학술논문
锂电池的两阶段老化过程经验模型与分析 / Analysis on an empirical model for lithium-ion battery two-stage aging processes
Document Type
Academic Journal
Author
Source
高校化学工程学报 / Journal of Chemical Engineering of Chinese Universities. 38(1):113-120
Subject
Language
Chinese
ISSN
1003-9015
Abstract
锂离子电池的老化过程可分为固体电解质界面膜增长和锂沉积机制主导的 2 个阶段.为了快速准确预测锂离子电池的循环寿命,并快速识别老化过程两阶段的转折点,建立了基于锂电池电化学过程模型的两阶段老化过程经验模型.针对镍钴锰酸锂电池的老化过程,基于电池两阶段电化学过程模型获得不同参数条件下两阶段的电池老化数据,采用两步非线性拟合方法获得了锂离子电池两阶段老化过程的经验模型,验证了该经验模型的有效性,并与传统的半经验模型进行了对比分析.结果表明:所建立的电池老化过程经验模型可以有效预测不同参数条件下电池的两阶段老化过程.特别是在电池加速老化阶段,所建立的经验模型明显优于传统的半经验模型.
The aging process of lithium-ion batteries could be divided into two stages dominated by solid electrolyte interphase(SEI)growth and lithium plating mechanism.In order to quickly and accurately predict the aging process of lithium-ion batteries and identify the turning points of the two-stage aging process,an empirical model of the two-stage aging process based on electrochemical process model was established.Aiming at the aging process of Li(NiMnCo)O2 battery,the two-stage aging data under different parameter conditions were obtained based on the two-stage electrochemical process model.The two-stage empirical model of lithium-ion batteries under different conditions was obtained using a two-step nonlinear fitting method,and the empirical model was verified and compared with the traditional semi-empirical model.The results show that the empirical model of the battery aging process established in this work can effectively predict the two-stage aging process under different parameter conditions and is better than the traditional semi-empirical model particularly in the accelerated aging stage.
The aging process of lithium-ion batteries could be divided into two stages dominated by solid electrolyte interphase(SEI)growth and lithium plating mechanism.In order to quickly and accurately predict the aging process of lithium-ion batteries and identify the turning points of the two-stage aging process,an empirical model of the two-stage aging process based on electrochemical process model was established.Aiming at the aging process of Li(NiMnCo)O2 battery,the two-stage aging data under different parameter conditions were obtained based on the two-stage electrochemical process model.The two-stage empirical model of lithium-ion batteries under different conditions was obtained using a two-step nonlinear fitting method,and the empirical model was verified and compared with the traditional semi-empirical model.The results show that the empirical model of the battery aging process established in this work can effectively predict the two-stage aging process under different parameter conditions and is better than the traditional semi-empirical model particularly in the accelerated aging stage.