A photovoltaic module

Abstract

The application discloses a photovoltaic module. The photovoltaic module can comprise a glass cover plate, a plurality of diffraction structures arranged on the glass cover plate, an encapsulation layer, a cell array and a back plate. The cell array comprises a plurality of cell strings arranged in an array. The encapsulation layer is used to encapsulate the cell array between the glass cover plate and the back plate. Each diffraction structure is arranged corresponding to a gap between two adjacent cell strings or corresponding to a gap between a cell string at an edge and an edge of the photovoltaic module adjacent to the cell string. Each diffraction structure comprises a blocking layer and a light-transmitting slit arranged on the blocking layer. The extension direction of the light-transmitting slit is consistent with the extension direction of the cell string, so that light is diffracted when passing through the light-transmitting slit. The photovoltaic module provided by the scheme can effectively improve light utilization.

Description

Technical Field

[0001] This invention relates to a photovoltaic module. Background Technology

[0002] Because of the gaps between cell strings and between the cell strings and the frame in a photovoltaic module, light passing through these gaps is not absorbed by the cells, resulting in some light loss. If the light passing through these gaps could be absorbed and converted by the cells, the photoelectric performance of the photovoltaic module would be effectively improved.

[0003] Currently, the main method for reflecting light involves placing reflective structures, such as ceramic strips, on the backsheet of photovoltaic modules, corresponding to the gaps between cell strings. These reflective structures reflect light to the cover plate of the photovoltaic module, and then to the cell sheets. However, this method suffers from several drawbacks. First, light travels a relatively long distance from the cover plate to the reflective structure on the backsheet. The reflected light then travels another long distance to reach the cover plate, and finally, it travels a considerable distance to reach the cell sheets. This process results in light loss. Second, light undergoes multiple reflections before reaching the cell sheets, with each reflection incurring some degree of light loss. Therefore, the existing method of placing reflective structures between cell strings still suffers from low light utilization efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a photovoltaic module that can effectively improve light utilization.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention provides a photovoltaic module, comprising: a glass cover plate, a plurality of diffraction structures disposed on the glass cover plate, an encapsulation layer, a cell array, and a backsheet, wherein...

[0007] The battery array includes multiple battery strings arranged in a row;

[0008] The encapsulation layer is used to encapsulate the battery array between the glass cover and the backplate;

[0009] Each of the diffraction structures corresponds to the gap between two adjacent battery strings or to the gap between the edge of a battery string and the edge of its adjacent photovoltaic module;

[0010] Each of the diffraction structures includes a blocking layer and a light-transmitting slit disposed in the blocking layer, wherein the extending direction of the light-transmitting slit is consistent with the extending direction of the battery string, so that light passes through the light-transmitting slit and diffracts.

[0011] The technical solution of the above invention has the following advantages or beneficial effects:

[0012] The photovoltaic module provided in this embodiment of the invention has multiple diffraction structures set in the glass cover plate. Each diffraction structure corresponds to the gap between two adjacent cell strings or the gap between the edge of the cell string and the edge of the photovoltaic module. When light passes through the light-transmitting slits included in the diffraction structure, diffraction occurs, and the diffracted light part irradiates the cell, thereby increasing the irradiance or light flux reaching the cell and effectively improving the light utilization rate of the photovoltaic module. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the reflection path of the first type of reflection structure for photovoltaic modules based on existing technology;

[0014] Figure 2 This is a schematic diagram of the reflection path of the second type of reflection structure for photovoltaic modules based on existing technology;

[0015] Figure 3 This is a schematic cross-sectional view of a photovoltaic module according to an embodiment of the present invention.

