112 results about "Thermal safety" patented technology

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.

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.

This invention provides a vision-mechanical-thermal-based end-face selection and shaping control system for flexible cylindrical samples, belonging to the field of control system technology. The system includes: a multimodal perception module that acquires 3D point cloud data, normal and tangential contact force, and temperature distribution data of the end face; a geometric modeling and selection definition module that constructs a height residual map based on the point cloud and generates a safe shaping area with boundary setbacks; a region path planning module that calculates the comprehensive cost based on the height residual map and the safe area, and selects the optimal shaping path and initial process parameters; a mechanical-thermal fusion closed-loop control module that integrates force and thermal information during the shaping process to generate end-effector pose correction commands and thermal safety protection signals; and an execution control module that integrates the path and correction commands into a joint torque command and responds to the protection signal to perform deceleration, tool stop, or tool retraction. This invention achieves high-precision selection and shaping of the end face of flexible cylindrical samples and significantly improves processing safety through mechanical-thermal tool health collaborative control.

The present application relates to the field of lithium ion batteries, in particular to a composite cathode material and a preparation method and application thereof.The preparation method provided by the present application comprises the following steps: S1, mixing high-nickel NCA precursors, medium-nickel NCM precursors, lithium sources, bulk doping sources and carbon-coated sources to obtain a precursor mixture; the mass ratio of the high-nickel NCA precursors and the medium-nickel NCM precursors is (6.5:3.5) to (7.5:2.5); the bulk doping source comprises at least one of a cation doping source and an anion doping source; S2, performing multi-stage sintering, annealing and crushing on the precursor mixture to obtain a composite cathode material.The present application successfully prepares a cathode material which is superior to traditional NCA in terms of high capacity, long cycle life, excellent rate performance and excellent thermal safety through the synergistic effect of the core-shell gradient structure design, bulk doping and surface carbon coating, and in combination with a multi-stage sintering process.

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 application belongs to the field of new energy battery technology, specifically relating to a separator and a battery. This application provides a separator, including a base film and a functional layer disposed on at least one surface along the thickness direction of the base film; the functional layer includes barium titanate particles and organic particles, the organic particles comprising nitrogen-containing aromatic heterocyclic compounds; the median volumetric diameter of the barium titanate particles is denoted as D1 μm, and the median volumetric diameter of the organic particles is denoted as D2 μm, satisfying 0.5 ≤ D1 / D2 ≤ 4; the particle size distribution span value of the barium titanate particles is 0.6–1.2; the particle size distribution span value of the organic particles is 0.8–1.5. The separator provided by this application exhibits excellent thermal safety, high-temperature storage, and high-temperature cycling performance, with a significantly improved K-value.

The application relates to the technical field of intelligent thermal management of batteries, and discloses a dynamic thermal management control method and system for a sodium-ion battery module, wherein the dynamic thermal management control method for the sodium-ion battery module comprises the following steps: collecting sparse sensor temperature time sequence data, module current and cell end voltage of each section, online identifying a thermal response coefficient, extracting a voltage abnormality score, and outputting a multi-modal working condition feature sequence; modeling a local Gaussian reference based on a working condition clustering condition, completing Bayesian reconstruction of a full-field thermal distribution and extraction of a thermal field space residual by fusing a physical prior anisotropic Gaussian kernel; combining three residual Mahalanobis distance joint scoring and an internal resistance sensing linear parameter variation state equation to predict a full-field thermal evolution trajectory of each candidate strategy, and outputting a cooling area fan rotating speed gear control instruction according to a risk level dynamic weighted double-target optimization. The application can identify local thermal abnormalities in a blind area under a sparse temperature measurement layout and take into account thermal safety and thermal uniformity.

