Electronics > Metrology

How to Measure Electochemical Impedance

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miro123:
  Hello,
I want to measure the electrochemical impedance of mid-size Li/LiFePO4 batteries - 20.....200Ah.
Does somebody knows the circuit to measure it. Any literature on this subject are welcome.

Thanks,
Miro

iMo:
FYI - https://www.sciencedirect.com/science/article/pii/S2352484720303103

miro123:
Thanks,
It is interesting article describing the basics. The modern manufacture manuals does not describe it.
I posted in metrology section because Solartron Analytical is an market leader in this area.

https://www.ameteksi.com/library/application-notes/solartron-analytical

https://www.ameteksi.com/-/media/ameteksi/download_links/documentations/library/solartonanalytical/electrochemistry/technical-report-06-introduction-to-eis.pdf?la=en&revision=6de3f288-6647-46f4-a102-e25a18beac0b&hash=D48D3BBFA26FE26E28A045AEF2860451

I'm not sure that I posted the topic in correct place. Does  the metrology section discus the modern equipment build from lets say Fluke, Keysight, Solatron or is only their old retro products?

mendip_discovery:

--- Quote from: miro123 on October 22, 2022, 04:19:22 pm ---I'm not sure that I posted the topic in correct place. Does  the metrology section discus the modern equipment build from lets say Fluke, Keysight, Solatron or is only their old retro products?

--- End quote ---

No, it is the right place. I just suspect it is a little specialised for just anyone to chime in[1]. I did a google and found some stuff but no more than you could. Most of the stuff I saw referred to test gear you could buy to do the testing and how to use their kit but not much on what that test gear is doing.

At times I suspect the borders between the sections here get blurred. For example, there are plenty of repair threads here and much talk about Test Gear.


[1] I know, doesn't usually stop them.

David Hess:
The major manufacturers of LCR meters and impedance bridges often publish an application note about how to measure impedance in the presence of a DC bias voltage or DC bias current.  This applies just as much to capacitors and inductors as to battery cells.  It is an optional feature on some LCR meters.

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