WO2022027740A1

WO2022027740A1 - Thin vapor chamber

Info

Publication number: WO2022027740A1
Application number: PCT/CN2020/111172
Authority: WO
Inventors: 张于光
Original assignee: 昆山联德电子科技有限公司
Priority date: 2020-08-03
Filing date: 2020-08-26
Publication date: 2022-02-10
Also published as: CN212931119U

Abstract

Disclosed is a thin vapor chamber. An upper cover plate (2) and a lower cover plate (3) are opposite in a face-to-face manner, and a cavity is formed between the upper cover plate and the lower cover plate; a capillary liquid absorption structure (5) is arranged in the cavity and at a side close to the upper cover plate (2), and a working phase-change fluid medium is sealed in the cavity; a plurality of supporting structures (4) and/or capillary supporting composite structures are selectively arranged between the upper cover plate (2) and the lower cover plate (3); the upper cover plate (2) is supported by means of the lower cover plate (3) and/or the supporting structures (4) and/or the capillary supporting composite structures; and a plurality of metal coatings are respectively disposed on the upper cover plate (2), the lower cover plate (3), the capillary liquid absorption structure (5), the supporting structures (4) and the capillary supporting composite structures. The vapor chamber has the functions of absorbing and storing various gases which include hydrogen and which cannot be condensed at a temperature of 0ºC or higher, the performance and the manufacturing yield of the vapor chamber are effectively improved, the excellent heat conduction performance of the vapor chamber is maintained for a long time, and the vapor chamber can withstand a long-time aging test.

Description

A thin uniform temperature plate

technical field

The utility model belongs to the technical field of temperature uniformity plates, in particular to a thin temperature uniformity plate.

Background technique

With the continuous upgrading of functions and appearances of mobile computers, tablet computers, mobile phones, and wearable devices, the requirements for power consumption and thinning experience are also increasing. Vapor chambers have gradually replaced traditional heat sinks. The vapor chamber has the ability of rapid surface heat conduction and high-density heat conduction, and has the characteristics of lightness and thinness. At present, there are still the following shortcomings in the production and use of the uniform temperature plate:

1. In the manufacture of the uniform temperature plate, the vacuum chamber is not cleanly degassed. In addition to the condensable phase change medium above 0 ℃, the residual gas including hydrogen cannot be condensed above 0 ℃, resulting in performance degradation or failure. Iron or iron alloy undergoes electrochemical corrosion reaction in the presence of medium water or water vapor, and redox releases iron oxide and hydrogen (hydrogen evolution reaction), even if iron or iron alloy has better anti-corrosion and anti-oxidation treatment A slower hydrogen evolution reaction will still occur, and the reaction will speed up as the temperature increases;

2. After the vapor chamber is manufactured, chemical or electrochemical reactions will occur continuously due to the heat pipe or vapor chamber metal shell material or internal metal capillary structure material and the working phase change fluid medium in the vacuum chamber during the whole period of its life. Produce a variety of gases, including hydrogen, that cannot be condensed at temperatures above 0 °C, resulting in performance degradation or failure;

3. Substances added in the manufacture of vapor chambers that absorb various gases, including hydrogen, that cannot be condensed at temperatures above 0 °C are common and need to be placed separately, occupying the space inside the heat pipe or vapor chamber, and limiting further reductions in the heat pipe or vapor chamber. The possibility of small thickness, and increase the waste of process steps;

4. At present, the vaporizing plate products with hydrogen absorbing function are all placed in the cavity with an independent hydrogen absorbing device, which occupies the heat conduction space of the vaporizing plate, and is easy to form a blind area of uniform temperature. The position of the hydrogen absorbing device has a large temperature difference and is limited In view of the possibility that the thickness of the vapor chamber will continue to decrease, it is difficult to achieve a thickness of 0.3mm, which becomes the bottleneck of the structural design of ultra-thin products; and additional placement and fixing operations are required in the production and manufacturing, and the processing efficiency and cost are both high for consumer products. Great constraints on production capacity and cost.

