Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yoshiro Maruhashi

Yoshiaki Yamamoto

Kazuo Kawahito

Katsuhisa Ishizaki

Kazuo Tadanobu

Masato Ozawa

Minoru Omori

Takuhisa Sugimoto

Yukihiro Take

Cathode electrode partof flat plate-like elementis joined with cathode com terminalwith a conductive adhesive or the like. Element mounting partof anode terminalis provided with a pair of joint partsfor wrapping anode electrode partfrom both sides. The tips of joint partsand anode electrode partare joined by laser welding such that the ratio (w/d) of the width (w) of each tip of joint partsand the diameter (d) of the welding trace to be welded is 0.5 to 1.5, and more preferably, 0.5 to 1.25 for providing low ESR means for concentrating the quantity of heat at the time of welding on welding partswithout escape. Therefore, a stable welded state is obtained, so that the ESR is improved for achieving low ESR of the solid capacitor.

Solid electrolytic capacitor

A solid electrolytic capacitor of the present invention has a structure where respective anode sections of capacitor elements are joined to an anode lead frame by resistance welding via a through hole formed in the anode lead frame. Current thus collects to the through hole during the welding to break a dielectric oxide film layer to expose aluminum foil, and the molten aluminum collects into the through hole. Stable welding work is therefore allowed without splashing the aluminum, and a solid electrolytic capacitor having high welding strength, high reliability, and reduced ESR can be obtained.

Solid electrolytic capacitor and its manufacturing method

Growing community of inventors

Kyoto, Japan

Yoshiro Maruhashi