Production process of photovoltaic back glass, back glass and photovoltaic module

Abstract

The present application belongs to photovoltaic technical field, disclose photovoltaic back glass production process, back glass and photovoltaic module. Through the float process production glass, after forming glass band, on the side of glass band roll forming embossing structure, and simultaneously form black metal layer on embossing structure, make glass band with black metal layer into annealing kiln and anneal to form glass body, then form the reflecting aluminum layer on the surface of black metal layer, compared with the enamel glass, through the photovoltaic back glass production process produced back glass, mechanical properties are stronger, and completely solve the enamel glass after PID aging experiment glaze layer blackening problem, in addition, can bring higher optical gain for photovoltaic module, and the back glass is coated with inorganic material, can improve the weather resistance of the back glass, improve the service life of photovoltaic module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic, in particular to a production process of photovoltaic back glass, back glass and photovoltaic module. BACKGROUND

[0002] At present, the back glass of photovoltaic double glass module adopts two schemes to improve power. The first scheme is to coat glaze on the back glass. Since the expansion coefficient of the glaze is inconsistent with the expansion coefficient of the glass, the mechanical properties of the coated glass are reduced, the glaze position is easy to break, and the glaze position is easy to appear black phenomenon after the module is subjected to PID aging test. The second scheme is to not coat glaze on the back glass to maintain its good mechanical properties, and to replace the coating glaze with gap film. Since the film belt of the gap film is an organic material, its reliability is poorer than that of inorganic material.

[0003] Therefore, there is an urgent need for a production process of photovoltaic back glass, back glass and photovoltaic module to solve the problems in the prior art. SUMMARY

[0004] The purpose of the present application is to provide a production process of photovoltaic back glass, which can improve the optical gain of the photovoltaic module and improve the power of the photovoltaic module.

[0005] To achieve this purpose, the present application adopts the following technical scheme:

[0006] The production process of photovoltaic back glass comprises:

[0007] S100, forming a glass belt in a tin bath by melting glass liquid;

[0008] S200, forming an embossed structure on one side of the glass belt by rolling, and simultaneously forming a black metal layer on the embossed structure;

[0009] S300, making the glass belt with the black metal layer enter an annealing kiln to form a glass body by annealing;

[0010] S400, spraying aluminum powder on the black metal layer to form a reflective aluminum layer on the surface of the black metal layer.

[0011] Optionally, forming the black metal layer on the embossed structure comprises:

[0012] S210, spraying black powder towards the glass belt while rolling the glass belt, and pressing the black powder on the embossed structure to form the black metal layer.

[0013] Optionally, the thickness of the black metal layer is 15-100 microns.

[0014] Optionally, if the hot melting temperature of the black powder is greater than the surface temperature value of the glass ribbon, after spraying the black powder towards the glass ribbon while rolling the glass ribbon, it further comprises:

[0015] Heating the black powder to a hot melting state, and the hot melting black powder is attached to the embossed structure to form the black metal layer.

[0016] Optionally, the heating time of the black powder is set to 3s-5s.

[0017] Optionally, before forming the reflective aluminum layer on the surface of the black metal layer, it comprises cutting the glass body to the required size.

[0018] Optionally, the thickness of the reflective aluminum layer is 105-135um.

[0019] Optionally, after forming the reflective aluminum layer on the surface of the black metal layer, it further comprises:

[0020] S410, heating the reflective aluminum layer to a hot melting temperature, and the heating temperature is 1-10℃ higher than the hot melting temperature of the reflective aluminum layer, and the heating time is set to 1s-5s.

[0021] The purpose of the present application is to provide a backplane glass, which has the advantages of high strength, strong stability and strong weather resistance.

[0022] To achieve this purpose, the present application adopts the following technical solutions:

[0023] The backplane glass is produced by the production process of any one of the above-mentioned photovoltaic back glass, and the backplane glass comprises a glass body, one side of the glass body is provided with an embossed structure, the embossed structure is provided with a black metal layer, and the black metal layer is covered with a reflective aluminum layer.

