Curved surface photovoltaic member and photovoltaic building surface

Abstract

A curved photovoltaic member (100), comprising a battery piece (50), a front plate (10), a conductive layer (60), and a back plate (90). The front plate (10) is located on the side of a light receiving surface (51) of the battery piece (50). The conductive layer (60) is electrically connected to the battery piece (50), and the conductive layer (60) is located on the side of a backlight surface (53) of the battery piece (50). The back plate (90) is located on the side of the conductive layer (60) away from the battery piece (50).

Description

Curved photovoltaic components and photovoltaic building surfaces

[0001] Priority information

[0002] This application claims priority and benefits of patent application No. 202311518157.9 filed with the State Intellectual Property Office of China on November 14, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of photovoltaic technology, and more specifically, to a curved photovoltaic component and a photovoltaic building surface. Background Art

[0004] Curved photovoltaic tiles were developed to complement traditional building tiles. Initially, these tiles were based on flexible copper indium gallium selenide (CIGS) cells. While these cells offer significant flexibility, they only have a power generation efficiency of 12%-14%, resulting in high costs. To improve efficiency and reduce costs, most current curved photovoltaic tiles utilize crystalline silicon cells, which offer higher photoelectric conversion efficiencies. However, due to the brittleness of crystalline silicon cells, which easily break when bent under stress, the ratio of the arc length of the curved segment to the corresponding chord length of the current curved photovoltaic tiles is small, resulting in a smaller curvature and poor fit between the tiles and the building.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a curved photovoltaic element and a photovoltaic building surface, which are at least used to solve the problem that the curved photovoltaic element has a small surface curvature and the fit between the curved photovoltaic element and the building is not high.

[0007] The curved photovoltaic device according to the present embodiment includes a solar cell, a front panel, a conductive layer, and a back panel. The solar cell has a light-receiving surface and a back panel facing each other. The front panel is located on one side of the light-receiving surface. The conductive layer is electrically connected to the solar cell and is located on the side of the back panel. The back panel is located on the side of the conductive layer away from the solar cell. The front panel, solar cell, conductive layer, and back panel are stacked in this order.

[0008] In some embodiments, the front plate, the battery cell, and the back plate are all curved surfaces.

[0009] In some embodiments, the bending radius of the battery cell ranges from [25 mm to 200 mm].

[0010] In some embodiments, the longitudinal projection of the curved surface is a curve composed of a curved segment, or the longitudinal projection of the curved surface is a curve composed of multiple curved segments connected in sequence, or the longitudinal projection of the curved surface is an irregular curve composed of curved segments and straight segments, the curved segment is an arc, and the ratio of the arc length of the curved segment to the corresponding chord length is in the range of [1.03, 1.67].

[0011] In certain embodiments, when the longitudinal projection of the curved surface is a curve composed of multiple curved segments connected in sequence, the bending directions of the curved segments of two adjacent segments are opposite, and the bending radii of the multiple curved segments are the same; when the longitudinal projection of the curved surface is an irregular curve composed of curved segments and straight segments, the bending directions of the multiple curved segments are the same, and the bending radii of the multiple curved segments are the same.

[0012] In some embodiments, the battery cell has a positive electrode and a negative electrode, both the positive electrode and the negative electrode are arranged on the backlight surface, and the conductive layer connects the positive electrodes and negative electrodes of adjacent battery cells.

[0013] In some embodiments, the battery cell is a whole battery cell or the battery cell is a multi-slice battery cell corresponding to a whole battery cell.

[0014] In some embodiments, there are gaps between the plurality of solar cells, and the curved photovoltaic device further includes a shielding member, which is disposed on the light-receiving surfaces of two adjacent solar cells and shields the gaps.

[0015] In some embodiments, two adjacent battery cells are seamlessly spliced.

[0016] In some embodiments, one light-receiving surface and the other backlight surface of two adjacent battery cells are seamlessly overlapped.

[0017] In some embodiments, the curved photovoltaic device further includes a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is used to connect the front panel and the cell, and the second adhesive layer is used to connect the cell, the conductive layer and the back panel.

[0018] In certain embodiments, the conductive layer is black.

[0019] The photovoltaic building surface of the embodiment of the present application includes a plurality of curved photovoltaic elements described in any of the above embodiments, and adjacent curved photovoltaic elements are connected to each other.

