Kyushu Electric Power Co., Inc.

Mitsubishi Heavy Industries Limited

Mitsubishi Industries, Ltd.

Kazuyuki Adachi

Takehiko Nishida

Katsuo Hashizaki

Shinji Murakami

Kouji Kurayama

Tetsuro Shigemizu

Yoshihiro Wada

Hidehiko Tajima

Katsuaki Kobayashi

Hirofumi Fujita

Hiroyuki Shibata

Masami Iida

Tomoh Akiyama

Masazumi Ohishi

Masaaki Minami

Keiichiro Tanaka

The battery state-of-charge calculation device () is provided with a SOCV calculation unit () which outputs a first state of charge calculated based on voltage data, a SOCI calculation unit () which outputs a second state of charge calculated based on current data, an estimated impedance voltage calculation unit () which calculates an impedance voltage value based on an effective state of charge and the current data, a static determination unit () which determines that the impedance voltage value remains static for a predetermined time or longer in a range identified by a predetermined threshold value and outputs the determination result; and a SOC decision unit () which, based on the determination result, outputs the first state of charge as the effective state of charge where the impedance voltage value is static and outputs the second state of charge as the effective state of charge where the impedance voltage value is not static.

Battery state-of-charge calculation device

A voltage equalization device of a power storage device provided with battery packs in which a plurality of secondary cells are connected, power converters provided in association with the battery packs, and controllers that control the power converters, and in which the battery packs are connected in parallel via the individual power converters includes a decision portion and a voltage-adjusting portion. The decision portion obtains battery-pack information regarding the states of charge/discharge of the individual battery packs and decides, for each battery pack, whether or not to perform voltage adjustment on the basis of the battery-pack information. When the decision portion decides that the voltage adjustment is to be performed, the voltage-adjusting portion generates offset instructions for adjusting the states of charge/discharge and outputs the offset instructions to the controllers of the power converters associated with the battery packs.

Voltage equalization device, method, program, and power storage system

A secondary cell control system includes a plurality of cells; a charging circuit section and a discharging circuit section. The charging circuit section charges cells selected from among said plurality of cells, and the discharging circuit section discharges cells selected from among said plurality of cells.

Secondary cell control system

A battery apparatus includes a row battery group including a plurality of series-connected row batteries including one or more battery cells; a plurality of battery management sections, corresponding to the individual row batteries, for managing the battery statuses of the corresponding row batteries; a central management section for granting unique identification information to the individual battery management sections and acquiring information about the battery statuses of the row batteries from the respective battery management sections for management; second communication lines with which the plurality of battery management sections are daisy-chained; a first communication line with which, of the plurality of battery management sections, the battery management section located at one end is connected to the central management section; and a plurality of connection switching sections, provided in the individual second communication lines between the battery management sections, for switching the connection and disconnection between the battery management sections.

Battery apparatus

It is an object to provide a battery system whose life can be extended. A cell pack having at least one lithium secondary battery that uses a manganese-based cathode material and a control unit that controls charging and discharging of the cell pack are provided, and the control unit controls charging and discharging within a low-degradation voltage range that is set on the basis of a target cell degradation rate.

Power storage system

An object is to reliably conduct cell balancing operation while suppressing deterioration of batteries and maintaining operating efficiency. When the cell balance control by the cell balancing circuitis started, the system control devicesets an on/off device corresponding to the arm where the cell balance control is conducted to the open state; and when the cell balance control is completed, and the difference between the terminal voltage of a battery pack of the arm where the cell balance control has been conducted and the terminal voltages of the battery packs of the other arms falls within a preset allowable range, sets the on/off device, which has been in the open state, to the closed state.

Power storage system including a plurality of battery modules and on/off devices or voltage converters

An object is to improve safety. Provided is a power storage system including a battery apparatus; a power converterprovided between the battery apparatusand a loadand that can control power supplied from the battery apparatusto the load; and a battery monitoring circuitthat detects an abnormality in the battery apparatus. When an abnormality in the battery apparatusis detected by the battery monitoring circuit, the power convertersupplies power stored in the battery apparatusto the loador to an internally provided internal load at or below a current value or power value that is set in advance, or alternatively, at a current value or power value that the loaddemands, within a range that does not exceed an upper limit that is set in advance.

Growing community of inventors

Fukuoka, Japan

Kazuyuki Adachi