Battery assembly, curved-surface photovoltaic piece and photovoltaic building surface

Abstract

The utility model discloses a battery component, a curved photovoltaic component and a photovoltaic building surface. The battery assembly comprises a plurality of battery pieces and a bus bar. The battery pieces are used for converting light energy into electric energy, and the plurality of battery pieces are electrically and physically connected through the interconnection strips to form a battery layer with a curved section. And the bus bars are electrically connected with the interconnection strips at the end parts of the battery layers and are used for leading out electric signals of the battery layers. The battery assembly comprises a covering area and a non-covering area, the covering area corresponds to at least part of the surface of at least one of the interconnection strip and the bus bar, and the color presented by the covering area is consistent with that presented by the non-covering area. In the battery assembly, the covering area corresponds to at least part of the surface of at least one of the interconnection strip and the bus bar, and the color presented by the covering area is consistent with the color presented by the non-covering area, so that the color presented by the whole battery assembly is consistent. According to the battery assembly, the overall consistency is good, and the attractiveness of the battery assembly is good.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and more specifically, to a battery assembly, a curved photovoltaic component, and a photovoltaic building surface. Background Art

[0002] In recent years, curved photovoltaic products have developed rapidly. Due to their unique shape, curved photovoltaic products are widely used on building surfaces. Curved photovoltaic products can replace traditional clay tiles while taking into account the power generation function. With the development of building photovoltaic integration, in order to better integrate with the building surface, higher appearance requirements are put forward for photovoltaic products, and all-black photovoltaic products are becoming more and more popular. The cells in photovoltaic products are usually equipped with interconnection strips and bus strips, which are used to collect the current of the cells. However, the surface of the interconnection strips and bus strips is usually silvery white, which is different from the color of the battery layer surface, and the overall consistency of the product is poor. Utility Model Content

[0003] The embodiments of the present application provide a battery assembly, a curved photovoltaic component and a photovoltaic building surface, which are at least used to solve the problem that the surface of the interconnection strips and the busbars are usually silvery white, which is different from the color of the battery layer surface and the overall consistency of the product is poor.

[0004] The battery assembly of the embodiment of the present application includes a plurality of battery cells and a busbar. The battery cells are used to convert light energy into electrical energy, and the plurality of battery cells are electrically and physically connected through interconnection strips to form a battery layer with a curved cross-section. The busbar is electrically connected to the interconnection strip at the end of the battery layer, and the busbar is used to lead out the electrical signal of the battery layer. The battery assembly includes a covering area and an uncovering area, the covering area corresponds to at least a portion of the surface of at least one of the interconnection strip and the busbar, and the color presented by the covering area is consistent with the color presented by the uncovering area.

[0005] In some embodiments, the color of at least a portion of the surface of at least one of the interconnection strip and the bus ribbon is consistent with the color of the non-covered area, and the covered area is the area where the at least a portion of at least one of the interconnection strip and the bus ribbon is located.

[0006] In certain embodiments, the battery assembly further includes a covering member, which covers at least a portion of the surface of at least one of the interconnection strip and the bus strip, and the color of the covering member is consistent with the color of the non-covering area, and the covering area is the area where the covering member is located.

[0007] In some embodiments, the battery layer includes a light-receiving surface and a backlight surface opposite to each other, both the light-receiving surface and the backlight surface are provided with the interconnection strip, and the covering member is provided on the light-receiving surface.

[0008] In certain embodiments, the color of the non-masking area is black; and the covering member is black tape or black PET.

[0009] In some embodiments, the battery layer includes a light-receiving surface and a backlight surface opposite to each other, the backlight surface is provided with the interconnection bar, there is a gap between two adjacent battery cells, the covering member corresponding to the interconnection bar is provided at the gap and is located between the interconnection bar and the backlight surface, and the covering member corresponding to the bus bar is provided on the light-receiving surface.

[0010] In some embodiments, the color of the non-covering area is black; the material of the covering member corresponding to the interconnection strip is black ethylene-vinyl acetate copolymer, black polyolefin elastomer or black silicone; the covering member corresponding to the bus strip is black tape or black polyethylene terephthalate (PET).

