Photovoltaic module

Abstract

The application relates to the photovoltaic technology field and provides a photovoltaic module, which is at least beneficial to improving the aesthetic degree and efficiency of the photovoltaic module. The photovoltaic module comprises cell pieces, the cell pieces comprise opposite first surfaces and second surfaces, an isolation film covers the first surfaces of the cell pieces, the isolation film comprises a light-transmitting part and a light-reflecting part, the light-transmitting part is located on the first surface, the light-reflecting part is located between adjacent cell pieces, the light-reflecting part comprises a main part and a light-reflecting layer, the light-reflecting layer is located on the surface of the main part away from the cell pieces, the light-transmitting part comprises a first light-trapping part, the first light-trapping part is recessed from the surface of the light-transmitting part away from the cell pieces to the direction of the cell pieces, the main part comprises a second light-trapping part, the second light-trapping part is recessed from the surface of the light-reflecting part close to the cell pieces to the direction away from the cell pieces, and a jumper is located on the side of the light-reflecting part away from the cell pieces.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Technology

[0002] Photovoltaic power generation technology, as a mainstream technology for utilizing solar energy resources, is an important area of ​​green energy development and has already moved towards marketization and commercialization. In photovoltaic modules, light energy is converted into electrical energy through the photovoltaic effect of the solar cells. Multiple solar cells are connected in series via busbars, allowing the electrical energy generated by the cells to be collected and discharged. Adjacent cell strings are electrically connected via jumpers.

[0003] Since jumpers are typically conductors made of conductive materials, when they overlap with the solar cell array, the solder ribbons used to establish electrical connections between the cells can easily overlap with the jumpers. If the two come into direct contact, it can cause a short circuit, affecting the normal operation of the photovoltaic module. Placing the jumpers in the gaps between the cells also makes them easily exposed, resulting in poor overall integrity of the front of the photovoltaic module and affecting its aesthetics. Summary of the Invention

[0004] This application provides a photovoltaic module that at least improves the aesthetics and efficiency of the photovoltaic module.

[0005] According to some embodiments of this application, one aspect of this application provides a photovoltaic module, including: a solar cell, the solar cell including a first side and a second side facing each other; a separator film, the separator film covering the first side of a plurality of solar cells, the separator film including a light-transmitting part and a reflective part, the light-transmitting part being located on the first side, the reflective part being located between adjacent solar cells, the reflective part including a main body part and a reflective layer, the reflective layer being located on the surface of the main body part away from the solar cell; the light-transmitting part including a first light-trapping part, the first light-trapping part being recessed from the surface of the light-transmitting part away from the solar cell towards the solar cell; the main body part including a second light-trapping part, the second light-trapping part being recessed from the surface of the reflective part near the solar cell towards the direction away from the solar cell; and a jumper wire, the jumper wire being located on the side of the reflective part away from the solar cell.

[0006] In some embodiments, the shape of the first light-trapping portion includes a semi-circle, a cone, a triangular pyramid, or a multi-faceted pyramid; the shape of the second light-trapping portion includes a semi-circle, a cone, a triangular pyramid, or a multi-faceted pyramid.

[0007] In some embodiments, the method further includes: light-trapping particles, which are filled in the first light-trapping portion and / or the second light-trapping portion.

[0008] In some embodiments, the material of the light-trapping particles includes at least one of polymethyl methacrylate, polystyrene, polycarbonate, or silicone.

[0009] In some embodiments, the device further includes: an adhesive film covering the second surface and the surface of the separator away from the battery cell, the adhesive film filling the first light-trapping portion, and / or, the adhesive film filling the second light-trapping portion.

[0010] In some embodiments, the melt index of the adhesive film is greater than that of the release liner.

[0011] In some embodiments, along the arrangement direction of the battery cells, the gap width between adjacent battery cells is a first width, and the width of the reflective portion is a second width, wherein the second width is greater than or equal to the first width.

[0012] In some embodiments, the width of the jumper wire is less than or equal to the width of the reflective portion along the arrangement direction of the battery cells.

[0013] In some embodiments, the difference between the second width and the first width along the arrangement direction of the solar cells is less than the width of the second light-trapping portion.

[0014] In some embodiments, the projected area of ​​the first light-trapping part on the first surface is greater than the projected area of ​​the second light-trapping part on the first surface.

[0015] In some embodiments, the height of the first light-trapping portion along the perpendicular surface is greater than the height of the second light-trapping portion along the perpendicular surface.

