Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, which comprises a reflective structure and a battery string group, the battery string group comprises a plurality of battery pieces, gaps are arranged among the plurality of battery pieces, and the orthographic projection of the reflective structure on the battery string group at least covers the gaps among the plurality of battery pieces; the light reflecting structure comprises a first light reflecting layer close to the battery piece and a second light reflecting layer stacked with the first light reflecting layer, the first light reflecting layer is an organic material layer, and the second light reflecting layer is a metal layer. According to the embodiment of the utility model, the infrared light entering the gaps among the plurality of battery pieces is reflected by the reflective structures, so that the infrared light is irradiated on the battery pieces again, and the battery pieces absorb the infrared light and convert the infrared light into electric energy, thereby improving the power generation power of the photovoltaic assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] In order to meet the user's requirements on the appearance of photovoltaic modules, photovoltaic modules usually need to be made into black.

[0003] Currently, the backsheet of black photovoltaic modules is black, using ordinary black paint. However, the black backsheet absorbs sunlight and generates heat, and compared with white photovoltaic modules, its power generation is lower, the reflectivity is lower, and the module temperature is higher. Utility Model Content

[0004] The utility model provides a photovoltaic component, aiming to solve the technical problems in the prior art that the black photovoltaic component has low power generation power, low reflectivity and high component temperature.

[0005] The embodiment of the utility model provides a photovoltaic assembly, including a reflective structure and a battery string group, wherein the battery string assembly includes a plurality of battery sheets, and there are gaps between the plurality of battery sheets, and the orthographic projection of the reflective structure on the battery string group at least covers the gaps between the plurality of battery sheets;

[0006] The reflective structure includes a first reflective layer close to the cell sheet and a second reflective layer stacked with the first reflective layer. The first reflective layer is an organic material layer, and the second reflective layer is a metal layer.

[0007] Optionally, the reflectivity of the first light reflecting layer to infrared light is greater than the reflectivity of the second light reflecting layer to infrared light, and the first light reflecting layer can transmit part of the infrared light.

[0008] Optionally, it also includes an insulating layer stacked with multiple battery cells, the reflective structure is arranged between the insulating layer and the battery cells, and the first reflective layer, the second reflective layer and the insulating layer are stacked in sequence; or, the reflective structure is embedded in the insulating layer, and the first reflective layer and the second reflective layer are in contact and stacked.

[0009] Optionally, it further comprises an insulating layer stacked with the plurality of battery cells, the first light reflecting layer is located on a side of the insulating layer away from the battery cells, and the insulating layer is provided with light-transmitting grooves corresponding to the gaps between the plurality of battery cells.

[0010] Optionally, a material of the insulating layer is different from a material of the first light reflecting layer.

[0011] Optionally, the insulating layer and the first light reflecting layer are an integrated structure, and the first light reflecting layer is arranged at a position corresponding to the gap between the plurality of battery cells.

[0012] Optionally, the insulating layer includes grooves corresponding to the gaps between the plurality of battery cells, and the first light reflecting layer is embedded in the grooves of the insulating layer.

[0013] Optionally, the battery cell is a back contact battery cell.

[0014] Optionally, a metal interconnection layer is further included, and the plurality of battery cells are electrically connected via the metal interconnection layer.

[0015] Optionally, the second light reflecting layer and the metal interconnect layer are arranged in the same layer, or the second light reflecting layer is the metal interconnect layer.

[0016] Optionally, the metal interconnect layer includes a plurality of conductive groups distributed in an array, each of the conductive groups includes a plurality of metal conductive parts extending along the first direction and arranged at intervals along the second direction;

[0017] An isolation gap is also provided on the metal interconnection layer, and the isolation gap is used to separate two adjacent metal conductive parts in the same conductive group.

[0018] Optionally, the material of the first light reflecting layer includes black pigment.

[0019] Optionally, the battery cells are arranged at intervals along the first direction to form a battery string, and the gaps between the plurality of battery cells include a cell gap between two adjacent battery cells in the same battery string and a string gap between two adjacent battery strings.

