Homogeneous glass double-glass photovoltaic module laser melting packaging method and homogeneous glass double-glass photovoltaic module laser melting packaging structure

Abstract

The invention relates to the technical field of photovoltaic module packaging, in particular to a homogeneous glass double-glass photovoltaic module laser melting packaging method and a homogeneous glass double-glass photovoltaic module laser melting packaging structure. A battery array is placed in a groove formed in the middle of front panel glass; the rear cover plate glass is attached to the front panel glass from the upper portion. The packaging material is crosslinked to form a laminated piece; the femtosecond laser moves along the laser melting area, welding is carried out at the contact position of the front panel glass and the rear cover plate glass, and continuous closed melting marks are formed; according to the method and the corresponding structure for physically isolating the battery array in the assembly by continuously sealing the melting marks, external water vapor is thoroughly prevented from entering and contacting a channel for packaging the battery, and the situation that harmful substances are decomposed by reacting with the water vapor in a packaging material and contact with the battery to cause corrosion of the battery is prevented; the service life of the photovoltaic module is prolonged, a blank space for reserving a creepage distance is canceled, the material cost is further reduced, and the application range of the photovoltaic module is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module packaging, and in particular to a laser melting packaging method for a double-glass photovoltaic module of homogeneous glass and a structure thereof. Background Art

[0002] In the field of photovoltaic module manufacturing, packaging technology has always been a key factor affecting module performance and lifespan. Conventional photovoltaic module packaging methods mainly include glass-to-glass packaging and glass-to-backsheet packaging. While these two packaging methods can protect photovoltaic cells from environmental corrosion to a certain extent, they still pose the problem of water vapor penetration. Specifically, in glass-to-glass packaging, because the gap between the two glass panes is difficult to completely seal, water vapor easily penetrates through the gap and then chemically reacts with the surface of the encapsulated photovoltaic cell and the decomposition products of the solder ribbon and packaging material. These chemical reactions not only cause corrosion and contamination of the cell surface, but also may affect the cell's electrical performance, such as reduced insulation resistance and increased leakage current, seriously affecting the efficiency and lifespan of the photovoltaic module. In glass-to-backsheet packaging, although the backsheet can block water vapor penetration to a certain extent, long-term use and environmental corrosion can still cause the backsheet to age and crack, allowing water vapor to penetrate through the backsheet. Similarly, this infiltrated water vapor chemically reacts with the photovoltaic cell surface and the packaging material, resulting in a decrease in cell efficiency and a shortened module lifespan. Especially for battery types that are very sensitive to moisture, such as heterojunction batteries, the transparent conductive oxide layer on their surface is easily invalidated under the action of moisture, resulting in a sharp decline in battery performance. At the same time, whether it is the packaging of glass and glass or the packaging of glass and backplane, blank space required for creepage distance needs to be reserved. The material cost is too high and the application scope of photovoltaic modules will also be reduced. Summary of the Invention

[0003] The purpose of the present invention is to provide a laser melting packaging method and structure for double-glass photovoltaic modules of homogeneous glass to address the defects in the prior art, so as to completely block the entry of external water vapor into and contact with the packaged battery channel, prevent the packaging material from reacting with water vapor to decompose harmful substances, and contact with the battery to cause battery corrosion, thereby extending the service life of the photovoltaic module, eliminating the blank space reserved for creepage distance, further reducing material costs, and expanding the application range of photovoltaic modules.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a laser melting packaging method for a double-glass photovoltaic module of homogeneous glass, wherein a battery array is placed in a groove set in the middle of the front panel glass; the packaging material fills the groove and does not cover the battery array; the rear cover glass is bonded to the front panel glass in the direction of the groove; the laminator is placed in a vacuum and heated to cross-link the packaging material to form a laminate; upper and lower rollers press the front panel glass and the rear cover glass; the femtosecond laser beam moves along the laser melting area, performs laser welding at the contact point between the front panel glass and the rear cover glass, and forms a continuous closed melting mark of homogeneous glass; the continuous closed melting mark is sealed along the edge of the groove, and the continuous closed melting mark physically isolates the battery array from the outside world.

