A solar cell module and a photovoltaic system

Abstract

The utility model is suitable for solar cell technical field provides a kind of solar cell module and photovoltaic system, solar cell module includes: multiple cell strings, each cell string includes multiple cell pieces sequentially arranged along first direction, and cell string includes oppositely arranged front face and back face;First adhesive film is arranged on the back face of cell string;And back glass is arranged on the side of first adhesive film away from cell string, and back glass includes the outer surface away from first adhesive film, and outer surface is provided with multiple first reflection structure, and first reflection structure is strip-shaped convex or strip-shaped groove, and first reflection structure has at least one reflecting surface, and the included angle of reflecting surface and the horizontal plane of back glass is 30°~46°. The solar cell module provided by the utility model can reduce the escape of sunlight from the back glass, increase the utilization rate of solar cells to sunlight, thereby improve the power of solar cell module, and facilitate the cleaning of back glass dust.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, and in particular to a solar cell module and photovoltaic system. Background Technology

[0002] Solar cells, also known as photovoltaic cells, are devices that directly convert light energy into direct current using the photovoltaic effect. In related technologies, multiple solar cells are connected in series and then laminated and encapsulated to form a solar cell module. The resulting solar cell module typically includes a back glass, a first encapsulating film, a cell string, a second encapsulating film, and a front glass, which are stacked in sequence.

[0003] In related technologies, the outer surface of the back glass of a solar cell module is usually set as a plane. When sunlight shines from the front of the cell string, the outer surface of the back glass is a planar structure. After the sunlight shines from the front of the cell string through the cells or through the gaps between the cells, the sunlight is easy to be emitted directly from the outer surface of the back glass, resulting in low sunlight utilization and low power of the solar cell module. Utility Model Content

[0004] This invention provides a solar cell module that aims to solve the problem that existing solar cell modules have low power output due to sunlight easily escaping directly from the outer surface of the back glass, resulting in low sunlight utilization.

[0005] This invention is implemented by providing a solar cell module, comprising:

[0006] Multiple battery strings, each battery string including multiple battery cells arranged sequentially along a first direction, the battery string including a front side and a back side arranged opposite to each other;

[0007] A first adhesive film disposed on the back side of the battery string; and

[0008] The back glass is disposed on the side of the first adhesive film away from the battery string. The back glass includes an outer surface disposed away from the first adhesive film. The outer surface is provided with a plurality of first reflective structures. The first reflective structure is an elongated protrusion or an elongated groove. The first reflective structure has at least one reflective surface. The angle between the reflective surface and the horizontal plane of the back glass is 30° to 46°.

[0009] Preferably, the length direction of the back glass is arranged along the first direction, and the width direction of the back glass is arranged along the second direction; each of the first reflective structures extends along the first direction, and a plurality of the first reflective structures are arranged in parallel intervals along the second direction.

[0010] Preferably, the length of the first reflective structure is greater than two-thirds of the length of the back glass.

[0011] Preferably, the length direction of the back glass is arranged along the first direction, and the width direction of the back glass is arranged along the second direction; each of the first reflective structures extends along the second direction, and a plurality of the first reflective structures are arranged in parallel intervals along the first direction.

[0012] Preferably, the length of the first reflective structure is greater than two-thirds of the width of the back glass.

[0013] Preferably, the length direction of the back glass is arranged along the first direction, and the width direction of the back glass is arranged along the second direction; the first reflective structure extends along a third direction, and the third direction intersects with both the first direction and the second direction.

[0014] Preferably, the angle between the third direction and the first direction is equal to the angle between the third direction and the second direction.

[0015] Preferably, the elongated protrusion is arranged opposite to the outer surface, and the reflective surface is the side surface of the elongated protrusion.

[0016] Preferably, the elongated groove is recessed on the outer surface, and the reflective surface is the inner surface of the elongated groove.

[0017] Preferably, the angle between the reflective surface and the horizontal plane of the back glass is 35° to 45°.

