211 results about "Ac impedance" patented technology

The invention belongs to the technical field of battery energy storage, and discloses a method, system, equipment and medium for evaluating the internal temperature of an energy storage lithium ion battery, and the method comprises the steps: obtaining the AC impedance data of the battery at a characteristic frequency, including a real part, an imaginary part, a module value and a phase angle; inputting the real part, the imaginary part, the module value and the phase angle into a battery internal temperature estimation model to obtain the internal temperature of the battery in the current state; the characteristic frequency is the frequency that the Pearson correlation coefficients of the real part, the imaginary part, the module value and the phase angle and the temperature meet correlation, and the frequency that the Pearson correlation coefficients of the real part, the imaginary part, the module value and the phase angle and the state of charge meet ircorrelation. According to the method, the real thermal state in the battery is reflected through the impedance data, and high-precision estimation of the internal temperature of the battery is achieved. Only the characteristic frequency is measured, so that the test time can be greatly shortened; the temperature data can be quickly estimated, the evaluation response speed is obviously improved, and the method has high engineering application value.

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

The invention relates to the technical field of batteries, in particular to a battery charging and discharging control method and device, a battery and terminal equipment, and the method comprises the steps: obtaining an impedance real part; the impedance real part is obtained according to the alternating current impedance spectrum of the target battery under the preset excitation signal frequency; acquiring the current internal temperature of the target battery according to the impedance real part and a temperature calculation formula; querying a pre-stored maximum charge-discharge rate table according to the current charge state and the current internal temperature of the target battery to obtain a current maximum charge-discharge rate; and controlling the target battery to perform charging and discharging operation according to the current maximum charging and discharging rate. Therefore, the target battery is charged and discharged by using the accurate charge-discharge rate, battery abuse can be prevented, the service life of the battery is prolonged, and the safety of the battery is ensured.

The invention discloses a high-power alternating-current impedance excitation circuit, a control method thereof and an electrolysis test system, and belongs to the technical field of power supplies and power electronics, the circuit is used as an alternating-current power supply in a high-capacity electrolysis test power supply, and the circuit is controlled by a controller to output an alternating-current signal so as to carry out an impedance test on an electrolytic bath. Compared with a full-bridge circuit, the alternating-current impedance excitation circuit adopts the multi-level converter, so that the output current harmonic content is low, the electrolysis efficiency is improved, the equipment loss is reduced, the economical efficiency of an electrolysis system is improved, stable operation of an electrolytic bath is ensured, and electrolysis interruption or faults caused by voltage fluctuation are reduced.

The invention relates to the technical field of charge and discharge detection, and discloses a multichannel EIS charge and discharge in-situ test system and method, and the system comprises a DC charge and discharge module which is used for carrying out the constant-current, constant-voltage or cyclic charge and discharge test of a battery; the alternating current impedance test module is connected in parallel with the direct current charging and discharging module and is used for applying an alternating current disturbance signal to the battery and collecting impedance response in the charging and discharging process; and the unified clock module is used for providing a synchronous triggering reference signal for the direct current charging and discharging module and the alternating current impedance test module. The direct current charging and discharging module and the alternating current impedance test module are designed to be of a parallel connection normally-connected structure, no relay switching is needed, continuous and uninterrupted online EIS test in the charging and discharging process is achieved, contact resistance drift and transient errors caused by physical circuit switching in a traditional scheme are effectively avoided, and the reliability of the EIS test is improved. And the stability and repeatability of the test are obviously improved.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

