Ngk Insulators, Inc.

Teruhisa Kurokawa

Kenshin Kitoh

Hiroshi Nemoto

Tsuneaki Ohashi

Nobuo Tsuno

Takeyuki Mizuno

A lithium secondary battery comprising a case, an internal electrode body inside the case, electrolyte contained in the case, and an insulator between the case and a terminal. Also, a lithium secondary battery comprising a body member, electrolyte contained in the body member, an internal electrode body inside the body member, an and cap and an insulator between the body member and the end cap. In each battery, the internal electrode body comprises a positive electrode, a negative electrode and a separator between the electrodes, being electrically insulated from each other. In each battery, a first terminal is electrically connected to the negative electrode, and a second terminal is electrically connected to the positive electrode. The insulator comprises ethylene-propylene rubber, has surface hardness of from 30 (durometer A) to 60 (durometer D), and has volume resistivity of at least 10&#x3a9;-cm.

Lithium secondary battery

A lithium secondary battery includes an internal electrode body including a positive electrode, a negative electrode, a separator, the positive electrode and the negative electrode being wound via the separator so that the positive electrode and the negative electrode are not brought into direct contact with each other, an organic electrolyte, and a battery case containing the internal electrode body. A pipe is used as the battery case. The lithium secondary battery is excellent in reliability and can be produced at low processing costs.

A lithium secondary battery includes a battery case, an internal electrode body contained in the battery case and including a positive electrode, a negative electrode and a separator made of porous polymer. The positive electrode and the negative electrode are wound or laminated so that the positive electrode and negative electrode are not brought into direct contact with each other via the separator. The respective resistance value of multiple tabs for electricity collection to be connected to the positive electrode and negative electrode was set to remain within the range of &plusmn;20% of the average resistance value of the tabs. The lithium secondary battery maintains a good charge-discharge characteristic even during high-output cycle operation and in particular may be preferably used for a drive motor of an electric vehicle.

A lithium secondary battery includes a battery case, and an internal electrode body contained in the battery case and including a positive electrode and a negative electrode wound through a separator film made of porous polymer, and uses a nonaqueous organic electrolyte. Opposing pressure release mechanisms are disposed at both ends of the battery case in the winding direction of the positive electrode and the negative electrode. The lithium secondary battery is simple in fabrication, has small internal resistance, and is superior in safety. Preferably, the ratio of the total area of opening portions where the pressure release mechanisms operate to the battery capacity is kept within a predefined range.

A lithium secondary battery includes: a battery case, and an internal electrode body,contained in the battery case and including a positive electrode,a negative electrode,and a separator,made of porous polymer. The positive electrode and the negative electrode are wound through the separator so that the positive electrode and the negative electrode are not brought into contact with each other. At least one of the positive electrode,and negative electrode,has two or more divided electrodes. The lithium secondary battery is excellent in the charging/discharging cycle characteristics, has high reliability, and is used particularly as a battery for driving a motor of an electric vehicle.

Lithium secondary battery including a divided electrode base layer

A lithium secondary battery includes an electricity generating portion in which positive electrode 60 and negative electrode 61 form a laminate through separator films 62 made of porous polymer so that the positive electrode 60 and the negative electrode 61 do not come in direct contact with each other, leads 65, 77 which are respectively connected to plural portions of the positive electrode 60 and the negative electrode 61 to make electricity collection, and a low melting point alloy member 76 as a current break mechanism being inserted in a current path of the inside of the battery, which is melted to break the current path when the temperature of the battery is raised over a predetermined temperature.

A method for increasing the oxidation resistance of a Fe-Cr-Al alloy, which comprises placing said Fe-Cr-Al alloy in an atmosphere having an oxygen partial atmosphere of 0.02-2 Pa at a temperature of 950.degree.-1,200.degree. C. to form, on the surface of said alloy, an alumina-based protective film having excellent oxidation resistance. Said method enables the formation of a homogeneous protective film having excellent oxidation resistance, even on alloys having non-homogeneous compositions, such as Fe-Cr-Al alloy and the like, and is very effective for increasing the oxidation resistance of Fe-Cr-Al alloy.

Method for increasing oxidation resistance of Fe-Cr-Al alloy

Disclosed herein is a method of manufacturing ceramics, which comprises the steps of: applying a film of an elastic material on a ceramic shaped body and hydrostatically pressing the resulting shaped body, heating the pressed body while being buried into an inorganic powder having an average particle size of 10 to 300 .mu.m to remove the elastic film, and firing the resulting body.

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Ama-gun, Japan

Teruhisa Kurokawa