Analysis of Characteristics for the Identification of Lead-Acid Battery Technologies used in Micro-Hybrid Vehicles

Due to advanced fuel-saving features, used in micro-hybrid vehicles, stresses on automotive batteries have significantly increased. To ensure a safe operation and avoid overloading the battery, its state has to be monitored constantly. However, due to the availability of different technologies of leadacid batteries with distinct behavior, for a correct state estimation the battery type has to be known by the system. In this work, lead-acid batteries of different types and from different manufacturers are tested to find differentiating factors that can be used for on-line identification. This includes the analysis of both transient stress phases like starting the engine as well as rest periods. From the results of these tests, characteristics for the three battery types can be derived based on which identification can be performed.