119 results about "Cell impedance" patented technology

The invention discloses a secondary battery, and belongs to the technical field of batteries, according to the secondary battery, cyclic sulfate is introduced into an electrolyte, and meanwhile, the content of the cyclic sulfate in the electrolyte, the nuclear magnetic displacement value of central carbon atoms of the electrolyte and the passivation capability of a negative pole piece are cooperatively regulated and controlled, so that the first-effect performance of the secondary battery can be effectively improved; and meanwhile, the low level of battery impedance can also be considered.

The invention provides an SOC estimation method and device for a lithium battery, electronic equipment and a storage medium, and belongs to the technical field of battery management, and the method comprises the steps: obtaining a current model parameter of a pre-constructed battery equivalent circuit model and an SOC estimation value at a previous moment; predicting the terminal voltage of the lithium battery at the current moment based on the current model parameter, the current of the lithium battery at the current moment and the SOC estimated value at the previous moment; and estimating the SOC at the current moment based on the SOC estimated value at the previous moment by adopting an SOC estimation algorithm, and correcting the SOC estimated at the current moment based on the deviation between the predicted terminal voltage and the terminal voltage actually measured at the current moment to obtain the optimal SOC estimated value at the current moment. According to the method, the dynamically updated battery equivalent circuit model parameters are introduced, so that the model can reflect the change of the impedance characteristic of the battery in real time, the terminal voltage prediction error is remarkably reduced, and the SOC estimation precision is improved.

The invention discloses an energy storage battery aging evaluation method and device under an immersed liquid cooling condition, terminal equipment and a storage medium, and belongs to the field of battery testing. The method comprises the steps of obtaining a first active lithium ion loss change rate and a first active substance loss change rate according to a battery voltage and a first battery capacity identification characteristic peak in a to-be-tested battery test, and calculating a battery capacity loss change rate according to a first battery capacity and a second battery capacity before the test; determining a second active lithium ion loss change rate, a second active material loss change rate and a battery impedance change rate based on the electrochemical impedance spectrogram and the pre-test impedance, and determining the battery capacity loss change rate and the battery impedance change rate according to the determined active lithium ion loss, the active material loss, the battery capacity loss change rate and the battery impedance change rate. The resistance, the moisture content and the dielectric loss change rate of the cooling liquid to be measured construct an analytic hierarchy model, the battery aging condition is determined according to the calculated aging evaluation value, and the problem that deviation exists in single evaluation in the prior art is solved.

A battery state diagnosis apparatus includes a processor configured to extract battery impedance by obtaining voltage and current signals outputted from a battery management system of an electric vehicle, removing noise by performing first signal processing on the voltage and current signals outputted from the battery management system, and extracting a frequency characteristic by performing second signal processing on the voltage and current signals from which the noise has been removed, and a storage configured to store data and algorithms driven by the processor.

The invention discloses a lithium ion pool charge state detection method and system based on an electrochemical impedance spectroscopy, by obtaining impedance spectroscopy measurement data in a full charge state range, the data integrity of model construction is ensured, a foundation is laid for later model construction, a fractional order equivalent circuit model is adopted to fit impedance spectroscopy data, and the lithium ion pool charge state detection method and system based on the electrochemical impedance spectroscopy are obtained. According to the method, the actual electrochemical behavior of the battery can be described more accurately, the defects of a traditional integer order model during fitting of a non-ideal semicircular structure are overcome, the parameter identification precision is improved, SEI film resistance RSEI and a battery impedance value are screened out to serve as characteristic parameters to construct a battery SOC estimation model, the state estimation reliability is improved, and the reliability of the state estimation is improved. According to the method, the SOC of the to-be-detected battery is estimated based on the battery SOC estimation model, lossless, rapid and online detection of the battery is realized, and the method disclosed by the invention does not need complex iterative calculation or large-current pulse test and is high in parameter identification precision.

The invention relates to a battery and an electric device, and belongs to the technical field of batteries. The cyclic sulfate and the lithium difluorophosphate are added into the electrolyte, and the mass ratio m of the lithium difluorophosphate to the cyclic sulfate in the electrolyte, the liquid retention coefficient n of the battery cell and the absolute value of the difference value of the particle sizes Dv50 of the positive electrode and the negative electrode are controlled to meet the specific relationship, so that the lithium difluorophosphate can be ensured to participate in film formation well in the initial stage and the later stage of circulation; the side reaction between the electrolyte and the positive and negative pole pieces in the long-cycle process is inhibited, and the cycle stability of the battery is ensured; meanwhile, the transmission performance of lithium ions at the positive electrode and the negative electrode is improved, the battery impedance is reduced, the cycle performance and the fast charge performance are cooperatively improved, and the battery has excellent and balanced cycle and fast charge characteristics.

