Sanyo Electric Co., Ltd.

Toshirou Yanagawa

Ryuji Ohshita

Yoshinobu Okumura

Takashi Kondou

Yoshikumi Miyamoto

Hitoshi Tanaka

Tatsuya Nagare

Tadatoshi Fukuta

Jun Okazaki

Katsuya Mototani

Hiroto Izui

Yoshinori Yatabe

A method includes the steps of: with the use of a winding core having a first member wherein its cross sectional-area in the direction orthogonal to the revolving axis and the peripheral length of the cross section are larger than those of a second member, passing a strip-shaped separator between the first member and the second member, placing one strip-shaped electrode plate near the second member such that the plate is not in contact with the winding core, and winding for one revolution the one electrode plate and the strip-shaped separator toward the first member; placing another strip-shaped electrode plate between the inner and outer portions of the separator that have been revolved along with the one electrode, winding both electrodes along with the separator toward the first member by revolving the winding core; removing the winding core and pressure-molding the resulting wound article into a flat wound electrode assembly.

Cell having flat wound electrode assembly and method of producing such cell

An electrode plate for a secondary battery is provided for reducing adverse influences caused by paste of an insulating sheet in an electrode body and a battery specification. Active material layerstoand 22' to&#x2032; are formed on at least one surface of an electrode sheetover a wider range than a predetermined width of an electrode and over a predetermined length. An insulating sheetis made to adhere to a possible short-circuit portion of the electrode sheetwhich portion is opposed to another electrode. The electrode sheetand an insulating member are simultaneously cut to form an electrode plate having a predetermined shape, wherein the insulating member has a low-temperature thermoplastic paste material applied on one side thereof, and is made to adhere to the electrode sheetthrough heat adhesion.

Electrode plate for secondary battery, method of manufacturing the same, and secondary battery using the same

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Sumoto, Japan

Toshirou Yanagawa