Photovoltaic module

Abstract

The utility model relates to a photovoltaic module. The photovoltaic module comprises battery strings, the multiple battery strings are connected in series and / or in parallel in the first direction, each battery string comprises multiple battery pieces connected in series in the second direction, and the first direction is perpendicular to the second direction; an insulating bonding layer is arranged between two adjacent battery strings and / or between two adjacent battery pieces in the same battery string, and the thickness D of the bonding layer is smaller than or equal to 10 micrometers. According to the photovoltaic module, two adjacent battery strings or two adjacent battery pieces in the same battery string can be insulated through the bonding layer, short circuit of the battery strings / pieces is prevented, the thickness of the bonding layer is set to be smaller than or equal to 10 micrometers, the thickness is far smaller than the existing piece spacing of 0.5 mm-2mm and the string spacing of 1.2 mm-3mm, the battery strings / pieces are arranged more tightly, and the battery strings / pieces can be arranged more tightly. The photoelectric conversion efficiency of the module can be improved, the bonding layer can fix the battery string / piece, a traditional fixing adhesive tape can be replaced, the cost of the photovoltaic module is reduced, the bonding layer can protect the battery piece, and the risks of subfissure and fragmentation of the battery piece can be reduced.

Description

Technical Field

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

[0002] In photovoltaic (PV) modules, a gap of several millimeters is typically provided between adjacent cell strings or between adjacent cells within the same cell string to prevent short circuits and other abnormalities. However, the presence of this gap reduces the light-receiving area of ​​a single PV module, lowers its photoelectric conversion efficiency, and also increases its packaging cost. Utility Model Content

[0003] Therefore, it is necessary to provide a photovoltaic module to address the aforementioned technical problems.

[0004] A photovoltaic module includes multiple battery strings connected in series and / or in parallel along a first direction, each battery string including multiple solar cells connected in series along a second direction, wherein the first direction is perpendicular to the second direction;

[0005] An insulating adhesive layer is provided between two adjacent battery strings and / or between two adjacent battery cells in the same battery string, wherein the thickness D of the adhesive layer is less than or equal to 10 μm.

[0006] In one embodiment, the thickness D of the adhesive layer is greater than or equal to 2 μm.

[0007] In one embodiment, two adjacent battery strings are spaced apart by the adhesive layer in the first direction, or spaced apart by the adhesive layer in a third direction; wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] In one embodiment, when two adjacent battery strings are stacked upwards on the third party, the spacing between the two adjacent battery strings in the first direction is less than or equal to 0.

[0009] In one embodiment, the battery cell has a front side, a back side, and a first side facing the adjacent battery string;

[0010] The adhesive layer includes a first adhesive portion, a second adhesive portion, and a third adhesive portion. The first adhesive portion is disposed on the first side surface. The second adhesive portion is opposite to the third adhesive portion and the two are located between the first adhesive portions. The second adhesive portion is disposed at the end of the front surface, and the third adhesive portion is disposed at the end of the back surface.

[0011] In one embodiment, the battery cell is a back-contact battery, and two adjacent battery cells in the same battery string are seamlessly spliced ​​together.

[0012] In one embodiment, the solar cell is a back-contact cell; the photovoltaic module further includes multiple sets of interconnecting strips, each set of interconnecting strips including multiple interconnecting strips spaced apart along the first direction, each interconnecting strip being laid from the first end to the last end of the corresponding solar cell string along the second direction, and then cut off at a corresponding position in the corresponding solar cell string so that all the solar cells in the corresponding solar cell string are connected in series.

[0013] In one embodiment, the photovoltaic module further includes a panel and a light guide structure;

[0014] At least the outer edge of the light guide structure is located on the outer periphery of the plurality of battery strings; the panel is located on the front of the plurality of battery strings and the light guide structure, and is capable of reflecting the light reflected by the light guide structure back to the corresponding battery cell.

