352 results about "Composite phase change material" patented technology

The invention discloses a building composite phase change material intelligent matching and optimizing method based on a large language model, and belongs to the technical field of building energy saving and intelligent material design. Basic thermophysical property data, building environment parameter data and user demand data are collected; a deep reinforcement learning technology is utilized to construct an intelligent model based on a deep Q network strategy, and generated data samples are integrated into a thermophysical property database; outputting a candidate material combination recommendation scheme by adopting a large language model; evaluating the candidate material combination recommendation scheme by using the semantic tag vector and a sorting engine to obtain a performance evaluation result; generating a performance evaluation report according to the simulation model; a multi-agent negotiation algorithm is adopted, cross-regional thermal control performance is optimized, a multi-dimensional performance comparison diagram and tuning suggestions are generated, correction information of designers is recorded, optimization is carried out, and feedback is provided in a self-adaptive mode. According to the method, the building composite phase change material combination is screened, cross-regional thermal control is optimized, adaptive schemes and suggestions are output, and the self-adaptive optimization capability of the system is improved.

The invention relates to the technical field of power system optimization scheduling, and provides a multi-time-scale new energy-stored energy joint output optimization method and system based on spot price, so as to solve the problems of poor system operation stability and low new energy regulation and control precision in the prior art. The method comprises the following steps: detecting a temperature change rate of a composite phase change material in an energy charging and discharging process to determine a heat storage capability state of an energy storage unit, and generating a day-ahead joint scheduling plan considering operation cost and a new energy consumption rate in a coordinated optimization framework by combining day-ahead electricity price data; constructing an elastic matrix based on historical electricity consumption data, correcting the elastic matrix by using latest market information and a system state, and determining a load adjustment amount in combination with an intraday electricity price; and based on the real-time electricity price and the load adjustment amount, a model prediction control algorithm is adopted to calculate real-time output adjustment instructions of the new energy unit and the energy storage unit in a rolling manner, and the operation states of the two units are synchronously adjusted to realize collaborative optimization. The system operation stability and the new energy regulation and control precision are improved.

The invention discloses a diaphragm and an electrochemical device, and belongs to the field of electrochemical energy storage. The diaphragm is used for the electrochemical device and comprises a base membrane and a coating arranged on one side or two sides of the base membrane in the thickness direction, the coating comprises a composite phase-change material, the composite phase-change material comprises a conductive polymer layer and a tubular material, the conductive polymer layer partially or completely coats the surface of the tubular material, and the tubular material is coated with the conductive polymer layer. A phase change material is contained in the tube of the tubular material. According to the diaphragm, the high-temperature thermal safety performance of the diaphragm can be improved under the condition that the high-temperature mechanical performance of the diaphragm is not damaged.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention belongs to the technical field of phase change materials, and particularly relates to an erythritol and fumed silica composite phase change material and a preparation method thereof.The preparation method comprises the following process steps that fumed silica and erythritol are mixed according to the mass ratio of 10: 90-30: 70, and a mixture is obtained; heating the mixture at 130-160 DEG C for 2-4 hours, and stirring for 5 minutes every 30 minutes in the heating process; the heated mixture is subjected to dipping treatment under the vacuum condition, and composite phase change material powder is obtained; the composite phase-change material powder is subjected to compression molding under the pressure of 3-5 MPa, the pressure is maintained for 3-7 minutes, and the erythritol fumed silica low-heat-conductivity shaped composite phase-change material is obtained, the problem of phase-change material leakage is solved, the packaging cost is reduced, meanwhile, the heat conductivity of the phase-change material can be reduced, the phase-change material has the heat insulation and heat storage capacity, and the thermal conductivity of the phase-change material is improved. The application in the field of thermal protection is facilitated.

