Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic technical field, and provides a photovoltaic module to reduce the possibility of cell cracks of the photovoltaic module in the process of lamination and transportation as much as possible, thereby improving product quality. The photovoltaic module comprises a first adhesive film, a cell string and a second adhesive film which are arranged in a stack; wherein the cell string comprises a plurality of cells arranged in an array; at least one of the first adhesive film and the second adhesive film comprises a plurality of adhesive film units connected with each other; each adhesive film unit comprises a first part and a second part arranged around the first part, the first part is arranged corresponding to the cell, and the second part is arranged corresponding to a position of a gap around the cell; the thickness of the second part is greater than the thickness of the first part, and at least part of the surface of the second part away from the cell protrudes from the surface of the first part away from the cell.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure relates to the technical field of photovoltaic, in particular to a photovoltaic module. BACKGROUND

[0002] Photovoltaic power generation converts solar energy into electric energy through a photovoltaic module, thereby providing a green, environmentally friendly and renewable energy production method, which has been widely used in many fields. The photovoltaic module includes a plurality of cell pieces. In order to protect the cell pieces, a film is generally arranged on both sides of the cell pieces. However, the working reliability of the film is poor at present. In the process of lamination and transportation, the cell pieces are prone to hidden cracking, thereby reducing the product quality. SUMMARY

[0003] The embodiment of the present disclosure provides a photovoltaic module to reduce the possibility of hidden cracking of the cell pieces of the photovoltaic module in the process of lamination and transportation as much as possible, thereby improving the product quality.

[0004] According to some embodiments of the present disclosure, the embodiment of the present disclosure provides a photovoltaic module, which includes a first film, a cell string and a second film arranged in layers.

[0005] The cell string includes a plurality of cell pieces arranged in an array. At least one of the first film and the second film includes a plurality of connected film units. Each film unit includes a first part and a second part arranged around the first part. The first part is arranged corresponding to the cell pieces, and the second part is arranged corresponding to the position of the gap around the cell pieces. The thickness of the second part is greater than the thickness of the first part, and the second part protrudes from the surface of the first part away from the cell pieces.

[0006] According to some embodiments of the present disclosure, in the film unit, the thickness of the part of the second part protruding from the surface of the first part away from the cell pieces increases along a first direction from close to the first part to away from the first part.

[0007] According to some embodiments of the present disclosure, in the film unit, the surface of the second part away from the cell pieces is a straight surface or an arc surface.

[0008] According to some embodiments of the present disclosure, in the film unit, the thickness of the part of the second part protruding from the surface of the first part away from the cell pieces is the same.

[0009] According to some embodiments of the present disclosure, in the film unit, the surface of the second part away from the cell pieces is a stepped surface.

[0010] According to some embodiments of the present disclosure, in the adhesive film unit, the second part protrudes from the surface of the first part close to the surface of the battery piece.

[0011] According to some embodiments of the present disclosure, in the adhesive film unit, the second part comprises a first protruding subpart, a body subpart and a second protruding subpart arranged in a stack; the first protruding subpart protrudes from the surface of the first part away from the battery piece, the second protruding subpart protrudes from the surface of the first part close to the battery piece, and the first protruding subpart and the second protruding subpart are symmetrically arranged about the body subpart.

[0012] According to some embodiments of the present disclosure, in the adhesive film unit, the hardness of the second part is less than the hardness of the first part.

[0013] According to some embodiments of the present disclosure, in the adhesive film unit, the hardness of the part of the first part in contact with the battery piece is less than the hardness of the part of the first part not in contact with the battery piece.

[0014] According to some embodiments of the present disclosure, the second parts of adjacent adhesive film units are arranged in a joint manner, and the top corners of the second parts of the adhesive film units are chamfered structures.

[0015] The embodiments of the present disclosure provide a photovoltaic module. On the one hand, the thickness of the second part of the adhesive film unit is greater than the thickness of the first part, i.e., the thickness of the adhesive film at the position of the gap around the battery piece is greater than the thickness of the adhesive film at the position of the battery piece. Compared with the adhesive film with the same thickness in the related art, the photovoltaic module provided by the embodiments of the present disclosure enhances the supporting effect and the buffering effect of the second part by thickening the second part, thereby reducing the force acting on the edge of the battery piece during lamination and transportation. On the other hand, at least part of the surface of the second part away from the battery piece protrudes from the surface of the first part away from the battery piece. When an external force acts on the adhesive film unit, the external force (e.g., a pressing force) first acts on the part of the second part protruding from the surface of the first part away from the battery piece, and the part of the second part protruding from the surface of the first part away from the battery piece can also disperse the external force, thereby further reducing the force acting on the edge of the battery piece. The two factors cooperate with each other to reduce the force acting on the edge of the battery piece during lamination and transportation as much as possible, thereby greatly reducing the possibility of edge cracking of the battery piece, and further greatly improving the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example in the drawings and are described herein in connection with the embodiments described. These embodiments are not intended to limit the scope of embodiments to the embodiments described, but rather, these embodiments are intended to convey the principles of the embodiments to those of ordinary skill in the art. From these principles by applying knowledge within the skill of the art, each of the embodiments described herein and those made by those of ordinary skill in the art can be implemented in a variety of ways.

[0017] Figure 1 A structural schematic diagram of a photovoltaic module provided by the related art;

[0018] Figure 2 A structural schematic diagram of a photovoltaic module provided by the embodiments of the present disclosure;

[0019] Figure 3 A structural schematic diagram of a cell string provided by the embodiments of the present disclosure;

[0020] Figure 4 And Figure 5 Top views of two second adhesive films provided by the embodiments of the present disclosure;

[0021] Figures 6-16 A plurality of structural schematic diagrams of a photovoltaic module of a type provided by the embodiments of the present disclosure;

[0022] Figures 17-19 Structural schematic diagrams of three adhesive film units provided by the embodiments of the present disclosure;

[0023] Figures 20-31 A plurality of structural schematic diagrams of a photovoltaic module of another type provided by the embodiments of the present disclosure. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be described below in connection with the embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative work are within the scope of protection of the present disclosure.

[0025] In the description of the embodiments of the present disclosure, the meaning of "at least one" is one or more, and the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0026] In the description of the embodiments of the present disclosure, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0027] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of the present disclosure, the orientation or positional relationship indicated by the technical terms "thickness" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0029] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0030] In the corresponding drawings of the embodiments of the present disclosure, in order to better understand and facilitate the description, the thickness and area of the layer are enlarged.

[0031] In the description of the embodiments of the present disclosure, when a certain component "includes" another component, unless otherwise specified, other components can not be excluded, and other components can be further included. Above or on a first component, or on the surface of the first component, or on one side of the first component, a second component is formed or arranged, which can include an embodiment in which the first component and the second component are in direct contact, and can also include an embodiment in which additional components can be between the first component and the second component, so that the first component and the second component can not be in direct contact. For the sake of simplicity and clarity, various components can be arbitrarily drawn in different proportions. In the drawings, some layers / components can be omitted for simplicity. Unless otherwise specified, a second component formed or arranged on the surface of a first component means that the first component is in direct contact with the second component. Among them, the "component" mentioned above can refer to: layer, film, area, part, structure, etc.

[0032] Reference Figure 1 As shown in the related art, the thickness of the adhesive film on the upper and lower sides of the cell in a photovoltaic module provided by the related art is uniform. Considering the cost and thinness, the adhesive film cannot be too thick. In this way, during the lamination and transportation of the photovoltaic module, the edge of the cell is prone to hidden cracking, thereby reducing the product quality.

