Flexible solar substrate structure

Abstract

The utility model provides a flexible solar substrate structure which comprises a top protection layer, a middle glass layer, a battery layer, a steel plate layer and a lower bottom layer which are sequentially arranged from top to bottom, and bonding media are arranged among the top protection layer, the middle glass layer, the battery layer, the steel plate layer and the lower bottom layer. The top protection layer, the middle glass layer, the battery layer, the steel plate layer and the lower bottom layer are bonded through the bonding medium, the upper end face of the top protection layer is coated with a protection coating, the upper end face of the middle glass layer is coated with a graphene coating, according to the scheme, the transmittance of organic materials, PET / PC / ETFE and the like adopted for bonding is generally 88%-93%, the transmittance of glass raw materials is generally 91%-94%, and the transmittance of the glass raw materials is generally 98%-93%. Through the later process treatment, the transmittance of the glass structure even can reach 97-98%, the light loss is reduced due to the high transmittance, and the conversion effect of light energy is further improved; meanwhile, compared with an organic material, the glass has higher hardness, and the overall mechanical strength can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of flexible solar substrate, in particular to a flexible solar substrate structure. BACKGROUND

[0002] Solar panels are assembled by a number of single-crystal silicon solar cell pieces in a certain way on a panel. The photoelectric conversion efficiency of single-crystal silicon solar cells is about 15%, and the highest reaches 24%, which is the highest photoelectric conversion efficiency among all kinds of solar cells. The use of solar energy for power generation has been mature in technology. However, the biggest problem of all silicon solar cells so far is that it must be processed into a hard panel-shaped battery panel. This limits its many daily uses.

[0003] The existing patent (publication number: CN110176509B) discloses a stainless steel substrate for flexible solar cell, which comprises a stainless steel foil, a Cu-based elastic adhesive layer is compounded on the center part of one side surface of the stainless steel foil, and the one side surface of the Cu-based elastic adhesive layer is elastically connected with the one side surface of the stainless steel foil in an integral forming mode. The patent solves the technical problem that the adhesion between the current stainless steel substrate for flexible solar cell and the flexible film of the solar cell is not good enough, which cannot effectively meet the use requirements. However, the patent still has the technical problems of low light transmittance and insufficient mechanical structure strength of the solar substrate. CONTENT OF THE UTILITY MODEL

[0004] One of the technical problems to be solved by the present disclosure is that the light transmittance of the flexible solar substrate structure is low, and the mechanical structure strength of the solar substrate is insufficient.

[0005] To solve the above technical problems, the present disclosure provides a flexible solar substrate structure, which comprises a top protective layer, a middle glass layer, a battery layer, a steel plate layer and a lower bottom layer. The top protective layer, the middle glass layer, the battery layer, the steel plate layer and the lower bottom layer are sequentially arranged from top to bottom. An adhesive medium is arranged between the top protective layer, the middle glass layer, the battery layer, the steel plate layer and the lower bottom layer. The adhesive medium adhesively connects the top protective layer, the middle glass layer, the battery layer, the steel plate layer and the lower bottom layer. The upper end surface of the top protective layer is coated with a protective coating, and the upper end surface of the middle glass layer is coated with a graphene coating.

[0006] In some embodiments, the top protective layer is cellulose propionate.

[0007] In some embodiments, the thickness of the top protective layer is 50um-250um.

[0008] In some embodiments, the middle glass layer adopts ultra-thin glass, and the thickness of the middle glass layer is 0.03mm-0.125mm.

[0009] In some embodiments, the battery layer is any one or a combination of the above of a base thin film solar cell and / or a copper indium gallium selenide thin film solar cell (CIGS) and / or a cadmium telluride thin film solar cell (CdTe).

[0010] In some embodiments, the thickness of the battery layer is 2um-75um.

[0011] In some embodiments, the steel plate layer is an ultra-thin steel plate, and the thickness of the steel plate layer is 0.0153mm-0.33mm.

[0012] In some embodiments, the lower bottom layer is a PET type medium, and the thickness of the lower bottom layer is 50um-250um.

[0013] In some embodiments, the adhesive medium is an OCF medium.

[0014] In some embodiments, the thickness of the adhesive medium is 25um-125um.

[0015] Through the above technical solution, the flexible solar substrate structure provided by the present disclosure has the following beneficial effects:

[0016] Firstly, the present solution is sequentially provided from top to bottom with a top protective layer, a middle glass layer, a battery layer, a steel plate layer and a lower bottom layer, and an adhesive medium is arranged between each layer to bond each coating layer, the top protective layer is made of cellulose propionate (CP), the lower bottom layer is made of a PET type medium, and the transmittance of the PET / PC / ETFE organic material used for bonding is generally 88%-93%, while the transmittance of the glass raw material is generally 91%-94%, and the transmittance of the glass structure can even reach 97-98% through later process treatment, so that the higher transmittance reduces the loss of light and further improves the light energy conversion effect; at the same time, compared with the organic material, the glass has higher hardness, which can improve the overall mechanical strength.

