Rapid impedance measurement using chirp signals for electrochemical system analysis

Bullecks, Brian; Suresh, Resmi; Rengaswamy, Raghunathan

doi:10.1016/j.compchemeng.2017.05.018

Cited by 42 publications

(18 citation statements)

References 23 publications

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“…5(a) have been vastly applied in the sonar and radar field, albeit sparingly applied in electrochemistry. Reference [16] - [17]; and most recently [6] and [18] verified the selection of chirp as the signal of choice for electrochemical system characterization. Depending on the kind of frequency variation, the frequency of a chirp signal can ramp up or down with time [16] - [17].…”

Section: Chirp Signalmentioning

confidence: 75%

“…Reference [16] - [17]; and most recently [6] and [18] verified the selection of chirp as the signal of choice for electrochemical system characterization. Depending on the kind of frequency variation, the frequency of a chirp signal can ramp up or down with time [16] - [17]. The chirp time-domain function is expressed in (16) and the chirp rate in (17):…”

Section: Chirp Signalmentioning

confidence: 75%

“…The chirp signal has a CF of 1.4 and can complete rapid EIS measurements. The chirp broadband signal has been proposed for electrochemical systems in [16] - [17] but is yet to be applied physically to batteries.…”

Section: Broadband Excitation Signalsmentioning

confidence: 99%

“…Depending on the kind of frequency variation, the frequency of a chirp signal can ramp up or down with time [16] - [17]. The chirp time-domain function is expressed in (16) and the chirp rate in (17):…”

Section: Chirp Signalmentioning

confidence: 99%

See 3 more Smart Citations

Online Impedance Estimation of Sealed Lead Acid & Lithium Nickel - Cobalt - Manganese Oxide Batteries using a Rapid Excitation Signal

Alao¹,

Barendse²

2020

Preprint

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Electrochemical Impedance Spectroscopy (EIS) has gained traction as a technique apt for condition monitoring of batteries. The drawback of EIS is that it is only applicable when the system is offline (i.e. it must be disconnected from the load), takes a long time to complete and requires an expensive equipment for measurement. This work aims to adapt the EIS to serve as an in-situ measurement technique, that can be utilized for online condition monitoring of two unique battery chemistries – lead acid and lithium NCM. This work develops in twofold – firstly, the Chirp broadband signal is proposed amongst a variety of other broadband signals to significantly shorten the time required for EIS measurement. Subsequently, a power converter that is typically used to interface a battery with the load for current and voltage regulation functions, is utilized for online condition monitoring of both batteries through closed loop control of the power converter and duty-cycle perturbation. This combined approach presents a novel low-cost technique for online condition monitoring of batteries, with the ability to complete battery characterization in a very short time. In this regard, EIS measurement is completed for a lead acid battery (with lowest EIS characterization frequency of 0.1Hz) in 5 seconds and lithium NCM battery (with lowest EIS characterization frequency of 20mHz) in 25 seconds.

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Section: Chirp Signalmentioning

confidence: 75%

Section: Chirp Signalmentioning

confidence: 75%

Section: Broadband Excitation Signalsmentioning

confidence: 99%

Section: Chirp Signalmentioning

confidence: 99%

See 2 more Smart Citations

Online Impedance Estimation of Sealed Lead Acid & Lithium Nickel - Cobalt - Manganese Oxide Batteries using a Rapid Excitation Signal

Alao¹,

Barendse²

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The time taken is longer than the wideband impedance measuring methods. In the wideband method, a square wave [23,24], a pseudo-random binary sequence [25,26], a chirp signal [27], or a signal during a driving cycle [28] may be applied to calculate the battery impedance with Fast Fourier transform, time-sharing Fourier transform processing the voltage and the current profiles. Considering a non-stationary excitation signal [29], wavelet transform can also be applied to calculate the battery impedance in the wideband methods.…”

Section: Introductionmentioning

confidence: 99%

Practical On-Board Measurement of Lithium Ion Battery Impedance Based on Distributed Voltage and Current Sampling

2018

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Abstract:Battery impedance based state estimation methods receive extensive attention due to its close relation to internal dynamic processes and the mechanism of a battery. In order to provide impedance for a battery management system (BMS), a practical on-board impedance measuring method based on distributed signal sampling is proposed and implemented. Battery cell perturbing current and its response voltage for impedance calculation are sampled separately to be compatible with BMS. A digital dual-channel orthogonal lock-in amplifier is used to calculate the impedance. With the signal synchronization, the battery impedance is obtained and compensated. And the relative impedance can also be obtained without knowing the current. For verification, an impedance measuring system made up of electronic units sampling and processing signals and a DC-AC converter generating AC perturbing current is designed. A type of 8 Ah LiFePO 4 battery is chosen and the valuable frequency range for state estimations is determined with a series of experiments. The battery cells are connected in series and the impedance is measured with the prototype. It is shown that the measurement error of the impedance modulus at 0.1 Hz-500 Hz at 5 • C-35 • C is less than 4.5% and the impedance phase error is less than 3% at <10 Hz at room temperature. In addition, the relative impedance can also be tracked well with the designed system.

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Implementation and optimization of perturbation currents for vehicular proton exchange membrane fuel cells online electrochemical impedance spectroscopy measurements

Zhang,

Chen

2024

Fuel Cells

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This paper presents an implementation method of perturbation currents for vehicular proton exchange membrane fuel cell (PEMFC) online electrochemical impedance spectroscopy (EIS) measurements. The topology of the parallel dual‐boost DC/DC converter system for the EIS measurement is presented. The DCdc and DCac modules in the converter system implement the DC current and the sinusoidal EIS perturbation current independently. Simulation results show that the proposed perturbation current generation method can be implemented efficiently. In the frequency domain, the current of DCdc couples to the perturbation current of DCac, leading to a reduction in the accuracy of the current amplitude after superposition. The mechanism of current amplitude reduction after superposition is discussed. Feed‐forward compensation and fuzzy compensation optimization are proposed for the DCdc current control. Both compensation algorithms achieve excellent results. A comprehensive framework for evaluating the compensation effect is presented. The evaluation results show that feed‐forward compensation has a better advantage in solving the above problems due to its simplicity and less impact on hardware control. Experimental results show that with the optimization algorithm, the input perturbation current increases from 6% to 83% of the theoretical value.

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Rapid impedance measurement using chirp signals for electrochemical system analysis

Cited by 42 publications

References 23 publications

Online Impedance Estimation of Sealed Lead Acid & Lithium Nickel - Cobalt - Manganese Oxide Batteries using a Rapid Excitation Signal

Online Impedance Estimation of Sealed Lead Acid & Lithium Nickel - Cobalt - Manganese Oxide Batteries using a Rapid Excitation Signal

Practical On-Board Measurement of Lithium Ion Battery Impedance Based on Distributed Voltage and Current Sampling

Implementation and optimization of perturbation currents for vehicular proton exchange membrane fuel cells online electrochemical impedance spectroscopy measurements

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