Method for realizing vacuum glass packaging by laser welding

Abstract

The invention provides a method for realizing vacuum glass packaging by laser welding, which comprises the following steps of: processing and forming a glue groove for accommodating glue on a first glass substrate with a groove in the middle, arranging the glue groove between the periphery of the edge of the first glass substrate and the groove, and forming the shape of the glue groove into a concave groove or a notch; glue is applied into the glue groove, after a supporting column and a getter are arranged in the groove, the two pieces of glass are combined in a vacuum environment, the glue is preliminarily cured, pre-packaging is completed, and a pre-packaging assembly is obtained; and the pre-packaging assembly is transferred to the atmospheric environment, laser beams are adopted for welding along the laser welding area of the pre-packaging assembly, one or more laser welding beads are formed, and final packaging is completed. According to the application, through an innovative process of combining pre-packaging in a vacuum environment and laser welding packaging in an atmospheric environment, the requirements of high vacuum degree acquisition and efficient production are effectively considered.

Description

Technical Field

[0001] This invention belongs to the technical field of vacuum glass, and specifically relates to a method for vacuum glass encapsulation using laser welding. Background Technology

[0002] Vacuum glass is the next generation of high-efficiency energy-saving glass products following insulated glass. It achieves an ultra-low heat transfer coefficient by completely eliminating gas convection and conduction through a vacuum layer between two glass layers. The performance and lifespan of this product are highly dependent on the quality of the hermetically sealed edges. Existing vacuum glass sealing technologies commonly employ a hybrid method: "first using a biodegradable temporary organic adhesive for positioning and fixation, then sealing with high-temperature glass powder to achieve a permanent hermetically sealed bond." This method solves the operational problem of glass easily slipping and misaligning before entering the high-temperature furnace, leading to support movement or glass breakage. While this hybrid process of "first using temporary adhesive for positioning, then high-temperature sealing" is currently the mainstream method in vacuum glass manufacturing, it also introduces some inherent shortcomings: it still relies on high-temperature processes, thus failing to avoid thermal damage to the glass substrate; it introduces the risk of organic adhesive contamination, placing extremely high demands on the precision of process control; and it does not fundamentally improve production efficiency and energy consumption.

[0003] Laser welding technology, with its advantages of high energy density, narrow heat-affected zone, fast processing speed, and high degree of automation, has been widely used in the fields of metal and plastic packaging, and is theoretically very suitable for solving the problems of thermal damage and efficiency in vacuum glass packaging. However, due to the high transmittance of ordinary glass to near-infrared lasers, low self-absorption rate, and the inherent brittleness and sensitivity to thermal stress of the material, direct application of traditional laser welding is prone to cracking or insufficient melting, making it difficult to form a dense and reliable sealing weld. Therefore, developing a new laser welding method suitable for glass materials and capable of achieving high-strength hermetic sealing has become a key technological challenge for promoting the upgrading of the vacuum glass industry. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, this application provides a method for vacuum glass encapsulation using laser welding to solve the above-mentioned technical defects.

[0005] According to a first aspect of the present invention, a method for achieving vacuum glass encapsulation using laser welding is provided, comprising the following steps:

[0006] S1: A glue groove for containing the glue is formed on a first glass substrate with a groove in the middle. The glue groove is located between the edge of the first glass substrate and the groove. The shape of the glue groove is a concave groove or a notch.

[0007] S2: Apply colloid into the colloid tank, and after setting support pillars and getter in the groove, assemble the two glass substrates in a vacuum environment, and pre-cure the colloid to complete the pre-encapsulation and obtain the pre-encapsulated component.

[0008] S3: Transfer the pre-packaged component to an atmospheric environment and use a laser beam to weld along the laser welding area of ​​the pre-packaged component to form one or more laser weld lines to complete the final packaging. The laser welding area is located around the edge of the glass substrate.

[0009] By combining "pre-packaging in a vacuum environment" with "laser welding packaging in an atmospheric environment," the innovative process effectively balances the needs of achieving high vacuum levels and efficient production. Pre-packaging ensures the initial quality of the vacuum chamber and temporarily fixes the two glass substrates, while subsequent laser welding forms an inorganic seal with excellent airtightness, high strength, and aging resistance. Together with the colloid, it constitutes a double sealing barrier of "colloid sealing-welding" from the inside out, greatly improving the long-term reliability and lifespan of the product.