[0033] Based on this, the embodiments of the present disclosure provide a photovoltaic module, as shown in Figures 2-5 The photovoltaic module includes a first adhesive film 1, a cell string 2, and a second adhesive film 3 which are stacked.

[0034] As shown in Figure 3 The cell string 2 includes a plurality of cells 21 arranged in an array; at least one of the first adhesive film and the second adhesive film includes a plurality of connected adhesive film units; as shown in Figure 4 and Figure 5 Each adhesive film unit includes a first part 311 and a second part 312 arranged around the first part 311, as shown in Figure 2 The first part 311 is arranged corresponding to the cell 21, and the second part 312 is arranged corresponding to the position where the gap 4 around the cell is located; the thickness h2 of the second part 312 is greater than the thickness h1 of the first part 311, and the second part 312 protrudes from the surface of the first part 311 away from the cell 21. Figures 2-5 The second adhesive film 3 includes a plurality of connected adhesive film units 31 is taken as an example for illustration.

[0035] The plurality of battery pieces arranged in the array are provided with gaps at the periphery of each battery piece to facilitate the arrangement of components such as solder strips. The specific type of the battery piece is not limited, and examples include but are not limited to one or any combination of a PERC (Passivated Emitter Rear Cell) battery, an IBC (Interdigitated Back Contact) battery, a TOPCon (Tunnel Oxide Passivated Contact) battery, a HIT / HJT (Heterojunction Technology) battery, a solar thin-film battery, or a stacked battery. The solar thin-film battery includes but is not limited to a perovskite solar thin-film battery, a copper-indium-selenium solar thin-film battery, a gallium arsenide solar thin-film battery, or a cadmium sulfide solar thin-film battery. The stacked battery includes but is not limited to a perovskite battery stacked with a crystalline silicon battery, a perovskite battery stacked with a perovskite battery, or a perovskite battery stacked with a thin-film battery. The size of the battery piece is also not limited, and examples include a complete battery piece, a half battery piece, or a quarter battery piece.

[0036] At least one of the first adhesive film and the second adhesive film includes a plurality of connected adhesive film units, including three cases: first, as shown in Figure 6 、 Figure 9 、 Figure 12 and Figure 15 , the first adhesive film 1 includes a plurality of connected adhesive film units 11, and the thickness h4 of the second part 112 of the first adhesive film 1 is greater than the thickness h3 of the first part 111. At this time, the second adhesive film 3 can be an adhesive film layer arranged in a whole layer and having a uniform thickness; second, as shown in Figure 2 、 Figure 8 、 Figure 11 and Figure 14 , the second adhesive film 3 includes a plurality of connected adhesive film units 31, and the thickness h2 of the second part 312 of the second adhesive film 3 is greater than the thickness h1 of the first part 311. At this time, the first adhesive film 1 can be an adhesive film layer arranged in a whole layer and having a uniform thickness; third, as shown in Figure 7 、 Figure 10 、 Figure 13 and Figure 16 , the first adhesive film 1 and the second adhesive film 3 respectively include a plurality of connected adhesive film units. For ease of distinction, in the embodiments of the present disclosure and the accompanying drawings, the adhesive film units of the first adhesive film 1 are marked with 11, the first part of the adhesive film units 11 of the first adhesive film 1 is marked with 111, and the second part is marked with 112; the adhesive film units of the second adhesive film 3 are marked with 31, the first part of the adhesive film units 31 of the second adhesive film 3 is marked with 311, and the second part is marked with 312.

[0037] The material of the first part and the second part in the above-mentioned adhesive film unit can be the same or different, which is not limited herein. For example, in order to reduce the cost, the first part and the second part can be made of the same material, which can be Ethylene Vinyl Acetate Copolymer (EVA), Polyolefin Elastomer (POE), or PolyVinyl Butyral (PVB), etc. In the above-mentioned adhesive film unit, the thickness of the first part is uniform, and the thickness of the second part can be uniform or non-uniform, which is not limited herein.

[0038] The second part protrudes from the surface of the first part away from the surface of the battery sheet at least partially refers to that the second part protrudes from the surface of the first part away from the surface of the battery sheet entirely, or the second part protrudes from the surface of the first part away from the surface of the battery sheet partially, and the remaining surface can be flush with the surface of the first part away from the surface of the battery sheet. The shape of the surface of the second part away from the surface of the battery sheet is not limited herein, for example, the surface of the second part away from the surface of the battery sheet can be a straight surface as shown in FIG. 1A, an arc surface as shown in FIG. 1B, or a stepped surface as shown in FIG. 1C, etc. Figure 11 Figure 2 Figure 8 Figure 14 Figure 15

[0039] In the photovoltaic module provided by the embodiments of the present disclosure, on the one hand, the thickness of the second part in the adhesive film unit is greater than the thickness of the first part, that is, the thickness of the adhesive film at the position corresponding to the gap of the periphery of the battery sheet is greater than the thickness of the adhesive film at the position corresponding to the battery sheet, compared with the adhesive film with the same thickness in the related art, the photovoltaic module provided by the embodiments of the present disclosure thickens the second part to enhance the supporting effect and the buffering effect of the second part, thereby reducing the force acting on the edge of the battery sheet in the process of lamination and transportation. On the other hand, at least part of the surface of the second part away from the surface of the battery sheet protrudes from the surface of the first part away from the surface of the battery sheet, when an external force acts on the adhesive film unit, since at least part of the surface of the second part away from the surface of the battery sheet protrudes from the surface of the first part away from the surface of the battery sheet, the external force (for example, the extrusion force) first acts on the part of the second part protruding from the surface of the first part away from the surface of the battery sheet, and the part of the second part protruding from the surface of the first part away from the surface of the battery sheet can also disperse the external force, thereby further reducing the force acting on the edge of the battery sheet. The two factors cooperate with each other to reduce the force acting on the edge of the battery sheet in the process of lamination and transportation as much as possible, thereby greatly reducing the possibility of edge cracking of the battery sheet, and further greatly improving the product quality.

[0040] ​​​​​It should be noted that the photovoltaic modules described above may also include structures such as backsheets, frontsheets, and frames. Only the structures related to the inventive point are described here, and the other structures can be obtained from related technologies.

[0041] The following provides a structure for an adhesive film unit.

[0042] In one or more embodiments, to facilitate fabrication and further improve the buffering effect, refer to Figure 2 As shown, in the adhesive film unit 31 of the second adhesive film 3, the thickness of the portion of the second part 312 that protrudes from the first part 311 away from the surface of the battery cell 21 is along the first direction ( Figure 2 The AB direction (as shown) increases, with the first direction being the direction from closest to the first part to furthest from the first part; thus, the reference... Figure 2 As shown, when an external force F acts on the second part 312 of two adjacent film units 31, the two adjacent second parts 312 can disperse the external force F along direction a and direction b, thereby greatly reducing the force acting on the edge of the battery cell 21, further reducing the possibility of microcracks at the edge of the battery cell 21, and thus further improving product quality.

