A photovoltaic module

Abstract

The application provides a photovoltaic module, which comprises a first adhesive film, a spacer, a cell string and a second adhesive film. The cross-linking rate of the material of the second adhesive film is greater than that of the first adhesive film. The cell string is located between the first adhesive film and the second adhesive film. The first adhesive film, the cell string and the second adhesive film are sequentially arranged along the thickness direction of the photovoltaic module. The spacer is located around the cell string and between the first adhesive film and the second adhesive film. The material of the spacer is the same as that of the first adhesive film. After the photovoltaic module is laminated, the thicknesses of the first adhesive film, the second adhesive film and the spacer gradually decrease along the direction close to the edge of the photovoltaic module. The spacer can reduce the possibility of generating bubbles and cavities when the photovoltaic module is laminated, and can improve the quality of the photovoltaic module.

Description

Technical Field

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

[0002] Photovoltaic encapsulant film is a crucial component of photovoltaic (PV) modules. It serves to bond solar cells to glass and the backsheet, protect and support the cells, and possesses a certain degree of light transmittance, ensuring that light can pass through the encapsulant film to illuminate the cells for photoelectric conversion. Currently, the main materials for PV encapsulant film include EVA and POE. POE film offers better aging resistance and lower moisture transmittance compared to EVA film, but it is more expensive. To control the cost of PV modules, a hybrid approach using EVA and POE films has been adopted. However, due to the difference in crosslinking rates between the two films, air bubbles and cavities can easily form in the film during lamination, affecting the product quality of the PV module. Summary of the Invention

[0003] In view of this, this application provides a photovoltaic module to solve the problem of air bubbles and cavities easily generated during the lamination of photovoltaic modules in the prior art.

[0004] This application provides a photovoltaic module, the photovoltaic module comprising:

[0005] First adhesive film;

[0006] The second adhesive film has a crosslinking rate greater than that of the material of the first adhesive film;

[0007] A battery string, along the thickness direction of the photovoltaic module, is located between the first encapsulant film and the second encapsulant film, and the area of ​​the battery string is smaller than the area of ​​the first encapsulant film and the second encapsulant film;

[0008] A spacer strip is provided, wherein the first adhesive film, the battery string, and the second adhesive film are arranged sequentially along the thickness direction of the photovoltaic module, the spacer strip is located around the battery string, the spacer strip is located at the edge of the first adhesive film and the second adhesive film, and is located between the first adhesive film and the second adhesive film;

[0009] The material of the spacer strip is the same as that of the first adhesive film. When the photovoltaic module is laminated, the thickness of the first adhesive film, the second adhesive film and the spacer strip gradually decrease along the length of the photovoltaic module towards the edge of the photovoltaic module.

[0010] In one possible implementation, the overall thickness of the first adhesive film, the second adhesive film, and the spacer strip is H, and the thickness of the first adhesive film and the spacer strip is H1. At a position at a distance greater than or equal to 3 mm from the edge of the photovoltaic module, H1 / H ≥ 24% is satisfied.

[0011] In one possible implementation, the width of the pad strip is L, and L satisfies 20mm≤L≤30mm.

[0012] In one possible implementation, the first adhesive film and the gasket are made of POE, and the second adhesive film is made of EVA.

[0013] In one possible implementation, the basis weight of the pad strip is 150–400 g / m². 2 The thickness of the pad strip is 0.1 to 0.4 mm.

[0014] In one possible implementation, the basis weight of the first adhesive film and the second adhesive film is 300–500 g / m³. 2 The thickness of the first adhesive film and the second adhesive film is 0.25 to 0.55 mm.

[0015] In one possible implementation, the photovoltaic module includes a plurality of spacers surrounding the battery string, the spacers being located on the side of the battery string closer to the first encapsulant film or on the side of the battery string closer to the second encapsulant film.

[0016] In one possible implementation, the first adhesive film and the pad strip are integrally formed.

[0017] In one possible implementation, the pad and the first adhesive film have the same thickness.

[0018] In one possible implementation, the photovoltaic module further includes a front panel and a back panel, wherein the first encapsulant film, the battery string, the spacer strip, and the second encapsulant film are located between the front panel and the back panel, and the front panel and / or the back panel are made of glass.

