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논문 기본 정보

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(Korea Electrical Safety Corporation(KESCO)) (Korea Electrical Safety Corporation(KESCO)) (Korea Electrical Safety Corporation(KESCO)) (Korea Electrical Safety Corporation(KESCO)) (Korea Electrical Safety Corporation(KESCO)) (Jeonbuk National University)
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대한전기학회 전기학회논문지 전기학회논문지 제75권 제10호
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    초록·키워드

    Over-discharge of large-format lithium-ion cells can cause electrochemical and mechanical degradation, leading to safety concerns. This study investigated a 67 Ah NCM pouch cell using electrochemical impedance spectroscopy (EIS), acoustic emission (AE), and X-ray computed tomography (X-ray CT). Repeated low-rate discharge under 0% SOC changed the EIS spectrum from two arcs to one dominant arc, suggesting a possible overlapping of SEI-related relaxation and charge transfer processes. During forced over-discharge, burst-type AE signals were detected irregularly, particularly near the voltage reversal region. Post-test X-ray CT showed pouch swelling and displacement or separation of the internal electrode stack. The results demonstrate that EIS and AE/X-ray CT have the potential to serve as complementary diagnostic indicators for estimating gradual electrochemical degradation and abrupt structural changes during severe over-discharge. Further repeated tests are required to improve the reliability of AE-based diagnosis.

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