hummer battery teardown

supchrgamx said:

GMC Hummer EV Battery Teardown Proves Our Fears (msn.com)

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I have read several posts suggesting that the Hummer pack, though containing massive kWh, is a bloated, overweight pack and not up to the same standards as other current-generation battery packs. But the numbers tell a different story. When you crunch them, they look like this:

Hummer EV Ultium battery pack:

Weight: 2,923 lb (1326 kg)
usable capacity: 212.7 kWh (usable per EPA doc.)
usable energy density = 212.7 kWh/1,326 kg = 160.5 wH/kg

Comparable current-generation battery pack usable energy densities:

Mach-e std : usable 68 kWh/485 kg = 140 wH/kg (data from Munro)
Model Y: usable 75 kWh/437 kg = 171.5 wH/kg (data from Munro)
Model S Plaid: = 172.5 wH/kg (181.5 wH/kg total energy density per recent Munro video. usable estimated assuming 5% buffer)


Hummer pack vs Mach-e: Hummer pack is 13% lighter than the Mach-e on a gravimetric energy density basis.
Hummer pack vs Y: Hummer pack is only 7% heavier than the Model Y’s on a gravimetric energy density basis
Hummer pack vs Plaid: Hummer pack is only 7% heavier than the Model S Plaid’s on a gravimetric energy density basis.

Regarding that 7% heavier... consider...

The 10” deep high-strength steel Hummer pack structural case provides unprecedented longitudinal, lateral, and torsional stiffness to complete a uniquely- engineered EV-specific integrated body-frame, capable of managing the extreme shock and bending loads found only in aggressive off-road driving challenges. Challenges that no passenger-vehicle-based EV could ever survive.

The light-passenger-vehicle single-layer Lyriq Ultium pack will likely pencil out at about 175 wH/kg. It will compete well with the most energy-dense packs out there. But to navigate the Rubicon, you need a pack that works under extreme conditions, both electrically and structurally. You need a Hummer.

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EJD1984 said:

It appears they totally glossed over the little tidbit that the battery pack is is also the main structural component of the frame for the vehicle.

I see the design as similar to a body-on-frame design, like the Lighting, that happens to fit the battery modules within the frame.

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