Simscape Battery model extension

I am currently using simscape's Battery (Table-Based) element.

I want to make R0(SOC,T) parameter as R0(SOC,T,C-rate) so that R0 also depends on C-rate.

Could you please let me know if there is a way to extend this with this block?

Answer 1

[Govind KM]

Hi yoi,

From what I understand, you wish to set the Terminal Resistance (R0) parameter of the Simscape Battery (Table-Based) block such that it depends on C-rate along with State-of-charge values (SOC) and Temperature (T). Although this cannot be achieved directly, a workaround is to

• Define the C-rate parameter as a variable in the model callbacks or in the base workspace.
• The R0 parameter can then be set as a mathematical expression involving the (SOC,T) lookup table and the C-rate variable, programatically or in the block parameters.
• For example, assuming a direct multiplicative relationship, the R0 parameter can be set programatically through set_param as

%Change myModel to the name of your model
set_param('myModel/Battery (Table-Based)','R0_mat','R_lookup*cRate'); %Assuming cRate is a constant

More details on setting parameter values as variables or expressions can be found in the following documentation:

https://www.mathworks.com/help/simulink/ug/share-and-reuse-block-parameter-values-by-creating-variables.html

Hope this is helpful!

[yoi]

Hi Govind

Thank you for your answer.

I believe SoC, T and C-Rate are changing values from time to time during the simulation. If these physical parameters could be obtained using sensor circuits, etc., how should they be reflected as dynamic in the element parameters(R0 parameter in Battery (Table-Based))?