This application discloses a portable online electrochemical impedance spectroscopy measurement system and method for lithium-ion batteries, relating to the field of lithium-ion battery technology. The system includes: a power supply system for powering a power transmission system and an online measurement system, connected in parallel with a charger connected to the battery pack to achieve synchronous charging and impedance measurement; a power transmission system for converting direct current into a step function current, which is superimposed on the DC charging current and injected into the battery pack as an excitation signal; a control system for adjusting the frequency of the step function current using pulse width modulation technology; a measurement circuit module for acquiring the current and voltage signals of the battery pack; and a data analysis module for processing the time-domain signal using wavelet transform to calculate the electrochemical impedance spectrum. This application achieves low-cost, portable online measurement, enabling monitoring of the battery impedance spectrum during charging and providing support for safety early warning.

In order to solve the technical problem that battery impedance is increased due to the fact that a high-temperature performance additive is added into an existing lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium battery, the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a first additive and a second additive, the first additive comprises at least one of compounds shown in a structural formula 1: A-D-B-E-C structural formula 1; the second additive comprises at least one of compounds shown in a structural formula 2: the non-aqueous electrolyte with the structural formula 2 meets the following relational expressions: 0.15 < b / (a + b) < 0.65, 0.1% < = a < = 3%, and 0.1% < = b < = 1%. According to the non-aqueous electrolyte provided by the invention, the high-temperature cycle capacity retention rate and the high-temperature storage performance of the battery can be improved, impedance increase in the high-temperature cycle and high-temperature storage processes is effectively inhibited, gas production is reduced, and the high-temperature performance of the electrolyte is remarkably improved.

This invention relates to a method for predicting the internal temperature of a battery based on variable frequency impedance measurement, belonging to the field of battery thermal management technology. The invention measures the impedance of the battery in its offline state at different temperatures and at different excitation frequencies, plots the battery excitation frequency-impedance relationship at different temperatures, divides temperature ranges according to the test accuracy, finds the optimal excitation frequency for each temperature range, and fits the battery impedance-temperature function relationship at the optimal excitation frequency for each temperature range. Using the one-dimensional heat transfer principle, the measured battery surface temperature and ambient temperature are used as inputs to perform the first estimation of the battery's internal temperature, obtaining the internal temperature T. in 1; Based on the internal temperature T in 1. Select the optimal excitation frequency for the corresponding temperature range, i.e., the internal temperature T. in The optimal excitation frequency for the specified temperature range is used to perform a second estimation based on the battery impedance-temperature function relationship at the optimal excitation frequency, thus obtaining the battery internal temperature T. in 2. This invention can more accurately predict the internal temperature of a battery.

An impedance calculation apparatus applicable to a power source system provided with a storage battery, applying an AC signal to the storage battery to calculate an impedance of the storage battery, during a predetermined impedance calculation period, the impedance calculation apparatus includes: an error calculation unit that applies the AC signal having a specified frequency at which at least either a real part component or an imaginary part component of an impedance of the storage battery is a specific value, to calculate an impedance error of the storage battery, during an error calculation period different from the impedance calculation period; an impedance calculation unit that calculates an impedance of the storage battery during the impedance calculation period; and a correction unit that corrects, based on the impedance error, the impedance of the storage battery calculated by the impedance calculation unit.

This application provides a battery impedance analysis method, apparatus, storage medium, and computer equipment. When analyzing battery impedance, an EIS test is performed on the target battery to capture various electrochemical behaviors of the battery during the test process through the dynamic characteristics in the test data. Therefore, the DRT spectrum generated by DRT analysis of the test data can intuitively display the impedance response time corresponding to different electrochemical processes in the time dimension. After determining the response range of each electrochemical process, standard charge-discharge cycles can be performed on the target battery. During the cycle, DCR tests are performed on the target battery for multiple selected cycles, and impedance decomposition is performed on the obtained DCR data based on each response range to achieve real-time subdivision of the overall impedance information. Finally, the impedance decomposition data obtained after subdivision for each selected cycle number are compared and analyzed to generate high-quality impedance analysis results.

