Quote:
Originally Posted by Piotrsko
Wasn't thinking about re using it to RECHARGE, but more along the lines of parallel pack. Recharge is much easier, but could it be done while in use without setting a obd flag?
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It has been about 10 years since I seriously investigated this kind of system but my understanding of how it works is this:
The Li-Ion pack feeds power to the stock Ni-MH battery through a DC-DC converter with the voltage set to about 80% or so of the NI-MH battery's SOC. Because the voltage being fed into the battery is within the normal range the OBD doesn't notice anything. The OBD just thinks the Ni-MH magically is staying in the correct range for EV mode mile after mile. When the Li-Ion battery gets to 20% the DC-DC inverter turns off, stops feeding power through the stock battery, and then the Prius runs like stock but with some extra weight under the hatch. The Li-ion battery is then recharged at home with AC power.
So it works kinda like a PHEV but without the ability to recharge the piggy-back Li-Ion battery from the engine.