[0024] The purpose of the present application is to provide a photovoltaic module, which uses the above-mentioned backplane glass, can improve the optical gain of the photovoltaic module, and improve the power of the photovoltaic module.

[0025] To achieve this purpose, the present application adopts the following technical solutions:

[0026] The photovoltaic module comprises a cover glass, a cell piece and the above-mentioned backplane glass, a plurality of cell pieces are arranged in an array between the cover glass and the backplane glass, and the side of the backplane glass provided with the embossed structure faces the cell piece.

[0027] Advantages:

[0028] The application provides a production process of photovoltaic back glass, which comprises the following steps: producing glass by a float production process; rolling a glass belt to form an embossing structure on one side of the glass belt after the glass belt is formed; forming a black metal layer on the embossing structure; making the glass belt with the black metal layer enter an annealing kiln to form a glass body; and forming a reflective aluminum layer on the surface of the black metal layer. Compared with the enamel glass, the back glass produced by the production process has stronger mechanical properties, and the problem of blackening of the enamel layer of the enamel glass after a PID aging experiment is solved completely. In addition, the back glass can bring higher optical gain to a photovoltaic module, and the inorganic material coated on the back glass can improve the weather resistance of the back glass and the service life of the photovoltaic module.

[0029] The back glass produced by the production process has high strength, good reliability and weather resistance, and long service life, and can improve the optical gain of the photovoltaic module and the power of the photovoltaic module.

[0030] The photovoltaic module comprises a cover glass, a cell piece and the back glass, the cell piece is located between the cover glass and the back glass, and the reflective aluminum layer is located at the gap of the cell piece. The reflective aluminum layer can reflect the light incident on the gap back to the cell piece, greatly improving the optical gain of the photovoltaic module and the power of the photovoltaic module. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flow chart of the float glass production process provided by the first embodiment of the application;

[0032] Figure 2 is a specific production equipment of the float glass production process provided by the first embodiment of the application Figure 1 ;

[0033] Figure 3 is a specific production equipment of the float glass production process provided by the first embodiment of the application Figure 2 ;

[0034] Figure 4 is a structural schematic view of the first pressing roller provided by the first embodiment of the application.

[0035] In the figure:

[0036] 10, glass belt; 11, first embossing; 12, second embossing; 1, transition roller table; 2, first pressing roller mechanism; 21, first support frame; 22, first pressing roller; 221, roller body; 222, conical gear tooth; 3, moving mechanism; 31, second support frame; 32, slide rail; 4, second pressing roller mechanism; 41, vertical rod; 42, second pressing roller; 5, annealing kiln; 6, tin bath; 61, edge trimmer; 7, tank kiln. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] 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.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] Example 1

[0042] This embodiment provides a manufacturing process for photovoltaic back glass, used to produce backsheet glass for photovoltaic modules, in order to improve the mechanical properties and reliability of the backsheet glass.

[0043] like Figure 1 As shown, the manufacturing process of the photovoltaic back glass provided in this embodiment mainly includes:

[0044] S100, to form a glass strip 10 in the tin bath 6 by the molten glass liquid;

[0045] S200, roll forming an embossed structure on one side of the glass strip 10, and simultaneously forming a black metal layer on the embossed structure;

[0046] S300, the glass strip 10 with a black metal layer is put into the annealing furnace 5 for annealing to form a glass body.

[0047] S400: Aluminum powder is sprayed onto a black metal layer to form a reflective aluminum layer on the surface of the black metal layer.

[0048] The photovoltaic back glass production process provided in this embodiment uses a float glass production process. After forming the glass strip 10, an embossed structure is formed on one side of the glass strip 10 by roll forming, and a black metal layer is formed on the embossed structure at the same time. The glass strip 10 with the black metal layer is then sent to an annealing furnace 5 for annealing to form the glass body. Then, a reflective aluminum layer is formed on the surface of the black metal layer. Compared with glazed glass, the back glass produced by this photovoltaic back glass production process has stronger mechanical properties and completely solves the problem of glaze blackening after PID aging test of glazed glass. In addition, it can bring higher optical gain to the photovoltaic module. Furthermore, the back glass is coated with an inorganic material, which can improve the weather resistance of the back glass and extend the service life of the photovoltaic module.

