Hydrogel radiator

Abstract

The utility model belongs to the technical field of radiators, and discloses a hydrogel radiator which comprises a heat conduction base body and a phase change hydrogel unit fixed on the heat conduction base body. Each phase-change hydrogel unit comprises a breathable film with breathable and waterproof functions and a plurality of phase-change hydrogel blocks; the plurality of phase change hydrogel blocks are encapsulated in a closed space; at least one part of the closed space is formed by a breathable film; the phase-change hydrogel block is in heat-conducting connection with the heat-conducting substrate; a gap exists between every two adjacent phase change hydrogel blocks; according to the hydrogel radiator, the multiple phase change hydrogel blocks are adopted, and the gaps are formed between the adjacent phase change hydrogel blocks, so that the radiating effect can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of radiator, especially to a hydrogel radiator. BACKGROUND

[0002] With the rapid development of modern industry, national defense and science and technology, the heat conduction and heat dissipation problem has become the key to restrict the development of many fields. In the field of microelectronics and communication technology, new energy and energy storage, high frequency, high speed and large scale integrated circuit density and miniaturization, the heat generation of unit volume electronic device increases rapidly. At present, the heat generation of microelectronic chip is generally 60~90W·cm －2 , and the highest can reach 200W·cm －2 or above. Therefore, the heat dissipation technology of electronic device becomes more and more the key in new product research and development, and the heat dissipation performance directly affects the working performance of electronic product, because the temperature is too high, which can endanger the junction and solder joint of semiconductor, damage the circuit connection interface and increase the resistance of conductor.

[0003] The relevant research results show that if the temperature of electronic component is reduced by 1℃ than the normal working temperature, the failure rate can be reduced by 4%, and if the temperature increases by 10~20℃, the failure rate will increase by 100%. Generally, the surface temperature of microelectronic chip must be maintained at a low temperature (such as silicon electronic device should be less than 100℃), so that it can work stably with high performance. In addition, many electronic devices need to work normally at an environmental temperature of 40~60℃, which puts forward higher and higher requirements for heat transfer and heat conduction materials as an important part of heat control, so it is urgent to develop heat transfer materials and components with high heat transfer performance, high specific heat capacity, light weight and simple structure.

[0004] The phase change hydrogel is a kind of three-dimensional network structure gel with extremely high hydrophilicity, which can swell rapidly in water and maintain a large volume of water in the swelling state without dissolving. Due to the existence of crosslinked network, the hydrogel can swell and contain a large amount of water. The water content in the hydrogel can be as low as a few percent, or as high as 99%. The aggregate state of the gel is neither a complete solid nor a complete liquid. The behavior of solid is to maintain a certain shape and volume under certain conditions, and the behavior of liquid is that the solute can diffuse or permeate from the hydrogel.

[0005] The liquid-vapor phase change of water has very large latent heat of evaporation (2.20x10 3 J / Kg~2.45x10 3 J / Kg), which can absorb a large amount of heat in the process of changing from liquid to gas, and release a large amount of heat in the process of condensing from gas to liquid. The heat absorption of the phase change heat dissipation structure of hydrogel makes the water in the hydrogel change phase and vaporize into water vapor, and the water vapor transmits heat to the outside of the heat dissipation element through the air permeable hole, so as to realize the effect of heat dissipation and cooling.

[0006] The application of phase change gel in heat dissipation has been relatively mature, and the following technical solutions can be seen:

[0007] CN113741095A, heat dissipation gel body, heat dissipation device, light source module and display panel, which uses gel content and porous film coated on the surface of the gel content to dissipate heat from the back substrate of the light emitting element.

[0008] In the prior art, people tend to make the heat dissipation gel body as large as possible to improve the heat absorption and dissipation effect, and in subsequent research, we found that this conclusion is not entirely correct.

[0009] The technical problem solved by the present case is how to improve the heat dissipation effect of the heat dissipation gel. Practical new type content

[0010] The purpose of the present utility model is to provide a hydrogel heat sink, which uses multiple phase change hydrogel blocks and sets gaps between adjacent phase change hydrogel blocks to improve the heat dissipation effect.

