Online detection method for incremental capacity internal resistance consistency

doi:10.12028/j.issn.2095-4239.2019.0102

Abstract

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

CLC Number:

TM911

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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