Matsushita Electric Industrial Co., Ltd.

Yoshio Goda

Hiroyuki Kobayashi

Saburo Nakatsuka

Masahiko Ogawa

Akira Inanobe

Yoshio Moriwaki

Ryuichiro Ebi

Akihiro Maeda

Tomomichi Ueda

Toru Inagaki

Takeo Takayanagi

Mamoru Iida

Tadahiro Tokumoto

Mashiro Tanaka

Masanori Makino

Masahiro Tanaka

The battery electrode plate includes a core member () which is densely coated with a mixture paste chiefly including an active material (). The core member () is made of a metal sheet (), which is formed with rows () of first and second bowed portions () arranged along one direction (X) of the metal sheet so as to protrude alternately on the front and back sides of the metal sheet, the rows () of bowed portions arranged along the direction (Y) orthogonal to the direction (X) with flat parts () of a predetermined width interposed between each two rows. The battery electrode plate is produced by any of a reciprocating type continuous press method, a rotary type molding method, and an electrolytic deposition method.

Electrode plate for cell and method for manufacturing the same

A battery case () has a cutting groove () formed on its elongated side surface (). Between a groove bottom surface of the cutting groove () and an inner surface of the battery case () is provided a thin-walled easily-rupturable portion () designed to rupture at an instant when an internal pressure of the battery case () reaches a predetermined value. Thereby, a safety mechanism for use with a prismatic battery is realized. The manufacture of the safety mechanism is as follows. A cutting blade () rotated at a high speed by a high-speed rotary body () is brought into cutting engagement with the elongated side surface () of the battery case () of the prismatic battery in finished form until it reaches a predetermined depth and is fixed, and subsequently the high-speed rotary body () or the prismatic battery is brought into rectilinear relative movement.

Safety mechanism for rectangular battery and method of manufacturing the same

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

An apparatus and method for producing expanded mesh sheets provides for forming fine slits in a metal sheet at a slit section by plate cutters, but excluding portions in a center and both sides in a widthwise direction of the metal sheet. The areas where the slits have been formed are drawn out at an expanding section thereby opening the slits and obtaining a mesh sheet which has solid portions in the central portion and on both sides. The mesh sheet is flattened at a rolling device to obtain the expanded mesh sheet. An electrode sheet is prepared by applying an active material onto mesh portions of the expanded mesh sheet, and collectors for a battery are cut out from the electrode sheet such that lead connecting portions thereof are located at the solid portion of the mesh sheet where there are no openings.

Method and apparatus for manufacturing expanded mesh sheet and battery using this expanded mesh sheet

A method for manufacturing an expanded mesh sheet, includes the steps of: forming a plurality of slits on a strip at predetermined pitches to simultaneously form a plurality of strip-shaped lift portions and connecting portions for connecting the strip-shaped lift portions to each other in a lattice pattern, the slits each being intermittently formed in a longitudinal direction of the strip and the adjacent slits in a widthwise direction of the strip being shifted to each other in the longitudinal direction of the strip; and expanding the strip in the widthwise direction thereof. An apparatus for manufacturing the sheet, includes: a pair of rolls engaged to each other, each roll having a plurality of disk-shaped cutters; and a driving device for driving the rolls for rotation. Each cutter has a cutting edge portion and a relief on a periphery thereof at predetermined pitches to form slits, each of which extends in a longitudinal direction of the strip, on the strip by the cutting edge portions of the cutters of the rolls to form strip-shaped lift portions and to form a connecting portion for connecting the strip-shaped lift portions to each other on a position between the slits on an extending direction of the slits by the reliefs of the cutters of the rolls.

Method for manufacturing expanded mesh sheet

A method for manufacturing an expanded mesh sheet, includes the steps of: forming a plurality of slits on a strip at predetermined pitches to simultaneously form a plurality of strip-shaped lift portions and connecting portions connecting the strip-shaped lift portions to each other in a lattice pattern, the slits each being intermittently formed in a longitudinal direction of the strip and the intermittent pattern of adjacent slits in a widthwise direction of the strip being offset from each other in the longitudinal direction of the strip; and expanding the strip in the widthwise direction thereof. An apparatus for manufacturing the sheet, includes: a pair of rolls in coacting meshing engagement with each other, each roll having a plurality of disk-shaped cutters; and a driving device for rotating the rolls. Each cutter has cutting edge portions and reliefs on a periphery thereof at predetermined pitches. The cutting edge portions of the cutters of the rolls form slits defining strip-shaped lift portions while the reliefs leave the connecting portions connecting the strip-shaped lift portions to each other.

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Yao, Japan

Yoshio Goda