Curved photovoltaic modules and photovoltaic architectural surfaces

Abstract

The curved photovoltaic module 100 includes battery pieces 50, a front plate 10, a conductive layer 60, and a back plate 90. The front plate 10 is located on the light-receiving surface 51 side of the battery pieces 50. The conductive layer 60 electrically connects the battery pieces 50, and the conductive layer 60 is located on the back-light surface 53 side of the battery pieces 50. The back plate 90 is located on the side of the conductive layer 60 away from the battery pieces 50.

Description

[Technical Field]

[0001] Priority information This application claims priority to and the benefit of patent application No. 202311518157.9, filed with the State Intellectual Property Office of China on November 14, 2023, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of photovoltaic technology, and in particular to curved photovoltaic modules and photovoltaic architectural surfaces. [Background technology]

[0003] Curved photovoltaic tiles have emerged as a response to the trend toward combining traditional roofing tiles in architecture. The first curved photovoltaic tiles were developed based on flexible copper indium gallium selenide (CuInGaSe) cell strips. While the CuInGaSe cell strips offer significant flexibility, they only offer a power generation efficiency of 12% to 14% and are expensive. To improve power generation efficiency and reduce costs, most current curved photovoltaic tiles use crystalline silicon cell strips, which offer high photoelectric conversion efficiency. However, because crystalline silicon cell strips are highly brittle and easily break when bent, the ratio of the arc length of the curved line segment to the corresponding chord length of the current curved photovoltaic tiles is small. This results in a small curvature, which limits the degree of adhesion between the curved photovoltaic tiles and the building. Summary of the Invention [Problem to be solved by the invention]

[0004] The implementation method in this application provides a curved photovoltaic module and a photovoltaic building surface, which is used to solve the problem that the curvature of the curved photovoltaic module is small and the degree of adhesion between the curved photovoltaic module and the building is not high.

[0005] In one embodiment of the present application, the curved photovoltaic module includes battery pieces, a front plate, a conductive layer, and a back plate. The battery pieces have opposing light-receiving and back-lighting surfaces. The front plate is located on the light-receiving surface side. The conductive layer electrically connects the battery pieces and is located on the back-lighting surface side. The back plate is located on the side of the conductive layer away from the battery pieces, and the front plate, battery pieces, conductive layer, and back plate are sequentially stacked.

[0006] In some implementations, the front panel, the battery strip, and the back panel are all curved.

[0007] In some implementations, the bending radius of the battery strips ranges from [25 mm, 200 mm].

[0008] In some embodiments, the vertical projection of the curved surface is a curve consisting of a single curved line segment, or the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, or the vertical projection of the curved surface is a modified curve consisting of curved line segments and straight line segments, the curved line segment is an arc, and the ratio of the arc length of the curved line segment to the corresponding chord length is in the range of [1.03, 1.67].

[0009] In some embodiments, when the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, the bending directions of two adjacent curved line segments are opposite to each other and the bending radii of the multiple curved line segments are the same; when the vertical projection of the curved surface is an irregular curve consisting of curved line segments and straight line segments, the bending directions of the multiple curved line segments are the same and the bending radii of the multiple curved line segments are the same.

[0010] In some embodiments, the battery segments have a positive electrode and a negative electrode, both of which are disposed on the backside, and the conductive layer connects the positive electrode and negative electrode of adjacent battery segments.

[0011] In some implementations, the battery strip is a single battery strip, or the battery strip is a plurality of slices of battery strips corresponding to one slice.

[0012] In some implementations, the curved photovoltaic module further includes a shielding element spaced apart between the plurality of battery pieces, the shielding element being disposed on the light-receiving surfaces of two adjacent battery pieces and shielding the gap.

[0013] In some implementations, two adjacent battery segments are seamlessly joined together.

[0014] In some implementations, the light-receiving surface of one of the adjacent battery segments and the light-receiving surface of the other of the adjacent battery segments are seamlessly joined together.

[0015] In some implementations, the curved photovoltaic module further includes a first adhesive layer and a second adhesive layer, the first adhesive layer being used to connect the front plate and the battery pieces, and the second adhesive layer being used to connect the battery pieces, the conductive layer and the back plate.

[0016] In some embodiments, the conductive layer is black.

[0017] In an embodiment of the present application, the photovoltaic building surface includes a plurality of curved photovoltaic modules according to any one of the above embodiments, and adjacent curved photovoltaic modules are connected to each other.