[0016] Figure 4 This is a schematic cross-sectional view of a second structure of a photovoltaic module according to an embodiment of the present invention;

[0017] Figure 5 This is a schematic cross-sectional view of a third structure of a photovoltaic module according to an embodiment of the present invention;

[0018] Figure 6 This is a schematic cross-sectional view of the fourth structure of a photovoltaic module according to an embodiment of the present invention;

[0019] Figure 7 This is a perspective view of a first top-view structure of a photovoltaic module according to an embodiment of the present invention;

[0020] Figure 8 This is a perspective view of a second top-view structure of a photovoltaic module according to an embodiment of the present invention;

[0021] Figure 9 This is a schematic diagram of a light spot formed by light passing through the light-transmitting slit of a photovoltaic module according to an embodiment of the present invention;

[0022] Figure 10 This corresponds to the embodiments of the present invention. Figure 3 A schematic diagram of the diffracted rays formed by the structure shown;

[0023] Figure 11 This corresponds to the embodiments of the present invention. Figure 4 A schematic diagram of the diffracted rays formed by the structure shown;

[0024] Figure 12 This is a top-view perspective view of the glass plate structure according to an embodiment of the present invention;

[0025] Figure 13 This is a cross-sectional structural diagram of a first structure of a glass plate according to an embodiment of the present invention;

[0026] Figure 14 This is a cross-sectional structural diagram of a first structure of a glass plate according to an embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 10-Glass cover; 11-Groove; 20-Diffraction structure; 21-Blocking layer; 22-Light-transmitting slit; 30-Encapsulation layer; 40-Battery array; 41-Battery string; 50-Backsheet; 60-Reflective structure; 70-Glass plate;

[0029] 71-Glass body. Detailed Implementation

[0030] In the embodiments of this invention, the upper surface of a structure generally refers to the main surface of the structure facing upwards (i.e., towards sunlight) when the photovoltaic module is in use. Correspondingly, the lower surface of a structure in the embodiments of this invention generally refers to the main surface of the structure facing downwards (i.e., away from sunlight) when the photovoltaic module is in use. The upper and lower surfaces of a structure are two main surfaces facing opposite directions.

[0031] Due to current limitations in photovoltaic module layout and manufacturing processes, gaps typically exist between cell strings and between cell strings and the frame. This causes light that would otherwise be incident on the areas between the cell strings and between the cell strings and the frame to pass directly through the photovoltaic module and be lost, preventing it from being fully utilized.

[0032] Currently, reflective structures such as ceramic strips are used on the back panel to reflect light, which is then reflected again by the glass cover before reaching the cells in the battery string and being utilized by them. Specifically, the path of the light reflected by the reflective structure is as follows: Figure 1 and Figure 2 As shown. For example, Figure 1 An exemplary embodiment shows a reflective structure disposed on the upper surface of the back panel 50; from Figure 1 It can be seen that, for light passing between the battery strings, after passing through the glass cover 10 and the encapsulation layer 30, it reaches the reflective structure 60 (i.e., Figure 1 The incident light path a) is illustrated in the example diagram. After being reflected by the reflective structure 60, the reflected light passes through the encapsulation layer 30 again to reach the lower surface of the glass cover 10 (i.e., Figure 1The exemplary light reflection path (b) is shown in the diagram, where the lower surface of the glass cover 10 reflects the light onto the solar cell (i.e., Figure 1 The exemplary light reflection path (c) is shown in the diagram. For example, for a double-glass module (i.e., the backsheet 50 is also glass), Figure 2 An example is provided showing a reflective structure disposed on the lower surface of the back panel 50; from Figure 2 It can be seen that, for light passing between the battery strings, after passing through the glass cover 10, the encapsulation layer 30, and the backplate 50, it reaches the reflective structure 60 (i.e., Figure 2 The incident light path (d) is illustrated in the example diagram. After reflection by the reflective structure 60, the reflected light passes through the back plate 60 and the encapsulation layer 30 again to reach the lower surface of the glass cover 10 (i.e., Figure 2 The exemplary light reflection path (e) is shown in the diagram, where the lower surface of the glass cover 10 reflects the light onto the solar cell (i.e., Figure 2 The exemplary landmark shows the light reflection path f). From Figure 1 and Figure 2 It is evident that light needs to travel a relatively long path to reach the solar cell. During this process, the light must pass through structures such as the glass cover and encapsulation layer, resulting in some light loss. Therefore, the existing practice of incorporating reflective structures on the backsheet of photovoltaic modules still has room for improvement in enhancing the light utilization efficiency of these modules.

[0033] To address the issue of insufficient light utilization in existing photovoltaic modules, this invention improves the structure of conventional photovoltaic modules, providing a novel photovoltaic module structure.