[0018] Preferably, each of the first reflective structures includes at least two intersecting reflective surfaces, the two reflective surfaces forming an angle equal to the horizontal plane of the back glass.

[0019] Preferably, the ratio of the thickness of the back glass to the height of the elongated protrusion is 10 to 200; and / or, the ratio of the thickness of the back glass to the depth of the elongated groove is 50 to 300.

[0020] Preferably, the width of the elongated groove is 0.1 to 3 mm; and / or, the width of the elongated protrusion is 0.1 to 3 mm.

[0021] Preferably, the back glass includes an inner surface disposed near the first adhesive film, and the inner surface is provided with a plurality of second reflective structures.

[0022] Preferably, the second reflective structure is one or a combination of at least two of the following: a pyramid, a long strip protrusion, or a long strip groove.

[0023] This invention also provides a photovoltaic system, including the aforementioned solar cell module.

[0024] This utility model provides a solar cell module that uses elongated protrusions or grooves on the outer surface of the back glass as a first reflective structure. Each first reflective structure has at least one reflective surface, and the angle between the reflective surface and the horizontal plane of the back glass is 30° to 46°. When sunlight from the front of the cell string enters the back glass through the cells or gaps between the cells, the sunlight is reflected back onto the cells by the reflective surface of the first reflective structure. This increases the utilization rate of sunlight by the cells and prevents sunlight from escaping directly from the back glass, thereby improving the utilization rate of sunlight by the cells and thus enhancing the overall performance. The power of the solar cell module; moreover, by controlling the angle between the reflective surface of the first reflective structure and the horizontal plane of the back glass to be between 30° and 46°, sunlight perpendicular to the back glass can be reflected onto the solar cell as much as possible, which can greatly improve the utilization rate of sunlight by the solar cell; in addition, the first reflective structure is set as a continuous elongated protrusion or elongated groove, which can make sunlight reflect onto the solar cell in a continuous linear manner, which can further improve the utilization rate of sunlight by the solar cell. Moreover, the first reflective structure is set as an elongated protrusion or elongated groove, which makes it easier to clean the dust accumulated on the back glass and facilitates the cleaning and maintenance of the solar cell module. Attached Figure Description

[0025] Figure 1 A plan view of a solar cell module provided in an embodiment of this utility model;

[0026] Figure 2 A cross-sectional schematic diagram of a solar cell module provided in an embodiment of this utility model;

[0027] Figure 3 A perspective view of the back glass of a solar cell module provided in an embodiment of this utility model;

[0028] Figure 4 A plan view of the first type of back glass of a solar cell module provided in an embodiment of the present utility model;

[0029] Figure 5 A side view of the first type of back glass of the solar cell module provided in an embodiment of the present invention;

[0030] Figure 6 for Figure 5 A magnified schematic diagram of part A in the middle;

[0031] Figure 7 A side view of the second type of back glass of the solar cell module provided in an embodiment of the present invention;

[0032] Figure 8 for Figure 7 A magnified schematic diagram of part B in the middle;

[0033] Figure 9 A plan view of a third type of back glass for a solar cell module provided in an embodiment of the present invention;

[0034] Figure 10 A plan view of the fourth type of back glass of the solar cell module provided in this embodiment of the present invention;

[0035] Figure 11 This is a cross-sectional schematic diagram of another solar cell module provided in an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "back", "front", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] Please refer to Figures 1-8 This utility model provides a solar cell module, including:

[0041] Multiple battery strings 1, each battery string 1 includes multiple battery pieces 11 arranged sequentially along the first direction Y, and the battery string 1 includes a front side 101 and a back side 102 arranged opposite to each other;

[0042] The first adhesive film 2 is disposed on the back side 102 of the battery string 1; and

[0043] The back glass 3 is disposed on the side of the first adhesive film 2 away from the battery string 1. The back glass 3 includes an outer surface 31 disposed away from the first adhesive film 2. The outer surface 31 is provided with a plurality of first reflective structures 30. The first reflective structure 30 is an elongated protrusion or an elongated groove. The first reflective structure 30 has at least one reflective surface 301. The angle C between the reflective surface 301 and the horizontal plane of the back glass 3 is 30° to 46°.

