Chemistry: electrical current producing apparatus – product – and – Sealed cell having gas prevention or elimation means
Reexamination Certificate
2011-06-07
2011-06-07
Yuan, Dah-Wei D (Department: 1727)
Chemistry: electrical current producing apparatus, product, and
Sealed cell having gas prevention or elimation means
C429S120000
Reexamination Certificate
active
07955724
ABSTRACT:
Disclosed herein is a secondary battery which comprises a film (“safety film”) including expansible graphite that generates inflammable gas at a high temperature and polyurethane that causes an endothermic reaction and generates char at a high temperature. The safety film is a thin member, and therefore, the secondary battery according to the present invention has effects in that the safety film can be easily attached to a region of the secondary battery where the operating components of the secondary battery are not affected. In addition, the graphite component and the polyurethane component included in the safety film provide effective and perfect inflammability by virtue of the inflammable gas and char generated from the graphite component and the polyurethane component, respectively.
REFERENCES:
patent: 2005/0281999 (2005-12-01), Hofmann et al.
patent: 10-2006-0034181 (2006-04-01), None
English machine translation of KR10-2006-0034181 provide by KIPO.
Kim Bo Hyun
Park Hyun-woo
Yoo Kwangho
Cantor & Colburn LLP
Laios Maria J
LG Chem Ltd.
Yuan Dah-Wei D
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