Automatic machine and related method for the production of windings starting from a strip of material suitable for the manufacture of electrical energy storage devices

Method for the production of windings (2) starting from at least one strip (3, 4) of material suitable for the manufacture of electrical energy storage devices, the method comprising the steps of:

• retaining a previously formed winding (2) having a central longitudinal axis (A), a longitudinal lateral surface (2a) and two axial end surfaces (2b) opposite to one another;
• feeding an electrically insulating tape (15) towards the retained winding (2);
• actuating in rotation the retained winding (2) about the longitudinal axis (A) thereof;
• progressively fastening, by means of the step of feeding and actuating in rotation, a first longitudinal portion (15a) of the insulating tape (15) to an axial end edge (2c) of the longitudinal lateral surface (2a) of the winding (2), so that a second longitudinal portion (15b) of the insulating tape (15), adjacent to the first longitudinal portion (15a), projects axially from said end edge (2c);
• and
• progressively refolding the second longitudinal portion (15b) onto the axial surface (2b) of the winding (2) adjacent to said end edge (2c).

Electrical energy storage device comprising:

• a winding (2) formed starting from at least one strip (3, 4) of material suitable for the manufacture of electrical energy storage devices;
• and
• a hollow container housing the winding (2);
• the winding (2) having a longitudinal central axis (A), a longitudinal lateral surface (2a) and two opposite axial surfaces (2b);
• wherein the storage device further comprises an electrically insulating tape (15) applied to an axial end of the winding (2),
• wherein a first longitudinal portion (15a) of the insulating tape (15) is fastened to the longitudinal lateral surface (2a) at an axial end edge (2c) of the longitudinal lateral surface (2a) itself;
• wherein a second longitudinal portion (15b) of the insulating tape (15), adjacent to the first longitudinal portion (15a), is refolded against the axial surface (2b) of the winding (2) adjacent to said end edge (2c).