A kind of gap reflective film and photovoltaic module

Abstract

The utility model discloses a gap reflective film, comprising an insulating layer, a reflective layer and an adhesive layer which are sequentially arranged from the side away from the plate to be filmed to the side facing the plate to be filmed; the reflective layer comprises a metal substrate and a microstructure arranged on the surface of the metal substrate, the microstructure is a microstructure formed by rolling on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure; the reflective layer is bonded to the plate to be filmed through the adhesive layer, and the insulating layer covers the surface of the reflective layer facing away from the adhesive layer to isolate the reflective layer from the external environment. The reflective layer is formed by arranging the microstructure by rolling the metal substrate, so that the reflective layer is an integrated structure as a whole, and the reflective layer is isolated from the external environment by cooperating with the arranged insulating layer, so that the high reliability of the gap reflective film can be ensured, and the thickness of the gap reflective film can be reduced by reducing the use of a layer of metal substrate, so that it is convenient to match with a low-weight adhesive film, and is compatible with the packaging structure of single and double glass components.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a gap reflective film and a photovoltaic component. Background Art

[0002] With the rapid development of the photovoltaic industry, while ensuring reliability, increasing efficiency and reducing costs have become the core indicators pursued by the industry. How to make full use of the spacing between components and the light received by the component surface has become a major direction for improving efficiency. At this stage, the photovoltaic industry has launched a component gap film solution, which uses vacuum evaporation of aluminum oxide on the surface of PET (Polyethylene terephthalate, thermoplastic polyester) substrate to achieve reflection, and also coats the surface of the PET substrate with EVA (ethylene-vinyl acetate copolymer) / POE (polyolefin elastomer) film to achieve adhesion with the backplane substrate.

[0003] However, in actual use, there are mainly the following problems: In terms of reliability, the specific surface area of ​​vacuum-evaporated aluminum is relatively large, and it is easy to hydrolyze in hot and humid conditions, resulting in a decrease in power, and the film can only be used for double-glass packaging. In actual use, it is necessary to avoid the edges of the components and the positions where water vapor easily invades. In addition, the PET substrate itself has poor aging resistance. It will turn yellow after 2 to 3 years of outdoor use in high-ultraviolet areas, seriously affecting the appearance. During the processing process, the adhesive layer of the PET back film is different from the formula system of the conventional encapsulation film, and this layer is subjected to high temperatures for film pasting and lamination, resulting in poor appearance bubbles after lamination. When paired with a low-weight film, due to the low thickness of the component film and the thickness of the film PET substrate + adhesive layer of more than 70μm, the reflective layer aluminum contacts the battery and causes a short circuit, which seriously affects the power output and reliability of the component.

[0004] Therefore, how to provide a high-reliability gap reflective film is an urgent problem that technicians in this field need to solve. Utility Model Content

[0005] The purpose of the utility model is to provide a gap reflective film with higher reliability; another purpose of the utility model is to provide a photovoltaic module with higher reliability.

[0006] In order to solve the above technical problems, the utility model provides a gap reflective film, comprising an insulating layer, a reflective layer and an adhesive layer arranged in sequence;

[0007] The reflective layer includes a metal substrate and a microstructure arranged on the surface of the metal substrate, wherein the microstructure is a microstructure formed by rolling on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure;

[0008] The reflective layer is bonded to the sheet material to be laminated via the adhesive layer, and the insulating layer covers the surface of the reflective layer on the side facing away from the adhesive layer.

[0009] Optionally, the metal substrate is an aluminum sheet or a tin-lead alloy sheet.

[0010] Optionally, the microstructure includes triangular prism-shaped protrusions.

[0011] Optionally, the cross-section of the triangular prism-shaped protrusion is an isosceles triangle, and the vertex angle of the triangular prism-shaped protrusion ranges from 90° to 150°; the height of the triangular prism-shaped protrusion ranges from 5μm to 12μm; and the angle between the axis of the triangular prism-shaped protrusion and the extension direction of the reflective layer ranges from 10° to 60°.

[0012] Optionally, the insulating layer is an organic insulating silicone layer.

[0013] Optionally, the thickness of the organic insulating silicone layer ranges from 10 μm to 50 μm.

[0014] Optionally, the bonding layer is a thermosetting adhesive bonding layer.

[0015] Optionally, the thickness of the thermosetting adhesive layer ranges from 5 μm to 20 μm.

[0016] Optionally, the material of the thermosetting adhesive layer is the same as that of the insulating layer.

