A solar cell and an insulating adhesive therefor, a cell assembly and a photovoltaic system

Abstract

The application is suitable for the technical field of solar cells, and provides a solar cell, an insulating adhesive used by the solar cell, a battery assembly and a photovoltaic system. The transparent insulating adhesive used by the solar cell comprises the following components in percentage by mass: 60-80% of a resin component, 5-15% of an inorganic filler, 5-15% of a curing agent, less than 10% of a solvent and greater than or equal to 0.1% and less than 1% of a fluorescent agent. In this way, since the insulating adhesive is transparent, the shielding of sunlight can be reduced, more sunlight can be absorbed by the solar cell, and the photoelectric conversion efficiency can be improved. Meanwhile, since the transparent insulating adhesive comprises the fluorescent agent in percentage by mass greater than or equal to 0.1% and less than 1%, the transparent insulating adhesive can emit light under the irradiation of a light source with a corresponding wavelength, so that the position of the transparent insulating adhesive can be detected, and the accuracy of the solar cell in setting the transparent insulating adhesive can be improved.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and in particular relates to a solar cell, insulating adhesive for use therewith, cell module and photovoltaic system. Background Technology

[0002] Solar cell power generation is a sustainable and clean energy source that uses the photovoltaic effect of semiconductor pn junctions to convert sunlight into electrical energy.

[0003] In related technologies, insulating adhesive can be coated onto solar cells to achieve insulation between structures. However, colored insulating adhesives can block sunlight, affecting the photoelectric conversion efficiency of solar cells. Transparent insulating adhesives are difficult to detect visually.

[0004] Therefore, how to design a transparent insulating adhesive to facilitate testing has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a solar cell and an insulating adhesive therefor, a cell module, and a photovoltaic system, aiming to solve the problem of how to design a transparent insulating adhesive for easy inspection.

[0006] The transparent insulating adhesive for solar cells provided in this application includes:

[0007] The resin component comprises 60%-80% by weight.

[0008] Inorganic fillers, with a mass percentage of 5%-15%;

[0009] Hardener, 5%-15% by weight;

[0010] Solvent, with a mass percentage of less than 10%;

[0011] Fluorescent agent, with a mass percentage greater than or equal to 0.1% and less than 1%.

[0012] Optionally, the resin component includes at least one of modified polyacrylate, modified polyurethane, modified polyamide, modified polyesteramide, modified polycarbonate, modified silicone ester, modified styrene ester, polystyrene, polytetrafluoroethylene, polyoxymethylene, modified phenolic resin, modified polyester, modified polyamide, and modified epoxy resin.

[0013] Optionally, the inorganic filler includes talc.

[0014] Optionally, the talc powder includes at least one of barium sulfate, calcium carbonate, and titanium dioxide.

[0015] Optionally, the curing agent includes an imidazole derivative.

[0016] Optionally, the imidazole derivative includes at least one of fatty amines, aromatics, and acid anhydride curing agents.

[0017] Optionally, the solvent includes at least one of dimethyl adipate, dimethyl succinate, dimethyl glutarate, dimethyl malonate, diethyl adipate, diethyl succinate, diethyl glutarate, dibutyl succinate, dibutyl glutarate, DBE, DBE-3, DBE-4, DBE-6, DBE-9, DBE-IB, and DBE-ME.

[0018] Optionally, the fluorescent agent includes at least one of the following: fluorescent whitening agent OB-1, fluorescent whitening agent-OB, alumina, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide fluorescent compounds, polyphenylene, polythiophene, polyfluorene, polytriphenylamine, polytriphenylamine derivatives, polycarbazole, polypyrrole, polyporphyrin and its derivatives, copolymers, N,N-dimethylaminobenzyl dinitrile compounds, 8-hydroxyquinoline aluminum, and europium metal complexes.

[0019] The solar cell provided in this application includes an insulating element, which is made of insulating adhesive for solar cells according to any of the above claims.

