CN116364789A - Photovoltaic cell, photovoltaic module and preparation method of photovoltaic module - Google Patents
Photovoltaic cell, photovoltaic module and preparation method of photovoltaic module Download PDFInfo
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- CN116364789A CN116364789A CN202111618023.5A CN202111618023A CN116364789A CN 116364789 A CN116364789 A CN 116364789A CN 202111618023 A CN202111618023 A CN 202111618023A CN 116364789 A CN116364789 A CN 116364789A
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- photovoltaic cell
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims description 79
- 230000001681 protective effect Effects 0.000 claims description 46
- 239000000853 adhesive Substances 0.000 claims description 38
- 230000001070 adhesive effect Effects 0.000 claims description 37
- 239000002313 adhesive film Substances 0.000 claims description 32
- 238000004806 packaging method and process Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 11
- 239000003292 glue Substances 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000003475 lamination Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 description 62
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000013007 heat curing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—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
-
- 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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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
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- Photovoltaic Devices (AREA)
Abstract
The invention relates to a photovoltaic cell, a photovoltaic module and a preparation method of the photovoltaic module, wherein the photovoltaic cell comprises the following components: the photovoltaic cell comprises a silicon substrate and auxiliary grid lines which are arranged on the upper surface of the silicon substrate in parallel at intervals, wherein each auxiliary grid line is provided with preset contact points which are arranged at intervals, and the preset contact points are arranged in a row in the direction perpendicular to the length of the auxiliary grid line.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic cell, a photovoltaic module and a preparation method of the photovoltaic module.
Background
The electrode of the photovoltaic cell is formed by screen printing conductive silver paste on a silicon substrate and forming ohmic contact with the silicon substrate by high-temperature sintering. The electrode is mainly composed of a main grid line and an auxiliary grid line. In order to reduce the cost of the photovoltaic cells and increase the light receiving area, the above problems are usually solved in the market by adopting a mode of reducing the width of the main grid line, so that in order to ensure the following manufacturing process of the photovoltaic module, the main grid line and the welding strip are convenient to cooperate to connect a plurality of photovoltaic cells in series, and the main grid line is usually provided with a welding pad, the width of the welding pad is often wider than the line width of the main grid line, so that the cost of the conductive silver paste is still high.
Disclosure of Invention
The invention provides a novel photovoltaic cell, a photovoltaic module and a preparation method thereof to solve the problems.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a photovoltaic cell comprises a silicon substrate and auxiliary grid lines which are parallel to the upper surface of the silicon substrate and are arranged at intervals, wherein each auxiliary grid line is provided with preset contact points which are arranged at intervals, and the preset contact points are arranged in a row in the direction perpendicular to the length of the auxiliary grid line.
Further, the preset contact point is provided with a contact point main body and a connecting part for connecting the contact point main body and the auxiliary grid line, and the width of the preset contact point is gradually narrowed from the center of the contact point main body to the direction of the connecting part.
Further, the width dimension of the preset contact point is larger than the width of the auxiliary grid line, the maximum width of the preset contact point is 0-30um larger than the width of the auxiliary grid line, and the length range of the preset contact point is as follows: 200-800um.
Further, the preset contact points on the same pair of grid lines comprise edge contact points of the edges of the adjacent silicon substrates and intermediate contact points inside the edge contact points, and the distance between the two preset contact points is equal to twice the distance between the edge contact points and the bottom edges of the adjacent silicon substrates.
The invention also provides a photovoltaic module, which comprises upper glass, a transparent adhesive film, a battery string, an encapsulation adhesive film and an isolation layer which are overlapped from top to bottom, wherein the battery string comprises a plurality of photovoltaic cells and welding strips which are connected with adjacent photovoltaic cells in series, the welding strips are positioned on preset contact points in the direction perpendicular to the length of the auxiliary grid lines, and the welding strips are fixed with the photovoltaic cells through adhesive glue so that electric connection is formed between the welding strips and the preset contact points.
Further, the adhesive is arranged between two preset contact points of the end edges of the adjacent photovoltaic cells, and the size range of the adhesive is 300-600um.
Further, in the length direction of the auxiliary grid line, the size range of the welding strip is 150-350um.