[0044] In this embodiment of the utility model, such as Figure 1 As shown, the solar cell module includes several cell strings 1, each cell string 1 including several solar cells 11 connected in series along a first direction Y. The solar cells 11 in each cell string 1 are arranged sequentially along the first direction Y. There may be gaps between adjacent solar cells 11 in each cell string 1, or there may be no gaps between adjacent solar cells 11 in each cell string 1. The specific number of cell strings 1 is not limited. Figure 1 The diagram shows that there are 12 battery strings 1. The battery strings 1 can be arranged at intervals along the second direction X, or at intervals along the first direction Y, and multiple battery strings 1 are arranged to form a battery cell array. The length direction of the back glass 3 is set along the first direction Y, and the width direction of the back glass 3 is set along the second direction X. The first direction Y is perpendicular to the second direction X.

[0045] In this embodiment of the invention, the battery strings 1 can be connected in series and parallel to achieve current collection and output. For example, the connection between the battery cells 11 can be achieved by welding welding strips, and the series and parallel connection between the battery strings 1 can be achieved by busbars. Specifically, two adjacent battery strings 1 along the first direction Y are connected in parallel through a middle busbar 6, and two adjacent battery strings 1 along the second direction X are connected in series through an edge busbar 7. The battery cells 11 can be back-contact solar cells, Topcon solar cells, or other types; no specific limitation is made here.

[0046] In this embodiment of the present invention, the battery string 1 includes a front side 101 and a back side 102 arranged opposite to each other. The front side 101 of the battery string 1 is the light-receiving surface of the battery cell 11, that is, the side of the battery cell 11 facing the sunlight when it is working. The back side 102 of the battery string 1 is the back-lighting surface of the battery cell 11, that is, the side of the battery cell 11 facing away from the sunlight when it is working.

[0047] In this embodiment of the invention, a long strip-shaped protrusion or a long strip-shaped groove is provided on the outer surface 31 of the back glass 3 as a first reflective structure 30. Since each first reflective structure 30 has at least one reflective surface 301, and the angle between the reflective surface 301 and the horizontal plane of the back glass 3 is 30° to 46°, when sunlight irradiated from the front 101 of the battery string 1 passes through the battery cell 11 or through the gap between the battery strings 1 and enters the back glass 3, the sunlight passes through the back glass 3 and enters the reflective surface 301 of the first reflective structure 30, and is then reflected back to the battery cell 11 by the reflective surface 301 of the first reflective structure 30. This increases the utilization rate of sunlight by the battery cell 11, prevents sunlight from escaping directly from the back glass 3, thereby improving the utilization rate of sunlight by the battery cell 11 and thus increasing the power of the solar cell module; moreover, controlling the first The angle C between the reflective surface 301 of the first reflective structure 30 and the horizontal plane of the back glass 3 is between 30° and 46°, which allows sunlight perpendicular to the back glass 3 to be reflected onto the solar cell 11 as much as possible, greatly improving the utilization rate of sunlight by the solar cell 11. In addition, the first reflective structure 30 is set as a continuous elongated protrusion or elongated groove. Compared with multiple pyramidal structures that are spaced apart and independently distributed as the first reflective structure, the first reflective structure of the present invention, which is an elongated protrusion or elongated groove, allows sunlight to be reflected continuously and linearly onto the solar cell 11 along the length of the elongated protrusion or elongated groove, which can further improve the utilization rate of sunlight by the solar cell 11. Moreover, since the first reflective structure 30 is set as an elongated protrusion or elongated groove, it is easier to clean the dust accumulated on the back glass 3, which facilitates the cleaning and maintenance of the solar cell module.