[0010] In specific embodiments, the glue tank can be a single glue tank or multiple glue tanks arranged in parallel at intervals. In this structural configuration, the single glue tank achieves the core function with the simplest sealing unit, which has the advantages of simple manufacturing process and low cost; while the multi-gluoride tank significantly enhances sealing reliability, long-term stability and process fault tolerance through functional division, redundant design and stress control, providing a performance scalable solution for high-end applications.

[0011] In a specific embodiment, at least one pressure relief channel is provided between multiple adhesive grooves. In this structural configuration, the pressure relief channel provides a dedicated exhaust path for trace amounts of volatile substances that may be generated when the adhesive is heated during the laser welding process, guiding the gas to escape laterally. This completely avoids the formation of bubbles or holes due to gas being trapped in the sealed area, ensuring the tightness and integrity of the laser weld bead.

[0012] In a specific embodiment, in step S1, the pressure relief channel and the glue tank are processed simultaneously, and the minimum distance between the pressure relief channel and the outermost glue tank is greater than 0.5 mm; the minimum distance between the pressure relief channel and the laser weld bead is greater than 0.3 mm. In this process design, by processing the pressure relief channel and the glue tank simultaneously, process integration and cost optimization are achieved. At the same time, by strictly limiting the minimum distance between the pressure relief channel and the outermost glue tank and the laser weld bead, efficient and controllable gas discharge during welding is achieved while ensuring the integrity of the glue tank's sealing function and the quality of the weld bead formation. This also effectively isolates the laser heat effect and avoids the risk of microcracks caused by thermal shock or structural weakening.

[0013] In specific embodiments, the number of laser weld beads formed in the laser welding zone ranges from 1 to 50. By designing a process with a high number of weld beads, a redundant sealing network is constructed. In the event that individual weld beads fail due to microscopic defects or long-term aging, the overall airtightness of the vacuum glass is ensured by the remaining weld beads, significantly reducing the probability of vacuum failure.

[0014] In specific embodiments, the grooves and / or adhesive channels are processed on the second glass substrate, or simultaneously on the first and second glass substrates. This structural design can address a variety of different application scenarios and allows engineers to optimize the design based on product performance, cost budget, process capabilities, and specific application requirements.

[0015] In a specific embodiment, the laser welding in step S3 is solder encapsulation. Before step S2, step S1a is included: printing or coating glass solder on the sealing area of ​​the first glass substrate and / or the second glass substrate, and baking and sintering the glass solder; the laser beam in step S3 acts on the glass solder. In this process design, the main function of step S1a is to pre-print and sinter the solder, providing a foundation for subsequent laser welding. The sintered glass powder becomes a porous layer, which is more easily melted under the action of the laser to form a seal, which can improve the reliability and efficiency of laser sealing. At the same time, the solder encapsulation process can significantly improve the reliability and strength of the encapsulation and reduce the risk of thermal damage to the glass substrate.

[0016] In a specific embodiment, the laser welding in step S3 is a solderless encapsulation, where the laser beam acts directly on the contact interface between the first and second glass substrates. This process design creates a sealed interface in the laser-welded area that is completely identical in composition to the substrate, eliminating the risk of thermal expansion mismatch, ion deposition, or interface aging that may result from added solder. This achieves superior airtightness, extreme long-term reliability, and excellent biocompatibility.

[0017] This application also provides a vacuum glass encapsulated using laser welding, which is prepared by the above-described method for encapsulating vacuum glass using laser welding.

[0018] In a specific embodiment, a vacuum glass encapsulated using laser welding includes: a first glass substrate and a second glass substrate, which are sealed together by a peripheral sealing structure to form at least one vacuum cavity; the peripheral sealing structure includes a pre-sealing layer formed by a cured colloid and a final sealing layer formed by laser welding; the final sealing layer is located at the laser weld bead formed in an atmospheric environment. In this structural configuration, the pre-sealing layer mainly undertakes the function of initial vacuum cavity formation and temporary component fixation, ensuring that the cavity is in a high vacuum state before laser welding; while the final sealing layer is responsible for providing a high-strength, aging-resistant, and completely airtight inorganic sealing body, fundamentally solving the problem of long-term aging and gas leakage of organic colloids. The two work together to form a functional division of "temporary fixation + permanent sealing", which combines reliable vacuum acquisition and long-term encapsulation.

