Lightweight VC vapor chamber and manufacturing process thereof

Abstract

The invention discloses a lightweight VC vapor chamber which comprises an upper cover shell, a lower cover shell and a capillary structure, the capillary structure is a nylon net and is arranged between the upper cover shell and the lower cover shell, and working water is quantitatively instilled on the capillary structure. The opposite edges of the upper cover shell and the lower cover shell are provided with sealing double-faced adhesive tape used for vacuum sealing connection, the upper cover shell and the lower cover shell are combined through the sealing double-faced adhesive tape to form a closed flat structure, a vacuum cavity is formed in the closed flat structure, and the capillary structure and the working water liquid are located in the vacuum cavity. Compared with a traditional vapor chamber, a pipe inserting opening / a water filling opening is omitted, the sealing double-faced adhesive tape is pressed and sealed in a vacuum environment, the production process is simplified, equipment investment and labor hour consumption are reduced, the production efficiency is improved, the nylon net serves as a capillary structure, circulation of working water can be effectively achieved, and it is ensured that a product has the stable heat conduction performance; and the nylon net is low in weight and cost, the lightweight requirement of products is met, and the production cost is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of heat exchange plates, specifically relating to a lightweight VC heat exchange plate and its manufacturing process. Background Technology

[0002] VC vapor chambers are high-efficiency heat-conducting components widely used in heat dissipation scenarios in electronic equipment, new energy and other fields. Traditional VC vapor chambers usually use copper or stainless steel as the shell material and copper mesh or stainless steel mesh as the capillary structure. Their manufacturing process requires reserving insertion ports or water injection ports and going through many complex processes such as liquid injection, degassing, vacuuming, sealing and edge cutting. Not only is the overall weight large, but the production process is also cumbersome and costly, making it difficult to meet the market demand for lightweight and low-cost products. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a lightweight VC vapor chamber plate and its manufacturing process, thereby solving the problems of large overall weight, complicated manufacturing process, and high production cost of existing VC vapor chamber plates.

[0004] This invention is achieved through the following technical solution: a lightweight VC heat spreader, comprising an upper cover shell, a lower cover shell, and a capillary structure. The capillary structure is a nylon mesh disposed between the upper cover shell and the lower cover shell. A working liquid is quantitatively dripped onto the capillary structure. Double-sided sealing adhesive is provided at the opposite edges of the upper cover shell and the lower cover shell for vacuum sealing connection. The upper cover shell and the lower cover shell are combined by the double-sided sealing adhesive to form a closed flat structure, which forms a vacuum cavity inside. The capillary structure and the working liquid are located inside the vacuum cavity.

[0005] Furthermore, both the upper cover and the lower cover are made of aluminum.

[0006] Furthermore, the inner side of the upper cover housing has two sets of protrusions arranged in an alternating pattern, and sealing ring edges are reserved at the edges of both the upper and lower cover housings. The middle part of the lower cover housing protrudes from the inside out to form a groove that accommodates the two sets of protrusions.

[0007] Furthermore, the upper cover and lower cover have a wide end of 58.7±0.15mm and a narrow end of 49.65±0.15mm at their ends, respectively, both with a length of 101.17±0.15mm and a thickness of 0.05±0.005mm. The width of the sealing ring edge is 2.35±0.15mm, the height of the boss is 0.17±0.02mm, and the depth of the groove is 0.21±0.02mm.

[0008] Furthermore, the upper cover and lower cover are passivated, and a passivation film is formed on their surfaces.

[0009] Furthermore, the nylon mesh is attached to a fixing adhesive paper, the cutting shape of which is adapted to the cutting shape of the nylon mesh.

[0010] This invention also provides a manufacturing process for a lightweight VC vapor chamber, comprising the following steps: S1. Shell pretreatment: The upper and lower shells are made of aluminum and processed into a predetermined shape. They are then immersed in a passivation solution for passivation treatment. After that, they are rinsed with deionized water to remove residual passivation solution and then dried at 60-80℃ for 30-60 minutes. S2. Capillary Structure and Working Fluid Setting: Cut the nylon mesh to the appropriate size and place it in the preset position inside the lower cover housing; according to the product size and heat dissipation requirements, drip a quantitative amount of working fluid onto the nylon mesh using a precision dripping device, with the dripping accuracy controlled within ±0.01ml; S3. Sealing preparation: Evenly apply double-sided sealing tape to the edge of the sealing ring of the upper cover shell, ensuring that the adhesive surface completely covers the bonding area; S4. Vacuum pressing: Align the upper cover and lower cover, place them in a vacuum device, and apply pressure in a vacuum environment to keep the upper cover and lower cover pressed together until the double-sided sealing adhesive is fully adhered, forming a closed cavity with an internal vacuum state. S5. Cold pressing and shaping: Transfer the pressed closed cavity to a cold pressing device and apply 1-3MPa pressure to shape it for 20-40 seconds to make its shape and flatness meet the preset standards. S6. Performance Testing: Conduct thermal conductivity tests on the cold-pressed and shaped products to select qualified products.