The invention discloses an AEM water electrolysis membrane electrode failure diagnosis method. The method comprises the following steps: inputting carrier waves with different alternating-current amplitudes when the AEM water electrolysis membrane electrode is in normal operation, carrying out carrier wave analysis, determining the magnitude of the alternating-current amplitudes, and obtaining a standard spectrogram of electrochemical alternating-current impedance and total harmonic distortion in a normal state; the method comprises the following steps: monitoring the operation of an AEM water electrolysis membrane electrode, entering a diagnosis mode after performance change, inputting a carrier wave, carrying out an electrochemical AC impedance test and a total harmonic distortion test at the same time, and carrying out Fourier transform processing on an output electrochemical AC impedance signal to obtain an electrochemical AC impedance spectrum; processing the output harmonic signal to obtain a total harmonic distortion spectrum; and comparing the total harmonic distortion spectrum with the standard spectrogram obtained in the step 1 by combining the electrochemical alternating current impedance spectrum, and identifying the failure type of the AEM water electrolysis membrane electrode. The method can effectively diagnose the failure mode of temperature change, electrolyte metering change and cathode and anode pressure change of the AEM water electrolysis membrane electrode.

The invention discloses a relay state diagnosis method and system, electronic equipment and a storage medium. The method comprises the following steps: sending a preset frequency voltage to a to-be-tested relay to obtain an AC impedance value corresponding to the preset frequency voltage, and diagnosing the health state of the to-be-tested relay through the AC impedance value. According to the invention, the voltage difference between the two ends of the relay is not detected any more, and the health state of the relay at each position is diagnosed by directly detecting the electrochemical alternating-current impedance spectrum of the relay, so that the problem that the half-damage condition that the relay is not adhered or cannot be attracted cannot be diagnosed in the prior art is solved; and under the condition that the main negative relay is not connected with the terminal system, correct diagnosis cannot be made through the voltage difference between the two ends of the main negative relay.

The utility model discloses an ultrasonic beauty instrument based on multi-feedback automatic adjustment. The ultrasonic beauty instrument comprises a transducer, a drive circuit, a single chip microcomputer, an alternating current impedance detection unit, a temperature detection unit and a voltage and current detection unit. The skin impedance is detected through the alternating current impedance detection unit, the output of the driving circuit is adjusted, and then the ultrasonic intensity of the transducer is adjusted; the skin surface temperature is detected through the temperature detection unit, when it is detected that the skin temperature reaches a threshold value, output of ultrasonic waves is stopped, and a user is protected from being scalded; an output ultrasonic signal is monitored in real time through the voltage and current detection unit to adjust the frequency of an ultrasonic excitation signal output by the driving circuit, so that the transducer works on a resonance point all the time, automatic frequency tracking is achieved, and the accuracy of the output ultrasonic power is improved. Therefore, frequency tracking is carried out through multiple feedback modes of voltage and current detection, temperature detection and alternating current impedance detection, and the ultrasonic output intensity is automatically adjusted, so that a better use effect is achieved, and the use experience of a user is improved.

The invention provides a non-isolated LED power supply minuteness-removing turn-off circuit, which comprises a second power supply processing module, a minuteness-removing turn-off module and an LED lamp module, and is characterized in that the second power supply processing module is used for converting a high-voltage direct-current power supply into an LED lamp module working power supply; the micro-brightness removal turn-off module is arranged between the output end of the second power supply processing module and the LED lamp module and comprises a direct-current impedance conversion unit, an alternating-current impedance conversion unit and a switching tube, and the switching tube is arranged on a direct-current loop; and the control unit of the second power supply processing module reduces the DC voltage and the non-isolated AC induced voltage to be below the set voltage through the switching signal and the DC impedance conversion unit and the combined action of the switching signal and the AC impedance conversion unit, thereby realizing the minuteness-removing turn-off of the LED lamp module. According to the invention, contactless switch control can be realized, circuit loss is reduced, and working noise is reduced.

A device includes an AC impedance circuit to apply an AC excitation signal to a set of battery cells of a battery pack. The device includes a controller to determine a battery pack identification (ID) value from a battery pack identification (ID) circuit of the battery pack, calculate an impedance value of the battery pack based on the AC excitation signal, identify a maximum charging rate to charge the battery pack using the battery pack ID value of the battery pack and the impedance value of the battery pack, where the battery pack is one of at least two battery packs having a same battery pack ID value with different maximum charging rates, and set a charging rate to charge the battery pack using the maximum charging rate.

