Curved surface photovoltaic piece and photovoltaic building surface

Abstract

The utility model discloses a curved surface photovoltaic piece and a photovoltaic building surface. The curved photovoltaic piece comprises at least one battery string. The battery string comprises a plurality of battery pieces connected in series, and the battery pieces are arranged in the first direction of the curved-surface photovoltaic piece. The curved surface photovoltaic piece comprises at least one wave crest and at least one wave trough, and in the first direction, each battery piece in one battery string covers the wave crest and is symmetrically arranged about the axis of the wave crest along the first direction. Compared with an existing curved-surface photovoltaic piece, the illumination intensities received by the multiple battery pieces in the battery string are basically the same, so that the problem that the output current of the battery string is lowered by the battery pieces due to the fact that the current generated by the battery pieces receiving the small illumination intensity in the battery string is small can be solved.

Description

Technical Field

[0001] 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

[0002] With the increasing popularity of building photovoltaic integration, photovoltaic components (photovoltaic tiles) that can replace traditional tiles have emerged in order to better integrate with the building surface. Photovoltaic components can be flat photovoltaic components or curved photovoltaic components. Compared with flat photovoltaic components, curved photovoltaic components have both aesthetics and power generation functions due to their unique shape. At present, curved photovoltaic components usually include one or more battery strings, and the battery string is formed by multiple battery cells connected in series. However, since the multiple battery cells in a battery string are distributed at different positions of the curved photovoltaic component, the multiple battery cells in a battery string receive different light intensities at the same time. The battery cells with low light intensity generate small currents, which will reduce the output current of the battery string. Utility Model Content

[0003] The embodiments of the present application provide a curved photovoltaic device and a photovoltaic building surface, which are at least used to solve the problem that multiple cells in a battery string receive different light intensities at the same time, and the cells with low light intensity generate low current, thereby reducing the output current of the battery string.

[0004] The curved photovoltaic device of the embodiment of the present application includes at least one battery string. The battery string includes a plurality of battery cells connected in series, and the plurality of battery cells are arranged along a first direction of the curved photovoltaic device. The curved photovoltaic device includes at least one crest and at least one trough, and in the first direction, each of the battery cells in one battery string covers the crest and is symmetrically arranged about the axis of the crest along the first direction.

[0005] In some embodiments, in the second direction, opposite ends of the battery cell extend toward the lowest point of the trough, the second direction is an extension direction of a tangent line of the highest point of the crest, and the second direction intersects with the first direction.

[0006] In some embodiments, in the second direction, there is a gap between two adjacent battery strings, and the width of the gap is in the range of [3 mm, 5 mm].

[0007] In some embodiments, the difference in light intensity received by any two of the battery cells in one battery string is within a preset range.

[0008] In some embodiments, the ratio of the arc length to the chord length of the curved photovoltaic device is in the range of [1.03, 1.06].

[0009] In some embodiments, in the second direction, the length of the battery cell is positively correlated with the amount of deformation that the battery cell can withstand when bending in a conformal manner.

[0010] In some embodiments, in the second direction, the thickness of the battery cell is negatively correlated with the amount of deformation that the battery cell can withstand when bending in a conformal manner.

[0011] In some embodiments, in the second direction, the length of the battery cell is positively correlated with the deformation amount that the battery cell can withstand when bending conformally, and the thickness of the battery cell is negatively correlated with the deformation amount that the battery cell can withstand when bending conformally.

[0012] In some embodiments, the curved photovoltaic device further includes a front plate and a back plate, and the front plate, the battery string and the back plate are stacked in sequence.

[0013] In some embodiments, the front plate is a curved front plate, the battery string and the front plate are bent conformally, and the arch height of the front plate is less than or equal to the maximum deformation that the battery cell can withstand by conformal bending.

[0014] In certain embodiments, the backplane is a curved backplane, the battery string and the backplane are bent conformally, and the arch height of the backplane is less than or equal to the maximum deformation that the battery cell can withstand by conformal bending.

