Reflective film strips and photovoltaic modules

Abstract

This application relates to a reflective film strip, comprising a substrate with an adhesive layer on its bottom surface for bonding to the backsheet of a photovoltaic module; and a metallic reflective layer disposed on the top surface of the substrate, the metallic reflective layer comprising a plurality of reflective areas arranged along a first direction X, with a first gap between adjacent reflective areas. Because the metallic reflective layer is discontinuously arranged in the first direction X, and the first gap corresponds to a second gap between the solder strips of adjacent battery packs, and the orthographic projection of the first gap on the backsheet at least partially overlaps with the orthographic projection of the second gap on the backsheet, the metallic reflective layer below the second gap is guaranteed to be disconnected. Therefore, even if the two solder strips on either side of the second gap pierce the encapsulating film, the metallic reflective layer will not cause the solder strips of adjacent battery packs to conduct, preventing a short circuit in the photovoltaic module. Furthermore, a photovoltaic module is also proposed.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and in particular to a reflective film strip and a photovoltaic module. Background Technology

[0002] In existing technologies, an aluminum-containing reflective film strip is provided on the backsheet of photovoltaic modules. The length direction of the aluminum-containing reflective film strip is aligned with the direction of the gap between adjacent solar cells. The reflective film strip is used to reflect light incident on the backsheet back to the solar cells, thereby improving the light utilization rate of the photovoltaic module and ensuring the power generation efficiency of the photovoltaic module.

[0003] During the lamination process of photovoltaic modules, the solder ribbons in the cell array may puncture the post-encapsulation film between the aluminum reflective film strip and the cell array. The reflective film strip may cause the solder ribbons of adjacent cell arrays to connect, resulting in a short circuit in the photovoltaic module. Summary of the Invention

[0004] Therefore, it is necessary to provide a reflective film strip to address the potential short circuit issue in photovoltaic modules. A photovoltaic module is also proposed.

[0005] According to one aspect of this application, a reflective film strip includes: a substrate, wherein an adhesive layer is provided on the bottom surface of the substrate for bonding to the backsheet of a photovoltaic module; and a metal reflective layer disposed on the top surface of the substrate, wherein the metal reflective layer includes a plurality of reflective areas arranged along a first direction, and a first gap is provided between two adjacent reflective areas.

[0006] In some embodiments, the length of the first gap in the first direction is 0.05 mm to 0.3 mm.

[0007] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm; in the first direction, the length of any one of the reflective areas is less than 15.5 mm.

[0008] According to another aspect of this application, a photovoltaic module includes a cover glass, a front encapsulation film, a battery string module, a rear encapsulation film, and a backsheet. The battery string module includes multiple battery packs arranged along a first direction. Each battery pack includes multiple cells sequentially arranged along a second direction intersecting the first direction. Adjacent cells in each battery pack are connected to each other via solder strips in the second direction. In the first direction, the minimum interval between the solder strips of adjacent battery packs is a second gap. A metallic reflective layer is bonded to the side of the backsheet facing the rear encapsulation film. The metallic reflective layer includes multiple reflective areas arranged along the first direction. A first gap exists between adjacent reflective areas. Each first gap corresponds one-to-one with each second gap, and the orthographic projection of the first gap on the backsheet at least partially overlaps with the orthographic projection of the second gap on the backsheet.

[0009] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm. In the second direction, two adjacent battery cells in the battery pack are connected to each other by multiple solder strips. The multiple solder strips are arranged along the first direction. The interval between the solder strip at the tail end in the first direction of each battery pack and the solder strip at the head end in the first direction of the adjacent battery pack is the second gap.

[0010] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm. In the first direction, the length of the first gap is less than the length of the group gap between two adjacent battery packs.

[0011] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm, the length of the second gap is 15.5 mm to 22 mm, and the length of the group gap is 1.5 mm to 2 mm.

[0012] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm. In the second direction, multiple metal reflective layers are provided, and each metal reflective layer corresponds to the gap between two battery cells.

[0013] In the first direction, the length of the first gap is 0.05 mm to 0.3 mm. It also includes multiple surfaces in the first direction, the length of the first gap is 0.05 mm to 0.3 mm. The reflective strip is located between the metal reflective layer and the back plate. The material of the continuous reflective part is metal.

[0014] In this application, because the metallic reflective layer is discontinuously arranged in the first direction, and the first gap corresponds to the second gap between the solder ribbons of adjacent battery packs, and the orthographic projection of the first gap on the back panel at least partially overlaps with the orthographic projection of the second gap on the back panel, it is ensured that the metallic reflective layer below the second gap is necessarily broken. Therefore, even if the two solder ribbons on both sides of the second gap pierce the encapsulating film, the metallic reflective layer will not cause the solder ribbons of the two adjacent battery packs to conduct. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of a photovoltaic module according to an embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the reflective film strip according to an embodiment of this application.

