Photovoltaic module and photovoltaic power station

Abstract

The utility model discloses a photovoltaic assembly and a photovoltaic power station, and relates to the technical field of photovoltaic assemblies. The photovoltaic module comprises cover plate glass, an upper adhesive film, a battery array, a lower adhesive film and a transparent back plate adhered with a first reflecting film and a second reflecting film which are sequentially laminated from top to bottom, wherein the first reflecting film is arranged corresponding to a piece gap between battery pieces in the battery array and / or a string gap between battery strings in the battery array; the second reflecting film is arranged in an edge area of the transparent back plate corresponding to the outer edge of the battery array and in a middle area of the transparent back plate containing a lead hole, and the extending direction of the middle area containing the lead hole is perpendicular to the extending direction of the battery string. According to the embodiment, sunlight penetrating through the periphery and gaps of the cell array can be effectively reflected, so that the sunlight is reused by the solar cell, and the photoelectric conversion efficiency of the photovoltaic module is further improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a photovoltaic module and a photovoltaic power station. Background Technology

[0002] Photovoltaic (PV) modules convert solar energy into electrical energy. To improve the photoelectric conversion efficiency of PV modules, the amount of sunlight reflected to the surface of the solar cells can be increased under the same light intensity. However, in double-glass PV modules, sunlight can pass through areas of the transparent backsheet not covered by the cell array, resulting in a significant amount of solar energy being wasted as it cannot be reflected to the surface of the solar cells, thus limiting the performance of the PV module. Utility Model Content

[0003] In view of this, the present invention provides a photovoltaic module and a photovoltaic power station, which can improve the photoelectric conversion efficiency of the photovoltaic module by attaching a transparent backplate with a first reflective film and a second reflective film.

[0004] To achieve the above objectives, according to one aspect of the present invention, a photovoltaic module is provided, comprising:

[0005] The following layers are stacked from top to bottom: cover glass, upper adhesive film, battery array, lower adhesive film, and transparent back plate with first and second reflective films attached.

[0006] The first reflective film is provided in accordance with the gap between the cells in the battery array and / or the gap between the strings in the battery array.

[0007] The second reflective film is disposed on the edge region of the transparent back plate corresponding to the outer edge of the battery array and the middle region of the transparent back plate containing the lead hole, and the extension direction of the middle region containing the lead hole is perpendicular to the extension direction of the battery string.

[0008] Optionally, the thickness of the second reflective film is 0.1 mm to 0.3 mm, and the basis weight of the second reflective film is 100 g / m². 2 ~300g / m 2 .

[0009] Optionally, for the second reflective film extending in the width direction of the aforementioned transparent back plate, its length is less than or equal to the width of the aforementioned transparent back plate, and the width direction of the aforementioned transparent back plate is consistent with the extension direction of the intermediate region including the aforementioned lead hole.

[0010] The second reflective film extending along the length of the aforementioned transparent backplate has a length less than or equal to the length of the aforementioned transparent backplate, and the length direction of the aforementioned transparent backplate is perpendicular to the extension direction of the intermediate region containing the aforementioned lead hole.

[0011] Optionally, for each of the two ends in the extension direction of the second reflective film, the distance between the end and the edge of the transparent back plate it is close to is 3mm to 5mm;

[0012] Optionally, the distance between the outer side of the second reflective film disposed corresponding to the outer edge of the battery array and the edge of the transparent back plate it is close to is 3mm to 5mm.

[0013] Optionally, the width of the second reflective film is 4mm to 20mm.

[0014] Optionally, the second reflective film includes one or more of the following structures: a white monolayer structure formed by ethylene-vinyl acetate copolymer, a white monolayer structure formed by polyolefin elastomer, a white monolayer structure formed by butyl rubber, or a co-extruded white composite structure formed by ethylene-vinyl acetate copolymer, polyolefin elastomer, and ethylene-vinyl acetate copolymer.

[0015] Optionally, the width of the first reflective film provided corresponding to the above-mentioned gap is greater than or equal to the width of the above-mentioned gap;

[0016] And / or,

[0017] The width of the first reflective film corresponding to the aforementioned string gap is greater than or equal to the width of the aforementioned string gap.

[0018] Optionally, the first reflective film and the second reflective film are disposed on the main surface of the transparent back plate facing the lower adhesive film.

[0019] To achieve the above objectives, according to another aspect of the present invention, a photovoltaic power station is provided, including the photovoltaic module of the present invention.

