Protective film for back glass of photovoltaic module and photovoltaic module

Abstract

The utility model belongs to the technical field of photovoltaic modules, and particularly relates to a protective film for back glass of a photovoltaic module and the photovoltaic module. The protective film comprises a first insulating transparent film and a second insulating transparent film, the first insulating transparent film is arranged on the back glass of the photovoltaic module and extends in the length direction corresponding to the left side and the right side of the junction box, and viscous support and surface protection can be provided for the back glass; the second insulating transparent film is connected with the first insulating transparent films located on the left and right sides of the junction box and covers the area between the junction boxes or between the junction boxes and the photovoltaic module frame, so that the stability of the whole structure is enhanced, and the stress balance range is further expanded. By arranging the protective film, the probability of damage or continuous damage of the back glass of the photovoltaic module caused by external or self stress can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of photovoltaic modules, and particularly relates to a protective film for back glass of a photovoltaic module and a photovoltaic module. BACKGROUND

[0002] In the application of photovoltaic modules, glass serves as an encapsulation material, providing good barrier to moisture penetration and mechanical strength. However, the back glass of a double-glass photovoltaic module may have uneven stress distribution after the glazing and hole opening processes. This uneven stress distribution makes the back glass more prone to breakage when subjected to external mechanical stress or thermal stress. In addition, during the installation process of the photovoltaic module, the difference in the four corner torques may also increase the risk of glass breakage. Although the broken photovoltaic module may continue to maintain its original power output in the short term, the ingress of moisture at the crack may lead to performance degradation in the long term. The ingress of moisture may not only corrode the encapsulation material, but also cause short circuits of the live parts, increasing the electrical safety risk. SUMMARY

[0003] One of the purposes of the present application is to provide a protective film for the back glass of a photovoltaic module, wherein one of the first insulating transparent film and the second insulating transparent film in the protective film provides adhesive support and surface protection for the back glass, thereby effectively reducing the probability of breakage or continued breakage of the back glass of the photovoltaic module due to external or self stress.

[0004] Another purpose of the present application is to provide a photovoltaic module comprising a protective film for the back glass of the photovoltaic module.

[0005] According to an embodiment of the present application, a first aspect provides a protective film for the back glass of a photovoltaic module, the protective film comprising:

[0006] a first insulating transparent film disposed on the back glass of the photovoltaic module, the first insulating transparent film corresponding to the left and right sides of a junction box of the photovoltaic module and extending along the length direction of the photovoltaic module, respectively;

[0007] a second insulating transparent film disposed on the back glass of the photovoltaic module, the second insulating transparent film connecting the first insulating transparent films on the left and right sides of the junction box and corresponding to the space between adjacent two junction boxes or / and the space between the junction box and the frame of the photovoltaic module.

[0008] In an embodiment, the width of the single-side edge of the second insulating transparent film covering the first insulating transparent film is not less than 0.5 cm.

[0009] In an embodiment, the first insulating transparent film has a thickness ranging from 200 μm to 350 μm; and / or, the second insulating transparent film has a thickness ranging from 200 μm to 350 μm.

[0010] In an embodiment, the length of the first insulating transparent film does not exceed the vertical distance between the end of the first insulating transparent film close to the junction box and the silicone layer at the width edge of the photovoltaic module, and the width of the first insulating transparent film does not exceed the vertical distance of the silicone layer at the length edge of the photovoltaic module.

[0011] In an embodiment, the length of the second insulating transparent film does not exceed the vertical distance between the outer edge silicone of the adjacent two junction boxes or / and does not exceed the vertical distance between the outer edge silicone of the junction box and the silicone close to the length edge of the photovoltaic module.

[0012] In an embodiment, the number of the second insulating transparent film is greater than the number of the junction box.

[0013] In an embodiment, the number of the second insulating transparent film is one more than the number of the junction box.

[0014] In an embodiment, the first insulating transparent film comprises a transparent film body layer and a transparent pressure sensitive adhesive layer, and the second insulating transparent film has the same composition as the first insulating transparent film.

