Electronics > Beginners
Supercapacitor cycle life, myth or reality?
ZeroResistance:
--- Quote from: SeanB on September 24, 2018, 06:59:12 pm ---Supercap would prtobably be discharged to half the energy, so to 0.7 of the rated voltage, and also charged to 0.9 of the rated voltage, giving a big increase in lifetime. Thus they could do a million cycles, and under the same situation a lithium cell can also do 2000 cycles.
--- End quote ---
Now that's an amazingly profound insight. SeanB.
I guess that clears things up a bit :)
Rerouter:
Having had to deal with ab automotive product built that uses a super capacitor as its RTC backup instead of literally any normal coin cell,
I have to say when the tempaeratures or voltages get high, they die stupidly fast,
the device in question was running it at 5.2V, the enclosure was a sealed ABS box mounted inside a bus, so 55+ C was not uncommon,
Referring to the datasheet, life expectancy under those conditions, 500 Hours,....
It puffed up, and leaked after about 700 Hours. then hard shorted soon after.
spec:
I would only use supercaps for low current back up for memories RTCs and the like. The reason is that the servicing guys hate them because they are always failing and that has discouraged their use. The other thing is, unlike a silver oxide and lithium batteries, the terminal voltage is exponential on discharge.
Just my 2p worth :(
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