储能科学与技术2024，Vol.13Issue(10)：3622-3629,8.DOI:10.19799/j.cnki.2095-4239.2024.0318
锂离子电池均质化电化学模型的电极颗粒半径分布拓展
Expansion of the homogeneous electrochemical model for lithium-ion batteries to incorporate electrode particle radius distribution
摘要
Abstract
Simulation of lithium-ion batteries plays an important role in battery research and evaluation.The classical pseudo-two-dimensional model used in battery simulations typically assumes a constant electrode particle radius,which limits simulation accuracy.In this study,we enhance the pseudo-two-dimensional model by integrating the cumulative distribution function of electrode particle radius distribution through inverse transformation sampling.This process corrects the active specific surface area of the electrode particles,effectively incorporating the electrode particle radius distribution while maintaining the homogeneity characteristics of the pseudo-two-dimensional model,thereby improving simulation accuracy.Firstly,we derive a theoretical method to incorporate the electrode particle radius distribution into the pseudo-two-dimensional model.We use a pseudo-random function to generate uniform distribution numbers based on electrode spatial coordinates,which are then substituted into the cumulative distribution function to determine the electrode particle radius at different electrode spatial coordinates through inverse transformation sampling.Then,we present a method for correcting the active specific surface area of the electrode particles after introducing the radius distribution,along with expansion equations for common electrode particle radius distributions within the pseudo-two-dimensional model,each with different combinations of expanded radius distribution for the positive and negative electrodes,under the same conditions.Simulations comparing the pseudo-two-dimensional model with and without the expanded radius distribution are conducted and validated against experimental data.The results show that incorporating the radius distribution significantly improves the simulation of polarization changes inside the battery,especially during the relaxation process,leading to enhanced simulation accuracy.关键词
锂离子电池/电化学模型/电极颗粒半径分布/仿真Key words
lithium-ion batteries/electrochemical model/electrode particle radius distribution/simulation分类
数理科学引用本文复制引用
曹昕,李棉刚,侯宇程,贡晓旭,李香龙,周奎,梁惠施,杨清华..锂离子电池均质化电化学模型的电极颗粒半径分布拓展[J].储能科学与技术,2024,13(10):3622-3629,8.基金项目
国网北京市电力公司科技项目(520223230011). （520223230011）