[0020] In the curved photovoltaic device of the present embodiment, the conductive layer is only provided on the backlight side, while no conductive layer is provided on the light-receiving side. This results in a larger contact area between the light-receiving side and the light, allowing the cells to utilize light more efficiently, resulting in higher power generation efficiency. Furthermore, because the conductive layer is provided on the same side of the cell, the cell as a whole can bend to a greater degree, and the curved photovoltaic device also has a greater curvature. Compared to existing curved photovoltaic devices, the curved photovoltaic device of the present embodiment has a greater curvature, allowing for better conformity to buildings.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] FIG1 is a schematic structural diagram of a curved photovoltaic device according to some embodiments of the present application;

[0024] FIG2 is a schematic structural diagram of a curved photovoltaic device according to some other embodiments of the present application;

[0025] FIG3 is a schematic structural diagram of a curved photovoltaic device according to some other embodiments of the present application;

[0026] FIG4 is a schematic structural diagram of a cell and a conductive layer in a curved photovoltaic device according to some embodiments of the present application;

[0027] FIG5 is a schematic structural diagram of a cell and a conductive layer in a curved photovoltaic device according to other embodiments of the present application;

[0028] FIG6 is a schematic structural diagram of a cell and a conductive layer in a curved photovoltaic device according to some other embodiments of the present application;

[0029] FIG7 is a schematic structural diagram of a photovoltaic building surface according to certain embodiments of the present application. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] In order to be installed in conjunction with traditional tiles on buildings, curved photovoltaic tiles came into being. The original curved photovoltaic tiles were developed based on flexible copper indium gallium selenide cells. Although copper indium gallium selenide cells have significant flexibility, they only have a power generation efficiency of 12%-14% and are expensive. In order to improve power generation efficiency and reduce costs, most of the current curved photovoltaic tiles use crystalline silicon cells, which have a higher photoelectric conversion efficiency. However, due to the high brittleness of crystalline silicon cells, they are easily broken when bent under force, resulting in a small ratio between the arc length of the curved segment of the current curved photovoltaic tiles and the corresponding chord length, and a small curvature of the curved surface, which results in a low fit between the curved photovoltaic tiles and the building. To solve this problem, the embodiment of the present application provides a curved photovoltaic component 100 (as shown in FIG1 ) and a photovoltaic building surface 1000 (as shown in FIG5 ).

[0037] Referring to Figures 1 and 2 , a curved photovoltaic device 100 according to an embodiment of the present application includes a cell 50, a front panel 10, a conductive layer 60, and a back panel 90. The cell 50 includes a light-receiving surface 51 and a backlight surface 53 that are opposite to each other. The front panel 10 is located on one side of the light-receiving surface 51. The conductive layer 60 is electrically connected to the cell 50 and is located on one side of the backlight surface 53. The back panel 90 is located on the side of the conductive layer 60 that is away from the cell 50. The front panel 10, cell 50, conductive layer 60, and back panel 90 are stacked in this order.

[0038] Specifically, the curved photovoltaic device 100 is used to convert light energy into electricity to power other components and can be used as a structural component of a building. The curved photovoltaic device 100 can be installed on the top or side of a building, generating electricity while also enhancing the building's aesthetics.

[0039] The front panel 10 is a structure used to protect the light-receiving surface 51 of the cell 50. Preferably, the front panel 10 has a high light transmittance, for example, a light transmittance of 70% or greater, so that most or even all light can pass through the front panel 10 and reach the cell 50, thereby enabling the cell 50 to convert the received light energy into electrical energy. For example, the light transmittance of the front panel 10 can be 70%, 73.1%, 75.6%, 77%, 78.5%, 80.3%, 83%, 85.1%, 87.2%, 90.5%, 92.4%, 93.7%, 95.6%, 97.8%, or 100%. The material of the front panel 10 can be, but is not limited to, transparent glass and polycarbonate plastic. When the front panel 10 is made of transparent glass, the light transmittance of the transparent glass front panel 10 can reach 85% to 90%, which is relatively high. Furthermore, the transparent glass front panel 10 is relatively strong, effectively protecting the solar cells 50. When the front panel 10 is made of polycarbonate plastic, the light transmittance of the polycarbonate front panel 10 can reach 89%, which is also relatively high. The polycarbonate front panel 10 has good bending properties and is lightweight, making the curved photovoltaic device 100 lightweight overall and easier to handle and move.

