Taiyo Yuden Co., Ltd.

Naoto Hagiwara

Katsuei Ishida

Kazushi Yawata

Kyotaro Mano

Motoki Kobayashi

Takatoshi Nagase

Kyotaro Goto

Yuki Kawai

Tomofumi Akiba

Satoshi Nagura

Tomohiro Taguchi

Toshiya Terui

Shin Nakagawa

One object is to provide an electric storage element for electrochemical devices that can prevent fall of active material powder from an outer edge of an active material layer, thereby preventing functional disorders due to the fall of the active material powder. In accordance with one aspect, an electric storage element has laminated structure wherein active material layers (first active material layer and second active material layer) are placed between an ion permeable layer and a first collector layer and between the ion permeable layer and a second collector layer. The active material layers have a smaller outline than the ion permeable layer and are tightly enclosed with insulating layers (first insulating layer and second insulating layer) filling the respective ambient regions corresponding to the difference in outlines from the ion permeable layer.

Storage element for an electrochemical device, electrochemical device using said storage element, method for manufacturing storage element for electrochemical device, and method for manufacturing electrochemical device

An electrode for an electrochemical device includes a current collector, electrode layer, and active material layer. The electrode layer is formed on the current collector and contains an active material. The active material layer is formed in an area on the current collector where the electrode layer is not formed, and contains an active material. The electrode is capable of reducing the leak current while improving the device reliability.

Electrode for electrochemical device, electrochemical device, and method for manufacturing electrode for electrochemical device

An electrochemical device is provided with an electric storage element that is constituted by a first electrode sheet, a second electrode sheet, and a separator sheet installed between the two electrode sheets. The separator sheet includes: a first part (high liquid absorptivity part) sandwiched between the two electrode sheets; a second part (low liquid absorptivity part) extending outward from the two electrode sheets; and a third part (contact part) in contact with a rim surface of the second electrode sheet, whereby the electrochemical device can quickly and reliably resolve a phenomenon of the amount of electrolyte decreasing in the part of the separator sheet sandwiched between the two electrode sheets, even if the phenomenon occurs frequently.

Electrochemical device

An electrochemical device has a lid, case, electric storage element, electrolyte, and conductive bonding material layer. The case has a via hole and forms a solution chamber between itself and the lid. The electric storage element is accommodated in the solution chamber. The electrolyte is accommodated in the solution chamber. The wiring has a via hole part provided in the via hole and connects the interior and exterior of the solution chamber. The conductive bonding material layer fixes the electric storage element onto the case while electrically connecting the electric storage element and via hole part, where the conductive bonding material layer has a contact area that contacts the case and non-contact area that does not contact the case and the non-contact area is formed in a manner surrounding the via hole.

Electrochemical device having electric storage element and electroye sealed in insulating case

An electrode for an electrochemical device includes a current collector and an electrode layer. The current collector has a main face and a side face. The side face has a concave-convex shape whose convex part is constituted by a projection extending along the main face. The projection is formed along a periphery of the electrode layer, forming a support portion. The electrode layer contains active material and is formed on and in contact with the main face including a surface formed by the support portion. The electrode is capable of mitigating the concentration of current at the edges of the electrode layer.

[Object] To provide an electrochemical device that permits a thin package, as well as securely prevents an electrolyte or gas in an internal space from leaking outside even when temperature rise occurs in the electrochemical device during the process where the electrochemical device is reflow soldered to a circuit board or encapsulated into an IC card. [Solution] In the electrochemical device RB, the main body of the package PA includes first cover plate, first terminal plate, frame plate, second terminal plate, and second cover platestacked in this order and bonded at the facing surfaces. The electric storage element SD is encapsulated in internal space IS formed, between the cover plates, by the through holesin the frame sectionsof the terminal platesand the through holein the frame plate

One of the objects of the present invention is to provide a separator for an electrochemical device, capable of suppressing an increase in a resistance value of a storage element. In accordance with one aspect of the present invention, a separatorfor an electrochemical device is formed such that plural high porosity portionsfrom an upper surface to a lower surface in a thickness direction thereof and plural low porosity portionsfrom the upper surface to the lower surface in the thickness direction thereof are arranged in a region which is interposed between a positive electrodeand a negative electrode

Electrochemical device and a separator for electrochemical device

Disclosed is an electrochemical capacitor that can be reflow soldered, and wherein film package is used on the capacitor body. The container () of the electrochemical capacitor (ECC) stores the film package () of the capacitor body () within a storage space (SR) such that sealing sections (-) do not contact the inner surface of the storage space (SR). Inner material (), which cover the sealing sections (-) and rear edge of the film packageand are adhered to the inner surface of the storage space (SR), affixing the film package () within the storage space (SR), are provided in a rectangular framework to the regions in the storage space (SR) of the container () that correspond to said sealing sections (-) and rear edge.