The invention discloses a thermal management system based on double-layer phase change and air cooling cooperative heat dissipation. The system comprises a battery module, a first-stage phase change layer, a second-stage phase change layer, a binding post, a supporting plate, a sleeve and an air cooling channel. The double-layer phase-change cooling device is filled with two composite phase-change materials with high heat conductivity coefficients, and the composite phase-change materials are distributed in the radial direction, so that heat generated by the battery can be quickly absorbed, and the temperature in the battery module is kept uniform. And when the power battery module operates for a preset time length, the air cooling device is automatically started, and part of heat absorbed by the phase change device is dissipated to the environment. The air cooling system adopts a square wave type air supply strategy, that is, intermittent cooling airflow is provided by periodically starting and stopping a fan. By combining the double-layer phase change cooling and air cooling technology, the problems of non-uniform internal temperature distribution and local overheating of the battery module are effectively improved, the applicable working condition range of the battery module is expanded, and the stability and reliability of the system are improved.

The invention provides a high-thermal-conductivity glass fiber reinforced phase change laminated plate and a preparation method thereof.The preparation method comprises the steps that S1, expanded graphite and molten n-octadecane are mixed and then subjected to vacuum impregnation treatment, then molten n-alkane is added, and a second composite phase change material is obtained; s2, carrying out single-side modification on the glass fiber cloth by using a silane coupling agent, and coating the modified surface of the single-side modified glass fiber cloth with a second composite phase change material to form a temperature control coating; s3, mixing modified nano silicon dioxide, polyurethane acrylic resin and a silane coupling agent, and then coating the unmodified surface of the single-surface modified glass fiber cloth with the mixture to obtain double-surface modified glass fiber cloth; and S4, symmetrically overlapping the two layers of double-sided modified glass fiber cloth, and performing hot-pressing compounding to obtain the high-thermal-conductivity glass fiber reinforced phase change laminated plate. The problems of liquid phase leakage and low thermal conductivity of the phase change material are effectively solved through the synergistic enhancement effect of the expanded graphite and the glass fibers and the design of the barrier coating.

The copper-based composite phase change material photovoltaic energy storage and cooling coupled system and method covers power generation, cooling energy storage, energy conversion and other modules. During the day, the solar photovoltaic panel generates heat, the copper-based composite phase change material absorbs heat and stores energy and cools the photovoltaic panel; at night, the phase change material releases heat, and the thermoelectric material converts thermal energy into electrical energy. The system uses the DDPG algorithm of deep reinforcement learning to optimize operation. The state space includes solar photovoltaic panel temperature, phase change material temperature and other parameters, and the action space involves controlling cooling energy storage, energy conversion and other operations. The reward function is designed from multiple aspects such as efficiency, energy storage, power output and stability. By constructing a policy network and a value network, the system can make decisions according to environmental changes. Data is extracted from the experience replay buffer to update network parameters, allowing the system to adaptively adjust. The system not only solves the problem of high temperature of photovoltaic panels and night power generation, but also uses algorithms to improve energy utilization efficiency, which is far superior to traditional photovoltaic systems in performance.

The invention relates to the technical field of comprehensive utilization of solar energy, in particular to a photovoltaic heat combined supply self-adaptive heat flow control system and a control method thereof, a photovoltaic-heat-storage-diagnosis integrated module is composed of a photovoltaic layer, a micro-channel heat exchange layer, a heat storage unit, a self-diagnosis unit and an intelligent control unit, based on illumination intensity, assembly temperature, fluid flow, environment humidity and wind speed data, the flow velocity of a cooling medium is dynamically adjusted through an algorithm fusing model predictive control and deep reinforcement learning, and the controller adopts a multi-core heterogeneous processor and supports OTA remote upgrade and standardization module interfaces. Through the collaborative design of the double-sided power generation assembly and the composite nanofluid and in combination with an intelligent heat flow control strategy, the temperature of the photovoltaic assembly is stabilized within the optimal interval of 25-40 DEG C, and the power generation efficiency is improved by 15-30% compared with that of a traditional system; and the heat storage unit adopts a paraffin-based / carbon nanotube composite phase change material, and is matched with a three-stage waste heat recovery system, so that the breakthrough improvement of the comprehensive utilization rate of solar energy is realized.

