CN113611763A - Photovoltaic module and preparation method thereof - Google Patents

Photovoltaic module and preparation method thereof Download PDF

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Publication number
CN113611763A
CN113611763A CN202110882642.9A CN202110882642A CN113611763A CN 113611763 A CN113611763 A CN 113611763A CN 202110882642 A CN202110882642 A CN 202110882642A CN 113611763 A CN113611763 A CN 113611763A
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China
Prior art keywords
adhesive film
transparent
film layer
battery
photovoltaic module
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Pending
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CN202110882642.9A
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Chinese (zh)
Inventor
陈道远
赵荣
王樱
周艳方
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Beijing Jingao Solar Energy Photovoltaic Technology Co ltd
Shanghai Ja Solar Pv Technology Co ltd
JA Solar Technology Yangzhou Co Ltd
Original Assignee
Beijing Jingao Solar Energy Photovoltaic Technology Co ltd
Shanghai Ja Solar Pv Technology Co ltd
JA Solar Technology Yangzhou Co Ltd
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Application filed by Beijing Jingao Solar Energy Photovoltaic Technology Co ltd, Shanghai Ja Solar Pv Technology Co ltd, JA Solar Technology Yangzhou Co Ltd filed Critical Beijing Jingao Solar Energy Photovoltaic Technology Co ltd
Priority to CN202110882642.9A priority Critical patent/CN113611763A/en
Publication of CN113611763A publication Critical patent/CN113611763A/en
Pending legal-status Critical Current

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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
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • 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
    • 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
    • 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
    • H01L31/1876—Particular processes or apparatus for batch treatment of the devices
    • 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)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses a photovoltaic module and a preparation method thereof. This photovoltaic module includes: the solar cell comprises a glass cover plate, an upper packaging adhesive film, a plurality of series and/or parallel battery strings, a reflective adhesive film layer and a back plate which are sequentially arranged from top to bottom, wherein each battery string comprises a plurality of battery pieces, the front surface and the back surface of each battery piece are provided with main grids, and the main grids on the front surface of a first battery piece of every two adjacent battery pieces are connected with the main grids on the back surface of a second battery piece through welding strips; a transparent film layer is arranged at least on the front side of the first battery piece close to the first edge area of the second battery piece and/or on the back side of the second battery piece close to the second edge area of the first battery piece; the reflecting film layer is formed by white EVA with the pre-crosslinking degree of less than 50%, white POE with the pre-crosslinking degree of less than 12% or white EVA with the melting index of less than 12. The photovoltaic module can improve performance.

Description

Photovoltaic module and preparation method thereof
Technical Field
The invention relates to a photovoltaic module and a preparation method thereof.
Background
The improvement of the photoelectric conversion efficiency of the photovoltaic module or the power generation capacity of the photovoltaic module in unit area is a target pursued by the photovoltaic industry. The improvement of the light reflection of the blank areas between the cell strings and between the cell sheets is one of the main directions for improving the photoelectric conversion efficiency of the photovoltaic module.
At present, there are two main ways to improve the light reflection of the blank areas between the battery strings and between the battery sheets, one is to improve the reflectivity of the back plate, and the other is to arrange a white EVA with high reflectivity between the back plate and the battery strings, which can effectively improve the light reflectivity. However, the white EVA may overflow to the edge of the cell during the lamination process, and the overflow white EVA may block the cell, and the white EVA has high reflectivity and poor light transmittance, resulting in poor performance of the photovoltaic module.
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 method for manufacturing the same, which solves the problem of overflow of a lower-layer encapsulant film with a strong reflective property, such as white EVA, and the problem of increased lamination subfissure, and avoids blocking of a cell by the lower-layer encapsulant film, thereby effectively improving the performance of the 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, an upper packaging adhesive film, a plurality of battery strings which are connected in series and/or in parallel, a reflective adhesive film layer and a back plate which are arranged from top to bottom in sequence, wherein,
each battery string comprises a plurality of battery pieces, the front and the back of each battery piece are respectively provided with a main grid, and the main grid on the front of the first battery piece of every two adjacent battery pieces is connected with the main grid on the back of the second battery piece through a welding strip;
at least, a transparent adhesive film layer is arranged on the front side of the first battery piece close to the first edge area of the second battery piece and/or on the back side of the second battery piece close to the second edge area of the first battery piece, and the reflective adhesive film layer is formed by white EVA with a pre-crosslinking degree of less than 50%, white POE with a pre-crosslinking degree of less than 12% or white EVA with a melting index of less than 12.
In a second aspect, the present invention provides a method for preparing a photovoltaic module, comprising:
step 1, arranging a transparent film layer at least on a first edge area of the front side of a first battery piece of each battery string, which is close to a second battery piece, and/or a second edge area of the back side of the second battery piece, which is close to the first battery piece;
and 2, sequentially arranging the back plate, the reflecting adhesive film layer, the battery string provided with the transparent adhesive film layer, the upper packaging adhesive film and the glass cover plate, and laminating to form the photovoltaic module.
The technical scheme of the first aspect of the invention has the following advantages or beneficial effects: according to the photovoltaic module provided by the embodiment of the invention, the reflective adhesive film layer formed by the white EVA with the pre-crosslinking degree of less than 50%, the white POE with the pre-crosslinking degree of less than 12% or the white EVA with the melt index of less than 12 replaces the lower-layer packaging adhesive film in the prior art, and the reflective adhesive film layer has the characteristics of higher hardness and lower fluidity, so that the reflective adhesive film layer does not overflow, the blocking of the reflective adhesive film layer on the upper surface of the cell is avoided, and the performance of the photovoltaic module is effectively improved.
