The effect of the depth of discharge on the battery is: the deeper the depth of discharge, the easier it is to shorten the battery life, on the other hand, the performance on the discharge curve. The deep discharge comes with unstable voltage and current, and under the same discharge system, a small voltage value will deepen the discharge depth.
In practice, the termination voltage value is usually used to control the DOD. When the lithium-iron battery is likely to be over-discharged, the voltage of the lithium-iron battery is lower than the IC over-discharge voltage detection point of 2.2V (some set to 2.5V). At this time, the discharge protection function is activated, and the MOSFET turns from ON to OFF to cut off the discharge, thus completing the control of the depth of discharge of the lithium-iron battery.
A general rule of thumb is that the following DOD should be considered:
