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IBEX Measurement Technology

Method 1:

1. Impedance measurments can be performed by passing a current of known frequency and amplitude through the battery and measuring the resultant ac voltage drop across each cell/unit. The ac voltage measurement is taken between the positive and negative terminals of individual cells or the smallest group of cells possible. Compute the resulting impedance using Ohm’s Law.

2. Conductance measurements can be performed by applying a voltage of known frequency and amplitude across a cell/unit and observing the ac current that flows in response to it. The conductance is the ratio of the ac current component that is in-phase with the ac voltage, to the amplitude of the ac voltage producing it.

3. Resistance measurements can be performed by applying a load across the cell/unit and measuring the step change in voltage and current. The ohmic value is calculated by dividing the change in voltage by the change in current.

Method 2:

*Recommended technology of battery aging status measurment by IEEE 1188-1996

1. By applying a AC current to battery, and measuring resultant AC voltage drop. Compute the resultant “impedance” using “Ohm’s law” – Not calculate

2. By applying a AC voltage to battery, and observing the AC current values. Compute the resultant “Conductance (S)” by “Ohm’s law” – Calculate

3. By applying a load across the cell/unit and measuring the step change in voltage and current(Vdt/Tdt), calculate “Resistance”.

*Remarks; Difference between method 1 and 2 is whether they are considered with of AC current in-phase, or not.