Photovoltaic module and photovoltaic component

Abstract

The present application relates to a photovoltaic module and a photovoltaic component, wherein the photovoltaic module comprises a cover plate, a battery string and a back plate stacked along a first direction, the battery string comprises a plurality of battery cells arranged along a second direction, and a back adhesive film is provided between the back plate and the battery string. The back adhesive film comprises a first portion of a first color and a second portion of a second color. The projection of the first portion along the first direction at least covers the first gap between adjacent battery cells, and the projection of the second portion along the first direction is located within the projection range of the battery cells. The projection of the first portion of the back adhesive film is used to cover the first gap between adjacent battery cells, so that the appearance of the photovoltaic module at the first gap is a first color, and the first color is a color that is more coordinated with the color of the installation environment of the photovoltaic module, thereby improving the coordination between the appearance of the first gap and the installation environment, so as to increase the aesthetics of the photovoltaic module.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a photovoltaic assembly and a photovoltaic component. Background Art

[0002] At present, a photovoltaic module generally includes a plurality of cells arranged at intervals, and there is a gap between adjacent cells. The gap easily causes the appearance of the photovoltaic module to be inconsistent with the appearance of the installation environment, thereby reducing the aesthetics of the photovoltaic module. Utility Model Content

[0003] The present application provides a photovoltaic module and a photovoltaic component, which are used to solve the problem that the gap between adjacent cells causes the appearance of the photovoltaic module to be inconsistent with the appearance of the installation environment, thereby reducing the aesthetics of the photovoltaic module.

[0004] In a first aspect, the present application provides a photovoltaic module, the photovoltaic module comprising a cover plate, a battery string and a back plate stacked in a first direction, the battery string comprising a plurality of battery cells arranged in a second direction, and a back adhesive film between the back plate and the battery string. The back adhesive film comprises a first portion of a first color and a second portion of a second color. The projection of the first portion in the first direction at least covers a first gap between adjacent battery cells, and the projection of the second portion in the first direction is located within the projection range of the battery cell.

[0005] In this solution, the back film includes a first part and a second part. The projection of the first part of the back film is used to cover the first gap between adjacent cells. The first part is a first color, so that the appearance of the photovoltaic module at the first gap is the first color. The first color can be a color that is more coordinated with the color of the installation environment of the photovoltaic module, thereby improving the coordination between the appearance of the first gap and the installation environment, so as to increase the aesthetics of the photovoltaic module. In addition, the projection of the second part of the back film can be located within the projection range of the cell. The second part is a second color, so that the second part has a certain light transmittance, so as to increase the photoelectric conversion efficiency of the cell.

[0006] In this solution, the dimension of the first gap along the second direction is t1, and the dimension of the first part along the second direction is L1, where L1≥t1+1mm, so that the projection of the first part can completely cover the first gap, so that the appearance of the photovoltaic component located at the position of the first gap is the first color, thereby reducing the possibility that the first gap will cause the appearance of the photovoltaic component to be inconsistent with the installation environment, thereby reducing the risk of poor appearance of the photovoltaic component.

[0007] In this embodiment, the photovoltaic module includes at least two battery strings distributed along a third direction, and the back side adhesive film also includes a third part of the first color, and the projection of the third part along the first direction at least covers the second gap between adjacent battery strings, so that the back side adhesive film has a grid structure.

[0008] In this solution, the projection of the third part of the back film is used to cover the second gap between adjacent battery strings. The third part is the same first color as the first part, so that the appearance of the photovoltaic module at the second gap is the first color. The first color can be a color that is more coordinated with the color of the installation environment of the photovoltaic module, thereby improving the coordination between the appearance of the second gap and the installation environment, so that the appearance color of the photovoltaic module can adapt to the installation environment, and further increase the aesthetics of the photovoltaic module.

