A super densely arranged photovoltaic module

Abstract

The present application provides an ultra-densely arranged photovoltaic module, the photovoltaic module comprising: a battery string, which is composed of battery cells connected in series, the battery cells are connected by interconnection bars, and the spacing between the battery cells ranges from greater than 1.5 mm to less than or equal to 0.5 mm; the battery strings are connected in parallel by inter-string interconnection bars, and the spacing between the battery strings ranges from greater than or equal to 0.2 mm to less than or equal to 1.5 mm; the battery strings are connected by bus bars to form a battery string group. By using the various embodiments in the present application, the power generation efficiency of the photovoltaic module can be improved, and the efficiency and stability of the power generation of the photovoltaic module can be ensured.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to an ultra-densely arranged photovoltaic module. Background Art

[0002] As energy becomes increasingly scarce, photovoltaic technology, as a technology that can directly convert solar energy into electrical energy, has been widely used. The structural design of photovoltaic modules directly affects the power generation efficiency of photovoltaic modules.

[0003] In the prior art, the gaps between the cells in the photovoltaic modules are large, resulting in low space utilization of the modules, which in turn leads to low power generation efficiency per unit area. In addition, the cells in the existing photovoltaic modules are welded as a whole, and the current of the cells is large, resulting in large internal friction of the modules and low power generation efficiency. In addition, the internal circuit structure of the existing modules is mostly a series structure composed of multiple cells. When a cell operates abnormally (for example, it is blocked by foreign objects such as leaves or bird droppings), the power generation efficiency of the entire module is reduced, resulting in a large waste of resources.

[0004] There are at least the following problems in the prior art: the existing photovoltaic modules have large gaps in the arrangement of the cells, resulting in low space utilization of the modules; the cells are welded as a whole, the current of the cells is large, resulting in large internal friction in the modules; the internal circuit structure of the existing modules is mostly a series structure composed of multiple cells; when a cell operates abnormally (for example, blocked by foreign objects such as leaves or bird droppings), the power generation efficiency of the entire module is reduced. All these lead to the low power generation efficiency of the existing photovoltaic modules. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a super-dense arrangement of photovoltaic modules to improve the power generation efficiency of the photovoltaic modules and ensure the high efficiency and stability of the power generation of the photovoltaic modules.

[0006] The embodiment of the present application provides a super-dense arrangement of photovoltaic modules, which is achieved as follows:

[0007] An ultra-densely arranged photovoltaic module, comprising:

[0008] A battery string is composed of battery cells connected in series, wherein the battery cells are connected by interconnection bars, and the spacing between the battery cells ranges from greater than -1.5 mm to less than or equal to 0.5 mm;

[0009] The battery strings are connected in parallel using inter-string interconnection bars, and the spacing between the battery strings is in the range of greater than or equal to 0.2 mm and less than or equal to 1.5 mm;

[0010] The battery strings are connected via bus bars to form a battery string group.

[0011] In a preferred embodiment, the battery cell is obtained by slicing a conventional battery cell, and the busbar width of the battery cell has a value range of greater than or equal to 0.1 mm and less than or equal to 1.1 mm.

[0012] In a preferred embodiment, the photovoltaic module further comprises a laminate, and an insulating sealing material is arranged around the inside of the laminate.

[0013] In a preferred embodiment, an insulating material is provided on the busbar of the photovoltaic module.

[0014] In a preferred embodiment, an aluminum frame is provided at the outer edge of the laminate, and the aluminum frame surrounds the laminate.

[0015] In a preferred embodiment, the distance from the bus bar to the edge of the glass panel is in the range of greater than or equal to 6 mm and less than or equal to 13 mm.

[0016] In a preferred embodiment, the distance from the battery cell to the edge of the glass panel is in the range of greater than 5 mm and less than 17.5 mm.

