Photovoltaic module

Abstract

The utility model provides a kind of photovoltaic module, including the front glass, front adhesive film, cell piece module, back adhesive film and back protection member that are sequentially compressed.Electric cell piece module is equipped with string gap and piece gap.Photovoltaic module further includes the first light reflection film strip located at string gap and the second light reflection film strip located at piece gap.The first light reflection film strip and the second light reflection film strip in the application are directly pasted on the side of cell piece module close to back adhesive film, on the one hand, will not be limited by battery string layout accuracy and cell piece spacing tolerance deviation, the width size of the first light reflection film strip and the width size of the second light reflection film strip can be reduced, reduce the manufacturing cost of photovoltaic module, on the other hand, will not be affected by back adhesive film, to be able to effectively reflect the light at string gap and piece gap to cell piece module respectively, so that the utilization rate of light of photovoltaic module increases, improve the power of photovoltaic module, realize effective cost reduction and efficiency improvement.

Description

Technical Field

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

[0002] Photovoltaic power generation technology has matured, and improving the output power of photovoltaic modules and reducing the cost of photovoltaic electricity remain the eternal themes in its development. To increase the utilization rate of light in the unused areas of photovoltaic modules and to improve module power, existing photovoltaic modules incorporate reflective film strips. However, in practical applications, the reflective effect of these strips is poor, failing to effectively reduce costs and improve efficiency. Utility Model Content

[0003] Therefore, it is necessary to provide a photovoltaic module that addresses the problem of poor reflectivity of the reflective film strip in existing photovoltaic modules, which prevents effective cost reduction and efficiency improvement.

[0004] The technical solution is as follows:

[0005] On the one hand, a photovoltaic module is provided, comprising a front glass, a front encapsulant film, a cell module, a back encapsulant film, and a back protective component that are sequentially laminated together;

[0006] The solar cell module has string gaps and cell gaps. The photovoltaic module also includes a first reflective film strip and a second reflective film strip. The first reflective film strip and the second reflective film strip are both attached to the side of the solar cell module near the back adhesive film. The first reflective film strip is located at the string gaps, and the second reflective film strip is located at the cell gaps.

[0007] Compared with existing photovoltaic modules, the photovoltaic module of this application has at least the following advantages: 1. Both the first and second reflective film strips are directly attached to the side of the cell module near the back adhesive film, and are not limited by the accuracy of cell string arrangement or the tolerance deviation of cell spacing. The width of both the first and second reflective film strips can be reduced, lowering the manufacturing cost of the photovoltaic module. 2. With the reduced width of the first and second reflective film strips, the back shading area of ​​the photovoltaic module is reduced, which is beneficial to improving the bifaciality of the photovoltaic module. 3. Since both the first and second reflective film strips are directly attached to the cell module, they are not affected by the back adhesive film, and can effectively reflect light from the string gaps and cell gaps to the cell module, increasing the light utilization rate of the photovoltaic module, improving the power of the photovoltaic module, and achieving effective cost reduction and efficiency improvement.

[0008] The technical solution will be further explained below:

[0009] In one embodiment, the battery cell module includes battery cells, the first reflective film strip includes a first edge and a second edge disposed opposite to each other along its own width direction, the first edge and the second edge being respectively attached to the battery cells located on both sides of the cell gap, and the second reflective film strip includes a third edge and a fourth edge disposed opposite to each other along its own width direction, the third edge and the fourth edge being respectively attached to the battery cells located on both sides of the cell gap.

[0010] In one embodiment, the bonding width between the first edge and the battery cell is the same as the bonding width between the second edge and the battery cell; and / or, the bonding width between the third edge and the battery cell is the same as the bonding width between the fourth edge and the battery cell.

[0011] In one embodiment, the offset tolerance of the first reflective film strip is within ±0.1 mm along the width direction of the first reflective film strip; and / or, the offset tolerance of the second reflective film strip is within ±0.1 mm along the width direction of the second reflective film strip.

[0012] In one embodiment, the width of the first reflective film strip is 3.5 mm to 6 mm.

[0013] In one embodiment, the width of the second reflective film strip is 2.5 mm to 4 mm.

[0014] In one embodiment, the thickness of the first reflective film strip and / or the thickness of the second reflective film strip is 45 μm to 125 μm.

