I have a load which can also be set to "Battery test". I can easily discharge a Li-ion battery using the CC (contant-current) mode, which is also a condition recommended by the manufacturers. For example, a typical recommendation would be:
Discharge CC (18A) to 2.0V @ 20degC
I have worked with CC before and it works as expected. But what about CV (contant-voltage)? One can never see that on the specs/recommendations. If I set one knob to CV and use the "Battery Test" setting, it says that I can't use it. So I assumed that the load doesn't really like the idea of CV and I was wondering why?
I could switch to another type of load (not "Battery Testing"), where I can actually set the CV, but I'm afraid that this would destroy the battery. Can anyone help me to figure out whether or not I could force CV into the battery and why is there no CV into the battery-testing option? Thank you
Best Answer
If you use constant voltage less than the battery voltage the only thing limiting the current is the battery resistance. That, being small, means the initial current is very high and uncontrolled. This will result in overheating and potential fire/explosion.
The whole point of CC discharge is to limit that heating effect.