Sumitomo Electric Industries, Limited

Fujitsu Corporation

The Kansai Electric Power Co., Inc.

Takashi Kanno

Takefumi Ito

Hayato Fujita

Masahiro Kuwabara

Hideyuki Yamaguchi

Kousuke Shiraki

Kiyoaki Hayashi

Takeshi Yamana

Kenji Motoi

Katsuya Yamanishi

Kiyoaki Moriuchi

Toshihiro Suzuki

Tetsuya Hamada

Hisashi Yamaguchi

Tetsuya Kobayashi

Haruhisa Toyoda

Noriyuki Ohashi

Hiroyuki Nakaishi

Nobuyuki Tokuda

Toshio Shigematsu

Seiji Ogino

Kenichiro Miyatake

Takeshi Goto

Ryo Sato

Yoshinori Tanaka

Yuichi Sato

Tsutomu Takahashi

Kenichi Ito

Hideki Zenitani

Kei Hanafusa

Masaru Ishiwa

Hiroshi Yamaji

Akio Takayasu

Akira Oka

Souichirou Okumura

Yuta Ochi

Riichi Magome

Tsutomu Nagakari

Tomoyuki Hongho

Makoto Goshima

Shinji Oguro

Kouji Mizushima

Ituo Okamoto

Kosuke Shiraki

A bipolar plate faces an electrode of a redox flow battery and includes an introduction channel and a discharge channel of an electrolyte. One of the introduction channel and the discharge channel is a groove-like flow channel that is formed in a surface of the bipolar plate, and the other of the introduction channel and the discharge channel is a pipe-like flow channel that is formed in an inside of the bipolar plate. The bipolar plate includes a communication hole that communicates with the pipe-like flow channel from the surface.

Bipolar plate, cell frame, cell stack, and redox flow battery

A cell stack including; a stacked body including a plurality of cell frames each having a bipolar plate whose outer periphery is supported by a frame member; and a pair of end plates that tighten the stacked body from both sides of a stacking direction thereof, wherein an area S [cm] of each cell frame as viewed from the stacking direction of the stacked body and a length W [mm] in the stacking direction of the stacked body satisfies a relationship 0.05&#x2264;W/S&#x2264;0.9.

Cell stack and redox flow battery

A redox flow battery includes: a membrane; and electrodes that are disposed in a compressed state on both sides of the membrane and sandwich the membrane. The thickness x (&#x3bc;m) of the membrane and the compression ratio y (%) of the electrodes satisfy the following relation A or B: (A) when the electrodes are formed from carbon felt, y&#x3c;x+60, 30&#x2264;y&#x2264;85, and 5&#x2264;x&#x2264;60 hold; (B) when the electrodes are formed from carbon cloth or carbon paper, y&#x3c;1.2x+42, 10&#x2264;y&#x2264;85, and 5&#x2264;x&#x2264;60 hold, where y={1&#x2212;(the thickness during compression/the thickness before compression)}&#xd7;100.

Redox flow battery

A redox flow battery cell includes: an electrode to which an electrolyte solution is supplied; and a bipolar plate with which the electrode is arranged, wherein the bipolar plate has at least one groove portion through which the electrolyte solution flows, on a face on the electrode side, the electrode is made of a carbon fiber aggregate containing carbon fibers, and has a buried portion that is pressed toward the bipolar plate side and buried into the groove portion, and an amount of burial of the buried portion is not less than 0.2 mm and not more than 1.4 mm.

Redox flow battery cell and redox flow battery

Provided is a redox flow battery in which damage is unlikely to occur in a membrane. A redox flow battery includes a pair of adjacent cell frames, each cell frame including a frame body in which a flow channel for an electrolyte is formed, and a bipolar plate disposed inside the frame body; a positive electrode and a negative electrode disposed so as to face each other between the bipolar plates of the pair of cell frames; a membrane interposed between the positive electrode and the negative electrode; a protection plate which covers the flow channel and presses edge portions of the positive electrode or the negative electrode toward the bipolar plate; and a membrane protection structure which prevents the membrane from being broken by contact between the protection plate and the membrane.

The battery cell for a flow battery includes a cell frame including a frame including a through-window and a manifold serving as an electrolyte flow path, and a bipolar plate blocking the through-window; a positive electrode disposed on one surface side of the bipolar plate; and a negative electrode disposed on another surface side of the bipolar plate. In this battery cell, in the frame, a thickness of a portion in which the manifold is formed is defined as Ft; in the bipolar plate, a thickness of a portion blocking the through-window is defined as Bt; in the positive electrode, a thickness of a portion facing the bipolar plate is defined as Pt; in the negative electrode, a thickness of a portion facing the bipolar plate is defined as Nt; and these thicknesses satisfy Ft&#x2265;4 mm, Bt&#x2265;Ft&#x2212;3.0 mm, Pt&#x2264;1.5 mm, and Nt&#x2264;1.5 mm.

Cell frame and redox flow battery

A redox flow battery includes a cell frame having a frame body in which a sealing groove is formed and a sealing member disposed in the sealing groove. The redox flow battery includes an adhesive that fixes the sealing member to the sealing groove, and a type A durometer hardness of the adhesive after curing is 100 or less. Preferably, the type A durometer hardness of the adhesive after curing is less than or equal to a type A durometer hardness of the sealing member.

