CN113644153A - Photovoltaic module and preparation process thereof - Google Patents
Photovoltaic module and preparation process thereof Download PDFInfo
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- CN113644153A CN113644153A CN202110932128.1A CN202110932128A CN113644153A CN 113644153 A CN113644153 A CN 113644153A CN 202110932128 A CN202110932128 A CN 202110932128A CN 113644153 A CN113644153 A CN 113644153A
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- 238000002360 preparation method Methods 0.000 title abstract description 7
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 44
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- 239000000463 material Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 11
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 238000005538 encapsulation Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
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- 238000010030 laminating Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 4
- 238000010248 power generation Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000002902 organometallic compounds Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 229910052751 metal Inorganic materials 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
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/049—Protective back sheets
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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
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
-
- 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
-
- 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
- Y02E10/52—PV systems with concentrators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic module and a preparation process thereof. This photovoltaic module includes: the battery pack comprises a glass cover plate, a packaging adhesive film, a battery string with an overlapped area between battery pieces, a light reflecting part, a light reflecting bus bar and a light transmitting back plate, wherein the packaging adhesive film is used for packaging the battery string between the glass cover plate and the light transmitting back plate; the light reflecting component is arranged on the main surface of the light-transmitting back plate, which is in contact with the packaging adhesive film; the light reflecting part corresponds to a gap between two adjacent battery strings or corresponds to a gap between the battery strings and the edge of the light-transmitting back plate; the light reflecting bus bar is arranged at the end part of the battery string and is used for connecting a plurality of battery strings in series and/or in parallel and reflecting light rays for the battery strings. The photovoltaic module can improve the generated energy.
Description
Technical Field
The invention relates to a photovoltaic module and a preparation process thereof.
Background
Nowadays, double-sided photovoltaic modules capable of improving power generation benefits are more and more favored by the market. The existing double-sided photovoltaic module mainly adopts the white reflective material to coat or fill the white reflective material between the cell strings and between the cell sheets, so that the light rays entering between the cell strings or between the cell sheets are reflected to the interface of the glass cover plate contacting with air through the white reflective material, and then the interface reflects the reflected light to the surface of the cell, so as to increase the photoelectric conversion efficiency of the front side of the double-sided photovoltaic module.
According to the existing double-sided photovoltaic module, the white reflective materials positioned between the cell pieces can shield the back of the cell pieces, so that the generated energy of the back of the photovoltaic module is low.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a photovoltaic module and a manufacturing process thereof, which can effectively improve the power and the power generation amount of the back side of a cell in a double-sided photovoltaic module, so as to improve the power and the power generation amount of the double-sided photovoltaic module.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a photovoltaic module comprising: a glass cover plate, a packaging adhesive film, a battery string with an overlapped area among the battery pieces, a light reflecting component, a light reflecting bus bar and a light transmitting back plate, wherein,
the packaging adhesive film is used for packaging the battery string between the glass cover plate and the light-transmitting back plate;
the light reflecting component is arranged on the main surface of the light-transmitting back plate, which is in contact with the packaging adhesive film;
the light reflecting component corresponds to a gap between two adjacent battery strings or corresponds to a gap between the battery strings and the edge of the light-transmitting back plate;
the light-reflecting bus bar is arranged at the end part of the battery string and is used for connecting the battery string in series and/or in parallel and reflecting light rays for the battery string.
In a second aspect, the present invention provides a process for preparing a photovoltaic module, comprising:
arranging a light reflecting part on a light-transmitting back plate, wherein the position of the light reflecting part on the light-transmitting back plate corresponds to a gap between two adjacent battery strings or corresponds to a gap between the battery string and the edge of the light-transmitting back plate;
step (b), laying a packaging adhesive film on the glass cover plate, and laying the battery strings with the overlapped areas and the light-reflecting bus bars on the packaging adhesive film;
and (c) further paving a packaging adhesive film on the battery string and the reflective bus bar, covering the transparent back plate on the packaging adhesive film, and laminating.
The technical scheme of the first aspect of the invention has the following advantages or beneficial effects: in the photovoltaic module provided by the embodiment of the invention, because the overlapping area exists between the battery pieces in the battery string, the light transmission between the battery pieces can be avoided, compared with the conventional double-sided module, the transverse light-reflecting part is cancelled, the transverse light shielding of the battery pieces on the back of the module is eliminated, and the power generation of the battery on the back is improved, however, the light transmission exists at the edge of the battery at the end part of the string, so that the power generation of the end battery is reduced, at the moment, the light-reflecting bus bar for connecting a plurality of battery strings in series and/or in parallel is arranged at the end part of the battery string, the light-reflecting bus bar can fill the gap between the end part of the battery string and the edge of the back plate, and has the capability of reflecting the light in the non-battery piece area at the end part and the edge of the back plate to the surface of the battery, so as to increase the light intensity of the front and the back of the end battery, compared with the prior art, when the power generation of the front of the photovoltaic module is improved, the light receiving area of the back of the cell is increased, the generated energy of the back of the photovoltaic module can be effectively improved, and the generated energy of the photovoltaic module is effectively improved.
In addition, the electric power of each cell can be improved and balanced through the light reflecting part and the light reflecting bus bar, so that the improvement of the whole electric power of the photovoltaic module is ensured.