[0020] The battery assembly provided in this application includes the aforementioned solar cell.

[0021] The photovoltaic system provided in this application includes the aforementioned battery modules.

[0022] The solar cells, insulating adhesive, battery modules, and photovoltaic systems of this application, due to the transparent nature of the insulating adhesive, reduce shading of sunlight, allowing more sunlight to be absorbed by the solar cells and improving photoelectric conversion efficiency. Simultaneously, because the transparent insulating adhesive contains a fluorescent agent at a mass percentage greater than or equal to 0.1% and less than 1%, it emits light under illumination of a light source of the corresponding wavelength, facilitating the detection of the transparent insulating adhesive's position and improving the accuracy of its placement on the solar cells. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] In this application, because the insulating adhesive is transparent, it reduces the obstruction of sunlight, allowing more sunlight to be absorbed by the solar cell, which is beneficial to improving the photoelectric conversion efficiency. Simultaneously, since the transparent insulating adhesive contains a fluorescent agent with a mass percentage greater than or equal to 0.1% and less than 1%, it will emit light under illumination of a light source of the corresponding wavelength, thus facilitating the detection of the transparent insulating adhesive's position and improving the accuracy of its placement on the solar cell.

[0029] Example 1

[0030] The transparent insulating adhesive for solar cells in this application includes:

[0031] The resin component comprises 60%-80% by weight.

[0032] Inorganic fillers, with a mass percentage of 5%-15%;

[0033] Hardener, 5%-15% by weight;

[0034] Solvent, with a mass percentage of less than 10%;

[0035] Fluorescent agent, with a mass percentage greater than or equal to 0.1% and less than 1%.

[0036] The transparent insulating adhesive for solar cells in this application embodiment reduces sunlight shading because it is transparent, allowing more sunlight to be absorbed by the solar cell and improving photoelectric conversion efficiency. Furthermore, since the transparent insulating adhesive contains a fluorescent agent at a mass percentage greater than or equal to 0.1% and less than 1%, it emits light under illumination of a light source of the corresponding wavelength, facilitating the detection of its position and improving the accuracy of its placement on the solar cell.

[0037] Please note that transparency means that the transmittance of the insulating adhesive to visible light is greater than or equal to 70% at a thickness of 20 micrometers.

[0038] In this embodiment, the solar cell can be a back-contact cell, and transparent insulating adhesive is used to insulate the sub-grids of the two polarities. For example, transparent insulating adhesive is coated on the sub-grid of the solar cell to cover the sub-grid and prevent it from conducting to the other polarity sub-grid through conductive components such as solder slag, solder strips or connecting strips, or the main grid.

[0039] It is understandable that for back-contact solar cells, both types of sub-grids are located on the back surface of the cell. If conductive foreign objects such as solder dross are present on the solar cell, the sub-grids of both polarities can easily become conductive, causing a short circuit. However, by coating the sub-grids with the transparent insulating adhesive of this embodiment, the risk of short circuits can be reduced. Furthermore, the transparent insulating adhesive of this embodiment is transparent, which, in single-glass modules, reduces the absorption and reflection of incident light penetrating the solar cell from the facing side, allowing this portion of the light to be reflected by the module backsheet and then re-irradiate the cell, thus improving module conversion efficiency. In double-glass modules, it reduces the reflection of incident light from the back surface and enhances the absorption of incident light from the back surface, enabling the solar cell to absorb more sunlight, improving bifaciality and conversion efficiency.

[0040] In other embodiments, the solar cell may be a bifacial contact cell, a TOPCON cell, an HJT cell, a PERC cell, a Metal Wrap Through (MWT) cell, or other types of cells. In other embodiments, a transparent insulating adhesive may be disposed between the two conductive structures requiring insulation, and is not limited to grid lines.

[0041] Specifically, transparent insulating adhesive can be applied to solar cells through methods such as screen printing, spraying, and coating.

