556 results about "Composite phase change material" patented technology

The invention relates to the field of functional master batch materials, in particular to a phase-change energy temperature-adjusting fiber master batch and a fat-burning fabric thereof. The phase-change energy temperature-regulating fiber master batch is prepared from a composite phase-change material and polyethylene glycol terephthalate slices through melt extrusion and granulation, the fat-burning fabric is prepared from the phase-change energy temperature-adjusting fiber master batch and polyethylene glycol terephthalate slices through melt spinning, network compounding and weaving processing. By introducing the microencapsulated phase-change material and the high-thermal-conductivity filler, in the melt extrusion process, the microencapsulated phase-change material and the high-thermal-conductivity filler can be uniformly dispersed in the matrix material to form stable fiber master batches, form an efficient thermal-conductivity structure and provide excellent thermal regulation performance; meanwhile, microencapsulation can improve the stability and dispersity of the phase-change material, and the fat-burning fabric is prepared through melt spinning and weaving of fiber master batches, so that the heat-conducting property of the product is improved, and the continuous fat-burning effect is achieved.

The invention discloses a preparation method of a flexible material with double functions of radiation refrigeration and photothermal conversion storage, and relates to the field of composite phase change materials. The preparation method comprises the following steps: 1) preparing the flexible phase change material matrix by utilizing n-octadecane, SEBS and POE through hot pressing; 2) preparing a BaSO4 solution by using absolute ethyl alcohol, deionized water, a water-based defoaming agent, a water-based dispersing agent and an acrylic resin emulsion; (3) preparing an MXene solution; and 4) spraying the BaSO4 solution on the surface of one side of the flexible composite phase change material matrix by using a spray gun, and spraying the MXene solution on the surface of the other side of the flexible composite phase change material matrix to obtain the flexible composite phase change material. The radiation refrigeration layer can strongly reflect visible light and near-infrared light, has high emissivity in an infrared light area, especially in an atmospheric window wave band, reduces absorbed atmospheric heat radiation, reduces urban heat island effect caused by dense building groups in cities, and can effectively solve the problems of large day and night temperature difference and heat supply and demand in summer and winter.

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 thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The invention provides a composition, an adsorption and storage device containing the composition and an associated gas recovery system. The composition comprises a hierarchical porous MOFs-based composite phase change material and an adsorption material, and the adsorption storage device is an adsorption storage tank with the composition as bed filling. The associated gas recovery system mainly comprises a pressurizing unit, a cooling, condensing and dehumidifying unit and an adsorption and storage unit, wherein the adsorption and storage unit is the adsorption and storage device. The associated gas recovery system can realize a medium pressure-low temperature-phase change temperature control-adsorption storage single pull well associated gas recovery process, and realizes efficient recovery of single pull well associated gas with small gas volume, low casing pressure and far distance from a gathering and transportation station at low cost at low pressure (specifically 2-4MPa).

The invention discloses a biochar / carbon nanotube / myristic acid composite phase change material as well as a preparation method and application thereof, and belongs to the technical field of heat storage. The meat biochar / carbon nanotube / myristic acid composite phase change material is prepared by adopting a vacuum impregnation method. The original biochar is modified by KOH, so that the specific surface area and pore volume of a sample are increased, the specific surface area of the modified KBC3 reaches 813.56 m < 2 > / g, and the loading capacity of the KOH modified biochar on MA is increased to 63%. The result shows that the MA sample is successfully loaded into the porous material, and the structure is kept intact. In order to further improve the loading rate and the leakage resistance of the phase change material, carbon nanotubes are doped in the KBC / MA phase change material, and when the loading rate of MA is improved to 75%, KBC1.5 / MA severely leaks in a shape stability performance experiment, and the mass loss rate reaches 8.5%. And KBC1.5 / CNT1 / MA only has little leakage in the thermal stability test process, so that the leakage resistance of the composite phase change material is greatly enhanced. Through BC modification and CNTs introduction, the heat conduction capability and the photothermal conversion capability of the composite PCMs are greatly improved.

