86 results about "Ac impedance" patented technology

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 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.

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 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 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.

The invention relates to the technical field of solid oxide electrolytic cell hydrogen production, and particularly discloses a control system and method of SOEC equipment for producing hydrogen by electrolyzing water. The system comprises a multi-frequency impedance acquisition unit and a dynamic interval matching and cooperation controller. The method is characterized by comprising the following steps of: synchronously acquiring alternating-current impedance parameters of different frequency bands for representing an electrolyte body phase state and an electrode interface state; dynamically determining an optimized operation interval in a multi-dimensional impedance state space according to the real-time direct-current working state of the electric pile; a cooperative control instruction is generated by comparing the relative positions of the impedance parameter and the dynamic interval, and meanwhile, a direct-current power supply, a heating device and a gas supply device are adjusted according to differential weights to drive the state of the galvanic pile to enter and be kept in the target interval. According to the method, the internal comprehensive state of the electric pile is directly reflected by using the impedance parameter, global and rapid adaptive cooperative control is realized, and the operation efficiency, stability and durability of the SOEC system can be improved.

An impurity detection support device includes: a pipe; a pair of electrodes; a power supply unit that applies an AC voltage with a frequency fixed at a predetermined operating frequency or superimposes an AC current with a frequency fixed at the operating frequency between the pair of electrodes; a measurement unit that measures a current or a voltage generated between the pair of electrodes; and a calculation unit that calculates a resistance of the liquid under test using a measurement result of the measurement unit. The operating frequency is determined based on a resistance of the liquid under test or a resistance of a reference solution not containing impurities measured by AC impedance method.

An estimation device 55 estimates an internal state of a cell 61 on the basis of an AC impedance characteristic of a diffusion region of the cell 61, the AC impedance characteristic being obtained from a response made while an AC signal is applied to the cell 61 via a power line L for DC charging / discharging purposes.

The invention relates to the technical field of generators, in particular to a generator rotor alternating current impedance testing device and method.The device comprises a box body and an intelligent panel, and the intelligent panel comprises a power supply used for supplying power to the generator rotor alternating current impedance testing device; the power supply output end is used for providing working voltage; the switch assembly is used for controlling the working state of the device. The display assembly is used for displaying AC impedance test data; the voltage regulating assembly is used for regulating the current output voltage; the box body comprises a current acquisition assembly used for acquiring a current signal; the voltage acquisition assembly is used for acquiring a voltage signal; the isolation voltage regulation assembly is used for providing an adjustable alternating current power supply; and the processing assembly is used for calculating AC impedance test data according to the collected current signal and voltage signal. Therefore, the problems that equipment is heavy, wiring is tedious, operation is not safe and multi-person cooperation is needed in a traditional generator rotor alternating current impedance testing method are solved, and intelligent, portable and integrated generator rotor alternating current impedance testing is achieved.

The invention relates to a battery management apparatus, a battery management method, and a control program product. A battery management device according to the present disclosure includes: a temperature detection unit configured to detect a temperature of a lithium ion secondary battery; a high-frequency signal supply unit configured to supply a high-frequency signal of 0.1 MHz or more to the lithium ion secondary battery; an impedance detection unit configured to detect a value of a real part of AC impedance from the lithium ion secondary battery to which the high-frequency signal has been supplied; a calculation unit configured to calculate an amount of Li deposition in the lithium ion secondary battery from a value of a real part of the detected AC impedance; and a control unit configured to control an allowable charging power of the lithium ion secondary battery and control an upper limit temperature of the lithium ion secondary battery based on the calculated Li deposition amount in the lithium ion secondary battery.