[0011] The curved photovoltaic device of the embodiment of the present application includes the battery assembly, front panel, back panel and film layer described in any of the above embodiments, and the front panel, the film layer, the battery assembly, the film layer and the back panel are stacked in sequence, and the light-receiving surface of the battery layer is closer to the front panel than the backlight surface of the battery layer.

[0012] In some embodiments, the bending radius of the curved photovoltaic device is in the range of [25 mm, 200 mm].

[0013] The photovoltaic building surface of the embodiment of the present application includes the multiple curved photovoltaic elements described in the above embodiment, and two adjacent curved photovoltaic elements are connected to each other.

[0014] In the battery assembly, curved photovoltaic element, and photovoltaic building surface of the embodiment of the present application, the covered area corresponds to at least a portion of the surface of at least one of the interconnection strip and the busbar, and the color presented by the covered area is consistent with the color presented by the uncovered area, so that the color presented by the battery assembly as a whole is consistent. The color presented on the surface of the battery assembly of the present application is the same color, the overall consistency of the battery assembly is good, and the aesthetics of the battery assembly is good.

[0015] 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

[0016] 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:

[0017] Figure 1is a schematic diagram of the structure of a battery assembly according to certain embodiments of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of a structure in which the interconnection bars and bus bars in a battery assembly are in black;

[0019] Figure 3 yes Figure 1 A schematic diagram of a structure in which a covering member of a battery assembly is arranged on a light-receiving surface;

[0020] Figure 4 yes Figure 3 Schematic diagram of the structure of a battery assembly when it is bent;

[0021] Figure 5 yes Figure 1 A schematic diagram of a structure in which a covering member corresponding to an interconnection strip in a battery assembly is arranged on a backlight surface;

[0022] Figure 6 yes Figure 5 Schematic diagram of the structure of a battery assembly when it is bent;

[0023] Figure 7 is a three-dimensional exploded schematic diagram of a curved photovoltaic device according to certain embodiments of the present application;

[0024] Figure 8 It is a schematic diagram of the structure of a photovoltaic building surface in certain embodiments of the present application.

[0025] Description of main component symbols:

[0026] 10000, photovoltaic building surface; 1000, curved photovoltaic component; 100, battery module; 300, front panel; 500, film layer; 700, back panel; 101, covering area; 103, non-covering area; 10, battery layer; 11, battery cell; 13, light-receiving surface; 15, backlight surface; 17, spacer; 30, interconnection strip; 50, busbar; 70, covering component. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In recent years, curved photovoltaic products have developed rapidly. Due to their unique shape, curved photovoltaic products are widely used on building surfaces. Curved photovoltaic products can replace traditional clay tiles while taking into account the power generation function. With the development of building photovoltaic integration, in order to better integrate with the building surface, higher appearance requirements are put forward for photovoltaic products, and all-black photovoltaic products are becoming more and more popular. The cells in photovoltaic products are usually provided with interconnection strips and bus strips, which are used to collect the current of the cell. However, the surface of the interconnection strips and bus strips is usually silver-white, which is different from the color presented on the surface of the battery layer, and the overall consistency of the product is poor. In order to solve this problem, an embodiment of the present application provides a battery assembly 100 ( Figure 1 As shown), curved photovoltaic device 1000 ( Figure 7 As shown) and photovoltaic building surface 10000 ( Figure 8 shown).

[0034] See also Figure 1 and Figure 2 The battery assembly 100 of the embodiment of the present application includes a plurality of battery cells 11 and a busbar 50. The battery cell 11 is used to convert light energy into electrical energy. The plurality of battery cells 11 are electrically and physically connected through the interconnection strip 30 to form a battery layer 10 with a curved cross-section. The busbar 50 is electrically connected to the interconnection strip 30 at the end of the battery layer 10, and the busbar 50 is used to lead out the electrical signal of the battery layer 10. The battery assembly 100 includes a covering area 101 and a non-covering area 103, and the covering area 101 corresponds to at least a portion of the surface of at least one of the interconnection strip 30 and the busbar 50, and the color presented by the covering area 101 is consistent with the color presented by the non-covering area 103.

