Photovoltaic module

Abstract

The utility model provides a photovoltaic assembly, relates to the field of photovoltaic technology, and aims to solve the problem of large attenuation of battery power of a conventional photovoltaic assembly in the related technology. The photovoltaic module comprises a battery piece layer; the first supporting layer is arranged on one side of the battery piece layer; the first isolation layer is arranged on one side, far away from the battery piece layer, of the first supporting layer; the first POE adhesive layer is arranged between the battery piece layer and the first supporting layer; the first EVA adhesive layer is arranged between the first isolating layer and the first supporting layer. According to the photovoltaic module provided by the utility model, the POE adhesive film is connected with the battery piece layer, so that the problem of large attenuation of the battery piece layer under high-temperature and high-humidity conditions is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module. Background Technology

[0002] POE (Polyolefin Elastomer) and EVA (Ethylene Vinyl Acetate) adhesive layers are commonly used bonding layers in photovoltaic modules. However, current photovoltaic modules typically use the same type of adhesive layer, such as only POE or only EVA. If only POE is used, the adhesion between the ETFE (Ethylene Tetrafluoroethylene) separator and POE is low, leading to problems such as ETFE separator lifting after long-term use. If only EVA is used, the battery will experience internal stress concentration at high temperatures, causing the EVA adhesive layer to crack and peel off, making it easier for water and oxygen to enter the battery, resulting in significant power degradation in humid and hot environments. Utility Model Content

[0003] The present invention aims to at least solve the problem of large power degradation of conventional photovoltaic modules in related technologies.

[0004] Therefore, the first aspect of this utility model provides a photovoltaic module, comprising: a cell layer; a first support layer disposed on one side of the cell layer; a first insulating layer disposed on the side of the first support layer away from the cell layer; a first POE adhesive layer disposed between the cell layer and the first support layer; and a first EVA adhesive layer disposed between the first insulating layer and the first support layer.

[0005] The photovoltaic module provided by this invention connects the cell layers using a POE adhesive film. The POE adhesive layer is a non-polar material and cannot form hydrogen bonds with water molecules, resulting in low water vapor permeability and effectively preventing airborne moisture from entering the cell. Compared to EVA adhesive layers, this effectively solves the problem of significant cell degradation under high temperature and humidity conditions. Secondly, unlike EVA adhesive layers, the POE adhesive layer does not produce corrosive substances such as acetate ions, thus extending the lifespan of the cell layers. Furthermore, the EVA adhesive layer connects the first separator layer and the first support layer. Since EVA adhesive layer is a polar material, while commonly used separator layers (such as PVDF (Polyvinylidene Fluoride) and ETFE) are relatively weakly polar materials, the interface compatibility between the EVA adhesive layer and the first separator layer is good, improving the connection strength.

[0006] In some technical solutions, the cell layer optionally includes a TOPCon (Tunnel Oxide Passivated Contact) cell layer.

[0007] In this technical solution, the power degradation of TOPCon cells is more pronounced in humid and hot environments, therefore the solution in this application is particularly suitable for photovoltaic modules using TOPCon cells.

[0008] In some technical solutions, the first isolation layer may optionally include a PVDF layer and / or an ETFE layer.

[0009] In this technical solution, PVDF and ETFE are both materials with weak polarity and fluorine groups, while EVA adhesive layer is a polar material and POE is a non-polar material. Therefore, the interface compatibility between EVA adhesive layer and PVDF layer and / or ETFE layer is good, and the adhesion is better than that of POE adhesive layer, which can solve the problem of the isolation layer lifting and curling after long-term use.

[0010] In some technical solutions, optionally, the thickness of the first POE adhesive layer is greater than or equal to 0.45 mm and less than or equal to 0.55 mm. The mass of the first POE adhesive layer per square meter is greater than or equal to 390 g and less than or equal to 450 g.

[0011] In these technical solutions, by controlling the thickness and weight of the first POE adhesive layer, the waterproof performance of the first POE adhesive layer can be ensured, thereby reducing the power decay of the TOPCon battery under humid and hot conditions, and also preventing the first POE adhesive layer from cracking and peeling off.

