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Delta SOC

Discussion in 'Gen 2 Prius Technical Discussion' started by alexeft, Sep 7, 2014.

  1. alexeft

    alexeft Member

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    Hi all,

    I have been noticing that my HV battery appears to have a little less capacity (drains a little earlier), but all cells appear very close to one another in terms of voltage and internal resistance. Also, the DeltaSOC is 0% as reported by Techstream through the miniVCI.

    What's your opinion on the state of my battery? What exactly is deltaSOC?

    It's a 2004 Prius at 160k miles.
     
    #1 alexeft, Sep 7, 2014
  2. jdenenberg

    jdenenberg EE Professor

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    Your battery appears to be in good shape.
    DeltaSOC is a measure of the differences in the State Of Charge between module pairs. Note that there are 28 modules in a 2004 Prius HV battery and each one has 6 (1.2 volts each) NiMh "cells" in series. Your Prius monitors them in pairs (14 readings) as all of the modules are connected in series to generate the 200+ volts of the HV battery.

    JeffD
     
    #2 jdenenberg, Sep 7, 2014
    alexeft likes this.
  3. alexeft

    alexeft Member

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    Thanks for the answers professor! Nice to know what you said! :)
     
    #3 alexeft, Sep 7, 2014
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