Patent ID: 6139986
Filing Date: 2000-10-31
Classification: H01M,Y02E,Y02P

Abstract:
A lithium secondary battery comprising:an electricity generating portion in which a negative electrode and a positive electrode form a laminate with separator films made of porous polymer, said separator films preventing said negative electrode and said positive electrode from directly contacting one another;an external terminal electrically connected to said positive electrode;an external terminal electrically connected to said negative electrode;a metal battery case connected to one of said external terminals, said case being part of a current path;an insulating plate for electrically insulating one of said external terminals from said battery case; anda current break mechanism replaceably mounted within said battery case and comprising a low melting point alloy member in said current path and for connecting the external terminal that is electrically insulated from the battery case with one of said positive and negative electrodes;wherein said low melting point alloy member melts to break said current path when said member exceeds its melting point, said low melting point alloy member being inserted into a recess portion of a bolt for fixing a negative output plate and in press contact with a negative internal plate, thereby forming a current path between said negative internal plate and said negative output plate as an integrated member under normal operating conditions.