METHOD AND DEVICE FOR MONITORING THE OPERATING STATE OF A BATTERY

摘要

The invention relates to a method for monitoring the operating state of a battery, preferably a Ni metal hydride or a Li ion battery, comprising one or more interconnected battery cells. According to the invention, during the charging and discharging of the battery a low-frequency alternating current signal or AC voltage signal is applied, the resultant voltage or current signal is measured and the operating state of the battery or the battery cells thereof is determined from at least one change in the harmonic fraction of the measured voltage or current signal.