[0043] The thickness of the portion of the second part protruding from the surface of the first part away from the battery cell can increase linearly or non-linearly along the first direction; this is not limited here. If the thickness of the portion of the second part protruding from the surface of the first part away from the battery cell increases linearly along the first direction, then refer to... Figures 11-13 As shown, the surface of the second part of the film unit that faces away from the solar cell can be a flat surface; Reference Figure 11 As shown, the angle β between the straight surface and the surface of the first part 311 of the second adhesive film 3 that faces away from the surface of the battery cell 21 is an obtuse angle. The range of this obtuse angle is not limited, and it is related to the maximum thickness of the portion of the second part that protrudes from the surface of the first part facing away from the battery cell. The smaller the obtuse angle value, the greater the maximum thickness of the portion of the second part that protrudes from the surface of the first part facing away from the battery cell, and the better its effect of dispersing external forces. Conversely, the larger the obtuse angle value, the smaller the maximum thickness of the portion of the second part that protrudes from the surface of the first part facing away from the battery cell, which is more conducive to improving the flatness of the module while ensuring the effect of dispersing external forces. Therefore, a suitable obtuse angle value can be selected by comprehensively considering factors such as the effect of dispersing external forces and the flatness of the module. For example, the range of this obtuse angle value can be [140 degrees, 170 degrees], such as 140 degrees, 150 degrees, 160 degrees, or 170 degrees.

[0044] If the thickness of the second portion protruding from the surface of the first portion away from the battery cell increases non-linearly along the first direction, then the surface of the second portion away from the battery cell in the film unit can be an arc surface; the curvature of this arc surface can be as follows: Figure 2 , Figure 6 and Figure 7gradually increases, or as shown in FIG. 2B, gradually decreases, without limitation. Figures 8-10

[0045] Another structure of the film unit is provided below.

[0046] In one or more embodiments, in order to simplify the design and facilitate the manufacturing, the thickness of the second part protruding from the portion of the first part away from the surface of the battery piece is the same in the film unit.

[0047] It should be noted that the second part protruding from the portion of the first part away from the surface of the battery piece can be connected or not connected to the first part. Since the joint of the two film units needs stronger support, the structure in which the second part of the two film units protruding from the portion of the first part away from the surface of the battery piece is connected can be selected. At this time, referring to FIG. 2A, the second part 312 of the second film 3 protruding from the portion of the first part 311 away from the surface of the battery piece 21 is not connected to the first part 311, and the portion of the second part 312 not protruding from the portion of the first part 311 away from the surface of the battery piece 21 can be connected to and flushly arranged with the first part 311. Figure 14 Figure 15 In FIG. 1A, the structure of each film unit 11 of the first film 1 is the same as that of each film unit 31 of the second film 3. Figure 14 In FIG. 1A, the structure of each film unit 31 of the second film 3 is the same as that of each film unit 11 of the first film 1. Figure 16 In FIG. 1A, the structure of each film unit 11 of the first film 1 and each film unit 31 of the second film 3 is the same as that of each film unit 11 of the first film 1. Figure 14 In FIG. 1A, the structure of each film unit 31 of the second film 3 is the same as that of each film unit 11 of the first film 1.

[0048] In some embodiments, in order to further simplify the design and facilitate the manufacturing, referring to FIG. 2A, the surface of the second part away from the surface of the battery piece is a stepped surface. In this way, a part of the surface of the second part away from the surface of the battery piece is flushly arranged with the surface of the first part away from the surface of the battery piece, and another part of the surface of the second part away from the surface of the battery piece protrudes from the surface of the first part away from the surface of the battery piece. Figures 14-16

[0049] In the film unit of any of the above photovoltaic modules, the surface of the second part close to the battery piece can not protrude from the surface of the first part close to the battery piece, or referring to FIG. 2A, at least a part of the surface of the second part close to the battery piece protrudes from the surface of the first part close to the battery piece. In order to further increase the thickness of the second part and further increase the supporting effect and the buffering effect, the structure in which at least a part of the surface of the second part close to the battery piece can protrude from the surface of the first part close to the battery piece can be selected. In addition, a gap is arranged between adjacent battery pieces, and the part of the surface of the second part close to the battery piece protruding from the surface of the first part close to the battery piece can be arranged in the gap, without increasing the thickness of the module. Figure 2 Figures 6-16 In the film unit of any of the above photovoltaic modules, the surface of the second part close to the battery piece can not protrude from the surface of the first part close to the battery piece, or referring to FIG. 2A, at least a part of the surface of the second part close to the battery piece protrudes from the surface of the first part close to the battery piece. In order to further increase the thickness of the second part and further increase the supporting effect and the buffering effect, the structure in which at least a part of the surface of the second part close to the battery piece can protrude from the surface of the first part close to the battery piece can be selected. In addition, a gap is arranged between adjacent battery pieces, and the part of the surface of the second part close to the battery piece protruding from the surface of the first part close to the battery piece can be arranged in the gap, without increasing the thickness of the module.

[0050] ​​​​In some implementations, reference Figure 6 As shown, in the film unit 11, the second part 112 includes a first protruding sub-part 1121, a body sub-part 1120, and a second protruding sub-part 1122 stacked together. The first protruding sub-part 1121 protrudes from the surface of the first part 111 away from the surface of the battery cell 21, and the second protruding sub-part 1122 protrudes from the surface of the first part 111 near the surface of the battery cell 21. The first protruding sub-part 1121 and the second protruding sub-part 1122 are symmetrically arranged about the body sub-part 1120, which is more conducive to manufacturing and further improves the support and cushioning effect. Here, we take... Figure 6 The adhesive film unit 11 of the first adhesive film 1 shown is illustrated as follows: Figure 2 The second part 312 of the adhesive film unit 31 of the second adhesive film 3 shown in the figure, and Figure 6 The structure of the second part 112 of the adhesive film unit 11 of the first adhesive film 1 shown is the same.

[0051] In one or more embodiments, the second part of the adhesive film unit has a lower hardness than the first part, which is more conducive to improving the support and cushioning effect. Hardness depends on parameters such as thickness and material; therefore, the hardness relationship between the first and second parts can be satisfied by adjusting the thickness and material of the first and second parts respectively.

[0052] In one or more embodiments, to better protect the solar cells and provide a buffer for the solar cells as a whole, thereby further reducing the possibility of microcracks occurring at the edges of the solar cells, refer to... Figure 17 As shown, in the film unit, the hardness of the portion 3110 of the first part 311 that contacts the corresponding battery cell 21 is less than the hardness of the portion 3111 of the first part 311 that does not contact the corresponding battery cell 21. Here, we take... Figure 17 The following explanation uses the second adhesive film unit as an example. Similarly, Figure 19 The first part 111 of the adhesive film unit shown in the first adhesive film is... Figure 17 The first part 311 of the second adhesive film unit shown has the same hardness distribution. Here, Figure 17 The hardness of the portion 3110 that contacts the corresponding battery cell 21 in the first part 311 shown can be the same as the hardness of the second part 312.

[0053] In one or more embodiments, reference is made to Figure 4 and Figure 5 As shown, the second parts 312 of adjacent adhesive film units 31 are spliced ​​together, and the apex corner of the second part 312 of the adhesive film unit has a chamfered structure. This chamfered structure can be as follows: Figure 5 The rounded corner structure shown, or it could also be as follows: Figure 4 The chamfered right angle structure shown can, of course, be other chamfered structures; no limitation is made here. Here, we use... Figure 4 andFigure 5 The second adhesive film shown is illustrated using the adhesive film unit as an example. Of course, the structure of the adhesive film unit included in the first adhesive film is the same as the structure of the adhesive film unit included in the second adhesive film.

[0054] The aforementioned film units are arranged separately, and the apex corner of the second part is formed as follows: Figure 4 and Figure 5 The perforated hole 310 shown provides deformation space for the film unit; thus, when the film unit is compressed, it can release some of the stress through deformation, thereby further reducing the force applied to the edge of the cell, thereby further reducing the possibility of microcracks at the edge of the cell and further improving product quality.

