Novel Auxiliary Diagnosis Method for State-of-Health of Lead-Acid Battery

A novel auxiliary diagnosis method for state-of-health (SOH) of a lead-acid battery unit is proposed in this paper. This method is based on the concept that the discharging curve for a health battery unit is smooth, however, the degradation of battery unit caused by the internal cell shorts, shorted cells open or the cell reversal will distort the discharging curve. Some experimental results are carried out to verify the proposed SOH diagnosis method. The experimental results show that the proposed method has the expected performance.