Mitsubishi Electric Corporation

Keisuke Ogasawara

Hiroyuki Saito

Satoshi Wachi

Toshihiro Wada

Hideaki Tani

Tomoki Takegami

Hiroto Nishiguchi

Takahito Ida

A charge and discharge control device includes a storage charge level determining unit that selects one range from a first charge level range lower than a second charge level range and a third charge level range higher than the second charge level range, and determines a charge level at storage during which charge and discharge of a battery are not performed. The second charge level range can be a range of charge level including a maximum value of storage degradation, and the storage degradation can be degradation of the battery over time. The charge and discharge control device can further comprise a charge and discharge control unit that controls charge and discharge of the battery on the basis of the charge level at storage.

Charge and discharge control device and charge and discharge control method including first, second, and third charge level ranges

The battery degradation detection device includes an impedance measurement unit and a degradation detection unit. The impedance measurement unit measures impedances of a battery at a plurality of frequencies. The impedance for at least one of the plurality of frequencies, measured by the impedance measurement unit, has a positive imaginary component. The degradation detection unit detects degradation of the battery on the basis of real components of the impedances at the plurality of frequencies detected by the impedance measurement unit.

Battery degradation detection device and battery temperature estimation device

A storage battery cooling control device includes a system power calculator () configured to calculate power of an external power source as power information, and a charge/discharge control unit () configured to perform charge/discharge control of a storage battery based on the power information, and to perform power control of a cooling device by distributing power to the cooling device within a cooling power threshold, which is determined so that a heat generation increment of the storage battery is equal to or less than a heat exhaust increment of the cooling device calculated from a cooling air flow rate.

Storage battery cooling control device and storage battery cooling control method

Final state-of-charge calculation means is provided which calculates a final state-of-charge of the battery according to state-of-charge estimate values by electric current integration mode state-of-charge estimation means and equivalent circuit model mode state-of-charge estimation means. The final state-of-charge calculation means performs, when a difference between the state-of-charge estimate value by the electric current integration mode state-of-charge estimation means and the state-of-charge estimate value by the equivalent circuit model mode state-of-charge estimation means becomes less than or equal to the state-of-charge difference threshold value, switching of the final state-of-charge from the state-of-charge estimate value by the electric current integration mode state-of-charge estimation means to the state-of-charge estimate value by the equivalent circuit model mode state-of-charge estimation means.

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Tokyo, Japan

Keisuke Ogasawara