Power supply system, heating control method, and heating control program
View Patent ↗A heater heats a battery. A voltage measurement unit measures a voltage of the battery. A temperature measurement unit measures a temperature of the battery. A controller determines that the measured temperature of the battery, which is measured by the temperature measurement unit, is a temperature at which the heater is started, and controls a heating amount from the heater to the battery adaptively according to a voltage difference between the measured voltage during discharging of the battery and a reference voltage. For instance, the controller increases the heating amount as a voltage difference between a discharging lower limit voltage and the measured voltage during low-temperature discharging of the battery becomes small.
1 . A power supply system comprising:
a battery:
a heater for heating the battery;
a voltage measurer that measures a voltage of the battery;
a temperature measurer that measures a temperature of the battery; and
a controller that determines whether the measured temperature of the battery measured by the temperature measurer is a temperature at which the heater is started, and controls a heating amount from the heater to the battery adaptively, according to a voltage difference between the measured voltage during discharging of the battery and a reference voltage, wherein
the controller increases the heating amount as a voltage difference between the measured voltage during discharging of the battery and a discharging lower limit voltage decreases.
2 . The power supply system according to claim 1 , wherein the controller adjusts the heating amount to a predetermined heating amount for a predetermined time from when discharging of the battery is started.
3 . The power supply system according to claim 1 , wherein a maximum value of the heating amount is set based on an allowable temperature at a local highest temperature position in the battery as a reference.
4 . The power supply system according to claim 1 , wherein the power supply system is mounted in an electric vehicle.
5 . The power supply system according to claim 4 , wherein when a distance between a current position of the electric vehicle and a destination of the electric vehicle is less than a set value, the controller reduces the heating amount or sets the heating amount to zero.
6 . The power supply system according to claim 4 , wherein the controller changes intensity of heating control according to selection of a user.
7 . The power supply system according to claim 4 , wherein the controller supplies regenerative power to the heater without supplying the regenerative power to the battery, the regenerative power being supplied from the electric vehicle.
8 . A heating control method comprising:
obtaining a measured voltage of a battery;
obtaining a measured temperature of the battery; and
controlling a heating amount adaptively according to a voltage difference between the measured voltage during discharging of the battery and a reference voltage, at low temperature at which the measured temperature of the battery is less than or equal to a predetermined temperature, the heating amount being supplied to the battery from a heater for heating the battery, wherein
the controlling increases the heating amount as a voltage difference between the measured voltage during discharging of the battery and a discharging lower limit voltage decreases.
9 . A non-transitory machine-readable recording medium that stores a heating control program executed by a computer, the heating control program comprising:
processing that obtains a measured voltage of a battery;
processing that obtains a measured temperature of the battery; and
processing that controls a heating amount adaptively according to a voltage difference between the measured voltage during discharging of the battery and a reference voltage, at low temperature at which the measured temperature of the battery is less than or equal to a predetermined temperature, the heating amount being supplied to the battery from a heater for heating the battery, wherein
the process controlling the heating amount increases the heating amount as a voltage difference between the measured voltage during discharging of the battery and a discharging lower limit voltage decreases.