[0018] In the curved photovoltaic module according to the embodiment of the present application, a conductive layer is only provided on the backlight surface, and no conductive layer is provided on the light-receiving surface, which increases the contact area between the light-receiving surface and the light, thereby improving the light utilization rate of the cell segments and increasing the power generation efficiency of the curved photovoltaic module. Furthermore, because the conductive layer is provided on the same side of the cell segments, the curvature of the entire cell segments is increased, and the curvature of the curved photovoltaic module is also increased. Compared with current curved photovoltaic modules, the curved photovoltaic module according to the embodiment of the present application has a larger curvature, which allows the curved photovoltaic module to be better integrated with buildings.

[0019] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application.

[0020] The above and / or additional aspects and advantages of the present application will become apparent and readily understood from the following description of exemplary embodiments taken in conjunction with the drawings. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a structural schematic diagram of a curved photovoltaic module in some implementations of the present application; FIG. [Figure 2] 10A and 10B are structural schematic diagrams of curved photovoltaic modules in other embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a curved photovoltaic module in some further implementations of the present application; [Figure 4] 1 is a structural schematic diagram of a battery strip and a conductive layer of a curved photovoltaic module in some embodiments of the present application. [Figure 5] 10A and 10B are schematic diagrams illustrating the structure of the battery strips and conductive layers of the curved photovoltaic module in some other embodiments of the present application. [Figure 6] 1 is a structural schematic diagram of a battery strip and a conductive layer of a curved photovoltaic module in accordance with some embodiments of the present application. [Figure 7] 1 is a structural schematic diagram of a photovoltaic building surface in some implementations of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0022] In order to make the above-mentioned objects, features, and advantages of the present application more clear and easily understood, the following detailed description of specific embodiments of the present application will be provided in conjunction with the drawings. Specific details are set forth in the following description to ensure a thorough understanding of the present application. However, the present application can be implemented in many ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are intended merely to facilitate and simplify the description of this application. They do not indicate or imply that the indicated devices or elements have a specific orientation or should be configured or operated in a specific orientation, and therefore should not be understood as limiting this application.

[0024] Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to specify the number of technical features being indicated. Thus, a feature qualified as "first" or "second" may indicate or imply the inclusion of at least one of that feature. In the description herein, "plurality" means at least two, e.g., two, three, etc., unless otherwise clearly and specifically limited.

[0025] In this application, unless otherwise expressly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be interpreted broadly, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, or an indirect connection via an intermediary, and, unless otherwise expressly limited, an internal communication between two components or an interactive relationship between two components. Those skilled in the art can understand the specific meanings of the above terms according to specific circumstances.

[0026] In this application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact or indirect contact via an intermediary. Furthermore, a first feature being "above," "upper," or "on the upper surface" of a second feature may mean that the first feature is directly above or diagonally above the second feature, or that the first feature is at a higher horizontal level than the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature may mean that the first feature is directly below or diagonally below the second feature, or that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when a component is said to be "fixed" or "mounted" to another component, it may refer to the component being directly connected to the other component, or to the presence of an intervening component. When a component is said to be "connected" to another component, it may refer to the component being directly connected to the other component, or to the presence of an intervening component. Terms such as "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only mode of implementation.

[0028] Curved photovoltaic tiles have emerged as a response to the trend toward combining traditional roofing tiles in architecture. The first curved photovoltaic tiles were developed based on flexible copper indium gallium selenide (CuInGaSe) cell strips. While the CuInGaSe cell strips offer significant flexibility, they only have a power generation efficiency of 12% to 14% and are expensive. Current curved photovoltaic tiles mostly use crystalline silicon cell strips to improve power generation efficiency and reduce costs. Crystalline silicon cell strips offer high photoelectric conversion efficiency. However, because crystalline silicon cell strips are highly brittle and easily break when bent, the ratio of the arc length of the curved line segment to the corresponding chord length of current curved photovoltaic tiles is small. This small curvature results in poor adhesion between the curved photovoltaic tile and the building. To address this issue, the present application provides a curved photovoltaic module 100 (shown in FIG. 1) and a photovoltaic building surface 1000 (shown in FIG. 5).

[0029] 1 and 2, a curved photovoltaic module 100 in an embodiment of the present application includes battery pieces 50, a front plate 10, a conductive layer 60, and a back plate 90. The battery pieces 50 include opposing light-receiving surfaces 51 and back-lighting surfaces 53. The front plate 10 is located on the light-receiving surface 51 side. The conductive layer 60 electrically connects the battery pieces 50, and the conductive layer 60 is located on the back-lighting surface 53 side. The back plate 90 is located on the side of the conductive layer 60 away from the battery pieces 50, and the front plate 10, battery pieces 50, conductive layer 60, and back plate 90 are sequentially stacked.

