Apparatus for and method of forming seals in an...

H - Electricity – 01 – M

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H01M 2/02 (2006.01) B05C 1/02 (2006.01) B05C 9/00 (2006.01) B05C 11/00 (2006.01) F16J 15/14 (2006.01) H01M 2/08 (2006.01) H01M 8/02 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2603293

A sealing and repair technique is provided for forming complex and multiple seal configurations for fuel cells and other electrochemical cells. To provide a seal, for sealing chambers for oxidant, fuel and/or coolant, a groove network is provided extending through the various elements of the fuel cell assembly. A source of seal material is then connected to an external filling port and injected into the groove network, and the seal material is then cured to form the seal. There is thus formed a "seal in place", that is robust and can accommodate variations in tolerances and dimensions, and that can be bonded, where possible, to individual elements of the fuel cell assembly. To repair part of an electrochemical cell stack, some elements are removed and either repaired or replaced. The cell assembly is then put together again and a bore is provided for injection of fresh seal material. This bore can either have been formed in the original assembly or is formed by mechanical removal of part of the original seal material.

L~invention décrit une technique d'étanchéification et de réparation destinée à former des configurations à joints complexes et multiples pour piles à combustible et autres piles électrochimiques. Afin d~étanchéifier des enceintes contenant de l~oxydant, du combustible et/ou du réfrigérant, un réseau de rigoles couvrant la totalité des divers éléments de la pile à combustible est prévu. Une source de matériau d~étanchéité est alors raccordée à un orifice de remplissage externe, suite à quoi le matériau est injecté dans le réseau de rigoles et durci pour former le joint. Est ainsi formé un « joint in situ » robuste et capable de s~accommoder de changements de tolérances et de dimensions, et qui peut être lié, lorsque cela est possible, à des éléments indépendants de l~ensemble formant pile à combustible. Pour réparer une partie d~un empilement de piles électrochimiques, certains éléments sont retirés tandis que d~autres sont réparés ou remplacés. L~ensemble formant la pile est ensuite réassemblé et un trou est pratiqué pour permettre d'injecter du matériau d'étanchéité frais. Ce trou peut avoir été formé dans l~ensemble d~origine ou il est formé par enlèvement, par un moyen mécanique, d~une partie du matériau d~étanchéité d~origine.

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