CN115172480A - Solar cell module and method for manufacturing same - Google Patents
Solar cell module and method for manufacturing same Download PDFInfo
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- CN115172480A CN115172480A CN202210962261.6A CN202210962261A CN115172480A CN 115172480 A CN115172480 A CN 115172480A CN 202210962261 A CN202210962261 A CN 202210962261A CN 115172480 A CN115172480 A CN 115172480A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 69
- 239000002313 adhesive film Substances 0.000 claims abstract description 31
- 238000004806 packaging method and process Methods 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 14
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 238000010030 laminating Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 abstract description 24
- 239000000463 material Substances 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 238000004132 cross linking Methods 0.000 abstract description 5
- 239000000084 colloidal system Substances 0.000 abstract description 4
- 238000004026 adhesive bonding Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 229910000679 solder Inorganic materials 0.000 description 43
- 238000003475 lamination Methods 0.000 description 14
- 229910003460 diamond Inorganic materials 0.000 description 10
- 239000010432 diamond Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 229910001152 Bi alloy Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005476 soldering Methods 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
- H01L31/0216—Coatings
- H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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)
- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
Abstract
The application relates to the photovoltaic field, and relates to a solar cell module and a manufacturing method thereof. The assembly forms a laminated packaging structure and sequentially comprises the following components from top to bottom: a back plate, an adhesive film, a functional film, a battery string, a functional film, an adhesive film and a back plate; any two battery pieces are connected through a welding strip to form a battery string; the welding strip is fixed on the battery piece; the battery string comprises a plurality of battery pieces; the functional membrane is partially hollow. Hollow out construction's functional film not only can completely cut off the influence of molten state glued membrane to gluing solidly and weld the area, and more importantly hollow out construction can improve the degree of crosslinking between subassembly colloid and the battery to reduce the risk possibility of appearing in the reliability test of subassembly in later stage. According to the manufacturing method, the heat-shrinkable property of the functional film is utilized to strengthen and fix the gain of the welding strip. The functional film is simple, flexible and accurate to process, light transmission loss is not additionally considered, a main grid and the whole glue film are not needed, material is saved, and the application value is high.
Description
Technical Field
The application relates to the field of photovoltaics, in particular to a solar cell module and a manufacturing method thereof.
Background
The functional film applied to the photovoltaic module in the industry at present is a full-page film, and the low-temperature solder strip which has melted tin is wholly pressed down through lamination, so that the solder strip can only be attached to a silver paste grid line of a battery, the solder strip is ensured to be in optimized electrical contact with the battery in the stress-free welded module, and the solder strip cannot be stabilized under the pushing of a molten state adhesive film.
However, although the entire battery assembly can pass the initial test, the reliability test at the later stage may have different risks.
Disclosure of Invention
An object of the embodiments of the present application is to provide a solar cell module and a method for manufacturing the same.
In a first aspect, the present application provides a solar cell module,
forming a laminated packaging structure, which comprises the following components in sequence from top to bottom:
the battery pack comprises a back plate, an adhesive film, a functional film, a battery string, a functional film, an adhesive film and a back plate;
the functional membrane is partially hollow.
The application provides a solar module not only can completely cut off the influence of molten state glued membrane to gluing solid welding area, and more importantly hollow out construction can improve the degree of handing over between subassembly colloid and the battery to reduce the risk possibility to appear in the reliability test in later stage of subassembly.
In other embodiments of the present application, the functional film has a plurality of holes formed thereon to partially hollow out the functional film.
In other embodiments of the present application, the plurality of holes are distributed in an array.
In other embodiments of the present application, the plurality of holes are at least one of circular holes, square holes, diamond holes, or polygonal holes.
In other embodiments of the present application, the diameter of the circular hole, the long side of the square hole, the long side of the diamond hole, or the long side of the polygonal hole is less than or equal to 1/(the dispensing number-1) of the length of the solder strip.
In other embodiments of the present application, the diameter of the circular hole is 3mm to 7mm; and/or
The side length of the square holes, the rhombic holes or the polygonal holes is 4-6 mm.
