WO2021013275A2 - Shingled assembly, solar cell pieces, and manufacturing method for shingled assembly - Google Patents

Shingled assembly, solar cell pieces, and manufacturing method for shingled assembly Download PDF

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Publication number
WO2021013275A2
WO2021013275A2 PCT/CN2020/118178 CN2020118178W WO2021013275A2 WO 2021013275 A2 WO2021013275 A2 WO 2021013275A2 CN 2020118178 W CN2020118178 W CN 2020118178W WO 2021013275 A2 WO2021013275 A2 WO 2021013275A2
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WIPO (PCT)
Prior art keywords
section
solar cell
segment
line
sheet
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PCT/CN2020/118178
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French (fr)
Chinese (zh)
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WO2021013275A3 (en
Inventor
尹丙伟
孙俊
陈登运
丁二亮
丁士引
李岩
石刚
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成都晔凡科技有限公司
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Publication of WO2021013275A2 publication Critical patent/WO2021013275A2/en
Publication of WO2021013275A3 publication Critical patent/WO2021013275A3/en

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor 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
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor 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
    • H01L31/04Semiconductor 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
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/048Encapsulation of modules
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor 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
    • H01L31/04Semiconductor 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
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/05Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504Electrical 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor 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
    • H01L31/18Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the field of energy, in particular to a manufacturing method of a shingled component, a solar cell sheet and a shingled component.
  • shingled modules use the electrical principle of low current and low loss (the power loss of photovoltaic modules is proportional to the square of the operating current) to greatly reduce the power loss of the modules. Secondly, it generates electricity by making full use of the inter-chip spacing area of the battery assembly, and the energy density per unit area is high.
  • conductive adhesives with elastomer properties are currently used instead of conventional photovoltaic metal ribbons for modules. Because the photovoltaic metal ribbons exhibit higher series resistance in the entire cell, the current loop of the conductive adhesive has a much shorter stroke than welding. The method of ribbons finally makes the shingled modules become highly efficient modules.
  • the reliability of outdoor applications is better than the performance of conventional photovoltaic modules, because the shingled modules avoid the stress damage to the battery and battery interconnection position and other confluence areas by the metal soldering strip .
  • the failure probability of conventional components using metal ribbon interconnection package is much higher than that of crystalline silicon battery chip package after using elastomer conductive adhesive to interconnect and cut. Shingled components.
  • the current mainstream technology of shingle assembly uses conductive adhesive to interconnect the cut cells.
  • a cell chip is shown in Figure 1. Its busbar lines are generally arranged continuously and singly along the edge, and the cell chips are connected by conductive glue. Realize conductive connection.
  • the conductive adhesive is mainly composed of a conductive phase and an adhesive phase.
  • the conductive phase is mainly composed of precious metals, such as pure silver particles or silver-coated copper, silver-coated nickel, silver-coated glass and other particles, and is used to conduct electricity between solar cells. Its particle shape and distribution meet the optimal electrical conductivity As a benchmark, currently more flake or ball-like combination silver powder with D50 ⁇ 10um level is mostly used.
  • the adhesive phase is mainly composed of high-molecular resin polymers with weather resistance, and acrylic resin, silicone resin, epoxy resin, polyurethane, etc. are usually selected according to the adhesive strength and weather resistance stability.
  • acrylic resin, silicone resin, epoxy resin, polyurethane, etc. are usually selected according to the adhesive strength and weather resistance stability.
  • conductive adhesive manufacturers will complete the design of conductive phase and bonding phase formula to ensure The performance stability of shingled components in the initial environmental corrosion test and long-term outdoor practical application.
  • the battery components connected by conductive glue after being packaged, they are subject to environmental erosion during actual outdoor use, such as high and low temperature alternating thermal expansion and contraction resulting in relative displacement between the conductive glue.
  • the most serious cause is the virtual connection or even open circuit of the current.
  • the main reason is generally the weak connection ability between the materials after the combination.
  • the weak connection ability is mainly manifested in that the conductive adhesive operation in the process requires a process operation window. In the actual production process, this window is relatively narrow and is very susceptible to environmental factors, such as the temperature and humidity of the workplace, and the time spent in the air after applying the glue. Length and so on will make the conductive glue lose its activity.
  • the conductive adhesive is mainly composed of polymer resin and a large amount of precious metal powder, which is expensive and destroys the ecological environment to a certain extent (the production and processing of precious metals pollute the environment).
  • the conductive adhesive is a paste, which has a certain degree of fluidity during the sizing or lamination process, and it is very easy to overflow the glue and cause the short circuit of the positive and negative electrodes of the shingled interconnected battery string.
  • most shingled components made by conductive adhesive bonding have the characteristics of weak interconnection strength, high environmental requirements for the manufacturing process, easy short-circuiting when the process is used, high cost of use, and low production efficiency. .
  • the purpose of the present invention is to provide a shingled module, a solar cell sheet and a manufacturing method of the shingled module.
  • the main grid lines of the solar cell sheet are divided into three regions according to their respective functions, which can realize the solar cell
  • the direct conductive contact between the chips can also meet the efficiency requirements of the main grid line to collect current and the integrity requirements of the main grid line.
  • the solar cells can be electrically conductive through the direct contact of the main grid lines, there is no need to provide conductive glue, which can avoid a series of problems such as short circuit and glue opening that may be caused by the conductive glue.
  • a shingled assembly comprising a plurality of solar cell sheets, and the plurality of solar cell sheets are arranged in a shingled manner along a first direction and opposed by an adhesive.
  • the solar cell sheets include a base sheet, each of the base sheet is provided with a busbar line on the top surface and the bottom surface, at least one of the top surface and the bottom surface
  • the busbar line on the upper part is a multi-segment busbar line, and the multi-segment busbar line includes a first section, a third section, and a connection between the first section and the third section.
  • the second section and the third section extend along a straight line on the surface on which they are located, and the first section extends in a direction deviating from the extension of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive;
  • the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
  • the second section and the third section extend along a longitudinal edge of the base sheet, and the first section extends from the longitudinal edge on the surface on which it is located. It is recessed toward the other longitudinal edge of the base sheet.
  • the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the third section is further concave toward the longitudinal edge.
  • the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section and the second section.
  • the widths of the first section, the second section and the third section are equal, or the widths of the first section and the second section are smaller than the width of the The width of the third section.
  • the width of the first section is smaller than the width of the third section, and the width of the second section is from the third section to the first section. Taper in the direction.
  • the inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width;
  • the inner and outer edges of the second section are gradually approaching each other to form a tapered width.
  • the height of the third section is greater than the height of the second section, so that any pair of adjacent solar cell sheets facing each other on the first busbar line There is a gap between the two sections in a direction perpendicular to the base sheet.
  • the thickness of the second section tapers in a direction from the third section to the first section.
  • the third section is a solid strip structure.
  • a hollow part is provided on the third section.
  • the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
  • the bus bars on the top surface and the bottom surface of the solar cell are both multi-segment bus bars, and the length of the third section on the top surface of the solar cell is It is not equal to the length of the third section located on the bottom surface of the solar cell sheet.
  • the bus bars on the top surface and the bottom surface of the solar cell sheet are both multi-segment bus bars, and the surface of the third section facing away from the base sheet is formed in a zigzag shape
  • the third sections facing each other of two adjacent solar cell sheets are in contact with each other in the form of rack meshing.
  • the joint height of the third section of each pair of adjacent solar cell sheets in contact is greater than or equal to the height of the adhesive.
  • the busbar on one of the top surface and the bottom surface of each solar cell sheet is a multi-segment busbar, and the busbar on the other is intermittently arranged
  • the multi-segment gate line structure wherein, in the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure The portion is at least aligned with the first section of the multi-section grid line.
  • the adhesive is not conductive.
  • a solar cell sheet A plurality of the solar cell sheets can be arranged in a shingled manner in a first direction and fixed with respect to each other by an adhesive.
  • the battery sheet includes a base sheet, a top surface and a bottom surface of the base sheet are each provided with a busbar line, and the busbar line on at least one of the top surface and the bottom surface is a multi-segment busbar line ,
  • the multi-segment main grid line includes a first segment, a third segment, and a second segment connected between the first segment and the third segment, wherein:
  • the second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the extending direction of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive;
  • the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
  • the second section and the third section extend along a longitudinal edge of the base sheet, and the first section extends from the longitudinal edge on the surface on which it is located. It is recessed toward the other longitudinal edge of the base sheet.
  • the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the section is further recessed toward the longitudinal edge.
  • the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section and the second section.
  • the widths of the first section, the second section and the third section are equal, or the widths of the first section and the second section are smaller than the width of the The width of the third section.
  • the width of the first section is smaller than the width of the third section, and the width of the second section is from the first section to the third section. Taper in the direction.
  • the inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width;
  • the inner and outer edges of the second section are gradually approaching each other to form a tapered width.
  • the height of the third section is greater than the height of the second section, so that any pair of adjacent solar cell sheets facing each other on the first busbar line There is a gap between the two sections in a direction perpendicular to the base sheet.
  • the thickness of the second section tapers in a direction from the third section to the first section.
  • the third section is a solid strip structure.
  • a hollow part is provided on the third section.
  • the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
  • the bus bars on the top surface and the bottom surface of the solar cell are both multi-segment bus bars, and the length of the third section on the top surface of the solar cell is It is not equal to the length of the third section located on the bottom surface of the solar cell sheet.
  • the surface of the third section facing away from the base sheet is formed in a zigzag structure, so that the bus bars of the two adjacent solar cell sheets facing each other The third sections are in contact with each other in the form of rack engagement.
  • the thickness of the main grid line is configured such that the joint height of the third section of each pair of adjacent solar cell sheets is greater than or equal to that of the adhesive. height.
  • the busbar on one of the top surface and the bottom surface is a multi-segment busbar, and the busbar on the other is a multi-segment busbar structure intermittently arranged, wherein, In the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure is at least aligned with the multi-segment The first sections of the grid lines are aligned.
  • a manufacturing method of the shingled assembly according to any one of the above solutions, the manufacturing method comprising the following steps:
  • each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet
  • Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line
  • the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the direction in which the second section and the third section extend so as to leave a space in the direction in which the second section and the third section extend.
  • the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells;
  • the plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
  • the step of manufacturing the plurality of solar cells includes:
  • the whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
  • the step of preprocessing the entire solar cell sheet includes:
  • An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;
  • An outer passivation layer is grown and deposited on the middle passivation layer.
  • the inner passivation layer is deposited by thermal oxidation or laughing gas oxidation or ozonation or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or
  • the middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
  • the outer passivation layer is deposited by PVD, CVD or ALD method.
  • the method does not include the step of applying conductive glue.
  • the main grid lines of the solar cells are divided into three regions according to their respective functions, which can realize the direct conductive contact between the solar cells without providing conductive glue, and at the same time can meet the efficiency requirements of the main grid lines to collect current And the integrity requirements of the busbar.
  • Figure 1 is a schematic front view of a conventional solar cell
  • Figure 2 is a front view of the shingle assembly of a preferred embodiment of the present invention.
  • 3A and 3B are respectively a view of the back and front of a solar cell sheet according to a preferred embodiment of the present invention.
  • Figure 4 is a partial enlarged view of part B in Figure 3;
  • FIG. 5 is an alternative solution of FIG. 4, which also shows a partially enlarged view of part B that may be realized in FIG. 3;
  • FIG. 6 is another alternative solution of FIG. 4, which also shows a partially enlarged view of the possible part B in FIG. 3;
  • FIG. 7 is another alternative solution of FIG. 4, which also shows a partial enlarged view of the possible part B in FIG. 3;
  • Fig. 8 is a front view of the solar cell sheet in Fig. 3 after an adhesive is applied;
  • Figure 9 is a partial enlarged view of part C in Figure 3.
  • FIG. 10 is an alternative solution of FIG. 9, which also shows a partial enlarged view of part C that may be realized in FIG. 3;
  • FIG. 11 is another alternative solution of FIG. 9, which also shows a partially enlarged view of part C that may be realized in FIG. 3;
  • Fig. 12 is a schematic cross-sectional view of a preferred embodiment taken along line A-A in Fig. 2.
  • the present invention provides a shingled module, a solar cell sheet and a method of manufacturing the shingled module.
  • Figures 2 to 12 show several preferred embodiments of the present invention.
  • Fig. 2 shows a shingle assembly 2 of a preferred embodiment of the present invention.
  • first direction mentioned later can be understood as the arrangement direction of each solar cell in the shingled assembly 2, which is roughly the same as the width direction of each rectangular solar cell.
