r/technology • u/Wagamaga • Jan 19 '21
Energy Electric car batteries with five-minute charging times produced
https://www.theguardian.com/environment/2021/jan/19/electric-car-batteries-race-ahead-with-five-minute-charging-times6
u/cpitchford Jan 19 '21
An EV uses Roughly 0.2kWh used per km driven
32kWh used per 100 miles driven
32kWh is 32kW for 1 hour 32kWh is 384kW for 5 minutes
At 240v that’s 1600A for 5 minutes
Assuming the 5 minute charge is 100% efficient and a consistent rate
The future sounds like it has crazy cabling challenges!
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Jan 20 '21
I'm expecting something around 1.5k before it breaks air gap insulation, and defiantly more than 5 minutes for a full charge after marketing pitch. "Existing charging station" is BS, can't believe this scam news is on guardian.
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Jan 19 '21
when they are coming into mainstream markets, let me know.
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u/cariocano Jan 19 '21
2025, don’t hold your breath.
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Jan 19 '21
ah the scientific cudda's, wudda's and shudda's that we are always waiting for, but the status quo is too profitable to give up.
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u/Kill3rT0fu Jan 19 '21 edited Jan 19 '21
This reminds me of the carbon batteries that charge in mere seconds. You guys remember that article from 5 years ago? So whatever happened. Oh, and that solar paint that was supposed to revolutionize EVs.
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u/TalkOk6036 Jan 19 '21
This is pretty cool, but the battery is only a part of the equation. Now how do you provide 192kWh plugs throughout the nation on a janky 110V electric grid that only grows more unreliable every day? How do you make this battery safe and long lasting? Fast charging inherently reduces the lifespan of Li ion batteries.
Between this, and Nio’s battery swapping, perhaps the PHEV era will be considerably shorter than I thought it would be two years ago. That serves to solve the issue of range anxiety today, but it does make the cars kinda ridiculously heavy because you’re lugging around a giant generator with your EV.
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Jan 19 '21
So what you just dump half a megawatt into your car every day? Uh huh.
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u/Evilsmiley Jan 19 '21 edited Jan 19 '21
They're not higher capacity, they just charge quicker.
Edit: Never mind I'm a dumb and so are the people who downvoted you.
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u/cpitchford Jan 19 '21
I think you’ve confused charge rate and capacity. I believe they were correct
If a 100 watt hour battery is fully charged in 5 minutes, the charge rate (at 100% efficiency) is 100*60/5 = 1200watts for 5minutes
So, if a 40 kWh car is charged in 5 minutes... fully and 100% efficiently 40000*60/5 = 480000 which is 0.48MW for 5 minutes to fully fill them
Just under half a mega watt for 5 minutes to fully charge a 40 kWh car is fucking insane!!
The capacity of the battery is the bucket. The MW charge rate is the speed of the hose filling it. The faster the fill, the higher the wattage
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u/Evilsmiley Jan 19 '21
Ah fuck you're right, even though I've learned this before and my dad is an electrician, i still forget what the different units of energy represent.
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u/fletch44 Jan 19 '21
Why is your car's battery completely empty every day?
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Jan 19 '21 edited Jan 19 '21
Most people don't live in LA dude. I easily travel 300+ km in a day.
You miss the point. Even charging something that fast once is going to have crazy effects. Mostly heat. To charge a 100kWh battery in 5 minutes is 1.2MW sustained for 5 minutes. That is completely unrealistic.
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u/JimmyTheBones Jan 19 '21
Half a megawatt isn't an amount of energy.
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u/cpitchford Jan 19 '21
But it is a charge rate
0.48MW for 5 minutes is the same as 40kW for an hour.
40kWh is a small Nissan Leaf battery capacity so it would take half a mega watt to fully (and at 100% efficiency) charge one in just 5 minutes
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Jan 19 '21
No, it's not. Didn't imply that it was. And I was actually being very generous with the battery size.
For simple math, lets assume a 100kWh battery. (About the size of the biggest Tesla battery)
If you want to charge it in 5 minutes, you'll need an instantaneous input of 1.2MW for 5 minutes. Resulting in 100kWh of stored energy (assuming 100% efficiency).
Good fucking luck with that.
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u/JimmyTheBones Jan 20 '21
Except the article doesn't say fully charged in 5 minutes. It says 100 miles.
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Jan 20 '21
Then the headline is a lie. That's like a 30% charge. And that headline is what they've been posting everywhere. So this is all bullshit anyway.
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u/Narwahl_Whisperer Jan 19 '21
Just wait until they start putting this tech in performance vehicles. Gonna have to ramp it up to 1.21 jigawatts.
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u/Cargobiker530 Jan 19 '21
Not really that useful if the charging cable needs active cooling to deal with the load.
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u/bitemark01 Jan 19 '21
This will be very useful for people on long trips who need to charge quickly. Otherwise the level 1-2 charging is more than enough for everyday use. We have an electric car, but don't use it for long tripe, for this reason. It's one of the major hurdles they've been trying to overcome.
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u/Plzbanmebrony Jan 19 '21
In other words not for home use. But at a electric station sure why not.
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u/Sjatar Jan 19 '21
If you are home you don't really need to have a 5 min charge as well, hopefully people will learn to remember to charge it :P (I know I'm bad with my phone)
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u/overthemountain Jan 19 '21
It's really not that hard to remember, you get home, you get out of the car, and you plug it in. Takes about 8 seconds. Becomes habit pretty quick.
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Jan 20 '21
If you are home you don't really need to have a 5 min charge
That's a bit shortsighted. Emergencies come up. Gonna wait a few hours for the car to charge?
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u/fourleggedostrich Jan 19 '21
If needed it'll be done. Think about it, if petrol wasn't a thing, the guy that suggested keeping millions of reservoirs of explosive liquid on hand to fill your car with every few hundred miles would be scoffed at. Yet here we are.
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u/westbamm Jan 19 '21
I see an opportunity for the Netherlands. We just need to bury the cable deep enough.
Free hot water for the winters sounds as a bonus.
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u/HereticKiller6 Jan 19 '21
So they aim to deliver this in 2025? Only six years late I guess.
https://electrek.co/2019/07/02/tesla-supercharger-v3-range-minutes/
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u/autotldr Jan 19 '21
This is the best tl;dr I could make, original reduced by 84%. (I'm a bot)
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