[0020] One embodiment of the above-mentioned utility model has the following advantages or beneficial effects: by attaching a transparent backplate with a first reflective film and a second reflective film, sunlight passing around and between the battery array can be effectively reflected, and the reflected sunlight can be reused by the solar cells, further improving the photoelectric conversion efficiency of the photovoltaic module.

[0021] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0022] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the stacked battery array and transparent backplate according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of a transparent backplate with a first reflective film and a second reflective film pasted on it according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of a structure according to an embodiment of the present invention, showing that the width of the first reflective film corresponding to the gap between the sheets is greater than the width of the gap between the sheets;

[0027] Figure 5 This is a schematic diagram of the structure of the first reflective film according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the first reflective film according to another embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the stacked structure of a battery array and a transparent backplate with a second reflective film according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of a battery array and a transparent backplate with a second reflective film stacked according to another embodiment of the present invention.

[0031] Figure label:

[0032] 1-Cover glass; 2-Top adhesive film; 3-Battery array; 301-String gap; 302-Sheet gap; 4-Under adhesive film; 5-Transparent backplate; 51-Lead hole; 501-Edge area; 502-Center area; 6-First reflective film; 601-First adhesive layer; 602-Substrate layer; 603-Second adhesive layer; 604-Metallic reflective layer; 7-Second reflective film; Detailed Implementation

[0033] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0034] It should be noted that, where there is no conflict, the embodiments of this utility model and the technical features in the embodiments can be combined with each other.

[0035] Figure 1This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present utility model. Figure 1 As shown, the structure of the photovoltaic module in this embodiment mainly includes: a cover glass 1, an upper adhesive film 2, a battery array 3, a lower adhesive film 4, and a transparent backplate 5 with a first reflective film 6 and a second reflective film 7 pasted on it, stacked from top to bottom.

[0036] Among them, battery array 3 refers to a power generation unit composed of several solar cells assembled in a certain way, such as including several parallel battery strings, each battery string including several series-connected battery cells.

[0037] In the transparent backplate 5 with the first reflective film 6 and the second reflective film 7 attached, the first reflective film 6 is disposed corresponding to the gap 302 between the battery cells in the battery array 3 and / or the gap 301 between the battery strings in the battery array 3; the second reflective film 7 is disposed in the edge region 501 of the transparent backplate 5 corresponding to the outer edge of the battery array 3 and the middle region 502 of the transparent backplate 5 containing the lead hole 51, and the extending direction of the middle region 502 containing the lead hole 51 is perpendicular to the extending direction of the battery string. The outer edge of the battery array 3 refers to the edge of the transparent backplate 5 closest to the transparent backplate 5 in the orthographic projection of the battery array 3 on the transparent backplate 5, and the edge region 501 of the transparent backplate 5 corresponding to the outer edge of the battery array 3 refers to the region between the edge of the transparent backplate 5 and the edge of the transparent backplate 5 in the orthographic projection of the battery array 3 on the transparent backplate 5.

[0038] Specifically, such as Figure 2 As shown, when the battery array 3 is placed on the transparent backplate 5 (the lower adhesive film 4 between the battery array 3 and the transparent backplate 5 is not shown), there is a string gap 301 between adjacent battery strings in the battery array 3, and a sheet gap 302 between adjacent cells in each battery string. An edge region 501 exists in the transparent backplate 5 from the outer edge of the battery array 3 to the edge of the transparent backplate 5; a lead hole 51 corresponding to the junction box of the photovoltaic module frame is provided in the middle of the transparent backplate 5, and the area where the lead hole 51 is located is the middle region 502. Figure 3 As shown (battery array 3 not shown), in order to solve the problem of sunlight passing through the string gap 301, the sheet gap 302, the edge region 501 and the middle region 502, this embodiment of the invention provides a first reflective film 6 in the transparent back plate 5 corresponding to the string gap 301 and the sheet gap 302, and a second reflective film 7 in the edge region 501 and the middle region 502 of the transparent back plate 5. Through the cooperation of the first reflective film 6 and the second reflective film 7, some sunlight can be reflected to the surface of the solar cells, thereby improving the performance of the photovoltaic module.

[0039] In an optional embodiment, the first reflective film 6, corresponding to the gap 302, has a width greater than or equal to the width of the gap 302, and a length equal to the length of the gap 302. Thus, the first reflective film 6, adhered to the transparent backsheet 5, completely blocks sunlight passing through the gap 302 and reflects sunlight back to the surface of the solar cells, further enhancing the performance of the photovoltaic module.