  • D1 in Figure 2 One direction is shown by D1 in Figure 2; the "second direction” can be understood as the direction in which the second and third sections of the multi-segment busbar line (which will be described in detail later) extend.
  • D2 shows a shingle assembly 2 of a preferred embodiment of the present invention.
  • the shingled assembly 2 includes a plurality of solar cell sheets 1, and the structures of the bottom surface 25 and the top surface 24 of the solar cell sheet 1 are roughly shown in FIGS. 3A and 3B, respectively.
  • the solar cell sheet 1 includes a base sheet, and the base sheet is preferably made of silicon.
  • a plurality of grid lines are printed on the surface of the substrate sheet.
  • the grid lines include sub-grid lines for current collection and main grid lines for confluence. Among them, the main grid lines on the top surface of the substrate sheet are also called positive
  • the electrode, the bus bar located on the bottom surface of the base sheet is also called the back electrode, and the positive electrode and the back electrode are preferably made of silver.
  • the positive electrode 13 is a multi-segment bus line
  • the multi-segment bus line includes a first section 131, a third section 133 and connected to the first section 131 and third The second section 132 between the sections 133.
  • the second section 132 and the third section 133 extend along a straight line on the top surface 24 of the base sheet.
  • the extension direction of the second section 132 and the third section 133 is marked as the second direction D2, the second direction D2 is substantially perpendicular to the first direction D1, and the first section 131 extends away from the extension direction of the second section 132 and the third section 133, thereby leaving in the extension direction of the second section 132 and the third section 133.
  • Leave space for applying adhesive The third section 133 can directly contact the main grid lines of the solar cells adjacent to it to realize the conductive connection between the solar cells.
  • the second section 132 is mainly used for collecting current from the secondary grid line.
  • the back electrode 12 is a multi-segment gate line structure intermittently arranged instead of a multi-segment main gate line.
  • the specific structure of the back electrode will be described in detail later.
  • FIG. 4 An embodiment of the positive electrode 13 formed as a multi-segment bus line is shown in FIG. 4.
  • the second section 132 and the third section 133 extend along one longitudinal edge of the base sheet, and the first section 131 is recessed inwardly on the top surface from the longitudinal edge toward the other longitudinal edge of the base sheet.
  • the longitudinal edge along which the second section 132 and the third section 133 extend is called the left longitudinal edge
  • the other longitudinal edge is called the right longitudinal edge
  • the left longitudinal edge points to the right
  • the direction of the longitudinal edge is shown by D1+ in FIG. 4. It can be understood that the first section 131 is concave inward along the direction D1+ from the second section 132 and the third section 133.
  • the first section 131 extends relative to the extending direction of the second section 132 and the third section 133, thereby leaving space for the adhesive on the second section 132 and the third section 133.
  • the state where the adhesive 4 is applied to the solar cell sheet at the reserved space is shown in FIG. 8.
  • the first section 131 includes a central section 131a and two connecting sections 131b, wherein the central section 131a extends parallel to the second direction D2, and the connecting section 131b is connected between the central section 131a and the second section 132 between.
  • the central section 131a and the connecting section 131b are both straight sections, but in other embodiments not shown, the first section may be an arc section.
  • the widths of the second section 132 and the first section 131 are smaller than the third section 133.
  • This arrangement is because a narrow grid line can effectively complete the confluence, and the grid line part used to lead the current to another solar cell needs to have a wider thickness, so the embodiment shown in Figure 4 can both
  • the third section 133 can be in effective conductive contact with another main grid line.
  • the first section, the second section, and the third section may have equal widths.
  • FIG. 5 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line.
  • the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 4, but the width of the second section 132a gradually increases in the direction from the third section 133 to the first section 131.
  • the end of the second section 132 connected to the third section 133 has the same width as the third section 133
  • the end of the second section 132a connected to the first section 131 has the same width as the first section 131.
  • the sections 131 are of equal width.
  • the inner edge of the second section 132 is flush with the inner edge of the third section 133, except that the outer edge of the second section 132 approaches the inner edge section to form a tapered width.
  • FIG. 6 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line.
  • the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 5, but the width of the second section 132b gradually increases in the direction from the third section 133 to the first section 131. Shrink.
  • the end of the second section 132b connected to the third section 133 has the same width as the third section 133, but the width of the end connected to the first section 131 is still greater than that of the first section The width.
  • the inner edge and the outer edge of the second section 132b both approach each other to form a tapered width.
  • Fig. 7 shows yet another embodiment of a multi-segment busbar.
  • the arrangement of the second section 132c and the third section 133 is substantially similar to the above-mentioned several embodiments, the second direction D2 is a direction close to a longitudinal edge of the base sheet, and the first section 134 is The top surface of the base sheet is further recessed from the extending direction of the second section 132c and the third section 133 toward the longitudinal edge, and the recessed direction of the first section 134 can be shown by D1- in FIG. 7.
  • Such an arrangement can make the first section 134 hidden in the battery overlap area after the lamination, thereby making the appearance of the shingle assembly more beautiful.
  • the third section of the multi-section busbar can also have a variety of alternative implementations.
  • the third section 133a is provided with a hollow part, and the hollow part is formed in a triangular hole structure, and every three triangular holes are arranged in a group along the second direction.
  • the third section 133b is also provided with a hollow part, the hollow part is formed as a circular hole structure, and every five circular holes are arranged in a group along the second direction.
  • the third section 133 is a solid structure, and the third section 133 smoothly transitions to the second section 132.
  • the back electrode 12 of the solar cell sheet can be a multi-segment grid line structure intermittently arranged.
  • each segment of the grid line 121 of the multi-segment grid line structure is at least connected to the multi-segment grid line structure.
  • the third section 133 of the main grid line is aligned so that in the shingled assembly, the third section 133 of one of the two adjacent solar cells can be in contact with the grid lines 121 of the other.
  • the spacing portion 122 of the multi-segment grid line structure is at least aligned with the first section 131 of the multi-segment grid line, so that for adjacent solar cells, the first section 131 of one of the The space left in the second direction can accommodate the adhesive together with the other spacer 121.
  • the positive electrode and the back electrode of the solar cell can be configured as a multi-segment busbar.
  • Figure 12 shows the connection structure of two adjacent solar cells, in which the one on the top side The back electrode 12a of the solar cell 1 and the positive electrode 13 of the solar cell 1 on the bottom side are both multi-segment busbars.
  • S1 represents the area corresponding to the first section
  • S2 represents the area corresponding to the second section
  • S3 represents the area corresponding to the third section.
  • the third section of the positive electrode 13 and the back electrode 13a are in contact with each other, and the contact surface is marked as the conductive contact surface 23; the first section of the positive electrode 13 and the back electrode 12a is reserved for accommodation
  • the space of the adhesive 4 in which the adhesive 4 is applied and the height of the adhesive 4 is less than or equal to the joining height of the two third sections.
  • the connecting part between the first section and the third section is the second section. It can be seen from FIG. 12 that the second sections of the two solar cells 1 are not tightly joined but are perpendicular to the substrate. There is a gap 26 in the direction of the sheet, that is, the height of the second section is smaller than the height of the third section. Preferably, as shown in the figure, the thickness of the second section is reduced in the direction from the third section to the first section.
  • the adhesive can be made of non-conductive materials.
  • the adhesive can be acrylic resin, silicone resin, epoxy resin, polyurethane, etc.
  • the agent is, for example, a curing agent, a crosslinking agent, a coupling agent, or rubber balls.
  • the solar cell sheet may also have more preferred settings.
  • the length of the third section on the top surface may be greater than or less than the length of the third section on the bottom surface.
  • the busbar lines on the top surface and the bottom surface of the solar cell sheet are both multi-segment busbar lines, the surface of the third section facing away from the base sheet may be formed in a zigzag structure, and two adjacent ones The third sections of the solar cells facing each other can be in contact with each other in the form of rack engagement.
  • the present invention also provides a manufacturing method for manufacturing the above-mentioned shingled assembly, which includes the following steps:
  • each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet
  • Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line
  • the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the extension direction of the second section and the third section so as to leave a space in the extension direction of the second section and the third section for applying the adhesive ;
  • the third section can directly contact the main grid lines of the adjacent solar cells to realize the conductive connection between the solar cells;
  • the plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
  • the step of manufacturing the plurality of solar cell sheets includes:
  • the whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
  • the step of preprocessing the entire solar cell sheet includes:
  • An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;
  • An outer passivation layer is grown and deposited on the middle passivation layer.
  • the inner passivation layer is deposited by thermal oxidation, laughing gas oxidation, ozonation, or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or
  • the middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
  • the outer passivation layer is deposited by PVD, CVD or ALD method.
  • the adhesive is a non-conductive adhesive, and the method does not include an additional step of applying conductive adhesive.
  • the various processes mentioned above can be more specific and optimized.
  • monocrystalline silicon wafers are used for surface texturing to obtain a good textural structure, so as to increase the specific surface area and accept more photons (energy), while reducing the reflection of incident light.
  • the subsequent steps may include cleaning
  • the step of residual liquid during texturing to reduce the influence of acidic and alkaline substances on battery formation.
  • it can also include the step of making PN junction, which includes: Phosphorus oxychloride reacts with the silicon wafer to obtain phosphorus atoms; after a certain period of time, the phosphorus atoms enter the surface layer of the silicon wafer and pass between the silicon atoms.
  • the voids infiltrate and diffuse into the silicon wafer, forming an interface between N-type semiconductor and P-type semiconductor. Complete the diffusion process and realize the conversion of light energy to electric energy. Since the diffusion junction forms a short-circuit channel at the edge of the silicon wafer, the photogenerated electrons collected on the front side of the PN junction will flow to the back side of the PN junction along the area where phosphorous is diffused at the edge, causing a short circuit. After plasma etching, the edge PN Junction etching removal can avoid short circuits caused by edges, and in addition, SE process steps can be added. In addition, since the diffusion bonding process will form a layer of phosphorous silicate on the surface of the silicon wafer, the dephosphorized silicate glass process reduces the impact on the efficiency of the shingled cell.
  • the silicon wafer can be laser slotted; after printing the electrodes, sintering is performed, and the light decay furnace or electric injection furnace is used to reduce the light-induced attenuation of the battery, and finally the battery test is classified.
  • the step of splitting the silicon wafer into a plurality of solar cell pieces is preferably completed using a laser cutting machine.
  • the sintered whole silicon wafer enters the scribing inspection position for appearance inspection and visual positioning of the OK wafer (the appearance inspection will be automatically shunted to the NG position),
  • the multi-track dicing machine or the preset buffer stack area can be set freely to realize the online continuous feeding operation.
  • the automatic splitting mechanism of the online laser scribing machine completes the splits at the cutting position to realize the natural separation of each solar cell. It should be noted that the laser cutting surface is far away from the PN junction side to avoid leakage current due to damage to the PN junction. It is necessary to confirm the front and back of the cell before dicing and loading. If the direction is opposite, a separate 180° reversing device needs to be added.
  • the solar cell, shingled component and manufacturing method of the present invention enable the interconnection of the solar cells to form a shingled component, and the solar cells realize conductive interconnection through direct contact between the positive electrode and the back electrode.
  • Conductive conductive adhesive In this way, environmental corrosion, high and low temperature alternation, thermal expansion and contraction and other factors that easily damage the conductive adhesive will not affect the shingled component of the present invention, and therefore, current virtual connection and disconnection are unlikely to occur.
  • problems such as open circuit of the positive and negative electrodes of the shingle assembly caused by overflow of glue will not occur.
  • the conductivity of the adhesive is not required, the production cost of the shingled assembly is also reduced.
  • the bottom surface of the solar cell 25 is the bottom surface of the solar cell 25

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Abstract

The present invention relates to a shingled assembly, solar cell pieces, and a manufacturing method for the shingled assembly. A main gate line on a top surface and/or a bottom surface of a solar cell piece in the shingled assembly is a multi-segment main gate line. For any one multi-segment main gate line, a second segment and a third segment extend a long a straight line on the surface same are located on, while a first segment extends skewing away from the extension direction of the second segment and the third segment, thereby leaving space in the extension direction of the second segment and the third segment for applying a binder. The third segment is able to be in direct contact with the main gate line of an adjacent solar cell piece and thereby implement conductive connection between solar cell pieces. In the solution provided in the present invention, main gate lines of solar cell pieces divide out three regions according to the function of each, thus being allowing for direct conductive contact between solar cell pieces without requiring the arrangement of a conductive adhesive, while also being able to satisfy the efficiency requirements for current collection in main gate lines, and the requirement to conserve silver paste in cells.

