Toyota Jidosha Kabushiki Kaisha

Takuro Hayashi

Keiichi Minamiura

Masahiro Kagami

An electric power storage system for a vehicle includes an electric power storage device, a temperature sensor, and a controller. The vehicle includes an ignition switch. The electric power storage device is mounted on the vehicle. The temperature sensor is configured to detect a temperature of the electric power storage device. The controller is configured to estimate a rest temperature of the electric power storage device at a time when the ignition switch is OFF. The controller is configured to acquire the temperature of the electric power storage device at a time when the ignition switch is ON by using the temperature sensor when the ignition switch is turned ON. The controller is configured to estimate the rest temperature by using an average value of at least two of a plurality of the temperatures acquired during a predetermined period. The plurality of temperatures are the temperatures of the electric power storage device which are acquired at a time when the ignition switch is turned ON during the predetermined period.

Electric power storage system for a vehicle and method for controlling electric power storage system for a vehicle

An ECU of an electric vehicle supplies a target rotation speed RT having a value corresponding to the temperature TB of a main battery to a cooler, controls a main DC/DC converter such that the SOC of an auxiliary battery is in a predetermined range SOCL to SOCH less than 100% when a cooling fan in the cooler is driven at the target rotation speed (RT), and controls the main DC/DC converter such that the SOC of the auxiliary battery is 100% when the cooling fan is not driven at the target rotation speed (RT).

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Kariya, Japan

Takuro Hayashi