Patent ID: 8808900
Filing Date: 2014-08-19
Classification: H01M,Y02E,Y02P

Abstract:
1. A cylindrical lithium ion secondary battery comprising: an electrode assembly; a center pin positioned within the electrode assembly; a circuit member contained in the center pin and adapted to be short-circuited when a charging voltage is equal to or larger than a reference voltage, the circuit member comprising: a heating member connected between the battery and the emitter of the transistor, the heating member having a gasification member mounted thereon, which gasifies at a predetermined temperature and increases an internal pressure of the battery; a can receiving the electrode assembly and the center pin, which contains the circuit member; and a cap assembly coupled to a top of the can, wherein the gasification member comprises at least one material selected from the group consisting of cyclo hexyl benzene (CHB) and biphenyl (BP).