[0015] In one embodiment, the light guide structure includes an adhesive layer, a substrate layer, and a reflective layer stacked sequentially, with the reflective layer facing the panel.

[0016] In one embodiment, the inner edge of the light guide structure is located on the back side of the plurality of battery strings; or,

[0017] The photovoltaic module also includes a back film disposed on the back of the plurality of battery strings, and the light guiding structure is disposed on the back of the back film.

[0018] The aforementioned photovoltaic module, by setting an adhesive layer between two adjacent cell strings or between two adjacent cells within the same cell string, can insulate adjacent cell strings or adjacent cells within the same cell string, preventing short circuits between cell strings / cells. Furthermore, by setting the thickness of the adhesive layer to less than or equal to 10μm, which is much smaller than the existing 0.5mm~2mm cell spacing and 1.2mm~3mm string spacing, the cell strings / cells can be arranged more compactly, improving the photoelectric conversion efficiency of the module. In addition, the adhesive layer can fix the cell strings / cells, replacing traditional fixing tape, reducing the cost of photovoltaic modules. The adhesive layer can also protect the cells, reducing the risk of microcracks and fragmentation of the cells. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a photovoltaic module as shown from the front in one embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the structure of a photovoltaic module as shown from the back in one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a half-cell battery provided in an embodiment of this application.

[0022] Figures 4 to 9 This is a schematic diagram showing the connection of two adjacent battery strings according to different embodiments of this application.

[0023] Figure 10 This is a cross-sectional view of a battery cell provided in one embodiment of this application.

[0024] Figure 11 for Figure 2 A partial schematic diagram of the provided photovoltaic module.

[0025] Figure 12 This is a schematic diagram of the structure of a photovoltaic module from the back, as shown in another embodiment of this application.

[0026] Figure 13 This is a schematic diagram of the end structure of a photovoltaic module as seen from the back, according to another embodiment of this application.

[0027] Figure 14 This is an exploded view of a photovoltaic module provided in another embodiment of this application.

[0028] Figure 15 for Figure 14 The provided light guide structure and the structural diagram of multiple battery strings are shown.

[0029] Figure 16 For light in Figure 14 A schematic diagram of propagation in the provided photovoltaic module.

[0030] The labels in the attached diagram are explained as follows:

[0031] 10. Photovoltaic module; 100. Cell string; 110. Cell; 200. Adhesive layer; 210. First adhesive part; 220. Second adhesive part; 230. Third adhesive part; 120. Interconnect strip; Q. Area to be cut; 130. Busbar; 140. Adhesive film; 300. Panel; 400. Light guide structure; 500. Backsheet; 600. Front adhesive film; 700. Back adhesive film. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Photovoltaic modules, as the core component of a solar power generation system, are typically composed of multiple cell strings connected in series and parallel. Each cell string includes multiple cells connected in series. To prevent short circuits between cells and / or cells, a string spacing of 1.2mm to 3mm is usually provided between adjacent cells, and a cell spacing of 0.5mm to 2mm is provided between adjacent cells within the same cell string. However, the presence of string and cell spacing reduces the light-receiving area of ​​a single photovoltaic module, lowers the photoelectric conversion efficiency, and also increases the packaging cost of the photovoltaic module.

[0039] In this regard, one embodiment of this application provides a photovoltaic module 10, such as... Figure 1 and Figure 2 As shown, the photovoltaic module 10 may include multiple cell strings 100, which are connected in series and / or in parallel along a first direction. Each cell string 100 includes multiple solar cells 110 connected in series along a second direction, wherein the first direction is perpendicular to the second direction. Throughout this text, "first direction" refers to... Figure 1 The direction of the "X-axis" shown in the diagram is used as a reference, and the "second direction" is based on... Figure 1 The direction of the "Y-axis" shown in the figure is the reference.

