Cover plate for photovoltaic module, photovoltaic module and photovoltaic power generation system with same
By designing grooves that gradually increase cross-sectional area on the cover plate of the photovoltaic module, the problem of uneven light illumination on the surface of the battery is solved, the photoelectric conversion efficiency and production efficiency of the photovoltaic module are improved, and the service life is extended.
Patent Information
- Application Number
- CN202323300673.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-05
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2033-12-05
AI Technical Summary
The existing photovoltaic module cover plates cause uneven light exposure on the surface of the cell, reducing the photoelectric conversion efficiency of the photovoltaic module.
A cover plate for photovoltaic modules is designed, which forms grooves extending in a vertical direction on one side surface of the body. The cross-sectional area of the grooves gradually increases, increasing the refractive index of light, and allowing light to be in the cell string layer. The coverage area is wider to ensure that all parts are evenly exposed to light.
Through the offset and dispersion of light, the photoelectric conversion efficiency of photovoltaic modules is improved, and the production efficiency and service life are optimized.
Smart Images
Figure CN222339892U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic components, in particular to a cover plate for a photovoltaic component, a photovoltaic component and a photovoltaic power generation system having the same. Background Art
[0002] At present, solar photovoltaic modules mainly use photovoltaic coated glass as the cover plate, and the material of the cover plate is ultra-white embossed coated tempered glass. When the light shines on and passes through the cover plate, the light will enter the cell. Among them, the light usually shines vertically on the cover plate. According to the principle of light refraction, about 8% of the light will be reflected and about 91% of the light will be projected vertically onto the cell. However, the above-mentioned cover plate causes the surface of the cell to not be evenly illuminated by light, so that the cell cannot fully utilize the light, reducing the photoelectric conversion efficiency of the photovoltaic module. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a cover plate for a photovoltaic module, which increases the coverage area of light in the battery string layer, so that each part of the battery string layer can be fully irradiated by light, so that each part of the battery string layer can be fully utilized, and the photoelectric conversion efficiency of the photovoltaic module is improved.
[0004] Another object of the present invention is to provide a photovoltaic module using the above-mentioned cover plate for photovoltaic modules.
[0005] Another object of the present invention is to provide a photovoltaic power generation system using the above photovoltaic assembly.
[0006] According to the first aspect of the present invention, a cover plate for a photovoltaic module includes: a main body, at least one groove is formed on at least one side surface of the main body in a first direction, the groove extends along a second direction, and the first direction is perpendicular to the second direction; wherein in the first direction, the cross-sectional area of the groove gradually increases in a direction away from the main body.
[0007] According to the cover plate for photovoltaic modules of the embodiment of the utility model, a groove is formed on at least one side surface of the cover plate body in the first direction, so that after the light is irradiated onto the body and passes through the body, the angle of the light can be offset. Therefore, compared with the cover plate of the traditional photovoltaic module, the coverage area of the light on the battery string layer is increased, so that each part of the battery string layer can be fully irradiated by the light, so that each part of the battery string layer can be fully utilized, and the photoelectric conversion efficiency of the photovoltaic module is improved.
[0008] According to some embodiments of the present invention, a side surface of a portion of the body in the first direction is recessed toward the center of the body to form the groove, and the shape of the groove is arc.
[0009] According to some embodiments of the present invention, a depth of the groove in the first direction is D1, and D1 satisfies: 0.1 mm≤D1≤2.0 mm.
[0010] According to some embodiments of the present invention, there are a plurality of grooves, and the plurality of grooves are evenly spaced apart along the third direction.
[0011] According to some embodiments of the present invention, the number of the grooves is ɑ, wherein the ɑ satisfies: 2≤ɑ≤50.
[0012] According to some embodiments of the present invention, the width of each of the grooves in the third direction is W1, wherein W1 satisfies: 0.1 mm≤W1≤5.0 mm.