[0015] In one embodiment, the blank area surrounding the battery cell module is also provided with the first reflective film strip and / or the second reflective film strip.

[0016] In one embodiment, the number of string gaps, the number of sheet gaps, the number of first reflective film strips, and the number of second reflective film strips are all at least one, each of the first reflective film strips is correspondingly arranged with each of the string gaps, and each of the second reflective film strips is correspondingly arranged with each of the sheet gaps.

[0017] In one embodiment, the back protection element is configured as a back glass or back panel. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial cross-sectional view of a photovoltaic module according to one embodiment.

[0021] Figure 2 for Figure 1 A partial cross-sectional view of a photovoltaic module along its length.

[0022] Figure 3 for Figure 1 A partial cross-sectional view of a photovoltaic module along its width.

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of a photovoltaic module after the back film and back protective component are hidden.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10. Photovoltaic module; 100. Front glass; 200. Front encapsulating film; 300. Cell module; 310. String gap; 320. Cell gap; 330. Cell; 400. Back encapsulating film; 500. Back protective component; 600. First reflective film strip; 610. First edge; 620. Second edge; 700. Second reflective film strip; 710. Third edge; 720. Fourth edge. Detailed Implementation

[0026] 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.

[0027] To address the problem of poor reflectivity and ineffective cost reduction and efficiency improvement in existing photovoltaic module reflective film strips, the inventors analyzed and researched the technology. They found that in current technology, the reflective film strip is first applied to the back glass, then a back adhesive film is laid on the cell module, and finally the back glass with the reflective film strip applied is laminated. This method is limited by the precision of the cell string arrangement and the tolerance of the cell spacing, resulting in a relatively wide reflective film strip on the back glass. Furthermore, the back adhesive film separates the reflective film strip from the cell module, leading to poor reflectivity and failing to achieve effective cost reduction and efficiency improvement.

[0028] Based on this, the photovoltaic module 10 of the present application is designed and proposed in the following embodiments to solve the above-mentioned technical problems.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a photovoltaic module 10 is provided, including a front glass 100, a front encapsulating film 200, a cell module 300, a back encapsulating film 400, and a back protective member 500, which are sequentially pressed together. The cell module 300 is provided with a string gap 310 and a cell gap 320. The photovoltaic module 10 also includes a first reflective film strip 600 and a second reflective film strip 700. The first reflective film strip 600 and the second reflective film strip 700 are both attached to the side of the cell module 300 near the back encapsulating film 400. The first reflective film strip 600 is located at the string gap 310, and the second reflective film strip 700 is located at the cell gap 320.

[0030] Compared with existing photovoltaic modules, the photovoltaic module 10 of this application has at least the following advantages: 1. Both the first reflective film strip 600 and the second reflective film strip 700 are directly attached to the side of the cell module 300 near the back adhesive film 400, and are not limited by the accuracy of cell string arrangement and the tolerance deviation of cell spacing. The width of the first reflective film strip 600 and the width of the second reflective film strip 700 can be reduced, thereby reducing the manufacturing cost of the photovoltaic module 10. 2. After the width of the first reflective film strip 600 and the width of the second reflective film strip 700 are reduced, the back shading area of ​​the photovoltaic module 10 is reduced, which is beneficial to improving the bifaciality of the photovoltaic module 10. 3. The first reflective film strip 600 and the second reflective film strip 700 are directly attached to the cell module 300 and are not affected by the back adhesive film 400. This allows them to effectively reflect the light at the string gap 310 and the light at the cell gap 320 to the cell module 300, thereby increasing the light utilization rate of the photovoltaic module 10, improving the power of the photovoltaic module 10, and achieving effective cost reduction and efficiency improvement.

[0031] It should be noted that the battery cell module 300 includes multiple battery strings, and each battery string includes multiple battery cells 330. The string gap 310 refers to the gap between two adjacent battery strings. The cell gap 320 refers to the gap between two adjacent battery cells 330 within the same battery string.

[0032] Specifically, in this embodiment, the back protective component 500 is configured as a back glass or a back sheet. Thus, when the back protective component 500 is configured as a back glass, the photovoltaic module 10 corresponds to a double-glass module; when the back protective component 500 is configured as a back sheet, the photovoltaic module 10 corresponds to a single-glass module; that is, it can be compatible with both single-glass and double-glass modules, improving the applicability of the photovoltaic module 10.