[0040] The output voltage of the photovoltaic module 10 is mainly related to the connection method and number of the battery strings 100 and the number of battery cells set in each battery string 100. The multiple battery strings 100 can be connected in series, in parallel, or in a mixed series-parallel connection. The number of battery strings 100 can be set to 2, 3, 4, 5 or more. The number of battery cells 110 in each battery string 100 can be set to 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or more.

[0041] The solar cell 110, as the smallest unit of the photovoltaic module 10, can be a TOPCon (Tunnel Oxide Passivated Contact) cell, a BC (Back Contact) cell, an HJT (Heterojunction with Intrinsic Thin layer) cell, or other cells.

[0042] Among them, the solar cell 110 can be a conventional complete solar cell or Figure 3 The diagram shows a half-cell solar cell (i.e., half of a complete solar cell). Compared to a complete solar cell, the current drawn by a half-cell is only half that of a complete solar cell. In a series circuit, according to the power loss formula P=I... 2 ×R (P is power loss, I is current, and R is resistance), a decrease in current leads to a significant reduction in heat loss. This helps reduce the heat generated by the solar cell 110 during operation and improves the power generation efficiency of the module.

[0043] like Figure 4 As shown, an insulating adhesive layer 200 is provided between two adjacent battery strings 100 and / or between two adjacent battery cells 110 within the same battery string 100. The thickness D of the adhesive layer 200 is less than or equal to 10 μm. The insulating adhesive layer 200 prevents contact between two adjacent battery strings 100 or two adjacent battery cells 110 within the same battery string 100, thus preventing short circuits between battery strings / cells. Since the thickness of the adhesive layer 200 is no greater than 10 μm, the maximum spacing between battery strings / cells is only 20 μm, which is much smaller than the existing 0.5 mm to 2 mm cell spacing and 1.2 mm to 3 mm string spacing, allowing for a more compact arrangement of battery strings / cells and improving the photoelectric conversion efficiency of the module. In addition, the adhesive layer 200 can also fix the battery strings / cells, replacing traditional fixing tape and reducing the cost of the photovoltaic module 10. Furthermore, the adhesive layer 200 can also protect the battery cells 110, reducing the risk of microcracks and fragmentation of the battery cells 110.

[0044] The thickness D of the adhesive layer 200 is greater than or equal to 2μm, for example, it can be set to 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, etc. This setting can reduce the processing difficulty of the photovoltaic module 10.

[0045] The adhesive layer 200 can be made of insulating materials such as EVA (Ethylene Vinyl Acetate Copolymer), POE (Polyolefin Elastomer), or silicone. It can be applied between battery strings / cells by printing or coating and can be cured by heating or UV (Ultraviolet) irradiation. The adhesive layer 200 can be green, white, transparent, black, etc., and can be selected according to the application requirements of the module.

[0046] Of course, in some other embodiments, the adhesive layer 200 may also be an insulating film such as a PET film, fluorine film, or rubber film with adhesive coating on its surface.

[0047] As can be seen, the photovoltaic module 10 provided in this application, by providing an adhesive layer 200 between two adjacent cell strings 100 or between two adjacent cells 110 within the same cell string 100, can insulate the two adjacent cell strings 100 or the two adjacent cells 110 within the same cell string 100, preventing short circuits between cell strings / cells. Furthermore, by setting the thickness of the adhesive layer 200 to less than or equal to 10μm, which is much smaller than the existing 0.5mm~2mm cell spacing and 1.2mm~3mm string spacing, the cell strings / cells can be arranged more compactly, improving the photoelectric conversion efficiency of the module. Moreover, the adhesive layer 200 can fix the cell strings / cells, replacing traditional fixing tape and reducing the cost of the photovoltaic module 10. The adhesive layer 200 can also protect the cells 110, reducing the risk of microcracks and fragmentation of the cells 110.

