Electrical insulation light photovoltaic module

Abstract

The invention provides an electrical insulation light photovoltaic module, and belongs to the technical field of photovoltaic modules, the electrical insulation light photovoltaic module comprises a first weather-resistant film layer, a first polyimide layer, a first glass fiber prepreg layer, a battery piece, a second glass fiber prepreg layer, a second polyimide layer and a second weather-resistant film layer which are stacked in sequence; the dielectric strength of the first polyimide layer and the dielectric strength of the second polyimide layer are both larger than or equal to 150 kV / mm. Gradient sealing structures are arranged on the periphery of the electrically-insulated light photovoltaic module. The photovoltaic module provided by the invention has relatively good electrical insulating property and can still run stably in a high-voltage environment.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic module technology, and relates to an electrically insulating lightweight photovoltaic module, specifically a lightweight photovoltaic module with electrical insulation stability under high voltage environment. Background Technology

[0002] With the rapid development of photovoltaic technology, lightweight photovoltaic modules have attracted widespread attention due to their light weight, flexible installation, and applicability to diverse scenarios (such as rooftops, car roofs, and agricultural greenhouses). However, in high-voltage environments (such as high altitude, high humidity, high salt spray, or strong electric field interference scenarios), traditional lightweight photovoltaic modules often face the problem of insufficient electrical insulation performance, which can easily lead to leakage current, arc discharge, or even insulation failure, seriously affecting the safety and long-term reliability of the modules.

[0003] Currently, most lightweight photovoltaic modules on the market use polymer-based backsheets or thin-film materials to reduce weight, but their insulation performance often fails to meet the requirements of high-voltage environments. For example, conventional materials such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET) are prone to aging, breakdown, or a decrease in insulation resistance under high temperature, high humidity, or high voltage conditions. Furthermore, lightweight designs may lead to reduced internal structural strength of the module, further exacerbating the risk of mechanical damage to the insulation materials.

[0004] Therefore, in this field, there is a desire to develop a photovoltaic module that has good electrical insulation stability under high voltage conditions and is lightweight. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide an electrically insulating lightweight photovoltaic module, specifically a lightweight photovoltaic module with electrical insulation stability under high voltage environment.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an electrically insulating lightweight photovoltaic module, the electrically insulating lightweight photovoltaic module comprising a first weather-resistant thin film layer, a first polyimide (PI) layer, a first glass fiber prepreg layer, a solar cell, a second glass fiber prepreg layer, a second polyimide layer, and a second weather-resistant thin film layer stacked sequentially.

[0008] The dielectric strength of both the first polyimide layer and the second polyimide layer is ≥150kV / mm, for example, 150kV / mm, 155kV / mm, 160kV / mm, 165kV / mm, 170kV / mm, 175kV / mm, 180kV / mm, 185kV / mm, 190kV / mm, 195kV / mm, 200kV / mm, 210kV / mm, etc.

[0009] The electrically insulated lightweight photovoltaic module is surrounded by a gradient sealing structure.

[0010] The photovoltaic module provided by this invention, on the one hand, limits the materials of each layer and stacks them in a certain order, especially by introducing a specific type of polyimide layer; on the other hand, it sets a gradient sealing structure around the photovoltaic module to prevent electric field concentration, thus giving the photovoltaic module good electrical insulation and enabling stable operation under high voltage conditions. In other words, this invention solves the contradiction between lightweight photovoltaic modules and high-voltage insulation through synergistic innovation in materials and structure. Furthermore, the gradient sealing structure also prevents moisture from entering the module.

[0011] Preferably, the dielectric strength of each of the first and second weather-resistant thin film layers is independently ≥20kV / mm, for example, 20kV / mm, 21kV / mm, 22kV / mm, 23kV / mm, 24kV / mm, 25kV / mm, 26kV / mm, 27kV / mm, 28kV / mm, 29kV / mm, 30kV / mm, 40kV / mm, 50kV / mm, etc. By limiting the dielectric strength of each of the first and second weather-resistant thin film layers to ≥20kV / mm, the electrical insulation of the photovoltaic module can be further improved.