This invention relates to an electrolyte for lithium-ion batteries or lithium metal batteries, a method for preparing the electrolyte, and a lithium battery. The electrolyte comprises a lithium salt, an organic solvent, and functional additives, wherein the functional additives include aluminum alkoxide compounds. A battery containing the additives is also provided. Based on the discovery that ethylene carbonate (EC) degrades battery thermal safety under high-temperature thermal abuse conditions, aluminum isopropoxide is innovatively introduced as a functional additive. This additive is stable at room temperature, but under high-temperature thermal abuse scenarios, it can act as a Lewis acid catalyst, specifically catalyzing the ring-opening polymerization reaction of EC in the electrolyte to generate polymer segments. Compared with existing technologies, the electrolyte provided by this invention effectively improves the high-temperature storage performance and thermal shock resistance of the battery without sacrificing its room-temperature electrochemical performance.

This invention belongs to the field of lithium-ion secondary battery technology, specifically relating to a method for transferring a solid electrolyte membrane, an electrode with a solid electrolyte membrane on its surface, and a solid-state battery. This invention obtains an adhesive with both moderate adhesion and high elasticity by compounding polyisobutylene with a styrene-ethylene-butene-styrene block copolymer (SEBS). This adhesive utilizes the synergistic effect of polyisobutylene providing interfacial adhesion and SEBS providing stress buffering, achieving temperature-sensitive transfer control with low-temperature pickup and high-temperature release within a specific temperature range. By adjusting the ratio of polyisobutylene to SEBS, a rigid-tough layer formulation for the positive electrode and a flexible layer formulation for the negative electrode are obtained, further constructing a bilayer solid electrolyte membrane. This invention achieves high-fidelity transfer of the solid electrolyte membrane to the electrode, significantly reducing interfacial defects and short-circuit risks, improving the cycle stability and thermal safety of the battery, and is suitable for the large-scale manufacturing of high-energy-density all-solid-state batteries.

This invention discloses a digital twin multi-field coupled sodium mobile power station air-cooled thermal management system and control method, belonging to the field of electrochemical energy storage thermal management. Addressing the problems of easy leakage in liquid cooling schemes and the inability of traditional air cooling to adapt to deformation under vibration conditions in mobile power stations, this invention proposes using sodium-ion batteries without configuring liquid cooling pipelines. A reduced-order digital twin model based on intrinsic orthogonal decomposition and Galerkin projection is constructed to reconstruct the flow and temperature fields in real time. Microscopic deformation of the air duct is estimated using an inertial measurement unit and extended Kalman filter, combined with Grassmann manifold interpolation for online compensation of the model. A physically constrained LSTM-XGBoost hybrid model is used to predict hotspots, and model predictive control is employed to collaboratively optimize multi-zone variable frequency fans, active air guide louvers, and dynamic spoilers. This invention achieves efficient temperature control and thermal safety early warning for the air-cooled system under vibration conditions, improves temperature consistency, and reduces system complexity and maintenance costs.

The application discloses a safety saddle for moving a heating metal hose, relates to the technical field of safety protection of moving heating, and comprises a saddle mechanism, a limiting mechanism assembled in the saddle mechanism, and a locking mechanism assembled on the periphery of the saddle mechanism. The saddle mechanism comprises a mounting bottom plate, the top of the mounting bottom plate is fixedly connected with a supporting vertical pipe, and the front end of the supporting vertical pipe is provided with a placing groove. The limiting mechanism comprises a movable ring buckle fixedly connected to the inner wall of the supporting vertical pipe, and the inside of the movable ring buckle is provided with a C-shaped clamping groove. The locking mechanism comprises a first fixing seat fixedly connected to one side of the supporting vertical pipe and a second fixing seat fixedly connected to the other side of the supporting vertical pipe. The safety saddle for moving the heating metal hose can realize automatic locking mechanism and double protection through the mutual cooperation among the saddle mechanism, the limiting mechanism and the locking mechanism.