The invention discloses a fault diagnosis method, device and equipment for a fuel cell and a storage medium. The fault diagnosis method of the fuel cell comprises the following steps: analyzing fusion fault data according to an alternating current impedance spectrum of a newly added fuel cell; analyzing the reliability of the fused fault data; when the reliability of the fused fault data reaches a preset fusion threshold value, using the fused fault data to train a preset fault diagnosis model; and diagnosing the fault type of the fuel cell through the trained fault diagnosis model. According to the technical scheme of the invention, the fault diagnosis model can be continuously adjusted according to the fused fault data, so that the fault diagnosis model can be adaptively adjusted according to the aging of the fuel cell and the change of the operation environment, and the accuracy of a fault diagnosis result is ensured.

A battery pack includes a set of blocks of battery cells, where each of the blocks is connected in series, and a set of AC impedance circuits, where each of the AC impedance circuits is electrically connected to at least one of the blocks of battery cells in the set of blocks of battery cells to apply an AC excitation signal to the at least one of the blocks in the set of blocks. The battery pack includes a controller configured to: calculate an impedance value for each of the at least one of the blocks of battery cells based on the AC excitation signal applied to each of the at least one of the blocks of battery cells, and adjust a parameter of the battery pack based on the calculated impedance value for each of the at least one of the blocks of battery cells.

A multi-objective optimization method for a circular wireless charging coil of an electric vehicle comprises the following steps: constructing an equivalent circuit model of an S-S type resonance compensation topological structure of a wireless power transmission system, and carrying out alternating current impedance analysis on the equivalent circuit model to obtain an expression of system output power and transmission efficiency; determining an optimization target according to the derived system output power and transmission efficiency expression; building a circular wireless charging coil model, determining a wireless charging coil design variable needing to be optimized, and determining a constraint condition; and carrying out parameter optimization by adopting an improved multi-target samson swarm algorithm to obtain optimal design parameters of the wireless charging coil of the wireless power transmission system. According to the method, the problem that the transmission power and efficiency of the wireless power transmission system are unstable when a coupling mechanism of the wireless power transmission system deviates is solved; the optimized wireless charging coil can effectively improve the stability of wireless charging of the electric vehicle.

A computer-implemented method for Li-plating detection of a cell of a power battery. The method includes: obtaining a plurality of AC impedance values for the cell measured at a plurality of States of Charge (SOCs), in which the plurality of AC impedance values are measured in a non-driving state of a vehicle; fitting the AC impedance values as a function of SOC based on the plurality of AC impedance values; and calculating a goodness of fit for the function, and calculating a Li-plating score for the cell based on the goodness of fit, in which the Li-plating score is used to indicate a degree to which Li-plating occurs in the cell.

The invention discloses a cell health state estimation method and system based on AC impedance, and the method comprises the steps: obtaining a plurality of sample health state values of a sample cell under each aging path based on a plurality of preset aging paths and a plurality of preset sample cells; according to a preset characteristic frequency, carrying out an AC impedance test on the sample cell corresponding to each sample health state value to obtain a sample real part impedance value corresponding to each sample health state value; fitting the plurality of sample health state values and the plurality of sample real part impedance values corresponding to the plurality of sample cells to obtain an estimation model of the sample health state values converted along with the sample real part impedance values; and obtaining a real part impedance value corresponding to the target test cell according to the characteristic frequency, so as to obtain the health state value estimation value of the target test cell from the estimation model according to the real part impedance value, thereby improving the estimation efficiency and precision.

