CN113078226A - Main-grid-free solar cell, cell module, and preparation method and application of cell module - Google Patents
Main-grid-free solar cell, cell module, and preparation method and application of cell module Download PDFInfo
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- CN113078226A CN113078226A CN202110383209.0A CN202110383209A CN113078226A CN 113078226 A CN113078226 A CN 113078226A CN 202110383209 A CN202110383209 A CN 202110383209A CN 113078226 A CN113078226 A CN 113078226A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F77/00—Constructional details of devices covered by this subclass
- H10F77/20—Electrodes
- H10F77/206—Electrodes for devices having potential barriers
- H10F77/211—Electrodes for devices having potential barriers for photovoltaic cells
- H10F77/219—Arrangements for electrodes of back-contact photovoltaic cells
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
- H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
- H10F19/906—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells characterised by the materials of the structures
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
- H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
- H10F19/908—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells for back-contact photovoltaic cells
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F71/00—Manufacture or treatment of devices covered by this subclass
- H10F71/137—Batch treatment of the devices
- H10F71/1375—Apparatus for automatic interconnection of photovoltaic 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a main grid-free solar cell, a cell assembly, a preparation method and an application thereof. According to the invention, the electrode pattern is only printed with the thin grid lines at the battery end, and the main grid lines are eliminated; and meanwhile, the component end is connected with a tinned metal wire serving as a main grid through a tin paste bonding pad, so that the tinned metal wire and a thin grid line of the solar cell are well combined to collect and transmit current. In the invention, because a plurality of tin-plated metal wires are added as the main grid lines, the carrier transport path is shortened to reduce the series resistance, and the series resistance loss is reduced; and the shielding of the grid lines to sunlight is reduced by canceling the main grid lines, so that the photoproduction current is increased, and the photoelectric conversion efficiency is improved.
Description
Technical Field
The invention relates to the field of solar cells, in particular to a solar cell without a main grid, a cell module, a preparation method and application thereof.
Background
The electrode of the solar cell is formed by screen printing conductive silver paste on a silicon substrate and forming ohmic contact with the silicon substrate through high-temperature sintering. The electrode is mainly composed of a main grid line and a thin grid line. The solar cell is classified into a conventional solar cell having a main grid line and a solar cell without a main grid according to the presence or absence of the main grid. When the traditional solar cell containing the main grid lines, such as 3BB, 4BB and 5BB solar cells, is welded, a copper welding strip coated with a tin-lead alloy is pulled out through a series welding machine, and the copper welding strip is welded on the positive and negative main grid lines of adjacent cell pieces so as to realize series connection among the plurality of cell pieces. The automatic series welding operation has the advantages of simplicity, rapidness and high efficiency. However, such conventional solar cells with main grids, such as N-type heterojunction and Topcon high-efficiency solar cells, require double-sided printing of silver paste, and thus the manufacturing cost of the cells is high. And the weight of the printed main grid silver paste accounts for half of the printing weight of the whole electrode, so that the unit consumption of the battery is high.
Therefore, in order to reduce the cost, reduce the amount of noble metal used and increase the light receiving area of the front surface of the cell, various solar cells without a main grid exist. The solar cell without the main grid is characterized in that only fine grid line electrodes are printed, and the main grid lines are omitted, so that the light receiving area of the front face of the cell is increased, the short-circuit current and the cell power of the cell are improved, and the use amount of the grid line printing silver paste is reduced to reduce the production cost and the cell unit consumption.
The solar cell without the main grid line cannot be welded by using a traditional welding strip and a traditional welding mode because the solar cell without the main grid line does not have the main grid line. Therefore, the solar cell without the main grid needs to adopt a new welding mode. One of the existing welding methods for a solar cell without a main grid is a packaging method in which copper wires are embedded into an organic film, i.e., a copper wire composite film is formed by using plated copper wires and the organic film and is laid on the front and back surfaces of the solar cell to realize the serial connection of adjacent cells, and after the batteries after serial connection are arranged and laminated, the tinned copper wires and the thin grid wires of the solar cell are pressed together by a laminating machine at a certain laminating temperature and pressure. The method not only needs a special manufacturing process to fuse the copper wire and the organic film together, but also is mainly applied to the heterojunction solar cell, and the technology relates to the patents of foreign companies, and is inconvenient to use at home and high in cost.