[0048] In this embodiment of the present invention, the outer surface 31 is provided with a plurality of first reflective structures 30. The first reflective structure 30 is a long strip protrusion or a long strip groove. It can be understood that each first reflective structure 30 is a long strip protrusion, or each first reflective structure 30 is a long strip groove, or a portion of the first reflective structures 30 can be long strip protrusions and a portion of the first reflective structures 30 can be long strip grooves, that is, the outer surface 31 is provided with a combination of long strip protrusions and long strip grooves.

[0049] like Figures 3-6 As shown, in one embodiment of this utility model, the first reflective structure 30 is an elongated protrusion. This can be understood as the first reflective structure 30 being an elongated protrusion structure with both length and width, and the length of the elongated protrusion being greater than its width. Figures 7-8 As shown, when the first reflective structure 30 is an elongated groove, the first reflective structure 30 is an elongated groove with a length and a width, and the length of the elongated groove is greater than the width of the elongated groove. The length of the first reflective structure 30 is not limited and can be flexibly set according to the size of the back glass 3.

[0050] As one embodiment of this utility model, the cross-section of the first reflective structure 30 can be triangular, trapezoidal, polygonal, or other irregular shapes. Figure 6 The first reflective structure 30 shown in the diagram is a long strip-shaped protrusion with a triangular cross-section. Figure 8 The first reflective structure 30 shown is an elongated groove with a triangular cross-section.

[0051] Please refer to Figures 3-6 As an embodiment of the present invention, when the first reflective structure 30 is a long strip protrusion, the long strip protrusion is raised relative to the outer surface 31, and the reflective surface 301 is the side surface of the long strip protrusion.

[0052] In this embodiment, when the first reflective structure 30 is a long strip protrusion, on the one hand, the reflective surface 301 of the long strip protrusion can reflect the sunlight passing through the front of the battery string 1, thereby improving the utilization rate of sunlight by the battery cell 11; on the other hand, the long strip protrusion is beneficial to enhance the structural strength of the back glass 3 and improve the structural stability of the back glass 3.

[0053] Among them, such as Figure 6As shown, the solar beam G1 enters the front of the back glass 3 through the solar cell 11 or through the gap between the solar cells 11. After entering the back glass 3, the solar beam G1 is reflected by the reflective surface 301 of the first reflective structure 30 of the back glass 3. The solar beam G1 becomes the solar beam G2 after passing through the reflective surface 301 of the first reflective structure 30 of the back glass 3. The solar beam G2 re-enters the solar cell 11, thereby making full use of sunlight, improving the utilization rate of sunlight, and avoiding the direct emission of sunlight from the back glass 3.

[0054] As one embodiment of this utility model, the width L1 of the elongated protrusion is 0.1 to 3 mm.

[0055] In this embodiment, the width L1 of the elongated protrusion is controlled to be between 0.1 and 3 mm. This ensures both good solar reflectivity and structural strength of the elongated protrusion, while also facilitating its processing and shaping. Of course, in other embodiments, the width L1 of the elongated protrusion can be set to other values.

[0056] As one embodiment of this utility model, the ratio of the thickness H0 of the back glass 3 to the height H1 of the elongated protrusion is 10 to 200.

[0057] In this embodiment, the ratio of the thickness H0 of the back glass 3 to the height H1 of the elongated protrusion is controlled to be 10 to 200. This ensures that the elongated protrusion has good solar reflectivity and that the back glass 3 has good structural strength. This achieves an optimized design of the height of the elongated protrusion and the thickness of the back glass 3, taking into account both the solar reflectivity of the first reflective structure 30 and the structural strength of the back glass 3.

[0058] Please refer to this again. Figure 7 and Figure 8 In another embodiment of this utility model, when the first reflective structure 30 is an elongated groove, the elongated groove is recessed on the outer surface 31, and the reflective surface 301 is the inner surface of the elongated groove.

