151 results about "Polarization voltage" patented technology

The invention relates to the technical field of battery management, and particularly discloses a dynamic control method for an intelligent balance management system of a lithium battery module, which comprises the following steps of: acquiring load current of the battery module and end voltage signals of each monomer in real time; calculating instantaneous internal resistance and polarization voltage parameters of each single battery in real time; the terminal voltage is compensated in real time, and a purified open-circuit voltage signal is generated; fusing the charge state reference value with the current integral result, dynamically calculating a confidence index according to a current standing condition and voltage stability so as to perform adaptive weighting, and outputting a smooth charge state estimation value; calculating a balance urgency degree index by combining the estimated value, the real-time temperature and the inconsistency change trend, and generating a differentiated balance control instruction; an energy transfer path is established and controlled according to the instruction, the rate is dynamically adjusted in the process, and operation is terminated when the duration or state consistency condition is met; according to the method, the stability of state estimation and the accuracy, safety and efficiency of balance control under the dynamic working condition are improved.

The invention relates to a doped modified argyrodite type solid electrolyte and a preparation method thereof, and belongs to the technical field of all-solid-state battery materials. The chemical formula of the electrolyte is Li < 5.5 + 2x + 2y > P < 1-x-y > Y < x > Bi < y > S < 4.5-1.5 x-1.5 y > O < 1.5 x + 1.5 y > Cl < 1.5 >, x is greater than or equal to 0.01 and less than or equal to 0.04, and y is greater than or equal to 0.01 and less than or equal to 0.04; the yttrium element and the bismuth element are doped at the P site of the argyrodite type electrolyte, and the oxygen element is doped at the S site of the argyrodite type electrolyte. After the argyrodite type electrolyte is in contact with metal lithium, an interface protection layer rich in lithium oxide can be formed in situ at an interface in a circulating process, so that lithium can be uniformly deposited, the generation of interface side reaction is inhibited, the interface stability of the argyrodite type electrolyte to a lithium metal negative electrode is improved, and the polarization voltage of a symmetrical battery is reduced; and the cycling stability of the all-solid-state lithium metal battery is enhanced.

The invention belongs to the technical field of battery state detection, and discloses a lead-acid battery health assessment method and system based on simulated working conditions. Comprising the steps of collecting lead-acid battery simulation operation data and performing data cleaning to obtain high-quality battery data; screening recovery effect data and removing the recovery effect data from the high-quality battery data to obtain disturbance-removed battery data; performing polarization voltage compensation to generate voltage compensation battery data; abnormal impact identification is executed, abnormal data filtering is carried out on the voltage compensation battery data based on an identification result, and reasonable battery data is output; identifying long-period data and performing risk judgment to obtain corrected battery data and cover corresponding data in the reasonable battery data to obtain differentiated battery data; performing health state evaluation on the differentiated battery data, and outputting health indexes of the lead-acid battery; and the evaluation accuracy of the real health level of the battery under the simulated working condition is remarkably improved.

The invention belongs to the technical field of battery detection, and particularly discloses a fuel cell performance evaluation method, system and device and a medium, and the method comprises the steps: collecting the multi-source feature data of a to-be-detected fuel cell in real time; carrying out preprocessing on the multi-source feature data; inputting the preprocessed multi-source characteristic data into an electrochemical-thermodynamic coupling model, and calculating to obtain an activation polarization voltage, an ohmic loss voltage and a concentration polarization voltage; and inputting the multi-modal input features into a pre-trained fuel cell performance health state evaluation model to evaluate the health state index and the remaining service life of the fuel cell to be tested. The accuracy of fuel cell health state and service life detection can be improved.

The invention belongs to the technical field of battery management systems, and particularly relates to a battery state-of-charge estimation method for resisting a voltage sensor fault, which comprises the following steps: S1, data acquisition and system initialization; s2, state prediction; s3, measurement updating and online compensation are carried out; and S4, recursive circulation is carried out. According to the method, the direct-current bias quantity generated by a voltage sensor due to zero drift is widened into a state variable of a battery model, and the state variable, ohm internal resistance, polarization internal resistance, polarization voltage and charge state of a battery jointly form an expansion state vector; and performing real-time recursive estimation on the extended state vector by adopting an unscented Kalman filtering algorithm, and simultaneously obtaining an estimated value of the offset of the sensor and an estimated value of the SOC of the battery subjected to deviation compensation. Through combination of state extension and unscented Kalman filtering, fault bias of the voltage sensor can be identified and compensated online, non-Gaussian noise interference is effectively suppressed, and accuracy and robustness of battery SOC estimation in a complex industrial environment are remarkably improved.

