Other

Toyota Jidosha Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Shinichi Yuasa

Nobuyasu Morishita

Shinichiro Ito

Kojiro Ito

Shinji Hamada

Munehisa Ikoma

Hajime Seri

Mitsugu Takaki

Hiroyuki Sakamoto

Shinsuke Fukuda

Toyohiko Eto

Seiji Yamaguchi

Akihiro Taniguchi

Takashi Asahina

Tomokazu Sada

Kiyoshi Hayashi

Keisuke Naito

Yoshito Kaga

Kazuhiro Ohkawa

Toshihiro Yamada

Hiroshi Tenmyo

Hiroshi Fujikawa

In a battery system, a battery module includes a plurality of cells. A management unit manages charging-discharging of the battery module and a temperature inside the battery module. The management unit estimates a maximum temperature of an inside of a cell in the battery module based on a measured temperature in the battery module, and controls, during charging-discharging of the battery module, a charging-discharging current of the battery module and/or cooling of the battery module in such a way that the estimated maximum temperature does not exceed an upper limit temperature.

Battery system

A voltage detection unit detects voltage between both ends of a power storage unit. A current detection unit detects current flowing through the power storage unit. A control unit estimates a state of charge (SOC) of the power storage unit using an open circuit voltage (OCV) method based on the voltage detected by the voltage detection unit and estimates the SOC of the power storage unit using a current integration method based on the current detected by the current detection unit. The control unit compares the SOC estimated using the OCV method with the SOC estimated using the current integration method to determine whether micro short circuit occurs in the power storage unit.

Management apparatus and power storage system

There are provided a positive electrode active material for an alkaline storage battery, a positive electrode for an alkaline storage battery, and an alkaline storage battery each of which has an excellent output characteristics and also has an excellent self-discharge characteristic and an excellent cycle lifetime characteristic. The positive electrode active material for an alkaline storage battery according to the present invention has nickel hydroxide particles each containing at least magnesium in a solid solution state and a cobalt compound layer coating the surface of each of the nickel hydroxide particles. Among them, the cobalt compound layer contains cobalt having an average valence of not less than 2.6 and not more than 3.0 and also contains sodium at a proportion of less than 0.10 wt % to the total weight of the cobalt compound layer. The positive electrode active material for an alkaline storage battery according to the present invention has a conductivity smaller than 1.0&#xd7;10S/cm in a state pressurized at 39.2 MPa.

Positive electrode active material for alkaline storage battery, positive electrode for alkaline storage battery, alkaline storage battery, and method for manufacturing positive electrode active material for alkaline storage battery

A method of manufacturing a hydrogen-absorption alloy electrode which comprises particles of a hydrogen-absorption alloy that comprises a rare earth element, Ni, Co and Al. The method comprises subjecting the hydrogen-absorption alloy particles to an alkaline treatment in a 10 to 50 weight % NaOH solution at 60 to 140&#xb0; C. for 0.5 to 5 hours such that on the surface of the particles (amount of Al on surface/amount of Al in alloy)&#x3c;(amount of Co on surface/amount of Co in alloy).

Hydrogen-absorption alloy electrode

A hydrogen absorbing alloy powder includes an intermetallic compound having an ABtype crystal structure and containing La for an A site element and Ni for a B site element. The powder contains La by 20 wt % or more and metallic Ni by from 2.0 wt % to 10 wt %, and acicular or grain shape precipitates containing La(OH)are deposited on a surface thereof. The powder has an intensity ratio P/Psatisfying a relation: P/P&#x2267;0.02, where Pis a peak intensity appearing in the vicinity of: diffraction angle 2&#x3b8;=42.5 deg and showing (111) face of LaNiand Pis a peak intensity appearing in the vicinity of: diffraction angle 2&#x3b8;=15.8 deg and showing (100) face of La(OH)in the X-ray diffractometry using CuK&#x3b1; rays.

Hydrogen absorbing alloy powder and nickel-metal hydride battery using the same

A sealed battery includes a metal case which functions as a connection terminal of one polarity and an electrode post which is mounted to the case in an insulated manner and functions as a connection terminal of the other polarity. A sealing section with electrical insulation properties is disposed between the electrode post formed from a hollow cylinder with one closed end and an electrode post through-hole provided in the case. A compression deformation section is produced by deforming the closed end of the electrode post radially outward, for compressing and sealing the sealing section, and for securing the electrode post to the case.

