345 results about "Capacity loss" patented technology

The invention relates to the technical field of energy scheduling, and discloses a smart city energy dynamic scheduling system and method based on big data analysis, and the method comprises the following steps: the operation state of a transformer substation, the basic parameters of a charging pile and regional load prediction data are collected in real time, data cleaning and abnormal value filtering are carried out; constructing a complete power grid-charging facility dynamic information base; calculating the power supply margin of each region based on the capacity loss of the faulty transformer substation, establishing a weight scoring system of charging pile power adjustment in combination with the charging demand urgency, and determining the reduction or recovery priority of each charging load; and generating a charging pile power adjustment instruction through a multi-target optimization model, and iteratively correcting a power distribution scheme and generating a final scheduling instruction set by taking minimization of user satisfaction loss as a target while meeting the power grid capacity. According to the invention, by constructing a dynamic response mechanism and a multi-target collaborative optimization model, accurate and rapid regulation and control of the traffic load are realized in the scene of sudden power shortage of the power grid.

The invention discloses a battery safety risk grade early warning and evaluation method, and relates to the technical field of lithium ion batteries, and the method comprises the steps: collecting battery operation data, carrying out the processing to obtain a capacity attenuation characteristic and an internal resistance growth characteristic, and obtaining a degradation characteristic parameter related to the temperature through an Arrhenius model; estimating capacity loss trends at different temperatures and time; inputting the multi-source time sequence data into a long short-term memory network, and predicting the capacity and internal resistance change of a plurality of cycles in the future; and in combination with a life end criterion, calculating the remaining service life, fusing the remaining service life with the degradation index of the aging model and the degradation index of the capacity model, generating a safety state index, and outputting a battery safety risk grade and corresponding early warning information. According to the invention, overall safety risk assessment can be provided for the whole battery system, accurate monitoring and early warning can be carried out on the single batteries or local modules, and the safety and reliability of battery operation can be improved.

Understanding a health status and expected remaining lifetime of an EV (electric vehicle) battery is important before repurposing the battery for second life applications. A device for connecting to an unopened EV battery pack via operable coupling to signal and power wiring is disclosed. The device enables access to diagnostic information from the unopened EV battery. The device measures cell and / or module voltages and currents within the battery pack for several different depths of discharge. A self-learning algorithm implemented by the diagnostic device, which uses historical data and diagnostic information from the battery pack, determines a condition of the battery and provide recommended operational conditions for future use of the battery. For example, a degradation slope and expected capacity loss over time can be determined based on measured variations of cell and / or modular voltages and subsequently used, with cell impedance data, to recommend an operational C-rate for the battery pack.

The invention discloses a battery capacity loss real-time prediction method based on Arrhenius-LSTM, and the method comprises the steps: S1, collecting the current, voltage, state of charge and temperature data of a vehicle-mounted battery management system, and generating an original time series data set; s2, performing time alignment and capacity calculation on the original time sequence data set to generate a capacity loss sequence; s3, an Arrhenius Arrhenius model is constructed based on the capacity loss sequence, and a physical baseline prediction sequence is generated through temperature related parameter estimation; s4, calculating a difference value between the capacity loss sequence and the physical baseline prediction sequence, and generating a residual sequence; s5, performing feature extraction and time sequence window construction on the residual error sequence to generate an LSTM training data set; s6, inputting the LSTM training data set into the long short-term memory network for training, and generating a residual prediction model; and S7, adding the physical baseline prediction sequence and the output of the residual prediction model to generate a capacity loss prediction result. And the online monitoring and early warning functions of the health state of the battery are realized.

The invention provides a motor controller heating system, a control method thereof and a vehicle, and relates to the technical field of vehicle control, and the method comprises the steps: controlling the conduction states of a first switch module, a second switch module, a third switch module and an inverter, the energy storage element, the inverter, the two-phase winding in the three-phase motor and the power battery are connected in sequence to form a charging and discharging loop of the power battery; obtaining a target current and a target voltage of the power battery, a phase current of a first phase winding in the three-phase motor and a current voltage of the power battery; according to the target current, the target voltage, the current voltage and the phase current, the duty ratio of a control pulse of a first phase bridge arm in an inverter connected with the first phase winding is obtained, the first phase bridge arm is controlled according to the duty ratio so as to adjust the current of a charging and discharging loop, mutual charging and discharging between a power battery and an energy storage element can be achieved, and the charging and discharging efficiency is improved. The heating capacity of the power battery is improved, the capacity loss is reduced, and the current can be accurately controlled.

