[Joe_U698745]

What does "technologically updated 12 V battery" really mean? Lead acid batteries have been a stable technology for many years. Wonder if anyone can elaborate? Maybe spin for "we had a defective batch of 12V batteries"?

 

[2928]

What does "technologically updated 12 V battery" really mean? Lead acid batteries have been a stable technology for many years. Wonder if anyone can elaborate? Maybe spin for "we had a defective batch of 12V batteries"?

They’re already AGM, right? I mean that’s basically state of the art for Lead Acids, I think?

 

[ChristophW]

What does "technologically updated 12 V battery" really mean? Lead-acid batteries have been a stable technology for many years. Wonder if anyone can elaborate? Maybe spin for "we had a defective batch of 12V batteries"?

If I were to hazard a guess this is not so much about a better 12V battery, but more about better integration and management. The early ID3s already needed a software fix to keep the 12V battery charged, this might be step 2 to resolve the issue.

 

[VW TECHNICIAN]

If I were to hazard a guess this is not so much about a better 12V battery, but more about better integration and management. The early ID3s already needed a software fix to keep the 12V battery charged, this might be step 2 to resolve the issue.

Actually it was one of the modems that would never let EV sleep and bug in software that was not booting up DC-DC converter to recharge 12V battery when necessary.

 

[fireboy92k]

Actually it was one of the modems that would never let EV sleep and bug in software that was not booting up DC-DC converter to recharge 12V battery when necessary.

It's amazing how so much car tech is still firmly rooted in the 80's for basic technology. LOL Serial communications using modems, baud rates, etc.

 

[VW TECHNICIAN]

It's amazing how so much car tech is still firmly rooted in the 80's for basic technology. LOL Serial communications using modems, baud rates, etc.

There is simply no supplier or technology that can be implemented to work with 40V+ or higher.
Tesla is no different in this aspect.
But eventually it will move towards higher low voltages.
You simply cannot make everything in the house and meet demands and deadlines for EV.
Once competition heats up and more and more EV manufacturers demand higher low voltage DC modules to operate.
Power hungry electronics and higher speed chips to run at higher speeds require bigger 12V battery or more often for onboard DC-DC converter to recharge.

 

[fireboy92k]

Yeah, which is why I found the discussion some of us had in some other threads about Sandy Monroe complaining that we hadn't moved to 40V systems yet interesting, but a bit odd. It's a sea change for all manufacturers, and I suspect it will have to be coordinated through standards bodies like SAE, etc. first.

No single manufacturer at the moment can afford to pay every supplier the R&D they need to retool to 40V systems, all the way down to the chip manufacturers. And supplier diversity requirements make that even harder.

 

[Mark Magiera]

@Andy at Ross-Tech.com
What's the word Cap? Day 18.

 

[Andy at Ross-Tech.com]

@Mark Magiera thanks for asking but no updates from my dealer. I’ve been out inna woods being vewwy vewwy quiet so I’m not in a hurry to get the ID.4 back this week.

 

[JimmyVW]

@Mark Magiera thanks for asking but no updates from my dealer. I’ve been out inna woods being vewwy vewwy quiet so I’m not in a hurry to get the ID.4 back this week.

duck hunting? 🤣

 

[Andy at Ross-Tech.com]

duck hunting? 🤣

Let's just say I am doing my part to reduce the likelihood of an ID.4 getting damaged by hitting a deer. 🦌

 

[Andy at Ross-Tech.com]

Some good news:

1) There's one less whitetail deer threatening our roads (I saw way, way too many roadkill ones on my 900+ mile gasser roundtrip, mostly along I-81 in VA).

2) The Service Manager from my local dealer called yesterday to apologize for the delays and to let me know what's going on. I reassured him that I am only inconvenienced in a first world way (loaner Tiguan in place of leased ID.4) and am genuinely curious about the cause and solution to this problem. It sounds like they plan to drop the HV battery and replace these items, if I understood correctly:

SX8 High-Voltage Battery Control Module, Positive Terminal
SX7 High-Voltage Battery Control Module, Negative Terminal
J840 Battery Regulation Control Module

It sounds like the pyrotechnic disconnect that was supposed to only deploy in case of a collision, disconnected on its own for some reason. Those components are inside the aluminum battery frame as shown on page 32 of this diagram:

https://static.nhtsa.gov/odi/tsbs/2021/MC-10186407-0001.pdf

Fingers crossed for this doing the trick and I will keep you guys posted.

 

[hilld]

Some good news:

1) There's one less whitetail deer threatening our roads (I saw way, way too many roadkill ones on my 900+ mile gasser roundtrip, mostly along I-81 in VA).

