Composite adhesive film, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a composite adhesive film, a photovoltaic assembly and a photovoltaic power generation system. The composite adhesive film comprises an adhesive film body and a graphene layer, the graphene layer is arranged on at least one side of the adhesive film body in the thickness direction, and the graphene layer is suitable for being connected with a photovoltaic cell of a photovoltaic module. According to the composite adhesive film and the graphene layer, heat on the photovoltaic cell can be guided out, heat transmission is accelerated, and the power of the photovoltaic module is improved, so that the generating capacity of the photovoltaic module is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially is related to a kind of composite adhesive film, photovoltaic module and photovoltaic power generation system. BACKGROUND

[0002] Photovoltaic is the abbreviation of solar photovoltaic power generation system, it is a kind of photovoltaic effect of using photovoltaic cell semiconductor material, and solar radiation energy is directly converted into a new type of power generation system, and there are two ways of independent operation and parallel operation.

[0003] However, in the process of using photovoltaic cell, the power of photovoltaic cell will decrease with the temperature of photovoltaic cell increasing, so that the power generation of photovoltaic cell decreases with the temperature increasing. That is to say, the photovoltaic cell of conventional technology has the technical defect of low power generation under high temperature. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in prior art. To this end, one purpose of the utility model is to provide a kind of composite adhesive film, graphene layer is conducive to the heat export on photovoltaic cell, accelerates heat transport, improves the power of photovoltaic module, so as to improve the power generation of photovoltaic module.

[0005] Another purpose of the utility model is to provide a kind of photovoltaic module using the above-mentioned composite adhesive film.

[0006] Still another purpose of the utility model is to provide a kind of photovoltaic power generation system using the above-mentioned composite adhesive film or photovoltaic module.

[0007] According to the composite adhesive film of the first aspect embodiment of the utility model, the graphene layer is set on at least one side of the thickness direction of the adhesive film body, and the graphene layer is suitable for being connected with the photovoltaic cell of photovoltaic module.

[0008] According to the composite adhesive film of the utility model, by setting graphene layer, graphene layer has excellent heat conduction performance, can transfer the heat on photovoltaic cell inside photovoltaic module to outside, to achieve the effect of cooling the inside of photovoltaic module, so as to effectively solve the problem of lack of directional heat conduction of radiative refrigeration material in conventional technology, reduce the temperature of photovoltaic cell, and then improve the power of photovoltaic cell, improve the power generation of photovoltaic cell.

[0009] According to some embodiments of the utility model, the graphene layer includes: a first graphene layer, the first graphene layer includes graphene nanosheet layer or graphene hollow nanosphere layer.

[0010] According to some embodiments of the present application, the graphene layer further comprises: a second graphene layer, the second graphene layer is arranged between the first graphene layer and the adhesive film body, and the second graphene layer comprises the graphene nanosheet layer or the graphene hollow nanosphere layer.

[0011] According to some embodiments of the present application, the thickness of the first graphene layer is h1, wherein the h1 satisfies: 5 μm≤h1≤10 μm; and / or the thickness of the second graphene layer is h2, wherein the h2 satisfies: 5 μm≤h2≤10 μm.

[0012] According to some embodiments of the present application, the graphene hollow nanosphere layer comprises a plurality of graphene hollow nanospheres, the pore diameter of the graphene hollow nanospheres is D1, and the diameter of the graphene hollow nanospheres is D2, wherein the D1 and D2 respectively satisfy: 3 nm≤D1≤20 nm and 30 nm≤D2≤500 nm.

[0013] According to some embodiments of the present application, the graphene layer is a plurality of graphene layers, the plurality of graphene layers are arranged on both sides of the thickness direction of the adhesive film body, and the graphene layer comprises: a first graphene layer and a second graphene layer, the second graphene layer is arranged between the first graphene layer and the adhesive film body, the second graphene layer is a graphene hollow nanosphere layer, and the first graphene layer is a graphene nanosheet layer.

[0014] According to some embodiments of the present application, the thickness of the adhesive film body is h3, wherein the h3 satisfies: 0.5 mm≤h3≤1 mm.

[0015] According to some embodiments of the present application, the adhesive film body comprises an EVA adhesive film, a POE adhesive film, an EPE adhesive film or a TPO adhesive film.

[0016] According to the photovoltaic module of the second aspect of the present application, the composite adhesive film is the composite adhesive film according to the first aspect of the present application.

