- cross-posted to:
- electricvehicles@slrpnk.net
- cross-posted to:
- electricvehicles@slrpnk.net
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The 350kw chargers we’ve had for years are good enough. They just need to be reliable and there need to be more of them.
Seriously agree. In reality the changes are marginal. If my charging stop is 15 minutes instead of 20, that’s nice, but it’s a small enough difference to no longer be a decision factor.
It’s much more important to have more chargers at more locations
Are they going to be faster than the new high speed fuel pumps? It used to take a few minutes to pump $20, now it’s almost instant
Does charging the batteries so quickly shorten their life?
The cars have battery management systems that help mitigate the damage from fast charging which is caused by heat and improper ionized diffusion. This article is describing that the new fast charging network is too fast for the current cars BMS right now.
Yes, but for most people the difference doesn’t matter. BMS systems (see other reply) minimize this, and most people typically are doing a much slower charge at home the vast majority of the time. If you really are driving across the US constantly and thus always fast charging for everything it will shorten your battery life. However you will still likely trade in the car before this affects you, and the new owner will note the reduced range but will accept it as a good trade off for the lower cost car.
Its the heat that kills them so this could be minimized with the cooling systems EVs use for their packs.
It can, if you charge the car to 100% everyday. So not a problem for most people
What cars?! Americans can’t even afford eggs let alone new/used EVs!
So what kind of charge times will this translate to, once implemented? Obviously depends on battery capacity but do we have a ballpark?
It will be interesting if they can get charge times quicker than gas refueling but obviously that’s a big challenge.
So, my car is a Chevy Bolt EV, and it has a 60kWh battery. If it were capable of charging a 1MW, it would take 3.6 minutes to charge from 0 to 100. My car can unfortunately only charge at a max of about 50kW, but I’ve owned it for 9 months and have only charged on my standard 120v charger (~1.4 kW) at home.
Does it necessarily charge at that rate the whole time though? It slows down as it fills up I believe.
Technically it should be possible to get to 80-90% at full charging power, assuming the car/battery and charger are properly designed (read: cooled) - most are not, so the charging quickly slows down to prevent overheating.
After that lithium charging (should) transition from Constant Current to Constant Voltage charging, which slowly tapers down to zero, and it usually takes forever to finish.
It would not charge at the full speed the whole time, but the specifics depend on the individual model of car.
You can estimate the time with a rule of thumb: it’s the battery capacity divided by the charging power.
So if you have a 100kWh battery:
- 1 hour if you charge with 100kW
- 0,5 hours with 200kW
- 0,33 hours with 300kW
- 0,25 hours with 400kW
And so on.
As I said this is an estimation. There are factors playing a role that result in losses or power limitation. So in reality it would take a bit longer.
