CN112117338A - Solar cell, laminated tile assembly and manufacturing method - Google Patents
Solar cell, laminated tile assembly and manufacturing method Download PDFInfo
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- CN112117338A CN112117338A CN202011120744.9A CN202011120744A CN112117338A CN 112117338 A CN112117338 A CN 112117338A CN 202011120744 A CN202011120744 A CN 202011120744A CN 112117338 A CN112117338 A CN 112117338A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/043—Mechanically stacked PV cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/547—Monocrystalline silicon PV cells
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a solar cell, a laminated tile assembly and a manufacturing method. The solar cell sheet comprises a substrate sheet, top surface grid lines arranged on the top surface of the substrate sheet, and bottom surface grid lines arranged on the bottom surface of the substrate sheet, wherein the extending directions of the top surface grid lines and the bottom surface grid lines on the substrate sheet are set to enable the bottom surface grid lines of a first solar cell sheet of the two solar cell sheets and the top surface grid lines of a second solar cell sheet of the two solar cell sheets to be in cross contact to realize electric connection when the two solar cell sheets are connected in a tiling mode. The whole silver paste consumption of the grid line of the solar cell piece can be less than that of the grid line of the common solar cell piece, and the requirement of the interconnection reliability of the front electrode and the back electrode can still be met.
Description
Technical Field
The invention relates to the field of energy, in particular to a solar cell, a laminated tile assembly and a manufacturing method.
Background
With the increasing consumption of conventional fossil energy such as global coal, oil, natural gas and the like, the ecological environment is continuously deteriorated, and particularly, the sustainable development of the human society is seriously threatened due to the increasingly severe global climate change caused by the emission of greenhouse gases. Various countries in the world make respective energy development strategies to deal with the limitation of conventional fossil energy resources and the environmental problems caused by development and utilization. Solar energy has become one of the most important renewable energy sources by virtue of the characteristics of reliability, safety, universality, long service life, environmental protection and resource sufficiency, and is expected to become a main pillar of global power supply in the future.
In a new energy revolution process, the photovoltaic industry in China has grown into a strategic emerging industry with international competitive advantages. However, the development of the photovoltaic industry still faces many problems and challenges, and the conversion efficiency and reliability are the biggest technical obstacles restricting the development of the photovoltaic industry, while the cost control and the scale-up are economically restricted. The photovoltaic module is taken as a core component of photovoltaic power generation, and the development of high-efficiency modules by improving the conversion efficiency of the photovoltaic module is a necessary trend. Various high efficiency modules, such as shingles, half-sheets, multi-master grids, double-sided modules, etc., are currently emerging on the market. With the application places and application areas of the photovoltaic module becoming more and more extensive, the reliability requirement of the photovoltaic module becomes higher and higher, and particularly, the photovoltaic module with high efficiency and high reliability needs to be adopted in some severe or extreme weather frequent areas.
Under the background of vigorous popularization and use of green solar energy, the power loss of the laminated assembly is greatly reduced by utilizing a low-current low-loss electrical principle (the power loss of a photovoltaic assembly is in a direct proportional relation with the square of working current), and the laminated assembly is higher in energy density per unit area by fully utilizing the inter-cell spacing of a battery assembly to lay more batteries for power generation. In addition, the conductive adhesive is used for replacing a conventional photovoltaic welding strip for the assembly, the photovoltaic welding strip shows higher series resistance in the whole battery, and the resistance of a circuit formed by the conductive adhesive is far smaller than that of a welding strip. Meanwhile, structural interconnection between super-flexible sheets can be realized under a model using conductive adhesive, so that the breakage of the manufacturing process and the use link can be effectively reduced. Compared with a conventional photovoltaic module, the conversion efficiency of the laminated assembly is higher, and the risk of fragment of the interconnected position of the cut battery and the battery is smaller.
The existing solar cell and the existing tile-stacked assembly have some defects. For example, the main grid lines of the conventional solar cell are usually of a simple linear design, which results in high unit consumption of the front and back of the cell, increased production cost and reduced competitiveness.
It is therefore desirable to provide a solar cell, a shingle assembly, and a method of manufacture that at least partially address the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a solar cell, a laminated tile assembly and a manufacturing method. In the invention, because the adjacent solar cells in the laminated assembly do not need to realize conductive connection through electrodes which are arranged in an overlapping mode and contacted in a large area, the whole silver paste consumption of the grid lines of the solar cells can be smaller than that of the grid lines of the common solar cells, and the requirement of the interconnection reliability of the front and back electrodes can still be met. Therefore, the solar cell provided by the invention can reduce the loss of the top surface main grid line, reduce the production cost and improve the technical competitiveness.
Moreover, the solar cell provided by the invention can have various different grid line structures and combinations. Therefore, the solar cell provided by the invention can reduce the loss of the grid line and meet various use requirements of users.
According to a first aspect of the present invention, a solar cell sheet is provided, the solar cell sheet comprises a base sheet, a top surface grid line disposed on a top surface of the base sheet, and a bottom surface grid line disposed on a bottom surface of the base sheet, wherein the extending directions of the top surface grid line and the bottom surface grid line on the base sheet are set such that when two solar cell sheets are connected in a shingled manner, the bottom surface grid line of a first solar cell sheet of the two solar cell sheets and the top surface grid line of a second solar cell sheet of the two solar cell sheets are in cross contact to achieve electrical connection.
In one embodiment, the top surface grid lines and the bottom surface grid lines extend on the substrate sheet in a direction such that when two solar cell sheets are connected in a shingled manner, the bottom surface grid lines of a first solar cell sheet and the top surface grid lines of a second solar cell sheet in contact with each other have an included angle of 5 ° to 175 °.
