Phase change energy storage plate and preparation method thereof

Abstract

The invention relates to the technical field of phase-change energy storage materials, and particularly provides a phase-change energy storage plate and a preparation method thereof.The phase-change energy storage plate comprises a front aluminum plate, a honeycomb core layer made of aluminum materials and a back aluminum plate, the honeycomb core layer is formed by arranging a plurality of hexagonal columns in a matrix mode, each hexagonal column is filled with a phase-change material, and the phase-change material is arranged in the honeycomb core layer; the phase change material is selected from at least one of a graphite-based phase change material and a microcapsule phase change material, and the phase change material is selected from at least one of a graphite-based phase change material and a microcapsule phase change material. The phase change energy storage plate has high heat storage and release rate and thermal conductivity, has high bending strength and is convenient to popularize and apply.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change energy storage materials, and specifically relates to a phase change energy storage plate and a preparation method thereof. Background Art

[0002] With the global emphasis on the efficient utilization of energy and sustainable development, phase change energy storage technology has become one of the key technologies to alleviate the contradiction between energy supply and demand and improve energy utilization efficiency because it can store and release a large amount of energy at a specific temperature. In the field of architecture, traditional thermal insulation materials can only play a role in heat insulation, with low heat capacity, unable to effectively store solar energy or heat energy, and it is difficult to significantly reduce building energy consumption. A phase change energy storage plate is a composite material of a phase change material and a building material. By absorbing or releasing heat by the phase change material at a specific temperature, energy storage and regulation are realized. Combining the phase change material with the building material can significantly improve the thermal inertia and heat storage capacity of the building, and effectively alleviate the imbalance between energy supply and demand in time and space.

[0003] The structure of the phase change energy storage plate mainly includes a phase change material, a support structure, and a packaging layer. In the existing related technologies of phase change energy storage plates, there are many problems to be solved urgently. For example, common paraffin-based phase change materials have poor thermal conductivity, resulting in slow heat transfer, low heat storage and release efficiency of the energy storage plate, and unable to meet the requirements of rapid energy conversion in practical applications. In terms of the design of the plate structure, the existing support structure and packaging layer have problems of poor thermal conductivity and affecting the overall strength of the plate. Summary of the Invention

[0004] The purpose of the present invention is to provide a phase change energy storage plate and a preparation method thereof for the problems of low heat storage and release rate and poor strength of the existing phase change energy storage plates. The phase change energy storage plate includes a front aluminum plate, a honeycomb core layer made of aluminum material, and a back aluminum plate. Through the selection of materials for the packaging layer and the honeycomb core layer, the selection of the phase change material, and the targeted adjustment of the structure of each hexagonal column phase change unit in the honeycomb core layer, with the mutual cooperation of various factors, the phase change energy storage plate achieves a high heat storage and release rate and thermal conductivity, and has a high bending strength, which is convenient for popularization and application.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: A phase change energy storage plate, comprising a front aluminum plate, a honeycomb core layer, and a back aluminum plate that are sequentially stacked and bonded by an adhesive; The honeycomb core layer is made of aluminum material and is formed by arranging a plurality of hexagonal columns in a matrix. The edge length of each hexagonal column is 2 mm to 6 mm, and the wall thickness is 0.02 mm to 0.06 mm; Each hexagonal column is filled with a phase change material, and the phase change material is at least one of a graphite-based phase change material and a microcapsule phase change material.

[0006] The phase change energy storage board provided by the present invention is composed of a front aluminum plate, a honeycomb core layer made of aluminum material, and a back aluminum plate. The honeycomb core layer is formed by arranging a number of hexagonal cylinders in a matrix form. Each hexagonal cylinder is filled with a phase change material, and the phase change material is selected from at least one of graphite-based phase change materials and microcapsule phase change materials. Through the selection of materials for the encapsulation layer and the honeycomb core layer, the selection of the phase change material, and the targeted adjustment of the phase change unit structure of each hexagonal cylinder in the honeycomb core layer, the mutual cooperation of various factors enables the phase change energy storage board to achieve a relatively high heat storage and release rate, thermal conductivity, and high bending strength, which is convenient for popularization and application.