[0009] In this solution, the dimension of the second gap along the third direction is t2, and the dimension of the third part along the third direction is L2, L2≥t2+1mm, so that the projection of the third part can completely cover the second gap, so that the appearance of the photovoltaic module at the second gap is the first color, thereby reducing the possibility that the second gap between the battery strings will cause the appearance of the photovoltaic module to be inconsistent with the installation environment, thereby reducing the risk of poor appearance of the photovoltaic module.

[0010] In this embodiment, the first part and the third part are formed by any one of inkjet printing, screen printing, and gravure printing, or the material of the back adhesive film includes any one of a first color pigment, a colorant, and a fluorescent substance to form the first part and the third part, or the photovoltaic module also includes a film tape of the first color, and the film tape is bonded to the back adhesive film to form the first part and the third part, and the thickness W of the film tape satisfies 0.2mm≤W≤0.5mm.

[0011] In this solution, the first part and the third part of the first color can be formed by the above method, so that the projection of the position where the back adhesive film is the first color can cover the gap between the battery cell and the battery string, thereby improving the aesthetics of the photovoltaic module. In addition, the thickness W of the film tape satisfies 0.2mm≤W≤0.5mm, and the thickness of the film tape is moderate, which can make the photovoltaic module have good aesthetics while not causing the thickness and volume of the photovoltaic module to be too large.

[0012] In this solution, the two ends of the battery string along the second direction are provided with busbars, and the busbars are coated with a coating of the first color on the side facing the cover plate, or the busbars are affixed with a film layer of the first color on the side facing the cover plate. That is, the surface of the busbar facing the cover plate is the first color, which improves the coordination of the appearance color of the photovoltaic module and further improves the aesthetics of the photovoltaic module.

[0013] In this solution, the back plate is provided with a reflective coating, and the back plate is provided with a transmissive coating, and the projection of the transmissive coating along the first direction covers the first gap between adjacent battery cells.

[0014] In this solution, the reflective coating is arranged on the side of the backplane close to the cell, that is, the reflective coating is located between the backplane and the back film along the first direction, and the surface of the reflective coating away from the backplane is provided with a transmissive coating. When light is irradiated to the reflective coating through the transmissive coating, the light is reflected by the reflective coating to the range covered by the second part of the back film. Since the second part has a certain transmittance, the light can be irradiated to the back of the cell through the second part. Therefore, the reflective coating and the transmissive coating can increase the light irradiated to the back of the cell, thereby improving the photoelectric conversion efficiency of the cell, and then increasing the output power of the photovoltaic module.

[0015] In this solution, the first color is black and the second color is transparent.

[0016] In this solution, when the cell is black, the projection of the first part and the third part of the back film covering the first gap between the cell and the second gap between the cell strings is black, so that the appearance of the photovoltaic module is black, so as to improve the coordination of the appearance of the photovoltaic module with the color of the installation environment, thereby improving the aesthetics of the photovoltaic module, and further, it is conducive to improving the weather resistance of the photovoltaic module. At the same time, the second color is transparent, that is, the second part of the back film is transparent, so as to improve the light transmittance of the second part of the back film, and further increase the photoelectric conversion efficiency of the photovoltaic module.

[0017] In this solution, the battery cell is any one of a back contact battery (BC), a tunnel oxide passivated contact battery (TOPCon), a heterojunction battery (HIT), a passivated emitter and rear cell (PERC) or a perovskite battery.

[0018] A second aspect of the present application provides a photovoltaic component, which is the photovoltaic assembly described above, wherein the photovoltaic assembly further includes a frame, the frame is a first color, and the photovoltaic assembly is installed on a roof of a building.

