Hi,
I have a question about Ti BQ35100 battery fuel gauge. We use it with a primary Li-Mn-O2 cell in the "State-of-health" mode.
I know it is difficult to determine this with this type of battery due to its flat discharge curve.
What I have observed is that the curve for the "State-of-health" is more like the curve for cell voltage than the predicted residual capacity.
I have done three different discharge tests with three different discharge intervals. One with only 5 seconds of relaxation time, one with 30 seconds and one with 10 minutes of relaxation time.
The conclusion is that all "State-of-health measurements" follow the value of the cell voltage rather than the capacity curve with the difference at what level the "plateau" is.
The first measurement with 5 seconds of relaxation time have a "plateau" level of 39%. The second measurement have a "plateau" level of 46% and the last with 65%.
The blue curve shows the cell voltage and the red curve symbolizes the theoretical optimal capacity left.
My question is, should the "State-of-health" value be somewhat linear to the remaining capacity of the battery?
I.e. Should the "State-of-health" value follow the red curve?
