Photovoltaic module

Abstract

The utility model provides a photovoltaic assembly, which comprises at least one battery string and a first reflective film, the battery string comprises at least two battery pieces, the first reflective film is arranged at a first gap between the adjacent battery pieces, and a light reflecting layer of the first reflective film is made of non-metal materials. And the light reflecting layer of the first light reflecting film is made of a non-metal material with insulating property, so that the risk of short circuit between adjacent battery pieces of the same battery string can be effectively avoided.

Description

Technical Field

[0001] At least one embodiment of the utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Art

[0002] Glass is a commonly used packaging material for photovoltaic modules. Glass-encapsulated photovoltaic modules, such as double-glass photovoltaic modules, have excellent weather resistance, transparency, barrier properties, mechanical strength and fire resistance, and are widely used in the field of photovoltaic equipment.

[0003] The cells in photovoltaic modules are mostly arranged in the form of cell strings, and the gaps between adjacent cells form non-cell areas where photoelectric conversion cannot be performed, thereby limiting the light-receiving area of ​​the photovoltaic module. In order to utilize the light irradiated on the non-cell area, a reflective film with a light reflection layer can be set on the non-cell area to reflect part of the light irradiated on the area back to the cell through the glass set on the light-receiving surface.

[0004] At present, the light reflection layer used in the reflective film is mostly made of metal materials, such as aluminum. When laminating the photovoltaic module, the light reflection layer is easy to pass through the other layer structures of the reflective film and connect the metal light reflection layer with the electrodes of the battery cell. If the electrodes with opposite polarities (i.e. positive and negative) are connected at the same time, it will cause short circuit failure between the battery cells and / or battery strings. Utility Model Content

[0005] In order to solve at least one of the above and other technical problems in the prior art, the utility model provides a photovoltaic assembly that can effectively prevent the electrodes on adjacent battery cells of the same battery string from being turned on.

[0006] An embodiment of the utility model provides a photovoltaic component, including at least one battery string and a first reflective film, wherein the battery string includes at least two battery cells, the first reflective film is arranged at a first gap between adjacent battery cells, and the light reflection layer of the first reflective film is made of non-metallic material.

[0007] According to an embodiment of the utility model, the first reflective film further comprises a microstructure layer and an adhesive layer stacked in sequence; wherein the light reflecting layer is arranged between the microstructure layer and the adhesive layer, and the first reflective film is bonded to the first surface of the battery cell through the adhesive layer.

[0008] According to an embodiment of the utility model, the side surfaces of the microstructure layer and the adhesive layer are flush with each other.

[0009] According to an embodiment of the utility model, the photovoltaic module further comprises a substrate layer, and the elastic modulus of the substrate layer is greater than the elastic modulus of the microstructure layer.

[0010] According to an embodiment of the present invention, the width of the first reflective film is greater than the width of the first gap.

[0011] According to an embodiment of the utility model, the width of the first reflective film is 3 to 6 mm.

[0012] According to an embodiment of the present invention, the battery cell is a back contact battery cell and further includes an interconnection bar, and the first reflective film is disposed between the interconnection bar and the first surface of the battery cell.

[0013] According to an embodiment of the utility model, the interconnection strip is connected to the joints of two adjacent battery cells, and in the orthographic projection on the first surface, the first reflective film is misaligned with the projection of the joints.

[0014] According to an embodiment of the utility model, the photovoltaic assembly further comprises a second light reflecting film, and the second light reflecting film is arranged at a second gap between two adjacent battery strings.

[0015] According to an embodiment of the present invention, the width of the second reflective film is greater than the width of the second gap.

[0016] According to an embodiment of the present invention, the width of the second reflective film is 5 to 8 mm.

[0017] According to an embodiment of the utility model, the photovoltaic assembly further includes a third light reflecting film; the third light reflecting film surrounds the at least one battery string.

[0018] According to an embodiment of the utility model, the width of the third reflective film is 9 to 15 mm.

[0019] According to an embodiment of the utility model, the non-metal material used in the first reflective film includes at least one of nano titanium dioxide, nano silicon dioxide, barium sulfate, and nano aluminum oxide.

[0020] According to an embodiment of the present invention, the first reflective film is a black or white reflective film.