[0012] In some technical solutions, the photovoltaic module may optionally include: a second support layer disposed on the side of the cell layer away from the first support layer; a second insulating layer disposed on the side of the second support layer away from the cell layer; a second POE adhesive layer disposed between the cell layer and the second support layer; and a second EVA adhesive layer disposed between the second insulating layer and the second support layer.

[0013] In these technical solutions, the first and second support layers provide double-sided support for the cells, thereby improving the overall impact resistance of the photovoltaic module. Both the first and second isolation layers are exposed to sunlight, thus achieving bifacial power generation. Similarly, a second POE adhesive layer connects the cell layer and the second support layer, reducing power attenuation of the cell layer under humid and hot conditions, and a second EVA adhesive layer connects the second isolation layer and the second support layer, improving the stability of the second isolation layer.

[0014] In some technical solutions, optionally, the thickness of the first EVA adhesive layer is greater than or equal to 0.4 mm and less than or equal to 0.5 mm. The mass of the first EVA adhesive layer per square meter is greater than or equal to 360 g and less than or equal to 420 g.

[0015] In these technical solutions, by controlling the thickness and basis weight of the first EVA adhesive layer, the connection strength between the first isolation layer and the first support layer can be ensured.

[0016] In some technical solutions, the first support layer may optionally include a PET (Polyethylene Terephthalate) layer.

[0017] Among these technical solutions, PET has excellent physical and mechanical properties, chemical resistance, optical properties, and electrical properties, and therefore can be used as a support layer for photovoltaic modules.

[0018] In some technical solutions, optionally, the first support layer has two or more layers.

[0019] In some technical solutions, optionally, the transparency of the first support layer is greater than or equal to 90%.

[0020] In these technical solutions, a minimum transparency of the first support layer is defined to ensure power generation efficiency.

[0021] In some technical solutions, optionally, the thickness of the first support layer is greater than or equal to 0.25 mm and less than or equal to 0.35 mm.

[0022] In these technical solutions, controlling the thickness of the first support layer improves the impact resistance of the photovoltaic module, prevents damage under external forces, and extends the service life of the photovoltaic module.

[0023] In some technical solutions, optionally, the total thickness of the first support layer, the first POE adhesive layer and the first EVA adhesive layer is greater than or equal to 1 mm and less than or equal to 2 mm.

[0024] In some technical solutions, optionally, the total thickness of the photovoltaic module is greater than or equal to 4.5 mm and less than or equal to 5.5 mm.

[0025] In this technical solution, the total thickness of the photovoltaic module is preferably set to 4.5mm to 5.5mm, which ensures the overall performance of the product while preventing the total thickness from being too large, making it convenient for outdoor carrying.

[0026] In some technical solutions, optionally, the cell layer includes multiple spaced polycrystalline silicon cells, and the photovoltaic module also includes multiple cell support frames, with one cell support frame arranged around the outside of each polycrystalline silicon cell.

[0027] In this technical solution, a battery support frame is arranged around the outside of each polycrystalline silicon cell, thereby protecting the polycrystalline silicon cell from damage caused by external impacts.

[0028] In some technical solutions, the battery support frame may optionally include a fiberglass frame.

[0029] In these technical solutions, the fiberglass frame has good impact resistance, thereby improving the strength of the battery support frame.

[0030] In some technical solutions, optionally, the gap between the polycrystalline silicon cell and the cell support frame is greater than or equal to 3mm.

[0031] In these technical solutions, a certain gap is provided between the polycrystalline silicon cell and the cell support frame. This allows the cell support frame to have a certain displacement buffer when subjected to external force, thereby preventing the polycrystalline silicon cell from being scratched and damaged.

[0032] In some technical solutions, optionally, the multiple battery support frames include a first battery frame located at both ends and a second battery frame located between the two first battery frames, and the first battery frame is provided with a hollow structure.

[0033] In these technical solutions, the first battery frame is located at both ends of the entire frame structure. The first battery frame is provided with a hollow structure, which facilitates the user to unfold and fold the photovoltaic module. That is, the user puts his / her hand into the hollow structure to unfold and fold the photovoltaic module.

