CN109713072B - Solar cell module - Google Patents
Solar cell module Download PDFInfo
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- CN109713072B CN109713072B CN201910024062.9A CN201910024062A CN109713072B CN 109713072 B CN109713072 B CN 109713072B CN 201910024062 A CN201910024062 A CN 201910024062A CN 109713072 B CN109713072 B CN 109713072B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a back plate of a solar cell module. The back plate comprises a substrate and a pattern layer which is arranged on the inner side surface of the substrate and contains a water blocking material, wherein the pattern layer is provided with a preset pattern. According to the invention, the pattern layer containing the water blocking material is arranged on the inner side surface of the back plate, and the water blocking performance of the water blocking material is utilized to reduce the water vapor transmittance, prevent water vapor from penetrating through the back plate to the front side of the battery piece and prevent the battery piece from losing efficacy, so that the power of the assembly is improved.
Description
Technical Field
The invention belongs to the technical field of solar cells, and particularly relates to a solar cell module.
Background
At present, the basic structure of a crystalline silicon solar cell module sequentially comprises front glass, an upper layer packaging material, a cell sheet layer, a lower layer packaging material and a back plate or back glass, wherein the commonly used back plate is a white polymer composite layer. The polymer composite layer consists of an outer layer, a middle layer and an inner layer, wherein bonding materials are arranged between the outer layer and the middle layer and between the middle layer and the inner layer. In the market, solar cell back sheets are mainly classified into fluorine-containing back sheets and fluorine-free back sheets. The fluorine-containing back plate comprises two types, namely double-sided fluorine-containing (such as TPT, KPK and KPF, wherein the first letter represents an outer layer, the middle letter represents a middle layer, and the last letter represents an inner layer) and single-sided fluorine-containing (such as TPE, KPE and KPO, wherein the first letter represents the outer layer, the middle letter represents the middle layer, and the last letter represents the inner layer), wherein T refers to a polyvinyl fluoride (PVF) film, K refers to a polyvinylidene fluoride (PVDF) film, and F refers to a fluorine coating resin coating; p refers to biaxially oriented polyethylene terephthalate film (BOPET); e denotes a polyethylene film or Ethylene Vinyl Acetate (EVA) resin, and O is a polyolefin resin. The back sheet without fluorine is mostly formed by gluing and compounding multiple layers of PET or PA by using an adhesive.
When the photovoltaic module is used outdoors, especially in a high-temperature and high-humidity environment such as a water surface, water vapor can penetrate through the back plate and permeate into the front surface of the battery piece from an area which is not shielded by the battery piece, so that the power of the module is reduced.
Disclosure of Invention
The invention aims to provide a solar cell module with a water blocking function, which can enhance the water blocking performance of a back plate, reduce the water vapor from permeating into the front side of a cell through the back plate, improve the outdoor application performance of the module and further ensure the high-efficiency output of the module.
In order to achieve the above object, the present invention provides the following technical solutions.
The back sheet comprises a substrate and a pattern layer which is arranged on the inner side surface of the substrate and provided with a preset pattern and contains a water blocking material.
Optionally, the solar cell module sequentially comprises front glass, an upper layer of packaging material, a cell sheet layer, a lower layer of packaging material and a back plate, and the pattern of the pattern layer containing the water blocking material is matched with the pattern of the non-shielded area of the cell sheet in the cell sheet layer.
Optionally, the pattern in the pattern layer containing the water blocking material is in a grid shape or a strip shape.
Optionally, the pattern layer containing water blocking material is formed by curing a paint containing water blocking material with the preset pattern, which is arranged on the inner side surface of the substrate.
In the present invention, the coating material containing the water-blocking material may be a thermosetting coating material, and preferably a low-temperature curing coating material (curing temperature is 60 ℃ or lower). When the pattern layer containing the water blocking material is prepared, coating the paint containing the water blocking material on the inner side surface of the substrate according to the pattern of the pattern layer containing the water blocking material, and curing the paint to form the pattern layer containing the water blocking material.
The coating containing the water-blocking material may be disposed on the inside surface of the substrate by means of web coating, printing, spraying, coating, or the like.
The coating containing the water-blocking material may be a conventional commercially available coating containing a water-blocking material, and is more preferably a coating containing a water-blocking material for use on a backsheet, such as a coating containing a water-blocking material disclosed in patent CN 104403602B.
Optionally, the substrate comprises an outer layer comprising fluorine, a non-fluorine containing intermediate layer disposed on the outer layer, and an inner layer disposed on the intermediate layer, the pattern layer comprising water blocking material disposed on the inner layer; and bonding layers are arranged between the outer layer and the middle layer and between the middle layer and the inner layer.