[0040] As an example, such as Figure 4 As shown, the width of the first reflective film 6 corresponding to the gap 302 can be greater than the width of the gap 302 to avoid light leakage and thus maximize the amount of sunlight emitted by the first reflective film 6. It should be noted that... Figure 4 The diagram only illustrates the relative positional relationship between the gap 302 between two adjacent battery cells and the first reflective film 6 corresponding to the gap 302. In reality, there may be multiple battery cells, gaps 302, and first reflective films 6, which are not limited here.

[0041] In an optional embodiment, the first reflective film 6 corresponding to the string gap 301 has a width greater than or equal to the width of the string gap 301, and its length is the same as the length of the string gap 301. This allows the first reflective film 6, adhered to the transparent backsheet 5, to block sunlight passing through the string gap 301 and reflect some sunlight onto the surface of the solar cells, further enhancing the performance of the photovoltaic module. As an example, similar to the first reflective film 6 corresponding to the cell gap 302, the width of the first reflective film 6 corresponding to the string gap 301 can be greater than the width of the string gap 301 to avoid light leakage and maximize the amount of sunlight emitted by the first reflective film 6.

[0042] In one alternative embodiment, such as Figure 5 As shown, the first reflective film 6 may include a first adhesive layer 601, a substrate layer 602, and a second adhesive layer 603. The first adhesive layer 601 may include ethylene-vinyl acetate copolymer (EVA), the substrate layer 602 may include polyethylene terephthalate (PET), and the second adhesive layer 603 may include EVA. As an example, the first reflective film 6 may be a three-layer composite structure composed of EVA-PET-EVA layers. The PET reflects sunlight, thereby improving the performance of the photovoltaic module. The EVA in the first adhesive layer 601 may be modified EVA, such as by adding coupling agents to increase the tensile strength and water resistance of the EVA.

[0043] Furthermore, the first adhesive layer 601 of the first reflective film 6 is disposed on the side away from the transparent back sheet 5, so that when the photovoltaic module is working, sunlight can directly irradiate the first reflective film 6 through the gap 302 and the string gap 301, and then achieve light reflection through the substrate layer 602 in the first reflective film 6.

[0044] Optionally, the surface of the first reflective film 6 where the first adhesive layer 601 is disposed can be configured as a pyramid structure, thereby further enhancing the reflectivity of the first reflective film 6.

[0045] In one alternative embodiment, such as Figure 6 As shown, the first reflective film 6 may include a metal reflective layer 604, a substrate layer 602, and a second adhesive layer 603. The metal reflective layer may include aluminum. The metal reflective layer 604 may be disposed on the surface of the substrate layer 602 away from the second adhesive layer 603. By providing the metal reflective layer 604, based on the high reflectivity of metal, the first reflective film 6 can achieve efficient reflection of sunlight, increasing the amount of sunlight reflected to the surface of the solar cell and improving the performance of the photovoltaic module.

[0046] It should be noted that the metal reflective layer 604 of the first reflective film 6 is disposed on the side away from the transparent back sheet 5, so that when the photovoltaic module is working, sunlight can directly irradiate the metal reflective layer 604 of the first reflective film 6 through the gap 302 and the string gap 301, and then the light is reflected by the metal reflective layer 604 through the first reflective film 6.

[0047] Optionally, the surface of the first reflective film 6 with the metal reflective layer 604 can be configured as a pyramid structure to further enhance the reflectivity of the first reflective film 6.

[0048] In one optional embodiment, the length of the second reflective film 7 extending in the width direction of the transparent back plate 5 is less than or equal to the width of the transparent back plate 5, and the width direction of the transparent back plate 5 is consistent with the extension direction of the intermediate region 502 containing the lead hole 51; the length of the second reflective film 7 extending in the length direction of the transparent back plate 5 is less than or equal to the length of the transparent back plate 5, and the length direction of the transparent back plate 5 is perpendicular to the extension direction of the intermediate region 502 containing the lead hole 51.