[0019] Compared with the prior art, the beneficial results of the present invention are as follows:

[0020] 1. High-energy-density lasers are used for localized selective heating, with precise and controllable heat input and a very small heat-affected zone, which can effectively avoid thermal damage to the glass substrate caused by high-temperature sealing.

[0021] 2. The "adhesive bonding followed by laser welding" encapsulation method can effectively avoid the problems of glass cracking or insufficient melting caused by traditional laser welding, which makes it difficult to form a dense and reliable sealing weld.

[0022] 3. It can be selected to process single-stage or multi-stage glue tanks, which can proactively respond to different real-world application scenarios. Attached Figure Description

[0023] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0024] Figure 1 This is a process flow diagram of vacuum glass encapsulation using laser welding according to the first embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of a vacuum glass encapsulation structure with a notch-shaped glue tank according to the first embodiment of the present invention;

[0026] Figure 3 This is a top view of a first glass substrate with a notch-shaped adhesive groove according to a first embodiment of the present invention;

[0027] Figure 4This is a schematic diagram of a vacuum glass encapsulation structure in which the adhesive groove is a concave groove shape according to the first embodiment of the present invention;

[0028] Figure 5 This is a top view of a first glass substrate with a concave groove shape according to the first embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of a vacuum glass package according to a second embodiment of the present invention;

[0030] Figure 7 This is a top view of the first glass substrate according to a second embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of a vacuum glass according to the first embodiment of the present invention.

[0032] The meanings of the numbers in the figure are as follows: 01-First glass substrate, 02-Second glass substrate, 03-Groove, 04-Glue groove, 05-Laser welding area, 06-Support column, 07-Getting agent, 08-Exhaust hole. Detailed Implementation

[0033] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and are illustrated by specific illustrative embodiments in which the invention may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the invention. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the invention is defined by the appended claims.

[0034] This invention proposes a method for achieving vacuum glass encapsulation using laser welding. Figure 1 A process flow diagram illustrating vacuum glass encapsulation using laser welding according to the first embodiment of the present invention is shown. Figure 1 As shown, a method for achieving vacuum glass encapsulation using laser welding includes:

[0035] S1: A glue groove for containing the glue is formed on a first glass substrate with a groove in the middle. The glue groove is located between the edge of the first glass substrate and the groove. The shape of the glue groove is a concave groove or a notch.

[0036] S2: Apply colloid into the glue tank, and after setting support pillars and getter in the groove, laminate the first glass substrate and the second glass substrate in a vacuum environment, and pre-cure the colloid to complete the pre-encapsulation and obtain the pre-encapsulated component.

[0037] S3: The pre-packaged component is transferred to an atmospheric environment, and a laser beam is used to weld along the laser welding area of ​​the pre-packaged component to form one or more laser weld lines to complete the final packaging. The laser welding area is located around the edge of the glass substrate.

[0038] In this process design, step S1, forming the groove is to precisely control the thickness and shape of the vacuum chamber, as well as to accommodate the support column and getter. Forming the adhesive groove is to precisely control the spread and position of the adhesive, preventing it from overflowing and contaminating the internal vacuum chamber or external laser welding area under pressure. The consistent depth of the adhesive groove ensures uniform adhesive layer thickness, which is beneficial for the initial sealing effect of the vacuum glass. In step S2, bonding the sheets in a vacuum environment ensures the adhesive is free of air bubbles, preventing large air bubbles from forming holes and leakage channels after curing. It also ensures that subsequent laser welding is performed under atmospheric pressure, contributing to a higher quality weld. Preliminary curing in a vacuum environment creates a temporary high-strength seal between the two glass sheets, preventing misalignment or even breakage due to the negative pressure of the internal vacuum when transferred to an atmospheric environment. It also gives the glass sufficient strength to be safely removed from the vacuum chamber for handling and positioning. In step S3, laser welding in an atmospheric environment can improve the airtightness, long-term stability, and anti-aging properties of the glass (resistance to ultraviolet rays, high temperature and high humidity), and can maintain the vacuum degree of the glass for a long time.