Optionally, the inner layer contains fluorine or no fluorine.
Optionally, the inner layer covers the entire intermediate layer, or the inner layer covers a partial region of the intermediate layer.
Optionally, the inner layer has the same pattern as the pattern layer containing water blocking material.
Optionally, the substrate is formed by compounding multiple layers of fluorine-free polymer material layers.
Technical effects
The invention has the following beneficial effects:
(1) according to the invention, the pattern layer containing the water blocking material is arranged on the inner side surface of the back plate, and the water blocking performance of the water blocking material is utilized, so that the water vapor transmission rate is reduced, the water vapor is prevented from penetrating to the front side of the battery piece through the back plate, especially, the water vapor is prevented from penetrating to the front side of the battery piece from the area of the back plate which is not shielded by the battery piece, the failure of the battery piece is prevented, and the power of the assembly is improved.
(2) The material of the pattern layer containing the water-blocking material can be selected from the pattern layer containing the water-blocking material, which is prepared by directly adopting a coating containing the water-blocking material arranged in a spraying, coating or printing mode and the like and curing at low temperature, and the method is easy to realize.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a plan view of a solar photovoltaic module in example 1-2;
fig. 2 is a top view of a solar photovoltaic module in example 3;
FIG. 3 is a schematic structural view of a solar photovoltaic module according to embodiment 1-2;
fig. 4 is a schematic structural view of a solar photovoltaic module in example 3;
FIG. 5 is a schematic structural view of a back sheet for a solar photovoltaic module comprising a pattern layer of a water blocking material according to example 1-2;
fig. 6 is a schematic structural view of a back sheet of a solar photovoltaic module comprising a pattern layer of a water blocking material according to example 3;
the reference numerals in the drawings denote:
1 is an outer layer;
2 is an intermediate layer;
3 is an inner layer;
31 is a pattern layer containing water-blocking material;
4 is a bonding layer;
5 is front glass;
6 is an upper layer packaging material;
7 is a battery sheet layer;
8 is a lower layer packaging material;
9 is a back plate;
10 is a cell in the cell layer;
and 11 is a battery piece non-shielding area in the battery piece layer.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail.
In the invention, the inner side of the back plate refers to the side of the back plate facing the battery piece after the back plate is installed in the solar battery module; it is understood that the side of the back plate away from the battery piece is the outer side of the back plate.
Fig. 1 shows a structure of a back sheet for a solar cell module according to the present invention, and as shown in fig. 1, the back sheet includes a substrate, and a pattern layer 31 containing a water blocking material and having a predetermined pattern on an inner surface of the substrate.
In the back plate of the solar cell module, the pattern layer 31 containing the water blocking material is arranged on the inner side surface of the substrate, namely the material layer with the water blocking performance is arranged on the local area of the inner side surface of the substrate, and the water blocking performance of the water blocking material is utilized to reduce the water vapor transmittance, prevent the water vapor from penetrating through the back plate to the front surface of the cell and prevent the cell from losing efficacy, thereby improving the power of the module.
Fig. 3 and 4 respectively show the structure of a solar cell module, which comprises a front glass 5, an upper layer of an encapsulating material 6, a cell sheet layer 7, a lower layer of an encapsulating material 8, and a back sheet 9 in this order, as shown in fig. 3 and 4.
For the solar cell module, moisture can easily permeate from the gaps between the cells (i.e. the non-shielded areas of the cells) to the front surfaces of the cells, so in an alternative implementation of the invention, the pattern of the pattern layer 31 containing the water blocking material is matched with the pattern of the non-shielded areas of the cells in the cell layer 7, i.e. the pattern layer 31 containing the water blocking material is arranged on the inner surface of the back sheet at the position corresponding to the non-shielded areas 11 of the cells 10 in the cell layer of the back sheet 9 of the solar cell module.
As shown in fig. 5, the pattern of the pattern layer 31 containing the water blocking material is in a grid shape, and the back sheet is suitable for a solar cell module in which the cells are connected by solder strips and a certain gap is formed between the cells.
As shown in fig. 6, the pattern of the pattern layer 31 containing the water blocking material is a strip, and the back sheet is suitable for a laminated assembly, that is, adjacent battery cells in the same battery string are connected in a laminated manner, no gap is formed between the adjacent battery cells in the same battery string, and a gap is formed between the adjacent battery strings.
