Matsushita Electric Industrial Co., Ltd.

Mamoru Iida

Yoshio Moriwaki

Saburo Nakatsuka

Takabumi Fujii

Kikuo Senoo

Hiroshi Yoshizawa

Isao Matsumoto

Takashi Takeuchi

Takuya Nakashima

Hideaki Yoshio

Kazunori Haraguchi

Seiichi Mizutani

Masahiko Ogawa

Yoshio Goda

Akira Iwase

Susumu Kitaoka

Shinji Tsurutani

Takeo Takayanagi

Yoshitaka Matsumasa

Kenji Mizuno

Ichiro Yasuoka

In a first process, an electrically conductive thin metal plate is subjected to a press molding process employing a plurality of punches in a primary molding block and a plurality of dies in a secondary molding block , so as to form therein a plurality of hollow projections that project from one side of the metal plate , and bulges that bulge out in a direction opposite to that of the projections , positioned between the projections . In a second process, the metal plate on which have been formed the plurality of projections and bulges is subjected to either chemical etching or electrolytic etching, so as to form through holes by corrosively removing thin-walled portions from the tips of the projections , and, at the same time, to corrosively form innumerable fine irregularities over the entire surface of the metal plate

Battery cell electrode core plate, fabrication method therefor, and battery cell made therewith

A metal reinforcing plate is welded in place close to the opening on the inside of the battery case, and a plastic insulation gasket and a sealing member provided with an anti-explosion mechanism or the like are sequentially mounted on the metal reinforcing plate. By this arrangement, higher battery capacity can be realized by eliminating the waste of space because it is unnecessary to form a conventional indentation around the upper wall of a battery case. A sealed battery construction having an anti-explosion mechanism and being highly reliable in terms of leakage prevention can be thereby obtained.

Sealed battery and method for manufacturing same

A battery accommodates elements for electromotive-force within a metal case. This metal case is a metal case having a bottom wherein the bottom thickness/side thickness ratio has a value of 1.2-4.0 and has a cylindrical, prismatic or similar shape. The metal case is constructed of a metal material whose chief constituent is aluminum. Furthermore, it is desirable that a multiplicity of shallow grooves perpendicular to a bottom face are formed in at least a battery inside face of the metal case and moreover that a nickel layer is provided on the battery inside face. The metal case is made by DI processing involving drawing and ironing, to have a value of bottom thickness/side thickness ratio which was hitherto unavailable,i.e., 1.2-4.0 can be obtained.

Battery and method of manufacturing therefor

The present invention relates to a construction of an explosion-proof safety vent for small-size non-aqueous electrolyte batteries such as prismatic lithium-ion secondary batteries or with an oval cross section hence with a small area of seal plate, and to a method of producing a seal plate. It aims at securing safety of a battery by allowing an explosion-proof vent to operate without fail with a simple construction at no sacrifice of the capacity. In order to fulfill this aim, it provides an explosion-proof safety vent wherein upper peripheral edge of an opening of a bottomed cell container made of metal and the periphery of a seal plate made of metal are hermetically sealed by laser welding, a rivet serving as a terminal is inserted in a through hole provided on the central portion of the seal plate and hermetically fixed by crimping via a gasket, an exhaust hole is provided between the terminal and the periphery of the seal plate, and the exhaust hole is closed by a metal foil. With such a simple structure, it allows the vent to operate without fail to prevent accident and also proposes a method of continuously producing seal plates in the form of a hoop.

Method of production of non-aqueous electrolyte battery and seal plate

To present a processing apparatus capable of forming an annular support portion for mounting a sealing plate on an elliptical battery case can at high precision and high productivity, and a structure of an elliptical battery using an elliptical battery case can. An elliptical battery case can 10 is rotatably held by a case can support mechanism 13. The battery case can 10 is rotated about its tubular center by a case can rotary mechanism 18. Two groove forming rollers 23, 24 are mounted on an oscillatable roller support lever 28. The roller support lever 28 traces the shape of the outer circumference of the battery case can 10, and oscillates within a plane orthogonal to the tubular center of the battery case can 10, and receives a pressing force from a pressurizing device 29 to press the both groove forming rollers 23, 24 against the outer circumference of the battery case can 10. As a result, an annular groove 50 is formed in the outer circumference of the elliptical battery case can 10, and an annular support portion 40 is formed in the inner circumference.

Apparatus for processing battery case can, a battery, and a

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Kadoma, Japan

Mamoru Iida