CN112864265A - Hidden crack prevention photovoltaic stitch welding assembly and preparation process thereof - Google Patents
Hidden crack prevention photovoltaic stitch welding assembly and preparation process thereof Download PDFInfo
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- CN112864265A CN112864265A CN202110106418.0A CN202110106418A CN112864265A CN 112864265 A CN112864265 A CN 112864265A CN 202110106418 A CN202110106418 A CN 202110106418A CN 112864265 A CN112864265 A CN 112864265A
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- 238000003466 welding Methods 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 230000002265 prevention Effects 0.000 title claims description 24
- 238000003475 lamination Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 48
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 48
- 239000011521 glass Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000005357 flat glass Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 229910000679 solder Inorganic materials 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- 229920006124 polyolefin elastomer Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 73
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 36
- 238000001514 detection method Methods 0.000 description 17
- 238000010030 laminating Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009432 framing Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005401 electroluminescence Methods 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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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
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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
- H01L31/048—Encapsulation of modules
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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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides an anti-hidden-crack photovoltaic stitch welding assembly and a preparation process thereof, wherein the anti-hidden-crack photovoltaic stitch welding assembly comprises a battery string, a welding strip and a bearing layer, the battery string comprises a plurality of battery pieces arranged along the length direction of the anti-hidden-crack photovoltaic stitch welding assembly, the edges of the adjacent battery pieces are mutually overlapped to form a circular overlapped structure, the welding strip is inserted in the overlapped part between the adjacent battery pieces, the upper side and the lower side of the welding strip are respectively welded with the bottom surface of the battery piece with the raised end part in the adjacent battery piece and the top surface of the battery piece with the obliquely inserted end part and used for connecting the adjacent battery pieces to form the battery string, and the bearing layer is arranged on the upper side surface of the welding strip and is connected with the end part of the battery piece with the raised end part and/or on the lower side surface of the welding strip. According to the invention, the bearing layer with a specific thickness is arranged at a specific position, so that the bearing layer can bear and disperse pressure from outside to inside in a static state and fill a gap at the front end of the battery piece; when in lamination, the film is heated and softened to be converted into liquid and flows to the gaps of the battery pieces, thereby effectively avoiding subfissure.
Description
Technical Field
The invention relates to the technical field of solar photovoltaics, in particular to a hidden crack prevention photovoltaic stitch welding assembly and a preparation process thereof.
Background
With the rapid development of solar photovoltaic power generation technology, higher requirements are continuously put forward on the power generation efficiency of unit area, and a stitch welding technology for overlapping a part of front and back adjacent battery plates is developed to fully utilize the effective area. Specifically, the photovoltaic stitch-bonding assembly comprises a cell string, glass, an encapsulating adhesive layer, a bottom plate and the like, wherein the glass, the encapsulating adhesive layer and the bottom plate are arranged on two sides of the cell string, the cell string comprises a plurality of cell pieces, and adjacent cell pieces are electrically connected, specifically, the adjacent cell pieces are overlapped to realize the electrical connection, namely, an overlapping area exists between the adjacent cell pieces.
Specifically, the stitch welding process of the prior art includes: battery piece series welding → typesetting → EL 1 detection → laminating → EL2 detection → laminating → framing → wire-attaching box → EL 3 detection → power detection → grouping packaging → warehousing storage.
Wherein: the series welding of the battery pieces is to longitudinally stack and weld the battery pieces and the welding strips into a series in sequence; the typesetting is to place the turning battery strings on the panel glass paved with the EVA film; the EL 1 detection is to detect the welding quality by utilizing an electroluminescence principle; the lamination step comprises welding the bus bar, and placing the EVA film and the back plate/back plate glass; the EL2 detection is to detect the quality of the lamination by using the electroluminescence principle again; the lamination is to melt the EVA film at high temperature to realize cross-linking, and press the panel glass, the cell sheet layer and the back plate/back plate glass into a whole after cooling; the step of framing is to frame the laminated assembly to increase the protection function; the junction box is used for connecting the junction box with a battery circuit so as to realize electric energy output; EL 3 detection is to detect the lamination quality by using the electroluminescence principle again; the power detection is to carry out power and safety detection on the battery assembly; the grouping packaging and warehousing storage comprise grading packaging, and the protection component is convenient to transport and transport to a warehouse for storage.