[0017] According to some embodiments of the present application, the composite adhesive film is a plurality of composite adhesive films, and the photovoltaic module comprises: a photovoltaic cell; a front cover plate and a back cover plate, the front cover plate and the back cover plate are arranged on both sides of the thickness direction of the photovoltaic cell, respectively, and a plurality of composite adhesive films are arranged between the front cover plate and the photovoltaic cell and between the back cover plate and the photovoltaic cell, respectively.

[0018] According to some embodiments of the present application, the front cover plate and the back cover plate respectively comprise: a photovoltaic glass; a reflection layer, the reflection layer is arranged on the side of the photovoltaic glass close to the photovoltaic cell, and the reflection layer is adapted to reflect ultraviolet light and / or infrared light in sunlight.

[0019] The photovoltaic power generation system according to the third aspect of the present application comprises the composite adhesive film according to the first aspect of the present application or the photovoltaic module according to the second aspect of the present application.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a schematic view of a composite adhesive film according to an embodiment of the present application;

[0023] Figure 2 is a schematic view of a photovoltaic module according to an embodiment of the present application;

[0024] Figure 3 is a schematic view of a front cover plate of a photovoltaic module according to an embodiment of the present application;

[0025] Figure 4 is a schematic view of a reflective layer of a photovoltaic module according to an embodiment of the present application.

[0026] REFERENCE NUMERALS:

[0027] 100, composite adhesive film;

[0028] 1, adhesive film body;

[0029] 2, graphene layer; 21, first graphene layer; 211, graphene nanosheet layer;

[0030] 22, second graphene layer; 221, graphene hollow nanosphere layer;

[0031] 200, photovoltaic module;

[0032] 201, photovoltaic cell; 202, front cover plate; 203, back cover plate;

[0033] 204, photovoltaic glass; 205, reflective layer;

[0034] 2051, silicon dioxide layer; 2052, hafnium dioxide layer; 2053, silver layer; 2054, titanium layer. DETAILED DESCRIPTION

[0035] Embodiments of the present application will be described in detail below with reference to the drawings, the embodiments described with reference to the drawings are exemplary, and the following description is made with reference toFigure 1 The composite film 100 according to a first aspect embodiment of the present invention is described. The composite film 100 can be used in a photovoltaic module 200, and in the following description of this application, the composite film 100 is described as being used in a photovoltaic module 200 as an example.

[0036] like Figure 1 As shown, the composite adhesive film 100 according to the first aspect embodiment of the present invention includes an adhesive film body 1 and a graphene layer 2.

[0037] Specifically, the graphene layer 2 is disposed in the thickness direction of the film body 1 (e.g., Figure 1 The graphene layer 2 is located on at least one side (up or down direction) of the photovoltaic module 200, and is adapted to be connected to the photovoltaic cell 201 of the photovoltaic module 200. For example, when the graphene layer 2 is disposed on one side of the thickness direction of the adhesive film body 1, the graphene layer 2 is located on the upper or lower side of the adhesive film body 1. Of course, graphene layers 2 can also be disposed on both sides of the thickness direction of the adhesive film body 1. Figure 1 and Figure 2 In the example, the side of the graphene layer 2 away from the film body 1 is connected to the photovoltaic cell 201 of the photovoltaic module 200.

[0038] In this configuration, the graphene layer 2 possesses excellent thermal conductivity. After being combined with the adhesive film 1, the side containing the graphene layer 2 contacts the photovoltaic cell 201, thus serving as the adhesive for the composite adhesive film 100. When the photovoltaic module 200 is exposed to sunlight for extended periods, it generates heat. This heat can be directionally transferred from the photovoltaic cell 201 to the outside via the graphene layer 2, effectively cooling the interior of the photovoltaic module 200. This effectively solves the problem of lack of directional heat conduction in traditional radiative cooling materials, preventing excessive internal heat radiation and heat accumulation in the photovoltaic cell 201. This lowers the internal temperature of the photovoltaic cell 201, thereby increasing its power output and electricity generation. Furthermore, the adhesive film 1 enhances the stability of the connection between the adhesive film 1 and the graphene layer 2, thus improving the stability of the composite adhesive film 100 and the photovoltaic module 200.