Further, the photovoltaic cell further comprises a protective film covered on the welding strip, the protective film is covered on the welding strip and is wrapped on the welding strip through high-temperature treatment, the width of the protective film is not smaller than that of the welding strip, and the length of the protective film is not smaller than that of the welding strip on the photovoltaic cell.
Further, the protection film is formed by compounding a first protection film and a second protection film, the first protection film is arranged adjacent to the transparent adhesive film and is made of the same material as the packaging adhesive film, and the second protection film is arranged adjacent to the welding strip.
The invention also provides a preparation method of the photovoltaic module, wherein,
pre-paving a first welding strip at a welding station;
the photovoltaic cells with the upper surface facing upwards are transported to a soldering station,
paving a second welding strip on the upper surface of the photovoltaic cell, so that the second welding strip is right above a preset contact point on the photovoltaic cell;
arranging adhesive glue between the photovoltaic cell and the second welding strip, wherein the adhesive glue is arranged between two adjacent preset contact points at intervals;
and carrying out heating and curing treatment on the photovoltaic cell, the adhesive and the second welding strip to form a cell string.
And further, a back main grid is arranged on the back of the photovoltaic cell, and after the photovoltaic cell with the upward surface is conveyed to a welding station, the photovoltaic cell and the first welding strip are heated and welded, and then a second welding strip is paved on the preset contact point.
Further, after the battery string is formed, a protective film is obtained to cover the second welding strip;
and packaging the laminated upper glass, transparent adhesive film, battery serial, packaging adhesive film and isolation layer together by adopting high-temperature lamination treatment.
Further, the back surface of the photovoltaic cell is designed to be the same as the upper surface without the main grid, and then, before the photovoltaic cell with the upper surface facing upwards is conveyed to a welding station, adhesive glue is arranged on the back surface of the photovoltaic cell, and then, the photovoltaic cell is turned over so that the upper surface of the photovoltaic cell faces upwards.
Further, after the battery string is formed, a protective film is obtained to cover the second welding strip and the first welding strip;
and packaging the laminated upper glass, transparent adhesive film, battery serial, packaging adhesive film and isolation layer together by adopting high-temperature lamination treatment.
Further, the temperature range of the heating curing treatment is 150-180 ℃, and the treatment duration range is as follows: 5-30s.
Compared with the prior art, the invention has the beneficial effects that: according to the photovoltaic cell, through the design of no main grid with the preset contact point arranged on the auxiliary grid line, the shading area of the photovoltaic cell can be effectively reduced, and meanwhile, the use of metal slurry is reduced; according to the photovoltaic module, the welding strip is fixed on the preset contact point by adopting the matching of the adhesive and the protective film, so that the welding strip is electrically connected with the preset contact point, and the overall production cost of the photovoltaic module is reduced.
Drawings
Fig. 1 is a schematic structural view of one embodiment of a photovoltaic cell of this invention.
Fig. 2 is a schematic structural view of an embodiment of the photovoltaic module of the present invention.
Fig. 3 is a schematic structural view of another embodiment of the photovoltaic module of the present invention.
Fig. 4 is a flow chart of a method of manufacturing the photovoltaic module in the embodiment of fig. 2.
Fig. 5 is a flowchart of a method of manufacturing the photovoltaic module in the embodiment of fig. 3.
The photovoltaic cell comprises a 1-photovoltaic cell, a 11-silicon substrate, a 12-auxiliary grid line, a 13-preset contact point, a 13-contact point main body, a 132-connecting part, a 133-edge contact point, a 134-middle contact point, a 14-back main grid, a 100-photovoltaic module, a 10-cell serial, a 20-transparent adhesive film, 30-upper glass, a 40-packaging adhesive film, a 50-isolation layer, a 2-welding strip, a 21-first welding strip, a 22-second welding strip, a 3-adhesive and a 4-protective film.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for the convenience of simplifying the description of the present invention, and are not meant to indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the scope of protection of the present invention. Specifically, in the present invention, the side facing the sun is the upper side, and the opposite side is the lower side.
In the various illustrations of the invention, some dimensions of structures or portions may be exaggerated relative to other structural portions for convenience of illustration, and thus serve only to illustrate the basic structure of the inventive subject matter.
