HV Battery Calibration Procedure

[Falcon53]

Just did this. 21 GT 33,000 miles. Nov 23 SOH showed 100%. at 28,000 miles. This week SOH shows 94.5%. Let it rest 6 hours 71 degrees in garage. Took 10.5 hours to charge from 10-100%. Range of Ford Pass now shows 267 miles. Still waiting on final rest before checking SOH. Very seldom used DC fast chg and run between 50-80% levels. Never down to 20%. Thanks for the instructions on how to do this.

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[Snakebitten]

I'm one who would like to know more about the PID car scanner uses for SOH.
I'm certainly not going to obcess over it though.

In the short period of time I have owned the 2023.5 GTPE, SOH dropped once, significantly, and has since increased incrementally 3 times and seems to have settled. So whatever the PID is actually a measurement of, it IS fairly active. But I'm sceptical of it being more meaningful regarding the "health" of the battery VS other PIDs that are available to monitor.

But what I am convinced of is that the OP of this thread is in fact the best way to provide the BMS opportunity to measure and provide the values that I want to monitor.

Thanks!

 

[Falcon53]

I'm one who would like to know more about the PID car scanner uses for SOH.
I'm certainly not going to obcess over it though.

In the short period of time I have owned the 2023.5 GTPE, SOH dropped once, significantly, and has since increased incrementally 3 times and seems to have settled. So whatever the PID is actually a measurement of, it IS fairly active. But I'm sceptical of it being more meaningful regarding the "health" of the battery VS other PIDs that are available to monitor.

But what I am convinced of is that the OP of this thread is in fact the best way to provide the BMS opportunity to measure and provide the values that I want to monitor.

Thanks!

What got me curious was after two years the battery was still 100% so I figured gee we were doing pretty good with not over doing the charging. Then 7 months later we are down 5.5%. Then saw posts about OTA updates may be the cause. But Lee’s post interested me so I tried it. Not sure what to make any of this other than it made sense to me.

 

[Falcon53]

What got me curious was after two years the battery was still 100% so I figured gee we were doing pretty good with not over doing the charging. Then 7 months later we are down 5.5%. Then saw posts about OTA updates may be the cause. But Lee’s post interested me so I tried it. Not sure what to make any of this other than it made sense to me.

No change in SOH. Interesting.

 

[Falcon53]

More interesting if you divide 89.93/91 equals 98.8 which equates to the GOM drop from 270 mile range to 266 range now showing.

 

[ckt]

I did the procedure inadvertently after a recent road trip. My SOH was 85% pretrip, and now it's 90% post trip and procedure (34k miles standard batt).
Boy am I glad the SOH isn't a very accurate measure of battery health.
Maybe a better way to track degradation is to periodically measure pack voltage before and after routine trips. Even better if measured at similar SOC and weather.
Side note, I tend to keep my battery between 30%-70%. But after seeing SOH increase by 5%. I might change my habits to 25%-80%

 

[satpet]

I did the calibration, because I had a very low SOH at 88,5 after only 23563 km (14631 miles)
I brought the car to 5% SOC Display. In CarScanner I had 9,5% HVB SOC.
When I started charing something weird happened. The Display SOC jumped to 10% after one minute of charging.
During the last 1% from 99% to 100% my charger was still delivering 11 kWh during 30 minutes. This is approx 5kWh added (should be more than 5 % battery capacity) after that charging power went down and kept slowly charging for an extra hour. After that the car stopped the charging (no blue leds at charging port)
In total my charger added 92,26 kWh during the session. For a charge from 5 till 100% including charging loss this is a very encouraging figure.
But when I read the data with car scanner I saw still 89% SOH, but also 100% SOC, 96% HVB SOC and only 85,01 kWh energy left.
If I had really only 89 SOH i would expect only 81 kWh left (91 - 11%)
Is there something wrong with the car, or is the SOH reported in car scanner not reliable.