[0049] The following is combined with Figures 2-4 This embodiment details the production process of the photovoltaic back glass.

[0050] The manufacturing process of photovoltaic back glass includes:

[0051] Step 1: Allow the molten glass in furnace 7 to enter tin bath 6.

[0052] Step 2: Form a glass strip 10 in the molten glass bath 6.

[0053] Specifically, the molten glass floats on the surface of molten tin, which has a relatively high density. Under the action of gravity and surface tension, the molten glass spreads and flattens on the tin surface, forming a glass strip 10 with flat upper and lower surfaces.

[0054] An edge-pulling machine 61 is installed inside the tin bath 6. The edge-pulling machine 61 is used to adjust the thickness of the glass strip 10. The edge-pulling machine 61 can achieve uniform adjustment of the thickness of the glass strip 10, ensuring that the glass strip 10 has a consistent thickness throughout the entire width range, so as to ensure that the required thickness and quality of the glass strip 10 are achieved.

[0055] The backsheet glass produced using this photovoltaic backsheet glass manufacturing process, specifically the float glass process, has superior mechanical properties.

[0056] Step 3: Roller press one side of the glass strip 10 to form an embossed structure, and at the same time form a black metal layer on the embossed structure.

[0057] Specifically, a transition roller table 1 and an embossing roller device are located downstream of the tin bath 6. The embossing roller device is positioned directly above the transition roller table 1, and the formed glass ribbon 10 is drawn onto the transition roller table 1. Before the glass ribbon 10 enters the annealing furnace 5, the surface temperature of the glass ribbon 10 reaches as high as 1000°C. At this time, the glass ribbon 10 is not fully hardened and its shape is malleable. As the transition roller table 1 pulls the glass ribbon 10, the embossing roller device on the transition roller table 1 engraves an embossed structure on the glass ribbon 10 and simultaneously forms a black metallic layer.

[0058] In this embodiment, the thickness of the black metal layer is 15μm-100μm. An appropriate thickness range can reduce material waste and achieve better reflective effect of the reflective aluminum layer. The black powder can generally be copper oxide, iron oxide black, cobalt black, copper chromium black, or a mixture thereof.

[0059] Optionally, black powder is sprayed towards the glass strip 10 while it is being rolled, and the black powder is then pressed onto the embossed structure to form a black metallic layer. Combining the black powder spraying and pressing with the glass strip rolling process simplifies the process flow and increases the adhesion and uniformity of the metallic layer. This integrated process reduces production steps, thereby improving production efficiency.

[0060] If the melting temperature of the black powder is greater than the surface temperature of the glass strip 10, the black powder is heated to a melting state. The melted black powder adheres to the embossed structure to form a black metal layer, so that the black metal layer can better adhere to the glass strip 10.

[0061] Optionally, a first infrared heating device is used to heat the black powder. After the black powder on the embossed structure reaches its melting point, it adheres to the glass strip 10. The specific heating temperature and time can be selected according to the type of black powder. The heating time is generally 3-5 seconds, and the heating temperature corresponds to the hot melting temperature of the black powder.

[0062] If the melting temperature of the black powder is lower than the surface temperature of the glass strip 10, the black powder can be melted directly using the temperature of the glass strip 10 itself, without the need for additional heating, so that the formed black metal layer can be better attached to the glass strip 10.

[0063] In this embodiment, a black metal layer is formed on the glass strip 10. Compared with glazed glass, this completely solves the problem of the glaze turning black after the PID aging test. In addition, it can bring higher optical gain. Furthermore, the backsheet glass is coated with inorganic materials, which can improve the weather resistance of the backsheet glass and extend the service life of the photovoltaic module.