[0012] Preferably, the thickness of the first weather-resistant film layer and the second weather-resistant film layer is independently 80-150μm, such as 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, etc., and preferably 100μm.

[0013] Preferably, both the first weather-resistant film layer and the second weather-resistant film layer are polyvinyl fluoride composite film (TPT) layers. TPT is a polyvinyl fluoride composite film with a sandwich-type interlayer structure of PVF (polyvinyl fluoride) + PET (polyethylene terephthalate) + PVF.

[0014] Preferably, the thickness of the first polyimide layer and the second polyimide layer is independently 25-75 μm, such as 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, etc., and preferably 50 μm.

[0015] Preferably, the transmittance of the first polyimide layer and the second polyimide layer is independently ≥85%, for example 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc.

[0016] The first polyimide layer and the second polyimide layer provided by the present invention both have high temperature resistance and good insulation properties.

[0017] Preferably, the thickness of the first glass fiber prepreg layer and the second glass fiber prepreg layer is independently 0.1-0.4 mm, for example 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, etc.

[0018] Preferably, the dielectric strength of the first and second glass fiber prepreg layers is independently ≥20kV / mm, such as 20kV / mm, 21kV / mm, 22kV / mm, 23kV / mm, 24kV / mm, 25kV / mm, 26kV / mm, 27kV / mm, 28kV / mm, 29kV / mm, 30kV / mm, etc., and more preferably 20-30kV / mm. By further limiting the dielectric strength of the first and second glass fiber prepreg layers to not less than 20kV / mm, the electrical insulation of the photovoltaic module can be further improved.

[0019] Preferably, the solar cell is any one of IBC solar cell, PERC solar cell, or TOPcon solar cell.

[0020] Preferably, an adhesive film layer is disposed between each adjacent layer of the electrically insulating lightweight photovoltaic module. That is, the electrically insulating lightweight photovoltaic module includes a first weather-resistant thin film layer, a first adhesive film layer, a first polyimide layer, a second adhesive film layer, a first glass fiber prepreg layer, a third adhesive film layer, a solar cell, a fourth adhesive film layer, a second glass fiber prepreg layer, a fifth adhesive film layer, a second polyimide layer, a sixth adhesive film layer, and a second weather-resistant thin film layer, stacked sequentially.

[0021] Preferably, the first to sixth adhesive film layers are all POE (polyolefin elastomer) adhesive film layers. Compared to other adhesive films, the present invention uses POE as the adhesive film layer, which can further improve the electrical insulation of the photovoltaic module.

[0022] Preferably, the thickness of each of the first to sixth adhesive film layers is independently 0.3-0.6 mm, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, etc.

[0023] Preferably, the gradient sealing structure includes a butyl rubber layer and a silicone rubber layer stacked sequentially from the inside to the outside.

[0024] Preferably, the thickness of the butyl rubber layer is 0.2-0.5 mm, such as 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. The butyl rubber layer serves to block moisture.

[0025] The present invention does not specifically limit the butyl rubber in the butyl rubber layer, which can be purchased or prepared according to conventional methods of the prior art. For example, the butyl rubber includes the following components by weight:

[0026]

[0027] The antioxidant may be, for example, a phenolic antioxidant such as 1010.

[0028] Preferably, the thickness of the silicone layer is 1-1.5 mm, such as 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. The silicone layer acts as an elastic buffer to prevent cracking due to mechanical stress.

[0029] The present invention does not specifically limit the silicone material of the silicone layer, which can be purchased or prepared according to conventional methods of the prior art. For example, the silicone material comprises the following components by weight:

[0030]

[0031]

[0032] Preferably, a junction box is also provided on the front side of the electrically insulated lightweight photovoltaic module. In this invention, the front side of the electrically insulated lightweight photovoltaic module refers to the side facing the front of the solar cells.

[0033] As a preferred embodiment of the present invention, the junction box is disposed at the center of the front edge of the electrically insulated lightweight photovoltaic module.

[0034] Preferably, a busbar extends from the front of the battery cell, and the other end of the busbar is connected to the junction box. Gaps between the busbar and the junction box can be sealed with potting compound. The busbar is typically welded to the corresponding area of ​​the junction box, and the weld joints can be covered with insulating adhesive. Waterproof connectors can be used for the cable joints inside the junction box.