[0019] In this solution, when photovoltaic modules are used for photovoltaic components, the frame is the first color, so that the appearance of the photovoltaic components is the first color, so that the photovoltaic components of the first color are more harmonious and beautiful with the building roof, improving the visual effect, thereby improving the aesthetics of the photovoltaic components.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of a photovoltaic component provided in the present application in a specific embodiment;

[0022] Figure 2 A cross-sectional view of a photovoltaic module provided in the present application in a specific embodiment;

[0023] Figure 3 A cross-sectional view of a photovoltaic module provided in the present application in another specific embodiment;

[0024] Figure 4 A top view of a battery cell provided in the present application in a specific embodiment;

[0025] Figure 5 A top view of a back adhesive film provided in the present application in a specific embodiment;

[0026] Figure 6 A top view of a battery string provided in the present application in a specific embodiment;

[0027] Figure 7 A top view of another specific embodiment of the back adhesive film provided in this application;

[0028] Figure 8 A top view of the back adhesive film provided in the present application in another specific embodiment;

[0029] Fig. 9 This is a top view of another specific embodiment of the backside adhesive film provided in the present application.

[0030] Description of reference numerals:

[0031] 1- Photovoltaic modules;

[0032] 11-cover plate;

[0033] 12-battery string;

[0034] 121-battery cell;

[0035] 121a-first gap;

[0036] 122-second gap;

[0037] 123-connection gap;

[0038] 13-back adhesive film;

[0039] 131-Part I;

[0040] 132-Part II;

[0041] 133-Part III;

[0042] 134-Part IV;

[0043] 14- back plate;

[0044] 141-reflective coating;

[0045] 142-transmissive coating;

[0046] 15-Converging belt;

[0047] 16-front adhesive film;

[0048] 2- Border.

[0049] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0050] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0051] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0052] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0053] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0054] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0056] In existing photovoltaic modules, there is a certain gap between adjacent cells. This gap causes the appearance color of the photovoltaic module to be inconsistent with the installation environment, thereby reducing the aesthetics of the photovoltaic module.

[0057] To this end, this embodiment provides a photovoltaic module to solve the above technical problems. Figure 1 and Figure 2 As shown, the photovoltaic module 1 includes a cover plate 11, a battery string 12 and a back plate 14 stacked along a first direction X, and the battery string 12 includes a plurality of battery cells 121 arranged along a second direction Y. The cover plate 11 is located on the light-facing side of the battery cell 121, and is used to transmit sunlight and improve the waterproof and moisture-proof ability of the photovoltaic module 1. The back plate 14 is located on the backlight side of the battery cell 121, and the cover plate 11 and the back plate 14 are used to seal the battery cell 121.

[0058] The photovoltaic module 1 includes a plurality of electrically connected cells 121, and adjacent cells 121 are connected by welding strips. The types of cells 121 include but are not limited to back contact cells (BC), tunnel oxide passivated contact cells (TOPCon), heterojunction cells (HIT), passivated emitter and rear cell (PERC), or perovskite cells.

[0059] For back contact cells (BC), the emitter, surface field and metal electrode are all set on the back of the cell and cross-distributed. The front of the cell uses a SiNx / SiOx double-layer anti-reflection passivation film so that there is no metal electrode blocking the front of the cell, allowing the cell to receive more incident light, reduce optical losses, and improve photoelectric conversion efficiency.

[0060] For the Tunnel Oxide Passivated Contact (TOPCon), along its thickness direction, the TOPCon cell includes a metal silver electrode, a front surface silicon nitride passivation layer, a boron-doped emitter, an N-type base silicon layer, a diffused doped layer, an ultra-thin silicon oxide, doped polysilicon, silicon nitride, and a metal silver electrode. The back of the cell is composed of an ultra-thin silicon oxide (1nm to 2nm) and a phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure can block the recombination of minority carriers and holes, and improve the open circuit voltage and short circuit current of the cell. The ultra-thin oxide layer can allow majority electrons to tunnel into the polysilicon layer while blocking the recombination of minority carriers and holes. The good passivation effect of ultra-thin silicon oxide and heavily doped silicon film causes the energy band on the silicon wafer surface to bend, thereby forming a field passivation effect, greatly increasing the probability of electron tunneling, reducing the contact resistance, and improving the open circuit voltage and short circuit current of the cell, thereby improving the cell conversion efficiency.

