METHOD AND APPARATUS FOR DETERMINING THE STATE OF BATTERIES

摘要

The present invention relates to a method and a suitable apparatus for determining the state of a rechargeable battery and for checking contact resistances in a battery system. According to the invention, an impedance curve is determined using signals at different frequencies and a value for an area, which results from the impedance curve, is then calculated from a predetermined threshold value and an x axis. The value for the area is a measure of the ageing of the battery. A control signal is generated on the basis thereof. In one preferred embodiment, said control signal is used to drive a signaling apparatus and thus to present the state of the battery to a user. The present invention can be used, for example, in motor vehicles that are electrically driven.

主权项

1. A method for determining the state of a rechargeable battery and/or the quality of contacts, wherein a signal with at least two different frequencies is applied to a battery,
hereby characterized in that a first impedance value is determined for the first of the at least two frequencies, and a second impedance value is determined for the second of the at least two frequencies, on the basis of the determined impedance values, an impedance curve is determined, which can be represented in a coordinate system with an x axis and a y axis, a threshold value is determined, which corresponds to a determined x value, a value for the area is calculated, which results from the impedance curve, the x axis, and the threshold value, and in that a control signal is generated as a function of the value for the area.