216 results about "Composite phase change material" patented technology

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 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 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.

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 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 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.

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 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.

The invention belongs to the field of glass, and particularly relates to carbon black-containing sandwich type energy storage heating glass which comprises first substrate glass, a first bonding layer, a carbon black photothermal conversion layer, a phase change energy storage layer, a second bonding layer and second substrate glass which are sequentially stacked, the carbon black photothermal conversion layer contains silane coupling agent modified carbon black; the phase change energy storage layer comprises a microencapsulated composite phase change material and a porous silicon dioxide carrier, and a phase change material in the microencapsulated composite phase change material comprises paraffin and stearic acid. The energy storage heating glass provided by the invention is low in production cost, good in light transmittance and photothermal conversion efficiency, and strong in stability and weather resistance.

The present application relates to the technical field of energy storage equipment protection, and particularly relates to a phase change protective coating for an energy storage container and a preparation method thereof, which comprises, by total mass 100 parts, epoxy modified polyurethane 40-50 parts, lauric acid 10-15 parts, paraffin 5-8 parts, GPTMS modified boron nitride 3-6 parts, VTES modified nano-silicon dioxide 2-5 parts, leveling agent 0.5-0.7 parts, defoaming agent 0.3-0.5 parts, curing agent 7-9 parts, and diluent 10.8-17 parts; the GPTMS modified boron nitride is obtained by modifying 50 nm boron nitride with GPTMS and has a modification degree of 85%, and the VTES modified nano-silicon dioxide is obtained by modifying 30 nm nano-silicon dioxide with VTES and has a modification degree of 80%. The present application uses specific composite phase change materials and cooperates with a pretreatment process, so that the phase change components are uniformly dispersed, the problems of leakage and agglomeration are avoided, the stable phase change function of the coating is ensured, the environmental temperature fluctuation can be effectively smoothed, and stable operating temperature conditions are provided for the energy storage equipment.

The invention discloses a battery pack thermal management system and a temperature control method, and relates to the technical field of battery pack thermal management, and the battery pack thermal management system comprises a composite phase change material layer, a micro-channel heat transfer network, a temperature monitoring and auxiliary temperature adjusting system and an intelligent control system. According to the battery pack heat management system and the temperature control method, through cooperation of the composite phase change material, the enhanced heat transfer structure and intelligent regulation, the temperature of the battery cell is stabilized at 25 + / -2 DEG C in the working environment of-30 DEG C to 50 DEG C, the temperature difference is smaller than or equal to 2 DEG C, the temperature is reduced by 60-70% compared with that of traditional liquid cooling, the normal-temperature auxiliary energy consumption is smaller than 1% of the battery capacity, the energy consumption in the whole working condition is reduced by 40-50%, and the working efficiency is improved. The composite phase-change material covers the range of-10 DEG C to 55 DEG C, so that starting is carried out for only 5 minutes at the low temperature of-30 DEG C, the cycle life of the battery cell is prolonged by 30-50% through global constant temperature, the volume ratio of the phase-change material is 30%, leakage is avoided, the structure is compact and safe, and the strict requirement of a counterweight card is met.

The application discloses bentonite-regulated solar-driven light-heat-electricity conversion composite phase change material and a preparation method and application thereof, and relates to the technical field of phase change energy storage materials and solar energy utilization. The material is prepared by using bacterial cellulose aerogel as a porous framework, fixing MXene and TiN nanoparticles on the framework through cross-linking and gradient assembly to construct a light-heat-heat conduction network, dispersing bentonite intercalation in a polyethylene glycol matrix to form a composite phase change material, and then encapsulating the composite phase change material in the multistage pores of the aerogel. The surface of the framework has a hydrophobic modification layer. The preparation method comprises the steps of etching, aerogel framework construction, vacuum impregnation encapsulation and hydrophobic modification. The material has high light-heat conversion efficiency, high heat conduction promotion rate, excellent leakage prevention performance, fast crystallization characteristics and super-hydrophobic self-cleaning ability. When the material is combined with a thermoelectric power sheet, a solar light-heat-electricity conversion system can be constructed, and the material has a wide application prospect in the field of renewable energy.