The invention discloses a UPS battery temperature control structure and a temperature control method thereof, and the structure comprises a battery module, a thermoelectric coupling layer, and a heat insulation housing. The battery module consists of a plurality of battery units, and unit gaps are filled with a composite phase change material; the thermoelectric coupling layer comprises a semiconductor thermoelectric module array and a heat conduction assembly, and precise heat conduction is achieved through bidirectional temperature control of semiconductor thermoelectric modules and directional heat conduction of heat pipes. The heat insulation shell comprises an inner aerogel heat insulation layer and a radiation coating and isolates external extreme temperature interference. The temperature control method comprises the steps of monitoring the battery temperature, the environment temperature and the phase change state of the composite phase change material in real time, dynamically selecting a pure composite phase change material buffer mode and a semiconductor thermoelectric module active or mixed mode, and generating power and recharging energy by using the temperature difference of the cold end and the hot end of the semiconductor thermoelectric module. Through the synergistic effect of the composite phase change material, the semiconductor thermoelectric module and the shell, the temperature of the battery can be stabilized without external constant temperature equipment, and the temperature control energy consumption is low.

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 high-thermal-conductivity polymer shaped composite phase change material and a preparation method thereof. The high-thermal-conductivity polymer shaped composite phase change material comprises macromolecular resin, a processing aid, a thermal conductive filler, an organic phase change material, a modifier, an initiator, an emulsifier, a dispersant and a catalyst. According to the invention, expanded graphite is used as a heat-conducting reinforcing agent, high-density polyethylene is used as a carrier, paraffin is used as a phase-change material, a melt blending method, an in-situ polymerization method and a hot press molding process are adopted to prepare a microencapsulated HDPE shaped paraffin composite material, the HDPE shaped paraffin composite material is completely encapsulated in a polymer film, so that the core material is completely coated, and the heat-conducting property of the core material is improved. According to the present invention, the microcapsule is prepared by using a chemical bond, and is tightly combined with the surface of the core material through the chemical bond so as to improve the stability and the durability of the microcapsule, such that the microcapsule can prevent leakage and improve the thermal conductivity, such that the microcapsule can maintain the stable performance in the multiple phase change cycles, and the microcapsule has good fluidity and good dispersion so as to be conveniently processed and applied in various base materials.

The present invention belongs to the technical field of material dehydration, and particularly relates to a dehydration device for an urban waste biomass-based composite phase change material, which comprises a bracket. A roll press filter is installed on the bracket. The roll press filter includes two side plates, two pairs of driving rollers, two guide rollers, two filter belts with mesh holes, and a connecting frame. Two hollow brush barrels driven by a gear set are rotatably connected between the two side plates. The hollow brush barrels have bristles that contact the filter belts. A drying box is installed on the bracket, and a rotating spiral frame is arranged in the drying box. The material after being filter-pressed by the roll press filter enters the drying box for drying. The rotating spiral frame and the stirring rods make the material turn over. Under the action of the gear set, the rotating hollow brush barrels brush off the material on the filter belts through the bristles, reducing the adhesion of the material and ensuring the effect of subsequent filter-pressing of the filter belts on the material. The moving inclined plate reciprocates through a moving mechanism to break the material, reducing the stacking of the material and improving the drying effect.

The utility model discloses a light-weight temperature-controllable battery thermal management system, which comprises batteries, a composite phase-change material, a micro-channel, an interface phase-change material and a heating film, wherein the batteries are connected in series and in parallel to form a battery module; the battery modules are arranged in a staggered manner and are honeycomb-shaped; the composite phase change material wraps the peripheral surface of the battery and is in direct contact with the battery; the micro-channels are longitudinally arranged on the peripheral surface of the composite phase-change material in a layered manner, each micro-channel is in a honeycomb grid shape and surrounds each battery, a water inlet is formed in the edge of one end of each micro-channel, a water outlet is formed in the edge of the other end of each micro-channel, and the vertically adjacent micro-channels are connected through a supporting frame body; the interface phase-change material covers the battery tab, and a heating film is fixed on the other surface of the interface phase-change material; the power battery is simple in structure, meets high safety and convenience of power battery design, highlights lightweight design in the power battery design, reduces system construction cost, has double functions of high-temperature heat dissipation and low-temperature heating, and has wide application space.