[0016] In some embodiments, the reflective layer is made of a resin matrix and reflective particles.

[0017] In some embodiments, the jumper is embedded in the reflective part, and the reflective layer wraps around the jumper.

[0018] The technical solution provided in this application has at least the following advantages:

[0019] In the photovoltaic module provided in this application embodiment, a separator film is provided on the first surface of multiple solar cells. Jumpers are located on the side of the separator film away from the solar cells, which avoids direct contact between the jumpers and the solar cells or solder strips on the solar cells, thus preventing leakage and improving the reliability of the photovoltaic module. The separator film includes a light-transmitting part and a reflective part. The reflective part is located between the solar cells and has a reflective layer, which reflects sunlight passing through the gaps between the solar cells, facilitating the solar cells to reabsorb the reflected sunlight and improving the light utilization rate of the photovoltaic module. The reflective part can also shield the jumpers, preventing them from being exposed on the first surface. The overall integrity of the part of the reflective part without jumpers and the part with jumpers is improved, enhancing the aesthetics of the photovoltaic module. The light-transmitting part is provided with a first light-trapping part, and the main body is provided with a second light-trapping part. In this way, more incident light from the gaps between the cells on the first side can be reflected by the reflective part and absorbed by the cells, and more incident light from the second side can be captured by the first light-trapping part and absorbed by the cells, thereby improving the light absorption efficiency of the cells and thus improving the overall photoelectric conversion efficiency of the photovoltaic module. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A top view of a photovoltaic module provided in an embodiment of this application from the second side;

[0022] Figure 2 for Figure 1 A schematic diagram of the first type of cross-sectional structure along the AA1 direction;

[0023] Figure 3 for Figure 1 A schematic diagram of the second type of cross-sectional structure along the AA1 direction;

[0024] Figure 4 for Figure 1 A schematic diagram of the third cross-sectional structure along the AA1 direction;

[0025] Figure 5 for Figure 1 A schematic diagram of the fourth cross-sectional structure along the AA1 direction;

[0026] Figure 6 for Figure 1A schematic diagram of the fifth cross-sectional structure along the AA1 direction;

[0027] Figure 7 for Figure 1 A schematic diagram of the sixth cross-sectional structure along the AA1 direction.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Battery cell; 101. First side; 102. Second side; 110. Separator; 111. Light-transmitting part; 120. Jumper wire; 121. Reflective part; 1211. Main body; 1212. Reflective layer; 1111. First light-trapping part; 1112. Second light-trapping part; 130. Encapsulant film; 131. Light-trapping particles; 140. Busbar; 150. Solder ribbon; 160. Bypass diode. Detailed Implementation

[0030] As can be seen from the background technology, the aesthetics and efficiency of photovoltaic modules need to be improved.

[0031] The embodiments of this application provide a photovoltaic module that at least improves the aesthetics and efficiency of the photovoltaic module.

[0032] In the description of the embodiments of this application, the technical terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0033] In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0036] In the description of the embodiments of this application, technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0039] In the description of the embodiments of this application, when a component "includes" another component, it does not exclude other components unless otherwise stated, and other components may be further included. Unless otherwise stated, the terms "include" and "comprise" as used in this application are open-ended or closed-ended. For example, "include" and "comprise" may mean that other components not listed may also be included, or only the listed components may be included.

[0040] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise.

[0041] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0042] refer to Figures 1 to 3 The photovoltaic module provided in this application embodiment includes: a solar cell 100, a separator 110, and a jumper wire 120.

[0043] The battery cell 100 includes a first surface 101 and a second surface 102 facing each other.

[0044] The separator 110 covers the first surface 101 of a plurality of battery cells 100, and the separator 110 includes a light-transmitting portion 111 and a light-reflecting portion 121.

[0045] The light-transmitting portion 111 is located on the first surface 101, and the reflective portion 121 is located between adjacent solar cells 100. The reflective portion 121 includes a main body portion 1211 and a reflective layer 1212, with the reflective layer 1212 located on the surface of the main body portion 1211 away from the solar cell 100. The light-transmitting portion 111 includes a first light-trapping portion 1111, which is recessed from the surface of the light-transmitting portion 111 away from the solar cell 100 toward the solar cell 100; the main body portion 1211 includes a second light-trapping portion 1112, which is recessed from the surface of the reflective portion 121 near the solar cell 100 toward the solar cell 100.