A piezoelectric actuator comprises a stack of a plurality of piezoelectric films, a piezoelectric element having electrodes disposed between the piezoelectric films and at both end surfaces, and a drive circuit. Each of the plurality of piezoelectric films has asymmetric polarization-voltage hysteresis characteristics with two different absolute values of coercive voltage. The drive circuit applies a unipolar voltage waveform that generates an electric field in the same direction as the direction of spontaneous polarization in at least one layer from among the plurality of piezoelectric films and generates an electric field in the direction opposite to the direction of spontaneous polarization in the other piezoelectric films. A minimum voltage value V1 having a minimum absolute value in the unipolar voltage waveform is set such that the ratio of the slope T0 at 0 [V] to the slope T1 at the minimum voltage value V1 [V] in a hysteresis curve indicating bipolar polarization-hysteresis characteristics in another piezoelectric film satisfies |T0 / T1| ≥ 1.5.

The invention relates to the technical field of fuel cell control, in particular to a staged optimization control method for a fuel cell cold start-up process, which comprises the following steps of: acquiring output voltage and current of an electric pile and a cooling liquid inlet temperature signal in real time at the initial start-up stage, calculating a dynamic load impedance amplitude and inputting the dynamic load impedance amplitude into a polarization characteristic coupling estimation model; ohm, activation and concentration polarization voltage drop estimation values are obtained. And comparing the three types of estimated values with a preset polarization threshold to determine a polarization dominant stage, and calling corresponding temperature and humidity control parameters from a preset control strategy mapping table in combination with the cooling liquid inlet temperature. According to the method, polarization stages are accurately divided through polarization decoupling estimation, the control parameters are matched based on the mapping relation, the cold start control logic of the fuel cell is optimized, and the suitability of the cold start control of the stack and the actual operation state is improved.

Disclosed is an apparatus and method for controlling step charging of a secondary battery. A charging control unit determines a SOC, an OCV and a polarization voltage of the secondary battery, determines an OCV deviation corresponding to a difference between the OCV and a predefined minimum OCV value, determines a correction factor corresponding to the polarization voltage and the OCV deviation, determines a look-up SOC by correcting the SOC according to the correction factor, determines the magnitude of a charging current corresponding to the look-up SOC, and provides the determined charging current to a charging device.

The invention discloses a battery equalization control method, device and equipment and a storage medium, and belongs to the technical field of vehicles. The method comprises the following steps: respectively determining a first open-circuit voltage, a second open-circuit voltage, an ohmic internal resistance, a first polarization resistance, a second polarization resistance, a first polarization capacitance, a second polarization capacitance, a first polarization voltage and a second polarization voltage under the condition that a first voltage difference between a highest voltage and a lowest voltage is greater than a first preset threshold value; and determining the first equalization current at different moments, and performing equalization control on the second battery cell based on the first equalization current at different moments. Therefore, the equalizing current determined by the method changes along with time, so that the voltage drop compensation can be increased, the equalizing time of the second battery cell can be prolonged, the voltage difference between the first battery cell and the second battery cell can be shortened to a greater extent, and the charging and discharging performance of the battery can be improved.

The application discloses a multi-target scheduling method of a photovoltaic energy storage hybrid device and relates to the technical field of new energy energy storage. The method comprises the following steps: monitoring the irradiance fluctuation characteristics of a photovoltaic power generation area in real time to lock the fluctuation risk; in response to a risk trigger signal, calculating the internal concentration polarization voltage of a battery in real time and quantifying the polarization approximation degree; based on the polarization approximation degree, using a gradual barrier model with nonlinear growth characteristics to calculate the length of the forced static period; and finally generating a pulse power instruction sequence composed of working pulses and forced static periods alternately. The application inserts a physical static time window when the micro electrochemical boundary approaches a critical point, uses the spontaneous diffusion of ions to eliminate accumulated concentration polarization, thereby meeting the rigid power support demand of the power grid while avoiding triggering the overvoltage protection of the battery, and realizing high-fidelity execution of the scheduling instruction.

