Vapor chamber structure with fins and manufacturing process therefor

Abstract

The present invention provides a vapor chamber structure with fins and a manufacturing process therefor. The vapor chamber structure with fins comprises a supporting plate housing, supporting columns, a liquid injection port, liquid suction cores, and a fin cover plate. The supporting columns are arranged in the supporting plate housing in an array manner; the liquid injection port is formed in the outer side of the supporting plate housing and is communicated with the interior of the supporting plate housing; the liquid suction cores surround the supporting columns and are arranged in the supporting plate housing so as to form vapor cavities used for heat exchange, and a welding layer formed for connecting the supporting plate housing and the fin cover plate is provided between adjacent vapor cavities and located on the walls of the liquid suction cores; and the top end of the fin cover plate comprises a plurality of fins arranged in an array manner, and the fin cover plate covers and is fixed to the top end of the supporting plate housing and performs convection heat exchange with the outside by means of the fins. The present invention can effectively solve the problem of too low convection heat exchange efficiency of the vapor chamber, improving the convection heat dissipation efficiency of the vapor chamber.

Description

A heat sink structure with fins and its manufacturing process Technical Field

[0001] The present invention relates to the technical field of vapor chambers, and in particular to a vapor chamber structure with fins and a manufacturing process thereof. Background Art

[0002] As a phase change device with high heat transfer and fast startup characteristics, the heat spreader has been applied in various scenarios and fields across various industries. In recent years, especially for the heat dissipation of high-power electronic products, the heat spreader, as the device with the highest known thermal conductivity, has become the focus of people's attention.

[0003] However, due to its relatively flat surface, the convective heat transfer efficiency between the vapor chamber and the cold source is low. If it is necessary to enhance the convective heat transfer efficiency through air cooling, fins, an effective structure for enhancing convective heat transfer, can be used. However, installing the fins on the vapor chamber by welding will result in uncontrollable contact thermal resistance, and the processing technology is extremely complex.

[0004] Therefore, there is an urgent need for a finned vapor chamber structure and a manufacturing process thereof to solve the problem of poor convective heat transfer effect caused by the contact thermal resistance between the fins and the vapor chamber.

[0005] Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention proposes a heat spreader structure with fins and a manufacturing process thereof, which can effectively improve the convective heat transfer efficiency of the heat spreader.

[0007] A first aspect of the embodiments of the present disclosure provides a finned vapor chamber structure, comprising:

[0008] A support plate shell, support columns, a liquid injection port, a liquid wick and a fin cover plate, wherein the support columns are arranged in an array in the support plate shell, the liquid injection port is arranged on the outside of the support plate shell and is connected to the support plate shell, the liquid wick surrounds the support columns and is arranged in the support plate shell to form a steam chamber for heat exchange, and a welding layer formed on the wall of the liquid wick between adjacent steam chambers for connecting the support plate shell and the fin cover plate is included, and the top end of the fin cover plate includes a plurality of fins arranged in an array, and the fin cover plate is covered and fixed to the top end of the support plate shell and performs convection heat exchange with the outside world through the fins.

[0009] In one embodiment of the present disclosure, the shape of the support column includes cylindrical, variable prism or irregular column.

[0010] In one embodiment of the present disclosure, the support plate housing is made of a metal material or a ceramic material, and the metal material includes but is not limited to copper, copper alloy, aluminum, aluminum alloy, copper-aluminum alloy and stainless steel.

[0011] In one embodiment of the present disclosure, the wick is arranged on the outside of the support column and the bottom and side walls of the support plate shell through sintering processing, and the sintered thickness of the wick is 0.5mm-1.5mm.

[0012] In one embodiment of the present disclosure, the material of the liquid absorbent core is the same metal as the material of the support plate shell, and the structure of the liquid absorbent core includes a mesh liquid absorbent core and a powder liquid absorbent core.

[0013] In one embodiment of the present disclosure, the array arrangement of the support columns includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement, and an irregular array arrangement.

[0014] In one embodiment of the present disclosure, the shapes of the fins include triangle, rectangle, square, polygon, circle, spiral, corrugated, serrated, needle-shaped, longitudinal, plate-shaped and irregular shapes.

[0015] In one embodiment of the present disclosure, the array arrangement of the fins on the fin cover includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement, and an irregular array arrangement.