The invention relates to a photovoltaic cell 1, as shown in fig. 1, the photovoltaic cell 1 comprises a silicon substrate 11 and auxiliary grid lines 12 which are arranged on the upper surface of the silicon substrate 11 at intervals, wherein each auxiliary grid line 12 is provided with preset contact points 13 which are arranged at intervals, the preset contact points 13 are arranged in a row in the direction perpendicular to the length of the auxiliary grid line 12, the photovoltaic cell 1 adopts a design without a main grid, and the preset contact points 13 on each auxiliary grid line 12 are used for being matched with a welding strip 2 to form electric connection so as to collect and conduct the current of the photovoltaic cell 1, so that the shading area of the photovoltaic cell 1 is reduced, the use of metal slurry is saved, and the production cost of the photovoltaic cell 1 is further reduced.
Specifically, the secondary grid line 12 is formed by screen printing metal paste and sintering at high temperature, and is used for collecting the current of the photovoltaic cell 1, and in this embodiment, the width of the secondary grid line 12 is between 28 and 32um, so that the photovoltaic cell 1 has a lower shading area.
Further, the preset contact points 13 on the same sub-grid line 12 include edge contact points 133 of edges of adjacent silicon substrates 11 and intermediate contact points 134 inside the edge contact points 133, and the distance between the two preset contact points 13 is equal to twice the distance between the edge contact points 133 and the edges of the adjacent silicon substrates 11, that is, the distance between each preset contact point 13 and each adjacent contact point 13 is the same in the length direction of the sub-grid line 12, and meanwhile, the preset contact points 13 can just cover the whole area of the photovoltaic cell 1, so that the current of the photovoltaic cell 1 can be collected and conducted after the follow-up welding strip 2 is matched.
In the direction perpendicular to the length of the auxiliary grid lines 12, the preset contact points 13 are arranged in rows, which is beneficial for the solder strip 2 to connect all the auxiliary grid lines 12 and conduct the current collected by the auxiliary grid lines 12.
Further, the preset contact point 13 has a contact point main body 131, a connection portion 132 for connecting the contact point main body 131 and the sub-grid line 12, and the width of the preset contact point 13 gradually narrows from the center of the contact point main body 131 to the direction of the connection portion 132, preferably, the shape of the preset contact point 13 includes, but is not limited to, diamond and oval, which can ensure that the wider position of the contact point main body 131 can form good contact with the solder strip 2, and simultaneously, the position close to the connection portion 132 gradually narrows to reduce the shading area and reduce the use of metal paste.
Specifically, the width dimension of the preset contact point 13 is greater than the width of the secondary gate line 12, the maximum width of the preset contact point 13 is 0-30um greater than the width of the secondary gate line 12, and the length of the preset contact point 13 is in the range of: 200-800um, so as to increase the contact area between the preset contact point 13 and the solder strip 2 as much as possible, so that good contact with the solder strip 2 is facilitated in the subsequent bonding process with the solder strip 2, in this embodiment, the length of the preset contact point 12 is preferably greater than the width of the solder strip 2, so that the solder strip 2 is positioned when in contact with the solder strip 2, so as to avoid the situation that the solder strip 2 deflects.
It is understood that the photovoltaic cell 1 of the present invention is not limited to the type, shape and size of the silicon substrate 11, as long as each of the sub-grid lines 12 is provided with a predetermined contact point 13, which is within the protection scope of the photovoltaic cell 1 of the present invention.
The photovoltaic cell 1 according to the present invention further provides a photovoltaic module, as shown in fig. 2 and 3, the photovoltaic module includes an upper glass 30, a transparent adhesive film 20, a cell string 10, an encapsulation adhesive film 40, and an isolation layer 50 that are overlapped from top to bottom, where the photovoltaic module encapsulates the cell string 10 in a sealed space between the upper glass 30 and the isolation layer 50 through the transparent adhesive film 20 and the encapsulation adhesive film 40 to resist the invasion of external environment.