[0034] in, Figures 3 to 6 The diagram shows cross-sectional structural schematics of various photovoltaic modules provided in embodiments of the present invention; Figure 7 and Figure 8 This is a top-view perspective view of the photovoltaic module provided in an embodiment of the present invention.

[0035] like Figures 3 to 8 As shown, this embodiment of the invention provides a photovoltaic module. The photovoltaic module may include: a glass cover plate 10, a plurality of diffraction structures 20 disposed on the glass cover plate 10, an encapsulation layer 30, a cell array 40, and a backsheet 50, wherein...

[0036] The battery array 40 includes a plurality of battery strings 41 arranged in an array;

[0037] Encapsulation layer 30 is used to encapsulate battery array 40 between glass cover plate 10 and back plate 50;

[0038] Each diffraction structure 20 corresponds to the gap between two adjacent battery strings 41 or to the gap between the edge of a battery string 41 and the edge of its adjacent photovoltaic module.

[0039] Each diffraction structure 20 includes a blocking layer 21 and a light-transmitting slit 22 disposed on the blocking layer 21, wherein the extending direction of the light-transmitting slit 22 is consistent with the extending direction of the battery string, so that light passes through the light-transmitting slit 22 and diffracts.

[0040] In a preferred embodiment, diffraction structures can be provided corresponding to the gaps between every two adjacent cell strings and the gaps between each edge cell string and the edge of its adjacent photovoltaic module. Alternatively, those skilled in the art can selectively provide diffraction structures as needed.

[0041] The light-transmitting slit 22 extends along the direction of the battery string. For example, if the photovoltaic module has two rows of battery strings arranged side by side and connected by a middle busbar, the length of the light-transmitting slit 22 can be substantially the same as the length of one battery string; or the length of the light-transmitting slit 22 can be substantially the same as the length of two battery strings. In a preferred embodiment, the length of the light-transmitting slit 22 is substantially the same as the length of two battery strings to facilitate the setting of the diffraction structure 20 and simplify the setting process of the diffraction structure 20.

[0042] In this embodiment of the invention, the blocking layer 21 can block light from passing through its location.

[0043] In this context, the edges of the photovoltaic modules adjacent to the edge of the battery string are generally parallel to the direction of the battery string's extension.

[0044] Among them, light diffracts as it passes through the light-transmitting slit 22, as shown in the example. Figures 9 to 11 As shown. Among them, Figure 10 For corresponding Figure 3 The diffraction pattern of the structure shown; Figure 11 For corresponding Figure 4 The diffraction pattern of the structure shown. Figure 9 As shown, light passing through the light-transmitting slit 22 forms a diffraction spot A, which covers a portion of the battery string, meaning the light diffracts onto the battery cells of the battery string 41. Additionally, from... Figure 10 and Figure 11 It can be seen that the diffracted light rays expand after diffraction, allowing them to reach the solar cell. The solar cell can then utilize this portion of the light, thereby improving the light utilization efficiency of the photovoltaic module.

[0045] The projection of the edge of the blocking layer 21 included in the diffraction structure 20 is adjacent to or coincides with the edge of the adjacent battery string, so as to avoid gaps between the edge of the blocking layer 21 and the edge of the battery string, and at the same time avoid the blocking layer 21 from blocking the battery string.

[0046] The photovoltaic module provided in this embodiment of the invention has multiple diffraction structures set in the glass cover. Each diffraction structure corresponds to the gap between two adjacent cell strings or the gap between the edge of a cell string and the edge of the photovoltaic module. When light passes through the light-transmitting slits included in the diffraction structure, diffraction occurs, and the diffracted light part irradiates the cell, thereby increasing the irradiance or luminous flux of the light reaching the cell, so as to effectively improve the light utilization rate of the photovoltaic module.

[0047] Furthermore, the plurality of diffraction structures 20 may be disposed in any of the following locations:

[0048] like Figure 3 and Figure 6 The upper surface of the glass cover 10 shown, such as Figure 4 The lower surface of the glass cover 10 shown and as Figure 5 Inside the glass cover plate 10 shown.

