It is safely impossible to drop an ideal battery to zero volts. A battery cannot go down to zero volts because of the internal chemistry. In a standard use, you cannot drop the voltage below 2 volts, even if you wired the terminals together. Batteries will vary between 3.8 and 2.4 volts per cell. As voltage drops, internal resistance rises.
I hope to receive the response. Thank you very much. zero volt charging is used when batteries are very low, we apply a diode voltage drop from the PACK side supplied from the charger to the CHG FET gate, this allows a small trickle charge so the batteries are not damaged.
Generally, is zero voltage charging performed on the battery before pre-charging？ Do I understand it correctly? Looking forward to your reply very much. Yes that's correct, the FET will essentially act a resistor since it will be in the ohmic region to allow a very small charge current. Zero volt charging should be smaller than pre-charge, yes.
Recovering a Lithium-Ion battery cell from zero volts is not recommended, as it can result in a fire. This is because once the cell goes under about 2.5 or 2.6 volts, a chemical reaction occurs inside the cell that permanently damages it and drastically increases its internal resistance.
Check the Why Can't I drop it to zero volts header. Almost every Li-ion battery has copper as anode current collector. When copper is exposed to high anode voltage due to high discharge, the copper dissolute in to the electrolyte provoking internal electrical resistance rise.
A 12v Battery Pack was at 0V and wouldn't take a charge. Manufacturer Miady recommended starting up the sleeping BMS with a 9-volt battery across the terminals. I tried this -- it worked! Battery read just over 10V on voltmeter. Immediately connected to charger.