| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealed battery stabilizing large current discharge at normal time and securing safety at abnormalities of the battery, at low cost. SOLUTION: Sealed cylindrical lithium ion secondary battery is provided with a top lid 21 having an explosion-proof mechanism. The explosion-proof mechanism is equipped with a dish-shaped conductive diaphragm having a flat part at the center, and a splitter 18 electrically connected to an electrode group and equipped with a thin part lifted up toward the diaphragm 2 side in a planate shape at the center. The thin part of the splitter 18 is jointed to the flat part of the diaphragm 2. An outer diameter of the thin part at the diaphragm 2 side is larger than that at a rear face side opposite to the diaphragm 2. The jointed part of the splitter 18 and the diaphragm 2 is kept adhered. COPYRIGHT: (C)2005,JPO&NCIPI |