[0017] By using an ultra-densely arranged photovoltaic module provided by an embodiment of the present application, the blank area of ​​the cell arrangement can be effectively reduced by reducing the distance between the cells and the spacing between the cell strings, thereby increasing the power generation efficiency per unit area of ​​the photovoltaic module. The cell strings are connected in parallel through the inter-string interconnection strips, so that if one cell is abnormal, the current of other cells in the cell string to which the cell string belongs can be transmitted to another cell string through the inter-string interconnection strips, which will not affect the photovoltaic module as a whole, effectively improving the stability of the photovoltaic module power generation, and thus effectively improving the power generation efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] FIG. 1( a ) is a schematic diagram of a connection structure of ultra-densely arranged photovoltaic modules provided in one embodiment of the present application;

[0020] FIG. 1( b ) is a schematic cross-sectional view of the connection structure shown in FIG. 1( a );

[0021] Figure 2 This is a schematic diagram of the distance relationship of ultra-densely arranged photovoltaic modules provided by an embodiment of the present application;

[0022] Figure 3This is a structural comparison diagram of a split battery cell provided by an embodiment of the present application and an existing battery cell;

[0023] Figure 4 This is a schematic diagram of a connection structure of ultra-densely arranged photovoltaic modules provided by another embodiment of the present application;

[0024] Figure 5 is with Figure 4 A schematic cross-sectional view of the connection structure;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of an ultra-densely arranged photovoltaic module provided in an example of the present application;

[0026] Figure 7 is a schematic cross-sectional structure diagram of an ultra-densely arranged photovoltaic module provided in another example of the present application;

[0027] Figure 8 is a schematic cross-sectional structure diagram of an ultra-densely arranged photovoltaic module provided in another example of the present application;

[0028] Fig. 9 This is a general structural diagram of an ultra-densely arranged photovoltaic module provided in an application example of the present application;

[0029] Fig.10 This is a general structural diagram of an ultra-densely arranged photovoltaic module provided in another application example of the present application;

[0030] Fig.11 This is an overall structural diagram of an ultra-densely arranged photovoltaic module provided in another application example of the present application.

[0031] The figure marks of the above drawings are: 1. battery cell; 2. interconnection bar between strings; 21. interconnection bar; 3. bus bar; 4. insulating sealing material; 41. insulating isolation material; 5. aluminum frame; 6. EVA or POE packaging material; 7. silicone adhesive or tape; 8. photovoltaic glass. DETAILED DESCRIPTION

[0032] An embodiment of the present application provides an ultra-densely packed photovoltaic module.

[0033] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0034] FIG1( a ) is a schematic diagram of a connection structure of ultra-densely arranged photovoltaic modules provided in one embodiment of the present application.

[0035] Specifically, as shown in FIG. 1( a ), an embodiment of an ultra-densely arranged photovoltaic assembly provided by the present application may include:

[0036] A battery string is composed of battery cells 1 connected in series, wherein the battery cells 1 are connected by interconnection bars, and the spacing between the battery cells 1 is greater than -1.5 mm and less than or equal to 0.5 mm;

[0037] The battery strings are connected in parallel using an inter-string interconnection bar 2, and the spacing between the battery strings is greater than or equal to 0.2 mm and less than or equal to 1.5 mm;

[0038] The battery strings are connected via bus bars 3 to form a battery string group.

[0039] FIG1(b) is a schematic cross-sectional view of the connection structure described in FIG1(a). As shown in FIG1(b), the battery cells 1 are connected by interconnecting bars 21, and the battery strings are connected by bus bars 3, and the bus bars 3 are covered with insulating isolation materials 41. In FIG1(b), the shape, thickness, etc. of the insulating isolation material 41 are exemplary. In actual implementation, the shape, thickness, material, etc. of the insulating isolation material 41 are not limited in this application. For example, in one embodiment of the present application, the insulating isolation material may be insulating paint, in another embodiment of the present application, the insulating isolation material may be insulating tape, and in other embodiments of the present application, the insulating isolation material may also be insulating materials of other shapes, thicknesses, and materials. Implementers may select the insulating isolation material according to actual needs and conditions.

