Life cycle testing

Life cycle testing

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Life cycle evaluation of ultracapacitors is the subject of considerable industrial interest, especially in terms of elevated temperature conditions and power cycling. The authors have investigated ultracapacitor parameter changes due to electrical and thermal stress and have explored their aging characteristics. Ultracapacitor life can be evaluated under two different characterization methods: (1) power cycling where the unit under test is charged from zero to its rated voltage, then cycled from rated to half-rated voltage repeatedly and (2) d.c. life under constant voltage and temperature stress. When we speak of power cycling, we think of the current and voltage waveform are shown in the chapter, where the current is a quasi-square wave of discharge and charge such that the ultra capacitor voltage is maintained within its voltage window.

Inspec keywords: electric charge; thermal stresses; ageing; supercapacitors; life testing

Other keywords: quasisquare wave; temperature conditions; power cycling; thermal stress; electrical stress; voltage waveform; life cycle testing; ultracapacitors; unit under test; current waveform; aging characteristics

Subjects: Other power apparatus and electric machines

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