[0017] Secondly, the middle glass layer in the scheme introduces ultra-thin glass (UTG): a high-aluminum glass with a thickness of 0.03mm-0.125mm, the minimum bending radius of which has reached 1mm, the bending life of which is more than 200,000 times, the transmittance of the base material of which is more than 93% (visible light), and the surface hardness of which can reach more than 7H. As the surface layer of the thin-film battery, the UTG can not only have a higher transmittance, but also increase the partial rigidity of the structure. The steel plate layer uses ultra-thin steel (hand-tearable steel): as a new favorite of foldable display screens, the ultra-thin steel plate has a conventional thickness of 0.01mm-0.33mm, has an excellent flexibility on the surface, and is hand-tearable, which is conducive to the processability thereof. The application of the ultra-thin steel in the flexible solar panel is conducive to the strength of the overall structure. A graphene coating is coated on the upper end surface of the middle glass layer. The application of graphene: with the characteristics of high strength, high transmittance, high thermal conductivity, ultra-thinness, and ultra-lightness, the graphene can be used as a protective layer on the surface of the UTG to significantly increase the overall performance. Cellulose propionate (CP): is a cellulose ester polymer in which the hydroxyl group in the cellulose molecule is esterified with propionic acid. With the characteristics of transparency, high gloss, high toughness, rigidity, weather resistance, and low-temperature resistance, the CP has a high application range as the outer layer structure of the mechanism.

[0018] Thirdly, the adhesive medium in the scheme uses OCF medium. As a new type of medium, the OCF has excellent optical performance and easy processability. Compared with the traditional double-sided adhesive bonding method with an air layer, the OCF technology fills a non-adhesive transparent medium to realize the seamless bonding between the display screen and the touch screen, reduces the diffuse reflection, and improves the display effect. In addition, since the medium has no adhesion, the assembly and maintenance become very simple.

[0019] Fourthly, a protective coating is coated on the upper end surface of the top protective layer. The protective coating uses a composite polyurethane nano coating. Due to the small size effect, surface effect, quantum size effect, and macroscopic quantum tunnel effect of the nano particles, the nano particles have characteristics that conventional materials do not have in terms of magnetism, light, electricity, and sensitivity. As the outermost surface of the overall structure, the protective coating can not only improve the strength of the overall mechanism, but also has high transmittance, anti-fouling, and self-cleaning capabilities. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0021] Figure 1 is a schematic diagram of the flexible solar panel structure disclosed in the embodiments of the present disclosure.

[0022] Reference numerals:

[0023] 1. top protective layer; 2. middle glass layer; 3. battery layer; 4. steel plate layer; 5. lower bottom layer; 6. adhesive medium; 7. protective coating layer. DETAILED DESCRIPTION

[0024] The embodiments of the present disclosure will be described in further detail below with reference to the drawings and examples. The following detailed description of the examples and the accompanying drawings are provided to illustrate the principles of the present disclosure, and should not be taken in a limiting sense. The present disclosure can be implemented in numerous ways, including, but not limited to, the specific embodiments described in this disclosure. Rather, any number of variations and modifications can be made to the described embodiments without departing from the scope of the present disclosure.

[0025] The present disclosure provides these examples in order to more fully describe the present disclosure and to convey the scope of the present disclosure to those skilled in the art. It should be noted that the relative arrangement of the components and steps, the numerical expressions, and the numerical values set forth in these examples are not to be construed as limiting, unless otherwise specifically stated. Unless otherwise specifically stated, the terms "a" and "an" and "the" and similar terms accompanying a singular noun or pronoun include plural referents unless the context clearly indicates otherwise.

[0026] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] In addition, the "first", "second", and similar words used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0028] It should be noted that in the description of the present disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between the first device and the second device, there can be or can not be an intermediate device between the specific device and the first device or the second device.

[0029] All the terms used in the present disclosure have the same meaning as understood by those skilled in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or excessively formalized sense, unless otherwise defined explicitly herein.

[0030] The techniques, methods, and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods, and devices should be considered as part of the specification.

[0031] As shown in Figure 1 The flexible solar substrate structure is provided with, from top to bottom, a top protective layer 1, a middle glass layer 2, a cell layer 3, a steel plate layer 4, and a lower bottom layer 5. An adhesive medium 6 is provided between each layer to bond the coatings and form a stable structure between the layers.

[0032] Among them,

[0033] The top protective layer 1 is cellulose propionate CP, which is a cellulose ester polymer in which the hydroxyl group in the cellulose molecule is esterified with propionic acid. It has the characteristics of transparency, high gloss, high toughness, rigidity, weather resistance, and low temperature resistance. As the outer structure of the flexible solar substrate structure, it has good protection and high transparency. The thickness of the top protective layer 1 is 50um-250um.

[0034] The middle glass layer 2 is ultra-thin glass (UTG): high-aluminum glass. The thickness of the middle glass layer 2 is 0.03mm-0.125mm. Its minimum bending radius is 1mm, and the bending life is more than 200,000 times. The transmittance of its substrate is more than 93% for visible light, and the surface hardness is more than 7H. As the UTG of the thin film battery surface layer, it not only has high transmittance, but also increases the partial rigidity of the structure.