[0015] In an embodiment, the transparent film body layer comprises a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on one side, a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on both sides, a polyethylene terephthalate substrate with adhesive and organic fluorine film on one side, or a polyethylene terephthalate substrate with adhesive and organic fluorine film on both sides, and / or the transparent pressure sensitive adhesive layer is an olefin polymer matrix pressure sensitive adhesive or a rubber matrix pressure sensitive adhesive.

[0016] According to the embodiments of the present application, a second aspect provides a photovoltaic module comprising the protective film of the back glass of the photovoltaic module.

[0017] The protective film of the present application comprises a first insulating transparent film and a second insulating transparent film. The first insulating transparent film is arranged on the back glass of the photovoltaic module and extends along the length direction on both sides of the junction box, which can provide adhesive support and surface protection for the back glass. The second insulating transparent film connects the first insulating transparent films on both sides of the junction box and covers the area between the junction boxes or between the junction box and the frame of the photovoltaic module, which not only enhances the stability of the overall structure, but also further expands the range of stress balance. By arranging the protective film, the probability of damage or continued damage of the back glass of the photovoltaic module due to external or self stress is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 a schematic view of a protective film in an embodiment of the present application;

[0019] Figure 2 a schematic view of a structure of a photovoltaic module in an embodiment of the present application;

[0020] Figure 3 a schematic view of a photovoltaic module with a protective film in an embodiment of the present application;

[0021] Figure 4 a schematic view of a first insulating transparent film.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 100, first insulating transparent film; 110, transparent film main body layer; 120, transparent pressure-sensitive adhesive layer;

[0024] 200, second insulating transparent film;

[0025] 300, photovoltaic module; 310, back glass; 320, junction box. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0027] It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the present application.

[0028] The structures, proportions, sizes, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the present specification, so that those skilled in the art can understand and read, and are not intended to limit the implementation conditions of the present application. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the functions and purposes of the present application, should still fall within the scope of the technical content disclosed by the present application.

[0029] Terms such as "upper," "lower," "left," "right," "center," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification to indicate positions or locations are based on those shown in the accompanying drawings and are intended solely for ease of description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] As mentioned in the background, in photovoltaic module applications, glass, as an encapsulation material, provides excellent barrier properties against water vapor penetration and mechanical strength. However, after glazing and perforation, the back glass of double-glass photovoltaic modules may experience uneven stress distribution. This uneven stress distribution makes the back glass more susceptible to breakage when subjected to external mechanical or thermal stress. Furthermore, during the installation of photovoltaic modules, differences in the four corner moments may increase the risk of glass breakage. Although a broken photovoltaic module may continue to maintain its original power output in the short term, in the long term, water vapor intrusion at the cracks may cause performance degradation. Water vapor intrusion may not only corrode the encapsulation material but also cause short circuits in live components, increasing electrical safety risks. To better address this issue, the researchers in this application propose a protective film for the back glass of photovoltaic modules. By applying a first insulating transparent film and a second insulating transparent film to the back glass, the film provides adhesive support and surface protection, effectively reducing the probability of breakage or further breakage of the back glass of the photovoltaic module.

[0031] like Figure 1 As shown, Figure 1 Figure 1 is a schematic diagram of a protective film in one embodiment of the present application. The protective film for the back glass 310 of a photovoltaic module 300 in this embodiment includes a first insulating transparent film 100 and a second insulating transparent film 200. In this embodiment, researchers intend to use the first insulating transparent film 100 and the second insulating transparent film 200 to provide adhesive support and surface protection for the back glass 310, thereby effectively reducing the probability of damage or continued damage to the back glass 310 of the photovoltaic module 300 due to external or internal stress.

[0032] For details, see Figures 1 to 3 As shown, the first insulating transparent film 100 is disposed on the back glass 310 of the photovoltaic module 300. The first insulating transparent film 100 corresponds to the left and right sides of the junction box 320 of the photovoltaic module 300 and extends along the length direction of the photovoltaic module 300. The length direction of the photovoltaic module 300 can be referred to as Figure 3The second insulating transparent film 200 is arranged on the back glass 310 of the photovoltaic module 300, and is connected to the first insulating transparent film 100 on the left and right sides of the junction box 320, and covers the area between the adjacent two junction boxes 320 or / and between the junction box 320 and the frame of the photovoltaic module 300.

