CN117276385B - Reworkable film-covered photovoltaic cell string, photovoltaic module and preparation method thereof - Google Patents
Reworkable film-covered photovoltaic cell string, photovoltaic module and preparation method thereof Download PDFInfo
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- CN117276385B CN117276385B CN202311541602.3A CN202311541602A CN117276385B CN 117276385 B CN117276385 B CN 117276385B CN 202311541602 A CN202311541602 A CN 202311541602A CN 117276385 B CN117276385 B CN 117276385B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002313 adhesive film Substances 0.000 claims abstract description 100
- 238000003466 welding Methods 0.000 claims abstract description 66
- 238000004806 packaging method and process Methods 0.000 claims abstract description 24
- 239000000853 adhesive Substances 0.000 claims description 22
- 230000001070 adhesive effect Effects 0.000 claims description 22
- 239000012528 membrane Substances 0.000 claims description 15
- 238000003475 lamination Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000012943 hotmelt Substances 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 210000002489 tectorial membrane Anatomy 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 230000008439 repair process Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 24
- 239000010410 layer Substances 0.000 description 19
- 229910000679 solder Inorganic materials 0.000 description 16
- 239000003292 glue Substances 0.000 description 13
- 239000012790 adhesive layer Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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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
-
- 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
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
-
- 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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- Engineering & Computer Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Sustainable Development (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention relates to a reworkable film-covered photovoltaic cell string, a photovoltaic module and a preparation method thereof. The reworkable film-covered photovoltaic cell string comprises a photovoltaic cell piece, a welding strip and a fixed adhesive film, wherein the fixed adhesive film is adhered to the photovoltaic cell piece through a plurality of bonding points and is used for pressing and fixing the welding strip on the photovoltaic cell piece, and the bonding point area of the corresponding bonding point of the fixed adhesive film is separated from other parts of the fixed adhesive film and is only locally connected with other parts of the fixed adhesive film. The beneficial effects are that: the welding strip can be reliably fixed, the repair and disassembly are easy, the photovoltaic cell can be separated from the fixing adhesive film only by independently peeling off the photovoltaic cell from the bonding point area of the fixing adhesive film after the viscosity of the bonding point is eliminated or reduced, and only slight acting force is applied to the local part of the photovoltaic cell in the process, so that the photovoltaic cell is not easy to damage; when the assembly is laminated, no residual water vapor exists, and bubbles can be prevented from being generated during packaging.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a reworkable film-covered photovoltaic cell string, a photovoltaic module and a preparation method thereof.
Background
The preparation process of the photovoltaic module comprises the steps of firstly printing fine grid lines and main grid lines on the surfaces of photovoltaic cell pieces, then connecting a plurality of photovoltaic cell pieces into a photovoltaic cell string through welding strips, and finally typesetting, laminating and other processes are carried out on the photovoltaic cell string to form the photovoltaic module. The photovoltaic module is characterized in that the collection of the current of the photovoltaic cell is realized through a welding strip, a main grid line and a fine grid line on the surface of the photovoltaic cell, so that the power generation function of the battery module is realized, wherein the main grid line and the fine grid line are both prepared from silver paste.
The conventional photovoltaic cell is connected in series to form a cell string, the high-temperature welding of the welding strip and the main grid silver paste of the photovoltaic cell is adopted, the poor quality problems such as cold welding or overspray and the like are easy to occur in the high-temperature welding, the process yield is also influenced, the novel photovoltaic cell technology, especially the N-type HJT photovoltaic cell cannot be baked at high temperature, the efficiency of the photovoltaic cell is attenuated, in order to adapt to the flaking and low-temperature requirements of the photovoltaic cell, the zero-stress gluing technology is adopted, the low-temperature welding strip is directly glued with the thin grid line of the photovoltaic cell, the infrared heating welding mode is not used, and the welding of the low-temperature welding strip and the thin grid line of the photovoltaic cell is realized through the common lamination technology; meanwhile, the main grid line of the conventional photovoltaic cell is omitted, the photovoltaic cell without the main grid is manufactured, the use amount of silver paste of the photovoltaic cell is reduced, and the manufacturing cost of the photovoltaic cell is reduced. The zero-stress gluing technology of the photovoltaic cell without the main grid forms a new development direction of the photovoltaic module, has innovation and superiority in the aspects of product reliability, cost reduction per watt, module power increase and the like, and can be industrialized.