The application 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, a basic sol is prepared through a sol-gel method, and three additives are introduced; the first additive is a boron-silicon oligomer solution, which is used for forming a high-temperature-resistant borosilicate network in the final material; the second additive is a Ti-POSS solution, which is used as an in-situ precursor of a high-temperature infrared light shielding agent and is used for inhibiting the radiation heat transfer of the material at high temperature; the third additive is a phosphazene siloxane solution, which is used for imparting intrinsic flame retardancy and flexibility to the material; subsequently, solvent replacement, surface hydrophobic modification and normal-pressure drying are performed, and a functional conversion and a ceramicization process are completed through heat treatment, so that 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 high-end power battery thermal safety protection.

The application discloses a battery and a manufacturing method thereof, and the battery comprises a positive current collector layer, which is a composite structure with dense normal layers and porous functional layers alternately distributed formed on an aluminum foil substrate through electric field assisted selective etching, a positive electrode sheet coated with positive active material aluminum powder and subjected to formation treatment, and a top cover assembly and a bottom cover assembly connected with the positive and negative electrodes through full-tab cross-section laser welding and full-tab end face laser welding respectively; the manufacturing method comprises the steps of preparing a composite positive current collector layer, coating active material, assembling a battery cell, laser welding and packaging, etc. The specific surface area and ion transmission efficiency are greatly improved through the composite current collector layer structure, the internal resistance and temperature rise are reduced by combining the optimized full-tab welding process, so that the rate performance, cycle stability and thermal safety of the battery are significantly improved, and the battery is suitable for the manufacturing of high-power long-life batteries such as electric vehicles and energy storage systems.

This invention provides a functional slurry and its preparation method, a coated separator, and a lithium-ion battery, belonging to the field of lithium-ion battery technology. The functional slurry prepared by this invention has a low film-forming temperature, stable colloidal particles, no agglomeration, stable coating adhesion, and good uniformity in peel strength. When coated on a separator substrate, it can impart heat-resistant safety performance or electrode adhesion characteristics to the separator: low thermal shrinkage rate at high temperatures, excellent electrode adhesion, high peel strength, and no coating powder shedding during processing. The functional coating prepared using this slurry is firmly bonded to the substrate surface, effectively improving the problem of large fluctuations in coating performance, especially peel strength, under different seasons, temperatures, and geographical conditions. This improves the consistency of coated separator products, improves the consistency of cell performance, increases the yield of separators and cells, and reduces the problem of high cell short-circuit rates caused by coating powder shedding.

The application discloses a kind of multi-layer liquid cooling structure multi-objective optimization design method of power battery, belong to power battery thermal management technical field, including: the three-dimensional model of battery module, multilayer liquid cooling plate and heat-conducting pad is constructed;With the highest temperature in discharge process, maximum temperature difference and energy density as optimization goal, selected liquid cooling plate arrangement span, battery spacing and liquid cooling plate width as design variable;Improved multi-criteria Latin hypercube sampling method is used to generate uniform sample point set;Based on thermal simulation data, a Gaussian process regression surrogate model is constructed, and a multi-objective grey wolf optimization algorithm is used for three-objective collaborative optimization;Finally, the optimal compromise solution considering thermal safety, temperature uniformity and energy density is selected from the Pareto solution set by entropy weight method, and the best structure parameters of the liquid cooling plate are determined.

The present application provides an electrochemical device and an electronic device. The electrochemical device comprises a positive electrode sheet and an electrolyte. The positive electrode sheet comprises a positive electrode current collector, a first material layer and a positive electrode material layer. The first material layer is arranged between the positive electrode current collector and the positive electrode material layer. The first material layer comprises inorganic particles, a first binder, and a first conductive agent. The inorganic particles comprise a metal element. Based on the mass of the first material layer and the positive electrode material layer, the mass percentage of the metal element is M%, wherein 0.3≤M≤4. The electrolyte comprises a first component. The first component comprises at least one of a compound of formula I-1 or a compound of formula II-1. Based on the mass of the electrolyte, the mass percentage of the first component is A%, wherein 40≤A≤85. By means of the described arrangements, the cycling performance of the electrochemical device at high voltage and high temperature can be improved, and the thermal safety performance of the electrochemical device can also be ensured, thereby improving the comprehensive performance of the electrochemical device.

