All-black photovoltaic module and photovoltaic power generation system

Abstract

The utility model is applicable to the technical field of photovoltaic modules, and provides an all-black photovoltaic module and a photovoltaic power generation system, and the all-black photovoltaic module comprises a back plate, a first adhesive film, a battery string layer, a second adhesive film and a front plate which are sequentially stacked. Wherein a first high-reflection black film is arranged in a gap area between two adjacent battery strings of the battery string layer, and each first high-reflection black film covers the corresponding gap area; and a second high-reflection black film is arranged in the peripheral area of the battery string layer and covers the edge area of the first adhesive film. According to the all-black photovoltaic module, a high-reflection all-black backboard or black glazed backboard glass does not need to be adopted as the backboard, and the backboard can be a common backboard or common backboard glass, so that the cost of the backboard and the difficulty of a production process can be reduced, and the production cost of the all-black photovoltaic module is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic modules, and particularly relates to a fully black photovoltaic module and a photovoltaic power generation system. Background Art

[0002] In order to improve the power generation efficiency of photovoltaic modules and the overall appearance of photovoltaic modules, fully black photovoltaic modules have received increasing attention.

[0003] In the prior art, a fully black photovoltaic module generally includes a backplane, a first encapsulant film, a battery string layer, a second encapsulant film and a front plate which are stacked in sequence. Among them, the battery string layer generally includes a plurality of battery strings arranged in parallel. In order to make the gap area between adjacent battery strings in the battery string layer also present a black effect, a single-glass photovoltaic module usually adopts a highly reflective fully black backplane, while a double-glass photovoltaic module uses black enameled glass as the backplane, and black enamel is correspondingly provided in the gap area corresponding to the battery strings, so as to achieve a fully black effect on the front appearance of the module. However, whether a highly reflective fully black backplane or black enameled backplane glass is used as the backplane, the cost of the backplane will be increased, resulting in a relatively high production cost of the fully black photovoltaic module. Summary of the Utility Model

[0004] The utility model provides a fully black photovoltaic module, aiming to solve the problem of high production cost of fully black photovoltaic modules in the prior art.

[0005] The utility model is realized as follows: a fully black photovoltaic module is provided, which includes a backplane, a first encapsulant film, a battery string layer, a second encapsulant film and a front plate which are stacked in sequence;

[0006] Wherein, a first highly reflective black film is provided in the gap area between adjacent two battery strings of the battery string layer, and each first highly reflective black film covers the corresponding gap area;

[0007] A second highly reflective black film is provided in the peripheral area of the battery string layer, and the second highly reflective black film covers the edge area of the first encapsulant film.

[0008] Preferably, the first highly reflective black film and / or the second highly reflective black film partially covers the front or back of the adjacent battery strings.

[0009] Preferably, the first highly reflective black film and the second highly reflective black film have the same composition.

[0010] Preferably, the first highly reflective black film and the second highly reflective black film are at the same height along the direction of the battery string.

[0011] Preferably, the first highly reflective black film and / or the second highly reflective black film comprises a substrate layer, and a highly reflective black functional layer is disposed on a side of the substrate layer close to the front plate.

[0012] Preferably, the substrate layer is formed by laminating one or at least two of a PET layer, a PI layer, and a PE layer.

[0013] Preferably, the highly reflective black functional layer is a highly reflective black coating applied on the substrate layer or a highly reflective black thin film laminated on the substrate layer.

[0014] Preferably, the width of the second highly reflective black film is greater than the width of the first highly reflective black film.

[0015] Preferably, the width of the first highly reflective black film is d1, where 2 mm < d1 < 8 mm; the width of the second highly reflective black film is d2, where 12 mm < d2 < 30 mm.

[0016] Preferably, the thickness of the first highly reflective black film and / or the second highly reflective black film is h1, where 0.05 mm < h1 < 0.8 mm.

[0017] The present utility model further provides a photovoltaic power generation system, comprising the all-black photovoltaic module described above.