The invention discloses a high-temperature composite phase change heat storage material and a preparation method thereof, and belongs to the technical field of composite phase change heat storage materials. The composite phase change material comprises a matrix and a phase change material, the base body is porous ceramic, and the porous ceramic comprises a lining with a porous structure and a surface layer with a porous structure; compared with the pore diameter of the lining, the pore diameter of the surface layer is smaller; the high-temperature salt in a molten state can enter the inside through small holes in the surface layer; the surface layer can avoid leakage of high-temperature salt in a molten state, and the lining provides a storage and phase change space for the high-temperature salt; the porosity of the lining is larger than that of the surface layer, and the phase change material comprises high-temperature salt.

The application provides an octadecane-loaded cellulose-based composite phase change material evaporator and a preparation method and application thereof in seawater desalination, and belongs to the fields of photo-thermal conversion materials and separation technologies. Nanocellulose and polyvinyl alcohol are mixed to prepare an aerogel, octadecane is encapsulated in the pores of the aerogel by a vacuum impregnation method to obtain a composite phase change material aerogel, and the composite phase change material aerogel is coated with a non-woven fabric loaded with polypyrrole to obtain the octadecane-loaded cellulose-based composite phase change material evaporator. The evaporator is a composite phase change material evaporator based on the coupling of interfacial evaporation and phase change energy storage, solves the problems of discontinuous evaporation and low solar energy utilization rate caused by day and night alternation, has excellent light absorption performance, good heat insulation performance and sufficient water supply and the like, can be used for seawater desalination, and has the advantages of high evaporation rate, high energy conversion efficiency, salt precipitation prevention and the like.

The invention discloses a heavy-load hydrogen-electricity hybrid power system of an industrial unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles, the core comprises a fuel cell, a lithium battery pack, a driving motor and three modules, the fuel cell and the lithium battery pack are connected in parallel with the driving motor, and a dynamic variable liquid cooling system is thermally connected with the fuel cell. The intelligent mission profile prediction module and the liquid cooling system are both in signal connection with the thermal-electric collaborative optimization controller, the prediction module receives data such as an air route and weather, simulates a flight state in a future time period through a model, and outputs predicted power and a temperature curve; the liquid cooling system comprises at least two independent heat dissipation partitions and is integrated with a paraffin-based composite phase change material, the optimization controller outputs optimal parameters through a task-adaptive multi-objective optimization function based on a prediction curve and real-time data, and the system is provided with a data acquisition module, a hydrogen supply control module and a fault early warning module to realize data monitoring, hydrogen supply stability and safety early warning. And the load, endurance and reliability are improved.

A device having: a multilayer composite phase change material structure with: a bottom PCM layer of a first SbTe PCM material having a first metallic doping; a first composite PCM layer on the bottom PCM layer, wherein the first composite PCM layer comprises at least: a first composite layer, comprising said first PCM material having a second metallic doping; and a second composite layer, comprising said first SbTe PCM material undoped, on the first composite layer; and a top PCM layer, comprising first SbTe PCM material having said first metallic doping, on the composite PCM layer. The first metallic doping can be identical to the second metallic doping. The first PCM material can comprise SbTe and the first and second metallic dopings can comprise one of Ge, In and GeIn.

The invention belongs to the technical field of phase change concrete, and particularly relates to a preparation method of composite phase change concrete. The invention provides a composite phase change aggregate. The composite phase change aggregate comprises a porous adsorption material, a composite phase change material and a packaging material, the porous adsorption material comprises expanded vermiculite; the composite phase change material comprises methyl palmitate (MP) and methyl stearate (MS); the packaging material comprises epoxy resin or styrene-acrylic emulsion. The composite phase change aggregate has excellent phase change temperature and latent heat of phase change, still has good thermal stability after multiple cycles, and meanwhile, the composite phase change aggregate replaces fine aggregate to be used for preparing concrete, and the prepared concrete shows good phase change cycle strength stability and heat conduction stability.

