Deciphering Hybrid Battery volts

Discussion in 'Gen 3 Prius Technical Discussion' started by bkman, Jul 3, 2018.

  1. bkman

    bkman Junior Member

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    Model:
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    Hi!

    I'm collecting the raw data from OBD-II manually and can't figure out how to decode responses.

    Here's the sample:

    Requests were:
    AT I
    AT H1
    AT L1
    AT SP 6
    AT CAF1
    AT SH 7E2
    2181


    Here's the response (to the last command):
    2181
    7EA 10 23 61 81 31 A1 31 91
    7EA 21 31 78 31 78 31 68 31
    7EA 22 78 31 68 31 78 31 4F
    7EA 23 31 68 31 68 31 91 31
    7EA 24 68 31 A1 AD 06 08 70
    7EA 25 0F 00 00 00 00 00 00


    The formula for getting Battery Block Voltage - V01 is the following:
    (A * 256 + B) * 79.99 / 65535

    Here's the parsed array of responses (in decimal):
    [16, 35, 97, 129, 49, 161, 49, 145, 33, 49, 120, 49, 120, 49, 104, 49, 34, 120, 49, 104, 49, 120, 49, 79, 35, 49, 104, 49, 104, 49, 145, 49, 36, 104, 49, 161, 173, 6, 8, 112, 37, 15, 0, 0, 0, 0, 0, 0]

    So, according to the formula, the V01's value is the following: (16 * 256 + 35 ) * 79.99 / 65536 = 5.042094269 V

    My first question will be: am I getting the voltages using a wrong way or am I parsing it incorrectly?

    Thanks in advance,
    Andrey.
     
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    You need to find a different app. :D

    Or, are you trying to develop one?
     
  3. bkman

    bkman Junior Member

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    That’s correct, I’m trying to come up with an app for tracking battery voltages over time.
     
    dubit and PriusCamper like this.
  4. bisco

    bisco cookie crumbler

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    nice, all the best!(y)
     
  5. PriusCamper

    PriusCamper Senior Member

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    Was doing some research on this yesterday...

    I saw a 2013 article on here somewhere that was talking about an OBDII device that was logging battery date to an SD card. I didn't spent much time with that article because so much has changed in 5 years when it comes to device hardware, but let me know how I can help?

    I'm currently trying to figure out which bad cells are in a hybrid battery in a Gen 2 prius with the "Replace Hybrid Battery" error code and already eliminated the cooling fan issue, replaced 12 volt battery and cleaned corrosion and replaced all the bus pars with higher quality ones from here: NEW Hybrid Battery Bus Bars (26 pcs) Toyota Prius Gen 2/3 2004-2015 - Reflex Concepts LLC and replaced with new nuts from here:
    NSPIN5X12YLW - Spin Nut Yellow Zinc [NSPIN5X12YLW] - $0.35 : Bel-Metric, Metric Hardware, Metric Fasteners, Metric Bolts, Metric Nuts & Time-Sert Thread Repair

    I thought it was just corrosion because the corrosion was really bad and all 28 cells had exact same voltage. Turns out you can't find the bad battery cell on voltage testing alone and need charge/discharge data to identify the bad one(s)

    Let me know how I can help? Oh and make sure to use Google search tools button on google site to focus your search... This website search function, like most website search systems, doesn't work very well at all.
     
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