Battery Charge Management System (BCMS)

nickb2

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bmw almost limits, dont want info, up here we have one for disect. But now with this common cold natural selection deal. We have to go back to basics.

I wish beaver camp still existed.

Hello kids, bomb are commotion, come over here and hide under said desk. Trump is a joke, media is fire, and I am last resort when shyte hits the fan. It is my job. For now, shut up, and finance what u have, low time hole to make a $$
 

NickD

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Think how cheap that could need these things if they had an AC induction motor and a trolley. No need for a transmission, just reverse one of the phases for reverse. Has both huge torque and high speed running, reason why train locomotives are electrically driven, but do carry their own electrical generation. Trolleys were popular well before the introduction of the internal combustion engine.

Vehicle will just need a small battery to get you off the road into your driveway.

Another popular idea in the early 20th Century was the overhead monorail. No need for tires and thousands of miles of road that need snow clearing and constant maintenance, simple shroud over the rail will keep it dry. The land underneath could be farmed. Speed limits? None, bodies very light on these car, speeds in excess of 400 mph.

What do we have instead? A rubber tire on ice, not a good idea.
 

nickb2

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Well, sadly, I can only say today we got our diploma of presence for completing the first half of course, we got interupted by virus. Needed only one class to get it done, today, it got done.

But cant say when school will be back in session for good yet, teach was saying I dont know. Maybe sept, maybe oct. Anyway, half done, nothing new to say.
 

nickb2

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Today was just finishing up what we forgot . So was monitoring proximty and pilot circuit, trouble shooting them and finding ways to interpret when with a scope was useless. We even saw how to modify a tesla charging connector for j protocal with just a few resistors to charge any bolt new gen volt, soul, bmw etc list goes on. . ;)

Tesla sure is fun, but they suck in being compliant to industry standars, but hey, we will always find a way. :p:fixed:
 

NickD

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A Ford engineer finally came out and said hybrid vehicles up north are worthless. Trying to convert kinetic engine going down a hill to charge a battery going up the next hill is very inefficient at low temperatures. Could get rid of the hills.

Have energy saving nuts around here that do not drive hybrids like hybrids, but do brag they have a hybrid vehicle. Way before a stop sign, have to take your foot off the gas to get some battery charge. Doesn't work if you fly up to a stop sign and slam on the brakes, then slam on the gas pedal to take off again.

Next issue, any amount large storage of energy in any form is dangerous, latest is that huge lithium battery under your seats in a Tesla. Side impact, will short out the battery and will be just a tad short of a dynamite explosion, but you will be in a slower state being roasted alive.

Another factor for the government easy to put gas tax on a gallon of gas, but how about electricity. Add a huge electrical tax to everybody?
 

nickb2

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Well, dont have much to do today, my gf is on a 4 day loan to another care facility, so I am typing this again from her house, I had to come feed and take care of cat things.

In regards to battery management, I must correct Billr, some units do monitor each and every cell, but most do it in blocks. Again here, you will all have to bear with my poor translations. There are three different types of battery management units.

One which is not widely used is a unique master and in series monitoring using a voltage differential and is not very precise, hence not widely used.

Second one, more common, using slaves on cell blocks, reducing wiring in the entire HV battery.

Third one, which is my prefered one when diagnosing, is as billr wrote, a bms that actually monitors each and every cell.

The trend seems to be going for blocks sections rather than monitoring each and every cell, and I understand why they are doing that. It is probably for cost and also for easier block replacement.

Next year session (actually this year) who knows when, we will delve further into that. As of now, we have only taken out the battery with nasa suits on, and dissasembly but not have actually worked on the blocks themselves. That will come in second half of ev course when schooling resumes, if.
 

nickb2

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Of note, again, I must say bmw is the worst I have encountered in the scanner array. It is all over the place, way to many hidden functions, almost looking like tesla.

The most user freindly units I see are the volt and bolts.

In courses we looked at the bmw I3 (not the REX one) and found very limited data, but I did surprise the teacher by finding and option in the autel 9 series they have, much like my own. I found we could see the past five days of SOC (state of charge) which I find usefull as a tool to see how the CLIENT is using the car in regards to complaint on work order. None of the others have that option. At least none that I have seen yet.

The teacher was very interested in that, and stated he may include this in the revised edition of the next rendition of the course text books. The one we are using is a oct 2019 and he said it may not be updated for lack of funds with this covid thing.

I must say, I feel rather enthralled in being part of this at my age. It was fun to go back and see some of the guys at school. We were down to 6 guys. Wish we would see more women in this trade, but sadly, they dont tend to go for this type of stuff.

I also liked seeing Raffick and Pablo, they are funny to be with. And they stuck with it. Kudos to them for learning not only a newish system, but also for learning english and french at same time. A very big feat in my opinion and I salute them for that. Those are fictisous names, but raffick is a very smart guy, sometimes to the point of being annoying. But damn does that guy have a winner attitude.
 
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nickb2

Wrench. Diagnostic Tech.
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St-Hyacinthe, Quebec, Canada
The goal here I think is to reduce the amount of wiring and at same time giving the tech the ability to monitor the depletion on a particular cell block and giving us the ability to balance the units.

I am so very sorry I have not updated this thread more, and yes this is a disclaimer of sorts, we just got sideswiped by this pandemic thing, As alot of ppl here also.

So maybe after summer, I may have more interesting stuff to write. But most of what I write here is all on google is your friend. ;) And yes, I like the yellow tank top. :rolleyes:

 
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