Patent ID: 8252480
Filing Date: 2012-08-28
Classification: F16J,H01M,Y02E

Abstract:
1. A gasket for reducing stress concentration in a fuel cell stack, the gasket comprising: a T-shaped or cross-shaped joint forming hydrogen, air and coolant manifolds, wherein the joint has a structure in which two first branches are connected to form an angle of 180° in opposite directions of each other, on one second branch is formed perpendicularly to the first two branches and the first two branches and the second branch joined at one point, wherein an indentation is formed on an outer periphery where the first two branches are connected, the indentation formed at a predetermined angle, the predetermined angle calculated based upon an angle required to reduce stress concentration on the T-shaped joint due to an externally applied compression force by deformation of the gasket; and a hole disposed between an inner most point of the indentation and a stress concentration point located within the second branch, and the distance between the inner most point of the indentation and the center of the hole is ¼-¾ a width (L) of a straight portion of at least one of the first branches.