In one embodiment, the top surface grid lines comprise top surface minor grid lines and top surface main grid lines arranged to cross the top surface minor grid lines, the bottom surface grid lines only comprise bottom surface minor grid lines, and the solar cell slices are configured such that when two solar cell slices are connected in a tiling manner, the bottom surface minor grid lines of a first solar cell slice and the top surface main grid lines of a second solar cell slice which are in contact with each other are in cross contact to realize electrical connection; or
The top surface grid lines only comprise top surface secondary grid lines, the bottom surface grid lines comprise bottom surface secondary grid lines and bottom surface main grid lines arranged to intersect with the bottom surface secondary grid lines, and the solar cell slices are constructed so that when two solar cell slices are connected in a tiling mode, the bottom surface main grid lines of a first solar cell slice and the top surface secondary grid lines of a second solar cell slice which are in contact with each other are in intersecting contact to realize electric connection.
In one embodiment, the top surface gridlines comprise top surface gridlines and top surface gridlines disposed intersecting the top surface gridlines, the bottom surface gridlines comprise bottom surface gridlines and bottom surface gridlines disposed intersecting the bottom surface gridlines, and the solar cell slices are configured such that when two solar cell slices are connected in a shingled manner: the bottom surface main grid lines of the first solar cell slice and the top surface secondary grid lines of the second solar cell slice which are contacted with each other are in cross contact to realize electric connection, or the bottom surface secondary grid lines of the first solar cell slice and the top surface main grid lines of the second solar cell slice which are contacted with each other are in cross contact to realize electric connection.
In one embodiment, the top surface grid lines include top surface grid minor lines and top surface main grid lines arranged to cross the top surface grid minor lines, the bottom surface grid lines include bottom surface grid minor lines and bottom surface main grid lines arranged to cross the bottom surface grid minor lines, and the top surface grid major lines and the bottom surface main grid major lines are arranged in such a direction that the bottom surface main grid lines of the first solar cell sheet and the top surface main grid lines of the second solar cell sheet, which are in contact with each other when the two solar cell sheets are connected in a shingled manner, are in cross contact to achieve electrical connection.
In one embodiment, the solar cell sheet is provided with a top surface and/or a bottom surface with a secondary grid line and a main grid line crossing the secondary grid line, the main grid line comprises at least two grid line structures parallel to each other, and the solar cell sheet is configured such that the main grid line of one solar cell sheet and the main grid line or the secondary grid line of another solar cell sheet are in cross contact when the two solar cell sheets are connected in a shingled manner.
In one embodiment, the base sheet has a first longitudinal edge, a second longitudinal edge, and two transverse edges;
the top surface grid lines comprise top surface main grid lines, the whole top surface main grid lines are arranged on the top surface of the base sheet along or close to the first longitudinal edge of the base sheet, the top surface main grid lines comprise top surface first main grid lines and top surface second main grid lines, the top surface first main grid lines and the top surface second main grid lines extend along the longitudinal direction of the base sheet, and intervals exist between the top surface first main grid lines and the top surface second main grid lines in the transverse direction of the base sheet;
the bottom surface grid lines comprise bottom surface main grid lines, the bottom surface main grid lines are integrally arranged on the bottom surface of the base sheet along or close to the second longitudinal edge of the base sheet,
wherein the top surface bus bars and the bottom surface bus bars are configured such that the bottom surface bus bars of a first solar cell sheet can simultaneously contact the top surface first bus bars and the top surface second bus bars of a second solar cell sheet when the two solar cell sheets are connected in a shingled manner.
In one embodiment, the bottom surface busbar includes a bottom surface first busbar and a plurality of bottom surface second busbars, the bottom surface first busbar extending in a longitudinal direction of the substrate sheet; the second main grid lines on the bottom surface are in short strip-shaped structures extending along the transverse direction of the base piece, and each second main grid line on the bottom surface intersects with the first main grid line on the bottom surface.
In one embodiment, a space exists between the first bottom surface busbar and the second longitudinal edge of the base sheet, one end of each second bottom surface busbar extends to the second longitudinal edge of the base sheet, and the other end of each second bottom surface busbar extends to the first bottom surface busbar or protrudes beyond the first bottom surface busbar.
In one embodiment, a plurality of connection portions are arranged in a space between the top surface first bus bar and the top surface second bus bar.
In one embodiment, the positions of the top surface busbar and the bottom surface busbar on the respective surfaces are set to: when two solar cells are connected in a tiling mode, the second main grid line on the bottom surface of each first solar cell is in contact with the first main grid line on the top surface and the second main grid line on the top surface of each second solar cell.
In one embodiment, the positions of the top surface busbar and the bottom surface busbar on the respective surfaces are set to: so that when two solar cells are connected in a shingled manner, the second bus bars on each bottom surface of the first solar cell are in contact with only the second bus bars on the top surface of the second solar cell.
In one embodiment, a top surface busbar for current collection is provided on the top surface of the substrate sheet, the top surface busbar and the top surface busbar being in conductive contact.
In one embodiment, the solar cell sheet is a bifacial solar cell sheet, the bottom surface of the substrate sheet is provided with bottom surface busbar lines for current collection, and the bottom surface busbar lines are in conductive contact.
According to another aspect of the invention, a laminated assembly is provided, wherein the laminated assembly comprises at least one cell string, and each cell string is formed by arranging the solar cells according to any one of the above schemes in a laminated manner.
In one embodiment, the solar cell sheet in the string of cells includes top and bottom surface bus bars, and
each pair of adjacent solar cells is a first solar cell and a second solar cell, the top surface main grid line of the first solar cell is in conductive contact with the bottom surface main grid line of the second solar cell, the first solar cell and the second solar cell are fixed together through an adhesive, the adhesive is positioned between the first top surface main grid line and the second bottom surface main grid line of the first solar cell, and the adhesive bypasses the bottom surface main grid line of the second solar cell.
According to still another aspect of the present invention, there is provided a method for manufacturing a solar cell sheet according to any one of the above aspects, the method comprising a step of manufacturing a cell sheet and a step of splitting the cell sheet into a plurality of solar cell sheets, the step of manufacturing the cell sheet comprising the steps of:
arranging a large substrate sheet, wherein the large substrate sheet comprises a plurality of substrate sheet units which are connected together, and after the large cell sheet is split, each substrate sheet unit forms a substrate sheet of the solar cell sheet;
printing top surface grid lines on the top surface of the base sheet large sheet, and printing bottom surface grid lines on the bottom surface of the base sheet large sheet, wherein the printing directions of the top surface grid lines and the bottom surface grid lines are such that when two solar cell sheets are arranged in a tiling mode, the bottom surface grid lines of a first solar cell sheet in the two solar cell sheets and the top surface grid lines of a second solar cell sheet in the two solar cell sheets are in cross contact to realize electric connection.