The invention discloses a low-temperature early-strength cement slurry system based on a cellulose-based composite phase change material, and belongs to the field of oil and gas field well cementation. The preparation method of the composite phase change material comprises the following steps: adding pretreated waste paper fibers, a cross-linking agent and a heat conduction material into an alkali / urea solution, and putting the mixture into an ultrasonic cleaning instrument to obtain a mixture A; transferring to a dialysis bag, and soaking in deionized water to obtain a mixture B; and performing in-situ mixing on the mixture C and organic phase change material molecules to obtain a mixture C, and performing vacuum freeze drying. The low-temperature early-strength cement slurry system is prepared from the following components in parts by weight: 100 parts of cement, 0.3-1 part of a composite phase change material, 5-25 parts of a density reducing material, 0.1-0.8 part of an early strength agent, 0.2-1 part of a dispersing agent, 0.2-2 parts of a fluid loss agent, 0.01-0.5 part of a defoaming agent and 44-58 parts of water. While cement hydration heat release is regulated and controlled, the early compressive strength of the cement can be improved, and the operation time efficiency and the construction safety are improved.

The invention relates to the technical field of phase change materials, and discloses a multifunctional composite phase change material and a preparation method and application thereof. The phase change energy storage microcapsule is prepared from the following raw materials: a core material, a Pickering emulsion template and a wall material, the wall material comprises resin and polypyrrole. The multifunctional composite phase change material is prepared from the phase change energy storage microcapsule, a reinforcing material and a polymer elastomer. The phase change energy storage microcapsule provided by the invention is uniform in size, regular in shape, good in stability and good in coating effect, the surface is doubly coated with the resin and the polypyrrole nanoparticles, the phase change material leakage condition is avoided, and the thermal cycling stability is good; the multifunctional composite phase change material has good photo-thermal conversion capability and conductivity and good thermal cycling stability, can meet the multi-scene application requirements in the fields of intelligent wearing, solar energy conversion and human body near-infrared photo-thermal treatment, and is non-powdery and can be directly used.

The invention provides a phase-change composite aerogel material for photothermal conversion and high-density heat storage. The phase-change composite aerogel material takes MXene / CNTs modified aerogel as a three-dimensional porous continuous supporting framework and takes a phase-change material as a filling material; wherein the phase change composite aerogel material is prepared from the following components in percentage by mass: 3.0 to 4.4 percent of MXene / CNTs modified aerogel and 95.6 to 97.0 percent of a phase change material according to 100 percent of mass percent. The invention also provides a preparation method of the phase change composite aerogel material. The MXenes / CNTs modified aerogel composite phase change material prepared by the preparation method disclosed by the invention is in a micron level, MXenes and CNTs are attached to the surface and the interior of the MXenes / CNTs modified aerogel composite phase change material, and the MXenes / CNTs modified aerogel composite phase change material is large in heat transfer area, good in heat transfer performance and mechanical performance and wide in application range; the preparation method is simple, and the reaction time and reaction conditions are easy to control. The invention also provides application of the phase-change composite aerogel material in solar photothermal conversion and heat storage materials.

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 carbon aerogel / reduced graphene oxide double-framework composite phase change material based on shaddock peel as well as a preparation method and application of the carbon aerogel / reduced graphene oxide double-framework composite phase change material. According to the method, the carbon aerogel / reduced graphene oxide double-framework material (CPA-rGO) with a hierarchical pore structure is constructed by taking waste shaddock peel as a raw material through freeze drying, a layer-by-layer self-assembly (LbL) technology and a gas-phase reduction and high-temperature carbonization process. And then, loading n-octacosane in the porous skeleton by a vacuum-assisted impregnation method to form the composite phase change material (OCPA-rGO) with a stable shape. The material has excellent leakproof performance (the leakage rate at 70 DEG C is only 4%), high thermal conductivity (0.366 W / (m.K)), remarkable photothermal conversion efficiency (91.6%) and electrothermal response characteristic, has a temperature sensitive resistance function, and can be applied to building energy-saving temperature control and intelligent household high-temperature early warning systems. According to the invention, high-value utilization of agricultural wastes is realized, and a new thought is provided for design of efficient and multifunctional phase change energy storage materials.