However, in the stitch welding production of the solar cell module in the prior art, the overlapped part of the cell pieces is easy to crack after lamination, thereby affecting the power generation power and the service life of the module, being a pain point of the module stitch welding technology and greatly restricting the popularization and application of the stitch welding technology.
Specifically, as shown in fig. 1-4, in the stitch welding production, a part (about 0.2-0.6mm) of the front and rear 2 battery pieces is overlapped and connected in series through the welding strip to transmit current, but due to the existence of the welding strip, a gap is formed between the overlapped part of the front and rear battery pieces, and both ends of the battery piece are also provided with a gap, the gap bears the outward and inward pressure in the laminating process, and when the pressure cannot be received and released and exceeds the strength of the battery piece, the hidden crack phenomenon occurs.
Some anti-subfissure schemes are also disclosed and reported in the prior art, but the structure is relatively complex, the operation flow is inconvenient for large-scale production, the practical application prospect is poor, and how to provide the anti-subfissure photovoltaic stitch welding assembly which is simple in structure and simple and convenient in preparation process is a key technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a hidden crack prevention photovoltaic stitch welding assembly and a preparation process thereof, so as to thoroughly solve the adverse effects of hidden cracks on the power generation power and the service life, and simultaneously improve the operability and the industrialized production efficiency of the hidden crack prevention photovoltaic stitch welding assembly in practical application.
The invention adopts the following technical scheme:
a subfissure resistant photovoltaic stitch bonded assembly comprising:
the battery string comprises a plurality of battery pieces arranged along the length direction of the hidden crack prevention photovoltaic overlaying welding group, and the edges of the adjacent battery pieces are mutually overlapped to form a circular overlapping structure;
the welding strips are inserted at the overlapped part between the adjacent battery pieces and used for connecting the adjacent battery pieces to form a battery string;
bearing layer, bearing layer sets up weld the side of taking and with the end connection of the battery piece of tip perk, and/or bearing layer sets up weld the downside of taking and with the end connection of the battery piece that the tip inserted to one side.
The welding strips are obliquely inserted between the adjacent battery pieces, the upper sides of the welding strips are welded with the bottom surfaces of the battery pieces with the end portions of the adjacent battery pieces tilted, and the lower sides of the welding strips are welded with the top surfaces of the battery pieces with the end portions of the adjacent battery pieces obliquely inserted.
In the technical scheme, the battery string is composed of a plurality of battery packs which are serially connected along the length direction of the hidden crack prevention photovoltaic overlaying welding group, each battery pack comprises a first battery piece and a second battery piece, the left end of each second battery piece is obliquely inserted into the lower side of the right end of each first battery piece, the welding strip is arranged between the lower side of the right end of each first battery piece and the upper side of the left end of each second battery piece, and the first battery pieces and the second battery pieces are welded; the bearing layer sets up weld the side of taking and with the right-hand member portion of first battery piece is connected, and/or, the bearing layer sets up weld the downside of taking and with the left end connection of second battery piece.
In an embodiment of the invention, a bearing layer is arranged on the upper side of the welding strip close to the right end of the first battery piece and on the lower side of the welding strip close to the left end of the second battery piece.
In another embodiment of the invention, a bearing layer is arranged on the upper side of the solder strip close to the right end of the first battery piece.
In another embodiment of the invention, a bearing layer is arranged on the lower side surface of the welding strip close to the left end of the second battery piece.
Further, in the technical scheme, the thickness of the force bearing layer is 0.3-0.6mm thicker than that of the battery piece.
In detail, the thickness of the force bearing layer is related to the thickness of the battery piece, the thickness of the panel glass and the arrangement number of the force bearing layers, and the thickness of the force bearing layer is greater than the sum of the thickness of the battery piece and the thickness of the welding strip.
Specifically, in the technical scheme, the thickness of the battery piece is 0.16-0.22mm, and preferably 0.18 mm.
Specifically, in the above technical solution, the thickness of the force bearing layer is 0.45-0.65mm, preferably 0.55 mm.
Specifically, in the above technical solution, the thickness of the solder strip is 0.10-0.30mm, preferably 0.16-0.18 mm.
Still further, in the above technical solution, the force bearing layers are continuously or intermittently arranged in the battery string.
Still further, in the above technical solution, the cross section of the force bearing layer is any one or more of a rectangle, a circle, a triangle, a regular hexagon and an ellipse, and is preferably a rectangle and/or a circle.