[0040] Figure 2 FIG. 1 is a schematic diagram of the distance relationship of ultra-densely arranged photovoltaic modules provided by an embodiment of the present application, such as Figure 2 In the embodiment, the value range of the battery string spacing H is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, and the value range of the spacing G between battery cells is greater than -1.5 mm and less than or equal to 0.5 mm. The blank area of ​​the component is effectively reduced.

[0041] Figure 3 is a structural diagram of a split battery cell provided by an embodiment of the present application, such as Figure 3 As shown in , the sliced ​​cell is obtained by slicing an existing conventional cell, and the value range of the main grid line width A of the cell is greater than or equal to 0.1 mm and less than or equal to 1.1 mm.

[0042] Figure 4 is a schematic diagram of a connection structure of ultra-densely arranged photovoltaic modules provided by another embodiment of the present application. Figure 5 yes Figure 4 The cross-sectional structure diagram corresponding to the connection structure is shown below. Figure 4 , Figure 5 As shown, in this example, the cells 1 are connected by interconnection bars 21. The photovoltaic module also includes a laminate, and an insulating sealing material 4 is arranged around the inside of the laminate. An aluminum frame 5 is arranged on the outer edge of the laminate, and the aluminum frame 5 surrounds the laminate. Figure 5 As shown, in this example, an insulating isolation material 41 is provided on the busbar of the photovoltaic module, and the insulating isolation material 41 is provided between the EVA or POE packaging material 6 and the busbar 4 .

[0043] The insulating isolation material may be insulating tape, insulating backboard, insulating glue, insulating paint or other related insulating isolation materials.

[0044] Figure 6 FIG. 1 is a schematic diagram of a cross-sectional structure of an ultra-densely arranged photovoltaic module provided in an example of the present application. Figure 6 As shown, the frame is an aluminum frame 5, which is arranged around the laminate to surround the laminate and is clamped on the photovoltaic glass 8 of the photovoltaic module. A silicone adhesive or tape 7 is arranged between the aluminum frame 5 and the photovoltaic glass 8.

[0045] Figure 7 FIG. 1 is a schematic cross-sectional structure diagram of an ultra-densely arranged photovoltaic module provided in another example of the present application. Figure 7 As shown, in this example, the aluminum frame 5 is configured as an ultra-thin and ultra-narrow aluminum frame.

[0046] Figure 8 is a schematic cross-sectional structure diagram of an ultra-densely arranged photovoltaic module provided in another example of the present application, such as Figure 8 As shown, it can be Figure 7 The upper part of the corresponding ultra-thin or conventional frame is removed to reduce dust accumulation and shadowing, and insulating materials such as butyl adhesive are added around the laminate to shorten the distance from the battery cell to the edge of the glass.

[0047] Fig. 9 It is a general structural diagram of an ultra-densely arranged photovoltaic module provided in an application example of the present application, corresponding to the structure of a photovoltaic module using sliced ​​cells.

[0048] Fig.10 It is a general structural diagram of an ultra-densely arranged photovoltaic module provided in another application example of the present application, which corresponds to the structure of a photovoltaic module using laminated cells.

[0049] Fig.11This is a general structural diagram of an ultra-densely arranged photovoltaic module provided in another application example of the present application, which corresponds to the structure of the MWT battery module.

[0050] In one embodiment of the present application, the distance from the bus bar to the edge of the glass panel is in the range of greater than or equal to 6 mm and less than or equal to 13 mm.

[0051] In one embodiment of the present application, the distance from the battery cell to the edge of the glass panel ranges from greater than 13 mm to less than 17.5 mm.

[0052] By utilizing the implementation methods of the ultra-densely packed photovoltaic modules described in the above-mentioned embodiments or examples, in order to solve the problem of large current in the whole cell, a new module design adopts segmented cells, that is, conventional cells are cut into pieces. The number of equal parts of the cell is not limited, ranging from 1 / 2 to 1 / 12. Preferably, the cell is cut into 1 / 3 or 1 / 4. The segmented cell can effectively reduce the current between the cells of the photovoltaic module, reduce the internal consumption of the photovoltaic module by a square factor, and thus effectively improve the power generation efficiency of the photovoltaic module.

