Lithium ion secondary battery having shape memory safety vent

Chemistry: electrical current producing apparatus – product – and – Means externally releasing internal gas pressure from closed...

Reexamination Certificate

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C429S054000, C429S057000, C429S062000

Reexamination Certificate

active

08084152

ABSTRACT:
A lithium ion secondary battery has a shape memory safety vent adapted to discharge internal compressed gas by temporarily being opened when the temperature reaches a predetermined level to avoid a swelling phenomenon of the battery and improve safety. The lithium ion secondary battery includes an electrode assembly having first and second electrode plates wound a number of times with a separator interposed between them; a can having an opening formed on a side thereof to contain the electrode assembly; and a cap plate adapted to cover the can and provided with a vent hole on a side thereof, to which a safety vent adapted to deform at a predetermined temperature and discharge gas from inside the can to the exterior is coupled.

REFERENCES:
patent: 6080505 (2000-06-01), Pate
patent: 6579640 (2003-06-01), Nagase et al.
patent: 2004/0038126 (2004-02-01), Gu
patent: 2006/0024574 (2006-02-01), Yim et al.
patent: 1487613 (2004-04-01), None
patent: 10074500 (1998-03-01), None
patent: 2000-067840 (2000-03-01), None
patent: 1999-002560 (1999-01-01), None
patent: 2000-0021323 (2000-04-01), None
Korean Patent Abstract, Publication No. 1020000021323 A, published Apr. 25, 2000, in the name of Dae Jun Kim, et al.
Chinese Office action dated Dec. 1, 2006, for CN 200510102414.6.
English translation of Chinese Office action dated Dec. 1, 2006.

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