[0017] The utility model also provides a photovoltaic module, comprising a gap reflective film as described in any of the above items, and a front plate, an upper layer of adhesive film, a battery cell, a lower layer of adhesive film and a back plate stacked in sequence along the thickness direction, wherein the gap reflective film is arranged in a blank area outside the battery cell.

[0018] The utility model provides a gap reflective film, comprising an insulating layer, a reflective layer and an adhesive layer arranged in sequence; the reflective layer comprises a metal substrate and a microstructure arranged on the surface of the metal substrate, the microstructure is a microstructure formed by rolling on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure; the reflective layer is bonded to a plate to be bonded through the adhesive layer, and the insulating layer covers the surface of the reflective layer on the side facing away from the adhesive layer.

[0019] The reflective layer is formed by calendering the metal substrate to set a microstructure, so that the reflective layer has an integrated structure as a whole, and the insulating layer is set to prevent the gap reflective film from being punctured and short-circuited, thereby ensuring the high reliability of the gap reflective film. By reducing the use of one layer of substrate, the thickness of the gap reflective film can be reduced, which is convenient for matching with low-weight adhesive film and is compatible with single- and double-glass component packaging structures.

[0020] The utility model also provides a photovoltaic module, which also has the above-mentioned beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a gap reflective film provided by an embodiment of the utility model;

[0023] Figure 2 A flow chart of a first method for setting a gap reflective film provided by an embodiment of the utility model;

[0024] Figure 3 This is a flow chart of a second method for setting a gap reflective film provided in an embodiment of the utility model.

[0025] In the figure: 1. Reflective layer, 2. Adhesive layer, 3. Insulation layer, 4. Board to be laminated. DETAILED DESCRIPTION

[0026] The core of the utility model is to provide a gap reflective film. In the prior art, the gap filming scheme of the components adopts vacuum evaporation of aluminum oxide on the surface of the PET substrate to achieve reflection, and EVA / POE film is coated on the surface of the PET substrate to achieve adhesion with the backplane substrate.

[0027] However, in actual use, there are mainly the following problems. In terms of reliability, the specific surface area of ​​vacuum-evaporated aluminum is relatively large, and it is easy to hydrolyze in hot and humid conditions, resulting in a decrease in power. In addition, the film can only be used for double-glass packaging. In actual use, it is necessary to avoid the edges of the components and the positions where water vapor easily invades. In addition, the PET substrate itself has poor aging resistance. It will turn yellow after 2 to 3 years of outdoor use in high-ultraviolet areas, which seriously affects the appearance. In the processing process, the adhesive layer of the PET back film is different from the formula system of the conventional encapsulation film, and this layer is subjected to high temperatures for film pasting and lamination, resulting in poor appearance bubbles after lamination. When paired with a low-weight film, due to the low thickness of the component film and the thickness of the film PET substrate + adhesive layer of more than 70μm, the reflective layer aluminum contacts the battery and causes a short circuit, which seriously affects the power output and reliability of the component.

[0028] The utility model provides a gap reflective film, including an insulating layer, a reflective layer and an adhesive layer arranged in sequence; the reflective layer includes a metal substrate and a microstructure arranged on the surface of the metal substrate, the microstructure is a microstructure formed by calendering on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure; the reflective layer is bonded to the plate to be bonded through the adhesive layer, and the insulating layer covers the surface of the reflective layer that is opposite to the reflective layer and the surface of the adhesive layer that is opposite to the reflective layer.

[0029] The reflective layer is formed by calendering the metal substrate to set a microstructure, so that the reflective layer has an integrated structure as a whole, and the insulating layer is set to prevent the gap reflective film from being punctured and short-circuited, thereby ensuring the high reliability of the gap reflective film. By reducing the use of a layer of metal substrate, the thickness of the gap reflective film can be reduced, which is convenient for matching with low-weight adhesive film and is compatible with single- and double-glass component packaging structures.

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a gap reflective film provided in an embodiment of the utility model.

[0033] See also Figure 1 In an embodiment of the utility model, the gap reflective film includes an insulating layer 3, a reflective layer 1 and an adhesive layer 2 which are arranged in sequence; the reflective layer 1 includes a metal substrate and a microstructure arranged on the surface of the metal substrate, the microstructure is a microstructure formed by calendering on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure; the reflective layer 1 is bonded to the sheet material to be bonded through the adhesive layer 2, and the insulating layer 3 covers the surface of the reflective layer 1 on the side facing away from the adhesive layer 2.

