Photovoltaic module and solar power generation system

Abstract

The utility model relates to a photovoltaic module and a solar power generation system. The photovoltaic module comprises battery strings and a reflection band, wherein each battery string comprises a plurality of battery pieces which are connected in series; and each reflection band is arranged on the back side of the at least one battery string and is connected with two corresponding adjacent battery pieces so as to be exposed in a gap between the two corresponding adjacent battery pieces. According to the photovoltaic module, the reflection band is arranged on the back side of the battery string, the reflection band can be exposed in the gap between the two corresponding adjacent battery pieces and can emit light rays which penetrate through the panel and enter the gap between the battery pieces, so that the light rays are absorbed by the battery pieces again and cannot penetrate through the back plate, the light absorption capacity of the battery pieces can be improved, and the light absorption efficiency of the battery pieces is improved. The reflectivity of the gaps of the battery pieces can be improved without plating glaze on the back surface of the photovoltaic module, so that the influence on the mechanical property of the glass back plate of the photovoltaic module can be avoided; therefore, the displacement of the battery piece during lamination can be prevented, and the product yield can be improved.

Description

Technical Field

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

[0002] In traditional photovoltaic (PV) modules, there are typically gaps between the cells to prevent short circuits, which also reduces light utilization. Currently, to improve the reflectivity of these gaps, a high-reflectivity coating is usually applied to the glass backsheet of the PV module. However, this high-reflectivity coating is generally initially printed onto the glass using screen printing and then cured onto the glass substrate through high-temperature sintering. During the furnace tempering process, some of the glaze may undergo stress changes, affecting the mechanical properties of the glass backsheet. Utility Model Content

[0003] Therefore, it is necessary to provide a photovoltaic module and a solar power generation system to address the aforementioned technical problems.

[0004] A photovoltaic module, comprising:

[0005] At least one battery string, each battery string comprising multiple battery cells connected in series;

[0006] At least one reflective strip, each reflective strip being disposed on the back side of the at least one battery string and connected to two corresponding adjacent battery cells, so as to be exposed in the gap between the two corresponding adjacent battery cells.

[0007] In one embodiment, the width of each reflective strip is greater than the spacing between the two corresponding adjacent solar cells, so that each reflective strip is connected to the back of the corresponding solar cell.

[0008] In one embodiment, the contact width between each reflective strip and the edge of the corresponding battery cell is 0.8 mm to 1 mm.

[0009] In one embodiment, the at least one reflective strip includes at least one first reflective strip and a plurality of second reflective strips, each first reflective strip being disposed between two corresponding adjacent battery strings, and each second reflective strip being disposed between two corresponding adjacent battery cells in the same battery string.

[0010] In one embodiment, each reflective strip includes a substrate layer, a structural layer, a reflective layer and an adhesive layer stacked sequentially, the adhesive layer being bonded to the corresponding solar cell.

[0011] In one embodiment, the side of the structural layer opposite to the substrate layer is serrated.

[0012] In one embodiment, the thickness of the substrate layer is 45 μm to 55 μm; and / or, the thickness of the structural layer is 25 μm to 35 μm; and / or, the thickness of the reflective layer is 35 nm to 45 nm; and / or, the thickness of the adhesive layer is 5 μm to 15 μm.

[0013] In one embodiment, the photovoltaic module further includes a panel disposed on the front side of the at least one cell string and capable of reflecting light reflected by each reflective strip back to the corresponding cell.

[0014] In one embodiment, the photovoltaic module further includes a backsheet disposed on the back side of the at least one cell string and the at least one reflective strip.

[0015] A solar power generation system includes a support frame and a photovoltaic module as described in any of the preceding claims, the support frame being used to support the photovoltaic module.

[0016] The aforementioned photovoltaic modules and solar power generation systems, by setting a reflective strip on the back side of the cell string, with the reflective strip connected to two adjacent cells and exposed in the gap between them, can reflect light that passes through the panel and is incident on the gap between the cells. This allows the light to be reabsorbed by the cells and not to pass through the backsheet, increasing the light absorption capacity of the cells and improving the conversion efficiency of the photovoltaic module. It also eliminates the need for glazing the back of the photovoltaic module to increase the reflectivity of the cell gap, avoiding any impact on the mechanical properties of the glass backsheet of the photovoltaic module. Furthermore, it eliminates the need to fix the cells to the backsheet, preventing cell displacement during lamination and improving product yield. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a photovoltaic module as shown from the back in one embodiment of this application.

