1298 results about "Excitation current" patented technology

The invention relates to the technical field of electromagnetic flowmeter calibration, and discloses an electromagnetic flowmeter online calibration system and an acquisition and storage device. The system comprises a signal acquisition module, a data processing module, an error analysis module, a parameter calibration module and a real-time monitoring module. The signal acquisition module captures an original signal waveform through a multi-channel sensor array and acquires flow signal data to generate a state set; the data processing module uses a wavelet packet transformation and adaptive filtering combined algorithm to reduce noise and extract features; the error analysis module constructs a dynamic time warping error matching model to obtain an error correction coefficient; the parameter calibration module adopts a fuzzy control and proportional integral differential composite strategy, and adjusts excitation current and electrode sensitivity according to an error correction coefficient; the real-time monitoring module establishes a rolling optimization model with time-varying constraints, and generates a calibration instruction in combination with signal stability and power consumption limitation. According to the system, online accurate calibration of the electromagnetic flowmeter is realized, and the measurement accuracy and the equipment operation stability are improved.

The invention provides a generator excitation regulation and control optimization system based on model prediction, and relates to the technical field of data processing, and the system comprises a data acquisition module which is used for collecting the operation parameters of a generator; the state estimation module is used for calculating a state variable of the generator excitation system and constructing a state space model of the generator excitation system; the model prediction control module is used for calculating excitation current prediction values at multiple moments in the future by adopting a rolling horizon optimization method, and performing dynamic correction based on a prediction error correction mechanism; the optimization calculation module is used for constructing a target optimization function which comprises a generator voltage stability target item and an excitation current adjustment smoothness target item, and calculating an optimal excitation current adjustment amount by adopting a constraint optimization method; the excitation adjusting module is used for controlling a generator excitation system so as to adjust excitation current; according to the invention, the autonomy and accuracy of the generator excitation regulation and control optimization system are improved.

The present invention discloses a method and system for intelligent control of generator output, which relates to the field of intelligent power control, including collecting generator operation data, sampling the generator output waveform, and extracting harmonic distortion data using fast Fourier transform; based on the generator operation data, predicting future changes through a long short-term memory network model to obtain load change trends; according to the load change trend, combined with harmonic distortion data, identifying the correlation between harmonic sources and loads, and generating a harmonic compensation scheme; based on the harmonic compensation scheme and the load change trend, generating a dual control strategy to adjust the generator operating parameters. The present invention generates a dual control strategy by combining the harmonic compensation scheme with the load change trend, thereby realizing dynamic adjustment of the generator output power, reactive power, excitation current and speed, and optimizing the generator operating parameters and energy efficiency.

The invention provides an ultra-short beam homogenization transmission line system and method based on a four-eight-pole composite magnet. The system comprises the four-eight-pole composite magnet, a system, a linear beam homogenization structure, a bent beam homogenization structure and secondary iron used for a beam homogenization transmission line. The system further comprises an ultra-short linear beam homogenization transport line, an ultra-short bent beam homogenization transport line, an ultra-short linear bent composite beam homogenization transport line and an ultra-short symmetrical bent beam homogenization transport line based on the homogenization structure and / or the dipolar iron. The method comprises an exciting current debugging method based on the four-pole and eight-pole composite iron and a linear type and bending type beam debugging method. According to the invention, the problem that the maximum enveloping part on the transmission line is occupied and the effect of octopole iron cannot be fully exerted is solved; the problems that the beam envelope of the position where the octopole iron is located is small, and the requirement for the field intensity of the octopole magnet is high are solved. The problem that the civil engineering shielded around the transmission line is more expensive because the transmission line is too long is solved.

