Photovoltaic edge seal film and photovoltaic module

Abstract

The present disclosure relates to the field of photovoltaic technology, and particularly relates to a photovoltaic edge sealing adhesive film and a photovoltaic module. The photovoltaic edge sealing adhesive film provided by the present disclosure comprises a water-blocking layer, a heat-shrinkable layer and a functional adhesive layer arranged in layers, the heat-shrinkable layer is arranged between the water-blocking layer and the functional adhesive layer, and the functional adhesive layer is used for connecting with a laminated part. The heat-shrinkable layer will shrink by heat, and directional shrinkage will be generated under temperature triggering. Through the inward mechanical restraint force, the flow and overflow of the encapsulation adhesive film to the edges of the module are effectively inhibited, and the adhesive film amount of the four edges of the photovoltaic module tends to be consistent with the central region.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of photovoltaic technology, and in particular to a photovoltaic edge sealing adhesive film and a photovoltaic module. BACKGROUND

[0002] The laminated part of the photovoltaic module is mainly composed of a glass cover plate, a cell sheet, an encapsulating adhesive film, a back plate (single glass module) or another glass (double glass module), and the like, which are combined through a laminating process.

[0003] During the laminating process of the photovoltaic module, the adhesive film will flow under the action of high temperature and high pressure, and it is easy to overflow from the edge of the laminated part. This makes the adhesive film at the four edges of the module significantly less than at the middle position, resulting in a thinning of the edge thickness of the photovoltaic module. The thinning of the edge thickness not only weakens the mechanical protection ability of the edge of the module, making it more prone to breakage when subjected to external forces such as wind and sand, hail, etc., but also seriously affects the sealing performance of the module. SUMMARY

[0004] The present disclosure provides a photovoltaic edge sealing adhesive film and a photovoltaic module to at least solve the above technical problems existing in the prior art.

[0005] The first aspect of the present disclosure provides a photovoltaic edge sealing adhesive film, comprising: a water-blocking layer, a heat-shrinkable layer and a functional adhesive layer which are stacked, the heat-shrinkable layer is arranged between the water-blocking layer and the functional adhesive layer, and the functional adhesive layer is used to connect with a laminated part.

[0006] Further, the heat-shrinkable layer is formed of one of PVDC, PET, OPS and PETG.

[0007] Further, the thickness D1 of the heat-shrinkable layer satisfies: 50 μm ≤ D1 ≤ 150 μm.

[0008] Further, the thickness of the heat-shrinkable layer (55) is 100 μm.

[0009] Further, the water-blocking layer comprises a fluorine film layer, and the thickness D3 of the fluorine film layer satisfies: 5 μm ≤ D3 ≤ 50 μm.

[0010] Further, the water-blocking layer comprises a bonding layer, the bonding layer is stacked with the fluorine film layer, and the bonding layer is connected with the heat-shrinkable layer.

[0011] Further, the thickness D4 of the bonding layer satisfies: 10 μm ≤ D4 ≤ 18 μm.

[0012] Further, the thickness D2 of the functional adhesive layer satisfies: 8 μm ≤ D2 ≤ 20 μm.

[0013] The second aspect of the present disclosure provides a photovoltaic module, comprising:

[0014] A laminate comprising a front panel, a first adhesive layer, a battery string, a second adhesive layer, and a back panel stacked together, wherein the front panel and the battery string are bonded together by the first adhesive layer, and the battery string and the back panel are bonded together by the second adhesive layer.

[0015] A photovoltaic edge sealing film is disposed on the side of the laminate, and the photovoltaic edge sealing film is sealed to the front panel and the back panel respectively;

[0016] The photovoltaic edge sealing film is the photovoltaic edge sealing film described in the first aspect.

[0017] Furthermore, the photovoltaic sealing film is disposed around the perimeter of the laminate.

