Energy storage cell and production method

A method of producing an energy storage cell, the method comprising:

• providing an electrode-separator assembly comprising an anode, a cathode, and a separator having a sequence of anode/separator/cathode, wherein the electro-separator assembly is in a form of a cylindrical winding with two terminal end faces and a winding shell between the two terminal end faces, wherein the anode is in a band shape and comprises a band shaped anode current collector comprising a first longitudinal edge a second longitudinal edge and two end pieces, wherein the cathode is in a band shape and comprises a and shaped cathode current collector having a first longitudinal edge, a second longitudinal edge, and two end pieces, and wherein a first respective first longitudinal edge protrudes from a first respective terminal end face of the two terminal end faces of the cylindrical winding, the first respective first longitudinal edge being the first longitudinal edge of the anode current collector or the first longitudinal edge of the cathode current collector,
• providing a tubular housing portion with a terminal circular opening;
• providing an at least partly metallic contact element with a circular edge;
• applying an annular seal made of an electrically insulating material to the circular edge of the contact element;
• welding the first respective first longitudinal to the contact element or to a metallic component of the contact element,
• inserting the electrode-separator assembly through the terminal circular opening into the tubular housing portion such that the winding shell of the cylindrical winding adjoins, in a central section of the tabular housing portion, an inner side of the tubular housing portion and such that the annular seal applied to the circular edge of the contact element runs, in a contact section of the tubular housing portion along a circumferential contact zone on the inner side of the tubular housing portion, and
• exerting a radially directed pressure on the tubular housing portion, such that the inner side of the tubular housing portion is pressed against the circular edge of the contact element and the annular seal is subjected to a pressure and compressed,
• wherein the tubular housing portion comprises, in an axial direction, the central section, which is essentially cylindrical, a terminal section that extends up to a circular opening edge, and a transition region between the central section and the terminal section,
• wherein the transition region between the cylindrical central section and the terminal section includes a widening, in the form of a step, of the internal diameter of the tubular housing portion,
• wherein the contact element with the annular seal applied to the edge thereof has an external diameter less than an internal diameter of the tubular housing portion in the terminal section, and greater than the internal diameter of the tubular housing portion in the cylindrical central section, and
• wherein the electrode-separator assembly is inserted into the tubular housing portion to such an extent that the contact element rests on the widening in the form of the step.