Energy Development Associates

Electrocell Ab

Ake Bjareklint

Stephan Schwartz

Roland Soderstrom

Daniel Simonsson

Olle Ramstrom

An electrode chamber unit intended for use in an electrochemical cell including at least one porous percolating electrode in the form of a bed of electrically conductive particles, e.g. of graphite. The unit is distinguished in that it includes at least one substantially flat frame (3), preferably of a polymeric material, said frame defining a central opening (4) which is filled with the electrically conductive particles so as to form a porous bed (5), the particles being kept in place in the central opening of the frame by sufficiently dense separators (10), preferably made from a polymer material, which are arranged to cover the central opening on either side of the frame to form an electrode chamber, that the frame is provided with at least one hole (8) for supply and at least one hole (9) for discharge of electrolyte, where said holes are in communication via supply and discharge channels with the central opening of the frame, and that the frame includes current conductors (6,7) for supplying electric current to the conductive particles. An electrochemical cell including the above-mentioned units. A method of producing the cell by placing a separator (13) horizontally, applying at least one frame (3) on top of the separator, filling the central opening (4) of the frame with the particles of the electrically conductive material, placing the next separator (10) thereupon so as to keep the particles in place and repeating the procedure with the number of electrode chamber units which are to be included in the electrochemical cell, and locking the units to each other with conventional locking means (15,16). Use of the cell for purification of water.

Electrode chamber unit for an electro-chemical cell having a porous

A method of joining together a plurality of graphite members providing a low transition resistance is described. The method includes the steps of interposing a layer of a thermally sensitive material between the graphite members to be joined, applying pressure to force the graphite members together, applying sufficient heat to melt the thermally sensitive material, and releasing the pressure after providing a period of time for cooling. The thermally sensitive material is preferably composed from a thermoplastic material, and the heat for melting this material is preferably provided by resistance brazing.

Method for joining graphite to graphite

A method of joining two metal members to a graphite member to form a structure having a low transition resistance is described. The method includes the steps of providing a plurality of openings in the graphite member, interposing the graphite member between the two metal members and positioning the metal members to cover the openings in the graphite member, and resistance spot welding the metal members to the graphite member at the openings in the graphite member. This method is advantageous in forming a bus-bar connection between a pair of opposite polarity graphite electrodes in an electrochemical cell stack, such as a zinc-chloride battery. In this particular application, it is preferred that titanium be used for the metal members.

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Vallentuna, Sweden

Ake Bjareklint