Description

叠瓦组件、太阳能电池片和叠瓦组件的制造方法Shingled module, solar cell sheet and manufacturing method of shingled module 技术领域Technical field
本发明涉及能源领域,尤其涉及一种叠瓦组件、太阳能电池片和叠瓦组件的制造方法。The invention relates to the field of energy, in particular to a manufacturing method of a shingled component, a solar cell sheet and a shingled component.
背景技术Background technique
随着全球煤炭、石油、天然气等常规化石能源消耗速度加快,生态环境不断恶化,特别是温室气体排放导致日益严峻的全球气候变化,人类社会的可持续发展已经受到严重威胁。世界各国纷纷制定各自的能源发展战略,以应对常规化石能源资源的有限性和开发利用带来的环境问题。太阳能凭借其可靠性、安全性、广泛性、长寿性、环保性、资源充足性的特点已成为最重要的可再生能源之一,有望成为未来全球电力供应的主要支柱。As the global consumption of conventional fossil energy such as coal, oil, and natural gas accelerates, the ecological environment continues to deteriorate, especially greenhouse gas emissions leading to increasingly severe global climate changes, and the sustainable development of human society has been seriously threatened. Countries around the world have formulated their own energy development strategies to cope with the finiteness of conventional fossil energy resources and environmental problems caused by development and utilization. Solar energy has become one of the most important renewable energy due to its reliability, safety, versatility, longevity, environmental protection, and resource adequacy, and is expected to become the main pillar of global power supply in the future.
在新一轮能源变革过程中,我国光伏产业已成长为具有国际竞争优势的战略新兴产业。然而,光伏产业发展仍面临诸多问题与挑战,转换效率与可靠性是制约光伏产业发展的最大技术障碍,而成本控制与规模化又在经济上形成制约。光伏组件作为光伏发电的核心部件,提高其转换效率发展高效组件是必然趋势。目前市场上涌现各种各样的高效组件,如叠瓦、半片、多主栅、双面组件等。随着光伏组件的应用场所和应用地区越来越广泛,对其可靠性要求越来越高,尤其是在一些恶劣或极端天气多发地区需要采用高效、高可靠性的光伏组件。In the new round of energy reform, my country's photovoltaic industry has grown into a strategic emerging industry with international competitive advantages. However, the development of the photovoltaic industry still faces many problems and challenges. Conversion efficiency and reliability are the biggest technical obstacles restricting the development of the photovoltaic industry, and cost control and scale are economic constraints. As the core component of photovoltaic power generation, photovoltaic modules are an inevitable trend to improve their conversion efficiency and develop high-efficiency modules. At present, various high-efficiency components are emerging on the market, such as shingled, half-cell, multi-busbar, and double-sided components. As the application places and application areas of photovoltaic modules become more and more extensive, their reliability requirements are getting higher and higher, especially in some harsh or extreme weather-prone areas, it is necessary to use efficient and highly reliable photovoltaic modules.
在大力推广和使用太阳能绿色能源的背景下,叠瓦组件利用小电流低损耗的电学原理(光伏组件功率损耗与工作电流的平方成正比例关系)从而使得组件功率损耗大大降低。其次通过充分利用电池组件中片间距区域来进行发电,单位面积内能量密度高。另外目前使用了具有弹性体特性的导电胶粘剂替代了常规组件用光伏金属焊带,由于光伏金属焊带在整片电池中表现出较高的串联电阻而导电胶粘剂电 流回路的行程要远小于采用焊带的方式,从而最终使得叠瓦组件成为高效组件,同时户外应用可靠性较常规光伏组件性能表现更加优异,因为叠瓦组件避免了金属焊带对电池与电池互联位置及其他汇流区域的应力损伤。尤其是在高低温交变的动态(风、雪等自然界的载荷作用)环境下,采用金属焊带互联封装的常规组件失效概率远超过采用弹性体的导电胶粘剂互联切割后的晶硅电池小片封装的叠瓦组件。In the context of vigorously promoting and using solar green energy, shingled modules use the electrical principle of low current and low loss (the power loss of photovoltaic modules is proportional to the square of the operating current) to greatly reduce the power loss of the modules. Secondly, it generates electricity by making full use of the inter-chip spacing area of the battery assembly, and the energy density per unit area is high. In addition, conductive adhesives with elastomer properties are currently used instead of conventional photovoltaic metal ribbons for modules. Because the photovoltaic metal ribbons exhibit higher series resistance in the entire cell, the current loop of the conductive adhesive has a much shorter stroke than welding. The method of ribbons finally makes the shingled modules become highly efficient modules. At the same time, the reliability of outdoor applications is better than the performance of conventional photovoltaic modules, because the shingled modules avoid the stress damage to the battery and battery interconnection position and other confluence areas by the metal soldering strip . Especially in the dynamic environment of high and low temperature alternating (wind, snow and other natural loads) environment, the failure probability of conventional components using metal ribbon interconnection package is much higher than that of crystalline silicon battery chip package after using elastomer conductive adhesive to interconnect and cut. Shingled components.
当前叠瓦组件的主流工艺使用导电胶粘剂互联切割后的电池片,这样的电池片小片如图1示出,其主栅线大致沿其边缘连续且单一地设置,电池片小片之间通过导电胶实现导电连接。导电胶主要由导电相和粘接相构成。其中导电相主要由贵金属组成,如纯银颗粒或银包铜、银包镍、银包玻璃等颗粒并用于在太阳能电池片之间起导电作用,其颗粒形状和分布以满足最优的电传导为基准,目前更多采用D50<10um级的片状或类球型组合银粉居多。粘接相主要有具有耐候性的高分子树脂类聚合物构成,通常根据粘接强度和耐候稳定性选择丙烯酸树脂、有机硅树脂、环氧树脂、聚氨酯等。为了使导电胶粘接达到较低的接触电阻和较低的体积电阻率及高粘接并且保持长期优良的耐候特性,一般导电胶厂家会通过导电相和粘接相配方的设计完成,从而保证叠瓦组件在初始阶段环境侵蚀测试和长期户外实际应用下性能的稳定性。The current mainstream technology of shingle assembly uses conductive adhesive to interconnect the cut cells. Such a cell chip is shown in Figure 1. Its busbar lines are generally arranged continuously and singly along the edge, and the cell chips are connected by conductive glue. Realize conductive connection. The conductive adhesive is mainly composed of a conductive phase and an adhesive phase. The conductive phase is mainly composed of precious metals, such as pure silver particles or silver-coated copper, silver-coated nickel, silver-coated glass and other particles, and is used to conduct electricity between solar cells. Its particle shape and distribution meet the optimal electrical conductivity As a benchmark, currently more flake or ball-like combination silver powder with D50<10um level is mostly used. The adhesive phase is mainly composed of high-molecular resin polymers with weather resistance, and acrylic resin, silicone resin, epoxy resin, polyurethane, etc. are usually selected according to the adhesive strength and weather resistance stability. In order to achieve low contact resistance, low volume resistivity, high bonding and long-term excellent weather resistance for conductive adhesive bonding, generally conductive adhesive manufacturers will complete the design of conductive phase and bonding phase formula to ensure The performance stability of shingled components in the initial environmental corrosion test and long-term outdoor practical application.
而对于通过导电胶来实现连接的电池组件,在被封装之后,在户外实际使用时受到环境侵蚀,例如高低温交变热胀冷缩产生导电胶之间的相对位移。最为严重就是导致出现电流虚接甚至断路,主要原因一般都是因为材料组合后相互间连接能力弱。连接能力弱主要表现在制程中导电胶作业需要一个工艺操作窗口,实际生产过程中这个窗口相对较窄,非常容易受到环境因素的影响,比如作业场所的温湿度,涂胶后滞留空气中的时间长短等等都会让导电胶水失去活性。同时对于点胶、喷胶或印刷工艺下受胶水自身特性变化容易出现施胶不均缺失现象,对产品可靠性会有较大隐患。其次导电胶主要由高分子树脂和大量贵金属粉体所构成,成本高昂且一定程度上破坏生态环境(贵 金属的生产和加工对环境污染较大)。再者导电胶属于膏状物,在施胶或叠片过程中具备一定的流动性,非常容易溢胶造成叠瓦互联电池串正负极短路。As for the battery components connected by conductive glue, after being packaged, they are subject to environmental erosion during actual outdoor use, such as high and low temperature alternating thermal expansion and contraction resulting in relative displacement between the conductive glue. The most serious cause is the virtual connection or even open circuit of the current. The main reason is generally the weak connection ability between the materials after the combination. The weak connection ability is mainly manifested in that the conductive adhesive operation in the process requires a process operation window. In the actual production process, this window is relatively narrow and is very susceptible to environmental factors, such as the temperature and humidity of the workplace, and the time spent in the air after applying the glue. Length and so on will make the conductive glue lose its activity. At the same time, it is prone to uneven sizing due to changes in the characteristics of the glue under the glue dispensing, spraying or printing process, which will have greater hidden dangers to product reliability. Secondly, the conductive adhesive is mainly composed of polymer resin and a large amount of precious metal powder, which is expensive and destroys the ecological environment to a certain extent (the production and processing of precious metals pollute the environment). Furthermore, the conductive adhesive is a paste, which has a certain degree of fluidity during the sizing or lamination process, and it is very easy to overflow the glue and cause the short circuit of the positive and negative electrodes of the shingled interconnected battery string.
也就是说,对于大多数采用导电胶粘接方式而制成的叠瓦组件,存在相互连接强度弱特点,制程对环境要求高,工艺使用易溢胶短路,使用成本高昂,生产效率低等问题。That is to say, most shingled components made by conductive adhesive bonding have the characteristics of weak interconnection strength, high environmental requirements for the manufacturing process, easy short-circuiting when the process is used, high cost of use, and low production efficiency. .
为了解决这些问题,需要采用不具导电性的粘结剂来取代导电胶。那么,太阳能电池片则需要具有除了导电胶以外的导电措施以保证各个太阳能电池片之间的导电连接。如何在保证太阳能电池片间的导电连接的基础上又不影响主栅线收集电流,在保证粘结剂有效施加的基础上又不破坏主栅线的结构,是一个亟待解决的问题。In order to solve these problems, it is necessary to use a non-conductive adhesive to replace the conductive glue. Then, the solar cells need to have conductive measures other than the conductive glue to ensure the conductive connection between the solar cells. How to ensure the conductive connection between the solar cells without affecting the current collection of the busbar line and ensuring the effective application of the adhesive without destroying the structure of the busbar line is an urgent problem to be solved.
因而需要提供一种叠瓦组件、太阳能电池片和叠瓦组件的制造方法,以至少部分地解决上述问题。Therefore, it is necessary to provide a shingled module, a solar cell sheet, and a manufacturing method of the shingled module to at least partially solve the above-mentioned problems.
发明内容Summary of the invention
本发明的目的在于,提供一种叠瓦组件、太阳能电池片和叠瓦组件的制造方法,在本发明中,太阳能电池片的主栅线按照其各自功能划分出三个区域,能够实现太阳能电池片之间的直接导电接触,同时还可以满足主栅线收集电流的效率要求以及主栅线的完整性要求。The purpose of the present invention is to provide a shingled module, a solar cell sheet and a manufacturing method of the shingled module. In the present invention, the main grid lines of the solar cell sheet are divided into three regions according to their respective functions, which can realize the solar cell The direct conductive contact between the chips can also meet the efficiency requirements of the main grid line to collect current and the integrity requirements of the main grid line.
并且,由于太阳能电池片之间可以通过主栅线的直接接触而实现导电,因而无需设置导电胶,这样便能够避免可能由导电胶引起的短路、开胶等一系列问题。Moreover, since the solar cells can be electrically conductive through the direct contact of the main grid lines, there is no need to provide conductive glue, which can avoid a series of problems such as short circuit and glue opening that may be caused by the conductive glue.