[0007] Furthermore, the edge length of each hexagonal cylinder is 2 mm to 4 mm, and the wall thickness is 0.04 mm to 0.06 mm. It has been found that the edge length and wall thickness of the hexagonal core cells in the honeycomb core layer are key factors affecting the comprehensive performance of the board. If the edge length is too large or too small, it may lead to uneven distribution of the phase change material, thereby affecting the uniformity of heat storage and release. If the wall thickness is too thin, the strength of the board may be insufficient, while if it is too thick, it will increase the weight and cost of the board and is also not conducive to heat transfer. Most preferably, the edge length of each hexagonal cylinder is 4 mm, and the wall thickness is 0.03 mm.

[0008] Furthermore, the thermal conductivity of the graphite-based phase change material is 2 to 10 W / (m•K), and the phase change enthalpy value ≥ 180 J / g. Preferably, the thermal conductivity of the graphite-based phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 200 J / g.

[0009] Furthermore, the thermal conductivity of the microcapsule phase change material is 2 to 10 W / (m•K), the particle size is 1 - 100 μm, and the phase change enthalpy value ≥ 180 J / g. Preferably, the thermal conductivity of the microcapsule phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 250 J / g.

[0010] It has been found that by limiting the performance of the graphite-based phase change material and the microcapsule phase change material and cooperating with the structure of the honeycomb core layer, not only can a relatively high heat storage and release rate be achieved, but also the cost can be effectively controlled, which is convenient for popularization and application.

[0011] Furthermore, the thickness of the front aluminum plate is 0.2 mm to 0.4 mm; the thickness of the back aluminum plate is 0.1 mm to 0.3 mm. The front aluminum plate and the back aluminum plate are located on the outer layer of the energy storage plate, which can play a role in protection and support. At the same time, the aluminum plate has excellent thermal conductivity. When used in conjunction with the energy storage plate, it can effectively transfer heat from the external environment to the internal phase change material or conduct the heat released by the phase change material out, which also helps to improve the heat storage and heat release efficiency of the energy storage plate. Preferably, the thickness of the front aluminum plate is greater than that of the back aluminum plate. The front aluminum plate is located on the outside of the phase change energy storage plate, usually facing the heat source or the side that needs to absorb heat. Its function is to directly contact the external environment and transfer heat to the phase change material inside the energy storage plate. The back aluminum plate is located on the other side of the energy storage plate, mainly playing a role in protection and support, and can also assist in heat dissipation or heat insulation. Designing the thickness of the front aluminum plate to be greater than that of the back aluminum plate can better ensure structural stability and improve thermal conductivity efficiency.

[0012] Furthermore, a decorative layer is pasted on the outside of the front aluminum plate.

[0013] Another object of the present invention is to provide a preparation method of the above-mentioned phase change energy storage plate.

[0014] A preparation method of the above-mentioned phase change energy storage plate includes the following steps: Bond the honeycomb core layer to the back aluminum plate; Inject the phase change material into the hexagonal column body by using a porous array type injection device; Use an ultrasonic vibration platform to assist the uniform distribution of the phase change material, and use a scraper to scrape it flat until the phase change material fills to the same level as the top of the hexagonal column body; Closely bond the front aluminum plate to the side of the honeycomb core layer away from the back aluminum plate.

[0015] The preparation method of the phase change energy storage plate provided by the present invention significantly improves the performance and production efficiency of the energy storage plate by optimizing the structural design, material filling and bonding process, can meet the requirements of large-scale production, has a low cost and is convenient for popularization.

[0016] Furthermore, an ultrasonic vibration platform is used to assist the uniform distribution of the material. The ultrasonic frequency is 20 - 40 kHz, the amplitude is 10 - 30 μm, and the duration is 2 - 5 min.

