Anti-expansion vapor chamber
By designing an anti-expansion structure and a dual-cavity design on the heat-smooth plate, the problem of expansion of the ultra-thin heat-smooth plate in vacuum or high-temperature environments is solved, and its anti-expansion performance and heat transfer efficiency in battery cooling applications are improved, and it is suitable for extreme environments.
Patent Information
- Application Number
- CN202323253911.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2033-11-30
AI Technical Summary
Ultra-thin heat-scaling plates expand rapidly in vacuum or high-temperature environments due to air pressure difference, affecting their application in battery motors and aerospace fields.
An anti-expansion heat homogenization plate is designed, including an upper shell plate, a first liquid absorbent core, a lower shell plate, a second liquid absorbent core and a phase change working fluid. The anti-expansion performance is improved through multiple support columns and welding edge structures, and uniform heat transfer is achieved through a dual inner cavity design.
It improves the anti-expanded structural strength and fatigue strength of the heat-efficient plate in battery heat dissipation applications, ensures heat transfer stability and service life, and is suitable for extreme environments such as vacuum and high temperatures, especially in the fields of aerospace and battery motors.
Smart Images
Figure CN222579019U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery heat dissipation, and in particular to an anti-expansion heat spreader. Background Art
[0002] The battery car and power energy storage industries are developing rapidly. In order to ensure that the battery system can maintain better operating conditions and relatively longer service life in various environments, battery temperature control is particularly important.
[0003] As a phase change device with high heat transfer and fast startup characteristics, the vapor chamber has been applied in various industries. In particular, the advent of ultra-thin and miniaturized vapor chambers in recent years has opened up new channels for more diversified applications of vapor chambers. However, as the vapor chamber becomes thinner, its structural strength problem has also begun to become the focus of attention.
[0004] Ultra-thin vapor chambers expand rapidly in a vacuum or high-temperature environment due to the difference in internal and external pressures, which seriously affects the assembly and application of ultra-thin vapor chambers in many fields. For example, in the field of batteries and motors, the vapor chamber needs to undergo vacuum and high-temperature packaging during the assembly process. Similarly, in aerospace applications, absolute vacuum often puts the vapor chamber at risk of direct failure.
[0005] Therefore, how to ensure that the heat spreader can still maintain its structural anti-expansion strength during the ultra-thinning process is an issue that needs to be urgently addressed. Utility Model Content
[0006] In view of the deficiencies in the prior art, the utility model proposes an anti-expansion vapor chamber, which can overcome the problem of insufficient anti-expansion performance of the vapor chamber in battery heat dissipation.
[0007] The utility model provides an anti-expansion soaking plate, comprising an upper shell plate, a first liquid wick, a lower shell plate, a second liquid wick and a working medium, wherein the upper shell plate and the lower shell plate are connected, and the upper shell plate and the lower shell plate are both provided with grooves for forming an upper inner cavity and a lower inner cavity;
[0008] A plurality of first support columns are distributed in the groove of the upper shell plate, and a plurality of through holes corresponding to the first support columns are distributed on the first absorbent core, so that the first support columns pass through the through holes to install the first absorbent core in the upper inner cavity of the upper shell plate;
[0009] A plurality of second support columns matched with the first support columns are distributed in the groove of the lower shell plate, and a plurality of through holes corresponding to the second support columns are distributed on the second absorbent core, so that the two support columns pass through the through holes to install the second absorbent core in the lower inner cavity of the lower shell plate;
[0010] The working medium is a phase-change liquid flowing in the groove, which disperses the heat of the upper shell plate and the lower shell plate to the heat diffusion plate.
[0011] The preferred technical solution of the utility model is that welding edges and injection sections are distributed around the first support column and the second support column, and the height of the welding edges and the injection section is the same as the height of the adjacent support columns.
[0012] An optimal technical solution of the utility model is that the liquid absorbing core and the shell plate are made of phase change metal material or ceramic material.
[0013] The preferred technical solution of the present invention is that the first support column and the second support column are cylindrical, polygonal prism-shaped and irregular prism-shaped.
[0014] A preferred technical solution of the utility model is that the liquid absorbent core is a sheet-like wire mesh structure, including at least one layer of metal wire mesh.
[0015] The preferred technical solution of the utility model is that the thickness of the wick is not higher than the height of the support column, the inner diameter of the through hole is not less than the maximum outer diameter of the support column, and the shape of the through hole is compatible with the cross-sectional shape of the support column passing through the through hole.