[0018] Figure 2 This is a cross-sectional schematic diagram of a photovoltaic module provided in an embodiment of this application.

[0019] Figure 3 For light in Figure 2 A schematic diagram of propagation in the provided photovoltaic module.

[0020] Figure 4 for Figure 1 A schematic diagram of the cross-section of the reflective strip of the provided photovoltaic module.

[0021] The labels in the attached diagram are explained as follows:

[0022] 10. Photovoltaic module; 100. Cell string; 110. Cell; 200. Reflective strip; 210. First reflective strip; 220. Second reflective strip; 200a. Substrate layer; 200b. Structural layer; 200c. Reflective layer; 200d. Adhesive layer; 300. Panel; 400. Backsheet; 500. First adhesive layer; 600. Second adhesive layer. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 or between cell strings, gaps are present between adjacent cell strings or between adjacent cells 110 within the same cell string. Some light, after passing through the glass panel, escapes through these gaps instead of reaching the surface of the cells, resulting in light waste and thus reducing the power generation of the photovoltaic module.

[0030] Currently, to improve the reflectivity between solar cells, a high-reflectivity coating is typically applied to the glass backsheet of photovoltaic modules. However, this high-reflectivity coating is usually initially printed onto the glass using screen printing and then cured onto the glass substrate through high-temperature sintering. During the furnace tempering process, some of the glaze may undergo stress changes, affecting the mechanical properties of the glass backsheet.

[0031] In this regard, such as Figure 1 and Figure 2As shown, one embodiment of this application provides a photovoltaic module 10, which includes at least one battery string 100, at least one reflective strip 200, a panel 300, and a backsheet 400. The battery string 100 is the core power generation component of the photovoltaic module 10, and its number can be set according to the required output voltage of the photovoltaic module 10. For example, it can be set to one, two, three, or more. When there are multiple battery strings 100, the multiple battery strings 100 can be arranged at intervals along a first direction and / or a second direction and connected by at least one of series and parallel connections to provide output voltage. The first direction is perpendicular to the second direction. Throughout the text, "first direction" refers to... Figure 1 As shown in the figure, "second direction" refers to Figure 1 The diagram shown is accurate. All battery strings 100 can be arranged at intervals along the first direction or the second direction, depending on requirements; alternatively, all battery strings 100 can be arranged in a matrix along the first and second directions. A gap exists between adjacent battery strings 100 to prevent short circuits between them.

[0032] Optionally, two adjacent battery strings 100 are connected by a busbar. The busbar facilitates the series, parallel, or mixed series-parallel connection of multiple battery strings 100. The busbar can be a foil strip made of a highly conductive metal such as copper, aluminum, silver, molybdenum, tin-plated copper, or silver-plated molybdenum. The number of busbars depends primarily on the number of battery strings 100 and their connection method. For example, when the photovoltaic module 10 has three battery strings 100 connected in series along the first direction, two busbars are provided at the first end of the photovoltaic module 10 and two at the second end. Again, for example, when the photovoltaic module 10 has four battery strings 100 connected in series along the first direction, three busbars are provided at the first end of the photovoltaic module 10 and two are spaced apart at the second end.

[0033] like Figure 1 As shown, each battery string 100 includes a plurality of battery cells 110 connected in series and spaced apart along a second direction. A gap exists between adjacent battery cells 110 within the same battery string 100 to prevent short circuits between the battery cells 110.

[0034] The solar cell 110 may be an IBC cell (Interdigitated Back Contact), a TOPCON (Tunnel Oxide Passivated Contact) cell, a PERC cell (Passivated emitter and real cell), or a heterojunction cell. This application does not impose specific restrictions on the type of solar cell 110.