[0035] The present invention does not specifically limit the preparation method of the electrically insulating lightweight photovoltaic module, which can be prepared by referring to conventional preparation methods in the prior art. Exemplarily, the preparation method of the electrically insulating lightweight photovoltaic module includes the following steps:

[0036] (1) Stack the cut first weather-resistant film layer, first adhesive film layer, first polyimide layer, second adhesive film layer, first glass fiber prepreg layer, third adhesive film layer, battery cell, fourth adhesive film layer, second glass fiber prepreg layer, fifth adhesive film layer, second polyimide layer, sixth adhesive film layer, and second weather-resistant film layer in sequence.

[0037] (2) Place it in a laminator and laminate it under vacuum at 140℃-160℃ for 20-30 minutes;

[0038] (3) Use a high-frequency vibrating knife or laser cutting to remove excess adhesive from the edges;

[0039] (4) Using a precision dispensing machine or scraping equipment, apply butyl rubber evenly to the inner edge of the component with a thickness of 0.3±0.05mm, focusing on covering the electrode lead-out end and junction box interface area to form a continuous and unbroken sealing ring.

[0040] (5) Use a two-component dispensing machine (A:B = 10:1) to cover the outer layer of butyl rubber and the exposed parts of the component edges with silicone, with a thickness of 1.2 ± 0.1 mm.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The photovoltaic module provided by this invention, on the one hand, limits the materials of each layer and stacks them in a certain order, especially by introducing a specific type of polyimide layer; on the other hand, it sets a gradient sealing structure around the photovoltaic module to prevent electric field concentration, thus giving the photovoltaic module good electrical insulation and enabling stable operation under high voltage conditions. In other words, this invention solves the contradiction between lightweight photovoltaic modules and high-voltage insulation through synergistic innovation in materials and structure. Furthermore, the gradient sealing structure also prevents moisture from entering the module. Attached Figure Description

[0043] Figure 1 This is a partial structural schematic diagram of the electrically insulated lightweight photovoltaic module provided in Example 1;

[0044] Among them, 1-first weather-resistant film layer, 2-first adhesive film layer, 3-first polyimide layer, 4-second adhesive film layer, 5-first glass fiber prepreg layer, 6-third adhesive film layer, 7-battery cell, 8-fourth adhesive film layer, 9-second glass fiber prepreg layer, 10-fifth adhesive film layer, 11-second polyimide layer, 12-sixth adhesive film layer, 13-second weather-resistant film layer, 14-butyl rubber layer, and 15-silicone layer.

[0045] Figure 2 This is a schematic diagram showing the positional relationship between the junction box and the electrically insulated lightweight photovoltaic module in Example 1;

[0046] Among them, 01-electrically insulated lightweight photovoltaic module, 02-junction box. Detailed Implementation

[0047] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0048] Example 1

[0049] This embodiment provides an electrically insulated lightweight photovoltaic module, and a partial structural schematic diagram is shown below. Figure 1 As shown, the electrically insulating lightweight photovoltaic module includes a first weather-resistant thin film layer 1, a first adhesive film layer 2, a first polyimide layer 3, a second adhesive film layer 4, a first glass fiber prepreg layer 5, a third adhesive film layer 6, a solar cell 7, a fourth adhesive film layer 8, a second glass fiber prepreg layer 9, a fifth adhesive film layer 10, a second polyimide layer 11, a sixth adhesive film layer 12, and a second weather-resistant thin film layer 13, which are stacked sequentially.

[0050] The electrically insulated lightweight photovoltaic module is provided with a gradient sealing structure around its perimeter.

[0051] Among them, the first weather-resistant thin film layer 1 and the second weather-resistant thin film layer 13 are both TPT layers with a thickness of 100μm and a dielectric strength of 25kV / mm.

[0052] The thickness of the first polyimide layer 3 and the second polyimide layer 11 are both 50 μm, the dielectric strength is both 150 kV / mm, and the transmittance is both 90%.

[0053] The thickness of the first glass fiber prepreg layer 5 and the second glass fiber prepreg layer 9 are both 0.3 mm, and the dielectric strength is 25 kV / mm.