[0034] In this embodiment, the reflective layer 1 is usually composed of a metal substrate and a microstructure prepared on the surface of the metal substrate based on a calendering process. Therefore, the metal substrate and the microstructure are made of the same material and are an integrated structure, and the metal substrate is usually a metal material with reflective properties and easy to calender. Of course, in this embodiment, the specific material of the metal substrate is not limited. As long as it has a certain reflective property and can be used for reflection, and can be applied to the calendering process to form a microstructure, no specific limitation is made here. Usually, in this embodiment, an aluminum sheet or a tin-lead alloy sheet is selected as the metal substrate, that is, the metal substrate is an aluminum sheet or a tin-lead alloy sheet, and the corresponding material of the microstructure is also the corresponding aluminum or tin-lead alloy.

[0035] The microstructure in the above-mentioned reflective layer 1 is a structure formed by calendering the metal substrate. In this embodiment, a roller with a pattern on the surface can be used to extrude the corresponding microstructure on the metal substrate. The specific preparation method of the reflective layer 1 will be described in detail in the following utility model embodiments, and will not be repeated here. When the above-mentioned metal substrate is thin, microstructures may be formed on both opposite surfaces of the metal substrate during the calendering process, one surface of which is a convex microstructure and the other surface is a relatively concave microstructure. When the metal substrate is thick, it is also possible to form the above-mentioned microstructure only on one surface of the metal substrate. At this time, when setting the gap reflective film provided in this embodiment, it is necessary to ensure that the surface of the reflective layer 1 on which the microstructure is formed faces the light incident side of the photovoltaic module.

[0036] Specifically, in this embodiment, the microstructure includes a triangular prism-shaped protrusion. Using a triangular prism-shaped protrusion as the above microstructure can make more light incident from the outside to the gap between the cells be reflected back to the cells, so as to improve the utilization rate of the incident light by the photovoltaic module. Usually in this embodiment, a plurality of triangular prism-shaped protrusions distributed in an array are embossed on the surface of the metal substrate, and the axes of the plurality of triangular prism-shaped protrusions are usually parallel to each other.

[0037] In this embodiment, the cross section of the triangular prism-shaped protrusion is usually an isosceles triangle, and the angle of the triangular prism-shaped protrusion vertex angle ranges from 90° to 150°, preferably 120°; the height of the triangular prism-shaped protrusion ranges from 5μm to 12μm; the triangular prism-shaped protrusion is usually distributed obliquely, that is, the angle between the axis of the triangular prism-shaped protrusion and the extending direction of the reflective layer 1 ranges from 10° to 60°. In this embodiment, the overall thickness of the reflective layer 1 is usually 10μm to 50μm.

[0038] In this embodiment, a bonding layer 2 is provided on one side of the reflective layer 1, and the reflective layer 1 is provided in the photovoltaic module through the bonding layer 2. It should be noted that the gap reflective film provided in this embodiment is a gap reflective film that has been provided in the photovoltaic module, and before being provided in the photovoltaic module, the bonding layer 2 is usually not provided on one side of the reflective layer 1, and the reflective layer 1 is also stored in the form of a roll. After being provided in the photovoltaic module, the bonding layer 2 is provided on one side of the reflective layer 1, so that the gap reflective film can be bonded and fixed to a plate in the photovoltaic module, usually to a back plate in the photovoltaic module.

[0039] Specifically, the bonding layer 2 is usually a thermosetting adhesive bonding layer 2, which fixes the gap reflective film by heating. The material of the thermosetting adhesive bonding layer 2 can be organic insulating silica gel. The specific material of the bonding layer 2 is not specifically limited in this embodiment and depends on the specific situation. The thickness of the thermosetting adhesive bonding layer 2 is usually in the range of 5 μm to 20 μm.

[0040] In this embodiment, an insulating layer 3 is disposed on the other side of the reflective layer 1, and the insulating layer 3 needs to cover the surface of the reflective layer 1 facing away from the adhesive layer 2 to prevent the gap reflective film from being punctured and short-circuited. The insulating layer 3 usually needs to cover all exposed surfaces of the reflective layer 1.

[0041] In the present embodiment, the insulating layer 3 is usually an organic insulating silicone layer, that is, the material of the insulating layer 3 can be organic silicone. Of course, in the present embodiment, the insulating layer 3 of other materials can also be selected, and the specific material of the insulating layer 3 is not specifically limited in the present embodiment. The thickness of the above insulating silicone layer is usually in the range of 10μm to 50μm. It should be noted that in order to facilitate the setting of the gap reflective film, in the present embodiment, the material of the thermosetting adhesive bonding layer 2 and the material of the insulating layer 3 can be the same. The same material is used as both the bonding layer 2 and the insulating layer 3, which can facilitate the preparation of the gap reflective film. It should be noted that the above insulating layer 3 can be pre-set on the surface of the reflective layer 1 for winding up before the preparation of the photovoltaic module, or it can be temporarily set on the surface of the reflective layer 1 during the preparation of the photovoltaic module. The specific content will be described in detail in the following utility model embodiments, and will not be repeated here.