[0055] The following is about Figure 2 , Figures 6-16 The photovoltaic modules shown are described in detail.

[0056] refer to Figure 2 As shown, in this photovoltaic module, the first encapsulant film 1 is a single, uniform layer. The second encapsulant film 3 includes multiple interconnected encapsulant film units 31. Each encapsulant film unit includes a first part 311 and a second part 312 surrounding the first part 311. The first part 311 is positioned corresponding to the solar cell 21, and the second part 312 is positioned corresponding to the gap 4 around the solar cell. The thickness h2 of the second part 312 is greater than the thickness h1 of the first part 311, and the entire surface of the second part 312 facing away from the solar cell 21 protrudes beyond the surface of the first part 311 facing away from the solar cell 21. Both the surface of the second part 312 facing away from the solar cell 21 and the surface of the second part 312 approaching the solar cell 21 are curved surfaces, and the curvature of both curved surfaces gradually increases along the AB direction. In this photovoltaic module, the thickness h2 of the second part 312 is not uniform.

[0057] Figure 2 In the photovoltaic module shown, the specific ranges of the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 are not limited. For example, if the thickness h1 of the first part 311 is less than 0.35mm, the adhesion of the first part 311 after lamination will be weak; while if the thickness h1 of the first part 311 is greater than 0.45mm, it will affect the light transmittance of the first part 311 and increase the cost. Therefore, the value range of the thickness h1 of the first part 311 can be [0.35mm, 0.45mm]. For example, the thickness h1 of the first part 311 can be 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm or 0.45mm, etc.

[0058] refer to Figure 2As shown, in order to reduce the influence on the flatness of the assembly, while improving the supporting effect and buffering effect on the battery piece, the thickness h2 of the second part 312 in the second adhesive film 3 can be in the range of (h1, h1+d], where d is the thickness value of the battery piece 21, and at this time, the ratio of the thickness h2 of the second part 312 to the thickness h1 of the first part 311 can be in the range of (0, d / h1]. Here, the thickness of the battery piece 21 is not limited, for example, the thickness value d of the battery piece 21 can be in the range of [0.03mm, 0.08mm], if the thickness h1 of the first part 311 is in the range of [0.35mm, 0.45mm], then the thickness h2 of the second part 312 in the second adhesive film 3 satisfies 0.35mm < h2≤ 0.38mm, at this time, the thickness h2 of the second part 312 can be 0.36mm, 0.37mm or 0.38mm, etc.; or, the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.35mm < h2≤ 0.43mm, at this time, the thickness h2 of the second part 312 can be 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm or 0.43mm, etc.; or, the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.45mm < h2≤ 0.48mm, at this time, the thickness h2 of the second part 312 can be 0.46mm, 0.47mm or 0.48mm, etc.; or, the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.45mm < h2≤ 0.53mm, at this time, the thickness h2 of the second part 312 can be 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.50mm, 0.51mm, 0.52mm or 0.53mm, etc.The ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.03 / 0.45], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.02, 0.03, 0.04, 0.05, or 0.06; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.03 / 0.35], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, or 0.08; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.08 / 0.45], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, or 0.17; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.08 / 0.35], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.18, 0.20, or 0.22.

[0059] With reference to Figure 2As shown, the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (h1+d)], where the unit of the curvature is mm-1, h1 is the thickness value of the first part 311, and d is the thickness value of the battery piece 21. The curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 can increase from 0 mm-1 to 2 / (h1+d) along the AB direction. If the thickness h1 of the first part 311 is in the range of [0.35 mm, 0.45 mm], and the thickness value d of the battery piece 21 is in the range of [0.03 mm, 0.08 mm], the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.35 mm+0.03 mm)], i.e., (0 mm-1, 2 / (0.38 mm)], and the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.35 mm+0.08 mm)], i.e., (0 mm-1, 2 / (0.43 mm)], and the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.45 mm+0.03 mm)], i.e., (0 mm-1, 2 / (0.48 mm)], and the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.1 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.45 mm+0.08 mm)], i.e., (0 mm-1, 2 / (0.53 mm)], and the curvature of the arc surface of the second part 312 away from the battery piece 21 and the arc surface of the second part 312 close to the battery piece 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 3.5 mm-1, or 3.7 mm-1, etc.

[0060] Figure 6 In the shown photovoltaic module, the second adhesive film 3 is provided in an integral layer and has a uniform thickness, and the first adhesive film 1 includes a plurality of adhesive film units 11 connected with each other, each adhesive film unit including a first part 111 and a second part 112 provided around the first part 111, the first part 111 being provided corresponding to the cell sheet 21, and the second part 112 being provided corresponding to a position where the gap 4 around the cell sheet is located; the thickness h4 of the second part 112 is greater than the thickness h3 of the first part 111, and the surface of the second part 112 away from the cell sheet 21 is protruded from the surface of the first part 111 away from the cell sheet 21. The surface of the second part 112 away from the cell sheet 21 and the surface of the second part 112 close to the cell sheet 21 are both arc surfaces, and the bending degrees of the two arc surfaces are gradually increased along the direction from close to the first part 111 to away from the first part 111. In the photovoltaic module, the thickness h4 of the second part 112 is not uniform.

[0061] Figure 6 In the shown photovoltaic module, the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first adhesive film 1 are not limited in specific ranges; for example, the thickness h3 of the first part 111 is less than 0.28 mm, and then the bonding capacity of the first part 111 after lamination is weakened; and the thickness h1 of the first part 111 is greater than 0.45 mm, which will affect the light transmittance of the first part 111 and increase the cost, therefore the thickness h3 of the first part 111 can be selected in the range of [0.28 mm, 0.45 mm], for example, the thickness h3 of the first part 111 can be 0.28 mm, 0.30 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.40 mm, 0.42 mm or 0.45 mm, etc.

[0062] Reference Figure 6As shown, in order to reduce the influence on the flatness of the assembly, while improving the supporting effect and buffering effect on the battery piece, the thickness h4 of the second part 112 in the first adhesive film 1 can be in the range of (h3, h3+d], wherein d is the thickness value of the battery piece 21, at this time, the ratio of the thickness h4 of the second part 112 to the thickness h3 of the first part 111 can be in the range of (0, d / h3]. Here, the thickness of the battery piece 21 is not limited, for example, the thickness value d of the battery piece 21 can be in the range of [0.03mm, 0.08mm], if the thickness h3 of the first part 111 is in the range of [0.28mm, 0.45mm], then the thickness h4 of the second part 112 in the first adhesive film 1 satisfies 0.28mm < h4≤ 0.31mm, at this time, the thickness h4 of the second part 112 can be 0.28mm, 0.29mm, 0.30mm or 0.31mm, etc.; or, the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.28mm < h4≤ 0.36mm, at this time, the thickness h4 of the second part 112 can be 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm or 0.36mm, etc.; or, the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.45mm < h4≤ 0.48mm, at this time, the thickness h4 of the second part 112 can be 0.45mm, 0.46mm, 0.47mm or 0.48mm, etc.; or, the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.45mm < h4≤ 0.53mm, at this time, the thickness h4 of the second part 112 can be 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.50mm, 0.51mm, 0.52mm or 0.53mm, etc.The ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.03 / 0.45], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.02, 0.03, 0.04, 0.05, or 0.06; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.03 / 0.28], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.10; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.08 / 0.45], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, or 0.17; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.08 / 0.28], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.21, 0.23, 0.25, or 0.28.

