Sanyo Electric Co., Ltd.

Yoshikumi Miyamoto

Ryuji Ohshita

Yoshinobu Okumura

Hitoshi Tanaka

Jun Okazaki

Masatoshi Takahashi

Eiji Okutani

Tomokazu Yamanaka

Takuya Sunagawa

Toshirou Yanagawa

Tadatoshi Fukuta

Atsushi Obayashi

Ryuji Oshita

Provided is a sealed battery that can offer excellent battery performances by having its electrode terminal and a current collector securely welded to each other, and its manufacturing method. The sealed battery is formed by hermetically sealing a casing storing an electrode assembly and the current collector, wherein: the electrode assembly formed by layering positive and negative electrode plates with a separator sandwiched therebetween is electrically connected to the current collector; and a shaft portion of the electrode terminal penetrates through the current collector. A part of the electrode terminal projecting out from a pass-through of the current collector is a (conical) frustum-shaped portion whose bottom base is in contact with the current collector. The frustum-shaped portion is pressed against the current collector, and the frustum-shaped portion and the current collector are welded together in at least one area on a perimeter of the bottom base of the frustum-shaped portion.

Sealed battery with electrode terminal welded to current collector, and manufacturing method for the same

To provide a non-aqueous electrolyte secondary battery adapted to prevent an internal short circuit between an positive electrode and a negative electrode caused by the penetration of electrically conductive micro particles through a separator, which occurs when winding up electrodes, and manufacturing methods of an electrode used therein, whereby the non-aqueous electrolyte secondary battery having a coiled electrode assembly is formed through the multilayer winding of an positive electrodehaving a metallic collectorcoated with an positive electrode mixturecomposed of an positive electrode active material that occludes and liberates lithium ions, a negative electrodehaving a metallic collectorcoated with a negative electrode mixture, composed of a negative electrode active material that occludes and liberates lithium ions, and a separatorinterposed between the positive electrode and the negative electrode, wherein the positive electrodehas an insulating layerformed by means of the dried coating method, the heat seal tape method, or the hot melt coating method on a portion of the metallic collectorwhich is uncoated with the positive electrode mixtureand opposed to the negative electrodecoated with the negative electrode mixture, through the separator

Non-aqueous electrolyte secondary battery and manufacturing methods of an electrode used therein

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

A lithium secondary battery having improved load characteristics such as high rate discharge properties is obtained by using a mixed cathode active material comprising a mixture of lithium-containing manganese oxide having a spinel type crystal structure and lithium-containing cobalt oxide, wherein the cathode collector retains mixed cathode active material in such a manner that the mixing ratio of lithium cobaltate X thereof should fall in a range of 0.1&lE;X&lE;0.9, that the bulk density Y (g/cm ) of the cathode mixed agent should be confined in a range satisfying the relation of 0.5X&plus;2.7&lE;Y&lE;0.6X&plus;3.3, and that the mean particle diameter of spinel type lithium manganate should be greater than the mean particle diameter of lithium cobaltate.

Mixed cathode active material for lithium secondary battery

Growing community of inventors

Kyoto, Japan

Yoshikumi Miyamoto