Simscape Battery SoC estimation

Good day everyone,

I recently creating a relatively large battery pack using Simscape Battery Builder. I set up a simple charging and discharging cycle to test it but the SoC I'm getting from the battery pack is discharging slower than expected. I added an estimator block which is giving me SOC values that seem more reasonable. Is there something I missed in creating the battery causing the difference?

This is also affecting the battery degradation/aging since it's based of th number of cycles. I've attached the model and code I used to create the battery pack. Thank you.

Answer 1

[Leepakshi]

Hi,

The slower SoC discharge is often due to how the battery pack calculates SoC versus the estimator. First, check the terminal voltage vs. open-circuit voltage (OCV)—terminal voltage includes the drop from internal resistance under load. If you need accurate charging behavior, use a CC-CV block for constant voltage charging. Also, review initial conditions: setting both initial SoC and initial voltage with high priority can cause conflicts, define only one.

This mathworks documentation for battery creation can help:

https://www.mathworks.com/help/simscape-battery/create-battery-pack.html

Thanks!