Cold Weather Testing | Progress Report | Rivian - Official Video

[azbill]

The spec sheet said 920V not 800V so maybe 500amp is possible ?

No, higher voltage would be even less current.

Here is the electrical equation:

Watts = Voltage * Amperage

Voltage limit of CCS is 920V, Current Limit is 500A. But KW limit overrides the individual limits. The combination of current and voltage cannot exceed 350KW. At 920V the current could only be 380A. Plus the battery would be at full charge by the time it reached 920V.

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[LoneStar]

I love seeing this cold climate testing because it looks like a blast!
Not sure it matters much here in San Diego!

 

[azbill]

Looks like no heat pump confirmed
“In extremely cold conditions we use some battery energy to keep the cells in our battery above 14°F to provide controlled vehicle performance. Some EVs have electrical heaters to heat the battery up, which is another component — more cost, more mass and a drain on electrical supply. Instead, we’re using our inverter and motor to generate heat — even while stationary our traction system can generate substantial heat for the battery. And we use that heat to warm the battery to the point where it can deliver full performance. Our battery is uniquely designed to operate in super cold conditions, all the way down to an ambient temp of -40°F.”

To be using the inverter and motor to generate heat, that is still using electrical current, simply not a separate resistance, but instead using the motor resistance.

 

[MReda]

Explain if you can

The statement about using the inverter and motor implies the mechanism they use for keeping the batteries warm won't necessarily apply to how they heat the cabin. They are generating heat from a stationary drivetrain to maintain battery temps.

 

[jjwolf120]

Explain if you can

The fact that they are the inverter and the electric motor to heat the battery, doesn't mean they will use the inverter and the electric motor to heat the cabin. They didn't mention anything about how they are heating the cabin.

 

[Canthoney]

The fact that they are the inverter and the electric motor to heat the battery, doesn't mean they will use the inverter and the electric motor to heat the cabin. They didn't mention anything about how they are heating the cabin.

Makes sense, thanks for the explanation

 

[MReda]

All of these pictures are of the R1T, so this seems like a pointless way for the seats to fold down:

We are simultaneously developing traction control, torque vectoring, regen slip control, anti-lock braking and electronic stability control with the goal to get them all to play nicely together — especially in the snow.

Torque vectoring with four motors... Just the thought of it gives me goosebumps.

 

[JeremyMKE]

It looked like we saw the Frunk Lid closing electrically... What do you think? 3:22 mark.

 

[MReda]

It looked like we saw the Frunk Lid closing electrically... What do you think? 3:22 mark.

It does look like he was holding a button down to close it.

 

[SeaGeo]

They me



The spec sheet said 920V not 800V so maybe 500amp is possible ?

The spec sheet was just for the charger, not the car.

 

[cohall]

It looked like we saw the Frunk Lid closing electrically... What do you think? 3:22 mark.

That just looks he has laptop on the normal seat bottom cushion, not a folded seatback.

 

[kanundrum]

The spec sheet was just for the charger, not the car.

Correct. Just assuming they'd design in tandem. Why make a charger the vehicle would be never capable of using.

 

[RforRivian]

Based on this shot I am very worried about glare on the instrument panel screen... Hopefully it won't be a problem.

However, I wonder if the reason it is so close to the driver is because it's a touch screen that you can interact with. I doubt it but it'd be interesting to see how that would be implemented.

 

[SeaGeo]

So, this confirms they currently have a 400V charging system. 160KW at 400A and 200KW at 500A.

If they had 800V charging, then 400A would be 320KW and 500A would not be possible, due to the 350 KW limit. In an 800V system the maximum current supplied by the charger is 437.5A at 350KW rate.

Yeah, that's super disappointing. That would imply theoretical minimum of half an hour for 5 to 80% for the 135kwh battery pack. Realistically more like 40 minutes probably.

 

[SeaGeo]

Correct. Just assuming they'd design in tandem. Why make a charger the vehicle would be never capable of using.

Because they'll make more than one vehicle. Why make a charger that doesn't have those specs when you know you'll eventually have a 800v+ vehicle even if you don't now?

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