[0042] Specifically, the transparent insulating adhesive covers more than 10% of the solar cell area.

[0043] Specifically, the mass percentage of the resin component is, for example, 60%, 62%, 65%, 70%, 73%, 75%, 78%, or 80%. This appropriate range of resin component mass percentages reduces the brittleness of the insulating component formed by the cured adhesive and improves its resistance to bending and impact.

[0044] Specifically, the mass percentage of inorganic fillers is, for example, 5%, 6%, 8%, 10%, 11%, 14%, and 15%. This allows for the use of relatively inexpensive inorganic fillers to reduce the amount of resin components, thereby lowering the cost of the transparent insulating adhesive. Furthermore, inorganic fillers enhance the mechanical properties of the transparent insulating adhesive, making it easier to apply and adhere.

[0045] Specifically, the mass percentage of the curing agent is, for example, 5%, 8%, 10%, 11%, 14%, or 15%. This allows the transparent insulating adhesive to cure within a predetermined process time.

[0046] Specifically, the mass percentage of the solvent is, for example, 9.99%, 9%, 7%, 5%, 4%, 2%, or 0.1%. This allows for the dissolution of other materials in the transparent insulating adhesive and adjustment of its viscosity.

[0047] Specifically, the mass percentage of the fluorescent agent is, for example, 0.99%, 0.95%, 0.8%, 0.6%, 0.5%, 0.3%, and 0.1%. Fluorescent agents can whiten the material, and a mass percentage greater than or equal to 1% can affect the light transmittance of the transparent insulating adhesive itself. However, a mass percentage of fluorescent agent greater than or equal to 0.1% and less than 1% results in better light transmittance of the insulating adhesive, which is beneficial for ensuring photoelectric conversion efficiency. Furthermore, a mass percentage of fluorescent agent greater than or equal to 0.1% and less than 1% will not lead to excessively high costs, which is beneficial for ensuring the detectability of the insulating adhesive while guaranteeing the normal operation of the solar cells and reducing the cost of solar cells.

[0048] Example 2

[0049] In some alternative embodiments, the resin component includes at least one of modified polyacrylate, modified polyurethane, modified polyamide, modified polyesteramide, modified polycarbonate, modified silicone ester, modified styrene ester, polystyrene, polytetrafluoroethylene, polyoxymethylene, modified phenolic resin, modified polyester, modified polyamide, and modified epoxy resin.

[0050] This provides a variety of resin components, adapting to more practical production scenarios and needs, and improving the production efficiency of transparent insulating adhesives. Furthermore, the resin components can reduce the brittleness of the insulating components formed by the curing of the transparent insulating adhesive, and improve the bending and impact resistance of the insulating components.

[0051] Specifically, the resin component includes one or more of the following: modified polyacrylate, modified polyurethane, modified polyamide, modified polyesteramide, modified polycarbonate, modified silicone ester, modified styrene ester, polystyrene, polytetrafluoroethylene, polyoxymethylene, modified phenolic resin, modified polyester, modified polyamide, and modified epoxy resin.

[0052] For example, resin components include modified polyacrylate, modified polyurethane, modified polyamide, modified polyesteramide, modified polycarbonate, modified silicone ester, modified styrene ester, polystyrene, polytetrafluoroethylene, polyoxymethylene, modified phenolic resin, modified polyester, modified polyamide, and modified epoxy resin; or, for example, resin components include modified polyacrylate and modified polyurethane; or, for yet another example, resin components include modified styrene ester, polystyrene, polytetrafluoroethylene, polyoxymethylene, and modified phenolic resin. The specific form of the resin components is not limited here.

[0053] Example 3

[0054] In some alternative embodiments, the inorganic filler includes talc.

[0055] In this way, the amount of resin components can be reduced by using relatively inexpensive talc, thereby lowering the cost of transparent insulating adhesive. Furthermore, talc can enhance the thermal stability and corrosion resistance of transparent insulating adhesive, resulting in better quality. Additionally, talc has insulating properties, which can improve the insulating performance of transparent insulating adhesive.