[0049] Optionally, such as Figure 7As shown, for the second reflective film 7 pasted on the edge region 501 and the middle region 502 of the transparent back plate 5, the length of the second reflective film 7 extending in the width direction of the transparent back plate 5 can be the same as the width of the transparent back plate 5, and the length of the second reflective film 7 extending in the length direction of the transparent back plate 5 can be the same as the length of the transparent back plate 5. Thus, the second reflective film 7 covers the entire edge region 501 of the transparent back plate 5, preventing light leakage and ensuring the reflection effect.

[0050] like Figure 8 As shown, for the second reflective film 7 pasted on the edge region 501 and the middle region 502 of the transparent backsheet 5, the length of the second reflective film 7 extending in the width direction of the transparent backsheet 5 can be less than the width of the transparent backsheet 5, and the length of the second reflective film 7 extending in the length direction of the transparent backsheet 5 can be less than the length of the transparent backsheet 5. The second reflective film 7 does not cover the entire edge region 501 of the transparent backsheet 5. The second reflective film 7 does not need to be set in the area that the photovoltaic module frame may cover, thereby reducing the amount of second reflective film 7 used and reducing costs.

[0051] It should be noted that the width direction of the transparent backplate 5 is consistent with the extension direction of the intermediate region 502 containing the lead hole 51, and the length direction of the transparent backplate 5 is perpendicular to the extension direction of the intermediate region 502 containing the lead hole 51. This is only an example illustrating one possible relationship between the width and length directions of the transparent backplate 5 and the extension direction of the intermediate region 502 containing the lead hole 51. In actual photovoltaic modules, there may be other situations, such as the width direction of the transparent backplate 5 being perpendicular to the extension direction of the intermediate region 502 containing the lead hole 51, and the length direction of the transparent backplate 5 being consistent with the extension direction of the intermediate region 502 containing the lead hole 51.

[0052] In one optional embodiment, for each of the two ends extending in the direction of the second reflective film 7, the distance between the end and the edge of the adjacent transparent backplate 5 is 3mm to 5mm. Specifically, if the extension direction of the second reflective film 7 is consistent with the width direction of the transparent backplate 5, the end of the second reflective film 7 near the long side of the transparent backplate 5 is 3mm to 5mm away from the long side of the transparent backplate 5; if the extension direction of the second reflective film 7 is consistent with the length direction of the transparent backplate 5, the end of the second reflective film 7 near the wide side of the transparent backplate 5 is 3mm to 5mm away from the wide side of the transparent backplate 5, thereby reducing the area of ​​the second reflective film 7 covered by the module frame, reducing the amount of second reflective film 7 used, and reducing the manufacturing cost of the photovoltaic module. As an example, for each of the two ends extending in the direction of the second reflective film 7, the distance between the end and the edge of the adjacent transparent backplate 5 can be 3mm, 3.4mm, 3.8mm, 4mm, 4.5mm, or 5mm, etc.

[0053] In one optional embodiment, the distance between the outer side of the second reflective film 7, which is disposed corresponding to the outer edge of the aforementioned battery array 3, and the edge of the adjacent transparent backplate 5 is 3mm to 5mm. Specifically, the distance between the outer side of the second reflective film 7, which is attached to the edge region 501, and the edge of the transparent backplate 5, can be 3mm to 5mm, thereby reducing the area of ​​the second reflective film 7 covered by the module frame, reducing the amount of second reflective film 7 used, and reducing the manufacturing cost of the photovoltaic module. As an example, the distance between the outer side of the second reflective film 7, which is disposed corresponding to the outer edge of the aforementioned battery array 3, and the edge of the adjacent transparent backplate 5 can be 3mm, 3.3mm, 3.7mm, 4mm, 4.4mm, 4.8mm, or 5mm, etc.

[0054] It should be noted that the width of the second reflective film 7 pasted on the middle area 502 of the transparent backplate 5 can be the same as the width of the middle area 502, and the length can be the same as the length of the middle area 502, without needing to reserve a distance from the edge.

[0055] Furthermore, the thickness of the second reflective film 7 can be 0.1 mm to 0.3 mm, and the basis weight of the second reflective film 7 is 100 g / m². 2 ~300g / m 2 As an example, the thickness of the second reflective film 7 can be 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, or 0.3 mm, etc.; the ratio of the mass of the second reflective film 7 to its coverage area on the transparent backing plate 5 can be 100 g / m². 2 140g / m 2 160g / m 2 200g / m 2 250g / m 2 Or 300g / m 2 By setting the thickness and weight of the second reflective film, the actual thickness of the second reflective film 7 in the photovoltaic module can be effectively controlled, avoiding the second reflective film 7 being too thin, resulting in poor reflection, or too thick, affecting the cost and reliability of the photovoltaic module. Specifically, the thickness of the second reflective film 7 can be 0.1mm to 0.3mm, meaning the average thickness of the second reflective film 7 or the thickness at any given location is equal to 0.1mm, 0.3mm, or any value greater than 0.1mm and less than 0.3mm. The thickness of the second reflective film 7 refers to the distance between its surface facing sunlight and its surface away from sunlight, that is, the distance between the upper and lower surfaces of the second reflective film 7.

