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How does the algorithm of BQ4050 determine EDV0/EDV1/EDV2 points?

Scofield
Intellectual 570 points
Other Parts Discussed in Thread: GPCCEDV

Hi，Expert

I want to confirm how the voltage and Hold Time of Fixed EDV0&Fixed EDV1&Fixed EDV2 are set? Can improve the accuracy of SOC.

  • 0
    TI__Genius 11770 points

    Hello Scofield,

    Do you know about this tool? You can upload files showing different discharges at different temperatures according to the document, upload it, and we can calculate the CEDV settings for you to use. This includes the EDV0/1/2 points. The gauge can also calculate these itself if you enable automatic EDV compensation, but I believe you need to start with a fixed value for the gauge to work with. Section 6.4.1 of the TRM explains this process. If you have more specific questions on this, feel free to ask.

    thanks,

    Alex M.

  • 0 in reply to Alexander Mazany
    Intellectual 570 points

    Hi，Mazany

    I still don't understand the formula

    EDV0,1,2 = n (EMF • FBL – | ILOAD | • R0 • FTZ)

    When I use Fixed EDV, EDV0 can be set according to the shutdown voltage of the whole machine. Are EDV1 & EDV2 calculated using GPC CEDV tool?

    Is it the same with Compensated EDV?

    Because I need to fill in the parameter value in DF，But the report returned by the GPC CEDV tool does not have these parameter values (EDV1&EDV2)

  • 0 in reply to Scofield
    TI__Guru** 105760 points

    Hello Scofield,

    When using the compensated EDV points, the EDV voltages calculated will be based on the EMF CEDV parameter. If you are not using the fixed values they do not need to be populated. If you are using the fixed values you would not need to submit any data to the GPCCEDV tool.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 570 points

    Hi，Keller

    Below is my understanding:

    When I use the compensated EDV algorithm, the EDV0 point needs to be set, and the EDV1/EDV2 depends on the EMF. The EDV1/EDV2 I set in the DF has no practical use.

    When I use the Fixed EDV algorithm, EDV0/EDV1/EDV2 need to be set, how can I calculate this value better?use this formula?

    EDV0,1,2 = n (EMF • FBL – | ILOAD | • R0 • FTZ)

  • 0 in reply to Scofield
    TI__Guru** 105760 points

    Hello Scofield,

    You can use the gauge where only the EDV0 is fixed using the FIXED_EDV0 bit, but all the values for EDV points will be based on the CEDV parameters, none will be fixed.

    You can also check the graphs in the TRM for examples of how the EDV points move according to the load and temperature: Figure 6-3.

    I cannot provide the exact calculations since it is a proprietary algorithm. 

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 570 points

    Hi，Keller

    How to set the voltage of EDV0?Is it based on the shutdown voltage of the product?

    If the shutdown condition of the product is to read SOC=0%, what is the appropriate setting for EDV0?

  • +1 in reply to Scofield
    TI__Guru** 105760 points

    Hello Scofield,

    The EDV0 point should be found from the GPCCEDV calculator, it is essentially the terminate voltage where SOC = 0% like you mentioned.

    Sincerely,

    Wyatt Keller