Title:
HERMETICALLY SEALED SECONDARY BATTERY
Document Type and Number:
Japanese Patent JP2016122581
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hermetically sealed secondary battery that has a high current interruption mechanism having heat resistance and can prevent deformation (creep) and fusion of a collector plate which are caused by Joule heat under high-rate charging/discharging.SOLUTION: A current interruption mechanism 80 of a hermetically sealed secondary battery 10 is configured so that when the inner pressure of a case 12 increases over a predetermined level, a current interruption valve 30 is deformed to be away from a plate-like collector plate 72 due to the inner pressure, and the collector plate is broken at a portion of an annular groove 79 of a center thin-wall portion 74 of the collector plate. Plural pores which are further concaved from the bottom surface of the annular groove 79 are formed along the bottom surface of the groove at the portion corresponding to the bottom surface of the annular groove 79 out of the center thin-wall portion 74 of the collector plate.SELECTED DRAWING: Figure 3
Inventors:
ITABASHI TOSHIYUKI
Application Number:
JP2014261968A
Publication Date:
July 07, 2016
Filing Date:
December 25, 2014
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
H01M2/34; H01M2/26; H01M10/04
Attorney, Agent or Firm:
Makoto Abe
Michiko Oi
Hiroaki Yamane
Michiko Oi
Hiroaki Yamane