Metal-halogen flow battery cell, stack, system, and method, the stack including flow battery cells that each include an impermeable first electrode, an insert disposed on the first electrode and comprising sloped channels, a cell frame disposed around the insert and including a cell inlet manifold configured to provide a metal halide electrolyte and an opposing cell outlet manifold configured to receive the electrolyte, a porous second electrode disposed on the insert, such that sloped separation zones are formed between the second electrode and the channels, conductive connectors electrically connecting the first and second electrodes, and ribs disposed on the second electrode and extending substantially parallel to the channels of the insert. A depth of the channels increases as proximity to the cell outlet manifold increases.

A stepped UEA for a fuel cell includes a major diffusion layer, a minor diffusion layer, an overmolded subgasket, and a proton exchange membrane layer disposed between the major diffusion layer and the minor diffusion layer. The overmolded subgasket may be directly molded to the peripheral edge region for each of the major diffusion layer, the minor diffusion layer, and the proton exchange membrane layer.

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) w3 mm and (B) 1/8<h/w<1.

In order to improve the production of bipolar plates (2), as are used, for example, for fuel cells, a device (1) is provided, which has two fixed laser scanners (5) at a processing station (3, 4), which are configured for the preferably fluid-tight welding of individual plates (6) of a bipolar plate (2) to be produced.

A description is given of a fuel cell comprising an electrode-membrane unit comprising a cathode and an anode, a cathodal gas diffusion element, an anodal gas diffusion element, the electrode-membrane unit being accommodated between the gas diffusion elements; a cathodal bipolar plate, and an anodal bipolar plate. Provision is made here for the cathodal gas diffusion element or/and the anodal gas diffusion element to have at least one structural element facing the respective bipolar plate and integrally bonded to the relevant gas diffusion element.

The present disclosure relates to a production system for producing at least one electrochemical system that comprises a stack consisting of a plurality of different components which are stacked one above the other along a stacking axis of the stack, with a height dimension of each component extending along the stacking axis where the production system allows the target height of the stack to be achieved in spite of the height tolerances of the different components.

A method for preparation of electrolyte for a redox flow battery includes reducing chromium ore using a carbon source to convert the chromium ore to an iron/chromium alloy with carbon particles; dissolving the iron/chromium alloy with carbon particles in sulfuric acid to form a first solution; adding calcium chloride or barium chloride to the first solution to produce a second solution including FeCl.sub.3 and CrCl.sub.3; and adding an acid to the second solution to form the electrolyte. Other methods can be used for preparing an electrolyte from chromium waste material.

Systems and methods are provided for an electrode assembly. In one example, the electrode assembly includes a bipolar plate and a negative electrode spacer fixedly coupled to a surface of the bipolar plate. The negative electrode spacer may comprise an array of discrete structures protruding from the surface of the bipolar plate.

A method is provided for producing a membrane electrode unit, provided with a peripheral seal and a peripheral sealing frame for an electrochemical cell, comprising the steps of: (A) producing a sandwich-like arrangement, forming the membrane electrode unit, from a membrane and two gas diffusion electrodes, (B) connecting the sandwich-like arrangement to a seal that extends around said electrodes at the lateral outer edge thereof, said seal at the same time establishing the connection to the sealing frame that extends laterally around the membrane electrode unit.

The present invention relates to a process for the manufacture of a bipolar plate composition. The invention also relates to processes for the manufacture of bipolar plates by injection, extrusion or compression, starting from said composition, and also to the bipolar plates obtained by these processes.