26 results about "Polarization impedance" patented technology

The invention discloses a battery pack equalization control method and system based on multidimensional state mapping, and the method comprises the steps: obtaining terminal voltage data, working current data and surface temperature data of each single battery in a target battery pack; calculating an ohm internal resistance value and a polarization impedance value of each single battery; calculating an impedance growth rate; according to the impedance growth rate and the surface temperature data, a health state value is determined, and an aging weighting coefficient is determined; determining a polarization safety coefficient of each single battery based on the polarization impedance value; calculating a state-of-charge value of each single battery in the target battery pack, and determining a balance demand deviation degree; determining a basic equalization duty ratio of each single battery according to the equalization demand deviation degree; correcting the basic balance duty ratio to generate a target pulse width modulation duty ratio; and according to the target pulse width modulation duty ratio, controlling equalization circuits connected to the two ends of each single battery to be switched on. The battery pack equalization control efficiency is improved.

The invention discloses a load control method and system for mobile energy storage equipment, a medium and a product, and the method comprises the steps: obtaining the motion state data and environment state data of target mobile energy storage equipment; performing second-order differential operation on the real-time speed to obtain a jerk value; generating a power demand impact sequence; based on the real-time polarization impedance and the real-time open-circuit voltage, calculating a maximum pulse discharge power threshold value under the condition that a preset under-voltage protection threshold value is not triggered; when the maximum power demand value in the power demand impact sequence is greater than the maximum pulse discharge power threshold, determining that the target mobile energy storage equipment has a power supply drop risk in a preset load prediction time window; calculating an energy gap prediction sequence based on waveform integration of the power demand impact sequence; and generating a feed-forward compensation instruction based on the energy gap prediction sequence, and controlling an auxiliary power conversion unit in the target mobile energy storage equipment to execute the feed-forward compensation instruction. And the accuracy of load control is improved.

According to the valve-regulated lead-acid storage battery state-of-health assessment method and system provided by the invention, the characteristic frequency points which are not sensitive to the change of the charge state but sensitive to the aging degree in the relaxation time distribution map of the battery are innovatively screened, and the multi-parameter fusion assessment model based on the polarization impedance, the ohmic internal resistance and the residual capacity is established; the defect that a single capacity index cannot reflect a historical aging path of the battery is overcome, the future attenuation trend of the battery can be predicted while the current health state is accurately quantified, the influence of charge state fluctuation on health assessment is effectively avoided based on a dual-stability screening mechanism of a characteristic frequency point, the assessment reliability under a complex working condition is improved, and the assessment accuracy is improved. The full-band impedance test is simplified into specific target frequency point measurement, so that the detection time is greatly shortened, and the on-site rapid evaluation requirement is met.

This invention relates to a medium-temperature solid oxide fuel cell cathode material and its preparation method. The invention employs a sol-gel method to synthesize perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The material contains PrBaCo2O with a double perovskite structure. 5+δ BaCo with single perovskite structure 0.8 Zr 0.1 Y 0.1 O 3‑δ Two phases. Multiphase Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The sample achieved a conductivity of 100 S / cm within the operating temperature range of a mid-temperature solid oxide fuel cell. ‑1 At 700℃, the polarization impedance is 0.06 Ωcm. 2 This meets the requirements for cathode materials in solid oxide fuel cells. The electrolyte-supported single cell achieved a maximum power density of 710 mW / cm³ at 800℃. ‑2 The single cell underwent continuous and stable discharge at a constant current for 200 hours without performance degradation, demonstrating excellent output performance stability. In summary, perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ It is a potential cathode material for intermediate-temperature solid oxide fuel cells.

The invention discloses an application of a sea urchin-shaped spinel electrode material in a solid oxide fuel cell (SOFC), and the SOFC oxygen electrode material is sea urchin-shaped NiCo2O4 spinel and is prepared by a hydrothermal method. The sea-urchin-shaped spinel is self-assembled to the surface of the YSZ electrolyte through a current polarization induction method, the sea-urchin-shaped spinel electrode can maintain a good nano structure and a high specific surface area without a high-temperature sintering process, an SOFC based on the sea-urchin-shaped spinel oxygen electrode obtains excellent electrochemical performance, and at the working temperature of 700 DEG C, the electrochemical performance of the SOFC is greatly improved. The maximum output power can reach 2.06 W / cm < 2 >, the ohmic impedance is 0.053 ohm cm < 2 >, the polarization impedance is 0.077 ohm cm < 2 >, and excellent long-term stability is shown.

