Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, relates to the field of photovoltaic technology, and aims to solve the problem that reflective strips bonded in the column direction and reflective strips bonded in the row direction can form bulges with larger thickness at intersections. And because the bulges are positioned on the same side of the same adhesive film layer, the adhesive film layer is seriously and non-uniformly stressed, and the quality of the photovoltaic module is reduced. The photovoltaic module comprises a battery piece layer, a first sealing layer and a substrate which are arranged in a stacked mode. The battery piece layer comprises a plurality of battery pieces which are arranged in an array, and a first gap is formed between every two adjacent battery pieces in the column direction; and in the row direction, a second gap is formed between two adjacent battery pieces. The first reflective strip is arranged between the battery piece layer and the first sealing layer and located at the first gap. The second reflective strip is arranged between the first sealing layer and the substrate and located at the second gap.

Description

Technical Field

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

[0002] A photovoltaic module generally includes a cover plate, a film layer, a cell layer, a film layer and a back plate which are stacked in sequence from top to bottom.

[0003] The cell layer includes a plurality of cell strings arranged at intervals, and the cell string includes a plurality of welding strips and a plurality of cells arranged at intervals, and the welding strips connect the plurality of cells in series. However, there is a blank area between any two adjacent cells, and the blank area cannot utilize visible light, thereby reducing the photoelectric conversion efficiency of the photovoltaic module.

[0004] In the prior art, reflective strips are usually bonded in the gap between any two adjacent cells (i.e., the blank area), and the reflective strips are bonded on the same side of the same adhesive film layer. At this time, the reflective strips bonded in the column direction and the reflective strips bonded in the row direction will form a thick bulge at the intersection. Since the bulge is located on the same side of the same adhesive film layer, the force on the adhesive film layer is seriously uneven, resulting in a decrease in the quality of the photovoltaic module. Utility Model Content

[0005] The utility model aims to provide a photovoltaic module, which is used to reduce the influence of the reflective strip on the adhesive film layer, so as to ensure the quality of the photovoltaic module.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a photovoltaic module. The photovoltaic module comprises: a stacked battery layer, a first sealing layer and a substrate. The battery layer comprises a plurality of battery cells arranged in an array, and in the column direction, two adjacent battery cells have a first gap; in the row direction, two adjacent battery cells have a second gap. The first reflective strip is arranged between the battery layer and the first sealing layer, and is located at the first gap. The second reflective strip is arranged between the first sealing layer and the substrate, and is located at the second gap.

[0007] It can be seen that the first reflective strip and the second reflective strip are located on both sides of the first sealing layer, and the pressure of the first reflective strip and the second reflective strip on the first sealing layer is dispersed compared with the prior art. At this time, the situation that the first sealing layer is severely unevenly stressed can be improved to reduce the influence of the two reflective strips on the first sealing layer, thereby ensuring the quality of the photovoltaic module.

[0008] In one implementation, the width of the first reflective strip is greater than the width of the first gap, and the width direction of the first reflective strip and the width direction of the first gap are both consistent with the column direction.

[0009] When the above technical solution is adopted, the first reflective strip can cover as much of the blank area at the first gap as possible, so as to improve the utilization rate of visible light by the photovoltaic module, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0010] In one implementation, the width of the second reflective strip is greater than the width of the second gap, and the width direction of the second reflective strip and the width direction of the second gap are both consistent with the row direction.

[0011] When the above technical solution is adopted, the second reflective strip can cover as much of the blank area at the second gap as possible, so as to improve the utilization rate of the photovoltaic module for visible light, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0012] In one implementation, projections of the first reflective strip and the second reflective strip on the substrate have an overlapping portion, and the overlapping portion is located in the first gap.

[0013] When the above technical solution is adopted, light leakage can be further reduced, so as to further improve the utilization rate of visible light by the photovoltaic module, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0014] In one implementation, the photovoltaic assembly further includes an electrical connector. In the column direction, the electrical connector connects two adjacent solar cells, and the first reflective strip is located between the electrical connector and the solar cell.

[0015] When the above technical solution is adopted, in the actual lamination process, two adjacent cells will be close to each other, and an upward or downward bulge will be formed at the bending section of the electrical connector. Since the first reflective strip is located between the electrical connector and the cell, the first reflective strip can reduce or eliminate the damage to the cell caused by the bulge in the electrical connector. Based on this, the safety and quality of the photovoltaic module can be ensured while improving the utilization rate of visible light by the photovoltaic module.