The invention relates to the technical field of lithium battery charging equipment, in particular to an overcharge protection lithium battery charger which comprises a shell, a charging protection board circuit and an output power port. The charging protection board circuit is provided with a monitoring protection module, a mechanical protection module and a logic control module. The monitoring protection module accurately identifies an overcharge abnormal state by measuring a lithium battery AC impedance spectrum in real time, and rapidly triggers the electronic protection unit to execute a cut-off action. And if the electronic protection fails, the mechanical protection module acts quickly, and the charging loop is physically disconnected. The logic control module coordinates automatic switching of the two protection modes, and the intelligence and reliability of protection are improved. The lithium battery charger is simple and reasonable in structure, high in monitoring sensitivity and rapid and reliable in protection action, has a perfect redundancy protection structure and a convenient reset mechanism, effectively overcomes the defects in the prior art, and remarkably improves the safety performance and reliability of the lithium battery charger.

The present invention relates to the field of measurement application technology, and in particular to a high-precision AC impedance test device, comprising a tester, wherein a power control component is fixedly connected to the top of the tester, wherein the power control component comprises a cover plate and a fixing seat, wherein the cover plate is fixedly connected to the top of the fixing seat, wherein the fixing seat is fixedly connected to the tester, wherein the middle portion of the cover plate is rotatably connected to an anti-false touch member, wherein both sides of the bottom of the cover plate are fixedly connected to support rods, wherein the bottom between the two support rods is fixedly connected to an arc rod, wherein both sides of the top of the arc rod are provided with a penetrating arc groove, and further comprising a control method for a high-precision AC impedance test device. The present invention rotates and presses the anti-false touch member, wherein the output end of the anti-false touch member can be accurately slid into the arc groove, and the press switch is operated. Compared with the existing control switch, the possibility of false operation is reduced, and the use of the tester is facilitated.

A battery impedance measuring device 1 measures the AC impedance of a battery pack 3. FETs 5 and 6 are arranged in a path through which an excitation current flows from the battery pack 3, and a shunt resistor 7 is energized with the excitation current through the FETs 5 and 6. An excitation current control unit 13 and a diagnosis control unit 14 control the turning on and off of the FETs 5 and 6, respectively, and a current detection circuit 15 measures the voltage of the shunt resistor 7. An error determination circuit 16 diagnoses the conduction state of the FETs 5 and 6, on the basis of the on / off state of the FETs 5 and 6 controlled by the control units 13 and 14 and the result of energization of the shunt resistor 7.

The present invention provides a fuel cell single-chip consistency evaluation device and method. The device includes a fuel cell system, a bidirectional DC / DC converter, a vehicle power battery, a shutdown backup battery and a controller. The controller is used to supply power to the fuel cell system through the shutdown backup battery when the fuel cell system is in a shutdown state, and to control the bidirectional DC / DC converter to apply a preset AC disturbance signal to the fuel cell system to determine the AC impedance value of each single chip in the fuel cell system, and to determine the result of the fuel cell single-chip consistency evaluation based on each AC impedance value, thereby realizing accurate fuel cell single-chip consistency evaluation after the fuel cell system is shut down, and thereby more reliably monitoring the fuel cell system.

The present invention discloses a high-precision and low-power AC impedance measurement circuit and method. The circuit includes: a waveform generator; a first isolation buffer, whose positive input terminal is connected to the sine wave signal output terminal; a switching circuit, which is connected to the negative input terminal and the output terminal of the first isolation buffer; a to-be-measured impedance and a reference impedance, which are connected to the switching circuit; an operational amplifier, whose positive input terminal is connected to a reference voltage, and whose negative input terminal is connected to the to-be-measured impedance and the reference impedance; a sampling impedance, which is connected between the negative input terminal and the output terminal of the operational amplifier; a first selection switch, which is connected between a second isolation buffer and the to-be-measured impedance or the reference impedance; a second selection switch, which is connected between a third isolation buffer and the operational amplifier; a fully differential I / Q modulation rectifier, which is used for rectifying the received signal; a low-pass filter; an analog-to-digital converter; and an MCU / DSP module, which is used for calculating the modulus value and the phase angle of the to-be-measured impedance. The present invention can improve the measurement accuracy of the to-be-measured impedance and reduce the power consumption.

