Battery Fast Charging Optimization (Project 256)

[robertogl]

Contribute to the discussion by asking and/or answering questions, commenting, or sharing your ideas for solutions to project 256

[Shantanu2852]

Hello sir
I am interested in doing this project but I don't understand where to start.Can you please guide me?

[robertogl]

Hi @Shantanu2852,

As suggested in the project description, get familiar with battery modeling, in particular the Single Particle Model (SPM), and battery fast charging. If you are not familiar with this topic, it might be useful to leverage related videos and webinars and Simscape Battery onramp.

[Shantanu2852]

Thank you for your guidance, sir.

I will start by studying the Single Particle Model (SPM) and understanding the fundamentals of battery fast charging. I will also go through the recommended videos, webinars, and the Simscape Battery Onramp. If I have further doubts during the process, I hope it's okay to reach out again.

Thanks once again for your support.

[obayreaps]

[Shantanu2852]

Hello, Could you please share more about your background and how you think you could contribute to this project? It would be helpful to know your skills or any specific areas you're interested in working on.

[rds510]

Hello, my group is having a problem modeling the charging and discharging portion of the battery (Single Particle), we are running into an issue where the State of Charge (SOC) in regards to the Constant Current - Constant Voltage (CC-CV) Algorithm is not working properly and we can not get the battery to meet the threshold to discharge. To add on, we found that when the SOC is at 0 (0% capacity), the voltage is at 3V. When the SOC is at 1 (100% capacity) the voltage is just under 3.5V. Our Voltage readings through out are really wacky and not the ideal voltages. Eventually we want to add temperature but we want to make sure our CC-CV works.

Please anything helps, at least some direction, our group has been stuck on this for a while. If you need any more information feel free to let me know. Thank you.

Battery Builder: We Integrated the Single Particle Battery into our battery, we are using a pouch battery.

Here are our reference values:
Battery capacity of 3,349 mAh or 3.349 Ah
Energy rating of 12.98 Wh.
The battery voltage 3.869V (nominal) (our voltage lies a bit below this)
Maximum of about 4.48V during charging (our voltage never gets to this point but I believe it is possible if configured correctly)

Here is our Model:

Here is a snapshot of our graphs:

Here is a list of the blocks and their parameters from the images:
ModuleType1 (iphone15_s)
Main
Extrapolation method for all tables: Nearest
Initial Targets
Cell state of charge Priority: High Value: 0.3 , 1
Convective Heat Transfer Parameters
Convection type: Constant Area: 0.0054 m^2
Heat transfer coefficient: 10 W/(m^2K)
SOC Estimator (Coulomb Counting)
Parameters Specify Current input as cell current(s): Checked Cell capacity, AH (AHr): 3.349
Sample time (-1 for inherited): -1
Algorithm data type: Inherit: auto
Battery CC-CV4 Parameters
Specify CellVoltage input as [Min,Max]: Unchecked
Cell voltage threshold (V): 4.2
Controller proportional gain: 100
Controller integral gain: 10
Controller anti-windup gain: 1
Gain of signal-tracking feedback loop: 1
Sample time (-1 for inherited): -1
Temperature Source Parameters
Temperature: 298.15 K
Unit Delay Main Initial condition: 1
Input processing: Elements as channels (sample based)
Sample time (-1 for inherited): -1
Relay Main
Switch on point: 0.9
Switch off point: 0.3
Output when on: 0
Output when off: 1
Input processing: Elements as channels (sample based)
Enable zero-crossing detection: Checked