[St00k]

I'm not sure if this was known, but the battery size isn't actually 125 kWh, it's 141. That's normal because automakers keep some in reserve to ensure long battery life. Still... I hadn't heard this before.

https://twitter.com/i/web/status/1598136903605571589

 

[CommodoreAmiga]

That doesn't make sense.

Per the Munro teardown, the Rivian Large pack uses Samsung INR21700-50G cells. There are 7,776 of them.

Minimum capacity: 4850mAh
Nominal voltage: 3.6V
Standard charge current: 1.6A (0.33C)
Charge cut-off current: 121mA (0.025C)
Max. charge current: 4.85A (1C)
Charge end voltage: 4.2V
Max. discharge current: 9.7A (2C)
Discharge cut-off voltage: 2.5V
Max pulse discharge: 14.55A (3C)
AC impedance at 1kHz: 14±5mΩ
Max weight: 69.5g

4.85Ah X 3.6V = 17.46Wh
7,776 cells X 17.46Wh = 135.8kWh pack capacity

 

[SANZCO2]

That doesn't make sense.

Per the Munro teardown, the Rivian Large pack uses Samsung INR21700-50G cells. There are 7,776 of them.

Minimum capacity: 4850mAh
Nominal voltage: 3.6V
Standard charge current: 1.6A (0.33C)
Charge cut-off current: 121mA (0.025C)
Max. charge current: 4.85A (1C)
Charge end voltage: 4.2V
Max. discharge current: 9.7A (2C)
Discharge cut-off voltage: 2.5V
Max pulse discharge: 14.55A (3C)
AC impedance at 1kHz: 14±5mΩ
Max weight: 69.5g

4.85Ah X 3.6V = 17.46Wh
7,776 cells X 17.46Wh = 135.8kWh pack capacity

The image shows 3.92 volts, that would make the difference.

 

[RITVT]

I don't know where 125 came from. It has always been 135, no?

 

[Yossarian]

I don't know where 125 came from. It has always been 135, no?

I thought that the claimed battery capacity is 135kWh, but that it was actually 129kWh in the real world. Is the effective capacity really 125 kWh?

 

[SANZCO2]

I thought that the claimed battery capacity is 135kWh, but that it was actually 129kWh in the real world. Is the effective capacity really 125 kWh?

It has always been said the large pack was 135, I’m sure that is based on published specs for the cells. A lot of the testers have been putting the number of usable kWh in the 125 to 129 range based on their testing. That is where that number comes from.

Based on what RJ said about a software update allowing more range next year, maybe they are going to reduce the reserve. Then again, they could be working on the power curve to make it more efficient. Will be interesting to see what if anything comes of his statement.

 

[=0=maxr1t=0=]

It has always been said the large pack was 135, I’m sure that is based on published specs for the cells. A lot of the testers have been putting the number of usable kWh in the 125 to 129 range based on their testing. That is where that number comes from.

Based on what RJ said about a software update allowing more range next year, maybe they are going to reduce the reserve. Then again, they could be working on the power curve to make it more efficient. Will be interesting to see what if anything comes of his statement.

Or reduce draw, increase efficiency, from other systems on the vehicle. It's rumored they are trying to reduce the two 12v battery to one. That would certainly reduce some draw.