[0034] In some technical solutions, optionally, the first battery frame includes at least one enclosure panel and a handle panel, the handle panel and at least one enclosure panel enclosing an installation space, the polycrystalline silicon battery being disposed in the installation space, the handle panel including a fiberglass mesh-epoxy resin composite board, and the enclosure panel including a polyester fiberglass board.

[0035] In these technical solutions, the handle panel includes a fiberglass mesh-epoxy resin composite board. Since the fiberglass mesh is mesh-like, it is equivalent to bi-directional wire drawing, which makes the deformation resistance of the handle panel almost the same in different directions, thereby avoiding the problem of handle panel breakage.

[0036] In some technical solutions, optionally, the gap between any two adjacent battery support frames is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0037] In some technical solutions, optionally, the number of polycrystalline silicon cells is greater than or equal to 3 and less than or equal to 5.

[0038] In these technical solutions, different numbers of polycrystalline silicon cells are used depending on different power generation needs. For example, there could be 3, 4, or 5 cells. Attached Figure Description

[0039] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0040] Figure 1 A schematic diagram of the structure of a photovoltaic module according to an embodiment of this application is shown;

[0041] Figure 2 A schematic diagram of the structure of a battery support frame according to an embodiment of this application is shown;

[0042] Figure 3 This illustration shows a schematic diagram of the structure of a battery support frame and a polycrystalline silicon battery according to an embodiment of this application.

[0043] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0044] 2. Photovoltaic module, 201 First insulating layer, 202 First EVA adhesive layer, 203 First support layer, 204 First POE adhesive layer, 205 Cell layer, 2051 Polycrystalline silicon cell, 206 Second POE adhesive layer, 207 Second support layer, 208 Second EVA adhesive layer, 209 Second insulating layer, 210 Cell support frame, 2102 First cell frame, 21022 Enclosure panel, 21024 Handle panel, 21026 Installation space, 21028 Hollow structure, 2104 Second cell frame, 2106 Connecting film. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0047] like Figure 1 and Figure 2As shown, the first aspect of this utility model provides a photovoltaic module 2, including a cell layer 205, a first support layer 203, a first insulating layer 201, a first POE adhesive layer 204, and a first EVA adhesive layer 202. The first support layer 203 is disposed on one side of the cell layer 205, and its main function is to support the cell layer 205 and improve the safety performance of the cell layer 205. The first insulating layer 201 is disposed on the side of the first support layer 203 away from the cell layer 205. The insulating layer is also the surface layer. The insulating layer is disposed on the outermost layer of the photovoltaic module 2, which isolates the photovoltaic module 2 from the external environment and protects the photovoltaic module 2 as a whole. Its main functions are to resist ultraviolet rays and weathering. The first POE adhesive layer 204 is disposed between the cell layer 205 and the first support layer 203 for connection between the cell layer 205 and the first support layer 203. The first EVA adhesive layer 202 is disposed between the first insulating layer 201 and the first support layer 203 for connection between the first insulating layer 201 and the first support layer 203.

[0048] The photovoltaic module 2 provided by this utility model connects the cell layer 205 via a POE adhesive film. The POE adhesive layer is a non-polar material and cannot form hydrogen bonds with water molecules, resulting in low water vapor permeability. This effectively prevents water vapor in the air from entering the cell, thus effectively solving the problem of high degradation of the cell layer 205 under high temperature and humidity conditions compared to EVA adhesive layers. Secondly, compared to EVA adhesive layers, the POE adhesive layer does not produce corrosive substances such as acetate ions, which can improve the service life of the cell layer 205. Furthermore, the first separator layer 201 and the first support layer 203 are connected via an EVA adhesive layer. Since the EVA adhesive layer is a polar material, while commonly used separators are made of less polar materials, the interface compatibility between the EVA adhesive layer and the first separator layer 201 is good, improving the connection strength.

[0049] In the above embodiments, the battery cell layer 205 may optionally include a TOPCon battery layer.

[0050] In this embodiment, TOPCon cells may experience internal stress concentration due to issues such as hydrogen atom overflow from the polycrystalline silicon layer at high temperatures, making the adhesive layer prone to cracking and peeling. This allows water and oxygen to more easily enter the cell, resulting in significant power attenuation under humid and hot conditions. POE films, on the other hand, have extremely low water permeability. Therefore, the solution proposed in this application is particularly suitable for photovoltaic modules 2 using TOPCon cells.