Therefore, it is of great practical significance to study a new type of vapor chamber to remove a variety of gases including hydrogen that cannot be condensed above 0 °C.

Utility model content

In order to solve the technical problems existing in the prior art, the purpose of the present utility model is to provide a thin temperature equalizing plate, which can effectively remove a variety of condensed gases that cannot be above 0°C, including hydrogen, in the chamber of the temperature equalizing plate, Improve and maintain the good low temperature difference uniform temperature performance of the vapor chamber.

In order to achieve the above-mentioned purpose and achieve the above-mentioned technical effect, the technical scheme adopted by the present utility model is:

A thin temperature equalizing plate, comprising an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are opposite to each other and a cavity is formed between them, and a capillary is arranged in the cavity and on the side close to the upper cover plate Liquid suction structure, a working phase change fluid medium is enclosed in the cavity, a plurality of supporting structures and/or capillary supporting composite structures are selectively arranged between the upper cover plate and the lower cover plate, and the lower cover plate and/or the support structure and/or The capillary support composite structure supports the upper cover plate, and several metal plating layers are respectively arranged on the upper cover plate, the lower cover plate, the capillary liquid absorption structure, the support structure and the capillary support composite structure.

Further, the front and back sides of the upper cover plate, the lower cover plate, the capillary liquid absorption structure, the support structure and the capillary support composite structure, the front side or the back side faces all of the one side inside the cavity, and the front side or the back side faces the inside of the cavity. A number of layers of metal plating layers are respectively provided on one side.

Further, two metal plating layers are respectively provided on the upper cover plate, the lower cover plate, the capillary liquid absorption structure, the support structure and the capillary support composite structure.

Further, the thickness of the first metal plating layer is 1 μm˜50 μm, and the thickness of the second metal plating layer is 0.01 μm˜10 μm.

Further, the cavity between the upper cover plate and the lower cover plate is filled with gas adsorption particles with a particle size of 5um to 500um.

Further, the lower cover is in a concave-convex structure, the capillary liquid absorption structure is connected with the concave portion on the top of the lower cover, and the upper cover and the bottom convex portion of the lower cover are face-to-face and form several cavities.

Further, both the support structure and the capillary support composite structure are in the form of a network, and the capillary support composite structure is coated with copper powder.

Further, the capillary liquid-absorbing structure is a network capillary network formed by weaving.

Further, a seal is provided in the middle of one side of the temperature equalizing plate, and a working phase change fluid medium is injected into the cavity through the seal.

Further, the metal plating layer adopts any one of titanium-based substances, calcium-based substances, palladium-based substances, vanadium-based substances, and platinum-based substances.

Compared with the prior art, the beneficial effects of the present utility model are:

1. It greatly breaks through the manufacturing limit of the thickness of the existing thin vapor chambers. The vapor chambers in the 0.18mm test fully meet the conventional test requirements for thin vapor chambers. In theory, the application is applicable to the vapor chambers ≥ 0.1mm;

2. A cavity is formed between the upper cover and the lower cover, and several support structures and/or capillary support composite structures are selectively arranged between the upper cover and the lower cover. Or the capillary support composite structure supports the upper cover plate, and the liquid fluid medium flows along the capillary liquid absorption structure by the surface tension tensile stress of the material, with strong capillary ability and high structural stability;

3. The upper cover, the lower cover, the support structure, the capillary liquid absorption structure and the capillary support composite structure are given the function of absorbing and storing various gases that cannot be condensed above 0°C, including hydrogen, which greatly simplifies the temperature uniformity plate. The assembly and manufacturing process is convenient for automated production and manufacturing, which improves efficiency and reduces manufacturing costs;

4. It can effectively remove a variety of condensed gases, including hydrogen, which cannot be above 0 °C in the cavity of the temperature chamber, improve and maintain the good low temperature difference average temperature performance of the temperature chamber, and can absorb and store within 400°C. Hydrogen and other small molecular gases retain the working phase change fluid medium in the cavity and make the only component ratio in the cavity higher, so as to achieve the purpose of improving and maintaining the temperature uniformity of the temperature chamber;

5. It can effectively improve the performance and manufacturing yield of the uniform temperature plate, and maintain the excellent thermal conductivity of the uniform temperature plate for a long time. It can withstand a long time of aging test. It has wide application prospects and low process difficulty. Components, vehicle power systems, batteries and other products and industries are of great practical value.

