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BQ27542EVM: Inquiry Regarding SOH Drop on BQ27542 Gauge IC

Tom Tsao
Expert 1840 points
Part Number: BQ27542EVM

Tool/software:

Dear TI Support Team,

We are currently using the BQ27542 gauge IC in a customer project and have encountered an issue where the SOH unexpectedly drops to 59% under specific test conditions. Below are the details of the test:

  1. Charging Condition: 0.25A charge for 20 seconds.
  2. Load Condition: Pulse load for approximately 2 seconds.
  3. Observation: The SOH anomaly occurs consistently at the 57th cycle during testing.

Could you please help identify the potential root causes for this behavior? Specifically:

  1. Are there any known factors related to the BQ27542 algorithm that could cause such an SOH drop under these conditions?
  2. Could the pulse load or specific charging/discharging profile affect the SOH calculation or battery modeling?

Thanks!

  • 0
    TI__Mastermind 24741 points

    Hello,

    Can you please provide me with the gg file for this? I imagine that the gauge is not getting proper Qmax updates. Please ensure that Qmax is being updated per the qualifications mentioned in the Theory and Implementation of Impedance Track document from this FAQ. 

    Regards, 

    Jonny.