To address the demand for improving operational economy in electric hydrogen systems, a capacity optimization configuration method of electric hydrogen systems is proposed with hierarchical control of decommissioned power batteries considering time-sharing tariff. The remaining energy decay rate of decommissioned power batteries is analyzed and a hierarchical control strategy is presented to extend their service lives. On this basis, an operational control strategy is designed that prioritizes electric load satisfaction and powers the electrolyzer using decommissioned batteries. A capacity optimization configuration model of the electric hydrogen system incorporating the time-sharing tariff mechanism is established. Case study results demonstrate that under consideration of time-sharing tariff and hierarchical control strategies, the operational cost reaches approximately \mathrm{\yen } 239 800. This configuration exhibits superior economic performance and applicability compared to both hierarchical control strategies with new batteries and integrated control strategies with decommissioned batteries. Moreover, the decay rate of decommissioned batteries under this strategy measures about 52% of that observed in integrated control strategies.