Die Sicherheits- und Überwachungstechnik spielt bei der Entwicklung und Konstruktion eines Energiespeichers für Hybridfahrzeuge eine entscheidende Rolle. Dabei greift diese Technik auf der Ebene oberhalb der intrinsischen und konstruktiven Zellensicherheit unterstützend ein. Aspekte der Funktionalen Sicherheit (FSM, ASIL) sind integrativer Bestandteil einer Systementwicklung für Li-Ionen Batteriesysteme.

The Kyoto conference and the declaration of the IPCC climate report show that a change in mind is necessary in various fields of energy conversion. Lithium ion energy storage systems will give us the possibility to reduce significant pollution. Automobiles cause some major part of the CO2 emissions especially taking in mind that the number of cars is growing distinctly and that there is also general desire of mobility in all developing countries. This makes new concepts for reducing fuel consumption indispensable. Combinations of electric and fuel power improve total system efficiency and allow downsizing of combustion engines. But also solely battery powered vehicles are a possible solution to reduce the CO2 emissions. The bottleneck for hybrids and zero emission vehicles are reliable and safe batteries. Supervising electronic is essential part for safety of an energy storage system. Integration and serial connection of up to more than 250 lithium-ion cells is only possible with cell supervising electronic system. The battery management system controls current flow in combination with engine management system. Cell supervising circuit and software are part of the battery management system. The ASIL (automotive safety integrity level) classification which is identified by safety consideration lead to a comprehensive safety kit. The enormous content of energy as well as the high voltage of a lithium ion energy storage system has to be handled in case of failure. For that reason functional safety management (FSM) is mandatory during development process. Future generation of battery management electronic will include further functions of hybrid or electric vehicle systems. Imaginable are integration of DC/DC converter as well as hybrid controller. With these steps, further cost optimisation of hybrid- or EV-systems are feasible.