Dong Liu
ABSTRACT
The state of health (SOH) of lithium-ion batteries is a comprehensive evaluation index of battery aging. The characterization and estimation of battery health status is the key technology of the new generation battery management system. Since the SOH calculation of lithium batteries is affected by the comprehensive factors, the calculation of SOH has become the focus of research. In this paper, the capacity increment curve (IC curve) of 18650 lithium iron phosphate battery was used as the analysis tool. The numerical analysis method was used to analyze the variation of IC curve characteristic peak with battery aging. It is found that the peak-to-peak capacity of the two features in the IC curve has a certain relationship with the total capacity and remains unchanged. Based on this, a mathematical model was established to calculate the relationship between the capacity and the total capacity of the characteristic peaks. When the SOH of the group battery is estimated, the capacity of all the single cells in the battery package was calculated one by using the relation coefficient, and compared with the actual capacity calculated by the SOC-OCV curve, the maximum capacity error is 3.86%, thereby accurately estimating the battery capacity of the group and its SOH. This method also has important reference value for the study of group battery consistency.
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Index Terms
- Research on SOH Capacity Analysis Method of Grouped Lithium Batteries Based on Capacity Increment Curve
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