The invention provides a battery prediction and early warning method and device, and the method can obtain an actually measured expansive force curve of a lithium iron phosphate battery in a charging process, and respectively determines a maximum expansive force value of the actually measured expansive force curve at SOC = about 30% and a maximum expansive force value of the actually measured expansive force curve at SOC = about 100%. And carrying out capacity loss prediction and / or sharp degradation judgment on the lithium iron phosphate battery according to the actual pressure difference between the two expansive forces and a pre-constructed capacity loss model. Therefore, capacity loss prediction and / or rapid degradation early warning can be realized by using the size relationship between the two expansion force peak values and the pressure difference in the charging process based on the charging and discharging platform characteristics of the lithium iron phosphate battery, so that the accuracy of prediction and early warning can be improved.

The invention discloses a sodium-ion battery negative pole piece, a preparation method, a sodium-ion battery and an electric device, the negative pole piece has a layered structure, that is, the negative pole piece comprises a first active layer and a second active layer, and the average interlayer spacing and gram volume of active substance materials in the two active layers meet a certain relational expression. Through the layered design of the pole piece and the specific matching of the active material in the active layer, the sodium-ion battery can give consideration to high gram volume and dynamic performance, the gram volume loss is small, and the dynamic performance is high, so that the comprehensive performance optimization of the sodium-ion battery is realized.

The invention provides an energy storage battery production line process intelligent detection method and system, and relates to the technical field of energy storage battery production detection. Collecting AC impedance and temperature data to generate a performance distribution diagram; performing charging identification on an abnormal area and determining a defect type; carrying out pulse discharge test on the abnormal region to calculate a capacity loss rate; and marking unqualified products according to the capacity loss rate and adjusting process parameters. The method can accurately identify the performance defect of the battery monomer, improve the detection precision and the production efficiency, and effectively reduce the defective product rate.

The invention relates to a battery charging and discharging control method and device, a battery management system and electronic equipment, and the control method comprises the steps that current information of a target battery of a vehicle is obtained, and the current information of the target battery comprises the current temperature of the target battery, the current power consumption of the target battery and the current capacity loss rate of the target battery; determining a first charging and discharging interval of the target battery based on the current temperature of the target battery, the current power consumption of the target battery and the current capacity loss rate of the target battery; and controlling charging and discharging of the target battery based on the first charging and discharging section. According to the method, the SOC of the target battery is controlled within the charging and discharging interval determined by the temperature, the power consumption and the capacity loss rate, so that the rationality, the flexibility and the intelligent degree of charging and discharging interval regulation and control are improved, meanwhile, the service life of the battery is greatly prolonged under different temperature conditions, and the charging and discharging efficiency is improved. And moreover, the safety risk is reduced, the uniformity of capacity distribution is improved, and the resource utilization rate is improved.

The invention belongs to the technical field of batteries, and particularly relates to a sodium ion battery monomer, a positive pole piece, a preparation method thereof and a related device. The sodium ion battery monomer comprises a positive pole piece, the positive pole piece comprises a positive active material and a solid electrolyte interface film at least combined on the surface of the positive active material, and the solid electrolyte interface film comprises one or more cations of Na < + >, Li < + >, K < + > and Ca < 2 + >. The solid electrolyte interface film combined on the surface of the positive electrode active material contains cations such as Na < + >, Li < + >, K < + > and Ca < 2 + >, and the cations can participate in electrochemical reaction of the sodium ion battery, so that reversible capacity is provided, capacity loss generated after the positive electrode active material is passivated is made up, and the cycle performance of the battery is improved. Meanwhile, the solid electrolyte interfacial film containing the cations is beneficial to reducing the impedance of the battery, so that the cycle performance of the battery is further improved.

