Vapor chamber with capillary structure and preparation method thereof

Abstract

The invention discloses a vapor chamber with a capillary structure, the vapor chamber comprises a first cover plate and a second cover plate, the capillary structure is packaged between the first cover plate and the second cover plate, the capillary structure comprises a metal net, the metal net is cut to form a groove, and a braided wire is arranged in the groove; a net surface supporting frame is arranged on the metal net, and the net surface supporting frame is used for fixing the braided wires; a fluid circulation structure is formed by the net face supporting frame, the groove and the braided wires arranged in the groove. The grooves are formed in the metal net in a cutting mode, the braided wires are arranged in the grooves to form a fluid circulation structure with the net face supporting frame, and the problem that water return is difficult in the manufacturing process of the ultra-thin vapor chamber can be effectively solved.

Description

Technical Field

[0001] The present application belongs to the technical field of heat dissipation devices, and specifically relates to a heat spreader with a capillary structure and a preparation method thereof. Background Art

[0002] With the rapid advancement of microelectronics technology, the miniaturization and integration of electronic devices are becoming increasingly deeper, which not only increases the heat generation per unit volume, but also puts higher requirements on heat dissipation technology. In order to ensure that electronic components operate in an efficient and stable state and prevent problems caused by overheating, efficient heat dissipation solutions must be adopted. As an advanced heat dissipation device, the vapor chamber (VC) achieves effective heat conduction through the phase change cycle of the internal working fluid. Its feature of not requiring an external power source makes it more energy-saving, environmentally friendly and superior in performance compared to traditional heat dissipation methods.

[0003] However, in the pursuit of thinner and smaller vapor chambers, the challenges brought by ultra-thinness gradually emerged. Especially for stainless steel vapor chambers VC, when the thickness is reduced to a certain extent, the traditional structural design will lead to a decrease in water return efficiency, affecting the actual heat dissipation performance of the product, and thus causing problems such as unqualified performance tests, unstable product quality, and reduced yield rate. Summary of the invention

[0004] The main purpose of the present application is to provide a heat spreader with a capillary structure and a preparation method thereof, aiming to solve the water return difficulty caused by the capillary problem caused by the thickness reduction during the manufacturing process of the existing heat spreader.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] A heat spreader with a capillary structure, the heat spreader comprising: a first cover plate and a second cover plate, wherein a capillary structure is encapsulated between the first cover plate and the second cover plate, wherein the capillary structure comprises a metal mesh, the metal mesh is cut to form a groove, a braided wire is arranged in the groove; a mesh support frame is arranged on the metal mesh, the mesh support frame is used to fix the braided wire; the mesh support frame, the groove and the braided wire constitute a fluid circulation structure.

[0007] Optionally, the cross-section of the groove along its depth direction is rectangular.

[0008] Optionally, the first cover plate includes a first cover plate body, a first water injection interface plate is integrally formed at one end of the first cover plate body, and a first water injection port is arranged on the first water injection interface plate; the second cover plate includes a second cover plate body, a second water injection interface plate is integrally formed at one end of the second cover plate body, and a second water injection port is arranged on the second water injection interface plate, and the first water injection port and the second water injection port constitute a water injection structure.

[0009] Optionally, the first cover plate body and the second cover plate body both adopt a rectangular-trapezoidal composite structure.

[0010] Optionally, the water injection structure adopts a conical contraction structure.

[0011] In addition, the present application also provides a method for preparing a heat spreader with a capillary structure, the method comprising: performing water injection port processing and forming on a first cover plate and a second cover plate to obtain a first cover plate with a first water injection port and a second cover plate with a second water injection port; constructing a capillary structure of the heat spreader; assembling and initially sealing the constructed capillary structure of the heat spreader based on the first cover plate with the first water injection port and the second cover plate with the second water injection port to obtain a heat spreader with a capillary structure that is not completely closed; performing internal processing and secondary sealing on the heat spreader with a capillary structure that is not completely closed to obtain a heat spreader with a capillary structure that is completely closed.

