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Old 10-27-2017, 04:27 AM   #1 (permalink)
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Toshiba claims EV battery breakthrough: 200-mile charge in 6 minutes

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Toshiba plans to bring the next-generation SCiB battery, with its new anode material, to market in 2019.


Toshiba Develops Next-Generation Lithium-ion Battery with New Anode Material | Business Wire



This could be the game changer...




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Old 10-27-2017, 05:13 AM   #2 (permalink)
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Quote:
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This could be the game changer...
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I'll be thrilled if/when they start mass producing the next generation of batteries!
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Old 10-27-2017, 06:41 AM   #3 (permalink)
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At ~3kWh per mile, that would mean the battery can take a charge rate of 600kWh in 6 minutes, or ... 6 megawatts? A 375v battery would be charging at 16,000 amps. Is my math wrong?

What would that even look like?
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Old 10-27-2017, 09:59 AM   #4 (permalink)
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Yes I believe your math is wrong unless you are seeing something I don't. Usually EVs only use a couple hundred wh/mile. The battery being discussed is talking about 320 kilometers using a 32kwh battery. That would be about 100wh/km or 160whr/mile. Charging is 32kwh in 6 minutes or about 5kwh/min. I didn't see the voltage level you spoke of so I don't know where you got that information.
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Old 10-27-2017, 10:07 AM   #5 (permalink)
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Quote:
Originally Posted by Ecky View Post
At ~3kWh per mile, that would mean the battery can take a charge rate of 600kWh in 6 minutes, or ... 6 megawatts? A 375v battery would be charging at 16,000 amps. Is my math wrong?

What would that even look like?
I think EVs are around 1 KWh for 3 miles. 225 - 350 W-H per mile is a common range from my reading. Even Jack Rickard's Electric Escalade used 'only' 777 W-H per mile.

So 320 km (from the article) is 200 miles. 200 miles / 3 miles per KW-h is 67 kw-h. 67 KW-h in 6 minutes is 670 kw-h in an hour, or a rate of 670 KW. At 375V that's 1786 amps. I think liquid cooling of the charging connector, charging cable, and battery pack are all required so that nothing melts!
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Old 10-27-2017, 10:40 AM   #6 (permalink)
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don't forget to add chemistry inefficiencies. 600 watts in does not give 600 watts out. So you could realistically see 2000 amps input

the ranger which is an aero brick uses 430 wh/mi
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Old 10-27-2017, 10:47 AM   #7 (permalink)
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Perket's law states the faster you charge or discharge a battery the less power you get.
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Old 10-27-2017, 11:17 AM   #8 (permalink)
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Said chart is for a 32 kwh battery, and shows it can do 320 km(200 miles) on what it can get in 6 minutes.

Assuming it can safely charge 80% of the battery in that time, like the other rapid-charging of lithium batteries (might even be 90%, looking at the chart's 12 minute and 30 minute charge times), 80% of 32 kw is 25.6kw.

I doubt we're at the point where you can get 7.8 miles per kwh. Or even 6.25, if it got a full 32kw.

But, assuming it could suck in 25.6kw in 6 minutes, that's 256 kw...at 375v, that's still 682 amps...and more with losses.

Hmm. That's a lotta juice. Not impossible, but pretty out there. They'd seriously need to boost the charging voltage to make it reasonable and efficient. Some day, they'll have to have EVs running at thousands of volts rather than just hundreds.
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Old 10-27-2017, 12:28 PM   #9 (permalink)
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I think the real problem isn't in the battery, it's how you get average (or below average) drivers to handle that much current without producing the occasional crispy critter.
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Old 10-27-2017, 12:39 PM   #10 (permalink)
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We are averaging between 4.5 and 5.5 miles per kWh, in 3 different EV's. So, that is between 182 and 223 wH/mile.

They might also be running a higher voltage battery.

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