[0039] This process design combines "pre-packaging in a vacuum environment" with "laser welding packaging in an atmospheric environment," which is beneficial for achieving high vacuum levels and efficient production of glass. Pre-packaging with a colloid seal ensures the initial quality of the vacuum chamber and temporarily fixes the two glass substrates. Subsequent laser welding creates an inorganic seal weld with excellent airtightness, high strength, and aging resistance. Together with the colloid, this forms a double-sealing barrier of "colloid sealing-welding," greatly improving the long-term reliability and lifespan of vacuum glass products.

[0040] In a specific embodiment, in step S1, a groove is formed in the center of the glass using chemical etching. The groove depth is 0.1-1 mm, and the groove width is 1 mm-10 mm. Specific operations include: cleaning the glass substrate, applying photoresist, drying, exposure and development, drying again, chemical etching, and photoresist removal and cleaning. Chemical etching in this step refers to immersing the glass in hydrofluoric acid (HF) or a hydrofluoric acid (HF)-based buffer etching solution, or using a spray etching solution to allow the glass to chemically react with the etching solution. During the reaction, the exposed glass areas react chemically with the etching solution and are uniformly corroded and dissolved, while the areas coated with photoresist remain intact. During chemical etching, the etching time, temperature, and etching solution concentration should be controlled to precisely control the depth and shape of the groove. The groove depth is determined by the etching solution concentration, temperature, and etching time, and its calculation formula is: Etching depth ≈ Etching rate × Time.

[0041] In a specific embodiment, in step S1, a groove for adhesive is formed around the edges of the glass using an edge-carving method. The width of the groove is set to 0.5-2mm, and the depth is set to 0.1-0.5mm. CNC engraving machines, laser engraving machines, or diamond grinding wheels are generally used for machining the glass. During the edge-carving process, the feed speed, rotation speed, and coolant supply must be controlled to prevent the glass from cracking or developing micro-cracks.

[0042] In specific embodiments, the groove is generally machined first, followed by the adhesive groove. This is because groove machining is a holistic, large-area process that causes changes in the internal stress distribution of the glass. If the precision adhesive groove is machined first, followed by large-area etching, the stress released during etching may cause micro-cracks or even breakage in the adhesive groove area. Conversely, adhesive groove machining is a localized, high-stress process; mechanical edge carving applies concentrated mechanical or thermal stress to the glass edge. If the groove is machined first, the fragile groove structure is very easily damaged under the high-stress impact of the edge carving.

[0043] In specific embodiments, besides the case where both the groove and the adhesive groove are processed on the first glass substrate, the groove and / or adhesive groove can also be processed on the second glass substrate, or simultaneously on both the first and second glass substrates. That is, the groove and adhesive groove can be processed on one of the first and second glass substrates, the groove can be processed on one glass substrate and the adhesive groove on the other, or both glass substrates can be processed with grooves and adhesive grooves. The various processing designs for grooves and adhesive grooves can address a wide range of application scenarios. This design diversity allows engineers to optimize the design based on product performance, cost budget, process capabilities, and the specific requirements of the application scenario. Among them, the processing technology of processing grooves and adhesive grooves on only one glass substrate has the effect of simplifying the process and reducing costs, and has a wide range of applications; the processing technology of processing grooves on one glass substrate and adhesive grooves on another glass substrate can form a composite sealing structure, which is suitable for special applications with extremely demanding requirements for airtightness and lifespan (such as aerospace and military); the processing technology of processing grooves and adhesive grooves on both glass substrates can optimize mechanical properties and increase cavity depth, which is suitable for large-size, ultra-thin, high-performance vacuum glass and projects that pursue ultimate thermal insulation performance.

[0044] In a specific embodiment, in step S2, the applicable adhesives include UV-curable adhesives and thermosetting epoxy adhesives. UV-curable adhesives are characterized by fast curing, solvent-free properties, and high bonding strength, making them suitable for automated production lines with high production efficiency requirements. They are commonly used in designs where the adhesive tank is located outside the laser weld bead, serving primarily as temporary fixation and atmospheric sealing, with the final seal achieved by laser welding. Thermosetting epoxy adhesives are characterized by high bonding strength and good durability, making them suitable for applications requiring extremely high pre-encapsulation strength, or where subsequent laser welding processes may generate significant thermal stress, and where the equipment has heating capabilities. Thermosetting epoxy adhesives can also be used in special design areas that cannot be reached by UV light (such as very wide sealing edges).