[0035] Specifically, please combine Figure 7 The battery assembly 100 is a structure for charging to store electric energy and supply power to other components. The battery assembly 100 of the present application is arranged in the curved photovoltaic element 1000. The battery assembly 100 is used to convert light energy into electric energy and supply the generated electric energy to other components. For example, the battery assembly 100 supplies the generated electric energy to household appliances, energy storage power supplies, street lamps and other equipment.

[0036] The battery layer 10 is a structure for converting light energy into electrical energy. The battery layer 10 of the present application is a battery layer 10 with a curved cross section. The curved battery layer 10 is bonded to the front plate 300 and the back plate 700 in the curved photovoltaic element 1000 to form a curved photovoltaic element. The curved photovoltaic element 1000 can be used as a decorative element on a building while generating electricity to improve the aesthetics of the building. The battery layer 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are connected in series and / or in parallel to form the battery layer 10.

[0037] See also Figure 1 , Figure 1 This is the case where the battery assembly 100 does not include the covering area 101. The interconnection bar 30 is a structure for connecting two adjacent battery cells 11. The interconnection bar 30 enables a physical connection between multiple battery cells 11, thereby forming a stable battery layer 10 structure. The battery cell 11 includes a positive electrode and a negative electrode. The interconnection bar 30 is also used to connect the positive electrode of a battery cell 11 and the negative electrode of an adjacent battery cell 11, so that multiple battery cells 11 are connected in series. The interconnection bar 30 can be a tin-coated solder strip, and the tin-coated solder strip welds two adjacent battery cells 11, so that the positive and negative electrodes of the two battery cells 11 are connected to each other. There are multiple interconnection bars 30 in the battery assembly 100, and multiple interconnection bars 30 connect multiple battery cells 11 in series to form a series circuit. The interconnection bar 30 is used to collect the current generated by multiple battery cells 11.

[0038] A plurality of battery cells 11 are connected by interconnecting strips 30 to form a battery string, and the battery layer 10 may contain one or more battery strings. The bus strip 50 may also be a tin-coated solder strip. When the number of battery strings is one, the bus strip 50 is welded to the interconnecting strips 30 at both ends of the battery string. The bus strip 50 is used to lead out the positive and negative electrodes of the battery layer 10, so as to converge the current in the battery layer 10 for output to other components. When the number of battery strings is multiple, the bus strip 50 is welded to the interconnecting strips 30 at both ends of each battery string. The bus strip 50 is used to lead out the positive and negative electrodes of each battery string, and then the bus strip 50 electrically connects the positive and negative electrodes of two adjacent battery strings, so that multiple battery strings are connected in series, and finally the positive and negative electrodes of the battery layer 10 are led out, and the current in the battery layer 10 is converged for output to other components. The electrical signal of the battery layer 10 led out by the bus strip 50 in the present application may be the current, voltage, power, etc. output by the battery layer 10.

[0039] The battery assembly 100 includes a light-receiving side and a backlight side, and the light-receiving side refers to the side where light shines on the battery assembly 100. And the light-receiving side generally refers to the surface of the battery assembly 100, and users generally see the appearance of the battery assembly 100 and the curved photovoltaic device 1000 through the light-receiving side. Therefore, if the color presented by the interconnection bar 30 and the busbar 50 is inconsistent with the color presented by the battery cell 11, and the interconnection bar 30 and the busbar 50 can be seen from the light-receiving side, the overall consistency of the battery assembly 100 is poor, and the aesthetics of the battery assembly 100 is also poor.

[0040] See also Figure 2 , the non-covered area 103 refers to the area on the light-receiving side that is not blocked by the interconnection bars 30 and the bus strips 50, that is, the area of ​​the battery cell 11 is not blocked by the interconnection bars 30 and the bus strips 50. The covered area 101 is the area corresponding to the interconnection bars 30 and the bus strips 50 exposed from the light-receiving side. Preferably, the covered area 101 corresponds to the entire surface of the interconnection bars 30, and the surface of the interconnection bars 30 refers to the side of the interconnection bars 30 exposed from the light-receiving side. The covered area 101 corresponds to the entire surface of the bus strips 50, and the surface of the bus strips 50 refers to the side of the bus strips 50 exposed from the light-receiving side. The covered area 101 of the embodiment of the present application refers to the area corresponding to the surfaces of all interconnection bars 30 and all bus strips 50 exposed from the light-receiving side. The masking area 101 is used to make the area where the interconnection strips 30 and the busbars 50 are located present the same color as the non-masking area 103, so that the overall color presented by the light-receiving side of the battery assembly 100 is consistent, the overall consistency of the battery assembly 100 is better, and the aesthetics of the battery assembly 100 is also better.