[0020] In the embodiment of the utility model, the first reflective layer can transmit and reflect infrared light, the second reflective layer can reflect infrared light, and the reflective structure covers the gaps between the multiple cells, so that the infrared light incident on the gaps between the multiple cells will be reflected by the reflective structure, so that the infrared light is re-irradiated on the cell, so that the cell absorbs the infrared light and converts it into electrical energy, thereby improving the power generation of the photovoltaic module. In addition, in addition to the second reflective layer being able to reflect infrared light, the first reflective layer can also reflect infrared light, thereby improving the reflection and utilization rate of infrared light by the photovoltaic module; in addition, the second reflective layer is a metal layer, and the metal has a good reflection effect; in addition, the infrared light reflected by the reflective structure will be absorbed by the cell and converted into electrical energy, thereby avoiding the temperature increase of the photovoltaic module caused by the black backplane absorbing the heat generated by the sunlight, reducing the temperature of the photovoltaic module when generating electricity, thereby extending the service life of the photovoltaic module.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the photovoltaic module provided by the embodiment of the utility model is shown in FIG. Figure 1 ;

[0023] Figure 2 A schematic diagram of the structure of the reflective structure provided in the embodiment of the utility model Figure 1 ;

[0024] Figure 3 A schematic diagram of the structure of the reflective structure provided in the embodiment of the utility model Figure 2 ;

[0025] Figure 4 A schematic diagram of a top view of a reflective structure and a solar cell provided in an embodiment of the utility model;

[0026] Figure 5 The structure of the photovoltaic module provided by the embodiment of the utility model is shown in FIG. Figure 2 ;

[0027] Figure 6 The structure of the photovoltaic module provided by the embodiment of the utility model is shown in FIG. Figure 3 ;

[0028] Figure 7 The structure of the photovoltaic module provided by the embodiment of the utility model is shown in FIG. Figure 4 ;

[0029] Figure 8 A schematic diagram of the structure of a battery cell, an insulating layer and a metal interconnection layer provided in an embodiment of the utility model;

[0030] Fig. 9 A schematic diagram of the structure of a metal interconnection layer provided in an embodiment of the utility model;

[0031] Fig.10 A schematic diagram of the structure of the insulating layer provided by an embodiment of the utility model;

[0032] Fig.11 A schematic diagram of the structure of the insulating layer and the first light reflecting layer provided in an embodiment of the utility model;

[0033] Fig.12 A schematic diagram of the structure of a battery cell, an insulating layer, a first light reflecting layer and a metal interconnection layer provided in an embodiment of the utility model;

[0034] Fig.13 A schematic diagram of the reflection principle of the reflective structure provided in the embodiment of the utility model in a photovoltaic module;

[0035] Fig.14 A schematic diagram of the reflection principle inside the reflective structure provided in an embodiment of the utility model.

[0036] Reference numerals:

[0037] 1-reflective structure, 11-first reflective layer, 12-second reflective layer, 13-support layer, 2-battery cell, 3-insulating layer, 31-groove, 32-light-transmitting groove, 4-metal interconnect layer, 41-conductive group, 411-metal conductive part, 42-isolation gap, 5-first adhesive film, 6-back plate, 7-second adhesive film, 8-glass cover plate, 9-sheet gap. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] Reference Figure 1 , Figure 2 , Figures 5 to 7 The embodiment of the utility model discloses a photovoltaic module, including a reflective structure 1 and a battery string group, the battery string group includes a plurality of battery cells 2, and there are gaps between the plurality of battery cells 2. The orthographic projection of the reflective structure 1 on the battery string group at least covers the gaps between the plurality of battery cells 2; the reflective structure 1 includes a first reflective layer 11 close to the battery cells 2 and a second reflective layer 12 stacked with the first reflective layer 11, the first reflective layer 11 is an organic material layer, the second reflective layer 12 is a metal layer, the first reflective layer 11 is used to transmit and reflect infrared light, and the second reflective layer 12 is used to reflect infrared light.

[0040] Specifically, the cell 2 includes a light-receiving surface and a backlight surface, and both the light-receiving surface and the backlight surface of the cell 2 may be provided with electrodes. The light-receiving surface of the cell 2 may not be provided with electrodes, and electrodes may only be provided on the backlight surface of the cell 2. In this case, the cell 2 is a back contact (BC) cell. The cell 2 may specifically be a back contact cell of a PERC (Passivated Emitter and Rear Cell) cell, a TOPCon (Tunnel Oxide Passivating Contacts) cell, an HJT (Hetero-junction with Intrinsic Thin-layer) cell, or a hybrid back contact cell of any two or more of the above cells.