[0061] For heterojunction cells (Heterojunction with Intrinsic Thin-layer, HIT), along its thickness direction, the HIT cell includes a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type base silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0062] For Passivated Emitter and Rear Cell (PERC), along its thickness direction, the PERC cell includes the front surface metal silver electrode, the front surface silicon nitride passivation layer, the phosphorus layer emitter, the P-type base silicon layer, the local aluminum back field, the metal aluminum back electrode, and the back passivation layer (Al2O3 / SiNx). The PERC cell uses a passivation film to passivate the back, replacing the full aluminum back field, enhancing the internal back reflection of light in the silicon base, reducing the recombination rate of the back, and increasing the efficiency of the cell by 0.5%-1%.

[0063] For perovskite cells, along the thickness direction, the perovskite cell includes substrate material, conductive film, electron transport layer (titanium dioxide), perovskite absorption layer (hole transport layer), and metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with low loss, so they can generate higher photoelectric voltage and current, making perovskite show higher photoelectric conversion efficiency.

[0064] In this embodiment, there is no specific limitation on the type of the solar cell 121 in the photovoltaic module 1 .

[0065] The photovoltaic module 1 also includes a front adhesive film 16 and a back adhesive film 13. The front adhesive film 16 is located between the cover plate 11 and the battery cell 121, and the back adhesive film 13 is located between the back plate 14 and the battery cell 121. During the processing, the cover plate 11, the front adhesive film 16, a plurality of battery cells 121, the back adhesive film 13 and the back plate 14 are laminated. During the lamination process, the front adhesive film 16 and the back adhesive film 13 are used to encapsulate the battery cell 121 to prevent the external environment from affecting the performance of the battery cell 121. After lamination, the front adhesive film 16 connects the cover plate 11 and the battery cell 121, and the back adhesive film 13 connects the back plate 14 and the battery cell 121. In addition to the connection function, the front adhesive film 16 and the back adhesive film 13 also play the role of light transmission, support, protection and insulation.

[0066] The materials of the front adhesive film 16 and the back adhesive film 13 may be the same or different. The materials of the front adhesive film 16 and the back adhesive film 13 may be one of materials such as ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), polyvinyl butyral (PVB), etc., and may also be EPE adhesive film (EVA-POE-EVA co-extruded structure) or EP adhesive film (EVA-POE co-extruded structure).

[0067] Among them, Figure 2 As shown, the back adhesive film 13 includes a first portion 131 of a first color and a second portion 132 of a second color. The projection of the first portion 131 along the first direction X at least covers the first gap 121a between adjacent cells 121, and the projection of the second portion 132 along the first direction X is located within the projection range of the cell 121.

[0068] The first direction X may be the thickness direction of the photovoltaic module 1 , that is, the stacking direction of the cover plate 11 , the battery string 12 and the back plate 14 .

[0069] In this embodiment, the back adhesive film 13 includes a first portion 131 and a second portion 132. The projection of the first portion 131 of the back adhesive film 13 is used to cover the first gap 121a between adjacent cells 121. The first portion 131 is a first color, so that the appearance of the photovoltaic module 1 at the first gap 121a is the first color. The first color can be a color that is more coordinated with the color of the installation environment of the photovoltaic module 1, thereby improving the coordination between the appearance of the first gap 121a and the installation environment, so as to increase the aesthetics of the photovoltaic module 1. In addition, the projection of the second portion 132 of the back adhesive film 13 can be located within the projection range of the cell 121. The second portion 132 is a second color, so that the second portion 132 has a certain light transmittance, so as to increase the photoelectric conversion efficiency of the cell 121.

[0070] In addition, the color of the front film 16 can be transparent, which is conducive to more light irradiating the front of the battery cell 121 through the front film 16, which is conducive to improving the output power of the photovoltaic module 1. The color of the battery cell 121 can be the first color, that is, the color of the battery cell 121 and the first part 131 are the same, so that the appearance color of the photovoltaic module 1 is consistent and the visual effect is improved.