[0056] Example 4

[0057] In some alternative embodiments, talc includes at least one of barium sulfate, calcium carbonate, and titanium dioxide.

[0058] This provides a variety of talc powder forms, which can adapt to more actual production scenarios and needs, and help improve the production efficiency of transparent insulating adhesives.

[0059] Specifically, talc powder includes one, two, three, or other quantities of barium sulfate, calcium carbonate, and titanium dioxide. For example, talc powder includes barium sulfate, calcium carbonate, and titanium dioxide; or talc powder includes barium sulfate; or talc powder includes barium sulfate and titanium dioxide. These are merely examples, and the specific content of talc powder is not limited herein.

[0060] Example 5

[0061] In some alternative embodiments, the curing agent includes an imidazole derivative.

[0062] Therefore, using imidazole derivatives as curing agents can increase the curing speed of insulating adhesives and reduce curing costs.

[0063] Example 6

[0064] In some alternative embodiments, the imidazole derivative includes at least one of fatty amines, aromatics, and acid anhydride curing agents.

[0065] This provides a variety of curing agents, which can adapt to more actual production scenarios and needs, and help improve the production efficiency of transparent insulating adhesives.

[0066] Specifically, imidazole derivatives include one, two, or three of the following: fatty amines, aromatic compounds, and acid anhydride curing agents. For example, imidazole derivatives may include fatty amines, aromatic compounds, and acid anhydride curing agents; or imidazole derivatives may include fatty amines; or imidazole derivatives may include fatty amines and acid anhydride curing agents.

[0067] Specifically, aliphatic amines include ethylenediamine and / or phenylenediamine. For example, aliphatic amines include ethylenediamine; another example is phenylenediamine; yet another example is aliphatic amines that include both ethylenediamine and phenylenediamine.

[0068] Specifically, aromatic compounds include m-phenylenediamine and / or diaminodiphenylmethane. For example, aromatic compounds include m-phenylenediamine; or, as another example, aromatic compounds include diaminodiphenylmethane; or, as yet another example, aromatic compounds include both m-phenylenediamine and diaminodiphenylmethane.

[0069] Specifically, the anhydride curing agent includes phthalic anhydride and / or hexahydrophthalic anhydride. For example, the anhydride curing agent includes phthalic anhydride; or, for another example, the anhydride curing agent includes hexahydrophthalic anhydride; or, for yet another example, the anhydride curing agent includes both phthalic anhydride and hexahydrophthalic anhydride.

[0070] The above are merely examples and do not represent a limitation on the specific forms of imidazole derivatives.

[0071] Example 7

[0072] In some alternative embodiments, the solvent includes at least one of dimethyl adipate, dimethyl succinate, dimethyl glutarate, dimethyl malonate, diethyl adipate, diethyl succinate, diethyl glutarate, dibutyl succinate, dibutyl glutarate, DBE, DBE-3, DBE-4, DBE-6, DBE-9, DBE-IB, and DBE-ME.

[0073] In this way, diesters can better act as dissolving agents, reacting with resin components to form chain or cyclic polymers, which then evaporate to form stable solid compounds. Furthermore, this provides a variety of diester forms, adapting to more practical production scenarios and needs, and thus improving the production efficiency of insulating adhesives.

[0074] Specifically, the solvent includes one, two, or more of the following: dimethyl adipate, dimethyl succinate, dimethyl glutarate, dimethyl malonate, diethyl adipate, diethyl succinate, diethyl glutarate, dibutyl succinate, dibutyl glutarate, DBE, DBE-3, DBE-4, DBE-6, DBE-9, DBE-IB, and DBE-ME.