[0041] When the color presented by the non-covered area 103 is dark blue, the color presented by the covered area 101 is also dark blue. When the color presented by the non-covered area 103 is black, the color presented by the covered area 101 is also black. This application takes the example that the colors of the non-covered area 103 and the covered area 101 are both black.

[0042] In the battery assembly 100 of the embodiment of the present application, the covering area 101 corresponds to at least a portion of the surface of at least one of the interconnection strip 30 and the busbar 50, and the color presented by the covering area 101 is consistent with the color presented by the non-covering area 103, so that the color presented by the battery assembly 100 as a whole is consistent. The color presented on the surface of the battery assembly 100 of the present application is the same color, the overall consistency of the battery assembly 100 is good, and the aesthetics of the battery assembly 100 is good.

[0043] The battery assembly 100 is further described below with reference to the accompanying drawings.

[0044] See also Figure 2In some embodiments, the color of at least a portion of the surface of at least one of the interconnection strip 30 and the bus ribbon 50 is consistent with the color presented by the non-covered area 103, and the covered area 101 is the area where the at least a portion of at least one of the interconnection strip 30 and the bus ribbon 50 is located.

[0045] Preferably, the color of the entire surface of the interconnection bar 30 is consistent with the color of the non-covered area 103, and the color of the entire surface of the busbar 50 is consistent with the color of the non-covered area 103, so that the color presented by the light-receiving side of the battery assembly 100 is consistent, and the overall consistency of the battery assembly 100 is good, and the appearance is good. At this time, the covered area 101 is the area where the interconnection bar 30 and the busbar 50 are located.

[0046] When the color of the non-masking area 103 is black, the interconnection bar 30 is a black welding strip, and the bus strip 50 is also a black welding strip. After the interconnection bar 30 is welded to the multiple battery cells 11, and the bus strip 50 is welded to the interconnection bar 30, the light-receiving side of the battery assembly 100 presents a uniform black color. At this time, the processing of the battery assembly 100 is relatively simple. When the interconnection bar 30 and the bus strip 50 are both welded to the battery layer 10, the light-receiving side of the battery assembly 100 can present a uniform black color, reducing additional processing steps.

[0047] See also Figure 3 In other embodiments, the battery assembly 100 further includes a covering member 70, which covers at least a portion of the surface of at least one of the interconnection strip 30 and the busbar 50, and the color of the covering member 70 is consistent with the color of the non-covering area 103, and the covering area 101 is the area where the covering member 70 is located.

[0048] Preferably, the cover 70 covers the entire surface of the interconnection bar 30 and the entire surface of the bus strip 50. At this time, the interconnection bar 30 and the bus strip 50 are both ordinary welding strips. After the interconnection bar 30 is welded to the plurality of battery cells 11, and the bus strip 50 is welded to the interconnection bar 30, the surface of the interconnection bar 30 and the surface of the bus strip 50 are both silver-white. Therefore, the cover 70 is provided on the surface of the interconnection bar 30 and the surface of the bus strip 50, so that the color presented by the light-receiving side of the battery assembly 100 is consistent. When the non-covering area 103 is black, the color of the cover 70 is black, so that the light-receiving side of the battery assembly 100 is uniformly black.