In one embodiment, the method includes the step of providing a PN junction, and the PN junction is provided such that the PN junction is positioned to bypass the boundary line between the base sheet units.
In one embodiment, the step of manufacturing the battery piece large sheet further comprises a sintering step after printing the grid lines.
According to a fourth aspect of the present invention there is provided a method of manufacturing a shingle assembly, the method comprising:
manufacturing a solar cell piece according to the method in any one of the above aspects;
arranging a plurality of solar cells into a cell string in a tiling mode;
and fixedly forming at least one battery string into a laminated tile assembly.
Drawings
For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals in the drawings refer to like parts. It will be appreciated by persons skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention without any limiting effect on the scope of the invention, and that the various components in the drawings are not drawn to scale.
Fig. 1 shows a schematic top surface view of a solar cell sheet according to a preferred embodiment of the present invention;
fig. 2 shows a partially enlarged view of a portion a in fig. 1;
FIG. 3 shows a schematic bottom surface view of the solar cell sheet of FIG. 1;
fig. 4 is a partially enlarged view of a portion D in fig. 3;
fig. 5 is a portion of a cross-sectional view taken along line B-B of fig. 2 and showing another solar cell sheet connected to the solar cell sheet of fig. 2 in a shingled manner;
fig. 6 is a portion of a cross-sectional view taken along line C-C of fig. 2 and showing another solar cell sheet connected to the solar cell sheet of fig. 2 in a shingled manner;
fig. 7 is a schematic bottom surface view of a solar cell sheet according to a second preferred embodiment of the present invention;
fig. 8A and 8B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a third preferred embodiment of the present invention;
fig. 9A and 9B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a fourth preferred embodiment of the present invention;
fig. 10A and 10B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a fifth preferred embodiment of the present invention;
fig. 11A and 11B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a sixth preferred embodiment of the present invention;
fig. 12A and 12B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a seventh preferred embodiment of the present invention;
fig. 13A and 13B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to an eighth preferred embodiment of the present invention;
fig. 14A and 14B are schematic top and bottom surfaces, respectively, of a solar cell sheet according to a ninth preferred embodiment of the present invention;
fig. 15A and 15B are schematic top and bottom surfaces of a solar cell sheet according to a tenth preferred embodiment of the present invention, respectively.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. What has been described herein is merely a preferred embodiment in accordance with the present invention and other ways of practicing the invention will occur to those skilled in the art and are within the scope of the invention.
In the present invention, a solar cell, a stack of tiles and a method of manufacturing are provided, and fig. 1-15B show a partial structure according to some preferred embodiments of the present invention.
Referring first to fig. 1 to 3, in a first preferred embodiment of the present invention, a solar cell sheet 1 includes a base sheet 11, the base sheet 11 having two lateral edges extending in a lateral direction D1 and a first longitudinal edge 15 and a second longitudinal edge 16 extending in a longitudinal direction D2. The top surface of the base sheet 11 is provided with a plurality of finger lines 13, and the plurality of finger lines 13 extend in the transverse direction D1 and are arranged in the longitudinal direction D2. The top surface of the base sheet 11 is also provided with top surface bus bars 12 extending along or near the first longitudinal edge 15 of the base sheet 11, the top surface bus bars 12 contacting the finger lines 13 on all top surfaces to act as current sinks for the finger lines 13.
Fig. 2 shows a partial enlarged view of a portion a in fig. 1, and as shown in fig. 2, the top surface bus bar 12 includes a top surface first bus bar 121 and a top surface second bus bar 122, the top surface first bus bar 121 and the top surface second bus bar 122 are parallel to each other and have a space therebetween in a transverse direction D1, a plurality of connection portions 123 are arranged along a longitudinal direction D2 within the space, and each connection portion 123 is capable of electrically connecting the top surface first bus bar 121 and the top surface second bus bar 122. The respective connection portions 123 are preferably arranged at equal intervals, or at unequal intervals as shown in fig. 1. The connecting portion 123 may be a point-shaped or strip-shaped connecting portion.
The bottom surface of the base sheet 11 is provided with bottom surface bus bars that extend entirely along or near the second longitudinal edge 16 of the base sheet 11. After two solar cells 1 are adjacently arranged in a tiling manner, the bottom surface main grid line of one solar cell 1 can simultaneously contact the top surface first main grid line 121 and the top surface second main grid line 122 of the other solar cell to realize the conductive connection between the two solar cells 1.
Preferably, referring to fig. 3 and 4, the bottom surface main gate line 14 in this embodiment includes a bottom surface first main gate line 141 and a bottom surface second main gate line 142, the bottom surface first main gate line 141 extends along the longitudinal direction D2, the bottom surface second main gate line 142 is plural and arranged along the longitudinal direction D2, each bottom surface second main gate line 142 is a short stripe structure extending along the transverse direction D1, and each bottom surface second main gate line 142 intersects with the bottom surface first main gate line 141.
Further, with continued reference to fig. 3 and 4, there is a gap between the bottom surface first bus bar 141 and the second longitudinal edge 16 of the base sheet 11, and one end of each bottom surface second bus bar 142 extends to the second longitudinal edge 16 of the base sheet 11 and the other end extends to a position protruding beyond the bottom surface first bus bar 141.
Cross-sectional views of two solar cells 1 as shown in fig. 1-4 after being connected in a shingled manner are shown in fig. 5 and 6. Fig. 5 is a sectional view taken along line B-B of fig. 2, and fig. 6 is a sectional view taken along line C-C of fig. 2, and both sectional views show another solar cell sheet 1a connected to the solar cell sheet 1 of fig. 2 in a shingled manner. The bottom surface busbar 14 of the other solar cell sheet 1a contacts the top surface busbar 12 of the solar cell sheet 1 in fig. 2. The solar cell sheet 1 and the other solar cell sheet 1a in fig. 5 and 6 have the same structure, and are respectively given different numbers for the sake of convenience of distinction.
