Seal for electrochemical cell

Details Seal for electrochemical cell Seal for electrochemical cell

H - Electricity

01

M

H01M 2/08 (2006.01) H01M 2/04 (2006.01) H01M 2/12 (2006.01)

Patent

CA 2196988

An electrochemical cell has a wheel shaped molded plastic seal member (10) of a unitary construction which includes a central cylindrical hub (12) from which depend in outward radial sequence, an annular pressure vent (18), a boss (26), a downward projecting skirt (30), an annular flexure means (38), for providing radial movement and an outer rim terminating at its periphery in a cylindrical wall (40). The pressure vent (18) includes a thin membrane ring (22) depending from the hub (12) which joins the hub (12) to an annular diaphragm (20). A hinged ring (24) joins the periphery of the diaphragm (20) to the boss (26). The seal (10) member is designed so that the membrane ring (22) fails primarily in shear at excessive cell pressure which makes the vent (18) more reliable and easier to fabricate.

Cellule électrochimique munie d'un opercule (10) monobloc en plastique moulé en forme de roue comportant un moyeu cylindrique (12) dont dépend une séquence radiale extérieure, un évent de surpression annulaire (18), un bossage (26), une jupe (30) dirigée vers le bas, un moyen de flexion (38) annulaire permettant un jeu radial et une jante extérieure dont la périphérie se prolonge par une paroi cylindrique (40). L'évent de surpression (18) comporte une fine membrane annulaire (22) dépendant du moyeu (12) et le reliant à un diaphragme annulaire (20). Une bague articulée (24) relie la périphérie du diaphragme (20) au bossage (26). L'opercule (10) est conçu pour que la membrane annulaire (22) se rompe la première par cisaillement en cas de pression trop forte dans la cellule, d'où un évent (18) plus fiable et plus facile à fabriquer.

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