[0018] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0019] The photovoltaic edge-sealing film provided in this embodiment includes a water-blocking layer, a heat-shrinkable layer, and a functional adhesive layer stacked together. The heat-shrinkable layer is disposed between the water-blocking layer and the functional adhesive layer, and the functional adhesive layer is used to connect with the laminate. In use, the functional adhesive layer is connected to the laminate. The functional adhesive layer is disposed on one side of the heat-shrinkable layer and is used to adhere the heat-shrinkable layer to the edge of the laminate during the lamination process. The water-blocking layer is disposed on the side of the laminate away from the photovoltaic module, facing outward, to directly resist external water vapor, dust, and other environmental erosion. The heat-shrinkable layer is disposed facing the laminate for connection with the laminate. The heat-shrinkable layer undergoes thermal shrinkage, producing directional shrinkage under temperature triggering. Through inward mechanical constraint, it effectively inhibits the flow and overflow of the encapsulating film to the edge of the module, ensuring that the amount of encapsulating film on the four sides of the photovoltaic module is consistent with that in the central area. The stress generated during the shrinkage process drives the adhesive on the side of the laminate to redistribute, eliminating the problem of uneven coating thickness caused by traditional processes, so that the film forms a uniform and dense sealing layer at the edge of the module. The shrinkage force of the heat-shrinkable layer also tightly presses the outer water-blocking layer against the edge of the component. Together, they form a composite protection system of "dynamic fastening + static barrier", which can greatly reduce the risk of water vapor penetration at the edge.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0021] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0022] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0023] Figure 1 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of this disclosure is shown. Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of this disclosure is shown. Figure 2 ;

[0025] Figure 3 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of this disclosure is shown. Figure 3 ;

[0026] Figure 4 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of this disclosure is shown. Figure 4 ;

[0027] Figure 5 A schematic diagram of the structure of the photovoltaic edge-sealing film provided in an embodiment of this disclosure is shown.

[0028] The labels in the diagram are as follows: 1. Front panel; 2. Battery string; 3. Back panel; 4. Encapsulation film; 41. First encapsulation film layer; 42. Second encapsulation film layer; 51. First part; 52. Second part; 53. Third part; 54. Water-blocking layer; 541. Fluorine film layer; 542. Adhesive layer; 55. Heat-shrinkable layer; 56. Functional adhesive layer. Detailed Implementation

[0029] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] like Figure 4 As shown, the photovoltaic module provided in this embodiment includes a laminate and a photovoltaic edge-sealing film. The laminate includes a front panel 1, a first film layer 41, a battery string 2, a second film layer 42, and a back panel 3, all stacked together. The front panel 1 and the battery string 2 are bonded together by the first film layer 41, and the battery string 2 and the back panel 3 are bonded together by the second film layer 42. Further, the first film layer 41 and the second film layer 42 are bonded together around the battery string 2. The photovoltaic edge-sealing film is disposed on the side of the laminate and is sealed to both the front panel 1 and the back panel 3. In this embodiment, the photovoltaic edge-sealing film surrounds the photovoltaic module. During the lamination process, the photovoltaic edge-sealing film can reduce film overflow on all four sides, enhancing the module's reliability.

[0031] In some specific embodiments, the photovoltaic sealing film is applied around the perimeter of the laminate. During the lamination process, it effectively slows down the flow and overflow of the first and second film layers 41 and 42 towards the module edge through physical blocking. This avoids the problem of insufficient film allowance at the module edges compared to the central area due to excessive film loss, thus solving the problem of thinner edge thickness and making the film distribution more uniform between the module edges and the central area, significantly improving thickness consistency.

[0032] In some specific implementation methods, such as Figure 1 As shown, the photovoltaic edge sealing film includes a first part 51, a second part 52, and a third part 53 connected in sequence. The photovoltaic edge sealing film surrounds the photovoltaic module. The first part 51 covers the surface of the front panel 1 away from the back panel 3 and is sealed to the front panel 1. The third part 53 covers the surface of the back panel 3 away from the front panel 1 and is sealed to the back panel 3. Optionally, the first part 51, the second part 52, and the third part 53 are an integral structure. The first part 51 covers and seals the surface of the front panel 1, preventing rainwater and dust from entering from the top edge; the third part 53 covers and seals the surface of the back panel 3, preventing moisture from seeping into the module from the bottom edge; the second part 52 serves as a side connection section, filling the gap between the front panel 1 and the back panel 3 to form a complete sealing loop. Compared to traditional single-section edge sealing (such as simply using tape to stick the side), the first part 51, the second part 52, and the third part 53 of the photovoltaic edge sealing film seal the front panel 1, the side panel, and the back panel 3 of the photovoltaic module, respectively. This can improve the sealing performance and make it suitable for harsh environments such as high humidity and salt spray. It can also reduce the risk of yellowing and hydrolysis of the encapsulation film 4 due to moisture at the edges.