[0033] like Figure 2 and Figure 3 As shown, the first reflective film strip 600 further includes a first edge 610 and a second edge 620 disposed opposite to each other along its width direction. The first edge 610 and the second edge 620 are respectively attached to the solar cells 330 located on both sides of the string gap 310. The second reflective film strip 700 includes a third edge 710 and a fourth edge 720 disposed opposite to each other along its width direction. The third edge 710 and the fourth edge 720 are respectively attached to the solar cells 330 located on both sides of the cell gap 320. Thus, the first reflective film strip 600 closes the side of the string gap 310 near the back adhesive film 400, enabling the first reflective film strip 600 to reflect light at the string gap 310, and the second reflective film strip 700 closes the side of the cell gap 320 near the back adhesive film 400, enabling the second reflective film strip 700 to reflect light at the string gap 310, thereby increasing the amount of light received by the solar cell module 300, increasing the light utilization rate of the photovoltaic module 10, and improving the power of the photovoltaic module 10.

[0034] like Figure 2 As shown, optionally, the bonding width between the first edge 610 and the solar cell 330 and the second edge 620 and the solar cell 330 are the same. In this way, the first reflective film strip 600 is centered on two adjacent solar cell strings, ensuring that the first reflective film strip 600 can be reliably attached to the solar cell module 300 while maintaining a small width, reducing the manufacturing cost of the photovoltaic module 10 and increasing the power of the photovoltaic module 10.

[0035] like Figure 2 As shown, optionally, the offset tolerance of the first reflective film strip 600 along its width direction is within ±0.1mm. Thus, by controlling the installation accuracy of the first reflective film strip 600, the bonding area between the first reflective film strip 600 and the battery string is ensured, thereby guaranteeing the connection strength between the first reflective film strip 600 and the battery cell module 300 and improving the reliability of the photovoltaic module 10.

[0036] like Figure 3 As shown, optionally, the bonding width between the third edge 710 and the solar cell 330 is the same as the bonding width between the fourth edge 720 and the solar cell 330. In this way, the second reflective film strip 700 is centered on two adjacent solar cells 330, ensuring that the second reflective film strip 700 can be reliably attached to the solar cell module 300 while maintaining a small width, reducing the manufacturing cost of the photovoltaic module 10 and increasing the power of the photovoltaic module 10.

[0037] like Figure 3 As shown, optionally, the offset tolerance of the second reflective film strip 700 along its width direction is within ±0.1mm. Thus, by controlling the installation accuracy of the second reflective film strip 700, the bonding area between the second reflective film strip 700 and the solar cell 330 is ensured, thereby guaranteeing the connection strength between the second reflective film strip 700 and the solar cell module 300 and improving the reliability of the photovoltaic module 10.

[0038] The length, width, and thickness of the first reflective film strip 600 can be flexibly adjusted according to actual usage needs.

[0039] In one embodiment, the width of the first reflective film strip 600 is 3.5 mm to 6 mm. Specifically, in this embodiment, the width of the first reflective film strip 600 is 3.8 mm. In other embodiments, the width of the first reflective film strip 600 may also be 4.5 mm or 5.5 mm, etc.

[0040] Optionally, the thickness of the first reflective film strip 600 is 45μm to 125μm. This relatively thin design of the first reflective film strip 600 effectively reduces the microcrack rate of the laminated solar cells 330 and improves the yield of the photovoltaic module 10.

[0041] In this specific embodiment, the thickness of the first reflective film strip 600 is 60 μm.

[0042] The length, width, and thickness of the second reflective film strip 700 can be flexibly adjusted according to actual usage needs.

[0043] In one embodiment, the width of the second reflective film strip 700 is 2.5 mm to 4 mm. Specifically, in this embodiment, the width of the second reflective film strip 700 is 2.8 mm. In other embodiments, the width of the second reflective film strip 700 may also be 3 mm or 3.5 mm, etc.

[0044] Optionally, the thickness of the second reflective film strip 700 is 45μm to 125μm. This thinner design of the second reflective film strip 700 effectively reduces the microcrack rate of the laminated solar cells 330 and improves the yield of the photovoltaic module 10.

[0045] In this specific embodiment, the thickness of the second reflective film strip 700 is 60 μm.

