Matsushita Electric Industrial Co., Ltd.

Toshikazu Kaneko

Isao Kubo

Hirofumi Iwaki

Junichi Asaoka

Koichi Sato

Akira Iwase

Takeshi Okubo

Jun Miyoshi

Yoji Kajikawa

Toshina Saeki

After a negative electrode current collector has been inserted into an insertion hole therein, a resin sealing element and negative electrode terminal plate are successively inserted into an aperture of a battery casing, and the aperture rim of battery casing is then bent inwards and crimped to seal aperture of battery casing. Sealing element is accommodated within battery casing in an arrangement facing negative electrode terminal plate, with resin injection gate corresponding to resin injection port of metal molds during resin molding thereof positioned at the aperture end of battery casing.

Sealing structure for an alkali battery having a gate on an aperture side of a sealing element

The present invention relates to a process to manufacture alkaline cells by applying electrically conductive paint on an inner wall area of cathode container which contacts with cathode molds, and by heating said cathode container itself by applying electromagnetic induction in order to dry and/or cure the paint and to form a uniform electrically conductive coating layer adhered firmly on the inner wall of said container. By employing this process, continuous production of alkaline cells having excellent and uniform load characteristics which deteriorate very little became possible.

Manufacturing process of alkaline cell

The present invention provides a cylindrical alkaline battery comprising a positive electrode case of a cylindrical form having an opening at one end and accommodating an electricity-generating element comprising a positive electrode, a negative electrode, a separator and an alkaline electrolytic solution, an insulating gasket provided at the opening of the positive electrode case, a bottom plate being the negative electrode terminal provided on the gasket, and a heat-shrinkable member such as shrink tube or the like covering the outer surface of the positive electrode case. In this battery, the opening end of the positive electrode case and the outer surface of the battery extending therefrom are covered with an electrical insulating film. The presence of the electrical insulating film prevents the exterior short circuit between the positive electrode case and the bottom plate being the negative electrode terminal which may occur when the metal material of the case opening is exposed by the peeling or abnormal shrinkage of the heat-shrinkable member. The present invention also provides a cylindrical alkaline battery comprising a reinforcing washer provided between the bottom plate being the negative electrode terminal and the gasket. In this battery, electric insulation is established between the bottom plate being the negative electrode terminal and the washer or between the gasket and the washer and the presence or the electric insulation cuts off the possible electric reaction route forming a local cell and prevents the resultant leakage of the electrolytic solution.

Cylindrical alkaline batteries

Growing community of inventors

Hirakata, Japan

Toshikazu Kaneko