[0041] The cells 2 in the photovoltaic module can be connected in series through interconnection strips to form a cell string. When the cell 2 is a back contact cell, the cell 2 can also be electrically connected through a conductive back plate. The reflective structure 1 is preferably located below the plurality of cells 2.

[0042] The photovoltaic module also includes a second adhesive film 7 and a glass cover plate 8 stacked on the plurality of cells 2. Fig.13 The reflective structure 1 is used to reflect the infrared light incident on the gaps between the multiple cells 2. The infrared light reflected by the reflective structure 1 is reflected again by the glass cover 8 to the light-receiving surface of the cell 2, or the infrared light reflected by the reflective structure 1 is received by the backlight surface of the cell 2, so that the cell 2 absorbs the infrared light and converts it into electrical energy to improve the power generation power of the photovoltaic module.

[0043] The battery cells 2 are arranged in a first direction to form a battery string. The first direction can refer to Figure 4 , Fig. 9 and Fig.12 In one embodiment, referring to Figure 4 The gaps between the multiple battery cells 2 include a cell gap 9 between two adjacent battery cells 2 in the same battery string and a string gap between two adjacent battery strings. The width of the reflective structure 1 corresponding to the cell gap 9 is greater than or equal to the width of the cell gap 9, and the width of the reflective structure 1 corresponding to the string gap is greater than or equal to the width of the string gap.

[0044] In one embodiment, there may be an overlapped portion between two adjacent battery cells 2 in the same battery string. In this case, the gap between the plurality of battery cells 2 does not include a cell gap, but only includes a string gap between two adjacent battery strings.

[0045] The photovoltaic module also includes a frame, refer to Figure 4The reflective structure 1 can also cover the edge gap between the plurality of cells 2 and the inner edge of the frame. The width of the reflective structure 1 corresponding to the edge gap is greater than or equal to the width of the edge gap.

[0046] Reference Figure 1 and Figure 2 In one embodiment, the second reflective layer 12 can be integrally formed on the first reflective layer 11. In this case, the photovoltaic module can use a common backplane or a conductive backplane. The conductive backplane includes an insulating layer 3, a metal interconnection layer 4, a first adhesive film 5 and a backplane 6. Figures 5 to 7 In one embodiment, the first light reflecting layer 11 and the second light reflecting layer 12 are separate structures, and when the photovoltaic module adopts a conductive backplane, the second light reflecting layer 12 can be the metal interconnect layer 4 in the conductive backplane.

[0047] The material of the first reflective layer 11 includes black pigment. The material of the first reflective layer 11 may also include resin, or the material of the first reflective layer 11 may also include water and an aqueous dispersant, or the material of the first reflective layer 11 may also include a solvent and an oily dispersant. The black pigment may include at least one of perylene-3,4,9,10 tetracarboxamide derivatives, inorganic chrome black series, and phthalocyanine series. When the material of the first reflective layer 11 includes black pigment, the first reflective layer 11 is black, and the first reflective layer 11 is close to the plurality of cells 2, so that the appearance of the photovoltaic module is uniformly black.

[0048] The second light reflecting layer 12 is a metal layer, and compared with the conventional white substrate layer, the average reflectivity of the infrared band of 750nm-1100nm is about 20% higher. The material of the second light reflecting layer 12 includes at least one of gold, silver, copper, and aluminum. Preferably, the material of the second light reflecting layer 12 includes any one of gold, silver, copper, and aluminum. When the material of the second light reflecting layer 12 is selected from the above materials, the reflection effect of infrared light is good.

[0049] The photovoltaic module can effectively convert solar energy of sunlight with a wavelength of 300nm-1200nm into electrical energy. Sunlight with a wavelength of 720nm-2500nm is near-infrared light. The first reflective layer 11 is specifically used to transmit and reflect near-infrared light, and the second reflective layer 12 is specifically used to reflect near-infrared light. The reflectivity of the first reflective layer 11 to infrared light is greater than the reflectivity of the second reflective layer 12 to infrared light, and the first reflective layer 11 can transmit part of the infrared light.

