Abstract
Lithium-ion Batteries (LiB) are increasingly used in automobiles and buildings since around 2010. Although the lifetime of several years is long enough for LiB used in small electronic devices, a life time of more than 10 years will be required for LiB in infrastructures However, many LiB users are reporting uncertainty of the life time of LiB. This is one of the major problems which prevent LiB from spreading to society. Therefore, it is important to predict the degradation of battery performance and the lifetime of LiB based on the present performance. It will decide proper installation place of used battery and how to use them in the future. The authors developed an evaluation model of used LiBs. The model contains two elements: (1) degradation speed database of experiments and (2) the modeling of use pattern and condition of LiB.