There are various implementation manners of the existing zero-stress gluing technology of the photovoltaic cell without main grid, for example, patent document CN217280809U, which is put forward by a photovoltaic enterprise in China, is named as a photovoltaic module without main grid, which has a thin film, and covers a solder strip through the thin film, and the solder strip is fixed on the photovoltaic cell without main grid through hot pressing of the thin film. The film in the technical scheme comprises an upper layer and a lower layer, wherein the upper layer is made of a material with the light transmittance reaching more than 75%, the lower layer is made of a PO material or EVA material, the film can generate a crosslinking reaction after being heated and has certain viscosity, and the solder strip can be fixed on the photovoltaic cell without the main grid.
For another example, patent document CN214753801U, named a tandem connection method of heterojunction no-main-grid battery pieces, is put forward by a photovoltaic enterprise in China, and describes that a layer of film protection is arranged between the heterojunction no-main-grid battery pieces and a low-melting-point welding strip and a glue film, and the glue film has viscosity, the melting point is about 150-160 ℃, and the maximum flow property is lower than that of the glue film.
Both patent documents describe a method for hot-melting a glue film on the surface of a photovoltaic cell and fixing a welding strip on the surface of the cell, but in actual production, when a plurality of photovoltaic cells are connected in series, because the glue film is integrally hot-melted on the surface of the matched photovoltaic cell, when one or more photovoltaic cells need to be disassembled when the series connection is bad, the glue film and the photovoltaic cells after the hot melting are difficult to be disassembled, or the good photovoltaic cells are difficult to be guaranteed to be broken due to repair, so that the bad photovoltaic cells in production cannot be repaired, the whole photovoltaic cell string cannot be used, and the yield of the photovoltaic cells and the photovoltaic cell string cannot reach the mass production standard.
In addition, the water vapor between the whole film-covered adhesive film and the photovoltaic cell piece has the problem that the vacuumizing is not clean during packaging lamination, and bubbles can be generated after packaging lamination.
In addition, the whole-surface film-covered photovoltaic cell string technology enables the film to completely separate the photovoltaic cell from the packaging film, and the film has the hidden trouble of layering between the photovoltaic cell string and the film due to lower fluidity of the adhesive layer with the adhesive function required by the film, so that the reliability of the product is poor.
To sum up, in order to meet the requirement of serial mass production of cells without main grids, a scheme capable of repairing and ensuring the yield is needed to be found.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the existing photovoltaic cell strings with solder strips fixed on the photovoltaic cell pieces through adhesive films are difficult to repair, and the whole photovoltaic cell strings cannot be used due to poor serial connection of the individual photovoltaic cell pieces.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a can reprocess tectorial membrane formula photovoltaic cell cluster, including the photovoltaic cell piece, weld area and fixed glued membrane, fixed glued membrane is fixed on the photovoltaic cell piece, be used for compressing tightly the welding area of fixed glued membrane below and fix on the photovoltaic cell piece, fixed glued membrane bonds on the photovoltaic cell piece through a plurality of bonding points, the setting position of bonding point keeps away the welding area, the bonding point region that corresponds the bonding point of fixed glued membrane is divided with other parts of fixed glued membrane and is only connected in part and other parts of fixed glued membrane, be used for making the bonding point region accessible local junction of fixed glued membrane to other parts transmission bonding force of fixed glued membrane, and can also peel off the photovoltaic cell piece alone with the bonding point region of fixed glued membrane after eliminating or reducing the viscidity of bonding point.
The preparation method of the reworkable film-covered photovoltaic cell string comprises the following steps: according to the structural sequence, the welding strip and the fixed adhesive film are arranged on the photovoltaic cell, and the fixed adhesive film is bonded with the surface of the photovoltaic cell through bonding points; and repeating the steps, and connecting a plurality of photovoltaic cell pieces in series through welding strips to form a repairable film-covered photovoltaic cell string.