根据本发明的一个方面,提供了一种叠瓦组件,所述叠瓦组件包括多个太阳能电池片,多个所述太阳能电池片沿第一方向以叠瓦方式依次排列并通过粘结剂相对于彼此固定,其中,所述太阳能电池片包括基体片,每个所述基体片的顶表面和底表面的上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:According to one aspect of the present invention, there is provided a shingled assembly, the shingled assembly comprising a plurality of solar cell sheets, and the plurality of solar cell sheets are arranged in a shingled manner along a first direction and opposed by an adhesive. To be fixed to each other, wherein the solar cell sheets include a base sheet, each of the base sheet is provided with a busbar line on the top surface and the bottom surface, at least one of the top surface and the bottom surface The busbar line on the upper part is a multi-segment busbar line, and the multi-segment busbar line includes a first section, a third section, and a connection between the first section and the third section. The second part, in which:
所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段沿偏离所述第二部段和所述第三部段延伸的方向延伸从而在所述第二部段和所述第三部段的延伸方向上留出空间以用于施加所述粘结剂;并且The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends in a direction deviating from the extension of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and
所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接。The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
在一种实施方式中,所述第二部段和所述第三部段沿所述基体片的一个纵向边缘延伸的方向,所述第一部段在其所在的表面上从所述纵向边缘朝向所述基体片的另一个纵向边缘凹入。In one embodiment, the second section and the third section extend along a longitudinal edge of the base sheet, and the first section extends from the longitudinal edge on the surface on which it is located. It is recessed toward the other longitudinal edge of the base sheet.
在一种实施方式中,所述第二部段和所述第三部段靠近所述基体片的一个纵向边缘延伸,所述第一部段在其所在的表面上从所述第二部段和所述第三部段的延伸方向进一步朝向所述纵向边缘凹入。In one embodiment, the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the third section is further concave toward the longitudinal edge.
在一种实施方式中,所述第一部段包括中心段和连接段,所述中心段平行于所述第二方向延伸,所述连接段连接所述中心段和所述第二部段。In one embodiment, the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section and the second section.
在一种实施方式中,所述第一部段、所述第二部段和所述第三部段的宽度相等,或者所述第一部段、所述第二部段的宽度小于所述第三部段的宽度。In one embodiment, the widths of the first section, the second section and the third section are equal, or the widths of the first section and the second section are smaller than the width of the The width of the third section.
在一种实施方式中,所述第一部段的宽度小于所述第三部段的宽度,且所述第二部段的宽度在自所述第三部段到所述第一部段的方向上渐缩。In one embodiment, the width of the first section is smaller than the width of the third section, and the width of the second section is from the third section to the first section. Taper in the direction.
在一种实施方式中,所述第二部段的内侧边缘与第三部段的内侧边缘平齐,所述第二部段的外侧边缘朝向内侧边缘部段靠近从而形成了渐缩的宽度;或者In one embodiment, the inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or
所述第二部段的内侧边缘与外侧边缘均朝向彼此逐渐靠近从而形成了其渐缩的宽度。The inner and outer edges of the second section are gradually approaching each other to form a tapered width.
在一种实施方式中,所述第三部段的高度大于所述第二部段的高度,以使得任意一对相邻的太阳能电池片的彼此面对的所述主栅线的所述第二部段之间在垂直于所述基体片的方向上存在间隔。In one embodiment, the height of the third section is greater than the height of the second section, so that any pair of adjacent solar cell sheets facing each other on the first busbar line There is a gap between the two sections in a direction perpendicular to the base sheet.
在一种实施方式中,所述第二部段的厚度在自所述第三部段到所述第一部段的方向上渐缩。In one embodiment, the thickness of the second section tapers in a direction from the third section to the first section.
在一种实施方式中,所述第三部段为实心的条状结构。In one embodiment, the third section is a solid strip structure.
在一种实施方式中,所述第三部段上设置有镂空部。In one embodiment, a hollow part is provided on the third section.
在一种实施方式中,所述镂空部为形成在所述第三部段上的圆形孔结构或三角形孔结构。In one embodiment, the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
在一种实施方式中,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,且位于所述太阳能电池片的顶表面上的第三部段的长度不等于位于所述太阳能电池片的底表面上的第三部段的长度。In one embodiment, the bus bars on the top surface and the bottom surface of the solar cell are both multi-segment bus bars, and the length of the third section on the top surface of the solar cell is It is not equal to the length of the third section located on the bottom surface of the solar cell sheet.
在一种实施方式中,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,所述第三部段的背离所述基体片的面形成为锯齿状结构,相邻的两个所述太阳能电池片的彼此面对的所述第三部段以齿条啮合的形式相互接触。In one embodiment, the bus bars on the top surface and the bottom surface of the solar cell sheet are both multi-segment bus bars, and the surface of the third section facing away from the base sheet is formed in a zigzag shape In a structure, the third sections facing each other of two adjacent solar cell sheets are in contact with each other in the form of rack meshing.
在一种实施方式中,每一对相邻的所述太阳能电池片的相接触的所述第三部段的接合高度大于或等于所述粘结剂的高度。In one embodiment, the joint height of the third section of each pair of adjacent solar cell sheets in contact is greater than or equal to the height of the adhesive.
在一种实施方式中,每一个所述太阳能电池片的所述顶表面和所述底表面中的一个上的主栅线为多部段主栅线,另一个上的主栅线为间断设置的多段栅线结构,其中,在所述第一方向上,所述多段栅线结构至少与所述多部段主栅线的所述第三部段对齐,所述多段栅线结构间的间隔部分至少与所述多部段栅线的所述第一部段对齐。In one embodiment, the busbar on one of the top surface and the bottom surface of each solar cell sheet is a multi-segment busbar, and the busbar on the other is intermittently arranged The multi-segment gate line structure, wherein, in the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure The portion is at least aligned with the first section of the multi-section grid line.
在一种实施方式中,所述粘结剂不具导电性。In one embodiment, the adhesive is not conductive.
根据本发明的另一个方面,提供了一种太阳能电池片,多个所述太阳能电池片能够在第一方向上以叠瓦方式依次排列并通过粘结剂相对于彼此固定,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:According to another aspect of the present invention, there is provided a solar cell sheet. A plurality of the solar cell sheets can be arranged in a shingled manner in a first direction and fixed with respect to each other by an adhesive. The battery sheet includes a base sheet, a top surface and a bottom surface of the base sheet are each provided with a busbar line, and the busbar line on at least one of the top surface and the bottom surface is a multi-segment busbar line , The multi-segment main grid line includes a first segment, a third segment, and a second segment connected between the first segment and the third segment, wherein:
所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段偏离所述第二部段和所述第三部段的延伸的方向延伸从而在所述第二部段和所述第三部段的延伸方向上留出空间以用于施加所述粘结剂;并且The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the extending direction of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and
所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接。The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
在一种实施方式中,所述第二部段和所述第三部段沿所述基体片的一个纵向边缘延伸的方向,所述第一部段在其所在的表面上从所述纵向边缘朝向所述基体片的另一个纵向边缘凹入。In one embodiment, the second section and the third section extend along a longitudinal edge of the base sheet, and the first section extends from the longitudinal edge on the surface on which it is located. It is recessed toward the other longitudinal edge of the base sheet.
在一种实施方式中,所述第二部段和所述第三部段靠近所述基体片的一个纵向边缘延伸,所述第一部段在其所在的表面上从所述第二部段和所述部段的延伸方向进一步朝向所述纵向边缘凹入。In one embodiment, the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the section is further recessed toward the longitudinal edge.
在一种实施方式中,所述第一部段包括中心段和连接段,所述中心段平行于所述第二方向延伸,所述连接段连接所述中心段和所述第二部段。In one embodiment, the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section and the second section.
在一种实施方式中,所述第一部段、所述第二部段和所述第三部段的宽度相等,或者所述第一部段、所述第二部段的宽度小于所述第三部段的宽度。In one embodiment, the widths of the first section, the second section and the third section are equal, or the widths of the first section and the second section are smaller than the width of the The width of the third section.
在一种实施方式中,所述第一部段的宽度小于所述第三部段的宽度,且所述第二部段的宽度在自所述第一部段到所述第三部段的方向上渐缩。In one embodiment, the width of the first section is smaller than the width of the third section, and the width of the second section is from the first section to the third section. Taper in the direction.
在一种实施方式中,所述第二部段的内侧边缘与第三部段的内侧边缘平齐,所述第二部段的外侧边缘朝向内侧边缘部段靠近从而形成了渐缩的宽度;或者In one embodiment, the inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or
所述第二部段的内侧边缘与外侧边缘均朝向彼此逐渐靠近从而形成了其渐缩的宽度。The inner and outer edges of the second section are gradually approaching each other to form a tapered width.
在一种实施方式中,所述第三部段的高度大于所述第二部段的高度,以使得任意一对相邻的太阳能电池片的彼此面对的所述主栅线的所述第二部段之间在垂直于所述基体片的方向上存在间隔。In one embodiment, the height of the third section is greater than the height of the second section, so that any pair of adjacent solar cell sheets facing each other on the first busbar line There is a gap between the two sections in a direction perpendicular to the base sheet.
在一种实施方式中,所述第二部段的厚度在自所述第三部段到所述第一部段的方向上渐缩。In one embodiment, the thickness of the second section tapers in a direction from the third section to the first section.
在一种实施方式中,所述第三部段为实心的条状结构。In one embodiment, the third section is a solid strip structure.
在一种实施方式中,所述第三部段上设置有镂空部。In one embodiment, a hollow part is provided on the third section.
在一种实施方式中,所述镂空部为形成在所述第三部段上的圆形孔结构或三角形孔结构。In one embodiment, the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
在一种实施方式中,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,且位于所述太阳能电池片的顶表面上的第三部段的长度不等于位于所述太阳能电池片的底表面上的第三部段的长度。In one embodiment, the bus bars on the top surface and the bottom surface of the solar cell are both multi-segment bus bars, and the length of the third section on the top surface of the solar cell is It is not equal to the length of the third section located on the bottom surface of the solar cell sheet.
在一种实施方式中,所述第三部段的背离所述基体片的面形成为锯齿状结构,以使得相邻的两个所述太阳能电池片的彼此面对的所述主栅线的所述第三部段以齿条啮合的形式相互接触。In one embodiment, the surface of the third section facing away from the base sheet is formed in a zigzag structure, so that the bus bars of the two adjacent solar cell sheets facing each other The third sections are in contact with each other in the form of rack engagement.
在一种实施方式中,所述主栅线的厚度构造为使得每一对相邻的所述太阳能电池片的相接触的所述第三部段的接合高度大于或等于所述粘结剂的高度。In one embodiment, the thickness of the main grid line is configured such that the joint height of the third section of each pair of adjacent solar cell sheets is greater than or equal to that of the adhesive. height.
在一种实施方式中,所述顶表面和所述底表面中的一个上的主栅线为多部段主栅线,另一个上的主栅线为间断设置的多段栅线结构,其中,在所述第一方向上,所述多段栅线结构至少与所述多部段主栅线的所述第三部段对齐,所述多段栅线结构间的间隔部分至少与所述多部段栅线的所述第一部段对齐。In one embodiment, the busbar on one of the top surface and the bottom surface is a multi-segment busbar, and the busbar on the other is a multi-segment busbar structure intermittently arranged, wherein, In the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure is at least aligned with the multi-segment The first sections of the grid lines are aligned.
根据本发明的又一个方面,提供了一种制造根据上述任意一项方案所述的叠瓦组件的制造方法,所述制造方法包括如下步骤:According to another aspect of the present invention, there is provided a manufacturing method of the shingled assembly according to any one of the above solutions, the manufacturing method comprising the following steps:
制造多个太阳能电池片,所述多个太阳能电池片能够在第一方向上以叠瓦方式依次相连,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面的上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:所述第二部段和所述第三部段在其所在的表面上 沿一直线延伸,而所述第一部段偏离所述第二部段和所述第三部段延伸的方向延伸从而在所述第二部段和所述第三部段的延伸方向上留出空间以用于施加所述粘结剂;所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接;Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the direction in which the second section and the third section extend so as to leave a space in the direction in which the second section and the third section extend. Used to apply the adhesive; the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells;
在各个所述太阳能电池片的由所述第一部段留出的空间处施加粘结剂;Applying an adhesive to the space left by the first section of each of the solar cells;
将所述多个太阳能电池片沿所述第一方向以叠瓦方式排列、相互固定并使得任意相邻的两个太阳能电池片的彼此面对的所述主栅线的所述第三部段直接接触。The plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
在一种实施方式中,制造所述多个太阳能电池片的步骤包括:In an embodiment, the step of manufacturing the plurality of solar cells includes:
对整片太阳能电池片进行预处理;Pretreatment of the entire solar cell;
将预处理之后的所述整片太阳能电池片切割成小片从而形成所述多个太阳能电池片。The whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
在一种实施方式中,所述对整片太阳能电池片进行预处理的步骤包括:In one embodiment, the step of preprocessing the entire solar cell sheet includes:
在所述整片太阳能电池片的总基体片表面上制绒;Making texturing on the surface of the total substrate sheet of the whole solar cell sheet;
在所述总基体片的正面和背面均生长沉淀一层内钝化层;An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;
在所述内钝化层上生长沉积一层中钝化层;Growing and depositing a middle passivation layer on the inner passivation layer;
在所述中钝化层上生长沉积一层外钝化层。An outer passivation layer is grown and deposited on the middle passivation layer.
