429 results about "Thermal safety" patented technology

The invention provides a pole charging variable flow thermal safety control method and system based on AI multi-objective optimization, and relates to the technical field of pole charging variable flow thermal safety control, and the method comprises the steps: collecting the electrical state quantity and thermodynamic state quantity of a pole charging converter in real time; constructing a digital twinborn model of the polar charging converter; constructing a DRL training environment, and training a DRL intelligent agent; setting a security guard strategy independent of the DRL intelligent agent; the optimal optimization strategy is deployed to a converter control system, and the converter and a cooling system are controlled in real time; and carrying out on-line calibration on key parameters of the digital twin model. According to the method, the digital twinborn model is constructed and the DRL is combined to carry out multi-objective optimization decision making, so that intelligent, accurate and adaptive control on the thermal safety of the electrode charging converter is realized; the digital twin is self-calibrated, so that the thermal management level, the operation efficiency, the reliability and the long-term adaptability to equipment aging and environment change of a converter system are effectively improved.

The invention relates to the technical field of energy storage battery performance detection, and discloses a performance detection device and method for an energy storage battery, and the method comprises the steps: calculating a thermal safety coefficient based on the internal temperature of the battery, the temperature gradient, the Joule heat generation rate and the environment temperature; calculating a voltage safety coefficient based on the battery end voltage, the voltage change rate and the voltage range; according to the thermal safety coefficient, the voltage safety coefficient, the battery expansion strain and the internal pressure, calculating the collaboration reflecting the multi-physical field state coordination; calculating an aging coefficient based on the accumulated current stress, the accumulated cycle index and the high stress duration of the battery; and finally, based on the collaboration, the aging coefficient and the rated current, calculating the target charging and discharging current and performing real-time adjustment. The device comprises a memory and a processor and is used for executing the method. According to the invention, multi-dimensional fusion evaluation and self-adaptive management of thermal, electrical and mechanical states and aging processes of the energy storage battery are realized, and the operation safety and service life of the battery are remarkably 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 embodiment of the invention provides a method and a device for determining thermal safety margin of a reactor core, and belongs to the technical field of nuclear power. The method comprises the steps that initial information of various fuel assemblies in a reactor core is obtained, and the initial information comprises stirring and mixing grillwork geometric characteristics of the fuel assemblies and test results obtained by conducting a critical heat flux density test on the fuel assemblies; determining a target critical heat flux density relational expression corresponding to the reactor core according to the initial information of the multiple fuel assemblies; and performing thermal safety margin calculation on the reactor core according to the target critical heat flux relational expression to obtain a target thermal safety margin. According to the embodiment of the invention, the problem of low accuracy of thermal safety margin calculation of the reactor core in the prior art can be solved, the characteristic difference of different types of fuel assemblies is fully considered, and the accuracy of a thermal safety margin analysis result is improved.

The invention discloses a wall breaking machine overload dynamic control method based on multi-source signal fusion, and particularly relates to the field of control and regulation, and the method comprises the steps: firstly executing multi-source signal collection and feature enhancement processing, synchronously collecting electrical, motion, mechanical and thermal signals, and extracting a related feature set after preprocessing; secondly, carrying out multi-dimensional complex coupling analysis, constructing functions of load intensity, mechanical state and thermal safety to quantify single-field risks, and designing three coupling terms of load and machinery, machinery and heat and load and heat to represent a multi-field synergistic effect; generating a comprehensive risk value and a dynamic threshold value, solving the risk value and speed increase, setting the threshold value in a grading manner by combining mode characteristics, and identifying a dominant coupling item; and finally, executing four-stage progressive regulation and control, and starting early warning preparation, card breaking intervention, emergency dredging and final recovery or shutdown actions according to a risk state. According to the invention, physical driving is taken as a core, accurate quantification of risks and coupling-oriented regulation are realized, and equipment safety and effect are both considered.

