Abstract: A manufacturing method of an intermediate product for a battery cell, includes winding a layer of a first electrode, a separator and a second electrode around a central longitudinal axis in a plurality of windings, creating a wound battery cell body. At least one of the first and the second electrode has a conductive portion extending at one front-end in a longitudinal direction The cell body is initially placed in an ultrasonic device so that a front-end of the cell body having the conductive portion faces a front-end working surface of a horn of the ultrasonic device. The cell body and the horn are moved relative to each other from the initial position to a working position in which the front-end working surface of the horn abuts the front-end of the cell body Ultrasonics are then at least partially applied to the conductive portion such that itis at least partially deformed by the horn and a worked cell body results.