Service Campaign 9A4

I'm sure there's nobody at Hyundai with that job. Everyone there already has their hands full ignoring phone calls and emails.

 

Haha you are probably right. I just found this below which is very helpful understanding what exactly does Battery System Assembly replacement mean. This post is also for Cv trail runner if he sees this

THE BSA is around $8k part not 24k . See link and look up parts, for example BSA is part 37501-K4000AS The link below is a TSB for an older recall in June 2021

HMA TSB (nhtsa.gov)

 

I had my 9A4 recall as well as the T9E coolant exchange performed yesterday/today. They treated the coolant exchange as an actual recall even though only the 9A4 showed up as a recall in their online service appointment scheduler for my Kona. I dropped off the car @ 1030 yesterday but it wasn't completed until this morning. The note for the 9A4 on the Invoice was:

"performed recall 9A4 dtc inspection and bms update and photos uploaded to stui."

I believe some previous posts mentioned range changes after the update. I don't know if this qualifies, but when I dropped it off, the SOC was 47% and GOM read 131 miles. When I picked it up (according to the invoice, they had done a 3-mile test drive), it was SOC 36% / GOM 133 miles. Both AC/DC charge limits had reset to 100%, so I put them back to 80% and am recharging at home right now.

 

This was after charging to 80% - most definitely higher than before the update. Over the last 7 months after my driving changed from ~95% freeway to ~95% city, I've seen the GOM range at 205-215 miles after charging to 80%. We'll see what happens over the next few months after driving/charging cycles.

 

OK, my turn ... MY 2020 Ultimate -- Had 9A4 & T9E (battery Coolant change) done about 3 weeks ago. I finally had to do a full charge (I don't drive it much).

I don't usually charge to 100% but wanted to try that after this Campaign just to compare to previous. I got a whopping 326 miles @ 100% .. The most I ever got before this was 310 miles, and closer to 300 or LESS - and that was 1st year of ownership. The other thing I noted is that the individual cell(s) voltage (using my own ODB device) are all 4.18v now.. This is up from 4.16v.

The shop did both these service campaigns in about 6 hours. The Battery Coolant change took the longest - something about them need to "bleed" the system 5 times to exchange the coolant.

 

I was wondering why my Kona 22 showed an increase in range post this service campaign. I was excited yet puzzled as to how my battery range could be so improved. Be still my beating heart - it’s gonna go back to what is was, you say. Too bad.

One question - I’m kinda a noob - what’s the GoM? Could someone give me a quick brief on how it works? Would be helpful for a noob like me and my understanding of my EV. Thank-you


Sent from my iPhone using Inside EVs

 

GoM is "guess-o-meter", the math the vehicle performs when arriving at it's projected range figures. It takes into account historical driving behaviour including speed, acceleration, temperature and probably other factors. The Kona guesses have proven to be quite accurate.

 

Indeed, my Kona's range predictions have consistently been right within a couple percent, unless I do something it couldn't anticipate like climb a mountain.

 

Just had my 9A4 update done, took most of the day but I didn't really specify a time I needed it back. Charged the car that night and woke up to see it was charged to 100% and 305 miles est range. I guess my 80% limit I set was removed during the update. No matter, pleased with the whole process.

 

Hi, I just had the coolant change. Reading back I see some are seeing improved range after these updates etc.
Ignoring the GOM, I have noticed my trip to work now shows a trip figure of 9.5 kw/100. The trip home shows 8.7 kw/100. Its a flat course slightly up hill to work. I drive pretty calmly.
Pre the update it had always been over 10 for the trip into work and over 9 for the trip home. I thought maybe it was a one off but this now seems to be the standard figures I see every time. Pretty odd.

 

Those are numbers I’d like to have! Don’t think I’ve ever been that low, even in the summer. Went to Victoria and back today, about 120 km all on the highway and was very pleased to see 15.9 kWh/100km. Best I’ve ever done on backroads in the summer was around 11. Heading down to San Francisco for Christmas and doing my planning based on 18 - 20.

 

Hi DK, my trip is strictly 60km/h max and on the flat. Highway driving puts me in the teens too

 

I get just under 12kWh/100km on the dash driving locally 50 to 80 km/hr.

 

I received my Kona back about 2 weeks ago. The total wait to get the new main battery & have it installed was about 3 weeks. The technician at the dealership kept me posted via text throughout the process - kudos to him for that! (his name is Chance @ Hyundai Dublin, California)

Since I got the new battery, the car now consistently charges up to 310 miles. I haven't seen any abnormal behavior. Driving behavior is identical to before.

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The following is opinion only - I don't have access to any concrete data on the topic to back this opinion up:

Throughout this whole rollercoaster, my best guess as to what Hyundai has done to unlock the extra range (from 265 to 300+ miles) is to enable spare battery cells via the BMS update. From what I know, EVs always ship with some of their battery cells disabled - they're kept as spares and are enabled over time as other cells degrade and are disabled. I'm not sure why Hyundai would suddenly enable so many more cells to bump up our ranges by that far.

My one data source is this:
https://www.quora.com/How-are-Teslas-able-to-increase-the-battery-range-by-OTA-update-Beyond-the-restrictions-limit-they-put-on-to-extend-battery-life-how-are-they-able-to-do-it-just-by-software-update

 

Yeah, not really any chance of that. The cell architecture of 98S-3P is laid out in the service docs and is there no mention of any spare cells, nor is that idea even plausible from an electrical engineering perspective.

The practical and sensible way to offer different capacities is to narrow the usable voltage range within the maximum acceptable for the chemistry. LG Energy already limit that (per cell) from ~3.0 to 4.2 down to to 3.167 to 4.166 OCV to raise cycle life to an acceptable number of around 1200 full-charge cycles down to 80% SoH. Seemingly small changes make big differences to cell life.

The range is truncated slightly further to use about 96% of that (the difference between SOC BMS v.s. SOC displayed) possibly (but not proven) as a buffer to delay the drop from 100% of the parameter we see as SoH.

You have to use all the cells present to keep them in balance.

You can't trust the GoM to indicate battery capacity but rather have to carry out a capacity test. I did that twice on my original pack and came up with the advertised 64 kWh and 180 Ah.

 

I've charged my Kona to 80% twice more since the BMS update last month and the GOM range has, not unexpectedly, dropped from the 278 miles on the very first charge after update to 256 miles after this last one. One additional thing I have noticed is that the drop in range has increased noticeably when I turn on front defrost. Before the update, when I'd turn on the front defrost with temp set at 82F, the drop in the GOM was usually ~35-40 miles. After the update, the range drops ~60 miles. I thought I was imagining things the first time I turned it on, but it's been consistent.

 

That drop is crazy. That being said, what's with the 82°? Looking to melt the glass? Transporting orchids?

 

I guess I'm one of those people that believes the windshield will defog faster with the temp at max setting. Hehe. It doesn't normally get freezing cold here, so it usually takes just a couple minutes to completely defog my windshield in the morning which is right about when the resistance heater gets up to full temp. LOL.

 

The GoM figure is affected by results from recent driving history, and will thus vary quite a bit.

_H*

 

I've now had both updates done, and saw no change in range. But for me, range has always been good -- about the equivalent of 330-350 miles on a full charge