Photovoltaic module
By setting a light conversion film to cover the passivation layer in photovoltaic modules, the problem of poor UV resistance of sliced solar cells is solved, thereby improving the photoelectric conversion efficiency and lifespan of photovoltaic modules.
Patent Information
- Application Number
- CN202520594189.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-17
- Estimated Expiration
- 2035-03-31
AI Technical Summary
In traditional photovoltaic modules, the passivation layer of the sliced solar cells has poor UV resistance, which affects the module's power and lifespan.
A light-converting film is disposed on the side of the passivation layer of the sliced solar cell. The side of the light-converting film extends to the surface of the sliced solar cell to cover the passivation layer. The light-converting film can convert ultraviolet light into visible light and cover the passivation layer, thereby increasing the light absorption range.
This improved the UV resistance of the sliced solar cells, enhanced photoelectric conversion efficiency, and extended the lifespan of the photovoltaic modules.
Smart Images
Figure CN224139389U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic cell technology, specifically to a photovoltaic module. Background Technology
[0002] With the development of the times and the increasing prominence of environmental problems, the drawbacks of fossil fuels are becoming more and more apparent. On the one hand, fossil fuels release large amounts of harmful gases during combustion, leading to air quality deterioration and posing a serious threat to human health; on the other hand, fossil fuels are non-renewable energy sources, and due to long-term large-scale exploitation and use by humans, they are gradually being depleted, facing a severe resource shortage problem.
[0003] Solar energy, as a new type of energy, has the advantages of being clean and pollution-free. A photovoltaic module is a device composed of multiple photovoltaic cells connected in series and parallel and encapsulated, which can directly convert solar energy into usable electrical energy.
[0004] Traditional photovoltaic (PV) modules typically use multiple whole solar cells connected by solder ribbons to form a string, but this still falls short of the demands of high-power PV modules. To improve module power, slicing technology has become a research hotspot. Currently, commercially available slicing modules are made by laser-cutting whole solar cells. However, current laser non-destructive cutting technology still causes damage to the cells. To reduce power loss, the cut surfaces of the laser-cut cells are passivated; however, even after passivation, the cut areas still exhibit poor UV resistance, affecting the module's power and lifespan. Utility Model Content
[0005] In view of this, the present invention provides a photovoltaic module that solves or at least alleviates one or more of the above-mentioned problems and other problems existing in the prior art.
[0006] To solve the above technical problems, the present invention adopts the following technical solution:
[0007] A photovoltaic module includes a battery string, the battery string including a plurality of sliced battery cells, and each sliced battery cell having a passivation layer on its cut surface;
[0008] The photovoltaic module also includes several light-converting films, which are disposed on the side of the passivation layer of the sliced solar cell, and the side of the light-converting film extends to the surface of the sliced solar cell to cover the passivation layer.
[0009] In the aforementioned photovoltaic module, optionally, when at least one of two adjacent sliced solar cells has the passivation layer on its side and the passivation layer faces the other sliced solar cell, the light-converting film is disposed between the two adjacent solar cells, and the side of the light-converting film extends to the surface of the sliced solar cell with the passivation layer to cover the passivation layer.
[0010] Optionally, when both sides of two adjacent sliced battery cells have the passivation layer, the opposite sides of the light-converting film extend to the surface of the two sliced battery cells to cover the passivation layer.
[0011] Optionally, when at least one of the outermost sliced solar cells in the photovoltaic module has the passivation layer on its outer surface, the light conversion film is disposed on the outside of the sliced solar cell with the passivation layer, and the side of the light conversion film extends to the surface of the sliced solar cell with the passivation layer to cover the passivation layer.
[0012] Optionally, the width of the light-converting film extending to the surface of the sliced battery cell is 1 to 5 mm.
[0013] Optionally, the light-converting film is an adhesive film capable of converting ultraviolet light into visible light.
[0014] Optionally, the light-converting film is made of EVA.
[0015] Optionally, the light-converting film is an adhesive film with a thickness of 0.5±0.1mm.
[0016] Optionally, the sliced battery cell can be a two-slice battery cell or a multi-slice battery cell.
[0017] In this invention, a two-slice battery cell refers to a sliced battery cell after the entire battery cell has been divided into two slices, either evenly or unevenly; a multi-slice battery cell refers to a sliced battery cell after the entire battery cell has been divided into multiple slices, such as three slices, four slices, six slices, or more slices.
[0018] Further optionally, the sliced battery cell is a half-cell battery cell, that is, a sliced battery cell after the entire battery cell has been divided into two equal pieces.
[0019] Optionally, the passivation layer is a silicon oxide passivation layer, a silicon nitride passivation layer, or an aluminum oxide passivation layer.
[0020] Optionally, the photovoltaic module further includes a backsheet, a lower encapsulating film, an upper encapsulating film, and a panel, which are laminated from bottom to top, and the battery string is encapsulated between the upper encapsulating film and the lower encapsulating film.