[0051] The applicant needs to emphasize that when other types of batteries are replaced, the power degradation of other types of batteries is not obvious in humid and hot environments. Therefore, the improvement proposed in this application is mainly aimed at polycrystalline silicon batteries such as TOPCon batteries, which have more obvious power degradation in humid and hot environments.

[0052] In the above embodiments, the first isolation layer 201 may optionally include a PVDF layer and / or an ETFE layer.

[0053] In this embodiment, the PVDF and ETFE layers primarily serve to provide UV resistance and weather resistance. Furthermore, both PVDF and ETFE are weakly polar materials containing fluorine groups, while the EVA adhesive layer is a polar material and POE is a non-polar material. Therefore, the EVA adhesive layer exhibits better interfacial compatibility with the PVDF and / or ETFE layers, and its adhesion is superior to that of the POE adhesive layer, effectively resolving issues such as the release flaking and lifting of the release liner after long-term use.

[0054] Of course, depending on the requirements, the first isolation layer 201 can also be a PVF (Polyvinyl Fluoride) layer. The PVF layer also has good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, and is suitable for use as an isolation layer for photovoltaic module 2.

[0055] Of course, the first isolation layer 201 can also be a composite layer composed of two or three of PVDF, ETFE and PVF.

[0056] In the above embodiments, optionally, the thickness of the first POE adhesive layer 204 is greater than or equal to 0.45 mm and less than or equal to 0.55 mm. Optionally, the thickness of the first POE adhesive layer 204 is equal to 0.45 mm, 0.5 mm, or 0.55 mm.

[0057] In the above embodiments, optionally, the mass of the first POE adhesive layer 204 per square meter is greater than or equal to 390g and less than or equal to 450g. That is, the basis weight of the first POE adhesive layer 204 is 420±30g / m². 2 Optionally, the mass of the first POE adhesive layer 204 per square meter is equal to 400g, 410g, or 420g.

[0058] In these technical solutions, by controlling the thickness and weight of the first POE adhesive layer 204, the waterproof performance of the first POE adhesive layer 204 can be ensured, thereby reducing the power decay of the TOPCon battery under humid and hot conditions, and also preventing the first POE adhesive layer 204 from cracking and peeling off.

[0059] In the above embodiments, optionally, the photovoltaic module 2 further includes a second support layer 207, a second isolation layer 209, a second POE adhesive layer 206, and a second EVA adhesive layer 208. The second support layer 207 is disposed on the side of the cell layer 205 away from the first support layer 203; the second isolation layer 209 is disposed on the side of the second support layer 207 away from the cell layer 205; the second POE adhesive layer 206 is disposed between the cell layer 205 and the second support layer 207; and the second EVA adhesive layer 208 is disposed between the second isolation layer 209 and the second support layer 207.

[0060] In these technical solutions, the photovoltaic module 2 consists of, from one side to the other (e.g., from top to bottom), a first insulating layer 201, a first EVA adhesive layer 202, a first support layer 203, a first POE adhesive layer 204, a cell layer 205, a second POE adhesive layer 206, a second support layer 207, a second EVA adhesive layer 208, and a second insulating layer 209. The first support layer 203 and the second support layer 207 provide double-sided support for the cells, thereby improving the overall impact resistance of the photovoltaic module 2. The second insulating layer 209 is located on the side of the second support layer 207 away from the cell layer 205. Both the first insulating layer 201 and the second insulating layer 209 are used to contact sunlight and isolate ultraviolet rays and impurities, thereby achieving double-sided power generation.

[0061] In other words, the photovoltaic module 2 of this application is bifacial power generation. With the cell layer 205 as the center, the upper and lower structures are symmetrical, thereby providing bifacial protection for the cell layer 205 and realizing bifacial power generation.

[0062] Similarly, the second POE adhesive layer 206 connects the battery cell layer 205 and the second support layer 207, reducing the power degradation of the battery cell layer 205 under humid and hot conditions, and the second EVA adhesive layer 208 connects the second isolation layer 209 and the second support layer 207, improving the stability of the second isolation layer 209.