[0033] In this embodiment, the first insulating transparent film 100 is arranged on the back glass 310 of the photovoltaic module 300, and extends along the length direction corresponding to the left and right sides of the junction box 320, which can provide viscous support and surface protection for the back glass 310; the second insulating transparent film 200 is connected to the first insulating transparent film 100 on the left and right sides of the junction box 320, and covers the area between the adjacent two junction boxes 320 or / and between the junction box 320 and the frame of the photovoltaic module 300, which not only enhances the stability of the overall structure, but also further expands the range of stress distribution. By arranging the protective film, the probability of damage or continued damage of the back glass 310 of the photovoltaic module 300 due to external or self stress is effectively reduced.

[0034] In addition, the insulating function of the first insulating transparent film 100 and the second insulating transparent film 200 can solve the electrical safety problem of the photovoltaic module 300 exposed to the external environment for a long time. The reason is that the photovoltaic module 300 contains conductive materials, especially in the junction box 320 and adjacent parts, which are at risk of electrical short circuit. By covering the insulating material in these areas, electrical short circuit or leakage caused by water vapor intrusion can be avoided, thereby significantly improving the electrical safety of the photovoltaic module 300.

[0035] The transparent performance of the first insulating transparent film 100 and the second insulating transparent film 200 ensures that the energy output efficiency of the photovoltaic module 300 is not affected. The reason is that the working principle of the photovoltaic module 300 depends on the light passing through the back glass 310, and any shielding or opaque material will reduce the light receiving ability of the module, thereby reducing the electrical energy output. By using transparent insulating film, mechanical protection and electrical insulation can be provided while ensuring that the back glass 310 can continue to let light pass through.

[0036] In an embodiment, the single-side edge of the second insulating transparent film 200 covers the first insulating transparent film 100 with a width of not less than 0.5 cm.

[0037] In the present embodiment, the single-side edge of the second insulating transparent film 200 is covered on the first insulating transparent film 100 with a width of no less than 0.5 cm, which ensures the close combination between the two films. Specifically, by covering the single-side edge of the second insulating transparent film 200 on the first insulating transparent film 100 with a width of at least 0.5 cm, the moisture and dust from the edge between the two films can be effectively prevented from penetrating, thereby enhancing the protection of the back glass 310. In addition, this edge covering manner can also significantly improve the adhesion between the first insulating transparent film 100 and the second insulating transparent film 200, reducing the possibility of separation of the two films under external force, thereby ensuring the reliability and stability in long-term use.

[0038] In an embodiment, the thickness of the first insulating transparent film 100 ranges from 200 μm to 350 μm; and / or, the thickness of the second insulating transparent film 200 ranges from 200 μm to 350 μm.

[0039] In the present embodiment, the thickness of the first insulating transparent film 100 ranges from 200 μm to 350 μm; and / or, the thickness of the second insulating transparent film 200 ranges from 200 μm to 350 μm. This design not only meets the requirements of the photovoltaic module 300 for the creepage distance, but also takes into account the demand for light transmittance. Specifically, the thickness range of 200 μm to 350 μm is selected to ensure that the first insulating transparent film 100 and the second insulating transparent film 200 have sufficient physical thickness to achieve the necessary electrical insulation effect, prevent the creep phenomenon that may occur under adverse weather conditions, and thus ensure the safe operation of the photovoltaic module 300. At the same time, the insulating film within this thickness range maintains a high light transmittance, ensuring that the photovoltaic module 300 can effectively absorb sunlight and maintain high-efficiency energy conversion. If the first insulating transparent film 100 and the second insulating transparent film 200 are too thin, they may not provide sufficient insulation protection, while if they are too thick, they will increase the material cost and may affect the light transmittance performance, therefore the researchers prefer to set the thickness range of the first insulating transparent film 100 and the second insulating transparent film 200 to 200 μm to 350 μm.