[0054] Cell 7 is an IBC cell;

[0055] The first to sixth adhesive layers are all POE adhesive layers, each with a thickness of 0.45 mm;

[0056] The gradient sealing structure includes a butyl rubber layer 14 and a silicone rubber layer 15 stacked sequentially from the inside to the outside, wherein the thickness of the butyl rubber layer 14 is 0.3 mm and the thickness of the silicone rubber layer 15 is 1.2 mm.

[0057] The raw materials for preparing the butyl rubber layer 14, by weight, include the following components:

[0058]

[0059] Among them, the grade of butyl rubber is BK-1675N, the grade of polyisobutylene is PB1300, the antioxidant is antioxidant 1010, and the crosslinking agent is BIBP-96.

[0060] The raw materials for preparing the silicone layer 15, by weight, include the following components:

[0061]

[0062] Among them, the grade of methyl vinyl silicone rubber is 110 raw rubber, the grade of silicone oil is PMX-200 silicone oil, the crosslinking agent is Dow Corning Z-6030, and the ultraviolet absorber is UV-327.

[0063] A junction box is also provided at the center of the front edge of the electrically insulated lightweight photovoltaic module (wherein, the positional relationship between the junction box and the electrically insulated lightweight photovoltaic module is shown in the schematic diagram). Figure 2 As shown), a busbar extends from the front of the battery cell, and the other end of the busbar is connected to the junction box. The gap between the busbar and the external junction box is sealed with butyl rubber (the formula is the same as that of the butyl rubber layer 14 above). The busbar is welded to the corresponding area of ​​the junction box by welding, and the welding point is covered with insulating glue (Lidin LD2070). The cable connector inside the junction box is a waterproof connector.

[0064] The preparation method includes the following steps:

[0065] (1) Stack the cut first weather-resistant film layer, first adhesive film layer, first polyimide layer, second adhesive film layer, first glass fiber prepreg layer, third adhesive film layer, battery cell, fourth adhesive film layer, second glass fiber prepreg layer, fifth adhesive film layer, second polyimide layer, sixth adhesive film layer, and second weather-resistant film layer in sequence.

[0066] (2) Place it in a laminator and laminate it at 150°C under vacuum for 25 minutes;

[0067] (3) Use a high-frequency vibrating knife or laser cutting to remove excess adhesive from the edges;

[0068] (4) Using a precision dispensing machine or scraping equipment, apply butyl rubber evenly to the inner edge of the component with a thickness of 0.3mm, focusing on covering the electrode lead-out end and junction box interface area to form a continuous and unbroken sealing ring.

[0069] (5) Use a two-component dispensing machine (A:B = 10:1) to cover the outer layer of butyl rubber and the exposed parts of the component edges with silicone, with a thickness of 1.2mm.

[0070] Example 2

[0071] This embodiment provides an electrically insulating lightweight photovoltaic module, which includes a first weather-resistant thin film layer, a first adhesive film layer, a first polyimide layer, a second adhesive film layer, a first glass fiber prepreg layer, a third adhesive film layer, a solar cell, a fourth adhesive film layer, a second glass fiber prepreg layer, a fifth adhesive film layer, a second polyimide layer, a sixth adhesive film layer, and a second weather-resistant thin film layer, stacked sequentially.

[0072] The electrically insulated lightweight photovoltaic module is provided with a gradient sealing structure around its perimeter.

[0073] The first and second weather-resistant thin film layers are both TPT layers with a thickness of 80 μm and a dielectric strength of 20 kV / mm.

[0074] The thickness of both the first and second polyimide layers is 25 μm, the dielectric strength is 150 kV / mm, and the transmittance is 85%.

[0075] The thickness of both the first and second glass fiber prepreg layers is 0.1 mm, and the dielectric strength of both is 20 kV / mm.

[0076] The solar cells are IBC solar cells;

[0077] The first to sixth adhesive layers are all POE adhesive layers, each with a thickness of 0.3 mm;

[0078] The gradient sealing structure includes a butyl rubber layer and a silicone rubber layer stacked sequentially from the inside to the outside, wherein the thickness of the butyl rubber layer is 0.2 mm and the thickness of the silicone rubber layer is 1 mm.