Based on the above situation, a new structure convenient for welding needs to be designed for the solar cell without the main grid, so that the solar cell without the main grid can have the manufacturing simplicity and high efficiency of the traditional cell, and can break through other technical limitations, thereby meeting the market demands for reducing the manufacturing cost of the solar cell without the main grid, reducing the technical cost and improving the manufacturing efficiency of the solar cell without the main grid.
Disclosure of Invention
The invention aims to: the solar cell without the main grid, the cell module, the preparation method and the application of the solar cell are provided, and the technical problems that the existing solar cell without the main grid is complex in manufacturing process, low in efficiency, high in manufacturing cost, high in technical cost and the like are solved.
The technical scheme adopted by the invention is as follows:
the utility model provides a no main grid solar cell, includes the battery piece that does not have the main grid and a plurality of each other non-intersecting and with the crossing tin-plating wire of each thin grid line in the front of battery piece, distribute a plurality of tin cream pads on the thin grid line in the front of battery piece, tin-plating wire will be provided with each thin grid line of tin cream pad through the tin cream pad and will be connected in series on thin grid line arrangement direction.
Furthermore, a plurality of back electrodes of the battery piece are arranged in a matrix, the back surface of the battery piece is provided with tinned metal wires, the number of the tinned metal wires is consistent with the number of columns of the matrix arrangement and the tinned metal wires do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same column in series.
Furthermore, the quantity of the tin-plated metal wires on the back surface of the battery piece is consistent with that on the front surface of the battery piece
Further, the tinned metal wire is a tinned copper wire.
Further, the orthographic projection of the solder paste welding disc on the battery piece is on a fine grid line positioned right below the battery piece.
Furthermore, the solder paste bonding pad is printed on the fine grid line by adopting an SMT steel mesh.
The utility model provides a battery pack, includes the front layer material, packaging material, solar cell layer, packaging material and the back layer material that from top to bottom connects, solar cell layer includes the solar cell that a plurality of was arranged in proper order, solar cell includes the battery piece that does not have the main grid and a plurality of each other mutually nonintersecting and with the crossing tin-plated wire of each thin grid line in the front of battery piece, it has a plurality of tin cream pads to distribute on the positive thin grid line of battery piece, tin-plated wire will be provided with each thin grid line of tin cream pad and arrange the direction electricity series connection in thin grid line through the tin cream pad, in two adjacent solar cells, the positive tin-plated wire of a solar cell is connected with the main grid electricity at another solar cell back, realizes positive negative pole and positive pole and establishes ties.
Further, in two adjacent solar cells, the tinned metal wire on the front surface of one solar cell is electrically connected with the main grid on the back surface of the other solar cell through the bus bar.
A preparation method of a solar cell without a main grid comprises the following steps:
s1, printing a battery piece without a main grid, wherein only a thin grid line is arranged on an electrode of the battery piece;
s2, printing a solder paste disc on the fine grid line;
s3, enabling the plurality of tinned metal wires to be opposite to the tin paste disc, enabling the tinned metal wires not to be intersected with each other and to be crossed with the thin grid lines, and enabling the tinned metal wires to electrically connect the thin grid lines provided with the tin paste pads in series in the arrangement direction of the thin grid lines through the tin paste pads;
s4, heating the battery piece obtained in the step S3 to enable the tin-plated metal wire and the fine grid line to be welded through a solder paste welding pad;
s5, arranging tinned metal wires on the back of the cell piece, wherein the tinned metal wires are consistent with the longitudinal rows of the matrix arrangement of the back electrodes in number and do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same longitudinal row in series;
and S6, heating the battery piece obtained in the S5 to weld the tin-plated metal wire with the back electrode.
