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Li-ion cell model

brucelee2

Hi all,

Im currently involved in Li-ion cell balancing methods. I have come to a time where i need a model of a li-ion cell (to have a voltage profile with State of charge). Im aware of a schematic to do this(other suggestions are welcome). I now need to make a model in spice. Can someone briefly describe to me the process for doing so? 

Thanks in advance,

 

BRuce 

 

Parents

  •  A possible hint for the look-up table would be:

     http://www.cadence.com/rl/Resources/application_notes/nonlinear_capacitor_model_appnote.pdf

    How to change the SOC in SPICE is a good question. Maybe you could do it by converting the cells capacity from SOC into Coulomb.
    What I mean: A fully charged cell (with 10Ah capacity for example) has 36000As . For estimation of the "SOC" - and the according cell voltage - you could integrate (coulomb counting) the current going through the cell. => But this is be only an idea. I never did it in SPICE.

    In a former work I modeled a Li-ion cell in MATLAB, together with an idealized model of a transformer for cell balancing. The major focus was on the performance of cell balancing.

     

    I think it mainly depends on what you want to get out. Would it be only the general behaviour/performance of the switched capacitor (then MATLAB), or detailed switching behaviour of the flying capacitor (then SPICE).

     

    Funkensprung

Reply

  •  A possible hint for the look-up table would be:

     http://www.cadence.com/rl/Resources/application_notes/nonlinear_capacitor_model_appnote.pdf

    How to change the SOC in SPICE is a good question. Maybe you could do it by converting the cells capacity from SOC into Coulomb.
    What I mean: A fully charged cell (with 10Ah capacity for example) has 36000As . For estimation of the "SOC" - and the according cell voltage - you could integrate (coulomb counting) the current going through the cell. => But this is be only an idea. I never did it in SPICE.

    In a former work I modeled a Li-ion cell in MATLAB, together with an idealized model of a transformer for cell balancing. The major focus was on the performance of cell balancing.

     

    I think it mainly depends on what you want to get out. Would it be only the general behaviour/performance of the switched capacitor (then MATLAB), or detailed switching behaviour of the flying capacitor (then SPICE).

     

    Funkensprung

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