Murata Manufacturing Co., Ltd.

Kouichi Watanabe

Masanori Endo

Tatsuo Kunishi

Masato Higuchi

Michihiro Murata

Yoshiaki Heinouchi

Michinobu Maesaka

Shunjiro Imagawa

Kunio Nishida

Hiroyuki Mukouyama

Kouichi Tanaka

A plurality of flat power supply elements, each having a flat case for serving as an element terminal and an electrode plate arranged in the case in a close contact manner through an insulating layer for serving as another element terminal. An opening formed in the case for partially exposing the electrode plate. The flat power supply elements are bonded onto a flexible circuit board by an insulating bonding layer. A first external connection terminal which is provided on the circuit board is connected to the electrode plate of one power supply element through a first conductive member. A connecting conductor which is also provided on the circuit board is electrically connected to the case of this one power supply element through a second conductive member and connected to the electrode plate of another power supply element through a third conductive member. A second external connection terminal which is provided on the circuit board is electrically connected to the case of this another power supply element through a fourth conductive member. Thus, a plurality of flat power supply elements having excellent sealing structures are combined with each other to provide an integrated thin power supply unit with no increase in thickness.

Thin power supply unit

A method of fabricating a flat type electrochemical device, which is constructed by placing in a case comprising first and second case half bodies a separator and first and second functional substances for an electrochemical device so arranged as to interpose the separator. Peripheral portions of the first and second case half bodies are overlapped with each other, the peripheral portions are welded by a welding process during the application of pressure whereby the peripheral portions are joined with substantially no gaps. The portions welded by the welding process with pressure are then further welded using a laser beam welding.

Method of fabricating flat type electrochemical device

One method of manufacturing a polarizable electrode for an electric double-layer capacitor includes, in order, the steps of: preforming a kneaded substance of fine carbon powder, a polymer resin containing fluorine, and a liquid lubricant into a sheet-type preform; adjusting the content of the liquid lubricant in the sheet-type preform to 10 to 47 percent by weight; shaping the preform into a prescribed thickness, optionally but advantageously with heated rolls; and then substantially removing the liquid lubricant from the preform. In another disclosed method, first the liquid lubricant is substantially removed, and then the sheet-type preform is rolled with rollers that are heated to substantially 90.degree.-120.degree. C. In either of the above methods, the rollers are controlled to have a circumferential speed of 0.7-5 m/min and the rollers shape the preform into a sheet substantially 0.04 to 0.5 mm in thickness for serving as a polarizable electrode.

Method of manufacturing polarizable electrode for electric double-layer

A stacked electric double layer capacitor including a peripheral portion of an intermediate electrode plate held between peripheral portions of first and second case halves to be welded to each other, thereby defining first and second closed spaces for storing first and second capacitor elements, respectively. The first and second electrode plates are exposed by openings provided in the first and second case halves to form external terminal means, respectively. The two capacitor elements, stacked in series with each other are stored in the case, formed by joining the case halves to form a stacked electric double layer capacitor which can be reduced in thickness with substantially no leakage of electrolyte.

Stacked electric double layer capacitor

An electric double layer capacitor utilizing an electric double layer which is formed at the interface between activated carbon electrodes and electrolyte included in polarizable electrodes, wherein the activated carbon electrodes are formed of polyacrylonitrile based activated carbon whose nitrogen content is not more than 7 wt %.

Electric double layer capacitor

An electric double layer capacitor utilizing an electric double layer formed at the interface between activated carbon electrodes and electrolyte included in polarizable electrodes, wherein the activated carbon electrodes are made from activated carbon which is produced by subjecting a synthetic resin, such as polyacrylonitrile or cellulose, to flame resisting treatment and activating treatment and which contains a Ti compound whose amount is not more than 0.2 wt % in terms of Ti.

An electric double-layer capacitor includes one or a group of electric double-layer capacitor element(s), an electrode structural member comprising of electrode plates and an insulating plate, stacked on the electric double-layer capacitor element(s), and a case for enclosing the electric double-layer capacitor element(s) and the electrode structural member. The case has a shelf-like stepped portion in the inner peripheral surface of its side wall. The shelf-like stepped portion and the side wall of the case are in close contact with the peripheral edge portion of the insulating plate, in order to airtightly seal the case and the insulating plate. Each electrode plate has an electrode terminal outwardly extending from the opening end portion of the case.

Electric double-layer capacitor

An electric double-layer capacitor has at least one or two elements. Each element includes a charge storage part, a pair of collectors arranged to hold the charge storage part, and a gasket enclosing the charge storage part and being arranged between the collectors to be thermally adhered to the collectors. Each collector is formed from a conductive polyethylene sheet which is provided with conductivity by a carbon material and has a multi-layer structure including polyethylene materials of different density levels.

Growing community of inventors

Kyoto, Japan

Kouichi Watanabe