[0063] In addition, the second isolation layer 209 is made of the same material as the first isolation layer 201, and can also be one or more composite layers of PVDF, ETFE and PVF.

[0064] In the above embodiments, optionally, the thickness of the first EVA adhesive layer 202 is greater than or equal to 0.4 mm and less than or equal to 0.5 mm. Optionally, the thickness of the first EVA adhesive layer 202 is equal to 0.4 mm, 0.45 mm, or 0.5 mm. The mass of the first EVA adhesive layer 202 per square meter is greater than or equal to 360 g and less than or equal to 420 g. Optionally, the mass of the first EVA adhesive layer 202 per square meter is equal to 380 g, 400 g, or 420 g.

[0065] In these technical solutions, by controlling the thickness and basis weight of the first EVA adhesive layer 202, the connection strength between the first insulating layer 201 and the first support layer 203 can be ensured. Of course, the thickness and basis weight of the first EVA adhesive layer 202 should not be too large, as excessive thickness and basis weight will affect the thickness and weight of the photovoltaic module 2 and waste materials.

[0066] Furthermore, the thickness and basis weight of the second EVA adhesive layer 208 can be the same as those of the first EVA adhesive layer 202. That is, the thickness of the second EVA adhesive layer 208 is greater than or equal to 0.4 mm and less than or equal to 0.5 mm. The mass of the second EVA adhesive layer 208 per square meter is greater than or equal to 360 g and less than or equal to 420 g.

[0067] In the above embodiments, optionally, the first support layer 203 includes a PET layer.

[0068] In these technical solutions, PET has excellent physical and mechanical properties, chemical resistance, optical properties, and electrical properties, and therefore can be used as a support layer for photovoltaic module 2.

[0069] In addition, PET has high light transmittance, which can effectively transmit sunlight and improve the power generation efficiency of photovoltaic module 2. In this application, the transparency of the first support layer 203 is greater than or equal to 90%, and optionally, the transparency of the first support layer 203 is greater than or equal to 95%, for example, 97% or 98%, thereby ensuring power generation efficiency. Furthermore, PET has good weather resistance and can be used in harsh environmental conditions, extending the service life of photovoltaic module 2.

[0070] In addition, the second support layer 207 can also be a PET layer. Of course, depending on different needs, the first support layer 203 and the second support layer 207 can also be made of EPE (Expanded Polyethylene). EPE has excellent cushioning, heat insulation, and moisture-proof properties, and therefore can also be used as a support layer for the photovoltaic module 2. EPE can effectively protect the photovoltaic module 2 from impacts and vibrations, improving the reliability of the photovoltaic module 2. Furthermore, the heat insulation properties of EPE can effectively reduce the temperature of the photovoltaic module 2, improving its power generation efficiency.

[0071] In the above embodiments, optionally, the first support layer 203 has two or more layers. The number of layers in the first support layer 203 depends on the application environment of the photovoltaic module 2. In environments with high impact resistance requirements, it can be set to three or more layers, while in environments with low impact resistance requirements, it can be set to one layer. The number of layers in the first support layer 203 and the second support layer 207 can be the same or different.

[0072] In the above embodiments, optionally, the thickness of the first support layer 203 is greater than or equal to 0.25 mm and less than or equal to 0.35 mm. Optionally, the thickness of the first support layer 203 is equal to 0.25 mm, 0.3 mm, or 0.35 mm.

[0073] In this embodiment, the thickness of the first support layer 203 is controlled to improve the impact resistance of the photovoltaic module 2, prevent damage under external force, and improve the service life of the photovoltaic module 2.

[0074] Furthermore, the thickness of the second support layer 207 can be the same as the thickness of the first support layer 203, or it can be different depending on the requirements. For example, the thickness of the second support layer 207 is greater than or equal to 0.5 mm and less than or equal to 0.7 mm. Optionally, the thickness of the second support layer 207 is equal to 0.5 mm, 0.6 mm, or 0.7 mm.

[0075] In the above embodiments, optionally, the total thickness of the first support layer 203, the first POE adhesive layer 204, and the first EVA adhesive layer 202 is greater than or equal to 1 mm and less than or equal to 2 mm. Optionally, 1 mm or 2 mm.

