Mitsubishi Electric Corporation

Takahito Ida

Satoshi Hara

Shigeru Aihara

Toshihiro Wada

Makiko Kise

Hisatoshi Fukumoto

Hiroki Ishihara

Tomoki Takegami

Hiroto Nishiguchi

Keisuke Ogasawara

Provided is a charging/discharging control device which, for an assembled battery including a plurality of storage batteries connected in series, detects capacity variation among the storage batteries and controls charging/discharging of the assembled battery. The charging/discharging control device includes a charging/discharging controller which calculates an electric-charge-quantity corresponding value which is a value corresponding to an electric charge quantity of the assembled battery, on the basis of a current value of the assembled battery, and calculates, as a voltage second-order derivative value, a value obtained through second-order differentiation of open-circuit voltage of the assembled battery with respect to the electric-charge-quantity corresponding value. When a predetermined charging-stop condition is satisfied, the charging/discharging controller performs control to stop charging, and determines whether or not there is capacity variation among the plurality of storage batteries in the assembled battery, on the basis of the voltage second-order derivative value when the charging-stop condition is satisfied.

Charging/discharging control device and charging/discharging control method

In a storage battery system charging control device, on the basis of estimated temperature data until the end of life of a storage battery calculated by a power estimation unit, an ambient temperature estimation unit, and a temperature estimation unit, and a deterioration coefficient stored in a data storage unit, a capacity retention calculation unit sequentially calculates capacity retention data with respect to each state of charge until the end of life of the storage battery, using the state of charge as a parameter. A cumulative capacity calculation unit calculates a cumulative capacity corresponding to each state of charge, on the basis of the rated capacity of the storage battery and the capacity retention data. A charging control voltage determination unit determines charging control voltage on the basis of the cumulative capacities calculated by the cumulative capacity calculation unit.

Storage battery system charging control device, storage battery system, and storage battery charging control method

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

The present invention provides a storage-battery control devicecapable of enhancing economical efficiency by controlling charge state of a storage batteryso that surplus power generated by photovoltaic generation can be entirely charged into the storage batteryeven in a case where power cannot be sold to a system power supply. A storage-battery control deviceaccording to the present invention includes a load-power prediction deviceto predict load power, a PV-power prediction deviceto predict generated power by photovoltaic power generation, and a system controllerto obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segmenthaving a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, to control the charge state of a storage batteryat the start point so that the predicted charge amount can be charged in the prediction segment, wherein an end point of the prediction segmentis a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching the maximum value of the generated power.

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Chiyoda-ku, Japan

Takahito Ida