▎ 摘　　要

NOVELTY - The method involves uniformly dispersing (100) the active material and the conductive carbon material in a preparation solvent according to a preset ratio, and removing the preparation solvent, so that the conductive carbon material self-assembles into a conductive film. The active material is uniformly embedded in the inner layer structure of the conductive film to obtain a reference electrode material. The reference electrode material is cut (200). The cut reference electrode material is connected with conductive lugs to obtain a potential sensor. The thickness of the reference electrode material is regulated by controlling the addition amount of the conductive carbon material. The conductive lug is a metal lug. One end of the conductive lug is connected to one end of the cut reference electrode material through conductive gel. USE - Preparation method of potential sensor (claimed) for lithium-ion batteries used as main power source of electric vehicles. ADVANTAGE - The conductive carbon material is self-assembled into a conductive film, and the active material is evenly embedded in the inner layer structure of the conductive film to form an integrated potential sensor without a substrate and without a binder. The potential sensor does not need adhesives and base materials in the preparation process, the preparation process is simple, and the thickness of the sensor can be controlled by adjusting the amount of conductive carbon material added, and the impact on the battery itself is small after being implanted in the battery. The active material is not easy to fall off while ensuring good conductivity since the active material of the potential sensor is embedded in the conductive film and uniformly dispersed in the conductive film, and the side reaction between the active material and the electrolyte can be reduced. The potential sensor has a long service life, and can perform static and dynamic monitoring tests on the negative electrode potential of the battery for a long time. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a potential sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the preparation method of the potential sensor. (Drawing includes non-English language text) 100Step for uniformly dispersing the active material and the conductive carbon material in a preparation solvent 200Step for cutting the reference electrode material