Photovoltaic device

Abstract

The photovoltaic device comprises a front plate, a power generation layer, a rear plate and a covering part, the power generation layer comprises a plurality of battery pieces and at least one current transmission part, the battery pieces are attached to the front plate and arranged at intervals, each battery piece comprises an electrode, and the current transmission part is electrically connected with the electrode and located on the side, away from the front plate, of each battery piece; the current transmission part is attached to the rear plate, the covering part is located between the front plate and the rear plate, and the covering part is located on the side, close to the front plate, of the current transmission part and covers the current transmission part. The plurality of battery pieces of the power generation layer can be used for receiving light and converting light energy into electric energy. The current is gathered through the current transmission piece and transmitted to other devices, and the covering piece can shield the current transmission piece and prevent the current transmission piece from being directly exposed to the outside. Therefore, sunlight can be prevented from directly irradiating the current transmission piece, and the service life of the current transmission piece can be prolonged. In addition, the covering piece and the battery layer have appearance consistency, and attractiveness of the photovoltaic device is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic equipment, and in particular to a photovoltaic device. Background Art

[0002] As traditional fossil energy causes greenhouse effect and other issues, the call for low-carbon and environmental protection is becoming stronger. In this context, the pursuit of clean energy is gradually increasing. Compared with traditional fossil energy, solar energy, as a high-quality clean energy, is favored by people because it is easy to obtain and does not produce pollutants.

[0003] Existing photovoltaic devices are made up of multiple cells, which need to be electrically connected through electrical connectors such as cables. However, due to factors such as ensuring the light-receiving area of ​​the cell and its heat dissipation, multiple cells are difficult to stack on top of each other, and there may be a certain installation gap between two cells. The electrical connector may be arranged in the installation gap, and sunlight may pass through the gap and directly shine on the electrical connector, which may age. In addition, the electrical connector is directly exposed to the outside world, which reduces the appearance consistency of the photovoltaic device and affects the appearance of the photovoltaic device. Utility Model Content

[0004] The embodiments of the present application provide a photovoltaic device to at least partially improve the above technical problems.

[0005] An embodiment of the present application provides a photovoltaic device, including a front panel, a power generation layer, a rear panel and a cover member, the power generation layer includes a plurality of battery cells and at least one current transmission member, the plurality of battery cells are attached to the front panel and arranged at intervals, the battery cells include electrodes, the current transmission member is electrically connected to the electrodes and is located on a side of the battery cells away from the front panel, the current transmission member is attached to the rear panel, the cover member is located between the front panel and the rear panel, the cover member is located on a side of the current transmission member close to the front panel and covers the current transmission member.

[0006] In one embodiment, the current transmission member is attached to the surface of the battery cell close to the back plate, and the current transmission member includes a plurality of first transmission members and a second transmission member, each first transmission member is electrically connected between two adjacent battery cells to form a plurality of branches, one end of the second transmission member is electrically connected to the plurality of branches, and the other end is used to electrically connect to an energy storage device.

[0007] In one embodiment, the covering member includes a first covering member, which is disposed between two adjacent battery cells and covers the first transmission member.

[0008] In one embodiment, the covering member includes a first covering member, which is disposed between the front plate and the plurality of battery cells and covers the first transmission member.

[0009] In one embodiment, the first covering member overlaps two adjacent battery cells and covers the first transmission member.

[0010] In one embodiment, the covering member further includes a second covering member, and the second covering member covers the second transmission member.

[0011] In one embodiment, the thickness of the covering member is 0.5 mm-2 mm.

[0012] In one embodiment, the photovoltaic device is configured as an arc-shaped structure.

[0013] In one embodiment, the front plate and / or the back plate is a glass plate, a polyester fiber plate or a polycarbonate plate.

[0014] In one embodiment, the photovoltaic device further includes a first adhesive layer and a second adhesive layer, the first adhesive layer is bonded between the front plate and the power generation layer, and the second adhesive layer is bonded between the rear plate and the power generation layer.

