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The inside of an EDLC supercapacitor

TechEkspert  Cool? (+6)
Surprised by the damage to the supercapacitor, I described the repair of the fault in the topic: Damage to the EDLC supercapacitor (RTC hold). Reading the answers, I learned from @bestler that this is a standard fault and I overestimated the durability of supercapacitors supporting the operation of RTC systems in relation to traditional batteries and disposable cells, e.g. CR2032.

@tmf pointed out that the EDLC can spill and destroy the PCB, @ritterx suggested that there are two series capacitors inside. We'll see what's inside the damaged capacitor.

We remove the plug with the leads, you can see the electrolyte and the contact to the capacitor inserted into the metal housing, it is a "push-in" connection without additional welding or soldering.


The plug on the other side connects to the metal housing.


In the housing there is another element in a plastic cover.


They are two capacitors connected in series. The housing resembles a button cell. There is a spring-loaded conductive pad between the capacitors.


It's exactly as you predicted, inside there are two capacitors that have leaked. It's good that the whole thing is in an additional housing.

I wonder if spercapacitors are used in a housing such as a button cell?

If so, you can easily confuse such a capacitor with a disposable cell or a battery (unless it has a meaningful marking on the board or a print on the housing).
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TechEkspert
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Comments

Anonymous 07 Feb 2023 20:25

Batteries are also made in button housings. Interesting solutions include Seiko Kinetic, where the TiCLi, TC920S battery cell is charged by a rotor-driven generator. [Read more]

1rycho 07 Feb 2023 23:25

I have replaced many such capacitors in Mitsubishi motor encoders. After several years of work, the inside of the capacitors looked exactly like the pictures. [Read more]

austin007 09 Feb 2023 19:20

They fail from hours worked (under voltage) or it doesn't matter if they are working or a lounger? How is the MTTF defined in the notes? Interesting demolition. [Read more]

TechEkspert 09 Feb 2023 21:23

This capacitor has failed during live operation (buffer power / RTC backup). [Read more]

Anonymous 09 Feb 2023 21:43

The supercapacitor differs from the classic one in that the electric charge is accumulated not so much on the linings in the area of the electric barrier, but spatially, and thanks to this, additional... [Read more]

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