[0016] In one embodiment of the present disclosure, the liquid injection port is connected to the liquid injection pipe to inject the working medium into the cavity formed by the support plate shell and the fin cover plate.

[0017] According to a second aspect of the embodiments of the present disclosure, a process for manufacturing a finned vapor chamber structure is provided, comprising the following steps:

[0018] Step 1: Processing the phase change material into a support plate shell structure by chemical etching and / or mechanical processing, and processing support columns arranged in an array in the support plate shell;

[0019] Step 2: Using a graphite mold to sinter and process on the support plate shell to form a liquid wick disposed on the outside of the support column and the bottom and side of the support plate shell, so that a steam cavity is formed in the liquid wick;

[0020] Step 3: preparing a fin cover plate with arrayed fins, and sintering a liquid wick at the bottom of the fin cover plate;

[0021] Step 4: Using diffusion welding and / or brazing process to weld the support plate shell and the fin cover plate according to the internal structure of the vapor chamber to form a vapor chamber structure;

[0022] Step 5: Insert the liquid injection tube into the vapor chamber through the liquid injection port and secure it to the liquid injection port using induction welding and / or light-curing resin. Perform a liquid leakage test on the vapor chamber.

[0023] Step 6: The heat spreader that has passed the leakage test is sequentially subjected to the liquid injection process, freezing process, vacuum process, pre-pressing and sealing process, secondary degassing process, cold pressing and sealing process, tail removal process and argon arc welding and / or laser welding repair process to complete the manufacture of the heat spreader structure with fins.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) The present invention improves the structural design and process of the welding between the support columns of the heat spreader, which can improve the heat transfer stability and service life of the heat spreader.

[0026] (2) The present invention uses the heat dissipation fins on the top of the cover plate to conduct convective heat exchange on the heat spreader, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] FIG1 is a schematic diagram of a finned vapor chamber structure according to the present invention;

[0029] FIG2 is a schematic diagram of a support plate housing in a finned soaking plate structure according to the present invention;

[0030] FIG3 is a top view of FIG2 ;

[0031] FIG4 is a side view of FIG2;

[0032] FIG5 is a schematic diagram of a fin cover plate in a finned vapor chamber structure according to the present invention;

[0033] FIG6 is a top view of FIG5;

[0034] FIG7 is a schematic diagram of the structure of the vapor chamber in Example 2;

[0035] FIG8 is a schematic diagram of the structure of the vapor chamber in Example 3;

[0036] FIG9 is a schematic structural diagram of a vapor chamber in Example 4;

[0037] FIG10 is a flow chart of a manufacturing process of a finned vapor chamber structure according to the fifth embodiment;

[0038] FIG11 is a flow chart of a manufacturing process of a finned vapor chamber structure according to a sixth embodiment.

[0039] FIG12 is a schematic structural diagram of the fins in Example 7.

[0040] Figure identification: 1-support plate shell, 2-support column, 3-liquid injection port, 4-liquid absorption core, 5-fin cover plate, 51-fin, 6-steam chamber, 7-welding layer. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0044] Example 1

[0045] Referring to Figures 1 to 6, an embodiment of the present invention discloses a heat spreader structure with fins 51, including: a support plate shell 1, a support column 2, a liquid injection port 3, a liquid absorption core 4 and a fin cover plate 5. The support columns 2 are arranged in an array in the support plate shell 1, the liquid injection port 3 is arranged on the outside of the support plate shell 1 and is connected to the support plate shell 1, the liquid absorption core 4 surrounds the support columns 2 and is arranged in the support plate shell 1 to form a steam chamber 6 for heat exchange, and a welding layer 7 is formed on the wall of the liquid absorption core 4 between adjacent steam chambers 6 for connecting the support plate shell 1 and the fin cover plate 5. The top of the fin cover plate 5 includes a plurality of fins 51 arranged in an array, and the fin cover plate 5 is covered and fixed on the top of the support plate shell 1 and performs convective heat exchange with the outside through the fins 51.

[0046] It should be noted that the heat spreader shell is formed by using a cover plate with fins 51. As a part of the heat spreader, the fins 51 do not have contact thermal resistance, which can make the heat spreader perform heat exchange more efficiently.

[0047] In one embodiment of the present disclosure, the shape of the support column 2 includes a cylindrical shape, a variable prism shape or an irregular column shape.