Description of drawings

Fig. 1 is the front view of the uniform temperature plate of Embodiment 1 of the present utility model;

Fig. 2 is A-A sectional view in Fig. 1 of the utility model;

Fig. 3 is the partial enlarged view of I in Fig. 2 of the utility model;

Fig. 4 is the structural representation of the capillary liquid absorbing structure of the present invention;

5-7 are the schematic structural diagrams of the temperature equalizing plate in Embodiment 2 of the present utility model respectively;

Fig. 8 is A-A sectional view in Fig. 7 of the utility model;

9-10 are respectively the structural schematic diagrams of the temperature equalizing plate in Embodiment 3 of the present invention;

Fig. 11 is A-A sectional view in Fig. 10 of the utility model;

Fig. 12 is the temperature difference curve diagram of the aging test after the soaking plate of the utility model is coated;

FIG. 13 is a temperature difference curve diagram of the aging test of the uncoated layer of the vapor chamber of the present invention.

detailed description

The embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, and the protection scope of the present utility model can be more clearly defined.

As shown in Figure 1-13, a thin-type temperature equalizing plate has a seal 1 on one side of the uniform temperature plate. The temperature equalizing plate includes an upper cover plate 2 and a lower cover plate 3, and the upper cover plate 2 and the lower cover plate 3 are face-to-face. And a cavity is formed between the two. Specifically, the upper cover plate 2 and the lower cover plate 3 are in contact with the head and tail surfaces and form a cavity in the middle position. The side of the cavity close to the upper cover plate 2 is provided with capillary suction. Liquid structure 5, the working phase change fluid medium is injected into the cavity through the seal 1 and vacuumed for sealing. The working phase change fluid medium changes from a liquid fluid medium to a gaseous fluid medium after being heated at the heat source, and moves to the non-gaseous fluid medium by the expansion force. The heat source condenses and changes back to the liquid fluid medium and releases heat at the same time, and the liquid fluid medium flows back to the heat source along the capillary liquid absorbing structure 5 by the tensile stress of the surface tension of the material, and several supports are selectively arranged between the upper cover plate 2 and the lower cover plate 3 The structure 4 and several capillary support composite structures support the upper cover plate 2 through the lower cover plate 3 and/or the support structure 4 and/or the capillary support composite structure, and the lower cover plate 3, the support structure 4 and the capillary support composite structure can be selected. One or several combinations of supporting the upper cover plate 2, the support structure 4 and the capillary support composite structure can be alternately arranged or not simultaneously arranged between the upper cover plate 2 and the lower cover plate 3, the support structure 4 and the capillary support composite structure Both are in the form of a network and have the same structure. The capillary support composite structure can be obtained by coating copper powder on the support structure 4. The lower cover plate 3 can be designed into a concave-convex structure or other structures to improve the support capacity, as shown in Figure 8. It is only necessary to ensure that there is a cavity between the lower cover 3 and the upper cover 2, and that the shape and structure of the upper cover 2, the lower cover 3, the support structure 4, the capillary suction structure 5 and the capillary support composite structure are all the same. Adaptation, the upper cover plate 2, the lower cover plate 3, the support structure 4, the capillary liquid absorption structure 5 and the capillary support composite structure are respectively provided for absorbing, storing and removing several kinds of hydrogen, including hydrogen, which cannot be condensed above 0 °C. For several layers of metal coating of the gas, the thickness of the first metal coating is 1 μm to 50 μm, the thickness of the second metal coating is 0.01 μm to 10 μm, and the thickness of the Nth metal coating can be decreased according to actual needs.

