A biomass aerogel capillary wick-based vapor chamber

Abstract

The present application belongs to the technical field of thin plate-shaped heat spreaders, and particularly relates to a uniform heating plate based on a biomass aerogel capillary core. The uniform heating plate comprises, from bottom to top along the vertical direction, an evaporation end shell plate, a biomass aerogel capillary core and a condensation end shell plate. The biomass aerogel capillary core is located in a closed cavity formed by the evaporation end shell plate and the condensation end shell plate, and the biomass aerogel capillary core is in contact with the evaporation end shell plate and the condensation end shell plate. The biomass aerogel capillary core is a chitosan-cellulose aerogel capillary core, and the porosity of the chitosan-cellulose aerogel capillary core is greater than 95%. The present application replaces the traditional capillary core by designing a chitosan-cellulose composite aerogel capillary core, and develops a biomass capillary core uniform heating plate with high capillary driving force, high liquid reflux capacity, low cost, new manufacturing process, light weight, environmental protection and sustainable development.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thin plate-shaped heat spreaders, and particularly relates to a uniform heating plate based on a biomass aerogel capillary core. BACKGROUND

[0002] As a kind of efficient and light heat management device, the uniform heating plate is widely used in the heat dissipation system of power electronic devices, such as CPU, GPU, LED lighting and high-power laser, etc. One of the core principles of the high heat dissipation effect of the uniform heating plate is to use the internal capillary structure to realize the rapid return flow of the liquid working medium to promote the uniform distribution of the liquid working medium and the phase change efficiency. Therefore, reasonable capillary core design can significantly improve the heat conduction efficiency and stability of the uniform heating plate, and is the guarantee of the heat dissipation capacity of the uniform heating plate. The popular capillary structures of the uniform heating plate at present stage include sintered structure core, net structure core, micro-groove structure core and composite core composed of the above three.

[0003] Although the uniform heating plate is efficient in phase change heat dissipation and uniform heat distribution, and is superior to the traditional heat dissipation fins in terms of heat dissipation performance, space utilization and reliability, and is particularly suitable for the heat management of high-end electronic equipment. However, due to the use of metal capillary core in the traditional uniform heating plate, the low porosity and fixed pore size design of the metal capillary core result in low capillary driving force and return flow capacity, and the material manufacturing process of the metal capillary core is complex and the cost is high. SUMMARY

[0004] In order to solve the above problems, the present application provides a uniform heating plate based on a biomass aerogel capillary core. The present application designs a chitosan-cellulose composite aerogel capillary core to replace the traditional capillary core, and develops a biomass capillary core uniform heating plate with high capillary driving force, high liquid return flow capacity, low cost, new manufacturing process, light weight, environmental protection and sustainable development. The chitosan-cellulose composite aerogel capillary core has high porosity, uniform microporous structure, hydrophilic material properties and multi-scale pores, realizes strong capillary driving force and return flow liquid capacity. These characteristics work together to make the aerogel capillary core perform well in promoting the return flow of condensed liquid and enhancing the working medium circulation efficiency, realizing rapid and efficient liquid return flow in the aerogel capillary core uniform heating plate. And the aerogel capillary core is made of two biomass materials of chitosan and cellulose, the manufacturing process is simple, the cost is low, and the aerogel capillary core has the characteristics of light weight, environmental protection and sustainable development.

[0005] The present application solves the above technical problems by the following technical solutions.

[0006] The purpose of the present application is to provide a biomass aerogel capillary wick heat plate, comprising an evaporation end shell plate, a biomass aerogel capillary wick and a condensation end shell plate arranged in turn from bottom to top in the vertical direction, the biomass aerogel capillary wick is located in the closed cavity formed by the evaporation end shell plate and the condensation end shell plate, the biomass aerogel capillary wick is in contact with the evaporation end shell plate and the condensation end shell plate, the biomass aerogel capillary wick is chitosan-cellulose aerogel capillary wick, and the porosity of the chitosan-cellulose aerogel capillary wick is >95%.

[0007] Further, the preparation method of the biomass aerogel capillary wick comprises the following steps:

[0008] Chitosan is dissolved in acetic acid solution to obtain a chitosan solution;

[0009] The cellulose solution is added to the chitosan solution, cross-linking is carried out at 55 ℃-65 ℃, an aerogel precursor is obtained, and the biomass aerogel capillary wick is obtained after freeze-drying of the aerogel precursor.