[0035] Battery layer 3: thin film battery, a layer of thin film is prepared into a solar cell, which uses very little silicon, which is easier to reduce the cost, thin film battery can adopt any one or more combinations of base thin film solar cell and / or copper indium gallium selenium thin film solar cell CIGS and / or cadmium telluride thin film solar cell CdTe, thin film battery forms a thin film thickness of only a few microns to generate voltage, and the highest conversion efficiency can reach 13%, the thickness of battery layer 3 is 2um-75um, the thinnest is microcrystalline silicon solar thin plate, the thickness is only 2um-5um;

[0036] Steel sheet layer 4: super-thin steel sheet hand tearing steel, steel carrier structure, the thickness of steel sheet layer 4 is 0.0153mm-0.33mm; the surface has excellent flexibility, which is beneficial to its machinability, and its application in flexible solar panel is beneficial to the strength of the overall structure;

[0037] Lower bottom layer 5: PET medium can be selected, the thickness of lower bottom layer 5 is generally 50um-250um;

[0038] In some embodiments, the adhesive medium 6 in the scheme adopts OCF medium, OCF as a new type of medium has excellent optical performance and easy processing, compared with the traditional double-sided adhesive bonding method containing air layer, OCF technology realizes seamless bonding between display screen and touch screen by filling non-adhesive transparent medium, reduces diffuse reflection and improves display effect; in addition, since the medium has no adhesion, assembly and maintenance become very simple, the thickness of OCF medium is 25um-125um;

[0039] In some embodiments, a protective coating 7 is coated on the upper end surface of the top protective layer 1, the protective coating 7 adopts composite polyurethane nano coating, due to the small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of nano particles, it has characteristics that conventional materials do not have in terms of magnetism, light, electricity, sensitivity and the like, as the outermost surface of the flexible solar substrate structure, the thickness of the composite polyurethane nano coating is 50nm-800nm, which not only improves the strength of the overall mechanism, but also has high permeability, and has the ability of anti-fouling and self-cleaning.

[0040] In some embodiments, a graphene coating is coated on the upper end surface of the middle glass layer 2, the thickness is molecular level, which can be generally ignored; its high strength, high permeability, high thermal conductivity, ultra-thin and ultra-light characteristics, as the protective layer of UTG surface, can significantly increase the overall performance.

[0041] In some embodiments, the outer side of the lower bottom layer 5 is coated with a nano coating and / or OCF medium, so as to further increase the structural strength of the lower bottom layer 5

[0042] In combination with the above-mentioned interlayer structure and coating, the thickness of the flexible solar substrate structure can be controlled within 250-300 um, the maximum photoelectric conversion rate is about 12-13%, the minimum bending radius is 3-4 mm, and the bending life of the flexible solar panel is greater than 200,000 times, thereby improving the structural strength and adaptability of the solar substrate.

[0043] Thus far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0044] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner.

Claims

1. A flexible solar substrate structure, characterized by, The application relates to a solar cell, which comprises a top protective layer (1), a middle glass layer (2), a battery layer (3), a steel plate layer (4) and a lower bottom layer (5), wherein the top protective layer (1), the middle glass layer (2), the battery layer (3), the steel plate layer (4) and the lower bottom layer (5) are sequentially arranged from top to bottom, an adhesive medium (6) is arranged between the top protective layer (1), the middle glass layer (2), the battery layer (3), the steel plate layer (4) and the lower bottom layer (5), the adhesive medium (6) is used for mutually bonding the top protective layer (1), the middle glass layer (2), the battery layer (3), the steel plate layer (4) and the lower bottom layer (5), the upper end surface of the top protective layer (1) is coated with a protective coating (7), and the upper end surface of the middle glass layer (2) is coated with a graphene coating. The top protective layer (1) is cellulose propionate. The middle glass layer (2) is ultra-thin glass, and the thickness of the middle glass layer (2) is 0.03mm-0.125mm. The steel plate layer (4) is ultra-thin steel plate, and the thickness of the steel plate layer (4) is 0.0153mm-0.33mm. The lower bottom layer (5) is a PET medium, and the thickness of the lower bottom layer (5) is 50um-250um.

2. The flexible solar substrate structure of claim 1, wherein, The thickness of the top protective layer (1) is 50um-250um.

3. The flexible solar substrate structure of claim 1, wherein, The battery layer (3) is any one or a combination of the following: a base thin film solar cell, a copper indium gallium selenium thin film solar cell CIGS and a cadmium telluride thin film solar cell CdTe.

4. The flexible solar substrate structure of claim 1, wherein, The thickness of the battery layer (3) is 2um-75um.

5. The flexible solar substrate structure of claim 1, wherein, The adhesive medium (6) is OCF medium.

6. The flexible solar substrate structure of claim 1, wherein, The thickness of the adhesive medium (6) is 25um-125um.

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