The invention discloses a method for rapidly screening the high-temperature stability of a ternary layered positive electrode material of a lithium battery, and belongs to the technical field of material detection. The method provided by the invention comprises the following steps: preparing a ternary layered positive electrode material into a positive electrode, and matching with a negative electrode to assemble a battery; analyzing the alternating current impedance of the battery placed at high temperature for different time, and calculating to obtain an impedance change rate; observing the thickness of the SEI film on the surface of the ternary layered positive electrode material; speculating the high-temperature stability of the ternary layered positive electrode material according to the impedance change rate and the SEI film thickness change; and the ternary layered positive electrode material with small impedance change rate and small SEI film thickness change has good high-temperature stability. The method provided by the invention is stable and reliable, can evaluate the high-temperature stability of the ternary layered positive electrode material in a short time and screen out a high-quality material, and is simple, economical, rapid, efficient and easy to popularize and use.

The invention provides a measuring circuit and a measuring system for alternating-current impedance of a battery cell, and the measuring circuit comprises a low-pass filtering unit which receives a digital excitation signal and carries out the low-pass filtering of the digital excitation signal; the voltage and current conversion unit is connected to the output end of the low-pass filtering unit, converts the voltage signal output by the low-pass filtering unit into a current signal and applies the current signal to the two ends of the battery cell; the high-pass filtering unit is connected to the two ends of the battery cell and is used for filtering a direct current part of a voltage signal acquired at the two ends of the battery cell and retaining an alternating current part; and the signal processing unit is connected to the output end of the high-pass filtering unit and is used for converting an output signal of the high-pass filtering unit into a digital signal and calculating the alternating-current impedance of the battery cell. The measuring circuit and the measuring system for the alternating current impedance of the battery cell are simple in circuit structure and high in accuracy.

To provide a method for detecting changes in the state of the electrolyte contained in a lithium-ion battery without damaging the lithium-ion battery. [Solution] A method for detecting changes in the state of the electrolyte contained in a lithium-ion battery, which detects changes in the state of the electrolyte contained in the lithium-ion battery based on the amount of change dZ of the ZF curve obtained by plotting the actual axial resistance Z, which is obtained by the AC impedance method of the lithium-ion battery, against the voltage frequency F, and the resulting change in the state of the electrolyte contained in the lithium-ion battery.

The utility model discloses a transformer winding structure, which relates to the technical field of transformers, and comprises a magnetic core, a main winding and an auxiliary winding, the main winding is wound on the periphery of the magnetic core in a single-layer fitting manner by adopting a single-strand multi-core wire, the auxiliary winding is wound on the periphery of the main winding side by side by adopting N-strand multi-core wires, and N is an integer greater than or equal to two. According to the utility model, the main winding adopts the single-strand multi-core wire, under the condition of the same cross section area, the number of turns of the single-strand winding is less than that of the multi-strand winding, and the inductance is correspondingly reduced, so that the alternating-current impedance is reduced, and the energy conversion performance of the transformer is improved; according to the secondary winding, N strands of multi-core wires are adopted, under the condition of the same cross sectional area, compared with a single strand, the multi-strand wires increase the conductor surface area through which current flows, loss caused by the skin effect can be remarkably reduced, meanwhile, the current density is effectively dispersed, and the heat dissipation capacity is improved. The secondary winding is wound on the periphery of the main winding, mutual inductance interference between the secondary winding and the main winding can be effectively reduced, energy loss is reduced, and the energy conversion efficiency is further improved.

To provide a battery management device, a battery management method, and a control program that enable efficient and low-cost charging of lithium-ion secondary batteries. [Solution] The battery management device according to this disclosure includes a high-frequency signal supply unit that applies a high-frequency signal of 0.1 MHz or higher to a first battery cell having a low battery temperature among a plurality of battery cells constituting a lithium-ion secondary battery; an impedance detection unit that detects the actual AC impedance of the first battery cell to which the high-frequency signal has been applied; and a determination unit that determines whether or not Li has been deposited in the lithium-ion secondary battery based on the actual AC impedance of the first battery cell.

A detection device according to the present disclosure is a detection device for detecting a status of a lithium-ion secondary battery, the detection device including a control module that acquires real part of AC impedance at a frequency at which the real part of the AC impedance is increased 10 times or more than the real part of the AC impedance at 1 KHz due to a skin effect, and that detects deposition of lithium and / or the presence of foreign metal inside the lithium-ion secondary battery by using the acquired real part of the AC impedance.

