Fireman, sorry but there is a lot of bad info in your video.
Never put water on a Lithium fire. 2 reasons:
1. Lithium + water is explosive
2. Water + hydrogen fluoride = hydrofluoric acid (skin melted. Attacks the corneas first)
co2 is useless on a Lithium ion fire. One of the gases vented...
It's obvious that you will dismiss any research that contradicts your erroneous knowledge as irrelevant or extreme. Despite proving you wrong at every turn, with evidence to back it up, you insist that you are still right. You have this delusion that you are smarter than all of these researchers...
"Just show me someone who is heating up a battery under one of these to show thermal stress."
"What about the sudo 'lithium build up'
... are you trying to make up science ?"
You.....do realize that Lithium batteries have Lithium inside them right? It's not just a catchy name. You also...
Your analysis seems to be consistent with what we saw in Mikes video, also consistent with various scientific research showing reduction in cycles due to mismatched cells. If some cells are discharging into other cells, then they are doing unnecessary partial cycles, thus will have reduced life...
Have you ever bought cells directly from the manufacturer?
I have. Twice they delayed because they were not happy with the matching
Sarcasm is only successful if you have the evidence on your side and the knowledge to present it logically. Otherwise you look like a fool
"So then you're saying the protection circuits built in to each battery, that you were saying we all throw out, doesn't actually do what it's supposed to in regards to preventing the fire? Interesting."
Correct. If you actually read what I said, the protection circuit prevents over charging...
You need to understand.
Thermal damage is progressive. A healthy cell does not explode unless it's an abnormal amount of quick abuse.
All these laptop fires occur because a small amount of damage is done each time. Eventually Lithium builds up on the separator and causes a short circuit.
All I know is that pack manufacturers match internal resistance. How closely? I have no idea. I bet they have very good test equipment that is highly accurate and only requires a single test. They also have millions of cells to match with, so that must make it easier
"there is no way it's going to dump enough current in to one cell to cause it to blow up"
This is exactly why the cells kept failing in Mikes DIY video.
Unless you have current monitoring of every cell, don't make those assumptions because current is dictated by ohms law.
I agree that Paul is miles ahead in his thinking.
3nerg3, You quote ohms law like you are the only one who understands it, yet you display a complete lack of understanding in your examples. Ohms law doesn't ensure even power distribution, it has the opposite effect. That's why protection...
Cells can go into thermal runaway due to high current, high voltage, thermal shock of only 80 degrees,or physical damage. The cells are not well designed. The packs are designed. Packs have protection circuits, which are thrown away along with caution.
If they are in parallel then voltage becomes a constant (for that point in time) and therefore is not relevant.
As Mike found out the hard way recently, if you put 5A into 20 cells you do not get 0.25A per cell. Yes internal resistance changes with soc, which is what makes it so dangerous. If...
That's funny. This forum is filled with comments like
"1A 4P is 250mA per cell. It's evenly split"
And nobody corrects them. So clearly nobody else here knows it's false. That scares me.
You cannot possibly have respect for the energy you are playing around with if you don't have the first...