[0046] The jumper wire 120 is located on the side of the reflector 121 away from the battery cell 100.

[0047] In the photovoltaic module provided in this application embodiment, a separator 110 is provided on the first surface 101 of multiple solar cells 100. A jumper wire 120 is located on the side of the separator 110 away from the solar cells 100, which can prevent the jumper wire 120 from directly contacting the solar cells 100 or the solder ribbons on the solar cells 100, thus avoiding leakage and improving the reliability of the photovoltaic module. The separator 110 includes a light-transmitting portion 111 and a reflective portion 121. The reflective portion 121 is located between the solar cells 100 and is provided with a reflective layer 1212, which can reflect sunlight passing through the gaps between the solar cells 100, facilitating the solar cells 100 to reabsorb the reflected sunlight and improve the light utilization rate of the photovoltaic module. The reflective portion 121 can also shield the jumper wire 120, preventing the jumper wire 120 from being exposed on the first surface 101. The overall integrity of the portion of the reflective portion 121 without the jumper wire 120 and the portion with the jumper wire 120 is improved, enhancing the aesthetics of the photovoltaic module. The light-transmitting part 111 is provided with a first light-trapping part 1111, and the main body part 1211 is provided with a second light-trapping part 1112. In this way, more incident light from the gaps between the cells 100 on the first surface 101 can be reflected by the reflective part 121 and absorbed by the cells 100, and more incident light from the second surface 102 can be captured by the first light-trapping part 1111 and absorbed by the cells 100, thereby improving the light absorption efficiency of the cells 100 and thus improving the overall photoelectric conversion efficiency of the photovoltaic module.

[0048] In some embodiments, the solar cell 100 can be any one of a PERC cell (Passivated Emitter and Rear Cell), a PERT cell (Passivated Emitter and Rear Totally-diffused cell), a TOPCon cell (Tunnel Oxide Passivated Contact), an HJT cell (Heterojunction Technology), or a BC cell (Back Contact). The BC cell can be an IBC cell (Interdigitated Back Contact), an HPBC cell (Hybrid Passivated Back Contact), a TBC cell combining TOPCon and IBC technologies, or an HBC cell combining HJT and IBC technologies; it can also be other types of back contact cells.

[0049] In some embodiments, the solar cell 100 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. Specifically, the multi-component compound solar cell can be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell.

[0050] refer to Figure 1 The battery cells 100 are connected by connecting components, including busbars 140 and solder strips 150. Solder strips 150 are used to connect adjacent battery cells 100 to form a battery string. Solder strips 150 are responsible for transmitting the current generated by the battery string to the busbars 140. Busbars 140 are used to collect the current from multiple battery strings and transmit it to the junction box to ensure effective current conduction.

[0051] Jumper 120 connects the battery string to the bypass diode 160 inside the junction box. When a battery in the module is blocked (e.g., by leaves or bird droppings) or damaged, that battery transforms from a power generator into a resistor, consuming energy from other batteries and generating intense heat, potentially burning out the module—a phenomenon known as the "hot spot effect." To address this issue, a bypass diode 160 is installed inside the module's junction box. When a battery string is blocked, the current bypasses the failed string, forming a circuit through the parallel bypass diode 160, thus protecting the string from burnout and ensuring the module still has some power output.

[0052] refer to Figure 2 The first surface 101 can be a backlight surface, and the second surface 102 can be a light-receiving surface, that is, the first surface 101 is away from the sunlight, and the second surface 102 faces the sunlight. The jumper 120 is located on the side of the reflective layer 1212 away from the solar cell 100. The jumper 120 will be blocked by the reflective layer 1212 from the light-receiving surface. The second light-trapping part 1112 is used to capture the incident light from the front of the photovoltaic module to the gap between the solar cells 100, and then reflect it through the reflective layer 1212 to be absorbed by the solar cells 100. The first light-trapping part 1111 is used to capture the incident light from the back of the photovoltaic module to the surface of the solar cells 100 and to be absorbed by the solar cells 100.

[0053] refer to Figure 3The first surface 101 can be a light-receiving surface, and the second surface 102 can be a backlighting surface, that is, the first surface 101 faces the sunlight, and the second surface faces away from the sunlight. The jumper 120 can be embedded in the reflective part 121, and the reflective layer 1212 wraps the jumper 120. The jumper 120 is blocked by the reflective layer 1212 on the light-receiving surface. The second light-trapping part 1112 is used to capture the incident light from the back of the photovoltaic module to the gap between the cells 100, and then reflect it through the reflective layer 1212 to be absorbed by the cells 100. The first light-trapping part 1111 is used to capture the incident light from the front of the photovoltaic module to the surface of the cells 100 and to be absorbed by the cells 100.