The invention belongs to the technical field of battery material synthesis, and discloses a sodium ion battery hard carbon negative electrode material, a preparation method of the sodium ion battery hard carbon negative electrode material, a negative electrode and a sodium ion battery. Unsaturated oxygen-containing sites of the hard carbon material are eliminated through calcination under the low-temperature (500-700 DEG C) condition, and the first-circle irreversible capacity loss is reduced; meanwhile, a sodium polyphosphate coating layer is formed in situ, so that the diffusion rate of sodium ions is increased. According to the method, surface modification and coating of the hard carbon material are achieved in one step, the first-week coulombic efficiency of the obtained hard carbon negative electrode material is larger than 89.4%, and the capacity retention rate gt after 200 times of circulation under 200 mA. G <-1 > is achieved; and the rate capability is excellent. The method is simple and controllable in process, low in raw material cost, environment-friendly and suitable for large-scale production.

The invention provides a sulfinate organic positive alkali metal ion supplement for a secondary battery, and relates to the technical field of secondary batteries. The organic positive electrode alkali metal ion supplement has a structure as shown in the following general formula: [R-SO2]-M < + >, wherein M < + > is a metal cation and is selected from at least one of Li < + >, Na < + > and K < + >; [R-SO2]-is a sulfinate anion, and wherein R is an organic group. The supplement compensates irreversible capacity loss by efficiently releasing active ions, so that the energy density of the battery is improved; the oxidation potential is proper, the environmental stability is excellent, and the catalyst is not needed to decompose and easy to process; decomposition products are harmless, an electrode interface can be optimized, and the cycle life of the battery is remarkably prolonged.

The invention belongs to the technical field of preparation of sodium ion battery electrode materials, and provides a high-performance sodium storage material based on Zn-doped modified P2 type sodium nickel manganese oxide, a preparation method and a battery. The invention aims to solve the problems of rapid capacity attenuation under high voltage, obvious volume change in the phase change process, irreversible capacity loss and the like of the existing P2 type sodium nickel manganese oxide material. According to the main technical scheme, through low-concentration Zn doping, the structural stability of the material is optimized, and the electrochemical performance of the material is improved on the premise that voltage, capacity and energy density are not sacrificed. The preparation method comprises the following steps: dissolving a sodium source, a manganese source, a nickel source and a zinc source, adding a complexing agent for reaction, evaporating the solvent to dryness, and performing two-stage calcination to finally obtain the zinc-doped sodium-nickel-manganese oxide with the P2 type layered structure. The material can be used for high-safety sodium ion battery positive electrodes and is widely applied to the fields of energy storage power stations, low-speed electric vehicles and the like.

The invention provides a method for evaluating the cycle performance of a battery cell. Specifically, the evaluation method comprises the following steps: based on a preset cyclic charging and discharging method, carrying out cyclic charging and discharging on a battery cell, and testing the discharge capacities of a first cycle and at least one target cycle; according to the discharge capacity of the first cycle and the discharge capacity of any target cycle, determining a cell capacity retention rate corresponding to the target cycle; wherein the cyclic charging and discharging method comprises an acceleration method, and the acceleration method comprises the following steps: continuously discharging for a preset duration under a preset voltage; wherein the preset voltage is smaller than the minimum working voltage of the battery cell. By controlling the continuous discharge preset duration of the battery cell under the preset voltage, the capacity loss is accelerated, and the capacity distinction degree in unit time is improved, so that the cycle capacity retention ratio difference of different design battery cells is identified in a shorter time, and the iteration period is shortened.

The invention relates to the technical field of lithium battery charging application, and discloses a lithium metal battery service life prolonging method based on a bidirectional pulse charging strategy. According to the method for prolonging the service life of the lithium metal battery based on the bidirectional pulse charging strategy, the deposition of a lithium metal negative electrode in the charging and discharging process of the battery is more uniform and compact by adjusting the frequency, duty ratio, forward and reverse amplitude and the like of the bidirectional pulse charging current, so that the polarization in the battery is improved, the irreversible capacity of the battery is reduced, and the service life of the battery is prolonged. The bidirectional pulse charging method can effectively improve the lithium dendrite precipitation phenomenon of the negative electrode, reduces the internal impedance and irreversible capacity loss of the battery, can improve the cycling stability and safety of the battery, and prolongs the service life of the lithium metal battery.

