196 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.

The invention discloses a power battery health degree real-time detection method based on pile end charging data, and relates to the technical field of power battery state monitoring, and the method comprises the following steps: S1, collecting the voltage, current, temperature and time sequence data of a power battery output by a charging pile in a charging process in real time; s2, extracting characteristic parameters of a charging curve in a constant-current charging stage from the data in the step S1, wherein the characteristic parameters comprise a voltage inflection point, a charging acceptance rate and a polarization voltage; s3, inputting the characteristic parameters into a pre-trained SOH prediction model to obtain a preliminary SOH prediction value; and S4, correcting the preliminary SOH predicted value by adopting a temperature-multiplying power coupling correction algorithm. According to the method, data such as the voltage, the current and the temperature collected by the charging pile in the charging process are directly utilized for analysis, the operation that a battery needs to be disassembled in a traditional method is avoided, the structural integrity and the sealing performance of the battery are protected, and the safety and the convenience of detection are improved.

The embodiment of the invention provides a battery open-circuit voltage correction method and device, a vehicle, a medium and a product. The method comprises the following steps: when the standing time of a to-be-tested battery represents that the to-be-tested battery does not enter a steady-state response, determining the polarization voltage of the to-be-tested battery in the standing time according to the polarization attenuation degree of the to-be-tested battery; the polarization attenuation degree of the to-be-detected battery is determined according to the standing time and the polarization time constant of the to-be-detected battery; and according to the polarization voltage of the to-be-measured battery in the standing time, correcting the open-circuit voltage of the to-be-measured battery obtained in the standing time to obtain the corrected open-circuit voltage of the to-be-measured battery. The method is used for achieving the effect of improving the measurement accuracy of the OCV.

The invention discloses a paper-based diaphragm for alkaline water electrolysis and a preparation method of the paper-based diaphragm. A PPS / aramid fiber porous base material is prepared by adopting a wet non-woven process, a PVA-polymer quaternary ammonium salt blending layer is constructed on one side of the base material, OH <-> conduction is promoted by utilizing a quaternary ammonium group of polymer quaternary ammonium salt, and a three-dimensional network is formed through glutaraldehyde crosslinking. According to the paper-based diaphragm prepared through the method, when the porosity is 60.4%, the strength still reaches 8.98 MPa, the surface resistance of the diaphragm is greatly reduced to 68 m omega.cm < 2 >, the ionic conductivity synchronously jumps to 515 mS.cm <-1 >, the electrolytic current density is promoted to reach 1474 mA under the polarization voltage of 2.0 V, the vertical swelling rate of the diaphragm is stabilized at 12% through the cross-linked functional layer, and the paper-based diaphragm has the advantages that the paper-based diaphragm can be applied to the field of lithium ion batteries. The diaphragm achieves an optimal balance in key indexes such as aperture, strength, ionic conductivity and alkali liquor stability.

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 lithium ion batteries, in particular to a lithium battery electrolyte additive, an electrolyte and a lithium battery, the lithium battery electrolyte additive comprises lithium trifluoromethanesulfonate and an additive component A. The additive component A has dicyano groups, and the mass ratio of the lithium trifluoromethanesulfonate to the additive component A is (0.5%-1%): (0.5%-1%), anions in the lithium trifluoromethanesulfonate have high oxidation stability and can inhibit oxygenolysis of the electrolyte at high temperature, and meanwhile, the charge delocalization effect of the lithium trifluoromethanesulfonate can improve the transference number of lithium ions and reduce concentration polarization; the dicyano group of the additive component A is preferentially complexed with dissolved transition metal ions, forms a compact interfacial film on the surface of a positive electrode, inhibits side reactions, and cooperates with lithium trifluoromethanesulfonate to reduce the polarization voltage of the battery, improve the initial DCR, improve the rate discharge performance and the high-temperature storage performance, and improve the performance of the lithium ion battery; the problem of poor high-temperature stability of the lithium ion battery in the prior art is solved.

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 an all-vanadium redox flow battery control method and device, a storage medium and electronic equipment. The method comprises the following steps: acquiring actual measurement data of the all-vanadium redox flow battery; performing parameter optimization on a fractional order state-space equation and a fractional order measurement equation constructed based on the all-vanadium redox flow battery according to actual measurement data; based on the fractional order state-space equation, the fractional order measurement equation and the actual measurement data, predicting the charge state and terminal voltage of the all-vanadium redox flow battery at the second moment; and when the deviation between the measured value at the first moment and the predicted value at the second moment is greater than a preset threshold value, adjusting the working current of the all-vanadium redox flow battery according to the measured value at the first moment and the predicted value at the second moment. According to the method, the dependence of the polarization voltage on the historical state and the non-uniform characteristic of ion diffusion are described by means of the fractional order state-space equation, and the charge state and the terminal voltage at the next moment can be predicted more accurately in combination with the actually measured data at the first moment.

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 application discloses a reconfigurable logic unit, a control method and a reconfigurable logic system for implementing complete Boolean logic, and belongs to the technical field of integrated circuit design. The reconfigurable logic unit comprises one P-type MOSFET and four N-type FeFETs. In the four N-FeFETs, two N-FeFETs are connected in parallel, the drain thereof is connected with the drain of the P-MOSFET, and the source thereof is connected in series with the drain of another set of two N-FeFETs connected in parallel. The reconfigurable logic unit takes the gate of the N-FeFET as an input terminal, and can realize logic reconfiguration under the control of the polarization voltage applied to the gate by fully utilizing the polarization characteristics of the ferroelectric device. The reconfigurable logic unit can support the dynamic reconfiguration of 16 complete Boolean logics by only using one P-type MOSFET and four N-type FeFETs, has the advantages of small layout area, low computing power consumption, strong reconfiguration capability, compatibility with CMOS and easy process integration, and the like.

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 application relates to the field of material polarization, and relates to a composite polarization device and a polarization method of a composite piezoelectric material. The device comprises an insulating container, a negative electrode plate, a flexible insulating cover, an insulating liquid and a positive electrode needle. The flexible insulating cover is arranged on the negative electrode plate, the insulating liquid is used for filling in the insulating container, and the positive electrode needle is arranged above an open cavity of the insulating container and used for generating corona to a sample to be polarized. The device combines the advantages of two polarization methods of a direct-current oil bath polarization method and a corona polarization method. The insulating liquid is filled in the insulating container, the small gap between the insulating container and the flexible insulating cover and the complex hollow structure inside the sample to be polarized can be filled, so that the breakdown of any weak point in the polarization process can be prevented. The composite piezoelectric material is polarized by using the composite polarization device, and the polarization voltage can be improved under the condition that the corona discharge is stable and normal.

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 utility model discloses a kind of applied in the stable bootstrap potential circuit in FET operating point circuit, including resistance R1, R2, R3, R4, R5, R6, R7, capacitor C1, C2, C3, C4, C5, C6, C7, C8, diode D1, D2, D3, D4, MOS tube T4 and sound head MK, the diode D1, diode D2, diode D3, diode D4 are in series in turn, diode D4 is away from diode D3 one end and connects polarized voltage, there is C8 between diode D1 and diode D4 and parallel, diode D1 is away from diode D2 one end and capacitor C1 is close to diode D2 one end and parallel and has capacitor C2, resistance R1 is away from diode D1 and connected with resistance R7, resistance R7 is away from resistance R1 one end and connected with sound head MK, this kind of bootstrap potential circuit structure is simple, applicability is strong, can effectively avoid the phenomenon that sensitivity appears bad, improve the practicality of bootstrap potential circuit.

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.