[0071] In a possible implementation, Figure 3 As shown, the back plate 14 is provided with a reflective coating 141 , and the back plate 14 is provided with a transmissive coating 142 , and the projection of the transmissive coating 142 along the first direction X covers the first gap 121 a between adjacent battery cells 121 .

[0072] In this embodiment, the reflective coating 141 is disposed on a side of the back plate 14 close to the cell 121, that is, the reflective coating 141 is located between the back plate 14 and the back adhesive film 13 along the first direction X, and the surface of the reflective coating 141 away from the back plate 14 is provided with a transmissive coating 142. When light is irradiated to the reflective coating 141 through the transmissive coating 142, the light is reflected by the reflective coating 141 to the range covered by the second portion 132 of the back adhesive film 13. Since the second portion 132 has a certain light transmittance, the light can be irradiated to the back of the cell 121 through the second portion 132. Therefore, the reflective coating 141 and the transmissive coating 142 can increase the light irradiated to the back of the cell 121, thereby improving the photoelectric conversion efficiency of the cell 121, and further increasing the output power of the photovoltaic module 1.

[0073] The projection of the reflective coating 141 at least covers the projection range of the battery cell 121 , or the reflective coating 141 can completely cover the surface of the back plate 14 .

[0074] In a possible implementation, Figure 4 and Figure 5 As shown, the size of the first gap 121a along the second direction Y is t1, and the size of the first part 131 along the second direction Y is L1, L1≥t1+1mm, so that the projection of the first part 131 can completely cover the first gap 121a, so that the appearance of the photovoltaic component 1 located at the position of the first gap 121a is the first color, thereby reducing the possibility that the first gap 121a causes the appearance of the photovoltaic component 1 to be inconsistent with the installation environment, thereby reducing the risk of poor appearance of the photovoltaic component 1.

[0075] Specifically, the dimension t1 of the first gap 121a along the second direction Y may be 0.8 mm ≤ t1 ≤ 1.5 mm. Accordingly, the dimension L1 of the first portion 131 along the second direction Y may be 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.4 mm, 3.5 mm, etc.

[0076] The second direction Y is the arrangement direction of the battery cells 121 in the battery string 12 , that is, the length direction of the photovoltaic module 1 .

[0077] In any of the above embodiments, Figure 6 and Figure 7 As shown, the photovoltaic module 1 includes at least two battery strings 12 distributed along the third direction Z, and the back adhesive film 13 also includes a third portion 133 of the first color, and the projection of the third portion 133 along the first direction X at least covers the second gap 122 between adjacent battery strings 12, so that the back adhesive film 13 is a grid-like structure. The third direction Z can be the width direction of the photovoltaic module 1, and the third direction Z is perpendicular to both the first direction X and the second direction Y mentioned above.

[0078] The projection of the third portion 133 of the back film 13 is used to cover the second gap 122 between adjacent battery strings 12. The third portion 133 is the same first color as the first portion 131, so that the appearance of the photovoltaic component 1 at the second gap 122 is the first color. The first color can be a color that is more coordinated with the color of the installation environment of the photovoltaic component 1, thereby improving the coordination between the appearance of the second gap 122 and the installation environment, so that the appearance color of the photovoltaic component 1 can be adapted to the installation environment, further increasing the aesthetics of the photovoltaic component 1.

[0079] like Figure 7 In the illustrated embodiment, the first portion 131 and the third portion 133 of the back adhesive film 13 are distributed in a grid shape, and the second portion 132 is located in the grid-shaped space surrounded by the first portion 131 and the third portion 133 .

[0080] In a possible implementation, Figure 6 and Figure 7 As shown, the dimension of the second gap 122 along the third direction Z is t2, and the dimension of the third part 133 along the third direction Z is L2, L2≥t2+1mm, so that the projection of the third part 133 can completely cover the second gap 122, so that the appearance of the photovoltaic component 1 at the second gap 122 is the first color, reducing the possibility that the second gap 122 between the battery strings 12 causes the appearance of the photovoltaic component 1 to be inconsistent with the installation environment, thereby reducing the risk of poor appearance of the photovoltaic component 1.