[0011] To achieve the above purpose, the present application discloses:

[0012] A hydrogel heat sink, comprising a heat-conducting base, a phase change hydrogel unit fixed on the heat-conducting base;

[0013] The phase change hydrogel unit comprises a gas-permeable film with gas permeability and water impermeability, and a plurality of phase change hydrogel blocks; the plurality of phase change hydrogel blocks are enclosed in a closed space; at least a part of the closed space is composed of the gas-permeable film; the phase change hydrogel blocks and the heat-conducting base are in thermal conductive connection;

[0014] Gaps exist between adjacent phase change hydrogel blocks.

[0015] The present utility model adopts the design of multiple phase change hydrogel blocks with gaps, which can improve the heat dissipation effect. Specifically, in the traditional scheme, the heat dissipation structure is composed of phase change hydrogel and gas-permeable film, and water vapor enters the atmosphere through the gas-permeable film to realize heat dissipation; in the present scheme, the phase change hydrogel blocks not only can directly pass through the gas-permeable film into the atmosphere to dissipate heat, but also can form a gas environment with higher vapor pressure than the atmosphere in the gaps, and the gas exchange between the atmosphere and the gas environment in the gaps is more smooth, which can improve the speed of water vapor entering the atmosphere and improve the heat dissipation effect of the phase change hydrogel.

[0016] In the cooling process, the same reason, in the gap, compared to atmospheric pressure, a smaller gas environment, atmospheric water vapor through the gas permeable membrane into the gap of the gas environment and quickly absorbed by the phase change hydrogel block, improve the water absorption speed of the phase change hydrogel, it can make the radiator can adapt to the frequent temperature changes in the working environment, so that the radiator can quickly from the atmosphere after the heat dissipation into the water re-enter the heat dissipation ready state.

[0017] In the present solution, the gas permeable membrane, phase change hydrogel are mature materials available in the market, can be directly purchased through the market channel, the present solution does not further limit the material, model of both.

[0018] In the above hydrogel radiator, the heat-conducting base is in thermal contact with the external heat source, or the heat-conducting base is the outer surface of the external heat source.

[0019] In the above hydrogel radiator, the closed space is formed by the gas permeable membrane, and the upper and lower surfaces of the plurality of phase change hydrogel blocks are in contact with or connected to the gas permeable membrane; the gas permeable membrane is in thermal contact with the heat-conducting base.

[0020] Alternatively, the closed space is formed by the gas permeable membrane and the heat-conducting base, the upper surface of the plurality of phase change hydrogel blocks is in contact with or connected to the gas permeable membrane, and the lower surface of the plurality of phase change hydrogel blocks is connected to the heat-conducting base.

[0021] That is, in the present solution, the thermal contact between the phase change hydrogel block and the heat-conducting base can be direct contact between the phase change hydrogel block and the heat-conducting base, or indirect connection with the gas permeable membrane in between.

[0022] In the above direct contact connection, the gas permeable membrane is covered on the plurality of phase change hydrogel blocks and its four sides are welded or bonded to the heat-conducting base. The welding material can be selected as a heat-conducting structural adhesive.

[0023] In the above hydrogel radiator, the phase change hydrogel block is plate-shaped or columnar. In some application scenarios of the present solution, the phase change hydrogel block can also be granular, hemispherical, etc. These shapes are not commonly used and will not be described in detail; the most commonly used structure is plate-shaped or columnar

[0024] In the above hydrogel radiator, the gap is 1-20 mm.

[0025] In the above hydrogel radiator, the gap is 1.5-5.0 mm.

[0026] In actual application, the specification of the gap is not mandatory, and its purpose is mainly to form a water vapor pressure environment. Generally speaking, the larger the area of the phase change hydrogel block, the larger the gap will be, and the smaller the area of the phase change hydrogel block, the smaller the gap will be.

[0027] In the hydrogel heat spreader, the air-permeable film is a PET film; the PET film has air-permeable holes with a pore size of 0.05-0.85 μm.

