Sony Corporation

Norio Mamada

Hiroyuki Yamada

Kazuhito Hatta

Kazuo Honda

Tsuyoshi Sugiyama

Takeru Yamamoto

Takayuki Yamahira

Yoshiaki Takeuchi

Masato Sato

Takaaki Kimijima

Koji Sakai

Provided is a battery which can reduce expansion caused by gas emission when stored at high temperature. A secondary battery () is constructed such that a flat wound electrode () as a power generating element is sandwiched between exterior members (), having adhesion layers () interposed therebetween. The adhesion layers () are, for example, two-sided adhesive tapes and have a structure such that adhesive layers are formed on both surfaces of a thin plate-shaped support layer. The support layer is preferably made of polypropylene or polyimide. The adhesion layers () are composed of maleated polypropylene whose melting point is preferably in a range from 100&#xb0; C. to 200&#xb0; C., more preferably, in a range from 140&#xb0; C. to 180&#xb0; C.

Electric cell

A battery pack is provided. The battery pack includes: a generator device having a battery element disposed on a flexible covering material folded to cover the battery element, wherein three sides of the flexible covering material around the battery element are sealed; a rigid covering material for covering the generator device, having an opening and being bonded to the flexible covering material of the generator device; and a cover fitted into the opening of the rigid covering material, wherein the rigid covering material has a three-layer structure having an outer packaging layer, a metal layer, and a heat-bonding layer which are stacked on one another, and the heat-bonding layer is one selected from an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethyl acrylate copolymer, a methyl acrylate copolymer, a methacrylic acid copolymer, a methyl methacrylate copolymer, polyacrylonitrile, an ethylene vinyl alcohol resin, a polyamide resin, a polyester resin, acid-modified polypropylene, or an ionomer.

Battery pack

A method for producing an active anode substance includes: a step for preparing, with mesophase carbon as a starting material, two carbon materials different in calcination temperature; a step for combining the two carbon materials at a specified ratio, turning the mixture into particles, and molding them into a shaped body; and a step for sintering the shaped body in an atmosphere of an inert gas or in a vacuum into a sintered anode body.

Anode material, method for producing it and nonaqueous electrolyte cell employing such anode materials

Growing community of inventors

Fukushima, Japan

Norio Mamada