A statistical method for analyzing lifetime of a battery pack

In order to support sustainability, a large variety of secondary batteries are necessary, each of which is a battery pack composed of many cells connected in series and parallel. Such battery packs must have connections suitable to its application; however, optimality cannot be claimed deterministically in the design stage, since battery behavior heavily depends on the environment of usage and the variability of production. To cope with this situation, we propose a statistical method for analyzing the lifetime distribution of a battery pack composed of plural cells, given aging curve and its distribution of a single cell. Then, we show a few experimental results to evaluate the performance of the proposed method.