The invention discloses a self-repairing heat dissipation wheel based on a double-response intelligent material and a preparation process thereof, the wheel adopts a three-layer gradient composite structure and a double-trigger control system, and the three-layer structure comprises a self-repairing layer, a transition interface layer and a heat dissipation layer from outside to inside; the surface of the self-repairing layer is provided with a diamond dot matrix, and the inner side of the self-repairing layer is provided with a heating sheet; the transition interface layer is formed by explosive welding of titanium and aluminum; the heat dissipation layer comprises an aluminum alloy base body, a composite phase change material, a directional heat dissipation micro-channel, heat dissipation fins and a micro electromagnetic valve. The double-trigger system comprises a sensing module, a control module and a power supply module. The preparation technology comprises the steps of alloy preparation, explosive welding, heat dissipation structure machining, vacuum diffusion welding, phase change material vacuum infusion, function integration and the like. Micro-damage self-repairing and efficient heat dissipation are achieved, it is guaranteed that the structure is stable and matched with working conditions, the service life of wheels is prolonged, driving safety is improved, and light weight and high strength are both considered.

The application discloses a battery pack thermal management method for multi-element dynamic thermal load based on multi-objective optimization, calibrates a high-precision heat generation model, optimizes a composite phase change material with high enthalpy and high thermal conductivity and a lotus leaf configuration liquid cooling plate, balances a prediction accuracy and a calculation efficiency of an agent model, introduces a core optimization objective function set of a worst activation criterion, adopts an initialization strategy and a cross variation mechanism for adaptively locking a parameter reasonable search space, solves a multi-objective optimization model based on an improved adaptive genetic algorithm, obtains a corresponding Pareto front solution set, and further combines a TOPSIS decision method to determine optimal configurations of key parameters such as a phase change layer thickness, a liquid cooling flow channel width, an inlet flow velocity and a system delay time, so that the battery pack can be controlled in a complex thermal environment to realize thermal safety and temperature uniformity control with the lowest energy consumption.

This invention discloses a micron-sized graphite microsphere-based composite phase change material and its preparation method. This invention relates to the field of phase change material technology. The preparation method includes the following steps: S1, dispersing nano-graphite and nano-cellulose in deionized water and then ball-milling to obtain a nano-graphite-cellulose mixed solution; S2, using an electronic atomizer to spray the nano-graphite-cellulose mixed solution into a container filled with liquid nitrogen, then sieving the microspheres in the container and freeze-drying the microspheres to obtain micron-sized graphite microspheres; S3, immersing the micron-sized graphite microspheres in molten phase change material for a period of time and then hot-filtering to obtain the micron-sized graphite microsphere-based composite phase change material. In this invention, by ball-milling nano-graphite and nano-cellulose and then spraying the prepared microspheres using an electronic atomizer, a micro-aerogel porous structure is formed, which better absorbs phase change material, significantly improving heat storage capacity and thermal conductivity, and maintaining a high phase change enthalpy value even after multiple cycles.

The application relates to a rigid-flexible conversion composite phase change material suitable for battery thermal management and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The rigid-flexible conversion composite phase change material is composed of n-octadecane 70-90 wt%, polymer high molecular fixed phase change support material 5 wt% and expanded graphite 10%-25% in percentage by mass. The rigid-flexible conversion composite phase change material is stable in shape, can be converted between rigid materials and flexible materials with the change of temperature, can be used for heat preservation of lithium batteries in cold environments, and the required cold start time is shorter after the automobile is parked in the cold environment for a long time. The synthesis process of the material is simple, the material is convenient to apply, and the material has a wide application prospect.

