298 results about "Impedance testing" patented technology

The invention provides a method for predicting the residual life of a decommissioned power battery cell, and the method comprises the steps: carrying out the impedance testing of different frequencies of a to-be-tested battery cell in a decommissioned power battery in a preset testing frequency range, obtaining the impedance response data at different frequencies, and obtaining the impedance spectrum data; utilizing scene conditions corresponding to different steps are obtained, the utilizing scene conditions comprise the temperature range and the charging and discharging multiplying power, and a target step utilizing scene is matched in combination with the step grade to which the current to-be-detected battery cell belongs; performing associated storage on the target step utilization scene and the model, capacity, internal resistance and impedance spectrum data information of the retired battery cell to form a retired battery step utilization scheme; if it is detected that the battery is in an abnormal state, an early warning mechanism is triggered, and corresponding safety protection measures including cutting off a power source and starting a cooling system are taken according to a preset processing strategy.

The invention relates to a power distribution cable line fault positioning device, and the device comprises a control unit which comprises a system host and is responsible for receiving data of each module and carrying out the comprehensive analysis and processing; the data acquisition unit provides basic data for fault positioning through a cable path instrument, measures the broadband impedance change of the cable through a broadband impedance tester, and assists in judging the fault type and position; the preliminary positioning unit is used for transmitting a high-voltage pulse signal through a pulse current generator, accurately receiving a current pulse waveform generated during discharging or breakdown through a current coupler, and preliminarily positioning a fault point; a time domain reflection measuring instrument of the accurate positioning unit accurately determines the fault position by measuring the propagation time of the high-voltage pulse signal in the cable; and the artificial intelligence processing unit performs intelligent analysis on the data by integrating machine learning and a deep learning algorithm. According to the fault positioning device and the diagnosis method, the fault of the distribution cable line can be quickly and accurately positioned, the operation is convenient, and the implementation is easy.

According to the impedance test method for the multi-layer and multi-order printed circuit board and the circuit board provided by the embodiment of the invention, the through hole is formed in the inner layer circuit board, the impedance of the inner layer circuit board is tested through the through hole, and the impedance of the inner layer circuit board is tested, so that the circuit board can work normally, and the performance and reliability of electronic equipment are improved. After a layer of outer layer circuit board is added on the outer layer circuit board, a blind hole is manufactured on the outer layer circuit board based on a through hole PAD, a test PAD is made by using the blind hole, and impedance test is performed on the added outer layer circuit board, so that the impedance of the current layer can be measured in time during layer addition, and the impedance can be measured without waiting for a finished product. The actual impedance of each layer can be measured, the rejection rate of the impedance of a final finished product is reduced, the production efficiency is improved, and the cost is reduced.

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 discloses a direct-current impedance testing method and device and a medium, and relates to the field of battery testing, and the method comprises the steps: testing impedance data of a target battery at different frequencies based on an electrochemical impedance spectroscopy testing method; based on the impedance data of the target battery under different frequencies, performing parameter fitting on the constructed equivalent circuit model to obtain impedance parameters of each component of the equivalent circuit model; determining a time domain differential equation set according to the impedance parameter of each component of the equivalent circuit model; according to the current values of the target battery at any two moments, through the time domain differential equation set, overpotential values caused by each component of the equivalent circuit model at the two moments are calculated; calculating a voltage value of the target battery at each moment according to an overpotential value caused by each component of the equivalent circuit model at each moment; calculating a DC impedance value of the target battery according to the voltage values and the current values of the target battery at the two moments; according to the invention, lossless and rapid testing of the DC impedance of the battery is realized.

