Vapor chamber
By using a copper-aluminum composite plate and woven mesh design, the issues of lightweighting and structural strength of the heat spreader are solved, achieving good thermal conductivity and heat dissipation effects and stability, ensuring uniform heat distribution, and improving the heat dissipation performance of electronic devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-03-24
AI Technical Summary
Existing heat spreaders are insufficient in terms of weight reduction and thinness, and their structural strength is inadequate, resulting in poor heat dissipation and a tendency for the plate to collapse during use.
The structure uses a copper-aluminum composite plate, combined with a woven mesh and groove design to form a closed inner cavity to hold the cooling medium. The woven mesh is fixed by protrusions that abut against it, ensuring stable circulation of the cooling medium and uniform heat distribution.
The vapor chamber has been made lighter and thinner, while improving structural strength and heat dissipation, ensuring uniform heat distribution, reducing heat transfer resistance, and extending service life.
Smart Images
Figure CN224037669U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of heat dissipation, particularly relates to a uniform temperature plate. BACKGROUND
[0002] With the development of electronic and electrical technology and the improvement of user demand, the functions of various electronic products in daily life, scientific research and education are more and more, the power is more and more big, and the heat of electronic products is more and more serious. Vapor chamber (VC) is an ideal solution to solve the heat dissipation problem of various electronic products,
[0003] With the demand for portability of electronic products, higher requirements are put forward for the lightness and thinness of the vapor chamber, and the vapor chamber in the prior art not only has high manufacturing cost and poor heat dissipation effect, but also has insufficient structural strength, and is prone to collapse of the plate body after softening under heat in the use process.
[0004] Therefore, it is necessary to provide a new vapor chamber to solve at least one of the above technical problems. INVENTION CONTENTS
[0005] The utility model aims at providing a kind of vapor chamber, the vapor chamber not only has good heat conduction and heat dissipation effect, also has lightness and thinness and good structural strength.
[0006] The utility model discloses the following technical solutions are adopted to realize the purpose:
[0007] The utility model provides a kind of vapor chamber, the vapor chamber has the hot end with heat source contact and the cold end away from the heat source and the first direction from the hot end to the cold end and the second direction perpendicular to the first direction, it is characterized in that, the vapor chamber includes:
[0008] First composite board, the first composite board has the first copper surface and the first aluminum back surface being oppositely arranged along the thickness direction, the first composite board is provided with first recess, and the first recess is recessed to form by part of the first copper surface to the first composite board interior;
[0009] Second composite board, the second composite board has the second aluminum surface and the second copper back surface being oppositely arranged along the thickness direction, the second composite board is provided with multiple columns of protrusions spaced apart along the second direction, and the second recess is formed between the two adjacent columns of protrusions, and the protrusion is recessed to form by part of the second aluminum surface to the second composite board interior;
[0010] The material of the first composite board and the second composite board is same, and both have copper and aluminum two kinds of materials;
[0011] Woven mesh, the woven mesh is attached in the first recess of the first composite board;
[0012] The first copper surface of the first composite plate and the second copper back surface of the second composite plate are overlapped, and the first composite plate and the second composite plate are fixedly connected, so that a closed inner cavity is formed between the first composite plate and the second composite plate, and the closed inner cavity is used for accommodating the woven mesh and the cooling working medium of the uniform temperature plate.
[0013] The protrusion is in abutment with the woven mesh.
[0014] The utility model discloses the beneficial effect at least in: the present application has improved the heat dissipation effect and structural strength of the uniform temperature plate, has good thermal conductivity and structural stability while, realizes the light thin of uniform temperature plate.
[0015] I. By adopting the first composite plate of copper aluminum material when being close to the heat source, heat is conveniently conducted to the whole uniform temperature plate through the first composite plate, and by adopting the second composite plate of copper aluminum material when being far away from the heat source, the second composite plate can fully dissipate the heat conducted to the uniform temperature plate from the heat source, improve the heat dissipation effect of the uniform temperature plate, and realize the light thin of the uniform temperature plate.
[0016] II. By utilizing the capillary action of the woven mesh, the cooling working medium in the uniform temperature plate can be rapidly returned to the heat source after being evaporated under heat, the heat conduction efficiency is improved, the continuous heat conduction cycle is maintained, and the heat dissipation effect of the uniform temperature plate is further improved.
[0017] III. By abutting the protrusion with the woven mesh, the protrusion can be fixed to the woven mesh, the woven mesh can be fixed between the first composite plate and the second composite plate, and the stability of the woven mesh in the uniform temperature plate is improved.