[0016] The preferred technical solution of the utility model is that a capillary structure for enhancing the liquid absorption performance is arranged on the liquid absorbent core.
[0017] An optimal technical solution of the utility model is that the thickness of the heat spreader formed by the upper shell plate and the lower shell plate is not higher than 1 mm.
[0018] A preferred technical solution of the utility model is that, in one embodiment of the utility model, the first support columns and the second support columns are arranged in an array in the grooves of the upper shell plate and the lower shell plate respectively.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] (1) The utility model improves the structural design and process of the welding between the support columns of the heat spreader, which can improve the structural strength and fatigue strength of the heat spreader in the battery heat dissipation application scenario, and effectively ensure its heat transfer stability and service life.
[0021] (2) The utility model can be applied to various extreme environments including vacuum environments and high-temperature environments, and has better process adaptability and usage stability, especially for scenarios such as aerospace fields and battery motors.
[0022] (3) The utility model distributes heat evenly to various positions of the heat spreader through two inner cavities filled with phase change fluids, and can meet the heat dissipation requirements in different heat dissipation scenarios. The double inner cavity design transfers heat evenly to the shell plate through the liquid channel of the wick and the air channel of the inner cavity to achieve high-efficiency heat dissipation.
[0023] (4) The utility model ensures the ultra-thinness of the heat spreader while improving the anti-expansion performance of the heat spreader. It can be applied to most application scenarios that have requirements for the thickness of the heat spreader, expand the application scope of the heat spreader, and improve the practicality of the heat spreader. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the implementation methods of the present utility or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present utility. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0025] Figure 1 This is a three-dimensional exploded view of an anti-expansion soaking plate of the utility model;
[0026] Figure 2 It is a schematic diagram of an upper shell plate in an anti-expansion soaking plate of the utility model;
[0027] Figure 3 This is a cross-sectional view of an anti-expansion vapor chamber according to the present invention.
[0028] Figure identification: 1-upper shell plate, 2-lower shell plate, 3-first liquid absorbent core, 4-second liquid absorbent core, 5-first support column, 6-second support column, 7-woven belt. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] See also Figures 1 to 3 As shown, the embodiment of the utility model provides an anti-expansion heat soaking plate, comprising: an upper shell plate 1, a first liquid absorbent core 3, a lower shell plate 2, a second liquid absorbent core 4 and a working medium, wherein the upper shell plate 1 and the lower shell plate 2 are connected, and the upper shell plate 1 and the lower shell plate 2 are both provided with grooves for forming an upper inner cavity and a lower inner cavity;
[0033] It should be noted that compared to the heat spreader used in the field of chip heat dissipation, which needs to be laid above the chip as the heat source, the chip heat can be evenly transferred to the shell plate of the heat spreader through an inner cavity that can circulate phase change working fluid to release heat, and the thickness of the heat spreader itself does not affect the chip heat dissipation performance, especially in the high-temperature chip heat dissipation scenario in military scenarios. The core is the anti-expansion performance problem, without considering the ultra-thinness of the heat spreader. In this application, the anti-expansion heat spreader is used in the field of battery heat dissipation. In addition to the improvement of anti-expansion performance, it is also necessary to consider the ultra-thinness of the heat spreader so that it can be installed between batteries. Therefore, the design of two inner cavities can ensure that the heat spreader is ultra-thin and a full range of heat absorption and heat release processes can be achieved. At the same time, while retaining the liquid and air channel structures of the heat spreader, the support columns are welded by welding methods such as diffusion welding, single-point brazing, reflow soldering, etc., to ensure that the processed heat spreader has high anti-expansion performance.
[0034] In one embodiment of the present invention, the thickness of the heat spreader formed by the upper shell plate 1 and the lower shell plate 2 is not higher than 1 mm.
[0035] It should be noted that in the field of battery heat dissipation, the phase change working fluid absorbs the battery heat and then releases the heat through the heat spreader shell and the condensation end. The heat spreader needs to be installed between adjacent batteries, and its thickness will affect the heat dissipation efficiency. If the heat spreader's anti-expansion performance is insufficient, the heat spreader will also expand and rapid heat transfer cannot be achieved. Therefore, ultra-thin heat spreaders can effectively dissipate heat when facing battery heat dissipation, and the thinner the thickness, the higher the heat dissipation efficiency.