In addition, the transparent film layer is arranged at least in a first edge area close to the second cell piece in the front surface of the first cell piece and/or a second edge area close to the first cell piece in the back surface of the second cell piece in two adjacent cell pieces, so that the problem of hidden cracking of the cell pieces can be solved, and the performance of the photovoltaic module is further improved.
Drawings
Figure 1 is a schematic cross-sectional view of a photovoltaic module according to example 1 of the present invention;
fig. 2A is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is disposed on the front surface of a cell sheet according to example 2 of the present invention;
fig. 2B is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is disposed on the front surface of a cell sheet according to example 2 of the present invention;
fig. 3A is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is provided on both front and back surfaces of a cell sheet according to example 3 of the present invention;
fig. 3B is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is provided on both front and back surfaces of a cell sheet according to example 3 of the present invention;
fig. 4A is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is disposed on the back surface of a cell sheet according to embodiment 4 of the present invention;
fig. 4B is a schematic cross-sectional view of a photovoltaic module in which a transparent adhesive film layer is disposed on the back surface of a cell sheet according to embodiment 4 of the present invention;
FIG. 5A is a schematic diagram of a light reflection path of a photovoltaic module according to an embodiment of the present invention;
FIG. 5B is a schematic diagram of a light reflection path of a photovoltaic module according to another embodiment of the present invention;
fig. 6A is a top view of the battery string according to embodiment 1 shown in fig. 1, according to the present invention;
fig. 6B is a bottom view of the battery string of embodiment 1 of fig. 1 according to the present invention;
fig. 7A is a top view of the battery string of embodiment 2 shown in fig. 2A according to the present invention;
fig. 7B is a bottom view of the battery string of embodiment 2 of fig. 2A according to the present invention;
fig. 7C is a bottom view of the battery string of embodiment 3 of fig. 3A according to the present invention;
fig. 7D is a top view of the battery string of embodiment 2 shown in fig. 2B according to the present invention;
fig. 7E is a bottom view of the battery string of embodiment 3 of fig. 3B according to the present invention;
fig. 7F is a top view of the battery string of embodiment 4 of fig. 4A according to the present invention;
figure 8 is a schematic cross-sectional view of a photovoltaic module according to example 5 of the present invention;
figure 9 is a schematic cross-sectional view of a photovoltaic module according to example 6 of the present disclosure;
figure 10 is a schematic cross-sectional view of a photovoltaic module according to example 7 of the present disclosure;
figure 11 is a schematic cross-sectional view of a photovoltaic module according to example 8 of the present disclosure;
FIG. 12 is a schematic view of a reflected light reflection path of a photovoltaic module according to the prior art;
FIG. 13 is a schematic view of a reflected light reflection path of another photovoltaic module according to the prior art;
FIG. 14 is a schematic view of a reflected light reflection path of yet another photovoltaic module according to the prior art;
fig. 15 is a main flow diagram schematically illustrating a method for manufacturing a photovoltaic module according to an embodiment of the present invention.
The reference numbers are as follows:
Prior Art
110-a glass cover plate; 120-upper packaging adhesive film; 130-cells in a string;
150-a backsheet;
140-lower layer packaging adhesive film;
14' -a double-layer co-extrusion structure;
141' -upper layer transparent EVA adhesive film;
142' -lower layer white EVA glue film;
14' -three-layer co-extrusion structure;
141' -a first layer of transparent EVA adhesive film;
142' -a second layer of white EVA adhesive film;
143' -third layer of transparent EVA adhesive film;
the invention
11-a glass cover plate; 12-upper packaging adhesive film; 13-a battery string; 131-solder strip; 132-a first edge region; 133-a second edge region; 134-a transparent adhesive film layer; 135-a battery piece; 14-a reflective glue film layer; 15-a back plate; 16-adhesive glue film layer.
Detailed Description
Fig. 12 is a schematic diagram of a reflected light reflection path of a photovoltaic module according to the prior art. The upper-layer encapsulant film 120 and the lower-layer encapsulant film 140 of the photovoltaic module shown in fig. 12 are both transparent EVA films, the lower-layer encapsulant film 140 is a single-layer structure, and the photovoltaic module shown in fig. 12 reflects light through the back sheet. In the photovoltaic module shown in fig. 12, after passing through the glass cover plate 110 and the upper-layer encapsulant film 120, the sunlight reaches the lower-layer encapsulant film 140 through the gaps between the cell strings and/or the gaps between the cell sheets 130, the sunlight passes through the lower-layer encapsulant film 140 to reach the back plate, and the reflected sunlight is reflected by the back plate, and the reflected sunlight needs to pass through the lower-layer encapsulant film 140 again and then irradiate onto the cell sheets again, so that the conversion efficiency of the cell is increased. However, in the photovoltaic module shown in fig. 12, during the incident of sunlight to the back sheet 150, the sunlight needs to pass through the lower encapsulant film 140 without reflection performance (the material of the lower encapsulant film 140 is generally the same as that of the upper encapsulant film), and the light reflected by the back sheet 150 needs to pass through the lower encapsulant film 140 again, so that both the light incident on the back sheet 150 and the light reflected by the back sheet 150 are blocked by the lower encapsulant film 140.