[0012] Optionally, constructing the heat spreader capillary structure includes: cutting the metal mesh to form grooves of specific shape and size; constructing a mesh support frame on the cut metal mesh; placing the braided wire in the groove and fixing it through the mesh support frame to complete the construction of the heat spreader capillary structure.

[0013] Optionally, the constructed heat spreader capillary structure is assembled and initially sealed based on the first cover plate and the second cover plate, including: performing a first membrane treatment on the heat spreader capillary structure; placing the heat spreader capillary structure after the first membrane treatment between the first cover plate and the second cover plate; and welding the first cover plate and the second cover plate to obtain a heat spreader with a capillary structure that is not completely closed.

[0014] Optionally, the heat spreader capillary structure is subjected to a first membrane treatment, including: cleaning the heat spreader capillary structure; pre-treating the cleaned heat spreader capillary structure; preparing a membrane solution, immersing the pre-treated heat spreader capillary structure in the prepared membrane solution, and air-drying at room temperature after immersion.

[0015] Optionally, the heat spreader with a capillary structure that is not completely closed is subjected to internal treatment and secondary sealing, including: performing a second membrane treatment on the heat spreader with a capillary structure that is not completely closed through a first water injection port and a second water injection port; and applying glue to reinforce the heat spreader with a capillary structure that is not completely closed after the second membrane treatment to obtain a completely closed heat spreader with a capillary structure.

[0016] The present application can bring the following beneficial effects: The present application effectively solves the water return difficulty problem in the process of manufacturing ultra-thin heat spreader by cutting grooves on the metal mesh and setting braided wires and mesh support frames to form a fluid circulation structure. The present application not only enhances the ability of the fluid to move along the braided wires, improves the water return efficiency and heat dissipation performance, but also increases the effectiveness of heat conduction through a special cover plate structure design, and optimizes the water injection structure to improve the injection efficiency and prevent the backflow of the working fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a method for preparing a vapor chamber with a capillary structure provided by an embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of a heat spreader with a capillary structure provided by an embodiment of the present application;

[0019] Figure 3 yes Figure 2 A schematic structural diagram of the first cover plate in the structure shown;

[0020] Figure 4 yes Figure 2 A schematic diagram of the structure of the second cover plate in the structure shown;

[0021] Figure 5 yes Figure 2 Schematic diagram of the structure of the capillary structure in the structure shown.

[0022] Reference numerals:

[0023] 1. The first cover plate body; 2. The first water injection interface plate; 3. The first water injection port; 4. The second cover plate body; 5. The second water injection interface plate; 6. The second water injection port; 7. The mesh support frame; 8. The groove; 9. The braided wire. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0028] Figure 1 FIG. 1 is a schematic flow chart of a method for preparing a vapor chamber with a capillary structure according to an embodiment of the present application. Figure 1 As shown, the method includes:

[0029] S1: using a stamping tool to process and form water injection ports on the first cover plate and the second cover plate to obtain a first cover plate having a first water injection port and a second cover plate having a second water injection port;

[0030] In this step, water injection ports are formed on the first cover plate and the second cover plate, so as to subsequently inject working fluid into the vapor chamber for membrane treatment, wherein the working fluid includes, for example, water or other working fluids;

[0031] S2: Constructing the capillary structure of the heat spreader, including:

[0032] S21: Cut the metal mesh using special tools (such as cutting machines, stamping dies, CNC shearing machines, etc.) to construct grooves of specific shapes and sizes;

[0033] In this step, the width of the groove must be sufficient to accommodate the braided wire and allow it to move freely but not loose. Usually, the width of the groove needs to be slightly larger than the diameter of the braided wire by 0.1mm to 0.3mm to ensure a good fit. The depth of the groove should be sufficient to make the braided wire flush with the surface of the metal mesh or slightly lower than the surface after embedding to prevent it from being damaged during subsequent processing. Generally, the depth of the groove is set to 1.2 to 1.5 times the diameter of the braided wire. The length of the groove depends on the design of the heat spreader and the area to be covered. It should be long enough to ensure that the braided wire can completely pass through the entire capillary structure without exceeding the predetermined boundary.