[0010] Further, the volume ratio of the chitosan solution and the cellulose solution is 1:1, the concentration of the chitosan solution is 2wt.%-2.4wt.%, the concentration of the cellulose solution is 1wt.%-1.2wt.%, the cross-linking time is 1.5h-3h, the freeze-drying temperature is-60 ℃, and the freeze-drying time is 24h-48h.

[0011] Further, the upper surface of the biomass aerogel capillary wick is provided with a groove, and the space formed between the groove and the condensation end shell plate is used for the flow of steam and condensate.

[0012] Further, the depth of the groove and the height of the biomass aerogel capillary wick are in a ratio of 1:4-5, and the length and width of the groove and the length and width of the biomass aerogel capillary wick are in a ratio of 1:0.4-4.5.

[0013] Further, the height ratio of the evaporation end shell plate, the biomass aerogel capillary wick and the condensation end shell plate is 14:10:3-5, and the length ratio or the width ratio is 90-95:90:90-95.

[0014] Further, the evaporation end shell plate is a frame structure, a plurality of support columns are uniformly arranged in the frame structure, the spacing between adjacent support columns is 8mm-12mm, and the height ratio of all support columns to the evaporation end shell plate is 10:13-15.

[0015] Further, the biomass aerogel capillary wick is inserted into all the support columns, the lower wall of the biomass aerogel capillary wick is in contact with the inner wall of the evaporation end shell plate, and the upper end of all the support columns is in contact with the inner wall of the condensation end shell plate.

[0016] Further, the cross section of the support column is square, circular or diamond-shaped.

[0017] Further, one side wall of the evaporation end shell plate is provided with a liquid injection port.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] (3) The heat plate provided by the present application comprises, from bottom to top along the vertical direction, an evaporation end shell plate, a biomass aerogel capillary core and a condensation end shell plate, the biomass aerogel capillary core is located in the closed cavity formed by the evaporation end shell plate and the condensation end shell plate, the biomass aerogel capillary core is in contact with the evaporation end shell plate and the condensation end shell plate, the biomass aerogel capillary core is a chitosan-cellulose aerogel capillary core, the chitosan-cellulose composite aerogel capillary core is designed to replace the traditional capillary core, and a biomass capillary core heat plate with high capillary driving force, high liquid reflux capacity, low cost, new manufacturing process, light weight, environmental protection and sustainable development is developed, the biomass aerogel capillary core has a uniform microporous structure with high porosity (> 95%) and high specific surface area, hydrophilic material characteristics and multi-scale pores, the high porosity makes the aerogel capillary core full of small pores, provides more capillary channels for the working fluid, forms close contact with the liquid working medium, realizes strong capillary driving force and reflux liquid capacity, significantly enhances the wettability and heat transfer efficiency of the liquid on the surface of the capillary core, and is beneficial to the reduction of the thermal resistance of the entire heat plate.

[0020] (4) The biomass aerogel capillary core adopted in the present application selects a natural high molecular biomass material. Chitosan and cellulose both have rich hydrophilic groups, can uniformly distribute the liquid working medium and enhance the evaporation efficiency. Traditional capillary core materials (such as sintered copper) are slightly inferior in working medium wettability and may have a risk of local dryness.

[0021] (5) This invention is made from chitosan and cellulose by freeze-drying, with a porosity of over 95% and filled with uniformly distributed micropores (average pore size of about 50 μm). This significantly enhances the capillary driving force, enabling the condensate to flow back to the evaporation zone rapidly. Simultaneously, the uniformity of the microporous structure avoids the flow dead zones and liquid reflux resistance caused by uneven pore size in traditional metal capillary cores, resulting in smoother flow of the working fluid and preventing localized drying. During the freeze-drying process, a certain number of macropores (pore size greater than 200 μm) are also formed in the aerogel capillary core, forming a multi-scale pore structure together with the micropores: macropores are responsible for rapid liquid reflux, while micropores provide high capillary driving force. This multi-scale structure achieves a dynamic balance between capillary driving force and reflux speed, optimizing the circulation path of the working fluid. Furthermore, the aerogel capillary core can be processed into different shapes and thicknesses using simple processes, adapting to diverse vapor chamber design requirements and effectively addressing the development needs of various thin vapor chambers and even flexible vapor chambers. Attached Figure Description

[0022] Figure 1 This is a three-dimensional cross-sectional view of the heat spreader plate of the present invention.

[0023] Figure 2 This is an exploded three-dimensional view of the heat spreader of the present invention.

[0024] Figure 3 This is a three-dimensional diagram of the biomass aerogel capillary core of the present invention.

