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BQ34z110 battery testing methods.

P niranjan
Intellectual 360 points
Other Parts Discussed in Thread: BQ34Z110

I am using this IC just to test the health of a battery. 

1. Is it possible to test the battery, with a generic optimization cycle created using the same kind of battery without any chargers or load?

2. If its not possible, whats the best approach, how many cycle is needed? or just a discharging would be sufficient?

Please help me out. whats the best approach for the application.

  • 0
    TI__Guru 73830 points

    The device will estimate the SOH based on the learned Qmax, Ra-table and the SOH Load I. A full discharge and rest should be adequate to update Qmax and the Ra-table for the new cell. I am not sure what you are referring to with the "without any chargers or load" comment.

  • 0 in reply to ThomasCosby
    Intellectual 360 points

    Thanks thomas.

    Its an application we are trying to develop, to test SOC, available capacity and SOH of a battery. I will run a optimization cycle for a battery. Later I will switch with a different battery but with same specifications. 

    will my BQ34z110 be able to calculate the accurate parameters of SOC, SOH and available capacity, without applying any load? Is it possible? 

  • 0 in reply to ThomasCosby
    Intellectual 360 points

    Mr. Thomas,

    Please find the attached .senc file.(The file extension is changed to .jpeg, since .senc cant be uploaded, please change the extension, sorry for the trouble)

    I am trying to optimize BQ, for a 12V 7500mAH battery. The charger and the load is connected and controlled using a microcontroller and it is an automated process. 

    The following is my learning process:

    1. Without enabling the IT algorithm, I charge the battery, till the current flowing in the battery is less then tapper current and I relax the battery.

    2. I clear the update status to 0 so that a new optimization cycle is not affected the previous cycle. Is it a problem? or should i load the value with 4? 

    3.I enable the IT algorithm, and discharge the battery below 500mV cell voltage and temporarily adjust the cell terminate voltage. 

    4. Relax the battery and wait until OCV is taken.

    5. Charge the battery until inflow current is less then tapper current. 

    6. relax the battery and wait until OCV is taken.

    7. Discharge the battery below 500mv cell voltage.Relax the battery and wait until OCV is taken.

    as per the micro controller program, the cycle should continue till update status is 6. But it stays in 4 after a complete cycle.

    Please help me to figure out the problem.