In other embodiments of the present application, when the plurality of holes are circular holes, the plurality of holes and the solder strips on the battery piece are arranged in a staggered manner; and/or
When the plurality of holes are square holes, rhombic holes or polygonal holes, the extending directions of the long sides of the square holes, the long sides of the rhombic holes and the long sides of the polygonal holes are perpendicular to the extending direction of the welding strip.
In other embodiments of the present application, a plurality of long functional films are provided at intervals on the surface of the battery string; laying a plurality of strip-shaped functional films on the solder strip along a direction vertical to the solder strip, and packaging the positions between the adhesive film and the solder strip; the position between every two adjacent strip-shaped functional films is hollowed out, and the adjacent strip-shaped functional films are not in contact.
In other embodiments of the present application, the distance between the two adjacent long functional films is in a range of 4mm to 6 mm;
the width of the long functional film is 3mm-50mm; and/or
The length of the long-strip-shaped functional film is 1250mm-1270mm.
In other embodiments of the present application, the back plate is glass.
In a second aspect, the present application provides a method of manufacturing a solar cell module,
obtaining a battery piece printed with thin grid lines and without a main grid;
connecting any two battery pieces through welding strips to form a plurality of battery strings; the method comprises the following steps that any two battery pieces are connected through welding strips, wherein the welding strips are fixed on the battery pieces, and the welding strips are ensured to be in direct contact with thin grid lines on the corresponding battery pieces; each battery string comprises a plurality of battery pieces;
typesetting the battery strings and welding the bus bars;
laying a functional film with a part of hollowed positions on the surface of the battery string;
laying a packaging adhesive film on the functional film;
laying a back plate on the adhesive film to form a battery assembly;
and heating and laminating the battery assembly to enable each welding strip to form alloy connection with the thin grid lines on the surface of the corresponding battery piece so as to finish the packaging of the solar battery assembly.
According to the manufacturing method of the solar cell module, the functional film with the hollow structure is formed, so that the influence of a molten-state adhesive film on the adhesive fixing welding strip can be isolated, more importantly, the hollow structure can improve the intersection degree between the module colloid and the cell, and therefore the risk possibility of the module in the later reliability test is reduced.
Furthermore, the manufacturing method is simple, flexible and accurate in processing of the functional film, application of materials is improved to a great extent, extra light transmission loss does not need to be considered, the goal of cost reduction and efficiency improvement is completely met, and the application value is extremely high.
Furthermore, the manufacturing method of the application does not need a main grid and an entire glue film, and is beneficial to saving materials.
Furthermore, the manufacturing method can strengthen and fix the gain of the welding belt by utilizing the heat shrinkage property of the functional film.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a partial structural view of a first solar cell module according to the present application;
FIG. 2 is a partial structural view of a second solar cell module according to the present application;
fig. 3 is a partial structural view of a third solar cell module according to the present application.
An icon: 100-a solar cell module; 110-a cell piece; 120-solder strip; 130-inter-cell area; 140-inter-string region; 150-circular perforated area of functional membrane; 160-square open pore area of functional film; 170-long strip functional film.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The inventor finds that to ensure the reliability of the solar cell module, and preferably ensure that the functional film needs to form an effective crosslinking degree with the cell before and after the module lamination process, the following 4 key tasks need to be completed:
1) In the critical operation 1, the main body of the functional film needs to cover the solder strip portion as much as possible to maintain the solder strip in a vertical state with respect to the cell fine grid lines at each position during the lamination process.
2) In the key work 2, enough parts of the functional film are required to be positioned on the surface of the cell piece for forming stable supporting force for the welding strip.
3) And 3, performing key work, namely reserving a space for the functional film with a reasonable size, performing crosslinking on the surface of the adhesive film and the surface of the battery piece, and performing crosslinking around the adhesive film so as to improve the local binding force of the functional film on the welding strip.
4) In the key work 4, a large enough space is needed between the battery pieces, the part of the battery pieces which cannot cover the glue film is used for emptying the solder strip overflowing part due to high-temperature tin melting, and tin liquid is prevented from flowing into the front side of the battery through gaps between the battery pieces (the effect is similar to short circuit).