[0048] In some embodiments of this application, such as Figure 4 and Figure 5 As shown, two adjacent battery strings 100 can be spliced ​​together in the first direction, meaning that two adjacent battery strings 100 are spaced apart by an adhesive layer 200 in the first direction. For two adjacent battery strings 100, only one battery string 100 may have an adhesive layer 200, making the spacing between the two adjacent battery strings 100 in the first direction equal to the thickness of one adhesive layer 200; alternatively, both battery strings 100 may have adhesive layers 200, making the spacing between the two adjacent battery strings 100 in the first direction equal to the thickness of two adhesive layers 200. Splicing two adjacent battery strings 100 in a planar manner in the first direction can reduce the processing difficulty of the photovoltaic module 10.

[0049] Of course, in some other embodiments, such as Figures 6 to 9As shown, two adjacent battery strings 100 can be stacked in the third direction, that is, two adjacent battery strings 100 are separated by an adhesive layer 200 in the third direction, wherein the first direction and the second direction are perpendicular to each other in the third direction. Stacking two adjacent battery strings 100 in the third direction makes the spacing between the two adjacent battery strings 100 in the first direction less than the thickness of the adhesive layer 200, so that the battery strings 100 are arranged more closely.

[0050] When two adjacent battery strings 100 are stacked upwards in a third direction, the spacing between the two adjacent battery strings 100 in the first direction is less than or equal to 0. This arrangement of adjacent battery strings 100 completely eliminates the string spacing of the photovoltaic module 10 in the first direction. Optionally, the spacing between two adjacent battery strings 100 in the first direction can be from -5mm to -0.1mm (e.g., -5mm, -4mm, -3mm, -2mm, -1mm, -0.1mm, etc.), meaning the stacking width of two adjacent battery strings 100 in the first direction is from 0.1mm to 5mm.

[0051] The spacing between two adjacent battery strings 100 in the third direction can be the thickness of one adhesive layer 200 or the thickness of two adhesive layers 200. This is mainly related to the spacing between two adjacent battery strings 100 in the first direction. If the spacing between two adjacent battery strings 100 in the first direction is 0, the spacing between two adjacent battery strings 100 in the third direction can be... Figure 6 The thickness of the two adhesive layers shown is 200, which can also be... Figure 7 The thickness of the adhesive layer 200 shown; if the spacing between two adjacent battery strings 100 in the first direction is large, for example -0.1mm, the spacing between two adjacent battery strings 100 in the third direction can be Figure 8 The thickness of the adhesive layer shown is 200, which can also be... Figure 9 The thickness of the adhesive layer shown is 200.

[0052] Optionally, the battery cell 110 is a BC battery cell, and the positive and negative electrodes of the battery cell are both provided on the back side of the battery cell 110. Even if two adjacent battery strings 100 have a height difference in the third direction, when the battery strings 100 are laminated along the third direction, the risk of microcracks in the BC battery cell 110 is much lower than that of other types of battery cells 110.

[0053] In some embodiments of this application, such as Figure 10As shown, the battery cell 110 has a front side, a back side, and a first side facing the adjacent battery string 100; the adhesive layer 200 includes a first adhesive portion 210, a second adhesive portion 220, and a third adhesive portion 230. The first adhesive portion 210 is disposed on the first side, the second adhesive portion 220 and the third adhesive portion 230 are opposite each other and are located between the first adhesive portion 210, the second adhesive portion 220 is disposed at the end of the front side, and the third adhesive portion 230 is disposed at the end of the back side. The adhesive layer 200 is designed in a C-shape to facilitate the bonding and fixing of battery strings / cells. When two adjacent battery strings 100 are spliced ​​together in the first direction, the first adhesive portion 210 of the adhesive layer 200 can fix the two adjacent battery strings 100. The second adhesive portion 220 and the third adhesive portion 230 of the adhesive layer 200 can prevent the adhesive layer 200 from peeling off from the battery cell 110 when the battery strings 100 are laminated. When two adjacent battery strings 100 are stacked in the third direction, the second adhesive portion 220 or the third adhesive portion 230 of the adhesive layer 200 can bond the two adjacent battery strings 100 together.