[0049] In one example, the side of the cover 70 connected to the interconnection bar 30 is provided with adhesive, so that the cover 70 can be directly attached to the surface of the interconnection bar 30, and the cover 70 and the interconnection bar 30 can be firmly connected. The side of the cover 70 connected to the bus bar 50 is provided with adhesive, so that the cover 70 can be directly attached to the surface of the bus bar 50, and the cover 70 and the bus bar 50 can be firmly connected. In this case, the connection steps of the cover 70 and the interconnection bar 30 are relatively simple, and the connection steps of the cover 70 and the bus bar 50 are also relatively simple. In another example, the cover 70 and the adhesive are independent structures, and the cover 70 is connected to the interconnection bar 30 by the adhesive, so that the cover 70 and the interconnection bar 30 can be firmly connected. The cover 70 is connected to the bus bar 50 by the adhesive, so that the cover 70 and the bus bar 50 can be firmly connected.

[0050] See also Figure 3 In one embodiment, the battery layer 10 includes a light-receiving surface 13 and a backlight surface 15 opposite to each other, both the light-receiving surface 13 and the backlight surface 15 are provided with interconnection bars 30 , and a cover member 70 is provided on the light-receiving surface 13 .

[0051] At this time, the positive and negative electrodes of the cell 11 are respectively arranged on the light receiving surface 13 and the backlight surface 15. The cell 11 can be a Passivated Emitter and Rear Cell (PERC) or a Tunnel Oxide Passivating Contacts (TOPCON).

[0052] In one example, the negative electrode of the battery cell 11 is arranged on the light-receiving surface 13, and the positive electrode of the battery cell 11 is arranged on the backlight surface 15. When the interconnection bar 30 connects two adjacent battery cells 11, the interconnection bar 30 is connected to the light-receiving surface 13 (negative electrode) of one battery cell 11, and is connected to the backlight surface 15 (positive electrode) of the other battery cell 11. The interconnection bar 30 exposed from the light-receiving side of the battery assembly 100 is the part connected to the light-receiving surface 13 of the battery layer 10 and the part located at the interval 17 between two adjacent battery cells 11, and the cover 70 covers the interconnection bar 30 of the two parts from the light-receiving surface 13. The busbar 50 is not covered by the battery cell 11, so that the busbar 50 will be completely exposed from the light-receiving side of the battery assembly 100. The cover 70 covers the entire surface of the busbar 50 from the light-receiving surface 13, so that the light-receiving side of the battery assembly 100 can present a uniform black color, and the overall consistency and aesthetics of the battery assembly 100 are good.

[0053] See also Figure 3 and Figure 4In some embodiments, the covering member 70 is a black tape or a black polyethylene terephthalate (PET).

[0054] Specifically, when the covering member 70 is a black tape or black PET, while the covering member 70 covers the interconnection bar 30 on the light-receiving surface 13 of one battery cell 11, the covering member 70 is also bonded to the light-receiving surface 13 of another adjacent battery cell 11, so that the covering member 70 can completely cover the portion of the interconnection bar 30 exposed from the light-receiving side of the battery assembly 100. In addition, when the battery layer 10 is bent, deformation begins to occur between the multiple battery cells 11. Since both the black tape and the black PET have certain tensile properties, during the deformation of the battery cell 11, the covering member 70 connecting the two adjacent battery cells 11 can prevent the battery cell 11 from excessively deforming and thus causing hidden cracks ( Figure 4 As shown). The black tape and black PET of the present application are both weather-resistant materials, so that the cover 70 has a strong tolerance to light, heat, cold, wind and rain, etc. The cover 70 is not easily damaged and has a long service life.

[0055] In other embodiments, the cover member 70 may be black ink. The black ink is sprayed on the surface of the interconnection bar 30 and the surface of the busbar 50, so that the light-receiving side of the battery assembly 100 can present a uniform black color.

[0056] See also Figure 3 , Figure 5 and Figure 6 In another embodiment, the backlight surface 15 is provided with an interconnection bar 30, and there is a gap 17 between two adjacent battery cells 11. The covering member 70 corresponding to the interconnection bar 30 is arranged at the gap 17 and is located between the interconnection bar 30 and the backlight surface 15. The covering member 70 corresponding to the bus bar 50 is arranged on the light receiving surface 13.

[0057] At this time, the positive and negative electrodes of the cell 11 are both arranged on the backlight surface 15. The cell 11 can be an interdigitated back contact cell (IBC), an all back contact cell (ABC), a hybrid passivated back contact cell (HPBC) or a metallization wrap-through cell (MWT).