[0034] S22: On the cut metal mesh, the intersection points of the metal wires are welded together at designated positions by a spot welding machine to construct a required mesh support frame;

[0035] S23: placing the braided wire (fiber wire) in the groove and firmly locking it through the fixed points on the mesh support frame to ensure that the braided wire exists stably on the specified path, thereby completing the construction of the capillary structure of the heat spreader.

[0036] In the capillary structure obtained by constructing based on the above steps, the presence of the groove is mainly used to provide physical positioning for the braided wire to ensure that the braided wire can be accurately placed. This orderly arrangement helps to form a continuous and regular fluid channel, reduce the resistance during the fluid flow process, and allow the fluid to return from the condensation area to the evaporation area more smoothly. In addition to providing structural support for the braided wire, the mesh support frame is more importantly able to define a specific flow path. The mesh support frame has high stability, so it can ensure the consistency of the fluid channel and avoid local blockage or turbulence caused by displacement or deformation of the braided wire, thereby improving the return water efficiency. In addition, the groove and the mesh support frame can increase the contact area between the braided wire and the metal mesh surface. A larger contact area means more capillary effect points, which can enhance the ability of the fluid to move along the braided wire and promote the effective transmission of the liquid. Furthermore, the grid-like mesh support frame allows the braided wire to be cross-arranged in a variety of ways to form a complex three-dimensional network structure. This structure is conducive to the uniform distribution of the working fluid throughout the heat spreader, avoiding the formation of local overheating areas, and ensuring that heat can be efficiently conducted and dissipated. The presence of the braided wire can enhance the ability of the fluid to move along it and improve the water return efficiency. This is because in ultra-thin heat spreaders, traditional structural designs may lead to water return difficulties, and the additional capillary effect provided by the braided wire helps overcome this challenge, ensuring that the liquid can return from the condensation area to the evaporation area more quickly, maintaining efficient heat dissipation performance.

[0037] To summarize, by forming grooves and a mesh support frame on the metal mesh, the braided wire can form an efficient, stable and durable fluid circulation structure inside the heat spreader. Through this structure, the fluid can form an effective circulation path between the evaporation zone and the condensation zone, thereby improving the water return rate and further enhancing the overall heat dissipation efficiency of the heat spreader.

[0038] S3: Assembling and initially sealing the constructed vapor chamber capillary structure based on the first cover plate and the second cover plate to obtain a vapor chamber with a capillary structure that is not completely closed, specifically comprising the following steps:

[0039] S31: performing a first film treatment on the capillary structure of the vapor chamber;

[0040] In this step, the first film treatment of the capillary structure by the vapor chamber includes the following steps:

[0041] S311: Cleaning the vapor chamber capillary structure, for example, by using ultrasonic cleaning or a special cleaning agent to thoroughly clean it, and then rinsing it with deionized water and drying it to remove impurities such as oil, dust, etc. on the surface of the vapor chamber capillary structure;

[0042] S312: pre-treating the cleaned vapor chamber capillary structure, for example, chemical etching or physical roughening, to increase the roughness of the surface of the vapor chamber capillary structure and promote film layer adhesion;

[0043] S313: Prepare a membrane-forming solution (for example, including organic silane, fluoride, phosphate, etc.), immerse the pretreated heat spreader capillary structure in the prepared membrane-forming solution, and air-dry at room temperature after immersion to solidify the membrane-forming solution attached to the surface of the heat spreader capillary structure, so as to form a heat spreader capillary structure with a thin film.

[0044] The present application forms a thin film on the surface of the vapor chamber capillary structure by performing a first film treatment on the vapor chamber capillary structure, and the thin film can significantly improve the contact angle between the fluid (such as water) and the metal, thereby improving its wetting performance. In addition, good wettability helps to enhance the capillary force, so that the working fluid can return from the evaporation zone to the condensation zone more quickly, thereby improving the water return efficiency.

[0045] S32: placing the vapor chamber capillary structure after the first film treatment between the first cover plate with the first water injection port and the second cover plate with the second water injection port;

[0046] S32: Use a laser beam to weld and seal the first cover plate with the first water injection port and the second cover plate with the second water injection port to ensure the sealing between the first cover plate and the second cover plate. At the same time, the first water injection port and the second water injection port should be left unsealed.