[0011] Compared to traditional heat spreaders, this invention eliminates the need for pipe / water inlet ports, and removes cumbersome processes such as laser sealing and edge trimming. Sealing is achieved through double-sided adhesive under vacuum, replacing the traditional step-by-step process of vacuuming and laser sealing after liquid injection. This simplifies the production process, reduces equipment investment and labor costs, and improves production efficiency. The nylon mesh, as a capillary structure, effectively circulates the working fluid, ensuring stable thermal conductivity. Furthermore, the weight and cost of nylon mesh are lower than copper / stainless steel, meeting the requirements for lightweight products and reducing production costs. Attached Figure Description

[0012] Figure 1 This is an exploded view of the three-dimensional structure of the present invention; Figure 2 This is a bottom view of the upper cover shell in this invention; Figure 3 This is a top view of the lower cover housing in this invention; Figure 4 This is a schematic cross-sectional view of part of the structure in the combined state of the present invention; Figure 5 This is an enlarged cross-sectional schematic diagram of a portion of the structure in the combined state of the present invention.

[0013] The attached figures are labeled as follows: 1. Upper cover housing; 11. Groove; 2. Lower cover housing; 21. Boss; 3. Nylon mesh; 31. Fixing adhesive tape; 4. Sealing ring edge. Detailed Implementation

[0014] The invention will be further illustrated below with reference to specific examples and accompanying drawings.

[0015] like Figures 1-5 As shown, the present invention relates to a lightweight VC heat spreader, comprising an upper cover shell 1, a lower cover shell 2, and a capillary structure. The capillary structure is a nylon mesh 3, disposed between the upper cover shell 1 and the lower cover shell 2. A working liquid is quantitatively dripped onto the capillary structure. Double-sided sealing adhesive is provided at the opposite edges of the upper cover shell 1 and the lower cover shell 2 for vacuum sealing connection. The upper cover shell 1 and the lower cover shell 2 are combined by the double-sided sealing adhesive to form a closed flat structure, which forms a vacuum cavity inside. The capillary structure and the working liquid are located inside the vacuum cavity.

[0016] In this invention, the boiling point of the working liquid in the vacuum chamber is lower than that under normal pressure, allowing it to easily undergo phase change (i.e., vaporization) at the heat dissipation temperature of electronic devices. During vaporization, a large amount of heat is carried away to achieve a heat dissipation effect. By using nylon mesh 3 as a capillary structure and laying it between the upper cover shell 1 and the lower cover shell 2, the pores of the nylon mesh 3 provide a dispersion space for the vaporization of the working liquid, avoiding the working liquid from vaporizing at a certain point and causing local overheating. At the same time, the vaporized working liquid can quickly diffuse to all parts of the vacuum chamber and eventually reach the cold end area with a lower temperature. The cold end area is usually connected to heat dissipation components such as heat sink fins and fans. The vaporized working liquid re-condenses into a liquid state in the cold end area. The liquefied working liquid adheres to the nylon mesh 3 at the cold end. Through the capillary force generated by the tiny pores formed by the interwoven fibers of the nylon mesh 3, the liquefied working liquid is adsorbed back to the heat absorption end to replenish the liquid working liquid consumed by vaporization. Compared to traditional heat spreaders, this invention eliminates the need for pipe / water inlet settings, and removes cumbersome processes such as laser sealing and edge trimming. Sealing is achieved through double-sided adhesive under vacuum, replacing the traditional step-by-step process of vacuuming and laser sealing after liquid injection. This simplifies the production process, reduces equipment investment and labor costs, and improves production efficiency. The nylon mesh 3, as a capillary structure, effectively circulates the working liquid, ensuring stable thermal conductivity. Furthermore, the weight and cost of nylon mesh 3 are lower than copper / stainless steel, meeting the requirements for lightweight products and reducing production costs.

