the second direction is perpendicular to the first direction.
  • the mechanism for transferring the buffer layer 3 moves along the direction perpendicular to the arrangement direction of the first solar cells 1 ′, so as to avoid interference effects on the alignment of the welding ribbon 2.
  • the buffer layer 3 is pulled along the arrangement direction perpendicular to the first solar cell 1', and cut to obtain a buffer layer 3 of a predetermined length , And placed on the adjacent edge of the front surface of the first solar cell 1'.
  • the width of the wound buffer layer 3 is the width required for manufacturing the aforementioned photovoltaic module.
  • the manufacturing method also includes using vacuum adsorption to fix the first solar cell 1'on a predetermined working platform, which not only ensures the relative position of the two solar cells 1 connected in series, but also avoids the welding ribbon 2 and the buffer layer. 3 An offset occurred during the movement.
  • the buffer layer 3 is then placed, which can provide better results for the solder ribbon 2 and the front of the solar cell 1.
  • the electrical connection of the solder ribbon 2 and the solar cell 1 can better maintain a relatively fixed position during the subsequent preparation process.
  • the feature that is different from the previous embodiment is that before connecting one end of the n solder ribbons to the electrodes on one side surface of the first solar cell 1', the buffer layer 3 It is placed on the adjacent edge of the surface of the first solar cell 1 ′, and the first section 21 is electrically connected with the electrode on the front surface of the first solar cell 1 ′, and the transition section 23 is in contact with the buffer layer 3.
  • the manufacturing method further includes stacking the edge of the back of another solar cell 1 on the edge of the front of the solar cell 1 to form the overlap space.
  • pre-fixing the buffer layer 3 to the adjacent edge includes: heating the buffer layer 3 to make the buffer layer adhere to the adjacent edge.
  • the pre-fixing process includes: heating the buffer layer 3 so that the buffer layer 3 is bonded to the front side of the solar cell 1 or the back side of another solar cell 1.
  • the buffer layer 3 can be It is pre-bonded with the transition section 23 of the welding ribbon 2 to improve the positional stability of the welding ribbon 2.
  • the buffer layer 3 and the solar cell 1 or another solar cell 1 can also be pre-fixed by gluing, that is, The surface of the buffer layer 3 and/or the surface of the solar cell 1, the surface of the buffer layer 3 and/or the surface of the other solar cell 1 is coated with a corresponding adhesive so that the buffer layer 3 is placed on the solar cell 1. After the edge of the front side or the edge of the back side of another solar cell 1, pre-fixation is realized.
  • the buffer layer 3 includes a first buffer layer 3'and a second buffer layer 3", and the manufacturing method includes sequentially combining the first buffer layer 3'and the solder ribbon 2 After placing on the front of the solar cell 1, place the second buffer layer 3" on the edge of the front of the solar cell 1 and cover the transition section 23; then, layer another solar cell 1 on the second buffer layer 3".
  • the first buffer layer 3'and the second buffer layer 3" can be pre-fixed on the front of the solar cell 1 and the back of the other solar cell 1, respectively.
  • the transition section 23 is located between the first buffer layer 3'and the second buffer layer 3" That is, the solder ribbon 2 is not in direct hard contact with the solar cell 1 and the other solar cell 1.
  • the specifications of the first buffer layer 3'and the second buffer layer 3" are consistent.
  • the sum of the thickness of the first buffer layer 3'and the second buffer layer 3" is greater than or equal to the thickness of the transition section 23, which can effectively reduce the edge stress effect of the overlapping space and reduce the edge Crack abnormal.
  • the manufacturing method may also include pre-welding the welding ribbon 2 to the corresponding electrode on the front of the solar cell 1, which can be implemented by local spot welding or bonding.
  • pre-welding the welding ribbon 2 to the corresponding electrode on the front of the solar cell 1 which can be implemented by local spot welding or bonding.
  • the manufacturing method of the photovoltaic module of the present invention further includes:
  • n electrodes namely, main grid lines 11
  • At least one dividing line 17 is formed on the side surface 10 of the solar cell 1 to divide the solar cell 1 into a plurality of battery strip regions, and the extending direction of the dividing line 17 is perpendicular to the first direction;
  • a buffer layer 3 is respectively provided on one side surface of each battery strip area, and the buffer layer 3 is arranged along the long side of the battery strip area;
  • the battery bar has a first edge 13 and a second edge 14 that extend in parallel along the long sides of the battery bar area, and the surface of the battery bar is provided with a first strip-shaped buffer layer adjacent to the first edge 13 3a and the second strip-shaped buffer layer 3b adjacent to the second edge 14, the cutting line 17 is located between the first strip-shaped buffer layer 3a and the second strip-shaped buffer layer 3b, so that Minimize the ratio of overlapping two cutting edges in laminated photovoltaic modules.
  • the present application places a buffer layer 3 matching the solder ribbon 2 between the adjacent solar cells 1 to reduce the pressing force between the solder ribbon 2 and two adjacent solar cells 1 and reduce the edge
  • the stress has the effect of alleviating the hard contact between the solar cell 1 and the soldering ribbon 2, thereby reducing the split rate of the photovoltaic module; and the manufacturing method provided in this application has a good compatibility with the existing photovoltaic module manufacturing process. Conducive to on-site implementation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Photovoltaic Devices (AREA)

Abstract

La présente invention se rapporte à un ensemble photovoltaïque et à son procédé de fabrication. L'ensemble photovoltaïque comprend une pluralité de chaînes de cellules. La chaîne de cellules comprend une pluralité de cellules solaires, une bande de brasage et une couche tampon. La bande de brasage est utilisée pour connecter deux cellules solaires adjacentes, de telle sorte que la pluralité de cellules solaires sont connectées en une chaîne La couche tampon peut être disposée au niveau d'un bord de la cellule solaire sur lequel la bande de brasage traverse et positionnée entre une surface de la cellule solaire comportant une électrode et la bande de brasage. Dans l'ensemble photovoltaïque de la présente invention, une couche tampon est disposée au niveau d'une surface d'une cellule solaire pour amortir le contact dur entre la cellule solaire et une bande de brasage, réduisant ainsi un taux de rupture de cellule de l'ensemble photovoltaïque.
PCT/CN2020/075813 2019-03-07 2020-02-19 Ensemble photovoltaïque et son procédé de fabrication WO2020177530A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201910171480.0 2019-03-07
CN201910171480.0A CN109786492B (zh) 2019-03-07 2019-03-07 光伏组件及其制造方法
CN201910616091.4 2019-07-09
CN201910616091.4A CN112216752A (zh) 2019-07-09 2019-07-09 光伏组件的制造方法

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WO2020177530A1 true WO2020177530A1 (fr) 2020-09-10

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* Cited by examiner, † Cited by third party
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US11721776B2 (en) 2021-07-16 2023-08-08 Shanghai Jinko Green Energy Enterprise Management Co., Ltd. Photovoltaic module
CN113665233A (zh) * 2021-10-25 2021-11-19 晋能清洁能源科技股份公司 一种hjt电池丝网及其印刷方法
CN113665233B (zh) * 2021-10-25 2022-01-25 晋能清洁能源科技股份公司 一种hjt电池丝网及其印刷方法

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