I suspect they are using LiFePO4 cells as they tend to have low internal
resistance.
10C is no big deal these days, believe it or not.
The Formula One A123 Systems cells, designed for use in the F1
kinetic energy recovery system, (KERS) that I had in the Killacycle
were LiFePO4 and would discharge at ~500C. These 18700, ~1.5 A-hr cells
would withstand a 500+ amp discharge until they were completely flat.
Keep in mind, this was 20 years ago. Cell technology has FAR exceeded
this now.
I never tested the max charge rate, but I expect it to be at least
1/4 of the discharge rate, likely closer to 1/2. Maybe 200C or more. 50C
would be like water off of a duck's back.
The main limitation to fast charging is the charger and the charger
cord. Not the cells in the car. The charger no doubt has some sort of
associated battery bank to even out the peak load on the grid. Wouldn't
surprise me if it the same battery they are using in the car, or perhaps
the same cells.
The charger cord is most certainly water cooled. When you get much
over 50kW the charger cord has to be water cooled because the wire gauge
gets too big to handle and the temperature gets beyond what is practical.
Bill D.
On 3/19/2025 3:25 PM, EV List Lackey via EV wrote:
Chinese automaker BYD claims to have developed an EV battery that can charge
at a full megawatt. They also say they'll build a Chinese network of 1mW
chargers for their cars fitted with the battery.
The cells can accept 10C (10 times the amp-hour capacity expressed in
amperes) and the battery is 1000 volts nominal.
BYD EVs using the battery will be able to add 400km (!) of range in a 5-
minute charge.
https://insideevs.com/news/753913/byd-ev-one-megawatt-charging/
That's a downright unsettling amount of power.
David Roden, EVDL moderator & general lackey
To reach me, don't reply to this message; I won't get it. Use my
offlist address here : http://evdl.org/help/index.html#supt
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