[0017] Another object of the present invention is to provide an application of the phase change energy storage plate.

[0018] Application of the phase change energy storage plate as described above or the phase change energy storage plate prepared by the above-mentioned preparation method of the phase change energy storage plate in the preparation of building materials.

[0019] The phase change energy storage board provided by the present invention can achieve efficient heat storage and release. When used in building materials, it can effectively reduce building energy consumption, promote the utilization of clean energy, and the development of low-carbon buildings.

[0020] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. The phase change energy storage board provided by the present invention is composed of a front aluminum plate, a honeycomb core layer made of aluminum material, and a back aluminum plate. The honeycomb core layer is formed by arranging a number of hexagonal cylinders in a matrix form. Each hexagonal cylinder is filled with a phase change material, and the phase change material is selected from at least one of graphite-based phase change materials and microcapsule phase change materials. Through the selection of materials for the encapsulation layer and the honeycomb core layer, the selection of the phase change material, and the targeted adjustment of the phase change unit structure of each hexagonal cylinder in the honeycomb core layer, the mutual cooperation of various factors enables the phase change energy storage board to achieve a high heat storage and release rate, high thermal conductivity, and high bending strength, which is convenient for popularization and application.

[0021] 2. The preparation method of the phase change energy storage board provided by the present invention significantly improves the performance and production efficiency of the energy storage board by optimizing the structural design, material filling, and bonding process. It can meet the requirements of large-scale production, has a low cost, and is convenient for popularization.

[0022] 3. The phase change energy storage board provided by the present invention can achieve efficient heat storage and release. When used in building materials, it can effectively reduce building energy consumption, promote the utilization of clean energy, and the development of low-carbon buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the phase change energy storage board provided for Example 1.

[0024] Markings in the figure: 1 - front aluminum plate; 2 - honeycomb core layer; 3 - back aluminum plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Unless otherwise specified, in the description of the specific embodiments of the present invention, the expression terms indicating the orientation or positional relationship, such as "upper", "lower", "left", "right", "center", "inner", "outer", etc., are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / installation is commonly used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0027] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present invention.

[0028] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0029] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0030] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "connected to", "provided with", "laid", "arranged" appear, they 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 connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0031] The structure of the phase change energy storage board mainly includes a phase change material, a support structure, and a packaging layer. In the existing related technologies of phase change energy storage boards, there are many problems to be solved urgently. For example, the commonly used paraffin-based phase change materials have poor thermal conductivity, resulting in slow heat transfer, low heat storage and release efficiency of the energy storage board, and being unable to meet the requirements of rapid energy conversion in practical applications. In terms of the design of the board structure, the existing support structure and packaging layer have problems of poor heat conduction performance and affecting the overall strength of the board.

[0032] In the first aspect of the embodiments of the present application, a phase change energy storage board is provided, which includes a front aluminum plate 1, a honeycomb core layer 2, and a back aluminum plate 3 that are sequentially stacked and bonded by an adhesive; the honeycomb core layer 2 is made of aluminum material and is formed by arranging a plurality of hexagonal cylinders in a matrix form, and the edge length of each hexagonal cylinder is 2 mm to 6 mm, and the wall thickness is 0.02 mm to 0.06 mm; each hexagonal cylinder is filled with a phase change material, and the phase change material is at least one of a graphite-based phase change material and a microcapsule phase change material.

[0033] Through the selection of materials for the packaging layer and the honeycomb core layer 2, the selection of the phase change material, and the targeted adjustment of the phase change unit structure of each hexagonal cylinder in the honeycomb core layer 2, the mutual cooperation of various factors enables the phase change energy storage board to achieve a high heat storage and release rate, thermal conductivity, and high flexural strength, which is convenient for popularization and application.