Therefore, the inventor finds that the functional film can guarantee good toughness in the lamination process, the adhesive film which is not molten can permeate the functional film to the lower layer to interfere the stability of the solder strip, and the functional film can continuously provide the mild transmission action force for the solder strip in the whole lamination process, so that the surface alloy component of the solder strip can be kept molten until being solidified again and can be kept in close contact with the grid line of the battery, and the connection firmness of the solder strip and the grid line of silver paste can be guaranteed.
Further, the inventor finds that the functional film has a certain degree of thermal shrinkage in the laminating process, the stress problem of local resistance to overall thermal shrinkage in the whole use of the functional film in the laminating process can be well solved by cutting the functional film, the local shrinkage of the functional film in the direction along the welding strip is maintained, the vacancy of the functional film is controlled, the low-temperature alloy component in the welding strip is convenient to extrude, and therefore the key work 4 is completed.
Based on the above knowledge, the embodiment of the present invention provides a solar cell module 100, which forms a package on package structure and sequentially includes, from top to bottom:
the battery pack comprises a back plate, an adhesive film, a functional film, a battery string, a functional film, an adhesive film and a back plate;
any two battery pieces are connected through a welding strip to form a battery string; the solder strip is fixed on the battery piece through dispensing; the battery string comprises a plurality of battery pieces; the functional membrane is partially hollow.
The back plate in the present application is preferably glass, and may be a back plate made of other materials.
The application provides a solar module not only can completely cut off the influence of molten state glued membrane to gluing solid welding area, and more importantly hollow out construction can improve the degree of handing over between subassembly colloid and the battery to reduce the risk possibility of appearing in the reliability test in later stage of subassembly.
Further, in some embodiments of the present application, the functional film is provided with a plurality of holes to partially hollow out the functional film.
Further, in some embodiments of the present application, the plurality of holes are distributed in an array.
Further, in some embodiments of the present application, the plurality of holes are at least one of circular holes, square holes, diamond holes, or polygonal holes.
Exemplarily, referring to fig. 1, in the embodiment shown in fig. 1, the plurality of holes are circular holes. In the solar cell module 100, a functional film circular opening region 150 is formed in the cell sheet 110.
Further, in some embodiments of the present application, the diameter of the circular hole, the long side of the square hole, the long side of the diamond hole, or the long side of the polygonal hole is less than or equal to 1/(the dispensing number-1) of the length of the solder strip.
Further, in some embodiments of the present application, the diameter of the circular hole is 3mm to 7mm.
Further, in some embodiments of the present application, the sides of the square, diamond, or polygonal apertures are 4mm to 6mm.
Further, in some embodiments of the present application, in other embodiments of the present application, when the plurality of holes are circular holes, the plurality of holes and the solder strips on the battery piece are arranged in a staggered manner.
Further, in some embodiments of the present application, when the plurality of holes are square holes, diamond holes or polygonal holes, the extending directions of the long sides of the square holes, the long sides of the diamond holes and the long sides of the polygonal holes are perpendicular to the extending direction of the solder strip.
Exemplarily, referring to fig. 2, in the embodiment shown in fig. 2, the plurality of holes are square holes. The length direction of the square hole is perpendicular to the extending direction of the welding strip. In the solar cell module 100, a functional film square opening region 160 is formed in the cell sheet 110.
Further, in some embodiments of the present application, a plurality of elongated functional films are provided at intervals on the surface of the battery string; laying a plurality of strip-shaped functional films on the solder strip along a direction vertical to the solder strip, and packaging the positions between the adhesive film and the solder strip; the position between every two adjacent strip-shaped functional films is hollowed out, and the adjacent strip-shaped functional films are not in contact.
Referring to fig. 3, in the embodiment shown in fig. 3, in the solar cell module 100, a plurality of long functional films 170 are provided at intervals on the cell sheet 110. The plurality of long functional films 170 are uniformly arranged.
Further, in some embodiments of the present application, the distance between two adjacent long functional films 170 is in the range of 4mm to 6mm. Further, in some embodiments of the present application, the distance between two adjacent elongated functional films 170 is in the range of 4.1mm to 5.9mm. Further, in some embodiments of the present application, the distance between the two adjacent long functional films is in a range of 4mm to 6mm.