[0040] In an embodiment, referring to Figure 3 As shown in FIG. 1, the length of the first insulating transparent film 100 ranges from the end of the first insulating transparent film 100 close to the junction box 320 to the silicone layer at the width edge of the photovoltaic module 300, and the width of the first insulating transparent film 100 ranges from the vertical distance of the silicone layer at the length edge of the photovoltaic module 300, wherein the width edge of the photovoltaic module 300 can be referred to the reference sign b in FIG. 1. Figure 3

[0041] ​In the embodiment, the length of the first insulating transparent film 100 does not exceed the vertical distance from the end of the first insulating transparent film 100 close to the junction box 320 to the silicone layer at the width edge of the photovoltaic module 300, and the width of the first insulating transparent film 100 does not exceed the vertical distance of the silicone layer at the length edge of the photovoltaic module 300. This design ensures the accurate coverage of the first insulating transparent film 100 on the back glass 310, avoids the waste of material caused by excessive extension, and at the same time guarantees the protection of the key area of the photovoltaic module 300. By limiting the length and width of the first insulating transparent film 100, the first insulating transparent film 100 can be effectively prevented from covering the unnecessary area, and the potential influence on the normal working environment of the photovoltaic module 300 is reduced.

[0042] In addition, the silicone layer as a sealing material in the photovoltaic module 300 mainly plays a role in preventing water vapor and dust from entering. If the length or width of the first insulating transparent film 100 exceeds the range of the silicone layer, it may affect the overall sealing effect of the photovoltaic module 300. The excessively extended insulating film may cause the film to not be close enough to the silicone layer, and thus small gaps may be generated due to thermal expansion and contraction or external mechanical stress during long-term use. These gaps may become channels for water vapor and dust to enter, thereby increasing the risk of corrosion inside the photovoltaic module 300. In the embodiment, by controlling the size range of the first insulating transparent film 100, the size of the first insulating transparent film 100 is matched with the range of the silicone layer in the photovoltaic module 300, which can ensure the close fit between the sealing material and the first insulating transparent film 100, and maximize the possibility of reducing the entry of external water vapor and dust.

[0043] In an embodiment, referring to FIG. 2, Figure 3 the length of the second insulating transparent film 200 does not exceed the vertical distance of the outer silicone of the two adjacent junction boxes 320 or / and does not exceed the vertical distance from the outer silicone of the junction box 320 to the outer silicone of the junction box 320 close to the silicone layer at the length edge of the photovoltaic module 300, wherein the vertical distance can refer to the distance shown at label c in FIG. 1. Figure 3

[0044] ​In the present embodiment, the researchers control the length of the second insulating transparent film 200 so that the second insulating transparent film 200 can cover the distance between the area between the two junction boxes 320 or the vertical distance between the junction box 320 and the outer edge of the junction box 320 and the silicone layer on the length edge of the photovoltaic module 300. Specifically, the over-extended second insulating transparent film 200 can cause the second insulating transparent film 200 to not be close enough to the outer edge of the junction box 320 or the silicone layer on the length edge of the photovoltaic module 300, especially under the long-term effect of thermal expansion and contraction or external mechanical stress, which can form a small gap and affect the sealing effect of the photovoltaic module 300. On the contrary, by controlling the length of the second insulating transparent film 200 within the vertical distance between the outer edge of the adjacent junction box 320 or the outer edge of the junction box 320 and the silicone layer on the length edge of the photovoltaic module 300, the second insulating transparent film 200 can be ensured to be closely attached to these key positions, thereby strengthening the sealing effect and reducing the erosion of the photovoltaic module 300 by the external environment, such as moisture and dust.

[0045] In an embodiment, the number of second insulating transparent films 200 is greater than the number of junction boxes 320.

[0046] In the present embodiment, the researchers design the number of second insulating transparent films 200 to be greater than the number of junction boxes 320, because the area between the two junction boxes 320 or the area between the junction box 320 and the outer edge of the silicone layer on the length edge of the photovoltaic module 300 is covered. Because there is usually a large gap between the two junction boxes 320 on the back of the photovoltaic module 300, and these areas are often high-risk locations for uneven stress distribution. Therefore, the researchers design the number of second insulating transparent films 200 to be greater than the number of junction boxes 320, so that the stress can be more evenly distributed, so that the back glass 310 can effectively reduce the possibility of damage when subjected to external mechanical force or thermal stress. Among them, the number of second insulating transparent films 200 can be one more than the number of junction boxes 320.