[0058] In the case where the positive and negative electrodes of the battery cells 11 are both arranged on the backlight surface 15, the interconnection bar 30 is connected to the backlight surface 15 of two adjacent battery cells 11 to connect the positive and negative electrodes of the two adjacent battery cells 11. At this time, the interconnection bars 30 are all located on the backlight surface 15 of the battery layer 10. In the case where there is a gap 17 between two adjacent battery cells 11, the interconnection bar 30 located at the gap 17 will be exposed from the light-receiving side of the battery assembly 100, and the covering member 70 corresponding to the interconnection bar 30 is used to cover the interconnection bar 30 at the gap 17, so that the light-receiving side of the battery assembly 100 can present a uniform black color. The width of the covering member 70 can be the same as the width of the gap 17, and the width of the covering member 70 can also be greater than the width of the gap 17. The width of the covering member 70 corresponding to the interconnection bar 30 of the present application is greater than the width of the gap 17. At this time, while the cover 70 covers the interconnection strip 30 exposed from the gap 17, both ends of the cover 70 are also bonded to the backlight surface 15 of the two adjacent battery cells 11, so that the cover 70 can be located between the interconnection strip 30 and the backlight surface 15. When the battery layer 10 is bent, deformation begins to occur between the multiple battery cells 11. When the cover 70 is located between the interconnection strip 30 and the backlight surface 15, during the deformation of the battery cell 11, the cover 70 can avoid rigid contact between the interconnection strip and the battery layer 10, thereby effectively avoiding the problem of hidden cracks in the battery cell 11 during the deformation process ( Figure 6 shown).

[0059] See also Figure 6 Preferably, in some embodiments, the material of the cover member 70 corresponding to the interconnection strip 30 may be black ethylene vinyl acetate copolymer (EVA), black polyolefin elastomer (POE) or black silicone. When the material of the cover member 70 is black EVA, black POE or black silicone, the cover member 70 has a certain elasticity. During the deformation of the battery cell 11, the cover member 70 can avoid rigid contact between the interconnection strip and the battery layer 10, thereby avoiding the problem of hidden cracks in the battery cell 11.

[0060] In this embodiment, the busbar 50 is not covered by the battery cell 11, so that the busbar 50 is completely exposed from the light-receiving side of the battery assembly 100. The cover 70 covers the entire surface of the busbar 50 from the light-receiving surface 13, so that the light-receiving side of the battery assembly 100 can present a uniform black color, and the overall consistency and aesthetics of the battery assembly 100 are good. The cover 70 corresponding to the busbar 50 can be a black tape or black PET.

[0061] See also Figure 1 and Figure 7The curved photovoltaic device 1000 of the embodiment of the present application includes the battery assembly 100, the front panel 300, the back panel 700 and the film layer 500 of any of the above-mentioned embodiments. The front panel 300, the film layer 500, the battery assembly 100, the film layer 500, and the back panel 700 are stacked in sequence, and the light-receiving surface 13 of the battery layer 10 is closer to the front panel 300 than the backlight surface 15 of the battery layer 10.

[0062] Specifically, the curved photovoltaic element 1000 is a structure used to convert light energy into electrical energy to power other components, and can be used as a component of a building. The curved photovoltaic element 1000 can be installed on the top or side of a building. The curved photovoltaic element 1000 can generate electricity while also improving the aesthetics of the building.

[0063] The front plate 300 is a structure for protecting the light-receiving surface 13 of the battery layer 10. The front plate 300 is a curved structure identical to the battery layer 10. The front plate 300 may be transparent tempered glass or transparent ultra-white tempered glass, etc., and the front plate 300 may also be made of transparent polymer materials such as polycarbonate. Preferably, the light transmittance of the front plate 300 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 300 to reach the battery layer 10, so that the battery layer 10 can convert the received light energy into electrical energy. For example, the light transmittance of the front plate 300 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. Since the light transmittance of the front plate 300 is relatively high, when the light-receiving side of the battery assembly 100 appears uniformly black, the curved photovoltaic component 1000 also appears uniformly black, and the curved photovoltaic component 1000 has good overall consistency and good aesthetics.