[0079] The raw materials for preparing the butyl rubber layer and silicone rubber layer, the arrangement of the junction box and busbar, and the preparation method of the photovoltaic module are the same as in Example 1.

[0080] Example 3

[0081] This embodiment provides an electrically insulating lightweight photovoltaic module, which includes a first weather-resistant thin film layer, a first adhesive film layer, a first polyimide layer, a second adhesive film layer, a first glass fiber prepreg layer, a third adhesive film layer, a solar cell, a fourth adhesive film layer, a second glass fiber prepreg layer, a fifth adhesive film layer, a second polyimide layer, a sixth adhesive film layer, and a second weather-resistant thin film layer, stacked sequentially.

[0082] The electrically insulated lightweight photovoltaic module is provided with a gradient sealing structure around its perimeter.

[0083] The first and second weather-resistant thin film layers are both TPT layers with a thickness of 150 μm and a dielectric strength of 30 kV / mm.

[0084] The thickness of both the first and second polyimide layers is 75 μm, the dielectric strength is 150 kV / mm, and the transmittance is 85%.

[0085] The thickness of both the first and second glass fiber prepreg layers is 0.4 mm, and the dielectric strength of both is 30 kV / mm.

[0086] The solar cells are IBC solar cells;

[0087] The first to sixth adhesive layers are all POE adhesive layers, each with a thickness of 0.6 mm;

[0088] The gradient sealing structure includes a butyl rubber layer and a silicone rubber layer stacked sequentially from the inside to the outside, wherein the thickness of the butyl rubber layer is 0.5 mm and the thickness of the silicone rubber layer is 1.5 mm.

[0089] The raw materials for preparing the butyl rubber layer and silicone rubber layer, the arrangement of the junction box and busbar, and the preparation method of the photovoltaic module are the same as in Example 1.

[0090] Example 4

[0091] The only difference between this embodiment and Embodiment 1 is that both the first and second weather-resistant thin film layers are TPT layers, both with a thickness of 100 μm and a dielectric strength of 15 kV / mm.

[0092] Example 5

[0093] The only difference between this embodiment and Embodiment 1 is that the dielectric strength of both the first and second glass fiber prepreg layers is 15kV / mm.

[0094] Example 6

[0095] The only difference between this embodiment and Embodiment 1 is that the first to sixth adhesive film layers are all EVA adhesive film layers with a thickness of 0.45 mm.

[0096] Example 7

[0097] The only difference between this embodiment and Embodiment 1 is that the electrically insulating lightweight photovoltaic module is surrounded by a butyl rubber layer, the thickness of which and the raw materials used in its preparation are the same as in Embodiment 1.

[0098] Example 8

[0099] The only difference between this embodiment and Embodiment 1 is that the electrically insulating lightweight photovoltaic module is surrounded by a silicone layer, the thickness of which and the raw materials used in its preparation are the same as in Embodiment 1.

[0100] Comparative Example 1

[0101] The only difference between this comparative example and Example 1 is that the thickness of the first polyimide layer and the second polyimide layer are both 50 μm, the dielectric strength is both 75 kV / mm, and the transmittance is both 85%.

[0102] Comparative Example 2

[0103] The only difference between this comparative example and Example 1 is that the electrically insulated lightweight photovoltaic module is sealed with an aluminum frame around its perimeter.

[0104] Comparative Example 3

[0105] The only difference between this comparative example and Example 1 is that the electrically insulating lightweight photovoltaic module is encapsulated around its perimeter with a POE film (0.45 mm thick).

[0106] The photovoltaic modules provided in the embodiments and comparative examples of the present invention were subjected to performance tests, and the test methods are as follows:

[0107] (1) Insulation resistance: Bending fatigue test was conducted according to the IEC62782 test standard. The cycle was 1000 times when the radius of curvature was 0.5m. The standard is: the insulation resistance of the component is >100 megohms and there is no breakdown.

[0108] (2) Leakage current: Step voltage boost test: increase the voltage to 2.5 times the system voltage (e.g., 1500V-3750V) in 250V / step, and pause for 1 minute at each step. Standard: leakage current <50 microamps;

[0109] (3) Component strength test (drop ball test): According to IEC 63163 standard, the power attenuation of the component is tested before and after the drop ball test, and the standard is <5%.