[0025] Figure 4 This is a front view of the biomass aerogel capillary core of the present invention.

[0026] Figure 5 This is a top view of the biomass aerogel capillary core of the present invention.

[0027] Figure 6 This is a cross-sectional view of the biomass aerogel capillary core of the present invention.

[0028] Figure 7 This is a three-dimensional view of the evaporator end shell plate of the present invention.

[0029] Figure 8 This is a front view of the evaporator end shell plate of the present invention.

[0030] Figure 9 This is a top view of the evaporator end shell plate of the present invention.

[0031] Figure 10 This is a cross-sectional view of the evaporator end shell plate of the present invention.

[0032] Figure 11 This is a three-dimensional view of the condenser end shell plate of the present invention.

[0033] Figure 12The front view of the condensing end shell plate of the application.

[0034] Figure 13 The top view of the condensing end shell plate of the application.

[0035] 1, Evaporation end shell plate, 2, Biomass aerogel capillary core, 3, Condensing end shell plate, 4, Groove, 5, Support column, 6, Liquid injection port. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0037] It should be noted that the professional terms used in the application are only for the purpose of describing the specific embodiments, and are not intended to limit the protection scope of the application. In the application, certain terms are used to refer to specific components. Those skilled in the art should understand that the same component can be referred to by different terms. The application does not distinguish components by the difference in terms, but by the difference in function. As mentioned throughout the specification and claims, "including" is an open term, so it should be understood as "including but not limited to".

[0038] Since the traditional heat plate adopts a metal capillary core, due to the low porosity and fixed pore size design of the metal capillary core, the capillary driving force and backflow capacity are low, and the material manufacturing process of the metal capillary core is complex and the cost is high. Based on the above problems, the application provides a biomass aerogel capillary core heat plate, as shown in Figures 1-2 The evaporation end shell plate 1, the biomass aerogel capillary core 2 and the condensing end shell plate 3 are arranged in the vertical direction from bottom to top in sequence, the biomass aerogel capillary core 2 is located in the closed cavity formed by the evaporation end shell plate 1 and the condensing end shell plate 3, the biomass aerogel capillary core 2 is in contact with the evaporation end shell plate 1 and the condensing end shell plate 3, the biomass aerogel capillary core 2 is a chitosan-cellulose aerogel capillary core, and the porosity of the chitosan-cellulose aerogel capillary core is > 95%.

[0039] The chitosan-cellulose aerogel capillary core is packaged in the evaporation end shell plate 1 and the condensing end shell plate 3, the evaporation end shell plate 1 is made of red copper, in this embodiment, the evaporation end shell plate 1 and the condensing end shell plate 3 are both engraved from a red copper plate with a length, width and height of 110 mm*110 mm*20 mm, one side wall of the evaporation end shell plate 1 is provided with a liquid injection port for injecting working medium and maintaining a vacuum environment.

[0040] The heat plate provided by the application replaces the traditional capillary core by designing a chitosan-cellulose composite aerogel capillary core, develops a biomass capillary core heat plate with high capillary driving force, high liquid reflux capacity, low cost, new manufacturing process, light weight, environmental protection and sustainable development, the biomass aerogel capillary core has a uniform microporous structure with high porosity (>95%) and high specific surface area, hydrophilic material characteristics and multi-scale pores, the high porosity makes the aerogel capillary core full of small pores, provides more capillary channels for the working fluid, forms close contact with the liquid working medium, realizes strong capillary driving force and reflux liquid capacity, significantly enhances the wettability and heat transfer efficiency of the liquid on the surface of the capillary core, and is beneficial to the reduction of the thermal resistance of the whole heat plate.

[0041] The specific surface area of the biomass aerogel capillary core 2 is very high (up to 200 m 2 / g), which provides a larger adhesion and flow interface for the liquid, and further improves the capillary flow capacity of the liquid. The biomass aerogel capillary core 2 has an ultra-low density (10000 g / m 3 ), so that the overall mass of the capillary core is much lower than that of the traditional metal capillary core, which is beneficial to the lightweight of the overall heat plate.

[0042] The preparation method of the heat plate comprises the following steps: assembling the evaporation end shell plate 1, the biomass aerogel capillary core 2 and the condensation end shell plate 3 into an integrated body, welding them into a sealed whole by using low-temperature welding technology, then injecting the working medium, vacuumizing to 10 -2 pa, and then welding the liquid injection port to be sealed to obtain the heat plate.

