Truck & Off-Highway Engineering - October 2023 - 27

ORIGINAL EQUIPMENT
GM's Ultium battery platform can use various form factors and
chemistries to meet changing needs.
The three-motor e4WD propulsion system from the Hummer EV Edition 1
(rear motors shown) also is employed in the military variant.
Leveraging commercial technology
The eMCV is not GM Defense's first go at an electric military
vehicle. The company debuted its All-Electric Military Concept
Vehicle (eISV) variant in 2021, which like the turbodiesel-powered
ISV (Infantry Squad Vehicle), is derived from the
Chevrolet Colorado ZR2 platform.
Based on the nine-passenger ISV, the eISV can carry five
passengers and features GM's commercially-available battery
drive system and components. The vehicle features a cargo
box and a modified integrated Roll Over Protection System
(ROPS) constructed from 4130 chromoly steel tubing.
Engineers developed the eISV from concept to execution in 12
weeks, according to GM Defense.
The eISV features an eCrate 400V, 3-phase AC permanentmagnet
motor. A high-voltage GM BEV2 lithium-ion battery
has a capacity of 66 kWh. The battery technology enhances
capability with low acoustic and thermal signatures and
serves as an onboard mobile-generation power source for
GM Defense's first electric military vehicle, the eISV (electric Infantry
Squad Vehicle), debuted in 2021 and is based on the Chevrolet Colorado
ZR2 platform.
various mission equipment payload packages.
Capable of Level 1 and 2 AC charging, as well as Level 3 DC
fast charging, the eISV features an open architecture and can
be customized to meet customer requirements. Accessories
can be added to enhance the vehicle's capabilities, such as
additional lethality, remote weapon systems, fixed pintle or
swing-arm mounts for medium and heavy machine guns and
grenade launchers.
The ISV is comprised of 90% commercial-off-the-shelf
Ultium battery configuration helped deliver short front and rear
overhangs for both the production Hummer EV (shown) and the eMCV.
TRUCK & OFF-HIGHWAY ENGINEERING
components, including 11 Colorado ZR2 off-road suspension
and chassis upgrades from Chevrolet Performance. GM
Defense says the eISV maintains key attributes of the ISV, including
the utilization of GM's existing global supply chain for
commercial parts. The front axle, for example, is the Colorado
ZR2's Dana M190 with electronic locking differential and the
rear axle a Dana M220 with electronic locking differential.
The EV can cover distances " similar to " ICE-powered solutions,
the company says, and maintains the ability to be rapidly
deployable. Weighing less than 5,000 lb. (2,232 kg), it
can be deployed or inserted through C-17, C-130 and A400M
low-velocity air drop, internally transported in a CH/MH-47
Chinook, CH-53E Super Stallion, CH-53K King Stallion or
sling-loaded under a UH-60 Blackhawk.
Ryan Gehm
October 2023 27
CLOCKWISE FROM TOP LEFT: SAE/MATT WOLFE; GM; GM DEFENSE; SAE/MATT WOLFE
Truck & Off-Highway Engineering - October 2023

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - October 2023