Further, in some embodiments of the present application, the width of the functional film in a long shape is 3mm to 50mm; further, in some embodiments of the present application, the length of the functional film in the form of a long strip is 1250mm to 1270mm.
Some embodiments of the present application provide a method for manufacturing the solar cell module, including the steps of:
and S1, preparing a battery piece.
In some embodiments of the present application, a cell sheet printed with thin grid lines without a main grid can be directly obtained. Such as by commercially available means.
Further, in some embodiments of the present application, it may be obtained by preparation. Illustratively, silver paste consumption is reduced in the manufacturing process of the battery piece, the specification of the silver main grid can be reduced or the main grid line can be directly cancelled, and the auxiliary grid structure is directly adopted.
Further, in some embodiments of the present application, the step of preparing the battery sheet comprises:
and (4) dispensing between the fine grids on the surface of the battery (at the designed position) by using a small needle tube or other dispensing equipment to finish the auxiliary adhesive tape dispensing of the solder tape. And ensuring that the welding strip is in direct contact with the thin grid line on the corresponding battery piece.
Illustratively, by designing the interval of the main grid, each welding strip with the low melting point and the Bi alloy is arranged one by one according to the dispensing position (the arrangement direction is consistent with the direction of the main grid and is 90 degrees with the auxiliary grid line), and meanwhile, the pressure of each part with a glue joint contact is ensured to be in a proper range. Further, any two battery pieces are connected through the welding strips to form a plurality of battery strings. Further, each battery string includes a plurality of battery pieces. Further, the plurality of battery strings are laid out and bus bars are welded.
And S2, paving a functional film with a part of hollowed-out positions on the surface of the battery string.
In some embodiments of the present application, the step of laying a functional film with partially hollowed positions on the surface of the battery string includes:
and a plurality of holes are formed in the whole functional film and then the functional film is laid on the surface of the battery string.
Further, in some embodiments of the present application, the plurality of holes are round holes or square holes.
Further, in some embodiments of the present application, when the plurality of holes are round holes, the plurality of holes are disposed in a staggered manner with respect to the solder strips on the battery piece.
When a plurality of holes are round holes, the plurality of holes and the welding strips on the battery piece are arranged in a staggered mode, and the function of fixing the welding strips can be achieved.
Further, in some embodiments of the present application, when the plurality of holes are square holes, the length direction of the square holes is perpendicular to the extending direction of the solder strip.
When a plurality of holes are square holes, the length direction of the square holes is perpendicular to the extending direction of the welding strip, and the effect of fixing the welding strip can be achieved.
In other optional embodiments of the present application, the plurality of holes are rhombic holes or polygonal holes. When the plurality of holes are rhombic holes or polygonal holes, the extending directions of the long sides of the square holes, the long sides of the rhombic holes and the long sides of the polygonal holes are mutually perpendicular to the extending direction of the welding strip.
Further, in some embodiments of the present application, the plurality of holes are distributed in an array.
Further, in some embodiments of the present application, each edge of the functional film is left with a blank area having a width of 4mm to 10mm, and the blank area is not perforated.
Further optionally, each edge of the functional film is left with a blank area with a width of 4.5mm-9.5mm, and the blank area is not provided with holes. Further optionally, each edge of the functional film is provided with a blank area with the width of 5mm-9mm, and the blank area is not provided with holes. Further optionally, each edge of the functional film is left with a blank area with a width of 5.5mm-8.5mm, and the blank area is not provided with holes.
Illustratively, each edge of the functional film leaves a blank area of 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, or 8.5mm width, which is not apertured.
Further, in some embodiments of the present application, referring to fig. 1, the plurality of holes are circular holes. In the solar cell module 100, a functional film circular opening region 150 is formed in the cell sheet 110.
The plurality of round holes are distributed on the battery piece in an array. The plurality of holes and the welding strips on the battery piece are arranged in a staggered mode. Further optionally, a plurality of round holes are distributed in the middle of the battery piece in an array manner, so that blank areas with certain widths are reserved at four edges of the battery piece. The blank area is not provided with a round hole. Further optionally, the blank area has a width of 4mm-10mm.
