Test Center for Aging Analysis and Characterization of Lithium-Ion Batteries for Automotive Applications

Fischnaller, Manuel; Melbert, Joachim; Scharner, S.; Eichner, Tanja

doi:10.4271/2011-01-1374

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…The current topics of research around lithium ion cells as energy storage for different applications, such as automotive, 1 grid tied energy storage 2 or airborne board net applications 3 are focused on their safe thermal and electrical integration. Upcoming in the last years is the issue of expectable lifetime of lithium ion cells under various load conditions, as a high aging rate could become a hindrance for their fast mass market introduction in applications requesting longer term durability than e.g.…”

mentioning

confidence: 99%

“…7,8 These research studies are explaining basic electrochemical theory, [9][10][11] small single-factorial experiments for rough aging estimation [12][13][14][15][16] and lately extended experiments trying to find connections between multiple influence factors and the resulting cell aging. 1,[17][18][19][20][21] Thereby the definition of aging of a lithium ion cell is mostly based around the fact that it loses its available capacity in response to time and its environmental influences as for example temperature, average current and cycle numbers. 22 This can be considered a rather single sided view of things, because cell aging is an increase in impedance also, meaning an increase in ohmic resistance and a loss in dynamic current capability and relaxation ability.…”

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confidence: 99%

“…1). 1,2,4,5 Information gained from literature 9,11 leaves one with a good impression of the nonlinearity of the aging of cells. Contrarily there was limited information concerning interactions of the influence factors available, so a large scale aging experiment seemed most plausible.…”

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confidence: 99%

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Design-of-Experiment and Statistical Modeling of a Large Scale Aging Experiment for Two Popular Lithium Ion Cell Chemistries

Prochazka

Pregartner

Cifrain

2013

J. Electrochem. Soc.

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This paper demonstrates the method of design-of-experiment for an aging test of two popular lithium ion cell chemistries used in consumer and automotive industry. A design of experiment helps to produce statistically repeatable data of the aging behavior of cells, unlike small scale experiments with single cells and/or single influences. After setting up the experiment, measurements for over 150 cells of the two popular cathode chemistries iron-phosphate and nickel-cobalt-aluminum against a graphite anode are presented. These results are then subjected to statistical modeling in order to distill the information gain about the cell aging more easily. The models received reflect the complex behavior of the many electrochemical cell aging processes rather well. So it can be concluded that pure influence factors and their interactions show significant influence on the cell aging behavior, but not all possible interactions are needed in future testing for cell aging of new chemistries.

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confidence: 99%

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confidence: 99%

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Design-of-Experiment and Statistical Modeling of a Large Scale Aging Experiment for Two Popular Lithium Ion Cell Chemistries

Prochazka

Pregartner

Cifrain

2013

J. Electrochem. Soc.

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“…To reach these goals, the cell chemistry is steadily optimized. To evaluate the performance of a cell technology, benchmark and cycle life, studies are conducted (Fischnaller et al, 2011). These studies rely on precise and reproducible characterization methods to quantify the cell's key properties, like its internal resistance and capacitance, which are strongly influenced by the material composition of the cell (Schmidt et al, 2011).…”

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confidence: 99%

Optimized mixed-domain signal synthesis for broadband impedance spectroscopy measurements on lithium ion cells for automotive applications

Haussmann

Melbert

2017

J. Sens. Sens. Syst.

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Abstract. A new impedance spectroscopy measurement procedure for automotive battery cells is presented, which is based on waveform shaping. The method is optimized towards a short measurement duration, high excitation power and increased frequency resolution and overcomes limitations of established methods. For a given spectral magnitude profile, a corresponding time domain waveform is derived from the inverse discrete Fourier transform. Applying an identical initial phase angle for each frequency component, the resulting signal exhibits a high peak-to-peak amplitude at relatively low total excitation power. This limits the maximum allowed power for quasi-linear excitation. Altering the phase angles randomly spreads the excitation power across the complete measurement duration. Thereby, linearity is preserved at higher excitation power. A large set of phase patterns is evaluated statistically in order to obtain a phase pattern with a significant peak-to-peak amplitude decrease. By means of numerical optimization, even further peak-to-peak amplitude reduction is achieved. Including window functions in the synthesis concept minimizes spectral leakage without compromising the spectral signal magnitude in the frequency range of interest. A time domain waveform optimized for impedance spectroscopy on lithium ion cells is synthesized based on the proposed approach and evaluated on real automotive cells. The resulting impedance data show good concordance with established standard measurement procedures at significantly reduced measurement duration and charge throughput. Additionally, increased frequency resolution is achieved, enhancing the level of detail of the obtained impedance data. The method is used for improved localization of aging effects in the cells, without further stress of the cells by the measurement procedure.

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600-A Test System for Aging Analysis of Automotive Li-Ion Cells With High Resolution and Wide Bandwidth

WeBkamp

HauBmann

Melbert

2016

IEEE Trans. Instrum. Meas.

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Test Center for Aging Analysis and Characterization of Lithium-Ion Batteries for Automotive Applications

Cited by 5 publications

References 3 publications

Design-of-Experiment and Statistical Modeling of a Large Scale Aging Experiment for Two Popular Lithium Ion Cell Chemistries

Design-of-Experiment and Statistical Modeling of a Large Scale Aging Experiment for Two Popular Lithium Ion Cell Chemistries

Optimized mixed-domain signal synthesis for broadband impedance spectroscopy measurements on lithium ion cells for automotive applications

600-A Test System for Aging Analysis of Automotive Li-Ion Cells With High Resolution and Wide Bandwidth

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