[0039] According to the composite film 100 of this utility model, by setting a graphene layer 2, the graphene layer 2 has excellent thermal conductivity, which can transfer the heat on the photovoltaic cell 201 inside the photovoltaic module 200 to the outside, thereby achieving the effect of cooling the inside of the photovoltaic module 200. This effectively solves the problem of lack of directional heat conduction in the radiation cooling material in the traditional technology, reduces the temperature of the photovoltaic cell 201, and thus increases the power of the photovoltaic cell 201 and the power generation of the photovoltaic cell 201.

[0040] According to some embodiments of this utility model, refer toFigure 1 The graphene layer 2 includes a first graphene layer 21, and the first graphene layer 21 includes graphene nanosheet layers 211 or graphene hollow nanosphere layers 221. That is, the first graphene layer 21 can be arranged on one side of the adhesive film body 1, and the graphene layer 2 is a single-layer structure.

[0041] For example, when the first graphene layer 21 includes the graphene nanosheet layers 211, the graphene nanosheet layers 211 have excellent heat conduction performance, and the graphene nanosheet layers 211 are in contact with the photovoltaic cell 201, so that heat can be transferred from the inside to the outside in a directional manner. That is, the graphene nanosheet layers 211 can transfer the heat on the photovoltaic cell 201 to the outside of the photovoltaic cell 201, so that the inside of the photovoltaic cell 201 is cooled, the temperature of the photovoltaic cell 201 is reduced, the power of the photovoltaic cell 201 is improved, and the power generation of the photovoltaic cell 201 is improved. The graphene nanosheet layers 211 are provided with a plurality of channels to facilitate the directional dissipation of heat.

[0042] When the first graphene layer 21 includes the graphene hollow nanosphere layers 221, the graphene hollow nanosphere layers 221 have the characteristics of high refractive index and wide band gap, can obtain very high emissivity in the mid-infrared and far-infrared wave bands, and the hollow structure in the graphene hollow nanosphere layers 221 can multiple reflect and scatter the incident sunlight (such as infrared light and ultraviolet light), so as to weaken the absorption of solar radiation and improve the refrigeration effect, thereby reducing the temperature of the photovoltaic cell 201 and improving the power generation of the photovoltaic module 200. It should be noted that the graphene nanosheet layers 211 and the graphene hollow nanosphere layers 221 are graphite (2000 W / (m·K)) materials prepared into a graphite matrix with high orientation.

[0043] According to some embodiments of the present application, referring to Figure 1 The graphene layer 2 further includes a second graphene layer 22, the second graphene layer 22 is arranged between the first graphene layer 21 and the adhesive film body 1, and the second graphene layer 22 includes graphene nanosheet layers 211 or graphene hollow nanosphere layers 221. That is, the graphene layer 2 can be arranged on one side of the adhesive film body 1, the graphene layer 2 includes the first graphene layer 21 and the second graphene layer 22, and the graphene layer 2 is a double-layer structure.

[0044] For example, the second graphene layer 22 and the first graphene layer 21 can be arranged in the following ways: first, the second graphene layer 22 includes the graphene nanosheet layers 211, and the first graphene layer 21 includes the graphene hollow nanosphere layers 221. Second, the second graphene layer 22 includes the graphene hollow nanosphere layers 221, and the first graphene layer 21 includes the graphene nanosheet layers 211 (which is a preferred scheme).

[0045] When the second graphene layer 22 comprises the graphene nanosheet layer 211, the graphene nanosheet layer 211 has excellent heat conduction performance, the graphene nanosheet layer 211 is in contact with the photovoltaic cell 201, heat can be transferred from the inside to the outside, that is, the graphene nanosheet layer 211 can transfer the heat on the photovoltaic cell 201 to the outside of the photovoltaic cell 201, so that the inside of the photovoltaic cell 201 is cooled, thereby reducing the temperature of the photovoltaic cell 201, improving the power of the photovoltaic cell 201, and further improving the power generation of the photovoltaic cell 201.