The invention discloses an energy-saving driving device based on automatic control, which comprises a support frame, a conveying mechanism is mounted at the upper end of the support frame, a transmission belt is mounted on the conveying mechanism, a plurality of photonic crystal pressure sensors are arranged on the transmission belt at equal intervals, and a driving motor body is mounted at one end of the conveying mechanism. A protective shell is installed on the outer side of the driving motor body, a stator shell is installed in the protective shell, a plurality of stator grooves are formed in the circumferential side wall in the stator shell at equal intervals, and heat storage layers are installed in the stator grooves. The static heat insulation limitation of a traditional vacuum heat insulation plate is broken through, the shell of the driving device has the efficient heat insulation and active heat dissipation capacity, in addition, the maintainability is greatly reduced through the self-repairing design, the use convenience is improved, light intensity change is used for detecting goods distribution, linkage adjustment of the rotating speed of the transmission roller is achieved, and idling energy consumption is reduced; the paraffin and graphene composite phase change material can fully meet the low-temperature conveying requirement, and the service life is prolonged.

The invention belongs to the technical field of batteries, and particularly relates to a microcapsule type flame retardant and a preparation method thereof, a composite phase change material and a preparation method and application thereof. According to the microcapsule type flame retardant provided by the invention, the melamine cyanurate is used for wrapping, aluminum hypophosphite can be isolated from a heat source, and decomposition of the aluminum hypophosphite is delayed, so that the problem of poor stability of the aluminum hypophosphite is effectively solved; the melamine cyanurate and the phosphorus-based flame retardant can also achieve a phosphorus-nitrogen synergistic flame retardant effect, so that the flame retardance of the flame retardant is improved. Furthermore, the invention also provides the composite phase change material, and the preparation raw materials comprise a phase change matrix, a supporting framework, a heat conduction reinforcing agent and a flame retardant, the flame retardant is ammonium polyphosphate and a microcapsule type flame retardant; when the composite phase change material is applied to a battery thermal management system, heat generated by a battery can be absorbed in time, the temperature of the battery is kept within a reasonable range, and when the battery is on fire abnormally, the composite phase change material can play a role in flame retardance and reduce the risk of thermal runaway.

The invention provides a battery thermal management method and device combining a composite phase change material and an adsorption heat pump, and relates to the technical field of battery thermal management, the method is applied to the battery thermal management device, and the battery thermal management device absorbs heat generated by a battery pack of an energy storage battery through the composite phase change material, and stores the heat generated by the battery pack through the adsorption heat pump. The battery heat management device is used for cooling and heating the battery pack through an adsorption type heat pump; the method comprises the following steps: acquiring the temperature of the battery pack; controlling the composite phase change material to absorb heat generated by the battery pack based on the temperature of the battery pack; obtaining the temperature of the composite phase change material; and controlling the adsorption heat pump to cool the battery pack based on the temperature of the composite phase change material. According to the invention, a composite phase change material and an adsorption type heat pump adsorption and desorption technology can be combined, so that the control on the temperature of the energy storage battery cell and the efficient energy-saving operation of the energy storage battery cell are realized.

The invention discloses a eutectic composite phase change material and a preparation method thereof, the composite phase change material takes long-chain fatty acid, long-chain alcohol and saturated fatty acid as raw materials, and the obtained composite phase change material shows excellent heat storage and release capability and temperature regulation capability.

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 material dehydration, and particularly relates to urban garbage biomass-based composite phase change material dehydration equipment which comprises a support, a double-roller filter press is mounted on the support and comprises two side plates, two pairs of transmission rollers, two guide rollers, two filter pressing belts with meshes and a connecting frame, and the connecting frame is mounted on the support. Two hollow brush cylinders driven by a gear set are rotationally connected between the two side plates, the hollow brush cylinders are provided with bristles in contact with the filter pressing belt, a drying box is installed on the support, and a rotating spiral frame is arranged in the drying box. Materials subjected to filter pressing of the roller filter press enter the drying box to be dried, the materials are turned over through the rotating spiral frame and the stirring rod, and under the action of the gear set, the materials on the filter pressing belt are brushed off through the bristles of the rotating hollow brush cylinder, so that material adhesion is reduced, and the subsequent material filter pressing effect of the filter pressing belt is guaranteed; and the moving inclined plate reciprocates through the moving mechanism to break the materials, so that material stacking is reduced, and the drying effect is improved.