The invention belongs to the technical field of thermal management of immersed liquid-cooled batteries, and particularly relates to a battery module temperature equalization and flow resistance self-adaptive liquid cooling system based on temperature and flow velocity monitoring. Multi-point temperature information of a battery module is obtained through a temperature monitoring unit, and a temperature equalization index is calculated; the flow resistance change of the liquid cooling loop is judged by combining the flow speed monitoring unit with the running state of the circulating cooling pump, and the central control unit dynamically adjusts the rotating speed of the circulating cooling pump and / or controls the flow channel adjusting assembly to switch the cooling liquid flow channel based on the combination result of the temperature uniformity state and the flow resistance state. Therefore, the temperature consistency of the battery module and the self-adaptive control of the flow resistance of the liquid cooling system are realized under different operation conditions, the cooling of a key area can be enhanced when local hot spots exist, the flow path is optimized and the energy consumption is reduced when the flow resistance is increased or the load is relatively low, the thermal safety, the operation stability and the energy efficiency level of the battery system are improved, and the service life of the battery system is prolonged. The method is suitable for liquid cooling heat management scenes of high-energy-density batteries.

The invention discloses a socket with safety protection. The socket comprises a multi-mode thermal sensing array, and a fusion array of a miniature infrared thermal imaging sensor array and a distributed fiber grating temperature sensor which are integrated at key points in the socket; according to the active locking mechanism based on the thermal deformation prediction model, a micro servo motor, a ball screw, a pre-tightening spring and a spring bolt form an electronic lock, a shape memory alloy wire is used for rapid and silent emergency unlocking, and the micro servo motor is used for high-precision conventional locking; the dynamic thermal safety boundary algorithm module is used for dynamically calculating the optimal temperature upper limit and the optimal power upper limit of each component in the current state according to factors such as a real-time temperature field, predicted thermal deformation, current charging power and historical charging data; the main controller is used for transmitting a large amount of real-time temperature field data. Through multi-mode sensing, predictive modeling and master-redundancy cooperative execution, thermal safety and mechanical reliability of the charging interface under extreme working conditions are guaranteed.

The invention relates to the technical field of battery thermal safety management, and discloses an energy storage battery thermal runaway intelligent early warning method and system based on machine learning, and the method comprises the steps: obtaining an energy storage system cooling layout parameter and a sensor data flow, generating a data missing mode recognition result containing a missing time period, a missing position and a missing type; probability distribution of temperature and flow physical quantity of the missing sensor is inferred through a message passing mechanism, and a numerical value distribution inference result of the missing sensor is output; posterior state distribution is calculated through Bayesian reasoning, and a virtual-real mixed thermal state estimation result is generated; and analyzing a thermal state estimation result based on a confidence coefficient weighted multi-objective optimization algorithm, constructing a multi-objective function including weighted risk minimization and cooling energy consumption cost minimization, and outputting a cooling control instruction. The technical problem that a traditional digital twinning system is highly dependent on data integrity is solved.

The invention relates to the technical field of machine room environment regulation and control, in particular to a communication base station intelligent energy-saving window control design method and system, and the method comprises the steps: obtaining and classifying base station source load data, setting energy-saving window parameters and an off-network strategy, monitoring a power supply state, and cooperatively controlling temperature control equipment in combination with electric quantity temperature difference. According to the method, the thermodynamic state is digitalized by calculating the outdoor cold source potential energy gradient and the indoor thermal load cumulative acceleration and combining the enthalpy difference allowance so as to accurately evaluate the natural cold source potential; the optimal ventilation opening degree and the fan rotating speed are matched through multi-dimensional feature clustering, so that the condensation risk is strictly restrained according to dew point approximation deviation while the heat dissipation efficiency is guaranteed, and in addition, a dual-target evaluation function in an off-grid scene is constructed to solve a non-dominated solution set of endurance time and thermal safety. A dynamic protection threshold value is generated; and when the commercial power is interrupted, a control strategy is adaptively adjusted according to the real-time load and the environment temperature, so that the off-network life cycle of the base station is maximized, and core equipment is ensured to always run within a safe temperature boundary.

