초록 ▼

A sealed type battery is disclosed which can reduce variations in the operating pressure of a safety valve, improve the reliability for the airtightness of a battery vessel, remove the contact of electrode plates and the case due to the rightward or leftward deviation of a group of electrode plates

A sealed type battery is disclosed which can reduce variations in the operating pressure of a safety valve, improve the reliability for the airtightness of a battery vessel, remove the contact of electrode plates and the case due to the rightward or leftward deviation of a group of electrode plates in the direction of the winding shaft, remarkably reduce the internal short-circuiting production rate, and realize cost lowering or reduction in the number of working steps. The battery is equipped with a safety valve in which a cover plate having a hole, a metal thin plate and a holding plate of metal having a hole are stacked with the metal thin plate sandwiched and integrally fixed by laser welding. Further, the center line of the winding axis of a group of spiral electrodes is in parallel to the opening face of a battery case and the width of a separator in the direction of the winding axis is larger than the side of the opening portion of a angular tubular case in parallel to the direction of the winding axis.

대표청구항 ▼

A sealed battery including a safety valve device in which metal plates in a laminate are integrally fixed by laser welding, said laminate being comprised of a cover plate having a hole, a metal thin plate, and a holding plate having a hole defined by a perimeter, characterized in that the hole of th

A sealed battery including a safety valve device in which metal plates in a laminate are integrally fixed by laser welding, said laminate being comprised of a cover plate having a hole, a metal thin plate, and a holding plate having a hole defined by a perimeter, characterized in that the hole of the holding plate extends throughout an entire area between the perimeter, and the metal thin plate is arranged between the cover plate and the holding plate so as to contact a bottom surface of the cover plate and a top surface of the holding plate and interrupt a gas discharging hole formed by the holes of the metal thin plate and cover plate.