[0034] In some embodiments, the edge length of each hexagonal cylinder is 2 mm to 4 mm, and the wall thickness is 0.04 mm to 0.06 mm. It is found that the edge length and wall thickness of the hexagonal core cells in the honeycomb core layer 2 are key factors affecting the comprehensive performance of the board. If the edge length is too large or too small, it may lead to uneven distribution of the phase change material, thereby affecting the uniformity of heat storage and release; if the wall thickness is too thin, the strength of the board may be insufficient, and if it is too thick, it will increase the weight and cost of the board, and at the same time, it is not conducive to heat transfer. Most preferably, the edge length of each hexagonal cylinder is 4 mm, and the wall thickness is 0.03 mm.

[0035] In some embodiments, the thermal conductivity of the graphite-based phase change material is 2 to 10 W / (m•K), and the phase change enthalpy value ≥ 180 J / g. Preferably, the thermal conductivity of the graphite-based phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 200 J / g.

[0036] In some embodiments, the thermal conductivity of the microcapsule phase change material is 2 to 10 W / (m•K), the particle size is 1 - 100 μm, and the phase change enthalpy value ≥ 180 J / g. Preferably, the thermal conductivity of the microcapsule phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 250 J / g.

[0037] It is found that by defining the properties of the graphite-based phase change material and the microcapsule phase change material and coordinating with the structure of the honeycomb core layer 2, not only a high heat storage and release rate can be achieved, but also the cost can be effectively controlled, which is convenient for popularization and application.

[0038] In some embodiments, the thickness of the front aluminum plate 1 is 0.2 mm to 0.4 mm; the thickness of the back aluminum plate 3 is 0.1 mm to 0.3 mm. The front aluminum plate 1 and the back aluminum plate 3 are located on the outer layer of the energy storage plate, which can play a role in protection and support. At the same time, the aluminum plate has excellent thermal conductivity. When used in the energy storage plate, it can effectively transfer heat from the external environment to the internal phase change material, or conduct the heat released by the phase change material out, which also helps to improve the heat storage and release efficiency of the energy storage plate. Preferably, the thickness of the front aluminum plate 1 is greater than that of the back aluminum plate 3. The front aluminum plate 1 is located on the outside of the phase change energy storage plate, usually facing the heat source or the side that needs to absorb heat. Its function is to directly contact the external environment and transfer heat to the phase change material inside the energy storage plate. The back aluminum plate 3 is located on the other side of the energy storage plate, mainly playing a role in protection and support, and can also assist in heat dissipation or heat insulation. Designing the thickness of the front aluminum plate 1 to be greater than that of the back aluminum plate 3 can better ensure the structural stability and improve the thermal conductivity efficiency.

[0039] In some embodiments, a decorative layer is pasted on the outside of the front aluminum plate 1.

[0040] A preparation method of a phase change energy storage plate includes the following steps: Bond the honeycomb core layer 2 to the back aluminum plate 3; Inject the phase change material into the hexagonal cylinders by using a porous array type injection device; Use an ultrasonic vibration platform to assist the phase change material to be evenly distributed, and use a scraper to scrape it flat until the phase change material fills to the same level as the top of the hexagonal cylinders; Closely bond the front aluminum plate 1 to the side of the honeycomb core layer 2 away from the back aluminum plate 3.

[0041] By optimizing the structure design, material filling and bonding process, the performance and production efficiency of the energy storage plate are significantly improved, which can meet the requirements of large-scale production, has a low cost, and is convenient for popularization.

[0042] In some embodiments, an ultrasonic vibration platform is used to assist the material to be evenly distributed. The ultrasonic frequency is 20 - 40 kHz, the amplitude is 10 - 30 μm, and the duration is 2 - 5 min.

[0043] In order to enable those skilled in the art to clearly understand the details and operations of the above embodiments of the present application, the above technical solutions are illustrated by the following multiple embodiments.

