Toyota Jidosha Kabushiki Kaisha

Masato Komatsuki

Kaoru Yugahara

Hiroya Kondou

Hiroyuki Nakayama

Yasuhide Kurimoto

Makoto Nakashima

Hiroki Nagai

Satoshi Suzuki

Takashi Harayama

Yoichi Naruse

Youichi Naruse

Hikohito Yamazaki

Takashi Nakazawa

Takato Fujiki

Jumpei Iijima

A battery capacity estimation unit estimates a battery in battery capacity based on information regarding the battery's use history. A moisture intrusion estimation unit estimates an amount of moisture intruding into the battery. A battery capacity correction unit uses the estimated amount of intruding moisture to correct the estimated battery capacity.

Battery system

A PC executes a control process including the steps of: calculating an internal pressure increase amount P; calculating an internal pressure fluctuation amount &#x394;P; calculating a deterioration evaluation value D1; calculating a deterioration evaluation value D2; determining that a battery can be shipped as a secondhand battery when D1+D2 is equal to or smaller than a threshold value A; and determining that the battery cannot be shipped as a secondhand battery when D1+D2 is larger than the threshold value A.

Deterioration determining device for battery

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

An object is to provide a battery with good durability, and a vehicle and a battery-mounting device each having such a battery mounted therein. A battery includes a positive electrode terminal member made of aluminum, a negative electrode terminal member made of copper, a positive electrode resin member made of an insulating resin, covering a part of the terminal member in tight contact therewith, and a negative resin member made of an insulating resin, covering a part of the terminal member in tight contact therewith. A positive electrode resin adhesion surface and a negative electrode resin adhesion surface each have been subjected to a surface treatment. A negative electrode sealing length of a shortest path of negative seal paths is longer than a positive electrode sealing length of a shortest path of positive electrode seal paths.

Battery, vehicle, and battery-mounting device

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.

Growing community of inventors

Hashima-gun, Japan

Masato Komatsuki