[0005] Furthermore, when the packaging material is solid, first spread a portion of the solid packaging material in the groove; put the battery array, and then fill the battery array with the solid packaging material; the rear cover glass is bonded to the front panel glass in the direction of the groove; put it into a laminator, evacuate and heat it, so that the packaging material is cross-linked to form a laminate; upper and lower rollers press the front panel glass and the rear cover glass; the femtosecond laser moves along the laser melting area, performs welding at the contact point between the front panel glass and the rear cover glass, and forms the continuous closed melt mark; the continuous closed melt mark is sealed along the edge of the groove, and the continuous closed melt mark physically isolates the battery array from the outside world.

[0006] Furthermore, a slope is provided between the groove and the laser melting area. When the packaging material is in liquid state, the battery array is placed in the groove provided in the middle of the front panel glass. The packaging material fills the groove and the slope and does not cover the battery array.

[0007] Furthermore, when the packaging material is solid, a layer of solid packaging material is first spread in the groove, and then the battery array is placed on the packaging material, and then the packaging material slightly larger than the remaining groove slope space area is placed. After being placed in a laminator for vacuuming and heating, the solid packaging material melts and fills the groove and the slope.

[0008] Furthermore, the femtosecond laser beam moves along the laser melting area, and during the welding process of laser welding at the contact point of the front panel glass and the rear cover glass to form a continuous closed melting mark of homogeneous glass, the gap between the front panel glass and the rear cover glass is less than 5um, and the contact point of the front panel glass and the rear cover glass on the laser melting area is welded by laser for a short time and high temperature, and the welding energy is ensured to be less than 100uJ, thereby forming the continuous closed melting mark.

[0009] Furthermore, the continuous closed melt mark is a continuous closed homogeneous glass melt connection body with a thickness of less than 100 μm along the laser melting area, and the battery array and the packaging material are sealed in this continuously closed laminate of the front panel glass and the rear cover glass.

[0010] A homogeneous glass double-glass photovoltaic laser melting packaging structure includes a front panel glass and a rear cover glass, wherein a groove is provided in the middle of the front panel glass; a battery array and packaging material are arranged in the groove; a laser melting area is provided at the edge portion between the groove and the front panel glass, and the laser melting area remains transparent; after the front panel glass and the rear cover glass are laser welded, a continuous closed melting mark surrounding and closing the groove is formed in the laser melting area; the depth of the groove is equal to the thickness of the battery array plus the thickness of the packaging material during lamination.

[0011] Furthermore, a slope is provided between the groove and the laser melting area, and the slope slopes downward from the outside to the inside.

[0012] Furthermore, the light-facing glass in the groove of the front panel glass is embossed.

[0013] Furthermore, the groove is a rectangular structure as a whole.

[0014] Furthermore, the rear cover glass is provided with an opening to connect the battery array output to an external junction box. The front panel glass and the rear cover glass are welded and the battery array therein is sealed to form a laminate mounting frame and the junction box to form a photovoltaic module.

[0015] The method comprises placing a battery array in a groove provided in the middle of a front panel glass; filling the groove with a packaging material and not covering the battery array; laminating the rear cover glass to the front panel glass in the direction of the groove; placing the rear cover glass in a laminating machine, evacuating the machine and heating the machine to cross-link the packaging material and form a laminate; pressing the front panel glass and the rear cover glass with upper and lower rollers; moving a femtosecond laser beam along a laser melting area, performing laser welding at the contact point between the front panel glass and the rear cover glass, and forming a continuous closed melting mark of homogeneous glass; the continuous closed melting mark forms a seal along the edge of the groove, and the continuous closed melting mark physically isolates the battery array from the outside world. A groove is provided in the middle of the front panel glass; a battery array and packaging material are provided in the groove; a laser melting area is provided at the edge portion between the groove and the front panel glass, and the laser melting area remains transparent; after laser welding, the front panel glass and the rear cover glass form a continuous closed melting mark structure surrounding and closing the groove in the laser melting area, thereby completely blocking the passage of external water vapor into and contacting the packaged battery, preventing the packaging material from reacting with water vapor to decompose harmful substances, contacting the battery and causing battery corrosion, thereby extending the service life of the photovoltaic module, eliminating the blank space reserved for creepage distance, further reducing material costs, and expanding the application range of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of the front panel glass of a homogeneous glass double-glass photovoltaic laser melting packaging structure;

