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nuckolls.bob(at)aeroelect
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 Posted: Thu Oct 08, 2020 12:31 pm Post subject: Some new battery chemistries on the horizon? |
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While lithium products are the fair-haired
children in the portable energy storage
sandbox, there's a couple of interesting
technologies being spun-up in the EV
world:
https://tinyurl.com/yy8cqwbe
https://tinyurl.com/y2ptgrjz
These MIGHT find application in aviation
and consumer products with some dispatch.
Contemporary EV batteries evolved up
from the smaller, less energetic
consumer products. These new kids
on the block will enjoy immediate
success and large scale production in
a particularly battery-intensive market:
EVs.
It seems likely that they could 'spill
out' into the consumer markets quickly.
It's intuitively easier to evolve-
down a product that's already enjoying
high volume successes.
We'll have to wait and see . . .
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Sat Oct 10, 2020 7:58 am Post subject: Some new battery chemistries on the horizon? |
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While lithium products are the fair-haired
children in the portable energy storage
sandbox, there's a couple of interesting
technologies being spun-up in the EV
world:
https://tinyurl.com/yy8cqwbe
https://tinyurl.com/y2ptgrjz
A follow up on the two articles I cited above . . .
Here's a more detailed description of the
tab-less construction of the proposed
cylindrical cell by Tesla:
https://tinyurl.com/y4vv7ozl
Some of you may recall a few years back
when a start-up in Golden Colorado called
Bolder Technologies was rolling out
an improved version of SVLA jelly-roll
cells.
https://tinyurl.com/y42v9ztj
We looked at these at B&C. Examples of
the 'Start Stick' made appearances at
OSH about that time too. Truly amazing
performance . . . when they worked.
Seems that one, and perhaps the most important
process to master was how to achieve good
electrical contact with the (-) and (+)
plates on each end of the jelly-roll. You had
to get hooked up to the entire length of the
exposed edges at each end. Failing that,
achieving a consistent. 2 milliohm cell
resistance was not possible. Degradation of
that connection resulted in rapid failure of
the cell.
The company folded in the US and I think
the idea was sold . . . perhaps a couple
of times . . . off shore. Haven't hear
anything about them lately.
Now, it seems that the smart guys at Tesla
have a different approach to getting a grip
on the edges of foils. This may signal a
quantum jump in cell performance. Cells
like that would allow folks like AeroVoltz
to achieve really BIG cranking currents from
their relatively small packages.
I recall a conversation with Skip Koss
(battery guru par excellence at Concorde)
wherein diminutive cells with good
cranking might be fabricated into a battery
module that would fit right onto the back
of a starter motor . . . zero-length
fat wires in the cranking circuit.
For our purposes, this would allow dual
alternator systems to drop distribution wire
sizes down to just system loads and take
the battery out of the operational power
loop.
Interesting stuff . . .
Bob . . .
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