In order to shorten the reflection path light path of sunlight, in the prior art, a white reflective material is added into the lower-layer packaging adhesive film EVA of the photovoltaic module (namely, the lower-layer packaging adhesive film is white EVA), so that the reflection capacity of the lower-layer packaging adhesive film is increased. However, the problem of overflow is easily caused due to the strong fluidity of the white EVA, and the problem of hidden cracking of the cell is easily caused by selecting the white EVA with higher hardness. Therefore, as shown in fig. 13 and 14, the lower packaging adhesive film shown in fig. 13 is a double-layer co-extruded structure 14' including an upper transparent EVA adhesive film 141' and a lower white EVA adhesive film 142 '. The lower packaging film shown in fig. 14 is a three-layer co-extruded structure 14 ″ including a first transparent EVA film 141 ″, a second white EVA film 142 ″, and a third transparent EVA film 143 ″. The white EVA adhesive films in the double-layer co-extrusion structure or the triple-layer co-extrusion structure of the lower-layer encapsulation adhesive film of the photovoltaic module shown in fig. 13 or 14 are both conventional white EVA which is not subjected to pre-crosslinking treatment or has a high melt index, and have high fluidity, and in order to prevent the white EVA from overflowing onto the cell sheet in the lamination process, the white EVA is covered with transparent EVA. In the reflection path of the co-extrusion structure in the photovoltaic module shown in fig. 13 or fig. 14, light (incident light) entering the lower white EVA film 142 'shown in fig. 13 or the middle white EVA film 142 ″ shown in fig. 14 needs to pass through the transparent EVA film located at the uppermost layer, and light (reflected light) reflected by the lower white EVA film 142' shown in fig. 13 or the second white EVA film 142 ″ shown in fig. 14 also needs to pass through the transparent EVA film at the uppermost layer to reach the battery piece, so that the transparent EVA film covering the white EVA film can block the reflected light in order to prevent the white EVA film from overflowing.
In summary, the photovoltaic modules in the prior art all weaken the reflected light reaching the cell, resulting in low photoelectric conversion efficiency and electrical efficiency of the photovoltaic modules.
Embodiments of the present invention provide a photovoltaic module, which can effectively shorten a reflection path and reduce blocking of light compared to an existing photovoltaic module.
The transparent EVA adhesive film of the invention is a transparent adhesive film formed by laminating conventional EVA materials; the white EVA adhesive film is formed by adding a white reflective material into a conventional EVA material and then laminating.
The first cell piece and the second cell piece of every two adjacent cell pieces are relative concepts. In the application, the cell piece with the front main grid connected with the welding strip is taken as a first cell piece, and the cell piece with the back main grid connected with the welding strip is taken as a second cell piece, so that part of the cell pieces in the cell string can be the first cell piece and the second cell piece.
The edge region refers to a region on the front or back surface of the cell near the side surface of the cell; the first edge area and the second edge area are connected by the same welding strip, the first edge area is the edge of the first battery piece close to the second battery piece, and the second edge area is the edge of the second battery piece close to the first battery piece.
The transparent adhesive film layer is at least directly or indirectly contacted with the surface of the edge region or at least directly or indirectly covered on the surface of the edge region, wherein the transparent adhesive film layer is at least indirectly contacted with the surface of the edge region or at least indirectly covered on the surface of the edge region, and other components such as a welding strip and the like can be arranged between the transparent adhesive film layer and the edge region.
As shown in fig. 1 to 11, an embodiment of the present invention provides a photovoltaic module, including: the solar cell comprises a glass cover plate 11, an upper packaging adhesive film 12, a plurality of battery strings 13 connected in series and/or in parallel, a reflective adhesive film layer 14 and a back plate 15 which are sequentially arranged from top to bottom, wherein the upper packaging adhesive film 12 is arranged between the glass cover plate 11 and the battery strings 13; the reflective adhesive film layer 14 is disposed between the battery string 13 and the back plate 15.
Each battery string 13 comprises a plurality of battery pieces 135, and the front and back of each battery piece 135 are provided with main grids; fig. 1, 2A to 4B show that in each cell string 13, the main grid on the front side of the first cell of each two adjacent cell sheets 135 is connected with the main grid on the back side of the second cell sheet through the solder ribbon 131.
Wherein a transparent adhesive film layer 134 is disposed on a first edge region 132 of the front surface of the first cell piece near the second cell piece and/or a second edge region 133 of the back surface of the second cell piece near the first cell piece, specifically, as shown in fig. 1, the transparent adhesive film layer 134 may be disposed between the first cell piece and the second cell piece and overlap the solder strip 131 along an inclination angle of the solder strip 131 between the first cell piece and the second cell piece to overlap the second edge region 133. Specifically, in fig. 1, the end of the transparent adhesive film layer 134 overlapping the first edge region 132 is disposed between the first edge region 132 and the first cell, and then the lower surface of the solder strip attached between the first cell and the second cell extends to the second edge region 133, and the end of the transparent adhesive film layer 134 overlapping the second edge region 133 is disposed on the lower surface of the solder strip 131 disposed on the second edge region 133. As shown in fig. 2A and 2B, a transparent adhesive film layer 134 may be disposed on the front surface of the first cell piece near the first edge region 132 of the second cell piece; as shown in fig. 4A and 4B, a transparent adhesive film layer 134 may be further disposed in the back surface of the second cell sheet near the second edge region 133 of the first cell sheet; as shown in fig. 1, 3A and 3B, a transparent adhesive film layer 134 may be further disposed on the front surface of the first cell piece near the first edge region 132 of the second cell piece and on the back surface of the second cell piece near the second edge region 133 of the first cell piece. As shown in fig. 2A, fig. 3A and fig. 4A, the transparent adhesive film layer 134 may be disposed between the first edge region 132 and the solder strip 131; and/or, a transparent adhesive film layer 134 may be disposed between the second edge region 133 and the solder strip 131. As shown in fig. 2B, fig. 3B and fig. 4B, the transparent adhesive film layer 134 may further cover the solder strip 131 of the first edge region 132; and/or, a transparent adhesive film layer 134 may be coated on the solder strip 131 of the second edge region 133. The position of the transparent adhesive film layer 134 has flexibility, and a user can flexibly set the position of the transparent adhesive film layer according to actual requirements such as aesthetic requirements and the like.