[0063] With reference to Figure 6As shown, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (h3+d)], where the unit of the curvature is mm-1, h3 is the thickness value of the first part 111, and d is the thickness value of the battery piece 21. If the thickness value of the first part 111 h3 is in the range of [0.28 mm, 0.45 mm], and the thickness value of the battery piece 21 d is in the range of [0.03 mm, 0.08 mm], the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.28 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.31 mm)], at this time, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, 5 mm-1, 6 mm-1, or 6.4 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.28 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.36 mm)], at this time, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, 5 mm-1, or 5.5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.45 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.53 mm)], at this time, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 3.5 mm-1, or 3.7 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.45 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.48 mm)], at this time, the curvature of the arc surface of the second part 112 away from the battery piece 21 and the curvature of the arc surface of the second part 112 close to the battery piece 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.1 mm-1, etc.

[0064] Figure 7In the shown photovoltaic module, the first adhesive film 1 comprises a plurality of adhesive film units 11 connected together, the adhesive film unit 11 of the first adhesive film 1 comprises a first part 111 and a second part 112 arranged around the first part 111, the first part 111 is arranged corresponding to the cell piece 21, and the second part 112 is arranged corresponding to the position of the gap 4 around the periphery of the cell piece; the thickness h4 of the second part 112 of the first adhesive film 1 is greater than the thickness h3 of the first part 111, and the surface of the second part 112 away from the cell piece 21 protrudes from the surface of the first part 111 away from the cell piece 21. The surface of the second part 112 away from the cell piece 21 and the surface of the second part 112 close to the cell piece 21 are both arc surfaces, and the bending degrees of the two arc surfaces gradually increase along the direction from close to the first part 111 to away from the first part 111. In the photovoltaic module, the thickness h4 of the second part 112 is not uniform.

[0065] Figure 7 In the shown photovoltaic module, the second adhesive film 3 comprises a plurality of adhesive film units 31 connected together, the adhesive film unit 31 of the second adhesive film 3 comprises a first part 311 and a second part 312 arranged around the first part 311, the first part 311 is arranged corresponding to the cell piece 21, and the second part 312 is arranged corresponding to the position of the gap 4 around the periphery of the cell piece; the thickness h2 of the second part 312 of the second adhesive film 3 is greater than the thickness h1 of the first part 311, and the surface of the second part 312 away from the cell piece 21 protrudes from the surface of the first part 311 away from the cell piece 21. The surface of the second part 312 away from the cell piece 21 and the surface of the second part 312 close to the cell piece 21 are both arc surfaces, and the bending degrees of the two arc surfaces gradually increase along the AB direction. In the photovoltaic module, the thickness h2 of the second part 312 of the second adhesive film 3 is not uniform.

[0066] Figure 7In the shown photovoltaic module, the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first adhesive film 1 are not limited in a specific range; for example, the thickness h3 of the first part 111 is less than 0.28 mm, and then the bonding capacity of the first part 111 after lamination is weakened; and the thickness h1 of the first part 111 is greater than 0.45 mm, which affects the light transmittance of the first part 111 and increases the cost, so the thickness h3 of the first part 111 can be selected in the range of [0.28 mm, 0.45 mm], for example, the thickness h3 of the first part 111 can be 0.28 mm, 0.30 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.40 mm, 0.42 mm, or 0.45 mm, etc. In order to reduce the influence on the flatness of the module and improve the supporting and buffering effects on the cell sheet, the thickness h4 of the second part 112 can be in the range of (h3, h3+d], where d is the thickness value of the cell sheet 21, and at this time, the ratio of the thickness h4 of the second part 112 to the thickness h3 of the first part 111 can be in the range of (0, d / h3]. The curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 can both be in the range of (0 mm^-1, 2 / (h3+d)], where the unit of curvature is mm^-1, h3 is the thickness value of the first part 111, and d is the thickness value of the cell sheet 21. Here, the thickness of the cell sheet 21 is not limited, for example, the thickness value d of the cell sheet 21 can be in the range of [0.03 mm, 0.08 mm], if the thickness h3 of the first part 111 is in the range of [0.28 mm, 0.45 mm], then the thickness h4 of the second part 112 in the first adhesive film 1 satisfies 0.28 mm < h4≤0.31 mm, and at this time, the thickness h4 of the second part 112 can be 0.28 mm, 0.29 mm, 0.30 mm, or 0.31 mm, etc.; or the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.28 mm < h4≤0.36 mm, and at this time, the thickness h4 of the second part 112 can be 0.28 mm, 0.29 mm, 0.30 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, or 0.36 mm, etc.; or the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.45 mm < h4≤0.48 mm, and at this time, the thickness h4 of the second part 112 can be 0.45 mm, 0.46 mm, 0.47 mm, or 0.48 mm, etc.; or the thickness h4 of the second part 112 in the first adhesive film 1 can also satisfy 0.45 mm < h4≤0.53 mm, and at this time, the thickness h4 of the second part 112 can be 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, 0.50 mm, 0.51 mm, 0.52 mm, or 0.53 mm, etc.The ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.03 / 0.45], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.02, 0.03, 0.04, 0.05, or 0.06; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.03 / 0.28], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.10; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.08 / 0.45], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, or 0.17; or the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be in the range of (0, 0.08 / 0.28], in which case the ratio of the thickness h4 of the second portion 112 to the thickness h3 of the first portion 111 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.21, 0.23, 0.25, or 0.28.

[0067] Figure 7In the shown photovoltaic module, the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second adhesive film 3 are not limited in a specific range; for example, the thickness h1 of the first part 311 is less than 0.35 mm, and then the bonding capacity of the first part 311 after lamination is weakened; and the thickness h1 of the first part 311 is greater than 0.45 mm, which will affect the light transmittance of the first part 311 and increase the cost, so the thickness h1 of the first part 311 can be selected in the range of [0.35 mm, 0.45 mm], for example, the thickness h1 of the first part 311 can be 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.40 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm or 0.45 mm, etc. In order to reduce the influence on the flatness of the module and at the same time improve the supporting effect and buffering effect on the cell sheet, the thickness h2 of the second part 312 can be in the range of (h1, h1+d], where d is the thickness value of the cell sheet 21, and at this time, the ratio of the thickness h2 of the second part 312 to the thickness h1 of the first part 311 can be in the range of (0, d / h1]. Here, the thickness of the cell sheet 21 is not limited, for example, the thickness value d of the cell sheet 21 can be in the range of [0.03 mm, 0.08 mm], if the thickness h1 of the first part 311 is in the range of [0.35 mm, 0.45 mm], then the thickness h2 of the second part 312 in the second adhesive film 3 satisfies 0.35 mm < h2 ≤ 0.38 mm, at this time, the thickness h2 of the second part 312 can be 0.36 mm, 0.37 mm or 0.38 mm, etc.; or the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.35 mm < h2 ≤ 0.43 mm, at this time, the thickness h2 of the second part 312 can be 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.40 mm, 0.41 mm, 0.42 mm or 0.43 mm, etc.; or the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.45 mm < h2 ≤ 0.48 mm, at this time, the thickness h2 of the second part 312 can be 0.46 mm, 0.47 mm or 0.48 mm, etc.; or the thickness h2 of the second part 312 in the second adhesive film 3 can also satisfy 0.45 mm < h2 ≤ 0.53 mm, at this time, the thickness h2 of the second part 312 can be 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, 0.50 mm, 0.51 mm, 0.52 mm or 0.53 mm, etc.The ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.03 / 0.45], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.02, 0.03, 0.04, 0.05, or 0.06; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.03 / 0.35], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, or 0.08; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.08 / 0.45], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, or 0.17; or the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be in the range of (0, 0.08 / 0.35], in which case the ratio of the thickness h2 of the second portion 312 to the thickness hi of the first portion 311 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.18, 0.20, or 0.22.

