Photovoltaic module

Abstract

The utility model provides a photovoltaic assembly. The photovoltaic assembly comprises a battery structure, a first packaging plate, a first adhesive film and a supplementary adhesive film. The battery structure comprises a welding strip, a plurality of welding strip bonding films and a plurality of solar battery pieces, the welding strip bonding films are bonded to the welding strip and the corresponding solar battery pieces, and gaps are formed between the adjacent welding strip bonding films. The first adhesive film and the battery structure are sequentially stacked on the first packaging plate, the supplementary adhesive film is attached to the side, close to the first adhesive film, of the first packaging plate, and the position of the supplementary adhesive film corresponds to the gap between the adjacent welding strip adhesive films. The photovoltaic module can effectively reduce or even avoid bubbles generated at the edges of the solar cells and in the gaps between the adjacent solar cells in the lamination process, and then the packaging yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] A solar cell is a device that can convert solar energy into electrical energy. Common solar cells are in the form of sheets, which are formed after crystalline silicon wafers are doped and coated. In the actual production process, multiple solar cell sheets are usually connected to form a solar cell string, and they are encapsulated with adhesive film and packaging plates to form a photovoltaic module.

[0003] The electrodes in solar cells are usually prepared with conductive silver paste, and the material cost of the electrodes accounts for a considerable proportion of the cost of solar cells. The busbar-free welding technology can significantly reduce the amount of electrodes used and thus reduce the cost of solar cells. In the busbar-free welding technology, a welding ribbon adhesive film is required to physically contact and fix the welding ribbon and the solar cell during the stringing process. The area of ​​the welding ribbon adhesive film is smaller than that of the solar cell, so the edge of the solar cell and the gap between the solar cell will not be covered by the welding ribbon adhesive film, and there is a certain thickness difference between the area covered with the film and the area not covered with the film. If a lower gram weight adhesive film is used for packaging, bubbles are easily generated at the edge of the solar cell and the gap between adjacent solar cells, resulting in poor packaging. Utility Model Content

[0004] Based on this, when using a relatively low-weight adhesive film for packaging, in order to reduce or avoid bubbles generated at the edges of solar cells and in the gaps between adjacent solar cells and to improve the packaging yield, it is necessary to provide a photovoltaic module.

[0005] According to some embodiments of the present utility model, a photovoltaic module is provided, comprising: a first packaging board, a supplementary adhesive film, a first adhesive film and a battery structure, wherein the first adhesive film and the battery structure are sequentially stacked on the first packaging board;

[0006] The battery structure includes a welding strip, a plurality of welding strip adhesive films and a plurality of solar cell sheets, wherein the welding strip is connected to the electrodes on the solar cell sheets, each welding strip adhesive film is arranged on the corresponding solar cell sheet, and the welding strip adhesive film is bonded to the welding strip and the corresponding solar cell sheet, and there is a gap between adjacent welding strip adhesive films;

[0007] The supplementary adhesive film is attached to a side of the first packaging board close to the first adhesive film, and the supplementary adhesive film is arranged corresponding to the gap between the adjacent soldering tape adhesive films.

[0008] In some embodiments of the present invention, the photovoltaic assembly further includes a reflective film, and the reflective film is disposed between the supplementary adhesive film and the first packaging board.

[0009] In some embodiments of the present invention, the reflective film has a reflective surface close to the supplementary adhesive film, and the reflective surface is undulating.

[0010] In some embodiments of the present invention, the reflective film includes a polymer layer and a metal layer which are stacked, and a surface of the metal layer which is away from the polymer layer forms the reflective surface.

[0011] In some embodiments of the present invention, the photovoltaic assembly further includes a reflective adhesive film, and the reflective adhesive film is disposed between the reflective film and the first packaging board.

[0012] In some embodiments of the present invention, the ratio of the gram weight of the welding tape adhesive film to the gram weight of the supplementary adhesive film is 1:(0.8~1.2).

[0013] In some embodiments of the present invention, the weight of the solder tape adhesive film is 90 g / m 2 ~200g / m 2 and / or,

[0014] The first adhesive film has a grammage of <300 g / m 2 and / or,

[0015] The weight of the supplementary film is 90 g / m 2 ~200g / m 2 .

