Part Number:BQ34Z100-G1
Good morning,
I'm using the BQ34Z100-G1 in a MiMH battery pack (24S1P configuration).
I've tried to repeat twice the learning cycle procedure for creating the golden file, but I have a problem after the charging and relaxation phase: the Udate Status doesn't switch to 05.
To be honest, it is not so clear from any documentation how to apply the learning cycle to a NiMH battery pack. For example, the NiMH batteries does not require the CC-CV charging method, so I didn't apply it. The BQ34Z100-G1 in fact has other criteria for detecting the charge termination (e.g. dT/dt and negative dV/dt) that can be applied to a normal CC charging method. So I performed the learning cycle by following a CC charging phase (at C/5). During my learning cycle the BQ34Z100-G1 detects the full charge, OCVTAKEN properly switch to 1 during relaxation and Vok to 0. But the Update Status doesn't switch to 05 and QMAX Cell 0 parameter is fixed to the original set value.
I have the suspect the learning cycle must always been performed with a CC-CV charging method, but I haven't find any explanation about that in any documentation. In fact in my CC charging phase I've noted the BQ34Z100-G1 detect the full charge when SOC=100% (I think when the passed charge equals the Qmax value), but after that my charghing phase still go ahead for many time, because the dT/dt termination condition is still far. So at the end the total charge forced into the batery during the charging phase is much more than the nominal value (i.e. the original value set for Qmax Cell 0). Could this be a problem?
Can anybody help me with this issue? I need some suggestions for performing the learning cycle on my NiMH battery pack.
Thank you and best regards
Matteo