[0049] Compared to Figure 1 and Figure 2 The reflection path of the reflection structure shown in this embodiment of the invention is the diffraction path of the photovoltaic module. The diffraction spot formed by the diffraction slit directly reaches the cell through part of the encapsulation layer. Compared with reflection, this diffraction greatly shortens the light path and helps to improve light utilization.

[0050] In a preferred embodiment, such as Figure 3 and Figure 6 Multiple diffraction structures 20 are provided on the upper surface of the glass cover plate 10. By providing multiple diffraction structures 20 on the upper surface of the glass cover plate 10, the diffracted light passing through the light-transmitting slit 22 can be refracted through the glass cover plate 10, forming a larger diffraction spot on the cell string. That is, after refraction, more diffracted light can reach the cell, thereby improving the light utilization rate of the photovoltaic module.

[0051] The light-transmitting slit 22 is parallel to the extension direction of the battery string, so that the diffracted light received by each battery cell on the battery string is basically the same, making the maximum use of the diffracted light formed through the light-transmitting slit.

[0052] Furthermore, in the diffraction structure 20 provided in this embodiment of the invention, the width of the light-transmitting slit 22 generally does not exceed 0.8 mm, to ensure that the gap between the light-transmitting slit 22 and the battery string 41, or the gap between the edge of the battery string 41 and the edge of the photovoltaic module, matches to form a relatively strong diffraction spot, and that most of the diffraction spot reaches the battery cell. Meanwhile, the width of the light-transmitting slit 22 is generally not less than 0.1 mm to meet process requirements. In addition, research has found that if the width of the light-transmitting slit 22 is less than 0.1 mm, there will be relatively high light loss when it matches the glass cover plate 10. Therefore, by controlling the width of the light-transmitting slit 22 to generally not less than 0.1 mm, this embodiment of the invention not only meets the process production accuracy requirements but also effectively reduces the light loss of the photovoltaic module.

[0053] For example, the width of the light-transmitting slit 22 can be 0.8mm, 0.7mm, 0.6mm, 0.5mm, 0.4mm, 0.3mm, 0.2mm, 0.1mm, etc. In a preferred embodiment, the width of the light-transmitting slit 22 can be 0.1 to 0.2mm, for example, 0.1mm, 0.12mm, 0.13mm, 0.15mm, 0.16mm, 0.18mm, 0.19mm, 0.2mm, etc. The width of the light-transmitting slit generally refers to its dimension perpendicular to the battery string direction; correspondingly, the length of the light-transmitting slit generally refers to its dimension parallel to the battery string direction.

[0054] The gap between two adjacent battery strings is typically 1 to 2 mm.

[0055] Furthermore, each diffraction structure 20 provided in this embodiment of the invention may include at least one light-transmitting slit 22. For example, as Figures 3 to 7 As shown, a diffraction structure 20 may include a light-transmitting slit 22. For example, as... Figure 8 As shown, a diffraction structure 20 may include at least two light-transmitting slits 22.

[0056] Specifically, for the case where each diffraction structure 20 includes at least two light-transmitting slits 22,

[0057] The distance between two adjacent light-transmitting slits 22 shall not be less than 5 times the width of the light-transmitting slit 22, preferably not less than 10 times the width of the light-transmitting slit 22. For example, if the width of the light-transmitting slit 22 is 0.1 mm, then the distance between two adjacent light-transmitting slits 22 shall not be less than 0.5 mm, preferably not less than 1 mm; or if the width of the light-transmitting slit 22 is 0.2 mm, then the distance between two adjacent light-transmitting slits 22 shall not be less than 1 mm, preferably not less than 2 mm; or if the width of the light-transmitting slit 22 is 0.5 mm, then the distance between two adjacent light-transmitting slits 22 shall not be less than 2.5 mm, preferably not less than 5 mm, etc. In the case where each diffraction structure 20 includes at least two light-transmitting slits 22, by controlling the distance between two adjacent light-transmitting slits 22 to be no less than 5 times the width of the light-transmitting slits 22, interference between diffracted light rays passing through the two adjacent light-transmitting slits 22 can be effectively reduced, thereby avoiding the generation of bright and dark areas of light on the solar cell, so as to ensure the irradiance or luminous flux reaching the solar cell.

