Baseline for HV Battery SoH Performance

[Hirschaj]

@ciaranob updated readings for you...

Current SoH - 95.00%
Current Mileage - 11,487
0 new DCFC sessions since last update
1 charge to 100% since last update
20-85% is my typical SoC at any given time

@ciaranob updated readings for you...

Current SoH - 91.95%
Current Mileage - 15,067
0 new DCFC sessions since last update
3 charges to 100% since last update
20-85% is my typical SoC at any given time

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[ciaranob]

@ciaranob updated readings for you...

Current SoH - 91.95%
Current Mileage - 15,067
0 new DCFC sessions since last update
3 charges to 100% since last update
20-85% is my typical SoC at any given time

Great stuff - will update later today.

 

[rs38]

would be curious to gather some DC charging kWh energy numbers:
- ideally close to 0-100% SoC
- moderate / battery-saving max charging power to reduce the amount of uncertainty due to intense cooling while charing
- starting with >25°C to reduce the uncertainty due to battery hearting

e.g.:
3-100%, 81,3 kWh, 89% SoH ( if you know it)

 

[ciaranob]

@ciaranob updated readings for you...

Current SoH - 91.95%
Current Mileage - 15,067
0 new DCFC sessions since last update
3 charges to 100% since last update
20-85% is my typical SoC at any given time

Charts updated - looks like your car is heading towards more typical hot climate values - however I suspect if you do a 'cell balancing' procedure you might yet bounce back!

 

[rs38]

do a 'cell balancing' procedure

what do you mean with this? according to the Audi J1 SSP this done continously by the BMS

 

[ciaranob]

what do you mean with this? according to the Audi J1 SSP this done continously by the BMS

A number of members have performed a test whereby they run the car to les than 10% SoC charge back to 100% but do not leave it long in that SoC and run back down to sub-50% or even lower and then another charge back to 85% or more. Measured Soh before, during and after and many including myself have seen a 'recovery' of 1-2+% max. in Soh. We clearly know already that many factors can cause +/- 1% variations in Soh but this charge 'cycling' is just a way to re-calibrate or balance the full cell pack (at least that is the suggestion) to provide a better possibly more accurate current Soh (again, in respect the 'flash' OBDII measure of Soh).

My car recovered 2.2% after performing the above which is poss. the highest 'reset' I've seen and put my Soh more in line with other hot climate car data (albeit limited) - my car's trend from 7 prior readings was the worst in the database!

Here is my data (in red) on the chart:

 

[Scandinavian]

A number of members have performed a test whereby they run the car to les than 10% SoC charge back to 100% but do not leave it long in that SoC and run back down to sub-50% or even lower and then another charge back to 85% or more. Measured Soh before, during and after and many including myself have seen a 'recovery' of 1-2+% max. in Soh. We clearly know already that many factors can cause +/- 1% variations in Soh but this charge 'cycling' is just a way to re-calibrate or balance the full cell pack (at least that is the suggestion) to provide a better possibly more accurate current Soh (again, in respect the 'flash' OBDII measure of Soh).

My car recovered 2.2% after performing the above which is poss. the highest 'reset' I've seen and put may Soh more in line with other hot climate car data (albeit limited) - my car's trend from 7 prior readings was the worst in the database!

Here is my data (in red) on the chart:

Just to add to that in this post @Vim Schrotnock, explained what the technician advised him to do after some module replacement in the battery.

https://www.taycanforum.com/forum/threads/charging-to-100-why-not.18235/page-5#post-281690.

I think the Porsche centre did something similar after my repair since I have got some crazy SoH reports after 4000 km post repair. I am going to do the same exercise when time allows.

 

[Dee]

Thanks for reminding me - ever since Scandinavian shared this I have been meaning to put a link in Post #1 - will do later - excellent vid.

Currently I'm performing a 4 day charging test @ 0 to -5°C.
From SoC 45-70% (today).
Next days: from ~50-70% (~50 km)
Hopefully my SoH will go up too.

Normally I charge from ~20/30 to 100% (10kW) and only charge when I'm at ~20/30%.
With this test I charge every day and store for 3-4 days at a low SoC, which is better according to the vid.
Of course I'll update this thread.

 

[rs38]

they run the car to less than 10% SoC charge back to 100% but do not leave it long in that SoC and run back down to sub-50% or even lower and then another charge back to 85% or more

ahhh, okay. This can work.
I'd call that "BMS calibration", not cell balancing which is a completely different thing done inside each module.

 

[ciaranob]

ahhh, okay. This can work.
I'd call that "BMS calibration", not cell balancing which is a completely different thing done inside each module.