In a specific embodiment of the invention, the force bearing layer extends along the width direction of the anti-subfissure photovoltaic overlaying welding group.
Still further, in the above technical solution, the hidden crack prevention photovoltaic stitch welding assembly further includes:
the EVA films are of a double-layer structure and are clamped at the top and the bottom of the battery string;
and the panel glass and the bottom plate are arranged on the outer side of the EVA film in a clamping mode.
Specifically, in the above technical solution, the bottom plate is one of a back plate or back plate glass.
In detail, the material of the bearing layer is one or more of ethylene-vinyl acetate copolymer (EVA film), polyolefin elastomer, and mixture of ethylene-vinyl acetate copolymer and filler.
In a preferred embodiment of the present invention, the material of the force-bearing layer is the same as the material of the EVA film.
The invention also provides a preparation process of the hidden crack prevention photovoltaic stitch welding component, which comprises the following steps:
after the battery pieces and the welding strips are stacked and welded into a string and placed on panel glass paved with an EVA film, a bus bar is welded, the upper side of the welding strips is close to the end portions of the battery pieces with the end portions tilted, and/or the lower side of the welding strips is close to the end portions of the battery pieces with the end portions obliquely inserted, a bearing layer is arranged, then the EVA film, a bottom plate and a junction box are placed, and lamination treatment is carried out.
Preferably, in the above technical solution, the method for arranging the bearing layer is one of spraying, coating and manual placement.
Further, in the above technical scheme, the lamination treatment includes that the battery string to be laminated is sequentially subjected to heating, vacuumizing and inflation pressing treatment, the bearing layer is heated and melted into a liquid state, and then the bearing layer is rapidly filled into a gap between the battery piece and the panel glass and the bottom plate in the vacuumizing process, and forms an integral structure with the battery piece, the EVA film, the panel glass and the bottom plate in the final inflation pressing treatment process.
Specifically, in the above technical solution, the laminator main body for lamination processing includes an upper cover, an adhesive film, a heating plate, a heating system, a vacuum system, a high temperature belt system, an auxiliary system, and the like.
Wherein, the heating temperature of the heating plate is 140-160 ℃, and the heat conduction mode is the temperature rise of the battery assembly.
Specifically, the method comprises the following specific steps:
placing a battery assembly to be laminated on a high-temperature-resistant belt, translating the battery assembly to the heating plate, and closing the upper cover and the lower cover onto the heating plate to form a closed volume, wherein the adhesive film is arranged between the upper cover and the assembly;
vacuumizing for 5-8min (most preferably 6min) by a vacuum system, exhausting air in the sealed volume and the battery assembly, wherein the EVA film and the bearing layer are gradually heated under heat conduction, and melt to 80 ℃ and melt to liquid state at 120 ℃ and gradually fill the space between the battery piece and the glass with the air extracted;
after vacuumizing, keeping vacuum for 10-12min (most preferably 10min), during which, air is gradually filled into the space between the adhesive film and the upper cover, the air pressure applies uniform pressure to the assembly through the adhesive film to force the panel glass, the crosslinked EVA film, the cell sheet layer and the back plate glass to be pressed together, and the EVA film after crosslinking reaction is gradually solidified into transparent colloid to bond the glass and the cell sheet layer into a whole;
and (3) filling air, lifting the upper cover, translating the high-temperature-resistant belt, moving the assembly to the outside of the laminating machine, and cooling in the air to obtain the laminated battery assembly.
In a specific embodiment of the invention, the preparation process of the subfissure-resistant photovoltaic stitch-welded assembly specifically comprises the following steps:
battery piece series welding → typesetting → EL 1 detection → lamination (adding a force bearing layer) → EL2 detection → lamination → framing → a wire attaching box → EL 3 detection → power detection → grouping and packaging → warehousing and storage.
Compared with the prior art, the method is only different in the step of laminating, the step of laminating specifically comprises the steps of arranging the bearing layer at a specific position after welding the bus bar, and then arranging the EVA film and the bottom plate, and other steps are similar to those in the prior art.