[0030] Specifically, the curved photovoltaic module 100 is a structure that can be used to convert light energy into electrical energy to supply power to other devices and can be used as a building component. The curved photovoltaic module 100 can be attached to the top or side of a building, and the curved photovoltaic module 100 can generate electricity while improving the aesthetics of the building.

[0031] The front panel 10 is a structure used to protect the light-receiving surface 51 of the battery module 50. Preferably, the front panel 10 has a high light transmittance, for example, 70% or more, allowing most or all of the light to pass through the front panel 10 and reach the battery module 50, which can convert the received light energy into electrical energy. For example, the light transmittance of the front panel 10 may 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%, etc. The material of the front panel 10 may be, but is not limited to, transparent glass, polycarbonate plastic, etc. When the material of the front panel 10 is transparent glass, the light transmittance of the transparent glass front panel 10 reaches 85% to 90%, and the light transmittance of the front panel 10 is high and the strength of the transparent glass front panel 10 is high, thereby providing excellent protection for the battery strips 50. When the material of the front panel 10 is polycarbonate plastic, the light transmittance of the polycarbonate plastic front panel 10 reaches 89%, and the light transmittance of the front panel 10 is also high. The polycarbonate plastic front panel 10 has good bending performance and is light in weight, which reduces the overall weight of the curved photovoltaic module 100 and makes it easier to transport and move.

[0032] The back plate 90 is a structure used to protect the back surface 53 of the battery strip 50. The battery strip 50 is disposed between the front plate 10 and the back plate 90, and 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, and the polymer material includes polyethylene terephthalate (PET) and a PET composite material. When the back plate 90 is made of glass, the back plate 90 has high strength and can effectively protect the battery strip 50. When the back plate 90 is made of a polymer material, the back plate 90 has low weight and good bending performance.

[0033] The battery segments 50 are structures used to convert light energy into electrical energy. The light-receiving surfaces 51 of the battery segments 50 are used to receive light energy and convert it into electrical energy. A conductive layer 60 is welded to the backlight surfaces 53 of the battery segments 50, connecting the positive and negative electrodes of adjacent battery segments 50. The conductive layer 60 also transmits the electrical energy generated by the battery segments 50 to an electrical circuit, allowing the curved photovoltaic module 100 to supply power to other components. Preferably, the conductive layer 60 is made of a metal material, including but not limited to silver and copper. The conductive layer 60 may have a linear or strip-like structure. In the embodiment of the present application, the conductive layer 60 is black. The black conductive layer 60 is connected to the backlight surfaces 53 of the battery segments 50, so that the curved photovoltaic module 100 as a whole has a uniform black color and a good aesthetic appearance.

[0034] The battery strip 50 may be a thin-film battery strip or a crystalline silicon battery strip, and the battery strip 50 in this application is a crystalline silicon battery strip. The battery strip 50 has a positive electrode and a negative electrode, and both the positive and negative electrodes of the battery strip 50 are disposed on the backside 53 of the battery strip 50, so that the conductive layer 60 only needs to be connected to the backside 53 of the battery strip 50. When the conductive layer 60 is disposed on the backside 53 of the battery strip 50, the light-receiving surface 51 of the battery strip 50 is not obstructed by the conductive layer 60, which improves the photoelectric conversion efficiency of the battery strip 50 and improves the appearance of the battery strip 50.

[0035] The positive and negative electrodes of the battery strips used in current curved photovoltaic modules are respectively disposed on the light-receiving surface and the backlight surface of the battery strip, and the conductive layers must extend over the light-receiving surface and the backlight surface of the battery strip. When the battery strip is bent, the conductive layer easily pulls the battery strip, reducing the bending radius of the battery strip and even causing the battery strip to break. Referring to FIGS. 1 to 3, in the curved photovoltaic module 100 according to the embodiment of the present application, the conductive layer 60 is disposed only on the backlight surface 53 of the battery strip 50. When the battery strip 50 is bent, the conductive layer 60 does not pull the battery strip 50, allowing the battery strip 50 to bend at a greater radius and reducing the risk of breaking the battery strip 50.

[0036] In the curved photovoltaic module 100 according to the embodiment of the present application, the conductive layer 60 is only provided on the back surface 53 of the cell segment 50, and no conductive layer 60 is provided on the light-receiving surface 51, which increases the contact area between the light-receiving surface 51 and light, improves the light utilization rate of the cell segment 50, and increases the power generation efficiency of the curved photovoltaic module 100. Furthermore, because the conductive layer 60 is provided on the same side of the cell segment 50, the overall bending radius of the cell segment 50 increases, and the bending radius of the curved photovoltaic module 100 also increases. Compared to current curved photovoltaic modules, the curved photovoltaic module 100 according to the embodiment of the present application has a larger bending radius, which allows the curved photovoltaic module 100 to have excellent architectural compatibility and the overall aesthetics of the curved photovoltaic module 100 are good.

