Matsushita Electric Industrial Co., Ltd.

Other

Toyota Jidosha Kabushiki Kaisha

Panasonic Ev Energy Co., Ltd.

Sumitomo Electric Industries, Limited

Panasonic Corporation

Sumitomo Electric Industries, Co.

Nobuyasu Morishita

Munehisa Ikoma

Kiyoshi Hayashi

Shinji Hamada

Hiromu Matsuda

Noriyuki Fujioka

Hiroshi Inoue

Akihiro Taniguchi

Hideo Kaiya

Hiroki Takeshima

Toshifumi Ueda

Keizo Harada

Shosaku Yamanaka

Shinichi Yuasa

Kenichi Watanabe

Kojiro Ito

Yoshinori Toyoguchi

Takuma Iida

Shinichiro Ito

Hajime Seri

Naoto Sato

Yoshiaki Ogata

Yohei Hattori

Katsuyuki Tomioka

Kazuyuki Kusama

Noboru Ito

Kenji Sato

Kazuhiro Ohta

Toshihiro Yamada

Isao Matsumoto

Kohei Suzuki

Katsunori Komori

Kouta Togashi

Masakazu Ikeyama

Kazuhiro Ohkawa

Miho Okamoto

Masaru Kobayashi

Yasuko Hoshina

Atsushi Adachi

Michio Ozawa

Satoshi Uda

Naoto Matsushita Electric Industrial Co Ltd Sato

In a charging/discharging control system for controlling an allowable power level of a secondary battery at the time of charging/discharging operations, excessive discharging or recharging of the secondary battery is prevented, and excessive suppression of the charging/discharging of the secondary battery is prevented. A vehicle ECU controls charging/discharging of the secondary battery in accordance with a predetermined allowable power level. A battery ECU detects an actual loading power level of a secondary battery; calculates a differential power level between the detected actual loading power level and an allowable power level; measures the number of times the calculated differential power level has become equal to or lower than a predetermined threshold value; and downwardly revises the allowable power level when the count has become equal to or greater than a predetermined upper-limit level.

System for controlling charge/discharge of secondary battery, and battery controller

A controller for a rechargeable vehicle battery that prevents drivability from being lowered. The controller includes a voltage measurement unit for measuring terminal voltage of the rechargeable battery and a control unit for setting a plurality of output maximum voltages, each indicating an upper limit for discharge power allowed to be output from the rechargeable battery during a predetermined time. The control unit compares the measured terminal voltage of the rechargeable battery with a plurality of reference voltages respectively corresponding to the plurality of output maximum values. The control unit simultaneously lowers each of the output maximum values or sequentially lowers the output maximum values from the highest one of the output maximum values based on the comparison result.

Device and method for controlling output from a rechargeable battery

In a nickel-metal hydride rechargeable battery comprising a positive electrode of nickel hydroxide and a negative electrode of hydrogen-absorption alloy, prolonged battery life is achieved by limiting the charge and discharge operations to be performed in the range of 20-60% of the hydrogen-absorption capacity of the hydrogen-absorption alloy.

Nickel-metal hydride rechargeable battery

A controller for a rechargeable battery that improves the recovering efficiency of the energy used to charge the rechargeable battery and prevents the life of the rechargeable battery from being shortened by overcharging. The controller includes a voltage measurement unit for measuring terminal voltage of the rechargeable battery and a control unit for setting a plurality of input maximum voltages, each indicating an upper limit for charging power input to the rechargeable battery during a predetermined time. The control unit sets a plurality of reference voltages respectively corresponding to the plurality of input maximum values. When the terminal voltage of the rechargeable battery increases to one of the reference voltages, the control unit lowers the input maximum value corresponding to that reference voltage.

Device and method for controlling input to a rechargeable battery

A plate core material is manufactured by a method including the processes of soaking a core material () that is made of nickel or nickel-plated steel and includes copper as an impurity in an aqueous solution () containing ammonium ions and hydrogen peroxide, so that the copper is dissolved in the aqueous solution (), and removing the aqueous solution () from the surface of the core material (). Further, an alkaline storage battery is manufactured by a method including this manufacturing method. According to the manufacturing method of the present invention, an alkaline storage battery having higher reliability than that of a conventional alkaline storage battery can be obtained.