The invention is suitable for the technical field of electrochemical energy storage, and provides an integrated structure solid-state battery module constructed based on SiO2 aerogel powder and a preparation method of the integrated structure solid-state battery module. And a stress buffering-ion conduction-thermal triggering self-repairing collaborative interface system is constructed. According to the Janus powder, a ZrO2 nanocluster and a SiO2 network form a rigid core, a dynamic shell containing a Diels-Alder dynamic covalent bond is grafted on the outer surface and the inner wall of a pore channel, and a lithium salt-ionic liquid compound is loaded in pores; a vertical columnar stress supporting framework is formed through a transient liquid phase auxiliary cold sintering process, and two-step thermal triggering self-repairing treatment is combined, so that stress buffering of electrode volume change in the charging and discharging process and interface self-repairing in the early stage of thermal abuse are achieved. The interface stability, the cycle life and the thermal safety of the solid-state battery are remarkably improved, and the solid-state battery is suitable for power batteries, high-capacity energy storage batteries and other scenes.

The invention discloses a positive electrode interface layer material for an all-solid-state battery and a preparation method of the positive electrode interface layer material, and relates to the technical field of solid-state batteries. According to the interface layer material provided by the invention, an ion-electron co-conduction network is formed through in-situ polymerization, a cured interface layer with flame-retardant and interface wetting functions is constructed between positive electrode particles and a solid electrolyte, and the cured interface layer comprises the following components: a polymerizable monomer, a flame retardant, an interface wetting agent, a lithium salt, a conductive agent, an initiator and a solvent. According to the material, the polymerizable monomer, the flame retardant and the interface wetting agent are synergistically introduced in a specific manner, so that the thermal safety of the battery is remarkably improved, and meanwhile, the interface contact and lithium ion transmission kinetics between a positive electrode and a solid electrolyte are effectively improved, so that the comprehensive optimization of the safety and the electrochemical performance is realized.

The invention relates to the technical field of new energy, in particular to a multi-stage compound positive electrode material as well as a preparation method and application thereof, and the compound positive electrode material comprises a phosphate spherical material, phosphate single particles and a ternary material which are compounded in a three-stage mixing manner; the phosphate spherical material is formed by aggregating primary particles, the particle size distribution consistency ((D90-D10) / D50) is 1.2-2.0, the closed pore porosity in the spherical material is less than or equal to 5vol.%, and the phosphate single particles are obtained by crushing and dissociating the phosphate spherical material. Phosphate spherical materials and single particles are prepared through hydro-thermal synthesis, the phosphate spherical materials are formed by agglomeration of nano-particles and have good rate capability and nitrogen-containing pores (with excellent thermal resistance), and the single particles are ternary materials for gap filling and thermal resistance. The advantages of a ternary material and a phosphate material are coordinated, and the energy density, the thermal safety and the service life of the battery are optimized.

The invention provides a diaphragm and a secondary battery, and belongs to the technical field of secondary batteries, and the diaphragm comprises a base membrane and a coating. Wherein the coating is arranged on one surface, facing the positive pole piece, of the base film, and the coating comprises an electroactive material and a binder; the electroactive material comprises at least one of a quinone derivative, a phenazine derivative, an imide derivative and a phenothiazine derivative. The electroactive material in the diaphragm coating can be dissolved in the electrolyte after the environment temperature reaches the thermal safety critical temperature, and reacts with the positive and negative active materials, so that the charge state of the battery is quickly reduced, and the thermal runaway of the battery is inhibited or even avoided.