[0018] IV. By the first groove and the second groove, a large enough steam passage can be formed, steam can be more fully diffused, efficient heat transfer in the uniform temperature plate is ensured, heat is more evenly distributed on the whole uniform temperature plate, the heat dissipation effect of the uniform temperature plate is enhanced, and the evaporation effect is affected due to the small steam passage and the non-uniform distribution of heat on the whole uniform temperature plate.
[0019] In some possible embodiments, the protrusion does not contact the inner wall of the first groove.
[0020] In some possible embodiments, the depth of the second groove is less than the depth of the first groove.
[0021] In some possible embodiments, the thickness of the woven mesh is less than the depth of the second groove.
[0022] In some possible implementation manners, the first composite plate comprises a first copper cover plate and a first aluminum cover plate arranged in a stack; and the second composite plate comprises a second aluminum cover plate and a second copper cover plate arranged in a stack.
[0023] The first aluminum cover plate has a first aluminum surface and a first aluminum back surface arranged oppositely along a thickness direction, the first copper cover plate has a first copper surface and a first copper back surface arranged oppositely along the thickness direction, the first aluminum surface and the first copper back surface are attached, and part of the first copper surface is recessed inward of the first composite plate to form the first groove.
[0024] The second aluminum cover plate has a second aluminum surface and a second aluminum back surface arranged oppositely along a thickness direction, the second copper cover plate has a second copper surface and a second copper back surface arranged oppositely along the thickness direction, the second aluminum back surface and the second copper surface are attached, and part of the second aluminum surface is recessed inward of the first composite plate to form a plurality of rows of the protrusions, and a second groove is formed between two adjacent rows of the protrusions.
[0025] In some possible implementation manners, the first copper cover plate has a thickness of 0.005-0.1 mm, and the first aluminum cover plate has a thickness of 0.01-0.1 mm; the second copper cover plate has a thickness of 0.005-0.1 mm, and the second aluminum cover plate has a thickness of 0.01-0.1 mm.
[0026] In some possible implementation manners, the first composite plate and the second composite plate are fixedly connected through diffusion welding.
[0027] In some possible implementation manners, the first composite plate and the second composite plate are fixedly connected through laser welding. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 FIG. 1 is a cross-sectional structure schematic view of a heat spreader prepared in an embodiment of the present application;
[0029] Figure 2 FIG. 2 is a top view structure schematic view of the heat spreader in FIG. 1; Figure 1
[0030] Figure 3 FIG. 3 is a cross-sectional structure schematic view of a heat spreader prepared in another embodiment of the present application;
[0031] Figure 4 FIG. 4 is a top view structure schematic view of the heat spreader in FIG. 3. Figure 3
[0032] In the drawings, 1 is a first composite plate; 2 is a second composite plate; 3 is a woven mesh; 11 is a first aluminum cover plate; 12 is a first copper cover plate; 13 is a first groove; 21 is a second aluminum cover plate; 22 is a second copper cover plate; 23 is a protrusion; and 24 is a second groove. DETAILED DESCRIPTION
[0033] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings, and the repeated description of like elements will be omitted for sake of brevity.
[0034] Reference Figures 1-4 , Figure 1 and 3 The uniform plate provided by the embodiments of the present application has a hot end in contact with a heat source and a cold end away from the heat source, a first direction F1 pointing from the hot end to the cold end, and a second direction F2 perpendicular to the first direction, and comprises a first composite plate 1, a second composite plate 2, and a woven mesh 3.
[0035] The first composite plate 1 has a first copper surface and a first aluminum back surface oppositely arranged along the thickness direction, and is provided with a first groove 13 recessed from the first composite plate 1 inside by part of the first copper surface.
[0036] The second composite plate 2 has a second aluminum surface and a second copper back surface oppositely arranged along the thickness direction, and is provided with a plurality of rows of protrusions 23 spaced apart along the second direction, and a second groove 24 is formed between the two adjacent rows of protrusions 23, and the protrusions 23 are recessed from the second composite plate 2 inside by part of the second aluminum surface.
[0037] The cross-sectional shape of the first groove 13 and the second groove 24 can be rectangular, isosceles trapezoidal, etc., and the embodiment is preferably isosceles trapezoidal. The first groove 13 and the second groove 24 form a large enough vapor channel, so that the vapor can be more fully diffused, to ensure efficient heat transfer in the uniform plate, so that the heat is more evenly distributed on the entire uniform plate, to enhance the heat conduction and heat dissipation effect of the uniform plate.