The invention discloses a pulsed eddy current detection method and system for a thermal power pipeline with a coating layer, and relates to the technical field of pulsed eddy current nondestructive detection.The pulsed eddy current detection method comprises the steps that pulsed eddy current detection simulation and experiment are conducted under the condition of a three-dimensional simulation model and a test piece, and excitation current waveform, amplitude and frequency parameters are determined; an induced voltage signal is collected, peak values, time points and attenuation characteristics are extracted, the corresponding relation between the wall thickness, the coating layer thickness and the welding seam structure and detection signals is constructed, a parameterized database is constructed, and temperature correction is completed; and optimizing a sensor structure and a signal acquisition scheme according to a parameterized database, obtaining detection data in a pipeline operation state, completing two-dimensional imaging of wall thickness distribution and welding seam positioning, and forming detection information covering a straight pipe, an elbow and a welding seam area. According to the method, wall thickness detection and welding seam positioning of the thermal power pipeline under the conditions of a thick wall and a thick coating layer are achieved through the full-process design of test piece modeling, simulation experiment and imaging collection.

An apparatus, method and apparatus for calculating an electrochemical impedance spectrum of a battery pack comprising n battery cells connected in series wherein the apparatus comprises: n current generating circuits, the k battery unit in the n battery units and the k current generation circuit in the n current generation circuits form a k series loop and are configured to generate k excitation current in the k series loop, the k excitation current has a first frequency, and k is smaller than or equal to n; a voltage detection circuit configured to detect a voltage of each of the n battery cells; and an electrochemical impedance spectroscopy control and calculator configured to calculate an impedance of a kth battery cell for the kth excitation current based on the kth excitation current and the detected voltage of the kth battery cell, the impedance including a real part and an imaginary part.

The invention relates to a lithium ion battery thermal runaway early warning method and device and a medium, and the method comprises the steps: setting an AC excitation power supply parameter, and outputting a sine excitation current with a preset frequency and amplitude; injecting the polymer into a single battery through a four-probe method; synchronously acquiring an injection current signal and a response voltage signal; through fast Fourier transform analysis, the amplitude and the phase of a signal fundamental frequency component are extracted; and calculating the electrochemical impedance under the frequency. And in combination with an electrochemical impedance-thermal runaway precursor mapping database established by a pre-experiment, converting the impedance value into a corresponding thermal runaway risk level, and outputting corresponding early warning information. According to the method, lithium dendrite growth and internal micro short circuit signs can be captured in advance, and the early warning time efficiency is remarkably improved compared with traditional voltage / temperature monitoring.

The invention provides a cell fault early warning method and system based on dynamic impedance fitting, and the method comprises the steps: carrying out the impedance test of a target battery, obtaining an impedance value at an initial moment, and charging the target battery; performing impedance recording on the target battery at each time point through the excitation current with the preset frequency to obtain a real-time impedance observation value; constructing an exponential decay model and performing impedance fitting prediction on the real-time impedance observation value at each time point to obtain a real-time impedance prediction value; and carrying out residual error fitting and deviation analysis on the real-time impedance observation value and the real-time impedance prediction value to obtain battery abnormal change monitoring data, and sending out early warning when the target battery cell has a fault. The problem that in the prior art, in the battery charging and discharging process, the battery impedance change cannot be detected in real time, and the battery fault cannot be early warned in time, so that the safety of the battery cell is poor is solved. According to the invention, the impedance abnormal change time can be fed back in time and early warning can be made, so that the safety of the battery cell is improved.

The invention discloses a phase modifier unit state monitoring and load control method and system for reactive power compensation of a power grid, belongs to the technical field of automatic control of power systems, and mainly solves the problem that service life loss is aggravated or a control target is single due to the fact that the health state of equipment is not fully considered when an existing phase modifier unit responds to reactive power requirements of the power grid. The method comprises the following steps of: calculating reactive vacancy and extracting vibration frequency band energy characteristics by acquiring voltage and frequency of a power grid as well as vibration, temperature and exciting current signals of a unit in real time, and constructing a health state index HSI in combination with self-adaptive wavelet basis selection; taking minimum equipment life loss and optimal power grid voltage stability as multiple objectives, dynamically generating a load control instruction by adopting a particle swarm algorithm, realizing weight adaptive adjustment based on HSI, and introducing an online life loss model as a constraint condition; finally, reactive power output is adjusted through an excitation system, and cooperative control of power grid stability and equipment life extension is achieved.