[0021] According to the photovoltaic module provided by the utility model, the light reflecting layer of the first reflective film is made of an insulating non-metallic material. Even if the light reflecting layer of the first reflective film pierces other layer structures due to process conditions and is connected to the electrodes set on the battery cells, it will not form an electrical connection with the electrodes on the battery cells, which can effectively avoid the risk of short circuit between adjacent battery cells in the same battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a photovoltaic module according to an exemplary embodiment of the present utility model, showing the layer structure of the photovoltaic module;

[0023] Figure 2 yes Figure 1 A schematic structural diagram of a cross section of a photovoltaic assembly of the exemplary embodiment shown;

[0024] Figure 3 yes Figure 2 A top view of a first reflective film of a photovoltaic module of the exemplary embodiment shown;

[0025] Figure 4 yes Figure 3 A cross-sectional view of the reflective film of the exemplary embodiment shown in FIG. 2 taken along the AA axis;

[0026] Figure 5 yes Figure 1 A schematic diagram of a cell string of a photovoltaic assembly according to the exemplary embodiment shown; and

[0027] Figure 6 yes Figure 1 A schematic diagram of a photovoltaic assembly according to an exemplary embodiment is shown from a top view.

[0028] In the drawings, the meanings of the reference numerals are as follows:

[0029] 1. The first glass layer;

[0030] 2. The first adhesive film layer;

[0031] 3. Battery cells;

[0032] 31. Joint;

[0033] 4. The second adhesive film layer;

[0034] 5. Second glass layer;

[0035] 6. The first reflective film;

[0036] 61. Adhesive layer;

[0037] 62. Light reflecting layer;

[0038] 63. Microstructure layer;

[0039] 64. Base material layer;

[0040] 7. Interconnection strip;

[0041] 8. Second reflective film;

[0042] 9. A third reflective film; and

[0043] 10. Border. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0045] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0046] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0047] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0048] The gaps between the cells of a photovoltaic module form a non-cell area where photoelectric conversion cannot be performed. In order to utilize the light irradiated on the non-cell area, a portion of the light can be reflected back to the cell through the glass on the light-receiving surface through a reflective film, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0049] At present, the light reflection layer of the configured reflective film is mainly made of metal materials, such as aluminum. Due to the limitations of the manufacturing process of photovoltaic modules, such as the lamination process, it is easy to cause the light reflection layer to penetrate through other layer structures of the reflective film and connect to the electrode (such as the secondary grid) at the edge of the cell.

[0050] Especially in back-contact cells, since the positive and negative electrodes of the back-contact cells are mostly arranged on the back of the cell in the form of interdigitated electrodes (different doping regions arranged in parallel and at intervals on the back of the cell, such as p+ doping regions and n+ doping regions), adjacent electrodes of opposite sex (i.e., positive electrode and negative electrode, such as the sub-grid) are easily bridged by the light-reflecting layer of the metal material, causing a short circuit between the electrodes (such as the sub-grid), thereby causing the electroluminescence (i.e., EL) of the area to fail and turn black.

[0051] Therefore, how to provide a photovoltaic module with a reflective film that can effectively prevent short circuits of cells in the same cell string has become a technical problem that needs to be solved urgently.

[0052] Figure 1 It is a schematic diagram of a photovoltaic module according to an exemplary embodiment of the utility model, showing the layer structure of the photovoltaic module. Figure 2 yes Figure 1 The schematic diagram of the structure of the cross section of the photovoltaic module of the exemplary embodiment is shown.

[0053] According to the embodiments of the present utility model, Figure 1 and Figure 2 As shown, it includes at least one battery string and a first reflective film 6. The battery string includes at least two battery cells 3, and the first reflective film 6 is arranged at the first gap between adjacent battery cells 3. The light reflection layer 62 of the first reflective film 6 is made of non-metallic material.

[0054] In an illustrative embodiment, Figure 1 As shown, the photovoltaic module includes a sequence (such as Figure 1 The first glass layer 1 (such as front glass), the first adhesive film layer 2 (such as transparent adhesive film), the battery layer (including battery cells 3 arranged in an array), the second adhesive film layer 4 (such as UV cut-off adhesive film, UV is ultraviolet light) and the second glass layer 5 (such as back glass) are stacked from top to bottom. In detail, the multiple battery cells 3 in the battery layer are arranged in a row array and / or a column array at intervals to form at least one battery string.