[0016] In one implementation, there are multiple electrical connectors, and the first reflective strip covers all the electrical connectors at the first gap.

[0017] When the above technical solution is adopted, all electrical connectors are shielded by the first reflective strip, which not only improves the aesthetics of the photovoltaic module, but also eliminates the need for additional components to shield the electrical connectors, thereby reducing the production cost of the photovoltaic module.

[0018] In one implementation, the width of the first gap is greater than or equal to 0.3 mm and less than or equal to 0.9 mm; the width of the first reflective strip is greater than or equal to 2 mm and less than or equal to 5 mm.

[0019] In one implementation, the length of the first reflective strip is smaller than the length of the first gap.

[0020] When the above technical solution is adopted, since the first reflective strip is relatively soft and has a certain viscosity, the two ends of the first reflective strip will exceed the first gap during actual lamination, that is, the two ends of the first reflective strip will protrude outwards beyond the cell, and the first reflective strip with a certain viscosity will affect the lamination of the photovoltaic module as a whole. Based on this, in the present utility model, the length of the first reflective strip is set to be less than the length of the first gap, so as to reserve space for the "protrusion" of the first reflective strip in the later stage, thereby ensuring the quality of the photovoltaic module.

[0021] In one implementation, the width of the second gap is greater than or equal to 0.8 mm and less than or equal to 1.6 mm. The width of the second reflective strip is greater than or equal to 2.5 mm and less than or equal to 5.5 mm.

[0022] In one implementation, the thickness of the first reflective strip is equal to the thickness of the second reflective strip.

[0023] When the above technical solution is adopted, the thickness of each part of the photovoltaic module is basically the same or uniform, so as to ensure the safety of each part of the photovoltaic module during actual use.

[0024] In one implementation, the cell is a back-contact cell, and the electrical connector is disposed on a backlight surface of the back-contact cell.

[0025] In one implementation, the first reflective strip includes an insulating layer, a first reflective coating layer and a first substrate layer which are stacked, and the first reflective strip is disposed on the battery cell through the insulating layer.

[0026] When the above technical solution is adopted, the insulating layer can be used to prevent the first reflective coating from directly contacting the cell and causing a short circuit. Furthermore, the above first reflective strip has a simple structure, is easy to manufacture, and improves work efficiency. Furthermore, compared with the prior art that uses a reflective glaze layer to plate a substrate to achieve reflection, the utility model uses a first reflective strip including an insulating layer, a first reflective coating and a first substrate layer to enhance the reflection effect of visible light, thereby improving the utilization rate of visible light by the photovoltaic module and improving the photoelectric conversion efficiency of the photovoltaic module.

[0027] In one implementation, the first reflective strip further includes a first structural layer. The first structural layer is disposed on the first substrate layer, and the first reflective coating is conformally formed on the first structural layer.

[0028] In one implementation, the first structural layer includes a first protruding structure, and the first reflective coating is conformally formed on the first protruding structure, thereby increasing the contact area between the first reflective coating and the first structural layer and improving the firmness of the connection between the first reflective coating and the first structural layer.

[0029] The cross section of the first protrusion structure is triangular, rectangular or fan-shaped. The shapes of the first protrusion structure are various, which increases the selection for the staff. In addition, the shape of the first protrusion structure can be set according to actual conditions, so that the first reflective strip can be adapted to different application scenarios and expand its scope of application.

[0030] In one implementation, the first reflective strip further includes a second reflective coating. Compared with the first reflective coating, the second reflective coating is disposed on the other side of the first substrate layer.

[0031] When the above technical solution is adopted, when the photovoltaic module is a double-glass photovoltaic module, the first reflective coating and the second reflective coating can be used to reflect visible light onto the cell to further improve the utilization rate of visible light by the photovoltaic module, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0032] In one implementation, the second reflective strip includes a third reflective coating layer and a second substrate layer; the third reflective coating layer is in direct contact with the first sealing layer.

