• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (20): 44-51.doi: 10.3901/JME.2019.20.044

• 特邀专栏:动力电池系统关键技术 • 上一篇    

车用并联电池组不均衡电流建模与仿真分析

黄鑫, 冯旭宁, 韩雪冰, 卢兰光, 欧阳明高   

  1. 清华大学汽车安全与节能国家重点实验室 北京 100084
  • 收稿日期:2019-01-27 修回日期:2019-06-20 发布日期:2020-01-07
  • 通讯作者: 欧阳明高(通信作者),男,1958年出生,教授,博士研究生导师。主要研究方向为节能与新能源汽车动力系统与控制。E-mail:ouymg@mail.tsinghua.edu.cn
  • 作者简介:黄鑫,男,1993年出生,博士研究生。主要研究方向为锂离子动力电池耐久性。E-mail:huangx1028@gmail.com
  • 基金资助:
    国家国际科技合作专项(2016YFE0102200)和国家自然科学基金(U1564205)资助项目。

Study on Modelling and Analysis of Imbalanced Current inside Parallel-connected Lithium-ion Batteries for Electric Vehicle

HUANG Xin, FENG Xuning, HAN Xuebing, LU Languang, OUYANG Minggao   

  1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084
  • Received:2019-01-27 Revised:2019-06-20 Published:2020-01-07

摘要: 车用锂离子电池在实际使用过程中通常需要进行串并联以满足功率输出和能量存储的需求。然而电池间不一致带来的并联电池组内不均衡电流会影响电池组寿命和安全。建立一种N节单体电池并联的电池组等效电路模型。试验结果表明,此等效电路模型在稳态和动态工况均有较好的精度。此等效电路模型可以用于预测并联电池组内部的不均衡电流,分析不均衡电流的分配原理。仿真分析结果表明,容量和内阻的不一致性增加会带来并联电池组内部不均衡相对量IRe和SOCRe的增加。容量增加20%,IRe增加17.0%,SOCRe增加3.7%;内阻增加100%,IRe增加18.2%,SOCRe增加5.7%。

关键词: 载荷能量存储, 锂离子电池, 不均衡电流, 电流分配, 等效电路模型

Abstract: Lithium-ion batteries are always connected in series and parallel in order to fulfill its functional usage. However, imbalanced current caused by cell variations has significant impact on the life and safety of battery pack. An equivalent circuit model for battery pack composing of cells connected in parallel is introduces. Experimental results show that the model has good accuracy under both steady and dynamic working loads. The proposed method simulates current distribution among parallel-connected cells and can help analyze the behaviors of current distribution. Simulation results show that the increase of the relative quantity IRe and SOCRe representing imbalanced current and state of charge (SOC) variation can be caused by the increase of battery capacity and resistance variation. 20% increase in capacity leads to IRe increasing by 17.0% and SOCRe increasing by 3.7%, while 100% increase in resistance leads to IRe increasing by 18.2% and SOCRe increasing by 5.7%.

Key words: energy storage, lithium-ion battery, imbalanced current, current distribution, equivalent circuit model

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