[0015] The embodiment of the present application provides a photovoltaic device, in which the front plate and the rear plate are respectively attached to the opposite sides of the power generation layer, thereby improving the protection performance of the power generation layer and increasing the service life of the photovoltaic device. The multiple battery cells of the power generation layer can be used to receive light and convert light energy into electrical energy. The current is then gathered through the current transmission component and transmitted to other devices. The cover can shield the current transmission component to prevent the current transmission component from being directly exposed to the outside world. In addition, direct sunlight exposure to the current transmission component can be avoided, which can increase the service life of the current transmission component. In addition, the cover can have an appearance consistent with the battery layer to ensure the aesthetics of the photovoltaic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of a photovoltaic device proposed in an embodiment of the present application;

[0018] Figure 2 An exploded schematic diagram of a photovoltaic device proposed in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the structure of a power generation layer and a cover member proposed in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the structure of a power generation layer from another perspective proposed in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the structure of a power generation layer and a rear plate proposed in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of a cover member and a front plate proposed in an embodiment of the present application;

[0023] Figure 7 This is a schematic structural diagram of another power generation layer and cover member proposed in an embodiment of the present application.

[0024] Figure numerals: photovoltaic device 100, front panel 10, power generation layer 20, battery cell 21, electrode 211, light-receiving surface 212, backlight surface 213, current transmission component 22, first transmission component 221, second transmission component 222, back panel 30, cover component 40, first cover component 41, second cover component 42, first adhesive layer 50, second adhesive layer 60. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the present application, not all the implementation modes. Based on the implementation mode in the present application, all other implementation modes obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0026] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" and the like 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, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as specific or special structures. The descriptions of the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0028] Example

[0029] The present application embodiment provides a photovoltaic device 100, see Figure 1 , Figure 2 as well as Figure 3 The photovoltaic device 100 may include a front plate 10, a power generation layer 20, a rear plate 30 and a cover 40. The power generation layer 20 may be used to receive sunlight and convert light energy into electrical energy. The power generation layer 20 is disposed between the front plate 10 and the rear plate 30, that is, the front plate 10 and the rear plate 30 may be respectively attached to the opposite sides of the power generation layer 20. Further, the front plate 10 and the rear plate 30 may be connected to the power generation layer 20 as a whole by bonding with an adhesive layer, etc., to further improve the protection performance of the power generation layer 20 and ensure the service life of the photovoltaic device 100. The power generation layer 20 may include a plurality of battery cells 21, and the cover 40 is disposed between the plurality of battery cells 21. The cover 40 may cover the gaps between the plurality of battery cells 21 to avoid exposure of internal devices or cables, etc., and improve the aesthetics of the photovoltaic device 100. In addition, the internal devices and cables cannot be directly exposed to sunlight, which can prevent the internal devices and cables from aging due to light exposure, and improve the service life of the photovoltaic device 100.

[0030] In this example, see Figure 1 as well as Figure 2 The photovoltaic device 100 can be configured as an arc structure, which can improve the strength and stability of the photovoltaic device 100 and enable the photovoltaic device 100 to adapt to the installation environment, such as a tile roof. The tiles on the roof are also in an arc structure. The photovoltaic device 100 of the same structure can be overlapped with the tiles to facilitate the connection between the two. In addition, the two have the same structure, which can make the photovoltaic device 100 more beautiful in terms of integrity.

[0031] In one embodiment, the front plate 10 may be a hard structure, and the hard structure of the front plate 10 may protect the power generation layer 20, etc. The front plate 10 may be a transparent plate, that is, the front plate 10 may be composed of a transparent material, for example, the front plate 10 may be a glass plate, a polyester fiber plate or a polycarbonate plate, etc. It can ensure that light can be transmitted smoothly through the front plate 10 to the power generation layer 20, and the use effect of the photovoltaic device 100 can also be ensured. The rear plate 30 may be a glass plate, a polyester fiber plate, a polycarbonate plate, a nylon plate, or a metal plate. In addition, the rear plate 30 may also be blackened, and the blackened rear plate 30 may prevent light from being transmitted from the rear plate 30, and avoid the current transmission layer and other wires disposed on one side of the rear plate 30 from aging due to light, thereby improving the service life of the photovoltaic device 100. Preferably, the surface of the front plate 10 away from the power generation layer 20 may be coated with an anti-reflection coating to reduce the reflection of sunlight on the surface to improve the absorption efficiency of sunlight.

