CN210429840U - Flexible thin-film solar cell packaging structure - Google Patents
Flexible thin-film solar cell packaging structure Download PDFInfo
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- CN210429840U CN210429840U CN201921180064.9U CN201921180064U CN210429840U CN 210429840 U CN210429840 U CN 210429840U CN 201921180064 U CN201921180064 U CN 201921180064U CN 210429840 U CN210429840 U CN 210429840U
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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
- Y02E10/52—PV systems with concentrators
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Abstract
The utility model relates to a solar cell technical field particularly, relates to a with flexible thin-film solar cell packaging structure. The flexible thin-film solar cell packaging structure comprises a front plate, a cell chip and a back plate which are sequentially arranged, and further comprises a coating layer, wherein the coating layer is arranged inside the front plate or on one side of the front plate, which faces the cell chip, and is a first refraction layer and a second refraction layer which are alternately arranged, the first refraction layer is formed on the substrate, the refraction rate of the material of the first refraction layer is higher than that of the material of the substrate, and the refraction rate of the material of the second refraction layer is lower than that of the material of the substrate. The coating film layer realizes the film system design with high and low refractive index alternation, realizes color display according to the interference of light, is a coating structure on the surface of a plate, and compared with a color optical film used in the prior art, cannot influence the lamination process flow of a flexible thin-film solar cell product.
Description
Technical Field
The utility model relates to a solar cell technical field particularly, relates to a with flexible thin-film solar cell packaging structure.
Background
At present, the solar cell industry is one of green renewable energy sources, and is an energy industry vigorously promoted and developed by the nation. However, thin-film solar cells currently have great challenges, mainly how to improve the design and quality assurance of the current solar cell and module manufacturing process and related materials through technical innovation, and continuously reduce the cost of solar cell power generation. The flexible thin-film solar cell is different from a glass solar cell module, is light, thin and flexible, provides infinite possibility for the field of mobile energy, and puts new requirements on the appearance and the packaging barrier property of products facing markets and consumers. The flexible thin-film solar cell realizes the characteristic of flexibility in mobile energy products, but the flexible thin-film solar cell component in the existing packaging is transparent, the color of the cell chip is displayed, and the appearance of the product can be influenced by the lead on the chip.
Aiming at the current situation of the existing products, in the prior art, a layer of color optical film is often added between the frosted PET/ETFE of the front plate and the water-blocking film to realize the display of color patterns, but in order to realize the lamination, the addition of the layer of material needs to add adhesive films on two sides of the color optical film, which can affect the lamination process flow and the lamination cost of the products and bring negative effects while realizing the effect.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the purpose that can not influence the lamination technology when solving the colour display problem is realized, the utility model provides a new flexible thin-film solar cell packaging structure.
According to the embodiment of the utility model provides a pair of flexible thin-film solar cell packaging structure, it is including front bezel, battery chip and the backplate that sets gradually, and it still includes the coating film layer, the coating film layer sets up the inside or the setting of front bezel are in the front bezel orientation one side of battery chip, the coating film layer is first refraction layer and the second refraction layer of setting up in turn, at first forms first refraction layer just on the substrate the refracting index of first refraction layer material is higher than the refracting index of substrate material, the refracting index of second refraction layer material is less than the refracting index of substrate material.
Furthermore, the front plate is of an integrated structure, and the coating layer is arranged on one side, facing the battery chip, of the front plate.
Further, the surface of the front plate, which is away from the battery chip, is provided with a frosting layer, a diamond-like coating or a silicon oxide layer.
Furthermore, the front plate comprises a first front plate packaging layer and a second front plate packaging layer, the coating layer is arranged on one side of the second front plate packaging layer, the first front plate packaging layer is connected with the second front plate packaging layer through a first adhesive film layer, and the second front plate packaging layer is connected with the battery chip through a second adhesive film layer.
Furthermore, the color saturation C of the film coating layer in the range of the reflection angleab *Higher than 10, wherein:
a*and b*Are the CIE color coordinates under daylight illuminant CIE-D65.
