The Ni-MH pack states 28 modules, 6 cells in each module, at 1.2v each. 168 cells, and a total of 201.6v. The Li-Ion pack states 56 cells, 3.7v for each cell, and 207v total. What I'm wanting to know is the module count? I've looked everywhere. Not too sure if I can use math to figure it out or what.
Are you trying to use the Li-ion modules in a Gen2/3 or visa-versa? It won't work. 1) different chemistry. 2) the ECUS are programmed for their original chemistry from the factory. 3) there will likely be a physical size difference of the modules.
Since you own/drive the car in question, open the case. Granted it is not readily accessible like Gen2s. Get the service manual for the 2016 from Toyota TIS (Technical Information System). 2 business day subscription is $15.
Looks like individual cells organized in two stacks. This makes sense as lithium ion needs cell level management.
Don't know if anyone else has read this yet but Toyota might have made a drastic change in the way the 28 NimH modules are connected to each other in series in the HV battery pack in the Gen 4. Here's what was cited in an article posted four days ago: A look inside the new Prius hybrid system - Autoblog Electrical losses were also reduced: "Instead of joints put together with screws on bus bars and connection bars, we now weld them together," If this sentence is about the NimH HV battery pack and if the source is accurate, I don't like that at all! It might be difficult (or impossible) to swap modules in Gen 4 packs when the time comes to replace a failed module or two. It is very easy to replace or rearrange modules on the Gen 1, 2, and 3. Just something to be aware of for those considering a used Gen 4 a few years from now after they've accumulated 100K+ miles in Texas and Florida.
