Photovoltaic module
By bonding a reflective film on the back of the cover plate of the photovoltaic module, the light is reflected to the front of the cell, which solves the problem of low light utilization and increases the frontal power of the photovoltaic module.
Patent Information
- Application Number
- CN202421158074.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-24
AI Technical Summary
In existing photovoltaic modules, some light cannot illuminate the front of the cell and directly passes through the gap between adjacent cells, resulting in low light utilization, and light needs to pass through two layers of packaging film to lose, reducing the frontal power of the cell.
Adhesive a reflective film on the back of the cover plate to reflect light to the front of the cell to avoid loss when the light passes through the gap and increase the light utilization rate.
By reflecting light to the front of the cell, the light utilization rate of the photovoltaic module and the frontal power of the cell are improved.
Smart Images
Figure CN222366567U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of photovoltaic cells, and in particular relates to a photovoltaic component. Background Art
[0002] Photovoltaic modules are the core part of solar power generation systems, and their function is to convert solar energy into electrical energy. The structure of a photovoltaic module from bottom to top is a backplane, a first encapsulation film, a plurality of array-distributed cells, a second encapsulation film, and a cover plate. The cover plate is usually made of transparent glass, which can be exposed to light such as sunlight in outdoor environments to provide solar energy for the photovoltaic module. The backplane can be transparent glass or an opaque backplane.
[0003] In order to enhance the absorption and utilization of light by the cell, the existing solution is to place a reflective film on the back panel to reflect the light to the back of the cell. This solution has the following defects:
[0004] 1. Some light cannot illuminate the front of the cell and directly passes through the gap between adjacent cells, resulting in low light utilization and low front power of the cell;
[0005] 2. The light that directly passes through the gap between adjacent solar cells needs to pass through two layers of packaging film before reaching the reflective film, which causes a certain loss of light and reduces the utilization rate of light.
[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0007] The utility model aims to provide a photovoltaic module, which can reflect light to the front side of a cell, thereby increasing the utilization rate of light and improving the front power of the photovoltaic module.
[0008] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:
[0009] A photovoltaic module, comprising a backplane, a first packaging film, a plurality of array-distributed cells, a second packaging film and a cover plate stacked in sequence, with gaps between adjacent cells. The photovoltaic module also comprises a reflective film bonded to the back of the cover plate, wherein the reflective film is at least partially located above the gap, and is configured to reflect all or part of the light irradiated on the reflective film to the front of the cell via the cover plate.
[0010] In one or more embodiments of the present invention, a first gap is provided between two connected groups of battery cells in a first direction, a second gap is provided between two adjacent groups of battery cells in a second direction, and the reflective film includes a first reflective film at least partially located above the first gap and a second reflective film at least partially located above the second gap.
[0011] In one or more embodiments of the present invention, the first reflective films are arranged in intervals along a first direction, and the second reflective films are arranged through along a second direction and are located between two adjacent first reflective films; or,
[0012] The second light reflecting films are arranged in an interval manner along the second direction, and the first light reflecting films are arranged in a penetrating manner along the first direction and are located between two adjacent second light reflecting films.
[0013] In one or more embodiments of the present invention, the width of the first reflective film is greater than or equal to the width of the first gap; and / or,
[0014] The width of the second reflective film is greater than or equal to the width of the second gap.
[0015] In one or more embodiments of the present invention, the first reflective film is symmetrically distributed along the center line of the first gap, and the difference between the width of the first reflective film and the width of the first gap is 1 mm to 2 mm; and / or,
[0016] The second reflective film is symmetrically distributed along the center line of the second gap, and the difference between the width of the second reflective film and the width of the second gap is 1 mm to 2 mm.
[0017] In one or more embodiments of the present invention, the photovoltaic assembly further includes a bus bar, the bus bar is located between two adjacent solar cells along the first direction, and the reflective film further includes a third reflective film at least partially located above the bus bar.
[0018] In one or more embodiments of the present invention, the width of the third reflective film is greater than or equal to the width of the third bus bar.
[0019] In one or more embodiments of the present invention, a third gap is provided between the edge of the cover plate and the battery cell, and the reflective film further includes a fourth reflective film at least partially located above the third gap.