[0075] For example, solvents include dimethyl adipate, dimethyl succinate, dimethyl glutarate, dimethyl malonate, diethyl adipate, diethyl succinate, diethyl glutarate, dibutyl succinate, dibutyl glutarate, DBE, DBE-3, DBE-4, DBE-6, DBE-9, DBE-IB, and DBE-ME; solvents also include dimethyl adipate and dimethyl succinate; and solvents also include diethyl succinate, diethyl glutarate, dibutyl succinate, and dibutyl glutarate. The specific form of the solvent is not limited here.

[0076] Example 8

[0077] In some alternative embodiments, the fluorescent agent includes at least one of the following: fluorescent brightener OB-1, fluorescent brightener-OB, alumina, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent brightener BC, fluorescent brightener JD-3, fluorescent brightener BR, fluorescent brightener-EBF, fluorescent brightener R, fluorescent brightener ER, 1,8-naphthalimide fluorescent compounds, polyphenylene, polythiophene, polyfluorene, polytriphenylamine, polytriphenylamine derivatives, polycarbazole, polypyrrole, polyporphyrin and its derivatives, copolymers, N,N-dimethylaminobenzyl dinitrile compounds, aluminum 8-hydroxyquinoline, and europium metal complexes.

[0078] This provides a variety of fluorescent agents, which can adapt to more practical production scenarios and needs, and help improve the production efficiency of transparent insulating adhesives.

[0079] Specifically, rare earth fluorescent materials refer to fluorescent materials containing rare earth elements. That is, fluorescent materials containing at least one rare earth element selected from europium, samarium, erbium, and neodymium.

[0080] In one example, the fluorescent agent is optical brightener OB-1. When the insulating adhesive containing optical brightener OB-1 is irradiated with ultraviolet light, the visible fluorescence color is blue, and the visual effect is strong.

[0081] In the table below, the resin components, curing agent, and solvent of the transparent insulating adhesive are: 70% phenolic epoxy resin, 10% imidazole derivative, and 5% anisole. The fluorescent agent is OB-1, and the inorganic filler is barium sulfate. The mass percentages of OB-1 and barium sulfate are shown in the table below.

[0082] The table below shows the fluorescence grayscale value and transmittance of transparent insulating adhesive at various dosages of fluorescent whitening agent OB-1 at a thickness of 20 micrometers. It can be understood that the fluorescence grayscale value characterizes the fluorescence effect. Clearly, when the mass percentage of the fluorescent agent is greater than or equal to 1%, although the fluorescence effect of the transparent insulating adhesive is strong, the transmittance is poor. When the mass percentage of the fluorescent agent is greater than or equal to 0.1% and less than 1%, the fluorescence of the transparent insulating adhesive is sufficient to be detected, and the transmittance is good. Therefore, a mass percentage of the fluorescent agent greater than or equal to 0.1% and less than 1% ensures detectability and fluorescence effect, resulting in a better overall performance of the transparent insulating adhesive.

[0083]

[0084]

[0085] Please note that specific data for the fluorescent agent OB-1 are provided here. Other fluorescent agents, such as fluorescent whitening agent-OB, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide fluorescent compounds, polyphenylene, polythiophene, polyfluorene, polytriphenylamine, polytriphenylamine derivatives, polycarbazole, polypyrrole, polyporphyrin and its derivatives, copolymers, N,N-dimethylaminobenzyl dinitrile compounds, 8-hydroxyquinoline aluminum, and europium metal complexes, when their mass percentage is greater than or equal to 0.1% and less than 1%, have gray values ​​ranging from 100 to 300 for fluorescence effect, viscosity values ​​ranging from 150 to 300 for printability, and transmittance ranging from 85% to 90%. To avoid redundancy, these will not be elaborated further here.

[0086] In other embodiments, the fluorescent agent may include fluorescent whitening agent-OB; in other embodiments, the fluorescent agent may include barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3; in other embodiments, the fluorescent agent may include fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, or 1,8-naphthalimide fluorescent compounds. The specific form of the fluorescent agent is not limited herein.

