Hitachi Chemical Company, Ltd.

Shin-kobe Electric Machinery Co., Ltd.

Hisaaki Takabayashi

Keiko Abe

Masahiro Watanabe

Yoshikazu Hirose

Yasuhiro Kobayashi

Ichiro Shimoura

Hideki Inoue

Shinichi Sano

Toshiyuki Sawa

Toshiyuki Furukawa

Keisuke Fukuhara

An accumulator and state of charge evaluation method for preparing, during charging and discharging, models for each of deterioration degrees, each representing a relationship between terminal voltage, current and state of charge, for selecting respective models for the times during charging and discharging in accordance with a total charging/discharging amount (Ah), a deterioration degree or an elapsed time of an operation of the accumulator, for further estimating state of charge from current accumulation, and for determining a final state of charge from estimated states of charge including a present state of charge estimated from the models for the times during charging and discharging of the accumulator, while using a time or a total charging/discharging amount (Ah) from a time of full-charging by equal charging of the accumulator up to present time to determine the final state of charge from the plurality of states of charge.

Accumulator device, and state of charge evaluation apparatus and method for accumulator

This invention reduces degradation of respective lead storage batteries making up a lead storage battery bank and extends the longevity of the lead storage batteries. A lead storage battery system includes an individual battery state measurement unitthat measures current, voltage, temperature etc. of individual lead storage batteriesor lead storage battery modulesmaking up a lead storage battery bank, a state-of-charge model storage unitthat accumulates state-of-charge models representing a correlation between the battery states and a state of charge, a state-of-charge estimation unitthat estimates individual states of charge of the respective lead storage batteriesor lead storage battery modulesfrom the state-of-charge models and the battery states, a state-of-charge variation range determination unitthat calculates a state-of-charge maximum value and a state-of-charge minimum value, and an equalization-charging management unitthat controls performance of an equalization charge on the lead storage battery bank. The equalization-charging management unitperforms the equalization charge so that the state-of-charge maximum value falls within a range lower than an overcharge region and the state-of-charge minimum value falls within a range higher than a sulfation region.

Lead storage battery system

While a control method is established which can maximize the lifetime of an storage battery based on a SOC capable of maximizing the lifetime of the storage battery under a temperature condition and a wind condition at an electricity generation site and on currently known ones of other operational conditions, a control system is constructed which can feedback to an actual wind power generation and storage battery system. The control system includes a wind power generation and storage battery system, an storage battery operation and deterioration data collection unit for collecting data of the wind power generation and storage battery system, an storage battery operation and deterioration relation assessment unit for assessing a relation between an operation of the storage battery and deterioration thereof based on the collected data, an storage battery operation planning unit for planning such a method of operating the storage battery as to satisfy a necessary lifetime requirement using information obtained by the storage battery operation and deterioration relation assessment unit, and an storage battery operation instruction unit for instructing the wind power generation and storage battery system to operate the storage battery in accordance with the plan of the storage battery operation planning unit.

System for control of wind power generation storage battery and method of control thereof

The life of a lead acid storage battery is extended by changing an over-frequency equalized charge interval performed on a lead acid storage battery, in accordance with a transition situation of a state of charge (SOC) of the lead acid storage battery. The lead acid storage battery is also made to be advantageous in terms of cost by reducing the equalized charge with a low degree of urgency to reduce the power and cost for equalized charge, and by reducing the number of stops of a natural energy storage system. A lead acid storage battery and a lead acid storage battery system whose operational management can be easily performed are achieved by a method in which the future timing when the equalized charge is performed can be grasped by people operating the lead acid storage battery.

Lead acid storage battery and lead acid storage battery system for natural energy utilization system

Growing community of inventors

Nabari, Japan

Hisaaki Takabayashi