MANUFACTURING METHOD OF RECHARGEABLE SECONDARY BATTERY

To provide a manufacturing method of a rechargeable secondary battery that can provide a rechargeable secondary battery, in which a rechargeable secondary battery manufactured by combining a plurality of used secondary batteries can be adapted to the application as a product, a warranty period, etc., and that can be charged and discharged by efficiently using the capacity of each of the plurality of used secondary batteries constituting the rechargeable secondary battery.SOLUTION: In a method of manufacturing a rechargeable secondary battery 10 by combining a plurality of used battery cells C1 to Cn, the degree of deterioration of used battery cells C1 to Cn is estimated, the used battery cells C1 to Cn are classified into a plurality of groups according to the estimated degree of deterioration, and multiple used battery cells C1 to Cn classified into the same group are combined to manufacture the plurality of groups of rechargeable secondary batteries 10.SELECTED DRAWING: Figure 2 【課題】複数の使用済み二次電池を組み合わせて製造する再生二次電池を製品としての用途や保証期間等に適応させることができると共に、再生二次電池を構成する複数の使用済み二次電池の各々の容量を効率良く使って充放電できる再生二次電池を提供できる、再生二次電池の製造方法を提供する。【解決手段】複数の使用済みの電池セルＣ１～Ｃｎを組み合わせて再生二次電池１０を製造する方法であって、使用済みの電池セルＣ１～Ｃｎの劣化度を推定し、推定された劣化度に応じて使用済みの電池セルＣ１～Ｃｎを複数群に分類し、同じ群に分類された複数の使用済みの電池セルＣ１～Ｃｎを組み合わせることにより複数群の再生二次電池１０を製造する。【選択図】図２