[0044] Example 1 Material preparation: Honeycomb core layer 2, made of aluminum material, is formed by arranging a number of hexagonal cylinders in a matrix. The edge length of each hexagonal cylinder is 4 mm, the wall thickness is 0.03 mm, and the depth is 15 mm. Graphite-based phase change material with a thermal conductivity of 6 W / (m•K) and a phase change enthalpy value of 200 J / g. The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate. The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0045] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back. Disperse the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in uniform material distribution. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, perform the bonding and compounding of the front aluminum plate 1, controlling the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0046] Example 2 Material preparation: Honeycomb core layer 2, made of aluminum material, is formed by arranging a number of hexagonal cylinders in a matrix. The edge length of each hexagonal cylinder is 2 mm, the wall thickness is 0.03 mm, and the depth is 15 mm. Graphite-based phase change material with a thermal conductivity of 6 W / (m•K) and a phase change enthalpy value of 200 J / g. The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate. The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0047] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back. Disperse the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in uniform material distribution. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, perform the bonding and compounding of the front aluminum plate 1, controlling the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0048] Example 3 Material preparation: Honeycomb core layer 2, made of aluminum material, is formed by arranging a number of hexagonal cylinders in a matrix. The edge length of each hexagonal cylinder is 6 mm, the wall thickness is 0.03 mm, and the depth is 15 mm. A graphite-based phase change material with a thermal conductivity of 6 W / (m•K) and a phase change enthalpy value of 200 J / g; The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate; The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0049] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back. Disperse the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in evenly distributing the material. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, perform the bonding and compounding of the front aluminum plate 1, control the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0050] Example 4 Material preparation: The honeycomb core layer 2, made of aluminum material, is formed by arranging a number of hexagonal cylinders in a matrix. The edge length of each hexagonal cylinder is 4 mm, the wall thickness is 0.02 mm; the depth is 15 mm; A graphite-based phase change material with a thermal conductivity of 6 W / (m•K) and a phase change enthalpy value of 200 J / g; The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate; The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0051] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back. Disperse the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in evenly distributing the material. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, perform the bonding and compounding of the front aluminum plate 1, control the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0052] Example 5 Material preparation: The honeycomb core layer 2, made of aluminum material, is formed by arranging a number of hexagonal cylinders in a matrix. The edge length of each hexagonal cylinder is 4 mm, the wall thickness is 0.06 mm; the depth is 15 mm; A graphite-based phase change material with a thermal conductivity of 6 W / (m•K) and a phase change enthalpy value of 200 J / g; The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate; The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0053] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back side. Then, disperse the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in evenly distributing the material. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, bond and compound the front aluminum plate 1, controlling the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0054] Comparative Example 1 Material preparation: The honeycomb core layer 2, made of aluminum material, is composed of a number of hexagonal cylinders arranged in a matrix form. The edge length of each hexagonal cylinder is 4 mm, the wall thickness is 0.03 mm; the depth is 15 mm; Paraffin wax (phase change enthalpy value ≥ 180 J / g); The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate; The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0055] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate on the back side. Then, disperse the phase change material into the honeycomb core through a feeding device (since the phase change material is pure paraffin wax, the feeding temperature is adjusted to 70 - 90 °C and melted into a liquid state). Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in evenly distributing the material. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, bond and compound the front aluminum plate 1, controlling the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0056] Comparative Example 2 Material preparation: The honeycomb core layer 2, made of aluminum material, is composed of a number of hexagonal cylinders arranged in a matrix form. The edge length of each hexagonal cylinder is 4 mm, the wall thickness is 0.03 mm; the depth is 15 mm; The phase change material is an inorganic hydrate: sodium sulfate decahydrate (phase change enthalpy value ≥ 180 J / g); The thickness of the back aluminum plate 3 is 0.15 mm, and its size is the same as that of the honeycomb aluminum plate; The thickness of the front aluminum plate 1 is 0.3 mm, and its size is the same as that of the honeycomb aluminum plate.

[0057] Production process: First, bond the back aluminum plate 3 to the honeycomb aluminum plate. Spread the mixed phase change material into the honeycomb core through a feeding device. Use an ultrasonic vibration platform (frequency 30 kHz, amplitude 20 μm, duration 3 min) to assist in uniform material distribution. Use a leveling tool to level the phase change material to ensure a flat surface. Finally, bond and composite the front aluminum plate 1, controlling the bonding temperature at 100 °C, the pressure at 0.5 MPa, and the bonding time at 20 min.