[0046] When the second graphene layer 22 comprises the graphene hollow nanosphere layer 221, the graphene hollow nanosphere layer 221 has the characteristics of high refractive index and wide band gap, and can obtain very high emissivity in the mid-infrared and far-infrared bands, and the hollow structure in the graphene hollow nanosphere layer 221 can multiple reflect and scatter the incident sunlight, thereby weakening the absorption of solar radiation and improving the refrigeration effect, thereby reducing the temperature of the photovoltaic cell 201 and improving the power generation of the photovoltaic assembly 200. Therefore, by arranging the second graphene layer 22 and the first graphene layer 21 on the adhesive film body 1, under the joint action of the second graphene layer 22 and the first graphene layer 21, the composite adhesive film 100 can not only reflect the light that is not absorbed by the photovoltaic cell 201 to the air, but also can direct the heat generated by the light that can be absorbed by the photovoltaic cell 201 from the inside to the outside, thereby further improving the cooling effect of the photovoltaic cell 201 and further improving the power generation of the photovoltaic assembly 200.

[0047] According to some embodiments of the present application, referring to Figure 1 The thickness of the first graphene layer 21 is h1, wherein h1 satisfies: 5 μm≤h1≤10 μm.

[0048] For example, when the thickness of the first graphene layer 21 is less than 5 μm, the thickness of the first graphene layer 21 is reduced, the sunlight is easy to pass through the first graphene layer 21, the reflection effect of the first graphene layer 21 on the light is weakened, or the rate of heat generated by the first graphene layer 21 is slowed down, thereby weakening the cooling effect of the composite adhesive film 100 on the photovoltaic assembly 200, slowing down the heat dissipation rate of the photovoltaic assembly 200, and further reducing the power generation of the photovoltaic assembly 200. When the thickness of the first graphene layer 21 is greater than 10 μm, the thickness of the first graphene layer 21 is large, the occupied space of the first graphene layer 21 is increased, the thickness of the composite adhesive film 100 is increased, and the overall size of the photovoltaic assembly 200 is increased. In addition, the amount of material of the first graphene layer 21 is also increased, the production cost of the first graphene layer 21 is increased, and the production cost of the composite adhesive film 100 is increased.

[0049] Therefore, by setting the thickness h1 of the first graphene layer 21 to satisfy 5μm≤h1≤10μm, the thickness of the first graphene layer 21 is reasonably set, enhancing its light reflection effect or increasing the rate at which it conducts heat generated by light. This improves the cooling effect of the composite film 100 on the photovoltaic module 200, accelerates the heat dissipation rate of the photovoltaic module 200, and thus increases the power generation of the photovoltaic module 200. Furthermore, it reduces the space occupied by the first graphene layer 21 and the thickness of the composite film 100, which is beneficial for the use of the composite film 100. In addition, it also reduces the production cost of the first graphene layer 21 and lowers the production cost of the composite film 100.

[0050] According to some other embodiments of the present invention, refer to Figure 1 The thickness of the second graphene layer 22 is h2, where h2 satisfies: 5μm≤h2≤10μm.

[0051] For example, when the thickness of the second graphene layer 22 is less than 5 μm, the reduced thickness weakens its light reflection effect or slows down the rate at which it conducts heat generated by light. This weakens the cooling effect of the composite film 100 on the photovoltaic module 200, slows down the heat dissipation rate of the photovoltaic module 200, and consequently reduces the power generation of the photovoltaic module 200. When the thickness of the second graphene layer 22 is greater than 10 μm, its larger thickness increases the space occupied by the second graphene layer 22 and the thickness of the composite film 100, thus increasing the overall size of the photovoltaic module 200. Furthermore, it increases the amount of material used in the second graphene layer 22, increasing its production cost and the production cost of the composite film 100.

[0052] Therefore, by setting the thickness h2 of the second graphene layer 22 to satisfy 5μm≤h2≤10μm, the thickness of the second graphene layer 22 is reasonably set, enhancing its light reflection effect or increasing the rate at which it conducts heat generated by light. This improves the cooling effect of the composite film 100 on the photovoltaic module 200, accelerates the heat dissipation rate of the photovoltaic module 200, and thus increases the power generation of the photovoltaic module 200. Furthermore, it reduces the space occupied by the second graphene layer 22 and the thickness of the composite film 100, which is beneficial for the use of the composite film 100. In addition, it also reduces the production cost of the second graphene layer 22 and lowers the production cost of the composite film 100.

[0053] According to some other embodiments of the present invention, referring to Figure 1The thickness of the first graphene layer 21 is h1, and the thickness of the second graphene layer 22 is h2, wherein h1 and h2 satisfy: 5 μm≤h1≤10 μm, and 5 μm≤h2≤10 μm.