[0017] Figure 3 This is a schematic diagram showing the relative positional relationship between the reflective film strip and the battery pack in this application.

[0018] Figure 4 This is a circuit diagram of a photovoltaic module according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram showing the relative positions of the reflective film strip, reflective strips, and battery pack.

[0020] Figure label:

[0021] 100. Photovoltaic module; 10. Reflective film strip; 110. Substrate; 111. Adhesive layer; 120. Metallic reflective layer; 121. Reflective area; 122. First gap; 20. Cover glass; 30. Front encapsulation film; 40. Battery string module; 410. Battery pack; 411. Battery cell; 412. Solder strip; 420. Second gap; 50. Rear encapsulation film; 60. Backsheet; 70. Reflective strip. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0028] As described in the background section, in the prior art, the reflective film strip is placed between the backsheet and the encapsulating film. However, during the photovoltaic module lamination process, the solder ribbon may puncture the encapsulating film and become conductive with the reflective film strip, thereby causing a short circuit in the photovoltaic module.

[0029] Therefore, one aspect of this application provides a reflective film strip that, when applied to photovoltaic modules, can prevent the solder strips of adjacent cells from conducting, thereby avoiding short circuits in the photovoltaic modules and ensuring the utilization rate of light and the power generation efficiency of the photovoltaic modules.

[0030] like Figure 1 As shown, Figure 1 This is a cross-sectional structural diagram of the photovoltaic module 100 according to an embodiment of this application, specifically illustrating the relative positional relationship of each element in the photovoltaic module 100 before lamination. Figure 2 The cross-sectional structure of the reflective film strip 10 according to an embodiment of this application is illustrated. Figure 3 This illustrates the relative positional relationship between the reflective film strip 10 and the battery pack 410 in the photovoltaic module 100.

[0031] like Figure 1 As shown, the photovoltaic module 100 includes a reflective film strip 10, a cover glass 20, a front encapsulation film 30, a cell string module 40, a rear encapsulation film 50, and a backsheet 60. The reflective film strip 10 is disposed on the upper surface of the backsheet 60, and the rear encapsulation film 50, the cell string module 40, the front encapsulation film 30, and the cover glass 20 are sequentially laid on the upper surface of the backsheet 60. After the photovoltaic module 100 is laminated, the reflective film strip 10 is located between the rear encapsulation film 50 and the backsheet 60.

[0032] like Figure 2 As shown, the reflective film strip 10 includes a substrate 110 and a metallic reflective layer 120. An adhesive layer 111 is provided on the bottom surface of the substrate 110, which is used to bond to the backsheet 60 of the photovoltaic module 100. The metallic reflective layer 120 is disposed on the top surface of the substrate 110, and includes a plurality of reflective areas 121 arranged along a first direction, with a first gap 122 between adjacent reflective areas 121.

[0033] The reflective film strip 10 is fixed to the backing plate 60 by bonding it to the backing plate 60 via the adhesive layer 111. Before the reflective film strip 10 is bonded to the backing plate 60, the adhesive layer 111 can be placed on release paper (not shown) for protection. The reflective film strip 10 can be rolled up. In addition, a protective layer (not shown) can be provided on the metallic reflective layer 120, which can be removed before use.

[0034] The substrate 110 is made of materials such as PET polymer or EVA polymer. The adhesive layer 111 is made of materials such as EVA film or EPE film.

[0035] The first direction X specifically refers to the length direction of the reflective film strip 10. The metallic reflective layer 120 has multiple reflective areas 121 arranged along the first direction X, with a first gap 122 between adjacent reflective areas 121. That is, the metallic reflective layer 120 has multiple partitions along the first direction X, making the metallic reflective layer 120 a discontinuous reflective layer. Each partition is defined as the first gap 122. The material of the metallic reflective layer 120 is, for example, a metal material with good reflectivity such as aluminum or silver.

[0036] Optionally, the reflective area 121 is a textured structure made of metal, which is attached to the top surface of the substrate 110. Optionally, the top surface of the substrate 110 is provided with multiple textured structures, and the surface of each textured structure is provided with a metal layer, thereby forming the aforementioned multiple reflective areas 121.

