Rate-based degradation modeling of lithium-ion cells
Rate-based degradation modeling of lithium-ion cells
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DOI：
10.1016/j.jpowsour.2012.01.106
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发表时间：
2012-05
影响因子：
9.2
通讯作者：
E. Thomas;I. Bloom;J. Christophersen;V. Battaglia
中科院分区：
文献类型：
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作者：
E. Thomas;I. Bloom;J. Christophersen;V. Battaglia
加速退化测试通常用作在一定范围的应力条件（例如，温度）。性能通过被假定为与小区的健康状态相关的某个响应来测量（例如，放电电阻）。通常，这种测试的最终目标是预测在一些参考应力条件下的电池寿命，其中电池寿命被定义为性能已经退化到某个临界水平的时间点。这些预测是基于一个退化模型，该模型表达了预期的性能水平与电池老化的时间和条件。通常，退化模型将累积退化与恒定应力水平下的时间相关联。本文的目的是提出一个替代框架，用于构建一个退化模型，侧重于退化率，而不是累积退化。这种替代方法的一个好处是，在温度暴露不是等温的情况下，大大促进了电池寿命的预测。这种替代建模框架说明通过一个家庭的基于速率的模型和实验数据在电池寿命测试的高功率锂离子电池。
Accelerated degradation testing is commonly used as the basis to characterize battery cell performance over a range of stress conditions (e.g., temperatures). Performance is measured by some response that is assumed to be related to the state of health of the cell (e.g., discharge resistance). Often, the ultimate goal of such testing is to predict cell life at some reference stress condition, where cell life is defined to be the point in time where performance has degraded to some critical level. These predictions are based on a degradation model that expresses the expected performance level versus the time and conditions under which a cell has been aged. Usually, the degradation model relates the accumulated degradation to the time at a constant stress level. The purpose of this article is to present an alternative framework for constructing a degradation model that focuses on the degradation rate rather than the accumulated degradation. One benefit of this alternative approach is that prediction of cell life is greatly facilitated in situations where the temperature exposure is not isothermal. This alternative modeling framework is illustrated via a family of rate-based models and experimental data acquired during calendar-life testing of high-power lithium-ion cells.