Shin-kobe Electric Machinery Co., Ltd.

Hitachi Chemical Company, Ltd.

Ichiro Shimoura

Shinichi Sano

Yoshikazu Hirose

Keiko Abe

Hiroyuki Wakatabe

Katsura Mitani

Hisaaki Takabayashi

Masahiro Watanabe

Keizo Yamada

Hideki Inoue

Kenichi Maeda

Toshiyuki Sawa

Tokiyoshi Hirasawa

Satoshi Minoura

Yasuhiro Kobayashi

Yoshinari Morimoto

Keisuke Fukuhara

Tetsuro Ookoshi

Yoshihisa Okuda

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

A grid plate for a lead acid storage battery including a frame section having a pair of quadrangular contour shape, and longitudinal and lateral grid strands forming a frame section grid. The longitudinal and lateral grid strands have thick strands of smaller thickness than the frame section, and thin strands of smaller width and thickness than the thick strands. Strands adjacent to the thick strands are thin strands, and space allows flow of active material to sides of the thick strands. Ends of the thick strands in the thickness direction are positioned further inward from end faces of the frame section in the thickness direction, and the end portions of one end side of the thin strands in the thickness direction are positioned offset to one end side of the thick strands in the thickness direction, and active material is packed into the reverse surface side of the grid plate.

Grid plate for lead acid storage battery, plate, and lead acid storage battery provided with same plate

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

There is provided a method for operating a lead acid storage battery in order to compensate for fluctuations in the amount of power generated by a solar power generation apparatus, a wind power generation apparatus, or another natural energy power generation device, the lead acid storage battery being charged by a power generation device and discharged to a load. The state of charge of the lead acid storage battery is maintained in a range of 30 to 90% where the fully charged state of the lead acid storage battery is 100%; and the lead acid storage battery is charged and discharged while the battery voltage is kept in a specified range of 1.80 to 2.42 V per cell to extend the service life of the battery. A reference temperature of 25&#xb0; C. is established, and when the ambient temperature has risen above or fallen below the reference temperature, the upper and lower limit values of a specified range are corrected within a range of &#x2212;4 mV/&#xb0; C. to &#x2212;6 mV/&#xb0; C. per cell according to the amount by which the temperature has increased or decreased so that a corrected voltage range is obtained. The storage battery is charged and discharged while the battery voltage is kept in the corrected voltage range, and the battery is operated.

A power system where energy generated at a deceleration time of a running vehicle such as an automobile can be accepted as regenerative energy sufficiently and safely is provided. In a power system a non-aqueous solution system secondary battery group where 10 to 11 lithium ion secondary battery cells are connected in series and an aqueous solution system secondary battery group where control valve type lead-acid battery cells are connected in series are connected in parallel. The battery capacity of the non-aqueous solution system secondary battery group is smaller than that of the aqueous solution system secondary battery group The non-aqueous solution system secondary battery group and the aqueous solution system secondary battery group are charged at a current value of C or less from a motor generator and the ratio of the charged current value of the aqueous solution system secondary battery group to the charged current value of the non-aqueous solution system secondary battery group is 0.05 to 1.00.

Power supply system and state of charge estimating method

Growing community of inventors

Tokyo, Japan

Ichiro Shimoura