在一种实施方式中,所述内钝化层采用热氧化法或笑气氧化或臭氧化或硝酸溶液化学法沉积,且内钝化层设置为二氧化硅膜层;并且/或者In one embodiment, the inner passivation layer is deposited by thermal oxidation or laughing gas oxidation or ozonation or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or
所述中钝化层采用PECVD或ALD层或固体靶材经PVD层方法沉积,且中钝化层设置为三氧化二铝膜层或含有三氧化二铝的膜层;并且/或者The middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
所述外钝化层采用PVD、CVD或者ALD方法沉积。The outer passivation layer is deposited by PVD, CVD or ALD method.
在一种实施方式中,所述方法不包括施加导电胶的步骤。In one embodiment, the method does not include the step of applying conductive glue.
根据本发明,太阳能电池片的主栅线按照其各自功能划分出三个 区域,能够实现太阳能电池片之间的直接导电接触而无需设置导电胶,同时还可以满足主栅线收集电流的效率要求以及主栅线的完整性要求。According to the present invention, the main grid lines of the solar cells are divided into three regions according to their respective functions, which can realize the direct conductive contact between the solar cells without providing conductive glue, and at the same time can meet the efficiency requirements of the main grid lines to collect current And the integrity requirements of the busbar.
附图说明Description of the drawings
为了更好地理解本发明的上述及其他目的、特征、优点和功能,可以参考附图中所示的优选实施方式。附图中相同的附图标记指代相同的部件。本领域技术人员应该理解,附图旨在示意性地阐明本发明的优选实施方式,对本发明的范围没有任何限制作用,图中各个部件并非按比例绘制。In order to better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention, and do not have any limitation on the scope of the present invention, and the various components in the drawings are not drawn to scale.
图1为传统的太阳能电池片的正面示意图;Figure 1 is a schematic front view of a conventional solar cell;
图2为本发明的一个优选实施方式的叠瓦组件的正面视图;Figure 2 is a front view of the shingle assembly of a preferred embodiment of the present invention;
图3A和图3B分别为本发明的一个优选实施方式的太阳能电池片的背面和正面的视图;3A and 3B are respectively a view of the back and front of a solar cell sheet according to a preferred embodiment of the present invention;
图4为图3中的B部分的局部放大图;Figure 4 is a partial enlarged view of part B in Figure 3;
图5为图4的一种替代性方案,其同样示出了图3中的可能实现的B部分的局部放大图;FIG. 5 is an alternative solution of FIG. 4, which also shows a partially enlarged view of part B that may be realized in FIG. 3;
图6为图4的另一种替代性方案,其同样示出了图3中的可能实现的B部分的局部放大图;FIG. 6 is another alternative solution of FIG. 4, which also shows a partially enlarged view of the possible part B in FIG. 3;
图7为图4的又一种替代性方案,其同样示出了图3中的可能实现的B部分的局部放大图;FIG. 7 is another alternative solution of FIG. 4, which also shows a partial enlarged view of the possible part B in FIG. 3;
图8为图3中的太阳能电池片上施加了粘结剂之后的正面视图;Fig. 8 is a front view of the solar cell sheet in Fig. 3 after an adhesive is applied;
图9为图3中的C部分的局部放大图;Figure 9 is a partial enlarged view of part C in Figure 3;
图10为图9的一种替代性方案,其同样示出了图3中的可能实现的C部分的局部放大图;FIG. 10 is an alternative solution of FIG. 9, which also shows a partial enlarged view of part C that may be realized in FIG. 3;
图11为图9的另一种替代性方案,其同样示出了图3中的可能实现的C部分的局部放大图;FIG. 11 is another alternative solution of FIG. 9, which also shows a partially enlarged view of part C that may be realized in FIG. 3;
图12为沿图2中A-A线截取的一种优选实施方式的截面示意图。Fig. 12 is a schematic cross-sectional view of a preferred embodiment taken along line A-A in Fig. 2.
具体实施方式Detailed ways
现在参考附图,详细描述本发明的具体实施方式。这里所描述的仅仅是根据本发明的优选实施方式,本领域技术人员可以在所述优选实施方式的基础上想到能够实现本发明的其他方式,所述其他方式同样落入本发明的范围。Now referring to the drawings, specific embodiments of the present invention will be described in detail. What is described here is only the preferred embodiments of the present invention, and those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiments, and the other ways also fall within the scope of the present invention.
本发明提供了一种叠瓦组件、太阳能电池片和制造该叠瓦组件的方法,图2至图12示出了本发明的若干优选实施方式。The present invention provides a shingled module, a solar cell sheet and a method of manufacturing the shingled module. Figures 2 to 12 show several preferred embodiments of the present invention.
图2示出了本发明的一个优选实施方式的叠瓦组件2。首先需要说明的是,后文将要提到的“第一方向”可以被理解为是叠瓦组件2中各个太阳能电池片的排布方向,其大致与各个矩形太阳能电池片的宽度方向一致,第一方向在图2中由D1示出;“第二方向”可以被理解为是多部段主栅线的第二部段和第三部段(将在后文详细描述)延伸的方向,第二方向在图3中由D2示出。Fig. 2 shows a shingle assembly 2 of a preferred embodiment of the present invention. First of all, it should be noted that the “first direction” mentioned later can be understood as the arrangement direction of each solar cell in the shingled assembly 2, which is roughly the same as the width direction of each rectangular solar cell. One direction is shown by D1 in Figure 2; the "second direction" can be understood as the direction in which the second and third sections of the multi-segment busbar line (which will be described in detail later) extend. The two directions are shown by D2 in FIG. 3.
叠瓦组件2包括多个太阳能电池片1,太阳能电池片1的底表面25和顶表面24的结构大致分别由图3A和图3B示出。太阳能电池片1包括基体片,基体片优选地由硅制成。基体片的表面印刷有多个栅线,栅线又包括用于集流的副栅线和用于汇流的主栅线,其中,位于基体片的顶表面上的主栅线又被称为正电极,位于基体片的底表面上的主栅线又被称为背电极,正电极和背电极优选地由银制成。The shingled assembly 2 includes a plurality of solar cell sheets 1, and the structures of the bottom surface 25 and the top surface 24 of the solar cell sheet 1 are roughly shown in FIGS. 3A and 3B, respectively. The solar cell sheet 1 includes a base sheet, and the base sheet is preferably made of silicon. A plurality of grid lines are printed on the surface of the substrate sheet. The grid lines include sub-grid lines for current collection and main grid lines for confluence. Among them, the main grid lines on the top surface of the substrate sheet are also called positive The electrode, the bus bar located on the bottom surface of the base sheet is also called the back electrode, and the positive electrode and the back electrode are preferably made of silver.
参考图3B,在本实施方式中,正电极13为多部段主栅线,多部段主栅线包括第一部段131、第三部段133和连接在第一部段131和第三部段133之间的第二部段132。第二部段132和第三部段133在基体片的顶表面24上沿一直线延伸,第二部段132和第三部段133的延伸方向被标记为是第二方向D2,第二方向D2大致垂直于第一方向D1,而第一部段131偏离第二部段132和第三部段133的延伸方向延伸,从而在第二部段132和第三部段133的延伸方向上留出空间以用于施加粘结剂。第三部段133能够直接接触与其相邻的太阳能电池片的主栅线从而实现太阳能电池片之间的导电连接。第二部段132主要用于从副栅线集流。3B, in this embodiment, the positive electrode 13 is a multi-segment bus line, the multi-segment bus line includes a first section 131, a third section 133 and connected to the first section 131 and third The second section 132 between the sections 133. The second section 132 and the third section 133 extend along a straight line on the top surface 24 of the base sheet. The extension direction of the second section 132 and the third section 133 is marked as the second direction D2, the second direction D2 is substantially perpendicular to the first direction D1, and the first section 131 extends away from the extension direction of the second section 132 and the third section 133, thereby leaving in the extension direction of the second section 132 and the third section 133. Leave space for applying adhesive. The third section 133 can directly contact the main grid lines of the solar cells adjacent to it to realize the conductive connection between the solar cells. The second section 132 is mainly used for collecting current from the secondary grid line.
图3A中所示的实施方式中,背电极12为间断设置的多段栅线结构而不为多部段主栅线,关于背电极的具体结构将在后文详细描述。In the embodiment shown in FIG. 3A, the back electrode 12 is a multi-segment gate line structure intermittently arranged instead of a multi-segment main gate line. The specific structure of the back electrode will be described in detail later.
形成为多部段主栅线的正电极13的一种实施方式在图4中示出。其中,第二部段132和第三部段133沿基体片的一个纵向边缘延伸,而第一部段131在顶表面上从该纵向边缘朝向基体片的另一纵向边缘向内凹入。为了方便描述,将第二部段132和第三部段133沿其延伸的纵向边缘称为左侧纵向边缘,将另一纵向边缘称为右侧纵向边缘,那么从左侧纵向边缘指向右侧纵向边缘的方向在图4中由D1+示出,可以理解,第一部段131便是从第二部段132和第三部段133起沿方向D1+向内凹入。这样,第一部段131便相对于第二部段132和第三部段133的延伸方向延伸,从而在第二部段132和第三部段133上为粘结剂预留出了空间。在太阳能电池片在该预留空间处施加粘结剂4的状态在图8中示出。An embodiment of the positive electrode 13 formed as a multi-segment bus line is shown in FIG. 4. The second section 132 and the third section 133 extend along one longitudinal edge of the base sheet, and the first section 131 is recessed inwardly on the top surface from the longitudinal edge toward the other longitudinal edge of the base sheet. For the convenience of description, the longitudinal edge along which the second section 132 and the third section 133 extend is called the left longitudinal edge, and the other longitudinal edge is called the right longitudinal edge, then the left longitudinal edge points to the right The direction of the longitudinal edge is shown by D1+ in FIG. 4. It can be understood that the first section 131 is concave inward along the direction D1+ from the second section 132 and the third section 133. In this way, the first section 131 extends relative to the extending direction of the second section 132 and the third section 133, thereby leaving space for the adhesive on the second section 132 and the third section 133. The state where the adhesive 4 is applied to the solar cell sheet at the reserved space is shown in FIG. 8.
进一步地,继续参考图4,第一部段131包括中心段131a和两个连接段131b,其中中心段131a平行于第二方向D2延伸,连接段131b连接在中心段131a和第二部段132之间。在本实施方式中,中心段131a和连接段131b均为直线段,但在其他未示出的实施方式中,第一部段可以为弧形段。Further, with continued reference to FIG. 4, the first section 131 includes a central section 131a and two connecting sections 131b, wherein the central section 131a extends parallel to the second direction D2, and the connecting section 131b is connected between the central section 131a and the second section 132 between. In this embodiment, the central section 131a and the connecting section 131b are both straight sections, but in other embodiments not shown, the first section may be an arc section.
另一方面,继续参考图4,第二部段132和第一部段131的宽度小于第三部段133。这样的设置是因为较窄的栅线即可有效完成汇流,而用于将电流向另一太阳能电池片导出的栅线部分则需要具有较宽的厚度,因而图4所示的实施方式既能够保证第二部段132的有效集流,又能保证第三部段133可以和另一主栅线有效导电接触。在其他未示出的实施方式中,第一部段、第二部段和第三部段可以具有相等的宽度。On the other hand, continuing to refer to FIG. 4, the widths of the second section 132 and the first section 131 are smaller than the third section 133. This arrangement is because a narrow grid line can effectively complete the confluence, and the grid line part used to lead the current to another solar cell needs to have a wider thickness, so the embodiment shown in Figure 4 can both To ensure the effective current collection of the second section 132, it can also ensure that the third section 133 can be in effective conductive contact with another main grid line. In other embodiments not shown, the first section, the second section, and the third section may have equal widths.
图5示出了形成为多部段主栅线的正电极13的另一实施方式。在该实施方式中,第一部段131和第三部段133的设置和图4中相同,但第二部段132a的宽度在自第三部段133到第一部段131的方向上渐缩,具体地,第二部段132的与第三部段133连接的一端具有与第 三部段133相等的宽度,第二部段132a的与第一部段131连接的一端具有与第一部段131相等的宽度。并且,第二部段132的内侧边缘与第三部段133的内侧边缘平齐,仅仅是第二部段132的外侧边缘朝向内侧边缘部段靠近从而形成了其渐缩的宽度。FIG. 5 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line. In this embodiment, the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 4, but the width of the second section 132a gradually increases in the direction from the third section 133 to the first section 131. Specifically, the end of the second section 132 connected to the third section 133 has the same width as the third section 133, and the end of the second section 132a connected to the first section 131 has the same width as the first section 131. The sections 131 are of equal width. In addition, the inner edge of the second section 132 is flush with the inner edge of the third section 133, except that the outer edge of the second section 132 approaches the inner edge section to form a tapered width.
