measuring lipo battery cells

Discussion in 'General Electronics Chat' started by Blisk, Jul 13, 2016.

  1. Blisk

    Thread Starter New Member

    Jun 6, 2016
    14
    0
    I have lipo battery with 8 cells so total voltage is 33.6V
    Now I need to measure each cell and when first one drops to 3.8V when discharge relay will turn off.
    Problem is now how to measeure each cell because they are serial connected.
    I thought to use Cmos 4097 which has 2 x 8 channels to switch between cells.
    problem is because power voltage of 4097 is 12V and battery from first to last cell is 33.6V.
    That will burn 4097.

    Any idea how to solve this?
     
  2. dannyf

    Well-Known Member

    Sep 13, 2015
    1,819
    362
    Use a difference amplifier to shift the signal so it is referenced to ground.
     
  3. Blisk

    Thread Starter New Member

    Jun 6, 2016
    14
    0
    Don't know what you mean?
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,801
    1,105
    Use potential dividers to bring the voltages down to a manageable level.
     
  5. Blisk

    Thread Starter New Member

    Jun 6, 2016
    14
    0
    How about solving that problem with other chip or something else?
     
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