Varistors are disclosed which have desirable characteristics for providing voltage reversal tolerance in fuel cell stacks. Such a varistor is characterized by a high resistance at an applied voltage below about 0.95 V and a low resistance at an applied voltage above about 2 V, in which the high resistance is more than two orders of magnitude greater than the low resistance. The varistors can be electrically connected in parallel across the electrodes in one or more fuel cells in the stack. During normal operation, fuel cell voltage and current output are essentially unaffected. However, during a voltage reversal event, most of the damaging current is essentially shunted through the varistor.
VARISTORS FOR VOLTAGE REVERSAL TOLERANCE IN FUEL CELL STACKS
VARISTORS ASSURANT LA TOLERANCE EN TENSION EN SENS INVERSE DANS UN EMPILEMENT DE PILES A COMBUSTIBLE
2017-04-03
Patent
Electronic Resource
English
IPC: | H01C Widerstände , RESISTORS / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
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