[0033] In the case of adopting the above technical solution, since the second reflective strip is arranged between the first sealing layer and the substrate, the second reflective strip does not contact the cell, so there will be no situation where the third reflective coating included in the second reflective strip contacts the cell and causes a short circuit. Based on this, the second reflective strip does not need to include an insulating layer, which further simplifies the structural composition of the second reflective strip and reduces the manufacturing cost. Furthermore, compared with the prior art that uses a reflective glaze layer to plate on the substrate to achieve reflection, the second reflective strip including the third reflective coating and the second substrate layer in the utility model enhances the reflection effect of visible light, thereby improving the utilization rate of visible light by the photovoltaic module and improving the photoelectric conversion efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of a photovoltaic module in an embodiment of the utility model;

[0036] Figure 2 The position relationship between the photovoltaic module and the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0037] Figure 3 The position relationship between the photovoltaic module and the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0038] Figure 4 The position relationship between the photovoltaic module and the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0039] Figure 5 The position relationship between the photovoltaic module and the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 4 ;

[0040] Figure 6 The positional relationship between the photovoltaic module and the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0041] Figure 7 The positional relationship between the photovoltaic module and the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0042] Figure 8 This is a schematic diagram of the positional relationship between the battery sheet, the first reflective strip and the second reflective strip in the embodiment of the utility model;

[0043] Fig. 9 The structure of the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0044] Fig.10 The structure of the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0045] Fig.11 The structure of the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0046] Fig.12 The structure of the first reflective strip in the embodiment of the utility model is shown in FIG. Figure 4 ;

[0047] Fig.13 The structure of the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0048] Fig.14 The structure of the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0049] Fig.15 The structure of the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0050] Fig.16 The structure of the second reflective strip in the embodiment of the utility model is shown in FIG. Figure 4 .

[0051] Reference numerals:

[0052] 1-battery cell layer, 10-battery cell, 11-electrical connector, 110-bending section, 12-first gap, 13-second gap; 2-first sealing layer, 3-substrate, 4-first reflective strip, 40-insulating layer, 41-first reflective coating, 42-first base material layer, 43-first structural layer, 44-first bonding layer, 45-second reflective coating; 5-second reflective strip, 50-third reflective coating, 51-second base material layer, 52-second structural layer, 53-second bonding layer, 54-fourth reflective coating, 55-third bonding layer; 6-cover plate, 7-second sealing layer, 8-welding point. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0056] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0057] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0058] In order to solve the above technical problems, the present utility model provides a photovoltaic module. Figures 1 to 7 , the photovoltaic module comprises: a stacked battery cell layer 1, a first sealing layer 2 and a substrate 3. The battery cell layer 1 comprises a plurality of battery cells 10 arranged in an array, and in the column direction, two adjacent battery cells 10 have a first gap 12; in the row direction, two adjacent battery cells 10 have a second gap 13. The first reflective strip 4 is arranged between the battery cell layer 1 and the first sealing layer 2, and is located at the first gap 12. The second reflective strip 5 is arranged between the first sealing layer 2 and the substrate 3, and is located at the second gap 13. It can be seen that the first reflective strip 4 and the second reflective strip 5 are respectively located on both sides of the first sealing layer 2, and the pressure of the first reflective strip 4 and the second reflective strip 5 on the first sealing layer 2 is dispersed compared with the prior art. At this time, the situation that the first sealing layer 2 is severely unevenly stressed can be improved to reduce the influence of the two reflective strips on the first sealing layer 2, thereby ensuring the quality of the photovoltaic module. It should be noted that when the first gap is a sheet gap, the second gap is a string gap. When the first gap is a string gap, the second gap is a sheet gap.

[0059] As a possible implementation method, the material forming the above-mentioned first sealing layer can be one of ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer, abbreviated as EVA), polyolefin elastomer (Polyolefinelastomer, abbreviated as POE), polyvinyl butyral (Polyvinyl Butyral, abbreviated as PVB), and ionomer.

[0060] The above-mentioned substrate can be a polymer substrate such as KPE, KPF, TPF, or a substrate made of metal backing materials such as aluminum zinc, aluminum magnesium manganese, zinc aluminum magnesium, or a glass substrate. The above-mentioned K can be Arkema's Kynar film, and can also refer to polyvinylidene fluoride (abbreviated as PVDF). The above-mentioned P can be polyethylene terephthalate (abbreviated as PET). The above-mentioned F can be a fluorine-containing coating. The above-mentioned E can be a polyolefin layer, for example, it can be ethylene-vinyl acetate copolymer (abbreviated as EVA), or it can be a blend of EVA and polypropylene. The above-mentioned T can be a DuPont Tedlar film. Exemplarily, the above-mentioned KPE is a polymer substrate formed by three materials: K, P, and E.

[0061] As a possible implementation, see Figures 2 to 6 The photovoltaic module may further include a cover plate 6 and a second sealing layer 7, wherein the cover plate 6 is disposed on the second sealing layer 7, and the second sealing layer 7 is disposed on the cell layer 1. As for the specific structure of the cover plate 6 and the second sealing layer 7, reference may be made to the prior art and will not be described in detail herein.