A preparation method of a solar cell module without a main grid comprises the following steps:
s1, printing a battery piece without a main grid, wherein only a thin grid line is arranged on an electrode of the battery piece;
s2, printing a solder paste disc on the fine grid line;
s3, enabling the plurality of tinned metal wires to be opposite to the tin paste disc, enabling the tinned metal wires not to be intersected with each other and to be crossed with the thin grid lines, and enabling the tinned metal wires to electrically connect the thin grid lines provided with the tin paste pads in series in the arrangement direction of the thin grid lines through the tin paste pads;
s4, heating the battery piece obtained in the step S3 to enable the tin-plated metal wire and the fine grid line to be welded through a solder paste welding pad;
s5, arranging tinned metal wires on the back of the cell piece, wherein the tinned metal wires are consistent with the longitudinal rows of the matrix arrangement of the back electrodes in number and do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same longitudinal row in series;
s6, heating the battery piece obtained in the step S5 to enable the tin-plated metal wire to be welded with the back electrode;
s7, connecting a plurality of battery slices obtained in the step S6 in series;
and S8, packaging according to the conventional solar cell module packaging method.
The invention discloses an application of a solar cell without a main grid designed by the invention in converting solar energy into electric energy.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention relates to a solar cell without a main grid, a cell assembly, a preparation method and application thereof.A thin grid line is only printed on the end of a cell by an electrode pattern, and the main grid line is eliminated; and meanwhile, the component end is connected with a tinned metal wire serving as a main grid through a tin paste bonding pad, so that the tinned metal wire and a thin grid line of the solar cell are well combined to collect and transmit current. In the invention, because a plurality of tin-plated metal wires are added as the main grid lines, the carrier transport path is shortened to reduce the series resistance, and the series resistance loss is reduced; and the shielding of the grid lines to sunlight is reduced by canceling the main grid lines, so that the photoproduction current is increased, and the photoelectric conversion efficiency is improved.
2. The invention relates to a solar cell without a main grid, a cell module, a preparation method and application thereof.A tin paste bonding pad and a metal wire with tin plated on the outer surface are adopted, so that the metal wire serving as the main grid can be conveniently and quickly and stably and electrically connected with a fine grid line, the solar cell without the main grid has the manufacturing simplicity and high efficiency of the traditional cell, other technical limitations can be broken through, and the market requirements on reducing the manufacturing cost of the solar cell without the main grid, reducing the technical cost and improving the manufacturing efficiency of the solar cell without the main grid are met;
3. according to the solar cell without the main grid, the battery assembly and the preparation method and application thereof, the tin-plated metal wire and the thin grid line are fused by using the tin paste bonding pad, so that the interconnection welding of the solar cell without the main grid is realized, the design of the solar cell without the main grid or multiple thin main grids is realized, the series resistance and the grid line shielding area of the battery sheet are greatly reduced, the electrical loss of a welding strip and the shielding area of the welding strip are correspondingly reduced after the assembly is welded, and the purposes of reducing the silver paste consumption of the battery sheet and improving the output power of the assembly are achieved; the scheme is simple, and the mature solder paste printing technology in the electronic industry is used, so that the reliability is high.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment will be briefly described below, and it should be understood that the proportional relationship of each component in the drawings in this specification does not represent the proportional relationship in the actual material selection design, and is only a schematic diagram of the structure or the position, in which:
FIG. 1 is a schematic front view of a cell without a primary grid;
FIG. 2 is a schematic view of the solder pad of FIG. 1 provided with solder paste;
fig. 3 is a back side schematic view of a cell sheet not provided with a primary grid;
FIG. 4 is a schematic diagram of the alignment Mark point setting for a non-main grid cell;
FIG. 5 is a schematic front view of a cell with tin-plated wires soldered thereto;
fig. 6 is a schematic back view of a cell sheet with tin-plated wires soldered thereto;
FIG. 7 is a schematic view of tin-plated wire alignment and IR welding;
fig. 8 is a schematic view of the copper wire mesh and bus bar welding.
Reference numerals in the drawings indicate:
the method comprises the following steps of 1-battery piece, 2-fine grid lines, 3-tinned metal wires, 4-bus bars, 5-back electrodes, 6-solder paste welding pads and 7-Mark points.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention will be described in detail with reference to fig. 1 to 8.
Example 1
As shown in fig. 1 to 5, the solar cell without the main grid comprises a cell 1 without the main grid and a plurality of upper and tin-plated metal wires 3 which are mutually non-intersected and are intersected with each thin grid line 2 on the front surface of the cell 1, wherein a plurality of tin paste pads 6 are distributed on the thin grid lines 2 on the front surface of the cell 1, and the tin-plated metal wires 3 electrically connect the thin grid lines 2 provided with the tin paste pads 6 in series in the arrangement direction of the thin grid lines through the tin paste pads 6.