[0054] Therefore, the thicknesses of the first graphene layer 21 and the second graphene layer 22 are reasonable, the reflection of the first graphene layer 21 and the second graphene layer 22 to light is enhanced, or the rate of heat generated by the first graphene layer 21 and the second graphene layer 22 to light is improved, thereby improving the cooling effect of the composite adhesive film 100 on the photovoltaic module 200, accelerating the heat dissipation rate of the photovoltaic module 200, and further increasing the power generation of the photovoltaic module 200. In addition, the occupied space of the graphene layer 2 is reduced, the thickness of the composite adhesive film 100 is reduced, and the use of the composite adhesive film 100 is facilitated. In addition, the production cost of the graphene layer 2 is also reduced, and the production cost of the composite adhesive film 100 is reduced.

[0055] Further, the graphene hollow nanosphere layer 221 includes a plurality of graphene hollow nanospheres (not shown in the figure), the pore diameter of the graphene hollow nanosphere is D1, and the diameter of the graphene hollow nanosphere is D2, wherein D1 and D2 respectively satisfy: 3 nm≤D1≤20 nm, and 30 nm≤D2≤500 nm. For example, the plurality of graphene hollow nanospheres are stacked in the length direction, the width direction and the thickness direction of the graphene hollow nanosphere layer 221 to form the graphene hollow nanosphere layer 221. The above-mentioned pore diameter refers to the pore diameter of the hole of the graphene hollow nanosphere with a hollow structure inside. The diameter refers to the outer diameter of the graphene hollow nanosphere.

[0056] When the pore diameter of the graphene hollow nanosphere is less than 3 nm, the pore diameter of the graphene hollow nanosphere layer 221 is small, the ability of the graphene hollow nanosphere to reflect and scatter light is reduced, and the cooling effect of the graphene hollow nanosphere layer 221 is weakened. When the pore diameter of the graphene hollow nanosphere is greater than 20 nm, the ability of the graphene hollow nanosphere to reflect and scatter light is also reduced, and the cooling effect of the graphene hollow nanosphere layer 221 is weakened.

[0057] When the diameter of the graphene hollow nanosphere is less than 30 nm, the processing precision requirement of the graphene hollow nanosphere is increased, and the ability of the graphene hollow nanosphere to reflect and scatter light is also reduced.

[0058] Therefore, by setting the pore diameter D1 of the graphene hollow nanosphere and the diameter D2 of the graphene hollow nanosphere to satisfy: 3 nm≤D1≤20 nm, and 30 nm≤D2≤500 nm, the pore diameter of the graphene hollow nanosphere and the diameter of the graphene hollow nanosphere are reasonable, the ability of the graphene hollow nanosphere to reflect and scatter sunlight is improved, and the cooling effect of the graphene hollow nanosphere layer 221 is improved.

[0059] According to some embodiments of the present application, referring to Figure 1 , the graphene layer 2 is multiple, the multiple graphene layers 2 are respectively arranged on both sides of the thickness direction of the adhesive film body 1, the graphene layer 2 comprises a first graphene layer 21 and a second graphene layer 22, the second graphene layer 22 is arranged between the first graphene layer 21 and the adhesive film body 1, the second graphene layer 22 is a graphene hollow nanosphere layer 221, and the first graphene layer 21 is a graphene nanosheet layer 211. In the description of the present application, the meaning of "multiple" is two or more than two.

[0060] For example, in the example of Figure 1 , the graphene layer 2 is provided with two, and the two graphene layers 2 are respectively arranged on the upper side and the lower side of the adhesive film body 1. By arranging in this way, the reflectivity of the composite adhesive film 100 is improved, the input of heat is blocked, and the heat of the photovoltaic cell 201 is also emitted to the outside in the form of infrared thermal radiation through the composite adhesive film 100, so as to realize the refrigeration effect below the ambient temperature, thereby further improving the refrigeration effect of the composite adhesive film 100, so that the inside of the photovoltaic module 200 can achieve the ideal cooling effect, and the temperature of the photovoltaic module 200 is further reduced, and the power generation capacity of the photovoltaic module 200 is further improved. Among them, the second graphene layer 22 is arranged on the adhesive film body 1 by coating, infiltration, chemical vapor deposition (CVD) and the like.