[0081] Specifically, the dimension t2 of the second gap 122 along the third direction Z may be 1.8 mm ≤ t2 ≤ 5 mm. Accordingly, the dimension L2 of the third portion 133 along the third direction Z may be 2.8 mm, 3.0 mm, 3.2 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.8 mm, 5.0 mm, 5.2 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.8 mm, 6.0 mm, 6.2 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.8 mm, 7.0 mm, etc.

[0082] Among them, Figure 6 As shown, the battery cell 121 has a chamfered area, and the chamfered areas between the battery cells 121 adjacent in the first direction X and the battery strings 12 adjacent in the third direction Z form a connection gap 123, and a portion of the back film 13 is exposed through the connection gap 123. Figure 8 As shown, the back adhesive film 13 can also be provided with a fourth portion 134 of the first color, and the projection of the fourth portion 134 along the first direction X can at least cover the connection gap 123, so that the appearance of the photovoltaic component 1 at the connection gap 123 is the first color, and the first color can be a color that is more coordinated with the color of the installation environment of the photovoltaic component 1, thereby improving the coordination between the appearance of the connection gap 123 and the installation environment, so that the appearance color of the photovoltaic component 1 can adapt to the installation environment, and further increase the aesthetics of the photovoltaic component 1.

[0083] Specifically, the size of the connection gap 123 along the second direction Y is t3, and the size of the fourth part 134 along the second direction Y is L3, L3≥t3+1mm; the size of the connection gap 123 along the third direction Z is t4, and the size of the fourth part 134 along the third direction Z is L4, L4≥t4+1mm, so that the projection of the fourth part 134 can completely cover the connection gap 123, thereby reducing the possibility that the connection gap 123 between the battery strings 12 will cause the appearance of the photovoltaic component 1 to be inconsistent with the installation environment, thereby further reducing the risk of poor appearance of the photovoltaic component 1.

[0084] For example, L3 can be t3+1mm, t3+1.5mm, t3+2mm, t3+2.5mm, t3+3mm, etc.; L4 can be t4+1mm, t4+1.5mm, t4+2mm, t4+2.5mm, t4+3.5mm, t4+4mm, etc.

[0085] In summary, the projections of the first part 131, the third part 133 and the fourth part 134 of the back film 13 can all cover the corresponding first gap 121a, the second gap 122 and the connecting gap 123. The first part 131, the third part 133 and the fourth part 134 form a grid structure, which together help to improve the aesthetics of the appearance of the battery string 12, and thus improve the aesthetics of the photovoltaic module 1.

[0086] In a possible implementation, Figure 8 As shown, in the back adhesive film 13, when the size L1 of the first portion 131 along the second direction Y is equal to the size L3 of the fourth portion 134, the size L2 of the second portion 132 along the third direction Z is equal to the size L4 of the fourth portion 134, so as to form Fig. 9 The back adhesive film 13 is shown to facilitate actual production.

[0087] In any of the above embodiments, Figure 5 and Figure 7-Figure 9 As shown, the first part 131, the third part 133 and the fourth part 134 can be formed by any of the following methods. The first method: forming by any of inkjet printing, screen printing, and gravure printing; the second method: the material of the back adhesive film 13 includes any of a first color pigment, a colorant, and a fluorescent substance to form the first part 131, the third part 133 and the fourth part 134; the third method: the photovoltaic module 1 also includes a film tape of the first color, and the film tape is bonded to the back adhesive film 13 to form the first part 131, the third part 133 and the fourth part 134.

[0088] Therefore, the first part 131, the third part 133 and the fourth part 134 of the first color can be formed in the above manner, so that the projection of the position where the back film 13 is the first color can cover the gap between the battery cell 121 and the battery string 12, thereby improving the aesthetics of the photovoltaic module 1.