In the specific embodiment of the invention, the bearing layer and the EVA film are melted and crosslinked through lamination treatment, and are integrally bonded with the cell piece, the panel glass and the back plate/back plate glass.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the hidden crack prevention photovoltaic stitch welding assembly, the bearing layer with the specific thickness is arranged at the specific position (namely the upper side surface of the welding strip is close to the right end part of the first battery piece and/or the lower side surface of the welding strip is close to the left end part of the second battery piece), when the photovoltaic stitch welding assembly is in a static state, the bearing layer higher than the battery pieces can bear and disperse pressure from outside to inside, gaps at the front ends of the battery pieces are filled, and EVA (ethylene vinyl acetate) flowing paths are reduced and melted;
(2) the material of the added bearing layer of the hidden crack prevention photovoltaic stitch welding assembly is the same as that of the EVA film, and the bearing layer and the EVA film are melted and crosslinked together after lamination treatment is carried out, so that adverse effects are avoided;
(3) the hidden crack prevention photovoltaic stitch welding assembly provided by the invention can effectively eliminate hidden cracks and reduce the thickness of the EVA film by 10-15% by arranging the bearing layer, so that the production cost is further reduced;
(4) the force bearing layer of the hidden crack prevention photovoltaic stitch welding assembly is arranged in a spraying, coating or manual placement mode, the force bearing layer is arranged on the upper side face of the welding strip and close to the right end portion of the first battery piece and/or the lower side face of the welding strip and close to the left end portion of the second battery piece, hidden cracks can be prevented, the probability of the hidden cracks is reduced to be less than one thousandth, the hidden crack prevention photovoltaic stitch welding assembly has the advantage of convenience in operation, can be implemented on the basis of the existing production line, and is strong in operability and excellent in practical application effect.
Drawings
FIG. 1 is a schematic structural diagram of a photovoltaic stitch-bonded assembly in the prior art;
FIG. 2 is a cross-sectional schematic view of a photovoltaic stitch-bonded assembly after lamination processing in the prior art;
FIG. 3 is a photograph of a sample of a prior art photovoltaic stitch bonded assembly (without a bearing layer applied);
FIG. 4 is an EL photograph of a prior art (without a bearing layer) photovoltaic stitch-bonded assembly after lamination;
FIG. 5 is a schematic structural view of a photovoltaic stitch bonded assembly prepared in example 1 of the present invention;
fig. 6 is a schematic cross-sectional structure of a photovoltaic stitch-bonded assembly prepared in example 1 of the present invention after lamination;
fig. 7 is a schematic structural view in longitudinal section of a photovoltaic stitch-bonded module prepared in example 1 of the present invention after a lamination process;
FIG. 8 is a photograph of a sample of a photovoltaic stitch bonded assembly made in example 1 of the present invention;
FIG. 9 is an EL photograph of a photovoltaic stitch bonded assembly prepared in example 1 of the present invention after lamination treatment;
fig. 10 is a schematic structural view of a photovoltaic stitch-bonded module prepared in example 2 of the present invention;
fig. 11 is a schematic structural view of a photovoltaic stitch-bonded module prepared in example 3 of the present invention;
in the figure:
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.
The following examples are given for the purpose of illustration only and are not intended to limit the scope of the invention.
All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.
In the examples of the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the examples of the present invention, unless otherwise specified, all technical means used are conventional means well known to those skilled in the art.
In the present embodiments, the terminology used is for the purpose of describing particular embodiments only and is not intended to be limiting; in particular, as used in the specification and claims of this application, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be noted that the term "and/or" used in the specification of the present application is only one kind of association relation describing an associated object, and means that three kinds of relations may exist, for example: a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone.
In addition, the character "/" used in the specification of the present application generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left" and "right" used in the specification of the present application are described with respect to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application; in addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
In the stitch welding production operation of the cell of the photovoltaic stitch welding assembly in the prior art, as shown in fig. 1-2, two adjacent front and back cells are overlapped by 0.2-0.6mm and are connected in series through a welding strip to transmit current; however, as shown in fig. 3, due to the existence of the solder strip, a gap exists between the overlapping portion of the two adjacent battery pieces and the end portion of the two adjacent battery pieces, and further, as shown in fig. 4, the gap is subjected to an outward-inward pressure during the lamination process, and if the pressure cannot be effectively received and released, a large number of cracks (obvious cracks shown in fig. 4) occur when the strength of the battery pieces is exceeded.