The present invention does not limit the position of the metal coating on the surface of the upper cover plate 2, the lower cover plate 3, the support structure 4, the capillary liquid absorption structure 5 and the capillary support composite structure. Cover plate 3, support structure 4, capillary absorbent structure 5, all of the front and back sides of the capillary support composite structure, the front or back facing all of one of the sides of the cavity, or the front or back facing one of the sides of the cavity. Parts, including edges, corners, middle parts or multiple parts, can also disperse gas adsorption particles with a particle size of 5 μm to 500 μm in the cavity to remove the gas in the cavity.

The temperature equalizing plate is made of one or more of copper, copper alloy, iron, stainless steel of various grades, titanium, titanium alloy, aluminum, aluminum alloy, magnesium, magnesium alloy nickel, nickel alloy, tin, and tin alloy.

The metal plating layer is made of a composite material alloy in which one or more of titanium-based substances, calcium-based substances, palladium-based substances, vanadium-based substances, and platinum-based substances are combined.

The capillary liquid-absorbing structure 5 is a network capillary network formed by weaving, or a network capillary network structure composed of powder sintering or weaving and powder sintering. There are several circular dimple structures on it, and the capillary capacity is high.

The temperature difference curves of the aging test before and after the coating are shown in Figures 12-13. The experimental results show that the metal coating improves the anti-aging performance of the vapor chamber of the present invention.

The utility model effectively removes a variety of condensed gases, including hydrogen, which cannot be above 0°C in the cavity of the temperature chamber, and improves and maintains the good low temperature difference average temperature and thermal conductivity of the temperature chamber; the temperature is within 400°C Absorb and store small molecular gases such as hydrogen, retain the working phase change fluid medium in the cavity and make the unique component ratio in the cavity higher, so as to achieve the purpose of improving and maintaining the uniform temperature performance of the vapor chamber; it can make a great breakthrough The manufacturing limit of the thickness of the thin vapor chamber is currently at 0.18mm, which fully meets the conventional test requirements for thin vapor chambers. In theory, all chambers with a thickness of ≥ 0.1mm are applicable to the utility model; the manufacturing process of vapor chamber assembly is greatly simplified, and the automation is facilitated. Manufacturing, improves efficiency and reduces manufacturing costs; it can effectively improve the performance and manufacturing yield of the vapor chamber, maintain the excellent thermal conductivity of the vapor chamber for a long time, and can withstand long-term aging tests. It has a wide range of application prospects. It has low technological difficulty and is of great practical value in electronic products, electronic components, vehicle power systems, batteries and other products and industries.

Example 1

As shown in Figure 1-4, a thin temperature uniform plate has a seal 1 on one side of the uniform temperature plate. The uniform temperature plate includes an upper cover plate 2 and a lower cover plate 3. The head and tail surfaces of the upper cover plate 2 and the lower cover plate 3 The surfaces are connected to each other and an internal cavity is formed in the middle position. In the cavity, a capillary liquid absorbing structure 5 is arranged on the side close to the upper cover plate 2. The sealing 1 injects the working phase change fluid medium into the cavity and vacuumizes the sealing. Several supporting structures 4 are arranged in parallel between the upper cover 2 and the lower cover 3. At this time, there is no need to set up a capillary support composite structure. The plate 3 and the support structure 4 support the upper cover plate 2, and the support structure 4 is a network structure formed by weaving or powder sintering or weaving and powder sintering. As shown in FIG. 3, the upper cover plate 2, the lower cover plate 3, the support Structure 4 and capillary liquid absorbing structure 5 are respectively provided with two layers of metal coatings for absorbing, storing and removing several kinds of gases including hydrogen that cannot be condensed above 0°C. The thickness of the first metal coating is 10 μm, and the thickness of the second metal coating is The thickness of the metal plating layer is 5 μm.