[0040] The back plate 90 is a structure for protecting the backlight surface 53 of the battery cell 50. The battery cell 50 is arranged between the front plate 10 and the back plate 90, and the battery cell 50 is protected by the front plate 10 and the back plate 90. The material of the back plate 90 may be the same as or different from the material of the front plate 10. The material of the back plate 90 may be, but is not limited to, glass or a polymer material, wherein the polymer material includes a composite material of polyethylene terephthalate (PET) and PET. In the case where the material of the back plate 90 is glass, the strength of the back plate 90 is high, and it can better protect the battery cell 50. In the case where the material of the back plate 90 is a polymer material, the weight of the back plate 90 is light and the bending performance is better.

[0041] The cell 50 is a structure for converting light energy into electrical energy. The light-receiving surface 51 of the cell 50 is used to receive light energy and convert it into electrical energy. The conductive layer 60 is welded to the backlight surface 53 of multiple cells 50, and the conductive layer 60 is used to connect the positive and negative electrodes of adjacent cells 50. In addition, the conductive layer 60 is also used to transmit the electrical energy generated in the multiple cells 50 to the circuit so that the curved photovoltaic device 100 can supply power to other components. Preferably, the conductive layer 60 is made of a metal material, and the metal material includes but is not limited to silver and copper. The conductive layer 60 can be a linear or sheet structure. The conductive layer 60 of the embodiment of the present application is black, and the black conductive layer 60 is connected to the backlight surface 53 of the cell 50 so that the curved photovoltaic device 100 can present a uniform black color as a whole, which is more aesthetically pleasing.

[0042] The cell 50 can be a thin-film cell or a crystalline silicon cell. The cell 50 of the present application is a crystalline silicon cell. The cell 50 has a positive electrode and a negative electrode, both of which are located on the backlight surface 53 of the cell 50. Therefore, the conductive layer 60 only needs to be connected to the backlight surface 53 of the cell 50. When the conductive layer 60 is located on the backlight surface 53 of the cell 50, the light-receiving surface 51 of the cell 50 is not blocked by the conductive layer 60, which can enhance the photoelectric conversion efficiency of the cell 50 and improve the appearance of the cell 50.

[0043] The positive and negative electrodes of the cells used in current curved photovoltaic devices are respectively arranged on the light-receiving and backlight-receiving sides of the cells, and the conductive layer thereof needs to span the light-receiving and backlight-receiving sides of the cells. When the cell is bent, the conductive layer tends to pull on the cell, resulting in a smaller curvature of the cell, and may even cause the cell to break. Referring to Figures 1 to 3, in the curved photovoltaic device 100 of the embodiment of the present application, the conductive layer 60 is only arranged on the backlight side 53 of the cell 50. When the cell 50 is bent, the conductive layer 60 does not pull on the cell 50, so that the cell 50 can bend to a larger curvature and the risk of the cell 50 breaking can be reduced.

[0044] In the curved photovoltaic element 100 of the embodiment of the present application, the conductive layer 60 is only provided on the backlight surface 53 of the cell 50, and the light-receiving surface 51 is not provided with the conductive layer 60, so that the contact area between the light-receiving surface 51 and the light is larger, the cell 50 has a higher utilization rate of light, and the curved photovoltaic element 100 has a higher power generation efficiency. In addition, because the conductive layer 60 is provided on the same side of the cell 50, the curvature of the cell 50 as a whole can be larger, and the curvature of the curved photovoltaic element 100 is also larger. Compared with the current curved photovoltaic elements, the curved photovoltaic element 100 of the embodiment of the present application has a larger curvature, the curved photovoltaic element 100 can have a better fit with the building, and the overall aesthetics of the curved photovoltaic element 100 are better.

[0045] The curved photovoltaic device 100 will be further described below with reference to the accompanying drawings.

[0046] Referring to Figure 1 , in some embodiments, the front panel 10, the battery cell 50, and the back panel 90 all have identical curved surfaces. Specifically, the front panel 10, the battery cell 50, the conductive layer 60, and the back panel 90 all have the same curvature, and the same curvature radius. The front panel 10 and the light-receiving surface 51 of the battery cell 50, the conductive layer 60 and the back panel 90 all fully adhere to each other, as do the conductive layer 60 and the back panel 90.

[0047] Please refer to Figure 1. As mentioned above, the front plate 10, the battery cell 50 and the back plate 90 are all curved surfaces of the same shape. In some embodiments, the longitudinal projection of the curved surface is a curve composed of a curved segment, as shown in Figure 2. In this case, the curved photovoltaic component 100 is small in size and light in weight, making it easy to carry. In other embodiments, the longitudinal projection of the curved surface is a curve composed of multiple curved segments connected in sequence, as shown in Figure 1. In this case, the curve composed of multiple curved segments is wavy, and the volume of the curved photovoltaic component 100 is large, making it easier to assemble and install the curved photovoltaic component 100 on a building. In some other embodiments, the longitudinal projection of the curved surface is a special-shaped curve composed of curved segments and straight segments, as shown in Figure 3. In this case, the bending radius of the battery cell 50 is the bending radius of the largest bend in the curved shape, and the special-shaped curve is formed by connecting the curved segments and the straight segments in sequence. The curved photovoltaic component 100 is more beautiful as a whole, and the installation between multiple curved photovoltaic components 100 is more stable.

