State-of-health meter fabricated using ultraviolet laser system for rapid evaluation of lithium-ion batteries

摘要

This study involved developing a meter for rapidly evaluating the state of health (SOH) of lithium-ion batteries (LIBs). The key component was a magnetic induction antenna (MIA) module with an interdigital pattern fabricated using a 355-nm pulsed ultraviolet laser system. For inducing high voltage from the LIB to the MIA module for evaluating the SOH, interdigital patterns of four line widths (i.e., 0.25, 0.5, 0.75, and 1.0 mm) were designed. The experimental results indicate that patterns with wider lines induce higher voltages. However, patterns using the 0.75-mm line offer optimal SOH measurements, because those with the 1.0-mm line yielded lower power storage. The optimal operating frequency for enhancing SOH identification was found to be 700 kHz. In addition, this study established an empirical equation for expressing the relationship between the induced voltage and SOH of LIBs.