[0037] The curved photovoltaic module 100 will be further described below in conjunction with the drawings.

[0038] 1 , in some embodiments, the front plate 10, the battery pieces 50, and the back plate 90 all have the same curved surface shape. Specifically, the front plate 10, the battery pieces 50, the conductive layer 60, and the back plate 90 all have the same curvature, and the front plate 10, the battery pieces 50, the conductive layer 60, and the back plate 90 all have the same curvature radius. The front plate 10 and the light-receiving surface 51 of the battery pieces 50, the conductive layer 60 and the back plate 90 can all be completely bonded together, as can the back surface 53 of the battery pieces 50 and the conductive layer 60 and the back plate 90.

[0039] As previously described with reference to FIG. 1 , the front panel 10, the battery module 50, and the back panel 90 all have the same curved surface. In some embodiments, the vertical projection of the curved surface is a curve consisting of a single curved line segment, as shown in FIG. 2, which allows the curved photovoltaic module 100 to have a small volume, light weight, and easy portability. In other embodiments, the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, as shown in FIG. 1, which allows the curve consisting of multiple curved line segments to have a wavy shape, which allows the curved photovoltaic module 100 to have a large volume and allows the curved photovoltaic module 100 to be easily assembled into a building. In still other embodiments, the vertical projection of the curved surface is a non-circular curve consisting of curved and straight line segments, as shown in FIG. 3, which allows the bending radius of the battery module 50 to be the bending radius of the curved shape at the largest bending point, and the non-circular curve is formed by sequentially connecting the curved and straight line segments. The overall appearance of the curved photovoltaic module 100 is beautiful, and the attachment between multiple curved photovoltaic modules 100 is stable.

[0040] Regardless of the above implementation of the curve, all curved line segments are arc-shaped, and the ratio of the arc length of a curved line segment to the corresponding chord length is in the range of [1.03, 1.67]. For example, the ratio of the arc length of a curved line segment to the corresponding chord length may 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, etc. The shape of the vertical projection curve of the front panel 10 is the same as the shape of the vertical projection curve of the battery section 50, the shape of the vertical projection curve of the conductive layer 60, and the shape of the vertical projection curve of the back panel 90, and the ratio of the arc length to the corresponding chord length of the curved line segment of the front panel 10 is the same as the ratio of the arc length to the corresponding chord length of the curved line segment of the battery section 50, the ratio of the arc length to the corresponding chord length of the curved line segment of the conductive layer 60, and the ratio of the arc length to the corresponding chord length of the curved line segment of the back panel 90.

[0041] If the ratio of the arc length of the curved line segment to the corresponding chord length is less than 1.03, the curvature of the curved photovoltaic module 100 is not clear enough, the degree of architectural integration is not high, and the aesthetics are not satisfactory. If the ratio of the arc length of the curved line segment to the corresponding chord length is greater than 1.67, the curvature of the curved photovoltaic module 100 is too large, which makes the curved photovoltaic module 100 more likely to break. If the ratio of the arc length of the curved line segment to the corresponding chord length is [1.03, 1.67], the curvature of the curved photovoltaic module 100 is clear, the degree of architectural integration is high, the aesthetics are good, and the curved photovoltaic module 100 is not more likely to break.

[0042] 1 , in some embodiments, the bending radius of the battery segment 50 ranges from [25 mm to 200 mm]. Here, the bending radius of the battery segment 50 refers to the bending radius of each curved line segment. In this case, the bending radius of the battery segment 50 may 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, etc.

[0043] Specifically, if the bending radius of the battery piece 50 is smaller than 25 mm, there is a high risk of the battery piece 50 breaking. If the bending radius of the battery piece 50 is larger than 200 mm, the bending radius of the battery piece 50 is not clear enough, the aesthetic appearance is not satisfactory, and the degree of adhesion to the building is not high. If the bending radius of the battery piece 50 is in the range of [25 mm, 200 mm], the bending radius of the battery piece 50 is clear, the aesthetic appearance is good, the degree of adhesion to the building is high, and the battery piece 50 is not prone to breaking.

