Sanyo Electric Co., Ltd.

Agency of Industrial Science and Technology

Ikuo Yonezu

Koji Nishio

Shin Fujitani

Toshiyuki Nohma

Yoshinori Matsuura

Naoya Nakanishi

Katsuhiko Shinyama

Kouichi Satoh

Reizo Maeda

Mitsuzo Nogami

Hiroshi Nakamura

Hiroshi Watanabe

Yoshito Chikano

Takahiro Yonesaki

Teruhiko Imoto

Toshihiko Saito

Koichi Nishimura

Mitsuzou Nogami

Akio Furukawa

Yumiko Nakamura

Mamoru Kimoto

Katsunori Yanagida

Nobuyuki Higashiyama

Atsushi Yanai

Atsuhiro Funahashi

Tadayoshi Tanaka

Takeshi Maeda

Kenji Nasako

Kazunari Ohkita

Takahiro Isono

Yasuyuki Harada

Kazuyasu Fujiwara

Kouichi Nishimura

Mutsumi Yano

Yoshinori Kida

Mitsunori Tokuda

Takaaki Matsubayashi

Hideyuki Inomata

Naojiro Honda

Masahisa Fujimoto

Yasuo Miyake

Masao Inoue

Ryuji Ohshita

Hisaki Tarui

Yoichi Domoto

Nobuhiro Furukawa

Takashi Yasuo

Naoki Hiro

Nobuyoshi Nishizawa

Masaru Tsutsumi

Koichi Sato

Yasushi Kuroda

Hiroyuki Akita

Takashi Sakai

Kouichi Satou

Kazunari Ookita

Shigeru Sakamoto

Koichi Satoh

Tsukasa Itoh

Maruo Kamino

Hiromasa Yagi

Kikuko Kato

Yasunori Yoshimoto

Yoshifumi Magari

Hiroaki Ikeda

Tadashi Ise

Yasuhiko Itoh

Noriyuki Tamura

Toshikazu Yoshida

Mitsuo Karakane

Takuya Sunagawa

Yukinori Akiyama

Toshihiko Saitoh

Hiroshi Fukuda

Takuya Hashimoto

Fusago Mizutaki

Kousuke Satoguchi

Syuichi Suzuki

Kiyoshi Hori

Syuuichi Suzuki

Haruyuki Inui

Masaharu Yamaguchi

Masakazu Moroto

Takehiro Yonesaki

Koji Akashi

Maki Kamikawa

Noboru Nakano

A secondary cell comprises an electrode unit housed in a cell can comprising a cylinder having a bottom and a closed opening, and a current collector plateis provided at one end of the electrode unit. The current collector platehas a plurality of protrusionsextending radially thereof and joined to an edge of the electrode unit. The surface of the current collector plateto be joined to the bottom wall of the cylinder has a flat region R extending on a predetermined closed-loop track on the surface, and the portions of the current collector plateand the cylinder to be joined are subjected along the flat region R to laser welding from outside the cylinder.

Secondary cell

A nickel electrode for an alkaline storage battery in which an active material mainly containing nickel hydroxide is applied to a porous sintered nickel substrate, wherein a layer containing at least one hydroxide of an element selected from a group consisting of Ca, Sr, Sc, Y, lanthanoid, and Bi is formed on a surface of the active material thus applied to the sintered nickel substrate, or between the sintered nickel substrate and the active material.

Nickel electrode for alkaline storage battery, method of producing nickel electrode for alkaline storage battery, and alkaline storage battery

Nickel electrode for alkali storage battery, method of producing nickel electrode for alkali storage battery, and alkali storage battery

A separator for a nickel-metal hydride storage battery having a hydrogen-absorbing alloy as a negative electrode. The separator is a laminate of a substrate and a porous hydrophilic film.

Separator for nickel-metal hydride storage battery and nickel-metal hydride storage battery

A nonaqueous electrolyte secondary cell comprises a rolled-up electrode unitcomposed of a positive electrode, a negative electrodeand a separatorinterposed therebetween, and a negative electrode current collector plateand a positive electrode current collector platejoined to the respective ends of the electrode unit. The negative electrode collector plateis joined to an edge of the negative electrodeprojecting at one of the opposite ends of the electrode unit. The collector platehas a two-layer structure comprising a copper layermade of copper or an alloy consisting predominantly of copper, and a metal layer made of a metal not forming an intermetallic compound with lithium and having a lower laser beam reflectivity than copper or an alloy consisting predominantly of the metal. The collector platehas its copper layercontacted with the edge of the negative electrodeand welded thereto with a laser beam. This improves the weldability of the collector plateto the rolled-up electrode unitto achieve a high current collecting efficiency.

Process for fabricating nonaqueous electrolyte secondary cells

A battery module has a plurality of electrically connected unit cells fixed in a container. A buffer member is provided at the void between the inner wall of the container and the unit cell. By virtue of the buffer member in the battery module formed of a heat conductive elastic body, the requirement of vibration resistance can be met by the buffer member while the heat generated by the unit cell can be easily discharged via the buffer member. Thus, a battery module suppressed in degradation of the performance of the unit cell caused by heat can be provided.