[0055] In an illustrative embodiment, Figure 2 As shown, the first reflective film 6 is arranged on the side of the cell 3 facing the second glass layer 5 (as shown in FIG. Figure 2 Further, along the thickness direction of the photovoltaic module (such as Figure 2 In the orthographic projection in the up and down direction (as shown), the first reflective film 6 partially overlaps with the projection of the adjacent battery cell 3.

[0056] In such an embodiment, the light reflecting layer 62 of the first light reflecting film 6 is made of non-metallic material and has insulation properties. Even if the light reflecting layer 62 is pierced by other layer structures of the first light reflecting film 6 and connected to the electrodes provided on the battery cell 3 due to the process conditions for manufacturing photovoltaic modules, it will not form an electrical connection with the electrodes. In this way, the risk of short circuit between adjacent battery cells 3 of the same battery string or between the positive and negative electrodes of the back contact battery cells can be effectively avoided.

[0057] In the prior art, not shown in the figure, since the light reflection layer of the reflective film used is mostly made of metal material (such as aluminum), in order to reduce the chance of electrical connection between the light reflection layer and the electrode (such as the secondary grid) of the cell, the reflective film is often bonded to the back glass. When laminating the photovoltaic module, in response to the flow of the adhesive film (such as UV cut-off adhesive film) between the cell and the back glass, the cell will be displaced relative to the back glass, so that in the positive projection direction of the photovoltaic module, the gap between the reflective film and the cell and / or the cell string is offset, causing a portion of light to leak out of the back glass.

[0058] In view of this, if Figure 2 As shown, since the light reflecting layer 62 of the first light reflecting film 6 of the embodiment of the utility model is made of non-metallic material, it is insulated from the electrode on the battery cell 3. Therefore, there is no need to physically increase the distance between the first light reflecting film 6 and the battery cell 3, and it can be directly connected to the surface of the battery cell 3 (such as Figure 2 lower surface shown).

[0059] In such an embodiment, since the first reflective film 6 is directly connected to the surface of the battery cell 3, it will not be affected by the second adhesive film layer 4, and the gap formed between the first reflective film 6 and the battery cell 3 can be effectively avoided from being offset, so as to improve the utilization of light; and since the first reflective film 6 is directly arranged on the battery cell 3, the path of light reflection is correspondingly shortened (that is, the path formed by the distance between the battery cell and the surface facing the second glass layer 5 is reduced), and the energy loss of light passing through the second adhesive film layer 4 is reduced; further, since the first reflective film 6 will not be offset from the gap formed by the battery cell 3, the first reflective film 6 can be arranged to be narrower (such as Figure 2 The spacing between the left and right ends is smaller as shown).

[0060] Figure 3 yes Figure 2 A top view of a first light reflecting film of a photovoltaic module according to an exemplary embodiment is shown. Figure 4 yes Figure 3 The cross-sectional view of the reflective film of the exemplary embodiment is shown along the AA line.

[0061] According to the embodiments of the present utility model, Figure 3 and Figure 4As shown, the first reflective film 6 also includes a microstructure layer 63 and an adhesive layer 61 which are stacked in sequence. Among them, the light reflection layer 62 is arranged between the microstructure layer 63 and the adhesive layer 61, and the first reflective film is bonded to the first surface of the battery cell 3 through the adhesive layer 61. The adhesive layer 61 can fix two adjacent battery cells to a certain extent, maintain the interval between the two adjacent battery cells, and prevent the battery cells from shifting; at the same time, the adhesive layer can protect the microstructure layer 63 and the light reflection layer 62, and prevent the microstructure layer 63 and the light reflection layer 62 from being damaged during lamination.

[0062] According to the embodiments of the present utility model, Figure 3 and Figure 4 As shown, the side surfaces of the microstructure layer 63 and the adhesive layer 61 are flush with each other. In this way, the microstructure layer 63 can prevent light leakage between the sheets, and during the manufacturing process, the first light-reflecting film 6 in a strip shape can be obtained by cutting a large-size film layer.

