Patent ID: 9406912
Filing Date: 2016-08-02
CPC Classification: H01M,Y02E,Y02T

Claim Text:
1. A sealed battery comprising an electrode body that constitutes a positive electrode and a negative electrode; an electrolyte; a case in which the electrode body and the electrolyte are accommodated and sealed; and a safety valve formed in part of the case, the safety valve being configured to open when an internal pressure in the case rises to or above a predetermined level, wherein the safety valve is formed from a part of the case itself, the safety valve has a thin portion that is thinner than a peripheral portion of the safety valve, the thin portion being integrally formed with the case by thinning a part of the case, the thin portion of the safety valve is formed on an inner surface side of the case, and a slit, which prevents conduction of heat, to the thin portion, from another portion of the case, is formed on an inner surface side of the case at a peripheral portion of the thin portion, to a depth, from the inner surface of the case at a peripheral portion of the thin portion that exceeds at least a wall thickness of the thin portion, in such a manner that the slit surrounds the thin portion, wherein the peripheral portion of the thin portion at which the slit is formed is thicker than the thin portion.