[0016] In some embodiments of the present invention, the surface of the solar cell sheet has a residual area between the edge of the solar cell sheet and the edge of the welding tape adhesive film, and the edge of the supplementary adhesive film is located on the residual area, or the edge of the supplementary adhesive film is located in the gap between two adjacent solar cell sheets.

[0017] In some embodiments of the present invention, the photovoltaic module further includes a second packaging board and a second adhesive film, the second adhesive film and the second packaging board are arranged on a side of the battery structure away from the first packaging board, and the second adhesive film is arranged between the battery structure and the second packaging board.

[0018] In some embodiments of the present invention, the supplementary adhesive film and the solder tape adhesive film are both ethylene-vinyl acetate copolymer films.

[0019] The photovoltaic module of the utility model comprises a first packaging board, a supplementary adhesive film, a first adhesive film and a battery structure. The battery structure has a welding tape adhesive film bonded to the welding tape and the solar cell sheet, and there is a gap between the welding tape adhesive films. By arranging a supplementary adhesive film on one side of the first packaging board close to the first adhesive film, and making the supplementary adhesive film correspond to the gap between adjacent welding tape adhesive films, the thickness difference between the area covered with the welding tape adhesive film and the area not covered with the welding tape adhesive film can be compensated, so that bubbles can be effectively reduced or even avoided at the edge of the solar cell sheet and the gap between adjacent solar cell sheets during the lamination process, thereby improving the packaging yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structure of a photovoltaic module;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of a battery in a photovoltaic module;

[0022] Figure 3 for Figure 2 A top view of the battery structure in FIG.

[0023] Figure 4 for Figure 1 A schematic diagram of a structure in which a supplementary adhesive film in a photovoltaic module is arranged on a first packaging board;

[0024] Figure 5 for Figure 4 A top view of the middle supplementary adhesive film disposed on the first packaging board;

[0025] Figure 6 To place the solar cell Figure 5 A schematic diagram of the structure on the first packaging board;

[0026] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of a supplementary adhesive film, a reflective film and a first packaging plate in a photovoltaic module.

[0027] The reference numerals and their meanings are as follows:

[0028] 110. Battery structure; 111. Solder ribbon; 112. Solar cell sheet; 113. Solder ribbon adhesive film; 120. First packaging board; 130. First adhesive film; 140. Supplementary adhesive film; 150. Second adhesive film; 160. Second packaging board; 210. Reflective film; 211. Metal layer; 212. Polymer layer; 220. Reflective adhesive film. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively in combination with the embodiments and the effect diagrams. The embodiments provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly fixed to the other element, or it may be fixed to the other element through an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element, or there may be an intermediate element between the two elements. In addition, in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated connection. For example, it may be a mechanical connection or an electrical connection. For example, it may be a direct connection, an indirect connection through an intermediate element, or the internal connection of the two elements. It should be understood that those skilled in the art can understand the specific meanings of the above terms according to the specific circumstances without causing ambiguity.

[0031] Unless otherwise specified, in the description of the present invention, terms indicating orientation or positional relationship, such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside", are based on the orientation or positional relationship shown in the drawings of the utility model. They are only for the convenience and simplification of the description of the content of the utility model and to help readers understand the description in conjunction with the drawings. They do not limit or imply a specific orientation that the device or element referred to must have, and therefore should not be understood as a limitation on the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the implementation of the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. "Multiple" herein includes a combination of two or more than two items.

[0033] The utility model provides a photovoltaic module, which includes: a battery structure, a first packaging board, a first adhesive film and a supplementary adhesive film. The battery structure includes a welding strip, a plurality of welding strip adhesive films and a plurality of solar cell sheets, the welding strip is connected to the electrode on the solar cell sheet, each welding strip adhesive film is arranged on the corresponding solar cell sheet, and the welding strip adhesive film is bonded to the welding strip and the corresponding solar cell sheet, and there is a gap between adjacent welding strip adhesive films. The first adhesive film and the battery structure are sequentially stacked on the first packaging board, the supplementary adhesive film is attached to a side of the first packaging board close to the first adhesive film, and the position of the supplementary adhesive film corresponds to the gap between adjacent welding strip adhesive films.

