Primearth Ev Energy Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Yosuke Murota

Daisuke Koba

Tetsuya Osaka

Junichi Matsumoto

Suguru Muraki

Kazuki Nakano

Jun Satoh

Shinobu Minatani

Takayuki Irie

Hiroki Nakafuji

Daisuke Shinohara

A battery system includes a nickel-metal hydride battery and an ECU that controls charging and discharging of the nickel-metal hydride battery. The ECU calculates a discharge electricity amount showing an integrated value of a current discharged from the nickel-metal hydride battery, and further calculates ΔSOC of the nickel-metal hydride battery in a prescribed time period. The ECU calculates a charge reserve capacity of the nickel-metal hydride battery based on a temperature of the nickel-metal hydride battery, the discharge electricity amount, and the ΔSOC.

Battery system and method of controlling battery system

A battery state estimation device for estimating a charged electric charge quantity of a rechargeable battery includes an impedance measurement unit configured to measure a plurality of complex impedances of the rechargeable battery by supplying measurement power to the rechargeable battery, a parameter calculation unit configured to calculate a parameter that includes a ratio of a difference between measurement angular velocities of two complex impedances in a diffusion region among the measured complex impedances to a difference between components of the two complex impedances, and an electric charge quantity estimation unit configured to estimate a charged electric charge quantity of the rechargeable battery based on the calculated parameter and preset correlated information between the charged electric charge quantity of the rechargeable battery and the parameter.

Battery state estimation device and battery state estimation method

Growing community of inventors

Toyohashi, Japan

Yosuke Murota