[0048] In one embodiment of the present disclosure, the support plate housing 1 is made of a metal material or a ceramic material, and the metal includes but is not limited to copper, copper alloy, aluminum, aluminum alloy, copper-aluminum alloy and stainless steel.

[0049] In one embodiment of the present disclosure, the liquid absorbent core 4 is arranged on the outside of the support column 2 and the bottom and side wall of the support plate shell 1 through sintering processing, and the sintered thickness of the liquid absorbent core 4 is 0.5mm-1.5mm.

[0050] In one embodiment of the present disclosure, the material of the liquid absorbent core 4 is the same metal as the material of the support plate shell 1 , and the structure of the liquid absorbent core 4 includes a mesh liquid absorbent core 4 and a powder liquid absorbent core 4 .

[0051] In one embodiment of the present disclosure, the array arrangement of the support columns 2 includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement, and an irregular array arrangement.

[0052] In one embodiment of the present disclosure, the shapes of the fins 51 include triangle, rectangle, square, polygon, circle, spiral, corrugated, serrated, needle-shaped, longitudinal, plate-shaped and irregular shapes.

[0053] In one embodiment of the present disclosure, the array arrangement of the fins 51 on the fin cover 5 includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement and an irregular array arrangement.

[0054] In one embodiment of the present disclosure, the liquid injection port 3 is connected to the liquid injection pipe to inject the working medium into the cavity formed by the support plate shell 1 and the fin cover plate 5.

[0055] The present invention improves the structural design and process of the welding between the heat spreader support columns 2, which can improve the heat transfer stability and service life of the heat spreader. The heat of the heat spreader is transferred to the heat spreader through the fins 51 on the top of the cover plate for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0056] Example 2

[0057] As shown in FIG7 , the difference between the second embodiment of the present invention and the first embodiment is that the support plate shell 1 and the upper cover plate are welded together by diffusion welding and / or brazing process. It should be noted that no matter which welding process is adopted, the internal structure of the heat spreader can be arranged in a variety of ways according to the different welding positions. The first way is shown in the figure, which requires the upper cover plate to reserve more physical dimensions to adapt to the processing of the support plate shell 1. In the first way, the welding layer 7 is located at the bottom of the support plate shell 1, and the sintering of the liquid wick 4 is also carried out in the support plate shell 1, which is adapted to different welding positions of the heat spreader.

[0058] The invention improves the structural design and process of the welding between the heat spreader support columns 2, which can improve the heat transfer stability and service life of the heat spreader. The heat of the heat spreader is transferred to the heat spreader through the fins 51 on the top of the cover plate for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0059] Example 3

[0060] As shown in Figure 8 , the difference between the third embodiment of the present invention and the first embodiment is that diffusion welding and / or brazing are used to weld the support plate housing 1 and the fin cover plate 5 together. It should be noted that regardless of the welding process used, the internal structure of the vapor chamber can be configured in a variety of ways depending on the welding position. The second method, as shown in the figure, requires sintering the wick 4 simultaneously on the support plate housing 1 and the fin cover plate 5. In this case, the weld layer 7 of the vapor chamber is located in the middle of the wick 4.

[0061] The invention improves the structural design and process of the welding between the heat spreader support columns 2, which can improve the heat transfer stability and service life of the heat spreader. The heat of the heat spreader is transferred to the heat spreader through the fins 51 on the top of the cover plate for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0062] Example 4

[0063] As shown in Figure 9, the difference between Example 4 of the present invention and Example 1 is that the fins 51 on the rice cover are prepared by fixing the packaged heat spreader on a milling machine, and the solid area of ​​the upper cover is processed by milling to obtain the fin 51 structure, wherein the type and parameters of the fin 51 are determined according to actual needs, and the shapes of the fins 51 include triangles, rectangles, squares, polygons, circles, spirals, corrugated shapes, serrated shapes, needle shapes, longitudinal shapes, plate shapes and irregular shapes. The array arrangement of the fins 51 on the fin cover 5 includes triangular array arrangement, circular array arrangement, elliptical array arrangement, polygonal array arrangement and irregular array arrangement.

