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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

  • Hi,

    I think some thing to do with coulomb counting for SOC and then a look up table for OCV. The model i found in Intusoft ICAPS uses IsSpice4 and has a look up table for the OCV. However im unsure how they get the SOC. I know there are a few RC combinations to get time constants for behaviour but the actual SOC change is a mystery to me. Maybe you can enlighten me :-).

    The model: http://www.intusoft.com/nlhtm/nl78.htm#Modeling_Lithium_Ion_Batteries 

    The model is based on a paper : http://www.reapsystems.co.uk/_publications/Published%20Paper.pdf

    Im mainly involved in investigating this method for balancing; after finding other methods are either inefficient of bulky and expensive. Meaning: carrying our simulations to see the lengths of time to balance and the minimum SOC difference that can be resolved etc; then building a test setup for a specified battery. 

    Im a student :-)

    Kind Regards,

     

    Bruce 

     

     

     

Reply

  • Hi,

    I think some thing to do with coulomb counting for SOC and then a look up table for OCV. The model i found in Intusoft ICAPS uses IsSpice4 and has a look up table for the OCV. However im unsure how they get the SOC. I know there are a few RC combinations to get time constants for behaviour but the actual SOC change is a mystery to me. Maybe you can enlighten me :-).

    The model: http://www.intusoft.com/nlhtm/nl78.htm#Modeling_Lithium_Ion_Batteries 

    The model is based on a paper : http://www.reapsystems.co.uk/_publications/Published%20Paper.pdf

    Im mainly involved in investigating this method for balancing; after finding other methods are either inefficient of bulky and expensive. Meaning: carrying our simulations to see the lengths of time to balance and the minimum SOC difference that can be resolved etc; then building a test setup for a specified battery. 

    Im a student :-)

    Kind Regards,

     

    Bruce 

     

     

     

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