For the photovoltaic module shown in fig. 1 and 8, the transparent adhesive film layer 134 is disposed between the first cell piece and the second cell piece, so that the upper encapsulant film 12 can be prevented from flowing downward through the transparent adhesive film layer 134 and the reflective adhesive film layer 14 can be prevented from flowing upward through the transparent adhesive film layer 134 during the lamination process, and therefore, the upper encapsulant film 12 and the reflective adhesive film layer 14 use the transparent adhesive film layer 134 as a boundary, and both sides of the transparent adhesive film layer 134 are inclined structures.
For the photovoltaic modules shown in fig. 2A to 4B and fig. 9 to 11, the transparent adhesive film layer 134 is disposed in the edge region and is not disposed between the cells, and the solder ribbons between the cells in the cell string are thin and do not provide a substantial barrier effect to the upper encapsulant film 12 and the reflective adhesive film layer 14 during the lamination process, so that the boundary between the upper encapsulant film 12 and the reflective adhesive film layer 14 is a plane.
In addition, in order to clearly illustrate the relative positional relationship of the transparent adhesive film layer 134 and the battery sheet, fig. 6A and 6B show a top view and a bottom view of the battery string corresponding to fig. 1, respectively; fig. 7A shows a top view of a battery string corresponding to fig. 2A; fig. 7B shows a bottom view of the battery string corresponding to fig. 2A; fig. 7C shows a bottom view of the battery string corresponding to fig. 3A, the top view of fig. 3A coinciding with the top view of fig. 2A; fig. 7D shows a top view of the battery string corresponding to fig. 2B, the bottom view of fig. 2B coinciding with the bottom view of fig. 2A; fig. 7E shows a bottom view of the battery string corresponding to fig. 3B, the top view of fig. 3B coinciding with the top view of fig. 2B; fig. 7F shows a top view of the battery string corresponding to fig. 4A, the bottom view of fig. 4A corresponds to the bottom view of fig. 3A, the top view of fig. 4B corresponds to the top view of fig. 4A, and the bottom view of fig. 4B corresponds to the bottom view of fig. 3B, which will not be described again. In addition, the distance between the battery pieces is larger than 0 in the attached drawings provided by the embodiment of the invention. That is, a gap is formed between the cell pieces, sunlight can enter the reflective adhesive film layer through the gap to generate reflected light, and the reflected light is reflected to the cell pieces, so that the electrical conversion efficiency of the cell pieces is improved.
In addition, as shown in fig. 5A and 5B, the battery pieces 135 in each battery string 13 in the embodiment of the present invention are in a relative position relationship with the upper packaging adhesive film 12 and the reflective adhesive film layer 14, and the upper packaging adhesive film 12 and the reflective adhesive film layer 14 are filled between the battery strings. Specifically, the upper encapsulant film 12 and the reflective film 14 are heated to melt during the lamination process of the photovoltaic module, and then flow between the glass cover sheet and the back sheet, eventually filling the gap between the strings. The reflective adhesive film layer of fig. 5A is formed of white EVA with a pre-crosslinking degree of less than 50%, white POE with a pre-crosslinking degree of less than 12%, or white EVA with a melt index of less than 12, and a co-extruded structure (described in detail below with reference to fig. 8 to 11) formed by co-extruding the reflective adhesive film layer 14 and the adhesive film layer 16 is between the back sheet 15 and the battery string of fig. 5B, wherein the reflective adhesive film layer 14 of fig. 5B is located above the adhesive film layer 16, and the reflective adhesive film 14 of fig. 5B is also formed of white EVA with a pre-crosslinking degree of less than 50%, white POE with a pre-crosslinking degree of less than 12%, or white EVA with a melt index of less than 12.
In addition, the battery string 13 and the back sheet 15 may have a single-layer structure or a double-layer structure. As for the single-layer structure, reference may be made to fig. 1 and fig. 2A to fig. 4B, that is, a reflective adhesive film layer 14 is disposed between the battery string 13 and the back plate 15, and as for the double-layer structure, reference may be made to fig. 8 to fig. 11, that is, a reflective adhesive film layer 14 and an adhesive film layer 16 are disposed between the battery string 13 and the back plate 15, wherein the adhesive film layer 16 is disposed between the reflective adhesive film layer 14 and the back plate 15. First, the reflective film layer described in either the single layer structure or the double layer structure includes: the hardness of the reflective adhesive film layer 14 can be improved by selecting the white EVA with the pre-crosslinking degree of less than 50% or the white POE with the pre-crosslinking degree of less than 12% (wherein the EVA is short for Polyethylene vinyl acetate copolymer) or the white POE with the pre-crosslinking degree of less than 12% (wherein the POE is short for ethylene-octene copolymer), and the hardness of the reflective adhesive film layer 14 can be improved, so that the reflective adhesive film layer 14 is prevented from overflowing to the upper surface of the battery piece. In a preferred embodiment, the reflective adhesive film layer 14 may include: white EVA with the pre-crosslinking degree of less than 45% or white POE with the pre-crosslinking degree of less than 10%.