The repair method of the reworkable film-covered photovoltaic cell string comprises the following steps: eliminating or reducing the tackiness of the bond; and then the photovoltaic cell piece is independently peeled off from the bonding point area of the fixed adhesive film, so that the whole fixed adhesive film and the welding strip are separated from the photovoltaic cell piece, and the repair of the repairable film-covered photovoltaic cell string is realized.
Further defined is that the local connection is located only on one side of the adhesive area of the fixed adhesive film.
Further defined, the adhesive point area of the fixed adhesive film is separated from other parts of the fixed adhesive film by a dividing line and/or a dividing notch.
Further defined, the fixing adhesive film is also provided with bonding holes, and the bonding holes are arranged at positions avoiding the welding strips and the bonding point areas. The bonding hole is used for enabling the packaging adhesive film in the packaging structure to be bonded with the surface of the photovoltaic cell piece through the bonding hole.
Further defined, the bond is a hot melt bond and the solder strip is a low temperature solder strip.
Further defined, two sides of each welding strip are matched with bonding points, and the local connection part of the bonding point area of the fixed adhesive film faces the matched welding strips.
The photovoltaic module comprises a packaging structure and a photovoltaic cell string packaged in the packaging structure, wherein the photovoltaic cell string is the repairable film type photovoltaic cell string, a fixing adhesive film of the repairable film type photovoltaic cell string is attached to the whole surface of a photovoltaic cell after each preparation step of the photovoltaic module, and a welding strip is electrically connected with the photovoltaic cell.
According to the preparation method of the photovoltaic module, the lamination step of the photovoltaic module is completed, the whole surface of the fixing adhesive film of the reworkable film-covered photovoltaic cell string is attached to the photovoltaic cell, and the welding strip is electrically connected with the photovoltaic cell.
The beneficial effects of the invention are as follows: the welding strip can be reliably fixed, the repair and disassembly are easy, the photovoltaic cell can be separated from the fixing adhesive film only by independently peeling off the photovoltaic cell from the bonding point area of the fixing adhesive film after the viscosity of the bonding point is eliminated or reduced, and only slight acting force is applied to the local part of the photovoltaic cell in the process, so that the photovoltaic cell is not easy to damage;
when the assembly is laminated, air can overflow between the bonding point area of the fixed adhesive film and other parts of the fixed adhesive film, the bonding holes on the fixed adhesive film can also overflow, no residual water vapor exists during vacuumizing, and air bubbles can be prevented from being generated during packaging;
in order to avoid the glue layer of the fixed glue film to penetrate between the welding strip and the thin grid line of the photovoltaic cell, the insulating barrier is formed, the mobility of the glue layer is required to be lower, the hidden danger of layering between the photovoltaic cell string and the fixed glue film exists, the packaging glue film and the photovoltaic cell can be directly contacted by the bonding hole and the dividing notch on the fixed glue film, the bonding effect is generated, layering of the photovoltaic cell string and the fixed glue film is prevented, and the reliability of a product is improved.
Drawings
The invention is further described below with reference to the drawings and examples;
fig. 1 is a schematic structural view of a single-sided solder strip of a photovoltaic cell of the present invention with a fixing adhesive film pressed and fixed;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic front view of the adhesive film of FIG. 1;
FIG. 4 is an exploded view of the adhesive film of FIG. 3;
fig. 5 is a schematic structural view of a bonding point area of the fixing adhesive film peeled off when the photovoltaic cell sheet in fig. 1 is reworked;
FIG. 6 is a schematic view of the structure in which the semicircular bond point area of FIG. 3 is replaced with a circular bond point area;
FIG. 7 is a schematic view showing a structure in which the semicircular bonding point region in FIG. 3 is replaced with a square bonding point region;
FIG. 8 is a schematic view of the structure in which the semicircular bond point area in FIG. 3 is replaced with a triangular bond point area;
fig. 9 is a schematic structural view of two photovoltaic cells of the present invention connected in a string;
FIG. 10 is an exploded view of FIG. 9;
FIG. 11 is a schematic view of the structure of the photovoltaic module of the present invention;
in the figure, 1 part of photovoltaic cell sheet, 1-1 part of fine grid line, 2 parts of welding strip, 3 parts of fixing adhesive film, 3-1 parts of bonding point area, 3-2 parts of isolation layer, 3-3 parts of thin adhesive layer, 4 parts of partition notch, 5 parts of bonding hole, 6 parts of panel, 7 parts of back plate, 8 parts of packaging adhesive film and 9 parts of photovoltaic cell string.
