Hitachi Maxell, Limited

Hayato Higuchi

Fusaji Kita

Hideo Sakata

Yoshiki Somatomo

Naoto Sugimune

Kazunobu Matsumoto

Koji Murakami

Minako Iwasaki

Tohsiya Takaishi

Hiroki Ishikawa

A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode and a negative electrode laminated with a separator interposed between them, and a nonaqueous electrolyte, wherein said negative electrode comprises graphite as a negative electrode active material, and has a coating density of at least 1.70 g/cm, pore diameter of the maximum of less than 0.5 &#x3bc;m, and the logarithmic value of differential intrusion of at least 0.14 cm/g at the pore diameter of the maximum.

Nonaqueous secondary battery and electronic equipment using the same

A battery provided with one end of each lead element connected to the positive and negative electrode respectively is drawn out from the can bodythrough a spaceformed at a surface part of said jointed flange sectionand the area of the flange section around the drawing space is sealed by a resin bonding. The battery provided with a new structure which can solve the problems which may be generated in all fields, such as battery shape, attachment property, battery strength, productivity and so on in order to make a thin type battery.

Battery used for small electric devices

A non-aqueous secondary cell comprising a wound structure, in which a positive electrode having a positive collector carrying positive active material on both sides at least at a part of the collector and a negative electrode having a negative collector carrying a negative active material on both sides at least at a part of the collector are wound with inserting a separator inbetween, and a cell can for holding said electrodes, in which the electrode, which faces the can, consists of either electrode material, the outer side of the positive collector at least in the outermost part of the positive electrode has no coating film containing a positive active material, said outer most part of the positive collector faces the negative electrode or the inner wall of the cell can through the separator, and a lead member which is welded to the negative collector does not directly face the positive electrode through the separator.

Non-aqueous secondary cell

Growing community of inventors

Ibaraki, Japan

Hayato Higuchi