Equivalent Circuit Model for High C-Rate Discharge with an External Short Circuit
Equivalent Circuit Model for High C-Rate Discharge with an External Short Circuit
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DOI：
10.23919/acc53348.2022.9867199
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Vivian Tran;T. Cai;A. Stefanopoulou;Jason B. Siegel
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文献类型：
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作者：
Vivian Tran;T. Cai;A. Stefanopoulou;Jason B. Siegel
为了在火灾后处理损坏的电池组时提高应急人员的安全性，需要更好的外部短路放电方法来减轻滞留能量的危险，包括电池起火。这项工作使用一个等效电路模型的扩散相关参数的线性标度来捕捉不同初始电荷状态(SOC)的外部短路期间电池的电和热行为。作为放电有效性和安全性的指标，该模型预测在匹配的充满电的情况下，最终SOC在3%SOC以内，峰值温度在2°C以内。将相同的参数集应用于所有初始SOC情况，并讨论了参数敏感性。所提议的方法的一个主要优点是，可以在正常操作条件下执行主要参数设置，从而减少了所需的危险试验量。然后，可以通过调整外部阻力来避免泄气，从而探索受控排放。
To improve emergency responder safety while handling damaged battery packs after a fire, better external short-based discharge methods are needed to mitigate hazards from stranded energy, including battery fire reignitions. This work uses a linear scaling on the diffusion-related parameters of an equivalent circuit model to capture the electrical and thermal behavior of a cell during an external short for different initial state-of-charge (SOC). As metrics of discharge effectiveness and safety, the model predicts the final SOC within 3%SOC and peak temperature within 2°C in the fitted, fully charged case. The same parameter set was applied to all initial SOC cases and parameter sensitivity is discussed. A key advantage of the proposed approach is that the main parameterization can be performed under normal operating conditions reducing the amount of hazardous testing required. This can then be used to explore a controlled discharge by adjusting the external resistance to avoid venting.