The invention relates to a halogen-free flame-retardant flexible bending-resistant low-voltage power cable and a manufacturing method thereof. An insulating layer of the cable is made of a core-shell type nano composite phase change material, a core layer is made of a polyethylene glycol / paraffin phase change material, a shell layer is made of polyurethane or modified polyamide nano fibers and nano SiO2 particles, and the cable is prepared by adopting a coaxial electrostatic spinning technology. According to the structure, stress can be effectively dispersed when the cable is bent, crack propagation is reduced, the temperature is adjusted through the phase change material, and local overheating is prevented. The three-dimensional network structure enhances the bending resistance of the cable, the bending life is prolonged by 40%-60%, and the halogen-free flame retardant performance is ensured at the same time. The technology realizes collaborative optimization of temperature adjustment, stress buffering and bending resistance, and is suitable for power cables with high requirements.

The invention discloses a composite phase change material containing a directional hierarchical pore heat conduction network and a preparation method thereof.The method comprises the steps that an aqueous solution of polyamic acid salt, an aqueous solution of graphene oxide and modified expandable graphite flakes are mixed and then subjected to directional freezing and freeze drying, and a porous network framework is prepared; sequentially carrying out imidization, thermal expansion and graphitization treatment on the porous network skeleton in an inert atmosphere to prepare a graphite-based directional hierarchical pore network skeleton; and under vacuum, dipping the graphite-based directional hierarchical pore network skeleton in the phase change material to prepare the composite phase change material containing the directional hierarchical pore heat conduction network. By modifying expandable graphite flakes to optimize dispersibility and combining ice crystal template induced assembly and a controllable expansion process, an axial ordered heat conduction network and a porous synergistic confinement structure are constructed, the heat conduction and heat storage efficiency of the material is effectively improved, capillary adsorption of multi-scale apertures is utilized, and the heat storage efficiency of the material is improved. And the leakage problem of the solid-liquid phase change material is effectively solved.

The invention relates to the technical field of phase-change materials, and discloses a light-operated composite phase-change material catalyst and a preparation method and application thereof, and a light-operated phase-change composite material is a paraffin-encapsulated metal M / halloysite / sodium alginate composite phase-change material; according to the metal M / halloysite / sodium alginate composite phase change material for packaging the paraffin, halloysite / sodium alginate aerogel loaded by metal M nanoparticles is used as a supporting material, and the paraffin is packaged in the metal M / halloysite / sodium alginate composite phase change material. According to the invention, the metal M / halloysite / sodium alginate composite phase change material for packaging paraffin is prepared by using the halloysite nanotube, the aerogel in the invention has a relatively large paraffin encapsulation amount, the encapsulation efficiency can reach up to 86%, and the phase change material can still maintain good mechanical and chemical stability after multiple heat absorption and release cycles. The melting and solidification of paraffin in the composite phase change material are controlled by turning on and turning off the light source, and the exposure and shielding of active sites are realized, so that the catalytic reaction is accurately started and stopped, and the complete starting and pausing of the reaction are realized.

The invention discloses a preparation method of a composite phase change material, a thermal-insulation and antibacterial fabric and a preparation method thereof, and belongs to the field of functional textile fabrics and preparation thereof. The composite phase change material provided by the invention can be applied as a coating finishing component, and the preparation method comprises the following steps: taking polystyrene microspheres as a core, and forming a composite precursor through dopamine self-polymerization coating; and compounding the composite precursor with a layered double-metal hydroxide, and calcining to obtain the carbon microsphere supported layered double-metal oxide material with a hollow structure, and mixing the carbon microsphere supported layered bimetal oxide material with paraffin, and loading to obtain the carbon microsphere supported layered bimetal oxide material. The textile fiber fabric provided by the invention has excellent thermal insulation and antibacterial characteristics, is good in comfort, and has wide application prospects in industrial production and clothing application.