The invention discloses a lithium ion battery thermal runaway early warning method and a multi-frequency real-time impedance test system, and belongs to the field of lithium ion battery safety. The method comprises the following steps: screening a frequency range sensitive to temperature change and insensitive to charge state change through an electrochemical impedance spectroscopy experiment, selecting a characteristic frequency by adopting an RReliefF algorithm, carrying out real-time monitoring on an impedance module value under the characteristic frequency, and judging a safety state and carrying out first-stage, second-stage and third-stage early warning based on a preset strategy; according to the multi-frequency real-time impedance test system provided by the invention, through multi-frequency synchronous excitation, synchronous acquisition and fast Fourier transform analysis, a multi-characteristic frequency impedance measurement period is compressed to be within 0.3 second, and thermal runaway transient impedance change can be captured. The lithium ion battery thermal runaway early warning method can achieve lithium ion battery thermal runaway full-stage grading early warning, is high in early warning accuracy and time resolution, is stable and effective in a 0-100% full SOC range and in batteries of different chemical systems, and provides reliable technical support for lithium ion battery thermal runaway safety protection.

The invention provides a chip substrate performance detection device and method, and belongs to the technical field of chip detection.The chip substrate performance detection device is characterized in that a partition plate is arranged in a detection shell to form a containing cavity and an equipment cavity, a detection isolation hood forming a detection cavity is arranged at the top of the partition plate, and a heating isolation hood forming a heating cavity is arranged at the bottom of the partition plate; the impedance tester is electrically connected with four groups of test chip probes mounted on the chip clamp and is used for acquiring an impedance spectrum sequence; the alternating current and direct current parameter tester is electrically connected with a probe matrix installed at the top of the detection isolation cover to obtain a bonding pad electrical performance matrix sequence, and the probe matrix is provided with a plurality of groups of displacement sensors used for obtaining vertical displacement feedback data; the control module is used for acquiring a substrate performance comprehensive evaluation report and transmitting the report to the display terminal; the chip substrate does not need to be transferred among different devices, a high-temperature and corrosion composite environment can be synchronously simulated, performance detection can be realized, and interference of environment change or mechanical contact on detection data in the transfer process is avoided.

The invention discloses a ripple resonance point vibration adding test method, device and equipment of a vehicle electric drive system, and relates to the technical field of intelligent automobiles, and the method comprises the steps: controlling a vehicle to operate under a plurality of different real vehicle working conditions, testing the whole vehicle high-voltage inner reticulate wave of the vehicle, and obtaining the high-voltage inner reticulate wave of the vehicle; obtaining whole vehicle ripple data corresponding to each real vehicle working condition; impedance testing is conducted on the electric driving system of the vehicle, and the resonant frequency of the electric driving system is determined based on obtained impedance data; the method comprises the following steps: carrying out initial test on an electric driving system, carrying out initial test on the electric driving system, and obtaining basic test data of the electric driving system; in the process of controlling the electric driving system to perform fixed-frequency operation according to the resonant frequency, inputting a ripple signal to the electric driving system based on the whole vehicle ripple data to obtain resonance point vibration adding test data of the electric driving system; and analyzing the basic test data and the resonance point vibration adding test data to obtain a resonance point vibration adding test evaluation result of the vehicle.

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 provides a three-dimensional noise reduction structure system drainage pipe design method, and belongs to the technical field of building drainage pipes. Discretization analysis is carried out on a three-layer structure of a spiral flow guide structure PVC pipe inner wall, an asymmetric butyl rubber damping interlayer and gradient density foamed aluminum by establishing a three-dimensional noise reduction model; and constructing a vibration transfer matrix and a noise reduction key point matrix. A spiral flow guide structure is optimized through hydraulic calculation, thickness distribution of a rubber damping layer is determined through acoustic impedance testing, foamed aluminum porosity gradient design is carried out, and a small-section noise reduction cross-correlation index is introduced to evaluate the synergistic effect of adjacent structures. The optimal material ratio is solved through a three-dimensional noise reduction optimization equation set, the noise reduction effect is predicted in combination with an acoustic response deep learning model, standardized module design is finally formed through miniaturized sample piece test verification and parameter correction, and organic unification of full-band noise reduction and modular design of the drainage pipe is achieved.