[0035] The number of solar cells 110 in each solar cell string 100 can be set according to the required output voltage of the photovoltaic module 10. For example, it can be set to 2, 3, 4 or more.

[0036] like Figure 1 As shown, adjacent battery cells 110 in the same battery string 100 are connected in series by multiple solder ribbons. Each battery cell 110 has a positive and a negative electrode. When the battery cell 110 is an IBC battery type, both the positive and negative electrodes are located on the back side of the battery cell 110, and the solder ribbons are also located on the back side of the battery cell 110. When the battery cell 110 is another type of battery, the positive and negative electrodes are located on corresponding surfaces of the battery cell 110. For example, the positive electrode is located on the front side of the battery cell 110, and the negative electrode is located on the back side. For adjacent battery cells 110 in the same battery string 100, the positive electrode of the preceding battery cell 110 is connected to the negative electrode of the following battery cell 110 by solder ribbon, or vice versa.

[0037] Optionally, such as Figure 1 As shown, multiple solder strips between two adjacent battery cells 110 in the same battery string 100 are spaced apart along the first direction.

[0038] Each reflective strip 200 is disposed on the rear side of at least one battery string 100 and connected to two corresponding adjacent battery cells 110, so as to be exposed in the gap between the two corresponding adjacent battery cells 110. It should be noted that the two adjacent battery cells 110 here refer to two adjacent battery cells 110 within the same battery string 100, or to two corresponding battery cells 110 in two adjacent battery strings 100 along a first direction; wherein, as... Figure 1 As shown, for two adjacent cells 110 in the same cell string 100, the reflective strip 200 can be laid along the first direction of the photovoltaic module 10 on the edge of the entire cell 110. The reflective strip 200 is insulated to avoid short circuit between the reflective strip 200 and the cell 110 and the solder ribbon.

[0039] The panel 300 is located on the front side of at least one battery string 100 and is capable of reflecting light reflected by each reflective strip 200 back to the corresponding battery cell 110. For example... Figure 3 As shown, when some sunlight passes through panel 300 and reaches reflector strip 200, it is reflected back to panel 300 by reflector strip 200, and then absorbed by solar cell 110 after secondary reflection by panel 300. This increases the power of photovoltaic module 10, preventing sunlight from being emitted from photovoltaic module 10 through backsheet 400. It should be noted that... Figure 3The straight arrows in the diagram represent the propagation path of sunlight. It can be seen that the photovoltaic module 10 provided in this application, by providing a reflective strip 200 on the back side of the cell string 100, exposes the reflective strip 200, which is connected to two adjacent cells 110 and exposed in the gap between them. This allows light passing through the panel 300 and incident on the gap between the cells 110 to be emitted, enabling this light to be reabsorbed by the cells 110 and not to pass through the back panel 400. This increases the light absorption capacity of the cells 110, improves the conversion efficiency of the photovoltaic module 10, and eliminates the need for glazing the back of the photovoltaic module 10 to increase the reflectivity of the gap between the cells 110, thus avoiding any impact on the mechanical properties of the glass back panel of the photovoltaic module 10.

[0040] Optionally, panel 300 can be a glass panel. When sunlight strikes the outer surface of glass panel 300, some of it passes through glass panel 300, and some is reflected by glass panel 300. Therefore, the outer surface of panel 300 can be provided with an anti-reflective film, which can increase the light transmittance of panel 300. It should be noted that when light reflected by reflective strip 200 strikes the inner surface of glass panel 300, some of it will also be reflected by panel 300, and some will pass through glass panel 300.

[0041] A backsheet is disposed on the back side of at least one cell string 100 and at least one reflective strip 200. After the cell string 100 and reflective strip 200 are placed between the panel 300 and the backsheet 400, they can be hot-pressed. The adhesive layer on the panel 300 and the backsheet 400 melts and remains transparent, wrapping the cell string 100 and the reflective strip 200, which can protect the cell 110 and make the photovoltaic module 10 more reliable. Optionally, the adhesive layer on the panel 300 and the backsheet 400 is made of EVA (Ethylene Vinyl Acetate Copolymer) or POE (Polyethylene and Octene Polymer).