Specifically, the battery string 10 includes a plurality of the photovoltaic cells 1 and the solder strips 2 connected in series to the adjacent photovoltaic cells 1, the solder strips 2 are located on the preset contact points 13 in the direction perpendicular to the length of the secondary grid line 12, and the solder strips 2 are fixed with the photovoltaic cells 1 by the adhesive 3 to form electrical connection between the solder strips 2 and the preset contact points 13. The photovoltaic module forms good contact by adopting a mode that the welding belt 1 is in direct contact with the preset contact point 13, and further fixes the welding belt 2 and the photovoltaic cell 1 by adopting the adhesive 3. The photovoltaic module omits the welding process of the welding strip 2, so that the type of the welding strip 2 which can be matched with the photovoltaic cell 1 is increased, and the applicability of the photovoltaic cell 1 is improved.
It can be understood that the photovoltaic cell 1 in the photovoltaic module may be a whole piece, or may be a half piece equally divided by the whole piece along the direction of the secondary grid line 12, which are all within the protection scope of the photovoltaic module of the present invention, and the following detailed description will be given by taking the photovoltaic cell 1 with the size being half of the whole piece as an example.
Further, in the length direction of the secondary grid line 12, the solder strip 2 is located at a position in the middle of the preset contact point 13, preferably, the size range of the solder strip 2 is 150-350um, the width of the solder strip 2 is smaller than the length of the preset contact point 13, so that the solder strip 2 is convenient to be positioned, in this embodiment, the solder strip 2 includes a first solder strip 21 disposed on the back surface of the first photovoltaic cell 1 and a second solder strip 22 disposed on the upper surface of the first photovoltaic cell 1 in the cell string 10, where the second solder strip 22 is used for connecting two photovoltaic cells 1 adjacent in tandem.
In this embodiment, the shape of the solder strip 2 includes, but is not limited to, a circle, a triangle, so as to reduce shielding of the upper surface of the photovoltaic cell 1; the solder strip 2 may be tin-copper material or pure copper solder strip with surface oxidation-preventing treatment, which is within the protection scope of the embodiment.
Further, in the direction perpendicular to the length of the secondary gate line 12, the adhesive 3 is located between two adjacent preset contact points 13, and the size range of the adhesive 3 is 300-600um, so that the adhesive 3 is prevented from covering the secondary gate line 12.
Further, at least two adhesive glues 3 are provided on the same photovoltaic cell 1 for increasing and balancing the fit between the solder strip 2 and the photovoltaic cell 1. Preferably, the adhesive 3 is disposed between two preset contact points 13 at the end edges of adjacent cells 1, that is, the two adhesive 3 are respectively located at the end edges of the photovoltaic cells 1, so as to facilitate the matching and dispensing operation of the solder strip 2 and the photovoltaic cells 1.
In this embodiment, the adhesive 3 may be a thermoplastic adhesive or a thermosetting adhesive, and the solder ribbon 2 may be firmly fixed on the photovoltaic cell 1 by heating.
As a preferred embodiment of the photovoltaic module, the photovoltaic module further comprises a protective film 4 covered on the solder strip 2, the protective film 4 is covered on the solder strip 2 and is wrapped on the solder strip 2 through high-temperature treatment, the width of the protective film 4 is not smaller than the width of the solder strip 2, the length of the protective film 4 is not smaller than the length of the solder strip 2 on the photovoltaic cell 1, and the fixation between the solder strip 2 and the photovoltaic cell 1 is enhanced.
Specifically, the protective film 4 is formed by compounding a first protective film and a second protective film, the first protective film is disposed adjacent to the transparent adhesive film 20 and is made of the same material as the packaging adhesive film 20, so as to facilitate good adhesion between the protective film 4 and the transparent adhesive film 20; the second protective film is adjacent to the solder strip 2, preferably, the material of the second protective film is a polyolefin material, and the polyolefin is a thermoplastic material, so that the protective film contracts after heating and further fixes the solder strip 2 on the surface of the photovoltaic cell 1, and meanwhile, the transparent adhesive film 20 is prevented from flowing into a gap between the solder strip 2 and the photovoltaic cell 1 after melting in the lamination process, so that poor contact between the solder strip 2 and a preset contact point 13 is avoided, and of course, the second protective film can be made of a material with the same property as polypropylene, so long as the material capable of achieving the same technical effect as polypropylene is within the protection scope of the embodiment.
