ELECTROCHEMICAL CELL WITH FLAT CASTING AND VENT

WIPO Patent Application WO2004015793

A3

An electrochemical cell generating hydrogen gas upon discharge, wherein said cell has an outer casing (89), a vent aperture (70) passing through a wall of said casing, and a rupturable membrane (20) covering said vent aperture. The outer casing (89) preferably has a flat wall running along the cell's length and a vent aperture passing through said flat wall. The cell may typically be an alkaline cell in the shape of a cuboid. The rupturable membrane may be secured by a ring (25) facing the inside surface of said flat wall of the casing in a position adjacent the vent aperture. The rupturable membrane is preferably of polysulfone. The membrane allows hydrogen gas to permeate therethrough to the environment and is rupturable if hydrogen gas within the cell interior builds up rapidly to a threshold pressure level. Optionally, a pointed puncture member (70) extends into the vent aperture. The pointed puncture member causes the membrane to tear at the moment of rupture.

SHELEKHIN ALEXANDER (US)
FERRIN ROBERT S (US)
SYLVESTRE MATTHEW (US)
SPECHT STEVEN J (US)
ROBERTS MICHAEL F (US)
ASHBOLT MARK (US)

PCT/US2003/024468

December 23, 2004

August 05, 2003

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GILLETTE CO (US)
SHELEKHIN ALEXANDER (US)
FERRIN ROBERT S (US)
SYLVESTRE MATTHEW (US)
SPECHT STEVEN J (US)
ROBERTS MICHAEL F (US)
ASHBOLT MARK (US)

H01M6/06; H01M6/12; H01M50/103; H01M4/42; H01M4/50; H01M6/04; (IPC1-7): H01M2/12

US6127062A	2000-10-03
EP0977290A1	2000-02-02

PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30)
PATENT ABSTRACTS OF JAPAN vol. 0160, no. 04 (E - 1151) 8 January 1992 (1992-01-08)

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