[0053] To address the problem of cell spacing, the photovoltaic module described in this application uses segmented cells with a main grid line of 0.1~1.1mm, and the corresponding interconnection bars are 0.5~1.2mm wide and 0.12~0.25mm thick. As the width and thickness of the interconnection bars become smaller, the interconnection bars also become softer. The spacing between the cells of this application is -1.5~0.5mm, which can effectively reduce the spacing between the cells, reduce the blank area of ​​the photovoltaic module, and effectively improve the power generation efficiency of the photovoltaic module.

[0054] For abnormal situations of battery cells such as local bird droppings and leaves blocking, it can be solved by using multiple battery strings in parallel, and the battery cells of the battery strings are interconnected through the inter-string interconnection strips. For example, when a battery cell is blocked, the current of the remaining battery cells in this string can be transmitted to another battery string through the inter-string interconnection strips to continue to be transmitted, thus reducing the impact of hot spots. To achieve this lateral interconnection design, the solution of using interconnection to shunt the current sideways requires series and parallel connection first, and the dicing process itself can meet the realization very well. The inter-string interconnection strips can be interconnection strips, or conductive tapes, or transparent conductive film materials, etc., and the lateral interconnection process is performed on the back or front of the battery cell. Opaque conductive materials can only be interconnected on the back to avoid the influence of their own occlusion. This can affect the design of 2 strings, 3 strings or multiple strings in parallel. It can be applied to battery cell assemblies such as masterless coral process and welding belt process, and can also be applied to interconnection strip type stacking assembly process. The number of the inter-string interconnection strips is not limited, and it can be designed so that each battery cell in the same row is connected in parallel, or it can be designed so that every 2 to 6 battery cells in the same row are connected in parallel.

[0055] The following is a summary of the beneficial effects of the present application in combination with the embodiments described in the present application. Specifically, the beneficial effects of the present application mainly include: 1. The photovoltaic panel design adopts a slicing process, and the conventional cell is sliced ​​into equal parts and then welded. The main grid line of the cell is also redesigned, and an ultra-soft welding strip is used. The photovoltaic panel design adopts a multi-string parallel structural design, or a process called a plate design, which forms multiple strings of cells into plates connected in parallel with each other, and is physically fixed by welding strip materials to achieve completely rigid and precise positioning. It is no longer subject to the strength of vacuuming, and there is no need to worry about the displacement between the cell strings caused by vacuuming, because the plate has no traditional independent single cell string. This plate design can be realized in the conventional cell process of ultra-soft welding strip after slicing, and welded and fixed on the back; it can also be realized in the process of shingled photovoltaic panels, and the process of welding multiple pieces in parallel at the same time is realized by welding strips; it can also be applied to the cell process of MWT, and the process of welding multiple pieces in parallel at the back. 2. The conventional cell gap problem in the cell string of the photovoltaic panel design is also well solved in the new design. After the conventional cell is newly designed with grid lines, the cells can be arranged directly at any spacing by using scribe and ultra-soft solder strips, from overlapping to normal spacing; the solder strips used for the shingling process are completely zero gap; after the cell is scribed by the MWT process, the edges of the cell need to be insulated and then closely arranged without the risk of circuit short circuit, and very small gaps between cells can be achieved. 3. In order to optimize the creepage distance around the internal circuit of the photovoltaic panel, new insulating materials and process methods are introduced to insulate the conductors such as busbars, such as insulating edging materials, insulating glue or insulating paint. Similarly, narrow high-insulation materials can be added around the periphery for built-in edge sealing, which can reduce the requirements for creepage distance and also protect and block the surrounding parts, including moisture cracking prevention. 4. In view of the obstruction factor on the front of the frame of the photovoltaic panel, the frame structure is redesigned, and a high-bonding strength structural silicone material is introduced to achieve high-strength structural bonding on the back, so that the obstruction part of the frame can be removed in the design, and the design of the photovoltaic panel can be further compacted, not restricted by the physical obstruction on the front of the frame.