Sealed battery and method for manufacturing the same

A negative electrode of a battery, chiefly includes hydrogen absorption alloy particles each having a surface layer. The alloy particles satisfy R/R&#x2267;0.004 and 5 &#x3bc;m&#x2266;R&#x2266;20 &#x3bc;m, or preferably 5 &#x3bc;m&#x2266;R&#x2266;12.5 &#x3bc;m, where Ris a half of a median diameter of the particles and Ris thickness of the surface layers.

Hydrogen absorption alloy electrode

A negative electrode of a battery, chiefly includes hydrogen absorption alloy particles each having a surface layer. The alloy particles satisfy R /R &gE;0.004 and 5 &mgr;m&lE;R &lE;20 &mgr;m, or preferably 5 &mgr;m&lE;R &lE;12.5 &mgr;m, where R is a half of a median diameter of the particles and R is thickness of the surface layers.

A square shaped battery includes: an electrode plate group including a belt-like positive electrode plate, a belt-like negative electrode plate, and a belt-like separator, the belt-like positive electrode plate, the belt-like negative electrode plate, and the belt-like separator being laminated and rolled up to form the electrode plate group; and a pair of power collectors disposed on sides of the electrode plate group for collecting electric power from the electrode plate group.

Square shaped battery

A positive electrode for an alkaline storage battery having a high capacity and facilitating the manufacturing thereof and an alkaline storage battery using the same are provided. The positive electrode utilized includes active material powder containing nickel hydroxide and powder made of cobalt compounds, where a ratio of a cobalt compound with a valence of cobalt being 2.6 or more to the whole of cobalt compounds is 30 weight % or more.

Positive electrode for alkaline storage battery and alkaline storage battery using the same

A charge control apparatus for a battery pack having a cooling structure includes: a refrigerant temperature sensor for detecting a refrigerant temperature of a refrigerant which cools the battery pack; a battery temperature sensor for detecting a battery temperature of the battery pack; an ambient temperature sensor for detecting an ambient temperature of the battery pack; and a control section for controlling the charge of the battery pack, based on the refrigerant temperature detected by the refrigerant temperature sensor, the battery temperature detected by the battery temperature sensor and the ambient temperature detected by the ambient temperature sensor.

Charge control apparatus for controlling a charge of a battery pack based upon refrigerant temperature, battery temperature and ambient temperature

In an integrated sealed secondary battery in which a plurality of cells are arranged in a row, cooling medium passages are formed on both sides of the row of the cells and cooling medium passages are formed between adjacent cells such as to effect communication between the cooling medium passages on both sides. The cross-sectional areas of the cooling medium passages on both sides are made different so as to generate pressure difference at both ends of the cooling medium passages between the cases. The cooling medium passages on both sides are formed in a meandering manner by the provision of projection strips that extend alternately downwards from the top wall and upwards from the bottom wall of the cooling medium passages

Integrated sealed secondary battery

An integrated sealed secondary battery in which a plurality of cells are arranged in a row, cooling medium passages are formed on both sides on the row of the cell, and cooling medium passages are formed between adjacent cells such as to effect communication between the cooling medium passages on both sides.

Disclosed is a hydrogen storage alloy electrode for use in alkaline storage batteries that can reduce internal resistance of the battery and can give an excellent output characteristic and a long cycle life to the battery. The electrode comprises an AB,-type hydrogen storage alloy powder, a yttrium compound and a compound of a light rare earth element. The total content of the yttrium compound and the compound of a light rare earth element is in a range of 0.5 to 2.0 parts by weight per 100 parts by weight of hydrogen storage alloy powder. Preferable ratios of the yttrium compound and the compound of a light rare earth element selected from La, Ce, Pr and Nd are, respectively, 60 wt % or more and 7 wt % or less in the total amount of the yttrium compound and the compound of the light rare earth element.

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Kyotanabe, Japan

Shinichi Yuasa