Battery module and container for battery module

A method of manufacturing a metal hydride alkaline storage cell includes a first step of preparing a negative electrode by applying a paste containing hydrogen absorbing alloy powder onto a substrate; and a second step of placing the negative electrode and a positive electrode into a cell can with disposing separator therebetween, and thereafter pouring an electrolyte into the cell can. Into the paste or the electrolyte, a catalytic metal compound that has a proportion of 0.1 to 2.5 wt. % based on the weight of the hydrogen-absorbing alloy powder and that is soluble in the electrolyte is added. Consequently, the catalytic action of the metal is fully utilized by this method that dots a catalytic metal or metal compound on the alloy surface, and thereby the inner pressure characteristic (high-rate charge characteristic) of a cell is improved.

Manufacturing method of metal hydride alkaline storage cell

Nonaqueous electrolyte secondary cells

For us in nonaqueous electrolyte secondary cells, the invention provides an electrode which comprises a first carbon material serving as a core material, and a second carbon material coating the first carbon material over the surface thereof and containing boron. When used as an active substance for negative electrode to provide a nonaqueous electrolyte secondary cell, the electrode diminishes the reduction of the cell capacity that would result if the cell is allowed to store, giving improved storage characteristics to the cell.

Carbon materials, electrodes and nonaqueous electrolyte secondary cells

A fuel cell separator which has a metal substrate and offers a high corrosion resistance and conductivity is provided. The separator has a metal layer on the surface of the substrate made of stainless steel, and a conductive layer on top of the metal layer. The conductive layer is made up of conductive particles which are fusion-bonded to each other and exhibit excellent conductivity. The separator also has a highly corrosion-resisting oxide layer which covers exposed parts of the metal layer, the parts where the metal layer is not covered with the conductive particles. This enables the fuel cell separator to assume high conductivity at an interface between the metal layer and the conductive particles, and high corrosion resistance at the exposed parts of the surface of the metal layer.

Separator used for fuel cell, method for manufacturing the separator, and the fuel cell

A metal hydride alkaline storage cell of the present invention comprises a positive electrode, a separator impregnated with an electrolyte, and a negative electrode comprising hydrogen-absorbing alloy powder. On the surface of the hydrogen-absorbing alloy powder, there is formed a layer of hydrogen-absorbing alloy oxide, and on the layer of the oxide, there is dotted a catalytic metal or metal compound formed in a granular state by adding a substance soluble in the electrolyte. The substance is selected from the group consisting of a metal fluoride, a metal chloride, a metal iodide, and a metal sulfide. The proportion of the metal fluoride, the metal chloride, the metal iodide, or the metal sulfide in adding, is restricted within the range of from 0.1 to 2.5 wt. % based on the weight of hydrogen-absorbing alloy powder. When the layer of the hydrogen-absorbing alloy oxide is formed on the surface of the hydrogen-absorbing alloy powder, the reaction area on the surface of the hydrogen-absorbing alloy is increased due to the roughness of the layer. Consequently, the catalytic action of the metal is fully utilized by dotting a catalytic metal or metal compound on the alloy surface, and thereby the inner pressure characteristic (high-rate charge characteristic) of a cell is improved.

Metal hydride alkaline storage cell and manufacturing method thereof

Used as the positive electrode active substance of a lithium ion secondary cell is a mixture of a lithium-nickel-cobalt-manganese composite oxide represented by the formula LiNi CO Mn O wherein 0.5<x&plus;y<1.0 and 0.1<y<0.6 and a lithium-manganese composite oxide represented by the formula Li Mn O wherein 0&lE;z&lE;0.2. The substance used gives outstanding power characteristics to the cell.

In an alkaline secondary battery provided with a positive electrode, a negative electrode, a separator to be interposed between the positive electrode and the negative electrode, and an alkaline electrolyte solution, the above-mentioned separator has carbon-carbon double bonds. Further, an average amount of carbon-carbon double bonds in the separator is in the range of 10 &mgr;mol/g to 200 &mgr;mol/g, and an average amount of increased nitrogen in the separator after the separator is immersed in an alkaline aqueous solution having ammonium salt dissolved therein is not less than 140 &mgr;g/g.

Separator for alkaline secondary battery, method for preparing the same alkaline secondary battery

A rechargeable lithium battery using an Li alloying metal as the active material of at least one of its positive and negative electrodes. The metal active material is covered with a thin film which is nonreactive with Li ions, permits passage of Li ions but does not have an Li ion conductivity.

Rechargeable lithium battery

A nonaqueous electrolyte secondary cell includes a rolled-up electrode unit composed of a positive electrode, a negative electrode and a separator interposed therebetween, and a negative electrode current collector plate and a positive electrode current collector plate joined to the respective ends of the electrode unit. The collector plate has a two-layer structure comprising a copper layer made of copper or an alloy consisting predominantly of copper, and a metal layer made of a metal not forming an intermetallic compound with lithium and having a lower laser beam reflectivity than copper or an alloy consisting predominantly of the metal. The collector plate has its copper layer contacted with an edge of the negative electrode projecting at one of the opposite ends of the electrode unit and welded thereto with a laser beam.

Nonaqueous electrolyte secondary cells and process for fabricating same

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Hirakata, Japan

Ikuo Yonezu