The electrode pattern of the solar cell designed by the invention is only printed with thin grid lines at the cell end, and the main grid lines are eliminated; and meanwhile, the component end is connected with a tinned metal wire serving as a main grid through a tin paste bonding pad, so that the tinned metal wire and a thin grid line of the solar cell are well combined to collect and transmit current. In the invention, because a plurality of tin-plated metal wires are added as the main grid lines, the carrier transport path is shortened to reduce the series resistance, and the series resistance loss is reduced; and the shielding of the grid lines to sunlight is reduced by canceling the main grid lines, so that the photoproduction current is increased, and the photoelectric conversion efficiency is improved.
Meanwhile, the tin paste welding disc and the metal wire with tin plated on the outer surface can be used for conveniently and quickly connecting the metal wire serving as the main grid with the thin grid line stably in an electrical mode, so that the solar cell without the main grid has the manufacturing simplicity and the high efficiency of the traditional cell, other technical limitations can be broken through, and the requirements of the market on reducing the manufacturing cost of the solar cell without the main grid, reducing the technical cost and improving the manufacturing efficiency of the solar cell without the main grid are met.
According to the invention, the tin-plated metal wire and the thin grid line are fused by using the tin paste bonding pad, so that the interconnection welding of the battery without the main grid is realized, the design from the main grid to the multiple thin main grids of the battery is realized, the series resistance of the battery piece and the shielding area of the grid line are greatly reduced, the electrical loss of a welding strip and the shielding area of the welding strip are correspondingly reduced after the assembly is welded, and the purposes of reducing the silver paste consumption of the battery piece and improving the output power of the assembly are achieved. The scheme is simple, and the mature solder paste printing technology in the electronic industry is used, so that the reliability is high.
Example 2
This embodiment is further described with reference to embodiment 1.
As shown in fig. 6, the solar cell without the main grid comprises a cell 1 without the main grid and a plurality of upper and tin-plated metal wires 3 which are not mutually intersected and are intersected with each thin grid line 2 on the front surface of the cell 1, wherein a plurality of tin paste pads 6 are distributed on the thin grid lines 2 on the front surface of the cell 1, and the tin-plated metal wires 3 electrically connect the thin grid lines 2 provided with the tin paste pads 6 in series in the arrangement direction of the thin grid lines through the tin paste pads 6; the back electrodes of the battery piece 1 are arranged in a matrix, the back surface of the battery piece 1 is provided with tinned metal wires, the number of the tinned metal wires is consistent with the number of columns of the matrix arrangement, and the tinned metal wires are not intersected with each other, and the back electrodes on the same column are connected in series. In the back side, each tin-plated wire is the "main grid" on the back side of the cell.
Preferably, the number of the tinned metal wires on the back surface of the battery piece 1 is consistent with that on the front surface of the battery piece
Preferably, the tin-plated metal wire 3 is a tin-plated copper wire. The shape of the copper wire can be round, square, triangular or flat, and the diameter of the copper wire is 0.02-0.8 mm.
Preferably, the orthographic projection of the solder paste pad 6 on the cell 1 falls on the thin grid line 2 located right below the cell, so that the shielding of the solder paste pad on sunlight is prevented.
Preferably, the solder paste pad 6 is printed on the fine grid line 2 by using an SMT steel screen. The SMT printing of the steel mesh is cheap and reliable electronic component welding in the electronic EMS industry, and the method can reduce the grid-free packaging cost.
Example 3
A battery pack comprises a front layer material, an encapsulating material, a solar battery layer, an encapsulating material and a back layer material which are connected from top to bottom, wherein the solar battery layer comprises a plurality of solar batteries which are sequentially arranged, each solar battery is the solar battery in embodiment 1 or embodiment 2, and in two adjacent solar batteries, a tinned metal wire 3 on the front side of one solar battery is electrically connected with a tinned metal wire 3 on the back side of the other solar battery to realize the series connection of a positive electrode and a negative electrode.
Further, in two adjacent solar cells, the tin-plated metal wire 3 on the front surface of one solar cell is electrically connected with the tin-plated metal wire 3 on the back surface of the other solar cell through the bus bar 4.