[0018] Figure 2 A top view of the front panel glass of a homogeneous glass double-glass photovoltaic laser melting packaging structure;

[0019] Figure 3 A schematic diagram of the positions of the front and rear cover glasses before melting in a homogeneous glass double-glass photovoltaic laser melting packaging structure;

[0020] Figure 4 A schematic diagram of a homogeneous glass double-glass photovoltaic laser melting packaging structure after melting is completed;

[0021] Figure 5 This is a flow chart of a laser melting encapsulation method for a double-glass photovoltaic module of homogeneous glass when the encapsulation material is in liquid state;

[0022] Figure 6 This is a flow chart of a laser melting encapsulation method for a double-glass photovoltaic module of homogeneous glass when the encapsulation material is solid;

[0023] Figure 7 This is a cross-sectional diagram of the battery array after packaging;

[0024] Reference numerals:

[0025] Front panel glass 1, rear cover glass 2, groove 3, laser melting area 4, continuous closed melting mark 4-1, slope 5. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] A laser melting encapsulation method for double-glass photovoltaic modules of homogeneous glass, such as Figure 1 、 3 As shown in Figures 5 and 6, the battery array is placed in the groove 3 set in the middle of the front panel glass 1; the packaging material fills the groove 3 and does not cover the battery array; the rear cover glass 2 is attached to the front panel glass 1 in the direction of the groove 3; the laminator is placed in a vacuum and heated to cross-link the packaging material to form a laminate; the upper and lower rollers press the front panel glass 1 and the rear cover glass 2; the femtosecond laser beam moves along the laser melting area 4, performs laser welding at the contact point between the front panel glass 1 and the rear cover glass 2, and forms a continuous closed melting mark 4-1 of homogeneous glass; the continuous closed melting mark 4-1 is sealed along the edge of the groove 3, and the continuous closed melting mark 4-1 physically isolates the battery array from the outside world.

[0029] Specifically, by using this front and back glass for fusion connection, a closed space is formed between the front and back cover glasses, which isolates water vapor from entering the polymer packaging area and contacting the photovoltaic cells. The battery cells will no longer be corroded by harmful substances formed after the packaging polymer materials absorb water, resulting in a decrease in battery efficiency. The surface layer of the battery, such as the hydrolysis of the transparent conductive oxide TCO layer of the heterojunction battery, which is sensitive to water, and the hydrolysis of polymer packaging materials, especially those with a high water absorption coefficient, such as two-component silicone, although it has very strong UV resistance, has not been widely used due to its large water absorption coefficient. After glass fusion connection, this ultra-stable silicone is used, the transmittance can be improved and the service life can be extended. Moreover, since there is a physical connection between the glasses, it can block water and the creepage distance regulations are no longer applicable. The blank space originally required to reserve the creepage distance can be reduced, further reducing material costs and improving component efficiency. That is, the laser fusion welding between the front panel glass 1 and the rear cover glass 2 forms a continuous and closed fusion mark 4-1, which completely blocks external water vapor from entering the sealing area. The battery channel reduces the risk of the encapsulation material reacting with water and releasing harmful substances, effectively protecting the cells from corrosion and thus extending the service life of the photovoltaic module. Not only does groove 3 provide a mounting location for the battery array, but the encapsulated structure of the melt mark 4-1 also enhances the overall stability and reliability of the encapsulation structure, allowing the photovoltaic module to maintain better performance output and durability when subjected to external forces or environmental changes. The vacuum and heating processes in the laminator expel the air inside, while negative pressure compresses the front and back glass panels. This prevents air from accumulating during high-temperature lamination during femtosecond laser welding, which could cause the glass to crack due to air entrapment. It also prevents air from entering the encapsulation material after melting, forming bubbles and affecting the cell power generation. This not only improves the precision and efficiency of the laser welding process, but also reduces production costs, making the manufacture of photovoltaic modules more economical and environmentally friendly. The use of homogeneous glass materials for encapsulation makes the photovoltaic module more adaptable and flexible to different environmental conditions and application scenarios. This helps expand the application range of photovoltaic modules, improve their market competitiveness, and promote the development and progress of the photovoltaic industry.