[0047] S4: performing internal treatment and secondary sealing on the vapor chamber with a capillary structure that is not completely closed, so as to obtain a vapor chamber with a capillary structure that is completely closed. This step specifically includes:

[0048] S41: performing a second membrane treatment on the vapor chamber having a capillary structure that is not completely closed through the first water injection port and the second water injection port;

[0049] In this step, the first water injection port and the second water injection port can be used as channels to inject the chemical solution required for membrane formation into the capillary structure. The specific process includes:

[0050] After laser edge sealing, keep the water inlet unsealed; inject appropriate chemical solutions (such as surfactants, wetting agents, etc.) into the heat spreader through the water inlet to ensure that the solution can fully contact the inner wall and capillary structure. Allow the chemical solution to stay inside for a period of time (such as several hours or a day) to complete the membrane reaction. After the membrane reaction is completed, discharge and recycle the chemical solution through the first and second water inlets, and use ionized water or other solvents suitable for cleaning to thoroughly rinse the inside of the heat spreader through the water inlet to ensure that all unreacted chemicals and possible impurities are completely removed; finally, use compatible glue or sealing materials for gluing and reinforcement to seal the first and second water inlets.

[0051] S42: applying glue to reinforce the incompletely closed heat spreader with a capillary structure after the second membrane treatment to obtain a completely closed heat spreader with a capillary structure.

[0052] In this step, it is necessary to apply glue at the interface between the braided wire and the groove, at the edge seam between the first cover plate and the second cover plate, and at the water injection port closure. In addition, it should be noted that the selected glue must be compatible with the metal material used in the heat spreader and other internal components, and will not cause corrosion or other adverse reactions. Secondly, when applying glue, be careful not to change the final size and tolerance of the product, so as not to affect assembly or use.

[0053] In another exemplary embodiment, the present application also provides a heat spreader having a capillary structure, such as Figure 2 As shown, the heat spreader includes: a first cover plate and a second cover plate, and a capillary structure is encapsulated between the first cover plate and the second cover plate, wherein Figure 5 As shown, the capillary structure includes a metal mesh, which is cut to form a groove 8, and a braided wire 9 is arranged in the groove 8; a mesh support frame 7 is arranged on the metal mesh to fix the braided wire 9; the mesh support frame 7, the groove 8 and the braided wire 9 constitute a fluid circulation structure.

[0054] In this embodiment, the mesh support frame 7 is connected by the intersections of the metal wires on the cut metal mesh. By welding the intersections of the metal wires on the metal mesh, a strong and stable mesh support frame can be formed. The mesh support frame 7 can not only withstand external pressure, but also prevent the internal braided wires from shifting or deforming, thereby ensuring the consistency and stability of the fluid channel. In addition, the mesh support frame 7 defines a specific fluid flow path through fixed metal wire intersections, so that the fluid can circulate in an orderly manner in a predetermined channel, which helps to reduce turbulence and improve the return water efficiency, thereby enhancing the overall heat dissipation efficiency of the heat spreader. Furthermore, the contact between the metal wire intersections and the braided wires can also increase the occurrence points of the capillary effect and improve the ability of the fluid to move along the braided wires, thereby promoting the effective transmission of the fluid.

[0055] In another exemplary embodiment, the cross section of the groove 8 along the extending direction of the braided wire is rectangular.

[0056] In this embodiment, the cross-section of the groove 8 along the extension direction of the braided wire is designed to be rectangular, so the right-angled sides of the groove 8 can better disperse the stress acting on it, avoid stress concentration at a certain point and cause deformation or damage, and help improve the mechanical strength and durability of the entire capillary structure. In addition, the groove 8 with a rectangular cross-section along the extension direction of the braided wire has a larger plane, which can increase the contact area between the braided wire 9 and the surface of the metal mesh, and can avoid local blockage or turbulence caused by displacement or deformation of the braided wire 9, so as to improve the ability of the working fluid to move along the braided wire, thereby promoting the effective transmission of the liquid and enhancing the overall heat dissipation efficiency of the heat spreader.

