SensorPal Battery impedance measurement

Hi,

  One reason could be that in Sensorpal plot, the measurement points are joined to show line plot.

   You may export the excel sheet containing measured data and check (This is done by clicking the excel sheet symbol next to measure button).

   For example:

ACVoltPP = 300.0f;                                                                                              /* Pk-pk amplitude is 300mV */

  DCVolt = 1200.0f;         

Start freq = 1Hz,

End Freq = 50KHz

Points = 50

Same plot in excel:

  Allowed range of values for Sensorpal parameters are mentioned here:  https://ez.analog.com/reference-designs/f/q-a/563846/software-operation-of-battery-impedance-spectrum-measurement/489023 

Hi,

  One reason could be that in Sensorpal plot, the measurement points are joined to show line plot.

   You may export the excel sheet containing measured data and check (This is done by clicking the excel sheet symbol next to measure button).

   For example:

ACVoltPP = 300.0f;                                                                                              /* Pk-pk amplitude is 300mV */

  DCVolt = 1200.0f;         

Start freq = 1Hz,

End Freq = 50KHz

Points = 50

Same plot in excel:

  Allowed range of values for Sensorpal parameters are mentioned here:  https://ez.analog.com/reference-designs/f/q-a/563846/software-operation-of-battery-impedance-spectrum-measurement/489023 

Hi Akila,

thank you for your reply, the problem really was with SensorPal plot and it looks much more accurate in Excel. 

Also, I know that this circuit is compatible with lithium-ion batteries, but could I do impedance measurement of Nickel-Metal Hydride battery or no? If not, why? 

Hi,

CN0510 measure impedance of any battery that is within below limits:

Max allowed current through battery is 3A.

Minimum current measurable by AD5940 (Analog front end used in CN0510) is 50pA.

May I ask whether the minimum current of 2.66A here should be mA, 2.66A is a very large current. The user guide says 50mA through the battery.

Values updated above. Please check.

Hi,

             I wish to direct you to this document :Using Electrochemical-Impedance Spectroscopy to Image Failures in Hydrogen Fuel Cells | Analog Devices

             Which explains in detail, galvanostatic and potentiostatic measurements of cells other than Li-ion batteries (eg: Hydrogen fuel cells) using AD5941W.