To provide a battery management device that can suppress the risk of prolonged charging times. [Solution] The battery management device 10 according to this disclosure includes an acquisition unit 16 that acquires a degradation evaluation value for evaluating the progress of the high-rate degradation state of a lithium-ion secondary battery; a high-frequency signal supply unit 11 that supplies a high-frequency signal with a frequency of 0.1 MHz or higher to the lithium-ion secondary battery; a detection unit that detects the real value of the AC impedance from the lithium-ion secondary battery to which the high-frequency signal has been supplied; a calculation unit 13 that calculates the amount of Li deposited in the lithium-ion secondary battery from the detected real value of the AC impedance; and a control unit 14 that lowers the upper limit degradation evaluation value of the lithium-ion secondary battery, which is a criterion for determining whether or not the lithium-ion secondary battery is likely to reach a high-rate degradation state, as the calculated amount of Li deposited increases.

Provided is a method for evaluating oxidation resistance of a sulfide solid electrolyte containing a lithium (Li) element and a sulfur (S) element. In the present invention, direct current resistance or alternating current impedance of a mixture of the sulfide solid electrolyte and an oxide of nickel, manganese, or cobalt is measured over time; and oxidation resistance of the sulfide solid electrolyte is evaluated on the basis of a change over time in said resistance or said impedance. The oxide of nickel preferably contains NiO2. The oxide of manganese preferably contains MnO2. The oxide of cobalt preferably contains CoO2.

To provide a battery management device, a battery management method, and a control program that enable efficient charging of lithium-ion secondary batteries. [Solution] The battery management device according to the present disclosure includes: a temperature detection unit for detecting the temperature of a lithium-ion secondary battery; a high-frequency signal supply unit for supplying a high-frequency signal of 0.1 MHz or higher to the lithium-ion secondary battery; an impedance detection unit for detecting the real value of the AC impedance from the lithium-ion secondary battery to which the high-frequency signal has been supplied; a calculation unit for calculating the amount of Li deposited in the lithium-ion secondary battery from the detected real value of the AC impedance; and a control unit for controlling the allowable charging power for the lithium-ion secondary battery and the upper limit temperature of the lithium-ion secondary battery, which is a temperature that serves as a criterion for determining whether or not the lithium-ion secondary battery is at risk of overheating.

The invention relates to the technical field of battery performance detection and electrochemical analysis, in particular to a rapid battery capacity analysis method, which comprises the following steps of: firstly, selecting batteries which are not lower than 3% of the same batch as samples, and performing alternating current impedance test, charge and discharge test and data association operation; establishing a capacity analysis standard containing a batch impedance reference coefficient and a 1C capacity calibration value; performing an AC impedance test on the to-be-tested battery to generate a to-be-tested impedance variable quantity, and performing adjustment by combining a temperature correction algorithm to obtain a temperature correction impedance variable quantity; and importing into a standard for comparison, deducing a capacity matching degree and a charge-discharge performance rating value, and finally outputting a battery capacity interval value and a charge-discharge cycle durability rate. According to the rapid battery capacity analysis method, the capacity analysis standard is established by selecting the batteries in the same batch, and the alternating current impedance test and the data association operation are combined, so that the test time consumption of a single battery is greatly shortened, and the requirement of a batch detection scene is met.

The invention discloses a lithium battery health degree and risk level detection method and device, a medium and a product, and the method comprises the steps: sequentially and simultaneously charging a plurality of cells based on obtained pulse charging current sources of a plurality of frequency points, and recording the voltage and current data, obtained through synchronous measurement, of each cell when each frequency point is charged; according to the recorded voltage and current data of each battery cell at each frequency point, calculating the alternating current impedance of each battery cell at each frequency point, and forming an impedance spectral line of each battery cell by adopting a regression method according to the alternating current impedance of each battery cell at a plurality of frequency points; and performing comparison according to the impedance spectral line of each battery cell in combination with a pre-stored standard spectral line to obtain the health degree and the risk level of each battery cell. According to the invention, through multi-frequency-point measurement and impedance spectral line drawing, detection of the health degree and the risk level of each cell is realized.