Drawings
Fig. 1A is a schematic view of a backsheet of a prior art double-sided photovoltaic module;
FIG. 1B is a schematic diagram of a prior art double-sided photovoltaic module;
fig. 2 is a schematic cross-sectional view of a photovoltaic module according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a photovoltaic module according to another embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a photovoltaic module according to yet another embodiment of the present invention;
FIG. 5 is a schematic view of a light-transmissive backplane according to an embodiment of the present invention;
FIG. 6A is a schematic illustration of a cross-section of a light reflecting bus bar according to one embodiment of the present invention;
FIG. 6B is a plan view of a light reflecting bus bar according to one embodiment of the present invention;
FIG. 6C is a plan view of a light reflecting bus bar according to one embodiment of the present invention;
FIG. 7 is a schematic illustration of a cross-section of a light reflecting bus bar according to another embodiment of the present invention;
FIG. 8 is a schematic view of a cross-section of a light reflecting bus bar according to yet another embodiment of the present invention;
FIG. 9 is a schematic view of the relationship between a light reflecting bus bar and a retroreflective layer according to an embodiment of the present invention;
FIG. 10 is a schematic view of the relationship between a light reflecting bus bar and a front light reflecting layer according to an embodiment of the present invention;
FIG. 11 is a schematic view of a cross-section of a light reflecting bus bar according to another embodiment of the present invention;
FIG. 12 is a cross-sectional view of yet another light reflecting bus bar, according to an embodiment of the present invention;
FIG. 13 is a top view of a bus bar according to an embodiment of the present invention;
FIG. 14 is a diagram illustrating the relative positioning of a light reflecting bus bar and a light reflecting member in accordance with an embodiment of the present invention;
fig. 15 is a schematic main flow diagram of a process for manufacturing a photovoltaic module according to an embodiment of the present invention;
FIG. 16 is a schematic view of a double-sided reflective bus bar reflective path according to an embodiment of the present invention.
The reference numbers are as follows:
11 glass cover plate 12 packaging adhesive film
13 battery string 131 battery piece
14 reflecting parts
141 intermediate region of the light-reflecting component
142 edge region of a light-reflecting component
15 reflective bus bar
151 groove 152 first reflective film
153 bus bar 154 second reflective film
155 intermediate junction region
156 terminal bus region
16 light-transmitting back plate
Main surface in contact with packaging adhesive film in 161 light-transmitting back plate
162 first edge of light-transmissive back-plate
Second edge of 163 light-transmitting backsheet
14' reflecting material
16' glass backplane of the prior art
17 back reflecting film
18 front reflecting film
19 terminal box
Detailed Description
In order to increase the electric power of the front side of the double-sided photovoltaic module, as shown in fig. 1A, a reflective material 14' is disposed on the glass back sheet 16' at a position corresponding to the gap between the cell sheets, the gap between the cell strings, and the gap between the end of the cell string and the edge of the glass back sheet 16 '. Fig. 1A illustrates a schematic structural diagram of the back surface of the double-sided photovoltaic module shown in fig. 1B, which can be seen from fig. 1B, where on the glass back sheet 16', the width of the reflective material 14' is set to be greater than the gap between the battery pieces 131 and the gap between the end of the battery string and the edge of the back sheet, corresponding to the positions of the gap between the battery pieces 131 and the gap between the end of the battery string and the edge of the back sheet, so as to shield the edge of the back surface of the battery piece 131, reduce the light receiving area of the back surface of the battery piece 131, and reduce the power generation amount of the back surface of the photovoltaic module. Resulting in a lower overall power production of the photovoltaic module.
In the following description and in the appended claims, the front side of any structure in a photovoltaic module refers to the major surface of the structure that faces sunlight during use of the photovoltaic module, and the back side of any structure in a photovoltaic module refers to the major surface of the structure that faces away from sunlight during use of the photovoltaic module. For example, the front surface of the cell sheet refers to the major surface of the cell sheet facing sunlight, and the back surface of the cell sheet refers to the major surface of the cell sheet facing away from sunlight.
The white reflecting material may have one or more of titania, silica, zirconia, alumina, zinc oxide, etc. as main component and has reflecting film formed on glass. The white light reflecting material may be formed on the glass by a method known to those skilled in the art, such as dry coating or wet coating.