Fair enough - my bad - being somewhat loose with terminology !

 

[alexsas]

Turbo 11/2020 , MY2021

1) unknown
2) 93.7%
3) 36000 miles
4) very little DC charging - average charge rate seem to be c, 7kw across 36000 miles

don’t know much more as the car is new to me

 

[gtm]

@ciaranob. Some data to report. Drove from NJ to Florida and reported the car's numbers to this post. SoH was 92.33% at 7736 miles (you have posted this reading). The car sat for a couple of weeks with little driving and the SoH dropped to 90.93% at 7898 miles. This drop in SoH several weeks after a long road trip was consistent with what had happened when we drove North. Stats when the drop in SoH was noticed:
1) unknown
2) 90.93%
3) 7898
4) none since last posting
5) 12/2022

Ran the battery down to 10% and recharged to 50% (forgot the timer was set to 50% so didn't get a chance to charge to 100%). SoH improved to 91.57%. Ran the battery down to 6% and recharged to 97%. SoH is now at 92.58%. Current stats:
2) 92.58%
3) 8576
4) none since last posting

So the deep cycling of the battery does seem to improve the displayed SoH figure. I'm with rs38 on this effect. The BMS is getting to read the upper and lower limits of the battery and recalculates the SoH. Out in the real world I don't seemed to have recovered any range. GOM at 265 before and 265 after deep cycling.

 

[ciaranob]

@ciaranob. Some data to report. Drove from NJ to Florida and reported the car's numbers to this post. SoH was 92.33% at 7736 miles (you have posted this reading). The car sat for a couple of weeks with little driving and the SoH dropped to 90.93% at 7898 miles. This drop in SoH several weeks after a long road trip was consistent with what had happened when we drove North. Stats when the drop in SoH was noticed:
1) unknown
2) 90.93%
3) 7898
4) none since last posting
5) 12/2022

Ran the battery down to 10% and recharged to 50% (forgot the timer was set to 50% so didn't get a chance to charge to 100%). SoH improved to 91.57%. Ran the battery down to 6% and recharged to 97%. SoH is now at 92.58%. Current stats:
2) 92.58%
3) 8576
4) none since last posting

So the deep cycling of the battery does seem to improve the displayed SoH figure. I'm with rs38 on this effect. The BMS is getting to read the upper and lower limits of the battery and recalculates the SoH. Out in the real world I don't seemed to have recovered any range. GOM at 265 before and 265 after deep cycling.

Thx for sharing - totally in line with what I’ve been saying and indeed never mentioned anything about any range improvement, simply as stated, more accurate Soh readouts.

 

[gtm]

Thx for sharing - totally in line with what I’ve been saying and indeed never mentioned anything about any range improvement, simply as stated, more accurate Soh readouts.

Please don't think I am arguing with any of your conclusions. Just lending another voice to what you have been posting on this very long thread. Appreciate you collecting the data and just wanted to add another deep cycle experience that improved the SoH reading.

 

[SergeyIndy]

1) Delivery SoH = 99.95% (Measured July 1, 2023)
2) Current SoH = 95.12% (Measured Dec 10, 2023)
3) Current mileage = 3,000
4) Home charging at 11kW from typically 10%-15% to 85%
5) Build date April 2023

1) Delivery SoH = 99.95% (Measured July 1, 2023)
2) Current SoH = 93.85% (Measured Jan 11, 2024)
3) Current mileage = 4,061
4) Home charging at 11kW and 2 short 10 min DC charging sessionss since last reading
5) Build date April 2023

PS:

Launch Control Count: Interesting that the app showed the count of Launches the car has had. I have been attempting these but only once the screen actually lit up with Launch control graphics and the other two times it did not but it did go quick off the line but I was not sure if it was really launched. The count showed a total of 3.

Emporia EVSE Users: This EVSE has been working flawlessly since I just use a Timer function set for 8am with 85% target and plug in say 8pm on the night before with no interaction with EVSE. However, today I had to take my wife to the airport and I had to plug in around 9pm and set departure to 4am, and the EVSE and car could not complete Initialization phase. This happened to me before but I was not sure why, now I know, this is because the time between plug in and departure may be too short to reach target. This has to do with some protocol that Taycan and EVSE use that EVSE gets confused stating the car is not accepting charge and goes through a reset cycle that goes nowhere. The solution is to keep the Timer on but before plug in, enable Direct Charge for the first 5 minutes that gets the charging going and then just turn off Direct Charge in the App, then everything proceeded smoothly.

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