The invention provides a battery pack with a phase-change material, which comprises: an accommodating frame, the top of which is open and the interior of which is provided with an accommodating space; the plurality of batteries are arranged at intervals along the longitudinal direction of the accommodating frame; the plurality of first isolation plates are arranged in the accommodating space at intervals; wherein the first isolation plate is arranged between any two adjacent batteries, and the first isolation plate is made of a shaped composite phase change material, so that the phase change temperature of the first isolation plate is 24-30 DEG C, and the latent heat of phase change is 160-200kJ / kg. Excess heat is absorbed through the first isolation plate and released when needed, the heat is effectively transmitted to the external environment, and it is ensured that the whole battery pack is maintained within the optimal working temperature range. Therefore, accurate control of the temperature of the battery is realized, and the performance and the safety of the battery are remarkably improved.

The invention relates to the technical field of thermal control of spacecrafts, and discloses a satellite battery phase change thermal control system based on Joule thermal effect and high-orientation heat conduction framework cooperative regulation, and the system is characterized in that a resistance heating unit, a high-orientation graphene heat conduction framework and a composite phase change material are tightly coupled; and bidirectional temperature adjustment of the spaceflight lithium ion battery in an extreme temperature environment is realized. When the battery needs to be heated at low temperature, the resistance wire is electrified to generate heat, the heat is quickly and uniformly diffused by virtue of ultrahigh thermal conductivity in the oriented graphene film surface, and a heating network is constructed; when heat dissipation is needed at high temperature, the composite phase change material absorbs heat and stores energy through solid-liquid phase change, and the high-orientation heat conduction framework guides heat to be directionally conducted to the water cooling plates on the two sides, so that a heat dissipation channel is formed. By means of the synergistic effect of electric-heat conversion and directional heat conduction, rapid uniform-temperature heating and directional dredging heat dissipation of the battery are achieved, the problem that a traditional aviation lithium battery is low in heat management efficiency is solved, and the temperature adaptability and working stability of a battery system are improved.

The invention belongs to the technical field of heat storage systems in solar heating systems, and particularly relates to a composite phase change material and a preparation method and application thereof. The composite phase change material is prepared from the following components in percentage by mass: 4% of expanded graphite, 1%-5% of modified expanded graphite and the balance of 1-octadecanol, totaling 100%, the modified expanded graphite is expanded graphite modified by an aluminate coupling agent. Through the synergistic effect of the modified expanded graphite and the expanded graphite, the heat transfer performance of the composite phase change material can be effectively improved; after 200 times of thermal cycles, the phase change temperature and phase change latent heat of the composite phase change material are almost unchanged, and the composite phase change material shows good thermal cycle stability.

The invention discloses a photovoltaic photo-thermal hydrogen production and energy storage system based on nanofluid and a phase change material, and relates to the technical field of photovoltaic photo-thermal hydrogen production and energy storage, the system comprises a photovoltaic photo-thermal assembly, a water tank, a solar heat collector and a PEM electrolytic bath; the photovoltaic photo-thermal assembly comprises a photovoltaic cell, a first thermoelectric generator, a nanofluid channel and a composite phase change material which are arranged from top to bottom. The solar heat collector comprises a second thermoelectric generator, a water fluid channel and a composite phase change material which are arranged from top to bottom; mixed nanofluid in the nanofluid channel enters a heat exchange coil in the water tank for heat exchange; water in the water tank firstly enters a water fluid channel of the solar heat collector to be preheated and then enters the PEM electrolytic bath; the mixed nanofluid is composed of BN, MWCNT nanoparticles and pure water; the composite phase change material is composed of BN, MWCNT nanoparticles and paraffin. Efficient output of heat energy, electric energy and hydrogen energy can be achieved.