[0064] The present invention improves the structural design and process of the welding between the heat spreader support columns 2, which can improve the heat transfer stability and service life of the heat spreader. The heat of the heat spreader is transferred to the heat spreader through the fins 51 on the top of the cover plate for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0065] Example 5

[0066] The embodiment of the present invention discloses a manufacturing process of a heat sink structure with fins 51, comprising the following steps:

[0067] Step 1: Processing the phase change material into a support plate shell 1 structure by chemical etching and / or mechanical processing, and processing support columns 2 arranged in an array in the support plate shell 1;

[0068] Step 2: Using a graphite mold, sintering is performed on the support plate housing 1 to form a liquid wick 4 disposed on the outside of the support column 2 and the bottom and side of the support plate housing 1, so that a steam chamber 6 is formed in the liquid wick 4;

[0069] Step 3: preparing a fin cover plate 5 with arrayed fins 51, and sintering a liquid absorbent core 4 at the bottom of the fin cover plate 5;

[0070] Step 4: Using diffusion welding and / or brazing process to weld the support plate shell 1 and the fin cover plate 5 according to the internal structure of the vapor chamber to form a vapor chamber structure;

[0071] Step 5: Insert the liquid injection tube into the vapor chamber through the liquid injection port 3 and fix the liquid injection tube in the liquid injection port 3 using induction welding and / or light-curing resin. Test the vapor chamber for liquid leakage.

[0072] Step 6: The heat spreader that has passed the leakage test is sequentially subjected to the liquid injection process, freezing process, vacuum process, pre-pressing and sealing process, secondary degassing process, cold pressing and sealing process, tail removal process and argon arc welding and / or laser welding repair process to complete the manufacture of the heat spreader structure with fins 51.

[0073] After the above steps, a heat spreader structure with fins 51 described in the present invention can be obtained. The welding between the heat spreader support columns 2 is structurally designed and process improved, which can improve the heat transfer stability and service life of the heat spreader. The heat dissipation fins 51 on the top of the cover plate are used to transfer the heat of the heat spreader through the fins 51 for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0074] Example 6

[0075] The difference between the sixth embodiment of the present invention and the fifth embodiment is that a manufacturing process of a vapor chamber structure with fins 51 includes the following steps:

[0076] Step 1: Processing the phase change material into a support plate shell 1 structure by chemical etching and / or mechanical processing, and processing support columns 2 arranged in an array in the support plate shell 1;

[0077] Step 2: Using a graphite mold, sintering is performed on the support plate housing 1 to form a liquid wick 4 disposed on the outside of the support column 2 and the bottom and side of the support plate housing 1, so that a steam chamber 6 is formed in the liquid wick 4;

[0078] Step 3: Prepare a cover plate on the heat spreader, and sinter the liquid absorbent core 4 on the cover plate;

[0079] Step 4: Using diffusion welding and / or brazing process to weld the support plate shell 1 and the upper cover plate according to the internal structure of the vapor chamber to form a vapor chamber structure;

[0080] Step 5: Insert the liquid injection tube into the vapor chamber through the liquid injection port 3 and fix the liquid injection tube in the liquid injection port 3 using induction welding and / or light-curing resin. Test the vapor chamber for liquid leakage.

[0081] Step 6: The vapor chamber that has passed the leakage test is sequentially subjected to the following steps: liquid injection, freezing, vacuuming, pre-pressing and sealing, secondary degassing, cold pressing and sealing, tail removal, and repair welding using argon arc welding and / or laser welding to complete the vapor chamber structure.

[0082] Step 7: Fix the packaged heat spreader structure on a milling machine, and use milling to process the solid area of ​​the upper cover plate to obtain the fin 51 structure on the cover plate, thereby completing the manufacture of the heat spreader structure with fins 51.

[0083] The present invention improves the structural design and process of the welding between the heat spreader support columns 2, which can improve the heat transfer stability and service life of the heat spreader. The heat of the heat spreader is transferred to the heat spreader through the fins 51 on the top of the cover plate for convective heat exchange, effectively solving the problem of low convective heat exchange efficiency of the heat spreader and improving the convective heat dissipation efficiency of the heat spreader.

