as discussed further below as the panels are formed from non conductive glass fibre cloths in these embodiments the cell structure needs to include current collector layers coated onto the cloth layers the final assembled structure of one of the li ion cells is shown in fig1 b the cell 1 is formed from two rectangular half cells 9 the cross section of said cells is depicted individually in fig1 a each half cell 9 is integrally deposited on a respective structural glass fibre cloth 3 and comprises an electrode layer 6 7 shielding layer 5 and current collector layer 4 in that order lying upon the glass cloth layer 3 the half cells 9 are provided with continuous raised rectangular adhesive frames 8 and an intermediate porous separator medium 2 is placed between them before they are bonded together to form the final cell at some stage a liquid electrolyte is permeated into the porous separator as shown by darker shading 2 u2032 in fig1 b this cell structure using half cells was selected as the most convenient for the prototype composite panel fig1 however shows an alternative cell structure that could be used where the entire cell has been laid up on only one cloth layer cell components that correspond to those of the fig1 b cell are numbered correspondingly this cell has the advantage that it does not contain the framed adhesive regions and underlying current collector borders reducing the.