| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat electrochemical cell which sufficiently secures airtightness and steam barrier performance inside an outer package using the outer package in which a laminate consisting of a composite film is made into a bag shape or a tray shape, and prevents blowing-out of the outer package due to increase of internal pressure by releasing the gas inside and also prevents leakage of electrolyte. SOLUTION: A safety valve 6 for releasing gas generated inside the outer package is installed at a part of the peripheral portion of the outer package 10, and the safety valve 6 is constructed of a valve 9 which opens when the gas pressure inside the outer package exceeds a prescribed value, a housing part 8 which houses the gas and electrolyte which have passed the valve 9, and a gas permeation part 7 which permeates only the gas. The housing part 8 is made a non-sealed region installed at a part of the outer package peripheral portion and the gas permeation part 7 is made a porous fluororesin sheet which closes an outer package aperture formed on the non-sealed region. COPYRIGHT: (C)2008,JPO&INPIT |
