are you checking the SOH value when the car is charged fully to 100%?

also try the 2 pedal press after charging to 100% - think it should work on the ZE50 as well - it will erase all your previous driving habit and will re-learn again

 

Hello Zoe drivers,
I have a Zoe 50 R135 from march 2020 and 16000km.
Last year, SOH reported by CanZE progressively went from 94% to 75%(!) and I noticed a real impact on range this winter.
"Official" value wirelessly transmitted to Renault went from 97.5% last supper to 96.8% today which is much more realistic.
After multiple requests to my dealer, I finally got the ACTIS 64453 procedure applied (free of charge) last week.

• LBC went from v521 to 556
• LBC2 went from v521 to 550

The issue I have is that the SOH post update only jumped to 82%, far lower that what I expected.
It is possible that the BMS could need a few deep cycles to recalibrate ? Reading other posts I expected an immediate noticeable jump to almost 100%.
I talked with a Renault technician about this and he told me that that obtainted percentage could vary with the model of OBD dongle used by customers but that seems wrong to me.

When I had that BMS update done, on my now departed ZE50, it did take a couple of weeks of charging cycles for it to climb to 98% SOH. The tech at DSG Morecombe did tell me this at the time that it would take a couple of weeks. The range and miles per kwh also fluctuated wildly during that period.

 

software that changes what SOH is displayed, do just that.
The health of the battery cells is the same. you cant change ACTUAL health with software.

 

Thanks for your answers ! I will try the two pedal reset and monitor the SOH evolution in the coming weeks.

software that changes what SOH is displayed, do just that. The health of the battery cells is the same. you cant change ACTUAL health with software.

Yeah I know that, but is has an impact on the SOC displayed on the dash. And I want to be able to take advantage of the battery capacity I actually have without being limited by an lower than necessary limit.

 

I am sorry to say that this is incorrect. Before the BMS update the car would only let me charge up to about 47 kWh. After BMS update it let me charge to over 51.5 kWh. This was from CanZE data and the corroborated by rapid chargers which allowed more charge to be supplied to the car post BMS update. BMS update certainly increased real life range.

 

question is, what exactly defines the 47kWh and 51.5kWh, check the cells voltage at 100% before and after the update, you will find that the cells will likely have the same voltage at 100% charge. meaning that you didnt "gain" any capacity . its just being REPORTED different. software doesnt change the REAL ACTUAL capacity or state of health of a cell

 

Software indeed cannot change the real capacity of the battery.
But it may have difficulty in estimating this capacity, and therefore limit the driver's usable capacity too much by misjudging the depth of discharge window and preventing more charge/discharge than necessary.

In Little_discourage's case, checking the voltage at 100% before & after may not have been enough, as the problem may also be with the lower SOC buffer. Too much usable capacity may have been locked in this area due to the faulty BMS.

 

Hi everyone,
After 1 month, SOH is still stuck at 82%.
The Renault technician I spoke to tried to blame it on my OBD2 dongle giving wrong values but It's just reporting what the BMS is sending to It. Also the impact on range is definitely noticeable.
I'm still searching for the root cause

 

people worry too much with guessometers and BMS updates.

BMS update does NOT change your batteries health.
It might change the FIGURE it shows you by calculating it differently, but your battery has the exact same health regardless of what BMS you use, or what firmware it uses.

The car doesnt have that much of a "upper buffer". The cells go well past 4v. at 4v they're 97-98% charged

 

Of course, as I already said It doesn't change the "real" battery health.
The issue is that It limits more than necessary the amount of energy I can get out of the battery between the reported 100% -> 0%.
I experienced It multiples times via real world usage, and long term data history I have of kWh capacity available at 100% SOC.
Again, I totally agree that the REAL health of the battery is not impacted, but since the car uses the BMS to calculate how much capacity I can use, the impact on range is also REAL.
I wouldn't bother otherwise