Detailed Description
As shown in fig. 1 to 10, a reworkable film-covered photovoltaic cell string comprises a photovoltaic cell piece 1, a welding strip 2 and a fixed adhesive film 3, wherein the fixed adhesive film 3 is covered on the welding strip 2, the fixed adhesive film 3 is fixed on the photovoltaic cell piece 1 and is used for tightly pressing and fixing the welding strip 2 below the fixed adhesive film 3 on the photovoltaic cell piece 1, the welding strip 2 connects a plurality of photovoltaic cell pieces 1 into a string, the fixed adhesive film 3 is bonded on the photovoltaic cell piece 1 through a plurality of bonding points, the welding strip 2 is avoided at the setting position of the bonding points, the bonding point area 3-1 of the corresponding bonding point of the fixed adhesive film 3 is separated from other parts of the fixed adhesive film 3 and is only locally connected with other parts of the fixed adhesive film 3, so that the bonding force can be transmitted to other parts of the fixed adhesive film 3 through local connection positions, and the bonding point area 3-1 of the fixed adhesive film 3 can be independently peeled off the photovoltaic cell piece 1 after the bonding point is eliminated or reduced.
In order to more conveniently peel off the photovoltaic cell sheet 1 alone from the adhesive point area 3-1 of the fixing adhesive film 3, in this embodiment, specifically, the local connection is located only on one side of the adhesive point area 3-1 of the fixing adhesive film 3. The adhesive point area 3-1 of the fixing adhesive film 3 is separated from other parts of the fixing adhesive film 3 by a separation notch 4. The dividing notch 4 encloses three sides of the adhesive point area 3-1 of the fixed adhesive film 3, and the remaining one side is a local connection part and is connected with other parts of the fixed adhesive film 3, and the adhesive point area 3-1 can be specifically designed in a semicircular, circular, square, triangular or other design mode.
In fig. 1 to 5, the adhesive point area 3-1 of the adhesive film 3 is substantially semicircular, in fig. 6, the adhesive point area 3-1 is substantially circular, in fig. 7, the adhesive point area 3-1 is square, and in fig. 8, the adhesive point area 3-1 is triangular.
The fixing adhesive film 3 is further provided with a plurality of bonding holes 5, which are used for bonding the packaging adhesive film 8 in the packaging structure with the surface of the photovoltaic cell 1 through the bonding holes 5, when the photovoltaic module is laminated, the packaging adhesive film 8 such as EVA or POE permeates into the bonding holes 5 in a hot melting way, and also permeates into the periphery of the bonding holes 5, so that the packaging adhesive film 8 is prevented from permeating between the welding strip 2 and the photovoltaic cell 1, the welding strip 2 is avoided at the setting position of the bonding holes 5, and the bonding point area 3-1 is also avoided at the setting position of the bonding holes 5. Preferably, the bonding hole 5 is a circular hole with a diameter d. In the figure, the adhesive holes 5 are arranged in a row at the middle of the photovoltaic cell sheet 1, uniformly distributed among each other. Of course, the adhesive holes 5 may be omitted.
The bonding points are hot-melt bonding points, the welding strips 2 are low-temperature welding strips used for welding with the photovoltaic cell pieces 1 in the lamination step of the assembly, the low-temperature welding strips adopted in the industry are generally braze welding strips with coatings, the coatings are metal layers or alloy layers, the melting point temperature of the coatings is between 120 ℃ and 160 ℃, and the number of the welding strips 2 which are generally required to be laid on the surface of each photovoltaic cell piece 1 is 2 to 28. It is of course not excluded that the solder strips are electrically connected to the photovoltaic cell 1 by direct mechanical contact, in which case the solder strips do not have to be low-temperature solder strips.
