To realize the reduction in size of a large-capacity battery device applied to a hybrid rolling stock and to improve the cooling efficiency and safety.
In the hybrid rolling stock, the secondary battery device is constructed by parallel connecting a plurality of units, each of which is composed of: a first connector formed by parallel connecting a first switching element 611 and a resistor 621 to serially-connected 108 unit batteries with voltage of about 7 V to obtain voltage of about 750 V at practical use level in the rolling stock; a second switch element 631 to which a diode 641 is parallel connected with reverse polarity; a third switching element 651 opposite in polarity to the second switching element, to which a diode 661 is parallel connected with reverse polarity, the above connector and switching elements being serially connected. The first to third switching elements are controlled according to a charging-discharging control signal Sb to charge and discharge the battery in the units.
COPYRIGHT: (C)2006,JPO&NCIPI
Eiichi Toyota
Motomi Shimada
Takashi Kaneko
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Shigeru Sasaoka