[0044] Continuing to refer to Figure 1, in some embodiments, when the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, the bending directions of two adjacent curved line segments are opposite, and the bending radii of the multiple curved line segments are the same. For example, when a first curved line segment of the curved photovoltaic module 100 has an upward-opening parabolic shape (the middle of the curved line segment is concave downward), a second curved line segment adjacent to the first curved line segment has a downward-opening parabolic shape (the middle of the curved line segment is raised upward), a third curved line segment adjacent to the second curved line segment also has an upward-opening parabolic shape (the middle of the curved line segment is concave downward), and a fourth curved line segment adjacent to the third curved line segment has a downward-opening parabolic shape (the middle of the curved line segment is raised upward), and thus, the shape of the curve consisting of multiple curved line segments is a wavy line. The bending radius of each curved line segment is the same, for example, the bending radius of the first curved line segment is 70.8 mm, and the bending radius of the second curved line segment, the third curved line segment and other curved line segments are all 70.8 mm, or the bending radius of the first curved line segment is 120 mm, and the bending radius of the second curved line segment, the third curved line segment and other curved line segments are all 120 mm.

[0045] Referring to Figure 3, in some embodiments, when the vertical projection of the curved surface is a modified curve consisting of curved and straight line segments, the bending directions of the curved line segments are the same and the bending radii of the curved line segments are the same. For example, the curved line segments are shaped like downward-opening parabolas (the middle of the curved line segments is raised upward), and two adjacent curved line segments are connected by a straight line segment. The bending radii of the curved line segments may be, but are not limited to, 63.4 mm, 70.8 mm, 76.8 mm, 81.3 mm, 83.5 mm, or 91.6 mm.

[0046] Referring to FIG. 1 , in some embodiments, the thickness of the battery strip 50 ranges from 20 μm to 190 μm. For example, the thickness of the battery strip 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 strip 50, the better the bending performance of the battery strip 50. Currently, the thinnest thickness of the battery strip 50 achievable in the industry is 20 μm. If the thickness of the battery strip 50 is greater than 190 μm, the battery strip 50 is too thick and its bending performance is poor. Therefore, when the thickness of the battery piece 50 falls within the range of [20 μm, 190 μm], the thickness of the battery piece 50 is thin and the bending performance is good.

[0047] Referring to FIG. 1, in some implementations, each battery segment 50 is a single battery segment 50, or a plurality of slices of battery segments 50, each corresponding to one battery segment 50.

[0048] Specifically, in one embodiment, each battery piece 50 is a single battery piece 50. This simplifies the processing of the battery piece 50. In another embodiment, each battery piece 50 is a multi-slice battery piece 50 corresponding to one piece. Specifically, each battery piece 50 is composed of multiple slices. This allows the battery piece 50 to achieve a large bending radius. For example, each battery piece 50 can be a two-slice battery piece 50 corresponding to one piece (two 1 / 2 slices), a three-slice battery piece 50 corresponding to one piece (three 1 / 3 slices), a four-slice battery piece 50 corresponding to one piece (four 1 / 4 slices), a five-slice battery piece 50 corresponding to one piece (five 1 / 5 slices), and a six-slice battery piece 50 corresponding to one piece (six 1 / 6 slices). If a curved line segment corresponds to one battery piece 50, processing the battery piece 50 as a 1 / 2-slice battery piece 50 allows the two-slice battery piece 50 to achieve a greater degree of bending radius than the single-slice battery piece 50. Furthermore, the more single slices a battery piece 50 has, the greater the degree of bending radius the battery piece 50 can achieve. In one example, the multiple battery pieces 50 all have the same number of slices. For example, the multiple battery pieces 50 can all be 1 / 2-slice battery pieces 50, or the multiple battery pieces 50 can all be 1 / 3-slice battery pieces 50, or the multiple battery pieces 50 can all be 1 / 4-slice battery pieces 50. In another example, the multiple battery pieces 50 can have different numbers of slices. For example, some battery pieces 50 can be 1 / 2-slice battery pieces 50 and some battery pieces 50 can be 1 / 4-slice battery pieces 50. Alternatively, some of the battery pieces 50 may be 1 / 3 sliced ​​battery pieces 50, and some of the battery pieces 50 may be 1 / 6 sliced ​​battery pieces 50, and so on.

[0049] 4 to 6, the battery pieces 50 may be arranged in a sequential manner with a gap between adjacent battery pieces 50, or may be arranged in a sequential manner with no gap between adjacent battery pieces 50. In some embodiments, when a gap exists between adjacent battery pieces 50 (as shown in FIG. 4), the light-receiving surface 51 of the battery pieces 50 may have a large bending radius and a small bending radius. When the bending radius of the battery pieces 50 is small, there is a gap between adjacent battery pieces 50, so there is no interference between adjacent battery pieces 50, which can cause the battery pieces 50 to break.