On the basis of not changing the design and materials of the photovoltaic stitch welding assembly in the prior art, the force bearing layer is additionally arranged on the top and/or the bottom of the welding strip and the periphery of the end part of the cell, specifically, the force bearing layer is arranged on the upper side of the welding strip and connected with the end part of the cell with the raised end part, and/or the force bearing layer is arranged on the lower side of the welding strip and connected with the end part of the cell with the obliquely inserted end part, so that the overlapped part and the gap of the two adjacent front and rear cells are shared to bear pressure in the lamination process, and the aim of preventing hidden cracks is fulfilled.
Specifically, in the specific implementation mode of the invention, the thickness of the added bearing layer is 0.3-0.6mm thicker than that of the battery piece.
Example 1
In the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention, as shown in fig. 5, the assembly mainly comprises a battery string, a welding strip 5 and a receiving layer 3.
Specifically, the battery string comprises a plurality of battery packs which are arranged in series along the length direction of the hidden crack prevention photovoltaic overlaying welding group, each battery pack comprises a first battery piece 4 and a second battery piece 6, the left end of each second battery piece 6 is obliquely inserted into the lower side of the right end of each first battery piece 4, and the battery packs consisting of the first battery pieces 4 and the second battery pieces 6 are mutually overlapped to form a circular overlapping structure; the welding strip 5 is obliquely inserted between the first battery piece 4 and the second battery piece 6, the upper side of the welding strip is welded with the bottom surface of the battery piece with the tip tilted in the adjacent battery piece, and the lower side of the welding strip is welded with the top surface of the battery piece with the tip obliquely inserted in the adjacent battery piece, so that the adjacent battery pieces are connected to form a battery string; the bearing layer 3 is arranged on the upper side face of the welding strip 5 and connected with the end part of the right end part of the first battery piece 4.
Specifically, the force bearing layer 3 extends along the width direction of the hidden crack prevention photovoltaic overlaying welding group.
Specifically, the force bearing layers 3 are continuously arranged in the battery string.
Further, the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention further comprises two-layer-structured EVA films (including a top EVA film 2 and a bottom EVA film 7) arranged at the top and the bottom of the battery string, and a panel glass 1 and a back panel 8 arranged at the outer side of the EVA films.
In this embodiment, the thickness of the battery piece is 0.22mm, and the thickness of the receiving layer is 0.64 mm; the thickness of the solder strip is 0.15 mm.
In this embodiment, the receiving layer 3 has a cross section of one of a rectangular shape, a circular shape, a regular hexagonal shape, and an oval shape.
In this embodiment, the receiving layer 3 is made of the same material as the EVA film, specifically one of ethylene-vinyl acetate copolymer, polyolefin elastomer, and a mixture of ethylene-vinyl acetate copolymer and a filler.
Compared with the preparation process of the photovoltaic stitch welding assembly in the prior art, the preparation process of the hidden crack prevention photovoltaic stitch welding assembly provided by the embodiment is different in that the cell and the welding strip are stacked and welded into a string and placed on the panel glass paved with the EVA film, after the bus bar is welded, the bearing layer is arranged on the upper side of the welding strip and close to the end part of the cell with the raised end part, then the EVA film and the back plate glass are placed, and the lamination treatment is carried out.
The preparation process comprises the following specific steps: the method comprises the following steps of battery piece series welding → typesetting → EL 1 detection → lamination (adding a force bearing layer) → EL2 detection → lamination → framing → a wire attaching box → EL 3 detection → power detection → grouping and packaging → warehousing and storage, and the rest steps are similar to those in the prior art and are not repeated.
In detail, the method for laying the bearing layer is simple and controllable, and can be carried out by any one of spraying, coating and manual placement.
It is important to point out that the lamination processing steps include that the battery string to be laminated is sequentially heated, vacuumized and inflated to press down, the bearing layer is heated and melted into liquid state, then the bearing layer is rapidly filled into the gap between the battery piece and the panel glass and the bottom plate in the vacuumization process, and finally the bearing layer and the battery piece, the EVA film, the panel glass and the bottom plate form an integral structure in the inflated pressing down processing process.
In detail, the lamination process is performed on a laminator whose main structure includes an upper cover, an adhesive film, a heating plate, a heating system, a vacuum system, a high temperature belt system, an auxiliary system, etc., wherein the heating plate is controlled to have a heating temperature of 140-160 ℃ by raising the temperature of the battery assembly.