[0076] In this embodiment, the first support layer 203, the first POE adhesive layer 204 and the first EVA adhesive layer 202 can provide the photovoltaic module 2 with a certain strength and toughness, and the total thickness of the three is set to 1mm to 2mm.

[0077] Similarly, the total thickness of the second support layer 207, the second POE adhesive layer 206, and the second EVA adhesive layer 208 can also be set to be greater than or equal to 1 mm and less than or equal to 2 mm. Optionally, 1 mm or 2 mm.

[0078] In the above embodiments, optionally, the total thickness of the photovoltaic module 2 is greater than or equal to 4.5 mm and less than or equal to 5.5 mm. Optionally, 4.5 mm, 5 mm, or 5.5 mm.

[0079] In this embodiment, the total thickness of the photovoltaic module 2 is preferably set to 4.5mm to 5.5mm, which ensures the overall performance of the product while preventing the total thickness from being too large, making it convenient for outdoor carrying.

[0080] In the above embodiments, optionally, the cell layer 205 includes a plurality of polycrystalline silicon cells 2051 spaced apart, and the photovoltaic module 2 also includes a plurality of cell support frames 210, with a cell support frame 210 surrounding the outside of each polycrystalline silicon cell 2051.

[0081] In this embodiment, the battery cell layer 205 is composed of multiple polycrystalline silicon cells 2051. Each polycrystalline silicon cell 2051 is surrounded by a battery support frame 210, which can protect the polycrystalline silicon cell 2051 from damage by external impact.

[0082] In the above embodiments, the battery support frame 210 may optionally include a fiberglass frame.

[0083] In these technical solutions, the fiberglass frame has good impact resistance, thereby improving the strength of the battery support frame 210.

[0084] In addition, to enhance the overall strength of the battery support frame 210, the battery support frame 210 can be a one-piece molded structure.

[0085] In the above embodiments, optionally, the gap between the polycrystalline silicon cell 2051 and the cell support frame 210 is greater than or equal to 3 mm.

[0086] In these technical solutions, a certain gap is provided between the polycrystalline silicon cell 2051 and the cell support frame 210. This allows the cell support frame 210 to have a certain displacement buffer when subjected to external force, thereby preventing the polycrystalline silicon cell 2051 from being scratched and damaged. However, the gap should not be too large, as an excessively large gap would result in a large volume of the entire cell layer. Optionally, the gap between the polycrystalline silicon cell 2051 and the cell support frame 210 is less than or equal to 5 mm. For example, 3 mm, 4 mm, or 5 mm.

[0087] In the above embodiment, optionally, the plurality of battery support frames 210 include a first battery frame 2102 located at both ends and a second battery frame 2104 located between the two first battery frames 2102, and the first battery frame 2102 is provided with a hollow structure 21028.

[0088] In these technical solutions, the first battery frame 2102 is located at both ends of the entire frame structure, and multiple second battery frames 2104 are located between the two first battery frames 2102. Since the photovoltaic module 2 needs to be unfolded and folded, a hollow structure 21028 is provided on the first battery frame 2102. The user puts his / her hand into the hollow structure 21028 to unfold and fold the photovoltaic module 2.

[0089] In addition, a handle can be installed at the position of the hollow structure 21028, which makes it more convenient for users to operate.

[0090] In the above embodiments, optionally, the first battery frame 2102 includes at least one enclosure 21022 and a handle 21024, the handle 21024 and at least one enclosure 21022 enclosing an installation space 21026, the polycrystalline silicon battery 2051 is disposed in the installation space 21026, the handle 21024 includes a glass fiber mesh-epoxy resin composite board, and the enclosure 21022 includes a polyester glass fiber board.

[0091] In these technical solutions, a handle plate 21024 and at least one surrounding plate 21022 enclose an installation space 21026. A polycrystalline silicon solar cell 2051 is disposed in the installation space 21026, and a perforated structure 21028 is provided on the handle plate 21024. The handle plate 21024 comprises a fiberglass mesh-epoxy resin composite board. Because the fiberglass mesh is mesh-like, equivalent to bidirectional wire drawing, the deformation resistance of the handle plate 21024 is almost the same in different directions, thus avoiding the problem of breakage. That is, the tensile strength of the handle plate 21024 is the same or almost the same in the length and width directions, resulting in small differences in deformation resistance in different directions, thereby avoiding the problem of breakage.