[0042] Optionally, the backsheet 400 can be a glass backsheet. The inner surfaces of the glass backsheet 400 and the glass panel 300 are typically designed with an embossed surface. For example, the inner surface of the glass panel may have a hexagonal pattern composed of a series of symmetrical hexagons. This design, under sunlight, can create a prism effect on the glass panel surface, focusing scattered light onto the solar cell 110, increasing the light absorption capacity of the solar cell 110, and improving the conversion efficiency of the photovoltaic module 10. In addition, the pattern on the glass panel can also prevent direct sunlight from hitting the glass surface, reduce reflected light, reduce glare, and improve eye comfort. The textured surface of the glass plate will be uneven and pitted. If the reflective strip 200 is placed on the inner surface of the glass back plate 400, the depth and structure of the texture on the glass plate will inevitably affect the firmness of the reflective strip 200, which may easily cause the reflective strip 200 to shift during high-temperature lamination, affecting the product yield. Based on this, this application connects the reflective strip 200 to the back of the battery cell 110. In this way, it can be exposed in the gap between two adjacent battery cells 110 to reflect light, improving the reflectivity of the gap between the battery cells 110. It can also fix the battery cells 110 without being fixed to the glass back plate, which can prevent the battery cells 110 from shifting during lamination and improve the product yield.

[0043] like Figure 1 As shown, in some embodiments of this application, at least one reflective strip 200 includes at least one first reflective strip 210 and a plurality of second reflective strips 220. Each first reflective strip 210 is disposed between two adjacent battery strings 100, and each second reflective strip 220 is disposed between two adjacent solar cells 110 within the same battery string 100. This arrangement ensures that reflective strips 200 are provided between the gaps of two adjacent battery strings 100 and between the gaps of two adjacent solar cells 110 within the same battery string 100. The reflective strips 200 can reflect light incident on the gaps between the two adjacent battery strings 100 and between the two adjacent solar cells 110 within the same battery string 100, further increasing the light absorption capacity of the solar cells 110 and improving the conversion efficiency of the photovoltaic module 10.

[0044] The number of first reflective strips 210 can be set according to the number of battery strings 100. For example, when the number of battery strings 100 is set to 2, the number of first reflective strips 210 is set to 1. For another example, when the number of battery strings 100 is set to 3, the number of first reflective strips 210 is set to 2.

[0045] The number of second reflective strips 220 can be set according to the number of battery strings 100 and the number of battery cells 110 in each battery string 100. For example, when the number of battery strings 100 is set to 2 and the number of battery cells 110 in each battery string 100 is set to 11, the number of second reflective strips 220 is 20.

[0046] like Figure 2 As shown, in some embodiments of this application, the width W1 of each reflective strip 200 is greater than the spacing H between two adjacent battery cells 110, so that each reflective strip 200 is connected to the back side of the corresponding battery cell 110. During fabrication, the panel 300 is first loaded, then a first adhesive layer 500 is laid on the back side of the panel 300; then, the battery strings 100 are arranged on the first adhesive layer 500, then the reflective strips 200 are pasted onto the back side of the battery cells 110, and then a second adhesive layer 600 is laid on the battery strings 100 and the reflective strips 200; then, a backplate 400 is covered on the second adhesive layer 600, and then EL detection (Electroluminescent detection) is performed; finally, hot pressing is performed. It can be seen that by setting the width W1 of the reflective strip 200 to be greater than the distance H between two adjacent solar cells 110, the reflective strip 200 can be directly connected to the back of the solar cell 110, instead of being placed in the gap between the solar cells 110 and connected to the side of the solar cell 110. This facilitates the connection between the reflective strip 200 and the solar cell 110, reduces the processing difficulty of the photovoltaic module 10, and is beneficial to the production and processing of the photovoltaic module 10.

[0047] Optionally, such as Figure 2 As shown, the contact width W2 between the reflective strip 200 and the edge of the corresponding solar cell 110 is 0.8mm to 1mm, for example, it can be set to 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc., that is, the edge of the solar cell 110 is connected to the reflective strip 200, and the width W2 of this edge is 0.8mm to 1mm. This setting can ensure the connection strength between the reflective strip 200 and the solar cell 110, prevent the reflective strip 200 from falling off the solar cell 110, and also reduce the shading area of ​​the solar cell 110, increase the light absorption capacity of the solar cell 110, and improve the conversion efficiency of the photovoltaic module 10.