The photovoltaic cell 1 is a photovoltaic cell without a main grid, the photovoltaic cell without the main grid is a double-sided photovoltaic cell, and the whole surface and the back surface of the photovoltaic cell without the main grid are distributed with solder strips 2. The length of the photovoltaic cell without the main grid is L1, the width is B1, L1=1B1 to 2B1, the front and the back of the photovoltaic cell without the main grid are distributed with a plurality of thin grid lines 1-1, the thin grid lines 1-1 are formed by silver paste printing and solidifying, and the current is led out through the welding strips 2 which are vertically distributed, so that the silver paste can be saved because of the absence of the main grid lines. The welding between the low-temperature welding strip and the thin grid line 1-1 of the photovoltaic cell without the main grid achieves the effect of zero stress, and is suitable for flaking and low-temperature serial connection of the photovoltaic cell 1.
The fixed adhesive film 3 is a double-layer film formed by integrating an isolation layer 3-2 and a thin adhesive layer 3-3 through hot melting, the isolation layer 3-2 is made of a low-fluidity or non-fluidity material, the isolation layer 3-2 is positioned on one side of the fixed adhesive film 3, which is far away from the photovoltaic cell piece 1, the thin adhesive layer 3-3 is positioned on one side of the fixed adhesive film 3, which is close to the photovoltaic cell piece 1, the welding strip 2 is pressed and fixed on the photovoltaic cell piece 1 through the isolation layer 3-2, the thin adhesive layer 3-3 is used for attaching the fixed adhesive film 3 and the photovoltaic cell piece 1 together, and the thin thickness of the thin adhesive layer 3-3 is used for preventing the material of the thin adhesive layer 3-3 from entering between the welding strip 2 and the photovoltaic cell piece 1. Preferably, the fluidity of the thin adhesive layer 3-3 is lower than that of the encapsulation adhesive film 8, and the hot melt temperature is higher than that of the encapsulation adhesive film 8. The effect that the hot melting temperature of the thin adhesive layer 3-3 is higher than that of the packaging adhesive film 8 is that: the film layer 3-3 is prevented from being thermally melted again and excessively melted in the packaging layer process, so that the material of the film layer 3-3 permeates between the welding strip and the photovoltaic cell piece 1 to cause the collection current blocking.
The material of the isolation layer 3-2 is one or more than one composite of polyurethane, PUR, TPO, PA and the like, and the material of the thin adhesive layer 3-3 is one of EVA, POE, PVB.
The fixed adhesive film 3 is a whole film, and 1 piece of fixed adhesive film 3 correspondingly covers 1 surface of 1 piece of photovoltaic cell piece 1.
Preferably, in fig. 1 to 8, bonding points are matched on two sides of each welding strip 2, and the local connection part of the bonding point area 3-1 of the fixing adhesive film 3 faces the matched welding strips 2. It is not excluded that in some cases the bonding point has no unique mating relationship with the solder strips 2, and the bonding point between two solder strips 2 is used for the fixation of two adjacent solder strips 2, as shown in fig. 9 and 10.
The preparation method of the reworkable film-covered photovoltaic cell string comprises the following steps: according to the structural sequence, arranging the welding strip 2 and the fixed adhesive film 3 on the photovoltaic cell 1; then, the bonding point area 3-1 of the fixed adhesive film 3 is subjected to spot ironing, so that the bonding point area 3-1 of the fixed adhesive film 3 is subjected to hot melting and then is crosslinked and bonded with the surface of the photovoltaic cell piece 1, the fixed adhesive film 3 is firmly fixed on the photovoltaic cell piece 1 after cooling, and the welding strip 2 is also pressed and fixed on the photovoltaic cell piece 1 by the fixed adhesive film 3; repeating the steps, and connecting a plurality of photovoltaic cell pieces 1 in series through the welding strips 2 to form a repairable film-covered photovoltaic cell string.