The invention provides a thermal runaway sensing and inhibiting method and system for an energy storage system and a medium, and the method comprises the steps: carrying out the real-time data collection of the interior of the energy storage system based on a multi-type sensor, obtaining multi-source collection data, carrying out the fusion processing of the multi-source collection data, and obtaining fusion data; constructing a real-time state vector of the energy storage system based on the fused data, and performing feature extraction and trend analysis on the state vector based on a multivariable discrimination algorithm to obtain state information of the energy storage system; judging whether to enter a thermal runaway evolution channel or not based on the function state information of the energy storage system, outputting a risk level, dynamically matching an intervention measure, and transmitting the risk level and the matched intervention measure to a terminal in real time for monitoring; according to the invention, accurate identification is carried out through multi-dimensional parameters at the initial stage of thermal runaway, a sensing-discrimination-suppression closed-loop safety control mechanism is realized, the control response is rapid, intervention measures can be rapidly started, the overall thermal safety level of the system is improved, and the accident rate is reduced.

The invention belongs to the technical field of transmission cooling and lubricating, and relates to a transmission rear end forced lubricating and cooling system of a parallel hydrodynamic retarder and a transmission. Comprising a retarder support, a rear cover, an oil pump, a power takeoff side cover, a rear bearing cover, an oil pump diverter valve, a cooling lubricating oil way, an oil filtering plug screw and a net type oil filter. The oil pump diverter valve is used for being connected with an external heat exchanger, oil in an oil way is cooled, the temperature of lubricating oil is effectively reduced, and thermal safety of parts in the box body is guaranteed. Under the condition that other structures of the gearbox are not added, all-directional lubrication inside a rear-end transmission system is achieved, and the structural compactness and the space utilization rate are improved. Lubricating points of the lubricating system are comprehensively covered, oil duct connection of different shells is achieved through butt joint of the cross-joint-surface oil ducts, the lubricating system is compact in design, and the comprehensive performance, safety and reliability of a transmission system are improved in the aspects of heat dissipation, cooling, fatigue and efficiency of the system.

The invention, which relates to the technical field of thermal safety monitoring and control of the battery replacement cabinet, discloses a safety control method for a battery replacement cabinet based on an intelligent Internet of Things. According to the invention, a multivariable time sequence anomaly detection model is combined with a long and short term memory auto-encoder and an attention mechanism, deep features can be extracted from voltage, current and environment temperature data, and the thermal safety of the battery replacement cabinet is monitored and controlled. Internal heat accumulation initial signals which are difficult to capture by an external sensor are effectively identified; according to the data driving method, the limitation of traditional fixed threshold monitoring is overcome, and sensitive capture of subtle abnormal changes is realized by dynamically learning a normal charging and discharging mode, so that the early warning opportunity is advanced, and the risk of missing report caused by surface temperature lag is reduced; the dynamic threshold mechanism is adaptively adjusted based on the quantile of the target false alarm rate and the working condition parameters, so that the system can flexibly cope with complex factors such as different environment temperatures and battery aging degrees, the false alarm problem caused by a unified threshold is avoided, and the early warning accuracy is improved.

The invention relates to the technical field of power battery thermal engineering and thermal safety, and discloses a liquid cooling-phase change coupling battery thermal management system based on a liquid phase rate weighting method, and the system comprises a battery module which is formed by stacking and arranging a plurality of single batteries along a first direction; the liquid cooling plate is arranged on the side surface of the battery module and is used for carrying out active heat dissipation on the battery module; the plurality of phase change material units are respectively filled between the adjacent single batteries; wherein the thicknesses of the plurality of phase change material units are non-uniformly distributed, the thickness of each phase change material unit is positively correlated with the corresponding average liquid phase rate reference value, and the average liquid phase rate reference value is the average liquid phase rate reference value of the corresponding phase change material unit under the same thickness setting condition. And the average liquid phase rate of the phase change material unit under the preset discharge working condition is obtained through thermal simulation calculation. According to the invention, the maximum temperature difference in the battery module is obviously reduced, the phase change process synchronization of each region is realized, the material utilization rate is improved, and the thermal stability of the system in the high-rate dynamic discharge process is enhanced.