[0030] As a preferred embodiment of the above, Figure 6As shown, when the packaging material is solid, first spread a portion of the solid packaging material in the groove 3; put the battery array, and then fill the battery array with the solid packaging material; the rear cover glass 2 is attached to the front panel glass 1 in the direction of the groove 3; put it into the laminator, evacuate and heat it, so that the packaging material is cross-linked to form a laminate; the upper and lower rollers press the front panel glass 1 and the rear cover glass 2; the femtosecond laser moves along the laser melting area 4, and performs welding at the contact point between the front panel glass 1 and the rear cover glass 2 to form the continuous closed melting mark 4-1; the continuous closed melting mark 4-1 is sealed along the edge of the groove 3, and the continuous closed melting mark 4-1 physically isolates the battery array from the outside world.

[0031] Specifically, by first laying a portion of solid-state packaging material within groove 3, this step ensures that the packaging material is evenly distributed during the subsequent filling and cross-linking processes, avoiding performance degradation caused by uneven material distribution. At the same time, this also provides stable support for the placement of the battery array. The battery array is placed on the solid-state packaging material and then filled with solid-state packaging material. This design ensures the stability and safety of the battery array during the packaging process. The solid-state packaging material can effectively fix the battery, preventing it from displacement or damage in subsequent processes. Through vacuuming and heating treatment in the laminator, the solid-state packaging material is cross-linked to form a laminate. This step not only improves the cross-linking efficiency and quality of the encapsulation material but also enhances the overall strength and stability of the encapsulation structure. Using a femtosecond laser to precisely weld along the laser-melted area 4, a continuous fusion line 4-1 is formed. This ensures accurate and reliable welding while also preventing performance degradation or safety hazards caused by improper welding. The continuous fusion line 4-1, formed along the edge of the groove 3, forms a closed structure, physically isolating the cell array within the module. This not only effectively blocks the penetration path of external moisture and harmful substances, but also improves the waterproof, moisture-proof, and corrosion-resistant properties of the photovoltaic module. Through precise encapsulation material placement, cell fixation, lamination, cross-linking, and laser welding processes, the overall reliability and durability of the photovoltaic module are enhanced. This helps extend the service life of the photovoltaic module and reduce maintenance costs. The enhanced stability and strength of the encapsulation structure ensure that the photovoltaic module maintains better performance output and efficiency over long-term use. This helps improve the overall efficiency of photovoltaic power generation systems and enhance energy utilization. Through innovative design and optimized production processes, the quality and performance of photovoltaic modules are improved, enhancing their market competitiveness. This will help promote the development and progress of the photovoltaic industry and promote the popularization and application of clean energy.

[0032] As a preferred embodiment of the above, Figure 1 、 3As shown in Figure 5, a slope 5 is provided between the groove 3 and the laser melting area 4. When the packaging material is in liquid state, the battery array is placed in the groove 3 provided in the middle of the front panel glass 1. The packaging material fills the groove 3 and the slope 5 and does not cover the battery array.

