Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01d791sj514
 Title: Acoustic Interrogation of Batteries Authors: Gjeltema, Peter James Advisors: Steingart, DanielRowley, Clarence Department: Mechanical and Aerospace Engineering Class Year: 2015 Abstract: A novel method utilizing acoustic time-of-ﬂight measurements is presented for monitoring state of charge and state of health of batteries. The method demonstrates potential as a non-invasive, in situ, and in operando tool capable of characterizing most any closed battery regardless of chemistry. A conceptual underpinning for this method is presented and is based on a fundamental principle regarding mechanical properties of batteries: any battery irrespective of chemistry changes its distribution of density and electrode bulk modulus in direct relation to of state of charge and state of health. These alterations impact speed and attenuation of acoustic waves traveling through a cell. Acoustic computational modeling and experimental results indeed indicate time-of-ﬂight measurements correlate well with state of charge and state of health, and can describe the mechanical evolution of a cell. Initial application of singular value decomposition (SVD) to acoustic time-of-ﬂight measurements in cycling systems is also presented. SVD demonstrates the ability to decouple complex acoustic data; it is capable of revealing internal cell structure from raw data, and exhibits potential to quantify state of charge and state of health. Extent: 64 pages URI: http://arks.princeton.edu/ark:/88435/dsp01d791sj514 Type of Material: Princeton University Senior Theses Language: en_US Appears in Collections: Mechanical and Aerospace Engineering, 1924-2016

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