According to the invention, the tin-plated metal wire and the thin grid line are fused by using the tin paste bonding pad, so that the interconnection welding of the battery without the main grid is realized, the design from the main grid to the multiple thin main grids of the battery is realized, the series resistance of the battery piece and the shielding area of the grid line are greatly reduced, the electrical loss of a welding strip and the shielding area of the welding strip are correspondingly reduced after the assembly is welded, and the purposes of reducing the silver paste consumption of the battery piece and improving the output power of the assembly are achieved
Example 4
A preparation method of a solar cell without a main grid comprises the following steps:
s1, printing a battery piece without a main grid, wherein only a thin grid line is arranged on an electrode of the battery piece; sintering the cell slice in a sintering furnace to form ohmic contact, and testing the cell slice by using a cell I-V test; the battery piece is preferably a silicon chip prepared by adopting a standard process flow of a PERC battery after film coating;
s2, printing a solder paste pad with the solder paste diameter of 0.1-0.6mm by using a steel mesh of the solder paste, wherein the solder paste diameter does not exceed the width of the thin grid line to the maximum extent, and the shading is reduced; the solder paste pads are distributed on the thin grid lines in 9-15 solder paste pads in the horizontal direction, and 6-25 solder paste pads are distributed in the vertical direction;
s3, enabling a plurality of tinned metal wires to be opposite to the tin paste disc, wherein the tinned metal wires are not intersected and are crossed with the thin grid lines, and preferably the tinned metal wires are perpendicular to the thin grid lines; the tin-plated metal wire electrically connects the thin grid lines 2 provided with the tin paste bonding pad 6 in series in the arrangement direction of the thin grid lines through the tin paste bonding pad 6;
s4, heating the battery piece obtained in the step S3 to enable the tin-plated metal wires and the fine grid lines to be welded through a solder paste welding pad 6;
s5, arranging tinned metal wires on the back of the cell piece, wherein the tinned metal wires are consistent with the longitudinal rows of the matrix arrangement of the back electrodes in number and do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same longitudinal row in series;
and S6, heating the battery piece obtained in the S5 to weld the tin-plated metal wire with the back electrode.
Example 5
A preparation method of a solar cell without a main grid comprises the following steps:
s1, printing a battery piece without a main grid, wherein only a thin grid line is arranged on an electrode of the battery piece; the battery piece is preferably a silicon chip prepared by adopting a standard process flow of a PERC battery after film coating; the back electrodes of the battery pieces are arranged in a matrix, 5 battery pieces are arranged in the transverse direction, 4 battery pieces are arranged in the vertical direction, and the size of the battery pieces is 0.5mm multiplied by 4 mm;
s2, arranging CCD contraposition Mark points at four corners of the silk screen positive motor graph of the cell without the main grid, wherein the size of the Mark points is 0.3-1mm, as shown in figure 4; the thin grid lines with different thin grid line widths and different thin grid numbers can be designed, and the width of the thin grid lines is preferably 0.05 mm;
s3, sintering the printed battery piece through a high-temperature sintering furnace to form ohmic contact, and performing I-V grading test;
s4, printing a solder paste pad with the diameter of 0.2-0.8mm by using an SMT steel mesh, wherein the diameter of the solder paste does not exceed the width of the thin grid line to the maximum extent, and shading is reduced; the solder paste pads are horizontally distributed on the thin grid line in the direction of 5 solder paste pads, and the solder paste pads are vertically distributed in the direction of 4 solder paste pads;
s5, enabling a plurality of tinned metal wires to be opposite to the tin paste disc, wherein the tinned metal wires are not intersected and are crossed with the thin grid lines, and preferably the tinned metal wires are perpendicular to the thin grid lines; the tin-plated metal wire electrically connects the thin grid lines 2 provided with the tin paste bonding pad 6 in series in the arrangement direction of the thin grid lines through the tin paste bonding pad 6; aligning 4 Mark points of the cell by the CCD, so that the copper wire and the soldering paste are accurately aligned, and the front cell main grid pattern and the back cell main grid pattern after the copper wire is welded are respectively shown in the figures 5 and 6;
s4, heating the battery piece obtained in the step S3 to enable the tin-plated metal wires and the fine grid lines to be welded through a solder paste welding pad 6;
s5, arranging tinned metal wires on the back of the cell piece, wherein the tinned metal wires are consistent with the longitudinal rows of the matrix arrangement of the back electrodes in number and do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same longitudinal row in series;
and S6, heating the battery piece obtained in the S5 to weld the tin-plated metal wire with the back electrode.