[0028] In the hydrogel heat spreader, if the heat distribution on the heat-conducting base is uneven and has at least one heat source point, the phase-change hydrogel blocks arranged near the heat source point are first phase-change hydrogel blocks, and the phase-change hydrogel blocks distributed on the periphery of the first phase-change hydrogel blocks are second phase-change hydrogel blocks; the area of the heat-conducting connection of the first phase-change hydrogel blocks with the heat-conducting base is smaller than the area of the heat-conducting connection of the second phase-change hydrogel blocks with the heat-conducting base.

[0029] The gap between adjacent first phase-change hydrogel blocks is smaller than the gap between adjacent second phase-change hydrogel blocks.

[0030] As a preferred embodiment of the present application, the design of the phase-change hydrogel blocks of different sizes can improve the rapid heat dissipation for uneven heat source environment; for example, the center of the heat-conducting base is a heat source, and the first phase-change hydrogel blocks can quickly convert the liquid water contained therein into gaseous water and enter the gaseous environment in the gap; the rapid heat dissipation of the first phase-change hydrogel blocks and the relatively slow heat dissipation of the surrounding second phase-change hydrogel blocks can improve the heat dissipation speed.

[0031] At the same time, due to the existence of the gap, once the heat source disappears or the temperature decreases, the first phase-change hydrogel blocks will absorb moisture from the gap (the water vapor pressure in the gap is greater than the water vapor pressure of the external atmosphere), so that the water vapor pressure of the gaseous atmosphere in the gap tends to decrease, and the second phase-change hydrogel blocks will quickly supplement water vapor in the gap when the water vapor pressure in the gaseous atmosphere decreases, so that the first phase-change hydrogel blocks can be quickly replenished with water to quickly prepare for the working state.

[0032] Therefore, through the optimized design, the sudden increase of the heat source temperature can be more agilely coped with, and the rapid heat dissipation and the rapid preparation for the working state can be achieved to adapt to the working condition of frequent temperature increase and decrease of the heat source.

[0033] In the hydrogel heat spreader, the heat-conducting connection is a direct or indirect connection through a heat-conducting adhesive; the material of the heat-conducting base is one of metal, graphite and heat-conducting silica gel; the shape of the heat-conducting base is one of plate, sphere, hemisphere, cylinder, block and amorphous shape.

[0034] If the heat-conducting base is in amorphous shape, the material of the heat-conducting base is heat-conducting silica gel.

[0035] The number of the phase-change hydrogel blocks is 2-40.

[0036] The air-permeable film is fixedly connected with the heat-conducting base through a plurality of fixing members; the fixing members are arranged at positions of the gaps.

[0037] The application has at least the following beneficial effects:

[0038] The water gel heat sink adopts a plurality of phase change water gel blocks, and gaps are arranged between adjacent phase change water gel blocks, so that the heat dissipation effect can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a plan view of the embodiment 1 of the utility model;

[0040] Figure 2 It is an A-A sectional view of one implementation form of the embodiment 1 of the utility model;

[0041] Figure 3 It is an A-A sectional view of another implementation form of the embodiment 1 of the utility model;

[0042] Figure 4 It is a perspective view of the embodiment 1 of the utility model;

[0043] Figure 5 It is a plan view of the embodiment 2 of the utility model. DETAILED DESCRIPTION

[0044] The utility model will be clearly and completely described below in combination with the embodiments of the utility model, and in the description of the utility model, it should be noted that, if the specific conditions are not indicated in the embodiments, the conventional conditions or the recommended conditions of the manufacturer are adopted. If the reagents or instruments used are not indicated by the manufacturers, they are all conventional products that can be purchased in the market.

[0045] Embodiment 1

[0046] REFERENCE Figure 1 and Figure 4 A water gel heat sink, comprising a heat-conducting base 1, and a phase change water gel unit fixed on the heat-conducting base 1.

[0047] The phase change water gel unit comprises an air-permeable film 2 with air permeability and water impermeability, and a plurality of phase change water gel blocks 3; the plurality of phase change water gel blocks 3 are enclosed in a closed space; at least a part of the closed space is formed by the air-permeable film 2; the phase change water gel blocks 3 are in heat-conducting connection with the heat-conducting base 1; the closed space described herein refers to an air-permeable and water-impermeable closed space;

[0048] Gaps 4 exist between adjacent phase change water gel blocks 3.