[0013] According to some embodiments of the present invention, the thickness of the body in the first direction is D2, the width of the body in the third direction is W2, and the length of the body in the second direction is L2, wherein D2, W2 and L2 respectively satisfy: 0.6mm≤D2≤10mm, 300mm≤W2≤5000mm, 300mm≤L2≤5000mm.
[0014] According to some embodiments of the present invention, the refractive index of the body is γ, wherein the γ satisfies: 1%≤γ≤4%.
[0015] A photovoltaic module according to an embodiment of the second aspect of the utility model comprises: a battery string layer; a cover plate, wherein the cover plate is arranged on one side of the battery string layer in the thickness direction, and at least part of the grooves of the cover plate are located on the side surface of the cover plate away from the battery string layer, and the cover plate is a cover plate for a photovoltaic module according to an embodiment of the first aspect of the utility model; and a back plate, wherein the back plate is arranged on the other side of the battery string layer in the thickness direction.
[0016] A photovoltaic power generation system according to an embodiment of the third aspect of the utility model includes a photovoltaic component according to an embodiment of the second aspect of the utility model.
[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0019] Figure 1 is a schematic diagram of a cover plate according to an embodiment of the utility model;
[0020] Figure 2 is a schematic diagram of a cover plate according to another angle of an embodiment of the utility model;
[0021] Figure 3 Schematic diagram of the groove of the body according to an embodiment of the utility model
[0022] Figure 4 It is a schematic diagram of a photovoltaic assembly according to an embodiment of the utility model.
[0023] Reference numerals:
[0024] 100. Photovoltaic modules;
[0025] 1. Cover plate; 10. Main body; 11. Groove; 2. Battery string layer; 3. Back plate. DETAILED DESCRIPTION
[0026] Reference below Figure 1-Figure 4 A cover plate 1 for a photovoltaic assembly 100 according to an embodiment of the first aspect of the utility model is described.
[0027] like Figure 1-Figure 4 As shown, according to the cover plate 1 for a photovoltaic assembly 100 according to the first embodiment of the utility model, the cover plate 1 includes a body 10. The first direction of the body 10 (for example, Figure 2 At least one groove 11 is formed on at least one side surface of the first direction (for example, the vertical direction in the second direction). Figure 1 The first direction extends in the vertical direction (in the vertical direction), and the first direction is perpendicular to the second direction. In the first direction, the cross-sectional area of the groove 11 gradually increases in the direction away from the body 10. In the first direction, the groove 11 can be formed only on one side of the body 10 in the first direction. Alternatively, the groove 11 can be formed on both side surfaces of the body 10 in the first direction.
[0028] For example, in Figure 1-Figure 4In the example, the groove 11 can be formed by a partial surface depression on one side of the main body 10 in the first direction. Since the cross-sectional area of the groove 11 gradually increases in the direction away from the main body 10 in the first direction, it means that the inner wall of the groove 11 is an inclined inner wall, and the main body 10 has a refractive property. When light is irradiated on the inner wall of the groove 11, the light will not be reflected according to the original incident path, but the light will pass through the inner wall of the groove 11 and refract, that is, the path of the light after passing through the cover plate 1 will deviate from the original incident path of the light, so that the propagation path of the light will be dispersed, so that part of the light can be directed to the edge position of the battery string layer 2, increasing the coverage area of the light in the battery string layer 2, and then making each part of the battery string layer 2 fully exposed to the light, the entire battery string layer 2 can perform photoelectric conversion, and the photoelectric conversion efficiency of the photovoltaic module 100 is improved.
[0029] According to the cover plate 1 for the photovoltaic module 100 of the embodiment of the utility model, a groove 11 is formed on at least one side surface of the first direction of the body 10 of the cover plate 1, so that after the light is irradiated onto the body 10 and passes through the body 10, the propagation path of the light will be offset. Therefore, compared with the cover plate of the traditional photovoltaic module, the coverage area of the light on the battery string layer 2 is increased, so that each part of the battery string layer 2 can be fully irradiated by the light, so that each part of the battery string layer 2 can be fully utilized, and the photoelectric conversion efficiency of the photovoltaic module 100 is improved.