[0033] Specifically, the design of the slope 5 increases the contact area between the packaging material and the front panel glass 1 and the rear cover glass 2, which not only helps the packaging material to better penetrate into the tiny gaps between the glass, but also enhances the adhesion between the packaging material and the glass, thereby improving the overall sealing performance. When the continuous sealed melt mark 4-1 is damaged, the packaging material in the slope 5 can still maintain sufficient sealing ability, so that water vapor and harmful substances need to bypass more complex paths during the penetration process, which increases the difficulty of penetration and effectively reduces the possibility of water vapor and harmful substances entering the interior of the photovoltaic module, thereby improving the moisture resistance, corrosion resistance and durability of the photovoltaic module.

[0034] As a preferred embodiment of the above, Figure 6 As shown, when the packaging material is solid, first spread a layer of solid packaging material in the groove 3, then place the battery array on the packaging material, and then place the packaging material slightly larger than the remaining space area of ​​the groove slope 5. After being placed in a laminator for vacuuming and heating, the solid packaging material melts and fills the groove 3 and the slope 5.

[0035] Specifically, by first laying out a portion of solid-state packaging material in the groove 3, then placing the battery array, and then adding packaging material slightly larger than the remaining space area of ​​the groove 3, the amount of packaging material can be precisely controlled. This step-by-step filling method helps avoid performance degradation or safety hazards caused by too much or too little packaging material. Under the action of vacuuming and heating the laminator, the solid-state packaging material will melt and fill the entire groove 3 and slope 5. This melting and filling method ensures the uniform distribution of the packaging material on the groove 3 and slope 5, avoiding performance degradation caused by uneven material distribution. After the packaging material melts, it can penetrate into the tiny gaps between the groove 3 and slope 5, forming a tight packaging structure. This tight packaging structure helps improve the sealing of the photovoltaic module, reduce the penetration of water vapor and harmful substances, and thus extend the service life of the photovoltaic module. The method of first laying out the solid-state packaging material and then melting it can simplify the packaging process and improve packaging efficiency. At the same time, the vacuuming and heating treatment of the laminator also accelerates the melting process of the packaging material, making the entire packaging process more efficient and automated.

[0036] As a preferred embodiment of the above, Figure 1 、 5As shown in FIG6 , the femtosecond laser beam moves along the laser melting area 4, and during the welding process of laser welding at the contact point of the front panel glass 1 and the rear cover glass 2 and forming a continuous closed melting mark 4-1 of homogeneous glass, the gap between the front panel glass 1 and the rear cover glass 2 is less than 5 μm, and the contact point of the front panel glass 1 and the rear cover glass 2 on the laser melting area 4 is welded by laser at a short time and high temperature, and the welding energy is ensured to be less than 100 uJ, thereby forming the continuous closed melting mark 4-1.

[0037] Specifically, the gap between the front glass panel 1 and the rear cover glass 2 is precisely controlled to less than 5μm, helping to ensure that laser energy can be efficiently transferred to the contact surface and form a continuous melt mark. In the laser melting area 4, the contact point of the front glass panel 1 and the rear cover glass 2 is rapidly heated to a molten state through laser short-time high-temperature welding technology. This is not only fast but also ensures that the temperature of the welding area quickly reaches the melting point, thus forming a continuous melt mark. During the welding process, the welding energy is precisely controlled within a range of less than 100μJ. This fast, high-energy welding method helps to reduce thermal stress generated during welding, lower the risk of glass breakage, and ensure weld quality. Through precise laser control and energy transfer, a continuous melt mark 4-1 is formed at the contact point of the front glass panel 1 and the rear cover glass 2. This melt mark not only provides good sealing performance, but also effectively physically isolates the cell array within the module, improving the overall performance of the photovoltaic module.

[0038] As a preferred embodiment of the above, Figure 1 、 5 As shown in Figure 6, the continuous closed melt mark 4-1 is a continuous closed homogeneous glass melt connection body less than 100um along the laser melting area 4, and the battery array and the packaging material are sealed in this continuously closed laminate of the front panel glass 1 and the rear cover glass 2.