[0019] This application provides a photovoltaic module, which includes a first encapsulating film, a spacer strip, a battery string, and a second encapsulating film. The crosslinking rate of the material of the second encapsulating film is greater than that of the material of the first encapsulating film. The battery string is located between the first encapsulating film and the second encapsulating film, and the area of ​​the battery string is smaller than the area of ​​the first encapsulating film and the second encapsulating film. The first encapsulating film, the battery string, and the second encapsulating film are arranged sequentially along the thickness direction of the photovoltaic module. The spacer strip is located around the battery string, at the edge of the first encapsulating film and the second encapsulating film, and between the first encapsulating film and the second encapsulating film. The material of the spacer strip is the same as that of the first encapsulating film. When the photovoltaic module is laminated, the thickness of the first encapsulating film, the second encapsulating film, and the spacer strip gradually decreases along the direction close to the edge of the photovoltaic module in the length direction of the photovoltaic module. By setting the spacer strip, the possibility of generating bubbles and cavities during the lamination of the photovoltaic module can be reduced, thereby improving the quality of the photovoltaic module. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An exploded view of one embodiment of the photovoltaic module provided in this application;

[0022] Figure 2 A cross-sectional view of one embodiment of the photovoltaic module provided in this application;

[0023] Figure 3 A partial cross-sectional view of the laminated photovoltaic module provided in this application;

[0024] Figure 4 Graphs showing test data with and without spacers;

[0025] Figure 5 This is a schematic diagram of one embodiment of the pad provided in this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-First adhesive film;

[0028] 2-Second adhesive film;

[0029] 3-Push strip;

[0030] 4- Battery string;

[0031] 5-front plate;

[0032] 6-Back panel. Detailed Implementation

[0033] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0035] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0037] Photovoltaic encapsulant film is a crucial encapsulation material for photovoltaic modules, used to protect and connect the cells. Specifically, the film's function is to bond the cells while simultaneously protecting them and isolating them from air. In actual manufacturing, due to the continuously rising price of encapsulant film, and considering the overall cost and performance of photovoltaic modules, current methods often employ a mixture of two different encapsulant films to control costs. However, different types of encapsulant films have different cross-linking rates. During lamination, the film with a slower cross-linking rate is not fully cross-linked and is therefore easily extruded, resulting in voids or air bubbles within the final film, ultimately affecting product quality.

[0038] like Figures 1 to 3As shown in the illustration, this application provides a photovoltaic module, which includes a first encapsulating film 1, a second encapsulating film 2, a spacer strip 3, and a battery string 4. The crosslinking rate of the material of the second encapsulating film 2 is greater than that of the material of the first encapsulating film 1. The battery string 4 is located along the thickness direction of the photovoltaic module, between the first encapsulating film 1 and the second encapsulating film 2, and the area of ​​the battery string 4 is smaller than the area of ​​the first encapsulating film 1 and the second encapsulating film 2. The first encapsulating film 1, the battery string 4, and the second encapsulating film 2 are arranged sequentially along the thickness direction of the photovoltaic module. The spacer strip 3 is located around the battery string 4, at the edges of the first encapsulating film 1 and the second encapsulating film 2, and between the first encapsulating film 1 and the second encapsulating film 2. The material of the spacer strip 3 is the same as that of the first encapsulating film 1. After the photovoltaic module is laminated, the thickness of the first encapsulating film 1, the second encapsulating film 2, and the spacer strip 3 gradually decreases along the length direction of the photovoltaic module towards the edge of the photovoltaic module.