[0049] The hydrogel block is made of reversible phase change hydrogel material. The reversible phase change hydrogel block 3 is a hydrophilic three-dimensional network structure gel. The three-dimensional network micro-porous structure can provide a larger surface area, and enhance the adsorption capacity and molecular interaction capacity, so that a large amount of water can be absorbed, and a certain structure shape can be maintained. At the same time, due to the very large specific surface area of the reversible phase change hydrogel, the water adsorbed on the surface of the hydrogel will be phase changed into gaseous steam under certain conditions, and when cooled, the water will be absorbed from the surrounding environment to form a liquid gel state.

[0050] The breathable film 2 can be a breathable PET microporous film (waterproof and breathable film 2), which has the functions of being breathable and waterproof. Liquid water cannot flow out of the PET microporous film, thereby ensuring the safety of the heating element in use. However, when the water in the phase change hydrogel is vaporized into water vapor, the water vapor molecules can escape from the micropores of the PET microporous film, thereby dissipating the heat generated by the heating element. The breathable PET microporous film has breathable pores with a pore size of 0.05 μm to 0.85 μm.

[0051] In use, the heat-conducting base 1 is attached to an external heat source by means of heat-conducting silicone adhesive. The phase change hydrogel block 3 of the phase change hydrogel unit is in heat-conducting connection with the heat-conducting base 1. When the external heat source is heated to a certain extent, the water in the phase change hydrogel unit is phase changed into gaseous heat-absorbing water vapor, which is dissipated to the atmosphere through the breathable film 2. In this process, the atmosphere directly exchanges matter with the phase change hydrogel block 3 through the breathable film 2, and the atmosphere exchanges matter with the gas atmosphere in the gap 4 through the breathable film 2. The water vapor pressure in the gas atmosphere in the gap 4 is relatively high at this time, and the water vapor can quickly enter the atmosphere. In other implementation forms of the embodiment, the heat-conducting base 1 is the outer surface of the external heat source. In this case, the external heat source and the phase change hydrogel unit constitute the hydrogel heat sink.

[0052] When the temperature of the external heat source decreases, the above process of releasing water vapor into the atmosphere is reversed, i.e. the atmosphere supplies water to the phase change hydrogel block 3.

[0053] The phase change hydrogel unit of the embodiment can have two implementation forms, which are specifically described with reference to Figure 2 and Figure 3 ;

[0054] With reference to Figure 2 , the closed space is composed of the breathable film 2, and the upper and lower surfaces of the plurality of phase change hydrogel blocks 3 are in contact with or connected to the breathable film 2, respectively. The breathable film 2 is in heat-conducting connection with the heat-conducting base 1. The breathable film 2 and the heat-conducting base 1 are connected by welding. The welding material is heat-conducting structural adhesive 5, and the welding temperature is controlled at 80-85°C.

[0055] Reference Figure 3 , the closed space is formed by the air-permeable film 2 and the heat-conducting base 1, the upper surface of the plurality of phase change hydrogel blocks 3 is in contact with or connected to the air-permeable film 2, and the lower surface of the plurality of phase change hydrogel blocks 3 is connected to the heat-conducting base 1. In Figure 3 In an implementation form, the air-permeable film 2 is overlaid on the plurality of phase change hydrogel blocks 3 and is welded or bonded around the periphery thereof to the heat-conducting base 1. The material for welding can be selected as the heat-conducting structural adhesive 5. Preferably, the air-permeable film 2 and the heat-conducting base 1 are connected by welding, the welding material is the heat-conducting structural adhesive 5, and the welding temperature is controlled at 80-85°C. The lower surface of the phase change hydrogel block 3 and the heat-conducting base 1 can be connected by direct contact.

[0056] That is, in the present solution, the heat-conducting connection between the phase change hydrogel block 3 and the heat-conducting base 1 can be direct contact connection or indirect connection with the air-permeable film 2 interposed therebetween.

