Toshiba Battery Co., Ltd.

Nissan Motor Company Limited

Kazuo Kojima

Tomoyuki Ono

Kouji Taguchi

Hideaki Kitazume

Hideaki Kozawa

Hirofumi Yanagawa

A rectangular nickel-metal hydride secondary cell permits improving the air-tightness and also permits preventing a metal case from being deformed in a step of folding an open end portion of the metal case. The rectangular nickel-metal hydride secondary cell, includes a rectangular cylindrical metal case having a bottom, an electrode group housed in the metal case, an alkali electrolyte contained in the metal case, a rectangular sealing plate mounted near the open end portion of the metal case. An insulating gasket is interposed in a compressed state between the inner wall near the open end of the metal case and the sealing plate. The metal case comprises a folded portion formed by inwardly folding the open end portion of the metal case and an inwardly projecting stepped portion formed along the inner surface of the metal case below the folded portion. The sealing plate is fixed to the metal case at the portion between the folded portion and the stepped portion of the metal case with the insulating gasket interposed therebetween, the folded portion at a corner portion of the open end portion of the metal case has an angle of 80.degree. to 100.degree.. Such a secondary cell can be formed by a process which includes charging-discharging cycles, an aging step, and a full charging step.

Method of manufacturing a nickel-metal hydride secondary cell

A rectangular nickel-metal hydride secondary cell permits improving the air-tightness and-also permits preventing a metal case from being deformed in the step of folding an open end portion of the metal case. The rectangular nickel-metal hydride secondary cell, comprising a rectangular cylindrical metal case having a bottom, an electrode group housed in the metal case, an alkali electrolyte contained in the metal case, a rectangular sealing plate mounted near the open end portion of the metal case; and an insulating gasket interposed in a compressed state between the inner wall near the open end of the metal case and the sealing plate, wherein the metal case comprises a folded portion formed by inwardly folding the open end portion of the metal case and an inwardly projecting stepped portion formed along the inner surface of the metal case below the folded portion, the sealing plate is fixed to the metal case at the portion between the folded portion and the stepped portion of the metal case with the insulating gasket interposed therebetween, the folded portion at a corner portion of the open end portion of the metal case has an angle of 80.degree. to 100.degree..

Method of making a rectangular nickel-metal hydride secondary cell

A rectangular nickel-metal hydride secondary cell permits improving the air-tightness and also permits preventing a metal case from being deformed in the step of folding an open end portion of the metal case. The rectangular nickel-metal hydride secondary cell, comprising a rectangular cylindrical metal case having a bottom, an electrode group housed in the metal case, an alkali electrolyte contained in the metal case, a rectangular sealing plate mounted near the open end portion of the metal case; and an insulating gasket interposed in a compressed state between the inner wall near the open end of the metal case and the sealing plate, wherein the metal case comprises a folded portion formed by inwardly folding the open end portion of the metal case and an inwardly projecting stepped portion formed along the inner surface of the metal case below the folded portion, the sealing plate is fixed to the metal case at the portion between the folded portion and the stepped portion of the metal case with the insulating gasket interposed therebetween, the folded portion at a corner portion of the open end portion of the metal case has an angle of 80.degree. to 100.degree..

Rectangular nickel-metal hydride secondary cell

An air-fuel ratio feedback control system for an automotive internal combustion engine equipped with an evaporative emission control device having an activated charcoal cansiter for absorbing fuel vapor from a fuel tank. The air-fuel ratio feedback control system is operated as follows: The air-fuel ratio of air-fuel mixture to be inducted into the engine is detected in accordance with a component of exhaust gas discharged from the engine. An air-fuel ratio feedback correction coefficient is set in accordance with the air-fuel ratio in such a manner as to be modified by a feedback control constant in response to the state of the air-fuel ratio relative to stoichiomeric value. The amount of fuel to be supplied to the engine is corrected with the air-fuel ratio feedback correction coefficient. Additionally, the feedback control constant is enlarged for a predetermined time when the evaporative emission control device is so operated that the fuel vapor stored in the activated charcoal canister is sucked into the engine, thereby improving follow-up ability of air-fuel ratio feedback control thus to improve exhaust emission control and driveability of the engine.

Growing community of inventors

Yokohama, Japan

Kazuo Kojima