[0056] Regarding the problem of cell string spacing, since the photovoltaic module described in this application adds interconnection strips between strings and fixes the distance between strings, there will be no relative displacement due to the flow of EVA during the lamination process and the suction on the cell strings during the vacuum process. Therefore, this design reduces the cell string spacing. Preferably, the design size is 0.2mm~1.5mm, which can effectively improve the stability of the photovoltaic module.

[0057] In order to achieve the creepage distance required by IEC, in this application, a circle of insulating glue or insulating tape with a width of 2~10mm can be added around the back panel or the inside of the back glass. The insulating glue or insulating tape can be made of butyl rubber, resin material, silicone, foam glue, etc. A circle of insulating tape can also be attached to the bus bar or a layer of insulating isolation material can be wrapped around it. The insulating isolation material can be attached to the bus bar to prevent the insulating isolation material from being separated from the bus bar during the lamination vacuum process. The insulating isolation material can be a conventional back panel, or an insulating back panel or PET, or insulating paint, or insulating glue and other insulating isolation materials, fixed with tape to prevent the insulating isolation material from being separated from the bus bar during the lamination vacuum process.

[0058] In order to further increase the creepage distance and protect the laminate from being corroded by water vapor, a frame is installed around the laminate in this application. A conventional frame or an ultra-thin frame can be used for installation, and it is sealed and bonded by silicone or sealing tape. This design can cover conventional backplane components, conventional double-glass components or double-glass bifacial battery components. The embodiments described in this application can cover monocrystalline battery cell components, polycrystalline battery cell components, heterojunction battery cell components, N-type bifacial battery cell components, and MWT batteries.

[0059] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0060] Although the present application has been described through embodiments, persons skilled in the art will appreciate that there are many modifications and variations of the present application without departing from the spirit of the present application. It is intended that the appended claims include these modifications and variations without departing from the spirit of the present application.

Claims

1. An ultra-densely arranged photovoltaic module, characterized in that: The photovoltaic module comprises: A battery string is composed of battery cells connected in series, wherein the battery cells are connected by interconnection bars, and the spacing between the battery cells ranges from greater than -1.5 mm to less than or equal to 0.5 mm; The battery strings are connected in parallel using inter-string interconnection bars, and the spacing between the battery strings is in the range of greater than or equal to 0.2 mm and less than or equal to 1.5 mm; the battery strings are connected by bus bars to form a battery string group; An insulating isolation material (41) is provided on the bus bar, the insulating isolation material (41) is provided between the EVA or POE packaging material and the bus bar, and the insulating isolation material (41) is U-shaped and covers the upper surface, side surface and lower surface of the bus bar and the battery string group; It also includes a laminate, wherein an aluminum frame is provided at the outer edge of the laminate, the aluminum frame surrounds the laminate, and a silicone adhesive or tape (7) is provided between the laminate and the aluminum frame; An insulating sealing material (4) is arranged around the interior of the laminate, and the insulating sealing material (4) is used to perform built-in edge sealing around the EVA or POE packaging material. The insulating sealing material (4) is arranged between the insulating isolation material (41) and the silicone adhesive or tape (7); The distance from the busbar to the edge of the glass panel is 6 mm; The distance from the battery cell to the edge of the glass panel ranges from greater than 5 mm to less than 17.5 mm.

2. The ultra-densely arranged photovoltaic module according to claim 1, characterized in that: The battery cell is obtained by slicing a conventional battery cell, and the width of the main grid line of the battery cell ranges from greater than or equal to 0.1 mm to less than or equal to 1.1 mm.

3. The ultra-densely arranged photovoltaic module according to claim 1, characterized in that: The interconnection bar adopts a shingling process to weld and connect the two battery cells to the interconnection bar, and the distance between the two battery cells is zero gap.

4. The ultra-densely arranged photovoltaic module according to claim 1, characterized in that: The upper aluminum frame of the laminate was removed.

5. The ultra-densely arranged photovoltaic module according to claim 1, characterized in that: The edges of the cell sheets obtained after slicing are insulated, and the cell sheets are connected in series.

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