容量增量内阻一致性在线检测方法

doi:10.12028/j.issn.2095-4239.2019.0102

储能科学与技术 ›› 2019, Vol. 8 ›› Issue (6): 1197-1203.doi: 10.12028/j.issn.2095-4239.2019.0102

容量增量内阻一致性在线检测方法

徐敏¹, 刘中财², 严晓¹, 黄碧雄¹, 王影¹, 王炯耿³

1 上海工程技术大学, 上海 201620;
2 上海玫克生储能科技有限公司, 上海 201800;
3 浙江华云信息科技有限公司, 浙江杭州 310000

收稿日期:2019-05-23 修回日期:2019-07-01 出版日期:2019-11-01 发布日期:2019-07-08
通讯作者: 严晓,上海市千人计划特聘教授,研究方向为基于锂电池储能系统的检测、诊断和分析,E-mail:xiao.yan@sues.edu.cn。
作者简介:徐敏(1995-),女,硕士研究生,主要研究方向为动力电池检测和基于动力电池的储能系统,E-mail:1850283998@qq.com
基金资助:
上海市科委项目：车用动力电池的检测、控制和评估（15110501100），上海工程技术大学新能源汽车协同创新建设试点“新能源汽车与动力电池”项目（2016xt02）。

Online detection method for incremental capacity internal resistance consistency

XU Min¹, LIU Zhongcai², YAN Xiao¹, HUANG Bixiong¹, WANG Ying¹, WANG Jionggeng³

1 Shanghai University of Engineering Science, Shanghai 201620, China;
2 Shanghai Makesens Energy Storage Technology Co., Ltd., Shanghai 201800, China;
3 Zhejiang Huayun Information Technology Co., Ltd., Hangzhou 310000, Zhejiang, China

Received:2019-05-23 Revised:2019-07-01 Online:2019-11-01 Published:2019-07-08

摘要/Abstract

摘要： 电池包单体内阻的不一致会导致短板单体的过充过放，诱发渐变性故障，加剧电池组的失效，安全检测成为市场需求。本文对不同老化程度的磷酸铁锂充电曲线进行分析之后，提出一种基于容量增量的内阻一致性在线检测方法：对充电数据进行分析得到容量增量峰的特征，进而表征单体之间的内阻差异，最后使用箱型图进行异常检测。使用已设计的电池检测系统对电池包进行在线检测与HPPC检测，验证对比发现：两者归一化的单体内阻分布存在较高的一致性，且容量增量在线检测方法成本低、操作简便，适用于大规模的商业电池进行内阻一致性检测，不会对工程效率以及电池组寿命产生影响。在线检测方法为锂离子电池全生命周期预防性安全检测提供方法指导。

关键词: 动力电池充放电检测系统, 一致性, 锂离子电池内阻, 容量增量, 箱型图

Abstract: Inconsistent internal resistance of the battery pack will cause overcharge and over discharge of the short board cells, which will induce gradual fault and aggravate battery pack failure. In this paper, after analyzing the charging curves of LiFePO₄ with different aging degrees, an online detection method based on incremental capacity was proposed. The incremental capacity peak can be obtained by analyzing the charging data, and thus characterize internal resistance differences between cells, last use the box plots for the abnormal detection. This Online detection carried out by the designed battery detection system was compared with HPPC detection of the battery pack. It was found that the normalized internal resistance distribution of the two has high consistency. Meanwhile, the online detection method has low cost and simple operation. It is suitable for large-scale commercial battery for internal resistance consistency detection and does not affect engineering efficiency and battery life. The online detection method provides guidance for the life-cycle preventive safety detection of lithium-ion batteries.

Key words: power battery charge and discharge detection system, consistency, lithium-ion batteries internal resistance, incremental capacity, box-plot

中图分类号:

TM911

徐敏, 刘中财, 严晓, 黄碧雄, 王影, 王炯耿. 容量增量内阻一致性在线检测方法[J]. 储能科学与技术, 2019, 8(6): 1197-1203.

XU Min, LIU Zhongcai, YAN Xiao, HUANG Bixiong, WANG Ying, WANG Jionggeng. Online detection method for incremental capacity internal resistance consistency[J]. Energy Storage Science and Technology, 2019, 8(6): 1197-1203.

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容量增量内阻一致性在线检测方法

Online detection method for incremental capacity internal resistance consistency

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