[0043] When the heat source (such as a chip or a high heat flux device) is in contact with the evaporation end shell plate 1 at the bottom of the vapor chamber, the biomass aerogel capillary wick 2 is heated by being in close contact with the evaporation section shell plate 1, thereby transferring heat to the working medium. The high specific surface area microporous structure and hydrophilic material in the biomass aerogel capillary wick 2 enhance the contact between the liquid working medium and the surface of the capillary wick. After absorbing heat, the working medium rapidly evaporates into a gas, converting the heat from the heat source into the latent heat of the working medium vapor. The temperature in the evaporation area decreases, and the heat is diffused in the form of gas to the condensation area. After the vapor reaches the condensation area, it comes into contact with the condensation end shell plate 3, releases heat, and condenses into liquid working medium. The condensed liquid flows back to the evaporation area through the porous network of the biomass aerogel capillary wick 2. The high porosity (>95%) and small pore size (about 50 μm) provide strong capillary driving force, enabling efficient backflow even in the direction against gravity. The multi-scale pore structure optimizes the liquid flow path, with large pores promoting rapid flow and small pores maintaining capillary driving force. The hydrophilic groups (such as hydroxyl and amino groups) enhance the wettability of the working medium to the surface of the capillary wick, avoiding liquid aggregation or flow interruption. Throughout the entire cycle, the biomass aerogel capillary wick 2 uniformly distributes heat through efficient liquid backflow and vapor diffusion. The phase change cycle continuously occurs, allowing heat to quickly transfer from the evaporation end shell plate 1 to the condensation end shell plate 2, achieving the high efficiency heat dissipation requirement of the vapor chamber.

[0044] In one specific embodiment, the method for preparing the biomass aerogel capillary wick comprises the following steps:

[0045] S1, dissolving chitosan in an acetic acid solution to obtain a chitosan solution.

[0046] S2, adding the cellulose solution to the chitosan solution, cross-linking at 55 ℃-65 ℃ to obtain an aerogel precursor, and freeze-drying the aerogel precursor to obtain the biomass aerogel capillary wick.

[0047] In one specific embodiment, the volume ratio of the chitosan solution and the cellulose solution is 1:1, the concentration of the chitosan solution is 2 wt.%-2.4 wt.%, and the concentration of the cellulose solution is 1 wt.%-1.2 wt.%; the cross-linking time is 1.5 h-3 h, the freeze-drying temperature is -60 ℃, and the freeze-drying time is 24 h-48 h. It should be noted that the freeze-drying time is determined according to the thickness of the biomass aerogel capillary wick, which is generally between 24 h and 48 h.

[0048] The biomass aerogel capillary core prepared in this invention utilizes natural high-molecular-weight biomass materials. Both chitosan and cellulose possess abundant hydrophilic groups, endowing the aerogel capillary core with hydrophilic properties. This enhances the wettability of the working fluid on and within the capillary core, ensuring a more uniform distribution of the working fluid in the evaporation zone and reducing localized hot spots. Traditional capillary core materials (such as sintered copper) are slightly inferior in terms of working fluid wettability, potentially leading to localized drying risks. The aerogel core, prepared from chitosan and cellulose via freeze-drying, boasts a porosity exceeding 95%, filled with uniformly distributed micropores (average pore size approximately 50 μm). This significantly enhances capillary driving force, enabling rapid reflux of condensed liquid back to the evaporation zone. Simultaneously, the uniformity of the microporous structure avoids the flow dead zones and liquid reflux resistance caused by uneven pore size in traditional metal capillary cores, resulting in smoother internal flow of the working fluid and preventing localized drying. During the freeze-drying process, a number of macropores (pore diameter greater than 200 μm) are formed in the aerogel capillary core, which, together with the micropores, constitute a multi-scale pore structure: macropores are responsible for rapid liquid reflux, while micropores provide high capillary driving force; this multi-scale structure achieves a dynamic balance between capillary driving force and reflux velocity, optimizing the circulation path of the working fluid. Furthermore, the aerogel capillary core can be processed into different shapes and thicknesses using simple processes, adapting to diverse vapor chamber design requirements and effectively addressing the development needs of various thin vapor chambers and even flexible vapor chambers.