The invention relates to the technical field of heating, in particular to a heating system based on waste heat recovery of a generator set, which comprises a waste heat collection unit comprising a plate heat exchanger and a cooling tower which are connected in parallel on a condenser circulating pipeline of the generator set, and a switching valve group is arranged between the plate heat exchanger and the cooling tower; the underground energy storage unit comprises a first mining and recharging well and a second mining and recharging well which are connected with the plate heat exchanger through a heat exchange pipeline, and the bottoms of the first mining and recharging well and the second mining and recharging well are thermally coupled through a high-heat-conduction filling layer; the heat pump unit comprises a lithium bromide absorption heat pump, and a low-temperature heat source inlet of the lithium bromide absorption heat pump is connected with an outlet of the plate heat exchanger and a water pumping pipeline of the first mining and recharging well in parallel. Compared with the prior art, the system has the advantages that the underground energy storage unit and the switching valve group are arranged to operate cooperatively and work cooperatively, heat supply safety is guaranteed, meanwhile, overground and underground integrated waste heat regulation, storage, release and control are achieved, and the stability, the regulation capacity and the energy comprehensive utilization efficiency of the system are improved.

The invention relates to a method of operating and / or fueling a compressed gas supply system (34) having at least two compressed gas tanks (15, 16, 17, 18, 19) connected to an anode path (2) of a fuel cell system (1).To increase thermal safety during operation and / or fueling of the compressed gas supply system (34), the valve devices (21, 22, 23, 24, 25) assigned to the pressure tanks (15, 16, 17, 18, 19), which comprise a filling path with an actively switchable filling valve and a discharge path with an actively switchable discharge valve for each of the compressed gas tanks (15, 16, 17, 18, 19) are individually actuated via an electronic control unit, which is connected to a sensor device having at least one sensor, which senses a current temperature in the respective valve installation (21, 22, 23, 24, 25).

The invention relates to the technical field of steam heat supply pipe network state detection and optimization, and discloses an automatic calculation method for the working condition of a low-pressure steam heat supply pipe network. According to the automatic calculation method for the working condition of the low-pressure steam heat supply pipe network, the theoretical steam pressure, the theoretical temperature parameter and the theoretical enthalpy value of the user side can be obtained through calculation without additionally installing a sensor, and then the theoretical total amount of condensate water of the whole steam heat supply pipe network is obtained; finally, the theoretical pipe loss rate of the whole pipe network can be obtained, if the theoretical pipe loss rate is lt; if the actual pipe loss rate is the actual pipe loss rate, the pipe network has gas leakage, and if the theoretical pipe loss rate is gt; according to the method, the current pipe network operation problem can be detected, and heat supply safety and economical efficiency are improved. And the safest and economical heat supply network pipe diameter can be matched for a to-be-newly-built steam heat supply pipe network through theoretical calculation, the aim of minimizing heat supply pipe loss is achieved on the premise that the requirement of a user for steam parameters is met, and the construction cost and the operation cost are reduced.

The invention discloses a lithium ion battery thermal runaway propagation modeling method coupled with a semi-empirical flame radiation model, and belongs to the technical field of battery thermal safety. According to the method, thermal runaway jet parameters of the battery are obtained, a single-point source method is adopted to calibrate flame radiation fractions, a solid flame radiation model with a cylinder and a cuboid combined is established, and a radiation heat source is coupled to a three-dimensional thermal runaway propagation model to solve temperature distribution. According to the method, the technical problem that a traditional method cannot give consideration to calculation efficiency and precision is solved, through innovative combination of special geometric simplification and a semi-empirical radiation model, the calculation efficiency is remarkably improved while the model precision is guaranteed, and an efficient and reliable simulation tool is provided for thermal safety design of the lithium ion battery module.