[0048] In some embodiments of this application, such as Figure 4 As shown, each reflective strip 200 includes a substrate layer 200a, a structural layer 200b, a reflective layer 200c, and an adhesive layer 200d stacked sequentially. The adhesive layer 200d is bonded to the corresponding solar cell 110. The reflective strip 200 can be fixed to the back of the solar cell 110 using the adhesive layer 200d, thus facilitating the processing and production of the photovoltaic module 10.

[0049] The substrate layer 200a can be made of PET (polyethylene glycol terephthalate), and this application does not impose specific limitations on the material of the substrate layer 200a. Optionally, the thickness of the substrate layer 200a can be 45μm to 55μm, such as 45μm, 46μm, 47μm, 48μm, 49μm, 50μm, 51μm, 52μm, 53μm, 54μm, 55μm, etc. Setting the thickness of the substrate layer 200a in this way allows the thickness of the reflective strip 200 to be set within a reasonable range, which facilitates the bonding of the solder ribbon to the back of the battery cell 110 and also facilitates the production and processing of the reflective strip 200.

[0050] Structural layer 200b is mainly used to support reflective layer 200c, such as... Figure 4 As shown, the side of the structural layer 200b facing away from the substrate layer 200a is serrated. Thus, when the reflective layer 200c is laid after the structural layer 200b, it can also be roughly serrated, facilitating the reflection of light onto the panel 300. The material of the structural layer 200b can be UV resin (ultraviolet curable adhesive), and this application does not impose specific limitations on the material of the structural layer 200b. The structural layer 200b can be directly coated onto the substrate layer 200a, and this application does not limit the arrangement of the structural layer 200b. Optionally, the thickness of the substrate layer 200a can be 25μm~35μm, for example, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, etc. By setting the thickness of the structural layer 200b in this way, the thickness of the reflective strip 200 can be set within a reasonable range, which facilitates the bonding of the solder strip to the back of the battery cell 110 and also facilitates the production and processing of the reflective strip 200.

[0051] The reflective layer 200c can be a reflective aluminum layer, which has a high reflectivity, up to 98%. The reflective layer 200c can be deposited on the structural layer 200b using vacuum deposition; there are no specific limitations on the method of deposition. Optionally, the thickness of the reflective layer 200c can be 35nm~45nm, such as 35nm, 36nm, 37nm, 38nm, 39nm, 40nm, 41nm, 42nm, 43nm, 44nm, 45nm, etc. This thickness setting of the reflective layer 200c allows the thickness of the reflective strip 200 to be within a reasonable range, facilitating both the bonding of the solder ribbon to the back of the solar cell 110 and the production and processing of the reflective strip 200.

[0052] The adhesive layer 200d is made of modified acrylate adhesive, which exhibits strong adhesion. The main raw materials of the modified acrylate adhesive include modified acrylate polymer, anhydride curing agent, and imidazole accelerator, with the specific mass ratio set as follows: 100 parts modified acrylate polymer, 0.3 to 2.5 parts anhydride curing agent, and 0.1 to 0.5 parts imidazole accelerator. The preparation process of the modified acrylate adhesive can be described as follows: the modified acrylate polymer, anhydride curing agent, and imidazole accelerator are mixed according to the above ratio, and the components are thoroughly mixed and chemically reacted through appropriate stirring and heating; after the reaction is complete, the modified acrylate adhesive is obtained.

[0053] The adhesive layer 200d can be directly coated onto the reflective layer 200c, and there are no restrictions on the way the adhesive layer 200d is applied. Optionally, the thickness of the adhesive layer 200d can be 5μm to 15μm, such as 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, etc. Setting the thickness of the adhesive layer 200d in this way allows the thickness of the reflective strip 200 to be set within a reasonable range, which facilitates the bonding of the solder ribbon to the back of the battery cell 110 and also facilitates the production and processing of the reflective strip 200.

