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Re: Battery Ageing Model

Posted: Sun Feb 10, 2019 12:11 pm
by notfred
It has had a BMS reset, the CCC and CDC have dropped between the first and second samples. This was probably the dealer doing the updates for the firmware. You may find that the SOH drops back to what it was before.

I think you are overly cautious only charging at 6A, especially if you fast charge it at other times. If you think about when driving, 7kW is nothing.

Re: Battery Ageing Model

Posted: Mon Feb 11, 2019 8:18 am
by JejuSoul
notfred wrote:...I think you are overly cautious only charging at 6A, ....
I'm not so sure. The two cars on this thread that have the lowest deterioration numbers are the two that regularly charge at around 2kW. The sample size is too small to make any confident conclusion, but having a third car in that sample seems a good idea. I too am considering swapping out my E VSE that only charges at 32A to one that allows multiple settings (32A when I want to charge 'normally', and much lower when I am happy to let it charge all night or all weekend.)

Re: Battery Ageing Model

Posted: Mon Feb 11, 2019 1:11 pm
by ZuinigeRijder
Elmil wrote:The screenshot on the previous post made me check some statistics from my old 2015 Soul. The interesting numbers are the Max and Min Deterioration Cell numbers. They show Max det #2 and Min det #8.

My car had a change in deterioration numbers at 148 occations. The Min det was #8 in 76%, the Max det was #2 in 28% and 22% had both as above.

Coincidence..? Probably, but...


For me the max deterioration cells were mainly #1 till #6 and some #42/#43. The min deterioration cells were mainly #49, #59, #15

Re: Battery Ageing Model

Posted: Tue Feb 12, 2019 12:31 pm
by Oinq
notfred wrote:I think you are overly cautious only charging at 6A, especially if you fast charge it at other times.


This is the experience I had with my Peugeot iOn, on the iOn foruns there was some people doing this, and they had the lower deterioration.
Also on the iOn, deterioration was like a clock, it came down every 27 to 32 days, always the same amount.
In that Portuguese forum, people are very confident the heat kills the batteries.

I fast charge when/if I need to; on the iOn I fast charged 3 times in a year, I don't believe this is expressive for degradation.
If I need to drive more far away I take the Niro :)

In the moment I'm limited to my electric installation, I can't draw more than 10A from the plug where i'm connected, maybe this weekend I have the time to change the wires, and then I can go to the 28/30A the car supports. But I still plan to keep the 6A as my charging rule, higher if needed, but before raise the current I can increase the number of charging hours per day since I only charge about 5 hours; but with a short commute as mine I can have only 40% on Monday that the 80% will be caught up during the week. As an example I left the car yesterday in the garage with 54%, it charged to 69% this morning, I arrived home with 66%; so tomorrow morning will be close of the 80%

Well this is the plan, maybe you guys can show me I'm wrong and plans can be changed :)


Any spreadsheets someone would like to share?


Thank you for all the input
Nuno

Re: Battery Ageing Model

Posted: Sat Feb 16, 2019 6:46 am
by JejuSoul
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I have had two notable upward spikes in my deterioration numbers over the last four years. Both times the values initially spiked and inverted, but came back down again in the months afterwards. The Min and Max readings have not inverted any other time. Recently a German user has seen the same spike and inversion.

An old post of mine - Battery Ageing Model :- October 2016
I drove fast over the mountain 110km/h, decelerating hard before the speed cameras. Very unusual driving speed and style for my car.
Image

And another one - Battery Ageing Model :- April 2017
There was a spike up in my readings a month ago. It occurred immediately after driving fast 100km/h over a mountain.
The Min and Max reading initially reversed. This is the second time I have seen this in 3 years.
Both times were driving fast over the mountain.
It is something I rarely do, so I doubt this is coincidental.
Image

Am having a chat with German user ToyToyToy. His car has also shown the Min and Max reading reversed.
ToyToyToy wrote:Last week I was checking the values and was happy to see that Max-Det was 15.8%, which is almost the same as per end of December with 15.7%, although January was a bit cold over here (at night a few degrees below zero). Today, I was at a fast c harger (haven't been there for at least 2 months) and checked the values again: 18.3/18.3/18.4 (Max/Avg/Min). And yes, Min was higher than Max, which is very strange.
I was shocked to loose almost as much capacity as during the entire last year with 20,000 km. Hopefully, just the BMS is mis-calibrated and will recover after the next calibration.
JejuSoul wrote:...My conclusion is that driving very fast, or just fast up a steep hill causes high battery stress which can degrade the battery much faster than normal. This is not a problem if you only do it occasionally.
And yes I think the deterioration values on your car will go back down just like mine did.
ToyToyToy wrote:Now that you mention it.... just before I took the reading I was driving quite fast, 130-140 km/h, for 15 minutes or so, since we were late for an appointment. This probably caused the drop of the values.