The invention provides a battery life prediction method, apparatus and device, and a medium, and relates to the technical field of batteries, the method comprises the following steps: obtaining a first historical data set and a second historical data set of a to-be-detected battery within a preset historical time; obtaining a storage capacity loss model, determining to-be-tested parameters of the storage capacity loss model based on the first historical data set, and obtaining a target storage capacity loss model; obtaining a cycle capacity loss model, determining to-be-measured parameters of the cycle capacity loss model based on the second historical data set, and obtaining a target cycle capacity loss model; determining an actual capacity loss model according to the target storage capacity loss model and the target cyclic capacity loss model; determining an actual capacity loss curve according to the actual capacity loss model; and determining the actual battery life of the to-be-tested battery according to the actual capacity loss curve. The prediction accuracy of the battery life is improved.

A composite ion exchange membrane, a preparation method therefor and a use thereof, and a zinc-iodine flow battery. By introducing halogen adducts onto a porous membrane, a composite membrane based on a series of localized high iodine concentration (LHIC) coatings is constructed to suppress the problem of crossover of active polyiodide compounds in a catholyte. Specifically, metal oxides exhibit a strong physicochemical adsorption effect toward halogens, and halogen oxide adducts are formed, the halogen oxide adducts becoming effective halogen carriers. An LHIC coating is constructed on the porous membrane by utilizing the strong adsorption characteristic of the carriers and halogen (such as iodine), thereby enhancing the selectivity of the porous membrane toward iodine species. On the basis of Donnan exclusion and concentration gradient effects, a constructed localized high-concentration membrane can effectively suppress the diffusion of halogens from a positive electrode in a zinc-iodine battery / zinc-bromine battery, mitigating the problem of capacity loss of a zinc-iodine / zinc-bromine flow battery, and achieving long-term cyclic stability.

The invention discloses a method for preparing a negative pole piece through soft contact pre-sodium treatment, the negative pole piece and a sodium ion battery comprising the negative pole piece. The method comprises the steps that a negative pole piece of the sodium ion battery is provided, the negative pole piece comprises a negative current collector and a negative film layer located on at least one side of the negative current collector, and the negative film layer comprises a negative active material; enabling the negative pole piece to be in contact with electrolyte so as to enable the electrolyte to infiltrate the negative pole film layer; a pre-sodium treatment step: enabling sodium metal to be in contact with the negative electrode film layer, and applying pressure to enable part of the sodium metal to react with the negative electrode active material in the presence of the electrolyte; and removing the residual sodium metal to obtain the negative pole piece. According to the invention, soft contact sodium pre-treatment can be carried out on the negative pole piece, so that irreversible capacity loss of sodium ions is made up, and the first coulombic efficiency of the sodium ion battery is improved.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The secondary battery comprises an electrode assembly, the electrode assembly comprises a first pole piece, a diaphragm and second pole pieces which are sequentially stacked in the first direction, and the first pole piece comprises a first double-sided pole piece located between two adjacent second pole pieces; the first double-sided pole piece comprises a first metal foil and first active layers arranged on the two surfaces of the first metal foil in the first direction. The first pole piece further comprises a first single-face pole piece, the pole piece on the outermost layer of the electrode assembly in the first direction is the first single-face pole piece, the first single-face pole piece comprises a first current collector and a second active layer, and the surface, facing the second pole piece, of the first current collector is provided with a second active layer. The first current collector comprises a first polymer layer and a second metal layer which are laminated along a first direction, the 1cm < 2 > unit area resistance value of the first metal foil at 25 DEG C is R1, and the 1cm < 2 > unit area resistance value of the second metal layer at 25 DEG C is R2; and-30 m omega < = R1-R2 < = 15 m omega. According to the secondary battery and the electronic equipment, the problem of capacity loss of the secondary battery can be improved.

The invention provides a method suitable for rapidly evaluating the aging state of a large-scale energy storage power station battery, and belongs to the technical field of battery state evaluation. According to the method, data acquisition is carried out during battery standing, two subsequent interval voltages of standing initial voltage are recorded, equivalent capacity loss instantaneous values at different moments are calculated in combination with a calibration proportionality coefficient and a working condition correction factor, a voltage relaxation integral area is obtained through calculation, and then a health state assessment result and confidence are obtained; the technical means of synchronously collecting the temperature change rate and the internal resistance change value, dynamically allocating weight fusion calculation, and performing evaluation in parallel in the whole station to generate an aging state distribution diagram and an abnormal alarm are adopted, and the method is adaptive to an existing energy storage power station monitoring system, does not need additional transformation, avoids voltage fluctuation to obtain high-quality data, comprehensively represents the battery polarization state, and improves the quality of the battery. The problems that large-scale energy storage power station battery evaluation is low in efficiency, insufficient in precision and lack of a global view angle are solved.

