GMC Hummer EV Battery Is Over 200 kWh, But Range Is Only 350 Miles: Why?

Let's talk about the GMC Hummer EV battery (reportedly over 200 kWh) and range (estimated at 350 miles).

2022 GMC Hummer EV Dune

Mark Kane

By: Mark Kane

Oct 21, 2020 at 3:08pm ET

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The recently unveiled GMC Hummer EV is an all-electric high-end pickup truck, but one thing seems to be a concern - the range of up to 350+ miles (563+ km) in the top version.

The less expensive versions will be able to go only for 300+ miles (483+ km) and 250 miles (402 km):

Edition 1 (Fall 2021): $112,595 (MSRP)
range of 350+ miles (563+ km)
3X (Fall 2022): $99,995 (MSRP)
range of 300+ miles (483+ km)
2X (Spring 2023): $89,995 (MSRP)
range of 300+ miles (483+ km)
2 (2024): $79,995 (MSRP)
range of 250+ miles (402+ km)

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The reason behind the range far from 400-500 miles is pretty simple - a vehicle of such size, with that shape, weight and wheels, is not very efficient.

Assuming 200 kWh (the pack capacity was not announced), 350 miles means 571 Wh/mi (355 Wh/km), even before towing anything.

According to the Engineering Explained video (see below from about 14:25), the GMC Hummer EV will be equipped with over a 200 kWh battery pack (GM's representatives reportedly hinted at it, but later told us that the figure is not confirmed).

2022 GMC Hummer EV rolling chassis

The truck will be equipped with Ultium Cells batteries - 24 modules, 24 cells each (total of 576 pouch cells).

Assuming Engineering Explained's number that a single cell has a capacity of 100 Ah, we can estimate the pack's nominal capacity simply by assuming the nominal voltage of the cells:

at 3.5 V: 201.6 kWh
at 3.6 V: 207.4 kWh
at 3.7 V: 213.1 kWh
at 3.8 V: 218.9 kWh

We guess that something around 215 kWh with 200 kWh usable would be a fair number.

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One of the most interesting things about GM's battery approach is wireless communication between the modules.

2022 GMC Hummer EV - Ultium battery pack

The 800 V battery system is ready to charge at up to 350 kW of power (from DC fast chargers). In about 10 minutes, some 100 miles (160 km) out of the total 350 miles range, could be replenished in the top of the line version.

What do you think?

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100 miles is 28.5% of the total range, while the 10 minutes at 350 kW peak would translate into roughly 58 kWh. The 100% range would then be 204 kWh (probably less, as we doubt the ability to stick to 350 kW for the entire 10 minutes).

Anyway, also this way we end with a conclusion that the pack is around 200 kWh usable.

More about the electric Hummer

GMC Reveals 350-Mile Hummer Electric Pickup Truck: $79,995 To $112,595

GMC Hummer Edition 1 Truck Sells Out In Minutes: How Many Is GM Making?

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