METHOD AND DETECTION UNIT FOR DETECTING INHOMOGENEOUS CELL PERFORMANCE OF BATTERY SYSTEM

摘要

The present invention relates to a method and a detection apparatus for detecting non-homogeneous cell performance of a battery system including a plurality of battery cells, the detection method comprising: a maximum cell charge resistance among cell charge resistances of the plurality of battery cells; determining a charge resistance ratio that is a ratio of average cell charge resistances of the plurality of battery cells, wherein a ratio of a maximum cell discharge resistance among cell discharge resistances of the plurality of battery cells to an average cell discharge resistance of the plurality of battery cells determining a discharging resistance ratio, when at least one of the charging resistance ratio and the discharging resistance ratio exceeds a preset threshold, determining that the battery system is in a degraded state, and the charging resistance ratio and the and determining that the battery system is in an undegraded state when none of the discharge resistance ratios exceed the preset threshold value. Here, each of the maximum cell charge resistance and the average cell charge resistance is determined corresponding to the charging currents of the plurality of battery cells, and each of the maximum cell discharge resistance and the average cell discharge resistance is a value of the plurality of battery cells. It may be determined corresponding to the discharge current.