[0021] Optionally, the battery string has multiple layers, the panel is a glass panel, the back plate is a glass back plate, and the upper encapsulation film and the lower encapsulation film are EVA films.
[0022] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0023] The light conversion film of this photovoltaic module is used to cover the passivation layer, which greatly reduces the damage of ultraviolet light to the passivation layer, improves the ultraviolet resistance of the passivation treatment area of the sliced solar cells, and can also reuse some of the light that shines into the gap between two adjacent sliced solar cells, increasing the light absorption range of the photovoltaic module. This allows the ultraviolet energy that might otherwise be wasted to be utilized, which helps to improve the photoelectric conversion efficiency of the entire photovoltaic module, thereby increasing the power of the photovoltaic module and extending its service life. Attached Figure Description
[0024] The disclosure of this utility model will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.
[0025] Figure 1 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present invention;
[0026] Figure 2 for Figure 1 A top view of the photovoltaic module without the light conversion film.
[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0028] Figure 4 for Figure 1 A top view of the photovoltaic module structure;
[0029] Figure 5 for Figure 4 Enlarged diagram of point B in the middle.
[0030] Figure label:
[0031] 1. Backsheet; 2. Lower encapsulation film; 3. Battery string; 31. Sliced battery cell; 32. Light conversion film; 4. Upper encapsulation film; 5. Panel. Detailed Implementation
[0032] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the photovoltaic module of this utility model will be described below by way of example; however, all descriptions should not be construed as limiting the present utility model in any way.
[0033] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various drawings, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, and thus it should be considered that these further embodiments according to the present invention are also within the scope of the description herein.
[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0035] It should also be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship of the various parts of the photovoltaic module of this utility model shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.
[0036] Figure 1 This is a schematic diagram of the structure of one embodiment of the photovoltaic module of this utility model.
[0037] like Figure 1 As shown, the photovoltaic module includes a backsheet 1, a lower encapsulating film 2, a battery string 3, an upper encapsulating film 4, and a panel 5, which are stacked sequentially from bottom to top.
[0038] In some alternative embodiments, there are multiple battery strings 3, which are encapsulated in a lower encapsulation film 2 and an upper encapsulation film 4. The multiple battery strings 3 are arranged side by side, and each battery string 3 includes a plurality of sliced battery cells connected in series.
[0039] In some embodiments, the sliced battery cell is a half-cell battery cell formed by laser averaging of a whole battery cell. Several sliced battery cells in each battery string 3 are connected in series and arranged along the direction of the short side of the half-cell battery cell. The specific arrangement of the multiple battery strings 3 refers to the arrangement of the prior art.
[0040] In some alternative embodiments, the sliced battery cell can also be a multi-slice battery cell, which is a sliced battery cell formed by cutting a whole battery cell into multiple slices, either evenly or non-evenly, such as a three-slice battery cell, a four-slice battery cell, a six-slice battery cell, or more battery cells, etc.
[0041] After laser scribing, the cut surfaces of the solar cells can be passivated by applying a passivation layer. This passivation layer effectively reduces the surface state density, thereby improving the performance of the solar cells. However, the passivated surfaces of the solar cells still have poor UV resistance. Ultraviolet rays in sunlight can damage the passivation layer, causing the passivation effect to gradually weaken, which in turn affects the power generation efficiency and lifespan of the solar cells.
[0042] In some embodiments, the passivation layer disposed on the cut surface of each sliced solar cell may be a silicon oxide passivation layer, a silicon nitride passivation layer, or an aluminum oxide passivation layer. Passivation methods include, but are not limited to, thermal oxidation passivation and dielectric film passivation.
[0043] While the passivation layer can improve the conversion efficiency of the sliced solar cells to some extent, it still has poor UV resistance, affecting the power and lifespan of the module. To further improve the power and lifespan of the photovoltaic module, the photovoltaic module also includes several light conversion films for covering the passivation layer. The light conversion films are set on the side of the passivation layer of the sliced solar cells, and the side of the light conversion films extends to the surface of the sliced solar cells to cover the passivation layer. The light conversion films can convert ultraviolet light into visible light, greatly reducing or even avoiding the passivation layer from being exposed to ultraviolet light.
[0044] For the installation method of the light conversion film in the entire photovoltaic module, please refer to [reference needed]. Figures 2 to 5 ,in, Figure 2 and Figure 3 This is a top view and a partial enlarged view of the photovoltaic module in this example without the light conversion film. Figure 4 and Figure 5 This is a top view and a partial enlarged view of the photovoltaic module in this example.