[0054] In summary, the photovoltaic module 10 provided in this application, by providing a reflective strip 200 on the back side of the cell string 100, and since the reflective strip 200 is connected to two adjacent cells 110, it can be exposed in the gap between the two adjacent cells 110. In this way, light that passes through the panel 300 and is incident on the gap between the cells 110 can be emitted, so that some of the light can be reabsorbed by the cells 110 and will not pass through the back sheet 400. This increases the light absorption capacity of the cells 110 and improves the conversion efficiency of the photovoltaic module 10. It also eliminates the need to use glazing on the back of the photovoltaic module 10 to improve the reflectivity of the gap between the cells 110, thus avoiding any impact on the mechanical properties of the glass back sheet of the photovoltaic module 10. Furthermore, it eliminates the need to fix it to the back sheet 400, preventing the cells 110 from shifting during lamination and improving product yield.

[0055] On the other hand, one embodiment of this application also provides a solar power generation system, which includes a support frame and a photovoltaic module 10 as described in any of the above claims, the support frame being used to support the photovoltaic module 10.

[0056] This solar power generation system features a reflective strip 200 on the back side of the battery string 100. Since the reflective strip 200 is connected to two adjacent battery cells 110, it is exposed in the gap between the two adjacent cells 110. This allows it to reflect light that passes through the panel 300 and is incident on the gap between the battery cells 110, enabling this light to be reabsorbed by the battery cells 110 and not to pass through the back panel 400. This increases the light absorption capacity of the battery cells 110, improves the conversion efficiency of the photovoltaic module 10, and eliminates the need for glazing the back of the photovoltaic module 10 to enhance the reflectivity of the gap between the battery cells 110, thus avoiding any impact on the mechanical properties of the glass back panel of the photovoltaic module 10. Furthermore, it eliminates the need for fixing the battery cells 110 to the back panel 400, preventing displacement during lamination and improving product yield.

[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 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: at least one battery string, each battery string comprising a plurality of battery pieces connected in series; at least one reflection strip, each reflection strip being arranged on the back side of the at least one battery string and connected with two corresponding adjacent battery pieces to expose to the gap between the two corresponding adjacent battery pieces.

2. The photovoltaic module of claim 1, wherein, The width of each reflection strip is greater than the distance between the two corresponding adjacent battery pieces, so that each reflection strip is connected with the back of the corresponding battery piece.

3. The photovoltaic module of claim 2, wherein, The contact width of each reflection strip with the edge of the corresponding battery piece is 0.8mm-1mm.

4. The photovoltaic module of claim 1, wherein, The at least one reflection strip comprises at least one first reflection strip and a plurality of second reflection strips, each first reflection strip being arranged between two corresponding adjacent battery strings, and each second reflection strip being arranged between two corresponding adjacent battery pieces in the same battery string.

5. The photovoltaic module of claim 1, wherein, Each reflection strip comprises a substrate layer, a structure layer, a light reflection layer and an adhesive layer arranged in sequence, and the adhesive layer is bonded to the corresponding battery piece.

6. The photovoltaic module of claim 5, wherein, The side of the structure layer opposite to the substrate layer is zigzag-shaped.

7. The photovoltaic module of claim 5, wherein, The thickness of the substrate layer is 45μm-55μm; and / or, the thickness of the structure layer is 25μm-35μm; and / or, the thickness of the light reflection layer is 35nm-45nm; and / or, the thickness of the adhesive layer is 5μm-15μm.

8. The photovoltaic module according to any of claims 1 to 7, characterized in that The photovoltaic module further comprises a panel arranged on the front side of the at least one battery string and capable of reflecting the light reflected by each reflection strip to the corresponding battery piece again.

9. The photovoltaic module according to any of claims 1 to 7, characterized in that The photovoltaic module further comprises a back plate arranged on the back side of the at least one battery string and the at least one reflection strip.

10. A solar power system, characterized by, The photovoltaic module comprises a support frame for supporting the photovoltaic module and the photovoltaic module as claimed in any one of claims 1-9.

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