[0064] In this embodiment, black powder is sprayed while rolling, and the black powder is printed on the embossed structure to form a black metal layer. This process is achieved using an embossing roller pressing device.

[0065] The embossing roller device includes a first roller mechanism 2, a moving mechanism 3, and a second roller mechanism 4. The first roller mechanism 2 is used to press black powder onto the glass belt 10 along a first direction to form a first embossing. The second roller mechanism 4 is disposed on the moving end of the moving mechanism 3. The moving mechanism 3 is used to drive the second roller mechanism 4 to move, and the moving direction is at an acute angle to the first direction. The second roller mechanism 4 is used to press black powder onto the glass belt 10 along a second direction to form a second embossing. The first direction is perpendicular to the second direction, thereby forming a special embossed structure with interlaced horizontal and vertical lines on the glass belt 10 before the glass belt 10 enters the annealing furnace 5.

[0066] Optionally, such as Figures 2-3 As shown, the first pressure roller mechanism 2 includes a first support frame 21, a first material box, and a first pressure roller 22. The first support frame 21 spans the transition roller table 1, and the crossbar of the first support frame 21 is perpendicular to the glass strip 10. Multiple first pressure rollers 22 are spaced apart on the crossbar of the first support frame 21 along a second direction. The first pressure rollers 22 can rotate under external force. The glass strip 10 moves continuously and uniformly on the transition roller table 1, while the crossbar of the first support frame 21 remains stationary. The first pressure rollers 22 on the crossbar are in close contact with the surface of the glass strip 10. The movement of the glass strip 10 drives the first pressure rollers 22 to rotate around their fixed axes, and rolls a first embossed pattern onto the glass strip 10. The first material box is set on the first support frame 21 and contains black powder. The first material box has a first opening corresponding to the first pressure roller 22. As the first pressure roller 22 rotates, it can scrape away the black powder at the first opening and imprint the black powder onto the glass strip 10 along the first direction.

[0067] Optionally, the first pressure roller 22 includes a roller shaft, a roller body 221 and conical teeth 222. The roller shaft is connected to the first support frame 21. The roller body 221 rotates freely around the roller shaft. Multiple conical teeth 222 are evenly distributed along the circumference of the roller body 221. As the roller body 221 rotates, a uniform first embossing can be formed on the glass belt 10.

[0068] Specifically, after the first pressure roller 22 engraves on the glass belt 10 body, the depth of a single engraving is greater than 0 μm and less than or equal to 50 μm, and the spacing between the peaks of two adjacent engravings is 50 μm.

[0069] like Figure 4As shown, the large end of the conical etched tooth 222 is connected to the roller body 221. The height of the conical etched tooth 222 is greater than 0 μm and less than or equal to 50 μm, which is 0-50 μm. The width of the conical etched tooth 222 is greater than 0 μm and less than 50 μm. After being engraved on the glass strip, the spacing between two adjacent peaks is 0.5 μm with a line engraving accuracy.

[0070] Optionally, the moving mechanism 3 includes a second support frame 31, a linear motion assembly, and a drive unit. The second support frame 31 is obliquely spanned across the transition roller table 1. The linear motion assembly is mounted on the second support frame 31. The drive unit is connected to the input end of the linear motion assembly, and the second pressure roller mechanism 4 is connected to the output end of the linear motion assembly. Driven by the drive unit, the second pressure roller mechanism 4 can reciprocate at a uniform speed along the inclined second support frame 31, thereby forming a second embossing extending in the second direction on the glass belt 10. It should be noted that the movement speed of the second pressure roller mechanism 4 is jointly determined by the inclination angle of the second support frame 31 and the movement speed of the glass belt 10. As long as the second pressure roller mechanism 4 moves from one side of the glass belt 10 to the other side, the second embossing formed on the glass belt 10 is a straight line.