In addition, the reflective adhesive film layer 14 may further include: white EVA with a melt index less than 12. The material can improve the hardness of the reflecting adhesive film layer 14 and prevent the reflecting adhesive film layer from overflowing to the upper surface of the cell. In a preferred embodiment, the reflective adhesive film layer 14 may include: white EVA with a melt index less than 10.
Aiming at the reflective adhesive film layer 14, the core of the embodiment of the invention is to control or select the pre-crosslinking degree or the melt index of the white EVA and the white POE so as to solve the overflow problem of the reflective adhesive film layer. Due to the selected pre-crosslinking degree or the selected melt index, the white EVA or the white POE can have certain hardness, in order to avoid the problem that the hardness of the white EVA or the white POE causes the hidden cracking of the cell, the transparent adhesive film layer 134 is arranged on the front surface of the first cell close to the first edge region 132 of the second cell and/or on the back surface of the second cell close to the second edge region 133 of the first cell, in the laminating process of the photovoltaic module, the transparent adhesive film layer 134 can effectively relieve the pressure of the harder reflective adhesive film layer on the edge of the cell in the laminating process, so that the problem that the cell is hidden cracked due to the interaction between the welding strip and the edge of the cell is avoided, and thus the performance of the photovoltaic module can be effectively improved, such as the photoelectric conversion performance and the power of the photovoltaic module are improved, the service life of the photovoltaic module is prolonged, and the generation of hot spots is reduced.
In the embodiment of the present invention, as shown in fig. 8 to 11, the photovoltaic module white includes a bonding film layer 16, the bonding film layer 16 is located below the reflective film layer 14, and the bonding film layer 16 and the reflective film layer 14 form a co-extrusion structure, wherein the bonding film layer 16 is located between the back plate 15 and the reflective film layer 14, and the reflective film layer 14 may have a material identical to that of the single reflective film layer. The adhesive film layer 16 is made of transparent EVA material, and the adhesive strength between the adhesive film layer 16 and the back plate 15 is greater than the adhesive strength between the reflective film layer 14 and the back plate, so that the adhesive property between the reflective film layer 14 and the back plate 15 can be improved through the adhesive film layer 16. In particular, the problem of insufficient adhesive force of the back plate with an inner layer coating structure such as KPC (back plate formed by Polyethylene terephthalate (PET) with polyvinylidene fluoride (PVDF)) coating, CPC (back plate formed by Polyethylene terephthalate with fluorine coating), TPC (back plate formed by Polyethylene terephthalate with Polyfluoroethylene (PVF)) and the like can be solved. It should be noted that the co-extrusion structure shown in fig. 8 to 11 may also replace the reflective adhesive film layer shown in fig. 2B, 3B and 4B, and in addition, for the co-extrusion structure shown in fig. 8 to 11, the transparent adhesive film layer may also be disposed on the solder strip.
Therefore, the photovoltaic module provided by the embodiment of the invention,
because the reflective adhesive film layer formed by the white EVA with the pre-crosslinking degree less than 50%, the white POE with the pre-crosslinking degree less than 12% or the white EVA with the melting index less than 12 replaces the lower-layer packaging adhesive film in the prior art, the reflective adhesive film layer has the characteristics of higher hardness and lower fluidity, the reflective adhesive film layer cannot overflow, the blocking of the reflective adhesive film layer on the upper surface of the cell slice is avoided, and the performance of the photovoltaic module is effectively improved.
In addition, the transparent film layer is arranged at least in a first edge area close to the second cell piece in the front surface of the first cell piece and/or a second edge area close to the first cell piece in the back surface of the second cell piece in two adjacent cell pieces, so that the problem of hidden cracking of the cell pieces can be solved, and the performance of the photovoltaic module is further improved.
By comparing the light reflection path (for clearly explaining the light reflection path, the structures of the solder strip 131, the transparent adhesive film layer 134, and the like are not drawn in fig. 5A and 5B) of the photovoltaic module provided by the embodiment of the invention shown in fig. 5A and 5B with the reflection path of the conventional photovoltaic module shown in fig. 12, 13, and 14, it can be known that, in the photovoltaic module provided by the embodiment of the invention, sunlight directly enters the white EVA layer of the reflective adhesive film layer, the reflection path is shortened, and the blocking of reflected light is reduced, thereby effectively improving the light reflectivity.
Different from the blocking of light rays in the prior art, the photovoltaic module provided by the embodiment of the invention eliminates unnecessary blocking, thereby effectively improving the light reflectivity, and improving the photoelectric conversion efficiency of the photovoltaic module, the power of the photovoltaic module and the like.
In the embodiment of the present invention, the transparent adhesive film layer shown in fig. 1, 2A to 4B, and 6 to 11 may be formed by melting the transparent adhesive film layer preset in the first edge region and/or the second edge region at a high temperature.
In an embodiment of the present invention, the transparent adhesive film layer shown in fig. 1, 6A and 6B, and 8 may be formed by melting a transparent adhesive film pre-disposed between the first cell piece and the second cell piece at a high temperature, wherein two side edges of the transparent adhesive film overlap the first edge region and the second edge region, respectively.