The invention relates to the technical field of battery detection, in particular to an open-circuit voltage fitting method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining test data obtained through the pulse charging and discharging test of a battery; according to the test data, a first model parameter in a target fitting model is assigned, in the target fitting model, a battery end voltage is equal to the superposition of an ohm voltage drop, a charge transfer polarization voltage drop, a diffusion polarization voltage drop and an open-circuit voltage, and a second model parameter in the target fitting model is assigned; the first model parameters comprise ohmic impedance in the ohmic voltage drop, reaction impedance in the charge transfer polarization voltage drop and diffusion impedance in the diffusion polarization voltage drop; and on the basis of the target fitting model, open-circuit voltages of the battery in different charge states are obtained, and the different charge states correspond to different battery terminal voltages. Therefore, the estimation speed of the open-circuit voltage and the prediction accuracy of the open-circuit voltage are improved by adopting a pulse charging and discharging test and model fitting mode.

The utility model discloses a metformin hydrochloride electrochemical analysis device which comprises a shell, and one side of the shell is provided with an electric sensor interface; the power supply unit is arranged in the shell and is used for generating polarization voltage; the silk-screen printing electrode electric sensor is electrically connected with the power supply unit and comprises a flexible electrode base body, a working electrode, a counter electrode, a reference electrode, an insulating layer, a wiring terminal and an electrode connecting wire, and the working electrode, the counter electrode, the reference electrode, the insulating layer, the wiring terminal and the electrode connecting wire are arranged on the flexible electrode base body; the surface of the working electrode is modified with an imprinted polymer with selective recognition on metformin hydrochloride; the signal processing unit is arranged in the shell and comprises a shunt resistor, an operational amplifier, a signal converter, a data storage chip and a microprocessor which are electrically connected in sequence; the display screen is electrically connected with the microprocessor and is used for displaying the converted concentration value; the method has the advantages that the metformin hydrochloride can be rapidly and accurately detected, and the use is relatively convenient.

The invention belongs to the technical field of energy materials, and discloses a preparation method of a zinc-based porous organic polymer coating and application of the zinc-based porous organic polymer coating to protection of a zinc negative electrode. Reaction raw materials of the zinc-based porous organic polymer provided by the invention are cheap soluble zinc salt and pyromellitic acid, and the zinc-based porous organic polymer is obtained through a one-step solvothermal reaction. Polyvinylidene fluoride (PVDF) is adopted as a binder, and Zn-POPs is loaded on the surface of the zinc negative electrode in the modes of spin coating, blade coating, spray coating and the like. According to the Zn-POPs protective coating provided by the invention, the concentration distribution of zinc ions on an interface can be dynamically regulated and controlled by an unsaturated coordinate bond, and a dendrite-free zinc negative electrode is realized. Meanwhile, the coating can isolate direct contact between the electrolyte and the negative electrode, so that corrosion of the zinc negative electrode and generation of byproducts are reduced; when the coating is applied to a symmetric battery and a total battery, the battery can show low polarization voltage and stable cycle performance, the advantages of the coating are further highlighted, and subsequent large-scale industrial production can be expected.

The invention relates to the technical field of lithium ion batteries, and discloses an electrostatic spinning fiber coated lithium iron phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a lithium ion battery, the positive electrode material comprises lithium iron phosphate and electrostatic spinning fiber according to a mass ratio of 90-98: 1; the electrostatic spinning fiber is obtained by electrostatic spinning of a spinning solution containing polyethylene oxide and a conductive agent; on the basis of the total mass of the spinning solution, the content of polyethylene oxide is 2-10 wt%, and the content of the conductive agent is 0.2-10 wt%; the conductivity of the conductive agent is 800-2000 S / cm, and the specific surface area is 0.1-50 m < 2 > / g. When the polyethylene oxide nanofiber modified lithium iron phosphate positive electrode material provided by the invention is used in a lithium ion battery, the polarization voltage of the battery can be reduced, and the voltage efficiency can be improved.