The invention discloses a foamy copper-based phase change thermal interface material as well as a preparation method and application thereof, and belongs to the technical field of thermal interface materials. The material comprises a heat-conducting framework and a composite phase-change material, and the composite phase-change material is filled in the heat-conducting framework. According to the composite phase-change material, a three-dimensional network structure is formed through molecular chain entanglement of polymer resin and paraffin, the problem that paraffin is prone to leakage after phase change is effectively solved, and the thermal stability is excellent. The foamy copper framework and the composite phase change material have a synergistic effect, heat transfer is accelerated through high thermal conductivity of foamy copper, a large amount of heat is absorbed by phase change latent heat of the composite phase change material, and a dynamic filling-static thermal conduction synergistic heat dissipation mechanism is achieved. By reasonably designing the proportion and the preparation process of the composite phase-change material and combining the structural optimization of the foamy copper framework, the thermal performance and the stability are synergistically improved, and the technical problem of an existing thermal interface material is solved.

The invention discloses a phase change material for a solar thermal collector and a phase change cavity applying the phase change material, and belongs to the heat storage technology of the solar thermal collector, the phase change material comprises the following components in parts by weight: 55-65 parts of capric acid, 25-35 parts of stearic acid, 7-13 parts of sodium chloride, and expanded graphite accounting for 3%-7% of the total weight of the capric acid, the stearic acid and the sodium chloride, and 0.2%-0.5% of a silane coupling agent. The phase change cavity is provided with a plurality of honeycomb-shaped through holes, space around the honeycomb-shaped through holes is filled with phase change materials, spiral fins are arranged in a part of the through holes, a heat collection panel is fixed at the bottom of the phase change cavity, and the heat collection panel is in contact with the phase change materials and the spiral fins respectively. The self-developed composite phase-change material is high in heat storage density, the heat storage capacity can be remarkably improved, the heat output time can be prolonged, and meanwhile the raw material cost is low; and meanwhile, the heat transfer area is increased through the honeycomb-shaped phase change cavities, the heat transfer rate can be increased through cooperation of the phase change cavities and the spiral fins, and then the overall heat collection and heat output efficiency of the solar heat collector is improved.

The invention provides a preparation method of a graphene carbonized sponge composite phase change material, which comprises the following steps: A) immersing melamine sponge in a graphene oxide solution, and drying to obtain a sponge structure coated with graphene oxide; b) heating and carbonizing the sponge structure coated with the graphene oxide, and then annealing to obtain reduced graphene oxide carbonized sponge; and C) immersing liquid paraffin into the reduced graphene oxide carbonized sponge, and drying to obtain the reduced graphene oxide carbonized sponge. The CF-rGO / PW composite phase change material disclosed by the invention has high thermal conductivity, electric heating property and good leakproof performance, and can be used for efficiently cooling and heating a battery in a wide temperature range, keeping the temperature of the battery in a safe working range, remarkably improving the thermal management performance of the battery, reducing temperature fluctuation, prolonging the service life of the battery and improving the safety of a system; the structure is light and convenient to integrate with a battery module.

The invention relates to a photo-thermal composite phase-change material with a built-in electric field for driving heterogeneous interface electron transfer and a preparation method of the photo-thermal composite phase-change material. The preparation method comprises the following steps: adsorbing multi-element metal through a metal organic framework precursor, and performing high-temperature carbonization to construct a graphitized carbon encapsulated metal nanoparticle coupled metal oxide ternary heterogeneous interface structure carrier; a built-in electric field is induced to be generated at a heterogeneous interface by utilizing Fermi energy level difference between the metal nanoparticles and the metal oxide, and electrons are driven to be transferred between the metal nanoparticles and the metal oxide; rich oxygen vacancies in the metal oxide effectively capture electrons, and efficient and controllable photon-generated carrier separation and utilization are achieved; and a pi-pi conjugate network of graphitized carbon forms a continuous electron transmission channel, so that rapid conduction of heat is further guaranteed. The problems that a traditional composite phase change material is high in carrier recombination rate, single in photothermal conversion mechanism and insufficient in thermal management controllability are solved, and the composite phase change material has application potential in the fields of solar heat storage, industrial waste heat recovery, intelligent temperature control systems and the like.