The high-temperature melting can ensure that the transparent adhesive film is adhered to a welding strip or a battery piece contacted with the transparent adhesive film by controlling the temperature and time (such as the temperature of 60 ℃, the melting time of 1s and the like), and the transparent adhesive film layer can be prevented from falling off while the transparent adhesive film layer is formed. The transparent adhesive film can be fixed on the battery piece through high-temperature melting, so that the buffering adhesive tape can not fall off in the carrying process of the battery string, in addition, in the laminating process, the face-to-face relative displacement between two battery surfaces connected by the same welding strip in the battery string can be prevented, and the situation that the battery surfaces press the welding strip to generate new hidden cracks is avoided.
Wherein, the transparent adhesive film can include: the transparent EVA adhesive film, the transparent POE adhesive film and the transparent EVA adhesive film and the transparent POE adhesive film form any one of the co-extrusion structures. The transparent adhesive film layer also has light transmission, and the shielding of the cell is reduced, so that the light receiving area of the cell is further improved.
In the embodiment of the invention, in order to meet the buffering force required by the battery piece in the laminating process, stabilize the battery piece and reduce the blocking of the transparent adhesive film layer to light, the mass distribution of the transparent adhesive film layer in the first edge area and/or the second edge area is 50-500 g/m2Within the range. I.e. a mass distribution of at least 50g/m2Maximum 500g/m2In a preferred embodiment, the mass distribution of the transparent adhesive film layer in the first edge area and/or the second edge area is 50-350 g/m2Within the range. In addition, the thickness of the transparent adhesive film layer is controlled within the range of 0.05-0.6 mm, namely the average thickness of the transparent adhesive film layer or the thickness of any position is equal to 0.05mm or 0.6mm or more than 0.05mm and is smaller than any value of 0.6 mm. In a preferred embodiment, the thickness of the transparent adhesive film layer is controlled within the range of 0.05-0.3 mm. The required buffer power of battery piece in order to satisfy the lamination process, can stabilize the battery piece simultaneously to reduce the transparent glued membrane layer and block the light.
In addition, the width of the transparent adhesive film layer can be within the range of 5-30 mm, so that the buffer force required by the cell in the laminating process is further met, the cell can be stabilized, and the blocking of the transparent adhesive film layer to light is reduced.
In the embodiment of the invention, in order to stabilize all the solder strips 131 in the cell and avoid relative displacement between the cell and the solder strips 131, the length of the transparent adhesive film layer is greater than or equal to the distance between two solder strips 131 which are farthest away in the cell. In addition, in order to further reduce the shielding of the transparent adhesive film layer on light, the length of the transparent adhesive film layer is less than or equal to that of the battery piece.
In the embodiment of the invention, the distance between two adjacent battery pieces is 0-3.0 mm. The space between two adjacent battery pieces is wider, so that different requirements on the photovoltaic assembly are met.
In an embodiment of the present invention, the back plate may be made of a glass material or a fluorine-containing coating.
It is worth to be noted that the transparent adhesive film, the upper packaging adhesive film and the bonding adhesive film which form the transparent adhesive film layer can be transparent EVA adhesive films with a melt index of 28-33, transparent POE adhesive films with a melt index of 5-15 and co-extrusion structures of the transparent EVA adhesive films and the transparent POE adhesive films.
As shown in fig. 15, the preparation process of the photovoltaic module provided in the foregoing embodiments may include the following steps:
step 1501, arranging a transparent film layer at least on the front side of the first battery piece of each battery string close to the first edge area of the second battery piece and/or the back side of the second battery piece close to the second edge area of the first battery piece;
in the step, a transparent adhesive film can be placed on the edge area through which the welding strip of at least one battery piece passes, and the transparent adhesive film is melted at high temperature to form a transparent adhesive film layer; or a transparent adhesive film is arranged between every two adjacent battery pieces and is melted at high temperature to form a transparent adhesive film layer, wherein two side edges of the transparent adhesive film are respectively lapped on the edge area through which the welding strip passes in the two adjacent battery pieces. A specific implementation mode that a transparent adhesive film is placed at the edge area through which the welding strip of at least one battery piece passes or a transparent adhesive film is arranged between every two adjacent battery pieces is as follows: supporting the welding strip, and placing a transparent adhesive film or a transparent adhesive film between the welding strip and the battery piece; another specific implementation manner can also be that the transparent adhesive film covering welding strip is directly placed on the edge area.
The transparent adhesive film or the transparent adhesive film used in this step includes: the transparent EVA adhesive film, the transparent POE adhesive film and the transparent EVA adhesive film and the transparent POE adhesive film form any one of the co-extrusion structures.
In addition, in the step, the mass distribution of the transparent adhesive film layer in the edge area of the battery piece through which the welding strip passes can be controlled to be 50-500 g/m2Within the range. And controlling the width of the transparent adhesive film layer within the range of 5-30 mm. The thickness of the transparent adhesive film layer is controlled within the range of 0.05-0.6 mm. And controlling the length of the transparent adhesive film layer to be larger than or equal to the distance between two welding strips with the farthest distance in the battery piece. The transparent adhesive film layer can prevent the battery piece from being hidden and cracked, and meanwhile, the shielding of light rays can be reduced as much as possible.
Step 1502, arranging the back plate, the reflective adhesive film layer, the battery string provided with the transparent adhesive film layer, the upper packaging adhesive film layer and the glass cover plate in sequence, and laminating to form the photovoltaic module.
