Dear, I am using the BQ76952 chip as BMS for a 4P8S 18650 cell battery and I have a problem with the short circuit protection.
In fact, the battery must pass the CC test for certification and each time we do this test, we destroy the discharge mosfets (4 parallel in charge and 4 parallel in discharge).
As the charge mosfets are always ok after test and not the discharge one, I focus on the investigation on the discharge circuit.
My opinion is that the switching during discharge is destroying the mosfets because they are also making switching with high current draw.
We can see also this ripple on your example (doc "multiple FETs with BQ769x2").
I was using a 100R resistor on gate drive and then 10k with fast discharge circuit and it still having some output switching.
At this moment, the unic way I have find is disabling all OC and SC protections and keep the small fuse blowing to do a no reversible protection.
On the attached picture, you can see the fast switchin during the switch off and then the current is back incressing because any mosfet should be destroyed.
If there is any method for eliminate this switcting, please let me know.
Thank you in advance.
Thierry Q.