The photovoltaic module provided by the embodiment of the invention is a double-sided photovoltaic module, namely, both the glass cover plate 11 and the light-transmitting back plate 16 can transmit light, wherein light entering from the glass cover plate 11 reaches the front sides of the cells in the cell strings 13, and light entering from the light-transmitting back plate 16 reaches the back sides of the cells in the cell strings 13. A schematic diagram of a partial cross-sectional structure of a photovoltaic module as shown in fig. 2 to 4. Fig. 2 and 3 are partial cross-sectional views of the photovoltaic module along the extending direction of the cell strings, wherein the cell string 13 shown in fig. 2 is a shingled cell string, and the cell string 13 shown in fig. 3 is a stitch-welded cell string. Fig. 4 is a cross-sectional view in a direction perpendicular to the extending direction of the battery string. As can be seen from fig. 2 to 4, the photovoltaic module provided by the embodiment of the present invention includes: the solar cell module comprises a glass cover plate 11, a packaging adhesive film 12, a cell string 13 with an overlapping region (an overlapping region formed in a tiling or overlapping manner, for example, a part of one cell overlaps a part of another cell), a light reflecting component 14, a light reflecting bus bar 15 and a light-transmitting back plate 16, wherein the packaging adhesive film 12 is used for packaging the cell string 13 between the glass cover plate 11 and the light-transmitting back plate 16. As shown in fig. 4 and 5, the light reflecting member 14 is disposed on the main surface 161 of the light-transmissive back sheet 16 that is in contact with the encapsulating adhesive film 12; the light reflecting member 14 corresponds to a gap between two adjacent battery strings 13 or a gap between the battery strings 13 and the edge of the light-transmitting back sheet 16. As shown in fig. 2, 3 and 14, a light reflecting bus bar 15 is provided at an end of the battery string 13, for connecting the plurality of battery strings 13 in series and/or in parallel, and reflecting light for the battery strings 13. As shown in fig. 5, the main surface 161 of the light-transmissive back plate 16 contacting the encapsulant film 12 is substantially the front surface of the light-transmissive back plate 16. It is to be understood that since fig. 2 and 3 show cross-sectional views along the extending direction of the cell strings, the light reflecting members 14 corresponding to the space between two adjacent cell strings 13 or the space between the cell strings 13 and the edge of the light-transmissive back sheet 16 are not shown. Since fig. 4 shows a cross-sectional view in a direction perpendicular to the extending direction of the battery string, the light reflecting bus bar 15 at the end of the battery string 13 is not shown.
The light-transmitting back plate 16 may be a transparent polymer back plate or a glass back plate. In a preferred embodiment, the light-transmissive backplane 16 is a glass backplane. The bus bar refers to a conductive metal strip that collects current of the cell string and is connected to a junction box of the photovoltaic module. The light reflecting property of the bus bar generally used in the art is poor, and the light reflecting bus bar in the present invention means a bus bar having a light reflecting coating or a light reflection enhancing treatment. For example, a composition containing a binder, an inorganic film-forming material, and a solvent may be applied to a bus bar by a dry coating method or a wet coating method, and cured. The inorganic film-forming material may include one or more of titanium dioxide, silicon dioxide, zirconium oxide, aluminum oxide, zinc oxide, and the like, and the binder may include organic matters or colloids produced from organic salts, inorganic salts, and metal organic compounds as raw materials. The bonding property of the reflective material and the light-transmitting high polymer back plate or the glass back plate is ensured, and meanwhile, the reflective material has better reflective property.
It should be noted that the battery string 13 may be a shingled battery string as shown in fig. 2, or may be a stitch-welded battery string as shown in fig. 3. Through selecting this shingled battery cluster or stitch-welded battery cluster, can not have the space between the battery piece, consequently, then need not to set up reflection of light part or reflecting material between the battery piece to reduce the area of sheltering from of reflection of light part or reflecting material to the battery piece back, improve the photic area of battery piece back.
As shown in fig. 5, a plurality of light reflecting members 14 are distributed in parallel along the extending direction of the battery string 13 on the main surface 161 of the light-transmissive back sheet 16. The position of the plurality of light reflecting members 14 on the light-transmissive backsheet 16 corresponds to the spacing between the strings of cells and the first edge 162 of the light-transmissive backsheet 16. It should be noted that the first edge 162 of the light-transmitting back plate 16 is an edge parallel to the extending direction of the battery string 13. By distributing the plurality of light reflecting members 14 in parallel on the main surface of the light-transmitting back plate 16, sunlight can be prevented from penetrating through gaps between the cell strings 14 and the first edge 162 of the light-transmitting back plate 16, and simultaneously, sunlight on the front side of the photovoltaic module can be reflected to the front side of the cell, and sunlight on the back side of the photovoltaic module can be reflected to the back side of the cell, so that the power generation amount of the photovoltaic module can be effectively improved. As can be seen from the relative position relationship between the light reflecting member 14 and the cell string 13 shown in the cross-sectional view of the photovoltaic module shown in fig. 4, the middle region 141 of the light reflecting member 14 overlaps with the gap; the edge region 142 of the light reflecting member 14 overlaps the edge of the adjacent cell string 13. The edge of the battery string 13 refers to an edge along the extending direction of the battery string.
The light reflecting member 14 may be formed by coating a composition including a binder, an inorganic film-forming material, and a solvent on the back sheet by a dry coating method or a wet coating method, and curing the composition. The inorganic film-forming material may include one or more of titanium dioxide, silicon dioxide, zirconium oxide, aluminum oxide, zinc oxide, and the like, and the binder may include organic matters or colloids produced from organic salts, inorganic salts, and metal organic compounds as raw materials. The bonding property of the reflective material and the light-transmitting high polymer back plate or the glass back plate is ensured, and meanwhile, the reflective material has better reflective property.
As shown in fig. 2 or fig. 3, the light reflecting bus bar 15 is disposed at the end of the cell string 13, and can block sunlight shown in fig. 5 from passing through the gap between the end of the cell string 13 and the second edge 163 of the back plate 16, and in addition, when the ends of the two cell strings 13 are oppositely disposed, the light reflecting bus bar 15 can also block sunlight from passing through the gap between the ends of the two oppositely disposed cell strings 13, and at the same time, the light reflecting bus bar 15 can reflect light to the cells in the cell strings, so as to further improve the power generation amount of the photovoltaic module.