The invention discloses a heat dissipation structure of a high-power photovoltaic module. The heat dissipation structure is a heat management module mounted on the back of the photovoltaic module and comprises a sealed box body and a composite phase change material filled in the sealed box body. In order to perform differentiated management on uneven heat on the back of the assembly, the composite phase change material is divided into at least two areas: a first heat management area corresponding to a junction box serving as a core hot area and a second heat management area covering other conventional hot areas. The first thermal management area is filled with a first composite phase change material composed of gradient pore foam metal and a paraffin-based phase change material; the second thermal management area is filled with a second composite phase change material composed of expanded graphite and a paraffin-based phase change material. The box body part containing the first heat management area is of a surrounding structure to adapt to the protruding junction box, and cooling fins are arranged on the outer surface of the box body. According to the invention, high-efficiency passive thermal management is realized, the working temperature of the module can be obviously reduced, and the cost is controllable.

The invention discloses a preparation method and application of a composite phase change material functional current collector, and relates to the technical field of functional current collectors. The composite phase change material obtained by compounding polyethylene glycol, graphene oxide, hydroxypropyl methyl cellulose and polyethyleneimine is roller-coated on the surface of the current collector, and is applied to a battery material to realize thermal management at high and low temperatures; the preparation method comprises the following specific steps: mixing and heating graphene oxide and polyethyleneimine to obtain polyethyleneimine modified graphene oxide, heating and melting polyethylene glycol, adding hydroxypropyl methyl cellulose, stirring, adding the polyethyleneimine modified graphene oxide, and continuously stirring to obtain the composite phase change material.

The invention provides an inorganic salt / carbon aerogel composite phase change material and a preparation method thereof, and belongs to the technical field of phase change material preparation. The composite phase change material is prepared through electrochemical stripping, HF etching, freeze drying, high-temperature carbonization and vacuum impregnation. The electrochemical exfoliated graphene and the TiC / carbon aerogel are combined together through self-assembly to construct a heterogeneous interface and increase effective nucleation sites, so that the energy potential barrier of phonon scattering and nucleation is reduced, and the thermal conductivity is improved while the degree of supercooling is reduced; the aerogel adsorbing the inorganic salt phase change material forms hydrogel with a compact network through self-assembly, crystallization of the hydrated salt is promoted, and the hydrated salt inorganic phase change material is limited in a porous material by utilizing the confinement effect of a nano material, so that the hydrated salt inorganic phase change material is not easy to leak, and relatively good latent heat is maintained.

The invention discloses a phase-change radiation refrigeration coating which is prepared by the following steps: dispersing nano aluminum oxide particles in phase-change paraffin in advance to form a high-thermal-conductivity and high-radiation composite phase-change material, and encapsulating the high-thermal-conductivity and high-radiation composite phase-change material in a porous ceramic skeleton through vacuum infusion to obtain composite phase-change ceramic particles; then, the composite phase-change ceramic particles are dispersed in polyol resin containing aluminum oxide microspheres, the aluminum oxide microspheres accurately block pores in the surface of the porous ceramic through particle size matching, paraffin leakage is prevented, and the aluminum oxide microspheres serve as heat conduction channels and radiation units at the same time, so that it is guaranteed that the finally prepared coating integrates phase-change temperature control, efficient heat conduction and radiation refrigeration; the high sunlight reflectivity (94%-98%) and the high atmospheric window infrared emissivity (92%-96%) are achieved, and the thermal response rate and the leakproof performance are remarkably improved.