[0048] Regardless of which of the above embodiments the curve is, the curve segment is an arc, and the ratio of the arc length of the curve segment to the corresponding chord length is in the range of [1.03, 1.67]. For example, the ratio of the arc length of the curve segment to the corresponding chord length can be 1.03, 1.07, 1.11, 1.15, 1.19, 1.23, 1.25, 1.28, 1.31, 1.36, 1.41, 1.45, 1.47, 1.54, 1.58, or 1.67. The curve of the longitudinal projection of the front panel 10 has the same shape as the curve of the longitudinal projection of the battery cell 50, the curve of the longitudinal projection of the conductive layer 60, and the curve of the longitudinal projection of the back panel 90. The ratio of the arc length of the curved segment of the front panel 10 to the corresponding chord length is the same as the ratio of the arc length of the curved segment of the battery cell 50 to the corresponding chord length, the ratio of the arc length of the curved segment of the conductive layer 60 to the corresponding chord length, and the ratio of the arc length of the curved segment of the back panel 90 to the corresponding chord length.

[0049] When the ratio of the arc length of the curved segment to the corresponding chord length is less than 1.03, the curvature of the curved photovoltaic device 100 is not obvious, the fit with the building is not high, and the aesthetics are not good enough. When the ratio of the arc length of the curved segment to the corresponding chord length is greater than 1.67, the curvature of the curved photovoltaic device 100 is too large, which can easily cause the curved photovoltaic device 100 to break. When the ratio of the arc length of the curved segment to the corresponding chord length is [1.03, 1.67], the curvature of the curved photovoltaic device 100 is more obvious, the fit with the building is high, the aesthetics are good, and the curved photovoltaic device 100 is not easy to break.

[0050] Referring to FIG. 1 , in some embodiments, the bending radius of the battery cell 50 ranges from 25 mm to 200 mm. The bending radius of the battery cell 50 refers to the bending radius of each curved segment. The bending radius of the battery cell 50 can be 25 mm, 38.6 mm, 43.7 mm, 50 mm, 63.4 mm, 70.8 mm, 81.3 mm, 98.7 mm, 101 mm, 109.2 mm, 112.5 mm, 120.9 mm, 136.7 mm, 162.1 mm, or 200 mm, among others.

[0051] Specifically, when the bending radius of the cell 50 is less than 25 mm, the cell 50 is prone to the risk of breaking. When the bending radius of the cell 50 is greater than 200 mm, the curvature of the cell 50 is not obvious enough, the aesthetics are not good enough, and the fit with the building is not high. When the bending radius of the cell 50 is in the range of [25 mm, 200 mm], the curvature of the cell 50 is more obvious, the aesthetics are better, the fit with the building is high, and the cell 50 is not easy to break.

[0052] Continuing with FIG1 , in some embodiments, when the longitudinal projection of the curved surface is a curve composed of multiple sequentially connected curved segments, the curvature directions of two adjacent curved segments are opposite, and the curvature radii of the multiple curved segments are the same. For example, when the first curved segment of the curved photovoltaic device 100 is similar to a parabola with an upward opening (the middle portion of the curved segment is concave downward), the second curved segment adjacent to the first curved segment is similar to a parabola with an upward opening (the middle portion of the curved segment is convex upward), the third curved segment adjacent to the second curved segment is similar to a parabola with an upward opening (the middle portion of the curved segment is concave downward), and the fourth curved segment adjacent to the third curved segment is similar to a parabola with an downward opening (the middle portion of the curved segment is convex upward), and so on, the shape of the curve composed of the multiple curved segments is wavy. Each curved segment has the same bending radius. For example, if the bending radius of the first curved segment is 70.8 mm, the bending radius of the second, third, and remaining curved segments is also 70.8 mm. Alternatively, if the bending radius of the first curved segment is 120 mm, the bending radius of the second, third, and remaining curved segments is also 120 mm.