Among them, the light reflecting bus bar may have various structures, as shown in fig. 6 to 8 and 11:
in the embodiment of the present invention, as shown in the cross-sectional view of the light reflecting bus bar of fig. 6A, a plurality of grooves 151 are arranged on the front surface of the light reflecting bus bar 15. In the plan views of the light reflecting bus bar shown in fig. 6B and 6C, the grooves 151 may extend along the length direction of the light reflecting bus bar 15, and the grooves 151 may be arranged in a direction forming an angle with the width direction of the front surface of the light reflecting bus bar 15. I.e., the angle between the extending direction of the groove 151 and the front width direction of the light reflecting bus bar 15 is not 0. In addition, the cross section of the groove 151 may be an inverted triangle, an approximately inverted triangle, or an inverted trapezoid structure, wherein the vertex of the approximately inverted triangle embedded inside the light-reflecting bus bar 15 may be a circular arc, a tooth, or the like. The direction of sunlight reflected by the reflecting bus bar can be effectively controlled through the design of the grooves on the front surface, so that light reflected by the reflecting bus bar can be reflected to the front surface of the cell as far as possible.
In the embodiment of the present invention, as shown in fig. 7, which is a cross-sectional view of the light reflecting bus bar, a plurality of grooves 151 are arranged on the rear surface of the light reflecting bus bar 15. It should be noted that the grooves 151 may be arranged on the back surface of the light reflecting bus bar 15 as shown in fig. 6B and 6C, the grooves 151 may extend along the length direction of the light reflecting bus bar 15, and the grooves 151 may be arranged along the direction forming an angle with the width direction of the back surface of the light reflecting bus bar 15. I.e., the angle between the extending direction of the groove 151 and the width direction of the rear surface of the light reflecting bus bar 15 is not 0. In addition, the cross section of the groove 151 disposed on the back surface of the light reflecting bus bar 15 may also be an inverted triangle, an approximately inverted triangle, or an inverted trapezoid structure, wherein the vertex embedded inside the light reflecting bus bar 15 in the approximately inverted triangle may be a circular arc, a tooth, or other structures. The direction of sunlight transmitted by the light-transmitting back plate can be effectively controlled by the design of the groove on the back surface, so that light reflected by the light-reflecting bus bar can be reflected to the back surface of the cell piece as far as possible.
In a preferred embodiment, as shown in fig. 8, which is a cross-sectional view of the light reflecting bus bar, the light reflecting bus bar 15 has a plurality of grooves 151 arranged on the front and back surfaces thereof, it should be noted that the grooves 151 may also be arranged on the front and back surfaces of the light reflecting bus bar 15 as shown in fig. 6B and 6C, the grooves 151 may extend along the length direction of the light reflecting bus bar 15, and the grooves 151 may also be arranged along a direction forming an angle with the width direction of the light reflecting bus bar 15. Wherein the arrangement directions of the grooves 151 on the front and back surfaces of the light reflecting bus bar 15 are not affected by each other. For example, the groove 151 of the front surface of the light reflecting bus bar 15 may extend in the length direction of the light reflecting bus bar 15, and the groove 151 of the rear surface of the light reflecting bus bar 15 may extend in the length direction of the light reflecting bus bar 15. For another example, the grooves 151 of the front surface of the light reflecting bus bar 15 may extend along the length direction of the light reflecting bus bar 15, and the grooves 151 of the rear surface of the light reflecting bus bar 15 may be arranged in a direction forming an angle with the width direction of the rear surface of the light reflecting bus bar 15. For example, the grooves 151 on the front surface of the light reflecting bus bar 15 are arranged in a direction forming an angle with the width direction of the light reflecting bus bar 15, and the grooves 151 on the back surface of the light reflecting bus bar 15 may extend in the length direction of the light reflecting bus bar 15, etc. That is, the groove 151 has an angle between the extending direction of the front and rear surfaces of the light reflecting bus bar 15 and the width direction of the rear surface of the light reflecting bus bar 15 different from 0. In addition, the cross section of the groove 151 disposed on the front and back of the light reflecting bus bar 15 may also be an inverted triangle, or an approximately inverted triangle, or an inverted trapezoid structure, wherein the vertex embedded inside the light reflecting bus bar 15 in the approximately inverted triangle may be a circular arc, a tooth, or other structures. It is understood that the cross-sectional structures of the grooves 151 formed on the front and rear surfaces of the light reflecting bus bar 15 may be different or the same, and are not limited herein.
In an embodiment of the present invention, regarding the structure of the light reflecting bus bar 15 shown in fig. 6A, that is, a plurality of grooves are arranged on the front surface of the light reflecting bus bar 15, and the back surface of the light reflecting bus bar 15 is a planar structure, the photovoltaic module may further include: and a back surface reflection film 17 disposed on the back surface of the light reflection bus bar 15 to effectively improve the power generation amount on the back surface of the photovoltaic module, wherein the relationship between the light reflection bus bar 15 and the back surface reflection film 17 can be shown in fig. 9.