[0068] Figure 7In the shown photovoltaic module, the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can both be in the range of (0 mm-1, 2 / (h1+d)], where the unit of the curvature is mm-1, h1 is the thickness value of the first part 311, and d is the thickness value of the cell sheet 21. If the thickness h1 of the first part 311 is in the range of [0.35 mm, 0.45 mm], and the thickness value d of the cell sheet 21 is in the range of [0.03 mm, 0.08 mm], then the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.35 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.38 mm)], at which time the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.35 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.43 mm)], at which time the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.45 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.48 mm)], at which time the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.1 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be in the range of (0 mm-1, 2 / (0.45 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.53 mm)], at which time the curvature of the arc surface of the second part 312 away from the cell sheet 21 and the curvature of the arc surface of the second part 312 close to the cell sheet 21 in the second adhesive film 3 can be 1 mm-1, 2 mm-1, 3 mm-1, 3.5 mm-1, or 3.7 mm-1, etc.

[0069] Figure 7In the shown photovoltaic module, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can both be in the range of (0 mm-1, 2 / (h3+d)], where the unit of the curvature is mm-1, h3 is the thickness value of the first part 111, and d is the thickness value of the cell sheet 21. If the thickness value h3 of the first part 111 is in the range of [0.28 mm, 0.45 mm], and the thickness value d of the cell sheet 21 is in the range of [0.03 mm, 0.08 mm], then the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.28 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.31 mm)], at this time, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, 5 mm-1, 6 mm-1, or 6.4 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.28 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.36 mm)], at this time, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, 5 mm-1, or 5.5 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.45 mm+0.08 mm)], i.e. (0 mm-1, 2 / (0.53 mm)], at this time, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 3.5 mm-1, or 3.7 mm-1, etc. Alternatively, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be in the range of (0 mm-1, 2 / (0.45 mm+0.03 mm)], i.e. (0 mm-1, 2 / (0.48 mm)], at this time, the curvature of the arc surface of the second part 112 away from the cell sheet 21 and the curvature of the arc surface of the second part 112 close to the cell sheet 21 in the first adhesive film 1 can be 1 mm-1, 2 mm-1, 3 mm-1, 4 mm-1, or 4.1 mm-1, etc.

[0070] Figure 8Among the photovoltaic modules shown, with Figure 2 The structural difference lies in that: the surface of the second part 312 facing away from the battery cell 21 and the surface of the second part 312 approaching the battery cell 21 in the second adhesive film 3 are both curved surfaces, and the curvature of both curved surfaces gradually decreases along the AB direction. (Reference) Figure 8 As shown, the curvature of the second part 312 of the second adhesive film 3, the arc surface facing away from the battery cell 21, and the arc surface of the second part 312 near the battery cell 21 can both be in the range of (0 mm^-1, 2 / (h1+d)], where the unit of curvature is mm^-1, h1 is the thickness of the first part 311, and d is the thickness of the battery cell 21. The curvature of the second part 312 of the second adhesive film 3, the arc surface facing away from the battery cell 21, and the arc surface of the second part 312 near the battery cell 21, can decrease from 2 / (h1+d) to 0 mm^-1 along the AB direction. Figure 8 Among the photovoltaic modules shown, with Figure 2 The same structure as the photovoltaic module shown can be referred to the above. Figure 2 The explanation is omitted here. Additionally, Figure 8 In the photovoltaic module shown, the range of values ​​for the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 2 Related explanations.

[0071] Figure 9 Among the photovoltaic modules shown, with Figure 6 The structural difference lies in that: the surface of the second part 112 facing away from the battery cell 21 and the surface of the second part 112 approaching the battery cell 21 in the first adhesive film 1 are both curved surfaces, and the curvature of both curved surfaces gradually decreases from the direction closer to the first part 111 to the direction farther away from the first part 111. (Reference) Figure 9 As shown, the curvature of the second part 112 away from the battery cell 21 and the second part 112 near the battery cell 21 can both be in the range of (0 mm^-1, 2 / (h3+d)], where the unit of curvature is mm^-1, h3 is the thickness value of the first part 111, and d is the thickness value of the battery cell 21. Figure 9 Among the photovoltaic modules shown, with Figure 6 The same structure as the photovoltaic module shown can be referred to the above. Figure 6 The explanation is omitted here. Additionally, Figure 9 In the photovoltaic module shown, the range of values ​​for the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first encapsulant film 1 can also be referenced. Figure 6 Related explanations.

[0072] Figure 10 Among the photovoltaic modules shown, with Figure 7The difference between the structures is that: in the first adhesive film 1, the arc surface of the second part 112 away from the surface of the battery piece 21 and the arc surface of the second part 112 close to the surface of the battery piece 21 both gradually decrease along the direction from close to the first part 111 to away from the first part 111. In the second adhesive film 3, the arc surface of the second part 312 away from the surface of the battery piece 21 and the arc surface of the second part 312 close to the surface of the battery piece 21 both gradually decrease along the AB direction. For reference Figure 9 As shown, the curvature of the arc surface of the second part 112 away from the surface of the battery piece 21 and the curvature of the arc surface of the second part 112 close to the surface of the battery piece 21 in the first adhesive film 1 can both be in the range of (0mm^-1, 2 / (h3+d)], where the unit of curvature is mm^-1, h3 is the thickness value of the first part 111 in the first adhesive film 1, and d is the thickness value of the battery piece 21. For reference Figure 8 As shown, the curvature of the arc surface of the second part 312 away from the surface of the battery piece 21 and the curvature of the arc surface of the second part 312 close to the surface of the battery piece 21 in the second adhesive film 3 can both be in the range of (0mm^-1, 2 / (h1+d)], where the unit of curvature is mm^-1, h1 is the thickness value of the first part 311 in the second adhesive film 3, and d is the thickness value of the battery piece 21. Figure 10 As shown in the photovoltaic module, the structure of the second adhesive film 3 is the same as that of the photovoltaic module shown in Figure 7 For reference, the above description of the structure of the second adhesive film 3 can be referred to the above description of the structure of the second adhesive film 3 in the photovoltaic module shown in Figure 7 For reference, the above description of the structure of the second adhesive film 3 can be referred to the above description of the structure of the second adhesive film 3 in the photovoltaic module shown in Figure 8 In addition, the above description of the structure of the second adhesive film 3 can be referred to the above description of the structure of the second adhesive film 3 in the photovoltaic module shown in Figure 7 For reference, the above description of the structure of the second adhesive film 3 can be referred to the above description of the structure of the second adhesive film 3 in the photovoltaic module shown in

[0073] Figure 11 As shown in the photovoltaic module, the structure of the second adhesive film 3 is the same as that of the photovoltaic module shown in Figure 2 The difference between the structures is that: in the second adhesive film 3, the straight surface of the second part 312 away from the surface of the battery piece 21 and the straight surface of the second part 312 close to the surface of the battery piece 21 both gradually decrease along the AB direction, for reference Figure 11As shown, the angle β between the surface of the second part 312 of the second film 3 facing away from the solar cell 21 and the surface of the first part 311 of the film unit 31 facing away from the solar cell 21 is an obtuse angle. The range of this obtuse angle is not limited, and it is related to the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell. The smaller the obtuse angle value, the greater the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell, and the better its effect of dispersing external forces. Conversely, the larger the obtuse angle value, the smaller the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell, which is more conducive to improving the flatness of the module while ensuring the effect of dispersing external forces. Therefore, a suitable obtuse angle value can be selected by comprehensively considering factors such as the effect of dispersing external forces and the flatness of the module. The range of this obtuse angle value can be [140 degrees, 170 degrees], for example: the obtuse angle value can be 140 degrees, 150 degrees, 160 degrees, or 170 degrees. Figure 11 Among the photovoltaic modules shown, with Figure 2 The same structure as the photovoltaic module shown can be referred to the above. Figure 2 The explanation is omitted here. Additionally, Figure 11 In the photovoltaic module shown, the range of values ​​for the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 2 Related explanations.