[0015] In some embodiments, the front plate is a curved front plate, the battery string is bent conformally with the front plate, and the arch height of the front plate is less than or equal to the maximum deformation that the battery cell can withstand by bending conformally; the back plate is a curved back plate, the battery string is bent conformally with the back plate, and the arch height of the back plate is less than or equal to the maximum deformation that the battery cell can withstand by bending conformally.

[0016] In certain embodiments, the curved photovoltaic component further includes an adhesive film layer, and the adhesive film layer is used to bond the front panel and the battery string, and to bond the battery string and the back panel.

[0017] The photovoltaic building surface of the embodiment of the present application includes the curved photovoltaic component described in the above embodiment.

[0018] In the curved photovoltaic device and photovoltaic building surface of the embodiment of the present application, multiple cells of a cell string are arranged along the first direction of the curved photovoltaic device, and each cell in a cell string covers the wave crest and is symmetrically arranged about the axis of the wave crest along the first direction, so that in the same time period, the light intensity received by multiple cells is basically the same, and the current output by the cell string is relatively large. Compared with the current curved photovoltaic device, the light intensity received by multiple cells in the cell string of the present application is basically the same, so that the problem of a small current generated by a cell in the cell string that receives a small light intensity can be avoided, and the cell will pull down the output current of the cell string.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 is a three-dimensional schematic diagram of a battery string and a back plate in certain embodiments of the present application;

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure of a battery string and a backplane;

[0023] Figure 3 yes Figure 1 A schematic diagram of the structure of a battery string and a backplane;

[0024] Figure 4 is a three-dimensional disassembled schematic diagram of a curved photovoltaic device according to certain embodiments of the present application;

[0025] Figure 5 It is a three-dimensional schematic diagram of a photovoltaic building surface in certain embodiments of the present application.

[0026] Description of main component symbols:

[0027] 1000, photovoltaic building surface; 100, curved photovoltaic component; 101, wave crest; 103, wave trough; 10, battery string; 11, battery cell; 13, interval; 15, light-receiving surface; 17, backlight surface; 30, front panel; 50, back panel; 70, film layer. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] 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 referred device or element 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.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present 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 the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] With the increasing popularity of building photovoltaic integration, photovoltaic components (photovoltaic tiles) that can replace traditional tiles have emerged in order to better integrate with the building surface. Photovoltaic components can be flat photovoltaic components or curved photovoltaic components. Compared with flat photovoltaic components, curved photovoltaic components can replace traditional tiles due to their unique shape, combining aesthetics and power generation functions. At present, curved photovoltaic components usually include one or more battery strings, and the battery string is formed by connecting multiple battery cells in series. However, since the multiple battery cells in a battery string are distributed at different positions of the curved photovoltaic component, the multiple battery cells in a battery string receive different light intensities at the same time, and the battery cells with low light intensity generate small currents, which will reduce the output current of the battery string. In order to solve this problem, the embodiment of the present application provides a curved photovoltaic component 100 ( Figure 4 Said) and photovoltaic building surface 1000 ( Figure 5 shown).

[0035] See also Figure 1 The curved photovoltaic device 100 of the embodiment of the present application includes at least one battery string 10. The battery string 10 includes a plurality of battery cells 11 connected in series, and the plurality of battery cells 11 are arranged along the first direction X of the curved photovoltaic device 100. The curved photovoltaic device 100 includes at least one crest 101 and at least one trough 103. In the first direction X, each battery cell 11 in a battery string 10 covers the crest 101 and is symmetrically arranged about the axis of the crest 101 along the first direction X.

[0036] Specifically, the curved photovoltaic element 100 is used to convert light energy into electrical energy to power other components, and can be used as a structure of a building component. For example, the curved photovoltaic element 100 can power household appliances, energy storage power supplies, street lamps and other equipment. The curved photovoltaic element 100 can generate electricity while also taking into account the aesthetics of the building.