In an embodiment of the present invention, regarding the structure of the light reflecting bus bar 15 shown in fig. 7, that is, a plurality of grooves are arranged on the back surface of the light reflecting bus bar 15, and the front surface of the light reflecting bus bar 15 is a planar structure, the photovoltaic module may further include: and a front surface reflective film 18 disposed on the front surface of the reflective bus bar 15 to effectively increase the power generation amount on the front surface of the photovoltaic module, wherein the relationship between the reflective bus bar 15 and the back surface reflective film 17 (front surface reflective film 18) can be shown in fig. 10.
Further, the reflective bus bar 15 comprises the front reflective film 18 and/or the back reflective film 17, which can improve the power generation capacity of the photovoltaic module, and when the photovoltaic module is prepared, the reflective bus bar 15 can be sucked by using an automatic sucking machine, and the front reflective film 18 and/or the back reflective film 17 can effectively reduce the probability of suction failure caused by air leakage in the process of sucking the bus bar by the automatic sucking machine. It should be noted that although the surface of the front reflective film 18 and/or the back reflective film 17 is flat, the internal structure of the front reflective film 18 and/or the back reflective film 17 includes a twill structure/reflective texture, etc. which can improve the reflectivity.
For the groove 151 having an inverted triangular or triangular cross-section, an included angle between two side surfaces of the groove 151 is greater than or equal to 90 degrees. For the groove 151 with the inverted trapezoid structure, an included angle between each of two side surfaces of the groove 151 and a concave portion of the groove 151 is greater than 90 degrees. The sunlight reflected to the cell piece by the reflecting bus bar is effectively improved, and therefore the power generation capacity of the photovoltaic module is further improved.
In an embodiment of the present invention, as shown in fig. 11, the light reflecting bus bar 15 may include: a first reflective film 152 and a bus bar 153, wherein the first reflective layer 152 is adhered to the front surface of the bus bar 153. The upper surface of the first light reflecting layer 152 may be a planar structure.
In the embodiment of the present invention, as shown in fig. 12, the light reflecting bus bar 15 may further include, in addition to the first light reflecting film 152 and the bus bar 153: and a second reflective film 154, wherein the second reflective film 154 is adhered to the back surface of the bus bar 153. The existence of the first reflective film 152 and/or the second reflective film 154 can not only improve the power generation capacity of the photovoltaic module, but also can use an automatic suction machine to suck the reflective bus bar 15 when the photovoltaic module is prepared, and the first reflective film 152 and/or the second reflective film 154 can effectively reduce the probability of suction failure caused by air leakage in the process of sucking the bus bar by the automatic suction machine. It should be noted that although the surface of the first reflective film 152 and/or the second reflective film 154 is flat, the internal structure of the first reflective film 152 and/or the second reflective film 154 includes a twill structure/reflective texture, etc. which can improve the reflectivity.
In an embodiment of the present invention, as shown in the top view of the bus bar of fig. 13, the light reflecting bus bar 13 may include: the middle district 155 that converges that is connected with the battery cluster and the tip that is used for being connected with outside terminal box converge district 156, wherein, the width that the width of tip converges district 156 is less than the width of middle district 155 that converges to satisfy the demand that the terminal box was connected to the busbar, tip converges district 156 than wide, can make the busbar edge more be close to the battery piece, makes reflection light can change in easily reaching the battery piece surface, covers bigger battery piece area. In the embodiment of the present invention, the width of the terminal bus bar region 156 is smaller than the width of the wiring hole of the terminal block 19. It should be noted that the cross-sectional structure of the bus bar shown in fig. 13 may be the same as any one of the cross-sectional views shown in fig. 6 to 12, and is not repeated herein.
It should be noted that, in addition to the width variation of the bus bar shown in fig. 13, the width of the light reflecting bus bar of any one of fig. 6 to 12 may be kept constant.
In the embodiment of the present invention, as shown in fig. 14, which is a relative position relationship diagram between the reflective bus bar and the reflective member with different structures, the reflective bus bar shown in fig. 13 may be applied to a photovoltaic module with a junction box 19 disposed in the middle. In addition, the positions and the number of the reflecting bus bars with different structures can be adjusted according to actual requirements.
In the embodiment of the present invention, a first type of light reflecting bus bar having a constant width may be disposed at an edge region of the light transmissive back sheet 16, and a second type of light reflecting bus bar having a constant width may be disposed at a middle region of the light transmissive back sheet 16, wherein the second type of light reflecting bus bar has a width smaller than that of the wiring hole of the external junction box. That is, with the structure shown in fig. 14, the intermediate bus bar may also be replaced with a bus bar of uniform width, wherein the width of the intermediate bus bar is smaller than the width of the wiring hole of the junction box 19. The width of the first type of light-reflecting bus bar is generally not less than that of the second type of light-reflecting bus bar.