[0058] Comparative Example 3 Compared with Example 1, the edge length of the hexagonal columns in the honeycomb core layer 2 was changed in Comparative Example 3. The edge length was changed to 1 mm, and the remaining material preparation and production process were the same as those in Example 1.

[0059] Comparative Example 4 Compared with Example 1, the edge length of the hexagonal columns in the honeycomb core layer 2 was changed in Comparative Example 4. The edge length was changed to 8 mm, and the remaining material preparation and production process were the same as those in Example 1.

[0060] Comparative Example 5 Compared with Example 1, the wall thickness of the hexagonal columns in the honeycomb core layer 2 was changed in Comparative Example 5. The wall thickness was changed to 0.01 mm, and the remaining material preparation and production process were the same as those in Example 1.

[0061] Comparative Example 6 Compared with Example 1, the wall thickness of the hexagonal columns in the honeycomb core layer 2 was changed in Comparative Example 6. The wall thickness was changed to 0.08 mm, and the remaining material preparation and production process were the same as those in Example 1.

[0062] Performance Test: Perform charging and discharging time, heat storage density, flexural strength, and thermal cycling performance tests on the phase change energy storage plates prepared in Examples 1 - 5 and Comparative Examples 1 - 6. The test results are shown in Table 1.

[0063] Among them, the test environment temperature was controlled at 16 °C, the maximum heating temperature of the electric heating film was 60 °C, and the power was 1000 W.

[0064] Specific test method for charging and discharging time: Monitor the temperature change in the temperature measurement area of the experimental bench (6 points are arranged in each area, the temperature sensor uses a T-type thermocouple, measurement range: -40 °C to 200 °C, accuracy: ±0.5 °C, resolution: 0.1 °C. The temperature data processing uses an Agilent DAQ970A scanning detector, measurement range: -100 °C to 400 °C, accuracy: ±0.1 °C, resolution: 0.1 °C, and the temperature data is collected and recorded at a frequency of 1 time / 10 s. The heat storage time is the time from when the electric heating film starts heating to when the temperatures of the inner and outer surface measurement points of the phase change-decoration integrated layer reach equilibrium, and the heat release time is the time from when the heating ends until the temperatures of the inner and outer surface measurement points of the phase change-decoration integrated layer drop back to room temperature again.

[0065] The specific test method for the heat storage density is calculated according to the following formula:

[0066] The specific test method for the flexural strength is as follows: It is carried out according to the relevant test requirements of JG / T 334-2012.

[0067] The specific operation process of the cycle performance test is as follows: The heat and cold cycle resistance performance is carried out according to the relevant test requirements of JC / T 2338 and JC / T 2339.

[0068] Table 1

[0069] It can be seen from the data in Table 1 that by comparing the test results of Examples 1-, the size of the honeycomb core grid affects the heat storage and release rate and the flexural strength. The smaller the edge length of the honeycomb core, the larger the pore density of the honeycomb core, the more heat transfer paths can be achieved, and the greater the heat storage and release rate. At the same time, the smaller the edge length, that is, the larger the pore density, the higher the flexural strength of the composite formed plate. It can be seen from Comparative Examples 3-4 that too large or too small edge lengths will have an adverse impact on the heat storage and release rate and the flexural strength. Too small an edge length results in too fast a heat release rate, and it is impossible to achieve long-term heat preservation in the room. That is, after the heat storage is completed, the heat of the phase change material will be quickly released, and this short-term heat release behavior loses the meaning of phase change energy storage. Too large an edge length leads to a longer heat storage time and an increase in the power consumption, and it is impossible to achieve the maximum utilization of energy.

