Battery advancements thread

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orbital

orbital

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General thread for battery advancements

Mid August 2020: Elon Musk is hinting on dramatic increase in battery capacity, saying 400 Wh/kg could be just 2~3 years away.
(hard to bet against a guy who can land a rocket vertically)

"so 400 Wh/kg would represent a significant hike for energy density in a battery compared to the cells now used in several EVs, which sit above 230 Wh/kg"
from: autoweek.com


Imagine a 21700 @ 8750mAh

_______________________________________________________________________________
Currently Tesla produces 4.75 billion 21700 cells per year, and that's going to increase
 
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"Imagine a 21700 @ 8750mAh "
Depends on the shape & size of the battery. It might have a lot of surface area for cooling, so shaped like an asterisk or something. How many Wh per cubic inch, when the battery is in a box?
 
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Tesla is going w/ 46x80mm cells or 46800 if that makes sense.
they are saying 5 times the energy & 6 times the power per unit of size.

think of 2x 46800 light possibilities,
something like a 2D Maglite on super steroids, really super steroids
 
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Is there a standard diameter of tubing that could fit 38mm cells?
Really hi amp batteries could support built-in fans for great cooling.
 
Obviously, for a company like Tesla that uses large numbers of cells in parallel, the larger the cell, the more efficient the use of packaging materials. For consumers, it's hard to see how a 46 mm diameter cell is going to be useful. It's simply too large to be put into a device that can be comfortably handheld by most people, and the dangers involved in catastrophic failure of a cell that large are not insignificant. The 21700 results in devices that are about 1" in diameter, and that's comfortable for even people with small hands.

I would argue that even a D cell is really too big in diameter for a lot of people, so I can see maybe a move to a about a 28 mm cell (about 1.125", which would end up with about a 1.25" ish grip size), but any larger than that I just don't see as being practical. Even at that size, it would really only be desirable in heavy-duty devices, not things most people are going to want to tote around. I think the 21700 is going to remain the mainstream standard for a long time to come. It's a good balance of power to size/weight/safety.
 
I agree with fuyume about 46800s. I think even if made safe they may be rather costly just to get a single cell and likely going to be pretty much nothing using them for awhile but I think that they may be great for tool batteries and things like lanterns and such..... maybe larger power banks, jump starter packs, inverter ammo, large bluetooth speakers etc.
May make ideal batteries for lawn mowers and large power hungry tools. Most likely these batteries will be unobtainable for awhile due to electric cars eating the supplies of them up. The one thing that could greatly encourage the use of them is a considerably lower cost per watt hour vs 18650 and 21700 cells plus perhaps higher power density.
 
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Similar to Tesla, BMW is going with a larger 46mm diameter battery for their EV line. Making them in two different lengths.
Also going with lithium-iron phosphate (LFP) construction.

It's all about faster recharging

www.autoweek.com

Why BMW Is Planning Tesla-Style EV Battery Cells

BMW plans to use Tesla-style battery cells—called 4680 by Tesla—in its new crop of EVs. But when will we see these in cars we can buy?
www.autoweek.com www.autoweek.com

Hopefully BMW includes a couple plug-ins
 
orbital said:
Mid August 2020: Elon Musk is hinting on dramatic increase in battery capacity, saying 400 Wh/kg could be just 2~3 years away.
(hard to bet against a guy who can land a rocket vertically)

Imagine a 21700 @ 8750mAh

_______________________________________________________________________________
Currently Tesla produces 4.75 billion 21700 cells per year, and that's going to increase
Click to expand...
And here we are, almost 3 years later with the typical LiIon cylindrical cells still struggling to reach 300 Wh/kg.
 
I always take such claims with a truck load of salt. manufacturers make them to bring more interests to their brand, and maybe affect a stock price, universities do so to get extra grants, donations. and the end result, over 90% of times those claims never materialize. Those who actually develop such break thru advances are keeping it quiet, industrial espionage is alive and well.
 
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