[0110] The performance test results are shown in Table 1.

[0111] Table 1

[0112]

[0113] As can be seen from Table 1, the photovoltaic modules provided in the embodiments of the present invention all have good electrical insulation (insulation resistance: 105~600MΩ), and the power attenuation can meet the requirements.

[0114] Compared with Example 1, the electrical insulation of the photovoltaic modules provided in Comparative Examples 1-3 has been significantly reduced.

[0115] The applicant declares that the present invention is illustrated by the above embodiments to describe the electrically insulated lightweight photovoltaic module of the present invention, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, additions of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An electrically insulated lightweight photovoltaic module, characterized in that, The electrically insulating lightweight photovoltaic module comprises a first weather-resistant thin film layer, a first polyimide layer, a first glass fiber prepreg layer, a solar cell, a second glass fiber prepreg layer, a second polyimide layer, and a second weather-resistant thin film layer, which are stacked sequentially. The dielectric strength of both the first polyimide layer and the second polyimide layer is ≥150kV / mm; The electrically insulated lightweight photovoltaic module is surrounded by a gradient sealing structure.

2. The electrically insulated lightweight photovoltaic module according to claim 1, characterized in that, The dielectric strength of the first weather-resistant thin film layer and the second weather-resistant thin film layer is independently ≥20kV / mm; Preferably, the thickness of the first weather-resistant film layer and the second weather-resistant film layer are each independently 80-150 μm; Preferably, both the first weather-resistant film layer and the second weather-resistant film layer are polyvinyl fluoride composite film layers.

3. The electrically insulated lightweight photovoltaic module according to claim 1 or 2, characterized in that, The thickness of the first polyimide layer and the second polyimide layer are each independently 25-75 μm; Preferably, the transmittance of the first polyimide layer and the second polyimide layer is each ≥85% independently.

4. The electrically insulated lightweight photovoltaic module according to any one of claims 1-3, characterized in that, The thickness of the first glass fiber prepreg layer and the second glass fiber prepreg layer are each independently 0.1-0.4 mm; Preferably, the dielectric strength of the first glass fiber prepreg layer and the second glass fiber prepreg layer is ≥20kV / mm, and more preferably 20-30kV / mm.

5. The electrically insulated lightweight photovoltaic module according to any one of claims 1-4, characterized in that, The solar cell is any one of IBC solar cells, PERC solar cells, or TOPcon solar cells.

6. The electrically insulated lightweight photovoltaic module according to any one of claims 1-5, characterized in that, The electrically insulating lightweight photovoltaic module has an adhesive film layer between each adjacent layer. That is, the electrically insulating lightweight photovoltaic module includes a first weather-resistant film layer, a first adhesive film layer, a first polyimide layer, a second adhesive film layer, a first glass fiber prepreg layer, a third adhesive film layer, a solar cell, a fourth adhesive film layer, a second glass fiber prepreg layer, a fifth adhesive film layer, a second polyimide layer, a sixth adhesive film layer, and a second weather-resistant film layer, which are stacked in sequence.

7. The electrically insulated lightweight photovoltaic module according to claim 6, characterized in that, The first to sixth adhesive film layers are all POE adhesive film layers; Preferably, the thickness of each of the first to sixth adhesive film layers is 0.3-0.6 mm.

8. The electrically insulated lightweight photovoltaic module according to any one of claims 1-7, characterized in that, The gradient sealing structure includes a butyl rubber layer and a silicone rubber layer stacked sequentially from the inside to the outside.

9. The electrically insulated lightweight photovoltaic module according to claim 8, characterized in that, The thickness of the butyl rubber layer is 0.2-0.5 mm; Preferably, the thickness of the silicone layer is 1-1.5 mm.

10. The electrically insulated lightweight photovoltaic module according to any one of claims 1-9, characterized in that, The front side of the electrically insulated lightweight photovoltaic module is also provided with a junction box; Preferably, a busbar extends from the front of the battery cell, and the other end of the busbar is connected to the junction box.

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