[0037] See also Figure 1, the battery string 10 is a structure for receiving light energy and converting light energy into electrical energy. And the battery string 10 can transmit the generated electrical energy to other circuits so that the curved photovoltaic element 100 can charge other components. The battery string 10 includes a light-receiving surface 15 and a backlight surface 17, and light enters the battery string 10 from the light-receiving surface 15 of the battery string 10. The number of battery strings 10 in the curved photovoltaic element 100 can be one, two, three, four or more. In the case where the number of battery strings 10 is one, the electrical energy generated in one battery string 10 is output to charge other components. In the case where the number of battery strings 10 is multiple, multiple battery strings 10 are connected in parallel and / or in series to output the generated electrical energy to charge other components. In one example, multiple battery strings 10 are connected in parallel. At this time, the output current of the curved photovoltaic element 100 is large. In another example, multiple battery strings 10 are connected in series. At this time, the output voltage of the curved photovoltaic element 100 is large.

[0038] See also Figure 1 , a battery string 10 may include two, three, four or more battery cells 11, and multiple battery cells 11 are connected in series to form a series circuit. The battery cell 11 is a structure for receiving light energy and converting light energy into electrical energy. The positive and negative electrodes of the battery cell 11 may be respectively arranged on the light-receiving surface 15 and the backlight surface 17, and the positive and negative electrodes of the battery cell 11 may also be both arranged on the backlight surface 17. In one embodiment, the positive and negative electrodes of the battery cell 11 are respectively arranged on the light-receiving surface 15 and the backlight surface 17. At this time, the battery cell 11 may be a passivated emitter and rear cell (Passivated Emitter and RearCell, PERC) or a tunnel oxide passivating contact cell (Tunnel Oxide Passivating Contacts, TOPCON), etc. In another embodiment, the positive and negative electrodes of the battery cell 11 are both arranged on the backlight surface 17. At this time, the battery cell 11 can be an interdigitated back contact battery (IBC), an all back contact battery (ABC), a hybrid passivated back contact battery (HPBC) or a metallization wrap-through battery (MWT).

[0039] See also Figure 1, the number of crests 101 of the curved photovoltaic element 100 may be, but is not limited to, one, two, three, four or more. The number of troughs 103 of the curved photovoltaic element 100 may be, but is not limited to, one, two, three, four or more. The number of crests 101 and the number of troughs 103 may be the same or different. For example, in the case where there are two crests 101, the number of troughs 103 may be one, two or three. In the case where there are three crests 101, the number of troughs 103 may be two, three or four. The radius of the crest 101 and the radius of the trough 103 may be the same or different.

[0040] At present, the arrangement of the battery strings in most curved photovoltaic devices is as follows: the multiple battery cells of a battery string are arranged along the second direction. In this case, the multiple battery cells in a battery string will be distributed at the positions of the peak and the trough respectively. For example, the peak includes the highest point and the two opposite sides connected to the highest point, and the A battery cell, the B battery cell and the C battery cell are respectively distributed on one side of the peak, the highest point of the peak and the other side of the peak. In the same time period, the light intensity received by the A battery cell, the B battery cell and the C battery cell is different. When the light intensity received by the A battery cell is the highest, the current generated by the A battery cell is a value. At this time, the light intensity received by the B battery cell is second, and the current generated by the B battery cell is b value. The light intensity received by the C battery cell will be the smallest, and the current generated by the C battery cell is c value. The magnitude of the current generated by the three battery cells is: a>b>c. Since the battery string is a series circuit, the current output by the battery string is c value, and the current output by the battery string as a whole is small.

[0041] See also Figure 1 , each cell 11 in the battery string 10 of the present application covers the crest 101. When the cell 11 covers the crest 101, the surface of the cell 11 is unobstructed, and the light intensity received by the cell 11 is relatively large, so that the current generated by the cell 11 is relatively large, and the output current of the battery string 10 is relatively large. Preferably, each cell 11 is symmetrically arranged about the axis of the crest 101 along the first direction X. In different time periods, when the angles of sunlight shining on the curved photovoltaic element 100 are different, the cell 11 can receive a certain light intensity. And in different time periods, the difference in the intensity of light received on the cell 11 will not be too large, so that the current output by the battery string 10 in each time period is relatively stable (the output current will not change significantly with time). In the battery string 10, it is possible to avoid the situation where the current generated by a certain cell 11 is much smaller than the current generated by the remaining cells 11, thereby lowering the output current of the battery string 10.