The invention belongs to the technical field of ceramic fiber composite material preparation, and provides a ceramic fiber aerogel felt and a preparation method thereof. A ceramic fiber felt is used as a framework, basic sol is prepared through a sol-gel method, and three additives are introduced: the first additive is a borosilicate oligomer solution used for forming a high-temperature-resistant borosilicate network in a final material; the second one is a Ti-POSS solution which is used as an in-situ precursor of a high-temperature infrared opacifying agent and is used for inhibiting radiation heat transfer of the material at high temperature; the third solution is a phosphazene siloxane solution, so that the material is endowed with intrinsic flame retardance and flexibility; then, functional conversion and ceramization processes are completed through solvent replacement, surface hydrophobic modification, normal-pressure drying and heat treatment, and the obtained ceramic fiber aerogel felt has excellent heat insulation performance and high-temperature structural stability and has important application value in the field of thermal safety protection of high-end power batteries.

The invention provides an electrolyte, a secondary battery and an electrolyte preparation method, and belongs to the technical field of secondary batteries, and the electrolyte comprises a lithium salt, a solvent and a thermal runaway blocking agent. Wherein the thermal runaway blocking agent comprises an inner core and a shell located on the outer side of the inner core, the inner core comprises a polymer formed by polymerizing a melamine compound, an amino-containing nitrogen-containing compound and an aldehyde compound, and the shell comprises a fluorine-containing flame retardant. According to the electrolyte disclosed by the invention, in the thermal runaway process of the battery, the thermal runaway blocking agent is used for carrying out physical blocking, chemical capture and atmosphere dilution on a chain reactant on the surface of a negative electrode to block a chain exothermic reaction generated by oxygen released by decomposition of the negative electrode and a positive electrode, so that the thermal runaway initial temperature of the battery is effectively increased; the maximum thermal runaway temperature of the battery is reduced, and the thermal safety performance of the battery is remarkably improved.

Provided in the present application are a battery assembly and an electrical device. The battery assembly comprises at least two groups of cell battery packs, and a separator located between two adjacent groups of cell battery packs. The separator comprises a hard calcium silicate board, and the hard calcium silicate board comprises a hard calcium silicate material, the density of the hard calcium silicate plate being greater than 170 kg / m3 and less than 600 kg / m3. The present application can effectively inhibit the problems of heat diffusion and thermal runaway, and improve the thermal safety and other performance of the battery assembly.

The invention discloses a high-safety cylindrical battery structure, and relates to the technical field of new energy batteries, the high-safety cylindrical battery structure comprises a shell, the cylindrical battery structure further comprises a naked battery cell, the naked battery cell is arranged in the shell, a positive pole lug and a negative pole lug are arranged at the two ends of the naked battery cell, and liquid injection holes are formed in the positive pole lug and the negative pole lug; the three sinking tables are arranged at the bottom of the shell at equal intervals; the explosion-proof valve is designed at the bottom of the shell, the thermoelectric separation effect can be achieved, the explosion-proof valve is integrally formed in the shell stretching forming process, the position of the explosion-proof valve is thinned, the situation that the position of the explosion-proof valve is damaged in the production line assembling or actual stress process of the explosion-proof valve of the shell can be avoided, the explosion-proof valve area is thinned, and the reliability of the shell is improved. And under the conditions of thermal safety or thermal runaway of the battery, the anti-explosion valve is most likely to become a stress concentration position and can be opened in time for battery pressure relief, so that the safety requirement is met.