[0047] In an embodiment, referring to Figure 4 As shown in FIG. 1, the first insulating transparent film 100 includes a transparent film main layer 110 and a transparent pressure-sensitive adhesive layer 120, and the second insulating transparent film 200 has the same composition as the first insulating transparent film 100.

[0048] In this embodiment, the transparent film body layer 110 provides basic mechanical strength and electrical insulation performance, while the transparent pressure-sensitive adhesive layer 120 provides reliable adhesion between the film and the back glass 310 and other structures. Specifically, the transparent film body layer 110 can effectively protect the back glass 310 from mechanical damage in the external environment, such as scratching, impact, or external force, etc. In addition, due to the high light transmittance of the transparent film, the energy conversion efficiency of the photovoltaic module 300 will not be affected by the coverage of the film. The transparent pressure-sensitive adhesive layer 120 can ensure the close adhesion of the first and second insulating transparent films 100 and 200 to the surface of the back glass 310.

[0049] Further, in an embodiment, the transparent film body layer 110 includes a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on one side, a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on both sides, a polyethylene terephthalate substrate with adhesive and organic fluorine film on one side, or a polyethylene terephthalate substrate with adhesive and organic fluorine film on both sides; and / or the transparent pressure-sensitive adhesive layer 120 is an olefin polymer matrix pressure-sensitive adhesive or a rubber matrix pressure-sensitive adhesive.

[0050] In this embodiment, the design of the transparent film body layer 110 includes the following forms: a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on one side, a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on both sides, a polyethylene terephthalate substrate with adhesive and organic fluorine film on one side, or a polyethylene terephthalate substrate with adhesive and organic fluorine film on both sides. These different types of film body layers provide flexible protection options for the photovoltaic module 300, thereby adapting to different use requirements and environmental conditions, and maximizing the performance of the photovoltaic module 300.

[0051] Specifically, the polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on one side has good UV resistance and low surface energy, making it difficult for dust, oil stains or other contaminants to adhere to its surface. This property is crucial for photovoltaic module 300, as the accumulation of dust can reduce the photoelectric conversion efficiency of the module. By coating polytetrafluoroethylene resin, the film surface has excellent antifouling and self-cleaning ability, reducing the cost and frequency of cleaning and maintenance under long-term outdoor exposure conditions. The polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on both sides can enhance the protective effect of the first insulating transparent film 100 main layer, and resist the influence of ultraviolet radiation on both sides. In the polyethylene terephthalate substrate with adhesive and organic fluorine film composite on one side, the organic fluorine film is pasted on the polyethylene terephthalate substrate through the adhesive, thereby forming the transparent film main layer 110. This makes the transparent film main layer 110 have good waterproof and oil-proof properties, while having UV resistance and anti-aging performance, thereby significantly enhancing the weather resistance of the photovoltaic module 300. The high light transmittance and anti-ultraviolet properties of the organic fluorine film ensure that the energy conversion efficiency of the photovoltaic module 300 is not affected, while maintaining electrical safety during long-term use. The polyethylene terephthalate substrate with adhesive and organic fluorine film composite on both sides is covered with organic fluorine film on both sides, and uniform and firm bonding is achieved through the adhesive, thereby forming the transparent film main layer 110. The composite structure formed has better UV resistance and anti-aging performance.

[0052] In addition, in the present embodiment, the transparent pressure-sensitive adhesive layer 120 adopts an olefin polymer matrix pressure-sensitive adhesive or a rubber matrix pressure-sensitive adhesive. The reason for this is that olefin polymer matrix pressure-sensitive adhesives, such as polyethylene, polypropylene, etc., have good adhesion and weather resistance. At the same time, the chemical structure of olefin polymers is stable, and they can maintain their adhesive properties under long-term environmental exposure, especially under harsh weather conditions such as ultraviolet light, oxygen, and humidity, without significant degradation. Thus, it is ensured that the transparent pressure-sensitive adhesive layer 120 can still firmly adhere to the back glass 310 of the photovoltaic module 300 under high temperature and strong light conditions, reducing the risk of film layer peeling or warping. At the same time, olefin polymers have strong resistance to chemical corrosion and can effectively resist the erosion of environmental pollutants such as acid rain and salt mist, which has a significant effect on extending the service life of the photovoltaic module 300 and reducing maintenance requirements.

