Patent ID: 9397325
Filing Date: 2016-07-19
CPC Classification: H01G,H01M,Y02E,Y02T

Claim Text:
1. A safety vent comprising: a gas permeated membrane through which gas generated inside an electrochemical device permeates; a vent that opens in a case in which pressure inside said electrochemical device is equal to or has exceeded a predetermined target pressure, and allows the gas to release to the outside of said electrochemical device through said gas permeated membrane; a housing case that internally houses said vent and said gas permeated membrane; and a joint portion that is empty inside, and formed integrally with said housing case, and attached to a gas spout out port of an exterior casing of said electrochemical device, wherein the vent comprises: wherein the vent is configured such that, in a case in which the pressure inside the electrochemical device is less than the predetermined target pressure, the vent body is pressed against the gas release hole of the vent seat by the spring means, and in a case in which the pressure inside the electrochemical device is equal to or exceeds the predetermined target pressure, the vent body separates from the gas release hole of the vent seat against the urging force applied by the spring means, and wherein a gap is formed between the gas permeated membrane and the vent.