一种基于多影响因素的锂离子电池放电内阻动态模型

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中文摘要：直流内阻(DCR)是衡量电池健康状况的关键指标，在实际应用中对功率状态的估算以及热管理都具有重要意义。锂离子电池放电DCR与环境温度、电池荷电状态(SOC)以及放电倍率(C-rate)等因素有关，为了研究这些因素对电池内阻的影响，本文提出一种基于多影响因素的锂离子电池放电内阻动态模型，利用二元四次多项式对DCR与环境温度和电池SOC进行最小二乘拟合，再将所得二元四次多项式系数与放电倍率进行三次多项式拟合，最终建立DCR与放电倍率、环境温度和SOC之间关系的内阻模型。运用多倍率混合脉冲功率特性(HPPC)实验对锂离子电池进行充放电测试，并根据测试数据对所提出的模型进行验证，实验结果表明，所建立的动态内阻模型获得的DCR估算值与实验值的最大均方根误差为0。9758 mΩ，证明所提出的电池放电内阻模型是有效的。

外文标题：A discharging internal resistance dynamic model of lithium-ion batteries based on multiple influencing factors

外文摘要：Direct current internal resistance(DCR)is a key indicator for assessing the health status of batteries,and it is of significant importance in practical applications for power estimation and battery thermal management.The DCR of lithium-ion batteries is influenced by factors such as environmental temperature,state of charge(SOC),and current rate(C-rate).In order to investigate the influence of these factors on battery DCR,this paper proposes a DCR dynamic model of lithium-ion battery based on multiple influencing factors(multi-factor).The model utilizes a binary quadratic polynomial to perform least squares fitting of the DCR with respect to environmental temperature and battery SOC.The obtained coefficients of the binary quadratic polynomial are then fitted with a cubic polynomial with respect to the C-rate,thus establishing the relationship between DCR and C-rate,environmental temperature,and SOC.Multi-rate hybrid pulse power characterization(HPPC)experiment is conducted to perform charging-discharging tests on lithium-ion batteries.The experimental results demonstrate that the RMSE between the estimated DCR obtained from the established model and the experimental values is 0.9758 mΩ,confirming the effectiveness of the proposed DCR model.

外文关键词：

lithium-ion batteryHPPC experimentdischarging internal resistancemultiple influencing factorspolynomial fitting

作者：

巫春玲、宋江鑫、黄鑫蓉、赵玉冰、孟锦豪

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作者单位：

School of Energy and Electrical Engineering,Chang'an University,Xi'an 710061,China

School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China

关键词：

锂离子电池 HPPC实验放电直流内阻多因素内阻模型多项式拟合

基金：

国家重点研发计划陕西省重点研发计划Scientific Research Plan Projects of Shaanxi Education Department,China

项目编号：

2021YFB26013042022GY-19323JE021

出版年：

2024

DOI：

10.1007/s11771-024-5574-y

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDEI

影响因子：0.47

ISSN：2095-2899

年,卷(期)：2024.31(2)

参考文献量23