Of course, in the present invention, the pattern of the pattern layer 31 containing the water blocking material is not limited to a grid or a strip, and may be set according to the type of the assembly, and the pattern may correspond to an area of the battery sheet layer that is not blocked by the battery sheet.
In the present invention, the pattern layer 31 containing a water blocking material may be formed by curing a paint containing a water blocking material having a predetermined pattern disposed on the inner surface of the substrate.
In the present invention, the coating material containing the water-blocking material may be a thermosetting coating material, and preferably a low-temperature curing coating material (curing temperature is 60 ℃ or lower). When the pattern layer containing the water blocking material is prepared, coating the paint containing the water blocking material on the inner side surface of the substrate according to the pattern of the pattern layer containing the water blocking material, and curing the paint to form the pattern layer containing the water blocking material.
The coating containing the water-blocking material may be disposed on the inside surface of the substrate by means of web coating, printing, spraying, coating, or the like.
The coating containing the water-blocking material may be a conventional commercially available coating containing a water-blocking material, and is more preferably a coating containing a water-blocking material for use on a backsheet, such as a coating containing a water-blocking material disclosed in patent CN 104403602B.
As shown in fig. 1 and 2, the substrate may include an outer layer 1 containing fluorine, an intermediate layer 2 containing no fluorine disposed on the outer layer 1, and an inner layer 3 disposed on the intermediate layer 2, a pattern layer 31 containing a water blocking material disposed on the inner layer 3; bonding layers 4 are arranged between the outer layer 1 and the middle layer 2 and between the middle layer 2 and the inner layer 3.
In this embodiment, the inner surface of the inner layer 3 is the inner surface of the substrate.
The outer layer 1 may be a film made of a fluorine-containing material such as a polyvinyl fluoride (PVF) film or a polyvinylidene fluoride (PVDF) film, and the intermediate layer 2 may be a biaxially oriented polyethylene terephthalate (BOPET), a polyethylene film (PE), or a polyamide film (PA).
The inner layer 3 may be a fluorine-containing film such as a vinyl fluoride film or a vinylidene fluoride film, or may be a film containing no fluorine such as a polyethylene film, an ethylene-vinyl acetate resin film, or a polyolefin resin film.
In the present invention, the inner layer 3 of the substrate may cover the entire intermediate layer 2 (as shown in fig. 1) or may cover only a partial region of the intermediate layer 2 (as shown in fig. 2). In one possible implementation, the inner layer 3 has the same pattern as the patterned layer 31 containing the water-blocking material.
For backsheets in which the inner layer 3 of the substrate covers all of the intermediate layer 2, the patterned layer 31 containing water blocking material may be provided directly on the inner layer of an existing double-or single-sided fluorine-containing backsheet.
For the back sheet with the inner layer 3 of the substrate covering the local area of the middle layer 2, the composite film of the outer layer 1 and the middle layer 2 can be prepared according to the existing preparation process of the back sheet, then the inner layer 3 is adhered on the local area of the middle layer 2, and then the pattern layer 31 containing the water blocking material is prepared on the inner layer 3.
In the present invention, the substrate may also be formed by laminating a plurality of fluorine-free polymer material layers, such as a plurality of PET films or a plurality of PA films. In this embodiment, the pattern layer 31 containing the water blocking material is directly disposed on the surface of the fluorine-free polymer material layer of the innermost layer.
In the present invention, the material of the adhesive layer 4 at each position is not particularly limited as long as each part of the backsheet can be adhesively fixed. For example, the adhesive layer formulations disclosed in examples 1 to 5 of CN107759983A can be used.
The back sheet of a solar cell module according to the present invention is further described with reference to the following specific examples.
Example 1
As shown in fig. 1, the back sheet of a solar cell module provided in this embodiment includes a substrate and a pattern layer 31 containing a water blocking material disposed on an inner surface of the substrate.
Wherein, the base is current single face fluorine-containing TPE backplate, and the base includes outer 1 promptly, locates intermediate level 2 on outer 1, locates inlayer 3 on intermediate level 2 and sets up between outer 1 and intermediate level 2, tie coat 4 between intermediate level 2 and inlayer 3, and the skin is the polyvinyl fluoride film, and intermediate level 2 is the polyethylene terephthalate film, and inlayer 3 is the polyethylene film.
A pattern layer 31 containing a water blocking material is provided on the inner layer 3.
The pattern layer 31 containing the water blocking material is formed by curing a water blocking paint having a predetermined pattern coated on the inner layer 3 at a low temperature.
