Here are some observations after sorting through Na-ion cell datasheets for an hour:-Every cell I looked at in this form factor is nominally 10 Ah.-Most cells have a recommended maximum 3C discharge rate (i.e. 30 amps assist max recommended).-I found QTY2 cells that have an absolute maximum peak 15C discharge rate (i.e. 150 amps assist max). Note that you typically don't want to design a product that hits "absolute maximum" ratings... specs like this are basically saying "this will break immediately if you ever do it".-Most cells I looked at have a recommended 2C charge rate (i.e. 20 amps regen max recommended).-I found QTY1 cell that has a recommended 3C charge rate (i.e. 30 amps regen max recommended).Given that the Prius routinely exceeds 30 amps assist and 30 amps regen, I have strong concerns regarding a V3 design that uses a 1P series string of cylindrical cells. Please correct me if I'm wrong, but my understanding is that the Prius can easily assist at 150 amps and regen at 75 amps. So then specifically I have the following concerns:1) 150 A_assistPrius > 30 A_assistCell, and;2) 75 A_regenPrius > 30 A_regenCell.I don't know for certain that the V3 NexPower design is 1P, but based on the graphics shown in their video announcement today, it seems likely. For example, a 2P pack would have ~QTY132 total cells, which is about twice as many as are shown. Therefore, I suspect the V3 pack is 1P, which certainly causes concerns for long term cell reliability.Rest assured, I will test these cells on the bench at the maximum assist and regen current they should expect to see in normal use. It's an abusive test, but every cell I've tested has survived it for months, except for the V1 NexCell cell I tested earlier this year @jacktheripper : If you'll let me know the cell model and overall pack configuration, I can make more definitive statements.
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