Featured GM announces many new EV's

Hopefully they're next electric iteration won't be a compact, but rather more substantial.
.

 

Not counting the stupid hummer

Gm holds dog and pony show for investors, stock up 87 cents

 

You may break even yet!
.

 

I'll see that 10 and raise it two.
Charged EVs | GM shows 12 future EVs, new Ultium battery system

 

It is all hype until it is on the road and proven over thousands of cars and thousands of miles.

Still a move in the right direction.

 

Better hope for a long warranty on the battery cause this seems like a plan for early battery failure.

 

A modular battery like it seems to note means you do not need to match cells. That would be awesome rather than playing the cell matching or balancing game....

moto g(7) power ?

 

The VW BEV platform was designed to use different type of cells, and Model #'s in China are using different cells.
GM's system is dropping pack level battery monitoring and management, and going with stack level to allow the mixing of different types within the same pack.

 

I understand this Auto Line After Hours will be a hoot:

Reporter Roundtable
Christie Schweinsberg, Wards Intelligence; Joe White, Reuters; Gary Vasilash, AD&P; John McElroy, Autoline.tv

LIVE March 5@ 3:00PM EST​

Bob Wilson

 

How will they charge in series different cells?

 

The magic spell wears off, gm down 2%

 

That's not really fair considering the whole market was down.

 

i'm just teasing but i do suspect the spell will wear off as things drag on. wall street is nothing, if not impatient

 

Yikes, seems like several companies are making battery decisions that will come back to bite them in 5+ years!

 

You misspelled their customers. They will be the ones taking the hit.

 

Each stack/module has a management circuit telling the charge system its cell's requirements. There isn't different cell types under the module level.

In addition to making the use of different cells easier, GM's system should make repairs easier, as a replaced module doesn't need to be balanced against the rest of the pack, which can take days with a large pack.

 

elon probably can't sleep

 

Just finished my review:

• Nickel Cobalt Managenese Aluminum (NCMA) vs Tesla Nickel Cobalt Aluminum (NCA) - we'll need samples for testing. Tesla 2170 cells are readily available
• wide coating of electrodes - they claim economies of scale, once the battery plant comes online but the larger the cell, the greater the risk of spoiling the whole with one defect
• smallest number of the largest cells - which means one cell failure leads to a bricked car. Those of us with Prius experience know how a single cell failure leads to cascading set of problems and a bricked car in 3-6 months
• 100 Ah cell - @3.7 V, 3,700 Wh per cell, putting all your eggs in one basket
• 20 layers per cell - one bad roller and a lot of scrap
• flat bottom (long edge) connected to cold-plate - this suggests there will be a significant thermal gradient which means a mechanical strain between the cold plate and far edge. In our Model 3, the cells are warmed to ~50 C for charging but cooled to ~30 C for operation. The Tesla thermal gradient is from the rim to the core which significantly reduces the thermal, mechanical strain.
• zeolite - an ion holding material whose role is not explained
• Bolt EV battery comparison - 25% weight reduction, 50% fewer connections, a GOOD THING
• vertical integration - a GOOD THING, GM is not outsourcing the critical technology

What was omitted:

• Corvette EV - a Tesla roadster, Taycan, or Mach-E competitor

So here are a couple of images:

Here are three GM different pack configurations showing GM's approach. Notice the inconsistent "modules" from the three pack configurations. But this is what 'raise my eyebrows':

They have a center 'tunnel' of battery cells, not their 'module', to replicate the legacy drive shafts that screwed up cars since forever. DUMB!

A reporter/editor from Electrek, a Bolt owner, attended and verified from multiple sources that they are sticking with a 50 kW maximum DC charge rate. Owning a 50 kW maximum, BMW i3-REx, it means they are doomed to roll around urban areas. To go cross country, you need a minimum of 100 kW or the charge time makes highway travel impossible.

Bob Wilson