[0034] The photovoltaic module includes a first packaging board, a supplementary adhesive film, a first adhesive film and a battery structure. The battery structure has a welding tape adhesive film bonded to the welding tape and the solar cell sheet, and there is a gap between the welding tape adhesive films. By arranging a supplementary adhesive film on one side of the first packaging board close to the first adhesive film, and making the supplementary adhesive film correspond to the gap between adjacent welding tape adhesive films, the thickness difference between the area covered with the welding tape adhesive film and the area not covered with the welding tape adhesive film can be compensated, so that bubbles can be effectively reduced or even avoided at the edge of the solar cell sheet and the gap between adjacent solar cell sheets during the lamination process, thereby improving the packaging yield.

[0035] Figure 1 This is a schematic diagram of the structure of a photovoltaic module of the utility model. Figure 1 As shown, the photovoltaic module includes: a battery structure 110, a first packaging board 120, a first adhesive film 130 and a supplementary adhesive film 140, and the first adhesive film 130 and the battery structure 110 are sequentially stacked on the first packaging board 120. It can be understood that Figure 1 In order to clearly show the relative positions of the components in the photovoltaic module, the components are spaced apart. However, in an actual photovoltaic module, the components should be stacked and contacted in sequence.

[0036] Figure 2 for Figure 1 A schematic diagram of the structure of a battery structure 110 in a photovoltaic module, Figure 3 for Figure 2 A top view of the battery structure 110 in FIG. Figure 2 and Figure 3 As shown, the battery structure 110 includes a welding ribbon 111, a plurality of welding ribbon adhesive films 113 and a plurality of solar cell sheets 112, the welding ribbon 111 is connected to the electrodes on the solar cell sheets 112, each welding ribbon adhesive film 113 is arranged on the corresponding solar cell sheet 112, and the welding ribbon adhesive film 113 is bonded to the welding ribbon 111 and the corresponding solar cell sheet 112, and there is a gap between adjacent welding ribbon adhesive films 113.

[0037] Figure 4 for Figure 1A schematic diagram of a structure in which a supplementary adhesive film 140 in a photovoltaic module is arranged on a first packaging board 120, Figure 5 for Figure 4 A top view of the supplementary adhesive film 140 disposed on the first packaging board 120. Figure 1 , Figure 4 and Figure 5 As shown, the supplementary adhesive film 140 is attached to one side of the first packaging board 120 close to the first adhesive film 130, and the position of the supplementary adhesive film 140 corresponds to the gap between adjacent solder tape adhesive films 113. It can be understood that the supplementary adhesive film 140 is used to make up for the thickness difference between the area with the solder tape adhesive film 113 and the area without the solder tape adhesive film 113 in the battery structure 110, so the position and shape of the supplementary adhesive film 140 should correspond to the position and shape of the gap between adjacent solder tape adhesive films 113. Further, the supplementary adhesive film 140 can be located on the gap between adjacent solder tape adhesive films 113, and the width of the supplementary adhesive film 140 can be less than or equal to the width of the corresponding gap.

[0038] In some examples of this embodiment, the supplementary adhesive film 140 may be disposed in contact with the first packaging board 120 .

[0039] In some examples of this embodiment, the material of the supplementary adhesive film 140 may be the same as that of the solder tape adhesive film 113, and the ratio of the gram weight of the solder tape adhesive film 113 to the gram weight of the supplementary adhesive film 140 is 1:(0.8-1.2). For example, the ratio of the gram weight of the solder tape adhesive film 113 to the gram weight of the supplementary adhesive film 140 is 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, or the ratio of the gram weight of the solder tape adhesive film 113 to the gram weight of the supplementary adhesive film 140 may also be between any two of the above ratios. By using a supplementary adhesive film 140 made of the same material as the solder tape adhesive film 113 and making the gram weight of the supplementary adhesive film 140 close to the gram weight of the solder tape adhesive film 113, the supplementary adhesive film 140 can make up for the thickness difference caused by the solder tape adhesive film 113 as much as possible. This can effectively avoid the generation of bubbles at the edges of the solar cell panels 112 and in the gaps between adjacent solar cell panels 112 during the lamination process, thereby further improving the packaging yield.

[0040] It can be understood that the first adhesive film 130 is used to stably adhere the battery structure 110 to the first packaging plate 120 . During the actual lamination process, the first adhesive film 130 melts and fills the gap between the battery structure 110 and the first packaging plate 120 .