As another preferred embodiment of the photovoltaic module of the present invention, as shown in fig. 3, the back surface of the photovoltaic cell 1 in the cell string 10 is designed to be the same as the upper surface without a main grid, correspondingly, a preset contact point 13 is also provided at a corresponding position on the back side auxiliary grid line 12, the solder strip 2 is fixedly matched with the back surface of the photovoltaic cell 1 through the adhesive 3, the outer side of the solder strip 2 is provided with a protective film 4, a first protective film adjacent to the packaging adhesive film 40 of the protective film 4 is provided, and a second protective film adjacent to the solder strip 2 is provided, so that good contact is formed between the solder strip 2 and the back surface of the photovoltaic cell 1.
Based on the photovoltaic module of the present invention, the present invention further provides a preparation method of the photovoltaic module, as shown in fig. 4 and fig. 5, where the preparation method includes: pre-laying a first welding strip 21 at a welding station; conveying the photovoltaic cell 1 with the upper surface facing upwards to a welding station, so that a first welding strip 21 is positioned below the photovoltaic cell 1, a preset contact point 13 is positioned right above the first welding strip 21, and paving a second welding strip 22 on the upper surface of the photovoltaic cell 1, so that the second welding strip 22 is positioned right above the preset contact point 13 on the photovoltaic cell 1; an adhesive 3 is disposed between the photovoltaic cell 1 and the second solder strip 22, the adhesive 3 is disposed between two adjacent preset contact points 13 at intervals, and the photovoltaic cell 1, the adhesive 3 and the second solder strip 22 are subjected to heat curing treatment to form a cell string 10.
In the preparation method of the photovoltaic module, the upper surface of the photovoltaic cell 1 is upward, so that the glue is conveniently dispensed on the surface of the photovoltaic cell 1, and the preparation method is suitable for the preparation process of the photovoltaic module of the photovoltaic cell 1 without a main grid photovoltaic cell 1, particularly suitable for the photovoltaic cell 1 with low-temperature slurry, omits the welding process of the welding strip 2, reduces the loss in the preparation process of the photovoltaic module, and has wide application range.
Of course, the second solder strip 22 is laid on the upper surface of the photovoltaic cell 1, and the two steps of arranging the adhesive 3 between the photovoltaic cell 1 and the second solder strip 22 can be exchanged, so that the preparation of the photovoltaic module can be realized.
The adhesive glue 3 is preferably arranged on both sides of the adjacent edges of the photovoltaic cell 1, i.e. the mating fastening points between the solder strip 2 and the photovoltaic cell 1 are located at both ends, so that a good contact is made between the middle part of the solder strip 2 and the predetermined contact point 13.
In this embodiment, the temperature range of the heat curing treatment is 150-180 ℃, and the treatment duration range is: and 5-30s, so that the bonding adhesive 3 is heated to firmly bond the solder strip 2 and the photovoltaic cell 1 together, and good frontal contact is formed between the solder strip 2 and the preset contact point 13.
As a preferred embodiment of the method for manufacturing a photovoltaic module according to the present invention, as shown in fig. 4, a back main grid 14 is disposed on the back surface of the photovoltaic cell 1, and after the photovoltaic cell 1 with the upper surface facing up is conveyed to the welding station, the photovoltaic cell 1 and the first solder strip 21 are heated and welded, and then the second solder strip 22 is laid on the preset contact point 13. That is, the back surface of the photovoltaic cell 1 and the first solder tape 21 are first subjected to a soldering process, and then a bonding adhesive 3 is disposed between the upper surface of the photovoltaic cell 1 and the second solder tape 22.
Further, after the photovoltaic cell 1 and the solder strip 2 are subjected to heat curing treatment to form a cell string 10, the protective film 4 is obtained to cover the second solder strip 22; the laminated upper glass 30, transparent adhesive film 20, battery serial 10, packaging adhesive film 40 and isolation layer 50 are packaged together by high temperature lamination treatment, and the high layer lamination is a conventional process and will not be repeated.
Specifically, the second protective film of the protective film 4 is made of a thermoplastic material so as to prevent the transparent adhesive film from flowing into the gap between the solder strip 2 and the photovoltaic cell 1 after being melted in the lamination process, and avoid poor contact between the solder strip 2 and the preset contact point 13.
