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How to measure the amount of energy stored in a battery ?

Discussion in 'Hobby Electronics' started by Guest, Jan 20, 2005.

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  1. Mike Harding

    Mike Harding Guest

    Oh Phyllis....

    "Impossible"? Can we quote you on that?
    Or is that a qualified "impossibility"?
    I think you really mean "very difficult", don't you?

    Mike Harding
     
  2. Franc Zabkar

    Franc Zabkar Guest

    The URL linked to by RH shows that it is possible to assess the state
    of at least one cell chemistry (ie lead acid). Cadex use some
    proprietary algorithm to measure and evaluate the frequency dependency
    of a cell's internal impedance.

    As for intermittent usage, I would think that a smart chip could
    become confused under such conditions. For example, how could a
    coulomb counter possibly know how much capacity has been lost to self
    discharge, such as when a cell remains unused for long periods? In
    such a case, ESR may be a better predictor of remaining capacity.
    An old battery with reduced capacity can also confuse a simple coulomb
    counter.

    As for temperature effects, just wait for the battery to cool to room

    - Franc Zabkar
     
  3. Phil Allison

    Phil Allison Guest

    "Franc Zabkar" = really - irritating - fucking - idiot
    "Phil Allison"

    ** Part of the software routine to allow for that - self discharge can be
    estimated.


    ** So might dissecting your recent faeces.


    ** Now the PITA jerk off is posting my words back to me:

    " Sometimes the calculated **model** and the battery get right out of whack
    and the micro has to be reset while the battery is fully cycled -
    likewise if the battery becomes defective or dies of old age the model
    will be wrong. "


    ** Tell that to folk using batteries in the snow or a desert.

    Let the peasants eat cake ........


    BTW

    Ever figure out how increasing the value of a filter electro does not
    increase the rms current draw - Frank ??




    ................... Phil
     
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