A backup device includes: a charging unit that charges a second power source unit on the basis of the power supply from a first power source unit; a voltage detection unit detects the output voltage of the second power source unit; a vehicle speed information acquisition unit acquires vehicle speed information; and a control unit sets, on the basis of at least the vehicle speed information acquired by the vehicle speed information acquisition unit, a charging target voltage according to a setting method in which the voltage is set higher as the vehicle speed indicated by the vehicle speed information is greater, and causes, on the basis of the output voltage of the second power source unit detected by the voltage detection unit, the charging unit to perform the charging operation so as to bring the output voltage of the second power source unit close to the charging target voltage.

A backup device includes: a charging unit that charges a second power source unit on the basis of the power supply from a first power source unit; a voltage detection unit detects the output voltage of the second power source unit; a vehicle speed information acquisition unit acquires vehicle speed information; and a control unit sets, on the basis of at least the vehicle speed information acquired by the vehicle speed information acquisition unit, a charging target voltage according to a setting method in which the voltage is set higher as the vehicle speed indicated by the vehicle speed information is greater, and causes, on the basis of the output voltage of the second power source unit detected by the voltage detection unit, the charging unit to perform the charging operation so as to bring the output voltage of the second power source unit close to the charging target voltage.

The present invention describes a method using temperature data to protect battery health during bidirectional charging in conjunction with monetization activities. The method includes receiving temperature data and determining anticipated energy needs of a building. The temperature data includes at least the temperature of one or more electric vehicle batteries or information required to determine the temperature of the one or more electric vehicle batteries while the anticipated energy needs are relative to ambient air temperature. The method includes determining an amount of discharge of the one or more electric vehicle batteries required to offset the anticipated needs of the building by a predetermined amount and determining based on the temperature data whether discharging the one or more electric vehicle batteries would be harmful to the health of the one or more electric vehicle batteries. The method includes discharging the one or more electric vehicle batteries to offset the anticipated needs of the building.

The present invention describes a method using temperature data to protect battery health during bidirectional charging in conjunction with monetization activities. The method includes receiving temperature data and determining anticipated energy needs of a building. The temperature data includes at least the temperature of one or more electric vehicle batteries or information required to determine the temperature of the one or more electric vehicle batteries while the anticipated energy needs are relative to ambient air temperature. The method includes determining an amount of discharge of the one or more electric vehicle batteries required to offset the anticipated needs of the building by a predetermined amount and determining based on the temperature data whether discharging the one or more electric vehicle batteries would be harmful to the health of the one or more electric vehicle batteries. The method includes discharging the one or more electric vehicle batteries to offset the anticipated needs of the building.

A vehicle includes a controller and a display. The controller is configured to calculate a capacity retention (a degree of deterioration) based on measurement data of a main battery. The controller estimates an upper limit value and a lower limit value of an error (range) of the calculated capacity retention. The controller calculates a capacity retention range including the upper limit value Wu and the lower limit value. The controller has the display show the calculated capacity retention range.

A vehicle includes a controller and a display. The controller is configured to calculate a capacity retention (a degree of deterioration) based on measurement data of a main battery. The controller estimates an upper limit value and a lower limit value of an error (range) of the calculated capacity retention. The controller calculates a capacity retention range including the upper limit value Wu and the lower limit value. The controller has the display show the calculated capacity retention range.

In a management device that manages a power storage module, a voltage measuring unit measures n pieces of voltages across respective n power storage blocks. A ranking unit assigns ranks to the voltages measured across the n power storage blocks in descending order from high to low or in ascending order from low to high. A frequency distribution data generator compiles ranks assigned to voltages measured across the respective n power storage blocks during a set period and generates data about frequency distribution of the ranks for the measured voltages. An abnormality determiner detects an abnormality when information about the ranks differs from information about ranks for the power storage blocks in a normal state.

In a management device that manages a power storage module, a voltage measuring unit measures n pieces of voltages across respective n power storage blocks. A ranking unit assigns ranks to the voltages measured across the n power storage blocks in descending order from high to low or in ascending order from low to high. A frequency distribution data generator compiles ranks assigned to voltages measured across the respective n power storage blocks during a set period and generates data about frequency distribution of the ranks for the measured voltages. An abnormality determiner detects an abnormality when information about the ranks differs from information about ranks for the power storage blocks in a normal state.

A lithium ion secondary battery includes a positive electrode including a positive electrode active material layer containing lithium iron phosphate, a negative electrode including a negative electrode active material layer containing graphite, and an electrolyte including a lithium salt and a solvent including ethylene carbonate and diethyl carbonate between the positive electrode and the negative electrode. When the battery temperature of the lithium ion secondary battery or the temperature of an environment in which the lithium ion secondary battery is used is T and given temperatures are T1 and T2 (T1<T2), in the case where T<T1, constant current charge is performed until voltage reaches a given value and then constant voltage charge is performed; in the case where T1≤T<T2, only constant current charge is performed; and in the case where T2≤T, charge is not performed.

A lithium ion secondary battery includes a positive electrode including a positive electrode active material layer containing lithium iron phosphate, a negative electrode including a negative electrode active material layer containing graphite, and an electrolyte including a lithium salt and a solvent including ethylene carbonate and diethyl carbonate between the positive electrode and the negative electrode. When the battery temperature of the lithium ion secondary battery or the temperature of an environment in which the lithium ion secondary battery is used is T and given temperatures are T1 and T2 (T1<T2), in the case where T<T1, constant current charge is performed until voltage reaches a given value and then constant voltage charge is performed; in the case where T1≤T<T2, only constant current charge is performed; and in the case where T2≤T, charge is not performed.