An electrode for redox flow batteries, the electrode being formed of a carbon fiber aggregate including a plurality of carbon fibers. Each of the carbon fibers has a plurality of pleats formed in the surface thereof. The ratio of Lto L, that is, L/L, is more than 1, where Lis the peripheral length of a cross section of the carbon fibers and Lis the peripheral length of a virtual rectangle circumscribing the cross section of the carbon fibers.

Electrode for redox flow batteries, redox flow battery cell, and redox flow battery

An electrode for redox flow battery is disposed opposite a membrane of a redox flow battery. The electrode includes a fiber assembly including a plurality of carbon fibers. The fiber assembly includes soft carbon fibers with a Young's modulus of 200 GPa or less. An average carbon fiber diameter of the soft carbon fibers is preferably 20 &#x3bc;m or less.

Electrode for redox flow battery, and redox flow battery

A cell frame includes a bipolar plate in contact with an electrode constituting a battery cell; and a frame body surrounding a periphery of the bipolar plate, wherein the frame body includes a liquid supply manifold through which an electrolyte is supplied into the battery cell, the bipolar plate includes, in a surface facing the electrode, a plurality of main groove portions that are arranged adjacent to one another and through which the electrolyte flows, at least one of the frame body and the bipolar plate includes a supply flow directing portion configured to distribute, in a direction in which the main groove portions are arranged adjacent to one another, the electrolyte supplied through the liquid supply manifold, to supply the electrolyte to each of the main groove portions, and each of widths Wi of electrolyte inlets of the main groove portions, and a width Wr of the supply flow directing portion in a direction orthogonal to the direction in which the main groove portions are arranged adjacent to one another, satisfy a width ratio Wr/Wi of 1.5 or more and 10 or less.

Cell frame, cell stack, and redox flow battery

A redox flow battery cell includes a positive electrode, a negative electrode, and a membrane interposed between the positive electrode and the negative electrode. The positive electrode and the negative electrode have an overlapping region where the positive electrode and the negative electrode overlap each other with the membrane therebetween, and at least one of the positive electrode and the negative electrode has a non-overlapping region where the positive electrode and the negative electrode do not overlap each other with the membrane therebetween. The total area of the non-overlapping region is 0.1% to 20% of the area of the overlapping region.

Redox flow battery cell, redox flow battery cell stack, and redox flow battery

A bipolar plate is a bipolar plate for a battery, the bipolar plate having a positive electrode disposed on a first surface side thereof and a negative electrode disposed on a second surface side thereof, wherein at least one of the first surface and the second surface is provided with a flow path through which an electrolyte flows. The flow path includes an introduction port for the electrolyte, a discharge port for the electrolyte, and a groove section which is located between the introduction port and the discharge port and guides the electrolyte to a predetermined route. The groove section includes a plurality of vertical groove sections which extend in a vertical direction and are arranged in parallel in a direction orthogonal to the vertical direction when the bipolar plate is placed at a predetermined position in the battery.

Bipolar plate, cell frame, cell stack and redox-flow battery

Provided are a battery cell that can be produced efficiently. A frame body of each cell frame of a battery cell includes an inner peripheral recessed portion formed by reducing a thickness of a peripheral portion that surrounds an entire perimeter of the penetrating window so that the peripheral portion has a smaller thickness than other portions of the frame body. A bipolar plate of the battery cell includes an outer peripheral engaging portion that engages with the inner peripheral recessed portion, the outer peripheral engaging portion being a portion having a particular width and extending throughout an entire outer periphery of the bipolar plate. The battery cell includes a disrupting structure that disrupts a leak channel that serves as an escape route for the electrolyte, the leak channel causing the inlet slit and the outlet slit to be in communication with each other and being formed between an outer periphery of the inner peripheral recessed portion and an outer periphery of the outer peripheral engaging portion when the cell frames are viewed from front.

Battery cell and redox flow battery

A frame body for a cell frame of a redox flow battery, the frame body including an outer peripheral portion, the outer peripheral portion including a thin region whose thickness gradually decreases in a direction from the center of the frame body toward the outer periphery of the frame body.

Frame body, cell frame, cell stack, and redox flow battery

There is provided a frame body used for a cell of a redox flow battery, that can improve heat dissipation of an electrolyte in a slit and can suppress rise of the temperature of the electrolyte. It is a frame body used for a cell of a redox flow battery, comprising: an opening formed inside the frame body; a manifold allowing an electrolyte to pass therethrough; and a slit which connects the manifold and the opening and forms a channel of the electrolyte between the manifold and the opening, the slit having a pair of sidewalls facing each other in a cross section orthogonal to a direction in which the electrolyte flows, the slit having, at at least a portion thereof in the slit's depthwise direction, a width narrowing portion allowing the sidewalls to have a spacing narrowed in the depthwise direction.

Frame body, cell frame for redox flow battery, and redox flow battery

Growing community of inventors

Osaka, Japan

Takashi Kanno