[0018] The all-black photovoltaic module provided by the present utility model is provided with a first highly reflective black film and a second highly reflective black film. The first highly reflective black film is disposed in a gap area between adjacent battery strings of the battery string layer. By using the first highly reflective black film to cover the gap area between adjacent battery strings, the gap area between adjacent battery strings presents a black effect. The second highly reflective black film is disposed in a peripheral area of the battery string layer. By using the second highly reflective black film to cover the edge area of the first encapsulant film, the peripheral area of the battery string layer also presents a black effect, so that the front appearance of the module achieves an all-black effect. The backplane of the all-black photovoltaic module can adopt a common backplane or a common backplane glass, without using a highly reflective all-black backplane or a black enameled backplane glass as the backplane. The backplane can adopt a common backplane or a common backplane glass, thereby reducing the cost of the backplane and the production process difficulty, and thus reducing the production cost of the all-black photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an all-black photovoltaic module provided by an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of another all-black photovoltaic module provided by an embodiment of the present utility model;

[0021] Figure 3Schematic diagram of the first highly reflective black film and the second highly reflective black film of a fully black photovoltaic module provided by an embodiment of the present invention. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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.

[0023] In an embodiment of the present invention, a first highly reflective black film is provided in the gap area between two adjacent battery strings in the battery string layer of a fully black photovoltaic module. The first highly reflective black film is used to cover the gap area between adjacent battery strings, so that the gap area between adjacent battery strings presents a black effect; a second highly reflective black film is provided in the peripheral area of the battery string layer. The second highly reflective black film is used to cover the edge area of the first glue film, so that the peripheral area of the battery string layer also presents a black effect, and the front appearance of the module realizes a fully black effect. The backplane of the fully black photovoltaic module can adopt a common backplane or a common backplane glass, without using a highly reflective fully black backplane or a black enameled backplane glass as the backplane, thereby reducing the cost of the backplane and the production process difficulty, and thus reducing the production cost of the fully black photovoltaic module.

[0024] Please refer to Figure 1 and Figure 2 , a fully black photovoltaic module provided by an embodiment of the present invention includes a backplane 1, a first glue film 2, a battery string layer 3, a second glue film 4 and a front plate 5 which are sequentially stacked; a first highly reflective black film 6 is provided in the gap area 31 between two adjacent battery strings 30 of the battery string layer 3, and each first highly reflective black film 6 covers the corresponding gap area 31; a second highly reflective black film 7 is provided in the peripheral area of the battery string layer 3, and the second highly reflective black film 7 covers the edge area of the first glue film 2.

[0025] An all-black photovoltaic module provided by an embodiment of the present utility model is provided with a first highly reflective black film 6 and a second highly reflective black film 7. The first highly reflective black film 6 is disposed in a gap region 31 between adjacent battery strings 30 of the battery string layer 3. The gap region 31 between adjacent battery strings 30 is covered by the first highly reflective black film 6, so as to block a part of the first adhesive film 2 corresponding to the gap region 31, and make the gap region 31 between adjacent battery strings 30 of the battery string layer 3 also present a black effect, preventing the colors of the first adhesive film 2 and the backplane 1 from affecting the front color of the photovoltaic module. The second highly reflective black film 7 is disposed in the peripheral region of the battery string layer 3. The edge region covering the first adhesive film 2 is covered by the second highly reflective black film 7, so that the peripheral region of the battery string layer 3 also presents an all-black appearance. By using the first highly reflective black film 6 and the second highly reflective black film 7, an all-black effect on the front of the photovoltaic module can be achieved. The backplane 1 of the all-black photovoltaic module can adopt a traditional ordinary backplane or ordinary backplane glass, without using a highly reflective all-black backplane or black enameled backplane glass as the backplane, which can reduce the material cost and processing difficulty, can reduce the cost and process difficulty of the backplane 1, and thus reduce the cost and process difficulty of the all-black photovoltaic module. Optionally, the first highly reflective black film 6 and the second highly reflective black film 7 are fixed by a bonding method, which is convenient for assembly and fixation.