[0062] As a possible implementation, see Figure 8 , the width W1 of the first reflective strip 4 is greater than the width W2 of the first gap, and the width direction of the first reflective strip 4 and the width direction of the first gap are consistent with the column direction. At this time, the first reflective strip 4 can cover as much of the blank area at the first gap as possible to improve the utilization rate of the photovoltaic module for visible light, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0063] In an alternative approach, see Figure 8 , the width W2 of the first gap is greater than or equal to 0.3 mm and less than or equal to 0.9 mm. For example, the width W2 of the first gap can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or 0.9 mm. The width W1 of the first reflective strip 4 is greater than or equal to 2 mm and less than or equal to 5 mm. For example, the width W1 of the first reflective strip 4 can be 2 mm, 2.3 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0064] As a possible implementation, see Figure 8Since the first reflective strip 4 is relatively soft and has a certain viscosity, the two ends of the first reflective strip 4 will exceed the first gap during actual lamination, that is, the two ends of the first reflective strip 4 will protrude outwards beyond the cell 10. At this time, the first reflective strip 4 with a certain viscosity will affect the lamination of the photovoltaic module as a whole. Based on this, in the embodiment of the utility model, the length L1 of the first reflective strip 4 is set to be less than the length L2 of the first gap, so as to reserve space for the "protrusion" of the first reflective strip 4 in the later stage, thereby ensuring the quality of the photovoltaic module.

[0065] As a possible implementation, see Figure 8 , the width W3 of the second reflective strip 5 is greater than the width W4 of the second gap, and the width direction of the second reflective strip 5 and the width direction of the second gap are consistent with the row direction. At this time, the second reflective strip 5 can cover as much of the blank area at the second gap as possible to improve the utilization rate of the photovoltaic module for visible light, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0066] In an alternative approach, see Figure 8 , the width W4 of the second gap is greater than or equal to 0.8 mm and less than or equal to 1.6 mm. For example, the width W4 of the second gap can be 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or 1.6 mm. The width W3 of the second reflective strip 5 is greater than or equal to 2.5 mm and less than or equal to 5.5 mm. For example, the width W3 of the second reflective strip 5 can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm or 5.5 mm.

[0067] As a possible implementation, see Figure 8 , the length L3 of the second reflective strip 5 is equal to the length L4 of the second gap.

[0068] As a possible implementation, see Figure 8 The projections of the first reflective strip 4 and the second reflective strip 5 on the substrate 3 have an overlapping portion, and the overlapping portion is located in the first gap. At this time, light leakage can be further reduced to further improve the utilization rate of visible light by the photovoltaic module, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0069] It should be noted that Figure 8 It is only used to indicate the size relationship between the first reflective strip, the second reflective strip and the battery sheet, the first gap and the second gap, and is not used to strictly limit the positional relationship between the above-mentioned parts.

[0070] As a possible implementation, the thickness of the first reflective strip is equal to the thickness of the second reflective strip, so that the thickness of each part of the photovoltaic module is substantially the same or consistent, so as to ensure the safety of each part of the photovoltaic module during actual use.

[0071] As a possible implementation, see Figure 2 and Figure 3 The photovoltaic module further includes an electrical connector 11. In the column direction, the electrical connector 11 connects two adjacent cells 10, and the first reflective strip 4 is located between the electrical connector 11 and the cell 10. Exemplarily, the cell 10 and the electrical connector 11 are connected via a welding point 8.

[0072] During the actual lamination process, two adjacent cells 10 will be close to each other, and an upward or downward bulge will be formed at the bent section 110 of the electrical connector 11. Since the first reflective strip 4 is located between the electrical connector 11 and the cell 10, the first reflective strip 4 can reduce or eliminate the damage to the cell 10 caused by the bulge in the electrical connector 11. Based on this, the safety and quality of the photovoltaic module can be ensured while improving the utilization rate of the photovoltaic module for visible light.

[0073] The electrical connector may be a welding strip or other electrical connector for connecting the battery cells. When the electrical connector is a welding strip, the welding strip may be a welding strip with a circular, triangular or rectangular cross section. Preferably, a welding strip with a circular cross section is used. In this case, the mechanical stress at the connection of the battery cells can be dealt with, the problem of hidden cracks in high-density photovoltaic modules can be eliminated, and the reliability of photovoltaic modules can be improved.

[0074] In an optional manner, there are multiple electrical connectors, and the first reflective strip covers all the electrical connectors at the first gap.

