The application of electrochemical storage devices in advanced vehicle systems requires new battery technologies to fulfill the enhanced mission profiles e.g. start-stop, recuperation at the 42 V level. Modern thinking favours initial introduction of the 42 V power net with integrated starter technology ('ISG Basic') coupled with the exclusive use of valve regulated lead-acid batteries with absorptive glass mat (VRLA) in both flat plate application and spiral wound technology. With the successive change from a 14 V / 42 V dual voltage system to a single 42 V power net, the spread of 42 V components will demand a specialization on different ISG optimization scenarios. With a focus on fuel efficiency ('ISG Economic') the use of Nickel-Metal-Hydride batteries (NiMH) will become a viable alternative to the lead-acid technology while an optimization in the direction of comfort consumers such as infotainment ('ISG Comfort') will favour a high specific energy solution with Li-Ion technology. This analysis of future battery requirements also clearly reveals that the storage device's status will also need to be constantly monitored. This requires, in addition to the technical aspects, a definition which is valid for all situations and a linkup of the status parameters SoF (state of function), SoC (state of charge) and SoH (state of health). Furthermore the optimization of both specific energy out- and through-put will require an active control of the operational window of the electrochemical system. Defining the mission profiles of advanced batteries at 42 V level includes at this state of discussion in automotive working groups the definition of elevated energy-throughput (at both enhanced frequency and higher depth of discharge), boost and recuperational power efficiency. In parallel to the discussion on the enhanced electrical mission profile, automotive working groups like the MIT consortium focus on safety relevant issues concerning both power management and disconnect sensing to avoid side effects on a 42 V level. This paper focuses on the key functions of the new powernet and defines the capabilities of modern battery technologies. Both single batteries and combinations of different battery technologies are presented and evaluated regarding cost and weight. First design verifications of 36 V VRLA are shown, data sheets of 42 V NiHM and Li-Ion batteries are presented.
Battery systems for the 42V PowerNet
Optimization of the Power Train in Vehicles by Using the Integrated Starter Generator (ISG) ; 174-187
2003
14 Seiten, 12 Bilder, 5 Quellen
Aufsatz/Kapitel (Buch)
Englisch
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