[0057] In the above solution, the phase change hydrogel block 3 is plate-shaped or columnar. In some application scenarios of the present solution, the phase change hydrogel block 3 can also be granular, semi-spherical, etc. These shapes are not commonly used and will not be described in detail; the most commonly used structures are plate-shaped or columnar.

[0058] Preferably, the gap 4 is 1-20 mm. More preferably, the gap 4 is 1.5-5.0 mm.

[0059] In actual applications, the specification of the gap 4 is not mandatory, and its main purpose is to constitute a water vapor pressure environment. Generally speaking, the larger the area of the phase change hydrogel block 3, the larger the gap 4 will be, and the smaller the area of the phase change hydrogel block 3, the smaller the gap 4 will be.

[0060] In the present embodiment, the material of the heat-conducting base 1 is one of metal, graphite, and heat-conducting silica gel; the metal is iron, aluminum, copper, zinc, or various metal alloys;

[0061] The shape of the heat-conducting base 1 is plate-shaped, spherical, semi-spherical, cylindrical, block-shaped, or amorphous.

[0062] If the heat-conducting base body 1 is in an amorphous shape, the material of the heat-conducting base body 1 is a heat-conducting silica gel material. The heat-conducting silica gel described herein refers to a heat-conducting silica gel with a certain elastic deformation capacity. The heat-conducting silica gel has the characteristic of elastic deformation. The advantage of such design is that the heat-conducting base body 1 can be adapted to different application environments in a form that can be deformed at will. For example, the heat-conducting base body 1 made of silica gel material can be designed in a bag-like structure with one side open. In this way, it can be fitted on the surface of an object of any shape. Through the elastic deformation of the silica gel and various external heat sources, better and closer fitting can be achieved to achieve good heat dissipation.

[0063] In the present embodiment, the number of phase change hydrogel blocks 3 is 2-40, preferably 5-30, and more preferably 8-20. The user can flexibly design the number of phase change hydrogel blocks 3 according to the actual situation, and the present embodiment does not make additional limitations.

[0064] In the present embodiment, the air-permeable film 2 is fixedly connected to the heat-conducting base body 1 by a plurality of fixing members 6. The fixing members 6 are arranged at the positions of the gaps 4. The fixing members 6 are preferably threaded locking members or the like, and have corresponding threaded holes on the heat-conducting base body 1. The air-permeable film 2 is further fixed on the heat-conducting base body 1 by the fixing members 6.

[0065] Embodiment 2

[0066] In many application scenarios, the heat source is not uniform. In this case, on the basis of embodiment 1, the following design is preferred:

[0067] Reference Figure 5 If the heat-conducting base body 1 has uneven heat distribution and at least one heat source point (one heat source point in the present embodiment, located at the center of the heat-conducting base body 1), the phase change hydrogel blocks 3 arranged near the heat source point are first phase change hydrogel blocks 7, and the phase change hydrogel blocks 3 distributed on the periphery of the first phase change hydrogel blocks 7 are second phase change hydrogel blocks 8. The area of the heat-conducting connection between the first phase change hydrogel blocks 7 and the heat-conducting base body 1 is smaller than the area of the heat-conducting connection between the second phase change hydrogel blocks 8 and the heat-conducting base body 1.

[0068] The gap 4 between adjacent first phase change hydrogel blocks is smaller than the gap 4 between adjacent second phase change hydrogel blocks. For example, the gap 4 between adjacent first phase change hydrogel blocks is 1 mm, and the gap 4 between adjacent second phase change hydrogel blocks is 4 mm.

[0069] As a preferred scheme of the present scheme, through the design of the phase change hydrogel blocks 3 of different sizes, the rapid heat dissipation for the non-uniform heat source environment can be improved; for example, the central part of the heat-conducting base 1 is the heat source, and the first phase change hydrogel block 7 can quickly realize the conversion of the liquid water contained therein into gaseous water and enter the gas environment in the gap 4; through the rapid heat dissipation of the first phase change hydrogel block 7 and the relatively slow heat dissipation of the surrounding second phase change hydrogel block 8, the heat dissipation speed can be improved.