[0045] In a specific embodiment, in step S2, the support columns are precisely placed in the predetermined matrix positions within the grooves of the first glass piece by means of screen printing or array placement. The support columns are typically miniature cylinders or square columns with a diameter and height between 0.1-0.5 mm, and are made of stainless steel, ceramic, or special glass. The support columns are usually arranged in a square or equilateral triangular matrix with a spacing of 20-30 mm. The specific spacing needs to be determined by finite element analysis to ensure that the deformation of the glass under atmospheric pressure is less than the maximum allowable value of deformation.

[0046] In a specific embodiment, in step S2, a robotic arm places a sheet-like getter into a pre-reserved small recess or specific area (usually near the vent or corner) on the first glass substrate. The getter is made into sheet, strip, or powder form, and its main component is an active metal (such as zirconium, barium, titanium, etc.). The getter is activated by high-frequency induction heating into the vent. Additionally, during the fabrication of the first glass substrate in step S1, a small ring of low-melting-point glass powder is pre-sintered at the end of the vent, or a miniature glass bead is placed directly. After vacuuming and getter activation, this pre-placed glass powder or glass bead is directly heated with a laser, causing it to melt at a lower temperature, level out, and seal the entire vent channel.

[0047] In a specific embodiment, the specific operation of laminating the sheets in step S2 is as follows: In a vacuum environment, the first glass substrate with the support pillars, adsorbent, and colloid coated is aligned with the second glass substrate using a precision vision system. They are then gradually bonded together using a slightly tilted method with one end in contact first. After removing air, uniform pressure is applied. If UV adhesive is used, it is initially cured by irradiating with UV light through the observation window. If thermosetting adhesive is used, the heating system needs to be started, or after maintaining the vacuum for a certain period of time, it is removed from the cavity for complete curing, ultimately forming a stable pre-packaged component, which is then removed under normal pressure.

[0048] In a specific embodiment, in step S3, laser welding is a laser seal with added glass powder solder. Before step S2, step S1a is included: applying low-melting-point glass powder solder to the sealing area of ​​the first and / or second glass substrates, followed by baking and sintering to form a porous glass powder preform layer. A laser beam scans along a predetermined path, using a near-infrared semiconductor laser with a wavelength of 808nm or 940nm, a laser power of 60-120W, a scanning speed of 20-100mm / s, and a spot size of 0.8-1.5mm. The glass powder preform layer selectively absorbs laser energy, rapidly heating to above the melting temperature (typically 400-500℃), forming a continuous, dense, and smooth glass glaze. The molten glass powder chemically bonds to the upper and lower glass substrates, forming a permanent seal with extremely high strength and excellent airtightness. During this process, precise control of energy input is required to ensure sufficient melting of the glass powder while preventing overheating and deformation or stress cracking of the glass.

[0049] In a specific embodiment, step S3 can also involve solderless laser sealing, where the laser beam directly acts on the contact interface between the first and second glass substrates. An ultrafast pulsed laser, such as a ytterbium-doped fiber femtosecond laser with a wavelength of 1030 nm or 515 nm, is used. The laser power is set to 3-8 W, the scanning speed to 100-500 mm / s, the number of scans to 20-50, and the spot size to 10 μm. The laser is activated, inducing a nonlinear absorption effect at the glass contact interface, causing the glass material in a very small area of ​​the interface to instantly reach a molten state. The laser focus scans along the encapsulation path at a predetermined speed and overlap rate. During the scanning process, the molten glass material cools and then solidifies, directly fusing the body materials of the two glass substrates together to form a homogeneous glass weld bead with the same composition as the substrate and no foreign material. Generally, vacuum glass encapsulation uses laser sealing with added glass powder solder; solderless laser sealing is only used in a few scenarios where the long-term reliability requirements of vacuum glass are extremely high or in cutting-edge research.

[0050] In specific embodiments, the number of laser weld beads formed in the laser welding zone ranges from 1 to 50. By designing a process with a large number of weld beads, a redundant sealing network is constructed. In the event that individual weld beads fail due to microscopic defects or long-term aging, the overall airtightness of the vacuum glass is ensured by the remaining weld beads, significantly reducing the probability of vacuum failure. In high-end applications, the number of laser weld beads can be more than 50.

