Modeling of a Pouch Lithium Ion Battery Using a Distributed Parameter Equivalent Circuit for Internal Non-Uniformity Analysis
Abstract
:1. Introduction
2. Experiments
2.1. Parameters Identification Experiments
2.1.1. Parameters Identification of the Lumped First-Order Resistor-Capacitor (RC) Model
2.1.2. Entropy Change Measurement
2.2. Validation Experiments
3. Modeling and Validation
3.1. Electrical Model
3.2. Thermal Model
3.3. Solution
4. Results and Discussion
4.1. Non-Uniformity Distribution at the Initial State
4.2. Non-Uniformity Evolution During Discharge
4.3. Limitation of Technique
5. Conclusions
- The initial non-uniformity of current density inside a 35-Ah NCM pouch cell is caused by the electrode foil resistance and relatively narrow tab.
- The current flow through the sub-models close to tabs is higher than that at the center at the beginning of discharge, because the potential drops in positive and negative foils.
- A current cross point exists during the constant discharge process. The local SOC difference increases with the reduction of the average SOC until the average SOC arrives at that point and then decreases until the average SOC arrives at zero.
- The current flow through the sub-models close to tabs becomes lower than that at the center at the end of discharge due to the accumulation of the local SOC difference, rapid OCV drop and rapid resistance increase.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Component | Thickness | Heat Conductivity Coefficient | Specific Heat Capacity | Electrical Resistivity |
---|---|---|---|---|
(μm) | (w·m·k) | (J·kg·k) | (Ω·m) | |
Positive foil | 20 | 238 | 903 | |
Positive material | 160 | 3.9 | 839 | — |
Separator | 40 | 0.33 | 1978 | — |
Negative material | 110 | 3.3 | 1064 | — |
Negative foil | 10 | 398 | 385 |
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Chen, D.; Jiang, J.; Li, X.; Wang, Z.; Zhang, W. Modeling of a Pouch Lithium Ion Battery Using a Distributed Parameter Equivalent Circuit for Internal Non-Uniformity Analysis. Energies 2016, 9, 865. https://doi.org/10.3390/en9110865
Chen D, Jiang J, Li X, Wang Z, Zhang W. Modeling of a Pouch Lithium Ion Battery Using a Distributed Parameter Equivalent Circuit for Internal Non-Uniformity Analysis. Energies. 2016; 9(11):865. https://doi.org/10.3390/en9110865
Chicago/Turabian StyleChen, Dafen, Jiuchun Jiang, Xue Li, Zhanguo Wang, and Weige Zhang. 2016. "Modeling of a Pouch Lithium Ion Battery Using a Distributed Parameter Equivalent Circuit for Internal Non-Uniformity Analysis" Energies 9, no. 11: 865. https://doi.org/10.3390/en9110865