[0057] In another exemplary embodiment, the first cover plate includes a first cover plate body 1, one end of which is integrally provided with a first water injection interface plate 2, and the first water injection interface plate 2 is provided with a first water injection port 3; the second cover plate includes a second cover plate body 4, one end of which is integrally provided with a second water injection interface plate 5, and the second water injection interface plate 5 is provided with a second water injection port 6, and the first water injection port 3 and the second water injection port 6 constitute a water injection structure.

[0058] In this embodiment, the first cover plate body 1 and the second cover plate body 4 both adopt a rectangular-trapezoidal composite structure, that is, the upper half of the first cover plate body 1 and the second cover plate body 4 are both rectangular in design, and the lower half are both trapezoidal in design. Among them, the trapezoidal part can make the contact area between the first cover plate body 1 and the second cover plate body 4 and the heat source larger, especially when the heat spreader needs to cover an irregular shape or inclined surface, it helps to distribute heat more evenly and improve the effective heat conduction from the heat source to the heat spreader. In addition, the trapezoidal part can also guide the flow path of the internal fluid, especially the hypotenuse of the trapezoid helps to guide the fluid to concentrate in the central area, which can help to form a more orderly fluid circulation structure, thereby enhancing the liquid reflux between the evaporation zone and the condensation zone, and improving the overall heat dissipation efficiency. Furthermore, the first cover plate and the second cover plate with this composite structure can better distribute stress under different stress conditions to avoid deformation or damage caused by stress concentration at a certain point, wherein the trapezoidal part can provide additional support points, thereby enhancing the overall rigidity and compressive resistance of the first cover plate and the second cover plate.

[0059] It should be noted that the capillary structure matches the shape of the first cover plate body 1 and the second cover plate body 4, and also adopts a rectangular-trapezoidal composite structure. Since the capillary structure adopts the same structure as the first cover plate body 1 and the second cover plate body 4, the capillary structure and the first cover plate body 1 and the second cover plate body 4 can fit together perfectly, ensuring the consistency and continuity of the internal fluid channel, and helping to avoid local stress concentration or poor sealing problems caused by shape mismatch. In this structure, on the one hand, the trapezoidal part can help distribute the heat from the heat source more evenly, especially when the heat spreader needs to cover an irregular shape or inclined surface; on the other hand, the trapezoidal part can serve as a guide for fluid flow through a gradually narrowing design, strengthening the guidance of the fluid to concentrate in the central area to form a more orderly fluid circulation structure, thereby enhancing the liquid reflux between the evaporation zone and the condensation zone and improving the overall heat dissipation efficiency. In addition, the rectangular part provides sufficient contact area to ensure effective heat conduction from the heat source to the heat spreader.

[0060] The first water injection interface plate 2 and the second water injection interface plate 5, as part of the first cover plate and the second cover plate, have been precisely aligned with the cover plate body during the manufacturing process. When the first cover plate and the second cover plate need to be assembled, it is only necessary to ensure that the first water injection interface plate 2 is aligned with the second water injection interface plate 5 to ensure the correct docking between the first cover plate and the second cover plate, thereby simplifying the assembly process of the entire heat spreader, reducing assembly steps, and improving production efficiency. In addition, if the water injection port needs to be maintained or replaced, it is only necessary to operate the water injection port plate without making large-scale changes to the entire cover plate, thereby making the heat spreader easy to repair and maintain.

[0061] In another exemplary embodiment, the water injection structure adopts a conical contraction structure.

[0062] In this embodiment, Figure 3 and Figure 4 As shown, the water injection structure adopts a conical contraction structure, which means that the diameter of the water injection structure gradually decreases from the inlet direction to the inside. The diameter of the water injection structure is gradually reduced, which can effectively guide and control the flow direction of the injected or extracted working fluid, reduce the possibility of turbulence and bubble formation, and thus improve the injection efficiency. In addition, the structure with a gradually reduced diameter can also act as a one-way valve (according to Bernoulli's principle, during the flow of fluid, as the cross-sectional area of ​​the pipeline decreases, the flow rate increases and the static pressure decreases; conversely, when the fluid enters a larger cross-sectional area, the flow rate slows down and the static pressure increases. In a gradually reduced channel, when the fluid flows from a large cross-section to a small cross-section, the static pressure generated is lower due to the faster flow rate, which helps the fluid to pass smoothly. However, if the fluid tries to flow in the reverse direction, that is, return from a small cross-section to a large cross-section, it will encounter a higher static pressure resistance, because at this time the fluid needs to overcome the low pressure area formed by the rapid flow before, making the reverse flow difficult), which can prevent the injected fluid from flowing out in the reverse direction before the heat plate is completely closed.