[0046] The number of string gaps 310, the number of sheet gaps 320, the number of first reflective film strips 600, and the number of second reflective film strips 700 can all be flexibly adjusted according to actual usage needs.

[0047] like Figure 2 , Figure 3 and Figure 4 As shown, in one embodiment, the number of string gaps 310, the number of cell gaps 320, the number of first reflective film strips 600, and the number of second reflective film strips 700 are all at least one. Each first reflective film strip 600 is correspondingly arranged to each string gap 310. Each second reflective film strip 700 is correspondingly arranged to each cell gap 320. Thus, by providing multiple first reflective film strips 600 and multiple second reflective film strips 700, more light at the gap areas of the cell module 300 can be reflected onto the cell module 300 and utilized for conversion, thereby improving the power of the photovoltaic module 10.

[0048] Optionally, a first reflective film strip 600 and / or a second reflective film strip 700 are also provided in the blank area surrounding the solar cell module 300 to further increase the light utilization rate of the photovoltaic module 10 and improve the power of the photovoltaic module 10. Specifically, in this embodiment, the number of first reflective film strips 600 is greater than or equal to the number of string gaps 310. The number of second reflective film strips 700 is greater than or equal to the number of cell gaps 320.

[0049] It should be noted that the blank area around the cell module 300 refers to the area enclosed by the four edges of the cell module 300 and the four edges of the front adhesive film 200.

[0050] Specifically, in this embodiment, the assembly steps of the photovoltaic module 10 include: first, laying the front adhesive film 200 on one side of the front glass 100; second, installing the cell module 300 on the side of the front adhesive film 200 away from the front glass 100, and arranging the individual cell strings in the cell module 300. Then, attaching each first reflective film strip 600 and each second reflective film strip 700 to the respective string gaps 310 and cell gaps 320 on the cell module 300; finally, after laying the back adhesive film 400 on the side of the cell module 300 away from the front adhesive film 200, covering the back protective member 500 on the side of the back adhesive film 400 away from the cell module 300.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0057] 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.

[0058] 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, It includes the front glass, front adhesive film, battery cell module, back adhesive film and back protective component, which are pressed together in sequence; The solar cell module has string gaps and cell gaps. The photovoltaic module also includes a first reflective film strip and a second reflective film strip. The first reflective film strip and the second reflective film strip are both attached to the side of the solar cell module near the back adhesive film. The first reflective film strip is located at the string gaps, and the second reflective film strip is located at the cell gaps.

2. The photovoltaic module according to claim 1, characterized in that, The battery cell module includes battery cells. The first reflective film strip includes a first edge and a second edge that are arranged opposite to each other along its own width direction. The first edge and the second edge are respectively attached to the battery cells located on both sides of the gap between the cells. The second reflective film strip includes a third edge and a fourth edge that are arranged opposite to each other along its own width direction. The third edge and the fourth edge are respectively attached to the battery cells located on both sides of the gap between the cells.

3. The photovoltaic module according to claim 2, characterized in that, The first edge has the same bonding width with the battery cell as the second edge has the same bonding width with the battery cell; and / or, the third edge has the same bonding width with the battery cell as the fourth edge has the same bonding width with the battery cell.

4. The photovoltaic module according to claim 2, characterized in that, Along the width direction of the first reflective film strip, the offset tolerance of the first reflective film strip is within ±0.1mm; and / or, along the width direction of the second reflective film strip, the offset tolerance of the second reflective film strip is within ±0.1mm.

5. The photovoltaic module according to claim 1, characterized in that, The width of the first reflective film strip is 3.5 mm to 6 mm.

6. The photovoltaic module according to claim 1, characterized in that, The width of the second reflective film strip is 2.5 mm to 4 mm.

7. The photovoltaic module according to claim 1, characterized in that, The thickness of the first reflective film strip and / or the thickness of the second reflective film strip is 45 μm to 125 μm.

8. The photovoltaic module according to claim 1, characterized in that, The blank area surrounding the battery cell module is also provided with the first reflective film strip and / or the second reflective film strip.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The number of string gaps, the number of sheet gaps, the number of first reflective film strips, and the number of second reflective film strips are all at least one. Each first reflective film strip is corresponding to each string gap, and each second reflective film strip is corresponding to each sheet gap.

10. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The back protection component is configured as a back glass or a back panel.

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