[0054] In some embodiments of this application, the solar cell 110 is a back-contact cell, and two adjacent solar cells 110 in the same cell string 100 are seamlessly spliced. The electrodes of the back-contact cell are on the back side, and there are no grid lines (i.e., interconnecting strips 120 below) on the front side, which allows for seamless splicing of the solar cells 110 on the front side without causing short circuits and maximizing the utilization of the light-receiving area. Furthermore, during the processing of the photovoltaic module 10, a passivation layer is usually provided on the surface of the solar cells 110. The passivation layer can prevent short circuits between solar cells 110. In addition, the current of the solar cells 110 is not large, and short circuits are not likely to occur. The potential difference in the non-grid area of ​​the solar cells 110 is not large, and there is an insulating film 140 after lamination, which reduces the risk of short circuits.

[0055] Of course, in some other embodiments, the adhesive layer 200 between two adjacent battery cells 110 in the same battery string 100 can also be set in the same way as the adhesive layer 200 between adjacent battery strings 100.

[0056] The back of the back-contact battery has multiple positive and multiple negative electrode regions, which are staggered along a first direction. Interconnecting strips 120 for collecting electrons are provided between the positive and negative electrode regions. Figure 2 and Figure 11As shown, in some embodiments of this application, the photovoltaic module 10 further includes multiple sets of interconnecting strips 120. Each set of interconnecting strips 120 includes multiple interconnecting strips 120 spaced apart along a first direction. Each interconnecting strip 120 can be cut at a corresponding position in the corresponding battery string 100 after being laid from the first segment to the last segment along a second direction, so that all the battery cells 110 in the corresponding battery string 100 are connected in series. Compared with the existing method of first cutting a complete interconnecting strip into multiple segments and then connecting the multiple segments between two adjacent battery cells 110, the way the interconnecting strips 120 are arranged on the battery string 100 in this application can speed up the production cycle of the photovoltaic module 10, and the production cycle of a single photovoltaic module 10 can be saved by 1 minute.

[0057] During the processing of photovoltaic module 10, after the solar cells 110 are arranged, the traction mechanism pulls the interconnecting strip 120 from the first end to the last end of the corresponding solar string 100 in the second direction. It is then fixed by a mesh pressing or by adhesive application, and the solar string 100 is welded using infrared heating or laser heating. After the solar string 100 is welded, an external mechanism cuts off any unnecessary connections between the solar cells 110, such as... Figure 11 As shown, the area within the dashed line is the region Q to be cut off. Within the region Q to be cut off, based on the characteristic of the alternating distribution of positive and negative electrode regions, every other interconnection strip 120 can be cut off.

[0058] The number of interconnecting strips 120 in each group can be determined by the number of main busbars in the solar cell 110. If the number of main busbars in the solar cell 110 is set to 20, the traction mechanism will pull 120 interconnecting strips 120 through all the solar cells 110 at a time, placing the interconnecting strips 120 in the corresponding positions. The number of main busbars in the solar cell 110 is typically set to 10 to 50, and existing traction mechanisms can handle 60 to 300 interconnecting strips 120. The arrangement of these interconnecting strips 120 on the battery string 100 is compatible with conventional cells with or without main busbars, and is compatible with back-contact cells of all technical routes, including TBC cells, HBC cells, or copper interconnect cells, etc.

[0059] In some embodiments of this application, Figure 12 and Figure 13 As shown, the photovoltaic module 10 also includes a busbar 130, which is disposed on the back of multiple cell strings 100, and the multiple cell strings 100 are connected through the busbar 130. The busbar 130 facilitates the multiple cell strings 100 to be connected in series, in parallel, or in a mixed series-parallel connection. Compared with the existing method where the busbar 130 is disposed on the outside of multiple cell strings 100, this application, by disposing of the busbar 130 on the back of multiple cell strings 100, can effectively increase the light-receiving area of ​​the cell 110, achieving the effect of the photovoltaic module 10 covering the cell 110 except for the edge creepage distance.