[0049] In one specific embodiment, such as Figures 3-6 As shown, the upper surface of the biomass aerogel capillary 2 is provided with a groove 4, and the space formed between the groove and the condenser end shell 3 is used for the flow of steam and condensate. The ratio of the depth of the groove 4 to the height of the biomass aerogel capillary 2 is 1:4 to 5, and the ratio of its length and width to the length and width of the biomass aerogel capillary 2 is 1:0.4 to 4.5. In this embodiment, the length × width × height dimensions of the biomass aerogel capillary 2 are... l 2× l 2× h 4. Both length and width are l 2 = 90 mm, overall height is h 4 = 10 mm; the length × width × height dimensions of groove 4 are l 3× l 3× h 5. Both length and width are l 3 = 70 mm, internal height is h 5 = 5 mm, the width of the frame of the biomass aerogel capillary core 2 is 5 mm. l 4 That is, the distance between the inner wall of the groove 4 and the edge of the corresponding biomass aerogel capillary core 3, the width of which is l 4=5 mm, the convex part of the groove 4 is to return the condensed liquid, the concave groove is the steam space, the size of the groove 4 is designed to maintain a certain steam space, reduce the steam pressure drop, and let the working fluid evaporate smoothly and with small resistance to contact the condensation area to liquefy and release heat. The four raised frame parts can quickly absorb the condensed liquid to return to the evaporation area. If the groove is too small, the steam space is not enough, and if the four raised frame parts are too small, the liquid return capacity is poor. It is a balance. In order to make the vaporization-liquefaction cycle of the vapor chamber run perfectly, the biomass aerogel capillary core 2 frame is tightly attached to the inner wall of the condensing end shell plate 3 for high-speed return of condensed liquid.

[0050] In one embodiment, the height ratio of the evaporation end shell plate 1, the biomass aerogel capillary core 2 and the condensing end shell plate 3 is 14:10:3-5, and the length ratio or width ratio is 90-95:90:90-95. In this embodiment, as shown in Figures 11-13 , the length x width x height of the condensing end shell plate 3 is l 5x l 5x h 6, the length and width are both l 5=90 mm, and the overall height is h 6=4 mm.

[0051] In one embodiment, as shown in Figures 7-10 , the evaporation end shell plate 1 is a frame structure, and a plurality of support columns 5 are evenly arranged in the frame structure. The spacing between adjacent support columns 5 is 8-12 mm, and the height ratio of all support columns 5 to the evaporation end shell plate 1 is 10:13-15. In this embodiment, the frame structure is a cube structure, and the length x width x height of the evaporation end shell plate 1 is l 1x l 1x h 1, the length and width are both l 1=92 mm, and the overall height is h 1=14 mm. The number of support columns 5 is 81, and the length x width x height of a single support column 5 is w 1x w 1x h 2, the length and width are both w 1=2 mm, and the height is h 2=10 mm. The support column 5 has a supporting and heat conducting effect, that is, the support column 5 can maintain the supporting capacity and maintain a good steam space, as described above, to reduce the steam pressure drop and make the steam flow better to the condensation area to condense into liquid.

[0052] In one embodiment, the biomass aerogel wick 2 is inserted into all the support columns 5, and the lower wall of the biomass aerogel wick 2 is in contact with the inner wall of the evaporation end shell plate 1, and the upper end of all the support columns 5 is in contact with the inner wall of the condensation end shell plate 3. In this embodiment, the biomass aerogel wick 2 is an aerogel, which is deformable, and after all the support columns 5 are inserted into the biomass aerogel wick 2, the upper end of all the support columns 5 is in contact with the inner wall of the condensation end shell plate 3, thereby increasing the close fit between all the support columns 5 and the biomass aerogel wick 2.

[0053] The space formed between the evaporation end shell plate 1 and the support columns 5 is used to place the biomass aerogel wick 2, and after the biomass aerogel wick 2 is inserted into all the support columns 5, the biomass aerogel wick 2 is in contact with the inner wall of the evaporation end shell plate 1.

[0054] In one embodiment, the cross section of the support column 5 is square, circular, or diamond-shaped. In this embodiment, the cross section of the support column 5 is square.

[0055] In one embodiment, one side wall of the evaporation end shell plate 1 is provided with a liquid injection port 7. In this embodiment, the outer diameter of the liquid injection port is d 1=5 mm, the inner diameter is d 2=4 mm, and the height is h 3=5 mm.