The application relates to the field of power supply circuits and electric energy storage systems, and discloses a full-life-cycle adaptive optimization scheduling method for an energy storage system of a micro-grid cluster, which comprises the following steps: acquiring polarization impedance data of each energy storage branch representing electrode interface charge transfer resistance and an operating state, and decomposing bus net load power into a transient high-frequency sequence and a steady-state low-frequency sequence; distributing high-frequency fluctuation according to the reciprocal of the polarization impedance, adjusting the virtual impedance gain of a power conversion unit control loop to make the output current change rate lower than the physical boundary of ion diffusion rate; and introducing carbon emission intensity weight and loss cost function to correct the power limit value. The application establishes the physical correlation between the battery kinetics and the power fluctuation frequency, smoothes the current waveform by using the virtual impedance adjustment technology, suppresses the concentration polarization and lithium precipitation phenomenon of the electrode interface, and essentially prolongs the service life of the energy storage system.

This invention provides a one-dimensional surface-shared oxide air electrode material, its preparation method, and its application, belonging to the technical field of air electrode materials. The novel one-dimensional surface-shared oxide air electrode material provided by this invention, which is non-stoichiometric, is A5B5O. 14 Type oxide, with the chemical formula Ba 5‑x Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ Where 0 ≤ x ≤ 0.8. This invention modulates the oxygen vacancy concentration by changing the stoichiometric ratio of Ba at the A-site of the oxide, thereby improving its electrochemical performance in proton-conducting ceramic batteries. In Example 3 of this invention, Ba with x = 0.5... 4.5 Co 2.85 Fe 1.9 Ni 0.25 O 14‑δ When applied to proton-conducting ceramic batteries, it exhibits the highest measured electrochemical performance; at 700℃, in fuel cell mode, the measured polarization impedance is only 0.041 Ω·cm. 2 Its maximum power density reaches 2.101 W·cm³. ‑2 In electrolytic cell mode, after introducing humid air to the air electrode side, the current density reached 5.080 A·cm⁻¹ at an electrolytic voltage of 1.3V. ‑2 .

The invention belongs to the technical field of electrochemical materials, and particularly relates to an anti-Cr poisoning composite current collecting layer for a solid oxide fuel cell as well as a preparation method and application of the anti-Cr poisoning composite current collecting layer. The Cr poisoning resistant composite current collecting layer is a composite current collecting layer constructed by adopting two perovskite materials LCN and LSCN, and the problem of cathode failure caused by volatilization of metal connector Cr is successfully solved by combining the physical barrier characteristic of strontium-free LCN and the chemical capture characteristic of strontium-containing LSCN. The invention aims at an SOFC system using an iron-based alloy as a connector, and aims at solving the technical problem that the catalytic activity of a cathode is attenuated due to chromium species volatilized by a metal connector in a high-temperature oxygen-enriched environment, so that the long-term operation stability of a cell stack is remarkably improved, and the service life of the cell stack is remarkably prolonged. According to the invention, through specific material combination and layered structure design, the contradiction that a single current collecting layer is difficult to give consideration to Cr volatilization blocking and low contact resistance maintaining is solved, and the polarization impedance growth rate of the cell is significantly reduced.

The present application relates to the technical field of sodium-ion battery health management, in particular to a sodium-ion battery SOC estimation method and system for a DC screen. First, the ohmic impedance and polarization impedance of each battery are obtained, and the reference ohmic impedance and reference polarization impedance are extracted. Further, the capacity loss index is obtained according to the difference between the ohmic impedance of each battery and the reference ohmic impedance, combined with the difference between the polarization impedance and the reference polarization impedance. Further, the historical minimum polarization reference of the battery pack is maintained, and the correction loss value is obtained according to the difference between the current reference polarization impedance and the historical minimum polarization reference, combined with the capacity loss index. Further, the correction loss value is converted into a single battery charge loss amount. Finally, based on the single battery charge loss amount, the system effective SOC of the battery pack is determined according to the series short board effect of the battery pack, and reliable basis is provided for operation and maintenance personnel.