In detail, the steps of the specific lamination process include:
vacuumizing for 6min by a vacuum system, exhausting air in the sealed volume and the battery assembly, wherein the EVA film and the bearing layer are gradually heated under heat conduction, and melt at 80 ℃ and melt at 120 ℃ to form liquid, and the liquid is gradually filled into the space between the battery piece and the glass, from which the air is extracted;
after vacuumizing, keeping vacuum for 10min, wherein the glue film is gradually filled with air in the space between the upper cover, the air pressure applies uniform pressure to the assembly through the glue film to force the panel glass, the crosslinked EVA film, the cell sheet layer and the back plate glass to be pressed together, and the EVA film after crosslinking reaction is gradually solidified into transparent colloid to bond the glass and the cell sheet layer into a whole;
filling air, lifting the upper cover, translating the high-temperature-resistant belt, moving the assembly to the outside of the laminating machine, and cooling in the air to obtain a laminated battery assembly (shown in figures 6-8).
And (3) melting and crosslinking the bearing layer and the EVA film through lamination treatment, and bonding the bearing layer and the EVA film with the cell piece, the panel glass and the back plate/back plate glass into a whole.
In the embodiment, the bearing layer of 0.64mm is continuously arranged on the upper side surface of the welding strip and at the connecting position with the end part of the right end part of the first battery piece, in a static state, the bearing layer which is about 0.42mm higher than the cell slice can bear and disperse the pressure from outside to inside, fill the gap at the front end of the cell slice, reduce the flow path of the molten EVA, in the lamination treatment, the bearing layer is heated and softened at about 80 ℃ and gradually changed into liquid state, and flows to the gap of the cell under the action of pressure, thereby playing the role of supporting the cell, the other liquid materials which do not flow in bear partial pressure at the periphery of the overlapping part and objectively share the pressure applied to the battery piece at the overlapping part, and the hidden crack is effectively avoided, as shown in fig. 9, the probability of the hidden crack is reduced to 1.5 per thousand, which is obviously lower than that of the hidden crack in the prior art (about 5-12%) shown in fig. 4.
Example 2
In the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention, the structure is shown in fig. 10, and the assembly mainly comprises a battery string, a welding strip and a bearing layer.
Specifically, the structure of the hidden crack prevention photovoltaic stitch welding assembly is similar to that of the hidden crack prevention photovoltaic stitch welding assembly provided by embodiment 1, and the difference is that a force bearing layer is connected to both the right end part, close to the first battery piece, of the upper side of the welding strip and the left end part, close to the second battery piece, of the lower side of the welding strip.
In this embodiment, the thickness of the battery piece is 0.18mm, and the thickness of the receiving layer is 0.55 mm; the thickness of the solder strip is 0.30 mm.
The preparation process of the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention is similar to that of the embodiment 1, and the difference is only in the arrangement position and the arrangement time of the bearing layer, and the specific process is not repeated herein, and multiple experiments prove that the subfissure generation probability of the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention is reduced to 1.0 per thousand, which is obviously lower than that in the prior art (about 5-12%) shown in fig. 4.
Example 3
In the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention, the structure is shown in fig. 11, and the assembly mainly comprises a battery string, a welding strip and a bearing layer.
Specifically, the structure of the subfissure-resistant photovoltaic stitch welding assembly is similar to that of the subfissure-resistant photovoltaic stitch welding assembly provided by the embodiment 1, and the difference is only that a force bearing layer is arranged on the lower side surface of the welding strip close to the left end part of the second cell slice.
In this embodiment, the thickness of the battery piece is 0.16mm, and the thickness of the receiving layer is 0.45 mm; the thickness of the solder strip is 0.18 mm.
The preparation process of the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention is similar to that of the embodiment 1, and the difference is only in the arrangement position and the arrangement time of the bearing layer, and the specific process is not repeated herein, and multiple experiments prove that the subfissure generation probability of the subfissure-prevention photovoltaic stitch welding assembly provided by the embodiment of the invention is reduced to 1.5 per thousand, which is obviously lower than that in the prior art (about 5-12%) shown in fig. 4.