[0059] Among them, such as Figure 8 As shown, sunlight shining from the front of the battery string 1 passes through the battery cells 11 or the gaps between the battery cells 11 and enters the front of the back glass 3. The sunlight beam G3 enters the back glass 3 from the front and is reflected by the reflective surface 301 of the first reflective structure 30 of the back glass 3. The sunlight beam G3 is reflected by the reflective surface 301 of the first reflective structure 30 of the back glass 3 and becomes the sunlight beam G4. The sunlight beam G4 re-enters the battery cells 11, thereby making full use of sunlight, improving the utilization rate of sunlight, and preventing sunlight from being directly emitted from the back glass 3.

[0060] In this embodiment, when the first reflective structure 30 is a long strip groove, on the one hand, the reflective surface 301 of the long strip groove can reflect the sunlight transmitted through the front of the battery string 1, thereby improving the utilization rate of sunlight by the battery cell 11; on the other hand, since the long strip groove is recessed relative to the outer surface 31 of the back glass 3, the reflective surface 301 of the long strip groove is not easily worn, which can ensure the reliability of the reflective surface 301 in reflecting sunlight.

[0061] In one embodiment of this utility model, the width L1 of the elongated groove is 0.1–3 mm. In this embodiment, controlling the width L2 of the elongated groove to be 0.1–3 mm ensures both good optical reflection performance and facilitates the processing and shaping of the elongated groove.

[0062] As one embodiment of this utility model, the ratio of the thickness H0 of the back glass 3 to the depth H2 of the elongated groove is 50 to 300.

[0063] In this embodiment, the ratio of the thickness H0 of the back glass 3 to the depth H2 of the elongated groove is controlled to be 50 to 300. This ensures both the good optical reflection performance of the elongated groove and the good structural strength of the back glass 3, thus achieving an optimized design of the depth of the elongated groove and the thickness of the back glass 3.

[0064] As another embodiment of this utility model, when the first reflective structure 30 is a combination of an elongated protrusion and an elongated groove, that is, a portion of the outer surface 31 is provided with an elongated protrusion as the first reflective structure 30 and a portion of the outer surface 31 is provided with an elongated groove as the first reflective structure 30, the light reflection effects of the elongated protrusion and the elongated groove can be comprehensively utilized, and the structural strength of the back glass 3 can be balanced by using the elongated protrusion and the elongated groove.

[0065] As an embodiment of the present invention, each first reflective structure 30 includes at least two intersecting reflective surfaces 301, and the two reflective surfaces 301 have equal angles with the horizontal plane of the back glass 3.

[0066] In this embodiment, each first reflective structure 30 includes at least two intersecting reflective surfaces 301. The angle between the two reflective surfaces 301 and the horizontal plane of the back glass 3 is equal. The at least two reflective surfaces 301 can further enhance the reflection effect of the first reflective structure 30 on sunlight and improve the utilization rate of sunlight by the solar cell 11.

[0067] Please refer to Figures 3-4 As an embodiment of the present invention, each first reflective structure 30 extends along the second direction X, and multiple first reflective structures 30 are arranged in parallel intervals along the first direction Y.

[0068] In this embodiment, the first reflective structure 30 can be an elongated protrusion, an elongated groove, or a combination of both. The second direction X intersects the first direction Y. Optionally, the second direction X and the first direction Y are perpendicular to each other. Each first reflective structure 30 extends along the second direction X, that is, the first reflective structure 30 extends along the width direction of the back glass 3. Multiple first reflective structures 30 are arranged in parallel intervals along the first direction Y, which facilitates each first reflective structure 30 reflecting sunlight onto the battery cells 11 of the multiple battery strings 1. The multiple first reflective structures 30 can be equally spaced or non-equally spaced.

[0069] In this embodiment, when the first reflective structure 30 extends along the second direction X, the length of the first reflective structure 30 is greater than two-thirds of the width of the back glass 3. This can be understood as all the first reflective structures 30 having a length greater than two-thirds of the width of the back glass 3, or at least one first reflective structure 30 having a length greater than two-thirds of the width of the back glass 3. This is beneficial for further improving the reflection effect of the first reflective structures 30 on sunlight passing through the solar cell 11 or sunlight passing through the gaps between the solar cell strings 1. Preferably, the length of each first reflective structure 30 is greater than two-thirds of the width of the back glass 3. The length of each first reflective structure 30 can also be equal to the width of the back glass 3, that is, the length of each first reflective structure 30 is greater than two-thirds of the width of the back glass 3, and the length of each first reflective structure 30 is less than or equal to the width of the back glass 3.