Furthermore, the coating layer is a silicon nitride coating layer, an aluminum oxide coating layer, a silicon nitride coating layer and an aluminum oxide coating layer which are arranged in sequence.
Further, the thickness uniformity of the coating layer is +/-2.5%, the surface of the coating layer is treated by oxygen plasma, and the surface tension of the coating layer is not less than 38 dyn/cm.
Further, the material of the first packaging layer of the front plate is selected from at least one of frosted PET, matte ETFE, matte FEP and matte FEP; the second packaging layer of the front plate is a PET substrate.
Furthermore, the back plate comprises a first back plate packaging layer and a second back plate packaging layer, the first back plate packaging layer is connected with the battery chip through a third adhesive film layer, and the first back plate packaging layer is connected with the second back plate packaging layer through a fourth adhesive film layer.
Further, the third adhesive film layer is made of POE; the third adhesive film layer is made of EVA or POE; the first packaging layer of the back plate is made of aluminum PET; the second packaging layer of the back plate is made of cloth.
The utility model discloses a coating film layer among the flexible thin-film solar cell packaging structure is the first refraction layer and the second refraction layer of setting in turn, has realized the design of high low refraction alternating membrane system, realizes the colored demonstration according to the interference of light, and the coating film layer is the cladding material structure on panel surface, compares in the colored optical film who uses among the prior art, can not influence the lamination process flow of flexible thin-film solar cell product.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and further features, objects, and advantages of the invention will become apparent. The drawings of the illustrative embodiments and their description are provided to explain the present invention and do not constitute an undue limitation on the invention. In the drawings:
fig. 1 schematically shows a structure diagram of a flexible thin film solar cell package according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
fig. 3 schematically shows a structural diagram of another flexible thin film solar cell package according to an embodiment of the present invention; and
fig. 4 is a partially enlarged view of a portion B in fig. 3.
In the figure:
1. a front plate; 11. a front plate first encapsulation layer; 12. a front plate second packaging layer; 2. a battery chip; 3. a back plate; 31. a first packaging layer of the back plate; 32. a second packaging layer of the back plate; 4. a first adhesive film layer; 5. a second adhesive film layer; 6. a third adhesive film layer; 7. a fourth adhesive film layer; 8. and (7) coating a film layer.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings are intended to cover non-exclusive inclusions, such that a system, product or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
In the present invention, the terms "upper", "lower", "inner", "middle", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The invention will be described in detail with reference to the accompanying figures 1-4, in conjunction with an embodiment.
The flexible thin-film solar cell packaging structure provided by the embodiment of the application comprises a front plate 1, a cell chip 2 and a back plate 3 which are sequentially arranged. In this structure, sunlight is incident from the front plate 1, passes through the front plate 1 and the adhesive film between the front plate 1 and the cell chip 2, reaches the cell chip 2 of the thin-film solar cell, and is converted into electric energy. A very important characteristic of the front plate 1 is the high light transmittance, ensuring that sufficient light enters to increase the light conversion efficiency as much as possible; meanwhile, one side surface of the front plate 1 is also used as a direct contact layer of the cell chip 2 of the thin film solar cell, and the front plate must have a function of protecting the cell chip 2 from water and oxygen corrosion, which is a key for ensuring the continuous power generation of the cell.
The innovation of the embodiment of the application is that, flexible thin-film solar cell packaging structure still includes coating film layer 8, coating film layer 8 sets up the inside of front bezel 1 or set up front bezel 1 orientation one side of battery chip 2, coating film layer 8 is first refraction layer and the second refraction layer of setting up in turn, first refraction layer just of formation on the substrate the refracting index of first refraction layer material is higher than the refracting index of substrate material, the refracting index of second refraction layer material is less than the refracting index of substrate material. For example, when the substrate material is selected to be PET, the refractive index thereof is 1.5 to 1.6, and preferably, the refractive index of the first refractive layer is greater than 1.6 and the refractive index of the second refractive layer is less than 1.5.