[0070] By comparing Examples 1, 4, and 5, it can be seen that the thickness of the honeycomb core wall has little effect on the heat storage and release rate, and the flexural strength increases with the increase of the wall thickness. However, from the test results of Comparative Examples 5-6, it can be seen that too small a wall thickness leads to a significant increase in the heat storage time, resulting in large energy losses and increased usage costs; too large a wall thickness leads to a significant increase in the heat release rate, resulting in the rapid release of the stored heat, and it is impossible to maintain the indoor temperature for a long time to keep the indoor temperature in the best comfortable range, losing the meaning of phase change energy storage. At the same time, too small a wall thickness results in the flexural strength not meeting the requirements, and although the flexural strength increases with too large a wall thickness, it leads to an increase in cost and weight.

[0071] Analysis of Example 1, Comparative Examples 1 and 2 shows that pure paraffin increases the heating operation in the process of preparing the sample plate, resulting in increased energy consumption. When bonding the front aluminum plate 1, the liquid paraffin will cause gaps or defects in the bonding between the aluminum panel and the honeycomb core on the surface of the honeycomb core grid, leading to leakage problems during the cycling process (in the 500-cycle test, the heat storage density decreased by 11%); during the cycling process of inorganic hydrates, the hydrated salts lose water, resulting in a decrease in the heat storage density (in the 500-cycle test, the heat storage density decreased by 27%). In addition, the heat storage and release rate (thermal conductivity efficiency) of the composite plates formed by these two materials is significantly lower than that of the composite plates filled with high thermal conductivity graphite phase change materials.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A phase change energy storage board, characterized in that, It includes a front aluminum plate, a honeycomb core layer, and a back aluminum plate that are sequentially stacked and bonded by an adhesive; The honeycomb core layer is made of aluminum material and is formed by arranging a number of hexagonal cylinders in a matrix form. The edge length of each hexagonal cylinder is 2 mm to 6 mm, and the wall thickness is 0.02 mm to 0.06 mm; Each hexagonal cylinder is filled with a phase change material, and the phase change material is at least one of a graphite-based phase change material and a microcapsule phase change material.

2. The phase change energy storage plate according to claim 1, wherein The edge length of each hexagonal cylinder is 2 mm to 4 mm, and the wall thickness is 0.04 mm to 0.06 mm.

3. The phase change energy storage plate according to claim 1, characterized in that, The thermal conductivity of the graphite-based phase change material is 2 to 10 W / (m•K), and the phase change enthalpy value ≥ 180 J / g.

4. The phase change energy storage plate according to claim 3, wherein The thermal conductivity of the graphite-based phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 200 J / g.

5. The phase change energy storage plate according to claim 1, wherein The thermal conductivity of the microcapsule phase change material is 2 to 10 W / (m•K), the particle size is 1 - 100 μm, and the phase change enthalpy value ≥ 180 J / g.

6. The phase change energy storage plate according to claim 5, wherein, The thermal conductivity of the microcapsule phase change material is 5 to 8 W / (m•K), and the phase change enthalpy value is 180 to 250 J / g.

7. The phase change energy storage plate according to any one of claims 1-6, characterized in that, The thickness of the front aluminum plate is 0.2 mm to 0.4 mm; the thickness of the back aluminum plate is 0.1 mm to 0.3 mm.

8. The phase change energy storage plate according to claim 7, wherein The thickness of the front aluminum plate is greater than that of the back aluminum plate.

9. A preparation method of a phase change energy storage plate according to any one of claims 1-8, characterized in that, It includes the following steps: Bond the honeycomb core layer to the back aluminum plate; Inject the phase change material into the hexagonal cylinder by using a porous array type feeding device; Use an ultrasonic vibration platform to assist the uniform distribution of the phase change material, and use a scraper to scrape it flat until the phase change material fills up to the top of the hexagonal cylinder; Bond the front aluminum plate tightly to the side of the honeycomb core layer away from the back aluminum plate.

10. The application of the phase change energy storage plate described in any one of claims 1 - 8 or the phase change energy storage plate prepared by the preparation method of the phase change energy storage plate described in claim 9 in the preparation of building materials.

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