[0064] The back plate 700 is a structure for protecting the backlight surface 15 of the battery layer 10. The battery layer 10 is disposed between the front plate 300 and the back plate 700, and the battery layer 10 is protected by the front plate 300 and the back plate 700. The back plate 700 has certain waterproof and insulating properties. The side of the back plate 700 close to the battery layer 10 is black, so that the curved photovoltaic element 1000 is further made uniformly black as a whole, the overall consistency of the curved photovoltaic element 1000 is good, and the aesthetics of the curved photovoltaic element 1000 is good.

[0065] In one embodiment, the backplane 700 is a curved hard plate that is the same as the front plate 300. The material of the backplane 700 may be, but is not limited to, tempered glass or ultra-white tempered glass. In the case where the material of the backplane 700 is a curved hard plate, the strength of the backplane 700 is relatively high, and it can provide better protection for the battery layer 10. And the backplane 700 can fit tightly with both the battery layer 10 and the front plate 300, thereby forming a curved photovoltaic component. In another embodiment, the backplane 700 is a flexible backplane 700, and the material of the backplane 700 can be PET or a composite material of PET, etc. In the case where the backplane 700 is a flexible backplane 700, the weight of the backplane 700 is relatively light, so that the overall weight of the curved photovoltaic component 1000 is relatively light, and the curved photovoltaic component 1000 is easy to transport and carry. Furthermore, the back plate 700 has good bending performance. When the back plate 700 needs to be attached to both the battery layer 10 and the front plate 300 , the back plate 700 can bend to form a curved structure that is the same as the front plate 300 .

[0066] The adhesive film layer 500 is a structure used to bond two other elements so that the two elements are tightly connected. For example, the adhesive film layer 500 can be used to bond the front plate 300 and the battery assembly 100, and the battery assembly 100 and the back plate 700, so that the front plate 300, the battery assembly 100 and the back plate 700 are tightly connected to form a curved photovoltaic component 1000. The material of the adhesive film layer 500 can be EVA, POE, Polyvinyl butyral (PVB), or Thermoplastic Elastomer (TPO). At this time, the light transmittance of the adhesive film layer 500 is relatively high. In the process of light passing through the adhesive film layer 500 to reach the battery assembly 100, the amount of light loss through the adhesive film layer 500 is relatively small, so that the battery layer 10 has a higher utilization rate of light. For example, the light transmittance of the film layer 500 may be greater than or equal to 70%, and the light transmittance of the film layer 500 may be 70%, 75.2%, 79.5%, 82.1%, 86.3%, 88.2%, 93.1%, 94.2%, 98.5%, or 100%.

[0067] In the curved photovoltaic element 1000 of the embodiment of the present application, the covering area 101 corresponds to at least a portion of the surface of at least one of the interconnection strip 30 and the busbar 50, and the color presented by the covering area 101 is consistent with the color presented by the non-covering area 103, so that the color presented by the battery assembly 100 as a whole is consistent. The color presented on the surface of the battery assembly 100 of the present application is the same color, the overall consistency of the battery assembly 100 is good, and the aesthetics of the battery assembly 100 is good.

[0068] See also Figure 7 In some embodiments, the bending radius of the curved photovoltaic device 1000 ranges from [25 mm, 200 mm].

[0069] Among them, the longitudinal projection of the curved photovoltaic element 1000 is a curve composed of one or more curved segments. For example, the number of curved segments can be 1 segment, 3 segments, 6 segments, 7 segments, or 10 segments. The bending radius of the curved photovoltaic element 1000 refers to the bending radius of each curved segment (the bending radius of each curved segment in the curved photovoltaic element 1000 of the present application is the same). In the curved photovoltaic element 1000, the bending radius of the front plate 300, the bending radius of the battery assembly 100, and the bending radius of the back plate 700 are all the same.