图6示出了形成为多部段主栅线的正电极13的另一实施方式。在该实施方式中,第一部段131和第三部段133的设置和图5中相同,但第二部段132b的宽度在自第三部段133到第一部段131的方向上渐缩。在本实施方式中,第二部段132b的与第三部段133连接的一端具有与第三部段133相等的宽度,但与第一部段131连接的一端的宽度依然大于第一部段的宽度。并且,第二部段132b的内侧边缘与外侧边缘均朝向彼此靠近从而形成了其渐缩的宽度。FIG. 6 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line. In this embodiment, the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 5, but the width of the second section 132b gradually increases in the direction from the third section 133 to the first section 131. Shrink. In this embodiment, the end of the second section 132b connected to the third section 133 has the same width as the third section 133, but the width of the end connected to the first section 131 is still greater than that of the first section The width. In addition, the inner edge and the outer edge of the second section 132b both approach each other to form a tapered width.
上述两种设置保证了主栅线的整体的汇流的流畅性,且能够增强第二部段的强度、避免发生断裂。The above two arrangements ensure the fluency of the overall convergence of the main grid line, and can enhance the strength of the second section to avoid breakage.
图7示出了多部段主栅线的又一种实施方式。在该实施方式中,第二部段132c和第三部段133的设置大致类似于上述几个实施方式,第二方向D2为靠近基体片的一个纵向边缘的方向,而第一部段134在基体片的顶表面上从第二部段132c和第三部段133的延伸方向进一步朝向该纵向边缘凹入,第一部段134的凹入方向可以由图7中的D1-示出。这样的设置方式可以使得第一部段134在叠片后隐藏在电池交叠区域,从而使叠瓦组件外观更加美观。Fig. 7 shows yet another embodiment of a multi-segment busbar. In this embodiment, the arrangement of the second section 132c and the third section 133 is substantially similar to the above-mentioned several embodiments, the second direction D2 is a direction close to a longitudinal edge of the base sheet, and the first section 134 is The top surface of the base sheet is further recessed from the extending direction of the second section 132c and the third section 133 toward the longitudinal edge, and the recessed direction of the first section 134 can be shown by D1- in FIG. 7. Such an arrangement can make the first section 134 hidden in the battery overlap area after the lamination, thereby making the appearance of the shingle assembly more beautiful.
除了如上所述的第一部段和第二部段,多部段主栅线的第三部段也可以具有多种可选的实施方式。In addition to the first section and the second section as described above, the third section of the multi-section busbar can also have a variety of alternative implementations.
在图9所示的实施方式中,第三部段133a上设置有镂空部,且镂空部形成为三角形孔结构,且每三个三角形孔为一组沿第二方向顺次排列。在图10所示的实施方式中,第三部段133b上也设置有镂空部,镂空部形成为圆形孔结构,且每五个圆形孔为一组沿第二方向顺次排列。在图11所示的实施方式中,第三部段133为实心结构,且第三部段133平滑过渡到第二部段132。In the embodiment shown in FIG. 9, the third section 133a is provided with a hollow part, and the hollow part is formed in a triangular hole structure, and every three triangular holes are arranged in a group along the second direction. In the embodiment shown in FIG. 10, the third section 133b is also provided with a hollow part, the hollow part is formed as a circular hole structure, and every five circular holes are arranged in a group along the second direction. In the embodiment shown in FIG. 11, the third section 133 is a solid structure, and the third section 133 smoothly transitions to the second section 132.
如前文所述以及图3所示出的,太阳能电池片的背电极12可以 为间断设置的多段栅线结构,在第一方向上,多段栅线结构的各段栅线121至少与多部段主栅线的第三部段133对齐,以使得在叠瓦组件中,相邻的两个太阳能电池片的中的一个的第三部段133能够和另一个的各段栅线121相接触。并且,在第一方向上,多段栅线结构件的间隔部分122至少与多部段栅线的第一部段131对齐,以使得对于相邻的太阳能电池片,其中一个的第一部段131在第二方向上留出的空间能够和另一个的间隔部分121共同容纳粘结剂。As described above and shown in FIG. 3, the back electrode 12 of the solar cell sheet can be a multi-segment grid line structure intermittently arranged. In the first direction, each segment of the grid line 121 of the multi-segment grid line structure is at least connected to the multi-segment grid line structure. The third section 133 of the main grid line is aligned so that in the shingled assembly, the third section 133 of one of the two adjacent solar cells can be in contact with the grid lines 121 of the other. In addition, in the first direction, the spacing portion 122 of the multi-segment grid line structure is at least aligned with the first section 131 of the multi-segment grid line, so that for adjacent solar cells, the first section 131 of one of the The space left in the second direction can accommodate the adhesive together with the other spacer 121.
但是,在其他实施方式中,太阳能电池片的正电极和背电极均可设置为多部段主栅线,图12示出了相邻的两个太阳能电池片的连接结构,其中位于顶侧的太阳能电池片1的背电极12a和位于底侧的太阳能电池片1的正电极13均为多部段主栅线。在图12所示的方案中,用S1表示对应于第一部段的区域,用S2表示对应于第二部段的区域,用S3表示对应于第三部段的区域。从图中可以看到正电极13和背电极13a的第三部段相互接触,其接触表面被标记为导电接触表面23;正电极13和背电极12a的第一部段均预留出了容纳粘结剂4的空间,粘结剂4被施加在该空间中且粘结剂4的高度小于或等于两个第三部段的接合高度。However, in other embodiments, the positive electrode and the back electrode of the solar cell can be configured as a multi-segment busbar. Figure 12 shows the connection structure of two adjacent solar cells, in which the one on the top side The back electrode 12a of the solar cell 1 and the positive electrode 13 of the solar cell 1 on the bottom side are both multi-segment busbars. In the scheme shown in FIG. 12, S1 represents the area corresponding to the first section, S2 represents the area corresponding to the second section, and S3 represents the area corresponding to the third section. It can be seen from the figure that the third section of the positive electrode 13 and the back electrode 13a are in contact with each other, and the contact surface is marked as the conductive contact surface 23; the first section of the positive electrode 13 and the back electrode 12a is reserved for accommodation The space of the adhesive 4 in which the adhesive 4 is applied and the height of the adhesive 4 is less than or equal to the joining height of the two third sections.
第一部段和第三部段之间的连接部分为第二部段,从图12中可以看到两个太阳能电池片1的第二部段之间并未紧密接合而是在垂直于基体片的方向上存在间隔26,也就是说,第二部段的高度小于第三部段的高度。优选地,如图所示,第二部段的厚度在自第三部段到第一部段的方向上减缩。The connecting part between the first section and the third section is the second section. It can be seen from FIG. 12 that the second sections of the two solar cells 1 are not tightly joined but are perpendicular to the substrate. There is a gap 26 in the direction of the sheet, that is, the height of the second section is smaller than the height of the third section. Preferably, as shown in the figure, the thickness of the second section is reduced in the direction from the third section to the first section.
优选地,粘结剂可以为不具导电性的材料制成,粘结剂例如可以是丙烯酸树脂、有机硅树脂、环氧树脂、聚氨酯等,为形成一定胶厚需要在其中添加一些助剂,助剂例如为固化剂、交联剂、偶联剂或橡胶球等。Preferably, the adhesive can be made of non-conductive materials. For example, the adhesive can be acrylic resin, silicone resin, epoxy resin, polyurethane, etc. In order to form a certain adhesive thickness, some additives need to be added to it. The agent is, for example, a curing agent, a crosslinking agent, a coupling agent, or rubber balls.
在附图未示出的其他实施方式中,太阳能电池片还可以具有更多的优选设置。例如,在太阳能电池片的顶表面和底表面都设置多部段栅线的情况下,顶表面上的第三部段的长度可以大于或小于底表面上 的第三部段的长度。再例如,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,第三部段的背离基体片的面可以形成为锯齿状结构,相邻的两个太阳能电池片的彼此面对的第三部段能够以齿条啮合的形式相互接触。In other embodiments not shown in the drawings, the solar cell sheet may also have more preferred settings. For example, in the case where the top surface and the bottom surface of the solar cell sheet are provided with multi-segment grid lines, the length of the third section on the top surface may be greater than or less than the length of the third section on the bottom surface. For another example, the busbar lines on the top surface and the bottom surface of the solar cell sheet are both multi-segment busbar lines, the surface of the third section facing away from the base sheet may be formed in a zigzag structure, and two adjacent ones The third sections of the solar cells facing each other can be in contact with each other in the form of rack engagement.
本发明同时还提供了一种制造上述叠瓦组件的制造方法,其包括如下步骤:The present invention also provides a manufacturing method for manufacturing the above-mentioned shingled assembly, which includes the following steps:
制造多个太阳能电池片,所述多个太阳能电池片能够在第一方向上以叠瓦方式依次相连,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面的上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段偏离第二部段和第三部段的延伸方向延伸从而在第二部段和第三部段的延伸方向上留出空间以用于施加所述粘结剂;所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接;Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the extension direction of the second section and the third section so as to leave a space in the extension direction of the second section and the third section for applying the adhesive ; The third section can directly contact the main grid lines of the adjacent solar cells to realize the conductive connection between the solar cells;
在各个所述太阳能电池片的由所述第一部段留出的空间处施加粘结剂;Applying an adhesive to the space left by the first section of each of the solar cells;
将所述多个太阳能电池片沿所述第一方向以叠瓦方式排列、相互固定并使得任意相邻的两个太阳能电池片的彼此面对的所述主栅线的所述第三部段直接接触。The plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
进一步地,制造所述多个太阳能电池片的步骤包括:Further, the step of manufacturing the plurality of solar cell sheets includes:
对整片太阳能电池片进行预处理;Pretreatment of the entire solar cell;
将预处理之后的所述整片太阳能电池片切割成小片从而形成所述多个太阳能电池片。The whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
进一步地,所述对整片太阳能电池片进行预处理的步骤包括:Further, the step of preprocessing the entire solar cell sheet includes:
在所述整片太阳能电池片的总基体片表面上制绒;Making texturing on the surface of the total substrate sheet of the whole solar cell sheet;
在所述总基体片的正面和背面均生长沉淀一层内钝化层;An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;
在所述内钝化层上生长沉积一层中钝化层;Growing and depositing a middle passivation layer on the inner passivation layer;
在所述中钝化层上生长沉积一层外钝化层。An outer passivation layer is grown and deposited on the middle passivation layer.
进一步地,所述内钝化层采用热氧化法或笑气氧化或臭氧化或硝酸溶液化学法沉积,且内钝化层设置为二氧化硅膜层;并且/或者Further, the inner passivation layer is deposited by thermal oxidation, laughing gas oxidation, ozonation, or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or
所述中钝化层采用PECVD或ALD层或固体靶材经PVD层方法沉积,且中钝化层设置为三氧化二铝膜层或含有三氧化二铝的膜层;并且/或者The middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
所述外钝化层采用PVD、CVD或者ALD方法沉积。The outer passivation layer is deposited by PVD, CVD or ALD method.
优选地,粘结剂为不具导电性的粘结剂,且本方法不包括另外的施加导电胶的步骤。Preferably, the adhesive is a non-conductive adhesive, and the method does not include an additional step of applying conductive adhesive.
