Battery cell parameter estimation using pulse charging data

Hello,

I want to use a pulse charing data of a lithium ion equivalent circuit model parameter estimation. When I looked through matlab, there is an example titled "Generate parameter data for equivalent circuit batter block", this consist in thee steps :

1-Estimate battery discharge script Example_DischargePulseEstimation.

2-Model BatteryEstim3RC_PTBS.

3-Model BatteryEstim3RC_PTBS_EQ.

The only issue is that this model corresponfs to a pulse discharging data.

My question is:

1-Is there any exisiting model that corresponds to pulse discharing data ?

2-Can I "flupud" my charging data and fit in this model rather

Any help will be really appreciated, thanks.

Answer 1

[Sabin]

The example you are pointing to is discharging the battery from fully charged to fully discharged. By changing the sign of the pulse current the battery will be charging.

Check out the following example on MATLAB Central:

https://www.mathworks.com/matlabcentral/fileexchange/36019-battery-modeling

This example includes parameter estimation of single cell using pulsed discharge experiments.

Alternatively, you can check the Battery Parameter Extraction from Data example in Simscape Electrical where both charging and discharging pulses are used to extract battery parameters. I hope this helps.

[KODJOVI SENAM BORIS AHIANDIPE]

Hello, thanks let me have a look

[KODJOVI SENAM BORIS AHIANDIPE]

Hello, I've tried feeding my data into the estimation model BatteryParameterEstimation(input current), output(voltage) coming from my Isothermal Pulse Discharge test, similarly I've created an ideal input current signal, from the signal editor that I connected to the model for simulation. I'm having these issues:

1-Although I have a simulation time set to 240000 wich is close to my real life data point time lenght, the simulation is not going that far

2-Same situation is happening in the parameter estimation app, when I plot simulation and experiment data to see how the fitting will evolve, the simulated voltage does not go up to the same time points as the experiment data.

Any idea about how I can fix this ?

Answer 2

[Joel Van Sickel]

I believe this process: https://www.mathworks.com/help/autoblks/ug/generate-parameter-data-for-estimations-circuit-battery-block.html#bvmmcj1

also supports pulse charge data. It doesn't support combining charge and discharge cycles, but I believe it should work for purely charge cycles. Flipuing the data wouldn't fix it.

https://www.mathworks.com/help/autoblks/ref/battery.pulsesequence.html

https://www.mathworks.com/help/autoblks/ref/battery.pulse.html

They let you specify if the event is a charge or discharge event.

Regards,

Joel