[0051] In specific embodiments, the positional design of the glue tank and the laser weld bead also includes several cases:

[0052] Figure 2 and Figure 4 The following are schematic diagrams of the vacuum glass encapsulation structures according to the first embodiment of the present invention, where the glue tank is in the shape of a notch and the glue tank is in the shape of a concave groove. Figure 3 and Figure 5 Top views of a first glass substrate with a notched adhesive groove and a concave groove, respectively, are shown in the first embodiment of the present invention. Figures 2 to 5 As shown, the glue groove 04 is a single-channel glue groove, and the distance between the glue groove 04 and the groove 03 is 0.5mm to 5mm. In this structural setting, the single-channel glue groove achieves the core function with the simplest sealing unit, which has the advantages of simple manufacturing process and low cost. It is suitable for conventional applications that are cost-sensitive and have reliable sealing requirements (such as ordinary building doors and windows, and household appliance glass). The basic airtightness and strength requirements can be met by optimizing the glue performance and the weld position.

[0053] Figure 6 This is a schematic diagram of the vacuum glass encapsulation structure according to the second embodiment of the present invention. Figure 7 This is a top view of the first glass substrate according to the second embodiment of the present invention, as shown below. Figure 6 and Figure 7 As shown, the adhesive groove 04 consists of multiple adhesive grooves arranged side-by-side at intervals. The grooves are notched or concave in shape, with a spacing of 1mm to 10mm between adjacent grooves. A pressure relief channel is provided between the multiple adhesive grooves. In this structural arrangement, the multiple adhesive grooves can be filled with adhesives of different properties, allowing for functional decomposition (e.g., the inner adhesive focuses on low outgassing and high barrier properties to protect the vacuum chamber; the outer adhesive focuses on high bonding strength and weather resistance to resist environmental erosion), forming a synergistic protection system. Simultaneously, the multiple adhesive grooves also provide redundant sealing, constructing multiple parallel sealing barriers and significantly reducing the risk of overall sealing performance degradation due to single-point failure. Furthermore, the pressure relief channel between the multiple adhesive grooves provides a dedicated exhaust path for trace amounts of volatile substances that may be generated by the heating of the adhesive during laser welding, guiding the gas to escape laterally. This completely prevents gas from being trapped in the sealing area, forming bubbles or voids, ensuring the density and integrity of the laser weld bead. Single-channel glue trays do not require pressure relief channels because they are usually located near the edge of the glass, and their outer side is usually directly open to the atmosphere, or there is only a narrow, non-sealed gap between them and the atmosphere, so there is no need for pressure relief.

[0054] In a specific embodiment, in step S1, the pressure relief channel and the glue tank are processed simultaneously, and the minimum distance between the pressure relief channel and the outermost glue tank is greater than 0.5mm, while the minimum distance between the pressure relief channel and the laser weld bead is greater than 0.3mm. By processing the pressure relief channel and the glue tank simultaneously, the costs of secondary positioning and separate processing are avoided, significantly improving production efficiency and ensuring positional accuracy. The structural setting of a minimum distance of greater than 0.5mm between the pressure relief channel and the outermost glue tank ensures that the outer glue tank retains sufficient glue capacity to maintain its sealing function, while providing a safety margin for processing tolerances, avoiding insufficient mechanical strength of the glass partition between the channel and the glue tank due to excessively small spacing; the structural setting of a minimum distance of greater than 0.3mm between the pressure relief channel and the laser weld bead helps to effectively isolate the welding heat-affected zone, preventing laser energy from being directly conducted to the glue tank area through the pressure relief channel wall, causing the glue to overheat and decompose; at the same time, this distance provides sufficient space for the solder to melt and fill, preventing the solder from flowing into the pressure relief channel and causing blockage.

