Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Williard, Nicholas DaneSubject: search.filters.subject.State Estimation

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    DEGRADATION ANALYSIS AND HEALTH MONITERING OF LITHIUM ION BATTERIES
    (2011) Williard, Nicholas Dane; Pecht, Michael; Mechanical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Degradation and health monitoring of lithium-ion batteries is explored through life-cycle testing and failure analysis. Test samples comprised of four different battery types from two different manufactures underwent aging and charge/discharge cycling using a variety of load profiles including constant current discharge, pulsed discharge, and varying depths of discharge. Data from in situ monitoring of several parameters including current, voltage, temperature and internal resistance, was analyzed in order to find the best features that could be used to track and characterize battery performance degradation. Degraded samples were disassembled according to a newly developed disassembly methodology that considered the effects of the environment on post-disassembly failure analysis results. Several different failure analysis methods were used in order to gain an understanding of how degradation mechanisms propagate from a materials stand point. Battery electrodes were investigated to observe changes in their chemical and mechanical structures.