Finally, the structures and methods of the present invention are merely preferred embodiments, and are not intended to limit the scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hidden crack prevention photovoltaic stitch welding component is characterized in that,
the method comprises the following steps:
the battery string comprises a plurality of battery pieces arranged along the length direction of the hidden crack prevention photovoltaic overlaying welding group, and the edges of the adjacent battery pieces are mutually overlapped to form a circular overlapping structure;
the welding strip is inserted at the overlapping position between the adjacent battery pieces, the upper side of the welding strip is welded with the bottom surfaces of the battery pieces with the end parts tilted in the adjacent battery pieces, and the lower side of the welding strip is welded with the top surfaces of the battery pieces with the end parts obliquely inserted in the adjacent battery pieces and is used for connecting the adjacent battery pieces to form a battery string;
bearing layer, bearing layer sets up weld the side of taking and with the end connection of the battery piece of tip perk, and/or bearing layer sets up weld the downside of taking and with the end connection of the battery piece that the tip inserted to one side.
2. The subfissure-resistant photovoltaic stitch-bonded assembly according to claim 1,
the battery string is composed of a plurality of battery packs which are arranged in series along the length direction of the hidden crack prevention photovoltaic overlaying welding group, each battery pack comprises a first battery piece and a second battery piece, the left end of each second battery piece is obliquely inserted into the lower side of the right end of each first battery piece, the welding strip is arranged between the lower side of the right end of each first battery piece and the upper side of the left end of each second battery piece, and the first battery pieces and the second battery pieces are welded;
the bearing layer sets up weld the side of taking and with the right-hand member portion of first battery piece is connected, and/or, the bearing layer sets up weld the downside of taking and with the left end connection of second battery piece.
3. The subfissure-resistant photovoltaic stitch welding assembly according to claim 1 or 2,
the thickness of the bearing layer is 0.3-0.6mm thicker than that of the battery piece.
4. The subfissure-resistant photovoltaic stitch-bonded assembly according to claim 3,
the thickness of the battery piece is 0.16-0.22mm, preferably 0.18 mm;
and/or the thickness of the bearing layer is 0.45-0.65mm, preferably 0.55 mm;
and/or the thickness of the solder strip is 0.10-0.30mm, preferably 0.16-0.18 mm.
5. The subfissure-resistant photovoltaic stitch-bonded assembly according to claim 1,
the bearing layers are continuously arranged or arranged at intervals in the battery string;
and/or the cross section of the bearing layer is any one or more of rectangle, circle, triangle, regular hexagon and ellipse, preferably rectangle and/or circle.
6. The subfissure-resistant photovoltaic stitch welding assembly according to claim 1 or 2,
the bearing layer extends along the width direction of the hidden crack prevention photovoltaic overlaying welding group.
7. The subfissure-resistant photovoltaic stitch-bonded assembly according to any one of claims 1 to 6,
further comprising:
the EVA films are of a double-layer structure and are clamped at the top and the bottom of the battery string;
the panel glass and the bottom plate are clamped on the outer side of the EVA film;
preferably, the bottom plate is a back plate or back plate glass.
8. The subfissure-resistant photovoltaic stitch welding assembly according to claim 7,
the bearing layer is made of one or more of ethylene-vinyl acetate copolymer, polyolefin elastomer, and a mixture of ethylene-vinyl acetate copolymer and filler;
preferably, the material of the bearing layer is the same as that of the EVA film.
9. A preparation process of a hidden crack prevention photovoltaic stitch welding component is characterized in that,
comprises the steps of (a) preparing a mixture of a plurality of raw materials,
after the battery pieces and the welding strips are stacked and welded into a string and placed on the panel glass paved with the EVA film, welding a bus bar, arranging a bearing layer on the upper side surface of the welding strips and the end part close to the battery piece with the end part raised, and/or arranging a bearing layer on the lower side surface of the welding strips and the end part close to the battery piece with the end part obliquely inserted, and then placing the EVA film, the bottom plate and the junction box, and performing lamination treatment;
preferably, the arrangement method of the bearing layer is one of spraying, coating and manual placement.
10. The preparation process of the subfissure-resistant photovoltaic stitch-welded assembly according to claim 9,
the lamination treatment comprises the steps that the battery string to be laminated is sequentially subjected to heating, vacuumizing and inflation pressing treatment, the bearing layer is heated and melted into a liquid state, then the bearing layer is rapidly filled into gaps among the battery piece, the panel glass and the bottom plate in the vacuumizing process, and the bearing layer, the battery piece, the EVA film, the panel glass and the bottom plate form an integral structure in the final inflation pressing treatment process.
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