Gs Yuasa International Ltd.

Yuta Kashiwa

Toshiyuki Nukuda

Tokuo Inamasu

Akihiro Fujii

Seijiro Ochiai

Hiroki Matsui

Takaaki Iguchi

Toru Tabuchi

Yukiko Fujino

Mariko Kohmoto

Takanobu Araki

Yuki Sugiyama

Tokuo Inamatsu

The present invention comprises a voltage detection circuit for measuring the voltage of an assembled batteryin which power storage elementsare serially connected, a current detection resistor for detecting the current in the assembled battery, and a CPUfor calculating, inter alia, the amount of energization electricity from continuous charging or continuous discharging of the assembled battery. The CPUcontrols input/output for when the assembled batteryis charged/discharged so that ΔSOC, which is the value obtained by dividing the amount of energization electricity by the actual capacity of the assembled battery, does not exceed an upper limit ΔSOC.

Management apparatus for energy storage device, energy storage apparatus, and input/output control method for energy storage device

Based on a voltage of a secondary battery detected by a voltage measurement unit, a residual capacity is acquired from a correlation between the voltage and the residual capacity of the secondary battery stored in a memory, and a state of charge (SOC) which is a ratio of the residual capacity to a reference capacity is obtained. The reference capacity is set to a prescribed amount less than a residual capacity at full charge. Further, an information processing unit determines an abnormality of a module based on a comparison between the SOC and an SOC obtained by another method.

Energy storage device management apparatus and energy storage device management method

A charge voltage controller for a chargeable and dischargeable energy storage device including an electrode assembly having a positive electrode and a negative electrode, is configured to control upper limit voltage applied to charge the energy storage device in accordance with at least one of charge time of the energy storage device, current inputted to the energy storage device, temperature of the energy storage device, and a state of charge of the energy storage device, to inhibit potential of the negative electrode from being lower than deposition potential at which metal ions transmitting and receiving an electric charge between the positive electrode and the negative electrode are deposited at the negative electrode. The deposition potential is variable in accordance with a state of charge of the energy storage device, and/or charge time of the energy storage device, and/or current inputted to the energy storage device, and/or temperature of the energy storage device.

Charge voltage controller for energy storage device, energy storage apparatus, battery charger for energy storage device, and charging method for energy storage device

An embodiment provides a charge voltage controller for a chargeable and dischargeable energy storage device including an electrode assembly having a positive electrode and a negative electrode, the charge voltage controller configured to control upper limit voltage applied to charge the energy storage device in accordance with at least one of charge time of the energy storage device, current inputted to the energy storage device, temperature of the energy storage device, and a state of charge of the energy storage device, to inhibit potential of the negative electrode from being lower than deposition potential at which metal ions transmitting and receiving an electric charge between the positive electrode and the negative electrode are deposited at the negative electrode.

It is an object of the present invention to provide a positive electrode material having a large ratio of the discharge capacity around 4 V to the total discharge capacity including the discharge capacity at 4V or lower while making the discharge capacity around 4 V sufficient, for the purpose of providing a lithium secondary battery using a lithium transition metal phosphate compound excellent in thermal stability, utilizing the discharge potential around 4V (vs. Li/Li) that is higher than the discharge potential of LiFePO, and being advantageous with respect to the detection of the end of discharge state, and a lithium secondary battery using the same. The present invention uses a positive active material for a lithium secondary battery containing a lithium transition metal phosphate compound represented by LiMnFeCoPO(0.1&#x2266;x&#x2266;0.2, 0&#x3c;y&#x2266;0.2).

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Kyoto, Japan

Yuta Kashiwa