Referring to fig. 5, the first bus bar 141 of the bottom surface of the another solar cell sheet 1a contacts each of the connection parts 123 of the solar cell sheet 1 shown in fig. 2. Also, referring to fig. 6, each bottom surface second bus bar 142 of the another solar cell sheet 1a contacts both the top surface first bus bar 121 and the top surface second bus bar 122 of the solar cell sheet 1 shown in fig. 2. However, in other embodiments, which are not shown, each bottom surface second major.
It can be seen that the structure of the top surface main gate line 12 and the bottom surface main gate line 14 of the solar cell 1 provided by the embodiment is different from the traditional main gate line structure, and the main gate line structure provided by the embodiment can reduce the amount of silver paste on the basis of realizing the adjacent solar cell 1, so as to reduce the unit consumption of the top surface main gate line 12 and the bottom surface main gate line 14.
When adjacent solar cells 1 are interconnected in a shingled manner, they may be secured to each other by an adhesive, which may be applied at the top surface gap locations 124 as shown in fig. 2 and the bottom surface gap locations 143 as shown in fig. 4. In other words, the adhesive is positioned between the top surface first bus bar 121 and the bottom surface second bus bar 142 of the first solar cell sheet 1, and the adhesive bypasses the connection part 123 and the bottom surface bus bar 14 of the second solar cell sheet 1.
In the present embodiment, the bottom surface of the base sheet 11 is provided with not the sub-grid lines but the back electric field. In other embodiments, not shown, the bottom surface of the base sheet 11 may also be provided with a secondary grid line, so that the solar cell sheet 1 may be used as a bifacial solar cell sheet 1. When the bottom surface of the base sheet 11 is also provided with minor grid lines, the minor grid lines on the bottom surface may be aligned with the extending direction of the second major grid lines 142 on the bottom surface. Further, the bottom surface second bus bar 142 may coincide with and form part of the bottom surface finger.
The present embodiment also provides a laminated assembly, which may be formed by a plurality of solar cells 1 as shown in fig. 1-4 interconnected in a laminated manner, and a cross-sectional view of an overlapping position of any two adjacent solar cells 1 in the laminated assembly may be, for example, as shown in fig. 5 and 6.
Fig. 7 shows a schematic bottom surface view of a solar cell sheet 2 according to a second embodiment of the present invention. The bottom surface of the base sheet 21 of the solar cell sheet 2 is provided with a bottom surface busbar 24, and the bottom surface busbar 24 includes a bottom surface first busbar 241 and a plurality of bottom surface second busbar 242. In this embodiment, one end of the second bottom surface main grid line 242 extends to the second longitudinal edge 26 of the solar cell, and the other end extends to the first bottom surface main grid line 241 without protruding from the first bottom surface main grid line 241.
The present embodiment also provides a plurality of solar cell sheets formed by the solar cell sheets 2 shown in fig. 7 interconnected in a shingled manner, and when two solar cell sheets 2 shown in fig. 7 are interconnected in a shingled manner, the bottom surface second major grid lines 242 of one of the solar cell sheets 2 may contact only the top surface first major grid lines of the other solar cell sheet 2, or only the top surface second major grid lines of the other solar cell sheet 2.
It can be seen that, in the above embodiment, when adjacent solar cells are connected in a shingled manner, the main grid lines in corresponding contact form an angle of 90 ° with each other. For example, the first main grid line 121 on the top surface of the first solar cell piece 1 and the second main grid line 142 on the bottom surface of the second solar cell piece 1a are in cross contact, and the included angle between the two lines is 90 °; the second main grid line 122 on the top surface of the first solar cell piece 1 and the second main grid line 142 on the bottom surface of the second solar cell piece 1a are in cross contact, and the included angle between the two lines is 90 °.
In other preferred embodiments of the present invention, structures different from those of the above-described embodiments may be provided. For example, in one embodiment, a solar cell sheet includes a substrate sheet, top surface gridlines (including at least one of top surface gridlines, top surface subgrids) disposed on a top surface of the substrate sheet, and bottom surface gridlines (including at least one of bottom surface gridlines, bottom surface subgrids) disposed on a bottom surface of the substrate sheet. Wherein, the extending directions of the top surface grid lines and the bottom surface grid lines on the substrate sheet are set to enable the bottom surface grid lines of the first solar cell sheet of the two solar cell sheets and the top surface grid lines of the second solar cell sheet of the two solar cell sheets to be in cross contact to realize electrical connection when the two solar cell sheets are connected in a tiling mode. Preferably, the included angle between the grid lines on the bottom surface of the first solar cell piece and the grid lines on the top surface of the second solar cell piece, which are in contact with each other, is 5-175 degrees, and the included angle is optimally 90 degrees.
Fig. 8A-15B illustrate other embodiments of solar cell sheets that enable cross-contact of top and bottom surface gridlines of adjacent solar cell sheets that face each other at an angle of 5 ° -175 °, preferably 90 °.
Referring to fig. 8A and 8B, fig. 8A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 8B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 8A, the top surface of the solar cell sheet 3 is provided with top surface minor grid lines 33 extending in the transverse direction D1 and top surface major grid lines 32 extending in the longitudinal direction D2 and intersecting each of the top surface minor grid lines 33; referring to fig. 8B, the bottom surface of the solar cell sheet 3 is provided with only the bottom surface minor grid lines 37 extending in the transverse direction D1 and is not provided with the bottom surface major grid lines. When two solar cell sheets 3 as shown in fig. 8A-8B are interconnected in a shingled manner, the bottom surface minor grid lines 37 of a first solar cell sheet can cross-contact (specifically, vertically cross-contact) with the top surface major grid lines 32 of a second solar cell sheet to achieve electrical connection.