[0039] Specifically, the width of the continuously sealed melt line 4-1 is controlled to be less than 100 μm, forming a continuous, closed, homogeneous glass fusion connector along the laser-melted region 4. This tiny size and continuous form ensure the compactness and stability of the melt line, which is beneficial for improving the overall performance of the photovoltaic module and ensuring the consistency of the connector material with the original glass material, thereby improving the reliability and stability of the connection. The continuously sealed melt line 4-1 forms a continuous closed structure, enclosing the battery array and packaging materials within this continuously closed laminate of the front panel glass 1 and the rear cover glass 2. This closed structure effectively isolates the external environment from the internal components, improving the moisture, dust, and corrosion resistance of the photovoltaic module. The continuous melt line 4-1, as a homogeneous connector, has high strength and good stability, and can withstand various external forces and environmental changes to which the photovoltaic module is subjected during use. This helps improve the reliability and service life of photovoltaic modules. The closed nature of the melt mark 4-1 effectively isolates the external environment from the internal components, reducing the impact of moisture, dust, and harmful substances on the photovoltaic modules. This helps maintain the stable performance of the photovoltaic modules and improves the photoelectric conversion efficiency. The continuous sealing of the melt mark 4-1, as a key packaging structure, simplifies the packaging process. Using laser welding beam technology, the packaging and connection process can be completed in a single step, without the need for additional sealing materials or process steps. This reduces production costs and improves production efficiency. The closed nature and high strength of the melt mark 4-1 ensure the safety of photovoltaic modules in harsh environments. Even under extreme conditions such as high temperature, high humidity, or strong winds, the photovoltaic modules can maintain stable performance output without safety hazards caused by packaging problems.

[0040] A homogeneous glass double-glass photovoltaic laser melting packaging structure includes a front panel glass 1 and a rear cover glass 2, wherein a groove 3 is provided in the middle of the front panel glass 1; a battery array and packaging material are arranged in the groove 3; a laser melting area 4 is provided at the edge portion between the groove 3 and the front panel glass 1, and the laser melting area 4 remains transparent; after the front panel glass 1 and the rear cover glass 2 are laser welded, a continuous closed melting mark 4-1 surrounding and closing the groove 3 is formed in the laser melting area 4; the depth of the groove 3 is equal to the thickness of the battery array plus the thickness of the packaging material during lamination.

[0041] Specifically, the front glass panel 1 serves as the front protective layer of the module, with a groove 3 disposed in the center. The groove is designed to accommodate the photovoltaic cell array and packaging materials. The rear cover glass 2 is positioned opposite the front glass panel 1, together forming the module's external packaging structure. The photovoltaic cell array is located within the groove 3 and is the core power generation portion of the module. The packaging materials are also located within the groove 3, securing and protecting the photovoltaic cell array while also providing electrical insulation and moisture resistance. A laser melting area 4 is located at the edge between the groove 3 and the front glass panel 1. This area remains transparent to allow the laser to penetrate the glass and perform welding at the contact point between the front glass panel and the rear glass panel. After laser welding the front glass panel 1 and the rear cover glass 2 within the laser melting area 4, a continuous closed melt mark 4-1 is formed that surrounds and closes the groove 3. This welding method is highly precise and efficient, ensuring weld quality while reducing thermal stress and deformation during the welding process. The front glass panel 1 and the rear cover glass 2 are made of homogeneous glass material, which helps ensure the strength and stability of the joint after welding. Welding between homogeneous materials is more likely to form a tight fusion, thereby improving the sealing and durability of the component. The laser melting area 4 remains transparent, which allows the laser to penetrate this area and directly act on the welding part of the glass contact area. This design not only simplifies the welding process, but also improves the accuracy and controllability of welding. The continuous closed melt mark 4-1 surrounds and closes the groove 3, effectively isolating the external environment from the internal area of ​​the component. This closed structure can prevent moisture, dust and harmful substances from entering the interior of the component, thereby protecting the photovoltaic cell array and packaging materials from damage; the depth of the groove 3 and the thickness of the cell array plus the thickness of the packaging material during lamination are equal, so that after lamination, the packaging material can not only cover the outer slope of the groove, but also adhere well to the rear cover glass.