2) The Service Manager from my local dealer called yesterday to apologize for the delays and to let me know what's going on. I reassured him that I am only inconvenienced in a first world way (loaner Tiguan in place of leased ID.4) and am genuinely curious about the cause and solution to this problem. It sounds like they plan to drop the HV battery and replace these items, if I understood correctly:

SX8 High-Voltage Battery Control Module, Positive Terminal
SX7 High-Voltage Battery Control Module, Negative Terminal
J840 Battery Regulation Control Module

It sounds like the pyrotechnic disconnect that was supposed to only deploy in case of a collision, disconnected on its own for some reason. Those components are inside the aluminum battery frame as shown on page 32 of this diagram:

https://static.nhtsa.gov/odi/tsbs/2021/MC-10186407-0001.pdf

Fingers crossed for this doing the trick and I will keep you guys posted.

Thanks for the link to that doc, quite interesting on how our batteries are built. I can see somebody hacking this in the future to replace the cells with higher density ones and increasing the range (once newer cells become available for reasonable prices).

 

[EV_Pro]

It sounds like the pyrotechnic disconnect that was supposed to only deploy in case of a collision, disconnected on its own for some reason. Those components are inside the aluminum battery frame as shown on page 32 of this diagram:

https://static.nhtsa.gov/odi/tsbs/2021/MC-10186407-0001.pdf

Interesting that the technical document (page 34) has the battery type listed as "prismatic". I thought all ID4s used pouch cells.

 

[Andy at Ross-Tech.com]

I'm pretty sure that SX7 and SX8 are the things that make an audible click from under the driver's seat when you get in and out of the car, negative terminal under driver's feet, positive terminal under passenger feet.

 

[JimmyVW]

Some good news:

1) There's one less whitetail deer threatening our roads (I saw way, way too many roadkill ones on my 900+ mile gasser roundtrip, mostly along I-81 in VA).

2) The Service Manager from my local dealer called yesterday to apologize for the delays and to let me know what's going on. I reassured him that I am only inconvenienced in a first world way (loaner Tiguan in place of leased ID.4) and am genuinely curious about the cause and solution to this problem. It sounds like they plan to drop the HV battery and replace these items, if I understood correctly:

SX8 High-Voltage Battery Control Module, Positive Terminal
SX7 High-Voltage Battery Control Module, Negative Terminal
J840 Battery Regulation Control Module

It sounds like the pyrotechnic disconnect that was supposed to only deploy in case of a collision, disconnected on its own for some reason. Those components are inside the aluminum battery frame as shown on page 32 of this diagram:

https://static.nhtsa.gov/odi/tsbs/2021/MC-10186407-0001.pdf

Fingers crossed for this doing the trick and I will keep you guys posted.

At least some route to resolution.
guess that is then also the reason why the main battery couldn't charge the 12V one and it drained over night or something.

Please take plenty of pictures if you get the chance

 

[Mark Magiera]

Learned something new (which I have no intention to seek): "Red turtle (absolute reserve mode)" (Pg 59)

 

[VW TECHNICIAN]

Thanks for the link to that doc, quite interesting on how our batteries are built. I can see somebody hacking this in the future to replace the cells with higher density ones and increasing the range (once newer cells become available for reasonable prices).

You will not benefit a lot from higher density without changing calibrations on BMS...both of them have to be done at once.

 

[VW TECHNICIAN]

Some good news:

1) There's one less whitetail deer threatening our roads (I saw way, way too many roadkill ones on my 900+ mile gasser roundtrip, mostly along I-81 in VA).

2) The Service Manager from my local dealer called yesterday to apologize for the delays and to let me know what's going on. I reassured him that I am only inconvenienced in a first world way (loaner Tiguan in place of leased ID.4) and am genuinely curious about the cause and solution to this problem. It sounds like they plan to drop the HV battery and replace these items, if I understood correctly:

SX8 High-Voltage Battery Control Module, Positive Terminal
SX7 High-Voltage Battery Control Module, Negative Terminal
J840 Battery Regulation Control Module

It sounds like the pyrotechnic disconnect that was supposed to only deploy in case of a collision, disconnected on its own for some reason. Those components are inside the aluminum battery frame as shown on page 32 of this diagram:

https://static.nhtsa.gov/odi/tsbs/2021/MC-10186407-0001.pdf

Fingers crossed for this doing the trick and I will keep you guys posted.

With what you posted this could lead to complete new pack....some engineers will do anything to get hands on entire pack and figure true problem that have caused this.

 

[VW TECHNICIAN]

And for some people who are not familiar with EV.
Onboard DC-DC converter needs this switches to be energized to preform 12V battery charging.
Example in sleep state EV will have positive and negative terminals not energized for various safety effects and for BMS to initiate other protocols when necessary to keep battery cells balanced and take appropriate measurements.