上述的各项工序,能够再具体和优化。例如,对于制绒步骤,采用单晶硅片经过表面制绒获得良好的绒面结构,从而实现增大比表面积可以接受更多光子(能量),同时减少入射光的反射,其后续可包括清洗制绒时残留的液体的步骤,以减少酸性和碱性物质对电池制结的影响。在制绒之后还可以包括制PN结的步骤,其包括:通过三氯氧磷和硅片进行反应,得到磷原子;经过一定时间,磷原子进入硅片的表面层,并且通过硅原子之间的空隙向硅片内部渗透扩散,形成了N型半导体和P型半导体的交界面。完成扩散制结工序,实现光能到电能的转换。由于扩散制结在硅片边缘形成了短路通道,PN结的正面所收集到的光生电子会沿着边缘扩散有磷的区域流到PN结的背面,而造成短路,经过等离子刻蚀将边缘PN结刻蚀去除,能够避免边缘造成短路,另外,还可以增加SE工艺步骤。并且,由于扩散制结工序会使硅片表面形成一层磷硅玻璃,通过去磷硅玻璃工序减少对叠瓦电池效率的影响。The various processes mentioned above can be more specific and optimized. For example, for the texturing step, monocrystalline silicon wafers are used for surface texturing to obtain a good textural structure, so as to increase the specific surface area and accept more photons (energy), while reducing the reflection of incident light. The subsequent steps may include cleaning The step of residual liquid during texturing to reduce the influence of acidic and alkaline substances on battery formation. After texturing, it can also include the step of making PN junction, which includes: Phosphorus oxychloride reacts with the silicon wafer to obtain phosphorus atoms; after a certain period of time, the phosphorus atoms enter the surface layer of the silicon wafer and pass between the silicon atoms. The voids infiltrate and diffuse into the silicon wafer, forming an interface between N-type semiconductor and P-type semiconductor. Complete the diffusion process and realize the conversion of light energy to electric energy. Since the diffusion junction forms a short-circuit channel at the edge of the silicon wafer, the photogenerated electrons collected on the front side of the PN junction will flow to the back side of the PN junction along the area where phosphorous is diffused at the edge, causing a short circuit. After plasma etching, the edge PN Junction etching removal can avoid short circuits caused by edges, and in addition, SE process steps can be added. In addition, since the diffusion bonding process will form a layer of phosphorous silicate on the surface of the silicon wafer, the dephosphorized silicate glass process reduces the impact on the efficiency of the shingled cell.
进一步地,在形成钝化层之后还可以对硅片进行激光开槽;在印刷电极之后进行烧结,并通过光衰炉或者电注入炉,减少电池光致衰减,最后进行电池测试分档。Further, after forming the passivation layer, the silicon wafer can be laser slotted; after printing the electrodes, sintering is performed, and the light decay furnace or electric injection furnace is used to reduce the light-induced attenuation of the battery, and finally the battery test is classified.
将硅片裂片成多个太阳能电池片的步骤优选地使用激光切割机来完成。对于烧结好的整片硅片增加在线激光切割划片工序,烧结好的整片硅片进入划片检测位进行外观检查并对OK片进行视觉定位 (外观检测不良会自动分流至NG位),根据在线生产节拍可以自由设置多轨划片机或预设缓存堆栈区,以实现在线连续进料作业。按照切割划片最优效果设定激光器相关参数,以实现较快的切割速度、较窄的切割热影响区和切割线宽、更优的均匀性以及预定的切割深度等。完成自动切割后通过在线激光划片机自动掰片机构完成切割位置处裂片实现各个太阳能电池片的自然分离。需要注意的是,激光切割面为远离PN结侧,避免PN结受损出现漏电流,需要划片上料前确认电池片正反面方向,若方向相反需增加单独的180°换向装置。The step of splitting the silicon wafer into a plurality of solar cell pieces is preferably completed using a laser cutting machine. Add online laser cutting and scribing process to the sintered whole silicon wafer. The sintered whole silicon wafer enters the scribing inspection position for appearance inspection and visual positioning of the OK wafer (the appearance inspection will be automatically shunted to the NG position), According to the online production beat, the multi-track dicing machine or the preset buffer stack area can be set freely to realize the online continuous feeding operation. Set the laser related parameters according to the optimal effect of cutting scribing to achieve faster cutting speed, narrower cutting heat affected zone and cutting line width, better uniformity and predetermined cutting depth. After the automatic cutting is completed, the automatic splitting mechanism of the online laser scribing machine completes the splits at the cutting position to realize the natural separation of each solar cell. It should be noted that the laser cutting surface is far away from the PN junction side to avoid leakage current due to damage to the PN junction. It is necessary to confirm the front and back of the cell before dicing and loading. If the direction is opposite, a separate 180° reversing device needs to be added.
最后,将各个太阳能电池片串联成叠瓦组件后,经过自动排版汇流、胶膜和背板敷设、中检、层压、修边、装框、中间位接线盒、固化、清洗、测试等环节完成叠瓦组件封装。Finally, after connecting each solar cell in series to form a shingled module, it will go through automatic typesetting and confluence, film and backplane laying, intermediate inspection, lamination, trimming, framing, intermediate junction box, curing, cleaning, testing, etc. Complete shingled assembly packaging.
本发明的太阳能电池片、叠瓦组件和制造方法,使得太阳能电池片互联成叠瓦组件时,太阳能电池片之间通过彼此间正电极和背电极的直接接触而实现导电互联,因而可以省略具有导电性的导电胶。这样,环境侵蚀、高低温交变、热胀冷缩等容易破坏导电胶因素便不会影响本发明的叠瓦组件,因而不容易出现电流虚接和断路。并且,由于不必设置导电胶,那么溢胶而造成的叠瓦组件的正负极断路等问题也就不会发生。另外,由于不要求粘结剂的导电性,叠瓦组件的生产成本也得以降低。The solar cell, shingled component and manufacturing method of the present invention enable the interconnection of the solar cells to form a shingled component, and the solar cells realize conductive interconnection through direct contact between the positive electrode and the back electrode. Conductive conductive adhesive. In this way, environmental corrosion, high and low temperature alternation, thermal expansion and contraction and other factors that easily damage the conductive adhesive will not affect the shingled component of the present invention, and therefore, current virtual connection and disconnection are unlikely to occur. In addition, since there is no need to provide conductive glue, problems such as open circuit of the positive and negative electrodes of the shingle assembly caused by overflow of glue will not occur. In addition, since the conductivity of the adhesive is not required, the production cost of the shingled assembly is also reduced.
本发明的多种实施方式的以上描述出于描述的目的提供给相关领域的一个普通技术人员。不意图将本发明排他或局限于单个公开的实施方式。如上所述,以上教导的领域中的普通技术人员将明白本发明的多种替代和变型。因此,虽然具体描述了一些替代实施方式,本领域普通技术人员将明白或相对容易地开发其他实施方式。本发明旨在包括这里描述的本发明的所有替代、改型和变型,以及落入以上描述的本发明的精神和范围内的其他实施方式。The foregoing description of the various embodiments of the present invention is provided for the purpose of description to a person of ordinary skill in the related art. It is not intended that the invention be exclusive or limited to a single disclosed embodiment. As described above, a person of ordinary skill in the field taught above will understand many alternatives and modifications of the present invention. Therefore, although some alternative embodiments are specifically described, those of ordinary skill in the art will understand or develop other embodiments with relative ease. The present invention is intended to include all alternatives, modifications and variations of the present invention described herein, as well as other embodiments falling within the spirit and scope of the present invention described above.
附图标记:Reference signs:
太阳能电池片1 Solar cell 1
叠瓦组件2 Shingled component 2
太阳能电池片的顶表面24Top surface of solar cell 24
太阳能电池片的底表面25The bottom surface of the solar cell 25
基体片11Substrate 11
正电极13 Positive electrode 13
背电极12、12a Back electrode 12, 12a
粘结剂4 Binder 4
导电接触表面23 Conductive contact surface 23
第一部段131、134The first section 131, 134
第二部段132、132a、132b、132cThe second section 132, 132a, 132b, 132c
第三部段133、133a、133bThe third section 133, 133a, 133b
两个太阳能电池片的第二部段间的间隔26Space between the second section of two solar cells 26
中心段131a Central section 131a
连接段131b Connection section 131b
第一方向D1First direction D1
第二方向D2Second direction D2

Claims (38)

  1. 一种叠瓦组件,所述叠瓦组件包括多个太阳能电池片,多个所述太阳能电池片沿第一方向以叠瓦方式依次排列并通过粘结剂相对于彼此固定,其中,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面的上各设置有一条主栅线,其特征在于,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:A shingled assembly, the shingled assembly comprising a plurality of solar cells, the plurality of solar cells are arranged in a shingled manner along a first direction and fixed relative to each other by an adhesive, wherein each The solar cell sheet includes a base sheet, a top surface and a bottom surface of the base sheet are each provided with a busbar line, characterized in that the busbar line on at least one of the top surface and the bottom surface Is a multi-section busbar line, the multi-section busbar line includes a first section, a third section, and a second section connected between the first section and the third section, among them:
    所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段偏离所述第二部段和所述第三部段延伸的方向延伸从而在所述第二部段和所述第三部段的延伸方向上留出空间以用于施加所述粘结剂;并且The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the direction in which the second section and the third section extend so as to Leave a space in the extension direction of the second section and the third section for applying the adhesive; and
    所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接。The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
  2. 根据权利要求1所述的叠瓦组件,其特征在于,所述第二部段和所述第三部段沿所述基体片的一个纵向边缘延伸,所述第一部段在其所在的表面上从所述纵向边缘朝向所述基体片的另一个纵向边缘凹入。The shingle assembly according to claim 1, wherein the second section and the third section extend along one longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is recessed from the longitudinal edge toward the other longitudinal edge of the base sheet.
  3. 根据权利要求1所述的叠瓦组件,其特征在于,所述第二部段和所述第三部段靠近所述基体片的一个纵向边缘延伸,所述第一部段在其所在的表面上从所述第二部段和所述第三部段的延伸方向进一步朝向所述纵向边缘凹入。The shingle assembly according to claim 1, wherein the second section and the third section extend close to a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is further recessed from the extending direction of the second section and the third section toward the longitudinal edge.
  4. 根据权利要求2或3所述的叠瓦组件,其特征在于,所述第一部段包括中心段和连接段,所述中心段平行于第二方向延伸,所述连接段连接所述中心段和所述第二部段,所述第二方向垂直于所述第一方向。The shingle assembly according to claim 2 or 3, wherein the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section And the second section, the second direction is perpendicular to the first direction.
  5. 根据权利要求1所述的叠瓦组件,其特征在于,所述第一部段、所述第二部段和所述第三部段的宽度相等,或者所述第一部段、所述 第二部段的宽度小于所述第三部段的宽度。The shingle assembly according to claim 1, wherein the widths of the first section, the second section and the third section are equal, or the first section and the first section The width of the second section is smaller than the width of the third section.
  6. 根据权利要求1所述的叠瓦组件,其特征在于,所述第一部段的宽度小于所述第三部段的宽度,且所述第二部段的宽度在自所述第三部段到所述第一部段的方向上渐缩。The shingle assembly according to claim 1, wherein the width of the first section is smaller than the width of the third section, and the width of the second section is greater than the width of the third section. Taper in the direction of the first section.
  7. 根据权利要求6所述的叠瓦组件,其特征在于,The shingle assembly according to claim 6, wherein:
    所述第二部段的内侧边缘与第三部段的内侧边缘平齐,所述第二部段的外侧边缘朝向内侧边缘部段靠近从而形成了渐缩的宽度;或者The inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or
    所述第二部段的内侧边缘与外侧边缘均朝向彼此逐渐靠近从而形成了渐缩的宽度。Both the inner edge and the outer edge of the second section gradually approach each other to form a tapered width.
  8. 根据权利要求1所述的叠瓦组件,其特征在于,所述第三部段的高度大于所述第二部段的高度,以使得任意一对相邻的太阳能电池片的彼此面对的所述主栅线的所述第二部段之间在垂直于所述基体片的方向上存在间隔。The shingled assembly according to claim 1, wherein the height of the third section is greater than the height of the second section, so that all pairs of adjacent solar cells face each other. There is an interval between the second sections of the busbar line in a direction perpendicular to the base sheet.
  9. 根据权利要求8所述的叠瓦组件,其特征在于,所述第二部段的厚度在自所述第三部段到所述第一部段的方向上渐缩。8. The shingle assembly according to claim 8, wherein the thickness of the second section is tapered in a direction from the third section to the first section.
  10. 根据权利要求1所述的叠瓦组件,其特征在于,所述第三部段为实心的条状结构。The shingle assembly according to claim 1, wherein the third section is a solid strip structure.
  11. 根据权利要求1所述的叠瓦组件,其特征在于,所述第三部段上设置有镂空部。The shingle assembly according to claim 1, wherein a hollow part is provided on the third section.
  12. 根据权利要求11所述的叠瓦组件,其特征在于,所述镂空部为形成在所述第三部段上的圆形孔结构或三角形孔结构。The shingle assembly according to claim 11, wherein the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
  13. 根据权利要求1所述的叠瓦组件,其特征在于,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,且位于所述太阳能电池片的顶表面上的第三部段的长度不等于位于所述太阳能电池片的底表面上的第三部段的长度。The shingled assembly according to claim 1, wherein the main grid lines on the top surface and the bottom surface of the solar cell are both multi-segment main grid lines and are located on the top surface of the solar cell. The length of the third section above is not equal to the length of the third section on the bottom surface of the solar cell sheet.
