Reference electrode of lithium ion battery, three-electrode battery and preparation method of three-electrode battery

The invention discloses a lithium ion battery reference electrode, a three-electrode battery and a preparation method of the three-electrode battery. Lithium is plated on the surface of one end, far away from a tab adhesive, of a copper tab to form a lithium-plated region, and an isolating membrane is arranged on the surface of the lithium-plated region; coating a high-temperature adhesive tape on the surface of a non-lithium-plated region between the tab glue and the lithium-plated region to obtain the reference electrode of the lithium ion battery; placing reference electrodes of the lithium ion battery on the outer sides of the positive plate and the negative plate; according to the lithium ion battery reference electrode, the three-electrode battery and the preparation method of the three-electrode battery, the overall operation is simple, the prepared lithium ion battery reference electrode does not affect conduction of lithium ions between a positive plate and a negative plate, the stability and accurac