The invention provides an anodic oxidation film layer control method based on electrochemical regulation and control. The method comprises the steps that the metal ion concentration in anodic oxidation electrolyte is monitored in real time; adjusting electrolyte components based on the real-time concentration data; performing forced convection circulation on the electrolyte with optimized components in the vertical direction by driving the electrolyte, and applying a pre-polarization voltage lower than a formal oxidation stage; the method comprises the following steps: immersing a to-be-treated workpiece into an electrolyte with activated components, and applying electrochemical regulation and control based on a four-electrode mode; monitoring the growth rate of the preliminary oxidation film layer in real time; and optimal process parameters are predicted based on the growth rate data, and electrochemical regulation and control parameters are adjusted according to the optimal process parameters, so that the preliminary oxidation film layer continues to grow, and the anodic oxidation film layer is formed. Effective electrochemical driving force applied to the surface of the workpiece can be accurately controlled, control errors caused by solution resistance and temperature drift are overcome, and therefore high-precision and high-stability control over the oxidation film growth process is achieved.

The application relates to a battery health degree determination method and device and a vehicle, and relates to the technical field of vehicles. The method comprises the following steps: determining a first polarization voltage peak value of a target battery in a first state of charge interval and a second polarization voltage peak value of the target battery in a second state of charge interval based on a charging curve of the target battery; wherein the charging curve is used for characterizing a curve of a mapping relationship between a charging capacity and a charging voltage of the target battery; the first state of charge interval refers to a state of charge interval with insufficient state of charge; the second state of charge interval refers to a state of charge interval not with insufficient state of charge; and determining the health degree of the target battery based on a first charging capacity corresponding to the first polarization voltage peak value and a second charging capacity corresponding to the second polarization voltage peak value, so that the estimation accuracy of the battery health degree under complex working conditions can be improved.

The invention provides a lithium battery state-of-charge estimation method based on an extended state observer, and the method comprises the following steps: S1, building a Thevenin equivalent circuit model of a lithium battery system, and obtaining a lithium battery system discrete difference equation containing to-be-identified model parameters and a terminal voltage expression; s2, solving ohmic internal resistance, polarization resistance and polarization capacitance in the Thevenin equivalent circuit model; s3, constructing a lithium battery system state-space equation and an output equation which take the SOC and the polarization voltage as state variables; s4, designing an extended state observer used for observing the system state and the total disturbance; and S2, inputting the online identified and updated model parameters in the S2 into an extended state observer in real time, and performing real-time estimation and dynamic compensation on the state of charge of the lithium battery through the observer. According to the method, online identification of model parameters is realized through the forgetting factor recursive least square method, and estimation errors caused by parameter drift are effectively compensated in combination with the disturbance observation capability of the extended state observer.

The invention relates to a zinc negative electrode with a stannous oxide protective layer constructed based on magnetron sputtering and a preparation method and application of the zinc negative electrode, and belongs to the technical field of aqueous zinc battery materials. The preparation method of the zinc negative electrode for constructing the stannous oxide protective layer based on magnetron sputtering comprises the following steps: depositing a stannous oxide protective layer on the surface of a pretreated zinc substrate in a mixed atmosphere of oxygen and argon by adopting a magnetron sputtering process and taking a metallic tin target as a sputtering source, and then carrying out annealing treatment in an air atmosphere to obtain the zinc negative electrode with the stannous oxide protective layer. Obtaining a finished product. The stannous oxide thin film provided by the invention has good zinc affinity, can induce uniform zinc nucleation and deposition, and has excellent electrochemical stability, so that side reactions such as hydrogen evolution and corrosion can be effectively inhibited; the obtained nano stannous oxide film remarkably reduces the zinc ion migration energy barrier, reduces the polarization voltage and prolongs the cycle life; and the preparation method is simple and convenient in process, controllable in parameters and suitable for large-scale preparation, and has good economical efficiency and application prospects.

The application provides an intelligent charging and discharging management system and method for a lithium battery module, and relates to the technical field of battery charging and discharging management. After detecting a charging connection signal, a relaxation curve of a cell terminal voltage decay over time is collected and fitted to determine a polarization voltage amplitude and a polarization relaxation time constant at the current time; according to the current state of charge, the target state of charge and the maximum allowable charging rate, the theoretical shortest charging time, the waitable time and the latest starting time are calculated; according to the waitable time, the current temperature of the lithium battery module and the current cycle number of the lithium battery module, the highest tolerable polarization voltage value is determined; the waitable time is taken as the upper limit of the time budget, and the polarization voltage amplitude is not greater than the highest tolerable polarization voltage value as a necessary condition, and the earliest time that meets the necessary condition in the time interval from the current time to the latest starting time is taken as the best charging starting time. The charging efficiency of the lithium battery module is improved.

