Mitsubishi Heavy Industries Limited

Kyushu Electric Power Co., Inc.

Yoshihiro Wada

Takehiko Nishida

Kazuyuki Adachi

Shinji Murakami

Tetsuro Shigemizu

Katsuo Hashizaki

Kouji Kurayama

Hiroyuki Shibata

Toyoaki Yasui

Hidehiko Tajima

Katsuaki Kobayashi

Katsuyasu Hananaka

Yozo Nakamura

Toshirou Kobayashi

Yukio Kodama

Masanobu Misaki

Masami Iida

Hirofumi Fujita

Tomoh Akiyama

Masazumi Ohishi

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 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

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

A high wear resistant hard film is characterized by including a coating layer consisting of a metal nitride, which is formed on the outside surface of an object to be treated; a substrate layer consisting of a nitride of Ti or Cr, which is provided between the coating layer and the object to be treated; and an intermediate layer containing compositions of the coating layer in contact with the intermediate layer and the substrate layer, which is provided at an interface between the coating layer and the substrate layer, and a tool is provided with the film. There is provided a hard film having excellent oxidation resistance even 1000&#xb0; C. or higher and also having very high wear resistance.

High wear resistant hard film

A high wear resistant hard film is characterized by including a coating layer consisting of a metal nitride, which is formed on the outside surface of an object to be treated; a substrate layer consisting of a nitride of Ti or Cr, which is provided between the coating layer and the object to be treated; and an intermediate layer containing compositions of the coating layer in contact with the intermediate layer and the substrate layer, which is provided at an interface between the coating layer and the substrate layer, and a tool is provided with the film. There is provided a hard film having excellent oxidation resistance even at 1000&#xb0; C. or higher and also having very high wear resistance.

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Fukuoka, Japan

Yoshihiro Wada