[0038] In some specific embodiments, the first composite plate 1 comprises a first copper cover plate 12 and a first aluminum cover plate 11 arranged in layers, the first aluminum cover plate 11 has a first aluminum surface and a first aluminum back surface oppositely arranged along the thickness direction, the first copper cover plate 12 has a first copper surface and a first copper back surface oppositely arranged along the thickness direction, the first aluminum surface and the first copper back surface are attached, and part of the first copper surface is recessed to form the first groove 13 inside the first composite plate 1. Preferably, the first composite plate 1 is symmetrical with respect to the center line of the first groove 13.
[0039] The second composite plate 2 comprises a second aluminum cover plate 21 and a second copper cover plate 22 stacked together, the second aluminum cover plate 21 has a second aluminum surface and a second aluminum back surface oppositely arranged along the thickness direction, the second copper cover plate 22 has a second copper surface and a second copper back surface oppositely arranged along the thickness direction, the second aluminum back surface and the second copper surface are attached together, and part of the second aluminum surface is recessed inwardly to form a plurality of rows of protrusions 23, and a second groove 24 is formed between two adjacent rows of protrusions.
[0040] Preferably, when the protrusions 23 are even in number, the second composite plate 2 is symmetrical relative to the center line of the most central second groove 24 among all the second grooves 24; when the protrusions 23 are odd in number, the second composite plate 2 is symmetrical relative to the center line of the most central protrusion 23 among all the protrusions 23.
[0041] When the first composite plate 1 is close to the heat source, the material of the first composite plate 1 comprises copper having excellent thermal conductivity and ductility, and aluminum having excellent thermal conductivity, light weight, ductility and corrosion resistance, so that the heat source can conduct heat to the entire vapor chamber through the first composite plate 1.
[0042] The second composite plate 2 is away from the heat source, and the material of the second composite plate 2 also comprises copper having excellent thermal conductivity and ductility, and aluminum having excellent thermal conductivity, light weight, ductility and corrosion resistance, so that the second composite plate 2 can sufficiently dissipate the heat conducted into the vapor chamber by the heat source.
[0043] It should be noted that the thickness of the first copper cover plate 12 is 0.005-0.1 mm, and the thickness of the first aluminum cover plate 11 is 0.01-0.1 mm; the thickness of the second copper cover plate 22 is 0.005-0.1 mm; and the thickness of the second aluminum cover plate 21 is 0.01-0.1 mm. The above thickness specifications can improve the heat dissipation effect of the vapor chamber while achieving ultra-thin. In this embodiment, the thickness of the first copper cover plate 12 is preferably 0.01 mm, the thickness of the first aluminum cover plate 11 is preferably 0.04 mm; the thickness of the second copper cover plate 22 is preferably 0.01 mm; and the thickness of the second aluminum cover plate 21 is preferably 0.04 mm.
[0044] The woven mesh 3 is attached to the first groove 13 of the first composite plate 1. It should be noted that the material of the woven mesh 3 is copper, and the thickness (T) can be 0.035 mm, 0.045 mm or 0.06 mm. In this embodiment, the thickness of the woven mesh 3 is 0.045 mm, which is attached to the groove bottom wall of the first groove 13 of the first composite plate 1.
[0045] It should be noted that the woven mesh 3 can be welded and attached to the groove bottom wall of the first groove 13 of the first composite plate 1 by diffusion welding; or the woven mesh 3 can be fixed to the groove bottom wall of the first groove 13 of the first composite plate 1 by resistance welding or laser welding.
[0046] In order to ensure that the woven mesh 3 and the first composite plate 1 have good bonding strength, the embodiment first fixes part of the woven mesh 3 in the first groove 13 of the first composite plate 1 through resistance welding or laser welding for positioning, and then tightly adheres the woven mesh 3 to the groove bottom wall of the first groove 13 of the first composite plate 1 through diffusion welding. The process conditions of diffusion welding include: the welding gas is a nitrogen-hydrogen mixed gas (nitrogen accounts for 5-10%), the gas flow rate is 100-200 L / min, the welding temperature is 250-500°C, and the welding pressure is 10000-20000PSL.