  14. 根据权利要求1所述的叠瓦组件,其特征在于,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,所述第三部段的背离所述基体片的面形成为锯齿状结构,相邻的两个所述太阳能电池片的彼此面对的所述第三部段以齿条啮合的形式相互接触。The shingled assembly according to claim 1, wherein the main grid lines on the top surface and the bottom surface of the solar cell are both multi-segment main grid lines, and the third section is away from the The surface of the base sheet is formed in a zigzag structure, and the third sections facing each other of the two adjacent solar cell sheets are in contact with each other in the form of rack meshing.
  15. 根据权利要求1所述的叠瓦组件,其特征在于,每一对相邻的所述太阳能电池片的相接触的所述第三部段的接合高度大于或等于所述粘结剂的高度。The shingle assembly according to claim 1, wherein the joint height of the third section of each pair of adjacent solar cells is greater than or equal to the height of the adhesive.
  16. 根据权利要求1所述的叠瓦组件,其特征在于,每一个所述太阳能电池片的所述顶表面和所述底表面中的一个上的主栅线为多部段主栅线,另一个上的主栅线为间断设置的多段栅线结构,其中,在所述第一方向上,所述多段栅线结构至少与所述多部段主栅线的所述第三部段对齐,所述多段栅线结构间的间隔部分至少与所述多部段栅线的所述第一部段对齐。The shingled assembly according to claim 1, wherein the busbar line on one of the top surface and the bottom surface of each solar cell sheet is a multi-segment busbar line, and the other The upper bus line is a multi-section gate line structure intermittently arranged, wherein, in the first direction, the multi-section gate line structure is at least aligned with the third section of the multi-section bus line, so The spacing part between the multi-segment gate line structure is at least aligned with the first section of the multi-segment gate line.
  17. 根据权利要求1所述的叠瓦组件,其特征在于,所述粘结剂不具导电性。The shingle assembly of claim 1, wherein the adhesive is not electrically conductive.
  18. 一种太阳能电池片,多个所述太阳能电池片能够在第一方向上以叠瓦方式依次排列并通过粘结剂相对于彼此固定,其特征在于,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:A solar cell sheet, wherein a plurality of the solar cell sheets can be arranged in a shingled manner in a first direction and fixed with respect to each other by an adhesive, wherein each solar cell sheet includes a base sheet, The top surface and the bottom surface of the base sheet are each provided with a busbar line, and the busbar line on at least one of the top surface and the bottom surface is a multi-segment busbar line. The main grid line includes a first section, a third section and a second section connected between the first section and the third section, wherein:
    所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段偏离所述第二部段和所述第三部段的延伸的方向延伸从而在所述第二部段和第三部段的延伸方向上留出空间以用于施加所述粘结剂;并且The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the extending direction of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and
    所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连接。The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
  19. 根据权利要求18所述的太阳能电池片,其特征在于,所述第二部段和所述第三部段沿所述基体片的一个纵向边缘延伸,所述第一部段在其所在的表面上从所述纵向边缘朝向所述基体片的另一个纵向边缘凹入。The solar cell sheet according to claim 18, wherein the second section and the third section extend along a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is recessed from the longitudinal edge toward the other longitudinal edge of the base sheet.
  20. 根据权利要求18所述的太阳能电池片,其特征在于,所述第二部段和所述第三部段靠近所述基体片的一个纵向边缘延伸,所述第 一部段在其所在的表面上从所述第二部段和所述第三部段的延伸方向进一步朝向所述纵向边缘凹入。The solar cell sheet according to claim 18, wherein the second section and the third section extend close to a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is further recessed from the extending direction of the second section and the third section toward the longitudinal edge.
  21. 根据权利要求18或19所述的太阳能电池片,其特征在于,所述第一部段包括中心段和连接段,所述中心段平行于第二方向延伸,所述连接段连接所述中心段和所述第二部段,所述第二方向垂直于所述第一方向。The solar cell according to claim 18 or 19, wherein the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section And the second section, the second direction is perpendicular to the first direction.
  22. 根据权利要求18所述的太阳能电池片,其特征在于,所述第一部段、所述第二部段和所述第三部段的宽度相等,或者所述第一部段、所述第二部段的宽度小于所述第三部段的宽度。The solar cell sheet according to claim 18, wherein the widths of the first section, the second section and the third section are equal, or the first section and the first section The width of the second section is smaller than the width of the third section.
  23. 根据权利要求18所述的太阳能电池片,其特征在于,所述第一部段的宽度小于所述第三部段的宽度,且所述第二部段的宽度在自所述第一部段到所述第三部段的方向上渐缩。The solar cell sheet of claim 18, wherein the width of the first section is smaller than the width of the third section, and the width of the second section is greater than the width of the first section. Taper in the direction of the third section.
  24. 根据权利要求23所述的太阳能电池片,其特征在于,The solar cell sheet according to claim 23, wherein:
    所述第二部段的内侧边缘与第三部段的内侧边缘平齐,所述第二部段的外侧边缘朝向内侧边缘部段靠近从而形成了渐缩的宽度;或者The inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or
    所述第二部段的内侧边缘与外侧边缘均朝向彼此逐渐靠近从而形成了其渐缩的宽度。The inner and outer edges of the second section are gradually approaching each other to form a tapered width.
  25. 根据权利要求18所述的太阳能电池片,其特征在于,所述第三部段的高度大于所述第二部段的高度,以使得任意一对相邻的太阳能电池片的彼此面对的所述主栅线的所述第二部段之间在垂直于所述基体片的方向上存在间隔。The solar cell according to claim 18, wherein the height of the third section is greater than the height of the second section, so that all pairs of adjacent solar cells face each other. There is an interval between the second sections of the busbar line in a direction perpendicular to the base sheet.
  26. 根据权利要求25所述的太阳能电池片,其特征在于,所述第二部段的厚度在自所述第三部段到所述第一部段的方向上渐缩。The solar cell sheet according to claim 25, wherein the thickness of the second section is tapered in a direction from the third section to the first section.
  27. 根据权利要求18所述的太阳能电池片,其特征在于,所述第三部段为实心的条状结构。The solar cell sheet of claim 18, wherein the third section is a solid strip structure.
  28. 根据权利要求18所述的太阳能电池片,其特征在于,所述第三部段上设置有镂空部。The solar cell sheet according to claim 18, wherein a hollow portion is provided on the third section.
  29. 根据权利要求28所述的太阳能电池片,其特征在于,所述镂空部为形成在所述第三部段上的圆形孔结构或三角形孔结构。The solar cell sheet according to claim 28, wherein the hollow portion is a circular hole structure or a triangular hole structure formed on the third section.
  30. 根据权利要求18所述的太阳能电池片,其特征在于,所述太阳能电池片的顶表面和底表面上的主栅线均为多部段主栅线,且位于所述太阳能电池片的顶表面上的第三部段的长度不等于位于所述太阳能电池片的底表面上的第三部段的长度。The solar cell according to claim 18, wherein the busbars on the top surface and the bottom surface of the solar cell are both multi-segment busbars, and are located on the top surface of the solar cell The length of the third section above is not equal to the length of the third section on the bottom surface of the solar cell sheet.
  31. 根据权利要求18所述的太阳能电池片,其特征在于,所述第三部段的背离所述基体片的面形成为锯齿状结构,以使得相邻的两个所述太阳能电池片的彼此面对的所述主栅线的所述第三部段以齿条啮合的形式相互接触。The solar cell sheet according to claim 18, wherein the surface of the third section facing away from the base sheet is formed in a zigzag structure, so that two adjacent solar cell sheets face each other The third sections of the pair of the bus bars are in contact with each other in the form of rack engagement.
  32. 根据权利要求18所述的太阳能电池片,其特征在于,所述主栅线的厚度构造为使得每一对相邻的所述太阳能电池片的相接触的所述第三部段的接合高度大于或等于所述粘结剂的高度。The solar cell sheet according to claim 18, wherein the thickness of the main grid line is configured such that the joint height of the third section of each pair of adjacent solar cell sheets is greater than Or equal to the height of the adhesive.
  33. 根据权利要求18所述的太阳能电池片,其特征在于,所述顶表面和所述底表面中的一个上的主栅线为多部段主栅线,另一个上的主栅线为间断设置的多段栅线结构,其中,在所述第一方向上,所述多段栅线结构至少与所述多部段主栅线的所述第三部段对齐,所述多段栅线结构间的间隔部分至少与所述多部段栅线的所述第一部段对齐。The solar cell according to claim 18, wherein the busbar on one of the top surface and the bottom surface is a multi-segment busbar, and the busbar on the other is intermittently arranged The multi-segment gate line structure, wherein, in the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure The portion is at least aligned with the first section of the multi-section grid line.
  34. 一种制造根据权利要求1-17中任意一项所述的叠瓦组件的制造方法,其特征在于,所述制造方法包括如下步骤:A manufacturing method for manufacturing the shingled assembly according to any one of claims 1-17, wherein the manufacturing method comprises the following steps:
    制造多个太阳能电池片,所述多个太阳能电池片能够在第一方向上以叠瓦方式依次相连,每个所述太阳能电池片包括基体片,所述基体片的顶表面和底表面的上各设置有一条主栅线,所述顶表面和所述底表面中的至少一个上的主栅线为多部段主栅线,所述多部段主栅线包括第一部段、第三部段和连接在所述第一部段和所述第三部段之间的第二部段,其中:所述第二部段和所述第三部段在其所在的表面上沿一直线延伸,而所述第一部段偏离所述第二部段和所述第三部段延伸的方向延伸从而在所述第二部段和所述第三部段的延伸方向上留出空间以用于施加所述粘结剂;所述第三部段能够直接接触与其相邻的太阳能电池片的主栅线从而实现所述太阳能电池片之间的导电连 接;Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the direction in which the second section and the third section extend so as to leave a space in the direction in which the second section and the third section extend. Used to apply the adhesive; the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells;
    在各个所述太阳能电池片的由所述第一部段留出的空间处施加粘结剂;Applying an adhesive to the space left by the first section of each of the solar cells;
    将所述多个太阳能电池片沿所述第一方向以叠瓦方式排列、相互固定并使得任意相邻的两个太阳能电池片的彼此面对的所述主栅线的所述第三部段直接接触。The plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
  35. 根据权利要求34所述的方法,其特征在于,制造所述多个太阳能电池片的步骤包括:The method of claim 34, wherein the step of manufacturing the plurality of solar cells comprises:
    对整片太阳能电池片进行预处理;Pretreatment of the entire solar cell;
    将预处理之后的所述整片太阳能电池片切割成小片从而形成所述多个太阳能电池片。The whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
  36. 根据权利要求35所述的方法,其特征在于,所述对整片太阳能电池片进行预处理的步骤包括:The method according to claim 35, wherein the step of preprocessing the entire solar cell sheet comprises:
    在所述整片太阳能电池片的总基体片表面上制绒;Making texturing on the surface of the total substrate sheet of the whole solar cell sheet;
    在所述总基体片的正面和背面均生长沉淀一层内钝化层;An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;
    在所述内钝化层上生长沉积一层中钝化层;Growing and depositing a middle passivation layer on the inner passivation layer;
    在所述中钝化层上生长沉积一层外钝化层。An outer passivation layer is grown and deposited on the middle passivation layer.
  37. 根据权利要求36所述的制造方法,其特征在于,The manufacturing method according to claim 36, wherein:
    所述内钝化层采用热氧化法或笑气氧化或臭氧化或硝酸溶液化学法沉积,且内钝化层设置为二氧化硅膜层;并且/或者The inner passivation layer is deposited by thermal oxidation or laughing gas oxidation or ozonation or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or
    所述中钝化层采用PECVD或ALD层或固体靶材经PVD层方法沉积,且中钝化层设置为三氧化二铝膜层或含有三氧化二铝的膜层;并且/或者The middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or
    所述外钝化层采用PVD、CVD或者ALD方法沉积。The outer passivation layer is deposited by PVD, CVD or ALD method.
  38. 根据34-37中任意一项所述的方法,其特征在于,所述方法不包括施加导电胶的步骤。The method according to any one of 34-37, wherein the method does not include the step of applying conductive glue.
PCT/CN2020/118178 2020-01-23 2020-09-27 Shingled assembly, solar cell pieces, and manufacturing method for shingled assembly WO2021013275A2 (en)

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