Electrochemical energy storage cell

An electrochemical energy storage cell comprising:

• a. a cylindrical housing that encloses an interior space and has a top side and an underside and a circumferential housing casing in between,
• b. the housing casing has an inner housing lateral surface that delimits the interior to the outside,
• c. a wound composite body shaped in a hollow cylindrical manner is arranged in the interior space and has a helical structure comprising at least two electrode strips helically wound around a winding axis and at least one separator strip arranged between the electrode strips,
• d. the electrode strips each comprise a strip-shaped current collector having an active material coating on both sides,
• e. the wound composite body shaped in a hollow cylindrical manner comprises two terminal end faces, a circumferential outer composite body lateral surface and a circumferential inner composite body lateral surface,
• f. the inner composite body lateral surface defines an axially oriented cavity in the center of the wound composite body,
• g. a winding core having a substantially cylindrical or hollow cylindrical shape is arranged in the axially oriented cavity and has an outer circumferential surface that rests flat on the inner composite body lateral surface, and
• h. the winding core has a local deviation from the cylindrical or hollow cylindrical shape in at least one region of the outer circumferential surface.