[0053] Referring to Figure 3 , in other embodiments, when the longitudinal projection of the curved surface is a shaped curve composed of curved segments and straight segments, the multiple curved segments have the same curvature direction and the same curvature radius. For example, the multiple curved segments may each be shaped like a downward-opening parabola (with the center of the curved segment convex upward), with adjacent curved segments connected by a straight segment. The curvature radius of the multiple curved segments may be, but is not limited to, 63.4 mm, 70.8 mm, 76.8 mm, 81.3 mm, 83.5 mm, or 91.6 mm.

[0054] Referring to FIG. 1 , in certain embodiments, the thickness of the battery cell 50 ranges from 20 μm to 190 μm. For example, the thickness of the battery cell 50 may be 20 μm, 41.6 μm, 50.7 μm, 65.1 μm, 73 μm, 96.2 μm, 105.3 μm, 115 μm, 126.4 μm, 142.8 μm, 151.3 μm, 165.4 μm, 174 μm, 187.1 μm, or 190 μm. The thinner the battery cell 50, the better the bending performance of the battery cell 50. Currently, the thinnest battery cell 50 achievable in the industry is 20 μm. If the thickness of the battery cell 50 is greater than 190 μm, the battery cell 50 is too thick and the bending performance is not good enough. Therefore, when the thickness of the battery cell 50 is in the range of [20 μm, 190 μm], the battery cell 50 is thinner and has better bending performance.

[0055] Referring to FIG. 1 , in some embodiments, each battery cell 50 is a whole battery cell 50 , or each battery cell 50 is a battery cell 50 corresponding to a whole cell and multiple slices thereof.

[0056] Specifically, in one embodiment, the battery cells 50 are all whole-piece battery cells 50. In this case, the processing of the battery cells 50 is relatively simple. In another embodiment, the battery cells 50 are all whole-piece corresponding to multi-slice battery cells 50. Specifically, one battery cell 50 is composed of multiple slices. In this case, the battery cell 50 can achieve a larger bending curvature. For example, the battery cell 50 can be a two-slice battery cell 50 corresponding to the whole piece (1 / 2 slice battery: composed of 2 slices), the battery cell 50 can also be a three-slice battery cell 50 corresponding to the whole piece (1 / 3 slice battery: composed of 3 slices), the battery cell 50 can also be a four-slice battery cell 50 corresponding to the whole piece (1 / 4 slice: composed of 4 slices), the five-slice battery cell 50 corresponding to the whole piece (1 / 5 slice: composed of 5 slices), and the six-slice battery corresponding to the whole piece (1 / 6 slice: composed of 6 slices), etc. When a curved segment corresponds to a battery cell 50, if the battery cell 50 is processed into 1 / 2 slices, the two-sliced ​​battery cell 50 can achieve a larger curvature than a whole battery cell 50. Furthermore, the more slices a battery cell 50 corresponds to, the greater the curvature the battery cell 50 can achieve. In one example, the multiple battery cells 50 all have the same number of slices. For example, the multiple battery cells 50 all have 1 / 2 slices, or the multiple battery cells 50 all have 1 / 3 slices, or the multiple battery cells 50 all have 1 / 4 slices, etc. In another example, the multiple battery cells 50 can have different numbers of slices. For example, some battery cells 50 can have 1 / 2 slices, and some can have 1 / 4 slices. Alternatively, some can have 1 / 3 slices, and some can have 1 / 6 slices, etc.

[0057] Referring to Figures 4 to 6 , the arrangement of the plurality of battery cells 50 can be: the plurality of battery cells 50 are arranged in sequence with gaps between adjacent battery cells 50; or the plurality of battery cells 50 are arranged in sequence with no gaps between adjacent battery cells 50. In some embodiments, there are gaps between adjacent battery cells 50 (as shown in Figure 4 ). When the light-receiving surface 51 has gaps between adjacent battery cells 50, the curvature of the battery cell 50 can be larger and the bending radius of the battery cell 50 can be smaller. When the bending radius of the battery cell 50 is smaller, the presence of gaps between adjacent battery cells 50 prevents interference between adjacent battery cells 50, which can lead to the problem of battery cell 50 being broken.