[0089] For example, a film strip is provided between the cells 121 of the photovoltaic module 1, and the film strip is used to connect a plurality of adjacent cells 121. The material of the film strip is black polyethylene terephthalate (PET) and pressure-sensitive adhesive to form a film strip of a first color, and then the film strip is bonded to the back adhesive film 13 to form a first portion 131, a third portion 133 and a fourth portion 134, so that the projection of the film strip can at least cover the first gap 121a, the second gap 122 and the connection gap 123, thereby improving the aesthetics of the photovoltaic module 1. At the same time, the surface where the film strip is connected to the back adhesive film 13 is coated with a fluororesin coating to enhance the adhesion between the film strip and the back adhesive film 13, and can also help improve the weather resistance of the back adhesive film 13, and help improve the service life of the photovoltaic module 1.

[0090] Wherein, the thickness W of the film tape satisfies 0.2mm≤W≤0.5mm. For example, the thickness W of the film tape may be 0.2mm, 0.22mm, 0.24mm, 0.25mm, 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.4mm, 0.42mm, 0.44mm, 0.45mm, 0.5mm, etc. When W is too small, the film tape of the first color cannot be formed, that is, the transparency of the film tape is high, and the projection of the film tape cannot cover the first gap 121a, the second gap 122 and the connection gap 123, resulting in poor aesthetics of the photovoltaic module 1; when W is too large, the thickness of the photovoltaic module 1 is too large, increasing the volume and weight of the photovoltaic module 1, thereby increasing the production cost. Therefore, in this embodiment, 0.2mm≤W≤0.5mm, the thickness of the film tape is moderate, which can make the photovoltaic module 1 have good aesthetics while not causing the thickness and volume of the photovoltaic module 1 to be too large.

[0091] In a possible embodiment, the side surface of the back film 13 facing the battery cell 121 has a first portion 131 and a third portion 133 of the first color, or the two side surfaces of the back film 13 along the thickness direction have a first portion 131 and a third portion 133 of the first color, which can be adjusted according to the actual production and processing method.

[0092] In a possible implementation, Figure 1-Figure 3 As shown, Figure 4 and Figure 6 As shown, busbars 15 are provided at both ends of the battery string 12 along the second direction Y, and the busbars 15 are coated with a coating of the first color on the side facing the cover plate 11, or the busbars 15 are affixed with a film layer of the first color on the side facing the cover plate 11. That is, the surface of the busbars 15 facing the cover plate 11 is the first color, which improves the coordination of the appearance color of the photovoltaic module 1 and further improves the aesthetics of the photovoltaic module 1.

[0093] Among them, a coating of the first color can be coated on the surface of the bus strip 15 facing the cover plate 11, and the coating includes materials such as polyester resin, carbon black, pigment filler, and additives, so that the appearance of the coating is the first color, and thus the appearance of the bus strip 15 is the first color, or a film layer of the first color is applied to the surface of the bus strip 15 facing the cover plate 11, and the material of the film layer is black polyethylene terephthalate (PET), and then the black polyethylene terephthalate (PET) is bonded to the bus strip 15 via ethylene-vinyl acetate copolymer (EVA) adhesive, so that the surface of the bus strip 15 facing the cover plate 11 is the first color.

[0094] In any of the above embodiments, when the battery cell 121 is black, Figure 7-Figure 9As shown, the first color is black and the second color is transparent. That is, the projection of the first part 131 and the third part 133 of the back film 13 covering the first gap 121a between the battery cells 121 and the second gap 122 between the battery strings 12 is black, so that the appearance of the photovoltaic module 1 is black, so as to improve the coordination of the appearance of the photovoltaic module 1 and the color of the appearance of the installation environment, thereby improving the aesthetics of the photovoltaic module 1, and further, it is conducive to improving the weather resistance of the photovoltaic module 1. At the same time, the second color is transparent, that is, the second part 132 of the back film 13 is transparent, so as to improve the light transmittance of the second part 132 of the back film 13, and further increase the photoelectric conversion efficiency of the photovoltaic module 1.