[0030] According to some embodiments of the present invention, a surface of one side of a portion of the body 10 in the first direction is concave toward the center of the body 10 to form a groove 11, and the shape of the groove 11 is an arc. Figure 1-Figure 3 The cross-section of the groove 11 is semicircular, so the portion of the body 10 that forms the groove 11 is similar to a concave lens. When light irradiates and passes through the body 10, the light will deviate from the incident path, that is, a beam of light will be emitted toward the battery string layer 2 in a divergent state after passing through the body 10, and part of the light will also be incident on the edge of the battery string layer 2 at a certain angle, so that the battery string layer 2 can fully receive the light, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.
[0031] According to some embodiments of the present invention, the depth of the groove 11 in the first direction is D1, and D1 satisfies: 0.1 mm ≤ D1 ≤ 2.0 mm. Figure 2As shown, when the depth of the groove 11 in the first direction is less than 0.1mm, the depth of the groove 11 is too small. When the light is irradiated on the body 10, the refractive index of the body 10 for the light is low, and the path of the light after refraction is small, which will still cause no light to be irradiated on part of the battery string layer 2, thereby reducing the photoelectric conversion efficiency of the battery string layer 2. When the depth of the groove 11 in the first direction is greater than 2.0mm, the depth of the groove 11 is too deep. When the light is irradiated on the body 10, the refractive index of the body 10 for the light is large, and the path of the light after refraction is far, which will cause most of the light to be directed to the edge of the battery string layer 2, while the middle of the battery string layer 2 receives less light, which also reduces the photoelectric conversion efficiency of the battery string layer 2. Therefore, the depth of the groove 11 in the first direction satisfies 0.1mm≤D1≤2.0mm, so that the light can be evenly irradiated on the battery string layer 2, improving the photoelectric conversion efficiency of the battery string layer 2, and then improving the photoelectric conversion efficiency of the photovoltaic module 100.
[0032] According to some embodiments of the present invention, there are multiple grooves 11. In the description of the present invention, "multiple" means two or more. The multiple grooves 11 are arranged along the third direction (for example, Figure 1 The third direction is perpendicular to both the first direction and the second direction. Figure 1 and Figure 2 In the example, the number of the grooves 11 is 5, and the 5 grooves 11 are arranged at intervals along the third direction on the body 10. With such a configuration, when light is irradiated onto the body 10, most of the light can be projected into the grooves 11, so that the light irradiated into the grooves 11 can be refracted, so that when the light passes through the body 10 and projects toward the battery string layer 2, it can project toward the edge of the battery string layer 2, so that the surface of the battery string layer 2 can all receive the irradiation of light, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.
[0033] Furthermore, the number of the grooves 11 is ɑ, wherein ɑ satisfies: 2≤ɑ≤50. Figure 1When the number of grooves 11 is less than 2, the number of grooves 11 is small. When light is irradiated onto the body 10, most of the light cannot be irradiated into the grooves 11, so that most of the light cannot be refracted. Most of the light still irradiates the battery string layer 2 according to the incident path, which is not conducive to the full utilization of the battery string layer 2 and reduces the photoelectric conversion efficiency of the photovoltaic module 100. When the number of grooves 11 is greater than 50, the number of grooves 11 is large, and most of the light is incident into the grooves 11. After the light passes through the body 10, most of the light can deviate from the original incident path of the light, resulting in uneven distribution of the light on the battery string layer 2. In addition, the excessive number of grooves 11 also increases the time and cost of processing the grooves 11, reducing production efficiency. Therefore, when the number of grooves 11 satisfies 2≤ɑ≤50, the light can be refracted after passing through the body 10, and the edge of the battery string layer 2 can also receive the light. Moreover, the distribution of light in the battery string layer 2 is more uniform, which improves the photoelectric conversion efficiency of the photovoltaic module 100, while saving production costs and improving production efficiency.
