| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery provided with an easily exchangeable safety valve always automatically adjusting battery internal pressure. SOLUTION: This nonaqueous electrolyte secondary battery is provided with; a ring member made of an elastic material, a connector having a circular groove with a bottom surface to which an inner circumference of the ring member closely contacts by its elastic force and a passage hole opening in the bottom surface of the circular groove and communicated with the inside of a battery can. When battery internal pressure becomes a certain value, for example, 0.15 MPa by gas generated in the battery, the ring member is expanded by gas pressure to leak the gas. COPYRIGHT: (C)2007,JPO&INPIT |