The invention discloses a method for preparing a macroscopic radial anisotropic qualitative composite phase-change material, which is used for preparing the qualitative composite phase-change material with ultrahigh heat conductivity along the radial direction through specific mold design and process flow. The method comprises the steps of building a radial mold, fixing a high-thermal-conductivity graphite film, preparing a qualitative phase-change material melt, pouring and preparing the qualitative phase-change material melt, demolding, taking out the composite phase-change material and the like. The macroscopic radial anisotropic qualitative composite phase change material prepared by adopting the continuous and dense high-thermal-conductivity graphite film without any pore structure has ultrahigh thermal conductivity along the radial direction of the radiation, and the radial equivalent thermal conductivity can reach 18 W / (m.K) level; the phase-change heat dissipation material is suitable for the phase-change heat dissipation technology of electronic equipment with a local heat source, especially a linear heat source, can effectively solve the technical problem that an existing phase-change material is low in heat conductivity in the radiation direction, improves the heat dissipation efficiency and prevents thermal failure of the equipment.

This invention discloses a phase change cold storage refrigerated truck and system, belonging to the field of cold chain logistics transportation equipment technology. The invention aims to solve the problem of balancing energy consumption, emissions, temperature stability, and operational flexibility in existing refrigerated trucks. Key technical features include: an insulated truck body, a modular phase change cold storage system integrated into the truck body roof, a combined cooling and charging system, and an intelligent control system. The cold storage unit employs graded composite phase change materials and an embedded enhanced heat transfer structure, achieving high-density energy storage and uniform cold release. The refrigeration system integrates conventional truck body cooling with rapid charging of the cold storage unit through valve switching. The intelligent control system automatically and seamlessly switches between pure cold storage, hybrid cooling, pure mechanical refrigeration, and rapid charging modes based on multi-dimensional sensor information. This invention achieves significant energy savings and carbon reduction, high-precision temperature control within ±0.5℃, ultra-low noise operation, and multi-scenario adaptive capabilities, demonstrating superior overall performance.

The invention relates to the technical field of preparation of phase change materials, and discloses a preparation method of a high-stability double-framework composite phase change material. The preparation method comprises the following steps: firstly, dissolving resorcinol in deionized water, adding hexadecyl trimethyl ammonium bromide, stirring and dissolving, then adding a formaldehyde solution, fully mixing, and reacting in a drying oven to prepare phenolic resin; then, carrying out high-temperature carbonization on phenolic resin in a tubular furnace to obtain phenolic resin carbide with a porous structure; then, enabling the carbonized phenolic resin to adsorb phase-change materials such as paraffin in a molten state through a vacuum impregnation method, and after adsorption is completed, crushing the carbonized phenolic resin into fine powder; and finally, mixing the powder with high-molecular polymers such as epoxy resin, and performing curing reaction to form a double-framework composite structure. According to the invention, a double-support system is constructed through the synergistic effect of a phenolic resin carbide skeleton and a high-molecular polymer skeleton, so that the thermal stability and the shape retention capability of the phase-change material are remarkably improved, and the problems that a traditional phase-change material is easy to leak and poor in cycle performance are effectively solved. The obtained composite phase change material has important application value in the heat energy storage fields of building energy saving, waste heat recovery and the like.

The invention discloses a leakproof composite phase change material and application of the leakproof composite phase change material in wide temperature range operation of a lithium battery, and belongs to the technical field of battery thermal management. Boron nitride nanosheet modified ceramic fibers are used as an internal supporting framework to enhance thermal conductivity and provide capillary constraint, and a core material is a phase change medium such as paraffin or n-octadecane; the invention further discloses a preparation method of the composite material and application of the composite material in lithium battery thermal management, the composite material solves the problems that a traditional phase change material is prone to leakage, poor in heat conduction and single in function, the battery can be rapidly heated at low temperature, heat can be efficiently absorbed and diffused at high temperature / normal temperature and high rate, and the service life of the battery is prolonged. The safe, efficient and stable operation of the lithium battery in a wide temperature range is realized, the leak-proof performance is high, the cycling stability is good, the preparation cost is controllable, and the application prospect is wide.