[0056] The width of the second reflective film 7 can be 4 to 20 mm. As an example, the width of the second reflective film 7 can be 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 16 mm or 20 mm, etc.

[0057] In an optional embodiment, the second reflective film 7 includes one or more of the following structures: a white monolayer structure formed by ethylene-vinyl acetate copolymer, a white monolayer structure formed by polyolefin elastomer (POE), a white monolayer structure formed by butyl rubber, or a co-extruded white composite structure formed by ethylene-vinyl acetate copolymer, polyolefin elastomer, and ethylene-vinyl acetate copolymer.

[0058] By employing a second reflective film 7 comprising one or more of the following structures: a white monolayer structure formed from ethylene-vinyl acetate copolymer (EVA), a white monolayer structure formed from polyolefin elastomer (POE), a white monolayer structure formed from butyl rubber, or a co-extruded white composite structure formed from ethylene-vinyl acetate copolymer, polyolefin elastomer, and ethylene-vinyl acetate copolymer, the reflective films provided in the corresponding areas of the interlayer gap 302 and string gap 301 and the edge area 501 and the middle area 502 can be separated. This avoids the problem of interlayer peeling that may occur when the same structure as the first reflective film 6 is used in the edge area 501 and the middle area 502 where the lead hole 51 is provided. The second reflective film 7 is less prone to interlayer peeling and can effectively block moisture from entering the module, extending the service life of the photovoltaic module. At the same time, the second reflective film 7 does not have a metal reflective layer 604 on its surface, which can effectively avoid leakage problems at the edges and lead hole 51. Furthermore, by setting the second reflective film 7, the phenomenon of edge aging and delamination of the module can be reduced, ensuring the reliability of the photovoltaic module and reducing the risk of edge insulation failure. The combination of the first reflective film 6 and the second reflective film 7 effectively improves the photoelectric conversion efficiency of the photovoltaic module, increasing its power by approximately 2.5 watts.

[0059] When the second reflective film 7 is a white single-layer structure formed of EVA, the EVA can be pre-crosslinked EVA with a crosslinking degree of 20% to 50%. For example, the crosslinking degree of the pre-crosslinked EVA used can be 20%, 25%, 30%, 35%, 40%, 45%, or 50%, etc. Pre-crosslinked EVA with a certain crosslinking structure formed through the crosslinking reaction can improve the strength of EVA, enhance its heat resistance and tensile strength. Using pre-crosslinked EVA as the second reflective film 7 can further prevent moisture from entering from the edges during the operation of the photovoltaic module.

[0060] The melt flow index of EVA used to form the white monolayer structure can be from 5 g / 10 min to 15 g / 10 min. For example, the melt flow index of EVA used to form the white monolayer structure can be 5 g / 10 min, 8 g / 10 min, 10 g / 10 min, 12 g / 10 min, or 15 g / 10 min, etc. By setting the melt flow index of the EVA material, its fluidity can be reduced, preventing the second reflective film 7 from overflowing due to compression during the photovoltaic module lamination process.

[0061] The reflectivity of EVA used to form a white single-layer structure can be greater than 90%. For example, the reflectivity of EVA used to form a white single-layer structure can be 90.5%, 91%, 93%, 95%, 97%, or 99%, etc. By selecting EVA with higher reflectivity, the photoelectric conversion efficiency of photovoltaic modules can be further improved.

[0062] In an optional embodiment, the first reflective film 6 and the second reflective film 7 are disposed on the main surface of the transparent back plate 5 facing the lower adhesive film 4.

[0063] According to the photovoltaic module of this utility model embodiment, by attaching a transparent backplate 5 with a first reflective film 6 and a second reflective film 7, sunlight passing through the periphery and gaps of the battery array 3 can be effectively reflected. The reflected sunlight can be reused by the solar cells, further improving the photoelectric conversion efficiency of the photovoltaic module.

