Flexible flat cable connecting method and a horn construction of an ultrasonic welding machine

1. Field of the Invention A flexible flat cable connecting method includes stripping an insulation coating () surface of a flexible flat cable () to be connected with a busbar () to expose a conductive element (). The method continues by introducing the flexible flat cable () and the busbar () between a horn () and an anvil () of an ultrasonic welding machine (), and then transmitting an ultrasonic vibration to the horn (). The horn () has a plurality of elongated projections () of tapered cross-section pressed in contact with the insulation coating () of the flexible flat cable (). Thus, the elongated projections () bite into the insulation coating () to weld the conductive element () ultrasonically into the busbar ()