[0026] As an embodiment of the present utility model, the first highly reflective black film 6 and / or the second highly reflective black film 7 partially covers the front or back of adjacent battery strings 30.

[0027] In this embodiment, the two sides of the first highly reflective black film 6 are respectively correspondingly attached to the backs of two adjacent battery strings 30 of the battery string layer 3 (as shown in Figure 1 ), and the first highly reflective black film 6 is adjacent to the first adhesive film 2; alternatively, the two sides of the first highly reflective black film 6 are respectively correspondingly attached to the fronts of two adjacent battery strings 30 of the battery string layer 3 (as shown in Figure 2 ), and the first highly reflective black film 6 is adjacent to the second adhesive film 4; the two sides of the second highly reflective black film 7 can be respectively correspondingly attached to the backs of two adjacent battery strings 30 of the battery string layer 3 (as shown in Figure 1 ), the first highly reflective black film 6 is adjacent to the first adhesive film 2, and the two sides of the second highly reflective black film 7 can also be respectively correspondingly attached to the fronts of two adjacent battery strings 30 of the battery string layer 3 (as shown in Figure 2 ), and the first highly reflective black film 6 is adjacent to the second adhesive film 4.

[0028] As a preferred embodiment of the present utility model, the first highly reflective black film 6 and the second highly reflective black film 7 partially cover the backs of adjacent battery strings 30.

[0029] In this embodiment, the two side edge portions of the first highly reflective black film 6 and the second highly reflective black film 7 cover the back surface of the adjacent battery strings 30, and the first highly reflective black film 6 and the second highly reflective black film 7 are arranged adjacent to the first adhesive film 2, that is, the first highly reflective black film 6 partially covers the back surface of the solar cells of the adjacent battery strings 30, and the second highly reflective black film 7 partially covers the back surface of the solar cells in the edge area of the battery string layer 3. Since both the first highly reflective black film 6 and the second highly reflective black film 7 partially cover the back surface of the battery string layer 3, compared with the way that the first highly reflective black film 6 and the second highly reflective black film 7 partially cover the front surface of the solar cells of the battery string layer 3, it can avoid the shading effect of the first highly reflective black film 6 and the second highly reflective black film 7 on the front surface of the solar cells of the battery string layer 3, reduce the influence on the efficiency of the solar cell, and ensure good power generation efficiency of the photovoltaic module; moreover, it is also convenient for the placement and fixation of the first highly reflective black film 6 and the second highly reflective black film 7, and facilitates the assembly of the photovoltaic module.

[0030] In the embodiment of the present utility model, the battery string layer 3 further includes a bus bar (not shown in the figure) disposed between adjacent battery strings 30 and used for welding adjacent battery strings 30. Among them, the bus bar can be a black bus bar to avoid the influence of the color of the bus bar on the all-black effect of the front surface of the photovoltaic module. Of course, the bus bar can also be disposed on one side close to the back surface of the first highly reflective black film 6, that is, the bus bar is between the first highly reflective black film 6 and the solar cells of the battery string layer 3, and the first highly reflective black film 6 is used to block the bus bar. Of course, a black blocking strip can also be disposed on the side of the bus bar close to the front plate 5 to block the bus bar, and the bus bar can also be hidden, so that the bus bar will not affect the all-black effect of the front surface of the photovoltaic module; in addition, the bus bar can also be directly disposed on the back surface of the solar cells of the battery string layer 3 to achieve hiding, so as to achieve the all-black effect of the front surface of the photovoltaic module.

[0031] As an embodiment of the present utility model, the front plate 5 is a transparent glass, a lightweight transparent composite plate, or a laminated structure formed by laminating a transparent glass and a lightweight transparent composite plate.