[0017] In this embodiment of the invention, both the upper cover shell 1 and the lower cover shell 2 are made of aluminum, replacing traditional copper or stainless steel, which significantly reduces the overall weight of the VC heat spreader and is more suitable for weight-sensitive application scenarios, further meeting the product's lightweight requirements.

[0018] Because the hardness of aluminum used as the shell is lower than that of copper or stainless steel in traditional heat spreader shells, and the interior is a vacuum cavity (i.e., without air pressure support), if the upper and lower covers are directly attached, the cavity is prone to collapse due to external pressure or temperature changes, thereby damaging the capillary structure and vacuum environment. This invention addresses this by having two sets of protrusions 21 arranged in an alternating pattern on the inner side of the upper cover shell 1. Both the upper cover shell 1 and the lower cover shell 2 have pre-reserved sealing ring edges 4 for attaching double-sided adhesive. The lower cover shell 2 protrudes from the inside out in the middle, forming a groove 11 that accommodates the two sets of protrusions 21. The protrusions 21 directly contact the nylon mesh 3 above the lower cover shell 2, forming a multi-point support structure that acts like a bracket to support the upper and lower parts. The cover shell 2 prevents the cavity from being crushed by atmospheric pressure under vacuum, ensuring that the cavity always maintains the preset internal space (sufficient volume is required for the phase change of the working water). The protrusions 21 are evenly and staggered, which can not only avoid blocking the effective area of ​​the nylon mesh 3, but also form tiny channels between the protrusions 21 to help the vaporized working water diffuse from the heat source area to the cold end, while not hindering the capillary backflow of the liquid working water through the nylon mesh 3, indirectly improving the heat conduction efficiency. In addition, aluminum has good ductility but weak rigidity. By setting protrusions 21 to support and improve rigidity, there is no need to increase the shell thickness (i.e., avoid the weight increase). The support can be enhanced by only local structural protrusions, taking into account the advantages of lightweight and structural strength.

[0019] The upper cover shell 1 and the lower cover shell 2 have a wide end of 58.7±0.15mm and a narrow end of 49.65±0.15mm respectively, both with a length of 101.17±0.15mm and a thickness of 0.05±0.005mm. The width of the sealing ring edge 4 is 2.35±0.15mm, the height of the boss 21 is 0.17±0.02mm, the depth of the groove 11 is 0.21±0.02mm, and a nylon mesh 3 is placed between the bottom surface of the groove 11 and the top surface of the boss 21.

[0020] Furthermore, the upper cover housing 1 and the lower cover housing 2 are passivated, and a passivation film is formed on their surfaces, which can improve corrosion resistance and help extend the product's service life.

[0021] To prevent the nylon mesh 3 from shifting due to external forces after placement, thus affecting the sealing performance, a corresponding fixing structure is provided on one side of the nylon mesh 3 in this embodiment of the invention. Specifically, as shown in the figure... Figure 5 As shown, the nylon mesh 3 is attached to the fixing tape 31, and the cutting shape of the fixing tape 31 is adapted to the cutting shape of the nylon mesh 3.

[0022] This invention also provides a manufacturing process for the aforementioned lightweight VC vapor chamber, comprising the following steps: S1. Shell pretreatment: The upper shell 1 and lower shell 2 are made of aluminum material and processed into a preset shape. They are then immersed in passivation solution for passivation treatment to enhance the surface corrosion resistance. After that, they are rinsed with deionized water to remove residual passivation solution and then placed in an environment of 60-80℃ to dry for 30-60 minutes to ensure that the shell surface is dry. S2. Capillary structure and working fluid setting: Cut the nylon mesh 3 to the appropriate size and place it in the preset position inside the lower cover housing 2; according to the product size and heat dissipation requirements, drip a certain amount of working fluid onto the nylon mesh 3 using a precision dripping device, with the dripping accuracy controlled within ±0.01ml to ensure accurate working fluid dosage; S3. Sealing preparation: Evenly apply double-sided sealing tape to the edge sealing ring 4 of the upper cover housing 1, ensuring that the adhesive surface completely covers the bonding area to avoid air leakage during subsequent pressing. S4. Vacuum pressing: Align the upper cover housing 1 and the lower cover housing 2, place them in a vacuum device, and apply pressure in a vacuum environment to keep the upper cover housing 1 and the lower cover housing 2 pressed together until the double-sided sealing adhesive is fully adhered, so as to achieve a sealed connection between the two and form a closed cavity with a vacuum inside. S5. Cold pressing and shaping: Transfer the pressed closed cavity to a cold pressing device and apply 1-3MPa pressure to shape it for 20-40 seconds to make its shape and flatness meet the preset standards. S6. Performance Testing: Conduct thermal conductivity tests on the cold-pressed and shaped products (such as testing parameters like thermal resistance and thermal conductivity) to screen out qualified products.

