Diagnosing current distributions in batteries with magnetic resonance imaging
Diagnosing current distributions in batteries with magnetic resonance imaging
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DOI：
10.1016/j.jmr.2019.106601
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发表时间：
2019-12-01
影响因子：
2.2
通讯作者：
Jerschow, Alexej
中科院分区：
文献类型：
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作者：
Mohammadi, Mohaddese;Silletta, Emilia, V;Jerschow, Alexej
众所周知，电池及其缺陷很难进行非破坏性分析，因此，许多缺陷和故障在造成严重损害之前很少被注意和表征。电池内部电流密度分布的测量可以揭示关于偏离理想电池行为的信息，并且因此可以提供劣化或故障的早期迹象。在这里，我们描述的方法，快速无损评估和可视化的影响，锂离子电池袋内的电流分布。该技术基于磁共振成像（MRI），允许在充电/放电期间测量磁场图。分布的显着变化被观察到作为充电状态的函数，也在持续损坏。特别是，它示出的电流分布的非线性和不对称性可以映射在不同的电荷状态。此外，电流的热点也被示出与电荷存储中的热点相关。这种技术在诊断电池的健康状况及其在不同充电或环境条件下的行为方面可能具有很大的实用性。(C)2019爱思唯尔公司All rights reserved.
Batteries and their defects are notoriously difficult to analyze non-destructively, and consequently, many defects and failures remain little noticed and characterized until they cause grave damage. The measurement of the current density distributions inside a battery could reveal information about deviations from ideal cell behavior, and could thus provide early signs of deterioration or failures. Here, we describe methodology for fast nondestructive assessment and visualization of the effects of current distributions inside Li-ion pouch cells. The technique, based on magnetic resonance imaging (MRI), allows measuring magnetic field maps during charging/discharging. Marked changes in the distributions are observed as a function of the state of charge, and also upon sustaining damage. In particular, it is shown that nonlinearities and asymmetries of current distributions could be mapped at different charge states. Furthermore, hotspots of current flow are also shown to correlate with hotspots in charge storage. This technique could potentially be of great utility in diagnosing the health of cells and their behavior under different charging or environmental conditions. (C) 2019 Elsevier Inc. All rights reserved.