[0070] At the same time, due to the existence of the gap 4, once the heat source disappears or the temperature decreases, the first phase change hydrogel block 7 will absorb moisture from the gap 4 (at this time, the water vapor pressure in the gap 4 is greater than the water vapor pressure in the external atmosphere), so that the water vapor pressure in the gas atmosphere in the gap 4 has a downward trend, and at this time, the second phase change hydrogel block 8 will quickly supplement water vapor into the gap 4 when the water vapor pressure in the gas atmosphere in the gap 4 decreases, so that the first phase change hydrogel block 7 can be quickly watered to quickly prepare for the working state of the first phase change hydrogel block 7.

[0071] Therefore, through the optimization design, the sudden increase of the heat source temperature working condition can be more agilely coped with, the rapid heat dissipation and the rapid working preparation state can be quickly prepared to adapt to the heat source frequent temperature rising and falling working condition.

[0072] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A hydrogel heat spreader, characterized by, The phase change hydrogel unit comprises a gas-permeable film with gas permeability and water impermeability, and a plurality of phase change hydrogel blocks; the plurality of phase change hydrogel blocks are enclosed in a closed space; at least a part of the closed space is formed by the gas-permeable film; the phase change hydrogel blocks and the heat-conductive base are in heat-conductive connection. Gaps exist between adjacent phase change hydrogel blocks. The atmosphere exchanges substances through the gas-permeable film and the gas atmosphere in the gaps. The heat-conductive base is in heat-conductive connection with an external heat source, or the heat-conductive base is the external surface of the external heat source.

2. The hydrogel heat spreader of claim 1, wherein, The closed space is formed by the gas-permeable film, and the upper and lower surfaces of the plurality of phase change hydrogel blocks are in contact with or connected to the gas-permeable film; the gas-permeable film is in heat-conductive connection with the heat-conductive base.

3. The hydrogel heat spreader of claim 1, wherein, Alternatively, The closed space is formed by the gas-permeable film and the heat-conductive base, the upper surfaces of the plurality of phase change hydrogel blocks are in contact with or connected to the gas-permeable film, and the lower surfaces of the plurality of phase change hydrogel blocks are connected to the heat-conductive base. The phase change hydrogel blocks are plate-shaped or columnar.

4. The hydrogel heat spreader of claim 1, wherein, The gaps are 1-20 mm.

5. The hydrogel heat spreader of claim 1, wherein, The gaps are 1.5-5.0 mm.

6. The hydrogel heat spreader of claim 5, wherein, The gas-permeable film is a PET film; the PET film has gas-permeable holes with a pore size of 0.05-0.85 μm.

7. The hydrogel heat spreader of claim 1, wherein, The heat-conductive base has uneven heat distribution and at least one heat source point; the phase change hydrogel blocks arranged near the heat source point are first phase change hydrogel blocks, and the phase change hydrogel blocks distributed on the periphery of the first phase change hydrogel blocks are second phase change hydrogel blocks; the area of the heat-conductive connection between the first phase change hydrogel blocks and the heat-conductive base is smaller than the area of the heat-conductive connection between the second phase change hydrogel blocks and the heat-conductive base.

8. The hydrogel heat spreader of claim 1, wherein, The gaps between adjacent first phase change hydrogel blocks are smaller than the gaps between adjacent second phase change hydrogel blocks. The heat-conductive connection refers to direct or indirect connection through heat-conductive glue; the material of the heat-conductive base is one of metal, graphite, and heat-conductive silica gel; the shape of the heat-conductive base is plate-shaped, spherical, hemispherical, cylindrical, block-shaped, or amorphous.

9. The hydrogel heat spreader of any one of claims 1-8, wherein, If the heat-conductive base is amorphous, the material of the heat-conductive base is heat-conductive silica gel. The number of the phase change hydrogel blocks is 2-40. The gas-permeable film is fixedly connected to the heat-conductive base through a plurality of fixing members; the fixing members are arranged at the positions of the gaps.

10. The hydrogel heat spreader of any one of claims 1-8, wherein, ​

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