[0054] In the accompanying drawings provided in this embodiment, the first light-trapping portion 1111 and the second light-trapping portion 1112 are semi-circular in shape as an example. In other embodiments, the shape of the first light-trapping portion can also be conical, triangular pyramidal, or multi-faceted pyramidal; the shape of the second light-trapping portion can also be conical, triangular pyramidal, or multi-faceted pyramidal.

[0055] The first light-trapping portion 1111 and the second light-trapping portion 1112 can be formed by hot pressing. For example, a first hot pressing plate and a second hot pressing plate are provided. The first hot pressing plate has a first protrusion, which corresponds to the position of the first light-trapping portion 1111. The second hot pressing plate has a second protrusion, which corresponds to the position of the second light-trapping portion 1112. The separator 110 is sandwiched between the first hot pressing plate and the second hot pressing plate, heated, and then cooled and solidified to form the first light-trapping portion 1111 and the second light-trapping portion 1112 on the separator 110.

[0056] refer to Figures 4 to 7 The photovoltaic module may further include: an encapsulant film 130, which covers the second surface 102 and the surface of the separator 110 away from the solar cell 100. The encapsulant film 130 is filled in a first light-trapping portion 1111 and / or in a second light-trapping portion 1112. The encapsulant film 130 typically has high light transmittance to improve the light conversion efficiency of the photovoltaic module. Since the encapsulant film 130 is filled in the first light-trapping portion 1111 and / or the second light-trapping portion 1112, the surfaces of the encapsulant film 130 that contact the first light-trapping portion 1111 and / or the second light-trapping portion 1112 form a refractive surface, further providing a light refraction effect, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0057] In some embodiments, the melt flow index of the adhesive film 130 is greater than that of the release liner 110. This helps maintain the light-trapping shape of the first light-trapping portion 1111 and the second light-trapping portion 1112 during lamination, and the higher fluidity of the adhesive film 130 makes it easier to fill the first light-trapping portion 1111 and / or the second light-trapping portion 1112, thus avoiding the problem of air bubbles forming between the adhesive film 130 and the release liner 110.

[0058] Melt index, or melt flow index, refers to the weight of a melt passing through a standard capillary tube in ten minutes under specific temperature and pressure conditions, expressed in g / 10min. A higher melt flow index indicates better processing performance and flowability of the raw material; conversely, a lower melt flow index indicates poorer processing performance and flowability, but higher physical and mechanical properties. Melt flow index can be measured according to the GB / T 3682.1-2018 standard.

[0059] The material of the film 130 can be at least one of the following organic encapsulation films: ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyvinyl butyral (PVB) film.

[0060] The material of the separator 110 can be at least one of PET (polyethylene terephthalate), PI (polyimide) or PVF (polyvinyl fluoride).

[0061] refer to Figures 5 to 7 The photovoltaic module may further include light-trapping particles 131, which are filled in the first light-trapping portion 1111 and / or the second light-trapping portion 1112. Thus, the shape of the light-trapping particles 131 is the same as that of the first light-trapping portion 1111 and / or the second light-trapping portion 1112, forming a refractive surface facing the solar cell 100. The light-trapping particles 131 can be made of a high-refractive-index material, further improving the light-catching effect of the first light-trapping portion 1111 and / or the second light-trapping portion 1112, thereby improving the light absorption efficiency and photoelectric conversion efficiency of the photovoltaic module.

[0062] In some embodiments, the material of the light-trapping particles 131 includes at least one of polymethyl methacrylate, polystyrene, polycarbonate, or silicone.

[0063] In some embodiments, the light-trapping particles 131 can be embedded into the isolation membrane 110 by hot melting. For example, the isolation membrane 110 is added to a temperature above the melting temperature and the heating temperature is not higher than 10°C above the melting temperature of the isolation membrane 110 to melt the isolation membrane 110. After the light-trapping particles 131 are laid on the operating table, the isolation membrane 110 is pressed down onto the operating table so that the light-trapping particles 131 are embedded into the isolation membrane 110.