[0092] It should be noted that the statement that the tensile strength of the handle plate 21024 is the same or almost the same in the length and width directions means that the difference between the tensile strength of the handle plate 21024 in the length and width directions is less than a preset value, or the ratio of the difference to the tensile strength in the length direction is less than or equal to 5%, or the ratio of the difference to the tensile strength in the width direction is less than or equal to 5%. The length and width directions refer to the length and width directions of the handle plate 21024, respectively.

[0093] In the above embodiments, optionally, the gap between any adjacent battery support frames 210 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, for example, 0.1 mm or 0.3 mm.

[0094] A gap is provided between adjacent battery support frames 210, which is equivalent to each battery and its corresponding battery frame being independent of each other. On the one hand, this helps heat dissipation between batteries, and on the other hand, it can prevent the battery support frames 210 from colliding with each other and damaging the batteries.

[0095] In the above embodiments, optionally, the number of polycrystalline silicon cells 2051 is greater than or equal to 3 and less than or equal to 5.

[0096] In these technical solutions, different numbers of polycrystalline silicon cells 2051 are set according to different power generation needs. The greater the power generation demand, the more polycrystalline silicon cells 2051 are used, and the smaller the demand, the fewer polycrystalline silicon cells 2051 are used. In this application, the number of polycrystalline silicon cells 2051 can be 3, 4 or 5.

[0097] Another embodiment of this utility model provides a photovoltaic module 2, which needs to be understood as follows:

[0098] 1. Currently, TOPCon batteries are widely used in industrial and commercial modules, and also have some applications in portable modules;

[0099] 2. In portable applications, TOPCon batteries are generally encapsulated in glass and POE film is used to solve the PID (Potential Induced Degradation) effect.

[0100] 3. Portable components without glass encapsulation will not have PID effect. However, when using EVA film encapsulation, TOPCon batteries may experience internal stress concentration due to issues such as hydrogen atom overflow from the polycrystalline silicon layer at high temperatures. This can lead to cracking and peeling of the film, making it easier for water and oxygen to enter the battery. This results in significant power degradation in humid and hot environments.

[0101] 4. When POE non-polar material is used as the adhesive layer for the ETFE isolation layer, low adhesion will cause problems such as the ETFE isolation layer lifting after long-term use.

[0102] The photovoltaic module 2 of this utility model has the following specific structure from top to bottom: ETFE / PVDF film, EVA film, first transparent PET, POE film, TOPCon cell and frame, POE film, second transparent PET, EVA film and ETFE / PVDF.

[0103] ETFE / PVDF membranes primarily serve to resist ultraviolet radiation and weathering.

[0104] The EVA film has a basis weight of 390±30g / m³. 2 With a thickness of 0.45±0.05mm, the EVA film is a polar material with good interfacial compatibility with ETFE (which is weakly polar but contains fluorine groups). Its adhesion to PVDF or ETFE film is above 40N / cm. However, due to the presence of corrosive components such as acetate, it cannot directly contact TOPCon batteries or solder ribbons.

[0105] The first transparent PET has a thickness of 0.3±0.05mm and a light transmittance of over 90%, and is mainly used to protect the battery cells from the front.

[0106] The basis weight of the POE film is 420±30 g / m². 2With a thickness of 0.5±0.05mm, the POE film is in direct contact with the battery. As a non-polar material, it cannot form hydrogen bonds with water molecules, and its water vapor permeability is only one-tenth that of EVA material, which can more effectively prevent water vapor from entering the module. Moreover, the POE film does not contain acetate or other corrosive components, has stable chemical properties, and will not corrode the battery cells and other module materials, thus better protecting the TOPCon battery.

[0107] The back of the TOPCon battery has an ultra-thin tunneling silicon oxide layer and a doped polycrystalline silicon layer. If the diffusion temperature is uneven or the coating thickness is uneven, the passivation layer and barrier layer on the battery surface may have defects, thereby reducing its resistance to water and oxygen.