[0045] When at least one of two adjacent sliced battery cells 31 has a passivation layer on its side surface, and the passivation layer faces the other sliced battery cell 31, a light-converting film 32 is disposed between the two adjacent sliced battery cells 31, and the side edge of the light-converting film 32 extends to the surface of the sliced battery cell 31 with the passivation layer to cover the passivation layer. When both sides of two adjacent sliced battery cells 31 have passivation layers, and the passivation layer of each sliced battery cell faces the other sliced battery cell, the opposite sides of the light-converting film extend to the surface of the two sliced battery cells 31 respectively to cover the passivation layer.
[0046] When at least one of the multiple outermost sliced solar cells 31 in a photovoltaic module has a passivation layer on its outer surface, a light-converting film is provided on the outer side of the sliced solar cell with the passivation layer, and the side of the light-converting film extends to the surface of the sliced solar cell with the passivation layer to cover the passivation layer.
[0047] The light conversion film 32 not only covers the passivation layer to reduce the damage of ultraviolet light to the passivation layer, but also reuses the light that shines on the gap between two adjacent solar cells and the light that shines on the side edge of the photovoltaic module. This increases the light absorption range of the photovoltaic module to a certain extent, making use of the ultraviolet energy that might otherwise be wasted. This helps to improve the photoelectric conversion efficiency of the entire photovoltaic module and thus increase the power of the photovoltaic module.
[0048] In the photovoltaic module production process, the light conversion film is laid at the gap between all the sliced solar cells after all the sliced solar cells have been laid to the lower encapsulation film and welded. Then, the upper encapsulation film and the panel are laid, and the photovoltaic module is then laminated.
[0049] In some embodiments, the width of the light-converting film extending to the surface of the sliced battery cell is 1 to 5 mm, and can be any value between 2 and 5 mm.
[0050] In some embodiments, the light conversion film 32 is a commercially available EVA film with a thickness of, for example, 0.5 ± 0.1 mm.
[0051] The lower encapsulating film 2 and the upper encapsulating film 4 can also be EVA films. In this way, the light conversion film 32 and the encapsulating film have good compatibility, avoiding the use of the light conversion film 32 from affecting the encapsulation effect of the module. The panel 5 can be a glass panel, and the back sheet 1 can also be a glass back sheet. The glass panel has high light transmittance, allowing sunlight to reach the sliced solar cells through the glass to the maximum extent, so that the sliced solar cells can fully absorb light energy and convert light energy into electrical energy.
[0052] In some embodiments, the photovoltaic module further includes a photovoltaic frame for encapsulating a backsheet, a panel, and components between the backsheet and the panel, thereby enhancing the strength of the module and facilitating transportation, installation, and protection of the photovoltaic module.
[0053] The above are merely exemplary embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered to fall within the protection scope of this utility model.
Claims
1. A photovoltaic module comprising a string of cells, characterized in that, The battery string includes several sliced battery cells, and each sliced battery cell has a passivation layer on its cut surface; The photovoltaic module also includes several light-converting films, which are disposed on the side of the passivation layer of the sliced solar cell, and the side of the light-converting film extends to the surface of the sliced solar cell to cover the passivation layer.
2. The photovoltaic module of claim 1, wherein, When at least one of two adjacent sliced battery cells has the passivation layer on its side and the passivation layer faces the other sliced battery cell, the light-converting film is disposed between the two adjacent sliced battery cells, and the side of the light-converting film extends to the surface of the sliced battery cell with the passivation layer to cover the passivation layer.
3. The photovoltaic module of claim 2, wherein, When both sides of two adjacent sliced battery cells have the passivation layer, the opposite sides of the light-converting film extend to the surface of the two sliced battery cells to cover the passivation layer.
4. The photovoltaic module of claim 2, wherein, When at least one of the outermost sliced solar cells in the photovoltaic module has the passivation layer on its outer surface, the light conversion film is disposed on the outer side of the sliced solar cell with the passivation layer, and the side of the light conversion film extends to the surface of the sliced solar cell with the passivation layer to cover the passivation layer.
5. The photovoltaic module of claim 2 or 4, wherein, The width of the light-converting film extending to the surface of the sliced battery cell is 1–5 mm.
6. The photovoltaic module of claim 1, wherein, The light-converting film is a film capable of converting ultraviolet light into visible light.
7. The photovoltaic module of claim 6, wherein, The light-converting film is made of EVA.
8. The photovoltaic module of claim 1, wherein, The sliced battery cell is a two-slice battery cell or a multi-slice battery cell; and / or, The passivation layer is a silicon oxide passivation layer, a silicon nitride passivation layer, or an aluminum oxide passivation layer; and / or, The photovoltaic module also includes a backsheet, a lower encapsulating film, an upper encapsulating film, and a panel, which are laminated from bottom to top, and the battery string is encapsulated between the upper encapsulating film and the lower encapsulating film.
9. The photovoltaic module of claim 8, wherein, The sliced battery cell is a half-cell battery cell.
10. The photovoltaic module of claim 8, wherein, The battery string has multiple layers, the panel is a glass panel, the back plate is a glass back plate, and the upper and lower encapsulation films are EVA films.