[0042] Furthermore, since the cells 11 are arranged on the crests 101 along the first direction X, when the curved photovoltaic device 100 is assembled, the cells 11 need to be bent to conform to the front panel 30 and / or the back panel 50 ( Figure 4 The battery cell 11 is fitted with the crest 101 of the first direction X (as shown in FIG. 1 ), and the deformation of the battery cell 11 is relatively large. When the battery cell 11 is symmetrically arranged along the axis of the crest 101 along the first direction X, the forces on the left and right sides of the battery cell 11 are relatively uniform when the battery cell 11 is bent and deformed in the first direction X, so that the battery cell 11 will not be easily broken during the deformation process. And the maximum deformation that the same battery cell 11 can withstand when bending and conforming at the crest 101 will be greater than the maximum deformation that it can withstand when bending and conforming at the trough 103. Therefore, when the battery cell 11 covers the crest 101, the deformation D that the battery cell 11 can withstand is relatively large, so that the battery cell 11 is not easy to break.

[0043] In the curved photovoltaic device 100 of the embodiment of the present application, multiple cells 11 of a cell string 10 are arranged along the first direction X of the curved photovoltaic device 100, and each cell 11 in a cell string 10 covers the wave crest 101 and is symmetrically arranged about the axis of the wave crest 101 along the first direction X, so that in the same time period, the light intensity received by the multiple cells 11 is basically the same, and the current output by the cell string 10 is relatively large. Compared with the current curved photovoltaic device 100, the light intensity received by the multiple cells 11 in the cell string 10 of the present application is basically the same, so that the problem that the current generated by the cell 11 with low light intensity in the cell string 10 is small and the cell 11 will reduce the output current of the cell string 10 can be avoided.

[0044] The curved photovoltaic device 100 is further described below with reference to the accompanying drawings.

[0045] See also Figure 1 and Figure 2 , further, in some embodiments, in the second direction Y, the opposite ends of the battery cell 11 extend toward the lowest point of the trough 103, the second direction is the extension direction of the tangent of the highest point of the crest, and the second direction intersects with the first direction. Among them, the first direction X and the second direction Y of the present application are perpendicular. At this time, the battery cell 11 can cover as much of the curved photovoltaic component 100 as possible, and the arrangement of the battery cell 11 can avoid the waste of space on the curved photovoltaic component 100, thereby increasing the power generation efficiency per unit area. In the case where a battery string 10 covers a crest 101, the opposite ends of the battery cell 11 in each battery string 10 extend toward the lowest point of the trough 103, so that the gap between adjacent battery strings 10 is small, and multiple battery strings 10 can almost fill the entire curved photovoltaic component 100, and the power generation efficiency per unit area of ​​the curved photovoltaic component 100 is high.

[0046] See also Figure 1 and Figure 2 In some embodiments, in the second direction Y, there is a gap 13 between two adjacent battery strings 10, and the width of the gap 13 ranges from [3 mm, 5 mm]. For example, the width of the gap 13 can be 3 mm, 3.3 mm, 3.8 mm, 4.2 mm, 4.4 mm, 4.7 mm, 5.1 mm, 5.5 mm, 5.6 mm or 5 mm.

[0047] Since the battery cell 11 is a conductive product, if there is no interval 13 between two adjacent battery strings 10 or the width of the interval 13 is less than 3 mm, the battery cells 11 in the two adjacent battery strings 10 will have contact and conduction problems, so there will be a risk of short circuit between the adjacent battery strings 10. When the width of the interval 13 is greater than 5 mm, the interval 13 between the two adjacent battery strings 10 is too large, which will cause waste of space on the curved photovoltaic component 100, thereby reducing the power generation efficiency per unit area of ​​the curved photovoltaic component 100. When the value range of the width of the interval 13 is [3 mm, 5 mm], there will be no risk of mutual contact and conduction between the two adjacent battery strings 10. And the interval 13 between the two adjacent battery strings 10 will not be too large, and will not cause waste of space on the curved photovoltaic component 100. At this time, the power generation efficiency per unit area of ​​the curved photovoltaic component 100 is higher.

