Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Other

Makiko Kise

Shigeru Aihara

Daigo Takemura

Hisashi Shiota

Hiroaki Urushibata

Jun Aragane

Takashi Nishimura

Shoji Yoshioka

Syoji Yoshioka

Yasuhiro Yoshida

Kenro Mitsuda

Kouji Hamano

Osamu Hiroi

Hisashi Tsukamoto

Kenji Kawaguchi

Michio Murai

Masaharu Moriyasu

Hideo Ichimura

Hideo Horibe

Shinji Nakadeguchi

Hironori Ozaki

Sadayuki Inoue

Shuichi Matsumoto

Hiroshi Adachi

Satoshi Hara

Tatsunori Okada

Masaru Shinozaki

Tomoki Takegami

Kazufumi Tanaka

Hironori Kuriki

Sei Tsunoda

Toshio Shinoki

Shinsuke Miki

Hiroto Nishiguchi

Takahito Ida

Junichi Nakazono

Nozomi Kasahara

Keijun Kasajima

A fuel cell system includes: a reformer which generates a reformed gas containing hydrogen by reacting hydrocarbon and moisture with each other; a fuel cell stack which generates electric energy through electrochemical reaction of the reformed gas and an oxidant; an ejector which, using steam as a drive fluid, sucks either a raw fuel containing the hydrocarbon or a recycled gas recovered from an anode exhaust gas, and supplies a resultant gas to the reformer; and a vaporizer which generates the steam by vaporizing water, wherein an operation temperature of the fuel cell stack is higher than a boiling point of water at an operation pressure, and the vaporizer generates the steam through heat exchange with the anode exhaust gas.

Fuel cell system

The present invention provides a storage-battery control devicecapable of enhancing economical efficiency by controlling charge state of a storage batteryso that surplus power generated by photovoltaic generation can be entirely charged into the storage batteryeven in a case where power cannot be sold to a system power supply. A storage-battery control deviceaccording to the present invention includes a load-power prediction deviceto predict load power, a PV-power prediction deviceto predict generated power by photovoltaic power generation, and a system controllerto obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segmenthaving a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, to control the charge state of a storage batteryat the start point so that the predicted charge amount can be charged in the prediction segment, wherein an end point of the prediction segmentis a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching the maximum value of the generated power.

Storage-battery control device, storage-battery charge/discharge system, photovoltaic power generation system, and storage-battery control method

When a plurality of storage batteries is used by connecting them in parallel, since the progress of degradation differs among the storage batteries, a power conversion system includes a degradation information acquisition device for acquiring the degradation information of the storage batteries, a temperature information acquisition device for detecting the temperature information of the storage batteries, and a control device for controlling the storage battery power converter based on the degradation information of the storage batteries by the degradation information acquisition device and the temperature information of the storage batteries by the temperature information acquisition device so that the degradation states of the plurality of the storage batteries can be matched.

Power conversion system

A life prediction apparatus for an electrical storage device, which has a life predictor, includes: an operation controller for life prediction that controls operation of the electrical storage device; a data collector that collects measurement data with respect to a plurality of operation conditions and calculates and successively accumulates evaluation characteristics; a data analyzer that creates a regression formula representing a relationship between the evaluation characteristic and an operation time by curve fitting, with an appropriate approximation function, the accumulated evaluation characteristic data; and a life prediction formula creator that creates a life prediction formula for calculating a predicted value of the evaluation characteristic under random operation conditions on the basis of the regression formula.

Life prediction apparatus for electrical storage device and life prediction method for electrical storage device

A power storage device cell is configured such that a capacitor positive electrode and a lithium positive electrode are directly connected with each other; a second electrode layer is formed of a material including particles of phosphoric-acid-type lithium compound having an olivine-type structure; the third electrode layers are formed mainly of particles of lithium titanate; and a third collector foil is formed of an aluminum foil.

Power storage device cell, manufacturing method and storing method therefor, and electric storage device

A power storage device cell is configured to include a capacitor positive electrode, a lithium positive electrode, and a common negative electrode in which electrode layers are formed on a collector foil in which penetration holes are formed, and such that the capacitor positive electrode and the lithium positive electrode are directly connected; each of the electrode layers of the common negative electrode is formed of a carbon-based material in which graphite particles and hard carbon particles are mixed, and the proportion of the hard carbon particles in the carbon-based material is from 5% by weight to 70% by weight.

Power storage device cell, manufacturing method therefor, and electric storage device

Provided is an energy storage device cell capable of enhancing energy density. The energy storage device cell includes: a battery main body including battery anode plate members and battery cathode plate members, in which the battery cathode plate members are placed at both ends in a stack direction; common anode plate members each including a common anode collector foil having a through-hole formed therein and common anode electrode layers, the common anode plate members being stacked on the battery cathode plate members placed at both ends in the stack direction of the battery main body; capacitor cathode plate members each including a capacitor cathode collector foil and a capacitor cathode electrode layer, in which the capacitor cathode electrode layer is placed between the common anode plate member and the capacitor cathode collector foil.