This invention provides a phosphorus-silicon synergistic flame-retardant coolant for immersion liquid cooling and its preparation method, belonging to the field of thermal safety technology for energy storage batteries. The preparation method of the phosphorus-silicon synergistic flame-retardant coolant for immersion liquid cooling includes adding diphenyl phosphate, allyl alcohol, a condensing agent, and an esterification catalyst to a reaction vessel under an inert atmosphere to carry out an esterification reaction, obtaining the intermediate allyl diphenyl phosphate; subsequently, adding 1,1,3,3-tetramethyldisiloxane and a platinum catalyst to the reaction system to carry out a hydrosilylation reaction; after the reaction, purification treatment is performed to obtain a siloxane-bridged phosphate; the obtained siloxane-bridged phosphate is added to a base mineral insulating oil, and a high-efficiency antioxidant is added, followed by uniform mixing to obtain the phosphorus-silicon synergistic flame-retardant coolant. This method can solve the problems of insufficient oxidation stability, easy increase in acid value, and difficulty in simultaneously achieving flame-retardant efficiency and long-term stability in existing coolants under long-term high-temperature operation.

This invention belongs to the field of solid polymer electrolyte technology, specifically relating to a conductive and flame-retardant polymer solid electrolyte, its preparation method, and its application. The preparation method involves first dissolving chopped aramid fibers in an organic solvent and then leaching them to obtain an ANF membrane; then coating the surface of the ANF membrane with an EG / PEO / LiTFSI electrolyte solution and vacuum drying to obtain an EG / PEO@ANF composite solid electrolyte. ANF can reduce the crystallinity of PEO and improve the crystallinity of Li... + Migration behavior in solid electrolytes; as a reinforcing framework, it effectively improves the mechanical strength and thermal stability of solid electrolytes and inhibits the growth of lithium dendrites; the introduction of EG as a flame-retardant filler significantly improves the thermal safety performance of solid electrolytes under high temperature or combustion conditions; it can also distribute charges uniformly in the electrolyte through its conductivity, suppress the phenomenon of excessively high local current density, improve the contact of the electrode / electrolyte interface, reduce the interface impedance, and effectively improve the ionic conductivity of the battery.

The application provides a polyacrylate binder and a preparation method, a silicon-based negative electrode sheet and a secondary battery. The polyacrylate binder is a copolymer containing A structural units, B structural units, C structural units and D structural units, wherein the A structural unit is -CH2-CH(COOH)-, the B structural unit is -CH2-CH(CONH2)-, the C structural unit is -CH2-CH(COOCH2CH2OH)-, the D structural unit is -CH2-C(CH3)(COO-(CH2)3-Si(OR)3)-, R is a C1-C4 alkyl group, a, b, c and d respectively represent the molar fractions of the A structural units, the B structural units, the C structural units and the D structural units and satisfy a+b+c+d=1, and 0.4≤a / (a+b+c)≤0.6, 0.3≤b / (a+b+c)≤0.5, 0.05≤c / (a+b+c)≤0.15, and 0.005≤d / (a+b+c+d)≤0.05. The polyacrylate binder can form a dynamic cross-linking network inside the electrode, effectively buffers the volume expansion stress of silicon, and realizes self-repairing after damage, thereby significantly improving the cycle life of the battery. In addition, the polyacrylate binder has good flame retardant performance and can improve the thermal safety of the battery.

A vehicle battery protection device for preserving the charge of the vehicle battery is electrically connectable between a vehicle battery and a vehicle electrical system. The device includes a solid-state switch commandable between an on state and an off state. A thermal safety algorithm executable by the device may include a switch derating process, a thermal analysis calibration, a vehicle profile function, and a data reconciliation function. The device employs hardware and software solutions to reduce the risk of thermal runaways and component failures in the device, while maximizing its useful operating envelope. The software solutions may include predicting future thermal loads for the device based on vehicle usage patterns specific to the vehicle within which the device is installed. Those predictions may be used to generate risk datasets which influence whether and to what extent thermal mitigation measures will be employed by the device at any point in time.