The application relates to the cable field and discloses a novel high-heat-dissipation energy storage device cable and a preparation method thereof. The novel high-heat-dissipation energy storage device cable comprises, from inside to outside, a core, a cross-linked polyethylene insulation layer, a shielding layer, a filling layer, an inner protective layer, an armored layer and an outer protective layer. The filling layer is filled with a composite phase change material. The composite phase change material comprises binary eutectic material, cross-linked polyurethane, graphene powder and modified spherical alumina. The cross-linked polyurethane is prepared by using PEG6000, diphenyl methane diisocyanate and boric acid as raw materials. The modified spherical alumina is prepared by grafting a modified silane coupling agent on the surface of spherical alumina through a thiol-alkene click reaction between triallyl isocyanurate and 3-mercapto propyl triethoxysilane. The filling layer filled with the composite phase change material has the characteristics of good heat conductivity, high phase change latent heat, wide phase change temperature range, good thermal cycle stability and good flame retardance.

The invention discloses a recyclable low-thermal-conductivity composite phase change material as well as a preparation method and application thereof, and relates to the technical field of building energy conservation. The composite material comprises polyethylene glycol (PEG) and a polymer matrix coating the polyethylene glycol, the polymer matrix is of a three-dimensional network structure formed by crosslinking polyvinyl alcohol (PVA) and sodium carboxymethyl cellulose (CMC-Na). According to the invention, PEG is loaded in situ in a PVA / CMC-Na skeleton through a freeze-drying method, the obtained composite phase change material (CPCMs) realizes excellent shape stability by virtue of hydrogen bond acting force and capillary acting force, and meanwhile, pores formed in the freeze-drying process enable the composite phase change material to have low thermal conductivity. The composite phase-change material is applied to building envelope structures and used for building temperature regulation. The composite phase change material is simple in preparation method, good in temperature adjusting performance and convenient to recycle.

The invention discloses a phase change material and an indoor refrigeration air conditioning system using the same, and belongs to an indoor air conditioning system, the phase change material comprises the following components by weight percentage: 78%-82% of modified sodium nitrate hydrate, 9%-11% of dodecanol derivative, 4%-6% of graphite powder, 0.8%-1.2% of borax, 2.5%-3.5% of trichloroethyl phosphate, and 0.8%-1.2% of 2, 6-di-tert-butyl-4-methylphenol. The phase change temperature of the composite-formula phase change material is controlled to be 10 + / -0.5 DEG C, the composite-formula phase change material is more suitable for the requirement of indoor refrigeration, the latent heat of the composite-formula phase change material reaches 200J / g, the absorption duration is remarkably prolonged, and the requirement of long-acting cooling can be met. And after the composite phase change material is applied to an air conditioning system, cold storage can be carried out through a refrigerating machine during off-peak electricity, cold energy is released by the phase change material in non-off-peak electricity time, the electric charge cost can be remarkably saved in long-term use, and the load pressure on a power grid is reduced in peak hours.

The invention relates to the technical field of secondary batteries, in particular to a temperature self-adjusting electrode and a secondary battery. The electrode comprises an active material and a composite phase change material, wherein the composite phase change material comprises a first phase change microcapsule and a second phase change microcapsule; wherein the phase change temperature t1 of the first phase change microcapsule is more than or equal to 5 DEG C and less than or equal to 45 DEG C, and the phase change enthalpy Q1 is 100-235J / g; the phase change temperature t2 of the second phase change microcapsule is 20 DEG C lt; t2-t1 < = 155 DEG C, and the phase change enthalpy Q2 meets the following condition: Q2-Q1 < = 200J / g is greater than or equal to 5J / g. According to the electrode provided by the invention, temperature self-adjustment under different working conditions is realized, temperature change is controlled, the service life of the battery under a wide temperature range working condition is prolonged, and meanwhile, thermal runaway of the battery is prevented.

The application relates to the technical field of composite phase change materials, and discloses a halloysite / carbon black aerogel encapsulated paraffin composite phase change material as well as a preparation method and application thereof. Sodium alginate is dissolved in deionized water, halloysite nanotubes and carbon black are added after stirring and dissolving, pyrrole is added after uniform mixing, and stirring is conducted; then, an initiator is added to initiate polymerization to form a hydrogel; the obtained hydrogel is directionally frozen by liquid nitrogen and then freeze-dried to obtain HCSA aerogel; the HCSA aerogel is immersed in molten paraffin to encapsulate paraffin, and the halloysite / carbon black aerogel encapsulated paraffin composite phase change material is obtained. The HCSA aerogel forms a stable three-dimensional porous structure by virtue of multi-component synergistic effect, the compressive strength is significantly improved, and the encapsulation rate of the PW is significantly improved; the PW@HCSA has excellent shape stability and thermal stability, and meets the long-term use requirement of thermal energy storage.