[0050] In the embodiment of the utility model, the first reflective layer 11 can transmit and reflect infrared light, the second reflective layer 12 can reflect infrared light, and the reflective structure 1 covers the gaps between the multiple cells 2. Therefore, the infrared light incident on the gaps between the multiple cells 2 will be reflected by the reflective structure 1, so that the infrared light is re-irradiated on the cell 2, so that the cell 2 absorbs the infrared light and converts it into electrical energy, thereby improving the power generation of the photovoltaic module. In addition, referring to Fig.14 In addition to the second reflective layer 12 being able to reflect infrared light, the first reflective layer 11 can also reflect infrared light, thereby improving the reflection and utilization rate of infrared light by the photovoltaic module; in addition, the second reflective layer 12 is a metal layer, and the metal has a good reflection effect; in addition, the infrared light reflected by the reflective structure 1 will be absorbed by the battery cell 2 and converted into electrical energy, thereby avoiding the temperature increase of the photovoltaic module caused by the black backplane absorbing the heat generated by sunlight, reducing the temperature of the photovoltaic module when generating electricity, and thus extending the service life of the photovoltaic module.

[0051] Reference Figure 6 and Figure 7 The photovoltaic module provided by the embodiment of the utility model also includes an insulating layer 3 stacked with multiple solar cells 2, the reflective structure 1 is arranged between the insulating layer 3 and the solar cells 2, and the first reflective layer 11, the second reflective layer 12 and the insulating layer 3 are stacked in sequence; or, the reflective structure 1 is embedded in the insulating layer 3, and the first reflective layer 11 and the second reflective layer 12 are in contact and stacked.

[0052] Specifically, the cell 2 includes a plurality of main grid lines and a plurality of auxiliary grid lines, and the insulating layer 3 is used to separate the cell 2 and the metal interconnect layer 4 to prevent the positive and negative electrodes of the cell from being short-circuited. The color of the insulating layer 3 can be white, and it has certain reflective properties to improve the utilization rate of part of the light. The material of the insulating layer 3 can be set according to actual needs, such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polypropylene (PP), polyethylene foam (EPE), etc.

[0053] Figure 6 In the embodiment, the thickness of the first light reflecting layer 11 is less than or equal to the thickness of the insulating layer 3. Before lamination, the first light reflecting layer 11, the second light reflecting layer 12 and the insulating layer 3 are stacked in sequence. After lamination, the first light reflecting layer 11 is embedded in the insulating layer 3.

[0054] Reference Figure 7 When the first light reflecting layer 11 is embedded in the insulating layer 3, the thickness of the first light reflecting layer 11 is less than or equal to the thickness of the insulating layer 3. The bottom surface of the first light reflecting layer 11 away from the battery cell is preferably flush with the bottom surface of the insulating layer 3 away from the battery cell. When the first light reflecting layer 11 is embedded in the insulating layer 3, the height difference caused by the first light reflecting layer 11 being located on one side of the insulating layer 3 can be avoided.

[0055] In one implementation, the first light reflecting layer 11 may also cover a plurality of battery cells 2. In this case, there is no need to provide an insulating layer, and the first light reflecting layer 11 also serves as an insulation layer.

[0056] Reference Figure 5 The photovoltaic module provided by the embodiment of the utility model also includes an insulating layer 3 stacked with multiple battery cells 2, the first reflective layer 11 is located on the side of the insulating layer 3 away from the battery cells 2, and the insulating layer 3 is provided with light-transmitting grooves 32 corresponding to the gaps between the multiple battery cells 2.

[0057] The infrared light incident on the gaps between the plurality of cells 2 is irradiated on the first light reflecting layer 11 through the light-transmitting grooves 32. The width of the light-transmitting grooves 32 is greater than or equal to the width of the gaps between the plurality of cells 2. By providing the light-transmitting grooves 32, the infrared light incident on the gaps between the plurality of cells 2 can be irradiated on the first light reflecting layer 11.

[0058] The material of the insulating layer 3 is different from that of the first light reflecting layer 11 .

[0059] Specifically, the material of the first reflective layer 11 includes a pigment with infrared reflection and infrared transmission functions. The material of the first reflective layer 11 may include at least one of perylene-3,4,9,10 tetracarboxamide derivatives, inorganic chrome black series, and phthalocyanine series. The material of the insulating layer 3 may be an insulating material, such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polypropylene (PP), polyethylene foam (EPE), etc., and does not need to have infrared reflection and infrared transmission functions to save costs. The color of the insulating layer 3 is different from that of the first reflective layer 11. The color of the insulating layer 3 may be white, and the color of the first reflective layer 11 may be black.