[0042] As a preferred embodiment of the above, Figure 1 As shown, a slope 5 is provided between the groove 3 and the laser melting area 4 , and the slope 5 is inclined downward from the outside to the inside.

[0043] Specifically, the design of the slope 5 increases the contact area between the packaging material and the front panel glass 1 and the rear cover glass 2, which not only helps the packaging material to better penetrate into the tiny gaps between the glass, but also enhances the adhesion between the packaging material and the glass, thereby improving the overall sealing performance. When the continuous sealed melt mark 4-1 is damaged, the packaging material in the slope 5 can still maintain sufficient sealing ability, so that water vapor and harmful substances need to bypass more complex paths during the penetration process, which increases the difficulty of penetration and effectively reduces the possibility of water vapor and harmful substances entering the interior of the photovoltaic module, thereby improving the moisture resistance, corrosion resistance and durability of the photovoltaic module.

[0044] As a preferred embodiment of the above, Figure 1As shown, the light-facing glass in the groove 3 of the front panel glass 1 is embossed.

[0045] Specifically, embossing creates a bumpy texture on the glass surface, which alters the path of light, causing it to scatter and diffusely reflect. In photovoltaic modules, this scattering and diffuse reflection effect helps increase the time light stays on the panels, improving light utilization and ultimately increasing the module's power generation efficiency.

[0046] As a preferred embodiment of the above, Figure 2 As shown, the groove 3 is a rectangular structure as a whole.

[0047] Specifically, rectangular grooves can more efficiently utilize space. Given the same area, rectangular structures can accommodate more photovoltaic cells than other shapes, thereby improving the power generation efficiency and power output of photovoltaic modules and making them easier to install and secure. Furthermore, in the glass groove processing process, the glass rolling process can be used to form the grooves. For example, a dedicated mounting bracket or fixture can be used to secure the four corners of the rectangular groove, ensuring the stability and safety of the photovoltaic module during installation. The rectangular structure can also better block water.

[0048] As a preferred embodiment of the above, Figure 2 As shown, the rear cover glass 2 is provided with an opening to connect the battery array output to the external junction box. The front panel glass 1 and the rear cover glass 2 are welded and the battery array therein is sealed to form a laminate mounting frame and the junction box to form a photovoltaic module.

[0049] Specifically, by using laser-melted encapsulated laminates to form photovoltaic modules, the service life of the photovoltaic modules is further extended, material costs are reduced, the long-term reliability of the photovoltaic modules is improved, battery efficiency is ensured, and the application range of the photovoltaic modules is expanded.

[0050] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser melting packaging method for a double-glass photovoltaic module of homogeneous glass, characterized in that: Place the battery array into a groove (3) provided in the middle of the front panel glass (1); The packaging material fills the groove (3) and does not cover the battery array; The rear cover glass (2) is bonded to the front panel glass (1) in the direction of the groove (3); placing the packaging material in a laminator, evacuating the material and heating the laminator to allow the packaging material to be cross-linked to form a laminate; The upper and lower rollers press the front panel glass (1) and the rear cover glass (2) tightly; The femtosecond laser beam moves along the laser melting area (4), performs laser welding at the contact point between the front panel glass (1) and the rear cover glass (2), and forms a continuous closed melting mark (4-1) of homogeneous glass; The continuous closed melting mark (4-1) forms a seal along the edge of the groove (3), and the continuous closed melting mark (4-1) physically isolates the battery array from the outside.