[0075] When the above technical solution is adopted, all electrical connectors are shielded by the first reflective strip, which not only improves the aesthetics of the photovoltaic module, but also eliminates the need for additional components to shield the electrical connectors, thereby reducing the production cost of the photovoltaic module.

[0076] In an alternative approach, see Figure 2 and Figure 3 The cell 10 is a back contact cell, and the electrical connector 11 is disposed on the backlight surface of the back contact cell.

[0077] In another alternative, see Figure 7 The electrical connector 11 is respectively disposed on the first surface and the second surface of two adjacent battery cells 10 through the welding points 8 . Figure 7 The second reflective strip is arranged between the first sealing layer and the substrate.

[0078] The composition structures of the first reflective strip and the second reflective strip may be the same or different. A description is given below using a variety of possible situations as examples. It should be understood that the following description is only for understanding and is not intended to be a specific limitation.

[0079] As a possible implementation, see Figure 2 , Figure 3 and Fig. 9 The first reflective strip 4 includes an insulating layer 40 , a first reflective coating layer 41 and a first substrate layer 42 which are stacked. The first reflective strip 4 is disposed on the battery cell 10 through the insulating layer 40 .

[0080] In the case of adopting the above technical solution, the insulating layer 40 can prevent the first reflective coating 41 from directly contacting the cell 10 and causing a short circuit. Furthermore, the above first reflective strip 4 has a simple structure, is easy to manufacture, and improves work efficiency. Further, compared with the prior art that uses a reflective glaze layer to be plated on the substrate 3 to achieve reflection, the embodiment of the utility model uses the first reflective strip 4 including the insulating layer 40, the first reflective coating 41 and the first substrate layer 42 to enhance the reflection effect of visible light, thereby improving the utilization rate of visible light by the photovoltaic module and improving the photoelectric conversion efficiency of the photovoltaic module.

[0081] In an optional manner, the material of the insulating layer may be ethylene-vinyl acetate copolymer (EVA), or other insulating materials. Furthermore, the thickness of the insulating layer is greater than or equal to 30 μm and less than or equal to 90 μm. For example, the thickness of the insulating layer may be 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm or 90 μm, etc.

[0082] In an alternative approach, see Figure 2 and Fig. 9 The insulating layer 40 may be disposed only on the first reflective coating layer 41, or may be disposed on both the first reflective coating layer 41 and the first substrate layer 42 (see Fig.10 Of course, the insulating layer can also be arranged at other positions, such as the two outermost sides of the first reflective strip (see Figure 3 , Fig.11 and Fig.12 ).

[0083] The material of the first reflective coating layer may be aluminum or other reflective materials, and the specific other reflective materials may be other highly reflective materials. Furthermore, the thickness of the first reflective coating layer is greater than or equal to 1 μm and less than or equal to 5 μm. For example, the thickness of the first reflective coating layer may be 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.8 μm or 5 μm, etc.

[0084] In an optional manner, reflective materials of different colors may be coated on the surface of the first reflective coating layer.

[0085] The material of the first substrate layer may be polyethyleneimine (PI). The thickness of the first substrate layer is greater than or equal to 10 μm and less than or equal to 40 μm. For example, the thickness of the first substrate layer may be 10 μm, 12 μm, 15 μm, 18 μm, 2 μm, 23 μm, 25 μm, 28 μm, 3 μm, 32 μm, 35 μm, 38 μm or 40 μm.

[0086] In an alternative approach, see Figures 9 to 12 The first reflective strip 4 may further include a first structural layer 43. The first structural layer 43 is disposed on the first substrate layer 42, and the first reflective coating layer 41 is conformally formed on the first structural layer 43. Exemplarily, the material of the first structural layer 43 may be UV glue, and the thickness of the first structural layer 43 is 15 μm.

[0087] The first structure layer 43 includes a first protruding structure, and the first reflective coating 41 is conformally formed on the first protruding structure. At this time, the contact area between the first reflective coating 41 and the first structure layer 43 can be increased, and the firmness of the connection between the first reflective coating 41 and the first structure layer 43 can be improved.

[0088] In an alternative approach, see Figures 9 to 12 The cross section of the first protrusion structure is a triangle, a rectangle or a sector. When the above technical solution is adopted, the shape of the first protrusion structure is varied, which increases the selection for the staff. In addition, the shape of the first protrusion structure can be set according to the actual situation, so that the first reflective strip 4 can be adapted to different application scenarios and expand its application scope.

[0089] Exemplarily, the cross section of the first protrusion structure is a triangle, and the vertex angle of the triangle (the angle away from the first substrate layer) is greater than or equal to 15° and less than or equal to 45°. For example, the vertex angle may be 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc.