[0070] Specifically, the bending radius of the curved photovoltaic component 1000 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. When the bending radius of the curved photovoltaic component 1000 is less than 25 mm, the deformation of the battery layer 10 in the curved photovoltaic component 1000 is too large, and the battery cells 11 in the battery layer 10 are prone to the risk of breaking. When the bending radius of the curved photovoltaic component 1000 is greater than 200 mm, the bending curvature of the curved photovoltaic component 1000 is not obvious enough, and the aesthetics is not good enough. When the value range of the bending radius of the curved photovoltaic component 1000 is [25 mm, 200 mm], the bending curvature of the curved photovoltaic component 1000 is more obvious, and the aesthetics is better. At the same time, the deformation of the battery layer 10 is within an acceptable range, and the battery cells 11 in the battery layer 10 are not easily broken.

[0071] See also Figure 8 The photovoltaic building surface 10000 of the embodiment of the present application includes a plurality of curved photovoltaic elements 1000 of the above embodiment, and two adjacent curved photovoltaic elements 1000 are connected to each other.

[0072] In the photovoltaic building surface 10000 of the embodiment of the present application, the covering area 101 corresponds to at least a portion of the surface of at least one of the interconnection strip 30 and the busbar 50, and the color presented by the covering area 101 is consistent with the color presented by the uncovered area 103, so that the color presented by the battery assembly 100 as a whole is consistent. The color presented on the surface of the battery assembly 100 of the present application is the same color, the overall consistency of the battery assembly 100 is good, and the battery assembly 100 has good aesthetics.

[0073] 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.

[0074] 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 battery assembly, characterized in that: include: A plurality of battery cells, the battery cells are used to convert light energy into electrical energy, and the plurality of battery cells are electrically and physically connected via interconnection strips to form a battery layer having a curved cross-section; and A busbar, the busbar being electrically connected to the interconnection strip at the end of the battery layer, and the busbar being used to lead out the electrical signal of the battery layer; The battery assembly includes a covering area and a non-covering area, the covering area corresponds to at least a portion of the surface of at least one of the interconnection strip and the busbar, and the color presented by the covering area is consistent with the color presented by the non-covering area.

2. The battery assembly according to claim 1, characterized in that: The color of at least a portion of the surface of at least one of the interconnection strip and the bus ribbon is consistent with the color presented by the non-covered area, and the covered area is the area where the at least a portion of at least one of the interconnection strip and the bus ribbon is located.

3. The battery assembly according to claim 1, characterized in that: The battery assembly also includes: A covering member, wherein the covering member covers at least a portion of a surface of at least one of the interconnection strip and the busbar, the color of the covering member is consistent with the color of the non-covering area, and the covering area is the area where the covering member is located.

4. The battery assembly according to claim 3, characterized in that: The battery layer comprises a light-receiving surface and a backlight surface which are opposite to each other, the light-receiving surface and the backlight surface are both provided with the interconnection strips, and the covering member is provided on the light-receiving surface.

5. The battery assembly according to claim 4, characterized in that: The color of the non-covering area is black; the covering member is a black tape or black polyethylene terephthalate (PET).

6. The battery assembly according to claim 3, characterized in that: The battery layer includes a light-receiving surface and a backlight surface opposite to each other, the backlight surface is provided with the interconnection bar, there is a gap between two adjacent battery cells, the covering member corresponding to the interconnection bar is arranged at the gap and located between the interconnection bar and the backlight surface, and the covering member corresponding to the busbar is arranged on the light-receiving surface.

7. The battery assembly according to claim 6, characterized in that: The color of the non-covering area is black; the material of the covering piece corresponding to the interconnection strip is black ethylene-vinyl acetate copolymer, black polyolefin elastomer or black silicone; the covering piece corresponding to the busbar is black tape or black PET.

8. A curved photovoltaic device, characterized in that: The curved photovoltaic component includes the battery assembly, front panel, back panel and film layer as described in any one of claims 1 to 7, wherein the front panel, the film layer, the battery assembly, the film layer and the back panel are stacked in sequence, and the light-receiving surface of the battery layer is closer to the front panel than the backlight surface of the battery layer.

9. The curved photovoltaic device according to claim 8, characterized in that: The bending radius of the curved photovoltaic device ranges from [25 mm to 200 mm].

10. A photovoltaic building surface, characterized in that: It comprises a plurality of curved photovoltaic elements as described in claim 8 or 9, wherein two adjacent curved photovoltaic elements are connected to each other.

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