 

[Mach-Lee]

I did the calibration, because I had a very low SOH at 88,5 after only 23563 km (14631 miles)
I brought the car to 5% SOC Display. In CarScanner I had 9,5% HVB SOC.
When I started charing something weird happened. The Display SOC jumped to 10% after one minute of charging.
During the last 1% from 99% to 100% my charger was still delivering 11 kWh during 30 minutes. This is approx 5kWh added (should be more than 5 % battery capacity) after that charging power went down and kept slowly charging for an extra hour. After that the car stopped the charging (no blue leds at charging port)
In total my charger added 92,26 kWh during the session. For a charge from 5 till 100% including charging loss this is a very encouraging figure.
But when I read the data with car scanner I saw still 89% SOH, but also 100% SOC, 96% HVB SOC and only 85,01 kWh energy left.
If I had really only 89 SOH i would expect only 81 kWh left (91 - 11%)
Is there something wrong with the car, or is the SOH reported in car scanner not reliable.

Nothing is wrong, that’s just how those parameters work. You cannot run the battery all the way down to 0 kWh to empty, 0% will be like 2-3 kWh left.

The sudden jump from 5-10% when you started charging means the SoC was off that much. I suggest repeating the procedure again a second time to minimize that.

 

[Brons2]

is there anything to be gained by doing this other than the lie-o-meter being more correct? With our AWD standard battery I just assume around 150 miles at 70mph on a day with winds less than 10mph and that works fine. At 75 more like 135-140 miles.

Also not afraid to run it down below 5% as long as I have a general idea where I am stopping. I'm more aggressive with the EV than I was with a gas vehicle as I want to stay in the fat part of the charging curve as much as possible.

Think - an Out of Spec motoring trip.

 

[Mach-Lee]

is there anything to be gained by doing this other than the lie-o-meter being more correct? With our AWD standard battery I just assume around 150 miles at 70mph on a day with winds less than 10mph and that works fine. At 75 more like 135-140 miles.

Also not afraid to run it down below 5% as long as I have a general idea where I am stopping. I'm more aggressive with the EV than I was with a gas vehicle as I want to stay in the fat part of the charging curve as much as possible.

Think - an Out of Spec motoring trip.

It can get you up to 5% more available range if that matters to you. You'll be able to drive more miles before it cuts you off.

 

[satpet]

It can get you up to 5% more available range if that matters to you. You'll be able to drive more miles before it cuts you off.

That's indeed the reason. I'm planning a long trip this weekend. I have fast charging stations till 150km. But between 150 km and 360 there are none I'm allowed to use with my charging card (I will not explain. It's a long story of salary cars in Belgium)

 

[Neil4Real]

I didn't read the few pages here, but is there a setting in FDRS you can run at any battery percentage, then just charge to 100% and it'll calibrate properly or you have to do the run it low charge to full, etc. as explained in your OP?

 

[Mach-Lee]

I didn't read the few pages here, but is there a setting in FDRS you can run at any battery percentage, then just charge to 100% and it'll calibrate properly or you have to do the run it low charge to full, etc. as explained in your OP?

FDRS does not have a routine for that.

 

[satpet]

Nothing is wrong, that’s just how those parameters work. You cannot run the battery all the way down to 0 kWh to empty, 0% will be like 2-3 kWh left.

The sudden jump from 5-10% when you started charging means the SoC was off that much. I suggest repeating the procedure again a second time to minimize that.

I did it again and now my SOH went up to 92%. That is still not what I expect after 27000 km. I have the same usage and experience as mkhuffman .
At 100% HVB Soc Display i have 84,85 kWh left. HVB Soc is than at 96,68%
But 1 second before display SOC is at 100%, the HVB Soc reaches 100% and then Energy left is 88,25 kWh
Where is that difference from 88,25 - 84,85 kWh = 3,4 kWh gone?
Very very weird.

 

[mkhuffman]

I did it again and now my SOH went up to 92%. That is still not what I expect after 27000 km. I have the same usage and experience as mkhuffman .
At 100% HVB Soc Display i have 84,85 kWh left. HVB Soc is than at 96,68%
But 1 second before display SOC is at 100%, the HVB Soc reaches 100% and then Energy left is 88,25 kWh
Where is that difference from 88,25 - 84,85 kWh = 3,4 kWh gone?
Very very weird.

I have noticed that also. I think the reason the kWh drops after the charge finishes is due to the way the BMS does the estimate. It is not perfect, and an approximation anyway, I think. Doing the recalibration can help get the BMS a more accurate reading.

I may need to do the procedure again myself, although I charge to 100% every week or two. It seems that should keep the BMS accurate, but maybe not. The SoH of my battery is now showing 88.5%. Grrr.

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