In this embodiment, the coating layer 8 is the first refraction layer and the second refraction layer that set up in turn, has realized the alternative membrane system design of high low refractive index, realizes the color display according to the interference of light, and the coating layer 8 is the cladding material structure on panel surface, compares in the colored optical film who uses among the prior art, can not influence the lamination process flow of flexible thin-film solar cell product.
Optionally, the material of the first refraction layer includes but is not limited to TiO2、Ti3O5、Nb2O5、AlN、SiN、ZrO2、Ta2O5The material of the second refraction layer includes but is not limited to SiO2、Al2O3、MgF2. Preferably, the coating layer 8 is a silicon nitride coating and an aluminum oxide coating which are alternately arranged, and the silicon nitride coating meets the water and oxygen barrier property of the mobile energy product due to high compactness and high barrier property while the high-low refractive index alternate film system design is realized.
In some embodiments, as shown in fig. 1 and 2, the front plate 1 is an integrated structure design, and the plated layer is disposed on a side of the front plate 1 facing the battery chip 2, that is, the integrated front plate 1 is used as a substrate, and the plated layer 8 is formed on a surface of the integrated front plate 1 facing the battery chip 2 by a vacuum plating process, preferably a magnetron sputtering process. Preferably, in the above embodiment, the surface of the front plate 1 facing away from the battery chip 2 has a frosted layer, a diamond-like coating or a silicon oxide coating to achieve the anti-glare and wear-resistant characteristics of the surface. According to the flexible thin-film solar cell package provided by the embodiment, the upper surface of the front plate 1 has an anti-dazzle and wear-resistant function through surface treatment, the lower surface of the front plate 1 is provided with the coating layer 8 with the functions of color display and water and oxygen separation, the integration of the structure of the front plate 1 is realized, and the flexible thin-film solar cell package is suitable for power generation paper products. Wherein, the front plate 1 is connected with the battery chip 2 through the second adhesive film layer 5. The back plate 3 is connected with the battery chip 2 through a third adhesive film layer 6.
As shown in fig. 1 and 2, the backplane 3 includes a backplane first encapsulation layer 301 and a backplane second encapsulation layer 302, and the backplane first encapsulation layer 301 and the backplane second encapsulation layer 302 are connected by a fourth glue film layer 7. In flexible thin-film solar cell, because backplate 3 need not consider the permeability of light, generally adopt the material of low price relatively, for example can use the first encapsulating layer 301 of aluminium PET layer as the backplate, play the effect of steam separation, for traditional aluminium PET backplate, can also consider to subtract last layer PET or choose for use substrate such as fluorine-coated PET, can accord with flexible thin-film solar cell light more, thin, gentle characteristic, backplate second encapsulating layer generally is the backer, its material is the cloth, be used for being connected of flexible thin-film solar cell packaging structure and mobile energy product, it is integrative to be convenient for subassembly and mobile energy product to sew up, the material of cloth and the surface of mobile energy product are treated the material phase-match of connecting portion.