[0033] Optionally, the first part 51 is bonded to the front panel 1, the second part 52 is bonded to the side of the photovoltaic module, and the third part 53 is bonded to the back panel 3.

[0034] It should be noted that in this embodiment, the encapsulating film 4 includes a first film layer 41 and a second film layer 42.

[0035] A single-glass photovoltaic (PV) module mainly consists of a glass cover, encapsulating film, solar cells, a backsheet, and a frame. A double-glass PV module is a PV module made by laminating two pieces of glass and solar cells together with an encapsulating film. The PV edge-sealing film provided in this disclosure can be applied to both single-glass and double-glass PV modules.

[0036] like Figure 2 and Figure 5As shown, the photovoltaic edge-sealing film provided in this embodiment includes a water-blocking layer 54, a heat-shrinkable layer 55, and a functional adhesive layer 56 stacked together. The heat-shrinkable layer 55 is disposed between the water-blocking layer 54 and the functional adhesive layer 56, and the functional adhesive layer 56 is used to connect with the laminate. The functional adhesive layer 56 is disposed on one side of the heat-shrinkable layer 55 and is used to adhere the heat-shrinkable layer 55 to the edge of the laminate during the lamination process. The water-blocking layer 54 is disposed on the other side of the heat-shrinkable layer 55 and is used to provide good water-blocking performance. The water-blocking layer 54 is disposed on the side of the laminate away from the photovoltaic module, and the water-blocking layer 54 is disposed outward to directly resist external water vapor, dust, and other environmental erosion. The heat-shrinkable layer 55 is disposed towards the laminate for connection with the laminate. The heat-shrinkable layer 55 undergoes thermal shrinkage, undergoing directional shrinkage triggered by temperature. Through inward mechanical constraint, it effectively inhibits the flow and overflow of the encapsulating film 4 towards the module edge, ensuring that the amount of encapsulating film on all four sides of the photovoltaic module is consistent with that in the central area. The stress generated during the shrinkage process drives the redistribution of adhesive on the sides of the laminate, eliminating the problem of uneven coating thickness caused by traditional processes, and forming a uniform and dense sealing layer at the module edge. The shrinkage force of the heat-shrinkable layer 55 also tightly presses the outer water-blocking layer 54 against the module edge. Together, they construct a composite protection system of "dynamic fastening + static barrier," which can greatly reduce the risk of moisture penetration at the edge.

[0037] During the lamination process, the heat-shrinkable layer 55 will undergo heat shrinkage, which makes the photovoltaic edge sealing film adhere tightly to the edge of the laminate. At the same time, the water-blocking layer 54 can effectively prevent water vapor from penetrating from the edge of the photovoltaic edge sealing film into the interior of the photovoltaic module.

[0038] In other words, the heat-shrinkable layer 55 of the photovoltaic edge-sealing film constrains the encapsulating film 4 through its directional shrinkage characteristics under the high-temperature lamination environment. This dynamic shrinkage process not only effectively prevents the film from flowing towards the module edge, but also drives the adhesive to redistribute through mechanical force, achieving self-balancing of the adhesive on the side of the laminate. The tight adhesion force generated when the heat-shrinkable layer 55 shrinks, combined with the physical barrier properties of the outer water-blocking layer 54, forms a composite protective structure of "dynamic fastening + static barrier". The water-blocking layer 54 can effectively block the intrusion of external moisture; at the same time, the shrinkage stress of the heat-shrinkable layer 55 makes the water-blocking layer and the module edge form a seamless fit, further eliminating sealing gaps and reducing the risk of moisture penetration at the edge.