The application discloses a new energy automobile distributed energy collaborative management system and method, relates to the technical field of new energy automobile management, and collects a vehicle team alignment state data set for prediction, constructs a vehicle team overall power distribution and energy supplement constraint model according to a prediction result and available power of an energy supplement node, generates a traction power distribution strategy, a regeneration absorption strategy and an energy supplement instruction, and through multi-source data fusion and closed-loop feedback, realizes vehicle team level energy unified scheduling and road section level prediction driving, constructs a collaborative energy constraint model, adopts distributed optimal power distribution and heat load lag compensation mechanism, realizes dynamic balance of traction, regeneration and cooling, and through backfill correction and adaptive adjustment of energy supplement priority, can continuously optimize energy distribution strategy, significantly improves vehicle team energy efficiency, heat safety and limited road section passing stability, and is suitable for new energy automobile teams operating in a closed and controlled road environment.

The invention relates to the technical field of machine room safety control, and particularly discloses a hospital machine room safety compliance control platform and method based on integrated management, and the system integrates three core modules: a heat dissipation safety compliance analysis module, a heat dissipation safety management module and a heat dissipation parameter pre-control module. The heat dissipation safety compliance analysis module constructs a thermal management atlas by collecting thermal imaging data and operation parameters, accurately analyzes the heat dissipation safety compliance degree, effectively prevents the overheating risk of a machine room, and guarantees the stable operation of equipment. The heat dissipation safety management module integrates the refrigeration equipment parameters and the heat dissipation safety compliance degree, timely identifies and processes heat dissipation abnormity and improves the heat dissipation efficiency of the machine room, and the heat dissipation parameter pre-control module predicts the heat dissipation safety trend in advance and pre-adjusts the refrigeration equipment heat dissipation parameters, so that energy conservation and consumption reduction are achieved, and meanwhile the heat dissipation efficiency of the machine room is improved. And through intelligent management, the heat dissipation safety compliance and the energy efficiency ratio of the hospital machine room are remarkably improved.

The invention relates to the technical field of power supply and distribution systems, and discloses a state-aware undisturbed switching control method for a heat pipe cooling double-loop system, which comprises the following steps of: acquiring a hot node temperature and a steady-state integral operator value of a main heat dissipation distribution branch for representing a power load heat dissipation state, and synchronously monitoring cold-state temperature response data of a standby branch; constructing a dynamic thermal resistance topological model and substituting a steady-state integral operator numerical value to inversely calculate an integral preset initial value; according to the invention, the switching logic is reconstructed to an automatic control function unit logic domain, a mechanical execution dead zone and phase change latent heat hysteresis are cooperatively eliminated, and the thermal power regulation execution unit is controlled to be stable and reliable. Transient thermal pulsation of a power distribution environment is suppressed, and thermal safety of a high-power load power supply link is guaranteed.

This invention relates to a thermal control method for grid-connected converters that balances low harmonics and junction temperature limitations, belonging to the field of intelligent power electronics control. It employs a DPWM modulation method that locks the optimal clamping interval under overload conditions and couples this method with switching frequency control. Offline simulation is used to scan the switching frequency, obtaining data on the peak junction temperature and grid current variations as a function of the switching frequency, which is then stored in a lookup table accessible to the controller. During operation, feasible switching frequency ranges are selected based on junction temperature and dual constraints, and a recommended switching frequency range is provided. Within the acceptable frequency range, the optimal frequency reduction point is selected according to a proposed selection function, thus achieving a dynamic trade-off between thermal safety and system performance during overload. This invention, by fully considering the coupling effect of DPWM and frequency reduction, provides the optimal operating frequency point to ensure the safe and compliant operation of the converter under overload conditions.

This application belongs to the field of new energy battery technology, specifically relating to a functional coating, a separator, and a secondary battery. The functional coating provided in this application includes a functional material, which comprises a carboxylate with the chemical formula (RCOO). x (OH) y M is a metal ion with a valence of 1-3, x is 1, 2, or 3, y is 0 or 1, and R is an aliphatic hydrocarbon group with 9-20 carbon atoms; the mass content of M is denoted as m% based on the mass of the functional coating, satisfying: 1≤m≤30. The functional coating provided in this application enables the battery to reduce micro-short circuits and has better fast charging performance, thermal safety, and cycle performance.