Simulation of the Process of Discharging a Lithium-Ion Battery in Relation to the Sensitivity of Its Parameters

Research on heat generation for a Lithium-ion battery during the discharging process is of great practical importance. Mainly because the heat generation whilst discharging directly affects the safety, performance, and lifetime of the battery. This study proposes a method to analyze the heat generation in a battery model with regards to a series of physical and electrochemical parameters. A group of mathematical equations are developed to describe the electrochemical behavior. These equations are solved using finite element analysis. The report also studies the relationship of the generated heat of the battery with parameters such as the active material particle size, electrode surface density, and reaction coefficient. By optimizing the negative electrode particle size, the value of maximum temperature rising could be reduced by 10°C. The irreversible heat accounts for a large proportion of the total generated heat. By optimizing the electrode surface density, the maximum rise of temperature would be reduced by 21.6°C. The result shows that physicochemical parameters of the Lithium- ion battery have a significant effect on battery heat generation.