[0023] The above embodiments are merely preferred embodiments of the present invention and are used only to explain the present invention, not to limit the present invention. Any changes, substitutions, combinations, simplifications, modifications, etc., made by those skilled in the art without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A lightweight VC heat spreader, characterized in that: It includes an upper cover shell (1), a lower cover shell (2) and a capillary structure. The capillary structure is a nylon mesh (3) and is disposed between the upper cover shell (1) and the lower cover shell (2). A working liquid is quantitatively dripped onto the capillary structure. The upper cover shell (1) and the lower cover shell (2) are provided with sealing double-sided adhesive for vacuum sealing connection at their opposite edges. The upper cover shell (1) and the lower cover shell (2) are combined by sealing double-sided adhesive to form a closed flat structure, which forms a vacuum cavity inside. The capillary structure and the working liquid are located in the vacuum cavity.

2. The lightweight VC heat spreader according to claim 1, characterized in that: Both the upper cover shell (1) and the lower cover shell (2) are made of aluminum.

3. The lightweight VC heat spreader according to claim 2, characterized in that: The inner side of the upper cover housing (1) has two sets of protrusions (21) arranged in an alternating pattern. Both the upper cover housing (1) and the lower cover housing (2) have a sealing ring edge (4) reserved at their edges. The middle part of the lower cover housing (2) protrudes from the inside out to form a groove (11) that fits to accommodate the two sets of protrusions (21).

4. A lightweight VC heat spreader according to claim 3, characterized in that: The upper cover housing (1) and the lower cover housing (2) have a wide end of 58.7±0.15mm and a narrow end of 49.65±0.15mm respectively. Their lengths are both 101.17±0.15mm and their thicknesses are both 0.05±0.005mm. The width of the sealing ring edge (4) is 2.35±0.15mm, the height of the boss (21) is 0.17±0.02mm, and the depth of the groove (11) is 0.21±0.02mm.

5. A lightweight VC heat spreader according to claim 1, characterized in that: The upper cover shell (1) and the lower cover shell (2) are passivated, and a passivation film is formed on their surfaces.

6. A lightweight VC heat spreader according to claim 1, characterized in that: The nylon mesh (3) is attached to the fixing tape (31), and the cutting shape of the fixing tape (31) is adapted to the cutting shape of the nylon mesh (3).

7. A manufacturing process for a lightweight VC heat spreader, characterized in that: Includes the following steps: S1. Shell pretreatment: The upper cover shell (1) and lower cover shell (2) are made of aluminum material and processed into a preset shape. They are then immersed in passivation solution for passivation treatment. After that, they are rinsed with deionized water to remove residual passivation solution and then dried at 60-80℃ for 30-60 minutes. S2. Capillary structure and working fluid setting: Cut the nylon mesh (3) to the appropriate size and place it in the preset position inside the lower cover housing (2) and fix it; according to the product size and heat dissipation requirements, drip a certain amount of working fluid onto the nylon mesh (3) through a precision dripping device, and control the dripping accuracy within ±0.01ml; S3. Sealing preparation: Apply double-sided sealing tape evenly to the edge sealing ring (4) of the upper cover housing (1) to ensure that the adhesive surface completely covers the bonding area; S4. Vacuum pressing: Align the upper cover housing (1) and the lower cover housing (2), place them in a vacuum device, apply pressure in a vacuum environment to keep the upper cover housing (1) and the lower cover housing (2) pressed together until the double-sided adhesive is fully adhered to form a closed cavity with a vacuum inside. S5. Cold pressing and shaping: Transfer the pressed closed cavity to a cold pressing device and apply 1-3MPa pressure to shape it for 20-40 seconds to make its shape and flatness meet the preset standards. S6. Performance Testing: Conduct thermal conductivity tests on the cold-pressed and shaped products to select qualified products.

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