[0039] Among them, the heat-shrinkable layer 55 is a functional layer with heat-shrinkable properties, usually made of polymer materials (such as polyethylene, polyolefin, polyester, etc.). Its core feature is that when heated to a specific temperature (such as 60-200℃), it will undergo directional shrinkage due to the rearrangement of molecular chains, tightly adhering to the surface of the object to form a uniform and firm coating layer. During the lamination process, the heat-shrinkable layer 55 undergoes heat shrinkage, which allows the adhesive to become denser and more uniform. The water-blocking layer 54 is a material layer whose core function is to prevent water penetration. It is usually composed of materials with low water absorption, high hydrophobicity, or a dense structure. Its function is to form a physical barrier in specific scenarios, preventing the intrusion of liquid water, water vapor, or other fluid media, thereby protecting the internal structure or functional components from water damage. The heat-shrinkable layer 55 undergoes heat shrinkage during the lamination process, allowing the water-blocking layer 54 to adhere tightly to the edges of the photovoltaic module laminate. In some specific embodiments, such as Figure 3 As shown, the water-blocking layer 54 includes a fluorine film layer 541, the thickness D3 of which satisfies: 5μm ≤ D3 ≤ 50μm. The fluorine film layer 541 is a thin film made from a fluorine-containing polymer material. Its core characteristic is the presence of a large number of fluorine atoms (F) in its molecular structure. Through the strong chemical stability and unique physical properties of the CF bond, it becomes a high-performance functional material. In this embodiment, the thickness of the fluorine film layer 541 is between 5μm and 50μm, which avoids the presence of micropores or defects in the material due to excessive thickness (e.g., <5μm), resulting in a loss of water-blocking ability. When the thickness of the fluorine film layer 541 is too large (e.g., >50μm), it can lead to excessively high material stiffness and decreased flexibility. In this embodiment, the thickness of the fluorine film layer 541 is less than or equal to 50μm, which ensures the water-blocking effect while controlling the amount of material used, thus improving the cost-effectiveness of the component.

[0040] Optionally, the fluorine film layer 541 is made of a fluorine-containing material and is a fluorine-containing coating applied to the substrate layer, with a thickness of 5–50 μm, preferably 20 μm. The fluorine film layer 541 comprises 70–85% by mass of a main material, 10–15% by mass of additives, and 5–10% by mass of a curing agent. The main material is one or a combination of polytetrafluoroethylene fluorocarbon resin, polydifluoroethylene fluorocarbon resin, or perfluorinated resin; the additives are one or a combination of nano-silica, nano-alumina, nano-zinc oxide, and nano-titanium oxide; and the curing agent is one or a combination of isocyanate compounds, amino resin compounds, and modified acrylic compounds.

[0041] In some specific embodiments, the water-blocking layer 54 includes an adhesive layer 542, which is stacked with the fluoropolymer film layer 541. The adhesive layer 542 is connected to the heat-shrinkable layer 55, and the thickness D4 of the adhesive layer 542 satisfies: 10μm≤D4≤18μm. The adhesive layer 542 can be made of acrylic or silicone adhesives, whose molecular chains contain polar groups such as hydroxyl (-OH) and carboxyl (-COOH) groups. It can form physical entanglement with the fluoropolymer film layer 541 (such as the -CF2- group of PVDF) through hydrogen bonds and van der Waals forces, and at the same time undergo chemical coupling reaction with the heat-shrinkable layer 55 (such as the ester group of EVA or POE film) (such as the bridging effect of silane coupling agents).

[0042] Optionally, the fluorine film layer 541 is made of polyvinylidene fluoride resin material with a thickness of 10–50 μm, preferably 30 μm. The fluorine film layer 541 comprises 65–75% by mass of a base material, 12–14% by mass of additives, and 6–8% by mass of a curing agent. The additives are a combination of nano-silica and nano-alumina; the curing agent is a combination of isocyanate compounds and amino resin compounds. The adhesive layer 542 is made of polyurethane material with a thickness of 10–18 μm, preferably 14 μm.

[0043] In some specific embodiments, the thickness D1 of the heat-shrinkable layer 55 satisfies the condition: 50μm≤D1≤150μm, which balances water blocking and process efficiency. The heat-shrinkable layer 55 possesses sufficient molecular chain density (such as the high crystallinity of PVDC materials) to prevent moisture from penetrating in liquid or gaseous form, especially forming a continuous sealing layer at the edge seams of the module, preventing moisture from intruding into critical areas such as the cell string 2 and solder ribbons. A thickness between 50μm and 150μm for the heat-shrinkable layer 55 allows for easier control of thickness uniformity, reducing pinhole defects caused by excessive thinness or uneven shrinkage stress caused by excessive thickness (such as localized wrinkles forming gaps), ensuring the integrity of the water-blocking barrier. When the heat-shrinkable layer 55 is disposed inside the water-blocking layer 54, its moderate thickness allows the water-blocking layer 54 to adhere tightly to the surface of the photovoltaic module, forming a double water-blocking barrier and improving the water-blocking effect.

