Method of assembling a cell

A method of assembling an electrochemical cell comprising a plurality of anode plates (14) and a plurality of cathode plates (12), each plate (12, 14) comprising a layer of a respective ion insertion material bonded to a respective metal current collector, those plates not at the ends of the stack comprising such layers bonded to both major surfaces of the current collector, and each plate (12, 14) being of generally rectangular shape with a projecting tab (18, 16) integral with the current collector, the method comprising forming a stack of discrete, separate cathode plates (12) and discrete, separate anode plates (14) stacked alternately with a continuous separator/electrolyte layer (10) interleaved between successive plates (12, 14) so it forms a zigzag, and with the tabs (18, 16) projecting from the stack, the stack being formed by repeatedly placing one of the plates (12 or 14) on the stack, and then folding the separator/electrolyte layer (10) over it, and subsequently forming electrical connections between the tabs (18) on all the cathode plates (12) and. between the tabs (16) on all the anode plates (14).