In actual operation, the width of the protective film 4 ranges from 0.6 cm to 2cm, and the total thickness of the protective film is 0.2 mm to 0.6mm, so that the protective film can be laid according to the length of a single photovoltaic cell 1 or the total length of the photovoltaic cells 1 in the cell string 10, and the wrapping effect of the protective film 2 on the welding belt 2 is ensured.
As another preferred embodiment of the method for manufacturing a photovoltaic module according to the present invention, as shown in fig. 5, the back surface of the photovoltaic cell 1 is designed to have the same main grid-free design as the upper surface, and then, before the photovoltaic cell 1 with the upper surface facing upwards is conveyed to the welding station, the adhesive 3 is disposed on the back surface of the photovoltaic cell 1, and then, the photovoltaic cell 1 is turned over so that the upper surface faces upwards, that is, the process of matching the solder strip 2 with the back surface of the photovoltaic cell 1 is as follows: paving a first welding strip 21, dispensing on the back of the photovoltaic cell 1, turning the photovoltaic cell 1 to enable the upper surface to face upwards, and then adopting a treatment mode of the upper surface of the photovoltaic cell 1 to carry out subsequent operation.
In this embodiment, since the first solder strip 21 is matched with the adhesive on the back of the photovoltaic cell, after the photovoltaic cell 1 and the solder strip 2 are formed into the cell string 10 through heat curing treatment, the protective film 4 is obtained to cover the first solder strip 21 and the second solder strip 22 respectively, and then the laminated upper glass 30, the transparent adhesive film 20, the cell string 10, the packaging adhesive film 40 and the isolation layer 50 are packaged together through high-temperature lamination treatment, that is, the protective film 4 needs to be laid on the back and the upper surface of the photovoltaic cell 1, and the material and the size of the protective film 4 are the same as the requirements in the above embodiment, which are not repeated.
In summary, the photovoltaic cell 1 provided by the invention adopts a design without a main grid, and the preset contact point 13 on each auxiliary grid line 12 and the welding strip 2 are matched to form an electrical connection so as to collect and conduct the current of the photovoltaic cell 1, thereby reducing the shading area of the photovoltaic cell 1, saving the use of metal slurry and further reducing the production cost of the photovoltaic cell 1. The photovoltaic module of the invention adopts the cooperation of the adhesive 3 and the protective film 4 to fix the welding strip 2 on the photovoltaic cell 1 so as to ensure that good contact is formed between the welding strip 2 and the preset contact point 13.
It should be understood that although the present disclosure describes embodiments in terms of examples, not every embodiment is provided with a single embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (15)
1. The utility model provides a photovoltaic cell, includes that silicon substrate and silicon substrate upper surface are parallel and the vice grid line of interval setting, its characterized in that: each auxiliary grid line is provided with preset contact points which are arranged at intervals, and the preset contact points are arranged in a row in the direction perpendicular to the length of the auxiliary grid line.
2. The photovoltaic cell of claim 1, wherein: the preset contact point is provided with a contact point main body and a connecting part for connecting the contact point main body and the auxiliary grid line, and the width of the preset contact point is gradually narrowed in the direction from the center of the contact point main body to the connecting part.
3. The photovoltaic cell of claim 1, wherein: the width dimension of the preset contact point is larger than the width of the auxiliary grid line, the maximum width of the preset contact point is 0-30um larger than the width of the auxiliary grid line, and the length range of the preset contact point is as follows: 200-800um.
4. The photovoltaic cell of claim 1, wherein: the preset contact points on the same pair of grid lines comprise edge contact points of the edges of the adjacent silicon substrates and intermediate contact points inside the edge contact points, and the distance between the two preset contact points is equal to twice the distance between the edge contact points and the bottom edges of the adjacent silicon substrates.
5. A photovoltaic module: the method is characterized in that: the upper glass, the transparent adhesive film, the battery serial, the packaging adhesive film and the isolation layer which are overlapped from top to bottom are arranged, the battery serial comprises a plurality of photovoltaic cells as set forth in any one of claims 1 to 4 and welding strips which are connected with adjacent photovoltaic cells in series, the welding strips are positioned on preset contact points in the direction perpendicular to the length of the auxiliary grid lines, and the welding strips are fixed with the photovoltaic cells through adhesive glue so that electric connection is formed between the welding strips and the preset contact points.