[0064] In some embodiments, the photovoltaic module may further include a cover plate located on the surface of the encapsulant film away from the solar cells. The cover plate may be a glass cover plate, a plastic cover plate, or other light-transmitting cover plate. The surface of the cover plate facing the encapsulant film may be an uneven surface, thereby increasing the utilization rate of incident light.

[0065] refer to Figure 2 or Figure 3Along the arrangement direction of the solar cells 100, the gap width between adjacent solar cells 100 is a first width W1, and the width of the reflective part 121 is a second width W2. The second width W2 is greater than or equal to the first width W1. In this way, the reflective part 121 is always exposed between the gaps of the solar cells 100, which helps to maintain the overall aesthetics of the photovoltaic module.

[0066] In some embodiments, along the arrangement direction of the battery cells 100, the difference between the second width W2 and the first width W1 is less than the width of the second light-trapping portion 1112. When the second light-trapping portion 1112 is not provided with light-trapping particles 131, the second light-trapping portion 1112 of the nearest neighboring battery cell 100 is partially blocked by the edge of the battery cell 100. In order for the adhesive film 130 to fully fill the second light-trapping portion 1112 of the nearest neighboring battery cell 100, the difference between the second width W2 and the first width W1 needs to be less than the width of the second light-trapping portion 1112, thereby avoiding the problem of air bubbles caused by the second light-trapping portion 1112 of the nearest neighboring battery cell 100 not being able to fill the adhesive film 130.

[0067] It should be noted that the width of the second light-trapping portion 1112 refers to the width of a single second light-trapping portion 1112.

[0068] In some embodiments, the width of the jumper wire 120 along the arrangement direction of the solar cells 100 is less than or equal to the width of the reflective portion 121. This ensures that the jumper wire 120 is located in the area shielded by the reflective layer 1212, preventing the jumper wire 120 from being exposed from the gaps between the solar cells 100 and improving the overall aesthetics of the photovoltaic module.

[0069] In some embodiments, the proportion of the projected area of ​​the first light-trapping portion 1111 on the first surface 101 is greater than the proportion of the projected area of ​​the second light-trapping portion 1112 on the first surface 101. Here, the projected area of ​​the first light-trapping portion 1111 on the first surface 101 refers to the projected area of ​​a single first light-trapping portion 1111 on the first surface 101, and the projected area of ​​the second light-trapping portion 1112 on the first surface 101 refers to the projected area of ​​a single second light-trapping portion 1112 on the first surface 101.

[0070] The first light-trapping portion 1111 is located on the surface of the solar cell 100. The area occupied by the solar cell 100 in the photovoltaic module is much larger than the area occupied by the gap between the solar cells 100 in the photovoltaic module. The projected area of ​​the first light-trapping portion 1111 is larger, which is beneficial to the fabrication of the first light-trapping portion 1111 while maintaining the first light-trapping portion 1111's good light-trapping effect. The projected area of ​​the second light-trapping portion 1112 is smaller, which is beneficial to setting more second light-trapping portions 1112 at the gap, so as to improve the light-trapping effect at the gap between the solar cells 100.

[0071] In some embodiments, the height of the first light-trapping portion 1111 along the direction perpendicular to the first surface 101 is greater than the height of the second light-trapping portion 1112 along the direction perpendicular to the first surface 101. The second light-trapping portion 1112 is disposed in the main body portion 1211 of the reflective portion 121, which also has a reflective layer 1212. The lower height of the second light-trapping portion 1112 can leave space for the reflective layer 1212. The first light-trapping portion 1111 is located on the surface of the solar cell 100, and its higher height is beneficial to improving the light refraction effect, thereby improving the light conversion efficiency of the photovoltaic module.

[0072] In some embodiments, the material of the reflective layer 1212 includes a resin matrix and reflective particles. For example, the resin matrix includes acrylic resin or phenolic resin, and the reflective particles include silicon dioxide, calcium oxide, barium oxide, or titanium dioxide.

[0073] refer to Figure 2 When the jumper 120 is located on the side of the reflective part 121 away from the battery cell 100, the thickness of the reflective layer 1212 can be less than the thickness of the jumper 120. For example, the reflective layer 1212 can be a reflective coating.

[0074] refer to Figure 3 When the jumper 120 is embedded in the reflective part 121, and the reflective layer 1212 wraps around the jumper 120, the thickness of the reflective layer 1212 needs to be greater than the thickness of the jumper 120 to avoid the jumper 120 being exposed.