The invention provides a safe charging control method and device of a lithium battery, equipment and a storage medium, and relates to the technical field of lithium batteries. The method comprises the following steps: carrying out impedance test on a lithium battery to obtain a target voltage interference signal indicating that a battery cathode responds and a battery anode does not respond; and then charging the lithium battery, and carrying out capacitance test on the cathode of the lithium battery in real time according to the target voltage interference signal to obtain the cathode capacitance value of the lithium battery in the current charging state. And when it is determined that the negative capacitance value of the lithium battery in the next charging state adjacent to the current charging state meets a preset condition, determining an electric quantity value range according to the electric quantity of the lithium battery corresponding to the current charging state. And in the subsequent charging process of the lithium battery, the electric quantity of the lithium battery is controlled to be within the electric quantity value range. According to the invention, safe charging of the lithium battery can be realized.

The invention provides an active control multi-time scale electrolytic bath impedance detection method, and relates to the field of electrolytic hydrogen production, and the method comprises the following steps: determining at least two time scales corresponding to a current detection target; acquiring electrolytic cell working condition information, and determining an optimal frequency band of a time scale corresponding to the current detection target based on the electrolytic cell working condition information; determining a signal amplitude based on the working condition information of the electrolytic cell; determining a data acquisition interval corresponding to the time scale corresponding to the current detection target based on the working condition information of the electrolytic cell; based on the optimal frequency band, the signal amplitude and the data acquisition interval corresponding to each time scale, performing multi-frequency-band alternate scanning on the electrolytic cell to obtain scanning data; the method and the device have the advantage that the precision and the efficiency of the impedance measurement of the electrolytic cell under the dynamic working condition are improved.

The invention relates to the technical field of grid connection of new energy units, in particular to a control parameter identification method and system for a grid-connected converter of a new energy unit, a storage medium and a processor. The method comprises the following steps: establishing a high-frequency impedance model of a new energy unit grid-connected system, and determining to-be-identified parameters including a proportionality coefficient of a current inner ring of a converter, an integral coefficient of the current inner ring of the converter and control delay of the converter; harmonic voltage disturbance under different frequencies is applied, harmonic currents of a unit under different frequencies are measured, then impedance values under three different frequencies are obtained, the impedance values under the three different frequencies are input into a high-frequency impedance model of the new energy unit grid-connected system, and the high-frequency impedance model of the new energy unit grid-connected system is obtained. And solving the high-frequency impedance model of the new energy unit grid-connected system to obtain a to-be-identified parameter. The model involved in the method is low in order, the control parameters of the current inner loop of the converter can be obtained only through a small number of impedance tests and equation set calculation, and the method has the advantages of being high in identification efficiency and accuracy.

The invention relates to the technical field of electrical equipment testing, and discloses a high-precision anti-interference intelligent transformer short-circuit impedance testing machine which comprises an isolation power supply module and a testing host module, an electrostatic shielding layer is arranged in the isolation power supply module, a suspension working power supply isolated from power grid noise is provided for a testing host, and the anti-interference capability is improved from the source. The test host module integrates a power management and inversion module to generate a controllable three-phase AC excitation signal, and the central processing and control module performs closed-loop feedback control on a test current according to a high-precision synchronously acquired signal, so that an external voltage regulator is replaced, and automatic stabilization of a test condition is realized. According to the invention, tedious manual adjustment is not needed, full automation of the testing process is realized, and the precision, repeatability and safety of short-circuit impedance testing are remarkably improved.

The utility model provides a camera module elargol impedance testing device. The camera module elargol impedance testing device comprises an upper cover and a base, the upper surface of the base is provided with a containing groove used for containing the camera module, and the upper cover is detachably arranged on the base; the upper surface of the base is provided with a connecting guide pin used for being electrically connected with the test box. The lower surface of the upper cover is provided with a switching copper block and a plurality of test PINs, and the test PINs are electrically connected with the switching copper block. According to the camera module testing device, the testing PINs are fixedly arranged at the upper cover, so that the testing PINs can be ensured to be in contact with the same point of different camera modules during testing each time, the detection precision can be improved, meanwhile, different testing PINs correspond to different testing point positions, and it can be ensured that the testing device completes detection of different point positions of the camera modules; in addition, the structure is simple, operation is rapid and convenient, and the working efficiency can be correspondingly improved.