The invention discloses a method and a system for compensating different-frequency current errors of a low-voltage current transformer, and belongs to the technical field of error measurement of electric energy metering equipment. The method comprises the following steps: measuring the magnetic conductivity of a low-voltage current transformer CT iron core under power frequency and different frequency current, and calculating to obtain low-voltage CT equivalent circuit excitation impedance parameters under the magnetic conductivity corresponding to different frequency circuits; measuring to obtain the direct current resistance of the low-voltage CT secondary winding, and calculating to obtain the excitation current value under each frequency calibration range point based on the direct current resistance; and calculating a current error value of the measuring range point under each frequency based on the excitation current value, calculating a pilot frequency error compensation coefficient of the measuring range point under each frequency based on the current error value, and compensating the abnormal current error of the low-voltage CT by using the pilot frequency error compensation coefficient. According to the invention, large-scale and high-efficiency utilization of pilot frequency current is facilitated to carry out low-voltage CT live calibration error verification, and the metering performance of the low-voltage CT in the commissioning process is accurately judged.

The invention discloses an exciting current adjusting method for four-pole / eight-pole composite iron. The exciting current adjusting method comprises the following steps: establishing a two-dimensional data comparison table of coil currents of four-pole iron and eight-pole iron; performing experimental measurement to obtain a quadrupole field magnetic field gradient three-dimensional curved surface sample database and an octupole field magnetic field gradient three-dimensional curved surface sample database; performing two-dimensional interpolation on the magnetic field gradient three-dimensional curved surface sample database by using a cubic spline function; a quadrupole field magnetic field gradient plane and an octupole field magnetic field gradient plane are selected and intersect with the quadrupole field magnetic field gradient three-dimensional curved surface sample database curved surface and the octupole field magnetic field gradient three-dimensional curved surface sample database curved surface respectively, and current curves meeting the quadrupole field gradient and the octupole field gradient are obtained; and obtaining an intersection point of the two curves, and using the intersection point as a solution of the compound iron exciting current. According to the invention, based on magnetic field measurement data under a few groups of excitation currents, a large amount of excitation current debugging time is saved, and accurate adjustment of the magnetic field gradient of the composite multi-pole magnet can be realized.

The invention belongs to the related technical field of fuel cells, and particularly relates to a fuel cell impedance spectroscopy rapid measurement system and method, the system is divided into an excitation current injection part, a data acquisition part and an upper computer, the upper computer adopts a DIBS signal with an excellent peak value inhibition capability and a flexible amplitude-frequency design capability as test excitation, and the test excitation part is connected with the data acquisition part; an electronic load is used as an excitation source. The upper computer can control the electronic load to generate a current excitation waveform used for impedance testing based on a DIBS signal, the electronic load injects excitation current into output current of a tested galvanic pile, the upper computer can also read sampling data of the data acquisition part, fast Fourier transform is carried out on the acquired excitation current and response voltage data, and the impedance of the tested galvanic pile is tested. And obtaining an electrochemical impedance spectrum. According to the method, the impedance measurement efficiency is improved, the hardware structure is simple, the method has a good field application prospect, a measured object can be expanded to other electrochemical systems including an electrolytic tank, and the method has good expansibility.

The invention discloses an electrochemical impedance spectroscopy detection method and system and related equipment. The electrochemical impedance spectroscopy detection system comprises: a battery pack comprising a plurality of cells; the battery cell management module is connected with the plurality of battery cells and is used for acquiring response voltage of the battery pack and performing discrete Fourier transform on the excitation current and the response voltage to obtain an electrochemical impedance spectrum of the battery pack under the target excitation frequency; the battery management module is connected with the excitation source module and used for sending the target excitation frequency to the excitation source module; and the excitation source module is used for generating excitation current according to the target excitation frequency sent by the battery management module.