[0047] It can be understood that the woven mesh 3 is adhered to the groove bottom of the first groove 13 through diffusion welding. On the one hand, the capillary action of the woven mesh 3 makes the cooling medium in the vapor chamber quickly return to the heat source after being heated and evaporated, reduces the resistance of the cooling medium during the return process, and thus reduces the overall thermal resistance of the vapor chamber and improves the heat dissipation efficiency, thereby maintaining continuous heat conduction circulation. On the other hand, the woven mesh 3 is adhered to the groove bottom of the first groove 13 and does not extend to the groove wall of the first groove 13, which makes the contact area between the groove wall of the first groove 13 and the cooling medium larger, meaning that the cooling medium is more fully in contact with the inner wall of the first composite plate 1, which can increase the path and efficiency of heat transfer, make the heat more evenly distributed on the entire vapor chamber, and allow more heat to be directly transferred from the first composite plate 1 to the cooling medium, thereby reducing the resistance of heat transfer and improving the heat dissipation efficiency.
[0048] The first copper surface of the first composite plate 1 and the second copper back surface of the second composite plate 2 are overlapped, and the first composite plate 1 and the second composite plate 2 are fixedly connected, so as to form a closed inner cavity between the first composite plate 1 and the second composite plate 2, and the closed inner cavity is used for accommodating the woven mesh 3 and the cooling medium of the vapor chamber.
[0049] It should be noted that the cooling medium is a liquid phase change material, such as liquid water, ethanol, and acetone, etc. Through the transformation process of the cooling medium from liquid to gas and then to liquid, heat is quickly dissipated, thereby playing the heat dissipation effect of the vapor chamber. In order to ensure that the transformation process of the cooling medium from liquid to gas and then to liquid is not affected by impurities, the closed inner cavity is generally in a vacuum state, thereby improving the heat dissipation effect of the vapor chamber.
[0050] Further, the protrusion 23 can play a good fixing role on the woven mesh 3, and ensure that the woven mesh 3 can be tightly fixed between the first composite plate 1 and the second composite plate 2, thereby improving the stability of the woven mesh 3 in the vapor chamber.
[0051] The stable woven mesh 3 structure can ensure that the cooling medium (usually water or other cooling liquid) inside the vapor chamber can circulate smoothly during the evaporation and condensation process. When one end of the vapor chamber is heated, the medium will evaporate into steam, which will diffuse inside the vapor chamber and carry heat. Then, the steam condenses into liquid at the cooler end, releasing heat. During this process, the stability of the woven mesh 3 ensures that the medium can flow smoothly from one area to another, thereby achieving efficient heat transfer. In addition, the stability of the woven mesh 3 also enhances the overall structural strength of the vapor chamber. The vapor chamber may be subjected to various external pressures and impacts during operation, and the stable woven mesh 3 structure can effectively resist these external forces, maintaining the integrity of the vapor chamber. This not only prolongs the service life of the vapor chamber, but also ensures its stability and reliability in various application scenarios. Finally, the stability of the woven mesh 3 also helps to improve the heat conduction efficiency of the vapor chamber. When heat is transferred through the vapor chamber, the woven mesh 3 can quickly conduct heat from the heat source to the entire vapor chamber, achieving uniform heat distribution. This uniform heat effect is crucial for improving the heat dissipation performance of electronic devices, as it can effectively reduce the risk of local overheating, thereby protecting electronic components from damage.
[0052] In some specific embodiments, the thickness of the woven mesh 3 is less than the depth (D1) of the first groove 13. The thickness of the woven mesh 3 + the depth (D2) of the second groove 24 = the depth of the first groove 13, for example, the thickness of the woven mesh 3 is 0.045mm, the depth of the first groove 13 is 0.15mm, and the depth of the second groove 24 is 0.105mm. In a preferred embodiment, the depth of the second groove 24 is greater than the thickness of the woven mesh 3, and the depth of the second groove 24 is preferably greater than 0.105mm. The vapor chamber with this specification has good heat conduction and heat dissipation effect.
[0053] Because the depth of the second groove 24 is greater than the thickness of the woven mesh 3, the contact area between the groove wall of the second groove 24 and the cooling medium inside the vapor chamber becomes larger, meaning that the cooling medium has more complete contact with the inner wall of the second composite plate 2, which can increase the path and efficiency of heat transfer, making the heat more evenly distributed throughout the vapor chamber, allowing more heat to be directly transferred from the second composite plate 2 to the cooling medium, reducing the resistance of heat transfer, and further improving the heat conduction and heat dissipation efficiency.