The invention belongs to the field of lithium ion batteries, and discloses a ZIF-67-derived composite lithium oxalate lithium supplement agent and a preparation method and application thereof.The lithium supplement agent comprises a lithium oxalate matrix and a ZIF-67-derived Co-based catalyst, and the ZIF-67-derived Co-based catalyst is evenly distributed on the surfaces of lithium oxalate particles or among crystals to form a composite structure; a water-phase synthesis method is adopted for preparation, ZIF-67 is converted into Co-based nano-particles, the Co-based nano-particles and lithium oxalate particles form a composite structure, the Co-based nano-particles can serve as a positive electrode additive to be applied to a positive electrode of a lithium ion battery, in-situ thermal decomposition / electrolytic reaction occurs in the first charging process of the battery, Li is released to compensate irreversible capacity loss, the decomposition potential can be reduced to 4.0 V or below, and the positive electrode additive can be applied to the positive electrode of the lithium ion battery. The first-time charging efficiency is improved to 90% or above, and the cycling stability is remarkably enhanced.

The invention discloses a niobium-doped and carbon nanotube continuously coated lithium iron nickel phosphate material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The niobium source and the phosphorus source are added step by step, the concentration gradient distribution of the niobium element in the material is realized, and niobium is preferentially doped in the [100] crystal orientation through three-section temperature control sintering, so that the bulk phase conductivity and the lithium ion mobility are remarkably improved, and the capacity loss caused by excessive doping is avoided while the lattice structure is stabilized. In addition, the carbon nanotubes and the nitrogen-containing carbon source have a synergistic effect, Li-N-C covalent bonds are formed on the surface of the material, the interface stability is enhanced, the interface side reaction is effectively inhibited, and the surface conductivity is improved. According to the method, through double modification of doping and coating, the problems of low conductivity and poor cycling stability of the lithium iron nickel phosphate material are successfully solved, and the final product shows excellent rate capability and long cycle life.

The utility model relates to a battery which comprises a positive plate and a negative plate, a negative current collector of the negative plate comprises a polymer layer and metal layers, and the metal layers cover two sides of the polymer layer. The polymer layer comprises a first middle region and a first redundant region; the metal layer comprises a second middle area and a second redundant area, and the thickness of the second middle area is larger than that of the second redundant area. According to the battery provided by the utility model, the second redundant region corresponds to the Overhang region. By reducing the thickness of the metal layer of the negative plate in the second redundant region, the resistance of the second redundant region is improved, the temperature of the Overhang region of the negative plate is improved, and the transmission rate of lithium ions in the Overhang region is improved. Therefore, when the battery reaches the discharge cut-off condition, discharge is more sufficient, and reversible capacity loss and lithium precipitation at the edge of the negative electrode are avoided. And on the other hand, the metal weight in the battery is reduced, the energy storage under the unit weight of the battery is increased, and the energy density is improved.

The invention discloses a Ta-Ti double-gradient doped lithium ion battery high-nickel positive electrode material, a battery and a preparation method, according to the positive electrode material, through a surface-bulk phase partition functional design, Ta < 5 + > is subjected to gradient enrichment on the surface of the material to form a Li-Ta-O protective layer so as to inhibit electrolyte erosion, Ti < 4 + > is uniformly doped in a bulk phase and forms a strong Ti-O bond with an oxygen framework, and the high-nickel positive electrode material can be used for preparing a lithium ion battery. And the lattice structure is synergistically stabilized, Li / Ni mixed arrangement is reduced, the lattice constant is expanded, and a lithium ion diffusion channel is optimized. The positive electrode material has the advantages of high specific capacity, long cycle life and excellent rate capability, and solves the technical bottlenecks of fast cycle attenuation and remarkable capacity loss caused by structural instability and single element doping of the traditional high-nickel material.