The invention discloses a low-impedance porous support type SOFC (Solid Oxide Fuel Cell) electric pile and a preparation method thereof, and belongs to the technical field of solid oxide fuel cells. The electric pile comprises an anode porous supporting body, an electrode active layer, an electrolyte layer and an interconnection material, and by adopting a porous supporting electrode structure and combining a directional micro-channel design, the ohmic impedance is remarkably reduced by 30%-40%, and the polarization impedance is remarkably reduced by 20%-30%. An electrode and electrolyte interface is optimized by adopting the combination of processes such as an impregnation method, plasma spraying and co-sintering, and the interface resistance is reduced by 25-30% by introducing the gadolinium-doped cerium oxide transition layer, so that the electrochemical performance and long-term operation stability of a galvanic pile are improved. Under the operation condition of 700-800 DEG C, the output power density of the electric pile reaches 1.5 W / cm < 2 >-2.0 W / cm < 2 > which is improved by 30%-50% compared with that of a traditional electric pile, and the thermal cycling stability and the long-term operation stability are also remarkably improved.

The application belongs to the technical field of lithium battery materials, and specifically discloses a kind of porous carbon negative electrode material for lithium ion battery and its preparation method. First, a copolymer is prepared by stage polymerization of functional monomers and chain transfer agent; second, a core-shell template is formed by ball milling and calcination using nano-molybdenum trioxide and zinc acetate dihydrate as raw materials; then, the copolymer, core-shell template, sodium chloride and polymethyl methacrylate microspheres are mixed and sieved to obtain a precursor; finally, the precursor is subjected to multi-stage temperature carbonization and post-processing to obtain a porous carbon negative electrode material. The obtained negative electrode material has a hierarchical porous structure and a high specific surface area, and realizes the synergistic doping of multiple elements such as nitrogen, phosphorus and molybdenum, effectively promoting the rapid transmission and efficient storage of lithium ions, significantly improving the rate performance and cycle stability of the battery, reducing the polarization impedance, and further optimizing the electronic conductivity and interface stability of the material, which exhibits excellent comprehensive electrochemical performance in high-energy-density lithium ion battery applications.

The invention provides a high-entropy perovskite-based composite electrode material, a preparation method of the high-entropy perovskite-based composite electrode material, electrode slurry, an electrode and a solid oxide battery. The chemical formula of the high-entropy perovskite-based composite electrode material is (A < 1-x > Ce < x >) < y > BO < 3-delta >, a is selected from a combination of four or more than five of alkaline earth metal elements and rare earth elements, and A is not Ce; b is selected from one or a combination of more than two of transition metal elements; 0 < x < = 1, 0.5 < = y < 1, and delta is oxygen vacancy content. The high-entropy perovskite-based composite electrode material disclosed by the invention has excellent catalytic activity, shows excellent stability in an air atmosphere and in a severe actual working environment of a battery containing water, Cr and the like, and has relatively low polarization impedance.

This invention relates to the field of intelligent monitoring technology, specifically a monitoring and intervention system based on wearable electromyography (EMG) sensing. The system includes: an impedance compensation acquisition module that applies a variable capacitance bias voltage to acquire discrete EMG parameters; a trajectory vector reconstruction module that generates a coordinate matrix and calculates the cosine of the tangent angle; a spasm identification and judgment module that calculates the output signal when the dispersion exceeds the limit; a residual tension mapping module that generates an attenuation slope based on the over-limit parameters; and a stimulation waveform modulation module that generates an intervention waveform in combination with a safety benchmark. In this invention, high-fidelity discrete signals are acquired by dynamically compensating for the polarization impedance fluctuations of the skin contact surface, mapping the one-dimensional potential of the time sequence to a multi-dimensional phase space and calculating the tangent vector dispersion, accurately capturing the nonlinear abnormal variation characteristics hidden in muscle spasms, dynamically converting the attenuation rate based on the tension difference and setting a safety limit benchmark in combination with the joint range of motion, outputting an intervention waveform adapted to the current tension level, and providing truncation protection when the limit is exceeded.