[0037] like Figure 1 and Figure 3 As shown, the cell string module 40 in the photovoltaic module 100 includes multiple cell groups 410 arranged along a first direction X. Each cell group 410 includes multiple cells 411 sequentially arranged along a second direction Y intersecting the first direction X. Adjacent cells 411 in the cell group 410 are connected to each other by solder strips 412 in the second direction Y. In the first direction X, the minimum spacing between the solder strips 412 of adjacent cell groups 410 is a second gap 420. The second direction Y is generally perpendicular to the first direction X. Figure 4 As shown, multiple battery packs 410 are connected in parallel in the first direction X.

[0038] Generally, adjacent cells 411 in each battery pack 410 are interconnected by multiple solder ribbons 412. The minimum spacing between solder ribbons 412 of two adjacent battery packs 410 refers to the distance between two adjacent solder ribbons 412 in the first direction X. Or, as... Figure 3 As shown, the second gap 420 is the interval between the solder strip 412 at the very end of the first battery pack 410 and the solder strip 412 at the very beginning of the second battery pack 410.

[0039] When the reflective film strip 10 is laid onto the back panel 60, in the first direction X, each of the first gaps 122 and the second gaps 420 of the reflective film strip 10 are arranged in a one-to-one correspondence, so that the orthographic projection of the first gap 122 on the back panel 60 and the orthographic projection of the second gap 420 on the back panel 60 at least partially overlap. Thus, for reference... Figure 3 As shown, when viewed from above, at least a portion of the first gap 122 is visible below the second gap 420. It is easy to understand that when laying the reflective film strip 10, the length of the reflective film strip 10 can be cut according to the dimensions of the photovoltaic module 100 in the first direction X, ensuring that there is a corresponding first gap 122 of the reflective film strip 10 below the second gap 420.

[0040] This embodiment does not limit the structure of the solar cell 411. The types of solar cells 411 include, but are not limited to, Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), and perovskite cells. The solar cell 411 can employ a multi-busbar scheme, which can shorten the current conduction path, reduce internal losses, and thus increase the power of the photovoltaic module 100 while also reducing the cost of the photovoltaic module 100; alternatively, a busbar-less scheme can be used, replacing the original busbars with solder ribbons directly connected to the fine grid, which can significantly reduce silver paste consumption and thus reduce the cost of the photovoltaic module 100.

[0041] The reflective film strip 10 of this application has a non-continuous arrangement of the metal reflective layer 120 in the first direction X, and the first gap 122 corresponds to the second gap 420 between the solder ribbons 412 of adjacent battery packs 410. Furthermore, the orthographic projection of the first gap 122 on the backplate 60 at least partially overlaps with the orthographic projection of the second gap 420 on the backplate 60. This ensures that the metal reflective layer 120 below the second gap 420 is necessarily disconnected. Therefore, even if the two solder ribbons 412 on both sides of the second gap 420 pierce through during lamination and the encapsulating film 50 contacts the metal reflective layer 120, the metal reflective layer 120 will not cause the solder ribbons 412 of the two adjacent battery packs 410 to conduct.

[0042] In some embodiments, the length of the first gap 122 in the first direction X is 0.05 mm to 0.3 mm. Controlling the length of the first gap 122 within this range facilitates its formation using a laser or blade cutting, and also ensures that the first gap 122 remains after lamination. The length of the first gap 122 is, for example, 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0043] In some embodiments, the length of any reflective area 121 in the first direction X is less than 15.5 mm.

[0044] Generally, in the photovoltaic module 100, the length of the second gap 420 is 15.5 mm to 22 mm. Therefore, if the length of any reflective area 121 in the photovoltaic film strip is less than 15.5 mm, then when laying the reflective film strip 10, regardless of the length of the reflective area 121 extending below the first gap 122, it can be determined that the first gap 122 is located below the second gap 420, thereby ensuring that two adjacent solder strips 412 are not connected by the metal reflective layer 120.

[0045] In this way, when laying the reflective film strip 10, since it can be determined that the first gap 122 is below the second gap 420, there is no requirement for the accuracy of the position of the reflective film strip 10 in the first direction X, thereby greatly reducing the requirements of the laying process.

[0046] refer to Figures 1 to 4 Another aspect of this application proposes a photovoltaic module 100. The photovoltaic module 100 includes a cover glass 20, a front encapsulation film 30, a cell string module 40, a rear encapsulation film 50, and a backsheet 60.

[0047] The battery string module 40 includes multiple battery packs 410 arranged along a first direction X. Each battery pack 410 includes multiple battery cells 411 arranged sequentially along a second direction Y that intersects with the first direction X. Two adjacent battery cells 411 in the battery pack 410 are connected to each other by solder strips 412 in the second direction Y. In the first direction X, the minimum interval between the solder strips 412 of two adjacent battery packs 410 is a second gap 420.