[0036] A plurality of first support columns 5 are distributed in the groove of the upper shell plate 1, and a plurality of through holes corresponding to the first support columns 5 are distributed on the first absorbent core 3, so that the first support columns 5 pass through the through holes to install the first absorbent core 3 in the upper inner cavity of the upper shell plate 1;
[0037] In one embodiment of the present utility model, welding edges and injection sections are distributed around the first support column 5 and the second support column 6, and the height of the welding edges and the injection section is the same as the height of the adjacent support columns.
[0038] In an embodiment of the present invention, the first support column 5 and the second support column 6 are cylindrical, polygonal prism-shaped, or irregular prism-shaped.
[0039] It should be noted that, as known to those skilled in the art, in actual production, the cross-sectional shapes of the support columns and through holes can be adjusted according to actual application requirements, as long as the installation requirements for the wick and the welding of the upper and lower shell plates are met, as long as heat transfer through the liquid channels and air channels in the inner cavity of the heat spreader can be achieved.
[0040] A plurality of second support columns 6 matching the first support columns 5 are distributed in the groove of the lower shell plate 2, and a plurality of through holes corresponding to the second support columns 6 are distributed on the second absorbent core 4, so that the two support columns pass through the through holes to install the second absorbent core 4 in the lower inner cavity of the lower shell plate 2;
[0041] In one embodiment of the present invention, the first support columns 5 and the second support columns 6 are arranged in an array in the grooves of the upper shell plate 1 and the lower shell plate 2, respectively.
[0042] Further, such as Figure 3 As shown, when designing the support column and the wick, the maximum outer diameter D of the support column needs to be larger than the inner diameter of the through hole of the wick. Preferably, the design of the support column being narrow at the top and wide at the bottom can effectively increase the volume of the inner cavity air duct and achieve faster heat dissipation.
[0043] Furthermore, it is known to those skilled in the art that when designing the arrangement of the support columns, it is sufficient to ensure that the root outer diameter, top inner diameter, shape, position, and number of the support columns in the grooves of the upper and lower shell plates are one-to-one corresponding. The arrangement can be adjusted according to actual needs, and the sizes of the support columns can also be different (for example, the length of the first support column can be different from the length of the second support column, then the thickness of the upper shell plate and the thickness of the lower shell plate need to be adjusted to ensure that the length of the support column is adapted to the thickness of the shell plate), as long as the welding surface diameters of the first support column and the second support column are the same.
[0044] The working medium is a phase-change liquid flowing in the groove, which disperses the heat of the upper shell plate 1 and the lower shell plate 2 to the heat spreader.
[0045] It should be noted that the working fluid can be a liquid substance with phase change heat transfer performance, which can achieve the effect of rapid heat dissipation of the heat spreader. Those skilled in the art will easily know that anhydrous ethanol, acetone, ionized water, and methanol can all be used as working fluids.
[0046] In one embodiment of the utility model, the liquid wick and the shell plate are made of phase change metal material or ceramic material.
[0047] It should be noted that the material of the shell plate is a metal material with phase change heat transfer performance such as copper, stainless steel, aluminum, etc. or a ceramic material, among which copper is the preferred material. Similarly, the wick can also be a metal material with phase change heat transfer performance such as copper, stainless steel, aluminum, etc., among which copper is the preferred material.
[0048] In one embodiment of the present invention, the absorbent core is a sheet-like wire mesh structure, including at least one layer of metal wire mesh.
[0049] In one embodiment of the utility model, the thickness of the wick is not higher than the height of the support column, the inner diameter of the through hole is not less than the maximum outer diameter of the support column, and the shape of the through hole is compatible with the cross-sectional shape of the support column passing through the through hole.
[0050] In one embodiment of the utility model, a capillary structure for enhancing the liquid absorption performance is arranged on the liquid absorbent core.
[0051] It should be noted that the liquid wick can be a multi-layer screen such as a copper screen sintered, the screen mesh number is not less than 250 meshes, the thickness is 0.01-0.04mm, and the screen layer number is 1-10 layers, such as Figure 2 As shown, under the premise that the original capillary structure of the absorbent core can effectively absorb the working fluid, adding a capillary structure (such as a woven mesh, the woven mesh material is preferably copper) that can enhance the absorbent performance on the surface of the wire mesh can further increase the overall absorbent performance of the absorbent core and improve the heat dissipation efficiency.