[0058] Among them, since the conductive layer 60 is welded to the backlight surface 53 of multiple battery cells 50, when there is a gap between adjacent battery cells 50, the welding strip will be exposed from the gap, resulting in uneven color of the entire battery cell 50 and poor aesthetics. In one example, the curved photovoltaic device 100 may also include a shielding member 55, which is arranged on the light-receiving surface 51 of two adjacent battery cells 50 and blocks the gap. The shielding member 55 is used to block the welding strip used to weld the conductive layer 60 to the backlight surface 53 at the gap, so that all the battery cells 50 appear uniformly black as a whole and are more beautiful as a whole. Preferably, the side of the shielding member 55 away from the light-receiving surface 51 of the battery cell 50 is black, and the shielding member 55 can be made of a soft material so that when the battery cell 50 is bent, the shielding member 55 can also be deformed accordingly, which can avoid interference with the battery cell 50 and the problem of the battery cell 50 being broken. For example, the shielding member 55 can be a black tape. When the interval between adjacent solar cells 50 is 5 mm, the width of the shielding member 55 needs to be greater than 5 mm. For example, the width of the shielding member 55 can be 10 mm. When the width of the shielding member 55 is greater than the width of the interval, the shielding member 55 can cover the welding ribbon while being firmly connected to the two solar cells 50, thereby avoiding the problem of the shielding member 55 falling off due to unstable adhesion between the shielding member 55 and the solar cell 50. Of course, in other examples, the curved photovoltaic device 100 may not include the shielding member 55. In another example, the welding ribbon exposed between adjacent solar cells 50 is covered by black silk screen printing, so that all solar cells 50 appear uniformly black as a whole, and the overall appearance is more beautiful. In another example, the curved photovoltaic device 100 can also use black welding ribbon. When there is a gap between adjacent solar cells 50, the black welding ribbon is exposed from the gap, so that all solar cells 50 appear uniformly black as a whole, and the overall appearance is more beautiful.

[0059] In other embodiments, there is no gap between adjacent battery cells 50 (as shown in Figures 5 and 6). In the case where there is no gap between adjacent battery cells 50, there is no need to set the shielding member 55 shown in Figure 2 between the battery cells 50, which can save materials and the processing technology of the product is relatively simple. In addition, since there is no shielding member 55 shown in Figure 2 to block part of the area of ​​the light-receiving surface 51 of the battery cell 50, the area of ​​the light-receiving surface 51 of the battery cell 50 in this embodiment that is in contact with light is larger, the photoelectric conversion rate of the battery cell 50 is higher, and the power generation loss of the battery cell 50 is less. In one example, two adjacent battery cells 50 are seamlessly spliced ​​(as shown in Figure 5). In another example, the light-receiving surface 51 of one battery cell 50 and the backlight surface 53 of the other battery cell 50 of two adjacent battery cells 50 are seamlessly overlapped (as shown in Figure 6). Preferably, the value range of the overlap width of the light-receiving surface 51 of one battery cell 50 and the backlight surface 53 of the other battery cell 50 can be (0mm, 1mm], For example, the overlap width of the light-receiving surface 51 of one cell 50 and the backlight surface 53 of another cell 50 may be 0.11 mm, 0.23 mm, 0.35 mm, 0.4 mm, 0.51 mm, 0.67 mm, 0.74 mm, 0.8 mm, 0.91 mm, or 1 mm. When the overlap width of the light-receiving surface 51 of one cell 50 and the backlight surface 53 of another cell 50 is greater than 1 mm, the width of the light-receiving surface 51 of one cell 50 blocked by the other cell 50 is large, thereby causing a large loss in the power generation of the cell 50. When the overlap width of the light-receiving surface 51 of one cell 50 and the backlight surface 53 of another cell 50 is in the range of (0 mm, 1 mm], there is no gap between the two cells 50, and the width of the light-receiving surface 51 of one cell 50 blocked by the other cell 50 is small, thereby causing a small loss in the power generation of the cell 50.

[0060] Referring to FIG. 1 , further, in certain embodiments, the curved photovoltaic device 100 further includes a first adhesive layer 30 and a second adhesive layer 70. The first adhesive layer 30 is used to connect the front panel 10 and the cell 50, and the second adhesive layer 70 is used to connect the cell 50, the conductive layer 60, and the back panel 90. The first adhesive layer 30 is light-transmissive.

[0061] Specifically, the first adhesive layer 30 is used to tightly connect the front panel 10 and the light-receiving surface 51 of the cell 50, and the second adhesive layer 70 is used to tightly connect the backlight surface 53, to which the conductive layer 60 is welded, and the back panel 90. Preferably, the first adhesive layer 30 can be an optically transparent adhesive to minimize light loss through the first adhesive layer 30 as light passes through the front panel 10 and the first adhesive layer 30 to reach the cell 50. For example, the light transmittance of the first adhesive layer 30 is greater than or equal to 70%. The light transmittance of the first adhesive layer 30 can be 70%, 72.5%, 76.8%, 79.4%, 81%, 83.6%, 85.4%, 87.1%, 91.2%, 94.7%, 95.8%, 97.4%, or 100%. The optically transparent adhesive includes, but is not limited to, ethylene vinyl acetate (EVA), polyolefin (POE), polyvinyl butyral (PVB), silica gel, and the like.