The invention discloses a charging system of a new energy locomotive. The charging system comprises a power grid side data acquisition module, a cable state acquisition module, a battery side data acquisition module, a cable dynamic impedance calculation unit, a polarization voltage correction unit, a closed-loop power control unit and a three-terminal data interaction bus. Each acquisition module establishes a two-way transmission link with the calculation unit, the correction unit and the control unit through a bus, and generates a charging control instruction through coupling operation and correction operation; according to the system, the problem that multi-dimensional state coupling is not considered in the prior art is solved, accurate control over the charging process is achieved, and the charging stability and safety are guaranteed.

The application discloses a battery equalization control method, device, equipment and storage medium, and belongs to the technical field of vehicles. The method determines a first open circuit voltage, a second open circuit voltage, an ohmic internal resistance, a first polarization resistance, a second polarization resistance, a first polarization capacitance, a second polarization capacitance, a first polarization voltage and a second polarization voltage respectively under the condition that a first voltage difference between the highest voltage and the lowest voltage is greater than a first preset threshold value, then determines a first equalization current at different moments based on the parameters, and performs equalization control on the second cell based on the first equalization current at different moments. It can be known that the equalization current determined by the method changes with time, which can increase the voltage drop compensation, prolong the equalization time of the second cell, more greatly shorten the voltage difference between the first cell and the second cell, and thus improve the charging and discharging performance of the battery.

The application relates to the field of oil and gas drilling technology and discloses a kind of angular velocity control method, system, electronic equipment and storage medium, including acquisition motor current signal, generate dynamic compensation voltage signal;Dynamic compensation voltage signal is decomposed into axial drive component and circumferential drive component, corresponding polarization voltage waveform is generated and piezoelectric ceramic actuator is driven, superimposed axial deformation variable and circumferential shear deformation variable are generated, are converted into displacement compensation amount, when displacement compensation direction deviation, inject phase shift amount to correct the deformation direction of piezoelectric ceramic;Real-time acquisition of rotary body rotation angle deviation value and displacement compensation amount feedback data, generate differential speed cooperative control instruction, adjust motor speed and rotary body rotation angle, verify that rotary body rotation angle deviation converges to preset deviation range, and update displacement compensation amount generation logic based on convergence result feedback.The application can correct transmission chain gap error in real time, realize accurate matching of rotary body angular velocity and target value.

The invention discloses a graded regulation and control electrolyte for improving the low-temperature performance of a lithium iron phosphate-based lithium ion battery and a preparation method of the graded regulation and control electrolyte, and belongs to the technical field of lithium ion batteries. The electrolyte is prepared from the following components in percentage by mass: 70 to 90 percent of solvent system, 10 to 25 percent of lithium salt and 0.5 to 2 percent of functional additive, a solvent system comprises fluoroethylene carbonate as an inner shell layer, low-melting-point carboxylic ester as a middle layer and a mixture of two chain carbonates as a base layer. According to the electrolyte, the capacity retention ratio of the LFP battery at-30 DEG C is remarkably improved, the polarization voltage is reduced, the cycling stability is improved through graded regulation and control of a solvation structure, and the electrolyte is simple in preparation process and suitable for large-scale production.

The invention provides a battery module state estimation method considering functional state dynamic characteristics, and relates to the technical field of battery management. The method comprises the following steps: collecting characteristic parameters of a single battery, and calculating polarization voltage in the battery; according to the factors affecting the state estimation of the battery module, a state-of-charge model representing the short-time scale characteristic of the battery and a state-of-health model representing the long-time scale characteristic of the battery are constructed respectively; establishing a functional state dynamic model of the single battery and a state estimation model under a dual-time scale; and expanding the functional state dynamic model of the single battery and the state estimation model under the dual-time scale to a battery module level, and establishing the functional state dynamic model of the battery module and the state estimation model under the dual-time scale so as to calculate the state estimation value and the functional state of the battery module. According to the invention, the accuracy and dynamic response capability of battery state estimation are effectively improved, and a basis is provided for long-term health management of the battery.