[0084] Example 7

[0085] As shown in FIG12 , the difference between the embodiment 7 of the present invention and the embodiment 1 is that the fin 51 for convective heat dissipation of the heat spreader in the embodiment 1 is a solid structure. In the embodiment 7, the fin 51 can be a cavity fin 51 with a steam cavity 6 and a liquid wick, wherein the upper steam cavity 6 of the fin 51 and the lower steam cavity 6 at the bottom of the heat spreader are formed by the liquid wick 4. An internal phase change cycle is performed in the hollow fin of the embodiment 7. After the heat on the bottom surface of the heat spreader evaporates the working medium, the working medium vapor comes to the hollow fin above. The condensation in the steam chamber 6 of the plate turns back into the working fluid liquid, and the working fluid liquid is returned to the cavity below the heat spreader by the liquid absorption core 4 from the upper hollow fin through the pump; at the same time, the working fluid liquid evaporates below the heat spreader, and the working fluid vapor condenses on the liquid absorption core sintered above the heat spreader and in the fin cavity to form liquid working fluid again, and the liquid working fluid is pumped into the cavity below the heat spreader by the liquid absorption core 4. Such a structural design can also effectively solve the problem of low convective heat transfer efficiency of the heat spreader and improve the convective heat dissipation efficiency of the heat spreader.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A finned vapor chamber structure is applied to battery heat dissipation, and is characterized in that, include: A support plate shell, a support column, a liquid injection port, a liquid absorbent core and a fin cover plate, wherein the support columns are arranged in an array in the support plate shell, the liquid injection port is arranged on the outside of the support plate shell and is connected to the support plate shell, the liquid absorbent core surrounds the support column and is arranged in the support plate shell to form a steam chamber for heat exchange, and a welding layer formed on the wall of the liquid absorbent core between adjacent steam chambers for connecting the support plate shell and the fin cover plate is included, and the top end of the fin cover plate includes a plurality of fins arranged in an array, and the fin cover plate is covered and fixed to the top end of the support plate shell and performs convection heat exchange with the outside through the fins.

2. The finned vapor chamber structure according to claim 1, wherein The shape of the support column includes a cylinder, a variable prism or an irregular column.

3. The heat pipe structure with fins according to claim 1, wherein The supporting plate housing is made of metal material or ceramic material, and the metal material includes copper, copper alloy, aluminum, aluminum alloy, copper-aluminum alloy and stainless steel.

4. The finned vapor chamber structure according to claim 3, wherein The liquid absorbent core is arranged on the outside of the support column and the bottom and side wall of the support plate shell through sintering processing, and the sintered thickness of the liquid absorbent core is 0.5mm-1.5mm.

5. The finned vapor chamber structure according to claim 4, wherein The material of the liquid absorbent core is the same metal as the material of the support plate shell, and the structure of the liquid absorbent core includes a mesh liquid absorbent core and a powder liquid absorbent core.

6. The heat pipe structure with fins according to claim 1, characterized in that, The array arrangement of the support columns includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement and an irregular array arrangement.

7. The finned heat pipe structure according to claim 1, wherein The shapes of the fins include triangle, rectangle, square, polygon, circle, spiral, corrugated, sawtooth, needle, longitudinal, plate and irregular shapes.

8. The heat pipe structure with fins according to claim 1, wherein The array arrangement of the fins on the fin cover includes a triangular array arrangement, a circular array arrangement, an elliptical array arrangement, a polygonal array arrangement and an irregular array arrangement.

9. The finned heat pipe structure according to claim 1, wherein The injection port is connected to the injection pipe to inject the working medium into the cavity formed by the support plate shell and the fin cover plate.

10. A manufacturing process of a heat sink structure with fins, comprising the following steps: Step 1: Processing the phase change material into a support plate shell structure by chemical etching and / or mechanical processing, and processing support columns arranged in an array in the support plate shell; Step 2: using a graphite mold to sinter on the support plate shell to form a liquid wick disposed on the outside of the support column and the bottom and side of the support plate shell, so that a steam cavity is formed in the liquid wick; Step 3: preparing a fin cover plate with array-arranged fins, and sintering a liquid-absorbing core at the bottom of the fin cover plate; Step 4: Using diffusion welding process and / or brazing process to weld the support plate shell and the fin cover plate according to the internal structure of the heat spreader to form a heat spreader structure; Step 5: Insert the injection tube into the vapor chamber from the injection port, and fix the injection tube in the injection port by induction welding and / or light-curing resin, and perform a leakage test on the vapor chamber; Step 6: The heat spreader that has passed the leakage test is sequentially subjected to the liquid injection process, freezing process, vacuuming process, pre-pressing and sealing process, secondary degassing process, cold pressing and sealing process, tail removal process and argon arc welding and / or laser welding repair process to complete the manufacture of the heat spreader structure with fins.

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