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Weird HV battery readings.

Discussion in 'Generation 1 Prius Discussion' started by Marcelo J Aliberti, Dec 12, 2022.

  1. Marcelo J Aliberti

    Marcelo J Aliberti New Member

    Joined:
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    Location:
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    Vehicle:
    2002 Prius
    Model:
    N/A
    I bought a 2002 Prius 6 months ago and I haven't had any problems since a week ago. I had the red triangle without any code coming from the motor or the battery. The car is still working fine, with no problem at all but the red triangle. I live in south Texas and the latest days have been quite wet. The car has 121000 miles.
    When I put Dr Prius I can see the 19 modules, the voltage difference is quite low (.1 to .16 most of the time), but the weird thing is that the individual voltage is near 8 V and the total voltage is 302 V, while the values for this car should be 7.2 V and 273.6 V respectively.
    Of course, the HV battery is the same that the car has had for the last 6 months without any red triangle.
    So, what could be the problem here? What other check can I do to know where the red triangle comes from?
    Thank you.
    Thank you. Screenshot_20221212-101714.png
     
    #1 Marcelo J Aliberti, Dec 12, 2022
  2. bisco

    bisco cookie crumbler

    Joined:
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
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    Plug-in Base
    you need tech stream for the trouble codes
     
    #2 bisco, Dec 12, 2022
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    Touring
    You see 19 blocks, not modules. Blocks 1-19. Each block is 2 modules in series. 38 modules total.

    7.2 volts is the NOMINAL voltage for one module, which is really just the typical plateau voltage for a 6 cell NiMH battery. Kind of like how 12v is nominal for a 12v lead acid battery, but actual fully charged voltage is more like 12.6+ volts.

    When a 6 cell NiMH is fully charged, it's 8+ volts.

    302v/38 modules = 7.95 volts per module average.
     
    #3 TMR-JWAP, Dec 12, 2022
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