[0075] In the photovoltaic module provided in this application embodiment, a separator 110 is provided on the first surface 101 of multiple solar cells 100. A jumper wire 120 is located on the side of the separator 110 away from the solar cells 100, which can prevent the jumper wire 120 from directly contacting the solar cells 100 or the solder ribbons on the solar cells 100, thus avoiding leakage and improving the reliability of the photovoltaic module. The separator 110 includes a light-transmitting portion 111 and a reflective portion 121. The reflective portion 121 is located between the solar cells 100 and is provided with a reflective layer 1212, which can reflect sunlight passing through the gaps between the solar cells 100, facilitating the solar cells 100 to reabsorb the reflected sunlight and improve the light utilization rate of the photovoltaic module. The reflective portion 121 can also shield the jumper wire 120, preventing the jumper wire 120 from being exposed on the first surface 101. The overall integrity of the portion of the reflective portion 121 without the jumper wire 120 and the portion with the jumper wire 120 is improved, enhancing the aesthetics of the photovoltaic module. The light-transmitting part 111 is provided with a first light-trapping part 1111, and the main body part 1211 is provided with a second light-trapping part 1112. In this way, more incident light from the gaps between the cells 100 on the first surface 101 can be reflected by the reflective part 121 and absorbed by the cells 100, and more incident light from the second surface 102 can be captured by the first light-trapping part 1111 and absorbed by the cells 100, thereby improving the light absorption efficiency of the cells 100 and thus improving the overall photoelectric conversion efficiency of the photovoltaic module.

[0076] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: The solar cell includes opposing first and second surfaces; A separator film covers the first surface of a plurality of battery cells. The separator film includes a light-transmitting portion and a reflective portion. The light-transmitting portion is located on the first surface, and the reflective portion is located between adjacent battery cells. The reflective portion includes a main body portion and a reflective layer, with the reflective layer located on the surface of the main body portion away from the battery cell. The light-transmitting portion includes a first light-trapping portion, which is recessed from the surface of the light-transmitting portion away from the battery cell towards the battery cell. The main body portion includes a second light-trapping portion, which is recessed from the surface of the reflective portion near the battery cell towards the direction away from the battery cell. A jumper wire is located on the side of the reflective part away from the battery cell.

2. The photovoltaic module according to claim 1, characterized in that, The shape of the first light-trapping part includes a semi-circle, a cone, a triangular pyramid, or a multi-faceted pyramid; the shape of the second light-trapping part includes a semi-circle, a cone, a triangular pyramid, or a multi-faceted pyramid.

3. The photovoltaic module according to claim 1 or 2, characterized in that, Also includes: Light-trapping particles are filled in the first light-trapping portion and / or the second light-trapping portion.

4. The photovoltaic module according to claim 3, characterized in that, The material of the light-trapping particles includes at least one of polymethyl methacrylate, polystyrene, polycarbonate, or silicone.

5. The photovoltaic module according to claim 1 or 2, characterized in that, Also includes: An adhesive film covering the second surface and the surface of the separator away from the battery cell, the adhesive film filling the first light-trapping portion, and / or, the adhesive film filling the second light-trapping portion.

6. The photovoltaic module according to claim 5, characterized in that, The melt flow index of the adhesive film is greater than that of the release liner.

7. The photovoltaic module according to claim 1, characterized in that, Along the arrangement direction of the battery cells, the gap width between adjacent battery cells is a first width, and the width of the reflective part is a second width, wherein the second width is greater than or equal to the first width.

8. The photovoltaic module according to claim 7, characterized in that, Along the arrangement direction of the battery cells, the width of the jumper is less than or equal to the width of the reflective portion.

9. The photovoltaic module according to claim 7, characterized in that, Along the arrangement direction of the battery cells, the difference between the second width and the first width is less than the width of the second light-trapping portion.

10. The photovoltaic module according to claim 1, characterized in that, The projected area of ​​the first light-trapping part on the first surface is greater than the projected area of ​​the second light-trapping part on the first surface.

11. The photovoltaic module according to claim 1 or 10, characterized in that, The height of the first light-trapping portion along the perpendicular surface is greater than the height of the second light-trapping portion along the perpendicular surface.

12. The photovoltaic module according to claim 1, characterized in that, The reflective layer is made of a resin matrix and reflective particles.

13. The photovoltaic module according to claim 1, characterized in that, The jumper is embedded in the reflective part, and the reflective layer wraps around the jumper.

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