[0058] The distance between two adjacent light-transmitting slits 22 generally refers to the distance between the midlines of two adjacent light-transmitting slits 22 or the distance between two adjacent edges of two light-transmitting slits 22.

[0059] Specifically, in the case where the diffraction structure 20 provided for the gap between two adjacent battery strings 41 includes only one light-transmitting slit 22, the light-transmitting slit 22 of the diffraction structure 20 is located in the middle of the gap between the two adjacent battery strings 41. This positioning of the light-transmitting slit 22 ensures that the light reaching the battery cells on both sides is essentially uniform. Furthermore, tests have shown that this positioning of the light-transmitting slit 22 allows the battery strings to achieve an absorption rate of 30% to 40% for the light passing through the gap between the two adjacent battery strings 41.

[0060] Furthermore, a diffraction structure 20 with a light-transmitting slit 22 is generally provided for the gap between the edge of the cell string 41 in the photovoltaic module and the edge of the adjacent photovoltaic module, and the distance between the light-transmitting slit and the edge of the cell string is as close as possible.

[0061] Understandably, the position of the diffraction structure 20, the position of the light-transmitting slit 22 included in the diffraction structure 20, the width of the diffraction structure 20, and the width of the light-transmitting slit 22 are all related to the gap between the cell strings. Based on the solution provided in this embodiment of the invention, users can adaptively adjust the position of the diffraction structure 20, the position of the light-transmitting slit 22 included in the diffraction structure 20, the width of the diffraction structure 20, and the width of the light-transmitting slit 22 according to the gap between the cell strings in actual photovoltaic modules. It is worth noting that the width of the diffraction structure 20 is generally basically consistent with the width of the gap between the cell strings (i.e., the string spacing), and the width of the diffraction structure 20 can be slightly smaller than the width of the gap between the cell strings to ensure that the diffraction structure 20 does not obscure the cell strings.

[0062] The diffraction structure 20 is formed by attaching strips or printing.

[0063] Furthermore, the aforementioned blocking layer 21 includes blocking areas located on both sides of the light-transmitting slit 22 that are integrally formed or separate structures. For example, the blocking areas located on both sides of the light-transmitting slit 22 can be printed or pasted separately. The blocking areas located on both sides of the light-transmitting slit 22 and the light-transmitting slit 22 can also be an integral structure. This integral structure can be printed onto the glass cover plate using a specific printing tool, or the pre-made diffraction structure 20 can be directly attached to the glass cover plate 10.

[0064] That is, the blocking areas on both sides of the light-transmitting slit 22 can be two separate blocking strips. By attaching these blocking strips to the glass cover plate 10, the light-transmitting slit 22 is formed between the blocking strips. Alternatively, the blocking areas on both sides of the light-transmitting slit 22 can also be formed by printing.

[0065] The thermal expansion coefficient of the material forming the diffraction structure 20 is the same as that of the glass cover plate 10. Furthermore, the material forming the diffraction structure is generally opaque and has low reflectivity; that is, the material forming the barrier layer 21 in the diffraction structure 20 is opaque and has low reflectivity. Examples include materials such as SiC and TiO2 with added colorants.

[0066] Furthermore, the width of the light-transmitting slit 22 in the diffraction structure 20 provided in this embodiment of the invention is positively correlated with the thickness of the glass cover plate 10. That is, the thicker the glass cover plate 10, the wider the light-transmitting slit 22; the thinner the glass cover plate 10, the smaller the width of the light-transmitting slit 22, so as to effectively improve the light diffraction effect formed through the light-transmitting slit 22 and the irradiance or light flux reaching the solar cell.

[0067] Furthermore, in the diffraction structure 20 provided in this embodiment of the invention, the difference between the length and width of the light-transmitting slit 22 exceeds three orders of magnitude (these three orders of magnitude are 10). 3 By limiting the difference between the length and width of the light-transmitting slit 22, the diffracted light spot formed through the light-transmitting slit 22 can have a relatively large extension towards the battery string, thereby allowing as much diffracted light as possible to reach the battery string, thus further improving the light utilization rate of the photovoltaic module.

[0068] Furthermore, such as Figure 6 As shown, the glass cover plate 10 includes a groove 11 corresponding to the diffraction structure 20, wherein the diffraction structure 20 is filled in the groove 11.