[0032] In this embodiment, the front plate 5 can be a transparent glass, or a lightweight transparent composite plate, or a laminated structure formed by laminating a transparent glass and a lightweight transparent composite plate. Preferably, the front plate 5 is one of a transparent glass or a lightweight transparent composite plate, which is beneficial to improving the battery efficiency and reducing the processing difficulty and cost of the front plate 5.

[0033] As an embodiment of the present utility model, the first highly reflective black film 6 and the second highly reflective black film 7 have the same composition.

[0034] In this embodiment, it can be understood that the materials and structures of the first highly reflective black film 6 and the second highly reflective black film 7 are completely the same, which is convenient for the processing and preparation of the first highly reflective black film 6 and the second highly reflective black film 7.

[0035] Please refer to Figure 3 As an embodiment of the present invention, the first high-reflective black film 6 and / or the second high-reflective black film 7 both include a substrate layer 61 , and a high-reflective black functional layer 62 is provided on a side of the substrate layer 61 close to the front plate 5 .

[0036] In this embodiment, the structures of the first high-reflective black film 6 and the second high-reflective black film 7 can be the same or different. Preferably, the structures of the first high-reflective black film 6 and the second high-reflective black film 7 are the same, and both the first high-reflective black film 6 and the second high-reflective black film 7 include a substrate layer 61, and a high-reflective black functional layer 62 is provided on the side of the substrate layer 61 close to the front plate 5. Among them, the substrate layer 61 can be provided with the high-reflective black functional layer 62 only on the side close to the front plate 5, or a high-reflective black film can be provided on the side of the substrate layer 61 away from the front plate 5. The high-reflective black film is used to achieve the high reflective effect of the first high-reflective black film 6 and the second high-reflective black film 7, thereby improving the battery efficiency. The first high-reflective black film 6 covers the gap area between adjacent battery string layers 3, and the second high-reflective black film 7 covers the surrounding area of the battery string layer 3, so that the front of the entire all-black photovoltaic module appears completely black.

[0037] As a preferred embodiment of the present invention, a highly reflective black functional layer 62 is provided on both the side of the substrate layer 61 close to the front plate 5 and the side of the substrate layer 61 away from the front plate 5. The substrate layer 61 serves as a base for the highly reflective black functional layer 62, which achieves a high reflective effect and a black appearance.

[0038] As an embodiment of the present invention, the substrate layer 61 includes one or at least two of a PET layer, a PI layer, and a PE layer stacked together.

[0039] In this embodiment, the substrate layer 61 is composed of a PET layer made of PET material, a PI layer made of PI material, or a PE layer made of PE material, or the substrate layer is composed of at least two of the PET layer, the PI layer, and the PE layer. Specifically, the first high-reflective black film 6 and the second high-reflective black film 7 can be thermally bonded to the battery cells of the battery string layer 3, that is, by heating the first high-reflective black film 6 and the second high-reflective black film 7, thermally bonding them to the battery cells of the battery string layer 3, and then fixing the first high-reflective black film 6 and the second high-reflective black film 7 by lamination. Of course, the first high-reflective black film 6 and the second high-reflective black film 7 can also be bonded to the battery cells of the battery string layer 3 by gluing.

[0040] As an embodiment of the present invention, the high-reflectivity black functional layer 62 is a high-reflectivity black coating layer coated on the substrate layer 61 or a high-reflectivity black film stacked on the substrate layer 61 .

[0041] Specifically, when the high-reflection black functional layer 62 is a high-reflection black coating, the high-reflection black coating is formed on the substrate layer 61 by coating and curing; when the high-reflection black functional layer 62 is a high-reflection black film, the high-reflection black film can be fixed on the substrate layer 61 by means of lamination, bonding, etc. Among them, both the high-reflection black coating and the high-reflection black film adopt existing materials, and the specific materials are not limited.

