Button cells and method of producing same

A rechargeable button cell comprising:

• housing half-parts comprising a housing cup and a housing top separated from one another by an electrically insulating injection-molded seal or film seal and which form a housing with a flat bottom area and a flat top area parallel to it, and
• an electrode-separator assembly within the housing comprising a positive and a negative electrode in the form of flat layers, and a porous plastic film arranged between the positive and negative electrodes,
• wherein
• at least one of the electrodes is a lithium-intercalating electrode,
• the electrode layers are aligned essentially at right angles to the flat bottom and the flat top areas and the electrode-separator assembly is a spiral winding having end faces defining side surfaces of the spiral winding facing in an axial direction relative to the flat bottom area and the flat top area,
• the electrodes each comprise a metallic film or mesh embedded in a respective electrode material as a current collector,
• at least one of the current collectors acts as an output conductor that connects one of the electrodes to one of the flat bottom or flat top areas of the housing, wherein sub-areas of the current collector(s) not covered with the electrode material can be brought into contact with the button cell housing, or the button cell comprises at least one separate output conductor welded to the housing and to one of the current collectors and which connects one of the electrodes to one of the flat bottom or top areas,
• one of the electrodes connects to the flat bottom area or the flat top area via an output conductor in the form of a thin film resting flat between a plane defined by an end face of the spiral winding and the flat top or the flat bottom area to which it is connected, and
• at least one insulating means preventing direct mechanical and electrical contact between at least one end face of the winding and the flat bottom and/or flat top area.