scholarly journals Battery State Estimation for Lead-Acid Batteries under Float Charge Conditions by Impedance: Benchmark of Common Detection Methods

2018 ◽  
Vol 8 (8) ◽  
pp. 1308 ◽  
Author(s):  
Julia Badeda ◽  
Monika Kwiecien ◽  
Dominik Schulte ◽  
Dirk Sauer
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Relative Increase ◽  
Detection Methods ◽  
Uninterruptible Power Supply ◽  
Lead Acid Batteries ◽  
Uninterruptible Power ◽  
Eis Measurements ◽  
Lead Acid

Impedance or admittance measurements are a common indicator for the condition of lead-acid batteries in field applications such as uninterruptible power supply (UPS) systems. However, several commercially available measurement units use different techniques to measure and interpret the battery impedance. This paper describes common measurement methods and compares their indication for the state of health (SoH) to those of electrochemical impedance spectroscopy (EIS). For this analysis, two strings consisting each of 24 valve-regulated lead-acid (VRLA) batteries with a rated voltage of 12 V and about 7 Ah capacity were kept under standard UPS conditions in float charge for over 560 days. They were monitored continuously with a LEM Sentinel 2 and went into regular check-ups with impedance measurements by a Hioki BT3554 as well as electrochemical impedance spectroscopy (EIS) measurements with an impedance meter (μEIS). Today it is widely expected that solely the relative increase of the impedance reading is sufficient for the estimation of the available capacity. However, it can be shown that the measured relative increase deviates for different frequencies and therefore the choice of the excitation signal and measurement frequency does make a difference for the calculation of the available capacity. Finally, a method for a more decisive monitoring in field applications is suggested.

scholarly journals Determination of SoH of Lead-Acid Batteries by Electrochemical Impedance Spectroscopy

2018 ◽  
Vol 8 (6) ◽  
pp. 873 ◽  
Author(s):  
Monika Kwiecien ◽  
Julia Badeda ◽  
Moritz Huck ◽  
Kuebra Komut ◽  
Dilek Duman ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Lead Acid Batteries ◽  
Lead Acid

scholarly journals Verification of Redox Flow Batteries’ Functionality by Electrochemical Impedance Spectroscopy Tests

Batteries ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 58 ◽  
Author(s):  
Daniel Manschke ◽  
Thorsten Seipp ◽  
Sascha Berthold ◽  
K. Friedrich
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Comparison Method ◽  
Redox Flow Batteries ◽  
Current Voltage ◽  
Flow Batteries ◽  
Quantitative Statement ◽  
Characteristic Values ◽  
Eis Measurements

The state-of-the-art functionality test of classic redox-flow-stacks measures the current–voltage characteristic with the technical electrolyte. This research paper aims to simplify the validation of redox flow batteries’ functionality by conducting electrochemical impedance spectroscopy (EIS) on redox flow stacks. Since the electrolyte used in the batteries is usually toxic and aggressive, it would be a significant simplification to verify the functionality with an alternative, non-toxic fluid. EIS measurements on batteries with larger sized electrodes, multiple cells, and different fluids were performed. It was demonstrated that all impedances are repeatable, thereby validating this procedure as a qualification method for full-size and complex batteries with an alternative fluid. EIS measurements were able to detect deliberately manipulated cells. This research uses three different analysis methods for the acquired data to identify errors. The respective approaches are, firstly, (1) a comparison of the Nyquist plots; secondly, (2) a comparison of the Bode plots; and thirdly, (3) a comparison of the calculated characteristic values of the equivalent circuits. The analysis found that all methods are suitable to detect errors in the batteries. Nevertheless, the bode-plot comparison method proves to be especially advantageous, because it enables a quantitative statement.

scholarly journals Advances in Electrochemical Impedance Spectroscopy Detection of Endocrine Disruptors

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6443
Author(s):  
Lucian-Gabriel Zamfir ◽  
Mihaela Puiu ◽  
Camelia Bala
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Endocrine Disruptors ◽  
Electrochemical Impedance ◽  
Early Stage ◽  
Endocrine System ◽  
Detection Methods ◽  
Enzyme Linked Immunosorbent Assay ◽  
Portable Devices ◽  
Wide Range

Endocrine disruptors (EDs) are contaminants that may mimic or interfere with the body’s hormones, hampering the normal functions of the endocrine system in humans and animals. These substances, either natural or man-made, are involved in development, breeding, and immunity, causing a wide range of diseases and disorders. The traditional detection methods such as enzyme linked immunosorbent assay (ELISA) and chromatography are still the golden techniques for EDs detection due to their high sensitivity, robustness, and accuracy. Nevertheless, they have the disadvantage of being expensive and time-consuming, requiring bulky equipment or skilled personnel. On the other hand, early stage detection of EDs on-the-field requires portable devices fulfilling the Affordable, Sensitive, Specific, User-friendly, Rapid and Robust, Equipment free, Deliverable to end users (ASSURED) norms. Electrochemical impedance spectroscopy (EIS)-based sensors can be easily implemented in fully automated, sample-to-answer devices by integrating electrodes in microfluidic chips. The latest achievements on EIS-based sensors are discussed and critically assessed.

scholarly journals Regularized Collocation in Distribution of Diffusion Times Applied to Electrochemical Impedance Spectroscopy

2020 ◽  
Vol 20 (3) ◽  
pp. 517-530 ◽  
Author(s):  
Sergei V. Pereverzev ◽  
Sergiy G. Solodky ◽  
Vitalii B. Vasylyk ◽  
Mark Žic
Keyword(s):  
Integral Equation ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Numerical Experiments ◽  
Electrochemical Impedance ◽  
Synthetic Data ◽  
Numerical Implementation ◽  
Integrable Kernel ◽  
Weighted Functional Spaces ◽  
Eis Measurements

AbstractThis paper is inspired by recently proposed approach for interpreting data of Electrochemical Impedance Spectroscopy (EIS) in terms of Distribution of Diffusion Times (DDT). Such an interpretation requires to solve a Fredholm integral equation of the first kind, which may have a non-square-integrable kernel. We consider a class of equations with above-mentioned peculiarity and propose to regularize them in weighted functional spaces. One more issue associated with DDT-problem is that EIS data are available only for a finite number of frequencies. Therefore, a regularization should unavoidably be combined with a collocation. In this paper we analyze a regularized collocation in weighted spaces and propose a scheme for its numerical implementation. The performance of the proposed scheme is illustrated by numerical experiments with synthetic data mimicking EIS measurements.

scholarly journals Impedimetric Characterization of Interdigitated Electrode Arrays for Biosensor Applications

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 899 ◽  
Author(s):  
Elisabeth Kostal ◽  
Stephan Kasemann ◽  
Can Dincer ◽  
Stefan Partel
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Gap Size ◽  
Electrode Arrays ◽  
Electrode Gap ◽  
Interdigitated Electrode ◽  
Eis Measurements ◽  
Biosensor Applications

We present recent results of the electrochemical impedance spectroscopy (EIS) measurements for interdigitated electrode arrays (IDAs) ranging from several micrometers down to hundreds of nanometers. Simulations have shown that the electric field strength between the electrodes scales with the gap size. Therefore, electrodes of varying gap sizes were fabricated and functionalized with ssDNA to empirically validate these findings. The results have shown that the impedimetric response strongly correlates with the width of the electrode fingers: the smaller the electrode gap, the larger the impedance increase.

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