[0060] Reference Figure 7 The insulating layer 3 and the first light reflecting layer 11 are an integral structure, and the first light reflecting layer 11 is disposed at a position corresponding to the gap between the plurality of battery cells 2. When the insulating layer 3 and the first light reflecting layer 11 are an integral structure, during laying, only one layer of the insulating layer 3 and the first light reflecting layer 11 of the integral structure needs to be laid, and there is no need to lay the insulating layer 3 and the first light reflecting layer 11 in sequence, and the process is simple.

[0061] The insulating layer 3 is provided with grooves 31 corresponding to the gaps between the plurality of battery cells 2 , and the first light reflecting layer 11 is embedded in the grooves 31 of the insulating layer 3 .

[0062] The width of the slot 31 is greater than or equal to the width of the gap between the plurality of battery cells 2. It should be noted that the portion of the metal interconnect layer 4 corresponding to the slot 31 is preferably not patterned. A small portion of the portion of the metal interconnect layer 4 corresponding to the slot 31 may also be patterned.

[0063] Cell 2 is a back-contact cell. The light-receiving surface of the back-contact cell has no electrode, and both the positive and negative electrodes are arranged on the back-light surface of the cell, thereby reducing the blocking of the light-receiving surface of the cell by the electrode, increasing the light-receiving area of ​​the light-receiving surface of the cell, and improving the energy conversion efficiency of the cell.

[0064] Reference Figure 1 , Figures 5 to 8 The photovoltaic module provided by the embodiment of the utility model further includes a metal interconnection layer 4 , and the plurality of cells 2 are electrically connected via the metal interconnection layer 4 .

[0065] Specifically, different battery strings are connected in parallel through the metal interconnection layer 4, and multiple battery cells 2 in the same battery string are connected in series through the metal interconnection layer 4. When the photovoltaic module adopts a conductive backplane, the conductive backplane includes an insulating layer 3, a metal interconnection layer 4, a first adhesive film 5 and a backplane 6. The insulating layer 3 is located below the battery cell 2, and the metal interconnection layer 4 is located below the insulating layer 3. The material of the metal interconnection layer 4 can be at least one of copper, silver, aluminum, nickel, magnesium, iron, titanium, molybdenum, and tungsten. The material of the metal interconnection layer 4 is preferably copper or aluminum.

[0066] The insulating layer 3 is located between the battery cell 2 and the metal interconnection layer 4. A plurality of through holes may be provided on the insulating layer 3. Conductive parts are provided in the through holes. The battery cell 2 is electrically connected to the metal interconnection layer 4 through the conductive parts. The conductive parts may be conductive glue. The shape of the through hole may be circular or square.

[0067] In the embodiment of the utility model, by setting the metal interconnection layer 4 with low resistivity, compared with the use of traditional interconnection strips, the series resistance of the back contact cell can be reduced, thereby reducing the ohmic loss of the photovoltaic module and improving the photoelectric conversion efficiency of the photovoltaic module.

[0068] When the metal interconnect layer 4 is provided and the color of the insulating layer 3 is white, the infrared light at the backlight side of the cell 2 will also be reflected by the insulating layer 3 and the metal interconnect layer 4 to the backlight side of the cell 2 to be absorbed by the cell 2 and converted into electrical energy.

[0069] The second reflective layer 12 and the metal interconnect layer 4 are arranged on the same layer, or, Figures 5 to 7 , the second light reflecting layer 12 is the metal interconnection layer 4.

[0070] Specifically, when the second light reflecting layer 12 and the metal interconnection layer 4 are provided in the same layer, the second light reflecting layer 12 is the portion of the layer corresponding to the gaps between the plurality of battery cells 2 , and the metal interconnection layer 4 is the portion of the layer excluding the second light reflecting layer 12 .

[0071] The metal interconnection layer 4 is a structure in the conductive backplane. When the metal interconnection layer 4 is used as the second light reflecting layer 12, there is no need to additionally set the second light reflecting layer 12, and only the first light reflecting layer 11 is required, thereby saving costs.

[0072] Reference Fig. 9 The metal interconnection layer 4 includes a plurality of conductive groups 41 distributed in an array, each conductive group 41 includes a plurality of metal conductive parts 411 extending along a first direction and arranged at intervals along a second direction; an isolation gap 42 is also provided on the metal interconnection layer 4, and the isolation gap 42 is used to separate two adjacent metal conductive parts 411 in the same conductive group 41.