[0048] See also Figure 1 and Figure 2 In some embodiments, when a plurality of battery cells 11 in a battery string 10 are arranged along the first direction X, the difference in light intensity received by any two battery cells 11 of a battery string 10 is within a preset range. The difference in light intensity received by the two battery cells 11 is within a preset range, which means that in the same time period, after any two battery cells 11 of a battery string 10 receive the same or different light intensities, the difference in the magnitude of the current generated by the two battery cells 11 is within a predetermined range. For example, the preset range is [0, E], and the predetermined range is [0, F]. When the difference in light intensity received by any two battery cells 11 of a battery string 10 is less than the E value, the difference in the magnitude of the current generated by the any two battery cells 11 is less than the F value. When the difference in the magnitude of the current generated by any two battery cells 11 of the battery string 10 is greater than the F value, the current values ​​generated between the two battery cells 11 differ greatly, and the battery cell 11 with a smaller current will pull down the output current of the battery string 10, so that the output current of the battery string 10 is smaller. When the difference between the currents generated by any two battery cells 11 of a battery string 10 is smaller than the F value, the difference between the currents generated by the two battery cells 11 is small, so that the output current of the battery string 10 is large.

[0049] See also Figure 1 and Figure 2In some embodiments, the ratio of the arc length to the chord length of the curved photovoltaic device 100 is in the range of [1.03, 1.06]. In which, when the curved photovoltaic device 100 is assembled, each cell 11 needs to bend and deform to cover the crest 101 of the curved photovoltaic device 100 and extend toward the lowest point of the trough 103. At this time, the deformation of the cell 11 is large. After the cell 11 is bent and deformed, the ratio of the arc length to the chord length of the cell 11 is the same as the ratio of the arc length to the chord length of the curved photovoltaic device 100. When the ratio of the arc length to the chord length of the curved photovoltaic device 100 is in the range of [1.03, 1.06], the cell 11 can be bent and deformed to a large extent and is not easy to break.

[0050] The arc length of the curved photovoltaic device 100 refers to the straight length L of the curved photovoltaic device 100 in the second direction Y when the curved photovoltaic device 100 is flat. The chord length of the curved photovoltaic device 100 refers to the straight length L of the curved photovoltaic device 100 in the second direction Y after being bent. The arc length of the cell 11 refers to the straight length L of the cell 11 in the second direction Y when the cell 11 is flat. The chord length of the cell 11 refers to the straight length L of the cell 11 in the second direction Y after being bent. For example, the ratio of the arc length of the curved photovoltaic device 100 to the corresponding chord length may be 1.03, 1.034, 1.039, 1.042, 1.045, 1.047, 1.051, 1.054, 1.056 or 1.06, etc.

[0051] When the ratio of the arc length to the chord length of the curved photovoltaic component 100 is less than 1.03, that is, the ratio of the arc length to the chord length of the battery cell 11 is less than 1.03. At this time, the bending deformation amount D of the battery cell 11 is small, and the bending deformation amount of the curved photovoltaic component 100 is also small. The bending curvature of the curved photovoltaic component 100 is not obvious enough, and the aesthetics is poor. When the ratio of the arc length to the chord length of the curved photovoltaic component 100 is greater than 1.06, that is, the ratio of the arc length to the chord length of the battery cell 11 is greater than 1.06. At this time, the bending deformation amount of the battery cell 11 is too large, and the battery cell 11 is easy to break. When the value range of the ratio of the arc length to the chord length of the curved photovoltaic component 100 is [1.03, 1.06], that is, the value range of the ratio of the arc length to the chord length of the battery cell 11 is [1.03, 1.06]. At this time, the bending deformation amount of the battery cell 11 is large and it is not easy to break. Moreover, the curved photovoltaic component 100 has a larger deformation amount, a larger bending arc, and a better aesthetic appearance.

[0052] See also Figure 3 and Figure 4 In some embodiments, in the second direction Y, the length L of the battery cell 11 is positively correlated with the deformation D that the battery cell 11 can withstand when bending, and the thickness W of the battery cell 11 is negatively correlated with the deformation D that the battery cell 11 can withstand when bending.