The application belongs to the technical field of new materials, and discloses a porous electrode material, an electrode and a preparation method thereof and a solid oxide electrolysis cell. 1.5 Mo 0.5‑x W x O6- δ wherein x represents a molar fraction, and the value range of x is 0 1.5 Mo 0.5 O6 perovskite material, a W-doped Mo is used to replace part of Mo, and a porous electrode material is designed by using the higher valence and electronegativity of W relative to Fe and Mo, and the smaller ionic radius of W relative to Mo. The electrode material not only has high CO2 adsorption, but also has high temperature stability and high catalytic activity. When the electrode material is applied to the oxide solid electrolysis cell, the current density of SOEC electrolysis CO2 is effectively improved, and the polarization resistance of the material is reduced.

The invention relates to the technical field of energy optimization scheduling, and particularly provides a wind, light and heat storage multi-energy system optimization scheduling method based on self-adaptive dynamic programming. The core of the method is to reversely utilize the'heat conduction lag-morphological difference 'coupling effect of rotor thermal stress: firstly, completing thermal risk trend quantification by morphological deviation of node virtual temperature and a reference sequence; a risk adjustment coefficient, battery polarization impedance and a charge constraint term are extracted under a power adjustment working condition, and a battery suppression weight is calculated by means of normalization and feature fusion; the system automatically distributes scheduling instructions to batteries and photo-thermal power stations by embedding dynamic weights into a quadratic programming objective function. According to the method, radial temperature field deduction-thermal expansion stress prediction-form deviation quantification is taken as a judgment basis, a blind area of a single-point threshold value to heat conduction lag is eliminated, the precision and response speed under second-level rolling optimization are ensured, and collaborative optimization of rotor thermal shock suppression, battery aging delay and unit climbing cost is realized.

The invention provides a battery pack capacity dynamic calibration method and system based on multi-time scale model coupling. The method comprises the following steps: collecting data in real time in the charging and discharging process of a battery pack, and identifying the real-time polarization impedance of each single battery on line by using a second-order RC equivalent circuit model; constructing an impedance-capacity coupling model containing a linear attenuation item and an exponential attenuation item taking polarization impedance as an independent variable, and estimating the current maximum available capacity of the single body; the maximum capacity and the impedance voltage drop are comprehensively considered, and the residual discharge time is predicted to lock the short-plate battery; and calculating an inflection point compensation amount according to the impedance change rate of the short-plate battery, and deducting the compensation amount from the theoretical residual capacity of the battery pack to obtain a calibrated actual available capacity. The method can solve the technical problems that the nonlinear capacity diving phenomenon in the later stage of battery aging is difficult to predict in the prior art, and the battery pack is virtually high in electric quantity and suddenly shut down due to the short plate effect caused by single impedance deterioration cannot be effectively handled.

According to the stepped cathode and the preparation method thereof, the thickness of a cathode layer and the LSCF proportion are gradually reduced from an air inlet to an air outlet, the LSCF proportion is gradually reduced from the cathode to an electrolyte, the thickness and the composition content are distributed in a stepped mode, and the stepped cathode is at least divided into three uniform areas. The thickness and the material composition of the cathode are regulated and controlled at different positions, so that the electrode polarization impedance is effectively reduced, the uniformity and the three-phase boundary density of oxygen reduction reaction are improved, and the air utilization rate and the electrochemical performance are further improved. According to the invention, high output power and uniform reaction distribution of the solid oxide fuel cell are realized, and the method is suitable for large-scale preparation of high-performance fuel cells.

The application discloses a mechanical and electrical installation task topology analysis and intelligent scheduling method based on BIM digital twinning, relates to the technical field of mechanical and electrical installation scheduling, and comprises the following steps: pre-compiling the component sweep interference into a static anti-collision constraint directed graph containing impedance edge weight; when optical anomalies occur, performing one-way denial visual release of the work machine bottom layer to determine the deadlock abnormal node; extracting a local wave and subgraph around the deadlock abnormal node and generating a replacement flow transfer instruction sequence; updating the graph edge impedance according to the execution delay, and outputting the machine posture micro-shake cumulative offset tensor and the safety envelope approximation limit alarm mark when the continuous micro-shake erosion remaining clearance distance is output; and according to the tensor, performing virtual anti-collision envelope expansion and writing back the polarization impedance weight. The method reduces the edge end three-dimensional anti-collision calculation burden, improves the determination reliability in a strong light dust scene, and realizes the early diversion and anti-collision control under the condition of continuous micro-shake.

