Single cell i.e. frame flat cell, for lithium ion battery in e.g. hybrid car, has electrode film whose boundary area forms holding lugs, where lugs of same positive polarity, strength and substance are connected with one another

The cell has electrode films with different polarities disconnected from each other by a separator film in an insulating manner. A boundary area of the respective electrode film forms a current arrestor tab. The current arrestor tabs with equal polarity is connected to an electrical conducting pole. The boundary area of the respective electrode film forms holding lugs on a free end of the electrode stack. The holding lugs of same positive polarity, strength and substance are connected with one another. An independent claim is also included for an accumulator comprising a heat guide plate at side wall elements.