[0063] According to the embodiments of the present utility model, Figure 3 and Figure 4 As shown, a substrate layer 64 is also included, and the elastic modulus of the substrate layer 64 is greater than the elastic modulus of the microstructure layer 63 .

[0064] In an illustrative embodiment, Figure 3 and Figure 4 As shown, the substrate layer 64, microstructure layer 63 and adhesive layer 61 of the first reflective film 6 are stacked in sequence. The light reflecting layer 62 is disposed between the microstructure layer 63 and the adhesive layer 61, and the elastic modulus of the microstructure layer 63 is configured to be smaller than the elastic modulus of the substrate layer 64.

[0065] In such an embodiment, the substrate layer 64 serves as the main supporting structure of the first reflective film 6 and is suitable for withstanding various mechanical stresses imposed by the external environment. The substrate layer 64 having a higher elastic modulus has a stronger ability to resist deformation and is conducive to distributing the mechanical stress more evenly on other layer structures of each layer of the first reflective film 6; the microstructure layer 63 having a lower elastic modulus is suitable for maintaining the shape of the light reflecting layer 62 so that it can maintain effective reflection of incident light.

[0066] In an illustrative embodiment, Figure 3 and Figure 4As shown, the microstructure layer 63 is disposed on the substrate layer 64. In detail, the microstructure layer 63 includes but is not limited to having a plurality of microstructures arranged side by side. Further, the light reflection layer 62 is formed on the top surface of the microstructure of the microstructure layer 63 to form a coating suitable for reflecting light, so that the light is reflected toward the first glass layer 1 at a certain angle. Among them, the light reflection layer 62 is formed on the microstructure layer 63 by vacuum coating or chemical vapor deposition (i.e., Chemical Vapor Deposition, CVD).

[0067] It should be noted here that any method that can be used to form the light reflecting layer 62 in the art can be selected and applied, such as spraying, filling and other means, which will not be elaborated in detail.

[0068] In such an embodiment, the light reflecting layer 62 deposited by chemical vapor deposition can form a more uniform and dense film structure and has a higher reflectivity compared to the light reflecting layer 62 formed by filling (e.g., the reflectivity of the light reflecting layer formed by filling is approximately 60%-70%, while the reflectivity of the light reflecting layer formed by chemical vapor deposition is approximately 85%-93%).

[0069] In an illustrative embodiment, Figure 3 As shown, the microstructure includes but is not limited to the surface of the substrate layer 64 (such as Figure 4 In detail, the extending direction of the microstructures is parallel to the rolling direction of the first reflective film 6 (as shown in FIG. Figure 3 The angle formed by the up and down directions shown in Figure 3 The angle β shown includes but is not limited to being configured as any angle between 5 and 85 degrees. In a preferred embodiment, β is configured as 45 to 75 degrees, that is, 45 degrees ≤ β ≤ 75 degrees. It should be understood that the embodiments of the present utility model are not limited thereto.

[0070] For example, at least a portion of the microstructures may be configured to have a different spacing than other microstructures.

[0071] In an illustrative embodiment, Figure 4 As shown, the microstructure includes but is not limited to being configured as a triangular prism structure. In detail, the microstructure is arranged along the width direction of the first reflective film 6 (such as Figure 4 The cross section of the cross section (in the left-right direction shown) includes but is not limited to being configured as an isosceles triangle. In detail, the vertex angle of the isosceles triangle formed by the cross section includes but is not limited to being configured as any angle in the range of 45° to 150°.

[0072] In a preferred embodiment, α is configured to be any angle in the range of 100° to 125°, that is, 100°≤α≤125°. Further, the distance between the upper end of the microstructure of the triangular prism structure (i.e., the peak forming the vertex angle) and the substrate layer 64 (i.e., Figure 4 L1) shown in the figure includes but is not limited to being configured to be 10 to 25 microns (i.e., 10 μm ≤ L1 ≤ 25 μm), and the spacing between the lower end of the microstructure of the triangular prism structure (i.e., the valley formed by adjacent triangular prism structures) and the substrate layer 64 (i.e., Figure 4 The L2 shown includes but is not limited to being configured as 0-10 micrometers (ie, 0 μm≤L2≤10 μm). It should be understood that the embodiments of the present invention are not limited thereto.