[0050] Here, when the conductive layer 60 is welded to the backlight surfaces 53 of multiple battery components 50 and there is a gap between adjacent battery components 50, the welding strip will be exposed through the gap, resulting in an uneven color across the battery components 50 and poor aesthetics. In one example, the curved photovoltaic module 100 may further include a shielding element 55, which is attached to the light-receiving surfaces 51 of two adjacent battery components 50 to shield the gap and is used to shield the welding strip used to weld the conductive layer 60 in the gap to the backlight surface 53, resulting in a uniform black color across all battery components 50 and a good overall aesthetic. Preferably, the side of the shielding element 55 facing away from the light-receiving surfaces of the battery components 50 is black, and the shielding element 55 may be made of a flexible material so that the shielding element 55 can change shape as the battery components 50 are bent, avoiding interference with the battery components 50 and causing them to break. For example, the shielding element 55 may be black tape. If the spacing between adjacent battery pieces 50 is 5 mm, the width of the shielding element 55 must be greater than 5 mm, for example, 10 mm. If the width of the shielding element 55 is greater than the spacing width, the shielding element 55 can shield the welding strip and simultaneously firmly connect to the two battery pieces 50, thereby avoiding the problem of the shielding element 55 falling off due to unstable adhesion between the shielding element 55 and the battery pieces 50. In another example, the curved photovoltaic module 100 may not include the shielding element 55. In another example, the exposed welding strip between adjacent battery pieces 50 is shielded with black silk screen printing, so that all battery pieces 50 have a uniform black color overall, resulting in an aesthetically pleasing overall appearance. In another example, the curved photovoltaic module 100 can use a black welding strip, and when there is a gap between adjacent battery pieces 50, the black welding strip is exposed in the gap, so that all battery pieces 50 have a uniform black color as a whole, which has an overall aesthetic appearance.

[0051] In another embodiment, there is no gap between adjacent battery pieces 50 (as shown in FIGS. 5 and 6 ). When there is no gap between adjacent battery pieces 50, there is no need to provide the shielding element 55 shown in FIG. 2 between the battery pieces 50, which saves materials and simplifies the processing procedure. Furthermore, because the shielding element 55 shown in FIG. 2 does not block a portion of the light-receiving surface 51 of the battery piece 50, the contact area between the light-receiving surface 51 of the battery piece 50 in this embodiment and light is large, the photoelectric conversion rate of the battery piece 50 is high, and the loss of power generation by the battery piece 50 is small. In one example, two adjacent battery pieces 50 are seamlessly joined together (as shown in FIG. 5 ). In another example, the light-receiving surface 51 of one battery piece 50 and the backlight surface 53 of the other battery piece 50 of two adjacent battery pieces 50 are seamlessly joined together (as shown in FIG. 6 ). Preferably, the overlap width of the light-receiving surface 51 of one battery piece 50 and the backlight surface 53 of another battery piece 50 may be in the range of (0 mm, 1 mm). For example, the overlap width of the light-receiving surface 51 of one battery piece 50 and the backlight surface 53 of another battery piece 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. If the overlap width of the backlight surfaces 53 is greater than 1 mm, the light-receiving surface 51 of one battery component 50 is shielded by the other battery component 50 to a large extent, resulting in a large loss of power generation from the battery component 50. If the overlap width of the light-receiving surface 51 of one battery component 50 and the backlight surface 53 of the other battery component 50 falls within the range of (0 mm, 1 mm), there is no gap between the two battery components 50, and the light-receiving surface 51 of one battery component 50 is only shielded by the other battery component 50 to a small extent, resulting in a small loss of power generation from the battery component 50.

[0052] 1, in some embodiments, the curved photovoltaic module 100 further includes a first adhesive layer 30 and a second adhesive layer 70, where the first adhesive layer 30 connects the front plate 10 and the battery pieces 50, and the second adhesive layer 70 connects the battery pieces 50, the conductive layer 60, and the back plate 90. Here, the first adhesive layer 30 can transmit light.

[0053] Specifically, the first adhesive layer 30 is used to tightly connect the front plate 10 and the light-receiving surface 51 of the battery module 50, and the second adhesive layer 70 is used to tightly connect the back surface 53 of the conductive layer 60 and the back plate 90. Preferably, the first adhesive layer 30 is an optically transparent adhesive, which minimizes the loss of light passing through the first adhesive layer 30 as it travels through the front plate 10 and the first adhesive layer 30 to reach the battery module 50. For example, the light transmittance of the first adhesive layer 30 may be 70% or more, and may 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%, etc. Here, optical transparent adhesives include, but are not limited to, ethylene vinyl acetate (EVA), polyolefin elastomer (POE), polyvinyl butyral (PVB), silica gel, etc.