Wherein, the reflection glue film layer can be specifically: is formed by white EVA with a pre-crosslinking degree of less than 50 percent or white POE with a pre-crosslinking degree of less than 12 percent; in a preferred embodiment, the reflective adhesive film layer is formed by white EVA with a pre-crosslinking degree of less than 45% or white POE with a pre-crosslinking degree of less than 10%.
In addition, a bonding adhesive film layer can be arranged between the reflecting adhesive film layer and the back plate, so that the reflecting adhesive film layer and the bonding adhesive film layer form a co-extrusion structure.
The photovoltaic module provided by the invention is explained in detail by several specific embodiments.
Example 1
Inserting a transparent EVA adhesive film with a melt index of 28-33 between the cell pieces to form a transparent adhesive film layer, selecting a white EVA adhesive film with a melt index of less than 12 or a pre-crosslinking degree of less than 50% as a reflective adhesive film layer, selecting a transparent EVA adhesive film with a melt index of 28-33 as an upper packaging adhesive film layer, and using a conventional back plate to obtain the structure of the photovoltaic module shown in figure 1. According to experimental tests, when a transparent adhesive film layer formed by a transparent EVA adhesive film with a melt index of 28-33 is laminated, the pressure of a white EVA adhesive film with a melt index of less than 12 or a pre-crosslinking degree of less than 50% on a battery piece and a welding strip can be relieved, and hidden cracks at the bending part of the welding strip are avoided. In addition, the white EVA adhesive film with the melt index less than 12 or the pre-crosslinking degree less than 50 percent can not generate overflow phenomenon. Higher light reflection can be obtained between the battery strings and on the back of the battery piece, so that the photovoltaic module has higher power.
Example 2
The method comprises the steps of replacing the transparent EVA of the embodiment 1 with a transparent POE with a melt index of 5-15, enabling the other materials to be consistent with the embodiment 1, laying the transparent POE between the first edge area of the front surface of the cell and the solder strip, enabling the structures of the other upper packaging adhesive films, the reflecting adhesive film layers and the like to be consistent with the embodiment 1, and obtaining the structure of the photovoltaic module shown in the figure 2A. This embodiment can be applied to a single glass assembly.
A transparent glue film layer may also be laid over the solder strips of the first edge region, such as the structure of the photovoltaic module shown in fig. 2B.
Example 3
Lay transparent glued membrane (transparent EVA or transparent POE or transparent EVA and transparent POE coextrusion structure) between the first marginal zone of the front of battery piece and welding the area and between the second marginal zone of the back of battery piece and welding the area, structure such as upper encapsulation glued membrane, reflection rete, backplate are unanimous with embodiment 1. A structure of the photovoltaic module shown in fig. 3A is obtained. This embodiment can be applied to a dual glass assembly.
The transparent adhesive film layer may also be laid over the solder strips of the first edge region and under the solder strips of the second edge region, such as the structure of a photovoltaic module shown in fig. 3B.
Example 4
And (3) paving a transparent adhesive film (transparent EVA or transparent POE or a transparent EVA and transparent POE co-extrusion structure) between the second edge area of the back of the battery piece and the welding strip, wherein the upper packaging adhesive film, the reflecting adhesive film layer, the back plate and other structures are consistent with those in the embodiment 1. A structure of the photovoltaic module shown in fig. 4A is obtained.
The transparent adhesive film layer may also be laid under the solder strip of the second edge region, such as the structure of a photovoltaic module shown in fig. 4B.
Example 5
Inserting a transparent EVA adhesive film with a melt index of 28-33 between the battery pieces to form a transparent adhesive film layer, and selecting a white EVA adhesive film with a melt index of less than 12 (or a white EVA adhesive film with a pre-crosslinking degree of less than 50%) and a transparent EVA adhesive film co-extrusion structure as a reflective adhesive film layer, wherein the transparent EVA adhesive film in the co-extrusion structure is bonded with the back plate, and the white EVA adhesive film with a melt index of less than 12 (or a white EVA adhesive film with a pre-crosslinking degree of less than 50%) is positioned above the transparent EVA adhesive film in the co-extrusion structure. Further, a transparent EVA (ethylene vinyl acetate) adhesive film with a melt index of 28-33 is selected as an upper-layer packaging adhesive film, and a conventional back sheet (or a back sheet with a KPC/KPF structure, wherein a C layer and an F layer of the KPC/KPF structure are Coating fluorine film layers) is used, so that the structure of the photovoltaic module shown in FIG. 8 can be obtained. It can be known from experimental tests that besides the advantages of embodiment 1, the transparent adhesive film in the co-extrusion structure can be used for bonding with the back panel, because the bonding strength of the white EVA is reduced after the white filler is added, especially when the back panel structure is KPC/KPF, the C layer and the F layer are Coating fluorine film layers, the surface energy is low, the risk of insufficient bonding strength with the white EVA is caused, the assembly delamination is easily caused by long-term aging, and the bonding strength of the white EVA and the back panel can be improved by the structure provided by embodiment 2.
Example 6
Placing a transparent EVA adhesive film with a melt index of 28-33 between a first edge area of a battery piece and a welding strip to form a transparent adhesive film layer, and selecting a white EVA adhesive film with a melt index of less than 10 (or a white EVA adhesive film with a pre-crosslinking degree of less than 45%) and a transparent EVA adhesive film co-extrusion structure as a lower-layer packaging adhesive film, wherein the transparent EVA adhesive film in the co-extrusion structure is bonded with a back plate, and the white EVA adhesive film with a melt index of less than 10 (or a white EVA adhesive film with a pre-crosslinking degree of less than 45%) is positioned above the transparent EVA adhesive film in the co-extrusion structure. And further selecting a transparent EVA (ethylene vinyl acetate) adhesive film with a melt index of 28-33 as an upper packaging adhesive film, and forming the structure shown in FIG. 9 by using a conventional back sheet (or a back sheet with a KPC/KPF structure, wherein a C layer and an F layer of the KPC/KPF structure are Coating fluorine film layers).
