期刊
ENERGY
卷 239, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.121942
关键词
State-of-Health of resistance; Resistance degradation; Energy equilibrium; Irreversible and entropy change resistance; Discharge current limitation; Lithium-ion batteries
资金
- ABB Pte Ltd, Singapore
- Maritime and Port Authority (MPA) of Singapore
- Civil Aviation Authority of Singapore (CAAS)
- Air Traffic Management Research Institute (ATMRI), Singapore
This study presents a comprehensive framework based on energy equilibrium for the categorization and health analysis of total internal resistance of batteries. The framework divides the internal resistance into two components, one based on irreversible overpotential effects and a new second resistance component originated from reversible entropy changes.
The internal resistance of a battery represents the losses due to heat generation during energy conversion. The state-of-health is used to quantify the increase (degradation) of resistance with usage. However, the current state-of-health analysis merges the total internal resistance into one component. Consequently, the underlying cause of resistance degradation is not understood leading to incorrect estimate of battery health. Therefore, this paper presents a comprehensive framework based on energy equilibrium for the categorization and health analysis of total internal resistance. It is divided into 2 components: one based on irreversible overpotential (includes polarization) effects and a new second resistance component originated from reversible entropy changes. For LiFePO4 cells used in this work, it is observed that the contribution of entropy changes (hitherto unrecognized) to the overall losses increases from 4 - 10% to more than 40% as state-of-charge reduces. State-of-health of each component is obtained by the determination of its associated degradation factor to quantify the underlying mechanism of resistance degradation. In conclusion, the increase in irreversible resistance is primarily attributed to the permanent loss of active material. Correspondingly, the reversible resistance increase is associated to the formation of concentration gradients in the electrodes due to past load profile and ambient conditions. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据