News for hackers. Stuff that matters.

A comment on Electric vehicle battery capable of 98% charge in less than ten minutes. Parent comment

Re:Electric vehicle battery capable of 98% charge in less th... by _ph_ on Tuesday June 14, 2022 @02:26AM (#31735395)
First, ultra fast charging is really relevant only for intermediate stops on long-distance travel. There you have dedicated charging stations which are directly connected to high voltage lines which can deliver 10-100 MW. Modern charging stations already deliver up to 350kw, doubling that power wouldn't be sci-fi.

But the peak charging rate is only one parameter and it isn't necessary to reach that in day to day usage. The biggest problem with current batteries is, that the maximum charge rate is good already, but only available while the battery is below 50% charge. So it isn't necessary to raise the maximum charge speed much, if this speed can be maintained for longer time. A battery which can take like 200-300kW till over 80% charge would be a winner and mostly "solve" recharging during trips.

[ Parent | on HN ]
Re:Electric vehicle battery capable of 98% charge in less th... by Reason077 on Tuesday June 14, 2022 @05:11AM (#31736427)
> ”Modern charging stations already deliver up to 350kw, doubling that power wouldn't be sci-fi.”

Not at all. In fact, MCS (Megawatt charging system) is already in development for charging heavy commercial vehicles. It’s designed to scale to charging rates as high as 3.75 MW!

https://en.m.wikipedia.org/wiki/Megawatt_Charging_System

[ Parent | on HN ]
Re:Electric vehicle battery capable of 98% charge in less th... by kube-system on Tuesday June 14, 2022 @02:34AM (#31735436)
Most batteries also degrade faster when charged at high rates. So at home, when you have the luxury of charging overnight, it’s better to charge slower.
[ Parent | on HN ]
Re:Electric vehicle battery capable of 98% charge in less th... by _ph_ on Tuesday June 14, 2022 @03:27AM (#31735805)
Right. And if you have batteries, which could take 700kW peak, but are only charged with 350kW peak, it is no longer "fast charging" in the sense of impact onto the battery.

But the big future is anyway to have the car plugged into a modest outlet when parking during the day so they can take up any excess solar power available on the grid and possibly even partially power your home over night.

[ Parent | on HN ]
Re:Electric vehicle battery capable of 98% charge in less th... by moonchrome on Tuesday June 14, 2022 @03:20AM (#31735752)
> Modern charging stations already deliver up to 350kw

Peak under optimal conditions ? Seeing how most stations fail to deliver on max charging claims I'd be sceptical we can realistically go so high without "lab like" conditions - available in 2 places in the world at 2 times so they can claim the number.

[ Parent | on HN ]
Re:Electric vehicle battery capable of 98% charge in less th... by _ph_ on Tuesday June 14, 2022 @03:28AM (#31735811)
Well, I was referring to the charging infrastructure and all current Tesla superchargers installed can deliver up to 250kW and Ionity here in Germany always installs 350kW chargers - that the battery of current cars cannot accept that for long or at all is exactly the topic why this new battery technology might be a big improvement.
[ Parent | on HN ]