Method for manufacturing core material for electrode plate and method for manufacturing alkaline storage battery

To provide a method of controlling charge and discharge of a secondary battery for automatic guided vehicle that can decide the timing of refresh charge and discharge accurately and minimize the frequency of refresh charge and discharge. The method of controlling charge and discharge of a secondary battery for automatic guided vehicle comprises a first discharge step of making the secondary battery drive an automatic guided vehicle and discharge electricity with a predetermined amount; a voltage measurement step of measuring a discharge end voltage of the secondary battery at the completion of the first discharge step; and a charge step of performing a first charge step of charging the secondary battery incompletely at a first charging current value when the discharge end voltage is higher than a preset minimum voltage, and performing a second charge step of discharging the secondary battery fully and then charging the secondary battery fully at a second charging current value smaller than the first charging current value when the discharge end voltage equals the preset minimum voltage or less.

Method of controlling charge and discharge of secondary battery for automatic guided vehicle

A group of electrodes are accommodated in a prismatic cell case of a rechargeable battery. Intervening separators are provided between positive and negative electrode plates arranged alternately in parallel to long lateral walls of the cell case. The positive electrode plates each include a lead portion having a surface on which at least one lead plate is attached. Lateral edges of the positive electrode plates protrude beyond the negative electrode plates on one side, and lateral edges of the negative electrode plates protrude beyond the group of positive electrode plates on the opposite side. The protruding portions form the lead portions. Upper open ends of the cell cases are closed by an integral lid member.

Battery module, and rechargeable battery for constituting the battery module

To provide an alkaline storage battery, a cobalt compound obtained by mixing a cobalt hydroxide powder and a sodium hydroxide powder and applying a heat treatment to the same in an atmosphere containing oxygen, a cobalt compound obtained by adding a sodium hydroxide aqueous solution and an aqueous solution containing an oxidizing agent to a cobalt hydroxide powder, or a cobalt compound obtained by baking a cobalt hydroxide powder in an atmosphere containing oxygen is used. This provides cobalt compounds suitable for producing long-life and highly reliable alkaline storage batteries, methods for manufacturing the same, and positive electrode plates of alkaline storage batteries employing the same.

Cobalt compound for use in alkaline storage battery, method for manufacturing the same, and positive electrode plate of alkaline storage battery employing 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

An alkaline storage battery includes a positive electrode, a negative electrode, a separator, and an alkaline electrolyte retained in the positive electrode, the negative electrode, and the separator. The alkaline storage battery further includes a first compound for adsorbing ammonia between the positive electrode and the negative electrode. The positive electrode comprises a second compound for increasing oxygen overvoltage at a time of overcharge. Thus, an alkaline storage battery with particularly little self-discharge can be provided.

Alkaline storage battery

An electrode plate for an alkaline storage battery of the present invention includes a conductive core material as a current collector, in which a plurality of through-holes are linearly provided in the core material so as to be parallel to a longitudinal direction of the core material, each through-hole having an aperture area of 10 mmor less and at least two pairs of opposite sides parallel to each other.

Electrode plate for alkaline storage battery and alkaline storage battery using the same

A separator for an alkaline storage battery includes a plurality of polyolefin resins. The polyolefin resins include a first polyolefin resin that is sulfonated, and a second polyolefin resin that is sulfonated. The degree of sulfonation of the first polyolefin resin is different from that of the second polyolefin resin. Thus, a novel separator having high liquid retention properties and high air permeability, and an alkaline storage battery using the same can be obtained.

Separator for alkaline storage battery and alkaline storage battery using the same

An alkaline rechargeable battery, having an electrode plate group including positive electrode plates and negative electrode plates stacked alternately with separators interposed therebetween, arranged in such a manner that a volume of the separators before the initial charge and discharge accounts for 30 to 60% of a volume of the electrode plate group.

Alkaline rechargeable battery

In each of the cells that constitute an battery module, a plurality of positive electrode plates and negative electrode plates are layered parallel to the long lateral walls of prismatic cell cases with intervening separators therebetween, wherein lateral edge portions of the positive electrode plates protrude beyond the negative electrode plates on one side, and lateral edge portions of the negative electrode plates protrude beyond the group of positive electrode plates on the opposite side, the protruding portions forming lead portions.

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.

Growing community of inventors

Toyohashi, Japan

Nobuyasu Morishita