Referring to fig. 9A and 9B, fig. 9A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 9B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 9A, only the top surface minor grid lines 43 extending in the transverse direction D1 are disposed on the top surface of the solar cell sheet 4, and the top surface major grid lines are not disposed; referring to fig. 9B, the bottom surface of the solar cell sheet 4 is provided with bottom surface minor grid lines 47 extending in the transverse direction D1 and bottom surface major grid lines 44 extending in the longitudinal direction D2 and contacting each bottom surface minor grid line 47. When two solar cell sheets as shown in fig. 9A-9B are interconnected in a shingled manner, the bottom surface major grid lines 44 of a first solar cell sheet can cross-contact (specifically, vertically cross-contact) with the top surface minor grid lines 43 of a second solar cell sheet to achieve electrical connection.
Referring to fig. 10A and 10B, fig. 10A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 10B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 10A, the top surface of the solar cell sheet 5 is provided with top surface minor grid lines 53 extending in the transverse direction D1 and top surface major grid lines 52 extending in the longitudinal direction D2 and intersecting each of the top surface minor grid lines 53; referring to fig. 10B, the bottom surface of the solar cell sheet 5 is provided with bottom surface minor grid lines 57 extending in the transverse direction D1 and bottom surface major grid lines 54 extending in the longitudinal direction D2 and contacting each bottom surface minor grid line 57. When two solar cell sheets 5 as shown in fig. 10A-10B are interconnected in a shingled manner, the bottom surface major grid lines 54 of the first solar cell sheet and the top surface minor grid lines 53 of the second solar cell sheet that are in contact with each other are cross-contacted to achieve electrical connection, or the bottom surface minor grid lines 57 of the first solar cell sheet and the top surface major grid lines 52 of the second solar cell sheet are cross-contacted to achieve electrical connection.
Referring to fig. 11A and 11B, fig. 11A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 11B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 11A, the top surface of the solar cell sheet 6 is provided with top surface minor grid lines 63 extending in the transverse direction D1 and top surface major grid lines 62 extending in the longitudinal direction D2 and intersecting each of the top surface minor grid lines 63, the top surface major grid lines 62 being formed in a two-line parallel grid line structure; referring to fig. 11B, the bottom surface of the solar cell sheet 6 is provided with only the bottom surface minor grid lines 67 extending in the transverse direction D1 and is not provided with the bottom surface major grid lines. When two solar cell sheets 3 as shown in fig. 11A-8B are interconnected in a shingled manner, the bottom surface minor grid lines 67 of the first solar cell sheet can cross-contact (specifically, vertically cross-contact) the two grid line structures of the top surface major grid lines 62 of the second solar cell sheet to achieve electrical connection.
Referring to fig. 12A and 12B, fig. 12A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 12B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 12A, only the top surface minor grid lines 73 extending in the transverse direction D1 are disposed on the top surface of the solar cell sheet 7 without the top surface major grid lines; referring to fig. 12B, the bottom surface of the solar cell sheet 7 is provided with bottom surface minor grid lines 77 extending in the transverse direction D1 and bottom surface major grid lines 74 extending in the longitudinal direction D2 and contacting each bottom surface minor grid line 77, the bottom surface major grid lines 74 being two grid line structures parallel to each other. When two solar cell sheets as shown in fig. 12A-12B are interconnected in a shingled manner, the two grid line structures (or only one of the two grid line structures) of the bottom surface major grid line 74 of the first solar cell sheet can be cross-contacted (specifically, vertically cross-contacted) with the top surface minor grid line 73 of the second solar cell sheet to achieve electrical connection.
Referring to fig. 13A and 13B, fig. 13A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 13B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 13A, a top surface minor grid line 83 extending along a transverse direction D1 and a top surface major grid line 82 extending along a longitudinal direction D2 and intersecting each top surface minor grid line 83 are disposed on the top surface of the solar cell sheet 8, the top surface major grid line 82 is a two-grid-line structure parallel to each other; referring to fig. 9B, the bottom surface of the solar cell sheet 8 is provided with bottom surface minor grid lines 87 extending in the transverse direction D1 and bottom surface major grid lines 84 extending in the longitudinal direction D2 and contacting each bottom surface minor grid line 87. When two solar cell sheets 8 as shown in fig. 13A-13B are interconnected in a shingled manner, the bottom surface major grid lines 84 of the first solar cell sheet and the top surface minor grid lines 83 of the second solar cell sheet that are in contact with each other cross-contact to achieve electrical connection, or the bottom surface minor grid lines 87 of the first solar cell sheet and the top surface major grid lines 82 of the second solar cell sheet cross-contact to achieve electrical connection in two grid line structures (or only one of the two grid line structures).
Referring to fig. 14A and 14B, fig. 14A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 14B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 14A, the top surface of the solar cell sheet 9 is provided with top surface minor grid lines 93 extending in the transverse direction D1 and top surface major grid lines 92 extending in the longitudinal direction D2 and intersecting each of the top surface minor grid lines 93; referring to fig. 9B, the bottom surface of the solar cell sheet 9 is provided with bottom surface minor grid lines 97 extending in the transverse direction D1 and bottom surface major grid lines 94 extending in the longitudinal direction D2 and contacting each bottom surface minor grid line 97, the bottom surface major grid lines 94 being two grid line structures parallel to each other. When two solar cell sheets 9 as shown in fig. 14A-14B are interconnected in a shingled manner, the bottom surface major grid lines 94 of the first solar cell sheet and the top surface minor grid lines 93 of the second solar cell sheet that are in contact with each other cross-contact to achieve electrical connection, or the bottom surface minor grid lines 97 of the first solar cell sheet and the top surface major grid lines 92 of the second solar cell sheet (or only one of the two grid line structures) cross-contact to achieve electrical connection.