[0044] Optionally, the heat-shrinkable layer 55 can be made of PVDC material with a thickness of 50μm to 150μm, preferably 100μm. This substrate layer undergoes heat shrinkage during lamination, allowing the photovoltaic sealing film to adhere tightly to the edge of the photovoltaic module.

[0045] In some specific embodiments, the thickness of the heat shrinkable layer 55 is 100μm. When the 100μm heat shrinkable layer is disposed inside the water-blocking layer 54, the radial pressure generated after shrinkage can make the thick water-blocking layer and the laminate form a stable sealing interface, thereby improving the sealing effect.

[0046] In some specific embodiments, the heat-shrinkable layer 55 is made of PVDC material. PVDC stands for polyvinylidene chloride, a thermoplastic polymerized from vinylidene chloride (VDC) monomers. PVDC has a surface energy of approximately 32 mN / m (close to polypropylene), lower than the surface tension of water (72 mN / m), allowing water droplets to have a contact angle of over 90° on the material surface, exhibiting a hydrophobic repulsion effect. When the thickness of the heat-shrinkable layer 55 is ≥80 μm, a "lotus leaf effect" level hydrophobic surface can be formed, allowing liquid water to automatically roll off under gravity, preventing retention and penetration.

[0047] In some specific embodiments, the heat-shrinkable layer 55 is formed from one or a combination of at least two of PVDC, PET, OPS, and PETG. PET is short for polyethylene terephthalate, a thermoplastic polyester made from terephthalic acid (PTA) and ethylene glycol (EG) through a polycondensation reaction. OPS is short for Oriented Polystyrene Films, also known as biaxially oriented polystyrene. PETG, short for Polyethylene Terephthalate Glycol-modified, is a modified PET (polyethylene terephthalate) material.

[0048] In this embodiment, PVDC, PET, OPS, or PETG are selected as the substrate for the heat-shrinkable layer 55, which can achieve precise heat shrinkage response. PVDC (polyvinylidene chloride) has a high shrinkage rate (30%-50%) and rapid shrinkage characteristics, and can quickly generate inward pulling force at the lamination temperature, effectively restraining the overflow of the encapsulating film 4; PET (polyethylene terephthalate) and PETG (ethylene glycol modified polyethylene terephthalate) have good heat resistance and moderate shrinkage rate (15%-25%), which can avoid component deformation caused by excessive shrinkage, while ensuring that the water-blocking layer (54) is tightly bonded to the laminate. Through material combination design, the heat shrinkage curve can be flexibly adjusted to adapt to different lamination process requirements.

[0049] The photovoltaic edge sealing film employs a composite structure of "water-blocking layer 54 - heat-shrinkable layer 55 - functional adhesive layer 56". Through the synergistic properties and interface matching of each layer, the environmental adaptability, mechanical reliability, and long-term service life of the photovoltaic module can be significantly improved. The functional adhesive layer 56 can physically fill the cutting defects (such as glass edge roughness) at the edge of the photovoltaic module, increasing the contact area of ​​the sealing boundary of the photovoltaic edge sealing film by more than 30%.

[0050] Optionally, the functional adhesive layer 56 can be made of butyl rubber to provide good shock absorption and water resistance. Additionally, a UV absorber can be added to the functional adhesive layer 56 to improve the light stability of the sealing tape and prevent it from detaching from the self-adhesive points.

[0051] Optionally, the functional adhesive layer 56 is made of butyl rubber material with a thickness of 8–20 μm, preferably 12 μm. The butyl rubber material comprises 70–85% by mass of a main resin, 5–10% by mass of a curing agent, 10–15% by mass of an antioxidant, and 10–15% by mass of a UV absorber. The main resin is one or a combination of butyl rubber, isobutyl rubber, and chloroprene rubber; the curing agent is one or a combination of isocyanate compounds, amino resin compounds, and modified acrylic compounds; the antioxidant is one or a combination of aromatic amine compounds and hindered phenolic compounds; and the UV absorber is one or a combination of salicylate compounds, benzophenone compounds, benzotriazole compounds, and substituted acrylonitrile compounds.