[0095] The embodiment of the present application also provides a photovoltaic component, which includes a photovoltaic module 1, which is the photovoltaic module 1 in any of the above embodiments. The photovoltaic module 1 also includes a frame 2, which is a first color, and the photovoltaic module 1 is installed on a building roof.

[0096] When the photovoltaic module 1 is used for a photovoltaic component, the frame 2 is the first color. When the first color is black, the frame 2 is black, so that the appearance of the photovoltaic module 1 is completely black, and then the appearance of the photovoltaic component is completely black, so that the all-black photovoltaic component and the building roof are more harmonious and beautiful, improving the visual effect, thereby improving the aesthetics of the photovoltaic component.

[0097] Among them, the frame 2 can be made of a composite material formed by aluminum, iron, steel or polyurethane and glass fiber composite polymer material, and the frame 2 is coated with a fluorocarbon polyurethane coating of the first color, so that the appearance of the frame 2 is the first color, thereby improving the aesthetics of the photovoltaic. At the same time, the fluorocarbon polyurethane coating can make the frame 2 have good weather resistance, thereby improving the weather resistance of the photovoltaic component.

[0098] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module (1) comprises a cover plate (11), a battery string (12) and a back plate (14) stacked along a first direction (X), the battery string (12) comprising a plurality of battery sheets (121) arranged along a second direction (Y), and a back adhesive film (13) is provided between the back plate (14) and the battery string (12); Wherein, the back adhesive film (13) comprises a first portion (131) of a first color and a second portion (132) of a second color; The projection of the first part (131) along the first direction (X) at least covers the first gap (121a) between adjacent battery slices (121), and the projection of the second part (132) along the first direction (X) is located within the projection range of the battery slice (121).

2. The photovoltaic module according to claim 1, characterized in that: The dimension of the first gap (121a) along the second direction (Y) is t1, the dimension of the first portion (131) along the second direction (Y) is L1, and L1≥t1+1mm.

3. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module (1) comprises at least two battery strings (12) distributed along a third direction (Z), and the back adhesive film (13) further comprises a third portion (133) of a first color, wherein a projection of the third portion (133) along the first direction (X) at least covers a second gap (122) between adjacent battery strings (12), so that the back adhesive film (13) is a grid-like structure.

4. The photovoltaic module according to claim 3, characterized in that: The dimension of the second gap (122) along the third direction (Z) is t2, and the dimension of the third portion (133) along the third direction (Z) is L2, where L2≥t2+1 mm.

5. The photovoltaic module according to claim 3, characterized in that: The first part (131) and the third part (133) are formed by any one of inkjet printing, screen printing and gravure printing; or, The material of the back adhesive film (13) includes any one of a pigment, a colorant, and a fluorescent substance of a first color to form the first part (131) and the third part (133); or, The photovoltaic module (1) further comprises a film strip of a first color, the film strip being bonded to the back adhesive film (13) to form the first part (131) and the third part (133), and the thickness W of the film strip satisfies 0.2 mm ≤ W ≤ 0.5 mm.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The battery string (12) is provided with busbars (15) at both ends along the second direction (Y); the busbars (15) are coated with a coating of a first color on the side facing the cover plate (11); or the busbars (15) are affixed with a film layer of a first color on the side facing the cover plate (11).

7. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The back plate (14) is provided with a reflective coating (141), and the back plate (14) is provided with a transmissive coating (142), wherein a projection of the transmissive coating (142) along a first direction (X) covers the first gap (121a) between adjacent battery sheets (121).

8. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The first color is black, and the second color is transparent.

9. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The cell (121) is any one of a back contact cell, a tunnel oxide layer passivation contact cell, a heterojunction cell, a passivation emitter back contact cell or a perovskite cell.

10. A photovoltaic component, characterized in that: The photovoltaic component comprises: The photovoltaic assembly (1) according to any one of claims 1 to 9, further comprising a frame (2), wherein the frame (2) is of a first color, and the photovoltaic assembly (1) is installed on a roof of a building.

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