[0020] In one or more embodiments of the present invention, the width of the fourth reflective film is greater than or equal to the width of the third gap.
[0021] In one or more embodiments of the present invention, the reflective film includes an adhesive layer, a base layer, and a reflective layer stacked in sequence, the adhesive layer is bonded to the back of the cover plate, and the reflective layer includes a reflective surface arranged toward the cover plate; and / or,
[0022] The reflective film is a non-metallic film; and / or,
[0023] The thickness of the reflective film is smaller than the thickness of the second packaging film.
[0024] Compared with the prior art, the utility model has the following beneficial effects:
[0025] The utility model provides a photovoltaic module, which, by arranging a reflective film bonded to the back of a cover plate, reflects all or part of the light irradiated on the reflective film to the front of a cell sheet through the cover plate, thereby increasing the utilization rate of light and improving the front power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 This is a schematic cross-sectional structural diagram of a photovoltaic module in Embodiment 1 of the present utility model;
[0028] Figure 2 This is a schematic diagram of the structure of the reflective film in the first embodiment of the utility model;
[0029] Figure 3 This is a schematic diagram of the structure of the battery cell and the reflective film in the first embodiment of the utility model;
[0030] Figure 4 This is a schematic structural diagram of a cover plate and a first reflective film in Embodiment 1 of the present utility model;
[0031] Figure 5 This is a schematic diagram of the structure of the cover plate and the reflective film in the first embodiment of the utility model;
[0032] Figure 6 This is a schematic diagram of the structure of the cover plate and the second reflective film in the second embodiment of the present utility model;
[0033] Figure 7 This is a schematic diagram of the structure of the cover plate and the reflective film in the second embodiment of the utility model;
[0034] Figure 8This is a schematic diagram of the structure of the cover plate and the reflective film in the third embodiment of the present utility model. DETAILED DESCRIPTION
[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0038] It should be noted that the “first direction” in this application text is the Figure 2 The x-axis in the figure is marked with the direction of the second direction. Figure 2 The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0039] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.
[0040] Embodiment 1:
[0041] Reference Figure 1As shown, the photovoltaic module in this embodiment includes a back sheet 1, a first packaging film 2, a plurality of array-distributed cells 3, a second packaging film 4 and a cover plate 5 which are stacked in sequence, and there is a gap 30 between adjacent cells 3. The photovoltaic module also includes a reflective film 6 bonded to the back of the cover plate 5, and the reflective film 6 is at least partially located above the gap 30. The reflective film 6 is configured to reflect all or part of the light irradiated on the reflective film 6 to the front of the cell 3 via the cover plate 5. By bonding the reflective film 6 to the back of the cover plate 5, the light that should originally irradiate the gap 30 between two adjacent cells 3 is irradiated on the reflective film 6, reflected to the cover plate 5 through the reflective film 6, and then reflected to the front of the cell 3 via the cover plate 5, thereby avoiding the light loss caused by the light that should originally pass through the gap 30 between two adjacent cells 3 passing through two layers of packaging films, thereby increasing the utilization rate of light and improving the front power of the photovoltaic module. The light may be the light directly irradiated onto the reflective film 6 , or may be the light reflected by other external structures and refracted by the cover plate before irradiating onto the reflective film 6 .
[0042] Specifically, refer to Figure 2 Combined with Figure 1 As shown, the reflective film 6 in this embodiment includes an adhesive layer 601, a base layer 602, and a reflective layer 603 stacked in sequence, the adhesive layer 601 is bonded to the back of the cover plate 5, and the reflective layer 603 includes a reflective surface 6031 disposed toward the cover plate 5. When light is irradiated on the reflective surface 6031 of the reflective layer 603, the light can be reflected into the cover plate 5 through the reflective surface 6031, and then reflected to the front of the battery cell 3 through the cover plate 5.
[0043] Reference Figure 3 As shown, in this embodiment, a first gap 301 is provided between two connected groups of battery cells 3 in the first direction, a second gap 302 is provided between two adjacent groups of battery cells 3 in the second direction, and the reflective film 6 includes a first reflective film 61 at least partially located above the first gap 301 and a second reflective film 62 at least partially located above the second gap 302. According to this design, the light originally directly incident in the first gap 301 and the second gap 302 can be reflected to the front of the battery cell 3 through the first reflective film 61 and the second reflective film 62 and the cover plate 5.
