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Investor Engineering Discussions
- Thread starter MC3OZ
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willow_hiller
Well-Known Member
If you look up the postdoc that performed the tear-down for the Limiting Factor, it looks like he's co-authored several papers with well-known battery researcher Shirley Meng: https://www.researchgate.net/profile/Weikang-Li-2
How many companies are able to bring new technology to market, such that experts in the field are simultaneously baffled and delighted about what they find while disassembling it? Tesla really does make alien technology.
How many companies are able to bring new technology to market, such that experts in the field are simultaneously baffled and delighted about what they find while disassembling it? Tesla really does make alien technology.
JRP3
Hyperactive Member
We won't know until we open the trunk... or tomorrow whichever comes first.
My "Hamster Boost" is installed in the Frunk, but he refuses to do Regen.
Not that it matters much, but the mid sized UPS/ FedEx delivery trucks are classified as walk-in vans and their bodies are primarily aluminium (on a third party chassis), though composite panels are getting more attention.
willow_hiller
Well-Known Member
First images of Munro & Associates disassembling their 4680 pack:
We'll know more once they post the full video, but for the moment I don't think it's possible to tell how much of the pack is cells and how much (if any) is structural filler.
We'll know more once they post the full video, but for the moment I don't think it's possible to tell how much of the pack is cells and how much (if any) is structural filler.
Big foam crush zones on the sides. Maybe the pack has less cells than shown at the factory tours? I think interior is mostly packed like the video.
For the Y, there are foam blocks between the carpet and pack, and the seats are on cross car rails. So there is minimal point loading on the cover. The pack foam supports the cover and there looks to be intermediate supports also.
Did everyone catch the point about the 4680 cells pointing downwards in the Munro video?
The LF 4680 year down showed that the bottom of a 4680 cell is electrically isolated, so it is a good bet that the top of the pack is the bottom of the 4680 cells, or the foam achieves sufficient electrical insulation.
It did see something peaking through the foam which might be electrical connections, hence waiting for confirmation here.
Either way it is a fair be that the top of the pack and the seat risers are not live.
Are you speaking of Cory's top down guess from the pack
That would go against everything we've seen in the factory tours and pack assembly video from Tesla.
The can bottom is isolated, but the side that wraps over it is not.
Yes, the comment from Cory is what I'm referring to.
The can bottom being isolated is a deliberate engineering choice there needs to be a reason.
it is possibly useful even if Cory's guess is wrong...
Visually from what I have seen so far, Cory is wrong... but I think that also means what the pack contacts the bottom of the car is not live.
The sides are live so, the sides can't be in contact with any structure you want insulated.
Cory was referring to the decision to mount the seats directly on to of the pack, and why more risk averse manufacturers would not do that.
I can see why he made the guess, and it wasn't a bad guess.
The can bottom is isolated because the sealing ring is non-conductive and there is no reason to add a process/ part to bond the bottom.
Cell bandoliers are placed in plastic holders, they do not touch the pack bottom directly.
The seats are mounted to risers which are mounted to the cross beam which appears to have its own sheet of flat steel (the data point I'm interested in), then the pack. Cross section is almost identical to a non structural car.
JRP3
Hyperactive Member
Yes, he's quite likely wrong. Electrical connections are on the top of the cell with the button in every cutaway and production video we've seen. Cory even saw the same thing at the GF Austin tour. No idea why he'd speculate the opposite.
It is unusal for the bottom of the can to be isolated, that could be a side effect or deliberate.
The pack is described as cells glued to top and bottom facesheets the plastic cell holders could create a gap for the bonding foam which is probably sufficient insulation.
So you are right the bottom being isolated looks more like a side effect.
The cell probably still needs to vent gases out of the bottom and electrically disconnect.
You will notice that the 2 connecting flowers are different colours and hence are made from different metal.i think that the bottom one is the silver one and that metal might have a lower melting temp.
JRP3
Hyperactive Member
It's deliberate. It seems they turn the can upside down from normal, cap and isolate the bottom, and punch in the positive top button with an insulator.
They are made from copper and aluminum to match the electrode foils.
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