[0074] Figure 12 Among the photovoltaic modules shown, with Figure 6 The structural difference is that the surface of the second part 112 facing away from the battery cell 21 and the surface of the second part 112 close to the battery cell 21 in the first adhesive film 1 are both straight. Figure 11 The angle between the surface of the second part 112 of the first adhesive film 1 facing away from the solar cell 21 and the surface of the first part 111 of the adhesive film unit 11 facing away from the solar cell 21 is an obtuse angle. The range of this obtuse angle is not limited, and it is related to the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell. The smaller the obtuse angle value, the greater the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell, and the better its effect of dispersing external forces. Conversely, the larger the obtuse angle value, the smaller the maximum thickness of the portion of the second part protruding from the surface of the first part facing away from the solar cell, which is more conducive to improving the flatness of the module while ensuring the effect of dispersing external forces. Therefore, a suitable obtuse angle value can be selected by comprehensively considering factors such as the effect of dispersing external forces and the flatness of the module. The range of this obtuse angle value can be [140 degrees, 170 degrees], for example: the obtuse angle value can be 140 degrees, 150 degrees, 160 degrees, or 170 degrees. Figure 12 Among the photovoltaic modules shown, with Figure 6 The same structure as the photovoltaic module shown can be referred to the above. Figure 6 The relevant explanations will not be repeated here. Additionally, Figure 12In the photovoltaic module shown, the range of values ​​for the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first encapsulant film 1 can also be referenced. Figure 6 Related explanations.

[0075] Figure 13 Among the photovoltaic modules shown, with Figure 7 The structural differences are as follows: in the first adhesive film 1, the surface of the second part 112 facing away from the battery cell 21 and the surface of the second part 112 close to the battery cell 21 are both straight surfaces; in the second adhesive film 3, the surface of the second part 312 facing away from the battery cell 21 and the surface of the second part 312 close to the battery cell 21 are both straight surfaces. Figure 13 The angle between the surface of the second part 312 of the second adhesive film 3 facing away from the battery cell 21 and the surface of the first part 311 of the adhesive film unit 31 facing away from the battery cell 21 is an obtuse angle. Similarly, the angle between the surface of the second part 112 of the first adhesive film 1 facing away from the battery cell 21 and the surface of the first part 111 of the adhesive film unit 11 facing away from the battery cell 21 is also an obtuse angle. The ranges of these two obtuse angles can be found by referring to... Figure 11 and Figure 12 Related explanations. Figure 13 Among the photovoltaic modules shown, with Figure 7 The same structure as the photovoltaic module shown can be referred to the above. Figure 7 The explanation is omitted here. Additionally, Figure 13 In the photovoltaic module shown, the ranges of thickness h2 of the second part 312 and thickness h1 of the first part 311 in the second encapsulant film 3, as well as the ranges of thickness h4 of the second part 112 and thickness h3 of the first part 111 in the first encapsulant film 1, can also be referenced. Figure 7 Related explanations.

[0076] Figure 14 Among the photovoltaic modules shown, with Figure 2 The structural difference lies in that the surface of the second part 312 facing away from the battery cell 21 and the surface of the second part 312 close to the battery cell 21 in the second adhesive film 3 are both stepped surfaces. Figure 14 Among the photovoltaic modules shown, with Figure 2 The same structure as the photovoltaic module shown can be referred to the above. Figure 2 The explanation is omitted here. Additionally, Figure 14 In the photovoltaic module shown, the range of values ​​for the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 2 Related explanations.

[0077] Figure 15 Among the photovoltaic modules shown, with Figure 6 The structural difference lies in that the surface of the second part 112 facing away from the battery cell 21 and the surface of the second part 112 close to the battery cell 21 in the first adhesive film 1 are both stepped surfaces.Figure 15 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 6 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 6 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 15 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 6 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface.

[0078] Figure 16 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 7 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 16 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 7 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 7 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 16 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 7 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface.

[0079] The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figures 20-31 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface. Figure 20 The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface.

[0080] The photovoltaic module shown in the above embodiment has the same structure as the photovoltaic module shown in the above embodiment except that the second part 112 of the first adhesive film 1 has a stepped surface.

[0081] Figure 20 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 2 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 20 The same structure of the photovoltaic module shown in the figure can refer to the foregoing Figure 2 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 2 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 20 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 2 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet.

[0082] Figure 21 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 6 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 21 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 6 The same structure of the photovoltaic module shown in the figure can refer to the foregoing Figure 6 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 21 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 6 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet.

[0083] Figure 22 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 7 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 22 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 7 The same structure of the photovoltaic module shown in the figure can refer to the foregoing Figure 7 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 22 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 7 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet.

[0084] Figure 23 The difference between the photovoltaic module shown in the figure and the photovoltaic module shown in the figure is that the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 8The structural difference is that the surface of the second part 312 of the second adhesive film 3 facing away from the battery cell 21 is flush with the surface of the first part 311 of the second adhesive film 3 facing away from the battery cell. Figure 23 Among the photovoltaic modules shown, with Figure 8 The same structure as the photovoltaic module shown can be referred to the above. Figure 8 The explanation is omitted here. Additionally, Figure 23 In the photovoltaic module shown, the range of values ​​for the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 8 Related explanations.

[0085] Figure 24 Among the photovoltaic modules shown, with Figure 9 The structural difference is that the surface of the second part 112 of the first adhesive film 1 facing away from the battery cell 21 is flush with the surface of the first part 111 of the first adhesive film 1 facing away from the battery cell. Figure 24 Among the photovoltaic modules shown, with Figure 9 The same structure as the photovoltaic module shown can be referred to the above. Figure 9 The explanation is omitted here. Additionally, Figure 24 In the photovoltaic module shown, the range of values ​​for the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first encapsulant film 1 can also be referenced. Figure 9 Related explanations.

[0086] Figure 25 Among the photovoltaic modules shown, with Figure 10 The structural difference is that the surface of the second part 112 of the first adhesive film 1 facing away from the battery cell 21 is flush with the surface of the first part 111 of the first adhesive film 1 facing away from the battery cell, and the surface of the second part 312 of the second adhesive film 3 facing away from the battery cell 21 is flush with the surface of the first part 311 of the second adhesive film 3 facing away from the battery cell. Figure 25 Among the photovoltaic modules shown, with Figure 10 The same structure as the photovoltaic module shown can be referred to the above. Figure 10 The explanation is omitted here. Additionally, Figure 25 In the photovoltaic module shown, the ranges of thickness h4 of the second part 112 and thickness h3 of the first part 111 in the first encapsulant film 1, and the ranges of thickness h2 of the second part 312 and thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 10 Related explanations.

