Abstract: The electrochemical cell of the present invention is provided with a hermetic container having a base member, a jointing material fixed to the base member, and a lid member welded on the base member via the jointing material, and in which a housing space sealed between the base member and the lid member is defined, and an electrochemical element which is housed inside the housing space and which is available to effect charging and discharging, wherein the lid member is made of stainless steel.

Abstract: An electric double-layer capacitor is provided in which an upper end portion of a recessed container is sealed by a sealing plate. An electrode and an electrode are accommodated in a hollow portion formed by a recessed portion and the sealing plate. One step portion is formed in the middle of one inner peripheral surface of the recessed portion, and another step portion is formed in the middle of the other opposing inner peripheral surface. The one step portion and said another step portion are formed at the same height, and upper surfaces of those step portions exist on the same plane.

Abstract: The electrochemical cell of the present invention is provided with a hermetic container having a base member, a jointing material fixed to the base member, and a lid member welded on the base member via the jointing material, and in which a housing space sealed between the base member and the lid member is defined, and an electrochemical element which is housed inside the housing space and which is available to effect charging and discharging, wherein the lid member is made of stainless steel.

Abstract: Provided is an electric double-layer capacitor and the like, which may be easily manufactured. In a recessed container (2) constituting a package of an electric double-layer capacitor (1), a step portion (4) is formed. With this, the recessed container (2) has two parallel bottom surfaces which are not provided in the same plane, that is, a first bottom surface constituting a bottom portion of a recessed portion (13) and a second bottom surface constituting an upper surface of the step portion (4). The first bottom surface and the second bottom surface respectively have metallic layers (11, 9) formed thereon, which pass through the recessed container (2) toward an outside to respectively connect to terminals (12, 10). Electrodes (6, 5) are respectively connected to the upper surfaces of the metallic layers (11, 9).

Abstract: An electric double-layer capacitor is provided in which an upper end portion of a recessed container is sealed by a sealing plate. An electrode and an electrode are accommodated in a hollow portion formed by a recessed portion and the sealing plate. One step portion is formed in the middle of one inner peripheral surface of the recessed portion, and another step portion is formed in the middle of the other opposing inner peripheral surface. The one step portion and said another step portion are formed at the same height, and upper surfaces of those step portions exist on the same plane.

Abstract: Provided are an electrolytic solution for an electric double layer capacitor capable of providing an electric double layer capacitor having stable quality, an electric double layer capacitor using the electrolytic solution, and a manufacturing method for the electric double layer capacitor. The electrolytic solution includes a supporting electrolyte, sulfolane, and a linear sulfone. It is preferred that the electrolytic solution further include an organic fluorine compound. Further, it is preferred that the supporting electrolyte contain 5-azoniaspiro[4.4]nonane tetrafluoroborate, and the content of 5-azoniaspiro[4.4]nonane tetrafluoroborate be 1.5 to 3.6 mol/dm3.

Abstract: Provided is an electric double-layer capacitor and the like, which may be easily manufactured. In a recessed container (2) constituting a package of an electric double-layer capacitor (1), a step portion (4) is formed. With this, the recessed container (2) has two parallel bottom surfaces which are not provided in the same plane, that is, a first bottom surface constituting a bottom portion of a recessed portion (13) and a second bottom surface constituting an upper surface of the step portion (4). The first bottom surface and the second bottom surface respectively have metallic layers (11, 9) formed thereon, which pass through the recessed container (2) toward an outside to respectively connect to terminals (12, 10). Electrodes (6, 5) are respectively connected to the upper surfaces of the metallic layers (11, 9).

Abstract: A secondary battery comprising a positive electrode, a negative electrode, and an electrolyte is improved in discharge performance by forming the positive electrode from a composite electrode material including a conductive organic polymer and a dischargeable metal oxide and/or metal chalcogenide.

Abstract: An electric cell comprising a positive electrode, a negative electrode, and an electrolyte maintains excellent performance when the positive electrode is an electro-conductive polymer composite including a mesh stainless steel having a wire diameter of about 35-120 .mu.m and an electro-conductive polymer, typically polyaniline, integrally deposited onto the mesh by electrolytic polymerization. A container having the elements received therein is provided with a vent mechanism.

Abstract: An electric cell comprising a positive electrode, a negative electrode, and an electrolyte containing a lithium salt is provided wherein the negative electrode has a two-layer structure of a lithium-aluminum alloy layer and an aluminum layer. The cell is fabricated by placing a positive electrode, a negative electrode, and an electrolyte in a cell container comprising positive and negative electrode casings, and forming a seal between the positive and negative electrode casings. The negative electrode is electrochemically formed in situ in the cell container from a lithium-clad aluminum substrate.

Abstract: In an electrochemical cell comprising a positive electrode, a negative electrode, and an electrolyte, a film of electroconductive polymeric material having a conductor embedded therein at approximately the mid point of the film is used as an electrode active material and a collector associated therewith.