[0073] For example, the microstructure may also be configured as a triangular prism structure with rounded corners, a terrace structure, a cubic structure, or other arbitrary structures suitable for setting the light reflection layer 62 and reflecting light at a certain angle.

[0074] In an illustrative embodiment, Figure 4 As shown, the thickness of the substrate layer 64 includes but is not limited to being configured to be 5 to 50 microns. Further, the thickness of the microstructure layer 63 includes but is not limited to being configured to be 5 to 30 microns. Further, the thickness of the light reflection layer 62 includes but is not limited to being configured to be 300 to 1000 nanometers. Further, the thickness of the adhesive layer 61 includes but is not limited to being configured to be 25 to 100 microns.

[0075] In an exemplary embodiment, the thickness of the first reflective film 6 includes but is not limited to being configured to be 75 to 180 micrometers. In a preferred embodiment, the thickness of the first reflective film 6 is configured to be 110 to 140 micrometers.

[0076] According to the embodiments of the present utility model, Figure 3 and Figure 4 As shown, the non-metal material used in the first reflective film 6 includes at least one of nano titanium dioxide, nano silicon dioxide, barium sulfate, and nano aluminum oxide.

[0077] In an illustrative embodiment, Figure 4 As shown, the substrate layer 64 includes but is not limited to any one of PI (polyimide), PEEK (polyetheretherketone), PBI (polybenzimidazole), PPS (polyphenylene sulfide), LCP film COC (cycloolefin copolymer), TPX (poly-4-methylpentene-1). Further, the microstructure layer 63 includes but is not limited to any one of UV curing acrylic, epoxy acrylic, phenolic epoxy resin, etc.

[0078] In such an embodiment, the substrate layer 64 formed of the above materials can form a thin film structure with good temperature resistance. The microstructure layer 63 formed of the above materials has strong hardness and rigidity, and is suitable for forming the light reflection layer 62 as a basis.

[0079] In an illustrative embodiment, the adhesive layer 61 includes but is not limited to a heat-crosslinked hot-melt polymer. Specifically, the adhesive layer 61 includes but is not limited to any one of EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), LDPE (low-density polyethylene), and LLDPE (linear low-density polyethylene).

[0080] In such an embodiment, the bonding layer 61 is configured accordingly in response to the material used for the light reflecting layer 62. Since the surface of the inorganic particles used for the light reflecting layer 62 is rich in a large number of polar groups, a strong Si-OH bond can be formed with the silane additive in the material used for the bonding layer 61, so that the light reflecting layer 62 and the bonding layer 61 are well bonded together.

[0081] In an illustrative embodiment, when the first reflective film 6 made of the above-mentioned material is connected to the battery cell 3, the first reflective film 6 cut into a suitable size can be positioned and laid on a heating table, and heated until the adhesive layer 61 is in a molten state (the heating temperature includes but is not limited to being controlled at 75-95° C.); then, the surface of the battery cell 3 connected to the first reflective film 6 (such as the back side of the back contact battery) is made to face the adhesive layer 61 of the first reflective film 6, so that the gap between the battery cells 3 is completely covered by the first reflective film 6 and adhered to the battery cell 3; after the connected battery string is transferred to the welding station, the solder arranged between the interconnection strip 7 (i.e., the welding strip) and the joint 31 (i.e., the welding pad) is melted at a suitable welding temperature (including but not limited to above 200° C.), and finally the battery string is welded.

[0082] Figure 5 yes Figure 1 A schematic diagram of a cell string of a photovoltaic module according to an exemplary embodiment is shown.

[0083] According to the embodiments of the present utility model, Figure 2 As shown, the interconnection bar 7 is connected to the joint portions 31 of two adjacent battery cells 3 , and in the orthographic projection on the first surface, the projection of the first reflective film 6 and the joint portion 31 are misaligned.

[0084] According to the embodiments of the present utility model, Figure 5 As shown, the width of the first reflective film 6 is greater than the width of the first gap.

[0085] According to the embodiments of the present utility model, Figure 2 and 5As shown, the cell 3 is a back contact cell and further includes an interconnection bar 7 . The first reflective film 6 is disposed between the interconnection bar 7 and the first surface of the cell 3 .

