Method for monitoring the state of a battery in a motor vehicle

Abstract

This disclosure relates to a method for monitoring the state of a battery of a motor vehicle, with which method internal corrosion in the battery can be identified. In this case, the water loss from the battery is estimated by means of a model, and an evaluation unit generates an alarm signal if the estimated water loss exceeds a defined limit value. The water loss model provides, in particular, that the z-curve, which is used in the charging strategy of the battery, and the battery temperature are used, and the mass flow of the water loss on account of gas development is determined as a function of the used z-curve and the battery temperature from a correlation, which is stored in the evaluation unit, at least between the mass flow of the water loss on account of gas development, a z-curve of the charging strategy and the battery temperature.

Dependencies are inferred from the claim text.