The invention relates to the technical field of medical rehabilitation treatment, and discloses a self-adaptive functional electrical stimulation system based on bimodal feedback and a control method. The system comprises a main control module, a stimulation output module, an electroneurographic signal detection module, a biological impedance test module and a safety isolation module. The main control module comprises a safety current determination unit, a stimulation control unit and a dynamic calibration unit which are respectively used for determining an individualized initial safety current based on neural action potential feedback, controlling treatment stimulation output and dynamically calibrating a safety current upper limit according to biological impedance change before and after stimulation. According to the invention, through bimodal feedback of electroneurographic signals and biological impedance, individualized calibration and real-time dynamic optimization of stimulation parameters are realized, and the problem that the treatment effect and safety are difficult to guarantee due to the fact that traditional functional electrical stimulation depends on experience setting and lacks physiological feedback is solved; and the accuracy, safety and adaptability of rehabilitation treatment are remarkably improved.

A display apparatus and a test method therefor. The display apparatus comprises a display substrate (11), and an integrated circuit (12) and a flexible circuit board (13) separately bound and connected to the display substrate (11). The display substrate (11) comprises multiple first substrate pads (111A) and multiple second substrate pads (111B). The integrated circuit comprises a test signal end and multiple first connection pads (121). The display substrate (11) or the integrated circuit (12) comprises a first switch unit (S1) and a second switch unit (S2). At least two first connection pads (121) are electrically connected to the test signal end by means of the first switch unit (S1), and at least two second substrate pads (111B) are electrically connected to the test signal end by means of the second switch unit (S2). The integrated circuit (12) detects the status of the binding connection between the integrated circuit (12) and the display substrate (11), or between the flexible circuit board (13) and the display substrate (11), by means of controlling the connection and disconnection of the first switch unit (S1) and the second switch unit (S2), respectively, such that an impedance test signal of the test signal end passes through test pathways in which the first switch unit (S1) and the second switch unit (S2) are located.

The invention provides a multi-port coupled cable signal abnormity determination method and a related device, and the method comprises the steps: controlling N signal injection modules to input a coupling sweep frequency signal to a to-be-detected cable through the implementation of the embodiment of the invention; receiving M second signals and M standard reflection coefficients from the cable to be detected; determining M third signals based on the M second signals and the M standard reflection coefficients; and determining a fusion signal spectrum under the frequency fk based on the M third signals, wherein the fusion signal spectrum is used for determining a signal abnormal condition of the to-be-detected cable. Therefore, multi-port coupling and synchronous injection are realized at the head end of the cable, and the excitation energy and the signal-to-noise ratio of the broadband impedance test are remarkably improved through superposition and data fusion of multi-path signal energy, so that high-precision positioning and reliable evaluation of the latent defect of the cable are realized under a complex working condition.

The invention belongs to the technical field of PCB detection, and particularly relates to a PCB deformation compensation method and system and a terminal.The method achieves efficient correction of PCB deformation through a two-point global linear compensation algorithm, and specifically comprises the steps that theoretical coordinates of two alignment points are obtained, and the theoretical distance is calculated; performing alignment through a visual system to obtain a mechanical position containing a probe angle parameter; calculating an actual deformation distance based on a kinematics formula, and determining a deformation proportion; and finally, uniformly compensating all the bonding pad coordinates. According to the method, the overall deformation compensation of the PCB can be completed only through two alignment points, compared with a traditional multi-area compensation method, the process is remarkably simplified, meanwhile, the positioning precision is improved by introducing probe motion parameters, the method can be widely applied to PCB detection equipment such as a flying probe detection machine and an automatic impedance testing machine, and the problem of test deviation caused by PCB deformation is effectively solved.

The invention relates to the technical field of circuit board impedance measurement, and provides a multilayer soft board FA impedance board measurement method, which comprises the following steps: S1, cutting and drilling a base material; s3, target drilling and laser windowing: 1) drilling positioning target holes in four corners of a laminated plate by using an X-ray target drilling machine, and windowing; and S4, impedance testing: carrying out impedance measurement on the exposed FA impedance line by using a time domain reflectometer. According to the technical scheme, the problems that in the existing FPC industry, due to the fact that a dielectric layer of a multi-layer soft board is complex, glue layers and PI layers are stacked repeatedly, and an impedance analog value is often greatly different from an actual value, in general, an impedance FA batch needs to be tried to be made before a formal batch of products is made, and whether the impedance is qualified or not needs to be verified are solved; the problem that the delivery cycle of a formal product is seriously influenced due to the fact that impedance measurement can only be carried out after an outer layer etching circuit is manufactured due to the fact that an impedance product is contained in the inner layer of the multi-layer soft board is solved.