[0071] Optionally, the linear motion assembly includes a slide rail 32 and a pulley. The slide rail 32 is mounted on the second support frame 31, and the pulley is slidably connected to the slide rail 32 and connected to the output end of the drive component. The second pressure roller mechanism 4 is connected to the pulley, and the drive component drives the pulley to slide along the slide rail 32, thereby causing the second pressure roller mechanism 4 to move at a uniform speed along the slide rail 32. The slide rail 32 and pulley structure of the linear motion assembly can achieve smooth and precise movement of the glass belt 10, reduce friction and energy loss, and improve production efficiency and equipment lifespan.

[0072] Optionally, the second pressure roller mechanism 4 includes a longitudinal rod 41, a second material box, and a second pressure roller 42. The longitudinal rod 41 is connected to a pulley. Multiple second pressure rollers 42 are spaced apart on the longitudinal rod 41 along a first direction. The second material box is disposed on the longitudinal rod 41 and contains black powder. The second material box has a second opening corresponding to the second pressure roller 42. When the second pressure roller 42 rotates and passes the second opening, it scrapes away the black powder at the second opening. As the second pressure roller 42 rotates, it presses the black powder onto the glass belt 10 along a second direction, forming a second embossing.

[0073] It should be noted that the second pressure roller 42 in this embodiment has the same structure as the first pressure roller 22, and will not be described again here.

[0074] Step 4: The glass strip 10 with the embossed structure and black metal layer is put into the annealing furnace 5 for annealing to form the glass body.

[0075] Specifically, a glass strip 10 with a ferrous metal layer is annealed in an annealing furnace 5 to form the glass body. During the manufacturing process, stress is generated inside the glass strip 10. Annealing releases this stress, thereby reducing the risk of breakage, damage, and deformation. Annealing improves the physical properties of the glass, increasing its resistance to external environmental factors and thus enhancing the durability of the backing glass.

[0076] Step 5: Cut the glass body to the required size.

[0077] Cutting the glass body to the required size facilitates customization, reduces waste, improves production efficiency, and ensures consistency. The cut glass body then requires further processing such as edge grinding, corner trimming, drilling, and tempering.

[0078] Step 6: Spray aluminum powder onto the black metal layer to form a reflective aluminum layer on the surface of the black metal layer.

[0079] The reflective aluminum layer has a high reflectivity, which can reflect incident light back onto the solar cells of the photovoltaic module, helping to improve the photoelectric conversion efficiency and energy utilization efficiency of the photovoltaic module. The reflective aluminum layer also has high thermal radiation reflection performance. By reflecting thermal radiation, it can reduce heat absorption on the backsheet glass surface, reduce the temperature rise of the photovoltaic module, and improve the efficiency and stability of photovoltaic power generation.

[0080] Optionally, the thickness of the reflective aluminum layer is 105μm-135μm. By adjusting the thickness of the reflective aluminum layer, the light propagation and absorption characteristics can be optimized, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0081] Step 7: Heat the reflective aluminum layer to its melting temperature, and the heating temperature should be 1℃-10℃ higher than the melting temperature of the reflective aluminum layer. The heating time should be set to 1s-5s.

[0082] Specifically, a second infrared heating device is used to heat the reflective aluminum layer to its melting temperature. Heating the reflective aluminum layer to this temperature in a short time achieves better bonding. The heating temperature is only 1-10°C higher than the aluminum powder's melting temperature, and the heating time is 1-5 seconds. This is because the reflective aluminum layer is relatively thick, preventing it from reaching temperatures far exceeding its melting point after heating. Otherwise, the aluminum layer would melt and flow, filling the embossed structure and failing to form a reflective structure.

[0083] Example 2

[0084] This embodiment provides a backplane glass, which is produced using the photovoltaic backplane glass production process provided in Embodiment 1. The backplane glass includes a glass body, an embossed structure on one side of the glass body, a black metal layer on the embossed structure, and a reflective aluminum layer covering the black metal layer. This backplane glass has high strength, good reliability and weather resistance, and a long service life.

