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首页> 外文期刊>Journal of power sources >Calendar ageing analysis of a LiFePO_4/graphite cell with dynamic model validations: Towards realistic lifetime predictions
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Calendar ageing analysis of a LiFePO_4/graphite cell with dynamic model validations: Towards realistic lifetime predictions

机译：具有动态模型验证的LiFePO_4 /石墨电池的日历老化分析：朝着现实的寿命预测

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摘要

The present study aims at establishing a methodology for a comprehensive calendar ageing predictive model development, focusing specially on validation procedures. A LFP-based Li-ion cell performance degradation was analysed under different temperature and SOC storage conditions. Five static calendar ageing conditions were used for understanding the ageing trends and modelling the dominant ageing phenomena (SEI growth and the resulting loss of active lithium). The validation process included an additional test under other constant operating conditions (static validation) and other four tests under non-constant impact factors operating schemes within the same experiment (dynamic validation), in response to battery stress conditions in real applications. Model predictions are in good agreement with experimental results as the residuals are always below 1% for experiments run for 300-650 days. The model is able to predict dynamic behaviour close to real operating conditions and the level of accuracy corresponds to a root-mean-square error of 0.93%.
机译：本研究旨在建立一种全面的日历老化预测模型开发方法，特别侧重于验证程序。在不同的温度和SOC储存条件下，分析了基于LFP的锂离子电池性能下降。使用五个静态日历老化条件来了解老化趋势并建模主要的老化现象（SEI增长和活性锂的损失）。验证过程包括在其他恒定操作条件下的附加测试（静态验证）和同一实验中在非恒定影响因子操作方案下的其他四项测试（动态验证），以响应实际应用中的电池压力条件。模型预测与实验结果非常吻合，因为在300-650天的实验中残差始终低于1％。该模型能够预测接近实际工况的动态行为，准确度水平对应于0.93％的均方根误差。

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