| 摘要 |
A safety device comprising an anode cap that is attached to one end of a case and included a pressure receiving plate connected to an anode of an electrode body through a lead and being an innermost cap, a shielding plate electrically connected to the pressure receiving plate through a central contact section and being an intermediate cap, and a sealing plate electrically connected to the shielding plate and being an outermost cap is characterized in that a C-shaped groove is formed around a second flat contact surface being the central contact section of the shielding plate, a strength reducing groove is formed inside the C-shaped groove, and a narrow to-be-bent section is provided between the ends of the strength reducing groove and the portions spaced back from the ends of the C-shaped groove by predetermined distances. Therefore, rupture due to sharply increased inner pressure occurring on overcharging or short-circuit is completely prevented. The safety device for an enclosed cell is manufactured at low cost. |