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.

The invention discloses a method and device for preventing short circuit of a proton exchange membrane electrolytic bath, and the method comprises the steps: obtaining the temperature and performance data of each electrolysis cell in a reference group electrolytic bath in an electrolysis process, and constructing a short circuit risk judgment model for judging the short circuit risk of the electrolysis cells based on a correlation analysis method; based on a short-circuit risk judgment model, judging whether the voltage attenuation rate of each small electrolysis chamber in the test group electrolysis bath is within a first preset range or not; if yes, judging that the short-circuit risk of the electrolytic cell of the test group is lower than a threshold; otherwise, carrying out fixed-frequency impedance testing on the corresponding small electrolysis chambers; based on the fixed-frequency impedance test result and a short-circuit risk judgment model, judging whether the resistance of the corresponding small electrolysis chamber is within a second preset range or not; if yes, judging that the short-circuit risk of the electrolytic cell of the test group is lower than a threshold; otherwise, judging that the short-circuit risk of the test group electrolytic cell is higher than a threshold. Whether the electrolysis cell has a short circuit risk or not can be monitored, and safe operation of the whole hydrogen production system is ensured.

This application relates to the field of radio frequency (RF) power supply technology, and discloses a gain calibration method, a dynamic impedance testing method, equipment, and dielectric. The gain calibration method includes: acquiring multiple RF power measurements, where the RF power measurements are the output power measurements of an RF power supply in an open-loop state under multiple load impedance values; performing two-dimensional interpolation fitting in the complex plane of reflection coefficient based on the load impedance values ​​and the RF power measurements to obtain a continuous power distribution; selecting a minimum RF power value in the complex plane of reflection coefficient based on the continuous power distribution to obtain a target minimum RF power value; and calculating the gain of the RF power supply based on the target minimum RF power value, the load impedance value corresponding to the target minimum RF power value, and a preset characteristic impedance value. The embodiments of this application can improve the accuracy of RF power supply gain calibration and reduce the impact of environmental noise and small impedance fluctuations.

The utility model relates to the technical field of electrochemical impedance testing, in particular to an electrochemical impedance testing device and a testing board, the electrochemical impedance testing device comprises an electrochemical workstation, a working electrode, a feedback electrode, an auxiliary electrode, a reference electrode and two duplex banana plugs, and each duplex banana plug is provided with two electrodes. The two duplex banana plugs comprise a first duplex banana plug and a second duplex banana plug, one ends of the working electrode and the feedback electrode are respectively connected with two electrodes of the first duplex banana plug, the other ends of the working electrode and the feedback electrode are connected with the electrochemical workstation, one ends of the auxiliary electrode and the reference electrode are respectively connected with two electrodes of the second duplex banana plug, and the other ends of the auxiliary electrode and the reference electrode are respectively connected with the electrochemical workstation. The other end of the first duplex banana plug is connected with an electrochemical workstation, each electrode of the first duplex banana plug is connected with a first lead, and each electrode of the second duplex banana plug is connected with a second lead. According to the utility model, the influence of contact resistance is eliminated, and the accuracy of impedance test results is improved.

The utility model relates to a proton exchange membrane impedance test fixture, which comprises an upper cover plate and a lower cover plate, a positioning concave platform is formed on the lower end face of the upper cover plate, an upper template with a hollow middle part is inserted in the positioning concave platform, the lower end face of the upper template is abutted against a lower template, and the lower template is connected with the lower cover plate. Positioning holes are formed in the four corners of the upper die plate and the four corners of the lower die plate and used for containing positioning pins. The middle part of the lower cover plate is provided with a hollow test part corresponding to the surface of the proton exchange membrane; the periphery of the hollow-out testing part is provided with a positioning assembly in a vertically upward extending manner. The positioning assembly is used for abutting against and fixing the upper cover plate. The test surface of the proton exchange membrane is changed to be downward, so that the problem of water accumulation on the test surface of the proton exchange membrane is avoided, and the accuracy and the stability of impedance data of the proton exchange membrane are ensured.