The application discloses a simplification construction method of a high-frequency impedance theoretical model of a flexible DC converter station, and comprises the following steps: obtaining data information of a target flexible DC converter station; calculating positive and negative sequence electrical quantity data information of the target flexible DC converter station; adopting a harmonic state space method to construct an alternating current impedance theoretical model of the target flexible DC converter station; simplifying the constructed model at a high frequency; uniformly performing frequency shift representation on positive and negative sequence impedances of the target flexible DC converter station; and completing the simplification construction of the high-frequency impedance theoretical model of the target flexible DC converter station. The application further discloses a system for realizing the simplification construction method of the high-frequency impedance theoretical model of the flexible DC converter station. The application not only realizes the simplification construction of the high-frequency impedance theoretical model of the flexible DC converter station, but also has better accuracy and higher reliability, and the modeling process is simpler.

A battery module includes n batteries, n≥3. The n batteries are stacked in a sequence along a thickness direction of the battery, and m is defined as a round number of n / 2, and the first battery and the m-th battery satisfy at least one of the following conditions: a1: a capacity of the m-th battery is greater than that of the first battery; b1: under a same state of charge, an open circuit voltage of the m-th battery is less than that of the first battery; and c1: under a same state of charge, an AC impedance of the m-th battery is less than that of the first battery.

The present invention discloses a method for quickly sorting the consistency of power batteries. The power batteries are detected by the AC impedance test method, and the EIS test data of the batteries is dimensionally reduced to extract characteristic quantities for reflecting the battery performance, which helps to accelerate the sorting speed. Regarding the sorting problem of batteries, an adaptive clustering sorting method is proposed. This method uses the density of data to obtain the number of clusters and the initial values of the cluster centers to achieve preliminary sorting of the batteries, and then optimizes the sorting results according to the distances from the data points to the cluster centers to achieve further sorting. Existing methods often require a large number of battery samples for pre-training or need to determine the number of battery clusters in advance for sorting, with low test efficiency and inapplicable to the sorting of large-scale batteries. When sorting the batteries, the present invention has a relatively fast sorting speed, the batteries in the same group have good consistency, and the proposed method has good applicability to different types of batteries.

The invention discloses a high-precision multi-channel data acquisition method, relates to the technical field of multi-channel data acquisition, and is used for solving the problem that the risk of beam mode distortion caused by pumping current fluctuation is increased. Pumping current is acquired in a laser cavity to calculate a fluctuation coefficient, and an alternating-current impedance amplitude is acquired in combination with impedance detection; carrying out standardized multiplication to generate an electric strength coefficient, calibrating a statistical coefficient in time to obtain a reference threshold value, calling a gain factor, obtaining a light beam radius variable quantity by using an extra-cavity detector, calculating a down-regulation ratio to obtain a down-regulation threshold value, comparing the electric strength coefficient with the down-regulation threshold value, and if a light beam mode is distorted, carrying out standard multiplication; if yes, triggering the multi-channel wavefront sensing array to collect information and check triggering consistency, and if not, correcting a current fluctuation coefficient based on light beam intensity, combining impedance to generate an update coefficient, comparing the update coefficient with a down-regulation threshold value, and if the update coefficient exceeds the limit, triggering an alarm and outputting a protection instruction; and beam mode distortion caused by pumping current fluctuation is effectively avoided.