The present application relates to power battery management technical field, specifically to a kind of power battery package initiative equalization intelligent control method and system, comprising: synchronously collecting the real-time terminal voltage of each single cell in power battery package, charge-discharge bus current, cell surface temperature and sampling time stamp, obtain basic operation data;Through time-frequency domain calculation, extract polarization impedance, calculate transient polarization voltage, and deduct ohmic voltage drop and transient polarization voltage from real-time terminal voltage, to obtain actual open-circuit voltage data;Calculate the actual open-circuit voltage difference of single cell, combine system delay parameter and virtual impedance parameter to carry out pressure difference prediction and duty ratio adjustment, generate target control scheme;According to temperature state and health state, calculate dynamic equalization pressure difference threshold;According to target control scheme and threshold, drive equalization circuit to execute initiative equalization, and complete closed-loop control based on feedback data;The present application can reduce dynamic load under error equalization and equalization current oscillation.

This invention relates to the field of performance testing technology for oil additives, and particularly to a method for detecting and analyzing the effect of a hybrid gasoline additive. The method includes: conducting benchmark performance tests on the additive-treated gasoline and establishing an initial digital fingerprint; placing the additive-treated gasoline (as the experimental group) and the base gasoline (as the control group) into a multi-field coupled aging device for aging; during the aging process, circulating the oil sample through a microfluidic detection cell connected in series with a quartz crystal microbalance and interdigitated electrodes, and applying ultraviolet pulsed light; acquiring the resonant frequency-dissipation factor spectrum and the interface polarization impedance spectrum, and determining the additive's mechanism of action based on the recovery time constant and decay mode; after aging, acquiring molecular spectra and comparing them with the initial digital fingerprint to obtain spectral deviation; determining the additive's effectiveness based at least on the spectral deviation, selecting an aging model for effective additives according to their mechanism of action, extrapolating the spectral data to calculate the equivalent natural storage life, and outputting the residual protective life.

The application relates to the technical field of storage batteries, in particular to a data center storage battery health degree prediction and maintenance method, which comprises the following steps: in response to a load current step feature, calculating an ohmic impedance characteristic value and a polarization impedance characteristic value; preferentially comparing the ohmic impedance characteristic value with a preset physical fault threshold value, if the ohmic impedance characteristic value exceeds the preset physical fault threshold value, locking a physical connection fault and terminating subsequent determination, if the ohmic impedance characteristic value does not exceed the preset physical fault threshold value, analyzing the polarization impedance characteristic value, if a time series dispersion degree of the polarization impedance characteristic value exceeds a preset stability threshold value, marking an electrochemical instability state, calculating a difference value between a battery surface temperature rise rate and an environmental temperature rise rate, if the difference value is greater than a preset endogenous heat production threshold value and a current battery surface temperature is less than a preset overheating alarm threshold value, locking a thermal runaway incubation period; according to the locking result, respectively executing a mechanical maintenance operation or a loop blocking intervention operation. The application can strip the masked polarization feature through time domain decoupling, and realizes early and accurate early warning of the thermal runaway incubation period.

The invention provides a method and device for determining a lithium intercalation quantity-OCV curve, a terminal and a storage medium. The method comprises the following steps: establishing a three-order RC equivalent circuit model of a battery; obtaining an SOC-OCV curve of the battery based on the three-order RC equivalent circuit model; obtaining the theoretical gram volume and the actual gram volume of the battery; and according to the SOC-OCV curve and the difference between the theoretical gram volume and the actual gram volume, determining a relation curve between the lithium intercalation amount of the electrode material of the battery and the open-circuit voltage OCV of the battery. The voltage response characteristics of the battery in the charging and discharging process can be better captured through the three-order RC equivalent circuit model, the influence of the polarization impedance of the battery on the performance of the battery is considered, the state information of the battery can be timely and accurately reflected, and the relation curve between the lithium intercalation amount passing through the electrode material and the OCV is more accurate.