In the technical scheme provided by each embodiment, because the overlapping area exists between the battery pieces in the battery string, the light transmission between the battery pieces can be avoided, compared with the conventional double-sided assembly, a transverse light reflecting part is cancelled, the transverse light shielding of the battery pieces on the back side of the assembly is eliminated, the power generation amount of the battery on the back side is improved, however, the light transmission exists at the edge of the battery at the end part of the string, the power generation amount of the end battery is reduced, at the moment, the light reflecting bus bar for connecting a plurality of battery strings in series and/or in parallel is arranged at the end part of the battery string, the light reflecting bus bar can fill the gap between the end part of the battery string and the edge of the back plate, the light in the non-battery piece area at the end part and the edge of the back plate can be reflected to the surface of the battery, the light intensity of the front side and the back side of the end battery is increased, and the power generation amount of the front side of the photovoltaic assembly is improved, the light receiving area of the back of the cell is increased, the generated energy of the back of the photovoltaic module can be effectively improved, and the generated energy of the photovoltaic module is effectively improved.
In addition, the electric power of each cell can be improved and balanced through the light reflecting part and the light reflecting bus bar, so that the improvement of the whole electric power of the photovoltaic module is ensured.
Fig. 15 is a flow chart of a process for manufacturing a photovoltaic module according to an embodiment of the present invention. The preparation process of the photovoltaic module can comprise the following steps:
step S1501: arranging a light reflecting part on the light-transmitting back plate, wherein the position of the light reflecting part on the light-transmitting back plate corresponds to a gap between two adjacent battery strings or corresponds to a gap between the battery strings and the edge of the light-transmitting back plate;
the light reflecting part can be formed by coating a composition containing a binder, an inorganic film forming material and a solvent on the back plate, wherein the width of the coated light reflecting part is not less than the gap between two adjacent battery strings or the gap between the battery string and the edge of the light-transmitting back plate. The light reflecting members are distributed along the gaps between the cell strings and the edges of the light-transmitting back plate. The edge of the light-transmitting back plate is the edge parallel to the extending direction of the battery strings in the back plate.
Step S1502: laying a packaging adhesive film on the glass cover plate, and laying the battery strings with the overlapped areas and the light-reflecting bus bars on the packaging adhesive film;
in this step, for the configuration shown in fig. 14, a light-reflecting bus bar 15 of constant width may be applied to the edge region of the glass cover plate, and a light-reflecting bus bar 15 having end bus bars 156 connected to the external junction box as shown in fig. 13 may be applied to the middle region of the glass cover plate, wherein the width of the end bus bars 156 is smaller than the middle region 155 of the light-reflecting bus bar 15.
In addition, with the structure shown in fig. 14, the bus bar in the middle thereof may be replaced with a bus bar having a uniform width, wherein the width of the bus bar in the middle is smaller than the width of the wiring hole of the junction box 19.
Step S1503: and further paving an encapsulation adhesive film on the battery string and the light-reflecting bus bar, covering the light-transmitting back plate on the encapsulation adhesive film, and laminating.
The following description is given with reference to a specific embodiment.
Referring to fig. 5, a double glass backplane or transparent backplane for a stitch-welded or tiled double-sided photovoltaic module, the reflective member 14 is only applied between the strings of cells and not between the cells. When the back sheet shown in fig. 5 is applied to the photovoltaic module shown in fig. 14, the photovoltaic module has no light shielding material between the cells. Taking 182 half cells as an example, the power generation area of 172mm x (5 to 10) mm can be increased for each half cell, and the power generation amount of the back of the module is improved.
However, for each string of the head and tail battery pieces, the string of the head and tail battery pieces are close to the edge of the battery string, and because the reflective materials between the battery pieces are removed, light rays at the end part (the head or the tail of the string) of the battery string can directly penetrate through the back plate glass or the transparent back plate, light loss exists, the power of the front side of the battery at the end part of the string can be influenced, the current of the battery is mismatched with that of other battery pieces of the string, and the power generation of the whole string of the battery string is further influenced, so that the power generation amount of the front side of the whole assembly is reduced. Similarly, the cells at the end of the back group string are not shielded by the reflective material, and the same problem is also caused. Therefore, as shown in fig. 14, the double-sided light reflecting bus bars shown in fig. 8 to 10 and 12 are further provided at the end of the battery string. The light reflecting path of the double-sided light reflecting bus bar is shown in fig. 16. That is, when light is irradiated on the surface of the double-sided light-reflecting bus bar, the light can be refracted to the surface of the battery through the interface between the glass and the air. Through set up reflection of light busbar or replace current ordinary busbar with this reflection of light busbar at battery cluster tip, can implement the optical compensation to battery cluster tip battery front and reverse side to the electric current mismatch that the reverberation of having avoided the battery piece absorption of battery cluster tip is not enough and produces has guaranteed battery cluster, battery cluster group and photovoltaic module's generated energy.
It is worth noting that in addition to the above-described arrangement of the light reflecting means and the light reflecting bus bars in the photovoltaic module, only the light reflecting bus bars may be arranged in the photovoltaic module. Namely: another photovoltaic module provided by the embodiment of the present invention may include: the solar cell module comprises a glass cover plate 11, a packaging adhesive film 12, a cell string 13 with an overlapping area between cells, a light-reflecting bus bar 15 and a light-transmitting back plate 16, wherein the packaging adhesive film 12 is used for packaging the cell string 13 between the glass cover plate 11 and the light-transmitting back plate 16; the light reflecting bus bar 15 is provided at an end of the battery string 13, and serves to connect the plurality of battery strings 13 in series and/or in parallel, and reflects light for the battery strings 13.
