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soc-estimation-of-li-ion-batteries

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State of Charge Estimation of Li-ion Batteries using Extended Kalman Filter

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# State of Charge Estimation of Li-ion Batteries using Extended Kalman Filter
- Refer to [EKF.ipynb](EKF.ipynb)

## Open Source Datasets Used
### [LG 18650HG2](https://data.mendeley.com/datasets/cp3473x7xv/3)
- Kollmeyer, Phillip; Vidal, Carlos; Naguib Mina; Skells, Michael  (2020), “LG 18650HG2 Li-ion Battery Data and Example Deep Neural Network xEV SOC Estimator Script”, Mendeley Data, V3, doi: 10.17632/cp3473x7xv.3

## Battery Models Used
### RC2 model:
- ![rc2](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/rc2.jpg)

| r0       | r1       | r2       | tau1         | tau2        |
|----------|----------|----------|--------------|-------------|
| 0.019414 | 0.014601 | 0.656103 | 19.860964    | 54272.69185 |

- Some model shortcomings:
    - One cell parameter set is used for the entire SOC range.
    - There is no hysteresis component in this model, thus Irc1 compensates for this.
    - SOC values drift from true values due to the above as well.

## OCV-SOC curve and cell modelling
- Refer to [Data Driven Modelling of Li-ion Batteries](https://github.com/raghuramshankar/data-driven-modelling-of-li-ion-batteries)
- ![ocv-soc](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/ocv-soc.png)

## Kalman Filter plots
- ![soc](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/soc.png)
- ![voltage](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/voltage.png)
- ![irc](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/irc.png)
- ![sigma](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/sigma.png)
- ![innovation](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/innovation.png)
- ![docvsoc](https://raw.githubusercontent.com/raghuramshankar/soc-estimation-of-li-ion-batteries/main/images/docvsoc.png)

## License
[MIT License](LICENSE)

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