[0056] In summary, the application discloses a heat spreading plate based on a chitosan-cellulose composite biomass aerogel capillary wick, mainly comprising an evaporation end shell plate, a biomass aerogel and a condensation end shell plate. The heat spreading plate is made by using precision engraving and freeze drying technology. During the whole operation process, the heat source transmits heat to the biomass aerogel capillary wick through the evaporation end shell plate, the capillary wick quickly absorbs heat and converts the liquid working medium into steam due to its high porosity and liquid affinity. During the evaporation process, the liquid working medium quickly absorbs heat at the interface of the capillary wick micropore, forming latent heat of phase change, so that the temperature of the evaporation end is reduced. The steam diffuses to the condensation end shell plate through the channel inside the heat spreading plate, and the steam releases heat and condenses into liquid working medium after contacting the surface of the condensation end shell plate. At the same time, the condensation end shell plate efficiently transmits heat to the external heat dissipation system (such as air cooling or water cooling device), and dissipates heat to the environment. The liquid working medium formed by condensation returns to the evaporation area under the action of capillary driving force through the porous network of the capillary wick. The multi-scale pore structure optimizes the liquid flow path, and the large pores accelerate the return flow of the liquid, and the small pores provide sufficient capillary driving force. The porous network of the biomass aerogel capillary wick uniformly distributes the liquid and steam, avoids the generation of local hot spots, and ensures the uniform distribution of heat in the heat spreading plate. The phase change cycle process of evaporation, diffusion, condensation and return flow is efficiently carried out, which ensures the uniform distribution of heat in the heat spreading plate, significantly improves the heat dissipation efficiency, and can meet the harsh requirements of high heat flux density equipment on heat dissipation performance. The application has the advantages of high heat dissipation performance, lightweight, low cost and green environmental protection, and can be used to meet the heat dissipation demand of high-power chips, the lightweight equipment demand and the green product design demand.

[0057] It should be noted that when the numerical range is involved in the application, both endpoints of each numerical range and any number between the two endpoints can be selected. Since the same steps and examples are used, the preferred embodiments are described in the application to prevent redundancy. Although the preferred embodiments of the application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they understand the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the application.

[0058] Obviously, those skilled in the art can make various modifications and variations to the application without departing from the spirit and scope of the application. Thus, if these modifications and variations of the application fall within the scope of the claims of the application and their equivalent technologies, the application also intends to include these modifications and variations.

Claims

1. A vapor chamber of a biomass aerogel capillary wick, characterized by, The biomass aerogel capillary core (2) is located in the closed cavity formed by the evaporation end shell plate (1) and the condensation end shell plate (3), and the biomass aerogel capillary core (2) is in contact with the evaporation end shell plate (1) and the condensation end shell plate (3).

2. The biomass aerogel capillary wick based vapor chamber of claim 1, wherein, The preparation method of the biomass aerogel capillary core comprises the following steps: The chitosan solution is obtained by dissolving chitosan in an acetic acid solution. The chitosan solution and the cellulose solution are mixed at a volume ratio of 1:1, the concentration of the chitosan solution is 2 wt.% to 2.4 wt.%, and the concentration of the cellulose solution is 1 wt.% to 1.2 wt.%.

3. The biomass aerogel capillary wick based vapor chamber of claim 2, wherein, The depth of the groove (4) and the height of the biomass aerogel capillary core (2) are in a ratio of 1:4 to 5, and the length and width of the groove (4) and the length and width of the biomass aerogel capillary core (2) are in a ratio of 1:0.4 to 4.

5.

4. The biomass aerogel capillary wick based vapor chamber of claim 1, wherein, The height ratio of the evaporation end shell plate (1), the biomass aerogel capillary core (2) and the condensation end shell plate (3) is 14:10:3 to 5, and the length ratio or the width ratio is 90 to 95:90 to 95:90 to 95.

5. The biomass aerogel capillary wick based vapor chamber of claim 4, wherein, The evaporation end shell plate (1) is a frame structure, and a plurality of support columns (5) are uniformly arranged in the frame structure.

6. The biomass aerogel capillary wick based vapor chamber of claim 1, wherein, The biomass aerogel capillary core (2) is inserted into all the support columns (5), and the lower wall of the biomass aerogel capillary core (2) is in contact with the inner wall of the evaporation end shell plate (1), and the upper end of all the support columns (5) is in contact with the inner wall of the condensation end shell plate (3).

7. The biomass aerogel capillary wick based vapor chamber of claim 1, wherein, The cross section of the support column (5) is square, circular or rhombic.

8. The biomass aerogel capillary wick based vapor chamber of claim 6, wherein, One side wall of the evaporation end shell plate (1) is provided with a liquid injection port (6).

9. The biomass aerogel capillary wick based vapor chamber of claim 7, wherein, ​ 10. The biomass aerogel capillary wick based vapor chamber of claim 1, wherein, ​

Images