METHOD AND DEVICE FOR DETERMINING A STATE-OF-HEALTH VALUE AND A STATE-OF-CHARGE VALUE OF A BATTERY

摘要

The invention relates to a method and to a device (1) for determining a state-of-health value SOH of a lead-acid battery (2), comprising an alternating voltage source or alternating current source (3), means for sensing voltage and current in accordance with phase, and an evaluating unit (4), wherein the evaluating unit (4) is designed in such a way that the evaluating unit determines the impedance from voltage and from current and determines the imaginary part (Z") therefrom as an evaluation quantity and determines an SOH value of the battery (2) by comparing the evaluation quantity with at least one reference value. The invention further relates to a method and to a device for determining the state of charge of a battery (2).