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• W3186111808 endingPage "100129" @default.
• W3186111808 startingPage "100129" @default.
• W3186111808 abstract "Parameter variations of lithium-ion batteries are an important concern because they can reduce the performance of a battery pack. To quantify inherent variations due to production tolerances, battery parameters of a batch of individual cells are experimentally determined and the latest studies show capacity variations of 0.2 %–0.3 % and impedance variations of 0.7 %–3.8 %. Motivated by the question of why impedance variation is consistently reported to be higher than the variation of other parameters, we show that measuring inherent parameter variations caused by production tolerances is superimposed by effects of an imperfect measurement setup. By breaking down external influence factors on own experimental results of a batch of 600 commercial lithium-ion cells as well as a previously published data set, we found that in fact parameter variations are substantially biased by temporal and spatial temperature inhomogeneities during the experiments. By systematically compensating these effects, resistance variation is reduced by almost 50 % to only 0.45 %, which is the smallest value reported so far and closer to the variation of capacity (0.17 %) and mass (0.11 %) in our case. Compensation is justified by a Monte-Carlo simulation of the charge-transfer resistance and the cell temperature to investigate the mutual interaction between resistance and temperature variation. Our results show that extrinsic temperature deviations of only 0.5°C can lead to resistance variations of more than 1.5 %. Based on our findings, we recommend incorporating more restrained initial parameter variations into system simulation models and setting the focus on external origins of parameter variations such as temperature inhomogeneities." @default.
• W3186111808 created "2021-08-02" @default.
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• W3186111808 date "2021-08-01" @default.
• W3186111808 modified "2023-10-16" @default.
• W3186111808 title "Quantifiability of inherent cell-to-cell variations of commercial lithium-ion batteries" @default.
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• W3186111808 doi "https://doi.org/10.1016/j.etran.2021.100129" @default.
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