Performance characteristics of high reliability double layer capacitor components

Performance characteristics are presented for double-layer capacitors specified by DESC drawing 92001 and manufactured by the Evans Company. Evaluated capacitors passed all specified environmental and physical tests. A cycle-life test of 400000 charge discharge cycles was completed. The largest capacitance change was 29%. It occurred at the maximum rated temperature. Insignificant changes were observed in the equivalent series resistance (ESR). An aging study conducted using a five-level, two-factor experimental design showed the effects of temperature, voltage, and time on capacitor properties. After 12000 test hours, the largest capacitance change was a 30% decrease. It occurred at 40% of the rated voltage. ESR was stable throughout the investigated parameter space. No failures were observed during more than 500000 part-hours of testing