[0086] In an illustrative embodiment, Figure 5 As shown, a first gap is formed between adjacent battery cells 3 of the same battery string. In detail, the first light reflecting film 6 is disposed between adjacent battery cells 3 of the same battery string.

[0087] In an illustrative embodiment, not shown in the figure, a secondary grid and a joint portion are provided on the battery cell 3. In detail, a plurality of secondary grids extend in a direction parallel to the first side (such as the long side) of the battery cell 3, and are arranged at equal intervals along the extension direction of the second side (such as the wide side) of the battery cell 3 to collect the current generated by each part of the battery cell. Further, the plurality of secondary grids include a first polarity secondary grid (such as a positive secondary grid, i.e., a secondary grid arranged on the p+ doping region of the battery cell 3 and connected to the p+ doping region) and a second polarity secondary grid (such as a negative secondary grid, i.e., a secondary grid arranged on the n+ doping region of the battery cell 3 and connected to the n+ doping region), and the joint portion 31 (i.e., a pad) is connected to the first polarity secondary grid or the second polarity secondary grid. It should be understood that the embodiments of the utility model are not limited to this.

[0088] For example, the battery cell 3 may be further provided with a main grid extending in a direction parallel to the second side, and a plurality of joint portions 31 may be provided on the main grid.

[0089] In an exemplary embodiment, the interconnection bar 7 (i.e., welding strip) is configured to be connected to the joint 31 (i.e., welding pad) provided on two adjacent battery cells 3. In detail, the interconnection bar 7 (i.e., welding strip) connects the positive electrode of one battery cell 3 to the negative electrode of another battery cell, so that a plurality of battery cells are connected in series to form a battery string.

[0090] In an illustrative embodiment, Figure 2 and Figure 5 As shown, the first reflective film 6 is bonded to the surface of the cell 3 provided with the bonding portion 31 (ie, the pad) (eg, Figure 2 The lower surface shown, Figure 5 In detail, the first reflective film 6 is disposed between the joint portion 31 (i.e., the soldering pad) formed by the two cells 3. Further, the first reflective film 6 covers the portion of the interconnection strip 7 (i.e., the soldering strip) located between the two cells 3, and the light reflection layer 62 of the first reflective film 6 is disposed facing the gap formed by the cells 3 to reflect at least a portion of the light passing through the gap.

[0091] In such an embodiment, the first reflective film 6 disposed between adjacent battery cells 3 of the same battery string can completely shield the portion of the interconnection strip 7 (i.e., welding strip) located between the battery cells 3, thereby avoiding the glare phenomenon caused by the non-directional reflection of light by the interconnection strip 7 (i.e., welding strip); and, since the first reflective film 6 is disposed between the two joints 31 (i.e., welding pads) connected to the interconnection strip 7 (i.e., welding strip), the joints 31 (i.e., welding pads) and the interconnection strip 7 (i.e., welding strip) also play a role in limiting the position of the first reflective film 6 (for example, as Figure 2 The left and right directions shown in the figure) are used to further prevent the first reflective film 6 from being misaligned with respect to the gaps formed between the solar cells 3.

[0092] According to an embodiment of the present invention, the first reflective film 6 is a black or white reflective film.

[0093] In this embodiment, the first reflective film 6 has not only the practical function of reflecting light, but also has an aesthetic function, and can be used as an appearance component. Since it is arranged between the interconnection strip 7 (i.e., the welding strip) and the first surface of the battery cell 3, the photovoltaic module can be viewed from a top view (e.g., Figure 5 The interconnection strip 7 (ie, welding strip) is shielded in the perspective facing the paper surface as shown to improve the aesthetics of the photovoltaic module.

[0094] According to the embodiments of the present utility model, Figure 5 As shown, the width of the first reflective film 6 is 3 to 6 mm.

