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HV battery Cell replacement

Discussion in 'Gen 2 Prius Technical Discussion' started by jichi, Feb 22, 2017.

  1. jichi

    jichi Junior Member

    Joined:
    Jan 28, 2015
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    Vehicle:
    2006 Prius
    Model:
    ----USA----
    i had a problem with my prius 2006 hv battery failing block number 3

    1487775012275.png
    and i took the battery apart and measured all the cells and each cell measured 8.24 to 8.27except one measured 6.99 and it was cell number 5
    8.27
    8.26
    8.25
    8.24
    6.99
    8.23
    8.24
    8.24
    8.23
    8.25
    8.26
    8.25
    8.25
    8.25
    8.24
    8.25
    8.26
    8.26
    8.24
    8.26
    8.24
    8.25
    8.25
    8.27
    8.25
    8.27
    8.26
    8.28

    so i went ahead and replaced it with a cell measuring 7.59V.

    i tried to nimh special charger before i did that but for some reason it did not work.

    i put the battery back together put it in the car drove the car with no problem for two weeks. checked it again and now block 9 failed.
    1487775162145.png

    my question is it because the voltages for the cells were high around 8.24V thats why the cell is failing one after the other. or is because I did not balance them although you can see all the blocks have 16.7Volts.

    Posted via the PriusChat mobile app.
     
    #1 jichi, Feb 22, 2017
  2. jdenenberg

    jdenenberg EE Professor

    Joined:
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    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    When you have an HV battery apart, you need to load test every module and replace those that do not maintain their voltage compared to the others. Just looking at the resting voltage is not a sufficient measure of module health.

    Jeffd
     
    #2 jdenenberg, Feb 22, 2017
    MTL_hihy likes this.
  3. MTL_hihy

    MTL_hihy Active Member

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    #3 MTL_hihy, Feb 22, 2017
  4. jichi

    jichi Junior Member

    Joined:
    Jan 28, 2015
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    Vehicle:
    2006 Prius
    Model:
    ----USA----
    #4 jichi, Feb 22, 2017
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