[0034] According to some embodiments of the present invention, the width of each groove 11 in the third direction is W1, wherein W1 satisfies: 0.1 mm ≤ W1 ≤ 5.0 mm. Figure 1 and Figure 2 As shown, when the width of the groove 11 in the third direction is less than 0.1mm, the width of the groove 11 is narrow, and the number of light rays that can be irradiated to the groove 11 is limited, so that less light rays can be refracted, so that part of the battery string layer 2 cannot be irradiated by light, reducing the photoelectric conversion efficiency of the battery string layer 2. When the width of the groove 11 in the third direction is greater than 5.0mm, the width of the groove 11 is wider, which will reduce the structural strength of the main body 10, thereby reducing the service life of the photovoltaic module 100. Therefore, the width of the groove 11 in the third direction satisfies 0.1mm≤W1≤5.0mm, which can not only ensure the number of light rays entering the groove 11, but also ensure the refractive index of the groove 11 to the light rays, ensure that the edge of the battery string layer 2 can be irradiated by light, and at the same time enhance the structural strength of the main body 10 and increase the service life of the photovoltaic module 100.
[0035] According to some embodiments of the present invention, the thickness of the body 10 in the first direction is D2, the width of the body 10 in the third direction is W2, and the length of the body 10 in the second direction is L2, wherein D2, W2 and L2 respectively satisfy: 0.6mm≤D2≤10mm, 300mm≤W2≤5000mm, 300mm≤L2≤5000mm. Figure 1 and Figure 2When the thickness of the body 10 in the first direction is less than 0.6 mm, and / or the width is less than 300 mm, and / or the length is less than 300 mm, the thickness, width and length of the body 10 are too small, so that the size and number of the grooves 11 formed on the body 10 are limited, which is not conducive to the refraction of light when passing through the body 10. When the thickness of the body 10 in the first direction is greater than 10 mm, and / or the width is greater than 5000 mm, and / or the length is greater than 5000 mm, the thickness, width and length of the body 10 are too large, so that the number of grooves 11 also needs to be increased, which will increase the production cost of the body 10. Therefore, when the thickness of the body 10 in the first direction satisfies 0.6 mm ≤ D2 ≤ 10 mm, and / or the width satisfies 300 mm ≤ W2 ≤ 5000 mm, and / or the length satisfies 300 mm ≤ L2 ≤ 5000 mm, the number and size of the grooves 11 on the body 10 can be met, so that the light can be injected into the grooves 11 and refracted, and the production cost of the body 10 can also be reduced.
[0036] According to some embodiments of the present invention, the refractive index of the body 10 is γ, wherein γ satisfies: 1%≤γ≤4%. Figure 3 As shown, when the refractive index of the body 10 is less than 1%, the refractive index of the body 10 is too small. When light passes through the body 10, less light will be refracted by the body 10, and most of the light will directly pass through the body 10, so that the light irradiated on the battery string layer 2 is more concentrated, and the edge of the battery string layer 2 is irradiated with less light, which reduces the photoelectric conversion efficiency of the battery string layer 2. When the refractive index of the body 10 is greater than 4%, the refractive index of the body 10 is large, and most of the light will be refracted on the body 10, so that most of the light emitted from the body 10 deviates from the original incident path and is incident on the edge of the battery string layer 2 at a certain angle, thereby causing the surface of the battery string layer 2 to receive uneven light, which is also not conducive to the photoelectric conversion efficiency of the battery string layer 2. Therefore, when the refractive index of the body 10 meets the requirement between 1% and 4%, each position of the battery string layer 2 can be irradiated by light, which improves the photoelectric conversion efficiency of the battery string layer 2 and enhances the photoelectric conversion efficiency of the photovoltaic module 100.