[0069] In the above embodiments, the diffraction structure 20 disposed on the glass cover plate 10 can be prepared in the photovoltaic module manufacturing process or in the glass manufacturing process.

[0070] In the photovoltaic module manufacturing process, the preparation of the diffraction structure 20 for the glass cover plate 10 can be achieved by adding an adhesion or printing device for the diffraction structure 20 at the very beginning of the photovoltaic module manufacturing process. This adhesion or printing device can be any commonly used adhesion or printing device in existing photovoltaic modules. The entire process requires no adjustment to subsequent photovoltaic module manufacturing processes; therefore, this photovoltaic module manufacturing method does not require adjustments to existing photovoltaic module processes and equipment, effectively controlling photovoltaic module production costs.

[0071] Furthermore, such as Figures 12 to 14 As shown, this embodiment of the invention provides a glass plate 70 for use with photovoltaic modules. This glass plate can be cut to obtain the glass cover plate 10 required for the photovoltaic module of this invention.

[0072] like Figures 12 to 14 As shown, the glass plate 70 provided in this embodiment of the invention includes a glass body 71 and a plurality of diffraction structures 20 disposed on the glass body 71, wherein the diffraction structure 20 includes a blocking layer 21 and a light-transmitting slit 22 disposed on the blocking layer 21.

[0073] In the glass cover plate 10 cut from the glass plate 70, each of the plurality of diffraction structures 20 included in the glass cover plate 10 may correspond to the gap between two adjacent battery strings 41 or to the gap between the edge of the battery string 41 and the edge of the adjacent photovoltaic module; the extension direction of the light-transmitting slit 22 included in each diffraction structure 20 is consistent with the extension direction of the battery string, so that light is diffracted through the light-transmitting slit 22.

[0074] Therefore, the glass plate 70 provided in this embodiment of the invention includes a plurality of diffraction structures 20 arranged in parallel. The spacing between adjacent edges of any two adjacent diffraction structures 20 is equal to the width of the cell string in the photovoltaic module.

[0075] The diffraction structure 20 can be disposed on the main surface of the glass plate 70 or inside the glass plate 70.

[0076] When the diffraction structure 20 is disposed on the main surface of the glass plate 70, the main surface of the glass plate 70 with the diffraction structure 20 can be used as the upper surface of the glass cover plate 10 of the photovoltaic module or as the lower surface of the glass cover plate 10.

[0077] Additionally, a diffraction structure 20 may include one or more light-transmitting slits 22. Diffraction structures including one light-transmitting slit 22 and diffraction structures including multiple light-transmitting slits 22 may be combined on the same glass plate 70.

[0078] The width of the light-transmitting slit 22 in the diffraction structure 20 of the glass plate 70 is generally no more than 0.8 mm, and the width of the light-transmitting slit 22 is generally no less than 0.1 mm.

[0079] In the case where the diffraction structure 20 of the glass plate 70 includes multiple light-transmitting slits 22, the distance between two adjacent light-transmitting slits 22 in the diffraction structure 20 is not less than 5 times the width of the light-transmitting slit 22. Preferably, the distance between two adjacent light-transmitting slits 22 is not less than 10 times the width of the light-transmitting slit 22.

[0080] The glass plate 70 includes a diffraction structure 20 in which the blocking layer 21 includes blocking areas located on both sides of the light-transmitting slit 22 that are integrally formed or separate structures.

[0081] The width of the light-transmitting slit 22 in the diffraction structure 20 of the glass plate 70 is positively correlated with the thickness of the glass cover plate 10.

[0082] In addition, the difference between the length and the width of the light-transmitting slit 22 in the diffraction structure 20 included in the glass plate 70 exceeds three orders of magnitude.

[0083] In addition, such as Figure 14 As shown, the glass plate 70 includes a groove 11 corresponding to the diffraction structure 20, wherein the diffraction structure 20 fills the groove 11.

[0084] The diffraction structure 20 included in the glass plate 70 is formed by a strip application method or a printing method.

[0085] The coefficient of thermal expansion of the material forming the diffraction structure 20 of the glass plate 70 is the same as that of the glass cover plate 10.

[0086] The material forming the diffraction structure 20 is an opaque material with low reflectivity.