[0044] In order to prevent the first reflective film 61 and the second reflective film 62 from overlapping, to prevent the thickness of the entire reflective film 6 from being inconsistent, and to prevent the laminated photovoltaic module from having the cell 3 cracked, refer to Figure 4 As shown, in this embodiment, the first reflective films 61 are arranged in an interval manner along the first direction, and the second reflective films 62 are arranged in a penetrating manner along the second direction and are located between two adjacent first reflective films 61 .
[0045] In order to reflect as much light as possible directly to the area where the first gap 301 is located to the front of the solar cell 3, the width of the first reflective film 61 in this embodiment is greater than or equal to the width of the first gap 301. Figure 3 As shown, preferably, the first reflective film 61 in this embodiment is symmetrically distributed along the midline of the first gap 301, and the difference between the width of the first reflective film 61 and the width of the first gap 301 is 1 mm to 2 mm, so that the first reflective film 61 completely covers the top of the first gap 301 to reflect the light directly incident on the area where the first gap 301 is located to the front of the battery cell 3.
[0046] In order to reflect as much light as possible that is directly incident on the second gap 302 to the front of the cell 3, the width of the second reflective film 62 is greater than or equal to the width of the second gap 302. Figure 3 As shown, preferably, the second reflective film 62 is symmetrically distributed along the center line of the second gap 302, and the difference between the width of the second reflective film 62 and the width of the second gap 302 is 1 mm to 2 mm, so that the second reflective film 62 completely covers the top of the second gap 302 to reflect the light directly incident on the area where the second gap 302 is located to the front of the battery cell 3.
[0047] Preferably, refer to Figure 5 As shown, the photovoltaic module in this embodiment further includes a bus bar, which is located between two adjacent cells 3 along the first direction, and the reflective film 6 further includes a third reflective film 63 located at least partially above the bus bar. Since the photovoltaic module is provided with a junction box, which is arranged on the back plate 1 and connected to the bus bar, when the third reflective film 63 located above the bus bar is provided, the light that would otherwise irradiate the bus bar can be reflected to the front of the cell 3, further increasing the utilization rate of light and improving the front power of the photovoltaic module.
[0048] In order to reflect as much light as possible that would otherwise irradiate the bus bar to the front side of the solar cell 3 , the width of the third reflective film 63 in this embodiment is greater than or equal to the width of the third bus bar.
[0049] Preferably, refer to Figure 5 As shown, in this embodiment, there is a third gap 30 between the edge of the cover plate 5 and the cell 3, and the reflective film 6 further includes a fourth reflective film 64 at least partially located above the third gap 30. By providing the fourth reflective film 64, the light directly incident on the area where the third gap 30 is located can be reflected to the front of the cell 3, further increasing the utilization rate of light and improving the front power of the photovoltaic module.
[0050] In order to reflect as much light as possible that would otherwise be irradiated on the area where the third gap 30 is located to the front side of the solar cell 3 , the width of the fourth reflective film 64 in this embodiment is greater than or equal to the width of the third gap 30 .
[0051] Preferably, the photovoltaic module includes a welding strip located in the gap 30 between the cells 3. Since the reflective film 6 in this embodiment is a non-metallic film, the risk of leakage caused by piercing of the welding strip can be reduced.
[0052] In order to better package the battery cell 3, refer to Figure 1 As shown, the thickness of the reflective film 6 in this embodiment is less than the thickness of the second packaging film 4 , so that the second packaging film 4 is provided between the front side of the battery cell 3 and the back side of the reflective film 6 .
[0053] Embodiment 2:
[0054] The back plate 1, the first packaging film 2, the battery cell 3, the second packaging film 4 and the cover plate 5 in this embodiment are exactly the same as the back plate 1, the first packaging film 2, the battery cell 3, the second packaging film 4 and the cover plate 5 in the first embodiment. The difference lies in the different structures of the first reflective film 61 and the second reflective film 62.