[0048] A metallic reflective layer 120 is bonded to the side of the backplate 60 facing the rear encapsulating film 50. The metallic reflective layer 120 includes a plurality of reflective areas 121 arranged along a first direction X. A first gap 122 is provided between two adjacent reflective areas 121. Each first gap 122 corresponds one-to-one with each second gap 420, and the orthographic projection of the first gap 122 on the backplate 60 at least partially overlaps with the orthographic projection of the second gap 420 on the backplate 60.

[0049] In this embodiment, a metallic reflective layer 120 is obtained by bonding the reflective film strip 10 of the aforementioned embodiment to the back plate 60.

[0050] In other embodiments, the metallic reflective layer 120 may be formed by intermittent film application along the first direction X. Intermittent film application can also be understood as the first gap 122 of the reflective film strip 10 in the aforementioned embodiment breaking the metallic reflective layer 120 while also breaking the substrate 110 and the adhesive layer 111, with multiple reflective areas 121 individually bonded to the back plate 60.

[0051] As described above, since the metal reflective layer 120 is discontinuously arranged in the first direction X, and the first gap 122 corresponds to the second gap 420 between the solder ribbons 412 of adjacent battery packs 410, and the orthographic projection of the first gap 122 on the backplate 60 at least partially overlaps with the orthographic projection of the second gap 420 on the backplate 60, this ensures that the metal reflective layer 120 below the second gap 420 is necessarily disconnected. Therefore, even if the two solder ribbons 412 on both sides of the second gap 420 pierce the encapsulating film 50, the metal reflective layer 120 will not cause the solder ribbons of the two adjacent battery packs 410 to conduct. In this way, the utilization rate of light by the photovoltaic module 100 can be improved and the power generation efficiency of the photovoltaic module 100 can be guaranteed.

[0052] In some embodiments, two adjacent battery cells 411 in the battery pack 410 are connected to each other by multiple solder strips 412 in the second direction Y. The multiple solder strips 412 are arranged along the first direction X. The interval between the solder strip 412 at the tail end in the first direction X of each battery pack 410 and the solder strip 412 at the head end in the first direction X of the adjacent battery pack 410 is a second gap 420.

[0053] In the battery pack 410, two adjacent battery cells 411 are interconnected by multiple solder strips 412, enabling reliable series connection between adjacent battery cells 411. When laying the reflective film strip 10, the first gap 122 of the reflective film strip 10 should be positioned below the second gap 420 between two solder strips 412 that are close to each other in adjacent battery packs 410. In other words, there is no need to consider whether the multiple solder strips 412 in the same battery pack 410 can be connected by the metal reflective layer 120.

[0054] In some embodiments, in the first direction X, the length of the first gap 122 is less than the length of the group gap between two adjacent battery packs 410. The group gap refers to the distance between the ends of two adjacent battery packs 410 that are close to each other in the second direction Y.

[0055] By ensuring that the length of the first gap 122 is less than the length of the gap between two adjacent battery packs 410, and under the premise that the metal reflective layer 120 is discontinuously arranged in the first direction X, there is still a reflective area 121 below the gap between two adjacent battery packs 410. In this way, the utilization rate of light by the photovoltaic module 100 and the power generation efficiency of the photovoltaic module 100 can be improved while avoiding the risk of the metal reflective layer 120 causing the two adjacent battery packs 410 to conduct.

[0056] In some embodiments, the length of the first gap 122 is 0.05 mm to 0.3 mm, the length of the second gap 420 is 15.5 mm to 22 mm, and the length of the group gap is 1.5 mm to 2 mm.

[0057] like Figure 3 As shown, in the first direction X, the length of the first gap 122 is controlled within the above range, which facilitates the formation by laser or blade cutting, and also ensures that the first gap 122 still exists after lamination, avoiding the risk of the metal reflective layer 120 causing the two adjacent battery packs 410 to conduct.

[0058] In the first direction X, the length ranges of the second gap 420 and the group gap are all within the commonly used design parameter ranges of the photovoltaic module 100. Optionally, the second gap 420 is 15.5 mm, 16 mm, 18 mm, 19 mm, or 22 mm; optionally, the length of the group gap is 1.5 mm, 1.8 mm, or 2 mm.

[0059] In some embodiments, multiple metal reflective layers 120 are provided in the second direction Y, and each metal reflective layer 120 is provided in a one-to-one correspondence between the gaps between two battery cells 411.