This invention discloses an encapsulation and molding technology for inorganic solid-liquid phase change materials. It enhances the photothermal conversion capability of inorganic hydrated salts through a two-stage encapsulation and molding process using a porous support material at the micro-pore stage, followed by shaping and a two-stage macro-encapsulation and molding process using commercial sealant and carbon materials. This two-stage encapsulation method plays a crucial role in maintaining the shape stability of the inorganic hydrated salt phase change material, resulting in a composite phase change material with a certain photothermal conversion capability. This multi-stage encapsulation and molding method is very simple, using low-cost porous matrix and commercial adhesives. It is highly effective in solving the problems of liquid leakage and thermal instability in inorganic hydrated salt phase change materials and can be extended to the multi-stage encapsulation and molding of other inorganic hydrated salt phase change materials. This simple, inexpensive, and efficient method will facilitate the application of inorganic hydrated salt phase change materials in practical applications.

The invention discloses an indoor and outdoor phase change heating device, and belongs to the technical field of heating equipment. The device aims to solve the problems that existing outdoor combustion heating equipment has carbon monoxide poisoning and fire hazards, and electric heating equipment depends on a continuous power supply. The device comprises a heat preservation box body, a heating system and a phase change heat storage device. The heating system is composed of a plurality of heating films with different power, a PID temperature controller and a plurality of independent mechanical temperature limiting switches, the phase change heat storage device arranged in the box is heated in a wrapping mode, and precise constant-temperature heating is achieved through double-threshold control logic. And a high-enthalpy-value composite phase change material is packaged in the phase change heat storage device. Heat energy is stored in the phase-change material through electric energy, long-time safe, silent and emission-free heating in the outdoor environment without a power source is achieved, and the phase-change heating device is particularly suitable for occasions such as camping in winter and outdoor operation and has the advantages of being safe, portable, environmentally friendly and capable of saving energy.

The invention provides a porous carbon-based multifunctional composite phase change material and a preparation method thereof, and belongs to the technical field of phase change materials. The porous carbon-based multifunctional composite phase change material provided by the invention comprises a porous carbon carrier, a phase change material loaded on the surface of the porous carbon carrier and in pores, and noble metal nanoparticles. The phase change material is loaded on the surface and in the pore channels of the porous carbon carrier, and active groups on the surface of the porous carbon carrier can adsorb the phase change material, so that liquid phase leakage of the phase change material in the phase change process is prevented; the porous carbon carrier, the noble metal nanoparticles and the phase-change material are synergistically matched, so that the heat conduction capability of the phase-change material is remarkably improved; meanwhile, the absorption of sunlight by the composite material is remarkably improved through the LSPR (Local Surface Plasmon Resonance) effect of the noble metal nanoparticles, and efficient conversion and storage from solar energy to heat energy are realized.

The invention relates to a phase change material and micro-channel liquid cooling composite lithium battery enhanced heat dissipation device, and belongs to the technical field of lithium battery thermal management. The device comprises a composite phase change material (CPCM) arranged between battery units and a tree-shaped micro-channel liquid cooling plate located on the outer side of the CPCM, and a metal packaging structure is arranged outside a battery pack. According to the method, heat generated by discharging of the battery is directly absorbed through the CPCM, the heat is conducted out in time through flowing of cooling liquid in the tree-shaped forked micro-channel liquid cooling plate, and the problem that the heat absorption performance of the CPCM is reduced due to temperature rise is effectively solved. The invention has the advantages of latent heat absorption and liquid cooling efficient heat conduction, can obviously improve the heat dissipation efficiency in high-rate discharge and high-temperature environments, ensures the temperature uniformity and working safety of the battery pack, and is suitable for the fields of power batteries, energy storage systems and the like.