[0055] Figure 8 A schematic diagram of the structure of the vacuum glass according to the first embodiment of the present invention is shown. Figure 8As shown, a vacuum glass encapsulated using laser welding includes: a first glass substrate 01, a second glass substrate 02, a groove 03, a glue tank 04, a laser welding area 05, a support column 06, a getter 07, and an exhaust port 08. The first glass substrate 01 and the second glass substrate 02 are sealed together by a peripheral sealing structure to form at least one vacuum cavity. The peripheral sealing structure includes a pre-sealing layer formed by cured adhesive and a final sealing layer formed by laser welding. The pre-sealing layer is located in the glue tank 04, where the adhesive has cured. The final sealing layer is located in the laser weld bead formed by laser welding in the laser welding area 05. The support column 06 and the getter 07 are both disposed within the groove 03, and the first glass substrate 01 is also provided with an exhaust port 08 matching the getter 07. In this structural design, the pre-sealing layer primarily serves to form the initial vacuum chamber and temporarily fix the components, ensuring that the chamber is in a high vacuum state before laser welding and maintaining this high vacuum state, preparing for subsequent laser sealing in an atmospheric environment. The final sealing layer, on the other hand, provides a high-strength, aging-resistant, and completely airtight inorganic seal, fundamentally solving the problem of potential aging and leakage of organic colloids over time. Together, they form a functional division of "temporary fixation + permanent sealing," combining reliable vacuum acquisition with long-term encapsulation effectiveness. Furthermore, the support column 06 ensures a constant distance between the first glass substrate 01 and the second glass substrate 02, maintaining the thickness of the vacuum layer and ensuring stable thermal insulation and mechanical properties of the product. The combination of the getter 07 and the vent 08 maintains and enhances the vacuum level within the vacuum chamber, extending the lifespan of the vacuum glass.

[0056] It is evident that those skilled in the art can make various modifications and alterations to the embodiments of the present invention without departing from the spirit and scope of the invention. In this way, the invention is also intended to cover such modifications and alterations if they fall within the scope of the claims and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.

Claims

1. A method for vacuum glass packaging using laser welding, characterized by, The method comprises the following steps: S1: forming a glue groove for accommodating glue on a first glass substrate with a groove in the middle, the glue groove being arranged between the edge of the first glass substrate and the groove, the glue groove being in the shape of a concave groove or a notch; S2: applying glue in the glue groove, arranging a support column and a getter in the groove, and then combining the first glass substrate with a second glass substrate under a vacuum environment, and preliminarily curing the glue to complete pre-packaging and obtain a pre-packaged assembly; S3: transferring the pre-packaged assembly to an atmospheric environment, and welding at least one laser welding bead along a laser welding area of the pre-packaged assembly by using a laser beam to complete final packaging, the laser welding area being located around the edge of the glass substrate.

2. The method for vacuum glass packaging by laser welding according to claim 1, wherein, The glue groove is a single glue groove or a plurality of glue grooves arranged in parallel at intervals.

3. The method of claim 2, wherein the laser welding is performed by using a laser beam having a wavelength of 1.06 μm or 10.6 μm. At least one pressure relief channel is arranged between the plurality of glue grooves.

4. The method of claim 3, wherein the laser welding is performed by using a laser beam having a wavelength of 1,064 nm. In step S1, the pressure relief channel is formed synchronously with the glue groove, and the minimum distance between the pressure relief channel and the outermost glue groove is greater than 0.5 mm, and the minimum distance between the pressure relief channel and the laser welding bead is greater than 0.3 mm.

5. The method of claim 1-4, wherein, The number of laser welding beads formed by the laser welding area is 1-50.

6. The method of claim 1, wherein the laser welding is performed by using a laser beam having a wavelength of 1,064 nm. The groove and / or the glue groove are formed on the second glass substrate, or are formed on the first glass substrate and the second glass substrate at the same time.

7. The method of claim 1, wherein the laser welding is performed by using a laser beam having a wavelength of 1.06 μm or 10.6 μm. In step S3, the laser welding is solder-free packaging, and before step S2, the method further comprises the following steps: S1a: printing or coating glass solder on the sealing area of the first glass substrate and / or the second glass substrate, and baking and sintering the glass solder; in step S3, the laser beam acts on the glass solder.

8. The method of claim 1, wherein the laser welding is performed in a vacuum. In step S3, the laser welding is solder-free packaging, and the laser beam directly acts on the contact interface of the first glass substrate and the second glass substrate.

9. A vacuum glass using laser welding for encapsulation, characterized by, Prepared by the method of any one of claims 1 to 8.

10. The vacuum glass sealed by laser welding according to claim 9, wherein, Comprise: a first glass substrate and a second glass substrate, which are sealed and combined by a peripheral sealing structure to form at least one vacuum cavity; the peripheral sealing structure comprises a pre-sealing layer formed by cured glue and a final sealing layer formed by laser welding; and the final sealing layer is a laser welding bead formed by welding in an atmospheric environment.

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