[0039] The photovoltaic module provided in this application has a novel lamination structure. A spacer strip 3 is disposed between the first encapsulant film 1 and the second encapsulant film 2. The first encapsulant film 1 and the second encapsulant film 2 are made of two different materials, which facilitates control of the overall cost of the photovoltaic module. The first encapsulant film 1 and the second encapsulant film 2 are respectively located on both sides of the battery string 4, used to connect the battery string 4 to other structures of the photovoltaic module and to protect the battery string 4. The spacer strip 3 can be disposed around the battery string 4 or disposed parallel to both sides of the battery string 4, and the spacer strip 3 is also located between the first encapsulant film 1 and the second encapsulant film 2. When the temperature is low, the cross-linking reaction of the first encapsulant film 1 and the second encapsulant film 2 is very slow, and the curing time is long. Therefore, during lamination, the first encapsulant film 1, the second encapsulant film 2, and the spacer strip 3 need to be heated to a suitable temperature. When the temperature rises, the first encapsulant film 1, the second encapsulant film 2, and the spacer strip 3 can have a certain fluidity and undergo a curing reaction. As the reaction proceeds, the first encapsulant film 1, the second encapsulant film 2, and the spacer strip 3 eventually lose their fluidity, achieving the encapsulation function. The encapsulant material may contain a crosslinking agent. During the crosslinking process, the crosslinking agent decomposes and generates gas, leading to air bubbles. Furthermore, pressure is applied to the photovoltaic module during lamination. Because the crosslinking rate of the first encapsulant film 1 is lower than that of the second encapsulant film 2, a portion of the first encapsulant film 1 is squeezed out of the photovoltaic module, resulting in cavities. The photovoltaic module provided in this embodiment includes a spacer strip 3, which serves to supplement the first encapsulant film 1. Even when a portion of the first encapsulant film 1 is being laminated, parts of the first encapsulant film 1, spacer strip 3, and second encapsulant film 2 are squeezed out. The thickness of all three gradually decreases towards the edge of the photovoltaic module, forming a structure where the overall thickness of the encapsulant film gradually decreases towards the edge of the photovoltaic module. Because the first encapsulant film 1 has a slower crosslinking rate, more of it is squeezed out of the photovoltaic module. The spacer strip 3 supplements the squeezed-out portion of the first encapsulant film 1, reducing the possibility of cavities and air bubbles during photovoltaic module lamination and improving the quality of the photovoltaic module.

[0040] like Figure 2 As shown, in one possible implementation, the overall thickness of the first adhesive film 1, the second adhesive film 2, and the spacer strip 3 is H, and the thickness of the first adhesive film 1 and the spacer strip 3 is H1. At a position where the distance from the edge of the photovoltaic module is greater than or equal to 3mm, H1 / H ≥ 24% is satisfied.

[0041] The thicknesses of the first adhesive film 1 and the second adhesive film 2 provided in this embodiment are proportional to the thickness of the spacer strip 3. By setting a reasonable proportional relationship, the spacer strip 3 can reduce the generation of air bubbles and cavities without affecting the lamination of the photovoltaic module. If the thickness of the spacer strip 3 is too large, it will lead to material waste, which will increase costs and is not conducive to the lamination of the photovoltaic module. If the thickness of the spacer strip 3 is too small, it will not be able to fully perform its filling function, causing the first adhesive film 1 with a slower crosslinking rate to be squeezed out, generating cavities or air bubbles, which will affect the product quality of the photovoltaic module. The photovoltaic module provided in this application embodiment has a thickness of 3mm from the edge of the photovoltaic module after lamination. The sum of the thicknesses of the first adhesive film 1 and the spacer strip 3 is greater than or equal to 24% of the total thickness of the first adhesive film 1, the second adhesive film 2 and the spacer strip 3. By setting H1 / H≥24%, the photovoltaic module still has sufficient cross-linking between the first adhesive film 1 and the spacer strip 3 and the second adhesive film 2 after lamination, forming a good connection and sealing effect for the battery string. The spacer strip 3 achieves a full filling effect, reducing the possibility of air bubbles and cavities during lamination and improving the quality of the photovoltaic module.

[0042] like Figure 1 As shown, in one possible implementation, the width of the pad 3 is L, and L satisfies 20mm≤L≤30mm.

[0043] The spacer strip 3 can be rectangular in shape. It can be symmetrically positioned along the edges of two parallel sides of the photovoltaic module, or it can be positioned on all four sides of the photovoltaic module, i.e., the spacer strip 3 surrounds the cell string 4. The width of the spacer strip 3 affects its size and its effective range. A reasonable width ensures good filling performance; if the width is too small, the filling effect will be compromised; if the width is too large, it will hinder cost reduction.

