Patent ID: 8057933
Filing Date: 2011-11-15
Classification: H01M,Y02E

Abstract:
1. A safety mechanism for a laminate battery, the battery comprising power generation elements and an electrolyte both accommodated in an exterior case, the exterior case being formed by superposing two molded sheets made of laminate sheets upon one another and bonding them together around outer edges, thereby forming a bonded part, wherein the exterior case is provided with a projection that communicates with an internal space of the exterior case and protrudes outwardly from one side of the exterior case; wherein the safety mechanism includes a safety vent having an exhaust hole formed in at least one of the two molded sheets in the projection, and a valve element that seals the exhaust hole by making elastic pressure contact with a hole edge of the exhaust hole; and an exhaust passage forming component that guides gas from the exhaust hole to the outside, said exhaust hole having an upper edge; wherein part of the exterior case where the internal space accommodating the power generation elements communicates with the exhaust hole is not heat-sealed; and wherein the exhaust hole is positioned such that a distance between the upper edge of the exhaust hole and an inner edge of the bonded part relative to the outer edge of the projection on the protruded side of the exterior case is 1.5 mm or less.