Actually my original algorithm did exactly that. The problem with that approach is the amount of energy required to change the cell voltage by 0.1V goes up exponentially once it's below 3.5V, where the charge curve flattens out. An example would be a 40% state of charge battery could be 3.30V and a 60% state of charge battery would be 3.33V. When the batteries are usually about 1-3% difference in SoC, it become very difficult to balance them based on just looking at the voltage alone. The measuring error is probably more than the actual voltage difference. That why I decided to not bother balancing the battery once they are below 3.5V.
The numbers I'm getting is for LiFePo4. There are many other chemistry of Li-on variant, and LiFePo4 so far is the safest. It does not burn up like the ones in your laptop, but at the cost of slightly less energy density.
The numbers I'm getting is for LiFePo4. There are many other chemistry of Li-on variant, and LiFePo4 so far is the safest. It does not burn up like the ones in your laptop, but at the cost of slightly less energy density.
The type of batteries we had in our EV was these ones made by Winston Battery: http://en.winston-battery.com/index.php/products/power-batte...
They were kind enough to donate almost $20,000 worth of these babies to us. We had 160Ah x 3 in parallel.