The application discloses a kind of composite positive plate and lithium ion battery and preparation method.The composite positive plate includes positive current collector;Positive current collector surface is coated with positive active material layer;Positive active material layer surface is coated with solid electrolyte layer;Positive active material layer includes positive active material, oxide solid electrolyte, conductive agent, dispersing agent and binder and the mass ratio of these components is (91.9%~97.45%): (0.5%~5%): (1%~1.5%): (0.05%~0.1%): (1%~1.5%);Solid electrolyte layer includes oxide solid electrolyte, conductive agent, dispersing agent and binder and the mass ratio of these components is (13.9%~70.9%): (13.2%~49.2%): (0.6%~3.8%): (13.2%~49.2%);The application is conducive to guaranteeing battery thermal safety while significantly improving battery fast-charging capability.

The present application relates to non-electric variable control or regulation system, disclose a kind of sunshade and ventilation collaborative control method based on environmental parameter analysis, comprising: the internal and external temperature difference data of controlled environment and the current physical opening of ventilation window are collected, asymmetric following calculation is executed to generate virtual opening value;With virtual opening value and internal and external temperature difference data, in the preset heat dissipation characteristic data table index maximum allowed heat dissipation power is obtained, and it is defined as the upper limit of sunshade light transmission amount allowed;Real-time monitoring sunshade light transmission amount target instruction, when the input power corresponding to target instruction is greater than the upper limit of sunshade light transmission amount allowed, the driving signal of sunshade device is limited within the upper limit of sunshade light transmission amount allowed, the present application establishes asymmetric energy permission mechanism based on physical response time lag, avoids the risk of controlled environment temperature transient overshoot caused by actuator action lag or flow field unsteady state, realizes the heat safety protection of precision light and heat sensitive environment.

This invention discloses a thermal management control method and device for vehicles, as well as a vehicle itself. The thermal management control method includes: when the vehicle is traveling in a sand-buried environment, controlling the thermal management circuit to activate the maximum cooling mode; in the maximum cooling mode, the battery inlet temperature of the thermal management circuit is at the lowest preset temperature, and the cooling efficiency of the thermal management circuit is maximized. This allows the thermal management circuit to provide the strongest cooling effect to the battery, thereby reducing battery pack overheating and improving battery safety. Without increasing hardware costs, the improved control method significantly enhances the battery thermal safety redundancy of electric vehicles in extreme desert off-road scenarios, demonstrating significant practical value.

The present application relates to the technical field of smart grid industry, in particular to a new energy power consumption system and a dispatching method based on multi-time scale coordination. Through analyzing the correlation between the heat source and the end temperature sequence in the volume domain to determine the dynamic delay, and screening the stable working condition to identify the steady-state heat dissipation benchmark; then combining the dynamic delay and the steady-state benchmark to quantify the pipe wall heat buffer coefficient, generating a temperature down-regulation safety boundary curve, and finally executing heat source regulation according to the curve, which can improve the new energy consumption capacity of the combined heat and power unit under the premise of ensuring the safety of heating.

The application provides a kind of intelligent power battery and control method, intelligent power battery includes: perception module, diagnostic module, regulation and control module and response module;Perception module collects battery multidimensional full level state data and is transmitted to diagnostic module, diagnostic module fuses multiple-source data and completes battery state evaluation, fault diagnosis and risk prediction by intelligent algorithm, regulation and control module carries out active self-adapting intervention to battery operating state and control parameter according to diagnostic result, response module autonomously or controlledly completes battery damage repair and thermal safety protection action.The application can realize the intelligent active management of the whole life cycle of power battery, significantly optimize battery operating condition, inhibit performance degradation, avoid safety hazards, effectively improve the operating stability, use safety and cycle service life of power battery.