Correspondingly, the preparation process of the photovoltaic module only provided with the light reflecting bus bar comprises the following steps:
step (a'), paving a packaging adhesive film 12 on the glass cover plate 11, and paving a battery string 13 and a reflective bus bar 15 with an overlapping area on the packaging adhesive film 12;
and (b'), further paving an encapsulation adhesive film 12 on the battery string 13 and the reflective bus bar 15, covering the encapsulation adhesive film 12 with a light-transmitting back plate 16, and laminating.
The embodiment of the invention provides the following technical schemes and combinations of the technical schemes.
the packaging adhesive film 12 is used for packaging the battery string 13 between the glass cover plate 11 and the light-transmitting back plate 16;
the light reflecting component 14 is disposed on the main surface 161 of the light-transmitting back sheet 16 contacting with the packaging adhesive film 12;
the light reflecting component 14 corresponds to a gap between two adjacent battery strings 13 or corresponds to a gap between the battery strings 13 and the edge of the light-transmitting back plate 16;
the light reflecting bus bar 15 is disposed at an end of the battery string 13, and is used to connect the battery string 13 in series and/or in parallel, and reflects light for the battery string 13.
Technical solution 2 the photovoltaic module according to the technical solution 1,
a plurality of the light reflecting members 14 are distributed in parallel along the extending direction of the battery string 13 on the main surface 161 of the light-transmitting back sheet 16.
Technical solution 3 the photovoltaic module according to technical solution 1 or 2,
the intermediate region 141 of the reflector 14 overlaps the gap;
the edge region 142 of the light reflecting member 14 overlaps the edge of the battery string 13 adjacent thereto.
Technical solution 4 the photovoltaic module according to technical solution 1,
the light reflecting member 14 includes: the coating material comprises a binder, an inorganic film-forming material and a solvent, wherein the inorganic film-forming material comprises any one or more of titanium dioxide, silicon dioxide, zirconium oxide, aluminum oxide, zinc oxide and the like.
Technical solution 5 the photovoltaic module according to technical solution 1,
a plurality of grooves 151 are arranged on the front and/or back of the light reflecting bus bar 15, and preferably, the cross section of each groove 151 is an inverted triangle, an approximately inverted triangle, or an inverted trapezoid.
Technical solution 6 the photovoltaic module according to technical solution 5,
a plurality of grooves are arranged on the front surface of the light reflecting bus bar 15, and the back surface of the light reflecting bus bar 15 is of a plane structure,
the photovoltaic module further includes: a back light reflecting layer 17 disposed on the back of the light reflecting bus bar 15;
or,
a plurality of grooves are arranged on the back surface of the light reflecting bus bar 15, and the front surface of the light reflecting bus bar 15 has a planar structure,
the photovoltaic module further includes: and a front light reflecting layer 18 disposed on the front surface of the light reflecting bus bar 15.
Technical solution 7, according to the photovoltaic module of technical solution 1, the light reflecting bus bar 15 includes: a first light reflecting layer 152, and a bus bar 153 in which,
the first light reflecting layer 152 is adhered to the front surface of the bus bar 153.
Technical solution 8, according to the photovoltaic module of technical solution 7, the light reflecting bus bar 15 further includes: a second light-reflecting layer 154, wherein,
the second light reflecting layer 154 is adhered to the back surface of the bus bar 153.
Claim 9, the photovoltaic module according to any one of claims 1, 5 and 7, wherein the light reflecting bus bar 15 includes: an intermediate bus bar region 155 connected to the cell string, and an end bus bar region 156 for connection to an external junction box, wherein,
the width of the intermediate bus bar region 155 is greater than the width of the end bus bar regions 156.
Claim 10 and the photovoltaic module according to claim 9,
the width of the end bus bar region 156 is smaller than the width of the terminal hole of the terminal block.
the light-reflecting bus bars 15, the width of which remains constant, are arranged in the edge regions of the light-transmitting backsheet 16, and the light-reflecting bus bars 15, which have end bus regions 156 connected to an external junction box, are arranged in the center region of the light-transmitting backsheet 16.
the first type of light-reflecting bus bar with the unchanged width is arranged at the edge area of the light-transmitting back plate 16, and the second type of light-reflecting bus bar with the unchanged width is arranged at the middle area of the light-transmitting back plate 16, wherein the width of the second type of light-reflecting bus bar is smaller than that of the wiring hole of the external junction box.
the battery string 13 is a stitch-welded battery string or a shingled battery string.
step (a), arranging a light reflecting component 14 on a light-transmitting back plate 16, wherein the position of the light reflecting component 14 on the light-transmitting back plate 16 corresponds to a gap between two adjacent battery strings 13 or corresponds to a gap between the battery strings 13 and the edge of the light-transmitting back plate 16;
step (b), laying a packaging adhesive film 12 on the glass cover plate 11, and laying a battery string 13 and a light-reflecting bus bar 15 with an overlapping area on the packaging adhesive film 12;
and (c) further paving an encapsulation adhesive film 12 on the battery string 13 and the reflective bus bar 15, covering the light-transmitting back plate 16 on the encapsulation adhesive film 12, and laminating.
a light-reflecting bus bar 15 having a constant width is laid on an edge region of the glass cover plate 11, and a light-reflecting bus bar 15 having an end bus bar region 156 connected to an external junction box is laid on a middle region of the light-transmitting back plate 16, wherein the width of the end bus bar region 156 is smaller than that of the middle region of the light-reflecting bus bar 15.
the packaging adhesive film 12 is used for packaging the battery string 13 between the glass cover plate 11 and the light-transmitting back plate 16;
the light reflecting bus bar 15 is disposed at an end of the battery string 13, and is used to connect the battery string 13 in series and/or in parallel, and reflects light for the battery string 13.