[0073] The position of each conductive group 41 corresponds to the position of the battery cell 2. The structure of the insulating layer 3 can be referred to Fig.10 The position of the first light reflecting layer 11 relative to the insulating layer 3 can be referred to Fig.11 The corresponding situation of the insulating layer 3 and the metal interconnection layer 4 can be referred to Fig.12 , Fig.12 In the embodiment, the conductive part arranged in the through hole in the insulating layer 3 is electrically connected to the metal conductive part 411 in the metal interconnection layer 4.

[0074] The isolation gap 42 can insulate the electrical connection between the positive electrode and the negative electrode of the same battery cell 2 and the metal interconnection layer 4 , and at the same time insulate the electrical connection between the adjacent positive electrodes and the negative electrodes in two adjacent battery strings and the metal interconnection layer 4 .

[0075] Reference Figure 2 The first light reflecting layer 11 is integrally formed on the second light reflecting layer 12 .

[0076] Specifically, the reflective structure 1 is located on the side of the insulating layer 3 close to the cell 2. When the second reflective layer 12 is integrally formed on the first reflective layer 11, the reflectivity of the infrared band above 1050nm is higher.

[0077] When the material of the first reflective layer 11 includes resin and black pigment, the first reflective layer 11 can be obtained by laminating, casting, blow molding, etc., and the resin includes at least one of polyethylene, polypropylene, ethylene propylene copolymer, ethylene butene copolymer, ethylene octene copolymer, ethylene vinyl acetate copolymer, polyvinyl chloride, and vinyl chloride. Preferably, polyethylene: polypropylene: ethylene butene copolymer = 1: 0.1: 0-1: 1: 1. When the material of the first reflective layer 11 includes resin and black pigment, the thickness of the first reflective layer 11 can be 10 microns to 200 microns. The thickness of the first reflective layer 11 is preferably 35 microns to 60 microns.

[0078] When the material of the first light reflecting layer 11 includes water, an aqueous dispersant, and a black pigment, the first light reflecting layer 11 is disposed on the second light reflecting layer 12 or the insulating layer 3 or the metal interconnect layer 4 by coating or printing. When the material of the first light reflecting layer 11 includes water, an aqueous dispersant, and a black pigment, the thickness of the first light reflecting layer 11 may be 0.1 micrometers to 20 micrometers. The thickness of the first light reflecting layer 11 is preferably 3 micrometers to 10 micrometers.

[0079] The second light reflecting layer 12 can be prepared by processes such as evaporation, coating, and calendering.

[0080] When the second light reflecting layer 12 is prepared by evaporation or coating, the thickness of the second light reflecting layer 12 can be 0.1 micrometer to 10 micrometers, preferably 0.3 micrometer to 1 micrometer. Figure 3 The reflective structure 1 further comprises a support layer 13, and the support layer 13 is located between the first reflective layer 11 and the second reflective layer 12. The support layer 13 has a certain stiffness, and the thickness of the support layer 13 can be 10 microns to 100 microns, preferably 15 microns to 35 microns. The material of the support layer 13 can include at least one of polyethylene terephthalate, polybutylene terephthalate, poly(1,4-cyclohexanedimethanol terephthalate), polycarbonate, polyamide, and polystyrene.

[0081] When the second reflective layer 12 is prepared by calendering, the first reflective layer 11 only needs to be prepared on the second reflective layer 12 by lamination, coating or other processes. At this time, the material of the first reflective layer 11 includes black pigment and resin, or includes water, aqueous dispersant and black pigment.

[0082] Referring to Table 1, Table 1 shows the near-infrared light reflectivity, surface temperature and photovoltaic module power generation efficiency corresponding to different embodiments of the utility model and the reflective solutions in the prior art.

[0083] Table 1

[0084]

[0085]

[0086] The materials of the first reflective layer 11, the second reflective layer 12 and the support layer 13 in Table 1 are the materials shown in the previous text. The white material used in the reflective layer in the prior art is specifically rutile titanium dioxide. The surface temperature in Table 1 refers to the temperature after 1 hour of irradiation with simulated solar light source. It should be noted that non-standard version components can be used for photovoltaic modules. A hot spot test box can be used to simulate the solar light source, where the light intensity can be 1000W / m 2 .

