Minor physical damage to the outer casing like @JamesChase suggests would almost certainly do absolutely nothing to the internal circuitry and function of the battery.
If external physical damage actually did something to your battery, I can almost guarantee you would not need to look for it.
Instead, what is significantly more likely is that you just got a defective cell from the factory. This is what @jpearman is trying to help you diagnose.
@jpearman has been one of the brains behind VEX software and firmware for many years, and he knows what he is talking about.
I suggest you do as @jpearman suggests: run the battery medic on the robot without the charger plugged in, and see what the cell voltages are in the seconds before the robot turns off.
Also, the fourth cell being at 3.22 V while the others are at 3.30 V is not really significant. You cannot draw any conclusions based on that alone.