Can type secondary battery and method of manufacturing...

Details Can type secondary battery and method of manufacturing... Can type secondary battery and method of manufacturing...

2008-10-16

2011-10-18

Ryan, Patrick (Department: 1726)

Chemistry: electrical current producing apparatus, product, and

Means externally releasing internal gas pressure from closed...

C156S280000

Reexamination Certificate

active

08039134

ABSTRACT:
A can type secondary battery and a method of manufacturing a circuit board for the secondary battery that improves reliability by providing a consistent breakdown pressure of the circuit board used in the can type secondary battery. The can type secondary battery includes an electrode assembly, a can to house the electrode assembly and a cap assembly combined with the can. The cap assembly includes a circuit board, which includes fiber layers and is broken by a safety vent when an internal pressure of the can is increased. A woven direction of the fiber layers is inclined with respect to a length direction of the circuit board. Distribution of the breakdown pressure among the circuit boards is decreased, and thus the circuit boards are broken under a consistent pressure, thereby improving the reliability of the can type secondary battery.

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SIPO Office action dated Feb. 16, 2011, for corresponding Chinese Patent application 200810174675.2, noting references previously cited in U. S. Office action dated May 24, 2010.

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