A thin-plate-like flexible carbon plate having flexibility, excellent compressive strength, and even electrical conductivity is provided. A carbon plate 1 is a carbon plate having a thickness of 0.05 to 2.0 mm obtained by compression molding of a mixture of (a) 97 to 80 wt % carbon powder composed of 95 to 30 wt % expanded graphite powder and 5 to 70 wt % graphite powder, and (b) 3 to 20 wt % phenolic resin that do not contain ammonia, wherein a compressive strength is 3 MPa or more, a bending strain is 0.6% or more without a crack, and a contact resistance is 6 mΩ.Math.cm.sup.2 or less.

A thin-plate-like flexible carbon plate having flexibility, excellent compressive strength, and even electrical conductivity is provided. A carbon plate 1 is a carbon plate having a thickness of 0.05 to 2.0 mm obtained by compression molding of a mixture of (a) 97 to 80 wt % carbon powder composed of 95 to 30 wt % expanded graphite powder and 5 to 70 wt % graphite powder, and (b) 3 to 20 wt % phenolic resin that do not contain ammonia, wherein a compressive strength is 3 MPa or more, a bending strain is 0.6% or more without a crack, and a contact resistance is 6 mΩ.Math.cm.sup.2 or less.

A fuel cell separator obtained by: roughening the surface of a compact formed by molding a composition containing graphite powder, an epoxy resin, and a phenol resin; treating the compact with infrared laser irradiation; and then performing a hydrophilizing treatment, wherein a fuel cell separator is provided having the characteristics that (1) the initial static contact angle is no greater than 20°, and (2) after manufacture, the static contact angle after being stored in atmospheric air for 3000 hours is no greater than 30°. This fuel cell separator has high hydrophilicity, allowing water generated during the electrical generation of the fuel cell to be easily discharged, and the hydrophilicity is maintained over a long period of time.

A fuel cell separator obtained by: roughening the surface of a compact formed by molding a composition containing graphite powder, an epoxy resin, and a phenol resin; treating the compact with infrared laser irradiation; and then performing a hydrophilizing treatment, wherein a fuel cell separator is provided having the characteristics that (1) the initial static contact angle is no greater than 20°, and (2) after manufacture, the static contact angle after being stored in atmospheric air for 3000 hours is no greater than 30°. This fuel cell separator has high hydrophilicity, allowing water generated during the electrical generation of the fuel cell to be easily discharged, and the hydrophilicity is maintained over a long period of time.

The invention relates to a method for producing a composition comprising the steps of: melt-blending a fluorinated polymer, preferably a polyvinylidene fluoride polymer, with a first conductive filler so as to obtain a conductive fluorinated polymer; grinding to powder said conductive fluorinated polymer; mixing the powder of conductive fluorinated polymer with a second conductive filler. The invention also relates to a composition comprising a second conductive filler and particles of conductive fluorinated polymer, wherein the particles of conductive fluorinated polymer comprise a fluorinated polymer matrix in which a first conductive filler is dispersed The invention also relates to a method for producing a bipolar plate and to a bipolar plate.

Redox flow battery includes cell frame 20 including frame body 21 and bipolar plate 23, frame body 21 having rectangular opening 22 divided into a plurality of small openings 22a-22c along first direction X parallel to a longitudinal direction of opening 22, bipolar plate 23 divided into a plurality of regions 23a-23c, each of regions 23a-23c disposed within each of small openings 22a-22c to form a plurality of recesses, and electrode 11 divided into a plurality of regions 11a-11c, each of regions 11a-11c received in each of the recesses, wherein each of small openings 22a-22c has a rectangular shape whose longitudinal direction is parallel to first direction X.

Redox flow battery includes cell frame 20 including frame body 21 and bipolar plate 23, frame body 21 having rectangular opening 22 divided into a plurality of small openings 22a-22c along first direction X parallel to a longitudinal direction of opening 22, bipolar plate 23 divided into a plurality of regions 23a-23c, each of regions 23a-23c disposed within each of small openings 22a-22c to form a plurality of recesses, and electrode 11 divided into a plurality of regions 11a-11c, each of regions 11a-11c received in each of the recesses, wherein each of small openings 22a-22c has a rectangular shape whose longitudinal direction is parallel to first direction X.

A method for producing bipolar plates for fuel cells, one metal strip or two metal strips is/are guided through a second or third device. The second device is designed to carry out fine cleaning and/or nitriding of the metal strip, and the third device carries out surface coating on one side of a surface with a metal layer that improves adhesion. Applying a carbon layer in a fourth device. The metal strips are then shaped, during which process channels are formed. The shaped metal strips are moved and positioned such that surface regions come into contact with one another. Joining is performed with a laser beam, which is directed into a gap between the shaped metal strips moved towards one another. The individual steps in the devices, like shaping and joining, are carried out in a continuous process.

A method for producing bipolar plates for fuel cells, one metal strip or two metal strips is/are guided through a second or third device. The second device is designed to carry out fine cleaning and/or nitriding of the metal strip, and the third device carries out surface coating on one side of a surface with a metal layer that improves adhesion. Applying a carbon layer in a fourth device. The metal strips are then shaped, during which process channels are formed. The shaped metal strips are moved and positioned such that surface regions come into contact with one another. Joining is performed with a laser beam, which is directed into a gap between the shaped metal strips moved towards one another. The individual steps in the devices, like shaping and joining, are carried out in a continuous process.

The present invention provides a conductive metal resin multilayer body that comprises: a metal foil; and a resin layer which is arranged on at least one surface of the metal foil, and which contains a resin, organic fibers and a conductive filler that is formed of a non-metal material.