[0054] In one embodiment, the second adhesive layer 70 is opaque and the back panel 90 is translucent. The second adhesive layer 70 may be a black adhesive film or a transparent cut-off adhesive film, where the black adhesive film is almost opaque and the transparent cut-off adhesive film has a light transmittance of 30% or less. The back panel 90 may be made of translucent glass or a translucent PET material. Preferably, the second adhesive layer 70 is a black adhesive film, which allows the curved photovoltaic module 100 to have a uniform black color overall and a good aesthetic appearance. In another embodiment, the back panel 90 is opaque and the second adhesive layer 70 is translucent. In this case, the back panel 90 may be made of a black material, which is almost opaque, and the second adhesive layer 70 may be a translucent adhesive film, which allows the curved photovoltaic module 100 to have a uniform black color overall and a good aesthetic appearance. In another embodiment, both the second adhesive layer 70 and the back plate 90 are opaque. In this case, the second adhesive layer 70 may be a black adhesive film or a transparent cut-off adhesive film, and the back plate 90 may be made of a black material, so that the curved photovoltaic module 100 has a uniform black color as a whole and has a good aesthetic appearance. In one example, the second adhesive layer 70 is a black adhesive film, and the back plate 90 is made of a black material. In another example, the second adhesive layer 70 is a transparent cut-off adhesive film, and the back plate 90 is made of a black material. In yet another embodiment, both the second adhesive layer 70 and the back plate 90 are translucent. In this case, the second adhesive layer 70 may be a translucent adhesive film, and the back plate 90 is made of a transparent material.

[0055] 7, the photovoltaic building surface 1000 in the embodiment of the present application includes a plurality of curved photovoltaic modules 100 according to any of the above embodiments, and adjacent curved photovoltaic modules 100 are connected to each other. When waterproofing of the product is required, the area required for overlapping adjacent curved photovoltaic modules 100 is smaller than that of a flat photovoltaic module, the contact area between the curved photovoltaic modules 100 and light is larger, and the photoelectric conversion efficiency is higher.

[0056] In the curved photovoltaic module 100 according to the embodiment of the present application, the conductive layer 60 is only provided on the back surface 53 of the cell segment 50, and no conductive layer 60 is provided on the light-receiving surface 51, which increases the contact area between the light-receiving surface 51 and light, improves the light utilization rate of the cell segment 50, and increases the power generation efficiency of the curved photovoltaic module 100. Furthermore, because the conductive layer 60 is provided on the same side of the cell segment 50, the overall bending radius of the cell segment 50 increases, and the bending radius of the curved photovoltaic module 100 also increases. Compared to current curved photovoltaic modules, the curved photovoltaic module 100 according to the embodiment of the present application has a larger bending radius, which allows the curved photovoltaic module 100 to have excellent architectural compatibility and the overall aesthetics of the curved photovoltaic module 100 are good.

[0057] The technical features of the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification. At the same time, structural and logical substitutions and changes can be made by using the above-described embodiments to derive other implementation methods without departing from the scope of the present disclosure.

[0058] The above-mentioned embodiments merely illustrate some implementation modes of the present application, and the descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent. Those skilled in the art may make some modifications and improvements without departing from the spirit of the present application, which also fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be determined by the appended claims.

Claims

1. A curved photovoltaic module comprising: a cell strip; a front plate; a conductive layer; and a back plate; the battery piece has a light-receiving surface and a backlight surface facing each other; the front plate is located on the light receiving surface side, the conductive layer electrically connects the battery pieces, and the conductive layer is located on the back surface side; A curved photovoltaic module in which the back plate is located on the side of the conductive layer away from the battery pieces, and the front plate, the battery pieces, the conductive layer and the back plate are stacked in order.

2. The curved photovoltaic module of claim 1 , wherein the front plate, the cell strips, and the back plate are all curved.

3. 3. The curved photovoltaic module of claim 2, wherein the bending radius of the cell segments ranges from [25 mm, 200 mm].

4. 3. The curved photovoltaic module of claim 2, wherein the vertical projection of the curved surface is a curve consisting of one curved line segment, or the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, or the vertical projection of the curved surface is a modified curve consisting of curved line segments and straight line segments, the curved line segment is an arc, and the ratio of the arc length of the curved line segment to the corresponding chord length is in the range of [1.03, 1.67].

