An engineering method for detection of problems of lithium iron phosphate batteries

doi:10.19799/j.cnki.2095-4239.2021.0437

Abstract

Abstract:

Lithium iron phosphate batteries (LFP) are widely used in large-scale battery energy storage systems. To improve the operating performance and ensure the safety of the battery system, people urgently need an on-site fault diagnosis for inconsistent cells that is engineered to be fast and accurate to support the rapid diagnosis and maintenance of the system. In this study, an algorithm based on battery charge and discharge characteristics is proposed to realize the classification of inconsistent cells by multiple-outlier detection. On this basis, the battery deviation capacity is computed and used as the optimization coefficient to prioritize the difficulties, which brings great ease to engineering operation and maintenance. Practical results show that the proposed method has the characteristics of high identification accuracy, simple parameter adjustment, and low computational complexity, which makes it suitable for on-site engineering and has important guiding significance for the maintenance of energy storage power stations.

Key words: on-site monitoring of energy storage power stations, lithium iron phosphate battery, Gaussian distribution model, Grubbs test, optimization coefficient

CLC Number:

TM 911

Shangyu ZHAO, Zhen ZHANG, Baoyuan WANG, Quhu ZENG. An engineering method for detection of problems of lithium iron phosphate batteries[J]. Energy Storage Science and Technology, 2022, 11(2): 643-651.

Figures/Tables 17

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Table 1

Specific parameter configuration during engineering application testing"

参数	值
$σ$	2.800
$V_s 1$	3.099
$V_s 2$	3.500
$V_s 3$	0.075
$V_s 4$	0.075

Table 1

Table 2

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序号	簇	问题节点	问题类型	问题建议	优化系数	最大上压差/mV	最大下压差/mV	开始时间	结束时间	当前状态
1	3箱1堆1簇	5号单体	短板	建议直接更换	2.64	176.1	305.9	2021/7/19 0:00	2021/7/20 0:00	待处理
2	3箱1堆1簇	48号单体	SOC下不齐	无短板趋势类均衡	-1	-8.7	259.3	2021/7/19 0:00	2021/7/20 0:00	待处理
3	3箱2堆3簇	211号单体	短板	建议直接更换	2.22	152.1	279.9	2021/7/19 0:00	2021/7/20 0:00	待处理
4	3箱3堆4簇	98号单体	短板	建议直接更换	2.27	74.4	214.5	2021/7/19 0:00	2021/7/20 0:00	待处理

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