Investigation of Open Circuit Potential of Lithium-Ion Battery by The Taguchi Design

Lithium-ion batteries are widely used in electric vehicles. A robust battery management system is a very important issue for lithium-ion batteries due to the safety of electric vehicles. In this study, simultaneous main influences of charg-ing factors on open circuit potential were statistically determined by using the Taguchi design. The response table and variance analysis were performed to de-termine the significant charging factors on a lithium-ion battery. The results showed that the battery potential was the most influential charging factor to the open circuit potential. Furthermore, the statistically significant correlation be-tween each charging factor and open circuit potential was determined based on a 95% significance level. The interactions between charging factors were demon-strated by the non-parallel lines presented on the interaction plots. The findings can guide the battery management and control methods for lithium-ion batteries used in electric vehicles.