Further, in some embodiments of the present application, the diameter of the circular hole is less than or equal to 1/(the number of glue dots-1) of the length of the solder strip of the battery piece. Illustratively, in some embodiments of the present application, the number of the glue dots of the solder strip auxiliary glue on the battery width trajectory line is 22, and then the diameter of the circular hole is less than or equal to 1/21 of the solder strip length of the battery piece. Illustratively, the diameter of the round hole is 1/21, 1/22, 1/23, 1/24, 1/25, 1/26, 1/27, 1/28, 1/29 or 1/30 of the length of the welding strip of the battery piece.
In other optional embodiments of the present application, when the plurality of holes are diamond shaped holes or polygonal shaped holes, the long sides of the diamond shaped holes or the long sides of the polygonal shaped holes are less than or equal to 1/(the dispensing number-1) of the length of the solder strip. Illustratively, in some embodiments of the present application, the number of the glue dots of the solder strip auxiliary glue on the battery width trajectory line is 22, and the longer side of the diamond hole or the longer side of the polygonal hole is less than or equal to 1/21 of the solder strip length of the battery piece. Illustratively, the long side of the rhombic hole or the long side of the polygonal hole is 1/21, 1/22, 1/23, 1/24, 1/25, 1/26, 1/27, 1/28, 1/29 or 1/30 of the length of the welding strip of the battery piece.
Further, in some embodiments of the present application, the diameter of the circular hole is 3mm to 7mm. Further optionally, in some embodiments of the present application, the diameter of the circular hole is 3.1mm to 6.9mm. Further optionally, in some embodiments of the present application, the diameter of the circular hole is 3.2mm to 6.8mm. Illustratively, the diameter of the circular aperture is 3.3mm, 3.5mm, 3.7mm, 3.8mm, 4.0mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 5.0mm, 5.2mm, 5.5mm, 5.8mm, 6.0mm, 6.5mm, or 6.6mm.
Further, in some embodiments of the present application, illustratively, referring to fig. 2, the plurality of holes are square holes. The length direction of the square hole is perpendicular to the extending direction of the welding strip. In the solar cell module 100, a functional film square opening region 160 is formed in the cell sheet 110.
Further alternatively, the square hole may be rectangular or square.
The square holes are distributed on the battery piece in an array mode. Further optionally, the square holes are distributed in the middle of the battery piece in an array manner, so that blank areas with certain widths are reserved at four edges of the battery piece. The blank area is not provided with square holes. Further optionally, the blank area has a width of 4mm-10mm.
Further, in some embodiments of the present application, the long side of the square hole is less than or equal to 1/21 of the length of the solder strip of the battery piece. Illustratively, in some embodiments of the present application, the number of the glue dots of the solder strip auxiliary glue on the battery width trajectory line is 22, and then the diameter of the circular hole is less than or equal to 1/21 of the solder strip length of the battery piece.
Illustratively, the long side of the square hole is 1/21, 1/22, 1/23, 1/24, 1/25, 1/26, 1/27, 1/28, 1/29 or 1/30 of the length of the welding strip of the battery piece.
Further, in some embodiments of the present invention, the side of the square hole is 4mm to 6mm. Further optionally, in some embodiments of the present application, the side length of the square hole is 4.1mm to 5.9mm. Further optionally, in some embodiments of the present application, the side length of the square hole is 4.2mm to 5.8mm. Illustratively, the sides of the square holes are 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, or 5.7mm.
In some embodiments, various shapes can be used in combination, for example, a round hole and a square hole can be selected at the same time; or selecting round holes and rhombic holes simultaneously; or simultaneously selecting a round hole and a polygonal hole; or simultaneously selecting square holes, round holes, rhombic holes and polygonal holes. The side length of the rhombic hole or the polygonal hole is 4mm-6mm. The long sides of the rhombic holes or the long sides of the polygonal holes are less than or equal to 1/(dispensing quantity-1) of the length of the welding strip.