Example 6
A preparation method of a solar cell module without a main grid comprises the following steps:
s1, printing a battery piece without a main grid, wherein only a thin grid line is arranged on an electrode of the battery piece; the battery piece is preferably a silicon chip prepared by adopting a standard process flow of a PERC battery after film coating; the back electrodes of the battery pieces are arranged in a matrix, 5 battery pieces are arranged in the transverse direction, 4 battery pieces are arranged in the vertical direction, and the size of the battery pieces is 0.5mm multiplied by 4 mm;
s2, arranging CCD contraposition Mark points at four corners of the silk screen positive motor graph of the cell without the main grid, wherein the size of the Mark points is 0.3-1mm, as shown in figure 4; the thin grid lines with different thin grid line widths and different thin grid numbers can be designed, and the width of the thin grid lines is preferably 0.05 mm;
s3, sintering the printed battery piece through a high-temperature sintering furnace to form ohmic contact, and performing I-V grading test;
s4, printing a solder paste pad with the diameter of 0.2-0.8mm by using an SMT steel mesh, wherein the diameter of the solder paste does not exceed the width of the thin grid line to the maximum extent, and shading is reduced; the solder paste pads are horizontally distributed on the thin grid line in the direction of 5 solder paste pads, and the solder paste pads are vertically distributed in the direction of 4 solder paste pads;
s5, enabling a plurality of tinned metal wires to be opposite to the tin paste disc, wherein the tinned metal wires are not intersected and are crossed with the thin grid lines, and preferably the tinned metal wires are perpendicular to the thin grid lines; the tin-plated metal wire electrically connects the thin grid lines 2 provided with the tin paste bonding pad 6 in series in the arrangement direction of the thin grid lines through the tin paste bonding pad 6; aligning 4 Mark points of the cell by the CCD, so that the copper wire and the soldering paste are accurately aligned, and the front cell main grid pattern and the back cell main grid pattern after the copper wire is welded are respectively shown in the figures 5 and 6;
s4, heating the battery piece obtained in the step S3 to enable the tin-plated metal wires and the fine grid lines to be welded through a solder paste welding pad 6;
s5, arranging tinned metal wires on the back of the cell piece, wherein the tinned metal wires are consistent with the longitudinal rows of the matrix arrangement of the back electrodes in number and do not intersect with each other, and the tinned metal wires are used for connecting the back electrodes on the same longitudinal row in series;
s6, heating the battery piece obtained in the step S5 to enable the tin-plated metal wire to be welded with the back electrode;
s7, connecting a plurality of battery slices obtained in the step S6 in series: welding a piece of galvanized copper wire with the welded front surface as a main grid to the main grid area on the back surface of another piece of battery in sequence to form a welded battery string, thereby completing the welding of the anode and the cathode of the battery piece;
and S8, packaging according to the conventional solar cell module packaging method.
Example 7
The invention discloses an application of a solar cell without a main grid designed by the invention in converting solar energy into electric energy, which comprises the following steps: the solar cell without the main grid is placed in the sun, effectively absorbs solar energy and converts the solar energy into electric energy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383209.0A CN113078226A (en) | 2021-04-09 | 2021-04-09 | Main-grid-free solar cell, cell module, and preparation method and application of cell module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383209.0A CN113078226A (en) | 2021-04-09 | 2021-04-09 | Main-grid-free solar cell, cell module, and preparation method and application of cell module |
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| CN116329807A (en) * | 2023-03-31 | 2023-06-27 | 常州比太科技有限公司 | Welding wire, photovoltaic module welding method using welding wire and photovoltaic module |
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| WO2024012161A1 (en) * | 2022-07-12 | 2024-01-18 | 青海黄河上游水电开发有限责任公司西宁太阳能电力分公司 | Main gate-free ibc battery module unit and manufacturing method thereof, battery module, and battery module string |
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