The application discloses an integrated electrode and a preparation method and application thereof, wherein the preparation method comprises the following steps: uniformly mixing a positive electrode active material, LiOH and a metal conductive agent, and then press-forming into a sheet to obtain a positive electrode sheet; uniformly mixing one or more of oxide solid electrolytes and LiOH, and then press-forming into a sheet to obtain an electrolyte sheet; uniformly mixing a negative electrode active material and a metal conductive agent, and then press-forming into a product to obtain a negative electrode sheet; sequentially stacking the positive electrode sheet, the electrolyte sheet and the negative electrode sheet, and then performing cold isostatic pressing treatment to obtain a mixed stack; and performing sintering treatment on the mixed stack in an oxygen atmosphere to obtain the integrated electrode. The integrated electrode prepared by the application greatly eliminates the interface problems existing in traditional oxide battery materials and the influence of glue in the electrode on the impedance of the battery, and the integrated electrode has high compactness and higher energy density; and the integrated electrode is used for preparing a solid battery, so that the rate and cycle performance of the battery can be effectively improved.

The invention relates to a high-throughput cell electric signal exporting device based on an analog switch, a cell impedance detection system and a detection method, and belongs to the technical field of biomedical detection equipment. The system achieves the functions of image observation and cell electric signal export at the same time, and is characterized in that a more complex circuit layout is achieved by using a smaller PCB size. According to the system, by integrating temperature control and electric signal conduction, the function of an existing microscope is utilized, electric signal conduction is completed, and a brand new technical scheme is provided for biological experiments such as analysis of the growth state, the adhesion degree and the migration ability of cells.

This invention relates to the field of battery technology, specifically to a composite negative electrode current collector, its preparation method, and its application. The composite negative electrode current collector of this invention includes a polymer material layer, a lithium replenishment layer, and a conductive metal layer. The lithium replenishment layer is located on at least one surface of the polymer material layer, and the conductive metal layer is located on the surface of the lithium replenishment layer away from the polymer material layer. The lithium replenishment layer includes a composite lithium material comprising a lithium metal core and a lithium compound coating layer covering the surface of the lithium metal core. The conductive metal layer has multiple through-hole structures. The composite negative electrode current collector of this invention, through the coordination of its various layer structures, is beneficial for improving the storage performance of the negative electrode, reducing battery impedance, shortening the electrolyte wetting time, enhancing lithium replenishment capacity, preventing the formation of lithium dendrites, and improving battery safety performance.

The application discloses an excitation current generating circuit and a control method for battery impedance spectrum measurement, and belongs to the field of battery impedance spectrum detection. The excitation current generating circuit generates an excitation current with a set frequency and amplitude on the connected battery system to perform battery impedance spectrum measurement. The excitation current generating circuit is connected in parallel with the battery system, an energy storage converter or a load. A mathematical model, an equivalent circuit model and a control method of the excitation current generating circuit are provided. Through closed-loop control of the port current of the excitation current generating circuit and the DC side capacitor voltage, the excitation current with controllable frequency and amplitude is generated by periodic energy exchange with the battery system. Compared with the prior art, the excitation current generating circuit provided by the application does not need to make any adjustment to the existing equipment in the energy storage system, adopts a battery system self-energy supply mode, and generates an excitation current for impedance spectrum measurement under low power consumption.

The invention provides an intelligent battery management system and method for electric vehicle charging, and relates to the technical field of intelligent battery management, working condition parameters of a target electric vehicle battery are collected, and battery impedance multi-mode sensing is performed on the target electric vehicle battery according to the working condition parameters to obtain a multi-source heterogeneous parameter set; acquiring historical charging data, performing inferior electricity prediction on the target electric vehicle battery according to the multi-source heterogeneous parameter set and the historical charging data to obtain a battery class loss set, and determining an inferior loss response according to the battery class loss set; determining an inferior electricity index through the inferior damage response, and performing intelligent charging management on the target electric vehicle battery according to the inferior electricity index and a preset charging strategy to obtain a charging strategy; and the target electric vehicle battery is intelligently charged according to the charging strategy, and intelligent charging strategy management is completed. According to the invention, the deterioration state of the rechargeable battery of the automobile can be accurately identified, and the charging safety and efficiency are improved.

The present application belongs to the technical field of fuel cell, and particularly relates to a kind of fuel cell impedance spectrum fast measurement system and measurement method, system is divided into excitation current injection part, data acquisition part and host computer, host computer uses DIBS signal with excellent peak suppression ability and flexible amplitude frequency design ability as test excitation, uses electronic load as excitation source.Host computer can control electronic load to generate current excitation waveform for impedance test based on DIBS signal, and electronic load injects excitation current into the output current of the measured stack, and host computer can also read the sampling data of data acquisition part, and the collected excitation current and response voltage data are subjected to fast Fourier transform to obtain electrochemical impedance spectrum.The present application improves the impedance measurement efficiency, the hardware structure is simple, has good on-site application prospect, and the measured object can be extended to other electrochemical systems including electrolytic cell, and has good expandability.