[0052] Furthermore, when the anti-expansion heat spreader is working, it is placed between adjacent batteries. The phase change medium passing through the two inner cavities from two directions is heated and vaporized, and the heat is released through the condensation end. The phase change medium circulates back and forth along the liquid channels in the upper and lower inner cavities of the upper and lower shell plates, and at the same time cooperates with the air channels between the support columns and the adjacent liquid wicks to complete phase change cooling, reduce the battery temperature, and prevent the heat spreader from expanding.
[0053] The utility model improves the structure design and process of the welding between the support columns of the heat spreader, which can improve the anti-expansion structural strength and fatigue strength of the heat spreader in the battery heat dissipation application scenario, and effectively ensure its heat transfer stability and service life. The heat is evenly distributed to various positions of the heat spreader through two inner cavities filled with phase change working fluids, and the heat dissipation requirements can be met in different heat dissipation scenarios. The heat is evenly transferred to the shell plate through the liquid channel of the wick and the air channel of the inner cavity through the double inner cavity design to achieve efficient heat dissipation. The ultra-thinness of the heat spreader is ensured while improving the anti-expansion performance of the heat spreader, which can be applied to most application scenarios that require the thickness of the heat spreader, increase the scope of application of the heat spreader, and improve the practicality of the heat spreader. It can be applied to various extreme environments including vacuum environments and high temperature environments, especially for aerospace fields, battery motors and other scenarios, which have better process adaptability and use stability.
[0054] The above description is only a preferred implementation mode 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 shall be included in the protection scope of the present invention.
Claims
1. An anti-expansion vapor chamber, used for battery heat dissipation, characterized in that: include: An upper shell plate (1), a first liquid absorbent core (3), a lower shell plate (2), a second liquid absorbent core (4), and a working medium, wherein the upper shell plate (1) and the lower shell plate (2) are connected, and the upper shell plate (1) and the lower shell plate (2) are both provided with grooves for forming an upper inner cavity and a lower inner cavity; A plurality of first support columns (5) are distributed in the groove of the upper shell plate (1), and a plurality of through holes corresponding to the first support columns (5) are distributed on the first absorbent core (3), so that the first support columns (5) pass through the through holes to install the first absorbent core (3) in the upper inner cavity of the upper shell plate (1); A plurality of second support columns (6) matched with the first support columns (5) are distributed in the groove of the lower shell plate (2), and a plurality of through holes corresponding to the second support columns (6) are distributed on the second absorbent core (4), so that the two support columns (6) pass through the through holes to install the second absorbent core (4) in the lower inner cavity of the lower shell plate (2); The working medium is a phase-change liquid flowing in the groove, dispersing the heat of the upper shell plate (1) and the lower shell plate (2) to the heat diffusion plate.
2. The anti-expansion vapor chamber according to claim 1, characterized in that: Welding edges and liquid injection sections are distributed around the first supporting column (5) and the second supporting column (6), and the heights of the welding edges and the liquid injection sections are the same as the heights of adjacent supporting columns.
3. The anti-expansion vapor chamber according to claim 1, characterized in that: The liquid absorbing core and the shell plate are made of phase change metal material or ceramic material.
4. The anti-expansion vapor chamber according to claim 3, characterized in that: The first support column (5) and the second support column (6) are cylindrical, polygonal prism-shaped, and irregular prism-shaped.
5. The anti-expansion vapor chamber according to claim 1, characterized in that: The liquid absorbing core is a sheet-like wire mesh structure, comprising at least one layer of metal wire mesh.
6. The anti-expansion vapor chamber according to claim 1, characterized in that: The thickness of the wick is not higher than the height of the support column, the inner diameter of the through hole is not less than the maximum outer diameter of the support column, and the shape of the through hole is compatible with the cross-sectional shape of the support column passing through the through hole.
7. The anti-expansion vapor chamber according to claim 1, characterized in that: The liquid absorbent core is provided with a capillary structure for enhancing the liquid absorption performance.
8. The anti-expansion vapor chamber according to claim 1, characterized in that: The thickness of the heat spreader formed by the upper shell plate (1) and the lower shell plate (2) is no greater than 1 mm.
9. The anti-expansion vapor chamber according to claim 1, characterized in that: The first support columns (5) and the second support columns (6) are arranged in an array in the grooves of the upper shell plate (1) and the lower shell plate (2), respectively.