[0061] According to some embodiments of the present application, referring to Figure 1 , the thickness of the adhesive film body 1 is h3, wherein h3 satisfies: 0.5mm≤h3≤1mm. For example, when the thickness of the adhesive film body 1 is less than 0.5mm, the thickness of the adhesive film body 1 is small, the adhesive effect of the adhesive film body 1 is reduced, and the use stability of the composite adhesive film 100 is reduced. When the thickness of the adhesive film body 1 is greater than 1mm, the thickness of the adhesive film body 1 is large, the occupied space of the adhesive film body 1 is increased, and the occupied space of the composite adhesive film 100 is increased. In addition, the material consumption of the adhesive film body 1 is also increased, thereby increasing the production cost of the adhesive film body 1 and the production cost of the composite adhesive film 100.

[0062] Therefore, by setting the thickness h3 of the adhesive film body 1 to satisfy: 0.5mm≤h3≤1mm, the thickness of the adhesive film body 1 is reasonable, the adhesive effect of the adhesive film body 1 is improved, and the use stability of the composite adhesive film 100 is improved. In addition, the occupied space of the adhesive film body 1 is also reduced, and the occupied space of the composite adhesive film 100 is reduced. In addition, the material consumption of the adhesive film body 1 is reduced, thereby reducing the production cost of the adhesive film body 1 and the production cost of the composite adhesive film 100.

[0063] According to some embodiments of the present application, the adhesive film body 1 comprises an EVA adhesive film, a POE adhesive film, an EPE adhesive film or a TPO adhesive film. Thus, the applicability of the adhesive film body 1 is improved. For example, EVA is an ethylene-vinyl acetate copolymer, which is a thermoplastic material. The EVA adhesive film has excellent insulation performance, weather resistance, adhesion, ultraviolet resistance and anti-aging performance, so that the adhesive film body 1 can firmly bond multiple graphene layers 2 together, allowing the composite adhesive film 100 to be used stably for a long time. In addition, the durability of the composite adhesive film 100 for outdoor use is also improved, thereby prolonging the use stability of the composite adhesive film 100. POE is a polyolefin elastomer, and the POE adhesive film has excellent toughness, good processability and aging resistance, so that the adhesive film body 1 is easy to process, and the service life of the adhesive film body 1 is also prolonged. EPE is expandable polyethylene, and the EPE adhesive film has good insulation performance, impact resistance, temperature resistance and other characteristics, thereby reducing the influence of high temperature on the adhesive film body 1 and improving the use performance of the adhesive film body 1. TPO is a thermoplastic polyolefin, and the TPO adhesive film has the characteristics of ultraviolet resistance, good wear resistance and simple processing technology, thereby improving the durability of the adhesive film body 1 under sunlight irradiation, prolonging the service life of the adhesive film body 1, and also improving the production efficiency of the adhesive film body 1. It should be noted that the adhesive film body 1 comprises one or more of the EVA adhesive film, the POE adhesive film, the EPE adhesive film and the TPO adhesive film, and the adhesive film body 1 can be specifically set according to actual use to meet actual needs.

[0064] According to the photovoltaic module 200 of the second aspect of the present application, referring to Figure 2 , the composite adhesive film 100 according to the first aspect of the present application is included.

[0065] According to the photovoltaic module 200 of the present application, by adopting the composite adhesive film 100, the cooling effect of the photovoltaic module 200 is improved, thereby improving the power generation capacity of the photovoltaic module 200 and prolonging the service life of the photovoltaic module 200.

[0066] According to some embodiments of the present application, referring to Figure 2 , the composite adhesive film 100 is multiple, the photovoltaic module 200 comprises a photovoltaic cell 201, a front cover plate 202 and a back cover plate 203, the front cover plate 202 and the back cover plate 203 are respectively arranged on both sides of the thickness direction of the photovoltaic cell 201, and the multiple composite adhesive films 100 are respectively arranged between the front cover plate 202 and the photovoltaic cell 201 and between the back cover plate 203 and the photovoltaic cell 201.

