Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Yoshiki Sugino

Nobuyuki Tanaka

Yoshihiro Uchida

Tetsuya Watanabe

Junta Izumi

Hiroki Nagai

Kazuki Kubo

Yuki Sugo

Shunya Kobayashi

Takahiro Noguchi

Kimihito Nakamura

Kentaro Suzuki

Daisuke Okanishi

Ryota Takizawa

Masanari Ishikawa

Ryo Inoue

The battery system includes a secondary battery, a voltage sensor, a current sensor, a temperature sensor, and a processor. The processor is configured to calculate a polarization overvoltage by subtracting a voltage drop amount caused by a DC resistance and a reactive resistance of the secondary battery determined in accordance with a temperature and an SOC of the secondary battery from a voltage difference between OCV and CCV of the secondary battery.

Battery system, vehicle including the same, and method for monitoring secondary battery

A vehicle includes: an instrument panel; and an ECU that controls the instrument panel so that the instrument panel displays an icon representing a status of a battery. The icon represents one of a first indication and a second indication by an increase or decrease of a scale in a display region of the icon, and the other one of the first indication and the second indication by an amount indicated by a size of a display area of the icon, the first indication representing SOC of the battery, the second indication representing a full charge capacity of the battery.

Display system and vehicle including the same, and method of display of status of secondary battery

An estimation system, includes: a secondary battery; a monitoring device that detects a voltage and a current of the secondary battery; and a processor that estimates a full charge capacity of the secondary battery using a detection result of the monitoring device. The processor calculates a first charging rate of the secondary battery using a current integration amount in charging, discharging, or charging and discharging of the secondary battery and using a full charge capacity of the secondary battery that was estimated last time; calculates a second charging rate of the secondary battery using an open circuit voltage of the secondary battery, when a predetermined time has elapsed without charging and discharging since the first charging rate is calculated; and performs correction, when a magnitude of a difference between the first and second charging rates is larger than a threshold, on the full charge capacity based on the difference.

Estimation system and estimation method

A battery system includes a controller that performs a calculation to calculate an internal resistance of a battery, and executes a predetermined operation based on the result. The calculation includes obtaining a regression line through a regression analysis of a current-voltage plot obtained from voltage sensor and current sensor, and calculating the internal resistance from a slope of the regression line. The controller calculates a first internal resistance through the calculation based on a first group of detection values of the voltage and current detected a plurality of times, and calculate a second internal resistance through the calculation based on a second group of detection values. The controller executes the predetermined operation when a resistance difference between the first and second internal resistances is smaller than a reference value, and does not execute the operation when the resistance difference is larger than the reference value.

Battery system

Growing community of inventors

Seto, Japan

Yoshiki Sugino