SOC to OCV Dependency

Eric Lanoue

Other Parts Discussed in Thread: BQ20Z65-R1

Is it accurate to say that TI assumes that the Open Circuit Voltage (OCV) characteristics of a cell does not change with cycle age nor with temperature? In other words, the SOC to OCV dependency is constant. Thanks, E

over 13 years ago

0 Jackie Hui over 13 years ago

TI__Expert 3865 points

OCV will change with temperature. We have temperature information build-in as part of the chemistry data. As battery ages, the resistance will change, the z-track devices keep track of that.

0 Eric Lanoue over 13 years ago in reply to Jackie Hui

Prodigy 50 points

Is it accurate to say the following: During an extended rest periods, the BQ20z65-R1 will determine the cell/pack SOC solely on the SOC vs OCV(T) curves?

0 Jackie Hui over 13 years ago in reply to Eric Lanoue

TI__Expert 3865 points

That is not correct. There are other factors involved in calculating SOC. For instance, in relaxation doesn't mean the current is 0mA, and so impedance will be taken into consideration.

Power management

Power management forum

SOC to OCV Dependency