The process for preparing a photovoltaic module according to claim 17 or 16 includes:
step (a'), paving a packaging adhesive film 12 on the glass cover plate 11, and paving a battery string 13 and a reflective bus bar 15 with an overlapping area on the packaging adhesive film 12;
and (b'), further paving an encapsulation adhesive film 12 on the battery string 13 and the reflective bus bar 15, covering the encapsulation adhesive film 12 with a light-transmitting back plate 16, and laminating.
The above steps are provided only for helping to understand the method, structure and core idea of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the principles of the invention, and these changes and modifications also fall within the scope of the appended claims.
Claims (10)
1. A photovoltaic module, comprising: a glass cover plate (11), a packaging adhesive film (12), a battery string (13) with an overlapping area among the battery pieces, a light reflecting component (14), a light reflecting bus bar (15) and a light-transmitting back plate (16), wherein,
the packaging adhesive film (12) is used for packaging the battery string (13) between the glass cover plate (11) and the light-transmitting back plate (16);
the light reflecting component (14) is arranged on the main surface (161) of the light-transmitting back plate (16) which is in contact with the packaging adhesive film (12);
the light reflecting component (14) corresponds to a gap between two adjacent battery strings (13) or corresponds to a gap between the battery strings (13) and the edge of the light-transmitting back plate (16);
the light-reflecting bus bar (15) is arranged at the end part of the battery string (13) and is used for connecting the battery strings (13) in series and/or in parallel and reflecting light rays for the battery strings (13).
2. The photovoltaic module of claim 1,
the light reflecting components (14) are distributed on the main surface (161) of the light-transmitting back plate (16) in parallel along the extending direction of the battery string (13).
3. The photovoltaic module of claim 1 or 2,
the intermediate region (141) of the light-reflecting component (14) overlaps the gap;
the edge region (142) of the light-reflecting member (14) overlaps the edge of the adjacent cell string (13).
4. The photovoltaic module of claim 1,
the light reflecting member (14) includes: the coating material comprises a binder, an inorganic film-forming material and a solvent, wherein the inorganic film-forming material comprises any one or more of titanium dioxide, silicon dioxide, zirconium oxide, aluminum oxide, zinc oxide and the like.
5. The photovoltaic module of claim 1,
the front surface and/or the back surface of the light reflecting bus bar (15) are/is provided with a plurality of grooves (151), and preferably, the cross section of each groove (151) is in an inverted triangle structure or an approximately inverted triangle structure or an inverted trapezoid structure.
6. The photovoltaic module according to claim 1, characterized in that said reflective bus-bar (15) comprises: a first light reflecting layer (152) and bus bars (153), wherein,
the first light reflecting layer (152) is adhered to the front surface of the bus bar (153).
7. Photovoltaic module according to any one of claims 1, 5 and 6, characterized in that said reflecting bus-bar (15) comprises: an intermediate bus bar region (155) connected to the cell string and an end bus bar region (156) for connection to an external junction box, wherein,
the width of the intermediate bus bar region (155) is greater than the width of the end bus bar regions (156).
8. The photovoltaic module of claim 7,
a light-reflecting bus bar (15) having a constant width is arranged in the edge region of the light-transmitting back sheet (16), and a light-reflecting bus bar (15) having an end bus region (156) connected to an external junction box is arranged in the middle region of the light-transmitting back sheet (16).
9. A process for preparing a photovoltaic module, comprising:
step (a), arranging a light reflecting part (14) on a light-transmitting back plate (16), wherein the position of the light reflecting part (14) on the light-transmitting back plate (16) corresponds to a gap between two adjacent battery strings (13) or corresponds to a gap between the battery strings (13) and the edge of the light-transmitting back plate (16);
step (b), laying a packaging adhesive film (12) on the glass cover plate (11), and laying a battery string (13) with an overlapping area and a light-reflecting bus bar (15) on the packaging adhesive film (12);
and (c) laying an encapsulation adhesive film (12) on the battery string (13) and the reflective bus bar (15), covering the encapsulation adhesive film (12) with a light-transmitting back plate (16), and laminating.
10. A photovoltaic module, comprising: a glass cover plate (11), a packaging adhesive film (12), a battery string (13) with an overlapping area between battery sheets, a light-reflecting bus bar (15) and a light-transmitting back plate (16),
the packaging adhesive film (12) is used for packaging the battery string (13) between the glass cover plate (11) and the light-transmitting back plate (16);
the light-reflecting bus bar (15) is arranged at the end part of the battery string (13) and is used for connecting the battery strings (13) in series and/or in parallel and reflecting light rays for the battery strings (13).
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| CN114695586A (en) * | 2022-03-18 | 2022-07-01 | 苏州零碳绿建新能源科技有限公司 | BIPV (building integrated photovoltaic) module and preparation method thereof |
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