Abstract: A battery information management system includes: a battery characteristic calculation unit calculating a battery characteristic for each of a plurality of unit cells; a transmission unit transmitting value information that includes the battery characteristic of each unit cell, unit cell identification information, and time information; and a distributed-type database network recording the value information of each unit cell. A specific node of the distributed-type database network includes a reception unit configured to receive the value information transmitted from the transmission unit, and a transaction delivery unit configured to deliver, to the plurality of nodes, a transaction of recording the value information.

Abstract: A rental information generation device includes: a requirement information acquisition unit configured to acquire requirement information of a user regarding use of an electric vehicle equipped with a secondary battery; a stock information acquisition unit configured to acquire stock information of objects including at least either one of a secondary battery and an electric vehicle; a decision unit configured to decide an object selection condition on the basis of the acquired requirement information and stock information; and a generation unit configured to generate rental information regarding an object to be rented out to the user on the basis of the decided selection condition.

Abstract: An internal resistance calculation device is provided with: a voltage obtaining portion that obtains the voltage of a secondary battery; a current obtaining portion that obtains the current of the secondary battery; a switching determination portion that determines the presence or absence of switching between charging and discharging of the secondary battery based on the obtained current; an identification portion that identifies a waiting time based on a boundary frequency range in which the diffusion impedance arising from the process of diffusion of a predetermined ion contributes to the impedance of the secondary battery in the impedance spectrum of the secondary battery; and a resistance calculation portion that calculates the internal resistance of the secondary battery based on the voltage and the current obtained after the identified waiting time in a case where it is determined that switching between charging and discharging of the secondary battery is present.

Abstract: An internal resistance calculation device is provided with: a voltage obtaining portion that obtains the voltage of a secondary battery; a current obtaining portion that obtains the current of the secondary battery; a switching determination portion that determines the presence or absence of switching between charging and discharging of the secondary battery based on the obtained current; an identification portion that identifies a waiting time based on a boundary frequency range in which the diffusion impedance arising from the process of diffusion of a predetermined ion contributes to the impedance of the secondary battery in the impedance spectrum of the secondary battery; and a resistance calculation portion that calculates the internal resistance of the secondary battery based on the voltage and the current obtained after the identified waiting time in a case where it is determined that switching between charging and discharging of the secondary battery is present.