[0032] See also Figure 2 The photovoltaic device 100 may also include a first adhesive layer 50 and a second adhesive layer 60. The first adhesive layer 50 may be a polyolefin (POE) layer or an ethylene-vinyl acetate copolymer layer, etc., and the second adhesive layer 60 may also be a polyolefin layer or an ethylene-vinyl acetate copolymer layer, etc. Due to factors such as implementation requirements, the materials, dimensions, etc. of the first adhesive layer 50 and the second adhesive layer 60 may be the same or different. The polyolefin layer has high low temperature resistance, high chemical stability, high oil resistance and weather resistance, and is easy to be processed into various shapes and sizes. The polyolefin layer can improve the protection ability of the photovoltaic device 100 and prevent water vapor from entering from the gap between two adjacent layers. The ethylene-vinyl acetate copolymer layer has good softness, elasticity and low temperature resistance, and has good chemical stability and weather resistance. The ethylene-vinyl acetate copolymer layer also has good processing performance and is easy to hot-melt connect and solvent bond. It is selected and designed according to the specific implementation scenario and use requirements, and this embodiment does not limit it. The first adhesive layer 50 is connected between the front plate 10 and the power generation layer 20. The first adhesive layer 50 can be melted by heat, and when solidified later, the front plate 10 and the power generation layer 20 can be connected to each other so that the front plate 10 and the power generation layer 20 are integrated. The second adhesive layer 60 is connected between the rear plate 30 and the power generation layer 20. The second adhesive layer 60 can be melted by heat, and when solidified later, the rear plate 30 and the power generation layer 20 can be connected to each other so that the rear plate 30 and the power generation layer 20 are integrated. The integrity of the photovoltaic device 100 is ensured, and the protection capability and use safety of the photovoltaic device 100 are improved.

[0033] It is understandable that the second adhesive layer 60 may also be blackened to further prevent external light from penetrating the second adhesive layer 60 , thereby protecting the current transmission layer and internal cables and increasing the service life of the photovoltaic device 100 .

[0034] In this example, see Figure 3 as well as Figure 4 The power generation layer 20 may include a plurality of cells 21 and at least one current transmission member 22, and the plurality of cells 21 are attached to the surface of the front plate 10 close to the rear plate 30. The number of cells 21 may be 1, 2, 3, ..., or even more, which is not limited by the present embodiment and may be arranged according to the size of the specific photovoltaic device 100 and the size and arrangement of the cells 21. Exemplarily, the plurality of cells 21 may be arranged at intervals, and the plurality of cells 21 may be distributed in sequence along two mutually perpendicular directions to form a photovoltaic matrix. Moreover, when a single cell 21 fails, the failed cell 21 may be replaced. There is no need to replace the entire power generation layer 20, which saves the maintenance cost of the power generation layer 20 and improves the maintenance efficiency.

[0035] The cell 21 may include an electrode 211. In one embodiment, the electrode 211 may include a first electrode and a second electrode. The first electrode may be electrically connected to the positive electrode of the cell 21, and the second electrode may be electrically connected to the positive electrode of the cell 21. The selection and design of the electrode 211 may be performed according to the structure of the cell 21, etc., and this embodiment is not limited thereto. The cell 21 includes a light-receiving surface 212 and a backlight surface 213 opposite to each other, and the light-receiving surface 212 is attached to the front plate 10. Sunlight may be transmitted through the front plate 10, the light-receiving surface 212 may capture the sunlight and convert it into electrical energy, and the backlight surface 213 may be attached to the back plate 30. The current transmission member 22 is located on the side of the cell 21 away from the front plate 10, that is, the current transmission member 22 is placed on the side of the backlight surface 213 of the cell 21. The current transmission member 22 can be prevented from shielding the surface of the cell 21 close to the front plate 10, that is, the current transmission member 22 can be prevented from shielding the light-receiving surface 212 of the cell 21, thereby ensuring the light-receiving area of ​​the cell 21 and improving the conversion efficiency of the photovoltaic device 100. The current needs to flow through the current transmission member 22, and the current transmission member 22 can be attached to the rear plate 30, and the rear plate 30 can be insulated to prevent users or other devices from directly contacting the current transmission member 22, thereby improving the safety of the photovoltaic device 100.

[0036] Please continue reading Figure 4, the current transmission member 22 is connected to the electrode 211. Further, the current transmission member 22 can be connected to the electrode 211 by welding, conductive adhesive bonding or direct physical contact. The end of the current transmission member 22 away from the electrode 211 can extend in the direction outside the photovoltaic device 100, and can be electrically connected to an energy storage device, an electrical device, etc. The current can be gathered and / or transmitted to other devices through the current transmission member 22 for use by other devices. Further, the photovoltaic device 100 can also include an interface, etc., and the end of the current transmission member 22 away from the battery cell 21 is electrically connected to the interface, and the interface can be electrically connected to other devices, thereby increasing the connection firmness between the photovoltaic device 100 and other devices. Preferably, the current transmission member 22 can be arranged between the battery cell 21 and the back plate 30. The current transmission member 22 can be made of a metal member, which is conductive and has a certain strength. It can help the power generation layer 20 resist bending and ensure the structural strength of the power generation layer 20.