[0042] The present embodiment provides a gap reflective film, in which a reflective layer 1 is formed by arranging a microstructure on a metal substrate by calendering, so that the reflective layer 1 is an integrated structure as a whole, and the insulating layer 3 is arranged to prevent the gap reflective film from being punctured and short-circuited, thereby ensuring the high reliability of the gap reflective film. The thickness of the gap reflective film can be reduced by reducing the use of a layer of substrate, which is convenient for matching with a low-weight adhesive film and is compatible with single-glass and double-glass component packaging structures.

[0043] Embodiment 2

[0044] A method for setting a gap reflective film will be provided below, and the setting method and the structure of the gap reflective film mentioned above can correspond to each other.

[0045] Please refer to Figure 2 , Figure 2 This is a flow chart of a first method for setting a gap reflective film provided in an embodiment of the utility model.

[0046] See also Figure 2 In this embodiment, the method for setting the gap reflective film includes:

[0047] S101: rolling the metal substrate to form a microstructure on the surface of the metal substrate to form a reflective layer.

[0048] In this step, a pressing roller with a preset pattern engraved on its surface is usually used to extrude a corresponding microstructure on the above-mentioned metal substrate. For example, a pressing roller engraved with a triangular prism shape is used to extrude a corresponding triangular prism structure on the above-mentioned metal substrate to form a reflective layer 1. The reflective layer 1 is then cut into rolls according to fixed specifications for later use.

[0049] S102: Printing an adhesive material as an adhesive layer in a preset area of ​​the sheet material to be laminated.

[0050] The plate to be pasted with film is usually a backboard, so the backboard needs to be laid before this step, and then an adhesive material such as silicone thermosetting adhesive is printed on the backboard surface at the position where the reflective film needs to be laid at the sheet spacing and string spacing.

[0051] Before the glue is printed, that is, before this step, the adhesive material can be degassed. After printing, it can be preheated at 60°C to 120°C for 1s-3s to expel bubbles from the adhesive material, ensuring that there are no or only a small amount of bubbles between the reflective layer 1 and the sheet material to be laminated after the reflective layer 1 is subsequently bonded, so as to improve the reliability of the gap reflective film.

[0052] S103: A reflective layer is attached to the surface of the adhesive layer.

[0053] In this step, the prepared reflective layer 1 is applied to the position of the printed adhesive layer 2. When a thermosetting adhesive is used to prepare the adhesive layer 2, high temperature can be directly used to assist the adhesive layer 2 to instantly cure, thereby completing the bonding.

[0054] S104: Disposing an insulating layer on the surface of the reflective layer.

[0055] In this step, a layer of insulating material, such as organic silicone insulating glue, can be sprayed or printed on the surface of the pasted reflective layer 1 as the insulating layer 3. In this step, it is usually necessary to ensure that the reflective layer 1 is completely covered by the insulating layer 3. When organic silicone is used as the insulating layer 3, the insulating layer 3 can be cured at high temperature after this step.

[0056] After this step, the preparation process of the photovoltaic module can be continued, such as laying the front plate, laying the front adhesive film, placing the battery string in a fixed position, covering the back adhesive film, and covering the back plate with the gap reflective film on the front, laminating, framing, and installing the junction box to complete the assembly of the photovoltaic module. The specific preparation process of the photovoltaic module can refer to the existing technology and will not be repeated here.

[0057] Embodiment 3

[0058] Please refer to Figure 3 , Figure 3 This is a flow chart of a second method for setting a gap reflective film provided in an embodiment of the utility model.

[0059] See also Figure 3 In this embodiment, the method for setting the gap reflective film includes:

[0060] S201: Calendering the metal substrate to form a microstructure on the surface of the metal substrate to form a reflective layer.

[0061] In this step, a corresponding microstructure is usually pressed out on the metal substrate using a pressing roller with a preset pattern engraved on the surface. For example, a corresponding triangular prism structure is pressed out on the metal substrate using a pressing roller engraved with a triangular prism shape to form a reflective layer 1.

[0062] S202: coating an insulating material on the surface of the reflective layer to form an insulating layer.

