Rapid Charging Speeds

[tsedge]

What's the maximum rapid charging speed you've seen in the real world and what was the charge curve like?

(Don't forget to say which model you have).

 

[MSvirus]

IM6 100 kWh NMC, tested rapid charging on a 400V charger for two minutes, just to test that the system works. <50% SoC, minus degrees outside. 50 kW. A little suprised it was not a bit more (like 80).

 

[NickC]

The most have seen is 144kw on a 400kw charger. Ionity has never got above 90. That is on an IM6 LE

 

[MikeJS]

I assume the 5 and 6 are the same so see - IM6 Rapid Charging

 

[tsedge]

I assume the 5 and 6 are the same so see - IM6 Rapid Charging

I'm specifically interested if the 5 is behaving the same as the 6, so please 5 owners, let us know.

 

[pvrima]

I’ve seen 280kW that held to 65% where I stopped (350kW charger). This is the highest reported rate that I can see on Plugshare for this charger.

 

[T1 Terry]

I assume the 5 and 6 are the same so see - IM6 Rapid Charging

That is a real eye opener. With CATL starting full mass production of their Na+ cells that can fast charge better than anything out there at the moment, with no battery health issues, it will be interesting to see the first of these cells in a passenger car as well as a heavy transport vehicle.

T1 Terry

 

[Coulomb]

better than anything out there at the moment,

Ok, slightly out of context quote. But I wonder if drivers will get tired of the car having less peak power at low states of charge. As the sodium cells seem to go down to less than half voltage at low SoC. More flux weakening will be needed to buck the motor's back EMF down to the low battery voltage.

Perhaps with a beefy motor controller, they can just double the battery current to compensate, if the cells and cabling etc are up for it.

 

[T1 Terry]

Ok, slightly out of context quote. But I wonder if drivers will get tired of the car having less peak power at low states of charge. As the sodium cells seem to go down to less than half voltage at low SoC. More flux weakening will be needed to buck the motor's back EMF down to the low battery voltage.

Perhaps with a beefy motor controller, they can just double the battery current to compensate, if the cells and cabling etc are up for it.

These ultra fast chargers are for the 800+ volt architecture, the video showed they were ABB units with max voltage of 1,000 VDC.
Doctor Googles says the operating range is between 594VDC and 930VDC. 235 cells fully charged comes out to the 930VDC, 235 cells @ 2.5v = 594V. This fits roughly in the 1C operating window for CATL Na+ cells, 2.5VDC low cell cut off and 4VDC to 4.3VDC high cell ....

A 100kWh battery would be 235 x 3.1VDC nom. x 138Ah cell in series, so 1C discharge is a reasonable output to the motor ....

Disclaimer: Every chance I got some or all of the maths wrong in that lot a drivel

T1 Terry

 

[Anon70]

This is the in theory charging curve...

MG IM5 Performance charging curve & performance | EVKX.net

Below is the charging curve for MG IM5 Performance, illustrating the charging speed at various battery levels. Additionally, graphs for range and time provide comprehensive details on charging performance.

evkx.net

 

[tsedge]

Ok, slightly out of context quote. But I wonder if drivers will get tired of the car having less peak power at low states of charge. As the sodium cells seem to go down to less than half voltage at low SoC. More flux weakening will be needed to buck the motor's back EMF down to the low battery voltage.

Perhaps with a beefy motor controller, they can just double the battery current to compensate, if the cells and cabling etc are up for it.

Yes, this is a challenge with Sodium, much beefier cabling and components will be needed to handle the wider current variation, which will presumably be expensive. Thermal losses and component cooling requirements will also be higher.

Or, as you say, the car will just have much less power at low SoC. Or some compromise between the two.

I suppose if they can oversize the battery output for a given motor, that would be another option, running it derated at high SoC.

 

[T1 Terry]

I think that is the more likely option, rate the controller to 1,000vdc, limit the voltage to the motor that is wound to optimise the 800v architecture.
The system drops out at 592vdc, the Na+ will provide good current to that point, 1C @ 2.5vdc or so the specs say, charging @ 1,000vdc 150amps gives 150kw, but I believe the new CATL Na+ can charge at more than 2C and suggestions that 3C for the under 60% SOC part, on a 400kw charger, 15 mins from zero to 60% SOC is quick, barely enough time for the nature stop and getting a takeaway coffee ....

T1 Terry