Further, in some embodiments of the present application, the step of forming the hollow-out functional film on the surface of the battery piece includes:
a plurality of long functional films 170 are arranged on the surface of the battery string at intervals; laying a plurality of strip-shaped functional films on the solder strip along a direction vertical to the solder strip, and packaging the positions between the adhesive film and the solder strip; the position between every two adjacent strip-shaped functional films is hollowed out, and the adjacent strip-shaped functional films are not in contact.
Further, in some embodiments of the present application, referring to fig. 3, a plurality of elongated functional films 170 are uniformly arranged.
Further, in some embodiments of the present application, the distance between two adjacent elongated functional films 170 is in the range of 4mm to 6mm. Further, in some embodiments of the present application, a distance between two adjacent elongated functional films is in a range of 4.1mm to 5.9mm.
Illustratively, the spacing between two adjacent elongated functional films 170 is 4.2mm, 4.5mm, 4.8mm, 5.0mm, 5.2mm, 5.4mm, 5.5mm, or 5.8mm.
Further, in some embodiments of the present application, the width of the functional film in a long shape is 3mm to 50mm. Further optionally, the width of the functional film in a long shape is 4mm to 49mm. Illustratively, the width of the functional film in a long shape is 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 48mm.
Further, in some embodiments of the present application, the length of the functional film in the form of a long strip is 1250mm to 1270mm. Further optionally, the length of the long functional film is 1251mm-1269mm. Illustratively, the length of the functional film in a long strip shape is 1255mm, 1258mm, 1260mm, 1262mm, 1265mm, or 1268mm.
And S3, paving a packaging adhesive film on the functional film.
The adhesive film can be laid by adopting the conventional method in the field.
And S4, laying a back plate on the adhesive film to form the battery assembly.
And laying a back plate on the adhesive film by adopting a conventional method in the field.
And S5, carrying out heating lamination on the cell assembly to enable each welding strip to form alloy connection with the thin grid lines on the surface of the corresponding cell piece so as to complete the packaging of the solar cell assembly.
Illustratively, in some embodiments of the present application, the stacked assembly is fed into a laminator at a lamination temperature that depends on the alloy composition of the wire, illustratively, the SnBiPb composition controls the lamination temperature between 120 ℃ and 150 ℃, and other lamination parameters are modified in the direction of the equipment work.
The application provides a manufacturing method of solar cell module, use through a small amount of glue guarantees that alloy solder strip and battery piece can the steady state arrange under certain condition, meanwhile has certain electrical property contact, in the lamination process, the use of the functional film of focus dependence hollow out construction (non-full page), both do benefit to the balanced pressure of functional film to the solder strip in the lamination process, cut the trompil simultaneously and do benefit to upper and lower glued membrane cross-linking intercommunication, the trompil of suitable position also can avoid soldering the SnBiPb alloy composition on the strip and cause the short circuit risk to the battery piece edge under the inseparable extrusion of functional film, in addition, can also compound functional film and conventional glued membrane as required, carry out the integration operation.
This application adopts current functional membrane, through hollow out construction design, uses the material of functional membrane to reach the optimum, reaches both save material loss, can reach the best effect of encapsulation and the reliability of subassembly again.
It should be noted that the functional film of the present application can be used in combination with conventional adhesive films in the field, which is convenient for production activities and has high operability.
It should be further noted that the functional film material of the present application may be a conventional functional film material in the art, and it should be noted that different materials have different shrinkage rates, and the material shrinkage rate may be designed in consideration of the size of the hollow structure according to actual needs.
According to the solar cell module, high-temperature welding is not needed to form strings; the welding strip is combined with the battery fine grid under the action of the functional film, and the battery units are connected in series in a low-melting-point alloy welding strip mode; the functional film is arranged between the common adhesive film and the battery string, and plays a special lamination welding gain effect.
The features and properties of the present application are described in further detail below with reference to examples:
example 1
The solar cell module is prepared according to the following steps:
and adopting a battery piece printed with thin grid lines and without a main grid.
And dispensing glue between the fine grids on the surface of the battery by using a small needle tube or other glue dispensing equipment to complete auxiliary adhesive distribution of the welding strip.