[0090] In an alternative approach, see Fig. 9 and Fig.11 The first reflective strip 4 may further include a first adhesive layer 44, which is disposed on the first substrate layer 42, and the first structural layer 43 is disposed on the first adhesive layer 44. The first adhesive layer 44 can improve the firmness of the connection between the first structural layer 43 and the first substrate layer 42, thereby improving the quality of the first reflective strip 4. Furthermore, the first adhesive layer 44 can be disposed only on one side of the first substrate layer 42, or can be disposed on both sides of the first substrate layer 42 at the same time. When the first adhesive layer 44 is disposed on both sides of the first substrate layer 42 at the same time, the two first structural layers 43 are disposed on the two first adhesive layers 44 respectively (see Fig.11 ).

[0091] In an alternative approach, see Fig.11 and Fig.12 The first reflective strip 4 further includes a second reflective coating 45 . Compared to the first reflective coating 41 , the second reflective coating 45 is disposed on the other side of the first substrate layer 42 .

[0092] When the above technical solution is adopted, when the photovoltaic module is a double-glass photovoltaic module, the first reflective coating 41 and the second reflective coating 45 can be used to reflect visible light onto the cell to further improve the utilization rate of visible light by the photovoltaic module, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0093] In an optional manner, the material of the second reflective coating layer may be aluminum or other reflective materials, and the specific other reflective materials may be other highly reflective materials. Furthermore, the thickness of the second reflective coating layer is greater than or equal to 1 μm and less than or equal to 5 μm. For example, the thickness of the second reflective coating layer may be 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.8 μm or 5 μm, etc.

[0094] In an optional manner, reflective materials of different colors may be coated on the surface of the second reflective coating.

[0095] In an alternative approach, see Fig.11 and Fig.12 An insulating layer 40 may or may not be provided on the second reflective coating layer 45 , and the specific setting is selected according to actual needs.

[0096] The first reflective strip is described below by taking various different composition structures as examples. It should be understood that the following description is only for understanding and is not intended to be a specific limitation.

[0097] Example 1: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41 and a first substrate layer 42 which are stacked in sequence.

[0098] Example 2: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43 and a first substrate layer 42 which are stacked in sequence.

[0099] Example 3: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43, a first adhesive layer 44 and a first substrate layer 42 which are stacked in sequence.

[0100] Example 4: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first substrate layer 42 and a second reflective coating layer 45 which are stacked in sequence.

[0101] Example 5: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43, a first substrate layer 42 and an insulating layer 40 which are stacked in sequence.

[0102] Example 6: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43, a first adhesive layer 44, a first substrate layer 42 and a second reflective coating layer 45 which are stacked in sequence.

[0103] Example 7: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43, a first adhesive layer 44, a first substrate layer 42, a first adhesive layer 44, a first structural layer 43, a second reflective coating layer 45 and an insulating layer 40 which are stacked in sequence.

[0104] Example 8: The first reflective strip 4 includes an insulating layer 40, a first reflective coating layer 41, a first structural layer 43, a first substrate layer 42, a first structural layer 43, a second reflective coating layer 45 and an insulating layer 40 which are stacked in sequence.

[0105] As a possible implementation, see Figure 6 and Fig.13 The second reflective strip 5 includes a third reflective coating layer 50 and a second substrate layer 51 , and the third reflective coating layer 50 is in direct contact with the first sealing layer 2 .

[0106] In the case of adopting the above technical solution, since the second reflective strip 5 is disposed between the first sealing layer 2 and the substrate 3, the second reflective strip 5 does not contact the cell, so there will be no situation where the third reflective coating 50 included in the second reflective strip 5 contacts the cell to cause a short circuit. Based on this, the second reflective strip 5 does not need to include an insulating layer 40, which further simplifies the structure of the second reflective strip 5 and reduces the manufacturing cost. Furthermore, compared with the prior art that uses a reflective glaze layer on the substrate 3 to achieve reflection, the embodiment of the utility model uses the second reflective strip 5 including the third reflective coating 50 and the second substrate layer 51 to enhance the reflection effect of visible light, thereby improving the utilization rate of visible light by the photovoltaic module and improving the photoelectric conversion efficiency of the photovoltaic module.

[0107] In an optional manner, the material of the third reflective coating layer may be aluminum or other reflective materials, and the specific other reflective materials may be other highly reflective materials. Furthermore, the thickness of the third reflective coating layer is greater than or equal to 1 μm and less than or equal to 5 μm. For example, the thickness of the third reflective coating layer may be 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.8 μm or 5 μm, etc.