The embodiment of the invention provides a direct-current impedance testing method of a secondary battery, and belongs to the technical field of battery manufacturing, and the method provided by the embodiment of the invention comprises the following steps: constructing an electrochemical model of the secondary battery; according to the electrochemical model, simulating and calculating solid-phase potential, liquid-phase potential, active ion concentration and interface current density distribution of the secondary battery; according to the electrochemical model, the solid phase potential, the liquid phase potential, the active ion concentration and the interface current density distribution, the direct current impedance of a target assembly in the secondary battery is determined, and the target assembly comprises at least one of a positive plate, a negative plate and a diaphragm. Through the method provided by the embodiment of the invention, the problem that the direct current impedance of the secondary battery cannot be accurately decomposed in the existing direct current impedance decomposition mode can be solved.

This application discloses a method for calculating the vibration isolation of ship vibration isolation devices based on isolator type spectrum data, relating to the field of ship vibration isolation design. The method includes: acquiring the type spectrum data and impedance test data of the target isolator; determining the stiffness and damping parameters of the target isolator based on the type spectrum data and impedance test data; constructing a finite element model of the ship vibration isolation device; inputting the stiffness and damping parameters of the target isolator into the finite element model for calculation, and obtaining the vibration isolation calculation results of the target isolator. This method can efficiently utilize isolator type spectrum data to conduct vibration isolation calculation and evaluation of ship vibration isolation devices during the ship design phase, avoiding resonance between the natural frequency of the vibration isolation device and the excitation frequency of the equipment, and improving the vibration isolation effect.

The present application discloses an electrochemical impedance test equivalent circuit and fitting method, which relates to the field of battery technology and can accurately fit the electrochemical impedance spectrum inside the battery, thereby accurately reflecting the working state of the battery. An electrochemical impedance test equivalent circuit includes: an electrolyte membrane resistor; at least two-order equivalent circuits connected in series with the electrolyte membrane resistor, each of the at least two-order equivalent circuits is connected in series, and each of the equivalent circuits includes linear elements and nonlinear elements.

The application discloses a kind of impedance test file generation methods, comprising the following steps: S1: Genesis software retrieves ERP file and TGZ file from database;The impedance information of PCB board is contained in the ERP file, and the layer information of PCB board is contained in the TGZ file;S2: Genesis software identifies ground point according to TGZ file;S3: Genesis software identifies single-ended impedance line and differential impedance line according to ERP file, and calculates its length;S4: the coordinates of the single-ended impedance line and the end point coordinate of ground point in the preset range are positioned, and the two end point coordinates of differential impedance line in the preset range are positioned;Single-ended impedance line, differential impedance line and corresponding coordinates are formed CSV file output;S5: CSV file is decoded as DIF file and is output.The impedance test file generation method provided by the application can automatically output ground point and impedance line, and can output all data at a time, to ensure that impedance test file can be quickly and effectively generated.

The invention discloses a lithium ion battery charging and discharging process dynamic change characterization method based on a harmonic excitation online impedance test, and is suitable for dynamic monitoring of a lithium ion battery in an operation process. The lithium ion battery to be tested is connected with a charging and discharging device, and the charging and discharging device is used for carrying out constant-current charging and discharging on the battery; acquiring time sequence data of current and voltage, respectively performing time-frequency domain analysis on the acquired current and voltage data, and calculating to obtain impedance data in a specific frequency range; purifying the impedance data; time relaxation distribution peak information of different processes is extracted through relaxation time distribution; time relaxation distribution peak value information in the whole charging and discharging process is repeatedly collected, and the change trend of the peak value information along with the change of the charge state in the whole charging and discharging process is formed; and dynamic change monitoring is realized by observing changes. The method can be used for detecting the dynamic change of the lithium ion battery in the charging and discharging process, and has very high accuracy and timeliness.