In this report, a vehicle, which uses a power system combining an internal combustion engine with an electric motor and an electric energy storage device, is referred to as a hybrid vehicle. An energy storage device has been a biggest issue for the people who study electrification of automobiles. Vehicles driven by the electric motor such as pure electric vehicle, fuel-cell vehicle, and hybrid vehicle are being investigated and some of them have been already introduced to the market. However, the cost and the performance do not seem to be appropriately balanced enough to get the dominant position in the marketplace. The paper addresses this issue by introducing a new EDLC (electric double layer capacitor), including hybrid vehicle (HV) history with EDLCs, EDLCs potentials, and its applications such as X-by-wire, power assist HEVs, and wind generation. The EDLC development is still on the way like other batteries, but it has the possibility to be an alternative to batteries in this decade. Basically, an EDLC is suitably composed of two activated carbon electrodes, the paper separator having the function of short-circuit prevention between electrodes, and aluminium collector plate located adjacent to the electrodes for the purpose of collecting electric power. In this work, efforts were concentrated on the materials and the design of activated carbon electrode to achieve the target of larger energy density at a defined power density. As a result of these efforts, a 1500 to 3085 F EDLC cell was developed, where the energy density was 6.3 to 6.8 Wh/kg, almost double of the same kinds of current EDLCs, and charge/discharge roundtrip efficiency was 93 to 95%. An EDLC module was designed so that a 'parallel monitor circuit' was connected in parallel to each EDLC cell (RTCC). Compared with conventional parallel monitor, the main characteristic of RTCC is equally charging EDLC cell voltage during driving. It is clear that voltage dispersion becomes minimized with the effect of RTCC.
Potential of super power capacitor as energy storage
Potential eines Hochleistungskondensators zur Energiespeicherung
2006
27 Seiten, 33 Bilder, 8 Quellen
Aufsatz (Konferenz)
Englisch
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