And arranging each welding strip containing Bi alloy with low melting point one by one according to the dispensing position, and simultaneously ensuring that the welding strip is directly contacted with the thin grid line on the corresponding battery piece.
And curing the glue by adopting a curing mode corresponding to the glue.
And connecting any two battery plates through welding strips to form a plurality of battery strings. Each battery string includes a plurality of battery pieces. And typesetting the plurality of battery strings and welding the bus bars.
And cutting and hollowing the functional film for later use by taking the layout pattern of the component as a standard. And laying a functional film with a part of hollowed-out positions on the surface of the battery string.
And laying an encapsulation adhesive film on the functional film.
And laying a back plate on the adhesive film to form the battery assembly.
And (3) feeding the stacked assembly into a laminating machine, wherein the laminating temperature depends on the alloy components of the welding wires, such as SnBiPb components, the laminating temperature can be controlled to be 120-150 ℃, and the battery assembly is heated and laminated, so that each welding strip is respectively in alloy connection with the thin grid lines on the surface of the corresponding battery piece, and the packaging of the solar battery assembly is completed.
The solar cell module produced is shown in fig. 1: the assembly is shown in partial view and includes a cell 110, a solder strip 120, an inter-cell region 130, and a functional film circular opening region 150.
The width of the functional film is designed to be 1240-1290 mm; the diameter of the round opening is designed to be between 3mm and 7mm; the distance between the center of the circular opening and the long edge of the functional membrane is 7mm-10mm, and the holes are distributed in an array.
The degree of thermal shrinkage of the functional film depends on the material of the functional film, the heating temperature and time, etc., the thermal shrinkage of the functional film used in this embodiment is 20% under the heating condition used in this embodiment, the pore diameter of the functional film before thermal melting is controlled to be 3.75-8.75mm, and the pore diameter after lamination is 3-7 mm.
The solar cell module manufactured by the embodiment isolates the influence of the molten glue film on the glue-fixed welding strip, improves the intersection degree between module glue and the cell, and reduces the risk possibility of the module in the later reliability test.
Example 2
The solar cell module is prepared according to the following steps:
and adopting a battery piece printed with thin grid lines and without a main grid.
And dispensing glue between the fine grids on the surface of the battery by using a small needle tube or other glue dispensing equipment to complete auxiliary adhesive distribution of the welding strip.
And arranging each welding strip containing Bi alloy with low melting point one by one according to the dispensing position, and simultaneously ensuring that the welding strip is directly contacted with the thin grid line on the corresponding battery piece.
And curing the glue by adopting a curing mode corresponding to the glue.
And connecting any two battery slices through welding strips to form a plurality of battery strings. Each battery string includes a plurality of battery pieces. And typesetting the plurality of battery strings and welding the bus bars.
And cutting and hollowing the functional film for later use by taking the layout pattern of the component as a standard. And laying a part of hollowed functional film on the surface of the battery string.
And laying an encapsulation adhesive film on the functional film.
And laying a back plate on the adhesive film to form the battery assembly.
And (3) feeding the stacked assembly into a laminating machine, wherein the laminating temperature depends on the alloy component of the welding wire, such as SnBiPb component, the laminating temperature can be controlled to be 120-150 ℃, and the battery assembly is heated and laminated, so that each welding strip is respectively in alloy connection with the thin grid lines on the surface of the corresponding battery piece, and the packaging of the solar battery assembly is completed.
The solar cell module produced is shown in fig. 2: the assembly is shown in partial view and includes a cell 110, a solder strip 120, an inter-cell region 130, an inter-string region 140, and a functional film square opening region 160.
The width of the functional film is designed to be 1240-1290 mm; the long edge of the rectangular hole or the side length of the square hole is between 4 and 6 mm; the distance between the center of the rectangular hole and the long edge of the functional membrane is 7-10mm, and the holes are distributed in an array.