[0042] For example, the material of the high-reflection black coating includes black functional pigments, achromatic pigments and extender pigments; by weight, the black functional coating layer includes the following components: the curing agent is an isocyanate-based curing agent; the black functional pigment is any one or a mixture of at least two of cobalt black, chromium green black, copper chromium black, manganese iron black, manganese chromium nickel black, titanium iron black, aniline black and perylene black; the achromatic pigment is aniline yellow and / or phthalocyanine blue; the extender pigment is any one or a mixture of at least two of calcium carbonate, montmorillonite, barium sulfate and alumina.

[0043] For example, the high-reflection black film can be a high-reflection black fluorine-containing film, and the black fluorine-containing film is bonded to the substrate layer 61 using an adhesive and prepared by a composite process.

[0044] As an embodiment of the present invention, the width of the second high-reflection black film 7 is greater than the width of the first high-reflection black film 6, which can enable the second high-reflection black film 7 to fully block the edge area of the first adhesive film 2 and reduce the area of the battery cell blocked by the first high-reflection black film 6.

[0045] As an embodiment of the present invention, the width of the first high-reflection black film 6 is d1, 2 mm < d1 < 8 mm, and the width of the second high-reflection black film 7 is d2, 12 mm < d2 < 30 mm.

[0046] In this embodiment, by setting the width of the first high-reflection black film 6 within the above range, the area of the battery cell blocked by both sides of the first high-reflection black film 6 can be reduced, the power influence on the photovoltaic module can be reduced, and it can ensure that the first high-reflection black film 6 is in good contact with the battery cell, so that the first high-reflection black film 6 is stably fixed on the battery cell of the battery string layer 3.

[0047] In this embodiment, by setting the width of the second high-reflection black film 7 within the above range, the coverage area of the second high-reflection black film 7 on the battery cell can be reduced, the power influence on the photovoltaic module can be reduced, and it also enables the second high-reflection black film 7 to be in good contact with the battery cell, so that the second high-reflection black film 7 is stably fixed on the battery cell of the battery string layer 3.

[0048] As an embodiment of the present utility model, the thickness of the first highly reflective black film 6 and / or the thickness of the second highly reflective black film 7 is h1, where 0.05 mm < h1 < 0.8 mm.

[0049] In this embodiment, the thickness of the first highly reflective black film 6 may be equal to or different from the thickness of the second highly reflective black film 7. Preferably, the thickness of the first highly reflective black film 6 is equal to the thickness of the second highly reflective black film 7, which can keep the first highly reflective black film 6 and the second highly reflective black film 7 at the same height after the photovoltaic module is laminated, enabling the photovoltaic module to fit well after lamination and improving the structural stability of the photovoltaic module. Moreover, setting the thickness of the first highly reflective black film 6 and the thickness of the second highly reflective black film 7 within the above range can reduce the influence of the thickness of the first highly reflective black film 6 and the second highly reflective black film 7 on lamination and facilitate the processing and preparation of the thickness of the first highly reflective black film 6 and the second highly reflective black film 7.

[0050] As an embodiment of the present utility model, the first highly reflective black film 6 and the second highly reflective black film 7 are at the same height along the direction of the battery string 31.

[0051] In this embodiment, after the photovoltaic module is laminated, the first highly reflective black film 6 and the second highly reflective black film 7 are at the same height along the direction of the battery string 31, enabling the photovoltaic module to fit well after lamination and improving the structural stability of the photovoltaic module. As an embodiment of the present utility model, the all-black photovoltaic module is a single-glass photovoltaic module, the second adhesive film 4 is a white adhesive film, and the backsheet 1 is a white ordinary backsheet.

[0052] In this embodiment, the all-black photovoltaic module is a single-glass photovoltaic module, and the white ordinary backsheet is the backsheet glass used in conventional photovoltaic modules, rather than a highly reflective all-black backsheet. Compared with a single-glass photovoltaic module using a highly reflective black backsheet, the all-black photovoltaic module in this embodiment uses a white adhesive film in combination with a white ordinary backsheet, which can improve the back reflection light, increase the module power, and reduce the backsheet cost of the photovoltaic module.