[0044] In one possible implementation, the first adhesive film 1 and the pad 3 are made of POE, and the second adhesive film 2 is made of EVA.

[0045] Currently, commonly used photovoltaic encapsulants include ethylene-vinyl acetate copolymer (EVA) and polyolefin thermoplastic elastomer (POE). Both EVA and POE films can be used for encapsulating single-glass and double-glass photovoltaic modules, but POE films have several performance advantages. Firstly, in terms of volume resistivity, the volume resistivity of EVA films decreases rapidly with increasing temperature, while the volume resistivity of POE films is much higher than that of EVA films at high temperatures. Furthermore, POE is a non-polar material and cannot form hydrogen bonds with water molecules, unlike EVA which adsorbs water vapor. Its water vapor permeability is also much lower than that of EVA. Due to the saturated structure of the POE macromolecular chain, the molecular structure contains relatively fewer tertiary carbon atoms, thus POE exhibits superior heat aging resistance and UV resistance compared to EVA. However, in actual production, the price of POE has been continuously rising, leading to the design of photovoltaic modules using a mixed encapsulation method that combines POE and EVA to ensure product performance while controlling costs. The pad 3 provided in this embodiment is made of POE. Because the crosslinking rate of POE is lower than that of EVA, POE is more easily extruded during lamination, leading to a reduction in POE material. By setting the pad 3 to be made of POE, this application can replenish the POE film material, reducing the possibility of air bubbles or voids caused by POE extrusion and improving product quality. The material of the pad 3 can also be other materials. The pad 3 uses a material with a lower crosslinking rate, which can achieve the effect of replenishing the material with a slower crosslinking rate during the lamination process. The materials of the first film 1 and the second film 2 can also be selected from materials other than EVA and POE, such as polyvinyl butyral film (PVB). The material of the pad 3 is adjusted accordingly based on the materials of the first film 1 and the second film 2 to achieve the function of replenishing the extruded material.

[0046] like Figure 4The chart shows a comparison of test data with and without spacer strip 3. The dashed line represents the data trend with spacer strip 3, and the solid line represents the data trend without spacer strip 3. The horizontal axis represents the distance of the test point from the edge of the photovoltaic module, and the right vertical axis represents the proportion of POE thickness. The dashed and solid lines represent the proportions of POE thickness in the total thickness of the first encapsulant film 1, the second encapsulant film 2, and spacer strip 3 after lamination, respectively. The dashed line is above the solid line, indicating that the proportion of POE increases after spacer strip 3 is added. Since spacer strip 3 is made of POE, it means that spacer strip 3 was not completely extruded during lamination, thus achieving a filling effect and supplementing the POE material, reducing the possibility of cavities and air bubbles during lamination. The left vertical axis of the chart represents the increase in POE thickness, and the height of the bars represents the specific value of the increase. In all test locations shown in the chart, the POE thickness increases to some extent, and the increase in POE thickness generally shows a gradual increasing trend with increasing distance from the edge of the photovoltaic module. In summary, by setting the spacer strip 3, the POE can be supplemented, thereby reducing the possibility of air bubbles and cavities generated during lamination and improving the quality of photovoltaic modules.

[0047] In one possible implementation, the basis weight of the pad strip 3 is 150–400 g / m². 2 The thickness of the pad 3 is 0.1 to 0.4 mm.

[0048] The basis weight of the spacer strip 3 affects the thickness, strength, and light transmittance of the encapsulant film. A lower basis weight can reduce the overall weight of the photovoltaic module, reducing the burden of transportation and installation, while also improving the light transmittance and operating efficiency of the photovoltaic module. The basis weight of the encapsulant film can be controlled by adjusting the thickness of the spacer strip 3. Before lamination, the thickness of the spacer strip 3 is 0.15–0.45 mm. After lamination, the spacer strip 3 undergoes a certain degree of deformation and cross-links with the first encapsulant film 1 and the second encapsulant film 2, resulting in a slight reduction in the thickness of the spacer strip 3 after lamination, which is 0.1–0.4 mm. In this embodiment, by selecting a spacer strip 3 with an appropriate basis weight, the performance of the photovoltaic module can be improved and the cost reduced.