[0070] As one embodiment of this utility model, the angle C between the reflective surface 301 and the horizontal plane of the back glass 3 is 35° to 45°.

[0071] In this embodiment, the angle C between the reflective surface 301 and the horizontal plane of the back glass 3 is 35° to 45°, which can further maximize the total reflection of sunlight perpendicular to the back glass 3 onto the solar cell 11, thereby further improving the utilization rate of sunlight by the solar cell 11. For example, the angle C between the reflective surface 301 and the horizontal plane of the back glass 3 can be any value among 35°, 38°, 40°, 42°, 43°, and 45°.

[0072] Please refer to Figure 9 In another embodiment of the present invention, the length direction of the back glass 3 is arranged along the first direction Y, and each first reflective structure 30 extends along the first direction Y.

[0073] In this embodiment, the first reflective structure 30 can be an elongated protrusion, an elongated groove, or a combination of both. Each first reflective structure 30 extends along a first direction Y, that is, it extends along the length of the back glass 3. Multiple first reflective structures 30 are sequentially spaced along a second direction X, facilitating the reflection of sunlight onto the battery cells 11 of the same battery string 1. The multiple first reflective structures 30 can be equally spaced or non-equally spaced.

[0074] In one embodiment of this utility model, the length of the first reflective structure 30 is greater than two-thirds of the length of the back glass 3. This can be understood as all first reflective structures 30 having a length greater than two-thirds of the length of the back glass 3, or at least one first reflective structure 30 having a length greater than two-thirds of the length of the back glass 3. This is beneficial for further improving the reflection effect of the first reflective structures 30 on sunlight transmitted through the solar cell 11 or sunlight transmitted through the gaps between the solar cell strings 1. Preferably, the length of each first reflective structure 30 is greater than two-thirds of the length of the back glass 3. The length of each first reflective structure 30 can also be equal to the length of the back glass 3, that is, the length of the first reflective structure 30 is greater than two-thirds of the length of the back glass 3 and less than or equal to the length of the back glass 3.

[0075] Please refer to Figure 10 As another embodiment of the present invention, the first reflective structure 30 extends along the third direction Z, and the third direction Z intersects with the first direction Y and the second direction X.

[0076] In this embodiment, the first reflective structure 30 can be an elongated protrusion, an elongated groove, or a combination of both. In this embodiment, since the first reflective structure 30 extends along the third direction Z, meaning its length direction is not the same as the length or width direction of the back glass 3, the first reflective structure 30 can span the battery cells 11 of multiple battery strings 1. This facilitates each first reflective structure 30 reflecting a portion of the sunlight transmitted through the front of the battery string 1 onto the battery cells 11 within the multiple different battery strings 1, further improving sunlight utilization. The angles between the third direction Z and the first direction Y, and between the third direction Z and the second direction X, are not limited; they can be equal or unequal.

[0077] As an embodiment of this utility model, the angle between the third direction Z and the first direction Y and the angle between the third direction Z and the second direction X are equal, that is, the angle between the third direction Z and the first direction Y and the angle between the third direction Z and the second direction X are both 45°. This can effectively balance the reflection effect of each first reflection structure 30 reflecting sunlight to the battery cells 11 of the adjacent battery string 1 and the reflection effect of each first reflection structure 30 reflecting sunlight to the battery cells 11 in each battery string 1, which can further improve the utilization rate of sunlight.

[0078] In one possible embodiment, each first reflective structure 30 includes a plurality of pyramidal structures, which are arranged linearly and sequentially at intervals. For example, the pyramidal structures can be triangular pyramidal structures or quadrangular pyramidal structures.