Referring to fig. 15A and 15B, fig. 15A is a schematic top surface view of a solar cell sheet according to an embodiment, and fig. 15B is a schematic bottom surface view of the solar cell sheet rotated by 180 ° around a horizontal axis at a longitudinal center position of the solar cell sheet. Referring to fig. 15A, a top surface finger line 103 extending in a transverse direction D1 and a top surface finger line 102 extending in a longitudinal direction D2 and intersecting each top surface finger line 103 are disposed on a top surface of the solar cell sheet 10, the top surface finger line 102 being a two-line structure parallel to each other; referring to fig. 9B, the bottom surface of the solar cell sheet 10 is provided with bottom surface minor grid lines 107 extending along the transverse direction D1 and bottom surface major grid lines 104 extending along the longitudinal direction D2 and contacting each bottom surface minor grid line 107, and the bottom surface major grid lines 104 are two grid line structures parallel to each other. When two solar cell sheets 10 as shown in fig. 15A-15B are interconnected in a shingled manner, two grid line structures (or only one of the two grid line structures) of the bottom surface main grid line 104 of the first solar cell sheet and the top surface sub-grid line 103 of the second solar cell sheet that are in contact with each other are in cross contact to achieve electrical connection, or two grid line structures (or only one of the two grid line structures) of the bottom surface sub-grid line 107 of the first solar cell sheet and the top surface main grid line 102 of the second solar cell sheet are in cross contact to achieve electrical connection.
Embodiments provided herein also include a method of manufacturing a solar cell sheet, such as in fig. 1-15B, and a method of manufacturing a stack assembly, which may include a method of manufacturing a solar cell sheet.
The method for manufacturing the laminated assembly mainly comprises the following steps: arranging a large substrate sheet; printing a grid line on a large substrate sheet; an intermediate treatment step; splitting a large cell into a plurality of solar cells; and (5) carrying out subsequent processing steps.
Wherein each step may have a variety of preferred settings. For example, the step of providing a larger sheet of substrate may comprise: and arranging the substrate sheet large sheet, wherein the substrate sheet large sheet comprises a plurality of substrate sheet units which are connected together, and after the cell large sheet is split, each substrate sheet unit forms a substrate sheet of the solar cell sheet, and each substrate sheet unit has two longitudinal edges and two transverse edges. The step of providing a larger sheet of substrate may further comprise the steps of: arranging a monocrystalline silicon wafer; preparing wool and cleaning residual liquid during wool preparation; introducing phosphorus oxychloride to form a PN junction on the surface of the monocrystalline silicon wafer; etching and removing phosphorosilicate glass; high temperature oxidation to form silicon dioxide layers on the top and bottom surfaces of the single crystal silicon wafer; forming an aluminum oxide film on the surface of the silicon dioxide layer; forming a silicon nitride film on the surface of the aluminum oxide film, thereby generating a large substrate sheet; and laser grooving is carried out on the bottom surface of the large substrate sheet.
Preferably, the PN junction is provided such that the position of the PN junction is around the boundary line between the base sheet units. The step of manufacturing the battery plate big piece also comprises a sintering step after printing the grid lines. The method also comprises the following steps before splitting: and confirming whether the front and back surfaces of the large battery piece are preset surfaces or not, and if the front and back surfaces are the preset surfaces, controlling the mechanical arm to turn over the large battery piece by the control mechanism.
Wherein the step of printing the gate line comprises: printing top surface grid lines on the top surface of the base sheet large sheet, and printing bottom surface grid lines on the bottom surface of the base sheet large sheet, wherein the printing directions of the top surface grid lines and the bottom surface grid lines are such that when two solar cell sheets are arranged in a tiling mode, the bottom surface grid lines of a first solar cell sheet in the two solar cell sheets and the top surface grid lines of a second solar cell sheet in the two solar cell sheets are in cross contact to realize electric connection.
Intermediate processing steps may include, for example, sintering, passing through a light decay oven or an electrical injection oven, reducing cell light decay, test grading, etc.
Subsequent processing steps after the solar cell is split may include: arranging all solar cells into cell strings in a tiling mode, assembling the cell strings, automatically typesetting and converging the strings, laying an adhesive film and a back plate, detecting, laminating, trimming, framing, connecting a middle junction box, curing, cleaning, testing and the like to finish packaging of a tiling assembly.
The various steps described above may be further expanded. For example, in a complete manufacturing process, the following steps may be included:
a single crystal silicon wafer is adopted to obtain a good suede structure through surface texturing, so that the specific surface area is increased, more photons (energy) can be received, and the reflection of incident light is reduced;
the residual liquid during the texturing is cleaned, so that the influence of acidic and alkaline substances on the battery knot making is reduced;
phosphorus oxychloride reacts with the silicon wafer to obtain phosphorus atoms. After a certain time, phosphorus atoms enter the surface layer of the silicon wafer and permeate and diffuse into the silicon wafer through gaps among the silicon atoms to form an interface of the N-type semiconductor and the P-type semiconductor;
because the diffusion junction forms a short circuit channel at the edge of the silicon wafer, photogenerated electrons collected by the front surface of the PN junction flow to the back surface of the PN junction along the region with phosphorus atoms diffused at the edge, and the short circuit is caused. Etching and removing PN junctions at the edge through plasma etching, so as to avoid short circuit at the edge;
the diffusion junction making process can form a layer of phosphorosilicate glass on the surface of the silicon wafer, and the influence on the efficiency of the laminated tile battery is reduced through the phosphorosilicate glass removing process;
etching the silicon wafer without the phosphorosilicate glass, and then producing a silicon dioxide layer on the front and rear surfaces of the battery piece through an oxygen high-temperature furnace at a certain temperature;
then, laminating an aluminum oxide passivation film layer in an ALD (atomic layer deposition) or PECVD (plasma enhanced chemical vapor deposition) mode;
a silicon nitride film is laminated on the aluminum oxide film layer, the silicon nitride on the front surface plays a role in reducing reflection and passivating, and the silicon nitride film on the rear surface plays a role in protecting aluminum oxide;
laser grooving is carried out on the back of the coated silicon wafer;
the back and front sides are printed by screen printing, the small front and back electrodes are required to be in staggered positions after the printed patterns are cut, and then the sintering process is carried out
By using a light attenuation furnace or an electric injection furnace, the light attenuation of the battery cell is reduced
And finally, grading the battery test.