[0049] In one possible implementation, the basis weight of the first adhesive film 1 and the second adhesive film 2 is 300–500 g / m². 2 The thickness of the first adhesive film 1 and the second adhesive film 2 is 0.25 to 0.55 mm.

[0050] Similar to the principle of spacer strip 3, the basis weight of the first encapsulant film 1 and the second encapsulant film 2 also affects the performance and cost of photovoltaic modules. Furthermore, the effective area of ​​the first and second encapsulant films 1 and 2 is larger than that of spacer strip 3, therefore, the first and second encapsulant films 1 and 2 have a greater impact on photovoltaic modules. Before lamination, the thickness of the first and second encapsulant films 1 and 2 is 0.3–0.6 mm. After lamination, their thickness decreases to 0.25–0.55 mm. Selecting appropriate basis weights for the first and second encapsulant films 1 and 2 facilitates control over performance and cost.

[0051] In one possible implementation, the photovoltaic module includes a plurality of spacers 3 surrounding the battery string 4, with the spacers 3 located on the side of the battery string 4 near the first encapsulant film 1 or on the side of the battery string 4 near the second encapsulant film 2.

[0052] The position of the spacer strip 3 relative to the battery string 4 can be flexibly set according to actual needs, and multiple spacer strips 3 can be set on the photovoltaic module. The spacer strips 3 can be set at the head and tail of the battery string 4, and the spacer strips 3 are parallel to each other. The spacer strips 3 can also be set around the battery string 4, with the spacer strips 3 set around the battery string 4 parallel to the four sides of the corresponding photovoltaic module. By setting multiple spacer strips 3, more complete filling can be achieved, and different positions of the photovoltaic module can be filled separately, reducing the possibility of air bubbles and cavities in different positions of the photovoltaic module, thus improving the stability of product quality.

[0053] like Figure 5 As shown, in one possible implementation, the first adhesive film 1 and the pad strip 3 are integrally formed.

[0054] The first adhesive film 1 is made of an elastic material, allowing it to deform to a certain extent. When setting the first adhesive film 1, its area is appropriately increased. Before lamination and stacking, the edges of the first adhesive film 1 are folded over, giving it a partially double-layered structure. The folded portion becomes the spacer strip 3, achieving an integral molding of the first adhesive film 1 and the spacer strip 3. Integrating the first adhesive film 1 and the spacer strip 3 reduces processing costs.

[0055] In one possible implementation, the pad 3 and the first adhesive film 1 have the same thickness.

[0056] When the first adhesive film 1 and the spacer strip 3 are integrally formed, a portion of the first adhesive film 1 is folded over to form the spacer strip 3. Therefore, the thickness of the spacer strip 3 is the same as the thickness of the first adhesive film 1. The first adhesive film 1 and the spacer strip 3 overlap each other along the thickness direction of the photovoltaic module. During lamination, the spacer strip 3 has sufficient thickness to fully achieve the filling effect, supplement the first adhesive film 1 that is squeezed out during lamination, reduce the possibility of generating air bubbles and cavities in the photovoltaic module, and improve product quality.

[0057] In one possible implementation, the photovoltaic module further includes a front panel 5 and a back panel 6, with a first encapsulant film 1, a battery string 4, a spacer strip 3, and a second encapsulant film 2 located between the front panel 5 and the back panel 6, and the front panel 5 and / or the back panel 6 being made of glass.

[0058] The front panel 5 and back panel 6 are located on opposite sides of the photovoltaic module, protecting and supporting its internal structure. When the photovoltaic module is installed on the ground or roof, the front panel 5 is located away from the ground or roof. Therefore, the front panel 5 is made of glass with good light transmittance. Sunlight passing through the front panel 5 can act on the cell string 4, thereby achieving photoelectric conversion and ensuring high efficiency of the photovoltaic module. The back panel 6 is located on the side of the photovoltaic module that is relatively away from sunlight. The back panel 6 can be made of opaque material or light-transmitting material. When both the back panel 6 and the front panel 5 of the photovoltaic module are made of glass, the photovoltaic module is a double-glass module. In addition to receiving sunlight on the front side, the back panel 6 is also translucent. Sunlight reflected onto the back of the photovoltaic module can also be utilized through the back panel 6, thereby improving the overall efficiency of the photovoltaic module.