[0079] For example, the plurality of pyramidal structures of each first reflective structure 30 are arranged linearly and sequentially along the third direction Z. On the one hand, the back glass 3 can use the plurality of pyramidal structures to reflect sunlight transmitted through the front of the battery string 1 onto the battery cell 11. On the other hand, since each first reflective structure 30 is arranged along the third direction Z, the plurality of pyramidal structures of each first reflective structure 30 can reflect part of the sunlight onto the battery cell 11 of the adjacent battery string 1, and each first reflective structure 30 can reflect part of the sunlight onto the battery cell 11 within each battery string 1, which can further improve the utilization rate of sunlight.

[0080] Please refer to the reference. Figure 11 As an embodiment of this utility model, the back glass 3 also includes an inner surface 32 disposed near the first encapsulant film 2, and the inner surface 32 is provided with a plurality of second reflective structures 321. On the one hand, the second reflective structures 33 can further increase the reflection effect of sunlight transmitted through the front of the battery string by the back glass 3. On the other hand, the second reflective structures 33 disposed on the inner surface 32 can increase the friction between the back glass 3 and the first encapsulant film 2, which can prevent the back glass 3 and the first encapsulant film 2 from shifting relative to each other during the lamination process, thereby improving the lamination reliability of the solar cell module.

[0081] As one embodiment of this utility model, the second reflective structure 33 is one or a combination of at least two of the following: a pyramid, a long strip protrusion, or a long strip groove.

[0082] In this embodiment, the second reflective structure 33 and the first reflective structure 30 can have the same or different structures. For example, the first reflective structure 30 can be an elongated protrusion, and the second reflective structure 33 can also be an elongated protrusion; or the first reflective structure 30 can be an elongated groove, and the second reflective structure 33 can also be an elongated groove; or the first reflective structure 30 can be an elongated protrusion, and the second reflective structure 33 can be a pyramid.

[0083] When the second reflective structure 33 has the same structure as the first reflective structure 30, their dimensions can be different. When the second reflective structure 33 and the first reflective structure 30 have the same structure, it facilitates the processing of the back glass 3. When the second reflective structure 33 and the first reflective structure 30 have different structures, that is, when a combination of second reflective structures 33 and first reflective structures 30 with different structures is used, it is beneficial to adjust the light reflection effect of the back glass 3.

[0084] As an embodiment of the present invention, the solar cell module further includes a second encapsulating film 4 on the front side 101 of the battery string 1 and a front glass 5 disposed on the side of the second encapsulating film 4 away from the battery string 1, thereby encapsulating the front side of the battery string 1 using the second encapsulating film 4 and the front glass 5.

[0085] To demonstrate the technical effectiveness of the embodiments of this utility model, seven sets of comparative experiments were conducted:

[0086] In the control group 1, the outer surface 31 of the back glass 3 of the solar cell module has a planar structure; in the experimental group 1, the outer surface 31 of the back glass 3 has multiple elongated protrusions extending along the first direction Y; in the experimental group 2, the outer surface 31 of the back glass 3 has multiple elongated protrusions extending along the second direction X; in the experimental group 3, the outer surface 31 of the back glass 3 has multiple elongated grooves extending along the first direction Y; in the experimental group 4, the outer surface 31 of the back glass 3 has multiple elongated grooves extending along the second direction X; in the experimental group 5, the outer surface 31 of the back glass 3 has multiple elongated protrusions extending along the third direction Z; and in the experimental group 6, the outer surface 31 of the back glass 3 has multiple elongated grooves extending along the third direction Z. Under the same simulated illumination conditions, the effective utilization rate of incident light for each group of solar cell modules is shown in the table below:

[0087] serial number Incident light effective utilization rate Control Group 1 85.78％ Experimental Group 1 86.02％ Experimental Group 2 86.03％ Experimental Group 3 86.01％ Experimental Group 4 85.99％ Experimental Group 5 86.04％ Experimental Group Six 86.05％

[0088] As can be seen from the table above, the outer surface 31 of the back glass 3 is provided with the first reflection structure 30 of this utility model. Compared with the outer surface 31 of the back glass 3 being a planar structure, the first reflection structure 30 of this utility model can effectively improve the effective utilization rate of incident light, increase the utilization rate of sunlight by the battery cell 11, and thus improve the power of the solar cell module.