[0087] Figure 26 Among the photovoltaic modules shown, with Figure 11 The structural difference is that the surface of the second part 312 of the second adhesive film 3 facing away from the battery cell 21 is flush with the surface of the first part 311 of the second adhesive film 3 facing away from the battery cell. Figure 26 Among the photovoltaic modules shown, withFigure 11 The same structure of the photovoltaic module shown in FIG. 1 can refer to the foregoing Figure 11 description, which will not be repeated here. In addition, Figure 26 The thickness h2 of the second part 312 and the thickness h1 of the first part 311 of the second adhesive film 3 in the photovoltaic module shown in FIG. 1 can also refer to the related description of Figure 11 .

[0088] Figure 27 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 12 The surface of the second part 112 of the first adhesive film 1 away from the cell sheet 21 is arranged flush with the surface of the first part 111 of the first adhesive film 1 away from the cell sheet. Figure 27 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 12 The same structure of the photovoltaic module shown in FIG. 1 can refer to the foregoing Figure 12 description, which will not be repeated here. In addition, Figure 27 The thickness h4 of the second part 112 and the thickness h3 of the first part 111 of the first adhesive film 1 in the photovoltaic module shown in FIG. 1 can also refer to the related description of Figure 12 .

[0089] Figure 28 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 13 The surface of the second part 112 of the first adhesive film 1 away from the cell sheet 21 is arranged flush with the surface of the first part 111 of the first adhesive film 1 away from the cell sheet, and the surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is arranged flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 28 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 13 The same structure of the photovoltaic module shown in FIG. 1 can refer to the foregoing Figure 13 description, which will not be repeated here. In addition, Figure 28 The thickness h4 of the second part 112 and the thickness h3 of the first part 111 of the first adhesive film 1 in the photovoltaic module shown in FIG. 1 and the thickness h2 of the second part 312 and the thickness h1 of the first part 311 of the second adhesive film 3 can also refer to the related description of Figure 13 .

[0090] Figure 29 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 14 The surface of the second part 312 of the second adhesive film 3 away from the cell sheet 21 is arranged flush with the surface of the first part 311 of the second adhesive film 3 away from the cell sheet. Figure 29 The photovoltaic module shown in FIG. 1 is different from the photovoltaic module shown in FIG. 1 in that: Figure 14 The same structure of the photovoltaic module shown in FIG. 1 can refer to the foregoing Figure 14 description, which will not be repeated here. In addition, Figure 29In the photovoltaic module shown, the range of values ​​for the thickness h2 of the second part 312 and the thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 14 Related explanations.

[0091] Figure 30 Among the photovoltaic modules shown, with Figure 15 The structural difference is that the surface of the second part 112 of the first adhesive film 1 facing away from the battery cell 21 is flush with the surface of the first part 111 of the first adhesive film 1 facing away from the battery cell. Figure 30 Among the photovoltaic modules shown, with Figure 15 The same structure as the photovoltaic module shown can be referred to the above. Figure 15 The explanation is omitted here. Additionally, Figure 30 In the photovoltaic module shown, the range of values ​​for the thickness h4 of the second part 112 and the thickness h3 of the first part 111 in the first encapsulant film 1 can also be referenced. Figure 15 Related explanations.

[0092] Figure 31 Among the photovoltaic modules shown, with Figure 16 The structural difference is that the surface of the second part 112 of the first adhesive film 1 facing away from the battery cell 21 is flush with the surface of the first part 111 of the first adhesive film 1 facing away from the battery cell, and the surface of the second part 312 of the second adhesive film 3 facing away from the battery cell 21 is flush with the surface of the first part 311 of the second adhesive film 3 facing away from the battery cell. Figure 31 Among the photovoltaic modules shown, with Figure 16 The same structure as the photovoltaic module shown can be referred to the above. Figure 16 The explanation is omitted here. Additionally, Figure 31 In the photovoltaic module shown, the ranges of thickness h4 of the second part 112 and thickness h3 of the first part 111 in the first encapsulant film 1, and the ranges of thickness h2 of the second part 312 and thickness h1 of the first part 311 in the second encapsulant film 3 can also be referenced. Figure 16 Related explanations.

[0093] Compared with the same thickness of the film in the related art, the photovoltaic module disclosed in the embodiment enhances the supporting effect and the buffering effect of the second part by thickening the second part, so as to reduce the force on the edge of the cell in the process of lamination and transportation, greatly reduce the possibility of edge crack of the cell, and further greatly improve the product quality. In addition, the surface of the second part away from the cell is flush with the surface of the first part away from the cell, and at least part of the surface of the second part close to the cell protrudes from the surface of the first part close to the cell, and a gap is provided between adjacent cells. The part of the surface of the second part close to the cell that protrudes from the surface of the first part close to the cell can be arranged in the gap, and the thickness of the module will not be additionally increased. Compared with the photovoltaic module disclosed in the foregoing embodiment, the flatness of the photovoltaic module is better.

[0094] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present disclosure, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make various modifications and modifications without departing from the spirit and scope of the present disclosure, therefore the protection scope of the present disclosure should be limited by the scope defined by the claims.

Claims

1. A photovoltaic module, characterized by, The battery string is arranged between the first adhesive film and the second adhesive film. The battery string comprises a plurality of battery pieces arranged in an array; at least one of the first adhesive film and the second adhesive film comprises a plurality of adhesive film units connected to each other; each adhesive film unit comprises a first part and a second part arranged around the first part, the first part is arranged corresponding to the battery pieces, and the second part is arranged corresponding to a position of a gap around the battery pieces; the thickness of the second part is greater than the thickness of the first part, and at least part of the surface of the second part away from the battery pieces protrudes from the surface of the first part away from the battery pieces; the second parts of adjacent adhesive film units are arranged in a splicing manner, the top corner of the second part of the adhesive film unit is a chamfer structure, and the chamfer structures of adjacent adhesive film units form a hollow hole.

2. The photovoltaic module of claim 1, wherein, In the adhesive film unit, the thickness of the part of the second part protruding from the surface of the first part away from the battery pieces increases along a first direction from the first part to the second part.

3. The photovoltaic module of claim 2, wherein, In the adhesive film unit, the surface of the second part away from the battery pieces is a straight surface or an arc surface.

4. The photovoltaic module of claim 1, wherein, In the adhesive film unit, the thickness of the part of the second part protruding from the surface of the first part away from the battery pieces is the same.

5. The photovoltaic module of claim 4, wherein, In the adhesive film unit, the surface of the second part away from the battery pieces is a stepped surface.

6. The photovoltaic module according to any of claims 1 to 5, characterized in that In the adhesive film unit, the second part protrudes from the surface of the first part close to the battery pieces.

7. The photovoltaic module of claim 6, wherein, In the adhesive film unit, the second part comprises a first protruding sub-part, a body sub-part and a second protruding sub-part arranged in a stack; the first protruding sub-part protrudes from the surface of the first part away from the battery pieces, the second protruding sub-part protrudes from the surface of the first part close to the battery pieces, and the first protruding sub-part and the second protruding sub-part are symmetrically arranged about the body sub-part.

8. The photovoltaic module of claim 1, wherein, In the adhesive film unit, the hardness of the second part is less than the hardness of the first part.

9. The photovoltaic module of claim 1, wherein, In the adhesive film unit, the hardness of the part of the first part in contact with the battery pieces is less than the hardness of the part of the first part not in contact with the battery pieces.

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