Electrochemical capacitor

Provided is an electrochemical device which is capable of suppressing problems affecting the capacitor element as a whole, such as a drop in its voltage resistance characteristics and shortening of its life. The capacitor element () is constituted of a laminate formed by superposition of a first electrode sheet (), a separation sheet (), a second electrode sheet (), a separation sheet (), and a third electrode sheet () in the named order from the bottom, and folding the laminate along a reference line VSL to double the laminate. In the resulting folded laminate, a collector electrode layer () and polarizable electrode layer () of the first electrode sheet (), the collector electrode layer () and polarizable electrode layer () of the second electrode sheet (), the collector electrode () and polarizable electrode layer () of the third electrode sheet (), and the two separation sheets () are connected to each other at the respective folded locations.

Provide an electrochemical device offering a large capacity per current collector and a low internal resistance, which is also easy to assemble. Provided is a laminated sheet bodyS by inserting a negative-electrode continuous bodyBW between an adjacent pair of first current collectorswith their first current collector main unitsconnected together, and also between an adjacent pair of first current collectors,with their first tabsconnected together, with respect to a plurality of positive electrodesA arranged in the width direction apart from each other, after which the negative-electrode continuous body of the laminated sheet body is cut to the unit width dimension of an element to obtain a plurality of laminated bodies

Electrochemical device and manufacturing method thereof

An electrochemical device is disclosed. The device comprises a casing having a recess with an opening on a top face of the recess, a lid configured to block the recess of the casing so that the recess is watertight and airtight, a rechargeable and dischargeable storage element and an electrolytic solution enclosed in the recess, and a separate sheet interposed between the first and second electrode sheets, the separate sheet having a higher liquid absorption section interposed between the first and second electrode sheets, and a lower liquid absorption section continuously connected to the higher liquid absorption section, having a liquid absorption smaller than that of the higher liquid absorption section and extending outwardly with respect to the first and second electrode sheets. The lower liquid absorption section has a thickness greater than that of the higher liquid absorption section.

Provided is an electrochemical device which is compatible with high-temperature reflow soldering using lead-free solder. An electric double-layer capacitor-has a structure in which a positive terminaland a negative terminalare led out of a packagewhere an electric storage elementis sealed. The entire packageand the bases of led-out portions of the positive terminaland the negative terminalare covered by a thermal insulation material layerhaving a thermal conductivity lower than that of the package

Electrochemical device and packaging structure thereof

An electrochemical device includes a container, a storage element, and a structure. The container includes a container main body including a first inner surface, and a lid including a second inner surface that is opposed to the first inner surface, the lid being joined to the container main body. The storage element includes a first electrode layer that is bonded to the first inner surface, a second electrode layer that is bonded to the second inner surface, and a separator that is provided between the first electrode layer and the second electrode layer, the storage element being sandwiched between the first inner surface and the second inner surface. The structure is provided to at least one of the first inner surface and the second inner surface, at least partially embedded in an inside of at least one of the first electrode layer and the second electrode layer, and made of a cured conductive adhesive.

There is provided an electrochemical capacitor including a lid; a case having a via, and forming a liquid chamber together with the lid; an electric storage element housed in the liquid chamber; an electrolyte housed in the liquid chamber; a wiring having a via part arranged within the via, and connecting an inside to an outside of the liquid chamber; an extraction electrode connected to the via part; an overcoating layer for coating the extraction electrode, and having an opening to expose a partial region of the extraction electrode; and a conductive adhesive layer for fixing the electric storage element to the overcoating layer, and electrically connecting the electric storage element to the extraction electrode through the opening.

A containerof a surface mounting electrochemical device according to an embodiment of the invention comprises a first metal componenthaving a recess, a second metal componentdirectly welded to the first metal componentto close the opening of the recessa. A first electrodeof an electric storage elementis electrically insulated from the container, and a second electrodeelectrically conducts thereto. A first terminalis electrically insulated from the containerand electrically conducts to the first electrodeof the electric storage elementvia a relaying element. A second terminalelectrically conducts to the containerand the second electrodeof the electric storage elementvia the container

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Takasaki, Japan

Naoto Hagiwara