The invention provides an MXene-derived skeleton composite phase-change material with strong electromagnetic shielding performance, which is a composite phase-change material with a stable shape, which is obtained by taking MXene-derived aerogel as a skeleton material and carrying out vacuum impregnation and adsorption on a molten phase-change material. Wherein the MXene-derived aerogel is an aerogel-based framework material obtained by adding chitosan quaternary ammonium salt, polyethyleneimine and carbon nanotubes into an MXene aqueous dispersion, uniformly dispersing to obtain a mixed solution, directionally and rapidly freezing in liquid nitrogen, carrying out vacuum freeze drying and carrying out high-temperature carbonization. The composite phase change material not only has high thermal conductivity and high latent heat, but also has an EMI (Electro-Magnetic Interference) shielding function and electric heating, photo-thermal and magnetic-thermal conversion capabilities, the highest thermal conductivity is 0.64 W / m.K, the EMI shielding effectiveness is up to 38.28 dB, and the composite phase change material has wide application prospects in electric heating, photo-thermal, magnetic heating, energy storage and electronic equipment thermal management.

The invention discloses a photovoltaic energy storage and cooling coupled system and method based on a copper-based composite phase change material. A power generation module, a cooling energy storage module, an energy conversion module and the like are included. In the daytime, the solar photovoltaic panel emits heat, and the copper-based composite phase change material absorbs heat, stores energy and cools the photovoltaic panel; at night, the phase change material releases heat, and the thermoelectric material converts heat energy into electric energy. The system uses a DDPG algorithm of deep reinforcement learning to optimize operation. The state space comprises parameters such as the temperature of the solar photovoltaic panel and the temperature of the phase-change material, and the action space relates to operations such as control of cooling energy storage and energy conversion. The reward function is designed in multiple aspects of comprehensive efficiency, energy storage, electric energy output and stability. By constructing a strategy network and a value network, the system can make decisions according to environmental changes. And extracting data from the experience playback buffer area to update network parameters so as to enable the system to perform self-adaptive adjustment. The system not only solves the problems of high temperature of the photovoltaic panel and power generation at night, but also improves the energy utilization efficiency by using an algorithm, and the performance is far better than that of a traditional photovoltaic system.

The present disclosure provides a phase change energy storage concrete aggregate, a preparation method thereof and an application thereof, belonging to the technical field of building materials. The phase change energy storage concrete aggregate includes: a first inner core, the first inner core including composite phase change material particles and a porous cement-based material; and a first shell layer formed on the outer surface of the first inner core, the first shell layer including a cement-based encapsulating material; wherein, the composite phase change material particles include: a second inner core, the second inner core including an inorganic hydrated salt phase change material and a porous medium material, the inorganic hydrated salt phase change material being loaded in the pores of the porous medium material; and a second shell layer formed on the outer surface of the second inner core, the second shell layer sequentially including a hydrophobic layer, a polymer layer and a hydrophilic layer from inside to outside. The present disclosure effectively blocks the dehydration channels of the inorganic hydrated salt phase change material by using a double-shell layer structure, and improves the thermal performance of the phase change energy storage concrete aggregate.

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 discloses a self-repairing type phase change microcapsule and application thereof in a wood-based energy storage wall, the self-repairing type phase change microcapsule is characterized in that an inner core layer is composed of composite paraffin and butyl stearate composite phase change materials, gradient refractive index silicon dioxide microspheres are arranged on the surface of the inner core layer, and a middle shell layer is a composite film formed by polyurea and furan-epoxy monomer copolymer; the reinforced shell layer is of a three-dimensional network structure which is formed by nano SiO2 through a sol-gel method, has the porosity of 20-25% and is in gradient distribution; according to the invention, a three-dimensional network structure formed by a Diels-Alder dynamic bonding network of a middle shell layer and nano SiO2 of an enhanced shell layer is used for synergistically constructing a self-repairing system of the microcapsule, so that the self-repairing function of the phase change microcapsule material is realized, the defect of failure caused by physical damage of the microcapsule is avoided, and the service life of the phase change microcapsule material is prolonged. And meanwhile, through gradient packaging preparation of the inner core layer and the enhanced shell layer, the problem of thermal stress concentration is effectively solved.

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.