The formula of the water-blocking paint is as in patent CN 104403602B, and specifically comprises the following raw materials in parts by weight: 32 parts of ethylene-vinyl acetate copolymer emulsion, 5 parts of polyurethane emulsion, 3 parts of epoxy resin, 8 parts of polyvinyl alcohol, 3 parts of turpentine, 6 parts of talcum powder, 10 parts of ethylene diamine tetraacetic acid, 7 parts of magnesium stearate, 16 parts of isopropanol and 26 parts of water;
when the water-blocking paint is prepared, the ethylene-vinyl acetate copolymer emulsion, the polyurethane emulsion and the epoxy resin are added into isopropanol, the temperature is raised to 45 ℃, the mixture is uniformly stirred, then the polyvinyl alcohol, the turpentine, the talcum powder and the ethylene diamine tetraacetic acid are sequentially added, the temperature is raised to 55 ℃, and the mixture is stirred for 30min, so that the water-blocking paint is obtained.
As shown in fig. 3, the solar cell module sequentially comprises front glass 5, an upper layer of packaging material 6, a cell sheet layer 7, a lower layer of packaging material 8 and a back sheet 9, wherein the cell sheets 10 in the cell sheet layer 7 are connected through solder strips, and gaps are formed among the cell sheets 10. The pattern of the pattern layer 31 containing the water blocking material is matched with the pattern of the non-blocked area 11 of the battery piece 10 in the battery piece layer, and is in a grid shape as shown in fig. 5.
The water-blocking paint is coated on the area, which is not covered by the battery pieces, on the inner layer 3, and after natural cooling, the back plate with the latticed water-blocking material pattern layer is formed as shown in fig. 5.
The back plate provided by the embodiment is applied to a solar cell module, so that water vapor can be prevented from permeating the front surface of the cell from the non-shielded area of the cell, the cell is prevented from losing efficacy, and the power of the module is improved.
Example 2
As shown in fig. 1, the back sheet of a solar cell module provided in this embodiment includes a substrate and a pattern layer 31 containing a water blocking material disposed on an inner surface of the substrate.
Wherein, the base is current two-sided fluorine-containing TPT backplate, and the base includes outer 1 promptly, locates intermediate level 2 on outer 1, locates inlayer 3 on intermediate level 2 and sets up between outer 1 and intermediate level 2, tie coat 4 between intermediate level 2 and inlayer 3, and the skin is the polyvinyl fluoride film, and intermediate level 2 is the polyethylene glycol terephthalate film, and inlayer 3 is the polyvinyl fluoride film.
A pattern layer 31 containing a water blocking material is provided on the inner layer 3.
The pattern layer 31 containing the water blocking material is formed by curing the water blocking material with a preset pattern coated on the inner layer 3 at a low temperature.
The formulation of the water-blocking material was the same as in example 1.
As shown in fig. 3, the solar cell module sequentially comprises front glass 5, an upper layer of packaging material 6, a cell sheet layer 7, a lower layer of packaging material 8 and a back sheet 9, wherein the cell sheets 10 in the cell sheet layer 7 are connected through solder strips, and gaps are formed among the cell sheets 10. The pattern of the pattern layer 31 containing the water blocking material is matched with the pattern of the non-blocked area 11 of the battery piece 10 in the battery piece layer, and is in a grid shape as shown in fig. 5.
Example 3
As shown in fig. 2, the back sheet of a solar cell module provided in this embodiment includes a substrate and a pattern layer 31 containing a water blocking material disposed on an inner surface of the substrate.
As shown in fig. 2, the back sheet of a solar cell module provided in this embodiment includes a substrate and a pattern layer 31 containing a water blocking material disposed on an inner surface of the substrate.
The substrate comprises an outer layer 1, an intermediate layer 2 arranged on the outer layer 1, an inner layer 3 arranged on the intermediate layer 2 and bonding layers 4 arranged between the outer layer 1 and the intermediate layer 2 and between the intermediate layer 2 and the inner layer 3, wherein the inner layer 3 covers a local area of the intermediate layer 2, and the pattern of the inner layer 3 is the same as that of a pattern layer 31 containing a water blocking material.
The outer layer is a polyvinyl fluoride film, the middle layer 2 is a polyethylene terephthalate film, and the inner layer 3 is a polyvinyl fluoride film.
A pattern layer 31 containing a water blocking material is provided on the inner layer 3.
The pattern layer 31 containing the water blocking material is formed by curing a water blocking paint having a predetermined pattern printed on the inner layer 3 at a low temperature.
