c. The two conductor tracks or the two strip-like conductors or the two conductors with a round cross section are bent in opposite bending directions in the expansion section.
        d. The second contact lug is of O-shaped design in the expansion section or comprises a lower section designed in this way within the expansion section.
    
    
With preference, at least the features a. and b immediately above, preferably even the features a. to c. immediately above, particularly preferably even the features a. to d. immediately above, are implemented in combination with one another.
Further particularly preferably, the cell is additionally distinguished by at least one of the immediately following a. and b.:
    - 
    
        - a. The first contact lug comprises a contact section that can be angled away or is angled away from the plane of the planar section.
- b. The contact section of the first contact lug points in the same direction as the contact section of the second contact lug.
 
With preference, the features a. and b immediately above are implemented in combination with one another.
Further particularly preferably, the cell is additionally distinguished by at least one of the immediately following a. to c.:
    - 
    
        - a. The cell has a diameter of 5 mm to 50 mm, preferably 5 mm to 25 mm.
- b. The cell has a height of 3 mm to 50 mm.