[0037] In a more specific implementation, please continue to refer to Figure 4 The current transmission element 22 can be attached to the surface of the battery cell 21 close to the rear plate 30, and the sunlight can be transmitted from the front plate 10 to the battery cell 21. The battery cell 21 in this embodiment can block at least a portion of the current transmission element 22, thereby preventing the sunlight from directly shining on the current transmission element 22, thereby preventing the current transmission element 22 from aging due to light, and improving the service life of the current transmission element 22.

[0038] See also Figure 3 , the current transmission member 22 may include a plurality of first transmission members 221 and a second transmission member 222. The sizes and structures of the first transmission member 221 and the second transmission member 222 may be the same or different, and may be set according to factors such as the specific implementation scenario and the load voltage size, and this embodiment does not limit this. Each first transmission member 221 is electrically connected between two adjacent battery cells 21, and the two adjacent battery cells 21 can be set in series or in parallel through the first transmission member 221. The plurality of first transmission members 221 are respectively electrically connected to the plurality of battery cells 21, thereby forming a plurality of branches 23. One end of the second transmission member 222 is electrically connected to the plurality of branches 23, and the currents of the plurality of branches 23 can be gathered at one place through the second transmission member 222. The other end of the second transmission member 222 can be electrically connected to an energy storage device, and the current generated by the photovoltaic device 100 can be transmitted to the energy storage device for storage by the energy storage device.

[0039] In another embodiment, the end of the second transmission member 222 away from the solar cell 21 can also be electrically connected to an electrical device, so that the current generated by the photovoltaic device 100 can directly power the electrical device, reducing the loss generated during the current transmission process.

[0040] In this example, see Figure 2 as well as Figure 3 , the cover 40 can be located between the front plate 10 and the rear plate 30, and the front plate 10 and the rear plate 30 can improve the protective performance of the cover 40 and ensure the structural stability of the photovoltaic device 100. The cover 40 can be located on the side of the current transmission member 22 close to the front plate 10, and the cover 40 can cover the current transmission member 22. It is difficult for sunlight to penetrate the cover 40, which can prevent the current transmission member 22 from being directly exposed to sunlight, prevent the current transmission member 22 from aging due to light, and ensure the service life of the current transmission member 22. It can also prevent the current transmission member 22 from being exposed to the user's field of vision, ensuring the aesthetics of the photovoltaic device 100. In addition, the cover 40 and the battery cell 21 can be configured in the same color to further improve the appearance consistency of the photovoltaic device 100.

[0041] Preferably, the thickness of the cover 40 can be 0.5 mm-2 mm, which can prevent the cover 40 from being too thick and ensure the connectivity between the front plate 10 and the battery layer or the battery layer and the rear plate 30, and prevent the cover 40 from being too thin and ensure the covering effect of the cover 40.

[0042] In one embodiment, see Figure 3 , the cover 40 may include a first cover 41, and the first cover 41 is arranged between two adjacent battery cells 21. The first cover 41 may be arranged to be opaque, for example, the first cover 41 may be formed by spraying ink between two adjacent battery cells 21, and the size of the first cover 41 may be equal to or greater than the spacing between the two adjacent battery cells 21, so that the first cover 41 can completely cover the gap between the two adjacent battery cells 21. The first cover 41 can be arranged corresponding to the first transmission member 221, and then the first cover 41 can cover the first transmission member 221, and the first cover 41 can block the first transmission member 221 to prevent the first transmission member 221 from being directly exposed to the outside world. In this way, direct sunlight exposure to the first transmission member 221 can be avoided, and the service life and stability of the first transmission member 221 can be improved.

[0043] In another embodiment, see Figure 5 as well as Figure 6 , the cover 40 may include a first cover 41, and the first cover 41 may be arranged to be opaque. The first cover 41 is arranged between the front plate 10 and the plurality of cells 21 and covers the first transmission member 221. The first cover 41 may be formed by screen printing, printing ink or coating on the surface of the front plate 10 close to the plurality of cells 21, and the first cover 41 may be integrated with the front plate 10. It can ensure that the first cover 41 can completely cover the first transmission member 221, and the connection firmness between the first cover 41 and the front plate 10 can be ensured, further ensuring the structural performance of the photovoltaic device 100 and the consistency of the appearance of the photovoltaic device 100.