[0064] This utility model embodiment also provides a photovoltaic power station, including the photovoltaic module of this utility model embodiment. The photovoltaic module may include: a cover glass 1, an upper adhesive film 2, a cell array 3, a lower adhesive film 4, and a transparent back plate 5 with a first reflective film 6 and a second reflective film 7 attached thereon, stacked sequentially from top to bottom. The first reflective film 6 is disposed corresponding to the gap 302 between the cells in the cell array 3 and / or the string gap 301 between the cell strings in the cell array 3; the second reflective film 7 is disposed on the edge region 501 of the transparent back plate 5 corresponding to the outer edge of the cell array 3 and the middle region 502 of the transparent back plate 5 containing lead holes 51, the extension direction of the middle region 502 containing the lead holes 51 being perpendicular to the extension direction of the cell strings.

[0065] According to the photovoltaic power station of this utility model embodiment, by setting a photovoltaic module with a transparent backplate 5 with a first reflective film 6 and a second reflective film 7 attached, the sunlight passing through the periphery and gaps of the battery array 3 can be effectively reflected. The reflected sunlight can be reused by the solar cells, further improving the photoelectric conversion efficiency of the photovoltaic module.

[0066] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A photovoltaic module, characterized by, Comprising: a cover glass (1), an upper adhesive film (2), a battery array (3), a lower adhesive film (4), a transparent back sheet (5) with a first reflective film (6) and a second reflective film (7) adhered thereto, stacked in order from top to bottom; wherein the first reflective film (6) is arranged corresponding to the inter-cell gap (302) between the battery pieces in the battery array (3) and / or the inter-string gap (301) between the battery strings in the battery array (3); the second reflective film (7) is arranged in the edge region (501) of the transparent back sheet (5) corresponding to the outer edge of the battery array (3) and the middle region (502) of the transparent back sheet (5) containing the lead hole (51), and the extension direction of the middle region (502) containing the lead hole (51) is perpendicular to the extension direction of the battery string.

2. The photovoltaic module of claim 1, wherein, The thickness of the second reflecting film (7) is 0.1mm~0.3mm, and the gram weight of the second reflecting film (7) is 100g / m 2 ~300g / m 2 .

3. The photovoltaic module according to claim 1, wherein for the second reflective film (7) extending in the width direction of the transparent back sheet (5), the length thereof is less than or equal to the width of the transparent back sheet (5), and the width direction of the transparent back sheet (5) is consistent with the extension direction of the middle region (502) containing the lead hole (51); for the second reflective film (7) extending in the length direction of the transparent back sheet (5), the length thereof is less than or equal to the length of the transparent back sheet (5), and the length direction of the transparent back sheet (5) is perpendicular to the extension direction of the middle region (502) containing the lead hole (51).

4. The photovoltaic module according to claim 1 or 3, wherein for each of the two ends of the second reflective film (7) in the extension direction, the distance between the end and the edge of the transparent back sheet (5) adjacent thereto is 3-5 mm.

5. The photovoltaic module of claim 1 or 3, wherein, for the outer side of the second reflective film (7) arranged corresponding to the outer edge of the battery array (3), the distance between the outer side and the edge of the transparent back sheet (5) adjacent thereto is 3-5 mm.

6. The photovoltaic module according to claim 1, wherein the width of the second reflective film (7) is 4-20 mm.

7. The photovoltaic module of claim 1, wherein, the second reflective film (7) comprises one or more of the following structures: a white single-layer structure formed of ethylene-vinyl acetate copolymer, a white single-layer structure formed of polyolefin elastomer, a white single-layer structure formed of butyl rubber, or a co-extrusion type white composite structure formed of ethylene-vinyl acetate copolymer, polyolefin elastomer, and ethylene-vinyl acetate copolymer.

8. The photovoltaic module according to claim 1, wherein for the first reflective film (6) arranged corresponding to the inter-cell gap (302), the width thereof is greater than or equal to the width of the inter-cell gap (302); and / or, for the first reflective film (6) arranged corresponding to the inter-string gap (301), the width thereof is greater than or equal to the width of the inter-string gap (301).

9. The photovoltaic module of claim 1, wherein, the first reflective film (6) and the second reflective film (7) are arranged on the main surface of the transparent back sheet (5) facing the lower adhesive film (4).

10. A photovoltaic power plant, characterized in that, comprising the photovoltaic module according to any one of claims 1-9.

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