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Proposing a Hybrid Method for Estimating the Health of Lithium-Ion Batteries

Mirzaei, Saeideh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58276 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sattari, Sorena; Moeini Eghtaei, Moein
  7. Abstract:
  8. The battery is the most important electrochemical device in electrical systems. One key feature of a battery is its durability. Over time and after repeated use, the energy and capacity of a battery decrease due to the loss of active materials. When the battery's capacity reaches a threshold value, it must be replaced; otherwise, there is a risk of damage to the entire system. Given the importance of this issue, extensive research has been conducted to estimate the health status of batteries, and the lifespan of lithium-ion batteries has improved in recent years. Various methods have been employed to assess battery health, and it seems that using these methods in a hybrid manner could combine the benefits of two different approaches. The main objective of this research is to hybridize an electrochemical model with a thermal circuit model to accurately estimate the battery's health. For this purpose, three concentration determination functions were used in the electrochemical section, and the concentration function with the highest accuracy was selected. Considering the temperature dependence of the electrochemical model and the effect of temperature on battery degradation, the cell temperature was determined using a thermal circuit, and the resulting temperature corrected the degradation and electrochemical subsections. The voltage response was compared with simulation results from MATLAB, and the heat generated by the thermal section was compared with results from Ansys Fluent software. Finally, using the hybrid model, the battery health index was evaluated under specific conditions, and the results confirmed that temperature directly impacts this index
  9. Keywords:
  10. Lithium Batteries ; Battery Health ; Battery Degradation ; Electrochemical Method ; Thermal Method ; Battery Degradation Causes

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