The formulation of the water-blocking paint in this example is the same as that of example 1.
As shown in fig. 4, the solar cell module sequentially comprises front glass 5, an upper layer of packaging material 6, a cell sheet layer 7, a lower layer of packaging material 8 and a back plate 9, wherein the cells in the cell sheet layer 7 are connected in a shingled manner, and no gap exists between the cells in the same string of cells; the pattern in the pattern layer 31 containing the water blocking material and the pattern of the inner layer 3 are matched with the pattern of the non-blocked area 11 of the battery piece 10 in the battery piece layer and are in a strip shape as shown in fig. 6.
The present invention is illustrated by the following examples, which are not intended to limit the scope of the invention. Other insubstantial modifications and adaptations of the present invention can be made without departing from the scope of the present invention.
Claims (8)
1. A solar cell module is characterized by sequentially comprising front glass (5), an upper packaging material (6), a cell sheet layer (7), a lower packaging material (8) and a back plate (9), wherein the back plate comprises a substrate and a pattern layer (31) which is arranged on the inner side surface of the substrate and contains a water blocking material and is provided with a preset pattern; the pattern of the pattern layer (31) containing the water blocking material is matched with the pattern of the non-shielded area of the battery piece in the battery piece layer (7).
2. The solar cell module of claim 1, wherein: the pattern in the pattern layer (31) containing the water blocking material is in a grid shape or a strip shape.
3. The solar cell module of claim 1, wherein: the pattern layer (31) containing the water blocking material is formed by curing the paint containing the water blocking material with the preset pattern, which is arranged on the inner side surface of the substrate.
4. Solar module according to claim 1, characterized in that the substrate comprises an outer layer (1) comprising fluorine, an intermediate layer (2) not comprising fluorine arranged on the outer layer (1) and an inner layer (3) arranged on the intermediate layer (2), the pattern layer (31) comprising water-blocking material being arranged on the inner layer (3); the adhesive layer (4) is arranged between the outer layer (1) and the middle layer (2) and between the middle layer (2) and the inner layer (3).
5. Solar cell module according to claim 4, characterized in that the inner layer (3) contains fluorine or no fluorine.
6. Solar cell module according to claim 4, characterised in that the inner layer (3) covers the entire intermediate layer (2) or that the inner layer (3) covers a partial region of the intermediate layer (2).
7. Solar module according to claim 6, characterized in that the inner layer (3) has the same pattern as the patterned layer (31) containing water-blocking material.
8. The solar cell module as claimed in claim 1, wherein the substrate is formed by compounding a plurality of fluorine-free polymer material layers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910024062.9A CN109713072B (en) | 2019-01-10 | 2019-01-10 | Solar cell module |
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| CN201910024062.9A CN109713072B (en) | 2019-01-10 | 2019-01-10 | Solar cell module |
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| CN109713072A CN109713072A (en) | 2019-05-03 |
| CN109713072B true CN109713072B (en) | 2021-09-14 |
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| CN102222711A (en) * | 2010-04-16 | 2011-10-19 | 江苏百世德太阳能高科技有限公司 | Novel silicon base film solar battery and packaging method thereof |
| KR102113839B1 (en) * | 2013-07-29 | 2020-05-21 | 엘지전자 주식회사 | Back sheet and solar cell module including the same |
| CN105489683A (en) * | 2016-01-20 | 2016-04-13 | 常州亚玛顿股份有限公司 | Lightweight double-glass module |
| CN107154443A (en) * | 2016-03-03 | 2017-09-12 | 苏州升奥新能源有限公司 | A kind of solar cell module encapsulating structure |
| CN108173336A (en) * | 2018-02-08 | 2018-06-15 | 耀灵科技（上海）有限公司 | flexible solar charger and manufacturing method |
| CN108767036A (en) * | 2018-06-01 | 2018-11-06 | 汉能新材料科技有限公司 | A kind of solar panel |
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Patent Citations (3)
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|---|---|---|---|---|
| CN205335270U (en) * | 2015-12-23 | 2016-06-22 | 比亚迪股份有限公司 | Back of body contact solar cell's electrically conductive backsheet layer and battery pack |
| CN107759983A (en) * | 2017-10-13 | 2018-03-06 | 杭州福斯特应用材料股份有限公司 | A kind of patterned transparent back veneer material |
| CN108767042A (en) * | 2018-05-24 | 2018-11-06 | 苏州中来光伏新材股份有限公司 | A kind of reflection gain type high transmittance solar battery back film and preparation method thereof |
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