The invention discloses a power regulation and control method and device of an energy storage battery and electronic equipment, and relates to the field of battery management. The method comprises the following steps: monitoring a first state parameter of a battery in real time, and constructing a multi-dimensional state space reflecting electrochemical activity attenuation and thermal runaway risk of the battery according to the first state parameter; wherein the state parameters comprise a thermal diffusion gradient, a polarization voltage abrupt change rate and a gas release rate; dynamically judging whether a power reduction mode is triggered or not according to the multi-dimensional state space; and when the power reduction mode is triggered, carrying out stepped power reduction operation on the battery until the output / input current of the battery is reduced to the load holding current. The technical problem that in the prior art, a single index is adopted for power management and control in battery management, charging and discharging may be stopped too early, and consequently part of actually available capacity cannot be utilized or battery life management is not facilitated is solved.

This application relates to a method, apparatus, computer device, and storage medium for diagnosing battery faults. The method acquires the operating signal of the battery under test and then inputs this signal into a fault diagnosis model for fault diagnosis, obtaining a diagnostic result. The operating signal includes the operating voltage and / or polarization voltage of the battery under test. The fault diagnosis model is trained based on a sample dataset, which is generated from a battery model corresponding to the battery under test. This method generates a large number of sample datasets using the battery model and then uses these datasets to train a high-accuracy fault diagnosis model, thus improving the accuracy of fault diagnosis.

A method for measuring DC bias aging characteristics of a multilayer capacitor includes applying a first poling voltage to a multilayer capacitor including a body having a dielectric layer including a plurality of dielectric grains and an internal electrode disposed alternately with the dielectric layer in a first direction, and an external electrode disposed on the body, maintaining the first poling voltage for a first period of time (t1), applying a DC bias voltage lower than the first poling voltage, maintaining the DC bias voltage for a second period of time (t2), and measuring saturated capacitance after the DC bias voltage is applied.

This invention discloses a DSP-based multi-segment intelligent charging strategy switching system, relating to the field of battery charging control technology. It addresses the problem of adaptively controlling current switching during multi-segment constant current charging to prevent voltage over-limit interruptions while minimizing switching time to improve charging efficiency. The system includes: acquiring the battery's reference impedance, sampled current, and sampled voltage during the current switching cycle; determining the linear voltage change of the battery during the current control cycle based on the change in sampled current and the reference impedance, and determining the polarization voltage component of the battery during the current control cycle based on the change in sampled current; determining a virtual impedance index based on the polarization voltage component, sampled voltage, and charging cutoff voltage threshold; and determining the allowable charging current adjustment step size during the current control cycle based on a preset voltage fluctuation budget value and the virtual impedance index, and updating the target charging current command accordingly.

The invention discloses a one-dimensional RuCu / Cu composite nanomaterial induced by a composite medium and a preparation method and application thereof, the composite medium is a mixed solution of DMF and deionized water, and the microstructure of the one-dimensional RuCu / Cu composite nanomaterial is composed of a Cu nanowire and RuCu nanoparticles evenly distributed on the surface of the Cu nanowire. DMF and deionized water are used as a mixed solvent, a Cu2O intermediate is generated through induction, and finally the one-dimensional RuCu / Cu nanowire composite material is generated. The Li-CO2 battery based on the one-dimensional RuCu / Cu nanowire composite material shows low charge-discharge polarization voltage, excellent cycling stability and good rate capability, and has a wide application prospect in the field of Li-CO2 battery electrode materials.

This invention discloses a method, apparatus, device, and storage medium for the operation and management of lithium-ion batteries, belonging to the field of lithium-ion battery management technology. The method involves: collecting the rated capacity, equivalent circuit ohmic internal resistance, current terminal voltage, operating current sequence from a preset initial time to the current time, and current operating temperature of the lithium-ion battery; calculating the charge / discharge rate at the current time based on the current operating current and the rated capacity; inputting the collected data and the current charge / discharge rate into a preset inversion model, so that the inversion model calculates the current state of charge, current open-circuit voltage, and current polarization voltage difference, thereby reversing the battery polarization power, positive electrode rated capacity, and negative electrode rated capacity, and thus managing the operation of the lithium-ion battery based on the battery polarization power, positive electrode rated capacity, and negative electrode rated capacity. This invention solves the problem of low accuracy in lithium-ion battery management in existing technologies.