Example 2

As shown in Figure 5-8, a thin temperature uniform plate has a seal 1 on one side of the uniform temperature plate. The uniform temperature plate includes an upper cover plate 2 and a lower cover plate 3. The head and tail surfaces of the upper cover plate 2 and the lower cover plate 3 The surfaces are connected to each other and an internal cavity is formed in the middle position. In the cavity, a capillary liquid suction structure 5 is arranged on the side close to the upper cover plate 2, and the working phase change fluid medium is injected into the cavity through the sealing 1, and the sealing is performed by vacuuming. The difference between the second embodiment and the first embodiment is that the support structure 4 and the capillary support composite structure can be selectively arranged or not arranged between the upper cover plate 2 and the lower cover plate 3 of the second embodiment. 3 is designed as a concave-convex structure to improve the support capacity, as shown in Figure 8, at this time, one side of the capillary liquid absorbing structure 5 is connected to the upper cover plate 2, and the other side of the capillary liquid absorbing structure 5 is connected to the top recess of the concave-convex structure of the lower cover plate 3. Connection, a cavity is formed between the bottom protrusion of the concave-convex structure of the lower cover plate 3 and the upper cover plate 2, and the upper cover plate 2, the lower cover plate 3, and the capillary liquid absorbing structure 5 are respectively provided for absorbing, storing and removing. For several two-layer metal coatings that cannot condense gas at temperatures above 0°C, including hydrogen, the thickness of the first metal coating is 10 μm, and the thickness of the second metal coating is 5 μm.

The same as in Example 1.

Example 3

The difference between the second embodiment and the first embodiment is that the support structure 4 and the capillary support composite structure can be selectively arranged or not arranged between the upper cover plate 2 and the lower cover plate 3 of the second embodiment. Several circular or other arbitrary-shaped structures arranged in a row are arranged on the inner wall to improve the supporting capacity. At this time, there is still a cavity between the upper cover plate 2 and the lower cover plate 3, as shown in Figure 9-11.

The parts of the present invention that are not described in detail can be realized by using the prior art, and will not be repeated here.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other Relevant technical fields are similarly included in the scope of patent protection of the present invention.

Claims

A thin temperature equalizing plate is characterized in that it includes an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are opposite to each other and a cavity is formed between the two, in the cavity, close to the upper cover plate A capillary liquid absorbing structure is arranged on one side, a working phase change fluid medium is enclosed in the cavity, and several supporting structures and/or capillary supporting composite structures are selectively arranged between the upper cover and the lower cover. The structure and/or the capillary support composite structure supports the upper cover plate, and several metal plating layers are respectively arranged on the upper cover plate, the lower cover plate, the capillary liquid absorption structure, the support structure and the capillary support composite structure.
The thin uniform temperature plate according to claim 1, wherein the front and back sides, the front side or the back side of the upper cover plate, the lower cover plate, the capillary liquid absorbing structure, the support structure and the capillary support composite structure are empty. Several layers of metal plating layers are respectively provided on the part of one side of the interior of the cavity, the front side or the back side facing one side of the interior of the cavity.
A thin temperature equalizing plate according to claim 1 or 2, characterized in that, two metal plating layers are respectively provided on the upper cover plate, the lower cover plate, the capillary liquid absorption structure, the support structure and the capillary support composite structure.
The thin vapor chamber according to claim 3, wherein the thickness of the first metal plating layer is 1 μm-50 μm, and the thickness of the second metal plating layer is 0.01 μm-10 μm.
The thin uniform temperature plate according to claim 1, wherein the cavity between the upper cover plate and the lower cover plate is filled with gas adsorption particles with a particle size of 5 μm to 500 μm.
The thin temperature equalizing plate according to claim 1, wherein the lower cover plate is in a concave-convex structure, the capillary liquid absorption structure is connected to the concave part at the top of the lower cover plate, and the upper cover plate is connected to the bottom of the lower cover plate. The protruding parts face each other and form several cavities.
The thin vapor chamber according to claim 1, wherein the support structure and the capillary support composite structure are in a network shape, and the capillary support composite structure is coated with copper powder.
The thin uniform temperature plate according to claim 1, wherein the capillary liquid absorbing structure is a network capillary net formed by weaving.
The thin temperature equalizing plate according to claim 1, wherein a seal is provided in the middle of one side of the temperature equalizing plate, and a working phase change fluid medium is injected into the cavity through the seal.