Battery condition monitor and monitoring method

摘要

A battery condition monitor and monitoring method uses known relationships between battery impedance, remaining capacity and remaining service life at different frequencies to detect remaining capacity and remaining service life. The monitor includes a computer for computing internal impedances of the storage battery from different frequency components of voltage and amperage signals from the battery, a memory for storing predetermined relationships between the internal impedance, remaining capacity and remaining service life of the storage battery for each of the frequencies and a device for determining the remaining capacity and remaining service life values for the storage battery in agreement at both or all frequency values derives from the computed internal impedances. The exact remaining capacity and service life of the storage battery are continuously monitored.