[0108] In an optional manner, reflective materials of different colors may be coated on the surface of the third reflective coating layer.

[0109] The material of the second substrate layer may be polyethyleneimine (PI). The thickness of the second substrate layer is greater than or equal to 10 μm and less than or equal to 40 μm. For example, the thickness of the second substrate layer may be 10 μm, 12 μm, 15 μm, 18 μm, 2 μm, 23 μm, 25 μm, 28 μm, 3 μm, 32 μm, 35 μm, 38 μm or 40 μm, etc.

[0110] In an alternative approach, see Figure 6 , Figures 13 to 16 The second reflective strip 5 may further include a second structural layer 52, the second structural layer 52 is disposed on the second substrate layer 51, and the third reflective coating 50 is conformally formed on the second structural layer 52. Exemplarily, the material of the second structural layer 52 may be UV glue, and the thickness of the second structural layer 52 is 15 μm.

[0111] The second structure layer 52 includes a second protruding structure, and the third reflective coating 50 is conformally formed on the second protruding structure. This can increase the contact area between the third reflective coating 50 and the second structure layer 52, and improve the firmness of the connection between the third reflective coating 50 and the second structure layer 52.

[0112] In an alternative approach, see Figure 6 , Figures 13 to 16 The cross section of the second protrusion structure is a triangle, a rectangle or a sector. When the above technical solution is adopted, the shape of the second protrusion structure is varied, which increases the selection for the staff. In addition, the shape of the second protrusion structure can be set according to the actual situation, so that the second reflective strip 5 can be adapted to different application scenarios and expand its application scope.

[0113] Exemplarily, the cross section of the second protrusion structure is a triangle, and the vertex angle of the triangle (the angle away from the second substrate layer) is greater than or equal to 15° and less than or equal to 45°. For example, the vertex angle may be 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc.

[0114] In an alternative approach, see Fig.14 and Fig.15 The second reflective strip 5 may further include a second adhesive layer 53, which is disposed on the second substrate layer 51, and the second structural layer 52 is disposed on the second adhesive layer 53. The second adhesive layer 53 may improve the firmness of the connection between the second structural layer 52 and the second substrate layer 51, thereby improving the quality of the second reflective strip 5. Furthermore, the second adhesive layer 53 may be disposed on only one side of the second substrate layer 51, or may be disposed on both sides of the second substrate layer 51. When the second adhesive layer 53 is disposed on both sides of the second substrate layer 51, the two second structural layers 52 are disposed on the two second adhesive layers 53, respectively.

[0115] In an alternative approach, see Fig.15 and Fig.16 The second reflective strip 5 further includes a fourth reflective coating 54 ; compared to the third reflective coating 50 , the fourth reflective coating 54 is disposed on the other side of the second substrate layer 51 .

[0116] When the above technical solution is adopted, when the photovoltaic module is a double-glass photovoltaic module, the third reflective coating 50 and the fourth reflective coating 54 can be used to reflect visible light onto the cell to further improve the utilization rate of visible light by the photovoltaic module, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0117] In an optional manner, the material of the fourth reflective coating layer may be aluminum or other reflective materials, and the specific other reflective materials may be other highly reflective materials. Furthermore, the thickness of the fourth reflective coating layer is greater than or equal to 1 μm and less than or equal to 5 μm. For example, the thickness of the fourth reflective coating layer may be 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.8 μm or 5 μm, etc.

[0118] In an optional manner, reflective materials of different colors may be coated on the surface of the fourth reflective coating layer.

[0119] In an alternative approach, see Figures 14 to 16 The second reflective strip 5 may further include a third adhesive layer 55 disposed on a layer farthest from the third reflective coating layer 50. At this time, the other structures of the second reflective strip 5 are bonded to the substrate 3 via the third adhesive layer 55.

[0120] The second reflective strip is described below by taking various different composition structures as examples. It should be understood that the following description is only for understanding and is not intended to be a specific limitation.

[0121] Example 1: The second reflective strip 5 includes a third reflective coating layer 50 and a second substrate layer 51 which are stacked in sequence.

[0122] Example 2: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52 and a second substrate layer 51 which are stacked in sequence.

[0123] Example 3: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52, a second adhesive layer 53, a second substrate layer 51 and a fourth reflective coating layer 54 which are stacked in sequence.