[0055] Reference Figure 6 , Figure 7 As shown, in this embodiment, the second reflective films 62 are arranged in an interval manner along the second direction, and the first reflective films 61 are arranged in a through manner along the first direction and are located between two adjacent second reflective films 62, so that there is no overlapping area between the first reflective films 61 and the second reflective films 62, thereby avoiding inconsistent thickness of the entire reflective film 6 and preventing the possibility of cell 3 cracking in the laminated photovoltaic module.
[0056] Embodiment three:
[0057] The back plate 1, the first packaging film 2, the battery cell 3, the second packaging film 4 and the cover plate 5 in this embodiment are exactly the same as the back plate 1, the first packaging film 2, the battery cell 3, the second packaging film 4 and the cover plate 5 in the first embodiment. The difference lies in the different structures of the first reflective film 61 and the second reflective film 62.
[0058] Reference Figure 8 As shown, the first reflective film 61 and the second reflective film 62 in this embodiment are both arranged in a through-type manner, which saves the time of bonding the first reflective film 61 and the second reflective film 62 to the cover plate 5, thereby reducing the manufacturing time of the photovoltaic module.
[0059] It can be seen from the above technical solutions that the utility model has the following beneficial effects:
[0060] The utility model provides a photovoltaic module, which, by arranging a reflective film bonded to the back of a cover plate, reflects all or part of the light irradiated on the reflective film to the front of a cell sheet through the cover plate, thereby increasing the utilization rate of light and improving the front power of the photovoltaic module.
[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A photovoltaic module, characterized in that: The photovoltaic module includes a back panel, a first packaging film, a plurality of array-distributed cells, a second packaging film and a cover plate stacked in sequence, with gaps between adjacent cells. The photovoltaic module also includes a reflective film bonded to the back of the cover plate, the reflective film is at least partially located above the gap, and the reflective film is configured to reflect all or part of the light irradiated on the reflective film to the front of the cell via the cover plate.
2. The photovoltaic module according to claim 1, characterized in that: A first gap is provided between two connected groups of battery cells in a first direction, a second gap is provided between two adjacent groups of battery cells in a second direction, and the reflective film includes a first reflective film at least partially located above the first gap and a second reflective film at least partially located above the second gap.
3. The photovoltaic module according to claim 2, characterized in that: The first reflective films are arranged in an interval manner along a first direction, and the second reflective films are arranged in a penetrating manner along a second direction and are located between two adjacent first reflective films; or, The second light reflecting films are arranged in an interval manner along the second direction, and the first light reflecting films are arranged in a penetrating manner along the first direction and are located between two adjacent second light reflecting films.
4. The photovoltaic module according to claim 2, characterized in that: The width of the first reflective film is greater than or equal to the width of the first gap; and / or, The width of the second reflective film is greater than or equal to the width of the second gap.
5. The photovoltaic module according to claim 4, characterized in that: The first reflective film is symmetrically distributed along the center line of the first gap, and the difference between the width of the first reflective film and the width of the first gap is 1 mm to 2 mm; and / or, The second reflective film is symmetrically distributed along the center line of the second gap, and the difference between the width of the second reflective film and the width of the second gap is 1 mm to 2 mm.
6. The photovoltaic module according to claim 2, characterized in that: The photovoltaic assembly further includes a bus bar, which is located between two adjacent solar cells along the first direction. The reflective film further includes a third reflective film which is at least partially located above the bus bar.
7. The photovoltaic module according to claim 6, characterized in that: The width of the third reflective film is greater than or equal to the width of the third bus bar.
8. The photovoltaic module according to claim 2, characterized in that: There is a third gap between the edge of the cover plate and the battery cell, and the reflective film further includes a fourth reflective film at least partially located above the third gap.
9. The photovoltaic module according to claim 8, characterized in that: The width of the fourth light reflecting film is greater than or equal to the width of the third gap.
10. The photovoltaic module according to claim 1, characterized in that: The reflective film comprises an adhesive layer, a base layer, and a reflective layer stacked in sequence, the adhesive layer is bonded to the back side of the cover plate, and the reflective layer comprises a reflective surface arranged toward the cover plate; and / or, The reflective film is a non-metallic film; and / or, The thickness of the reflective film is smaller than the thickness of the second packaging film.