This invention provides an on-board thermal management system and a vehicle. The vehicle includes the on-board thermal management system, which comprises an air conditioning heat exchange module, a battery heat exchange module, a motor heat exchange module, an oil pump heat exchange module, and a controller. The motor heat exchange module includes a connected drive heat exchange circuit and a drive module, with the drive heat exchange circuit exchanging heat with the condenser. The oil pump heat exchange module includes a connected oil pump heat exchange circuit, an oil pump, and an oil cooling heat exchange device, with the oil cooling heat exchange device exchanging heat with the condenser. The controller is communicatively connected to the air conditioning heat exchange module, the battery heat exchange module, the motor heat exchange module, and the oil pump heat exchange module. This embodiment integrates the passenger compartment comfort requirements with the thermal safety requirements of the power battery, drive system, and auxiliary oil pump onto the same platform, utilizing a shared condenser and adjustable heat exchange branches to distribute cooling resources, thereby improving system integration and energy utilization efficiency. This not only reduces the number of components but also improves energy utilization.

This application relates to the field of new energy technology and provides a temperature homogenization structure, a high-efficiency temperature homogenization structure, a thermal safety structure, a battery module, and a manufacturing method. The temperature homogenization structure includes multiple heat pipes, a temperature homogenization section, and a liquid medium. Each heat pipe includes an outer shell and an inner cylindrical cavity. The outer shell is arranged circumferentially around the side shell and is close to the outer hot surface of the side shell. A longitudinal first abutment line or first abutment surface is formed on the outer shell. High heat flux is present at least in the radial path between the outer shell and the inner cylindrical cavity and between the outer hot surface and the side shell at the position of the first abutment line or first abutment surface. The temperature homogenization section has a confluence cavity that is fluidly connected to all the inner cylindrical cavities. The liquid medium is disposed in the inner cylindrical cavity and flows and mixes in the confluence cavity. This reduces the temperature difference between different parts of the battery cell circumferentially, the temperature difference between different parts of the battery cell longitudinally, and the temperature difference between battery cells at different locations.

The application relates to the technical field of batteries, in particular to a lithium ion battery, which comprises a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte; the positive electrode sheet comprises a positive electrode current collector and a positive electrode coating arranged on at least one side surface of the positive electrode current collector; the negative electrode sheet comprises a negative electrode current collector and a negative electrode coating arranged on at least one side surface of the negative electrode current collector; at least one of the positive electrode sheet and the negative electrode sheet further comprises a PTC functional layer arranged between the positive electrode current collector and the positive electrode coating and / or arranged between the negative electrode current collector and the negative electrode coating; the PTC functional layer has a resistivity temperature coefficient greater than 3.5% within 90 DEG C to 130 DEG C; and the electrolyte comprises a flame retardant. Compared with the prior art, the active limiting effect of the PTC functional layer on abnormal current and the inhibiting effect of the flame retardant in the electrolyte on combustion are coordinated, so that the thermal safety of the lithium ion battery is improved.

This invention discloses a photovoltaic-storage-charging collaborative optimization method and system for extending transformer lifespan, relating to the field of power supply or distribution circuit systems. The method includes: collecting the operating status of the distribution network and calculating the hot spot temperature of the transformer windings to determine thermal overload; disconnecting non-critical loads during overload; forming candidate restoration access schemes based on the transformer's heat dissipation trend after disconnection and the current increment of the high-priority loads to be restored, and performing thermal safety margin verification; if the verification fails, calling the energy storage system for discharge support and re-verifying; after successful verification, closing the distribution switch step by step, and executing pause, delay, or rollback actions based on real-time thermal status and current feedback. This invention, through multi-dimensional pre-verification and energy storage discharge linkage, effectively suppresses the vicious cycle from overload to unloading to restoration to re-overload, reduces the equivalent power supply pressure on the transformer, and improves the power supply continuity and equipment safety during the thermal recovery phase of the photovoltaic-storage-charging network.