Adding an online laser cutting scribing process to the whole sintered laminated cell, entering the sintered laminated cell into a scribing detection position for appearance inspection and visually positioning an OK sheet (poor appearance detection can automatically shunt to an NG position), and freely setting a multi-track scribing machine or presetting a cache stack area according to an online production beat so as to realize online continuous feeding operation. And setting relevant parameters of the laser according to the optimal effect of cutting and scribing so as to realize higher cutting speed, narrower cutting heat affected zone and cutting line width, better uniformity, preset cutting depth and the like. After the automatic cutting is finished, the automatic sheet breaking mechanism of the online laser scribing machine is used for breaking sheets at the cutting position to realize natural separation of the small laminated tiles (the laser cutting surface is far away from the side of a PN junction to avoid leakage current caused by damage of the PN junction, the directions of the front surface and the back surface of the battery sheet are confirmed before the sheet is scribed and fed, and if the directions are opposite, a single 180-degree reversing device is required to be added);
then, carrying out interconnection and string combination on the small pieces;
and after the string is formed, the packaging of the laminated photovoltaic module is completed through the links of automatic string typesetting and converging, adhesive film and back plate laying, middle detection, laminating, trimming, framing, middle junction box curing, cleaning, testing and the like.
Since the step of fabricating the bulk of the substrate may have the step of providing a PN junction, a tunnel junction or a heterojunction, the printed gate line may also have a preferred arrangement in relation to the PN junction, the tunnel junction or the heterojunction. For example, the first secondary grid line burns through a PN junction, a tunneling junction or a passivation structure layer on the surface of a heterojunction of the substrate sheet and forms conductive contact with the PN junction, the tunneling junction or the heterojunction; and/or the second auxiliary grid line burns through the passivation structure layer on the surface of the PN junction, the tunneling junction or the heterojunction of the substrate sheet and forms conductive contact with the PN junction, the tunneling junction or the heterojunction; and/or the bus bars disposed on the top surface of the substrate sheet burn through PN junctions, tunneling junctions, or PN junctions of the heterojunction substrate sheet. For another example, the first secondary grid line does not burn through a PN junction, a tunneling junction or a passivation structure layer on the surface of the heterojunction of the substrate sheet; and/or the second auxiliary grid line does not burn through a passivation structure layer on the surface of a PN junction, a tunneling junction or a heterojunction of the substrate sheet; and/or the main grid line arranged on the top surface of the substrate sheet does not burn through the passivation structure layer on the surface of the PN junction, the tunneling junction or the heterojunction.
According to the scheme provided by the invention, the whole silver paste consumption of the grid lines can be less than that of the grid lines of the common solar cell, and the requirement on the interconnection reliability of the front electrode and the back electrode can still be met. Therefore, the solar cell provided by the invention can reduce the loss of the grid line, reduce the production cost and improve the technical competitiveness.
In addition, the grid lines on the top surface and the grid lines on the bottom surface of the solar cell provided by the invention can be combined in various structures, so that the solar cell provided by the invention can meet various use requirements of users on the premise of further reducing the loss of the grid lines.
The foregoing description of various embodiments of the invention is provided for the purpose of illustration to one of ordinary skill in the relevant art. It is not intended that the invention be limited to a single disclosed embodiment. As mentioned above, many alternatives and modifications of the present invention will be apparent to those skilled in the art of the above teachings. Thus, while some alternative embodiments are specifically described, other embodiments will be apparent to, or relatively easily developed by, those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications and variances of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention as described above.
Claims (20)
1. A solar cell sheet is characterized by comprising a substrate sheet, top surface grid lines arranged on the top surface of the substrate sheet, and bottom surface grid lines arranged on the bottom surface of the substrate sheet, wherein the extending directions of the top surface grid lines and the bottom surface grid lines on the substrate sheet are set to enable the bottom surface grid lines of a first solar cell sheet in the two solar cell sheets and the top surface grid lines of a second solar cell sheet in the two solar cell sheets to be in cross contact to realize electric connection when the two solar cell sheets are connected in a tiling mode.
2. The solar cell sheet according to claim 1, wherein the top and bottom surface grid lines extend in a direction on the base sheet such that when two solar cell sheets are connected in a shingled manner, the bottom surface grid line of a first solar cell sheet and the top surface grid line of a second solar cell sheet in contact with each other have an angle of 5 ° to 175 °.
3. Solar cell sheet according to claim 2,
the top surface grid lines comprise top surface secondary grid lines and top surface main grid lines arranged in a crossed mode between the top surface secondary grid lines, the bottom surface grid lines only comprise bottom surface secondary grid lines, and the solar cell slices are constructed in a mode that when two solar cell slices are connected in a tiling mode, the bottom surface secondary grid lines of the first solar cell slice and the top surface main grid lines of the second solar cell slice which are in contact with each other are in crossed contact to achieve electric connection; or
The top surface grid lines only comprise top surface secondary grid lines, the bottom surface grid lines comprise bottom surface secondary grid lines and bottom surface main grid lines arranged to intersect with the bottom surface secondary grid lines, and the solar cell slices are constructed so that when two solar cell slices are connected in a tiling mode, the bottom surface main grid lines of a first solar cell slice and the top surface secondary grid lines of a second solar cell slice which are in contact with each other are in intersecting contact to realize electric connection.
4. The solar cell sheet of claim 2, wherein the top surface gridlines comprise top surface gridlines and top surface gridlines disposed intersecting the top surface gridlines, and the bottom surface gridlines comprise bottom surface gridlines and bottom surface gridlines disposed intersecting the bottom surface gridlines, the solar cell sheet being configured such that when two solar cell sheets are connected in a shingled manner: the bottom surface main grid lines of the first solar cell slice and the top surface secondary grid lines of the second solar cell slice which are contacted with each other are in cross contact to realize electric connection, or the bottom surface secondary grid lines of the first solar cell slice and the top surface main grid lines of the second solar cell slice which are contacted with each other are in cross contact to realize electric connection.
