Sodium secondary battery
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMasayuki Fukagawa, Keiichi Iwamoto, Nozomu Kawasetsu, Katsuzou Sudou, Akihiro Sawata
Life of this patent
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Abstract
A sodium secondary battery which assures excellent sealing and can be manufactured in a simple manner is provided. The battery includes a negative electrode chamber defined by the inside of a bottom-closed, hollow cylindrical, solid electrolyte accommodated in an outer case and a positive electrode chamber formed outside the solid electrolyte and containing a porous electrode 4 impregnated with sulfur which serves as a positive electrode active substance. A cover, which closes the opening portion of the outer case, is fastened to the outer case by use of bolts and the interposition of an insulator.
Claims15
A sodium secondary battery, comprising:
- an outer case having a discrete end member secured thereto and defining an opening portion therein:
- a negative electrode chamber defined by a bottom-closed hollow cylindrical solid electrolyte accommodated in the outer case;
- a positive electrode chamber formed outside the solid electrolyte,
- a cover which closes the opening portion being fastened to the end member by bolts;
- and, an insulator interposed between the end member and the cover;
- and
- wherein the cover and the end member are comprised of the same material and the linear coefficient of expansion thereof is greater than that of the insulator.
A sodium secondary battery, comprising:
- an outer case having a discrete end member secured thereto and defining an opening portion therein;
- a positive electrode chamber defined by a bottom-closed hollow cylindrical solid electrolyte accommodated in the outer case;
- a negative electrode chamber formed outside the solid electrolyte;
- an insulator which also serves as a cover located on the opening portion and being fastened to the end member by bolts;
- and,
- wherein the end member has a linear coefficient of expansion different from that of the insulator.
A sodium secondary battery, comprising
- a negative electrode chamber;
- a positive electrode chamber;
- and
- a plate-like solid electrolyte interposed between the negative and positive electrode chambers such that a negative electrode container having an outwardly projecting flange and a positive electrode container having an outwardly projecting flange are placed on opposite sides with respect to the solid electrolyte, wherein
- an insulator is provided along the periphery of the solid electrolyte, and the flange of the negative electrode container and the flange of the positive electrode chamber are fastened to each other by bolts while interpositioning the insulator between the flanges.
A battery, comprising:
- an outer case including a discrete end member secured thereto having an opening;
- a cylindrical electrolyte defining a first electrode chamber and a second electrode chamber on opposite sides outside thereof;
- a cover that closes the opening of said outer case;
- an insulator provided between said end member and said cover;
- at least one bolt that secures said cover to said end member;
- and,
- wherein the cover and the end member are comprised of the same material and the coefficient of expansion thereof is different from that of the insulator.
A battery, comprising:
- a first container having a first flange portion at a peripheral portion thereof,
- a second container having a second flange portion at a peripheral portion thereof, said first and second containers defining a chamber therein;
- an electrolyte provided inside said chamber, said first container and said electrolyte defining a first electrode chamber, and said second container and said electrolyte defining a second electrode chamber;
- an insulator provided between said first and second flange portions;
- and
- at least one bolt that secures said first flange portion to said second flange portion.
Dependencies are inferred from the claim text.