[0037] The photovoltaic module 100 according to the embodiment of the second aspect of the utility model comprises a battery string layer 2, a cover plate 1 and a back plate 3. Specifically, the cover plate 1 is arranged on one side of the battery string layer 2 in the thickness direction, and at least part of the groove 11 of the cover plate 1 is located on the surface of the side of the cover plate 1 away from the battery string layer 2. The cover plate 1 is the cover plate 1 for the photovoltaic module 100 according to the embodiment of the first aspect of the utility model. The back plate 3 is arranged on the other side of the battery string layer 2 in the thickness direction.
[0038] For example, in Figure 4In the example, a groove 11 is provided on the side of the cover plate 1 away from the battery string layer 2. In the first direction of the cover plate 1, the battery string layer 2, the cover plate 1 and the back plate 3 are stacked and arranged in sequence. The battery string layer 2 is arranged between the cover plate 1 and the back plate 3, and the back plate 3 is arranged on the side of the battery string layer 2 away from the cover plate 1, so that the cover plate 1 and the back plate 3 protect the battery string layer 2 and prevent the battery string layer 2 from being damaged.
[0039] In some optional embodiments, a groove 11 may also be provided on one side of the cover plate 1 adjacent to the battery string layer 2 .
[0040] According to the photovoltaic assembly 100 of the embodiment of the utility model, by adopting the above-mentioned cover plate 1, light can be fully utilized, thereby improving the photoelectric conversion efficiency of the photovoltaic assembly 100.
[0041] The photovoltaic power generation system according to the embodiment of the third aspect of the utility model includes the photovoltaic assembly 100 according to the embodiment of the second aspect of the utility model.
[0042] According to the photovoltaic power generation system (not shown) of the embodiment of the utility model, the power generation efficiency of the photovoltaic power generation system is improved by adopting the photovoltaic assembly 100.
[0043] Other structures and operations of the photovoltaic power generation system according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.
[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.
[0046] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A cover plate for a photovoltaic module, characterized in that: include: A body, wherein at least one groove is formed on at least one side surface of the body in a first direction, the groove extends along a second direction, and the first direction is perpendicular to the second direction; Wherein, in the first direction, the cross-sectional area of the groove gradually increases in a direction away from the body.
2. The cover plate for photovoltaic modules according to claim 1, characterized in that: A side surface of a portion of the body in the first direction is concave toward the center of the body to form the groove, and the shape of the groove is arc.
3. The cover plate for photovoltaic modules according to claim 2, characterized in that: The depth of the groove in the first direction is D1, and D1 satisfies: 0.1 mm≤D1≤2.0 mm.
4. The cover plate for a photovoltaic module according to any one of claims 1 to 3, characterized in that: There are a plurality of grooves, and the plurality of grooves are evenly spaced apart along the third direction.
5. The cover plate for photovoltaic modules according to claim 4, characterized in that: The number of the grooves is ɑ, wherein ɑ satisfies: 2≤ɑ≤50.
6. The cover plate for photovoltaic modules according to claim 4, characterized in that: The width of each of the grooves in the third direction is W1, wherein W1 satisfies: 0.1 mm≤W1≤5.0 mm.
7. The cover plate for a photovoltaic module according to claim 4, characterized in that: The thickness of the body in the first direction is D2, the width of the body in the third direction is W2, and the length of the body in the second direction is L2, wherein D2, W2 and L2 respectively satisfy: 0.6mm≤D2≤10mm, 300mm≤W2≤5000mm, 300mm≤L2≤5000mm.
8. The cover plate for a photovoltaic module according to claim 1, characterized in that: The refractive index of the main body is γ, wherein the γ satisfies: 1%≤γ≤4%.
9. A photovoltaic module, characterized in that: include: Battery string layer; A cover plate, the cover plate being arranged on one side of the battery string layer in the thickness direction, and at least part of the groove of the cover plate being located on a surface of the cover plate away from the battery string layer, the cover plate being a cover plate for a photovoltaic module according to any one of claims 1 to 8; A back plate is arranged on the other side of the battery string layer in the thickness direction.
10. A photovoltaic power generation system, characterized in that: Comprising the photovoltaic module according to claim 9.