[0041] In some examples of this embodiment, the weight of the first adhesive film 130 is less than 300 g / m 2 Furthermore, the weight of the first adhesive film 130 may be 150 g / m 2 ~300g / m 2For example, the weight of the first adhesive film 130 may be 150 g / m 2 , 175g / m 2 , 200g / m 2 , 225g / m 2 , 250g / m 2 , 275g / m 2 , 300g / m 2 Alternatively, the weight of the first adhesive film 130 may be between any two of the above weights. Due to the thickness difference caused by the solder tape adhesive film 113 in the battery structure 110 of this embodiment, the conventional technology usually requires a weight greater than 300 g / m 2 In this embodiment, by setting a supplementary film 140 on the gap between the soldering tape adhesive films 113, the locally set supplementary film 140 cooperates with the first adhesive film 130 to effectively fill the gap between the soldering tape adhesive films 113. On this basis, the first adhesive film 130 is further set to have a gram weight of 300g / m 2 In the following, the material cost of the first adhesive film 130 can be reduced while ensuring a high packaging quality, and the light transmittance of the first adhesive film 130 can be increased, thereby improving the component power.

[0042] In some examples of this embodiment, the weight of the solder tape adhesive film 113 is 90 g / m 2 ~200g / m 2 For example, the weight of the solder tape adhesive film 113 may be 90 g / m 2 , 100g / m 2 , 120g / m 2 , 140g / m 2 , 150g / m 2 , 160g / m 2 , 180g / m 2 , 200g / m 2 Alternatively, the weight of the solder tape adhesive film 113 may be between any two of the above weights. 2 ~200g / m 2 The soldering ribbon adhesive film 113 can reduce the material usage while ensuring that the soldering ribbon 111 is stably bonded to the solar cell sheet 112, and minimize the thickness difference caused by the soldering ribbon adhesive film 113.

[0043] In some examples of this embodiment, the weight of the supplementary adhesive film 140 is 90 g / m 2 ~200g / m 2 For example, the weight of the supplementary adhesive film 140 may be 90 g / m 2 , 100g / m 2 , 120g / m 2, 140g / m 2 , 150g / m 2 , 160g / m 2 , 180g / m 2 , 200g / m 2 Alternatively, the weight of the supplementary adhesive film 140 may be between any two of the above weights.

[0044] In some examples of this embodiment, the thickness of the soldering ribbon adhesive film 113 and the thickness of the supplementary adhesive film 140 are both less than the thickness of the first adhesive film 130. Since the soldering ribbon adhesive film 113 and the supplementary adhesive film 140 are respectively arranged on both sides of the first adhesive film 130, the first adhesive film 130 will be deformed to a large extent at the junction of the soldering ribbon adhesive film 113 and the supplementary adhesive film 140 during the lamination process. By using a thicker first adhesive film 130, it is possible to ensure that the first adhesive film 130 remains intact during the lamination process, thereby ensuring a good packaging quality.

[0045] In some examples of this embodiment, the thickness of the first adhesive film 130 may be 0.2 mm to 0.6 mm. For example, the thickness of the first adhesive film 130 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, or the thickness of the first adhesive film 130 may be between any two of the above thicknesses.

[0046] In some examples of this embodiment, the thickness of the soldering tape adhesive film 113 may be 0.05 mm to 0.2 mm. For example, the thickness of the soldering tape adhesive film 113 may be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, or the thickness of the soldering tape adhesive film 113 may be in the range between any two of the above thicknesses.

[0047] In some examples of this embodiment, the thickness of the supplementary film 140 may be 0.05 mm to 0.2 mm. For example, the thickness of the supplementary film 140 may be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, or the thickness of the supplementary film 140 may be in the range between any two of the above thicknesses.

[0048] Figure 6 To place the solar cell 112 Figure 5 Schematic diagram of the structure on the first packaging board 120. Figure 6As shown, the surface of the solar cell sheet 112 has a residual area between the edge of the solar cell sheet 112 and the edge of the solder tape adhesive film 113, and the edge of the supplementary adhesive film 140 is located on the residual area. Further, the edge of the supplementary adhesive film 140 can be arranged flush with the edge of the solder tape adhesive film 113.

[0049] In other examples, the edge of the supplementary adhesive film 140 is located on the gap between two adjacent solar cell panels 112 .

