I know lipo batteries from doing allot of RC airplane stuff. my question is how many cells are in the PIP battery ? i know that in RC batteries the cells are fully charged at 4.20 volts per cell and you dont want to discharge them anymore than 3.70v. also if you are going to store the batteries you want to store them at 3.8v per cell. does the Toyota battery management work in the same way ?
wouldn't surprise me. a couple hubert cells give or take i think, number must be here some where. of course, the pip limits charge between 25 and 85% or some such, and for longer storage, you're supposed to run it down to the hv portion which puts it in that lower %.
I found a document from Toyota which states "...346 volt pack consisting of 3.6 volt cells connected in a series-parallel circuit". Also, there are 288 cells total, with 96 connected in series to reach 346 volts.
Excuse the error, but the above info is for the 2010 Prius Plug-In. The 2012 (which is the first production one we had here in the US) is different. It uses a 207.2 volt pack with 56 3.7 volt cells in a series-parallel configuration. According to the Prius PHV Dismantler's Manual from Toyota.
It sounds just like a larger version of the RC airplane battery packs. That's allot of cells to monitor, to keep the voltage balanced across all the cells. I hope they made it so you can just replace one cell if it goes bad. Is there any way to see the actual voltage of each cell through the car computer in a 2013 pip ?
BMS monitors more than the voltage. It also monitors temp and pressure. The main driving force is the state of charge. A full charge starts at 85.1% and the EV mode exits at around 22%.
no, they didn't make it so you can just replace one cell. you can, but it's not easy, and it's not simple, and it's not ideal.
