RECALL) KONA EV - BMS UPDATE and 20% Reduce cell capacity

That is exactly what I would expect to see.

 

Where do I find the "build date" of mine? It is a MY 2020 that I purchased Dec 2019 ...

 

It will be on the manufacturer's label, driver's side door jamb.

 

The problem is that Hyundai seems to have no inventory of replacement batteries. Either that, or Hyundai is holding off any replacements until they get a go-ahead from corporate.

 

There is another issue here - there are far too many cases where the update is only partially applied. I don't know the details about the how/why, but it is a complicating factor. At best, it annoys the customers when they discover this - I suppose it is possible that cars may not be fully protected until the software update is fully applied.

 

It sounds like the update protects the battery from additional damage from fast charging. Cell damage is cumulative, it will be interesting to see how they handle battery replacements and if they have the data to predict previous damage.


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Is it fast charging that directly causes damage, or is it really just excessive battery temperature during charging?

Remember that one other thing in the BMS update that was fixed was that battery cooling wasn't working for some reason, which could lead to battery temperatures reaching 50C or 120F (or higher) during charging.

 

I spoke to the Hyundai tech that came to my dealer to fix my BMS update. He said that it is fairly unusual for four modules to need updating in one go, and that on their software, there's no way to have it do multiple updates in one operation, and at least one of the updates can appear all or partly off an area of the screen, so that the user needs to scroll down to see it.
However if it's really that simple, it's not clear why they appear to be sending specialist techs out to fix bad updates rather than providing instructions to the dealers to a) get it right first time and b) fix it if not done right.
It is possible that it's down to their internal admin procedures -it's been known for months that the "aux battery saver +" menu item not disappearing is a symptom of a bad update, but they've not amended the update instructions to get the service guys to check this after doing the update

 

And I have no doubt that there are many ( most?) cars that have had the update done incorrectly - it's been reported so often in forums, and that has to be a small proportion of users. At some point they're going to have to issue another service bulletin to check that previous updates have been done correctly.
All seems a bit of a mess.....

 

I feel you are correct, it would ultimately be temp that causes the damage, regardless of reason.


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Interesting. I have had this problem where they told me they did the BMS update but the aux battery + option is still in the cluster and the GOM was not reset so it appears that it was a bad update. Talking to them again this week to try to sort out. Hopefully they are aware of some of this stuff going on...

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Sample bias at play here: people who had the update done properly don’t come and complain on the internet

 

Thanks ... October 19, 2019 ... sigh .. :-(

 

On a side note our cars were built 2 days apart, cool

 

Post #5 here says that LG Chem supplies battery cells to HL Green Power, a joint venture of LG Chem and Hyundai Mobis, who assemble the cells into battery packs; Hyundai Mobis then supplies the BMS. LG Chem has denied a problem with their cells, and the issue could equally lie with assembly of the battery packs or with the vehicle's BMS. It could be a while before we find out.

 

That could be, but if they can get some faulty cells into the lab, they might be able to narrow it down. Once you have had a fire, the evidence is destroyed.

I believe the main point of the BMS change is for early detection of cells going bad so car owners will bring their cars in for service and have the battery replaced (if required).

 

At the same time, each of the four parties will be quite anxious to shift the ultimate blame, though Hyundai will wear it in the first instance.

 

The issue of who is ultimately to blame is sort of academic interest, but it doesn't really affect me one way or another. I suspect it is only a small number of cells that are actually faulty - this is just based on the relatively small number of fires (out of 77000 cars, there have been maybe a dozen fires). As the BMS update rolls out they will find a few more - no idea how many, and they will probably never tell us. Just from my pack alone, there was (apparently) only one bad cell out of the 96 total.

The #1 thing is really to ensure that there are no more fires.

 

Hi, I've just had my BMS updated, in South Aust as part of my 1 year service. I can confirm that it seems to have limited my range by around 20 %. I'm a bit furious.
They didn't mention a thing about that to me, I asked about the nature of the update and they said it was a recall safety issue.
I'm awaiting confirmation that they have now limited the capacity of the battery and then I will have a few quiet words to them about compensation and battery replacement.