2. The laser melting packaging method for double-glass photovoltaic modules of homogeneous glass according to claim 1 is characterized in that: When the packaging material is in a solid state, firstly, a portion of the solid packaging material is laid flat in the groove (3); Place the battery array, and then fill the battery array with solid packaging material; The rear cover glass (2) is bonded to the front panel glass (1) in the direction of the groove (3); placing the packaging material in a laminator, evacuating the material and heating the laminator to allow the packaging material to be cross-linked to form a laminate; The upper and lower rollers press the front panel glass (1) and the rear cover glass (2) tightly; The femtosecond laser moves along the laser melting area (4), performs welding at the contact point between the front panel glass (1) and the rear cover glass (2), and forms the continuous closed melting mark (4-1); The continuous closed melting mark (4-1) forms a seal along the edge of the groove (3), and the continuous closed melting mark (4-1) physically isolates the battery array from the outside.

3. The laser melting packaging method for double-glass photovoltaic modules of homogeneous glass according to claim 1 is characterized in that: A slope (5) is provided between the groove (3) and the laser melting area (4); when the packaging material is in liquid state, the battery array is placed in the groove (3) provided in the middle of the front panel glass (1); the packaging material fills the groove (3) and the slope (5) and does not cover the battery array.

4. The laser melting packaging method for double-glass photovoltaic modules of homogeneous glass according to claim 2 is characterized in that: When the packaging material is solid, a layer of the solid packaging material is first spread in the groove (3), and then the battery array is placed on the packaging material. Then, a packaging material slightly larger than the remaining space of the groove slope (5) is placed. After being placed in a laminator for evacuation and heating, the solid packaging material melts and fills the groove (3) and the slope (5).

5. The laser melting packaging method for double-glass photovoltaic modules of homogeneous glass according to claim 1 is characterized in that: A femtosecond laser beam moves along a laser melting region (4), and during the welding process of performing laser welding at the contact point between the front panel glass (1) and the rear cover glass (2) to form a continuous closed melting mark (4-1) of homogeneous glass, a gap between the front panel glass (1) and the rear cover glass (2) is less than 5 μm, and laser short-time high-temperature welding is performed at the contact point between the front panel glass (1) and the rear cover glass (2) on the laser melting region (4), and the welding energy is ensured to be less than 100 uJ, thereby forming the continuous closed melting mark (4-1).

6. The laser melting packaging method for double-glass photovoltaic modules of homogeneous glass according to claim 5, characterized in that: The continuous closed melt mark (4-1) is a continuous closed homogeneous glass melt connection body less than 100 um along the laser melting area (4), and the battery array and the packaging material are sealed in this continuously closed laminate of the front panel glass (1) and the rear cover glass (2).

7. A homogeneous glass double-glass photovoltaic laser melting packaging structure, characterized in that: It comprises a front panel glass (1) and a rear cover glass (2), wherein a groove (3) is arranged in the middle of the front panel glass (1); A battery array and packaging materials are arranged in the groove (3); A laser melting area (4) is provided at the edge portion between the groove (3) and the front panel glass (1), and the laser melting area (4) remains transparent; After laser welding, the front panel glass (1) and the rear cover glass (2) form a continuous closed melting mark (4-1) in the laser melting area (4) that surrounds and closes the groove (3); The depth of the groove (3) is equal to the thickness of the battery array plus the thickness of the packaging material during lamination.

8. The homogeneous glass double-glass photovoltaic laser melting packaging structure according to claim 1, characterized in that: A slope (5) is provided between the groove (3) and the laser melting area (4), and the slope (5) slopes downward from the outside to the inside; the groove (3) is a rectangular structure as a whole.

9. The homogeneous glass double-glass photovoltaic laser melting packaging structure according to claim 1, characterized in that: The light-facing glass in the groove (3) of the front panel glass (1) is embossed.

10. The homogeneous glass double-glass photovoltaic laser melting packaging structure according to claim 1, characterized in that: The rear cover glass (2) is provided with an opening to connect the battery array output to an external junction box. The front panel glass (1) and the rear cover glass (2) are welded and the battery array inside is sealed to form a laminate installation frame and the junction box to form a photovoltaic module.

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