[0054] In some specific embodiments, the protrusion 23 does not contact the inner wall of the first groove 13, which is to prevent the first composite plate 1 and the second composite plate 2 from being overlapped due to the contact interference between the protrusion 23 and the side wall of the first groove 13, so that the woven mesh 3 cannot fully abut the protrusion 23, affecting the reliability of the vapor chamber, and thus negatively affecting the heat conduction and heat dissipation effect and service life of the vapor chamber.
[0055] In some specific embodiments, the depth of the first groove 13 is greater than the depth of the second groove 24, and the depth of the first groove 13 is 0.15mm, and the depth of the second groove 24 is 0.105mm, on the one hand, in order to ensure that the thickness of the vapor chamber is thinned, on the other hand, to ensure that the first groove 13 can accommodate the woven mesh 3, so that the woven mesh 3 can be in abutment with the protrusion 23.
[0056] In some specific embodiments, referring to Figure 4 As shown in the figure, the first composite plate 1 and the second composite plate 2 are fixedly connected by diffusion welding. The diffusion welding is used to weld the first composite plate 1 and the second composite plate 2 along the preset molecular / atomic diffusion area.
[0057] In some possible embodiments, referring to Figure 2 As shown in the figure, the first composite plate 1 and the second composite plate 2 are fixedly connected by laser welding. The laser welding is used to weld the first composite plate 1 and the second composite plate 2 along the preset sealing edge line.
[0058] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model, and all these changes should belong to the protection scope of the utility model claim.
Claims
1. A vapor chamber having a hot side in contact with a heat source and a cold side away from the heat source and a first direction from the hot side to the cold side and a second direction perpendicular to the first direction, characterized by, The uniform temperature plate comprises: A first composite plate having a first copper surface and a first aluminum back surface oppositely arranged along a thickness direction, the first composite plate being provided with a first groove formed by recessing part of the first copper surface inwardly of the first composite plate; A second composite plate having a second aluminum surface and a second copper back surface oppositely arranged along a thickness direction, the second composite plate being provided with a plurality of columns of protrusions distributed at intervals along the second direction, a second groove being formed between two adjacent columns of protrusions, the protrusions being formed by recessing part of the second aluminum surface inwardly of the second composite plate; The first composite plate and the second composite plate are made of the same material, both having copper and aluminum; A woven mesh fitted in the first groove of the first composite plate; The first copper surface of the first composite plate and the second copper back surface of the second composite plate are overlapped, and the first composite plate and the second composite plate are fixedly connected, so that a closed inner cavity is formed between the first composite plate and the second composite plate, the closed inner cavity being used for accommodating the woven mesh and a cooling working medium of the uniform temperature plate; The protrusions are in abutment with the woven mesh.
2. The vapor chamber of claim 1, wherein, The protrusions are not in contact with the inner wall of the first groove.
3. The vapor chamber of claim 1, wherein, The depth of the second groove is smaller than the depth of the first groove.
4. The vapor chamber of claim 1, wherein, The thickness of the woven mesh is smaller than the depth of the second groove.
5. The vapor chamber of claim 1, wherein, The first composite plate comprises a first copper cover plate and a first aluminum cover plate arranged in layers; and the second composite plate comprises a second aluminum cover plate and a second copper cover plate arranged in layers; The first aluminum cover plate has a first aluminum surface and a first aluminum back surface oppositely arranged along a thickness direction, the first copper cover plate has a first copper surface and a first copper back surface oppositely arranged along a thickness direction, the first aluminum surface and the first copper back surface are fitted, and part of the first copper surface is recessed inwardly of the first composite plate to form the first groove; The second aluminum cover plate has a second aluminum surface and a second aluminum back surface oppositely arranged along a thickness direction, the second copper cover plate has a second copper surface and a second copper back surface oppositely arranged along a thickness direction, the second aluminum back surface and the second copper surface are fitted, and part of the second aluminum surface is recessed inwardly of the second composite plate to form a plurality of columns of protrusions, a second groove being formed between two adjacent columns of protrusions.
6. The vapor chamber of claim 5, wherein, The thickness of the first copper cover plate is 0.005-0.1 mm, the thickness of the first aluminum cover plate is 0.01-0.1 mm, the thickness of the second copper cover plate is 0.005-0.1 mm, and the thickness of the second aluminum cover plate is 0.01-0.1 mm.
7. The vapor chamber of claim 1, wherein, The first composite plate and the second composite plate are fixedly connected by diffusion welding.
8. The vapor chamber of claim 1, wherein, The first composite plate and the second composite plate are fixedly connected by laser welding.