In fig. 9 and 10, 2 photovoltaic cells 1 are connected in a string by solder strips 2, 2 photovoltaic cells 1 are matched with 3 groups of 18 solder strips 2,4 fixing adhesive films 3.
The repair method of the reworkable film-covered photovoltaic cell string comprises the following steps: heating each bonding point for eliminating or reducing the tackiness of the bonding point; and then, after the bonding point is thermally dissolved, sucking the bonding point area 3-1 of the fixed adhesive film 3 through a vacuum sucking device such as a sucker and the like to separate the bonding point area 3-1 of the fixed adhesive film 3 from the photovoltaic cell piece 1, so that the whole fixed adhesive film 3 and the welding strip 2 are separated from the photovoltaic cell piece 1, and the repair of the reworkable film-covered photovoltaic cell string is realized.
The photovoltaic module comprises a packaging structure and a photovoltaic cell string 9 packaged in the packaging structure, wherein the photovoltaic cell string 9 is the repairable film-covered photovoltaic cell string, a fixed adhesive film 3 of the repairable film-covered photovoltaic cell string is attached to the whole surface of a photovoltaic cell 1 after various preparation steps of the photovoltaic module, and a welding strip 2 is welded and connected with the photovoltaic cell 1.
As shown in fig. 11, the packaging structure of the general photovoltaic module includes a panel 6, a back plate 7 and a packaging adhesive film 8, and the structure from top to bottom includes the panel 6, the packaging adhesive film 8, a photovoltaic cell string 9, the packaging adhesive film 8 and the back plate 7 in sequence, in this embodiment, the photovoltaic cell string 9 is a reworkable film-covered photovoltaic cell string.
The preparation method of the photovoltaic module can adopt the prior art, and is characterized in that the adopted photovoltaic cell string is the reworkable film-covered photovoltaic cell string, and the whole surface of the fixing adhesive film 3 of the reworkable film-covered photovoltaic cell string is attached to the photovoltaic cell piece 1 and the welding strip 2 is welded to the photovoltaic cell piece 1 in the lamination step of the photovoltaic module.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
For example, the plurality of bonding points between the fixing adhesive film 3 and the photovoltaic cell sheet 1 are bonding points formed by dispensing adhesive to the photovoltaic cell sheet 1 or the adhesive points of the fixing adhesive film 3, and the adhesive of the adhesive points is thermosol or other types of adhesive, so long as the adhesive can conveniently eliminate or reduce the viscosity of the bonding points through some methods in the subsequent repairing process. In the above embodiment, the plurality of bonding points between the fixing adhesive film 3 and the photovoltaic cell 1 are bonding points formed by bonding the fixing adhesive film 3 and the photovoltaic cell after the thin adhesive layer 3-3 points of the fixing adhesive film 3 are scalded.
For another example, the fixed adhesive film 3 is in a strip shape, and 1 welding strip 2 is correspondingly covered by 1 fixed adhesive film 3; or 1 fixed glued membrane 3 corresponds to cover more than 2 welding strips 2, and at least 2 fixed glued membrane 3 corresponds to cover 1 piece photovoltaic cell piece 1's whole surface.
For another example, the adhesive point region 3-1 of the adhesive film 3 is separated from other portions of the adhesive film 3 by a dividing line. The parting line differs from the parting line 4 in that the opening of the parting line 4 is larger.
Claims (8)
1. The utility model provides a can reprocess tectorial membrane formula photovoltaic cell cluster, includes photovoltaic cell piece (1), welds area (2) and fixed glued membrane (3), and fixed glued membrane (3) are fixed on photovoltaic cell piece (1) for compress tightly fixed on photovoltaic cell piece (1) with welding area (2) of fixed glued membrane (3) below, characterized by: the fixing adhesive film (3) is adhered to the photovoltaic cell (1) through a plurality of bonding points, the bonding points are arranged at positions which avoid the welding belt (2), the bonding point areas (3-1) of the corresponding bonding points of the fixing adhesive film (3) are separated from other parts of the fixing adhesive film (3) and are only locally connected with other parts of the fixing adhesive film (3), the bonding point areas (3-1) of the fixing adhesive film (3) can be used for transmitting bonding force to other parts of the fixing adhesive film (3) through local connection positions, and the bonding point areas (3-1) of the fixing adhesive film (3) can be independently peeled off the photovoltaic cell (1) after the viscosity of the bonding points is eliminated or reduced.