[0059] This application provides a photovoltaic module, which includes a first encapsulating film 1, a spacer strip 3, a battery string 4, and a second encapsulating film 2. The cross-linking rate of the material of the second encapsulating film 2 is greater than that of the material of the first encapsulating film 1. The battery string 4 is located between the first encapsulating film 1 and the second encapsulating film 2. The first encapsulating film 1, the battery string 4, and the second encapsulating film 2 are arranged sequentially along the thickness direction of the photovoltaic module. The spacer strip 3 is located around the battery string 4 and between the first encapsulating film 1 and the second encapsulating film 2. The material of the spacer strip 3 is the same as that of the first encapsulating film 1. When the photovoltaic module is laminated, the thickness of the first encapsulating film 1, the second encapsulating film 2, and the spacer strip 3 gradually decreases along the direction close to the edge of the photovoltaic module in the length direction of the photovoltaic module. By setting the spacer strip 3, the possibility of generating bubbles and cavities during the lamination of the photovoltaic module can be reduced, thereby improving the quality of the photovoltaic module.

[0060] The above description of the structure, features and effects of this application is based on the embodiments shown in the drawings. The above are only preferred embodiments of this application. However, this application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of this application, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, should be within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: First adhesive film (1); The crosslinking rate of the material of the second adhesive film (2) is greater than that of the material of the first adhesive film (1); The battery string (4) is located between the first adhesive film (1) and the second adhesive film (2) along the thickness direction of the photovoltaic module, and the area of ​​the battery string (4) is smaller than the area of ​​the first adhesive film (1) and the second adhesive film (2). The spacer (3), the first adhesive film (1), the battery string (4) and the second adhesive film (2) are arranged sequentially along the thickness direction of the photovoltaic module. The spacer (3) is located around the battery string (4). The spacer (3) is located at the edge of the first adhesive film (1) and the second adhesive film (2) and is located between the first adhesive film (1) and the second adhesive film (2). The material of the pad (3) is the same as that of the first adhesive film (1). When the photovoltaic module is laminated, the thickness of the first adhesive film (1), the second adhesive film (2) and the pad (3) gradually decrease along the direction close to the edge of the photovoltaic module in the length direction of the photovoltaic module.

2. The photovoltaic module according to claim 1, characterized in that, The overall thickness of the first adhesive film (1), the second adhesive film (2) and the pad (3) is H, and the thickness of the first adhesive film (1) and the pad (3) is H1. At a position where the distance from the edge of the photovoltaic module is greater than or equal to 3mm, H1 / H ≥ 24% is satisfied.

3. The photovoltaic module according to claim 1, characterized in that, The width of the pad (3) is L, and L satisfies 20mm≤L≤30mm.

4. The photovoltaic module according to claim 1, characterized in that, The first adhesive film (1) and the pad strip (3) are made of POE, and the second adhesive film (2) is made of EVA.

5. The photovoltaic module according to claim 4, characterized in that, The basis weight of the pad strip (3) is 150-400 g / m. 2 The thickness of the pad (3) is 0.1 to 0.4 mm.

6. The photovoltaic module according to claim 4, characterized in that, The basis weight of the first adhesive film (1) and the second adhesive film (2) is 300-500 g / m³. 2 The thickness of the first adhesive film (1) and the second adhesive film (2) is 0.25 to 0.55 mm.

7. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module includes a plurality of spacers (3) surrounding the battery string (4). The spacers (3) are located on the side of the battery string (4) near the first adhesive film (1) or on the side of the battery string (4) near the second adhesive film (2).

8. The photovoltaic module according to claim 1, characterized in that, The first adhesive film (1) and the pad strip (3) are integrally formed.

9. The photovoltaic module according to claim 1, characterized in that, The pad strip (3) and the first adhesive film (1) have the same thickness.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that, The photovoltaic module also includes a front panel (5) and a back panel (6). The first adhesive film (1), the battery string (4), the spacer strip (3) and the second adhesive film (2) are located between the front panel (5) and the back panel (6). The front panel (5) and / or the back panel (6) are made of glass.

Images