The present invention relates to a method for accurately measuring the chloride ion content of the rust layer on the surface of a bronze object. The method comprises the following steps: mixing water-soluble CS, ALg, and PVA, adding AgNO3 dropwise, stirring to form a homogeneous sol, heating at 50°C to form a cross-linked gel, and obtaining an ALg-CS-Ag hydrogel; preparing artificial rust powder; cutting the hydrogel into small pieces and adding each piece to the rust powder, ensuring that one side of the hydrogel is in full contact with the rust powder for adsorption; simultaneously attaching ALg-CS-Ag hydrogel pieces of the same size to the surface rust layer of a bronze object fragment for adsorption; waiting for 21-27 hours, removing or peeling off the adsorbed hydrogel; soaking the hydrogel in deionized water until it is completely swollen; performing an AC impedance test and fitting the test results to an equivalent circuit to obtain a resistance value; plotting a relationship between the inverse of the resistance value and the chloride ion concentration and performing a linear fit to obtain a fitting function, which is substituted into the fitting function to calculate the chloride ion content of the rust layer on the surface of the bronze object. The method has the advantages of being non-destructive, highly accurate, and convenient and rapid.

The invention belongs to the technical field of electromagnetic detection, and particularly relates to a conductive adhesive for improving the stability of an electromagnetic detection sensor and a preparation method. The invention firstly provides a conductive adhesive for improving the stability of an electromagnetic detection sensor. The conductive adhesive comprises a first functional composition, a second functional composition and a function initiation component, the first functional composition is prepared from p-hydroxyanisole, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, sodium hydroxide and potassium chloride; the second functional composition comprises a dissolving agent, a viscosity agent, a humectant and water; the functional initiating component is composed of a photoinitiator and a cross-linking agent. The conductive adhesive prepared by the invention is high in data stability and low in alternating current impedance in electromagnetic detection.

The invention discloses a multifunctional tester for electric power new energy electrical equipment, and relates to the technical field of new energy electrical multifunctional tests. The multifunctional tester for the electric power new energy electrical equipment comprises a tester main body, a protective shell and a protective cover, the upper surface of the tester main body is fixedly connected with a direct-current voltage measurement digital display meter, a direct-current measurement digital display meter, an alternating-current voltage measurement digital display meter, an alternating-current measurement digital display meter, a power supply display lamp, a working position display lamp, a zero position display lamp and an alternating-current and direct-current conversion switch, and the interior of the tester main body is fixedly connected with an isolation voltage regulator. The top of the isolation voltage regulator is provided with an adjusting knob, the upper surface of the tester main body is provided with a power jack and a wiring hole, and the inner surface of the protection housing is fixedly connected with a first elastic plate and a second elastic plate, thereby solving the blank field of no test instrument for the AC impedance of the wind driven generator rotor, and enabling the test work difficulty of a new energy station to be simplified.

The present application relates to a kind of taste sensor based on electrical signal, preparation method and its detection method.Taste sensor device structure is constituted by one metal / metal oxide functional electrode and three Ag / AgCl electrodes deposited on substrate, wherein metal layer and Ag electrode are deposited on substrate by evaporation deposition, and metal oxide functional layer and AgCl layer are formed on it by electrochemical method, and taste simulation and identification function are realized by measuring the potential between metal / metal oxide functional electrode and Ag / AgCl electrode and the conductance and alternating current impedance between the other two Ag / AgCl electrodes.The taste sensor of the present application has the characteristics of simple preparation process, fast measurement response and wide application, etc.

The present application provides an aerosol generation system and a control method. The aerosol generation system comprises: a susceptor for heating an aerosol-generating substrate to generate an aerosol; an LC oscillator comprising an induction coil and a capacitor, the LC oscillator being configured to guide an alternating current to flow through the induction coil, thereby driving the induction coil to supply energy to the susceptor so that the susceptor heats the aerosol-generating substrate; and a controller programmed to determine an alternating-current impedance of the susceptor by means of a resonance voltage of the LC oscillator, and further programmed to determine the temperature of the susceptor by means of the alternating-current impedance of the susceptor. According to the aerosol generation system, the working temperature of the susceptor is controlled by means of detecting the alternating-current impedance of the susceptor during operation.