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CT scans of batteries

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21–30 of 76 posts

Re: CT scans of batteries

#21

The Tesla 2170 cell has a big hole down the middle of it... That seems like a missed opportunity for a watercooling pipe, or anything else to use that space effectively.

I somehow suspect water and electricity after a crash don’t mix well…

I mean, those batteries are liquid cooled anyway.

Re: CT scans of batteries

#22

The Tesla 2170 cell has a big hole down the middle of it... That seems like a missed opportunity for a watercooling pipe, or anything else to use that space effectively.

I haven’t read the paper, so I can’t comment on its merit, but it appears you’re not the first to have that idea:

Performance assessment of a passive core cooling design for cylindrical lithium-ion batteries https://doi.org/10.1002/er.4061

Re: CT scans of batteries

#23
post #17

Even in 2022, hijacking the scroll wheel still isn't cool or 1337.

I disagree in this case. Normally I'd fully agree with you but I think this animation style works really well given their use-case.

I did find it useful to scroll up and down with care to understand their annotations in detail.

Re: CT scans of batteries

#26

The Tesla 2170 cell has a big hole down the middle of it... That seems like a missed opportunity for a watercooling pipe, or anything else to use that space effectively.

Cylindrical cell life is limited by graphite expansion.

You can only have a roll that long before tension from anode expansion will start mechanically damaging it.

Manufacturers intentionally leave some free space to let the roll expand, and shrink

Re: CT scans of batteries

#27
post #4

No 4680 cells, its 2170.

Still very cool, and it shows the single tab connection that's the bane of old cylindrical cells that the 4680 solves. I do wish Samsung would already release some of them to the public ffs. Surely they can come up with a price that would beat what Tesla's offering for bulk and sell it on the open market.

No post body was provided.

Re: CT scans of batteries

#29
How doable (guess not) would it be to make a "gravity battery" ? A tiny but heavy balls are thrown from top and while passing thru thin channels they rotate some sort of mini-dynamo that creates electricity. Once all balls are on the bottom, generated electricity is used to rotate the whole thing and start process anew.

Anyone with a napkin can elaborate why this is not feasable?

Re: CT scans of batteries

#30

How doable (guess not) would it be to make a "gravity battery" ? A tiny but heavy balls are thrown from top and while passing thru thin channels they rotate some sort of mini-dynamo that creates electricity. Once all balls are on the bottom, generated electricity is used to rotate the whole thing and start process anew. Anyone with a napkin can elaborate why this is not feasable?

No need napkins for it. Because of friction and other forces the dynamo does not generate enough energy to lift the balls back up and have extra to be stored for other uses. In short, you use more energy to lift them than produced. If anyone could invent such a device, the world hunger and money wouldn't be problems anymore and we would be traveling to the end of the universe already.
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