JejuSoul
Posts: 1667
Joined: Wed Jul 08, 2015 6:47 am
Location: Jeju
Contact: Website

Re: Analysis of a replacement battery.

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It is now 2 1/2 years since I had the battery replaced on my white 27kWh 2015 Soul EV.
On December 30th 2019 the car had driven 86,993km before getting a new battery.
On June 18th 2022 the odometer reads 126,379km. That's 39,386km on the new battery.

Here's the latest Torque reading

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The new BMS does not show the same deterioration data as the original.
At the last service two weeks ago the SOH was 100% 'as expected'.
Although perhaps I shouldn't be so optimistic - see below for discussion on my original car.

Here's the navi display when last charged to 100% SOC.

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Although after 39,000km my blue 27kWh 2015 Soul EV was just beginning to lose the 'early year's buffer' and occasionally show a reading lower than 100% at this stage. The new algorithm for the BMS offers no way to determine the buffer size.
If the 'early year's buffer' is 10% of the battery's capacity and the warranty is 70% of useable capacity,
then the 160,000km warranty limit will be reached at 40% loss of real capacity.
Hence if the deterioration loss is linear the battery will lose 10% each 40,000km.
That is what happened on my blue car and may be what is happening with the new battery.

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Both of my cars are 7 years old. Both went in for annual service recently, and both had their transmission oil changed.

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The blue car has driven about 94,000km and still has the original battery. The official KIA estimate of SOH is 94.9%.
I will make a report about this car on the Battery Ageing Model thread.
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The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.
ksoul2084
Posts: 161
Joined: Thu May 16, 2019 10:48 am

Re: Analysis of a replacement battery.

That is simply amazing to me.

I had my battery replaced almost two years ago and my range is rarely much more than 100km on a full charge (2016).
Granted, I'm often driving on the highway at 115km/h, but I've never enjoyed the so called 150km+ range that others have frequently mentioned.
JejuSoul
Posts: 1667
Joined: Wed Jul 08, 2015 6:47 am
Location: Jeju
Contact: Website

Re: Analysis of a replacement battery.

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Here's the latest charging profile of my replacement battery.
I don't charge to 100% very often.
Compare this with Previous charging profile.

Image

This is a 28.8A charge from 19.5% SOC to 100% SOC.
It took 4 hours 13 minutes to fully charge.

Note the energy added is equivalent to a useable battery capacity of 30.09kWh.
The final resting voltage at 100% SOC is 397.2V

There's a small vertical jump in the SOC line at the end. I think this jump in SOC is purely because I don't charge to 100% very often and the BMS doesn't know exactly where 100% will be.
The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.

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