Plug in for EV Prius

<div class='quotetop'>QUOTE(darelldd @ Jun 11 2006, 07:57 PM) [snapback]269711[/snapback]</div>

Probably we should analize the charger of your Rav4 to determine SOC and limits of the almost the same Hybrid Battery and we'll have a more approximate answer

 

<div class='quotetop'>QUOTE(darelldd @ Jun 11 2006, 07:57 PM) [snapback]269711[/snapback]</div>

If it's true that there is no equalization of the cells, then that is evidence that 100% SOC would lead to a short battery life. By restricting the SOC to a range of 40-80%, they will be a lot more forgiving of mismatch among the batteries. In a true EV it would be crazy to deep-cycle the batteries without performing equalization. There is a very real risk of over-voltage on a cell (imagine one cell has an actual capacity 2 sigma below the mean) or reversing polarity during discharge.

I guess the 40-80 range allows for a wide variation in the cell characteristics without fear of reverse or over voltage conditions. I think this would also require that the battery design went to some care to make sure there is never a very large thermal gradient across the cells.

It actually makes life simpler for me if it doesn't equalize because a 100 Watt charger might not be able to keep up with a load equalizer.

 

<div class='quotetop'>QUOTE(darelldd @ Jun 12 2006, 08:57 AM) [snapback]269711[/snapback]</div>

The "monitoring voltage dips and temperature" method is to detect the absolute 100% SOC level.
We know Prius battery meter shown as full 8 level green bar is 80% SOC.
You wrote you can drive a few miles even the RAV4 EV battery meter shows the 0% SOC, which means the RAV4 battery meter does not show the absolute SOC level.
Do you know the absolute SOC level when the RAV4 EV battery meter shows the 100% SOC?

Ken@Japan