[0124] Example 4: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52, a second substrate layer 51, a second structural layer 52 and a fourth reflective coating layer 54 which are stacked in sequence.

[0125] Example 5: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52, a second adhesive layer 53, a second substrate layer 51, a second adhesive layer 53, a second structural layer 52 and a fourth reflective coating layer 54 which are stacked in sequence.

[0126] Example 6: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52, a second substrate layer 51, a second structural layer 52, a fourth reflective coating layer 54 and a third adhesive layer 55 which are stacked in sequence.

[0127] Example 7: The second reflective strip 5 includes a third reflective coating layer 50, a second structural layer 52, a second adhesive layer 53, a second substrate layer 51, a second structural layer 52, a fourth reflective coating layer 54 and a third adhesive layer 55 which are stacked in sequence.

[0128] Example 8: The second reflective strip 5 includes a third reflective coating 50, a second structural layer 52, a second adhesive layer 53, a second substrate layer 51, a second adhesive layer 53, a second structural layer 52, a fourth reflective coating 54 and a third adhesive layer 55 which are stacked in sequence.

[0129] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. It should be noted that the third reflective coating 50 of the second reflective strip 5 may also be covered with an insulating layer, but preferably not covered with an insulating layer, which is applicable to the solutions of Examples 1 to 8.

[0130] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: include: A stacked battery cell layer, a first sealing layer and a substrate; the battery cell layer includes a plurality of battery cells arranged in an array; In the column direction, two adjacent battery cells have a first gap; in the row direction, two adjacent battery cells have a second gap; A first reflective strip is disposed between the battery layer and the first sealing layer and located at the first gap; The second reflective strip is disposed between the first sealing layer and the substrate and is located at the second gap.

2. The photovoltaic module according to claim 1, characterized in that: The width of the first reflective strip is greater than the width of the first gap, and the width direction of the first reflective strip and the width direction of the first gap are both consistent with the column direction; The width of the second reflective strip is greater than the width of the second gap; the width direction of the second reflective strip and the width direction of the second gap are both consistent with the row direction.

3. The photovoltaic module according to claim 1, characterized in that: Projections of the first reflective strip and the second reflective strip on the substrate have an overlapping portion, and the overlapping portion is located in the first gap.

4. The photovoltaic module according to claim 1, characterized in that: It also includes an electrical connector, which connects two adjacent battery cells in the column direction, and the first reflective strip is located between the electrical connector and the battery cells.

5. The photovoltaic module according to claim 4, characterized in that: There are multiple electrical connectors, and the first reflective strip covers all of the electrical connectors at the first gap.

6. The photovoltaic module according to claim 2, characterized in that: The width of the first gap is greater than or equal to 0.3 mm and less than or equal to 0.9 mm; The width of the first reflective strip is greater than or equal to 2 mm and less than or equal to 5 mm.

7. The photovoltaic module according to claim 1, characterized in that: The length of the first reflective strip is smaller than the length of the first gap.

8. The photovoltaic module according to claim 2, characterized in that: The width of the second gap is greater than or equal to 0.8 mm and less than or equal to 1.6 mm; The width of the second reflective strip is greater than or equal to 2.5 mm and less than or equal to 5.5 mm.

9. The photovoltaic module according to claim 1, characterized in that: The thickness of the first reflective strip is equal to the thickness of the second reflective strip.

10. The photovoltaic module according to claim 4, characterized in that: The battery cell is a back contact battery cell, and the electrical connector is arranged on the backlight surface of the back contact battery cell.

11. The photovoltaic module according to any one of claims 1 to 10, characterized in that: The first reflective strip comprises an insulating layer, a first reflective coating layer and a first substrate layer which are stacked; the first reflective strip is arranged on the battery sheet through the insulating layer.

12. The photovoltaic module according to claim 11, characterized in that: It also includes a first structural layer, which is disposed on the first substrate layer, and the first reflective coating is conformally formed on the first structural layer.

13. The photovoltaic module according to claim 12, characterized in that: The first structural layer includes a first protruding structure, and the first light-reflecting coating is conformally formed on the first protruding structure; the cross-section of the first protruding structure is triangular, rectangular or fan-shaped.

14. The photovoltaic module according to claim 11, characterized in that: The first reflective strip further includes a second reflective coating layer; compared to the first reflective coating layer, the second reflective coating layer is disposed on the other side of the first substrate layer.

15. The photovoltaic module according to any one of claims 1 to 10, characterized in that: The second reflective strip comprises a third reflective coating layer and a second substrate layer; the third reflective coating layer is in direct contact with the first sealing layer.

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