[0052] Optionally, the functional adhesive layer 56 is made of butyl rubber material with a thickness of 10–18 μm, preferably 14 μm. The butyl rubber material comprises 75–80% by mass of a main resin, 6–8% by mass of a curing agent, 11–13% by mass of an antioxidant, 6–8% by mass of a curing agent, and 11–13% by mass of a UV absorber.

[0053] In some specific embodiments, the thickness D2 of the functional adhesive layer 56 satisfies: 8μm≤D2≤20μm. The functional adhesive layer 56 can fully wet the surface of the photovoltaic module (such as glass, backsheet 3, etc.), forming effective chemical bonding or mechanical interlocking, ensuring long-term bonding strength (such as tensile strength and shear strength), and avoiding interlayer delamination due to external forces (such as wind pressure and vibration). If the amount of adhesive in the functional adhesive layer 56 is insufficient (<8μm), it cannot completely fill the microscopic gaps at the interface, resulting in insufficient adhesion, which can easily lead to local delamination or separation, affecting the service life of the module. If the amount of adhesive in the functional adhesive layer 56 is excessive (>20μm), the solvent inside the functional adhesive layer 56 will not evaporate sufficiently, and bubbles or pores may remain after curing, forming stress concentration points, which may cause electrical breakdown risk (especially in high-voltage modules) or long-term weather resistance degradation (such as accelerated degradation of the adhesive layer in humid and hot environments). In this embodiment, the thickness of the functional adhesive layer 56 is between 8μm and 20μm, which can tightly cover the interface between the heat shrinkable layer 55 and the photovoltaic module, fill any possible gaps, form a continuous water barrier, prevent moisture from seeping into the module from the sealing area (such as eroding the cell string 2, solder ribbon, etc.), and improve the resistance to damp heat aging.

[0054] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this embodiment can be achieved, and this is not limited herein.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A photovoltaic edge-sealing film, characterized in that, include: A water-blocking layer (54), a heat-shrinkable layer (55), and a functional adhesive layer (56) are stacked together. The heat-shrinkable layer (55) is disposed between the water-blocking layer (54) and the functional adhesive layer (56). The functional adhesive layer (56) is used to connect with the laminate.

2. The photovoltaic edge-sealing film according to claim 1, characterized in that, The heat-shrinkable layer (55) is formed of one of PVDC, PET, OPS and PETG.

3. The photovoltaic edge-sealing film according to claim 1, characterized in that, The thickness D1 of the heat shrinkable layer (55) satisfies: 50μm≤D1≤150μm.

4. The photovoltaic edge-sealing film according to claim 1, characterized in that, The thickness of the heat-shrinkable layer (55) is 100 μm.

5. The photovoltaic edge-sealing film according to claim 1, characterized in that, The water-blocking layer (54) includes a fluorine film layer (541), and the thickness D3 of the fluorine film layer (541) satisfies: 5μm≤D3≤50μm.

6. The photovoltaic edge-sealing film according to claim 5, characterized in that, The water-blocking layer (54) includes an adhesive layer (542), which is stacked with the fluoropolymer film layer (541) and connected to the heat-shrinkable layer (55).

7. The photovoltaic edge-sealing film according to claim 6, characterized in that, The thickness D4 of the adhesive layer (542) satisfies: 10μm≤D4≤18μm.

8. The photovoltaic edge-sealing film according to claim 1, characterized in that, The thickness D2 of the functional adhesive layer (56) satisfies: 8μm≤D2≤20μm.

9. A photovoltaic module, characterized in that, include: A laminate comprising a front panel (1), a first adhesive layer (41), a battery string (2), a second adhesive layer (42), and a back panel (3) stacked together, wherein the front panel (1) and the battery string (2) are bonded together by the first adhesive layer (41), and the battery string (2) and the back panel (3) are bonded together by the second adhesive layer (42). A photovoltaic edge sealing film is disposed on the side of the laminate, and the photovoltaic edge sealing film is sealed to the front plate (1) and the back plate (3) respectively; The photovoltaic edge sealing film is the photovoltaic edge sealing film according to any one of claims 1 to 8.

10. The photovoltaic module according to claim 9, characterized in that, The photovoltaic sealing film is applied around the perimeter of the laminate.

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