Energy storage device cell

A cathode terminal includes a cathode collector foil connector connected to the blank of a cathode collector foil, a cathode terminal external lead-out portion, and an intra-cell cathode terminal radiator located between the cathode collector foil connector and the cathode terminal external lead-out portion and covering approximately half of one of the wide side surfaces of a flat-wound electrode portion. An anode terminal includes an anode collector foil connector connected to the blank of an anode collector foil, an anode terminal external lead-out portion, and an in-cell anode terminal radiator located between the anode collector foil connector and the anode terminal external lead-out portion and substantially covering a remaining portion of the one of the wider side surfaces of the flat-wound electrode portion.

Flat-wound electricity storage device cell and flat-wound electricity storage device module

Conventional batteries have the problem that, when battery temperature rises above a temperature at which the separator melts and flows due to an internal short-circuit, a large short-circuit current is generated between the positive and negative electrodes, that further raises the battery temperature. As a result, the short-circuit current further increases. The inventive electrode increases its resistivity with increasing temperature, and a processing for producing the electrode is disclosed. The electrode of the invention has an electron conductive material containing a conductive filler and a resin and increases its resistivity with increasing temperature.

Process for producing an electrode with positive temperature coefficient (PTC) function

The battery of the present invention comprises the electrode which contains the pre-determined amount of electronically conductive material at which resistance increases in accordance with temperature rise and conductive agent; the electrode wherein the ratio of the total amount of the electronically conductive material and the conductive agent to the active material is set to a pre-determined value; and the electrode wherein the average particle size of the conductive agent based on the average particle size of the electronically conductive material is in a pre-determined range. The coducitive material contains an electrically conductive filler and a crystalline resin. The conductive material and the coductive agent are contacted with the active material. A significant reduction in short circuit current is achieved over a defined range of conductive agent particle size.

Battery and electrode including an active material, an electrically conductive material and a conducting agent

Conventional batteries have a problem that, in case the battery temperature should rise to 100&deg; C. or higher due to an internal short-circuit, etc., a large short-circuit current develops to generate heat. It follows that the battery temperature further increases, which can result in a further increase of the short-circuit current. Further, some of electrode structures involve reduction in discharge capacity. These problems are solved by a battery in which an electron conductive material ( ), being in contact with an active material ( ) in an electrode, comprises a conductive filler and a resin so that the electrode may increase its resistivity with a temperature rise, and the ratio of the particle size of the electron conductive material ( ) to that of the active material ( ) is in a range of from 0.1 to 20.

Cell and method of producing the same

A conventional battery has a problem that a large short-circuit current was generated with temperature rise due to internal short-circuit or the like, and therefore, the temperature of the battery further increases due to exothermic reaction to increase the short-circuit current. The present invention has been carried out in order to solve the above problems. The battery of the present invention is a battery wherein at least one of a positive electrode and a negative electrode comprises an active material layer containing an active material and an electronically conductive material contacted to the active material , wherein a solid electrolytic layer is interposed between the above positive electrode and the negative electrode , and wherein the above electronically conductive material comprises an electrically conductive filler and a resin so that resistance increases with temperature rise.

Battery and process for preparing the same

The object of the present invention is to obtain an electrode whose resistivity increases with temperature, and a battery using the same. Specifically, the invention consists in limiting the proportion of a conductive filler contained in electron conductive particles of an electron conductive particle layer to a range of from 55 to 70 parts by weight. A battery constituted by using the electrode has an increased discharge capacity and is capable of reducing a short-circuit current.

Electrode having PTC function and battery comprising the electrode

A battery with an active material layer having an active material an electronically conductive material contacted to the active material and an electrolytic layer jointed with the active material layer wherein the electronically conductive material comprises an electrically conductive filler and a resin having a predetermined thermal melting temperature T and has a Positive Temperature Coefficient (PTC) such that resistance of the electrically conductive material increases with temperature, and wherein the active material layer and the electrolytic layer are laminated and are jointed together by heating the resin to a predetermined thermal treatment temperature T

A battery body, which is composed of a laminated body obtained by laminating a cathode and an anode via a separator or a wound body obtained by winding them in a laminated structure and a plurality of leads connected to the cathode and the anode, is contained in a flexible package, and after an electrolyte solution is injected thereinto, an opening of the package is sealed at pressure which is lower than atmospheric pressure and is reduced to not less than vapor pressure of the electrolyte solution so that a thin battery is fabricated. A rise in pressure in the battery due to generation of gas in the battery and volume expansion of the gas can be restrained when the battery is maintained at high temperature.

Growing community of inventors

Tokyo, Japan

Makiko Kise