[0060] As shown Figure 13 in the figure, the bus bar 130 can be arranged at the end of the battery string 100 along the second direction, or as shown Figure 12 in the figure, the bus bar 130 is arranged in the middle of the battery string 100. In order to prevent the battery chips 110 from being cracked invisibly during the lamination of the photovoltaic module 10, as shown Figure 12 and Figure 13 in the figure, a glue film 140 is filled between the bus bar 130 and the battery chips 110. During lamination, the glue film 140 can fill the gap between the bus bar 130 and the battery chips 110 to prevent the battery chips 110 from being cracked invisibly during lamination. Among them, the glue film 140 can be strip-shaped, and the glue film 140 can be arranged Figure 12 on both sides of the bus bar 130 as shown Figure 13 in the figure, or can be arranged inside the bus bar 130 as shown

[0061] In some embodiments of the present application, as shown Figure 14 in the figure, the photovoltaic module 10 further includes a panel 300 and a light guiding structure 400; as shown Figure 15 in the figure, at least the outer edge of the light guiding structure 400 is arranged on the outer periphery of a plurality of battery strings 100; the panel 300 is arranged on the front of a plurality of battery strings 100 and the light guiding structure 400, and can reflect the light reflected by the light guiding structure 400 to the corresponding battery chips 110 again. Arranging the battery strings / chips more closely and moving the bus bar 130 from the outside of the battery string 100 to the back of the battery string 100 enables the edge position of the photovoltaic module 10 to accommodate the light guiding structure 400. The light guiding structure 400 has a directional light guiding function, can direct the light in the creepage blank area to the surface of the battery chips 110, and can realize the full utilization of the edge light, achieving the best effect of ultra-high density packaging. Figure 16 Figure shows the propagation schematic diagram of light in the photovoltaic module 10. The front incident light travels along the light guiding path to the surface of the directional light guiding structure 400. The light guiding structure 400 then reflects the light to the back of the panel 300, and then the light is reflected from the back of the panel 300 to the front of the battery chips 110 and is absorbed for power generation. It should be noted that Figure 16 the arrows in the figure represent the propagation direction of the light.

[0062] Among them, the panel 300 can be a glass panel 300. As shown Figure 14 in the figure, the photovoltaic module 10 further includes a front glue film 600, and the front glue film 600 is arranged between the front of a plurality of battery strings 100 and the back of the panel 300. When arranging the battery chips 110, first set the front glue film 600 on the back of the glass panel 300, and then lay the battery chips 110 on the back of the front glue film 600.

[0063] Optionally, the light guiding structure 400 is in a "return" shape. The light guiding structure 400 with this structure can fully reflect the light in the creepage blank area.

[0064] Optionally, the light guide structure 400 includes an adhesive layer, a substrate layer, and a reflective layer stacked sequentially, with the reflective layer facing the panel 300. The adhesive layer may be made of the same material as or a different material than the adhesive layer 200; for example, it may be made of acrylic adhesive. The substrate layer is mainly used to support the reflective layer, and its material may be PET (polyethylene glycol terephthalate). This application does not impose specific limitations on the material of the substrate layer. The reflective layer may be an aluminum reflective layer, which has a high reflectivity, up to 98%.

[0065] Optionally, the inner edge of the light guide structure 400 can be located on the back of the plurality of battery strings 100, that is, the adhesive layer of the light guide structure 400 is connected to the back of the battery cell 110. In this way, only the outer edge of the light guide structure 400 is located on the outer periphery of the plurality of battery strings 100 for guiding light. After the busbar 130 is installed on the back of the plurality of battery strings 100, a ring of light guide structure 400 is first set on the back edge of the plurality of battery strings 100, then a back adhesive film 700 is laid on the back of the light guide structure 400 and the plurality of battery strings 100, and then a back sheet 500 is laid to complete the module stacking, and the photovoltaic module 10 is formed by lamination and framing.

