A method of forming a lead acid bipolar battery electrode having a peripheral sealing frame and relevant product

The method comprises the steps of: providing two complementary half-frames (12a, 12b) of plastic material each having a substantially flat face (13a, 13b) delimited by an outer closed line (14a, 14b) and an inner closed line (15a, 15b), where the inner and outer closed lines enclose the perimeter (16) of the plate (11); placing a plate (11) within a pressure forming mold between the two half-frames (12a, 12b) so as to enclose the perimeter (16) of the plate between the outer closed lines (14a, 14b) and the inner closed lines (15a, 15b); closing the mold and heating to a temperature causing the plastic material of the half-frames (12a, 12b) to fuse and adhere continuously to the plate along the entire perimeter (16) of the plate.