[0053] Specifically, the longer the length L of the battery cell 11 is, the greater the deformation D that the battery cell 11 can withstand when bending with the shape, and the battery cell 11 is not easy to break when bending with the shape. For example, there are three types of battery cells 11 with lengths L of 166mm, 182mm and 210mm, and the thickness W of the battery cells 11 with the three lengths L is the same. At this time, the deformation D of the battery cell 11 with a length L of 210mm will be greater than the deformation D of the battery cell 11 with a length L of 182mm, and the deformation D of the battery cell 11 with a length L of 182mm will be greater than the deformation D of the battery cell 11 with a length L of 166mm.

[0054] The thinner the thickness W of the battery cell 11, the greater the deformation D that the battery cell 11 can withstand when bending with the shape, and the battery cell 11 is not easy to break when bending with the shape. For example, there are three types of battery cells 11 with thickness W of 190μm, 170μm and 150μm, and the lengths L of the three types of battery cells 11 with thickness W are equal. At this time, the deformation D of the battery cell 11 with a thickness W of 150μm will be greater than the deformation D of the battery cell 11 with a length L of 170μm, and the deformation D of the battery cell 11 with a length L of 150μm will be greater than the deformation D of the battery cell 11 with a length L of 190μm.

[0055] See also Figure 4 Furthermore, in some embodiments, the curved photovoltaic component 100 also includes a front panel 30, an adhesive film layer 70 and a back panel 50. The front panel 30, the adhesive film layer 70, the battery string 10, the adhesive film layer 70 and the back panel 50 are stacked in sequence, and the adhesive film layer 70 is used to bond the front panel 30 and the battery string 10, and to bond the battery string 10 and the back panel 50.

[0056] Specifically, the front plate 30 is disposed on the light-receiving surface 15 of the battery string 10, and the front plate 30 is a structure for protecting the light-receiving surface 15 of the battery string 10. Preferably, the light transmittance of the front plate 30 is high, for example, the light transmittance may be greater than or equal to 70%, so that most or even all of the light can pass through the front plate 30 to reach the battery string 10, so that the battery string 10 can convert the received light energy into electrical energy. For example, the light transmittance of the front plate 30 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 front plate 30 may be a hard front plate 30 or a flexible front plate 30 with a curved surface, and the material of the front plate 30 may be, but is not limited to, transparent glass and polycarbonate plastic, etc.

[0057] The back plate 50 is a structure for supporting and protecting the backlight surface 17 of the battery string 10. Preferably, the back plate 50 may have certain waterproof performance, insulation performance and weather resistance, so that the back plate 50 can better protect the backlight surface 17 of the battery string 10. In one embodiment, the back plate 50 may be a hard back plate 50 with a curved surface. At this time, the back plate 50 may be tempered glass or semi-tempered glass. The strength of the back plate 50 is relatively high, and it can provide good support and protection for the battery string 10. In another embodiment, the back plate 50 may be a flexible back plate 50, and the flexible back plate 50 can be bent with the curved front plate 30 to form the same curved surface as the front plate 30. At this time, the material of the back plate 50 may be, but is not limited to, polyethylene terephthalate (PET) or a composite material of PET. The back plate 50 is light in weight and has good bending performance.

[0058] The adhesive film layer 70 is a structure used to bond two other components so that the two components are tightly connected. For example, the adhesive film layer 70 can be used to bond the front plate 30 and the battery string 10, and the battery string 10 and the back plate 50. The material of the adhesive film layer 70 can be ethylene vinyl acetate (EVA), polyolefin (POE), polyvinyl butyral (PVB), or thermoplastic elastomer (TPO). At this time, the light transmittance of the adhesive film layer 70 is relatively high. In the process of light passing through the adhesive film layer 70 to reach the battery string 10, the light loss through the adhesive film layer 70 is relatively small, so the battery has a higher utilization rate of light. For example, the light transmittance of the film layer 70 may be greater than or equal to 70%, and the light transmittance of the film layer 70 may be 70%, 75.2%, 79.5%, 82.1%, 86.3%, 88.2%, 93.1%, 94.2%, 98.5%, or 100%.

