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FAQ: bq78PL114 Auxiliary Chemistry Test

Jim M15252
Intellectual 1940 points
Other Parts Discussed in Thread: BQWIZARD

FAQ1:  Can I use a resistor during the discharge phases of the test?

A1: Yes.  The requirement is that the discharge be constant - constant in Power, Current or Resistance.  An additional requirement is the the battery be fully discharged during each discharge phase.  When not using constant current, determine the average current used during the first discharge and enter it into the spot in the bqWizard Utility for "First Discharge."

FAQ2: Do I have to use 0.7C for charge rate?  What current level should I use if my equipment won't go that high?   

A2:  The rate specified is the nominal charge rate.  The minimum charge current recommended is 200mA.

FAQ3:  Do I have to use C/2 for the discharge rate?

A3:  C/2 is a recommended rate to get accurate low SOC readings.  Going above the C/2 rate for discharge could effect accuracy of results. 

  • 0
    Expert 2135 points

    Does sticking to a <C/2 discharge rate take precedence over using a rate typical of what the cells see during normal use?

    We have two applications where the typical discharge rate is often 5C or higher. We've been using 2.5C as the AUX file test value for the discharge as that's the highest we can go and still have the test data converted successfully to an AUX file.

    Should we drop down back to C/2? We've been having some problems with SOC values at higher discharge rates (over 5C, up to 10C) but I don't know if that's a limitation of the algorithm or a less-than-accurate AUX file.