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LiPo Battery voltage difference across cells

Discussion in 'Power Electronics' started by alexanderait, Jun 21, 2021.

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  1. alexanderait

    alexanderait

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    Jun 21, 2021
    Total novice with electronics, and having problems with a lithium polymer battery (it is a robotics project built by someone else but I need to get it functioning). When charging the battery, the charger is telling us that there is too great a voltage difference across the cells.

    What could be causing this and is there a way to reverse it?

    The battery is GENS ACE 2S-5000-100C HARDCASE. Any help with this would be amazing
     
  2. Audioguru

    Audioguru

    3,333
    709
    Sep 24, 2016
    That is a very powerful battery when it is new. Your charger is smart enough to detect damage in the battery and refuse to charge it preventing an explosion and/or fire.
    A Li-PO battery might have physical damage or internally have one cell with a voltage too low (less than 3.0V) or too high (over 4.2V).
     
  3. alexanderait

    alexanderait

    2
    0
    Jun 21, 2021
    Thanks for the response.
    So too low a voltage in one of the cells is permanent damage? There is no way to reverse it and make the battery useable again (without risking fire)?
     
  4. Audioguru

    Audioguru

    3,333
    709
    Sep 24, 2016
    A cell with a voltage too low might have physical Lithium metal plated where ions should be there.
    When some chargers detect a low voltage then they attempt charging at a very low current and if the voltage slowly rises without the battery temperature rising then the battery will be fine. The Lithium plating might be very thin and a normal charging current would cause it to overheat or fuse causing an explosion/fire. Lithium is a flammable metal similar to magnesium and plutonium.

    You should be able to measure the voltage of each cell on your battery.
     
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