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Abstract

A deterioration-state prediction method is for calculating a cause-based deterioration state 25 for each cause of deterioration and predicting a deterioration state 26 of a secondary battery 1 based on a plurality of the cause-based deterioration states 25. Each of the cause-based deterioration states 25 is calculated based on: a previous cause-based deterioration state 21, which is the cause-based deterioration state 25 at a time point a first time period ago; and a unit cause-based deterioration state indicating deterioration during the first time period, while considering; time dependence varying depending on the cause of deterioration and following a power law with respect to an elapsed time of the cause-based deterioration state 25; and a deterioration rate varying depending on the cause of deterioration and determined based on a use condition 22 at the time of prediction.

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