This data is amazingly interesting. Lots of work too. Still, it seems to me crazy that owners need to dig this deep into the design. But thanks.
Just clarifying it says 4.166V for 100%. Are you referring to this? If so, that's a reference to the section 4.2.3 which is the original image posted. I saw 4.23 and assumed you meant 4.23V.
The higher the SoC the faster the loss. So storing your battery at 100% for a year will lose about 5%, sounds about right. That's why they say to store at ~40% if you're not going to use it.
Now this from GM - The Bolt and the Kona EVs uses different cell separators. So where is this info takes us? Both cars have HV battery related fires. So maybe the cell separator is not the source of the problem after all? Any guesses? https://motorillustrated.com/general-motors-says-bolt-ev-cells-importantly-different-from-hyundai-konas/70466/
Yeah I had kinda wondered the same thing. I suspect that it's something like dendrites. A poor separator can increase the odds of a dendrite breaching the separator, and the severity of it. So one problem is exacerbating the other.
News about the Ioniq 5 and the still unanswered question to Hyundai about the Kona battery issue/solution - not to mention my one-time use bolts.
Read the label on the back of the pack behind the suspension on the drivers side. It has manufacture date, part# and BMS ROM ID
.......................... Components in the LG electrolyte probably support the growth of dendrites which pierce the separator, regardless of which separator is used (in the LG batteries for the Kona or Bolt). Perhaps the SK Innovation batteries use different electrolyte components (e.g. in the Kia Niro EV).
Dendrite growth is a known, common problem with Li-Ion batteries. They are the "Achilles Tendon' of this design/chemistry. This problem is not unique to LG Chem batteries. Some electrolytes likely perform better than others, but no one yet published a list of winners and loosers. This is still grey science. The problem is that there are too many variables, like driving style, charging habits, climate etc....
Here is the image captured from the battery of my 2021 Kona. My car was not on the battery recall list, regardless it is sitting in the dealer's lot (with a new battery) since October 23.
.......................... Thanks. Is that photo the original battery label in your 2021 Kona, or a photo of the "new" battery label? You may have explained this in a different thread, but would you remind us why your 2021 Kona is sitting in the dealer's lot? If a new battery was installed after you bought your 2021 Kona, why was the original 2021 battery replaced?
Finally here is the answer from Hyundai. They will replace all Kona HV batteries in the US and in Canada. https://www.greencarreports.com/news/1131385_hyundai-kona-electric-battery-packs-most-expensive-ev-recall So it looks that I will get a second new battery? How about a new set of one time use bolts? It like waiting for my Covid 19 shots.
The photo is from the 'old' (original) battery. I was promised I will get one from the new battery - already installed - when they get the darn bolts to secure it properly to the car. Still waiting for four (4) South Korean 'one time use' bolts. According to Hyundai car is unsafe to drive with the original bolts reused. I don't want to bore you with the details. It is all documented above somewhere on this thread.
You can design the best cell separator in the world and poor BMS/charger algorithms can still burst the pack into fire in short order. Sent from my iPhone using Tapatalk
Yes, and I do not believe that either GM nor Hyundai had a bad BMS. It's just LG trying not to be financially on the hook.
No doubt about that.. Would actually be interesting if the details of what LG is talking about would be released.. It's not like the Kona is one of the faster charging cars.. The charging curve seems very conservative to me.. Let's not forget that some Teslas charge more than 3 times as fast..
LG Chem says it is not the Separators. https://insideevs.com/news/490950/lg-energy-solution-suspected-cause-kona-fires/