Example 7
Placing transparent POE glue films with the melt index of 5-15 between the first edge area of the cell and the welding strip and between the second edge area of the cell and the welding strip to form transparent glue films, wherein the other structures are consistent with those of the embodiment 5, and obtaining the structure shown in figure 10.
Example 8
The method comprises the steps of selecting transparent POE with a melt index of 5-15 as a transparent adhesive film, placing the transparent POE adhesive film with the melt index of 5-15 between a second edge area of a battery piece and a welding strip to form the transparent adhesive film layer, and obtaining the structure shown in figure 11, wherein other structures are consistent with embodiment 5.
Example 9
The transparent EVA of the embodiment 1 is replaced by transparent POE with the melt index of 5-15, and the white EVA of the embodiment 1 is replaced by white POE with the pre-crosslinking degree of less than 12%.
Example 10
The transparent EVA of the embodiment 5 is replaced by transparent POE with the melt index of 5-15, and the white EVA of the embodiment 2 is replaced by white POE with the pre-crosslinking degree of less than 12%.
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 (9)

1. A photovoltaic module is characterized by comprising a glass cover plate (11), an upper packaging adhesive film (12), a plurality of battery strings (13) which are connected in series and/or in parallel, a reflecting adhesive film layer (14) and a back plate (15) which are sequentially arranged from top to bottom,
each battery string (13) comprises a plurality of battery pieces, the front side and the back side of each battery piece are respectively provided with a main grid, and the main grid on the front side of the first battery piece of every two adjacent battery pieces is connected with the main grid on the back side of the second battery piece through a welding strip (131);
a transparent adhesive film layer (134) is arranged at least on the front side of the first battery piece and close to the first edge area (132) of the second battery piece and/or on the back side of the second battery piece and close to the second edge area (133) of the first battery piece; the reflecting film layer (14) is formed by white EVA with the pre-crosslinking degree of less than 50%, white POE with the pre-crosslinking degree of less than 12% or white EVA with the melting index of less than 12.
2. The photovoltaic module of claim 1,
-providing a transparent adhesive film in the first edge area (132) and/or the second edge area (133) in advance;
alternatively, the first and second electrodes may be,
a transparent adhesive film is arranged between the first battery piece and the second battery piece in advance and two sides of the transparent adhesive film are respectively overlapped on the first edge area (132) and the second edge area (133),
and then heating to form the transparent adhesive film layer (134).
3. The photovoltaic module of claim 2,
the transparent adhesive film comprises: the transparent EVA adhesive film, the transparent POE adhesive film and the transparent EVA adhesive film and the transparent POE adhesive film form any one of the co-extrusion structures.
4. The photovoltaic module of claim 1,
the transparent adhesive film layer (134) is arranged between the first edge area (132) and the welding strip (131);
and/or the presence of a gas in the gas,
the transparent adhesive film layer (134) is arranged between the second edge area (133) and the welding strip (131).
5. The photovoltaic module of claim 1,
the transparent adhesive film layer (134) covers the welding strip (131) of the first edge area (132);
and/or the presence of a gas in the gas,
the transparent adhesive film layer (134) covers the welding strip (131) of the second edge area (133);
and/or the presence of a gas in the gas,
the transparent adhesive film layer (134) covers the welding strip (131) between the first battery piece and the second battery piece.
6. The photovoltaic module of claim 1, further comprising: an adhesive film layer (16) positioned below the reflective film layer (14).
7. The photovoltaic module of claim 6,
the adhesive film layer (16) is formed by any one of a transparent EVA adhesive film, a transparent POE adhesive film and a co-extrusion structure formed by the transparent EVA adhesive film and the transparent POE adhesive film.
8. The photovoltaic module of claim 1,
the distance between two adjacent battery pieces is 0-3.0 mm.
9. A method for preparing a photovoltaic module according to any one of claims 1 to 8, characterized in that it comprises:
step 1, arranging a transparent film layer at least on a first edge area of the front side of a first battery piece of each battery string, which is close to a second battery piece, and/or a second edge area of the back side of the second battery piece, which is close to the first battery piece;
and 2, sequentially arranging the back plate, the reflecting adhesive film layer, the battery string provided with the transparent adhesive film layer, the upper packaging adhesive film and the glass cover plate, and laminating to form the photovoltaic module.
CN202110882642.9A 2021-08-02 2021-08-02 Photovoltaic module and preparation method thereof Pending CN113611763A (en)

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CN114639749A (en) * 2022-05-20 2022-06-17 英利能源发展有限公司 Photovoltaic module and packaging method thereof
CN115050850A (en) * 2022-07-13 2022-09-13 晶澳(扬州)新能源有限公司 Battery string, photovoltaic module and preparation method
CN115036397A (en) * 2022-08-10 2022-09-09 英利能源发展有限公司 Preparation method of high-conversion-efficiency hetero-crystalline silicon battery assembly
CN115588716A (en) * 2022-11-24 2023-01-10 晶科能源(海宁)有限公司 Method for producing a photovoltaic module and photovoltaic module

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