[brian_]

2) EV traction pack reconfigure. An interesting pack to me is the BMW i3 pack. It uses something like 48v modules that are easy to remove and reconfigure into a 96v pack. It would be harder to up the voltage if I wanted to. In addition, It looks like about $3k for a likely degraded 22kwh on the open market for these.

I'm not sure what the advantage of ~48 V in a single module would be; almost any EV pack has at least 8 modules in series and so some combination of modules comes up with a reasonable voltage for this approach

As far as I can tell, the BMW i3 does use 12S modules, so about 45 V nominal. The Volvo Polestar 2 and VW MEB batteries also use 12S modules, but those would not be readily available in salvage yet.

If you want to hit the planned voltage in a single module, you can use Tesla Model 3 short modules (23S) or long modules (25S); a single module would almost hit the target capacity, and two (unfortunately in parallel) would be well up in the target range. Unfortunately because the modules are those two different configurations in the same pack there's no way to use all of the modules from a pack at less than 48S (~180 V).

And as Tim pointed out, there are always the 6S modules of the traditional Model S/X, which could be series connected in pairs for the target fragment voltage, with two pairs in series for operating voltage. Four of these modules from the 86 kW pack is one-quarter of the pack, so a bit over 20 kWh without dealing with any parallel connections.

 

[brian_]

I'm waiting to hear back from Thunderstruck to validate what I'm doing, I'm thinking 4 or 5 packs...

That would be "modules" (the blocks within the battery pack; there are 14 in an early Model S/X, 16 in a later S/X, four in a Model 3, and five in a Model S Plaid) in normal terminology, rather than "packs" (a pack is a set of cells or modules in a box; a Tesla car has one pack).

 

[brian_]

There's no such thing as a Model S/X.

MesquiteTim appears to have difficulty understanding that "Model S/X" obviously refers to the Model S and Model X, which use the same components (drive units, battery, etc). I assume that no one else has this difficulty.

Discussing the Model 3, Model S Plaid and Model S modules in the same reply as if all Tesla modules are the same is hilarious. You want used modules out of a Model S or out of a Model X.

Of course there are huge differences (mostly in size but also in internal construction) in the various Tesla modules, and no one suggested anything else. Traditional (not Plaid) Model S or X modules may indeed be the most desirable of the Tesla modules in this case, but that's not MesquiteTim's decision.

Technically, they are ALL batteries, not modules.

While any set of cells - including a module - is technically a battery (because a battery is "a group of two or more similar objects functioning together"), MesquiteTim apparently doesn't understand common industry terminology, in which a set of cells forming only part of a complete EV energy storage system is called a module; "battery" is typically reserved for the complete set of modules in a case. It's just easier to get useful information if you understand and use common terms.