The implementation of consecutive orthogonal array method on searching optimal five step charging pattern for lithium-ion batteries

Lithium-ion (Li-ion) batteries have become the major power source for today's electronic products because they have advantages such as high energy density, low maintenance requirement, high open circuit voltage (OCV), low self-discharge rate and lack of memory effect. The performance and lifespan of Li-ion batteries are closely related to the quality of the charging pattern. Therefore, an optimal charging pattern is essential for Li-ion batteries. In this paper, a Taguchi-based algorithm is presented. Consecutive orthogonal array (COA) techniques are utilized to determine the optimal five step constant current charging patterns. Experimental results show that the obtained charging pattern is capable of charging the Li-ion batteries to 95% capacity. Comparing to the conventional constant current-constant voltage (CC-CV) method, the benefits of the obtained pattern are faster and safer charging and longer battery cycle life.