Toyota Jidosha Kabushiki Kaisha

Hiroya Kondou

Masato Komatsuki

Kaoru Yugahara

Hiroki Nagai

Satoshi Suzuki

Yoichi Naruse

Youichi Naruse

Takashi Nakazawa

Takato Fujiki

A cell assembly () is formed by arranging an electrode body and electrolyte in an external case () having a through hole (). A laser is applied to an annular portion (formed by Al or Al-based alloy) surrounding an opening end (A) of the through hole () toward outside the case so as to form a welded base (). A sealing film () is welded to the surface of the welded base directly or via a base film () welded in advance, so as to temporarily seal the through hole (). The cell assembly () in the temporarily sealed state is subjected to initial charge and then a hole is opened through the film () so as to form a gas discharge passage for communication between inside and outside of the case (), thereby discharging an excessive gas from the case () outside.

Sealed type cell manufacturing method

A battery is equipped with a case () in which a fill opening (aperture) () is formed and a sealing cap (), which closes the fill opening () formed in the case (). The sealing cap () is formed of a thin plate that covers the fill opening () in the case (), the circumferential edge () of the sealing cap () is bonded to the case (), and the center () of the sealing cap () is bent from the circumferential edge () and bulges up toward the outside of the case (). In addition, a chamfer () is applied at the bent corner of the sealing cap ().

Battery

A sealed battery includes a battery case with a liquid inlet, a power generating element in the case, a lid member closing the liquid inlet and having a peripheral edge welded to the case over the entire circumference, a circular groove in the outer surface of the case and around the entire periphery of the liquid inlet, a peripheral portion provided over the entire periphery of a portion in the back surface of the lid member facing the liquid inlet, and a protrusion partially placed around the liquid inlet between the circular groove and the peripheral portion to form a clearance between the circular groove and the peripheral portion. The space facing the inner surface in a portion melted during welding between the peripheral edge and the case is continuous to the liquid inlet through a clearance formed by the protrusion between the circular groove and the peripheral portion.

Sealed battery and manufacturing method thereof, vehicle mounting the sealed battery, and battery mounting device mounting the sealed battery

Growing community of inventors

Toyohashi, Japan

Hiroya Kondou