[0053] As an embodiment of the present utility model, the all-black photovoltaic module is a double-glass photovoltaic module, the second adhesive film 4 is a transparent adhesive film, and the backsheet 1 is an ordinary backsheet glass.

[0054] In this embodiment, the ordinary backsheet glass is the backsheet glass used in conventional photovoltaics without a black enamel layer. Compared with a double-glass photovoltaic module using a black enameled backsheet glass, the first highly reflective black film 6 and the second highly reflective black film 7 are used to replace the black enamel layer of the black enameled backsheet glass to reflect sunlight, improving the effective utilization rate of sunlight, saving the cost of glass enameling, and reducing the backsheet cost of the photovoltaic module.

[0055] An embodiment of the present utility model further provides a photovoltaic power generation system, which includes the above-mentioned all-black photovoltaic module. It should be noted that the photovoltaic power generation system and the above-mentioned all-black photovoltaic module have the same or similar beneficial effects, and the relevant parts between the two can be referred to each other. To avoid repetition, it will not be elaborated here.

[0056] An all-black photovoltaic module provided by an embodiment of the present utility model is provided with a first highly reflective black film and a second highly reflective black film. The first highly reflective black film covers the gap area between adjacent battery strings in the battery string layer, so that the gap area between adjacent battery strings presents a black effect. The second highly reflective black film is arranged in the peripheral area of the battery string layer, and the edge area of the first glue film is covered by the second highly reflective black film, so that the peripheral area of the battery string layer also presents a black effect, realizing an all-black effect on the front appearance of the module. The backplane of the all-black photovoltaic module can adopt a common backplane or a common backplane glass, without using a highly reflective all-black backplane or a black enameled backplane glass as the backplane, thereby reducing the cost of the backplane and the production process difficulty, and thus reducing the production cost of the all-black photovoltaic module.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fully black photovoltaic module, characterized in that, It includes a back plate, a first encapsulant film, a battery string layer, a second encapsulant film and a front plate which are sequentially stacked; Wherein, a first highly reflective black film is provided in the gap region between adjacent battery strings of the battery string layer, and each of the first highly reflective black films covers the corresponding gap region; A second highly reflective black film is provided in the peripheral region of the battery string layer, and the second highly reflective black film covers the edge region of the first encapsulant film.

2. The all-black photovoltaic module according to claim 1, wherein The first highly reflective black film and / or the second highly reflective black film partially covers the front or back surface of the adjacent battery strings.

3. The all-black photovoltaic module according to claim 1, wherein The first highly reflective black film and the second highly reflective black film have the same composition.

4. The all-black photovoltaic module according to claim 1, wherein The first highly reflective black film and the second highly reflective black film are at the same height in the direction of the battery strings.

5. The all-black photovoltaic module according to claim 1, wherein The first highly reflective black film and / or the second highly reflective black film includes a substrate layer, and a highly reflective black functional layer is provided on the side of the substrate layer close to the front plate.

6. The all-black photovoltaic module according to claim 5, wherein, The substrate layer is made of one or at least two of PET layer, PI layer, and PE layer laminated together.

7. The all-black photovoltaic module according to claim 5, wherein, The highly reflective black functional layer is a highly reflective black coating applied on the substrate layer or a highly reflective black thin film laminated on the substrate layer.

8. The all-black photovoltaic module according to claim 1, wherein, The width of the second highly reflective black film is greater than the width of the first highly reflective black film.

9. The all-black photovoltaic module according to claim 8, wherein, The width of the first highly reflective black film is d1, where 2mm < d1 < 8mm; the width of the second highly reflective black film is d2, where 12mm < d2 < 30mm.

10. The all-black photovoltaic module according to claim 1, wherein, The thickness of the first highly reflective black film and / or the second highly reflective black film is h1, where 0.05mm < h1 < 0.8mm.

11. A photovoltaic power generation system, characterized in that, It includes a full-black photovoltaic module according to any one of claims 1 to 10.

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