The purpose of the present invention is to evaluate a battery with high accuracy using a simple method. A control unit (12) executes each of operation in a first mode in which the operation of a first switch (SW1) corresponding to a first resonance circuit (Rs1) and the operation of a second switch (SW2) corresponding to a second resonance circuit (Rs2) are different, and operation in a second mode. The control unit (12) determines the internal impedance of a battery (10) on the basis of the damped oscillation waveform of the first resonance circuit (Rs1) when operating in the first mode, the damped oscillation waveform of the first resonance circuit (Rs1) when operating in the second mode, and the damped oscillation waveform of the second resonance circuit (Rs2) when operating in the second mode.

The present invention provides a cell impedance measurement device capable of measuring and collecting electrical data on cells and performing real-time cell analysis in a non-destructive manner, and a cell analysis system comprising same.

Provided is a power storage system, a secondary battery control system, a secondary battery measurement circuit, or the like that consumes low power. Provided is a power storage system, a secondary battery control system, a secondary battery measurement circuit, or the like that is highly integrated. The power storage system includes a secondary battery and a measurement circuit; the measurement circuit includes a resistor, a capacitor, and an inductor; one terminal of the resistor is electrically connected to one electrode of the capacitor; the other terminal of the resistor is electrically connected to one terminal of the inductor; one terminal of the inductor is electrically connected to a positive electrode of the secondary battery; and the measurement circuit has a function of measuring impedance of the secondary battery by measuring current of the resistor.

A battery impedance detection apparatus is provided, and the apparatus includes: a first processing module (501), configured to: perform first code transformation on a first signal based on a preset code, to obtain an excitation signal, and apply the excitation signal to a battery, where the first signal is an original signal used to generate the excitation signal; a sampler (502), coupled to the battery, and configured to sample a voltage of the battery after the excitation signal is applied to the battery, to obtain a sampled voltage signal; and a second processing module (503), configured to: perform second code transformation on the sampled voltage signal based on the preset code, to obtain a first voltage signal; perform the second code transformation on a current signal of the battery based on the preset code, to obtain a first current signal; and determine, based on the first voltage signal and the first current signal, impedance corresponding to the battery. According to the foregoing method, EIS detection can be implemented when the battery is in a charging state or the battery is in a load discharging state.

To suppress a decrease in SOC of a secondary battery while suppressing a decrease in reliability of a measurement value of impedance due to a random error, in an impedance measurement device of the secondary battery.SOLUTION: An impedance measuring device (10) measures an impedance of a secondary battery (41,42) on the basis of a measurement value of an alternating current flowing from the secondary battery and a measurement value of a voltage fluctuation between terminals of the secondary battery in response to the alternating current. The impedance measurement device shortens the measurement time for measuring the alternating current and the voltage fluctuation as the magnitude of the correlation parameter correlated with the magnitude of the impedance changes in a direction in which the impedance increases.SELECTED DRAWING: Figure 1

The invention discloses an electrolyte and a battery, and belongs to the technical field of electrolytes. The electrolyte comprises a multifunctional additive, and the multifunctional additive comprises fluorinated esters containing unsaturated bonds and sulfonic acid groups or sulfuric acid groups. Compared with a traditional film-forming additive, the multifunctional additive can preferentially form a film, so that a thinner and more compact solid electrolyte interface film can be formed, and the problem that an oxygen free radical-electrolyte solvent intermediate generates reducing gas at a negative electrode is solved. The multifunctional additive can form films on a negative electrode and a positive electrode, and is beneficial to reducing decomposition and oxygen release of a positive electrode lithium supplement agent in a cyclic storage process. The multifunctional additive contains sulfonic acid or sulfuric acid groups, so that the impedance of the battery can be reduced, and the high-temperature cycle and storage performance of the battery can be improved; the fluorine element contained in the electrolyte tends to generate lithium fluoride during film forming, so that the lithium ion diffusion energy barrier is reduced, the mechanical stability of a solid electrolyte interface film is improved, the formation of lithium dendrites is avoided, and the electrochemical performance is improved.