The invention relates to the technical field of lithium / sodium ion batteries, in particular to a modified current collector, a preparation method of the modified current collector and a negative-electrode-free secondary battery, the modified current collector comprises a porous metal substrate layer; the deposition layer is formed in the porous metal substrate layer, the deposition layer is formed in the porous metal substrate layer through magnetron sputtering of metal Bi or metal Ag or metal Sn or alloy BiAg or alloy BiSn or alloy BiAgSn, and the deposition layer serves as the negative electrode current collector of the negative electrode-free lithium battery or the negative electrode current collector of the negative electrode-free sodium battery. Volume expansion caused by lithium / sodium deposition can be relieved, generation of dendritic crystals in the circulation process is avoided, the reversibility of lithium / sodium metal deposition / stripping is improved, capacity loss in the circulation process is reduced, the cycle life of the battery is prolonged, and the safety performance of the battery is improved.

The invention provides a high-efficiency micro energy storage module based on an intelligent energy management system and a control method, the high-efficiency micro energy storage module comprises an energy storage unit, a power conversion unit, a dynamic equalization unit, an intelligent control unit and a communication interface unit, the energy storage unit is composed of multiple groups of battery clusters, each group of battery clusters comprises battery modules connected in parallel, bidirectional DC / DC converters are configured between the modules so as to realize inter-cluster energy dynamic balance; the power conversion unit comprises a bidirectional DC / DC converter and a multi-level inverter, and is used for realizing electric energy bidirectional conversion between a DC bus and an AC power grid / load. According to the invention, through the dynamic equalization design of the multiple groups of battery clusters and the bidirectional DC / DC converter, efficient energy distribution between the battery packs is realized, and capacity loss caused by inconsistency between the clusters is reduced; a multi-level inverter and a bidirectional DC / DC converter are integrated, so that the DC / AC electric energy conversion efficiency and the waveform quality are improved; the non-dissipative equalization technology based on SOC / SOH dual monitoring reduces energy loss and prolongs the service life of the battery.

The invention provides a lithium supplement functional diaphragm, a lithium ion battery and a preparation method of the lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium-supplementing functional diaphragm comprises a diaphragm base material and a lithium-supplementing agent functional layer coated on at least one surface of the diaphragm base material, wherein the lithium-supplementing agent functional layer comprises a lithium-supplementing agent, a conductive coating layer and a binder; wherein the conductive coating layer coats the outer surfaces of the lithium supplement agent particles and is used for improving the electronic conductivity and environmental stability of the lithium supplement agent; and moreover, the lithium supplement agent functional layer is configured to be decomposed when the battery is charged and formed for the first time, and released lithium ions migrate to the negative electrode to compensate irreversible capacity loss. The conductive coating layer can effectively isolate moisture and carbon dioxide in air from being in contact with the core of the lithium supplement agent, so that the environmental stability of the lithium supplement agent is enhanced, and the storage and transportation conditions are simplified. The lithium supplementing agent functional layer fundamentally avoids the failure problem of the lithium supplementing agent in the positive electrode slurry preparation and pole piece storage process, and the feasibility and yield of industrial production are greatly improved.

The invention relates to the technical field of lithium ion batteries, in particular to an aging identification method and system based on numerical analysis. Comprising the following steps: S1, extracting intrinsic characteristic parameters of positive and negative electrode material button half cells of the lithium ion battery; s2, obtaining a voltage-capacity curve of the lithium ion three-electrode total battery to be detected, extracting intrinsic characteristic parameters of the lithium ion three-electrode total battery, and comparing and calculating the active material loss of the positive electrode and the negative electrode; s3, calculating the loss of active lithium; s4, calculating impedance capacity loss; and S5, integrating the loss of the active material, the loss of the active lithium and the loss of the impedance capacity, and outputting an aging state evaluation result of the lithium ion battery. According to the method, through a full-process data driving analysis mode, the dimension integrity and model reliability of aging parameter identification are remarkably improved, the interaction mechanism of different aging modes is effectively revealed, and a solution is provided for lithium ion battery health state evaluation.

The invention belongs to the technical field of lithium batteries, and particularly relates to a method for forming an SEI film on the surface of a silicon anode. The invention provides a technical scheme for forming SEI through pulse voltage driving customization, parameters such as pulse voltage amplitude, pulse voltage high and low potential duration time and pulse time are reasonably designed, an SEI film with a specific component proportion and a microstructure is induced to be formed on the surface of an electrode, the first coulombic efficiency of a silicon anode is remarkably improved, and the service life of the silicon anode is prolonged. The irreversible capacity loss is reduced, meanwhile, the interface stability is enhanced, and a brand new SEI regulation and control strategy is provided for the development of the high-energy-density lithium ion battery.