[0087] Specifically, at least one of green light, blue light, infrared light, ultraviolet light, and white light can be used to irradiate the solar cell, causing the insulating component formed by the curing of the transparent insulating adhesive to emit fluorescence, thereby accurately detecting the position of the transparent insulating adhesive.

[0088] Example 9

[0089] The solar cell of this application includes an insulating component, which is made of insulating adhesive for solar cells according to any one of embodiments one to eight.

[0090] In this embodiment of the solar cell, the insulating adhesive is transparent, which reduces the obstruction of sunlight, allowing more sunlight to be absorbed by the solar cell and improving photoelectric conversion efficiency. Simultaneously, since the transparent insulating adhesive contains a fluorescent agent with a mass percentage greater than or equal to 0.1% and less than 1%, it emits light under illumination of a light source of the corresponding wavelength, facilitating the detection of the transparent insulating adhesive's position and improving the accuracy of its placement on the solar cell.

[0091] Example 10

[0092] The battery assembly of this application includes the solar cell of Embodiment Nine.

[0093] In the battery assembly of this application embodiment, since the insulating adhesive is transparent, it reduces the obstruction of sunlight, allowing more sunlight to be absorbed by the solar cells, which is beneficial to improving photoelectric conversion efficiency. Simultaneously, since the transparent insulating adhesive includes a fluorescent agent with a mass percentage greater than or equal to 0.1% and less than 1%, it will emit light under illumination of a light source of the corresponding wavelength, thereby facilitating the detection of the transparent insulating adhesive's position and improving the accuracy of the transparent insulating adhesive placement on the solar cells.

[0094] In this embodiment, multiple solar cells in the battery module can be connected in series to form a battery string, thereby achieving series current output. For example, the battery cells can be connected in series by setting solder strips (busbars, interconnecting strips), conductive backplates, etc.

[0095] It is understood that in such embodiments, the battery assembly may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the solar cells, the photovoltaic glass, and adjacent cells. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0096] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cells while minimizing impact on their efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cells together, providing sealing, insulation, and waterproofing / moisture protection for the solar cells.

[0097] The backsheet can be attached to the encapsulating film on the back of the solar cell. The backsheet protects and supports the solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulating film, etc., depending on the specific circumstances and not limited here. The backsheet, solar cell, encapsulating film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0098] Example 11

[0099] The photovoltaic system of this application includes the battery module of Embodiment 10.

[0100] In the photovoltaic system of this application embodiment, since the insulating adhesive is transparent, it reduces the obstruction of sunlight, allowing more sunlight to be absorbed by the solar cells, which is beneficial to improving photoelectric conversion efficiency. Simultaneously, because the transparent insulating adhesive contains a fluorescent agent with a mass percentage greater than or equal to 0.1% and less than 1%, it will emit light under illumination of a light source of the corresponding wavelength, thus facilitating the detection of the transparent insulating adhesive's position and improving the accuracy of the transparent insulating adhesive placement on the solar cells.

[0101] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0102] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0103] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A transparent insulating adhesive for solar cells, characterized in that, Its composition is as follows: The resin component, with a mass percentage of 60%-80%, is phenolic epoxy resin; The inorganic filler, with a mass percentage of 5%-15%, is barium sulfate; The curing agent, with a mass percentage of 5%-15%, is an imidazole derivative; The solvent, with a mass percentage of less than 10%, is anisole; The fluorescent agent, specifically fluorescent whitening agent OB-1, has a mass percentage greater than or equal to 0.1% and less than 1%, and is used to detect the position of the transparent insulating adhesive; transparency means that the insulating adhesive, at a thickness of 20 micrometers, has a light transmittance of greater than or equal to 70% for visible light. The light transmittance of the transparent insulating adhesive is 85%-90%.

2. A solar cell, characterized in that, Includes an insulating component, said insulating component being made of the transparent insulating adhesive for solar cells as described in claim 1.

3. A battery assembly, characterized in that, Includes the solar cell described in claim 2.

4. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 3.

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