[0063] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A heat spreader with a capillary structure, characterized in that: The heat sink comprises: a first cover plate and a second cover plate, A capillary structure is encapsulated between the first cover plate and the second cover plate, wherein: The capillary structure comprises a metal mesh, the metal mesh is cut to form a groove (8), and a braided wire (9) is arranged in the groove (8); A mesh support frame (7) is provided on the metal mesh, and the mesh support frame (7) is used to fix the braided wire (9); The mesh support frame (7), the groove (8) and the braided wire (9) form a fluid circulation structure.

2. The heat sink with a capillary structure according to claim 1, characterized in that: The cross section of the groove (8) along the extension direction of the braided wire is rectangular.

3. The heat sink with a capillary structure according to claim 1, characterized in that: The first cover plate comprises: A first cover plate body (1), one end of which is integrally formed with a first water injection interface plate (2), and the first water injection interface plate (2) is provided with a first water injection port (3); The second cover plate comprises: A second cover plate body (4), one end of which is integrally formed with a second water injection interface plate (5), the second water injection interface plate (5) being provided with a second water injection port (6), the first water injection port (3) and the second water injection port (6) forming a water injection structure.

4. The heat sink with a capillary structure according to claim 3, characterized in that: The first cover plate body (1) and the second cover plate body (4) both adopt a rectangular-trapezoidal composite structure.

5. The vapor chamber with a capillary structure according to claim 3, characterized in that: The water injection structure adopts a conical contraction structure.

6. A method for preparing a heat spreader with a capillary structure, characterized in that: The method comprises: Processing and forming water injection ports on the first cover plate and the second cover plate to obtain a first cover plate having a first water injection port and a second cover plate having a second water injection port; Construct a capillary structure of a heat spreader; Assembling and initially sealing the constructed vapor chamber capillary structure based on the first cover plate and the second cover plate to obtain a vapor chamber with a capillary structure that is not completely closed; The incompletely enclosed vapor chamber with a capillary structure is subjected to internal treatment and secondary sealing to obtain a completely enclosed vapor chamber with a capillary structure.

7. The preparation method according to claim 6, characterized in that: The method of constructing a vapor chamber capillary structure comprises: Cutting the metal mesh to form grooves of specific shapes and sizes; Construct a mesh support frame on the cut metal mesh; The braided wire is placed in the groove and fixed by the mesh support frame.

8. The preparation method according to claim 6, characterized in that: Assembling and initially sealing the constructed vapor chamber capillary structure based on the first cover plate and the second cover plate includes: Performing a first film treatment on the capillary structure of the vapor chamber; Placing the vapor chamber capillary structure after the first film treatment between the first cover plate and the second cover plate; The first cover plate and the second cover plate are welded and sealed to obtain an incompletely sealed heat spreader with a capillary structure.

9. The preparation method according to claim 8, characterized in that: The first film treatment is performed on the capillary structure of the vapor chamber, including: Cleaning the capillary structure of the heat spreader; Pre-treating the cleaned vapor chamber capillary structure; A membrane solution is prepared, and the pretreated vapor chamber capillary structure is immersed in the prepared membrane solution, and then air-dried at room temperature.

10. The preparation method according to claim 6, characterized in that: The incompletely enclosed vapor chamber with a capillary structure is subjected to internal treatment and secondary sealing, including: Performing a second membrane treatment on the incompletely closed vapor chamber with a capillary structure through the first water injection port and the second water injection port; The incompletely closed heat spreader with a capillary structure after the second membrane treatment is reinforced with glue to obtain a completely closed heat spreader with a capillary structure.

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