The present invention provides a topology, method and system for bi-directional power conversion of excitation power supply for power battery testing, wherein the topology comprises a three-phase PWM (pulse width modulation) converter, a high-frequency isolation three-level LLC (logical link control) resonant converter and a DC-DC (direct current) converter forming a topology structure for a three-stage power conversion; an input end of the three-phase PWM converter is connected to a power grid side; the high-frequency isolation three-level LLC resonant converter is connected between the three-phase PWM converter and the DC-DC converter in series and is configured for realizing bi-directional DC voltage conversion and isolation, and to raise a busbar voltage between the high-frequency isolation three-level LLC resonant converter and the DC-DC converter; and, the DC-DC converter is configured to generate charging and discharging excitation currents for a power battery testing.

The invention discloses an electromagnetic valve fault diagnosis method and system, a storage medium and a program product, and relates to the field of magnetic variable measurement, in the method, an alternating current signal of a first preset frequency is applied to an electromagnetic valve coil, an inherent working current signal is collected, and a mixed current signal is generated; separating the mixed current signal to obtain a harmonic component; determining a target frequency based on the harmonic component; generating an excitation current signal of a second preset frequency according to the target frequency; applying an excitation current signal to a solenoid valve coil, and collecting a resonance current signal generated by the solenoid valve under the excitation current signal; determining the resonance characteristic of the internal mechanical structure of the electromagnetic valve according to the amplitude and the phase characteristic of the resonance current signal; and identifying the fault type of the electromagnetic valve based on the change trend of the resonance characteristic along with time. The method is used for improving the accuracy of identifying the evolution trend of the fault features, further preventing possible faults of the electromagnetic valve in advance, and improving the safety of the electromagnetic valve in the using process.

The invention relates to the technical field of power system fault monitoring, and discloses a measurement switch fault identification and early warning system, which comprises a signal acquisition unit, a feature analysis unit, a fault judgment unit and an early warning trigger unit. The signal acquisition unit acquires a potential fluctuation sequence and an exciting current pulse sequence through a contact voltage sensor and a coil current transformer; the feature analysis unit extracts time-frequency domain and statistical domain feature groups by means of wavelet transform and moment function analysis; the fault judgment unit generates a fault judgment vector by adopting kernel principal component analysis fusion features; and the early warning triggering unit triggers four-level early warning by using dynamically updated grading threshold values (including historical reference values and online dynamic values). According to the system, through multi-modal feature fusion, dynamic threshold adjustment and a grading early warning strategy, accurate identification and grading early warning of measurement switch faults are achieved, the fault identification accuracy and early warning timeliness are improved, and the system is suitable for the field of electric power and industrial automation.

The invention relates to the technical field of linear motor control, and discloses a micro-motion phase searching method and system of a linear motor system, and a storage medium, and the method comprises the following steps: S1, injecting a D-axis excitation current to a motor for open-loop motion control for current excitation, and enabling an initial given electrical angle m0 to be equal to 180 degrees; s2, after current excitation is stopped, judging according to a grating ruler variation degree D: firstly, judging whether Dlt is met or not; if theta min / N or e-f is smaller than or equal to theta min, current excitation is repeatedly carried out at different given electrical angles mj until D is larger than or equal to theta min / N and e-fgt is met; [theta] min; if not, when D is greater than or equal to thetamin / N and e-fgt; when Dt is equal to theta < min >, current excitation generates displacement, and iterative phase searching is carried out until Dlt is met; theta min / N or e-f is less than or equal to Theta min. According to the scheme, in the whole positioning process, the current is small, the motion displacement is small, no extra sensor is needed, the problems of structural interference and impact possibly caused by the conditions of long displacement and high speed are effectively avoided, and the judgment logic is simple.