6. The photovoltaic module of claim 5, wherein: the adhesive is arranged between two preset contact points of the end edges of the adjacent photovoltaic cells, and the size range of the adhesive is 300-600um.
7. The photovoltaic module of claim 5, wherein: and the size range of the welding strip is 150-350um in the length direction of the auxiliary grid line.
8. The photovoltaic module of claim 5, wherein: the photovoltaic cell also comprises a protective film covered on the welding strip, wherein the protective film is covered on the welding strip and is wrapped on the welding strip through high-temperature treatment, the width of the protective film is not smaller than that of the welding strip, and the length of the protective film is not smaller than that of the welding strip on the photovoltaic cell.
9. The photovoltaic module of claim 8, wherein: the protective film is formed by compounding a first protective film and a second protective film, the first protective film is arranged adjacent to the transparent adhesive film and is made of the same material as the packaging adhesive film, and the second protective film is arranged adjacent to the welding strip.
10. A method of manufacturing a photovoltaic module according to claim 5, wherein:
pre-paving a first welding strip at a welding station;
the photovoltaic cells with the upper surface facing upwards are transported to a soldering station,
paving a second welding strip on the upper surface of the photovoltaic cell, so that the second welding strip is right above a preset contact point on the photovoltaic cell;
arranging adhesive glue between the photovoltaic cell and the second welding strip, wherein the adhesive glue is arranged between two adjacent preset contact points at intervals;
and carrying out heating and curing treatment on the photovoltaic cell, the adhesive and the second welding strip to form a cell string.
11. The method of manufacturing a photovoltaic module according to claim 10, wherein: and a back main grid is arranged on the back of the photovoltaic cell, and after the photovoltaic cell with the upward surface is conveyed to a welding station, the photovoltaic cell and the first welding strip are heated and welded, and then a second welding strip is paved on the preset contact point.
12. The method of manufacturing a photovoltaic module according to claim 11, wherein after forming the cell string: the preparation method further comprises the following steps:
the protective film is obtained to cover the second welding strip;
and packaging the laminated upper glass, transparent adhesive film, battery serial, packaging adhesive film and isolation layer together by adopting high-temperature lamination treatment.
13. The method of manufacturing a photovoltaic module according to claim 10, wherein: and the back surface of the photovoltaic cell is designed to be the same as the upper surface without the main grid, and then adhesive glue is arranged on the back surface of the photovoltaic cell before the photovoltaic cell with the upper surface facing upwards is conveyed to a welding station, and then the photovoltaic cell is turned over to enable the upper surface of the photovoltaic cell to face upwards.
14. The method of manufacturing a photovoltaic module according to claim 13, wherein after forming the cell string: the preparation method further comprises the following steps:
the protective film is obtained to cover the second welding strip and the first welding strip;
and packaging the laminated upper glass, transparent adhesive film, battery serial, packaging adhesive film and isolation layer together by adopting high-temperature lamination treatment.
15. The method of manufacturing a photovoltaic module according to claim 12 or 14, wherein: the temperature range of the heating curing treatment is 150-180 ℃, and the treatment duration range is as follows: 5-30s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116583124A (en) * | 2023-07-13 | 2023-08-11 | 北京曜能科技有限公司 | Wire, flat cable, connecting piece and preparation method thereof, photovoltaic device and preparation method thereof |
| CN117374165A (en) * | 2023-12-04 | 2024-01-09 | 正泰新能科技股份有限公司 | Preparation method of photovoltaic module without main grid, photovoltaic cell without main grid and module |
-
2021
- 2021-12-27 CN CN202111618023.5A patent/CN116364789A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116583124A (en) * | 2023-07-13 | 2023-08-11 | 北京曜能科技有限公司 | Wire, flat cable, connecting piece and preparation method thereof, photovoltaic device and preparation method thereof |
| CN116583124B (en) * | 2023-07-13 | 2024-01-23 | 北京曜能科技有限公司 | Wire, flat cable, connecting piece and preparation method thereof, photovoltaic device and preparation method thereof |
| CN117374165A (en) * | 2023-12-04 | 2024-01-09 | 正泰新能科技股份有限公司 | Preparation method of photovoltaic module without main grid, photovoltaic cell without main grid and module |
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