This invention discloses a synchronous detection device for arrayed permanent magnet and electrochemical impedance spectroscopy (EIS) of steel reinforcement corrosion in concrete, belonging to the field of electronic digital data processing technology. It is suitable for non-destructive testing of concrete structure corrosion in structural health assessment. The device includes at least one sub-detection mechanism. Each sub-detection mechanism comprises a unit frame and, from front to back, a permanent magnet probe, a main wheel, an electrical control box, and wheel-type electrodes arranged sequentially on the unit frame. The permanent magnet probe consists of a permanent magnet and a magnetic coil; the wheel-type electrodes consist of a transmitting electrode and a receiving electrode. The electrical control box is communicatively connected to both the permanent magnet probe and the wheel-type electrodes, and consists of an analog wireless acquisition module, an AC impedance analyzer, and electrode control valves. This device uses a permanent magnet perturbation method to identify the spatial distribution of corrosion state, and then combines this with the dynamic feature extraction of the AC polarization impedance method to quantitatively calculate the corrosion current and corrosion rate. The combination of these two methods allows for the synchronous acquisition and integrated assessment of the amount and rate of steel reinforcement corrosion without damaging the concrete structure. This invention also discloses a method for synchronous detection of arrayed permanent magnet and electrochemical impedance spectroscopy (EIS) of steel reinforcement corrosion in concrete.

This invention provides a nano-copper composite negative electrode conductive agent and a method for preparing carbon-coated nano-copper. The conductive agent comprises 40-50% carbon-coated nano-copper particles, 20-30% conductive carbon black, 10-15% carboxylated carbon nanotubes, and binders and dispersants. The key to its preparation lies in the in-situ growth of nano-copper particles with a 2-5 nm amorphous carbon coating layer via a hydrothermal-calcination method, solving the problem of copper oxidation and dissolution in the battery environment. Subsequently, the nano-copper, conductive carbon black, and carbon nanotubes are compositely dispersed with each other under inert gas protection through ball milling and ultrasonic processes to form a three-dimensional synergistic conductive network. When applied to the negative electrode of a lithium-ion battery, this conductive agent can construct an efficient electron transport path, significantly reduce polarization resistance, and improve the battery's fast-charging performance (6C charging for 10 minutes, SOC > 80%), cycle life (capacity retention > 80% after 2000 cycles), and structural stability, while also exhibiting good processability and safety.

The invention belongs to the technical field of fuel electrode preparation, and particularly relates to a method for promoting in-situ dissolution of a double-phase surface of a perovskite and fluorite structure composite material. Comprising the following steps: preparing composite fuel electrode material SCFM / GDC powder according to the chemical formula of the composite fuel electrode material Sr < 2 > Co < x > Fe < 1.6-x > Mo < 0.4 > O < 6-delta > / Gd < 0.1 > Ce < 0.9 > O < 2-delta >; preparing a GDCSSZGDC electrolyte framework; the method comprises the following steps: forming electrode slurry by SCFM / GDC, symmetrically coating two sides of an electrolyte skeleton with the electrode slurry, calcining to obtain a calcined product, carrying out acid treatment, and then carrying out reduction treatment, so that the CoFe bimetallic alloy nanoparticles on the SCFM and GDC dual-phase surfaces are dissolved in situ. According to the invention, an acid treatment method is adopted to promote in-situ dissolution of double-phase surface bimetallic alloy particles, so that the SOCs fuel electrode with large catalytic activity area, high electrochemical performance and low polarization impedance is obtained.

This invention provides a method, system, and machine-readable storage medium for determining polarization impedance, belonging to the field of energy storage analysis. The method includes: determining a relaxation time distribution function with resistance-capacitance impedance and resistance-inductance impedance as variables based on the electrochemical AC impedance spectrum of the target energy storage device under a set excitation; further determining a fitted relaxation time distribution characteristic curve of the resistance-inductance impedance; and determining the impedance of each polarization inductance corresponding to each peak based on the number of peaks in the fitted relaxation time distribution characteristic curve and the area below the peak curve corresponding to each peak. This invention's method enables polarization characteristic analysis of the measured electrochemical AC impedance spectrum without preprocessing the energy storage device using an equivalent circuit model, effectively reducing data processing workload. Furthermore, this method expands the application scope of electrochemical AC impedance spectroscopy.