The invention relates to the field of electrical impedance detection, in particular to a three-dimensional electrical impedance distribution monitoring method and system, and the method comprises the steps: detecting and analyzing the physical attribute data of all target points on an object, and dividing all target points into a first-choice applied excitation point set and an alternative applied excitation point set; based on the spatial distribution state of all target points subordinate to the preferred applied excitation point set and the contact state between all the target points and the electrode, adjusting the preferred applied excitation point set by using the alternative applied excitation point set; and determining electrical impedance information of all target points based on the excitation current signals applied to all the target points subordinate to the preferred applied excitation point set and the generated response voltage signals, integrating the electrical impedance information to generate a three-dimensional electrical impedance distribution image of the object, and determining an electrical impedance abnormal region of the object. According to the invention, electrical impedance detection in a global range can be carried out on an object with an irregular three-dimensional shape and anisotropic organization structure state, and the three-dimensional electrical impedance distribution condition of the object is obtained.

The invention discloses a synchronous generator excitation method based on mathematical modeling and gain scheduling, and relates to the technical field of synchronous generator control, and the method comprises the steps: building a synchronous generator global dynamic mathematical model comprising the electromagnetic dynamic characteristics of a stator winding, a rotor winding and a damping winding through a modeling module; a discretization simulation platform is constructed in a Matlab / Simulink environment by utilizing a simulation module, model parameters are corrected, dynamic adjustment is realized through a gain scheduling excitation controller, an automatic voltage regulator (AVR) adopts PID (Proportion Integration Differentiation) control and comprises a voltage deviation integral separation strategy, and a power system stabilizer (PSS) dynamically adjusts parameters of a lead-lag compensator based on active power. According to the method, the deviation between a model and an actual system can be reduced by more than 30%, the electromechanical oscillation damping ratio within the rated power range of 10%-150% is increased by 25%-40%, the harmonic content of exciting current is reduced to be lower than 5%, the stability of an electric power system and the electric energy quality are remarkably improved, the engineering practicability is high, and the method is easy to transform and upgrade on an existing synchronous generator.

The invention discloses a monitoring method and system and a related device, which are applied to first electronic equipment, the first electronic equipment is provided with a first circuit, and the first circuit comprises a first electrode, a second electrode, a third electrode, a fourth electrode, an excitation current generation unit and a voltage measurement unit; receiving and responding to a first instruction, and determining that the first electrode and the second electrode are in good contact with skin through a first circuit; first information is determined through the first circuit, the first electrode makes contact with a first position of the user skin, the second electrode makes contact with a second position of the user skin, and the first position and the second position are located at the two ends of the thoracic cavity tissue respectively; and outputting first information, wherein the first information comprises one or more of the following items: cardiac output, stroke output, heart rate, ejection fraction and cardiac function judgment result. Therefore, the heart function condition of the user can be monitored in real time, and the user can conveniently monitor anytime and anywhere.

The invention discloses a magnetic adjustment water lubricated bearing and a bearing support control method, which are applied to a large ship propulsion shaft system, and comprise a bearing shell, an electromagnetic excitation module, a batten, a sensor module, a power supply driving module and a control system, a plurality of mounting grooves are formed in the bearing shell; an electromagnetic excitation module is arranged in each mounting groove and generates a variable magnetic field with set intensity; a plurality of magnetically soft alloy segments are arranged on the batten, the magnetically soft alloy segments correspond to the electromagnetic excitation modules one to one, and a magnetic field acts on the magnetically soft alloy segments to generate electromagnetic attraction force; the control system independently controls the excitation current of each electromagnetic excitation module according to data of the sensor module, and generates magnetic fields with different intensities to act on soft magnetic alloy areas at corresponding positions, so that precise control of local supporting rigidity and lubricating gaps of the water-lubricated bearing is realized, unbalance loading and abnormal wear risks are effectively reduced, and the service life of the water-lubricated bearing is prolonged. And the adaptive capacity of the bearing under low-speed heavy load and dynamic disturbance is improved.