The invention relates to the technical field of fuel cells, and discloses a broadband multi-domain fuel cell stack alternating current impedance test method, which comprises the following steps: carrying out broadband impedance scanning in a fuel cell health state, establishing a reference impedance spectrum, and screening key characteristic frequency points; in normal operation, periodic rapid impedance measurement is only carried out on a few monitoring frequency points, and second-level state inspection is realized; and when the impedance value of the monitoring frequency point exceeds a threshold value, triggering abnormity, intelligently selecting a group of diagnosed frequency points according to a preset fault model to carry out rapid and refined measurement, and judging the fault type, severity and cause through the model. According to the method, the contradiction that traditional full-frequency scanning consumes too long time and single-frequency monitoring is insufficient in reliability is solved, unification of quick response and accurate diagnosis is achieved, system resource consumption is remarkably reduced, and the method is particularly suitable for online health management of a fuel cell system.

A battery management apparatus according to the present disclosure includes: an AC signal supply unit configured to supply an AC signal to a lithium-ion secondary battery; an impedance detection unit configured to detect a value of a real part of an AC impedance from the lithium-ion secondary battery to which the AC signal has been supplied; an expansion amount calculation unit configured to calculate an amount of expansion of a cell in the lithium-ion secondary battery based on a difference between the detected current value of the real part of the AC impedance and an initial value of the real part of the AC impedance; and a control unit configured to decrease an upper limit value of a state of charge of the lithium-ion secondary battery as the calculated amount of expansion increases.

To provide a battery management device and battery management system that can achieve efficient charging of lithium-ion secondary batteries. [Solution] The battery management device according to this disclosure comprises: a high-frequency signal supply unit that supplies a high-frequency signal of 0.1 MHz or higher to a lithium-ion secondary battery; an impedance detection unit that detects the real value of the AC impedance from the lithium-ion secondary battery to which the high-frequency signal has been supplied; a calculation unit that calculates the amount of Li deposited in the lithium-ion secondary battery from the detected real value of the AC impedance; and a control unit that reduces the allowable charging power for the lithium-ion secondary battery as the calculated amount of Li deposited increases.

The invention provides an aerosol generation system and a control method. Wherein the aerosol-generating system comprises: a susceptor for heating an aerosol-generating substrate to generate an aerosol; the LC oscillator comprises an induction coil and a capacitor; the LC oscillator is configured to guide the alternating current to flow through the induction coil so as to drive the induction coil to provide energy to the susceptor, so that the susceptor heats the aerosol generating substrate; and a controller programmed to determine the AC impedance of the susceptor from the resonant voltage of the LC oscillator, and further programmed to determine the temperature of the susceptor from the AC impedance of the susceptor. According to the aerosol generating system, the working temperature of the susceptor is controlled by detecting the alternating current impedance of the susceptor during working.

The invention provides a method, a device and equipment for determining the state of charge of a solid-state battery, and a medium, and the method comprises the steps: applying an excitation signal with a specified characteristic frequency to a to-be-detected solid-state battery, synchronously measuring the electrical response under the excitation signal, and determining the AC impedance under the specified characteristic frequency according to the electrical response; the total pressure borne by the to-be-detected solid-state battery is collected, pressure decoupling is conducted on the total pressure based on alternating-current impedance, and internal cause pressure generated by internal electrochemical reaction of the battery and external cause pressure caused by external factors of the battery are obtained; and determining the charge state of the to-be-detected solid-state battery based on the alternating-current impedance, the internal cause pressure and the external cause pressure. By adopting the method, the device and the equipment for determining the state of charge of the solid-state battery and the medium, the problems of low estimation precision and poor robustness of the state of charge of the solid-state battery under a complex working condition are solved.