[0067] For example, in Figure 2In the example, two composite films 100 are provided, located on the top and bottom sides of the photovoltaic cell 201, respectively. A front cover plate 202 is located on the side of one composite film 100 furthest from the photovoltaic cell 201, and a back cover plate 203 is located on the side of the other composite film 100 furthest from the photovoltaic cell 201. That is, from top to bottom, the photovoltaic module 200 consists of the front cover plate 202, the aforementioned composite film 100, the photovoltaic cell 201, the aforementioned other composite film 100, and the back cover plate 203. This arrangement protects the internal structure of the photovoltaic module 200 (e.g., the composite films 100 and the photovoltaic cell 201) from damage caused by external environmental factors, allowing the photovoltaic module 200 to operate normally for an extended period. Furthermore, the composite films 100 on both sides of the photovoltaic cell 201 can quickly dissipate heat from the photovoltaic cell 201 from different directions, improving cooling efficiency and rapidly increasing the power generation efficiency of the photovoltaic module 200.

[0068] According to some embodiments of this utility model, refer to Figure 3 The front cover plate 202 and the back cover plate 203 respectively include photovoltaic glass 204 and reflective layer 205. The reflective layer 205 is disposed on the side of photovoltaic glass 204 near photovoltaic cell 201. The reflective layer 205 is suitable for reflecting ultraviolet light and / or infrared light in sunlight.

[0069] For example, the reflective layer 205 in the front cover 202 is located on the underside of the photovoltaic glass 204 (e.g., Figure 3 As shown, the reflective layer 205 in the back cover 203 is located on the upper side of the photovoltaic glass 204. The reflective layer 205 can be configured in several ways: First, the reflective layer 205 is suitable for reflecting ultraviolet light from sunlight. Second, the reflective layer 205 is suitable for reflecting infrared light from sunlight. Third, the reflective layer 205 is suitable for reflecting both ultraviolet and infrared light from sunlight.

[0070] In this way, the reflective layer 205 reflects ultraviolet light and infrared light, that is, the reflective layer 205 can reflect energy that cannot be absorbed by the photovoltaic cell 201, thereby protecting the composite adhesive film 100, improving the anti-aging performance of the composite adhesive film 100, and avoiding excessive internal heat of the photovoltaic module 200, thereby enabling the photovoltaic module 200 to be used normally for a long time. In addition, the composite adhesive film 100 in the photovoltaic module 200 accelerates the diffusion of internal heat to the outside, the reflective layer 205 avoids ultraviolet light and infrared light from entering the inside of the photovoltaic module 200, the composite adhesive film 100 cooperates with the front cover plate 202 and the back cover plate 203 to accelerate the transmission of heat and optimize the absorption of sunlight, thereby reducing the internal temperature of the photovoltaic module 200 during operation, improving the power generation of the photovoltaic module 200, and reducing the risk of fire of the photovoltaic module 200, thereby further prolonging the service life of the photovoltaic module 200. Moreover, it also reduces the risk of hot spots of the photovoltaic module 200 and prolongs the service life of the photovoltaic module 200. In addition, the photovoltaic glass 204 protects the reflective layer 205, avoids damage to the reflective layer 205, and prolongs the service life of the reflective layer 205.

[0071] Optionally, the reflective layer 205 includes a silicon dioxide layer 2051, a hafnium dioxide layer 2052, a silver layer 2053, or a titanium layer 2054. For example, the reflective layer 205 includes one or more of the silicon dioxide layer 2051, the hafnium dioxide layer 2052, the silver layer 2053, and the titanium layer 2054. Figure 4 In an example, the reflective layer 205 includes, in order from top to bottom, the silicon dioxide layer 2051, the hafnium dioxide layer 2052, the silver layer 2053, the silicon dioxide layer 2051, and the titanium layer 2054, but is not limited thereto. The arrangement of the reflective layer 205 can be specifically arranged according to actual use to meet actual needs.

[0072] When the reflective layer 205 includes the silicon dioxide layer 2051, the silicon dioxide layer 2051 has important optical properties such as refractive index, projection rate, reflectivity, etc. In the range of ultraviolet light and infrared light, the silicon dioxide layer 2051 has a high reflectivity, thereby improving the reflection of ultraviolet light and infrared light by the reflective layer 205, and thereby improving the use performance of the reflective layer 205.

[0073] When the reflective layer 205 includes the hafnium dioxide layer 2052, the hafnium dioxide layer 2052 has good optical properties such as high refractive index, and brings a layer of substantial reflection film to the surface of the hafnium dioxide layer 2052, thereby reducing the passability of infrared light and ultraviolet light, and thereby improving the reflection of ultraviolet light and infrared light by the reflective layer 205.