[0087] Table 2 shows the near-infrared light reflectivity, surface temperature and photovoltaic module power generation efficiency corresponding to different photovoltaic modules in the prior art.

[0088] Table 2

[0089]

[0090] The surface temperature in Table 2 refers to the temperature after 1 hour of irradiation with simulated solar light. It should be noted that non-standard panels can be used for photovoltaic modules. A hot spot test chamber can be used to simulate the solar light source, where the light intensity can be 1000W / m 2 .

[0091] In summary, in the embodiment of the utility model, the reflective structure 1 reflects the infrared light incident to the gaps between the plurality of cells 2, and the infrared light reflected by the reflective structure 1 is reflected again by the glass cover plate 8 to the light receiving surface of the cell 2, or the infrared light reflected by the reflective structure 1 is received by the backlight surface of the cell 2, so that the cell 2 absorbs the infrared light and converts it into electric energy, so as to improve the power generation of the photovoltaic module. At the same time, when the metal interconnection layer 4 is provided and the color of the insulating layer 3 is white, the infrared light at the backlight surface of the cell 2 will also be reflected by the insulating layer 3 and the metal interconnection layer 4 to the backlight surface of the cell 2, so as to be absorbed by the cell 2 and converted into electric energy.

[0092] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0093] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A photovoltaic module, characterized in that: The invention comprises a reflective structure and a battery string group, wherein the battery string group comprises a plurality of battery sheets, and gaps are provided between the plurality of battery sheets, and the orthographic projection of the reflective structure on the battery string group at least covers the gaps between the plurality of battery sheets; The reflective structure includes a first reflective layer close to the cell sheet and a second reflective layer stacked with the first reflective layer. The first reflective layer is an organic material layer, and the second reflective layer is a metal layer.

2. The photovoltaic module according to claim 1, characterized in that: The reflectivity of the first light reflecting layer to infrared light is greater than the reflectivity of the second light reflecting layer to infrared light, and the first light reflecting layer can transmit a portion of infrared light.

3. The photovoltaic module according to claim 1, characterized in that: It also includes an insulating layer stacked with multiple battery cells, the reflective structure is arranged between the insulating layer and the battery cells, and the first reflective layer, the second reflective layer and the insulating layer are stacked in sequence; or, the reflective structure is embedded in the insulating layer, and the first reflective layer and the second reflective layer are in contact and stacked.

4. The photovoltaic module according to claim 1, characterized in that: It also includes an insulating layer stacked with multiple battery cells, the first light reflecting layer is located on a side of the insulating layer away from the battery cells, and the insulating layer is provided with light-transmitting grooves corresponding to the gaps between the multiple battery cells.

5. The photovoltaic module according to claim 3 or 4, characterized in that: The material of the insulating layer is different from that of the first light reflecting layer.

6. The photovoltaic module according to claim 3, characterized in that: The insulating layer and the first light reflecting layer are an integrated structure, and the first light reflecting layer is arranged at a position corresponding to the gap between the plurality of battery cells.

7. The photovoltaic module according to claim 3, characterized in that: The insulating layer includes grooves corresponding to the gaps between the plurality of battery cells, and the first light reflecting layer is embedded in the grooves of the insulating layer.

8. The photovoltaic module according to claim 1, characterized in that: The battery cell is a back contact battery cell.

9. The photovoltaic module according to claim 8, characterized in that: It also includes a metal interconnection layer, and the plurality of battery cells are electrically connected via the metal interconnection layer.

10. The photovoltaic module according to claim 9, characterized in that: The second light reflecting layer and the metal interconnection layer are arranged in the same layer, or the second light reflecting layer is the metal interconnection layer.

11. The photovoltaic module according to claim 9, characterized in that: The metal interconnect layer includes a plurality of conductive groups distributed in an array, each of the conductive groups includes a plurality of metal conductive parts extending along a first direction and arranged at intervals along a second direction; An isolation gap is also provided on the metal interconnection layer, and the isolation gap is used to separate two adjacent metal conductive parts in the same conductive group.

12. The photovoltaic module according to claim 1, characterized in that: The material of the first light reflecting layer includes black pigment.

13. The photovoltaic module according to claim 1, characterized in that: The battery cells are arranged at intervals along a first direction to form a battery string, and the gaps between the plurality of battery cells include a cell gap between two adjacent battery cells in the same battery string and a string gap between two adjacent battery strings.

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