The invention belongs to the technical field of power system operation and motors, and particularly relates to an energy storage type phase modifier control method which comprises the steps that a rotating shaft of a double-fed motor is connected with a flywheel to serve as an energy storage type phase modifier; the rotor winding is connected to a power grid through an excitation system and a transformer in sequence, and the excitation system is electrically connected by a reactor, a back-to-back converter and a filter in sequence; the stator winding is directly connected to a power grid; the control system decouples reactive power and active power, vector control is carried out on exciting current to absorb or release power, and reactive power-voltage support and active power-frequency support of the power grid are completed. The method overcomes the defects that a traditional direct-current excitation phase modulation mode can only modulate phase and cannot modulate frequency, or is cumbersome and slow in response. The system can meet the requirement of wide-range variable-speed operation, quickly store / release a large amount of rotor kinetic energy, inhibit the voltage and frequency fluctuation of a power grid, and is especially suitable for stations with high new energy occupation ratio. The invention also provides a non-transitory readable recording medium storing the program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

The embodiment of the invention discloses a transformer invisible fault diagnosis method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring voltage and current recording data of a transformer measured on line; performing influence factor elimination operation on the voltage and current recording data, specifically comprising the following steps of: eliminating a higher harmonic component, a direct current component and an attenuation direct current component by adopting a full-wave differential Fourier algorithm to obtain a fundamental wave voltage and a fundamental wave current; when the elliptical orbit is calculated, normalization processing is carried out on different loads; eliminating the influence of abnormal numerical values by adopting a Gaussian regression algorithm; constructing a voltage difference and current elliptic track by using a transformer port relational expression compensated by the exciting current; correcting the elliptical trajectory by using the primary side voltage data, the secondary side voltage data and the primary side current data of the two groups of transformers measured within the sampling time; and after the operation of eliminating the influence factors, realizing the recognition and diagnosis of the invisible fault of the transformer through Lissajous ellipse fitting, characteristic quantity extraction and an artificial intelligence inversion algorithm.

The utility model relates to the field of resonance eliminators, and discloses a protection element and a current limiting type resonance eliminator, the protection element comprises at least two groups of protection units, the two adjacent groups of protection units are connected in series, and each protection unit comprises a protection module; the current-limiting resonance eliminator based on the current-sensitive resistor made of the current-sensitive material is connected in series between the PT neutral point and the ground. Under the normal operation condition, the current-limiting resonance eliminator is in a low-resistance state, and system parameters and PT performance are not affected; when excitation energy is generated due to a system fault, the current-limiting resonance eliminator suddenly changes into a high resistance state, quickly absorbs resonance energy, destroys resonance parameters, suppresses PT excitation current below 200mA, and ensures that a voltage transformer is unsaturated and a PT fuse is not fused; and a built-in current sensor is connected, so that the running state of the current-limiting resonance eliminator can be monitored in real time.

The electric pulse deicing control method for the wind turbine blade comprises the following steps that S1, deicing points are arranged on the windward side of the wind turbine blade, each deicing point is provided with an electric pulse deicing device, and each electric pulse deicing device comprises a magnet exciting coil and a skin, the skin is fixed on the surface of the fan blade at a deicing point, the excitation coil is completely covered with the skin, and the electric pulse deicing device is controlled by a deicing control module; wherein the deicing control module adjusts the magnitude of excitation current input to the excitation coil by adjusting the duty ratio of a PWM control signal; s2, environment parameters of the environment where the wind turbine blade is located and icing thickness detection information of the wind turbine blade are obtained, the environment parameters are input into a deicing control module, and the deicing control module determines the duty ratio of a PWM control signal according to the corresponding relation between the environment parameters and the icing thickness and the duty ratio of the PWM control signal; and S3, the deicing control module works according to the determined duty ratio of the PWM control signal, and outputs a corresponding excitation current to the excitation coil.