[0095] In an illustrative embodiment, Figure 2 and Figure 5 As shown, the width of the first reflective film 6 (eg Figure 2 S2) is configured to be larger than the spacing between two adjacent battery cells 3 (as shown in FIG. Figure 2 S1 as shown in the figure) so that both ends of the first reflective film 6 (such as Figure 2 The left and right ends shown in the figure are respectively bonded to the cell sheet 3 on the same side. In detail, the width of the first reflective film 6 includes but is not limited to being configured to be 3 to 6 mm (i.e., 3 mm ≤ S2 ≤ 6 mm). In a preferred embodiment, the width of the first reflective film 6 can be configured to be any value between 4 mm and 5 mm. Furthermore, the length of the first reflective film 6 (e.g., Figure 5 The distance between the upper end and the lower end of the reflective film shown in the figure includes but is not limited to being configured to be substantially the same as the length of the first side (such as the long side) of the battery cell 3, or slightly shorter than the length of the first side. It should be understood that the embodiments of the present utility model are not limited thereto.

[0096] For example, the width of the first reflective film 6 can also be configured to be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm or any other width suitable for simultaneous bonding to two adjacent battery cells 3 .

[0097] Figure 6 yes Figure 1 A schematic diagram of a photovoltaic assembly according to an exemplary embodiment is shown from a top view.

[0098] It should be noted that, in order to make the diagram clear, Figure 6 Only one first battery string is shown (eg Figure 6 Only the second reflective film 8 (such as the first reflective film 6) between the first battery string and the adjacent second battery string (i.e., the battery string located below the first battery string, the second battery string is not shown) is shown. Figure 6 only the third reflective film 9 between the first battery string and the frame 10 is shown.

[0099] It should be understood that the first reflective film 6 is also arranged between the cells of at least a portion of other cell strings of the photovoltaic module; the second reflective film 8 is also arranged between at least a portion of other adjacent cell strings; and the third reflective film 9 is also arranged between at least a portion of other cell strings located at the edge and the frame 10.

[0100] According to the embodiments of the present utility model, Figure 6 As shown, the photovoltaic assembly further includes a second light reflecting film 8, and the second light reflecting film 8 is arranged at the second gap between two adjacent battery strings.

[0101] According to an embodiment of the present invention, the width of the second reflective film 8 is greater than the width of the second gap.

[0102] According to the embodiments of the present utility model, Figure 6 As shown, the width of the second reflective film 8 is 5 to 8 mm.

[0103] In an illustrative embodiment, Figure 6 As shown, the photovoltaic module includes a plurality of side-by-side (such as Figure 6 Specifically, a second reflective film 8 is provided between the battery cells of adjacent battery strings.

[0104] In an illustrative embodiment, Figure 6As shown, the width of the second reflective film 8 is configured to be greater than the spacing between two adjacent battery cells 3 of the adjacent battery string, so that the two ends of the second reflective film 8 are respectively bonded to the battery cells 3 on the same side. In detail, the width of the second reflective film 8 includes but is not limited to being configured to be 5 to 8 mm. In a preferred embodiment, the width of the second reflective film 8 can be configured to be any value between 6 mm and 8 mm. Further, the length of the second reflective film 8 includes but is not limited to being configured to be less than or equal to the length of the battery string. It should be understood that the embodiments of the utility model are not limited to this.

[0105] For example, the width of the second reflective film 8 can also be configured to be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm or any other width suitable for simultaneous bonding to two adjacent battery cells 3.

[0106] According to the embodiments of the present utility model, Figure 6 As shown, the photovoltaic module further comprises a third light reflecting film 9. The third light reflecting film 9 surrounds at least one battery string.

[0107] According to the embodiments of the present utility model, Figure 6 As shown, the width of the third reflective film 9 is 9 to 15 mm.

[0108] In an illustrative embodiment, Figure 6 As shown, the photovoltaic module further includes a frame 10. In detail, the frame 10 includes but is not limited to a structure configured as a substantially rectangular shape. Further, the third reflective film 9 is disposed between the cell 3 located at the edge of the photovoltaic module and the frame 10. The frame 10 includes but is not limited to being made of metal material, such as an aluminum frame 10 or a steel frame 10.

[0109] In an exemplary embodiment, the width of the third reflective film 9 is configured to be greater than the distance between the cell 3 and the inner edge of the adjacent frame 10, so that the two ends of the third reflective film 9 are respectively bonded to the cell 3 and the frame 10 (not shown in the figure). In detail, the width of the third reflective film 9 includes but is not limited to being configured to be 9 to 15 mm. Further, at least three parts of the third reflective film 9 surrounded by the frame 10 (such as Figure 6 The upper part, left part and right part of the battery string in the dotted line are connected to the frame 10 through the third reflective film 9.

