Sanyo Electric Co., Ltd.

Yoichiro Shibata

Takuya Tamagawa

Chihiro Fujisawa

Etsuya Fujisaka

Kazuki Hamasaki

Katsuya Ito

Makoto Nakagawa

Fumiaki Nakata

The object of the present invention is to provide a reliable alkaline storage battery having a structure by which a short circuit between the electrodes can be prevented in the manufacturing procedures. To achieve this object, the present invention provides a cylindrical battery that includes an electrode assembly including a positive electrode plate and a negative electrode plate spirally wound together and sandwiching a separator. The collector plate includes a main body. One or more convex parts, each having a top extending linearly, are formed on a main surface of the main body by bending processing. A part of at least one of the convex part is cut out to form a cutout region. The collector plate is welded to the end part of the electrode assembly at the top of each convex part.

Battery having a collector plate

A nickel electrode for an alkaline storage battery is made by filling a conductive porous member with an active material including a main active material layer substantially made of nickel hydroxide and containing cobalt in a state of a solid solution, and a compound layer containing at least one element selected from the group consisting of calcium, aluminum, strontium, scandium, yttrium, and lanthanoide series, the compound layer being formed on a surface of the main active material layer. A metal molar ratio of cobalt contained in the main active material layer to nickel contained in the main active material layer is in a range of 0.5% to 3.0%, and a metal molar ratio of the at least one element contained in the compound layer to nickel contained in the active material is in a range of 0.3% to 5.0%.

Nickel electrode for alkaline storage battery and method of manufacturing the same

A method of producing a nickel electrode for an alkaline storage battery, comprising: an active-material loading step comprising preparing an active-material loaded plate electrode by loading an active-material containing nickel hydroxide as its principal component into the pores of said porous electrically conductive substrate; an immersion step comprising immersing said active-material loaded plate electrode into an impregnation solution comprising an acid salt solution containing at least one element selected from the group consisting of Ca, Sr, Sc, Y, Al, Mn, and lanthanides; and an alkali treatment step comprising forming a hydroxide layer on the surface of the electrode plate by converting the acid salt into a hydroxide by immersing said plate electrode into an alkaline solution; provided that the temperature of the impregnation solution is controlled in a range of from 40 to 90&deg; C., and that the pH value of impregnating solution is controlled to a range of from 4 to 6. Thus, it is provided a nickel electrode free from a drop in battery capacity and yet having excellent high temperature characteristics by controlling the amount of elution of the loaded active material even when immersed in an acid salt solution.

Method of producing nickel electrode for alkaline storage batteries

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Awaji, Japan

Yoichiro Shibata