[0087] This invention relates to a glass plate used in photovoltaic modules. By setting multiple diffraction structures, each diffraction structure corresponds to the gap between two adjacent cell strings or the gap between an edge cell string and the edge of the adjacent photovoltaic module. When light passes through the light-transmitting slits included in the diffraction structure, diffraction occurs, causing part of the diffracted light to irradiate the cell, thereby increasing the irradiance or luminous flux reaching the cell and effectively improving the light utilization rate of the photovoltaic module.

[0088] The above steps are provided only to help understand the method, structure, and core ideas of this invention. Those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A photovoltaic module, characterized in that, include: The glass cover (10), a plurality of diffraction structures (20) disposed on the glass cover (10), an encapsulation layer (30), a battery array (40), and a backplate (50), wherein, The battery array (40) includes a plurality of battery strings (41) arranged in a row; The encapsulation layer (30) is used to encapsulate the battery array (40) between the glass cover (10) and the back plate (50); Each of the diffraction structures (20) corresponds to the gap between two adjacent battery strings (41) or to the gap between the edge of the battery string (41) and the edge of the photovoltaic module to which it is located; Each of the diffraction structures (20) includes a blocking layer (21) and a light-transmitting slit (22) disposed on the blocking layer (21), wherein the extending direction of the light-transmitting slit (22) is consistent with the extending direction of the battery string, so that the diffracted light spot formed by the light passing through the light-transmitting slit (22) covers a part of the battery string (41).

2. The photovoltaic module according to claim 1, characterized in that, The plurality of said diffraction structures (20) are disposed in any of the following locations: The upper surface of the glass cover (10), the lower surface of the glass cover (10) and the interior of the glass cover (10); And / or, The light-transmitting slit (22) is parallel to the extension direction of the battery string.

3. The photovoltaic module according to claim 1, characterized in that, The width of the light-transmitting slit (22) is not more than 0.8 mm and the width of the light-transmitting slit (22) is not less than 0.1 mm.

4. The photovoltaic module according to claim 1, characterized in that, Each of the diffraction structures (20) includes at least one of the light-transmitting slits (22).

5. The photovoltaic module according to claim 4, characterized in that, Each of the diffraction structures (20) includes one of the light-transmitting slits (22); or, For each of the diffraction structures (20) including at least two of the light-transmitting slits (22), The distance between two adjacent light-transmitting slits (22) is not less than 5 times the width of the light-transmitting slit (22).

6. The photovoltaic module according to claim 1, characterized in that, The light-transmitting slit (22) included in the diffraction structure (20) provided for the gap between two adjacent battery strings (41) is located at the middle position of the gap between two adjacent battery strings (41); The diffraction structure (20) provided for the gap between the battery string (41) corresponding to the edge and the edge of the adjacent photovoltaic module includes the light-transmitting slit (22) close to the battery string (41).

7. The photovoltaic module according to claim 1, characterized in that, The blocking layer (21) includes blocking areas located on both sides of the light-transmitting slit (22) that are integrally formed or separate structures.

8. The photovoltaic module according to claim 1, characterized in that, The width of the light-transmitting slit (22) is positively correlated with the thickness of the glass cover plate (10); And / or, The difference between the length of the light-transmitting slit (22) and the width of the light-transmitting slit (22) exceeds three orders of magnitude.

9. The photovoltaic module according to claim 1, characterized in that, The glass cover plate (10) includes a groove (11) corresponding to the diffraction structure (20), wherein, The diffraction structure (20) fills the groove (11); And / or, The diffraction structure (20) is formed by strip application or printing. And / or, The coefficient of thermal expansion of the material forming the diffraction structure (20) is the same as that of the glass cover plate (10); And / or, The material forming the diffraction structure (20) is an opaque material with low reflectivity.

10. The photovoltaic module according to claim 2, characterized in that, Multiple diffraction structures (20) are disposed on the upper surface of the glass cover plate (10).

11. The photovoltaic module according to claim 5, characterized in that, For each of the diffraction structures (20) including at least two of the light-transmitting slits (22), The distance between two adjacent light-transmitting slits (22) is not less than 10 times the width of the light-transmitting slit (22).

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