GM designed the "skateboard" many years before TM copied it. It took years to develop the right sized cell to fit in that design.Early designs frequently aren't optimal moving forward. But pretty soon the engineers realize the benefits of one particular design and everyone coalesces around it. Hence the Bolt following in the footprints of Tesla.
Well, GM's skateboard was a hydrogen fuel cell design, not BEV, and they never commercialized it. I'm not sure it's fair to say Tesla just copied it. And the type of cells Telsa uses (18650) have been around in laptops since the 90's... it wasn't a size issue. Tesla waited until the energy and power density (and cost) of those cells made it possible for a decent electric car.GM designed the "skateboard" many years before TM copied it. It took years to develop the right sized cell to fit in that design.
I park next to a Model S at least once a month. Somehow, their roofline is actually a tad lower than the Volt, even with their pack in the floor. They did a great job on packaging! And that battery road damage event was a pretty freak accident (hitting a large chunk of a broken/detached tow-hitch just right), and I think only cars with the air suspension were really susceptible (car lowered it at high speed for aero reasons)... heck, I've heard of people running over tree branches and rupturing their gas tanks, can't protect against everything! I do agree the T-design is probably safer, but I think a floor pack can be made pretty close to it and allows more cabin space... there's a reason most EVs have chosen that route. What I'd love to see in Volt gen3 is 1/3 of a Bolt pack in floor. Since it's only 1/3, you could position it in the center of the car so it would be just as protected as the T, yet allow more cabin space.AZ EV Driver said:The T-pack also allow the designers to drop the passenger space down keep the height of the vehicle lower for improved frontal profile and a better aerodynamic design. The flat-pack probably moves at least the front passengers higher requiring a taller roof.
If I recall correctly, having the battery low to the road surface has created some damage issues for Tesla which pushed them into adding some shielding to prevent compromises to the battery pack (I won't type the F word).
Perhaps that's the case for Gen 2, but was it the case for Gen 1?The issue as I see it is the Volt uses a standard vehicle chassis that was modified to accommodate a battery. GM felt that a T shape was the best way to accomplish this without compromising the crash performance of the standard vehicle chassis.
My only argument to this is the Spark EV was built on the Spark ICE chassis, has a flat floor and more EV range than the Volt...Spark EV was offered before the Gen2, many had hoped the T-Shaped battery was replaced by the flat floor forever...With all that being said, if GM released the Gen2 with the only difference with today being no rear floor hump, I don't think it would drastically change sales figures...The issue as I see it is the Volt uses a standard vehicle chassis that was modified to accommodate a battery. GM felt that a T shape was the best way to accomplish this without compromising the crash performance of the standard vehicle chassis.
The Bolt EV on the other hand is designed from the ground up to be an EV. The battery is designed to be part of the vehicle structure.
With the 4-6 year life span of many vehicle designs nowadays, wouldn't now be about the time to start design on Gen 3? (Hint, hint, GM!)Yeah redesign a car that was just redesigned. That's the ticket.
GM demonstrated a skateboard design well before Tesla was a thought.Hence the Bolt following in the footprints of Tesla.
Pretty sure the Bolt is using similar cells as Volt and they fit the pack in the floor. Leaf too (though lack of a real thermal system made that easier), and Fit EV, etc. Almost every other BEV than Tesla uses the large flat pouch cells and yet manages to fit them in the floor...The cell dimensions used by the Volt would require a rather thick floor if used in a skateboard configuration. This is OK in a CUV like the Bolt but would not in the Volt. Teslas are able to use the skateboard configuration because they use much smaller cells derived from laptop battery packs.
The Cadillac CT6 Plugin has a conventional floor even though it uses the same battery as the Volt. This was accomplished by stacking the battery vertically behind the rear seat. The downside of this is it reduces trunk volume.