[0059] See also Figures 1 to 4In some embodiments, the battery string 10 and the front plate 30 are bent in accordance with the shape, and the arch height of the front plate 30 is less than or equal to the maximum deformation that the battery cell 11 can withstand when bending in accordance with the shape. In this case, the front plate 30 is a hard front plate 30 with a curved surface. When the curved photovoltaic device 100 is assembled, the light-receiving surface 15 of the battery string 10 is attached to the front plate 30, and the battery string 10 can be bent in accordance with the shape with the front plate 30 to form a curved surface identical to the front plate 30. When the battery string 10 and the front plate 30 are bent in accordance with the shape, the arch height H of the front plate 30 is the same as the deformation of the battery cell 11. When the arch height H of the front plate 30 is less than or equal to the maximum deformation that the battery cell 11 can withstand, when the battery cell 11 and the front plate 30 are bent in accordance with the shape, the battery cell 11 will not break. For example, the maximum deformation that the battery cell 11 can withstand when bending in accordance with the shape is D1. When the arch height H of the front plate 30 is less than D1, the deformation of the battery cell 11 and the front plate 30 when bending in accordance with the shape is D. The deformation amount D of the battery cell 11 is equal to the arch height H of the front plate 30 , so the deformation amount D of the battery cell 11 is less than the maximum deformation amount D1 that the battery cell 11 can withstand when bending in accordance with the shape, and the battery cell 11 will not break when bending in accordance with the shape.

[0060] See also Figures 1 to 4 In other embodiments, the battery string 10 and the back plate 50 are bent in a conformal manner, and the arch height of the back plate 50 is less than or equal to the maximum deformation amount that the battery cell 11 can withstand when the battery cell 11 is bent in a conformal manner. In this case, the back plate 50 is a hard back plate 50 with a curved surface. When the curved photovoltaic device 100 is assembled, the backlight surface 17 of the battery string 10 is attached to the back plate 50, and the battery string 10 can be bent in a conformal manner with the back plate 50 to form a curved surface structure identical to the back plate 50. When the battery string 10 and the back plate 50 are bent in a conformal manner, the arch height H of the back plate 50 is the same as the deformation amount of the battery cell 11. When the arch height of the back plate 50 is less than or equal to the maximum deformation amount that the battery cell 11 can withstand, when the battery cell 11 and the back plate 50 are bent in a conformal manner, the battery cell 11 will not break. For example, the maximum deformation amount that the battery cell 11 can withstand when the battery cell 11 is bent in a conformal manner is D1. When the arch height H of the back plate 50 is less than D1, the deformation amount of the battery cell 11 and the back plate 50 when the battery cell 11 is bent in a conformal manner is D. The deformation amount D of the battery cell 11 is equal to the arch height H of the back plate 50 , so the deformation amount D of the battery cell 11 is less than the maximum deformation amount D1 that the battery cell 11 can withstand when bending in accordance with the shape, and the battery cell 11 will not break when bending in accordance with the shape.

[0061] See also Figures 1 to 4In some other embodiments, the battery string 10 is bent with the front plate 30, and the arch height of the front plate 30 is less than or equal to the maximum deformation amount that the battery cell 11 can withstand when the battery string 10 is bent with the back plate 50. In addition, the battery string 10 is also bent with the back plate 50, and the arch height of the back plate 50 is less than or equal to the maximum deformation amount that the battery cell 11 can withstand when the battery string 10 is bent with the back plate 50. At this time, the front plate 30 and the back plate 50 are both hard back plates 50 with curved surfaces. When the curved photovoltaic device 100 is assembled, the light-receiving surface 15 of the battery string 10 is attached to the front plate 30, and the backlight surface 17 of the battery string 10 is attached to the back plate 50. The battery string 10 can be bent with the front plate 30 and the back plate 50 to form a curved structure that is the same as the front plate 30 and the back plate 50. When the battery string 10, the front plate 30 and the back plate 50 are all bent with the front plate 30, the arch height of the front plate 30, the arch height of the back plate 50 and the deformation amount of the battery cell 11 are all the same. In the case where the arch height of the front plate 30 and the arch height of the back plate 50 are both less than or equal to the maximum deformation that the battery cell 11 can withstand, when the battery cell 11, the front plate 30 and the back plate 50 are all bent in conformity, the battery cell 11 will not break. For example, the maximum deformation that the battery cell 11 can withstand in conformity bending is D1, the arch height of the front plate 30 is H1, and the arch height of the back plate 50 is H2. In the case where the arch height H1 of the front plate 30 and the arch height H2 of the back plate 50 are both less than D1, the deformation of the battery cell 11, the front plate 30 and the back plate 50 are all bent in conformity is D. The deformation D of the battery cell 11 is equal to the arch height H1 of the front plate 30, and the deformation D of the battery cell 11 is equal to the arch height H2 of the back plate 50, so that the deformation D of the battery cell 11 is less than the maximum deformation D1 that the battery cell 11 can withstand in conformity bending, and the battery cell 11 will not break when it is bent in conformity.