[0089] This utility model embodiment also provides a photovoltaic system, which includes the solar cell module of the above embodiment. It should be noted that the photovoltaic system has the same or similar beneficial effects as the solar cell module described above, and the related parts between the two can be referred to each other. To avoid repetition, they will not be described again here.

[0090] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system grid as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple back-contact solar cell modules. For example, multiple back-contact solar cell modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0091] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A solar cell module, characterized in that, include: Multiple battery strings, each battery string including multiple battery cells arranged sequentially along a first direction, the battery string including a front side and a back side arranged opposite to each other; A first adhesive film disposed on the back side of the battery string; and The back glass is disposed on the side of the first adhesive film away from the battery string. The back glass includes an outer surface disposed away from the first adhesive film. The outer surface is provided with a plurality of first reflective structures. The first reflective structure is an elongated protrusion or an elongated groove. The first reflective structure has at least one reflective surface. The angle between the reflective surface and the horizontal plane of the back glass is 30° to 46°.

2. The solar cell module according to claim 1, characterized in that, The length direction of the back glass is set along the first direction, and the width direction of the back glass is set along the second direction; each of the first reflective structures extends along the first direction, and a plurality of the first reflective structures are arranged in parallel intervals along the second direction.

3. The solar cell module according to claim 2, characterized in that, The length of the first reflective structure is greater than two-thirds of the length of the back glass.

4. The solar cell module according to claim 1, characterized in that, The length direction of the back glass is set along the first direction, and the width direction of the back glass is set along the second direction; each of the first reflective structures extends along the second direction, and a plurality of the first reflective structures are arranged in parallel intervals along the first direction.

5. The solar cell module according to claim 4, characterized in that, The length of the first reflective structure is greater than two-thirds of the width of the back glass.

6. The solar cell module according to claim 1, characterized in that, The length direction of the back glass is set along the first direction, and the width direction of the back glass is set along the second direction; the first reflective structure extends along a third direction, and the third direction intersects with both the first direction and the second direction.

7. The solar cell module according to claim 6, characterized in that, The angle between the third direction and the first direction is equal to the angle between the third direction and the second direction.

8. The solar cell module according to claim 1, characterized in that, The elongated protrusion is positioned opposite the outer surface, and the reflective surface is the side surface of the elongated protrusion.

9. The solar cell module according to claim 1, characterized in that, The elongated groove is recessed on the outer surface, and the reflective surface is the inner surface of the elongated groove.

10. The solar cell module according to claim 1, characterized in that, The angle between the reflective surface and the horizontal plane of the back glass is 35° to 45°.

11. The solar cell module according to claim 1, characterized in that, Each of the first reflective structures includes at least two intersecting reflective surfaces, the two reflective surfaces forming an angle equal to the horizontal plane of the back glass.

12. The solar cell module according to claim 1, characterized in that, The ratio of the thickness of the back glass to the height of the elongated protrusion is 10 to 200; and / or the ratio of the thickness of the back glass to the depth of the elongated groove is 50 to 300.

13. The solar cell module according to claim 1, characterized in that, The width of the elongated groove is 0.1 to 3 mm; and / or the width of the elongated protrusion is 0.1 to 3 mm.

14. The solar cell module according to claim 1, characterized in that, The back glass includes an inner surface disposed near the first adhesive film, and the inner surface is provided with a plurality of second reflective structures.

15. The solar cell module according to claim 14, characterized in that, The second reflective structure is one or a combination of at least two of the following: a pyramid, a long strip protrusion, or a long strip groove.

16. A photovoltaic system, characterized in that, Includes the solar cell module as described in any one of claims 1 to 15.

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