Abstract: Apparatus for enveloping battery plates within porous separators and for feeding a separator sheet to form a fold at the approximate midpoint of the separator, simultaneously positioning a battery plate with an edge adjacent to the fold line, passing the plate and separator through rollers to press the separator against both sides of the battery plate, and passing the folded separator and enclosed battery plate through an ultrasonic sealing unit for sealing opposite edges of the separator to form an envelope. The apparatus includes a separator sheet dispenser for dispensing individual separator sheets into an elongated passageway. The end of the passageway is blocked so that a separator reaching the stopping point buckles to form a fold at the approximate midpoint of the separator.