[0044] In another embodiment, see Figure 7 , the first covering member 41 overlaps the two adjacent battery cells 21 and covers the first transmission member 221. The first covering member 41 can be a polyethylene terephthalate (PET) or ethylene vinyl acetate (EVA) layer, etc. The first covering member 41 can overlap the two ends of the two battery cells 21 and cover the first transmission member 221 between the two adjacent battery cells 21, which can ensure that the first covering member 41 can completely cover the first transmission member 221, ensure the service life of the first transmission member 221 and the appearance consistency of the photovoltaic device 100.

[0045] In this example, see Figure 3 , the cover member 40 may further include a second cover member 42, and the second cover member 42 may be arranged opposite to the second transmission member 222. Compared with the first transmission member 221, the second transmission member 222 has a larger internal current, so the size of the second transmission member 222 may be set larger. Relative to the first cover member 41, the size of the second cover member 42 may also be set larger so that the second cover member 42 can completely cover the second transmission member 222. This can ensure that the second cover member 42 can cover the second transmission member 222, ensure the service life of the second transmission member 222, and ensure the appearance consistency of the photovoltaic device 100.

[0046] The embodiment of the present application provides a photovoltaic device 100, in which the front plate 10 and the rear plate 30 are respectively attached to the opposite sides of the power generation layer 20, thereby improving the protection performance of the power generation layer 20 and improving the service life of the photovoltaic device 100. The multiple battery cells 21 of the power generation layer 20 can be used to receive light and convert light energy into electrical energy. The current is then gathered through the current transmission component 22 and transmitted to other devices. The cover 40 can shield the current transmission component 22 to prevent the current transmission component 22 from being directly exposed to the outside world. In addition, direct sunlight exposure to the current transmission component 22 can be avoided, and the service life of the current transmission component 22 can be improved. In addition, the cover 40 can have an appearance consistent with the battery layer to ensure the aesthetics of the photovoltaic device 100.

[0047] The above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present application, and should all be included in the protection scope of the present application.

Claims

1. A photovoltaic device, characterized in that: include: front panel; A power generation layer, the power generation layer comprising a plurality of battery cells and at least one current transmission member, the plurality of battery cells are attached to the front plate and arranged at intervals, the battery cells comprise electrodes, the current transmission member is electrically connected to the electrodes and is located on a side of the battery cells away from the front plate; a rear plate, the current transmission member being attached to the rear plate; as well as A covering member is located between the front plate and the rear plate, and the covering member is located on a side of the current transmission member close to the front plate and covers the current transmission member.

2. The photovoltaic device according to claim 1, characterized in that: The current transmission component is attached to the surface of the battery cell close to the back plate, and includes a plurality of first transmission components and a second transmission component. Each of the first transmission components is electrically connected between two adjacent battery cells to form a plurality of branches. One end of the second transmission component is electrically connected to the plurality of branches, and the other end is used to electrically connect to an energy storage device.

3. The photovoltaic device according to claim 2, characterized in that: The covering member includes a first covering member, and the first covering member is disposed between two adjacent battery sheets and covers the first transmission member.

4. The photovoltaic device according to claim 2, characterized in that: The covering member includes a first covering member, which is disposed between the front plate and the plurality of battery cells and covers the first transmission member.

5. The photovoltaic device according to claim 4, characterized in that: The first covering member overlaps two adjacent battery sheets and covers the first transmission member.

6. The photovoltaic device according to any one of claims 3 to 5, characterized in that: The covering member further includes a second covering member, and the second covering member covers the second transmission member.

7. The photovoltaic device according to claim 6, characterized in that: The thickness of the covering member is 0.5 mm-2 mm.

8. The photovoltaic device according to claim 1, characterized in that: The photovoltaic device is configured as an arc-shaped structure.

9. The photovoltaic device according to claim 8, characterized in that: The front plate and / or the rear plate is a glass plate, a polyester fiber plate or a polycarbonate plate.

10. The photovoltaic device according to claim 1, characterized in that: The photovoltaic device further includes a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is bonded between the front plate and the power generation layer, and the second adhesive layer is bonded between the rear plate and the power generation layer.

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