Patent ID: 8039135
Filing Date: 2011-10-18
Classification: H01M,Y02E,Y02P

Abstract:
1. A center pin assembly to be inserted into a winding center of an electrochemical device having a case containing a winding-type electrode assembly, the center pin assembly comprising: a center pin manufactured by winding a planar substrate into a tubular shape, the planar substrate having at least two protrusions formed in an embossing type or formed by at least two discontinuous scores having a predetermined shape; and a container placed in a space inside the center pin, while being placed separately from the center pin, the container comprising one or more hollow cylindrical tubes containing a substance capable of improving safety of the device, wherein the at least two protrusions are formed on an outer peripheral surface of the center pin, and the protrusions are configured to fracture the winding-type electrode assembly so that at least one short circuit is created intentionally, when pressure of a predetermined level or higher is applied from an outside.