In some embodiments, as shown in fig. 3 and 4, the front board 1 may be a multi-layer laminated structure, the front board 1 includes a front board first package layer 11 and a front board second package layer 12, the coating layer 8 is disposed on one side of the front board second package layer 12, the front board first package layer 11 is connected to the front board second package layer 12 through a first adhesive film layer 4, and the front board second package layer 12 is connected to the battery chip 2 through a second adhesive film layer 5. The front plate second sealing layer 12 is a direct contact layer of the battery chip 2, and must have a function of protecting the battery chip 2 from water and oxygen erosion, and is preferably made of a PET substrate having excellent dimensional stability and low cost, and preferably subjected to a surface treatment such as a plasma surface corona treatment or a coating treatment before a coating process is performed to improve the bonding force between the vacuum coating layer and the PET substrate. The first front plate packaging layer 11 actually plays a role in diffuse reflection, the structure is arranged on the upper layer of the second front plate packaging layer 12, and meanwhile, the effects of anti-dazzle and weakening chip scribing are achieved, and the uniformity of the laminated assembly is achieved. The material of the first packaging layer 11 of front bezel can be different according to the requirement of the life of different mobile energy products that flexible thin-film solar cell encapsulation was applied to, the material of the first packaging layer 11 of front bezel includes but not limited to dull polish PET, mute light ETFE, mute light FEP and mute light FEP, if mobile energy product is electricity generation class product, the preferred material of the first packaging layer 11 of front bezel is dull polish PET, if mobile energy product is electricity generation package and umbrella class product, material ETFE can be chooseed for use to the first packaging layer 11 of front bezel, mainly consider environmental resistance, high light transmissivity and surface properties such as resistant drawing wear-resisting. Similarly, the back plate 3 includes a first back plate packaging layer 31 and a second back plate packaging layer 32, the first back plate packaging layer 31 is connected to the battery chip 2 through a third adhesive film layer 6, and the first back plate packaging layer 31 is connected to the second back plate packaging layer 32 through a fourth adhesive film layer 7.
Optionally, the film layer 8 is disposed on a side of the front plate first packaging layer 11 facing the battery chip 2; optionally, the film layer 8 is disposed on a side of the front plate first packaging layer 11 facing away from the battery chip 2.
In the above embodiment, the color saturation C of the coating layer in the reflection angle rangeab *Higher than 10, wherein the color saturation Cab *The calculation method is as follows:
a*and b*Are the CIE color coordinates under the daylight illuminant CIE-D65, which can be measured by a visible spectrophotometer. The CIE Standard illumination Lamp D65 is an industry reference standard among published ISO3668, ASTM1729 and DIN6173-2 standards for visual matching of color materials, surfaces and finishes. In addition, the CIE-D65 is also used for color standards and sample testing by the manufacturing industry, and the application range is very wide. CIE standard illuminant D65 is intended to represent average daylight conditions, with a correlated color temperature of about 6500K.
Preferably, the coating layer 8 is preferably designed in a four-layer structure from the viewpoint of low-cost production, that is, a silicon nitride coating layer, an aluminum oxide coating layer, a silicon nitride coating layer and an aluminum oxide coating layer are sequentially coated on the surface of the substrate. In the above embodiment, in order to achieve a good coating effect, the preparation process of the coating layer 8 needs to be performed in a low-temperature vacuum environment, and the temperature is preferably 50 ℃ to 60 ℃, so that a good coating effect can be obtained. Preferably, the coating layer 8 is prepared on the surface of the front plate second packaging layer 12 through a magnetron sputtering process, and the surface of the coating layer 8 is subjected to oxygen plasma treatment or coating treatment to enable the surface tension to reach 38dyn/cm, so that a hydrophilic effect is realized, and the function of enhancing the bonding strength is achieved when the assembly is laminated.
An alternative magnetron sputtering process is listed below:
step 1: after the substrate material is processed by environmental stability, the substrate material is placed into a film coating chamber until the vacuum degree reaches 10-3Starting coating work when Pa is reached;
step 2: ar 20sccm, N is introduced213sccm, bombarding the silicon target by particles through a reactive sputtering principle, and preparing a SiN coating under the condition of 300W, wherein the thickness of the coating is 10-200 nm;
alternating SiN/A implementation2O3The plating layer structure realizes different color changes, and the alternate cycle period can be 1-5 periods.
In the above embodiment, the thickness uniformity of the coating layer 8 is controlled within ± 2.5%, so as to ensure the uniformity of the optical color. The thickness of the specific film coating layer 8 can be specifically determined according to the color requirements of customers, and different colors can be displayed when the thicknesses of the film coating layers 8 are different.
