With the increasing popularity of hybrid vehicles (HVs) and electric vehicles (EVs), the time required for their mass scrapping is also increasing. Therefore, attempts have been made to use storage batteries acquired from scrapped vehicles as fixed storage batteries; however, these batteries have not been widely used because of their lack of versatility and poor cost-effectiveness. In this study, we developed a versatile control program and hardware to use all vehicle-mounted storage batteries as stationary storage batteries regardless of the vehicle type, using the entire vehicle-mounted storage battery and parts. As a result, we realized batteries with a more stable system whose selling price was lower than that of new batteries. Moreover, attempts are in progress to develop a high-performance energy storage system that is not possible using fixed batteries by developing a system that integrates high-power (e.g., in HVs) and standard-power (e.g., in EVs) storage batteries. To use vehicle-mounted storage batteries from HVs and other vehicles as fixed storage batteries, we analyzed their charge/discharge control signal data to construct a basic algorithm for the control program, and we further succeeded in developing an original hardware design for incorporating the storage batteries into the system.
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