[0108] The fiberglass frame is mainly designed to enhance the impact resistance of the sides and corners. The battery is embedded in the middle of the fiberglass frame, and the fiberglass frame and battery are kept at a distance of more than 3mm. At the same time, handles are designed at both ends of the frame for easy installation of the casing and for easy carrying.

[0109] The second transparent PET is a reinforced PET, used on the back of the battery to provide the product with a certain strength and toughness; at the same time, it does not affect the power generation efficiency on the front. The thickness is 0.58±0.5mm, the light transmittance is greater than 86%, and the size overlaps with the product frame and cannot exceed the outer frame.

[0110] The overall structure of the product is as follows: Figure 2 and Figure 3 As shown:

[0111] The hollow structure 21028 of the handle frame is used to install the shell handle, which makes it convenient for the W-type photovoltaic module 2 to be folded and stored, as well as carried and transported by hand.

[0112] The connecting film 2106 is connected between the two battery support frames 210. It is a bendable film composed of an adhesive film and a weather-resistant film, thereby enabling the photovoltaic module 2 to expand and contract.

[0113] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that 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 any one embodiment or example.

[0114] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a battery sheet layer; a first support layer arranged on one side of the battery sheet layer; a first isolation layer arranged on the side of the first support layer away from the battery sheet layer; a first POE adhesive layer arranged between the battery sheet layer and the first support layer; a first EVA adhesive layer arranged between the first isolation layer and the first support layer.

2. The photovoltaic module according to claim 1, wherein: the battery sheet layer comprises a TOPCon cell layer; and / or the first isolation layer comprises a PVDF layer and / or an ETFE layer.

3. The photovoltaic module according to claim 1, wherein: the thickness of the first POE adhesive layer is greater than or equal to 0.45 mm and less than or equal to 0.55 mm; and / or the mass per square meter of the first POE adhesive layer is greater than or equal to 390 g and less than or equal to 450 g.

4. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises: a second support layer arranged on the side of the battery sheet layer away from the first support layer; a second isolation layer arranged on the side of the second support layer away from the battery sheet layer; a second POE adhesive layer arranged between the battery sheet layer and the second support layer; a second EVA adhesive layer arranged between the second isolation layer and the second support layer.

5. The photovoltaic module according to claim 1, wherein: the thickness of the first EVA adhesive layer is greater than or equal to 0.4 mm and less than or equal to 0.5 mm; and / or the mass per square meter of the first EVA adhesive layer is greater than or equal to 360 g and less than or equal to 420 g; and / or the first support layer comprises a PET layer; and / or the number of layers of the first support layer is greater than or equal to 2 layers; and / or the transparency of the first support layer is greater than or equal to 90%; and / or the thickness of the first support layer is greater than or equal to 0.25 mm and less than or equal to 0.35 mm; and / or the total thickness of the first support layer, the first POE adhesive layer and the first EVA adhesive layer is greater than or equal to 1 mm and less than or equal to 2 mm; and / or the total thickness of the photovoltaic module is greater than or equal to 4.5 mm and less than or equal to 5.5 mm.

6. The photovoltaic module of claim 1, wherein, The battery sheet layer comprises a plurality of polycrystalline silicon cells arranged at intervals, and the photovoltaic module further comprises: a plurality of cell support frames, one of which is arranged around the outer side of each polycrystalline silicon cell.

7. The photovoltaic module according to claim 6, wherein: the cell support frame comprises a glass fiber frame; and / or the gap between the polycrystalline silicon cell and the cell support frame is greater than or equal to 3 mm.

8. The photovoltaic module of claim 6, wherein, The plurality of cell support frames comprises a first cell frame at both ends and a second cell frame between the two first cell frames, and the first cell frame is provided with a hollow structure.

9. The photovoltaic module of claim 8, wherein, The first cell frame comprises at least one enclosing plate and a handle plate, the handle plate and at least one enclosing plate form an installation space, the polycrystalline silicon cell is arranged in the installation space, the handle plate comprises a glass fiber mesh-epoxy resin composite plate, and the enclosing plate comprises a polyester glass fiber plate.

10. The photovoltaic module according to claim 6, wherein: a gap between any adjacent battery support frames is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; and / or a number of the poly crystalline silicon cells is greater than or equal to 3 and less than or equal to 5.

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