2. The string of reworkable coated photovoltaic cells as set forth in claim 1, wherein: the local connection part is only positioned at one side of the bonding point area (3-1) of the fixed adhesive film (3).
3. The string of reworkable coated photovoltaic cells as set forth in claim 1, wherein: the adhesive point area (3-1) of the fixed adhesive film (3) is separated from other parts of the fixed adhesive film (3) through a separation line and/or a separation notch (4).
4. The string of reworkable coated photovoltaic cells as set forth in claim 1, wherein: the fixing adhesive film (3) is also provided with bonding holes (5), and the bonding holes (5) are arranged at positions avoiding the welding belt (2) and the bonding point area (3-1).
5. The string of reworkable coated photovoltaic cells as set forth in claim 1, wherein: the bonding points are hot-melt bonding points, and the welding strip (2) is a low-temperature welding strip.
6. The string of reworkable coated photovoltaic cells as set forth in claim 2, wherein: bonding points are matched on two sides of each welding strip (2), and the local connection part of the bonding point area (3-1) of the fixed adhesive film (3) faces the matched welding strips (2).
7. The utility model provides a photovoltaic module, includes packaging structure and encapsulation photovoltaic cell cluster in packaging structure, characterized by: the photovoltaic cell string is a reworkable film-covered photovoltaic cell string according to any one of claims 1-6, the fixing adhesive film (3) of the reworkable film-covered photovoltaic cell string is attached to the whole surface of the photovoltaic cell (1) after each preparation step of the photovoltaic module, and the welding strip (2) is electrically connected with the photovoltaic cell (1).
8. A method of making a photovoltaic module according to claim 7, characterized by: and finishing the whole surface lamination of the fixing adhesive film (3) of the reworkable film-covered photovoltaic cell string and the photovoltaic cell (1) and the electric connection of the welding strip (2) and the photovoltaic cell (1) in the lamination step of the photovoltaic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311541602.3A CN117276385B (en) | 2023-11-20 | 2023-11-20 | Reworkable film-covered photovoltaic cell string, photovoltaic module and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311541602.3A CN117276385B (en) | 2023-11-20 | 2023-11-20 | Reworkable film-covered photovoltaic cell string, photovoltaic module and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117276385A CN117276385A (en) | 2023-12-22 |
| CN117276385B true CN117276385B (en) | 2024-03-29 |
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| CN202311541602.3A Active CN117276385B (en) | 2023-11-20 | 2023-11-20 | Reworkable film-covered photovoltaic cell string, photovoltaic module and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217334108U (en) * | 2022-03-29 | 2022-08-30 | 宁夏小牛自动化设备有限公司 | Battery string and photovoltaic module |
| CN218160409U (en) * | 2022-09-06 | 2022-12-27 | 英利能源发展有限公司 | Photovoltaic cell string and photovoltaic module |
| CN219106170U (en) * | 2022-11-14 | 2023-05-30 | 东方日升新能源股份有限公司 | Full-black double-glass photovoltaic module |
| CN219642849U (en) * | 2022-12-30 | 2023-09-05 | 中能创光电科技(常州)有限公司 | Photovoltaic cell string and photovoltaic module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217334108U (en) * | 2022-03-29 | 2022-08-30 | 宁夏小牛自动化设备有限公司 | Battery string and photovoltaic module |
| CN218160409U (en) * | 2022-09-06 | 2022-12-27 | 英利能源发展有限公司 | Photovoltaic cell string and photovoltaic module |
| CN219106170U (en) * | 2022-11-14 | 2023-05-30 | 东方日升新能源股份有限公司 | Full-black double-glass photovoltaic module |
| CN219642849U (en) * | 2022-12-30 | 2023-09-05 | 中能创光电科技(常州)有限公司 | Photovoltaic cell string and photovoltaic module |
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| CN117276385A (en) | 2023-12-22 |
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