5. The solar cell sheet according to claim 2, wherein the top surface grid lines comprise top surface minor grid lines and top surface major grid lines arranged to cross the top surface minor grid lines, the bottom surface grid lines comprise bottom surface minor grid lines and bottom surface major grid lines arranged to cross the bottom surface minor grid lines, and the top surface major grid lines and the bottom surface major grid lines extend in directions such that the bottom surface major grid lines of a first solar cell sheet and the top surface major grid lines of a second solar cell sheet contacting each other cross each other to achieve electrical connection when the two solar cell sheets are connected in a shingled manner.
6. The solar cell sheet according to claim 2, wherein the solar cell sheet is provided with a top surface and/or a bottom surface with a plurality of sub-grid lines and a plurality of main grid lines crossing the sub-grid lines, the main grid lines including at least two grid line structures parallel to each other, the solar cell sheet being configured such that the main grid lines of one solar cell sheet cross the main grid lines or the sub-grid lines of another solar cell sheet when the two solar cell sheets are connected in a shingled manner.
7. The solar cell sheet of claim 2, wherein the substrate sheet has a first longitudinal edge, a second longitudinal edge, and two lateral edges;
the top surface grid lines comprise top surface main grid lines, the whole top surface main grid lines are arranged on the top surface of the base sheet along or close to the first longitudinal edge of the base sheet, the top surface main grid lines comprise top surface first main grid lines and top surface second main grid lines, the top surface first main grid lines and the top surface second main grid lines extend along the longitudinal direction of the base sheet, and intervals exist between the top surface first main grid lines and the top surface second main grid lines in the transverse direction of the base sheet;
the bottom surface grid lines comprise bottom surface main grid lines, the bottom surface main grid lines are integrally arranged on the bottom surface of the base sheet along or close to the second longitudinal edge of the base sheet,
wherein the top surface bus bars and the bottom surface bus bars are configured such that the bottom surface bus bars of a first solar cell sheet can simultaneously contact the top surface first bus bars and the top surface second bus bars of a second solar cell sheet when the two solar cell sheets are connected in a shingled manner.
8. The solar cell sheet of claim 7, wherein the bottom surface busbar comprises a bottom surface first busbar and a plurality of bottom surface second busbar, the bottom surface first busbar extending in a longitudinal direction of the substrate sheet; the second main grid lines on the bottom surface are in short strip-shaped structures extending along the transverse direction of the base piece, and each second main grid line on the bottom surface intersects with the first main grid line on the bottom surface.
9. The solar cell sheet of claim 8, wherein a space exists between the first bottom surface busbar and the second longitudinal edge of the substrate sheet, one end of each second bottom surface busbar extends to the second longitudinal edge of the substrate sheet, and the other end of each second bottom surface busbar extends to or protrudes beyond the first bottom surface busbar.
10. The solar cell sheet of claim 7, wherein a plurality of connection portions are arranged in spaces between the top surface first bus bar lines and the top surface second bus bar lines.
11. The solar cell sheet of claim 10, wherein the top surface busbar lines and the bottom surface busbar lines are positioned on the respective surfaces at locations set to: when two solar cells are connected in a tiling mode, the second main grid line on the bottom surface of each first solar cell is in contact with the first main grid line on the top surface and the second main grid line on the top surface of each second solar cell.
12. The solar cell sheet of claim 10, wherein the top surface busbar lines and the bottom surface busbar lines are positioned on the respective surfaces at locations set to: so that when two solar cells are connected in a shingled manner, the second bus bars on each bottom surface of the first solar cell are in contact with only the second bus bars on the top surface of the second solar cell.
13. The solar cell sheet of claim 7, wherein the top surface of the substrate sheet has top surface gridlines disposed thereon for current collection, the top surface gridlines and the top surface gridlines being in conductive contact.
14. The solar cell sheet according to claim 13, wherein the solar cell sheet is a bifacial solar cell sheet, the bottom surface of the substrate sheet is provided with bottom surface busbar lines for current collection, and the bottom surface busbar lines are in conductive contact.
15. A shingle assembly comprising at least one string of cells, each string of cells comprising solar cells according to any of claims 1-14 arranged in a shingled manner.
16. The shingle assembly of claim 15, wherein the solar cells in the string include top and bottom surface bus bars, and
each pair of adjacent solar cells is a first solar cell and a second solar cell, the top surface main grid line of the first solar cell is in conductive contact with the bottom surface main grid line of the second solar cell, the first solar cell and the second solar cell are fixed together through an adhesive, the adhesive is positioned between the first top surface main grid line and the second bottom surface main grid line of the first solar cell, and the adhesive bypasses the bottom surface main grid line of the second solar cell.
17. A method for manufacturing a solar cell according to any one of claims 1 to 14, wherein the method comprises a step of manufacturing a cell wafer and a step of splitting the cell wafer into a plurality of solar cells, and the step of manufacturing the cell wafer comprises the steps of:
arranging a large substrate sheet, wherein the large substrate sheet comprises a plurality of substrate sheet units which are connected together, and after the large cell sheet is split, each substrate sheet unit forms a substrate sheet of the solar cell sheet;
printing top surface grid lines on the top surface of the base sheet large sheet, and printing bottom surface grid lines on the bottom surface of the base sheet large sheet, wherein the printing directions of the top surface grid lines and the bottom surface grid lines are such that when two solar cell sheets are arranged in a tiling mode, the bottom surface grid lines of a first solar cell sheet in the two solar cell sheets and the top surface grid lines of a second solar cell sheet in the two solar cell sheets are in cross contact to realize electric connection.
18. The method according to claim 17, wherein the method comprises the step of providing a PN junction, and the PN junction is provided such that the PN junction is positioned so as to circumvent a boundary line between the base sheet units.
19. The method of claim 17, wherein the step of fabricating the battery wafer further comprises a sintering step after printing the grid lines.
20. A method of manufacturing a shingle assembly, the method comprising:
manufacturing a solar cell sheet according to the method of any one of claims 18-19;
arranging a plurality of solar cells into a cell string in a tiling mode;
and fixedly forming at least one battery string into a laminated tile assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120744.9A CN112117338A (en) | 2020-10-19 | 2020-10-19 | Solar cell, laminated tile assembly and manufacturing method |
Applications Claiming Priority (1)
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