[0062] See also Figure 5 The photovoltaic building surface 1000 of the embodiment of the present application includes a plurality of curved photovoltaic elements 100 of the above-mentioned embodiments, and the plurality of curved photovoltaic elements 100 are interconnected.

[0063] In the photovoltaic building surface 1000 of the embodiment of the present application, multiple cells 11 of a cell string 10 are arranged along the first direction X of the curved photovoltaic element 100, and each cell 11 in a cell string 10 covers the wave crest 101 and is symmetrically arranged about the axis of the wave crest 101 along the first direction X, so that in the same time period, the light intensity received by the multiple cells 11 is basically the same, and the current output by the cell string 10 is relatively large. Compared with the current curved photovoltaic element 100, the light intensity received by the multiple cells 11 in the cell string 10 of the present application is basically the same, so that the problem that the current generated by the cell 11 with low light intensity in the cell string 10 is small and the cell 11 will reduce the output current of the cell string 10 can be avoided.

[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0065] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A curved photovoltaic device, characterized in that: include: At least one battery string, the battery string includes a plurality of battery cells connected in series, and the plurality of battery cells are arranged along a first direction of the curved photovoltaic device; the curved photovoltaic device includes at least one crest and at least one trough, and in the first direction, each of the battery cells in a battery string covers the crest and are symmetrically arranged about the axis of the crest along the first direction.

2. The curved photovoltaic device according to claim 1, characterized in that: In the second direction, opposite ends of the battery cell extend toward the lowest point of the trough, the second direction is the extension direction of the tangent line of the highest point of the crest, and the second direction intersects with the first direction.

3. The curved photovoltaic device according to claim 2, characterized in that: In the second direction, there is a gap between two adjacent battery strings, and the width of the gap ranges from [3 mm to 5 mm].

4. The curved photovoltaic device according to claim 1, characterized in that: The difference in light intensity received by any two cells of a cell string is within a preset range.

5. The curved photovoltaic device according to claim 1, characterized in that: The ratio of the arc length to the chord length of the curved photovoltaic device is in the range of [1.03, 1.06].

6. The curved photovoltaic device according to claim 2, characterized in that: In the second direction, The length of the battery cell is positively correlated with the amount of deformation that the battery cell can withstand when bending in a conformal manner, and / or The thickness of the battery cell is negatively correlated with the deformation amount that the battery cell can withstand when bending in a conformal manner.

7. The curved photovoltaic device according to claim 1, characterized in that: The curved photovoltaic device further includes a front plate and a back plate, and the front plate, the battery string and the back plate are stacked in sequence.

8. The curved photovoltaic device according to claim 7, characterized in that: The front plate is a curved front plate, the battery string and the front plate are bent conformally, and the arch height of the front plate is less than or equal to the maximum deformation that the battery cell can withstand by conformal bending; and / or The back plate is a curved back plate, the battery string and the back plate are bent conformably, and the arch height of the back plate is less than or equal to the maximum deformation that the battery cell can withstand when bent conformably.

9. The curved photovoltaic device according to claim 7, characterized in that: The curved photovoltaic component further includes an adhesive film layer, and the adhesive film layer is used to bond the front plate and the battery string, and to bond the battery string and the back plate.

10. A photovoltaic building surface, characterized in that: A curved photovoltaic device comprising the curved photovoltaic device according to any one of claims 1 to 9.

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