The application discloses an iridium oxide modified fluorine-doped tin oxide electrode and a preparation method and application thereof. The electrode comprises a light-transmitting fluorine-doped tin oxide conductive glass substrate and an in-situ attached iridium oxide nano-modified layer. The preparation method comprises the following steps: preparation and aging of a precursor solution, alternating current electrochemical deposition, annealing and cleaning, and laser patterning treatment. The application further discloses a cell impedance sensor organ chip system comprising the electrode and application of the system in in-vitro drug screening. The application utilizes the low cost and light-transmitting property of the fluorine-doped tin oxide and the excellent charge injection capacity of the alternating current deposited iridium oxide nano layer to greatly reduce the interface impedance. The scheme meets the in-situ optical observation, realizes the high-sensitivity biological impedance monitoring comparable to gold electrodes, effectively solves the problems of high cost and complex process of the existing organ chip electrode, and is very suitable for popularization and application as a disposable high-throughput consumable.

The invention relates to the technical field of direct-current power supply monitoring, and discloses an integrated direct-current power supply remote online monitoring method and system. The method comprises the following steps: collecting battery operation data, and carrying out signal smoothing and de-noising processing to obtain a battery impedance basic value; carrying out characteristic analysis according to the battery impedance basic value, and determining an impedance trend characteristic; if the impedance trend characteristic exceeds a threshold value, combining historical backtracking data and a system load state, extracting an impedance deviation sequence and performing judgment to obtain a health state evaluation result; carrying out error fusion and deviation correction according to the health state evaluation result, and determining residual electric quantity data; and generating a system state log according to the residual electric quantity data, and updating power management parameters according to the system state log. According to the method, the dynamic capture of the impedance change of the battery and the accurate correction of the residual electric quantity can be realized, and the monitoring reliability and the self-adaptive management capability of the power supply system are remarkably improved.

An apparatus and a method for diagnosing a battery cell. The apparatus may include a reference cell module including at least one reference cell composed of a super-capacitor, a measuring device configured to measure a reference impedance of the reference cell and a battery impedance of the battery cell, and a processor configured to compare the battery impedance with the reference impedance to determine whether there is an abnormality in the battery cell.

An apparatus for estimating a battery parameter according to an embodiment of the present invention comprises: an impedance measuring unit configured to deliver multiple alternating currents to a battery and measure multiple battery impedance values ​​corresponding to the multiple alternating currents; and a control unit configured to adjust the multiple impedance values ​​to generate a first profile, correct the multiple impedance values ​​on the basis of the first profile, determine multiple reference values ​​on the basis of the corrected multiple impedance values, adjust the determined multiple reference values ​​to generate a second profile, compare the second profile with the corrected multiple impedance values, and determine whether a battery parameter should be set according to the result of the comparison.

An exemplary method and system is disclosed that facilitate the integration of multiplexed single-cell impedance cytometry in a high throughput format, which can be deployed upstream from microfluidic sample preparation and / or downstream to microfluidic cell separation. In exemplary method and system may employ impedance-based quantification of cell electrophysiology on the same microfluidic chip (i.e., “on-chip”) to provide distinguishing phenotypic information on the sample, without the need for additional sample handling, preparation or dilution steps as would be needed for other flow cytometry techniques.

This application relates to electrolytes, batteries, and electrical devices, belonging to the field of battery technology. By adding specific cyclic sulfate compounds to the electrolyte and controlling their mass percentage in the electrolyte, the NMR shift value of the central carbon atom in the electrolyte, and the geometric mean of the electrolyte's ionic conductivity at 40°C and at -10°C satisfying a specific relationship, this application ensures that the cyclic sulfate compounds rapidly form a film, providing good protection for the positive and negative electrodes and improving battery cycle performance. Simultaneously, it reduces the adverse effects of their addition on battery impedance and electrolyte conductivity, reduces polarization during charging, and improves fast-charging performance. Thus, the battery can achieve a balance between good cycle performance and fast-charging performance, especially high-temperature cycle performance and low-temperature fast-charging performance, exhibiting excellent overall electrochemical performance.

The present application provides a kind of big granule glue for diaphragm, diaphragm coating slurry, diaphragm and battery, the big granule glue is copolymer, the copolymer includes: aromatic ethylene structural unit;Acrylate structural unit;Crosslinking structural unit, the side chain of the crosslinking structural unit contains reactive functional group, the reactive functional group includes one or more of epoxy group, isocyanate group, siloxane group, hydroxyl group, amino group, carboxyl group and unsaturated hydrocarbon group;And acrylamide structural unit, the acrylamide structural unit contains imidazolidinone group, to overcome the problem that existing ceramic diaphragm exists high battery impedance and insufficient rate performance.