Thoughts on my HV Cell degradation .....

[CaliPorsche]

So .... you may have seen my other thread here ... anyway the TLDR+ ... I got the red Circle of Death, Porsche Towed to Dealer ... sat for couple of weeks before dealer got to it, 12v battery drained mysteriously after a few days in dealer car park ... once they got to it they "jumped" the 12v battery and everything started up as normal and they could not see any codes for the HV battery issue (or whatever was the original issue)....

.... today I plugged in the VGate - and find this cell reading ..... any thoughts on this?

 

[WasserGKuehlt]

Doesn't look good, though I doubt you'll get the dealership to act on these readings. What I'd do is try @Vim Schrotnock algorithm to force the BMS to recalibrate at the bottom end: charge to full, drive/discharge to ~10% SoC, let sit overnight at that low state. Then charge again and re-take measurements.

 

[CaliPorsche]

Doesn't look good, though I doubt you'll get the dealership to act on these readings. What I'd do is try @Vim Schrotnock algorithm to force the BMS to recalibrate at the bottom end: charge to full, drive/discharge to ~10% SoC, let sit overnight at that low state. Then charge again and re-take measurements.

good point - i will see if can find the post.

 

[Johann55]

Please also post the screenshot with SOH and Battery Energy kWh

 

[Scandinavian]

Will be interesting to hear your results from BMS recalibration.
In your picture of the cell volatages , how long time had the car been standing idle?

Looking at your data about max and min voltage your cell deviations seem to indicate about 0.05 volt, which do not sound too hefty to me. I had a reading of close to 0.35 volt before my battery collapsed. But still something to keep an eye on!

 

[CaliPorsche]

To update you all on this …(I also need to post this news as an update to another thread elsewhere ….. but in the context of this post) …… before I could complete the BMS recalibration I got the red circle of death for the second time (first time thread here). ….so last Thursday 22nd Feb my 2020 4S was taken into the dealership after failing Wednesday
I heard last night that “they will be replacing three cells” and have ordered the modules from Germany …. I have not spoken directly to the service manager yet just to the receptionist so hopefully I will have more details soon……..

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