NOVELTY - The lithium-ion energy store (1) has a counter-electrode main portion that is formed with respect to a separator (5) by facing the main portion (2) of the electrode, so that the portion of the separator is positioned between the main portion of the electrode and the counter-electrode main portion, while positioning the portion of separator between measuring section (3) of the electrode and counter-electrode measuring section. An adjustment device is adapted to together adjust the electric potential of the measuring section of the electrode and the electric potential of the main portion.    USE - Lithium ion energy store for use in electric vehicle.    ADVANTAGE - Since the adjustment device is adapted to together adjust electric potential of measuring section of electrode and electric potential of main portion of electrode, the electric potential of the measuring section and an electric potential of the main portion are brought into approximately the same potential, so that the performance of the lithium ion energy store is improved by maintaining the connection between the measuring section and main portion.    DETAILED DESCRIPTION - The lithium-ion energy store has an electrode which comprises a main portion, measuring section that is electrically separated from the main portion, a counter electrode (4), and a separator that is positioned between the electrode and the counter electrode. A counter-electrode measuring section is formed with respect to the separator by facing the measuring section of the electrode. An INDEPENDENT CLAIM is included for the method for adjusting the potentials of the measuring section of the electrode and main portion of the electrode of lithium ion energy store.    DESCRIPTION OF DRAWING(S) - The drawings show the schematic view of the lithium ion energy store, and the circuit diagrams of the lithium ion energy store.    Lithium ion energy store (1)    Main portion (2)    Measuring section (3)    Counter electrode (4)    Separator (5)