[0062] In one embodiment, the second adhesive layer 70 is opaque and the backplane 90 is translucent. The second adhesive layer 70 can be a black adhesive film or a transparent cut-off adhesive film, wherein the black adhesive film is almost opaque and the light transmittance of the transparent cut-off adhesive film is less than or equal to 30%. The backplane 90 can be translucent glass or made of translucent PET material. Preferably, the second adhesive layer 70 is a black adhesive film, so that the curved photovoltaic component 100 can be uniformly black as a whole, and the aesthetics is better. In another embodiment, the backplane 90 is opaque and the second adhesive layer 70 is translucent. In this case, the backplane 90 can be made of a black material, and the black backplane 90 is almost opaque, and the second adhesive layer 70 can be a translucent adhesive film, so that the curved photovoltaic component 100 can be uniformly black as a whole, and the aesthetics is better. In another embodiment, both the second adhesive layer 70 and the backsheet 90 are opaque. In this case, the second adhesive layer 70 can be a black film or a transparent cut-off film, and the backsheet 90 can be made of a black material, so that the curved photovoltaic device 100 can appear uniformly black as a whole, which improves its aesthetics. In one example, the second adhesive layer 70 is a black film and the backsheet 90 is made of a black material. In another example, the second adhesive layer 70 is a transparent cut-off film and the backsheet 90 is made of a black material. In yet another embodiment, both the second adhesive layer 70 and the backsheet 90 are translucent. In this case, the second adhesive layer 70 can be a transparent film and the backsheet 90 can be made of a transparent material.

[0063] Referring to Figure 7 , a photovoltaic building surface 1000 according to an embodiment of the present application includes multiple curved photovoltaic elements 100 according to any of the aforementioned embodiments, with adjacent curved photovoltaic elements 100 interconnected. When waterproofing a product is required, the overlap area required between adjacent curved photovoltaic elements 100 is smaller compared to flat photovoltaic elements. This allows for a larger area of ​​contact with light, resulting in higher photoelectric conversion efficiency.

[0064] In the curved photovoltaic element 100 of the embodiment of the present application, the conductive layer 60 is only provided on the backlight surface 53 of the cell 50, and the conductive layer 60 is not provided on the light-receiving surface 51. As a result, the contact area between the light-receiving surface 51 and the light is larger, the light utilization rate of the cell 50 is higher, and the power generation efficiency of the curved photovoltaic element 100 is higher. In addition, because the conductive layer 60 is provided on the same side of the cell 50, the curvature of the cell 50 as a whole can be larger, and the curvature of the curved photovoltaic element 100 is also larger. Compared with the current curved photovoltaic elements, the curved photovoltaic element 100 of the embodiment of the present application has a larger curvature, and the curved photovoltaic element 100 can have a better fit with the building, and the overall aesthetics of the curved photovoltaic element 100 are better.

[0065] The technical features of the above-described embodiments may be combined in any manner. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there are no conflicts in the combination of these technical features, they should be considered to be within the scope of this specification. Furthermore, other implementations can be derived from the above-described embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A curved photovoltaic device, wherein: include: A battery cell, wherein the battery cell has a light-receiving surface and a backlight surface opposite to each other; A front plate, the front plate being located on one side of the light receiving surface; A conductive layer, the conductive layer is electrically connected to the battery cell, and the conductive layer is located on one side of the backlight surface; A backplane is located at a side of the conductive layer away from the battery cell. The front plate, the battery cell, the conductive layer and the backplane are stacked in sequence.

2. The curved photovoltaic device according to claim 1, wherein: The front plate, the battery cell and the back plate are all curved.

3. The curved photovoltaic device according to claim 2, wherein: The bending radius of the battery cell ranges from [25 mm to 200 mm].

4. The curved photovoltaic device according to claim 2, wherein: The longitudinal projection of the curved surface is a curve consisting of a curved segment, or the longitudinal projection of the curved surface is a curve consisting of multiple curved segments connected in sequence, or the longitudinal projection of the curved surface is an irregular curve consisting of curved segments and straight segments, the curved segment is an arc, and the ratio of the arc length of the curved segment to the corresponding chord length is in the range of [1.03, 1.67].