[0060] In the second direction Y, the spacing between two solar cells 411 is defined as the cell gap. Multiple metallic reflective layers 120 are arranged along the second direction Y, correspondingly positioned below the cell gaps. In this way, light incident on the backsheet 60 through the cell gaps can be reflected by the metallic reflective layers 120 back to the solar cells 411, thereby improving the light utilization rate of the photovoltaic module 100 and ensuring the power generation efficiency of the photovoltaic module 100.

[0061] In some embodiments, such as Figure 5 As shown, the photovoltaic module 100 also includes a plurality of reflective strips 70 with continuous reflective portions on their surfaces, and each of the reflective strips 70 is provided in a one-to-one correspondence with each first gap 122.

[0062] Unlike the aforementioned reflective film strip 10, where the metal reflective layer 120 is disconnected, the reflective strip 70 has a continuous reflective surface. The reflective strip 70 corresponds to the first gap 122, meaning their orthogonal projections on the back panel 60 coincide. Multiple reflective strips 70 are arranged along a first direction X. The length direction of the reflective strip 70 is along a second direction Y. Each reflective strip 70 corresponds to a row of first gaps 122 along the second direction Y, allowing light passing through the first gaps 122 and incident on the back panel 60 to be reflected by the reflective strip 70 to the solar cell 411, thereby improving the light utilization rate of the photovoltaic module 100 and ensuring the power generation efficiency of the photovoltaic module 100.

[0063] Furthermore, the reflective strip 70 is located between the metal reflective layer 120 and the back plate 60, and the continuous reflective part is made of metal. The material of the continuous reflective part is, for example, aluminum, silver, or other materials with high reflectivity.

[0064] By positioning the reflective strip 70 between the metal reflective layer 120 and the backplate 60, the reflective strip 70 is located far from the solder ribbon 412. Therefore, even if the solder ribbon 412 pierces the encapsulation film 50, the reflective strip 70 will not conduct electricity to the solder ribbons 412 of two adjacent battery packs 410 due to the obstruction of the substrate 110 and the adhesive layer 111.

[0065] Optionally, the reflective strip 70 and the reflective film strip 10 can be prepared by similar methods and have similar structures. The difference is that the metal reflective layer 120 of the reflective film strip 10 is broken to form multiple first gaps 122, while the metal reflective layer 120 in the reflective strip 70 is not broken.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0067] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A photovoltaic module, characterized in that, This includes battery string modules, post-sealing film, and backplane, among which, The battery string module includes multiple battery packs arranged along a first direction. Each battery pack includes multiple battery cells arranged sequentially along a second direction intersecting the first direction. Two adjacent battery cells in the battery pack are connected to each other by solder strips in the second direction. In the first direction, the minimum interval between the solder strips of two adjacent battery packs is the second gap. A metallic reflective layer is bonded to the side of the backplate facing the encapsulating film. The metallic reflective layer includes a plurality of reflective areas arranged along a first direction. There is a first gap between two adjacent reflective areas. Each first gap corresponds to a second gap. The orthographic projection of the first gap on the backplate and the orthographic projection of the second gap on the backplate at least partially overlap.

2. The photovoltaic module according to claim 1, characterized in that, In the battery pack, two adjacent battery cells are connected to each other in the second direction by multiple solder strips. The multiple solder strips are arranged along the first direction. The interval between the solder strip at the tail end in the first direction of each battery pack and the solder strip at the head end in the first direction of the adjacent battery pack is the second gap.

3. The photovoltaic module according to claim 1, characterized in that, In the first direction, the length of the first gap is less than the length of the gap between two adjacent battery packs.

4. The photovoltaic module according to claim 3, characterized in that, The length of the first gap is 0.05 mm to 0.3 mm, the length of the second gap is 15.5 mm to 22 mm, and the length of the group gap is 1.5 mm to 2 mm.

5. The photovoltaic module according to claim 1, characterized in that, In the second direction, multiple metal reflective layers are provided, and each metal reflective layer is provided in a manner corresponding to the gap between two battery cells.

6. The photovoltaic module according to claim 1, characterized in that, In the first direction, the length of any one of the reflective areas is less than 15.5 mm.

7. The photovoltaic module according to claim 1, characterized in that, It also includes multiple reflective strips with continuous reflective portions on their surfaces, each of which is arranged one-to-one with each of the first gaps.

8. The photovoltaic module according to claim 7, characterized in that, The reflective strip is located between the metal reflective layer and the back plate, and the continuous reflective part is made of metal.

9. The photovoltaic module according to claim 8, characterized in that, The continuous reflective part is made of aluminum.

10. The photovoltaic module according to claim 8, characterized in that, The material of the continuous reflective part is silver.

Images