Internal short circuits in automotive lead batteries for safety applications, Part 2: predicting battery failure

Agenda for
5-9 September

Christel Sarfert
Engineer, Robert Bosch GmbH
The automotive world and applications are changing rapidly. In this context the lead battery has to face new challenges and to fulfill new use cases considering functional safety requirements. One of the most important changes and challenges is the application of lead batteries in the safety context and in varying Powernet topologies. In order to cope with these challenges, new functions for battery state detection have to be developed. These functions have to ensure the capability of the lead battery to deliver the necessary power for safe-stop manoeuvres at any time or rather to diagnose in time if this power cannot be supplied anymore. In addition, the functions have to fulfil the ISO 26262 standard for vehicle safety applications. Bosch has developed the necessary methodology. Based on worst case battery behaviour introduced in challenging laboratory experiments performed in cooperation between Clarios and Bosch, this presentation will show how the performance of those functions can be achieved. Using experimental data generated in different types of short-circuit laboratory experiments as already described by Clarios, we will show that we are able to predict critical conditions in a timely manner.


1996, University of Stuttgart

Diploma in Electrical Engineering

1996 – today, Robert Bosch GmbH, Bosch Battery Systems GmbH

Functional development and responsible for:

- Battery state detection for the 12V automotive lead battery

- Battery management system for the 48V Li-Ion battery

- Safety aspects of powernet guardian and 12V automotive lead battery

Author of numerous publications and patents