The degree of thermal shrinkage of the functional film depends on the material of the functional film, the heating temperature and time, etc., the thermal shrinkage of the functional film used in this embodiment is 20% under the heating condition used in this embodiment, the pore diameter of the functional film before thermal melting is controlled to be 3.75-8.75mm, and the pore diameter after lamination is 3-7 mm.
The solar cell module manufactured by the embodiment isolates the influence of the molten glue film on the glue-fixed welding strip, improves the intersection degree between module glue and the cell, and reduces the risk possibility of the module in the later reliability test.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A solar cell module characterized in that:
forming a laminated packaging structure, which sequentially comprises the following components from top to bottom:
a back plate, an adhesive film, a functional film, a battery string, a functional film, an adhesive film and a back plate;
the functional membrane is partially hollow.
2. The solar cell module as claimed in claim 1,
a plurality of holes are formed in the functional film so that the functional film is partially hollowed out;
the plurality of holes are distributed in an array.
3. The solar cell module according to claim 2,
the plurality of holes are at least one of round holes, square holes, rhombic holes or polygonal holes.
4. The solar cell module as claimed in claim 3,
the diameter of the round hole is 3mm-7mm; and/or
The side length of the square hole, the rhombic hole or the polygonal hole is 4-6 mm.
5. The solar cell module according to claim 3 or 4,
any two battery pieces are connected through a welding strip to form the battery string; the welding strip is fixed on the battery piece through dispensing; the battery string comprises a plurality of battery sheets;
the diameter of the round hole, the long side of the square hole, the long side of the rhombic hole or the long side of the polygonal hole is less than or equal to 1/(dispensing quantity-1) of the length of the welding strip.
6. The solar cell module as claimed in claim 5,
when the plurality of holes are round holes, the plurality of holes and the welding strip are arranged in a staggered mode; and/or
And when the plurality of holes are square holes, rhombic holes or polygonal holes, the extending directions of the long sides of the square holes, the long sides of the rhombic holes and the long sides of the polygonal holes are perpendicular to the extending direction of the welding strip.
7. The solar cell module as claimed in claim 5,
a plurality of strip-shaped functional films are arranged on the surface of the battery string at intervals; laying the plurality of strip-shaped functional films on the welding strips along a direction perpendicular to the welding strips, and packaging the positions between the common packaging adhesive films and the welding strips; the position between every two adjacent strip-shaped functional films is hollow, and the adjacent strip-shaped functional films are not in contact.
8. The solar cell module as claimed in claim 7,
the distance between two adjacent long functional films is in the range of 4mm-6 mm;
the width of the long-strip-shaped functional film is 3mm-50mm; and/or
The length of the long strip-shaped functional film is 1250mm-1270mm.
9. The solar cell module as claimed in claim 1,
the back plate is made of glass.
10. A method for manufacturing a solar cell module, comprising:
obtaining a battery piece;
connecting any two battery pieces through welding strips to form a plurality of battery strings; the method comprises the following steps that any two battery pieces are connected through a welding strip, wherein the welding strip is fixed on the battery pieces, and the welding strip is ensured to be in direct contact with thin grid lines on the corresponding battery pieces; each battery string comprises a plurality of battery sheets;
typesetting the battery strings and welding bus bars;
laying a functional film with a part of hollowed positions on the surface of the battery string;
laying a packaging adhesive film on the functional film;
laying a back plate on the adhesive film to form a battery assembly;
and heating and laminating the battery assembly to enable each welding strip to form alloy connection with the thin grid line on the surface of the corresponding battery piece so as to complete the packaging of the solar battery assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210962261.6A CN115172480A (en) | 2022-08-11 | 2022-08-11 | Solar cell module and method for manufacturing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210962261.6A CN115172480A (en) | 2022-08-11 | 2022-08-11 | Solar cell module and method for manufacturing same |
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| CN115172480A true CN115172480A (en) | 2022-10-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087885A1 (en) * | 2022-10-28 | 2024-05-02 | 天合光能股份有限公司 | Connection structure and method for solar cell string |
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- 2022-08-11 CN CN202210962261.6A patent/CN115172480A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087885A1 (en) * | 2022-10-28 | 2024-05-02 | 天合光能股份有限公司 | Connection structure and method for solar cell string |
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