[0050] Reference Figure 1 As shown, in some examples of this embodiment, the photovoltaic module further includes a second packaging board 160 and a second adhesive film 150, and the second adhesive film 150 and the second packaging board 160 are arranged on the side of the battery structure 110 away from the first packaging board 120, and the second adhesive film 150 is arranged between the battery structure 110 and the second packaging board 160. It can be understood that the first packaging board 120 can be used as the back packaging board of the photovoltaic module, and the second packaging board 160 can be used as the front packaging board of the photovoltaic module. With the first packaging board 120 as the back packaging board, the supplementary adhesive film 140 is also located on the back of the photovoltaic module, which can prevent the additionally arranged supplementary adhesive film 140 from affecting the light absorption rate of the solar cell sheet 112.

[0051] In some examples of this embodiment, a soldering ribbon 111 and a soldering ribbon adhesive film 113 may be provided between the solar cell panel 112 and the first packaging board 120, and a soldering ribbon 111 and a soldering ribbon adhesive film 113 may also be provided between the solar cell panel 112 and the second packaging board 160. Although there may be a thickness difference between the soldering ribbon adhesive films 113 located on the side of the solar cell panel 112 close to the second packaging board 160, the thickness difference may be compensated by the supplementary adhesive film 140 located on the side of the solar cell panel 112 close to the first packaging board 120, thereby reducing or avoiding the generation of bubbles during lamination.

[0052] In some examples of this embodiment, the supplementary adhesive film 140 and the solder tape adhesive film 113 may both be ethylene-vinyl acetate copolymer films. Further, the first adhesive film 130 may also be ethylene-vinyl acetate copolymer films, and the second adhesive film 150 may also be ethylene-vinyl acetate copolymer films.

[0053] Another embodiment of the utility model also provides a photovoltaic module, the structure of which is similar to Figure 1 The PV panels shown are essentially the same. Figure 1 The photovoltaic assembly shown in the figure may further include a reflective film 210 , and the reflective film 210 is disposed between the supplementary adhesive film 140 and the first packaging board 120 . Figure 7The cross-sectional structure diagram of the supplementary adhesive film 140, the reflective film 210 and the first packaging plate 120 in the photovoltaic module is shown in FIG. The reflective film 210 is used to reflect the light irradiated between the solar cell sheets 112, thereby improving the utilization rate of sunlight and further improving the efficiency of the photovoltaic module.

[0054] Reference Figure 7 As shown, in some examples of this embodiment, the reflective film 210 has a reflective surface close to the supplementary adhesive film 140, and the reflective surface is undulating. Further, the reflective surface may have a plurality of pyramid structures, which can reflect light with a smaller incident angle toward the solar cell sheet 112, thereby increasing the light intensity reflected to the solar cell sheet 112 and further improving the utilization rate of sunlight.

[0055] Reference Figure 7 As shown, in some examples of this embodiment, the reflective film 210 includes a polymer layer 212 and a metal layer 211 that are stacked, and the surface of the metal layer 211 that is away from the polymer layer 212 forms a reflective surface. The metal layer 211 has a high reflectivity for light, thereby further increasing the light flux reflected to the solar cell 112. Furthermore, the material of the polymer layer 212 can be polyethylene terephthalate, and the material of the metal layer 211 can be aluminum.

[0056] Reference Figure 7 As shown, in some examples of this embodiment, the thickness of the reflective film 210 can be set to be thinner to minimize the additional unevenness caused by the additional reflective film 210. In some examples of this embodiment, the thickness of the reflective film 210 can be 0.01 mm to 0.1 mm. For example, the thickness of the reflective film 210 can be 0.01 mm, 0.02 mm, 0.03 mm, 0.05 mm, 0.07 mm, 0.09 mm, 0.1 mm, or the thickness of the reflective film 210 can be between any two of the above thicknesses.

[0057] Reference Figure 7 As shown, in some examples of this embodiment, the photovoltaic module further includes a reflective adhesive film 220, which is disposed between the reflective film 210 and the first encapsulation board 120. The reflective adhesive film 220 is used to bond the reflective film 210 to the first encapsulation board 120. Further, the reflective adhesive film 220 may be an ethylene-vinyl acetate copolymer film.

[0058] Some traditional technologies also set reflective film in photovoltaic modules, but the reflective film is not combined with the supplementary film in the utility model. When the reflective film is set alone, since the hardness of the reflective film is usually high, the reflective film is easy to cause uneven stress at the edge of the solar cell during the lamination process, thereby increasing the risk of hidden cracks in the solar cell. In addition, since the surface of the reflective film usually contains a metal coating, when the solar cell or the welding ribbon penetrates the packaging film, it is easy to contact with the metal coating, thereby causing a short circuit. The lower the weight of the packaging film and the thinner its thickness, the higher the risk of short circuit.

