Discharge characteristics of 5 cell stack. After a single cell with an active area of 100 cm2 was manufactured according to the results of the above fundamental tests and then the performance of a single cell was checked, a 5 cell stack with same dimensions was constructed and subjected to a performance test. Current-voltage and current-power characteristics are shown in Fig. 9. The power at atmospheric pressure was 23 W at a current of 5 A, 79 W at 20 A and 123 W at 35 A, respectively, and characteristics at the higher pressure are expected to be improved. The performance of this 5 cell stack almost satisfies the specification of the fuel cell for the test bed. CONCLUSION The fundamental criteria for operational control of the 80 W fuel cell system have been clarified. It is said that the target of the fundamental test has been achieved. Hereafter, the functional test of the fuel cell system is to be performed by using the test bed equipping the 5 cell stack. The results of the functional test of the fuel cell system will be reported in the next chance. REFERENCES I. J.S. Fordyce, Technology Status — Batteries and Fuel Cells, Future Orbital Power Systems Technology Requirements, NASA CP-2058, pp. 157-166. 1978. 2. H. McBryar, Technology Status — Fuel Cells and Electrolysis Cells, Future Orbital Power Systems Technology Requirements, NASA CP-2058, pp. 167-194, 1978. 3. J.F. Been. The Role of Fuel Cells in NASA's Space Power Systems. NASA TM-79182, 1979. 4. R.E. Martin, Electrochemical Energy Storage for an Orbiting Space Station, NASA CR-165436, 1981.
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