[0110] In a preferred embodiment, the width of the third reflective film 9 can be configured to be any value between 9 mm and 10 mm. Further, the length of the third reflective film 9 includes but is not limited to being configured to be the length of the frame 10 (such as Figure 6The length of the side extending in the left-right direction as shown) or the width (as shown Figure 6 It should be understood that the embodiments of the present invention are not limited thereto.

[0111] For example, the width of the third reflective film 9 can also be configured to be 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, 15.5 mm, 16 mm, 16.5 mm, 17 mm or any other width suitable for simultaneous bonding to the battery cell 3 and the adjacent frame 10.

[0112] In an illustrative embodiment, Figure 6 As shown, the second reflective film 8 and / or the third reflective film 9 can be configured to have a different layer structure from the first reflective film 6. In detail, the light reflective layer of the second reflective film 8 and / or the third reflective film 9 can be made of metal material, such as aluminum. Further, the second reflective film 8 or the third reflective film 9 having a light reflective layer of metal material can be arranged between the second adhesive film layer 4 (such as UV cut-off adhesive film, UV is ultraviolet light) and the second glass layer 5 (such as back glass).

[0113] In another exemplary embodiment, not shown in the figure, the second reflective film 8 and / or the third reflective film 9 can be configured as a layer structure that is the same as or similar to the first reflective film 6, such as having a light reflecting layer made of a non-metallic material. Further, the second reflective film 8 can be arranged on the surface of adjacent cells 3 of different cell strings. Furthermore, the third reflective film 9 can also be arranged between the surface of the cell 3 and the adjacent frame 10.

[0114] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only for reference to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention.

[0115] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: It comprises at least one battery string and a first reflective film (6), the battery string comprising at least two battery cells (3), the first reflective film (6) being arranged at a first gap between adjacent battery cells (3), and the light reflection layer (62) of the first reflective film (6) being made of a non-metallic material; The first reflective film (6) further comprises a microstructure layer (63) and an adhesive layer (61) which are stacked in sequence, and the side surfaces of the microstructure layer (63) and the adhesive layer (61) are flush with each other; The light reflection layer (62) is arranged between the microstructure layer (63) and the adhesive layer (61), and the first light reflection film is adhered to the first surface of the cell sheet (3) through the adhesive layer (61).

2. The photovoltaic module according to claim 1, characterized in that: It also includes a substrate layer (64), wherein the elastic modulus of the substrate layer (64) is greater than the elastic modulus of the microstructure layer (63).

3. The photovoltaic module according to claim 1, characterized in that: The width of the first reflective film (6) is greater than the width of the first gap.

4. The photovoltaic module according to claim 3, characterized in that: The width of the first reflective film (6) is 3 to 6 millimeters.

5. The photovoltaic module according to claim 1, characterized in that: The cell (3) is a back-contact cell and further comprises an interconnection bar (7), and the first light-reflecting film (6) is arranged between the interconnection bar (7) and the first surface of the cell (3).

6. The photovoltaic module according to claim 5, characterized in that: The interconnection strip (7) is connected to the joint portions (31) of two adjacent battery cells (3), and in an orthographic projection on the first surface, the first reflective film (6) is misaligned with the projection of the joint portion (31).

7. The photovoltaic module according to any one of claims 1 to 6, characterized in that: It also comprises a second light reflecting film (8), wherein the second light reflecting film (8) is arranged at a second gap between two adjacent battery strings.

8. The photovoltaic module according to claim 7, characterized in that: The width of the second reflective film (8) is greater than the width of the second gap.

9. The photovoltaic module according to claim 8, characterized in that: The width of the second reflective film (8) is 5 to 8 millimeters.

10. The photovoltaic module according to any one of claims 1 to 6, characterized in that: Also includes a third reflective film (9); The third light reflecting film (9) surrounds the at least one battery string.

11. The photovoltaic module according to claim 10, characterized in that: The width of the third reflective film (9) is 9 to 15 millimeters.

12. The photovoltaic module according to any one of claims 1 to 6, characterized in that: The first reflective film (6) is a black or white reflective film.

Images