[0063] In this step, before preparing the photovoltaic module, an insulating material such as organic silicon insulating glue can be coated on the surface of the reflective layer 1, and an insulating layer 3 can be formed on the surface of the reflective layer 1. When organic silicon is used as the insulating layer 3, the insulating layer 3 can be formed by high temperature auxiliary curing. In this step, it is usually necessary to ensure that the surface of the reflective layer 1 on which the insulating layer 3 is provided is completely covered by the insulating layer 3, and then the reflective layer 1 provided with the insulating layer 3 is cut into rolls according to fixed specifications for standby use.

[0064] S203: Printing an adhesive material as an adhesive layer in a preset area of ​​the sheet material to be laminated.

[0065] S204: A reflective layer is attached to the surface of the adhesive layer.

[0066] The above S203 and S204 are basically consistent with S102 to S103 in the above embodiment, and the details have been described in detail in the above utility model embodiment, which will not be repeated here.

[0067] After this step, the preparation process of the photovoltaic module can be continued, such as laying the front plate, laying the front adhesive film, placing the battery string in a fixed position, covering the back adhesive film, and covering the back plate with the gap reflective film on the front, laminating, framing, and installing the junction box to complete the assembly of the photovoltaic module. The specific preparation process of the photovoltaic module can refer to the existing technology and will not be repeated here.

[0068] Embodiment 4

[0069] A photovoltaic assembly provided by an embodiment of the utility model is introduced below. The photovoltaic assembly described below and the gap reflective film described above can be referred to each other.

[0070] In this embodiment, the photovoltaic module includes a gap reflective film provided by any of the above-mentioned utility model embodiments, and a front plate, an upper layer of adhesive film, a battery cell, a lower layer of adhesive film and a back plate stacked in sequence along the thickness direction, and the gap reflective film is arranged in a blank area outside the battery cell. The specific structure of the gap reflective film has been described in detail in the above-mentioned utility model embodiments, and will not be described in detail here. The remaining structures of the radio frequency transmission system, such as the front plate, the upper layer of adhesive film, the battery cell, the lower layer of adhesive film and the back plate, can refer to the prior art and will not be described in detail here. In this embodiment, the gap reflective film is specifically arranged in the blank area outside the battery cell, which generally includes the area between adjacent battery cells and the area from the battery cell to the edge of the photovoltaic module, so as to reflect the light irradiated to the blank area to the battery cell.

[0071] Since the photovoltaic module provided in this embodiment specifically uses the gap reflective film provided in the above embodiments, the photovoltaic module has higher reliability.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0074] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0075] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0076] The above is a detailed introduction to a gap reflective film and photovoltaic module provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A gap reflective film, characterized in that: It includes an insulating layer, a reflective layer and an adhesive layer which are arranged in sequence; The reflective layer includes a metal substrate and a microstructure arranged on the surface of the metal substrate, wherein the microstructure is a microstructure formed by rolling on the surface of the metal substrate, and the microstructure and the metal substrate are an integrated structure; The adhesive layer is used to adhere to the plate material to be laminated, and the insulating layer covers the surface of the reflective layer on the side facing away from the adhesive layer.

2. The gap reflective film according to claim 1, characterized in that: The metal substrate is an aluminum sheet or a tin-lead alloy sheet.

3. The gap reflective film according to claim 1, characterized in that: The microstructure includes triangular prism-shaped protrusions.

4. The gap reflective film according to claim 3, characterized in that: The cross section of the triangular prism-shaped protrusion is an isosceles triangle, and the angle of the top angle of the triangular prism-shaped protrusion ranges from 90° to 150°; the height of the triangular prism-shaped protrusion ranges from 5μm to 12μm; and the angle between the axis of the triangular prism-shaped protrusion and the extension direction of the reflective layer ranges from 10° to 60°.

5. The gap reflective film according to claim 1, characterized in that: The insulating layer is an organic insulating silica gel layer.

6. The gap reflective film according to claim 5, characterized in that: The thickness of the organic insulating silica gel layer ranges from 10 μm to 50 μm.

7. The gap reflective film according to claim 1, characterized in that: The bonding layer is a thermosetting adhesive bonding layer.

8. The gap reflective film according to claim 7, characterized in that: The thickness of the thermosetting adhesive layer ranges from 5 μm to 20 μm.

9. The interstitial reflective film according to claim 7, characterized in that: The material of the thermosetting adhesive layer is the same as that of the insulating layer.

10. A photovoltaic module, characterized in that: It comprises the gap reflective film as claimed in any one of claims 1 to 9, and a front plate, an upper adhesive film, a battery cell, a lower adhesive film and a back plate stacked in sequence along the thickness direction, wherein the gap reflective film is arranged in a blank area outside the battery cell.

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