[0066] Of course, in some other embodiments, such as Figure 14 As shown, the photovoltaic module 10 also includes a back film 700 disposed on the back of the plurality of cell strings 100 and a back sheet 500 disposed on the back of the back film 700. The light guide structure 400 is disposed on the back of the back film 700 and located between the back sheet 500 and the back film 700. In this configuration, the light guide structure 400 is entirely disposed on the outer periphery of the plurality of cell strings 100.

[0067] The backsheet 500 can be a glass backsheet, meaning the photovoltaic module 10 is a double-glass module; of course, the backsheet 500 can also be a non-transparent backsheet, meaning the photovoltaic module 10 is a single-glass module.

[0068] 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.

[0069] The embodiments described above are merely illustrative of 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 by, The photovoltaic module comprises a plurality of battery strings, the plurality of battery strings are connected in series and / or parallel along a first direction, each of the battery strings comprises a plurality of battery pieces connected in series along a second direction, wherein the first direction is perpendicular to the second direction; An insulating adhesive layer is arranged between two adjacent battery strings and / or between two adjacent battery pieces in the same battery string, and the thickness D of the adhesive layer is less than or equal to 10 microns.

2. The photovoltaic module of claim 1, wherein, The thickness D of the adhesive layer is greater than or equal to 2 microns.

3. The photovoltaic module of claim 1, wherein, The two adjacent battery strings are spaced apart in the first direction by the adhesive layer, or are spaced apart in a third direction by the adhesive layer; wherein the first direction, the second direction and the third direction are perpendicular to each other.

4. The photovoltaic module of claim 3, wherein, When the two adjacent battery strings are stacked in the third direction, the spacing between the two adjacent battery strings in the first direction is less than or equal to 0.

5. The photovoltaic module of claim 3, wherein, The battery piece has opposite front and back surfaces and a first side surface facing the adjacent battery string; The adhesive layer comprises a first adhesive part, a second adhesive part and a third adhesive part, the first adhesive part is arranged on the first side surface, the second adhesive part and the third adhesive part are opposite to each other and are located between the first adhesive part, the second adhesive part is arranged on the end of the front surface, and the third adhesive part is arranged on the end of the back surface.

6. The photovoltaic module of claim 1, wherein, The battery piece is a back contact battery, and the two adjacent battery pieces in the same battery string are seamlessly spliced.

7. The photovoltaic module according to any of claims 1 to 6, characterized in that The battery piece is a back contact battery; the photovoltaic module further comprises a plurality of interconnection strips, each of the plurality of interconnection strips comprises a plurality of interconnection strips arranged at intervals along the first direction, and each of the plurality of interconnection strips can be laid from the head to the tail of the corresponding battery string along the second direction, and then cut at the corresponding position in the corresponding battery string to make all the battery pieces in the corresponding battery string connected in series.

8. The photovoltaic module according to any of claims 1 to 6, characterized in that The photovoltaic module further comprises a panel and a light guide structure; At least the outer edge of the light guide structure is arranged on the outer periphery of the plurality of battery strings; the panel is arranged on the front surface of the plurality of battery strings and the light guide structure, and can reflect the light reflected by the light guide structure again to the corresponding battery piece.

9. The photovoltaic module of claim 8, wherein, The light guide structure comprises an adhesive layer, a substrate layer and a reflective layer arranged in sequence, and the reflective layer faces the panel.

10. The photovoltaic module of claim 8, wherein, The inner edge of the light guide structure is arranged on the back surface of the plurality of battery strings; or, The photovoltaic module further comprises a back surface adhesive film arranged on the back surface of the plurality of battery strings, and the light guide structure is arranged on the back surface of the back surface adhesive film.

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