[0085] Example 3

[0086] This embodiment provides a photovoltaic module, which includes an outer frame, a cover glass, solar cells, and a backsheet glass as described in Embodiment 2. Multiple solar cells are arranged in an array on the cover glass and the backsheet glass, and are electrically connected to each other. The backsheet glass has an embossed structure facing the solar cells, and each solar cell is located within a rectangular space enclosed by the embossed structure. The outer frame surrounds the outer perimeter of the cover glass and the backsheet glass. This photovoltaic module combines an optimized backsheet glass structure, a solar cell array design, and a compact outer frame layout, thereby improving the performance of the photovoltaic module, enhancing structural stability, and strengthening weather resistance. This design can increase the power output of the photovoltaic module, thus providing a more efficient and stable energy output for the solar photovoltaic system.

[0087] Example 4

[0088] This embodiment provides a photovoltaic module, which includes a cover glass, a front encapsulating film, a rear encapsulating film for each cell, and a back glass as described in Embodiment 2. Multiple cells are arranged in an array between the cover glass and the back glass. One side of each cell is connected to the cover glass through the front encapsulating film, and the other side of each cell is connected to the back glass through the rear encapsulating film. The side of the back glass with the embossed structure faces the cells. Each cell is located within a rectangular space enclosed by the embossed structure. A reflective aluminum layer is located at the gaps between the cells. The reflective aluminum layer can reflect the light incident on the gaps back onto the cells, which can greatly improve the optical gain of the photovoltaic module and thus increase the power of the photovoltaic module.

[0089] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. The manufacturing process of photovoltaic back glass, characterized in that, include: S100, to form a glass ribbon (10) in the molten glass bath (6); S200, roll forming an embossed structure on one side of the glass strip (10), and simultaneously forming a black metal layer on the embossed structure; Forming the black metallic layer on the embossed structure includes: S210. While rolling the glass strip (10), spray black powder toward the glass strip (10) and press the black powder onto the embossed structure to form the black metal layer. S300, the glass strip (10) with the black metal layer is annealed in the annealing furnace (5) to form a glass body; S400: Aluminum powder is sprayed onto a black metal layer to form a reflective aluminum layer on the surface of the black metal layer.

2. The manufacturing process for photovoltaic back glass according to claim 1, characterized in that, The thickness of the black metal layer is 15μm-100μm.

3. The manufacturing process for photovoltaic back glass according to claim 1, characterized in that, If the melting temperature of the black powder is greater than the surface temperature of the glass strip (10), the process of spraying the black powder toward the glass strip (10) while rolling the glass strip (10) further includes: The black powder is heated to a molten state, so that the molten black powder adheres to the embossed structure to form the black metal layer.

4. The manufacturing process for photovoltaic back glass according to claim 3, characterized in that, The heating time for heating the black powder is set to 3-5 seconds.

5. The manufacturing process for photovoltaic back glass according to claim 1, characterized in that, Before forming the reflective aluminum layer on the surface of the black metal layer, the glass body is cut to the required size.

6. The manufacturing process for photovoltaic back glass according to claim 1, characterized in that, The thickness of the reflective aluminum layer is 105μm-135μm.

7. The manufacturing process for photovoltaic back glass according to claim 1, characterized in that, After forming the reflective aluminum layer on the surface of the black metal layer, the process further includes: S410. Heat the reflective aluminum layer to its hot melt temperature, and the heating temperature is 1℃-10℃ higher than the hot melt temperature of the reflective aluminum layer, and the heating time is set to 1s-5s.

8. A backsheet glass, manufactured using the photovoltaic backsheet glass manufacturing process described in any one of claims 1-7, characterized in that, The back panel glass includes a glass body, one side of which is provided with an embossed structure, a black metal layer is provided on the embossed structure, and a reflective aluminum layer is covered on the black metal layer.

9. A photovoltaic module, characterized in that, It includes a cover glass, battery cells, and a back glass as described in claim 8, wherein a plurality of the battery cells are arranged in an array between the cover glass and the back glass, and the side of the back glass with the embossed structure faces the battery cells.

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