[0059] In this embodiment, by arranging the reflective film 210 between the supplementary adhesive film 140 and the first packaging board 120, the supplementary adhesive film 140 can, on the one hand, separate the reflective film 210 from the solar cell sheet 112, thereby reducing the risk of the solar cell sheet 112 or the welding ribbon 111 being directly short-circuited to the reflective film 210, and on the other hand, can also play a buffering role, improve the problem of uneven stress caused by the reflective film 210, and reduce the risk of hidden cracks in the solar cell sheet 112. Therefore, when the reflective film 210 and the supplementary adhesive film 140 are arranged at the same time, the supplementary adhesive film 140 can also solve many problems caused by the reflective film 210 itself. In addition, arranging the supplementary adhesive film 140 on the side of the reflective film 210 away from the first packaging board 120 will not generate additional processing steps in the actual preparation process, so it is undoubtedly also highly feasible.

[0060] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A photovoltaic module, characterized in that: include: A battery structure (110), a first packaging plate (120), a first adhesive film (130), and a supplementary adhesive film (140); The battery structure (110) comprises a welding strip (111), a plurality of welding strip adhesive films (113) and a plurality of solar cell sheets (112); the welding strip (111) is connected to an electrode on the solar cell sheet (112); each welding strip adhesive film (113) is arranged on a corresponding solar cell sheet (112); and the welding strip adhesive film (113) is bonded to the welding strip (111) and the corresponding solar cell sheet (112); and there is a gap between adjacent welding strip adhesive films (113); The first adhesive film (130) and the battery structure (110) are sequentially stacked on the first packaging board (120), the supplementary adhesive film (140) is attached to a side of the first packaging board (120) close to the first adhesive film (130), and the position of the supplementary adhesive film (140) corresponds to the gap between adjacent soldering ribbon adhesive films (113).

2. The photovoltaic module according to claim 1, characterized in that: The photovoltaic assembly further comprises a reflective film (210), wherein the reflective film (210) is arranged between the supplementary adhesive film (140) and the first packaging plate (120).

3. The photovoltaic module according to claim 2, characterized in that: The reflective film (210) has a reflective surface close to the supplementary adhesive film (140), and the reflective surface is undulating.

4. The photovoltaic module according to claim 3, characterized in that: The reflective film (210) comprises a polymer layer (212) and a metal layer (211) which are stacked, and a surface of the metal layer (211) on one side away from the polymer layer (212) forms the reflective surface.

5. The photovoltaic module according to claim 2, characterized in that: The photovoltaic assembly further comprises a reflective adhesive film (220), wherein the reflective adhesive film (220) is arranged between the reflective film (210) and the first packaging plate (120).

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The ratio of the gram weight of the welding tape adhesive film (113) to the gram weight of the supplementary adhesive film (140) is 1:(0.8-1.2).

7. The photovoltaic module according to claim 6, characterized in that: The welding tape adhesive film (113) has a gram weight of 90 g / m 2 ~200g / m 2 and / or, The first adhesive film (130) has a grammage of less than 300 g / m 2 and / or, The weight of the supplementary adhesive film (140) is 90 g / m 2 ~200g / m 2 .

8. The photovoltaic module according to any one of claims 1 to 5 and 7, characterized in that: The surface of the solar cell sheet (112) has a residual area between the edge of the solar cell sheet (112) and the edge of the welding tape adhesive film (113), and the edge of the supplementary adhesive film (140) is located on the residual area, or the edge of the supplementary adhesive film (140) is located in the gap between two adjacent solar cell sheets (112).

9. The photovoltaic module according to any one of claims 1 to 5 and 7, characterized in that: The photovoltaic module further comprises a second encapsulation plate (160) and a second adhesive film (150); the second adhesive film (150) and the second encapsulation plate (160) are arranged on a side of the battery structure (110) away from the first encapsulation plate (120), and the second adhesive film (150) is arranged between the battery structure (110) and the second encapsulation plate (160).

10. The photovoltaic module according to any one of claims 1 to 5 and 7, characterized in that: The supplementary adhesive film (140) and the soldering tape adhesive film (113) are both ethylene-vinyl acetate copolymer films.

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