5. The curved photovoltaic device according to claim 4, wherein: When the longitudinal projection of the curved surface is a curve composed of multiple curved segments connected in sequence, the bending directions of the curved segments of two adjacent segments are opposite, and the bending radii of the multiple curved segments are the same; when the longitudinal projection of the curved surface is an irregular curve composed of curved segments and straight segments, the bending directions of the multiple curved segments are the same, and the bending radii of the multiple curved segments are the same.

6. The curved photovoltaic device according to claim 1, wherein: The battery cell has a positive electrode and a negative electrode, both of which are arranged on the backlight surface, and the conductive layer connects the positive electrodes and negative electrodes of adjacent battery cells.

7. The curved photovoltaic device according to claim 1, wherein: The battery cell is a whole battery cell or a battery cell consisting of multiple slices corresponding to the whole battery cell.

8. The curved photovoltaic device according to claim 1, wherein: There are gaps between the plurality of solar cells, and the curved photovoltaic device further comprises a shielding member, which is arranged on the light-receiving surfaces of two adjacent solar cells and shields the gaps.

9. The curved photovoltaic device according to claim 1, wherein: Two adjacent battery cells are seamlessly spliced; or One of the light-receiving surfaces and the other backlight surface of two adjacent battery cells are seamlessly overlapped.

10. The curved photovoltaic device according to claim 1, wherein: The curved photovoltaic component further includes a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is used to connect the front plate and the battery cell, and the second adhesive layer is used to connect the battery cell, the conductive layer and the back plate.

11. The curved photovoltaic device according to claim 1, wherein: The conductive layer is black.

12. A photovoltaic building surface, wherein: It comprises a plurality of curved photovoltaic elements, adjacent curved photovoltaic elements are connected to each other, and the curved photovoltaic element comprises: A battery cell, wherein the battery cell has a light-receiving surface and a backlight surface opposite to each other; A front plate, the front plate being located on one side of the light receiving surface; A conductive layer, the conductive layer is electrically connected to the battery cell, and the conductive layer is located on one side of the backlight surface; A backplane is located at a side of the conductive layer away from the battery cell. The front plate, the battery cell, the conductive layer and the backplane are stacked in sequence.

13. The photovoltaic building surface according to claim 12, wherein: The front plate, the battery cell and the back plate are all curved.

14. The photovoltaic building surface according to claim 13, wherein: The bending radius of the battery cell ranges from [25 mm to 200 mm].

15. The photovoltaic building surface according to claim 13, wherein: The longitudinal projection of the curved surface is a curve consisting of a curved segment, or the longitudinal projection of the curved surface is a curve consisting of multiple curved segments connected in sequence, or the longitudinal projection of the curved surface is an irregular curve consisting of curved segments and straight segments, the curved segment is an arc, and the ratio of the arc length of the curved segment to the corresponding chord length is in the range of [1.03, 1.67].

16. The photovoltaic building surface according to claim 15, wherein: When the longitudinal projection of the curved surface is a curve composed of multiple curved segments connected in sequence, the bending directions of the curved segments of two adjacent segments are opposite, and the bending radii of the multiple curved segments are the same; when the longitudinal projection of the curved surface is an irregular curve composed of curved segments and straight segments, the bending directions of the multiple curved segments are the same, and the bending radii of the multiple curved segments are the same.

17. The photovoltaic building surface according to claim 12, wherein: The battery cell has a positive electrode and a negative electrode, both of which are arranged on the backlight surface, and the conductive layer connects the positive electrodes and negative electrodes of adjacent battery cells.

18. The photovoltaic building surface according to claim 12, wherein: The battery cell is a whole battery cell or a battery cell consisting of multiple slices corresponding to the whole battery cell.

19. The photovoltaic building surface according to claim 12, wherein: There are gaps between the plurality of solar cells, and the photovoltaic building surface further comprises a shielding member, which is arranged on the light-receiving surfaces of two adjacent solar cells and shields the gaps.

20. The photovoltaic building surface according to claim 12, wherein: Two adjacent battery cells are seamlessly spliced; or One of the light-receiving surfaces and the other backlight surface of two adjacent battery cells are seamlessly overlapped.

21. The photovoltaic building surface according to claim 12, wherein: The photovoltaic building surface also includes a first adhesive layer and a second adhesive layer, the first adhesive layer is used to connect the front plate and the battery cell, and the second adhesive layer is used to connect the battery cell, the conductive layer and the back plate.

22. The photovoltaic building surface according to claim 12, wherein: The conductive layer is black.

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