The invention provides a magnetization capacitance coupling plasma discharge system and a calculation model and a calculation method thereof in the technical field of plasmas, the plasma discharge system comprises a vertical cylindrical hollow closed cavity, and the cavity is filled with argon; a circular driving electrode is coaxially arranged at the top of the cavity, and a circular grounding electrode is coaxially arranged at the bottom of the cavity; three electromagnetic coils are coaxially arranged around the periphery of the chamber at intervals from top to bottom; a radio frequency voltage is applied between the grounding electrode and the driving electrode, so that argon in the chamber can be subjected to discharge ionization to generate plasma; and excitation current is introduced into the three electromagnetic coils for generating an external magnetic field in the chamber, so that the density of plasma generated by argon ionization in the chamber can be improved. The magnetization capacitance coupling plasma discharge system provided by the invention can optimize the property of the plasma, improve the density and performance of the plasma, and better provide a basis for the improvement of a plasma process technology.

An electric drive system includes an electric machine having a stator assembly and a rotor assembly. The stator assembly has a plurality of multi-phase stator windings, including a first stator winding and a second stator winding. A first inverter is adapted to feed the first stator winding. A second inverter is adapted to feed the second stator winding. The rotor assembly includes rotor windings having a single phase. A controller is configured to selectively command excitation of the rotor windings with a pulsed field current such that a direct-axis (d-axis) stator flux linkage is generated. A d-axis stator voltage is induced in the first stator winding and the second stator winding by the d-axis stator flux linkage. Pulsed power transfer is enabled through interaction of the d-axis stator voltage and respective d-axis winding currents in the first stator winding and the second stator winding.

The invention relates to a method. The invention discloses an ATE-based method for batch detection of pseudo soldering and sealing-off of chip packaging bonding, and belongs to the technical field of semiconductors. The method comprises the following steps: aiming at packaged and bonded chips, providing excitation current for each chip to be tested through an ATE test machine, and conducting an ESD (Electro-Static Discharge) diode connected with each pin of the chip; detecting the voltage drop between each pin and the pin GND; and calculating the equivalent resistance to determine whether pseudo soldering or unsoldering exists. The detection method has high practicability, is simple to operate, is very suitable for large-scale application and popularization, and has a certain promotion effect on improvement of a chip packaging test technology, improvement of chip performance reliability and chip packaging inspection.

The invention discloses a battery electrochemical impedance spectroscopy detection method and device, and relates to the field of battery state detection. The method comprises the steps that a to-be-tested battery is connected with a test system in a Kelvin mode; determining a specific form of a sampling function according to the low-frequency test frequency band and the internal resistance of the to-be-tested battery so as to obtain a sampling signal; testing the high frequency band of the battery to be tested by adopting a sine frequency sweep excitation method to obtain an impedance spectrum of the high frequency band; controlling the test system to perform excitation test on the low-frequency band of the to-be-tested battery according to the designed sampling signal to obtain an excitation current signal and a response voltage signal of the to-be-tested battery in the low-frequency band, and performing Fourier transform to obtain an impedance spectrum of the low-frequency band; and splicing the impedance spectrum of the high frequency band and the impedance spectrum of the low frequency band to form a complete electrochemical impedance spectrum of the battery to be detected. No matter whether standing test or online measurement is carried out, the test efficiency of the electrochemical impedance spectroscopy of the battery can be remarkably improved, and the test precision can be ensured.

The invention provides a sampling modulation excitation signal phase acquisition device for an alternating current impedance method in the technical field of lithium battery detection. Comprising an excitation current AC signal synchronous extraction module, a signal in-phase and anti-phase switching control module, a phase adjustment module, a signal high gain and amplitude limiting module and a phase adjustment signal output module. The excitation current AC signal synchronous extraction module, the signal in-phase and anti-phase switching control module, the phase adjustment module, the signal high gain and amplitude limiting module and the phase adjustment signal output module are connected in sequence. The method has the advantage that the alternating-current impedance test precision is greatly improved.