[0053] Rubber matrix pressure-sensitive adhesives, such as natural rubber and butyl rubber, have good elasticity and flexibility. Because rubber matrix pressure-sensitive adhesives can produce slight deformation under stress, they can adapt to the thermal expansion and contraction of the module material, avoiding the problem of cracking or falling off of the adhesive layer due to temperature changes. Rubber matrix pressure-sensitive adhesives also have good anti-aging properties, especially when exposed to ultraviolet light or ozone for a long time, they can still maintain their original adhesion and elasticity.

[0054] The application further provides a photovoltaic module 300 comprising the protective film of the back glass 310 of the photovoltaic module 300.

[0055] In the photovoltaic module 300 provided by the application, the protective film arranged on the back glass 310 of the photovoltaic module 300 can provide more comprehensive mechanical strength support for the photovoltaic module 300, and reduce the risk of glass breakage or continuous breakage caused by external environment, mechanical stress and thermal stress.

[0056] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0057] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A protective film for a back surface glass of a photovoltaic module, characterized by, The protective film comprises: a first insulating transparent film (100) arranged on the back glass (310) of the photovoltaic module (300), the first insulating transparent film (100) corresponding to the left and right sides of the junction box (320) of the photovoltaic module (300) respectively and extending along the length direction of the photovoltaic module (300) respectively; a second insulating transparent film (200) arranged on the back glass (310) of the photovoltaic module (300), the second insulating transparent film (200) connecting the first insulating transparent films (100) on the left and right sides of the junction box (320) and corresponding to the space between two adjacent junction boxes (320) or / and the space between the junction box (320) and the frame of the photovoltaic module (300).

2. The protective film for a back surface glass of a photovoltaic module according to claim 1, characterized by: The single-side edge of the second insulating transparent film (200) covers the first insulating transparent film (100) with a width of not less than 0.5 cm.

3. The protective film for the back glass of a photovoltaic module according to claim 1, wherein: the thickness of the first insulating transparent film (100) ranges from 200 μm to 350 μm; and / or the thickness of the second insulating transparent film (200) ranges from 200 μm to 350 μm.

4. The protective film for the back glass of a photovoltaic module according to claim 1, wherein: the length of the first insulating transparent film (100) ranges from the end of the first insulating transparent film (100) close to the junction box (320) to the silicone layer on the width edge of the photovoltaic module (300), and the width of the first insulating transparent film (100) ranges from the vertical distance of the silicone layer on the length edge of the photovoltaic module (300).

5. The protective film for the back glass of a photovoltaic module according to claim 1, wherein: the length of the second insulating transparent film (200) ranges from the vertical distance of the outer edge silicone of two adjacent junction boxes (320) or / and the vertical distance of the outer edge silicone of the junction box (320) and the silicone layer on the length edge of the photovoltaic module (300) close to the outer edge silicone of the junction box (320).

6. The protective film for the back glass of a photovoltaic module according to claim 1, wherein: the number of the second insulating transparent film (200) is greater than the number of the junction box (320).

7. The protective film for the back glass of a photovoltaic module according to claim 6, wherein: the number of the second insulating transparent film (200) is one more than the number of the junction box (320).

8. The protective film for the back glass of a photovoltaic module according to claim 1, wherein: the first insulating transparent film (100) comprises a transparent film main body layer (110) and a transparent pressure-sensitive adhesive layer (120), and the second insulating transparent film (200) has the same composition as the first insulating transparent film (100).

9. The protective film for the back glass of a photovoltaic module according to claim 8, wherein: The transparent film body layer (110) comprises a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on one side, a polyethylene terephthalate substrate coated with polytetrafluoroethylene resin on both sides, a polyethylene terephthalate substrate with adhesive and organic fluorine film on one side, or a polyethylene terephthalate substrate with adhesive and organic fluorine film on both sides; and / or the transparent pressure sensitive adhesive layer (120) is an olefin polymer matrix pressure sensitive adhesive or a rubber matrix pressure sensitive adhesive.

10. A photovoltaic module, characterized by: A protective film for a back glass of a photovoltaic module according to any one of claims 1 to 9.

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