Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Yuko Ogawa

Hideharu Takezawa

Hiroyuki Okuda

Hirokazu Uchiyama

Yuki Tokuda

Kazuyoshi Honda

Satoshi Shibutani

Hiroyuki Kita

Hideki Kuwajima

Hiromasa Yagi

Sadayuki Okazaki

Daisuke Suetsugu

Yasuharu Shinokawa

Kazuhiro Baba

Minoru Isayama

Toshikazu Sanda

Yoshiaki Shinno

An electrode group includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a positive electrode lead electrically connected to the positive electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer carried on each main surface of the positive electrode current collector. The positive electrode current collector has an exposed section that does not carry the positive electrode active material layer. The negative electrode includes a negative electrode current collector and a negative electrode active material layer carried on each main surface of the negative electrode current collector and has a first region and a second region. The mass of the negative electrode active material layer in the first region per unit area is smaller than the mass of the negative electrode active material layer in the second region per unit area.

Secondary battery

The cylindrical secondary battery is provided with a wound electrode body, a positive electrode tab connected to a positive electrode, a cylindrical case body for housing the electrode body and the positive electrode tab, and a sealing body for sealing an opening of the case body. A negative electrode has, at a winding end of the negative electrode, a negative electrode current collector exposure section where no negative electrode active material layer is disposed, and the negative electrode current collector exposure section is disposed in contact with an inner surface of the case body. The positive electrode tab is disposed at the center in the longitudinal direction of the positive electrode and in a region where the number of layers of the positive electrode in a radial direction is smaller than in other regions in a cross-sectional area of the wound electrode body.

Cylindrical secondary battery

A secondary battery includes an electrode assembly including a positive electrode, a negative electrode, a first separator disposed on one side of the surface of the negative electrode and having a thickness T1, and a second separator disposed on the other side of the surface of the negative electrode and having a thickness T2. The thickness T2 of the second separator is larger than the thickness T1 of the first separator. The first separator includes a first porous film having a porosity P1, and the second separator includes a second porous film having a porosity P2. At least one of the first separator and the second separator includes a heat resistant layer. The positive electrode, the first separator, the negative electrode and the second separator are wound together such that the first separator is arranged on the outer side and the second separator is arranged on the inner side.

Secondary batteries

Deterioration of the degree of vacuum in a vacuum chamber is prevented while securing adequate cooling performance by gas cooling. A substrateis provided in a vacuum, and the cooling bodyis provided close to a film non-formation surface of the substrate. A thin film is formed by depositing a film forming material on a film formation surface of the substratewhile introducing a cooling gas into between the substrateand the cooling body. At this time, a gas which reacts with the film forming material is introduced as the cooling gas.

Method for forming thin film while providing cooling gas to rear surface of substrate

To accelerate a film formation rate in forming a negative electrode active material film by vapor deposition using an evaporation source containing Si as a principal component, and to provide an electrode for lithium batteries which is superior in productivity, and keeps the charge and discharge capacity at high level are contemplated. The method of manufacturing an electrode for lithium batteries of the present invention includes the steps of: providing an evaporation source containing Si and Fe to give a molar ratio of Fe/(Si+Fe) being no less than 0.0005 and no greater than 0.15; and vapor deposition by melting the evaporation source and permitting evaporation to allow for vapor deposition on a collector directly or through an underlying layer. The electrode for lithium batteries of the present invention includes a collector, and a negative electrode active material film which includes SiFeO(wherein, 0&#x3c;x&#x3c;2, and 0.0001&#x2266;y/(1+y)&#x2266;0.03) and is laminated on the collector directly or through an underlying layer.

Electrode for lithium batteries and method of manufacturing electrode for lithium batteries

A first counter electrode and a second counter electrode, for electrically coupling a first piezoelectric element unit and a second piezoelectric element unit, for composing a thin film piezoelectric element are common floating electrodes. A first principal electrode film and a second principal electrode film of each piezoelectric element unit are connected, and a voltage is applied between the two piezoelectric element units. As a result, by the wiring of two terminals only without using grounding electrode wiring, the first piezoelectric element unit and second piezoelectric element unit can be driven, so that the wiring process may be substantially simplified.

Thin film piezoelectric element; actuator, head support mechanism, and disc recording and reproducing device using the thin film piezoelectric element; and method of manufacturing the thin film piezoelectric element

A thin film piezoelectric element including a first structure having a sequential stack of layers, a first main electrode layer, a first opposed electrode layer and a first piezoelectric thin film having a first polarizing direction located between the first electrode layers, a second structure having as a sequential stack of layers, a second main electrode layer, a second opposed electrode layer and a second piezoelectric thin film having a second polarizing direction located between the second electrode layers, an insulating resin layer covering peripheral portions of the first and second structures, and at least one connecting electrode pad located at a side of one of the first and second structures, for connecting the main electrode layer and the opposed electrode layer of the structures to external equipment, wherein each first and second structures has a cross-sectional shape such that the piezoelectric thin film is tapered, diminishing in width, from a portion near the main electrode layer to a portion near the opposed electrode layer, and the first and second opposed electrode layers of adjacent structures are bonded to each other, and each polarizing direction of the piezoelectric thin films is identical to the direction of each opposed electrode layer.

Thin film piezoelectric element

A method of manufacturing a thin film piezoelectric element, wherein main electrode layer, piezoelectric thin film, and opposed electrode layer respectively having specified shapes are first formed on first substrate and second substrate, and after that, the opposed electrodes are opposed and bonded to each other, and insulating resin layer is formed over the peripheral portion thereof, and then the second substrate is removed, the insulating resin layer is etched, and connecting electrode pad is formed, and finally, the first substrate is removed to obtain a completely separated thin film piezoelectric element. By this method, it is possible to improve the reproducibility of shapes and to prevent trouble such as shorting between the electrodes which hold the piezoelectric thin film, thereby making it possible to provide a thin film piezoelectric element that may assure high yield without variation in piezoelectric characteristics, and its manufacturing method.

Method of manufacturing a thin film piezoelectric element

A piezoelectric driving device of the present invention prevents a short circuit from occurring between electrode metallic films even if bonding-wire is performed. The piezoelectric driving device is a piezoelectric driving device in which a piezoelectric thin plate is joined to one side of a substrate, and a terminal electrode for applying a signal for expanding or contracting the piezoelectric thin plate is further formed on the plane. The terminal electrode is formed on one side of the substrate via a piezoelectric-member pedestal separated from the piezoelectric thin plate.

Piezoelectric driving device

A fastening device includes a cylindrical shell with an opening extending over the entire length of the cylindrical shell, a gripping member formed on the periphery of the cylindrical shell by extending outward and a pair of hooks linked with the tip end of the cylindrical shell via hinges. A fastening method using the foregoing fastening device includes the steps of passing the pair of hooks through a hole for fastening of a packing box formed of an upper box and a lower box, having the pair of hooks opened outward to bring the holding members thereof into contact with the back side surface of the packing box and at the same time having the pair of hooks engaged with each other firmly. At this time, the gripping member is in contact with the front side surface of the packing box. Accordingly, both surfaces located at each respective rim of the hole for fastening are sandwiched between the pair of hooks and the gripping member. Furthermore, the fastening device is structured to make the position of engagement between the pair of hooks changeable, thereby allowing the angle of each respective hook against the cylindrical shell to change and allowing consequently the sandwiching distance between the gripping member and the pair of hooks to change.

Growing community of inventors

Osaka, Japan

Yuko Ogawa