5. 5. The curved photovoltaic module of claim 4, wherein when the vertical projection of the curved surface is a curve consisting of a plurality of sequentially connected curved line segments, the bending directions of two adjacent curved line segments are opposite to each other and the bending radii of the plurality of curved line segments are the same, and when the vertical projection of the curved surface is an irregular curve consisting of curved line segments and straight line segments, the bending directions of the plurality of curved line segments are the same and the bending radii of the plurality of curved line segments are the same.

6. 2. The curved photovoltaic module of claim 1, wherein the battery pieces have a positive electrode and a negative electrode, the positive electrode and the negative electrode are both disposed on the backlight surface, and the conductive layer connects the positive electrode and the negative electrode of adjacent battery pieces.

7. 2. The curved photovoltaic module of claim 1, wherein the cell piece is a single cell piece, or the cell piece is a plurality of slices of cell pieces corresponding to one cell piece.

8. 2. The curved photovoltaic module of claim 1, wherein the curved photovoltaic module further includes a shielding element spaced apart between a plurality of the battery pieces, the shielding element being provided on the light-receiving surfaces of two adjacent battery pieces and shielding the gap.

9. Two adjacent battery pieces are seamlessly joined together, or The curved photovoltaic module of claim 1 , wherein the light-receiving surface of one of the adjacent cell pieces and the backlight surface of the other of the adjacent cell pieces are seamlessly overlapped.

10. 2. The curved photovoltaic module of claim 1, further comprising a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is used to connect the front plate and the battery pieces, and the second adhesive layer is used to connect the battery pieces, the conductive layer and the back plate.

11. The curved photovoltaic module of claim 1 , wherein the conductive layer is black.

12. A photovoltaic building surface, comprising a plurality of curved photovoltaic modules, adjacent curved photovoltaic modules being connected to each other, each curved photovoltaic module comprising a cell strip, a front plate, a conductive layer, and a back plate; the battery piece has a light-receiving surface and a backlight surface facing each other; the front plate is located on the light receiving surface side, the conductive layer electrically connects the battery pieces, and the conductive layer is located on the back surface side; A photovoltaic building surface in which the back plate is located on the side of the conductive layer away from the battery pieces, and the front plate, the battery pieces, the conductive layer and the back plate are stacked in order.

13. The photovoltaic architectural surface of claim 12 , wherein the front plate, the cell strips, and the back plate are all curved.

14. 14. The photovoltaic architectural surface of claim 13, wherein the bending radius of the cell strips ranges from [25 mm, 200 mm].

15. 14. The photovoltaic architectural surface of claim 13, wherein the vertical projection of the curved surface is a curve consisting of one curved line segment, or the vertical projection of the curved surface is a curve consisting of multiple sequentially connected curved line segments, or the vertical projection of the curved surface is a modified curve consisting of curved line segments and straight line segments, the curved line segment is an arc, and the ratio of the arc length of the curved line segment to the corresponding chord length is in the range of [1.03, 1.67].

16. 16. The photovoltaic architectural surface of claim 15, wherein when the vertical projection of the curved surface is a curve consisting of a plurality of sequentially connected curved line segments, the bending directions of two adjacent curved line segments are opposite to each other and the bending radii of the plurality of curved line segments are the same, and when the vertical projection of the curved surface is an irregular curve consisting of curved line segments and straight line segments, the bending directions of the plurality of curved line segments are the same and the bending radii of the plurality of curved line segments are the same.

17. 13. The photovoltaic architectural surface of claim 12, wherein the battery pieces have positive and negative electrodes, the positive and negative electrodes are both disposed on the backlight surface, and the conductive layer connects the positive and negative electrodes of adjacent battery pieces.

18. The photovoltaic architectural surface of claim 12 , wherein the cell strip is a single cell strip, or the cell strip is a plurality of slices of cell strips corresponding to one cell strip.

19. The photovoltaic building surface of claim 12, wherein the photovoltaic building surface further includes a shielding element at a gap between a plurality of the battery pieces, the shielding element being provided on the light receiving surface of two adjacent battery pieces and shielding the gap.

20. Two adjacent battery pieces are seamlessly joined together, or The photovoltaic architectural surface of claim 12 , wherein the light-receiving surface of one of two adjacent cell pieces and the backlight surface of the other of the adjacent cell pieces are seamlessly overlapped.

21. The photovoltaic building surface of claim 12, further comprising a first adhesive layer and a second adhesive layer, the first adhesive layer being used to connect the front plate and the battery pieces, and the second adhesive layer being used to connect the battery pieces, the conductive layer and the back plate.

22. The photovoltaic architectural surface of claim 12 , wherein the conductive layer is black.

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