Hybrid vehicles - a challenge for enrgy storage system

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Hybrid vehicles - a challenge for enrgy storage system

Büchel, Mathias / Gilch, Markus / Knorr, Rainer

Within the last years energy storage systems have been developed, fulfilling most of the requirements of Hybrid Vehicles. These are especially NiMh battery systems. But also Lithium batteries are convincing by its high power capability and high energy content as well as capacitors by its high power capability and cycle life time. Actually NiMh systems are on the market mainly installed in Japanese vehicles. However, Lithium and Double Layer Capacitor systems (DLC) are the upcoming solutions for future Hybrid Electric Vehicle applications. Siemens VDO automotive is intensively working on the introduction of Lithium and DLC energy storage systems for Hybrid Vehicles. Depending on the application, both systems are offering different advantages and disadvantages for Mild and Full Hybrids. The performance of these energy storage systems can be enhanced by balancing circuits or monitoring electronics. Therefore Siemens VOO has developed and evaluated solutions. These electronic devices support the introduction of the future energy storage systems into the automotive world enabling further emission reductions. In this paper conditions for the energy storage system such as used energy per micro cycle, maximum current, life time, ambient temperature, weight and volume are outlined. An overview is given about energy storage design criteria and electronics for energy storage systems.