In the above embodiment, the four layers of the first adhesive film layer 4, the second adhesive film layer 5, the third adhesive film layer 6 and the fourth adhesive film layer 8 are adhesive films and have an adhesive effect. The second adhesive film layer 5 and the third adhesive film layer 6 are arranged on the upper side and the lower side of the battery chip 2, and POE adhesive films are preferably adopted to avoid reaction with the battery chip; and the first adhesive film layer 4 and the fourth adhesive film layer 7 can be EVA (ethylene vinyl acetate) or POE (polyolefin elastomer) and the like, so that the one-time lamination of the thin-film solar cell mobile energy product is convenient to realize, preferably, the lamination process of the flexible thin-film solar cell packaging structure is 165 ℃, the vacuumizing time is 3-5 min, and the pressure maintaining time is 15 min.
It should be noted that the flexible thin-film solar cell package structure according to the above embodiments may further include other necessary components or structures such as electrodes, bus bars, and wires, and the corresponding arrangement positions and connection relationships may refer to the flexible thin-film solar cell in the prior art, and the connection relationships, operation, and operation principles of the structures that are not described are known to those skilled in the art, and are not described in detail herein.
Some embodiments in this specification are described in a progressive or parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a flexible thin-film solar cell packaging structure, is including front bezel (1), battery chip (2) and backplate (3) that set gradually, its characterized in that still includes the coating film layer, the coating film layer sets up the inside of front bezel (1) or set up front bezel (1) orientation one side of battery chip (2), the coating film layer is first refraction layer and the second refraction layer that sets up in turn, at first forms first refraction layer just on the substrate the refracting index of first refraction layer material is higher than the refracting index of substrate material, the refracting index of second refraction layer material is less than the refracting index of substrate material.
2. The flexible thin-film solar cell package structure of claim 1, wherein the front plate (1) is a unitary structure, and the coating layer is disposed on a side of the front plate (1) facing the cell chip (2).
3. Flexible thin-film solar cell package structure according to claim 2, characterized in that the surface of the front sheet (1) facing away from the cell chip (2) has a frosted layer, a diamond-like coating or a silicon oxide layer.
4. The flexible thin-film solar cell package structure of claim 1, wherein the front board (1) comprises a front board first package layer (11) and a front board second package layer (12), the coating layer is disposed on one side of the front board second package layer (12), the front board first package layer (11) is connected with the front board second package layer (12) through a first adhesive film layer (4), and the front board second package layer (12) is connected with the cell chip (2) through a second adhesive film layer (5).
5. The flexible thin-film solar cell package structure of claim 1, wherein the plated layer has a color saturation C within a range of reflection anglesab *Higher than 10, wherein:
a*and b*Are the CIE color coordinates under daylight illuminant CIE-D65.
6. The flexible thin-film solar cell package structure of claim 1, wherein the coating layer is a silicon nitride coating layer, an aluminum oxide coating layer, a silicon nitride coating layer and an aluminum oxide coating layer which are sequentially arranged.
7. The flexible thin film solar cell package structure of claim 1, wherein the thickness uniformity of the coating layer is ± 2.5%, the surface of the coating layer is treated by oxygen plasma, and the surface tension of the coating layer is not less than 38 dyn/cm.
8. The flexible thin-film solar cell encapsulation structure according to claim 4, wherein the front plate first encapsulation layer (11) is made of at least one material selected from the group consisting of frosted PET, matte ETFE, matte FEP and matte FEP; the front plate second packaging layer (12) is a PET base material.
9. The flexible thin-film solar cell package structure according to claim 1, wherein the back sheet (3) comprises a first back sheet package layer (31) and a second back sheet package layer (32), the first back sheet package layer (31) is connected to the cell chip (2) through a third adhesive film layer (6), and the first back sheet package layer (31) is connected to the second back sheet package layer (32) through a fourth adhesive film layer (7).
10. The flexible thin-film solar cell encapsulation structure according to claim 9, wherein the material of the third adhesive film layer (6) comprises POE; the fourth adhesive film layer (7) is made of EVA or POE; the first packaging layer (31) of the back plate is made of aluminum PET; the second packaging layer (32) of the back plate is made of cloth.
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