Engineering:General Motors BT1 platform

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GM BT1 platform
GMC Hummer EV, the first vehicle based on the BT1 platform
Overview
ManufacturerGeneral Motors
Production2021–present
Body and chassis
LayoutDual- & triple-motor, all-wheel-drive
RelatedGM BEV3

The GM BT1 platform, marketed under Ultium branding, is a dedicated electric vehicle architecture or platform developed by General Motors (GM). It underpins electric full-size pickup trucks and SUVs sold by GM, using battery and motor technology developed under its Ultium program; these are shared with third-generation GM electric vehicles on the BEV3 platform. BT1 is categorized as a skateboard platform.

History

In October 2019, GM made an agreement with the United Auto Workers (UAW) union to invest US$3 billion in Detroit/Hamtramck Assembly over the next four years, renaming it to "Factory Zero" and converting it to a factory for electric trucks and vans.[1] The UAW's copy of the agreement revealed the "centerpiece" of the investment was a program internally called "Project O" or BT1, which would develop and begin selling a low-volume pickup truck by 2021, aimed at the high end of the market.[2]

The same platform developed for that project, which resulted in the GMC Hummer EV,[3] also would be used for electric versions of full-size General Motors pickup trucks (Chevrolet Silverado / GMC Sierra) and SUVs (Chevrolet Tahoe / Suburban, GMC Yukon, and Cadillac Escalade).[4]

Design

The BT1 platform is designed for full-size trucks and SUVs which currently use a body-on-frame architecture, while unibody passenger cars and crossover utility vehicles will be based on BEV3; both platforms use Ultium batteries and motors.[5] However, Nichole Kraatz, the GM chief engineer for battery electric trucks, characterized BT1 as "not a unibody and ... not a body-on-frame", as the body has an integral floor, like a unibody, but rests on the battery structure, which also acts as a structural member.[6] This confirmed early speculation published in 2019.[7]

Despite its name suggesting a relation to the T1 platform,[4] BT1 shares no parts with the older internal combustion engine full-size pickup truck and SUV platform.[8]

As implemented for the GMC Hummer EV, BT1 has a stamped and welded steel battery case with 24 modules, totaling 246 kW-hr gross, of which 212 kW-hr are usable; the total weight of the battery alone is 2,800 lb (1,300 kg).[9]

Applications

Current models

  • GMC Hummer EV (SUT)
    GMC Hummer EV (SUT)
  • GMC Hummer EV (SUV)
    GMC Hummer EV (SUV)
  • Chevrolet Silverado EV
    Chevrolet Silverado EV
  • Cadillac Escalade IQ
    Cadillac Escalade IQ

Future models

  • Chevrolet Tahoe EV / GMC Yukon EV (2026)[11]
  • Chevrolet Suburban EV / GMC Yukon XL EV (2026)[11]

See also

References

  1. ↑ Hall, Kalea; Noble, Breana (October 17, 2019). "GM to invest $3 billion at Detroit-Hamtramck for electric truck". The Detroit News. https://www.detroitnews.com/story/business/2019/10/17/gm-invest-3-billion-detroit-hamtramck/4017189002/. 
  2. ↑ Klayman, Ben; Lienert, Paul (October 18, 2019). "Exclusive: Electric Hummer could be part of GM's move into EV trucks, SUVs - sources". Reuters. https://www.reuters.com/article/us-usa-autos-labor-evs-exclusive-idUSKBN1WX2HZ. 
  3. ↑ Neil, Dan (March 30, 2023). "2022 GMC Hummer EV Edition 1 Pickup: A Truck With Moves Like a Porsche". The Wall Street Journal. https://www.wsj.com/articles/2022-gmc-hummer-ev-edition-1-pickup-review-a-truck-with-moves-like-a-porsche-62796087. 
  4. ↑ 4.0 4.1 Katakis, Manoli (October 22, 2019). "Electric Hummer, Cadillac, Chevrolet, GMC trucks and SUVs coming". Muscle Cars and Trucks. https://www.musclecarsandtrucks.com/electric-hummer-cadillac-chevrolet-gmc-trucks-and-suvs-coming/. 
  5. ↑ "GM BEV3 Vehicle Platform". 2020-08-02. https://gmauthority.com/blog/gm/gm-platforms/bev3/. 
  6. ↑ Jonathan Lopez (April 17, 2022). "GM's New BT1 Electric Vehicle Platform Is Not Unibody Or Body-On-Frame". GM Authority. https://gmauthority.com/blog/2022/04/gms-new-bt1-electric-vehicle-platform-is-not-unibody-or-body-on-frame/. 
  7. ↑ Cole, Craig (October 21, 2019). "An electric Hummer comeback? We discuss with an expert". Road/Show (CNet). https://www.cnet.com/roadshow/news/hummer-electric-truck-suv/. "'[BT1] is significantly different from T1 ... They are designing it [BT1] from the ground up as an electric platform,' [Sam Fiorani] added, meaning it likely won't have a separate frame with steel rails, but neither will it be unibody, a construction method most frequently used with cars, where the structure is one integrated assembly. Instead, it could be 'a little of each.'" 
  8. ↑ Bell, Lucas (December 2, 2020). "Hummer EV shares zero parts with other GM vehicles". Muscle Cars and Trucks. https://www.musclecarsandtrucks.com/hummer-ev-bt1-platform-zero-parts-sharing-general-motors-truck-suv/. 
  9. ↑ Bell, Lucas (July 7, 2023). "GMC's Hummer EV Has a Very Complicated Battery Pack". Road & Track. https://www.roadandtrack.com/news/a44475384/gmcs-hummer-ev-has-a-very-complicated-battery-pack/. 
  10. ↑ Banner, Justin (May 22, 2023). "2024 Cadillac Escalade IQ: Everything We Know About The Electric 'Slade". Motor Trend. https://www.motortrend.com/news/2024-cadillac-escalade-iq-everything-know-electric-luxury-full-size-suv/. 
  11. ↑ 11.0 11.1 Lutz, Hannah (July 25, 2022). "Chevy, GMC to sell ICE models with EVs". Automotive News. https://www.autonews.com/future-product/chevy-gmc-sell-gasoline-powered-models-ev. 

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