Sumitomo Electric Industries, Limited

Hideyuki Yamaguchi

Takashi Kanno

Hayato Fujita

Masahiro Kuwabara

Takefumi Ito

Kiyoaki Hayashi

Kousuke Shiraki

Kiyoaki Moriuchi

Katsuya Yamanishi

Haruhisa Toyoda

Takeshi Yamana

Kenji Motoi

Seiji Ogino

Kosuke Shiraki

Provided is a method for operating a redox flow battery, the method including a step of mixing a predetermined volume of a positive electrolyte and a predetermined volume of a negative electrolyte at a predetermined period, in which the predetermined period is time x selected from a range of 320 hours or less, the predetermined volume is y % of a storage volume set for one of a positive electrolyte tank and a negative electrolyte tank, y is equal to or higher than a value represented by y=0.01%&#xd7;x, when x is selected from a range of 30 hours or less, y is equal to or lower than a value represented by y=0.9%&#xd7;x, and when x is selected from a range of more than 30 hours to 320 hours, y is 27.0% or less.

Method for operating 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.

Redox flow battery

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.

A redox flow battery includes an electrode, a cell frame including a frame body and a bipolar plate and having a fitting recess in which the electrode is fitted, and a membrane disposed so as to sandwich the electrode between the bipolar plate and the membrane. In the redox flow battery, a gap between, among outer peripheral edge surfaces of the electrode, a side edge surface parallel to a direction in which an electrolyte flows and an inner wall surface of the fitting recess, the inner wall surface facing the side edge surface, is 0.1 mm or more and 12 mm or less.

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

A cell frame for a redox flow battery comprises: a bipolar plate; and a frame body provided at an outer periphery of the bipolar plate, the frame body including a manifold which penetrates through front and back surfaces of the frame body and through which an electrolyte flows, and at least one slit being formed on the front surface of the frame body and forming a channel of the electrolyte between the manifold and the bipolar plate, a cross sectional shape of the slit, in a longitudinal direction of the slit, having a width w and a depth h, the width w and the depth h satisfying (A) w&#x2265;3 mm and (B) 1/8&#x3c;h/w&#x3c;1.

Cell frame for redox flow battery, cell stack for redox flow battery, and redox flow battery

A frame body for a redox flow battery is provided with a window. The expressions A&#x3e;C, B&#x3e;D, and (B/A)&#x2265;0.2 are satisfied, where A represents the length of a long side of a rectangle that envelops the window, B represents the width of a horizontal frame corresponding to the long side, C represents the length of a short side of the rectangle, and D represents the width of a vertical frame corresponding to the short side.

Growing community of inventors

Osaka, Japan

Hideyuki Yamaguchi