[0074] When the silver layer 2053 is included in the reflection layer 205, the silver layer 2053 has good heat conduction and electrical conductivity, is soft and ductile, and has very high light reflectivity, and the reflectivity of the silver layer 2053 gradually decreases with the increase of the wavelength of light, and the silver layer 2053 can reflect ultraviolet light and infrared light, but the reflection effect of the silver layer 2053 on ultraviolet light is better than that on infrared light, so that the anti-aging ability of the reflection layer 205 is also improved under the reflection of the reflection layer 205.

[0075] When the titanium layer 2054 is included in the reflection layer 205, the titanium layer 2054 has high reflectivity, low weight and good corrosion resistance, and the titanium layer 2054 can reflect ultraviolet light and infrared light, but the reflection effect of the titanium layer 2054 on infrared light is better than that on ultraviolet light, so that the temperature inside the photovoltaic module 200 is also reduced through the reflection layer 205 under the reflection of the reflection layer 205.

[0076] The photovoltaic power generation system (not shown in the figure) according to the third aspect of the present application comprises the composite adhesive film 100 according to the first aspect of the present application or the photovoltaic module 200 according to the second aspect of the present application.

[0077] According to the photovoltaic power generation system of the present application, by using the above-mentioned composite adhesive film 100 or photovoltaic module 200, the power generation capacity of the photovoltaic power generation system is improved, and the service life of the photovoltaic power generation system is also prolonged.

[0078] The other configurations and operations of the photovoltaic module 200 and the photovoltaic power generation system according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0079] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0080] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example.

[0081] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A composite adhesive film, characterized in that, include: Film body; A graphene layer is disposed on at least one side of the film body in the thickness direction, and the graphene layer is adapted to be connected to the photovoltaic cells of a photovoltaic module.

2. The composite film according to claim 1, characterized in that, The graphene layer includes: The first graphene layer comprises a graphene nanosheet layer or a graphene hollow nanosphere layer.

3. The composite film according to claim 2, characterized in that, The graphene layer also includes: A second graphene layer is disposed between the first graphene layer and the film body, and the second graphene layer includes the graphene nanosheet layer or the graphene hollow nanosphere layer.

4. The composite film according to claim 3, characterized in that, The thickness of the first graphene layer is h1, wherein h1 satisfies: 5μm ≤ h1 ≤ 10μm; and / or, The thickness of the second graphene layer is h2, wherein h2 satisfies: 5μm≤h2≤10μm.

5. The composite film according to claim 2, characterized in that, The graphene hollow nanosphere layer comprises multiple graphene hollow nanospheres, the pore size of the graphene hollow nanospheres is D1, and the diameter of the graphene hollow nanospheres is D2, wherein D1 and D2 satisfy the following conditions: 3nm≤D1≤20nm and 30nm≤D2≤500nm, respectively.

6. The composite film according to claim 1, characterized in that, The graphene layers are multiple, and the multiple graphene layers are respectively disposed on both sides of the thickness direction of the adhesive film body. The graphene layers include: A first graphene layer and a second graphene layer, wherein the second graphene layer is disposed between the first graphene layer and the film body, the second graphene layer is a graphene hollow nanosphere layer, and the first graphene layer is a graphene nanosheet layer.

7. The composite film according to claim 1, characterized in that, The thickness of the adhesive film body is h3, wherein h3 satisfies: 0.5mm≤h3≤1mm.

8. The composite film according to any one of claims 1-7, characterized in that, The film body includes EVA film, POE film, EPE film or TPO film.

9. A photovoltaic module, characterized in that, Includes the composite film according to any one of claims 1-8.

10. The photovoltaic module according to claim 9, characterized in that, The composite adhesive film is multiple, and the photovoltaic module includes: Photovoltaic cells; A front cover and a back cover are respectively disposed on both sides of the photovoltaic cell in the thickness direction, and a plurality of composite films are respectively disposed between the front cover and the photovoltaic cell, and between the back cover and the photovoltaic cell.

11. The photovoltaic module according to claim 10, characterized in that, The front cover and the back cover each include: Photovoltaic glass; A reflective layer is disposed on the side of the photovoltaic glass closest to the photovoltaic cell, and the reflective layer is adapted to reflect ultraviolet light and / or infrared light in sunlight.

12. A photovoltaic power generation system, characterized in that, It includes the composite film according to any one of claims 1-8, or the photovoltaic module according to any one of claims 9-11.

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